linux-kernel - [PATCH RFC md-6.16 v3 09/19] md: add a new recovery_flag MD_RECOVERY_LAZY

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Message-Id: <20250512011927.2809400-10-yukuai1@huaweicloud.com>
Date: Mon, 12 May 2025 09:19:17 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
To: hch@....de,
	xni@...hat.com,
	colyli@...nel.org,
	agk@...hat.com,
	snitzer@...nel.org,
	mpatocka@...hat.com,
	song@...nel.org,
	yukuai3@...wei.com
Cc: linux-kernel@...r.kernel.org,
	dm-devel@...ts.linux.dev,
	linux-raid@...r.kernel.org,
	yukuai1@...weicloud.com,
	yi.zhang@...wei.com,
	yangerkun@...wei.com,
	johnny.chenyi@...wei.com
Subject: [PATCH RFC md-6.16 v3 09/19] md: add a new recovery_flag MD_RECOVERY_LAZY_RECOVER

From: Yu Kuai <yukuai3@...wei.com>

This flag is used by llbitmap in later patches to skip raid456 initial
recover and delay building initial xor data to first write.

Signed-off-by: Yu Kuai <yukuai3@...wei.com>
---
 drivers/md/md.c | 12 +++++++++++-
 drivers/md/md.h |  2 ++
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/md/md.c b/drivers/md/md.c
index c23ee9c19cf9..a5dd7a403ea5 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -9133,6 +9133,14 @@ static sector_t md_sync_position(struct mddev *mddev, enum sync_action action)
 				start = rdev->recovery_offset;
 		rcu_read_unlock();
 
+		/*
+		 * If there are no spares, and raid456 lazy initial recover is
+		 * requested.
+		 */
+		if (test_bit(MD_RECOVERY_LAZY_RECOVER, &mddev->recovery) &&
+		    start == MaxSector)
+			start = 0;
+
 		/* If there is a bitmap, we need to make sure all
 		 * writes that started before we added a spare
 		 * complete before we start doing a recovery.
@@ -9697,6 +9705,7 @@ static bool md_choose_sync_action(struct mddev *mddev, int *spares)
 	if (mddev->recovery_cp < MaxSector) {
 		set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
 		clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
+		clear_bit(MD_RECOVERY_LAZY_RECOVER, &mddev->recovery);
 		return true;
 	}
 
@@ -9706,7 +9715,7 @@ static bool md_choose_sync_action(struct mddev *mddev, int *spares)
 	 * re-add.
 	 */
 	*spares = remove_and_add_spares(mddev, NULL);
-	if (*spares) {
+	if (*spares || test_bit(MD_RECOVERY_LAZY_RECOVER, &mddev->recovery)) {
 		clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
 		clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
 		clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
@@ -10029,6 +10038,7 @@ void md_reap_sync_thread(struct mddev *mddev)
 	clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
 	clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
 	clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
+	clear_bit(MD_RECOVERY_LAZY_RECOVER, &mddev->recovery);
 	/*
 	 * We call mddev->cluster_ops->update_size here because sync_size could
 	 * be changed by md_update_sb, and MD_RECOVERY_RESHAPE is cleared,
diff --git a/drivers/md/md.h b/drivers/md/md.h
index 99f6c7a92b48..0c89bf0e8e4f 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -667,6 +667,8 @@ enum recovery_flags {
 	MD_RECOVERY_RESHAPE,
 	/* remote node is running resync thread */
 	MD_RESYNCING_REMOTE,
+	/* raid456 lazy initial recover */
+	MD_RECOVERY_LAZY_RECOVER,
 };
 
 enum md_ro_state {
-- 
2.39.2