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| author | Guoqing Jiang <gqjiang@suse.com> | 2016-05-02 11:50:13 -0400 |
|---|---|---|
| committer | Shaohua Li <shli@fb.com> | 2016-05-04 12:39:35 -0700 |
| commit | 7f86ffed9b5f3f0b1a29108c5e965942b935ec98 (patch) | |
| tree | 35c6119e19c7da003a541708e1143fea77dd2530 /drivers/md | |
| parent | 18c9ff7f487efa8e88886bee21bd3516dde05bc5 (diff) | |
| download | linux-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.c | 2 |
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); |