From: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Date: Wed, 4 Dec 2013 13:15:19 +0000 (+0800)
Subject: Btrfs: fix wrong super generation mismatch when scrubbing supers
X-Git-Tag: v3.14-rc1~29^2~98
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3cb0929ad24c95c5fd8f08eb41a702a65954b4c6;p=pandora-kernel.git

Btrfs: fix wrong super generation mismatch when scrubbing supers

We came a race condition when scrubbing superblocks, the story is:

In commiting transaction, we will update @last_trans_commited after
writting superblocks, if scrubber start after writting superblocks
and before updating @last_trans_commited, generation mismatch happens!

We fix this by checking @scrub_pause_req, and we won't start a srubber
until commiting transaction is finished.(after btrfs_scrub_continue()
finished.)

Reported-by: Sebastian Ochmann <ochmann@informatik.uni-bonn.de>
Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Reviewed-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>
---

Reading git-diff-tree failed