From d88854f08961d26f3a63cfae7972188d26a128e4 Mon Sep 17 00:00:00 2001
From: Alasdair G Kergon <agk@redhat.com>
Date: Thu, 7 Jul 2005 17:59:34 -0700
Subject: [PATCH] [PATCH] device-mapper: dm-raid1: Limit bios to size of mirror
region
Set the target's split_io field when building a dm-mirror device so
incoming bios won't span the mirror's internal regions. Without this,
regions can be accessed while not holding correct locks and data corruption
is possible.
Reported-By: "Zhao Qian" <zhaoqian@aaastor.com>
From: Kevin Corry <kevcorry@us.ibm.com>
Signed-Off-By: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
drivers/md/dm-raid1.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/md/dm-raid1.c b/drivers/md/dm-raid1.c
index 6e3cf7e134515..12031c9d3f1e1 100644
--- a/drivers/md/dm-raid1.c
+++ b/drivers/md/dm-raid1.c
@@ -1060,6 +1060,7 @@ static int mirror_ctr(struct dm_target *ti, unsigned int argc, char **argv)
}
ti->private = ms;
+ ti->split_io = ms->rh.region_size;
r = kcopyd_client_create(DM_IO_PAGES, &ms->kcopyd_client);
if (r) {
--
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