Commit d88854f0 authored Jul 07, 2005 by Alasdair G Kergon Committed by Linus Torvalds Jul 07, 2005

[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>

parent 374a6cf2

drivers/md/dm-raid1.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -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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