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 1.46 2008/09/17 21:44:23 dillon Exp $
  41  */
  42
  43 #include <sys/param.h>
  44 #include <sys/systm.h>
  45 #include <sys/proc.h>
  46 #include <sys/priv.h>
  47 #include <sys/nlookup.h>
  48 #include <sys/kernel.h>
  49 #include <sys/vnode.h>
  50 #include <sys/mount.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
  59 #include <vm/vm_zone.h>
  60
  61 #include "iso.h"
  62 #include "iso_rrip.h"
  63 #include "cd9660_node.h"
  64 #include "cd9660_mount.h"
  65
  66 extern struct vop_ops cd9660_vnode_vops;
  67 extern struct vop_ops cd9660_spec_vops;
  68 extern struct vop_ops cd9660_fifo_vops;
  69
  70 MALLOC_DEFINE(M_ISOFSMNT, "ISOFS mount", "ISOFS mount structure");
  71 MALLOC_DEFINE(M_ISOFSNODE, "ISOFS node", "ISOFS vnode private part");
  72
  73 static int cd9660_mount (struct mount *, char *, caddr_t, struct ucred *);
  74 static int cd9660_unmount (struct mount *, int);
  75 static int cd9660_root (struct mount *, struct vnode **);
  76 static int cd9660_statfs (struct mount *, struct statfs *, struct ucred *);
  77 static int cd9660_vget (struct mount *, struct vnode *, ino_t, struct vnode **);
  78 static int cd9660_fhtovp (struct mount *, struct vnode *rootvp,
  79                                 struct fid *, struct vnode **);
  80 static int cd9660_checkexp (struct mount *, struct sockaddr *,
  81             int *, struct ucred **);
  82 static int cd9660_vptofh (struct vnode *, struct fid *);
  83
  84 static struct vfsops cd9660_vfsops = {
  85         .vfs_mount =            cd9660_mount,
  86         .vfs_unmount =          cd9660_unmount,
  87         .vfs_root =             cd9660_root,
  88         .vfs_statfs =           cd9660_statfs,
  89         .vfs_sync =             vfs_stdsync,
  90         .vfs_vget =             cd9660_vget,
  91         .vfs_fhtovp =           cd9660_fhtovp,
  92         .vfs_checkexp =         cd9660_checkexp,
  93         .vfs_vptofh =           cd9660_vptofh,
  94         .vfs_init =             cd9660_init,
  95         .vfs_uninit =           cd9660_uninit,
  96 };
  97 VFS_SET(cd9660_vfsops, cd9660, VFCF_READONLY);
  98 MODULE_VERSION(cd9660, 1);
  99
 100
 101 /*
 102  * Called by vfs_mountroot when iso is going to be mounted as root.
 103  */
 104
 105 static int iso_get_ssector (cdev_t dev);
 106 static int iso_mountfs (struct vnode *devvp, struct mount *mp,
 107                             struct iso_args *argp);
 108
 109 /*
 110  * Try to find the start of the last data track on this CD-ROM.  This
 111  * is used to mount the last session of a multi-session CD.  Bail out
 112  * and return 0 if we fail, this is always a safe bet.
 113  */
 114 static int
 115 iso_get_ssector(cdev_t dev)
 116 {
 117         struct ioc_toc_header h;
 118         struct ioc_read_toc_single_entry t;
 119         int i;
 120
 121         if (dev_dioctl(dev, CDIOREADTOCHEADER, (caddr_t)&h, FREAD,
 122                        proc0.p_ucred, NULL) != 0)
 123                 return 0;
 124
 125         for (i = h.ending_track; i >= 0; i--) {
 126                 t.address_format = CD_LBA_FORMAT;
 127                 t.track = i;
 128                 if (dev_dioctl(dev, CDIOREADTOCENTRY, (caddr_t)&t, FREAD,
 129                                proc0.p_ucred, NULL) != 0) {
 130                         return 0;
 131                 }
 132                 if ((t.entry.control & 4) != 0)
 133                         /* found a data track */
 134                         break;
 135         }
 136
 137         if (i < 0)
 138                 return 0;
 139
 140         return ntohl(t.entry.addr.lba);
 141 }
 142
 143 static int
 144 iso_mountroot(struct mount *mp)
 145 {
 146         struct iso_args args;
 147         struct vnode *rootvp;
 148         int error;
 149
 150         if ((error = bdevvp(rootdev, &rootvp))) {
 151                 kprintf("iso_mountroot: can't find rootvp\n");
 152                 return (error);
 153         }
 154         args.flags = ISOFSMNT_ROOT;
 155
 156         vn_lock(rootvp, LK_EXCLUSIVE | LK_RETRY);
 157         error = VOP_OPEN(rootvp, FREAD, FSCRED, NULL);
 158         vn_unlock(rootvp);
 159         if (error)
 160                 return (error);
 161
 162         args.ssector = iso_get_ssector(rootdev);
 163
 164         VOP_CLOSE(rootvp, FREAD);
 165
 166         if (bootverbose)
 167                 kprintf("iso_mountroot(): using session at block %d\n",
 168                        args.ssector);
 169         if ((error = iso_mountfs(rootvp, mp, &args)) != 0)
 170                 return (error);
 171
 172         cd9660_statfs(mp, &mp->mnt_stat, proc0.p_ucred);
 173         return (0);
 174 }
 175
 176 /*
 177  * VFS Operations.
 178  *
 179  * mount system call
 180  */
 181 static int
 182 cd9660_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred)
 183 {
 184         struct vnode *devvp;
 185         struct iso_args args;
 186         size_t size;
 187         int error;
 188         mode_t accessmode;
 189         struct iso_mnt *imp = 0;
 190         struct nlookupdata nd;
 191
 192         if ((mp->mnt_flag & (MNT_ROOTFS|MNT_UPDATE)) == MNT_ROOTFS) {
 193                 return (iso_mountroot(mp));
 194         }
 195         if ((error = copyin(data, (caddr_t)&args, sizeof (struct iso_args))))
 196                 return (error);
 197
 198         if ((mp->mnt_flag & MNT_RDONLY) == 0)
 199                 return (EROFS);
 200
 201         /*
 202          * If updating, check whether changing from read-only to
 203          * read/write; if there is no device name, that's all we do.
 204          */
 205         if (mp->mnt_flag & MNT_UPDATE) {
 206                 imp = VFSTOISOFS(mp);
 207                 if (args.fspec == 0)
 208                         return (vfs_export(mp, &imp->im_export, &args.export));
 209         }
 210         /*
 211          * Not an update, or updating the name: look up the name
 212          * and verify that it refers to a sensible block device.
 213          */
 214         devvp = NULL;
 215         error = nlookup_init(&nd, args.fspec, UIO_USERSPACE, NLC_FOLLOW);
 216         if (error == 0)
 217                 error = nlookup(&nd);
 218         if (error == 0)
 219                 error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp);
 220         nlookup_done(&nd);
 221         if (error)
 222                 return (error);
 223
 224         if (!vn_isdisk(devvp, &error)) {
 225                 vrele(devvp);
 226                 return (error);
 227         }
 228
 229         /*
 230          * Verify that user has necessary permissions on the device,
 231          * or has superuser abilities
 232          */
 233         accessmode = VREAD;
 234         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
 235         error = VOP_ACCESS(devvp, accessmode, cred);
 236         if (error)
 237                 error = priv_check_cred(cred, PRIV_ROOT, 0);
 238         if (error) {
 239                 vput(devvp);
 240                 return (error);
 241         }
 242         vn_unlock(devvp);
 243
 244         if ((mp->mnt_flag & MNT_UPDATE) == 0) {
 245                 error = iso_mountfs(devvp, mp, &args);
 246         } else {
 247                 if (devvp != imp->im_devvp)
 248                         error = EINVAL; /* needs translation */
 249                 else
 250                         vrele(devvp);
 251         }
 252         if (error) {
 253                 vrele(devvp);
 254                 return error;
 255         }
 256         imp = VFSTOISOFS(mp);
 257         copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
 258             &size);
 259         bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
 260         cd9660_statfs(mp, &mp->mnt_stat, cred);
 261         return 0;
 262 }
 263
 264 /*
 265  * Common code for mount and mountroot
 266  */
 267 static int
 268 iso_mountfs(struct vnode *devvp, struct mount *mp, struct iso_args *argp)
 269 {
 270         struct iso_mnt *isomp = NULL;
 271         struct buf *bp = NULL;
 272         struct buf *pribp = NULL, *supbp = NULL;
 273         cdev_t dev;
 274         int error = EINVAL;
 275         int needclose = 0;
 276         int high_sierra = 0;
 277         int iso_bsize;
 278         int iso_blknum;
 279         int joliet_level;
 280         struct iso_volume_descriptor *vdp = 0;
 281         struct iso_primary_descriptor *pri = NULL;
 282         struct iso_sierra_primary_descriptor *pri_sierra = NULL;
 283         struct iso_supplementary_descriptor *sup = NULL;
 284         struct iso_directory_record *rootp;
 285         int logical_block_size;
 286
 287         if (!(mp->mnt_flag & MNT_RDONLY))
 288                 return EROFS;
 289
 290         /*
 291          * Disallow multiple mounts of the same device.
 292          * Disallow mounting of a device that is currently in use
 293          * Flush out any old buffers remaining from a previous use.
 294          */
 295         if ((error = vfs_mountedon(devvp)))
 296                 return error;
 297         if (vcount(devvp) > 0)
 298                 return EBUSY;
 299         if ((error = vinvalbuf(devvp, V_SAVE, 0, 0)))
 300                 return (error);
 301
 302         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
 303         error = VOP_OPEN(devvp, FREAD, FSCRED, NULL);
 304         vn_unlock(devvp);
 305         if (error)
 306                 return error;
 307         dev = devvp->v_rdev;
 308         if (dev->si_iosize_max != 0)
 309                 mp->mnt_iosize_max = dev->si_iosize_max;
 310         if (mp->mnt_iosize_max > MAXPHYS)
 311                 mp->mnt_iosize_max = MAXPHYS;
 312
 313         needclose = 1;
 314
 315         /* This is the "logical sector size".  The standard says this
 316          * should be 2048 or the physical sector size on the device,
 317          * whichever is greater.  For now, we'll just use a constant.
 318          */
 319         iso_bsize = ISO_DEFAULT_BLOCK_SIZE;
 320
 321         joliet_level = 0;
 322         for (iso_blknum = 16 + argp->ssector;
 323              iso_blknum < 100 + argp->ssector;
 324              iso_blknum++) {
 325                 if ((error = bread(devvp, (off_t)iso_blknum * iso_bsize,
 326                                   iso_bsize, &bp)) != 0)
 327                         goto out;
 328
 329                 vdp = (struct iso_volume_descriptor *)bp->b_data;
 330                 if (bcmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) != 0) {
 331                         if (bcmp (vdp->id_sierra, ISO_SIERRA_ID,
 332                                   sizeof vdp->id) != 0) {
 333                                 error = EINVAL;
 334                                 goto out;
 335                         } else
 336                                 high_sierra = 1;
 337                 }
 338                 switch (isonum_711 (high_sierra? vdp->type_sierra: vdp->type)){
 339                 case ISO_VD_PRIMARY:
 340                         if (pribp == NULL) {
 341                                 pribp = bp;
 342                                 bp = NULL;
 343                                 pri = (struct iso_primary_descriptor *)vdp;
 344                                 pri_sierra =
 345                                   (struct iso_sierra_primary_descriptor *)vdp;
 346                         }
 347                         break;
 348
 349                 case ISO_VD_SUPPLEMENTARY:
 350                         if (supbp == NULL) {
 351                                 supbp = bp;
 352                                 bp = NULL;
 353                                 sup = (struct iso_supplementary_descriptor *)vdp;
 354
 355                                 if (!(argp->flags & ISOFSMNT_NOJOLIET)) {
 356                                         if (bcmp(sup->escape, "%/@", 3) == 0)
 357                                                 joliet_level = 1;
 358                                         if (bcmp(sup->escape, "%/C", 3) == 0)
 359                                                 joliet_level = 2;
 360                                         if (bcmp(sup->escape, "%/E", 3) == 0)
 361                                                 joliet_level = 3;
 362
 363                                         if ((isonum_711 (sup->flags) & 1) &&
 364                                             (argp->flags & ISOFSMNT_BROKENJOLIET) == 0)
 365                                                 joliet_level = 0;
 366                                 }
 367                         }
 368                         break;
 369
 370                 case ISO_VD_END:
 371                         goto vd_end;
 372
 373                 default:
 374                         break;
 375                 }
 376                 if (bp) {
 377                         brelse(bp);
 378                         bp = NULL;
 379                 }
 380         }
 381  vd_end:
 382         if (bp) {
 383                 brelse(bp);
 384                 bp = NULL;
 385         }
 386
 387         if (pri == NULL) {
 388                 error = EINVAL;
 389                 goto out;
 390         }
 391
 392         logical_block_size =
 393                 isonum_723 (high_sierra?
 394                             pri_sierra->logical_block_size:
 395                             pri->logical_block_size);
 396
 397         if (logical_block_size < DEV_BSIZE || logical_block_size > MAXBSIZE
 398             || (logical_block_size & (logical_block_size - 1)) != 0) {
 399                 error = EINVAL;
 400                 goto out;
 401         }
 402
 403         rootp = (struct iso_directory_record *)
 404                 (high_sierra?
 405                  pri_sierra->root_directory_record:
 406                  pri->root_directory_record);
 407
 408         isomp = kmalloc(sizeof *isomp, M_ISOFSMNT, M_WAITOK | M_ZERO);
 409         isomp->logical_block_size = logical_block_size;
 410         isomp->volume_space_size =
 411                 isonum_733 (high_sierra?
 412                             pri_sierra->volume_space_size:
 413                             pri->volume_space_size);
 414         isomp->joliet_level = 0;
 415         /*
 416          * Since an ISO9660 multi-session CD can also access previous
 417          * sessions, we have to include them into the space consider-
 418          * ations.  This doesn't yield a very accurate number since
 419          * parts of the old sessions might be inaccessible now, but we
 420          * can't do much better.  This is also important for the NFS
 421          * filehandle validation.
 422          */
 423         isomp->volume_space_size += argp->ssector;
 424         bcopy (rootp, isomp->root, sizeof isomp->root);
 425         isomp->root_extent = isonum_733 (rootp->extent);
 426         isomp->root_size = isonum_733 (rootp->size);
 427
 428         isomp->im_bmask = logical_block_size - 1;
 429         isomp->im_bshift = ffs(logical_block_size) - 1;
 430
 431         pribp->b_flags |= B_AGE;
 432         brelse(pribp);
 433         pribp = NULL;
 434
 435         mp->mnt_data = (qaddr_t)isomp;
 436         mp->mnt_stat.f_fsid.val[0] = dev2udev(dev);
 437         mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
 438         mp->mnt_maxsymlinklen = 0;
 439         mp->mnt_flag |= MNT_LOCAL;
 440         isomp->im_mountp = mp;
 441         isomp->im_dev = dev;
 442         isomp->im_devvp = devvp;
 443
 444         dev->si_mountpoint = mp;
 445
 446         /* Check the Rock Ridge Extention support */
 447         if (!(argp->flags & ISOFSMNT_NORRIP)) {
 448                 if ((error = bread(isomp->im_devvp,
 449                                   lblktooff(isomp, isomp->root_extent + isonum_711(rootp->ext_attr_length)),
 450                                   isomp->logical_block_size, &bp)) != 0)
 451                     goto out;
 452
 453                 rootp = (struct iso_directory_record *)bp->b_data;
 454
 455                 if ((isomp->rr_skip = cd9660_rrip_offset(rootp,isomp)) < 0) {
 456                     argp->flags  |= ISOFSMNT_NORRIP;
 457                 } else {
 458                     argp->flags  &= ~ISOFSMNT_GENS;
 459                 }
 460
 461                 /*
 462                  * The contents are valid,
 463                  * but they will get reread as part of another vnode, so...
 464                  */
 465                 bp->b_flags |= B_AGE;
 466                 brelse(bp);
 467                 bp = NULL;
 468         }
 469         isomp->im_flags = argp->flags & (ISOFSMNT_NORRIP | ISOFSMNT_GENS |
 470                                          ISOFSMNT_EXTATT | ISOFSMNT_NOJOLIET);
 471
 472         if (high_sierra) {
 473                 /* this effectively ignores all the mount flags */
 474                 log(LOG_INFO, "cd9660: High Sierra Format\n");
 475                 isomp->iso_ftype = ISO_FTYPE_HIGH_SIERRA;
 476         } else {
 477                 switch (isomp->im_flags&(ISOFSMNT_NORRIP|ISOFSMNT_GENS)) {
 478                   default:
 479                           isomp->iso_ftype = ISO_FTYPE_DEFAULT;
 480                           break;
 481                   case ISOFSMNT_GENS|ISOFSMNT_NORRIP:
 482                           isomp->iso_ftype = ISO_FTYPE_9660;
 483                           break;
 484                   case 0:
 485                           log(LOG_INFO, "cd9660: RockRidge Extension\n");
 486                           isomp->iso_ftype = ISO_FTYPE_RRIP;
 487                           break;
 488                 }
 489         }
 490
 491         /* Decide whether to use the Joliet descriptor */
 492
 493         if (isomp->iso_ftype != ISO_FTYPE_RRIP && joliet_level) {
 494                 log(LOG_INFO, "cd9660: Joliet Extension (Level %d)\n", joliet_level);
 495                 rootp = (struct iso_directory_record *)
 496                         sup->root_directory_record;
 497                 bcopy (rootp, isomp->root, sizeof isomp->root);
 498                 isomp->root_extent = isonum_733 (rootp->extent);
 499                 isomp->root_size = isonum_733 (rootp->size);
 500                 isomp->joliet_level = joliet_level;
 501                 supbp->b_flags |= B_AGE;
 502         }
 503
 504         if (supbp) {
 505                 brelse(supbp);
 506                 supbp = NULL;
 507         }
 508
 509         vfs_add_vnodeops(mp, &cd9660_vnode_vops, &mp->mnt_vn_norm_ops);
 510         vfs_add_vnodeops(mp, &cd9660_spec_vops, &mp->mnt_vn_spec_ops);
 511         vfs_add_vnodeops(mp, &cd9660_fifo_vops, &mp->mnt_vn_fifo_ops);
 512
 513         return 0;
 514 out:
 515         dev->si_mountpoint = NULL;
 516         if (bp)
 517                 brelse(bp);
 518         if (pribp)
 519                 brelse(pribp);
 520         if (supbp)
 521                 brelse(supbp);
 522         if (needclose)
 523                 VOP_CLOSE(devvp, FREAD);
 524         if (isomp) {
 525                 kfree((caddr_t)isomp, M_ISOFSMNT);
 526                 mp->mnt_data = (qaddr_t)0;
 527         }
 528         return error;
 529 }
 530
 531 /*
 532  * unmount system call
 533  */
 534 static int
 535 cd9660_unmount(struct mount *mp, int mntflags)
 536 {
 537         struct iso_mnt *isomp;
 538         int error, flags = 0;
 539
 540         if (mntflags & MNT_FORCE)
 541                 flags |= FORCECLOSE;
 542 #if 0
 543         mntflushbuf(mp, 0);
 544         if (mntinvalbuf(mp))
 545                 return EBUSY;
 546 #endif
 547         if ((error = vflush(mp, 0, flags)))
 548                 return (error);
 549
 550         isomp = VFSTOISOFS(mp);
 551
 552         isomp->im_devvp->v_rdev->si_mountpoint = NULL;
 553         error = VOP_CLOSE(isomp->im_devvp, FREAD);
 554         vrele(isomp->im_devvp);
 555         kfree((caddr_t)isomp, M_ISOFSMNT);
 556         mp->mnt_data = (qaddr_t)0;
 557         mp->mnt_flag &= ~MNT_LOCAL;
 558         return (error);
 559 }
 560
 561 /*
 562  * Return root of a filesystem
 563  */
 564 static int
 565 cd9660_root(struct mount *mp, struct vnode **vpp)
 566 {
 567         struct iso_mnt *imp = VFSTOISOFS(mp);
 568         struct iso_directory_record *dp =
 569             (struct iso_directory_record *)imp->root;
 570         ino_t ino = isodirino(dp, imp);
 571
 572         /*
 573          * With RRIP we must use the `.' entry of the root directory.
 574          * Simply tell vget, that it's a relocated directory.
 575          */
 576         return (cd9660_vget_internal(mp, ino, vpp,
 577             imp->iso_ftype == ISO_FTYPE_RRIP, dp));
 578 }
 579
 580 /*
 581  * Get file system statistics.
 582  */
 583 int
 584 cd9660_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
 585 {
 586         struct iso_mnt *isomp;
 587
 588         isomp = VFSTOISOFS(mp);
 589
 590         sbp->f_bsize = isomp->logical_block_size;
 591         sbp->f_iosize = sbp->f_bsize;   /* XXX */
 592         sbp->f_blocks = isomp->volume_space_size;
 593         sbp->f_bfree = 0; /* total free blocks */
 594         sbp->f_bavail = 0; /* blocks free for non superuser */
 595         sbp->f_files =  0; /* total files */
 596         sbp->f_ffree = 0; /* free file nodes */
 597         if (sbp != &mp->mnt_stat) {
 598                 sbp->f_type = mp->mnt_vfc->vfc_typenum;
 599                 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
 600         }
 601         return 0;
 602 }
 603
 604 /*
 605  * File handle to vnode
 606  *
 607  * Have to be really careful about stale file handles:
 608  * - check that the inode number is in range
 609  * - call iget() to get the locked inode
 610  * - check for an unallocated inode (i_mode == 0)
 611  * - check that the generation number matches
 612  */
 613
 614 struct ifid {
 615         ushort  ifid_len;
 616         ushort  ifid_pad;
 617         int     ifid_ino;
 618         long    ifid_start;
 619 };
 620
 621 /* ARGSUSED */
 622 int
 623 cd9660_fhtovp(struct mount *mp, struct vnode *rootvp,
 624               struct fid *fhp, struct vnode **vpp)
 625 {
 626         struct ifid *ifhp = (struct ifid *)fhp;
 627         struct iso_node *ip;
 628         struct vnode *nvp;
 629         int error;
 630
 631 #ifdef  ISOFS_DBG
 632         kprintf("fhtovp: ino %d, start %ld\n",
 633                ifhp->ifid_ino, ifhp->ifid_start);
 634 #endif
 635
 636         if ((error = VFS_VGET(mp, NULL, ifhp->ifid_ino, &nvp)) != 0) {
 637                 *vpp = NULLVP;
 638                 return (error);
 639         }
 640         ip = VTOI(nvp);
 641         if (ip->inode.iso_mode == 0) {
 642                 vput(nvp);
 643                 *vpp = NULLVP;
 644                 return (ESTALE);
 645         }
 646         *vpp = nvp;
 647         return (0);
 648 }
 649
 650 int
 651 cd9660_checkexp(struct mount *mp, struct sockaddr *nam, int *exflagsp,
 652                 struct ucred **credanonp)
 653 {
 654         struct netcred *np;
 655         struct iso_mnt *imp;
 656
 657         imp = VFSTOISOFS(mp);
 658
 659         /*
 660          * Get the export permission structure for this <mp, client> tuple.
 661          */
 662         np = vfs_export_lookup(mp, &imp->im_export, nam);
 663         if (np == NULL)
 664                 return (EACCES);
 665
 666         *exflagsp = np->netc_exflags;
 667         *credanonp = &np->netc_anon;
 668         return (0);
 669 }
 670
 671 int
 672 cd9660_vget(struct mount *mp, struct vnode *dvp, ino_t ino, struct vnode **vpp)
 673 {
 674
 675         /*
 676          * XXXX
 677          * It would be nice if we didn't always set the `relocated' flag
 678          * and force the extra read, but I don't want to think about fixing
 679          * that right now.
 680          */
 681         return (cd9660_vget_internal(mp, ino, vpp,
 682 #if 0
 683             VFSTOISOFS(mp)->iso_ftype == ISO_FTYPE_RRIP,
 684 #else
 685             0,
 686 #endif
 687             NULL));
 688 }
 689
 690 int
 691 cd9660_vget_internal(struct mount *mp, ino_t ino, struct vnode **vpp,
 692                      int relocated, struct iso_directory_record *isodir)
 693 {
 694         struct iso_mnt *imp;
 695         struct iso_node *ip;
 696         struct buf *bp;
 697         struct vnode *vp;
 698         cdev_t dev;
 699         int error;
 700
 701         imp = VFSTOISOFS(mp);
 702         dev = imp->im_dev;
 703 again:
 704         if ((*vpp = cd9660_ihashget(dev, ino)) != NULLVP)
 705                 return (0);
 706
 707         /* Allocate a new vnode/iso_node. */
 708         error = getnewvnode(VT_ISOFS, mp, &vp, 0, 0);
 709         if (error) {
 710                 *vpp = NULLVP;
 711                 return (error);
 712         }
 713         MALLOC(ip, struct iso_node *, sizeof(struct iso_node), M_ISOFSNODE,
 714             M_WAITOK | M_ZERO);
 715         ip->i_vnode = vp;
 716         ip->i_dev = dev;
 717         ip->i_number = ino;
 718
 719         /*
 720          * Insert it into the inode hash table and check for a collision.
 721          * If a collision occurs, throw away the vnode and try again.
 722          */
 723         if (cd9660_ihashins(ip) != 0) {
 724                 kprintf("debug: cd9660 ihashins collision, retrying\n");
 725                 vx_put(vp);
 726                 kfree(ip, M_ISOFSNODE);
 727                 goto again;
 728         }
 729         vp->v_data = ip;
 730
 731         if (isodir == NULL) {
 732                 int lbn, off;
 733
 734                 lbn = lblkno(imp, ino);
 735                 if (lbn >= imp->volume_space_size) {
 736                         vx_put(vp);
 737                         kprintf("fhtovp: lbn exceed volume space %d\n", lbn);
 738                         return (ESTALE);
 739                 }
 740
 741                 off = blkoff(imp, ino);
 742                 if (off + ISO_DIRECTORY_RECORD_SIZE > imp->logical_block_size) {
 743                         vx_put(vp);
 744                         kprintf("fhtovp: crosses block boundary %d\n",
 745                                off + ISO_DIRECTORY_RECORD_SIZE);
 746                         return (ESTALE);
 747                 }
 748
 749                 error = bread(imp->im_devvp,
 750                               lblktooff(imp, lbn),
 751                               imp->logical_block_size, &bp);
 752                 if (error) {
 753                         vx_put(vp);
 754                         brelse(bp);
 755                         kprintf("fhtovp: bread error %d\n",error);
 756                         return (error);
 757                 }
 758                 isodir = (struct iso_directory_record *)(bp->b_data + off);
 759
 760                 if (off + isonum_711(isodir->length) >
 761                     imp->logical_block_size) {
 762                         vx_put(vp);
 763                         if (bp != NULL)
 764                                 brelse(bp);
 765                         kprintf("fhtovp: directory crosses block boundary %d[off=%d/len=%d]\n",
 766                                off +isonum_711(isodir->length), off,
 767                                isonum_711(isodir->length));
 768                         return (ESTALE);
 769                 }
 770
 771 #if 0
 772                 if (isonum_733(isodir->extent) +
 773                     isonum_711(isodir->ext_attr_length) != ifhp->ifid_start) {
 774                         if (bp != NULL)
 775                                 brelse(bp);
 776                         kprintf("fhtovp: file start miss %d vs %d\n",
 777                                isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length),
 778                                ifhp->ifid_start);
 779                         return (ESTALE);
 780                 }
 781 #endif
 782         } else
 783                 bp = 0;
 784
 785         ip->i_mnt = imp;
 786         ip->i_devvp = imp->im_devvp;
 787         vref(ip->i_devvp);
 788
 789         if (relocated) {
 790                 /*
 791                  * On relocated directories we must
 792                  * read the `.' entry out of a dir.
 793                  */
 794                 ip->iso_start = ino >> imp->im_bshift;
 795                 if (bp != NULL)
 796                         brelse(bp);
 797                 if ((error = cd9660_devblkatoff(vp, (off_t)0, NULL, &bp)) != 0) {
 798                         vx_put(vp);
 799                         return (error);
 800                 }
 801                 isodir = (struct iso_directory_record *)bp->b_data;
 802         }
 803
 804         ip->iso_extent = isonum_733(isodir->extent);
 805         ip->i_size = isonum_733(isodir->size);
 806         ip->iso_start = isonum_711(isodir->ext_attr_length) + ip->iso_extent;
 807
 808         /*
 809          * Setup time stamp, attribute
 810          */
 811         vp->v_type = VNON;
 812         switch (imp->iso_ftype) {
 813         default:        /* ISO_FTYPE_9660 */
 814             {
 815                 struct buf *bp2;
 816                 int off;
 817                 if ((imp->im_flags & ISOFSMNT_EXTATT)
 818                     && (off = isonum_711(isodir->ext_attr_length)))
 819                         cd9660_devblkatoff(vp, (off_t)-(off << imp->im_bshift), NULL,
 820                                      &bp2);
 821                 else
 822                         bp2 = NULL;
 823                 cd9660_defattr(isodir, ip, bp2, ISO_FTYPE_9660);
 824                 cd9660_deftstamp(isodir, ip, bp2, ISO_FTYPE_9660);
 825                 if (bp2)
 826                         brelse(bp2);
 827                 break;
 828             }
 829         case ISO_FTYPE_RRIP:
 830                 cd9660_rrip_analyze(isodir, ip, imp);
 831                 break;
 832         }
 833
 834         if (bp != NULL)
 835                 brelse(bp);
 836
 837         /*
 838          * Initialize the associated vnode
 839          */
 840         vp->v_type = IFTOVT(ip->inode.iso_mode);
 841
 842         switch (vp->v_type) {
 843         case VFIFO:
 844                 vp->v_ops = &mp->mnt_vn_fifo_ops;
 845                 break;
 846         case VCHR:
 847         case VBLK:
 848                 vp->v_ops = &mp->mnt_vn_spec_ops;
 849                 addaliasu(vp, umajor(ip->inode.iso_rdev),
 850                           uminor(ip->inode.iso_rdev));
 851                 break;
 852         case VREG:
 853         case VDIR:
 854                 vinitvmio(vp, ip->i_size);
 855                 break;
 856         default:
 857                 break;
 858         }
 859
 860         if (ip->iso_extent == imp->root_extent)
 861                 vp->v_flag |= VROOT;
 862
 863         /*
 864          * Return the locked and refd vp
 865          */
 866         *vpp = vp;
 867         return (0);
 868 }
 869
 870 /*
 871  * Vnode pointer to File handle
 872  */
 873 /* ARGSUSED */
 874 int
 875 cd9660_vptofh(struct vnode *vp, struct fid *fhp)
 876 {
 877         struct iso_node *ip = VTOI(vp);
 878         struct ifid *ifhp;
 879
 880         ifhp = (struct ifid *)fhp;
 881         ifhp->ifid_len = sizeof(struct ifid);
 882
 883         ifhp->ifid_ino = ip->i_number;
 884         ifhp->ifid_start = ip->iso_start;
 885
 886 #ifdef  ISOFS_DBG
 887         kprintf("vptofh: ino %d, start %ld\n",
 888                ifhp->ifid_ino,ifhp->ifid_start);
 889 #endif
 890         return 0;
 891 }