backing_file_splice_write
EXPORT_SYMBOL_GPL(backing_file_splice_write);
ret = backing_file_splice_write(pipe, backing_file, &iocb, len, flags, &ctx);
ret = backing_file_splice_write(pipe, realfile, &iocb, len, flags, &ctx);
ssize_t backing_file_splice_write(struct pipe_inode_info *pipe,