Btrfs: check to see if we have an inline item properly

If our item isn't big enough to have an actual inline item when we have skinny
metadata enabled just return 1 in find_inline_backref so we can move on to the
next item.  This probably wasn't causing a problem since we check the values of
ptr and end properly, but just in case this will keep us from doing extra work.
Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>

diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
index 5a23d875ab40730cab866d35a9a6a96245b80976..8168fb351adbeffb89db31adf785ebe77648e0f7 100644 (file)
--- a/fs/btrfs/relocation.c
+++ b/fs/btrfs/relocation.c
@@ -641,6 +641,11 @@ int find_inline_backref(struct extent_buffer *leaf, int slot,
                WARN_ON(item_size < sizeof(*ei) + sizeof(*bi));
                return 1;
        }
+       if (key.type == BTRFS_METADATA_ITEM_KEY &&
+           item_size <= sizeof(*ei)) {
+               WARN_ON(item_size < sizeof(*ei));
+               return 1;
+       }
 
        if (key.type == BTRFS_EXTENT_ITEM_KEY) {
                bi = (struct btrfs_tree_block_info *)(ei + 1);