From: Ian Jackson <ian.jackson@eu.citrix.com>
Date: Thu, 19 Feb 2009 17:40:03 +0000 (+0000)
Subject: block-vbd: Fix vbd_aio_flush() no-op case
X-Git-Tag: t.master-before-merge~14
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=efbb947dba15cc0bf96448c24e3f47e3607002d8;p=qemu-xen-4.0-testing.git

block-vbd: Fix vbd_aio_flush() no-op case

Call the completion function if flush features are not supported in blkfront.

Signed-off-by: Yosuke Iwamatsu <y-iwamatsu@ab.jp.nec.com>
---

diff --git a/block-vbd.c b/block-vbd.c
index 4341259b..129a1f55 100644
--- a/block-vbd.c
+++ b/block-vbd.c
@@ -261,7 +261,8 @@ static BlockDriverAIOCB *vbd_aio_flush(BlockDriverState *bs,
     BDRVVbdState *s = bs->opaque;
     VbdAIOCB *acb = NULL;
 
-    if (s->info.mode == O_RDONLY) {
+    if (s->info.mode == O_RDONLY ||
+        s->info.barrier != 1 || s->info.flush != 1) {
         cb(opaque, 0);
         return NULL;
     }