Add barrier support to dm-raid.

MD has support for barriers. DM core has support for barriers. Set the
variable necessary to indicate to DM core that it is ok to pass down
barrier requests - which dm-raid will simply pass along to MD.

Signed-off-by: Jonathan Brassow <jbrassow@redhat.com>

Index: linux-upstream/drivers/md/dm-raid.c
================================================== =================
--- linux-upstream.orig/drivers/md/dm-raid.c
+++ linux-upstream/drivers/md/dm-raid.c
@@ -971,6 +971,7 @@ static int raid_ctr(struct dm_target *ti

INIT_WORK(&rs->md.event_work, do_table_event);
ti->private = rs;
+ ti->num_flush_requests = 1;

mutex_lock(&rs->md.reconfig_mutex);
ret = md_run(&rs->md);


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On Tue, Feb 28 2012 at 8:57am -0500,
Jonathan Brassow <jbrassow@redhat.com> wrote:

> Add barrier support to dm-raid.
>
> MD has support for barriers. DM core has support for barriers. Set the
> variable necessary to indicate to DM core that it is ok to pass down
> barrier requests - which dm-raid will simply pass along to MD.
>
> Signed-off-by: Jonathan Brassow <jbrassow@redhat.com>

Acked-by: Mike Snitzer <snitzer@redhat.com>

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