#include <u.h>#include <libc.h>#include <../boot/boot.h> intcache(int fd){	int p[2];	char d[DIRLEN];	char partition[2*NAMELEN]; 	if(stat("/cfs", d) < 0)		return fd;	sprint(partition, "%scache", bootdisk);	if(stat(partition, d) < 0)		return fd;	print("cfs...");	if(pipe(p)<0)		fatal("pipe");	switch(fork()){	case -1:		fatal("fork");	case 0:		close(p[1]);		dup(fd, 0);		close(fd);		dup(p[0], 1);		close(p[0]);		if(fflag)			execl("/cfs", "bootcfs", "-rs", "-f", partition, 0);		else			execl("/cfs", "bootcfs", "-s", "-f", partition, 0);		break;	default:		close(p[0]);		close(fd);		fd = p[1];		break;	}	return fd;}