[PATCH] device-mapper: dm-raid1: Limit bios to size of mirror region

[Alasdair G Kergon <agk@redhat.com>]

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>

--- diff/drivers/md/dm-raid1.c	2005-06-17 20:48:29.000000000 +0100
+++ source/drivers/md/dm-raid1.c	2005-06-29 21:12:13.000000000 +0100
@@ -1060,6 +1060,7 @@
 	}
 
 	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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