1 files changed, 7 insertions, 4 deletions

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 4cbb00af92ff..62176ad89846 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -157,6 +157,7 @@ static struct btrfs_lockdep_keyset {
         { .id = BTRFS_TREE_LOG_OBJECTID,        .name_stem = "log"      },
         { .id = BTRFS_TREE_RELOC_OBJECTID,      .name_stem = "treloc"   },
         { .id = BTRFS_DATA_RELOC_TREE_OBJECTID, .name_stem = "dreloc"   },
+        { .id = BTRFS_UUID_TREE_OBJECTID,       .name_stem = "uuid"     },
         { .id = 0,                              .name_stem = "tree"     },
 };
 
@@ -1560,8 +1561,9 @@ int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
         return ret;
 }
 
-struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
-                                              struct btrfs_key *location)
+struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
+                                     struct btrfs_key *location,
+                                     bool check_ref)
 {
         struct btrfs_root *root;
         int ret;
@@ -1585,7 +1587,7 @@ struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
 again:
         root = btrfs_lookup_fs_root(fs_info, location->objectid);
         if (root) {
-                if (btrfs_root_refs(&root->root_item) == 0)
+                if (check_ref && btrfs_root_refs(&root->root_item) == 0)
                         return ERR_PTR(-ENOENT);
                 return root;
         }
@@ -1594,7 +1596,7 @@ again:
         if (IS_ERR(root))
                 return root;
 
-        if (btrfs_root_refs(&root->root_item) == 0) {
+        if (check_ref && btrfs_root_refs(&root->root_item) == 0) {
                 ret = -ENOENT;
                 goto fail;
         }
@@ -3415,6 +3417,7 @@ static int write_all_supers(struct btrfs_root *root, int max_mirrors)
         if (total_errors > max_errors) {
                 printk(KERN_ERR "btrfs: %d errors while writing supers\n",
                        total_errors);
+                mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
 
                 /* FUA is masked off if unsupported and can't be the reason */
                 btrfs_error(root->fs_info, -EIO,