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btrfs: Update existing btrfs_device for renaming device 

When we scan devices in a multi-device filesystem, we memorize the original
name.  If the device gets a new name, later scans don't update the
in-kernel structures related to it, and we're not able to mount the
filesystem.

This patch updates device name during scaning.

Signed-off-by: TARUISI Hiroaki <taruishi.hiroak@jp.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
TARUISI Hiroaki 2010-02-09 06:36:45 +00:00 committed by Chris Mason
parent 1e701a3292
commit 3a0524dc05
1 changed files with 7 additions and 0 deletions
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7
fs/btrfs/volumes.c
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@ -365,6 +365,7 @@ static noinline int device_list_add(const char *path,
struct btrfs_device *device;
struct btrfs_fs_devices *fs_devices;
u64 found_transid = btrfs_super_generation(disk_super);
char *name;
fs_devices = find_fsid(disk_super->fsid);
if (!fs_devices) {
@ -411,6 +412,12 @@ static noinline int device_list_add(const char *path,
device->fs_devices = fs_devices;
fs_devices->num_devices++;
} else if (strcmp(device->name, path)) {
name = kstrdup(path, GFP_NOFS);
if (!name)
return -ENOMEM;
kfree(device->name);
device->name = name;
}
if (found_transid > fs_devices->latest_trans) {