bsd/isofs/cd9660/cd9660_node.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*      $NetBSD: cd9660_node.c,v 1.13 1994/12/24 15:30:07 cgd Exp $     */
  23
  24 /*-
  25  * Copyright (c) 1982, 1986, 1989, 1994
  26  *      The Regents of the University of California.  All rights reserved.
  27  *
  28  * This code is derived from software contributed to Berkeley
  29  * by Pace Willisson (pace@blitz.com).  The Rock Ridge Extension
  30  * Support code is derived from software contributed to Berkeley
  31  * by Atsushi Murai (amurai@spec.co.jp).
  32  *
  33  * Redistribution and use in source and binary forms, with or without
  34  * modification, are permitted provided that the following conditions
  35  * are met:
  36  * 1. Redistributions of source code must retain the above copyright
  37  *    notice, this list of conditions and the following disclaimer.
  38  * 2. Redistributions in binary form must reproduce the above copyright
  39  *    notice, this list of conditions and the following disclaimer in the
  40  *    documentation and/or other materials provided with the distribution.
  41  * 3. All advertising materials mentioning features or use of this software
  42  *    must display the following acknowledgement:
  43  *      This product includes software developed by the University of
  44  *      California, Berkeley and its contributors.
  45  * 4. Neither the name of the University nor the names of its contributors
  46  *    may be used to endorse or promote products derived from this software
  47  *    without specific prior written permission.
  48  *
  49  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  50  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  51  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  52  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  53  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  54  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  55  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  56  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  57  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  58  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  59  * SUCH DAMAGE.
  60  *
  61  *      @(#)cd9660_node.c       8.5 (Berkeley) 12/5/94
  62
  63
  64
  65  * HISTORY
  66  * 22-Jan-98    radar 1669467 - ISO 9660 CD support - jwc
  67  * 17-Feb-98    radar 1669467 - changed lock protocols to use the lock manager - chw
  68
  69  */
  70
  71 #include <sys/param.h>
  72 #include <sys/systm.h>
  73 #include <sys/mount.h>
  74 #include <sys/proc.h>
  75 #include <sys/file.h>
  76 #include <sys/buf.h>
  77 #include <sys/vnode.h>
  78 #include <sys/kernel.h>
  79 #include <sys/malloc.h>
  80 #include <sys/stat.h>
  81 #include <sys/lock.h>
  82
  83 #include <isofs/cd9660/iso.h>
  84 #include <isofs/cd9660/cd9660_node.h>
  85 #include <isofs/cd9660/iso_rrip.h>
  86 #include <isofs/cd9660/cd9660_mount.h>
  87
  88 /*
  89  * Structures associated with iso_node caching.
  90  */
  91 struct iso_node **isohashtbl;
  92 u_long isohash;
  93 #define INOHASH(device, inum)   (((device) + ((inum)>>12)) & isohash)
  94
  95 #ifdef ISODEVMAP
  96 struct iso_node **idvhashtbl;
  97 u_long idvhash;
  98 #define DNOHASH(device, inum)   (((device) + ((inum)>>12)) & idvhash)
  99 #endif
 100
 101 /* defined in bsd/ufs/ufs/ufs_inode.c */
 102 extern int prtactive;   /* 1 => print out reclaim of active vnodes */
 103
 104 extern void cache_purge (struct vnode *vp);
 105
 106 extern u_char isonullname[];
 107 /*
 108  * Initialize hash links for inodes and dnodes.
 109  */
 110 int
 111 cd9660_init()
 112 {
 113
 114         isohashtbl = hashinit(desiredvnodes, M_ISOFSMNT, &isohash);
 115 #ifdef ISODEVMAP
 116         idvhashtbl = hashinit(desiredvnodes / 8, M_ISOFSMNT, &idvhash);
 117 #endif
 118     return 0;
 119 }
 120
 121 #ifdef ISODEVMAP
 122 /*
 123  * Enter a new node into the device hash list
 124  */
 125 struct iso_dnode *
 126 iso_dmap(device, inum, create)
 127         dev_t   device;
 128         ino_t   inum;
 129         int     create;
 130 {
 131         register struct iso_dnode **dpp, *dp, *dq;
 132
 133         dpp = &idvhashtbl[DNOHASH(device, inum)];
 134         for (dp = *dpp;; dp = dp->d_next) {
 135                 if (dp == NULL)
 136                         return (NULL);
 137                 if (inum == dp->i_number && device == dp->i_dev)
 138                         return (dp);
 139
 140         if (!create)
 141                 return (NULL);
 142
 143         MALLOC(dp, struct iso_dnode *, sizeof(struct iso_dnode), M_CACHE,
 144                M_WAITOK);
 145         dp->i_dev = dev;
 146         dp->i_number = ino;
 147
 148         if (dq = *dpp)
 149                 dq->d_prev = dp->d_next;
 150         dp->d_next = dq;
 151         dp->d_prev = dpp;
 152         *dpp = dp;
 153
 154         return (dp);
 155 }
 156
 157 void
 158 iso_dunmap(device)
 159         dev_t device;
 160 {
 161         struct iso_dnode **dpp, *dp, *dq;
 162
 163         for (dpp = idvhashtbl; dpp <= idvhashtbl + idvhash; dpp++) {
 164                 for (dp = *dpp; dp != NULL; dp = dq)
 165                         dq = dp->d_next;
 166                         if (device == dp->i_dev) {
 167                                 if (dq)
 168                                         dq->d_prev = dp->d_prev;
 169                                 *dp->d_prev = dq;
 170                                 FREE(dp, M_CACHE);
 171                         }
 172                 }
 173         }
 174 }
 175 #endif
 176
 177 /*
 178  * Use the device/inum pair to find the incore inode, and return a pointer
 179  * to it. If it is in core, but locked, wait for it.
 180  */
 181 struct vnode *
 182 cd9660_ihashget(device, inum, p)
 183         dev_t device;
 184         ino_t inum;
 185         struct proc *p;
 186 {
 187         register struct iso_node *ip;
 188         struct vnode *vp;
 189
 190         for (;;)
 191                 for (ip = isohashtbl[INOHASH(device, inum)];; ip = ip->i_next) {
 192                         if (ip == NULL)
 193                                 return (NULL);
 194                         if (inum == ip->i_number && device == ip->i_dev) {
 195                                 /*
 196                                  * This is my most dangerous change.  I am not waiting for
 197                                  * the inode lock anymore (ufs doesn't, why should we) and
 198                                  * I'm worried because there is not lock on the hashtable,
 199                                  * but there wasn't before so I'll let it go for now.
 200                                  * -- chw --
 201                                  */
 202                                 vp = ITOV(ip);
 203                                 simple_lock(&vp->v_interlock);
 204                                 if (!vget(vp, LK_EXCLUSIVE | LK_INTERLOCK | LK_RETRY, p))
 205                                         return (vp);
 206                                 break;
 207                         }
 208                 }
 209         /* NOTREACHED */
 210 }
 211
 212 /*
 213  * Insert the inode into the hash table, and return it locked.
 214  */
 215 void
 216 cd9660_ihashins(ip)
 217         struct iso_node *ip;
 218 {
 219         struct iso_node **ipp, *iq;
 220         struct proc *p = current_proc();
 221
 222         /* lock the inode, then put it on the appropriate hash list */
 223         lockmgr(&ip->i_lock, LK_EXCLUSIVE, (struct slock *)0, p);
 224
 225         ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)];
 226         if ((iq = *ipp))
 227                 iq->i_prev = &ip->i_next;
 228         ip->i_next = iq;
 229         ip->i_prev = ipp;
 230         *ipp = ip;
 231         }
 232
 233 /*
 234  * Remove the inode from the hash table.
 235  */
 236 void
 237 cd9660_ihashrem(ip)
 238         register struct iso_node *ip;
 239 {
 240         register struct iso_node *iq;
 241
 242         if ((iq = ip->i_next))
 243                 iq->i_prev = ip->i_prev;
 244         *ip->i_prev = iq;
 245 #if 1 /* was ifdef DIAGNOSTIC */
 246         ip->i_next = NULL;
 247         ip->i_prev = NULL;
 248 #endif
 249 }
 250
 251 /*
 252  * Last reference to an inode, write the inode out and if necessary,
 253  * truncate and deallocate the file.
 254  */
 255 int
 256 cd9660_inactive(ap)
 257         struct vop_inactive_args /* {
 258                 struct vnode *a_vp;
 259                 struct proc *a_p;
 260         } */ *ap;
 261 {
 262         struct vnode *vp = ap->a_vp;
 263         struct proc *p = ap->a_p;
 264         register struct iso_node *ip = VTOI(vp);
 265         int error = 0;
 266
 267         if (prtactive && vp->v_usecount != 0)
 268                 vprint("cd9660_inactive: pushing active", vp);
 269         /*
 270          * We need to unlock the inode here. If we don't panics or
 271          * hangs will ensue. Our callers expect us to take care of this.
 272          */
 273
 274         VOP_UNLOCK(vp,0,p);
 275
 276         /*
 277          * If we are done with the inode, reclaim it
 278          * so that it can be reused immediately.
 279          */
 280         if (vp->v_usecount == 0 && ip->inode.iso_mode == 0)
 281                 vgone(vp);
 282
 283         return error;
 284 }
 285
 286 /*
 287  * Reclaim an inode so that it can be used for other purposes.
 288  */
 289 int
 290 cd9660_reclaim(ap)
 291         struct vop_reclaim_args /* {
 292                 struct vnode *a_vp;
 293         } */ *ap;
 294 {
 295         register struct vnode *vp = ap->a_vp;
 296         register struct iso_node *ip = VTOI(vp);
 297
 298         if (prtactive && vp->v_usecount != 0)
 299                 vprint("cd9660_reclaim: pushing active", vp);
 300         /*
 301          * Remove the inode from its hash chain.
 302          */
 303         cd9660_ihashrem(ip);
 304         /*
 305          * Purge old data structures associated with the inode.
 306          */
 307         cache_purge(vp);
 308         if (ip->i_devvp) {
 309                 vrele(ip->i_devvp);
 310                 ip->i_devvp = 0;
 311         }
 312         if (ip->i_namep != isonullname)
 313                 FREE(ip->i_namep, M_TEMP);
 314         FREE_ZONE(vp->v_data, sizeof(struct iso_node), M_ISOFSNODE);
 315         vp->v_data = NULL;
 316         return (0);
 317 }
 318
 319 /*
 320  * File attributes
 321  */
 322 void
 323 cd9660_defattr(isodir, inop, bp)
 324         struct iso_directory_record *isodir;
 325         struct iso_node *inop;
 326         struct buf *bp;
 327 {
 328         struct buf *bp2 = NULL;
 329         struct iso_mnt *imp;
 330         struct iso_extended_attributes *ap = NULL;
 331         int off;
 332
 333         if ( isonum_711(isodir->flags) & directoryBit ) {
 334                 inop->inode.iso_mode = S_IFDIR;
 335                 /*
 336                  * If we return 2, fts() will assume there are no subdirectories
 337                  * (just links for the path and .), so instead we return 1.
 338                  */
 339                 inop->inode.iso_links = 1;
 340         } else {
 341                 inop->inode.iso_mode = S_IFREG;
 342                 inop->inode.iso_links = 1;
 343         }
 344         if (!bp
 345             && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
 346             && (off = isonum_711(isodir->ext_attr_length))) {
 347                 VOP_BLKATOFF(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
 348                              &bp2);
 349                 bp = bp2;
 350         }
 351         if (bp) {
 352                 ap = (struct iso_extended_attributes *)bp->b_data;
 353
 354                 if (isonum_711(ap->version) == 1) {
 355                         if (!(ap->perm[0]&0x40))
 356                                 inop->inode.iso_mode |= VEXEC >> 6;
 357                         if (!(ap->perm[0]&0x10))
 358                                 inop->inode.iso_mode |= VREAD >> 6;
 359                         if (!(ap->perm[0]&4))
 360                                 inop->inode.iso_mode |= VEXEC >> 3;
 361                         if (!(ap->perm[0]&1))
 362                                 inop->inode.iso_mode |= VREAD >> 3;
 363                         if (!(ap->perm[1]&0x40))
 364                                 inop->inode.iso_mode |= VEXEC;
 365                         if (!(ap->perm[1]&0x10))
 366                                 inop->inode.iso_mode |= VREAD;
 367                         inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */
 368                         inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */
 369                 } else
 370                         ap = NULL;
 371         }
 372         if (!ap) {
 373                 inop->inode.iso_mode |= VREAD|VEXEC|(VREAD|VEXEC)>>3|(VREAD|VEXEC)>>6;
 374                 inop->inode.iso_uid = (uid_t)0;
 375                 inop->inode.iso_gid = (gid_t)0;
 376         }
 377         if (bp2)
 378                 brelse(bp2);
 379 }
 380
 381 /*
 382  * Time stamps
 383  */
 384 void
 385 cd9660_deftstamp(isodir,inop,bp)
 386         struct iso_directory_record *isodir;
 387         struct iso_node *inop;
 388         struct buf *bp;
 389 {
 390         struct buf *bp2 = NULL;
 391         struct iso_mnt *imp;
 392         struct iso_extended_attributes *ap = NULL;
 393         int off;
 394
 395         if (!bp
 396             && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
 397             && (off = isonum_711(isodir->ext_attr_length)))
 398         {
 399                 VOP_BLKATOFF(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL, &bp2);
 400                 bp = bp2;
 401         }
 402         if (bp) {
 403                 ap = (struct iso_extended_attributes *)bp->b_data;
 404
 405                 if (isonum_711(ap->version) == 1) {
 406                         if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime))
 407                                 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime);
 408                         if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime))
 409                                 inop->inode.iso_ctime = inop->inode.iso_atime;
 410                         if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime))
 411                                 inop->inode.iso_mtime = inop->inode.iso_ctime;
 412                 } else
 413                         ap = NULL;
 414         }
 415         if (!ap) {
 416                 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime);
 417                 inop->inode.iso_atime = inop->inode.iso_ctime;
 418                 inop->inode.iso_mtime = inop->inode.iso_ctime;
 419         }
 420         if (bp2)
 421                 brelse(bp2);
 422 }
 423
 424 int
 425 cd9660_tstamp_conv7(pi,pu)
 426         u_char *pi;
 427         struct timespec *pu;
 428 {
 429         int crtime, days;
 430         int y, m, d, hour, minute, second, tz;
 431
 432         y = pi[0] + 1900;
 433         m = pi[1];
 434         d = pi[2];
 435         hour = pi[3];
 436         minute = pi[4];
 437         second = pi[5];
 438         tz = pi[6];
 439
 440         if (y < 1970) {
 441                 pu->tv_sec  = 0;
 442                 pu->tv_nsec = 0;
 443                 return 0;
 444         } else {
 445 #ifdef  ORIGINAL
 446                 /* computes day number relative to Sept. 19th,1989 */
 447                 /* don't even *THINK* about changing formula. It works! */
 448                 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100;
 449 #else
 450                 /*
 451                  * Changed :-) to make it relative to Jan. 1st, 1970
 452                  * and to disambiguate negative division
 453                  */
 454                 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239;
 455 #endif
 456                 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second;
 457
 458                 /* timezone offset is unreliable on some disks */
 459                 if (-48 <= tz && tz <= 52)
 460                         crtime -= tz * 15 * 60;
 461         }
 462         pu->tv_sec  = crtime;
 463         pu->tv_nsec = 0;
 464         return 1;
 465 }
 466
 467 static u_int
 468 cd9660_chars2ui(begin,len)
 469         u_char *begin;
 470         int len;
 471 {
 472         u_int rc;
 473
 474         for (rc = 0; --len >= 0;) {
 475                 rc *= 10;
 476                 rc += *begin++ - '0';
 477         }
 478         return rc;
 479 }
 480
 481 int
 482 cd9660_tstamp_conv17(pi,pu)
 483         u_char *pi;
 484         struct timespec *pu;
 485 {
 486         u_char buf[7];
 487
 488         /* year:"0001"-"9999" -> -1900  */
 489         buf[0] = cd9660_chars2ui(pi,4) - 1900;
 490
 491         /* month: " 1"-"12"      -> 1 - 12 */
 492         buf[1] = cd9660_chars2ui(pi + 4,2);
 493
 494         /* day:   " 1"-"31"      -> 1 - 31 */
 495         buf[2] = cd9660_chars2ui(pi + 6,2);
 496
 497         /* hour:  " 0"-"23"      -> 0 - 23 */
 498         buf[3] = cd9660_chars2ui(pi + 8,2);
 499
 500         /* minute:" 0"-"59"      -> 0 - 59 */
 501         buf[4] = cd9660_chars2ui(pi + 10,2);
 502
 503         /* second:" 0"-"59"      -> 0 - 59 */
 504         buf[5] = cd9660_chars2ui(pi + 12,2);
 505
 506         /* difference of GMT */
 507         buf[6] = pi[16];
 508
 509         return cd9660_tstamp_conv7(buf,pu);
 510 }
 511
 512 ino_t
 513 isodirino(isodir, imp)
 514         struct iso_directory_record *isodir;
 515         struct iso_mnt *imp;
 516 {
 517         ino_t ino;
 518
 519         ino = (isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length))
 520               << imp->im_bshift;
 521         return (ino);
 522 }