From: Mike Snitzer <snitzer@redhat.com>
Date: Thu, 10 Dec 2009 23:52:31 +0000 (+0000)
Subject: dm snapshot: support barriers in snapshot merge target
X-Git-Tag: v2.6.33-rc1~75^2~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=10b8106a70433e14153469ebbdd189776500e238;p=pandora-kernel.git

dm snapshot: support barriers in snapshot merge target

Sets num_flush_requests=2 to support flushing both the origin and cow
devices used by the snapshot-merge target.

Also, snapshot_ctr() now gets the origin device using FMODE_WRITE if the
target is snapshot-merge (which writes to the origin device).

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
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