install.c

基于UNIX6的文件系统模拟程序

#include <stdio.h>
#include <string.h>
#include "filesys.h"

install()
{
	int i,j;

	//
	struct direct dir_buf[BLOCKSIZ / (DIRSIZ+2)];
	printf("installing disk...\nOK\n");
	/*0. open the file column */
	fd = fopen("filesystem","rb+");
	if(fd == NULL)
	{
		printf("\nfilesys can not be loaded\n");
		exit(0);
	}

	/* 1.read the filsys from the superblock */
	fseek(fd,BLOCKSIZ,SEEK_SET);
	fread(&filsys,1,sizeof(struct filsys),fd);

	/* 2. initialize the inode hash chain */
	for(i=0;i<NHINO;i++)
	{
		hinode[i].i_forw = NULL;//
	}

	/* 3. intialize the sys_ofile */
	for(i=0;i<SYSOPENFILE;i++)
	{
		sys_ofile[i].f_count = 0;
		sys_ofile[i].f_inode = NULL;
	}

	/* 4. initialize the user */
	for(i=0;i<USERNUM;i++)
	{
		user[i].u_uid = 0;
		user[i].u_gid = 0;
		for(j=0;j<NOFILE;j++)
		{
			user[i].u_ofile[j] = SYSOPENFILE + 1;
		}
	}

	/* read passwd*/
	fseek(fd,DATASTART+2*BLOCKSIZ,SEEK_SET);
	fread(pwd,1,BLOCKSIZ,fd);

//	printf("pwd[2].uid:%d ,pwd:%s",pwd[2].p_uid,pwd[2].password);

	/* read the main directory to initialize the dir */
	cur_path_inode = iget(1);
	dir.size = cur_path_inode->di_size/(DIRSIZ +2);
	
	for(i=0;i<dir.size/(BLOCKSIZ/(DIRSIZ+2));i++)
	{
		fseek(fd,DATASTART+BLOCKSIZ*cur_path_inode->di_addr[i],SEEK_SET);
		fread(&dir.direct[(BLOCKSIZ/(DIRSIZ+2))*i],1,BLOCKSIZ,fd);
	}
	
	fseek(fd,DATASTART+BLOCKSIZ*cur_path_inode->di_addr[i],SEEK_SET);
	fread(&dir.direct[(BLOCKSIZ/(DIRSIZ+2))*i],1,
		cur_path_inode->di_size%BLOCKSIZ + (DIRSIZ+2),fd);/*9*/

	for(i=dir.size;i<DIRNUM;i++)
	{
		strcpy(dir.direct[i].d_name,"         ");
		dir.direct[i].d_ino = 0;
	}
	//printf("\ndir.size:%d",dir.size);
	//printf("\ncur dir name :%s",dir.direct[2].d_name);
	//printf("\ncur dir[2] no :%d",dir.direct[2].d_ino);
}