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btrfs: create sprout should rename fsid on the sysfs as well 

Creating sprout will change the fsid of the mounted root.
do the same on the sysfs as well.

reproducer:
 mount /dev/sdb /btrfs (seed disk)
 btrfs dev add /dev/sdc /btrfs
 mount -o rw,remount /btrfs
 btrfs dev del /dev/sdb /btrfs
 mount /dev/sdb /btrfs

Error:
kobject_add_internal failed for fe350492-dc28-4051-a601-e017b17e6145 with -EEXIST, don't try to register things with the same name in the same directory.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Anand Jain 2014-06-03 11:36:03 +08:00 committed by Chris Mason
parent 49c6f736f3
commit b2373f255c
2 changed files with 10 additions and 0 deletions
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9
fs/btrfs/volumes.c
View File

@ -2154,6 +2154,7 @@ int btrfs_init_new_device(struct btrfs_root *root, char *device_path)
mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
if (seeding_dev) {
char fsid_buf[BTRFS_UUID_UNPARSED_SIZE];
ret = init_first_rw_device(trans, root, device);
if (ret) {
btrfs_abort_transaction(trans, root, ret);
@ -2164,6 +2165,14 @@ int btrfs_init_new_device(struct btrfs_root *root, char *device_path)
btrfs_abort_transaction(trans, root, ret);
goto error_trans;
}
/* Sprouting would change fsid of the mounted root,
* so rename the fsid on the sysfs
*/
snprintf(fsid_buf, BTRFS_UUID_UNPARSED_SIZE, "%pU",
root->fs_info->fsid);
if (kobject_rename(&root->fs_info->super_kobj, fsid_buf))
goto error_trans;
} else {
ret = btrfs_add_device(trans, root, device);
if (ret) {

1
include/uapi/linux/btrfs.h
View File

@ -38,6 +38,7 @@ struct btrfs_ioctl_vol_args {
#define BTRFS_SUBVOL_QGROUP_INHERIT (1ULL << 2)
#define BTRFS_FSID_SIZE 16
#define BTRFS_UUID_SIZE 16
#define BTRFS_UUID_UNPARSED_SIZE 37
#define BTRFS_QGROUP_INHERIT_SET_LIMITS (1ULL << 0)