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authorAlasdair G Kergon <agk@redhat.com>2006-02-01 03:04:55 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-02-01 08:53:11 -0800
commit4aac0a63fe8d418a2b74e43708f59380ba379a3b (patch)
treeb71c432edf274776443a27d5dfdbd7800d014e08 /drivers/md
parent3eaf840e0b0046f56602c524c7ba58a82f5526c5 (diff)
[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.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c
index ad9b61f16c5..f3759dd7828 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;
}