Btrfs: use wrapper page_offset
Use wrapper page_offset to get byte-offset into filesystem object for page.
Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 4438aac..a762f91 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -420,7 +420,7 @@
static int csum_dirty_buffer(struct btrfs_root *root, struct page *page)
{
struct extent_io_tree *tree;
- u64 start = (u64)page->index << PAGE_CACHE_SHIFT;
+ u64 start = page_offset(page);
u64 found_start;
struct extent_buffer *eb;