Commit 8031c3dd authored Aug 17, 2017 by Shaohua Li

md/bitmap: copy correct data for bitmap super



raid5 cache could write bitmap superblock before bitmap superblock is
initialized. The bitmap superblock is less than 512B. The current code will
only copy the superblock to a new page and write the whole 512B, which will
zero the the data after the superblock. Unfortunately the data could include
bitmap, which we should preserve. The patch will make superblock read do 4k
chunk and we always copy the 4k data to new page, so the superblock write will
old data to disk and we don't change the bitmap.

Reported-by: Song Liu <songliubraving@fb.com>
Reviewed-by: Song Liu <songliubraving@fb.com>
Cc: stable@vger.kernel.org (4.10+)
Signed-off-by: Shaohua Li <shli@fb.com>

parent 143c97cc

drivers/md/bitmap.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -625,7 +625,7 @@ re_read:
		err = read_sb_page(bitmap->mddev,
		offset,
		sb_page,
		0, sizeof(bitmap_super_t));
		0, PAGE_SIZE);
		}
		if (err)
		return err;
		@@ -2118,7 +2118,7 @@ int bitmap_resize(struct bitmap *bitmap, sector_t blocks,
		if (store.sb_page && bitmap->storage.sb_page)
		memcpy(page_address(store.sb_page),
		page_address(bitmap->storage.sb_page),
		sizeof(bitmap_super_t));
		PAGE_SIZE);
		bitmap_file_unmap(&bitmap->storage);
		bitmap->storage = store;

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