linux-kernel - [PATCH v2 1/2] md: Fix logical_block_size configuration being overwritten

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Message-Id: <20251225121311.1992029-1-linan666@huaweicloud.com>
Date: Thu, 25 Dec 2025 20:13:10 +0800
From: linan666@...weicloud.com
To: song@...nel.org,
	yukuai@...as.com,
	xni@...hat.com,
	linan122@...wei.com
Cc: linux-raid@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	bugreports61@...il.com,
	linan666@...weicloud.com,
	yangerkun@...wei.com,
	yi.zhang@...wei.com
Subject: [PATCH v2 1/2] md: Fix logical_block_size configuration being overwritten

From: Li Nan <linan122@...wei.com>

In super_1_validate(), mddev->logical_block_size is directly overwritten
with the value from metadata. This causes the previously configured lbs
to be lost, making the configuration ineffective. Fix it.

Fixes: 62ed1b582246 ("md: allow configuring logical block size")
Signed-off-by: Li Nan <linan122@...wei.com>
Reviewed-by: Yu Kuai <yukuai@...as.com>
---
 drivers/md/md.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/md/md.c b/drivers/md/md.c
index e5922a682953..7c0dd94a4d25 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -1999,7 +1999,6 @@ static int super_1_validate(struct mddev *mddev, struct md_rdev *freshest, struc
 		mddev->layout = le32_to_cpu(sb->layout);
 		mddev->raid_disks = le32_to_cpu(sb->raid_disks);
 		mddev->dev_sectors = le64_to_cpu(sb->size);
-		mddev->logical_block_size = le32_to_cpu(sb->logical_block_size);
 		mddev->events = ev1;
 		mddev->bitmap_info.offset = 0;
 		mddev->bitmap_info.space = 0;
@@ -2015,6 +2014,9 @@ static int super_1_validate(struct mddev *mddev, struct md_rdev *freshest, struc
 
 		mddev->max_disks =  (4096-256)/2;
 
+		if (!mddev->logical_block_size)
+			mddev->logical_block_size = le32_to_cpu(sb->logical_block_size);
+
 		if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
 		    mddev->bitmap_info.file == NULL) {
 			mddev->bitmap_info.offset =
-- 
2.39.2