#include
#include“filesys.h“
unsigned?int?access（user_iinodemode）
unsigned?int?user_id;
struct?inode*inode;
unsigned?short?mode;
{
switch（mode）
{
case?READ:
if（inode->di_mode&ODIREAD）?return?1;
if（inode->di_mode&GDIREAD）
&&（（user[user_id].u_gid==inode->di_gid））?retun?1;
if（（inode->di_mode&UDIREAD）&&（user[user_id].u_uid==inode->di_uid））??return?1;
retrun?0;
case?WRITE:
if（inode->di_mode&ODIWRITE）?return?1;
if（inode->