linux-kernel - [PATCH v2 md-6.14 09/12] md/raid10: check before deferencing mddev->bitmap

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Message-Id: <20250109015704.216128-10-yukuai1@huaweicloud.com>
Date: Thu,  9 Jan 2025 09:57:01 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
To: song@...nel.org,
	yukuai3@...wei.com,
	agk@...hat.com,
	snitzer@...nel.org,
	mpatocka@...hat.com
Cc: linux-raid@...r.kernel.org,
	dm-devel@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	yukuai1@...weicloud.com,
	yi.zhang@...wei.com,
	yangerkun@...wei.com
Subject: [PATCH v2 md-6.14 09/12] md/raid10: check before deferencing mddev->bitmap_ops

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

Prepare to support building bitmap as kernel module.

Signed-off-by: Yu Kuai <yukuai3@...wei.com>
---
 drivers/md/raid10.c | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index f448b5d9faf3..ed5e6a49523a 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -3254,7 +3254,8 @@ static sector_t raid10_sync_request(struct mddev *mddev, sector_t sector_nr,
 			}
 			conf->fullsync = 0;
 		}
-		mddev->bitmap_ops->close_sync(mddev);
+		if (md_bitmap_enabled(mddev))
+			mddev->bitmap_ops->close_sync(mddev);
 		close_sync(conf);
 		*skipped = 1;
 		return sectors_skipped;
@@ -3573,7 +3574,8 @@ static sector_t raid10_sync_request(struct mddev *mddev, sector_t sector_nr,
 		 * safety reason, which ensures curr_resync_completed is
 		 * updated in bitmap_cond_end_sync.
 		 */
-		mddev->bitmap_ops->cond_end_sync(mddev, sector_nr,
+		if (md_bitmap_enabled(mddev))
+			mddev->bitmap_ops->cond_end_sync(mddev, sector_nr,
 					mddev_is_clustered(mddev) &&
 					(sector_nr + 2 * RESYNC_SECTORS > conf->cluster_sync_high));
 
@@ -4229,7 +4231,6 @@ static int raid10_resize(struct mddev *mddev, sector_t sectors)
 	 */
 	struct r10conf *conf = mddev->private;
 	sector_t oldsize, size;
-	int ret;
 
 	if (mddev->reshape_position != MaxSector)
 		return -EBUSY;
@@ -4243,9 +4244,12 @@ static int raid10_resize(struct mddev *mddev, sector_t sectors)
 	    mddev->array_sectors > size)
 		return -EINVAL;
 
-	ret = mddev->bitmap_ops->resize(mddev, size, 0);
-	if (ret)
-		return ret;
+	if (md_bitmap_enabled(mddev)) {
+		int ret = mddev->bitmap_ops->resize(mddev, size, 0);
+
+		if (ret)
+			return ret;
+	}
 
 	md_set_array_sectors(mddev, size);
 	if (sectors > mddev->dev_sectors &&
@@ -4511,7 +4515,7 @@ static int raid10_start_reshape(struct mddev *mddev)
 		oldsize = raid10_size(mddev, 0, 0);
 		newsize = raid10_size(mddev, 0, conf->geo.raid_disks);
 
-		if (!mddev_is_clustered(mddev)) {
+		if (!mddev_is_clustered(mddev) && md_bitmap_enabled(mddev)) {
 			ret = mddev->bitmap_ops->resize(mddev, newsize, 0);
 			if (ret)
 				goto abort;
@@ -4534,6 +4538,7 @@ static int raid10_start_reshape(struct mddev *mddev)
 			    MD_FEATURE_RESHAPE_ACTIVE)) || (oldsize == newsize))
 			goto out;
 
+		/* cluster can't be setup without bitmap */
 		ret = mddev->bitmap_ops->resize(mddev, newsize, 0);
 		if (ret)
 			goto abort;
-- 
2.39.2