From: Yan, Zheng <zheng.z.yan@intel.com>
Date: Fri, 31 May 2013 08:48:29 +0000 (+0800)
Subject: ceph: fix race between page writeback and truncate
X-Git-Tag: v3.11-rc1~69^2~16
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fc2744aa12da7182509b1059aa3ab53754d0c83a;p=pandora-kernel.git

ceph: fix race between page writeback and truncate

The client can receive truncate request from MDS at any time.
So the page writeback code need to get i_size, truncate_seq and
truncate_size atomically

Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
Reviewed-by: Sage Weil <sage@inktank.com>
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