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md: suspend array in md_start_sync() if array need reconfiguration

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So that io won't concurrent with array reconfiguration, and it's safe to
suspend the array directly because normal io won't rely on
md_start_sync().

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Signed-off-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/r/20231010151958.145896-18-yukuai1@huaweicloud.com
This commit is contained in:
Yu Kuai 2023-10-10 23:19:56 +08:00 committed by Song Liu
parent b42cd7b3a2
commit bc08041b32
1 changed files with 8 additions and 3 deletions
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11
drivers/md/md.c
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@ -9417,8 +9417,13 @@ static void md_start_sync(struct work_struct *ws)
{
struct mddev *mddev = container_of(ws, struct mddev, sync_work);
int spares = 0;
bool suspend = false;
mddev_lock_nointr(mddev);
if (md_spares_need_change(mddev))
suspend = true;
suspend ? mddev_suspend_and_lock_nointr(mddev) :
mddev_lock_nointr(mddev);
if (!md_is_rdwr(mddev)) {
/*
@ -9454,7 +9459,7 @@ static void md_start_sync(struct work_struct *ws)
goto not_running;
}
mddev_unlock(mddev);
suspend ? mddev_unlock_and_resume(mddev) : mddev_unlock(mddev);
md_wakeup_thread(mddev->sync_thread);
sysfs_notify_dirent_safe(mddev->sysfs_action);
md_new_event();
@ -9466,7 +9471,7 @@ not_running:
clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
mddev_unlock(mddev);
suspend ? mddev_unlock_and_resume(mddev) : mddev_unlock(mddev);
wake_up(&resync_wait);
if (test_and_clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery) &&