linux-kernel - [PATCH] md/md-bitmap: fix stats collection for external bitmaps

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Message-Id: <20250402011523.2271768-1-zhengqixing@huaweicloud.com>
Date: Wed,  2 Apr 2025 09:15:23 +0800
From: Zheng Qixing <zhengqixing@...weicloud.com>
To: song@...nel.org,
	yukuai3@...wei.com
Cc: linux-raid@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	yi.zhang@...wei.com,
	yangerkun@...wei.com,
	zhengqixing@...wei.com
Subject: [PATCH] md/md-bitmap: fix stats collection for external bitmaps

From: Zheng Qixing <zhengqixing@...wei.com>

The bitmap_get_stats() function incorrectly returns -ENOENT for external
bitmaps, preventing statistics collection when a valid superblock page
exists.

Remove the external bitmap check as the statistics should be available
regardless of bitmap storage location when sb_page is present.

Note: "bitmap_info.external" here refers to a bitmap stored in a separate
file (bitmap_file), not to external metadata.

Fixes: 8d28d0ddb986 ("md/md-bitmap: Synchronize bitmap_get_stats() with bitmap lifetime")
Signed-off-by: Zheng Qixing <zhengqixing@...wei.com>
---
 drivers/md/md-bitmap.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index 44ec9b17cfd3..afd01c93ddd9 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -2357,8 +2357,6 @@ static int bitmap_get_stats(void *data, struct md_bitmap_stats *stats)
 
 	if (!bitmap)
 		return -ENOENT;
-	if (bitmap->mddev->bitmap_info.external)
-		return -ENOENT;
 	if (!bitmap->storage.sb_page) /* no superblock */
 		return -EINVAL;
 	sb = kmap_local_page(bitmap->storage.sb_page);
-- 
2.39.2