The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/fs/cd9660/cd9660_vfsops.c

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    1 /*-
    2  * Copyright (c) 1994
    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_vfsops.c     8.18 (Berkeley) 5/22/95
   35  */
   36 
   37 #include <sys/cdefs.h>
   38 __FBSDID("$FreeBSD$");
   39 
   40 #include <sys/param.h>
   41 #include <sys/systm.h>
   42 #include <sys/namei.h>
   43 #include <sys/priv.h>
   44 #include <sys/proc.h>
   45 #include <sys/kernel.h>
   46 #include <sys/vnode.h>
   47 #include <sys/mount.h>
   48 #include <sys/bio.h>
   49 #include <sys/buf.h>
   50 #include <sys/cdio.h>
   51 #include <sys/conf.h>
   52 #include <sys/fcntl.h>
   53 #include <sys/malloc.h>
   54 #include <sys/stat.h>
   55 #include <sys/syslog.h>
   56 #include <sys/iconv.h>
   57 
   58 #include <fs/cd9660/iso.h>
   59 #include <fs/cd9660/iso_rrip.h>
   60 #include <fs/cd9660/cd9660_node.h>
   61 #include <fs/cd9660/cd9660_mount.h>
   62 
   63 #include <geom/geom.h>
   64 #include <geom/geom_vfs.h>
   65 
   66 MALLOC_DEFINE(M_ISOFSMNT, "isofs_mount", "ISOFS mount structure");
   67 MALLOC_DEFINE(M_ISOFSNODE, "isofs_node", "ISOFS vnode private part");
   68 
   69 struct iconv_functions *cd9660_iconv = NULL;
   70 
   71 static vfs_mount_t      cd9660_mount;
   72 static vfs_cmount_t     cd9660_cmount;
   73 static vfs_unmount_t    cd9660_unmount;
   74 static vfs_root_t       cd9660_root;
   75 static vfs_statfs_t     cd9660_statfs;
   76 static vfs_vget_t       cd9660_vget;
   77 static vfs_fhtovp_t     cd9660_fhtovp;
   78 
   79 static struct vfsops cd9660_vfsops = {
   80         .vfs_fhtovp =           cd9660_fhtovp,
   81         .vfs_mount =            cd9660_mount,
   82         .vfs_cmount =           cd9660_cmount,
   83         .vfs_root =             cd9660_root,
   84         .vfs_statfs =           cd9660_statfs,
   85         .vfs_unmount =          cd9660_unmount,
   86         .vfs_vget =             cd9660_vget,
   87 };
   88 VFS_SET(cd9660_vfsops, cd9660, VFCF_READONLY);
   89 MODULE_VERSION(cd9660, 1);
   90 
   91 static int iso_mountfs(struct vnode *devvp, struct mount *mp,
   92                        struct thread *td);
   93 
   94 /*
   95  * VFS Operations.
   96  */
   97 
   98 static int
   99 cd9660_cmount(struct mntarg *ma, void *data, int flags, struct thread *td)
  100 {
  101         struct iso_args args;
  102         int error;
  103 
  104         error = copyin(data, &args, sizeof args);
  105         if (error)
  106                 return (error);
  107 
  108         ma = mount_argsu(ma, "from", args.fspec, MAXPATHLEN);
  109         ma = mount_arg(ma, "export", &args.export, sizeof args.export);
  110         ma = mount_argsu(ma, "cs_disk", args.cs_disk, 64);
  111         ma = mount_argsu(ma, "cs_local", args.cs_local, 64);
  112         ma = mount_argf(ma, "ssector", "%u", args.ssector);
  113         ma = mount_argb(ma, !(args.flags & ISOFSMNT_NORRIP), "norrip");
  114         ma = mount_argb(ma, args.flags & ISOFSMNT_GENS, "nogens");
  115         ma = mount_argb(ma, args.flags & ISOFSMNT_EXTATT, "noextatt");
  116         ma = mount_argb(ma, !(args.flags & ISOFSMNT_NOJOLIET), "nojoliet");
  117         ma = mount_argb(ma,
  118             args.flags & ISOFSMNT_BROKENJOLIET, "nobrokenjoliet");
  119         ma = mount_argb(ma, args.flags & ISOFSMNT_KICONV, "nokiconv");
  120 
  121         error = kernel_mount(ma, flags);
  122 
  123         return (error);
  124 }
  125 
  126 static int
  127 cd9660_mount(struct mount *mp, struct thread *td)
  128 {
  129         struct vnode *devvp;
  130         char *fspec;
  131         int error;
  132         mode_t accessmode;
  133         struct nameidata ndp;
  134         struct iso_mnt *imp = 0;
  135 
  136         /*
  137          * Unconditionally mount as read-only.
  138          */
  139         MNT_ILOCK(mp);
  140         mp->mnt_flag |= MNT_RDONLY;
  141         MNT_IUNLOCK(mp);
  142 
  143         fspec = vfs_getopts(mp->mnt_optnew, "from", &error);
  144         if (error)
  145                 return (error);
  146 
  147         imp = VFSTOISOFS(mp);
  148 
  149         if (mp->mnt_flag & MNT_UPDATE) {
  150                 if (vfs_flagopt(mp->mnt_optnew, "export", NULL, 0))
  151                         return (0);
  152         }
  153         /*
  154          * Not an update, or updating the name: look up the name
  155          * and verify that it refers to a sensible block device.
  156          */
  157         NDINIT(&ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, fspec, td);
  158         if ((error = namei(&ndp)))
  159                 return (error);
  160         NDFREE(&ndp, NDF_ONLY_PNBUF);
  161         devvp = ndp.ni_vp;
  162 
  163         if (!vn_isdisk(devvp, &error)) {
  164                 vput(devvp);
  165                 return (error);
  166         }
  167 
  168         /*
  169          * Verify that user has necessary permissions on the device,
  170          * or has superuser abilities
  171          */
  172         accessmode = VREAD;
  173         error = VOP_ACCESS(devvp, accessmode, td->td_ucred, td);
  174         if (error)
  175                 error = priv_check(td, PRIV_VFS_MOUNT_PERM);
  176         if (error) {
  177                 vput(devvp);
  178                 return (error);
  179         }
  180 
  181         if ((mp->mnt_flag & MNT_UPDATE) == 0) {
  182                 error = iso_mountfs(devvp, mp, td);
  183                 if (error)
  184                         vrele(devvp);
  185         } else {
  186                 if (devvp != imp->im_devvp)
  187                         error = EINVAL; /* needs translation */
  188                 vput(devvp);
  189         }
  190         if (error)
  191                 return (error);
  192         vfs_mountedfrom(mp, fspec);
  193         return (0);
  194 }
  195 
  196 /*
  197  * Common code for mount and mountroot
  198  */
  199 static int
  200 iso_mountfs(devvp, mp, td)
  201         struct vnode *devvp;
  202         struct mount *mp;
  203         struct thread *td;
  204 {
  205         struct iso_mnt *isomp = (struct iso_mnt *)0;
  206         struct buf *bp = NULL;
  207         struct buf *pribp = NULL, *supbp = NULL;
  208         struct cdev *dev;
  209         int error = EINVAL;
  210         int high_sierra = 0;
  211         int iso_bsize;
  212         int iso_blknum;
  213         int joliet_level;
  214         struct iso_volume_descriptor *vdp = 0;
  215         struct iso_primary_descriptor *pri = NULL;
  216         struct iso_sierra_primary_descriptor *pri_sierra = NULL;
  217         struct iso_supplementary_descriptor *sup = NULL;
  218         struct iso_directory_record *rootp;
  219         int logical_block_size, ssector;
  220         struct g_consumer *cp;
  221         struct bufobj *bo;
  222         char *cs_local, *cs_disk;
  223 
  224         dev = devvp->v_rdev;
  225         dev_ref(dev);
  226         DROP_GIANT();
  227         g_topology_lock();
  228         error = g_vfs_open(devvp, &cp, "cd9660", 0);
  229         g_topology_unlock();
  230         PICKUP_GIANT();
  231         VOP_UNLOCK(devvp, 0, td);
  232         if (error)
  233                 goto out;
  234         if (devvp->v_rdev->si_iosize_max != 0)
  235                 mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max;
  236         if (mp->mnt_iosize_max > MAXPHYS)
  237                 mp->mnt_iosize_max = MAXPHYS;
  238 
  239         bo = &devvp->v_bufobj;
  240 
  241         /* This is the "logical sector size".  The standard says this
  242          * should be 2048 or the physical sector size on the device,
  243          * whichever is greater.
  244          */
  245         if ((ISO_DEFAULT_BLOCK_SIZE % cp->provider->sectorsize) != 0) {
  246                 error = EINVAL;
  247                 goto out;
  248         }
  249 
  250         iso_bsize = cp->provider->sectorsize;
  251 
  252         joliet_level = 0;
  253         if (1 != vfs_scanopt(mp->mnt_optnew, "ssector", "%d", &ssector))
  254                 ssector = 0;
  255         for (iso_blknum = 16 + ssector;
  256              iso_blknum < 100 + ssector;
  257              iso_blknum++) {
  258                 if ((error = bread(devvp, iso_blknum * btodb(ISO_DEFAULT_BLOCK_SIZE),
  259                                   iso_bsize, NOCRED, &bp)) != 0)
  260                         goto out;
  261 
  262                 vdp = (struct iso_volume_descriptor *)bp->b_data;
  263                 if (bcmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) != 0) {
  264                         if (bcmp (vdp->id_sierra, ISO_SIERRA_ID,
  265                                   sizeof vdp->id) != 0) {
  266                                 error = EINVAL;
  267                                 goto out;
  268                         } else
  269                                 high_sierra = 1;
  270                 }
  271                 switch (isonum_711 (high_sierra? vdp->type_sierra: vdp->type)){
  272                 case ISO_VD_PRIMARY:
  273                         if (pribp == NULL) {
  274                                 pribp = bp;
  275                                 bp = NULL;
  276                                 pri = (struct iso_primary_descriptor *)vdp;
  277                                 pri_sierra =
  278                                   (struct iso_sierra_primary_descriptor *)vdp;
  279                         }
  280                         break;
  281 
  282                 case ISO_VD_SUPPLEMENTARY:
  283                         if (supbp == NULL) {
  284                                 supbp = bp;
  285                                 bp = NULL;
  286                                 sup = (struct iso_supplementary_descriptor *)vdp;
  287 
  288                                 if (!vfs_flagopt(mp->mnt_optnew, "nojoliet", NULL, 0)) {
  289                                         if (bcmp(sup->escape, "%/@", 3) == 0)
  290                                                 joliet_level = 1;
  291                                         if (bcmp(sup->escape, "%/C", 3) == 0)
  292                                                 joliet_level = 2;
  293                                         if (bcmp(sup->escape, "%/E", 3) == 0)
  294                                                 joliet_level = 3;
  295 
  296                                         if ((isonum_711 (sup->flags) & 1) &&
  297                                             !vfs_flagopt(mp->mnt_optnew, "brokenjoliet", NULL, 0))
  298                                                 joliet_level = 0;
  299                                 }
  300                         }
  301                         break;
  302 
  303                 case ISO_VD_END:
  304                         goto vd_end;
  305 
  306                 default:
  307                         break;
  308                 }
  309                 if (bp) {
  310                         brelse(bp);
  311                         bp = NULL;
  312                 }
  313         }
  314  vd_end:
  315         if (bp) {
  316                 brelse(bp);
  317                 bp = NULL;
  318         }
  319 
  320         if (pri == NULL) {
  321                 error = EINVAL;
  322                 goto out;
  323         }
  324 
  325         logical_block_size =
  326                 isonum_723 (high_sierra?
  327                             pri_sierra->logical_block_size:
  328                             pri->logical_block_size);
  329 
  330         if (logical_block_size < DEV_BSIZE || logical_block_size > MAXBSIZE
  331             || (logical_block_size & (logical_block_size - 1)) != 0) {
  332                 error = EINVAL;
  333                 goto out;
  334         }
  335 
  336         rootp = (struct iso_directory_record *)
  337                 (high_sierra?
  338                  pri_sierra->root_directory_record:
  339                  pri->root_directory_record);
  340 
  341         isomp = malloc(sizeof *isomp, M_ISOFSMNT, M_WAITOK | M_ZERO);
  342         isomp->im_cp = cp;
  343         isomp->im_bo = bo;
  344         isomp->logical_block_size = logical_block_size;
  345         isomp->volume_space_size =
  346                 isonum_733 (high_sierra?
  347                             pri_sierra->volume_space_size:
  348                             pri->volume_space_size);
  349         isomp->joliet_level = 0;
  350         /*
  351          * Since an ISO9660 multi-session CD can also access previous
  352          * sessions, we have to include them into the space consider-
  353          * ations.  This doesn't yield a very accurate number since
  354          * parts of the old sessions might be inaccessible now, but we
  355          * can't do much better.  This is also important for the NFS
  356          * filehandle validation.
  357          */
  358         isomp->volume_space_size += ssector;
  359         bcopy (rootp, isomp->root, sizeof isomp->root);
  360         isomp->root_extent = isonum_733 (rootp->extent);
  361         isomp->root_size = isonum_733 (rootp->size);
  362 
  363         isomp->im_bmask = logical_block_size - 1;
  364         isomp->im_bshift = ffs(logical_block_size) - 1;
  365 
  366         pribp->b_flags |= B_AGE;
  367         brelse(pribp);
  368         pribp = NULL;
  369 
  370         mp->mnt_data = (qaddr_t)isomp;
  371         mp->mnt_stat.f_fsid.val[0] = dev2udev(dev);
  372         mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
  373         mp->mnt_maxsymlinklen = 0;
  374         MNT_ILOCK(mp);
  375         mp->mnt_flag |= MNT_LOCAL;
  376         mp->mnt_kern_flag |= MNTK_MPSAFE | MNTK_LOOKUP_SHARED |
  377             MNTK_EXTENDED_SHARED;
  378         MNT_IUNLOCK(mp);
  379         isomp->im_mountp = mp;
  380         isomp->im_dev = dev;
  381         isomp->im_devvp = devvp;
  382 
  383         vfs_flagopt(mp->mnt_optnew, "norrip", &isomp->im_flags, ISOFSMNT_NORRIP);
  384         vfs_flagopt(mp->mnt_optnew, "gens", &isomp->im_flags, ISOFSMNT_GENS);
  385         vfs_flagopt(mp->mnt_optnew, "extatt", &isomp->im_flags, ISOFSMNT_EXTATT);
  386         vfs_flagopt(mp->mnt_optnew, "nojoliet", &isomp->im_flags, ISOFSMNT_NOJOLIET);
  387         vfs_flagopt(mp->mnt_optnew, "kiconv", &isomp->im_flags, ISOFSMNT_KICONV);
  388 
  389         /* Check the Rock Ridge Extension support */
  390         if (!(isomp->im_flags & ISOFSMNT_NORRIP)) {
  391                 if ((error = bread(isomp->im_devvp,
  392                                   (isomp->root_extent + isonum_711(rootp->ext_attr_length)) <<
  393                                   (isomp->im_bshift - DEV_BSHIFT),
  394                                   isomp->logical_block_size, NOCRED, &bp)) != 0)
  395                     goto out;
  396 
  397                 rootp = (struct iso_directory_record *)bp->b_data;
  398 
  399                 if ((isomp->rr_skip = cd9660_rrip_offset(rootp,isomp)) < 0) {
  400                     isomp->im_flags |= ISOFSMNT_NORRIP;
  401                 } else {
  402                     isomp->im_flags &= ~ISOFSMNT_GENS;
  403                 }
  404 
  405                 /*
  406                  * The contents are valid,
  407                  * but they will get reread as part of another vnode, so...
  408                  */
  409                 bp->b_flags |= B_AGE;
  410                 brelse(bp);
  411                 bp = NULL;
  412         }
  413 
  414         if (isomp->im_flags & ISOFSMNT_KICONV && cd9660_iconv) {
  415                 cs_local = vfs_getopts(mp->mnt_optnew, "cs_local", &error);
  416                 if (error)
  417                         goto out;
  418                 cs_disk = vfs_getopts(mp->mnt_optnew, "cs_disk", &error);
  419                 if (error)
  420                         goto out;
  421                 cd9660_iconv->open(cs_local, cs_disk, &isomp->im_d2l);
  422                 cd9660_iconv->open(cs_disk, cs_local, &isomp->im_l2d);
  423         } else {
  424                 isomp->im_d2l = NULL;
  425                 isomp->im_l2d = NULL;
  426         }
  427 
  428         if (high_sierra) {
  429                 /* this effectively ignores all the mount flags */
  430                 if (bootverbose)
  431                         log(LOG_INFO, "cd9660: High Sierra Format\n");
  432                 isomp->iso_ftype = ISO_FTYPE_HIGH_SIERRA;
  433         } else
  434                 switch (isomp->im_flags&(ISOFSMNT_NORRIP|ISOFSMNT_GENS)) {
  435                   default:
  436                           isomp->iso_ftype = ISO_FTYPE_DEFAULT;
  437                           break;
  438                   case ISOFSMNT_GENS|ISOFSMNT_NORRIP:
  439                           isomp->iso_ftype = ISO_FTYPE_9660;
  440                           break;
  441                   case 0:
  442                           if (bootverbose)
  443                                   log(LOG_INFO, "cd9660: RockRidge Extension\n");
  444                           isomp->iso_ftype = ISO_FTYPE_RRIP;
  445                           break;
  446                 }
  447 
  448         /* Decide whether to use the Joliet descriptor */
  449 
  450         if (isomp->iso_ftype != ISO_FTYPE_RRIP && joliet_level) {
  451                 if (bootverbose)
  452                         log(LOG_INFO, "cd9660: Joliet Extension (Level %d)\n",
  453                             joliet_level);
  454                 rootp = (struct iso_directory_record *)
  455                         sup->root_directory_record;
  456                 bcopy (rootp, isomp->root, sizeof isomp->root);
  457                 isomp->root_extent = isonum_733 (rootp->extent);
  458                 isomp->root_size = isonum_733 (rootp->size);
  459                 isomp->joliet_level = joliet_level;
  460                 supbp->b_flags |= B_AGE;
  461         }
  462 
  463         if (supbp) {
  464                 brelse(supbp);
  465                 supbp = NULL;
  466         }
  467 
  468         return 0;
  469 out:
  470         if (bp)
  471                 brelse(bp);
  472         if (pribp)
  473                 brelse(pribp);
  474         if (supbp)
  475                 brelse(supbp);
  476         if (cp != NULL) {
  477                 DROP_GIANT();
  478                 g_topology_lock();
  479                 g_vfs_close(cp, td);
  480                 g_topology_unlock();
  481                 PICKUP_GIANT();
  482         }
  483         if (isomp) {
  484                 free((caddr_t)isomp, M_ISOFSMNT);
  485                 mp->mnt_data = (qaddr_t)0;
  486         }
  487         dev_rel(dev);
  488         return error;
  489 }
  490 
  491 /*
  492  * unmount system call
  493  */
  494 static int
  495 cd9660_unmount(mp, mntflags, td)
  496         struct mount *mp;
  497         int mntflags;
  498         struct thread *td;
  499 {
  500         struct iso_mnt *isomp;
  501         int error, flags = 0;
  502 
  503         if (mntflags & MNT_FORCE)
  504                 flags |= FORCECLOSE;
  505 #if 0
  506         mntflushbuf(mp, 0);
  507         if (mntinvalbuf(mp))
  508                 return EBUSY;
  509 #endif
  510         if ((error = vflush(mp, 0, flags, td)))
  511                 return (error);
  512 
  513         isomp = VFSTOISOFS(mp);
  514 
  515         if (isomp->im_flags & ISOFSMNT_KICONV && cd9660_iconv) {
  516                 if (isomp->im_d2l)
  517                         cd9660_iconv->close(isomp->im_d2l);
  518                 if (isomp->im_l2d)
  519                         cd9660_iconv->close(isomp->im_l2d);
  520         }
  521         DROP_GIANT();
  522         g_topology_lock();
  523         g_vfs_close(isomp->im_cp, td);
  524         g_topology_unlock();
  525         PICKUP_GIANT();
  526         vrele(isomp->im_devvp);
  527         dev_rel(isomp->im_dev);
  528         free((caddr_t)isomp, M_ISOFSMNT);
  529         mp->mnt_data = (qaddr_t)0;
  530         MNT_ILOCK(mp);
  531         mp->mnt_flag &= ~MNT_LOCAL;
  532         MNT_IUNLOCK(mp);
  533         return (error);
  534 }
  535 
  536 /*
  537  * Return root of a filesystem
  538  */
  539 static int
  540 cd9660_root(mp, flags, vpp, td)
  541         struct mount *mp;
  542         int flags;
  543         struct vnode **vpp;
  544         struct thread *td;
  545 {
  546         struct iso_mnt *imp = VFSTOISOFS(mp);
  547         struct iso_directory_record *dp =
  548             (struct iso_directory_record *)imp->root;
  549         ino_t ino = isodirino(dp, imp);
  550 
  551         /*
  552          * With RRIP we must use the `.' entry of the root directory.
  553          * Simply tell vget, that it's a relocated directory.
  554          */
  555         return (cd9660_vget_internal(mp, ino, flags, vpp,
  556             imp->iso_ftype == ISO_FTYPE_RRIP, dp));
  557 }
  558 
  559 /*
  560  * Get filesystem statistics.
  561  */
  562 static int
  563 cd9660_statfs(mp, sbp, td)
  564         struct mount *mp;
  565         struct statfs *sbp;
  566         struct thread *td;
  567 {
  568         struct iso_mnt *isomp;
  569 
  570         isomp = VFSTOISOFS(mp);
  571 
  572         sbp->f_bsize = isomp->logical_block_size;
  573         sbp->f_iosize = sbp->f_bsize;   /* XXX */
  574         sbp->f_blocks = isomp->volume_space_size;
  575         sbp->f_bfree = 0; /* total free blocks */
  576         sbp->f_bavail = 0; /* blocks free for non superuser */
  577         sbp->f_files =  0; /* total files */
  578         sbp->f_ffree = 0; /* free file nodes */
  579         return 0;
  580 }
  581 
  582 /*
  583  * File handle to vnode
  584  *
  585  * Have to be really careful about stale file handles:
  586  * - check that the inode number is in range
  587  * - call iget() to get the locked inode
  588  * - check for an unallocated inode (i_mode == 0)
  589  * - check that the generation number matches
  590  */
  591 
  592 /* ARGSUSED */
  593 static int
  594 cd9660_fhtovp(mp, fhp, vpp)
  595         struct mount *mp;
  596         struct fid *fhp;
  597         struct vnode **vpp;
  598 {
  599         struct ifid ifh;
  600         struct iso_node *ip;
  601         struct vnode *nvp;
  602         int error;
  603 
  604         memcpy(&ifh, fhp, sizeof(ifh));
  605 
  606 #ifdef  ISOFS_DBG
  607         printf("fhtovp: ino %d, start %ld\n",
  608             ifh.ifid_ino, ifh.ifid_start);
  609 #endif
  610 
  611         if ((error = VFS_VGET(mp, ifh.ifid_ino, LK_EXCLUSIVE, &nvp)) != 0) {
  612                 *vpp = NULLVP;
  613                 return (error);
  614         }
  615         ip = VTOI(nvp);
  616         if (ip->inode.iso_mode == 0) {
  617                 vput(nvp);
  618                 *vpp = NULLVP;
  619                 return (ESTALE);
  620         }
  621         *vpp = nvp;
  622         vnode_create_vobject(*vpp, ip->i_size, curthread);
  623         return (0);
  624 }
  625 
  626 static int
  627 cd9660_vget(mp, ino, flags, vpp)
  628         struct mount *mp;
  629         ino_t ino;
  630         int flags;
  631         struct vnode **vpp;
  632 {
  633 
  634         /*
  635          * XXXX
  636          * It would be nice if we didn't always set the `relocated' flag
  637          * and force the extra read, but I don't want to think about fixing
  638          * that right now.
  639          */
  640         return (cd9660_vget_internal(mp, ino, flags, vpp,
  641 #if 0
  642             VFSTOISOFS(mp)->iso_ftype == ISO_FTYPE_RRIP,
  643 #else
  644             0,
  645 #endif
  646             (struct iso_directory_record *)0));
  647 }
  648 
  649 int
  650 cd9660_vget_internal(mp, ino, flags, vpp, relocated, isodir)
  651         struct mount *mp;
  652         ino_t ino;
  653         int flags;
  654         struct vnode **vpp;
  655         int relocated;
  656         struct iso_directory_record *isodir;
  657 {
  658         struct iso_mnt *imp;
  659         struct iso_node *ip;
  660         struct buf *bp;
  661         struct vnode *vp;
  662         struct cdev *dev;
  663         int error;
  664         struct thread *td;
  665 
  666         td = curthread;
  667         error = vfs_hash_get(mp, ino, flags, td, vpp, NULL, NULL);
  668         if (error || *vpp != NULL)
  669                 return (error);
  670 
  671         /*
  672          * We must promote to an exclusive lock for vnode creation.  This
  673          * can happen if lookup is passed LOCKSHARED.
  674          */
  675         if ((flags & LK_TYPE_MASK) == LK_SHARED) {
  676                 flags &= ~LK_TYPE_MASK;
  677                 flags |= LK_EXCLUSIVE;
  678         }
  679 
  680         /*
  681          * We do not lock vnode creation as it is believed to be too
  682          * expensive for such rare case as simultaneous creation of vnode
  683          * for same ino by different processes. We just allow them to race
  684          * and check later to decide who wins. Let the race begin!
  685          */
  686 
  687         imp = VFSTOISOFS(mp);
  688         dev = imp->im_dev;
  689 
  690         /* Allocate a new vnode/iso_node. */
  691         if ((error = getnewvnode("isofs", mp, &cd9660_vnodeops, &vp)) != 0) {
  692                 *vpp = NULLVP;
  693                 return (error);
  694         }
  695         MALLOC(ip, struct iso_node *, sizeof(struct iso_node), M_ISOFSNODE,
  696             M_WAITOK | M_ZERO);
  697         vp->v_data = ip;
  698         ip->i_vnode = vp;
  699         ip->i_number = ino;
  700 
  701         lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL, td);
  702         error = insmntque(vp, mp);
  703         if (error != 0) {
  704                 free(ip, M_ISOFSNODE);
  705                 *vpp = NULLVP;
  706                 return (error);
  707         }
  708         error = vfs_hash_insert(vp, ino, flags, td, vpp, NULL, NULL);
  709         if (error || *vpp != NULL)
  710                 return (error);
  711 
  712         if (isodir == 0) {
  713                 int lbn, off;
  714 
  715                 lbn = lblkno(imp, ino);
  716                 if (lbn >= imp->volume_space_size) {
  717                         vput(vp);
  718                         printf("fhtovp: lbn exceed volume space %d\n", lbn);
  719                         return (ESTALE);
  720                 }
  721 
  722                 off = blkoff(imp, ino);
  723                 if (off + ISO_DIRECTORY_RECORD_SIZE > imp->logical_block_size) {
  724                         vput(vp);
  725                         printf("fhtovp: crosses block boundary %d\n",
  726                                off + ISO_DIRECTORY_RECORD_SIZE);
  727                         return (ESTALE);
  728                 }
  729 
  730                 error = bread(imp->im_devvp,
  731                               lbn << (imp->im_bshift - DEV_BSHIFT),
  732                               imp->logical_block_size, NOCRED, &bp);
  733                 if (error) {
  734                         vput(vp);
  735                         brelse(bp);
  736                         printf("fhtovp: bread error %d\n",error);
  737                         return (error);
  738                 }
  739                 isodir = (struct iso_directory_record *)(bp->b_data + off);
  740 
  741                 if (off + isonum_711(isodir->length) >
  742                     imp->logical_block_size) {
  743                         vput(vp);
  744                         if (bp != 0)
  745                                 brelse(bp);
  746                         printf("fhtovp: directory crosses block boundary %d[off=%d/len=%d]\n",
  747                                off +isonum_711(isodir->length), off,
  748                                isonum_711(isodir->length));
  749                         return (ESTALE);
  750                 }
  751 
  752 #if 0
  753                 if (isonum_733(isodir->extent) +
  754                     isonum_711(isodir->ext_attr_length) != ifhp->ifid_start) {
  755                         if (bp != 0)
  756                                 brelse(bp);
  757                         printf("fhtovp: file start miss %d vs %d\n",
  758                                isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length),
  759                                ifhp->ifid_start);
  760                         return (ESTALE);
  761                 }
  762 #endif
  763         } else
  764                 bp = 0;
  765 
  766         ip->i_mnt = imp;
  767 
  768         if (relocated) {
  769                 /*
  770                  * On relocated directories we must
  771                  * read the `.' entry out of a dir.
  772                  */
  773                 ip->iso_start = ino >> imp->im_bshift;
  774                 if (bp != 0)
  775                         brelse(bp);
  776                 if ((error = cd9660_blkatoff(vp, (off_t)0, NULL, &bp)) != 0) {
  777                         vput(vp);
  778                         return (error);
  779                 }
  780                 isodir = (struct iso_directory_record *)bp->b_data;
  781         }
  782 
  783         ip->iso_extent = isonum_733(isodir->extent);
  784         ip->i_size = isonum_733(isodir->size);
  785         ip->iso_start = isonum_711(isodir->ext_attr_length) + ip->iso_extent;
  786 
  787         /*
  788          * Setup time stamp, attribute
  789          */
  790         vp->v_type = VNON;
  791         switch (imp->iso_ftype) {
  792         default:        /* ISO_FTYPE_9660 */
  793             {
  794                 struct buf *bp2;
  795                 int off;
  796                 if ((imp->im_flags & ISOFSMNT_EXTATT)
  797                     && (off = isonum_711(isodir->ext_attr_length)))
  798                         cd9660_blkatoff(vp, (off_t)-(off << imp->im_bshift), NULL,
  799                                      &bp2);
  800                 else
  801                         bp2 = NULL;
  802                 cd9660_defattr(isodir, ip, bp2, ISO_FTYPE_9660);
  803                 cd9660_deftstamp(isodir, ip, bp2, ISO_FTYPE_9660);
  804                 if (bp2)
  805                         brelse(bp2);
  806                 break;
  807             }
  808         case ISO_FTYPE_RRIP:
  809                 cd9660_rrip_analyze(isodir, ip, imp);
  810                 break;
  811         }
  812 
  813         if (bp != 0)
  814                 brelse(bp);
  815 
  816         /*
  817          * Initialize the associated vnode
  818          */
  819         switch (vp->v_type = IFTOVT(ip->inode.iso_mode)) {
  820         case VFIFO:
  821                 vp->v_op = &cd9660_fifoops;
  822                 break;
  823         default:
  824                 VN_LOCK_ASHARE(vp);
  825                 break;
  826         }
  827 
  828         if (ip->iso_extent == imp->root_extent)
  829                 vp->v_vflag |= VV_ROOT;
  830 
  831         /*
  832          * XXX need generation number?
  833          */
  834 
  835         *vpp = vp;
  836         return (0);
  837 }

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