From: Liu Bo <liubo2009@cn.fujitsu.com>
Date: Thu, 29 Mar 2012 13:57:44 +0000 (-0400)
Subject: Btrfs: fix the mismatch of page->mapping
X-Git-Tag: v3.4-rc1~22^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1f12bd063285b059cb63315d1424dae1ddd87a64;p=pandora-kernel.git

Btrfs: fix the mismatch of page->mapping

commit 600a45e1d5e376f679ff9ecc4ce9452710a6d27c
(Btrfs: fix deadlock on page lock when doing auto-defragment)
fixes the deadlock on page, but it also introduces another bug.

A page may have been truncated after unlock & lock.
So we need to find it again to get the right one.

And since we've held i_mutex lock, inode size remains unchanged and
we can drop isize overflow checks.

Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
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