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: releng/8.4/sys/fs/cd9660/cd9660_node.c 215860 2010-11-26 11:37:35Z kib $");
   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         /*
   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, td);
   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                 struct thread *a_td;
   89         } */ *ap;
   90 {
   91         struct vnode *vp = ap->a_vp;
   92 
   93         /*
   94          * Destroy the vm object and flush associated pages.
   95          */
   96         vnode_destroy_vobject(vp);
   97         /*
   98          * Remove the inode from its hash chain.
   99          */
  100         vfs_hash_remove(vp);
  101 
  102         /*
  103          * Purge old data structures associated with the inode.
  104          */
  105         free(vp->v_data, M_ISOFSNODE);
  106         vp->v_data = NULL;
  107         return (0);
  108 }
  109 
  110 /*
  111  * File attributes
  112  */
  113 void
  114 cd9660_defattr(isodir, inop, bp, ftype)
  115         struct iso_directory_record *isodir;
  116         struct iso_node *inop;
  117         struct buf *bp;
  118         enum ISO_FTYPE ftype;
  119 {
  120         struct buf *bp2 = NULL;
  121         struct iso_mnt *imp;
  122         struct iso_extended_attributes *ap = NULL;
  123         int off;
  124 
  125         /* high sierra does not have timezone data, flag is one byte ahead */
  126         if (isonum_711(ftype == ISO_FTYPE_HIGH_SIERRA?
  127                        &isodir->date[6]: isodir->flags)&2) {
  128                 inop->inode.iso_mode = S_IFDIR;
  129                 /*
  130                  * If we return 2, fts() will assume there are no subdirectories
  131                  * (just links for the path and .), so instead we return 1.
  132                  */
  133                 inop->inode.iso_links = 1;
  134         } else {
  135                 inop->inode.iso_mode = S_IFREG;
  136                 inop->inode.iso_links = 1;
  137         }
  138         if (!bp
  139             && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
  140             && (off = isonum_711(isodir->ext_attr_length))) {
  141                 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
  142                              &bp2);
  143                 bp = bp2;
  144         }
  145         if (bp) {
  146                 ap = (struct iso_extended_attributes *)bp->b_data;
  147 
  148                 if (isonum_711(ap->version) == 1) {
  149                         if (!(ap->perm[0]&0x40))
  150                                 inop->inode.iso_mode |= S_IXOTH;
  151                         if (!(ap->perm[0]&0x10))
  152                                 inop->inode.iso_mode |= S_IROTH;
  153                         if (!(ap->perm[0]&4))
  154                                 inop->inode.iso_mode |= S_IXGRP;
  155                         if (!(ap->perm[0]&1))
  156                                 inop->inode.iso_mode |= S_IRGRP;
  157                         if (!(ap->perm[1]&0x40))
  158                                 inop->inode.iso_mode |= S_IXUSR;
  159                         if (!(ap->perm[1]&0x10))
  160                                 inop->inode.iso_mode |= S_IRUSR;
  161                         inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */
  162                         inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */
  163                 } else
  164                         ap = NULL;
  165         }
  166         if (!ap) {
  167                 inop->inode.iso_mode |= S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
  168                 inop->inode.iso_uid = (uid_t)0;
  169                 inop->inode.iso_gid = (gid_t)0;
  170         }
  171         if (bp2)
  172                 brelse(bp2);
  173 }
  174 
  175 /*
  176  * Time stamps
  177  */
  178 void
  179 cd9660_deftstamp(isodir,inop,bp,ftype)
  180         struct iso_directory_record *isodir;
  181         struct iso_node *inop;
  182         struct buf *bp;
  183         enum ISO_FTYPE ftype;
  184 {
  185         struct buf *bp2 = NULL;
  186         struct iso_mnt *imp;
  187         struct iso_extended_attributes *ap = NULL;
  188         int off;
  189 
  190         if (!bp
  191             && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
  192             && (off = isonum_711(isodir->ext_attr_length))) {
  193                 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
  194                              &bp2);
  195                 bp = bp2;
  196         }
  197         if (bp) {
  198                 ap = (struct iso_extended_attributes *)bp->b_data;
  199 
  200                 if (ftype != ISO_FTYPE_HIGH_SIERRA
  201                     && isonum_711(ap->version) == 1) {
  202                         if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime))
  203                                 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime);
  204                         if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime))
  205                                 inop->inode.iso_ctime = inop->inode.iso_atime;
  206                         if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime))
  207                                 inop->inode.iso_mtime = inop->inode.iso_ctime;
  208                 } else
  209                         ap = NULL;
  210         }
  211         if (!ap) {
  212                 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime,ftype);
  213                 inop->inode.iso_atime = inop->inode.iso_ctime;
  214                 inop->inode.iso_mtime = inop->inode.iso_ctime;
  215         }
  216         if (bp2)
  217                 brelse(bp2);
  218 }
  219 
  220 int
  221 cd9660_tstamp_conv7(pi,pu,ftype)
  222         u_char *pi;
  223         struct timespec *pu;
  224         enum ISO_FTYPE ftype;
  225 {
  226         int crtime, days;
  227         int y, m, d, hour, minute, second, tz;
  228 
  229         y = pi[0] + 1900;
  230         m = pi[1];
  231         d = pi[2];
  232         hour = pi[3];
  233         minute = pi[4];
  234         second = pi[5];
  235         if(ftype != ISO_FTYPE_HIGH_SIERRA)
  236                 tz = ((signed char *)pi)[6]; /* Timezone value is signed. */
  237         else
  238                 /* original high sierra misses timezone data */
  239                 tz = 0;
  240 
  241         if (y < 1970) {
  242                 pu->tv_sec  = 0;
  243                 pu->tv_nsec = 0;
  244                 return 0;
  245         } else {
  246 #ifdef  ORIGINAL
  247                 /* computes day number relative to Sept. 19th,1989 */
  248                 /* don't even *THINK* about changing formula. It works! */
  249                 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100;
  250 #else
  251                 /*
  252                  * Changed :-) to make it relative to Jan. 1st, 1970
  253                  * and to disambiguate negative division
  254                  */
  255                 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239;
  256 #endif
  257                 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second;
  258 
  259                 /* timezone offset is unreliable on some disks */
  260                 if (-48 <= tz && tz <= 52)
  261                         crtime -= tz * 15 * 60;
  262         }
  263         pu->tv_sec  = crtime;
  264         pu->tv_nsec = 0;
  265         return 1;
  266 }
  267 
  268 static u_int
  269 cd9660_chars2ui(begin,len)
  270         u_char *begin;
  271         int len;
  272 {
  273         u_int rc;
  274 
  275         for (rc = 0; --len >= 0;) {
  276                 rc *= 10;
  277                 rc += *begin++ - '';
  278         }
  279         return rc;
  280 }
  281 
  282 int
  283 cd9660_tstamp_conv17(pi,pu)
  284         u_char *pi;
  285         struct timespec *pu;
  286 {
  287         u_char buf[7];
  288 
  289         /* year:"0001"-"9999" -> -1900  */
  290         buf[0] = cd9660_chars2ui(pi,4) - 1900;
  291 
  292         /* month: " 1"-"12"   -> 1 - 12 */
  293         buf[1] = cd9660_chars2ui(pi + 4,2);
  294 
  295         /* day:   " 1"-"31"   -> 1 - 31 */
  296         buf[2] = cd9660_chars2ui(pi + 6,2);
  297 
  298         /* hour:  " 0"-"23"   -> 0 - 23 */
  299         buf[3] = cd9660_chars2ui(pi + 8,2);
  300 
  301         /* minute:" 0"-"59"   -> 0 - 59 */
  302         buf[4] = cd9660_chars2ui(pi + 10,2);
  303 
  304         /* second:" 0"-"59"   -> 0 - 59 */
  305         buf[5] = cd9660_chars2ui(pi + 12,2);
  306 
  307         /* difference of GMT */
  308         buf[6] = pi[16];
  309 
  310         return cd9660_tstamp_conv7(buf, pu, ISO_FTYPE_DEFAULT);
  311 }
  312 
  313 ino_t
  314 isodirino(isodir, imp)
  315         struct iso_directory_record *isodir;
  316         struct iso_mnt *imp;
  317 {
  318         ino_t ino;
  319 
  320         ino = (isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length))
  321               << imp->im_bshift;
  322         return (ino);
  323 }
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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
