The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/fs/cd9660/cd9660_node.c

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    1 /*      $NetBSD: cd9660_node.c,v 1.6 2004/03/27 04:43:43 atatat 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 1.6 2004/03/27 04:43:43 atatat 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 struct simplelock cd9660_ihash_slock;
   68 
   69 #ifdef ISODEVMAP
   70 LIST_HEAD(idvhashhead, iso_dnode) *idvhashtbl;
   71 u_long idvhash;
   72 #define DNOHASH(device, inum)   (((device) + ((inum)>>12)) & idvhash)
   73 #endif
   74 
   75 extern int prtactive;   /* 1 => print out reclaim of active vnodes */
   76 
   77 struct pool cd9660_node_pool;
   78 
   79 static u_int cd9660_chars2ui __P((u_char *, int));
   80 
   81 /*
   82  * Initialize hash links for inodes and dnodes.
   83  */
   84 void
   85 cd9660_init()
   86 {
   87 #ifdef _LKM
   88         malloc_type_attach(M_ISOFSMNT);
   89 #endif
   90         isohashtbl = hashinit(desiredvnodes, HASH_LIST, M_ISOFSMNT, M_WAITOK,
   91             &isohash);
   92         simple_lock_init(&cd9660_ihash_slock);
   93 #ifdef ISODEVMAP
   94         idvhashtbl = hashinit(desiredvnodes / 8, HASH_LIST, M_ISOFSMNT,
   95             M_WAITOK, &idvhash);
   96 #endif
   97         pool_init(&cd9660_node_pool, sizeof(struct iso_node), 0, 0, 0,
   98             "cd9660nopl", &pool_allocator_nointr);
   99 }
  100 
  101 /*
  102  * Reinitialize inode hash table.
  103  */
  104 
  105 void
  106 cd9660_reinit()
  107 {
  108         struct iso_node *ip;
  109         struct ihashhead *oldhash1, *hash1;
  110         u_long oldmask1, mask1, val;
  111 #ifdef ISODEVMAP
  112         struct iso_dnode *dp;
  113         struct idvhashhead *oldhash2, *hash2;
  114         u_long oldmask2, mask2;
  115 #endif
  116         u_int i;
  117 
  118         hash1 = hashinit(desiredvnodes, HASH_LIST, M_ISOFSMNT, M_WAITOK,
  119             &mask1);
  120 #ifdef ISODEVMAP
  121         hash2 = hashinit(desiredvnodes / 8, HASH_LIST, M_ISOFSMNT, M_WAITOK,
  122             &mask2);
  123 #endif
  124 
  125         simple_lock(&cd9660_ihash_slock);
  126         oldhash1 = isohashtbl;
  127         oldmask1 = isohash;
  128         isohashtbl = hash1;
  129         isohash = mask1;
  130 #ifdef ISODEVMAP
  131         oldhash2 = idvhashtbl;
  132         oldmask2 = idvhash;
  133         idvhashtbl = hash2;
  134         idvhash = mask2;
  135         for (i = 0; i <= oldmask2; i++) {
  136                 while ((dp = LIST_FIRST(&oldhash2[i])) != NULL) {
  137                         LIST_REMOVE(dp, d_hash);
  138                         val = DNOHASH(dp->i_dev, dp->i_number);
  139                         LIST_INSERT_HEAD(&hash2[val], dp, d_hash);
  140                 }
  141         }
  142 #endif
  143         for (i = 0; i <= oldmask1; i++) {
  144                 while ((ip = LIST_FIRST(&oldhash1[i])) != NULL) {
  145                         LIST_REMOVE(ip, i_hash);
  146                         val = INOHASH(ip->i_dev, ip->i_number);
  147                         LIST_INSERT_HEAD(&hash1[val], ip, i_hash);
  148                 }
  149         }
  150         simple_unlock(&cd9660_ihash_slock);
  151         hashdone(oldhash1, M_ISOFSMNT);
  152 #ifdef ISODEVMAP
  153         hashdone(oldhash2, M_ISOFSMNT);
  154 #endif
  155 }
  156 
  157 /*
  158  * Destroy node pool and hash table.
  159  */
  160 void
  161 cd9660_done()
  162 {
  163         hashdone(isohashtbl, M_ISOFSMNT);
  164 #ifdef ISODEVMAP
  165         hashdone(idvhashtbl, M_ISOFSMNT);
  166 #endif
  167         pool_destroy(&cd9660_node_pool);
  168 #ifdef _LKM
  169         malloc_type_detach(M_ISOFSMNT);
  170 #endif
  171 }
  172 
  173 #ifdef ISODEVMAP
  174 /*
  175  * Enter a new node into the device hash list
  176  */
  177 struct iso_dnode *
  178 iso_dmap(device, inum, create)
  179         dev_t   device;
  180         ino_t   inum;
  181         int     create;
  182 {
  183         struct iso_dnode *dp;
  184         struct idvhashhead *hp;
  185 
  186         hp = &idvhashtbl[DNOHASH(device, inum)];
  187         LIST_FOREACH(dp, hp, d_hash) {
  188                 if (inum == dp->i_number && device == dp->i_dev)
  189                         return (dp);
  190         }
  191 
  192         if (!create)
  193                 return (NULL);
  194 
  195         MALLOC(dp, struct iso_dnode *, sizeof(struct iso_dnode), M_CACHE,
  196                M_WAITOK);
  197         dp->i_dev = device;
  198         dp->i_number = inum;
  199         LIST_INSERT_HEAD(hp, dp, d_hash);
  200         return (dp);
  201 }
  202 
  203 void
  204 iso_dunmap(device)
  205         dev_t device;
  206 {
  207         struct idvhashhead *dpp;
  208         struct iso_dnode *dp, *dq;
  209         
  210         for (dpp = idvhashtbl; dpp <= idvhashtbl + idvhash; dpp++) {
  211                 for (dp = LIST_FIRST(dpp); dp != NULL; dp = dq) {
  212                         dq = LIST_NEXT(dp, d_hash);
  213                         if (device == dp->i_dev) {
  214                                 LIST_REMOVE(dp, d_hash);
  215                                 FREE(dp, M_CACHE);
  216                         }
  217                 }
  218         }
  219 }
  220 #endif
  221 
  222 /*
  223  * Use the device/inum pair to find the incore inode, and return a pointer
  224  * to it. If it is in core, but locked, wait for it.
  225  */
  226 struct vnode *
  227 cd9660_ihashget(dev, inum)
  228         dev_t dev;
  229         ino_t inum;
  230 {
  231         struct iso_node *ip;
  232         struct vnode *vp;
  233 
  234 loop:
  235         simple_lock(&cd9660_ihash_slock);
  236         LIST_FOREACH(ip, &isohashtbl[INOHASH(dev, inum)], i_hash) {
  237                 if (inum == ip->i_number && dev == ip->i_dev) {
  238                         vp = ITOV(ip);
  239                         simple_lock(&vp->v_interlock);
  240                         simple_unlock(&cd9660_ihash_slock);
  241                         if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK))
  242                                 goto loop;
  243                         return (vp);
  244                 }
  245         }
  246         simple_unlock(&cd9660_ihash_slock);
  247         return (NULL);
  248 }
  249 
  250 /*
  251  * Insert the inode into the hash table, and return it locked.
  252  *
  253  * ip->i_vnode must be initialized first.
  254  */
  255 void
  256 cd9660_ihashins(ip)
  257         struct iso_node *ip;
  258 {
  259         struct ihashhead *ipp;
  260 
  261         simple_lock(&cd9660_ihash_slock);
  262         ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)];
  263         LIST_INSERT_HEAD(ipp, ip, i_hash);
  264         simple_unlock(&cd9660_ihash_slock);
  265 
  266         lockmgr(&ip->i_vnode->v_lock, LK_EXCLUSIVE, &ip->i_vnode->v_interlock);
  267 }
  268 
  269 /*
  270  * Remove the inode from the hash table.
  271  */
  272 void
  273 cd9660_ihashrem(ip)
  274         struct iso_node *ip;
  275 {
  276         simple_lock(&cd9660_ihash_slock);
  277         LIST_REMOVE(ip, i_hash);
  278         simple_unlock(&cd9660_ihash_slock);
  279 }
  280 
  281 /*
  282  * Last reference to an inode, write the inode out and if necessary,
  283  * truncate and deallocate the file.
  284  */
  285 int
  286 cd9660_inactive(v)
  287         void *v;
  288 {
  289         struct vop_inactive_args /* {
  290                 struct vnode *a_vp;
  291                 struct proc *a_p;
  292         } */ *ap = v;
  293         struct vnode *vp = ap->a_vp;
  294         struct proc *p = ap->a_p;
  295         struct iso_node *ip = VTOI(vp);
  296         int error = 0;
  297         
  298         if (prtactive && vp->v_usecount != 0)
  299                 vprint("cd9660_inactive: pushing active", vp);
  300         
  301         ip->i_flag = 0;
  302         VOP_UNLOCK(vp, 0);
  303         /*
  304          * If we are done with the inode, reclaim it
  305          * so that it can be reused immediately.
  306          */
  307         if (ip->inode.iso_mode == 0)
  308                 vrecycle(vp, (struct simplelock *)0, p);
  309         return error;
  310 }
  311 
  312 /*
  313  * Reclaim an inode so that it can be used for other purposes.
  314  */
  315 int
  316 cd9660_reclaim(v)
  317         void *v;
  318 {
  319         struct vop_reclaim_args /* {
  320                 struct vnode *a_vp;
  321                 struct proc *a_p;
  322         } */ *ap = v;
  323         struct vnode *vp = ap->a_vp;
  324         struct iso_node *ip = VTOI(vp);
  325         
  326         if (prtactive && vp->v_usecount != 0)
  327                 vprint("cd9660_reclaim: pushing active", vp);
  328         /*
  329          * Remove the inode from its hash chain.
  330          */
  331         cd9660_ihashrem(ip);
  332         /*
  333          * Purge old data structures associated with the inode.
  334          */
  335         cache_purge(vp);
  336         if (ip->i_devvp) {
  337                 vrele(ip->i_devvp);
  338                 ip->i_devvp = 0;
  339         }
  340         pool_put(&cd9660_node_pool, vp->v_data);
  341         vp->v_data = NULL;
  342         return (0);
  343 }
  344 
  345 /*
  346  * File attributes
  347  */
  348 void
  349 cd9660_defattr(isodir, inop, bp)
  350         struct iso_directory_record *isodir;
  351         struct iso_node *inop;
  352         struct buf *bp;
  353 {
  354         struct buf *bp2 = NULL;
  355         struct iso_mnt *imp;
  356         struct iso_extended_attributes *ap = NULL;
  357         int off;
  358         
  359         if (isonum_711(isodir->flags)&2) {
  360                 inop->inode.iso_mode = S_IFDIR;
  361                 /*
  362                  * If we return 2, fts() will assume there are no subdirectories
  363                  * (just links for the path and .), so instead we return 1.
  364                  */
  365                 inop->inode.iso_links = 1;
  366         } else {
  367                 inop->inode.iso_mode = S_IFREG;
  368                 inop->inode.iso_links = 1;
  369         }
  370         if (!bp
  371             && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
  372             && (off = isonum_711(isodir->ext_attr_length))) {
  373                 VOP_BLKATOFF(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
  374                              &bp2);
  375                 bp = bp2;
  376         }
  377         if (bp) {
  378                 ap = (struct iso_extended_attributes *)bp->b_data;
  379                 
  380                 if (isonum_711(ap->version) == 1) {
  381                         if (!(ap->perm[1]&0x10))
  382                                 inop->inode.iso_mode |= S_IRUSR;
  383                         if (!(ap->perm[1]&0x40))
  384                                 inop->inode.iso_mode |= S_IXUSR;
  385                         if (!(ap->perm[0]&0x01))
  386                                 inop->inode.iso_mode |= S_IRGRP;
  387                         if (!(ap->perm[0]&0x04))
  388                                 inop->inode.iso_mode |= S_IXGRP;
  389                         if (!(ap->perm[0]&0x10))
  390                                 inop->inode.iso_mode |= S_IROTH;
  391                         if (!(ap->perm[0]&0x40))
  392                                 inop->inode.iso_mode |= S_IXOTH;
  393                         inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */
  394                         inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */
  395                 } else
  396                         ap = NULL;
  397         }
  398         if (!ap) {
  399                 inop->inode.iso_mode |=
  400                     S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
  401                 inop->inode.iso_uid = (uid_t)0;
  402                 inop->inode.iso_gid = (gid_t)0;
  403         }
  404         if (bp2)
  405                 brelse(bp2);
  406 }
  407 
  408 /*
  409  * Time stamps
  410  */
  411 void
  412 cd9660_deftstamp(isodir,inop,bp)
  413         struct iso_directory_record *isodir;
  414         struct iso_node *inop;
  415         struct buf *bp;
  416 {
  417         struct buf *bp2 = NULL;
  418         struct iso_mnt *imp;
  419         struct iso_extended_attributes *ap = NULL;
  420         int off;
  421         
  422         if (!bp
  423             && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
  424             && (off = isonum_711(isodir->ext_attr_length))) {
  425                 VOP_BLKATOFF(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
  426                              &bp2);
  427                 bp = bp2;
  428         }
  429         if (bp) {
  430                 ap = (struct iso_extended_attributes *)bp->b_data;
  431                 
  432                 if (isonum_711(ap->version) == 1) {
  433                         if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime))
  434                                 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime);
  435                         if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime))
  436                                 inop->inode.iso_ctime = inop->inode.iso_atime;
  437                         if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime))
  438                                 inop->inode.iso_mtime = inop->inode.iso_ctime;
  439                 } else
  440                         ap = NULL;
  441         }
  442         if (!ap) {
  443                 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime);
  444                 inop->inode.iso_atime = inop->inode.iso_ctime;
  445                 inop->inode.iso_mtime = inop->inode.iso_ctime;
  446         }
  447         if (bp2)
  448                 brelse(bp2);
  449 }
  450 
  451 int
  452 cd9660_tstamp_conv7(pi,pu)
  453         u_char *pi;
  454         struct timespec *pu;
  455 {
  456         int crtime, days;
  457         int y, m, d, hour, minute, second, tz;
  458         
  459         y = pi[0] + 1900;
  460         m = pi[1];
  461         d = pi[2];
  462         hour = pi[3];
  463         minute = pi[4];
  464         second = pi[5];
  465         tz = pi[6];
  466         
  467         if (y < 1970) {
  468                 pu->tv_sec  = 0;
  469                 pu->tv_nsec = 0;
  470                 return 0;
  471         } else {
  472 #ifdef  ORIGINAL
  473                 /* computes day number relative to Sept. 19th,1989 */
  474                 /* don't even *THINK* about changing formula. It works! */
  475                 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100;
  476 #else
  477                 /*
  478                  * Changed :-) to make it relative to Jan. 1st, 1970
  479                  * and to disambiguate negative division
  480                  */
  481                 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239;
  482 #endif
  483                 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second;
  484                 
  485                 /* timezone offset is unreliable on some disks */
  486                 if (-48 <= tz && tz <= 52)
  487                         crtime -= tz * 15 * 60;
  488         }
  489         pu->tv_sec  = crtime;
  490         pu->tv_nsec = 0;
  491         return 1;
  492 }
  493 
  494 static u_int
  495 cd9660_chars2ui(begin,len)
  496         u_char *begin;
  497         int len;
  498 {
  499         u_int rc;
  500         
  501         for (rc = 0; --len >= 0;) {
  502                 rc *= 10;
  503                 rc += *begin++ - '';
  504         }
  505         return rc;
  506 }
  507 
  508 int
  509 cd9660_tstamp_conv17(pi,pu)
  510         u_char *pi;
  511         struct timespec *pu;
  512 {
  513         u_char buf[7];
  514         
  515         /* year:"0001"-"9999" -> -1900  */
  516         buf[0] = cd9660_chars2ui(pi,4) - 1900;
  517         
  518         /* month: " 1"-"12"      -> 1 - 12 */
  519         buf[1] = cd9660_chars2ui(pi + 4,2);
  520         
  521         /* day:   " 1"-"31"      -> 1 - 31 */
  522         buf[2] = cd9660_chars2ui(pi + 6,2);
  523         
  524         /* hour:  " 0"-"23"      -> 0 - 23 */
  525         buf[3] = cd9660_chars2ui(pi + 8,2);
  526         
  527         /* minute:" 0"-"59"      -> 0 - 59 */
  528         buf[4] = cd9660_chars2ui(pi + 10,2);
  529         
  530         /* second:" 0"-"59"      -> 0 - 59 */
  531         buf[5] = cd9660_chars2ui(pi + 12,2);
  532         
  533         /* difference of GMT */
  534         buf[6] = pi[16];
  535         
  536         return cd9660_tstamp_conv7(buf,pu);
  537 }
  538 
  539 ino_t
  540 isodirino(isodir, imp)
  541         struct iso_directory_record *isodir;
  542         struct iso_mnt *imp;
  543 {
  544         ino_t ino;
  545 
  546         ino = (isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length))
  547               << imp->im_bshift;
  548         return (ino);
  549 }

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