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[Qemu-block] [PATCH 1/4] block: Use drained section in bdrv_set_aio_cont

From: Fam Zheng
Subject: [Qemu-block] [PATCH 1/4] block: Use drained section in bdrv_set_aio_context
Date: Wed, 16 Mar 2016 18:10:15 +0800

An empty begin/end pair is almost the same as a bare bdrv_drain except
the aio_poll inside is wrapped by

This is safer, and is the only way to achieve quiescence in this
aio_poll(), because bdrv_drained_begin/end pair cannot span across
context detach/attach options, so it's not possible to do by the caller.

Signed-off-by: Fam Zheng <address@hidden>
 block.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/block.c b/block.c
index 59a18a3..31f4a9f 100644
--- a/block.c
+++ b/block.c
@@ -3747,7 +3747,9 @@ void bdrv_attach_aio_context(BlockDriverState *bs,
 void bdrv_set_aio_context(BlockDriverState *bs, AioContext *new_context)
-    bdrv_drain(bs); /* ensure there are no in-flight requests */
+    /* ensure there are no in-flight requests */
+    bdrv_drained_begin(bs);
+    bdrv_drained_end(bs);

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