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block: introduce bdrv_no_throttling_begin/end

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Extract the handling of throttling from bdrv_flush_io_queue.  These
new functions will soon become BdrvChildRole callbacks, as they can
be generalized to "beginning of drain" and "end of drain".

Reviewed-by: Alberto Garcia <berto@igalia.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Paolo Bonzini 2016-04-07 18:33:33 +02:00 • committed by Kevin Wolf
parent b6e84c97ed
commit ce0f141259
5 changed files with 33 additions and 20 deletions
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4
block/throttle-groups.c
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@ -219,6 +219,10 @@ static bool throttle_group_schedule_timer(BlockDriverState *bs,
ThrottleGroup *tg = container_of(ts, ThrottleGroup, ts);
bool must_wait;
if (bs->io_limits_disabled) {
return false;
}
/* Check if any of the timers in this group is already armed */
if (tg->any_timer_armed[is_write]) {
return true;