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authorGuoqing Jiang <gqjiang@suse.com>2016-05-02 11:50:13 -0400
committerShaohua Li <shli@fb.com>2016-05-04 12:39:35 -0700
commit7f86ffed9b5f3f0b1a29108c5e965942b935ec98 (patch)
tree35c6119e19c7da003a541708e1143fea77dd2530 /drivers/md
parent18c9ff7f487efa8e88886bee21bd3516dde05bc5 (diff)
downloadlinux-7f86ffed9b5f3f0b1a29108c5e965942b935ec98.tar.bz2
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>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/bitmap.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index ac93d874578a..cf93bb80aff7 100644
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -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);