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