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

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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: Yu Kuai <yukuai3@huawei.com>
Signed-off-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/r/20231010151958.145896-6-yukuai1@huaweicloud.com
This commit is contained in:
Yu Kuai 2023-10-10 23:19:44 +08:00 committed by Song Liu
parent 714d20150e
commit f45461e24f
1 changed files with 27 additions and 0 deletions
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27
drivers/md/md.h
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@ -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;