---
drivers/staging/Kconfig | 4 -
drivers/staging/Makefile | 2 -
drivers/staging/ramster/Kconfig | 13 -
drivers/staging/ramster/Makefile | 1 -
drivers/staging/ramster/TODO | 13 -
drivers/staging/ramster/cluster/Makefile | 3 -
drivers/staging/ramster/cluster/heartbeat.c | 464 ---
drivers/staging/ramster/cluster/heartbeat.h | 87 -
drivers/staging/ramster/cluster/masklog.c | 155 -
drivers/staging/ramster/cluster/masklog.h | 220 --
drivers/staging/ramster/cluster/nodemanager.c | 992 ------
drivers/staging/ramster/cluster/nodemanager.h | 88 -
.../staging/ramster/cluster/ramster_nodemanager.h | 39 -
drivers/staging/ramster/cluster/tcp.c | 2256 -------------
drivers/staging/ramster/cluster/tcp.h | 159 -
drivers/staging/ramster/cluster/tcp_internal.h | 248 --
drivers/staging/ramster/r2net.c | 401 ---
drivers/staging/ramster/ramster.h | 118 -
drivers/staging/ramster/tmem.c | 851 -----
drivers/staging/ramster/tmem.h | 244 --
drivers/staging/ramster/xvmalloc.c | 509 ---
drivers/staging/ramster/xvmalloc.h | 30 -
drivers/staging/ramster/xvmalloc_int.h | 95 -
drivers/staging/ramster/zcache-main.c | 3320 --------------------
drivers/staging/ramster/zcache.h | 22 -
drivers/staging/zcache/Kconfig | 14 -
drivers/staging/zcache/Makefile | 3 -
drivers/staging/zcache/tmem.c | 770 -----
drivers/staging/zcache/tmem.h | 206 --
drivers/staging/zcache/zcache-main.c | 2084 ------------
30 files changed, 0 insertions(+), 13411 deletions(-)
delete mode 100644 drivers/staging/ramster/Kconfig
delete mode 100644 drivers/staging/ramster/Makefile
delete mode 100644 drivers/staging/ramster/TODO
delete mode 100644 drivers/staging/ramster/cluster/Makefile
delete mode 100644 drivers/staging/ramster/cluster/heartbeat.c
delete mode 100644 drivers/staging/ramster/cluster/heartbeat.h
delete mode 100644 drivers/staging/ramster/cluster/masklog.c
delete mode 100644 drivers/staging/ramster/cluster/masklog.h
delete mode 100644 drivers/staging/ramster/cluster/nodemanager.c
delete mode 100644 drivers/staging/ramster/cluster/nodemanager.h
delete mode 100644 drivers/staging/ramster/cluster/ramster_nodemanager.h
delete mode 100644 drivers/staging/ramster/cluster/tcp.c
delete mode 100644 drivers/staging/ramster/cluster/tcp.h
delete mode 100644 drivers/staging/ramster/cluster/tcp_internal.h
delete mode 100644 drivers/staging/ramster/r2net.c
delete mode 100644 drivers/staging/ramster/ramster.h
delete mode 100644 drivers/staging/ramster/tmem.c
delete mode 100644 drivers/staging/ramster/tmem.h
delete mode 100644 drivers/staging/ramster/xvmalloc.c
delete mode 100644 drivers/staging/ramster/xvmalloc.h
delete mode 100644 drivers/staging/ramster/xvmalloc_int.h
delete mode 100644 drivers/staging/ramster/zcache-main.c
delete mode 100644 drivers/staging/ramster/zcache.h
delete mode 100644 drivers/staging/zcache/Kconfig
delete mode 100644 drivers/staging/zcache/Makefile
delete mode 100644 drivers/staging/zcache/tmem.c
delete mode 100644 drivers/staging/zcache/tmem.h
delete mode 100644 drivers/staging/zcache/zcache-main.c
diff --git a/drivers/staging/Kconfig b/drivers/staging/Kconfig
index 05e33c7..ff8870b 100644
--- a/drivers/staging/Kconfig
+++ b/drivers/staging/Kconfig
@@ -76,8 +76,6 @@ source "drivers/staging/iio/Kconfig"
source "drivers/staging/zram/Kconfig"
-source "drivers/staging/zcache/Kconfig"
-
source "drivers/staging/zsmalloc/Kconfig"
source "drivers/staging/wlags49_h2/Kconfig"
@@ -122,8 +120,6 @@ source "drivers/staging/android/Kconfig"
source "drivers/staging/telephony/Kconfig"
-source "drivers/staging/ramster/Kconfig"
-
source "drivers/staging/ozwpan/Kconfig"
source "drivers/staging/ccg/Kconfig"
diff --git a/drivers/staging/Makefile b/drivers/staging/Makefile
index a987b3a..c03bf4a 100644
--- a/drivers/staging/Makefile
+++ b/drivers/staging/Makefile
@@ -33,7 +33,6 @@ obj-$(CONFIG_IPACK_BUS) += ipack/
obj-$(CONFIG_DX_SEP) += sep/
obj-$(CONFIG_IIO) += iio/
obj-$(CONFIG_ZRAM) += zram/
-obj-$(CONFIG_ZCACHE) += zcache/
obj-$(CONFIG_ZSMALLOC) += zsmalloc/
obj-$(CONFIG_WLAGS49_H2) += wlags49_h2/
obj-$(CONFIG_WLAGS49_H25) += wlags49_h25/
@@ -54,7 +53,6 @@ obj-$(CONFIG_MFD_NVEC) += nvec/
obj-$(CONFIG_DRM_OMAP) += omapdrm/
obj-$(CONFIG_ANDROID) += android/
obj-$(CONFIG_PHONE) += telephony/
-obj-$(CONFIG_RAMSTER) += ramster/
obj-$(CONFIG_USB_WPAN_HCD) += ozwpan/
obj-$(CONFIG_USB_G_CCG) += ccg/
obj-$(CONFIG_WIMAX_GDM72XX) += gdm72xx/
diff --git a/drivers/staging/ramster/Kconfig b/drivers/staging/ramster/Kconfig
deleted file mode 100644
index 8349887..0000000
--- a/drivers/staging/ramster/Kconfig
+++ /dev/null
@@ -1,13 +0,0 @@
-config RAMSTER
- bool "Cross-machine RAM capacity sharing, aka peer-to-peer tmem"
- depends on (CLEANCACHE || FRONTSWAP) && CONFIGFS_FS=y && !ZCACHE && !XVMALLOC && !HIGHMEM && NET
- select LZO_COMPRESS
- select LZO_DECOMPRESS
- default n
- help
- RAMster allows RAM on other machines in a cluster to be utilized
- dynamically and symmetrically instead of swapping to a local swap
- disk, thus improving performance on memory-constrained workloads
- while minimizing total RAM across the cluster. RAMster, like
- zcache, compresses swap pages into local RAM, but then remotifies
- the compressed pages to another node in the RAMster cluster.
diff --git a/drivers/staging/ramster/Makefile b/drivers/staging/ramster/Makefile
deleted file mode 100644
index bcc13c8..0000000
--- a/drivers/staging/ramster/Makefile
+++ /dev/null
@@ -1 +0,0 @@
-obj-$(CONFIG_RAMSTER) += zcache-main.o tmem.o r2net.o xvmalloc.o cluster/
diff --git a/drivers/staging/ramster/TODO b/drivers/staging/ramster/TODO
deleted file mode 100644
index 46fcf0c..0000000
--- a/drivers/staging/ramster/TODO
+++ /dev/null
@@ -1,13 +0,0 @@
-For this staging driver, RAMster duplicates code from drivers/staging/zcache
-then incorporates changes to the local copy of the code. For V5, it also
-directly incorporates the soon-to-be-removed drivers/staging/zram/xvmalloc.[ch]
-as all testing has been done with xvmalloc rather than the new zsmalloc.
-Before RAMster can be promoted from staging, the zcache and RAMster drivers
-should be either merged or reorganized to separate out common code.
-
-Until V4, RAMster duplicated code from fs/ocfs2/cluster, but this made
-RAMster incompatible with ocfs2 running in the same kernel and included
-lots of code that could be removed. As of V5, the ocfs2 code has been
-mined and made RAMster-specific, made to communicate with a userland
-ramster-tools package rather than ocfs2-tools, and can co-exist with ocfs2
-both in the same kernel and in userland on the same machine.
diff --git a/drivers/staging/ramster/cluster/Makefile b/drivers/staging/ramster/cluster/Makefile
deleted file mode 100644
index 9c69436..0000000
--- a/drivers/staging/ramster/cluster/Makefile
+++ /dev/null
@@ -1,3 +0,0 @@
-obj-$(CONFIG_RAMSTER) += ramster_nodemanager.o
-
-ramster_nodemanager-objs := heartbeat.o masklog.o nodemanager.o tcp.o
diff --git a/drivers/staging/ramster/cluster/heartbeat.c b/drivers/staging/ramster/cluster/heartbeat.c
deleted file mode 100644
index 0020949..0000000
--- a/drivers/staging/ramster/cluster/heartbeat.c
+++ /dev/null
@@ -1,464 +0,0 @@
-/* -*- mode: c; c-basic-offset: 8; -*-
- * vim: noexpandtab sw=8 ts=8 sts=0:
- *
- * Copyright (C) 2004, 2005, 2012 Oracle. All rights reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public
- * License along with this program; if not, write to the
- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 021110-1307, USA.
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/configfs.h>
-
-#include "heartbeat.h"
-#include "tcp.h"
-#include "nodemanager.h"
-
-#include "masklog.h"
-
-/*
- * The first heartbeat pass had one global thread that would serialize all hb
- * callback calls. This global serializing sem should only be removed once
- * we've made sure that all callees can deal with being called concurrently
- * from multiple hb region threads.
- */
-static DECLARE_RWSEM(r2hb_callback_sem);
-
-/*
- * multiple hb threads are watching multiple regions. A node is live
- * whenever any of the threads sees activity from the node in its region.
- */
-static DEFINE_SPINLOCK(r2hb_live_lock);
-static unsigned long r2hb_live_node_bitmap[BITS_TO_LONGS(R2NM_MAX_NODES)];
-
-static struct r2hb_callback {
- struct list_head list;
-} r2hb_callbacks[R2HB_NUM_CB];
-
-enum r2hb_heartbeat_modes {
- R2HB_HEARTBEAT_LOCAL = 0,
- R2HB_HEARTBEAT_GLOBAL,
- R2HB_HEARTBEAT_NUM_MODES,
-};
-
-char *r2hb_heartbeat_mode_desc[R2HB_HEARTBEAT_NUM_MODES] = {
- "local", /* R2HB_HEARTBEAT_LOCAL */
- "global", /* R2HB_HEARTBEAT_GLOBAL */
-};
-
-unsigned int r2hb_dead_threshold = R2HB_DEFAULT_DEAD_THRESHOLD;
-unsigned int r2hb_heartbeat_mode = R2HB_HEARTBEAT_LOCAL;
-
-/* Only sets a new threshold if there are no active regions.
- *
- * No locking or otherwise interesting code is required for reading
- * r2hb_dead_threshold as it can't change once regions are active and
- * it's not interesting to anyone until then anyway. */
-static void r2hb_dead_threshold_set(unsigned int threshold)
-{
- if (threshold > R2HB_MIN_DEAD_THRESHOLD) {
- spin_lock(&r2hb_live_lock);
- r2hb_dead_threshold = threshold;
- spin_unlock(&r2hb_live_lock);
- }
-}
-
-static int r2hb_global_hearbeat_mode_set(unsigned int hb_mode)
-{
- int ret = -1;
-
- if (hb_mode < R2HB_HEARTBEAT_NUM_MODES) {
- spin_lock(&r2hb_live_lock);
- r2hb_heartbeat_mode = hb_mode;
- ret = 0;
- spin_unlock(&r2hb_live_lock);
- }
-
- return ret;
-}
-
-void r2hb_exit(void)
-{
-}
-
-int r2hb_init(void)
-{
- int i;
-
- for (i = 0; i < ARRAY_SIZE(r2hb_callbacks); i++)
- INIT_LIST_HEAD(&r2hb_callbacks[i].list);
-
- memset(r2hb_live_node_bitmap, 0, sizeof(r2hb_live_node_bitmap));
-
- return 0;
-}
-
-/* if we're already in a callback then we're already serialized by the sem */
-static void r2hb_fill_node_map_from_callback(unsigned long *map,
- unsigned bytes)
-{
- BUG_ON(bytes < (BITS_TO_LONGS(R2NM_MAX_NODES) * sizeof(unsigned long)));
-
- memcpy(map, &r2hb_live_node_bitmap, bytes);
-}
-
-/*
- * get a map of all nodes that are heartbeating in any regions
- */
-void r2hb_fill_node_map(unsigned long *map, unsigned bytes)
-{
- /* callers want to serialize this map and callbacks so that they
- * can trust that they don't miss nodes coming to the party */
- down_read(&r2hb_callback_sem);
- spin_lock(&r2hb_live_lock);
- r2hb_fill_node_map_from_callback(map, bytes);
- spin_unlock(&r2hb_live_lock);
- up_read(&r2hb_callback_sem);
-}
-EXPORT_SYMBOL_GPL(r2hb_fill_node_map);
-
-/*
- * heartbeat configfs bits. The heartbeat set is a default set under
- * the cluster set in nodemanager.c.
- */
-
-/* heartbeat set */
-
-struct r2hb_hb_group {
- struct config_group hs_group;
- /* some stuff? */
-};
-
-static struct r2hb_hb_group *to_r2hb_hb_group(struct config_group *group)
-{
- return group ?
- container_of(group, struct r2hb_hb_group, hs_group)
- : NULL;
-}
-
-static struct config_item r2hb_config_item;
-
-static struct config_item *r2hb_hb_group_make_item(struct config_group *group,
- const char *name)
-{
- int ret;
-
- if (strlen(name) > R2HB_MAX_REGION_NAME_LEN) {
- ret = -ENAMETOOLONG;
- goto free;
- }
-
- config_item_put(&r2hb_config_item);
-
- return &r2hb_config_item;
-free:
- return ERR_PTR(ret);
-}
-
-static void r2hb_hb_group_drop_item(struct config_group *group,
- struct config_item *item)
-{
- if (r2hb_global_heartbeat_active()) {
- printk(KERN_NOTICE "ramster: Heartbeat %s "
- "on region %s (%s)\n",
- "stopped/aborted", config_item_name(item),
- "no region");
- }
-
- config_item_put(item);
-}
-
-struct r2hb_hb_group_attribute {
- struct configfs_attribute attr;
- ssize_t (*show)(struct r2hb_hb_group *, char *);
- ssize_t (*store)(struct r2hb_hb_group *, const char *, size_t);
-};
-
-static ssize_t r2hb_hb_group_show(struct config_item *item,
- struct configfs_attribute *attr,
- char *page)
-{
- struct r2hb_hb_group *reg = to_r2hb_hb_group(to_config_group(item));
- struct r2hb_hb_group_attribute *r2hb_hb_group_attr =
- container_of(attr, struct r2hb_hb_group_attribute, attr);
- ssize_t ret = 0;
-
- if (r2hb_hb_group_attr->show)
- ret = r2hb_hb_group_attr->show(reg, page);
- return ret;
-}
-
-static ssize_t r2hb_hb_group_store(struct config_item *item,
- struct configfs_attribute *attr,
- const char *page, size_t count)
-{
- struct r2hb_hb_group *reg = to_r2hb_hb_group(to_config_group(item));
- struct r2hb_hb_group_attribute *r2hb_hb_group_attr =
- container_of(attr, struct r2hb_hb_group_attribute, attr);
- ssize_t ret = -EINVAL;
-
- if (r2hb_hb_group_attr->store)
- ret = r2hb_hb_group_attr->store(reg, page, count);
- return ret;
-}
-
-static ssize_t r2hb_hb_group_threshold_show(struct r2hb_hb_group *group,
- char *page)
-{
- return sprintf(page, "%u\n", r2hb_dead_threshold);
-}
-
-static ssize_t r2hb_hb_group_threshold_store(struct r2hb_hb_group *group,
- const char *page,
- size_t count)
-{
- unsigned long tmp;
- char *p = (char *)page;
- int err;
-
- err = kstrtoul(p, 10, &tmp);
- if (err)
- return err;
-
- /* this will validate ranges for us. */
- r2hb_dead_threshold_set((unsigned int) tmp);
-
- return count;
-}
-
-static
-ssize_t r2hb_hb_group_mode_show(struct r2hb_hb_group *group,
- char *page)
-{
- return sprintf(page, "%s\n",
- r2hb_heartbeat_mode_desc[r2hb_heartbeat_mode]);
-}
-
-static
-ssize_t r2hb_hb_group_mode_store(struct r2hb_hb_group *group,
- const char *page, size_t count)
-{
- unsigned int i;
- int ret;
- size_t len;
-
- len = (page[count - 1] == '\n') ? count - 1 : count;
- if (!len)
- return -EINVAL;
-
- for (i = 0; i < R2HB_HEARTBEAT_NUM_MODES; ++i) {
- if (strnicmp(page, r2hb_heartbeat_mode_desc[i], len))
- continue;
-
- ret = r2hb_global_hearbeat_mode_set(i);
- if (!ret)
- printk(KERN_NOTICE "ramster: Heartbeat mode "
- "set to %s\n",
- r2hb_heartbeat_mode_desc[i]);
- return count;
- }
-
- return -EINVAL;
-
-}
-
-static struct r2hb_hb_group_attribute r2hb_hb_group_attr_threshold = {
- .attr = { .ca_owner = THIS_MODULE,
- .ca_name = "dead_threshold",
- .ca_mode = S_IRUGO | S_IWUSR },
- .show = r2hb_hb_group_threshold_show,
- .store = r2hb_hb_group_threshold_store,
-};
-
-static struct r2hb_hb_group_attribute r2hb_hb_group_attr_mode = {
- .attr = { .ca_owner = THIS_MODULE,
- .ca_name = "mode",
- .ca_mode = S_IRUGO | S_IWUSR },
- .show = r2hb_hb_group_mode_show,
- .store = r2hb_hb_group_mode_store,
-};
-
-static struct configfs_attribute *r2hb_hb_group_attrs[] = {
- &r2hb_hb_group_attr_threshold.attr,
- &r2hb_hb_group_attr_mode.attr,
- NULL,
-};
-
-static struct configfs_item_operations r2hb_hearbeat_group_item_ops = {
- .show_attribute = r2hb_hb_group_show,
- .store_attribute = r2hb_hb_group_store,
-};
-
-static struct configfs_group_operations r2hb_hb_group_group_ops = {
- .make_item = r2hb_hb_group_make_item,
- .drop_item = r2hb_hb_group_drop_item,
-};
-
-static struct config_item_type r2hb_hb_group_type = {
- .ct_group_ops = &r2hb_hb_group_group_ops,
- .ct_item_ops = &r2hb_hearbeat_group_item_ops,
- .ct_attrs = r2hb_hb_group_attrs,
- .ct_owner = THIS_MODULE,
-};
-
-/* this is just here to avoid touching group in heartbeat.h which the
- * entire damn world #includes */
-struct config_group *r2hb_alloc_hb_set(void)
-{
- struct r2hb_hb_group *hs = NULL;
- struct config_group *ret = NULL;
-
- hs = kzalloc(sizeof(struct r2hb_hb_group), GFP_KERNEL);
- if (hs == NULL)
- goto out;
-
- config_group_init_type_name(&hs->hs_group, "heartbeat",
- &r2hb_hb_group_type);
-
- ret = &hs->hs_group;
-out:
- if (ret == NULL)
- kfree(hs);
- return ret;
-}
-
-void r2hb_free_hb_set(struct config_group *group)
-{
- struct r2hb_hb_group *hs = to_r2hb_hb_group(group);
- kfree(hs);
-}
-
-/* hb callback registration and issuing */
-
-static struct r2hb_callback *hbcall_from_type(enum r2hb_callback_type type)
-{
- if (type == R2HB_NUM_CB)
- return ERR_PTR(-EINVAL);
-
- return &r2hb_callbacks[type];
-}
-
-void r2hb_setup_callback(struct r2hb_callback_func *hc,
- enum r2hb_callback_type type,
- r2hb_cb_func *func,
- void *data,
- int priority)
-{
- INIT_LIST_HEAD(&hc->hc_item);
- hc->hc_func = func;
- hc->hc_data = data;
- hc->hc_priority = priority;
- hc->hc_type = type;
- hc->hc_magic = R2HB_CB_MAGIC;
-}
-EXPORT_SYMBOL_GPL(r2hb_setup_callback);
-
-int r2hb_register_callback(const char *region_uuid,
- struct r2hb_callback_func *hc)
-{
- struct r2hb_callback_func *tmp;
- struct list_head *iter;
- struct r2hb_callback *hbcall;
- int ret;
-
- BUG_ON(hc->hc_magic != R2HB_CB_MAGIC);
- BUG_ON(!list_empty(&hc->hc_item));
-
- hbcall = hbcall_from_type(hc->hc_type);
- if (IS_ERR(hbcall)) {
- ret = PTR_ERR(hbcall);
- goto out;
- }
-
- down_write(&r2hb_callback_sem);
-
- list_for_each(iter, &hbcall->list) {
- tmp = list_entry(iter, struct r2hb_callback_func, hc_item);
- if (hc->hc_priority < tmp->hc_priority) {
- list_add_tail(&hc->hc_item, iter);
- break;
- }
- }
- if (list_empty(&hc->hc_item))
- list_add_tail(&hc->hc_item, &hbcall->list);
-
- up_write(&r2hb_callback_sem);
- ret = 0;
-out:
- mlog(ML_CLUSTER, "returning %d on behalf of %p for funcs %p\n",
- ret, __builtin_return_address(0), hc);
- return ret;
-}
-EXPORT_SYMBOL_GPL(r2hb_register_callback);
-
-void r2hb_unregister_callback(const char *region_uuid,
- struct r2hb_callback_func *hc)
-{
- BUG_ON(hc->hc_magic != R2HB_CB_MAGIC);
-
- mlog(ML_CLUSTER, "on behalf of %p for funcs %p\n",
- __builtin_return_address(0), hc);
-
- /* XXX Can this happen _with_ a region reference? */
- if (list_empty(&hc->hc_item))
- return;
-
- down_write(&r2hb_callback_sem);
-
- list_del_init(&hc->hc_item);
-
- up_write(&r2hb_callback_sem);
-}
-EXPORT_SYMBOL_GPL(r2hb_unregister_callback);
-
-int r2hb_check_node_heartbeating_from_callback(u8 node_num)
-{
- unsigned long testing_map[BITS_TO_LONGS(R2NM_MAX_NODES)];
-
- r2hb_fill_node_map_from_callback(testing_map, sizeof(testing_map));
- if (!test_bit(node_num, testing_map)) {
- mlog(ML_HEARTBEAT,
- "node (%u) does not have heartbeating enabled.\n",
- node_num);
- return 0;
- }
-
- return 1;
-}
-EXPORT_SYMBOL_GPL(r2hb_check_node_heartbeating_from_callback);
-
-void r2hb_stop_all_regions(void)
-{
-}
-EXPORT_SYMBOL_GPL(r2hb_stop_all_regions);
-
-/*
- * this is just a hack until we get the plumbing which flips file systems
- * read only and drops the hb ref instead of killing the node dead.
- */
-int r2hb_global_heartbeat_active(void)
-{
- return (r2hb_heartbeat_mode == R2HB_HEARTBEAT_GLOBAL);
-}
-EXPORT_SYMBOL(r2hb_global_heartbeat_active);
-
-/* added for RAMster */
-void r2hb_manual_set_node_heartbeating(int node_num)
-{
- if (node_num < R2NM_MAX_NODES)
- set_bit(node_num, r2hb_live_node_bitmap);
-}
-EXPORT_SYMBOL(r2hb_manual_set_node_heartbeating);
diff --git a/drivers/staging/ramster/cluster/heartbeat.h b/drivers/staging/ramster/cluster/heartbeat.h
deleted file mode 100644
index 6cbc775..0000000
--- a/drivers/staging/ramster/cluster/heartbeat.h
+++ /dev/null
@@ -1,87 +0,0 @@
-/* -*- mode: c; c-basic-offset: 8; -*-
- * vim: noexpandtab sw=8 ts=8 sts=0:
- *
- * heartbeat.h
- *
- * Function prototypes
- *
- * Copyright (C) 2004 Oracle. All rights reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public
- * License along with this program; if not, write to the
- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 021110-1307, USA.
- *
- */
-
-#ifndef R2CLUSTER_HEARTBEAT_H
-#define R2CLUSTER_HEARTBEAT_H
-
-#define R2HB_REGION_TIMEOUT_MS 2000
-
-#define R2HB_MAX_REGION_NAME_LEN 32
-
-/* number of changes to be seen as live */
-#define R2HB_LIVE_THRESHOLD 2
-/* number of equal samples to be seen as dead */
-extern unsigned int r2hb_dead_threshold;
-#define R2HB_DEFAULT_DEAD_THRESHOLD 31
-/* Otherwise MAX_WRITE_TIMEOUT will be zero... */
-#define R2HB_MIN_DEAD_THRESHOLD 2
-#define R2HB_MAX_WRITE_TIMEOUT_MS \
- (R2HB_REGION_TIMEOUT_MS * (r2hb_dead_threshold - 1))
-
-#define R2HB_CB_MAGIC 0x51d1e4ec
-
-/* callback stuff */
-enum r2hb_callback_type {
- R2HB_NODE_DOWN_CB = 0,
- R2HB_NODE_UP_CB,
- R2HB_NUM_CB
-};
-
-struct r2nm_node;
-typedef void (r2hb_cb_func)(struct r2nm_node *, int, void *);
-
-struct r2hb_callback_func {
- u32 hc_magic;
- struct list_head hc_item;
- r2hb_cb_func *hc_func;
- void *hc_data;
- int hc_priority;
- enum r2hb_callback_type hc_type;
-};
-
-struct config_group *r2hb_alloc_hb_set(void);
-void r2hb_free_hb_set(struct config_group *group);
-
-void r2hb_setup_callback(struct r2hb_callback_func *hc,
- enum r2hb_callback_type type,
- r2hb_cb_func *func,
- void *data,
- int priority);
-int r2hb_register_callback(const char *region_uuid,
- struct r2hb_callback_func *hc);
-void r2hb_unregister_callback(const char *region_uuid,
- struct r2hb_callback_func *hc);
-void r2hb_fill_node_map(unsigned long *map,
- unsigned bytes);
-void r2hb_exit(void);
-int r2hb_init(void);
-int r2hb_check_node_heartbeating_from_callback(u8 node_num);
-void r2hb_stop_all_regions(void);
-int r2hb_get_all_regions(char *region_uuids, u8 numregions);
-int r2hb_global_heartbeat_active(void);
-void r2hb_manual_set_node_heartbeating(int);
-
-#endif /* R2CLUSTER_HEARTBEAT_H */
diff --git a/drivers/staging/ramster/cluster/masklog.c b/drivers/staging/ramster/cluster/masklog.c
deleted file mode 100644
index 1261d85..0000000
--- a/drivers/staging/ramster/cluster/masklog.c
+++ /dev/null
@@ -1,155 +0,0 @@
-/* -*- mode: c; c-basic-offset: 8; -*-
- * vim: noexpandtab sw=8 ts=8 sts=0:
- *
- * Copyright (C) 2004, 2005, 2012 Oracle. All rights reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public
- * License along with this program; if not, write to the
- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 021110-1307, USA.
- */
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/proc_fs.h>
-#include <linux/seq_file.h>
-#include <linux/string.h>
-#include <linux/uaccess.h>
-
-#include "masklog.h"
-
-struct mlog_bits r2_mlog_and_bits = MLOG_BITS_RHS(MLOG_INITIAL_AND_MASK);
-EXPORT_SYMBOL_GPL(r2_mlog_and_bits);
-struct mlog_bits r2_mlog_not_bits = MLOG_BITS_RHS(0);
-EXPORT_SYMBOL_GPL(r2_mlog_not_bits);
-
-static ssize_t mlog_mask_show(u64 mask, char *buf)
-{
- char *state;
-
- if (__mlog_test_u64(mask, r2_mlog_and_bits))
- state = "allow";
- else if (__mlog_test_u64(mask, r2_mlog_not_bits))
- state = "deny";
- else
- state = "off";
-
- return snprintf(buf, PAGE_SIZE, "%s\n", state);
-}
-
-static ssize_t mlog_mask_store(u64 mask, const char *buf, size_t count)
-{
- if (!strnicmp(buf, "allow", 5)) {
- __mlog_set_u64(mask, r2_mlog_and_bits);
- __mlog_clear_u64(mask, r2_mlog_not_bits);
- } else if (!strnicmp(buf, "deny", 4)) {
- __mlog_set_u64(mask, r2_mlog_not_bits);
- __mlog_clear_u64(mask, r2_mlog_and_bits);
- } else if (!strnicmp(buf, "off", 3)) {
- __mlog_clear_u64(mask, r2_mlog_not_bits);
- __mlog_clear_u64(mask, r2_mlog_and_bits);
- } else
- return -EINVAL;
-
- return count;
-}
-
-struct mlog_attribute {
- struct attribute attr;
- u64 mask;
-};
-
-#define to_mlog_attr(_attr) container_of(_attr, struct mlog_attribute, attr)
-
-#define define_mask(_name) { \
- .attr = { \
- .name = #_name, \
- .mode = S_IRUGO | S_IWUSR, \
- }, \
- .mask = ML_##_name, \
-}
-
-static struct mlog_attribute mlog_attrs[MLOG_MAX_BITS] = {
- define_mask(TCP),
- define_mask(MSG),
- define_mask(SOCKET),
- define_mask(HEARTBEAT),
- define_mask(HB_BIO),
- define_mask(DLMFS),
- define_mask(DLM),
- define_mask(DLM_DOMAIN),
- define_mask(DLM_THREAD),
- define_mask(DLM_MASTER),
- define_mask(DLM_RECOVERY),
- define_mask(DLM_GLUE),
- define_mask(VOTE),
- define_mask(CONN),
- define_mask(QUORUM),
- define_mask(BASTS),
- define_mask(CLUSTER),
- define_mask(ERROR),
- define_mask(NOTICE),
- define_mask(KTHREAD),
-};
-
-static struct attribute *mlog_attr_ptrs[MLOG_MAX_BITS] = {NULL, };
-
-static ssize_t mlog_show(struct kobject *obj, struct attribute *attr,
- char *buf)
-{
- struct mlog_attribute *mlog_attr = to_mlog_attr(attr);
-
- return mlog_mask_show(mlog_attr->mask, buf);
-}
-
-static ssize_t mlog_store(struct kobject *obj, struct attribute *attr,
- const char *buf, size_t count)
-{
- struct mlog_attribute *mlog_attr = to_mlog_attr(attr);
-
- return mlog_mask_store(mlog_attr->mask, buf, count);
-}
-
-static const struct sysfs_ops mlog_attr_ops = {
- .show = mlog_show,
- .store = mlog_store,
-};
-
-static struct kobj_type mlog_ktype = {
- .default_attrs = mlog_attr_ptrs,
- .sysfs_ops = &mlog_attr_ops,
-};
-
-static struct kset mlog_kset = {
- .kobj = {.ktype = &mlog_ktype},
-};
-
-int r2_mlog_sys_init(struct kset *r2cb_kset)
-{
- int i = 0;
-
- while (mlog_attrs[i].attr.mode) {
- mlog_attr_ptrs[i] = &mlog_attrs[i].attr;
- i++;
- }
- mlog_attr_ptrs[i] = NULL;
-
- kobject_set_name(&mlog_kset.kobj, "logmask");
- mlog_kset.kobj.kset = r2cb_kset;
- return kset_register(&mlog_kset);
-}
-
-void r2_mlog_sys_shutdown(void)
-{
- kset_unregister(&mlog_kset);
-}
diff --git a/drivers/staging/ramster/cluster/masklog.h b/drivers/staging/ramster/cluster/masklog.h
deleted file mode 100644
index 918ae11..0000000
--- a/drivers/staging/ramster/cluster/masklog.h
+++ /dev/null
@@ -1,220 +0,0 @@
-/* -*- mode: c; c-basic-offset: 8; -*-
- * vim: noexpandtab sw=8 ts=8 sts=0:
- *
- * Copyright (C) 2005, 2012 Oracle. All rights reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public
- * License along with this program; if not, write to the
- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 021110-1307, USA.
- */
-
-#ifndef R2CLUSTER_MASKLOG_H
-#define R2CLUSTER_MASKLOG_H
-
-/*
- * For now this is a trivial wrapper around printk() that gives the critical
- * ability to enable sets of debugging output at run-time. In the future this
- * will almost certainly be redirected to relayfs so that it can pay a
- * substantially lower heisenberg tax.
- *
- * Callers associate the message with a bitmask and a global bitmask is
- * maintained with help from /proc. If any of the bits match the message is
- * output.
- *
- * We must have efficient bit tests on i386 and it seems gcc still emits crazy
- * code for the 64bit compare. It emits very good code for the dual unsigned
- * long tests, though, completely avoiding tests that can never pass if the
- * caller gives a constant bitmask that fills one of the longs with all 0s. So
- * the desire is to have almost all of the calls decided on by comparing just
- * one of the longs. This leads to having infrequently given bits that are
- * frequently matched in the high bits.
- *
- * _ERROR and _NOTICE are used for messages that always go to the console and
- * have appropriate KERN_ prefixes. We wrap these in our function instead of
- * just calling printk() so that this can eventually make its way through
- * relayfs along with the debugging messages. Everything else gets KERN_DEBUG.
- * The inline tests and macro dance give GCC the opportunity to quite cleverly
- * only emit the appropriage printk() when the caller passes in a constant
- * mask, as is almost always the case.
- *
- * All this bitmask nonsense is managed from the files under
- * /sys/fs/r2cb/logmask/. Reading the files gives a straightforward
- * indication of which bits are allowed (allow) or denied (off/deny).
- * ENTRY deny
- * EXIT deny
- * TCP off
- * MSG off
- * SOCKET off
- * ERROR allow
- * NOTICE allow
- *
- * Writing changes the state of a given bit and requires a strictly formatted
- * single write() call:
- *
- * write(fd, "allow", 5);
- *
- * Echoing allow/deny/off string into the logmask files can flip the bits
- * on or off as expected; here is the bash script for example:
- *
- * log_mask="/sys/fs/r2cb/log_mask"
- * for node in ENTRY EXIT TCP MSG SOCKET ERROR NOTICE; do
- * echo allow >"$log_mask"/"$node"
- * done
- *
- * The debugfs.ramster tool can also flip the bits with the -l option:
- *
- * debugfs.ramster -l TCP allow
- */
-
-/* for task_struct */
-#include <linux/sched.h>
-
-/* bits that are frequently given and infrequently matched in the low word */
-/* NOTE: If you add a flag, you need to also update masklog.c! */
-#define ML_TCP 0x0000000000000001ULL /* net cluster/tcp.c */
-#define ML_MSG 0x0000000000000002ULL /* net network messages */
-#define ML_SOCKET 0x0000000000000004ULL /* net socket lifetime */
-#define ML_HEARTBEAT 0x0000000000000008ULL /* hb all heartbeat tracking */
-#define ML_HB_BIO 0x0000000000000010ULL /* hb io tracing */
-#define ML_DLMFS 0x0000000000000020ULL /* dlm user dlmfs */
-#define ML_DLM 0x0000000000000040ULL /* dlm general debugging */
-#define ML_DLM_DOMAIN 0x0000000000000080ULL /* dlm domain debugging */
-#define ML_DLM_THREAD 0x0000000000000100ULL /* dlm domain thread */
-#define ML_DLM_MASTER 0x0000000000000200ULL /* dlm master functions */
-#define ML_DLM_RECOVERY 0x0000000000000400ULL /* dlm master functions */
-#define ML_DLM_GLUE 0x0000000000000800ULL /* ramster dlm glue layer */
-#define ML_VOTE 0x0000000000001000ULL /* ramster node messaging */
-#define ML_CONN 0x0000000000002000ULL /* net connection management */
-#define ML_QUORUM 0x0000000000004000ULL /* net connection quorum */
-#define ML_BASTS 0x0000000000008000ULL /* dlmglue asts and basts */
-#define ML_CLUSTER 0x0000000000010000ULL /* cluster stack */
-
-/* bits that are infrequently given and frequently matched in the high word */
-#define ML_ERROR 0x1000000000000000ULL /* sent to KERN_ERR */
-#define ML_NOTICE 0x2000000000000000ULL /* setn to KERN_NOTICE */
-#define ML_KTHREAD 0x4000000000000000ULL /* kernel thread activity */
-
-#define MLOG_INITIAL_AND_MASK (ML_ERROR|ML_NOTICE)
-#ifndef MLOG_MASK_PREFIX
-#define MLOG_MASK_PREFIX 0
-#endif
-
-/*
- * When logging is disabled, force the bit test to 0 for anything other
- * than errors and notices, allowing gcc to remove the code completely.
- * When enabled, allow all masks.
- */
-#if defined(CONFIG_RAMSTER_DEBUG_MASKLOG)
-#define ML_ALLOWED_BITS (~0)
-#else
-#define ML_ALLOWED_BITS (ML_ERROR|ML_NOTICE)
-#endif
-
-#define MLOG_MAX_BITS 64
-
-struct mlog_bits {
- unsigned long words[MLOG_MAX_BITS / BITS_PER_LONG];
-};
-
-extern struct mlog_bits r2_mlog_and_bits, r2_mlog_not_bits;
-
-#if BITS_PER_LONG == 32
-
-#define __mlog_test_u64(mask, bits) \
- ((u32)(mask & 0xffffffff) & bits.words[0] || \
- ((u64)(mask) >> 32) & bits.words[1])
-#define __mlog_set_u64(mask, bits) do { \
- bits.words[0] |= (u32)(mask & 0xffffffff); \
- bits.words[1] |= (u64)(mask) >> 32; \
-} while (0)
-#define __mlog_clear_u64(mask, bits) do { \
- bits.words[0] &= ~((u32)(mask & 0xffffffff)); \
- bits.words[1] &= ~((u64)(mask) >> 32); \
-} while (0)
-#define MLOG_BITS_RHS(mask) { \
- { \
- [0] = (u32)(mask & 0xffffffff), \
- [1] = (u64)(mask) >> 32, \
- } \
-}
-
-#else /* 32bit long above, 64bit long below */
-
-#define __mlog_test_u64(mask, bits) ((mask) & bits.words[0])
-#define __mlog_set_u64(mask, bits) do { \
- bits.words[0] |= (mask); \
-} while (0)
-#define __mlog_clear_u64(mask, bits) do { \
- bits.words[0] &= ~(mask); \
-} while (0)
-#define MLOG_BITS_RHS(mask) { { (mask) } }
-
-#endif
-
-/*
- * smp_processor_id() "helpfully" screams when called outside preemptible
- * regions in current kernels. sles doesn't have the variants that don't
- * scream. just do this instead of trying to guess which we're building
- * against.. *sigh*.
- */
-#define __mlog_cpu_guess ({ \
- unsigned long _cpu = get_cpu(); \
- put_cpu(); \
- _cpu; \
-})
-
-/* In the following two macros, the whitespace after the ',' just
- * before ##args is intentional. Otherwise, gcc 2.95 will eat the
- * previous token if args expands to nothing.
- */
-#define __mlog_printk(level, fmt, args...) \
- printk(level "(%s,%u,%lu):%s:%d " fmt, current->comm, \
- task_pid_nr(current), __mlog_cpu_guess, \
- __PRETTY_FUNCTION__, __LINE__ , ##args)
-
-#define mlog(mask, fmt, args...) do { \
- u64 __m = MLOG_MASK_PREFIX | (mask); \
- if ((__m & ML_ALLOWED_BITS) && \
- __mlog_test_u64(__m, r2_mlog_and_bits) && \
- !__mlog_test_u64(__m, r2_mlog_not_bits)) { \
- if (__m & ML_ERROR) \
- __mlog_printk(KERN_ERR, "ERROR: "fmt , ##args); \
- else if (__m & ML_NOTICE) \
- __mlog_printk(KERN_NOTICE, fmt , ##args); \
- else \
- __mlog_printk(KERN_INFO, fmt , ##args); \
- } \
-} while (0)
-
-#define mlog_errno(st) do { \
- int _st = (st); \
- if (_st != -ERESTARTSYS && _st != -EINTR && \
- _st != AOP_TRUNCATED_PAGE && _st != -ENOSPC) \
- mlog(ML_ERROR, "status = %lld\n", (long long)_st); \
-} while (0)
-
-#define mlog_bug_on_msg(cond, fmt, args...) do { \
- if (cond) { \
- mlog(ML_ERROR, "bug expression: " #cond "\n"); \
- mlog(ML_ERROR, fmt, ##args); \
- BUG(); \
- } \
-} while (0)
-
-#include <linux/kobject.h>
-#include <linux/sysfs.h>
-int r2_mlog_sys_init(struct kset *r2cb_subsys);
-void r2_mlog_sys_shutdown(void);
-
-#endif /* R2CLUSTER_MASKLOG_H */
diff --git a/drivers/staging/ramster/cluster/nodemanager.c b/drivers/staging/ramster/cluster/nodemanager.c
deleted file mode 100644
index de0e5c8..0000000
--- a/drivers/staging/ramster/cluster/nodemanager.c
+++ /dev/null
@@ -1,992 +0,0 @@
-/* -*- mode: c; c-basic-offset: 8; -*-
- * vim: noexpandtab sw=8 ts=8 sts=0:
- *
- * Copyright (C) 2004, 2005, 2012 Oracle. All rights reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public
- * License along with this program; if not, write to the
- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 021110-1307, USA.
- */
-
-#include <linux/slab.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/configfs.h>
-
-#include "tcp.h"
-#include "nodemanager.h"
-#include "heartbeat.h"
-#include "masklog.h"
-
-/* for now we operate under the assertion that there can be only one
- * cluster active at a time. Changing this will require trickling
- * cluster references throughout where nodes are looked up */
-struct r2nm_cluster *r2nm_single_cluster;
-
-char *r2nm_fence_method_desc[R2NM_FENCE_METHODS] = {
- "reset", /* R2NM_FENCE_RESET */
- "panic", /* R2NM_FENCE_PANIC */
-};
-
-struct r2nm_node *r2nm_get_node_by_num(u8 node_num)
-{
- struct r2nm_node *node = NULL;
-
- if (node_num >= R2NM_MAX_NODES || r2nm_single_cluster == NULL)
- goto out;
-
- read_lock(&r2nm_single_cluster->cl_nodes_lock);
- node = r2nm_single_cluster->cl_nodes[node_num];
- if (node)
- config_item_get(&node->nd_item);
- read_unlock(&r2nm_single_cluster->cl_nodes_lock);
-out:
- return node;
-}
-EXPORT_SYMBOL_GPL(r2nm_get_node_by_num);
-
-int r2nm_configured_node_map(unsigned long *map, unsigned bytes)
-{
- struct r2nm_cluster *cluster = r2nm_single_cluster;
-
- BUG_ON(bytes < (sizeof(cluster->cl_nodes_bitmap)));
-
- if (cluster == NULL)
- return -EINVAL;
-
- read_lock(&cluster->cl_nodes_lock);
- memcpy(map, cluster->cl_nodes_bitmap, sizeof(cluster->cl_nodes_bitmap));
- read_unlock(&cluster->cl_nodes_lock);
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(r2nm_configured_node_map);
-
-static struct r2nm_node *r2nm_node_ip_tree_lookup(struct r2nm_cluster *cluster,
- __be32 ip_needle,
- struct rb_node ***ret_p,
- struct rb_node **ret_parent)
-{
- struct rb_node **p = &cluster->cl_node_ip_tree.rb_node;
- struct rb_node *parent = NULL;
- struct r2nm_node *node, *ret = NULL;
-
- while (*p) {
- int cmp;
-
- parent = *p;
- node = rb_entry(parent, struct r2nm_node, nd_ip_node);
-
- cmp = memcmp(&ip_needle, &node->nd_ipv4_address,
- sizeof(ip_needle));
- if (cmp < 0)
- p = &(*p)->rb_left;
- else if (cmp > 0)
- p = &(*p)->rb_right;
- else {
- ret = node;
- break;
- }
- }
-
- if (ret_p != NULL)
- *ret_p = p;
- if (ret_parent != NULL)
- *ret_parent = parent;
-
- return ret;
-}
-
-struct r2nm_node *r2nm_get_node_by_ip(__be32 addr)
-{
- struct r2nm_node *node = NULL;
- struct r2nm_cluster *cluster = r2nm_single_cluster;
-
- if (cluster == NULL)
- goto out;
-
- read_lock(&cluster->cl_nodes_lock);
- node = r2nm_node_ip_tree_lookup(cluster, addr, NULL, NULL);
- if (node)
- config_item_get(&node->nd_item);
- read_unlock(&cluster->cl_nodes_lock);
-
-out:
- return node;
-}
-EXPORT_SYMBOL_GPL(r2nm_get_node_by_ip);
-
-void r2nm_node_put(struct r2nm_node *node)
-{
- config_item_put(&node->nd_item);
-}
-EXPORT_SYMBOL_GPL(r2nm_node_put);
-
-void r2nm_node_get(struct r2nm_node *node)
-{
- config_item_get(&node->nd_item);
-}
-EXPORT_SYMBOL_GPL(r2nm_node_get);
-
-u8 r2nm_this_node(void)
-{
- u8 node_num = R2NM_MAX_NODES;
-
- if (r2nm_single_cluster && r2nm_single_cluster->cl_has_local)
- node_num = r2nm_single_cluster->cl_local_node;
-
- return node_num;
-}
-EXPORT_SYMBOL_GPL(r2nm_this_node);
-
-/* node configfs bits */
-
-static struct r2nm_cluster *to_r2nm_cluster(struct config_item *item)
-{
- return item ?
- container_of(to_config_group(item), struct r2nm_cluster,
- cl_group)
- : NULL;
-}
-
-static struct r2nm_node *to_r2nm_node(struct config_item *item)
-{
- return item ? container_of(item, struct r2nm_node, nd_item) : NULL;
-}
-
-static void r2nm_node_release(struct config_item *item)
-{
- struct r2nm_node *node = to_r2nm_node(item);
- kfree(node);
-}
-
-static ssize_t r2nm_node_num_read(struct r2nm_node *node, char *page)
-{
- return sprintf(page, "%d\n", node->nd_num);
-}
-
-static struct r2nm_cluster *to_r2nm_cluster_from_node(struct r2nm_node *node)
-{
- /* through the first node_set .parent
- * mycluster/nodes/mynode == r2nm_cluster->r2nm_node_group->r2nm_node */
- return to_r2nm_cluster(node->nd_item.ci_parent->ci_parent);
-}
-
-enum {
- R2NM_NODE_ATTR_NUM = 0,
- R2NM_NODE_ATTR_PORT,
- R2NM_NODE_ATTR_ADDRESS,
- R2NM_NODE_ATTR_LOCAL,
-};
-
-static ssize_t r2nm_node_num_write(struct r2nm_node *node, const char *page,
- size_t count)
-{
- struct r2nm_cluster *cluster = to_r2nm_cluster_from_node(node);
- unsigned long tmp;
- char *p = (char *)page;
- int err;
-
- err = kstrtoul(p, 10, &tmp);
- if (err)
- return err;
-
- if (tmp >= R2NM_MAX_NODES)
- return -ERANGE;
-
- /* once we're in the cl_nodes tree networking can look us up by
- * node number and try to use our address and port attributes
- * to connect to this node.. make sure that they've been set
- * before writing the node attribute? */
- if (!test_bit(R2NM_NODE_ATTR_ADDRESS, &node->nd_set_attributes) ||
- !test_bit(R2NM_NODE_ATTR_PORT, &node->nd_set_attributes))
- return -EINVAL; /* XXX */
-
- write_lock(&cluster->cl_nodes_lock);
- if (cluster->cl_nodes[tmp])
- p = NULL;
- else {
- cluster->cl_nodes[tmp] = node;
- node->nd_num = tmp;
- set_bit(tmp, cluster->cl_nodes_bitmap);
- }
- write_unlock(&cluster->cl_nodes_lock);
- if (p == NULL)
- return -EEXIST;
-
- return count;
-}
-static ssize_t r2nm_node_ipv4_port_read(struct r2nm_node *node, char *page)
-{
- return sprintf(page, "%u\n", ntohs(node->nd_ipv4_port));
-}
-
-static ssize_t r2nm_node_ipv4_port_write(struct r2nm_node *node,
- const char *page, size_t count)
-{
- unsigned long tmp;
- char *p = (char *)page;
- int err;
-
- err = kstrtoul(p, 10, &tmp);
- if (err)
- return err;
-
- if (tmp == 0)
- return -EINVAL;
- if (tmp >= (u16)-1)
- return -ERANGE;
-
- node->nd_ipv4_port = htons(tmp);
-
- return count;
-}
-
-static ssize_t r2nm_node_ipv4_address_read(struct r2nm_node *node, char *page)
-{
- return sprintf(page, "%pI4\n", &node->nd_ipv4_address);
-}
-
-static ssize_t r2nm_node_ipv4_address_write(struct r2nm_node *node,
- const char *page,
- size_t count)
-{
- struct r2nm_cluster *cluster = to_r2nm_cluster_from_node(node);
- int ret, i;
- struct rb_node **p, *parent;
- unsigned int octets[4];
- __be32 ipv4_addr = 0;
-
- ret = sscanf(page, "%3u.%3u.%3u.%3u", &octets[3], &octets[2],
- &octets[1], &octets[0]);
- if (ret != 4)
- return -EINVAL;
-
- for (i = 0; i < ARRAY_SIZE(octets); i++) {
- if (octets[i] > 255)
- return -ERANGE;
- be32_add_cpu(&ipv4_addr, octets[i] << (i * 8));
- }
-
- ret = 0;
- write_lock(&cluster->cl_nodes_lock);
- if (r2nm_node_ip_tree_lookup(cluster, ipv4_addr, &p, &parent))
- ret = -EEXIST;
- else {
- rb_link_node(&node->nd_ip_node, parent, p);
- rb_insert_color(&node->nd_ip_node, &cluster->cl_node_ip_tree);
- }
- write_unlock(&cluster->cl_nodes_lock);
- if (ret)
- return ret;
-
- memcpy(&node->nd_ipv4_address, &ipv4_addr, sizeof(ipv4_addr));
-
- return count;
-}
-
-static ssize_t r2nm_node_local_read(struct r2nm_node *node, char *page)
-{
- return sprintf(page, "%d\n", node->nd_local);
-}
-
-static ssize_t r2nm_node_local_write(struct r2nm_node *node, const char *page,
- size_t count)
-{
- struct r2nm_cluster *cluster = to_r2nm_cluster_from_node(node);
- unsigned long tmp;
- char *p = (char *)page;
- ssize_t ret;
- int err;
-
- err = kstrtoul(p, 10, &tmp);
- if (err)
- return err;
-
- tmp = !!tmp; /* boolean of whether this node wants to be local */
-
- /* setting local turns on networking rx for now so we require having
- * set everything else first */
- if (!test_bit(R2NM_NODE_ATTR_ADDRESS, &node->nd_set_attributes) ||
- !test_bit(R2NM_NODE_ATTR_NUM, &node->nd_set_attributes) ||
- !test_bit(R2NM_NODE_ATTR_PORT, &node->nd_set_attributes))
- return -EINVAL; /* XXX */
-
- /* the only failure case is trying to set a new local node
- * when a different one is already set */
- if (tmp && tmp == cluster->cl_has_local &&
- cluster->cl_local_node != node->nd_num)
- return -EBUSY;
-
- /* bring up the rx thread if we're setting the new local node. */
- if (tmp && !cluster->cl_has_local) {
- ret = r2net_start_listening(node);
- if (ret)
- return ret;
- }
-
- if (!tmp && cluster->cl_has_local &&
- cluster->cl_local_node == node->nd_num) {
- r2net_stop_listening(node);
- cluster->cl_local_node = R2NM_INVALID_NODE_NUM;
- }
-
- node->nd_local = tmp;
- if (node->nd_local) {
- cluster->cl_has_local = tmp;
- cluster->cl_local_node = node->nd_num;
- }
-
- return count;
-}
-
-struct r2nm_node_attribute {
- struct configfs_attribute attr;
- ssize_t (*show)(struct r2nm_node *, char *);
- ssize_t (*store)(struct r2nm_node *, const char *, size_t);
-};
-
-static struct r2nm_node_attribute r2nm_node_attr_num = {
- .attr = { .ca_owner = THIS_MODULE,
- .ca_name = "num",
- .ca_mode = S_IRUGO | S_IWUSR },
- .show = r2nm_node_num_read,
- .store = r2nm_node_num_write,
-};
-
-static struct r2nm_node_attribute r2nm_node_attr_ipv4_port = {
- .attr = { .ca_owner = THIS_MODULE,
- .ca_name = "ipv4_port",
- .ca_mode = S_IRUGO | S_IWUSR },
- .show = r2nm_node_ipv4_port_read,
- .store = r2nm_node_ipv4_port_write,
-};
-
-static struct r2nm_node_attribute r2nm_node_attr_ipv4_address = {
- .attr = { .ca_owner = THIS_MODULE,
- .ca_name = "ipv4_address",
- .ca_mode = S_IRUGO | S_IWUSR },
- .show = r2nm_node_ipv4_address_read,
- .store = r2nm_node_ipv4_address_write,
-};
-
-static struct r2nm_node_attribute r2nm_node_attr_local = {
- .attr = { .ca_owner = THIS_MODULE,
- .ca_name = "local",
- .ca_mode = S_IRUGO | S_IWUSR },
- .show = r2nm_node_local_read,
- .store = r2nm_node_local_write,
-};
-
-static struct configfs_attribute *r2nm_node_attrs[] = {
- [R2NM_NODE_ATTR_NUM] = &r2nm_node_attr_num.attr,
- [R2NM_NODE_ATTR_PORT] = &r2nm_node_attr_ipv4_port.attr,
- [R2NM_NODE_ATTR_ADDRESS] = &r2nm_node_attr_ipv4_address.attr,
- [R2NM_NODE_ATTR_LOCAL] = &r2nm_node_attr_local.attr,
- NULL,
-};
-
-static int r2nm_attr_index(struct configfs_attribute *attr)
-{
- int i;
- for (i = 0; i < ARRAY_SIZE(r2nm_node_attrs); i++) {
- if (attr == r2nm_node_attrs[i])
- return i;
- }
- BUG();
- return 0;
-}
-
-static ssize_t r2nm_node_show(struct config_item *item,
- struct configfs_attribute *attr,
- char *page)
-{
- struct r2nm_node *node = to_r2nm_node(item);
- struct r2nm_node_attribute *r2nm_node_attr =
- container_of(attr, struct r2nm_node_attribute, attr);
- ssize_t ret = 0;
-
- if (r2nm_node_attr->show)
- ret = r2nm_node_attr->show(node, page);
- return ret;
-}
-
-static ssize_t r2nm_node_store(struct config_item *item,
- struct configfs_attribute *attr,
- const char *page, size_t count)
-{
- struct r2nm_node *node = to_r2nm_node(item);
- struct r2nm_node_attribute *r2nm_node_attr =
- container_of(attr, struct r2nm_node_attribute, attr);
- ssize_t ret;
- int attr_index = r2nm_attr_index(attr);
-
- if (r2nm_node_attr->store == NULL) {
- ret = -EINVAL;
- goto out;
- }
-
- if (test_bit(attr_index, &node->nd_set_attributes))
- return -EBUSY;
-
- ret = r2nm_node_attr->store(node, page, count);
- if (ret < count)
- goto out;
-
- set_bit(attr_index, &node->nd_set_attributes);
-out:
- return ret;
-}
-
-static struct configfs_item_operations r2nm_node_item_ops = {
- .release = r2nm_node_release,
- .show_attribute = r2nm_node_show,
- .store_attribute = r2nm_node_store,
-};
-
-static struct config_item_type r2nm_node_type = {
- .ct_item_ops = &r2nm_node_item_ops,
- .ct_attrs = r2nm_node_attrs,
- .ct_owner = THIS_MODULE,
-};
-
-/* node set */
-
-struct r2nm_node_group {
- struct config_group ns_group;
- /* some stuff? */
-};
-
-#if 0
-static struct r2nm_node_group *to_r2nm_node_group(struct config_group *group)
-{
- return group ?
- container_of(group, struct r2nm_node_group, ns_group)
- : NULL;
-}
-#endif
-
-struct r2nm_cluster_attribute {
- struct configfs_attribute attr;
- ssize_t (*show)(struct r2nm_cluster *, char *);
- ssize_t (*store)(struct r2nm_cluster *, const char *, size_t);
-};
-
-static ssize_t r2nm_cluster_attr_write(const char *page, ssize_t count,
- unsigned int *val)
-{
- unsigned long tmp;
- char *p = (char *)page;
- int err;
-
- err = kstrtoul(p, 10, &tmp);
- if (err)
- return err;
-
- if (tmp == 0)
- return -EINVAL;
- if (tmp >= (u32)-1)
- return -ERANGE;
-
- *val = tmp;
-
- return count;
-}
-
-static ssize_t r2nm_cluster_attr_idle_timeout_ms_read(
- struct r2nm_cluster *cluster, char *page)
-{
- return sprintf(page, "%u\n", cluster->cl_idle_timeout_ms);
-}
-
-static ssize_t r2nm_cluster_attr_idle_timeout_ms_write(
- struct r2nm_cluster *cluster, const char *page, size_t count)
-{
- ssize_t ret;
- unsigned int val = 0;
-
- ret = r2nm_cluster_attr_write(page, count, &val);
-
- if (ret > 0) {
- if (cluster->cl_idle_timeout_ms != val
- && r2net_num_connected_peers()) {
- mlog(ML_NOTICE,
- "r2net: cannot change idle timeout after "
- "the first peer has agreed to it."
- " %d connected peers\n",
- r2net_num_connected_peers());
- ret = -EINVAL;
- } else if (val <= cluster->cl_keepalive_delay_ms) {
- mlog(ML_NOTICE, "r2net: idle timeout must be larger "
- "than keepalive delay\n");
- ret = -EINVAL;
- } else {
- cluster->cl_idle_timeout_ms = val;
- }
- }
-
- return ret;
-}
-
-static ssize_t r2nm_cluster_attr_keepalive_delay_ms_read(
- struct r2nm_cluster *cluster, char *page)
-{
- return sprintf(page, "%u\n", cluster->cl_keepalive_delay_ms);
-}
-
-static ssize_t r2nm_cluster_attr_keepalive_delay_ms_write(
- struct r2nm_cluster *cluster, const char *page, size_t count)
-{
- ssize_t ret;
- unsigned int val = 0;
-
- ret = r2nm_cluster_attr_write(page, count, &val);
-
- if (ret > 0) {
- if (cluster->cl_keepalive_delay_ms != val
- && r2net_num_connected_peers()) {
- mlog(ML_NOTICE,
- "r2net: cannot change keepalive delay after"
- " the first peer has agreed to it."
- " %d connected peers\n",
- r2net_num_connected_peers());
- ret = -EINVAL;
- } else if (val >= cluster->cl_idle_timeout_ms) {
- mlog(ML_NOTICE, "r2net: keepalive delay must be "
- "smaller than idle timeout\n");
- ret = -EINVAL;
- } else {
- cluster->cl_keepalive_delay_ms = val;
- }
- }
-
- return ret;
-}
-
-static ssize_t r2nm_cluster_attr_reconnect_delay_ms_read(
- struct r2nm_cluster *cluster, char *page)
-{
- return sprintf(page, "%u\n", cluster->cl_reconnect_delay_ms);
-}
-
-static ssize_t r2nm_cluster_attr_reconnect_delay_ms_write(
- struct r2nm_cluster *cluster, const char *page, size_t count)
-{
- return r2nm_cluster_attr_write(page, count,
- &cluster->cl_reconnect_delay_ms);
-}
-
-static ssize_t r2nm_cluster_attr_fence_method_read(
- struct r2nm_cluster *cluster, char *page)
-{
- ssize_t ret = 0;
-
- if (cluster)
- ret = sprintf(page, "%s\n",
- r2nm_fence_method_desc[cluster->cl_fence_method]);
- return ret;
-}
-
-static ssize_t r2nm_cluster_attr_fence_method_write(
- struct r2nm_cluster *cluster, const char *page, size_t count)
-{
- unsigned int i;
-
- if (page[count - 1] != '\n')
- goto bail;
-
- for (i = 0; i < R2NM_FENCE_METHODS; ++i) {
- if (count != strlen(r2nm_fence_method_desc[i]) + 1)
- continue;
- if (strncasecmp(page, r2nm_fence_method_desc[i], count - 1))
- continue;
- if (cluster->cl_fence_method != i) {
- printk(KERN_INFO "ramster: Changing fence method to %s\n",
- r2nm_fence_method_desc[i]);
- cluster->cl_fence_method = i;
- }
- return count;
- }
-
-bail:
- return -EINVAL;
-}
-
-static struct r2nm_cluster_attribute r2nm_cluster_attr_idle_timeout_ms = {
- .attr = { .ca_owner = THIS_MODULE,
- .ca_name = "idle_timeout_ms",
- .ca_mode = S_IRUGO | S_IWUSR },
- .show = r2nm_cluster_attr_idle_timeout_ms_read,
- .store = r2nm_cluster_attr_idle_timeout_ms_write,
-};
-
-static struct r2nm_cluster_attribute r2nm_cluster_attr_keepalive_delay_ms = {
- .attr = { .ca_owner = THIS_MODULE,
- .ca_name = "keepalive_delay_ms",
- .ca_mode = S_IRUGO | S_IWUSR },
- .show = r2nm_cluster_attr_keepalive_delay_ms_read,
- .store = r2nm_cluster_attr_keepalive_delay_ms_write,
-};
-
-static struct r2nm_cluster_attribute r2nm_cluster_attr_reconnect_delay_ms = {
- .attr = { .ca_owner = THIS_MODULE,
- .ca_name = "reconnect_delay_ms",
- .ca_mode = S_IRUGO | S_IWUSR },
- .show = r2nm_cluster_attr_reconnect_delay_ms_read,
- .store = r2nm_cluster_attr_reconnect_delay_ms_write,
-};
-
-static struct r2nm_cluster_attribute r2nm_cluster_attr_fence_method = {
- .attr = { .ca_owner = THIS_MODULE,
- .ca_name = "fence_method",
- .ca_mode = S_IRUGO | S_IWUSR },
- .show = r2nm_cluster_attr_fence_method_read,
- .store = r2nm_cluster_attr_fence_method_write,
-};
-
-static struct configfs_attribute *r2nm_cluster_attrs[] = {
- &r2nm_cluster_attr_idle_timeout_ms.attr,
- &r2nm_cluster_attr_keepalive_delay_ms.attr,
- &r2nm_cluster_attr_reconnect_delay_ms.attr,
- &r2nm_cluster_attr_fence_method.attr,
- NULL,
-};
-static ssize_t r2nm_cluster_show(struct config_item *item,
- struct configfs_attribute *attr,
- char *page)
-{
- struct r2nm_cluster *cluster = to_r2nm_cluster(item);
- struct r2nm_cluster_attribute *r2nm_cluster_attr =
- container_of(attr, struct r2nm_cluster_attribute, attr);
- ssize_t ret = 0;
-
- if (r2nm_cluster_attr->show)
- ret = r2nm_cluster_attr->show(cluster, page);
- return ret;
-}
-
-static ssize_t r2nm_cluster_store(struct config_item *item,
- struct configfs_attribute *attr,
- const char *page, size_t count)
-{
- struct r2nm_cluster *cluster = to_r2nm_cluster(item);
- struct r2nm_cluster_attribute *r2nm_cluster_attr =
- container_of(attr, struct r2nm_cluster_attribute, attr);
- ssize_t ret;
-
- if (r2nm_cluster_attr->store == NULL) {
- ret = -EINVAL;
- goto out;
- }
-
- ret = r2nm_cluster_attr->store(cluster, page, count);
- if (ret < count)
- goto out;
-out:
- return ret;
-}
-
-static struct config_item *r2nm_node_group_make_item(struct config_group *group,
- const char *name)
-{
- struct r2nm_node *node = NULL;
-
- if (strlen(name) > R2NM_MAX_NAME_LEN)
- return ERR_PTR(-ENAMETOOLONG);
-
- node = kzalloc(sizeof(struct r2nm_node), GFP_KERNEL);
- if (node == NULL)
- return ERR_PTR(-ENOMEM);
-
- strcpy(node->nd_name, name); /* use item.ci_namebuf instead? */
- config_item_init_type_name(&node->nd_item, name, &r2nm_node_type);
- spin_lock_init(&node->nd_lock);
-
- mlog(ML_CLUSTER, "r2nm: Registering node %s\n", name);
-
- return &node->nd_item;
-}
-
-static void r2nm_node_group_drop_item(struct config_group *group,
- struct config_item *item)
-{
- struct r2nm_node *node = to_r2nm_node(item);
- struct r2nm_cluster *cluster =
- to_r2nm_cluster(group->cg_item.ci_parent);
-
- r2net_disconnect_node(node);
-
- if (cluster->cl_has_local &&
- (cluster->cl_local_node == node->nd_num)) {
- cluster->cl_has_local = 0;
- cluster->cl_local_node = R2NM_INVALID_NODE_NUM;
- r2net_stop_listening(node);
- }
-
- /* XXX call into net to stop this node from trading messages */
-
- write_lock(&cluster->cl_nodes_lock);
-
- /* XXX sloppy */
- if (node->nd_ipv4_address)
- rb_erase(&node->nd_ip_node, &cluster->cl_node_ip_tree);
-
- /* nd_num might be 0 if the node number hasn't been set.. */
- if (cluster->cl_nodes[node->nd_num] == node) {
- cluster->cl_nodes[node->nd_num] = NULL;
- clear_bit(node->nd_num, cluster->cl_nodes_bitmap);
- }
- write_unlock(&cluster->cl_nodes_lock);
-
- mlog(ML_CLUSTER, "r2nm: Unregistered node %s\n",
- config_item_name(&node->nd_item));
-
- config_item_put(item);
-}
-
-static struct configfs_group_operations r2nm_node_group_group_ops = {
- .make_item = r2nm_node_group_make_item,
- .drop_item = r2nm_node_group_drop_item,
-};
-
-static struct config_item_type r2nm_node_group_type = {
- .ct_group_ops = &r2nm_node_group_group_ops,
- .ct_owner = THIS_MODULE,
-};
-
-/* cluster */
-
-static void r2nm_cluster_release(struct config_item *item)
-{
- struct r2nm_cluster *cluster = to_r2nm_cluster(item);
-
- kfree(cluster->cl_group.default_groups);
- kfree(cluster);
-}
-
-static struct configfs_item_operations r2nm_cluster_item_ops = {
- .release = r2nm_cluster_release,
- .show_attribute = r2nm_cluster_show,
- .store_attribute = r2nm_cluster_store,
-};
-
-static struct config_item_type r2nm_cluster_type = {
- .ct_item_ops = &r2nm_cluster_item_ops,
- .ct_attrs = r2nm_cluster_attrs,
- .ct_owner = THIS_MODULE,
-};
-
-/* cluster set */
-
-struct r2nm_cluster_group {
- struct configfs_subsystem cs_subsys;
- /* some stuff? */
-};
-
-#if 0
-static struct r2nm_cluster_group *
-to_r2nm_cluster_group(struct config_group *group)
-{
- return group ?
- container_of(to_configfs_subsystem(group),
- struct r2nm_cluster_group, cs_subsys)
- : NULL;
-}
-#endif
-
-static struct config_group *
-r2nm_cluster_group_make_group(struct config_group *group,
- const char *name)
-{
- struct r2nm_cluster *cluster = NULL;
- struct r2nm_node_group *ns = NULL;
- struct config_group *r2hb_group = NULL, *ret = NULL;
- void *defs = NULL;
-
- /* this runs under the parent dir's i_mutex; there can be only
- * one caller in here at a time */
- if (r2nm_single_cluster)
- return ERR_PTR(-ENOSPC);
-
- cluster = kzalloc(sizeof(struct r2nm_cluster), GFP_KERNEL);
- ns = kzalloc(sizeof(struct r2nm_node_group), GFP_KERNEL);
- defs = kcalloc(3, sizeof(struct config_group *), GFP_KERNEL);
- r2hb_group = r2hb_alloc_hb_set();
- if (cluster == NULL || ns == NULL || r2hb_group == NULL || defs == NULL)
- goto out;
-
- config_group_init_type_name(&cluster->cl_group, name,
- &r2nm_cluster_type);
- config_group_init_type_name(&ns->ns_group, "node",
- &r2nm_node_group_type);
-
- cluster->cl_group.default_groups = defs;
- cluster->cl_group.default_groups[0] = &ns->ns_group;
- cluster->cl_group.default_groups[1] = r2hb_group;
- cluster->cl_group.default_groups[2] = NULL;
- rwlock_init(&cluster->cl_nodes_lock);
- cluster->cl_node_ip_tree = RB_ROOT;
- cluster->cl_reconnect_delay_ms = R2NET_RECONNECT_DELAY_MS_DEFAULT;
- cluster->cl_idle_timeout_ms = R2NET_IDLE_TIMEOUT_MS_DEFAULT;
- cluster->cl_keepalive_delay_ms = R2NET_KEEPALIVE_DELAY_MS_DEFAULT;
- cluster->cl_fence_method = R2NM_FENCE_RESET;
-
- ret = &cluster->cl_group;
- r2nm_single_cluster = cluster;
-
-out:
- if (ret == NULL) {
- kfree(cluster);
- kfree(ns);
- r2hb_free_hb_set(r2hb_group);
- kfree(defs);
- ret = ERR_PTR(-ENOMEM);
- }
-
- return ret;
-}
-
-static void r2nm_cluster_group_drop_item(struct config_group *group,
- struct config_item *item)
-{
- struct r2nm_cluster *cluster = to_r2nm_cluster(item);
- int i;
- struct config_item *killme;
-
- BUG_ON(r2nm_single_cluster != cluster);
- r2nm_single_cluster = NULL;
-
- for (i = 0; cluster->cl_group.default_groups[i]; i++) {
- killme = &cluster->cl_group.default_groups[i]->cg_item;
- cluster->cl_group.default_groups[i] = NULL;
- config_item_put(killme);
- }
-
- config_item_put(item);
-}
-
-static struct configfs_group_operations r2nm_cluster_group_group_ops = {
- .make_group = r2nm_cluster_group_make_group,
- .drop_item = r2nm_cluster_group_drop_item,
-};
-
-static struct config_item_type r2nm_cluster_group_type = {
- .ct_group_ops = &r2nm_cluster_group_group_ops,
- .ct_owner = THIS_MODULE,
-};
-
-static struct r2nm_cluster_group r2nm_cluster_group = {
- .cs_subsys = {
- .su_group = {
- .cg_item = {
- .ci_namebuf = "cluster",
- .ci_type = &r2nm_cluster_group_type,
- },
- },
- },
-};
-
-int r2nm_depend_item(struct config_item *item)
-{
- return configfs_depend_item(&r2nm_cluster_group.cs_subsys, item);
-}
-
-void r2nm_undepend_item(struct config_item *item)
-{
- configfs_undepend_item(&r2nm_cluster_group.cs_subsys, item);
-}
-
-int r2nm_depend_this_node(void)
-{
- int ret = 0;
- struct r2nm_node *local_node;
-
- local_node = r2nm_get_node_by_num(r2nm_this_node());
- if (!local_node) {
- ret = -EINVAL;
- goto out;
- }
-
- ret = r2nm_depend_item(&local_node->nd_item);
- r2nm_node_put(local_node);
-
-out:
- return ret;
-}
-
-void r2nm_undepend_this_node(void)
-{
- struct r2nm_node *local_node;
-
- local_node = r2nm_get_node_by_num(r2nm_this_node());
- BUG_ON(!local_node);
-
- r2nm_undepend_item(&local_node->nd_item);
- r2nm_node_put(local_node);
-}
-
-
-static void __exit exit_r2nm(void)
-{
- /* XXX sync with hb callbacks and shut down hb? */
- r2net_unregister_hb_callbacks();
- configfs_unregister_subsystem(&r2nm_cluster_group.cs_subsys);
-
- r2net_exit();
- r2hb_exit();
-}
-
-static int __init init_r2nm(void)
-{
- int ret = -1;
-
- ret = r2hb_init();
- if (ret)
- goto out;
-
- ret = r2net_init();
- if (ret)
- goto out_r2hb;
-
- ret = r2net_register_hb_callbacks();
- if (ret)
- goto out_r2net;
-
- config_group_init(&r2nm_cluster_group.cs_subsys.su_group);
- mutex_init(&r2nm_cluster_group.cs_subsys.su_mutex);
- ret = configfs_register_subsystem(&r2nm_cluster_group.cs_subsys);
- if (ret) {
- printk(KERN_ERR "nodemanager: Registration returned %d\n", ret);
- goto out_callbacks;
- }
-
- if (!ret)
- goto out;
-
- configfs_unregister_subsystem(&r2nm_cluster_group.cs_subsys);
-out_callbacks:
- r2net_unregister_hb_callbacks();
-out_r2net:
- r2net_exit();
-out_r2hb:
- r2hb_exit();
-out:
- return ret;
-}
-
-MODULE_AUTHOR("Oracle");
-MODULE_LICENSE("GPL");
-
-module_init(init_r2nm)
-module_exit(exit_r2nm)
diff --git a/drivers/staging/ramster/cluster/nodemanager.h b/drivers/staging/ramster/cluster/nodemanager.h
deleted file mode 100644
index 41a04df..0000000
--- a/drivers/staging/ramster/cluster/nodemanager.h
+++ /dev/null
@@ -1,88 +0,0 @@
-/* -*- mode: c; c-basic-offset: 8; -*-
- * vim: noexpandtab sw=8 ts=8 sts=0:
- *
- * nodemanager.h
- *
- * Function prototypes
- *
- * Copyright (C) 2004 Oracle. All rights reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public
- * License along with this program; if not, write to the
- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 021110-1307, USA.
- *
- */
-
-#ifndef R2CLUSTER_NODEMANAGER_H
-#define R2CLUSTER_NODEMANAGER_H
-
-#include "ramster_nodemanager.h"
-
-/* This totally doesn't belong here. */
-#include <linux/configfs.h>
-#include <linux/rbtree.h>
-
-enum r2nm_fence_method {
- R2NM_FENCE_RESET = 0,
- R2NM_FENCE_PANIC,
- R2NM_FENCE_METHODS, /* Number of fence methods */
-};
-
-struct r2nm_node {
- spinlock_t nd_lock;
- struct config_item nd_item;
- char nd_name[R2NM_MAX_NAME_LEN+1]; /* replace? */
- __u8 nd_num;
- /* only one address per node, as attributes, for now. */
- __be32 nd_ipv4_address;
- __be16 nd_ipv4_port;
- struct rb_node nd_ip_node;
- /* there can be only one local node for now */
- int nd_local;
-
- unsigned long nd_set_attributes;
-};
-
-struct r2nm_cluster {
- struct config_group cl_group;
- unsigned cl_has_local:1;
- u8 cl_local_node;
- rwlock_t cl_nodes_lock;
- struct r2nm_node *cl_nodes[R2NM_MAX_NODES];
- struct rb_root cl_node_ip_tree;
- unsigned int cl_idle_timeout_ms;
- unsigned int cl_keepalive_delay_ms;
- unsigned int cl_reconnect_delay_ms;
- enum r2nm_fence_method cl_fence_method;
-
- /* part of a hack for disk bitmap.. will go eventually. - zab */
- unsigned long cl_nodes_bitmap[BITS_TO_LONGS(R2NM_MAX_NODES)];
-};
-
-extern struct r2nm_cluster *r2nm_single_cluster;
-
-u8 r2nm_this_node(void);
-
-int r2nm_configured_node_map(unsigned long *map, unsigned bytes);
-struct r2nm_node *r2nm_get_node_by_num(u8 node_num);
-struct r2nm_node *r2nm_get_node_by_ip(__be32 addr);
-void r2nm_node_get(struct r2nm_node *node);
-void r2nm_node_put(struct r2nm_node *node);
-
-int r2nm_depend_item(struct config_item *item);
-void r2nm_undepend_item(struct config_item *item);
-int r2nm_depend_this_node(void);
-void r2nm_undepend_this_node(void);
-
-#endif /* R2CLUSTER_NODEMANAGER_H */
diff --git a/drivers/staging/ramster/cluster/ramster_nodemanager.h b/drivers/staging/ramster/cluster/ramster_nodemanager.h
deleted file mode 100644
index 49f879d..0000000
--- a/drivers/staging/ramster/cluster/ramster_nodemanager.h
+++ /dev/null
@@ -1,39 +0,0 @@
-/* -*- mode: c; c-basic-offset: 8; -*-
- * vim: noexpandtab sw=8 ts=8 sts=0:
- *
- * ramster_nodemanager.h
- *
- * Header describing the interface between userspace and the kernel
- * for the ramster_nodemanager module.
- *
- * Copyright (C) 2002, 2004, 2012 Oracle. All rights reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public
- * License along with this program; if not, write to the
- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 021110-1307, USA.
- *
- */
-
-#ifndef _RAMSTER_NODEMANAGER_H
-#define _RAMSTER_NODEMANAGER_H
-
-#define R2NM_API_VERSION 5
-
-#define R2NM_MAX_NODES 255
-#define R2NM_INVALID_NODE_NUM 255
-
-/* host name, group name, cluster name all 64 bytes */
-#define R2NM_MAX_NAME_LEN 64 /* __NEW_UTS_LEN */
-
-#endif /* _RAMSTER_NODEMANAGER_H */
diff --git a/drivers/staging/ramster/cluster/tcp.c b/drivers/staging/ramster/cluster/tcp.c
deleted file mode 100644
index d0a07d7..0000000
--- a/drivers/staging/ramster/cluster/tcp.c
+++ /dev/null
@@ -1,2256 +0,0 @@
-/* -*- mode: c; c-basic-offset: 8; -*-
- *
- * vim: noexpandtab sw=8 ts=8 sts=0:
- *
- * Copyright (C) 2004 Oracle. All rights reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public
- * License along with this program; if not, write to the
- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 021110-1307, USA.
- *
- * ----
- *
- * Callers for this were originally written against a very simple synchronus
- * API. This implementation reflects those simple callers. Some day I'm sure
- * we'll need to move to a more robust posting/callback mechanism.
- *
- * Transmit calls pass in kernel virtual addresses and block copying this into
- * the socket's tx buffers via a usual blocking sendmsg. They'll block waiting
- * for a failed socket to timeout. TX callers can also pass in a poniter to an
- * 'int' which gets filled with an errno off the wire in response to the
- * message they send.
- *
- * Handlers for unsolicited messages are registered. Each socket has a page
- * that incoming data is copied into. First the header, then the data.
- * Handlers are called from only one thread with a reference to this per-socket
- * page. This page is destroyed after the handler call, so it can't be
- * referenced beyond the call. Handlers may block but are discouraged from
- * doing so.
- *
- * Any framing errors (bad magic, large payload lengths) close a connection.
- *
- * Our sock_container holds the state we associate with a socket. It's current
- * framing state is held there as well as the refcounting we do around when it
- * is safe to tear down the socket. The socket is only finally torn down from
- * the container when the container loses all of its references -- so as long
- * as you hold a ref on the container you can trust that the socket is valid
- * for use with kernel socket APIs.
- *
- * Connections are initiated between a pair of nodes when the node with the
- * higher node number gets a heartbeat callback which indicates that the lower
- * numbered node has started heartbeating. The lower numbered node is passive
- * and only accepts the connection if the higher numbered node is heartbeating.
- */
-
-#include <linux/kernel.h>
-#include <linux/jiffies.h>
-#include <linux/slab.h>
-#include <linux/idr.h>
-#include <linux/kref.h>
-#include <linux/net.h>
-#include <linux/export.h>
-#include <linux/uaccess.h>
-#include <net/tcp.h>
-
-
-#include "heartbeat.h"
-#include "tcp.h"
-#include "nodemanager.h"
-#define MLOG_MASK_PREFIX ML_TCP
-#include "masklog.h"
-
-#include "tcp_internal.h"
-
-#define SC_NODEF_FMT "node %s (num %u) at %pI4:%u"
-
-/*
- * In the following two log macros, the whitespace after the ',' just
- * before ##args is intentional. Otherwise, gcc 2.95 will eat the
- * previous token if args expands to nothing.
- */
-#define msglog(hdr, fmt, args...) do { \
- typeof(hdr) __hdr = (hdr); \
- mlog(ML_MSG, "[mag %u len %u typ %u stat %d sys_stat %d " \
- "key %08x num %u] " fmt, \
- be16_to_cpu(__hdr->magic), be16_to_cpu(__hdr->data_len), \
- be16_to_cpu(__hdr->msg_type), be32_to_cpu(__hdr->status), \
- be32_to_cpu(__hdr->sys_status), be32_to_cpu(__hdr->key), \
- be32_to_cpu(__hdr->msg_num) , ##args); \
-} while (0)
-
-#define sclog(sc, fmt, args...) do { \
- typeof(sc) __sc = (sc); \
- mlog(ML_SOCKET, "[sc %p refs %d sock %p node %u page %p " \
- "pg_off %zu] " fmt, __sc, \
- atomic_read(&__sc->sc_kref.refcount), __sc->sc_sock, \
- __sc->sc_node->nd_num, __sc->sc_page, __sc->sc_page_off , \
- ##args); \
-} while (0)
-
-static DEFINE_RWLOCK(r2net_handler_lock);
-static struct rb_root r2net_handler_tree = RB_ROOT;
-
-static struct r2net_node r2net_nodes[R2NM_MAX_NODES];
-
-/* XXX someday we'll need better accounting */
-static struct socket *r2net_listen_sock;
-
-/*
- * listen work is only queued by the listening socket callbacks on the
- * r2net_wq. teardown detaches the callbacks before destroying the workqueue.
- * quorum work is queued as sock containers are shutdown.. stop_listening
- * tears down all the node's sock containers, preventing future shutdowns
- * and queued quorum work, before canceling delayed quorum work and
- * destroying the work queue.
- */
-static struct workqueue_struct *r2net_wq;
-static struct work_struct r2net_listen_work;
-
-static struct r2hb_callback_func r2net_hb_up, r2net_hb_down;
-#define R2NET_HB_PRI 0x1
-
-static struct r2net_handshake *r2net_hand;
-static struct r2net_msg *r2net_keep_req, *r2net_keep_resp;
-
-static int r2net_sys_err_translations[R2NET_ERR_MAX] = {
- [R2NET_ERR_NONE] = 0,
- [R2NET_ERR_NO_HNDLR] = -ENOPROTOOPT,
- [R2NET_ERR_OVERFLOW] = -EOVERFLOW,
- [R2NET_ERR_DIED] = -EHOSTDOWN,};
-
-/* can't quite avoid *all* internal declarations :/ */
-static void r2net_sc_connect_completed(struct work_struct *work);
-static void r2net_rx_until_empty(struct work_struct *work);
-static void r2net_shutdown_sc(struct work_struct *work);
-static void r2net_listen_data_ready(struct sock *sk, int bytes);
-static void r2net_sc_send_keep_req(struct work_struct *work);
-static void r2net_idle_timer(unsigned long data);
-static void r2net_sc_postpone_idle(struct r2net_sock_container *sc);
-static void r2net_sc_reset_idle_timer(struct r2net_sock_container *sc);
-
-#ifdef CONFIG_DEBUG_FS
-static void r2net_init_nst(struct r2net_send_tracking *nst, u32 msgtype,
- u32 msgkey, struct task_struct *task, u8 node)
-{
- INIT_LIST_HEAD(&nst->st_net_debug_item);
- nst->st_task = task;
- nst->st_msg_type = msgtype;
- nst->st_msg_key = msgkey;
- nst->st_node = node;
-}
-
-static inline void r2net_set_nst_sock_time(struct r2net_send_tracking *nst)
-{
- nst->st_sock_time = ktime_get();
-}
-
-static inline void r2net_set_nst_send_time(struct r2net_send_tracking *nst)
-{
- nst->st_send_time = ktime_get();
-}
-
-static inline void r2net_set_nst_status_time(struct r2net_send_tracking *nst)
-{
- nst->st_status_time = ktime_get();
-}
-
-static inline void r2net_set_nst_sock_container(struct r2net_send_tracking *nst,
- struct r2net_sock_container *sc)
-{
- nst->st_sc = sc;
-}
-
-static inline void r2net_set_nst_msg_id(struct r2net_send_tracking *nst,
- u32 msg_id)
-{
- nst->st_id = msg_id;
-}
-
-static inline void r2net_set_sock_timer(struct r2net_sock_container *sc)
-{
- sc->sc_tv_timer = ktime_get();
-}
-
-static inline void r2net_set_data_ready_time(struct r2net_sock_container *sc)
-{
- sc->sc_tv_data_ready = ktime_get();
-}
-
-static inline void r2net_set_advance_start_time(struct r2net_sock_container *sc)
-{
- sc->sc_tv_advance_start = ktime_get();
-}
-
-static inline void r2net_set_advance_stop_time(struct r2net_sock_container *sc)
-{
- sc->sc_tv_advance_stop = ktime_get();
-}
-
-static inline void r2net_set_func_start_time(struct r2net_sock_container *sc)
-{
- sc->sc_tv_func_start = ktime_get();
-}
-
-static inline void r2net_set_func_stop_time(struct r2net_sock_container *sc)
-{
- sc->sc_tv_func_stop = ktime_get();
-}
-
-#else /* CONFIG_DEBUG_FS */
-# define r2net_init_nst(a, b, c, d, e)
-# define r2net_set_nst_sock_time(a)
-# define r2net_set_nst_send_time(a)
-# define r2net_set_nst_status_time(a)
-# define r2net_set_nst_sock_container(a, b)
-# define r2net_set_nst_msg_id(a, b)
-# define r2net_set_sock_timer(a)
-# define r2net_set_data_ready_time(a)
-# define r2net_set_advance_start_time(a)
-# define r2net_set_advance_stop_time(a)
-# define r2net_set_func_start_time(a)
-# define r2net_set_func_stop_time(a)
-#endif /* CONFIG_DEBUG_FS */
-
-#ifdef CONFIG_RAMSTER_FS_STATS
-static ktime_t r2net_get_func_run_time(struct r2net_sock_container *sc)
-{
- return ktime_sub(sc->sc_tv_func_stop, sc->sc_tv_func_start);
-}
-
-static void r2net_update_send_stats(struct r2net_send_tracking *nst,
- struct r2net_sock_container *sc)
-{
- sc->sc_tv_status_total = ktime_add(sc->sc_tv_status_total,
- ktime_sub(ktime_get(),
- nst->st_status_time));
- sc->sc_tv_send_total = ktime_add(sc->sc_tv_send_total,
- ktime_sub(nst->st_status_time,
- nst->st_send_time));
- sc->sc_tv_acquiry_total = ktime_add(sc->sc_tv_acquiry_total,
- ktime_sub(nst->st_send_time,
- nst->st_sock_time));
- sc->sc_send_count++;
-}
-
-static void r2net_update_recv_stats(struct r2net_sock_container *sc)
-{
- sc->sc_tv_process_total = ktime_add(sc->sc_tv_process_total,
- r2net_get_func_run_time(sc));
- sc->sc_recv_count++;
-}
-
-#else
-
-# define r2net_update_send_stats(a, b)
-
-# define r2net_update_recv_stats(sc)
-
-#endif /* CONFIG_RAMSTER_FS_STATS */
-
-static inline int r2net_reconnect_delay(void)
-{
- return r2nm_single_cluster->cl_reconnect_delay_ms;
-}
-
-static inline int r2net_keepalive_delay(void)
-{
- return r2nm_single_cluster->cl_keepalive_delay_ms;
-}
-
-static inline int r2net_idle_timeout(void)
-{
- return r2nm_single_cluster->cl_idle_timeout_ms;
-}
-
-static inline int r2net_sys_err_to_errno(enum r2net_system_error err)
-{
- int trans;
- BUG_ON(err >= R2NET_ERR_MAX);
- trans = r2net_sys_err_translations[err];
-
- /* Just in case we mess up the translation table above */
- BUG_ON(err != R2NET_ERR_NONE && trans == 0);
- return trans;
-}
-
-struct r2net_node *r2net_nn_from_num(u8 node_num)
-{
- BUG_ON(node_num >= ARRAY_SIZE(r2net_nodes));
- return &r2net_nodes[node_num];
-}
-
-static u8 r2net_num_from_nn(struct r2net_node *nn)
-{
- BUG_ON(nn == NULL);
- return nn - r2net_nodes;
-}
-
-/* ------------------------------------------------------------ */
-
-static int r2net_prep_nsw(struct r2net_node *nn, struct r2net_status_wait *nsw)
-{
- int ret = 0;
-
- do {
- if (!idr_pre_get(&nn->nn_status_idr, GFP_ATOMIC)) {
- ret = -EAGAIN;
- break;
- }
- spin_lock(&nn->nn_lock);
- ret = idr_get_new(&nn->nn_status_idr, nsw, &nsw->ns_id);
- if (ret == 0)
- list_add_tail(&nsw->ns_node_item,
- &nn->nn_status_list);
- spin_unlock(&nn->nn_lock);
- } while (ret == -EAGAIN);
-
- if (ret == 0) {
- init_waitqueue_head(&nsw->ns_wq);
- nsw->ns_sys_status = R2NET_ERR_NONE;
- nsw->ns_status = 0;
- }
-
- return ret;
-}
-
-static void r2net_complete_nsw_locked(struct r2net_node *nn,
- struct r2net_status_wait *nsw,
- enum r2net_system_error sys_status,
- s32 status)
-{
- assert_spin_locked(&nn->nn_lock);
-
- if (!list_empty(&nsw->ns_node_item)) {
- list_del_init(&nsw->ns_node_item);
- nsw->ns_sys_status = sys_status;
- nsw->ns_status = status;
- idr_remove(&nn->nn_status_idr, nsw->ns_id);
- wake_up(&nsw->ns_wq);
- }
-}
-
-static void r2net_complete_nsw(struct r2net_node *nn,
- struct r2net_status_wait *nsw,
- u64 id, enum r2net_system_error sys_status,
- s32 status)
-{
- spin_lock(&nn->nn_lock);
- if (nsw == NULL) {
- if (id > INT_MAX)
- goto out;
-
- nsw = idr_find(&nn->nn_status_idr, id);
- if (nsw == NULL)
- goto out;
- }
-
- r2net_complete_nsw_locked(nn, nsw, sys_status, status);
-
-out:
- spin_unlock(&nn->nn_lock);
- return;
-}
-
-static void r2net_complete_nodes_nsw(struct r2net_node *nn)
-{
- struct r2net_status_wait *nsw, *tmp;
- unsigned int num_kills = 0;
-
- assert_spin_locked(&nn->nn_lock);
-
- list_for_each_entry_safe(nsw, tmp, &nn->nn_status_list, ns_node_item) {
- r2net_complete_nsw_locked(nn, nsw, R2NET_ERR_DIED, 0);
- num_kills++;
- }
-
- mlog(0, "completed %d messages for node %u\n", num_kills,
- r2net_num_from_nn(nn));
-}
-
-static int r2net_nsw_completed(struct r2net_node *nn,
- struct r2net_status_wait *nsw)
-{
- int completed;
- spin_lock(&nn->nn_lock);
- completed = list_empty(&nsw->ns_node_item);
- spin_unlock(&nn->nn_lock);
- return completed;
-}
-
-/* ------------------------------------------------------------ */
-
-static void sc_kref_release(struct kref *kref)
-{
- struct r2net_sock_container *sc = container_of(kref,
- struct r2net_sock_container, sc_kref);
- BUG_ON(timer_pending(&sc->sc_idle_timeout));
-
- sclog(sc, "releasing\n");
-
- if (sc->sc_sock) {
- sock_release(sc->sc_sock);
- sc->sc_sock = NULL;
- }
-
- r2nm_undepend_item(&sc->sc_node->nd_item);
- r2nm_node_put(sc->sc_node);
- sc->sc_node = NULL;
-
- r2net_debug_del_sc(sc);
- kfree(sc);
-}
-
-static void sc_put(struct r2net_sock_container *sc)
-{
- sclog(sc, "put\n");
- kref_put(&sc->sc_kref, sc_kref_release);
-}
-static void sc_get(struct r2net_sock_container *sc)
-{
- sclog(sc, "get\n");
- kref_get(&sc->sc_kref);
-}
-static struct r2net_sock_container *sc_alloc(struct r2nm_node *node)
-{
- struct r2net_sock_container *sc, *ret = NULL;
- struct page *page = NULL;
- int status = 0;
-
- page = alloc_page(GFP_NOFS);
- sc = kzalloc(sizeof(*sc), GFP_NOFS);
- if (sc == NULL || page == NULL)
- goto out;
-
- kref_init(&sc->sc_kref);
- r2nm_node_get(node);
- sc->sc_node = node;
-
- /* pin the node item of the remote node */
- status = r2nm_depend_item(&node->nd_item);
- if (status) {
- mlog_errno(status);
- r2nm_node_put(node);
- goto out;
- }
- INIT_WORK(&sc->sc_connect_work, r2net_sc_connect_completed);
- INIT_WORK(&sc->sc_rx_work, r2net_rx_until_empty);
- INIT_WORK(&sc->sc_shutdown_work, r2net_shutdown_sc);
- INIT_DELAYED_WORK(&sc->sc_keepalive_work, r2net_sc_send_keep_req);
-
- init_timer(&sc->sc_idle_timeout);
- sc->sc_idle_timeout.function = r2net_idle_timer;
- sc->sc_idle_timeout.data = (unsigned long)sc;
-
- sclog(sc, "alloced\n");
-
- ret = sc;
- sc->sc_page = page;
- r2net_debug_add_sc(sc);
- sc = NULL;
- page = NULL;
-
-out:
- if (page)
- __free_page(page);
- kfree(sc);
-
- return ret;
-}
-
-/* ------------------------------------------------------------ */
-
-static void r2net_sc_queue_work(struct r2net_sock_container *sc,
- struct work_struct *work)
-{
- sc_get(sc);
- if (!queue_work(r2net_wq, work))
- sc_put(sc);
-}
-static void r2net_sc_queue_delayed_work(struct r2net_sock_container *sc,
- struct delayed_work *work,
- int delay)
-{
- sc_get(sc);
- if (!queue_delayed_work(r2net_wq, work, delay))
- sc_put(sc);
-}
-static void r2net_sc_cancel_delayed_work(struct r2net_sock_container *sc,
- struct delayed_work *work)
-{
- if (cancel_delayed_work(work))
- sc_put(sc);
-}
-
-static atomic_t r2net_connected_peers = ATOMIC_INIT(0);
-
-int r2net_num_connected_peers(void)
-{
- return atomic_read(&r2net_connected_peers);
-}
-
-static void r2net_set_nn_state(struct r2net_node *nn,
- struct r2net_sock_container *sc,
- unsigned valid, int err)
-{
- int was_valid = nn->nn_sc_valid;
- int was_err = nn->nn_persistent_error;
- struct r2net_sock_container *old_sc = nn->nn_sc;
-
- assert_spin_locked(&nn->nn_lock);
-
- if (old_sc && !sc)
- atomic_dec(&r2net_connected_peers);
- else if (!old_sc && sc)
- atomic_inc(&r2net_connected_peers);
-
- /* the node num comparison and single connect/accept path should stop
- * an non-null sc from being overwritten with another */
- BUG_ON(sc && nn->nn_sc && nn->nn_sc != sc);
- mlog_bug_on_msg(err && valid, "err %d valid %u\n", err, valid);
- mlog_bug_on_msg(valid && !sc, "valid %u sc %p\n", valid, sc);
-
- if (was_valid && !valid && err == 0)
- err = -ENOTCONN;
-
- mlog(ML_CONN, "node %u sc: %p -> %p, valid %u -> %u, err %d -> %d\n",
- r2net_num_from_nn(nn), nn->nn_sc, sc, nn->nn_sc_valid, valid,
- nn->nn_persistent_error, err);
-
- nn->nn_sc = sc;
- nn->nn_sc_valid = valid ? 1 : 0;
- nn->nn_persistent_error = err;
-
- /* mirrors r2net_tx_can_proceed() */
- if (nn->nn_persistent_error || nn->nn_sc_valid)
- wake_up(&nn->nn_sc_wq);
-
- if (!was_err && nn->nn_persistent_error) {
- queue_delayed_work(r2net_wq, &nn->nn_still_up,
- msecs_to_jiffies(R2NET_QUORUM_DELAY_MS));
- }
-
- if (was_valid && !valid) {
- printk(KERN_NOTICE "ramster: No longer connected to "
- SC_NODEF_FMT "\n",
- old_sc->sc_node->nd_name, old_sc->sc_node->nd_num,
- &old_sc->sc_node->nd_ipv4_address,
- ntohs(old_sc->sc_node->nd_ipv4_port));
- r2net_complete_nodes_nsw(nn);
- }
-
- if (!was_valid && valid) {
- cancel_delayed_work(&nn->nn_connect_expired);
- printk(KERN_NOTICE "ramster: %s " SC_NODEF_FMT "\n",
- r2nm_this_node() > sc->sc_node->nd_num ?
- "Connected to" : "Accepted connection from",
- sc->sc_node->nd_name, sc->sc_node->nd_num,
- &sc->sc_node->nd_ipv4_address,
- ntohs(sc->sc_node->nd_ipv4_port));
- }
-
- /* trigger the connecting worker func as long as we're not valid,
- * it will back off if it shouldn't connect. This can be called
- * from node config teardown and so needs to be careful about
- * the work queue actually being up. */
- if (!valid && r2net_wq) {
- unsigned long delay;
- /* delay if we're within a RECONNECT_DELAY of the
- * last attempt */
- delay = (nn->nn_last_connect_attempt +
- msecs_to_jiffies(r2net_reconnect_delay()))
- - jiffies;
- if (delay > msecs_to_jiffies(r2net_reconnect_delay()))
- delay = 0;
- mlog(ML_CONN, "queueing conn attempt in %lu jiffies\n", delay);
- queue_delayed_work(r2net_wq, &nn->nn_connect_work, delay);
-
- /*
- * Delay the expired work after idle timeout.
- *
- * We might have lots of failed connection attempts that run
- * through here but we only cancel the connect_expired work when
- * a connection attempt succeeds. So only the first enqueue of
- * the connect_expired work will do anything. The rest will see
- * that it's already queued and do nothing.
- */
- delay += msecs_to_jiffies(r2net_idle_timeout());
- queue_delayed_work(r2net_wq, &nn->nn_connect_expired, delay);
- }
-
- /* keep track of the nn's sc ref for the caller */
- if ((old_sc == NULL) && sc)
- sc_get(sc);
- if (old_sc && (old_sc != sc)) {
- r2net_sc_queue_work(old_sc, &old_sc->sc_shutdown_work);
- sc_put(old_sc);
- }
-}
-
-/* see r2net_register_callbacks() */
-static void r2net_data_ready(struct sock *sk, int bytes)
-{
- void (*ready)(struct sock *sk, int bytes);
-
- read_lock(&sk->sk_callback_lock);
- if (sk->sk_user_data) {
- struct r2net_sock_container *sc = sk->sk_user_data;
- sclog(sc, "data_ready hit\n");
- r2net_set_data_ready_time(sc);
- r2net_sc_queue_work(sc, &sc->sc_rx_work);
- ready = sc->sc_data_ready;
- } else {
- ready = sk->sk_data_ready;
- }
- read_unlock(&sk->sk_callback_lock);
-
- ready(sk, bytes);
-}
-
-/* see r2net_register_callbacks() */
-static void r2net_state_change(struct sock *sk)
-{
- void (*state_change)(struct sock *sk);
- struct r2net_sock_container *sc;
-
- read_lock(&sk->sk_callback_lock);
- sc = sk->sk_user_data;
- if (sc == NULL) {
- state_change = sk->sk_state_change;
- goto out;
- }
-
- sclog(sc, "state_change to %d\n", sk->sk_state);
-
- state_change = sc->sc_state_change;
-
- switch (sk->sk_state) {
-
- /* ignore connecting sockets as they make progress */
- case TCP_SYN_SENT:
- case TCP_SYN_RECV:
- break;
- case TCP_ESTABLISHED:
- r2net_sc_queue_work(sc, &sc->sc_connect_work);
- break;
- default:
- printk(KERN_INFO "ramster: Connection to "
- SC_NODEF_FMT " shutdown, state %d\n",
- sc->sc_node->nd_name, sc->sc_node->nd_num,
- &sc->sc_node->nd_ipv4_address,
- ntohs(sc->sc_node->nd_ipv4_port), sk->sk_state);
- r2net_sc_queue_work(sc, &sc->sc_shutdown_work);
- break;
-
- }
-out:
- read_unlock(&sk->sk_callback_lock);
- state_change(sk);
-}
-
-/*
- * we register callbacks so we can queue work on events before calling
- * the original callbacks. our callbacks are careful to test user_data
- * to discover when they've reaced with r2net_unregister_callbacks().
- */
-static void r2net_register_callbacks(struct sock *sk,
- struct r2net_sock_container *sc)
-{
- write_lock_bh(&sk->sk_callback_lock);
-
- /* accepted sockets inherit the old listen socket data ready */
- if (sk->sk_data_ready == r2net_listen_data_ready) {
- sk->sk_data_ready = sk->sk_user_data;
- sk->sk_user_data = NULL;
- }
-
- BUG_ON(sk->sk_user_data != NULL);
- sk->sk_user_data = sc;
- sc_get(sc);
-
- sc->sc_data_ready = sk->sk_data_ready;
- sc->sc_state_change = sk->sk_state_change;
- sk->sk_data_ready = r2net_data_ready;
- sk->sk_state_change = r2net_state_change;
-
- mutex_init(&sc->sc_send_lock);
-
- write_unlock_bh(&sk->sk_callback_lock);
-}
-
-static int r2net_unregister_callbacks(struct sock *sk,
- struct r2net_sock_container *sc)
-{
- int ret = 0;
-
- write_lock_bh(&sk->sk_callback_lock);
- if (sk->sk_user_data == sc) {
- ret = 1;
- sk->sk_user_data = NULL;
- sk->sk_data_ready = sc->sc_data_ready;
- sk->sk_state_change = sc->sc_state_change;
- }
- write_unlock_bh(&sk->sk_callback_lock);
-
- return ret;
-}
-
-/*
- * this is a little helper that is called by callers who have seen a problem
- * with an sc and want to detach it from the nn if someone already hasn't beat
- * them to it. if an error is given then the shutdown will be persistent
- * and pending transmits will be canceled.
- */
-static void r2net_ensure_shutdown(struct r2net_node *nn,
- struct r2net_sock_container *sc,
- int err)
-{
- spin_lock(&nn->nn_lock);
- if (nn->nn_sc == sc)
- r2net_set_nn_state(nn, NULL, 0, err);
- spin_unlock(&nn->nn_lock);
-}
-
-/*
- * This work queue function performs the blocking parts of socket shutdown. A
- * few paths lead here. set_nn_state will trigger this callback if it sees an
- * sc detached from the nn. state_change will also trigger this callback
- * directly when it sees errors. In that case we need to call set_nn_state
- * ourselves as state_change couldn't get the nn_lock and call set_nn_state
- * itself.
- */
-static void r2net_shutdown_sc(struct work_struct *work)
-{
- struct r2net_sock_container *sc =
- container_of(work, struct r2net_sock_container,
- sc_shutdown_work);
- struct r2net_node *nn = r2net_nn_from_num(sc->sc_node->nd_num);
-
- sclog(sc, "shutting down\n");
-
- /* drop the callbacks ref and call shutdown only once */
- if (r2net_unregister_callbacks(sc->sc_sock->sk, sc)) {
- /* we shouldn't flush as we're in the thread, the
- * races with pending sc work structs are harmless */
- del_timer_sync(&sc->sc_idle_timeout);
- r2net_sc_cancel_delayed_work(sc, &sc->sc_keepalive_work);
- sc_put(sc);
- kernel_sock_shutdown(sc->sc_sock, SHUT_RDWR);
- }
-
- /* not fatal so failed connects before the other guy has our
- * heartbeat can be retried */
- r2net_ensure_shutdown(nn, sc, 0);
- sc_put(sc);
-}
-
-/* ------------------------------------------------------------ */
-
-static int r2net_handler_cmp(struct r2net_msg_handler *nmh, u32 msg_type,
- u32 key)
-{
- int ret = memcmp(&nmh->nh_key, &key, sizeof(key));
-
- if (ret == 0)
- ret = memcmp(&nmh->nh_msg_type, &msg_type, sizeof(msg_type));
-
- return ret;
-}
-
-static struct r2net_msg_handler *
-r2net_handler_tree_lookup(u32 msg_type, u32 key, struct rb_node ***ret_p,
- struct rb_node **ret_parent)
-{
- struct rb_node **p = &r2net_handler_tree.rb_node;
- struct rb_node *parent = NULL;
- struct r2net_msg_handler *nmh, *ret = NULL;
- int cmp;
-
- while (*p) {
- parent = *p;
- nmh = rb_entry(parent, struct r2net_msg_handler, nh_node);
- cmp = r2net_handler_cmp(nmh, msg_type, key);
-
- if (cmp < 0)
- p = &(*p)->rb_left;
- else if (cmp > 0)
- p = &(*p)->rb_right;
- else {
- ret = nmh;
- break;
- }
- }
-
- if (ret_p != NULL)
- *ret_p = p;
- if (ret_parent != NULL)
- *ret_parent = parent;
-
- return ret;
-}
-
-static void r2net_handler_kref_release(struct kref *kref)
-{
- struct r2net_msg_handler *nmh;
- nmh = container_of(kref, struct r2net_msg_handler, nh_kref);
-
- kfree(nmh);
-}
-
-static void r2net_handler_put(struct r2net_msg_handler *nmh)
-{
- kref_put(&nmh->nh_kref, r2net_handler_kref_release);
-}
-
-/* max_len is protection for the handler func. incoming messages won't
- * be given to the handler if their payload is longer than the max. */
-int r2net_register_handler(u32 msg_type, u32 key, u32 max_len,
- r2net_msg_handler_func *func, void *data,
- r2net_post_msg_handler_func *post_func,
- struct list_head *unreg_list)
-{
- struct r2net_msg_handler *nmh = NULL;
- struct rb_node **p, *parent;
- int ret = 0;
-
- if (max_len > R2NET_MAX_PAYLOAD_BYTES) {
- mlog(0, "max_len for message handler out of range: %u\n",
- max_len);
- ret = -EINVAL;
- goto out;
- }
-
- if (!msg_type) {
- mlog(0, "no message type provided: %u, %p\n", msg_type, func);
- ret = -EINVAL;
- goto out;
-
- }
- if (!func) {
- mlog(0, "no message handler provided: %u, %p\n",
- msg_type, func);
- ret = -EINVAL;
- goto out;
- }
-
- nmh = kzalloc(sizeof(struct r2net_msg_handler), GFP_NOFS);
- if (nmh == NULL) {
- ret = -ENOMEM;
- goto out;
- }
-
- nmh->nh_func = func;
- nmh->nh_func_data = data;
- nmh->nh_post_func = post_func;
- nmh->nh_msg_type = msg_type;
- nmh->nh_max_len = max_len;
- nmh->nh_key = key;
- /* the tree and list get this ref.. they're both removed in
- * unregister when this ref is dropped */
- kref_init(&nmh->nh_kref);
- INIT_LIST_HEAD(&nmh->nh_unregister_item);
-
- write_lock(&r2net_handler_lock);
- if (r2net_handler_tree_lookup(msg_type, key, &p, &parent))
- ret = -EEXIST;
- else {
- rb_link_node(&nmh->nh_node, parent, p);
- rb_insert_color(&nmh->nh_node, &r2net_handler_tree);
- list_add_tail(&nmh->nh_unregister_item, unreg_list);
-
- mlog(ML_TCP, "registered handler func %p type %u key %08x\n",
- func, msg_type, key);
- /* we've had some trouble with handlers seemingly vanishing. */
- mlog_bug_on_msg(r2net_handler_tree_lookup(msg_type, key, &p,
- &parent) == NULL,
- "couldn't find handler we *just* registered "
- "for type %u key %08x\n", msg_type, key);
- }
- write_unlock(&r2net_handler_lock);
- if (ret)
- goto out;
-
-out:
- if (ret)
- kfree(nmh);
-
- return ret;
-}
-EXPORT_SYMBOL_GPL(r2net_register_handler);
-
-void r2net_unregister_handler_list(struct list_head *list)
-{
- struct r2net_msg_handler *nmh, *n;
-
- write_lock(&r2net_handler_lock);
- list_for_each_entry_safe(nmh, n, list, nh_unregister_item) {
- mlog(ML_TCP, "unregistering handler func %p type %u key %08x\n",
- nmh->nh_func, nmh->nh_msg_type, nmh->nh_key);
- rb_erase(&nmh->nh_node, &r2net_handler_tree);
- list_del_init(&nmh->nh_unregister_item);
- kref_put(&nmh->nh_kref, r2net_handler_kref_release);
- }
- write_unlock(&r2net_handler_lock);
-}
-EXPORT_SYMBOL_GPL(r2net_unregister_handler_list);
-
-static struct r2net_msg_handler *r2net_handler_get(u32 msg_type, u32 key)
-{
- struct r2net_msg_handler *nmh;
-
- read_lock(&r2net_handler_lock);
- nmh = r2net_handler_tree_lookup(msg_type, key, NULL, NULL);
- if (nmh)
- kref_get(&nmh->nh_kref);
- read_unlock(&r2net_handler_lock);
-
- return nmh;
-}
-
-/* ------------------------------------------------------------ */
-
-static int r2net_recv_tcp_msg(struct socket *sock, void *data, size_t len)
-{
- int ret;
- mm_segment_t oldfs;
- struct kvec vec = {
- .iov_len = len,
- .iov_base = data,
- };
- struct msghdr msg = {
- .msg_iovlen = 1,
- .msg_iov = (struct iovec *)&vec,
- .msg_flags = MSG_DONTWAIT,
- };
-
- oldfs = get_fs();
- set_fs(get_ds());
- ret = sock_recvmsg(sock, &msg, len, msg.msg_flags);
- set_fs(oldfs);
-
- return ret;
-}
-
-static int r2net_send_tcp_msg(struct socket *sock, struct kvec *vec,
- size_t veclen, size_t total)
-{
- int ret;
- mm_segment_t oldfs;
- struct msghdr msg = {
- .msg_iov = (struct iovec *)vec,
- .msg_iovlen = veclen,
- };
-
- if (sock == NULL) {
- ret = -EINVAL;
- goto out;
- }
-
- oldfs = get_fs();
- set_fs(get_ds());
- ret = sock_sendmsg(sock, &msg, total);
- set_fs(oldfs);
- if (ret != total) {
- mlog(ML_ERROR, "sendmsg returned %d instead of %zu\n", ret,
- total);
- if (ret >= 0)
- ret = -EPIPE; /* should be smarter, I bet */
- goto out;
- }
-
- ret = 0;
-out:
- if (ret < 0)
- mlog(0, "returning error: %d\n", ret);
- return ret;
-}
-
-static void r2net_sendpage(struct r2net_sock_container *sc,
- void *kmalloced_virt,
- size_t size)
-{
- struct r2net_node *nn = r2net_nn_from_num(sc->sc_node->nd_num);
- ssize_t ret;
-
- while (1) {
- mutex_lock(&sc->sc_send_lock);
- ret = sc->sc_sock->ops->sendpage(sc->sc_sock,
- virt_to_page(kmalloced_virt),
- (long)kmalloced_virt & ~PAGE_MASK,
- size, MSG_DONTWAIT);
- mutex_unlock(&sc->sc_send_lock);
- if (ret == size)
- break;
- if (ret == (ssize_t)-EAGAIN) {
- mlog(0, "sendpage of size %zu to " SC_NODEF_FMT
- " returned EAGAIN\n", size, sc->sc_node->nd_name,
- sc->sc_node->nd_num,
- &sc->sc_node->nd_ipv4_address,
- ntohs(sc->sc_node->nd_ipv4_port));
- cond_resched();
- continue;
- }
- mlog(ML_ERROR, "sendpage of size %zu to " SC_NODEF_FMT
- " failed with %zd\n", size, sc->sc_node->nd_name,
- sc->sc_node->nd_num, &sc->sc_node->nd_ipv4_address,
- ntohs(sc->sc_node->nd_ipv4_port), ret);
- r2net_ensure_shutdown(nn, sc, 0);
- break;
- }
-}
-
-static void r2net_init_msg(struct r2net_msg *msg, u16 data_len,
- u16 msg_type, u32 key)
-{
- memset(msg, 0, sizeof(struct r2net_msg));
- msg->magic = cpu_to_be16(R2NET_MSG_MAGIC);
- msg->data_len = cpu_to_be16(data_len);
- msg->msg_type = cpu_to_be16(msg_type);
- msg->sys_status = cpu_to_be32(R2NET_ERR_NONE);
- msg->status = 0;
- msg->key = cpu_to_be32(key);
-}
-
-static int r2net_tx_can_proceed(struct r2net_node *nn,
- struct r2net_sock_container **sc_ret,
- int *error)
-{
- int ret = 0;
-
- spin_lock(&nn->nn_lock);
- if (nn->nn_persistent_error) {
- ret = 1;
- *sc_ret = NULL;
- *error = nn->nn_persistent_error;
- } else if (nn->nn_sc_valid) {
- kref_get(&nn->nn_sc->sc_kref);
-
- ret = 1;
- *sc_ret = nn->nn_sc;
- *error = 0;
- }
- spin_unlock(&nn->nn_lock);
-
- return ret;
-}
-
-/* Get a map of all nodes to which this node is currently connected to */
-void r2net_fill_node_map(unsigned long *map, unsigned bytes)
-{
- struct r2net_sock_container *sc;
- int node, ret;
-
- BUG_ON(bytes < (BITS_TO_LONGS(R2NM_MAX_NODES) * sizeof(unsigned long)));
-
- memset(map, 0, bytes);
- for (node = 0; node < R2NM_MAX_NODES; ++node) {
- r2net_tx_can_proceed(r2net_nn_from_num(node), &sc, &ret);
- if (!ret) {
- set_bit(node, map);
- sc_put(sc);
- }
- }
-}
-EXPORT_SYMBOL_GPL(r2net_fill_node_map);
-
-int r2net_send_message_vec(u32 msg_type, u32 key, struct kvec *caller_vec,
- size_t caller_veclen, u8 target_node, int *status)
-{
- int ret = 0;
- struct r2net_msg *msg = NULL;
- size_t veclen, caller_bytes = 0;
- struct kvec *vec = NULL;
- struct r2net_sock_container *sc = NULL;
- struct r2net_node *nn = r2net_nn_from_num(target_node);
- struct r2net_status_wait nsw = {
- .ns_node_item = LIST_HEAD_INIT(nsw.ns_node_item),
- };
- struct r2net_send_tracking nst;
-
- /* this may be a general bug fix */
- init_waitqueue_head(&nsw.ns_wq);
-
- r2net_init_nst(&nst, msg_type, key, current, target_node);
-
- if (r2net_wq == NULL) {
- mlog(0, "attempt to tx without r2netd running\n");
- ret = -ESRCH;
- goto out;
- }
-
- if (caller_veclen == 0) {
- mlog(0, "bad kvec array length\n");
- ret = -EINVAL;
- goto out;
- }
-
- caller_bytes = iov_length((struct iovec *)caller_vec, caller_veclen);
- if (caller_bytes > R2NET_MAX_PAYLOAD_BYTES) {
- mlog(0, "total payload len %zu too large\n", caller_bytes);
- ret = -EINVAL;
- goto out;
- }
-
- if (target_node == r2nm_this_node()) {
- ret = -ELOOP;
- goto out;
- }
-
- r2net_debug_add_nst(&nst);
-
- r2net_set_nst_sock_time(&nst);
-
- wait_event(nn->nn_sc_wq, r2net_tx_can_proceed(nn, &sc, &ret));
- if (ret)
- goto out;
-
- r2net_set_nst_sock_container(&nst, sc);
-
- veclen = caller_veclen + 1;
- vec = kmalloc(sizeof(struct kvec) * veclen, GFP_ATOMIC);
- if (vec == NULL) {
- mlog(0, "failed to %zu element kvec!\n", veclen);
- ret = -ENOMEM;
- goto out;
- }
-
- msg = kmalloc(sizeof(struct r2net_msg), GFP_ATOMIC);
- if (!msg) {
- mlog(0, "failed to allocate a r2net_msg!\n");
- ret = -ENOMEM;
- goto out;
- }
-
- r2net_init_msg(msg, caller_bytes, msg_type, key);
-
- vec[0].iov_len = sizeof(struct r2net_msg);
- vec[0].iov_base = msg;
- memcpy(&vec[1], caller_vec, caller_veclen * sizeof(struct kvec));
-
- ret = r2net_prep_nsw(nn, &nsw);
- if (ret)
- goto out;
-
- msg->msg_num = cpu_to_be32(nsw.ns_id);
- r2net_set_nst_msg_id(&nst, nsw.ns_id);
-
- r2net_set_nst_send_time(&nst);
-
- /* finally, convert the message header to network byte-order
- * and send */
- mutex_lock(&sc->sc_send_lock);
- ret = r2net_send_tcp_msg(sc->sc_sock, vec, veclen,
- sizeof(struct r2net_msg) + caller_bytes);
- mutex_unlock(&sc->sc_send_lock);
- msglog(msg, "sending returned %d\n", ret);
- if (ret < 0) {
- mlog(0, "error returned from r2net_send_tcp_msg=%d\n", ret);
- goto out;
- }
-
- /* wait on other node's handler */
- r2net_set_nst_status_time(&nst);
- wait_event(nsw.ns_wq, r2net_nsw_completed(nn, &nsw));
-
- r2net_update_send_stats(&nst, sc);
-
- /* Note that we avoid overwriting the callers status return
- * variable if a system error was reported on the other
- * side. Callers beware. */
- ret = r2net_sys_err_to_errno(nsw.ns_sys_status);
- if (status && !ret)
- *status = nsw.ns_status;
-
- mlog(0, "woken, returning system status %d, user status %d\n",
- ret, nsw.ns_status);
-out:
- r2net_debug_del_nst(&nst); /* must be before dropping sc and node */
- if (sc)
- sc_put(sc);
- kfree(vec);
- kfree(msg);
- r2net_complete_nsw(nn, &nsw, 0, 0, 0);
- return ret;
-}
-EXPORT_SYMBOL_GPL(r2net_send_message_vec);
-
-int r2net_send_message(u32 msg_type, u32 key, void *data, u32 len,
- u8 target_node, int *status)
-{
- struct kvec vec = {
- .iov_base = data,
- .iov_len = len,
- };
- return r2net_send_message_vec(msg_type, key, &vec, 1,
- target_node, status);
-}
-EXPORT_SYMBOL_GPL(r2net_send_message);
-
-static int r2net_send_status_magic(struct socket *sock, struct r2net_msg *hdr,
- enum r2net_system_error syserr, int err)
-{
- struct kvec vec = {
- .iov_base = hdr,
- .iov_len = sizeof(struct r2net_msg),
- };
-
- BUG_ON(syserr >= R2NET_ERR_MAX);
-
- /* leave other fields intact from the incoming message, msg_num
- * in particular */
- hdr->sys_status = cpu_to_be32(syserr);
- hdr->status = cpu_to_be32(err);
- /* twiddle the magic */
- hdr->magic = cpu_to_be16(R2NET_MSG_STATUS_MAGIC);
- hdr->data_len = 0;
-
- msglog(hdr, "about to send status magic %d\n", err);
- /* hdr has been in host byteorder this whole time */
- return r2net_send_tcp_msg(sock, &vec, 1, sizeof(struct r2net_msg));
-}
-
-/*
- * "data magic" is a long version of "status magic" where the message
- * payload actually contains data to be passed in reply to certain messages
- */
-static int r2net_send_data_magic(struct r2net_sock_container *sc,
- struct r2net_msg *hdr,
- void *data, size_t data_len,
- enum r2net_system_error syserr, int err)
-{
- struct kvec vec[2];
- int ret;
-
- vec[0].iov_base = hdr;
- vec[0].iov_len = sizeof(struct r2net_msg);
- vec[1].iov_base = data;
- vec[1].iov_len = data_len;
-
- BUG_ON(syserr >= R2NET_ERR_MAX);
-
- /* leave other fields intact from the incoming message, msg_num
- * in particular */
- hdr->sys_status = cpu_to_be32(syserr);
- hdr->status = cpu_to_be32(err);
- hdr->magic = cpu_to_be16(R2NET_MSG_DATA_MAGIC); /* twiddle magic */
- hdr->data_len = cpu_to_be16(data_len);
-
- msglog(hdr, "about to send data magic %d\n", err);
- /* hdr has been in host byteorder this whole time */
- ret = r2net_send_tcp_msg(sc->sc_sock, vec, 2,
- sizeof(struct r2net_msg) + data_len);
- return ret;
-}
-
-/*
- * called by a message handler to convert an otherwise normal reply
- * message into a "data magic" message
- */
-void r2net_force_data_magic(struct r2net_msg *hdr, u16 msgtype, u32 msgkey)
-{
- hdr->magic = cpu_to_be16(R2NET_MSG_DATA_MAGIC);
- hdr->msg_type = cpu_to_be16(msgtype);
- hdr->key = cpu_to_be32(msgkey);
-}
-
-/* this returns -errno if the header was unknown or too large, etc.
- * after this is called the buffer us reused for the next message */
-static int r2net_process_message(struct r2net_sock_container *sc,
- struct r2net_msg *hdr)
-{
- struct r2net_node *nn = r2net_nn_from_num(sc->sc_node->nd_num);
- int ret = 0, handler_status;
- enum r2net_system_error syserr;
- struct r2net_msg_handler *nmh = NULL;
- void *ret_data = NULL;
- int data_magic = 0;
-
- msglog(hdr, "processing message\n");
-
- r2net_sc_postpone_idle(sc);
-
- switch (be16_to_cpu(hdr->magic)) {
-
- case R2NET_MSG_STATUS_MAGIC:
- /* special type for returning message status */
- r2net_complete_nsw(nn, NULL, be32_to_cpu(hdr->msg_num),
- be32_to_cpu(hdr->sys_status),
- be32_to_cpu(hdr->status));
- goto out;
- case R2NET_MSG_KEEP_REQ_MAGIC:
- r2net_sendpage(sc, r2net_keep_resp, sizeof(*r2net_keep_resp));
- goto out;
- case R2NET_MSG_KEEP_RESP_MAGIC:
- goto out;
- case R2NET_MSG_MAGIC:
- break;
- case R2NET_MSG_DATA_MAGIC:
- /*
- * unlike a normal status magic, a data magic DOES
- * (MUST) have a handler, so the control flow is
- * a little funky here as a result
- */
- data_magic = 1;
- break;
- default:
- msglog(hdr, "bad magic\n");
- ret = -EINVAL;
- goto out;
- break;
- }
-
- /* find a handler for it */
- handler_status = 0;
- nmh = r2net_handler_get(be16_to_cpu(hdr->msg_type),
- be32_to_cpu(hdr->key));
- if (!nmh) {
- mlog(ML_TCP, "couldn't find handler for type %u key %08x\n",
- be16_to_cpu(hdr->msg_type), be32_to_cpu(hdr->key));
- syserr = R2NET_ERR_NO_HNDLR;
- goto out_respond;
- }
-
- syserr = R2NET_ERR_NONE;
-
- if (be16_to_cpu(hdr->data_len) > nmh->nh_max_len)
- syserr = R2NET_ERR_OVERFLOW;
-
- if (syserr != R2NET_ERR_NONE)
- goto out_respond;
-
- r2net_set_func_start_time(sc);
- sc->sc_msg_key = be32_to_cpu(hdr->key);
- sc->sc_msg_type = be16_to_cpu(hdr->msg_type);
- handler_status = (nmh->nh_func)(hdr, sizeof(struct r2net_msg) +
- be16_to_cpu(hdr->data_len),
- nmh->nh_func_data, &ret_data);
- if (data_magic) {
- /*
- * handler handled data sent in reply to request
- * so complete the transaction
- */
- r2net_complete_nsw(nn, NULL, be32_to_cpu(hdr->msg_num),
- be32_to_cpu(hdr->sys_status), handler_status);
- goto out;
- }
- /*
- * handler changed magic to DATA_MAGIC to reply to request for data,
- * implies ret_data points to data to return and handler_status
- * is the number of bytes of data
- */
- if (be16_to_cpu(hdr->magic) == R2NET_MSG_DATA_MAGIC) {
- ret = r2net_send_data_magic(sc, hdr,
- ret_data, handler_status,
- syserr, 0);
- hdr = NULL;
- mlog(0, "sending data reply %d, syserr %d returned %d\n",
- handler_status, syserr, ret);
- r2net_set_func_stop_time(sc);
-
- r2net_update_recv_stats(sc);
- goto out;
- }
- r2net_set_func_stop_time(sc);
-
- r2net_update_recv_stats(sc);
-
-out_respond:
- /* this destroys the hdr, so don't use it after this */
- mutex_lock(&sc->sc_send_lock);
- ret = r2net_send_status_magic(sc->sc_sock, hdr, syserr,
- handler_status);
- mutex_unlock(&sc->sc_send_lock);
- hdr = NULL;
- mlog(0, "sending handler status %d, syserr %d returned %d\n",
- handler_status, syserr, ret);
-
- if (nmh) {
- BUG_ON(ret_data != NULL && nmh->nh_post_func == NULL);
- if (nmh->nh_post_func)
- (nmh->nh_post_func)(handler_status, nmh->nh_func_data,
- ret_data);
- }
-
-out:
- if (nmh)
- r2net_handler_put(nmh);
- return ret;
-}
-
-static int r2net_check_handshake(struct r2net_sock_container *sc)
-{
- struct r2net_handshake *hand = page_address(sc->sc_page);
- struct r2net_node *nn = r2net_nn_from_num(sc->sc_node->nd_num);
-
- if (hand->protocol_version != cpu_to_be64(R2NET_PROTOCOL_VERSION)) {
- printk(KERN_NOTICE "ramster: " SC_NODEF_FMT " Advertised net "
- "protocol version %llu but %llu is required. "
- "Disconnecting.\n", sc->sc_node->nd_name,
- sc->sc_node->nd_num, &sc->sc_node->nd_ipv4_address,
- ntohs(sc->sc_node->nd_ipv4_port),
- (unsigned long long)be64_to_cpu(hand->protocol_version),
- R2NET_PROTOCOL_VERSION);
-
- /* don't bother reconnecting if its the wrong version. */
- r2net_ensure_shutdown(nn, sc, -ENOTCONN);
- return -1;
- }
-
- /*
- * Ensure timeouts are consistent with other nodes, otherwise
- * we can end up with one node thinking that the other must be down,
- * but isn't. This can ultimately cause corruption.
- */
- if (be32_to_cpu(hand->r2net_idle_timeout_ms) !=
- r2net_idle_timeout()) {
- printk(KERN_NOTICE "ramster: " SC_NODEF_FMT " uses a network "
- "idle timeout of %u ms, but we use %u ms locally. "
- "Disconnecting.\n", sc->sc_node->nd_name,
- sc->sc_node->nd_num, &sc->sc_node->nd_ipv4_address,
- ntohs(sc->sc_node->nd_ipv4_port),
- be32_to_cpu(hand->r2net_idle_timeout_ms),
- r2net_idle_timeout());
- r2net_ensure_shutdown(nn, sc, -ENOTCONN);
- return -1;
- }
-
- if (be32_to_cpu(hand->r2net_keepalive_delay_ms) !=
- r2net_keepalive_delay()) {
- printk(KERN_NOTICE "ramster: " SC_NODEF_FMT " uses a keepalive "
- "delay of %u ms, but we use %u ms locally. "
- "Disconnecting.\n", sc->sc_node->nd_name,
- sc->sc_node->nd_num, &sc->sc_node->nd_ipv4_address,
- ntohs(sc->sc_node->nd_ipv4_port),
- be32_to_cpu(hand->r2net_keepalive_delay_ms),
- r2net_keepalive_delay());
- r2net_ensure_shutdown(nn, sc, -ENOTCONN);
- return -1;
- }
-
- if (be32_to_cpu(hand->r2hb_heartbeat_timeout_ms) !=
- R2HB_MAX_WRITE_TIMEOUT_MS) {
- printk(KERN_NOTICE "ramster: " SC_NODEF_FMT " uses a heartbeat "
- "timeout of %u ms, but we use %u ms locally. "
- "Disconnecting.\n", sc->sc_node->nd_name,
- sc->sc_node->nd_num, &sc->sc_node->nd_ipv4_address,
- ntohs(sc->sc_node->nd_ipv4_port),
- be32_to_cpu(hand->r2hb_heartbeat_timeout_ms),
- R2HB_MAX_WRITE_TIMEOUT_MS);
- r2net_ensure_shutdown(nn, sc, -ENOTCONN);
- return -1;
- }
-
- sc->sc_handshake_ok = 1;
-
- spin_lock(&nn->nn_lock);
- /* set valid and queue the idle timers only if it hasn't been
- * shut down already */
- if (nn->nn_sc == sc) {
- r2net_sc_reset_idle_timer(sc);
- atomic_set(&nn->nn_timeout, 0);
- r2net_set_nn_state(nn, sc, 1, 0);
- }
- spin_unlock(&nn->nn_lock);
-
- /* shift everything up as though it wasn't there */
- sc->sc_page_off -= sizeof(struct r2net_handshake);
- if (sc->sc_page_off)
- memmove(hand, hand + 1, sc->sc_page_off);
-
- return 0;
-}
-
-/* this demuxes the queued rx bytes into header or payload bits and calls
- * handlers as each full message is read off the socket. it returns -error,
- * == 0 eof, or > 0 for progress made.*/
-static int r2net_advance_rx(struct r2net_sock_container *sc)
-{
- struct r2net_msg *hdr;
- int ret = 0;
- void *data;
- size_t datalen;
-
- sclog(sc, "receiving\n");
- r2net_set_advance_start_time(sc);
-
- if (unlikely(sc->sc_handshake_ok == 0)) {
- if (sc->sc_page_off < sizeof(struct r2net_handshake)) {
- data = page_address(sc->sc_page) + sc->sc_page_off;
- datalen = sizeof(struct r2net_handshake) -
- sc->sc_page_off;
- ret = r2net_recv_tcp_msg(sc->sc_sock, data, datalen);
- if (ret > 0)
- sc->sc_page_off += ret;
- }
-
- if (sc->sc_page_off == sizeof(struct r2net_handshake)) {
- r2net_check_handshake(sc);
- if (unlikely(sc->sc_handshake_ok == 0))
- ret = -EPROTO;
- }
- goto out;
- }
-
- /* do we need more header? */
- if (sc->sc_page_off < sizeof(struct r2net_msg)) {
- data = page_address(sc->sc_page) + sc->sc_page_off;
- datalen = sizeof(struct r2net_msg) - sc->sc_page_off;
- ret = r2net_recv_tcp_msg(sc->sc_sock, data, datalen);
- if (ret > 0) {
- sc->sc_page_off += ret;
- /* only swab incoming here.. we can
- * only get here once as we cross from
- * being under to over */
- if (sc->sc_page_off == sizeof(struct r2net_msg)) {
- hdr = page_address(sc->sc_page);
- if (be16_to_cpu(hdr->data_len) >
- R2NET_MAX_PAYLOAD_BYTES)
- ret = -EOVERFLOW;
- }
- }
- if (ret <= 0)
- goto out;
- }
-
- if (sc->sc_page_off < sizeof(struct r2net_msg)) {
- /* oof, still don't have a header */
- goto out;
- }
-
- /* this was swabbed above when we first read it */
- hdr = page_address(sc->sc_page);
-
- msglog(hdr, "at page_off %zu\n", sc->sc_page_off);
-
- /* do we need more payload? */
- if (sc->sc_page_off - sizeof(struct r2net_msg) <
- be16_to_cpu(hdr->data_len)) {
- /* need more payload */
- data = page_address(sc->sc_page) + sc->sc_page_off;
- datalen = (sizeof(struct r2net_msg) +
- be16_to_cpu(hdr->data_len)) -
- sc->sc_page_off;
- ret = r2net_recv_tcp_msg(sc->sc_sock, data, datalen);
- if (ret > 0)
- sc->sc_page_off += ret;
- if (ret <= 0)
- goto out;
- }
-
- if (sc->sc_page_off - sizeof(struct r2net_msg) ==
- be16_to_cpu(hdr->data_len)) {
- /* we can only get here once, the first time we read
- * the payload.. so set ret to progress if the handler
- * works out. after calling this the message is toast */
- ret = r2net_process_message(sc, hdr);
- if (ret == 0)
- ret = 1;
- sc->sc_page_off = 0;
- }
-
-out:
- sclog(sc, "ret = %d\n", ret);
- r2net_set_advance_stop_time(sc);
- return ret;
-}
-
-/* this work func is triggerd by data ready. it reads until it can read no
- * more. it interprets 0, eof, as fatal. if data_ready hits while we're doing
- * our work the work struct will be marked and we'll be called again. */
-static void r2net_rx_until_empty(struct work_struct *work)
-{
- struct r2net_sock_container *sc =
- container_of(work, struct r2net_sock_container, sc_rx_work);
- int ret;
-
- do {
- ret = r2net_advance_rx(sc);
- } while (ret > 0);
-
- if (ret <= 0 && ret != -EAGAIN) {
- struct r2net_node *nn = r2net_nn_from_num(sc->sc_node->nd_num);
- sclog(sc, "saw error %d, closing\n", ret);
- /* not permanent so read failed handshake can retry */
- r2net_ensure_shutdown(nn, sc, 0);
- }
-
- sc_put(sc);
-}
-
-static int r2net_set_nodelay(struct socket *sock)
-{
- int ret, val = 1;
- mm_segment_t oldfs;
-
- oldfs = get_fs();
- set_fs(KERNEL_DS);
-
- /*
- * Dear unsuspecting programmer,
- *
- * Don't use sock_setsockopt() for SOL_TCP. It doesn't check its level
- * argument and assumes SOL_SOCKET so, say, your TCP_NODELAY will
- * silently turn into SO_DEBUG.
- *
- * Yours,
- * Keeper of hilariously fragile interfaces.
- */
- ret = sock->ops->setsockopt(sock, SOL_TCP, TCP_NODELAY,
- (char __user *)&val, sizeof(val));
-
- set_fs(oldfs);
- return ret;
-}
-
-static void r2net_initialize_handshake(void)
-{
- r2net_hand->r2hb_heartbeat_timeout_ms = cpu_to_be32(
- R2HB_MAX_WRITE_TIMEOUT_MS);
- r2net_hand->r2net_idle_timeout_ms = cpu_to_be32(r2net_idle_timeout());
- r2net_hand->r2net_keepalive_delay_ms = cpu_to_be32(
- r2net_keepalive_delay());
- r2net_hand->r2net_reconnect_delay_ms = cpu_to_be32(
- r2net_reconnect_delay());
-}
-
-/* ------------------------------------------------------------ */
-
-/* called when a connect completes and after a sock is accepted. the
- * rx path will see the response and mark the sc valid */
-static void r2net_sc_connect_completed(struct work_struct *work)
-{
- struct r2net_sock_container *sc =
- container_of(work, struct r2net_sock_container,
- sc_connect_work);
-
- mlog(ML_MSG, "sc sending handshake with ver %llu id %llx\n",
- (unsigned long long)R2NET_PROTOCOL_VERSION,
- (unsigned long long)be64_to_cpu(r2net_hand->connector_id));
-
- r2net_initialize_handshake();
- r2net_sendpage(sc, r2net_hand, sizeof(*r2net_hand));
- sc_put(sc);
-}
-
-/* this is called as a work_struct func. */
-static void r2net_sc_send_keep_req(struct work_struct *work)
-{
- struct r2net_sock_container *sc =
- container_of(work, struct r2net_sock_container,
- sc_keepalive_work.work);
-
- r2net_sendpage(sc, r2net_keep_req, sizeof(*r2net_keep_req));
- sc_put(sc);
-}
-
-/* socket shutdown does a del_timer_sync against this as it tears down.
- * we can't start this timer until we've got to the point in sc buildup
- * where shutdown is going to be involved */
-static void r2net_idle_timer(unsigned long data)
-{
- struct r2net_sock_container *sc = (struct r2net_sock_container *)data;
-#ifdef CONFIG_DEBUG_FS
- unsigned long msecs = ktime_to_ms(ktime_get()) -
- ktime_to_ms(sc->sc_tv_timer);
-#else
- unsigned long msecs = r2net_idle_timeout();
-#endif
-
- printk(KERN_NOTICE "ramster: Connection to " SC_NODEF_FMT " has been "
- "idle for %lu.%lu secs, shutting it down.\n",
- sc->sc_node->nd_name, sc->sc_node->nd_num,
- &sc->sc_node->nd_ipv4_address, ntohs(sc->sc_node->nd_ipv4_port),
- msecs / 1000, msecs % 1000);
-
- /*
- * Initialize the nn_timeout so that the next connection attempt
- * will continue in r2net_start_connect.
- */
- /* Avoid spurious shutdowns... not sure if this is still necessary */
- pr_err("ramster_idle_timer, skipping shutdown work\n");
-#if 0
- /* old code used to do these two lines */
- atomic_set(&nn->nn_timeout, 1);
- r2net_sc_queue_work(sc, &sc->sc_shutdown_work);
-#endif
-}
-
-static void r2net_sc_reset_idle_timer(struct r2net_sock_container *sc)
-{
- r2net_sc_cancel_delayed_work(sc, &sc->sc_keepalive_work);
- r2net_sc_queue_delayed_work(sc, &sc->sc_keepalive_work,
- msecs_to_jiffies(r2net_keepalive_delay()));
- r2net_set_sock_timer(sc);
- mod_timer(&sc->sc_idle_timeout,
- jiffies + msecs_to_jiffies(r2net_idle_timeout()));
-}
-
-static void r2net_sc_postpone_idle(struct r2net_sock_container *sc)
-{
- /* Only push out an existing timer */
- if (timer_pending(&sc->sc_idle_timeout))
- r2net_sc_reset_idle_timer(sc);
-}
-
-/* this work func is kicked whenever a path sets the nn state which doesn't
- * have valid set. This includes seeing hb come up, losing a connection,
- * having a connect attempt fail, etc. This centralizes the logic which decides
- * if a connect attempt should be made or if we should give up and all future
- * transmit attempts should fail */
-static void r2net_start_connect(struct work_struct *work)
-{
- struct r2net_node *nn =
- container_of(work, struct r2net_node, nn_connect_work.work);
- struct r2net_sock_container *sc = NULL;
- struct r2nm_node *node = NULL, *mynode = NULL;
- struct socket *sock = NULL;
- struct sockaddr_in myaddr = {0, }, remoteaddr = {0, };
- int ret = 0, stop;
- unsigned int timeout;
-
- /* if we're greater we initiate tx, otherwise we accept */
- if (r2nm_this_node() <= r2net_num_from_nn(nn))
- goto out;
-
- /* watch for racing with tearing a node down */
- node = r2nm_get_node_by_num(r2net_num_from_nn(nn));
- if (node == NULL) {
- ret = 0;
- goto out;
- }
-
- mynode = r2nm_get_node_by_num(r2nm_this_node());
- if (mynode == NULL) {
- ret = 0;
- goto out;
- }
-
- spin_lock(&nn->nn_lock);
- /*
- * see if we already have one pending or have given up.
- * For nn_timeout, it is set when we close the connection
- * because of the idle time out. So it means that we have
- * at least connected to that node successfully once,
- * now try to connect to it again.
- */
- timeout = atomic_read(&nn->nn_timeout);
- stop = (nn->nn_sc ||
- (nn->nn_persistent_error &&
- (nn->nn_persistent_error != -ENOTCONN || timeout == 0)));
- spin_unlock(&nn->nn_lock);
- if (stop)
- goto out;
-
- nn->nn_last_connect_attempt = jiffies;
-
- sc = sc_alloc(node);
- if (sc == NULL) {
- mlog(0, "couldn't allocate sc\n");
- ret = -ENOMEM;
- goto out;
- }
-
- ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
- if (ret < 0) {
- mlog(0, "can't create socket: %d\n", ret);
- goto out;
- }
- sc->sc_sock = sock; /* freed by sc_kref_release */
-
- sock->sk->sk_allocation = GFP_ATOMIC;
-
- myaddr.sin_family = AF_INET;
- myaddr.sin_addr.s_addr = mynode->nd_ipv4_address;
- myaddr.sin_port = htons(0); /* any port */
-
- ret = sock->ops->bind(sock, (struct sockaddr *)&myaddr,
- sizeof(myaddr));
- if (ret) {
- mlog(ML_ERROR, "bind failed with %d at address %pI4\n",
- ret, &mynode->nd_ipv4_address);
- goto out;
- }
-
- ret = r2net_set_nodelay(sc->sc_sock);
- if (ret) {
- mlog(ML_ERROR, "setting TCP_NODELAY failed with %d\n", ret);
- goto out;
- }
-
- r2net_register_callbacks(sc->sc_sock->sk, sc);
-
- spin_lock(&nn->nn_lock);
- /* handshake completion will set nn->nn_sc_valid */
- r2net_set_nn_state(nn, sc, 0, 0);
- spin_unlock(&nn->nn_lock);
-
- remoteaddr.sin_family = AF_INET;
- remoteaddr.sin_addr.s_addr = node->nd_ipv4_address;
- remoteaddr.sin_port = node->nd_ipv4_port;
-
- ret = sc->sc_sock->ops->connect(sc->sc_sock,
- (struct sockaddr *)&remoteaddr,
- sizeof(remoteaddr),
- O_NONBLOCK);
- if (ret == -EINPROGRESS)
- ret = 0;
-
-out:
- if (ret) {
- printk(KERN_NOTICE "ramster: Connect attempt to " SC_NODEF_FMT
- " failed with errno %d\n", sc->sc_node->nd_name,
- sc->sc_node->nd_num, &sc->sc_node->nd_ipv4_address,
- ntohs(sc->sc_node->nd_ipv4_port), ret);
- /* 0 err so that another will be queued and attempted
- * from set_nn_state */
- if (sc)
- r2net_ensure_shutdown(nn, sc, 0);
- }
- if (sc)
- sc_put(sc);
- if (node)
- r2nm_node_put(node);
- if (mynode)
- r2nm_node_put(mynode);
-
- return;
-}
-
-static void r2net_connect_expired(struct work_struct *work)
-{
- struct r2net_node *nn =
- container_of(work, struct r2net_node, nn_connect_expired.work);
-
- spin_lock(&nn->nn_lock);
- if (!nn->nn_sc_valid) {
- printk(KERN_NOTICE "ramster: No connection established with "
- "node %u after %u.%u seconds, giving up.\n",
- r2net_num_from_nn(nn),
- r2net_idle_timeout() / 1000,
- r2net_idle_timeout() % 1000);
-
- r2net_set_nn_state(nn, NULL, 0, -ENOTCONN);
- }
- spin_unlock(&nn->nn_lock);
-}
-
-static void r2net_still_up(struct work_struct *work)
-{
-}
-
-/* ------------------------------------------------------------ */
-
-void r2net_disconnect_node(struct r2nm_node *node)
-{
- struct r2net_node *nn = r2net_nn_from_num(node->nd_num);
-
- /* don't reconnect until it's heartbeating again */
- spin_lock(&nn->nn_lock);
- atomic_set(&nn->nn_timeout, 0);
- r2net_set_nn_state(nn, NULL, 0, -ENOTCONN);
- spin_unlock(&nn->nn_lock);
-
- if (r2net_wq) {
- cancel_delayed_work(&nn->nn_connect_expired);
- cancel_delayed_work(&nn->nn_connect_work);
- cancel_delayed_work(&nn->nn_still_up);
- flush_workqueue(r2net_wq);
- }
-}
-
-static void r2net_hb_node_down_cb(struct r2nm_node *node, int node_num,
- void *data)
-{
- if (!node)
- return;
-
- if (node_num != r2nm_this_node())
- r2net_disconnect_node(node);
-
- BUG_ON(atomic_read(&r2net_connected_peers) < 0);
-}
-
-static void r2net_hb_node_up_cb(struct r2nm_node *node, int node_num,
- void *data)
-{
- struct r2net_node *nn = r2net_nn_from_num(node_num);
-
- BUG_ON(!node);
-
- /* ensure an immediate connect attempt */
- nn->nn_last_connect_attempt = jiffies -
- (msecs_to_jiffies(r2net_reconnect_delay()) + 1);
-
- if (node_num != r2nm_this_node()) {
- /* believe it or not, accept and node hearbeating testing
- * can succeed for this node before we got here.. so
- * only use set_nn_state to clear the persistent error
- * if that hasn't already happened */
- spin_lock(&nn->nn_lock);
- atomic_set(&nn->nn_timeout, 0);
- if (nn->nn_persistent_error)
- r2net_set_nn_state(nn, NULL, 0, 0);
- spin_unlock(&nn->nn_lock);
- }
-}
-
-void r2net_unregister_hb_callbacks(void)
-{
- r2hb_unregister_callback(NULL, &r2net_hb_up);
- r2hb_unregister_callback(NULL, &r2net_hb_down);
-}
-
-int r2net_register_hb_callbacks(void)
-{
- int ret;
-
- r2hb_setup_callback(&r2net_hb_down, R2HB_NODE_DOWN_CB,
- r2net_hb_node_down_cb, NULL, R2NET_HB_PRI);
- r2hb_setup_callback(&r2net_hb_up, R2HB_NODE_UP_CB,
- r2net_hb_node_up_cb, NULL, R2NET_HB_PRI);
-
- ret = r2hb_register_callback(NULL, &r2net_hb_up);
- if (ret == 0)
- ret = r2hb_register_callback(NULL, &r2net_hb_down);
-
- if (ret)
- r2net_unregister_hb_callbacks();
-
- return ret;
-}
-
-/* ------------------------------------------------------------ */
-
-static int r2net_accept_one(struct socket *sock)
-{
- int ret, slen;
- struct sockaddr_in sin;
- struct socket *new_sock = NULL;
- struct r2nm_node *node = NULL;
- struct r2nm_node *local_node = NULL;
- struct r2net_sock_container *sc = NULL;
- struct r2net_node *nn;
-
- BUG_ON(sock == NULL);
- ret = sock_create_lite(sock->sk->sk_family, sock->sk->sk_type,
- sock->sk->sk_protocol, &new_sock);
- if (ret)
- goto out;
-
- new_sock->type = sock->type;
- new_sock->ops = sock->ops;
- ret = sock->ops->accept(sock, new_sock, O_NONBLOCK);
- if (ret < 0)
- goto out;
-
- new_sock->sk->sk_allocation = GFP_ATOMIC;
-
- ret = r2net_set_nodelay(new_sock);
- if (ret) {
- mlog(ML_ERROR, "setting TCP_NODELAY failed with %d\n", ret);
- goto out;
- }
-
- slen = sizeof(sin);
- ret = new_sock->ops->getname(new_sock, (struct sockaddr *) &sin,
- &slen, 1);
- if (ret < 0)
- goto out;
-
- node = r2nm_get_node_by_ip(sin.sin_addr.s_addr);
- if (node == NULL) {
- printk(KERN_NOTICE "ramster: Attempt to connect from unknown "
- "node at %pI4:%d\n", &sin.sin_addr.s_addr,
- ntohs(sin.sin_port));
- ret = -EINVAL;
- goto out;
- }
-
- if (r2nm_this_node() >= node->nd_num) {
- local_node = r2nm_get_node_by_num(r2nm_this_node());
- printk(KERN_NOTICE "ramster: Unexpected connect attempt seen "
- "at node '%s' (%u, %pI4:%d) from node '%s' (%u, "
- "%pI4:%d)\n", local_node->nd_name, local_node->nd_num,
- &(local_node->nd_ipv4_address),
- ntohs(local_node->nd_ipv4_port), node->nd_name,
- node->nd_num, &sin.sin_addr.s_addr, ntohs(sin.sin_port));
- ret = -EINVAL;
- goto out;
- }
-
- /* this happens all the time when the other node sees our heartbeat
- * and tries to connect before we see their heartbeat */
- if (!r2hb_check_node_heartbeating_from_callback(node->nd_num)) {
- mlog(ML_CONN, "attempt to connect from node '%s' at "
- "%pI4:%d but it isn't heartbeating\n",
- node->nd_name, &sin.sin_addr.s_addr,
- ntohs(sin.sin_port));
- ret = -EINVAL;
- goto out;
- }
-
- nn = r2net_nn_from_num(node->nd_num);
-
- spin_lock(&nn->nn_lock);
- if (nn->nn_sc)
- ret = -EBUSY;
- else
- ret = 0;
- spin_unlock(&nn->nn_lock);
- if (ret) {
- printk(KERN_NOTICE "ramster: Attempt to connect from node '%s' "
- "at %pI4:%d but it already has an open connection\n",
- node->nd_name, &sin.sin_addr.s_addr,
- ntohs(sin.sin_port));
- goto out;
- }
-
- sc = sc_alloc(node);
- if (sc == NULL) {
- ret = -ENOMEM;
- goto out;
- }
-
- sc->sc_sock = new_sock;
- new_sock = NULL;
-
- spin_lock(&nn->nn_lock);
- atomic_set(&nn->nn_timeout, 0);
- r2net_set_nn_state(nn, sc, 0, 0);
- spin_unlock(&nn->nn_lock);
-
- r2net_register_callbacks(sc->sc_sock->sk, sc);
- r2net_sc_queue_work(sc, &sc->sc_rx_work);
-
- r2net_initialize_handshake();
- r2net_sendpage(sc, r2net_hand, sizeof(*r2net_hand));
-
-out:
- if (new_sock)
- sock_release(new_sock);
- if (node)
- r2nm_node_put(node);
- if (local_node)
- r2nm_node_put(local_node);
- if (sc)
- sc_put(sc);
- return ret;
-}
-
-static void r2net_accept_many(struct work_struct *work)
-{
- struct socket *sock = r2net_listen_sock;
- while (r2net_accept_one(sock) == 0)
- cond_resched();
-}
-
-static void r2net_listen_data_ready(struct sock *sk, int bytes)
-{
- void (*ready)(struct sock *sk, int bytes);
-
- read_lock(&sk->sk_callback_lock);
- ready = sk->sk_user_data;
- if (ready == NULL) { /* check for teardown race */
- ready = sk->sk_data_ready;
- goto out;
- }
-
- /* ->sk_data_ready is also called for a newly established child socket
- * before it has been accepted and the acceptor has set up their
- * data_ready.. we only want to queue listen work for our listening
- * socket */
- if (sk->sk_state == TCP_LISTEN) {
- mlog(ML_TCP, "bytes: %d\n", bytes);
- queue_work(r2net_wq, &r2net_listen_work);
- }
-
-out:
- read_unlock(&sk->sk_callback_lock);
- ready(sk, bytes);
-}
-
-static int r2net_open_listening_sock(__be32 addr, __be16 port)
-{
- struct socket *sock = NULL;
- int ret;
- struct sockaddr_in sin = {
- .sin_family = PF_INET,
- .sin_addr = { .s_addr = addr },
- .sin_port = port,
- };
-
- ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
- if (ret < 0) {
- printk(KERN_ERR "ramster: Error %d while creating socket\n",
- ret);
- goto out;
- }
-
- sock->sk->sk_allocation = GFP_ATOMIC;
-
- write_lock_bh(&sock->sk->sk_callback_lock);
- sock->sk->sk_user_data = sock->sk->sk_data_ready;
- sock->sk->sk_data_ready = r2net_listen_data_ready;
- write_unlock_bh(&sock->sk->sk_callback_lock);
-
- r2net_listen_sock = sock;
- INIT_WORK(&r2net_listen_work, r2net_accept_many);
-
- sock->sk->sk_reuse = SK_CAN_REUSE;
- ret = sock->ops->bind(sock, (struct sockaddr *)&sin, sizeof(sin));
- if (ret < 0) {
- printk(KERN_ERR "ramster: Error %d while binding socket at "
- "%pI4:%u\n", ret, &addr, ntohs(port));
- goto out;
- }
-
- ret = sock->ops->listen(sock, 64);
- if (ret < 0)
- printk(KERN_ERR "ramster: Error %d while listening on %pI4:%u\n",
- ret, &addr, ntohs(port));
-
-out:
- if (ret) {
- r2net_listen_sock = NULL;
- if (sock)
- sock_release(sock);
- }
- return ret;
-}
-
-/*
- * called from node manager when we should bring up our network listening
- * socket. node manager handles all the serialization to only call this
- * once and to match it with r2net_stop_listening(). note,
- * r2nm_this_node() doesn't work yet as we're being called while it
- * is being set up.
- */
-int r2net_start_listening(struct r2nm_node *node)
-{
- int ret = 0;
-
- BUG_ON(r2net_wq != NULL);
- BUG_ON(r2net_listen_sock != NULL);
-
- mlog(ML_KTHREAD, "starting r2net thread...\n");
- r2net_wq = create_singlethread_workqueue("r2net");
- if (r2net_wq == NULL) {
- mlog(ML_ERROR, "unable to launch r2net thread\n");
- return -ENOMEM; /* ? */
- }
-
- ret = r2net_open_listening_sock(node->nd_ipv4_address,
- node->nd_ipv4_port);
- if (ret) {
- destroy_workqueue(r2net_wq);
- r2net_wq = NULL;
- }
-
- return ret;
-}
-
-/* again, r2nm_this_node() doesn't work here as we're involved in
- * tearing it down */
-void r2net_stop_listening(struct r2nm_node *node)
-{
- struct socket *sock = r2net_listen_sock;
- size_t i;
-
- BUG_ON(r2net_wq == NULL);
- BUG_ON(r2net_listen_sock == NULL);
-
- /* stop the listening socket from generating work */
- write_lock_bh(&sock->sk->sk_callback_lock);
- sock->sk->sk_data_ready = sock->sk->sk_user_data;
- sock->sk->sk_user_data = NULL;
- write_unlock_bh(&sock->sk->sk_callback_lock);
-
- for (i = 0; i < ARRAY_SIZE(r2net_nodes); i++) {
- struct r2nm_node *node = r2nm_get_node_by_num(i);
- if (node) {
- r2net_disconnect_node(node);
- r2nm_node_put(node);
- }
- }
-
- /* finish all work and tear down the work queue */
- mlog(ML_KTHREAD, "waiting for r2net thread to exit....\n");
- destroy_workqueue(r2net_wq);
- r2net_wq = NULL;
-
- sock_release(r2net_listen_sock);
- r2net_listen_sock = NULL;
-}
-
-void r2net_hb_node_up_manual(int node_num)
-{
- struct r2nm_node dummy;
- if (r2nm_single_cluster == NULL)
- pr_err("ramster: cluster not alive, node_up_manual ignored\n");
- else {
- r2hb_manual_set_node_heartbeating(node_num);
- r2net_hb_node_up_cb(&dummy, node_num, NULL);
- }
-}
-
-/* ------------------------------------------------------------ */
-
-int r2net_init(void)
-{
- unsigned long i;
-
- if (r2net_debugfs_init())
- return -ENOMEM;
-
- r2net_hand = kzalloc(sizeof(struct r2net_handshake), GFP_KERNEL);
- r2net_keep_req = kzalloc(sizeof(struct r2net_msg), GFP_KERNEL);
- r2net_keep_resp = kzalloc(sizeof(struct r2net_msg), GFP_KERNEL);
- if (!r2net_hand || !r2net_keep_req || !r2net_keep_resp) {
- kfree(r2net_hand);
- kfree(r2net_keep_req);
- kfree(r2net_keep_resp);
- return -ENOMEM;
- }
-
- r2net_hand->protocol_version = cpu_to_be64(R2NET_PROTOCOL_VERSION);
- r2net_hand->connector_id = cpu_to_be64(1);
-
- r2net_keep_req->magic = cpu_to_be16(R2NET_MSG_KEEP_REQ_MAGIC);
- r2net_keep_resp->magic = cpu_to_be16(R2NET_MSG_KEEP_RESP_MAGIC);
-
- for (i = 0; i < ARRAY_SIZE(r2net_nodes); i++) {
- struct r2net_node *nn = r2net_nn_from_num(i);
-
- atomic_set(&nn->nn_timeout, 0);
- spin_lock_init(&nn->nn_lock);
- INIT_DELAYED_WORK(&nn->nn_connect_work, r2net_start_connect);
- INIT_DELAYED_WORK(&nn->nn_connect_expired,
- r2net_connect_expired);
- INIT_DELAYED_WORK(&nn->nn_still_up, r2net_still_up);
- /* until we see hb from a node we'll return einval */
- nn->nn_persistent_error = -ENOTCONN;
- init_waitqueue_head(&nn->nn_sc_wq);
- idr_init(&nn->nn_status_idr);
- INIT_LIST_HEAD(&nn->nn_status_list);
- }
-
- return 0;
-}
-
-void r2net_exit(void)
-{
- kfree(r2net_hand);
- kfree(r2net_keep_req);
- kfree(r2net_keep_resp);
- r2net_debugfs_exit();
-}
diff --git a/drivers/staging/ramster/cluster/tcp.h b/drivers/staging/ramster/cluster/tcp.h
deleted file mode 100644
index 9d05833..0000000
--- a/drivers/staging/ramster/cluster/tcp.h
+++ /dev/null
@@ -1,159 +0,0 @@
-/* -*- mode: c; c-basic-offset: 8; -*-
- * vim: noexpandtab sw=8 ts=8 sts=0:
- *
- * tcp.h
- *
- * Function prototypes
- *
- * Copyright (C) 2004 Oracle. All rights reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public
- * License along with this program; if not, write to the
- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 021110-1307, USA.
- *
- */
-
-#ifndef R2CLUSTER_TCP_H
-#define R2CLUSTER_TCP_H
-
-#include <linux/socket.h>
-#ifdef __KERNEL__
-#include <net/sock.h>
-#include <linux/tcp.h>
-#else
-#include <sys/socket.h>
-#endif
-#include <linux/inet.h>
-#include <linux/in.h>
-
-struct r2net_msg {
- __be16 magic;
- __be16 data_len;
- __be16 msg_type;
- __be16 pad1;
- __be32 sys_status;
- __be32 status;
- __be32 key;
- __be32 msg_num;
- __u8 buf[0];
-};
-
-typedef int (r2net_msg_handler_func)(struct r2net_msg *msg, u32 len, void *data,
- void **ret_data);
-typedef void (r2net_post_msg_handler_func)(int status, void *data,
- void *ret_data);
-
-#define R2NET_MAX_PAYLOAD_BYTES (4096 - sizeof(struct r2net_msg))
-
-/* same as hb delay, we're waiting for another node to recognize our hb */
-#define R2NET_RECONNECT_DELAY_MS_DEFAULT 2000
-
-#define R2NET_KEEPALIVE_DELAY_MS_DEFAULT 2000
-#define R2NET_IDLE_TIMEOUT_MS_DEFAULT 30000
-
-
-/* TODO: figure this out.... */
-static inline int r2net_link_down(int err, struct socket *sock)
-{
- if (sock) {
- if (sock->sk->sk_state != TCP_ESTABLISHED &&
- sock->sk->sk_state != TCP_CLOSE_WAIT)
- return 1;
- }
-
- if (err >= 0)
- return 0;
- switch (err) {
-
- /* ????????????????????????? */
- case -ERESTARTSYS:
- case -EBADF:
- /* When the server has died, an ICMP port unreachable
- * message prompts ECONNREFUSED. */
- case -ECONNREFUSED:
- case -ENOTCONN:
- case -ECONNRESET:
- case -EPIPE:
- return 1;
-
- }
- return 0;
-}
-
-enum {
- R2NET_DRIVER_UNINITED,
- R2NET_DRIVER_READY,
-};
-
-int r2net_send_message(u32 msg_type, u32 key, void *data, u32 len,
- u8 target_node, int *status);
-int r2net_send_message_vec(u32 msg_type, u32 key, struct kvec *vec,
- size_t veclen, u8 target_node, int *status);
-
-int r2net_register_handler(u32 msg_type, u32 key, u32 max_len,
- r2net_msg_handler_func *func, void *data,
- r2net_post_msg_handler_func *post_func,
- struct list_head *unreg_list);
-void r2net_unregister_handler_list(struct list_head *list);
-
-void r2net_fill_node_map(unsigned long *map, unsigned bytes);
-
-void r2net_force_data_magic(struct r2net_msg *, u16, u32);
-void r2net_hb_node_up_manual(int);
-struct r2net_node *r2net_nn_from_num(u8);
-
-struct r2nm_node;
-int r2net_register_hb_callbacks(void);
-void r2net_unregister_hb_callbacks(void);
-int r2net_start_listening(struct r2nm_node *node);
-void r2net_stop_listening(struct r2nm_node *node);
-void r2net_disconnect_node(struct r2nm_node *node);
-int r2net_num_connected_peers(void);
-
-int r2net_init(void);
-void r2net_exit(void);
-
-struct r2net_send_tracking;
-struct r2net_sock_container;
-
-#if 0
-int r2net_debugfs_init(void);
-void r2net_debugfs_exit(void);
-void r2net_debug_add_nst(struct r2net_send_tracking *nst);
-void r2net_debug_del_nst(struct r2net_send_tracking *nst);
-void r2net_debug_add_sc(struct r2net_sock_container *sc);
-void r2net_debug_del_sc(struct r2net_sock_container *sc);
-#else
-static inline int r2net_debugfs_init(void)
-{
- return 0;
-}
-static inline void r2net_debugfs_exit(void)
-{
-}
-static inline void r2net_debug_add_nst(struct r2net_send_tracking *nst)
-{
-}
-static inline void r2net_debug_del_nst(struct r2net_send_tracking *nst)
-{
-}
-static inline void r2net_debug_add_sc(struct r2net_sock_container *sc)
-{
-}
-static inline void r2net_debug_del_sc(struct r2net_sock_container *sc)
-{
-}
-#endif /* CONFIG_DEBUG_FS */
-
-#endif /* R2CLUSTER_TCP_H */
diff --git a/drivers/staging/ramster/cluster/tcp_internal.h b/drivers/staging/ramster/cluster/tcp_internal.h
deleted file mode 100644
index 4d8cc9f..0000000
--- a/drivers/staging/ramster/cluster/tcp_internal.h
+++ /dev/null
@@ -1,248 +0,0 @@
-/* -*- mode: c; c-basic-offset: 8; -*-
- * vim: noexpandtab sw=8 ts=8 sts=0:
- *
- * Copyright (C) 2005 Oracle. All rights reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public
- * License along with this program; if not, write to the
- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 021110-1307, USA.
- */
-
-#ifndef R2CLUSTER_TCP_INTERNAL_H
-#define R2CLUSTER_TCP_INTERNAL_H
-
-#define R2NET_MSG_MAGIC ((u16)0xfa55)
-#define R2NET_MSG_STATUS_MAGIC ((u16)0xfa56)
-#define R2NET_MSG_KEEP_REQ_MAGIC ((u16)0xfa57)
-#define R2NET_MSG_KEEP_RESP_MAGIC ((u16)0xfa58)
-/*
- * "data magic" is a long version of "status magic" where the message
- * payload actually contains data to be passed in reply to certain messages
- */
-#define R2NET_MSG_DATA_MAGIC ((u16)0xfa59)
-
-/* we're delaying our quorum decision so that heartbeat will have timed
- * out truly dead nodes by the time we come around to making decisions
- * on their number */
-#define R2NET_QUORUM_DELAY_MS \
- ((r2hb_dead_threshold + 2) * R2HB_REGION_TIMEOUT_MS)
-
-/*
- * This version number represents quite a lot, unfortunately. It not
- * only represents the raw network message protocol on the wire but also
- * locking semantics of the file system using the protocol. It should
- * be somewhere else, I'm sure, but right now it isn't.
- *
- * With version 11, we separate out the filesystem locking portion. The
- * filesystem now has a major.minor version it negotiates. Version 11
- * introduces this negotiation to the r2dlm protocol, and as such the
- * version here in tcp_internal.h should not need to be bumped for
- * filesystem locking changes.
- *
- * New in version 11
- * - Negotiation of filesystem locking in the dlm join.
- *
- * New in version 10:
- * - Meta/data locks combined
- *
- * New in version 9:
- * - All votes removed
- *
- * New in version 8:
- * - Replace delete inode votes with a cluster lock
- *
- * New in version 7:
- * - DLM join domain includes the live nodemap
- *
- * New in version 6:
- * - DLM lockres remote refcount fixes.
- *
- * New in version 5:
- * - Network timeout checking protocol
- *
- * New in version 4:
- * - Remove i_generation from lock names for better stat performance.
- *
- * New in version 3:
- * - Replace dentry votes with a cluster lock
- *
- * New in version 2:
- * - full 64 bit i_size in the metadata lock lvbs
- * - introduction of "rw" lock and pushing meta/data locking down
- */
-#define R2NET_PROTOCOL_VERSION 11ULL
-struct r2net_handshake {
- __be64 protocol_version;
- __be64 connector_id;
- __be32 r2hb_heartbeat_timeout_ms;
- __be32 r2net_idle_timeout_ms;
- __be32 r2net_keepalive_delay_ms;
- __be32 r2net_reconnect_delay_ms;
-};
-
-struct r2net_node {
- /* this is never called from int/bh */
- spinlock_t nn_lock;
-
- /* set the moment an sc is allocated and a connect is started */
- struct r2net_sock_container *nn_sc;
- /* _valid is only set after the handshake passes and tx can happen */
- unsigned nn_sc_valid:1;
- /* if this is set tx just returns it */
- int nn_persistent_error;
- /* It is only set to 1 after the idle time out. */
- atomic_t nn_timeout;
-
- /* threads waiting for an sc to arrive wait on the wq for generation
- * to increase. it is increased when a connecting socket succeeds
- * or fails or when an accepted socket is attached. */
- wait_queue_head_t nn_sc_wq;
-
- struct idr nn_status_idr;
- struct list_head nn_status_list;
-
- /* connects are attempted from when heartbeat comes up until either hb
- * goes down, the node is unconfigured, no connect attempts succeed
- * before R2NET_CONN_IDLE_DELAY, or a connect succeeds. connect_work
- * is queued from set_nn_state both from hb up and from itself if a
- * connect attempt fails and so can be self-arming. shutdown is
- * careful to first mark the nn such that no connects will be attempted
- * before canceling delayed connect work and flushing the queue. */
- struct delayed_work nn_connect_work;
- unsigned long nn_last_connect_attempt;
-
- /* this is queued as nodes come up and is canceled when a connection is
- * established. this expiring gives up on the node and errors out
- * transmits */
- struct delayed_work nn_connect_expired;
-
- /* after we give up on a socket we wait a while before deciding
- * that it is still heartbeating and that we should do some
- * quorum work */
- struct delayed_work nn_still_up;
-};
-
-struct r2net_sock_container {
- struct kref sc_kref;
- /* the next two are valid for the life time of the sc */
- struct socket *sc_sock;
- struct r2nm_node *sc_node;
-
- /* all of these sc work structs hold refs on the sc while they are
- * queued. they should not be able to ref a freed sc. the teardown
- * race is with r2net_wq destruction in r2net_stop_listening() */
-
- /* rx and connect work are generated from socket callbacks. sc
- * shutdown removes the callbacks and then flushes the work queue */
- struct work_struct sc_rx_work;
- struct work_struct sc_connect_work;
- /* shutdown work is triggered in two ways. the simple way is
- * for a code path calls ensure_shutdown which gets a lock, removes
- * the sc from the nn, and queues the work. in this case the
- * work is single-shot. the work is also queued from a sock
- * callback, though, and in this case the work will find the sc
- * still on the nn and will call ensure_shutdown itself.. this
- * ends up triggering the shutdown work again, though nothing
- * will be done in that second iteration. so work queue teardown
- * has to be careful to remove the sc from the nn before waiting
- * on the work queue so that the shutdown work doesn't remove the
- * sc and rearm itself.
- */
- struct work_struct sc_shutdown_work;
-
- struct timer_list sc_idle_timeout;
- struct delayed_work sc_keepalive_work;
-
- unsigned sc_handshake_ok:1;
-
- struct page *sc_page;
- size_t sc_page_off;
-
- /* original handlers for the sockets */
- void (*sc_state_change)(struct sock *sk);
- void (*sc_data_ready)(struct sock *sk, int bytes);
-
- u32 sc_msg_key;
- u16 sc_msg_type;
-
-#ifdef CONFIG_DEBUG_FS
- struct list_head sc_net_debug_item;
- ktime_t sc_tv_timer;
- ktime_t sc_tv_data_ready;
- ktime_t sc_tv_advance_start;
- ktime_t sc_tv_advance_stop;
- ktime_t sc_tv_func_start;
- ktime_t sc_tv_func_stop;
-#endif
-#ifdef CONFIG_RAMSTER_FS_STATS
- ktime_t sc_tv_acquiry_total;
- ktime_t sc_tv_send_total;
- ktime_t sc_tv_status_total;
- u32 sc_send_count;
- u32 sc_recv_count;
- ktime_t sc_tv_process_total;
-#endif
- struct mutex sc_send_lock;
-};
-
-struct r2net_msg_handler {
- struct rb_node nh_node;
- u32 nh_max_len;
- u32 nh_msg_type;
- u32 nh_key;
- r2net_msg_handler_func *nh_func;
- r2net_msg_handler_func *nh_func_data;
- r2net_post_msg_handler_func
- *nh_post_func;
- struct kref nh_kref;
- struct list_head nh_unregister_item;
-};
-
-enum r2net_system_error {
- R2NET_ERR_NONE = 0,
- R2NET_ERR_NO_HNDLR,
- R2NET_ERR_OVERFLOW,
- R2NET_ERR_DIED,
- R2NET_ERR_MAX
-};
-
-struct r2net_status_wait {
- enum r2net_system_error ns_sys_status;
- s32 ns_status;
- int ns_id;
- wait_queue_head_t ns_wq;
- struct list_head ns_node_item;
-};
-
-#ifdef CONFIG_DEBUG_FS
-/* just for state dumps */
-struct r2net_send_tracking {
- struct list_head st_net_debug_item;
- struct task_struct *st_task;
- struct r2net_sock_container *st_sc;
- u32 st_id;
- u32 st_msg_type;
- u32 st_msg_key;
- u8 st_node;
- ktime_t st_sock_time;
- ktime_t st_send_time;
- ktime_t st_status_time;
-};
-#else
-struct r2net_send_tracking {
- u32 dummy;
-};
-#endif /* CONFIG_DEBUG_FS */
-
-#endif /* R2CLUSTER_TCP_INTERNAL_H */
diff --git a/drivers/staging/ramster/r2net.c b/drivers/staging/ramster/r2net.c
deleted file mode 100644
index 2ee0220..0000000
--- a/drivers/staging/ramster/r2net.c
+++ /dev/null
@@ -1,401 +0,0 @@
-/*
- * r2net.c
- *
- * Copyright (c) 2011, Dan Magenheimer, Oracle Corp.
- *
- * Ramster_r2net provides an interface between zcache and r2net.
- *
- * FIXME: support more than two nodes
- */
-
-#include <linux/list.h>
-#include "cluster/tcp.h"
-#include "cluster/nodemanager.h"
-#include "tmem.h"
-#include "zcache.h"
-#include "ramster.h"
-
-#define RAMSTER_TESTING
-
-#define RMSTR_KEY 0x77347734
-
-enum {
- RMSTR_TMEM_PUT_EPH = 100,
- RMSTR_TMEM_PUT_PERS,
- RMSTR_TMEM_ASYNC_GET_REQUEST,
- RMSTR_TMEM_ASYNC_GET_AND_FREE_REQUEST,
- RMSTR_TMEM_ASYNC_GET_REPLY,
- RMSTR_TMEM_FLUSH,
- RMSTR_TMEM_FLOBJ,
- RMSTR_TMEM_DESTROY_POOL,
-};
-
-#define RMSTR_R2NET_MAX_LEN \
- (R2NET_MAX_PAYLOAD_BYTES - sizeof(struct tmem_xhandle))
-
-#include "cluster/tcp_internal.h"
-
-static struct r2nm_node *r2net_target_node;
-static int r2net_target_nodenum;
-
-int r2net_remote_target_node_set(int node_num)
-{
- int ret = -1;
-
- r2net_target_node = r2nm_get_node_by_num(node_num);
- if (r2net_target_node != NULL) {
- r2net_target_nodenum = node_num;
- r2nm_node_put(r2net_target_node);
- ret = 0;
- }
- return ret;
-}
-
-/* FIXME following buffer should be per-cpu, protected by preempt_disable */
-static char ramster_async_get_buf[R2NET_MAX_PAYLOAD_BYTES];
-
-static int ramster_remote_async_get_request_handler(struct r2net_msg *msg,
- u32 len, void *data, void **ret_data)
-{
- char *pdata;
- struct tmem_xhandle xh;
- int found;
- size_t size = RMSTR_R2NET_MAX_LEN;
- u16 msgtype = be16_to_cpu(msg->msg_type);
- bool get_and_free = (msgtype == RMSTR_TMEM_ASYNC_GET_AND_FREE_REQUEST);
- unsigned long flags;
-
- xh = *(struct tmem_xhandle *)msg->buf;
- if (xh.xh_data_size > RMSTR_R2NET_MAX_LEN)
- BUG();
- pdata = ramster_async_get_buf;
- *(struct tmem_xhandle *)pdata = xh;
- pdata += sizeof(struct tmem_xhandle);
- local_irq_save(flags);
- found = zcache_get(xh.client_id, xh.pool_id, &xh.oid, xh.index,
- pdata, &size, 1, get_and_free ? 1 : -1);
- local_irq_restore(flags);
- if (found < 0) {
- /* a zero size indicates the get failed */
- size = 0;
- }
- if (size > RMSTR_R2NET_MAX_LEN)
- BUG();
- *ret_data = pdata - sizeof(struct tmem_xhandle);
- /* now make caller (r2net_process_message) handle specially */
- r2net_force_data_magic(msg, RMSTR_TMEM_ASYNC_GET_REPLY, RMSTR_KEY);
- return size + sizeof(struct tmem_xhandle);
-}
-
-static int ramster_remote_async_get_reply_handler(struct r2net_msg *msg,
- u32 len, void *data, void **ret_data)
-{
- char *in = (char *)msg->buf;
- int datalen = len - sizeof(struct r2net_msg);
- int ret = -1;
- struct tmem_xhandle *xh = (struct tmem_xhandle *)in;
-
- in += sizeof(struct tmem_xhandle);
- datalen -= sizeof(struct tmem_xhandle);
- BUG_ON(datalen < 0 || datalen > PAGE_SIZE);
- ret = zcache_localify(xh->pool_id, &xh->oid, xh->index,
- in, datalen, xh->extra);
-#ifdef RAMSTER_TESTING
- if (ret == -EEXIST)
- pr_err("TESTING ArrgREP, aborted overwrite on racy put\n");
-#endif
- return ret;
-}
-
-int ramster_remote_put_handler(struct r2net_msg *msg,
- u32 len, void *data, void **ret_data)
-{
- struct tmem_xhandle *xh;
- char *p = (char *)msg->buf;
- int datalen = len - sizeof(struct r2net_msg) -
- sizeof(struct tmem_xhandle);
- u16 msgtype = be16_to_cpu(msg->msg_type);
- bool ephemeral = (msgtype == RMSTR_TMEM_PUT_EPH);
- unsigned long flags;
- int ret;
-
- xh = (struct tmem_xhandle *)p;
- p += sizeof(struct tmem_xhandle);
- zcache_autocreate_pool(xh->client_id, xh->pool_id, ephemeral);
- local_irq_save(flags);
- ret = zcache_put(xh->client_id, xh->pool_id, &xh->oid, xh->index,
- p, datalen, 1, ephemeral ? 1 : -1);
- local_irq_restore(flags);
- return ret;
-}
-
-int ramster_remote_flush_handler(struct r2net_msg *msg,
- u32 len, void *data, void **ret_data)
-{
- struct tmem_xhandle *xh;
- char *p = (char *)msg->buf;
-
- xh = (struct tmem_xhandle *)p;
- p += sizeof(struct tmem_xhandle);
- (void)zcache_flush(xh->client_id, xh->pool_id, &xh->oid, xh->index);
- return 0;
-}
-
-int ramster_remote_flobj_handler(struct r2net_msg *msg,
- u32 len, void *data, void **ret_data)
-{
- struct tmem_xhandle *xh;
- char *p = (char *)msg->buf;
-
- xh = (struct tmem_xhandle *)p;
- p += sizeof(struct tmem_xhandle);
- (void)zcache_flush_object(xh->client_id, xh->pool_id, &xh->oid);
- return 0;
-}
-
-int ramster_remote_async_get(struct tmem_xhandle *xh, bool free, int remotenode,
- size_t expect_size, uint8_t expect_cksum,
- void *extra)
-{
- int ret = -1, status;
- struct r2nm_node *node = NULL;
- struct kvec vec[1];
- size_t veclen = 1;
- u32 msg_type;
-
- node = r2nm_get_node_by_num(remotenode);
- if (node == NULL)
- goto out;
- xh->client_id = r2nm_this_node(); /* which node is getting */
- xh->xh_data_cksum = expect_cksum;
- xh->xh_data_size = expect_size;
- xh->extra = extra;
- vec[0].iov_len = sizeof(*xh);
- vec[0].iov_base = xh;
- if (free)
- msg_type = RMSTR_TMEM_ASYNC_GET_AND_FREE_REQUEST;
- else
- msg_type = RMSTR_TMEM_ASYNC_GET_REQUEST;
- ret = r2net_send_message_vec(msg_type, RMSTR_KEY,
- vec, veclen, remotenode, &status);
- r2nm_node_put(node);
- if (ret < 0) {
- /* FIXME handle bad message possibilities here? */
- pr_err("UNTESTED ret<0 in ramster_remote_async_get\n");
- }
- ret = status;
-out:
- return ret;
-}
-
-#ifdef RAMSTER_TESTING
-/* leave me here to see if it catches a weird crash */
-static void ramster_check_irq_counts(void)
-{
- static int last_hardirq_cnt, last_softirq_cnt, last_preempt_cnt;
- int cur_hardirq_cnt, cur_softirq_cnt, cur_preempt_cnt;
-
- cur_hardirq_cnt = hardirq_count() >> HARDIRQ_SHIFT;
- if (cur_hardirq_cnt > last_hardirq_cnt) {
- last_hardirq_cnt = cur_hardirq_cnt;
- if (!(last_hardirq_cnt&(last_hardirq_cnt-1)))
- pr_err("RAMSTER TESTING RRP hardirq_count=%d\n",
- last_hardirq_cnt);
- }
- cur_softirq_cnt = softirq_count() >> SOFTIRQ_SHIFT;
- if (cur_softirq_cnt > last_softirq_cnt) {
- last_softirq_cnt = cur_softirq_cnt;
- if (!(last_softirq_cnt&(last_softirq_cnt-1)))
- pr_err("RAMSTER TESTING RRP softirq_count=%d\n",
- last_softirq_cnt);
- }
- cur_preempt_cnt = preempt_count() & PREEMPT_MASK;
- if (cur_preempt_cnt > last_preempt_cnt) {
- last_preempt_cnt = cur_preempt_cnt;
- if (!(last_preempt_cnt&(last_preempt_cnt-1)))
- pr_err("RAMSTER TESTING RRP preempt_count=%d\n",
- last_preempt_cnt);
- }
-}
-#endif
-
-int ramster_remote_put(struct tmem_xhandle *xh, char *data, size_t size,
- bool ephemeral, int *remotenode)
-{
- int nodenum, ret = -1, status;
- struct r2nm_node *node = NULL;
- struct kvec vec[2];
- size_t veclen = 2;
- u32 msg_type;
-#ifdef RAMSTER_TESTING
- struct r2net_node *nn;
-#endif
-
- BUG_ON(size > RMSTR_R2NET_MAX_LEN);
- xh->client_id = r2nm_this_node(); /* which node is putting */
- vec[0].iov_len = sizeof(*xh);
- vec[0].iov_base = xh;
- vec[1].iov_len = size;
- vec[1].iov_base = data;
- node = r2net_target_node;
- if (!node)
- goto out;
-
- nodenum = r2net_target_nodenum;
-
- r2nm_node_get(node);
-
-#ifdef RAMSTER_TESTING
- nn = r2net_nn_from_num(nodenum);
- WARN_ON_ONCE(nn->nn_persistent_error || !nn->nn_sc_valid);
-#endif
-
- if (ephemeral)
- msg_type = RMSTR_TMEM_PUT_EPH;
- else
- msg_type = RMSTR_TMEM_PUT_PERS;
-#ifdef RAMSTER_TESTING
- /* leave me here to see if it catches a weird crash */
- ramster_check_irq_counts();
-#endif
-
- ret = r2net_send_message_vec(msg_type, RMSTR_KEY, vec, veclen,
- nodenum, &status);
-#ifdef RAMSTER_TESTING
- if (ret != 0) {
- static unsigned long cnt;
- cnt++;
- if (!(cnt&(cnt-1)))
- pr_err("ramster_remote_put: message failed, "
- "ret=%d, cnt=%lu\n", ret, cnt);
- ret = -1;
- }
-#endif
- if (ret < 0)
- ret = -1;
- else {
- ret = status;
- *remotenode = nodenum;
- }
-
- r2nm_node_put(node);
-out:
- return ret;
-}
-
-int ramster_remote_flush(struct tmem_xhandle *xh, int remotenode)
-{
- int ret = -1, status;
- struct r2nm_node *node = NULL;
- struct kvec vec[1];
- size_t veclen = 1;
-
- node = r2nm_get_node_by_num(remotenode);
- BUG_ON(node == NULL);
- xh->client_id = r2nm_this_node(); /* which node is flushing */
- vec[0].iov_len = sizeof(*xh);
- vec[0].iov_base = xh;
- BUG_ON(irqs_disabled());
- BUG_ON(in_softirq());
- ret = r2net_send_message_vec(RMSTR_TMEM_FLUSH, RMSTR_KEY,
- vec, veclen, remotenode, &status);
- r2nm_node_put(node);
- return ret;
-}
-
-int ramster_remote_flush_object(struct tmem_xhandle *xh, int remotenode)
-{
- int ret = -1, status;
- struct r2nm_node *node = NULL;
- struct kvec vec[1];
- size_t veclen = 1;
-
- node = r2nm_get_node_by_num(remotenode);
- BUG_ON(node == NULL);
- xh->client_id = r2nm_this_node(); /* which node is flobjing */
- vec[0].iov_len = sizeof(*xh);
- vec[0].iov_base = xh;
- ret = r2net_send_message_vec(RMSTR_TMEM_FLOBJ, RMSTR_KEY,
- vec, veclen, remotenode, &status);
- r2nm_node_put(node);
- return ret;
-}
-
-/*
- * Handler registration
- */
-
-static LIST_HEAD(r2net_unreg_list);
-
-static void r2net_unregister_handlers(void)
-{
- r2net_unregister_handler_list(&r2net_unreg_list);
-}
-
-int r2net_register_handlers(void)
-{
- int status;
-
- status = r2net_register_handler(RMSTR_TMEM_PUT_EPH, RMSTR_KEY,
- RMSTR_R2NET_MAX_LEN,
- ramster_remote_put_handler,
- NULL, NULL, &r2net_unreg_list);
- if (status)
- goto bail;
-
- status = r2net_register_handler(RMSTR_TMEM_PUT_PERS, RMSTR_KEY,
- RMSTR_R2NET_MAX_LEN,
- ramster_remote_put_handler,
- NULL, NULL, &r2net_unreg_list);
- if (status)
- goto bail;
-
- status = r2net_register_handler(RMSTR_TMEM_ASYNC_GET_REQUEST, RMSTR_KEY,
- RMSTR_R2NET_MAX_LEN,
- ramster_remote_async_get_request_handler,
- NULL, NULL,
- &r2net_unreg_list);
- if (status)
- goto bail;
-
- status = r2net_register_handler(RMSTR_TMEM_ASYNC_GET_AND_FREE_REQUEST,
- RMSTR_KEY, RMSTR_R2NET_MAX_LEN,
- ramster_remote_async_get_request_handler,
- NULL, NULL,
- &r2net_unreg_list);
- if (status)
- goto bail;
-
- status = r2net_register_handler(RMSTR_TMEM_ASYNC_GET_REPLY, RMSTR_KEY,
- RMSTR_R2NET_MAX_LEN,
- ramster_remote_async_get_reply_handler,
- NULL, NULL,
- &r2net_unreg_list);
- if (status)
- goto bail;
-
- status = r2net_register_handler(RMSTR_TMEM_FLUSH, RMSTR_KEY,
- RMSTR_R2NET_MAX_LEN,
- ramster_remote_flush_handler,
- NULL, NULL,
- &r2net_unreg_list);
- if (status)
- goto bail;
-
- status = r2net_register_handler(RMSTR_TMEM_FLOBJ, RMSTR_KEY,
- RMSTR_R2NET_MAX_LEN,
- ramster_remote_flobj_handler,
- NULL, NULL,
- &r2net_unreg_list);
- if (status)
- goto bail;
-
- pr_info("ramster: r2net handlers registered\n");
-
-bail:
- if (status) {
- r2net_unregister_handlers();
- pr_err("ramster: couldn't register r2net handlers\n");
- }
- return status;
-}
diff --git a/drivers/staging/ramster/ramster.h b/drivers/staging/ramster/ramster.h
deleted file mode 100644
index 0c9455e..0000000
--- a/drivers/staging/ramster/ramster.h
+++ /dev/null
@@ -1,118 +0,0 @@
-/*
- * ramster.h
- *
- * Peer-to-peer transcendent memory
- *
- * Copyright (c) 2009-2012, Dan Magenheimer, Oracle Corp.
- */
-
-#ifndef _RAMSTER_H_
-#define _RAMSTER_H_
-
-/*
- * format of remote pampd:
- * bit 0 == intransit
- * bit 1 == is_remote... if this bit is set, then
- * bit 2-9 == remotenode
- * bit 10-22 == size
- * bit 23-30 == cksum
- */
-#define FAKE_PAMPD_INTRANSIT_BITS 1
-#define FAKE_PAMPD_ISREMOTE_BITS 1
-#define FAKE_PAMPD_REMOTENODE_BITS 8
-#define FAKE_PAMPD_REMOTESIZE_BITS 13
-#define FAKE_PAMPD_CHECKSUM_BITS 8
-
-#define FAKE_PAMPD_INTRANSIT_SHIFT 0
-#define FAKE_PAMPD_ISREMOTE_SHIFT (FAKE_PAMPD_INTRANSIT_SHIFT + \
- FAKE_PAMPD_INTRANSIT_BITS)
-#define FAKE_PAMPD_REMOTENODE_SHIFT (FAKE_PAMPD_ISREMOTE_SHIFT + \
- FAKE_PAMPD_ISREMOTE_BITS)
-#define FAKE_PAMPD_REMOTESIZE_SHIFT (FAKE_PAMPD_REMOTENODE_SHIFT + \
- FAKE_PAMPD_REMOTENODE_BITS)
-#define FAKE_PAMPD_CHECKSUM_SHIFT (FAKE_PAMPD_REMOTESIZE_SHIFT + \
- FAKE_PAMPD_REMOTESIZE_BITS)
-
-#define FAKE_PAMPD_MASK(x) ((1UL << (x)) - 1)
-
-static inline void *pampd_make_remote(int remotenode, size_t size,
- unsigned char cksum)
-{
- unsigned long fake_pampd = 0;
- fake_pampd |= 1UL << FAKE_PAMPD_ISREMOTE_SHIFT;
- fake_pampd |= ((unsigned long)remotenode &
- FAKE_PAMPD_MASK(FAKE_PAMPD_REMOTENODE_BITS)) <<
- FAKE_PAMPD_REMOTENODE_SHIFT;
- fake_pampd |= ((unsigned long)size &
- FAKE_PAMPD_MASK(FAKE_PAMPD_REMOTESIZE_BITS)) <<
- FAKE_PAMPD_REMOTESIZE_SHIFT;
- fake_pampd |= ((unsigned long)cksum &
- FAKE_PAMPD_MASK(FAKE_PAMPD_CHECKSUM_BITS)) <<
- FAKE_PAMPD_CHECKSUM_SHIFT;
- return (void *)fake_pampd;
-}
-
-static inline unsigned int pampd_remote_node(void *pampd)
-{
- unsigned long fake_pampd = (unsigned long)pampd;
- return (fake_pampd >> FAKE_PAMPD_REMOTENODE_SHIFT) &
- FAKE_PAMPD_MASK(FAKE_PAMPD_REMOTENODE_BITS);
-}
-
-static inline unsigned int pampd_remote_size(void *pampd)
-{
- unsigned long fake_pampd = (unsigned long)pampd;
- return (fake_pampd >> FAKE_PAMPD_REMOTESIZE_SHIFT) &
- FAKE_PAMPD_MASK(FAKE_PAMPD_REMOTESIZE_BITS);
-}
-
-static inline unsigned char pampd_remote_cksum(void *pampd)
-{
- unsigned long fake_pampd = (unsigned long)pampd;
- return (fake_pampd >> FAKE_PAMPD_CHECKSUM_SHIFT) &
- FAKE_PAMPD_MASK(FAKE_PAMPD_CHECKSUM_BITS);
-}
-
-static inline bool pampd_is_remote(void *pampd)
-{
- unsigned long fake_pampd = (unsigned long)pampd;
- return (fake_pampd >> FAKE_PAMPD_ISREMOTE_SHIFT) &
- FAKE_PAMPD_MASK(FAKE_PAMPD_ISREMOTE_BITS);
-}
-
-static inline bool pampd_is_intransit(void *pampd)
-{
- unsigned long fake_pampd = (unsigned long)pampd;
- return (fake_pampd >> FAKE_PAMPD_INTRANSIT_SHIFT) &
- FAKE_PAMPD_MASK(FAKE_PAMPD_INTRANSIT_BITS);
-}
-
-/* note that it is a BUG for intransit to be set without isremote also set */
-static inline void *pampd_mark_intransit(void *pampd)
-{
- unsigned long fake_pampd = (unsigned long)pampd;
-
- fake_pampd |= 1UL << FAKE_PAMPD_ISREMOTE_SHIFT;
- fake_pampd |= 1UL << FAKE_PAMPD_INTRANSIT_SHIFT;
- return (void *)fake_pampd;
-}
-
-static inline void *pampd_mask_intransit_and_remote(void *marked_pampd)
-{
- unsigned long pampd = (unsigned long)marked_pampd;
-
- pampd &= ~(1UL << FAKE_PAMPD_INTRANSIT_SHIFT);
- pampd &= ~(1UL << FAKE_PAMPD_ISREMOTE_SHIFT);
- return (void *)pampd;
-}
-
-extern int ramster_remote_async_get(struct tmem_xhandle *,
- bool, int, size_t, uint8_t, void *extra);
-extern int ramster_remote_put(struct tmem_xhandle *, char *, size_t,
- bool, int *);
-extern int ramster_remote_flush(struct tmem_xhandle *, int);
-extern int ramster_remote_flush_object(struct tmem_xhandle *, int);
-extern int r2net_register_handlers(void);
-extern int r2net_remote_target_node_set(int);
-
-#endif /* _TMEM_H */
diff --git a/drivers/staging/ramster/tmem.c b/drivers/staging/ramster/tmem.c
deleted file mode 100644
index 8f2f689..0000000
--- a/drivers/staging/ramster/tmem.c
+++ /dev/null
@@ -1,851 +0,0 @@
-/*
- * In-kernel transcendent memory (generic implementation)
- *
- * Copyright (c) 2009-2011, Dan Magenheimer, Oracle Corp.
- *
- * The primary purpose of Transcedent Memory ("tmem") is to map object-oriented
- * "handles" (triples containing a pool id, and object id, and an index), to
- * pages in a page-accessible memory (PAM). Tmem references the PAM pages via
- * an abstract "pampd" (PAM page-descriptor), which can be operated on by a
- * set of functions (pamops). Each pampd contains some representation of
- * PAGE_SIZE bytes worth of data. Tmem must support potentially millions of
- * pages and must be able to insert, find, and delete these pages at a
- * potential frequency of thousands per second concurrently across many CPUs,
- * (and, if used with KVM, across many vcpus across many guests).
- * Tmem is tracked with a hierarchy of data structures, organized by
- * the elements in a handle-tuple: pool_id, object_id, and page index.
- * One or more "clients" (e.g. guests) each provide one or more tmem_pools.
- * Each pool, contains a hash table of rb_trees of tmem_objs. Each
- * tmem_obj contains a radix-tree-like tree of pointers, with intermediate
- * nodes called tmem_objnodes. Each leaf pointer in this tree points to
- * a pampd, which is accessible only through a small set of callbacks
- * registered by the PAM implementation (see tmem_register_pamops). Tmem
- * does all memory allocation via a set of callbacks registered by the tmem
- * host implementation (e.g. see tmem_register_hostops).
- */
-
-#include <linux/list.h>
-#include <linux/spinlock.h>
-#include <linux/atomic.h>
-#include <linux/delay.h>
-
-#include "tmem.h"
-
-/* data structure sentinels used for debugging... see tmem.h */
-#define POOL_SENTINEL 0x87658765
-#define OBJ_SENTINEL 0x12345678
-#define OBJNODE_SENTINEL 0xfedcba09
-
-/*
- * A tmem host implementation must use this function to register callbacks
- * for memory allocation.
- */
-static struct tmem_hostops tmem_hostops;
-
-static void tmem_objnode_tree_init(void);
-
-void tmem_register_hostops(struct tmem_hostops *m)
-{
- tmem_objnode_tree_init();
- tmem_hostops = *m;
-}
-
-/*
- * A tmem host implementation must use this function to register
- * callbacks for a page-accessible memory (PAM) implementation
- */
-static struct tmem_pamops tmem_pamops;
-
-void tmem_register_pamops(struct tmem_pamops *m)
-{
- tmem_pamops = *m;
-}
-
-/*
- * Oid's are potentially very sparse and tmem_objs may have an indeterminately
- * short life, being added and deleted at a relatively high frequency.
- * So an rb_tree is an ideal data structure to manage tmem_objs. But because
- * of the potentially huge number of tmem_objs, each pool manages a hashtable
- * of rb_trees to reduce search, insert, delete, and rebalancing time.
- * Each hashbucket also has a lock to manage concurrent access.
- *
- * The following routines manage tmem_objs. When any tmem_obj is accessed,
- * the hashbucket lock must be held.
- */
-
-/* searches for object==oid in pool, returns locked object if found */
-static struct tmem_obj *tmem_obj_find(struct tmem_hashbucket *hb,
- struct tmem_oid *oidp)
-{
- struct rb_node *rbnode;
- struct tmem_obj *obj;
-
- rbnode = hb->obj_rb_root.rb_node;
- while (rbnode) {
- BUG_ON(RB_EMPTY_NODE(rbnode));
- obj = rb_entry(rbnode, struct tmem_obj, rb_tree_node);
- switch (tmem_oid_compare(oidp, &obj->oid)) {
- case 0: /* equal */
- goto out;
- case -1:
- rbnode = rbnode->rb_left;
- break;
- case 1:
- rbnode = rbnode->rb_right;
- break;
- }
- }
- obj = NULL;
-out:
- return obj;
-}
-
-static void tmem_pampd_destroy_all_in_obj(struct tmem_obj *);
-
-/* free an object that has no more pampds in it */
-static void tmem_obj_free(struct tmem_obj *obj, struct tmem_hashbucket *hb)
-{
- struct tmem_pool *pool;
-
- BUG_ON(obj == NULL);
- ASSERT_SENTINEL(obj, OBJ);
- BUG_ON(obj->pampd_count > 0);
- pool = obj->pool;
- BUG_ON(pool == NULL);
- if (obj->objnode_tree_root != NULL) /* may be "stump" with no leaves */
- tmem_pampd_destroy_all_in_obj(obj);
- BUG_ON(obj->objnode_tree_root != NULL);
- BUG_ON((long)obj->objnode_count != 0);
- atomic_dec(&pool->obj_count);
- BUG_ON(atomic_read(&pool->obj_count) < 0);
- INVERT_SENTINEL(obj, OBJ);
- obj->pool = NULL;
- tmem_oid_set_invalid(&obj->oid);
- rb_erase(&obj->rb_tree_node, &hb->obj_rb_root);
-}
-
-/*
- * initialize, and insert an tmem_object_root (called only if find failed)
- */
-static void tmem_obj_init(struct tmem_obj *obj, struct tmem_hashbucket *hb,
- struct tmem_pool *pool,
- struct tmem_oid *oidp)
-{
- struct rb_root *root = &hb->obj_rb_root;
- struct rb_node **new = &(root->rb_node), *parent = NULL;
- struct tmem_obj *this;
-
- BUG_ON(pool == NULL);
- atomic_inc(&pool->obj_count);
- obj->objnode_tree_height = 0;
- obj->objnode_tree_root = NULL;
- obj->pool = pool;
- obj->oid = *oidp;
- obj->objnode_count = 0;
- obj->pampd_count = 0;
- (*tmem_pamops.new_obj)(obj);
- SET_SENTINEL(obj, OBJ);
- while (*new) {
- BUG_ON(RB_EMPTY_NODE(*new));
- this = rb_entry(*new, struct tmem_obj, rb_tree_node);
- parent = *new;
- switch (tmem_oid_compare(oidp, &this->oid)) {
- case 0:
- BUG(); /* already present; should never happen! */
- break;
- case -1:
- new = &(*new)->rb_left;
- break;
- case 1:
- new = &(*new)->rb_right;
- break;
- }
- }
- rb_link_node(&obj->rb_tree_node, parent, new);
- rb_insert_color(&obj->rb_tree_node, root);
-}
-
-/*
- * Tmem is managed as a set of tmem_pools with certain attributes, such as
- * "ephemeral" vs "persistent". These attributes apply to all tmem_objs
- * and all pampds that belong to a tmem_pool. A tmem_pool is created
- * or deleted relatively rarely (for example, when a filesystem is
- * mounted or unmounted.
- */
-
-/* flush all data from a pool and, optionally, free it */
-static void tmem_pool_flush(struct tmem_pool *pool, bool destroy)
-{
- struct rb_node *rbnode;
- struct tmem_obj *obj;
- struct tmem_hashbucket *hb = &pool->hashbucket[0];
- int i;
-
- BUG_ON(pool == NULL);
- for (i = 0; i < TMEM_HASH_BUCKETS; i++, hb++) {
- spin_lock(&hb->lock);
- rbnode = rb_first(&hb->obj_rb_root);
- while (rbnode != NULL) {
- obj = rb_entry(rbnode, struct tmem_obj, rb_tree_node);
- rbnode = rb_next(rbnode);
- tmem_pampd_destroy_all_in_obj(obj);
- tmem_obj_free(obj, hb);
- (*tmem_hostops.obj_free)(obj, pool);
- }
- spin_unlock(&hb->lock);
- }
- if (destroy)
- list_del(&pool->pool_list);
-}
-
-/*
- * A tmem_obj contains a radix-tree-like tree in which the intermediate
- * nodes are called tmem_objnodes. (The kernel lib/radix-tree.c implementation
- * is very specialized and tuned for specific uses and is not particularly
- * suited for use from this code, though some code from the core algorithms has
- * been reused, thus the copyright notices below). Each tmem_objnode contains
- * a set of pointers which point to either a set of intermediate tmem_objnodes
- * or a set of of pampds.
- *
- * Portions Copyright (C) 2001 Momchil Velikov
- * Portions Copyright (C) 2001 Christoph Hellwig
- * Portions Copyright (C) 2005 SGI, Christoph Lameter <clameter@xxxxxxx>
- */
-
-struct tmem_objnode_tree_path {
- struct tmem_objnode *objnode;
- int offset;
-};
-
-/* objnode height_to_maxindex translation */
-static unsigned long tmem_objnode_tree_h2max[OBJNODE_TREE_MAX_PATH + 1];
-
-static void tmem_objnode_tree_init(void)
-{
- unsigned int ht, tmp;
-
- for (ht = 0; ht < ARRAY_SIZE(tmem_objnode_tree_h2max); ht++) {
- tmp = ht * OBJNODE_TREE_MAP_SHIFT;
- if (tmp >= OBJNODE_TREE_INDEX_BITS)
- tmem_objnode_tree_h2max[ht] = ~0UL;
- else
- tmem_objnode_tree_h2max[ht] =
- (~0UL >> (OBJNODE_TREE_INDEX_BITS - tmp - 1)) >> 1;
- }
-}
-
-static struct tmem_objnode *tmem_objnode_alloc(struct tmem_obj *obj)
-{
- struct tmem_objnode *objnode;
-
- ASSERT_SENTINEL(obj, OBJ);
- BUG_ON(obj->pool == NULL);
- ASSERT_SENTINEL(obj->pool, POOL);
- objnode = (*tmem_hostops.objnode_alloc)(obj->pool);
- if (unlikely(objnode == NULL))
- goto out;
- objnode->obj = obj;
- SET_SENTINEL(objnode, OBJNODE);
- memset(&objnode->slots, 0, sizeof(objnode->slots));
- objnode->slots_in_use = 0;
- obj->objnode_count++;
-out:
- return objnode;
-}
-
-static void tmem_objnode_free(struct tmem_objnode *objnode)
-{
- struct tmem_pool *pool;
- int i;
-
- BUG_ON(objnode == NULL);
- for (i = 0; i < OBJNODE_TREE_MAP_SIZE; i++)
- BUG_ON(objnode->slots[i] != NULL);
- ASSERT_SENTINEL(objnode, OBJNODE);
- INVERT_SENTINEL(objnode, OBJNODE);
- BUG_ON(objnode->obj == NULL);
- ASSERT_SENTINEL(objnode->obj, OBJ);
- pool = objnode->obj->pool;
- BUG_ON(pool == NULL);
- ASSERT_SENTINEL(pool, POOL);
- objnode->obj->objnode_count--;
- objnode->obj = NULL;
- (*tmem_hostops.objnode_free)(objnode, pool);
-}
-
-/*
- * lookup index in object and return associated pampd (or NULL if not found)
- */
-static void **__tmem_pampd_lookup_in_obj(struct tmem_obj *obj, uint32_t index)
-{
- unsigned int height, shift;
- struct tmem_objnode **slot = NULL;
-
- BUG_ON(obj == NULL);
- ASSERT_SENTINEL(obj, OBJ);
- BUG_ON(obj->pool == NULL);
- ASSERT_SENTINEL(obj->pool, POOL);
-
- height = obj->objnode_tree_height;
- if (index > tmem_objnode_tree_h2max[obj->objnode_tree_height])
- goto out;
- if (height == 0 && obj->objnode_tree_root) {
- slot = &obj->objnode_tree_root;
- goto out;
- }
- shift = (height-1) * OBJNODE_TREE_MAP_SHIFT;
- slot = &obj->objnode_tree_root;
- while (height > 0) {
- if (*slot == NULL)
- goto out;
- slot = (struct tmem_objnode **)
- ((*slot)->slots +
- ((index >> shift) & OBJNODE_TREE_MAP_MASK));
- shift -= OBJNODE_TREE_MAP_SHIFT;
- height--;
- }
-out:
- return slot != NULL ? (void **)slot : NULL;
-}
-
-static void *tmem_pampd_lookup_in_obj(struct tmem_obj *obj, uint32_t index)
-{
- struct tmem_objnode **slot;
-
- slot = (struct tmem_objnode **)__tmem_pampd_lookup_in_obj(obj, index);
- return slot != NULL ? *slot : NULL;
-}
-
-static void *tmem_pampd_replace_in_obj(struct tmem_obj *obj, uint32_t index,
- void *new_pampd, bool no_free)
-{
- struct tmem_objnode **slot;
- void *ret = NULL;
-
- slot = (struct tmem_objnode **)__tmem_pampd_lookup_in_obj(obj, index);
- if ((slot != NULL) && (*slot != NULL)) {
- void *old_pampd = *(void **)slot;
- *(void **)slot = new_pampd;
- if (!no_free)
- (*tmem_pamops.free)(old_pampd, obj->pool,
- NULL, 0, false);
- ret = new_pampd;
- }
- return ret;
-}
-
-static int tmem_pampd_add_to_obj(struct tmem_obj *obj, uint32_t index,
- void *pampd)
-{
- int ret = 0;
- struct tmem_objnode *objnode = NULL, *newnode, *slot;
- unsigned int height, shift;
- int offset = 0;
-
- /* if necessary, extend the tree to be higher */
- if (index > tmem_objnode_tree_h2max[obj->objnode_tree_height]) {
- height = obj->objnode_tree_height + 1;
- if (index > tmem_objnode_tree_h2max[height])
- while (index > tmem_objnode_tree_h2max[height])
- height++;
- if (obj->objnode_tree_root == NULL) {
- obj->objnode_tree_height = height;
- goto insert;
- }
- do {
- newnode = tmem_objnode_alloc(obj);
- if (!newnode) {
- ret = -ENOMEM;
- goto out;
- }
- newnode->slots[0] = obj->objnode_tree_root;
- newnode->slots_in_use = 1;
- obj->objnode_tree_root = newnode;
- obj->objnode_tree_height++;
- } while (height > obj->objnode_tree_height);
- }
-insert:
- slot = obj->objnode_tree_root;
- height = obj->objnode_tree_height;
- shift = (height-1) * OBJNODE_TREE_MAP_SHIFT;
- while (height > 0) {
- if (slot == NULL) {
- /* add a child objnode. */
- slot = tmem_objnode_alloc(obj);
- if (!slot) {
- ret = -ENOMEM;
- goto out;
- }
- if (objnode) {
-
- objnode->slots[offset] = slot;
- objnode->slots_in_use++;
- } else
- obj->objnode_tree_root = slot;
- }
- /* go down a level */
- offset = (index >> shift) & OBJNODE_TREE_MAP_MASK;
- objnode = slot;
- slot = objnode->slots[offset];
- shift -= OBJNODE_TREE_MAP_SHIFT;
- height--;
- }
- BUG_ON(slot != NULL);
- if (objnode) {
- objnode->slots_in_use++;
- objnode->slots[offset] = pampd;
- } else
- obj->objnode_tree_root = pampd;
- obj->pampd_count++;
-out:
- return ret;
-}
-
-static void *tmem_pampd_delete_from_obj(struct tmem_obj *obj, uint32_t index)
-{
- struct tmem_objnode_tree_path path[OBJNODE_TREE_MAX_PATH + 1];
- struct tmem_objnode_tree_path *pathp = path;
- struct tmem_objnode *slot = NULL;
- unsigned int height, shift;
- int offset;
-
- BUG_ON(obj == NULL);
- ASSERT_SENTINEL(obj, OBJ);
- BUG_ON(obj->pool == NULL);
- ASSERT_SENTINEL(obj->pool, POOL);
- height = obj->objnode_tree_height;
- if (index > tmem_objnode_tree_h2max[height])
- goto out;
- slot = obj->objnode_tree_root;
- if (height == 0 && obj->objnode_tree_root) {
- obj->objnode_tree_root = NULL;
- goto out;
- }
- shift = (height - 1) * OBJNODE_TREE_MAP_SHIFT;
- pathp->objnode = NULL;
- do {
- if (slot == NULL)
- goto out;
- pathp++;
- offset = (index >> shift) & OBJNODE_TREE_MAP_MASK;
- pathp->offset = offset;
- pathp->objnode = slot;
- slot = slot->slots[offset];
- shift -= OBJNODE_TREE_MAP_SHIFT;
- height--;
- } while (height > 0);
- if (slot == NULL)
- goto out;
- while (pathp->objnode) {
- pathp->objnode->slots[pathp->offset] = NULL;
- pathp->objnode->slots_in_use--;
- if (pathp->objnode->slots_in_use) {
- if (pathp->objnode == obj->objnode_tree_root) {
- while (obj->objnode_tree_height > 0 &&
- obj->objnode_tree_root->slots_in_use == 1 &&
- obj->objnode_tree_root->slots[0]) {
- struct tmem_objnode *to_free =
- obj->objnode_tree_root;
-
- obj->objnode_tree_root =
- to_free->slots[0];
- obj->objnode_tree_height--;
- to_free->slots[0] = NULL;
- to_free->slots_in_use = 0;
- tmem_objnode_free(to_free);
- }
- }
- goto out;
- }
- tmem_objnode_free(pathp->objnode); /* 0 slots used, free it */
- pathp--;
- }
- obj->objnode_tree_height = 0;
- obj->objnode_tree_root = NULL;
-
-out:
- if (slot != NULL)
- obj->pampd_count--;
- BUG_ON(obj->pampd_count < 0);
- return slot;
-}
-
-/* recursively walk the objnode_tree destroying pampds and objnodes */
-static void tmem_objnode_node_destroy(struct tmem_obj *obj,
- struct tmem_objnode *objnode,
- unsigned int ht)
-{
- int i;
-
- if (ht == 0)
- return;
- for (i = 0; i < OBJNODE_TREE_MAP_SIZE; i++) {
- if (objnode->slots[i]) {
- if (ht == 1) {
- obj->pampd_count--;
- (*tmem_pamops.free)(objnode->slots[i],
- obj->pool, NULL, 0, true);
- objnode->slots[i] = NULL;
- continue;
- }
- tmem_objnode_node_destroy(obj, objnode->slots[i], ht-1);
- tmem_objnode_free(objnode->slots[i]);
- objnode->slots[i] = NULL;
- }
- }
-}
-
-static void tmem_pampd_destroy_all_in_obj(struct tmem_obj *obj)
-{
- if (obj->objnode_tree_root == NULL)
- return;
- if (obj->objnode_tree_height == 0) {
- obj->pampd_count--;
- (*tmem_pamops.free)(obj->objnode_tree_root,
- obj->pool, NULL, 0, true);
- } else {
- tmem_objnode_node_destroy(obj, obj->objnode_tree_root,
- obj->objnode_tree_height);
- tmem_objnode_free(obj->objnode_tree_root);
- obj->objnode_tree_height = 0;
- }
- obj->objnode_tree_root = NULL;
- (*tmem_pamops.free_obj)(obj->pool, obj);
-}
-
-/*
- * Tmem is operated on by a set of well-defined actions:
- * "put", "get", "flush", "flush_object", "new pool" and "destroy pool".
- * (The tmem ABI allows for subpages and exchanges but these operations
- * are not included in this implementation.)
- *
- * These "tmem core" operations are implemented in the following functions.
- */
-
-/*
- * "Put" a page, e.g. copy a page from the kernel into newly allocated
- * PAM space (if such space is available). Tmem_put is complicated by
- * a corner case: What if a page with matching handle already exists in
- * tmem? To guarantee coherency, one of two actions is necessary: Either
- * the data for the page must be overwritten, or the page must be
- * "flushed" so that the data is not accessible to a subsequent "get".
- * Since these "duplicate puts" are relatively rare, this implementation
- * always flushes for simplicity.
- */
-int tmem_put(struct tmem_pool *pool, struct tmem_oid *oidp, uint32_t index,
- char *data, size_t size, bool raw, int ephemeral)
-{
- struct tmem_obj *obj = NULL, *objfound = NULL, *objnew = NULL;
- void *pampd = NULL, *pampd_del = NULL;
- int ret = -ENOMEM;
- struct tmem_hashbucket *hb;
-
- hb = &pool->hashbucket[tmem_oid_hash(oidp)];
- spin_lock(&hb->lock);
- obj = objfound = tmem_obj_find(hb, oidp);
- if (obj != NULL) {
- pampd = tmem_pampd_lookup_in_obj(objfound, index);
- if (pampd != NULL) {
- /* if found, is a dup put, flush the old one */
- pampd_del = tmem_pampd_delete_from_obj(obj, index);
- BUG_ON(pampd_del != pampd);
- (*tmem_pamops.free)(pampd, pool, oidp, index, true);
- if (obj->pampd_count == 0) {
- objnew = obj;
- objfound = NULL;
- }
- pampd = NULL;
- }
- } else {
- obj = objnew = (*tmem_hostops.obj_alloc)(pool);
- if (unlikely(obj == NULL)) {
- ret = -ENOMEM;
- goto out;
- }
- tmem_obj_init(obj, hb, pool, oidp);
- }
- BUG_ON(obj == NULL);
- BUG_ON(((objnew != obj) && (objfound != obj)) || (objnew == objfound));
- pampd = (*tmem_pamops.create)(data, size, raw, ephemeral,
- obj->pool, &obj->oid, index);
- if (unlikely(pampd == NULL))
- goto free;
- ret = tmem_pampd_add_to_obj(obj, index, pampd);
- if (unlikely(ret == -ENOMEM))
- /* may have partially built objnode tree ("stump") */
- goto delete_and_free;
- goto out;
-
-delete_and_free:
- (void)tmem_pampd_delete_from_obj(obj, index);
-free:
- if (pampd)
- (*tmem_pamops.free)(pampd, pool, NULL, 0, true);
- if (objnew) {
- tmem_obj_free(objnew, hb);
- (*tmem_hostops.obj_free)(objnew, pool);
- }
-out:
- spin_unlock(&hb->lock);
- return ret;
-}
-
-void *tmem_localify_get_pampd(struct tmem_pool *pool, struct tmem_oid *oidp,
- uint32_t index, struct tmem_obj **ret_obj,
- void **saved_hb)
-{
- struct tmem_hashbucket *hb;
- struct tmem_obj *obj = NULL;
- void *pampd = NULL;
-
- hb = &pool->hashbucket[tmem_oid_hash(oidp)];
- spin_lock(&hb->lock);
- obj = tmem_obj_find(hb, oidp);
- if (likely(obj != NULL))
- pampd = tmem_pampd_lookup_in_obj(obj, index);
- *ret_obj = obj;
- *saved_hb = (void *)hb;
- /* note, hashbucket remains locked */
- return pampd;
-}
-
-void tmem_localify_finish(struct tmem_obj *obj, uint32_t index,
- void *pampd, void *saved_hb, bool delete)
-{
- struct tmem_hashbucket *hb = (struct tmem_hashbucket *)saved_hb;
-
- BUG_ON(!spin_is_locked(&hb->lock));
- if (pampd != NULL) {
- BUG_ON(obj == NULL);
- (void)tmem_pampd_replace_in_obj(obj, index, pampd, 1);
- } else if (delete) {
- BUG_ON(obj == NULL);
- (void)tmem_pampd_delete_from_obj(obj, index);
- }
- spin_unlock(&hb->lock);
-}
-
-static int tmem_repatriate(void **ppampd, struct tmem_hashbucket *hb,
- struct tmem_pool *pool, struct tmem_oid *oidp,
- uint32_t index, bool free, char *data)
-{
- void *old_pampd = *ppampd, *new_pampd = NULL;
- bool intransit = false;
- int ret = 0;
-
-
- if (!is_ephemeral(pool))
- new_pampd = (*tmem_pamops.repatriate_preload)(
- old_pampd, pool, oidp, index, &intransit);
- if (intransit)
- ret = -EAGAIN;
- else if (new_pampd != NULL)
- *ppampd = new_pampd;
- /* must release the hb->lock else repatriate can't sleep */
- spin_unlock(&hb->lock);
- if (!intransit)
- ret = (*tmem_pamops.repatriate)(old_pampd, new_pampd, pool,
- oidp, index, free, data);
- return ret;
-}
-
-/*
- * "Get" a page, e.g. if one can be found, copy the tmem page with the
- * matching handle from PAM space to the kernel. By tmem definition,
- * when a "get" is successful on an ephemeral page, the page is "flushed",
- * and when a "get" is successful on a persistent page, the page is retained
- * in tmem. Note that to preserve
- * coherency, "get" can never be skipped if tmem contains the data.
- * That is, if a get is done with a certain handle and fails, any
- * subsequent "get" must also fail (unless of course there is a
- * "put" done with the same handle).
-
- */
-int tmem_get(struct tmem_pool *pool, struct tmem_oid *oidp, uint32_t index,
- char *data, size_t *size, bool raw, int get_and_free)
-{
- struct tmem_obj *obj;
- void *pampd;
- bool ephemeral = is_ephemeral(pool);
- int ret = -1;
- struct tmem_hashbucket *hb;
- bool free = (get_and_free == 1) || ((get_and_free == 0) && ephemeral);
- bool lock_held = 0;
- void **ppampd;
-
-again:
- hb = &pool->hashbucket[tmem_oid_hash(oidp)];
- spin_lock(&hb->lock);
- lock_held = 1;
- obj = tmem_obj_find(hb, oidp);
- if (obj == NULL)
- goto out;
- ppampd = __tmem_pampd_lookup_in_obj(obj, index);
- if (ppampd == NULL)
- goto out;
- if (tmem_pamops.is_remote(*ppampd)) {
- ret = tmem_repatriate(ppampd, hb, pool, oidp,
- index, free, data);
- lock_held = 0; /* note hb->lock has been unlocked */
- if (ret == -EAGAIN) {
- /* rare I think, but should cond_resched()??? */
- usleep_range(10, 1000);
- goto again;
- } else if (ret != 0) {
- if (ret != -ENOENT)
- pr_err("UNTESTED case in tmem_get, ret=%d\n",
- ret);
- ret = -1;
- goto out;
- }
- goto out;
- }
- if (free)
- pampd = tmem_pampd_delete_from_obj(obj, index);
- else
- pampd = tmem_pampd_lookup_in_obj(obj, index);
- if (pampd == NULL)
- goto out;
- if (free) {
- if (obj->pampd_count == 0) {
- tmem_obj_free(obj, hb);
- (*tmem_hostops.obj_free)(obj, pool);
- obj = NULL;
- }
- }
- if (free)
- ret = (*tmem_pamops.get_data_and_free)(
- data, size, raw, pampd, pool, oidp, index);
- else
- ret = (*tmem_pamops.get_data)(
- data, size, raw, pampd, pool, oidp, index);
- if (ret < 0)
- goto out;
- ret = 0;
-out:
- if (lock_held)
- spin_unlock(&hb->lock);
- return ret;
-}
-
-/*
- * If a page in tmem matches the handle, "flush" this page from tmem such
- * that any subsequent "get" does not succeed (unless, of course, there
- * was another "put" with the same handle).
- */
-int tmem_flush_page(struct tmem_pool *pool,
- struct tmem_oid *oidp, uint32_t index)
-{
- struct tmem_obj *obj;
- void *pampd;
- int ret = -1;
- struct tmem_hashbucket *hb;
-
- hb = &pool->hashbucket[tmem_oid_hash(oidp)];
- spin_lock(&hb->lock);
- obj = tmem_obj_find(hb, oidp);
- if (obj == NULL)
- goto out;
- pampd = tmem_pampd_delete_from_obj(obj, index);
- if (pampd == NULL)
- goto out;
- (*tmem_pamops.free)(pampd, pool, oidp, index, true);
- if (obj->pampd_count == 0) {
- tmem_obj_free(obj, hb);
- (*tmem_hostops.obj_free)(obj, pool);
- }
- ret = 0;
-
-out:
- spin_unlock(&hb->lock);
- return ret;
-}
-
-/*
- * If a page in tmem matches the handle, replace the page so that any
- * subsequent "get" gets the new page. Returns the new page if
- * there was a page to replace, else returns NULL.
- */
-int tmem_replace(struct tmem_pool *pool, struct tmem_oid *oidp,
- uint32_t index, void *new_pampd)
-{
- struct tmem_obj *obj;
- int ret = -1;
- struct tmem_hashbucket *hb;
-
- hb = &pool->hashbucket[tmem_oid_hash(oidp)];
- spin_lock(&hb->lock);
- obj = tmem_obj_find(hb, oidp);
- if (obj == NULL)
- goto out;
- new_pampd = tmem_pampd_replace_in_obj(obj, index, new_pampd, 0);
- ret = (*tmem_pamops.replace_in_obj)(new_pampd, obj);
-out:
- spin_unlock(&hb->lock);
- return ret;
-}
-
-/*
- * "Flush" all pages in tmem matching this oid.
- */
-int tmem_flush_object(struct tmem_pool *pool, struct tmem_oid *oidp)
-{
- struct tmem_obj *obj;
- struct tmem_hashbucket *hb;
- int ret = -1;
-
- hb = &pool->hashbucket[tmem_oid_hash(oidp)];
- spin_lock(&hb->lock);
- obj = tmem_obj_find(hb, oidp);
- if (obj == NULL)
- goto out;
- tmem_pampd_destroy_all_in_obj(obj);
- tmem_obj_free(obj, hb);
- (*tmem_hostops.obj_free)(obj, pool);
- ret = 0;
-
-out:
- spin_unlock(&hb->lock);
- return ret;
-}
-
-/*
- * "Flush" all pages (and tmem_objs) from this tmem_pool and disable
- * all subsequent access to this tmem_pool.
- */
-int tmem_destroy_pool(struct tmem_pool *pool)
-{
- int ret = -1;
-
- if (pool == NULL)
- goto out;
- tmem_pool_flush(pool, 1);
- ret = 0;
-out:
- return ret;
-}
-
-static LIST_HEAD(tmem_global_pool_list);
-
-/*
- * Create a new tmem_pool with the provided flag and return
- * a pool id provided by the tmem host implementation.
- */
-void tmem_new_pool(struct tmem_pool *pool, uint32_t flags)
-{
- int persistent = flags & TMEM_POOL_PERSIST;
- int shared = flags & TMEM_POOL_SHARED;
- struct tmem_hashbucket *hb = &pool->hashbucket[0];
- int i;
-
- for (i = 0; i < TMEM_HASH_BUCKETS; i++, hb++) {
- hb->obj_rb_root = RB_ROOT;
- spin_lock_init(&hb->lock);
- }
- INIT_LIST_HEAD(&pool->pool_list);
- atomic_set(&pool->obj_count, 0);
- SET_SENTINEL(pool, POOL);
- list_add_tail(&pool->pool_list, &tmem_global_pool_list);
- pool->persistent = persistent;
- pool->shared = shared;
-}
diff --git a/drivers/staging/ramster/tmem.h b/drivers/staging/ramster/tmem.h
deleted file mode 100644
index 47f1918..0000000
--- a/drivers/staging/ramster/tmem.h
+++ /dev/null
@@ -1,244 +0,0 @@
-/*
- * tmem.h
- *
- * Transcendent memory
- *
- * Copyright (c) 2009-2011, Dan Magenheimer, Oracle Corp.
- */
-
-#ifndef _TMEM_H_
-#define _TMEM_H_
-
-#include <linux/highmem.h>
-#include <linux/hash.h>
-#include <linux/atomic.h>
-
-/*
- * These are pre-defined by the Xen<->Linux ABI
- */
-#define TMEM_PUT_PAGE 4
-#define TMEM_GET_PAGE 5
-#define TMEM_FLUSH_PAGE 6
-#define TMEM_FLUSH_OBJECT 7
-#define TMEM_POOL_PERSIST 1
-#define TMEM_POOL_SHARED 2
-#define TMEM_POOL_PRECOMPRESSED 4
-#define TMEM_POOL_PAGESIZE_SHIFT 4
-#define TMEM_POOL_PAGESIZE_MASK 0xf
-#define TMEM_POOL_RESERVED_BITS 0x00ffff00
-
-/*
- * sentinels have proven very useful for debugging but can be removed
- * or disabled before final merge.
- */
-#define SENTINELS
-#ifdef SENTINELS
-#define DECL_SENTINEL uint32_t sentinel;
-#define SET_SENTINEL(_x, _y) (_x->sentinel = _y##_SENTINEL)
-#define INVERT_SENTINEL(_x, _y) (_x->sentinel = ~_y##_SENTINEL)
-#define ASSERT_SENTINEL(_x, _y) WARN_ON(_x->sentinel != _y##_SENTINEL)
-#define ASSERT_INVERTED_SENTINEL(_x, _y) WARN_ON(_x->sentinel != ~_y##_SENTINEL)
-#else
-#define DECL_SENTINEL
-#define SET_SENTINEL(_x, _y) do { } while (0)
-#define INVERT_SENTINEL(_x, _y) do { } while (0)
-#define ASSERT_SENTINEL(_x, _y) do { } while (0)
-#define ASSERT_INVERTED_SENTINEL(_x, _y) do { } while (0)
-#endif
-
-#define ASSERT_SPINLOCK(_l) WARN_ON(!spin_is_locked(_l))
-
-/*
- * A pool is the highest-level data structure managed by tmem and
- * usually corresponds to a large independent set of pages such as
- * a filesystem. Each pool has an id, and certain attributes and counters.
- * It also contains a set of hash buckets, each of which contains an rbtree
- * of objects and a lock to manage concurrency within the pool.
- */
-
-#define TMEM_HASH_BUCKET_BITS 8
-#define TMEM_HASH_BUCKETS (1<<TMEM_HASH_BUCKET_BITS)
-
-struct tmem_hashbucket {
- struct rb_root obj_rb_root;
- spinlock_t lock;
-};
-
-struct tmem_pool {
- void *client; /* "up" for some clients, avoids table lookup */
- struct list_head pool_list;
- uint32_t pool_id;
- bool persistent;
- bool shared;
- atomic_t obj_count;
- atomic_t refcount;
- struct tmem_hashbucket hashbucket[TMEM_HASH_BUCKETS];
- DECL_SENTINEL
-};
-
-#define is_persistent(_p) (_p->persistent)
-#define is_ephemeral(_p) (!(_p->persistent))
-
-/*
- * An object id ("oid") is large: 192-bits (to ensure, for example, files
- * in a modern filesystem can be uniquely identified).
- */
-
-struct tmem_oid {
- uint64_t oid[3];
-};
-
-struct tmem_xhandle {
- uint8_t client_id;
- uint8_t xh_data_cksum;
- uint16_t xh_data_size;
- uint16_t pool_id;
- struct tmem_oid oid;
- uint32_t index;
- void *extra;
-};
-
-static inline struct tmem_xhandle tmem_xhandle_fill(uint16_t client_id,
- struct tmem_pool *pool,
- struct tmem_oid *oidp,
- uint32_t index)
-{
- struct tmem_xhandle xh;
- xh.client_id = client_id;
- xh.xh_data_cksum = (uint8_t)-1;
- xh.xh_data_size = (uint16_t)-1;
- xh.pool_id = pool->pool_id;
- xh.oid = *oidp;
- xh.index = index;
- return xh;
-}
-
-static inline void tmem_oid_set_invalid(struct tmem_oid *oidp)
-{
- oidp->oid[0] = oidp->oid[1] = oidp->oid[2] = -1UL;
-}
-
-static inline bool tmem_oid_valid(struct tmem_oid *oidp)
-{
- return oidp->oid[0] != -1UL || oidp->oid[1] != -1UL ||
- oidp->oid[2] != -1UL;
-}
-
-static inline int tmem_oid_compare(struct tmem_oid *left,
- struct tmem_oid *right)
-{
- int ret;
-
- if (left->oid[2] == right->oid[2]) {
- if (left->oid[1] == right->oid[1]) {
- if (left->oid[0] == right->oid[0])
- ret = 0;
- else if (left->oid[0] < right->oid[0])
- ret = -1;
- else
- return 1;
- } else if (left->oid[1] < right->oid[1])
- ret = -1;
- else
- ret = 1;
- } else if (left->oid[2] < right->oid[2])
- ret = -1;
- else
- ret = 1;
- return ret;
-}
-
-static inline unsigned tmem_oid_hash(struct tmem_oid *oidp)
-{
- return hash_long(oidp->oid[0] ^ oidp->oid[1] ^ oidp->oid[2],
- TMEM_HASH_BUCKET_BITS);
-}
-
-/*
- * A tmem_obj contains an identifier (oid), pointers to the parent
- * pool and the rb_tree to which it belongs, counters, and an ordered
- * set of pampds, structured in a radix-tree-like tree. The intermediate
- * nodes of the tree are called tmem_objnodes.
- */
-
-struct tmem_objnode;
-
-struct tmem_obj {
- struct tmem_oid oid;
- struct tmem_pool *pool;
- struct rb_node rb_tree_node;
- struct tmem_objnode *objnode_tree_root;
- unsigned int objnode_tree_height;
- unsigned long objnode_count;
- long pampd_count;
- /* for current design of ramster, all pages belonging to
- * an object reside on the same remotenode and extra is
- * used to record the number of the remotenode so a
- * flush-object operation can specify it */
- void *extra; /* for use by pampd implementation */
- DECL_SENTINEL
-};
-
-#define OBJNODE_TREE_MAP_SHIFT 6
-#define OBJNODE_TREE_MAP_SIZE (1UL << OBJNODE_TREE_MAP_SHIFT)
-#define OBJNODE_TREE_MAP_MASK (OBJNODE_TREE_MAP_SIZE-1)
-#define OBJNODE_TREE_INDEX_BITS (8 /* CHAR_BIT */ * sizeof(unsigned long))
-#define OBJNODE_TREE_MAX_PATH \
- (OBJNODE_TREE_INDEX_BITS/OBJNODE_TREE_MAP_SHIFT + 2)
-
-struct tmem_objnode {
- struct tmem_obj *obj;
- DECL_SENTINEL
- void *slots[OBJNODE_TREE_MAP_SIZE];
- unsigned int slots_in_use;
-};
-
-/* pampd abstract datatype methods provided by the PAM implementation */
-struct tmem_pamops {
- void *(*create)(char *, size_t, bool, int,
- struct tmem_pool *, struct tmem_oid *, uint32_t);
- int (*get_data)(char *, size_t *, bool, void *, struct tmem_pool *,
- struct tmem_oid *, uint32_t);
- int (*get_data_and_free)(char *, size_t *, bool, void *,
- struct tmem_pool *, struct tmem_oid *,
- uint32_t);
- void (*free)(void *, struct tmem_pool *,
- struct tmem_oid *, uint32_t, bool);
- void (*free_obj)(struct tmem_pool *, struct tmem_obj *);
- bool (*is_remote)(void *);
- void *(*repatriate_preload)(void *, struct tmem_pool *,
- struct tmem_oid *, uint32_t, bool *);
- int (*repatriate)(void *, void *, struct tmem_pool *,
- struct tmem_oid *, uint32_t, bool, void *);
- void (*new_obj)(struct tmem_obj *);
- int (*replace_in_obj)(void *, struct tmem_obj *);
-};
-extern void tmem_register_pamops(struct tmem_pamops *m);
-
-/* memory allocation methods provided by the host implementation */
-struct tmem_hostops {
- struct tmem_obj *(*obj_alloc)(struct tmem_pool *);
- void (*obj_free)(struct tmem_obj *, struct tmem_pool *);
- struct tmem_objnode *(*objnode_alloc)(struct tmem_pool *);
- void (*objnode_free)(struct tmem_objnode *, struct tmem_pool *);
-};
-extern void tmem_register_hostops(struct tmem_hostops *m);
-
-/* core tmem accessor functions */
-extern int tmem_put(struct tmem_pool *, struct tmem_oid *, uint32_t index,
- char *, size_t, bool, int);
-extern int tmem_get(struct tmem_pool *, struct tmem_oid *, uint32_t index,
- char *, size_t *, bool, int);
-extern int tmem_replace(struct tmem_pool *, struct tmem_oid *, uint32_t index,
- void *);
-extern void *tmem_localify_get_pampd(struct tmem_pool *, struct tmem_oid *,
- uint32_t index, struct tmem_obj **,
- void **);
-extern void tmem_localify_finish(struct tmem_obj *, uint32_t index,
- void *, void *, bool);
-extern int tmem_flush_page(struct tmem_pool *, struct tmem_oid *,
- uint32_t index);
-extern int tmem_flush_object(struct tmem_pool *, struct tmem_oid *);
-extern int tmem_destroy_pool(struct tmem_pool *);
-extern void tmem_new_pool(struct tmem_pool *, uint32_t);
-#endif /* _TMEM_H */
diff --git a/drivers/staging/ramster/xvmalloc.c b/drivers/staging/ramster/xvmalloc.c
deleted file mode 100644
index 44ceb0b..0000000
--- a/drivers/staging/ramster/xvmalloc.c
+++ /dev/null
@@ -1,509 +0,0 @@
-/*
- * xvmalloc memory allocator
- *
- * Copyright (C) 2008, 2009, 2010 Nitin Gupta
- *
- * This code is released using a dual license strategy: BSD/GPL
- * You can choose the licence that better fits your requirements.
- *
- * Released under the terms of 3-clause BSD License
- * Released under the terms of GNU General Public License Version 2.0
- */
-
-#ifdef CONFIG_ZRAM_DEBUG
-#define DEBUG
-#endif
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/bitops.h>
-#include <linux/errno.h>
-#include <linux/highmem.h>
-#include <linux/init.h>
-#include <linux/string.h>
-#include <linux/slab.h>
-
-#include "xvmalloc.h"
-#include "xvmalloc_int.h"
-
-static void stat_inc(u64 *value)
-{
- *value = *value + 1;
-}
-
-static void stat_dec(u64 *value)
-{
- *value = *value - 1;
-}
-
-static int test_flag(struct block_header *block, enum blockflags flag)
-{
- return block->prev & BIT(flag);
-}
-
-static void set_flag(struct block_header *block, enum blockflags flag)
-{
- block->prev |= BIT(flag);
-}
-
-static void clear_flag(struct block_header *block, enum blockflags flag)
-{
- block->prev &= ~BIT(flag);
-}
-
-/*
- * Given <page, offset> pair, provide a dereferencable pointer.
- * This is called from xv_malloc/xv_free path, so it
- * needs to be fast.
- */
-static void *get_ptr_atomic(struct page *page, u16 offset)
-{
- unsigned char *base;
-
- base = kmap_atomic(page);
- return base + offset;
-}
-
-static void put_ptr_atomic(void *ptr)
-{
- kunmap_atomic(ptr);
-}
-
-static u32 get_blockprev(struct block_header *block)
-{
- return block->prev & PREV_MASK;
-}
-
-static void set_blockprev(struct block_header *block, u16 new_offset)
-{
- block->prev = new_offset | (block->prev & FLAGS_MASK);
-}
-
-static struct block_header *BLOCK_NEXT(struct block_header *block)
-{
- return (struct block_header *)
- ((char *)block + block->size + XV_ALIGN);
-}
-
-/*
- * Get index of free list containing blocks of maximum size
- * which is less than or equal to given size.
- */
-static u32 get_index_for_insert(u32 size)
-{
- if (unlikely(size > XV_MAX_ALLOC_SIZE))
- size = XV_MAX_ALLOC_SIZE;
- size &= ~FL_DELTA_MASK;
- return (size - XV_MIN_ALLOC_SIZE) >> FL_DELTA_SHIFT;
-}
-
-/*
- * Get index of free list having blocks of size greater than
- * or equal to requested size.
- */
-static u32 get_index(u32 size)
-{
- if (unlikely(size < XV_MIN_ALLOC_SIZE))
- size = XV_MIN_ALLOC_SIZE;
- size = ALIGN(size, FL_DELTA);
- return (size - XV_MIN_ALLOC_SIZE) >> FL_DELTA_SHIFT;
-}
-
-/**
- * find_block - find block of at least given size
- * @pool: memory pool to search from
- * @size: size of block required
- * @page: page containing required block
- * @offset: offset within the page where block is located.
- *
- * Searches two level bitmap to locate block of at least
- * the given size. If such a block is found, it provides
- * <page, offset> to identify this block and returns index
- * in freelist where we found this block.
- * Otherwise, returns 0 and <page, offset> params are not touched.
- */
-static u32 find_block(struct xv_pool *pool, u32 size,
- struct page **page, u32 *offset)
-{
- ulong flbitmap, slbitmap;
- u32 flindex, slindex, slbitstart;
-
- /* There are no free blocks in this pool */
- if (!pool->flbitmap)
- return 0;
-
- /* Get freelist index corresponding to this size */
- slindex = get_index(size);
- slbitmap = pool->slbitmap[slindex / BITS_PER_LONG];
- slbitstart = slindex % BITS_PER_LONG;
-
- /*
- * If freelist is not empty at this index, we found the
- * block - head of this list. This is approximate best-fit match.
- */
- if (test_bit(slbitstart, &slbitmap)) {
- *page = pool->freelist[slindex].page;
- *offset = pool->freelist[slindex].offset;
- return slindex;
- }
-
- /*
- * No best-fit found. Search a bit further in bitmap for a free block.
- * Second level bitmap consists of series of 32-bit chunks. Search
- * further in the chunk where we expected a best-fit, starting from
- * index location found above.
- */
- slbitstart++;
- slbitmap >>= slbitstart;
-
- /* Skip this search if we were already at end of this bitmap chunk */
- if ((slbitstart != BITS_PER_LONG) && slbitmap) {
- slindex += __ffs(slbitmap) + 1;
- *page = pool->freelist[slindex].page;
- *offset = pool->freelist[slindex].offset;
- return slindex;
- }
-
- /* Now do a full two-level bitmap search to find next nearest fit */
- flindex = slindex / BITS_PER_LONG;
-
- flbitmap = (pool->flbitmap) >> (flindex + 1);
- if (!flbitmap)
- return 0;
-
- flindex += __ffs(flbitmap) + 1;
- slbitmap = pool->slbitmap[flindex];
- slindex = (flindex * BITS_PER_LONG) + __ffs(slbitmap);
- *page = pool->freelist[slindex].page;
- *offset = pool->freelist[slindex].offset;
-
- return slindex;
-}
-
-/*
- * Insert block at <page, offset> in freelist of given pool.
- * freelist used depends on block size.
- */
-static void insert_block(struct xv_pool *pool, struct page *page, u32 offset,
- struct block_header *block)
-{
- u32 flindex, slindex;
- struct block_header *nextblock;
-
- slindex = get_index_for_insert(block->size);
- flindex = slindex / BITS_PER_LONG;
-
- block->link.prev_page = NULL;
- block->link.prev_offset = 0;
- block->link.next_page = pool->freelist[slindex].page;
- block->link.next_offset = pool->freelist[slindex].offset;
- pool->freelist[slindex].page = page;
- pool->freelist[slindex].offset = offset;
-
- if (block->link.next_page) {
- nextblock = get_ptr_atomic(block->link.next_page,
- block->link.next_offset);
- nextblock->link.prev_page = page;
- nextblock->link.prev_offset = offset;
- put_ptr_atomic(nextblock);
- /* If there was a next page then the free bits are set. */
- return;
- }
-
- __set_bit(slindex % BITS_PER_LONG, &pool->slbitmap[flindex]);
- __set_bit(flindex, &pool->flbitmap);
-}
-
-/*
- * Remove block from freelist. Index 'slindex' identifies the freelist.
- */
-static void remove_block(struct xv_pool *pool, struct page *page, u32 offset,
- struct block_header *block, u32 slindex)
-{
- u32 flindex = slindex / BITS_PER_LONG;
- struct block_header *tmpblock;
-
- if (block->link.prev_page) {
- tmpblock = get_ptr_atomic(block->link.prev_page,
- block->link.prev_offset);
- tmpblock->link.next_page = block->link.next_page;
- tmpblock->link.next_offset = block->link.next_offset;
- put_ptr_atomic(tmpblock);
- }
-
- if (block->link.next_page) {
- tmpblock = get_ptr_atomic(block->link.next_page,
- block->link.next_offset);
- tmpblock->link.prev_page = block->link.prev_page;
- tmpblock->link.prev_offset = block->link.prev_offset;
- put_ptr_atomic(tmpblock);
- }
-
- /* Is this block is at the head of the freelist? */
- if (pool->freelist[slindex].page == page
- && pool->freelist[slindex].offset == offset) {
-
- pool->freelist[slindex].page = block->link.next_page;
- pool->freelist[slindex].offset = block->link.next_offset;
-
- if (pool->freelist[slindex].page) {
- struct block_header *tmpblock;
- tmpblock = get_ptr_atomic(pool->freelist[slindex].page,
- pool->freelist[slindex].offset);
- tmpblock->link.prev_page = NULL;
- tmpblock->link.prev_offset = 0;
- put_ptr_atomic(tmpblock);
- } else {
- /* This freelist bucket is empty */
- __clear_bit(slindex % BITS_PER_LONG,
- &pool->slbitmap[flindex]);
- if (!pool->slbitmap[flindex])
- __clear_bit(flindex, &pool->flbitmap);
- }
- }
-
- block->link.prev_page = NULL;
- block->link.prev_offset = 0;
- block->link.next_page = NULL;
- block->link.next_offset = 0;
-}
-
-/*
- * Allocate a page and add it to freelist of given pool.
- */
-static int grow_pool(struct xv_pool *pool, gfp_t flags)
-{
- struct page *page;
- struct block_header *block;
-
- page = alloc_page(flags);
- if (unlikely(!page))
- return -ENOMEM;
-
- stat_inc(&pool->total_pages);
-
- spin_lock(&pool->lock);
- block = get_ptr_atomic(page, 0);
-
- block->size = PAGE_SIZE - XV_ALIGN;
- set_flag(block, BLOCK_FREE);
- clear_flag(block, PREV_FREE);
- set_blockprev(block, 0);
-
- insert_block(pool, page, 0, block);
-
- put_ptr_atomic(block);
- spin_unlock(&pool->lock);
-
- return 0;
-}
-
-/*
- * Create a memory pool. Allocates freelist, bitmaps and other
- * per-pool metadata.
- */
-struct xv_pool *xv_create_pool(void)
-{
- u32 ovhd_size;
- struct xv_pool *pool;
-
- ovhd_size = roundup(sizeof(*pool), PAGE_SIZE);
- pool = kzalloc(ovhd_size, GFP_KERNEL);
- if (!pool)
- return NULL;
-
- spin_lock_init(&pool->lock);
-
- return pool;
-}
-EXPORT_SYMBOL_GPL(xv_create_pool);
-
-void xv_destroy_pool(struct xv_pool *pool)
-{
- kfree(pool);
-}
-EXPORT_SYMBOL_GPL(xv_destroy_pool);
-
-/**
- * xv_malloc - Allocate block of given size from pool.
- * @pool: pool to allocate from
- * @size: size of block to allocate
- * @page: page no. that holds the object
- * @offset: location of object within page
- *
- * On success, <page, offset> identifies block allocated
- * and 0 is returned. On failure, <page, offset> is set to
- * 0 and -ENOMEM is returned.
- *
- * Allocation requests with size > XV_MAX_ALLOC_SIZE will fail.
- */
-int xv_malloc(struct xv_pool *pool, u32 size, struct page **page,
- u32 *offset, gfp_t flags)
-{
- int error;
- u32 index, tmpsize, origsize, tmpoffset;
- struct block_header *block, *tmpblock;
-
- *page = NULL;
- *offset = 0;
- origsize = size;
-
- if (unlikely(!size || size > XV_MAX_ALLOC_SIZE))
- return -ENOMEM;
-
- size = ALIGN(size, XV_ALIGN);
-
- spin_lock(&pool->lock);
-
- index = find_block(pool, size, page, offset);
-
- if (!*page) {
- spin_unlock(&pool->lock);
- if (flags & GFP_NOWAIT)
- return -ENOMEM;
- error = grow_pool(pool, flags);
- if (unlikely(error))
- return error;
-
- spin_lock(&pool->lock);
- index = find_block(pool, size, page, offset);
- }
-
- if (!*page) {
- spin_unlock(&pool->lock);
- return -ENOMEM;
- }
-
- block = get_ptr_atomic(*page, *offset);
-
- remove_block(pool, *page, *offset, block, index);
-
- /* Split the block if required */
- tmpoffset = *offset + size + XV_ALIGN;
- tmpsize = block->size - size;
- tmpblock = (struct block_header *)((char *)block + size + XV_ALIGN);
- if (tmpsize) {
- tmpblock->size = tmpsize - XV_ALIGN;
- set_flag(tmpblock, BLOCK_FREE);
- clear_flag(tmpblock, PREV_FREE);
-
- set_blockprev(tmpblock, *offset);
- if (tmpblock->size >= XV_MIN_ALLOC_SIZE)
- insert_block(pool, *page, tmpoffset, tmpblock);
-
- if (tmpoffset + XV_ALIGN + tmpblock->size != PAGE_SIZE) {
- tmpblock = BLOCK_NEXT(tmpblock);
- set_blockprev(tmpblock, tmpoffset);
- }
- } else {
- /* This block is exact fit */
- if (tmpoffset != PAGE_SIZE)
- clear_flag(tmpblock, PREV_FREE);
- }
-
- block->size = origsize;
- clear_flag(block, BLOCK_FREE);
-
- put_ptr_atomic(block);
- spin_unlock(&pool->lock);
-
- *offset += XV_ALIGN;
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(xv_malloc);
-
-/*
- * Free block identified with <page, offset>
- */
-void xv_free(struct xv_pool *pool, struct page *page, u32 offset)
-{
- void *page_start;
- struct block_header *block, *tmpblock;
-
- offset -= XV_ALIGN;
-
- spin_lock(&pool->lock);
-
- page_start = get_ptr_atomic(page, 0);
- block = (struct block_header *)((char *)page_start + offset);
-
- /* Catch double free bugs */
- BUG_ON(test_flag(block, BLOCK_FREE));
-
- block->size = ALIGN(block->size, XV_ALIGN);
-
- tmpblock = BLOCK_NEXT(block);
- if (offset + block->size + XV_ALIGN == PAGE_SIZE)
- tmpblock = NULL;
-
- /* Merge next block if its free */
- if (tmpblock && test_flag(tmpblock, BLOCK_FREE)) {
- /*
- * Blocks smaller than XV_MIN_ALLOC_SIZE
- * are not inserted in any free list.
- */
- if (tmpblock->size >= XV_MIN_ALLOC_SIZE) {
- remove_block(pool, page,
- offset + block->size + XV_ALIGN, tmpblock,
- get_index_for_insert(tmpblock->size));
- }
- block->size += tmpblock->size + XV_ALIGN;
- }
-
- /* Merge previous block if its free */
- if (test_flag(block, PREV_FREE)) {
- tmpblock = (struct block_header *)((char *)(page_start) +
- get_blockprev(block));
- offset = offset - tmpblock->size - XV_ALIGN;
-
- if (tmpblock->size >= XV_MIN_ALLOC_SIZE)
- remove_block(pool, page, offset, tmpblock,
- get_index_for_insert(tmpblock->size));
-
- tmpblock->size += block->size + XV_ALIGN;
- block = tmpblock;
- }
-
- /* No used objects in this page. Free it. */
- if (block->size == PAGE_SIZE - XV_ALIGN) {
- put_ptr_atomic(page_start);
- spin_unlock(&pool->lock);
-
- __free_page(page);
- stat_dec(&pool->total_pages);
- return;
- }
-
- set_flag(block, BLOCK_FREE);
- if (block->size >= XV_MIN_ALLOC_SIZE)
- insert_block(pool, page, offset, block);
-
- if (offset + block->size + XV_ALIGN != PAGE_SIZE) {
- tmpblock = BLOCK_NEXT(block);
- set_flag(tmpblock, PREV_FREE);
- set_blockprev(tmpblock, offset);
- }
-
- put_ptr_atomic(page_start);
- spin_unlock(&pool->lock);
-}
-EXPORT_SYMBOL_GPL(xv_free);
-
-u32 xv_get_object_size(void *obj)
-{
- struct block_header *blk;
-
- blk = (struct block_header *)((char *)(obj) - XV_ALIGN);
- return blk->size;
-}
-EXPORT_SYMBOL_GPL(xv_get_object_size);
-
-/*
- * Returns total memory used by allocator (userdata + metadata)
- */
-u64 xv_get_total_size_bytes(struct xv_pool *pool)
-{
- return pool->total_pages << PAGE_SHIFT;
-}
-EXPORT_SYMBOL_GPL(xv_get_total_size_bytes);
diff --git a/drivers/staging/ramster/xvmalloc.h b/drivers/staging/ramster/xvmalloc.h
deleted file mode 100644
index 5b1a81a..0000000
--- a/drivers/staging/ramster/xvmalloc.h
+++ /dev/null
@@ -1,30 +0,0 @@
-/*
- * xvmalloc memory allocator
- *
- * Copyright (C) 2008, 2009, 2010 Nitin Gupta
- *
- * This code is released using a dual license strategy: BSD/GPL
- * You can choose the licence that better fits your requirements.
- *
- * Released under the terms of 3-clause BSD License
- * Released under the terms of GNU General Public License Version 2.0
- */
-
-#ifndef _XV_MALLOC_H_
-#define _XV_MALLOC_H_
-
-#include <linux/types.h>
-
-struct xv_pool;
-
-struct xv_pool *xv_create_pool(void);
-void xv_destroy_pool(struct xv_pool *pool);
-
-int xv_malloc(struct xv_pool *pool, u32 size, struct page **page,
- u32 *offset, gfp_t flags);
-void xv_free(struct xv_pool *pool, struct page *page, u32 offset);
-
-u32 xv_get_object_size(void *obj);
-u64 xv_get_total_size_bytes(struct xv_pool *pool);
-
-#endif
diff --git a/drivers/staging/ramster/xvmalloc_int.h b/drivers/staging/ramster/xvmalloc_int.h
deleted file mode 100644
index b5f1f7f..0000000
--- a/drivers/staging/ramster/xvmalloc_int.h
+++ /dev/null
@@ -1,95 +0,0 @@
-/*
- * xvmalloc memory allocator
- *
- * Copyright (C) 2008, 2009, 2010 Nitin Gupta
- *
- * This code is released using a dual license strategy: BSD/GPL
- * You can choose the licence that better fits your requirements.
- *
- * Released under the terms of 3-clause BSD License
- * Released under the terms of GNU General Public License Version 2.0
- */
-
-#ifndef _XV_MALLOC_INT_H_
-#define _XV_MALLOC_INT_H_
-
-#include <linux/kernel.h>
-#include <linux/types.h>
-
-/* User configurable params */
-
-/* Must be power of two */
-#ifdef CONFIG_64BIT
-#define XV_ALIGN_SHIFT 3
-#else
-#define XV_ALIGN_SHIFT 2
-#endif
-#define XV_ALIGN (1 << XV_ALIGN_SHIFT)
-#define XV_ALIGN_MASK (XV_ALIGN - 1)
-
-/* This must be greater than sizeof(link_free) */
-#define XV_MIN_ALLOC_SIZE 32
-#define XV_MAX_ALLOC_SIZE (PAGE_SIZE - XV_ALIGN)
-
-/*
- * Free lists are separated by FL_DELTA bytes
- * This value is 3 for 4k pages and 4 for 64k pages, for any
- * other page size, a conservative (PAGE_SHIFT - 9) is used.
- */
-#if PAGE_SHIFT == 16
-#define FL_DELTA_SHIFT 4
-#else
-#define FL_DELTA_SHIFT (PAGE_SHIFT - 9)
-#endif
-#define FL_DELTA (1 << FL_DELTA_SHIFT)
-#define FL_DELTA_MASK (FL_DELTA - 1)
-#define NUM_FREE_LISTS ((XV_MAX_ALLOC_SIZE - XV_MIN_ALLOC_SIZE) \
- / FL_DELTA + 1)
-
-#define MAX_FLI DIV_ROUND_UP(NUM_FREE_LISTS, BITS_PER_LONG)
-
-/* End of user params */
-
-enum blockflags {
- BLOCK_FREE,
- PREV_FREE,
- __NR_BLOCKFLAGS,
-};
-
-#define FLAGS_MASK XV_ALIGN_MASK
-#define PREV_MASK (~FLAGS_MASK)
-
-struct freelist_entry {
- struct page *page;
- u16 offset;
- u16 pad;
-};
-
-struct link_free {
- struct page *prev_page;
- struct page *next_page;
- u16 prev_offset;
- u16 next_offset;
-};
-
-struct block_header {
- union {
- /* This common header must be XV_ALIGN bytes */
- u8 common[XV_ALIGN];
- struct {
- u16 size;
- u16 prev;
- };
- };
- struct link_free link;
-};
-
-struct xv_pool {
- ulong flbitmap;
- ulong slbitmap[MAX_FLI];
- u64 total_pages; /* stats */
- struct freelist_entry freelist[NUM_FREE_LISTS];
- spinlock_t lock;
-};
-
-#endif
diff --git a/drivers/staging/ramster/zcache-main.c b/drivers/staging/ramster/zcache-main.c
deleted file mode 100644
index d46764b..0000000
--- a/drivers/staging/ramster/zcache-main.c
+++ /dev/null
@@ -1,3320 +0,0 @@
-/*
- * zcache.c
- *
- * Copyright (c) 2010-2012, Dan Magenheimer, Oracle Corp.
- * Copyright (c) 2010,2011, Nitin Gupta
- *
- * Zcache provides an in-kernel "host implementation" for transcendent memory
- * and, thus indirectly, for cleancache and frontswap. Zcache includes two
- * page-accessible memory [1] interfaces, both utilizing lzo1x compression:
- * 1) "compression buddies" ("zbud") is used for ephemeral pages
- * 2) xvmalloc is used for persistent pages.
- * Xvmalloc (based on the TLSF allocator) has very low fragmentation
- * so maximizes space efficiency, while zbud allows pairs (and potentially,
- * in the future, more than a pair of) compressed pages to be closely linked
- * so that reclaiming can be done via the kernel's physical-page-oriented
- * "shrinker" interface.
- *
- * [1] For a definition of page-accessible memory (aka PAM), see:
- * http://marc.info/?l=linux-mm&m=127811271605009
- * RAMSTER TODO:
- * - handle remotifying of buddied pages (see zbud_remotify_zbpg)
- * - kernel boot params: nocleancache/nofrontswap don't always work?!?
- */
-
-#include <linux/module.h>
-#include <linux/cpu.h>
-#include <linux/highmem.h>
-#include <linux/list.h>
-#include <linux/lzo.h>
-#include <linux/slab.h>
-#include <linux/spinlock.h>
-#include <linux/types.h>
-#include <linux/atomic.h>
-#include <linux/math64.h>
-#include "tmem.h"
-#include "zcache.h"
-#include "ramster.h"
-#include "cluster/tcp.h"
-
-#include "xvmalloc.h" /* temporary until change to zsmalloc */
-
-#define RAMSTER_TESTING
-
-#if (!defined(CONFIG_CLEANCACHE) && !defined(CONFIG_FRONTSWAP))
-#error "ramster is useless without CONFIG_CLEANCACHE or CONFIG_FRONTSWAP"
-#endif
-#ifdef CONFIG_CLEANCACHE
-#include <linux/cleancache.h>
-#endif
-#ifdef CONFIG_FRONTSWAP
-#include <linux/frontswap.h>
-#endif
-
-enum ramster_remotify_op {
- RAMSTER_REMOTIFY_EPH_PUT,
- RAMSTER_REMOTIFY_PERS_PUT,
- RAMSTER_REMOTIFY_FLUSH_PAGE,
- RAMSTER_REMOTIFY_FLUSH_OBJ,
- RAMSTER_INTRANSIT_PERS
-};
-
-struct ramster_remotify_hdr {
- enum ramster_remotify_op op;
- struct list_head list;
-};
-
-#define ZBH_SENTINEL 0x43214321
-#define ZBPG_SENTINEL 0xdeadbeef
-
-#define ZBUD_MAX_BUDS 2
-
-struct zbud_hdr {
- struct ramster_remotify_hdr rem_op;
- uint16_t client_id;
- uint16_t pool_id;
- struct tmem_oid oid;
- uint32_t index;
- uint16_t size; /* compressed size in bytes, zero means unused */
- DECL_SENTINEL
-};
-
-#define ZVH_SENTINEL 0x43214321
-static const int zv_max_page_size = (PAGE_SIZE / 8) * 7;
-
-struct zv_hdr {
- struct ramster_remotify_hdr rem_op;
- uint16_t client_id;
- uint16_t pool_id;
- struct tmem_oid oid;
- uint32_t index;
- DECL_SENTINEL
-};
-
-struct flushlist_node {
- struct ramster_remotify_hdr rem_op;
- struct tmem_xhandle xh;
-};
-
-union {
- struct ramster_remotify_hdr rem_op;
- struct zv_hdr zv;
- struct zbud_hdr zbud;
- struct flushlist_node flist;
-} remotify_list_node;
-
-static LIST_HEAD(zcache_rem_op_list);
-static DEFINE_SPINLOCK(zcache_rem_op_list_lock);
-
-#if 0
-/* this is more aggressive but may cause other problems? */
-#define ZCACHE_GFP_MASK (GFP_ATOMIC | __GFP_NORETRY | __GFP_NOWARN)
-#else
-#define ZCACHE_GFP_MASK \
- (__GFP_FS | __GFP_NORETRY | __GFP_NOWARN | __GFP_NOMEMALLOC)
-#endif
-
-#define MAX_POOLS_PER_CLIENT 16
-
-#define MAX_CLIENTS 16
-#define LOCAL_CLIENT ((uint16_t)-1)
-
-MODULE_LICENSE("GPL");
-
-struct zcache_client {
- struct tmem_pool *tmem_pools[MAX_POOLS_PER_CLIENT];
- struct xv_pool *xvpool;
- bool allocated;
- atomic_t refcount;
-};
-
-static struct zcache_client zcache_host;
-static struct zcache_client zcache_clients[MAX_CLIENTS];
-
-static inline uint16_t get_client_id_from_client(struct zcache_client *cli)
-{
- BUG_ON(cli == NULL);
- if (cli == &zcache_host)
- return LOCAL_CLIENT;
- return cli - &zcache_clients[0];
-}
-
-static inline bool is_local_client(struct zcache_client *cli)
-{
- return cli == &zcache_host;
-}
-
-/**********
- * Compression buddies ("zbud") provides for packing two (or, possibly
- * in the future, more) compressed ephemeral pages into a single "raw"
- * (physical) page and tracking them with data structures so that
- * the raw pages can be easily reclaimed.
- *
- * A zbud page ("zbpg") is an aligned page containing a list_head,
- * a lock, and two "zbud headers". The remainder of the physical
- * page is divided up into aligned 64-byte "chunks" which contain
- * the compressed data for zero, one, or two zbuds. Each zbpg
- * resides on: (1) an "unused list" if it has no zbuds; (2) a
- * "buddied" list if it is fully populated with two zbuds; or
- * (3) one of PAGE_SIZE/64 "unbuddied" lists indexed by how many chunks
- * the one unbuddied zbud uses. The data inside a zbpg cannot be
- * read or written unless the zbpg's lock is held.
- */
-
-struct zbud_page {
- struct list_head bud_list;
- spinlock_t lock;
- struct zbud_hdr buddy[ZBUD_MAX_BUDS];
- DECL_SENTINEL
- /* followed by NUM_CHUNK aligned CHUNK_SIZE-byte chunks */
-};
-
-#define CHUNK_SHIFT 6
-#define CHUNK_SIZE (1 << CHUNK_SHIFT)
-#define CHUNK_MASK (~(CHUNK_SIZE-1))
-#define NCHUNKS (((PAGE_SIZE - sizeof(struct zbud_page)) & \
- CHUNK_MASK) >> CHUNK_SHIFT)
-#define MAX_CHUNK (NCHUNKS-1)
-
-static struct {
- struct list_head list;
- unsigned count;
-} zbud_unbuddied[NCHUNKS];
-/* list N contains pages with N chunks USED and NCHUNKS-N unused */
-/* element 0 is never used but optimizing that isn't worth it */
-static unsigned long zbud_cumul_chunk_counts[NCHUNKS];
-
-struct list_head zbud_buddied_list;
-static unsigned long zcache_zbud_buddied_count;
-
-/* protects the buddied list and all unbuddied lists */
-static DEFINE_SPINLOCK(zbud_budlists_spinlock);
-
-static atomic_t zcache_zbud_curr_raw_pages;
-static atomic_t zcache_zbud_curr_zpages;
-static unsigned long zcache_zbud_curr_zbytes;
-static unsigned long zcache_zbud_cumul_zpages;
-static unsigned long zcache_zbud_cumul_zbytes;
-static unsigned long zcache_compress_poor;
-static unsigned long zcache_policy_percent_exceeded;
-static unsigned long zcache_mean_compress_poor;
-
-/*
- * RAMster counters
- * - Remote pages are pages with a local pampd but the data is remote
- * - Foreign pages are pages stored locally but belonging to another node
- */
-static atomic_t ramster_remote_pers_pages = ATOMIC_INIT(0);
-static unsigned long ramster_pers_remotify_enable;
-static unsigned long ramster_eph_remotify_enable;
-static unsigned long ramster_eph_pages_remoted;
-static unsigned long ramster_eph_pages_remote_failed;
-static unsigned long ramster_pers_pages_remoted;
-static unsigned long ramster_pers_pages_remote_failed;
-static unsigned long ramster_pers_pages_remote_nomem;
-static unsigned long ramster_remote_objects_flushed;
-static unsigned long ramster_remote_object_flushes_failed;
-static unsigned long ramster_remote_pages_flushed;
-static unsigned long ramster_remote_page_flushes_failed;
-static unsigned long ramster_remote_eph_pages_succ_get;
-static unsigned long ramster_remote_pers_pages_succ_get;
-static unsigned long ramster_remote_eph_pages_unsucc_get;
-static unsigned long ramster_remote_pers_pages_unsucc_get;
-static atomic_t ramster_curr_flnode_count = ATOMIC_INIT(0);
-static unsigned long ramster_curr_flnode_count_max;
-static atomic_t ramster_foreign_eph_pampd_count = ATOMIC_INIT(0);
-static unsigned long ramster_foreign_eph_pampd_count_max;
-static atomic_t ramster_foreign_pers_pampd_count = ATOMIC_INIT(0);
-static unsigned long ramster_foreign_pers_pampd_count_max;
-
-/* forward references */
-static void *zcache_get_free_page(void);
-static void zcache_free_page(void *p);
-
-/*
- * zbud helper functions
- */
-
-static inline unsigned zbud_max_buddy_size(void)
-{
- return MAX_CHUNK << CHUNK_SHIFT;
-}
-
-static inline unsigned zbud_size_to_chunks(unsigned size)
-{
- BUG_ON(size == 0 || size > zbud_max_buddy_size());
- return (size + CHUNK_SIZE - 1) >> CHUNK_SHIFT;
-}
-
-static inline int zbud_budnum(struct zbud_hdr *zh)
-{
- unsigned offset = (unsigned long)zh & (PAGE_SIZE - 1);
- struct zbud_page *zbpg = NULL;
- unsigned budnum = -1U;
- int i;
-
- for (i = 0; i < ZBUD_MAX_BUDS; i++)
- if (offset == offsetof(typeof(*zbpg), buddy[i])) {
- budnum = i;
- break;
- }
- BUG_ON(budnum == -1U);
- return budnum;
-}
-
-static char *zbud_data(struct zbud_hdr *zh, unsigned size)
-{
- struct zbud_page *zbpg;
- char *p;
- unsigned budnum;
-
- ASSERT_SENTINEL(zh, ZBH);
- budnum = zbud_budnum(zh);
- BUG_ON(size == 0 || size > zbud_max_buddy_size());
- zbpg = container_of(zh, struct zbud_page, buddy[budnum]);
- ASSERT_SPINLOCK(&zbpg->lock);
- p = (char *)zbpg;
- if (budnum == 0)
- p += ((sizeof(struct zbud_page) + CHUNK_SIZE - 1) &
- CHUNK_MASK);
- else if (budnum == 1)
- p += PAGE_SIZE - ((size + CHUNK_SIZE - 1) & CHUNK_MASK);
- return p;
-}
-
-static void zbud_copy_from_pampd(char *data, size_t *size, struct zbud_hdr *zh)
-{
- struct zbud_page *zbpg;
- char *p;
- unsigned budnum;
-
- ASSERT_SENTINEL(zh, ZBH);
- budnum = zbud_budnum(zh);
- zbpg = container_of(zh, struct zbud_page, buddy[budnum]);
- spin_lock(&zbpg->lock);
- BUG_ON(zh->size > *size);
- p = (char *)zbpg;
- if (budnum == 0)
- p += ((sizeof(struct zbud_page) + CHUNK_SIZE - 1) &
- CHUNK_MASK);
- else if (budnum == 1)
- p += PAGE_SIZE - ((zh->size + CHUNK_SIZE - 1) & CHUNK_MASK);
- /* client should be filled in by caller */
- memcpy(data, p, zh->size);
- *size = zh->size;
- spin_unlock(&zbpg->lock);
-}
-
-/*
- * zbud raw page management
- */
-
-static struct zbud_page *zbud_alloc_raw_page(void)
-{
- struct zbud_page *zbpg = NULL;
- struct zbud_hdr *zh0, *zh1;
- zbpg = zcache_get_free_page();
- if (likely(zbpg != NULL)) {
- INIT_LIST_HEAD(&zbpg->bud_list);
- zh0 = &zbpg->buddy[0]; zh1 = &zbpg->buddy[1];
- spin_lock_init(&zbpg->lock);
- atomic_inc(&zcache_zbud_curr_raw_pages);
- INIT_LIST_HEAD(&zbpg->bud_list);
- SET_SENTINEL(zbpg, ZBPG);
- zh0->size = 0; zh1->size = 0;
- tmem_oid_set_invalid(&zh0->oid);
- tmem_oid_set_invalid(&zh1->oid);
- }
- return zbpg;
-}
-
-static void zbud_free_raw_page(struct zbud_page *zbpg)
-{
- struct zbud_hdr *zh0 = &zbpg->buddy[0], *zh1 = &zbpg->buddy[1];
-
- ASSERT_SENTINEL(zbpg, ZBPG);
- BUG_ON(!list_empty(&zbpg->bud_list));
- ASSERT_SPINLOCK(&zbpg->lock);
- BUG_ON(zh0->size != 0 || tmem_oid_valid(&zh0->oid));
- BUG_ON(zh1->size != 0 || tmem_oid_valid(&zh1->oid));
- INVERT_SENTINEL(zbpg, ZBPG);
- spin_unlock(&zbpg->lock);
- atomic_dec(&zcache_zbud_curr_raw_pages);
- zcache_free_page(zbpg);
-}
-
-/*
- * core zbud handling routines
- */
-
-static unsigned zbud_free(struct zbud_hdr *zh)
-{
- unsigned size;
-
- ASSERT_SENTINEL(zh, ZBH);
- BUG_ON(!tmem_oid_valid(&zh->oid));
- size = zh->size;
- BUG_ON(zh->size == 0 || zh->size > zbud_max_buddy_size());
- zh->size = 0;
- tmem_oid_set_invalid(&zh->oid);
- INVERT_SENTINEL(zh, ZBH);
- zcache_zbud_curr_zbytes -= size;
- atomic_dec(&zcache_zbud_curr_zpages);
- return size;
-}
-
-static void zbud_free_and_delist(struct zbud_hdr *zh)
-{
- unsigned chunks;
- struct zbud_hdr *zh_other;
- unsigned budnum = zbud_budnum(zh), size;
- struct zbud_page *zbpg =
- container_of(zh, struct zbud_page, buddy[budnum]);
-
- /* FIXME, should be BUG_ON, pool destruction path doesn't disable
- * interrupts tmem_destroy_pool()->tmem_pampd_destroy_all_in_obj()->
- * tmem_objnode_node_destroy()-> zcache_pampd_free() */
- WARN_ON(!irqs_disabled());
- spin_lock(&zbpg->lock);
- if (list_empty(&zbpg->bud_list)) {
- /* ignore zombie page... see zbud_evict_pages() */
- spin_unlock(&zbpg->lock);
- return;
- }
- size = zbud_free(zh);
- ASSERT_SPINLOCK(&zbpg->lock);
- zh_other = &zbpg->buddy[(budnum == 0) ? 1 : 0];
- if (zh_other->size == 0) { /* was unbuddied: unlist and free */
- chunks = zbud_size_to_chunks(size) ;
- spin_lock(&zbud_budlists_spinlock);
- BUG_ON(list_empty(&zbud_unbuddied[chunks].list));
- list_del_init(&zbpg->bud_list);
- zbud_unbuddied[chunks].count--;
- spin_unlock(&zbud_budlists_spinlock);
- zbud_free_raw_page(zbpg);
- } else { /* was buddied: move remaining buddy to unbuddied list */
- chunks = zbud_size_to_chunks(zh_other->size) ;
- spin_lock(&zbud_budlists_spinlock);
- list_del_init(&zbpg->bud_list);
- zcache_zbud_buddied_count--;
- list_add_tail(&zbpg->bud_list, &zbud_unbuddied[chunks].list);
- zbud_unbuddied[chunks].count++;
- spin_unlock(&zbud_budlists_spinlock);
- spin_unlock(&zbpg->lock);
- }
-}
-
-static struct zbud_hdr *zbud_create(uint16_t client_id, uint16_t pool_id,
- struct tmem_oid *oid,
- uint32_t index, struct page *page,
- void *cdata, unsigned size)
-{
- struct zbud_hdr *zh0, *zh1, *zh = NULL;
- struct zbud_page *zbpg = NULL, *ztmp;
- unsigned nchunks;
- char *to;
- int i, found_good_buddy = 0;
-
- nchunks = zbud_size_to_chunks(size) ;
- for (i = MAX_CHUNK - nchunks + 1; i > 0; i--) {
- spin_lock(&zbud_budlists_spinlock);
- if (!list_empty(&zbud_unbuddied[i].list)) {
- list_for_each_entry_safe(zbpg, ztmp,
- &zbud_unbuddied[i].list, bud_list) {
- if (spin_trylock(&zbpg->lock)) {
- found_good_buddy = i;
- goto found_unbuddied;
- }
- }
- }
- spin_unlock(&zbud_budlists_spinlock);
- }
- /* didn't find a good buddy, try allocating a new page */
- zbpg = zbud_alloc_raw_page();
- if (unlikely(zbpg == NULL))
- goto out;
- /* ok, have a page, now compress the data before taking locks */
- spin_lock(&zbud_budlists_spinlock);
- spin_lock(&zbpg->lock);
- list_add_tail(&zbpg->bud_list, &zbud_unbuddied[nchunks].list);
- zbud_unbuddied[nchunks].count++;
- zh = &zbpg->buddy[0];
- goto init_zh;
-
-found_unbuddied:
- ASSERT_SPINLOCK(&zbpg->lock);
- zh0 = &zbpg->buddy[0]; zh1 = &zbpg->buddy[1];
- BUG_ON(!((zh0->size == 0) ^ (zh1->size == 0)));
- if (zh0->size != 0) { /* buddy0 in use, buddy1 is vacant */
- ASSERT_SENTINEL(zh0, ZBH);
- zh = zh1;
- } else if (zh1->size != 0) { /* buddy1 in use, buddy0 is vacant */
- ASSERT_SENTINEL(zh1, ZBH);
- zh = zh0;
- } else
- BUG();
- list_del_init(&zbpg->bud_list);
- zbud_unbuddied[found_good_buddy].count--;
- list_add_tail(&zbpg->bud_list, &zbud_buddied_list);
- zcache_zbud_buddied_count++;
-
-init_zh:
- SET_SENTINEL(zh, ZBH);
- zh->size = size;
- zh->index = index;
- zh->oid = *oid;
- zh->pool_id = pool_id;
- zh->client_id = client_id;
- to = zbud_data(zh, size);
- memcpy(to, cdata, size);
- spin_unlock(&zbpg->lock);
- spin_unlock(&zbud_budlists_spinlock);
- zbud_cumul_chunk_counts[nchunks]++;
- atomic_inc(&zcache_zbud_curr_zpages);
- zcache_zbud_cumul_zpages++;
- zcache_zbud_curr_zbytes += size;
- zcache_zbud_cumul_zbytes += size;
-out:
- return zh;
-}
-
-static int zbud_decompress(struct page *page, struct zbud_hdr *zh)
-{
- struct zbud_page *zbpg;
- unsigned budnum = zbud_budnum(zh);
- size_t out_len = PAGE_SIZE;
- char *to_va, *from_va;
- unsigned size;
- int ret = 0;
-
- zbpg = container_of(zh, struct zbud_page, buddy[budnum]);
- spin_lock(&zbpg->lock);
- if (list_empty(&zbpg->bud_list)) {
- /* ignore zombie page... see zbud_evict_pages() */
- ret = -EINVAL;
- goto out;
- }
- ASSERT_SENTINEL(zh, ZBH);
- BUG_ON(zh->size == 0 || zh->size > zbud_max_buddy_size());
- to_va = kmap_atomic(page);
- size = zh->size;
- from_va = zbud_data(zh, size);
- ret = lzo1x_decompress_safe(from_va, size, to_va, &out_len);
- BUG_ON(ret != LZO_E_OK);
- BUG_ON(out_len != PAGE_SIZE);
- kunmap_atomic(to_va);
-out:
- spin_unlock(&zbpg->lock);
- return ret;
-}
-
-/*
- * The following routines handle shrinking of ephemeral pages by evicting
- * pages "least valuable" first.
- */
-
-static unsigned long zcache_evicted_raw_pages;
-static unsigned long zcache_evicted_buddied_pages;
-static unsigned long zcache_evicted_unbuddied_pages;
-
-static struct tmem_pool *zcache_get_pool_by_id(uint16_t cli_id,
- uint16_t poolid);
-static void zcache_put_pool(struct tmem_pool *pool);
-
-/*
- * Flush and free all zbuds in a zbpg, then free the pageframe
- */
-static void zbud_evict_zbpg(struct zbud_page *zbpg)
-{
- struct zbud_hdr *zh;
- int i, j;
- uint32_t pool_id[ZBUD_MAX_BUDS], client_id[ZBUD_MAX_BUDS];
- uint32_t index[ZBUD_MAX_BUDS];
- struct tmem_oid oid[ZBUD_MAX_BUDS];
- struct tmem_pool *pool;
- unsigned long flags;
-
- ASSERT_SPINLOCK(&zbpg->lock);
- for (i = 0, j = 0; i < ZBUD_MAX_BUDS; i++) {
- zh = &zbpg->buddy[i];
- if (zh->size) {
- client_id[j] = zh->client_id;
- pool_id[j] = zh->pool_id;
- oid[j] = zh->oid;
- index[j] = zh->index;
- j++;
- }
- }
- spin_unlock(&zbpg->lock);
- for (i = 0; i < j; i++) {
- pool = zcache_get_pool_by_id(client_id[i], pool_id[i]);
- BUG_ON(pool == NULL);
- local_irq_save(flags);
- /* these flushes should dispose of any local storage */
- tmem_flush_page(pool, &oid[i], index[i]);
- local_irq_restore(flags);
- zcache_put_pool(pool);
- }
-}
-
-/*
- * Free nr pages. This code is funky because we want to hold the locks
- * protecting various lists for as short a time as possible, and in some
- * circumstances the list may change asynchronously when the list lock is
- * not held. In some cases we also trylock not only to avoid waiting on a
- * page in use by another cpu, but also to avoid potential deadlock due to
- * lock inversion.
- */
-static void zbud_evict_pages(int nr)
-{
- struct zbud_page *zbpg;
- int i, newly_unused_pages = 0;
-
-
- /* now try freeing unbuddied pages, starting with least space avail */
- for (i = 0; i < MAX_CHUNK; i++) {
-retry_unbud_list_i:
- spin_lock_bh(&zbud_budlists_spinlock);
- if (list_empty(&zbud_unbuddied[i].list)) {
- spin_unlock_bh(&zbud_budlists_spinlock);
- continue;
- }
- list_for_each_entry(zbpg, &zbud_unbuddied[i].list, bud_list) {
- if (unlikely(!spin_trylock(&zbpg->lock)))
- continue;
- zbud_unbuddied[i].count--;
- spin_unlock(&zbud_budlists_spinlock);
- zcache_evicted_unbuddied_pages++;
- /* want budlists unlocked when doing zbpg eviction */
- zbud_evict_zbpg(zbpg);
- newly_unused_pages++;
- local_bh_enable();
- if (--nr <= 0)
- goto evict_unused;
- goto retry_unbud_list_i;
- }
- spin_unlock_bh(&zbud_budlists_spinlock);
- }
-
- /* as a last resort, free buddied pages */
-retry_bud_list:
- spin_lock_bh(&zbud_budlists_spinlock);
- if (list_empty(&zbud_buddied_list)) {
- spin_unlock_bh(&zbud_budlists_spinlock);
- goto evict_unused;
- }
- list_for_each_entry(zbpg, &zbud_buddied_list, bud_list) {
- if (unlikely(!spin_trylock(&zbpg->lock)))
- continue;
- zcache_zbud_buddied_count--;
- spin_unlock(&zbud_budlists_spinlock);
- zcache_evicted_buddied_pages++;
- /* want budlists unlocked when doing zbpg eviction */
- zbud_evict_zbpg(zbpg);
- newly_unused_pages++;
- local_bh_enable();
- if (--nr <= 0)
- goto evict_unused;
- goto retry_bud_list;
- }
- spin_unlock_bh(&zbud_budlists_spinlock);
-
-evict_unused:
- return;
-}
-
-static DEFINE_PER_CPU(unsigned char *, zcache_remoteputmem);
-
-static int zbud_remotify_zbud(struct tmem_xhandle *xh, char *data,
- size_t size)
-{
- struct tmem_pool *pool;
- int i, remotenode, ret = -1;
- unsigned char cksum, *p;
- unsigned long flags;
-
- for (p = data, cksum = 0, i = 0; i < size; i++)
- cksum += *p;
- ret = ramster_remote_put(xh, data, size, true, &remotenode);
- if (ret == 0) {
- /* data was successfully remoted so change the local version
- * to point to the remote node where it landed */
- pool = zcache_get_pool_by_id(LOCAL_CLIENT, xh->pool_id);
- BUG_ON(pool == NULL);
- local_irq_save(flags);
- /* tmem_replace will also free up any local space */
- (void)tmem_replace(pool, &xh->oid, xh->index,
- pampd_make_remote(remotenode, size, cksum));
- local_irq_restore(flags);
- zcache_put_pool(pool);
- ramster_eph_pages_remoted++;
- ret = 0;
- } else
- ramster_eph_pages_remote_failed++;
- return ret;
-}
-
-static int zbud_remotify_zbpg(struct zbud_page *zbpg)
-{
- struct zbud_hdr *zh1, *zh2 = NULL;
- struct tmem_xhandle xh1, xh2 = { 0 };
- char *data1 = NULL, *data2 = NULL;
- size_t size1 = 0, size2 = 0;
- int ret = 0;
- unsigned char *tmpmem = __get_cpu_var(zcache_remoteputmem);
-
- ASSERT_SPINLOCK(&zbpg->lock);
- if (zbpg->buddy[0].size == 0)
- zh1 = &zbpg->buddy[1];
- else if (zbpg->buddy[1].size == 0)
- zh1 = &zbpg->buddy[0];
- else {
- zh1 = &zbpg->buddy[0];
- zh2 = &zbpg->buddy[1];
- }
- /* don't remotify pages that are already remotified */
- if (zh1->client_id != LOCAL_CLIENT)
- zh1 = NULL;
- if ((zh2 != NULL) && (zh2->client_id != LOCAL_CLIENT))
- zh2 = NULL;
-
- /* copy the data and metadata so can release lock */
- if (zh1 != NULL) {
- xh1.client_id = zh1->client_id;
- xh1.pool_id = zh1->pool_id;
- xh1.oid = zh1->oid;
- xh1.index = zh1->index;
- size1 = zh1->size;
- data1 = zbud_data(zh1, size1);
- memcpy(tmpmem, zbud_data(zh1, size1), size1);
- data1 = tmpmem;
- tmpmem += size1;
- }
- if (zh2 != NULL) {
- xh2.client_id = zh2->client_id;
- xh2.pool_id = zh2->pool_id;
- xh2.oid = zh2->oid;
- xh2.index = zh2->index;
- size2 = zh2->size;
- memcpy(tmpmem, zbud_data(zh2, size2), size2);
- data2 = tmpmem;
- }
- spin_unlock(&zbpg->lock);
- preempt_enable();
-
- /* OK, no locks held anymore, remotify one or both zbuds */
- if (zh1 != NULL)
- ret = zbud_remotify_zbud(&xh1, data1, size1);
- if (zh2 != NULL)
- ret |= zbud_remotify_zbud(&xh2, data2, size2);
- return ret;
-}
-
-void zbud_remotify_pages(int nr)
-{
- struct zbud_page *zbpg;
- int i, ret;
-
- /*
- * for now just try remotifying unbuddied pages, starting with
- * least space avail
- */
- for (i = 0; i < MAX_CHUNK; i++) {
-retry_unbud_list_i:
- preempt_disable(); /* enable in zbud_remotify_zbpg */
- spin_lock_bh(&zbud_budlists_spinlock);
- if (list_empty(&zbud_unbuddied[i].list)) {
- spin_unlock_bh(&zbud_budlists_spinlock);
- preempt_enable();
- continue; /* next i in for loop */
- }
- list_for_each_entry(zbpg, &zbud_unbuddied[i].list, bud_list) {
- if (unlikely(!spin_trylock(&zbpg->lock)))
- continue; /* next list_for_each_entry */
- zbud_unbuddied[i].count--;
- /* want budlists unlocked when doing zbpg remotify */
- spin_unlock_bh(&zbud_budlists_spinlock);
- ret = zbud_remotify_zbpg(zbpg);
- /* preemption is re-enabled in zbud_remotify_zbpg */
- if (ret == 0) {
- if (--nr <= 0)
- goto out;
- goto retry_unbud_list_i;
- }
- /* if fail to remotify any page, quit */
- pr_err("TESTING zbud_remotify_pages failed on page,"
- " trying to re-add\n");
- spin_lock_bh(&zbud_budlists_spinlock);
- spin_lock(&zbpg->lock);
- list_add_tail(&zbpg->bud_list, &zbud_unbuddied[i].list);
- zbud_unbuddied[i].count++;
- spin_unlock(&zbpg->lock);
- spin_unlock_bh(&zbud_budlists_spinlock);
- pr_err("TESTING zbud_remotify_pages failed on page,"
- " finished re-add\n");
- goto out;
- }
- spin_unlock_bh(&zbud_budlists_spinlock);
- preempt_enable();
- }
-
-next_buddied_zbpg:
- preempt_disable(); /* enable in zbud_remotify_zbpg */
- spin_lock_bh(&zbud_budlists_spinlock);
- if (list_empty(&zbud_buddied_list))
- goto unlock_out;
- list_for_each_entry(zbpg, &zbud_buddied_list, bud_list) {
- if (unlikely(!spin_trylock(&zbpg->lock)))
- continue; /* next list_for_each_entry */
- zcache_zbud_buddied_count--;
- /* want budlists unlocked when doing zbpg remotify */
- spin_unlock_bh(&zbud_budlists_spinlock);
- ret = zbud_remotify_zbpg(zbpg);
- /* preemption is re-enabled in zbud_remotify_zbpg */
- if (ret == 0) {
- if (--nr <= 0)
- goto out;
- goto next_buddied_zbpg;
- }
- /* if fail to remotify any page, quit */
- pr_err("TESTING zbud_remotify_pages failed on BUDDIED page,"
- " trying to re-add\n");
- spin_lock_bh(&zbud_budlists_spinlock);
- spin_lock(&zbpg->lock);
- list_add_tail(&zbpg->bud_list, &zbud_buddied_list);
- zcache_zbud_buddied_count++;
- spin_unlock(&zbpg->lock);
- spin_unlock_bh(&zbud_budlists_spinlock);
- pr_err("TESTING zbud_remotify_pages failed on BUDDIED page,"
- " finished re-add\n");
- goto out;
- }
-unlock_out:
- spin_unlock_bh(&zbud_budlists_spinlock);
- preempt_enable();
-out:
- return;
-}
-
-/* the "flush list" asynchronously collects pages to remotely flush */
-#define FLUSH_ENTIRE_OBJECT ((uint32_t)-1)
-static void ramster_flnode_free(struct flushlist_node *,
- struct tmem_pool *);
-
-static void zcache_remote_flush_page(struct flushlist_node *flnode)
-{
- struct tmem_xhandle *xh;
- int remotenode, ret;
-
- preempt_disable();
- xh = &flnode->xh;
- remotenode = flnode->xh.client_id;
- ret = ramster_remote_flush(xh, remotenode);
- if (ret >= 0)
- ramster_remote_pages_flushed++;
- else
- ramster_remote_page_flushes_failed++;
- preempt_enable_no_resched();
- ramster_flnode_free(flnode, NULL);
-}
-
-static void zcache_remote_flush_object(struct flushlist_node *flnode)
-{
- struct tmem_xhandle *xh;
- int remotenode, ret;
-
- preempt_disable();
- xh = &flnode->xh;
- remotenode = flnode->xh.client_id;
- ret = ramster_remote_flush_object(xh, remotenode);
- if (ret >= 0)
- ramster_remote_objects_flushed++;
- else
- ramster_remote_object_flushes_failed++;
- preempt_enable_no_resched();
- ramster_flnode_free(flnode, NULL);
-}
-
-static void zcache_remote_eph_put(struct zbud_hdr *zbud)
-{
- /* FIXME */
-}
-
-static void zcache_remote_pers_put(struct zv_hdr *zv)
-{
- struct tmem_xhandle xh;
- uint16_t size;
- bool ephemeral;
- int remotenode, ret = -1;
- char *data;
- struct tmem_pool *pool;
- unsigned long flags;
- unsigned char cksum;
- char *p;
- int i;
- unsigned char *tmpmem = __get_cpu_var(zcache_remoteputmem);
-
- ASSERT_SENTINEL(zv, ZVH);
- BUG_ON(zv->client_id != LOCAL_CLIENT);
- local_bh_disable();
- xh.client_id = zv->client_id;
- xh.pool_id = zv->pool_id;
- xh.oid = zv->oid;
- xh.index = zv->index;
- size = xv_get_object_size(zv) - sizeof(*zv);
- BUG_ON(size == 0 || size > zv_max_page_size);
- data = (char *)zv + sizeof(*zv);
- for (p = data, cksum = 0, i = 0; i < size; i++)
- cksum += *p;
- memcpy(tmpmem, data, size);
- data = tmpmem;
- pool = zcache_get_pool_by_id(zv->client_id, zv->pool_id);
- ephemeral = is_ephemeral(pool);
- zcache_put_pool(pool);
- /* now OK to release lock set in caller */
- spin_unlock(&zcache_rem_op_list_lock);
- local_bh_enable();
- preempt_disable();
- ret = ramster_remote_put(&xh, data, size, ephemeral, &remotenode);
- preempt_enable_no_resched();
- if (ret != 0) {
- /*
- * This is some form of a memory leak... if the remote put
- * fails, there will never be another attempt to remotify
- * this page. But since we've dropped the zv pointer,
- * the page may have been freed or the data replaced
- * so we can't just "put it back" in the remote op list.
- * Even if we could, not sure where to put it in the list
- * because there may be flushes that must be strictly
- * ordered vs the put. So leave this as a FIXME for now.
- * But count them so we know if it becomes a problem.
- */
- ramster_pers_pages_remote_failed++;
- goto out;
- } else
- atomic_inc(&ramster_remote_pers_pages);
- ramster_pers_pages_remoted++;
- /*
- * data was successfully remoted so change the local version to
- * point to the remote node where it landed
- */
- local_bh_disable();
- pool = zcache_get_pool_by_id(LOCAL_CLIENT, xh.pool_id);
- local_irq_save(flags);
- (void)tmem_replace(pool, &xh.oid, xh.index,
- pampd_make_remote(remotenode, size, cksum));
- local_irq_restore(flags);
- zcache_put_pool(pool);
- local_bh_enable();
-out:
- return;
-}
-
-static void zcache_do_remotify_ops(int nr)
-{
- struct ramster_remotify_hdr *rem_op;
- union remotify_list_node *u;
-
- while (1) {
- if (!nr)
- goto out;
- spin_lock(&zcache_rem_op_list_lock);
- if (list_empty(&zcache_rem_op_list)) {
- spin_unlock(&zcache_rem_op_list_lock);
- goto out;
- }
- rem_op = list_first_entry(&zcache_rem_op_list,
- struct ramster_remotify_hdr, list);
- list_del_init(&rem_op->list);
- if (rem_op->op != RAMSTER_REMOTIFY_PERS_PUT)
- spin_unlock(&zcache_rem_op_list_lock);
- u = (union remotify_list_node *)rem_op;
- switch (rem_op->op) {
- case RAMSTER_REMOTIFY_EPH_PUT:
-BUG();
- zcache_remote_eph_put((struct zbud_hdr *)rem_op);
- break;
- case RAMSTER_REMOTIFY_PERS_PUT:
- zcache_remote_pers_put((struct zv_hdr *)rem_op);
- break;
- case RAMSTER_REMOTIFY_FLUSH_PAGE:
- zcache_remote_flush_page((struct flushlist_node *)u);
- break;
- case RAMSTER_REMOTIFY_FLUSH_OBJ:
- zcache_remote_flush_object((struct flushlist_node *)u);
- break;
- default:
- BUG();
- }
- }
-out:
- return;
-}
-
-/*
- * Communicate interface revision with userspace
- */
-#include "cluster/ramster_nodemanager.h"
-static unsigned long ramster_interface_revision = R2NM_API_VERSION;
-
-/*
- * For now, just push over a few pages every few seconds to
- * ensure that it basically works
- */
-static struct workqueue_struct *ramster_remotify_workqueue;
-static void ramster_remotify_process(struct work_struct *work);
-static DECLARE_DELAYED_WORK(ramster_remotify_worker,
- ramster_remotify_process);
-
-static void ramster_remotify_queue_delayed_work(unsigned long delay)
-{
- if (!queue_delayed_work(ramster_remotify_workqueue,
- &ramster_remotify_worker, delay))
- pr_err("ramster_remotify: bad workqueue\n");
-}
-
-
-static int use_frontswap;
-static int use_cleancache;
-static int ramster_remote_target_nodenum = -1;
-static void ramster_remotify_process(struct work_struct *work)
-{
- static bool remotify_in_progress;
-
- BUG_ON(irqs_disabled());
- if (remotify_in_progress)
- ramster_remotify_queue_delayed_work(HZ);
- else if (ramster_remote_target_nodenum != -1) {
- remotify_in_progress = true;
-#ifdef CONFIG_CLEANCACHE
- if (use_cleancache && ramster_eph_remotify_enable)
- zbud_remotify_pages(5000); /* FIXME is this a good number? */
-#endif
-#ifdef CONFIG_FRONTSWAP
- if (use_frontswap && ramster_pers_remotify_enable)
- zcache_do_remotify_ops(500); /* FIXME is this a good number? */
-#endif
- remotify_in_progress = false;
- ramster_remotify_queue_delayed_work(HZ);
- }
-}
-
-static void ramster_remotify_init(void)
-{
- unsigned long n = 60UL;
- ramster_remotify_workqueue =
- create_singlethread_workqueue("ramster_remotify");
- ramster_remotify_queue_delayed_work(n * HZ);
-}
-
-
-static void zbud_init(void)
-{
- int i;
-
- INIT_LIST_HEAD(&zbud_buddied_list);
- zcache_zbud_buddied_count = 0;
- for (i = 0; i < NCHUNKS; i++) {
- INIT_LIST_HEAD(&zbud_unbuddied[i].list);
- zbud_unbuddied[i].count = 0;
- }
-}
-
-#ifdef CONFIG_SYSFS
-/*
- * These sysfs routines show a nice distribution of how many zbpg's are
- * currently (and have ever been placed) in each unbuddied list. It's fun
- * to watch but can probably go away before final merge.
- */
-static int zbud_show_unbuddied_list_counts(char *buf)
-{
- int i;
- char *p = buf;
-
- for (i = 0; i < NCHUNKS; i++)
- p += sprintf(p, "%u ", zbud_unbuddied[i].count);
- return p - buf;
-}
-
-static int zbud_show_cumul_chunk_counts(char *buf)
-{
- unsigned long i, chunks = 0, total_chunks = 0, sum_total_chunks = 0;
- unsigned long total_chunks_lte_21 = 0, total_chunks_lte_32 = 0;
- unsigned long total_chunks_lte_42 = 0;
- char *p = buf;
-
- for (i = 0; i < NCHUNKS; i++) {
- p += sprintf(p, "%lu ", zbud_cumul_chunk_counts[i]);
- chunks += zbud_cumul_chunk_counts[i];
- total_chunks += zbud_cumul_chunk_counts[i];
- sum_total_chunks += i * zbud_cumul_chunk_counts[i];
- if (i == 21)
- total_chunks_lte_21 = total_chunks;
- if (i == 32)
- total_chunks_lte_32 = total_chunks;
- if (i == 42)
- total_chunks_lte_42 = total_chunks;
- }
- p += sprintf(p, "<=21:%lu <=32:%lu <=42:%lu, mean:%lu\n",
- total_chunks_lte_21, total_chunks_lte_32, total_chunks_lte_42,
- chunks == 0 ? 0 : sum_total_chunks / chunks);
- return p - buf;
-}
-#endif
-
-/**********
- * This "zv" PAM implementation combines the TLSF-based xvMalloc
- * with lzo1x compression to maximize the amount of data that can
- * be packed into a physical page.
- *
- * Zv represents a PAM page with the index and object (plus a "size" value
- * necessary for decompression) immediately preceding the compressed data.
- */
-
-/* rudimentary policy limits */
-/* total number of persistent pages may not exceed this percentage */
-static unsigned int zv_page_count_policy_percent = 75;
-/*
- * byte count defining poor compression; pages with greater zsize will be
- * rejected
- */
-static unsigned int zv_max_zsize = (PAGE_SIZE / 8) * 7;
-/*
- * byte count defining poor *mean* compression; pages with greater zsize
- * will be rejected until sufficient better-compressed pages are accepted
- * driving the mean below this threshold
- */
-static unsigned int zv_max_mean_zsize = (PAGE_SIZE / 8) * 5;
-
-static atomic_t zv_curr_dist_counts[NCHUNKS];
-static atomic_t zv_cumul_dist_counts[NCHUNKS];
-
-
-static struct zv_hdr *zv_create(struct zcache_client *cli, uint32_t pool_id,
- struct tmem_oid *oid, uint32_t index,
- void *cdata, unsigned clen)
-{
- struct page *page;
- struct zv_hdr *zv = NULL;
- uint32_t offset;
- int alloc_size = clen + sizeof(struct zv_hdr);
- int chunks = (alloc_size + (CHUNK_SIZE - 1)) >> CHUNK_SHIFT;
- int ret;
-
- BUG_ON(!irqs_disabled());
- BUG_ON(chunks >= NCHUNKS);
- ret = xv_malloc(cli->xvpool, clen + sizeof(struct zv_hdr),
- &page, &offset, ZCACHE_GFP_MASK);
- if (unlikely(ret))
- goto out;
- atomic_inc(&zv_curr_dist_counts[chunks]);
- atomic_inc(&zv_cumul_dist_counts[chunks]);
- zv = kmap_atomic(page) + offset;
- zv->index = index;
- zv->oid = *oid;
- zv->pool_id = pool_id;
- SET_SENTINEL(zv, ZVH);
- INIT_LIST_HEAD(&zv->rem_op.list);
- zv->client_id = get_client_id_from_client(cli);
- zv->rem_op.op = RAMSTER_REMOTIFY_PERS_PUT;
- if (zv->client_id == LOCAL_CLIENT) {
- spin_lock(&zcache_rem_op_list_lock);
- list_add_tail(&zv->rem_op.list, &zcache_rem_op_list);
- spin_unlock(&zcache_rem_op_list_lock);
- }
- memcpy((char *)zv + sizeof(struct zv_hdr), cdata, clen);
- kunmap_atomic(zv);
-out:
- return zv;
-}
-
-/* similar to zv_create, but just reserve space, no data yet */
-static struct zv_hdr *zv_alloc(struct tmem_pool *pool,
- struct tmem_oid *oid, uint32_t index,
- unsigned clen)
-{
- struct zcache_client *cli = pool->client;
- struct page *page;
- struct zv_hdr *zv = NULL;
- uint32_t offset;
- int ret;
-
- BUG_ON(!irqs_disabled());
- BUG_ON(!is_local_client(pool->client));
- ret = xv_malloc(cli->xvpool, clen + sizeof(struct zv_hdr),
- &page, &offset, ZCACHE_GFP_MASK);
- if (unlikely(ret))
- goto out;
- zv = kmap_atomic(page) + offset;
- SET_SENTINEL(zv, ZVH);
- INIT_LIST_HEAD(&zv->rem_op.list);
- zv->client_id = LOCAL_CLIENT;
- zv->rem_op.op = RAMSTER_INTRANSIT_PERS;
- zv->index = index;
- zv->oid = *oid;
- zv->pool_id = pool->pool_id;
- kunmap_atomic(zv);
-out:
- return zv;
-}
-
-static void zv_free(struct xv_pool *xvpool, struct zv_hdr *zv)
-{
- unsigned long flags;
- struct page *page;
- uint32_t offset;
- uint16_t size = xv_get_object_size(zv);
- int chunks = (size + (CHUNK_SIZE - 1)) >> CHUNK_SHIFT;
-
- ASSERT_SENTINEL(zv, ZVH);
- BUG_ON(chunks >= NCHUNKS);
- atomic_dec(&zv_curr_dist_counts[chunks]);
- size -= sizeof(*zv);
- spin_lock(&zcache_rem_op_list_lock);
- size = xv_get_object_size(zv) - sizeof(*zv);
- BUG_ON(size == 0);
- INVERT_SENTINEL(zv, ZVH);
- if (!list_empty(&zv->rem_op.list))
- list_del_init(&zv->rem_op.list);
- spin_unlock(&zcache_rem_op_list_lock);
- page = virt_to_page(zv);
- offset = (unsigned long)zv & ~PAGE_MASK;
- local_irq_save(flags);
- xv_free(xvpool, page, offset);
- local_irq_restore(flags);
-}
-
-static void zv_decompress(struct page *page, struct zv_hdr *zv)
-{
- size_t clen = PAGE_SIZE;
- char *to_va;
- unsigned size;
- int ret;
-
- ASSERT_SENTINEL(zv, ZVH);
- size = xv_get_object_size(zv) - sizeof(*zv);
- BUG_ON(size == 0);
- to_va = kmap_atomic(page);
- ret = lzo1x_decompress_safe((char *)zv + sizeof(*zv),
- size, to_va, &clen);
- kunmap_atomic(to_va);
- BUG_ON(ret != LZO_E_OK);
- BUG_ON(clen != PAGE_SIZE);
-}
-
-static void zv_copy_from_pampd(char *data, size_t *bufsize, struct zv_hdr *zv)
-{
- unsigned size;
-
- ASSERT_SENTINEL(zv, ZVH);
- size = xv_get_object_size(zv) - sizeof(*zv);
- BUG_ON(size == 0 || size > zv_max_page_size);
- BUG_ON(size > *bufsize);
- memcpy(data, (char *)zv + sizeof(*zv), size);
- *bufsize = size;
-}
-
-static void zv_copy_to_pampd(struct zv_hdr *zv, char *data, size_t size)
-{
- unsigned zv_size;
-
- ASSERT_SENTINEL(zv, ZVH);
- zv_size = xv_get_object_size(zv) - sizeof(*zv);
- BUG_ON(zv_size != size);
- BUG_ON(zv_size == 0 || zv_size > zv_max_page_size);
- memcpy((char *)zv + sizeof(*zv), data, size);
-}
-
-#ifdef CONFIG_SYSFS
-/*
- * show a distribution of compression stats for zv pages.
- */
-
-static int zv_curr_dist_counts_show(char *buf)
-{
- unsigned long i, n, chunks = 0, sum_total_chunks = 0;
- char *p = buf;
-
- for (i = 0; i < NCHUNKS; i++) {
- n = atomic_read(&zv_curr_dist_counts[i]);
- p += sprintf(p, "%lu ", n);
- chunks += n;
- sum_total_chunks += i * n;
- }
- p += sprintf(p, "mean:%lu\n",
- chunks == 0 ? 0 : sum_total_chunks / chunks);
- return p - buf;
-}
-
-static int zv_cumul_dist_counts_show(char *buf)
-{
- unsigned long i, n, chunks = 0, sum_total_chunks = 0;
- char *p = buf;
-
- for (i = 0; i < NCHUNKS; i++) {
- n = atomic_read(&zv_cumul_dist_counts[i]);
- p += sprintf(p, "%lu ", n);
- chunks += n;
- sum_total_chunks += i * n;
- }
- p += sprintf(p, "mean:%lu\n",
- chunks == 0 ? 0 : sum_total_chunks / chunks);
- return p - buf;
-}
-
-/*
- * setting zv_max_zsize via sysfs causes all persistent (e.g. swap)
- * pages that don't compress to less than this value (including metadata
- * overhead) to be rejected. We don't allow the value to get too close
- * to PAGE_SIZE.
- */
-static ssize_t zv_max_zsize_show(struct kobject *kobj,
- struct kobj_attribute *attr,
- char *buf)
-{
- return sprintf(buf, "%u\n", zv_max_zsize);
-}
-
-static ssize_t zv_max_zsize_store(struct kobject *kobj,
- struct kobj_attribute *attr,
- const char *buf, size_t count)
-{
- unsigned long val;
- int err;
-
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
-
- err = kstrtoul(buf, 10, &val);
- if (err || (val == 0) || (val > (PAGE_SIZE / 8) * 7))
- return -EINVAL;
- zv_max_zsize = val;
- return count;
-}
-
-/*
- * setting zv_max_mean_zsize via sysfs causes all persistent (e.g. swap)
- * pages that don't compress to less than this value (including metadata
- * overhead) to be rejected UNLESS the mean compression is also smaller
- * than this value. In other words, we are load-balancing-by-zsize the
- * accepted pages. Again, we don't allow the value to get too close
- * to PAGE_SIZE.
- */
-static ssize_t zv_max_mean_zsize_show(struct kobject *kobj,
- struct kobj_attribute *attr,
- char *buf)
-{
- return sprintf(buf, "%u\n", zv_max_mean_zsize);
-}
-
-static ssize_t zv_max_mean_zsize_store(struct kobject *kobj,
- struct kobj_attribute *attr,
- const char *buf, size_t count)
-{
- unsigned long val;
- int err;
-
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
-
- err = kstrtoul(buf, 10, &val);
- if (err || (val == 0) || (val > (PAGE_SIZE / 8) * 7))
- return -EINVAL;
- zv_max_mean_zsize = val;
- return count;
-}
-
-/*
- * setting zv_page_count_policy_percent via sysfs sets an upper bound of
- * persistent (e.g. swap) pages that will be retained according to:
- * (zv_page_count_policy_percent * totalram_pages) / 100)
- * when that limit is reached, further puts will be rejected (until
- * some pages have been flushed). Note that, due to compression,
- * this number may exceed 100; it defaults to 75 and we set an
- * arbitrary limit of 150. A poor choice will almost certainly result
- * in OOM's, so this value should only be changed prudently.
- */
-static ssize_t zv_page_count_policy_percent_show(struct kobject *kobj,
- struct kobj_attribute *attr,
- char *buf)
-{
- return sprintf(buf, "%u\n", zv_page_count_policy_percent);
-}
-
-static ssize_t zv_page_count_policy_percent_store(struct kobject *kobj,
- struct kobj_attribute *attr,
- const char *buf, size_t count)
-{
- unsigned long val;
- int err;
-
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
-
- err = kstrtoul(buf, 10, &val);
- if (err || (val == 0) || (val > 150))
- return -EINVAL;
- zv_page_count_policy_percent = val;
- return count;
-}
-
-static struct kobj_attribute zcache_zv_max_zsize_attr = {
- .attr = { .name = "zv_max_zsize", .mode = 0644 },
- .show = zv_max_zsize_show,
- .store = zv_max_zsize_store,
-};
-
-static struct kobj_attribute zcache_zv_max_mean_zsize_attr = {
- .attr = { .name = "zv_max_mean_zsize", .mode = 0644 },
- .show = zv_max_mean_zsize_show,
- .store = zv_max_mean_zsize_store,
-};
-
-static struct kobj_attribute zcache_zv_page_count_policy_percent_attr = {
- .attr = { .name = "zv_page_count_policy_percent",
- .mode = 0644 },
- .show = zv_page_count_policy_percent_show,
- .store = zv_page_count_policy_percent_store,
-};
-#endif
-
-/*
- * zcache core code starts here
- */
-
-/* useful stats not collected by cleancache or frontswap */
-static unsigned long zcache_flush_total;
-static unsigned long zcache_flush_found;
-static unsigned long zcache_flobj_total;
-static unsigned long zcache_flobj_found;
-static unsigned long zcache_failed_eph_puts;
-static unsigned long zcache_nonactive_puts;
-static unsigned long zcache_failed_pers_puts;
-
-/*
- * Tmem operations assume the poolid implies the invoking client.
- * Zcache only has one client (the kernel itself): LOCAL_CLIENT.
- * RAMster has each client numbered by cluster node, and a KVM version
- * of zcache would have one client per guest and each client might
- * have a poolid==N.
- */
-static struct tmem_pool *zcache_get_pool_by_id(uint16_t cli_id, uint16_t poolid)
-{
- struct tmem_pool *pool = NULL;
- struct zcache_client *cli = NULL;
-
- if (cli_id == LOCAL_CLIENT)
- cli = &zcache_host;
- else {
- if (cli_id >= MAX_CLIENTS)
- goto out;
- cli = &zcache_clients[cli_id];
- if (cli == NULL)
- goto out;
- atomic_inc(&cli->refcount);
- }
- if (poolid < MAX_POOLS_PER_CLIENT) {
- pool = cli->tmem_pools[poolid];
- if (pool != NULL)
- atomic_inc(&pool->refcount);
- }
-out:
- return pool;
-}
-
-static void zcache_put_pool(struct tmem_pool *pool)
-{
- struct zcache_client *cli = NULL;
-
- if (pool == NULL)
- BUG();
- cli = pool->client;
- atomic_dec(&pool->refcount);
- atomic_dec(&cli->refcount);
-}
-
-int zcache_new_client(uint16_t cli_id)
-{
- struct zcache_client *cli = NULL;
- int ret = -1;
-
- if (cli_id == LOCAL_CLIENT)
- cli = &zcache_host;
- else if ((unsigned int)cli_id < MAX_CLIENTS)
- cli = &zcache_clients[cli_id];
- if (cli == NULL)
- goto out;
- if (cli->allocated)
- goto out;
- cli->allocated = 1;
-#ifdef CONFIG_FRONTSWAP
- cli->xvpool = xv_create_pool();
- if (cli->xvpool == NULL)
- goto out;
-#endif
- ret = 0;
-out:
- return ret;
-}
-
-/* counters for debugging */
-static unsigned long zcache_failed_get_free_pages;
-static unsigned long zcache_failed_alloc;
-static unsigned long zcache_put_to_flush;
-
-/*
- * for now, used named slabs so can easily track usage; later can
- * either just use kmalloc, or perhaps add a slab-like allocator
- * to more carefully manage total memory utilization
- */
-static struct kmem_cache *zcache_objnode_cache;
-static struct kmem_cache *zcache_obj_cache;
-static struct kmem_cache *ramster_flnode_cache;
-static atomic_t zcache_curr_obj_count = ATOMIC_INIT(0);
-static unsigned long zcache_curr_obj_count_max;
-static atomic_t zcache_curr_objnode_count = ATOMIC_INIT(0);
-static unsigned long zcache_curr_objnode_count_max;
-
-/*
- * to avoid memory allocation recursion (e.g. due to direct reclaim), we
- * preload all necessary data structures so the hostops callbacks never
- * actually do a malloc
- */
-struct zcache_preload {
- void *page;
- struct tmem_obj *obj;
- int nr;
- struct tmem_objnode *objnodes[OBJNODE_TREE_MAX_PATH];
- struct flushlist_node *flnode;
-};
-static DEFINE_PER_CPU(struct zcache_preload, zcache_preloads) = { 0, };
-
-static int zcache_do_preload(struct tmem_pool *pool)
-{
- struct zcache_preload *kp;
- struct tmem_objnode *objnode;
- struct tmem_obj *obj;
- struct flushlist_node *flnode;
- void *page;
- int ret = -ENOMEM;
-
- if (unlikely(zcache_objnode_cache == NULL))
- goto out;
- if (unlikely(zcache_obj_cache == NULL))
- goto out;
- preempt_disable();
- kp = &__get_cpu_var(zcache_preloads);
- while (kp->nr < ARRAY_SIZE(kp->objnodes)) {
- preempt_enable_no_resched();
- objnode = kmem_cache_alloc(zcache_objnode_cache,
- ZCACHE_GFP_MASK);
- if (unlikely(objnode == NULL)) {
- zcache_failed_alloc++;
- goto out;
- }
- preempt_disable();
- kp = &__get_cpu_var(zcache_preloads);
- if (kp->nr < ARRAY_SIZE(kp->objnodes))
- kp->objnodes[kp->nr++] = objnode;
- else
- kmem_cache_free(zcache_objnode_cache, objnode);
- }
- preempt_enable_no_resched();
- obj = kmem_cache_alloc(zcache_obj_cache, ZCACHE_GFP_MASK);
- if (unlikely(obj == NULL)) {
- zcache_failed_alloc++;
- goto out;
- }
- flnode = kmem_cache_alloc(ramster_flnode_cache, ZCACHE_GFP_MASK);
- if (unlikely(flnode == NULL)) {
- zcache_failed_alloc++;
- goto out;
- }
- if (is_ephemeral(pool)) {
- page = (void *)__get_free_page(ZCACHE_GFP_MASK);
- if (unlikely(page == NULL)) {
- zcache_failed_get_free_pages++;
- kmem_cache_free(zcache_obj_cache, obj);
- kmem_cache_free(ramster_flnode_cache, flnode);
- goto out;
- }
- }
- preempt_disable();
- kp = &__get_cpu_var(zcache_preloads);
- if (kp->obj == NULL)
- kp->obj = obj;
- else
- kmem_cache_free(zcache_obj_cache, obj);
- if (kp->flnode == NULL)
- kp->flnode = flnode;
- else
- kmem_cache_free(ramster_flnode_cache, flnode);
- if (is_ephemeral(pool)) {
- if (kp->page == NULL)
- kp->page = page;
- else
- free_page((unsigned long)page);
- }
- ret = 0;
-out:
- return ret;
-}
-
-static int ramster_do_preload_flnode_only(struct tmem_pool *pool)
-{
- struct zcache_preload *kp;
- struct flushlist_node *flnode;
- int ret = -ENOMEM;
-
- BUG_ON(!irqs_disabled());
- if (unlikely(ramster_flnode_cache == NULL))
- BUG();
- kp = &__get_cpu_var(zcache_preloads);
- flnode = kmem_cache_alloc(ramster_flnode_cache, GFP_ATOMIC);
- if (unlikely(flnode == NULL) && kp->flnode == NULL)
- BUG(); /* FIXME handle more gracefully, but how??? */
- else if (kp->flnode == NULL)
- kp->flnode = flnode;
- else
- kmem_cache_free(ramster_flnode_cache, flnode);
- return ret;
-}
-
-static void *zcache_get_free_page(void)
-{
- struct zcache_preload *kp;
- void *page;
-
- kp = &__get_cpu_var(zcache_preloads);
- page = kp->page;
- BUG_ON(page == NULL);
- kp->page = NULL;
- return page;
-}
-
-static void zcache_free_page(void *p)
-{
- free_page((unsigned long)p);
-}
-
-/*
- * zcache implementation for tmem host ops
- */
-
-static struct tmem_objnode *zcache_objnode_alloc(struct tmem_pool *pool)
-{
- struct tmem_objnode *objnode = NULL;
- unsigned long count;
- struct zcache_preload *kp;
-
- kp = &__get_cpu_var(zcache_preloads);
- if (kp->nr <= 0)
- goto out;
- objnode = kp->objnodes[kp->nr - 1];
- BUG_ON(objnode == NULL);
- kp->objnodes[kp->nr - 1] = NULL;
- kp->nr--;
- count = atomic_inc_return(&zcache_curr_objnode_count);
- if (count > zcache_curr_objnode_count_max)
- zcache_curr_objnode_count_max = count;
-out:
- return objnode;
-}
-
-static void zcache_objnode_free(struct tmem_objnode *objnode,
- struct tmem_pool *pool)
-{
- atomic_dec(&zcache_curr_objnode_count);
- BUG_ON(atomic_read(&zcache_curr_objnode_count) < 0);
- kmem_cache_free(zcache_objnode_cache, objnode);
-}
-
-static struct tmem_obj *zcache_obj_alloc(struct tmem_pool *pool)
-{
- struct tmem_obj *obj = NULL;
- unsigned long count;
- struct zcache_preload *kp;
-
- kp = &__get_cpu_var(zcache_preloads);
- obj = kp->obj;
- BUG_ON(obj == NULL);
- kp->obj = NULL;
- count = atomic_inc_return(&zcache_curr_obj_count);
- if (count > zcache_curr_obj_count_max)
- zcache_curr_obj_count_max = count;
- return obj;
-}
-
-static void zcache_obj_free(struct tmem_obj *obj, struct tmem_pool *pool)
-{
- atomic_dec(&zcache_curr_obj_count);
- BUG_ON(atomic_read(&zcache_curr_obj_count) < 0);
- kmem_cache_free(zcache_obj_cache, obj);
-}
-
-static struct flushlist_node *ramster_flnode_alloc(struct tmem_pool *pool)
-{
- struct flushlist_node *flnode = NULL;
- struct zcache_preload *kp;
- int count;
-
- kp = &__get_cpu_var(zcache_preloads);
- flnode = kp->flnode;
- BUG_ON(flnode == NULL);
- kp->flnode = NULL;
- count = atomic_inc_return(&ramster_curr_flnode_count);
- if (count > ramster_curr_flnode_count_max)
- ramster_curr_flnode_count_max = count;
- return flnode;
-}
-
-static void ramster_flnode_free(struct flushlist_node *flnode,
- struct tmem_pool *pool)
-{
- atomic_dec(&ramster_curr_flnode_count);
- BUG_ON(atomic_read(&ramster_curr_flnode_count) < 0);
- kmem_cache_free(ramster_flnode_cache, flnode);
-}
-
-static struct tmem_hostops zcache_hostops = {
- .obj_alloc = zcache_obj_alloc,
- .obj_free = zcache_obj_free,
- .objnode_alloc = zcache_objnode_alloc,
- .objnode_free = zcache_objnode_free,
-};
-
-/*
- * zcache implementations for PAM page descriptor ops
- */
-
-
-static inline void dec_and_check(atomic_t *pvar)
-{
- atomic_dec(pvar);
- /* later when all accounting is fixed, make this a BUG */
- WARN_ON_ONCE(atomic_read(pvar) < 0);
-}
-
-static atomic_t zcache_curr_eph_pampd_count = ATOMIC_INIT(0);
-static unsigned long zcache_curr_eph_pampd_count_max;
-static atomic_t zcache_curr_pers_pampd_count = ATOMIC_INIT(0);
-static unsigned long zcache_curr_pers_pampd_count_max;
-
-/* forward reference */
-static int zcache_compress(struct page *from, void **out_va, size_t *out_len);
-
-static int zcache_pampd_eph_create(char *data, size_t size, bool raw,
- struct tmem_pool *pool, struct tmem_oid *oid,
- uint32_t index, void **pampd)
-{
- int ret = -1;
- void *cdata = data;
- size_t clen = size;
- struct zcache_client *cli = pool->client;
- uint16_t client_id = get_client_id_from_client(cli);
- struct page *page = NULL;
- unsigned long count;
-
- if (!raw) {
- page = virt_to_page(data);
- ret = zcache_compress(page, &cdata, &clen);
- if (ret == 0)
- goto out;
- if (clen == 0 || clen > zbud_max_buddy_size()) {
- zcache_compress_poor++;
- goto out;
- }
- }
- *pampd = (void *)zbud_create(client_id, pool->pool_id, oid,
- index, page, cdata, clen);
- if (*pampd == NULL) {
- ret = -ENOMEM;
- goto out;
- }
- ret = 0;
- count = atomic_inc_return(&zcache_curr_eph_pampd_count);
- if (count > zcache_curr_eph_pampd_count_max)
- zcache_curr_eph_pampd_count_max = count;
- if (client_id != LOCAL_CLIENT) {
- count = atomic_inc_return(&ramster_foreign_eph_pampd_count);
- if (count > ramster_foreign_eph_pampd_count_max)
- ramster_foreign_eph_pampd_count_max = count;
- }
-out:
- return ret;
-}
-
-static int zcache_pampd_pers_create(char *data, size_t size, bool raw,
- struct tmem_pool *pool, struct tmem_oid *oid,
- uint32_t index, void **pampd)
-{
- int ret = -1;
- void *cdata = data;
- size_t clen = size;
- struct zcache_client *cli = pool->client;
- struct page *page;
- unsigned long count;
- unsigned long zv_mean_zsize;
- struct zv_hdr *zv;
- long curr_pers_pampd_count;
- u64 total_zsize;
-#ifdef RAMSTER_TESTING
- static bool pampd_neg_warned;
-#endif
-
- curr_pers_pampd_count = atomic_read(&zcache_curr_pers_pampd_count) -
- atomic_read(&ramster_remote_pers_pages);
-#ifdef RAMSTER_TESTING
- /* should always be positive, but warn if accounting is off */
- if (!pampd_neg_warned) {
- pr_warn("ramster: bad accounting for curr_pers_pampd_count\n");
- pampd_neg_warned = true;
- }
-#endif
- if (curr_pers_pampd_count >
- (zv_page_count_policy_percent * totalram_pages) / 100) {
- zcache_policy_percent_exceeded++;
- goto out;
- }
- if (raw)
- goto ok_to_create;
- page = virt_to_page(data);
- if (zcache_compress(page, &cdata, &clen) == 0)
- goto out;
- /* reject if compression is too poor */
- if (clen > zv_max_zsize) {
- zcache_compress_poor++;
- goto out;
- }
- /* reject if mean compression is too poor */
- if ((clen > zv_max_mean_zsize) && (curr_pers_pampd_count > 0)) {
- total_zsize = xv_get_total_size_bytes(cli->xvpool);
- zv_mean_zsize = div_u64(total_zsize, curr_pers_pampd_count);
- if (zv_mean_zsize > zv_max_mean_zsize) {
- zcache_mean_compress_poor++;
- goto out;
- }
- }
-ok_to_create:
- *pampd = (void *)zv_create(cli, pool->pool_id, oid, index, cdata, clen);
- if (*pampd == NULL) {
- ret = -ENOMEM;
- goto out;
- }
- ret = 0;
- count = atomic_inc_return(&zcache_curr_pers_pampd_count);
- if (count > zcache_curr_pers_pampd_count_max)
- zcache_curr_pers_pampd_count_max = count;
- if (is_local_client(cli))
- goto out;
- zv = *(struct zv_hdr **)pampd;
- count = atomic_inc_return(&ramster_foreign_pers_pampd_count);
- if (count > ramster_foreign_pers_pampd_count_max)
- ramster_foreign_pers_pampd_count_max = count;
-out:
- return ret;
-}
-
-static void *zcache_pampd_create(char *data, size_t size, bool raw, int eph,
- struct tmem_pool *pool, struct tmem_oid *oid,
- uint32_t index)
-{
- void *pampd = NULL;
- int ret;
- bool ephemeral;
-
- BUG_ON(preemptible());
- ephemeral = (eph == 1) || ((eph == 0) && is_ephemeral(pool));
- if (ephemeral)
- ret = zcache_pampd_eph_create(data, size, raw, pool,
- oid, index, &pampd);
- else
- ret = zcache_pampd_pers_create(data, size, raw, pool,
- oid, index, &pampd);
- /* FIXME add some counters here for failed creates? */
- return pampd;
-}
-
-/*
- * fill the pageframe corresponding to the struct page with the data
- * from the passed pampd
- */
-static int zcache_pampd_get_data(char *data, size_t *bufsize, bool raw,
- void *pampd, struct tmem_pool *pool,
- struct tmem_oid *oid, uint32_t index)
-{
- int ret = 0;
-
- BUG_ON(preemptible());
- BUG_ON(is_ephemeral(pool)); /* Fix later for shared pools? */
- BUG_ON(pampd_is_remote(pampd));
- if (raw)
- zv_copy_from_pampd(data, bufsize, pampd);
- else
- zv_decompress(virt_to_page(data), pampd);
- return ret;
-}
-
-static int zcache_pampd_get_data_and_free(char *data, size_t *bufsize, bool raw,
- void *pampd, struct tmem_pool *pool,
- struct tmem_oid *oid, uint32_t index)
-{
- int ret = 0;
- unsigned long flags;
- struct zcache_client *cli = pool->client;
-
- BUG_ON(preemptible());
- BUG_ON(pampd_is_remote(pampd));
- if (is_ephemeral(pool)) {
- local_irq_save(flags);
- if (raw)
- zbud_copy_from_pampd(data, bufsize, pampd);
- else
- ret = zbud_decompress(virt_to_page(data), pampd);
- zbud_free_and_delist((struct zbud_hdr *)pampd);
- local_irq_restore(flags);
- if (!is_local_client(cli))
- dec_and_check(&ramster_foreign_eph_pampd_count);
- dec_and_check(&zcache_curr_eph_pampd_count);
- } else {
- if (is_local_client(cli))
- BUG();
- if (raw)
- zv_copy_from_pampd(data, bufsize, pampd);
- else
- zv_decompress(virt_to_page(data), pampd);
- zv_free(cli->xvpool, pampd);
- if (!is_local_client(cli))
- dec_and_check(&ramster_foreign_pers_pampd_count);
- dec_and_check(&zcache_curr_pers_pampd_count);
- ret = 0;
- }
- return ret;
-}
-
-static bool zcache_pampd_is_remote(void *pampd)
-{
- return pampd_is_remote(pampd);
-}
-
-/*
- * free the pampd and remove it from any zcache lists
- * pampd must no longer be pointed to from any tmem data structures!
- */
-static void zcache_pampd_free(void *pampd, struct tmem_pool *pool,
- struct tmem_oid *oid, uint32_t index, bool acct)
-{
- struct zcache_client *cli = pool->client;
- bool eph = is_ephemeral(pool);
- struct zv_hdr *zv;
-
- BUG_ON(preemptible());
- if (pampd_is_remote(pampd)) {
- WARN_ON(acct == false);
- if (oid == NULL) {
- /*
- * a NULL oid means to ignore this pampd free
- * as the remote freeing will be handled elsewhere
- */
- } else if (eph) {
- /* FIXME remote flush optional but probably good idea */
- /* FIXME get these working properly again */
- dec_and_check(&zcache_curr_eph_pampd_count);
- } else if (pampd_is_intransit(pampd)) {
- /* did a pers remote get_and_free, so just free local */
- pampd = pampd_mask_intransit_and_remote(pampd);
- goto local_pers;
- } else {
- struct flushlist_node *flnode =
- ramster_flnode_alloc(pool);
-
- flnode->xh.client_id = pampd_remote_node(pampd);
- flnode->xh.pool_id = pool->pool_id;
- flnode->xh.oid = *oid;
- flnode->xh.index = index;
- flnode->rem_op.op = RAMSTER_REMOTIFY_FLUSH_PAGE;
- spin_lock(&zcache_rem_op_list_lock);
- list_add(&flnode->rem_op.list, &zcache_rem_op_list);
- spin_unlock(&zcache_rem_op_list_lock);
- dec_and_check(&zcache_curr_pers_pampd_count);
- dec_and_check(&ramster_remote_pers_pages);
- }
- } else if (eph) {
- zbud_free_and_delist((struct zbud_hdr *)pampd);
- if (!is_local_client(pool->client))
- dec_and_check(&ramster_foreign_eph_pampd_count);
- if (acct)
- /* FIXME get these working properly again */
- dec_and_check(&zcache_curr_eph_pampd_count);
- } else {
-local_pers:
- zv = (struct zv_hdr *)pampd;
- if (!is_local_client(pool->client))
- dec_and_check(&ramster_foreign_pers_pampd_count);
- zv_free(cli->xvpool, zv);
- if (acct)
- /* FIXME get these working properly again */
- dec_and_check(&zcache_curr_pers_pampd_count);
- }
-}
-
-static void zcache_pampd_free_obj(struct tmem_pool *pool,
- struct tmem_obj *obj)
-{
- struct flushlist_node *flnode;
-
- BUG_ON(preemptible());
- if (obj->extra == NULL)
- return;
- BUG_ON(!pampd_is_remote(obj->extra));
- flnode = ramster_flnode_alloc(pool);
- flnode->xh.client_id = pampd_remote_node(obj->extra);
- flnode->xh.pool_id = pool->pool_id;
- flnode->xh.oid = obj->oid;
- flnode->xh.index = FLUSH_ENTIRE_OBJECT;
- flnode->rem_op.op = RAMSTER_REMOTIFY_FLUSH_OBJ;
- spin_lock(&zcache_rem_op_list_lock);
- list_add(&flnode->rem_op.list, &zcache_rem_op_list);
- spin_unlock(&zcache_rem_op_list_lock);
-}
-
-void zcache_pampd_new_obj(struct tmem_obj *obj)
-{
- obj->extra = NULL;
-}
-
-int zcache_pampd_replace_in_obj(void *new_pampd, struct tmem_obj *obj)
-{
- int ret = -1;
-
- if (new_pampd != NULL) {
- if (obj->extra == NULL)
- obj->extra = new_pampd;
- /* enforce that all remote pages in an object reside
- * in the same node! */
- else if (pampd_remote_node(new_pampd) !=
- pampd_remote_node((void *)(obj->extra)))
- BUG();
- ret = 0;
- }
- return ret;
-}
-
-/*
- * Called by the message handler after a (still compressed) page has been
- * fetched from the remote machine in response to an "is_remote" tmem_get
- * or persistent tmem_localify. For a tmem_get, "extra" is the address of
- * the page that is to be filled to successfully resolve the tmem_get; for
- * a (persistent) tmem_localify, "extra" is NULL (as the data is placed only
- * in the local zcache). "data" points to "size" bytes of (compressed) data
- * passed in the message. In the case of a persistent remote get, if
- * pre-allocation was successful (see zcache_repatriate_preload), the page
- * is placed into both local zcache and at "extra".
- */
-int zcache_localify(int pool_id, struct tmem_oid *oidp,
- uint32_t index, char *data, size_t size,
- void *extra)
-{
- int ret = -ENOENT;
- unsigned long flags;
- struct tmem_pool *pool;
- bool ephemeral, delete = false;
- size_t clen = PAGE_SIZE;
- void *pampd, *saved_hb;
- struct tmem_obj *obj;
-
- pool = zcache_get_pool_by_id(LOCAL_CLIENT, pool_id);
- if (unlikely(pool == NULL))
- /* pool doesn't exist anymore */
- goto out;
- ephemeral = is_ephemeral(pool);
- local_irq_save(flags); /* FIXME: maybe only disable softirqs? */
- pampd = tmem_localify_get_pampd(pool, oidp, index, &obj, &saved_hb);
- if (pampd == NULL) {
- /* hmmm... must have been a flush while waiting */
-#ifdef RAMSTER_TESTING
- pr_err("UNTESTED pampd==NULL in zcache_localify\n");
-#endif
- if (ephemeral)
- ramster_remote_eph_pages_unsucc_get++;
- else
- ramster_remote_pers_pages_unsucc_get++;
- obj = NULL;
- goto finish;
- } else if (unlikely(!pampd_is_remote(pampd))) {
- /* hmmm... must have been a dup put while waiting */
-#ifdef RAMSTER_TESTING
- pr_err("UNTESTED dup while waiting in zcache_localify\n");
-#endif
- if (ephemeral)
- ramster_remote_eph_pages_unsucc_get++;
- else
- ramster_remote_pers_pages_unsucc_get++;
- obj = NULL;
- pampd = NULL;
- ret = -EEXIST;
- goto finish;
- } else if (size == 0) {
- /* no remote data, delete the local is_remote pampd */
- pampd = NULL;
- if (ephemeral)
- ramster_remote_eph_pages_unsucc_get++;
- else
- BUG();
- delete = true;
- goto finish;
- }
- if (!ephemeral && pampd_is_intransit(pampd)) {
- /* localify to zcache */
- pampd = pampd_mask_intransit_and_remote(pampd);
- zv_copy_to_pampd(pampd, data, size);
- } else {
- pampd = NULL;
- obj = NULL;
- }
- if (extra != NULL) {
- /* decompress direct-to-memory to complete remotify */
- ret = lzo1x_decompress_safe((char *)data, size,
- (char *)extra, &clen);
- BUG_ON(ret != LZO_E_OK);
- BUG_ON(clen != PAGE_SIZE);
- }
- if (ephemeral)
- ramster_remote_eph_pages_succ_get++;
- else
- ramster_remote_pers_pages_succ_get++;
- ret = 0;
-finish:
- tmem_localify_finish(obj, index, pampd, saved_hb, delete);
- zcache_put_pool(pool);
- local_irq_restore(flags);
-out:
- return ret;
-}
-
-/*
- * Called on a remote persistent tmem_get to attempt to preallocate
- * local storage for the data contained in the remote persistent page.
- * If successfully preallocated, returns the pampd, marked as remote and
- * in_transit. Else returns NULL. Note that the appropriate tmem data
- * structure must be locked.
- */
-static void *zcache_pampd_repatriate_preload(void *pampd,
- struct tmem_pool *pool,
- struct tmem_oid *oid,
- uint32_t index,
- bool *intransit)
-{
- int clen = pampd_remote_size(pampd);
- void *ret_pampd = NULL;
- unsigned long flags;
-
- if (!pampd_is_remote(pampd))
- BUG();
- if (is_ephemeral(pool))
- BUG();
- if (pampd_is_intransit(pampd)) {
- /*
- * to avoid multiple allocations (and maybe a memory leak)
- * don't preallocate if already in the process of being
- * repatriated
- */
- *intransit = true;
- goto out;
- }
- *intransit = false;
- local_irq_save(flags);
- ret_pampd = (void *)zv_alloc(pool, oid, index, clen);
- if (ret_pampd != NULL) {
- /*
- * a pampd is marked intransit if it is remote and space has
- * been allocated for it locally (note, only happens for
- * persistent pages, in which case the remote copy is freed)
- */
- ret_pampd = pampd_mark_intransit(ret_pampd);
- dec_and_check(&ramster_remote_pers_pages);
- } else
- ramster_pers_pages_remote_nomem++;
- local_irq_restore(flags);
-out:
- return ret_pampd;
-}
-
-/*
- * Called on a remote tmem_get to invoke a message to fetch the page.
- * Might sleep so no tmem locks can be held. "extra" is passed
- * all the way through the round-trip messaging to zcache_localify.
- */
-static int zcache_pampd_repatriate(void *fake_pampd, void *real_pampd,
- struct tmem_pool *pool,
- struct tmem_oid *oid, uint32_t index,
- bool free, void *extra)
-{
- struct tmem_xhandle xh;
- int ret;
-
- if (pampd_is_intransit(real_pampd))
- /* have local space pre-reserved, so free remote copy */
- free = true;
- xh = tmem_xhandle_fill(LOCAL_CLIENT, pool, oid, index);
- /* unreliable request/response for now */
- ret = ramster_remote_async_get(&xh, free,
- pampd_remote_node(fake_pampd),
- pampd_remote_size(fake_pampd),
- pampd_remote_cksum(fake_pampd),
- extra);
-#ifdef RAMSTER_TESTING
- if (ret != 0 && ret != -ENOENT)
- pr_err("TESTING zcache_pampd_repatriate returns, ret=%d\n",
- ret);
-#endif
- return ret;
-}
-
-static struct tmem_pamops zcache_pamops = {
- .create = zcache_pampd_create,
- .get_data = zcache_pampd_get_data,
- .free = zcache_pampd_free,
- .get_data_and_free = zcache_pampd_get_data_and_free,
- .free_obj = zcache_pampd_free_obj,
- .is_remote = zcache_pampd_is_remote,
- .repatriate_preload = zcache_pampd_repatriate_preload,
- .repatriate = zcache_pampd_repatriate,
- .new_obj = zcache_pampd_new_obj,
- .replace_in_obj = zcache_pampd_replace_in_obj,
-};
-
-/*
- * zcache compression/decompression and related per-cpu stuff
- */
-
-#define LZO_WORKMEM_BYTES LZO1X_1_MEM_COMPRESS
-#define LZO_DSTMEM_PAGE_ORDER 1
-static DEFINE_PER_CPU(unsigned char *, zcache_workmem);
-static DEFINE_PER_CPU(unsigned char *, zcache_dstmem);
-
-static int zcache_compress(struct page *from, void **out_va, size_t *out_len)
-{
- int ret = 0;
- unsigned char *dmem = __get_cpu_var(zcache_dstmem);
- unsigned char *wmem = __get_cpu_var(zcache_workmem);
- char *from_va;
-
- BUG_ON(!irqs_disabled());
- if (unlikely(dmem == NULL || wmem == NULL))
- goto out; /* no buffer, so can't compress */
- from_va = kmap_atomic(from);
- mb();
- ret = lzo1x_1_compress(from_va, PAGE_SIZE, dmem, out_len, wmem);
- BUG_ON(ret != LZO_E_OK);
- *out_va = dmem;
- kunmap_atomic(from_va);
- ret = 1;
-out:
- return ret;
-}
-
-
-static int zcache_cpu_notifier(struct notifier_block *nb,
- unsigned long action, void *pcpu)
-{
- int cpu = (long)pcpu;
- struct zcache_preload *kp;
-
- switch (action) {
- case CPU_UP_PREPARE:
- per_cpu(zcache_dstmem, cpu) = (void *)__get_free_pages(
- GFP_KERNEL | __GFP_REPEAT,
- LZO_DSTMEM_PAGE_ORDER),
- per_cpu(zcache_workmem, cpu) =
- kzalloc(LZO1X_MEM_COMPRESS,
- GFP_KERNEL | __GFP_REPEAT);
- per_cpu(zcache_remoteputmem, cpu) =
- kzalloc(PAGE_SIZE, GFP_KERNEL | __GFP_REPEAT);
- break;
- case CPU_DEAD:
- case CPU_UP_CANCELED:
- kfree(per_cpu(zcache_remoteputmem, cpu));
- per_cpu(zcache_remoteputmem, cpu) = NULL;
- free_pages((unsigned long)per_cpu(zcache_dstmem, cpu),
- LZO_DSTMEM_PAGE_ORDER);
- per_cpu(zcache_dstmem, cpu) = NULL;
- kfree(per_cpu(zcache_workmem, cpu));
- per_cpu(zcache_workmem, cpu) = NULL;
- kp = &per_cpu(zcache_preloads, cpu);
- while (kp->nr) {
- kmem_cache_free(zcache_objnode_cache,
- kp->objnodes[kp->nr - 1]);
- kp->objnodes[kp->nr - 1] = NULL;
- kp->nr--;
- }
- if (kp->obj) {
- kmem_cache_free(zcache_obj_cache, kp->obj);
- kp->obj = NULL;
- }
- if (kp->flnode) {
- kmem_cache_free(ramster_flnode_cache, kp->flnode);
- kp->flnode = NULL;
- }
- if (kp->page) {
- free_page((unsigned long)kp->page);
- kp->page = NULL;
- }
- break;
- default:
- break;
- }
- return NOTIFY_OK;
-}
-
-static struct notifier_block zcache_cpu_notifier_block = {
- .notifier_call = zcache_cpu_notifier
-};
-
-#ifdef CONFIG_SYSFS
-#define ZCACHE_SYSFS_RO(_name) \
- static ssize_t zcache_##_name##_show(struct kobject *kobj, \
- struct kobj_attribute *attr, char *buf) \
- { \
- return sprintf(buf, "%lu\n", zcache_##_name); \
- } \
- static struct kobj_attribute zcache_##_name##_attr = { \
- .attr = { .name = __stringify(_name), .mode = 0444 }, \
- .show = zcache_##_name##_show, \
- }
-
-#define ZCACHE_SYSFS_RO_ATOMIC(_name) \
- static ssize_t zcache_##_name##_show(struct kobject *kobj, \
- struct kobj_attribute *attr, char *buf) \
- { \
- return sprintf(buf, "%d\n", atomic_read(&zcache_##_name)); \
- } \
- static struct kobj_attribute zcache_##_name##_attr = { \
- .attr = { .name = __stringify(_name), .mode = 0444 }, \
- .show = zcache_##_name##_show, \
- }
-
-#define ZCACHE_SYSFS_RO_CUSTOM(_name, _func) \
- static ssize_t zcache_##_name##_show(struct kobject *kobj, \
- struct kobj_attribute *attr, char *buf) \
- { \
- return _func(buf); \
- } \
- static struct kobj_attribute zcache_##_name##_attr = { \
- .attr = { .name = __stringify(_name), .mode = 0444 }, \
- .show = zcache_##_name##_show, \
- }
-
-ZCACHE_SYSFS_RO(curr_obj_count_max);
-ZCACHE_SYSFS_RO(curr_objnode_count_max);
-ZCACHE_SYSFS_RO(flush_total);
-ZCACHE_SYSFS_RO(flush_found);
-ZCACHE_SYSFS_RO(flobj_total);
-ZCACHE_SYSFS_RO(flobj_found);
-ZCACHE_SYSFS_RO(failed_eph_puts);
-ZCACHE_SYSFS_RO(nonactive_puts);
-ZCACHE_SYSFS_RO(failed_pers_puts);
-ZCACHE_SYSFS_RO(zbud_curr_zbytes);
-ZCACHE_SYSFS_RO(zbud_cumul_zpages);
-ZCACHE_SYSFS_RO(zbud_cumul_zbytes);
-ZCACHE_SYSFS_RO(zbud_buddied_count);
-ZCACHE_SYSFS_RO(evicted_raw_pages);
-ZCACHE_SYSFS_RO(evicted_unbuddied_pages);
-ZCACHE_SYSFS_RO(evicted_buddied_pages);
-ZCACHE_SYSFS_RO(failed_get_free_pages);
-ZCACHE_SYSFS_RO(failed_alloc);
-ZCACHE_SYSFS_RO(put_to_flush);
-ZCACHE_SYSFS_RO(compress_poor);
-ZCACHE_SYSFS_RO(mean_compress_poor);
-ZCACHE_SYSFS_RO(policy_percent_exceeded);
-ZCACHE_SYSFS_RO_ATOMIC(zbud_curr_raw_pages);
-ZCACHE_SYSFS_RO_ATOMIC(zbud_curr_zpages);
-ZCACHE_SYSFS_RO_ATOMIC(curr_obj_count);
-ZCACHE_SYSFS_RO_ATOMIC(curr_objnode_count);
-ZCACHE_SYSFS_RO_CUSTOM(zbud_unbuddied_list_counts,
- zbud_show_unbuddied_list_counts);
-ZCACHE_SYSFS_RO_CUSTOM(zbud_cumul_chunk_counts,
- zbud_show_cumul_chunk_counts);
-ZCACHE_SYSFS_RO_CUSTOM(zv_curr_dist_counts,
- zv_curr_dist_counts_show);
-ZCACHE_SYSFS_RO_CUSTOM(zv_cumul_dist_counts,
- zv_cumul_dist_counts_show);
-
-static struct attribute *zcache_attrs[] = {
- &zcache_curr_obj_count_attr.attr,
- &zcache_curr_obj_count_max_attr.attr,
- &zcache_curr_objnode_count_attr.attr,
- &zcache_curr_objnode_count_max_attr.attr,
- &zcache_flush_total_attr.attr,
- &zcache_flobj_total_attr.attr,
- &zcache_flush_found_attr.attr,
- &zcache_flobj_found_attr.attr,
- &zcache_failed_eph_puts_attr.attr,
- &zcache_nonactive_puts_attr.attr,
- &zcache_failed_pers_puts_attr.attr,
- &zcache_policy_percent_exceeded_attr.attr,
- &zcache_compress_poor_attr.attr,
- &zcache_mean_compress_poor_attr.attr,
- &zcache_zbud_curr_raw_pages_attr.attr,
- &zcache_zbud_curr_zpages_attr.attr,
- &zcache_zbud_curr_zbytes_attr.attr,
- &zcache_zbud_cumul_zpages_attr.attr,
- &zcache_zbud_cumul_zbytes_attr.attr,
- &zcache_zbud_buddied_count_attr.attr,
- &zcache_evicted_raw_pages_attr.attr,
- &zcache_evicted_unbuddied_pages_attr.attr,
- &zcache_evicted_buddied_pages_attr.attr,
- &zcache_failed_get_free_pages_attr.attr,
- &zcache_failed_alloc_attr.attr,
- &zcache_put_to_flush_attr.attr,
- &zcache_zbud_unbuddied_list_counts_attr.attr,
- &zcache_zbud_cumul_chunk_counts_attr.attr,
- &zcache_zv_curr_dist_counts_attr.attr,
- &zcache_zv_cumul_dist_counts_attr.attr,
- &zcache_zv_max_zsize_attr.attr,
- &zcache_zv_max_mean_zsize_attr.attr,
- &zcache_zv_page_count_policy_percent_attr.attr,
- NULL,
-};
-
-static struct attribute_group zcache_attr_group = {
- .attrs = zcache_attrs,
- .name = "zcache",
-};
-
-#define RAMSTER_SYSFS_RO(_name) \
- static ssize_t ramster_##_name##_show(struct kobject *kobj, \
- struct kobj_attribute *attr, char *buf) \
- { \
- return sprintf(buf, "%lu\n", ramster_##_name); \
- } \
- static struct kobj_attribute ramster_##_name##_attr = { \
- .attr = { .name = __stringify(_name), .mode = 0444 }, \
- .show = ramster_##_name##_show, \
- }
-
-#define RAMSTER_SYSFS_RW(_name) \
- static ssize_t ramster_##_name##_show(struct kobject *kobj, \
- struct kobj_attribute *attr, char *buf) \
- { \
- return sprintf(buf, "%lu\n", ramster_##_name); \
- } \
- static ssize_t ramster_##_name##_store(struct kobject *kobj, \
- struct kobj_attribute *attr, const char *buf, size_t count) \
- { \
- int err; \
- unsigned long enable; \
- err = kstrtoul(buf, 10, &enable); \
- if (err) \
- return -EINVAL; \
- ramster_##_name = enable; \
- return count; \
- } \
- static struct kobj_attribute ramster_##_name##_attr = { \
- .attr = { .name = __stringify(_name), .mode = 0644 }, \
- .show = ramster_##_name##_show, \
- .store = ramster_##_name##_store, \
- }
-
-#define RAMSTER_SYSFS_RO_ATOMIC(_name) \
- static ssize_t ramster_##_name##_show(struct kobject *kobj, \
- struct kobj_attribute *attr, char *buf) \
- { \
- return sprintf(buf, "%d\n", atomic_read(&ramster_##_name)); \
- } \
- static struct kobj_attribute ramster_##_name##_attr = { \
- .attr = { .name = __stringify(_name), .mode = 0444 }, \
- .show = ramster_##_name##_show, \
- }
-
-RAMSTER_SYSFS_RO(interface_revision);
-RAMSTER_SYSFS_RO_ATOMIC(remote_pers_pages);
-RAMSTER_SYSFS_RW(pers_remotify_enable);
-RAMSTER_SYSFS_RW(eph_remotify_enable);
-RAMSTER_SYSFS_RO(eph_pages_remoted);
-RAMSTER_SYSFS_RO(eph_pages_remote_failed);
-RAMSTER_SYSFS_RO(pers_pages_remoted);
-RAMSTER_SYSFS_RO(pers_pages_remote_failed);
-RAMSTER_SYSFS_RO(pers_pages_remote_nomem);
-RAMSTER_SYSFS_RO(remote_pages_flushed);
-RAMSTER_SYSFS_RO(remote_page_flushes_failed);
-RAMSTER_SYSFS_RO(remote_objects_flushed);
-RAMSTER_SYSFS_RO(remote_object_flushes_failed);
-RAMSTER_SYSFS_RO(remote_eph_pages_succ_get);
-RAMSTER_SYSFS_RO(remote_eph_pages_unsucc_get);
-RAMSTER_SYSFS_RO(remote_pers_pages_succ_get);
-RAMSTER_SYSFS_RO(remote_pers_pages_unsucc_get);
-RAMSTER_SYSFS_RO_ATOMIC(foreign_eph_pampd_count);
-RAMSTER_SYSFS_RO(foreign_eph_pampd_count_max);
-RAMSTER_SYSFS_RO_ATOMIC(foreign_pers_pampd_count);
-RAMSTER_SYSFS_RO(foreign_pers_pampd_count_max);
-RAMSTER_SYSFS_RO_ATOMIC(curr_flnode_count);
-RAMSTER_SYSFS_RO(curr_flnode_count_max);
-
-#define MANUAL_NODES 8
-static bool ramster_nodes_manual_up[MANUAL_NODES];
-static ssize_t ramster_manual_node_up_show(struct kobject *kobj,
- struct kobj_attribute *attr, char *buf)
-{
- int i;
- char *p = buf;
- for (i = 0; i < MANUAL_NODES; i++)
- if (ramster_nodes_manual_up[i])
- p += sprintf(p, "%d ", i);
- p += sprintf(p, "\n");
- return p - buf;
-}
-
-static ssize_t ramster_manual_node_up_store(struct kobject *kobj,
- struct kobj_attribute *attr, const char *buf, size_t count)
-{
- int err;
- unsigned long node_num;
-
- err = kstrtoul(buf, 10, &node_num);
- if (err) {
- pr_err("ramster: bad strtoul?\n");
- return -EINVAL;
- }
- if (node_num >= MANUAL_NODES) {
- pr_err("ramster: bad node_num=%lu?\n", node_num);
- return -EINVAL;
- }
- if (ramster_nodes_manual_up[node_num]) {
- pr_err("ramster: node %d already up, ignoring\n",
- (int)node_num);
- } else {
- ramster_nodes_manual_up[node_num] = true;
- r2net_hb_node_up_manual((int)node_num);
- }
- return count;
-}
-
-static struct kobj_attribute ramster_manual_node_up_attr = {
- .attr = { .name = "manual_node_up", .mode = 0644 },
- .show = ramster_manual_node_up_show,
- .store = ramster_manual_node_up_store,
-};
-
-static ssize_t ramster_remote_target_nodenum_show(struct kobject *kobj,
- struct kobj_attribute *attr, char *buf)
-{
- if (ramster_remote_target_nodenum == -1UL)
- return sprintf(buf, "unset\n");
- else
- return sprintf(buf, "%d\n", ramster_remote_target_nodenum);
-}
-
-static ssize_t ramster_remote_target_nodenum_store(struct kobject *kobj,
- struct kobj_attribute *attr, const char *buf, size_t count)
-{
- int err;
- unsigned long node_num;
-
- err = kstrtoul(buf, 10, &node_num);
- if (err) {
- pr_err("ramster: bad strtoul?\n");
- return -EINVAL;
- } else if (node_num == -1UL) {
- pr_err("ramster: disabling all remotification, "
- "data may still reside on remote nodes however\n");
- return -EINVAL;
- } else if (node_num >= MANUAL_NODES) {
- pr_err("ramster: bad node_num=%lu?\n", node_num);
- return -EINVAL;
- } else if (!ramster_nodes_manual_up[node_num]) {
- pr_err("ramster: node %d not up, ignoring setting "
- "of remotification target\n", (int)node_num);
- } else if (r2net_remote_target_node_set((int)node_num) >= 0) {
- pr_info("ramster: node %d set as remotification target\n",
- (int)node_num);
- ramster_remote_target_nodenum = (int)node_num;
- } else {
- pr_err("ramster: bad num to node node_num=%d?\n",
- (int)node_num);
- return -EINVAL;
- }
- return count;
-}
-
-static struct kobj_attribute ramster_remote_target_nodenum_attr = {
- .attr = { .name = "remote_target_nodenum", .mode = 0644 },
- .show = ramster_remote_target_nodenum_show,
- .store = ramster_remote_target_nodenum_store,
-};
-
-
-static struct attribute *ramster_attrs[] = {
- &ramster_interface_revision_attr.attr,
- &ramster_pers_remotify_enable_attr.attr,
- &ramster_eph_remotify_enable_attr.attr,
- &ramster_remote_pers_pages_attr.attr,
- &ramster_eph_pages_remoted_attr.attr,
- &ramster_eph_pages_remote_failed_attr.attr,
- &ramster_pers_pages_remoted_attr.attr,
- &ramster_pers_pages_remote_failed_attr.attr,
- &ramster_pers_pages_remote_nomem_attr.attr,
- &ramster_remote_pages_flushed_attr.attr,
- &ramster_remote_page_flushes_failed_attr.attr,
- &ramster_remote_objects_flushed_attr.attr,
- &ramster_remote_object_flushes_failed_attr.attr,
- &ramster_remote_eph_pages_succ_get_attr.attr,
- &ramster_remote_eph_pages_unsucc_get_attr.attr,
- &ramster_remote_pers_pages_succ_get_attr.attr,
- &ramster_remote_pers_pages_unsucc_get_attr.attr,
- &ramster_foreign_eph_pampd_count_attr.attr,
- &ramster_foreign_eph_pampd_count_max_attr.attr,
- &ramster_foreign_pers_pampd_count_attr.attr,
- &ramster_foreign_pers_pampd_count_max_attr.attr,
- &ramster_curr_flnode_count_attr.attr,
- &ramster_curr_flnode_count_max_attr.attr,
- &ramster_manual_node_up_attr.attr,
- &ramster_remote_target_nodenum_attr.attr,
- NULL,
-};
-
-static struct attribute_group ramster_attr_group = {
- .attrs = ramster_attrs,
- .name = "ramster",
-};
-
-#endif /* CONFIG_SYSFS */
-/*
- * When zcache is disabled ("frozen"), pools can be created and destroyed,
- * but all puts (and thus all other operations that require memory allocation)
- * must fail. If zcache is unfrozen, accepts puts, then frozen again,
- * data consistency requires all puts while frozen to be converted into
- * flushes.
- */
-static bool zcache_freeze;
-
-/*
- * zcache shrinker interface (only useful for ephemeral pages, so zbud only)
- */
-static int shrink_zcache_memory(struct shrinker *shrink,
- struct shrink_control *sc)
-{
- int ret = -1;
- int nr = sc->nr_to_scan;
- gfp_t gfp_mask = sc->gfp_mask;
-
- if (nr >= 0) {
- if (!(gfp_mask & __GFP_FS))
- /* does this case really need to be skipped? */
- goto out;
- zbud_evict_pages(nr);
- }
- ret = (int)atomic_read(&zcache_zbud_curr_raw_pages);
-out:
- return ret;
-}
-
-static struct shrinker zcache_shrinker = {
- .shrink = shrink_zcache_memory,
- .seeks = DEFAULT_SEEKS,
-};
-
-/*
- * zcache shims between cleancache/frontswap ops and tmem
- */
-
-int zcache_put(int cli_id, int pool_id, struct tmem_oid *oidp,
- uint32_t index, char *data, size_t size,
- bool raw, int ephemeral)
-{
- struct tmem_pool *pool;
- int ret = -1;
-
- BUG_ON(!irqs_disabled());
- pool = zcache_get_pool_by_id(cli_id, pool_id);
- if (unlikely(pool == NULL))
- goto out;
- if (!zcache_freeze && zcache_do_preload(pool) == 0) {
- /* preload does preempt_disable on success */
- ret = tmem_put(pool, oidp, index, data, size, raw, ephemeral);
- if (ret < 0) {
- if (is_ephemeral(pool))
- zcache_failed_eph_puts++;
- else
- zcache_failed_pers_puts++;
- }
- zcache_put_pool(pool);
- preempt_enable_no_resched();
- } else {
- zcache_put_to_flush++;
- if (atomic_read(&pool->obj_count) > 0)
- /* the put fails whether the flush succeeds or not */
- (void)tmem_flush_page(pool, oidp, index);
- zcache_put_pool(pool);
- }
-out:
- return ret;
-}
-
-int zcache_get(int cli_id, int pool_id, struct tmem_oid *oidp,
- uint32_t index, char *data, size_t *sizep,
- bool raw, int get_and_free)
-{
- struct tmem_pool *pool;
- int ret = -1;
- bool eph;
-
- if (!raw) {
- BUG_ON(irqs_disabled());
- BUG_ON(in_softirq());
- }
- pool = zcache_get_pool_by_id(cli_id, pool_id);
- eph = is_ephemeral(pool);
- if (likely(pool != NULL)) {
- if (atomic_read(&pool->obj_count) > 0)
- ret = tmem_get(pool, oidp, index, data, sizep,
- raw, get_and_free);
- zcache_put_pool(pool);
- }
- WARN_ONCE((!eph && (ret != 0)), "zcache_get fails on persistent pool, "
- "bad things are very likely to happen soon\n");
-#ifdef RAMSTER_TESTING
- if (ret != 0 && ret != -1 && !(ret == -EINVAL && is_ephemeral(pool)))
- pr_err("TESTING zcache_get tmem_get returns ret=%d\n", ret);
-#endif
- if (ret == -EAGAIN)
- BUG(); /* FIXME... don't need this anymore??? let's ensure */
- return ret;
-}
-
-int zcache_flush(int cli_id, int pool_id,
- struct tmem_oid *oidp, uint32_t index)
-{
- struct tmem_pool *pool;
- int ret = -1;
- unsigned long flags;
-
- local_irq_save(flags);
- zcache_flush_total++;
- pool = zcache_get_pool_by_id(cli_id, pool_id);
- ramster_do_preload_flnode_only(pool);
- if (likely(pool != NULL)) {
- if (atomic_read(&pool->obj_count) > 0)
- ret = tmem_flush_page(pool, oidp, index);
- zcache_put_pool(pool);
- }
- if (ret >= 0)
- zcache_flush_found++;
- local_irq_restore(flags);
- return ret;
-}
-
-int zcache_flush_object(int cli_id, int pool_id, struct tmem_oid *oidp)
-{
- struct tmem_pool *pool;
- int ret = -1;
- unsigned long flags;
-
- local_irq_save(flags);
- zcache_flobj_total++;
- pool = zcache_get_pool_by_id(cli_id, pool_id);
- ramster_do_preload_flnode_only(pool);
- if (likely(pool != NULL)) {
- if (atomic_read(&pool->obj_count) > 0)
- ret = tmem_flush_object(pool, oidp);
- zcache_put_pool(pool);
- }
- if (ret >= 0)
- zcache_flobj_found++;
- local_irq_restore(flags);
- return ret;
-}
-
-int zcache_client_destroy_pool(int cli_id, int pool_id)
-{
- struct tmem_pool *pool = NULL;
- struct zcache_client *cli = NULL;
- int ret = -1;
-
- if (pool_id < 0)
- goto out;
- if (cli_id == LOCAL_CLIENT)
- cli = &zcache_host;
- else if ((unsigned int)cli_id < MAX_CLIENTS)
- cli = &zcache_clients[cli_id];
- if (cli == NULL)
- goto out;
- atomic_inc(&cli->refcount);
- pool = cli->tmem_pools[pool_id];
- if (pool == NULL)
- goto out;
- cli->tmem_pools[pool_id] = NULL;
- /* wait for pool activity on other cpus to quiesce */
- while (atomic_read(&pool->refcount) != 0)
- ;
- atomic_dec(&cli->refcount);
- local_bh_disable();
- ret = tmem_destroy_pool(pool);
- local_bh_enable();
- kfree(pool);
- pr_info("ramster: destroyed pool id=%d cli_id=%d\n", pool_id, cli_id);
-out:
- return ret;
-}
-
-static int zcache_destroy_pool(int pool_id)
-{
- return zcache_client_destroy_pool(LOCAL_CLIENT, pool_id);
-}
-
-int zcache_new_pool(uint16_t cli_id, uint32_t flags)
-{
- int poolid = -1;
- struct tmem_pool *pool;
- struct zcache_client *cli = NULL;
-
- if (cli_id == LOCAL_CLIENT)
- cli = &zcache_host;
- else if ((unsigned int)cli_id < MAX_CLIENTS)
- cli = &zcache_clients[cli_id];
- if (cli == NULL)
- goto out;
- atomic_inc(&cli->refcount);
- pool = kmalloc(sizeof(struct tmem_pool), GFP_ATOMIC);
- if (pool == NULL) {
- pr_info("ramster: pool creation failed: out of memory\n");
- goto out;
- }
-
- for (poolid = 0; poolid < MAX_POOLS_PER_CLIENT; poolid++)
- if (cli->tmem_pools[poolid] == NULL)
- break;
- if (poolid >= MAX_POOLS_PER_CLIENT) {
- pr_info("ramster: pool creation failed: max exceeded\n");
- kfree(pool);
- poolid = -1;
- goto out;
- }
- atomic_set(&pool->refcount, 0);
- pool->client = cli;
- pool->pool_id = poolid;
- tmem_new_pool(pool, flags);
- cli->tmem_pools[poolid] = pool;
- if (cli_id == LOCAL_CLIENT)
- pr_info("ramster: created %s tmem pool, id=%d, local client\n",
- flags & TMEM_POOL_PERSIST ? "persistent" : "ephemeral",
- poolid);
- else
- pr_info("ramster: created %s tmem pool, id=%d, client=%d\n",
- flags & TMEM_POOL_PERSIST ? "persistent" : "ephemeral",
- poolid, cli_id);
-out:
- if (cli != NULL)
- atomic_dec(&cli->refcount);
- return poolid;
-}
-
-static int zcache_local_new_pool(uint32_t flags)
-{
- return zcache_new_pool(LOCAL_CLIENT, flags);
-}
-
-int zcache_autocreate_pool(int cli_id, int pool_id, bool ephemeral)
-{
- struct tmem_pool *pool;
- struct zcache_client *cli = NULL;
- uint32_t flags = ephemeral ? 0 : TMEM_POOL_PERSIST;
- int ret = -1;
-
- if (cli_id == LOCAL_CLIENT)
- goto out;
- if (pool_id >= MAX_POOLS_PER_CLIENT)
- goto out;
- else if ((unsigned int)cli_id < MAX_CLIENTS)
- cli = &zcache_clients[cli_id];
- if ((ephemeral && !use_cleancache) || (!ephemeral && !use_frontswap))
- BUG(); /* FIXME, handle more gracefully later */
- if (!cli->allocated) {
- if (zcache_new_client(cli_id))
- BUG(); /* FIXME, handle more gracefully later */
- cli = &zcache_clients[cli_id];
- }
- atomic_inc(&cli->refcount);
- pool = cli->tmem_pools[pool_id];
- if (pool != NULL) {
- if (pool->persistent && ephemeral) {
- pr_err("zcache_autocreate_pool: type mismatch\n");
- goto out;
- }
- ret = 0;
- goto out;
- }
- pool = kmalloc(sizeof(struct tmem_pool), GFP_KERNEL);
- if (pool == NULL) {
- pr_info("ramster: pool creation failed: out of memory\n");
- goto out;
- }
- atomic_set(&pool->refcount, 0);
- pool->client = cli;
- pool->pool_id = pool_id;
- tmem_new_pool(pool, flags);
- cli->tmem_pools[pool_id] = pool;
- pr_info("ramster: AUTOcreated %s tmem poolid=%d, for remote client=%d\n",
- flags & TMEM_POOL_PERSIST ? "persistent" : "ephemeral",
- pool_id, cli_id);
- ret = 0;
-out:
- if (cli == NULL)
- BUG(); /* FIXME, handle more gracefully later */
- /* pr_err("zcache_autocreate_pool: failed\n"); */
- if (cli != NULL)
- atomic_dec(&cli->refcount);
- return ret;
-}
-
-/**********
- * Two kernel functionalities currently can be layered on top of tmem.
- * These are "cleancache" which is used as a second-chance cache for clean
- * page cache pages; and "frontswap" which is used for swap pages
- * to avoid writes to disk. A generic "shim" is provided here for each
- * to translate in-kernel semantics to zcache semantics.
- */
-
-#ifdef CONFIG_CLEANCACHE
-static void zcache_cleancache_put_page(int pool_id,
- struct cleancache_filekey key,
- pgoff_t index, struct page *page)
-{
- u32 ind = (u32) index;
- struct tmem_oid oid = *(struct tmem_oid *)&key;
-
-#ifdef __PG_WAS_ACTIVE
- if (!PageWasActive(page)) {
- zcache_nonactive_puts++;
- return;
- }
-#endif
- if (likely(ind == index)) {
- char *kva = page_address(page);
-
- (void)zcache_put(LOCAL_CLIENT, pool_id, &oid, index,
- kva, PAGE_SIZE, 0, 1);
- }
-}
-
-static int zcache_cleancache_get_page(int pool_id,
- struct cleancache_filekey key,
- pgoff_t index, struct page *page)
-{
- u32 ind = (u32) index;
- struct tmem_oid oid = *(struct tmem_oid *)&key;
- int ret = -1;
-
- preempt_disable();
- if (likely(ind == index)) {
- char *kva = page_address(page);
- size_t size = PAGE_SIZE;
-
- ret = zcache_get(LOCAL_CLIENT, pool_id, &oid, index,
- kva, &size, 0, 0);
-#ifdef __PG_WAS_ACTIVE
- if (ret == 0)
- SetPageWasActive(page);
-#endif
- }
- preempt_enable();
- return ret;
-}
-
-static void zcache_cleancache_flush_page(int pool_id,
- struct cleancache_filekey key,
- pgoff_t index)
-{
- u32 ind = (u32) index;
- struct tmem_oid oid = *(struct tmem_oid *)&key;
-
- if (likely(ind == index))
- (void)zcache_flush(LOCAL_CLIENT, pool_id, &oid, ind);
-}
-
-static void zcache_cleancache_flush_inode(int pool_id,
- struct cleancache_filekey key)
-{
- struct tmem_oid oid = *(struct tmem_oid *)&key;
-
- (void)zcache_flush_object(LOCAL_CLIENT, pool_id, &oid);
-}
-
-static void zcache_cleancache_flush_fs(int pool_id)
-{
- if (pool_id >= 0)
- (void)zcache_destroy_pool(pool_id);
-}
-
-static int zcache_cleancache_init_fs(size_t pagesize)
-{
- BUG_ON(sizeof(struct cleancache_filekey) !=
- sizeof(struct tmem_oid));
- BUG_ON(pagesize != PAGE_SIZE);
- return zcache_local_new_pool(0);
-}
-
-static int zcache_cleancache_init_shared_fs(char *uuid, size_t pagesize)
-{
- /* shared pools are unsupported and map to private */
- BUG_ON(sizeof(struct cleancache_filekey) !=
- sizeof(struct tmem_oid));
- BUG_ON(pagesize != PAGE_SIZE);
- return zcache_local_new_pool(0);
-}
-
-static struct cleancache_ops zcache_cleancache_ops = {
- .put_page = zcache_cleancache_put_page,
- .get_page = zcache_cleancache_get_page,
- .invalidate_page = zcache_cleancache_flush_page,
- .invalidate_inode = zcache_cleancache_flush_inode,
- .invalidate_fs = zcache_cleancache_flush_fs,
- .init_shared_fs = zcache_cleancache_init_shared_fs,
- .init_fs = zcache_cleancache_init_fs
-};
-
-struct cleancache_ops zcache_cleancache_register_ops(void)
-{
- struct cleancache_ops old_ops =
- cleancache_register_ops(&zcache_cleancache_ops);
-
- return old_ops;
-}
-#endif
-
-#ifdef CONFIG_FRONTSWAP
-/* a single tmem poolid is used for all frontswap "types" (swapfiles) */
-static int zcache_frontswap_poolid = -1;
-
-/*
- * Swizzling increases objects per swaptype, increasing tmem concurrency
- * for heavy swaploads. Later, larger nr_cpus -> larger SWIZ_BITS
- */
-#define SWIZ_BITS 8
-#define SWIZ_MASK ((1 << SWIZ_BITS) - 1)
-#define _oswiz(_type, _ind) ((_type << SWIZ_BITS) | (_ind & SWIZ_MASK))
-#define iswiz(_ind) (_ind >> SWIZ_BITS)
-
-static inline struct tmem_oid oswiz(unsigned type, u32 ind)
-{
- struct tmem_oid oid = { .oid = { 0 } };
- oid.oid[0] = _oswiz(type, ind);
- return oid;
-}
-
-static int zcache_frontswap_store(unsigned type, pgoff_t offset,
- struct page *page)
-{
- u64 ind64 = (u64)offset;
- u32 ind = (u32)offset;
- struct tmem_oid oid = oswiz(type, ind);
- int ret = -1;
- unsigned long flags;
- char *kva;
-
- BUG_ON(!PageLocked(page));
- if (likely(ind64 == ind)) {
- local_irq_save(flags);
- kva = page_address(page);
- ret = zcache_put(LOCAL_CLIENT, zcache_frontswap_poolid,
- &oid, iswiz(ind), kva, PAGE_SIZE, 0, 0);
- local_irq_restore(flags);
- }
- return ret;
-}
-
-/* returns 0 if the page was successfully gotten from frontswap, -1 if
- * was not present (should never happen!) */
-static int zcache_frontswap_load(unsigned type, pgoff_t offset,
- struct page *page)
-{
- u64 ind64 = (u64)offset;
- u32 ind = (u32)offset;
- struct tmem_oid oid = oswiz(type, ind);
- int ret = -1;
-
- preempt_disable(); /* FIXME, remove this? */
- BUG_ON(!PageLocked(page));
- if (likely(ind64 == ind)) {
- char *kva = page_address(page);
- size_t size = PAGE_SIZE;
-
- ret = zcache_get(LOCAL_CLIENT, zcache_frontswap_poolid,
- &oid, iswiz(ind), kva, &size, 0, -1);
- }
- preempt_enable(); /* FIXME, remove this? */
- return ret;
-}
-
-/* flush a single page from frontswap */
-static void zcache_frontswap_flush_page(unsigned type, pgoff_t offset)
-{
- u64 ind64 = (u64)offset;
- u32 ind = (u32)offset;
- struct tmem_oid oid = oswiz(type, ind);
-
- if (likely(ind64 == ind))
- (void)zcache_flush(LOCAL_CLIENT, zcache_frontswap_poolid,
- &oid, iswiz(ind));
-}
-
-/* flush all pages from the passed swaptype */
-static void zcache_frontswap_flush_area(unsigned type)
-{
- struct tmem_oid oid;
- int ind;
-
- for (ind = SWIZ_MASK; ind >= 0; ind--) {
- oid = oswiz(type, ind);
- (void)zcache_flush_object(LOCAL_CLIENT,
- zcache_frontswap_poolid, &oid);
- }
-}
-
-static void zcache_frontswap_init(unsigned ignored)
-{
- /* a single tmem poolid is used for all frontswap "types" (swapfiles) */
- if (zcache_frontswap_poolid < 0)
- zcache_frontswap_poolid =
- zcache_local_new_pool(TMEM_POOL_PERSIST);
-}
-
-static struct frontswap_ops zcache_frontswap_ops = {
- .store = zcache_frontswap_store,
- .load = zcache_frontswap_load,
- .invalidate_page = zcache_frontswap_flush_page,
- .invalidate_area = zcache_frontswap_flush_area,
- .init = zcache_frontswap_init
-};
-
-struct frontswap_ops zcache_frontswap_register_ops(void)
-{
- struct frontswap_ops old_ops =
- frontswap_register_ops(&zcache_frontswap_ops);
-
- return old_ops;
-}
-#endif
-
-/*
- * frontswap selfshrinking
- */
-
-#ifdef CONFIG_FRONTSWAP
-/* In HZ, controls frequency of worker invocation. */
-static unsigned int selfshrink_interval __read_mostly = 5;
-
-static void selfshrink_process(struct work_struct *work);
-static DECLARE_DELAYED_WORK(selfshrink_worker, selfshrink_process);
-
-/* Enable/disable with sysfs. */
-static bool frontswap_selfshrinking __read_mostly;
-
-/* Enable/disable with kernel boot option. */
-static bool use_frontswap_selfshrink __initdata = true;
-
-/*
- * The default values for the following parameters were deemed reasonable
- * by experimentation, may be workload-dependent, and can all be
- * adjusted via sysfs.
- */
-
-/* Control rate for frontswap shrinking. Higher hysteresis is slower. */
-static unsigned int frontswap_hysteresis __read_mostly = 20;
-
-/*
- * Number of selfshrink worker invocations to wait before observing that
- * frontswap selfshrinking should commence. Note that selfshrinking does
- * not use a separate worker thread.
- */
-static unsigned int frontswap_inertia __read_mostly = 3;
-
-/* Countdown to next invocation of frontswap_shrink() */
-static unsigned long frontswap_inertia_counter;
-
-/*
- * Invoked by the selfshrink worker thread, uses current number of pages
- * in frontswap (frontswap_curr_pages()), previous status, and control
- * values (hysteresis and inertia) to determine if frontswap should be
- * shrunk and what the new frontswap size should be. Note that
- * frontswap_shrink is essentially a partial swapoff that immediately
- * transfers pages from the "swap device" (frontswap) back into kernel
- * RAM; despite the name, frontswap "shrinking" is very different from
- * the "shrinker" interface used by the kernel MM subsystem to reclaim
- * memory.
- */
-static void frontswap_selfshrink(void)
-{
- static unsigned long cur_frontswap_pages;
- static unsigned long last_frontswap_pages;
- static unsigned long tgt_frontswap_pages;
-
- last_frontswap_pages = cur_frontswap_pages;
- cur_frontswap_pages = frontswap_curr_pages();
- if (!cur_frontswap_pages ||
- (cur_frontswap_pages > last_frontswap_pages)) {
- frontswap_inertia_counter = frontswap_inertia;
- return;
- }
- if (frontswap_inertia_counter && --frontswap_inertia_counter)
- return;
- if (cur_frontswap_pages <= frontswap_hysteresis)
- tgt_frontswap_pages = 0;
- else
- tgt_frontswap_pages = cur_frontswap_pages -
- (cur_frontswap_pages / frontswap_hysteresis);
- frontswap_shrink(tgt_frontswap_pages);
-}
-
-static int __init ramster_nofrontswap_selfshrink_setup(char *s)
-{
- use_frontswap_selfshrink = false;
- return 1;
-}
-
-__setup("noselfshrink", ramster_nofrontswap_selfshrink_setup);
-
-static void selfshrink_process(struct work_struct *work)
-{
- if (frontswap_selfshrinking && frontswap_enabled) {
- frontswap_selfshrink();
- schedule_delayed_work(&selfshrink_worker,
- selfshrink_interval * HZ);
- }
-}
-
-static int ramster_enabled;
-
-static int __init ramster_selfshrink_init(void)
-{
- frontswap_selfshrinking = ramster_enabled && use_frontswap_selfshrink;
- if (frontswap_selfshrinking)
- pr_info("ramster: Initializing frontswap "
- "selfshrinking driver.\n");
- else
- return -ENODEV;
-
- schedule_delayed_work(&selfshrink_worker, selfshrink_interval * HZ);
-
- return 0;
-}
-
-subsys_initcall(ramster_selfshrink_init);
-#endif
-
-/*
- * zcache initialization
- * NOTE FOR NOW ramster MUST BE PROVIDED AS A KERNEL BOOT PARAMETER OR
- * NOTHING HAPPENS!
- */
-
-static int ramster_enabled;
-
-static int __init enable_ramster(char *s)
-{
- ramster_enabled = 1;
- return 1;
-}
-__setup("ramster", enable_ramster);
-
-/* allow independent dynamic disabling of cleancache and frontswap */
-
-static int use_cleancache = 1;
-
-static int __init no_cleancache(char *s)
-{
- pr_info("INIT no_cleancache called\n");
- use_cleancache = 0;
- return 1;
-}
-
-/*
- * FIXME: need to guarantee this gets checked before zcache_init is called
- * What is the correct way to achieve this?
- */
-early_param("nocleancache", no_cleancache);
-
-static int use_frontswap = 1;
-
-static int __init no_frontswap(char *s)
-{
- pr_info("INIT no_frontswap called\n");
- use_frontswap = 0;
- return 1;
-}
-
-__setup("nofrontswap", no_frontswap);
-
-static int __init zcache_init(void)
-{
- int ret = 0;
-
-#ifdef CONFIG_SYSFS
- ret = sysfs_create_group(mm_kobj, &zcache_attr_group);
- ret = sysfs_create_group(mm_kobj, &ramster_attr_group);
- if (ret) {
- pr_err("ramster: can't create sysfs\n");
- goto out;
- }
-#endif /* CONFIG_SYSFS */
-#if defined(CONFIG_CLEANCACHE) || defined(CONFIG_FRONTSWAP)
- if (ramster_enabled) {
- unsigned int cpu;
-
- (void)r2net_register_handlers();
- tmem_register_hostops(&zcache_hostops);
- tmem_register_pamops(&zcache_pamops);
- ret = register_cpu_notifier(&zcache_cpu_notifier_block);
- if (ret) {
- pr_err("ramster: can't register cpu notifier\n");
- goto out;
- }
- for_each_online_cpu(cpu) {
- void *pcpu = (void *)(long)cpu;
- zcache_cpu_notifier(&zcache_cpu_notifier_block,
- CPU_UP_PREPARE, pcpu);
- }
- }
- zcache_objnode_cache = kmem_cache_create("zcache_objnode",
- sizeof(struct tmem_objnode), 0, 0, NULL);
- zcache_obj_cache = kmem_cache_create("zcache_obj",
- sizeof(struct tmem_obj), 0, 0, NULL);
- ramster_flnode_cache = kmem_cache_create("ramster_flnode",
- sizeof(struct flushlist_node), 0, 0, NULL);
-#endif
-#ifdef CONFIG_CLEANCACHE
- pr_info("INIT ramster_enabled=%d use_cleancache=%d\n",
- ramster_enabled, use_cleancache);
- if (ramster_enabled && use_cleancache) {
- struct cleancache_ops old_ops;
-
- zbud_init();
- register_shrinker(&zcache_shrinker);
- old_ops = zcache_cleancache_register_ops();
- pr_info("ramster: cleancache enabled using kernel "
- "transcendent memory and compression buddies\n");
- if (old_ops.init_fs != NULL)
- pr_warning("ramster: cleancache_ops overridden");
- }
-#endif
-#ifdef CONFIG_FRONTSWAP
- pr_info("INIT ramster_enabled=%d use_frontswap=%d\n",
- ramster_enabled, use_frontswap);
- if (ramster_enabled && use_frontswap) {
- struct frontswap_ops old_ops;
-
- zcache_new_client(LOCAL_CLIENT);
- old_ops = zcache_frontswap_register_ops();
- pr_info("ramster: frontswap enabled using kernel "
- "transcendent memory and xvmalloc\n");
- if (old_ops.init != NULL)
- pr_warning("ramster: frontswap_ops overridden");
- }
- if (ramster_enabled && (use_frontswap || use_cleancache))
- ramster_remotify_init();
-#endif
-out:
- return ret;
-}
-
-module_init(zcache_init)
diff --git a/drivers/staging/ramster/zcache.h b/drivers/staging/ramster/zcache.h
deleted file mode 100644
index 250b121..0000000
--- a/drivers/staging/ramster/zcache.h
+++ /dev/null
@@ -1,22 +0,0 @@
-/*
- * zcache.h
- *
- * External zcache functions
- *
- * Copyright (c) 2009-2012, Dan Magenheimer, Oracle Corp.
- */
-
-#ifndef _ZCACHE_H_
-#define _ZCACHE_H_
-
-extern int zcache_put(int, int, struct tmem_oid *, uint32_t,
- char *, size_t, bool, int);
-extern int zcache_autocreate_pool(int, int, bool);
-extern int zcache_get(int, int, struct tmem_oid *, uint32_t,
- char *, size_t *, bool, int);
-extern int zcache_flush(int, int, struct tmem_oid *, uint32_t);
-extern int zcache_flush_object(int, int, struct tmem_oid *);
-extern int zcache_localify(int, struct tmem_oid *, uint32_t,
- char *, size_t, void *);
-
-#endif /* _ZCACHE_H */
diff --git a/drivers/staging/zcache/Kconfig b/drivers/staging/zcache/Kconfig
deleted file mode 100644
index 7048e01..0000000
--- a/drivers/staging/zcache/Kconfig
+++ /dev/null
@@ -1,14 +0,0 @@
-config ZCACHE
- bool "Dynamic compression of swap pages and clean pagecache pages"
- # X86 dependency is because zsmalloc uses non-portable pte/tlb
- # functions
- depends on (CLEANCACHE || FRONTSWAP) && CRYPTO=y && X86
- select ZSMALLOC
- select CRYPTO_LZO
- default n
- help
- Zcache doubles RAM efficiency while providing a significant
- performance boosts on many workloads. Zcache uses
- compression and an in-kernel implementation of transcendent
- memory to store clean page cache pages and swap in RAM,
- providing a noticeable reduction in disk I/O.
diff --git a/drivers/staging/zcache/Makefile b/drivers/staging/zcache/Makefile
deleted file mode 100644
index 60daa27..0000000
--- a/drivers/staging/zcache/Makefile
+++ /dev/null
@@ -1,3 +0,0 @@
-zcache-y := zcache-main.o tmem.o
-
-obj-$(CONFIG_ZCACHE) += zcache.o
diff --git a/drivers/staging/zcache/tmem.c b/drivers/staging/zcache/tmem.c
deleted file mode 100644
index 1ca66ea..0000000
--- a/drivers/staging/zcache/tmem.c
+++ /dev/null
@@ -1,770 +0,0 @@
-/*
- * In-kernel transcendent memory (generic implementation)
- *
- * Copyright (c) 2009-2011, Dan Magenheimer, Oracle Corp.
- *
- * The primary purpose of Transcedent Memory ("tmem") is to map object-oriented
- * "handles" (triples containing a pool id, and object id, and an index), to
- * pages in a page-accessible memory (PAM). Tmem references the PAM pages via
- * an abstract "pampd" (PAM page-descriptor), which can be operated on by a
- * set of functions (pamops). Each pampd contains some representation of
- * PAGE_SIZE bytes worth of data. Tmem must support potentially millions of
- * pages and must be able to insert, find, and delete these pages at a
- * potential frequency of thousands per second concurrently across many CPUs,
- * (and, if used with KVM, across many vcpus across many guests).
- * Tmem is tracked with a hierarchy of data structures, organized by
- * the elements in a handle-tuple: pool_id, object_id, and page index.
- * One or more "clients" (e.g. guests) each provide one or more tmem_pools.
- * Each pool, contains a hash table of rb_trees of tmem_objs. Each
- * tmem_obj contains a radix-tree-like tree of pointers, with intermediate
- * nodes called tmem_objnodes. Each leaf pointer in this tree points to
- * a pampd, which is accessible only through a small set of callbacks
- * registered by the PAM implementation (see tmem_register_pamops). Tmem
- * does all memory allocation via a set of callbacks registered by the tmem
- * host implementation (e.g. see tmem_register_hostops).
- */
-
-#include <linux/list.h>
-#include <linux/spinlock.h>
-#include <linux/atomic.h>
-
-#include "tmem.h"
-
-/* data structure sentinels used for debugging... see tmem.h */
-#define POOL_SENTINEL 0x87658765
-#define OBJ_SENTINEL 0x12345678
-#define OBJNODE_SENTINEL 0xfedcba09
-
-/*
- * A tmem host implementation must use this function to register callbacks
- * for memory allocation.
- */
-static struct tmem_hostops tmem_hostops;
-
-static void tmem_objnode_tree_init(void);
-
-void tmem_register_hostops(struct tmem_hostops *m)
-{
- tmem_objnode_tree_init();
- tmem_hostops = *m;
-}
-
-/*
- * A tmem host implementation must use this function to register
- * callbacks for a page-accessible memory (PAM) implementation
- */
-static struct tmem_pamops tmem_pamops;
-
-void tmem_register_pamops(struct tmem_pamops *m)
-{
- tmem_pamops = *m;
-}
-
-/*
- * Oid's are potentially very sparse and tmem_objs may have an indeterminately
- * short life, being added and deleted at a relatively high frequency.
- * So an rb_tree is an ideal data structure to manage tmem_objs. But because
- * of the potentially huge number of tmem_objs, each pool manages a hashtable
- * of rb_trees to reduce search, insert, delete, and rebalancing time.
- * Each hashbucket also has a lock to manage concurrent access.
- *
- * The following routines manage tmem_objs. When any tmem_obj is accessed,
- * the hashbucket lock must be held.
- */
-
-/* searches for object==oid in pool, returns locked object if found */
-static struct tmem_obj *tmem_obj_find(struct tmem_hashbucket *hb,
- struct tmem_oid *oidp)
-{
- struct rb_node *rbnode;
- struct tmem_obj *obj;
-
- rbnode = hb->obj_rb_root.rb_node;
- while (rbnode) {
- BUG_ON(RB_EMPTY_NODE(rbnode));
- obj = rb_entry(rbnode, struct tmem_obj, rb_tree_node);
- switch (tmem_oid_compare(oidp, &obj->oid)) {
- case 0: /* equal */
- goto out;
- case -1:
- rbnode = rbnode->rb_left;
- break;
- case 1:
- rbnode = rbnode->rb_right;
- break;
- }
- }
- obj = NULL;
-out:
- return obj;
-}
-
-static void tmem_pampd_destroy_all_in_obj(struct tmem_obj *);
-
-/* free an object that has no more pampds in it */
-static void tmem_obj_free(struct tmem_obj *obj, struct tmem_hashbucket *hb)
-{
- struct tmem_pool *pool;
-
- BUG_ON(obj == NULL);
- ASSERT_SENTINEL(obj, OBJ);
- BUG_ON(obj->pampd_count > 0);
- pool = obj->pool;
- BUG_ON(pool == NULL);
- if (obj->objnode_tree_root != NULL) /* may be "stump" with no leaves */
- tmem_pampd_destroy_all_in_obj(obj);
- BUG_ON(obj->objnode_tree_root != NULL);
- BUG_ON((long)obj->objnode_count != 0);
- atomic_dec(&pool->obj_count);
- BUG_ON(atomic_read(&pool->obj_count) < 0);
- INVERT_SENTINEL(obj, OBJ);
- obj->pool = NULL;
- tmem_oid_set_invalid(&obj->oid);
- rb_erase(&obj->rb_tree_node, &hb->obj_rb_root);
-}
-
-/*
- * initialize, and insert an tmem_object_root (called only if find failed)
- */
-static void tmem_obj_init(struct tmem_obj *obj, struct tmem_hashbucket *hb,
- struct tmem_pool *pool,
- struct tmem_oid *oidp)
-{
- struct rb_root *root = &hb->obj_rb_root;
- struct rb_node **new = &(root->rb_node), *parent = NULL;
- struct tmem_obj *this;
-
- BUG_ON(pool == NULL);
- atomic_inc(&pool->obj_count);
- obj->objnode_tree_height = 0;
- obj->objnode_tree_root = NULL;
- obj->pool = pool;
- obj->oid = *oidp;
- obj->objnode_count = 0;
- obj->pampd_count = 0;
- (*tmem_pamops.new_obj)(obj);
- SET_SENTINEL(obj, OBJ);
- while (*new) {
- BUG_ON(RB_EMPTY_NODE(*new));
- this = rb_entry(*new, struct tmem_obj, rb_tree_node);
- parent = *new;
- switch (tmem_oid_compare(oidp, &this->oid)) {
- case 0:
- BUG(); /* already present; should never happen! */
- break;
- case -1:
- new = &(*new)->rb_left;
- break;
- case 1:
- new = &(*new)->rb_right;
- break;
- }
- }
- rb_link_node(&obj->rb_tree_node, parent, new);
- rb_insert_color(&obj->rb_tree_node, root);
-}
-
-/*
- * Tmem is managed as a set of tmem_pools with certain attributes, such as
- * "ephemeral" vs "persistent". These attributes apply to all tmem_objs
- * and all pampds that belong to a tmem_pool. A tmem_pool is created
- * or deleted relatively rarely (for example, when a filesystem is
- * mounted or unmounted.
- */
-
-/* flush all data from a pool and, optionally, free it */
-static void tmem_pool_flush(struct tmem_pool *pool, bool destroy)
-{
- struct rb_node *rbnode;
- struct tmem_obj *obj;
- struct tmem_hashbucket *hb = &pool->hashbucket[0];
- int i;
-
- BUG_ON(pool == NULL);
- for (i = 0; i < TMEM_HASH_BUCKETS; i++, hb++) {
- spin_lock(&hb->lock);
- rbnode = rb_first(&hb->obj_rb_root);
- while (rbnode != NULL) {
- obj = rb_entry(rbnode, struct tmem_obj, rb_tree_node);
- rbnode = rb_next(rbnode);
- tmem_pampd_destroy_all_in_obj(obj);
- tmem_obj_free(obj, hb);
- (*tmem_hostops.obj_free)(obj, pool);
- }
- spin_unlock(&hb->lock);
- }
- if (destroy)
- list_del(&pool->pool_list);
-}
-
-/*
- * A tmem_obj contains a radix-tree-like tree in which the intermediate
- * nodes are called tmem_objnodes. (The kernel lib/radix-tree.c implementation
- * is very specialized and tuned for specific uses and is not particularly
- * suited for use from this code, though some code from the core algorithms has
- * been reused, thus the copyright notices below). Each tmem_objnode contains
- * a set of pointers which point to either a set of intermediate tmem_objnodes
- * or a set of of pampds.
- *
- * Portions Copyright (C) 2001 Momchil Velikov
- * Portions Copyright (C) 2001 Christoph Hellwig
- * Portions Copyright (C) 2005 SGI, Christoph Lameter <clameter@xxxxxxx>
- */
-
-struct tmem_objnode_tree_path {
- struct tmem_objnode *objnode;
- int offset;
-};
-
-/* objnode height_to_maxindex translation */
-static unsigned long tmem_objnode_tree_h2max[OBJNODE_TREE_MAX_PATH + 1];
-
-static void tmem_objnode_tree_init(void)
-{
- unsigned int ht, tmp;
-
- for (ht = 0; ht < ARRAY_SIZE(tmem_objnode_tree_h2max); ht++) {
- tmp = ht * OBJNODE_TREE_MAP_SHIFT;
- if (tmp >= OBJNODE_TREE_INDEX_BITS)
- tmem_objnode_tree_h2max[ht] = ~0UL;
- else
- tmem_objnode_tree_h2max[ht] =
- (~0UL >> (OBJNODE_TREE_INDEX_BITS - tmp - 1)) >> 1;
- }
-}
-
-static struct tmem_objnode *tmem_objnode_alloc(struct tmem_obj *obj)
-{
- struct tmem_objnode *objnode;
-
- ASSERT_SENTINEL(obj, OBJ);
- BUG_ON(obj->pool == NULL);
- ASSERT_SENTINEL(obj->pool, POOL);
- objnode = (*tmem_hostops.objnode_alloc)(obj->pool);
- if (unlikely(objnode == NULL))
- goto out;
- objnode->obj = obj;
- SET_SENTINEL(objnode, OBJNODE);
- memset(&objnode->slots, 0, sizeof(objnode->slots));
- objnode->slots_in_use = 0;
- obj->objnode_count++;
-out:
- return objnode;
-}
-
-static void tmem_objnode_free(struct tmem_objnode *objnode)
-{
- struct tmem_pool *pool;
- int i;
-
- BUG_ON(objnode == NULL);
- for (i = 0; i < OBJNODE_TREE_MAP_SIZE; i++)
- BUG_ON(objnode->slots[i] != NULL);
- ASSERT_SENTINEL(objnode, OBJNODE);
- INVERT_SENTINEL(objnode, OBJNODE);
- BUG_ON(objnode->obj == NULL);
- ASSERT_SENTINEL(objnode->obj, OBJ);
- pool = objnode->obj->pool;
- BUG_ON(pool == NULL);
- ASSERT_SENTINEL(pool, POOL);
- objnode->obj->objnode_count--;
- objnode->obj = NULL;
- (*tmem_hostops.objnode_free)(objnode, pool);
-}
-
-/*
- * lookup index in object and return associated pampd (or NULL if not found)
- */
-static void **__tmem_pampd_lookup_in_obj(struct tmem_obj *obj, uint32_t index)
-{
- unsigned int height, shift;
- struct tmem_objnode **slot = NULL;
-
- BUG_ON(obj == NULL);
- ASSERT_SENTINEL(obj, OBJ);
- BUG_ON(obj->pool == NULL);
- ASSERT_SENTINEL(obj->pool, POOL);
-
- height = obj->objnode_tree_height;
- if (index > tmem_objnode_tree_h2max[obj->objnode_tree_height])
- goto out;
- if (height == 0 && obj->objnode_tree_root) {
- slot = &obj->objnode_tree_root;
- goto out;
- }
- shift = (height-1) * OBJNODE_TREE_MAP_SHIFT;
- slot = &obj->objnode_tree_root;
- while (height > 0) {
- if (*slot == NULL)
- goto out;
- slot = (struct tmem_objnode **)
- ((*slot)->slots +
- ((index >> shift) & OBJNODE_TREE_MAP_MASK));
- shift -= OBJNODE_TREE_MAP_SHIFT;
- height--;
- }
-out:
- return slot != NULL ? (void **)slot : NULL;
-}
-
-static void *tmem_pampd_lookup_in_obj(struct tmem_obj *obj, uint32_t index)
-{
- struct tmem_objnode **slot;
-
- slot = (struct tmem_objnode **)__tmem_pampd_lookup_in_obj(obj, index);
- return slot != NULL ? *slot : NULL;
-}
-
-static void *tmem_pampd_replace_in_obj(struct tmem_obj *obj, uint32_t index,
- void *new_pampd)
-{
- struct tmem_objnode **slot;
- void *ret = NULL;
-
- slot = (struct tmem_objnode **)__tmem_pampd_lookup_in_obj(obj, index);
- if ((slot != NULL) && (*slot != NULL)) {
- void *old_pampd = *(void **)slot;
- *(void **)slot = new_pampd;
- (*tmem_pamops.free)(old_pampd, obj->pool, NULL, 0);
- ret = new_pampd;
- }
- return ret;
-}
-
-static int tmem_pampd_add_to_obj(struct tmem_obj *obj, uint32_t index,
- void *pampd)
-{
- int ret = 0;
- struct tmem_objnode *objnode = NULL, *newnode, *slot;
- unsigned int height, shift;
- int offset = 0;
-
- /* if necessary, extend the tree to be higher */
- if (index > tmem_objnode_tree_h2max[obj->objnode_tree_height]) {
- height = obj->objnode_tree_height + 1;
- if (index > tmem_objnode_tree_h2max[height])
- while (index > tmem_objnode_tree_h2max[height])
- height++;
- if (obj->objnode_tree_root == NULL) {
- obj->objnode_tree_height = height;
- goto insert;
- }
- do {
- newnode = tmem_objnode_alloc(obj);
- if (!newnode) {
- ret = -ENOMEM;
- goto out;
- }
- newnode->slots[0] = obj->objnode_tree_root;
- newnode->slots_in_use = 1;
- obj->objnode_tree_root = newnode;
- obj->objnode_tree_height++;
- } while (height > obj->objnode_tree_height);
- }
-insert:
- slot = obj->objnode_tree_root;
- height = obj->objnode_tree_height;
- shift = (height-1) * OBJNODE_TREE_MAP_SHIFT;
- while (height > 0) {
- if (slot == NULL) {
- /* add a child objnode. */
- slot = tmem_objnode_alloc(obj);
- if (!slot) {
- ret = -ENOMEM;
- goto out;
- }
- if (objnode) {
-
- objnode->slots[offset] = slot;
- objnode->slots_in_use++;
- } else
- obj->objnode_tree_root = slot;
- }
- /* go down a level */
- offset = (index >> shift) & OBJNODE_TREE_MAP_MASK;
- objnode = slot;
- slot = objnode->slots[offset];
- shift -= OBJNODE_TREE_MAP_SHIFT;
- height--;
- }
- BUG_ON(slot != NULL);
- if (objnode) {
- objnode->slots_in_use++;
- objnode->slots[offset] = pampd;
- } else
- obj->objnode_tree_root = pampd;
- obj->pampd_count++;
-out:
- return ret;
-}
-
-static void *tmem_pampd_delete_from_obj(struct tmem_obj *obj, uint32_t index)
-{
- struct tmem_objnode_tree_path path[OBJNODE_TREE_MAX_PATH + 1];
- struct tmem_objnode_tree_path *pathp = path;
- struct tmem_objnode *slot = NULL;
- unsigned int height, shift;
- int offset;
-
- BUG_ON(obj == NULL);
- ASSERT_SENTINEL(obj, OBJ);
- BUG_ON(obj->pool == NULL);
- ASSERT_SENTINEL(obj->pool, POOL);
- height = obj->objnode_tree_height;
- if (index > tmem_objnode_tree_h2max[height])
- goto out;
- slot = obj->objnode_tree_root;
- if (height == 0 && obj->objnode_tree_root) {
- obj->objnode_tree_root = NULL;
- goto out;
- }
- shift = (height - 1) * OBJNODE_TREE_MAP_SHIFT;
- pathp->objnode = NULL;
- do {
- if (slot == NULL)
- goto out;
- pathp++;
- offset = (index >> shift) & OBJNODE_TREE_MAP_MASK;
- pathp->offset = offset;
- pathp->objnode = slot;
- slot = slot->slots[offset];
- shift -= OBJNODE_TREE_MAP_SHIFT;
- height--;
- } while (height > 0);
- if (slot == NULL)
- goto out;
- while (pathp->objnode) {
- pathp->objnode->slots[pathp->offset] = NULL;
- pathp->objnode->slots_in_use--;
- if (pathp->objnode->slots_in_use) {
- if (pathp->objnode == obj->objnode_tree_root) {
- while (obj->objnode_tree_height > 0 &&
- obj->objnode_tree_root->slots_in_use == 1 &&
- obj->objnode_tree_root->slots[0]) {
- struct tmem_objnode *to_free =
- obj->objnode_tree_root;
-
- obj->objnode_tree_root =
- to_free->slots[0];
- obj->objnode_tree_height--;
- to_free->slots[0] = NULL;
- to_free->slots_in_use = 0;
- tmem_objnode_free(to_free);
- }
- }
- goto out;
- }
- tmem_objnode_free(pathp->objnode); /* 0 slots used, free it */
- pathp--;
- }
- obj->objnode_tree_height = 0;
- obj->objnode_tree_root = NULL;
-
-out:
- if (slot != NULL)
- obj->pampd_count--;
- BUG_ON(obj->pampd_count < 0);
- return slot;
-}
-
-/* recursively walk the objnode_tree destroying pampds and objnodes */
-static void tmem_objnode_node_destroy(struct tmem_obj *obj,
- struct tmem_objnode *objnode,
- unsigned int ht)
-{
- int i;
-
- if (ht == 0)
- return;
- for (i = 0; i < OBJNODE_TREE_MAP_SIZE; i++) {
- if (objnode->slots[i]) {
- if (ht == 1) {
- obj->pampd_count--;
- (*tmem_pamops.free)(objnode->slots[i],
- obj->pool, NULL, 0);
- objnode->slots[i] = NULL;
- continue;
- }
- tmem_objnode_node_destroy(obj, objnode->slots[i], ht-1);
- tmem_objnode_free(objnode->slots[i]);
- objnode->slots[i] = NULL;
- }
- }
-}
-
-static void tmem_pampd_destroy_all_in_obj(struct tmem_obj *obj)
-{
- if (obj->objnode_tree_root == NULL)
- return;
- if (obj->objnode_tree_height == 0) {
- obj->pampd_count--;
- (*tmem_pamops.free)(obj->objnode_tree_root, obj->pool, NULL, 0);
- } else {
- tmem_objnode_node_destroy(obj, obj->objnode_tree_root,
- obj->objnode_tree_height);
- tmem_objnode_free(obj->objnode_tree_root);
- obj->objnode_tree_height = 0;
- }
- obj->objnode_tree_root = NULL;
- (*tmem_pamops.free_obj)(obj->pool, obj);
-}
-
-/*
- * Tmem is operated on by a set of well-defined actions:
- * "put", "get", "flush", "flush_object", "new pool" and "destroy pool".
- * (The tmem ABI allows for subpages and exchanges but these operations
- * are not included in this implementation.)
- *
- * These "tmem core" operations are implemented in the following functions.
- */
-
-/*
- * "Put" a page, e.g. copy a page from the kernel into newly allocated
- * PAM space (if such space is available). Tmem_put is complicated by
- * a corner case: What if a page with matching handle already exists in
- * tmem? To guarantee coherency, one of two actions is necessary: Either
- * the data for the page must be overwritten, or the page must be
- * "flushed" so that the data is not accessible to a subsequent "get".
- * Since these "duplicate puts" are relatively rare, this implementation
- * always flushes for simplicity.
- */
-int tmem_put(struct tmem_pool *pool, struct tmem_oid *oidp, uint32_t index,
- char *data, size_t size, bool raw, bool ephemeral)
-{
- struct tmem_obj *obj = NULL, *objfound = NULL, *objnew = NULL;
- void *pampd = NULL, *pampd_del = NULL;
- int ret = -ENOMEM;
- struct tmem_hashbucket *hb;
-
- hb = &pool->hashbucket[tmem_oid_hash(oidp)];
- spin_lock(&hb->lock);
- obj = objfound = tmem_obj_find(hb, oidp);
- if (obj != NULL) {
- pampd = tmem_pampd_lookup_in_obj(objfound, index);
- if (pampd != NULL) {
- /* if found, is a dup put, flush the old one */
- pampd_del = tmem_pampd_delete_from_obj(obj, index);
- BUG_ON(pampd_del != pampd);
- (*tmem_pamops.free)(pampd, pool, oidp, index);
- if (obj->pampd_count == 0) {
- objnew = obj;
- objfound = NULL;
- }
- pampd = NULL;
- }
- } else {
- obj = objnew = (*tmem_hostops.obj_alloc)(pool);
- if (unlikely(obj == NULL)) {
- ret = -ENOMEM;
- goto out;
- }
- tmem_obj_init(obj, hb, pool, oidp);
- }
- BUG_ON(obj == NULL);
- BUG_ON(((objnew != obj) && (objfound != obj)) || (objnew == objfound));
- pampd = (*tmem_pamops.create)(data, size, raw, ephemeral,
- obj->pool, &obj->oid, index);
- if (unlikely(pampd == NULL))
- goto free;
- ret = tmem_pampd_add_to_obj(obj, index, pampd);
- if (unlikely(ret == -ENOMEM))
- /* may have partially built objnode tree ("stump") */
- goto delete_and_free;
- goto out;
-
-delete_and_free:
- (void)tmem_pampd_delete_from_obj(obj, index);
-free:
- if (pampd)
- (*tmem_pamops.free)(pampd, pool, NULL, 0);
- if (objnew) {
- tmem_obj_free(objnew, hb);
- (*tmem_hostops.obj_free)(objnew, pool);
- }
-out:
- spin_unlock(&hb->lock);
- return ret;
-}
-
-/*
- * "Get" a page, e.g. if one can be found, copy the tmem page with the
- * matching handle from PAM space to the kernel. By tmem definition,
- * when a "get" is successful on an ephemeral page, the page is "flushed",
- * and when a "get" is successful on a persistent page, the page is retained
- * in tmem. Note that to preserve
- * coherency, "get" can never be skipped if tmem contains the data.
- * That is, if a get is done with a certain handle and fails, any
- * subsequent "get" must also fail (unless of course there is a
- * "put" done with the same handle).
-
- */
-int tmem_get(struct tmem_pool *pool, struct tmem_oid *oidp, uint32_t index,
- char *data, size_t *size, bool raw, int get_and_free)
-{
- struct tmem_obj *obj;
- void *pampd;
- bool ephemeral = is_ephemeral(pool);
- int ret = -1;
- struct tmem_hashbucket *hb;
- bool free = (get_and_free == 1) || ((get_and_free == 0) && ephemeral);
- bool lock_held = false;
-
- hb = &pool->hashbucket[tmem_oid_hash(oidp)];
- spin_lock(&hb->lock);
- lock_held = true;
- obj = tmem_obj_find(hb, oidp);
- if (obj == NULL)
- goto out;
- if (free)
- pampd = tmem_pampd_delete_from_obj(obj, index);
- else
- pampd = tmem_pampd_lookup_in_obj(obj, index);
- if (pampd == NULL)
- goto out;
- if (free) {
- if (obj->pampd_count == 0) {
- tmem_obj_free(obj, hb);
- (*tmem_hostops.obj_free)(obj, pool);
- obj = NULL;
- }
- }
- if (tmem_pamops.is_remote(pampd)) {
- lock_held = false;
- spin_unlock(&hb->lock);
- }
- if (free)
- ret = (*tmem_pamops.get_data_and_free)(
- data, size, raw, pampd, pool, oidp, index);
- else
- ret = (*tmem_pamops.get_data)(
- data, size, raw, pampd, pool, oidp, index);
- if (ret < 0)
- goto out;
- ret = 0;
-out:
- if (lock_held)
- spin_unlock(&hb->lock);
- return ret;
-}
-
-/*
- * If a page in tmem matches the handle, "flush" this page from tmem such
- * that any subsequent "get" does not succeed (unless, of course, there
- * was another "put" with the same handle).
- */
-int tmem_flush_page(struct tmem_pool *pool,
- struct tmem_oid *oidp, uint32_t index)
-{
- struct tmem_obj *obj;
- void *pampd;
- int ret = -1;
- struct tmem_hashbucket *hb;
-
- hb = &pool->hashbucket[tmem_oid_hash(oidp)];
- spin_lock(&hb->lock);
- obj = tmem_obj_find(hb, oidp);
- if (obj == NULL)
- goto out;
- pampd = tmem_pampd_delete_from_obj(obj, index);
- if (pampd == NULL)
- goto out;
- (*tmem_pamops.free)(pampd, pool, oidp, index);
- if (obj->pampd_count == 0) {
- tmem_obj_free(obj, hb);
- (*tmem_hostops.obj_free)(obj, pool);
- }
- ret = 0;
-
-out:
- spin_unlock(&hb->lock);
- return ret;
-}
-
-/*
- * If a page in tmem matches the handle, replace the page so that any
- * subsequent "get" gets the new page. Returns 0 if
- * there was a page to replace, else returns -1.
- */
-int tmem_replace(struct tmem_pool *pool, struct tmem_oid *oidp,
- uint32_t index, void *new_pampd)
-{
- struct tmem_obj *obj;
- int ret = -1;
- struct tmem_hashbucket *hb;
-
- hb = &pool->hashbucket[tmem_oid_hash(oidp)];
- spin_lock(&hb->lock);
- obj = tmem_obj_find(hb, oidp);
- if (obj == NULL)
- goto out;
- new_pampd = tmem_pampd_replace_in_obj(obj, index, new_pampd);
- ret = (*tmem_pamops.replace_in_obj)(new_pampd, obj);
-out:
- spin_unlock(&hb->lock);
- return ret;
-}
-
-/*
- * "Flush" all pages in tmem matching this oid.
- */
-int tmem_flush_object(struct tmem_pool *pool, struct tmem_oid *oidp)
-{
- struct tmem_obj *obj;
- struct tmem_hashbucket *hb;
- int ret = -1;
-
- hb = &pool->hashbucket[tmem_oid_hash(oidp)];
- spin_lock(&hb->lock);
- obj = tmem_obj_find(hb, oidp);
- if (obj == NULL)
- goto out;
- tmem_pampd_destroy_all_in_obj(obj);
- tmem_obj_free(obj, hb);
- (*tmem_hostops.obj_free)(obj, pool);
- ret = 0;
-
-out:
- spin_unlock(&hb->lock);
- return ret;
-}
-
-/*
- * "Flush" all pages (and tmem_objs) from this tmem_pool and disable
- * all subsequent access to this tmem_pool.
- */
-int tmem_destroy_pool(struct tmem_pool *pool)
-{
- int ret = -1;
-
- if (pool == NULL)
- goto out;
- tmem_pool_flush(pool, 1);
- ret = 0;
-out:
- return ret;
-}
-
-static LIST_HEAD(tmem_global_pool_list);
-
-/*
- * Create a new tmem_pool with the provided flag and return
- * a pool id provided by the tmem host implementation.
- */
-void tmem_new_pool(struct tmem_pool *pool, uint32_t flags)
-{
- int persistent = flags & TMEM_POOL_PERSIST;
- int shared = flags & TMEM_POOL_SHARED;
- struct tmem_hashbucket *hb = &pool->hashbucket[0];
- int i;
-
- for (i = 0; i < TMEM_HASH_BUCKETS; i++, hb++) {
- hb->obj_rb_root = RB_ROOT;
- spin_lock_init(&hb->lock);
- }
- INIT_LIST_HEAD(&pool->pool_list);
- atomic_set(&pool->obj_count, 0);
- SET_SENTINEL(pool, POOL);
- list_add_tail(&pool->pool_list, &tmem_global_pool_list);
- pool->persistent = persistent;
- pool->shared = shared;
-}
diff --git a/drivers/staging/zcache/tmem.h b/drivers/staging/zcache/tmem.h
deleted file mode 100644
index 0d4aa82..0000000
--- a/drivers/staging/zcache/tmem.h
+++ /dev/null
@@ -1,206 +0,0 @@
-/*
- * tmem.h
- *
- * Transcendent memory
- *
- * Copyright (c) 2009-2011, Dan Magenheimer, Oracle Corp.
- */
-
-#ifndef _TMEM_H_
-#define _TMEM_H_
-
-#include <linux/types.h>
-#include <linux/highmem.h>
-#include <linux/hash.h>
-#include <linux/atomic.h>
-
-/*
- * These are pre-defined by the Xen<->Linux ABI
- */
-#define TMEM_PUT_PAGE 4
-#define TMEM_GET_PAGE 5
-#define TMEM_FLUSH_PAGE 6
-#define TMEM_FLUSH_OBJECT 7
-#define TMEM_POOL_PERSIST 1
-#define TMEM_POOL_SHARED 2
-#define TMEM_POOL_PRECOMPRESSED 4
-#define TMEM_POOL_PAGESIZE_SHIFT 4
-#define TMEM_POOL_PAGESIZE_MASK 0xf
-#define TMEM_POOL_RESERVED_BITS 0x00ffff00
-
-/*
- * sentinels have proven very useful for debugging but can be removed
- * or disabled before final merge.
- */
-#define SENTINELS
-#ifdef SENTINELS
-#define DECL_SENTINEL uint32_t sentinel;
-#define SET_SENTINEL(_x, _y) (_x->sentinel = _y##_SENTINEL)
-#define INVERT_SENTINEL(_x, _y) (_x->sentinel = ~_y##_SENTINEL)
-#define ASSERT_SENTINEL(_x, _y) WARN_ON(_x->sentinel != _y##_SENTINEL)
-#define ASSERT_INVERTED_SENTINEL(_x, _y) WARN_ON(_x->sentinel != ~_y##_SENTINEL)
-#else
-#define DECL_SENTINEL
-#define SET_SENTINEL(_x, _y) do { } while (0)
-#define INVERT_SENTINEL(_x, _y) do { } while (0)
-#define ASSERT_SENTINEL(_x, _y) do { } while (0)
-#define ASSERT_INVERTED_SENTINEL(_x, _y) do { } while (0)
-#endif
-
-#define ASSERT_SPINLOCK(_l) lockdep_assert_held(_l)
-
-/*
- * A pool is the highest-level data structure managed by tmem and
- * usually corresponds to a large independent set of pages such as
- * a filesystem. Each pool has an id, and certain attributes and counters.
- * It also contains a set of hash buckets, each of which contains an rbtree
- * of objects and a lock to manage concurrency within the pool.
- */
-
-#define TMEM_HASH_BUCKET_BITS 8
-#define TMEM_HASH_BUCKETS (1<<TMEM_HASH_BUCKET_BITS)
-
-struct tmem_hashbucket {
- struct rb_root obj_rb_root;
- spinlock_t lock;
-};
-
-struct tmem_pool {
- void *client; /* "up" for some clients, avoids table lookup */
- struct list_head pool_list;
- uint32_t pool_id;
- bool persistent;
- bool shared;
- atomic_t obj_count;
- atomic_t refcount;
- struct tmem_hashbucket hashbucket[TMEM_HASH_BUCKETS];
- DECL_SENTINEL
-};
-
-#define is_persistent(_p) (_p->persistent)
-#define is_ephemeral(_p) (!(_p->persistent))
-
-/*
- * An object id ("oid") is large: 192-bits (to ensure, for example, files
- * in a modern filesystem can be uniquely identified).
- */
-
-struct tmem_oid {
- uint64_t oid[3];
-};
-
-static inline void tmem_oid_set_invalid(struct tmem_oid *oidp)
-{
- oidp->oid[0] = oidp->oid[1] = oidp->oid[2] = -1UL;
-}
-
-static inline bool tmem_oid_valid(struct tmem_oid *oidp)
-{
- return oidp->oid[0] != -1UL || oidp->oid[1] != -1UL ||
- oidp->oid[2] != -1UL;
-}
-
-static inline int tmem_oid_compare(struct tmem_oid *left,
- struct tmem_oid *right)
-{
- int ret;
-
- if (left->oid[2] == right->oid[2]) {
- if (left->oid[1] == right->oid[1]) {
- if (left->oid[0] == right->oid[0])
- ret = 0;
- else if (left->oid[0] < right->oid[0])
- ret = -1;
- else
- return 1;
- } else if (left->oid[1] < right->oid[1])
- ret = -1;
- else
- ret = 1;
- } else if (left->oid[2] < right->oid[2])
- ret = -1;
- else
- ret = 1;
- return ret;
-}
-
-static inline unsigned tmem_oid_hash(struct tmem_oid *oidp)
-{
- return hash_long(oidp->oid[0] ^ oidp->oid[1] ^ oidp->oid[2],
- TMEM_HASH_BUCKET_BITS);
-}
-
-/*
- * A tmem_obj contains an identifier (oid), pointers to the parent
- * pool and the rb_tree to which it belongs, counters, and an ordered
- * set of pampds, structured in a radix-tree-like tree. The intermediate
- * nodes of the tree are called tmem_objnodes.
- */
-
-struct tmem_objnode;
-
-struct tmem_obj {
- struct tmem_oid oid;
- struct tmem_pool *pool;
- struct rb_node rb_tree_node;
- struct tmem_objnode *objnode_tree_root;
- unsigned int objnode_tree_height;
- unsigned long objnode_count;
- long pampd_count;
- void *extra; /* for private use by pampd implementation */
- DECL_SENTINEL
-};
-
-#define OBJNODE_TREE_MAP_SHIFT 6
-#define OBJNODE_TREE_MAP_SIZE (1UL << OBJNODE_TREE_MAP_SHIFT)
-#define OBJNODE_TREE_MAP_MASK (OBJNODE_TREE_MAP_SIZE-1)
-#define OBJNODE_TREE_INDEX_BITS (8 /* CHAR_BIT */ * sizeof(unsigned long))
-#define OBJNODE_TREE_MAX_PATH \
- (OBJNODE_TREE_INDEX_BITS/OBJNODE_TREE_MAP_SHIFT + 2)
-
-struct tmem_objnode {
- struct tmem_obj *obj;
- DECL_SENTINEL
- void *slots[OBJNODE_TREE_MAP_SIZE];
- unsigned int slots_in_use;
-};
-
-/* pampd abstract datatype methods provided by the PAM implementation */
-struct tmem_pamops {
- void *(*create)(char *, size_t, bool, int,
- struct tmem_pool *, struct tmem_oid *, uint32_t);
- int (*get_data)(char *, size_t *, bool, void *, struct tmem_pool *,
- struct tmem_oid *, uint32_t);
- int (*get_data_and_free)(char *, size_t *, bool, void *,
- struct tmem_pool *, struct tmem_oid *,
- uint32_t);
- void (*free)(void *, struct tmem_pool *, struct tmem_oid *, uint32_t);
- void (*free_obj)(struct tmem_pool *, struct tmem_obj *);
- bool (*is_remote)(void *);
- void (*new_obj)(struct tmem_obj *);
- int (*replace_in_obj)(void *, struct tmem_obj *);
-};
-extern void tmem_register_pamops(struct tmem_pamops *m);
-
-/* memory allocation methods provided by the host implementation */
-struct tmem_hostops {
- struct tmem_obj *(*obj_alloc)(struct tmem_pool *);
- void (*obj_free)(struct tmem_obj *, struct tmem_pool *);
- struct tmem_objnode *(*objnode_alloc)(struct tmem_pool *);
- void (*objnode_free)(struct tmem_objnode *, struct tmem_pool *);
-};
-extern void tmem_register_hostops(struct tmem_hostops *m);
-
-/* core tmem accessor functions */
-extern int tmem_put(struct tmem_pool *, struct tmem_oid *, uint32_t index,
- char *, size_t, bool, bool);
-extern int tmem_get(struct tmem_pool *, struct tmem_oid *, uint32_t index,
- char *, size_t *, bool, int);
-extern int tmem_replace(struct tmem_pool *, struct tmem_oid *, uint32_t index,
- void *);
-extern int tmem_flush_page(struct tmem_pool *, struct tmem_oid *,
- uint32_t index);
-extern int tmem_flush_object(struct tmem_pool *, struct tmem_oid *);
-extern int tmem_destroy_pool(struct tmem_pool *);
-extern void tmem_new_pool(struct tmem_pool *, uint32_t);
-#endif /* _TMEM_H */
diff --git a/drivers/staging/zcache/zcache-main.c b/drivers/staging/zcache/zcache-main.c
deleted file mode 100644
index 784c796..0000000
--- a/drivers/staging/zcache/zcache-main.c
+++ /dev/null
@@ -1,2084 +0,0 @@
-/*
- * zcache.c
- *
- * Copyright (c) 2010,2011, Dan Magenheimer, Oracle Corp.
- * Copyright (c) 2010,2011, Nitin Gupta
- *
- * Zcache provides an in-kernel "host implementation" for transcendent memory
- * and, thus indirectly, for cleancache and frontswap. Zcache includes two
- * page-accessible memory [1] interfaces, both utilizing the crypto compression
- * API:
- * 1) "compression buddies" ("zbud") is used for ephemeral pages
- * 2) zsmalloc is used for persistent pages.
- * Xvmalloc (based on the TLSF allocator) has very low fragmentation
- * so maximizes space efficiency, while zbud allows pairs (and potentially,
- * in the future, more than a pair of) compressed pages to be closely linked
- * so that reclaiming can be done via the kernel's physical-page-oriented
- * "shrinker" interface.
- *
- * [1] For a definition of page-accessible memory (aka PAM), see:
- * http://marc.info/?l=linux-mm&m=127811271605009
- */
-
-#include <linux/module.h>
-#include <linux/cpu.h>
-#include <linux/highmem.h>
-#include <linux/list.h>
-#include <linux/slab.h>
-#include <linux/spinlock.h>
-#include <linux/types.h>
-#include <linux/atomic.h>
-#include <linux/math64.h>
-#include <linux/crypto.h>
-#include <linux/string.h>
-#include "tmem.h"
-
-#include "../zsmalloc/zsmalloc.h"
-
-#if (!defined(CONFIG_CLEANCACHE) && !defined(CONFIG_FRONTSWAP))
-#error "zcache is useless without CONFIG_CLEANCACHE or CONFIG_FRONTSWAP"
-#endif
-#ifdef CONFIG_CLEANCACHE
-#include <linux/cleancache.h>
-#endif
-#ifdef CONFIG_FRONTSWAP
-#include <linux/frontswap.h>
-#endif
-
-#if 0
-/* this is more aggressive but may cause other problems? */
-#define ZCACHE_GFP_MASK (GFP_ATOMIC | __GFP_NORETRY | __GFP_NOWARN)
-#else
-#define ZCACHE_GFP_MASK \
- (__GFP_FS | __GFP_NORETRY | __GFP_NOWARN | __GFP_NOMEMALLOC)
-#endif
-
-#define MAX_POOLS_PER_CLIENT 16
-
-#define MAX_CLIENTS 16
-#define LOCAL_CLIENT ((uint16_t)-1)
-
-MODULE_LICENSE("GPL");
-
-struct zcache_client {
- struct tmem_pool *tmem_pools[MAX_POOLS_PER_CLIENT];
- struct zs_pool *zspool;
- bool allocated;
- atomic_t refcount;
-};
-
-static struct zcache_client zcache_host;
-static struct zcache_client zcache_clients[MAX_CLIENTS];
-
-static inline uint16_t get_client_id_from_client(struct zcache_client *cli)
-{
- BUG_ON(cli == NULL);
- if (cli == &zcache_host)
- return LOCAL_CLIENT;
- return cli - &zcache_clients[0];
-}
-
-static inline bool is_local_client(struct zcache_client *cli)
-{
- return cli == &zcache_host;
-}
-
-/* crypto API for zcache */
-#define ZCACHE_COMP_NAME_SZ CRYPTO_MAX_ALG_NAME
-static char zcache_comp_name[ZCACHE_COMP_NAME_SZ];
-static struct crypto_comp * __percpu *zcache_comp_pcpu_tfms;
-
-enum comp_op {
- ZCACHE_COMPOP_COMPRESS,
- ZCACHE_COMPOP_DECOMPRESS
-};
-
-static inline int zcache_comp_op(enum comp_op op,
- const u8 *src, unsigned int slen,
- u8 *dst, unsigned int *dlen)
-{
- struct crypto_comp *tfm;
- int ret;
-
- BUG_ON(!zcache_comp_pcpu_tfms);
- tfm = *per_cpu_ptr(zcache_comp_pcpu_tfms, get_cpu());
- BUG_ON(!tfm);
- switch (op) {
- case ZCACHE_COMPOP_COMPRESS:
- ret = crypto_comp_compress(tfm, src, slen, dst, dlen);
- break;
- case ZCACHE_COMPOP_DECOMPRESS:
- ret = crypto_comp_decompress(tfm, src, slen, dst, dlen);
- break;
- }
- put_cpu();
- return ret;
-}
-
-/**********
- * Compression buddies ("zbud") provides for packing two (or, possibly
- * in the future, more) compressed ephemeral pages into a single "raw"
- * (physical) page and tracking them with data structures so that
- * the raw pages can be easily reclaimed.
- *
- * A zbud page ("zbpg") is an aligned page containing a list_head,
- * a lock, and two "zbud headers". The remainder of the physical
- * page is divided up into aligned 64-byte "chunks" which contain
- * the compressed data for zero, one, or two zbuds. Each zbpg
- * resides on: (1) an "unused list" if it has no zbuds; (2) a
- * "buddied" list if it is fully populated with two zbuds; or
- * (3) one of PAGE_SIZE/64 "unbuddied" lists indexed by how many chunks
- * the one unbuddied zbud uses. The data inside a zbpg cannot be
- * read or written unless the zbpg's lock is held.
- */
-
-#define ZBH_SENTINEL 0x43214321
-#define ZBPG_SENTINEL 0xdeadbeef
-
-#define ZBUD_MAX_BUDS 2
-
-struct zbud_hdr {
- uint16_t client_id;
- uint16_t pool_id;
- struct tmem_oid oid;
- uint32_t index;
- uint16_t size; /* compressed size in bytes, zero means unused */
- DECL_SENTINEL
-};
-
-struct zbud_page {
- struct list_head bud_list;
- spinlock_t lock;
- struct zbud_hdr buddy[ZBUD_MAX_BUDS];
- DECL_SENTINEL
- /* followed by NUM_CHUNK aligned CHUNK_SIZE-byte chunks */
-};
-
-#define CHUNK_SHIFT 6
-#define CHUNK_SIZE (1 << CHUNK_SHIFT)
-#define CHUNK_MASK (~(CHUNK_SIZE-1))
-#define NCHUNKS (((PAGE_SIZE - sizeof(struct zbud_page)) & \
- CHUNK_MASK) >> CHUNK_SHIFT)
-#define MAX_CHUNK (NCHUNKS-1)
-
-static struct {
- struct list_head list;
- unsigned count;
-} zbud_unbuddied[NCHUNKS];
-/* list N contains pages with N chunks USED and NCHUNKS-N unused */
-/* element 0 is never used but optimizing that isn't worth it */
-static unsigned long zbud_cumul_chunk_counts[NCHUNKS];
-
-struct list_head zbud_buddied_list;
-static unsigned long zcache_zbud_buddied_count;
-
-/* protects the buddied list and all unbuddied lists */
-static DEFINE_SPINLOCK(zbud_budlists_spinlock);
-
-static LIST_HEAD(zbpg_unused_list);
-static unsigned long zcache_zbpg_unused_list_count;
-
-/* protects the unused page list */
-static DEFINE_SPINLOCK(zbpg_unused_list_spinlock);
-
-static atomic_t zcache_zbud_curr_raw_pages;
-static atomic_t zcache_zbud_curr_zpages;
-static unsigned long zcache_zbud_curr_zbytes;
-static unsigned long zcache_zbud_cumul_zpages;
-static unsigned long zcache_zbud_cumul_zbytes;
-static unsigned long zcache_compress_poor;
-static unsigned long zcache_mean_compress_poor;
-
-/* forward references */
-static void *zcache_get_free_page(void);
-static void zcache_free_page(void *p);
-
-/*
- * zbud helper functions
- */
-
-static inline unsigned zbud_max_buddy_size(void)
-{
- return MAX_CHUNK << CHUNK_SHIFT;
-}
-
-static inline unsigned zbud_size_to_chunks(unsigned size)
-{
- BUG_ON(size == 0 || size > zbud_max_buddy_size());
- return (size + CHUNK_SIZE - 1) >> CHUNK_SHIFT;
-}
-
-static inline int zbud_budnum(struct zbud_hdr *zh)
-{
- unsigned offset = (unsigned long)zh & (PAGE_SIZE - 1);
- struct zbud_page *zbpg = NULL;
- unsigned budnum = -1U;
- int i;
-
- for (i = 0; i < ZBUD_MAX_BUDS; i++)
- if (offset == offsetof(typeof(*zbpg), buddy[i])) {
- budnum = i;
- break;
- }
- BUG_ON(budnum == -1U);
- return budnum;
-}
-
-static char *zbud_data(struct zbud_hdr *zh, unsigned size)
-{
- struct zbud_page *zbpg;
- char *p;
- unsigned budnum;
-
- ASSERT_SENTINEL(zh, ZBH);
- budnum = zbud_budnum(zh);
- BUG_ON(size == 0 || size > zbud_max_buddy_size());
- zbpg = container_of(zh, struct zbud_page, buddy[budnum]);
- ASSERT_SPINLOCK(&zbpg->lock);
- p = (char *)zbpg;
- if (budnum == 0)
- p += ((sizeof(struct zbud_page) + CHUNK_SIZE - 1) &
- CHUNK_MASK);
- else if (budnum == 1)
- p += PAGE_SIZE - ((size + CHUNK_SIZE - 1) & CHUNK_MASK);
- return p;
-}
-
-/*
- * zbud raw page management
- */
-
-static struct zbud_page *zbud_alloc_raw_page(void)
-{
- struct zbud_page *zbpg = NULL;
- struct zbud_hdr *zh0, *zh1;
- bool recycled = 0;
-
- /* if any pages on the zbpg list, use one */
- spin_lock(&zbpg_unused_list_spinlock);
- if (!list_empty(&zbpg_unused_list)) {
- zbpg = list_first_entry(&zbpg_unused_list,
- struct zbud_page, bud_list);
- list_del_init(&zbpg->bud_list);
- zcache_zbpg_unused_list_count--;
- recycled = 1;
- }
- spin_unlock(&zbpg_unused_list_spinlock);
- if (zbpg == NULL)
- /* none on zbpg list, try to get a kernel page */
- zbpg = zcache_get_free_page();
- if (likely(zbpg != NULL)) {
- INIT_LIST_HEAD(&zbpg->bud_list);
- zh0 = &zbpg->buddy[0]; zh1 = &zbpg->buddy[1];
- spin_lock_init(&zbpg->lock);
- if (recycled) {
- ASSERT_INVERTED_SENTINEL(zbpg, ZBPG);
- SET_SENTINEL(zbpg, ZBPG);
- BUG_ON(zh0->size != 0 || tmem_oid_valid(&zh0->oid));
- BUG_ON(zh1->size != 0 || tmem_oid_valid(&zh1->oid));
- } else {
- atomic_inc(&zcache_zbud_curr_raw_pages);
- INIT_LIST_HEAD(&zbpg->bud_list);
- SET_SENTINEL(zbpg, ZBPG);
- zh0->size = 0; zh1->size = 0;
- tmem_oid_set_invalid(&zh0->oid);
- tmem_oid_set_invalid(&zh1->oid);
- }
- }
- return zbpg;
-}
-
-static void zbud_free_raw_page(struct zbud_page *zbpg)
-{
- struct zbud_hdr *zh0 = &zbpg->buddy[0], *zh1 = &zbpg->buddy[1];
-
- ASSERT_SENTINEL(zbpg, ZBPG);
- BUG_ON(!list_empty(&zbpg->bud_list));
- ASSERT_SPINLOCK(&zbpg->lock);
- BUG_ON(zh0->size != 0 || tmem_oid_valid(&zh0->oid));
- BUG_ON(zh1->size != 0 || tmem_oid_valid(&zh1->oid));
- INVERT_SENTINEL(zbpg, ZBPG);
- spin_unlock(&zbpg->lock);
- spin_lock(&zbpg_unused_list_spinlock);
- list_add(&zbpg->bud_list, &zbpg_unused_list);
- zcache_zbpg_unused_list_count++;
- spin_unlock(&zbpg_unused_list_spinlock);
-}
-
-/*
- * core zbud handling routines
- */
-
-static unsigned zbud_free(struct zbud_hdr *zh)
-{
- unsigned size;
-
- ASSERT_SENTINEL(zh, ZBH);
- BUG_ON(!tmem_oid_valid(&zh->oid));
- size = zh->size;
- BUG_ON(zh->size == 0 || zh->size > zbud_max_buddy_size());
- zh->size = 0;
- tmem_oid_set_invalid(&zh->oid);
- INVERT_SENTINEL(zh, ZBH);
- zcache_zbud_curr_zbytes -= size;
- atomic_dec(&zcache_zbud_curr_zpages);
- return size;
-}
-
-static void zbud_free_and_delist(struct zbud_hdr *zh)
-{
- unsigned chunks;
- struct zbud_hdr *zh_other;
- unsigned budnum = zbud_budnum(zh), size;
- struct zbud_page *zbpg =
- container_of(zh, struct zbud_page, buddy[budnum]);
-
- spin_lock(&zbud_budlists_spinlock);
- spin_lock(&zbpg->lock);
- if (list_empty(&zbpg->bud_list)) {
- /* ignore zombie page... see zbud_evict_pages() */
- spin_unlock(&zbpg->lock);
- spin_unlock(&zbud_budlists_spinlock);
- return;
- }
- size = zbud_free(zh);
- ASSERT_SPINLOCK(&zbpg->lock);
- zh_other = &zbpg->buddy[(budnum == 0) ? 1 : 0];
- if (zh_other->size == 0) { /* was unbuddied: unlist and free */
- chunks = zbud_size_to_chunks(size) ;
- BUG_ON(list_empty(&zbud_unbuddied[chunks].list));
- list_del_init(&zbpg->bud_list);
- zbud_unbuddied[chunks].count--;
- spin_unlock(&zbud_budlists_spinlock);
- zbud_free_raw_page(zbpg);
- } else { /* was buddied: move remaining buddy to unbuddied list */
- chunks = zbud_size_to_chunks(zh_other->size) ;
- list_del_init(&zbpg->bud_list);
- zcache_zbud_buddied_count--;
- list_add_tail(&zbpg->bud_list, &zbud_unbuddied[chunks].list);
- zbud_unbuddied[chunks].count++;
- spin_unlock(&zbud_budlists_spinlock);
- spin_unlock(&zbpg->lock);
- }
-}
-
-static struct zbud_hdr *zbud_create(uint16_t client_id, uint16_t pool_id,
- struct tmem_oid *oid,
- uint32_t index, struct page *page,
- void *cdata, unsigned size)
-{
- struct zbud_hdr *zh0, *zh1, *zh = NULL;
- struct zbud_page *zbpg = NULL, *ztmp;
- unsigned nchunks;
- char *to;
- int i, found_good_buddy = 0;
-
- nchunks = zbud_size_to_chunks(size) ;
- for (i = MAX_CHUNK - nchunks + 1; i > 0; i--) {
- spin_lock(&zbud_budlists_spinlock);
- if (!list_empty(&zbud_unbuddied[i].list)) {
- list_for_each_entry_safe(zbpg, ztmp,
- &zbud_unbuddied[i].list, bud_list) {
- if (spin_trylock(&zbpg->lock)) {
- found_good_buddy = i;
- goto found_unbuddied;
- }
- }
- }
- spin_unlock(&zbud_budlists_spinlock);
- }
- /* didn't find a good buddy, try allocating a new page */
- zbpg = zbud_alloc_raw_page();
- if (unlikely(zbpg == NULL))
- goto out;
- /* ok, have a page, now compress the data before taking locks */
- spin_lock(&zbud_budlists_spinlock);
- spin_lock(&zbpg->lock);
- list_add_tail(&zbpg->bud_list, &zbud_unbuddied[nchunks].list);
- zbud_unbuddied[nchunks].count++;
- zh = &zbpg->buddy[0];
- goto init_zh;
-
-found_unbuddied:
- ASSERT_SPINLOCK(&zbpg->lock);
- zh0 = &zbpg->buddy[0]; zh1 = &zbpg->buddy[1];
- BUG_ON(!((zh0->size == 0) ^ (zh1->size == 0)));
- if (zh0->size != 0) { /* buddy0 in use, buddy1 is vacant */
- ASSERT_SENTINEL(zh0, ZBH);
- zh = zh1;
- } else if (zh1->size != 0) { /* buddy1 in use, buddy0 is vacant */
- ASSERT_SENTINEL(zh1, ZBH);
- zh = zh0;
- } else
- BUG();
- list_del_init(&zbpg->bud_list);
- zbud_unbuddied[found_good_buddy].count--;
- list_add_tail(&zbpg->bud_list, &zbud_buddied_list);
- zcache_zbud_buddied_count++;
-
-init_zh:
- SET_SENTINEL(zh, ZBH);
- zh->size = size;
- zh->index = index;
- zh->oid = *oid;
- zh->pool_id = pool_id;
- zh->client_id = client_id;
- to = zbud_data(zh, size);
- memcpy(to, cdata, size);
- spin_unlock(&zbpg->lock);
- spin_unlock(&zbud_budlists_spinlock);
-
- zbud_cumul_chunk_counts[nchunks]++;
- atomic_inc(&zcache_zbud_curr_zpages);
- zcache_zbud_cumul_zpages++;
- zcache_zbud_curr_zbytes += size;
- zcache_zbud_cumul_zbytes += size;
-out:
- return zh;
-}
-
-static int zbud_decompress(struct page *page, struct zbud_hdr *zh)
-{
- struct zbud_page *zbpg;
- unsigned budnum = zbud_budnum(zh);
- unsigned int out_len = PAGE_SIZE;
- char *to_va, *from_va;
- unsigned size;
- int ret = 0;
-
- zbpg = container_of(zh, struct zbud_page, buddy[budnum]);
- spin_lock(&zbpg->lock);
- if (list_empty(&zbpg->bud_list)) {
- /* ignore zombie page... see zbud_evict_pages() */
- ret = -EINVAL;
- goto out;
- }
- ASSERT_SENTINEL(zh, ZBH);
- BUG_ON(zh->size == 0 || zh->size > zbud_max_buddy_size());
- to_va = kmap_atomic(page);
- size = zh->size;
- from_va = zbud_data(zh, size);
- ret = zcache_comp_op(ZCACHE_COMPOP_DECOMPRESS, from_va, size,
- to_va, &out_len);
- BUG_ON(ret);
- BUG_ON(out_len != PAGE_SIZE);
- kunmap_atomic(to_va);
-out:
- spin_unlock(&zbpg->lock);
- return ret;
-}
-
-/*
- * The following routines handle shrinking of ephemeral pages by evicting
- * pages "least valuable" first.
- */
-
-static unsigned long zcache_evicted_raw_pages;
-static unsigned long zcache_evicted_buddied_pages;
-static unsigned long zcache_evicted_unbuddied_pages;
-
-static struct tmem_pool *zcache_get_pool_by_id(uint16_t cli_id,
- uint16_t poolid);
-static void zcache_put_pool(struct tmem_pool *pool);
-
-/*
- * Flush and free all zbuds in a zbpg, then free the pageframe
- */
-static void zbud_evict_zbpg(struct zbud_page *zbpg)
-{
- struct zbud_hdr *zh;
- int i, j;
- uint32_t pool_id[ZBUD_MAX_BUDS], client_id[ZBUD_MAX_BUDS];
- uint32_t index[ZBUD_MAX_BUDS];
- struct tmem_oid oid[ZBUD_MAX_BUDS];
- struct tmem_pool *pool;
-
- ASSERT_SPINLOCK(&zbpg->lock);
- BUG_ON(!list_empty(&zbpg->bud_list));
- for (i = 0, j = 0; i < ZBUD_MAX_BUDS; i++) {
- zh = &zbpg->buddy[i];
- if (zh->size) {
- client_id[j] = zh->client_id;
- pool_id[j] = zh->pool_id;
- oid[j] = zh->oid;
- index[j] = zh->index;
- j++;
- zbud_free(zh);
- }
- }
- spin_unlock(&zbpg->lock);
- for (i = 0; i < j; i++) {
- pool = zcache_get_pool_by_id(client_id[i], pool_id[i]);
- if (pool != NULL) {
- tmem_flush_page(pool, &oid[i], index[i]);
- zcache_put_pool(pool);
- }
- }
- ASSERT_SENTINEL(zbpg, ZBPG);
- spin_lock(&zbpg->lock);
- zbud_free_raw_page(zbpg);
-}
-
-/*
- * Free nr pages. This code is funky because we want to hold the locks
- * protecting various lists for as short a time as possible, and in some
- * circumstances the list may change asynchronously when the list lock is
- * not held. In some cases we also trylock not only to avoid waiting on a
- * page in use by another cpu, but also to avoid potential deadlock due to
- * lock inversion.
- */
-static void zbud_evict_pages(int nr)
-{
- struct zbud_page *zbpg;
- int i;
-
- /* first try freeing any pages on unused list */
-retry_unused_list:
- spin_lock_bh(&zbpg_unused_list_spinlock);
- if (!list_empty(&zbpg_unused_list)) {
- /* can't walk list here, since it may change when unlocked */
- zbpg = list_first_entry(&zbpg_unused_list,
- struct zbud_page, bud_list);
- list_del_init(&zbpg->bud_list);
- zcache_zbpg_unused_list_count--;
- atomic_dec(&zcache_zbud_curr_raw_pages);
- spin_unlock_bh(&zbpg_unused_list_spinlock);
- zcache_free_page(zbpg);
- zcache_evicted_raw_pages++;
- if (--nr <= 0)
- goto out;
- goto retry_unused_list;
- }
- spin_unlock_bh(&zbpg_unused_list_spinlock);
-
- /* now try freeing unbuddied pages, starting with least space avail */
- for (i = 0; i < MAX_CHUNK; i++) {
-retry_unbud_list_i:
- spin_lock_bh(&zbud_budlists_spinlock);
- if (list_empty(&zbud_unbuddied[i].list)) {
- spin_unlock_bh(&zbud_budlists_spinlock);
- continue;
- }
- list_for_each_entry(zbpg, &zbud_unbuddied[i].list, bud_list) {
- if (unlikely(!spin_trylock(&zbpg->lock)))
- continue;
- list_del_init(&zbpg->bud_list);
- zbud_unbuddied[i].count--;
- spin_unlock(&zbud_budlists_spinlock);
- zcache_evicted_unbuddied_pages++;
- /* want budlists unlocked when doing zbpg eviction */
- zbud_evict_zbpg(zbpg);
- local_bh_enable();
- if (--nr <= 0)
- goto out;
- goto retry_unbud_list_i;
- }
- spin_unlock_bh(&zbud_budlists_spinlock);
- }
-
- /* as a last resort, free buddied pages */
-retry_bud_list:
- spin_lock_bh(&zbud_budlists_spinlock);
- if (list_empty(&zbud_buddied_list)) {
- spin_unlock_bh(&zbud_budlists_spinlock);
- goto out;
- }
- list_for_each_entry(zbpg, &zbud_buddied_list, bud_list) {
- if (unlikely(!spin_trylock(&zbpg->lock)))
- continue;
- list_del_init(&zbpg->bud_list);
- zcache_zbud_buddied_count--;
- spin_unlock(&zbud_budlists_spinlock);
- zcache_evicted_buddied_pages++;
- /* want budlists unlocked when doing zbpg eviction */
- zbud_evict_zbpg(zbpg);
- local_bh_enable();
- if (--nr <= 0)
- goto out;
- goto retry_bud_list;
- }
- spin_unlock_bh(&zbud_budlists_spinlock);
-out:
- return;
-}
-
-static void zbud_init(void)
-{
- int i;
-
- INIT_LIST_HEAD(&zbud_buddied_list);
- zcache_zbud_buddied_count = 0;
- for (i = 0; i < NCHUNKS; i++) {
- INIT_LIST_HEAD(&zbud_unbuddied[i].list);
- zbud_unbuddied[i].count = 0;
- }
-}
-
-#ifdef CONFIG_SYSFS
-/*
- * These sysfs routines show a nice distribution of how many zbpg's are
- * currently (and have ever been placed) in each unbuddied list. It's fun
- * to watch but can probably go away before final merge.
- */
-static int zbud_show_unbuddied_list_counts(char *buf)
-{
- int i;
- char *p = buf;
-
- for (i = 0; i < NCHUNKS; i++)
- p += sprintf(p, "%u ", zbud_unbuddied[i].count);
- return p - buf;
-}
-
-static int zbud_show_cumul_chunk_counts(char *buf)
-{
- unsigned long i, chunks = 0, total_chunks = 0, sum_total_chunks = 0;
- unsigned long total_chunks_lte_21 = 0, total_chunks_lte_32 = 0;
- unsigned long total_chunks_lte_42 = 0;
- char *p = buf;
-
- for (i = 0; i < NCHUNKS; i++) {
- p += sprintf(p, "%lu ", zbud_cumul_chunk_counts[i]);
- chunks += zbud_cumul_chunk_counts[i];
- total_chunks += zbud_cumul_chunk_counts[i];
- sum_total_chunks += i * zbud_cumul_chunk_counts[i];
- if (i == 21)
- total_chunks_lte_21 = total_chunks;
- if (i == 32)
- total_chunks_lte_32 = total_chunks;
- if (i == 42)
- total_chunks_lte_42 = total_chunks;
- }
- p += sprintf(p, "<=21:%lu <=32:%lu <=42:%lu, mean:%lu\n",
- total_chunks_lte_21, total_chunks_lte_32, total_chunks_lte_42,
- chunks == 0 ? 0 : sum_total_chunks / chunks);
- return p - buf;
-}
-#endif
-
-/**********
- * This "zv" PAM implementation combines the slab-based zsmalloc
- * with the crypto compression API to maximize the amount of data that can
- * be packed into a physical page.
- *
- * Zv represents a PAM page with the index and object (plus a "size" value
- * necessary for decompression) immediately preceding the compressed data.
- */
-
-#define ZVH_SENTINEL 0x43214321
-
-struct zv_hdr {
- uint32_t pool_id;
- struct tmem_oid oid;
- uint32_t index;
- size_t size;
- DECL_SENTINEL
-};
-
-/* rudimentary policy limits */
-/* total number of persistent pages may not exceed this percentage */
-static unsigned int zv_page_count_policy_percent = 75;
-/*
- * byte count defining poor compression; pages with greater zsize will be
- * rejected
- */
-static unsigned int zv_max_zsize = (PAGE_SIZE / 8) * 7;
-/*
- * byte count defining poor *mean* compression; pages with greater zsize
- * will be rejected until sufficient better-compressed pages are accepted
- * driving the mean below this threshold
- */
-static unsigned int zv_max_mean_zsize = (PAGE_SIZE / 8) * 5;
-
-static atomic_t zv_curr_dist_counts[NCHUNKS];
-static atomic_t zv_cumul_dist_counts[NCHUNKS];
-
-static struct zv_hdr *zv_create(struct zs_pool *pool, uint32_t pool_id,
- struct tmem_oid *oid, uint32_t index,
- void *cdata, unsigned clen)
-{
- struct zv_hdr *zv;
- u32 size = clen + sizeof(struct zv_hdr);
- int chunks = (size + (CHUNK_SIZE - 1)) >> CHUNK_SHIFT;
- void *handle = NULL;
-
- BUG_ON(!irqs_disabled());
- BUG_ON(chunks >= NCHUNKS);
- handle = zs_malloc(pool, size);
- if (!handle)
- goto out;
- atomic_inc(&zv_curr_dist_counts[chunks]);
- atomic_inc(&zv_cumul_dist_counts[chunks]);
- zv = zs_map_object(pool, handle);
- zv->index = index;
- zv->oid = *oid;
- zv->pool_id = pool_id;
- zv->size = clen;
- SET_SENTINEL(zv, ZVH);
- memcpy((char *)zv + sizeof(struct zv_hdr), cdata, clen);
- zs_unmap_object(pool, handle);
-out:
- return handle;
-}
-
-static void zv_free(struct zs_pool *pool, void *handle)
-{
- unsigned long flags;
- struct zv_hdr *zv;
- uint16_t size;
- int chunks;
-
- zv = zs_map_object(pool, handle);
- ASSERT_SENTINEL(zv, ZVH);
- size = zv->size + sizeof(struct zv_hdr);
- INVERT_SENTINEL(zv, ZVH);
- zs_unmap_object(pool, handle);
-
- chunks = (size + (CHUNK_SIZE - 1)) >> CHUNK_SHIFT;
- BUG_ON(chunks >= NCHUNKS);
- atomic_dec(&zv_curr_dist_counts[chunks]);
-
- local_irq_save(flags);
- zs_free(pool, handle);
- local_irq_restore(flags);
-}
-
-static void zv_decompress(struct page *page, void *handle)
-{
- unsigned int clen = PAGE_SIZE;
- char *to_va;
- int ret;
- struct zv_hdr *zv;
-
- zv = zs_map_object(zcache_host.zspool, handle);
- BUG_ON(zv->size == 0);
- ASSERT_SENTINEL(zv, ZVH);
- to_va = kmap_atomic(page);
- ret = zcache_comp_op(ZCACHE_COMPOP_DECOMPRESS, (char *)zv + sizeof(*zv),
- zv->size, to_va, &clen);
- kunmap_atomic(to_va);
- zs_unmap_object(zcache_host.zspool, handle);
- BUG_ON(ret);
- BUG_ON(clen != PAGE_SIZE);
-}
-
-#ifdef CONFIG_SYSFS
-/*
- * show a distribution of compression stats for zv pages.
- */
-
-static int zv_curr_dist_counts_show(char *buf)
-{
- unsigned long i, n, chunks = 0, sum_total_chunks = 0;
- char *p = buf;
-
- for (i = 0; i < NCHUNKS; i++) {
- n = atomic_read(&zv_curr_dist_counts[i]);
- p += sprintf(p, "%lu ", n);
- chunks += n;
- sum_total_chunks += i * n;
- }
- p += sprintf(p, "mean:%lu\n",
- chunks == 0 ? 0 : sum_total_chunks / chunks);
- return p - buf;
-}
-
-static int zv_cumul_dist_counts_show(char *buf)
-{
- unsigned long i, n, chunks = 0, sum_total_chunks = 0;
- char *p = buf;
-
- for (i = 0; i < NCHUNKS; i++) {
- n = atomic_read(&zv_cumul_dist_counts[i]);
- p += sprintf(p, "%lu ", n);
- chunks += n;
- sum_total_chunks += i * n;
- }
- p += sprintf(p, "mean:%lu\n",
- chunks == 0 ? 0 : sum_total_chunks / chunks);
- return p - buf;
-}
-
-/*
- * setting zv_max_zsize via sysfs causes all persistent (e.g. swap)
- * pages that don't compress to less than this value (including metadata
- * overhead) to be rejected. We don't allow the value to get too close
- * to PAGE_SIZE.
- */
-static ssize_t zv_max_zsize_show(struct kobject *kobj,
- struct kobj_attribute *attr,
- char *buf)
-{
- return sprintf(buf, "%u\n", zv_max_zsize);
-}
-
-static ssize_t zv_max_zsize_store(struct kobject *kobj,
- struct kobj_attribute *attr,
- const char *buf, size_t count)
-{
- unsigned long val;
- int err;
-
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
-
- err = kstrtoul(buf, 10, &val);
- if (err || (val == 0) || (val > (PAGE_SIZE / 8) * 7))
- return -EINVAL;
- zv_max_zsize = val;
- return count;
-}
-
-/*
- * setting zv_max_mean_zsize via sysfs causes all persistent (e.g. swap)
- * pages that don't compress to less than this value (including metadata
- * overhead) to be rejected UNLESS the mean compression is also smaller
- * than this value. In other words, we are load-balancing-by-zsize the
- * accepted pages. Again, we don't allow the value to get too close
- * to PAGE_SIZE.
- */
-static ssize_t zv_max_mean_zsize_show(struct kobject *kobj,
- struct kobj_attribute *attr,
- char *buf)
-{
- return sprintf(buf, "%u\n", zv_max_mean_zsize);
-}
-
-static ssize_t zv_max_mean_zsize_store(struct kobject *kobj,
- struct kobj_attribute *attr,
- const char *buf, size_t count)
-{
- unsigned long val;
- int err;
-
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
-
- err = kstrtoul(buf, 10, &val);
- if (err || (val == 0) || (val > (PAGE_SIZE / 8) * 7))
- return -EINVAL;
- zv_max_mean_zsize = val;
- return count;
-}
-
-/*
- * setting zv_page_count_policy_percent via sysfs sets an upper bound of
- * persistent (e.g. swap) pages that will be retained according to:
- * (zv_page_count_policy_percent * totalram_pages) / 100)
- * when that limit is reached, further puts will be rejected (until
- * some pages have been flushed). Note that, due to compression,
- * this number may exceed 100; it defaults to 75 and we set an
- * arbitary limit of 150. A poor choice will almost certainly result
- * in OOM's, so this value should only be changed prudently.
- */
-static ssize_t zv_page_count_policy_percent_show(struct kobject *kobj,
- struct kobj_attribute *attr,
- char *buf)
-{
- return sprintf(buf, "%u\n", zv_page_count_policy_percent);
-}
-
-static ssize_t zv_page_count_policy_percent_store(struct kobject *kobj,
- struct kobj_attribute *attr,
- const char *buf, size_t count)
-{
- unsigned long val;
- int err;
-
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
-
- err = kstrtoul(buf, 10, &val);
- if (err || (val == 0) || (val > 150))
- return -EINVAL;
- zv_page_count_policy_percent = val;
- return count;
-}
-
-static struct kobj_attribute zcache_zv_max_zsize_attr = {
- .attr = { .name = "zv_max_zsize", .mode = 0644 },
- .show = zv_max_zsize_show,
- .store = zv_max_zsize_store,
-};
-
-static struct kobj_attribute zcache_zv_max_mean_zsize_attr = {
- .attr = { .name = "zv_max_mean_zsize", .mode = 0644 },
- .show = zv_max_mean_zsize_show,
- .store = zv_max_mean_zsize_store,
-};
-
-static struct kobj_attribute zcache_zv_page_count_policy_percent_attr = {
- .attr = { .name = "zv_page_count_policy_percent",
- .mode = 0644 },
- .show = zv_page_count_policy_percent_show,
- .store = zv_page_count_policy_percent_store,
-};
-#endif
-
-/*
- * zcache core code starts here
- */
-
-/* useful stats not collected by cleancache or frontswap */
-static unsigned long zcache_flush_total;
-static unsigned long zcache_flush_found;
-static unsigned long zcache_flobj_total;
-static unsigned long zcache_flobj_found;
-static unsigned long zcache_failed_eph_puts;
-static unsigned long zcache_failed_pers_puts;
-
-/*
- * Tmem operations assume the poolid implies the invoking client.
- * Zcache only has one client (the kernel itself): LOCAL_CLIENT.
- * RAMster has each client numbered by cluster node, and a KVM version
- * of zcache would have one client per guest and each client might
- * have a poolid==N.
- */
-static struct tmem_pool *zcache_get_pool_by_id(uint16_t cli_id, uint16_t poolid)
-{
- struct tmem_pool *pool = NULL;
- struct zcache_client *cli = NULL;
-
- if (cli_id == LOCAL_CLIENT)
- cli = &zcache_host;
- else {
- if (cli_id >= MAX_CLIENTS)
- goto out;
- cli = &zcache_clients[cli_id];
- if (cli == NULL)
- goto out;
- atomic_inc(&cli->refcount);
- }
- if (poolid < MAX_POOLS_PER_CLIENT) {
- pool = cli->tmem_pools[poolid];
- if (pool != NULL)
- atomic_inc(&pool->refcount);
- }
-out:
- return pool;
-}
-
-static void zcache_put_pool(struct tmem_pool *pool)
-{
- struct zcache_client *cli = NULL;
-
- if (pool == NULL)
- BUG();
- cli = pool->client;
- atomic_dec(&pool->refcount);
- atomic_dec(&cli->refcount);
-}
-
-int zcache_new_client(uint16_t cli_id)
-{
- struct zcache_client *cli = NULL;
- int ret = -1;
-
- if (cli_id == LOCAL_CLIENT)
- cli = &zcache_host;
- else if ((unsigned int)cli_id < MAX_CLIENTS)
- cli = &zcache_clients[cli_id];
- if (cli == NULL)
- goto out;
- if (cli->allocated)
- goto out;
- cli->allocated = 1;
-#ifdef CONFIG_FRONTSWAP
- cli->zspool = zs_create_pool("zcache", ZCACHE_GFP_MASK);
- if (cli->zspool == NULL)
- goto out;
-#endif
- ret = 0;
-out:
- return ret;
-}
-
-/* counters for debugging */
-static unsigned long zcache_failed_get_free_pages;
-static unsigned long zcache_failed_alloc;
-static unsigned long zcache_put_to_flush;
-
-/*
- * for now, used named slabs so can easily track usage; later can
- * either just use kmalloc, or perhaps add a slab-like allocator
- * to more carefully manage total memory utilization
- */
-static struct kmem_cache *zcache_objnode_cache;
-static struct kmem_cache *zcache_obj_cache;
-static atomic_t zcache_curr_obj_count = ATOMIC_INIT(0);
-static unsigned long zcache_curr_obj_count_max;
-static atomic_t zcache_curr_objnode_count = ATOMIC_INIT(0);
-static unsigned long zcache_curr_objnode_count_max;
-
-/*
- * to avoid memory allocation recursion (e.g. due to direct reclaim), we
- * preload all necessary data structures so the hostops callbacks never
- * actually do a malloc
- */
-struct zcache_preload {
- void *page;
- struct tmem_obj *obj;
- int nr;
- struct tmem_objnode *objnodes[OBJNODE_TREE_MAX_PATH];
-};
-static DEFINE_PER_CPU(struct zcache_preload, zcache_preloads) = { 0, };
-
-static int zcache_do_preload(struct tmem_pool *pool)
-{
- struct zcache_preload *kp;
- struct tmem_objnode *objnode;
- struct tmem_obj *obj;
- void *page;
- int ret = -ENOMEM;
-
- if (unlikely(zcache_objnode_cache == NULL))
- goto out;
- if (unlikely(zcache_obj_cache == NULL))
- goto out;
- preempt_disable();
- kp = &__get_cpu_var(zcache_preloads);
- while (kp->nr < ARRAY_SIZE(kp->objnodes)) {
- preempt_enable_no_resched();
- objnode = kmem_cache_alloc(zcache_objnode_cache,
- ZCACHE_GFP_MASK);
- if (unlikely(objnode == NULL)) {
- zcache_failed_alloc++;
- goto out;
- }
- preempt_disable();
- kp = &__get_cpu_var(zcache_preloads);
- if (kp->nr < ARRAY_SIZE(kp->objnodes))
- kp->objnodes[kp->nr++] = objnode;
- else
- kmem_cache_free(zcache_objnode_cache, objnode);
- }
- preempt_enable_no_resched();
- obj = kmem_cache_alloc(zcache_obj_cache, ZCACHE_GFP_MASK);
- if (unlikely(obj == NULL)) {
- zcache_failed_alloc++;
- goto out;
- }
- page = (void *)__get_free_page(ZCACHE_GFP_MASK);
- if (unlikely(page == NULL)) {
- zcache_failed_get_free_pages++;
- kmem_cache_free(zcache_obj_cache, obj);
- goto out;
- }
- preempt_disable();
- kp = &__get_cpu_var(zcache_preloads);
- if (kp->obj == NULL)
- kp->obj = obj;
- else
- kmem_cache_free(zcache_obj_cache, obj);
- if (kp->page == NULL)
- kp->page = page;
- else
- free_page((unsigned long)page);
- ret = 0;
-out:
- return ret;
-}
-
-static void *zcache_get_free_page(void)
-{
- struct zcache_preload *kp;
- void *page;
-
- kp = &__get_cpu_var(zcache_preloads);
- page = kp->page;
- BUG_ON(page == NULL);
- kp->page = NULL;
- return page;
-}
-
-static void zcache_free_page(void *p)
-{
- free_page((unsigned long)p);
-}
-
-/*
- * zcache implementation for tmem host ops
- */
-
-static struct tmem_objnode *zcache_objnode_alloc(struct tmem_pool *pool)
-{
- struct tmem_objnode *objnode = NULL;
- unsigned long count;
- struct zcache_preload *kp;
-
- kp = &__get_cpu_var(zcache_preloads);
- if (kp->nr <= 0)
- goto out;
- objnode = kp->objnodes[kp->nr - 1];
- BUG_ON(objnode == NULL);
- kp->objnodes[kp->nr - 1] = NULL;
- kp->nr--;
- count = atomic_inc_return(&zcache_curr_objnode_count);
- if (count > zcache_curr_objnode_count_max)
- zcache_curr_objnode_count_max = count;
-out:
- return objnode;
-}
-
-static void zcache_objnode_free(struct tmem_objnode *objnode,
- struct tmem_pool *pool)
-{
- atomic_dec(&zcache_curr_objnode_count);
- BUG_ON(atomic_read(&zcache_curr_objnode_count) < 0);
- kmem_cache_free(zcache_objnode_cache, objnode);
-}
-
-static struct tmem_obj *zcache_obj_alloc(struct tmem_pool *pool)
-{
- struct tmem_obj *obj = NULL;
- unsigned long count;
- struct zcache_preload *kp;
-
- kp = &__get_cpu_var(zcache_preloads);
- obj = kp->obj;
- BUG_ON(obj == NULL);
- kp->obj = NULL;
- count = atomic_inc_return(&zcache_curr_obj_count);
- if (count > zcache_curr_obj_count_max)
- zcache_curr_obj_count_max = count;
- return obj;
-}
-
-static void zcache_obj_free(struct tmem_obj *obj, struct tmem_pool *pool)
-{
- atomic_dec(&zcache_curr_obj_count);
- BUG_ON(atomic_read(&zcache_curr_obj_count) < 0);
- kmem_cache_free(zcache_obj_cache, obj);
-}
-
-static struct tmem_hostops zcache_hostops = {
- .obj_alloc = zcache_obj_alloc,
- .obj_free = zcache_obj_free,
- .objnode_alloc = zcache_objnode_alloc,
- .objnode_free = zcache_objnode_free,
-};
-
-/*
- * zcache implementations for PAM page descriptor ops
- */
-
-static atomic_t zcache_curr_eph_pampd_count = ATOMIC_INIT(0);
-static unsigned long zcache_curr_eph_pampd_count_max;
-static atomic_t zcache_curr_pers_pampd_count = ATOMIC_INIT(0);
-static unsigned long zcache_curr_pers_pampd_count_max;
-
-/* forward reference */
-static int zcache_compress(struct page *from, void **out_va, unsigned *out_len);
-
-static void *zcache_pampd_create(char *data, size_t size, bool raw, int eph,
- struct tmem_pool *pool, struct tmem_oid *oid,
- uint32_t index)
-{
- void *pampd = NULL, *cdata;
- unsigned clen;
- int ret;
- unsigned long count;
- struct page *page = (struct page *)(data);
- struct zcache_client *cli = pool->client;
- uint16_t client_id = get_client_id_from_client(cli);
- unsigned long zv_mean_zsize;
- unsigned long curr_pers_pampd_count;
- u64 total_zsize;
-
- if (eph) {
- ret = zcache_compress(page, &cdata, &clen);
- if (ret == 0)
- goto out;
- if (clen == 0 || clen > zbud_max_buddy_size()) {
- zcache_compress_poor++;
- goto out;
- }
- pampd = (void *)zbud_create(client_id, pool->pool_id, oid,
- index, page, cdata, clen);
- if (pampd != NULL) {
- count = atomic_inc_return(&zcache_curr_eph_pampd_count);
- if (count > zcache_curr_eph_pampd_count_max)
- zcache_curr_eph_pampd_count_max = count;
- }
- } else {
- curr_pers_pampd_count =
- atomic_read(&zcache_curr_pers_pampd_count);
- if (curr_pers_pampd_count >
- (zv_page_count_policy_percent * totalram_pages) / 100)
- goto out;
- ret = zcache_compress(page, &cdata, &clen);
- if (ret == 0)
- goto out;
- /* reject if compression is too poor */
- if (clen > zv_max_zsize) {
- zcache_compress_poor++;
- goto out;
- }
- /* reject if mean compression is too poor */
- if ((clen > zv_max_mean_zsize) && (curr_pers_pampd_count > 0)) {
- total_zsize = zs_get_total_size_bytes(cli->zspool);
- zv_mean_zsize = div_u64(total_zsize,
- curr_pers_pampd_count);
- if (zv_mean_zsize > zv_max_mean_zsize) {
- zcache_mean_compress_poor++;
- goto out;
- }
- }
- pampd = (void *)zv_create(cli->zspool, pool->pool_id,
- oid, index, cdata, clen);
- if (pampd == NULL)
- goto out;
- count = atomic_inc_return(&zcache_curr_pers_pampd_count);
- if (count > zcache_curr_pers_pampd_count_max)
- zcache_curr_pers_pampd_count_max = count;
- }
-out:
- return pampd;
-}
-
-/*
- * fill the pageframe corresponding to the struct page with the data
- * from the passed pampd
- */
-static int zcache_pampd_get_data(char *data, size_t *bufsize, bool raw,
- void *pampd, struct tmem_pool *pool,
- struct tmem_oid *oid, uint32_t index)
-{
- int ret = 0;
-
- BUG_ON(is_ephemeral(pool));
- zv_decompress((struct page *)(data), pampd);
- return ret;
-}
-
-/*
- * fill the pageframe corresponding to the struct page with the data
- * from the passed pampd
- */
-static int zcache_pampd_get_data_and_free(char *data, size_t *bufsize, bool raw,
- void *pampd, struct tmem_pool *pool,
- struct tmem_oid *oid, uint32_t index)
-{
- int ret = 0;
-
- BUG_ON(!is_ephemeral(pool));
- zbud_decompress((struct page *)(data), pampd);
- zbud_free_and_delist((struct zbud_hdr *)pampd);
- atomic_dec(&zcache_curr_eph_pampd_count);
- return ret;
-}
-
-/*
- * free the pampd and remove it from any zcache lists
- * pampd must no longer be pointed to from any tmem data structures!
- */
-static void zcache_pampd_free(void *pampd, struct tmem_pool *pool,
- struct tmem_oid *oid, uint32_t index)
-{
- struct zcache_client *cli = pool->client;
-
- if (is_ephemeral(pool)) {
- zbud_free_and_delist((struct zbud_hdr *)pampd);
- atomic_dec(&zcache_curr_eph_pampd_count);
- BUG_ON(atomic_read(&zcache_curr_eph_pampd_count) < 0);
- } else {
- zv_free(cli->zspool, pampd);
- atomic_dec(&zcache_curr_pers_pampd_count);
- BUG_ON(atomic_read(&zcache_curr_pers_pampd_count) < 0);
- }
-}
-
-static void zcache_pampd_free_obj(struct tmem_pool *pool, struct tmem_obj *obj)
-{
-}
-
-static void zcache_pampd_new_obj(struct tmem_obj *obj)
-{
-}
-
-static int zcache_pampd_replace_in_obj(void *pampd, struct tmem_obj *obj)
-{
- return -1;
-}
-
-static bool zcache_pampd_is_remote(void *pampd)
-{
- return 0;
-}
-
-static struct tmem_pamops zcache_pamops = {
- .create = zcache_pampd_create,
- .get_data = zcache_pampd_get_data,
- .get_data_and_free = zcache_pampd_get_data_and_free,
- .free = zcache_pampd_free,
- .free_obj = zcache_pampd_free_obj,
- .new_obj = zcache_pampd_new_obj,
- .replace_in_obj = zcache_pampd_replace_in_obj,
- .is_remote = zcache_pampd_is_remote,
-};
-
-/*
- * zcache compression/decompression and related per-cpu stuff
- */
-
-static DEFINE_PER_CPU(unsigned char *, zcache_dstmem);
-#define ZCACHE_DSTMEM_ORDER 1
-
-static int zcache_compress(struct page *from, void **out_va, unsigned *out_len)
-{
- int ret = 0;
- unsigned char *dmem = __get_cpu_var(zcache_dstmem);
- char *from_va;
-
- BUG_ON(!irqs_disabled());
- if (unlikely(dmem == NULL))
- goto out; /* no buffer or no compressor so can't compress */
- *out_len = PAGE_SIZE << ZCACHE_DSTMEM_ORDER;
- from_va = kmap_atomic(from);
- mb();
- ret = zcache_comp_op(ZCACHE_COMPOP_COMPRESS, from_va, PAGE_SIZE, dmem,
- out_len);
- BUG_ON(ret);
- *out_va = dmem;
- kunmap_atomic(from_va);
- ret = 1;
-out:
- return ret;
-}
-
-static int zcache_comp_cpu_up(int cpu)
-{
- struct crypto_comp *tfm;
-
- tfm = crypto_alloc_comp(zcache_comp_name, 0, 0);
- if (IS_ERR(tfm))
- return NOTIFY_BAD;
- *per_cpu_ptr(zcache_comp_pcpu_tfms, cpu) = tfm;
- return NOTIFY_OK;
-}
-
-static void zcache_comp_cpu_down(int cpu)
-{
- struct crypto_comp *tfm;
-
- tfm = *per_cpu_ptr(zcache_comp_pcpu_tfms, cpu);
- crypto_free_comp(tfm);
- *per_cpu_ptr(zcache_comp_pcpu_tfms, cpu) = NULL;
-}
-
-static int zcache_cpu_notifier(struct notifier_block *nb,
- unsigned long action, void *pcpu)
-{
- int ret, cpu = (long)pcpu;
- struct zcache_preload *kp;
-
- switch (action) {
- case CPU_UP_PREPARE:
- ret = zcache_comp_cpu_up(cpu);
- if (ret != NOTIFY_OK) {
- pr_err("zcache: can't allocate compressor transform\n");
- return ret;
- }
- per_cpu(zcache_dstmem, cpu) = (void *)__get_free_pages(
- GFP_KERNEL | __GFP_REPEAT, ZCACHE_DSTMEM_ORDER);
- break;
- case CPU_DEAD:
- case CPU_UP_CANCELED:
- zcache_comp_cpu_down(cpu);
- free_pages((unsigned long)per_cpu(zcache_dstmem, cpu),
- ZCACHE_DSTMEM_ORDER);
- per_cpu(zcache_dstmem, cpu) = NULL;
- kp = &per_cpu(zcache_preloads, cpu);
- while (kp->nr) {
- kmem_cache_free(zcache_objnode_cache,
- kp->objnodes[kp->nr - 1]);
- kp->objnodes[kp->nr - 1] = NULL;
- kp->nr--;
- }
- if (kp->obj) {
- kmem_cache_free(zcache_obj_cache, kp->obj);
- kp->obj = NULL;
- }
- if (kp->page) {
- free_page((unsigned long)kp->page);
- kp->page = NULL;
- }
- break;
- default:
- break;
- }
- return NOTIFY_OK;
-}
-
-static struct notifier_block zcache_cpu_notifier_block = {
- .notifier_call = zcache_cpu_notifier
-};
-
-#ifdef CONFIG_SYSFS
-#define ZCACHE_SYSFS_RO(_name) \
- static ssize_t zcache_##_name##_show(struct kobject *kobj, \
- struct kobj_attribute *attr, char *buf) \
- { \
- return sprintf(buf, "%lu\n", zcache_##_name); \
- } \
- static struct kobj_attribute zcache_##_name##_attr = { \
- .attr = { .name = __stringify(_name), .mode = 0444 }, \
- .show = zcache_##_name##_show, \
- }
-
-#define ZCACHE_SYSFS_RO_ATOMIC(_name) \
- static ssize_t zcache_##_name##_show(struct kobject *kobj, \
- struct kobj_attribute *attr, char *buf) \
- { \
- return sprintf(buf, "%d\n", atomic_read(&zcache_##_name)); \
- } \
- static struct kobj_attribute zcache_##_name##_attr = { \
- .attr = { .name = __stringify(_name), .mode = 0444 }, \
- .show = zcache_##_name##_show, \
- }
-
-#define ZCACHE_SYSFS_RO_CUSTOM(_name, _func) \
- static ssize_t zcache_##_name##_show(struct kobject *kobj, \
- struct kobj_attribute *attr, char *buf) \
- { \
- return _func(buf); \
- } \
- static struct kobj_attribute zcache_##_name##_attr = { \
- .attr = { .name = __stringify(_name), .mode = 0444 }, \
- .show = zcache_##_name##_show, \
- }
-
-ZCACHE_SYSFS_RO(curr_obj_count_max);
-ZCACHE_SYSFS_RO(curr_objnode_count_max);
-ZCACHE_SYSFS_RO(flush_total);
-ZCACHE_SYSFS_RO(flush_found);
-ZCACHE_SYSFS_RO(flobj_total);
-ZCACHE_SYSFS_RO(flobj_found);
-ZCACHE_SYSFS_RO(failed_eph_puts);
-ZCACHE_SYSFS_RO(failed_pers_puts);
-ZCACHE_SYSFS_RO(zbud_curr_zbytes);
-ZCACHE_SYSFS_RO(zbud_cumul_zpages);
-ZCACHE_SYSFS_RO(zbud_cumul_zbytes);
-ZCACHE_SYSFS_RO(zbud_buddied_count);
-ZCACHE_SYSFS_RO(zbpg_unused_list_count);
-ZCACHE_SYSFS_RO(evicted_raw_pages);
-ZCACHE_SYSFS_RO(evicted_unbuddied_pages);
-ZCACHE_SYSFS_RO(evicted_buddied_pages);
-ZCACHE_SYSFS_RO(failed_get_free_pages);
-ZCACHE_SYSFS_RO(failed_alloc);
-ZCACHE_SYSFS_RO(put_to_flush);
-ZCACHE_SYSFS_RO(compress_poor);
-ZCACHE_SYSFS_RO(mean_compress_poor);
-ZCACHE_SYSFS_RO_ATOMIC(zbud_curr_raw_pages);
-ZCACHE_SYSFS_RO_ATOMIC(zbud_curr_zpages);
-ZCACHE_SYSFS_RO_ATOMIC(curr_obj_count);
-ZCACHE_SYSFS_RO_ATOMIC(curr_objnode_count);
-ZCACHE_SYSFS_RO_CUSTOM(zbud_unbuddied_list_counts,
- zbud_show_unbuddied_list_counts);
-ZCACHE_SYSFS_RO_CUSTOM(zbud_cumul_chunk_counts,
- zbud_show_cumul_chunk_counts);
-ZCACHE_SYSFS_RO_CUSTOM(zv_curr_dist_counts,
- zv_curr_dist_counts_show);
-ZCACHE_SYSFS_RO_CUSTOM(zv_cumul_dist_counts,
- zv_cumul_dist_counts_show);
-
-static struct attribute *zcache_attrs[] = {
- &zcache_curr_obj_count_attr.attr,
- &zcache_curr_obj_count_max_attr.attr,
- &zcache_curr_objnode_count_attr.attr,
- &zcache_curr_objnode_count_max_attr.attr,
- &zcache_flush_total_attr.attr,
- &zcache_flobj_total_attr.attr,
- &zcache_flush_found_attr.attr,
- &zcache_flobj_found_attr.attr,
- &zcache_failed_eph_puts_attr.attr,
- &zcache_failed_pers_puts_attr.attr,
- &zcache_compress_poor_attr.attr,
- &zcache_mean_compress_poor_attr.attr,
- &zcache_zbud_curr_raw_pages_attr.attr,
- &zcache_zbud_curr_zpages_attr.attr,
- &zcache_zbud_curr_zbytes_attr.attr,
- &zcache_zbud_cumul_zpages_attr.attr,
- &zcache_zbud_cumul_zbytes_attr.attr,
- &zcache_zbud_buddied_count_attr.attr,
- &zcache_zbpg_unused_list_count_attr.attr,
- &zcache_evicted_raw_pages_attr.attr,
- &zcache_evicted_unbuddied_pages_attr.attr,
- &zcache_evicted_buddied_pages_attr.attr,
- &zcache_failed_get_free_pages_attr.attr,
- &zcache_failed_alloc_attr.attr,
- &zcache_put_to_flush_attr.attr,
- &zcache_zbud_unbuddied_list_counts_attr.attr,
- &zcache_zbud_cumul_chunk_counts_attr.attr,
- &zcache_zv_curr_dist_counts_attr.attr,
- &zcache_zv_cumul_dist_counts_attr.attr,
- &zcache_zv_max_zsize_attr.attr,
- &zcache_zv_max_mean_zsize_attr.attr,
- &zcache_zv_page_count_policy_percent_attr.attr,
- NULL,
-};
-
-static struct attribute_group zcache_attr_group = {
- .attrs = zcache_attrs,
- .name = "zcache",
-};
-
-#endif /* CONFIG_SYSFS */
-/*
- * When zcache is disabled ("frozen"), pools can be created and destroyed,
- * but all puts (and thus all other operations that require memory allocation)
- * must fail. If zcache is unfrozen, accepts puts, then frozen again,
- * data consistency requires all puts while frozen to be converted into
- * flushes.
- */
-static bool zcache_freeze;
-
-/*
- * zcache shrinker interface (only useful for ephemeral pages, so zbud only)
- */
-static int shrink_zcache_memory(struct shrinker *shrink,
- struct shrink_control *sc)
-{
- int ret = -1;
- int nr = sc->nr_to_scan;
- gfp_t gfp_mask = sc->gfp_mask;
-
- if (nr >= 0) {
- if (!(gfp_mask & __GFP_FS))
- /* does this case really need to be skipped? */
- goto out;
- zbud_evict_pages(nr);
- }
- ret = (int)atomic_read(&zcache_zbud_curr_raw_pages);
-out:
- return ret;
-}
-
-static struct shrinker zcache_shrinker = {
- .shrink = shrink_zcache_memory,
- .seeks = DEFAULT_SEEKS,
-};
-
-/*
- * zcache shims between cleancache/frontswap ops and tmem
- */
-
-static int zcache_put_page(int cli_id, int pool_id, struct tmem_oid *oidp,
- uint32_t index, struct page *page)
-{
- struct tmem_pool *pool;
- int ret = -1;
-
- BUG_ON(!irqs_disabled());
- pool = zcache_get_pool_by_id(cli_id, pool_id);
- if (unlikely(pool == NULL))
- goto out;
- if (!zcache_freeze && zcache_do_preload(pool) == 0) {
- /* preload does preempt_disable on success */
- ret = tmem_put(pool, oidp, index, (char *)(page),
- PAGE_SIZE, 0, is_ephemeral(pool));
- if (ret < 0) {
- if (is_ephemeral(pool))
- zcache_failed_eph_puts++;
- else
- zcache_failed_pers_puts++;
- }
- zcache_put_pool(pool);
- preempt_enable_no_resched();
- } else {
- zcache_put_to_flush++;
- if (atomic_read(&pool->obj_count) > 0)
- /* the put fails whether the flush succeeds or not */
- (void)tmem_flush_page(pool, oidp, index);
- zcache_put_pool(pool);
- }
-out:
- return ret;
-}
-
-static int zcache_get_page(int cli_id, int pool_id, struct tmem_oid *oidp,
- uint32_t index, struct page *page)
-{
- struct tmem_pool *pool;
- int ret = -1;
- unsigned long flags;
- size_t size = PAGE_SIZE;
-
- local_irq_save(flags);
- pool = zcache_get_pool_by_id(cli_id, pool_id);
- if (likely(pool != NULL)) {
- if (atomic_read(&pool->obj_count) > 0)
- ret = tmem_get(pool, oidp, index, (char *)(page),
- &size, 0, is_ephemeral(pool));
- zcache_put_pool(pool);
- }
- local_irq_restore(flags);
- return ret;
-}
-
-static int zcache_flush_page(int cli_id, int pool_id,
- struct tmem_oid *oidp, uint32_t index)
-{
- struct tmem_pool *pool;
- int ret = -1;
- unsigned long flags;
-
- local_irq_save(flags);
- zcache_flush_total++;
- pool = zcache_get_pool_by_id(cli_id, pool_id);
- if (likely(pool != NULL)) {
- if (atomic_read(&pool->obj_count) > 0)
- ret = tmem_flush_page(pool, oidp, index);
- zcache_put_pool(pool);
- }
- if (ret >= 0)
- zcache_flush_found++;
- local_irq_restore(flags);
- return ret;
-}
-
-static int zcache_flush_object(int cli_id, int pool_id,
- struct tmem_oid *oidp)
-{
- struct tmem_pool *pool;
- int ret = -1;
- unsigned long flags;
-
- local_irq_save(flags);
- zcache_flobj_total++;
- pool = zcache_get_pool_by_id(cli_id, pool_id);
- if (likely(pool != NULL)) {
- if (atomic_read(&pool->obj_count) > 0)
- ret = tmem_flush_object(pool, oidp);
- zcache_put_pool(pool);
- }
- if (ret >= 0)
- zcache_flobj_found++;
- local_irq_restore(flags);
- return ret;
-}
-
-static int zcache_destroy_pool(int cli_id, int pool_id)
-{
- struct tmem_pool *pool = NULL;
- struct zcache_client *cli = NULL;
- int ret = -1;
-
- if (pool_id < 0)
- goto out;
- if (cli_id == LOCAL_CLIENT)
- cli = &zcache_host;
- else if ((unsigned int)cli_id < MAX_CLIENTS)
- cli = &zcache_clients[cli_id];
- if (cli == NULL)
- goto out;
- atomic_inc(&cli->refcount);
- pool = cli->tmem_pools[pool_id];
- if (pool == NULL)
- goto out;
- cli->tmem_pools[pool_id] = NULL;
- /* wait for pool activity on other cpus to quiesce */
- while (atomic_read(&pool->refcount) != 0)
- ;
- atomic_dec(&cli->refcount);
- local_bh_disable();
- ret = tmem_destroy_pool(pool);
- local_bh_enable();
- kfree(pool);
- pr_info("zcache: destroyed pool id=%d, cli_id=%d\n",
- pool_id, cli_id);
-out:
- return ret;
-}
-
-static int zcache_new_pool(uint16_t cli_id, uint32_t flags)
-{
- int poolid = -1;
- struct tmem_pool *pool;
- struct zcache_client *cli = NULL;
-
- if (cli_id == LOCAL_CLIENT)
- cli = &zcache_host;
- else if ((unsigned int)cli_id < MAX_CLIENTS)
- cli = &zcache_clients[cli_id];
- if (cli == NULL)
- goto out;
- atomic_inc(&cli->refcount);
- pool = kmalloc(sizeof(struct tmem_pool), GFP_ATOMIC);
- if (pool == NULL) {
- pr_info("zcache: pool creation failed: out of memory\n");
- goto out;
- }
-
- for (poolid = 0; poolid < MAX_POOLS_PER_CLIENT; poolid++)
- if (cli->tmem_pools[poolid] == NULL)
- break;
- if (poolid >= MAX_POOLS_PER_CLIENT) {
- pr_info("zcache: pool creation failed: max exceeded\n");
- kfree(pool);
- poolid = -1;
- goto out;
- }
- atomic_set(&pool->refcount, 0);
- pool->client = cli;
- pool->pool_id = poolid;
- tmem_new_pool(pool, flags);
- cli->tmem_pools[poolid] = pool;
- pr_info("zcache: created %s tmem pool, id=%d, client=%d\n",
- flags & TMEM_POOL_PERSIST ? "persistent" : "ephemeral",
- poolid, cli_id);
-out:
- if (cli != NULL)
- atomic_dec(&cli->refcount);
- return poolid;
-}
-
-/**********
- * Two kernel functionalities currently can be layered on top of tmem.
- * These are "cleancache" which is used as a second-chance cache for clean
- * page cache pages; and "frontswap" which is used for swap pages
- * to avoid writes to disk. A generic "shim" is provided here for each
- * to translate in-kernel semantics to zcache semantics.
- */
-
-#ifdef CONFIG_CLEANCACHE
-static void zcache_cleancache_put_page(int pool_id,
- struct cleancache_filekey key,
- pgoff_t index, struct page *page)
-{
- u32 ind = (u32) index;
- struct tmem_oid oid = *(struct tmem_oid *)&key;
-
- if (likely(ind == index))
- (void)zcache_put_page(LOCAL_CLIENT, pool_id, &oid, index, page);
-}
-
-static int zcache_cleancache_get_page(int pool_id,
- struct cleancache_filekey key,
- pgoff_t index, struct page *page)
-{
- u32 ind = (u32) index;
- struct tmem_oid oid = *(struct tmem_oid *)&key;
- int ret = -1;
-
- if (likely(ind == index))
- ret = zcache_get_page(LOCAL_CLIENT, pool_id, &oid, index, page);
- return ret;
-}
-
-static void zcache_cleancache_flush_page(int pool_id,
- struct cleancache_filekey key,
- pgoff_t index)
-{
- u32 ind = (u32) index;
- struct tmem_oid oid = *(struct tmem_oid *)&key;
-
- if (likely(ind == index))
- (void)zcache_flush_page(LOCAL_CLIENT, pool_id, &oid, ind);
-}
-
-static void zcache_cleancache_flush_inode(int pool_id,
- struct cleancache_filekey key)
-{
- struct tmem_oid oid = *(struct tmem_oid *)&key;
-
- (void)zcache_flush_object(LOCAL_CLIENT, pool_id, &oid);
-}
-
-static void zcache_cleancache_flush_fs(int pool_id)
-{
- if (pool_id >= 0)
- (void)zcache_destroy_pool(LOCAL_CLIENT, pool_id);
-}
-
-static int zcache_cleancache_init_fs(size_t pagesize)
-{
- BUG_ON(sizeof(struct cleancache_filekey) !=
- sizeof(struct tmem_oid));
- BUG_ON(pagesize != PAGE_SIZE);
- return zcache_new_pool(LOCAL_CLIENT, 0);
-}
-
-static int zcache_cleancache_init_shared_fs(char *uuid, size_t pagesize)
-{
- /* shared pools are unsupported and map to private */
- BUG_ON(sizeof(struct cleancache_filekey) !=
- sizeof(struct tmem_oid));
- BUG_ON(pagesize != PAGE_SIZE);
- return zcache_new_pool(LOCAL_CLIENT, 0);
-}
-
-static struct cleancache_ops zcache_cleancache_ops = {
- .put_page = zcache_cleancache_put_page,
- .get_page = zcache_cleancache_get_page,
- .invalidate_page = zcache_cleancache_flush_page,
- .invalidate_inode = zcache_cleancache_flush_inode,
- .invalidate_fs = zcache_cleancache_flush_fs,
- .init_shared_fs = zcache_cleancache_init_shared_fs,
- .init_fs = zcache_cleancache_init_fs
-};
-
-struct cleancache_ops zcache_cleancache_register_ops(void)
-{
- struct cleancache_ops old_ops =
- cleancache_register_ops(&zcache_cleancache_ops);
-
- return old_ops;
-}
-#endif
-
-#ifdef CONFIG_FRONTSWAP
-/* a single tmem poolid is used for all frontswap "types" (swapfiles) */
-static int zcache_frontswap_poolid = -1;
-
-/*
- * Swizzling increases objects per swaptype, increasing tmem concurrency
- * for heavy swaploads. Later, larger nr_cpus -> larger SWIZ_BITS
- * Setting SWIZ_BITS to 27 basically reconstructs the swap entry from
- * frontswap_load(), but has side-effects. Hence using 8.
- */
-#define SWIZ_BITS 8
-#define SWIZ_MASK ((1 << SWIZ_BITS) - 1)
-#define _oswiz(_type, _ind) ((_type << SWIZ_BITS) | (_ind & SWIZ_MASK))
-#define iswiz(_ind) (_ind >> SWIZ_BITS)
-
-static inline struct tmem_oid oswiz(unsigned type, u32 ind)
-{
- struct tmem_oid oid = { .oid = { 0 } };
- oid.oid[0] = _oswiz(type, ind);
- return oid;
-}
-
-static int zcache_frontswap_store(unsigned type, pgoff_t offset,
- struct page *page)
-{
- u64 ind64 = (u64)offset;
- u32 ind = (u32)offset;
- struct tmem_oid oid = oswiz(type, ind);
- int ret = -1;
- unsigned long flags;
-
- BUG_ON(!PageLocked(page));
- if (likely(ind64 == ind)) {
- local_irq_save(flags);
- ret = zcache_put_page(LOCAL_CLIENT, zcache_frontswap_poolid,
- &oid, iswiz(ind), page);
- local_irq_restore(flags);
- }
- return ret;
-}
-
-/* returns 0 if the page was successfully gotten from frontswap, -1 if
- * was not present (should never happen!) */
-static int zcache_frontswap_load(unsigned type, pgoff_t offset,
- struct page *page)
-{
- u64 ind64 = (u64)offset;
- u32 ind = (u32)offset;
- struct tmem_oid oid = oswiz(type, ind);
- int ret = -1;
-
- BUG_ON(!PageLocked(page));
- if (likely(ind64 == ind))
- ret = zcache_get_page(LOCAL_CLIENT, zcache_frontswap_poolid,
- &oid, iswiz(ind), page);
- return ret;
-}
-
-/* flush a single page from frontswap */
-static void zcache_frontswap_flush_page(unsigned type, pgoff_t offset)
-{
- u64 ind64 = (u64)offset;
- u32 ind = (u32)offset;
- struct tmem_oid oid = oswiz(type, ind);
-
- if (likely(ind64 == ind))
- (void)zcache_flush_page(LOCAL_CLIENT, zcache_frontswap_poolid,
- &oid, iswiz(ind));
-}
-
-/* flush all pages from the passed swaptype */
-static void zcache_frontswap_flush_area(unsigned type)
-{
- struct tmem_oid oid;
- int ind;
-
- for (ind = SWIZ_MASK; ind >= 0; ind--) {
- oid = oswiz(type, ind);
- (void)zcache_flush_object(LOCAL_CLIENT,
- zcache_frontswap_poolid, &oid);
- }
-}
-
-static void zcache_frontswap_init(unsigned ignored)
-{
- /* a single tmem poolid is used for all frontswap "types" (swapfiles) */
- if (zcache_frontswap_poolid < 0)
- zcache_frontswap_poolid =
- zcache_new_pool(LOCAL_CLIENT, TMEM_POOL_PERSIST);
-}
-
-static struct frontswap_ops zcache_frontswap_ops = {
- .store = zcache_frontswap_store,
- .load = zcache_frontswap_load,
- .invalidate_page = zcache_frontswap_flush_page,
- .invalidate_area = zcache_frontswap_flush_area,
- .init = zcache_frontswap_init
-};
-
-struct frontswap_ops zcache_frontswap_register_ops(void)
-{
- struct frontswap_ops old_ops =
- frontswap_register_ops(&zcache_frontswap_ops);
-
- return old_ops;
-}
-#endif
-
-/*
- * zcache initialization
- * NOTE FOR NOW zcache MUST BE PROVIDED AS A KERNEL BOOT PARAMETER OR
- * NOTHING HAPPENS!
- */
-
-static int zcache_enabled;
-
-static int __init enable_zcache(char *s)
-{
- zcache_enabled = 1;
- return 1;
-}
-__setup("zcache", enable_zcache);
-
-/* allow independent dynamic disabling of cleancache and frontswap */
-
-static int use_cleancache = 1;
-
-static int __init no_cleancache(char *s)
-{
- use_cleancache = 0;
- return 1;
-}
-
-__setup("nocleancache", no_cleancache);
-
-static int use_frontswap = 1;
-
-static int __init no_frontswap(char *s)
-{
- use_frontswap = 0;
- return 1;
-}
-
-__setup("nofrontswap", no_frontswap);
-
-static int __init enable_zcache_compressor(char *s)
-{
- strncpy(zcache_comp_name, s, ZCACHE_COMP_NAME_SZ);
- zcache_enabled = 1;
- return 1;
-}
-__setup("zcache=", enable_zcache_compressor);
-
-
-static int zcache_comp_init(void)
-{
- int ret = 0;
-
- /* check crypto algorithm */
- if (*zcache_comp_name != '\0') {
- ret = crypto_has_comp(zcache_comp_name, 0, 0);
- if (!ret)
- pr_info("zcache: %s not supported\n",
- zcache_comp_name);
- }
- if (!ret)
- strcpy(zcache_comp_name, "lzo");
- ret = crypto_has_comp(zcache_comp_name, 0, 0);
- if (!ret) {
- ret = 1;
- goto out;
- }
- pr_info("zcache: using %s compressor\n", zcache_comp_name);
-
- /* alloc percpu transforms */
- ret = 0;
- zcache_comp_pcpu_tfms = alloc_percpu(struct crypto_comp *);
- if (!zcache_comp_pcpu_tfms)
- ret = 1;
-out:
- return ret;
-}
-
-static int __init zcache_init(void)
-{
- int ret = 0;
-
-#ifdef CONFIG_SYSFS
- ret = sysfs_create_group(mm_kobj, &zcache_attr_group);
- if (ret) {
- pr_err("zcache: can't create sysfs\n");
- goto out;
- }
-#endif /* CONFIG_SYSFS */
-#if defined(CONFIG_CLEANCACHE) || defined(CONFIG_FRONTSWAP)
- if (zcache_enabled) {
- unsigned int cpu;
-
- tmem_register_hostops(&zcache_hostops);
- tmem_register_pamops(&zcache_pamops);
- ret = register_cpu_notifier(&zcache_cpu_notifier_block);
- if (ret) {
- pr_err("zcache: can't register cpu notifier\n");
- goto out;
- }
- ret = zcache_comp_init();
- if (ret) {
- pr_err("zcache: compressor initialization failed\n");
- goto out;
- }
- for_each_online_cpu(cpu) {
- void *pcpu = (void *)(long)cpu;
- zcache_cpu_notifier(&zcache_cpu_notifier_block,
- CPU_UP_PREPARE, pcpu);
- }
- }
- zcache_objnode_cache = kmem_cache_create("zcache_objnode",
- sizeof(struct tmem_objnode), 0, 0, NULL);
- zcache_obj_cache = kmem_cache_create("zcache_obj",
- sizeof(struct tmem_obj), 0, 0, NULL);
- ret = zcache_new_client(LOCAL_CLIENT);
- if (ret) {
- pr_err("zcache: can't create client\n");
- goto out;
- }
-#endif
-#ifdef CONFIG_CLEANCACHE
- if (zcache_enabled && use_cleancache) {
- struct cleancache_ops old_ops;
-
- zbud_init();
- register_shrinker(&zcache_shrinker);
- old_ops = zcache_cleancache_register_ops();
- pr_info("zcache: cleancache enabled using kernel "
- "transcendent memory and compression buddies\n");
- if (old_ops.init_fs != NULL)
- pr_warning("zcache: cleancache_ops overridden");
- }
-#endif
-#ifdef CONFIG_FRONTSWAP
- if (zcache_enabled && use_frontswap) {
- struct frontswap_ops old_ops;
-
- old_ops = zcache_frontswap_register_ops();
- pr_info("zcache: frontswap enabled using kernel "
- "transcendent memory and zsmalloc\n");
- if (old_ops.init != NULL)
- pr_warning("zcache: frontswap_ops overridden");
- }
-#endif
-out:
- return ret;
-}
-
-module_init(zcache_init)
--
1.7.1
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