bsd/isofs/cd9660/cd9660_node.c

   1 /*
   2  * Copyright (c) 2000-2003 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 #include <sys/namei.h>
  83
  84 #include <isofs/cd9660/iso.h>
  85 #include <isofs/cd9660/cd9660_node.h>
  86 #include <isofs/cd9660/iso_rrip.h>
  87 #include <isofs/cd9660/cd9660_mount.h>
  88
  89 /*
  90  * Structures associated with iso_node caching.
  91  */
  92 struct iso_node **isohashtbl;
  93 u_long isohash;
  94 #define INOHASH(device, inum)   (((device) + ((inum)>>12)) & isohash)
  95
  96 #ifdef ISODEVMAP
  97 struct iso_node **idvhashtbl;
  98 u_long idvhash;
  99 #define DNOHASH(device, inum)   (((device) + ((inum)>>12)) & idvhash)
 100 #endif
 101
 102 /* defined in bsd/vfs/vfs_subr.c */
 103 extern int prtactive;   /* 1 => print out reclaim of active vnodes */
 104
 105 extern u_char isonullname[];
 106 /*
 107  * Initialize hash links for inodes and dnodes.
 108  */
 109 int
 110 cd9660_init()
 111 {
 112
 113         isohashtbl = hashinit(desiredvnodes, M_ISOFSMNT, &isohash);
 114 #ifdef ISODEVMAP
 115         idvhashtbl = hashinit(desiredvnodes / 8, M_ISOFSMNT, &idvhash);
 116 #endif
 117     return 0;
 118 }
 119
 120 #ifdef ISODEVMAP
 121 /*
 122  * Enter a new node into the device hash list
 123  */
 124 struct iso_dnode *
 125 iso_dmap(device, inum, create)
 126         dev_t   device;
 127         ino_t   inum;
 128         int     create;
 129 {
 130         register struct iso_dnode **dpp, *dp, *dq;
 131
 132         dpp = &idvhashtbl[DNOHASH(device, inum)];
 133         for (dp = *dpp;; dp = dp->d_next) {
 134                 if (dp == NULL)
 135                         return (NULL);
 136                 if (inum == dp->i_number && device == dp->i_dev)
 137                         return (dp);
 138
 139         if (!create)
 140                 return (NULL);
 141
 142         MALLOC(dp, struct iso_dnode *, sizeof(struct iso_dnode), M_CACHE,
 143                M_WAITOK);
 144         dp->i_dev = dev;
 145         dp->i_number = ino;
 146
 147         if (dq = *dpp)
 148                 dq->d_prev = dp->d_next;
 149         dp->d_next = dq;
 150         dp->d_prev = dpp;
 151         *dpp = dp;
 152
 153         return (dp);
 154 }
 155
 156 void
 157 iso_dunmap(device)
 158         dev_t device;
 159 {
 160         struct iso_dnode **dpp, *dp, *dq;
 161
 162         for (dpp = idvhashtbl; dpp <= idvhashtbl + idvhash; dpp++) {
 163                 for (dp = *dpp; dp != NULL; dp = dq)
 164                         dq = dp->d_next;
 165                         if (device == dp->i_dev) {
 166                                 if (dq)
 167                                         dq->d_prev = dp->d_prev;
 168                                 *dp->d_prev = dq;
 169                                 FREE(dp, M_CACHE);
 170                         }
 171                 }
 172         }
 173 }
 174 #endif
 175
 176 /*
 177  * Use the device/inum pair to find the incore inode, and return a pointer
 178  * to it. If it is in core, but locked, wait for it.
 179  */
 180 struct vnode *
 181 cd9660_ihashget(device, inum, p)
 182         dev_t device;
 183         ino_t inum;
 184         struct proc *p;
 185 {
 186         register struct iso_node *ip;
 187         struct vnode *vp;
 188
 189         for (;;)
 190                 for (ip = isohashtbl[INOHASH(device, inum)];; ip = ip->i_next) {
 191                         if (ip == NULL)
 192                                 return (NULL);
 193                         if (inum == ip->i_number && device == ip->i_dev) {
 194                                 /*
 195                                  * This is my most dangerous change.  I am not waiting for
 196                                  * the inode lock anymore (ufs doesn't, why should we) and
 197                                  * I'm worried because there is not lock on the hashtable,
 198                                  * but there wasn't before so I'll let it go for now.
 199                                  * -- chw --
 200                                  */
 201                                 vp = ITOV(ip);
 202                                 simple_lock(&vp->v_interlock);
 203                                 if (!vget(vp, LK_EXCLUSIVE | LK_INTERLOCK | LK_RETRY, p))
 204                                         return (vp);
 205                                 break;
 206                         }
 207                 }
 208         /* NOTREACHED */
 209 }
 210
 211 /*
 212  * Insert the inode into the hash table, and return it locked.
 213  */
 214 void
 215 cd9660_ihashins(ip)
 216         struct iso_node *ip;
 217 {
 218         struct iso_node **ipp, *iq;
 219         struct proc *p = current_proc();
 220
 221         /* lock the inode, then put it on the appropriate hash list */
 222         lockmgr(&ip->i_lock, LK_EXCLUSIVE, (struct slock *)0, p);
 223
 224         ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)];
 225         if ((iq = *ipp))
 226                 iq->i_prev = &ip->i_next;
 227         ip->i_next = iq;
 228         ip->i_prev = ipp;
 229         *ipp = ip;
 230         }
 231
 232 /*
 233  * Remove the inode from the hash table.
 234  */
 235 void
 236 cd9660_ihashrem(ip)
 237         register struct iso_node *ip;
 238 {
 239         register struct iso_node *iq;
 240
 241         if ((iq = ip->i_next))
 242                 iq->i_prev = ip->i_prev;
 243         *ip->i_prev = iq;
 244 #if 1 /* was ifdef DIAGNOSTIC */
 245         ip->i_next = NULL;
 246         ip->i_prev = NULL;
 247 #endif
 248 }
 249
 250 /*
 251  * Last reference to an inode, write the inode out and if necessary,
 252  * truncate and deallocate the file.
 253  */
 254 int
 255 cd9660_inactive(ap)
 256         struct vop_inactive_args /* {
 257                 struct vnode *a_vp;
 258                 struct proc *a_p;
 259         } */ *ap;
 260 {
 261         struct vnode *vp = ap->a_vp;
 262         struct proc *p = ap->a_p;
 263         register struct iso_node *ip = VTOI(vp);
 264         int error = 0;
 265
 266         if (prtactive && vp->v_usecount != 0)
 267                 vprint("cd9660_inactive: pushing active", vp);
 268         /*
 269          * We need to unlock the inode here. If we don't panics or
 270          * hangs will ensue. Our callers expect us to take care of this.
 271          */
 272
 273         VOP_UNLOCK(vp,0,p);
 274
 275         /*
 276          * If we are done with the inode, reclaim it
 277          * so that it can be reused immediately.
 278          */
 279         if (vp->v_usecount == 0 && ip->inode.iso_mode == 0)
 280                 vgone(vp);
 281
 282         return error;
 283 }
 284
 285 /*
 286  * Reclaim an inode so that it can be used for other purposes.
 287  */
 288 int
 289 cd9660_reclaim(ap)
 290         struct vop_reclaim_args /* {
 291                 struct vnode *a_vp;
 292         } */ *ap;
 293 {
 294         register struct vnode *vp = ap->a_vp;
 295         register struct iso_node *ip = VTOI(vp);
 296
 297         if (prtactive && vp->v_usecount != 0)
 298                 vprint("cd9660_reclaim: pushing active", vp);
 299         /*
 300          * Remove the inode from its hash chain.
 301          */
 302         cd9660_ihashrem(ip);
 303         /*
 304          * Purge old data structures associated with the inode.
 305          */
 306         cache_purge(vp);
 307         if (ip->i_devvp) {
 308                 struct vnode *tvp = ip->i_devvp;
 309                 ip->i_devvp = NULL;
 310                 vrele(tvp);
 311         }
 312         if (ip->i_namep != isonullname)
 313                 FREE(ip->i_namep, M_TEMP);
 314         if (ip->i_riff != NULL)
 315                 FREE(ip->i_riff, M_TEMP);
 316         FREE_ZONE(vp->v_data, sizeof(struct iso_node), M_ISOFSNODE);
 317         vp->v_data = NULL;
 318         return (0);
 319 }
 320
 321 /*
 322  * File attributes
 323  */
 324 void
 325 cd9660_defattr(isodir, inop, bp)
 326         struct iso_directory_record *isodir;
 327         struct iso_node *inop;
 328         struct buf *bp;
 329 {
 330         struct buf *bp2 = NULL;
 331         struct iso_mnt *imp;
 332         struct iso_extended_attributes *ap = NULL;
 333         int off;
 334
 335         if ( isonum_711(isodir->flags) & directoryBit ) {
 336                 inop->inode.iso_mode = S_IFDIR;
 337                 /*
 338                  * If we return 2, fts() will assume there are no subdirectories
 339                  * (just links for the path and .), so instead we return 1.
 340                  */
 341                 inop->inode.iso_links = 1;
 342         } else {
 343                 inop->inode.iso_mode = S_IFREG;
 344                 inop->inode.iso_links = 1;
 345         }
 346         if (!bp
 347             && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
 348             && (off = isonum_711(isodir->ext_attr_length))) {
 349                 VOP_BLKATOFF(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
 350                              &bp2);
 351                 bp = bp2;
 352         }
 353         if (bp) {
 354                 ap = (struct iso_extended_attributes *)bp->b_data;
 355
 356                 if (isonum_711(ap->version) == 1) {
 357                         if (!(ap->perm[0]&0x40))
 358                                 inop->inode.iso_mode |= VEXEC >> 6;
 359                         if (!(ap->perm[0]&0x10))
 360                                 inop->inode.iso_mode |= VREAD >> 6;
 361                         if (!(ap->perm[0]&4))
 362                                 inop->inode.iso_mode |= VEXEC >> 3;
 363                         if (!(ap->perm[0]&1))
 364                                 inop->inode.iso_mode |= VREAD >> 3;
 365                         if (!(ap->perm[1]&0x40))
 366                                 inop->inode.iso_mode |= VEXEC;
 367                         if (!(ap->perm[1]&0x10))
 368                                 inop->inode.iso_mode |= VREAD;
 369                         inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */
 370                         inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */
 371                 } else
 372                         ap = NULL;
 373         }
 374         if (!ap) {
 375                 inop->inode.iso_mode |= VREAD|VEXEC|(VREAD|VEXEC)>>3|(VREAD|VEXEC)>>6;
 376                 inop->inode.iso_uid = (uid_t)0;
 377                 inop->inode.iso_gid = (gid_t)0;
 378         }
 379         if (bp2)
 380                 brelse(bp2);
 381 }
 382
 383 /*
 384  * Time stamps
 385  */
 386 void
 387 cd9660_deftstamp(isodir,inop,bp)
 388         struct iso_directory_record *isodir;
 389         struct iso_node *inop;
 390         struct buf *bp;
 391 {
 392         struct buf *bp2 = NULL;
 393         struct iso_mnt *imp;
 394         struct iso_extended_attributes *ap = NULL;
 395         int off;
 396
 397         if (!bp
 398             && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
 399             && (off = isonum_711(isodir->ext_attr_length)))
 400         {
 401                 VOP_BLKATOFF(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL, &bp2);
 402                 bp = bp2;
 403         }
 404         if (bp) {
 405                 ap = (struct iso_extended_attributes *)bp->b_data;
 406
 407                 if (isonum_711(ap->version) == 1) {
 408                         if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime))
 409                                 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime);
 410                         if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime))
 411                                 inop->inode.iso_ctime = inop->inode.iso_atime;
 412                         if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime))
 413                                 inop->inode.iso_mtime = inop->inode.iso_ctime;
 414                 } else
 415                         ap = NULL;
 416         }
 417         if (!ap) {
 418                 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime);
 419                 inop->inode.iso_atime = inop->inode.iso_ctime;
 420                 inop->inode.iso_mtime = inop->inode.iso_ctime;
 421         }
 422         if (bp2)
 423                 brelse(bp2);
 424 }
 425
 426 int
 427 cd9660_tstamp_conv7(pi,pu)
 428         u_char *pi;
 429         struct timespec *pu;
 430 {
 431         int crtime, days;
 432         int y, m, d, hour, minute, second, tz;
 433
 434         y = pi[0] + 1900;
 435         m = pi[1];
 436         d = pi[2];
 437         hour = pi[3];
 438         minute = pi[4];
 439         second = pi[5];
 440         tz = pi[6];
 441
 442         if (y < 1970) {
 443                 pu->tv_sec  = 0;
 444                 pu->tv_nsec = 0;
 445                 return 0;
 446         } else {
 447 #ifdef  ORIGINAL
 448                 /* computes day number relative to Sept. 19th,1989 */
 449                 /* don't even *THINK* about changing formula. It works! */
 450                 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100;
 451 #else
 452                 /*
 453                  * Changed :-) to make it relative to Jan. 1st, 1970
 454                  * and to disambiguate negative division
 455                  */
 456                 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239;
 457 #endif
 458                 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second;
 459
 460                 /* timezone offset is unreliable on some disks */
 461                 if (-48 <= tz && tz <= 52)
 462                         crtime -= tz * 15 * 60;
 463         }
 464         pu->tv_sec  = crtime;
 465         pu->tv_nsec = 0;
 466         return 1;
 467 }
 468
 469 static u_int
 470 cd9660_chars2ui(begin,len)
 471         u_char *begin;
 472         int len;
 473 {
 474         u_int rc;
 475
 476         for (rc = 0; --len >= 0;) {
 477                 rc *= 10;
 478                 rc += *begin++ - '0';
 479         }
 480         return rc;
 481 }
 482
 483 int
 484 cd9660_tstamp_conv17(pi,pu)
 485         u_char *pi;
 486         struct timespec *pu;
 487 {
 488         u_char buf[7];
 489
 490         /* year:"0001"-"9999" -> -1900  */
 491         buf[0] = cd9660_chars2ui(pi,4) - 1900;
 492
 493         /* month: " 1"-"12"      -> 1 - 12 */
 494         buf[1] = cd9660_chars2ui(pi + 4,2);
 495
 496         /* day:   " 1"-"31"      -> 1 - 31 */
 497         buf[2] = cd9660_chars2ui(pi + 6,2);
 498
 499         /* hour:  " 0"-"23"      -> 0 - 23 */
 500         buf[3] = cd9660_chars2ui(pi + 8,2);
 501
 502         /* minute:" 0"-"59"      -> 0 - 59 */
 503         buf[4] = cd9660_chars2ui(pi + 10,2);
 504
 505         /* second:" 0"-"59"      -> 0 - 59 */
 506         buf[5] = cd9660_chars2ui(pi + 12,2);
 507
 508         /* difference of GMT */
 509         buf[6] = pi[16];
 510
 511         return cd9660_tstamp_conv7(buf,pu);
 512 }
 513
 514 ino_t
 515 isodirino(isodir, imp)
 516         struct iso_directory_record *isodir;
 517         struct iso_mnt *imp;
 518 {
 519         ino_t ino;
 520
 521         ino = (isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length))
 522               << imp->im_bshift;
 523         return (ino);
 524 }