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authorStefan Bader <shbader@de.ibm.com>2007-07-12 17:28:33 +0100
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-12 15:01:08 -0700
commit07a83c47cfc00ba5f0f090ccddd3a0703be0eec9 (patch)
treea17d8028f76ba242a04f3c0678644f93cc7eee7d /drivers/md/dm-snap.c
parent943317efdbc295e8a28df3f5cbd549d066ee8b4a (diff)
dm: disable barriers
This patch causes device-mapper to reject any barrier requests. This is done since most of the targets won't handle this correctly anyway. So until the situation improves it is better to reject these requests at the first place. Since barrier requests won't get to the targets, the checks there can be removed. Cc: stable@kernel.org Signed-off-by: Stefan Bader <shbader@de.ibm.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/md/dm-snap.c')
-rw-r--r--drivers/md/dm-snap.c6
1 files changed, 0 insertions, 6 deletions
diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c
index 854891d07b59..83ddbfe6b8a4 100644
--- a/drivers/md/dm-snap.c
+++ b/drivers/md/dm-snap.c
@@ -889,9 +889,6 @@ static int snapshot_map(struct dm_target *ti, struct bio *bio,
if (!s->valid)
return -EIO;
- if (unlikely(bio_barrier(bio)))
- return -EOPNOTSUPP;
-
/* FIXME: should only take write lock if we need
* to copy an exception */
down_write(&s->lock);
@@ -1162,9 +1159,6 @@ static int origin_map(struct dm_target *ti, struct bio *bio,
struct dm_dev *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) : DM_MAPIO_REMAPPED;
}