The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: 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 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1982, 1986, 1989, 1994, 1995
    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       8.2 (Berkeley) 1/23/94
   37  */
   38 
   39 #include <sys/cdefs.h>
   40 __FBSDID("$FreeBSD$");
   41 
   42 #include <sys/param.h>
   43 #include <sys/systm.h>
   44 #include <sys/mount.h>
   45 #include <sys/bio.h>
   46 #include <sys/buf.h>
   47 #include <sys/vnode.h>
   48 #include <sys/malloc.h>
   49 #include <sys/stat.h>
   50 #include <sys/mutex.h>
   51 
   52 #include <fs/cd9660/iso.h>
   53 #include <fs/cd9660/cd9660_node.h>
   54 #include <fs/cd9660/cd9660_mount.h>
   55 
   56 static unsigned cd9660_chars2ui(unsigned char *begin, int len);
   57 
   58 /*
   59  * Last reference to an inode, write the inode out and if necessary,
   60  * truncate and deallocate the file.
   61  */
   62 int
   63 cd9660_inactive(ap)
   64         struct vop_inactive_args /* {
   65                 struct vnode *a_vp;
   66         } */ *ap;
   67 {
   68         struct vnode *vp = ap->a_vp;
   69         struct iso_node *ip = VTOI(vp);
   70         int error = 0;
   71 
   72         /*
   73          * If we are done with the inode, reclaim it
   74          * so that it can be reused immediately.
   75          */
   76         if (ip->inode.iso_mode == 0)
   77                 vrecycle(vp);
   78         return error;
   79 }
   80 
   81 /*
   82  * Reclaim an inode so that it can be used for other purposes.
   83  */
   84 int
   85 cd9660_reclaim(ap)
   86         struct vop_reclaim_args /* {
   87                 struct vnode *a_vp;
   88         } */ *ap;
   89 {
   90         struct vnode *vp = ap->a_vp;
   91 
   92         /*
   93          * Remove the inode from its hash chain.
   94          */
   95         vfs_hash_remove(vp);
   96 
   97         /*
   98          * Purge old data structures associated with the inode.
   99          */
  100         free(vp->v_data, M_ISOFSNODE);
  101         vp->v_data = NULL;
  102         return (0);
  103 }
  104 
  105 /*
  106  * File attributes
  107  */
  108 void
  109 cd9660_defattr(isodir, inop, bp, ftype)
  110         struct iso_directory_record *isodir;
  111         struct iso_node *inop;
  112         struct buf *bp;
  113         enum ISO_FTYPE ftype;
  114 {
  115         struct buf *bp2 = NULL;
  116         struct iso_mnt *imp;
  117         struct iso_extended_attributes *ap = NULL;
  118         int off;
  119 
  120         /* high sierra does not have timezone data, flag is one byte ahead */
  121         if (isonum_711(ftype == ISO_FTYPE_HIGH_SIERRA?
  122                        &isodir->date[6]: isodir->flags)&2) {
  123                 inop->inode.iso_mode = S_IFDIR;
  124                 /*
  125                  * If we return 2, fts() will assume there are no subdirectories
  126                  * (just links for the path and .), so instead we return 1.
  127                  */
  128                 inop->inode.iso_links = 1;
  129         } else {
  130                 inop->inode.iso_mode = S_IFREG;
  131                 inop->inode.iso_links = 1;
  132         }
  133         if (!bp
  134             && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
  135             && (off = isonum_711(isodir->ext_attr_length))) {
  136                 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
  137                              &bp2);
  138                 bp = bp2;
  139         }
  140         if (bp) {
  141                 ap = (struct iso_extended_attributes *)bp->b_data;
  142 
  143                 if (isonum_711(ap->version) == 1) {
  144                         if (!(ap->perm[0]&0x40))
  145                                 inop->inode.iso_mode |= S_IXOTH;
  146                         if (!(ap->perm[0]&0x10))
  147                                 inop->inode.iso_mode |= S_IROTH;
  148                         if (!(ap->perm[0]&4))
  149                                 inop->inode.iso_mode |= S_IXGRP;
  150                         if (!(ap->perm[0]&1))
  151                                 inop->inode.iso_mode |= S_IRGRP;
  152                         if (!(ap->perm[1]&0x40))
  153                                 inop->inode.iso_mode |= S_IXUSR;
  154                         if (!(ap->perm[1]&0x10))
  155                                 inop->inode.iso_mode |= S_IRUSR;
  156                         inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */
  157                         inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */
  158                 } else
  159                         ap = NULL;
  160         }
  161         if (!ap) {
  162                 inop->inode.iso_mode |= S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
  163                 inop->inode.iso_uid = (uid_t)0;
  164                 inop->inode.iso_gid = (gid_t)0;
  165         }
  166         if (bp2)
  167                 brelse(bp2);
  168 }
  169 
  170 /*
  171  * Time stamps
  172  */
  173 void
  174 cd9660_deftstamp(isodir,inop,bp,ftype)
  175         struct iso_directory_record *isodir;
  176         struct iso_node *inop;
  177         struct buf *bp;
  178         enum ISO_FTYPE ftype;
  179 {
  180         struct buf *bp2 = NULL;
  181         struct iso_mnt *imp;
  182         struct iso_extended_attributes *ap = NULL;
  183         int off;
  184 
  185         if (!bp
  186             && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
  187             && (off = isonum_711(isodir->ext_attr_length))) {
  188                 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
  189                              &bp2);
  190                 bp = bp2;
  191         }
  192         if (bp) {
  193                 ap = (struct iso_extended_attributes *)bp->b_data;
  194 
  195                 if (ftype != ISO_FTYPE_HIGH_SIERRA
  196                     && isonum_711(ap->version) == 1) {
  197                         if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime))
  198                                 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime);
  199                         if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime))
  200                                 inop->inode.iso_ctime = inop->inode.iso_atime;
  201                         if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime))
  202                                 inop->inode.iso_mtime = inop->inode.iso_ctime;
  203                 } else
  204                         ap = NULL;
  205         }
  206         if (!ap) {
  207                 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime,ftype);
  208                 inop->inode.iso_atime = inop->inode.iso_ctime;
  209                 inop->inode.iso_mtime = inop->inode.iso_ctime;
  210         }
  211         if (bp2)
  212                 brelse(bp2);
  213 }
  214 
  215 int
  216 cd9660_tstamp_conv7(pi,pu,ftype)
  217         u_char *pi;
  218         struct timespec *pu;
  219         enum ISO_FTYPE ftype;
  220 {
  221         int crtime, days;
  222         int y, m, d, hour, minute, second, tz;
  223 
  224         y = pi[0] + 1900;
  225         m = pi[1];
  226         d = pi[2];
  227         hour = pi[3];
  228         minute = pi[4];
  229         second = pi[5];
  230         if(ftype != ISO_FTYPE_HIGH_SIERRA)
  231                 tz = ((signed char *)pi)[6]; /* Timezone value is signed. */
  232         else
  233                 /* original high sierra misses timezone data */
  234                 tz = 0;
  235 
  236         if (y < 1970) {
  237                 pu->tv_sec  = 0;
  238                 pu->tv_nsec = 0;
  239                 return 0;
  240         } else {
  241 #ifdef  ORIGINAL
  242                 /* computes day number relative to Sept. 19th,1989 */
  243                 /* don't even *THINK* about changing formula. It works! */
  244                 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100;
  245 #else
  246                 /*
  247                  * Changed :-) to make it relative to Jan. 1st, 1970
  248                  * and to disambiguate negative division
  249                  */
  250                 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239;
  251 #endif
  252                 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second;
  253 
  254                 /* timezone offset is unreliable on some disks */
  255                 if (-48 <= tz && tz <= 52)
  256                         crtime -= tz * 15 * 60;
  257         }
  258         pu->tv_sec  = crtime;
  259         pu->tv_nsec = 0;
  260         return 1;
  261 }
  262 
  263 static u_int
  264 cd9660_chars2ui(begin,len)
  265         u_char *begin;
  266         int len;
  267 {
  268         u_int rc;
  269 
  270         for (rc = 0; --len >= 0;) {
  271                 rc *= 10;
  272                 rc += *begin++ - '';
  273         }
  274         return rc;
  275 }
  276 
  277 int
  278 cd9660_tstamp_conv17(pi,pu)
  279         u_char *pi;
  280         struct timespec *pu;
  281 {
  282         u_char buf[7];
  283 
  284         /* year:"0001"-"9999" -> -1900  */
  285         buf[0] = cd9660_chars2ui(pi,4) - 1900;
  286 
  287         /* month: " 1"-"12"   -> 1 - 12 */
  288         buf[1] = cd9660_chars2ui(pi + 4,2);
  289 
  290         /* day:   " 1"-"31"   -> 1 - 31 */
  291         buf[2] = cd9660_chars2ui(pi + 6,2);
  292 
  293         /* hour:  " 0"-"23"   -> 0 - 23 */
  294         buf[3] = cd9660_chars2ui(pi + 8,2);
  295 
  296         /* minute:" 0"-"59"   -> 0 - 59 */
  297         buf[4] = cd9660_chars2ui(pi + 10,2);
  298 
  299         /* second:" 0"-"59"   -> 0 - 59 */
  300         buf[5] = cd9660_chars2ui(pi + 12,2);
  301 
  302         /* difference of GMT */
  303         buf[6] = pi[16];
  304 
  305         return cd9660_tstamp_conv7(buf, pu, ISO_FTYPE_DEFAULT);
  306 }
  307 
  308 cd_ino_t
  309 isodirino(isodir, imp)
  310         struct iso_directory_record *isodir;
  311         struct iso_mnt *imp;
  312 {
  313         cd_ino_t ino;
  314 
  315         /*
  316          * Note there is an inverse calculation in
  317          * cd9660_vfsops.c:cd9660_vget_internal():
  318          *   ip->iso_start = ino >> imp->im_bshift;
  319          * and also a calculation of the isodir pointer
  320          * from an inode in cd9660_vnops.c:cd9660_readlink()
  321          */
  322         ino = ((cd_ino_t)isonum_733(isodir->extent) +
  323                 isonum_711(isodir->ext_attr_length)) << imp->im_bshift;
  324         return ino;
  325 }

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