sys/vfs/isofs/cd9660/cd9660_vfsops.c

   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  * 3. All advertising materials mentioning features or use of this software
  19  *    must display the following acknowledgement:
  20  *      This product includes software developed by the University of
  21  *      California, Berkeley and its contributors.
  22  * 4. Neither the name of the University nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  *
  38  *      @(#)cd9660_vfsops.c     8.18 (Berkeley) 5/22/95
  39  * $FreeBSD: src/sys/isofs/cd9660/cd9660_vfsops.c,v 1.74.2.7 2002/04/08 09:39:29 bde Exp $
  40  * $DragonFly: src/sys/vfs/isofs/cd9660/cd9660_vfsops.c,v 1.45.4.1 2008/09/25 02:20:51 dillon Exp $
  41  */
  42
  43 #include <sys/param.h>
  44 #include <sys/systm.h>
  45 #include <sys/proc.h>
  46 #include <sys/nlookup.h>
  47 #include <sys/kernel.h>
  48 #include <sys/vnode.h>
  49 #include <sys/mount.h>
  50 #include <sys/buf.h>
  51 #include <sys/cdio.h>
  52 #include <sys/conf.h>
  53 #include <sys/fcntl.h>
  54 #include <sys/malloc.h>
  55 #include <sys/stat.h>
  56 #include <sys/syslog.h>
  57
  58 #include <vm/vm_zone.h>
  59
  60 #include "iso.h"
  61 #include "iso_rrip.h"
  62 #include "cd9660_node.h"
  63 #include "cd9660_mount.h"
  64
  65 extern struct vop_ops cd9660_vnode_vops;
  66 extern struct vop_ops cd9660_spec_vops;
  67 extern struct vop_ops cd9660_fifo_vops;
  68
  69 MALLOC_DEFINE(M_ISOFSMNT, "ISOFS mount", "ISOFS mount structure");
  70 MALLOC_DEFINE(M_ISOFSNODE, "ISOFS node", "ISOFS vnode private part");
  71
  72 static int cd9660_mount (struct mount *, char *, caddr_t, struct ucred *);
  73 static int cd9660_unmount (struct mount *, int);
  74 static int cd9660_root (struct mount *, struct vnode **);
  75 static int cd9660_statfs (struct mount *, struct statfs *, struct ucred *);
  76 static int cd9660_vget (struct mount *, ino_t, struct vnode **);
  77 static int cd9660_fhtovp (struct mount *, struct vnode *rootvp,
  78                                 struct fid *, struct vnode **);
  79 static int cd9660_checkexp (struct mount *, struct sockaddr *,
  80             int *, struct ucred **);
  81 static int cd9660_vptofh (struct vnode *, struct fid *);
  82
  83 static struct vfsops cd9660_vfsops = {
  84         .vfs_mount =            cd9660_mount,
  85         .vfs_unmount =          cd9660_unmount,
  86         .vfs_root =             cd9660_root,
  87         .vfs_statfs =           cd9660_statfs,
  88         .vfs_sync =             vfs_stdsync,
  89         .vfs_vget =             cd9660_vget,
  90         .vfs_fhtovp =           cd9660_fhtovp,
  91         .vfs_checkexp =         cd9660_checkexp,
  92         .vfs_vptofh =           cd9660_vptofh,
  93         .vfs_init =             cd9660_init,
  94         .vfs_uninit =           cd9660_uninit,
  95 };
  96 VFS_SET(cd9660_vfsops, cd9660, VFCF_READONLY);
  97 MODULE_VERSION(cd9660, 1);
  98
  99
 100 /*
 101  * Called by vfs_mountroot when iso is going to be mounted as root.
 102  */
 103
 104 static int iso_get_ssector (cdev_t dev);
 105 static int iso_mountfs (struct vnode *devvp, struct mount *mp,
 106                             struct iso_args *argp);
 107
 108 /*
 109  * Try to find the start of the last data track on this CD-ROM.  This
 110  * is used to mount the last session of a multi-session CD.  Bail out
 111  * and return 0 if we fail, this is always a safe bet.
 112  */
 113 static int
 114 iso_get_ssector(cdev_t dev)
 115 {
 116         struct ioc_toc_header h;
 117         struct ioc_read_toc_single_entry t;
 118         int i;
 119
 120         if (dev_dioctl(dev, CDIOREADTOCHEADER, (caddr_t)&h, FREAD, proc0.p_ucred) != 0)
 121                 return 0;
 122
 123         for (i = h.ending_track; i >= 0; i--) {
 124                 t.address_format = CD_LBA_FORMAT;
 125                 t.track = i;
 126                 if (dev_dioctl(dev, CDIOREADTOCENTRY, (caddr_t)&t, FREAD, proc0.p_ucred) != 0) {
 127                         return 0;
 128                 }
 129                 if ((t.entry.control & 4) != 0)
 130                         /* found a data track */
 131                         break;
 132         }
 133
 134         if (i < 0)
 135                 return 0;
 136
 137         return ntohl(t.entry.addr.lba);
 138 }
 139
 140 static int
 141 iso_mountroot(struct mount *mp)
 142 {
 143         struct iso_args args;
 144         struct vnode *rootvp;
 145         int error;
 146
 147         if ((error = bdevvp(rootdev, &rootvp))) {
 148                 kprintf("iso_mountroot: can't find rootvp\n");
 149                 return (error);
 150         }
 151         args.flags = ISOFSMNT_ROOT;
 152
 153         vn_lock(rootvp, LK_EXCLUSIVE | LK_RETRY);
 154         error = VOP_OPEN(rootvp, FREAD, FSCRED, NULL);
 155         vn_unlock(rootvp);
 156         if (error)
 157                 return (error);
 158
 159         args.ssector = iso_get_ssector(rootdev);
 160
 161         VOP_CLOSE(rootvp, FREAD);
 162
 163         if (bootverbose)
 164                 kprintf("iso_mountroot(): using session at block %d\n",
 165                        args.ssector);
 166         if ((error = iso_mountfs(rootvp, mp, &args)) != 0)
 167                 return (error);
 168
 169         cd9660_statfs(mp, &mp->mnt_stat, proc0.p_ucred);
 170         return (0);
 171 }
 172
 173 /*
 174  * VFS Operations.
 175  *
 176  * mount system call
 177  */
 178 static int
 179 cd9660_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred)
 180 {
 181         struct vnode *devvp;
 182         struct iso_args args;
 183         size_t size;
 184         int error;
 185         mode_t accessmode;
 186         struct iso_mnt *imp = 0;
 187         struct nlookupdata nd;
 188
 189         if ((mp->mnt_flag & (MNT_ROOTFS|MNT_UPDATE)) == MNT_ROOTFS) {
 190                 return (iso_mountroot(mp));
 191         }
 192         if ((error = copyin(data, (caddr_t)&args, sizeof (struct iso_args))))
 193                 return (error);
 194
 195         if ((mp->mnt_flag & MNT_RDONLY) == 0)
 196                 return (EROFS);
 197
 198         /*
 199          * If updating, check whether changing from read-only to
 200          * read/write; if there is no device name, that's all we do.
 201          */
 202         if (mp->mnt_flag & MNT_UPDATE) {
 203                 imp = VFSTOISOFS(mp);
 204                 if (args.fspec == 0)
 205                         return (vfs_export(mp, &imp->im_export, &args.export));
 206         }
 207         /*
 208          * Not an update, or updating the name: look up the name
 209          * and verify that it refers to a sensible block device.
 210          */
 211         devvp = NULL;
 212         error = nlookup_init(&nd, args.fspec, UIO_USERSPACE, NLC_FOLLOW);
 213         if (error == 0)
 214                 error = nlookup(&nd);
 215         if (error == 0)
 216                 error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp);
 217         nlookup_done(&nd);
 218         if (error)
 219                 return (error);
 220
 221         if (!vn_isdisk(devvp, &error)) {
 222                 vrele(devvp);
 223                 return (error);
 224         }
 225
 226         /*
 227          * Verify that user has necessary permissions on the device,
 228          * or has superuser abilities
 229          */
 230         accessmode = VREAD;
 231         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
 232         error = VOP_ACCESS(devvp, accessmode, cred);
 233         if (error)
 234                 error = suser_cred(cred, 0);
 235         if (error) {
 236                 vput(devvp);
 237                 return (error);
 238         }
 239         vn_unlock(devvp);
 240
 241         if ((mp->mnt_flag & MNT_UPDATE) == 0) {
 242                 error = iso_mountfs(devvp, mp, &args);
 243         } else {
 244                 if (devvp != imp->im_devvp)
 245                         error = EINVAL; /* needs translation */
 246                 else
 247                         vrele(devvp);
 248         }
 249         if (error) {
 250                 vrele(devvp);
 251                 return error;
 252         }
 253         imp = VFSTOISOFS(mp);
 254         copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
 255             &size);
 256         bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
 257         cd9660_statfs(mp, &mp->mnt_stat, cred);
 258         return 0;
 259 }
 260
 261 /*
 262  * Common code for mount and mountroot
 263  */
 264 static int
 265 iso_mountfs(struct vnode *devvp, struct mount *mp, struct iso_args *argp)
 266 {
 267         struct iso_mnt *isomp = NULL;
 268         struct buf *bp = NULL;
 269         struct buf *pribp = NULL, *supbp = NULL;
 270         cdev_t dev;
 271         int error = EINVAL;
 272         int needclose = 0;
 273         int high_sierra = 0;
 274         int iso_bsize;
 275         int iso_blknum;
 276         int joliet_level;
 277         struct iso_volume_descriptor *vdp = 0;
 278         struct iso_primary_descriptor *pri = NULL;
 279         struct iso_sierra_primary_descriptor *pri_sierra = NULL;
 280         struct iso_supplementary_descriptor *sup = NULL;
 281         struct iso_directory_record *rootp;
 282         int logical_block_size;
 283
 284         if (!(mp->mnt_flag & MNT_RDONLY))
 285                 return EROFS;
 286
 287         /*
 288          * Disallow multiple mounts of the same device.
 289          * Disallow mounting of a device that is currently in use
 290          * Flush out any old buffers remaining from a previous use.
 291          */
 292         if ((error = vfs_mountedon(devvp)))
 293                 return error;
 294         if (count_udev(devvp->v_umajor, devvp->v_uminor) > 0)
 295                 return EBUSY;
 296         if ((error = vinvalbuf(devvp, V_SAVE, 0, 0)))
 297                 return (error);
 298
 299         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
 300         error = VOP_OPEN(devvp, FREAD, FSCRED, NULL);
 301         vn_unlock(devvp);
 302         if (error)
 303                 return error;
 304         dev = devvp->v_rdev;
 305         if (dev->si_iosize_max != 0)
 306                 mp->mnt_iosize_max = dev->si_iosize_max;
 307         if (mp->mnt_iosize_max > MAXPHYS)
 308                 mp->mnt_iosize_max = MAXPHYS;
 309
 310         needclose = 1;
 311
 312         /* This is the "logical sector size".  The standard says this
 313          * should be 2048 or the physical sector size on the device,
 314          * whichever is greater.  For now, we'll just use a constant.
 315          */
 316         iso_bsize = ISO_DEFAULT_BLOCK_SIZE;
 317
 318         joliet_level = 0;
 319         for (iso_blknum = 16 + argp->ssector;
 320              iso_blknum < 100 + argp->ssector;
 321              iso_blknum++) {
 322                 if ((error = bread(devvp, (off_t)iso_blknum * iso_bsize,
 323                                   iso_bsize, &bp)) != 0)
 324                         goto out;
 325
 326                 vdp = (struct iso_volume_descriptor *)bp->b_data;
 327                 if (bcmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) != 0) {
 328                         if (bcmp (vdp->id_sierra, ISO_SIERRA_ID,
 329                                   sizeof vdp->id) != 0) {
 330                                 error = EINVAL;
 331                                 goto out;
 332                         } else
 333                                 high_sierra = 1;
 334                 }
 335                 switch (isonum_711 (high_sierra? vdp->type_sierra: vdp->type)){
 336                 case ISO_VD_PRIMARY:
 337                         if (pribp == NULL) {
 338                                 pribp = bp;
 339                                 bp = NULL;
 340                                 pri = (struct iso_primary_descriptor *)vdp;
 341                                 pri_sierra =
 342                                   (struct iso_sierra_primary_descriptor *)vdp;
 343                         }
 344                         break;
 345
 346                 case ISO_VD_SUPPLEMENTARY:
 347                         if (supbp == NULL) {
 348                                 supbp = bp;
 349                                 bp = NULL;
 350                                 sup = (struct iso_supplementary_descriptor *)vdp;
 351
 352                                 if (!(argp->flags & ISOFSMNT_NOJOLIET)) {
 353                                         if (bcmp(sup->escape, "%/@", 3) == 0)
 354                                                 joliet_level = 1;
 355                                         if (bcmp(sup->escape, "%/C", 3) == 0)
 356                                                 joliet_level = 2;
 357                                         if (bcmp(sup->escape, "%/E", 3) == 0)
 358                                                 joliet_level = 3;
 359
 360                                         if ((isonum_711 (sup->flags) & 1) &&
 361                                             (argp->flags & ISOFSMNT_BROKENJOLIET) == 0)
 362                                                 joliet_level = 0;
 363                                 }
 364                         }
 365                         break;
 366
 367                 case ISO_VD_END:
 368                         goto vd_end;
 369
 370                 default:
 371                         break;
 372                 }
 373                 if (bp) {
 374                         brelse(bp);
 375                         bp = NULL;
 376                 }
 377         }
 378  vd_end:
 379         if (bp) {
 380                 brelse(bp);
 381                 bp = NULL;
 382         }
 383
 384         if (pri == NULL) {
 385                 error = EINVAL;
 386                 goto out;
 387         }
 388
 389         logical_block_size =
 390                 isonum_723 (high_sierra?
 391                             pri_sierra->logical_block_size:
 392                             pri->logical_block_size);
 393
 394         if (logical_block_size < DEV_BSIZE || logical_block_size > MAXBSIZE
 395             || (logical_block_size & (logical_block_size - 1)) != 0) {
 396                 error = EINVAL;
 397                 goto out;
 398         }
 399
 400         rootp = (struct iso_directory_record *)
 401                 (high_sierra?
 402                  pri_sierra->root_directory_record:
 403                  pri->root_directory_record);
 404
 405         isomp = kmalloc(sizeof *isomp, M_ISOFSMNT, M_WAITOK | M_ZERO);
 406         isomp->logical_block_size = logical_block_size;
 407         isomp->volume_space_size =
 408                 isonum_733 (high_sierra?
 409                             pri_sierra->volume_space_size:
 410                             pri->volume_space_size);
 411         isomp->joliet_level = 0;
 412         /*
 413          * Since an ISO9660 multi-session CD can also access previous
 414          * sessions, we have to include them into the space consider-
 415          * ations.  This doesn't yield a very accurate number since
 416          * parts of the old sessions might be inaccessible now, but we
 417          * can't do much better.  This is also important for the NFS
 418          * filehandle validation.
 419          */
 420         isomp->volume_space_size += argp->ssector;
 421         bcopy (rootp, isomp->root, sizeof isomp->root);
 422         isomp->root_extent = isonum_733 (rootp->extent);
 423         isomp->root_size = isonum_733 (rootp->size);
 424
 425         isomp->im_bmask = logical_block_size - 1;
 426         isomp->im_bshift = ffs(logical_block_size) - 1;
 427
 428         pribp->b_flags |= B_AGE;
 429         brelse(pribp);
 430         pribp = NULL;
 431
 432         mp->mnt_data = (qaddr_t)isomp;
 433         mp->mnt_stat.f_fsid.val[0] = dev2udev(dev);
 434         mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
 435         mp->mnt_maxsymlinklen = 0;
 436         mp->mnt_flag |= MNT_LOCAL;
 437         isomp->im_mountp = mp;
 438         isomp->im_dev = dev;
 439         isomp->im_devvp = devvp;
 440
 441         dev->si_mountpoint = mp;
 442
 443         /* Check the Rock Ridge Extention support */
 444         if (!(argp->flags & ISOFSMNT_NORRIP)) {
 445                 if ((error = bread(isomp->im_devvp,
 446                                   lblktooff(isomp, isomp->root_extent + isonum_711(rootp->ext_attr_length)),
 447                                   isomp->logical_block_size, &bp)) != 0)
 448                     goto out;
 449
 450                 rootp = (struct iso_directory_record *)bp->b_data;
 451
 452                 if ((isomp->rr_skip = cd9660_rrip_offset(rootp,isomp)) < 0) {
 453                     argp->flags  |= ISOFSMNT_NORRIP;
 454                 } else {
 455                     argp->flags  &= ~ISOFSMNT_GENS;
 456                 }
 457
 458                 /*
 459                  * The contents are valid,
 460                  * but they will get reread as part of another vnode, so...
 461                  */
 462                 bp->b_flags |= B_AGE;
 463                 brelse(bp);
 464                 bp = NULL;
 465         }
 466         isomp->im_flags = argp->flags & (ISOFSMNT_NORRIP | ISOFSMNT_GENS |
 467                                          ISOFSMNT_EXTATT | ISOFSMNT_NOJOLIET);
 468
 469         if (high_sierra) {
 470                 /* this effectively ignores all the mount flags */
 471                 log(LOG_INFO, "cd9660: High Sierra Format\n");
 472                 isomp->iso_ftype = ISO_FTYPE_HIGH_SIERRA;
 473         } else {
 474                 switch (isomp->im_flags&(ISOFSMNT_NORRIP|ISOFSMNT_GENS)) {
 475                   default:
 476                           isomp->iso_ftype = ISO_FTYPE_DEFAULT;
 477                           break;
 478                   case ISOFSMNT_GENS|ISOFSMNT_NORRIP:
 479                           isomp->iso_ftype = ISO_FTYPE_9660;
 480                           break;
 481                   case 0:
 482                           log(LOG_INFO, "cd9660: RockRidge Extension\n");
 483                           isomp->iso_ftype = ISO_FTYPE_RRIP;
 484                           break;
 485                 }
 486         }
 487
 488         /* Decide whether to use the Joliet descriptor */
 489
 490         if (isomp->iso_ftype != ISO_FTYPE_RRIP && joliet_level) {
 491                 log(LOG_INFO, "cd9660: Joliet Extension (Level %d)\n", joliet_level);
 492                 rootp = (struct iso_directory_record *)
 493                         sup->root_directory_record;
 494                 bcopy (rootp, isomp->root, sizeof isomp->root);
 495                 isomp->root_extent = isonum_733 (rootp->extent);
 496                 isomp->root_size = isonum_733 (rootp->size);
 497                 isomp->joliet_level = joliet_level;
 498                 supbp->b_flags |= B_AGE;
 499         }
 500
 501         if (supbp) {
 502                 brelse(supbp);
 503                 supbp = NULL;
 504         }
 505
 506         vfs_add_vnodeops(mp, &cd9660_vnode_vops, &mp->mnt_vn_norm_ops);
 507         vfs_add_vnodeops(mp, &cd9660_spec_vops, &mp->mnt_vn_spec_ops);
 508         vfs_add_vnodeops(mp, &cd9660_fifo_vops, &mp->mnt_vn_fifo_ops);
 509
 510         return 0;
 511 out:
 512         dev->si_mountpoint = NULL;
 513         if (bp)
 514                 brelse(bp);
 515         if (pribp)
 516                 brelse(pribp);
 517         if (supbp)
 518                 brelse(supbp);
 519         if (needclose)
 520                 VOP_CLOSE(devvp, FREAD);
 521         if (isomp) {
 522                 kfree((caddr_t)isomp, M_ISOFSMNT);
 523                 mp->mnt_data = (qaddr_t)0;
 524         }
 525         return error;
 526 }
 527
 528 /*
 529  * unmount system call
 530  */
 531 static int
 532 cd9660_unmount(struct mount *mp, int mntflags)
 533 {
 534         struct iso_mnt *isomp;
 535         int error, flags = 0;
 536
 537         if (mntflags & MNT_FORCE)
 538                 flags |= FORCECLOSE;
 539 #if 0
 540         mntflushbuf(mp, 0);
 541         if (mntinvalbuf(mp))
 542                 return EBUSY;
 543 #endif
 544         if ((error = vflush(mp, 0, flags)))
 545                 return (error);
 546
 547         isomp = VFSTOISOFS(mp);
 548
 549         isomp->im_devvp->v_rdev->si_mountpoint = NULL;
 550         error = VOP_CLOSE(isomp->im_devvp, FREAD);
 551         vrele(isomp->im_devvp);
 552         kfree((caddr_t)isomp, M_ISOFSMNT);
 553         mp->mnt_data = (qaddr_t)0;
 554         mp->mnt_flag &= ~MNT_LOCAL;
 555         return (error);
 556 }
 557
 558 /*
 559  * Return root of a filesystem
 560  */
 561 static int
 562 cd9660_root(struct mount *mp, struct vnode **vpp)
 563 {
 564         struct iso_mnt *imp = VFSTOISOFS(mp);
 565         struct iso_directory_record *dp =
 566             (struct iso_directory_record *)imp->root;
 567         ino_t ino = isodirino(dp, imp);
 568
 569         /*
 570          * With RRIP we must use the `.' entry of the root directory.
 571          * Simply tell vget, that it's a relocated directory.
 572          */
 573         return (cd9660_vget_internal(mp, ino, vpp,
 574             imp->iso_ftype == ISO_FTYPE_RRIP, dp));
 575 }
 576
 577 /*
 578  * Get file system statistics.
 579  */
 580 int
 581 cd9660_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
 582 {
 583         struct iso_mnt *isomp;
 584
 585         isomp = VFSTOISOFS(mp);
 586
 587         sbp->f_bsize = isomp->logical_block_size;
 588         sbp->f_iosize = sbp->f_bsize;   /* XXX */
 589         sbp->f_blocks = isomp->volume_space_size;
 590         sbp->f_bfree = 0; /* total free blocks */
 591         sbp->f_bavail = 0; /* blocks free for non superuser */
 592         sbp->f_files =  0; /* total files */
 593         sbp->f_ffree = 0; /* free file nodes */
 594         if (sbp != &mp->mnt_stat) {
 595                 sbp->f_type = mp->mnt_vfc->vfc_typenum;
 596                 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
 597         }
 598         return 0;
 599 }
 600
 601 /*
 602  * File handle to vnode
 603  *
 604  * Have to be really careful about stale file handles:
 605  * - check that the inode number is in range
 606  * - call iget() to get the locked inode
 607  * - check for an unallocated inode (i_mode == 0)
 608  * - check that the generation number matches
 609  */
 610
 611 struct ifid {
 612         ushort  ifid_len;
 613         ushort  ifid_pad;
 614         int     ifid_ino;
 615         long    ifid_start;
 616 };
 617
 618 /* ARGSUSED */
 619 int
 620 cd9660_fhtovp(struct mount *mp, struct vnode *rootvp,
 621               struct fid *fhp, struct vnode **vpp)
 622 {
 623         struct ifid *ifhp = (struct ifid *)fhp;
 624         struct iso_node *ip;
 625         struct vnode *nvp;
 626         int error;
 627
 628 #ifdef  ISOFS_DBG
 629         kprintf("fhtovp: ino %d, start %ld\n",
 630                ifhp->ifid_ino, ifhp->ifid_start);
 631 #endif
 632
 633         if ((error = VFS_VGET(mp, ifhp->ifid_ino, &nvp)) != 0) {
 634                 *vpp = NULLVP;
 635                 return (error);
 636         }
 637         ip = VTOI(nvp);
 638         if (ip->inode.iso_mode == 0) {
 639                 vput(nvp);
 640                 *vpp = NULLVP;
 641                 return (ESTALE);
 642         }
 643         *vpp = nvp;
 644         return (0);
 645 }
 646
 647 int
 648 cd9660_checkexp(struct mount *mp, struct sockaddr *nam, int *exflagsp,
 649                 struct ucred **credanonp)
 650 {
 651         struct netcred *np;
 652         struct iso_mnt *imp;
 653
 654         imp = VFSTOISOFS(mp);
 655
 656         /*
 657          * Get the export permission structure for this <mp, client> tuple.
 658          */
 659         np = vfs_export_lookup(mp, &imp->im_export, nam);
 660         if (np == NULL)
 661                 return (EACCES);
 662
 663         *exflagsp = np->netc_exflags;
 664         *credanonp = &np->netc_anon;
 665         return (0);
 666 }
 667
 668 int
 669 cd9660_vget(struct mount *mp, ino_t ino, struct vnode **vpp)
 670 {
 671
 672         /*
 673          * XXXX
 674          * It would be nice if we didn't always set the `relocated' flag
 675          * and force the extra read, but I don't want to think about fixing
 676          * that right now.
 677          */
 678         return (cd9660_vget_internal(mp, ino, vpp,
 679 #if 0
 680             VFSTOISOFS(mp)->iso_ftype == ISO_FTYPE_RRIP,
 681 #else
 682             0,
 683 #endif
 684             (struct iso_directory_record *)0));
 685 }
 686
 687 int
 688 cd9660_vget_internal(struct mount *mp, ino_t ino, struct vnode **vpp,
 689                      int relocated, struct iso_directory_record *isodir)
 690 {
 691         struct iso_mnt *imp;
 692         struct iso_node *ip;
 693         struct buf *bp;
 694         struct vnode *vp;
 695         cdev_t dev;
 696         int error;
 697
 698         imp = VFSTOISOFS(mp);
 699         dev = imp->im_dev;
 700 again:
 701         if ((*vpp = cd9660_ihashget(dev, ino)) != NULLVP)
 702                 return (0);
 703
 704         /* Allocate a new vnode/iso_node. */
 705         error = getnewvnode(VT_ISOFS, mp, &vp, 0, 0);
 706         if (error) {
 707                 *vpp = NULLVP;
 708                 return (error);
 709         }
 710         MALLOC(ip, struct iso_node *, sizeof(struct iso_node), M_ISOFSNODE,
 711             M_WAITOK | M_ZERO);
 712         ip->i_vnode = vp;
 713         ip->i_dev = dev;
 714         ip->i_number = ino;
 715
 716         /*
 717          * Insert it into the inode hash table and check for a collision.
 718          * If a collision occurs, throw away the vnode and try again.
 719          */
 720         if (cd9660_ihashins(ip) != 0) {
 721                 kprintf("debug: cd9660 ihashins collision, retrying\n");
 722                 vx_put(vp);
 723                 kfree(ip, M_ISOFSNODE);
 724                 goto again;
 725         }
 726         vp->v_data = ip;
 727
 728         if (isodir == NULL) {
 729                 int lbn, off;
 730
 731                 lbn = lblkno(imp, ino);
 732                 if (lbn >= imp->volume_space_size) {
 733                         vx_put(vp);
 734                         kprintf("fhtovp: lbn exceed volume space %d\n", lbn);
 735                         return (ESTALE);
 736                 }
 737
 738                 off = blkoff(imp, ino);
 739                 if (off + ISO_DIRECTORY_RECORD_SIZE > imp->logical_block_size) {
 740                         vx_put(vp);
 741                         kprintf("fhtovp: crosses block boundary %d\n",
 742                                off + ISO_DIRECTORY_RECORD_SIZE);
 743                         return (ESTALE);
 744                 }
 745
 746                 error = bread(imp->im_devvp,
 747                               lblktooff(imp, lbn),
 748                               imp->logical_block_size, &bp);
 749                 if (error) {
 750                         vx_put(vp);
 751                         brelse(bp);
 752                         kprintf("fhtovp: bread error %d\n",error);
 753                         return (error);
 754                 }
 755                 isodir = (struct iso_directory_record *)(bp->b_data + off);
 756
 757                 if (off + isonum_711(isodir->length) >
 758                     imp->logical_block_size) {
 759                         vx_put(vp);
 760                         if (bp != NULL)
 761                                 brelse(bp);
 762                         kprintf("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                         if (bp != NULL)
 772                                 brelse(bp);
 773                         kprintf("fhtovp: file start miss %d vs %d\n",
 774                                isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length),
 775                                ifhp->ifid_start);
 776                         return (ESTALE);
 777                 }
 778 #endif
 779         } else
 780                 bp = 0;
 781
 782         ip->i_mnt = imp;
 783         ip->i_devvp = imp->im_devvp;
 784         vref(ip->i_devvp);
 785
 786         if (relocated) {
 787                 /*
 788                  * On relocated directories we must
 789                  * read the `.' entry out of a dir.
 790                  */
 791                 ip->iso_start = ino >> imp->im_bshift;
 792                 if (bp != NULL)
 793                         brelse(bp);
 794                 if ((error = cd9660_devblkatoff(vp, (off_t)0, NULL, &bp)) != 0) {
 795                         vx_put(vp);
 796                         return (error);
 797                 }
 798                 isodir = (struct iso_directory_record *)bp->b_data;
 799         }
 800
 801         ip->iso_extent = isonum_733(isodir->extent);
 802         ip->i_size = isonum_733(isodir->size);
 803         ip->iso_start = isonum_711(isodir->ext_attr_length) + ip->iso_extent;
 804
 805         /*
 806          * Setup time stamp, attribute
 807          */
 808         vp->v_type = VNON;
 809         switch (imp->iso_ftype) {
 810         default:        /* ISO_FTYPE_9660 */
 811             {
 812                 struct buf *bp2;
 813                 int off;
 814                 if ((imp->im_flags & ISOFSMNT_EXTATT)
 815                     && (off = isonum_711(isodir->ext_attr_length)))
 816                         cd9660_devblkatoff(vp, (off_t)-(off << imp->im_bshift), NULL,
 817                                      &bp2);
 818                 else
 819                         bp2 = NULL;
 820                 cd9660_defattr(isodir, ip, bp2, ISO_FTYPE_9660);
 821                 cd9660_deftstamp(isodir, ip, bp2, ISO_FTYPE_9660);
 822                 if (bp2)
 823                         brelse(bp2);
 824                 break;
 825             }
 826         case ISO_FTYPE_RRIP:
 827                 cd9660_rrip_analyze(isodir, ip, imp);
 828                 break;
 829         }
 830
 831         if (bp != NULL)
 832                 brelse(bp);
 833
 834         /*
 835          * Initialize the associated vnode
 836          */
 837         vp->v_type = IFTOVT(ip->inode.iso_mode);
 838
 839         switch (vp->v_type) {
 840         case VFIFO:
 841                 vp->v_ops = &mp->mnt_vn_fifo_ops;
 842                 break;
 843         case VCHR:
 844         case VBLK:
 845                 vp->v_ops = &mp->mnt_vn_spec_ops;
 846                 addaliasu(vp, umajor(ip->inode.iso_rdev),
 847                           uminor(ip->inode.iso_rdev));
 848                 break;
 849         case VREG:
 850         case VDIR:
 851                 vinitvmio(vp, ip->i_size);
 852                 break;
 853         default:
 854                 break;
 855         }
 856
 857         if (ip->iso_extent == imp->root_extent)
 858                 vp->v_flag |= VROOT;
 859
 860         /*
 861          * Return the locked and refd vp
 862          */
 863         *vpp = vp;
 864         return (0);
 865 }
 866
 867 /*
 868  * Vnode pointer to File handle
 869  */
 870 /* ARGSUSED */
 871 int
 872 cd9660_vptofh(struct vnode *vp, struct fid *fhp)
 873 {
 874         struct iso_node *ip = VTOI(vp);
 875         struct ifid *ifhp;
 876
 877         ifhp = (struct ifid *)fhp;
 878         ifhp->ifid_len = sizeof(struct ifid);
 879
 880         ifhp->ifid_ino = ip->i_number;
 881         ifhp->ifid_start = ip->iso_start;
 882
 883 #ifdef  ISOFS_DBG
 884         kprintf("vptofh: ino %d, start %ld\n",
 885                ifhp->ifid_ino,ifhp->ifid_start);
 886 #endif
 887         return 0;
 888 }