Btrfs: return error code to caller when btrfs_previous_item fails

The error code is returned instead of calling BUG_ON when
btrfs_previous_item returns the error.

Signed-off-by: Tsutomu Itoh <t-itoh@jp.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index c7367ae..e40cdd5 100644 (file)
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -949,14 +949,14 @@ static int btrfs_free_dev_extent(struct btrfs_trans_handle *trans,
        if (ret > 0) {
                ret = btrfs_previous_item(root, path, key.objectid,
                                          BTRFS_DEV_EXTENT_KEY);
-               BUG_ON(ret);
+               if (ret)
+                       goto out;
                leaf = path->nodes[0];
                btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
                extent = btrfs_item_ptr(leaf, path->slots[0],
                                        struct btrfs_dev_extent);
                BUG_ON(found_key.offset > start || found_key.offset +
                       btrfs_dev_extent_length(leaf, extent) < start);
-               ret = 0;
        } else if (ret == 0) {
                leaf = path->nodes[0];
                extent = btrfs_item_ptr(leaf, path->slots[0],
@@ -969,6 +969,7 @@ static int btrfs_free_dev_extent(struct btrfs_trans_handle *trans,
        ret = btrfs_del_item(trans, root, path);
        BUG_ON(ret);
 
+out:
        btrfs_free_path(path);
        return ret;
 }