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

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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>
This commit is contained in:
Alasdair G Kergon 2005-07-07 17:59:34 -07:00 committed by Linus Torvalds
parent 374a6cf281
commit d88854f089
1 changed files with 1 additions and 0 deletions
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drivers/md/dm-raid1.c
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@ -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) {