xen-blkfront: disable barrier/flush write support
The driver doesn't handle empty flushes. Disable barrier/flush
write support until this is fixed up.
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index f2ffc46..739b4c1 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -1067,8 +1067,15 @@
* If there are barriers, then we use flush.
*/
info->feature_flush = 0;
+
+ /*
+ * The driver doesn't properly handled empty flushes, so
+ * lets disable barrier support for now.
+ */
+#if 0
if (!err && barrier)
info->feature_flush = REQ_FLUSH;
+#endif
err = xlvbd_alloc_gendisk(sectors, info, binfo, sector_size);
if (err) {