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-rw-r--r--defs.h18
-rw-r--r--exec.c10
-rw-r--r--file.c22
-rw-r--r--file.h2
-rw-r--r--fs.c94
-rw-r--r--fsvar.h6
-rw-r--r--init.c2
-rw-r--r--proc.h2
-rw-r--r--sysfile.c113
-rw-r--r--user.h2
10 files changed, 130 insertions, 141 deletions
diff --git a/defs.h b/defs.h
index ba70cbb..cbe0dd4 100644
--- a/defs.h
+++ b/defs.h
@@ -6,7 +6,6 @@ struct pipe;
struct proc;
struct spinlock;
struct stat;
-struct uinode;
// 8253pit.c
void pit8253_timerinit(void);
@@ -37,17 +36,18 @@ int filewrite(struct file*, char*, int n);
// fs.c
int dirlink(struct inode*, char*, uint);
-struct uinode* dirlookup(struct inode*, char*, uint*);
-struct uinode* ialloc(uint, short);
-struct uinode* idup(struct uinode*);
+struct inode* dirlookup(struct inode*, char*, uint*);
+struct inode* ialloc(uint, short);
+struct inode* idup(struct inode*);
void iinit(void);
-struct inode* ilock(struct uinode*);
-struct uinode* iunlock(struct inode*);
-void iput(struct uinode*);
+void ilock(struct inode*);
+void iput(struct inode*);
+void iunlock(struct inode*);
+void iunlockput(struct inode*);
void iupdate(struct inode*);
int namecmp(const char*, const char*);
-struct uinode* namei(char*);
-struct uinode* nameiparent(char*, char*);
+struct inode* namei(char*);
+struct inode* nameiparent(char*, char*);
int readi(struct inode*, char*, uint, uint);
void stati(struct inode*, struct stat*);
int writei(struct inode*, char*, uint, uint);
diff --git a/exec.c b/exec.c
index de1175c..4da73b2 100644
--- a/exec.c
+++ b/exec.c
@@ -29,8 +29,9 @@ exec(char *path, char **argv)
sz = 0;
mem = 0;
- if((ip = ilock(namei(path))) == 0)
+ if((ip = namei(path)) == 0)
return -1;
+ ilock(ip);
if(readi(ip, (char*)&elf, 0, sizeof(elf)) < sizeof(elf))
goto bad;
@@ -112,8 +113,7 @@ exec(char *path, char **argv)
goto bad2;
memset(cp->mem + ph.va + ph.filesz, 0, ph.memsz - ph.filesz);
}
-
- iput(iunlock(ip));
+ iunlockput(ip);
cp->tf->eip = elf.entry;
cp->tf->esp = sp;
@@ -124,11 +124,11 @@ exec(char *path, char **argv)
bad:
if(mem)
kfree(mem, sz);
- iput(iunlock(ip));
+ iunlockput(ip);
return -1;
bad2:
- iput(iunlock(ip));
+ iunlockput(ip);
proc_exit();
return 0;
}
diff --git a/file.c b/file.c
index 981d474..297fd1c 100644
--- a/file.c
+++ b/file.c
@@ -56,17 +56,16 @@ int
fileread(struct file *f, char *addr, int n)
{
int r;
- struct inode *ip;
if(f->readable == 0)
return -1;
if(f->type == FD_PIPE)
return pipe_read(f->pipe, addr, n);
if(f->type == FD_INODE){
- ip = ilock(f->ip);
- if((r = readi(ip, addr, f->off, n)) > 0)
+ ilock(f->ip);
+ if((r = readi(f->ip, addr, f->off, n)) > 0)
f->off += r;
- iunlock(ip);
+ iunlock(f->ip);
return r;
}
panic("fileread");
@@ -77,17 +76,16 @@ int
filewrite(struct file *f, char *addr, int n)
{
int r;
- struct inode *ip;
if(f->writable == 0)
return -1;
if(f->type == FD_PIPE)
return pipe_write(f->pipe, addr, n);
if(f->type == FD_INODE){
- ip = ilock(f->ip);
- if((r = writei(ip, addr, f->off, n)) > 0)
+ ilock(f->ip);
+ if((r = writei(f->ip, addr, f->off, n)) > 0)
f->off += r;
- iunlock(ip);
+ iunlock(f->ip);
return r;
}
panic("filewrite");
@@ -97,12 +95,10 @@ filewrite(struct file *f, char *addr, int n)
int
filestat(struct file *f, struct stat *st)
{
- struct inode *ip;
-
if(f->type == FD_INODE){
- ip = ilock(f->ip);
- stati(ip, st);
- iunlock(ip);
+ ilock(f->ip);
+ stati(f->ip, st);
+ iunlock(f->ip);
return 0;
}
return -1;
diff --git a/file.h b/file.h
index d864793..99f0122 100644
--- a/file.h
+++ b/file.h
@@ -4,6 +4,6 @@ struct file {
char readable;
char writable;
struct pipe *pipe;
- struct uinode *ip;
+ struct inode *ip;
uint off;
};
diff --git a/fs.c b/fs.c
index 58893b1..bc3cccd 100644
--- a/fs.c
+++ b/fs.c
@@ -129,7 +129,7 @@ iinit(void)
// Find the inode with number inum on device dev
// and return the in-memory copy. h
-static struct uinode*
+static struct inode*
iget(uint dev, uint inum)
{
struct inode *ip, *empty;
@@ -142,7 +142,7 @@ iget(uint dev, uint inum)
if(ip->ref > 0 && ip->dev == dev && ip->inum == inum){
ip->ref++;
release(&icache.lock);
- return (struct uinode*)ip;
+ return ip;
}
if(empty == 0 && ip->ref == 0) // Remember empty slot.
empty = ip;
@@ -159,37 +159,29 @@ iget(uint dev, uint inum)
ip->flags = 0;
release(&icache.lock);
- return (struct uinode*)ip;
+ return ip;
}
// Increment reference count for ip.
// Returns ip to enable ip = idup(ip1) idiom.
-struct uinode*
-idup(struct uinode *uip)
+struct inode*
+idup(struct inode *ip)
{
- struct inode *ip;
-
- ip = (struct inode*)uip;
acquire(&icache.lock);
ip->ref++;
release(&icache.lock);
- return uip;
+ return ip;
}
// Lock the given inode.
-struct inode*
-ilock(struct uinode *uip)
+void
+ilock(struct inode *ip)
{
struct buf *bp;
struct dinode *dip;
- struct inode *ip;
-
- ip = (struct inode*)uip;
- if(ip == 0)
- return 0;
- if(ip->ref < 1)
- panic("ilock: no refs");
+ if(ip == 0 || ip->ref < 1)
+ panic("ilock");
acquire(&icache.lock);
while(ip->flags & I_BUSY)
@@ -211,33 +203,25 @@ ilock(struct uinode *uip)
if(ip->type == 0)
panic("ilock: no type");
}
- return ip;
}
// Unlock the given inode.
-struct uinode*
+void
iunlock(struct inode *ip)
{
- if(ip == 0)
- return 0;
-
- if(!(ip->flags & I_BUSY) || ip->ref < 1)
+ if(ip == 0 || !(ip->flags & I_BUSY) || ip->ref < 1)
panic("iunlock");
acquire(&icache.lock);
ip->flags &= ~I_BUSY;
wakeup(ip);
release(&icache.lock);
- return (struct uinode*)ip;
}
// Caller holds reference to unlocked ip. Drop reference.
void
-iput(struct uinode *uip)
+iput(struct inode *ip)
{
- struct inode *ip;
-
- ip = (struct inode*)uip;
acquire(&icache.lock);
if(ip->ref == 1 && (ip->flags & I_VALID) && ip->nlink == 0) {
// inode is no longer used: truncate and free inode.
@@ -256,8 +240,15 @@ iput(struct uinode *uip)
release(&icache.lock);
}
+void
+iunlockput(struct inode *ip)
+{
+ iunlock(ip);
+ iput(ip);
+}
+
// Allocate a new inode with the given type on device dev.
-struct uinode*
+struct inode*
ialloc(uint dev, short type)
{
int inum, ninodes;
@@ -478,7 +469,7 @@ namecmp(const char *s, const char *t)
// Look for a directory entry in a directory.
// If found, set *poff to byte offset of entry.
// Caller must have already locked dp.
-struct uinode*
+struct inode*
dirlookup(struct inode *dp, char *name, uint *poff)
{
uint off, inum;
@@ -527,11 +518,11 @@ dirlink(struct inode *dp, char *name, uint ino)
{
int off;
struct dirent de;
- struct uinode *ipu;
+ struct inode *ip;
// Check that name is not present.
- if((ipu = dirlookup(dp, name, 0)) != 0){
- iput(ipu);
+ if((ip = dirlookup(dp, name, 0)) != 0){
+ iput(ip);
return -1;
}
@@ -593,53 +584,52 @@ skipelem(char *path, char *name)
// If parent is set, return the inode for the parent
// and write the final path element to name, which
// should have room for DIRSIZ bytes.
-static struct uinode*
+static struct inode*
_namei(char *path, int parent, char *name)
{
- struct uinode *dpu, *ipu;
- struct inode *dp;
+ struct inode *ip, *next;
uint off;
if(*path == '/')
- dpu = iget(ROOTDEV, 1);
+ ip = iget(ROOTDEV, 1);
else
- dpu = idup(cp->cwd);
+ ip = idup(cp->cwd);
while((path = skipelem(path, name)) != 0){
- dp = ilock(dpu);
- if(dp->type != T_DIR){
- iput(iunlock(dp));
+ ilock(ip);
+ if(ip->type != T_DIR){
+ iunlockput(ip);
return 0;
}
if(parent && *path == '\0'){
// Stop one level early.
- iunlock(dp);
- return dpu;
+ iunlock(ip);
+ return ip;
}
- if((ipu = dirlookup(dp, name, &off)) == 0){
- iput(iunlock(dp));
+ if((next = dirlookup(ip, name, &off)) == 0){
+ iunlockput(ip);
return 0;
}
- iput(iunlock(dp));
- dpu = ipu;
+ iunlockput(ip);
+ ip = next;
}
if(parent){
- iput(dpu);
+ iput(ip);
return 0;
}
- return dpu;
+ return ip;
}
-struct uinode*
+struct inode*
namei(char *path)
{
char name[DIRSIZ];
return _namei(path, 0, name);
}
-struct uinode*
+struct inode*
nameiparent(char *path, char *name)
{
return _namei(path, 1, name);
diff --git a/fsvar.h b/fsvar.h
index 07dbf53..17bcb5b 100644
--- a/fsvar.h
+++ b/fsvar.h
@@ -14,11 +14,5 @@ struct inode {
uint addrs[NADDRS];
};
-// unlocked inode - only dev and inum are available
-struct uinode {
- uint dev;
- uint inum;
-};
-
#define I_BUSY 0x1
#define I_VALID 0x2
diff --git a/init.c b/init.c
index f8ad7b6..e873f3b 100644
--- a/init.c
+++ b/init.c
@@ -14,7 +14,7 @@ main(void)
int pid, wpid;
if(open("console", O_RDWR) < 0){
- mknod("console", T_DEV, 1, 1);
+ mknod("console", 1, 1);
open("console", O_RDWR);
}
dup(0); // stdout
diff --git a/proc.h b/proc.h
index 599ed44..84dc57d 100644
--- a/proc.h
+++ b/proc.h
@@ -37,7 +37,7 @@ struct proc {
void *chan; // If non-zero, sleeping on chan
int killed; // If non-zero, have been killed
struct file *ofile[NOFILE]; // Open files
- struct uinode *cwd; // Current directory
+ struct inode *cwd; // Current directory
struct jmpbuf jmpbuf; // Jump here to run process
struct trapframe *tf; // Trap frame for current interrupt
char name[16]; // Process name (debugging)
diff --git a/sysfile.c b/sysfile.c
index 625d466..afef304 100644
--- a/sysfile.c
+++ b/sysfile.c
@@ -103,33 +103,37 @@ sys_link(void)
{
char name[DIRSIZ], *new, *old;
struct inode *dp, *ip;
- struct uinode *ipu;
if(argstr(0, &old) < 0 || argstr(1, &new) < 0)
return -1;
- if((ip = ilock(namei(old))) == 0)
+ if((ip = namei(old)) == 0)
return -1;
+ ilock(ip);
if(ip->type == T_DIR){
- iput(iunlock(ip));
+ iunlockput(ip);
return -1;
}
ip->nlink++;
iupdate(ip);
- ipu = iunlock(ip); ip = 0;
-
- if((dp = ilock(nameiparent(new, name))) == 0 ||
- dp->dev != ipu->dev || dirlink(dp, name, ipu->inum) < 0){
- if(dp)
- iput(iunlock(dp));
- ip = ilock(ipu);
- ip->nlink--;
- iupdate(ip);
- iput(iunlock(ip));
- return -1;
- }
- iput(iunlock(dp));
- iput(ipu);
+ 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;
+ iunlockput(dp);
+ iput(ip);
return 0;
+
+bad:
+ if(dp)
+ iunlockput(dp);
+ ilock(ip);
+ ip->nlink--;
+ iupdate(ip);
+ iunlockput(ip);
+ return -1;
}
// Is the directory dp empty except for "." and ".." ?
@@ -158,65 +162,67 @@ sys_unlink(void)
if(argstr(0, &path) < 0)
return -1;
- if((dp = ilock(nameiparent(path, name))) == 0)
+ if((dp = nameiparent(path, name)) == 0)
return -1;
+ ilock(dp);
// Cannot unlink "." or "..".
if(namecmp(name, ".") == 0 || namecmp(name, "..") == 0){
- iput(iunlock(dp));
+ iunlockput(dp);
return -1;
}
- if((ip = ilock(dirlookup(dp, name, &off))) == 0){
- iput(iunlock(dp));
+ if((ip = dirlookup(dp, name, &off)) == 0){
+ iunlockput(dp);
return -1;
}
+ ilock(ip);
if(ip->nlink < 1)
panic("unlink: nlink < 1");
if(ip->type == T_DIR && !isdirempty(ip)){
- iput(iunlock(ip));
- iput(iunlock(dp));
+ iunlockput(ip);
+ iunlockput(dp);
return -1;
}
memset(&de, 0, sizeof(de));
if(writei(dp, (char*)&de, off, sizeof(de)) != sizeof(de))
panic("unlink: writei");
- iput(iunlock(dp));
-
+ iunlockput(dp);
+
ip->nlink--;
iupdate(ip);
- iput(iunlock(ip));
+ iunlockput(ip);
return 0;
}
-// Create the path and return its unlocked inode structure.
static struct inode*
mkpath(char *path, int canexist, short type, short major, short minor)
{
uint off;
struct inode *ip, *dp;
- struct uinode *ipu;
char name[DIRSIZ];
- if((dp = ilock(nameiparent(path, name))) == 0)
+ if((dp = nameiparent(path, name)) == 0)
return 0;
+ ilock(dp);
- if(canexist && (ipu = dirlookup(dp, name, &off)) != 0){
- iput(iunlock(dp));
- ip = ilock(ipu);
+ if(canexist && (ip = dirlookup(dp, name, &off)) != 0){
+ iunlockput(dp);
+ ilock(ip);
if(ip->type != type || ip->major != major || ip->minor != minor){
- iput(iunlock(ip));
+ iunlockput(ip);
return 0;
}
return ip;
}
- if((ip = ilock(ialloc(dp->dev, type))) == 0){
- iput(iunlock(dp));
+ if((ip = ialloc(dp->dev, type)) == 0){
+ iunlockput(dp);
return 0;
}
+ ilock(ip);
ip->major = major;
ip->minor = minor;
ip->size = 0;
@@ -225,8 +231,8 @@ mkpath(char *path, int canexist, short type, short major, short minor)
if(dirlink(dp, name, ip->inum) < 0){
ip->nlink = 0;
- iput(iunlock(ip));
- iput(iunlock(dp));
+ iunlockput(ip);
+ iunlockput(dp);
return 0;
}
@@ -237,7 +243,7 @@ mkpath(char *path, int canexist, short type, short major, short minor)
if(dirlink(ip, ".", ip->inum) < 0 || dirlink(ip, "..", dp->inum) < 0)
panic("mkpath dots");
}
- iput(iunlock(dp));
+ iunlockput(dp);
return ip;
}
@@ -256,10 +262,11 @@ sys_open(void)
if((ip = mkpath(path, 1, T_FILE, 0, 0)) == 0)
return -1;
}else{
- if((ip = ilock(namei(path))) == 0)
+ if((ip = namei(path)) == 0)
return -1;
+ ilock(ip);
if(ip->type == T_DIR && (omode & (O_RDWR|O_WRONLY))){
- iput(iunlock(ip));
+ iunlockput(ip);
return -1;
}
}
@@ -267,12 +274,13 @@ sys_open(void)
if((f = filealloc()) == 0 || (fd = fdalloc(f)) < 0){
if(f)
fileclose(f);
- iput(iunlock(ip));
+ iunlockput(ip);
return -1;
}
+ iunlock(ip);
f->type = FD_INODE;
- f->ip = iunlock(ip);
+ f->ip = ip;
f->off = 0;
if(omode & O_RDWR) {
f->readable = 1;
@@ -296,13 +304,12 @@ sys_mknod(void)
int len;
int type, major, minor;
- if((len=argstr(0, &path)) < 0 || argint(1, &type) < 0 ||
- argint(2, &major) < 0 || argint(3, &minor) < 0)
- return -1;
- // XXX check that type == T_DEV or eliminate type arg?
- if((ip = mkpath(path, 0, type, major, minor)) == 0)
+ if((len=argstr(0, &path)) < 0 ||
+ argint(1, &major) < 0 ||
+ argint(2, &minor) < 0 ||
+ (ip = mkpath(path, 0, T_DEV, major, minor)) == 0)
return -1;
- iput(iunlock(ip));
+ iunlockput(ip);
return 0;
}
@@ -314,7 +321,7 @@ sys_mkdir(void)
if(argstr(0, &path) < 0 || (ip = mkpath(path, 0, T_DIR, 0, 0)) == 0)
return -1;
- iput(iunlock(ip));
+ iunlockput(ip);
return 0;
}
@@ -324,14 +331,16 @@ sys_chdir(void)
char *path;
struct inode *ip;
- if(argstr(0, &path) < 0 || (ip = ilock(namei(path))) == 0)
+ if(argstr(0, &path) < 0 || (ip = namei(path)) == 0)
return -1;
+ ilock(ip);
if(ip->type != T_DIR) {
- iput(iunlock(ip));
+ iunlockput(ip);
return -1;
}
+ iunlock(ip);
iput(cp->cwd);
- cp->cwd = iunlock(ip);
+ cp->cwd = ip;
return 0;
}
diff --git a/user.h b/user.h
index bd6f729..1bbe2fd 100644
--- a/user.h
+++ b/user.h
@@ -9,7 +9,7 @@ int close(int);
int kill(int);
int exec(char*, char**);
int open(char*, int);
-int mknod(char*, short, short, short);
+int mknod(char*, short, short);
int unlink(char*);
int fstat(int fd, struct stat*);
int link(char*, char*);
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