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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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2
xen-mapcache.c
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@ -351,7 +351,7 @@ void xen_invalidate_map_cache(void)
MapCacheRev *reventry;
/* Flush pending AIO before destroying the mapcache */
qemu_aio_flush();
bdrv_drain_all();
QTAILQ_FOREACH(reventry, &mapcache->locked_entries, next) {
DPRINTF("There should be no locked mappings at this time, "