remove namelen parameter
This commit is contained in:
rsc
parent
0073beee52
commit
fbf9103952
7
defs.h
7
defs.h
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@ -121,24 +121,19 @@ void bwrite(struct buf*, uint);
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void brelse(struct buf*);
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// fs.c
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struct inode;
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void iinit(void);
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struct inode* iget(uint, uint);
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void ilock(struct inode*);
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void iunlock(struct inode*);
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void itrunc(struct inode*);
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void idecref(struct inode*);
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struct inode* iincref(struct inode*);
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void iput(struct inode*);
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struct inode* namei(char*);
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struct inode* nameiparent(char*, char**, int*);
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void stati(struct inode*, struct stat*);
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int readi(struct inode*, char*, uint, uint);
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int writei(struct inode*, char*, uint, uint);
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struct inode* mknod(char*, short, short, short);
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struct inode* dircreat(struct inode*, char*, int, short, short, short);
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struct inode* dirlookup(struct inode*, char*, int, uint*);
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int unlink(char*);
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void iupdate(struct inode*);
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int link(char*, char*);
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struct inode* igetroot(void);
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int mkdir(char *path);
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146
fs.c
146
fs.c
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@ -24,6 +24,8 @@
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#include "dev.h"
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#define min(a, b) ((a) < (b) ? (a) : (b))
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static void itrunc(struct inode*);
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static void iupdate(struct inode*);
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// Blocks.
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@ -278,7 +280,7 @@ ialloc(uint dev, short type)
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}
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// Copy inode, which has changed, from memory to disk.
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void
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static void
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iupdate(struct inode *ip)
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{
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struct buf *bp;
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@ -347,7 +349,7 @@ bmap(struct inode *ip, uint bn, int alloc)
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}
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// Truncate inode (discard contents).
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void
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static void
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itrunc(struct inode *ip)
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{
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int i, j;
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@ -451,14 +453,41 @@ writei(struct inode *ip, char *src, uint off, uint n)
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//
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// Directories are just inodes (files) filled with dirent structures.
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// Compare two names, which are strings with a max length of DIRSIZ.
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static int
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namecmp(const char *s, const char *t)
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{
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int i;
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for(i=0; i<DIRSIZ; i++){
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if(s[i] != t[i])
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return s[i] - t[i];
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if(s[i] == 0)
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break;
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}
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return 0;
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}
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// Copy one name to another.
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static void
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namecpy(char *s, const char *t)
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{
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int i;
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for(i=0; i<DIRSIZ && t[i]; i++)
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s[i] = t[i];
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for(; i<DIRSIZ; i++)
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s[i] = 0;
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}
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// Look for a directory entry in a directory.
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// If not found, return -1.
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// If found:
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// set *poff to the byte offset of the directory entry
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// set *pinum to the inode number
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// return 0.
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struct inode*
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dirlookup(struct inode *dp, char *name, int namelen, uint *poff)
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static struct inode*
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dirlookup(struct inode *dp, char *name, uint *poff)
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{
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uint off, inum;
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struct buf *bp;
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@ -474,8 +503,7 @@ dirlookup(struct inode *dp, char *name, int namelen, uint *poff)
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de++){
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if(de->inum == 0)
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continue;
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if(memcmp(name, de->name, namelen) == 0 &&
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(namelen == DIRSIZ || de->name[namelen]== 0)){
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if(namecmp(name, de->name) == 0){
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// entry matches path element
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if(poff)
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*poff = off + (uchar*)de - bp->data;
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@ -491,15 +519,15 @@ dirlookup(struct inode *dp, char *name, int namelen, uint *poff)
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// Write a new directory entry (name, ino) into the directory dp.
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// Caller must have locked dp.
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int
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dirlink(struct inode *dp, char *name, int namelen, uint ino)
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static int
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dirlink(struct inode *dp, char *name, uint ino)
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{
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int off;
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struct dirent de;
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struct inode *ip;
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// Double-check that name is not present.
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if((ip = dirlookup(dp, name, namelen, 0)) != 0){
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if((ip = dirlookup(dp, name, 0)) != 0){
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idecref(ip);
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return -1;
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}
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@ -512,11 +540,8 @@ dirlink(struct inode *dp, char *name, int namelen, uint ino)
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break;
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}
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namecpy(de.name, name);
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de.inum = ino;
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if(namelen > DIRSIZ)
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namelen = DIRSIZ;
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memmove(de.name, name, namelen);
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memset(de.name+namelen, 0, DIRSIZ-namelen);
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if(writei(dp, (char*)&de, off, sizeof(de)) != sizeof(de))
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panic("dirwrite");
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@ -526,8 +551,8 @@ dirlink(struct inode *dp, char *name, int namelen, uint ino)
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// Create a new inode named name inside dp
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// and return its locked inode structure.
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// If name already exists, return 0.
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struct inode*
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dircreat(struct inode *dp, char *name, int namelen, short type, short major, short minor)
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static struct inode*
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dircreat(struct inode *dp, char *name, short type, short major, short minor)
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{
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struct inode *ip;
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@ -541,7 +566,7 @@ dircreat(struct inode *dp, char *name, int namelen, short type, short major, sho
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ip->nlink = 1;
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iupdate(ip);
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if(dirlink(dp, name, namelen, ip->inum) < 0){
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if(dirlink(dp, name, ip->inum) < 0){
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ip->nlink = 0;
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iupdate(ip);
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iput(ip);
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@ -568,16 +593,25 @@ dircreat(struct inode *dp, char *name, int namelen, short type, short major, sho
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// skipelem("") = skipelem("////") = 0
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//
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static char*
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skipelem(char *path, char **name, int *len)
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skipelem(char *path, char *name)
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{
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char *s;
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int len;
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while(*path == '/')
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path++;
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if(*path == 0)
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return 0;
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*name = path;
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s = path;
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while(*path != '/' && *path != 0)
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path++;
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*len = path - *name;
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len = path - s;
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if(len >= DIRSIZ)
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memmove(name, s, DIRSIZ);
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else{
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memmove(name, s, len);
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name[len] = 0;
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}
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while(*path == '/')
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path++;
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return path;
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@ -593,11 +627,9 @@ skipelem(char *path, char **name, int *len)
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// NAMEI_DELETE: return locked parent inode, offset of dirent in *ret_off.
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// return 0 if name doesn't exist.
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struct inode*
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_namei(char *path, int parent, char **pname, int *pnamelen)
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_namei(char *path, int parent, char *name)
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{
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struct inode *dp, *ip;
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char *name;
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int namelen;
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uint off;
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if(*path == '/')
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@ -606,22 +638,16 @@ _namei(char *path, int parent, char **pname, int *pnamelen)
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dp = iincref(cp->cwd);
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ilock(dp);
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while((path = skipelem(path, &name, &namelen)) != 0){
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// Truncate names in path to DIRSIZ chars.
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if(namelen > DIRSIZ)
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namelen = DIRSIZ;
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while((path = skipelem(path, name)) != 0){
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if(dp->type != T_DIR)
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goto fail;
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if(parent && *path == '\0'){
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// Stop one level early.
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*pname = name;
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*pnamelen = namelen;
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return dp;
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}
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if((ip = dirlookup(dp, name, namelen, &off)) == 0)
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if((ip = dirlookup(dp, name, &off)) == 0)
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goto fail;
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iput(dp);
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@ -642,29 +668,27 @@ fail:
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struct inode*
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namei(char *path)
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{
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return _namei(path, 0, 0, 0);
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char name[DIRSIZ];
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return _namei(path, 0, name);
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}
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struct inode*
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nameiparent(char *path, char **name, int *namelen)
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static struct inode*
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nameiparent(char *path, char *name)
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{
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return _namei(path, 1, name, namelen);
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return _namei(path, 1, name);
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}
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// Create the path and return its locked inode structure.
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// If cp already exists, return 0.
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struct inode*
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mknod(char *path, short type, short major, short minor)
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{
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struct inode *ip, *dp;
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char *name;
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int namelen;
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char name[DIRSIZ];
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if((dp = nameiparent(path, &name, &namelen)) == 0)
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if((dp = nameiparent(path, name)) == 0)
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return 0;
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ip = dircreat(dp, name, namelen, type, major, minor);
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ip = dircreat(dp, name, type, major, minor);
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iput(dp);
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return ip;
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}
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@ -676,26 +700,21 @@ unlink(char *path)
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struct inode *ip, *dp;
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struct dirent de;
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uint off;
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char *name;
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int namelen;
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char name[DIRSIZ];
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if((dp = nameiparent(path, &name, &namelen)) == 0)
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if((dp = nameiparent(path, name)) == 0)
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return -1;
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if((ip = dirlookup(dp, name, namelen, &off)) == 0){
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// Cannot unlink "." or "..".
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if(namecmp(name, ".") == 0 || namecmp(name, "..") == 0){
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iput(dp);
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return -1;
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}
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if(readi(dp, (char*)&de, off, sizeof(de)) != sizeof(de) || de.inum == 0)
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panic("unlink no entry");
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// Cannot remove "." or ".." - the 2 and 3 count the trailing NUL.
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if(memcmp(de.name, ".", 2) == 0 || memcmp(de.name, "..", 3) == 0){
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idecref(ip);
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if((ip = dirlookup(dp, name, &off)) == 0){
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iput(dp);
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return -1;
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}
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memset(&de, 0, sizeof(de));
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if(writei(dp, (char*)&de, off, sizeof(de)) != sizeof(de))
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panic("unlink dir write");
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@ -716,8 +735,7 @@ int
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link(char *old, char *new)
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{
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struct inode *ip, *dp;
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char *name;
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int namelen;
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char name[DIRSIZ];
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if((ip = namei(old)) == 0)
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return -1;
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@ -727,11 +745,11 @@ link(char *old, char *new)
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}
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iunlock(ip);
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if((dp = nameiparent(new, &name, &namelen)) == 0){
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if((dp = nameiparent(new, name)) == 0){
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idecref(ip);
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return -1;
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}
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if(dp->dev != ip->dev || dirlink(dp, name, namelen, ip->inum) < 0){
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if(dp->dev != ip->dev || dirlink(dp, name, ip->inum) < 0){
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idecref(ip);
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iput(dp);
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return -1;
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@ -750,21 +768,20 @@ int
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mkdir(char *path)
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{
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struct inode *dp, *ip;
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char *name;
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int namelen;
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char name[DIRSIZ];
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// XXX write ordering is screwy here- do we care?
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if((dp = nameiparent(path, &name, &namelen)) == 0)
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if((dp = nameiparent(path, name)) == 0)
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return -1;
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if((ip = dircreat(dp, name, namelen, T_DIR, 0, 0)) == 0){
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if((ip = dircreat(dp, name, T_DIR, 0, 0)) == 0){
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iput(dp);
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return -1;
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}
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dp->nlink++;
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iupdate(dp);
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if(dirlink(ip, ".", 1, ip->inum) < 0 || dirlink(ip, "..", 2, dp->inum) < 0)
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if(dirlink(ip, ".", ip->inum) < 0 || dirlink(ip, "..", dp->inum) < 0)
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panic("mkdir");
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iput(dp);
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iput(ip);
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@ -776,13 +793,12 @@ struct inode*
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create(char *path)
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{
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struct inode *dp, *ip;
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char *name;
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int namelen;
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char name[DIRSIZ];
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if((dp = nameiparent(path, &name, &namelen)) == 0)
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if((dp = nameiparent(path, name)) == 0)
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return 0;
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if((ip = dirlookup(dp, name, namelen, 0)) != 0){
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if((ip = dirlookup(dp, name, 0)) != 0){
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iput(dp);
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ilock(ip);
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if(ip->type == T_DIR){
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@ -791,7 +807,7 @@ create(char *path)
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}
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return ip;
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}
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if((ip = dircreat(dp, name, namelen, T_FILE, 0, 0)) == 0){
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if((ip = dircreat(dp, name, T_FILE, 0, 0)) == 0){
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iput(dp);
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return 0;
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}
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