Man page 9 : splice_from_pipe_feed

splice_from_pipe_feed - feed available data from a pipe to a file

int splice_from_pipe_feed(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 loops over the pipe and calls actor to do the actual moving of a single struct pipe_buffer to the desired destination. It returns when thereAqs no more buffers left in the pipe or if the requested number of bytes (sd->total_len) have been copied. It returns a positive number (one) if the pipe needs to be filled with more data, zero if the required number of bytes have been copied and -errno on error.

This, together with splice_from_pipe_{begin,end,next}, may be used to implement the functionality of __splice_from_pipe when locking is required around copying the pipe buffers to the destination.