dir.c

基于UNIX6的文件系统模拟程序

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


_dir()
{
	unsigned int di_mode;
	int i,one,j,k;
	struct inode *temp_inode;

	//printf("\nCURRENT DIRECTORY :\n");
	printf("\n");
	for(i=0;i<dir.size;i++)
	{
		if(dir.direct[i].d_ino != DIEMPTY)
		{
			printf("%-14s",dir.direct[i].d_name);
			temp_inode=iget(dir.direct[i].d_ino);
			di_mode=temp_inode->di_mode;
			//printf("mode:%p",di_mode);
			for(j=0;j<9;j++)
			{
				one = di_mode % 2;
				di_mode = di_mode/2;

				if(one) printf("x");
				else printf("-");
			}
			if((temp_inode->di_mode&DIFILE) == DIFILE)
			{
				printf("%5d\t",temp_inode->di_size);
				printf("block chain:");
				for(k=0;k<(temp_inode->di_size-1)/BLOCKSIZ+1;k++)
					printf("%4d",temp_inode->di_addr[k]);
				printf("\n");
			}
			else
				printf("<dir>\n");
			iput(temp_inode);
		}
	}
}


mkdir(dirname)
char *dirname;
{
	int dirid,dirpos;
	struct inode *inode;
	struct direct buf[BLOCKSIZ/(DIRSIZ+2)];
	unsigned int block;

	dirid=namei(dirname);
	if(dirid != NULL)
	{
		inode = iget(dirid);
		if(inode->di_mode&DIDIR)
			printf("\n%s directory already existed!!\n");
		else
			printf("\n%s is a file name,&can't creat a dir with the same name",dirname);
		iput(inode);
		return;
	}

	dirpos=iname(dirname);
	inode=ialloc();
	dirid=inode->i_ino;
	dir.direct[dirpos].d_ino=inode->i_ino;
	dir.size++;

	//printf("\ncur dir name :%s",dir.direct[0].d_name);


	/* fill the new dir buf */
	strcpy(buf[0].d_name,".");
	buf[0].d_ino=dirid;
	strcpy(buf[1].d_name,"..");
	buf[1].d_ino=cur_path_inode->i_ino;

	block=balloc();
	fseek(fd,DATASTART+block*BLOCKSIZ,SEEK_SET);
	fwrite(buf,1,BLOCKSIZ,fd);

	inode->di_size=2*(DIRSIZ+2);
	inode->di_number=1;
	inode->di_mode=user[user_id].u_default_mode;
	inode->di_uid=user[user_id].u_uid;
	inode->di_gid=user[user_id].u_gid;
	inode->di_addr[0]=block;

	iput(inode);

	return;
}


chdir(dirname)
char *dirname;
{
	unsigned int dirid;
	struct inode *inode;
	unsigned short block;
	int i,j,low=0,high=0;

	dirid=namei(dirname);
	if(dirid==NULL)
	{
		printf("\n%s does not existed\n",dirname);
		return;
	}
	inode=iget(dirid);//dirid+1
	if(!access(user_id,inode,EXICUTE))//user[user_id].u_default_mode
	{
		printf("\nhas not access to the directory %s",dirname);
		iput(inode);
		return;
	}

	/* pack the current directory */
	/*for(i=0;i<dir.size;i++)
	{
		for(j=0;j<DIRNUM;j++)
			if(dir.direct[j].d_ino==0) break;
		memcpy(&dir.direct[i],&dir.direct[j],DIRSIZ+2);
		dir.direct[j].d_ino=0;
	}*/ //I del this 'for' part

	/* write back the current directory */
	for(i=0;i<cur_path_inode->di_size/BLOCKSIZ+1;i++)
	{
		bfree(cur_path_inode->di_addr[i]);
	}
	for(i=0;i<dir.size;i+=BLOCKSIZ/(DIRSIZ+2))
	{
		block=balloc();
		cur_path_inode->di_addr[i]=block;
		fseek(fd,DATASTART+block*BLOCKSIZ,SEEK_SET);
		fwrite(&dir.direct[i],1,BLOCKSIZ,fd);
	}
	cur_path_inode->di_size=dir.size*(DIRSIZ+2);
	iput(cur_path_inode);

	cur_path_inode=inode;
	dir.size = cur_path_inode->di_size/(DIRSIZ +2);

//	printf("sfsf:%d",inode->i_ino);
	/* read the change dir from disk */
	j=0;
	for(i=0;i<inode->di_size/BLOCKSIZ+1;i++)
	{
		fseek(fd,DATASTART+inode->di_addr[i]*BLOCKSIZ,SEEK_SET);
		fread(&dir.direct[j],1,BLOCKSIZ,fd);
		j+=BLOCKSIZ/(DIRSIZ+2);
	}

	for(i=dir.size;i<DIRNUM;i++)
	{
		strcpy(dir.direct[i].d_name,"         ");
		dir.direct[i].d_ino = 0;
	}
	
//	printf("sfsfdir[3].ino:%d",dir.direct[2].d_ino);
	return;
}