[PATCH] device-mapper multipath: Barriers not supported

[Alasdair G Kergon]

dm multipath will report barriers as not supported with this patch.
                                                                                
Signed-off-by: Lars Marowsky-Bree <lmb@xxxxxxx>
Signed-Off-By: Alasdair G Kergon <agk@xxxxxxxxxx>

--- diff/drivers/md/dm-mpath.c	2005-06-17 20:48:29.000000000 +0100
+++ source/drivers/md/dm-mpath.c	2005-07-08 19:01:41.000000000 +0100
@@ -765,6 +765,9 @@
 	struct 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);
 
@@ -988,6 +991,9 @@
 	if ((error == -EWOULDBLOCK) && bio_rw_ahead(bio))
 		return error;
 
+	if (error == -EOPNOTSUPP)
+		return error;
+
 	spin_lock(&m->lock);
 	if (!m->nr_valid_paths) {
 		if (!m->queue_if_no_path || m->suspended) {
--- diff/drivers/md/dm-snap.c	2005-06-17 20:48:29.000000000 +0100
+++ source/drivers/md/dm-snap.c	2005-07-08 19:01:41.000000000 +0100
@@ -777,7 +777,7 @@
 
 	/* Full snapshots are not usable */
 	if (!s->valid)
-		return -1;
+		return -EIO;
 
 	/*
 	 * Write to snapshot - higher level takes care of RW/RO
--- diff/drivers/md/dm.c	2005-06-17 20:48:29.000000000 +0100
+++ source/drivers/md/dm.c	2005-07-08 19:01:41.000000000 +0100
@@ -384,7 +384,7 @@
 		/* error the io and bail out */
 		struct dm_io *io = tio->io;
 		free_tio(tio->io->md, tio);
-		dec_pending(io, -EIO);
+		dec_pending(io, r);
 		bio_put(clone);
 	}
 }
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/