From: Mikulas Patocka <mpatocka@redhat.com>
Date: Tue, 2 Aug 2011 11:32:00 +0000 (+0100)
Subject: dm snapshot: flush disk cache when merging
X-Git-Tag: v3.1-rc1~85^2~33
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=762a80d9fc9f690a3a35983f3b4619a220650808;p=pandora-kernel.git

dm snapshot: flush disk cache when merging

This patch makes dm-snapshot flush disk cache when writing metadata for
merging snapshot.

Without cache flushing the disk may reorder metadata write and other
data writes and there is a possibility of data corruption in case of
power fault.

Cc: stable@kernel.org
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
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