From: Fred Isaman <iisaman@xxxxxxxxxxxxxx>
Call GETDEVICELIST during mount, then call and parse GETDEVICEINFO
for each device returned.
[pnfsblock: get rid of deprecated xdr macros]
Signed-off-by: Jim Rees <rees@xxxxxxxxx>
[pnfsblock: fix pnfs_deviceid references]
Signed-off-by: Fred Isaman <iisaman@xxxxxxxxxxxxxx>
[pnfsblock: fix print format warnings for sector_t and size_t]
[pnfs-block: #include <linux/vmalloc.h>]
[pnfsblock: no PNFS_NFS_SERVER]
Signed-off-by: Benny Halevy <bhalevy@xxxxxxxxxxx>
[pnfsblock: fix bug determining size of striped volume]
[pnfsblock: fix oops when using multiple devices]
Signed-off-by: Fred Isaman <iisaman@xxxxxxxxxxxxxx>
Signed-off-by: Benny Halevy <bhalevy@xxxxxxxxxxx>
Signed-off-by: Benny Halevy <benny@xxxxxxxxxx>
---
fs/nfs/blocklayout/blocklayout.c | 156 +++++++++++++++++++++++++++++++++++++-
fs/nfs/blocklayout/blocklayout.h | 53 +++++++++++++-
2 files changed, 207 insertions(+), 2 deletions(-)
diff --git a/fs/nfs/blocklayout/blocklayout.c b/fs/nfs/blocklayout/blocklayout.c
index fce66a9..01d85cf 100644
--- a/fs/nfs/blocklayout/blocklayout.c
+++ b/fs/nfs/blocklayout/blocklayout.c
@@ -33,6 +33,7 @@
#include <linux/init.h>
#include <linux/mount.h>
#include <linux/namei.h>
+#include <linux/vmalloc.h>
#include "blocklayout.h"
@@ -163,17 +164,170 @@ bl_cleanup_layoutcommit(struct pnfs_layout_hdr *lo,
{
}
+static void free_blk_mountid(struct block_mount_id *mid)
+{
+ if (mid) {
+ struct pnfs_block_dev *dev;
+ spin_lock(&mid->bm_lock);
+ while (!list_empty(&mid->bm_devlist)) {
+ dev = list_first_entry(&mid->bm_devlist,
+ struct pnfs_block_dev,
+ bm_node);
+ list_del(&dev->bm_node);
+ free_block_dev(dev);
+ }
+ spin_unlock(&mid->bm_lock);
+ kfree(mid);
+ }
+}
+
+/* This is mostly copied from the filelayout's get_device_info function.
+ * It seems much of this should be at the generic pnfs level.
+ */
+static struct pnfs_block_dev *
+nfs4_blk_get_deviceinfo(struct nfs_server *server, const struct nfs_fh *fh,
+ struct nfs4_deviceid *d_id,
+ struct list_head *sdlist)
+{
+ struct pnfs_device *dev;
+ struct pnfs_block_dev *rv = NULL;
+ u32 max_resp_sz;
+ int max_pages;
+ struct page **pages = NULL;
+ int i, rc;
+
+ /*
+ * Use the session max response size as the basis for setting
+ * GETDEVICEINFO's maxcount
+ */
+ max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
+ max_pages = max_resp_sz >> PAGE_SHIFT;
+ dprintk("%s max_resp_sz %u max_pages %d\n",
+ __func__, max_resp_sz, max_pages);
+
+ dev = kmalloc(sizeof(*dev), GFP_NOFS);
+ if (!dev) {
+ dprintk("%s kmalloc failed\n", __func__);
+ return NULL;
+ }
+
+ pages = kzalloc(max_pages * sizeof(struct page *), GFP_NOFS);
+ if (pages == NULL) {
+ kfree(dev);
+ return NULL;
+ }
+ for (i = 0; i < max_pages; i++) {
+ pages[i] = alloc_page(GFP_NOFS);
+ if (!pages[i])
+ goto out_free;
+ }
+
+ /* set dev->area */
+ dev->area = vmap(pages, max_pages, VM_MAP, PAGE_KERNEL);
+ if (!dev->area)
+ goto out_free;
+
+ memcpy(&dev->dev_id, d_id, sizeof(*d_id));
+ dev->layout_type = LAYOUT_BLOCK_VOLUME;
+ dev->pages = pages;
+ dev->pgbase = 0;
+ dev->pglen = PAGE_SIZE * max_pages;
+ dev->mincount = 0;
+
+ dprintk("%s: dev_id: %s\n", __func__, dev->dev_id.data);
+ rc = nfs4_proc_getdeviceinfo(server, dev);
+ dprintk("%s getdevice info returns %d\n", __func__, rc);
+ if (rc)
+ goto out_free;
+
+ rv = nfs4_blk_decode_device(server, dev, sdlist);
+ out_free:
+ if (dev->area != NULL)
+ vunmap(dev->area);
+ for (i = 0; i < max_pages; i++)
+ __free_page(pages[i]);
+ kfree(pages);
+ kfree(dev);
+ return rv;
+}
+
static int
bl_set_layoutdriver(struct nfs_server *server, const struct nfs_fh *fh)
{
+ struct block_mount_id *b_mt_id = NULL;
+ struct pnfs_mount_type *mtype = NULL;
+ struct pnfs_devicelist *dlist = NULL;
+ struct pnfs_block_dev *bdev;
+ LIST_HEAD(block_disklist);
+ int status = 0, i;
+
dprintk("%s enter\n", __func__);
- return 0;
+
+ if (server->pnfs_blksize == 0) {
+ dprintk("%s Server did not return blksize\n", __func__);
+ return -EINVAL;
+ }
+ b_mt_id = kzalloc(sizeof(struct block_mount_id), GFP_NOFS);
+ if (!b_mt_id) {
+ status = -ENOMEM;
+ goto out_error;
+ }
+ /* Initialize nfs4 block layout mount id */
+ spin_lock_init(&b_mt_id->bm_lock);
+ INIT_LIST_HEAD(&b_mt_id->bm_devlist);
+
+ dlist = kmalloc(sizeof(struct pnfs_devicelist), GFP_NOFS);
+ if (!dlist) {
+ status = -ENOMEM;
+ goto out_error;
+ }
+ dlist->eof = 0;
+ while (!dlist->eof) {
+ status = nfs4_proc_getdevicelist(server, fh, dlist);
+ if (status)
+ goto out_error;
+ dprintk("%s GETDEVICELIST numdevs=%i, eof=%i\n",
+ __func__, dlist->num_devs, dlist->eof);
+ /* For each device returned in dlist, call GETDEVICEINFO, and
+ * decode the opaque topology encoding to create a flat
+ * volume topology, matching VOLUME_SIMPLE disk signatures
+ * to disks in the visible block disk list.
+ * Construct an LVM meta device from the flat volume topology.
+ */
+ for (i = 0; i < dlist->num_devs; i++) {
+ bdev = nfs4_blk_get_deviceinfo(server, fh,
+ &dlist->dev_id[i],
+ &block_disklist);
+ if (!bdev) {
+ status = -ENODEV;
+ goto out_error;
+ }
+ spin_lock(&b_mt_id->bm_lock);
+ list_add(&bdev->bm_node, &b_mt_id->bm_devlist);
+ spin_unlock(&b_mt_id->bm_lock);
+ }
+ }
+ dprintk("%s SUCCESS\n", __func__);
+ server->pnfs_ld_data = b_mt_id;
+
+ out_return:
+ kfree(dlist);
+ return status;
+
+ out_error:
+ free_blk_mountid(b_mt_id);
+ kfree(mtype);
+ goto out_return;
}
static int
bl_clear_layoutdriver(struct nfs_server *server)
{
+ struct block_mount_id *b_mt_id = server->pnfs_ld_data;
+
dprintk("%s enter\n", __func__);
+ free_blk_mountid(b_mt_id);
+ dprintk("%s RETURNS\n", __func__);
return 0;
}
diff --git a/fs/nfs/blocklayout/blocklayout.h b/fs/nfs/blocklayout/blocklayout.h
index d2d564a..ee402c7 100644
--- a/fs/nfs/blocklayout/blocklayout.h
+++ b/fs/nfs/blocklayout/blocklayout.h
@@ -38,12 +38,60 @@
#include "../pnfs.h"
+struct block_mount_id {
+ spinlock_t bm_lock; /* protects list */
+ struct list_head bm_devlist; /* holds pnfs_block_dev */
+};
+
struct pnfs_block_dev {
struct list_head bm_node;
struct nfs4_deviceid bm_mdevid; /* associated devid */
struct block_device *bm_mdev; /* meta device itself */
};
+/* holds visible disks that can be matched against VOLUME_SIMPLE signatures */
+struct visible_block_device {
+ struct list_head vi_node;
+ struct block_device *vi_bdev;
+ int vi_mapped;
+ int vi_put_done;
+};
+
+enum blk_vol_type {
+ PNFS_BLOCK_VOLUME_SIMPLE = 0, /* maps to a single LU */
+ PNFS_BLOCK_VOLUME_SLICE = 1, /* slice of another volume */
+ PNFS_BLOCK_VOLUME_CONCAT = 2, /* concatenation of multiple volumes */
+ PNFS_BLOCK_VOLUME_STRIPE = 3 /* striped across multiple volumes */
+};
+
+/* All disk offset/lengths are stored in 512-byte sectors */
+struct pnfs_blk_volume {
+ uint32_t bv_type;
+ sector_t bv_size;
+ struct pnfs_blk_volume **bv_vols;
+ int bv_vol_n;
+ union {
+ dev_t bv_dev;
+ sector_t bv_stripe_unit;
+ sector_t bv_offset;
+ };
+};
+
+/* Since components need not be aligned, cannot use sector_t */
+struct pnfs_blk_sig_comp {
+ int64_t bs_offset; /* In bytes */
+ uint32_t bs_length; /* In bytes */
+ char *bs_string;
+};
+
+/* Maximum number of signatures components in a simple volume */
+# define PNFS_BLOCK_MAX_SIG_COMP 16
+
+struct pnfs_blk_sig {
+ int si_num_comps;
+ struct pnfs_blk_sig_comp si_comps[PNFS_BLOCK_MAX_SIG_COMP];
+};
+
enum exstate4 {
PNFS_BLOCK_READWRITE_DATA = 0,
PNFS_BLOCK_READ_DATA = 1,
@@ -99,7 +147,10 @@ struct pnfs_block_layout {
sector_t bl_blocksize; /* Server blocksize in sectors */
};
-static inline struct pnfs_block_layout *BLK_LO2EXT(struct pnfs_layout_hdr *lo)
+#define BLK_ID(lo) ((struct block_mount_id *)(NFS_SERVER(lo->plh_inode)->pnfs_ld_data))
+
+static inline struct pnfs_block_layout *
+BLK_LO2EXT(struct pnfs_layout_hdr *lo)
{
return container_of(lo, struct pnfs_block_layout, bl_layout);
}
--
1.7.4.1
--
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