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md/bitmap: md_bitmap_read_sb uses wrong bitmap blocks 

The patched code is used to get chunks number, should use round-up div
to replace current sector_div. The same code is in md_bitmap_resize():
```
chunks = DIV_ROUND_UP_SECTOR_T(blocks, 1 << chunkshift);
```

Signed-off-by: Zhao Heming <heming.zhao@suse.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
This commit is contained in:
Zhao Heming 2020-10-06 00:00:23 +08:00 committed by Song Liu
parent d7a1c483f7
commit a913096dec
1 changed files with 2 additions and 2 deletions
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4
drivers/md/md-bitmap.c
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@ -606,8 +606,8 @@ static int md_bitmap_read_sb(struct bitmap *bitmap)
if (bitmap->cluster_slot >= 0) {
sector_t bm_blocks = bitmap->mddev->resync_max_sectors;
sector_div(bm_blocks,
bitmap->mddev->bitmap_info.chunksize >> 9);
bm_blocks = DIV_ROUND_UP_SECTOR_T(bm_blocks,
(bitmap->mddev->bitmap_info.chunksize >> 9));
/* bits to bytes */
bm_blocks = ((bm_blocks+7) >> 3) + sizeof(bitmap_super_t);
/* to 4k blocks */