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   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  * COPYRIGHT
  18  *  This file is distributed under the terms of the GNU General Public
  19  *  License (GPL). Copies of the GPL can be obtained from:
  20  *    ftp://prep.ai.mit.edu/pub/gnu/GPL
  21  *  Each contributing author retains all rights to their own work.
  22  *
  23  *  (C) 1998 Dave Boynton
  24  *  (C) 1998-2004 Ben Fennema
  25  *  (C) 2000 Stelias Computing Inc
  26  *
  27  * HISTORY
  28  *
  29  *  09/24/98 dgb  changed to allow compiling outside of kernel, and
  30  *                added some debugging.
  31  *  10/01/98 dgb  updated to allow (some) possibility of compiling w/2.0.34
  32  *  10/16/98      attempting some multi-session support
  33  *  10/17/98      added freespace count for "df"
  34  *  11/11/98 gr   added novrs option
  35  *  11/26/98 dgb  added fileset,anchor mount options
  36  *  12/06/98 blf  really hosed things royally. vat/sparing support. sequenced vol descs
  37  *                rewrote option handling based on isofs
  38  *  12/20/98      find the free space bitmap (if it exists)
  39  */
  40
  41 #include "udfdecl.h"
  42
  43 #include <linux/blkdev.h>
  44 #include <linux/slab.h>
  45 #include <linux/kernel.h>
  46 #include <linux/module.h>
  47 #include <linux/parser.h>
  48 #include <linux/stat.h>
  49 #include <linux/cdrom.h>
  50 #include <linux/nls.h>
  51 #include <linux/smp_lock.h>
  52 #include <linux/buffer_head.h>
  53 #include <linux/vfs.h>
  54 #include <linux/vmalloc.h>
  55 #include <asm/byteorder.h>
  56
  57 #include <linux/udf_fs.h>
  58 #include "udf_sb.h"
  59 #include "udf_i.h"
  60
  61 #include <linux/init.h>
  62 #include <asm/uaccess.h>
  63
  64 #define VDS_POS_PRIMARY_VOL_DESC        0
  65 #define VDS_POS_UNALLOC_SPACE_DESC      1
  66 #define VDS_POS_LOGICAL_VOL_DESC        2
  67 #define VDS_POS_PARTITION_DESC          3
  68 #define VDS_POS_IMP_USE_VOL_DESC        4
  69 #define VDS_POS_VOL_DESC_PTR            5
  70 #define VDS_POS_TERMINATING_DESC        6
  71 #define VDS_POS_LENGTH                  7
  72
  73 static char error_buf[1024];
  74
  75 /* These are the "meat" - everything else is stuffing */
  76 static int udf_fill_super(struct super_block *, void *, int);
  77 static void udf_put_super(struct super_block *);
  78 static void udf_write_super(struct super_block *);
  79 static int udf_remount_fs(struct super_block *, int *, char *);
  80 static int udf_check_valid(struct super_block *, int, int);
  81 static int udf_vrs(struct super_block *sb, int silent);
  82 static int udf_load_partition(struct super_block *, kernel_lb_addr *);
  83 static int udf_load_logicalvol(struct super_block *, struct buffer_head *,
  84                                kernel_lb_addr *);
  85 static void udf_load_logicalvolint(struct super_block *, kernel_extent_ad);
  86 static void udf_find_anchor(struct super_block *);
  87 static int udf_find_fileset(struct super_block *, kernel_lb_addr *,
  88                             kernel_lb_addr *);
  89 static void udf_load_pvoldesc(struct super_block *, struct buffer_head *);
  90 static void udf_load_fileset(struct super_block *, struct buffer_head *,
  91                              kernel_lb_addr *);
  92 static int udf_load_partdesc(struct super_block *, struct buffer_head *);
  93 static void udf_open_lvid(struct super_block *);
  94 static void udf_close_lvid(struct super_block *);
  95 static unsigned int udf_count_free(struct super_block *);
  96 static int udf_statfs(struct dentry *, struct kstatfs *);
  97
  98 /* UDF filesystem type */
  99 static int udf_get_sb(struct file_system_type *fs_type,
 100                       int flags, const char *dev_name, void *data,
 101                       struct vfsmount *mnt)
 102 {
 103         return get_sb_bdev(fs_type, flags, dev_name, data, udf_fill_super, mnt);
 104 }
 105
 106 static struct file_system_type udf_fstype = {
 107         .owner          = THIS_MODULE,
 108         .name           = "udf",
 109         .get_sb         = udf_get_sb,
 110         .kill_sb        = kill_block_super,
 111         .fs_flags       = FS_REQUIRES_DEV,
 112 };
 113
 114 static struct kmem_cache *udf_inode_cachep;
 115
 116 static struct inode *udf_alloc_inode(struct super_block *sb)
 117 {
 118         struct udf_inode_info *ei;
 119         ei = (struct udf_inode_info *)kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
 120         if (!ei)
 121                 return NULL;
 122
 123         ei->i_unique = 0;
 124         ei->i_lenExtents = 0;
 125         ei->i_next_alloc_block = 0;
 126         ei->i_next_alloc_goal = 0;
 127         ei->i_strat4096 = 0;
 128
 129         return &ei->vfs_inode;
 130 }
 131
 132 static void udf_destroy_inode(struct inode *inode)
 133 {
 134         kmem_cache_free(udf_inode_cachep, UDF_I(inode));
 135 }
 136
 137 static void init_once(struct kmem_cache *cachep, void *foo)
 138 {
 139         struct udf_inode_info *ei = (struct udf_inode_info *)foo;
 140
 141         ei->i_ext.i_data = NULL;
 142         inode_init_once(&ei->vfs_inode);
 143 }
 144
 145 static int init_inodecache(void)
 146 {
 147         udf_inode_cachep = kmem_cache_create("udf_inode_cache",
 148                                              sizeof(struct udf_inode_info),
 149                                              0, (SLAB_RECLAIM_ACCOUNT |
 150                                                  SLAB_MEM_SPREAD),
 151                                              init_once);
 152         if (!udf_inode_cachep)
 153                 return -ENOMEM;
 154         return 0;
 155 }
 156
 157 static void destroy_inodecache(void)
 158 {
 159         kmem_cache_destroy(udf_inode_cachep);
 160 }
 161
 162 /* Superblock operations */
 163 static const struct super_operations udf_sb_ops = {
 164         .alloc_inode    = udf_alloc_inode,
 165         .destroy_inode  = udf_destroy_inode,
 166         .write_inode    = udf_write_inode,
 167         .delete_inode   = udf_delete_inode,
 168         .clear_inode    = udf_clear_inode,
 169         .put_super      = udf_put_super,
 170         .write_super    = udf_write_super,
 171         .statfs         = udf_statfs,
 172         .remount_fs     = udf_remount_fs,
 173 };
 174
 175 struct udf_options {
 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
 196         err = init_inodecache();
 197         if (err)
 198                 goto out1;
 199         err = register_filesystem(&udf_fstype);
 200         if (err)
 201                 goto out;
 202
 203         return 0;
 204
 205 out:
 206         destroy_inodecache();
 207
 208 out1:
 209         return err;
 210 }
 211
 212 static void __exit exit_udf_fs(void)
 213 {
 214         unregister_filesystem(&udf_fstype);
 215         destroy_inodecache();
 216 }
 217
 218 module_init(init_udf_fs)
 219 module_exit(exit_udf_fs)
 220
 221 /*
 222  * udf_parse_options
 223  *
 224  * PURPOSE
 225  *      Parse mount options.
 226  *
 227  * DESCRIPTION
 228  *      The following mount options are supported:
 229  *
 230  *      gid=            Set the default group.
 231  *      umask=          Set the default umask.
 232  *      uid=            Set the default user.
 233  *      bs=             Set the block size.
 234  *      unhide          Show otherwise hidden files.
 235  *      undelete        Show deleted files in lists.
 236  *      adinicb         Embed data in the inode (default)
 237  *      noadinicb       Don't embed data in the inode
 238  *      shortad         Use short ad's
 239  *      longad          Use long ad's (default)
 240  *      nostrict        Unset strict conformance
 241  *      iocharset=      Set the NLS character set
 242  *
 243  *      The remaining are for debugging and disaster recovery:
 244  *
 245  *      novrs           Skip volume sequence recognition
 246  *
 247  *      The following expect a offset from 0.
 248  *
 249  *      session=        Set the CDROM session (default= last session)
 250  *      anchor=         Override standard anchor location. (default= 256)
 251  *      volume=         Override the VolumeDesc location. (unused)
 252  *      partition=      Override the PartitionDesc location. (unused)
 253  *      lastblock=      Set the last block of the filesystem/
 254  *
 255  *      The following expect a offset from the partition root.
 256  *
 257  *      fileset=        Override the fileset block location. (unused)
 258  *      rootdir=        Override the root directory location. (unused)
 259  *              WARNING: overriding the rootdir to a non-directory may
 260  *              yield highly unpredictable results.
 261  *
 262  * PRE-CONDITIONS
 263  *      options         Pointer to mount options string.
 264  *      uopts           Pointer to mount options variable.
 265  *
 266  * POST-CONDITIONS
 267  *      <return>        1       Mount options parsed okay.
 268  *      <return>        0       Error parsing mount options.
 269  *
 270  * HISTORY
 271  *      July 1, 1997 - Andrew E. Mileski
 272  *      Written, tested, and released.
 273  */
 274
 275 enum {
 276         Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
 277         Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
 278         Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
 279         Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
 280         Opt_rootdir, Opt_utf8, Opt_iocharset,
 281         Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore
 282 };
 283
 284 static match_table_t tokens = {
 285         {Opt_novrs,     "novrs"},
 286         {Opt_nostrict,  "nostrict"},
 287         {Opt_bs,        "bs=%u"},
 288         {Opt_unhide,    "unhide"},
 289         {Opt_undelete,  "undelete"},
 290         {Opt_noadinicb, "noadinicb"},
 291         {Opt_adinicb,   "adinicb"},
 292         {Opt_shortad,   "shortad"},
 293         {Opt_longad,    "longad"},
 294         {Opt_uforget,   "uid=forget"},
 295         {Opt_uignore,   "uid=ignore"},
 296         {Opt_gforget,   "gid=forget"},
 297         {Opt_gignore,   "gid=ignore"},
 298         {Opt_gid,       "gid=%u"},
 299         {Opt_uid,       "uid=%u"},
 300         {Opt_umask,     "umask=%o"},
 301         {Opt_session,   "session=%u"},
 302         {Opt_lastblock, "lastblock=%u"},
 303         {Opt_anchor,    "anchor=%u"},
 304         {Opt_volume,    "volume=%u"},
 305         {Opt_partition, "partition=%u"},
 306         {Opt_fileset,   "fileset=%u"},
 307         {Opt_rootdir,   "rootdir=%u"},
 308         {Opt_utf8,      "utf8"},
 309         {Opt_iocharset, "iocharset=%s"},
 310         {Opt_err,       NULL}
 311 };
 312
 313 static int udf_parse_options(char *options, struct udf_options *uopt)
 314 {
 315         char *p;
 316         int option;
 317
 318         uopt->novrs = 0;
 319         uopt->blocksize = 2048;
 320         uopt->partition = 0xFFFF;
 321         uopt->session = 0xFFFFFFFF;
 322         uopt->lastblock = 0;
 323         uopt->anchor = 0;
 324         uopt->volume = 0xFFFFFFFF;
 325         uopt->rootdir = 0xFFFFFFFF;
 326         uopt->fileset = 0xFFFFFFFF;
 327         uopt->nls_map = NULL;
 328
 329         if (!options)
 330                 return 1;
 331
 332         while ((p = strsep(&options, ",")) != NULL) {
 333                 substring_t args[MAX_OPT_ARGS];
 334                 int token;
 335                 if (!*p)
 336                         continue;
 337
 338                 token = match_token(p, tokens, args);
 339                 switch (token) {
 340                 case Opt_novrs:
 341                         uopt->novrs = 1;
 342                 case Opt_bs:
 343                         if (match_int(&args[0], &option))
 344                                 return 0;
 345                         uopt->blocksize = option;
 346                         break;
 347                 case Opt_unhide:
 348                         uopt->flags |= (1 << UDF_FLAG_UNHIDE);
 349                         break;
 350                 case Opt_undelete:
 351                         uopt->flags |= (1 << UDF_FLAG_UNDELETE);
 352                         break;
 353                 case Opt_noadinicb:
 354                         uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
 355                         break;
 356                 case Opt_adinicb:
 357                         uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
 358                         break;
 359                 case Opt_shortad:
 360                         uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
 361                         break;
 362                 case Opt_longad:
 363                         uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
 364                         break;
 365                 case Opt_gid:
 366                         if (match_int(args, &option))
 367                                 return 0;
 368                         uopt->gid = option;
 369                         uopt->flags |= (1 << UDF_FLAG_GID_SET);
 370                         break;
 371                 case Opt_uid:
 372                         if (match_int(args, &option))
 373                                 return 0;
 374                         uopt->uid = option;
 375                         uopt->flags |= (1 << UDF_FLAG_UID_SET);
 376                         break;
 377                 case Opt_umask:
 378                         if (match_octal(args, &option))
 379                                 return 0;
 380                         uopt->umask = option;
 381                         break;
 382                 case Opt_nostrict:
 383                         uopt->flags &= ~(1 << UDF_FLAG_STRICT);
 384                         break;
 385                 case Opt_session:
 386                         if (match_int(args, &option))
 387                                 return 0;
 388                         uopt->session = option;
 389                         break;
 390                 case Opt_lastblock:
 391                         if (match_int(args, &option))
 392                                 return 0;
 393                         uopt->lastblock = option;
 394                         break;
 395                 case Opt_anchor:
 396                         if (match_int(args, &option))
 397                                 return 0;
 398                         uopt->anchor = option;
 399                         break;
 400                 case Opt_volume:
 401                         if (match_int(args, &option))
 402                                 return 0;
 403                         uopt->volume = option;
 404                         break;
 405                 case Opt_partition:
 406                         if (match_int(args, &option))
 407                                 return 0;
 408                         uopt->partition = option;
 409                         break;
 410                 case Opt_fileset:
 411                         if (match_int(args, &option))
 412                                 return 0;
 413                         uopt->fileset = option;
 414                         break;
 415                 case Opt_rootdir:
 416                         if (match_int(args, &option))
 417                                 return 0;
 418                         uopt->rootdir = option;
 419                         break;
 420                 case Opt_utf8:
 421                         uopt->flags |= (1 << UDF_FLAG_UTF8);
 422                         break;
 423 #ifdef CONFIG_UDF_NLS
 424                 case Opt_iocharset:
 425                         uopt->nls_map = load_nls(args[0].from);
 426                         uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
 427                         break;
 428 #endif
 429                 case Opt_uignore:
 430                         uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
 431                         break;
 432                 case Opt_uforget:
 433                         uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
 434                         break;
 435                 case Opt_gignore:
 436                         uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
 437                         break;
 438                 case Opt_gforget:
 439                         uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
 440                         break;
 441                 default:
 442                         printk(KERN_ERR "udf: bad mount option \"%s\" "
 443                                "or missing value\n", p);
 444                         return 0;
 445                 }
 446         }
 447         return 1;
 448 }
 449
 450 void udf_write_super(struct super_block *sb)
 451 {
 452         lock_kernel();
 453
 454         if (!(sb->s_flags & MS_RDONLY))
 455                 udf_open_lvid(sb);
 456         sb->s_dirt = 0;
 457
 458         unlock_kernel();
 459 }
 460
 461 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
 462 {
 463         struct udf_options uopt;
 464
 465         uopt.flags = UDF_SB(sb)->s_flags;
 466         uopt.uid   = UDF_SB(sb)->s_uid;
 467         uopt.gid   = UDF_SB(sb)->s_gid;
 468         uopt.umask = UDF_SB(sb)->s_umask;
 469
 470         if (!udf_parse_options(options, &uopt))
 471                 return -EINVAL;
 472
 473         UDF_SB(sb)->s_flags = uopt.flags;
 474         UDF_SB(sb)->s_uid   = uopt.uid;
 475         UDF_SB(sb)->s_gid   = uopt.gid;
 476         UDF_SB(sb)->s_umask = uopt.umask;
 477
 478         if (UDF_SB_LVIDBH(sb)) {
 479                 int write_rev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev);
 480                 if (write_rev > UDF_MAX_WRITE_VERSION)
 481                         *flags |= MS_RDONLY;
 482         }
 483
 484         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 485                 return 0;
 486         if (*flags & MS_RDONLY)
 487                 udf_close_lvid(sb);
 488         else
 489                 udf_open_lvid(sb);
 490
 491         return 0;
 492 }
 493
 494 /*
 495  * udf_set_blocksize
 496  *
 497  * PURPOSE
 498  *      Set the block size to be used in all transfers.
 499  *
 500  * DESCRIPTION
 501  *      To allow room for a DMA transfer, it is best to guess big when unsure.
 502  *      This routine picks 2048 bytes as the blocksize when guessing. This
 503  *      should be adequate until devices with larger block sizes become common.
 504  *
 505  *      Note that the Linux kernel can currently only deal with blocksizes of
 506  *      512, 1024, 2048, 4096, and 8192 bytes.
 507  *
 508  * PRE-CONDITIONS
 509  *      sb                      Pointer to _locked_ superblock.
 510  *
 511  * POST-CONDITIONS
 512  *      sb->s_blocksize         Blocksize.
 513  *      sb->s_blocksize_bits    log2 of blocksize.
 514  *      <return>        0       Blocksize is valid.
 515  *      <return>        1       Blocksize is invalid.
 516  *
 517  * HISTORY
 518  *      July 1, 1997 - Andrew E. Mileski
 519  *      Written, tested, and released.
 520  */
 521 static int udf_set_blocksize(struct super_block *sb, int bsize)
 522 {
 523         if (!sb_min_blocksize(sb, bsize)) {
 524                 udf_debug("Bad block size (%d)\n", bsize);
 525                 printk(KERN_ERR "udf: bad block size (%d)\n", bsize);
 526                 return 0;
 527         }
 528
 529         return sb->s_blocksize;
 530 }
 531
 532 static int udf_vrs(struct super_block *sb, int silent)
 533 {
 534         struct volStructDesc *vsd = NULL;
 535         int sector = 32768;
 536         int sectorsize;
 537         struct buffer_head *bh = NULL;
 538         int iso9660 = 0;
 539         int nsr02 = 0;
 540         int nsr03 = 0;
 541
 542         /* Block size must be a multiple of 512 */
 543         if (sb->s_blocksize & 511)
 544                 return 0;
 545
 546         if (sb->s_blocksize < sizeof(struct volStructDesc))
 547                 sectorsize = sizeof(struct volStructDesc);
 548         else
 549                 sectorsize = sb->s_blocksize;
 550
 551         sector += (UDF_SB_SESSION(sb) << sb->s_blocksize_bits);
 552
 553         udf_debug("Starting at sector %u (%ld byte sectors)\n",
 554                   (sector >> sb->s_blocksize_bits), sb->s_blocksize);
 555         /* Process the sequence (if applicable) */
 556         for (; !nsr02 && !nsr03; sector += sectorsize) {
 557                 /* Read a block */
 558                 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
 559                 if (!bh)
 560                         break;
 561
 562                 /* Look for ISO  descriptors */
 563                 vsd = (struct volStructDesc *)(bh->b_data +
 564                                                (sector & (sb->s_blocksize - 1)));
 565
 566                 if (vsd->stdIdent[0] == 0) {
 567                         brelse(bh);
 568                         break;
 569                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001, VSD_STD_ID_LEN)) {
 570                         iso9660 = sector;
 571                         switch (vsd->structType) {
 572                         case 0:
 573                                 udf_debug("ISO9660 Boot Record found\n");
 574                                 break;
 575                         case 1:
 576                                 udf_debug
 577                                     ("ISO9660 Primary Volume Descriptor found\n");
 578                                 break;
 579                         case 2:
 580                                 udf_debug
 581                                     ("ISO9660 Supplementary Volume Descriptor found\n");
 582                                 break;
 583                         case 3:
 584                                 udf_debug
 585                                     ("ISO9660 Volume Partition Descriptor found\n");
 586                                 break;
 587                         case 255:
 588                                 udf_debug
 589                                     ("ISO9660 Volume Descriptor Set Terminator found\n");
 590                                 break;
 591                         default:
 592                                 udf_debug("ISO9660 VRS (%u) found\n",
 593                                           vsd->structType);
 594                                 break;
 595                         }
 596                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01, VSD_STD_ID_LEN)) {
 597                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01, VSD_STD_ID_LEN)) {
 598                         brelse(bh);
 599                         break;
 600                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02, VSD_STD_ID_LEN)) {
 601                         nsr02 = sector;
 602                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03, VSD_STD_ID_LEN)) {
 603                         nsr03 = sector;
 604                 }
 605                 brelse(bh);
 606         }
 607
 608         if (nsr03)
 609                 return nsr03;
 610         else if (nsr02)
 611                 return nsr02;
 612         else if (sector - (UDF_SB_SESSION(sb) << sb->s_blocksize_bits) == 32768)
 613                 return -1;
 614         else
 615                 return 0;
 616 }
 617
 618 /*
 619  * udf_find_anchor
 620  *
 621  * PURPOSE
 622  *      Find an anchor volume descriptor.
 623  *
 624  * PRE-CONDITIONS
 625  *      sb                      Pointer to _locked_ superblock.
 626  *      lastblock               Last block on media.
 627  *
 628  * POST-CONDITIONS
 629  *      <return>                1 if not found, 0 if ok
 630  *
 631  * HISTORY
 632  *      July 1, 1997 - Andrew E. Mileski
 633  *      Written, tested, and released.
 634  */
 635 static void udf_find_anchor(struct super_block *sb)
 636 {
 637         int lastblock = UDF_SB_LASTBLOCK(sb);
 638         struct buffer_head *bh = NULL;
 639         uint16_t ident;
 640         uint32_t location;
 641         int i;
 642
 643         if (lastblock) {
 644                 int varlastblock = udf_variable_to_fixed(lastblock);
 645                 int last[] =  { lastblock, lastblock - 2,
 646                                 lastblock - 150, lastblock - 152,
 647                                 varlastblock, varlastblock - 2,
 648                                 varlastblock - 150, varlastblock - 152 };
 649
 650                 lastblock = 0;
 651
 652                 /* Search for an anchor volume descriptor pointer */
 653
 654                 /*  according to spec, anchor is in either:
 655                  *     block 256
 656                  *     lastblock-256
 657                  *     lastblock
 658                  *  however, if the disc isn't closed, it could be 512 */
 659
 660                 for (i = 0; !lastblock && i < ARRAY_SIZE(last); i++) {
 661                         if (last[i] < 0 || !(bh = sb_bread(sb, last[i]))) {
 662                                 ident = location = 0;
 663                         } else {
 664                                 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
 665                                 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
 666                                 brelse(bh);
 667                         }
 668
 669                         if (ident == TAG_IDENT_AVDP) {
 670                                 if (location == last[i] - UDF_SB_SESSION(sb)) {
 671                                         lastblock = UDF_SB_ANCHOR(sb)[0] = last[i] - UDF_SB_SESSION(sb);
 672                                         UDF_SB_ANCHOR(sb)[1] = last[i] - 256 - UDF_SB_SESSION(sb);
 673                                 } else if (location == udf_variable_to_fixed(last[i]) - UDF_SB_SESSION(sb)) {
 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                                 } else {
 678                                         udf_debug("Anchor found at block %d, location mismatch %d.\n",
 679                                                   last[i], location);
 680                                 }
 681                         } else if (ident == TAG_IDENT_FE || ident == TAG_IDENT_EFE) {
 682                                 lastblock = last[i];
 683                                 UDF_SB_ANCHOR(sb)[3] = 512;
 684                         } else {
 685                                 if (last[i] < 256 || !(bh = sb_bread(sb, last[i] - 256))) {
 686                                         ident = location = 0;
 687                                 } else {
 688                                         ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
 689                                         location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
 690                                         brelse(bh);
 691                                 }
 692
 693                                 if (ident == TAG_IDENT_AVDP &&
 694                                     location == last[i] - 256 - UDF_SB_SESSION(sb)) {
 695                                         lastblock = last[i];
 696                                         UDF_SB_ANCHOR(sb)[1] = last[i] - 256;
 697                                 } else {
 698                                         if (last[i] < 312 + UDF_SB_SESSION(sb) ||
 699                                             !(bh = sb_bread(sb, last[i] - 312 - UDF_SB_SESSION(sb)))) {
 700                                                 ident = location = 0;
 701                                         } else {
 702                                                 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
 703                                                 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
 704                                                 brelse(bh);
 705                                         }
 706
 707                                         if (ident == TAG_IDENT_AVDP &&
 708                                             location == udf_variable_to_fixed(last[i]) - 256) {
 709                                                 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
 710                                                 lastblock = udf_variable_to_fixed(last[i]);
 711                                                 UDF_SB_ANCHOR(sb)[1] = lastblock - 256;
 712                                         }
 713                                 }
 714                         }
 715                 }
 716         }
 717
 718         if (!lastblock) {
 719                 /* We havn't found the lastblock. check 312 */
 720                 if ((bh = sb_bread(sb, 312 + UDF_SB_SESSION(sb)))) {
 721                         ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
 722                         location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
 723                         brelse(bh);
 724
 725                         if (ident == TAG_IDENT_AVDP && location == 256)
 726                                 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
 727                 }
 728         }
 729
 730         for (i = 0; i < ARRAY_SIZE(UDF_SB_ANCHOR(sb)); i++) {
 731                 if (UDF_SB_ANCHOR(sb)[i]) {
 732                         if (!(bh = udf_read_tagged(sb, UDF_SB_ANCHOR(sb)[i],
 733                                                    UDF_SB_ANCHOR(sb)[i], &ident))) {
 734                                 UDF_SB_ANCHOR(sb)[i] = 0;
 735                         } else {
 736                                 brelse(bh);
 737                                 if ((ident != TAG_IDENT_AVDP) &&
 738                                     (i || (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE))) {
 739                                         UDF_SB_ANCHOR(sb)[i] = 0;
 740                                 }
 741                         }
 742                 }
 743         }
 744
 745         UDF_SB_LASTBLOCK(sb) = lastblock;
 746 }
 747
 748 static int udf_find_fileset(struct super_block *sb, kernel_lb_addr *fileset, kernel_lb_addr *root)
 749 {
 750         struct buffer_head *bh = NULL;
 751         long lastblock;
 752         uint16_t ident;
 753
 754         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
 755             fileset->partitionReferenceNum != 0xFFFF) {
 756                 bh = udf_read_ptagged(sb, *fileset, 0, &ident);
 757
 758                 if (!bh) {
 759                         return 1;
 760                 } else if (ident != TAG_IDENT_FSD) {
 761                         brelse(bh);
 762                         return 1;
 763                 }
 764
 765         }
 766
 767         if (!bh) { /* Search backwards through the partitions */
 768                 kernel_lb_addr newfileset;
 769
 770 /* --> cvg: FIXME - is it reasonable? */
 771                 return 1;
 772
 773                 for (newfileset.partitionReferenceNum = UDF_SB_NUMPARTS(sb) - 1;
 774                      (newfileset.partitionReferenceNum != 0xFFFF &&
 775                       fileset->logicalBlockNum == 0xFFFFFFFF &&
 776                       fileset->partitionReferenceNum == 0xFFFF);
 777                      newfileset.partitionReferenceNum--) {
 778                         lastblock = UDF_SB_PARTLEN(sb, newfileset.partitionReferenceNum);
 779                         newfileset.logicalBlockNum = 0;
 780
 781                         do {
 782                                 bh = udf_read_ptagged(sb, newfileset, 0, &ident);
 783                                 if (!bh) {
 784                                         newfileset.logicalBlockNum++;
 785                                         continue;
 786                                 }
 787
 788                                 switch (ident) {
 789                                 case TAG_IDENT_SBD:
 790                                 {
 791                                         struct spaceBitmapDesc *sp;
 792                                         sp = (struct spaceBitmapDesc *)bh->b_data;
 793                                         newfileset.logicalBlockNum += 1 +
 794                                                 ((le32_to_cpu(sp->numOfBytes) +
 795                                                   sizeof(struct spaceBitmapDesc) - 1)
 796                                                  >> sb->s_blocksize_bits);
 797                                         brelse(bh);
 798                                         break;
 799                                 }
 800                                 case TAG_IDENT_FSD:
 801                                         *fileset = newfileset;
 802                                         break;
 803                                 default:
 804                                         newfileset.logicalBlockNum++;
 805                                         brelse(bh);
 806                                         bh = NULL;
 807                                         break;
 808                                 }
 809                         } while (newfileset.logicalBlockNum < lastblock &&
 810                                  fileset->logicalBlockNum == 0xFFFFFFFF &&
 811                                  fileset->partitionReferenceNum == 0xFFFF);
 812                 }
 813         }
 814
 815         if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
 816              fileset->partitionReferenceNum != 0xFFFF) && bh) {
 817                 udf_debug("Fileset at block=%d, partition=%d\n",
 818                           fileset->logicalBlockNum,
 819                           fileset->partitionReferenceNum);
 820
 821                 UDF_SB_PARTITION(sb) = fileset->partitionReferenceNum;
 822                 udf_load_fileset(sb, bh, root);
 823                 brelse(bh);
 824                 return 0;
 825         }
 826         return 1;
 827 }
 828
 829 static void udf_load_pvoldesc(struct super_block *sb, struct buffer_head *bh)
 830 {
 831         struct primaryVolDesc *pvoldesc;
 832         time_t recording;
 833         long recording_usec;
 834         struct ustr instr;
 835         struct ustr outstr;
 836
 837         pvoldesc = (struct primaryVolDesc *)bh->b_data;
 838
 839         if (udf_stamp_to_time(&recording, &recording_usec,
 840                               lets_to_cpu(pvoldesc->recordingDateAndTime))) {
 841                 kernel_timestamp ts;
 842                 ts = lets_to_cpu(pvoldesc->recordingDateAndTime);
 843                 udf_debug("recording time %ld/%ld, %04u/%02u/%02u %02u:%02u (%x)\n",
 844                           recording, recording_usec,
 845                           ts.year, ts.month, ts.day, ts.hour,
 846                           ts.minute, ts.typeAndTimezone);
 847                 UDF_SB_RECORDTIME(sb).tv_sec = recording;
 848                 UDF_SB_RECORDTIME(sb).tv_nsec = recording_usec * 1000;
 849         }
 850
 851         if (!udf_build_ustr(&instr, pvoldesc->volIdent, 32)) {
 852                 if (udf_CS0toUTF8(&outstr, &instr)) {
 853                         strncpy(UDF_SB_VOLIDENT(sb), outstr.u_name,
 854                                 outstr.u_len > 31 ? 31 : outstr.u_len);
 855                         udf_debug("volIdent[] = '%s'\n", UDF_SB_VOLIDENT(sb));
 856                 }
 857         }
 858
 859         if (!udf_build_ustr(&instr, pvoldesc->volSetIdent, 128)) {
 860                 if (udf_CS0toUTF8(&outstr, &instr))
 861                         udf_debug("volSetIdent[] = '%s'\n", outstr.u_name);
 862         }
 863 }
 864
 865 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
 866                              kernel_lb_addr *root)
 867 {
 868         struct fileSetDesc *fset;
 869
 870         fset = (struct fileSetDesc *)bh->b_data;
 871
 872         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
 873
 874         UDF_SB_SERIALNUM(sb) = le16_to_cpu(fset->descTag.tagSerialNum);
 875
 876         udf_debug("Rootdir at block=%d, partition=%d\n",
 877                   root->logicalBlockNum, root->partitionReferenceNum);
 878 }
 879
 880 static int udf_load_partdesc(struct super_block *sb, struct buffer_head *bh)
 881 {
 882         struct partitionDesc *p;
 883         int i;
 884
 885         p = (struct partitionDesc *)bh->b_data;
 886
 887         for (i = 0; i < UDF_SB_NUMPARTS(sb); i++) {
 888                 udf_debug("Searching map: (%d == %d)\n",
 889                           UDF_SB_PARTMAPS(sb)[i].s_partition_num, le16_to_cpu(p->partitionNumber));
 890                 if (UDF_SB_PARTMAPS(sb)[i].s_partition_num == le16_to_cpu(p->partitionNumber)) {
 891                         UDF_SB_PARTLEN(sb,i) = le32_to_cpu(p->partitionLength); /* blocks */
 892                         UDF_SB_PARTROOT(sb,i) = le32_to_cpu(p->partitionStartingLocation);
 893                         if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_READ_ONLY)
 894                                 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_READ_ONLY;
 895                         if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_WRITE_ONCE)
 896                                 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_WRITE_ONCE;
 897                         if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_REWRITABLE)
 898                                 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_REWRITABLE;
 899                         if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_OVERWRITABLE)
 900                                 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_OVERWRITABLE;
 901
 902                         if (!strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) ||
 903                             !strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03)) {
 904                                 struct partitionHeaderDesc *phd;
 905
 906                                 phd = (struct partitionHeaderDesc *)(p->partitionContentsUse);
 907                                 if (phd->unallocSpaceTable.extLength) {
 908                                         kernel_lb_addr loc = {
 909                                                 .logicalBlockNum = le32_to_cpu(phd->unallocSpaceTable.extPosition),
 910                                                 .partitionReferenceNum = i,
 911                                         };
 912
 913                                         UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table =
 914                                                 udf_iget(sb, loc);
 915                                         if (!UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table) {
 916                                                 udf_debug("cannot load unallocSpaceTable (part %d)\n", i);
 917                                                 return 1;
 918                                         }
 919                                         UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_UNALLOC_TABLE;
 920                                         udf_debug("unallocSpaceTable (part %d) @ %ld\n",
 921                                                   i, UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table->i_ino);
 922                                 }
 923                                 if (phd->unallocSpaceBitmap.extLength) {
 924                                         UDF_SB_ALLOC_BITMAP(sb, i, s_uspace);
 925                                         if (UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap != NULL) {
 926                                                 UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extLength =
 927                                                         le32_to_cpu(phd->unallocSpaceBitmap.extLength);
 928                                                 UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extPosition =
 929                                                         le32_to_cpu(phd->unallocSpaceBitmap.extPosition);
 930                                                 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_UNALLOC_BITMAP;
 931                                                 udf_debug("unallocSpaceBitmap (part %d) @ %d\n",
 932                                                           i, UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extPosition);
 933                                         }
 934                                 }
 935                                 if (phd->partitionIntegrityTable.extLength)
 936                                         udf_debug("partitionIntegrityTable (part %d)\n", i);
 937                                 if (phd->freedSpaceTable.extLength) {
 938                                         kernel_lb_addr loc = {
 939                                                 .logicalBlockNum = le32_to_cpu(phd->freedSpaceTable.extPosition),
 940                                                 .partitionReferenceNum = i,
 941                                         };
 942
 943                                         UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table =
 944                                                 udf_iget(sb, loc);
 945                                         if (!UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table) {
 946                                                 udf_debug("cannot load freedSpaceTable (part %d)\n", i);
 947                                                 return 1;
 948                                         }
 949                                         UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_FREED_TABLE;
 950                                         udf_debug("freedSpaceTable (part %d) @ %ld\n",
 951                                                   i, UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table->i_ino);
 952                                 }
 953                                 if (phd->freedSpaceBitmap.extLength) {
 954                                         UDF_SB_ALLOC_BITMAP(sb, i, s_fspace);
 955                                         if (UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap != NULL) {
 956                                                 UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extLength =
 957                                                         le32_to_cpu(phd->freedSpaceBitmap.extLength);
 958                                                 UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extPosition =
 959                                                         le32_to_cpu(phd->freedSpaceBitmap.extPosition);
 960                                                 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_FREED_BITMAP;
 961                                                 udf_debug("freedSpaceBitmap (part %d) @ %d\n",
 962                                                           i, UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extPosition);
 963                                         }
 964                                 }
 965                         }
 966                         break;
 967                 }
 968         }
 969         if (i == UDF_SB_NUMPARTS(sb)) {
 970                 udf_debug("Partition (%d) not found in partition map\n",
 971                           le16_to_cpu(p->partitionNumber));
 972         } else {
 973                 udf_debug("Partition (%d:%d type %x) starts at physical %d, block length %d\n",
 974                           le16_to_cpu(p->partitionNumber), i, UDF_SB_PARTTYPE(sb,i),
 975                           UDF_SB_PARTROOT(sb,i), UDF_SB_PARTLEN(sb,i));
 976         }
 977         return 0;
 978 }
 979
 980 static int udf_load_logicalvol(struct super_block *sb, struct buffer_head *bh,
 981                                kernel_lb_addr *fileset)
 982 {
 983         struct logicalVolDesc *lvd;
 984         int i, j, offset;
 985         uint8_t type;
 986
 987         lvd = (struct logicalVolDesc *)bh->b_data;
 988
 989         UDF_SB_ALLOC_PARTMAPS(sb, le32_to_cpu(lvd->numPartitionMaps));
 990
 991         for (i = 0, offset = 0;
 992              i < UDF_SB_NUMPARTS(sb) && offset < le32_to_cpu(lvd->mapTableLength);
 993              i++, offset += ((struct genericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapLength) {
 994                 type = ((struct genericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapType;
 995                 if (type == 1) {
 996                         struct genericPartitionMap1 *gpm1 = (struct genericPartitionMap1 *)&(lvd->partitionMaps[offset]);
 997                         UDF_SB_PARTTYPE(sb,i) = UDF_TYPE1_MAP15;
 998                         UDF_SB_PARTVSN(sb,i) = le16_to_cpu(gpm1->volSeqNum);
 999                         UDF_SB_PARTNUM(sb,i) = le16_to_cpu(gpm1->partitionNum);
1000                         UDF_SB_PARTFUNC(sb,i) = NULL;
1001                 } else if (type == 2) {
1002                         struct udfPartitionMap2 *upm2 = (struct udfPartitionMap2 *)&(lvd->partitionMaps[offset]);
1003                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL, strlen(UDF_ID_VIRTUAL))) {
1004                                 if (le16_to_cpu(((__le16 *)upm2->partIdent.identSuffix)[0]) == 0x0150) {
1005                                         UDF_SB_PARTTYPE(sb,i) = UDF_VIRTUAL_MAP15;
1006                                         UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_virt15;
1007                                 } else if (le16_to_cpu(((__le16 *)upm2->partIdent.identSuffix)[0]) == 0x0200) {
1008                                         UDF_SB_PARTTYPE(sb,i) = UDF_VIRTUAL_MAP20;
1009                                         UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_virt20;
1010                                 }
1011                         } else if (!strncmp(upm2->partIdent.ident, UDF_ID_SPARABLE, strlen(UDF_ID_SPARABLE))) {
1012                                 uint32_t loc;
1013                                 uint16_t ident;
1014                                 struct sparingTable *st;
1015                                 struct sparablePartitionMap *spm = (struct sparablePartitionMap *)&(lvd->partitionMaps[offset]);
1016
1017                                 UDF_SB_PARTTYPE(sb,i) = UDF_SPARABLE_MAP15;
1018                                 UDF_SB_TYPESPAR(sb,i).s_packet_len = le16_to_cpu(spm->packetLength);
1019                                 for (j = 0; j < spm->numSparingTables; j++) {
1020                                         loc = le32_to_cpu(spm->locSparingTable[j]);
1021                                         UDF_SB_TYPESPAR(sb,i).s_spar_map[j] =
1022                                                 udf_read_tagged(sb, loc, loc, &ident);
1023                                         if (UDF_SB_TYPESPAR(sb,i).s_spar_map[j] != NULL) {
1024                                                 st = (struct sparingTable *)UDF_SB_TYPESPAR(sb,i).s_spar_map[j]->b_data;
1025                                                 if (ident != 0 ||
1026                                                     strncmp(st->sparingIdent.ident, UDF_ID_SPARING, strlen(UDF_ID_SPARING))) {
1027                                                         brelse(UDF_SB_TYPESPAR(sb,i).s_spar_map[j]);
1028                                                         UDF_SB_TYPESPAR(sb,i).s_spar_map[j] = NULL;
1029                                                 }
1030                                         }
1031                                 }
1032                                 UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_spar15;
1033                         } else {
1034                                 udf_debug("Unknown ident: %s\n", upm2->partIdent.ident);
1035                                 continue;
1036                         }
1037                         UDF_SB_PARTVSN(sb,i) = le16_to_cpu(upm2->volSeqNum);
1038                         UDF_SB_PARTNUM(sb,i) = le16_to_cpu(upm2->partitionNum);
1039                 }
1040                 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1041                           i, UDF_SB_PARTNUM(sb,i), type, UDF_SB_PARTVSN(sb,i));
1042         }
1043
1044         if (fileset) {
1045                 long_ad *la = (long_ad *)&(lvd->logicalVolContentsUse[0]);
1046
1047                 *fileset = lelb_to_cpu(la->extLocation);
1048                 udf_debug("FileSet found in LogicalVolDesc at block=%d, partition=%d\n",
1049                           fileset->logicalBlockNum,
1050                           fileset->partitionReferenceNum);
1051         }
1052         if (lvd->integritySeqExt.extLength)
1053                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1054
1055         return 0;
1056 }
1057
1058 /*
1059  * udf_load_logicalvolint
1060  *
1061  */
1062 static void udf_load_logicalvolint(struct super_block *sb, kernel_extent_ad loc)
1063 {
1064         struct buffer_head *bh = NULL;
1065         uint16_t ident;
1066
1067         while (loc.extLength > 0 &&
1068                (bh = udf_read_tagged(sb, loc.extLocation,
1069                                      loc.extLocation, &ident)) &&
1070                ident == TAG_IDENT_LVID) {
1071                 UDF_SB_LVIDBH(sb) = bh;
1072
1073                 if (UDF_SB_LVID(sb)->nextIntegrityExt.extLength)
1074                         udf_load_logicalvolint(sb, leea_to_cpu(UDF_SB_LVID(sb)->nextIntegrityExt));
1075
1076                 if (UDF_SB_LVIDBH(sb) != bh)
1077                         brelse(bh);
1078                 loc.extLength -= sb->s_blocksize;
1079                 loc.extLocation++;
1080         }
1081         if (UDF_SB_LVIDBH(sb) != bh)
1082                 brelse(bh);
1083 }
1084
1085 /*
1086  * udf_process_sequence
1087  *
1088  * PURPOSE
1089  *      Process a main/reserve volume descriptor sequence.
1090  *
1091  * PRE-CONDITIONS
1092  *      sb                      Pointer to _locked_ superblock.
1093  *      block                   First block of first extent of the sequence.
1094  *      lastblock               Lastblock of first extent of the sequence.
1095  *
1096  * HISTORY
1097  *      July 1, 1997 - Andrew E. Mileski
1098  *      Written, tested, and released.
1099  */
1100 static int udf_process_sequence(struct super_block *sb, long block, long lastblock,
1101                                  kernel_lb_addr *fileset)
1102 {
1103         struct buffer_head *bh = NULL;
1104         struct udf_vds_record vds[VDS_POS_LENGTH];
1105         struct generic_desc *gd;
1106         struct volDescPtr *vdp;
1107         int done = 0;
1108         int i, j;
1109         uint32_t vdsn;
1110         uint16_t ident;
1111         long next_s = 0, next_e = 0;
1112
1113         memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1114
1115         /* Read the main descriptor sequence */
1116         for (; (!done && block <= lastblock); block++) {
1117
1118                 bh = udf_read_tagged(sb, block, block, &ident);
1119                 if (!bh)
1120                         break;
1121
1122                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1123                 gd = (struct generic_desc *)bh->b_data;
1124                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1125                 switch (ident) {
1126                 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1127                         if (vdsn >= vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum) {
1128                                 vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum = vdsn;
1129                                 vds[VDS_POS_PRIMARY_VOL_DESC].block = block;
1130                         }
1131                         break;
1132                 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1133                         if (vdsn >= vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum) {
1134                                 vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum = vdsn;
1135                                 vds[VDS_POS_VOL_DESC_PTR].block = block;
1136
1137                                 vdp = (struct volDescPtr *)bh->b_data;
1138                                 next_s = le32_to_cpu(vdp->nextVolDescSeqExt.extLocation);
1139                                 next_e = le32_to_cpu(vdp->nextVolDescSeqExt.extLength);
1140                                 next_e = next_e >> sb->s_blocksize_bits;
1141                                 next_e += next_s;
1142                         }
1143                         break;
1144                 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1145                         if (vdsn >= vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum) {
1146                                 vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum = vdsn;
1147                                 vds[VDS_POS_IMP_USE_VOL_DESC].block = block;
1148                         }
1149                         break;
1150                 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1151                         if (!vds[VDS_POS_PARTITION_DESC].block)
1152                                 vds[VDS_POS_PARTITION_DESC].block = block;
1153                         break;
1154                 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1155                         if (vdsn >= vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum) {
1156                                 vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum = vdsn;
1157                                 vds[VDS_POS_LOGICAL_VOL_DESC].block = block;
1158                         }
1159                         break;
1160                 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1161                         if (vdsn >= vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum) {
1162                                 vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum = vdsn;
1163                                 vds[VDS_POS_UNALLOC_SPACE_DESC].block = block;
1164                         }
1165                         break;
1166                 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1167                         vds[VDS_POS_TERMINATING_DESC].block = block;
1168                         if (next_e) {
1169                                 block = next_s;
1170                                 lastblock = next_e;
1171                                 next_s = next_e = 0;
1172                         } else {
1173                                 done = 1;
1174                         }
1175                         break;
1176                 }
1177                 brelse(bh);
1178         }
1179         for (i = 0; i < VDS_POS_LENGTH; i++) {
1180                 if (vds[i].block) {
1181                         bh = udf_read_tagged(sb, vds[i].block, vds[i].block, &ident);
1182
1183                         if (i == VDS_POS_PRIMARY_VOL_DESC) {
1184                                 udf_load_pvoldesc(sb, bh);
1185                         } else if (i == VDS_POS_LOGICAL_VOL_DESC) {
1186                                 udf_load_logicalvol(sb, bh, fileset);
1187                         } else if (i == VDS_POS_PARTITION_DESC) {
1188                                 struct buffer_head *bh2 = NULL;
1189                                 if (udf_load_partdesc(sb, bh)) {
1190                                         brelse(bh);
1191                                         return 1;
1192                                 }
1193                                 for (j = vds[i].block + 1; j <  vds[VDS_POS_TERMINATING_DESC].block; j++) {
1194                                         bh2 = udf_read_tagged(sb, j, j, &ident);
1195                                         gd = (struct generic_desc *)bh2->b_data;
1196                                         if (ident == TAG_IDENT_PD)
1197                                                 if (udf_load_partdesc(sb, bh2)) {
1198                                                         brelse(bh);
1199                                                         brelse(bh2);
1200                                                         return 1;
1201                                                 }
1202                                         brelse(bh2);
1203                                 }
1204                         }
1205                         brelse(bh);
1206                 }
1207         }
1208
1209         return 0;
1210 }
1211
1212 /*
1213  * udf_check_valid()
1214  */
1215 static int udf_check_valid(struct super_block *sb, int novrs, int silent)
1216 {
1217         long block;
1218
1219         if (novrs) {
1220                 udf_debug("Validity check skipped because of novrs option\n");
1221                 return 0;
1222         }
1223         /* Check that it is NSR02 compliant */
1224         /* Process any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
1225         else if ((block = udf_vrs(sb, silent)) == -1) {
1226                 udf_debug("Failed to read byte 32768. Assuming open disc. "
1227                           "Skipping validity check\n");
1228                 if (!UDF_SB_LASTBLOCK(sb))
1229                         UDF_SB_LASTBLOCK(sb) = udf_get_last_block(sb);
1230                 return 0;
1231         } else {
1232                 return !block;
1233         }
1234 }
1235
1236 static int udf_load_partition(struct super_block *sb, kernel_lb_addr *fileset)
1237 {
1238         struct anchorVolDescPtr *anchor;
1239         uint16_t ident;
1240         struct buffer_head *bh;
1241         long main_s, main_e, reserve_s, reserve_e;
1242         int i, j;
1243
1244         if (!sb)
1245                 return 1;
1246
1247         for (i = 0; i < ARRAY_SIZE(UDF_SB_ANCHOR(sb)); i++) {
1248                 if (UDF_SB_ANCHOR(sb)[i] &&
1249                     (bh = udf_read_tagged(sb, UDF_SB_ANCHOR(sb)[i],
1250                                           UDF_SB_ANCHOR(sb)[i], &ident))) {
1251                         anchor = (struct anchorVolDescPtr *)bh->b_data;
1252
1253                         /* Locate the main sequence */
1254                         main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1255                         main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength );
1256                         main_e = main_e >> sb->s_blocksize_bits;
1257                         main_e += main_s;
1258
1259                         /* Locate the reserve sequence */
1260                         reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1261                         reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1262                         reserve_e = reserve_e >> sb->s_blocksize_bits;
1263                         reserve_e += reserve_s;
1264
1265                         brelse(bh);
1266
1267                         /* Process the main & reserve sequences */
1268                         /* responsible for finding the PartitionDesc(s) */
1269                         if (!(udf_process_sequence(sb, main_s, main_e, fileset) &&
1270                               udf_process_sequence(sb, reserve_s, reserve_e, fileset))) {
1271                                 break;
1272                         }
1273                 }
1274         }
1275
1276         if (i == ARRAY_SIZE(UDF_SB_ANCHOR(sb))) {
1277                 udf_debug("No Anchor block found\n");
1278                 return 1;
1279         } else
1280                 udf_debug("Using anchor in block %d\n", UDF_SB_ANCHOR(sb)[i]);
1281
1282         for (i = 0; i < UDF_SB_NUMPARTS(sb); i++) {
1283                 kernel_lb_addr uninitialized_var(ino);
1284                 switch (UDF_SB_PARTTYPE(sb, i)) {
1285                 case UDF_VIRTUAL_MAP15:
1286                 case UDF_VIRTUAL_MAP20:
1287                         if (!UDF_SB_LASTBLOCK(sb)) {
1288                                 UDF_SB_LASTBLOCK(sb) = udf_get_last_block(sb);
1289                                 udf_find_anchor(sb);
1290                         }
1291
1292                         if (!UDF_SB_LASTBLOCK(sb)) {
1293                                 udf_debug("Unable to determine Lastblock (For "
1294                                           "Virtual Partition)\n");
1295                                 return 1;
1296                         }
1297
1298                         for (j = 0; j < UDF_SB_NUMPARTS(sb); j++) {
1299                                 if (j != i &&
1300                                     UDF_SB_PARTVSN(sb, i) == UDF_SB_PARTVSN(sb, j) &&
1301                                     UDF_SB_PARTNUM(sb, i) == UDF_SB_PARTNUM(sb, j)) {
1302                                         ino.partitionReferenceNum = j;
1303                                         ino.logicalBlockNum = UDF_SB_LASTBLOCK(sb) - UDF_SB_PARTROOT(sb, j);
1304                                         break;
1305                                 }
1306                         }
1307
1308                         if (j == UDF_SB_NUMPARTS(sb))
1309                                 return 1;
1310
1311                         if (!(UDF_SB_VAT(sb) = udf_iget(sb, ino)))
1312                                 return 1;
1313
1314                         if (UDF_SB_PARTTYPE(sb, i) == UDF_VIRTUAL_MAP15) {
1315                                 UDF_SB_TYPEVIRT(sb, i).s_start_offset =
1316                                         udf_ext0_offset(UDF_SB_VAT(sb));
1317                                 UDF_SB_TYPEVIRT(sb, i).s_num_entries =
1318                                         (UDF_SB_VAT(sb)->i_size - 36) >> 2;
1319                         } else if (UDF_SB_PARTTYPE(sb, i) == UDF_VIRTUAL_MAP20) {
1320                                 struct buffer_head *bh = NULL;
1321                                 uint32_t pos;
1322
1323                                 pos = udf_block_map(UDF_SB_VAT(sb), 0);
1324                                 bh = sb_bread(sb, pos);
1325                                 if (!bh)
1326                                         return 1;
1327                                 UDF_SB_TYPEVIRT(sb, i).s_start_offset =
1328                                         le16_to_cpu(((struct virtualAllocationTable20 *)bh->b_data +
1329                                                      udf_ext0_offset(UDF_SB_VAT(sb)))->lengthHeader) +
1330                                         udf_ext0_offset(UDF_SB_VAT(sb));
1331                                 UDF_SB_TYPEVIRT(sb, i).s_num_entries = (UDF_SB_VAT(sb)->i_size -
1332                                                                         UDF_SB_TYPEVIRT(sb, i).s_start_offset) >> 2;
1333                                 brelse(bh);
1334                         }
1335                         UDF_SB_PARTROOT(sb, i) = udf_get_pblock(sb, 0, i, 0);
1336                         UDF_SB_PARTLEN(sb, i) = UDF_SB_PARTLEN(sb, ino.partitionReferenceNum);
1337                 }
1338         }
1339         return 0;
1340 }
1341
1342 static void udf_open_lvid(struct super_block *sb)
1343 {
1344         if (UDF_SB_LVIDBH(sb)) {
1345                 int i;
1346                 kernel_timestamp cpu_time;
1347
1348                 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1349                 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1350                 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
1351                         UDF_SB_LVID(sb)->recordingDateAndTime = cpu_to_lets(cpu_time);
1352                 UDF_SB_LVID(sb)->integrityType = LVID_INTEGRITY_TYPE_OPEN;
1353
1354                 UDF_SB_LVID(sb)->descTag.descCRC = cpu_to_le16(udf_crc((char *)UDF_SB_LVID(sb) + sizeof(tag),
1355                                                                        le16_to_cpu(UDF_SB_LVID(sb)->descTag.descCRCLength), 0));
1356
1357                 UDF_SB_LVID(sb)->descTag.tagChecksum = 0;
1358                 for (i = 0; i < 16; i++)
1359                         if (i != 4)
1360                                 UDF_SB_LVID(sb)->descTag.tagChecksum +=
1361                                         ((uint8_t *) &(UDF_SB_LVID(sb)->descTag))[i];
1362
1363                 mark_buffer_dirty(UDF_SB_LVIDBH(sb));
1364         }
1365 }
1366
1367 static void udf_close_lvid(struct super_block *sb)
1368 {
1369         kernel_timestamp cpu_time;
1370         int i;
1371
1372         if (UDF_SB_LVIDBH(sb) &&
1373             UDF_SB_LVID(sb)->integrityType == LVID_INTEGRITY_TYPE_OPEN) {
1374                 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1375                 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1376                 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
1377                         UDF_SB_LVID(sb)->recordingDateAndTime = cpu_to_lets(cpu_time);
1378                 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(UDF_SB_LVIDIU(sb)->maxUDFWriteRev))
1379                         UDF_SB_LVIDIU(sb)->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1380                 if (UDF_SB_UDFREV(sb) > le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev))
1381                         UDF_SB_LVIDIU(sb)->minUDFReadRev = cpu_to_le16(UDF_SB_UDFREV(sb));
1382                 if (UDF_SB_UDFREV(sb) > le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev))
1383                         UDF_SB_LVIDIU(sb)->minUDFWriteRev = cpu_to_le16(UDF_SB_UDFREV(sb));
1384                 UDF_SB_LVID(sb)->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1385
1386                 UDF_SB_LVID(sb)->descTag.descCRC =
1387                         cpu_to_le16(udf_crc((char *)UDF_SB_LVID(sb) + sizeof(tag),
1388                                             le16_to_cpu(UDF_SB_LVID(sb)->descTag.descCRCLength), 0));
1389
1390                 UDF_SB_LVID(sb)->descTag.tagChecksum = 0;
1391                 for (i = 0; i < 16; i++)
1392                         if (i != 4)
1393                                 UDF_SB_LVID(sb)->descTag.tagChecksum +=
1394                                         ((uint8_t *)&(UDF_SB_LVID(sb)->descTag))[i];
1395
1396                 mark_buffer_dirty(UDF_SB_LVIDBH(sb));
1397         }
1398 }
1399
1400 /*
1401  * udf_read_super
1402  *
1403  * PURPOSE
1404  *      Complete the specified super block.
1405  *
1406  * PRE-CONDITIONS
1407  *      sb                      Pointer to superblock to complete - never NULL.
1408  *      sb->s_dev               Device to read suberblock from.
1409  *      options                 Pointer to mount options.
1410  *      silent                  Silent flag.
1411  *
1412  * HISTORY
1413  *      July 1, 1997 - Andrew E. Mileski
1414  *      Written, tested, and released.
1415  */
1416 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1417 {
1418         int i;
1419         struct inode *inode = NULL;
1420         struct udf_options uopt;
1421         kernel_lb_addr rootdir, fileset;
1422         struct udf_sb_info *sbi;
1423
1424         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1425         uopt.uid = -1;
1426         uopt.gid = -1;
1427         uopt.umask = 0;
1428
1429         sbi = kmalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1430         if (!sbi)
1431                 return -ENOMEM;
1432
1433         sb->s_fs_info = sbi;
1434         memset(UDF_SB(sb), 0x00, sizeof(struct udf_sb_info));
1435
1436         mutex_init(&sbi->s_alloc_mutex);
1437
1438         if (!udf_parse_options((char *)options, &uopt))
1439                 goto error_out;
1440
1441         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1442             uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
1443                 udf_error(sb, "udf_read_super",
1444                           "utf8 cannot be combined with iocharset\n");
1445                 goto error_out;
1446         }
1447 #ifdef CONFIG_UDF_NLS
1448         if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1449                 uopt.nls_map = load_nls_default();
1450                 if (!uopt.nls_map)
1451                         uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1452                 else
1453                         udf_debug("Using default NLS map\n");
1454         }
1455 #endif
1456         if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1457                 uopt.flags |= (1 << UDF_FLAG_UTF8);
1458
1459         fileset.logicalBlockNum = 0xFFFFFFFF;
1460         fileset.partitionReferenceNum = 0xFFFF;
1461
1462         UDF_SB(sb)->s_flags = uopt.flags;
1463         UDF_SB(sb)->s_uid = uopt.uid;
1464         UDF_SB(sb)->s_gid = uopt.gid;
1465         UDF_SB(sb)->s_umask = uopt.umask;
1466         UDF_SB(sb)->s_nls_map = uopt.nls_map;
1467
1468         /* Set the block size for all transfers */
1469         if (!udf_set_blocksize(sb, uopt.blocksize))
1470                 goto error_out;
1471
1472         if (uopt.session == 0xFFFFFFFF)
1473                 UDF_SB_SESSION(sb) = udf_get_last_session(sb);
1474         else
1475                 UDF_SB_SESSION(sb) = uopt.session;
1476
1477         udf_debug("Multi-session=%d\n", UDF_SB_SESSION(sb));
1478
1479         UDF_SB_LASTBLOCK(sb) = uopt.lastblock;
1480         UDF_SB_ANCHOR(sb)[0] = UDF_SB_ANCHOR(sb)[1] = 0;
1481         UDF_SB_ANCHOR(sb)[2] = uopt.anchor;
1482         UDF_SB_ANCHOR(sb)[3] = 256;
1483
1484         if (udf_check_valid(sb, uopt.novrs, silent)) { /* read volume recognition sequences */
1485                 printk("UDF-fs: No VRS found\n");
1486                 goto error_out;
1487         }
1488
1489         udf_find_anchor(sb);
1490
1491         /* Fill in the rest of the superblock */
1492         sb->s_op = &udf_sb_ops;
1493         sb->dq_op = NULL;
1494         sb->s_dirt = 0;
1495         sb->s_magic = UDF_SUPER_MAGIC;
1496         sb->s_time_gran = 1000;
1497
1498         if (udf_load_partition(sb, &fileset)) {
1499                 printk("UDF-fs: No partition found (1)\n");
1500                 goto error_out;
1501         }
1502
1503         udf_debug("Lastblock=%d\n", UDF_SB_LASTBLOCK(sb));
1504
1505         if (UDF_SB_LVIDBH(sb)) {
1506                 uint16_t minUDFReadRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev);
1507                 uint16_t minUDFWriteRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev);
1508                 /* uint16_t maxUDFWriteRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->maxUDFWriteRev); */
1509
1510                 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
1511                         printk("UDF-fs: minUDFReadRev=%x (max is %x)\n",
1512                                le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev),
1513                                UDF_MAX_READ_VERSION);
1514                         goto error_out;
1515                 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION) {
1516                         sb->s_flags |= MS_RDONLY;
1517                 }
1518
1519                 UDF_SB_UDFREV(sb) = minUDFWriteRev;
1520
1521                 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1522                         UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
1523                 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
1524                         UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
1525         }
1526
1527         if (!UDF_SB_NUMPARTS(sb)) {
1528                 printk("UDF-fs: No partition found (2)\n");
1529                 goto error_out;
1530         }
1531
1532         if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_READ_ONLY) {
1533                 printk("UDF-fs: Partition marked readonly; forcing readonly mount\n");
1534                 sb->s_flags |= MS_RDONLY;
1535         }
1536
1537         if (udf_find_fileset(sb, &fileset, &rootdir)) {
1538                 printk("UDF-fs: No fileset found\n");
1539                 goto error_out;
1540         }
1541
1542         if (!silent) {
1543                 kernel_timestamp ts;
1544                 udf_time_to_stamp(&ts, UDF_SB_RECORDTIME(sb));
1545                 udf_info("UDF %s (%s) Mounting volume '%s', "
1546                          "timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
1547                          UDFFS_VERSION, UDFFS_DATE,
1548                          UDF_SB_VOLIDENT(sb), ts.year, ts.month, ts.day, ts.hour, ts.minute,
1549                          ts.typeAndTimezone);
1550         }
1551         if (!(sb->s_flags & MS_RDONLY))
1552                 udf_open_lvid(sb);
1553
1554         /* Assign the root inode */
1555         /* assign inodes by physical block number */
1556         /* perhaps it's not extensible enough, but for now ... */
1557         inode = udf_iget(sb, rootdir);
1558         if (!inode) {
1559                 printk("UDF-fs: Error in udf_iget, block=%d, partition=%d\n",
1560                        rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
1561                 goto error_out;
1562         }
1563
1564         /* Allocate a dentry for the root inode */
1565         sb->s_root = d_alloc_root(inode);
1566         if (!sb->s_root) {
1567                 printk("UDF-fs: Couldn't allocate root dentry\n");
1568                 iput(inode);
1569                 goto error_out;
1570         }
1571         sb->s_maxbytes = MAX_LFS_FILESIZE;
1572         return 0;
1573
1574 error_out:
1575         if (UDF_SB_VAT(sb))
1576                 iput(UDF_SB_VAT(sb));
1577         if (UDF_SB_NUMPARTS(sb)) {
1578                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1579                         iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1580                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1581                         iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1582                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1583                         UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb), s_uspace);
1584                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1585                         UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb), s_fspace);
1586                 if (UDF_SB_PARTTYPE(sb, UDF_SB_PARTITION(sb)) == UDF_SPARABLE_MAP15) {
1587                         for (i = 0; i < 4; i++)
1588                                 brelse(UDF_SB_TYPESPAR(sb, UDF_SB_PARTITION(sb)).s_spar_map[i]);
1589                 }
1590         }
1591 #ifdef CONFIG_UDF_NLS
1592         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1593                 unload_nls(UDF_SB(sb)->s_nls_map);
1594 #endif
1595         if (!(sb->s_flags & MS_RDONLY))
1596                 udf_close_lvid(sb);
1597         brelse(UDF_SB_LVIDBH(sb));
1598         UDF_SB_FREE(sb);
1599         kfree(sbi);
1600         sb->s_fs_info = NULL;
1601
1602         return -EINVAL;
1603 }
1604
1605 void udf_error(struct super_block *sb, const char *function,
1606                const char *fmt, ...)
1607 {
1608         va_list args;
1609
1610         if (!(sb->s_flags & MS_RDONLY)) {
1611                 /* mark sb error */
1612                 sb->s_dirt = 1;
1613         }
1614         va_start(args, fmt);
1615         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1616         va_end(args);
1617         printk (KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
1618                 sb->s_id, function, error_buf);
1619 }
1620
1621 void udf_warning(struct super_block *sb, const char *function,
1622                  const char *fmt, ...)
1623 {
1624         va_list args;
1625
1626         va_start(args, fmt);
1627         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1628         va_end(args);
1629         printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
1630                sb->s_id, function, error_buf);
1631 }
1632
1633 /*
1634  * udf_put_super
1635  *
1636  * PURPOSE
1637  *      Prepare for destruction of the superblock.
1638  *
1639  * DESCRIPTION
1640  *      Called before the filesystem is unmounted.
1641  *
1642  * HISTORY
1643  *      July 1, 1997 - Andrew E. Mileski
1644  *      Written, tested, and released.
1645  */
1646 static void udf_put_super(struct super_block *sb)
1647 {
1648         int i;
1649
1650         if (UDF_SB_VAT(sb))
1651                 iput(UDF_SB_VAT(sb));
1652         if (UDF_SB_NUMPARTS(sb)) {
1653                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1654                         iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1655                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1656                         iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1657                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1658                         UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb), s_uspace);
1659                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1660                         UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb), s_fspace);
1661                 if (UDF_SB_PARTTYPE(sb, UDF_SB_PARTITION(sb)) == UDF_SPARABLE_MAP15) {
1662                         for (i = 0; i < 4; i++)
1663                                 brelse(UDF_SB_TYPESPAR(sb, UDF_SB_PARTITION(sb)).s_spar_map[i]);
1664                 }
1665         }
1666 #ifdef CONFIG_UDF_NLS
1667         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1668                 unload_nls(UDF_SB(sb)->s_nls_map);
1669 #endif
1670         if (!(sb->s_flags & MS_RDONLY))
1671                 udf_close_lvid(sb);
1672         brelse(UDF_SB_LVIDBH(sb));
1673         UDF_SB_FREE(sb);
1674         kfree(sb->s_fs_info);
1675         sb->s_fs_info = NULL;
1676 }
1677
1678 /*
1679  * udf_stat_fs
1680  *
1681  * PURPOSE
1682  *      Return info about the filesystem.
1683  *
1684  * DESCRIPTION
1685  *      Called by sys_statfs()
1686  *
1687  * HISTORY
1688  *      July 1, 1997 - Andrew E. Mileski
1689  *      Written, tested, and released.
1690  */
1691 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
1692 {
1693         struct super_block *sb = dentry->d_sb;
1694
1695         buf->f_type = UDF_SUPER_MAGIC;
1696         buf->f_bsize = sb->s_blocksize;
1697         buf->f_blocks = UDF_SB_PARTLEN(sb, UDF_SB_PARTITION(sb));
1698         buf->f_bfree = udf_count_free(sb);
1699         buf->f_bavail = buf->f_bfree;
1700         buf->f_files = (UDF_SB_LVIDBH(sb) ?
1701                         (le32_to_cpu(UDF_SB_LVIDIU(sb)->numFiles) +
1702                          le32_to_cpu(UDF_SB_LVIDIU(sb)->numDirs)) : 0) + buf->f_bfree;
1703         buf->f_ffree = buf->f_bfree;
1704         /* __kernel_fsid_t f_fsid */
1705         buf->f_namelen = UDF_NAME_LEN - 2;
1706
1707         return 0;
1708 }
1709
1710 static unsigned char udf_bitmap_lookup[16] = {
1711         0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4
1712 };
1713
1714 static unsigned int udf_count_free_bitmap(struct super_block *sb, struct udf_bitmap *bitmap)
1715 {
1716         struct buffer_head *bh = NULL;
1717         unsigned int accum = 0;
1718         int index;
1719         int block = 0, newblock;
1720         kernel_lb_addr loc;
1721         uint32_t bytes;
1722         uint8_t value;
1723         uint8_t *ptr;
1724         uint16_t ident;
1725         struct spaceBitmapDesc *bm;
1726
1727         lock_kernel();
1728
1729         loc.logicalBlockNum = bitmap->s_extPosition;
1730         loc.partitionReferenceNum = UDF_SB_PARTITION(sb);
1731         bh = udf_read_ptagged(sb, loc, 0, &ident);
1732
1733         if (!bh) {
1734                 printk(KERN_ERR "udf: udf_count_free failed\n");
1735                 goto out;
1736         } else if (ident != TAG_IDENT_SBD) {
1737                 brelse(bh);
1738                 printk(KERN_ERR "udf: udf_count_free failed\n");
1739                 goto out;
1740         }
1741
1742         bm = (struct spaceBitmapDesc *)bh->b_data;
1743         bytes = le32_to_cpu(bm->numOfBytes);
1744         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
1745         ptr = (uint8_t *)bh->b_data;
1746
1747         while (bytes > 0) {
1748                 while ((bytes > 0) && (index < sb->s_blocksize)) {
1749                         value = ptr[index];
1750                         accum += udf_bitmap_lookup[value & 0x0f];
1751                         accum += udf_bitmap_lookup[value >> 4];
1752                         index++;
1753                         bytes--;
1754                 }
1755                 if (bytes) {
1756                         brelse(bh);
1757                         newblock = udf_get_lb_pblock(sb, loc, ++block);
1758                         bh = udf_tread(sb, newblock);
1759                         if (!bh) {
1760                                 udf_debug("read failed\n");
1761                                 goto out;
1762                         }
1763                         index = 0;
1764                         ptr = (uint8_t *)bh->b_data;
1765                 }
1766         }
1767         brelse(bh);
1768
1769 out:
1770         unlock_kernel();
1771
1772         return accum;
1773 }
1774
1775 static unsigned int udf_count_free_table(struct super_block *sb, struct inode *table)
1776 {
1777         unsigned int accum = 0;
1778         uint32_t elen;
1779         kernel_lb_addr eloc;
1780         int8_t etype;
1781         struct extent_position epos;
1782
1783         lock_kernel();
1784
1785         epos.block = UDF_I_LOCATION(table);
1786         epos.offset = sizeof(struct unallocSpaceEntry);
1787         epos.bh = NULL;
1788
1789         while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1) {
1790                 accum += (elen >> table->i_sb->s_blocksize_bits);
1791         }
1792         brelse(epos.bh);
1793
1794         unlock_kernel();
1795
1796         return accum;
1797 }
1798
1799 static unsigned int udf_count_free(struct super_block *sb)
1800 {
1801         unsigned int accum = 0;
1802
1803         if (UDF_SB_LVIDBH(sb)) {
1804                 if (le32_to_cpu(UDF_SB_LVID(sb)->numOfPartitions) > UDF_SB_PARTITION(sb)) {
1805                         accum = le32_to_cpu(UDF_SB_LVID(sb)->freeSpaceTable[UDF_SB_PARTITION(sb)]);
1806                         if (accum == 0xFFFFFFFF)
1807                                 accum = 0;
1808                 }
1809         }
1810
1811         if (accum)
1812                 return accum;
1813
1814         if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP) {
1815                 accum += udf_count_free_bitmap(sb,
1816                                                UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_bitmap);
1817         }
1818         if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP) {
1819                 accum += udf_count_free_bitmap(sb,
1820                                                UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_bitmap);
1821         }
1822         if (accum)
1823                 return accum;
1824
1825         if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE) {
1826                 accum += udf_count_free_table(sb,
1827                                               UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1828         }
1829         if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE) {
1830                 accum += udf_count_free_table(sb,
1831                                               UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1832         }
1833
1834         return accum;
1835 }