sys/fs/cd9660/cd9660_node.c

   1 /*      $NetBSD: cd9660_node.c,v 1.34 2014/11/10 18:46:33 maxv Exp $    */
   2
   3 /*-
   4  * Copyright (c) 1982, 1986, 1989, 1994
   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       8.8 (Berkeley) 5/22/95
  37  */
  38
  39 #include <sys/cdefs.h>
  40 __KERNEL_RCSID(0, "$NetBSD: cd9660_node.c,v 1.34 2014/11/10 18:46:33 maxv Exp $");
  41
  42 #include <sys/param.h>
  43 #include <sys/systm.h>
  44 #include <sys/mount.h>
  45 #include <sys/proc.h>
  46 #include <sys/file.h>
  47 #include <sys/buf.h>
  48 #include <sys/vnode.h>
  49 #include <sys/namei.h>
  50 #include <sys/kernel.h>
  51 #include <sys/pool.h>
  52 #include <sys/stat.h>
  53
  54 #include <fs/cd9660/iso.h>
  55 #include <fs/cd9660/cd9660_extern.h>
  56 #include <fs/cd9660/cd9660_node.h>
  57 #include <fs/cd9660/cd9660_mount.h>
  58 #include <fs/cd9660/iso_rrip.h>
  59
  60 extern int prtactive;   /* 1 => print out reclaim of active vnodes */
  61
  62 struct pool cd9660_node_pool;
  63
  64 static u_int cd9660_chars2ui(const u_char *, int);
  65
  66 /*
  67  * Initialize pool for nodes.
  68  */
  69 void
  70 cd9660_init(void)
  71 {
  72
  73         malloc_type_attach(M_ISOFSMNT);
  74         pool_init(&cd9660_node_pool, sizeof(struct iso_node), 0, 0, 0,
  75             "cd9660nopl", &pool_allocator_nointr, IPL_NONE);
  76 }
  77
  78 /*
  79  * Reinitialize.
  80  */
  81
  82 void
  83 cd9660_reinit(void)
  84 {
  85
  86 }
  87
  88 /*
  89  * Destroy node pool.
  90  */
  91 void
  92 cd9660_done(void)
  93 {
  94         pool_destroy(&cd9660_node_pool);
  95         malloc_type_detach(M_ISOFSMNT);
  96 }
  97
  98 /*
  99  * Last reference to an inode, write the inode out and if necessary,
 100  * truncate and deallocate the file.
 101  */
 102 int
 103 cd9660_inactive(void *v)
 104 {
 105         struct vop_inactive_args /* {
 106                 struct vnode *a_vp;
 107                 bool *a_recycle;
 108         } */ *ap = v;
 109         struct vnode *vp = ap->a_vp;
 110         struct iso_node *ip = VTOI(vp);
 111         int error = 0;
 112
 113         /*
 114          * If we are done with the inode, reclaim it
 115          * so that it can be reused immediately.
 116          */
 117         ip->i_flag = 0;
 118         *ap->a_recycle = (ip->inode.iso_mode == 0);
 119         VOP_UNLOCK(vp);
 120         return error;
 121 }
 122
 123 /*
 124  * Reclaim an inode so that it can be used for other purposes.
 125  */
 126 int
 127 cd9660_reclaim(void *v)
 128 {
 129         struct vop_reclaim_args /* {
 130                 struct vnode *a_vp;
 131                 struct lwp *a_l;
 132         } */ *ap = v;
 133         struct vnode *vp = ap->a_vp;
 134         struct iso_node *ip = VTOI(vp);
 135
 136         if (prtactive && vp->v_usecount > 1)
 137                 vprint("cd9660_reclaim: pushing active", vp);
 138         /*
 139          * Remove the inode from the vnode cache.
 140          */
 141         vcache_remove(vp->v_mount, &ip->i_number, sizeof(ip->i_number));
 142         /*
 143          * Purge old data structures associated with the inode.
 144          */
 145         genfs_node_destroy(vp);
 146         pool_put(&cd9660_node_pool, vp->v_data);
 147         vp->v_data = NULL;
 148         return (0);
 149 }
 150
 151 /*
 152  * File attributes
 153  */
 154 void
 155 cd9660_defattr(struct iso_directory_record *isodir, struct iso_node *inop,
 156         struct buf *bp)
 157 {
 158         struct buf *bp2 = NULL;
 159         struct iso_mnt *imp;
 160         struct iso_extended_attributes *ap = NULL;
 161         int off;
 162
 163         if (isonum_711(isodir->flags)&2) {
 164                 inop->inode.iso_mode = S_IFDIR;
 165                 /*
 166                  * If we return 2, fts() will assume there are no subdirectories
 167                  * (just links for the path and .), so instead we return 1.
 168                  */
 169                 inop->inode.iso_links = 1;
 170         } else {
 171                 inop->inode.iso_mode = S_IFREG;
 172                 inop->inode.iso_links = 1;
 173         }
 174         if (!bp
 175             && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
 176             && (off = isonum_711(isodir->ext_attr_length))) {
 177                 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift),
 178                     NULL, &bp2);
 179                 bp = bp2;
 180         }
 181         if (bp) {
 182                 ap = (struct iso_extended_attributes *)bp->b_data;
 183
 184                 if (isonum_711(ap->version) == 1) {
 185                         if (!(ap->perm[1]&0x10))
 186                                 inop->inode.iso_mode |= S_IRUSR;
 187                         if (!(ap->perm[1]&0x40))
 188                                 inop->inode.iso_mode |= S_IXUSR;
 189                         if (!(ap->perm[0]&0x01))
 190                                 inop->inode.iso_mode |= S_IRGRP;
 191                         if (!(ap->perm[0]&0x04))
 192                                 inop->inode.iso_mode |= S_IXGRP;
 193                         if (!(ap->perm[0]&0x10))
 194                                 inop->inode.iso_mode |= S_IROTH;
 195                         if (!(ap->perm[0]&0x40))
 196                                 inop->inode.iso_mode |= S_IXOTH;
 197                         inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */
 198                         inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */
 199                 } else
 200                         ap = NULL;
 201         }
 202         if (!ap) {
 203                 inop->inode.iso_mode |=
 204                     S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
 205                 inop->inode.iso_uid = (uid_t)0;
 206                 inop->inode.iso_gid = (gid_t)0;
 207         }
 208         if (bp2)
 209                 brelse(bp2, 0);
 210 }
 211
 212 /*
 213  * Time stamps
 214  */
 215 void
 216 cd9660_deftstamp(struct iso_directory_record *isodir, struct iso_node *inop,
 217         struct buf *bp)
 218 {
 219         struct buf *bp2 = NULL;
 220         struct iso_mnt *imp;
 221         struct iso_extended_attributes *ap = NULL;
 222         int off;
 223
 224         if (!bp
 225             && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
 226             && (off = isonum_711(isodir->ext_attr_length))) {
 227                 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift),
 228                     NULL, &bp2);
 229                 bp = bp2;
 230         }
 231         if (bp) {
 232                 ap = (struct iso_extended_attributes *)bp->b_data;
 233
 234                 if (isonum_711(ap->version) == 1) {
 235                         if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime))
 236                                 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime);
 237                         if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime))
 238                                 inop->inode.iso_ctime = inop->inode.iso_atime;
 239                         if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime))
 240                                 inop->inode.iso_mtime = inop->inode.iso_ctime;
 241                 } else
 242                         ap = NULL;
 243         }
 244         if (!ap) {
 245                 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime);
 246                 inop->inode.iso_atime = inop->inode.iso_ctime;
 247                 inop->inode.iso_mtime = inop->inode.iso_ctime;
 248         }
 249         if (bp2)
 250                 brelse(bp2, 0);
 251 }
 252
 253 int
 254 cd9660_tstamp_conv7(const u_char *pi, struct timespec *pu)
 255 {
 256         int crtime, days;
 257         int y, m, d, hour, minute, second, tz;
 258
 259         y = pi[0] + 1900;
 260         m = pi[1];
 261         d = pi[2];
 262         hour = pi[3];
 263         minute = pi[4];
 264         second = pi[5];
 265         tz = pi[6];
 266
 267         if (y < 1970) {
 268                 pu->tv_sec  = 0;
 269                 pu->tv_nsec = 0;
 270                 return 0;
 271         } else {
 272 #ifdef  ORIGINAL
 273                 /* computes day number relative to Sept. 19th,1989 */
 274                 /* don't even *THINK* about changing formula. It works! */
 275                 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100;
 276 #else
 277                 /*
 278                  * Changed :-) to make it relative to Jan. 1st, 1970
 279                  * and to disambiguate negative division
 280                  */
 281                 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239;
 282 #endif
 283                 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second;
 284
 285                 /* timezone offset is unreliable on some disks */
 286                 if (-48 <= tz && tz <= 52)
 287                         crtime -= tz * 15 * 60;
 288         }
 289         pu->tv_sec  = crtime;
 290         pu->tv_nsec = 0;
 291         return 1;
 292 }
 293
 294 static u_int
 295 cd9660_chars2ui(const u_char *begin, int len)
 296 {
 297         u_int rc;
 298
 299         for (rc = 0; --len >= 0;) {
 300                 rc *= 10;
 301                 rc += *begin++ - '0';
 302         }
 303         return rc;
 304 }
 305
 306 int
 307 cd9660_tstamp_conv17(const u_char *pi, struct timespec *pu)
 308 {
 309         u_char tbuf[7];
 310
 311         /* year:"0001"-"9999" -> -1900  */
 312         tbuf[0] = cd9660_chars2ui(pi,4) - 1900;
 313
 314         /* month: " 1"-"12"      -> 1 - 12 */
 315         tbuf[1] = cd9660_chars2ui(pi + 4,2);
 316
 317         /* day:   " 1"-"31"      -> 1 - 31 */
 318         tbuf[2] = cd9660_chars2ui(pi + 6,2);
 319
 320         /* hour:  " 0"-"23"      -> 0 - 23 */
 321         tbuf[3] = cd9660_chars2ui(pi + 8,2);
 322
 323         /* minute:" 0"-"59"      -> 0 - 59 */
 324         tbuf[4] = cd9660_chars2ui(pi + 10,2);
 325
 326         /* second:" 0"-"59"      -> 0 - 59 */
 327         tbuf[5] = cd9660_chars2ui(pi + 12,2);
 328
 329         /* difference of GMT */
 330         tbuf[6] = pi[16];
 331
 332         return cd9660_tstamp_conv7(tbuf,pu);
 333 }
 334
 335 ino_t
 336 isodirino(struct iso_directory_record *isodir, struct iso_mnt *imp)
 337 {
 338         ino_t ino;
 339
 340         /*
 341          * Note there is an inverse calculation in
 342          * cd9660_vfsops.c:cd9660_loadvnode():
 343          *   ip->iso_start = ino >> imp->im_bshift;
 344          * and also a calculation of the isodir pointer
 345          * from an inode in cd9660_vnops.c:cd9660_readlink()
 346          */
 347         ino = ((ino_t)isonum_733(isodir->extent) +
 348                 isonum_711(isodir->ext_attr_length)) << imp->im_bshift;
 349         return ino;
 350 }