Btrfs: add leaf data casting helper

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 2 insertions, 6 deletions

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 7f156d9b7089..3767744f659e 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -41,9 +41,7 @@ static int inc_block_ref(struct btrfs_root *root, u64 blocknr)
                 BUG();
         BUG_ON(ret != 0);
         l = &path.nodes[0]->leaf;
-        item = (struct btrfs_extent_item *)(l->data +
-                                            btrfs_item_offset(l->items +
-                                                              path.slots[0]));
+        item = btrfs_item_ptr(l, path.slots[0], struct btrfs_extent_item);
         refs = btrfs_extent_refs(item);
         btrfs_set_extent_refs(item, refs + 1);
 
@@ -69,9 +67,7 @@ static int lookup_block_ref(struct btrfs_root *root, u64 blocknr, u32 *refs)
         if (ret != 0)
                 BUG();
         l = &path.nodes[0]->leaf;
-        item = (struct btrfs_extent_item *)(l->data +
-                                      btrfs_item_offset(l->items +
-                                                        path.slots[0]));
+        item = btrfs_item_ptr(l, path.slots[0], struct btrfs_extent_item);
         *refs = btrfs_extent_refs(item);
         btrfs_release_path(root->extent_root, &path);
         return 0;