From: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Date: Sat, 28 Dec 2013 11:52:39 +0000 (+0800)
Subject: Btrfs: fix an oops when we fail to relocate tree blocks
X-Git-Tag: v3.14-rc1~29^2~63
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1708cc5723cb775703b42a0ce8e521019c42dd67;p=pandora-kernel.git

Btrfs: fix an oops when we fail to relocate tree blocks

During balance test, we hit an oops:
[ 2013.841551] kernel BUG at fs/btrfs/relocation.c:1174!

The problem is that if we fail to relocate tree blocks, we should
update backref cache, otherwise, some pending nodes are not updated
while snapshot check @cache->last_trans is within one transaction
and won't update it and then oops happen.

Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>
---

Reading git-diff-tree failed