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