btrfs: drop uuid_mutex in btrfs_dev_replace_finishing

btrfs_dev_replace_finishing updates devices (soruce and target) which
are within the btrfs_fs_devices::devices or withint the cloned seed
devices (btrfs_fs_devices::seed::devices), so we don't need the global
uuid_mutex.

The device replace context is also locked by its own locks.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

1 files changed, 0 insertions, 3 deletions

diff --git a/fs/btrfs/dev-replace.c b/fs/btrfs/dev-replace.c
index 89946285203d..e2ba0419297a 100644
--- a/fs/btrfs/dev-replace.c
+++ b/fs/btrfs/dev-replace.c
@@ -609,7 +609,6 @@ static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info,
         ret = btrfs_commit_transaction(trans);
         WARN_ON(ret);
 
-        mutex_lock(&uuid_mutex);
         /* keep away write_all_supers() during the finishing procedure */
         mutex_lock(&fs_info->fs_devices->device_list_mutex);
         mutex_lock(&fs_info->chunk_mutex);
@@ -636,7 +635,6 @@ static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info,
                 btrfs_dev_replace_write_unlock(dev_replace);
                 mutex_unlock(&fs_info->chunk_mutex);
                 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
-                mutex_unlock(&uuid_mutex);
                 btrfs_rm_dev_replace_blocked(fs_info);
                 if (tgt_device)
                         btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device);
@@ -687,7 +685,6 @@ static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info,
          */
         mutex_unlock(&fs_info->chunk_mutex);
         mutex_unlock(&fs_info->fs_devices->device_list_mutex);
-        mutex_unlock(&uuid_mutex);
 
         /* replace the sysfs entry */
         btrfs_sysfs_rm_device_link(fs_info->fs_devices, src_device);