[Qemu-devel] [PATCH 3/3] block: guard bdrv_drain in bdrv_close with aio_context_acquire

["Denis V. Lunev" <den@openvz.org>]

bdrv_close is called in tooooo much places to properly track at the moment.

Signed-off-by: Denis V. Lunev <den@openvz.org>
CC: Stefan Hajnoczi <stefanha@redhat.com>
---
 block.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/block.c b/block.c
index e9f40dc..98b0b66 100644
--- a/block.c
+++ b/block.c
@@ -1895,6 +1895,7 @@ void bdrv_reopen_abort(BDRVReopenState *reopen_state)
 void bdrv_close(BlockDriverState *bs)
 {
     BdrvAioNotifier *ban, *ban_next;
+    AioContext *ctx;
 
     if (bs->job) {
         block_job_cancel_sync(bs->job);
@@ -1905,9 +1906,13 @@ void bdrv_close(BlockDriverState *bs)
         bdrv_io_limits_disable(bs);
     }
 
+    ctx = bdrv_get_aio_context(bs);
+    aio_context_acquire(ctx);
     bdrv_drain(bs); /* complete I/O */
     bdrv_flush(bs);
     bdrv_drain(bs); /* in case flush left pending I/O */
+    aio_context_release(ctx);
+
     notifier_list_notify(&bs->close_notifiers, bs);
 
     if (bs->blk) {
-- 
2.5.0