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  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 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_vfsops.c     8.18 (Berkeley) 5/22/95
   37  */
   38 
   39 #include <sys/cdefs.h>
   40 __FBSDID("$FreeBSD$");
   41 
   42 #include <sys/param.h>
   43 #include <sys/systm.h>
   44 #include <sys/namei.h>
   45 #include <sys/priv.h>
   46 #include <sys/proc.h>
   47 #include <sys/kernel.h>
   48 #include <sys/vnode.h>
   49 #include <sys/mount.h>
   50 #include <sys/bio.h>
   51 #include <sys/buf.h>
   52 #include <sys/cdio.h>
   53 #include <sys/conf.h>
   54 #include <sys/fcntl.h>
   55 #include <sys/malloc.h>
   56 #include <sys/stat.h>
   57 #include <sys/syslog.h>
   58 #include <sys/iconv.h>
   59 
   60 #include <fs/cd9660/iso.h>
   61 #include <fs/cd9660/iso_rrip.h>
   62 #include <fs/cd9660/cd9660_node.h>
   63 #include <fs/cd9660/cd9660_mount.h>
   64 
   65 #include <geom/geom.h>
   66 #include <geom/geom_vfs.h>
   67 
   68 MALLOC_DEFINE(M_ISOFSMNT, "isofs_mount", "ISOFS mount structure");
   69 MALLOC_DEFINE(M_ISOFSNODE, "isofs_node", "ISOFS vnode private part");
   70 
   71 struct iconv_functions *cd9660_iconv = NULL;
   72 
   73 static vfs_mount_t      cd9660_mount;
   74 static vfs_cmount_t     cd9660_cmount;
   75 static vfs_unmount_t    cd9660_unmount;
   76 static vfs_root_t       cd9660_root;
   77 static vfs_statfs_t     cd9660_statfs;
   78 static vfs_vget_t       cd9660_vget;
   79 static vfs_fhtovp_t     cd9660_fhtovp;
   80 
   81 static struct vfsops cd9660_vfsops = {
   82         .vfs_fhtovp =           cd9660_fhtovp,
   83         .vfs_mount =            cd9660_mount,
   84         .vfs_cmount =           cd9660_cmount,
   85         .vfs_root =             cd9660_root,
   86         .vfs_statfs =           cd9660_statfs,
   87         .vfs_unmount =          cd9660_unmount,
   88         .vfs_vget =             cd9660_vget,
   89 };
   90 VFS_SET(cd9660_vfsops, cd9660, VFCF_READONLY);
   91 MODULE_VERSION(cd9660, 1);
   92 
   93 static int cd9660_vfs_hash_cmp(struct vnode *vp, void *pino);
   94 static int iso_mountfs(struct vnode *devvp, struct mount *mp);
   95 
   96 /*
   97  * VFS Operations.
   98  */
   99 
  100 static int
  101 cd9660_cmount(struct mntarg *ma, void *data, uint64_t flags)
  102 {
  103         struct iso_args args;
  104         int error;
  105 
  106         error = copyin(data, &args, sizeof args);
  107         if (error)
  108                 return (error);
  109 
  110         ma = mount_argsu(ma, "from", args.fspec, MAXPATHLEN);
  111         ma = mount_arg(ma, "export", &args.export, sizeof(args.export));
  112         ma = mount_argsu(ma, "cs_disk", args.cs_disk, 64);
  113         ma = mount_argsu(ma, "cs_local", args.cs_local, 64);
  114         ma = mount_argf(ma, "ssector", "%u", args.ssector);
  115         ma = mount_argb(ma, !(args.flags & ISOFSMNT_NORRIP), "norrip");
  116         ma = mount_argb(ma, args.flags & ISOFSMNT_GENS, "nogens");
  117         ma = mount_argb(ma, args.flags & ISOFSMNT_EXTATT, "noextatt");
  118         ma = mount_argb(ma, !(args.flags & ISOFSMNT_NOJOLIET), "nojoliet");
  119         ma = mount_argb(ma,
  120             args.flags & ISOFSMNT_BROKENJOLIET, "nobrokenjoliet");
  121         ma = mount_argb(ma, args.flags & ISOFSMNT_KICONV, "nokiconv");
  122 
  123         error = kernel_mount(ma, flags);
  124 
  125         return (error);
  126 }
  127 
  128 static int
  129 cd9660_mount(struct mount *mp)
  130 {
  131         struct vnode *devvp;
  132         struct thread *td;
  133         char *fspec;
  134         int error;
  135         accmode_t accmode;
  136         struct nameidata ndp;
  137         struct iso_mnt *imp = NULL;
  138 
  139         td = curthread;
  140 
  141         /*
  142          * Unconditionally mount as read-only.
  143          */
  144         MNT_ILOCK(mp);
  145         mp->mnt_flag |= MNT_RDONLY;
  146         MNT_IUNLOCK(mp);
  147 
  148         fspec = vfs_getopts(mp->mnt_optnew, "from", &error);
  149         if (error)
  150                 return (error);
  151 
  152         imp = VFSTOISOFS(mp);
  153 
  154         if (mp->mnt_flag & MNT_UPDATE) {
  155                 if (vfs_flagopt(mp->mnt_optnew, "export", NULL, 0))
  156                         return (0);
  157         }
  158         /*
  159          * Not an update, or updating the name: look up the name
  160          * and verify that it refers to a sensible block device.
  161          */
  162         NDINIT(&ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, fspec, td);
  163         if ((error = namei(&ndp)))
  164                 return (error);
  165         NDFREE(&ndp, NDF_ONLY_PNBUF);
  166         devvp = ndp.ni_vp;
  167 
  168         if (!vn_isdisk_error(devvp, &error)) {
  169                 vput(devvp);
  170                 return (error);
  171         }
  172 
  173         /*
  174          * Verify that user has necessary permissions on the device,
  175          * or has superuser abilities
  176          */
  177         accmode = VREAD;
  178         error = VOP_ACCESS(devvp, accmode, td->td_ucred, td);
  179         if (error)
  180                 error = priv_check(td, PRIV_VFS_MOUNT_PERM);
  181         if (error) {
  182                 vput(devvp);
  183                 return (error);
  184         }
  185 
  186         if ((mp->mnt_flag & MNT_UPDATE) == 0) {
  187                 error = iso_mountfs(devvp, mp);
  188                 if (error)
  189                         vrele(devvp);
  190         } else {
  191                 if (devvp != imp->im_devvp)
  192                         error = EINVAL; /* needs translation */
  193                 vput(devvp);
  194         }
  195         if (error)
  196                 return (error);
  197         vfs_mountedfrom(mp, fspec);
  198         return (0);
  199 }
  200 
  201 /*
  202  * Common code for mount and mountroot
  203  */
  204 static int
  205 iso_mountfs(devvp, mp)
  206         struct vnode *devvp;
  207         struct mount *mp;
  208 {
  209         struct iso_mnt *isomp = NULL;
  210         struct buf *bp = NULL;
  211         struct buf *pribp = NULL, *supbp = NULL;
  212         struct cdev *dev;
  213         int error = EINVAL;
  214         int high_sierra = 0;
  215         int iso_bsize;
  216         int iso_blknum;
  217         int joliet_level;
  218         int isverified = 0;
  219         struct iso_volume_descriptor *vdp = NULL;
  220         struct iso_primary_descriptor *pri = NULL;
  221         struct iso_sierra_primary_descriptor *pri_sierra = NULL;
  222         struct iso_supplementary_descriptor *sup = NULL;
  223         struct iso_directory_record *rootp;
  224         int logical_block_size, ssector;
  225         struct g_consumer *cp;
  226         struct bufobj *bo;
  227         char *cs_local, *cs_disk;
  228 
  229         dev = devvp->v_rdev;
  230         dev_ref(dev);
  231         g_topology_lock();
  232         error = g_vfs_open(devvp, &cp, "cd9660", 0);
  233         if (error == 0)
  234                 g_getattr("MNT::verified", cp, &isverified);
  235         g_topology_unlock();
  236         VOP_UNLOCK(devvp);
  237         if (error)
  238                 goto out;
  239         if (devvp->v_rdev->si_iosize_max != 0)
  240                 mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max;
  241         if (mp->mnt_iosize_max > maxphys)
  242                 mp->mnt_iosize_max = maxphys;
  243 
  244         bo = &devvp->v_bufobj;
  245 
  246         /* This is the "logical sector size".  The standard says this
  247          * should be 2048 or the physical sector size on the device,
  248          * whichever is greater.
  249          */
  250         if ((ISO_DEFAULT_BLOCK_SIZE % cp->provider->sectorsize) != 0) {
  251                 error = EINVAL;
  252                 goto out;
  253         }
  254 
  255         iso_bsize = cp->provider->sectorsize;
  256 
  257         joliet_level = 0;
  258         if (1 != vfs_scanopt(mp->mnt_optnew, "ssector", "%d", &ssector))
  259                 ssector = 0;
  260         for (iso_blknum = 16 + ssector;
  261              iso_blknum < 100 + ssector;
  262              iso_blknum++) {
  263                 if ((error = bread(devvp, iso_blknum * btodb(ISO_DEFAULT_BLOCK_SIZE),
  264                                   iso_bsize, NOCRED, &bp)) != 0)
  265                         goto out;
  266 
  267                 vdp = (struct iso_volume_descriptor *)bp->b_data;
  268                 if (bcmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) != 0) {
  269                         if (bcmp (vdp->id_sierra, ISO_SIERRA_ID,
  270                                   sizeof vdp->id_sierra) != 0) {
  271                                 error = EINVAL;
  272                                 goto out;
  273                         } else
  274                                 high_sierra = 1;
  275                 }
  276                 switch (isonum_711 (high_sierra? vdp->type_sierra: vdp->type)){
  277                 case ISO_VD_PRIMARY:
  278                         if (pribp == NULL) {
  279                                 pribp = bp;
  280                                 bp = NULL;
  281                                 pri = (struct iso_primary_descriptor *)vdp;
  282                                 pri_sierra =
  283                                   (struct iso_sierra_primary_descriptor *)vdp;
  284                         }
  285                         break;
  286 
  287                 case ISO_VD_SUPPLEMENTARY:
  288                         if (supbp == NULL) {
  289                                 supbp = bp;
  290                                 bp = NULL;
  291                                 sup = (struct iso_supplementary_descriptor *)vdp;
  292 
  293                                 if (!vfs_flagopt(mp->mnt_optnew, "nojoliet", NULL, 0)) {
  294                                         if (bcmp(sup->escape, "%/@", 3) == 0)
  295                                                 joliet_level = 1;
  296                                         if (bcmp(sup->escape, "%/C", 3) == 0)
  297                                                 joliet_level = 2;
  298                                         if (bcmp(sup->escape, "%/E", 3) == 0)
  299                                                 joliet_level = 3;
  300 
  301                                         if ((isonum_711 (sup->flags) & 1) &&
  302                                             !vfs_flagopt(mp->mnt_optnew, "brokenjoliet", NULL, 0))
  303                                                 joliet_level = 0;
  304                                 }
  305                         }
  306                         break;
  307 
  308                 case ISO_VD_END:
  309                         goto vd_end;
  310 
  311                 default:
  312                         break;
  313                 }
  314                 if (bp != NULL) {
  315                         brelse(bp);
  316                         bp = NULL;
  317                 }
  318         }
  319  vd_end:
  320         if (bp != NULL) {
  321                 brelse(bp);
  322                 bp = NULL;
  323         }
  324 
  325         if (pri == NULL) {
  326                 error = EINVAL;
  327                 goto out;
  328         }
  329 
  330         logical_block_size =
  331                 isonum_723 (high_sierra?
  332                             pri_sierra->logical_block_size:
  333                             pri->logical_block_size);
  334 
  335         if (logical_block_size < DEV_BSIZE || logical_block_size > MAXBSIZE
  336             || (logical_block_size & (logical_block_size - 1)) != 0) {
  337                 error = EINVAL;
  338                 goto out;
  339         }
  340 
  341         rootp = (struct iso_directory_record *)
  342                 (high_sierra?
  343                  pri_sierra->root_directory_record:
  344                  pri->root_directory_record);
  345 
  346         isomp = malloc(sizeof *isomp, M_ISOFSMNT, M_WAITOK | M_ZERO);
  347         isomp->im_cp = cp;
  348         isomp->im_bo = bo;
  349         isomp->logical_block_size = logical_block_size;
  350         isomp->volume_space_size =
  351                 isonum_733 (high_sierra?
  352                             pri_sierra->volume_space_size:
  353                             pri->volume_space_size);
  354         isomp->joliet_level = 0;
  355         /*
  356          * Since an ISO9660 multi-session CD can also access previous
  357          * sessions, we have to include them into the space consider-
  358          * ations.  This doesn't yield a very accurate number since
  359          * parts of the old sessions might be inaccessible now, but we
  360          * can't do much better.  This is also important for the NFS
  361          * filehandle validation.
  362          */
  363         isomp->volume_space_size += ssector;
  364         memcpy(isomp->root, rootp, sizeof isomp->root);
  365         isomp->root_extent = isonum_733 (rootp->extent);
  366         isomp->root_size = isonum_733 (rootp->size);
  367 
  368         isomp->im_bmask = logical_block_size - 1;
  369         isomp->im_bshift = ffs(logical_block_size) - 1;
  370 
  371         pribp->b_flags |= B_AGE;
  372         brelse(pribp);
  373         pribp = NULL;
  374         rootp = NULL;
  375         pri = NULL;
  376         pri_sierra = NULL;
  377 
  378         mp->mnt_data = isomp;
  379         mp->mnt_stat.f_fsid.val[0] = dev2udev(dev);
  380         mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
  381         MNT_ILOCK(mp);
  382         if (isverified)
  383                 mp->mnt_flag |= MNT_VERIFIED;
  384         mp->mnt_flag |= MNT_LOCAL;
  385         mp->mnt_kern_flag |= MNTK_LOOKUP_SHARED | MNTK_EXTENDED_SHARED;
  386         MNT_IUNLOCK(mp);
  387         isomp->im_mountp = mp;
  388         isomp->im_dev = dev;
  389         isomp->im_devvp = devvp;
  390 
  391         vfs_flagopt(mp->mnt_optnew, "norrip", &isomp->im_flags, ISOFSMNT_NORRIP);
  392         vfs_flagopt(mp->mnt_optnew, "gens", &isomp->im_flags, ISOFSMNT_GENS);
  393         vfs_flagopt(mp->mnt_optnew, "extatt", &isomp->im_flags, ISOFSMNT_EXTATT);
  394         vfs_flagopt(mp->mnt_optnew, "nojoliet", &isomp->im_flags, ISOFSMNT_NOJOLIET);
  395         vfs_flagopt(mp->mnt_optnew, "kiconv", &isomp->im_flags, ISOFSMNT_KICONV);
  396 
  397         /* Check the Rock Ridge Extension support */
  398         if (!(isomp->im_flags & ISOFSMNT_NORRIP)) {
  399                 if ((error = bread(isomp->im_devvp, (isomp->root_extent +
  400                     isonum_711(((struct iso_directory_record *)isomp->root)->
  401                     ext_attr_length)) << (isomp->im_bshift - DEV_BSHIFT),
  402                     isomp->logical_block_size, NOCRED, &bp)) != 0)
  403                         goto out;
  404 
  405                 rootp = (struct iso_directory_record *)bp->b_data;
  406 
  407                 if ((isomp->rr_skip = cd9660_rrip_offset(rootp,isomp)) < 0) {
  408                     isomp->im_flags |= ISOFSMNT_NORRIP;
  409                 } else {
  410                     isomp->im_flags &= ~ISOFSMNT_GENS;
  411                 }
  412 
  413                 /*
  414                  * The contents are valid,
  415                  * but they will get reread as part of another vnode, so...
  416                  */
  417                 bp->b_flags |= B_AGE;
  418                 brelse(bp);
  419                 bp = NULL;
  420                 rootp = NULL;
  421         }
  422 
  423         if (isomp->im_flags & ISOFSMNT_KICONV && cd9660_iconv) {
  424                 cs_local = vfs_getopts(mp->mnt_optnew, "cs_local", &error);
  425                 if (error)
  426                         goto out;
  427                 cs_disk = vfs_getopts(mp->mnt_optnew, "cs_disk", &error);
  428                 if (error)
  429                         goto out;
  430                 cd9660_iconv->open(cs_local, cs_disk, &isomp->im_d2l);
  431                 cd9660_iconv->open(cs_disk, cs_local, &isomp->im_l2d);
  432         } else {
  433                 isomp->im_d2l = NULL;
  434                 isomp->im_l2d = NULL;
  435         }
  436 
  437         if (high_sierra) {
  438                 /* this effectively ignores all the mount flags */
  439                 if (bootverbose)
  440                         log(LOG_INFO, "cd9660: High Sierra Format\n");
  441                 isomp->iso_ftype = ISO_FTYPE_HIGH_SIERRA;
  442         } else
  443                 switch (isomp->im_flags&(ISOFSMNT_NORRIP|ISOFSMNT_GENS)) {
  444                   default:
  445                           isomp->iso_ftype = ISO_FTYPE_DEFAULT;
  446                           break;
  447                   case ISOFSMNT_GENS|ISOFSMNT_NORRIP:
  448                           isomp->iso_ftype = ISO_FTYPE_9660;
  449                           break;
  450                   case 0:
  451                           if (bootverbose)
  452                                   log(LOG_INFO, "cd9660: RockRidge Extension\n");
  453                           isomp->iso_ftype = ISO_FTYPE_RRIP;
  454                           break;
  455                 }
  456 
  457         /* Decide whether to use the Joliet descriptor */
  458 
  459         if (isomp->iso_ftype != ISO_FTYPE_RRIP && joliet_level) {
  460                 if (bootverbose)
  461                         log(LOG_INFO, "cd9660: Joliet Extension (Level %d)\n",
  462                             joliet_level);
  463                 rootp = (struct iso_directory_record *)
  464                         sup->root_directory_record;
  465                 memcpy(isomp->root, rootp, sizeof isomp->root);
  466                 isomp->root_extent = isonum_733 (rootp->extent);
  467                 isomp->root_size = isonum_733 (rootp->size);
  468                 isomp->joliet_level = joliet_level;
  469                 supbp->b_flags |= B_AGE;
  470         }
  471 
  472         if (supbp) {
  473                 brelse(supbp);
  474                 supbp = NULL;
  475                 sup = NULL;
  476         }
  477 
  478         return 0;
  479 out:
  480         if (bp != NULL)
  481                 brelse(bp);
  482         if (pribp != NULL)
  483                 brelse(pribp);
  484         if (supbp != NULL)
  485                 brelse(supbp);
  486         if (cp != NULL) {
  487                 g_topology_lock();
  488                 g_vfs_close(cp);
  489                 g_topology_unlock();
  490         }
  491         if (isomp) {
  492                 free(isomp, M_ISOFSMNT);
  493                 mp->mnt_data = NULL;
  494         }
  495         dev_rel(dev);
  496         return error;
  497 }
  498 
  499 /*
  500  * unmount system call
  501  */
  502 static int
  503 cd9660_unmount(mp, mntflags)
  504         struct mount *mp;
  505         int mntflags;
  506 {
  507         struct iso_mnt *isomp;
  508         int error, flags = 0;
  509 
  510         if (mntflags & MNT_FORCE)
  511                 flags |= FORCECLOSE;
  512         if ((error = vflush(mp, 0, flags, curthread)))
  513                 return (error);
  514 
  515         isomp = VFSTOISOFS(mp);
  516 
  517         if (isomp->im_flags & ISOFSMNT_KICONV && cd9660_iconv) {
  518                 if (isomp->im_d2l)
  519                         cd9660_iconv->close(isomp->im_d2l);
  520                 if (isomp->im_l2d)
  521                         cd9660_iconv->close(isomp->im_l2d);
  522         }
  523         g_topology_lock();
  524         g_vfs_close(isomp->im_cp);
  525         g_topology_unlock();
  526         vrele(isomp->im_devvp);
  527         dev_rel(isomp->im_dev);
  528         free(isomp, M_ISOFSMNT);
  529         mp->mnt_data = NULL;
  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)
  541         struct mount *mp;
  542         int flags;
  543         struct vnode **vpp;
  544 {
  545         struct iso_mnt *imp = VFSTOISOFS(mp);
  546         struct iso_directory_record *dp =
  547             (struct iso_directory_record *)imp->root;
  548         cd_ino_t ino = isodirino(dp, imp);
  549 
  550         /*
  551          * With RRIP we must use the `.' entry of the root directory.
  552          * Simply tell vget, that it's a relocated directory.
  553          */
  554         return (cd9660_vget_internal(mp, ino, flags, vpp,
  555             imp->iso_ftype == ISO_FTYPE_RRIP, dp));
  556 }
  557 
  558 /*
  559  * Get filesystem statistics.
  560  */
  561 static int
  562 cd9660_statfs(mp, sbp)
  563         struct mount *mp;
  564         struct statfs *sbp;
  565 {
  566         struct iso_mnt *isomp;
  567 
  568         isomp = VFSTOISOFS(mp);
  569 
  570         sbp->f_bsize = isomp->logical_block_size;
  571         sbp->f_iosize = sbp->f_bsize;   /* XXX */
  572         sbp->f_blocks = isomp->volume_space_size;
  573         sbp->f_bfree = 0; /* total free blocks */
  574         sbp->f_bavail = 0; /* blocks free for non superuser */
  575         sbp->f_files =  0; /* total files */
  576         sbp->f_ffree = 0; /* free file nodes */
  577         return 0;
  578 }
  579 
  580 /*
  581  * File handle to vnode
  582  *
  583  * Have to be really careful about stale file handles:
  584  * - check that the inode number is in range
  585  * - call iget() to get the locked inode
  586  * - check for an unallocated inode (i_mode == 0)
  587  * - check that the generation number matches
  588  */
  589 
  590 /* ARGSUSED */
  591 static int
  592 cd9660_fhtovp(mp, fhp, flags, vpp)
  593         struct mount *mp;
  594         struct fid *fhp;
  595         int flags;
  596         struct vnode **vpp;
  597 {
  598         struct ifid ifh;
  599         struct iso_node *ip;
  600         struct vnode *nvp;
  601         int error;
  602 
  603         memcpy(&ifh, fhp, sizeof(ifh));
  604 
  605 #ifdef  ISOFS_DBG
  606         printf("fhtovp: ino %d, start %ld\n",
  607             ifh.ifid_ino, ifh.ifid_start);
  608 #endif
  609 
  610         if ((error = VFS_VGET(mp, ifh.ifid_ino, LK_EXCLUSIVE, &nvp)) != 0) {
  611                 *vpp = NULLVP;
  612                 return (error);
  613         }
  614         ip = VTOI(nvp);
  615         if (ip->inode.iso_mode == 0) {
  616                 vput(nvp);
  617                 *vpp = NULLVP;
  618                 return (ESTALE);
  619         }
  620         *vpp = nvp;
  621         vnode_create_vobject(*vpp, ip->i_size, curthread);
  622         return (0);
  623 }
  624 
  625 /*
  626  * Conform to standard VFS interface; can't vget arbitrary inodes beyond 4GB
  627  * into media with current inode scheme and 32-bit ino_t.  This shouldn't be
  628  * needed for anything other than nfsd, and who exports a mounted DVD over NFS?
  629  */
  630 static int
  631 cd9660_vget(mp, ino, flags, vpp)
  632         struct mount *mp;
  633         ino_t ino;
  634         int flags;
  635         struct vnode **vpp;
  636 {
  637 
  638         /*
  639          * XXXX
  640          * It would be nice if we didn't always set the `relocated' flag
  641          * and force the extra read, but I don't want to think about fixing
  642          * that right now.
  643          */
  644         return (cd9660_vget_internal(mp, ino, flags, vpp,
  645 #if 0
  646             VFSTOISOFS(mp)->iso_ftype == ISO_FTYPE_RRIP,
  647 #else
  648             0,
  649 #endif
  650             (struct iso_directory_record *)0));
  651 }
  652 
  653 /* Use special comparator for full 64-bit ino comparison. */
  654 static int
  655 cd9660_vfs_hash_cmp(vp, pino)
  656         struct vnode *vp;
  657         void *pino;
  658 {
  659         struct iso_node *ip;
  660         cd_ino_t ino;
  661 
  662         ip = VTOI(vp);
  663         ino = *(cd_ino_t *)pino;
  664         return (ip->i_number != ino);
  665 }
  666 
  667 int
  668 cd9660_vget_internal(mp, ino, flags, vpp, relocated, isodir)
  669         struct mount *mp;
  670         cd_ino_t ino;
  671         int flags;
  672         struct vnode **vpp;
  673         int relocated;
  674         struct iso_directory_record *isodir;
  675 {
  676         struct iso_mnt *imp;
  677         struct iso_node *ip;
  678         struct buf *bp;
  679         struct vnode *vp;
  680         int error;
  681         struct thread *td;
  682 
  683         td = curthread;
  684         error = vfs_hash_get(mp, ino, flags, td, vpp, cd9660_vfs_hash_cmp,
  685             &ino);
  686         if (error || *vpp != NULL)
  687                 return (error);
  688 
  689         /*
  690          * We must promote to an exclusive lock for vnode creation.  This
  691          * can happen if lookup is passed LOCKSHARED.
  692          */
  693         if ((flags & LK_TYPE_MASK) == LK_SHARED) {
  694                 flags &= ~LK_TYPE_MASK;
  695                 flags |= LK_EXCLUSIVE;
  696         }
  697 
  698         /*
  699          * We do not lock vnode creation as it is believed to be too
  700          * expensive for such rare case as simultaneous creation of vnode
  701          * for same ino by different processes. We just allow them to race
  702          * and check later to decide who wins. Let the race begin!
  703          */
  704 
  705         imp = VFSTOISOFS(mp);
  706 
  707         /* Allocate a new vnode/iso_node. */
  708         if ((error = getnewvnode("isofs", mp, &cd9660_vnodeops, &vp)) != 0) {
  709                 *vpp = NULLVP;
  710                 return (error);
  711         }
  712         ip = malloc(sizeof(struct iso_node), M_ISOFSNODE,
  713             M_WAITOK | M_ZERO);
  714         vp->v_data = ip;
  715         ip->i_vnode = vp;
  716         ip->i_number = ino;
  717 
  718         lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL);
  719         error = insmntque(vp, mp);
  720         if (error != 0) {
  721                 free(ip, M_ISOFSNODE);
  722                 *vpp = NULLVP;
  723                 return (error);
  724         }
  725         error = vfs_hash_insert(vp, ino, flags, td, vpp, cd9660_vfs_hash_cmp,
  726             &ino);
  727         if (error || *vpp != NULL)
  728                 return (error);
  729 
  730         if (isodir == NULL) {
  731                 int lbn, off;
  732 
  733                 lbn = lblkno(imp, ino);
  734                 if (lbn >= imp->volume_space_size) {
  735                         vput(vp);
  736                         printf("fhtovp: lbn exceed volume space %d\n", lbn);
  737                         return (ESTALE);
  738                 }
  739 
  740                 off = blkoff(imp, ino);
  741                 if (off + ISO_DIRECTORY_RECORD_SIZE > imp->logical_block_size) {
  742                         vput(vp);
  743                         printf("fhtovp: crosses block boundary %d\n",
  744                                off + ISO_DIRECTORY_RECORD_SIZE);
  745                         return (ESTALE);
  746                 }
  747 
  748                 error = bread(imp->im_devvp,
  749                               lbn << (imp->im_bshift - DEV_BSHIFT),
  750                               imp->logical_block_size, NOCRED, &bp);
  751                 if (error) {
  752                         vput(vp);
  753                         printf("fhtovp: bread error %d\n",error);
  754                         return (error);
  755                 }
  756                 isodir = (struct iso_directory_record *)(bp->b_data + off);
  757 
  758                 if (off + isonum_711(isodir->length) >
  759                     imp->logical_block_size) {
  760                         vput(vp);
  761                         brelse(bp);
  762                         printf("fhtovp: directory crosses block boundary %d[off=%d/len=%d]\n",
  763                                off +isonum_711(isodir->length), off,
  764                                isonum_711(isodir->length));
  765                         return (ESTALE);
  766                 }
  767 
  768 #if 0
  769                 if (isonum_733(isodir->extent) +
  770                     isonum_711(isodir->ext_attr_length) != ifhp->ifid_start) {
  771                         brelse(bp);
  772                         printf("fhtovp: file start miss %d vs %d\n",
  773                                isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length),
  774                                ifhp->ifid_start);
  775                         return (ESTALE);
  776                 }
  777 #endif
  778         } else
  779                 bp = NULL;
  780 
  781         ip->i_mnt = imp;
  782 
  783         if (relocated) {
  784                 /*
  785                  * On relocated directories we must
  786                  * read the `.' entry out of a dir.
  787                  */
  788                 ip->iso_start = ino >> imp->im_bshift;
  789                 if (bp != NULL)
  790                         brelse(bp);
  791                 if ((error = cd9660_blkatoff(vp, (off_t)0, NULL, &bp)) != 0) {
  792                         vput(vp);
  793                         return (error);
  794                 }
  795                 isodir = (struct iso_directory_record *)bp->b_data;
  796         }
  797 
  798         ip->iso_extent = isonum_733(isodir->extent);
  799         ip->i_size = isonum_733(isodir->size);
  800         ip->iso_start = isonum_711(isodir->ext_attr_length) + ip->iso_extent;
  801 
  802         /*
  803          * Setup time stamp, attribute
  804          */
  805         vp->v_type = VNON;
  806         switch (imp->iso_ftype) {
  807         default:        /* ISO_FTYPE_9660 */
  808             {
  809                 struct buf *bp2;
  810                 int off;
  811                 if ((imp->im_flags & ISOFSMNT_EXTATT)
  812                     && (off = isonum_711(isodir->ext_attr_length)))
  813                         cd9660_blkatoff(vp, (off_t)-(off << imp->im_bshift), NULL,
  814                                      &bp2);
  815                 else
  816                         bp2 = NULL;
  817                 cd9660_defattr(isodir, ip, bp2, ISO_FTYPE_9660);
  818                 cd9660_deftstamp(isodir, ip, bp2, ISO_FTYPE_9660);
  819                 if (bp2)
  820                         brelse(bp2);
  821                 break;
  822             }
  823         case ISO_FTYPE_RRIP:
  824                 cd9660_rrip_analyze(isodir, ip, imp);
  825                 break;
  826         }
  827 
  828         brelse(bp);
  829 
  830         /*
  831          * Initialize the associated vnode
  832          */
  833         switch (vp->v_type = IFTOVT(ip->inode.iso_mode)) {
  834         case VFIFO:
  835                 vp->v_op = &cd9660_fifoops;
  836                 break;
  837         default:
  838                 VN_LOCK_ASHARE(vp);
  839                 break;
  840         }
  841 
  842         if (ip->iso_extent == imp->root_extent)
  843                 vp->v_vflag |= VV_ROOT;
  844 
  845         /*
  846          * XXX need generation number?
  847          */
  848 
  849         *vpp = vp;
  850         return (0);
  851 }

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