zuf-root is a pseudo FS that the zusd Server communicates through,
registers new file-systems. receives new mount requests.
In this patch we have the bring up of that special FS.
The principal communication with zuf-rootfs is done through
tmep-files + io-ctls.
Caller does an open(O_TMPFILE) and invokes some IOCTL_XXX on
the file. The specific ioctl establishes one of zuf_special_file
types object and attaches the object to the file-ptr and by that
defining special behavior for that object.
Otherwise zuf-rootfs is not an FS at all. It has a few viewable
variable files, exposing state and info about the system. In this
patch we can see the "state" variable-file, that denotes to user-mode
when the Kernel is ready for new mounts. And the registered_fs which
exposes what zufFS(s) where registered with the Kernel.
There is a one-to-one relationship between a zuf-root SB and
a zusd Server. Each zusd Server can support multiple zusFS
plugins and register multiple filesystem-types.
The zuf-rootfs (mount -t zuf) is usually mounted on
/sys/fs/zuf. The /sys/fs/zuf directory is automatically created
when zuf.ko is loaded. If an admin wants to run more zusd server
applications she/he can mount a second instance of -t zuf on some
dir and point the new zusd Server to it. (zusd has an optional path
argument). Otherwise a second instance attempting to communicate
with a busy zuf-root will fail.
TODO: How to trigger a first mount on module_load. Currently
admin needs to manually "mount -t zuf none /sys/fs/zuf"
Signed-off-by: Boaz Harrosh <boazh@xxxxxxxxxx>
---
fs/zuf/Makefile | 4 +
fs/zuf/_extern.h | 41 +++++
fs/zuf/_pr.h | 63 +++++++
fs/zuf/super.c | 53 ++++++
fs/zuf/zuf-core.c | 69 ++++++++
fs/zuf/zuf-root.c | 438 ++++++++++++++++++++++++++++++++++++++++++++++
fs/zuf/zuf.h | 116 ++++++++++++
fs/zuf/zus_api.h | 36 ++++
8 files changed, 820 insertions(+)
create mode 100644 fs/zuf/_extern.h
create mode 100644 fs/zuf/_pr.h
create mode 100644 fs/zuf/super.c
create mode 100644 fs/zuf/zuf-core.c
create mode 100644 fs/zuf/zuf-root.c
create mode 100644 fs/zuf/zuf.h
diff --git a/fs/zuf/Makefile b/fs/zuf/Makefile
index 452cec55f34d..b08c08e73faa 100644
--- a/fs/zuf/Makefile
+++ b/fs/zuf/Makefile
@@ -10,5 +10,9 @@
obj-$(CONFIG_ZUFS_FS) += zuf.o
+# ZUF core
+zuf-y += zuf-core.o zuf-root.o
+
# Main FS
+zuf-y += super.o
zuf-y += module.o
diff --git a/fs/zuf/_extern.h b/fs/zuf/_extern.h
new file mode 100644
index 000000000000..0e8aa52f1259
--- /dev/null
+++ b/fs/zuf/_extern.h
@@ -0,0 +1,41 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2018 NetApp Inc. All rights reserved.
+ *
+ * ZUFS-License: GPL-2.0. See module.c for LICENSE details.
+ *
+ * Authors:
+ * Boaz Harrosh <boazh@xxxxxxxxxx>
+ * Sagi Manole <sagim@xxxxxxxxxx>"
+ */
+
+#ifndef __ZUF_EXTERN_H__
+#define __ZUF_EXTERN_H__
+/*
+ * DO NOT INCLUDE this file directly, it is included by zuf.h
+ * It is here because zuf.h got to big
+ */
+
+/*
+ * extern functions declarations
+ */
+
+/* zuf-core.c */
+int zufc_zts_init(struct zuf_root_info *zri); /* Some private types in core */
+void zufc_zts_fini(struct zuf_root_info *zri);
+
+long zufc_ioctl(struct file *filp, unsigned int cmd, ulong arg);
+int zufc_release(struct inode *inode, struct file *file);
+int zufc_mmap(struct file *file, struct vm_area_struct *vma);
+
+/* zuf-root.c */
+int zufr_register_fs(struct super_block *sb, struct zufs_ioc_register_fs *rfs);
+
+/* super.c */
+int zuf_init_inodecache(void);
+void zuf_destroy_inodecache(void);
+
+struct dentry *zuf_mount(struct file_system_type *fs_type, int flags,
+ const char *dev_name, void *data);
+
+#endif /*ndef __ZUF_EXTERN_H__*/
diff --git a/fs/zuf/_pr.h b/fs/zuf/_pr.h
new file mode 100644
index 000000000000..51924b6bd2a5
--- /dev/null
+++ b/fs/zuf/_pr.h
@@ -0,0 +1,63 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2018 NetApp Inc. All rights reserved.
+ *
+ * ZUFS-License: GPL-2.0. See module.c for LICENSE details.
+ *
+ * Authors:
+ * Boaz Harrosh <boazh@xxxxxxxxxx>
+ * Sagi Manole <sagim@xxxxxxxxxx>"
+ */
+
+#ifndef __ZUF_PR_H__
+#define __ZUF_PR_H__
+
+#ifdef pr_fmt
+#undef pr_fmt
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#endif
+
+/*
+ * Debug code
+ */
+#define zuf_err(s, args ...) pr_err("[%s:%d] " s, __func__, \
+ __LINE__, ## args)
+#define zuf_err_cnd(silent, s, args ...) \
+ do {if (!silent) \
+ pr_err("[%s:%d] " s, __func__, __LINE__, ## args); \
+ } while (0)
+#define zuf_warn(s, args ...) pr_warn("[%s:%d] " s, __func__, \
+ __LINE__, ## args)
+#define zuf_warn_cnd(silent, s, args ...) \
+ do {if (!silent) \
+ pr_warn("[%s:%d] " s, __func__, __LINE__, ## args); \
+ } while (0)
+#define zuf_info(s, args ...) pr_info("~info~ " s, ## args)
+
+#define zuf_chan_debug(c, s, args...) pr_debug(c " [%s:%d] " s, __func__, \
+ __LINE__, ## args)
+
+/* ~~~ channel prints ~~~ */
+#define zuf_dbg_perf(s, args ...) zuf_chan_debug("perfo", s, ##args)
+#define zuf_dbg_err(s, args ...) zuf_chan_debug("error", s, ##args)
+#define zuf_dbg_vfs(s, args ...) zuf_chan_debug("vfs ", s, ##args)
+#define zuf_dbg_rw(s, args ...) zuf_chan_debug("rw ", s, ##args)
+#define zuf_dbg_t1(s, args ...) zuf_chan_debug("t1 ", s, ##args)
+#define zuf_dbg_xattr(s, args ...) zuf_chan_debug("xattr", s, ##args)
+#define zuf_dbg_acl(s, args ...) zuf_chan_debug("acl ", s, ##args)
+#define zuf_dbg_t2(s, args ...) zuf_chan_debug("t2dbg", s, ##args)
+#define zuf_dbg_t2_rw(s, args ...) zuf_chan_debug("t2grw", s, ##args)
+#define zuf_dbg_core(s, args ...) zuf_chan_debug("core ", s, ##args)
+#define zuf_dbg_mmap(s, args ...) zuf_chan_debug("mmap ", s, ##args)
+#define zuf_dbg_zus(s, args ...) zuf_chan_debug("zusdg", s, ##args)
+#define zuf_dbg_verbose(s, args ...) zuf_chan_debug("d-oto", s, ##args)
+
+#define md_err zuf_err
+#define md_warn zuf_warn
+#define md_err_cnd zuf_err_cnd
+#define md_warn_cnd zuf_warn_cnd
+#define md_dbg_err zuf_dbg_err
+#define md_dbg_verbose zuf_dbg_verbose
+
+
+#endif /* define __ZUF_PR_H__ */
diff --git a/fs/zuf/super.c b/fs/zuf/super.c
new file mode 100644
index 000000000000..f7f7798425a9
--- /dev/null
+++ b/fs/zuf/super.c
@@ -0,0 +1,53 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Super block operations.
+ *
+ * Copyright (c) 2018 NetApp Inc. All rights reserved.
+ *
+ * ZUFS-License: GPL-2.0. See module.c for LICENSE details.
+ *
+ * Authors:
+ * Boaz Harrosh <boazh@xxxxxxxxxx>
+ * Sagi Manole <sagim@xxxxxxxxxx>
+ */
+
+#include <linux/types.h>
+#include <linux/parser.h>
+#include <linux/statfs.h>
+#include <linux/backing-dev.h>
+
+#include "zuf.h"
+
+static struct kmem_cache *zuf_inode_cachep;
+
+static void _init_once(void *foo)
+{
+ struct zuf_inode_info *zii = foo;
+
+ inode_init_once(&zii->vfs_inode);
+}
+
+int __init zuf_init_inodecache(void)
+{
+ zuf_inode_cachep = kmem_cache_create("zuf_inode_cache",
+ sizeof(struct zuf_inode_info),
+ 0,
+ (SLAB_RECLAIM_ACCOUNT |
+ SLAB_MEM_SPREAD |
+ SLAB_TYPESAFE_BY_RCU),
+ _init_once);
+ if (zuf_inode_cachep == NULL)
+ return -ENOMEM;
+ return 0;
+}
+
+void zuf_destroy_inodecache(void)
+{
+ kmem_cache_destroy(zuf_inode_cachep);
+}
+
+struct dentry *zuf_mount(struct file_system_type *fs_type, int flags,
+ const char *dev_name, void *data)
+{
+ return ERR_PTR(-ENOTSUPP);
+}
diff --git a/fs/zuf/zuf-core.c b/fs/zuf/zuf-core.c
new file mode 100644
index 000000000000..c9bb31f75bed
--- /dev/null
+++ b/fs/zuf/zuf-core.c
@@ -0,0 +1,69 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * BRIEF DESCRIPTION
+ *
+ * Ioctl operations.
+ *
+ * Copyright (c) 2018 NetApp Inc. All rights reserved.
+ *
+ * ZUFS-License: GPL-2.0. See module.c for LICENSE details.
+ *
+ * Authors:
+ * Boaz Harrosh <boazh@xxxxxxxxxx>
+ */
+
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/mm_types.h>
+#include <linux/delay.h>
+#include <linux/pfn_t.h>
+#include <linux/sched/signal.h>
+
+#include "zuf.h"
+
+int zufc_zts_init(struct zuf_root_info *zri)
+{
+ return 0;
+}
+
+void zufc_zts_fini(struct zuf_root_info *zri)
+{
+}
+
+long zufc_ioctl(struct file *file, unsigned int cmd, ulong arg)
+{
+ switch (cmd) {
+ default:
+ zuf_err("%d\n", cmd);
+ return -ENOTTY;
+ }
+}
+
+int zufc_release(struct inode *inode, struct file *file)
+{
+ struct zuf_special_file *zsf = file->private_data;
+
+ if (!zsf)
+ return 0;
+
+ switch (zsf->type) {
+ default:
+ return 0;
+ }
+}
+
+int zufc_mmap(struct file *file, struct vm_area_struct *vma)
+{
+ struct zuf_special_file *zsf = file->private_data;
+
+ if (unlikely(!zsf)) {
+ zuf_err("Which mmap is that !!!!\n");
+ return -ENOTTY;
+ }
+
+ switch (zsf->type) {
+ default:
+ zuf_err("type=%d\n", zsf->type);
+ return -ENOTTY;
+ }
+}
diff --git a/fs/zuf/zuf-root.c b/fs/zuf/zuf-root.c
new file mode 100644
index 000000000000..ea7eb810ea9d
--- /dev/null
+++ b/fs/zuf/zuf-root.c
@@ -0,0 +1,438 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ZUF Root filesystem.
+ *
+ * Copyright (c) 2018 NetApp Inc. All rights reserved.
+ *
+ * ZUS-ZUF interaction is done via a small specialized FS that
+ * provides the communication with the mount-thread, ZTs, pmem devices,
+ * and so on ...
+ * Subsequently all FS super_blocks are children of this root, and point
+ * to it. All sharing the same zuf communication channels.
+ *
+ * Authors:
+ * Boaz Harrosh <boazh@xxxxxxxxxx>
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/magic.h>
+#include <asm-generic/mman.h>
+
+#include "zuf.h"
+
+/* ~~~~ Register/Unregister FS-types ~~~~ */
+#ifdef CONFIG_LOCKDEP
+
+/*
+ * NOTE: When CONFIG_LOCKDEP is on. register_filesystem() complains when
+ * the fstype object is from a kmalloc. Because of some lockdep_keys not
+ * being const_obj something.
+ *
+ * So in this case we have maximum of 16 fstypes system wide
+ * (Total for all mounted zuf_root(s)). This way we can have them
+ * in const_obj memory below at g_fs_array
+ */
+
+enum { MAX_LOCKDEP_FSs = 16 };
+static uint g_fs_next;
+static struct zuf_fs_type g_fs_array[MAX_LOCKDEP_FSs];
+
+static struct zuf_fs_type *_fs_type_alloc(void)
+{
+ struct zuf_fs_type *ret;
+
+ if (MAX_LOCKDEP_FSs <= g_fs_next)
+ return NULL;
+
+ ret = &g_fs_array[g_fs_next++];
+ memset(ret, 0, sizeof(*ret));
+ return ret;
+}
+
+static void _fs_type_free(struct zuf_fs_type *zft)
+{
+ if (zft == &g_fs_array[0])
+ g_fs_next = 0;
+}
+
+#else /* !CONFIG_LOCKDEP*/
+static struct zuf_fs_type *_fs_type_alloc(void)
+{
+ return kcalloc(1, sizeof(struct zuf_fs_type), GFP_KERNEL);
+}
+
+static void _fs_type_free(struct zuf_fs_type *zft)
+{
+ kfree(zft);
+}
+#endif /*CONFIG_LOCKDEP*/
+
+
+static ssize_t _state_read(struct file *file, char __user *buf, size_t len,
+ loff_t *ppos)
+{
+ struct zuf_root_info *zri = ZRI(file->f_inode->i_sb);
+ const char *msg;
+
+ if (*ppos > 0)
+ return 0;
+
+ switch (zri->state) {
+ case ZUF_ROOT_INITIALIZING:
+ msg = "initializing\n";
+ break;
+ case ZUF_ROOT_REGISTERING_FS:
+ msg = "registering_fs\n";
+ break;
+ case ZUF_ROOT_MOUNT_READY:
+ msg = "mount_ready\n";
+ break;
+ case ZUF_ROOT_SERVER_FAILED:
+ msg = "server_failed\n";
+ break;
+ default:
+ msg = "UNKNOWN\n";
+ break;
+ }
+
+ return simple_read_from_buffer(buf, len, ppos, msg, strlen(msg));
+}
+
+static const struct file_operations _state_ops = {
+ .open = nonseekable_open,
+ .read = _state_read,
+ .llseek = no_llseek,
+};
+
+static ssize_t _registered_fs_read(struct file *file, char __user *buf,
+ size_t len, loff_t *ppos)
+{
+ struct zuf_root_info *zri = ZRI(file->f_inode->i_sb);
+ size_t buff_len = 0;
+ struct zuf_fs_type *zft;
+ char *fs_buff, *p;
+ ssize_t ret;
+ size_t name_len;
+
+ list_for_each_entry(zft, &zri->fst_list, list)
+ buff_len += strlen(zft->rfi.fsname) + 1;
+
+ if (unlikely(*ppos > buff_len))
+ return -EINVAL;
+ if (*ppos == buff_len)
+ return 0;
+
+ fs_buff = kzalloc(buff_len + 1, GFP_KERNEL);
+ if (unlikely(!fs_buff))
+ return -ENOMEM;
+
+ p = fs_buff;
+ list_for_each_entry(zft, &zri->fst_list, list) {
+ if (p != fs_buff) {
+ *p = ' ';
+ ++p;
+ }
+ name_len = strlen(zft->rfi.fsname);
+ memcpy(p, zft->rfi.fsname, name_len);
+ p += name_len;
+ }
+
+ p = fs_buff + *ppos;
+ buff_len = buff_len - *ppos;
+ ret = simple_read_from_buffer(buf, len, ppos, p, buff_len);
+ kfree(fs_buff);
+
+ return ret;
+}
+
+static const struct file_operations _registered_fs_ops = {
+ .open = nonseekable_open,
+ .read = _registered_fs_read,
+ .llseek = no_llseek,
+};
+
+
+int zufr_register_fs(struct super_block *sb, struct zufs_ioc_register_fs *rfs)
+{
+ struct zuf_fs_type *zft = _fs_type_alloc();
+ struct zuf_root_info *zri = ZRI(sb);
+
+ if (unlikely(!zft))
+ return -ENOMEM;
+
+ if (zri->state == ZUF_ROOT_INITIALIZING)
+ zri->state = ZUF_ROOT_REGISTERING_FS;
+
+ /* Original vfs file type */
+ zft->vfs_fst.owner = THIS_MODULE;
+ zft->vfs_fst.name = kstrdup(rfs->rfi.fsname, GFP_KERNEL);
+ zft->vfs_fst.mount = zuf_mount;
+ zft->vfs_fst.kill_sb = kill_block_super;
+
+ /* ZUS info about this FS */
+ zft->rfi = rfs->rfi;
+ zft->zus_zfi = rfs->zus_zfi;
+ INIT_LIST_HEAD(&zft->list);
+ /* Back pointer to our communication channels */
+ zft->zri = ZRI(sb);
+
+ zuf_add_fs_type(zft->zri, zft);
+ zuf_info("register_filesystem [%s]\n", zft->vfs_fst.name);
+ return register_filesystem(&zft->vfs_fst);
+}
+
+static void _unregister_all_fses(struct zuf_root_info *zri)
+{
+ struct zuf_fs_type *zft, *n;
+
+ list_for_each_entry_safe_reverse(zft, n, &zri->fst_list, list) {
+ unregister_filesystem(&zft->vfs_fst);
+ list_del_init(&zft->list);
+ _fs_type_free(zft);
+ }
+}
+
+static int zufr_unlink(struct inode *dir, struct dentry *dentry)
+{
+ struct inode *inode = dentry->d_inode;
+
+ drop_nlink(inode);
+ return 0;
+}
+
+/* Force alignment of 2M for all vma(s)
+ *
+ * This belongs to t1.c and what it does for mmap. But we do not mind
+ * that both our mmaps (grab_pmem or ZTs) will be 2M aligned so keep
+ * it here. And zus mappings just all match perfectly with no need for
+ * holes.
+ * FIXME: This is copy/paste from dax-device. It can be very much simplified
+ * for what we need.
+ */
+static unsigned long zufr_get_unmapped_area(struct file *filp,
+ unsigned long addr, unsigned long len, unsigned long pgoff,
+ unsigned long flags)
+{
+ unsigned long off, off_end, off_align, len_align, addr_align;
+ unsigned long align = PMD_SIZE;
+
+ if (addr)
+ goto out;
+
+ off = pgoff << PAGE_SHIFT;
+ off_end = off + len;
+ off_align = round_up(off, align);
+
+ if ((off_end <= off_align) || ((off_end - off_align) < align))
+ goto out;
+
+ len_align = len + align;
+ if ((off + len_align) < off)
+ goto out;
+
+ addr_align = current->mm->get_unmapped_area(filp, addr, len_align,
+ pgoff, flags);
+ if (!IS_ERR_VALUE(addr_align)) {
+ addr_align += (off - addr_align) & (align - 1);
+ return addr_align;
+ }
+ out:
+ return current->mm->get_unmapped_area(filp, addr, len, pgoff, flags);
+}
+
+static const struct inode_operations zufr_inode_operations;
+static const struct file_operations zufr_file_dir_operations = {
+ .open = dcache_dir_open,
+ .release = dcache_dir_close,
+ .llseek = dcache_dir_lseek,
+ .read = generic_read_dir,
+ .iterate_shared = dcache_readdir,
+ .fsync = noop_fsync,
+ .unlocked_ioctl = zufc_ioctl,
+};
+static const struct file_operations zufr_file_reg_operations = {
+ .fsync = noop_fsync,
+ .unlocked_ioctl = zufc_ioctl,
+ .get_unmapped_area = zufr_get_unmapped_area,
+ .mmap = zufc_mmap,
+ .release = zufc_release,
+};
+
+static int zufr_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
+{
+ struct zuf_root_info *zri = ZRI(dir->i_sb);
+ struct inode *inode;
+ int err;
+
+ inode = new_inode(dir->i_sb);
+ if (!inode)
+ return -ENOMEM;
+
+ /* We need to impersonate device-dax (S_DAX + S_IFCHR) in order to get
+ * the PMD (huge) page faults and allow RDMA memory access via GUP
+ * (get_user_pages_longterm).
+ */
+ inode->i_flags = S_DAX;
+ mode = (mode & ~S_IFREG) | S_IFCHR; /* change file type to char */
+
+ inode->i_ino = ++zri->next_ino; /* none atomic only one mount thread */
+ inode->i_blocks = inode->i_size = 0;
+ inode->i_ctime = inode->i_mtime = current_time(inode);
+ inode->i_atime = inode->i_ctime;
+ inode_init_owner(inode, dir, mode);
+
+ inode->i_op = &zufr_inode_operations;
+ inode->i_fop = &zufr_file_reg_operations;
+
+ err = insert_inode_locked(inode);
+ if (unlikely(err)) {
+ zuf_err("[%ld] insert_inode_locked => %d\n", inode->i_ino, err);
+ goto fail;
+ }
+ d_tmpfile(dentry, inode);
+ unlock_new_inode(inode);
+ return 0;
+
+fail:
+ clear_nlink(inode);
+ make_bad_inode(inode);
+ iput(inode);
+ return err;
+}
+
+static void zufr_put_super(struct super_block *sb)
+{
+ struct zuf_root_info *zri = ZRI(sb);
+
+ zufc_zts_fini(zri);
+ _unregister_all_fses(zri);
+
+ zuf_info("zuf_root umount\n");
+}
+
+static void zufr_evict_inode(struct inode *inode)
+{
+ clear_inode(inode);
+}
+
+static const struct inode_operations zufr_inode_operations = {
+ .lookup = simple_lookup,
+
+ .tmpfile = zufr_tmpfile,
+ .unlink = zufr_unlink,
+};
+static const struct super_operations zufr_super_operations = {
+ .statfs = simple_statfs,
+
+ .evict_inode = zufr_evict_inode,
+ .put_super = zufr_put_super,
+};
+
+#define ZUFR_SUPER_MAGIC 0x1717
+
+static int zufr_fill_super(struct super_block *sb, void *data, int silent)
+{
+ static struct tree_descr zufr_files[] = {
+ [2] = {"state", &_state_ops, S_IFREG | 0400},
+ [3] = {"registered_fs", &_registered_fs_ops, S_IFREG | 0400},
+ {""},
+ };
+ struct zuf_root_info *zri;
+ struct inode *root_i;
+ int err;
+
+ zri = kzalloc(sizeof(*zri), GFP_KERNEL);
+ if (!zri) {
+ zuf_err_cnd(silent,
+ "Not enough memory to allocate zuf_root_info\n");
+ return -ENOMEM;
+ }
+
+ err = simple_fill_super(sb, ZUFR_SUPER_MAGIC, zufr_files);
+ if (unlikely(err)) {
+ kfree(zri);
+ return err;
+ }
+
+ sb->s_op = &zufr_super_operations;
+ sb->s_fs_info = zri;
+ zri->sb = sb;
+
+ root_i = sb->s_root->d_inode;
+ root_i->i_fop = &zufr_file_dir_operations;
+ root_i->i_op = &zufr_inode_operations;
+
+ mutex_init(&zri->sbl_lock);
+ INIT_LIST_HEAD(&zri->fst_list);
+
+ err = zufc_zts_init(zri);
+ if (unlikely(err))
+ return err; /* put will be called we have a root */
+
+ return 0;
+}
+
+static struct dentry *zufr_mount(struct file_system_type *fs_type,
+ int flags, const char *dev_name,
+ void *data)
+{
+ struct dentry *ret = mount_nodev(fs_type, flags, data, zufr_fill_super);
+
+ if (IS_ERR_OR_NULL(ret)) {
+ zuf_dbg_err("mount_nodev(%s, %s) => %ld\n", dev_name,
+ (char *)data, PTR_ERR(ret));
+ return ret;
+ }
+
+ zuf_info("zuf_root mount [%s]\n", dev_name);
+ return ret;
+}
+
+static struct file_system_type zufr_type = {
+ .owner = THIS_MODULE,
+ .name = "zuf",
+ .mount = zufr_mount,
+ .kill_sb = kill_litter_super,
+};
+
+/* Create an /sys/fs/zuf/ directory. to mount on */
+static struct kset *zufr_kset;
+
+int __init zuf_root_init(void)
+{
+ int err = zuf_init_inodecache();
+
+ if (unlikely(err))
+ return err;
+
+ zufr_kset = kset_create_and_add("zuf", NULL, fs_kobj);
+ if (!zufr_kset) {
+ err = -ENOMEM;
+ goto un_inodecache;
+ }
+
+ err = register_filesystem(&zufr_type);
+ if (unlikely(err))
+ goto un_kset;
+
+ return 0;
+
+un_kset:
+ kset_unregister(zufr_kset);
+un_inodecache:
+ zuf_destroy_inodecache();
+ return err;
+}
+
+static void __exit zuf_root_exit(void)
+{
+ unregister_filesystem(&zufr_type);
+ kset_unregister(zufr_kset);
+ zuf_destroy_inodecache();
+}
+
+module_init(zuf_root_init)
+module_exit(zuf_root_exit)
diff --git a/fs/zuf/zuf.h b/fs/zuf/zuf.h
new file mode 100644
index 000000000000..919b84f7478f
--- /dev/null
+++ b/fs/zuf/zuf.h
@@ -0,0 +1,116 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * BRIEF DESCRIPTION
+ *
+ * Definitions for the ZUF filesystem.
+ *
+ * Copyright (c) 2018 NetApp Inc. All rights reserved.
+ *
+ * ZUFS-License: GPL-2.0. See module.c for LICENSE details.
+ *
+ * Authors:
+ * Boaz Harrosh <boazh@xxxxxxxxxx>
+ * Sagi Manole <sagim@xxxxxxxxxx>"
+ */
+
+#ifndef __ZUF_H
+#define __ZUF_H
+
+#include <linux/sched.h>
+#include <linux/fs.h>
+#include <linux/list.h>
+#include <linux/types.h>
+#include <linux/xattr.h>
+#include <linux/exportfs.h>
+#include <linux/page_ref.h>
+#include <linux/mm.h>
+
+#include "zus_api.h"
+
+#include "_pr.h"
+
+enum zlfs_e_special_file {
+ zlfs_e_zt = 1,
+ zlfs_e_mout_thread,
+ zlfs_e_pmem,
+ zlfs_e_dpp_buff,
+ zlfs_e_private_mount,
+};
+
+struct zuf_special_file {
+ enum zlfs_e_special_file type;
+ struct file *file;
+};
+
+struct zuf_private_mount_info {
+ struct zuf_special_file zsf;
+ struct super_block *sb;
+};
+
+enum {
+ ZUF_ROOT_INITIALIZING = 0,
+ ZUF_ROOT_REGISTERING_FS = 1,
+ ZUF_ROOT_MOUNT_READY = 2,
+ ZUF_ROOT_SERVER_FAILED = 3, /* server crashed unexpectedly */
+};
+
+/* This is the zuf-root.c mini filesystem */
+struct zuf_root_info {
+ #define SBL_INC 64
+ struct sb_is_list {
+ uint num;
+ uint max;
+ struct super_block **array;
+ } sbl;
+ struct mutex sbl_lock;
+
+ ulong next_ino;
+
+ /* The definition of _ztp is private to zuf-core.c */
+ struct zuf_threads_pool *_ztp;
+
+ struct super_block *sb;
+ struct list_head fst_list;
+ int state;
+};
+
+static inline struct zuf_root_info *ZRI(struct super_block *sb)
+{
+ struct zuf_root_info *zri = sb->s_fs_info;
+
+ WARN_ON(zri->sb != sb);
+ return zri;
+}
+
+struct zuf_fs_type {
+ struct file_system_type vfs_fst;
+ struct zus_fs_info *zus_zfi;
+ struct register_fs_info rfi;
+ struct zuf_root_info *zri;
+
+ struct list_head list;
+};
+
+static inline void zuf_add_fs_type(struct zuf_root_info *zri,
+ struct zuf_fs_type *zft)
+{
+ /* Unlocked for now only one mount-thread with zus */
+ list_add(&zft->list, &zri->fst_list);
+}
+
+/*
+ * ZUF per-inode data in memory
+ */
+struct zuf_inode_info {
+ struct inode vfs_inode;
+};
+
+static inline struct zuf_inode_info *ZUII(struct inode *inode)
+{
+ return container_of(inode, struct zuf_inode_info, vfs_inode);
+}
+
+/* Keep this include last thing in file */
+#include "_extern.h"
+
+#endif /* __ZUF_H */
diff --git a/fs/zuf/zus_api.h b/fs/zuf/zus_api.h
index 069153fc0b96..f293e03460be 100644
--- a/fs/zuf/zus_api.h
+++ b/fs/zuf/zus_api.h
@@ -93,4 +93,40 @@
#endif /* ndef __KERNEL__ */
+struct zufs_ioc_hdr {
+ __s32 err; /* IN/OUT must be first */
+ __u16 in_len; /* How much to be copied *to* zus */
+ __u16 out_max; /* Max receive buffer at dispatch caller */
+ __u16 out_start;/* Start of output parameters (to caller) */
+ __u16 out_len; /* How much to be copied *from* zus to caller */
+ /* can be modified by zus */
+ __u16 operation;/* One of e_zufs_operation */
+ __u16 flags; /* e_zufs_hdr_flags bit flags */
+ __u32 offset; /* Start of user buffer in ZT mmap */
+ __u32 len; /* Len of user buffer in ZT mmap */
+};
+
+struct register_fs_info {
+ char fsname[16]; /* Only 4 chars and a NUL please */
+ __u32 FS_magic; /* This is the FS's version && magic */
+ __u32 FS_ver_major; /* on disk, not the zuf-to-zus version*/
+ __u32 FS_ver_minor; /* (See also struct md_dev_table) */
+ __u32 notused;
+
+ __u64 dt_offset;
+ __u64 s_maxbytes;
+ __u32 s_time_gran;
+ __u32 def_mode;
+};
+
+/* Register FS */
+/* A cookie from user-mode given in register_fs_info */
+struct zus_fs_info;
+struct zufs_ioc_register_fs {
+ struct zufs_ioc_hdr hdr;
+ struct zus_fs_info *zus_zfi;
+ struct register_fs_info rfi;
+};
+#define ZU_IOC_REGISTER_FS _IOWR('Z', 10, struct zufs_ioc_register_fs)
+
#endif /* _LINUX_ZUFS_API_H */
--
2.21.0
