From: Josef Bacik <josef@redhat.com>
Date: Wed, 11 May 2011 16:25:37 +0000 (-0400)
Subject: Btrfs: don't look at the extent buffer level 3 times in a row
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=7e2355ba1a11649f0b212a29fdb9f47476f1248e;p=linux-beck.git

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 009bcf7f1e4b..f7a0a64b868f 100644
--- 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)