sanchayanmaity/xv6-cs450
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simplify

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This commit is contained in:
rsc 2009-05-31 02:07:51 +00:00
parent 7f399ccaa4
commit f3685aa391
3 changed files with 17 additions and 30 deletions
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2
file.h
View file

@ -1,5 +1,5 @@
struct file {
enum { FD_CLOSED, FD_NONE, FD_PIPE, FD_INODE } type;
enum { FD_NONE, FD_PIPE, FD_INODE } type;
int ref; // reference count
char readable;
char writable;

8
pipe.c
View file

@ -47,14 +47,10 @@ pipealloc(struct file **f0, struct file **f1)
bad:
if(p)
kfree((char*)p, PAGE);
if(*f0){
(*f0)->type = FD_NONE;
if(*f0)
fileclose(*f0);
}
if(*f1){
(*f1)->type = FD_NONE;
if(*f1)
fileclose(*f1);
}
return -1;
}

37
sysfile.c
View file

@ -127,17 +127,17 @@ sys_link(void)
iunlock(ip);
if((dp = nameiparent(new, name)) == 0)
goto bad;
ilock(dp);
if(dp->dev != ip->dev || dirlink(dp, name, ip->inum) < 0)
goto bad;
ilock(dp);
if(dp->dev != ip->dev || dirlink(dp, name, ip->inum) < 0){
iunlockput(dp);
goto bad;
}
iunlockput(dp);
iput(ip);
return 0;
bad:
if(dp)
iunlockput(dp);
ilock(ip);
ip->nlink--;
iupdate(ip);
@ -212,7 +212,7 @@ sys_unlink(void)
}
static struct inode*
create(char *path, int canexist, short type, short major, short minor)
create(char *path, short type, short major, short minor)
{
uint off;
struct inode *ip, *dp;
@ -222,10 +222,10 @@ create(char *path, int canexist, short type, short major, short minor)
return 0;
ilock(dp);
if(canexist && (ip = dirlookup(dp, name, &off)) != 0){
if((ip = dirlookup(dp, name, &off)) != 0){
iunlockput(dp);
ilock(ip);
if(ip->type != type || ip->major != major || ip->minor != minor){
if(ip->type != type || type != T_FILE){
iunlockput(ip);
return 0;
}
@ -250,17 +250,8 @@ create(char *path, int canexist, short type, short major, short minor)
panic("create dots");
}
if(dirlink(dp, name, ip->inum) < 0){
if(type == T_DIR){
dp->nlink--;
iupdate(dp);
}
iunlockput(dp);
ip->nlink = 0;
iunlockput(ip);
return 0;
}
if(dirlink(dp, name, ip->inum) < 0)
panic("create: dirlink");
iunlockput(dp);
return ip;
@ -278,13 +269,13 @@ sys_open(void)
return -1;
if(omode & O_CREATE){
if((ip = create(path, 1, T_FILE, 0, 0)) == 0)
if((ip = create(path, T_FILE, 0, 0)) == 0)
return -1;
} else {
if((ip = namei(path)) == 0)
return -1;
ilock(ip);
if(ip->type == T_DIR && (omode & (O_RDWR|O_WRONLY))){
if(ip->type == T_DIR && omode != O_RDONLY){
iunlockput(ip);
return -1;
}
@ -318,7 +309,7 @@ sys_mknod(void)
if((len=argstr(0, &path)) < 0 ||
argint(1, &major) < 0 ||
argint(2, &minor) < 0 ||
(ip = create(path, 0, T_DEV, major, minor)) == 0)
(ip = create(path, T_DEV, major, minor)) == 0)
return -1;
iunlockput(ip);
return 0;
@ -330,7 +321,7 @@ sys_mkdir(void)
char *path;
struct inode *ip;
if(argstr(0, &path) < 0 || (ip = create(path, 0, T_DIR, 0, 0)) == 0)
if(argstr(0, &path) < 0 || (ip = create(path, T_DIR, 0, 0)) == 0)
return -1;
iunlockput(ip);
return 0;