[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" <[email protected]> From: Kevin Corry <[email protected]> Signed-Off-By: Alasdair G Kergon <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
kishon · Jul 8, 2005 · d88854f · d88854f
1 parent 374a6cf
commit d88854f
Showing 1 changed file with 1 addition and 0 deletions.
diff --git 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) {