install.c

操作系统实验,文件系统,c语言实现的

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

install()
{
	int i,j;
	// 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. initialize 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;
		}
	}
	//5. 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<DIRNUM;i++)
	{
		strcpy(dir.direct[i].d_name,"abcd12");
		dir.direct[i].d_ino=0;
	}
	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,fd);
}