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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
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>
-rw-r--r--drivers/md/dm-crypt.c3
-rw-r--r--drivers/md/dm-mpath.c3
-rw-r--r--drivers/md/dm-snap.c6
-rw-r--r--drivers/md/dm.c9
4 files changed, 9 insertions, 12 deletions
diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index ece7c7c4cdb..ba952a03259 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -941,9 +941,6 @@ static int crypt_map(struct dm_target *ti, struct bio *bio,
struct crypt_config *cc = ti->private;
struct dm_crypt_io *io;
- if (bio_barrier(bio))
- return -EOPNOTSUPP;
-
io = mempool_alloc(cc->io_pool, GFP_NOIO);
io->target = ti;
io->base_bio = bio;
diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
index fc6c1021178..d6ca9d0a6fd 100644
--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c
@@ -798,9 +798,6 @@ static int multipath_map(struct dm_target *ti, struct bio *bio,
struct dm_mpath_io *mpio;
struct multipath *m = (struct multipath *) ti->private;
- if (bio_barrier(bio))
- return -EOPNOTSUPP;
-
mpio = mempool_alloc(m->mpio_pool, GFP_NOIO);
dm_bio_record(&mpio->details, bio);
diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c
index 854891d07b5..83ddbfe6b8a 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;
}
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index b5e56af8f85..f4f7d35561a 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -800,6 +800,15 @@ static int dm_request(request_queue_t *q, struct bio *bio)
int rw = bio_data_dir(bio);
struct mapped_device *md = q->queuedata;
+ /*
+ * There is no use in forwarding any barrier request since we can't
+ * guarantee it is (or can be) handled by the targets correctly.
+ */
+ if (unlikely(bio_barrier(bio))) {
+ bio_endio(bio, bio->bi_size, -EOPNOTSUPP);
+ return 0;
+ }
+
down_read(&md->io_lock);
disk_stat_inc(dm_disk(md), ios[rw]);