lkml.org 
[lkml]   [2006]   [Jan]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[PATCH 6/9] 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>

Index: linux-2.6.16-rc1/drivers/md/dm-snap.c
===================================================================
--- linux-2.6.16-rc1.orig/drivers/md/dm-snap.c
+++ linux-2.6.16-rc1/drivers/md/dm-snap.c
@@ -792,6 +792,9 @@ static int snapshot_map(struct dm_target
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 *
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;
}
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
\
 
 \ /
  Last update: 2006-01-20 22:20    [W:0.352 / U:1.180 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site