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iothread: detach all block devices before stopping them

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Soon bdrv_drain will not call aio_poll itself on iothreads.  If block
devices are left hanging off the iothread's AioContext, there will be no
one to do I/O for those poor devices.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Message-Id: <1477565348-5458-13-git-send-email-pbonzini@redhat.com>
Signed-off-by: Fam Zheng <famz@redhat.com>
This commit is contained in:
Paolo Bonzini 2016-10-27 12:49:00 +02:00 committed by Fam Zheng
parent e437016511
commit d16341fa69
1 changed files with 13 additions and 0 deletions
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13
iothread.c
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@ -16,6 +16,7 @@
#include "qom/object_interfaces.h"
#include "qemu/module.h"
#include "block/aio.h"
#include "block/block.h"
#include "sysemu/iothread.h"
#include "qmp-commands.h"
#include "qemu/error-report.h"
@ -199,6 +200,18 @@ IOThreadInfoList *qmp_query_iothreads(Error **errp)
void iothread_stop_all(void)
{
Object *container = object_get_objects_root();
BlockDriverState *bs;
BdrvNextIterator it;
for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) {
AioContext *ctx = bdrv_get_aio_context(bs);
if (ctx == qemu_get_aio_context()) {
continue;
}
aio_context_acquire(ctx);
bdrv_set_aio_context(bs, qemu_get_aio_context());
aio_context_release(ctx);
}
object_child_foreach(container, iothread_stop, NULL);
}