Commit f45461e2 authored by Yu Kuai's avatar Yu Kuai Committed by Song Liu
Browse files

md: add new helpers to suspend/resume and lock/unlock array 



The new helpers suspend the array first and then lock the array,

Prepare to refactor from:

mddev_lock/lock_nointr
mddev_suspend
...
mddev_resuem
mddev_lock

With:

mddev_suspend_and_lock/lock_nointr
...
mddev_unlock_and_resume

After all the use cases is refactored, mddev_suspend/resume() will be
removed.

And mddev_suspend_and_lock() will also replace mddev_lock() for the case
that the array will be reconfigured, in order to synchronize with io to
prevent problems in many corner cases.

Signed-off-by: default avatarYu Kuai <yukuai3@huawei.com>
Signed-off-by: default avatarSong Liu <song@kernel.org>
Link: https://lore.kernel.org/r/20231010151958.145896-6-yukuai1@huaweicloud.com
parent 714d2015

drivers/md/md.h

+27 −0
Original line number Diff line number Diff line
@@ -858,6 +858,33 @@ static inline void mddev_check_write_zeroes(struct mddev *mddev, struct bio *bio 
		mddev->queue->limits.max_write_zeroes_sectors = 0;

}



static inline int mddev_suspend_and_lock(struct mddev *mddev)

{

	int ret;



	ret = __mddev_suspend(mddev, true);

	if (ret)

		return ret;



	ret = mddev_lock(mddev);

	if (ret)

		__mddev_resume(mddev);



	return ret;

}



static inline void mddev_suspend_and_lock_nointr(struct mddev *mddev)

{

	__mddev_suspend(mddev, false);

	mutex_lock(&mddev->reconfig_mutex);

}



static inline void mddev_unlock_and_resume(struct mddev *mddev)

{

	mddev_unlock(mddev);

	__mddev_resume(mddev);

}



struct mdu_array_info_s;

struct mdu_disk_info_s;