Btrfs: Metadata reservation for orphan inodes

[net-next-2.6.git] / fs / btrfs / ioctl.c

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index a0686658a3f680831a3dc651946302cd938f12f8..4cdb98cf26de174e644e7d74e2a97e2fe037f08b 100644 (file)
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -1297,10 +1297,12 @@ static noinline int btrfs_ioctl_snap_destroy(struct file *file,
        dest->root_item.drop_level = 0;
        btrfs_set_root_refs(&dest->root_item, 0);
 
-       ret = btrfs_insert_orphan_item(trans,
-                               root->fs_info->tree_root,
-                               dest->root_key.objectid);
-       BUG_ON(ret);
+       if (!xchg(&dest->orphan_item_inserted, 1)) {
+               ret = btrfs_insert_orphan_item(trans,
+                                       root->fs_info->tree_root,
+                                       dest->root_key.objectid);
+               BUG_ON(ret);
+       }
 
        ret = btrfs_commit_transaction(trans, root);
        BUG_ON(ret);