[Xen-devel] [PATCH] ioemu: block-vbd: Fix vbd_aio_flush()

[Yosuke Iwamatsu <y-iwamatsu@xxxxxxxxxxxxx>]

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

Signed-off-by: Yosuke Iwamatsu <y-iwamatsu@xxxxxxxxxxxxx>

diff --git a/block-vbd.c b/block-vbd.c
index 4341259..129a1f5 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;
     }


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