Commit d88854f0 authored by Alasdair G Kergon's avatar Alasdair G Kergon Committed by Linus Torvalds

[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: default avatar"Zhao Qian" <>
From: Kevin Corry <>
Signed-Off-By: default avatarAlasdair G Kergon <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent 374a6cf2
......@@ -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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