Commit 7f86ffed authored May 02, 2016 by Guoqing Jiang Committed by Shaohua Li May 04, 2016

md-cluster/bitmap: fix wrong calcuation of offset



The offset is wrong in bitmap_storage_alloc, we should
set it like below in bitmap_init_from_disk().

node_offset = bitmap->cluster_slot * (DIV_ROUND_UP(store->bytes, PAGE_SIZE));

Because 'offset' is only assigned to 'page->index' and
that is usually over-written by read_sb_page. So it does
not cause problem in general, but it still need to be fixed.

Reviewed-by: NeilBrown <neilb@suse.com>
Signed-off-by: Guoqing Jiang <gqjiang@suse.com>
Signed-off-by: Shaohua Li <shli@fb.com>

parent 18c9ff7f

drivers/md/bitmap.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -759,7 +759,7 @@ static int bitmap_storage_alloc(struct bitmap_storage *store,
		bytes += sizeof(bitmap_super_t);

		num_pages = DIV_ROUND_UP(bytes, PAGE_SIZE);
		offset = slot_number * (num_pages - 1);
		offset = slot_number * num_pages;

		store->filemap = kmalloc(sizeof(struct page *)
		* num_pages, GFP_KERNEL);