Btrfs: fix inode leak on failure to setup whiteout inode in rename

If we failed to fully setup the whiteout inode during a rename operation
with the whiteout flag, we ended up leaking the inode, not decrementing
its link count nor removing all its items from the fs/subvol tree.

Signed-off-by: Filipe Manana <fdmanana@suse.com>

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 452cfef..98c119b 100644 (file)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -9612,21 +9612,21 @@ static int btrfs_whiteout_for_rename(struct btrfs_trans_handle *trans,
        ret = btrfs_init_inode_security(trans, inode, dir,
                                &dentry->d_name);
        if (ret)
-               return ret;
+               goto out;
 
        ret = btrfs_add_nondir(trans, dir, dentry,
                                inode, 0, index);
        if (ret)
-               return ret;
+               goto out;
 
        ret = btrfs_update_inode(trans, root, inode);
-       if (ret)
-               return ret;
-
+out:
        unlock_new_inode(inode);
+       if (ret)
+               inode_dec_link_count(inode);
        iput(inode);
 
-       return 0;
+       return ret;
 }
 
 static int btrfs_rename(struct inode *old_dir, struct dentry *old_dentry,