diff options
| -rw-r--r-- | drivers/md/dm-snap.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c index ad9b61f16c5e..f3759dd7828e 100644 --- a/drivers/md/dm-snap.c +++ b/drivers/md/dm-snap.c @@ -792,6 +792,9 @@ static int snapshot_map(struct dm_target *ti, struct bio *bio, 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 *ti, struct bio *bio, 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; } |