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block: all I/O should be completed before removing throttle timers. 

In blk_remove_bs, all I/O should be completed before removing throttle
timers. If there has inflight I/O, removing throttle timers here will
cause the inflight I/O never return.
This patch add bdrv_drained_begin before throttle_timers_detach_aio_context
to let all I/O completed before removing throttle timers.

[Moved declaration of bs as suggested by Alberto Garcia
<berto@igalia.com>.
--Stefan]

Signed-off-by: Zhengui <lizhengui@huawei.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Message-id: 1508564040-120700-1-git-send-email-lizhengui@huawei.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Zhengui 2017-10-21 13:34:00 +08:00 committed by Stefan Hajnoczi
parent 508ba0f7e2
commit 632a773543
1 changed files with 4 additions and 0 deletions
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4
block/block-backend.c
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@ -655,12 +655,16 @@ BlockBackend *blk_by_public(BlockBackendPublic *public)
*/
void blk_remove_bs(BlockBackend *blk)
{
BlockDriverState *bs;
ThrottleTimers *tt;
notifier_list_notify(&blk->remove_bs_notifiers, blk);
if (blk->public.throttle_group_member.throttle_state) {
tt = &blk->public.throttle_group_member.throttle_timers;
bs = blk_bs(blk);
bdrv_drained_begin(bs);
throttle_timers_detach_aio_context(tt);
bdrv_drained_end(bs);
}
blk_update_root_state(blk);