wb_inode
tail = wb_inode(wb->b_dirty.next);
inode = wb_inode(delaying_queue->prev);
sb = wb_inode(tmp.prev)->i_sb;
inode = wb_inode(pos);
struct inode *inode = wb_inode(wb->b_io.prev);
struct inode *inode = wb_inode(wb->b_io.prev);
inode = wb_inode(wb->b_more_io.prev);