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block: convert qemu_aio_flush() calls to bdrv_drain_all()

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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>
This commit is contained in:
Stefan Hajnoczi
2011-11-30 12:23:43 +00:00
committed by Kevin Wolf
parent 5f8b6491f2
commit 922453bca6
12 changed files with 34 additions and 13 deletions
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4
blockdev.c
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@ -653,7 +653,7 @@ int do_snapshot_blkdev(Monitor *mon, const QDict *qdict, QObject **ret_data)
goto out;
}
qemu_aio_flush();
bdrv_drain_all();
bdrv_flush(bs);
bdrv_close(bs);
@ -840,7 +840,7 @@ int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
}
/* quiesce block driver; prevent further io */
qemu_aio_flush();
bdrv_drain_all();
bdrv_flush(bs);
bdrv_close(bs);