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[PATCH] device-mapper snapshot: barriers not supported

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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>
This commit is contained in:
Alasdair G Kergon 2006-02-01 03:04:55 -08:00 committed by Linus Torvalds
parent 3eaf840e0b
commit 4aac0a63fe
1 changed files with 6 additions and 0 deletions
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6
drivers/md/dm-snap.c
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@ -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;
}