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>

diff --git a/fs/btrfs/dev-replace.c b/fs/btrfs/dev-replace.c
index 8994628..e2ba041 100644 (file)
--- 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);