cd9660_node.c

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    1 /*-
    2  * Copyright (c) 1982, 1986, 1989, 1994, 1995
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * This code is derived from software contributed to Berkeley
    6  * by Pace Willisson (pace@blitz.com).  The Rock Ridge Extension
    7  * Support code is derived from software contributed to Berkeley
    8  * by Atsushi Murai (amurai@spec.co.jp).
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 4. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  *      @(#)cd9660_node.c       8.2 (Berkeley) 1/23/94
   35  */
   36 
   37 #include <sys/cdefs.h>
   38 __FBSDID("$FreeBSD$");
   39 
   40 #include <sys/param.h>
   41 #include <sys/systm.h>
   42 #include <sys/mount.h>
   43 #include <sys/bio.h>
   44 #include <sys/buf.h>
   45 #include <sys/vnode.h>
   46 #include <sys/malloc.h>
   47 #include <sys/stat.h>
   48 #include <sys/mutex.h>
   49 
   50 #include <fs/cd9660/iso.h>
   51 #include <fs/cd9660/cd9660_node.h>
   52 #include <fs/cd9660/cd9660_mount.h>
   53 
   54 static unsigned cd9660_chars2ui(unsigned char *begin, int len);
   55 
   56 /*
   57  * Last reference to an inode, write the inode out and if necessary,
   58  * truncate and deallocate the file.
   59  */
   60 int
   61 cd9660_inactive(ap)
   62         struct vop_inactive_args /* {
   63                 struct vnode *a_vp;
   64                 struct thread *a_td;
   65         } */ *ap;
   66 {
   67         struct vnode *vp = ap->a_vp;
   68         struct thread *td = ap->a_td;
   69         struct iso_node *ip = VTOI(vp);
   70         int error = 0;
   71 
   72         if (prtactive && vrefcnt(vp) != 0)
   73                 vprint("cd9660_inactive: pushing active", vp);
   74 
   75         ip->i_flag = 0;
   76         /*
   77          * If we are done with the inode, reclaim it
   78          * so that it can be reused immediately.
   79          */
   80         if (ip->inode.iso_mode == 0)
   81                 vrecycle(vp, td);
   82         return error;
   83 }
   84 
   85 /*
   86  * Reclaim an inode so that it can be used for other purposes.
   87  */
   88 int
   89 cd9660_reclaim(ap)
   90         struct vop_reclaim_args /* {
   91                 struct vnode *a_vp;
   92                 struct thread *a_td;
   93         } */ *ap;
   94 {
   95         struct vnode *vp = ap->a_vp;
   96 
   97         if (prtactive && vrefcnt(vp) != 0)
   98                 vprint("cd9660_reclaim: pushing active", vp);
   99         /*
  100          * Destroy the vm object and flush associated pages.
  101          */
  102         vnode_destroy_vobject(vp);
  103         /*
  104          * Remove the inode from its hash chain.
  105          */
  106         vfs_hash_remove(vp);
  107 
  108         /*
  109          * Purge old data structures associated with the inode.
  110          */
  111         FREE(vp->v_data, M_ISOFSNODE);
  112         vp->v_data = NULL;
  113         return (0);
  114 }
  115 
  116 /*
  117  * File attributes
  118  */
  119 void
  120 cd9660_defattr(isodir, inop, bp, ftype)
  121         struct iso_directory_record *isodir;
  122         struct iso_node *inop;
  123         struct buf *bp;
  124         enum ISO_FTYPE ftype;
  125 {
  126         struct buf *bp2 = NULL;
  127         struct iso_mnt *imp;
  128         struct iso_extended_attributes *ap = NULL;
  129         int off;
  130 
  131         /* high sierra does not have timezone data, flag is one byte ahead */
  132         if (isonum_711(ftype == ISO_FTYPE_HIGH_SIERRA?
  133                        &isodir->date[6]: isodir->flags)&2) {
  134                 inop->inode.iso_mode = S_IFDIR;
  135                 /*
  136                  * If we return 2, fts() will assume there are no subdirectories
  137                  * (just links for the path and .), so instead we return 1.
  138                  */
  139                 inop->inode.iso_links = 1;
  140         } else {
  141                 inop->inode.iso_mode = S_IFREG;
  142                 inop->inode.iso_links = 1;
  143         }
  144         if (!bp
  145             && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
  146             && (off = isonum_711(isodir->ext_attr_length))) {
  147                 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
  148                              &bp2);
  149                 bp = bp2;
  150         }
  151         if (bp) {
  152                 ap = (struct iso_extended_attributes *)bp->b_data;
  153 
  154                 if (isonum_711(ap->version) == 1) {
  155                         if (!(ap->perm[0]&0x40))
  156                                 inop->inode.iso_mode |= VEXEC >> 6;
  157                         if (!(ap->perm[0]&0x10))
  158                                 inop->inode.iso_mode |= VREAD >> 6;
  159                         if (!(ap->perm[0]&4))
  160                                 inop->inode.iso_mode |= VEXEC >> 3;
  161                         if (!(ap->perm[0]&1))
  162                                 inop->inode.iso_mode |= VREAD >> 3;
  163                         if (!(ap->perm[1]&0x40))
  164                                 inop->inode.iso_mode |= VEXEC;
  165                         if (!(ap->perm[1]&0x10))
  166                                 inop->inode.iso_mode |= VREAD;
  167                         inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */
  168                         inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */
  169                 } else
  170                         ap = NULL;
  171         }
  172         if (!ap) {
  173                 inop->inode.iso_mode |= VREAD|VEXEC|(VREAD|VEXEC)>>3|(VREAD|VEXEC)>>6;
  174                 inop->inode.iso_uid = (uid_t)0;
  175                 inop->inode.iso_gid = (gid_t)0;
  176         }
  177         if (bp2)
  178                 brelse(bp2);
  179 }
  180 
  181 /*
  182  * Time stamps
  183  */
  184 void
  185 cd9660_deftstamp(isodir,inop,bp,ftype)
  186         struct iso_directory_record *isodir;
  187         struct iso_node *inop;
  188         struct buf *bp;
  189         enum ISO_FTYPE ftype;
  190 {
  191         struct buf *bp2 = NULL;
  192         struct iso_mnt *imp;
  193         struct iso_extended_attributes *ap = NULL;
  194         int off;
  195 
  196         if (!bp
  197             && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
  198             && (off = isonum_711(isodir->ext_attr_length))) {
  199                 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
  200                              &bp2);
  201                 bp = bp2;
  202         }
  203         if (bp) {
  204                 ap = (struct iso_extended_attributes *)bp->b_data;
  205 
  206                 if (ftype != ISO_FTYPE_HIGH_SIERRA
  207                     && isonum_711(ap->version) == 1) {
  208                         if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime))
  209                                 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime);
  210                         if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime))
  211                                 inop->inode.iso_ctime = inop->inode.iso_atime;
  212                         if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime))
  213                                 inop->inode.iso_mtime = inop->inode.iso_ctime;
  214                 } else
  215                         ap = NULL;
  216         }
  217         if (!ap) {
  218                 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime,ftype);
  219                 inop->inode.iso_atime = inop->inode.iso_ctime;
  220                 inop->inode.iso_mtime = inop->inode.iso_ctime;
  221         }
  222         if (bp2)
  223                 brelse(bp2);
  224 }
  225 
  226 int
  227 cd9660_tstamp_conv7(pi,pu,ftype)
  228         u_char *pi;
  229         struct timespec *pu;
  230         enum ISO_FTYPE ftype;
  231 {
  232         int crtime, days;
  233         int y, m, d, hour, minute, second, tz;
  234 
  235         y = pi[0] + 1900;
  236         m = pi[1];
  237         d = pi[2];
  238         hour = pi[3];
  239         minute = pi[4];
  240         second = pi[5];
  241         if(ftype != ISO_FTYPE_HIGH_SIERRA)
  242                 tz = ((signed char *)pi)[6]; /* Timezone value is signed. */
  243         else
  244                 /* original high sierra misses timezone data */
  245                 tz = 0;
  246 
  247         if (y < 1970) {
  248                 pu->tv_sec  = 0;
  249                 pu->tv_nsec = 0;
  250                 return 0;
  251         } else {
  252 #ifdef  ORIGINAL
  253                 /* computes day number relative to Sept. 19th,1989 */
  254                 /* don't even *THINK* about changing formula. It works! */
  255                 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100;
  256 #else
  257                 /*
  258                  * Changed :-) to make it relative to Jan. 1st, 1970
  259                  * and to disambiguate negative division
  260                  */
  261                 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239;
  262 #endif
  263                 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second;
  264 
  265                 /* timezone offset is unreliable on some disks */
  266                 if (-48 <= tz && tz <= 52)
  267                         crtime -= tz * 15 * 60;
  268         }
  269         pu->tv_sec  = crtime;
  270         pu->tv_nsec = 0;
  271         return 1;
  272 }
  273 
  274 static u_int
  275 cd9660_chars2ui(begin,len)
  276         u_char *begin;
  277         int len;
  278 {
  279         u_int rc;
  280 
  281         for (rc = 0; --len >= 0;) {
  282                 rc *= 10;
  283                 rc += *begin++ - '';
  284         }
  285         return rc;
  286 }
  287 
  288 int
  289 cd9660_tstamp_conv17(pi,pu)
  290         u_char *pi;
  291         struct timespec *pu;
  292 {
  293         u_char buf[7];
  294 
  295         /* year:"0001"-"9999" -> -1900  */
  296         buf[0] = cd9660_chars2ui(pi,4) - 1900;
  297 
  298         /* month: " 1"-"12"   -> 1 - 12 */
  299         buf[1] = cd9660_chars2ui(pi + 4,2);
  300 
  301         /* day:   " 1"-"31"   -> 1 - 31 */
  302         buf[2] = cd9660_chars2ui(pi + 6,2);
  303 
  304         /* hour:  " 0"-"23"   -> 0 - 23 */
  305         buf[3] = cd9660_chars2ui(pi + 8,2);
  306 
  307         /* minute:" 0"-"59"   -> 0 - 59 */
  308         buf[4] = cd9660_chars2ui(pi + 10,2);
  309 
  310         /* second:" 0"-"59"   -> 0 - 59 */
  311         buf[5] = cd9660_chars2ui(pi + 12,2);
  312 
  313         /* difference of GMT */
  314         buf[6] = pi[16];
  315 
  316         return cd9660_tstamp_conv7(buf, pu, ISO_FTYPE_DEFAULT);
  317 }
  318 
  319 ino_t
  320 isodirino(isodir, imp)
  321         struct iso_directory_record *isodir;
  322         struct iso_mnt *imp;
  323 {
  324         ino_t ino;
  325 
  326         ino = (isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length))
  327               << imp->im_bshift;
  328         return (ino);
  329 }
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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
