svn commit: r246307 - projects/virtio/sys/dev/virtio/block

[Bryan Venteicher]

Author: bryanv
Date: Sun Feb  3 23:35:53 2013
New Revision: 246307
URL: http://svnweb.freebsd.org/changeset/base/246307

Log:
  virtio_blk: Correct stripe offset calculation
  
  Pointed out by:	max
  Approved by:	grehan (implicit)

Modified:
  projects/virtio/sys/dev/virtio/block/virtio_blk.c

Modified: projects/virtio/sys/dev/virtio/block/virtio_blk.c
==============================================================================
--- projects/virtio/sys/dev/virtio/block/virtio_blk.c	Sun Feb  3 23:35:05 2013	(r246306)
+++ projects/virtio/sys/dev/virtio/block/virtio_blk.c	Sun Feb  3 23:35:53 2013	(r246307)
@@ -725,8 +725,9 @@ vtblk_alloc_disk(struct vtblk_softc *sc,
 	if (virtio_with_feature(dev, VIRTIO_BLK_F_TOPOLOGY)) {
 		dp->d_stripesize = dp->d_sectorsize *
 		    (1 << blkcfg->topology.physical_block_exp);
-		dp->d_stripeoffset = dp->d_sectorsize *
-		    blkcfg->topology.alignment_offset;
+		dp->d_stripeoffset = (dp->d_stripesize -
+		    blkcfg->topology.alignment_offset * dp->d_sectorsize) %
+		    dp->d_stripesize;
 	}
 
 	if (vtblk_write_cache_enabled(sc, blkcfg) != 0)