block: convert qemu_aio_flush() calls to bdrv_drain_all()
Many places in QEMU call qemu_aio_flush() to complete all pending
asynchronous I/O. Most of these places actually want to drain all block
requests but there is no block layer API to do so.
This patch introduces the bdrv_drain_all() API to wait for requests
across all BlockDriverStates to complete. As a bonus we perform checks
after qemu_aio_wait() to ensure that requests really have finished.
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
diff --git a/qemu-io.c b/qemu-io.c
index de26422..b35adbb 100644
--- a/qemu-io.c
+++ b/qemu-io.c
@@ -1853,9 +1853,9 @@
command_loop();
/*
- * Make sure all outstanding requests get flushed the program exits.
+ * Make sure all outstanding requests complete before the program exits.
*/
- qemu_aio_flush();
+ bdrv_drain_all();
if (bs) {
bdrv_delete(bs);