fs/udf/super.c

   1 /*
   2  * super.c
   3  *
   4  * PURPOSE
   5  *  Super block routines for the OSTA-UDF(tm) filesystem.
   6  *
   7  * DESCRIPTION
   8  *  OSTA-UDF(tm) = Optical Storage Technology Association
   9  *  Universal Disk Format.
  10  *
  11  *  This code is based on version 2.00 of the UDF specification,
  12  *  and revision 3 of the ECMA 167 standard [equivalent to ISO 13346].
  13  *    http://www.osta.org/
  14  *    http://www.ecma.ch/
  15  *    http://www.iso.org/
  16  *
  17  * CONTACTS
  18  *  E-mail regarding any portion of the Linux UDF file system should be
  19  *  directed to the development team mailing list (run by majordomo):
  20  *        linux_udf@hpesjro.fc.hp.com
  21  *
  22  * COPYRIGHT
  23  *  This file is distributed under the terms of the GNU General Public
  24  *  License (GPL). Copies of the GPL can be obtained from:
  25  *    ftp://prep.ai.mit.edu/pub/gnu/GPL
  26  *  Each contributing author retains all rights to their own work.
  27  *
  28  *  (C) 1998 Dave Boynton
  29  *  (C) 1998-2004 Ben Fennema
  30  *  (C) 2000 Stelias Computing Inc
  31  *
  32  * HISTORY
  33  *
  34  *  09/24/98 dgb  changed to allow compiling outside of kernel, and
  35  *                added some debugging.
  36  *  10/01/98 dgb  updated to allow (some) possibility of compiling w/2.0.34
  37  *  10/16/98      attempting some multi-session support
  38  *  10/17/98      added freespace count for "df"
  39  *  11/11/98 gr   added novrs option
  40  *  11/26/98 dgb  added fileset,anchor mount options
  41  *  12/06/98 blf  really hosed things royally. vat/sparing support. sequenced vol descs
  42  *                rewrote option handling based on isofs
  43  *  12/20/98      find the free space bitmap (if it exists)
  44  */
  45
  46 #include "udfdecl.h"
  47
  48 #include <linux/config.h>
  49 #include <linux/blkdev.h>
  50 #include <linux/slab.h>
  51 #include <linux/kernel.h>
  52 #include <linux/module.h>
  53 #include <linux/parser.h>
  54 #include <linux/stat.h>
  55 #include <linux/cdrom.h>
  56 #include <linux/nls.h>
  57 #include <linux/smp_lock.h>
  58 #include <linux/buffer_head.h>
  59 #include <linux/vfs.h>
  60 #include <linux/vmalloc.h>
  61 #include <asm/byteorder.h>
  62
  63 #include <linux/udf_fs.h>
  64 #include "udf_sb.h"
  65 #include "udf_i.h"
  66
  67 #include <linux/init.h>
  68 #include <asm/uaccess.h>
  69
  70 #define VDS_POS_PRIMARY_VOL_DESC        0
  71 #define VDS_POS_UNALLOC_SPACE_DESC      1
  72 #define VDS_POS_LOGICAL_VOL_DESC        2
  73 #define VDS_POS_PARTITION_DESC          3
  74 #define VDS_POS_IMP_USE_VOL_DESC        4
  75 #define VDS_POS_VOL_DESC_PTR            5
  76 #define VDS_POS_TERMINATING_DESC        6
  77 #define VDS_POS_LENGTH                  7
  78
  79 static char error_buf[1024];
  80
  81 /* These are the "meat" - everything else is stuffing */
  82 static int udf_fill_super(struct super_block *, void *, int);
  83 static void udf_put_super(struct super_block *);
  84 static void udf_write_super(struct super_block *);
  85 static int udf_remount_fs(struct super_block *, int *, char *);
  86 static int udf_check_valid(struct super_block *, int, int);
  87 static int udf_vrs(struct super_block *sb, int silent);
  88 static int udf_load_partition(struct super_block *, kernel_lb_addr *);
  89 static int udf_load_logicalvol(struct super_block *, struct buffer_head *, kernel_lb_addr *);
  90 static void udf_load_logicalvolint(struct super_block *, kernel_extent_ad);
  91 static void udf_find_anchor(struct super_block *);
  92 static int udf_find_fileset(struct super_block *, kernel_lb_addr *, kernel_lb_addr *);
  93 static void udf_load_pvoldesc(struct super_block *, struct buffer_head *);
  94 static void udf_load_fileset(struct super_block *, struct buffer_head *, kernel_lb_addr *);
  95 static void udf_load_partdesc(struct super_block *, struct buffer_head *);
  96 static void udf_open_lvid(struct super_block *);
  97 static void udf_close_lvid(struct super_block *);
  98 static unsigned int udf_count_free(struct super_block *);
  99 static int udf_statfs(struct super_block *, struct kstatfs *);
 100
 101 /* UDF filesystem type */
 102 static struct super_block *udf_get_sb(struct file_system_type *fs_type,
 103         int flags, const char *dev_name, void *data)
 104 {
 105         return get_sb_bdev(fs_type, flags, dev_name, data, udf_fill_super);
 106 }
 107
 108 static struct file_system_type udf_fstype = {
 109         .owner          = THIS_MODULE,
 110         .name           = "udf",
 111         .get_sb         = udf_get_sb,
 112         .kill_sb        = kill_block_super,
 113         .fs_flags       = FS_REQUIRES_DEV,
 114 };
 115
 116 static kmem_cache_t * udf_inode_cachep;
 117
 118 static struct inode *udf_alloc_inode(struct super_block *sb)
 119 {
 120         struct udf_inode_info *ei;
 121         ei = (struct udf_inode_info *)kmem_cache_alloc(udf_inode_cachep, SLAB_KERNEL);
 122         if (!ei)
 123                 return NULL;
 124         return &ei->vfs_inode;
 125 }
 126
 127 static void udf_destroy_inode(struct inode *inode)
 128 {
 129         kmem_cache_free(udf_inode_cachep, UDF_I(inode));
 130 }
 131
 132 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
 133 {
 134         struct udf_inode_info *ei = (struct udf_inode_info *) foo;
 135
 136         if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
 137             SLAB_CTOR_CONSTRUCTOR)
 138         {
 139                 ei->i_ext.i_data = NULL;
 140                 inode_init_once(&ei->vfs_inode);
 141         }
 142 }
 143
 144 static int init_inodecache(void)
 145 {
 146         udf_inode_cachep = kmem_cache_create("udf_inode_cache",
 147                                              sizeof(struct udf_inode_info),
 148                                              0, SLAB_RECLAIM_ACCOUNT,
 149                                              init_once, NULL);
 150         if (udf_inode_cachep == NULL)
 151                 return -ENOMEM;
 152         return 0;
 153 }
 154
 155 static void destroy_inodecache(void)
 156 {
 157         if (kmem_cache_destroy(udf_inode_cachep))
 158                 printk(KERN_INFO "udf_inode_cache: not all structures were freed\n");
 159 }
 160
 161 /* Superblock operations */
 162 static struct super_operations udf_sb_ops = {
 163         .alloc_inode            = udf_alloc_inode,
 164         .destroy_inode          = udf_destroy_inode,
 165         .write_inode            = udf_write_inode,
 166         .delete_inode           = udf_delete_inode,
 167         .clear_inode            = udf_clear_inode,
 168         .put_super              = udf_put_super,
 169         .write_super            = udf_write_super,
 170         .statfs                 = udf_statfs,
 171         .remount_fs             = udf_remount_fs,
 172 };
 173
 174 struct udf_options
 175 {
 176         unsigned char novrs;
 177         unsigned int blocksize;
 178         unsigned int session;
 179         unsigned int lastblock;
 180         unsigned int anchor;
 181         unsigned int volume;
 182         unsigned short partition;
 183         unsigned int fileset;
 184         unsigned int rootdir;
 185         unsigned int flags;
 186         mode_t umask;
 187         gid_t gid;
 188         uid_t uid;
 189         struct nls_table *nls_map;
 190 };
 191
 192 static int __init init_udf_fs(void)
 193 {
 194         int err;
 195         err = init_inodecache();
 196         if (err)
 197                 goto out1;
 198         err = register_filesystem(&udf_fstype);
 199         if (err)
 200                 goto out;
 201         return 0;
 202 out:
 203         destroy_inodecache();
 204 out1:
 205         return err;
 206 }
 207
 208 static void __exit exit_udf_fs(void)
 209 {
 210         unregister_filesystem(&udf_fstype);
 211         destroy_inodecache();
 212 }
 213
 214 module_init(init_udf_fs)
 215 module_exit(exit_udf_fs)
 216
 217 /*
 218  * udf_parse_options
 219  *
 220  * PURPOSE
 221  *      Parse mount options.
 222  *
 223  * DESCRIPTION
 224  *      The following mount options are supported:
 225  *
 226  *      gid=            Set the default group.
 227  *      umask=          Set the default umask.
 228  *      uid=            Set the default user.
 229  *      bs=             Set the block size.
 230  *      unhide          Show otherwise hidden files.
 231  *      undelete        Show deleted files in lists.
 232  *      adinicb         Embed data in the inode (default)
 233  *      noadinicb       Don't embed data in the inode
 234  *      shortad         Use short ad's
 235  *      longad          Use long ad's (default)
 236  *      nostrict        Unset strict conformance
 237  *      iocharset=      Set the NLS character set
 238  *
 239  *      The remaining are for debugging and disaster recovery:
 240  *
 241  *      novrs           Skip volume sequence recognition
 242  *
 243  *      The following expect a offset from 0.
 244  *
 245  *      session=        Set the CDROM session (default= last session)
 246  *      anchor=         Override standard anchor location. (default= 256)
 247  *      volume=         Override the VolumeDesc location. (unused)
 248  *      partition=      Override the PartitionDesc location. (unused)
 249  *      lastblock=      Set the last block of the filesystem/
 250  *
 251  *      The following expect a offset from the partition root.
 252  *
 253  *      fileset=        Override the fileset block location. (unused)
 254  *      rootdir=        Override the root directory location. (unused)
 255  *              WARNING: overriding the rootdir to a non-directory may
 256  *              yield highly unpredictable results.
 257  *
 258  * PRE-CONDITIONS
 259  *      options         Pointer to mount options string.
 260  *      uopts           Pointer to mount options variable.
 261  *
 262  * POST-CONDITIONS
 263  *      <return>        1       Mount options parsed okay.
 264  *      <return>        0       Error parsing mount options.
 265  *
 266  * HISTORY
 267  *      July 1, 1997 - Andrew E. Mileski
 268  *      Written, tested, and released.
 269  */
 270
 271 enum {
 272         Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
 273         Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
 274         Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
 275         Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
 276         Opt_rootdir, Opt_utf8, Opt_iocharset,
 277         Opt_err
 278 };
 279
 280 static match_table_t tokens = {
 281         {Opt_novrs, "novrs"},
 282         {Opt_nostrict, "nostrict"},
 283         {Opt_bs, "bs=%u"},
 284         {Opt_unhide, "unhide"},
 285         {Opt_undelete, "undelete"},
 286         {Opt_noadinicb, "noadinicb"},
 287         {Opt_adinicb, "adinicb"},
 288         {Opt_shortad, "shortad"},
 289         {Opt_longad, "longad"},
 290         {Opt_gid, "gid=%u"},
 291         {Opt_uid, "uid=%u"},
 292         {Opt_umask, "umask=%o"},
 293         {Opt_session, "session=%u"},
 294         {Opt_lastblock, "lastblock=%u"},
 295         {Opt_anchor, "anchor=%u"},
 296         {Opt_volume, "volume=%u"},
 297         {Opt_partition, "partition=%u"},
 298         {Opt_fileset, "fileset=%u"},
 299         {Opt_rootdir, "rootdir=%u"},
 300         {Opt_utf8, "utf8"},
 301         {Opt_iocharset, "iocharset=%s"},
 302         {Opt_err, NULL}
 303 };
 304
 305 static int
 306 udf_parse_options(char *options, struct udf_options *uopt)
 307 {
 308         char *p;
 309         int option;
 310
 311         uopt->novrs = 0;
 312         uopt->blocksize = 2048;
 313         uopt->partition = 0xFFFF;
 314         uopt->session = 0xFFFFFFFF;
 315         uopt->lastblock = 0;
 316         uopt->anchor = 0;
 317         uopt->volume = 0xFFFFFFFF;
 318         uopt->rootdir = 0xFFFFFFFF;
 319         uopt->fileset = 0xFFFFFFFF;
 320         uopt->nls_map = NULL;
 321
 322         if (!options)
 323                 return 1;
 324
 325         while ((p = strsep(&options, ",")) != NULL)
 326         {
 327                 substring_t args[MAX_OPT_ARGS];
 328                 int token;
 329                 if (!*p)
 330                         continue;
 331
 332                 token = match_token(p, tokens, args);
 333                 switch (token)
 334                 {
 335                         case Opt_novrs:
 336                                 uopt->novrs = 1;
 337                         case Opt_bs:
 338                                 if (match_int(&args[0], &option))
 339                                         return 0;
 340                                 uopt->blocksize = option;
 341                                 break;
 342                         case Opt_unhide:
 343                                 uopt->flags |= (1 << UDF_FLAG_UNHIDE);
 344                                 break;
 345                         case Opt_undelete:
 346                                 uopt->flags |= (1 << UDF_FLAG_UNDELETE);
 347                                 break;
 348                         case Opt_noadinicb:
 349                                 uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
 350                                 break;
 351                         case Opt_adinicb:
 352                                 uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
 353                                 break;
 354                         case Opt_shortad:
 355                                 uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
 356                                 break;
 357                         case Opt_longad:
 358                                 uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
 359                                 break;
 360                         case Opt_gid:
 361                                 if (match_int(args, &option))
 362                                         return 0;
 363                                 uopt->gid = option;
 364                                 break;
 365                         case Opt_uid:
 366                                 if (match_int(args, &option))
 367                                         return 0;
 368                                 uopt->uid = option;
 369                                 break;
 370                         case Opt_umask:
 371                                 if (match_octal(args, &option))
 372                                         return 0;
 373                                 uopt->umask = option;
 374                                 break;
 375                         case Opt_nostrict:
 376                                 uopt->flags &= ~(1 << UDF_FLAG_STRICT);
 377                                 break;
 378                         case Opt_session:
 379                                 if (match_int(args, &option))
 380                                         return 0;
 381                                 uopt->session = option;
 382                                 break;
 383                         case Opt_lastblock:
 384                                 if (match_int(args, &option))
 385                                         return 0;
 386                                 uopt->lastblock = option;
 387                                 break;
 388                         case Opt_anchor:
 389                                 if (match_int(args, &option))
 390                                         return 0;
 391                                 uopt->anchor = option;
 392                                 break;
 393                         case Opt_volume:
 394                                 if (match_int(args, &option))
 395                                         return 0;
 396                                 uopt->volume = option;
 397                                 break;
 398                         case Opt_partition:
 399                                 if (match_int(args, &option))
 400                                         return 0;
 401                                 uopt->partition = option;
 402                                 break;
 403                         case Opt_fileset:
 404                                 if (match_int(args, &option))
 405                                         return 0;
 406                                 uopt->fileset = option;
 407                                 break;
 408                         case Opt_rootdir:
 409                                 if (match_int(args, &option))
 410                                         return 0;
 411                                 uopt->rootdir = option;
 412                                 break;
 413                         case Opt_utf8:
 414                                 uopt->flags |= (1 << UDF_FLAG_UTF8);
 415                                 break;
 416 #ifdef CONFIG_UDF_NLS
 417                         case Opt_iocharset:
 418                                 uopt->nls_map = load_nls(args[0].from);
 419                                 uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
 420                                 break;
 421 #endif
 422                         default:
 423                                 printk(KERN_ERR "udf: bad mount option \"%s\" "
 424                                                 "or missing value\n", p);
 425                         return 0;
 426                 }
 427         }
 428         return 1;
 429 }
 430
 431 void
 432 udf_write_super(struct super_block *sb)
 433 {
 434         lock_kernel();
 435         if (!(sb->s_flags & MS_RDONLY))
 436                 udf_open_lvid(sb);
 437         sb->s_dirt = 0;
 438         unlock_kernel();
 439 }
 440
 441 static int
 442 udf_remount_fs(struct super_block *sb, int *flags, char *options)
 443 {
 444         struct udf_options uopt;
 445
 446         uopt.flags = UDF_SB(sb)->s_flags ;
 447         uopt.uid   = UDF_SB(sb)->s_uid ;
 448         uopt.gid   = UDF_SB(sb)->s_gid ;
 449         uopt.umask = UDF_SB(sb)->s_umask ;
 450
 451         if ( !udf_parse_options(options, &uopt) )
 452                 return -EINVAL;
 453
 454         UDF_SB(sb)->s_flags = uopt.flags;
 455         UDF_SB(sb)->s_uid   = uopt.uid;
 456         UDF_SB(sb)->s_gid   = uopt.gid;
 457         UDF_SB(sb)->s_umask = uopt.umask;
 458
 459         if (UDF_SB_LVIDBH(sb)) {
 460                 int write_rev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev);
 461                 if (write_rev > UDF_MAX_WRITE_VERSION)
 462                         *flags |= MS_RDONLY;
 463         }
 464
 465         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 466                 return 0;
 467         if (*flags & MS_RDONLY)
 468                 udf_close_lvid(sb);
 469         else
 470                 udf_open_lvid(sb);
 471
 472         return 0;
 473 }
 474
 475 /*
 476  * udf_set_blocksize
 477  *
 478  * PURPOSE
 479  *      Set the block size to be used in all transfers.
 480  *
 481  * DESCRIPTION
 482  *      To allow room for a DMA transfer, it is best to guess big when unsure.
 483  *      This routine picks 2048 bytes as the blocksize when guessing. This
 484  *      should be adequate until devices with larger block sizes become common.
 485  *
 486  *      Note that the Linux kernel can currently only deal with blocksizes of
 487  *      512, 1024, 2048, 4096, and 8192 bytes.
 488  *
 489  * PRE-CONDITIONS
 490  *      sb                      Pointer to _locked_ superblock.
 491  *
 492  * POST-CONDITIONS
 493  *      sb->s_blocksize         Blocksize.
 494  *      sb->s_blocksize_bits    log2 of blocksize.
 495  *      <return>        0       Blocksize is valid.
 496  *      <return>        1       Blocksize is invalid.
 497  *
 498  * HISTORY
 499  *      July 1, 1997 - Andrew E. Mileski
 500  *      Written, tested, and released.
 501  */
 502 static  int
 503 udf_set_blocksize(struct super_block *sb, int bsize)
 504 {
 505         if (!sb_min_blocksize(sb, bsize)) {
 506                 udf_debug("Bad block size (%d)\n", bsize);
 507                 printk(KERN_ERR "udf: bad block size (%d)\n", bsize);
 508                 return 0;
 509         }
 510         return sb->s_blocksize;
 511 }
 512
 513 static int
 514 udf_vrs(struct super_block *sb, int silent)
 515 {
 516         struct volStructDesc *vsd = NULL;
 517         int sector = 32768;
 518         int sectorsize;
 519         struct buffer_head *bh = NULL;
 520         int iso9660=0;
 521         int nsr02=0;
 522         int nsr03=0;
 523
 524         /* Block size must be a multiple of 512 */
 525         if (sb->s_blocksize & 511)
 526                 return 0;
 527
 528         if (sb->s_blocksize < sizeof(struct volStructDesc))
 529                 sectorsize = sizeof(struct volStructDesc);
 530         else
 531                 sectorsize = sb->s_blocksize;
 532
 533         sector += (UDF_SB_SESSION(sb) << sb->s_blocksize_bits);
 534
 535         udf_debug("Starting at sector %u (%ld byte sectors)\n",
 536                 (sector >> sb->s_blocksize_bits), sb->s_blocksize);
 537         /* Process the sequence (if applicable) */
 538         for (;!nsr02 && !nsr03; sector += sectorsize)
 539         {
 540                 /* Read a block */
 541                 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
 542                 if (!bh)
 543                         break;
 544
 545                 /* Look for ISO  descriptors */
 546                 vsd = (struct volStructDesc *)(bh->b_data +
 547                         (sector & (sb->s_blocksize - 1)));
 548
 549                 if (vsd->stdIdent[0] == 0)
 550                 {
 551                         udf_release_data(bh);
 552                         break;
 553                 }
 554                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001, VSD_STD_ID_LEN))
 555                 {
 556                         iso9660 = sector;
 557                         switch (vsd->structType)
 558                         {
 559                                 case 0:
 560                                         udf_debug("ISO9660 Boot Record found\n");
 561                                         break;
 562                                 case 1:
 563                                         udf_debug("ISO9660 Primary Volume Descriptor found\n");
 564                                         break;
 565                                 case 2:
 566                                         udf_debug("ISO9660 Supplementary Volume Descriptor found\n");
 567                                         break;
 568                                 case 3:
 569                                         udf_debug("ISO9660 Volume Partition Descriptor found\n");
 570                                         break;
 571                                 case 255:
 572                                         udf_debug("ISO9660 Volume Descriptor Set Terminator found\n");
 573                                         break;
 574                                 default:
 575                                         udf_debug("ISO9660 VRS (%u) found\n", vsd->structType);
 576                                         break;
 577                         }
 578                 }
 579                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01, VSD_STD_ID_LEN))
 580                 {
 581                 }
 582                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01, VSD_STD_ID_LEN))
 583                 {
 584                         udf_release_data(bh);
 585                         break;
 586                 }
 587                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02, VSD_STD_ID_LEN))
 588                 {
 589                         nsr02 = sector;
 590                 }
 591                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03, VSD_STD_ID_LEN))
 592                 {
 593                         nsr03 = sector;
 594                 }
 595                 udf_release_data(bh);
 596         }
 597
 598         if (nsr03)
 599                 return nsr03;
 600         else if (nsr02)
 601                 return nsr02;
 602         else if (sector - (UDF_SB_SESSION(sb) << sb->s_blocksize_bits) == 32768)
 603                 return -1;
 604         else
 605                 return 0;
 606 }
 607
 608 /*
 609  * udf_find_anchor
 610  *
 611  * PURPOSE
 612  *      Find an anchor volume descriptor.
 613  *
 614  * PRE-CONDITIONS
 615  *      sb                      Pointer to _locked_ superblock.
 616  *      lastblock               Last block on media.
 617  *
 618  * POST-CONDITIONS
 619  *      <return>                1 if not found, 0 if ok
 620  *
 621  * HISTORY
 622  *      July 1, 1997 - Andrew E. Mileski
 623  *      Written, tested, and released.
 624  */
 625 static void
 626 udf_find_anchor(struct super_block *sb)
 627 {
 628         int lastblock = UDF_SB_LASTBLOCK(sb);
 629         struct buffer_head *bh = NULL;
 630         uint16_t ident;
 631         uint32_t location;
 632         int i;
 633
 634         if (lastblock)
 635         {
 636                 int varlastblock = udf_variable_to_fixed(lastblock);
 637                 int last[] =  { lastblock, lastblock - 2,
 638                                 lastblock - 150, lastblock - 152,
 639                                 varlastblock, varlastblock - 2,
 640                                 varlastblock - 150, varlastblock - 152 };
 641
 642                 lastblock = 0;
 643
 644                 /* Search for an anchor volume descriptor pointer */
 645
 646                 /*  according to spec, anchor is in either:
 647                  *     block 256
 648                  *     lastblock-256
 649                  *     lastblock
 650                  *  however, if the disc isn't closed, it could be 512 */
 651
 652                 for (i=0; (!lastblock && i<sizeof(last)/sizeof(int)); i++)
 653                 {
 654                         if (last[i] < 0 || !(bh = sb_bread(sb, last[i])))
 655                         {
 656                                 ident = location = 0;
 657                         }
 658                         else
 659                         {
 660                                 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
 661                                 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
 662                                 udf_release_data(bh);
 663                         }
 664
 665                         if (ident == TAG_IDENT_AVDP)
 666                         {
 667                                 if (location == last[i] - UDF_SB_SESSION(sb))
 668                                 {
 669                                         lastblock = UDF_SB_ANCHOR(sb)[0] = last[i] - UDF_SB_SESSION(sb);
 670                                         UDF_SB_ANCHOR(sb)[1] = last[i] - 256 - UDF_SB_SESSION(sb);
 671                                 }
 672                                 else if (location == udf_variable_to_fixed(last[i]) - UDF_SB_SESSION(sb))
 673                                 {
 674                                         UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
 675                                         lastblock = UDF_SB_ANCHOR(sb)[0] = udf_variable_to_fixed(last[i]) - UDF_SB_SESSION(sb);
 676                                         UDF_SB_ANCHOR(sb)[1] = lastblock - 256 - UDF_SB_SESSION(sb);
 677                                 }
 678                                 else
 679                                         udf_debug("Anchor found at block %d, location mismatch %d.\n",
 680                                                 last[i], location);
 681                         }
 682                         else if (ident == TAG_IDENT_FE || ident == TAG_IDENT_EFE)
 683                         {
 684                                 lastblock = last[i];
 685                                 UDF_SB_ANCHOR(sb)[3] = 512;
 686                         }
 687                         else
 688                         {
 689                                 if (last[i] < 256 || !(bh = sb_bread(sb, last[i] - 256)))
 690                                 {
 691                                         ident = location = 0;
 692                                 }
 693                                 else
 694                                 {
 695                                         ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
 696                                         location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
 697                                         udf_release_data(bh);
 698                                 }
 699
 700                                 if (ident == TAG_IDENT_AVDP &&
 701                                         location == last[i] - 256 - UDF_SB_SESSION(sb))
 702                                 {
 703                                         lastblock = last[i];
 704                                         UDF_SB_ANCHOR(sb)[1] = last[i] - 256;
 705                                 }
 706                                 else
 707                                 {
 708                                         if (last[i] < 312 + UDF_SB_SESSION(sb) || !(bh = sb_bread(sb, last[i] - 312 - UDF_SB_SESSION(sb))))
 709                                         {
 710                                                 ident = location = 0;
 711                                         }
 712                                         else
 713                                         {
 714                                                 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
 715                                                 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
 716                                                 udf_release_data(bh);
 717                                         }
 718
 719                                         if (ident == TAG_IDENT_AVDP &&
 720                                                 location == udf_variable_to_fixed(last[i]) - 256)
 721                                         {
 722                                                 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
 723                                                 lastblock = udf_variable_to_fixed(last[i]);
 724                                                 UDF_SB_ANCHOR(sb)[1] = lastblock - 256;
 725                                         }
 726                                 }
 727                         }
 728                 }
 729         }
 730
 731         if (!lastblock)
 732         {
 733                 /* We havn't found the lastblock. check 312 */
 734                 if ((bh = sb_bread(sb, 312 + UDF_SB_SESSION(sb))))
 735                 {
 736                         ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
 737                         location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
 738                         udf_release_data(bh);
 739
 740                         if (ident == TAG_IDENT_AVDP && location == 256)
 741                                 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
 742                 }
 743         }
 744
 745         for (i=0; i<sizeof(UDF_SB_ANCHOR(sb))/sizeof(int); i++)
 746         {
 747                 if (UDF_SB_ANCHOR(sb)[i])
 748                 {
 749                         if (!(bh = udf_read_tagged(sb,
 750                                 UDF_SB_ANCHOR(sb)[i], UDF_SB_ANCHOR(sb)[i], &ident)))
 751                         {
 752                                 UDF_SB_ANCHOR(sb)[i] = 0;
 753                         }
 754                         else
 755                         {
 756                                 udf_release_data(bh);
 757                                 if ((ident != TAG_IDENT_AVDP) && (i ||
 758                                         (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE)))
 759                                 {
 760                                         UDF_SB_ANCHOR(sb)[i] = 0;
 761                                 }
 762                         }
 763                 }
 764         }
 765
 766         UDF_SB_LASTBLOCK(sb) = lastblock;
 767 }
 768
 769 static int
 770 udf_find_fileset(struct super_block *sb, kernel_lb_addr *fileset, kernel_lb_addr *root)
 771 {
 772         struct buffer_head *bh = NULL;
 773         long lastblock;
 774         uint16_t ident;
 775
 776         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
 777                 fileset->partitionReferenceNum != 0xFFFF)
 778         {
 779                 bh = udf_read_ptagged(sb, *fileset, 0, &ident);
 780
 781                 if (!bh)
 782                         return 1;
 783                 else if (ident != TAG_IDENT_FSD)
 784                 {
 785                         udf_release_data(bh);
 786                         return 1;
 787                 }
 788
 789         }
 790
 791         if (!bh) /* Search backwards through the partitions */
 792         {
 793                 kernel_lb_addr newfileset;
 794
 795                 return 1;
 796
 797                 for (newfileset.partitionReferenceNum=UDF_SB_NUMPARTS(sb)-1;
 798                         (newfileset.partitionReferenceNum != 0xFFFF &&
 799                                 fileset->logicalBlockNum == 0xFFFFFFFF &&
 800                                 fileset->partitionReferenceNum == 0xFFFF);
 801                         newfileset.partitionReferenceNum--)
 802                 {
 803                         lastblock = UDF_SB_PARTLEN(sb, newfileset.partitionReferenceNum);
 804                         newfileset.logicalBlockNum = 0;
 805
 806                         do
 807                         {
 808                                 bh = udf_read_ptagged(sb, newfileset, 0, &ident);
 809                                 if (!bh)
 810                                 {
 811                                         newfileset.logicalBlockNum ++;
 812                                         continue;
 813                                 }
 814
 815                                 switch (ident)
 816                                 {
 817                                         case TAG_IDENT_SBD:
 818                                         {
 819                                                 struct spaceBitmapDesc *sp;
 820                                                 sp = (struct spaceBitmapDesc *)bh->b_data;
 821                                                 newfileset.logicalBlockNum += 1 +
 822                                                         ((le32_to_cpu(sp->numOfBytes) + sizeof(struct spaceBitmapDesc) - 1)
 823                                                                 >> sb->s_blocksize_bits);
 824                                                 udf_release_data(bh);
 825                                                 break;
 826                                         }
 827                                         case TAG_IDENT_FSD:
 828                                         {
 829                                                 *fileset = newfileset;
 830                                                 break;
 831                                         }
 832                                         default:
 833                                         {
 834                                                 newfileset.logicalBlockNum ++;
 835                                                 udf_release_data(bh);
 836                                                 bh = NULL;
 837                                                 break;
 838                                         }
 839                                 }
 840                         }
 841                         while (newfileset.logicalBlockNum < lastblock &&
 842                                 fileset->logicalBlockNum == 0xFFFFFFFF &&
 843                                 fileset->partitionReferenceNum == 0xFFFF);
 844                 }
 845         }
 846
 847         if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
 848                 fileset->partitionReferenceNum != 0xFFFF) && bh)
 849         {
 850                 udf_debug("Fileset at block=%d, partition=%d\n",
 851                         fileset->logicalBlockNum, fileset->partitionReferenceNum);
 852
 853                 UDF_SB_PARTITION(sb) = fileset->partitionReferenceNum;
 854                 udf_load_fileset(sb, bh, root);
 855                 udf_release_data(bh);
 856                 return 0;
 857         }
 858         return 1;
 859 }
 860
 861 static void
 862 udf_load_pvoldesc(struct super_block *sb, struct buffer_head *bh)
 863 {
 864         struct primaryVolDesc *pvoldesc;
 865         time_t recording;
 866         long recording_usec;
 867         struct ustr instr;
 868         struct ustr outstr;
 869
 870         pvoldesc = (struct primaryVolDesc *)bh->b_data;
 871
 872         if ( udf_stamp_to_time(&recording, &recording_usec,
 873                 lets_to_cpu(pvoldesc->recordingDateAndTime)) )
 874         {
 875                 kernel_timestamp ts;
 876                 ts = lets_to_cpu(pvoldesc->recordingDateAndTime);
 877                 udf_debug("recording time %ld/%ld, %04u/%02u/%02u %02u:%02u (%x)\n",
 878                         recording, recording_usec,
 879                         ts.year, ts.month, ts.day, ts.hour, ts.minute, ts.typeAndTimezone);
 880                 UDF_SB_RECORDTIME(sb).tv_sec = recording;
 881                 UDF_SB_RECORDTIME(sb).tv_nsec = recording_usec * 1000;
 882         }
 883
 884         if ( !udf_build_ustr(&instr, pvoldesc->volIdent, 32) )
 885         {
 886                 if (udf_CS0toUTF8(&outstr, &instr))
 887                 {
 888                         strncpy( UDF_SB_VOLIDENT(sb), outstr.u_name,
 889                                 outstr.u_len > 31 ? 31 : outstr.u_len);
 890                         udf_debug("volIdent[] = '%s'\n", UDF_SB_VOLIDENT(sb));
 891                 }
 892         }
 893
 894         if ( !udf_build_ustr(&instr, pvoldesc->volSetIdent, 128) )
 895         {
 896                 if (udf_CS0toUTF8(&outstr, &instr))
 897                         udf_debug("volSetIdent[] = '%s'\n", outstr.u_name);
 898         }
 899 }
 900
 901 static void
 902 udf_load_fileset(struct super_block *sb, struct buffer_head *bh, kernel_lb_addr *root)
 903 {
 904         struct fileSetDesc *fset;
 905
 906         fset = (struct fileSetDesc *)bh->b_data;
 907
 908         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
 909
 910         UDF_SB_SERIALNUM(sb) = le16_to_cpu(fset->descTag.tagSerialNum);
 911
 912         udf_debug("Rootdir at block=%d, partition=%d\n",
 913                 root->logicalBlockNum, root->partitionReferenceNum);
 914 }
 915
 916 static void
 917 udf_load_partdesc(struct super_block *sb, struct buffer_head *bh)
 918 {
 919         struct partitionDesc *p;
 920         int i;
 921
 922         p = (struct partitionDesc *)bh->b_data;
 923
 924         for (i=0; i<UDF_SB_NUMPARTS(sb); i++)
 925         {
 926                 udf_debug("Searching map: (%d == %d)\n",
 927                         UDF_SB_PARTMAPS(sb)[i].s_partition_num, le16_to_cpu(p->partitionNumber));
 928                 if (UDF_SB_PARTMAPS(sb)[i].s_partition_num == le16_to_cpu(p->partitionNumber))
 929                 {
 930                         UDF_SB_PARTLEN(sb,i) = le32_to_cpu(p->partitionLength); /* blocks */
 931                         UDF_SB_PARTROOT(sb,i) = le32_to_cpu(p->partitionStartingLocation);
 932                         if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_READ_ONLY)
 933                                 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_READ_ONLY;
 934                         if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_WRITE_ONCE)
 935                                 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_WRITE_ONCE;
 936                         if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_REWRITABLE)
 937                                 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_REWRITABLE;
 938                         if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_OVERWRITABLE)
 939                                 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_OVERWRITABLE;
 940
 941                         if (!strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) ||
 942                                 !strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
 943                         {
 944                                 struct partitionHeaderDesc *phd;
 945
 946                                 phd = (struct partitionHeaderDesc *)(p->partitionContentsUse);
 947                                 if (phd->unallocSpaceTable.extLength)
 948                                 {
 949                                         kernel_lb_addr loc = { le32_to_cpu(phd->unallocSpaceTable.extPosition), i };
 950
 951                                         UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table =
 952                                                 udf_iget(sb, loc);
 953                                         UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_UNALLOC_TABLE;
 954                                         udf_debug("unallocSpaceTable (part %d) @ %ld\n",
 955                                                 i, UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table->i_ino);
 956                                 }
 957                                 if (phd->unallocSpaceBitmap.extLength)
 958                                 {
 959                                         UDF_SB_ALLOC_BITMAP(sb, i, s_uspace);
 960                                         if (UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap != NULL)
 961                                         {
 962                                                 UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extLength =
 963                                                         le32_to_cpu(phd->unallocSpaceBitmap.extLength);
 964                                                 UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extPosition =
 965                                                         le32_to_cpu(phd->unallocSpaceBitmap.extPosition);
 966                                                 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_UNALLOC_BITMAP;
 967                                                 udf_debug("unallocSpaceBitmap (part %d) @ %d\n",
 968                                                         i, UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extPosition);
 969                                         }
 970                                 }
 971                                 if (phd->partitionIntegrityTable.extLength)
 972                                         udf_debug("partitionIntegrityTable (part %d)\n", i);
 973                                 if (phd->freedSpaceTable.extLength)
 974                                 {
 975                                         kernel_lb_addr loc = { le32_to_cpu(phd->freedSpaceTable.extPosition), i };
 976
 977                                         UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table =
 978                                                 udf_iget(sb, loc);
 979                                         UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_FREED_TABLE;
 980                                         udf_debug("freedSpaceTable (part %d) @ %ld\n",
 981                                                 i, UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table->i_ino);
 982                                 }
 983                                 if (phd->freedSpaceBitmap.extLength)
 984                                 {
 985                                         UDF_SB_ALLOC_BITMAP(sb, i, s_fspace);
 986                                         if (UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap != NULL)
 987                                         {
 988                                                 UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extLength =
 989                                                         le32_to_cpu(phd->freedSpaceBitmap.extLength);
 990                                                 UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extPosition =
 991                                                         le32_to_cpu(phd->freedSpaceBitmap.extPosition);
 992                                                 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_FREED_BITMAP;
 993                                                 udf_debug("freedSpaceBitmap (part %d) @ %d\n",
 994                                                         i, UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extPosition);
 995                                         }
 996                                 }
 997                         }
 998                         break;
 999                 }
1000         }
1001         if (i == UDF_SB_NUMPARTS(sb))
1002         {
1003                 udf_debug("Partition (%d) not found in partition map\n", le16_to_cpu(p->partitionNumber));
1004         }
1005         else
1006         {
1007                 udf_debug("Partition (%d:%d type %x) starts at physical %d, block length %d\n",
1008                         le16_to_cpu(p->partitionNumber), i, UDF_SB_PARTTYPE(sb,i),
1009                         UDF_SB_PARTROOT(sb,i), UDF_SB_PARTLEN(sb,i));
1010         }
1011 }
1012
1013 static int
1014 udf_load_logicalvol(struct super_block *sb, struct buffer_head * bh, kernel_lb_addr *fileset)
1015 {
1016         struct logicalVolDesc *lvd;
1017         int i, j, offset;
1018         uint8_t type;
1019
1020         lvd = (struct logicalVolDesc *)bh->b_data;
1021
1022         UDF_SB_ALLOC_PARTMAPS(sb, le32_to_cpu(lvd->numPartitionMaps));
1023
1024         for (i=0,offset=0;
1025                  i<UDF_SB_NUMPARTS(sb) && offset<le32_to_cpu(lvd->mapTableLength);
1026                  i++,offset+=((struct genericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapLength)
1027         {
1028                 type = ((struct genericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapType;
1029                 if (type == 1)
1030                 {
1031                         struct genericPartitionMap1 *gpm1 = (struct genericPartitionMap1 *)&(lvd->partitionMaps[offset]);
1032                         UDF_SB_PARTTYPE(sb,i) = UDF_TYPE1_MAP15;
1033                         UDF_SB_PARTVSN(sb,i) = le16_to_cpu(gpm1->volSeqNum);
1034                         UDF_SB_PARTNUM(sb,i) = le16_to_cpu(gpm1->partitionNum);
1035                         UDF_SB_PARTFUNC(sb,i) = NULL;
1036                 }
1037                 else if (type == 2)
1038                 {
1039                         struct udfPartitionMap2 *upm2 = (struct udfPartitionMap2 *)&(lvd->partitionMaps[offset]);
1040                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL, strlen(UDF_ID_VIRTUAL)))
1041                         {
1042                                 if (le16_to_cpu(((__le16 *)upm2->partIdent.identSuffix)[0]) == 0x0150)
1043                                 {
1044                                         UDF_SB_PARTTYPE(sb,i) = UDF_VIRTUAL_MAP15;
1045                                         UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_virt15;
1046                                 }
1047                                 else if (le16_to_cpu(((__le16 *)upm2->partIdent.identSuffix)[0]) == 0x0200)
1048                                 {
1049                                         UDF_SB_PARTTYPE(sb,i) = UDF_VIRTUAL_MAP20;
1050                                         UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_virt20;
1051                                 }
1052                         }
1053                         else if (!strncmp(upm2->partIdent.ident, UDF_ID_SPARABLE, strlen(UDF_ID_SPARABLE)))
1054                         {
1055                                 uint32_t loc;
1056                                 uint16_t ident;
1057                                 struct sparingTable *st;
1058                                 struct sparablePartitionMap *spm = (struct sparablePartitionMap *)&(lvd->partitionMaps[offset]);
1059
1060                                 UDF_SB_PARTTYPE(sb,i) = UDF_SPARABLE_MAP15;
1061                                 UDF_SB_TYPESPAR(sb,i).s_packet_len = le16_to_cpu(spm->packetLength);
1062                                 for (j=0; j<spm->numSparingTables; j++)
1063                                 {
1064                                         loc = le32_to_cpu(spm->locSparingTable[j]);
1065                                         UDF_SB_TYPESPAR(sb,i).s_spar_map[j] =
1066                                                 udf_read_tagged(sb, loc, loc, &ident);
1067                                         if (UDF_SB_TYPESPAR(sb,i).s_spar_map[j] != NULL)
1068                                         {
1069                                                 st = (struct sparingTable *)UDF_SB_TYPESPAR(sb,i).s_spar_map[j]->b_data;
1070                                                 if (ident != 0 ||
1071                                                         strncmp(st->sparingIdent.ident, UDF_ID_SPARING, strlen(UDF_ID_SPARING)))
1072                                                 {
1073                                                         udf_release_data(UDF_SB_TYPESPAR(sb,i).s_spar_map[j]);
1074                                                         UDF_SB_TYPESPAR(sb,i).s_spar_map[j] = NULL;
1075                                                 }
1076                                         }
1077                                 }
1078                                 UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_spar15;
1079                         }
1080                         else
1081                         {
1082                                 udf_debug("Unknown ident: %s\n", upm2->partIdent.ident);
1083                                 continue;
1084                         }
1085                         UDF_SB_PARTVSN(sb,i) = le16_to_cpu(upm2->volSeqNum);
1086                         UDF_SB_PARTNUM(sb,i) = le16_to_cpu(upm2->partitionNum);
1087                 }
1088                 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1089                         i, UDF_SB_PARTNUM(sb,i), type, UDF_SB_PARTVSN(sb,i));
1090         }
1091
1092         if (fileset)
1093         {
1094                 long_ad *la = (long_ad *)&(lvd->logicalVolContentsUse[0]);
1095
1096                 *fileset = lelb_to_cpu(la->extLocation);
1097                 udf_debug("FileSet found in LogicalVolDesc at block=%d, partition=%d\n",
1098                         fileset->logicalBlockNum,
1099                         fileset->partitionReferenceNum);
1100         }
1101         if (lvd->integritySeqExt.extLength)
1102                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1103         return 0;
1104 }
1105
1106 /*
1107  * udf_load_logicalvolint
1108  *
1109  */
1110 static void
1111 udf_load_logicalvolint(struct super_block *sb, kernel_extent_ad loc)
1112 {
1113         struct buffer_head *bh = NULL;
1114         uint16_t ident;
1115
1116         while (loc.extLength > 0 &&
1117                 (bh = udf_read_tagged(sb, loc.extLocation,
1118                         loc.extLocation, &ident)) &&
1119                 ident == TAG_IDENT_LVID)
1120         {
1121                 UDF_SB_LVIDBH(sb) = bh;
1122
1123                 if (UDF_SB_LVID(sb)->nextIntegrityExt.extLength)
1124                         udf_load_logicalvolint(sb, leea_to_cpu(UDF_SB_LVID(sb)->nextIntegrityExt));
1125
1126                 if (UDF_SB_LVIDBH(sb) != bh)
1127                         udf_release_data(bh);
1128                 loc.extLength -= sb->s_blocksize;
1129                 loc.extLocation ++;
1130         }
1131         if (UDF_SB_LVIDBH(sb) != bh)
1132                 udf_release_data(bh);
1133 }
1134
1135 /*
1136  * udf_process_sequence
1137  *
1138  * PURPOSE
1139  *      Process a main/reserve volume descriptor sequence.
1140  *
1141  * PRE-CONDITIONS
1142  *      sb                      Pointer to _locked_ superblock.
1143  *      block                   First block of first extent of the sequence.
1144  *      lastblock               Lastblock of first extent of the sequence.
1145  *
1146  * HISTORY
1147  *      July 1, 1997 - Andrew E. Mileski
1148  *      Written, tested, and released.
1149  */
1150 static  int
1151 udf_process_sequence(struct super_block *sb, long block, long lastblock, kernel_lb_addr *fileset)
1152 {
1153         struct buffer_head *bh = NULL;
1154         struct udf_vds_record vds[VDS_POS_LENGTH];
1155         struct generic_desc *gd;
1156         struct volDescPtr *vdp;
1157         int done=0;
1158         int i,j;
1159         uint32_t vdsn;
1160         uint16_t ident;
1161         long next_s = 0, next_e = 0;
1162
1163         memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1164
1165         /* Read the main descriptor sequence */
1166         for (;(!done && block <= lastblock); block++)
1167         {
1168
1169                 bh = udf_read_tagged(sb, block, block, &ident);
1170                 if (!bh)
1171                         break;
1172
1173                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1174                 gd = (struct generic_desc *)bh->b_data;
1175                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1176                 switch (ident)
1177                 {
1178                         case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1179                                 if (vdsn >= vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum)
1180                                 {
1181                                         vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum = vdsn;
1182                                         vds[VDS_POS_PRIMARY_VOL_DESC].block = block;
1183                                 }
1184                                 break;
1185                         case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1186                                 if (vdsn >= vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum)
1187                                 {
1188                                         vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum = vdsn;
1189                                         vds[VDS_POS_VOL_DESC_PTR].block = block;
1190
1191                                         vdp = (struct volDescPtr *)bh->b_data;
1192                                         next_s = le32_to_cpu(vdp->nextVolDescSeqExt.extLocation);
1193                                         next_e = le32_to_cpu(vdp->nextVolDescSeqExt.extLength);
1194                                         next_e = next_e >> sb->s_blocksize_bits;
1195                                         next_e += next_s;
1196                                 }
1197                                 break;
1198                         case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1199                                 if (vdsn >= vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum)
1200                                 {
1201                                         vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum = vdsn;
1202                                         vds[VDS_POS_IMP_USE_VOL_DESC].block = block;
1203                                 }
1204                                 break;
1205                         case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1206                                 if (!vds[VDS_POS_PARTITION_DESC].block)
1207                                         vds[VDS_POS_PARTITION_DESC].block = block;
1208                                 break;
1209                         case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1210                                 if (vdsn >= vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum)
1211                                 {
1212                                         vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum = vdsn;
1213                                         vds[VDS_POS_LOGICAL_VOL_DESC].block = block;
1214                                 }
1215                                 break;
1216                         case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1217                                 if (vdsn >= vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum)
1218                                 {
1219                                         vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum = vdsn;
1220                                         vds[VDS_POS_UNALLOC_SPACE_DESC].block = block;
1221                                 }
1222                                 break;
1223                         case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1224                                 vds[VDS_POS_TERMINATING_DESC].block = block;
1225                                 if (next_e)
1226                                 {
1227                                         block = next_s;
1228                                         lastblock = next_e;
1229                                         next_s = next_e = 0;
1230                                 }
1231                                 else
1232                                         done = 1;
1233                                 break;
1234                 }
1235                 udf_release_data(bh);
1236         }
1237         for (i=0; i<VDS_POS_LENGTH; i++)
1238         {
1239                 if (vds[i].block)
1240                 {
1241                         bh = udf_read_tagged(sb, vds[i].block, vds[i].block, &ident);
1242
1243                         if (i == VDS_POS_PRIMARY_VOL_DESC)
1244                                 udf_load_pvoldesc(sb, bh);
1245                         else if (i == VDS_POS_LOGICAL_VOL_DESC)
1246                                 udf_load_logicalvol(sb, bh, fileset);
1247                         else if (i == VDS_POS_PARTITION_DESC)
1248                         {
1249                                 struct buffer_head *bh2 = NULL;
1250                                 udf_load_partdesc(sb, bh);
1251                                 for (j=vds[i].block+1; j<vds[VDS_POS_TERMINATING_DESC].block; j++)
1252                                 {
1253                                         bh2 = udf_read_tagged(sb, j, j, &ident);
1254                                         gd = (struct generic_desc *)bh2->b_data;
1255                                         if (ident == TAG_IDENT_PD)
1256                                                 udf_load_partdesc(sb, bh2);
1257                                         udf_release_data(bh2);
1258                                 }
1259                         }
1260                         udf_release_data(bh);
1261                 }
1262         }
1263
1264         return 0;
1265 }
1266
1267 /*
1268  * udf_check_valid()
1269  */
1270 static int
1271 udf_check_valid(struct super_block *sb, int novrs, int silent)
1272 {
1273         long block;
1274
1275         if (novrs)
1276         {
1277                 udf_debug("Validity check skipped because of novrs option\n");
1278                 return 0;
1279         }
1280         /* Check that it is NSR02 compliant */
1281         /* Process any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
1282         else if ((block = udf_vrs(sb, silent)) == -1)
1283         {
1284                 udf_debug("Failed to read byte 32768. Assuming open disc. Skipping validity check\n");
1285                 if (!UDF_SB_LASTBLOCK(sb))
1286                         UDF_SB_LASTBLOCK(sb) = udf_get_last_block(sb);
1287                 return 0;
1288         }
1289         else
1290                 return !block;
1291 }
1292
1293 static int
1294 udf_load_partition(struct super_block *sb, kernel_lb_addr *fileset)
1295 {
1296         struct anchorVolDescPtr *anchor;
1297         uint16_t ident;
1298         struct buffer_head *bh;
1299         long main_s, main_e, reserve_s, reserve_e;
1300         int i, j;
1301
1302         if (!sb)
1303                 return 1;
1304
1305         for (i=0; i<sizeof(UDF_SB_ANCHOR(sb))/sizeof(int); i++)
1306         {
1307                 if (UDF_SB_ANCHOR(sb)[i] && (bh = udf_read_tagged(sb,
1308                         UDF_SB_ANCHOR(sb)[i], UDF_SB_ANCHOR(sb)[i], &ident)))
1309                 {
1310                         anchor = (struct anchorVolDescPtr *)bh->b_data;
1311
1312                         /* Locate the main sequence */
1313                         main_s = le32_to_cpu( anchor->mainVolDescSeqExt.extLocation );
1314                         main_e = le32_to_cpu( anchor->mainVolDescSeqExt.extLength );
1315                         main_e = main_e >> sb->s_blocksize_bits;
1316                         main_e += main_s;
1317
1318                         /* Locate the reserve sequence */
1319                         reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1320                         reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1321                         reserve_e = reserve_e >> sb->s_blocksize_bits;
1322                         reserve_e += reserve_s;
1323
1324                         udf_release_data(bh);
1325
1326                         /* Process the main & reserve sequences */
1327                         /* responsible for finding the PartitionDesc(s) */
1328                         if (!(udf_process_sequence(sb, main_s, main_e, fileset) &&
1329                                 udf_process_sequence(sb, reserve_s, reserve_e, fileset)))
1330                         {
1331                                 break;
1332                         }
1333                 }
1334         }
1335
1336         if (i == sizeof(UDF_SB_ANCHOR(sb))/sizeof(int))
1337         {
1338                 udf_debug("No Anchor block found\n");
1339                 return 1;
1340         }
1341         else
1342                 udf_debug("Using anchor in block %d\n", UDF_SB_ANCHOR(sb)[i]);
1343
1344         for (i=0; i<UDF_SB_NUMPARTS(sb); i++)
1345         {
1346                 switch UDF_SB_PARTTYPE(sb, i)
1347                 {
1348                         case UDF_VIRTUAL_MAP15:
1349                         case UDF_VIRTUAL_MAP20:
1350                         {
1351                                 kernel_lb_addr ino;
1352
1353                                 if (!UDF_SB_LASTBLOCK(sb))
1354                                 {
1355                                         UDF_SB_LASTBLOCK(sb) = udf_get_last_block(sb);
1356                                         udf_find_anchor(sb);
1357                                 }
1358
1359                                 if (!UDF_SB_LASTBLOCK(sb))
1360                                 {
1361                                         udf_debug("Unable to determine Lastblock (For Virtual Partition)\n");
1362                                         return 1;
1363                                 }
1364
1365                                 for (j=0; j<UDF_SB_NUMPARTS(sb); j++)
1366                                 {
1367                                         if (j != i &&
1368                                                 UDF_SB_PARTVSN(sb,i) == UDF_SB_PARTVSN(sb,j) &&
1369                                                 UDF_SB_PARTNUM(sb,i) == UDF_SB_PARTNUM(sb,j))
1370                                         {
1371                                                 ino.partitionReferenceNum = j;
1372                                                 ino.logicalBlockNum = UDF_SB_LASTBLOCK(sb) -
1373                                                         UDF_SB_PARTROOT(sb,j);
1374                                                 break;
1375                                         }
1376                                 }
1377
1378                                 if (j == UDF_SB_NUMPARTS(sb))
1379                                         return 1;
1380
1381                                 if (!(UDF_SB_VAT(sb) = udf_iget(sb, ino)))
1382                                         return 1;
1383
1384                                 if (UDF_SB_PARTTYPE(sb,i) == UDF_VIRTUAL_MAP15)
1385                                 {
1386                                         UDF_SB_TYPEVIRT(sb,i).s_start_offset = udf_ext0_offset(UDF_SB_VAT(sb));
1387                                         UDF_SB_TYPEVIRT(sb,i).s_num_entries = (UDF_SB_VAT(sb)->i_size - 36) >> 2;
1388                                 }
1389                                 else if (UDF_SB_PARTTYPE(sb,i) == UDF_VIRTUAL_MAP20)
1390                                 {
1391                                         struct buffer_head *bh = NULL;
1392                                         uint32_t pos;
1393
1394                                         pos = udf_block_map(UDF_SB_VAT(sb), 0);
1395                                         bh = sb_bread(sb, pos);
1396                                         UDF_SB_TYPEVIRT(sb,i).s_start_offset =
1397                                                 le16_to_cpu(((struct virtualAllocationTable20 *)bh->b_data + udf_ext0_offset(UDF_SB_VAT(sb)))->lengthHeader) +
1398                                                         udf_ext0_offset(UDF_SB_VAT(sb));
1399                                         UDF_SB_TYPEVIRT(sb,i).s_num_entries = (UDF_SB_VAT(sb)->i_size -
1400                                                 UDF_SB_TYPEVIRT(sb,i).s_start_offset) >> 2;
1401                                         udf_release_data(bh);
1402                                 }
1403                                 UDF_SB_PARTROOT(sb,i) = udf_get_pblock(sb, 0, i, 0);
1404                                 UDF_SB_PARTLEN(sb,i) = UDF_SB_PARTLEN(sb,ino.partitionReferenceNum);
1405                         }
1406                 }
1407         }
1408         return 0;
1409 }
1410
1411 static void udf_open_lvid(struct super_block *sb)
1412 {
1413         if (UDF_SB_LVIDBH(sb))
1414         {
1415                 int i;
1416                 kernel_timestamp cpu_time;
1417
1418                 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1419                 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1420                 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
1421                         UDF_SB_LVID(sb)->recordingDateAndTime = cpu_to_lets(cpu_time);
1422                 UDF_SB_LVID(sb)->integrityType = LVID_INTEGRITY_TYPE_OPEN;
1423
1424                 UDF_SB_LVID(sb)->descTag.descCRC =
1425                         cpu_to_le16(udf_crc((char *)UDF_SB_LVID(sb) + sizeof(tag),
1426                         le16_to_cpu(UDF_SB_LVID(sb)->descTag.descCRCLength), 0));
1427
1428                 UDF_SB_LVID(sb)->descTag.tagChecksum = 0;
1429                 for (i=0; i<16; i++)
1430                         if (i != 4)
1431                                 UDF_SB_LVID(sb)->descTag.tagChecksum +=
1432                                         ((uint8_t *)&(UDF_SB_LVID(sb)->descTag))[i];
1433
1434                 mark_buffer_dirty(UDF_SB_LVIDBH(sb));
1435         }
1436 }
1437
1438 static void udf_close_lvid(struct super_block *sb)
1439 {
1440         if (UDF_SB_LVIDBH(sb) &&
1441                 UDF_SB_LVID(sb)->integrityType == LVID_INTEGRITY_TYPE_OPEN)
1442         {
1443                 int i;
1444                 kernel_timestamp cpu_time;
1445
1446                 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1447                 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1448                 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
1449                         UDF_SB_LVID(sb)->recordingDateAndTime = cpu_to_lets(cpu_time);
1450                 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(UDF_SB_LVIDIU(sb)->maxUDFWriteRev))
1451                         UDF_SB_LVIDIU(sb)->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1452                 if (UDF_SB_UDFREV(sb) > le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev))
1453                         UDF_SB_LVIDIU(sb)->minUDFReadRev = cpu_to_le16(UDF_SB_UDFREV(sb));
1454                 if (UDF_SB_UDFREV(sb) > le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev))
1455                         UDF_SB_LVIDIU(sb)->minUDFWriteRev = cpu_to_le16(UDF_SB_UDFREV(sb));
1456                 UDF_SB_LVID(sb)->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1457
1458                 UDF_SB_LVID(sb)->descTag.descCRC =
1459                         cpu_to_le16(udf_crc((char *)UDF_SB_LVID(sb) + sizeof(tag),
1460                         le16_to_cpu(UDF_SB_LVID(sb)->descTag.descCRCLength), 0));
1461
1462                 UDF_SB_LVID(sb)->descTag.tagChecksum = 0;
1463                 for (i=0; i<16; i++)
1464                         if (i != 4)
1465                                 UDF_SB_LVID(sb)->descTag.tagChecksum +=
1466                                         ((uint8_t *)&(UDF_SB_LVID(sb)->descTag))[i];
1467
1468                 mark_buffer_dirty(UDF_SB_LVIDBH(sb));
1469         }
1470 }
1471
1472 /*
1473  * udf_read_super
1474  *
1475  * PURPOSE
1476  *      Complete the specified super block.
1477  *
1478  * PRE-CONDITIONS
1479  *      sb                      Pointer to superblock to complete - never NULL.
1480  *      sb->s_dev               Device to read suberblock from.
1481  *      options                 Pointer to mount options.
1482  *      silent                  Silent flag.
1483  *
1484  * HISTORY
1485  *      July 1, 1997 - Andrew E. Mileski
1486  *      Written, tested, and released.
1487  */
1488 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1489 {
1490         int i;
1491         struct inode *inode=NULL;
1492         struct udf_options uopt;
1493         kernel_lb_addr rootdir, fileset;
1494         struct udf_sb_info *sbi;
1495
1496         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1497         uopt.uid = -1;
1498         uopt.gid = -1;
1499         uopt.umask = 0;
1500
1501         sbi = kmalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1502         if (!sbi)
1503                 return -ENOMEM;
1504         sb->s_fs_info = sbi;
1505         memset(UDF_SB(sb), 0x00, sizeof(struct udf_sb_info));
1506
1507         init_MUTEX(&sbi->s_alloc_sem);
1508
1509         if (!udf_parse_options((char *)options, &uopt))
1510                 goto error_out;
1511
1512         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1513             uopt.flags & (1 << UDF_FLAG_NLS_MAP))
1514         {
1515                 udf_error(sb, "udf_read_super",
1516                         "utf8 cannot be combined with iocharset\n");
1517                 goto error_out;
1518         }
1519 #ifdef CONFIG_UDF_NLS
1520         if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map)
1521         {
1522                 uopt.nls_map = load_nls_default();
1523                 if (!uopt.nls_map)
1524                         uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1525                 else
1526                         udf_debug("Using default NLS map\n");
1527         }
1528 #endif
1529         if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1530                 uopt.flags |= (1 << UDF_FLAG_UTF8);
1531
1532         fileset.logicalBlockNum = 0xFFFFFFFF;
1533         fileset.partitionReferenceNum = 0xFFFF;
1534
1535         UDF_SB(sb)->s_flags = uopt.flags;
1536         UDF_SB(sb)->s_uid = uopt.uid;
1537         UDF_SB(sb)->s_gid = uopt.gid;
1538         UDF_SB(sb)->s_umask = uopt.umask;
1539         UDF_SB(sb)->s_nls_map = uopt.nls_map;
1540
1541         /* Set the block size for all transfers */
1542         if (!udf_set_blocksize(sb, uopt.blocksize))
1543                 goto error_out;
1544
1545         if ( uopt.session == 0xFFFFFFFF )
1546                 UDF_SB_SESSION(sb) = udf_get_last_session(sb);
1547         else
1548                 UDF_SB_SESSION(sb) = uopt.session;
1549
1550         udf_debug("Multi-session=%d\n", UDF_SB_SESSION(sb));
1551
1552         UDF_SB_LASTBLOCK(sb) = uopt.lastblock;
1553         UDF_SB_ANCHOR(sb)[0] = UDF_SB_ANCHOR(sb)[1] = 0;
1554         UDF_SB_ANCHOR(sb)[2] = uopt.anchor;
1555         UDF_SB_ANCHOR(sb)[3] = 256;
1556
1557         if (udf_check_valid(sb, uopt.novrs, silent)) /* read volume recognition sequences */
1558         {
1559                 printk("UDF-fs: No VRS found\n");
1560                 goto error_out;
1561         }
1562
1563         udf_find_anchor(sb);
1564
1565         /* Fill in the rest of the superblock */
1566         sb->s_op = &udf_sb_ops;
1567         sb->dq_op = NULL;
1568         sb->s_dirt = 0;
1569         sb->s_magic = UDF_SUPER_MAGIC;
1570         sb->s_time_gran = 1000;
1571
1572         if (udf_load_partition(sb, &fileset))
1573         {
1574                 printk("UDF-fs: No partition found (1)\n");
1575                 goto error_out;
1576         }
1577
1578         udf_debug("Lastblock=%d\n", UDF_SB_LASTBLOCK(sb));
1579
1580         if ( UDF_SB_LVIDBH(sb) )
1581         {
1582                 uint16_t minUDFReadRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev);
1583                 uint16_t minUDFWriteRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev);
1584                 /* uint16_t maxUDFWriteRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->maxUDFWriteRev); */
1585
1586                 if (minUDFReadRev > UDF_MAX_READ_VERSION)
1587                 {
1588                         printk("UDF-fs: minUDFReadRev=%x (max is %x)\n",
1589                                 le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev),
1590                                 UDF_MAX_READ_VERSION);
1591                         goto error_out;
1592                 }
1593                 else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
1594                 {
1595                         sb->s_flags |= MS_RDONLY;
1596                 }
1597
1598                 UDF_SB_UDFREV(sb) = minUDFWriteRev;
1599
1600                 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1601                         UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
1602                 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
1603                         UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
1604         }
1605
1606         if ( !UDF_SB_NUMPARTS(sb) )
1607         {
1608                 printk("UDF-fs: No partition found (2)\n");
1609                 goto error_out;
1610         }
1611
1612         if ( udf_find_fileset(sb, &fileset, &rootdir) )
1613         {
1614                 printk("UDF-fs: No fileset found\n");
1615                 goto error_out;
1616         }
1617
1618         if (!silent)
1619         {
1620                 kernel_timestamp ts;
1621                 udf_time_to_stamp(&ts, UDF_SB_RECORDTIME(sb));
1622                 udf_info("UDF %s (%s) Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
1623                         UDFFS_VERSION, UDFFS_DATE,
1624                         UDF_SB_VOLIDENT(sb), ts.year, ts.month, ts.day, ts.hour, ts.minute,
1625                         ts.typeAndTimezone);
1626         }
1627         if (!(sb->s_flags & MS_RDONLY))
1628                 udf_open_lvid(sb);
1629
1630         /* Assign the root inode */
1631         /* assign inodes by physical block number */
1632         /* perhaps it's not extensible enough, but for now ... */
1633         inode = udf_iget(sb, rootdir);
1634         if (!inode)
1635         {
1636                 printk("UDF-fs: Error in udf_iget, block=%d, partition=%d\n",
1637                         rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
1638                 goto error_out;
1639         }
1640
1641         /* Allocate a dentry for the root inode */
1642         sb->s_root = d_alloc_root(inode);
1643         if (!sb->s_root)
1644         {
1645                 printk("UDF-fs: Couldn't allocate root dentry\n");
1646                 iput(inode);
1647                 goto error_out;
1648         }
1649         sb->s_maxbytes = MAX_LFS_FILESIZE;
1650         return 0;
1651
1652 error_out:
1653         if (UDF_SB_VAT(sb))
1654                 iput(UDF_SB_VAT(sb));
1655         if (UDF_SB_NUMPARTS(sb))
1656         {
1657                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1658                         iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1659                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1660                         iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1661                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1662                         UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_uspace);
1663                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1664                         UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_fspace);
1665                 if (UDF_SB_PARTTYPE(sb, UDF_SB_PARTITION(sb)) == UDF_SPARABLE_MAP15)
1666                 {
1667                         for (i=0; i<4; i++)
1668                                 udf_release_data(UDF_SB_TYPESPAR(sb, UDF_SB_PARTITION(sb)).s_spar_map[i]);
1669                 }
1670         }
1671 #ifdef CONFIG_UDF_NLS
1672         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1673                 unload_nls(UDF_SB(sb)->s_nls_map);
1674 #endif
1675         if (!(sb->s_flags & MS_RDONLY))
1676                 udf_close_lvid(sb);
1677         udf_release_data(UDF_SB_LVIDBH(sb));
1678         UDF_SB_FREE(sb);
1679         kfree(sbi);
1680         sb->s_fs_info = NULL;
1681         return -EINVAL;
1682 }
1683
1684 void udf_error(struct super_block *sb, const char *function,
1685         const char *fmt, ...)
1686 {
1687         va_list args;
1688
1689         if (!(sb->s_flags & MS_RDONLY))
1690         {
1691                 /* mark sb error */
1692                 sb->s_dirt = 1;
1693         }
1694         va_start(args, fmt);
1695         vsprintf(error_buf, fmt, args);
1696         va_end(args);
1697         printk (KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
1698                 sb->s_id, function, error_buf);
1699 }
1700
1701 void udf_warning(struct super_block *sb, const char *function,
1702         const char *fmt, ...)
1703 {
1704         va_list args;
1705
1706         va_start (args, fmt);
1707         vsprintf(error_buf, fmt, args);
1708         va_end(args);
1709         printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
1710                 sb->s_id, function, error_buf);
1711 }
1712
1713 /*
1714  * udf_put_super
1715  *
1716  * PURPOSE
1717  *      Prepare for destruction of the superblock.
1718  *
1719  * DESCRIPTION
1720  *      Called before the filesystem is unmounted.
1721  *
1722  * HISTORY
1723  *      July 1, 1997 - Andrew E. Mileski
1724  *      Written, tested, and released.
1725  */
1726 static void
1727 udf_put_super(struct super_block *sb)
1728 {
1729         int i;
1730
1731         if (UDF_SB_VAT(sb))
1732                 iput(UDF_SB_VAT(sb));
1733         if (UDF_SB_NUMPARTS(sb))
1734         {
1735                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1736                         iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1737                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1738                         iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1739                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1740                         UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_uspace);
1741                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1742                         UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_fspace);
1743                 if (UDF_SB_PARTTYPE(sb, UDF_SB_PARTITION(sb)) == UDF_SPARABLE_MAP15)
1744                 {
1745                         for (i=0; i<4; i++)
1746                                 udf_release_data(UDF_SB_TYPESPAR(sb, UDF_SB_PARTITION(sb)).s_spar_map[i]);
1747                 }
1748         }
1749 #ifdef CONFIG_UDF_NLS
1750         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1751                 unload_nls(UDF_SB(sb)->s_nls_map);
1752 #endif
1753         if (!(sb->s_flags & MS_RDONLY))
1754                 udf_close_lvid(sb);
1755         udf_release_data(UDF_SB_LVIDBH(sb));
1756         UDF_SB_FREE(sb);
1757         kfree(sb->s_fs_info);
1758         sb->s_fs_info = NULL;
1759 }
1760
1761 /*
1762  * udf_stat_fs
1763  *
1764  * PURPOSE
1765  *      Return info about the filesystem.
1766  *
1767  * DESCRIPTION
1768  *      Called by sys_statfs()
1769  *
1770  * HISTORY
1771  *      July 1, 1997 - Andrew E. Mileski
1772  *      Written, tested, and released.
1773  */
1774 static int
1775 udf_statfs(struct super_block *sb, struct kstatfs *buf)
1776 {
1777         buf->f_type = UDF_SUPER_MAGIC;
1778         buf->f_bsize = sb->s_blocksize;
1779         buf->f_blocks = UDF_SB_PARTLEN(sb, UDF_SB_PARTITION(sb));
1780         buf->f_bfree = udf_count_free(sb);
1781         buf->f_bavail = buf->f_bfree;
1782         buf->f_files = (UDF_SB_LVIDBH(sb) ?
1783                 (le32_to_cpu(UDF_SB_LVIDIU(sb)->numFiles) +
1784                 le32_to_cpu(UDF_SB_LVIDIU(sb)->numDirs)) : 0) + buf->f_bfree;
1785         buf->f_ffree = buf->f_bfree;
1786         /* __kernel_fsid_t f_fsid */
1787         buf->f_namelen = UDF_NAME_LEN-2;
1788
1789         return 0;
1790 }
1791
1792 static unsigned char udf_bitmap_lookup[16] = {
1793         0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4
1794 };
1795
1796 static unsigned int
1797 udf_count_free_bitmap(struct super_block *sb, struct udf_bitmap *bitmap)
1798 {
1799         struct buffer_head *bh = NULL;
1800         unsigned int accum = 0;
1801         int index;
1802         int block = 0, newblock;
1803         kernel_lb_addr loc;
1804         uint32_t bytes;
1805         uint8_t value;
1806         uint8_t *ptr;
1807         uint16_t ident;
1808         struct spaceBitmapDesc *bm;
1809
1810         lock_kernel();
1811
1812         loc.logicalBlockNum = bitmap->s_extPosition;
1813         loc.partitionReferenceNum = UDF_SB_PARTITION(sb);
1814         bh = udf_read_ptagged(sb, loc, 0, &ident);
1815
1816         if (!bh)
1817         {
1818                 printk(KERN_ERR "udf: udf_count_free failed\n");
1819                 goto out;
1820         }
1821         else if (ident != TAG_IDENT_SBD)
1822         {
1823                 udf_release_data(bh);
1824                 printk(KERN_ERR "udf: udf_count_free failed\n");
1825                 goto out;
1826         }
1827
1828         bm = (struct spaceBitmapDesc *)bh->b_data;
1829         bytes = le32_to_cpu(bm->numOfBytes);
1830         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
1831         ptr = (uint8_t *)bh->b_data;
1832
1833         while ( bytes > 0 )
1834         {
1835                 while ((bytes > 0) && (index < sb->s_blocksize))
1836                 {
1837                         value = ptr[index];
1838                         accum += udf_bitmap_lookup[ value & 0x0f ];
1839                         accum += udf_bitmap_lookup[ value >> 4 ];
1840                         index++;
1841                         bytes--;
1842                 }
1843                 if ( bytes )
1844                 {
1845                         udf_release_data(bh);
1846                         newblock = udf_get_lb_pblock(sb, loc, ++block);
1847                         bh = udf_tread(sb, newblock);
1848                         if (!bh)
1849                         {
1850                                 udf_debug("read failed\n");
1851                                 goto out;
1852                         }
1853                         index = 0;
1854                         ptr = (uint8_t *)bh->b_data;
1855                 }
1856         }
1857         udf_release_data(bh);
1858
1859 out:
1860         unlock_kernel();
1861
1862         return accum;
1863 }
1864
1865 static unsigned int
1866 udf_count_free_table(struct super_block *sb, struct inode * table)
1867 {
1868         unsigned int accum = 0;
1869         uint32_t extoffset, elen;
1870         kernel_lb_addr bloc, eloc;
1871         int8_t etype;
1872         struct buffer_head *bh = NULL;
1873
1874         lock_kernel();
1875
1876         bloc = UDF_I_LOCATION(table);
1877         extoffset = sizeof(struct unallocSpaceEntry);
1878
1879         while ((etype = udf_next_aext(table, &bloc, &extoffset, &eloc, &elen, &bh, 1)) != -1)
1880         {
1881                 accum += (elen >> table->i_sb->s_blocksize_bits);
1882         }
1883         udf_release_data(bh);
1884
1885         unlock_kernel();
1886
1887         return accum;
1888 }
1889
1890 static unsigned int
1891 udf_count_free(struct super_block *sb)
1892 {
1893         unsigned int accum = 0;
1894
1895         if (UDF_SB_LVIDBH(sb))
1896         {
1897                 if (le32_to_cpu(UDF_SB_LVID(sb)->numOfPartitions) > UDF_SB_PARTITION(sb))
1898                 {
1899                         accum = le32_to_cpu(UDF_SB_LVID(sb)->freeSpaceTable[UDF_SB_PARTITION(sb)]);
1900
1901                         if (accum == 0xFFFFFFFF)
1902                                 accum = 0;
1903                 }
1904         }
1905
1906         if (accum)
1907                 return accum;
1908
1909         if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1910         {
1911                 accum += udf_count_free_bitmap(sb,
1912                         UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_bitmap);
1913         }
1914         if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1915         {
1916                 accum += udf_count_free_bitmap(sb,
1917                         UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_bitmap);
1918         }
1919         if (accum)
1920                 return accum;
1921
1922         if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1923         {
1924                 accum += udf_count_free_table(sb,
1925                         UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1926         }
1927         if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1928         {
1929                 accum += udf_count_free_table(sb,
1930                         UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1931         }
1932
1933         return accum;
1934 }