md: export helpers to stop sync_thread

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

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 0c4e00e8d485cf3c7842ccda65ecbbff1b06cb34..0bf2f7a53ed8d890ed0ef4d2305fbff13afbe4be 100644 (file)
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -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);

diff --git a/drivers/md/md.h b/drivers/md/md.h
index b2076a165c1050d84084b7e1adbd7c6b6abab3e8..dff2e333756d42ff8ab39e1ad88acbd3e4993483 100644 (file)
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -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);