diff options
| author | Alasdair G Kergon <agk@redhat.com> | 2006-02-01 03:04:55 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-02-01 08:53:11 -0800 |
| commit | 4aac0a63fe8d418a2b74e43708f59380ba379a3b (patch) | |
| tree | b71c432edf274776443a27d5dfdbd7800d014e08 /drivers/md | |
| parent | 3eaf840e0b0046f56602c524c7ba58a82f5526c5 (diff) | |
| download | lwn-4aac0a63fe8d418a2b74e43708f59380ba379a3b.tar.gz lwn-4aac0a63fe8d418a2b74e43708f59380ba379a3b.zip | |
[PATCH] device-mapper snapshot: barriers not supported
The snapshot and origin targets are incapable of handling barriers and need to
indicate this.
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>
Diffstat (limited to 'drivers/md')
| -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; } |