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From: Yu Kuai <yukuai1@huaweicloud.com>
To: xni@redhat.com,
	zkabelac@redhat.com,
	agk@redhat.com,
	snitzer@kernel.org,
	mpatocka@redhat.com,
	dm-devel@lists.linux.dev,
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Cc: linux-kernel@vger.kernel.org,
	linux-raid@vger.kernel.org,
	yukuai1@huaweicloud.com,
	yi.zhang@huawei.com,
	yangerkun@huawei.com
Subject: [PATCH md-6.8 v2 2/9] md: export helpers to stop sync_thread
Date: Tue,  5 Mar 2024 15:22:59 +0800
Message-Id: <20240305072306.2562024-3-yukuai1@huaweicloud.com>
In-Reply-To: <20240305072306.2562024-1-yukuai1@huaweicloud.com>
References: <20240305072306.2562024-1-yukuai1@huaweicloud.com>
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From: Yu Kuai <yukuai3@huawei.com>

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

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Signed-off-by: Xiao Ni <xni@redhat.com>
Acked-by: Mike Snitzer <snitzer@kernel.org>
---
 drivers/md/md.c | 29 +++++++++++++++++++++++++++++
 drivers/md/md.h |  3 +++
 2 files changed, 32 insertions(+)

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 23f31fd1d024..22e7512a5b1e 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -4919,6 +4919,35 @@ 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 8d881cc59799..437ab70ce79b 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -781,6 +781,9 @@ 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);
-- 
2.39.2