sys/fs/cd9660/cd9660_node.c

   1 /*      $NetBSD: cd9660_node.c,v 1.23 2008/02/27 19:43:36 matt Exp $    */
   2
   3 /*-
   4  * Copyright (c) 1982, 1986, 1989, 1994
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley
   8  * by Pace Willisson (pace@blitz.com).  The Rock Ridge Extension
   9  * Support code is derived from software contributed to Berkeley
  10  * by Atsushi Murai (amurai@spec.co.jp).
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  * 3. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  *      @(#)cd9660_node.c       8.8 (Berkeley) 5/22/95
  37  */
  38
  39 #include <sys/cdefs.h>
  40 __KERNEL_RCSID(0, "$NetBSD: cd9660_node.c,v 1.23 2008/02/27 19:43:36 matt Exp $");
  41
  42 #include <sys/param.h>
  43 #include <sys/systm.h>
  44 #include <sys/mount.h>
  45 #include <sys/proc.h>
  46 #include <sys/file.h>
  47 #include <sys/buf.h>
  48 #include <sys/vnode.h>
  49 #include <sys/namei.h>
  50 #include <sys/kernel.h>
  51 #include <sys/malloc.h>
  52 #include <sys/pool.h>
  53 #include <sys/stat.h>
  54
  55 #include <fs/cd9660/iso.h>
  56 #include <fs/cd9660/cd9660_extern.h>
  57 #include <fs/cd9660/cd9660_node.h>
  58 #include <fs/cd9660/cd9660_mount.h>
  59 #include <fs/cd9660/iso_rrip.h>
  60
  61 /*
  62  * Structures associated with iso_node caching.
  63  */
  64 LIST_HEAD(ihashhead, iso_node) *isohashtbl;
  65 u_long isohash;
  66 #define INOHASH(device, inum)   (((device) + ((inum)>>12)) & isohash)
  67 kmutex_t cd9660_ihash_lock;
  68 kmutex_t cd9660_hashlock;
  69
  70 extern int prtactive;   /* 1 => print out reclaim of active vnodes */
  71
  72 struct pool cd9660_node_pool;
  73
  74 static u_int cd9660_chars2ui(const u_char *, int);
  75
  76 /*
  77  * Initialize hash links for inodes and dnodes.
  78  */
  79 void
  80 cd9660_init(void)
  81 {
  82
  83         malloc_type_attach(M_ISOFSMNT);
  84         pool_init(&cd9660_node_pool, sizeof(struct iso_node), 0, 0, 0,
  85             "cd9660nopl", &pool_allocator_nointr, IPL_NONE);
  86         isohashtbl = hashinit(desiredvnodes, HASH_LIST, true, &isohash);
  87         mutex_init(&cd9660_ihash_lock, MUTEX_DEFAULT, IPL_NONE);
  88         mutex_init(&cd9660_hashlock, MUTEX_DEFAULT, IPL_NONE);
  89 }
  90
  91 /*
  92  * Reinitialize inode hash table.
  93  */
  94
  95 void
  96 cd9660_reinit(void)
  97 {
  98         struct iso_node *ip;
  99         struct ihashhead *oldhash1, *hash1;
 100         u_long oldmask1, mask1, val;
 101         u_int i;
 102
 103         hash1 = hashinit(desiredvnodes, HASH_LIST, true, &mask1);
 104
 105         mutex_enter(&cd9660_ihash_lock);
 106         oldhash1 = isohashtbl;
 107         oldmask1 = isohash;
 108         isohashtbl = hash1;
 109         isohash = mask1;
 110         for (i = 0; i <= oldmask1; i++) {
 111                 while ((ip = LIST_FIRST(&oldhash1[i])) != NULL) {
 112                         LIST_REMOVE(ip, i_hash);
 113                         val = INOHASH(ip->i_dev, ip->i_number);
 114                         LIST_INSERT_HEAD(&hash1[val], ip, i_hash);
 115                 }
 116         }
 117         mutex_exit(&cd9660_ihash_lock);
 118         hashdone(oldhash1, HASH_LIST, oldmask1);
 119 }
 120
 121 /*
 122  * Destroy node pool and hash table.
 123  */
 124 void
 125 cd9660_done(void)
 126 {
 127         hashdone(isohashtbl, HASH_LIST, isohash);
 128         pool_destroy(&cd9660_node_pool);
 129         mutex_destroy(&cd9660_ihash_lock);
 130         mutex_destroy(&cd9660_hashlock);
 131         malloc_type_detach(M_ISOFSMNT);
 132 }
 133
 134 /*
 135  * Use the device/inum pair to find the incore inode, and return a pointer
 136  * to it. If it is in core, but locked, wait for it.
 137  */
 138 struct vnode *
 139 cd9660_ihashget(dev_t dev, ino_t inum, int flags)
 140 {
 141         struct iso_node *ip;
 142         struct vnode *vp;
 143
 144 loop:
 145         mutex_enter(&cd9660_ihash_lock);
 146         LIST_FOREACH(ip, &isohashtbl[INOHASH(dev, inum)], i_hash) {
 147                 if (inum == ip->i_number && dev == ip->i_dev) {
 148                         vp = ITOV(ip);
 149                         if (flags == 0) {
 150                                 mutex_exit(&cd9660_ihash_lock);
 151                         } else {
 152                                 mutex_enter(&vp->v_interlock);
 153                                 mutex_exit(&cd9660_ihash_lock);
 154                                 if (vget(vp, flags | LK_INTERLOCK))
 155                                         goto loop;
 156                         }
 157                         return (vp);
 158                 }
 159         }
 160         mutex_exit(&cd9660_ihash_lock);
 161         return (NULL);
 162 }
 163
 164 /*
 165  * Insert the inode into the hash table, and return it locked.
 166  *
 167  * ip->i_vnode must be initialized first.
 168  */
 169 void
 170 cd9660_ihashins(struct iso_node *ip)
 171 {
 172         struct ihashhead *ipp;
 173
 174         KASSERT(mutex_owned(&cd9660_hashlock));
 175
 176         mutex_enter(&cd9660_ihash_lock);
 177         ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)];
 178         LIST_INSERT_HEAD(ipp, ip, i_hash);
 179         mutex_exit(&cd9660_ihash_lock);
 180
 181         vlockmgr(&ip->i_vnode->v_lock, LK_EXCLUSIVE);
 182 }
 183
 184 /*
 185  * Remove the inode from the hash table.
 186  */
 187 void
 188 cd9660_ihashrem(struct iso_node *ip)
 189 {
 190         mutex_enter(&cd9660_ihash_lock);
 191         LIST_REMOVE(ip, i_hash);
 192         mutex_exit(&cd9660_ihash_lock);
 193 }
 194
 195 /*
 196  * Last reference to an inode, write the inode out and if necessary,
 197  * truncate and deallocate the file.
 198  */
 199 int
 200 cd9660_inactive(void *v)
 201 {
 202         struct vop_inactive_args /* {
 203                 struct vnode *a_vp;
 204                 bool *a_recycle;
 205         } */ *ap = v;
 206         struct vnode *vp = ap->a_vp;
 207         struct iso_node *ip = VTOI(vp);
 208         int error = 0;
 209
 210         /*
 211          * If we are done with the inode, reclaim it
 212          * so that it can be reused immediately.
 213          */
 214         ip->i_flag = 0;
 215         *ap->a_recycle = (ip->inode.iso_mode == 0);
 216         VOP_UNLOCK(vp, 0);
 217         return error;
 218 }
 219
 220 /*
 221  * Reclaim an inode so that it can be used for other purposes.
 222  */
 223 int
 224 cd9660_reclaim(void *v)
 225 {
 226         struct vop_reclaim_args /* {
 227                 struct vnode *a_vp;
 228                 struct lwp *a_l;
 229         } */ *ap = v;
 230         struct vnode *vp = ap->a_vp;
 231         struct iso_node *ip = VTOI(vp);
 232
 233         if (prtactive && vp->v_usecount > 1)
 234                 vprint("cd9660_reclaim: pushing active", vp);
 235         /*
 236          * Remove the inode from its hash chain.
 237          */
 238         cd9660_ihashrem(ip);
 239         /*
 240          * Purge old data structures associated with the inode.
 241          */
 242         cache_purge(vp);
 243         if (ip->i_devvp) {
 244                 vrele(ip->i_devvp);
 245                 ip->i_devvp = 0;
 246         }
 247         genfs_node_destroy(vp);
 248         pool_put(&cd9660_node_pool, vp->v_data);
 249         vp->v_data = NULL;
 250         return (0);
 251 }
 252
 253 /*
 254  * File attributes
 255  */
 256 void
 257 cd9660_defattr(struct iso_directory_record *isodir, struct iso_node *inop,
 258         struct buf *bp)
 259 {
 260         struct buf *bp2 = NULL;
 261         struct iso_mnt *imp;
 262         struct iso_extended_attributes *ap = NULL;
 263         int off;
 264
 265         if (isonum_711(isodir->flags)&2) {
 266                 inop->inode.iso_mode = S_IFDIR;
 267                 /*
 268                  * If we return 2, fts() will assume there are no subdirectories
 269                  * (just links for the path and .), so instead we return 1.
 270                  */
 271                 inop->inode.iso_links = 1;
 272         } else {
 273                 inop->inode.iso_mode = S_IFREG;
 274                 inop->inode.iso_links = 1;
 275         }
 276         if (!bp
 277             && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
 278             && (off = isonum_711(isodir->ext_attr_length))) {
 279                 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift),
 280                     NULL, &bp2);
 281                 bp = bp2;
 282         }
 283         if (bp) {
 284                 ap = (struct iso_extended_attributes *)bp->b_data;
 285
 286                 if (isonum_711(ap->version) == 1) {
 287                         if (!(ap->perm[1]&0x10))
 288                                 inop->inode.iso_mode |= S_IRUSR;
 289                         if (!(ap->perm[1]&0x40))
 290                                 inop->inode.iso_mode |= S_IXUSR;
 291                         if (!(ap->perm[0]&0x01))
 292                                 inop->inode.iso_mode |= S_IRGRP;
 293                         if (!(ap->perm[0]&0x04))
 294                                 inop->inode.iso_mode |= S_IXGRP;
 295                         if (!(ap->perm[0]&0x10))
 296                                 inop->inode.iso_mode |= S_IROTH;
 297                         if (!(ap->perm[0]&0x40))
 298                                 inop->inode.iso_mode |= S_IXOTH;
 299                         inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */
 300                         inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */
 301                 } else
 302                         ap = NULL;
 303         }
 304         if (!ap) {
 305                 inop->inode.iso_mode |=
 306                     S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
 307                 inop->inode.iso_uid = (uid_t)0;
 308                 inop->inode.iso_gid = (gid_t)0;
 309         }
 310         if (bp2)
 311                 brelse(bp2, 0);
 312 }
 313
 314 /*
 315  * Time stamps
 316  */
 317 void
 318 cd9660_deftstamp(struct iso_directory_record *isodir, struct iso_node *inop,
 319         struct buf *bp)
 320 {
 321         struct buf *bp2 = NULL;
 322         struct iso_mnt *imp;
 323         struct iso_extended_attributes *ap = NULL;
 324         int off;
 325
 326         if (!bp
 327             && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
 328             && (off = isonum_711(isodir->ext_attr_length))) {
 329                 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift),
 330                     NULL, &bp2);
 331                 bp = bp2;
 332         }
 333         if (bp) {
 334                 ap = (struct iso_extended_attributes *)bp->b_data;
 335
 336                 if (isonum_711(ap->version) == 1) {
 337                         if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime))
 338                                 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime);
 339                         if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime))
 340                                 inop->inode.iso_ctime = inop->inode.iso_atime;
 341                         if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime))
 342                                 inop->inode.iso_mtime = inop->inode.iso_ctime;
 343                 } else
 344                         ap = NULL;
 345         }
 346         if (!ap) {
 347                 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime);
 348                 inop->inode.iso_atime = inop->inode.iso_ctime;
 349                 inop->inode.iso_mtime = inop->inode.iso_ctime;
 350         }
 351         if (bp2)
 352                 brelse(bp2, 0);
 353 }
 354
 355 int
 356 cd9660_tstamp_conv7(const u_char *pi, struct timespec *pu)
 357 {
 358         int crtime, days;
 359         int y, m, d, hour, minute, second, tz;
 360
 361         y = pi[0] + 1900;
 362         m = pi[1];
 363         d = pi[2];
 364         hour = pi[3];
 365         minute = pi[4];
 366         second = pi[5];
 367         tz = pi[6];
 368
 369         if (y < 1970) {
 370                 pu->tv_sec  = 0;
 371                 pu->tv_nsec = 0;
 372                 return 0;
 373         } else {
 374 #ifdef  ORIGINAL
 375                 /* computes day number relative to Sept. 19th,1989 */
 376                 /* don't even *THINK* about changing formula. It works! */
 377                 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100;
 378 #else
 379                 /*
 380                  * Changed :-) to make it relative to Jan. 1st, 1970
 381                  * and to disambiguate negative division
 382                  */
 383                 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239;
 384 #endif
 385                 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second;
 386
 387                 /* timezone offset is unreliable on some disks */
 388                 if (-48 <= tz && tz <= 52)
 389                         crtime -= tz * 15 * 60;
 390         }
 391         pu->tv_sec  = crtime;
 392         pu->tv_nsec = 0;
 393         return 1;
 394 }
 395
 396 static u_int
 397 cd9660_chars2ui(const u_char *begin, int len)
 398 {
 399         u_int rc;
 400
 401         for (rc = 0; --len >= 0;) {
 402                 rc *= 10;
 403                 rc += *begin++ - '0';
 404         }
 405         return rc;
 406 }
 407
 408 int
 409 cd9660_tstamp_conv17(const u_char *pi, struct timespec *pu)
 410 {
 411         u_char tbuf[7];
 412
 413         /* year:"0001"-"9999" -> -1900  */
 414         tbuf[0] = cd9660_chars2ui(pi,4) - 1900;
 415
 416         /* month: " 1"-"12"      -> 1 - 12 */
 417         tbuf[1] = cd9660_chars2ui(pi + 4,2);
 418
 419         /* day:   " 1"-"31"      -> 1 - 31 */
 420         tbuf[2] = cd9660_chars2ui(pi + 6,2);
 421
 422         /* hour:  " 0"-"23"      -> 0 - 23 */
 423         tbuf[3] = cd9660_chars2ui(pi + 8,2);
 424
 425         /* minute:" 0"-"59"      -> 0 - 59 */
 426         tbuf[4] = cd9660_chars2ui(pi + 10,2);
 427
 428         /* second:" 0"-"59"      -> 0 - 59 */
 429         tbuf[5] = cd9660_chars2ui(pi + 12,2);
 430
 431         /* difference of GMT */
 432         tbuf[6] = pi[16];
 433
 434         return cd9660_tstamp_conv7(tbuf,pu);
 435 }
 436
 437 ino_t
 438 isodirino(struct iso_directory_record *isodir, struct iso_mnt *imp)
 439 {
 440         ino_t ino;
 441
 442         ino = (isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length))
 443               << imp->im_bshift;
 444         return (ino);
 445 }