From: Mike Snitzer <snitzer@redhat.com>
Date: Fri, 10 May 2013 13:37:16 +0000 (+0100)
Subject: dm mpath: enable WRITE SAME support
X-Git-Tag: submit/tizen_common/20140905.094502~2912^2~15
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=042bcef889f4319d366c67fb694f1f2498fcb68e;p=sdk%2Femulator%2Femulator-kernel.git

dm mpath: enable WRITE SAME support

Enable WRITE SAME support in dm multipath.  As far as multipath is
concerned it is just another write request.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Tested-by: Bharata B Rao <bharata.rao@gmail.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
---

diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
index 51bb81676be3..bdf26f5bd326 100644
--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c
@@ -907,6 +907,7 @@ static int multipath_ctr(struct dm_target *ti, unsigned int argc,
 
 	ti->num_flush_bios = 1;
 	ti->num_discard_bios = 1;
+	ti->num_write_same_bios = 1;
 
 	return 0;