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md-cluster/bitmap: fix wrong calcuation of offset

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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>
This commit is contained in:
Guoqing Jiang 2016-05-02 11:50:13 -04:00 committed by Shaohua Li
parent 18c9ff7f48
commit 7f86ffed9b
1 changed files with 1 additions and 1 deletions
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2
drivers/md/bitmap.c
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@ -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);