Btrfs: Fix ordering of key field checks in btrfs_previous_item

Check objectid of item before checking the item type, otherwise we may return
zero for a key that is actually too low.

Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 9157209..978449a 100644 (file)
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -4296,10 +4296,10 @@ int btrfs_previous_item(struct btrfs_root *root,
                        path->slots[0]--;
 
                btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
-               if (found_key.type == type)
-                       return 0;
                if (found_key.objectid < min_objectid)
                        break;
+               if (found_key.type == type)
+                       return 0;
                if (found_key.objectid == min_objectid &&
                    found_key.type < type)
                        break;