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md: export helpers to stop sync_thread

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Add new helpers:

  void md_idle_sync_thread(struct mddev *mddev);
  void md_frozen_sync_thread(struct mddev *mddev);
  void md_unfrozen_sync_thread(struct mddev *mddev);

The helpers will be used in dm-raid in later patches to fix regressions
and prevent calling md_reap_sync_thread() directly.

Cc: stable@vger.kernel.org # v6.7+
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Signed-off-by: Xiao Ni <xni@redhat.com>
Acked-by: Mike Snitzer <snitzer@kernel.org>
Signed-off-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/r/20240305072306.2562024-3-yukuai1@huaweicloud.com
This commit is contained in:
Yu Kuai 2024-03-05 15:22:59 +08:00 committed by Song Liu
parent 2f03d0c2cd
commit 7a2347e284
2 changed files with 32 additions and 0 deletions
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29
drivers/md/md.c
View File

@ -4942,6 +4942,35 @@ static void stop_sync_thread(struct mddev *mddev, bool locked, bool check_seq)
mddev_lock_nointr(mddev);
}
void md_idle_sync_thread(struct mddev *mddev)
{
lockdep_assert_held(&mddev->reconfig_mutex);
clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
stop_sync_thread(mddev, true, true);
}
EXPORT_SYMBOL_GPL(md_idle_sync_thread);
void md_frozen_sync_thread(struct mddev *mddev)
{
lockdep_assert_held(&mddev->reconfig_mutex);
set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
stop_sync_thread(mddev, true, false);
}
EXPORT_SYMBOL_GPL(md_frozen_sync_thread);
void md_unfrozen_sync_thread(struct mddev *mddev)
{
lockdep_assert_held(&mddev->reconfig_mutex);
clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
md_wakeup_thread(mddev->thread);
sysfs_notify_dirent_safe(mddev->sysfs_action);
}
EXPORT_SYMBOL_GPL(md_unfrozen_sync_thread);
static void idle_sync_thread(struct mddev *mddev)
{
mutex_lock(&mddev->sync_mutex);

3
drivers/md/md.h
View File

@ -792,6 +792,9 @@ extern void md_rdev_clear(struct md_rdev *rdev);
extern void md_handle_request(struct mddev *mddev, struct bio *bio);
extern int mddev_suspend(struct mddev *mddev, bool interruptible);
extern void mddev_resume(struct mddev *mddev);
extern void md_idle_sync_thread(struct mddev *mddev);
extern void md_frozen_sync_thread(struct mddev *mddev);
extern void md_unfrozen_sync_thread(struct mddev *mddev);
extern void md_reload_sb(struct mddev *mddev, int raid_disk);
extern void md_update_sb(struct mddev *mddev, int force);