Splice data from a pipe to a file
ssize_t iter_file_splice_write(struct pipe_inode_info * pipe, struct file * out, loff_t * ppos, size_t len, unsigned int flags);
pipe
pipe info
out
file to write to
ppos
position in out
len
number of bytes to splice
flags
splice modifier flags
Will either move or copy pages (determined by flags options) from the given pipe inode to the given file. This one is ->write_iter-based.