Man page 9 : __splice_from_pipe

__splice_from_pipe - splice data from a pipe to given actor

ssize_t __splice_from_pipe(struct pipe_inode_info *  pipe , struct splice_desc *  sd , splice_actor *  actor );

pipe
    pipe to splice from

sd
    information to actor

actor
    handler that splices the data

This function does little more than loop over the pipe and call actor to do the actual moving of a single struct pipe_buffer to the desired destination. See pipe_to_file, pipe_to_sendpage, or pipe_to_user.