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block: Pause block jobs in bdrv_drain_all 

This is necessary to suppress more IO requests from being generated from
block job coroutines.

Signed-off-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Message-id: 1428069921-2957-3-git-send-email-famz@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Fam Zheng 2015-04-03 22:05:19 +08:00 committed by Kevin Wolf
parent 751ebd76e6
commit 69da3b0b47
1 changed files with 20 additions and 0 deletions
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20
block.c
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@ -2040,6 +2040,16 @@ void bdrv_drain_all(void)
bool busy = true;
BlockDriverState *bs;
QTAILQ_FOREACH(bs, &bdrv_states, device_list) {
AioContext *aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
if (bs->job) {
block_job_pause(bs->job);
}
aio_context_release(aio_context);
}
while (busy) {
busy = false;
@ -2051,6 +2061,16 @@ void bdrv_drain_all(void)
aio_context_release(aio_context);
}
}
QTAILQ_FOREACH(bs, &bdrv_states, device_list) {
AioContext *aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
if (bs->job) {
block_job_resume(bs->job);
}
aio_context_release(aio_context);
}
}
/* make a BlockDriverState anonymous by removing from bdrv_state and