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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
qemu-io.c
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@ -1853,9 +1853,9 @@ int main(int argc, char **argv)
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);