[PATCH 6/9] device-mapper snapshot: barriers not supported
- From: Alasdair G Kergon <agk@xxxxxxxxxx>
- Date: Fri, 20 Jan 2006 21:17:59 +0000
The snapshot and origin targets are incapable of handling barriers and
need to indicate this.
Signed-Off-By: Alasdair G Kergon <agk@xxxxxxxxxx>
Index: linux-2.6.16-rc1/drivers/md/dm-snap.c
===================================================================
--- linux-2.6.16-rc1.orig/drivers/md/dm-snap.c
+++ linux-2.6.16-rc1/drivers/md/dm-snap.c
@@ -792,6 +792,9 @@ static int snapshot_map(struct dm_target
if (!s->valid)
return -EIO;
+ if (unlikely(bio_barrier(bio)))
+ return -EOPNOTSUPP;
+
/*
* Write to snapshot - higher level takes care of RW/RO
* flags so we should only get this if we are
@@ -1058,6 +1061,9 @@ static int origin_map(struct dm_target *
struct dm_dev *dev = (struct dm_dev *) ti->private;
bio->bi_bdev = dev->bdev;
+ if (unlikely(bio_barrier(bio)))
+ return -EOPNOTSUPP;
+
/* Only tell snapshots if this is a write */
return (bio_rw(bio) == WRITE) ? do_origin(dev, bio) : 1;
}
-
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