111a9947fSrtm #include "types.h" 211a9947fSrtm #include "param.h" 311a9947fSrtm #include "x86.h" 411a9947fSrtm #include "mmu.h" 511a9947fSrtm #include "proc.h" 611a9947fSrtm #include "defs.h" 711a9947fSrtm #include "spinlock.h" 811a9947fSrtm #include "buf.h" 911a9947fSrtm #include "fs.h" 1011a9947fSrtm #include "fsvar.h" 116fa5ffb5Skaashoek #include "dev.h" 1211a9947fSrtm 1311a9947fSrtm // these are inodes currently in use 1411a9947fSrtm // an entry is free if count == 0 1511a9947fSrtm struct inode inode[NINODE]; 165be0039cSrtm struct spinlock inode_table_lock; 1711a9947fSrtm 189d3fb671Srtm uint rootdev = 1; 199d3fb671Srtm 205be0039cSrtm void 215be0039cSrtm iinit(void) 225be0039cSrtm { 235be0039cSrtm initlock(&inode_table_lock, "inode_table"); 245be0039cSrtm } 255be0039cSrtm 2624111398Skaashoek static uint 2724111398Skaashoek balloc(uint dev) 2824111398Skaashoek { 2924111398Skaashoek int b; 3024111398Skaashoek struct buf *bp; 3124111398Skaashoek struct superblock *sb; 3228d9ef04Skaashoek int bi = 0; 3324111398Skaashoek int size; 3424111398Skaashoek int ninodes; 3524111398Skaashoek uchar m; 3624111398Skaashoek 3724111398Skaashoek bp = bread(dev, 1); 3824111398Skaashoek sb = (struct superblock *) bp->data; 3924111398Skaashoek size = sb->size; 4024111398Skaashoek ninodes = sb->ninodes; 4124111398Skaashoek 4224111398Skaashoek for (b = 0; b < size; b++) { 4324111398Skaashoek if (b % BPB == 0) { 4424111398Skaashoek brelse(bp); 4524111398Skaashoek bp = bread(dev, BBLOCK(b, ninodes)); 4624111398Skaashoek } 4724111398Skaashoek bi = b % BPB; 4824111398Skaashoek m = 0x1 << (bi % 8); 4924111398Skaashoek if ((bp->data[bi/8] & m) == 0) { // is block free? 5024111398Skaashoek break; 5124111398Skaashoek } 5224111398Skaashoek } 5324111398Skaashoek if (b >= size) 5424111398Skaashoek panic("balloc: out of blocks\n"); 5524111398Skaashoek 5624111398Skaashoek cprintf ("balloc: allocate block %d\n", b); 5724111398Skaashoek bp->data[bi/8] |= 0x1 << (bi % 8); 5824111398Skaashoek bwrite (dev, bp, BBLOCK(b, ninodes)); // mark it allocated on disk 5928d9ef04Skaashoek brelse(bp); 6024111398Skaashoek return b; 6124111398Skaashoek } 6224111398Skaashoek 6328d9ef04Skaashoek static void 6428d9ef04Skaashoek bfree(int dev, uint b) 6528d9ef04Skaashoek { 6628d9ef04Skaashoek struct buf *bp; 6728d9ef04Skaashoek struct superblock *sb; 6828d9ef04Skaashoek int bi; 6928d9ef04Skaashoek int ninodes; 7028d9ef04Skaashoek uchar m; 7128d9ef04Skaashoek 7228d9ef04Skaashoek cprintf ("bfree: free block %d\n", b); 7328d9ef04Skaashoek bp = bread(dev, 1); 7428d9ef04Skaashoek sb = (struct superblock *) bp->data; 7528d9ef04Skaashoek ninodes = sb->ninodes; 7628d9ef04Skaashoek brelse(bp); 7728d9ef04Skaashoek 7828d9ef04Skaashoek bp = bread(dev, BBLOCK(b, ninodes)); 7928d9ef04Skaashoek bi = b % BPB; 8028d9ef04Skaashoek m = ~(0x1 << (bi %8)); 8128d9ef04Skaashoek bp->data[bi/8] &= m; 8228d9ef04Skaashoek bwrite (dev, bp, BBLOCK(b, ninodes)); // mark it free on disk 8328d9ef04Skaashoek brelse(bp); 8428d9ef04Skaashoek } 8524111398Skaashoek 869d3fb671Srtm // returns an inode with busy set and incremented reference count. 8711a9947fSrtm struct inode * 8811a9947fSrtm iget(uint dev, uint inum) 8911a9947fSrtm { 9011a9947fSrtm struct inode *ip, *nip = 0; 9111a9947fSrtm struct dinode *dip; 9211a9947fSrtm struct buf *bp; 9311a9947fSrtm 9411a9947fSrtm acquire(&inode_table_lock); 9511a9947fSrtm 9611a9947fSrtm loop: 9711a9947fSrtm for(ip = &inode[0]; ip < &inode[NINODE]; ip++){ 9811a9947fSrtm if(ip->count > 0 && ip->dev == dev && ip->inum == inum){ 9911a9947fSrtm if(ip->busy){ 10011a9947fSrtm sleep(ip, &inode_table_lock); 10111a9947fSrtm goto loop; 10211a9947fSrtm } 10311a9947fSrtm ip->count++; 10417a85657Srtm ip->busy = 1; 10511a9947fSrtm release(&inode_table_lock); 10611a9947fSrtm return ip; 10711a9947fSrtm } 10811a9947fSrtm if(nip == 0 && ip->count == 0) 10911a9947fSrtm nip = ip; 11011a9947fSrtm } 11111a9947fSrtm 11211a9947fSrtm if(nip == 0) 11311a9947fSrtm panic("out of inodes"); 11411a9947fSrtm 11511a9947fSrtm nip->dev = dev; 11611a9947fSrtm nip->inum = inum; 11711a9947fSrtm nip->count = 1; 11811a9947fSrtm nip->busy = 1; 11911a9947fSrtm 12011a9947fSrtm release(&inode_table_lock); 12111a9947fSrtm 12224111398Skaashoek bp = bread(dev, IBLOCK(inum)); 12311a9947fSrtm dip = &((struct dinode *)(bp->data))[inum % IPB]; 12411a9947fSrtm nip->type = dip->type; 125e8d11c2eSkaashoek nip->major = dip->major; 126e8d11c2eSkaashoek nip->minor = dip->minor; 12711a9947fSrtm nip->nlink = dip->nlink; 12811a9947fSrtm nip->size = dip->size; 12911a9947fSrtm memmove(nip->addrs, dip->addrs, sizeof(nip->addrs)); 13011a9947fSrtm brelse(bp); 13111a9947fSrtm 13211a9947fSrtm return nip; 13311a9947fSrtm } 13411a9947fSrtm 13528d9ef04Skaashoek void 13628d9ef04Skaashoek iupdate (struct inode *ip) 13728d9ef04Skaashoek { 13828d9ef04Skaashoek struct buf *bp; 13928d9ef04Skaashoek struct dinode *dip; 14028d9ef04Skaashoek 14128d9ef04Skaashoek bp = bread(ip->dev, IBLOCK(ip->inum)); 14228d9ef04Skaashoek dip = &((struct dinode *)(bp->data))[ip->inum % IPB]; 14328d9ef04Skaashoek dip->type = ip->type; 14428d9ef04Skaashoek dip->major = ip->major; 14528d9ef04Skaashoek dip->minor = ip->minor; 14628d9ef04Skaashoek dip->nlink = ip->nlink; 14728d9ef04Skaashoek dip->size = ip->size; 14828d9ef04Skaashoek memmove(dip->addrs, ip->addrs, sizeof(ip->addrs)); 14928d9ef04Skaashoek bwrite (ip->dev, bp, IBLOCK(ip->inum)); // mark it allocated on the disk 15028d9ef04Skaashoek brelse(bp); 15128d9ef04Skaashoek } 15228d9ef04Skaashoek 153e8d11c2eSkaashoek struct inode * 154e8d11c2eSkaashoek ialloc(uint dev, short type) 155e8d11c2eSkaashoek { 156e8d11c2eSkaashoek struct inode *ip; 157e8d11c2eSkaashoek struct dinode *dip = 0; 158e8d11c2eSkaashoek struct superblock *sb; 159e8d11c2eSkaashoek int ninodes; 160e8d11c2eSkaashoek int inum; 161e8d11c2eSkaashoek struct buf *bp; 162e8d11c2eSkaashoek 163e8d11c2eSkaashoek bp = bread(dev, 1); 16424111398Skaashoek sb = (struct superblock *) bp->data; 165e8d11c2eSkaashoek ninodes = sb->ninodes; 166e8d11c2eSkaashoek brelse(bp); 167e8d11c2eSkaashoek 168e8d11c2eSkaashoek for (inum = 1; inum < ninodes; inum++) { // loop over inode blocks 16924111398Skaashoek bp = bread(dev, IBLOCK(inum)); 170e8d11c2eSkaashoek dip = &((struct dinode *)(bp->data))[inum % IPB]; 171e8d11c2eSkaashoek if (dip->type == 0) { // a free inode 172e8d11c2eSkaashoek break; 173e8d11c2eSkaashoek } 174e8d11c2eSkaashoek brelse(bp); 175e8d11c2eSkaashoek } 176e8d11c2eSkaashoek 177e8d11c2eSkaashoek if (inum >= ninodes) { 17824111398Skaashoek panic ("ialloc: no inodes left\n"); 179e8d11c2eSkaashoek } 180e8d11c2eSkaashoek 181e8d11c2eSkaashoek cprintf ("ialloc: %d\n", inum); 182e8d11c2eSkaashoek dip->type = type; 18324111398Skaashoek bwrite (dev, bp, IBLOCK(inum)); // mark it allocated on the disk 184e8d11c2eSkaashoek brelse(bp); 185e8d11c2eSkaashoek ip = iget (dev, inum); 186e8d11c2eSkaashoek return ip; 187e8d11c2eSkaashoek } 188e8d11c2eSkaashoek 18928d9ef04Skaashoek static void 19024437cd5Skaashoek ifree(struct inode *ip) 191e8d11c2eSkaashoek { 192*0633b971Skaashoek cprintf("ifree: %d\n", ip->inum); 19328d9ef04Skaashoek ip->type = 0; 19428d9ef04Skaashoek iupdate(ip); 195e8d11c2eSkaashoek } 196e8d11c2eSkaashoek 19711a9947fSrtm void 1989d3fb671Srtm ilock(struct inode *ip) 1999d3fb671Srtm { 2009d3fb671Srtm if(ip->count < 1) 2019d3fb671Srtm panic("ilock"); 2029d3fb671Srtm 2039d3fb671Srtm acquire(&inode_table_lock); 2049d3fb671Srtm 2059d3fb671Srtm while(ip->busy) 2069d3fb671Srtm sleep(ip, &inode_table_lock); 2079d3fb671Srtm ip->busy = 1; 2089d3fb671Srtm 2099d3fb671Srtm release(&inode_table_lock); 2109d3fb671Srtm } 2119d3fb671Srtm 2129d3fb671Srtm // caller is holding onto a reference to this inode, but no 2139d3fb671Srtm // longer needs to examine or change it, so clear ip->busy. 2149d3fb671Srtm void 2159d3fb671Srtm iunlock(struct inode *ip) 2169d3fb671Srtm { 2179d3fb671Srtm if(ip->busy != 1) 2189d3fb671Srtm panic("iunlock"); 2199d3fb671Srtm 2209d3fb671Srtm acquire(&inode_table_lock); 2219d3fb671Srtm 2229d3fb671Srtm ip->busy = 0; 2239d3fb671Srtm wakeup(ip); 2249d3fb671Srtm 2259d3fb671Srtm release(&inode_table_lock); 2269d3fb671Srtm } 2279d3fb671Srtm 2289d3fb671Srtm // caller is releasing a reference to this inode. 2299d3fb671Srtm // you must have the inode lock. 2309d3fb671Srtm void 23111a9947fSrtm iput(struct inode *ip) 23211a9947fSrtm { 2339d3fb671Srtm if(ip->count < 1 || ip->busy != 1) 2349d3fb671Srtm panic("iput"); 2359d3fb671Srtm 23611a9947fSrtm acquire(&inode_table_lock); 23711a9947fSrtm 23811a9947fSrtm ip->count -= 1; 23911a9947fSrtm ip->busy = 0; 24011a9947fSrtm wakeup(ip); 24111a9947fSrtm 24211a9947fSrtm release(&inode_table_lock); 24311a9947fSrtm } 2449d3fb671Srtm 2459d3fb671Srtm void 24632630628Srtm idecref(struct inode *ip) 2479d3fb671Srtm { 2489d3fb671Srtm acquire(&inode_table_lock); 2499d3fb671Srtm 25032630628Srtm if(ip->count < 1) 25132630628Srtm panic("idecref"); 25232630628Srtm 25332630628Srtm ip->count -= 1; 2549d3fb671Srtm 2559d3fb671Srtm release(&inode_table_lock); 2569d3fb671Srtm } 2579d3fb671Srtm 2589d3fb671Srtm uint 2599d3fb671Srtm bmap(struct inode *ip, uint bn) 2609d3fb671Srtm { 2619d3fb671Srtm unsigned x; 2629d3fb671Srtm 2639d3fb671Srtm if(bn >= NDIRECT) 2649d3fb671Srtm panic("bmap 1"); 2659d3fb671Srtm x = ip->addrs[bn]; 2669d3fb671Srtm if(x == 0) 2679d3fb671Srtm panic("bmap 2"); 2689d3fb671Srtm return x; 2699d3fb671Srtm } 2709d3fb671Srtm 271c59361f1Srtm #define min(a, b) ((a) < (b) ? (a) : (b)) 272c59361f1Srtm 273c59361f1Srtm int 27417a85657Srtm readi(struct inode *ip, char *dst, uint off, uint n) 275c59361f1Srtm { 276c59361f1Srtm uint target = n, n1; 277c59361f1Srtm struct buf *bp; 278c59361f1Srtm 279939f9edeSkaashoek if (ip->type == T_DEV) { 280939f9edeSkaashoek if (ip->major < 0 || ip->major >= NDEV || !devsw[ip->major].d_read) 281939f9edeSkaashoek return -1; 28217a85657Srtm return devsw[ip->major].d_read (ip->minor, dst, n); 283939f9edeSkaashoek } 284939f9edeSkaashoek 285c59361f1Srtm while(n > 0 && off < ip->size){ 28624111398Skaashoek bp = bread(ip->dev, bmap(ip, off / BSIZE)); 287c59361f1Srtm n1 = min(n, ip->size - off); 28824111398Skaashoek n1 = min(n1, BSIZE - (off % BSIZE)); 28924111398Skaashoek memmove(dst, bp->data + (off % BSIZE), n1); 290c59361f1Srtm n -= n1; 291c59361f1Srtm off += n1; 292c59361f1Srtm dst += n1; 293c59361f1Srtm brelse(bp); 294c59361f1Srtm } 295c59361f1Srtm 296c59361f1Srtm return target - n; 297c59361f1Srtm } 298c59361f1Srtm 29928d9ef04Skaashoek #define MIN(a, b) ((a < b) ? a : b) 30028d9ef04Skaashoek 3016fa5ffb5Skaashoek int 30217a85657Srtm writei(struct inode *ip, char *addr, uint off, uint n) 3036fa5ffb5Skaashoek { 3046fa5ffb5Skaashoek if (ip->type == T_DEV) { 305939f9edeSkaashoek if (ip->major < 0 || ip->major >= NDEV || !devsw[ip->major].d_write) 306939f9edeSkaashoek return -1; 3076fa5ffb5Skaashoek return devsw[ip->major].d_write (ip->minor, addr, n); 30828d9ef04Skaashoek } else if (ip->type == T_FILE || ip->type == T_DIR) { // XXX dir here too? 30928d9ef04Skaashoek struct buf *bp; 31028d9ef04Skaashoek int r = 0; 31128d9ef04Skaashoek int m; 31228d9ef04Skaashoek int lbn; 31328d9ef04Skaashoek uint b; 31428d9ef04Skaashoek while (r < n) { 31528d9ef04Skaashoek lbn = off / BSIZE; 31628d9ef04Skaashoek if (lbn >= NDIRECT) return r; 31728d9ef04Skaashoek if (ip->addrs[lbn] == 0) { 31828d9ef04Skaashoek b = balloc(ip->dev); 31928d9ef04Skaashoek if (b <= 0) return r; 32028d9ef04Skaashoek ip->addrs[lbn] = b; 32128d9ef04Skaashoek } 32228d9ef04Skaashoek m = MIN(BSIZE - off % BSIZE, n-r); 32328d9ef04Skaashoek bp = bread(ip->dev, bmap(ip, off / BSIZE)); 32428d9ef04Skaashoek memmove (bp->data + off % BSIZE, addr, m); 32528d9ef04Skaashoek bwrite (ip->dev, bp, bmap(ip, off/BSIZE)); 32628d9ef04Skaashoek brelse (bp); 32728d9ef04Skaashoek r += m; 32828d9ef04Skaashoek off += m; 32928d9ef04Skaashoek } 33028d9ef04Skaashoek if (r > 0) { 33128d9ef04Skaashoek if (off > ip->size) { 33228d9ef04Skaashoek ip->size = off; 33328d9ef04Skaashoek } 33428d9ef04Skaashoek iupdate(ip); 33528d9ef04Skaashoek } 33628d9ef04Skaashoek return r; 3376fa5ffb5Skaashoek } else { 3386fa5ffb5Skaashoek panic ("writei: unknown type\n"); 3398a8be1b8Srtm return 0; 3406fa5ffb5Skaashoek } 3416fa5ffb5Skaashoek } 3426fa5ffb5Skaashoek 3439d3fb671Srtm struct inode * 344*0633b971Skaashoek namei(char *path, uint *ret_pinum) 3459d3fb671Srtm { 3469d3fb671Srtm struct inode *dp; 3479d3fb671Srtm char *cp = path; 3489d3fb671Srtm uint off, dev; 3499d3fb671Srtm struct buf *bp; 3509d3fb671Srtm struct dirent *ep; 3519d3fb671Srtm int i; 3529d3fb671Srtm unsigned ninum; 353*0633b971Skaashoek unsigned pinum; 3549d3fb671Srtm 3559d3fb671Srtm dp = iget(rootdev, 1); 356*0633b971Skaashoek pinum = dp->inum; 3579d3fb671Srtm 3589d3fb671Srtm while(*cp == '/') 3599d3fb671Srtm cp++; 3609d3fb671Srtm 3619d3fb671Srtm while(1){ 362*0633b971Skaashoek if(*cp == '\0') { 363*0633b971Skaashoek if (ret_pinum) 364*0633b971Skaashoek *ret_pinum = pinum; 3659d3fb671Srtm return dp; 366*0633b971Skaashoek } 3679d3fb671Srtm 3689d3fb671Srtm if(dp->type != T_DIR){ 369*0633b971Skaashoek if (ret_pinum) 370*0633b971Skaashoek *ret_pinum = pinum; 3719d3fb671Srtm iput(dp); 3729d3fb671Srtm return 0; 3739d3fb671Srtm } 3749d3fb671Srtm 37524111398Skaashoek for(off = 0; off < dp->size; off += BSIZE){ 37624111398Skaashoek bp = bread(dp->dev, bmap(dp, off / BSIZE)); 3779d3fb671Srtm for(ep = (struct dirent *) bp->data; 37824111398Skaashoek ep < (struct dirent *) (bp->data + BSIZE); 3799d3fb671Srtm ep++){ 3809d3fb671Srtm if(ep->inum == 0) 3819d3fb671Srtm continue; 3829d3fb671Srtm for(i = 0; i < DIRSIZ && cp[i] != '/' && cp[i]; i++) 3839d3fb671Srtm if(cp[i] != ep->name[i]) 3849d3fb671Srtm break; 3859d3fb671Srtm if((cp[i] == '\0' || cp[i] == '/') && (i >= DIRSIZ || ep->name[i] == '\0')){ 3869d3fb671Srtm ninum = ep->inum; 3879d3fb671Srtm brelse(bp); 3889d3fb671Srtm cp += i; 3899d3fb671Srtm goto found; 3909d3fb671Srtm } 3919d3fb671Srtm } 3929d3fb671Srtm brelse(bp); 3939d3fb671Srtm } 3949d3fb671Srtm iput(dp); 395*0633b971Skaashoek if (ret_pinum) 396*0633b971Skaashoek *ret_pinum = pinum; 3979d3fb671Srtm return 0; 3989d3fb671Srtm 3999d3fb671Srtm found: 4009d3fb671Srtm dev = dp->dev; 401*0633b971Skaashoek pinum = dp->inum; 4029d3fb671Srtm iput(dp); 4039d3fb671Srtm dp = iget(dev, ninum); 4049d3fb671Srtm while(*cp == '/') 4059d3fb671Srtm cp++; 4069d3fb671Srtm } 4079d3fb671Srtm } 408e8d11c2eSkaashoek 409e8d11c2eSkaashoek struct inode * 410*0633b971Skaashoek mknod(char *cp, short type, short major, short minor) 411e8d11c2eSkaashoek { 412*0633b971Skaashoek struct inode *ip, *dp; 413e8d11c2eSkaashoek struct dirent *ep = 0; 414e8d11c2eSkaashoek int off; 415e8d11c2eSkaashoek int i; 416e8d11c2eSkaashoek struct buf *bp = 0; 417*0633b971Skaashoek uint pinum = 0; 418e8d11c2eSkaashoek 419*0633b971Skaashoek cprintf("mknod: %s %d %d %d\n", cp, type, major, minor); 420e8d11c2eSkaashoek 421*0633b971Skaashoek if ((ip = namei(cp, &pinum)) != 0) { 422*0633b971Skaashoek iput(ip); 423*0633b971Skaashoek return 0; 424*0633b971Skaashoek } 425*0633b971Skaashoek cprintf("mknod: pinum = %d\n", pinum); 426*0633b971Skaashoek dp = iget(rootdev, pinum); 427e8d11c2eSkaashoek ip = ialloc(dp->dev, type); 428*0633b971Skaashoek if (ip == 0) { 429*0633b971Skaashoek iput(dp); 430*0633b971Skaashoek return 0; 431*0633b971Skaashoek } 432e8d11c2eSkaashoek ip->major = major; 433e8d11c2eSkaashoek ip->minor = minor; 4346c0e444fSkaashoek ip->size = 0; 4356c0e444fSkaashoek ip->nlink = 0; 4366c0e444fSkaashoek 4376c0e444fSkaashoek iupdate (ip); // write new inode to disk 438e8d11c2eSkaashoek 43924111398Skaashoek for(off = 0; off < dp->size; off += BSIZE) { 44024111398Skaashoek bp = bread(dp->dev, bmap(dp, off / BSIZE)); 441e8d11c2eSkaashoek for(ep = (struct dirent *) bp->data; 44224111398Skaashoek ep < (struct dirent *) (bp->data + BSIZE); 443e8d11c2eSkaashoek ep++){ 444e8d11c2eSkaashoek if(ep->inum == 0) { 445e8d11c2eSkaashoek goto found; 446e8d11c2eSkaashoek } 447e8d11c2eSkaashoek } 448e8d11c2eSkaashoek brelse(bp); 449e8d11c2eSkaashoek } 45028d9ef04Skaashoek panic("mknod: XXXX no dir entry free\n"); 451e8d11c2eSkaashoek 452e8d11c2eSkaashoek found: 453e8d11c2eSkaashoek ep->inum = ip->inum; 454e8d11c2eSkaashoek for(i = 0; i < DIRSIZ && cp[i]; i++) ep->name[i] = cp[i]; 4556c0e444fSkaashoek bwrite (dp->dev, bp, bmap(dp, off/BSIZE)); // write directory block 456e8d11c2eSkaashoek brelse(bp); 4576c0e444fSkaashoek dp->size += sizeof(struct dirent); // update directory inode 4586c0e444fSkaashoek iupdate (dp); 459*0633b971Skaashoek iput(dp); 460e8d11c2eSkaashoek return ip; 461e8d11c2eSkaashoek } 46224437cd5Skaashoek 46324437cd5Skaashoek int 46424437cd5Skaashoek unlink(char *cp) 46524437cd5Skaashoek { 46624437cd5Skaashoek int i; 46724437cd5Skaashoek struct inode *ip, *dp; 46824437cd5Skaashoek struct dirent *ep = 0; 46924437cd5Skaashoek int off; 47024437cd5Skaashoek struct buf *bp = 0; 471*0633b971Skaashoek uint pinum; 47224437cd5Skaashoek 473*0633b971Skaashoek if ((ip = namei(cp, &pinum)) == 0) { 47424437cd5Skaashoek cprintf("file to be unlinked doesn't exist\n"); 47524437cd5Skaashoek return -1; 47624437cd5Skaashoek } 47724437cd5Skaashoek 47824437cd5Skaashoek ip->nlink--; 47924437cd5Skaashoek if (ip->nlink > 0) { 48024437cd5Skaashoek iupdate(ip); 48124437cd5Skaashoek iput(ip); // is this the right order? 48224437cd5Skaashoek return 0; 48324437cd5Skaashoek } 48424437cd5Skaashoek 48524437cd5Skaashoek // free inode, its blocks, and remove dir entry 48624437cd5Skaashoek for (i = 0; i < NDIRECT; i++) { 48724437cd5Skaashoek if (ip->addrs[i] != 0) { 48824437cd5Skaashoek bfree(ip->dev, ip->addrs[i]); 48924437cd5Skaashoek ip->addrs[i] = 0; 49024437cd5Skaashoek } 49124437cd5Skaashoek } 49224437cd5Skaashoek ip->size = 0; 49324437cd5Skaashoek ip->major = 0; 49424437cd5Skaashoek ip->minor = 0; 49524437cd5Skaashoek iupdate(ip); 49624437cd5Skaashoek ifree(ip); // is this the right order? 49724437cd5Skaashoek 498*0633b971Skaashoek dp = iget(rootdev, pinum); 49924437cd5Skaashoek for(off = 0; off < dp->size; off += BSIZE) { 50024437cd5Skaashoek bp = bread(dp->dev, bmap(dp, off / BSIZE)); 50124437cd5Skaashoek for(ep = (struct dirent *) bp->data; 50224437cd5Skaashoek ep < (struct dirent *) (bp->data + BSIZE); 50324437cd5Skaashoek ep++){ 50424437cd5Skaashoek if(ep->inum == ip->inum) { 50524437cd5Skaashoek goto found; 50624437cd5Skaashoek } 50724437cd5Skaashoek } 50824437cd5Skaashoek brelse(bp); 50924437cd5Skaashoek } 51024437cd5Skaashoek panic("mknod: XXXX no dir entry free\n"); 51124437cd5Skaashoek 51224437cd5Skaashoek found: 51324437cd5Skaashoek ep->inum = 0; 51424437cd5Skaashoek bwrite (dp->dev, bp, bmap(dp, off/BSIZE)); // write directory block 51524437cd5Skaashoek brelse(bp); 51624437cd5Skaashoek iput(ip); 51724437cd5Skaashoek iupdate (dp); 51824437cd5Skaashoek iput(dp); 51924437cd5Skaashoek return 0; 52024437cd5Skaashoek } 521