sys/vfs/udf/udf_vfsops.c

   1 /*-
   2  * Copyright (c) 2001, 2002 Scott Long <scottl@freebsd.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $FreeBSD: src/sys/fs/udf/udf_vfsops.c,v 1.16 2003/11/05 06:56:08 scottl Exp $
  27  * $DragonFly: src/sys/vfs/udf/udf_vfsops.c,v 1.28 2008/09/17 21:44:25 dillon Exp $
  28  */
  29
  30 /* udf_vfsops.c */
  31 /* Implement the VFS side of things */
  32
  33 /*
  34  * Ok, here's how it goes.  The UDF specs are pretty clear on how each data
  35  * structure is made up, but not very clear on how they relate to each other.
  36  * Here is the skinny... This demostrates a filesystem with one file in the
  37  * root directory.  Subdirectories are treated just as normal files, but they
  38  * have File Id Descriptors of their children as their file data.  As for the
  39  * Anchor Volume Descriptor Pointer, it can exist in two of the following three
  40  * places: sector 256, sector n (the max sector of the disk), or sector
  41  * n - 256.  It's a pretty good bet that one will exist at sector 256 though.
  42  * One caveat is unclosed CD media.  For that, sector 256 cannot be written,
  43  * so the Anchor Volume Descriptor Pointer can exist at sector 512 until the
  44  * media is closed.
  45  *
  46  *  Sector:
  47  *     256:
  48  *       n: Anchor Volume Descriptor Pointer
  49  * n - 256:     |
  50  *              |
  51  *              |-->Main Volume Descriptor Sequence
  52  *                      |       |
  53  *                      |       |
  54  *                      |       |-->Logical Volume Descriptor
  55  *                      |                         |
  56  *                      |-->Partition Descriptor  |
  57  *                              |                 |
  58  *                              |                 |
  59  *                              |-->Fileset Descriptor
  60  *                                      |
  61  *                                      |
  62  *                                      |-->Root Dir File Entry
  63  *                                              |
  64  *                                              |
  65  *                                              |-->File data:
  66  *                                                  File Id Descriptor
  67  *                                                      |
  68  *                                                      |
  69  *                                                      |-->File Entry
  70  *                                                              |
  71  *                                                              |
  72  *                                                              |-->File data
  73  */
  74
  75 #include <sys/types.h>
  76 #include <sys/param.h>
  77 #include <sys/systm.h>
  78 #include <sys/uio.h>
  79 #include <sys/buf.h>
  80 #include <sys/conf.h>
  81 #include <sys/fcntl.h>
  82 #include <sys/module.h>
  83 #include <sys/kernel.h>
  84 #include <sys/malloc.h>
  85 #include <sys/mount.h>
  86 #include <sys/nlookup.h>
  87 #include <sys/proc.h>
  88 #include <sys/priv.h>
  89 #include <sys/queue.h>
  90 #include <sys/vnode.h>
  91
  92 #include <vfs/udf/ecma167-udf.h>
  93 #include <vfs/udf/osta.h>
  94 #include <vfs/udf/udf.h>
  95 #include <vfs/udf/udf_mount.h>
  96
  97 extern struct vop_ops udf_vnode_vops;
  98
  99 MALLOC_DEFINE(M_UDFNODE, "UDF node", "UDF node structure");
 100 MALLOC_DEFINE(M_UDFMOUNT, "UDF mount", "UDF mount structure");
 101 MALLOC_DEFINE(M_UDFFENTRY, "UDF fentry", "UDF file entry structure");
 102
 103 static int udf_mount(struct mount *, char *, caddr_t, struct ucred *);
 104 static int udf_unmount(struct mount *, int);
 105 static int udf_root(struct mount *, struct vnode **);
 106 static int udf_statfs(struct mount *, struct statfs *, struct ucred *);
 107 static int udf_fhtovp(struct mount *, struct vnode *,
 108                                 struct fid *, struct vnode **);
 109 static int udf_vptofh(struct vnode *, struct fid *);
 110
 111 static int udf_find_partmaps(struct udf_mnt *, struct logvol_desc *);
 112
 113 static struct vfsops udf_vfsops = {
 114         .vfs_mount =            udf_mount,
 115         .vfs_unmount =          udf_unmount,
 116         .vfs_root =             udf_root,
 117         .vfs_statfs =           udf_statfs,
 118         .vfs_sync =             vfs_stdsync,
 119         .vfs_vget =             udf_vget,
 120         .vfs_fhtovp =           udf_fhtovp,
 121         .vfs_vptofh =           udf_vptofh
 122 };
 123 VFS_SET(udf_vfsops, udf, VFCF_READONLY);
 124
 125 MODULE_VERSION(udf, 1);
 126
 127 static int udf_mountfs(struct vnode *, struct mount *);
 128
 129 static int
 130 udf_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred)
 131 {
 132         struct vnode *devvp;    /* vnode of the mount device */
 133         struct udf_args args;
 134         struct udf_mnt *imp = 0;
 135         size_t size;
 136         int error;
 137         struct nlookupdata nd;
 138
 139         if ((mp->mnt_flag & MNT_RDONLY) == 0)
 140                 return (EROFS);
 141
 142         /*
 143          * No root filesystem support.  Probably not a big deal, since the
 144          * bootloader doesn't understand UDF.
 145          */
 146         if (mp->mnt_flag & MNT_ROOTFS)
 147                 return (ENOTSUP);
 148
 149         if ((error = copyin(data, (caddr_t)&args, sizeof(struct udf_args))))
 150                 return(error);
 151
 152         if (mp->mnt_flag & MNT_UPDATE) {
 153                 imp = VFSTOUDFFS(mp);
 154                 if (args.fspec == NULL)
 155                         return(vfs_export(mp, &imp->im_export, &args.export));
 156         }
 157
 158         /* Check that the mount device exists */
 159         devvp = NULL;
 160         error = nlookup_init(&nd, args.fspec, UIO_USERSPACE, NLC_FOLLOW);
 161         if (error == 0)
 162                 error = nlookup(&nd);
 163         if (error == 0)
 164                 error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp);
 165         nlookup_done(&nd);
 166         if (error)
 167                 return (error);
 168
 169         if (vn_isdisk(devvp, &error) == 0) {
 170                 vrele(devvp);
 171                 return(error);
 172         }
 173
 174         /* Check the access rights on the mount device */
 175         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
 176         error = VOP_EACCESS(devvp, VREAD, cred);
 177         if (error)
 178                 error = priv_check_cred(cred, PRIV_ROOT, 0);
 179         if (error) {
 180                 vput(devvp);
 181                 return(error);
 182         }
 183         vn_unlock(devvp);
 184
 185         if ((error = udf_mountfs(devvp, mp))) {
 186                 vrele(devvp);
 187                 return(error);
 188         }
 189
 190         imp = VFSTOUDFFS(mp);
 191
 192         imp->im_flags = args.flags;
 193
 194         copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size);
 195         bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
 196         udf_statfs(mp, &mp->mnt_stat, cred);
 197         return(0);
 198 }
 199
 200 /*
 201  * Check the descriptor tag for both the correct id and correct checksum.
 202  * Return zero if all is good, EINVAL if not.
 203  */
 204 int
 205 udf_checktag(struct desc_tag *tag, uint16_t id)
 206 {
 207         uint8_t *itag;
 208         uint8_t i, cksum = 0;
 209
 210         itag = (uint8_t *)tag;
 211
 212         if (tag->id != id)
 213                 return(EINVAL);
 214
 215         for (i = 0; i < 15; i++)
 216                 cksum = cksum + itag[i];
 217         cksum = cksum - itag[4];
 218
 219         if (cksum == tag->cksum)
 220                 return(0);
 221
 222         return(EINVAL);
 223 }
 224
 225 static int
 226 udf_mountfs(struct vnode *devvp, struct mount *mp)
 227 {
 228         struct buf *bp = NULL;
 229         struct anchor_vdp avdp;
 230         struct udf_mnt *udfmp = NULL;
 231         struct part_desc *pd;
 232         struct logvol_desc *lvd;
 233         struct fileset_desc *fsd;
 234         struct file_entry *root_fentry;
 235         cdev_t dev;
 236         uint32_t sector, size, mvds_start, mvds_end;
 237         uint32_t fsd_offset = 0;
 238         uint16_t part_num = 0, fsd_part = 0;
 239         int error = EINVAL, needclose = 0;
 240         int logvol_found = 0, part_found = 0, fsd_found = 0;
 241         int bsize;
 242
 243         /*
 244          * Disallow multiple mounts of the same device. Flush the buffer
 245          * cache for the device.
 246          */
 247         if ((error = vfs_mountedon(devvp)))
 248                 return(error);
 249         if (vcount(devvp) > 0)
 250                 return(EBUSY);
 251         if ((error = vinvalbuf(devvp, V_SAVE, 0, 0)))
 252                 return(error);
 253
 254         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
 255         error = VOP_OPEN(devvp, FREAD, FSCRED, NULL);
 256         vn_unlock(devvp);
 257         if (error)
 258                 return(error);
 259         needclose = 1;
 260         dev = devvp->v_rdev;
 261
 262         udfmp = kmalloc(sizeof(*udfmp), M_UDFMOUNT, M_WAITOK | M_ZERO);
 263
 264         mp->mnt_data = (qaddr_t)udfmp;
 265         mp->mnt_stat.f_fsid.val[0] = dev2udev(dev);
 266         mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
 267         mp->mnt_maxsymlinklen = 0;
 268         mp->mnt_flag |= MNT_LOCAL;
 269         udfmp->im_mountp = mp;
 270         udfmp->im_dev = dev;
 271         udfmp->im_devvp = devvp;
 272
 273         bsize = 2048;   /* XXX Should probe the media for it's size */
 274
 275         /*
 276          * Get the Anchor Volume Descriptor Pointer from sector 256.
 277          * XXX Should also check sector n - 256, n, and 512.
 278          */
 279         sector = 256;
 280         if ((error = bread(devvp, (off_t)sector * bsize, bsize, &bp)) != 0)
 281                 goto bail;
 282         if ((error = udf_checktag((struct desc_tag *)bp->b_data, TAGID_ANCHOR)))
 283                 goto bail;
 284
 285         bcopy(bp->b_data, &avdp, sizeof(struct anchor_vdp));
 286         brelse(bp);
 287         bp = NULL;
 288
 289         /*
 290          * Extract the Partition Descriptor and Logical Volume Descriptor
 291          * from the Volume Descriptor Sequence.
 292          * XXX Should we care about the partition type right now?
 293          * XXX What about multiple partitions?
 294          */
 295         mvds_start = avdp.main_vds_ex.loc;
 296         mvds_end = mvds_start + (avdp.main_vds_ex.len - 1) / bsize;
 297         for (sector = mvds_start; sector < mvds_end; sector++) {
 298                 if ((error = bread(devvp, (off_t)sector * bsize, bsize,
 299                                    &bp)) != 0) {
 300                         kprintf("Can't read sector %d of VDS\n", sector);
 301                         goto bail;
 302                 }
 303                 lvd = (struct logvol_desc *)bp->b_data;
 304                 if (!udf_checktag(&lvd->tag, TAGID_LOGVOL)) {
 305                         udfmp->bsize = lvd->lb_size;
 306                         udfmp->bmask = udfmp->bsize - 1;
 307                         udfmp->bshift = ffs(udfmp->bsize) - 1;
 308                         fsd_part = lvd->_lvd_use.fsd_loc.loc.part_num;
 309                         fsd_offset = lvd->_lvd_use.fsd_loc.loc.lb_num;
 310                         if (udf_find_partmaps(udfmp, lvd))
 311                                 break;
 312                         logvol_found = 1;
 313                 }
 314                 pd = (struct part_desc *)bp->b_data;
 315                 if (!udf_checktag(&pd->tag, TAGID_PARTITION)) {
 316                         part_found = 1;
 317                         part_num = pd->part_num;
 318                         udfmp->part_len = pd->part_len;
 319                         udfmp->part_start = pd->start_loc;
 320                 }
 321
 322                 brelse(bp);
 323                 bp = NULL;
 324                 if ((part_found) && (logvol_found))
 325                         break;
 326         }
 327
 328         if (!part_found || !logvol_found) {
 329                 error = EINVAL;
 330                 goto bail;
 331         }
 332
 333         if (fsd_part != part_num) {
 334                 kprintf("FSD does not lie within the partition!\n");
 335                 error = EINVAL;
 336                 goto bail;
 337         }
 338
 339
 340         /*
 341          * Grab the Fileset Descriptor
 342          * Thanks to Chuck McCrobie <mccrobie@cablespeed.com> for pointing
 343          * me in the right direction here.
 344          */
 345         sector = udfmp->part_start + fsd_offset;
 346         if ((error = RDSECTOR(devvp, sector, udfmp->bsize, &bp)) != 0) {
 347                 kprintf("Cannot read sector %d of FSD\n", sector);
 348                 goto bail;
 349         }
 350         fsd = (struct fileset_desc *)bp->b_data;
 351         if (!udf_checktag(&fsd->tag, TAGID_FSD)) {
 352                 fsd_found = 1;
 353                 bcopy(&fsd->rootdir_icb, &udfmp->root_icb,
 354                       sizeof(struct long_ad));
 355         }
 356
 357         brelse(bp);
 358         bp = NULL;
 359
 360         if (!fsd_found) {
 361                 kprintf("Couldn't find the fsd\n");
 362                 error = EINVAL;
 363                 goto bail;
 364         }
 365
 366         vfs_add_vnodeops(mp, &udf_vnode_vops, &mp->mnt_vn_norm_ops);
 367
 368         /*
 369          * Find the file entry for the root directory.
 370          */
 371         sector = udfmp->root_icb.loc.lb_num + udfmp->part_start;
 372         size = udfmp->root_icb.len;
 373         if ((error = udf_readlblks(udfmp, sector, size, &bp)) != 0) {
 374                 kprintf("Cannot read sector %d\n", sector);
 375                 goto bail;
 376         }
 377
 378         root_fentry = (struct file_entry *)bp->b_data;
 379         if ((error = udf_checktag(&root_fentry->tag, TAGID_FENTRY))) {
 380                 kprintf("Invalid root file entry!\n");
 381                 goto bail;
 382         }
 383
 384         brelse(bp);
 385         bp = NULL;
 386
 387         lwkt_token_init(&udfmp->hash_token);
 388         udfmp->hashtbl = phashinit(UDF_HASHTBLSIZE, M_UDFMOUNT, &udfmp->hashsz);
 389
 390         return(0);
 391
 392 bail:
 393         if (udfmp != NULL)
 394                 kfree(udfmp, M_UDFMOUNT);
 395         if (bp != NULL)
 396                 brelse(bp);
 397         if (needclose)
 398                 VOP_CLOSE(devvp, FREAD);
 399         return(error);
 400 }
 401
 402 static int
 403 udf_unmount(struct mount *mp, int mntflags)
 404 {
 405         struct udf_mnt *udfmp;
 406         int error, flags = 0;
 407
 408         udfmp = VFSTOUDFFS(mp);
 409
 410         if (mntflags & MNT_FORCE)
 411                 flags |= FORCECLOSE;
 412
 413         if ((error = vflush(mp, 0, flags)))
 414                 return (error);
 415
 416         udfmp->im_devvp->v_rdev->si_mountpoint = NULL;
 417         error = VOP_CLOSE(udfmp->im_devvp, FREAD);
 418         vrele(udfmp->im_devvp);
 419
 420         if (udfmp->s_table)
 421                 kfree(udfmp->s_table, M_UDFMOUNT);
 422         if (udfmp->hashtbl)
 423                 kfree(udfmp->hashtbl, M_UDFMOUNT);
 424         kfree(udfmp, M_UDFMOUNT);
 425
 426         mp->mnt_data = (qaddr_t)0;
 427         mp->mnt_flag &= ~MNT_LOCAL;
 428
 429         return (error);
 430 }
 431
 432 static int
 433 udf_root(struct mount *mp, struct vnode **vpp)
 434 {
 435         struct udf_mnt *udfmp;
 436         struct vnode *vp;
 437         ino_t id;
 438         int error;
 439
 440         udfmp = VFSTOUDFFS(mp);
 441
 442         id = udf_getid(&udfmp->root_icb);
 443
 444         error = udf_vget(mp, NULL, id, vpp);
 445         if (error)
 446                 return(error);
 447
 448         vp = *vpp;
 449         vp->v_flag |= VROOT;
 450         udfmp->root_vp = vp;
 451
 452         return(0);
 453 }
 454
 455 static int
 456 udf_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
 457 {
 458         struct udf_mnt *udfmp;
 459
 460         udfmp = VFSTOUDFFS(mp);
 461
 462         sbp->f_bsize = udfmp->bsize;
 463         sbp->f_iosize = udfmp->bsize;
 464         sbp->f_blocks = udfmp->part_len;
 465         sbp->f_bfree = 0;
 466         sbp->f_bavail = 0;
 467         sbp->f_files = 0;
 468         sbp->f_ffree = 0;
 469         if (sbp != &mp->mnt_stat) {
 470                 sbp->f_type = mp->mnt_vfc->vfc_typenum;
 471                 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
 472         }
 473
 474         return(0);
 475 }
 476
 477 int
 478 udf_vget(struct mount *mp, struct vnode *dvp, ino_t ino, struct vnode **vpp)
 479 {
 480         struct buf *bp;
 481         struct vnode *devvp;
 482         struct udf_mnt *udfmp;
 483         struct thread *td;
 484         struct vnode *vp;
 485         struct udf_node *unode;
 486         struct file_entry *fe;
 487         int error, sector, size;
 488
 489         td = curthread;
 490         udfmp = VFSTOUDFFS(mp);
 491
 492         /* See if we already have this in the cache */
 493         if ((error = udf_hashlookup(udfmp, ino, vpp)) != 0)
 494                 return(error);
 495         if (*vpp != NULL) {
 496                 return(0);
 497         }
 498
 499         /*
 500          * Allocate memory and check the tag id's before grabbing a new
 501          * vnode, since it's hard to roll back if there is a problem.
 502          */
 503         unode = kmalloc(sizeof(*unode), M_UDFNODE, M_WAITOK | M_ZERO);
 504
 505         /*
 506          * Copy in the file entry.  Per the spec, the size can only be 1 block.
 507          */
 508         sector = ino + udfmp->part_start;
 509         devvp = udfmp->im_devvp;
 510         if ((error = RDSECTOR(devvp, sector, udfmp->bsize, &bp)) != 0) {
 511                 kprintf("Cannot read sector %d\n", sector);
 512                 kfree(unode, M_UDFNODE);
 513                 return(error);
 514         }
 515
 516         fe = (struct file_entry *)bp->b_data;
 517         if (udf_checktag(&fe->tag, TAGID_FENTRY)) {
 518                 kprintf("Invalid file entry!\n");
 519                 kfree(unode, M_UDFNODE);
 520                 brelse(bp);
 521                 return(ENOMEM);
 522         }
 523         size = UDF_FENTRY_SIZE + fe->l_ea + fe->l_ad;
 524         unode->fentry = kmalloc(size, M_UDFFENTRY, M_WAITOK | M_ZERO);
 525
 526         bcopy(bp->b_data, unode->fentry, size);
 527
 528         brelse(bp);
 529         bp = NULL;
 530
 531         if ((error = udf_allocv(mp, &vp))) {
 532                 kprintf("Error from udf_allocv\n");
 533                 kfree(unode, M_UDFNODE);
 534                 return(error);
 535         }
 536
 537         unode->i_vnode = vp;
 538         unode->hash_id = ino;
 539         unode->i_devvp = udfmp->im_devvp;
 540         unode->i_dev = udfmp->im_dev;
 541         unode->udfmp = udfmp;
 542         vp->v_data = unode;
 543         vref(udfmp->im_devvp);
 544         udf_hashins(unode);
 545
 546         switch (unode->fentry->icbtag.file_type) {
 547         default:
 548                 vp->v_type = VBAD;
 549                 break;
 550         case 4:
 551                 vp->v_type = VDIR;
 552                 break;
 553         case 5:
 554                 vp->v_type = VREG;
 555                 break;
 556         case 6:
 557                 vp->v_type = VBLK;
 558                 break;
 559         case 7:
 560                 vp->v_type = VCHR;
 561                 break;
 562         case 9:
 563                 vp->v_type = VFIFO;
 564                 break;
 565         case 10:
 566                 vp->v_type = VSOCK;
 567                 break;
 568         case 12:
 569                 vp->v_type = VLNK;
 570                 break;
 571         }
 572         /*
 573          * Locked and refd vnode returned
 574          */
 575         *vpp = vp;
 576
 577         return(0);
 578 }
 579
 580 struct ifid {
 581         u_short ifid_len;
 582         u_short ifid_pad;
 583         int     ifid_ino;
 584         long    ifid_start;
 585 };
 586
 587 static int
 588 udf_fhtovp(struct mount *mp, struct vnode *rootvp,
 589            struct fid *fhp, struct vnode **vpp)
 590 {
 591         struct ifid *ifhp;
 592         struct vnode *nvp;
 593         int error;
 594
 595         ifhp = (struct ifid *)fhp;
 596
 597         if ((error = VFS_VGET(mp, NULL, ifhp->ifid_ino, &nvp)) != 0) {
 598                 *vpp = NULLVP;
 599                 return(error);
 600         }
 601
 602         *vpp = nvp;
 603         return(0);
 604 }
 605
 606 static int
 607 udf_vptofh (struct vnode *vp, struct fid *fhp)
 608 {
 609         struct udf_node *node;
 610         struct ifid *ifhp;
 611
 612         node = VTON(vp);
 613         ifhp = (struct ifid *)fhp;
 614         ifhp->ifid_len = sizeof(struct ifid);
 615         ifhp->ifid_ino = node->hash_id;
 616
 617         return(0);
 618 }
 619
 620 static int
 621 udf_find_partmaps(struct udf_mnt *udfmp, struct logvol_desc *lvd)
 622 {
 623         union udf_pmap *pmap;
 624         struct part_map_spare *pms;
 625         struct regid *pmap_id;
 626         struct buf *bp;
 627         unsigned char regid_id[UDF_REGID_ID_SIZE + 1];
 628         int ptype, psize, error;
 629         unsigned int i;
 630
 631         for (i = 0; i < lvd->n_pm; i++) {
 632                 pmap = (union udf_pmap *)&lvd->maps[i * UDF_PMAP_SIZE];
 633                 ptype = pmap->data[0];
 634                 psize = pmap->data[1];
 635                 if (((ptype != 1) && (ptype != 2)) ||
 636                     ((psize != UDF_PMAP_SIZE) && (psize != 6))) {
 637                         kprintf("Invalid partition map found\n");
 638                         return(1);
 639                 }
 640
 641                 if (ptype == 1) {
 642                         /* Type 1 map.  We don't care */
 643                         continue;
 644                 }
 645
 646                 /* Type 2 map.  Gotta find out the details */
 647                 pmap_id = (struct regid *)&pmap->data[4];
 648                 bzero(&regid_id[0], UDF_REGID_ID_SIZE);
 649                 bcopy(&pmap_id->id[0], &regid_id[0], UDF_REGID_ID_SIZE);
 650
 651                 if (bcmp(&regid_id[0], "*UDF Sparable Partition",
 652                     UDF_REGID_ID_SIZE)) {
 653                         kprintf("Unsupported partition map: %s\n", &regid_id[0]);
 654                         return(1);
 655                 }
 656
 657                 pms = &pmap->pms;
 658                 udfmp->s_table = kmalloc(pms->st_size, M_UDFMOUNT,
 659                                         M_WAITOK | M_ZERO);
 660
 661                 /* Calculate the number of sectors per packet. */
 662                 /* XXX Logical or physical? */
 663                 udfmp->p_sectors = pms->packet_len / udfmp->bsize;
 664
 665                 /*
 666                  * XXX If reading the first Sparing Table fails, should look
 667                  * for another table.
 668                  */
 669                 if ((error = udf_readlblks(udfmp, pms->st_loc[0], pms->st_size,
 670                     &bp)) != 0) {
 671                         if (bp)
 672                                 brelse(bp);
 673                         kprintf("Failed to read Sparing Table at sector %d\n",
 674                             pms->st_loc[0]);
 675                         return(error);
 676                 }
 677                 bcopy(bp->b_data, udfmp->s_table, pms->st_size);
 678                 brelse(bp);
 679
 680                 if (udf_checktag(&udfmp->s_table->tag, 0)) {
 681                         kprintf("Invalid sparing table found\n");
 682                         return(EINVAL);
 683                 }
 684
 685                 /* See how many valid entries there are here.  The list is
 686                  * supposed to be sorted. 0xfffffff0 and higher are not valid
 687                  */
 688                 for (i = 0; i < udfmp->s_table->rt_l; i++) {
 689                         udfmp->s_table_entries = i;
 690                         if (udfmp->s_table->entries[i].org >= 0xfffffff0)
 691                                 break;
 692                 }
 693         }
 694
 695         return(0);
 696 }