inode addrs[NDIRECT] -> NADDRS
fix race in mknod / creat use last component in dirent in mknod, not path
This commit is contained in:
rtm
parent
74493bf446
commit
5051da6de3
7 changed files with 208 additions and 31 deletions
5
Notes
5
Notes
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@ -120,6 +120,11 @@ test: dup() shared fd->off
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test: indirect blocks. files and directories.
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test: sbrk
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test: does echo foo > x truncate x?
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test: does create/mkdir/link extract last component correctly?
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does namei insist that all the intermediate directories exist?
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test: creat/link/mkdir w/ / in name
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test: try to create dir ents when intermediate dir doesn't exist
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or is a file, not a dir
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make proc[0] runnable
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cpu early tss and gdt
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3
defs.h
3
defs.h
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@ -119,11 +119,12 @@ void iunlock(struct inode *ip);
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void idecref(struct inode *ip);
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void iincref(struct inode *ip);
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void iput(struct inode *ip);
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struct inode * namei(char *path, int, uint *);
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struct inode * namei(char *path, int, uint *, char **, struct inode **);
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void stati(struct inode *ip, struct stat *st);
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int readi(struct inode *ip, char *xdst, uint off, uint n);
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int writei(struct inode *ip, char *addr, uint off, uint n);
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struct inode *mknod(char *, short, short, short);
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struct inode * mknod1(struct inode *, char *, short, short, short);
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int unlink(char *cp);
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void iupdate (struct inode *ip);
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int link(char *file1, char *file2);
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71
fs.c
71
fs.c
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@ -241,12 +241,14 @@ bmap(struct inode *ip, uint bn)
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if (x == 0)
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panic("bmap 2");
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} else {
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if(ip->addrs[INDIRECT] == 0)
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panic("bmap 3");
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inbp = bread(ip->dev, ip->addrs[INDIRECT]);
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a = (uint *) inbp->data;
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x = a[bn - NDIRECT];
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brelse(inbp);
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if (x == 0)
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panic("bmap 3");
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panic("bmap 4");
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}
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return x;
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}
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@ -431,11 +433,14 @@ writei(struct inode *ip, char *addr, uint off, uint n)
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// look up a path name, in one of three modes.
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// NAMEI_LOOKUP: return locked target inode.
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// NAMEI_CREATE: return locked parent inode.
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// but return 0 if name does exist.
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// return 0 if name does exist.
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// *ret_last points to last path component (i.e. new file name).
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// *ret_ip points to the the name that did exist, if it did.
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// *ret_ip and *ret_last may be zero even if return value is zero.
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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 mode, uint *ret_off)
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namei(char *path, int mode, uint *ret_off, char **ret_last, struct inode **ret_ip)
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{
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struct inode *dp;
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struct proc *p = curproc[cpu()];
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@ -446,6 +451,17 @@ namei(char *path, int mode, uint *ret_off)
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int i, atend;
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unsigned ninum;
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if(mode == NAMEI_DELETE && ret_off == 0)
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panic("namei no ret_off");
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if(mode == NAMEI_CREATE && ret_last == 0)
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panic("namei no ret_last");
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if(ret_off)
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*ret_off = 0xffffffff;
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if(ret_last)
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*ret_last = 0;
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if(ret_ip)
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*ret_ip = 0;
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if (*cp == '/') dp = iget(rootdev, 1);
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else {
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dp = p->cwd;
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@ -460,6 +476,10 @@ namei(char *path, int mode, uint *ret_off)
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if(*cp == '\0'){
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if(mode == NAMEI_LOOKUP)
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return dp;
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if(mode == NAMEI_CREATE && ret_ip){
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*ret_ip = dp;
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return 0;
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}
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iput(dp);
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return 0;
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}
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@ -493,8 +513,14 @@ namei(char *path, int mode, uint *ret_off)
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for(cp1 = cp; *cp1; cp1++)
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if(*cp1 == '/')
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atend = 0;
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if(mode == NAMEI_CREATE && atend)
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if(mode == NAMEI_CREATE && atend){
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if(*cp == '\0'){
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iput(dp);
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return 0;
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}
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*ret_last = cp;
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return dp;
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}
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iput(dp);
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return 0;
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@ -521,6 +547,9 @@ wdir(struct inode *dp, char *name, uint ino)
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struct dirent de;
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int i;
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if(name[0] == '\0')
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panic("wdir no name");
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for(off = 0; off < dp->size; off += sizeof(de)){
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if(readi(dp, (char *) &de, off, sizeof(de)) != sizeof(de))
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panic("wdir read");
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@ -529,8 +558,11 @@ wdir(struct inode *dp, char *name, uint ino)
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}
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de.inum = ino;
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for(i = 0; i < DIRSIZ && name[i]; i++)
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for(i = 0; i < DIRSIZ && name[i]; i++){
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if(name[i] == '/')
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panic("wdir /");
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de.name[i] = name[i];
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}
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for( ; i < DIRSIZ; i++)
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de.name[i] = '\0';
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@ -542,10 +574,23 @@ struct inode *
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mknod(char *cp, short type, short major, short minor)
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{
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struct inode *ip, *dp;
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char *last;
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if ((dp = namei(cp, NAMEI_CREATE, 0)) == 0)
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if ((dp = namei(cp, NAMEI_CREATE, 0, &last, 0)) == 0)
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return 0;
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ip = mknod1(dp, last, type, major, minor);
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iput(dp);
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return ip;
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}
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struct inode *
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mknod1(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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ip = ialloc(dp->dev, type);
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if (ip == 0) {
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iput(dp);
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@ -558,8 +603,8 @@ mknod(char *cp, short type, short major, short minor)
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iupdate (ip); // write new inode to disk
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wdir(dp, cp, ip->inum);
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iput(dp);
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wdir(dp, name, ip->inum);
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return ip;
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}
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@ -570,7 +615,8 @@ unlink(char *cp)
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struct dirent de;
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uint off, inum, dev;
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if ((dp = namei(cp, NAMEI_DELETE, &off)) == 0)
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dp = namei(cp, NAMEI_DELETE, &off, 0, 0);
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if(dp == 0)
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return -1;
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dev = dp->dev;
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@ -604,8 +650,9 @@ int
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link(char *name1, char *name2)
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{
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struct inode *ip, *dp;
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char *last;
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if ((ip = namei(name1, NAMEI_LOOKUP, 0)) == 0)
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if ((ip = namei(name1, NAMEI_LOOKUP, 0, 0, 0)) == 0)
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return -1;
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if(ip->type == T_DIR){
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iput(ip);
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@ -614,7 +661,7 @@ link(char *name1, char *name2)
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iunlock(ip);
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if ((dp = namei(name2, NAMEI_CREATE, 0)) == 0) {
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if ((dp = namei(name2, NAMEI_CREATE, 0, &last, 0)) == 0) {
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idecref(ip);
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return -1;
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}
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@ -628,7 +675,7 @@ link(char *name1, char *name2)
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ip->nlink += 1;
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iupdate (ip);
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wdir(dp, name2, ip->inum);
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wdir(dp, last, ip->inum);
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iput(dp);
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iput(ip);
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2
fs.h
2
fs.h
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@ -9,7 +9,7 @@ struct superblock{
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uint ninodes;
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};
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#define NADDRS NDIRECT+1
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#define NADDRS (NDIRECT+1)
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#define NDIRECT 12
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#define INDIRECT 12
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#define NINDIRECT (BSIZE / sizeof(uint))
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122
fstests.c
122
fstests.c
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@ -213,7 +213,7 @@ unlinkread()
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exit();
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}
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fd1 = open("xxx", O_CREATE | O_RDWR);
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fd1 = open("unlinkread", O_CREATE | O_RDWR);
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write(fd1, "yyy", 3);
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close(fd1);
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@ -230,7 +230,7 @@ unlinkread()
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exit();
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}
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close(fd);
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unlink("xxx");
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unlink("unlinkread");
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puts("unlinkread ok\n");
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}
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@ -319,7 +319,7 @@ concreate()
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} else {
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fd = open(file, O_CREATE | O_RDWR);
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if(fd < 0){
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puts("concreate create failed\n");
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printf(1, "concreate create %s failed\n", file);
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exit();
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}
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close(fd);
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@ -409,12 +409,126 @@ bigdir()
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puts("bigdir ok\n");
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}
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void
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subdir()
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{
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int fd;
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if(mkdir("dd") != 0){
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puts("subdir mkdir dd failed\n");
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exit();
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}
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fd = open("dd/ff", O_CREATE | O_RDWR);
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if(fd < 0){
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puts("create dd/ff failed\n");
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exit();
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}
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write(fd, "ff", 2);
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close(fd);
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if(mkdir("/dd/dd") != 0){
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puts("subdir mkdir dd/dd failed\n");
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exit();
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}
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fd = open("dd/dd/ff", O_CREATE | O_RDWR);
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if(fd < 0){
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puts("create dd/dd/ff failed\n");
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exit();
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}
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write(fd, "FF", 2);
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close(fd);
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if(link("dd/dd/ff", "dd/dd/ffff") != 0){
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puts("link dd/dd/ff dd/dd/ffff failed\n");
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exit();
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}
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if(unlink("dd/dd/ff") != 0){
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puts("unlink dd/dd/ff failed\n");
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exit();
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}
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fd = open("dd/dd/ffff", 0);
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if(fd < 0){
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puts("open dd/dd/ffff failed\n");
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exit();
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}
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if(read(fd, buf, sizeof(buf)) != 2){
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puts("read dd/dd/ffff wrong len\n");
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exit();
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}
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close(fd);
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if(open("dd/dd/ff", 0) >= 0){
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puts("open dd/dd/ff succeeded!\n");
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exit();
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}
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if(open("dd/ff/ff", O_CREATE|O_RDWR) >= 0){
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puts("create dd/ff/ff succeeded!\n");
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exit();
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}
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if(open("dd/xx/ff", O_CREATE|O_RDWR) >= 0){
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puts("create dd/xx/ff succeeded!\n");
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exit();
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}
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if(link("dd/ff/ff", "dd/dd/xx") == 0){
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puts("link dd/ff/ff dd/dd/xx succeeded!\n");
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exit();
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}
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if(link("dd/xx/ff", "dd/dd/xx") == 0){
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puts("link dd/xx/ff dd/dd/xx succeeded!\n");
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exit();
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}
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if(link("dd/ff", "dd/dd/ff") == 0){
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puts("link dd/ff dd/dd/ff succeeded!\n");
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exit();
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}
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if(mkdir("dd/ff/ff") == 0){
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puts("mkdir dd/ff/ff succeeded!\n");
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exit();
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}
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if(mkdir("dd/xx/ff") == 0){
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puts("mkdir dd/xx/ff succeeded!\n");
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exit();
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}
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if(mkdir("dd/dd/ff") == 0){
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puts("mkdir dd/dd/ff succeeded!\n");
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exit();
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}
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if(unlink("dd/xx/ff") == 0){
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puts("unlink dd/xx/ff succeeded!\n");
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exit();
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}
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if(unlink("dd/ff/ff") == 0){
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puts("unlink dd/ff/ff succeeded!\n");
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exit();
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}
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if(unlink("dd/dd/ff") != 0){
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puts("unlink dd/dd/ff failed\n");
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exit();
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}
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if(unlink("dd/ff") != 0){
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puts("unlink dd/ff failed\n");
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exit();
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}
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// unlink dd/dd
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// unlink dd
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puts("subdir ok\n");
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}
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int
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main(int argc, char *argv[])
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{
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puts("fstests starting\n");
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bigdir();
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subdir();
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// bigdir(); // slow
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concreate();
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linktest();
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unlinkread();
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2
fsvar.h
2
fsvar.h
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@ -10,7 +10,7 @@ struct inode {
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short minor;
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short nlink;
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uint size;
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uint addrs[NDIRECT];
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uint addrs[NADDRS];
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};
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extern uint rootdev;
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30
syscall.c
30
syscall.c
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@ -219,24 +219,34 @@ int
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sys_open(void)
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{
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struct proc *cp = curproc[cpu()];
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struct inode *ip;
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struct inode *ip, *dp;
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uint arg0, arg1;
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int ufd;
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struct fd *fd;
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int l;
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char *last;
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if(fetcharg(0, &arg0) < 0 || fetcharg(1, &arg1) < 0)
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return -1;
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if((l = checkstring(arg0)) < 0)
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return -1;
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if((ip = namei(cp->mem + arg0, NAMEI_LOOKUP, 0)) == 0) {
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if (arg1 & O_CREATE) {
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if (l >= DIRSIZ)
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if(arg1 & O_CREATE){
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dp = namei(cp->mem + arg0, NAMEI_CREATE, 0, &last, &ip);
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if(dp){
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ip = mknod1(dp, last, T_FILE, 0, 0);
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iput(dp);
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if(ip == 0)
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return -1;
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} else if(ip == 0){
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return -1;
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ip = mknod (cp->mem + arg0, T_FILE, 0, 0);
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if (ip == 0) return -1;
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} else return -1;
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}
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} else {
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ip = namei(cp->mem + arg0, NAMEI_LOOKUP, 0, 0, 0);
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if(ip == 0)
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return -1;
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}
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if((fd = fd_alloc()) == 0){
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iput(ip);
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return -1;
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@ -316,7 +326,7 @@ sys_mkdir(void)
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de.inum = nip->inum;
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writei (nip, (char *) &de, 0, sizeof(de));
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pip = namei(".", NAMEI_LOOKUP, 0);
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pip = namei(".", NAMEI_LOOKUP, 0, 0, 0);
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de.inum = pip->inum;
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de.name[1] = '.';
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iput(pip);
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@ -344,7 +354,7 @@ sys_chdir(void)
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if(l >= DIRSIZ)
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return -1;
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if ((ip = namei(cp->mem + arg0, NAMEI_LOOKUP, 0)) == 0)
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if ((ip = namei(cp->mem + arg0, NAMEI_LOOKUP, 0, 0, 0)) == 0)
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return -1;
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if (ip == cp->cwd) {
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@ -475,7 +485,7 @@ sys_exec(void)
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return -1;
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if(checkstring(arg0) < 0)
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return -1;
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ip = namei(cp->mem + arg0, NAMEI_LOOKUP, 0);
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ip = namei(cp->mem + arg0, NAMEI_LOOKUP, 0, 0, 0);
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if(ip == 0)
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return -1;
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