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 1.27 2008/01/06 16:55:53 swildner 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/queue.h>
  89 #include <sys/vnode.h>
  90
  91 #include <vfs/udf/ecma167-udf.h>
  92 #include <vfs/udf/osta.h>
  93 #include <vfs/udf/udf.h>
  94 #include <vfs/udf/udf_mount.h>
  95
  96 extern struct vop_ops udf_vnode_vops;
  97
  98 MALLOC_DEFINE(M_UDFNODE, "UDF node", "UDF node structure");
  99 MALLOC_DEFINE(M_UDFMOUNT, "UDF mount", "UDF mount structure");
 100 MALLOC_DEFINE(M_UDFFENTRY, "UDF fentry", "UDF file entry structure");
 101
 102 static int udf_mount(struct mount *, char *, caddr_t, struct ucred *);
 103 static int udf_unmount(struct mount *, int);
 104 static int udf_root(struct mount *, struct vnode **);
 105 static int udf_statfs(struct mount *, struct statfs *, struct ucred *);
 106 static int udf_fhtovp(struct mount *, struct fid *, struct vnode **);
 107 static int udf_vptofh(struct vnode *, struct fid *);
 108
 109 static int udf_find_partmaps(struct udf_mnt *, struct logvol_desc *);
 110
 111 static struct vfsops udf_vfsops = {
 112         .vfs_mount =            udf_mount,
 113         .vfs_unmount =          udf_unmount,
 114         .vfs_root =             udf_root,
 115         .vfs_statfs =           udf_statfs,
 116         .vfs_sync =             vfs_stdsync,
 117         .vfs_vget =             udf_vget,
 118         .vfs_fhtovp =           udf_fhtovp,
 119         .vfs_vptofh =           udf_vptofh
 120 };
 121 VFS_SET(udf_vfsops, udf, VFCF_READONLY);
 122
 123 MODULE_VERSION(udf, 1);
 124
 125 static int udf_mountfs(struct vnode *, struct mount *);
 126
 127 static int
 128 udf_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred)
 129 {
 130         struct vnode *devvp;    /* vnode of the mount device */
 131         struct udf_args args;
 132         struct udf_mnt *imp = 0;
 133         size_t size;
 134         int error;
 135         struct nlookupdata nd;
 136
 137         if ((mp->mnt_flag & MNT_RDONLY) == 0)
 138                 return (EROFS);
 139
 140         /*
 141          * No root filesystem support.  Probably not a big deal, since the
 142          * bootloader doesn't understand UDF.
 143          */
 144         if (mp->mnt_flag & MNT_ROOTFS)
 145                 return (ENOTSUP);
 146
 147         if ((error = copyin(data, (caddr_t)&args, sizeof(struct udf_args))))
 148                 return(error);
 149
 150         if (mp->mnt_flag & MNT_UPDATE) {
 151                 imp = VFSTOUDFFS(mp);
 152                 if (args.fspec == NULL)
 153                         return(vfs_export(mp, &imp->im_export, &args.export));
 154         }
 155
 156         /* Check that the mount device exists */
 157         devvp = NULL;
 158         error = nlookup_init(&nd, args.fspec, UIO_USERSPACE, NLC_FOLLOW);
 159         if (error == 0)
 160                 error = nlookup(&nd);
 161         if (error == 0)
 162                 error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp);
 163         nlookup_done(&nd);
 164         if (error)
 165                 return (error);
 166
 167         if (vn_isdisk(devvp, &error) == 0) {
 168                 vrele(devvp);
 169                 return(error);
 170         }
 171
 172         /* Check the access rights on the mount device */
 173         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
 174         error = VOP_ACCESS(devvp, VREAD, cred);
 175         if (error)
 176                 error = suser_cred(cred, 0);
 177         if (error) {
 178                 vput(devvp);
 179                 return(error);
 180         }
 181         vn_unlock(devvp);
 182
 183         if ((error = udf_mountfs(devvp, mp))) {
 184                 vrele(devvp);
 185                 return(error);
 186         }
 187
 188         imp = VFSTOUDFFS(mp);
 189
 190         imp->im_flags = args.flags;
 191
 192         copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size);
 193         bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
 194         udf_statfs(mp, &mp->mnt_stat, cred);
 195         return(0);
 196 }
 197
 198 /*
 199  * Check the descriptor tag for both the correct id and correct checksum.
 200  * Return zero if all is good, EINVAL if not.
 201  */
 202 int
 203 udf_checktag(struct desc_tag *tag, uint16_t id)
 204 {
 205         uint8_t *itag;
 206         uint8_t i, cksum = 0;
 207
 208         itag = (uint8_t *)tag;
 209
 210         if (tag->id != id)
 211                 return(EINVAL);
 212
 213         for (i = 0; i < 15; i++)
 214                 cksum = cksum + itag[i];
 215         cksum = cksum - itag[4];
 216
 217         if (cksum == tag->cksum)
 218                 return(0);
 219
 220         return(EINVAL);
 221 }
 222
 223 static int
 224 udf_mountfs(struct vnode *devvp, struct mount *mp)
 225 {
 226         struct buf *bp = NULL;
 227         struct anchor_vdp avdp;
 228         struct udf_mnt *udfmp = NULL;
 229         struct part_desc *pd;
 230         struct logvol_desc *lvd;
 231         struct fileset_desc *fsd;
 232         struct file_entry *root_fentry;
 233         cdev_t dev;
 234         uint32_t sector, size, mvds_start, mvds_end;
 235         uint32_t fsd_offset = 0;
 236         uint16_t part_num = 0, fsd_part = 0;
 237         int error = EINVAL, needclose = 0;
 238         int logvol_found = 0, part_found = 0, fsd_found = 0;
 239         int bsize;
 240
 241         /*
 242          * Disallow multiple mounts of the same device. Flush the buffer
 243          * cache for the device.
 244          */
 245         if ((error = vfs_mountedon(devvp)))
 246                 return(error);
 247         if (count_udev(devvp->v_umajor, devvp->v_uminor) > 0)
 248                 return(EBUSY);
 249         if ((error = vinvalbuf(devvp, V_SAVE, 0, 0)))
 250                 return(error);
 251
 252         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
 253         error = VOP_OPEN(devvp, FREAD, FSCRED, NULL);
 254         vn_unlock(devvp);
 255         if (error)
 256                 return(error);
 257         needclose = 1;
 258         dev = devvp->v_rdev;
 259
 260         udfmp = kmalloc(sizeof(*udfmp), M_UDFMOUNT, M_WAITOK | M_ZERO);
 261
 262         mp->mnt_data = (qaddr_t)udfmp;
 263         mp->mnt_stat.f_fsid.val[0] = dev2udev(dev);
 264         mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
 265         mp->mnt_maxsymlinklen = 0;
 266         mp->mnt_flag |= MNT_LOCAL;
 267         udfmp->im_mountp = mp;
 268         udfmp->im_dev = dev;
 269         udfmp->im_devvp = devvp;
 270
 271         bsize = 2048;   /* XXX Should probe the media for it's size */
 272
 273         /*
 274          * Get the Anchor Volume Descriptor Pointer from sector 256.
 275          * XXX Should also check sector n - 256, n, and 512.
 276          */
 277         sector = 256;
 278         if ((error = bread(devvp, (off_t)sector * bsize, bsize, &bp)) != 0)
 279                 goto bail;
 280         if ((error = udf_checktag((struct desc_tag *)bp->b_data, TAGID_ANCHOR)))
 281                 goto bail;
 282
 283         bcopy(bp->b_data, &avdp, sizeof(struct anchor_vdp));
 284         brelse(bp);
 285         bp = NULL;
 286
 287         /*
 288          * Extract the Partition Descriptor and Logical Volume Descriptor
 289          * from the Volume Descriptor Sequence.
 290          * XXX Should we care about the partition type right now?
 291          * XXX What about multiple partitions?
 292          */
 293         mvds_start = avdp.main_vds_ex.loc;
 294         mvds_end = mvds_start + (avdp.main_vds_ex.len - 1) / bsize;
 295         for (sector = mvds_start; sector < mvds_end; sector++) {
 296                 if ((error = bread(devvp, (off_t)sector * bsize, bsize,
 297                                    &bp)) != 0) {
 298                         kprintf("Can't read sector %d of VDS\n", sector);
 299                         goto bail;
 300                 }
 301                 lvd = (struct logvol_desc *)bp->b_data;
 302                 if (!udf_checktag(&lvd->tag, TAGID_LOGVOL)) {
 303                         udfmp->bsize = lvd->lb_size;
 304                         udfmp->bmask = udfmp->bsize - 1;
 305                         udfmp->bshift = ffs(udfmp->bsize) - 1;
 306                         fsd_part = lvd->_lvd_use.fsd_loc.loc.part_num;
 307                         fsd_offset = lvd->_lvd_use.fsd_loc.loc.lb_num;
 308                         if (udf_find_partmaps(udfmp, lvd))
 309                                 break;
 310                         logvol_found = 1;
 311                 }
 312                 pd = (struct part_desc *)bp->b_data;
 313                 if (!udf_checktag(&pd->tag, TAGID_PARTITION)) {
 314                         part_found = 1;
 315                         part_num = pd->part_num;
 316                         udfmp->part_len = pd->part_len;
 317                         udfmp->part_start = pd->start_loc;
 318                 }
 319
 320                 brelse(bp);
 321                 bp = NULL;
 322                 if ((part_found) && (logvol_found))
 323                         break;
 324         }
 325
 326         if (!part_found || !logvol_found) {
 327                 error = EINVAL;
 328                 goto bail;
 329         }
 330
 331         if (fsd_part != part_num) {
 332                 kprintf("FSD does not lie within the partition!\n");
 333                 error = EINVAL;
 334                 goto bail;
 335         }
 336
 337
 338         /*
 339          * Grab the Fileset Descriptor
 340          * Thanks to Chuck McCrobie <mccrobie@cablespeed.com> for pointing
 341          * me in the right direction here.
 342          */
 343         sector = udfmp->part_start + fsd_offset;
 344         if ((error = RDSECTOR(devvp, sector, udfmp->bsize, &bp)) != 0) {
 345                 kprintf("Cannot read sector %d of FSD\n", sector);
 346                 goto bail;
 347         }
 348         fsd = (struct fileset_desc *)bp->b_data;
 349         if (!udf_checktag(&fsd->tag, TAGID_FSD)) {
 350                 fsd_found = 1;
 351                 bcopy(&fsd->rootdir_icb, &udfmp->root_icb,
 352                       sizeof(struct long_ad));
 353         }
 354
 355         brelse(bp);
 356         bp = NULL;
 357
 358         if (!fsd_found) {
 359                 kprintf("Couldn't find the fsd\n");
 360                 error = EINVAL;
 361                 goto bail;
 362         }
 363
 364         vfs_add_vnodeops(mp, &udf_vnode_vops, &mp->mnt_vn_norm_ops);
 365
 366         /*
 367          * Find the file entry for the root directory.
 368          */
 369         sector = udfmp->root_icb.loc.lb_num + udfmp->part_start;
 370         size = udfmp->root_icb.len;
 371         if ((error = udf_readlblks(udfmp, sector, size, &bp)) != 0) {
 372                 kprintf("Cannot read sector %d\n", sector);
 373                 goto bail;
 374         }
 375
 376         root_fentry = (struct file_entry *)bp->b_data;
 377         if ((error = udf_checktag(&root_fentry->tag, TAGID_FENTRY))) {
 378                 kprintf("Invalid root file entry!\n");
 379                 goto bail;
 380         }
 381
 382         brelse(bp);
 383         bp = NULL;
 384
 385         lwkt_token_init(&udfmp->hash_token);
 386         udfmp->hashtbl = phashinit(UDF_HASHTBLSIZE, M_UDFMOUNT, &udfmp->hashsz);
 387
 388         return(0);
 389
 390 bail:
 391         if (udfmp != NULL)
 392                 kfree(udfmp, M_UDFMOUNT);
 393         if (bp != NULL)
 394                 brelse(bp);
 395         if (needclose)
 396                 VOP_CLOSE(devvp, FREAD);
 397         return(error);
 398 }
 399
 400 static int
 401 udf_unmount(struct mount *mp, int mntflags)
 402 {
 403         struct udf_mnt *udfmp;
 404         int error, flags = 0;
 405
 406         udfmp = VFSTOUDFFS(mp);
 407
 408         if (mntflags & MNT_FORCE)
 409                 flags |= FORCECLOSE;
 410
 411         if ((error = vflush(mp, 0, flags)))
 412                 return (error);
 413
 414         udfmp->im_devvp->v_rdev->si_mountpoint = NULL;
 415         error = VOP_CLOSE(udfmp->im_devvp, FREAD);
 416         vrele(udfmp->im_devvp);
 417
 418         if (udfmp->s_table)
 419                 kfree(udfmp->s_table, M_UDFMOUNT);
 420         if (udfmp->hashtbl)
 421                 kfree(udfmp->hashtbl, M_UDFMOUNT);
 422         kfree(udfmp, M_UDFMOUNT);
 423
 424         mp->mnt_data = (qaddr_t)0;
 425         mp->mnt_flag &= ~MNT_LOCAL;
 426
 427         return (error);
 428 }
 429
 430 static int
 431 udf_root(struct mount *mp, struct vnode **vpp)
 432 {
 433         struct udf_mnt *udfmp;
 434         struct vnode *vp;
 435         ino_t id;
 436         int error;
 437
 438         udfmp = VFSTOUDFFS(mp);
 439
 440         id = udf_getid(&udfmp->root_icb);
 441
 442         error = udf_vget(mp, id, vpp);
 443         if (error)
 444                 return(error);
 445
 446         vp = *vpp;
 447         vp->v_flag |= VROOT;
 448         udfmp->root_vp = vp;
 449
 450         return(0);
 451 }
 452
 453 static int
 454 udf_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
 455 {
 456         struct udf_mnt *udfmp;
 457
 458         udfmp = VFSTOUDFFS(mp);
 459
 460         sbp->f_bsize = udfmp->bsize;
 461         sbp->f_iosize = udfmp->bsize;
 462         sbp->f_blocks = udfmp->part_len;
 463         sbp->f_bfree = 0;
 464         sbp->f_bavail = 0;
 465         sbp->f_files = 0;
 466         sbp->f_ffree = 0;
 467         if (sbp != &mp->mnt_stat) {
 468                 sbp->f_type = mp->mnt_vfc->vfc_typenum;
 469                 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
 470         }
 471
 472         return(0);
 473 }
 474
 475 int
 476 udf_vget(struct mount *mp, ino_t ino, struct vnode **vpp)
 477 {
 478         struct buf *bp;
 479         struct vnode *devvp;
 480         struct udf_mnt *udfmp;
 481         struct thread *td;
 482         struct vnode *vp;
 483         struct udf_node *unode;
 484         struct file_entry *fe;
 485         int error, sector, size;
 486
 487         td = curthread;
 488         udfmp = VFSTOUDFFS(mp);
 489
 490         /* See if we already have this in the cache */
 491         if ((error = udf_hashlookup(udfmp, ino, vpp)) != 0)
 492                 return(error);
 493         if (*vpp != NULL) {
 494                 return(0);
 495         }
 496
 497         /*
 498          * Allocate memory and check the tag id's before grabbing a new
 499          * vnode, since it's hard to roll back if there is a problem.
 500          */
 501         unode = kmalloc(sizeof(*unode), M_UDFNODE, M_WAITOK | M_ZERO);
 502
 503         /*
 504          * Copy in the file entry.  Per the spec, the size can only be 1 block.
 505          */
 506         sector = ino + udfmp->part_start;
 507         devvp = udfmp->im_devvp;
 508         if ((error = RDSECTOR(devvp, sector, udfmp->bsize, &bp)) != 0) {
 509                 kprintf("Cannot read sector %d\n", sector);
 510                 kfree(unode, M_UDFNODE);
 511                 return(error);
 512         }
 513
 514         fe = (struct file_entry *)bp->b_data;
 515         if (udf_checktag(&fe->tag, TAGID_FENTRY)) {
 516                 kprintf("Invalid file entry!\n");
 517                 kfree(unode, M_UDFNODE);
 518                 brelse(bp);
 519                 return(ENOMEM);
 520         }
 521         size = UDF_FENTRY_SIZE + fe->l_ea + fe->l_ad;
 522         unode->fentry = kmalloc(size, M_UDFFENTRY, M_WAITOK | M_ZERO);
 523
 524         bcopy(bp->b_data, unode->fentry, size);
 525
 526         brelse(bp);
 527         bp = NULL;
 528
 529         if ((error = udf_allocv(mp, &vp))) {
 530                 kprintf("Error from udf_allocv\n");
 531                 kfree(unode, M_UDFNODE);
 532                 return(error);
 533         }
 534
 535         unode->i_vnode = vp;
 536         unode->hash_id = ino;
 537         unode->i_devvp = udfmp->im_devvp;
 538         unode->i_dev = udfmp->im_dev;
 539         unode->udfmp = udfmp;
 540         vp->v_data = unode;
 541         vref(udfmp->im_devvp);
 542         udf_hashins(unode);
 543
 544         switch (unode->fentry->icbtag.file_type) {
 545         default:
 546                 vp->v_type = VBAD;
 547                 break;
 548         case 4:
 549                 vp->v_type = VDIR;
 550                 break;
 551         case 5:
 552                 vp->v_type = VREG;
 553                 break;
 554         case 6:
 555                 vp->v_type = VBLK;
 556                 break;
 557         case 7:
 558                 vp->v_type = VCHR;
 559                 break;
 560         case 9:
 561                 vp->v_type = VFIFO;
 562                 break;
 563         case 10:
 564                 vp->v_type = VSOCK;
 565                 break;
 566         case 12:
 567                 vp->v_type = VLNK;
 568                 break;
 569         }
 570         /*
 571          * Locked and refd vnode returned
 572          */
 573         *vpp = vp;
 574
 575         return(0);
 576 }
 577
 578 struct ifid {
 579         u_short ifid_len;
 580         u_short ifid_pad;
 581         int     ifid_ino;
 582         long    ifid_start;
 583 };
 584
 585 static int
 586 udf_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp)
 587 {
 588         struct ifid *ifhp;
 589         struct vnode *nvp;
 590         int error;
 591
 592         ifhp = (struct ifid *)fhp;
 593
 594         if ((error = VFS_VGET(mp, ifhp->ifid_ino, &nvp)) != 0) {
 595                 *vpp = NULLVP;
 596                 return(error);
 597         }
 598
 599         *vpp = nvp;
 600         return(0);
 601 }
 602
 603 static int
 604 udf_vptofh (struct vnode *vp, struct fid *fhp)
 605 {
 606         struct udf_node *node;
 607         struct ifid *ifhp;
 608
 609         node = VTON(vp);
 610         ifhp = (struct ifid *)fhp;
 611         ifhp->ifid_len = sizeof(struct ifid);
 612         ifhp->ifid_ino = node->hash_id;
 613
 614         return(0);
 615 }
 616
 617 static int
 618 udf_find_partmaps(struct udf_mnt *udfmp, struct logvol_desc *lvd)
 619 {
 620         union udf_pmap *pmap;
 621         struct part_map_spare *pms;
 622         struct regid *pmap_id;
 623         struct buf *bp;
 624         unsigned char regid_id[UDF_REGID_ID_SIZE + 1];
 625         int ptype, psize, error;
 626         unsigned int i;
 627
 628         for (i = 0; i < lvd->n_pm; i++) {
 629                 pmap = (union udf_pmap *)&lvd->maps[i * UDF_PMAP_SIZE];
 630                 ptype = pmap->data[0];
 631                 psize = pmap->data[1];
 632                 if (((ptype != 1) && (ptype != 2)) ||
 633                     ((psize != UDF_PMAP_SIZE) && (psize != 6))) {
 634                         kprintf("Invalid partition map found\n");
 635                         return(1);
 636                 }
 637
 638                 if (ptype == 1) {
 639                         /* Type 1 map.  We don't care */
 640                         continue;
 641                 }
 642
 643                 /* Type 2 map.  Gotta find out the details */
 644                 pmap_id = (struct regid *)&pmap->data[4];
 645                 bzero(&regid_id[0], UDF_REGID_ID_SIZE);
 646                 bcopy(&pmap_id->id[0], &regid_id[0], UDF_REGID_ID_SIZE);
 647
 648                 if (bcmp(&regid_id[0], "*UDF Sparable Partition",
 649                     UDF_REGID_ID_SIZE)) {
 650                         kprintf("Unsupported partition map: %s\n", &regid_id[0]);
 651                         return(1);
 652                 }
 653
 654                 pms = &pmap->pms;
 655                 udfmp->s_table = kmalloc(pms->st_size, M_UDFMOUNT,
 656                                         M_WAITOK | M_ZERO);
 657
 658                 /* Calculate the number of sectors per packet. */
 659                 /* XXX Logical or physical? */
 660                 udfmp->p_sectors = pms->packet_len / udfmp->bsize;
 661
 662                 /*
 663                  * XXX If reading the first Sparing Table fails, should look
 664                  * for another table.
 665                  */
 666                 if ((error = udf_readlblks(udfmp, pms->st_loc[0], pms->st_size,
 667                     &bp)) != 0) {
 668                         if (bp)
 669                                 brelse(bp);
 670                         kprintf("Failed to read Sparing Table at sector %d\n",
 671                             pms->st_loc[0]);
 672                         return(error);
 673                 }
 674                 bcopy(bp->b_data, udfmp->s_table, pms->st_size);
 675                 brelse(bp);
 676
 677                 if (udf_checktag(&udfmp->s_table->tag, 0)) {
 678                         kprintf("Invalid sparing table found\n");
 679                         return(EINVAL);
 680                 }
 681
 682                 /* See how many valid entries there are here.  The list is
 683                  * supposed to be sorted. 0xfffffff0 and higher are not valid
 684                  */
 685                 for (i = 0; i < udfmp->s_table->rt_l; i++) {
 686                         udfmp->s_table_entries = i;
 687                         if (udfmp->s_table->entries[i].org >= 0xfffffff0)
 688                                 break;
 689                 }
 690         }
 691
 692         return(0);
 693 }