commit 922453bca6a927bb527068ae8679d587cfa45dbc
author Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Wed Nov 30 12:23:43 2011 +0000
committer Kevin Wolf <kwolf@redhat.com> Mon Dec 05 14:56:06 2011 +0100
tree beb8fc3e9e180558f423e5b7ce97affed1ee8ca6
parent 5f8b6491f20732e0a31e64bbf75b62def579e044

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>

blockdev.c

diff --git a/blockdev.c b/blockdev.c
index af4e239..dbf0251 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -653,7 +653,7 @@
         goto out;
     }
 
-    qemu_aio_flush();
+    bdrv_drain_all();
     bdrv_flush(bs);
 
     bdrv_close(bs);
@@ -840,7 +840,7 @@
     }
 
     /* quiesce block driver; prevent further io */
-    qemu_aio_flush();
+    bdrv_drain_all();
     bdrv_flush(bs);
     bdrv_close(bs);