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                 struct thread *a_td;
   67         } */ *ap;
   68 {
   69         struct vnode *vp = ap->a_vp;
   70         struct iso_node *ip = VTOI(vp);
   71         int error = 0;
   72 
   73         /*
   74          * If we are done with the inode, reclaim it
   75          * so that it can be reused immediately.
   76          */
   77         if (ip->inode.iso_mode == 0)
   78                 vrecycle(vp);
   79         return error;
   80 }
   81 
   82 /*
   83  * Reclaim an inode so that it can be used for other purposes.
   84  */
   85 int
   86 cd9660_reclaim(ap)
   87         struct vop_reclaim_args /* {
   88                 struct vnode *a_vp;
   89                 struct thread *a_td;
   90         } */ *ap;
   91 {
   92         struct vnode *vp = ap->a_vp;
   93 
   94         /*
   95          * Destroy the vm object and flush associated pages.
   96          */
   97         vnode_destroy_vobject(vp);
   98         /*
   99          * Remove the inode from its hash chain.
  100          */
  101         vfs_hash_remove(vp);
  102 
  103         /*
  104          * Purge old data structures associated with the inode.
  105          */
  106         free(vp->v_data, M_ISOFSNODE);
  107         vp->v_data = NULL;
  108         return (0);
  109 }
  110 
  111 /*
  112  * File attributes
  113  */
  114 void
  115 cd9660_defattr(isodir, inop, bp, ftype)
  116         struct iso_directory_record *isodir;
  117         struct iso_node *inop;
  118         struct buf *bp;
  119         enum ISO_FTYPE ftype;
  120 {
  121         struct buf *bp2 = NULL;
  122         struct iso_mnt *imp;
  123         struct iso_extended_attributes *ap = NULL;
  124         int off;
  125 
  126         /* high sierra does not have timezone data, flag is one byte ahead */
  127         if (isonum_711(ftype == ISO_FTYPE_HIGH_SIERRA?
  128                        &isodir->date[6]: isodir->flags)&2) {
  129                 inop->inode.iso_mode = S_IFDIR;
  130                 /*
  131                  * If we return 2, fts() will assume there are no subdirectories
  132                  * (just links for the path and .), so instead we return 1.
  133                  */
  134                 inop->inode.iso_links = 1;
  135         } else {
  136                 inop->inode.iso_mode = S_IFREG;
  137                 inop->inode.iso_links = 1;
  138         }
  139         if (!bp
  140             && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
  141             && (off = isonum_711(isodir->ext_attr_length))) {
  142                 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
  143                              &bp2);
  144                 bp = bp2;
  145         }
  146         if (bp) {
  147                 ap = (struct iso_extended_attributes *)bp->b_data;
  148 
  149                 if (isonum_711(ap->version) == 1) {
  150                         if (!(ap->perm[0]&0x40))
  151                                 inop->inode.iso_mode |= S_IXOTH;
  152                         if (!(ap->perm[0]&0x10))
  153                                 inop->inode.iso_mode |= S_IROTH;
  154                         if (!(ap->perm[0]&4))
  155                                 inop->inode.iso_mode |= S_IXGRP;
  156                         if (!(ap->perm[0]&1))
  157                                 inop->inode.iso_mode |= S_IRGRP;
  158                         if (!(ap->perm[1]&0x40))
  159                                 inop->inode.iso_mode |= S_IXUSR;
  160                         if (!(ap->perm[1]&0x10))
  161                                 inop->inode.iso_mode |= S_IRUSR;
  162                         inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */
  163                         inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */
  164                 } else
  165                         ap = NULL;
  166         }
  167         if (!ap) {
  168                 inop->inode.iso_mode |= S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
  169                 inop->inode.iso_uid = (uid_t)0;
  170                 inop->inode.iso_gid = (gid_t)0;
  171         }
  172         if (bp2)
  173                 brelse(bp2);
  174 }
  175 
  176 /*
  177  * Time stamps
  178  */
  179 void
  180 cd9660_deftstamp(isodir,inop,bp,ftype)
  181         struct iso_directory_record *isodir;
  182         struct iso_node *inop;
  183         struct buf *bp;
  184         enum ISO_FTYPE ftype;
  185 {
  186         struct buf *bp2 = NULL;
  187         struct iso_mnt *imp;
  188         struct iso_extended_attributes *ap = NULL;
  189         int off;
  190 
  191         if (!bp
  192             && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
  193             && (off = isonum_711(isodir->ext_attr_length))) {
  194                 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
  195                              &bp2);
  196                 bp = bp2;
  197         }
  198         if (bp) {
  199                 ap = (struct iso_extended_attributes *)bp->b_data;
  200 
  201                 if (ftype != ISO_FTYPE_HIGH_SIERRA
  202                     && isonum_711(ap->version) == 1) {
  203                         if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime))
  204                                 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime);
  205                         if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime))
  206                                 inop->inode.iso_ctime = inop->inode.iso_atime;
  207                         if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime))
  208                                 inop->inode.iso_mtime = inop->inode.iso_ctime;
  209                 } else
  210                         ap = NULL;
  211         }
  212         if (!ap) {
  213                 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime,ftype);
  214                 inop->inode.iso_atime = inop->inode.iso_ctime;
  215                 inop->inode.iso_mtime = inop->inode.iso_ctime;
  216         }
  217         if (bp2)
  218                 brelse(bp2);
  219 }
  220 
  221 int
  222 cd9660_tstamp_conv7(pi,pu,ftype)
  223         u_char *pi;
  224         struct timespec *pu;
  225         enum ISO_FTYPE ftype;
  226 {
  227         int crtime, days;
  228         int y, m, d, hour, minute, second, tz;
  229 
  230         y = pi[0] + 1900;
  231         m = pi[1];
  232         d = pi[2];
  233         hour = pi[3];
  234         minute = pi[4];
  235         second = pi[5];
  236         if(ftype != ISO_FTYPE_HIGH_SIERRA)
  237                 tz = ((signed char *)pi)[6]; /* Timezone value is signed. */
  238         else
  239                 /* original high sierra misses timezone data */
  240                 tz = 0;
  241 
  242         if (y < 1970) {
  243                 pu->tv_sec  = 0;
  244                 pu->tv_nsec = 0;
  245                 return 0;
  246         } else {
  247 #ifdef  ORIGINAL
  248                 /* computes day number relative to Sept. 19th,1989 */
  249                 /* don't even *THINK* about changing formula. It works! */
  250                 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100;
  251 #else
  252                 /*
  253                  * Changed :-) to make it relative to Jan. 1st, 1970
  254                  * and to disambiguate negative division
  255                  */
  256                 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239;
  257 #endif
  258                 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second;
  259 
  260                 /* timezone offset is unreliable on some disks */
  261                 if (-48 <= tz && tz <= 52)
  262                         crtime -= tz * 15 * 60;
  263         }
  264         pu->tv_sec  = crtime;
  265         pu->tv_nsec = 0;
  266         return 1;
  267 }
  268 
  269 static u_int
  270 cd9660_chars2ui(begin,len)
  271         u_char *begin;
  272         int len;
  273 {
  274         u_int rc;
  275 
  276         for (rc = 0; --len >= 0;) {
  277                 rc *= 10;
  278                 rc += *begin++ - '';
  279         }
  280         return rc;
  281 }
  282 
  283 int
  284 cd9660_tstamp_conv17(pi,pu)
  285         u_char *pi;
  286         struct timespec *pu;
  287 {
  288         u_char buf[7];
  289 
  290         /* year:"0001"-"9999" -> -1900  */
  291         buf[0] = cd9660_chars2ui(pi,4) - 1900;
  292 
  293         /* month: " 1"-"12"   -> 1 - 12 */
  294         buf[1] = cd9660_chars2ui(pi + 4,2);
  295 
  296         /* day:   " 1"-"31"   -> 1 - 31 */
  297         buf[2] = cd9660_chars2ui(pi + 6,2);
  298 
  299         /* hour:  " 0"-"23"   -> 0 - 23 */
  300         buf[3] = cd9660_chars2ui(pi + 8,2);
  301 
  302         /* minute:" 0"-"59"   -> 0 - 59 */
  303         buf[4] = cd9660_chars2ui(pi + 10,2);
  304 
  305         /* second:" 0"-"59"   -> 0 - 59 */
  306         buf[5] = cd9660_chars2ui(pi + 12,2);
  307 
  308         /* difference of GMT */
  309         buf[6] = pi[16];
  310 
  311         return cd9660_tstamp_conv7(buf, pu, ISO_FTYPE_DEFAULT);
  312 }
  313 
  314 cd_ino_t
  315 isodirino(isodir, imp)
  316         struct iso_directory_record *isodir;
  317         struct iso_mnt *imp;
  318 {
  319         cd_ino_t ino;
  320 
  321         /*
  322          * Note there is an inverse calculation in
  323          * cd9660_vfsops.c:cd9660_vget_internal():
  324          *   ip->iso_start = ino >> imp->im_bshift;
  325          * and also a calculation of the isodir pointer
  326          * from an inode in cd9660_vnops.c:cd9660_readlink()
  327          */
  328         ino = ((cd_ino_t)isonum_733(isodir->extent) +
  329                 isonum_711(isodir->ext_attr_length)) << imp->im_bshift;
  330         return ino;
  331 }
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FreeBSD/Linux Kernel Cross Reference sys/fs/cd9660/cd9660_node.c

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sys/fs/cd9660/cd9660_node.c
