rm.c

来自「操作系统简单的登入程序」· C语言 代码 · 共 64 行

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

int rmf(char* name)
{
	unsigned short nid,did;
	
	struct  inode *pinode,*pinode2;
	
	int i;

	nid=map2inode(name);
	
	did=dirname2id(name);

	//printf("%d ",nid);

	if(nid==MAPERR)
		return 0;

	pinode=(struct inode*)posinode(nid);

	pinode2=readdir2(currentuser);

	if(directory_2.direct[did].filetype==DIDIR)
		return 2;
	
	if(access(currentuser,pinode,WRITE))
	{
		 --(pinode->n_refer);
		
		if((pinode->n_refer)==0)
			
		{
			
			for(i=0;i<(pinode->di_size);i++)
			{
				bfree(pinode->di_addr[i]);
			}

			ifree(nid);
		}
		else
		{
			updateinodetable(pinode);
		}

		strcpy(directory_2.direct[did].name,"");

		directory_2.direct[did].filetype=DIEMPTY;

		directory_2.direct[did].d_ino=0;
	
		directory_2.size--;
	
		dir2todisk(&directory_2,pinode2);
		
		return 1;

	}

	return 2;

}