linux-kernel - [PATCH md-6.14 10/13] md/raid5: check before deferencing mddev->bitmap

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Message-Id: <20241225111546.1833250-11-yukuai1@huaweicloud.com>
Date: Wed, 25 Dec 2024 19:15:43 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
To: xni@...hat.com,
	agk@...hat.com,
	snitzer@...nel.org,
	mpatocka@...hat.com,
	song@...nel.org,
	yukuai3@...wei.com
Cc: dm-devel@...ts.linux.dev,
	linux-raid@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	yukuai1@...weicloud.com,
	yi.zhang@...wei.com,
	yangerkun@...wei.com
Subject: [PATCH md-6.14 10/13] md/raid5: 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/raid5.c | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index e56766733418..b228505c74ff 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -6496,7 +6496,8 @@ static inline sector_t raid5_sync_request(struct mddev *mddev, sector_t sector_n
 					   &sync_blocks);
 		else /* completed sync */
 			conf->fullsync = 0;
-		mddev->bitmap_ops->close_sync(mddev);
+		if (md_bitmap_enabled(mddev))
+			mddev->bitmap_ops->close_sync(mddev);
 
 		return 0;
 	}
@@ -6534,7 +6535,8 @@ static inline sector_t raid5_sync_request(struct mddev *mddev, sector_t sector_n
 		return sync_blocks * RAID5_STRIPE_SECTORS(conf);
 	}
 
-	mddev->bitmap_ops->cond_end_sync(mddev, sector_nr, false);
+	if (md_bitmap_enabled(mddev))
+		mddev->bitmap_ops->cond_end_sync(mddev, sector_nr, false);
 
 	sh = raid5_get_active_stripe(conf, NULL, sector_nr,
 				     R5_GAS_NOBLOCK);
@@ -6760,7 +6762,8 @@ static void raid5d(struct md_thread *thread)
 			/* Now is a good time to flush some bitmap updates */
 			conf->seq_flush++;
 			spin_unlock_irq(&conf->device_lock);
-			mddev->bitmap_ops->unplug(mddev, true);
+			if (md_bitmap_enabled(mddev))
+				mddev->bitmap_ops->unplug(mddev, true);
 			spin_lock_irq(&conf->device_lock);
 			conf->seq_write = conf->seq_flush;
 			activate_bit_delay(conf, conf->temp_inactive_list);
@@ -8309,7 +8312,6 @@ static int raid5_resize(struct mddev *mddev, sector_t sectors)
 	 */
 	sector_t newsize;
 	struct r5conf *conf = mddev->private;
-	int ret;
 
 	if (raid5_has_log(conf) || raid5_has_ppl(conf))
 		return -EINVAL;
@@ -8319,9 +8321,12 @@ static int raid5_resize(struct mddev *mddev, sector_t sectors)
 	    mddev->array_sectors > newsize)
 		return -EINVAL;
 
-	ret = mddev->bitmap_ops->resize(mddev, sectors, 0);
-	if (ret)
-		return ret;
+	if (md_bitmap_enabled(mddev)) {
+		int ret = mddev->bitmap_ops->resize(mddev, sectors, 0);
+
+		if (ret)
+			return ret;
+	}
 
 	md_set_array_sectors(mddev, newsize);
 	if (sectors > mddev->dev_sectors &&
-- 
2.39.2