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/8.0/sys/fs/cd9660/cd9660_node.c 187838 2009-01-28 18:54:56Z jhb $");
   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         /*
   76          * If we are done with the inode, reclaim it
   77          * so that it can be reused immediately.
   78          */
   79         if (ip->inode.iso_mode == 0)
   80                 vrecycle(vp, td);
   81         return error;
   82 }
   83 
   84 /*
   85  * Reclaim an inode so that it can be used for other purposes.
   86  */
   87 int
   88 cd9660_reclaim(ap)
   89         struct vop_reclaim_args /* {
   90                 struct vnode *a_vp;
   91                 struct thread *a_td;
   92         } */ *ap;
   93 {
   94         struct vnode *vp = ap->a_vp;
   95 
   96         if (prtactive && vrefcnt(vp) != 0)
   97                 vprint("cd9660_reclaim: pushing active", vp);
   98         /*
   99          * Destroy the vm object and flush associated pages.
  100          */
  101         vnode_destroy_vobject(vp);
  102         /*
  103          * Remove the inode from its hash chain.
  104          */
  105         vfs_hash_remove(vp);
  106 
  107         /*
  108          * Purge old data structures associated with the inode.
  109          */
  110         free(vp->v_data, M_ISOFSNODE);
  111         vp->v_data = NULL;
  112         return (0);
  113 }
  114 
  115 /*
  116  * File attributes
  117  */
  118 void
  119 cd9660_defattr(isodir, inop, bp, ftype)
  120         struct iso_directory_record *isodir;
  121         struct iso_node *inop;
  122         struct buf *bp;
  123         enum ISO_FTYPE ftype;
  124 {
  125         struct buf *bp2 = NULL;
  126         struct iso_mnt *imp;
  127         struct iso_extended_attributes *ap = NULL;
  128         int off;
  129 
  130         /* high sierra does not have timezone data, flag is one byte ahead */
  131         if (isonum_711(ftype == ISO_FTYPE_HIGH_SIERRA?
  132                        &isodir->date[6]: isodir->flags)&2) {
  133                 inop->inode.iso_mode = S_IFDIR;
  134                 /*
  135                  * If we return 2, fts() will assume there are no subdirectories
  136                  * (just links for the path and .), so instead we return 1.
  137                  */
  138                 inop->inode.iso_links = 1;
  139         } else {
  140                 inop->inode.iso_mode = S_IFREG;
  141                 inop->inode.iso_links = 1;
  142         }
  143         if (!bp
  144             && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
  145             && (off = isonum_711(isodir->ext_attr_length))) {
  146                 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
  147                              &bp2);
  148                 bp = bp2;
  149         }
  150         if (bp) {
  151                 ap = (struct iso_extended_attributes *)bp->b_data;
  152 
  153                 if (isonum_711(ap->version) == 1) {
  154                         if (!(ap->perm[0]&0x40))
  155                                 inop->inode.iso_mode |= S_IXOTH;
  156                         if (!(ap->perm[0]&0x10))
  157                                 inop->inode.iso_mode |= S_IROTH;
  158                         if (!(ap->perm[0]&4))
  159                                 inop->inode.iso_mode |= S_IXGRP;
  160                         if (!(ap->perm[0]&1))
  161                                 inop->inode.iso_mode |= S_IRGRP;
  162                         if (!(ap->perm[1]&0x40))
  163                                 inop->inode.iso_mode |= S_IXUSR;
  164                         if (!(ap->perm[1]&0x10))
  165                                 inop->inode.iso_mode |= S_IRUSR;
  166                         inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */
  167                         inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */
  168                 } else
  169                         ap = NULL;
  170         }
  171         if (!ap) {
  172                 inop->inode.iso_mode |= S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
  173                 inop->inode.iso_uid = (uid_t)0;
  174                 inop->inode.iso_gid = (gid_t)0;
  175         }
  176         if (bp2)
  177                 brelse(bp2);
  178 }
  179 
  180 /*
  181  * Time stamps
  182  */
  183 void
  184 cd9660_deftstamp(isodir,inop,bp,ftype)
  185         struct iso_directory_record *isodir;
  186         struct iso_node *inop;
  187         struct buf *bp;
  188         enum ISO_FTYPE ftype;
  189 {
  190         struct buf *bp2 = NULL;
  191         struct iso_mnt *imp;
  192         struct iso_extended_attributes *ap = NULL;
  193         int off;
  194 
  195         if (!bp
  196             && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
  197             && (off = isonum_711(isodir->ext_attr_length))) {
  198                 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
  199                              &bp2);
  200                 bp = bp2;
  201         }
  202         if (bp) {
  203                 ap = (struct iso_extended_attributes *)bp->b_data;
  204 
  205                 if (ftype != ISO_FTYPE_HIGH_SIERRA
  206                     && isonum_711(ap->version) == 1) {
  207                         if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime))
  208                                 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime);
  209                         if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime))
  210                                 inop->inode.iso_ctime = inop->inode.iso_atime;
  211                         if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime))
  212                                 inop->inode.iso_mtime = inop->inode.iso_ctime;
  213                 } else
  214                         ap = NULL;
  215         }
  216         if (!ap) {
  217                 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime,ftype);
  218                 inop->inode.iso_atime = inop->inode.iso_ctime;
  219                 inop->inode.iso_mtime = inop->inode.iso_ctime;
  220         }
  221         if (bp2)
  222                 brelse(bp2);
  223 }
  224 
  225 int
  226 cd9660_tstamp_conv7(pi,pu,ftype)
  227         u_char *pi;
  228         struct timespec *pu;
  229         enum ISO_FTYPE ftype;
  230 {
  231         int crtime, days;
  232         int y, m, d, hour, minute, second, tz;
  233 
  234         y = pi[0] + 1900;
  235         m = pi[1];
  236         d = pi[2];
  237         hour = pi[3];
  238         minute = pi[4];
  239         second = pi[5];
  240         if(ftype != ISO_FTYPE_HIGH_SIERRA)
  241                 tz = ((signed char *)pi)[6]; /* Timezone value is signed. */
  242         else
  243                 /* original high sierra misses timezone data */
  244                 tz = 0;
  245 
  246         if (y < 1970) {
  247                 pu->tv_sec  = 0;
  248                 pu->tv_nsec = 0;
  249                 return 0;
  250         } else {
  251 #ifdef  ORIGINAL
  252                 /* computes day number relative to Sept. 19th,1989 */
  253                 /* don't even *THINK* about changing formula. It works! */
  254                 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100;
  255 #else
  256                 /*
  257                  * Changed :-) to make it relative to Jan. 1st, 1970
  258                  * and to disambiguate negative division
  259                  */
  260                 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239;
  261 #endif
  262                 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second;
  263 
  264                 /* timezone offset is unreliable on some disks */
  265                 if (-48 <= tz && tz <= 52)
  266                         crtime -= tz * 15 * 60;
  267         }
  268         pu->tv_sec  = crtime;
  269         pu->tv_nsec = 0;
  270         return 1;
  271 }
  272 
  273 static u_int
  274 cd9660_chars2ui(begin,len)
  275         u_char *begin;
  276         int len;
  277 {
  278         u_int rc;
  279 
  280         for (rc = 0; --len >= 0;) {
  281                 rc *= 10;
  282                 rc += *begin++ - '';
  283         }
  284         return rc;
  285 }
  286 
  287 int
  288 cd9660_tstamp_conv17(pi,pu)
  289         u_char *pi;
  290         struct timespec *pu;
  291 {
  292         u_char buf[7];
  293 
  294         /* year:"0001"-"9999" -> -1900  */
  295         buf[0] = cd9660_chars2ui(pi,4) - 1900;
  296 
  297         /* month: " 1"-"12"   -> 1 - 12 */
  298         buf[1] = cd9660_chars2ui(pi + 4,2);
  299 
  300         /* day:   " 1"-"31"   -> 1 - 31 */
  301         buf[2] = cd9660_chars2ui(pi + 6,2);
  302 
  303         /* hour:  " 0"-"23"   -> 0 - 23 */
  304         buf[3] = cd9660_chars2ui(pi + 8,2);
  305 
  306         /* minute:" 0"-"59"   -> 0 - 59 */
  307         buf[4] = cd9660_chars2ui(pi + 10,2);
  308 
  309         /* second:" 0"-"59"   -> 0 - 59 */
  310         buf[5] = cd9660_chars2ui(pi + 12,2);
  311 
  312         /* difference of GMT */
  313         buf[6] = pi[16];
  314 
  315         return cd9660_tstamp_conv7(buf, pu, ISO_FTYPE_DEFAULT);
  316 }
  317 
  318 ino_t
  319 isodirino(isodir, imp)
  320         struct iso_directory_record *isodir;
  321         struct iso_mnt *imp;
  322 {
  323         ino_t ino;
  324 
  325         ino = (isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length))
  326               << imp->im_bshift;
  327         return (ino);
  328 }
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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
