Btrfs: don't look at the extent buffer level 3 times in a row

We have a bit of debugging in btrfs_search_slot to make sure the level of the
cow block is the same as the original block we were cow'ing.  I don't think I've
ever seen this tripped, so kill it.  This saves us 2 kmap's per level in our
search.  Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>

diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 009bcf7..f7a0a64 100644 (file)
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -1672,9 +1672,6 @@ again:
                }
 cow_done:
                BUG_ON(!cow && ins_len);
-               if (level != btrfs_header_level(b))
-                       WARN_ON(1);
-               level = btrfs_header_level(b);
 
                p->nodes[level] = b;
                if (!p->skip_locking)