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  * 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/config.h>
  44 #include <linux/blkdev.h>
  45 #include <linux/slab.h>
  46 #include <linux/kernel.h>
  47 #include <linux/module.h>
  48 #include <linux/parser.h>
  49 #include <linux/stat.h>
  50 #include <linux/cdrom.h>
  51 #include <linux/nls.h>
  52 #include <linux/smp_lock.h>
  53 #include <linux/buffer_head.h>
  54 #include <linux/vfs.h>
  55 #include <linux/vmalloc.h>
  56 #include <asm/byteorder.h>
  57
  58 #include <linux/udf_fs.h>
  59 #include "udf_sb.h"
  60 #include "udf_i.h"
  61
  62 #include <linux/init.h>
  63 #include <asm/uaccess.h>
  64
  65 #define VDS_POS_PRIMARY_VOL_DESC        0
  66 #define VDS_POS_UNALLOC_SPACE_DESC      1
  67 #define VDS_POS_LOGICAL_VOL_DESC        2
  68 #define VDS_POS_PARTITION_DESC          3
  69 #define VDS_POS_IMP_USE_VOL_DESC        4
  70 #define VDS_POS_VOL_DESC_PTR            5
  71 #define VDS_POS_TERMINATING_DESC        6
  72 #define VDS_POS_LENGTH                  7
  73
  74 static char error_buf[1024];
  75
  76 /* These are the "meat" - everything else is stuffing */
  77 static int udf_fill_super(struct super_block *, void *, int);
  78 static void udf_put_super(struct super_block *);
  79 static void udf_write_super(struct super_block *);
  80 static int udf_remount_fs(struct super_block *, int *, char *);
  81 static int udf_check_valid(struct super_block *, int, int);
  82 static int udf_vrs(struct super_block *sb, int silent);
  83 static int udf_load_partition(struct super_block *, kernel_lb_addr *);
  84 static int udf_load_logicalvol(struct super_block *, struct buffer_head *, 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 *, kernel_lb_addr *);
  88 static void udf_load_pvoldesc(struct super_block *, struct buffer_head *);
  89 static void udf_load_fileset(struct super_block *, struct buffer_head *, kernel_lb_addr *);
  90 static void udf_load_partdesc(struct super_block *, struct buffer_head *);
  91 static void udf_open_lvid(struct super_block *);
  92 static void udf_close_lvid(struct super_block *);
  93 static unsigned int udf_count_free(struct super_block *);
  94 static int udf_statfs(struct dentry *, struct kstatfs *);
  95
  96 /* UDF filesystem type */
  97 static int udf_get_sb(struct file_system_type *fs_type,
  98         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
  99 {
 100         return get_sb_bdev(fs_type, flags, dev_name, data, udf_fill_super, mnt);
 101 }
 102
 103 static struct file_system_type udf_fstype = {
 104         .owner          = THIS_MODULE,
 105         .name           = "udf",
 106         .get_sb         = udf_get_sb,
 107         .kill_sb        = kill_block_super,
 108         .fs_flags       = FS_REQUIRES_DEV,
 109 };
 110
 111 static kmem_cache_t * udf_inode_cachep;
 112
 113 static struct inode *udf_alloc_inode(struct super_block *sb)
 114 {
 115         struct udf_inode_info *ei;
 116         ei = (struct udf_inode_info *)kmem_cache_alloc(udf_inode_cachep, SLAB_KERNEL);
 117         if (!ei)
 118                 return NULL;
 119         return &ei->vfs_inode;
 120 }
 121
 122 static void udf_destroy_inode(struct inode *inode)
 123 {
 124         kmem_cache_free(udf_inode_cachep, UDF_I(inode));
 125 }
 126
 127 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
 128 {
 129         struct udf_inode_info *ei = (struct udf_inode_info *) foo;
 130
 131         if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
 132             SLAB_CTOR_CONSTRUCTOR)
 133         {
 134                 ei->i_ext.i_data = NULL;
 135                 inode_init_once(&ei->vfs_inode);
 136         }
 137 }
 138
 139 static int init_inodecache(void)
 140 {
 141         udf_inode_cachep = kmem_cache_create("udf_inode_cache",
 142                                              sizeof(struct udf_inode_info),
 143                                              0, (SLAB_RECLAIM_ACCOUNT|
 144                                                 SLAB_MEM_SPREAD),
 145                                              init_once, NULL);
 146         if (udf_inode_cachep == NULL)
 147                 return -ENOMEM;
 148         return 0;
 149 }
 150
 151 static void destroy_inodecache(void)
 152 {
 153         if (kmem_cache_destroy(udf_inode_cachep))
 154                 printk(KERN_INFO "udf_inode_cache: not all structures were freed\n");
 155 }
 156
 157 /* Superblock operations */
 158 static struct super_operations udf_sb_ops = {
 159         .alloc_inode            = udf_alloc_inode,
 160         .destroy_inode          = udf_destroy_inode,
 161         .write_inode            = udf_write_inode,
 162         .delete_inode           = udf_delete_inode,
 163         .clear_inode            = udf_clear_inode,
 164         .put_super              = udf_put_super,
 165         .write_super            = udf_write_super,
 166         .statfs                 = udf_statfs,
 167         .remount_fs             = udf_remount_fs,
 168 };
 169
 170 struct udf_options
 171 {
 172         unsigned char novrs;
 173         unsigned int blocksize;
 174         unsigned int session;
 175         unsigned int lastblock;
 176         unsigned int anchor;
 177         unsigned int volume;
 178         unsigned short partition;
 179         unsigned int fileset;
 180         unsigned int rootdir;
 181         unsigned int flags;
 182         mode_t umask;
 183         gid_t gid;
 184         uid_t uid;
 185         struct nls_table *nls_map;
 186 };
 187
 188 static int __init init_udf_fs(void)
 189 {
 190         int err;
 191         err = init_inodecache();
 192         if (err)
 193                 goto out1;
 194         err = register_filesystem(&udf_fstype);
 195         if (err)
 196                 goto out;
 197         return 0;
 198 out:
 199         destroy_inodecache();
 200 out1:
 201         return err;
 202 }
 203
 204 static void __exit exit_udf_fs(void)
 205 {
 206         unregister_filesystem(&udf_fstype);
 207         destroy_inodecache();
 208 }
 209
 210 module_init(init_udf_fs)
 211 module_exit(exit_udf_fs)
 212
 213 /*
 214  * udf_parse_options
 215  *
 216  * PURPOSE
 217  *      Parse mount options.
 218  *
 219  * DESCRIPTION
 220  *      The following mount options are supported:
 221  *
 222  *      gid=            Set the default group.
 223  *      umask=          Set the default umask.
 224  *      uid=            Set the default user.
 225  *      bs=             Set the block size.
 226  *      unhide          Show otherwise hidden files.
 227  *      undelete        Show deleted files in lists.
 228  *      adinicb         Embed data in the inode (default)
 229  *      noadinicb       Don't embed data in the inode
 230  *      shortad         Use short ad's
 231  *      longad          Use long ad's (default)
 232  *      nostrict        Unset strict conformance
 233  *      iocharset=      Set the NLS character set
 234  *
 235  *      The remaining are for debugging and disaster recovery:
 236  *
 237  *      novrs           Skip volume sequence recognition
 238  *
 239  *      The following expect a offset from 0.
 240  *
 241  *      session=        Set the CDROM session (default= last session)
 242  *      anchor=         Override standard anchor location. (default= 256)
 243  *      volume=         Override the VolumeDesc location. (unused)
 244  *      partition=      Override the PartitionDesc location. (unused)
 245  *      lastblock=      Set the last block of the filesystem/
 246  *
 247  *      The following expect a offset from the partition root.
 248  *
 249  *      fileset=        Override the fileset block location. (unused)
 250  *      rootdir=        Override the root directory location. (unused)
 251  *              WARNING: overriding the rootdir to a non-directory may
 252  *              yield highly unpredictable results.
 253  *
 254  * PRE-CONDITIONS
 255  *      options         Pointer to mount options string.
 256  *      uopts           Pointer to mount options variable.
 257  *
 258  * POST-CONDITIONS
 259  *      <return>        1       Mount options parsed okay.
 260  *      <return>        0       Error parsing mount options.
 261  *
 262  * HISTORY
 263  *      July 1, 1997 - Andrew E. Mileski
 264  *      Written, tested, and released.
 265  */
 266
 267 enum {
 268         Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
 269         Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
 270         Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
 271         Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
 272         Opt_rootdir, Opt_utf8, Opt_iocharset,
 273         Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore
 274 };
 275
 276 static match_table_t tokens = {
 277         {Opt_novrs, "novrs"},
 278         {Opt_nostrict, "nostrict"},
 279         {Opt_bs, "bs=%u"},
 280         {Opt_unhide, "unhide"},
 281         {Opt_undelete, "undelete"},
 282         {Opt_noadinicb, "noadinicb"},
 283         {Opt_adinicb, "adinicb"},
 284         {Opt_shortad, "shortad"},
 285         {Opt_longad, "longad"},
 286         {Opt_uforget, "uid=forget"},
 287         {Opt_uignore, "uid=ignore"},
 288         {Opt_gforget, "gid=forget"},
 289         {Opt_gignore, "gid=ignore"},
 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                         case Opt_uignore:
 423                                 uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
 424                                 break;
 425                         case Opt_uforget:
 426                                 uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
 427                                 break;
 428                         case Opt_gignore:
 429                             uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
 430                                 break;
 431                         case Opt_gforget:
 432                             uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
 433                                 break;
 434                         default:
 435                                 printk(KERN_ERR "udf: bad mount option \"%s\" "
 436                                                 "or missing value\n", p);
 437                         return 0;
 438                 }
 439         }
 440         return 1;
 441 }
 442
 443 void
 444 udf_write_super(struct super_block *sb)
 445 {
 446         lock_kernel();
 447         if (!(sb->s_flags & MS_RDONLY))
 448                 udf_open_lvid(sb);
 449         sb->s_dirt = 0;
 450         unlock_kernel();
 451 }
 452
 453 static int
 454 udf_remount_fs(struct super_block *sb, int *flags, char *options)
 455 {
 456         struct udf_options uopt;
 457
 458         uopt.flags = UDF_SB(sb)->s_flags ;
 459         uopt.uid   = UDF_SB(sb)->s_uid ;
 460         uopt.gid   = UDF_SB(sb)->s_gid ;
 461         uopt.umask = UDF_SB(sb)->s_umask ;
 462
 463         if ( !udf_parse_options(options, &uopt) )
 464                 return -EINVAL;
 465
 466         UDF_SB(sb)->s_flags = uopt.flags;
 467         UDF_SB(sb)->s_uid   = uopt.uid;
 468         UDF_SB(sb)->s_gid   = uopt.gid;
 469         UDF_SB(sb)->s_umask = uopt.umask;
 470
 471         if (UDF_SB_LVIDBH(sb)) {
 472                 int write_rev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev);
 473                 if (write_rev > UDF_MAX_WRITE_VERSION)
 474                         *flags |= MS_RDONLY;
 475         }
 476
 477         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 478                 return 0;
 479         if (*flags & MS_RDONLY)
 480                 udf_close_lvid(sb);
 481         else
 482                 udf_open_lvid(sb);
 483
 484         return 0;
 485 }
 486
 487 /*
 488  * udf_set_blocksize
 489  *
 490  * PURPOSE
 491  *      Set the block size to be used in all transfers.
 492  *
 493  * DESCRIPTION
 494  *      To allow room for a DMA transfer, it is best to guess big when unsure.
 495  *      This routine picks 2048 bytes as the blocksize when guessing. This
 496  *      should be adequate until devices with larger block sizes become common.
 497  *
 498  *      Note that the Linux kernel can currently only deal with blocksizes of
 499  *      512, 1024, 2048, 4096, and 8192 bytes.
 500  *
 501  * PRE-CONDITIONS
 502  *      sb                      Pointer to _locked_ superblock.
 503  *
 504  * POST-CONDITIONS
 505  *      sb->s_blocksize         Blocksize.
 506  *      sb->s_blocksize_bits    log2 of blocksize.
 507  *      <return>        0       Blocksize is valid.
 508  *      <return>        1       Blocksize is invalid.
 509  *
 510  * HISTORY
 511  *      July 1, 1997 - Andrew E. Mileski
 512  *      Written, tested, and released.
 513  */
 514 static  int
 515 udf_set_blocksize(struct super_block *sb, int bsize)
 516 {
 517         if (!sb_min_blocksize(sb, bsize)) {
 518                 udf_debug("Bad block size (%d)\n", bsize);
 519                 printk(KERN_ERR "udf: bad block size (%d)\n", bsize);
 520                 return 0;
 521         }
 522         return sb->s_blocksize;
 523 }
 524
 525 static int
 526 udf_vrs(struct super_block *sb, int silent)
 527 {
 528         struct volStructDesc *vsd = NULL;
 529         int sector = 32768;
 530         int sectorsize;
 531         struct buffer_head *bh = NULL;
 532         int iso9660=0;
 533         int nsr02=0;
 534         int nsr03=0;
 535
 536         /* Block size must be a multiple of 512 */
 537         if (sb->s_blocksize & 511)
 538                 return 0;
 539
 540         if (sb->s_blocksize < sizeof(struct volStructDesc))
 541                 sectorsize = sizeof(struct volStructDesc);
 542         else
 543                 sectorsize = sb->s_blocksize;
 544
 545         sector += (UDF_SB_SESSION(sb) << sb->s_blocksize_bits);
 546
 547         udf_debug("Starting at sector %u (%ld byte sectors)\n",
 548                 (sector >> sb->s_blocksize_bits), sb->s_blocksize);
 549         /* Process the sequence (if applicable) */
 550         for (;!nsr02 && !nsr03; sector += sectorsize)
 551         {
 552                 /* Read a block */
 553                 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
 554                 if (!bh)
 555                         break;
 556
 557                 /* Look for ISO  descriptors */
 558                 vsd = (struct volStructDesc *)(bh->b_data +
 559                         (sector & (sb->s_blocksize - 1)));
 560
 561                 if (vsd->stdIdent[0] == 0)
 562                 {
 563                         udf_release_data(bh);
 564                         break;
 565                 }
 566                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001, VSD_STD_ID_LEN))
 567                 {
 568                         iso9660 = sector;
 569                         switch (vsd->structType)
 570                         {
 571                                 case 0:
 572                                         udf_debug("ISO9660 Boot Record found\n");
 573                                         break;
 574                                 case 1:
 575                                         udf_debug("ISO9660 Primary Volume Descriptor found\n");
 576                                         break;
 577                                 case 2:
 578                                         udf_debug("ISO9660 Supplementary Volume Descriptor found\n");
 579                                         break;
 580                                 case 3:
 581                                         udf_debug("ISO9660 Volume Partition Descriptor found\n");
 582                                         break;
 583                                 case 255:
 584                                         udf_debug("ISO9660 Volume Descriptor Set Terminator found\n");
 585                                         break;
 586                                 default:
 587                                         udf_debug("ISO9660 VRS (%u) found\n", vsd->structType);
 588                                         break;
 589                         }
 590                 }
 591                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01, VSD_STD_ID_LEN))
 592                 {
 593                 }
 594                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01, VSD_STD_ID_LEN))
 595                 {
 596                         udf_release_data(bh);
 597                         break;
 598                 }
 599                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02, VSD_STD_ID_LEN))
 600                 {
 601                         nsr02 = sector;
 602                 }
 603                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03, VSD_STD_ID_LEN))
 604                 {
 605                         nsr03 = sector;
 606                 }
 607                 udf_release_data(bh);
 608         }
 609
 610         if (nsr03)
 611                 return nsr03;
 612         else if (nsr02)
 613                 return nsr02;
 614         else if (sector - (UDF_SB_SESSION(sb) << sb->s_blocksize_bits) == 32768)
 615                 return -1;
 616         else
 617                 return 0;
 618 }
 619
 620 /*
 621  * udf_find_anchor
 622  *
 623  * PURPOSE
 624  *      Find an anchor volume descriptor.
 625  *
 626  * PRE-CONDITIONS
 627  *      sb                      Pointer to _locked_ superblock.
 628  *      lastblock               Last block on media.
 629  *
 630  * POST-CONDITIONS
 631  *      <return>                1 if not found, 0 if ok
 632  *
 633  * HISTORY
 634  *      July 1, 1997 - Andrew E. Mileski
 635  *      Written, tested, and released.
 636  */
 637 static void
 638 udf_find_anchor(struct super_block *sb)
 639 {
 640         int lastblock = UDF_SB_LASTBLOCK(sb);
 641         struct buffer_head *bh = NULL;
 642         uint16_t ident;
 643         uint32_t location;
 644         int i;
 645
 646         if (lastblock)
 647         {
 648                 int varlastblock = udf_variable_to_fixed(lastblock);
 649                 int last[] =  { lastblock, lastblock - 2,
 650                                 lastblock - 150, lastblock - 152,
 651                                 varlastblock, varlastblock - 2,
 652                                 varlastblock - 150, varlastblock - 152 };
 653
 654                 lastblock = 0;
 655
 656                 /* Search for an anchor volume descriptor pointer */
 657
 658                 /*  according to spec, anchor is in either:
 659                  *     block 256
 660                  *     lastblock-256
 661                  *     lastblock
 662                  *  however, if the disc isn't closed, it could be 512 */
 663
 664                 for (i = 0; !lastblock && i < ARRAY_SIZE(last); i++) {
 665                         if (last[i] < 0 || !(bh = sb_bread(sb, last[i])))
 666                         {
 667                                 ident = location = 0;
 668                         }
 669                         else
 670                         {
 671                                 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
 672                                 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
 673                                 udf_release_data(bh);
 674                         }
 675
 676                         if (ident == TAG_IDENT_AVDP)
 677                         {
 678                                 if (location == last[i] - UDF_SB_SESSION(sb))
 679                                 {
 680                                         lastblock = UDF_SB_ANCHOR(sb)[0] = last[i] - UDF_SB_SESSION(sb);
 681                                         UDF_SB_ANCHOR(sb)[1] = last[i] - 256 - UDF_SB_SESSION(sb);
 682                                 }
 683                                 else if (location == udf_variable_to_fixed(last[i]) - UDF_SB_SESSION(sb))
 684                                 {
 685                                         UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
 686                                         lastblock = UDF_SB_ANCHOR(sb)[0] = udf_variable_to_fixed(last[i]) - UDF_SB_SESSION(sb);
 687                                         UDF_SB_ANCHOR(sb)[1] = lastblock - 256 - UDF_SB_SESSION(sb);
 688                                 }
 689                                 else
 690                                         udf_debug("Anchor found at block %d, location mismatch %d.\n",
 691                                                 last[i], location);
 692                         }
 693                         else if (ident == TAG_IDENT_FE || ident == TAG_IDENT_EFE)
 694                         {
 695                                 lastblock = last[i];
 696                                 UDF_SB_ANCHOR(sb)[3] = 512;
 697                         }
 698                         else
 699                         {
 700                                 if (last[i] < 256 || !(bh = sb_bread(sb, last[i] - 256)))
 701                                 {
 702                                         ident = location = 0;
 703                                 }
 704                                 else
 705                                 {
 706                                         ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
 707                                         location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
 708                                         udf_release_data(bh);
 709                                 }
 710
 711                                 if (ident == TAG_IDENT_AVDP &&
 712                                         location == last[i] - 256 - UDF_SB_SESSION(sb))
 713                                 {
 714                                         lastblock = last[i];
 715                                         UDF_SB_ANCHOR(sb)[1] = last[i] - 256;
 716                                 }
 717                                 else
 718                                 {
 719                                         if (last[i] < 312 + UDF_SB_SESSION(sb) || !(bh = sb_bread(sb, last[i] - 312 - UDF_SB_SESSION(sb))))
 720                                         {
 721                                                 ident = location = 0;
 722                                         }
 723                                         else
 724                                         {
 725                                                 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
 726                                                 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
 727                                                 udf_release_data(bh);
 728                                         }
 729
 730                                         if (ident == TAG_IDENT_AVDP &&
 731                                                 location == udf_variable_to_fixed(last[i]) - 256)
 732                                         {
 733                                                 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
 734                                                 lastblock = udf_variable_to_fixed(last[i]);
 735                                                 UDF_SB_ANCHOR(sb)[1] = lastblock - 256;
 736                                         }
 737                                 }
 738                         }
 739                 }
 740         }
 741
 742         if (!lastblock)
 743         {
 744                 /* We havn't found the lastblock. check 312 */
 745                 if ((bh = sb_bread(sb, 312 + UDF_SB_SESSION(sb))))
 746                 {
 747                         ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
 748                         location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
 749                         udf_release_data(bh);
 750
 751                         if (ident == TAG_IDENT_AVDP && location == 256)
 752                                 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
 753                 }
 754         }
 755
 756         for (i = 0; i < ARRAY_SIZE(UDF_SB_ANCHOR(sb)); i++) {
 757                 if (UDF_SB_ANCHOR(sb)[i])
 758                 {
 759                         if (!(bh = udf_read_tagged(sb,
 760                                 UDF_SB_ANCHOR(sb)[i], UDF_SB_ANCHOR(sb)[i], &ident)))
 761                         {
 762                                 UDF_SB_ANCHOR(sb)[i] = 0;
 763                         }
 764                         else
 765                         {
 766                                 udf_release_data(bh);
 767                                 if ((ident != TAG_IDENT_AVDP) && (i ||
 768                                         (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE)))
 769                                 {
 770                                         UDF_SB_ANCHOR(sb)[i] = 0;
 771                                 }
 772                         }
 773                 }
 774         }
 775
 776         UDF_SB_LASTBLOCK(sb) = lastblock;
 777 }
 778
 779 static int
 780 udf_find_fileset(struct super_block *sb, kernel_lb_addr *fileset, kernel_lb_addr *root)
 781 {
 782         struct buffer_head *bh = NULL;
 783         long lastblock;
 784         uint16_t ident;
 785
 786         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
 787                 fileset->partitionReferenceNum != 0xFFFF)
 788         {
 789                 bh = udf_read_ptagged(sb, *fileset, 0, &ident);
 790
 791                 if (!bh)
 792                         return 1;
 793                 else if (ident != TAG_IDENT_FSD)
 794                 {
 795                         udf_release_data(bh);
 796                         return 1;
 797                 }
 798
 799         }
 800
 801         if (!bh) /* Search backwards through the partitions */
 802         {
 803                 kernel_lb_addr newfileset;
 804
 805                 return 1;
 806
 807                 for (newfileset.partitionReferenceNum=UDF_SB_NUMPARTS(sb)-1;
 808                         (newfileset.partitionReferenceNum != 0xFFFF &&
 809                                 fileset->logicalBlockNum == 0xFFFFFFFF &&
 810                                 fileset->partitionReferenceNum == 0xFFFF);
 811                         newfileset.partitionReferenceNum--)
 812                 {
 813                         lastblock = UDF_SB_PARTLEN(sb, newfileset.partitionReferenceNum);
 814                         newfileset.logicalBlockNum = 0;
 815
 816                         do
 817                         {
 818                                 bh = udf_read_ptagged(sb, newfileset, 0, &ident);
 819                                 if (!bh)
 820                                 {
 821                                         newfileset.logicalBlockNum ++;
 822                                         continue;
 823                                 }
 824
 825                                 switch (ident)
 826                                 {
 827                                         case TAG_IDENT_SBD:
 828                                         {
 829                                                 struct spaceBitmapDesc *sp;
 830                                                 sp = (struct spaceBitmapDesc *)bh->b_data;
 831                                                 newfileset.logicalBlockNum += 1 +
 832                                                         ((le32_to_cpu(sp->numOfBytes) + sizeof(struct spaceBitmapDesc) - 1)
 833                                                                 >> sb->s_blocksize_bits);
 834                                                 udf_release_data(bh);
 835                                                 break;
 836                                         }
 837                                         case TAG_IDENT_FSD:
 838                                         {
 839                                                 *fileset = newfileset;
 840                                                 break;
 841                                         }
 842                                         default:
 843                                         {
 844                                                 newfileset.logicalBlockNum ++;
 845                                                 udf_release_data(bh);
 846                                                 bh = NULL;
 847                                                 break;
 848                                         }
 849                                 }
 850                         }
 851                         while (newfileset.logicalBlockNum < lastblock &&
 852                                 fileset->logicalBlockNum == 0xFFFFFFFF &&
 853                                 fileset->partitionReferenceNum == 0xFFFF);
 854                 }
 855         }
 856
 857         if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
 858                 fileset->partitionReferenceNum != 0xFFFF) && bh)
 859         {
 860                 udf_debug("Fileset at block=%d, partition=%d\n",
 861                         fileset->logicalBlockNum, fileset->partitionReferenceNum);
 862
 863                 UDF_SB_PARTITION(sb) = fileset->partitionReferenceNum;
 864                 udf_load_fileset(sb, bh, root);
 865                 udf_release_data(bh);
 866                 return 0;
 867         }
 868         return 1;
 869 }
 870
 871 static void
 872 udf_load_pvoldesc(struct super_block *sb, struct buffer_head *bh)
 873 {
 874         struct primaryVolDesc *pvoldesc;
 875         time_t recording;
 876         long recording_usec;
 877         struct ustr instr;
 878         struct ustr outstr;
 879
 880         pvoldesc = (struct primaryVolDesc *)bh->b_data;
 881
 882         if ( udf_stamp_to_time(&recording, &recording_usec,
 883                 lets_to_cpu(pvoldesc->recordingDateAndTime)) )
 884         {
 885                 kernel_timestamp ts;
 886                 ts = lets_to_cpu(pvoldesc->recordingDateAndTime);
 887                 udf_debug("recording time %ld/%ld, %04u/%02u/%02u %02u:%02u (%x)\n",
 888                         recording, recording_usec,
 889                         ts.year, ts.month, ts.day, ts.hour, ts.minute, ts.typeAndTimezone);
 890                 UDF_SB_RECORDTIME(sb).tv_sec = recording;
 891                 UDF_SB_RECORDTIME(sb).tv_nsec = recording_usec * 1000;
 892         }
 893
 894         if ( !udf_build_ustr(&instr, pvoldesc->volIdent, 32) )
 895         {
 896                 if (udf_CS0toUTF8(&outstr, &instr))
 897                 {
 898                         strncpy( UDF_SB_VOLIDENT(sb), outstr.u_name,
 899                                 outstr.u_len > 31 ? 31 : outstr.u_len);
 900                         udf_debug("volIdent[] = '%s'\n", UDF_SB_VOLIDENT(sb));
 901                 }
 902         }
 903
 904         if ( !udf_build_ustr(&instr, pvoldesc->volSetIdent, 128) )
 905         {
 906                 if (udf_CS0toUTF8(&outstr, &instr))
 907                         udf_debug("volSetIdent[] = '%s'\n", outstr.u_name);
 908         }
 909 }
 910
 911 static void
 912 udf_load_fileset(struct super_block *sb, struct buffer_head *bh, kernel_lb_addr *root)
 913 {
 914         struct fileSetDesc *fset;
 915
 916         fset = (struct fileSetDesc *)bh->b_data;
 917
 918         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
 919
 920         UDF_SB_SERIALNUM(sb) = le16_to_cpu(fset->descTag.tagSerialNum);
 921
 922         udf_debug("Rootdir at block=%d, partition=%d\n",
 923                 root->logicalBlockNum, root->partitionReferenceNum);
 924 }
 925
 926 static void
 927 udf_load_partdesc(struct super_block *sb, struct buffer_head *bh)
 928 {
 929         struct partitionDesc *p;
 930         int i;
 931
 932         p = (struct partitionDesc *)bh->b_data;
 933
 934         for (i=0; i<UDF_SB_NUMPARTS(sb); i++)
 935         {
 936                 udf_debug("Searching map: (%d == %d)\n",
 937                         UDF_SB_PARTMAPS(sb)[i].s_partition_num, le16_to_cpu(p->partitionNumber));
 938                 if (UDF_SB_PARTMAPS(sb)[i].s_partition_num == le16_to_cpu(p->partitionNumber))
 939                 {
 940                         UDF_SB_PARTLEN(sb,i) = le32_to_cpu(p->partitionLength); /* blocks */
 941                         UDF_SB_PARTROOT(sb,i) = le32_to_cpu(p->partitionStartingLocation);
 942                         if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_READ_ONLY)
 943                                 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_READ_ONLY;
 944                         if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_WRITE_ONCE)
 945                                 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_WRITE_ONCE;
 946                         if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_REWRITABLE)
 947                                 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_REWRITABLE;
 948                         if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_OVERWRITABLE)
 949                                 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_OVERWRITABLE;
 950
 951                         if (!strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) ||
 952                                 !strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
 953                         {
 954                                 struct partitionHeaderDesc *phd;
 955
 956                                 phd = (struct partitionHeaderDesc *)(p->partitionContentsUse);
 957                                 if (phd->unallocSpaceTable.extLength)
 958                                 {
 959                                         kernel_lb_addr loc = { le32_to_cpu(phd->unallocSpaceTable.extPosition), i };
 960
 961                                         UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table =
 962                                                 udf_iget(sb, loc);
 963                                         UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_UNALLOC_TABLE;
 964                                         udf_debug("unallocSpaceTable (part %d) @ %ld\n",
 965                                                 i, UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table->i_ino);
 966                                 }
 967                                 if (phd->unallocSpaceBitmap.extLength)
 968                                 {
 969                                         UDF_SB_ALLOC_BITMAP(sb, i, s_uspace);
 970                                         if (UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap != NULL)
 971                                         {
 972                                                 UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extLength =
 973                                                         le32_to_cpu(phd->unallocSpaceBitmap.extLength);
 974                                                 UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extPosition =
 975                                                         le32_to_cpu(phd->unallocSpaceBitmap.extPosition);
 976                                                 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_UNALLOC_BITMAP;
 977                                                 udf_debug("unallocSpaceBitmap (part %d) @ %d\n",
 978                                                         i, UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extPosition);
 979                                         }
 980                                 }
 981                                 if (phd->partitionIntegrityTable.extLength)
 982                                         udf_debug("partitionIntegrityTable (part %d)\n", i);
 983                                 if (phd->freedSpaceTable.extLength)
 984                                 {
 985                                         kernel_lb_addr loc = { le32_to_cpu(phd->freedSpaceTable.extPosition), i };
 986
 987                                         UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table =
 988                                                 udf_iget(sb, loc);
 989                                         UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_FREED_TABLE;
 990                                         udf_debug("freedSpaceTable (part %d) @ %ld\n",
 991                                                 i, UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table->i_ino);
 992                                 }
 993                                 if (phd->freedSpaceBitmap.extLength)
 994                                 {
 995                                         UDF_SB_ALLOC_BITMAP(sb, i, s_fspace);
 996                                         if (UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap != NULL)
 997                                         {
 998                                                 UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extLength =
 999                                                         le32_to_cpu(phd->freedSpaceBitmap.extLength);
1000                                                 UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extPosition =
1001                                                         le32_to_cpu(phd->freedSpaceBitmap.extPosition);
1002                                                 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_FREED_BITMAP;
1003                                                 udf_debug("freedSpaceBitmap (part %d) @ %d\n",
1004                                                         i, UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extPosition);
1005                                         }
1006                                 }
1007                         }
1008                         break;
1009                 }
1010         }
1011         if (i == UDF_SB_NUMPARTS(sb))
1012         {
1013                 udf_debug("Partition (%d) not found in partition map\n", le16_to_cpu(p->partitionNumber));
1014         }
1015         else
1016         {
1017                 udf_debug("Partition (%d:%d type %x) starts at physical %d, block length %d\n",
1018                         le16_to_cpu(p->partitionNumber), i, UDF_SB_PARTTYPE(sb,i),
1019                         UDF_SB_PARTROOT(sb,i), UDF_SB_PARTLEN(sb,i));
1020         }
1021 }
1022
1023 static int
1024 udf_load_logicalvol(struct super_block *sb, struct buffer_head * bh, kernel_lb_addr *fileset)
1025 {
1026         struct logicalVolDesc *lvd;
1027         int i, j, offset;
1028         uint8_t type;
1029
1030         lvd = (struct logicalVolDesc *)bh->b_data;
1031
1032         UDF_SB_ALLOC_PARTMAPS(sb, le32_to_cpu(lvd->numPartitionMaps));
1033
1034         for (i=0,offset=0;
1035                  i<UDF_SB_NUMPARTS(sb) && offset<le32_to_cpu(lvd->mapTableLength);
1036                  i++,offset+=((struct genericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapLength)
1037         {
1038                 type = ((struct genericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapType;
1039                 if (type == 1)
1040                 {
1041                         struct genericPartitionMap1 *gpm1 = (struct genericPartitionMap1 *)&(lvd->partitionMaps[offset]);
1042                         UDF_SB_PARTTYPE(sb,i) = UDF_TYPE1_MAP15;
1043                         UDF_SB_PARTVSN(sb,i) = le16_to_cpu(gpm1->volSeqNum);
1044                         UDF_SB_PARTNUM(sb,i) = le16_to_cpu(gpm1->partitionNum);
1045                         UDF_SB_PARTFUNC(sb,i) = NULL;
1046                 }
1047                 else if (type == 2)
1048                 {
1049                         struct udfPartitionMap2 *upm2 = (struct udfPartitionMap2 *)&(lvd->partitionMaps[offset]);
1050                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL, strlen(UDF_ID_VIRTUAL)))
1051                         {
1052                                 if (le16_to_cpu(((__le16 *)upm2->partIdent.identSuffix)[0]) == 0x0150)
1053                                 {
1054                                         UDF_SB_PARTTYPE(sb,i) = UDF_VIRTUAL_MAP15;
1055                                         UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_virt15;
1056                                 }
1057                                 else if (le16_to_cpu(((__le16 *)upm2->partIdent.identSuffix)[0]) == 0x0200)
1058                                 {
1059                                         UDF_SB_PARTTYPE(sb,i) = UDF_VIRTUAL_MAP20;
1060                                         UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_virt20;
1061                                 }
1062                         }
1063                         else if (!strncmp(upm2->partIdent.ident, UDF_ID_SPARABLE, strlen(UDF_ID_SPARABLE)))
1064                         {
1065                                 uint32_t loc;
1066                                 uint16_t ident;
1067                                 struct sparingTable *st;
1068                                 struct sparablePartitionMap *spm = (struct sparablePartitionMap *)&(lvd->partitionMaps[offset]);
1069
1070                                 UDF_SB_PARTTYPE(sb,i) = UDF_SPARABLE_MAP15;
1071                                 UDF_SB_TYPESPAR(sb,i).s_packet_len = le16_to_cpu(spm->packetLength);
1072                                 for (j=0; j<spm->numSparingTables; j++)
1073                                 {
1074                                         loc = le32_to_cpu(spm->locSparingTable[j]);
1075                                         UDF_SB_TYPESPAR(sb,i).s_spar_map[j] =
1076                                                 udf_read_tagged(sb, loc, loc, &ident);
1077                                         if (UDF_SB_TYPESPAR(sb,i).s_spar_map[j] != NULL)
1078                                         {
1079                                                 st = (struct sparingTable *)UDF_SB_TYPESPAR(sb,i).s_spar_map[j]->b_data;
1080                                                 if (ident != 0 ||
1081                                                         strncmp(st->sparingIdent.ident, UDF_ID_SPARING, strlen(UDF_ID_SPARING)))
1082                                                 {
1083                                                         udf_release_data(UDF_SB_TYPESPAR(sb,i).s_spar_map[j]);
1084                                                         UDF_SB_TYPESPAR(sb,i).s_spar_map[j] = NULL;
1085                                                 }
1086                                         }
1087                                 }
1088                                 UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_spar15;
1089                         }
1090                         else
1091                         {
1092                                 udf_debug("Unknown ident: %s\n", upm2->partIdent.ident);
1093                                 continue;
1094                         }
1095                         UDF_SB_PARTVSN(sb,i) = le16_to_cpu(upm2->volSeqNum);
1096                         UDF_SB_PARTNUM(sb,i) = le16_to_cpu(upm2->partitionNum);
1097                 }
1098                 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1099                         i, UDF_SB_PARTNUM(sb,i), type, UDF_SB_PARTVSN(sb,i));
1100         }
1101
1102         if (fileset)
1103         {
1104                 long_ad *la = (long_ad *)&(lvd->logicalVolContentsUse[0]);
1105
1106                 *fileset = lelb_to_cpu(la->extLocation);
1107                 udf_debug("FileSet found in LogicalVolDesc at block=%d, partition=%d\n",
1108                         fileset->logicalBlockNum,
1109                         fileset->partitionReferenceNum);
1110         }
1111         if (lvd->integritySeqExt.extLength)
1112                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1113         return 0;
1114 }
1115
1116 /*
1117  * udf_load_logicalvolint
1118  *
1119  */
1120 static void
1121 udf_load_logicalvolint(struct super_block *sb, kernel_extent_ad loc)
1122 {
1123         struct buffer_head *bh = NULL;
1124         uint16_t ident;
1125
1126         while (loc.extLength > 0 &&
1127                 (bh = udf_read_tagged(sb, loc.extLocation,
1128                         loc.extLocation, &ident)) &&
1129                 ident == TAG_IDENT_LVID)
1130         {
1131                 UDF_SB_LVIDBH(sb) = bh;
1132
1133                 if (UDF_SB_LVID(sb)->nextIntegrityExt.extLength)
1134                         udf_load_logicalvolint(sb, leea_to_cpu(UDF_SB_LVID(sb)->nextIntegrityExt));
1135
1136                 if (UDF_SB_LVIDBH(sb) != bh)
1137                         udf_release_data(bh);
1138                 loc.extLength -= sb->s_blocksize;
1139                 loc.extLocation ++;
1140         }
1141         if (UDF_SB_LVIDBH(sb) != bh)
1142                 udf_release_data(bh);
1143 }
1144
1145 /*
1146  * udf_process_sequence
1147  *
1148  * PURPOSE
1149  *      Process a main/reserve volume descriptor sequence.
1150  *
1151  * PRE-CONDITIONS
1152  *      sb                      Pointer to _locked_ superblock.
1153  *      block                   First block of first extent of the sequence.
1154  *      lastblock               Lastblock of first extent of the sequence.
1155  *
1156  * HISTORY
1157  *      July 1, 1997 - Andrew E. Mileski
1158  *      Written, tested, and released.
1159  */
1160 static  int
1161 udf_process_sequence(struct super_block *sb, long block, long lastblock, kernel_lb_addr *fileset)
1162 {
1163         struct buffer_head *bh = NULL;
1164         struct udf_vds_record vds[VDS_POS_LENGTH];
1165         struct generic_desc *gd;
1166         struct volDescPtr *vdp;
1167         int done=0;
1168         int i,j;
1169         uint32_t vdsn;
1170         uint16_t ident;
1171         long next_s = 0, next_e = 0;
1172
1173         memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1174
1175         /* Read the main descriptor sequence */
1176         for (;(!done && block <= lastblock); block++)
1177         {
1178
1179                 bh = udf_read_tagged(sb, block, block, &ident);
1180                 if (!bh)
1181                         break;
1182
1183                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1184                 gd = (struct generic_desc *)bh->b_data;
1185                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1186                 switch (ident)
1187                 {
1188                         case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1189                                 if (vdsn >= vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum)
1190                                 {
1191                                         vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum = vdsn;
1192                                         vds[VDS_POS_PRIMARY_VOL_DESC].block = block;
1193                                 }
1194                                 break;
1195                         case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1196                                 if (vdsn >= vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum)
1197                                 {
1198                                         vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum = vdsn;
1199                                         vds[VDS_POS_VOL_DESC_PTR].block = block;
1200
1201                                         vdp = (struct volDescPtr *)bh->b_data;
1202                                         next_s = le32_to_cpu(vdp->nextVolDescSeqExt.extLocation);
1203                                         next_e = le32_to_cpu(vdp->nextVolDescSeqExt.extLength);
1204                                         next_e = next_e >> sb->s_blocksize_bits;
1205                                         next_e += next_s;
1206                                 }
1207                                 break;
1208                         case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1209                                 if (vdsn >= vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum)
1210                                 {
1211                                         vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum = vdsn;
1212                                         vds[VDS_POS_IMP_USE_VOL_DESC].block = block;
1213                                 }
1214                                 break;
1215                         case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1216                                 if (!vds[VDS_POS_PARTITION_DESC].block)
1217                                         vds[VDS_POS_PARTITION_DESC].block = block;
1218                                 break;
1219                         case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1220                                 if (vdsn >= vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum)
1221                                 {
1222                                         vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum = vdsn;
1223                                         vds[VDS_POS_LOGICAL_VOL_DESC].block = block;
1224                                 }
1225                                 break;
1226                         case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1227                                 if (vdsn >= vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum)
1228                                 {
1229                                         vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum = vdsn;
1230                                         vds[VDS_POS_UNALLOC_SPACE_DESC].block = block;
1231                                 }
1232                                 break;
1233                         case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1234                                 vds[VDS_POS_TERMINATING_DESC].block = block;
1235                                 if (next_e)
1236                                 {
1237                                         block = next_s;
1238                                         lastblock = next_e;
1239                                         next_s = next_e = 0;
1240                                 }
1241                                 else
1242                                         done = 1;
1243                                 break;
1244                 }
1245                 udf_release_data(bh);
1246         }
1247         for (i=0; i<VDS_POS_LENGTH; i++)
1248         {
1249                 if (vds[i].block)
1250                 {
1251                         bh = udf_read_tagged(sb, vds[i].block, vds[i].block, &ident);
1252
1253                         if (i == VDS_POS_PRIMARY_VOL_DESC)
1254                                 udf_load_pvoldesc(sb, bh);
1255                         else if (i == VDS_POS_LOGICAL_VOL_DESC)
1256                                 udf_load_logicalvol(sb, bh, fileset);
1257                         else if (i == VDS_POS_PARTITION_DESC)
1258                         {
1259                                 struct buffer_head *bh2 = NULL;
1260                                 udf_load_partdesc(sb, bh);
1261                                 for (j=vds[i].block+1; j<vds[VDS_POS_TERMINATING_DESC].block; j++)
1262                                 {
1263                                         bh2 = udf_read_tagged(sb, j, j, &ident);
1264                                         gd = (struct generic_desc *)bh2->b_data;
1265                                         if (ident == TAG_IDENT_PD)
1266                                                 udf_load_partdesc(sb, bh2);
1267                                         udf_release_data(bh2);
1268                                 }
1269                         }
1270                         udf_release_data(bh);
1271                 }
1272         }
1273
1274         return 0;
1275 }
1276
1277 /*
1278  * udf_check_valid()
1279  */
1280 static int
1281 udf_check_valid(struct super_block *sb, int novrs, int silent)
1282 {
1283         long block;
1284
1285         if (novrs)
1286         {
1287                 udf_debug("Validity check skipped because of novrs option\n");
1288                 return 0;
1289         }
1290         /* Check that it is NSR02 compliant */
1291         /* Process any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
1292         else if ((block = udf_vrs(sb, silent)) == -1)
1293         {
1294                 udf_debug("Failed to read byte 32768. Assuming open disc. Skipping validity check\n");
1295                 if (!UDF_SB_LASTBLOCK(sb))
1296                         UDF_SB_LASTBLOCK(sb) = udf_get_last_block(sb);
1297                 return 0;
1298         }
1299         else
1300                 return !block;
1301 }
1302
1303 static int
1304 udf_load_partition(struct super_block *sb, kernel_lb_addr *fileset)
1305 {
1306         struct anchorVolDescPtr *anchor;
1307         uint16_t ident;
1308         struct buffer_head *bh;
1309         long main_s, main_e, reserve_s, reserve_e;
1310         int i, j;
1311
1312         if (!sb)
1313                 return 1;
1314
1315         for (i = 0; i < ARRAY_SIZE(UDF_SB_ANCHOR(sb)); i++) {
1316                 if (UDF_SB_ANCHOR(sb)[i] && (bh = udf_read_tagged(sb,
1317                         UDF_SB_ANCHOR(sb)[i], UDF_SB_ANCHOR(sb)[i], &ident)))
1318                 {
1319                         anchor = (struct anchorVolDescPtr *)bh->b_data;
1320
1321                         /* Locate the main sequence */
1322                         main_s = le32_to_cpu( anchor->mainVolDescSeqExt.extLocation );
1323                         main_e = le32_to_cpu( anchor->mainVolDescSeqExt.extLength );
1324                         main_e = main_e >> sb->s_blocksize_bits;
1325                         main_e += main_s;
1326
1327                         /* Locate the reserve sequence */
1328                         reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1329                         reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1330                         reserve_e = reserve_e >> sb->s_blocksize_bits;
1331                         reserve_e += reserve_s;
1332
1333                         udf_release_data(bh);
1334
1335                         /* Process the main & reserve sequences */
1336                         /* responsible for finding the PartitionDesc(s) */
1337                         if (!(udf_process_sequence(sb, main_s, main_e, fileset) &&
1338                                 udf_process_sequence(sb, reserve_s, reserve_e, fileset)))
1339                         {
1340                                 break;
1341                         }
1342                 }
1343         }
1344
1345         if (i == ARRAY_SIZE(UDF_SB_ANCHOR(sb))) {
1346                 udf_debug("No Anchor block found\n");
1347                 return 1;
1348         } else
1349                 udf_debug("Using anchor in block %d\n", UDF_SB_ANCHOR(sb)[i]);
1350
1351         for (i=0; i<UDF_SB_NUMPARTS(sb); i++)
1352         {
1353                 switch UDF_SB_PARTTYPE(sb, i)
1354                 {
1355                         case UDF_VIRTUAL_MAP15:
1356                         case UDF_VIRTUAL_MAP20:
1357                         {
1358                                 kernel_lb_addr ino;
1359
1360                                 if (!UDF_SB_LASTBLOCK(sb))
1361                                 {
1362                                         UDF_SB_LASTBLOCK(sb) = udf_get_last_block(sb);
1363                                         udf_find_anchor(sb);
1364                                 }
1365
1366                                 if (!UDF_SB_LASTBLOCK(sb))
1367                                 {
1368                                         udf_debug("Unable to determine Lastblock (For Virtual Partition)\n");
1369                                         return 1;
1370                                 }
1371
1372                                 for (j=0; j<UDF_SB_NUMPARTS(sb); j++)
1373                                 {
1374                                         if (j != i &&
1375                                                 UDF_SB_PARTVSN(sb,i) == UDF_SB_PARTVSN(sb,j) &&
1376                                                 UDF_SB_PARTNUM(sb,i) == UDF_SB_PARTNUM(sb,j))
1377                                         {
1378                                                 ino.partitionReferenceNum = j;
1379                                                 ino.logicalBlockNum = UDF_SB_LASTBLOCK(sb) -
1380                                                         UDF_SB_PARTROOT(sb,j);
1381                                                 break;
1382                                         }
1383                                 }
1384
1385                                 if (j == UDF_SB_NUMPARTS(sb))
1386                                         return 1;
1387
1388                                 if (!(UDF_SB_VAT(sb) = udf_iget(sb, ino)))
1389                                         return 1;
1390
1391                                 if (UDF_SB_PARTTYPE(sb,i) == UDF_VIRTUAL_MAP15)
1392                                 {
1393                                         UDF_SB_TYPEVIRT(sb,i).s_start_offset = udf_ext0_offset(UDF_SB_VAT(sb));
1394                                         UDF_SB_TYPEVIRT(sb,i).s_num_entries = (UDF_SB_VAT(sb)->i_size - 36) >> 2;
1395                                 }
1396                                 else if (UDF_SB_PARTTYPE(sb,i) == UDF_VIRTUAL_MAP20)
1397                                 {
1398                                         struct buffer_head *bh = NULL;
1399                                         uint32_t pos;
1400
1401                                         pos = udf_block_map(UDF_SB_VAT(sb), 0);
1402                                         bh = sb_bread(sb, pos);
1403                                         UDF_SB_TYPEVIRT(sb,i).s_start_offset =
1404                                                 le16_to_cpu(((struct virtualAllocationTable20 *)bh->b_data + udf_ext0_offset(UDF_SB_VAT(sb)))->lengthHeader) +
1405                                                         udf_ext0_offset(UDF_SB_VAT(sb));
1406                                         UDF_SB_TYPEVIRT(sb,i).s_num_entries = (UDF_SB_VAT(sb)->i_size -
1407                                                 UDF_SB_TYPEVIRT(sb,i).s_start_offset) >> 2;
1408                                         udf_release_data(bh);
1409                                 }
1410                                 UDF_SB_PARTROOT(sb,i) = udf_get_pblock(sb, 0, i, 0);
1411                                 UDF_SB_PARTLEN(sb,i) = UDF_SB_PARTLEN(sb,ino.partitionReferenceNum);
1412                         }
1413                 }
1414         }
1415         return 0;
1416 }
1417
1418 static void udf_open_lvid(struct super_block *sb)
1419 {
1420         if (UDF_SB_LVIDBH(sb))
1421         {
1422                 int i;
1423                 kernel_timestamp cpu_time;
1424
1425                 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1426                 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1427                 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
1428                         UDF_SB_LVID(sb)->recordingDateAndTime = cpu_to_lets(cpu_time);
1429                 UDF_SB_LVID(sb)->integrityType = LVID_INTEGRITY_TYPE_OPEN;
1430
1431                 UDF_SB_LVID(sb)->descTag.descCRC =
1432                         cpu_to_le16(udf_crc((char *)UDF_SB_LVID(sb) + sizeof(tag),
1433                         le16_to_cpu(UDF_SB_LVID(sb)->descTag.descCRCLength), 0));
1434
1435                 UDF_SB_LVID(sb)->descTag.tagChecksum = 0;
1436                 for (i=0; i<16; i++)
1437                         if (i != 4)
1438                                 UDF_SB_LVID(sb)->descTag.tagChecksum +=
1439                                         ((uint8_t *)&(UDF_SB_LVID(sb)->descTag))[i];
1440
1441                 mark_buffer_dirty(UDF_SB_LVIDBH(sb));
1442         }
1443 }
1444
1445 static void udf_close_lvid(struct super_block *sb)
1446 {
1447         if (UDF_SB_LVIDBH(sb) &&
1448                 UDF_SB_LVID(sb)->integrityType == LVID_INTEGRITY_TYPE_OPEN)
1449         {
1450                 int i;
1451                 kernel_timestamp cpu_time;
1452
1453                 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1454                 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1455                 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
1456                         UDF_SB_LVID(sb)->recordingDateAndTime = cpu_to_lets(cpu_time);
1457                 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(UDF_SB_LVIDIU(sb)->maxUDFWriteRev))
1458                         UDF_SB_LVIDIU(sb)->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1459                 if (UDF_SB_UDFREV(sb) > le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev))
1460                         UDF_SB_LVIDIU(sb)->minUDFReadRev = cpu_to_le16(UDF_SB_UDFREV(sb));
1461                 if (UDF_SB_UDFREV(sb) > le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev))
1462                         UDF_SB_LVIDIU(sb)->minUDFWriteRev = cpu_to_le16(UDF_SB_UDFREV(sb));
1463                 UDF_SB_LVID(sb)->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1464
1465                 UDF_SB_LVID(sb)->descTag.descCRC =
1466                         cpu_to_le16(udf_crc((char *)UDF_SB_LVID(sb) + sizeof(tag),
1467                         le16_to_cpu(UDF_SB_LVID(sb)->descTag.descCRCLength), 0));
1468
1469                 UDF_SB_LVID(sb)->descTag.tagChecksum = 0;
1470                 for (i=0; i<16; i++)
1471                         if (i != 4)
1472                                 UDF_SB_LVID(sb)->descTag.tagChecksum +=
1473                                         ((uint8_t *)&(UDF_SB_LVID(sb)->descTag))[i];
1474
1475                 mark_buffer_dirty(UDF_SB_LVIDBH(sb));
1476         }
1477 }
1478
1479 /*
1480  * udf_read_super
1481  *
1482  * PURPOSE
1483  *      Complete the specified super block.
1484  *
1485  * PRE-CONDITIONS
1486  *      sb                      Pointer to superblock to complete - never NULL.
1487  *      sb->s_dev               Device to read suberblock from.
1488  *      options                 Pointer to mount options.
1489  *      silent                  Silent flag.
1490  *
1491  * HISTORY
1492  *      July 1, 1997 - Andrew E. Mileski
1493  *      Written, tested, and released.
1494  */
1495 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1496 {
1497         int i;
1498         struct inode *inode=NULL;
1499         struct udf_options uopt;
1500         kernel_lb_addr rootdir, fileset;
1501         struct udf_sb_info *sbi;
1502
1503         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1504         uopt.uid = -1;
1505         uopt.gid = -1;
1506         uopt.umask = 0;
1507
1508         sbi = kmalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1509         if (!sbi)
1510                 return -ENOMEM;
1511         sb->s_fs_info = sbi;
1512         memset(UDF_SB(sb), 0x00, sizeof(struct udf_sb_info));
1513
1514         mutex_init(&sbi->s_alloc_mutex);
1515
1516         if (!udf_parse_options((char *)options, &uopt))
1517                 goto error_out;
1518
1519         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1520             uopt.flags & (1 << UDF_FLAG_NLS_MAP))
1521         {
1522                 udf_error(sb, "udf_read_super",
1523                         "utf8 cannot be combined with iocharset\n");
1524                 goto error_out;
1525         }
1526 #ifdef CONFIG_UDF_NLS
1527         if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map)
1528         {
1529                 uopt.nls_map = load_nls_default();
1530                 if (!uopt.nls_map)
1531                         uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1532                 else
1533                         udf_debug("Using default NLS map\n");
1534         }
1535 #endif
1536         if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1537                 uopt.flags |= (1 << UDF_FLAG_UTF8);
1538
1539         fileset.logicalBlockNum = 0xFFFFFFFF;
1540         fileset.partitionReferenceNum = 0xFFFF;
1541
1542         UDF_SB(sb)->s_flags = uopt.flags;
1543         UDF_SB(sb)->s_uid = uopt.uid;
1544         UDF_SB(sb)->s_gid = uopt.gid;
1545         UDF_SB(sb)->s_umask = uopt.umask;
1546         UDF_SB(sb)->s_nls_map = uopt.nls_map;
1547
1548         /* Set the block size for all transfers */
1549         if (!udf_set_blocksize(sb, uopt.blocksize))
1550                 goto error_out;
1551
1552         if ( uopt.session == 0xFFFFFFFF )
1553                 UDF_SB_SESSION(sb) = udf_get_last_session(sb);
1554         else
1555                 UDF_SB_SESSION(sb) = uopt.session;
1556
1557         udf_debug("Multi-session=%d\n", UDF_SB_SESSION(sb));
1558
1559         UDF_SB_LASTBLOCK(sb) = uopt.lastblock;
1560         UDF_SB_ANCHOR(sb)[0] = UDF_SB_ANCHOR(sb)[1] = 0;
1561         UDF_SB_ANCHOR(sb)[2] = uopt.anchor;
1562         UDF_SB_ANCHOR(sb)[3] = 256;
1563
1564         if (udf_check_valid(sb, uopt.novrs, silent)) /* read volume recognition sequences */
1565         {
1566                 printk("UDF-fs: No VRS found\n");
1567                 goto error_out;
1568         }
1569
1570         udf_find_anchor(sb);
1571
1572         /* Fill in the rest of the superblock */
1573         sb->s_op = &udf_sb_ops;
1574         sb->dq_op = NULL;
1575         sb->s_dirt = 0;
1576         sb->s_magic = UDF_SUPER_MAGIC;
1577         sb->s_time_gran = 1000;
1578
1579         if (udf_load_partition(sb, &fileset))
1580         {
1581                 printk("UDF-fs: No partition found (1)\n");
1582                 goto error_out;
1583         }
1584
1585         udf_debug("Lastblock=%d\n", UDF_SB_LASTBLOCK(sb));
1586
1587         if ( UDF_SB_LVIDBH(sb) )
1588         {
1589                 uint16_t minUDFReadRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev);
1590                 uint16_t minUDFWriteRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev);
1591                 /* uint16_t maxUDFWriteRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->maxUDFWriteRev); */
1592
1593                 if (minUDFReadRev > UDF_MAX_READ_VERSION)
1594                 {
1595                         printk("UDF-fs: minUDFReadRev=%x (max is %x)\n",
1596                                 le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev),
1597                                 UDF_MAX_READ_VERSION);
1598                         goto error_out;
1599                 }
1600                 else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
1601                 {
1602                         sb->s_flags |= MS_RDONLY;
1603                 }
1604
1605                 UDF_SB_UDFREV(sb) = minUDFWriteRev;
1606
1607                 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1608                         UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
1609                 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
1610                         UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
1611         }
1612
1613         if ( !UDF_SB_NUMPARTS(sb) )
1614         {
1615                 printk("UDF-fs: No partition found (2)\n");
1616                 goto error_out;
1617         }
1618
1619         if ( udf_find_fileset(sb, &fileset, &rootdir) )
1620         {
1621                 printk("UDF-fs: No fileset found\n");
1622                 goto error_out;
1623         }
1624
1625         if (!silent)
1626         {
1627                 kernel_timestamp ts;
1628                 udf_time_to_stamp(&ts, UDF_SB_RECORDTIME(sb));
1629                 udf_info("UDF %s (%s) Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
1630                         UDFFS_VERSION, UDFFS_DATE,
1631                         UDF_SB_VOLIDENT(sb), ts.year, ts.month, ts.day, ts.hour, ts.minute,
1632                         ts.typeAndTimezone);
1633         }
1634         if (!(sb->s_flags & MS_RDONLY))
1635                 udf_open_lvid(sb);
1636
1637         /* Assign the root inode */
1638         /* assign inodes by physical block number */
1639         /* perhaps it's not extensible enough, but for now ... */
1640         inode = udf_iget(sb, rootdir);
1641         if (!inode)
1642         {
1643                 printk("UDF-fs: Error in udf_iget, block=%d, partition=%d\n",
1644                         rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
1645                 goto error_out;
1646         }
1647
1648         /* Allocate a dentry for the root inode */
1649         sb->s_root = d_alloc_root(inode);
1650         if (!sb->s_root)
1651         {
1652                 printk("UDF-fs: Couldn't allocate root dentry\n");
1653                 iput(inode);
1654                 goto error_out;
1655         }
1656         sb->s_maxbytes = MAX_LFS_FILESIZE;
1657         return 0;
1658
1659 error_out:
1660         if (UDF_SB_VAT(sb))
1661                 iput(UDF_SB_VAT(sb));
1662         if (UDF_SB_NUMPARTS(sb))
1663         {
1664                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1665                         iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1666                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1667                         iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1668                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1669                         UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_uspace);
1670                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1671                         UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_fspace);
1672                 if (UDF_SB_PARTTYPE(sb, UDF_SB_PARTITION(sb)) == UDF_SPARABLE_MAP15)
1673                 {
1674                         for (i=0; i<4; i++)
1675                                 udf_release_data(UDF_SB_TYPESPAR(sb, UDF_SB_PARTITION(sb)).s_spar_map[i]);
1676                 }
1677         }
1678 #ifdef CONFIG_UDF_NLS
1679         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1680                 unload_nls(UDF_SB(sb)->s_nls_map);
1681 #endif
1682         if (!(sb->s_flags & MS_RDONLY))
1683                 udf_close_lvid(sb);
1684         udf_release_data(UDF_SB_LVIDBH(sb));
1685         UDF_SB_FREE(sb);
1686         kfree(sbi);
1687         sb->s_fs_info = NULL;
1688         return -EINVAL;
1689 }
1690
1691 void udf_error(struct super_block *sb, const char *function,
1692         const char *fmt, ...)
1693 {
1694         va_list args;
1695
1696         if (!(sb->s_flags & MS_RDONLY))
1697         {
1698                 /* mark sb error */
1699                 sb->s_dirt = 1;
1700         }
1701         va_start(args, fmt);
1702         vsprintf(error_buf, fmt, args);
1703         va_end(args);
1704         printk (KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
1705                 sb->s_id, function, error_buf);
1706 }
1707
1708 void udf_warning(struct super_block *sb, const char *function,
1709         const char *fmt, ...)
1710 {
1711         va_list args;
1712
1713         va_start (args, fmt);
1714         vsprintf(error_buf, fmt, args);
1715         va_end(args);
1716         printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
1717                 sb->s_id, function, error_buf);
1718 }
1719
1720 /*
1721  * udf_put_super
1722  *
1723  * PURPOSE
1724  *      Prepare for destruction of the superblock.
1725  *
1726  * DESCRIPTION
1727  *      Called before the filesystem is unmounted.
1728  *
1729  * HISTORY
1730  *      July 1, 1997 - Andrew E. Mileski
1731  *      Written, tested, and released.
1732  */
1733 static void
1734 udf_put_super(struct super_block *sb)
1735 {
1736         int i;
1737
1738         if (UDF_SB_VAT(sb))
1739                 iput(UDF_SB_VAT(sb));
1740         if (UDF_SB_NUMPARTS(sb))
1741         {
1742                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1743                         iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1744                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1745                         iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1746                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1747                         UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_uspace);
1748                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1749                         UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_fspace);
1750                 if (UDF_SB_PARTTYPE(sb, UDF_SB_PARTITION(sb)) == UDF_SPARABLE_MAP15)
1751                 {
1752                         for (i=0; i<4; i++)
1753                                 udf_release_data(UDF_SB_TYPESPAR(sb, UDF_SB_PARTITION(sb)).s_spar_map[i]);
1754                 }
1755         }
1756 #ifdef CONFIG_UDF_NLS
1757         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1758                 unload_nls(UDF_SB(sb)->s_nls_map);
1759 #endif
1760         if (!(sb->s_flags & MS_RDONLY))
1761                 udf_close_lvid(sb);
1762         udf_release_data(UDF_SB_LVIDBH(sb));
1763         UDF_SB_FREE(sb);
1764         kfree(sb->s_fs_info);
1765         sb->s_fs_info = NULL;
1766 }
1767
1768 /*
1769  * udf_stat_fs
1770  *
1771  * PURPOSE
1772  *      Return info about the filesystem.
1773  *
1774  * DESCRIPTION
1775  *      Called by sys_statfs()
1776  *
1777  * HISTORY
1778  *      July 1, 1997 - Andrew E. Mileski
1779  *      Written, tested, and released.
1780  */
1781 static int
1782 udf_statfs(struct dentry *dentry, struct kstatfs *buf)
1783 {
1784         struct super_block *sb = dentry->d_sb;
1785
1786         buf->f_type = UDF_SUPER_MAGIC;
1787         buf->f_bsize = sb->s_blocksize;
1788         buf->f_blocks = UDF_SB_PARTLEN(sb, UDF_SB_PARTITION(sb));
1789         buf->f_bfree = udf_count_free(sb);
1790         buf->f_bavail = buf->f_bfree;
1791         buf->f_files = (UDF_SB_LVIDBH(sb) ?
1792                 (le32_to_cpu(UDF_SB_LVIDIU(sb)->numFiles) +
1793                 le32_to_cpu(UDF_SB_LVIDIU(sb)->numDirs)) : 0) + buf->f_bfree;
1794         buf->f_ffree = buf->f_bfree;
1795         /* __kernel_fsid_t f_fsid */
1796         buf->f_namelen = UDF_NAME_LEN-2;
1797
1798         return 0;
1799 }
1800
1801 static unsigned char udf_bitmap_lookup[16] = {
1802         0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4
1803 };
1804
1805 static unsigned int
1806 udf_count_free_bitmap(struct super_block *sb, struct udf_bitmap *bitmap)
1807 {
1808         struct buffer_head *bh = NULL;
1809         unsigned int accum = 0;
1810         int index;
1811         int block = 0, newblock;
1812         kernel_lb_addr loc;
1813         uint32_t bytes;
1814         uint8_t value;
1815         uint8_t *ptr;
1816         uint16_t ident;
1817         struct spaceBitmapDesc *bm;
1818
1819         lock_kernel();
1820
1821         loc.logicalBlockNum = bitmap->s_extPosition;
1822         loc.partitionReferenceNum = UDF_SB_PARTITION(sb);
1823         bh = udf_read_ptagged(sb, loc, 0, &ident);
1824
1825         if (!bh)
1826         {
1827                 printk(KERN_ERR "udf: udf_count_free failed\n");
1828                 goto out;
1829         }
1830         else if (ident != TAG_IDENT_SBD)
1831         {
1832                 udf_release_data(bh);
1833                 printk(KERN_ERR "udf: udf_count_free failed\n");
1834                 goto out;
1835         }
1836
1837         bm = (struct spaceBitmapDesc *)bh->b_data;
1838         bytes = le32_to_cpu(bm->numOfBytes);
1839         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
1840         ptr = (uint8_t *)bh->b_data;
1841
1842         while ( bytes > 0 )
1843         {
1844                 while ((bytes > 0) && (index < sb->s_blocksize))
1845                 {
1846                         value = ptr[index];
1847                         accum += udf_bitmap_lookup[ value & 0x0f ];
1848                         accum += udf_bitmap_lookup[ value >> 4 ];
1849                         index++;
1850                         bytes--;
1851                 }
1852                 if ( bytes )
1853                 {
1854                         udf_release_data(bh);
1855                         newblock = udf_get_lb_pblock(sb, loc, ++block);
1856                         bh = udf_tread(sb, newblock);
1857                         if (!bh)
1858                         {
1859                                 udf_debug("read failed\n");
1860                                 goto out;
1861                         }
1862                         index = 0;
1863                         ptr = (uint8_t *)bh->b_data;
1864                 }
1865         }
1866         udf_release_data(bh);
1867
1868 out:
1869         unlock_kernel();
1870
1871         return accum;
1872 }
1873
1874 static unsigned int
1875 udf_count_free_table(struct super_block *sb, struct inode * table)
1876 {
1877         unsigned int accum = 0;
1878         uint32_t extoffset, elen;
1879         kernel_lb_addr bloc, eloc;
1880         int8_t etype;
1881         struct buffer_head *bh = NULL;
1882
1883         lock_kernel();
1884
1885         bloc = UDF_I_LOCATION(table);
1886         extoffset = sizeof(struct unallocSpaceEntry);
1887
1888         while ((etype = udf_next_aext(table, &bloc, &extoffset, &eloc, &elen, &bh, 1)) != -1)
1889         {
1890                 accum += (elen >> table->i_sb->s_blocksize_bits);
1891         }
1892         udf_release_data(bh);
1893
1894         unlock_kernel();
1895
1896         return accum;
1897 }
1898
1899 static unsigned int
1900 udf_count_free(struct super_block *sb)
1901 {
1902         unsigned int accum = 0;
1903
1904         if (UDF_SB_LVIDBH(sb))
1905         {
1906                 if (le32_to_cpu(UDF_SB_LVID(sb)->numOfPartitions) > UDF_SB_PARTITION(sb))
1907                 {
1908                         accum = le32_to_cpu(UDF_SB_LVID(sb)->freeSpaceTable[UDF_SB_PARTITION(sb)]);
1909
1910                         if (accum == 0xFFFFFFFF)
1911                                 accum = 0;
1912                 }
1913         }
1914
1915         if (accum)
1916                 return accum;
1917
1918         if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1919         {
1920                 accum += udf_count_free_bitmap(sb,
1921                         UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_bitmap);
1922         }
1923         if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1924         {
1925                 accum += udf_count_free_bitmap(sb,
1926                         UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_bitmap);
1927         }
1928         if (accum)
1929                 return accum;
1930
1931         if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1932         {
1933                 accum += udf_count_free_table(sb,
1934                         UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1935         }
1936         if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1937         {
1938                 accum += udf_count_free_table(sb,
1939                         UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1940         }
1941
1942         return accum;
1943 }