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md/md-bitmap: fix stats collection for external bitmaps

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The bitmap_get_stats() function incorrectly returns -ENOENT for external
bitmaps.

Remove the external bitmap check as the statistics should be available
regardless of bitmap storage location.

Return -EINVAL only for invalid bitmap with no storage (neither in
superblock nor in external file).

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

Fixes: 8d28d0ddb9 ("md/md-bitmap: Synchronize bitmap_get_stats() with bitmap lifetime")
Signed-off-by: Zheng Qixing <zhengqixing@huawei.com>
Link: https://lore.kernel.org/linux-raid/20250403015322.2873369-1-zhengqixing@huaweicloud.com
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
This commit is contained in:
Zheng Qixing 2025-04-03 09:53:22 +08:00 • committed by Yu Kuai
parent d05af90d62
commit 6ec1f02394
1 changed files with 2 additions and 3 deletions
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5
drivers/md/md-bitmap.c
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@ -2357,9 +2357,8 @@ 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 */
if (!bitmap->mddev->bitmap_info.external &&
!bitmap->storage.sb_page)
return -EINVAL;
sb = kmap_local_page(bitmap->storage.sb_page);
stats->sync_size = le64_to_cpu(sb->sync_size);