btrfs: pass a btrfs_inode to btrfs_readdir_get_delayed_items()

Pass a struct btrfs_inode to btrfs_readdir_get_delayed_items() as it's
an internal interface, allowing to remove some use of BTRFS_I.

Reviewed-by: Boris Burkov <[e-mail]>
Signed-off-by: David Sterba <[e-mail]>

fs/btrfs/delayed-inode.c

···
 	return 0;
 }
 
-bool btrfs_readdir_get_delayed_items(struct inode *inode,
+bool btrfs_readdir_get_delayed_items(struct btrfs_inode *inode,
 				     u64 last_index,
 				     struct list_head *ins_list,
 				     struct list_head *del_list)
···
 	struct btrfs_delayed_node *delayed_node;
 	struct btrfs_delayed_item *item;
 
-	delayed_node = btrfs_get_delayed_node(BTRFS_I(inode));
+	delayed_node = btrfs_get_delayed_node(inode);
 	if (!delayed_node)
 		return false;
 
···
 	 * We can only do one readdir with delayed items at a time because of
 	 * item->readdir_list.
 	 */
-	btrfs_inode_unlock(BTRFS_I(inode), BTRFS_ILOCK_SHARED);
-	btrfs_inode_lock(BTRFS_I(inode), 0);
+	btrfs_inode_unlock(inode, BTRFS_ILOCK_SHARED);
+	btrfs_inode_lock(inode, 0);
 
 	mutex_lock(&delayed_node->mutex);
 	item = __btrfs_first_delayed_insertion_item(delayed_node);

fs/btrfs/delayed-inode.h

···
 void btrfs_destroy_delayed_inodes(struct btrfs_fs_info *fs_info);
 
 /* Used for readdir() */
-bool btrfs_readdir_get_delayed_items(struct inode *inode,
+bool btrfs_readdir_get_delayed_items(struct btrfs_inode *inode,
 				     u64 last_index,
 				     struct list_head *ins_list,
 				     struct list_head *del_list);

fs/btrfs/inode.c

···
 	addr = private->filldir_buf;
 	path->reada = READA_FORWARD;
 
-	put = btrfs_readdir_get_delayed_items(inode, private->last_index,
+	put = btrfs_readdir_get_delayed_items(BTRFS_I(inode), private->last_index,
 					      &ins_list, &del_list);
 
 again: