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md/raid10: factor out code from wait_barrier() to stop_waiting_barrier()

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Currently the nasty condition in wait_barrier() is hard to read. This
patch factors out the condition into a function.

There are no functional changes.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Acked-by: Paul Menzel <pmenzel@molgen.mpg.de>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Acked-by: Guoqing Jiang <guoqing.jiang@linux.dev>
Signed-off-by: Song Liu <song@kernel.org>
This commit is contained in:
Yu Kuai 2022-09-16 19:34:24 +08:00 committed by Song Liu
parent 3bfc3bcd78
commit ed2e063f92
1 changed files with 28 additions and 22 deletions
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50
drivers/md/raid10.c
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@ -957,41 +957,47 @@ static void lower_barrier(struct r10conf *conf)
wake_up(&conf->wait_barrier);
}
static bool stop_waiting_barrier(struct r10conf *conf)
{
struct bio_list *bio_list = current->bio_list;
/* barrier is dropped */
if (!conf->barrier)
return true;
/*
* If there are already pending requests (preventing the barrier from
* rising completely), and the pre-process bio queue isn't empty, then
* don't wait, as we need to empty that queue to get the nr_pending
* count down.
*/
if (atomic_read(&conf->nr_pending) && bio_list &&
(!bio_list_empty(&bio_list[0]) || !bio_list_empty(&bio_list[1])))
return true;
/* move on if recovery thread is blocked by us */
if (conf->mddev->thread->tsk == current &&
test_bit(MD_RECOVERY_RUNNING, &conf->mddev->recovery) &&
conf->nr_queued > 0)
return true;
return false;
}
static bool wait_barrier(struct r10conf *conf, bool nowait)
{
bool ret = true;
spin_lock_irq(&conf->resync_lock);
if (conf->barrier) {
struct bio_list *bio_list = current->bio_list;
conf->nr_waiting++;
/* Wait for the barrier to drop.
* However if there are already pending
* requests (preventing the barrier from
* rising completely), and the
* pre-process bio queue isn't empty,
* then don't wait, as we need to empty
* that queue to get the nr_pending
* count down.
*/
/* Return false when nowait flag is set */
if (nowait) {
ret = false;
} else {
raid10_log(conf->mddev, "wait barrier");
wait_event_lock_irq(conf->wait_barrier,
!conf->barrier ||
(atomic_read(&conf->nr_pending) &&
bio_list &&
(!bio_list_empty(&bio_list[0]) ||
!bio_list_empty(&bio_list[1]))) ||
/* move on if recovery thread is
* blocked by us
*/
(conf->mddev->thread->tsk == current &&
test_bit(MD_RECOVERY_RUNNING,
&conf->mddev->recovery) &&
conf->nr_queued > 0),
stop_waiting_barrier(conf),
conf->resync_lock);
}
conf->nr_waiting--;