get_pipe_info
pipe = get_pipe_info(file, false);
opipe = get_pipe_info(fd_file(out), true);
ipipe = get_pipe_info(in, true);
opipe = get_pipe_info(out, true);
ipipe = get_pipe_info(in, true);
opipe = get_pipe_info(out, true);
struct pipe_inode_info *pipe = get_pipe_info(file, true);
pipe = get_pipe_info(file, true);
struct pipe_inode_info *ipipe = get_pipe_info(in, true);
struct pipe_inode_info *opipe = get_pipe_info(out, true);
struct pipe_inode_info *get_pipe_info(struct file *file, bool for_splice);
pipe = get_pipe_info(fd_file(f), false);