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 super_block *, struct kstatfs *);
  95
  96 /* UDF filesystem type */
  97 static struct super_block *udf_get_sb(struct file_system_type *fs_type,
  98         int flags, const char *dev_name, void *data)
  99 {
 100         return get_sb_bdev(fs_type, flags, dev_name, data, udf_fill_super);
 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                                              init_once, NULL);
 145         if (udf_inode_cachep == NULL)
 146                 return -ENOMEM;
 147         return 0;
 148 }
 149
 150 static void destroy_inodecache(void)
 151 {
 152         if (kmem_cache_destroy(udf_inode_cachep))
 153                 printk(KERN_INFO "udf_inode_cache: not all structures were freed\n");
 154 }
 155
 156 /* Superblock operations */
 157 static struct super_operations udf_sb_ops = {
 158         .alloc_inode            = udf_alloc_inode,
 159         .destroy_inode          = udf_destroy_inode,
 160         .write_inode            = udf_write_inode,
 161         .delete_inode           = udf_delete_inode,
 162         .clear_inode            = udf_clear_inode,
 163         .put_super              = udf_put_super,
 164         .write_super            = udf_write_super,
 165         .statfs                 = udf_statfs,
 166         .remount_fs             = udf_remount_fs,
 167 };
 168
 169 struct udf_options
 170 {
 171         unsigned char novrs;
 172         unsigned int blocksize;
 173         unsigned int session;
 174         unsigned int lastblock;
 175         unsigned int anchor;
 176         unsigned int volume;
 177         unsigned short partition;
 178         unsigned int fileset;
 179         unsigned int rootdir;
 180         unsigned int flags;
 181         mode_t umask;
 182         gid_t gid;
 183         uid_t uid;
 184         struct nls_table *nls_map;
 185 };
 186
 187 static int __init init_udf_fs(void)
 188 {
 189         int err;
 190         err = init_inodecache();
 191         if (err)
 192                 goto out1;
 193         err = register_filesystem(&udf_fstype);
 194         if (err)
 195                 goto out;
 196         return 0;
 197 out:
 198         destroy_inodecache();
 199 out1:
 200         return err;
 201 }
 202
 203 static void __exit exit_udf_fs(void)
 204 {
 205         unregister_filesystem(&udf_fstype);
 206         destroy_inodecache();
 207 }
 208
 209 module_init(init_udf_fs)
 210 module_exit(exit_udf_fs)
 211
 212 /*
 213  * udf_parse_options
 214  *
 215  * PURPOSE
 216  *      Parse mount options.
 217  *
 218  * DESCRIPTION
 219  *      The following mount options are supported:
 220  *
 221  *      gid=            Set the default group.
 222  *      umask=          Set the default umask.
 223  *      uid=            Set the default user.
 224  *      bs=             Set the block size.
 225  *      unhide          Show otherwise hidden files.
 226  *      undelete        Show deleted files in lists.
 227  *      adinicb         Embed data in the inode (default)
 228  *      noadinicb       Don't embed data in the inode
 229  *      shortad         Use short ad's
 230  *      longad          Use long ad's (default)
 231  *      nostrict        Unset strict conformance
 232  *      iocharset=      Set the NLS character set
 233  *
 234  *      The remaining are for debugging and disaster recovery:
 235  *
 236  *      novrs           Skip volume sequence recognition
 237  *
 238  *      The following expect a offset from 0.
 239  *
 240  *      session=        Set the CDROM session (default= last session)
 241  *      anchor=         Override standard anchor location. (default= 256)
 242  *      volume=         Override the VolumeDesc location. (unused)
 243  *      partition=      Override the PartitionDesc location. (unused)
 244  *      lastblock=      Set the last block of the filesystem/
 245  *
 246  *      The following expect a offset from the partition root.
 247  *
 248  *      fileset=        Override the fileset block location. (unused)
 249  *      rootdir=        Override the root directory location. (unused)
 250  *              WARNING: overriding the rootdir to a non-directory may
 251  *              yield highly unpredictable results.
 252  *
 253  * PRE-CONDITIONS
 254  *      options         Pointer to mount options string.
 255  *      uopts           Pointer to mount options variable.
 256  *
 257  * POST-CONDITIONS
 258  *      <return>        1       Mount options parsed okay.
 259  *      <return>        0       Error parsing mount options.
 260  *
 261  * HISTORY
 262  *      July 1, 1997 - Andrew E. Mileski
 263  *      Written, tested, and released.
 264  */
 265
 266 enum {
 267         Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
 268         Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
 269         Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
 270         Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
 271         Opt_rootdir, Opt_utf8, Opt_iocharset,
 272         Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore
 273 };
 274
 275 static match_table_t tokens = {
 276         {Opt_novrs, "novrs"},
 277         {Opt_nostrict, "nostrict"},
 278         {Opt_bs, "bs=%u"},
 279         {Opt_unhide, "unhide"},
 280         {Opt_undelete, "undelete"},
 281         {Opt_noadinicb, "noadinicb"},
 282         {Opt_adinicb, "adinicb"},
 283         {Opt_shortad, "shortad"},
 284         {Opt_longad, "longad"},
 285         {Opt_uforget, "uid=forget"},
 286         {Opt_uignore, "uid=ignore"},
 287         {Opt_gforget, "gid=forget"},
 288         {Opt_gignore, "gid=ignore"},
 289         {Opt_gid, "gid=%u"},
 290         {Opt_uid, "uid=%u"},
 291         {Opt_umask, "umask=%o"},
 292         {Opt_session, "session=%u"},
 293         {Opt_lastblock, "lastblock=%u"},
 294         {Opt_anchor, "anchor=%u"},
 295         {Opt_volume, "volume=%u"},
 296         {Opt_partition, "partition=%u"},
 297         {Opt_fileset, "fileset=%u"},
 298         {Opt_rootdir, "rootdir=%u"},
 299         {Opt_utf8, "utf8"},
 300         {Opt_iocharset, "iocharset=%s"},
 301         {Opt_err, NULL}
 302 };
 303
 304 static int
 305 udf_parse_options(char *options, struct udf_options *uopt)
 306 {
 307         char *p;
 308         int option;
 309
 310         uopt->novrs = 0;
 311         uopt->blocksize = 2048;
 312         uopt->partition = 0xFFFF;
 313         uopt->session = 0xFFFFFFFF;
 314         uopt->lastblock = 0;
 315         uopt->anchor = 0;
 316         uopt->volume = 0xFFFFFFFF;
 317         uopt->rootdir = 0xFFFFFFFF;
 318         uopt->fileset = 0xFFFFFFFF;
 319         uopt->nls_map = NULL;
 320
 321         if (!options)
 322                 return 1;
 323
 324         while ((p = strsep(&options, ",")) != NULL)
 325         {
 326                 substring_t args[MAX_OPT_ARGS];
 327                 int token;
 328                 if (!*p)
 329                         continue;
 330
 331                 token = match_token(p, tokens, args);
 332                 switch (token)
 333                 {
 334                         case Opt_novrs:
 335                                 uopt->novrs = 1;
 336                         case Opt_bs:
 337                                 if (match_int(&args[0], &option))
 338                                         return 0;
 339                                 uopt->blocksize = option;
 340                                 break;
 341                         case Opt_unhide:
 342                                 uopt->flags |= (1 << UDF_FLAG_UNHIDE);
 343                                 break;
 344                         case Opt_undelete:
 345                                 uopt->flags |= (1 << UDF_FLAG_UNDELETE);
 346                                 break;
 347                         case Opt_noadinicb:
 348                                 uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
 349                                 break;
 350                         case Opt_adinicb:
 351                                 uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
 352                                 break;
 353                         case Opt_shortad:
 354                                 uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
 355                                 break;
 356                         case Opt_longad:
 357                                 uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
 358                                 break;
 359                         case Opt_gid:
 360                                 if (match_int(args, &option))
 361                                         return 0;
 362                                 uopt->gid = option;
 363                                 break;
 364                         case Opt_uid:
 365                                 if (match_int(args, &option))
 366                                         return 0;
 367                                 uopt->uid = option;
 368                                 break;
 369                         case Opt_umask:
 370                                 if (match_octal(args, &option))
 371                                         return 0;
 372                                 uopt->umask = option;
 373                                 break;
 374                         case Opt_nostrict:
 375                                 uopt->flags &= ~(1 << UDF_FLAG_STRICT);
 376                                 break;
 377                         case Opt_session:
 378                                 if (match_int(args, &option))
 379                                         return 0;
 380                                 uopt->session = option;
 381                                 break;
 382                         case Opt_lastblock:
 383                                 if (match_int(args, &option))
 384                                         return 0;
 385                                 uopt->lastblock = option;
 386                                 break;
 387                         case Opt_anchor:
 388                                 if (match_int(args, &option))
 389                                         return 0;
 390                                 uopt->anchor = option;
 391                                 break;
 392                         case Opt_volume:
 393                                 if (match_int(args, &option))
 394                                         return 0;
 395                                 uopt->volume = option;
 396                                 break;
 397                         case Opt_partition:
 398                                 if (match_int(args, &option))
 399                                         return 0;
 400                                 uopt->partition = option;
 401                                 break;
 402                         case Opt_fileset:
 403                                 if (match_int(args, &option))
 404                                         return 0;
 405                                 uopt->fileset = option;
 406                                 break;
 407                         case Opt_rootdir:
 408                                 if (match_int(args, &option))
 409                                         return 0;
 410                                 uopt->rootdir = option;
 411                                 break;
 412                         case Opt_utf8:
 413                                 uopt->flags |= (1 << UDF_FLAG_UTF8);
 414                                 break;
 415 #ifdef CONFIG_UDF_NLS
 416                         case Opt_iocharset:
 417                                 uopt->nls_map = load_nls(args[0].from);
 418                                 uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
 419                                 break;
 420 #endif
 421                         case Opt_uignore:
 422                                 uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
 423                                 break;
 424                         case Opt_uforget:
 425                                 uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
 426                                 break;
 427                         case Opt_gignore:
 428                             uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
 429                                 break;
 430                         case Opt_gforget:
 431                             uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
 432                                 break;
 433                         default:
 434                                 printk(KERN_ERR "udf: bad mount option \"%s\" "
 435                                                 "or missing value\n", p);
 436                         return 0;
 437                 }
 438         }
 439         return 1;
 440 }
 441
 442 void
 443 udf_write_super(struct super_block *sb)
 444 {
 445         lock_kernel();
 446         if (!(sb->s_flags & MS_RDONLY))
 447                 udf_open_lvid(sb);
 448         sb->s_dirt = 0;
 449         unlock_kernel();
 450 }
 451
 452 static int
 453 udf_remount_fs(struct super_block *sb, int *flags, char *options)
 454 {
 455         struct udf_options uopt;
 456
 457         uopt.flags = UDF_SB(sb)->s_flags ;
 458         uopt.uid   = UDF_SB(sb)->s_uid ;
 459         uopt.gid   = UDF_SB(sb)->s_gid ;
 460         uopt.umask = UDF_SB(sb)->s_umask ;
 461
 462         if ( !udf_parse_options(options, &uopt) )
 463                 return -EINVAL;
 464
 465         UDF_SB(sb)->s_flags = uopt.flags;
 466         UDF_SB(sb)->s_uid   = uopt.uid;
 467         UDF_SB(sb)->s_gid   = uopt.gid;
 468         UDF_SB(sb)->s_umask = uopt.umask;
 469
 470         if (UDF_SB_LVIDBH(sb)) {
 471                 int write_rev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev);
 472                 if (write_rev > UDF_MAX_WRITE_VERSION)
 473                         *flags |= MS_RDONLY;
 474         }
 475
 476         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 477                 return 0;
 478         if (*flags & MS_RDONLY)
 479                 udf_close_lvid(sb);
 480         else
 481                 udf_open_lvid(sb);
 482
 483         return 0;
 484 }
 485
 486 /*
 487  * udf_set_blocksize
 488  *
 489  * PURPOSE
 490  *      Set the block size to be used in all transfers.
 491  *
 492  * DESCRIPTION
 493  *      To allow room for a DMA transfer, it is best to guess big when unsure.
 494  *      This routine picks 2048 bytes as the blocksize when guessing. This
 495  *      should be adequate until devices with larger block sizes become common.
 496  *
 497  *      Note that the Linux kernel can currently only deal with blocksizes of
 498  *      512, 1024, 2048, 4096, and 8192 bytes.
 499  *
 500  * PRE-CONDITIONS
 501  *      sb                      Pointer to _locked_ superblock.
 502  *
 503  * POST-CONDITIONS
 504  *      sb->s_blocksize         Blocksize.
 505  *      sb->s_blocksize_bits    log2 of blocksize.
 506  *      <return>        0       Blocksize is valid.
 507  *      <return>        1       Blocksize is invalid.
 508  *
 509  * HISTORY
 510  *      July 1, 1997 - Andrew E. Mileski
 511  *      Written, tested, and released.
 512  */
 513 static  int
 514 udf_set_blocksize(struct super_block *sb, int bsize)
 515 {
 516         if (!sb_min_blocksize(sb, bsize)) {
 517                 udf_debug("Bad block size (%d)\n", bsize);
 518                 printk(KERN_ERR "udf: bad block size (%d)\n", bsize);
 519                 return 0;
 520         }
 521         return sb->s_blocksize;
 522 }
 523
 524 static int
 525 udf_vrs(struct super_block *sb, int silent)
 526 {
 527         struct volStructDesc *vsd = NULL;
 528         int sector = 32768;
 529         int sectorsize;
 530         struct buffer_head *bh = NULL;
 531         int iso9660=0;
 532         int nsr02=0;
 533         int nsr03=0;
 534
 535         /* Block size must be a multiple of 512 */
 536         if (sb->s_blocksize & 511)
 537                 return 0;
 538
 539         if (sb->s_blocksize < sizeof(struct volStructDesc))
 540                 sectorsize = sizeof(struct volStructDesc);
 541         else
 542                 sectorsize = sb->s_blocksize;
 543
 544         sector += (UDF_SB_SESSION(sb) << sb->s_blocksize_bits);
 545
 546         udf_debug("Starting at sector %u (%ld byte sectors)\n",
 547                 (sector >> sb->s_blocksize_bits), sb->s_blocksize);
 548         /* Process the sequence (if applicable) */
 549         for (;!nsr02 && !nsr03; sector += sectorsize)
 550         {
 551                 /* Read a block */
 552                 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
 553                 if (!bh)
 554                         break;
 555
 556                 /* Look for ISO  descriptors */
 557                 vsd = (struct volStructDesc *)(bh->b_data +
 558                         (sector & (sb->s_blocksize - 1)));
 559
 560                 if (vsd->stdIdent[0] == 0)
 561                 {
 562                         udf_release_data(bh);
 563                         break;
 564                 }
 565                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001, VSD_STD_ID_LEN))
 566                 {
 567                         iso9660 = sector;
 568                         switch (vsd->structType)
 569                         {
 570                                 case 0:
 571                                         udf_debug("ISO9660 Boot Record found\n");
 572                                         break;
 573                                 case 1:
 574                                         udf_debug("ISO9660 Primary Volume Descriptor found\n");
 575                                         break;
 576                                 case 2:
 577                                         udf_debug("ISO9660 Supplementary Volume Descriptor found\n");
 578                                         break;
 579                                 case 3:
 580                                         udf_debug("ISO9660 Volume Partition Descriptor found\n");
 581                                         break;
 582                                 case 255:
 583                                         udf_debug("ISO9660 Volume Descriptor Set Terminator found\n");
 584                                         break;
 585                                 default:
 586                                         udf_debug("ISO9660 VRS (%u) found\n", vsd->structType);
 587                                         break;
 588                         }
 589                 }
 590                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01, VSD_STD_ID_LEN))
 591                 {
 592                 }
 593                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01, VSD_STD_ID_LEN))
 594                 {
 595                         udf_release_data(bh);
 596                         break;
 597                 }
 598                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02, VSD_STD_ID_LEN))
 599                 {
 600                         nsr02 = sector;
 601                 }
 602                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03, VSD_STD_ID_LEN))
 603                 {
 604                         nsr03 = sector;
 605                 }
 606                 udf_release_data(bh);
 607         }
 608
 609         if (nsr03)
 610                 return nsr03;
 611         else if (nsr02)
 612                 return nsr02;
 613         else if (sector - (UDF_SB_SESSION(sb) << sb->s_blocksize_bits) == 32768)
 614                 return -1;
 615         else
 616                 return 0;
 617 }
 618
 619 /*
 620  * udf_find_anchor
 621  *
 622  * PURPOSE
 623  *      Find an anchor volume descriptor.
 624  *
 625  * PRE-CONDITIONS
 626  *      sb                      Pointer to _locked_ superblock.
 627  *      lastblock               Last block on media.
 628  *
 629  * POST-CONDITIONS
 630  *      <return>                1 if not found, 0 if ok
 631  *
 632  * HISTORY
 633  *      July 1, 1997 - Andrew E. Mileski
 634  *      Written, tested, and released.
 635  */
 636 static void
 637 udf_find_anchor(struct super_block *sb)
 638 {
 639         int lastblock = UDF_SB_LASTBLOCK(sb);
 640         struct buffer_head *bh = NULL;
 641         uint16_t ident;
 642         uint32_t location;
 643         int i;
 644
 645         if (lastblock)
 646         {
 647                 int varlastblock = udf_variable_to_fixed(lastblock);
 648                 int last[] =  { lastblock, lastblock - 2,
 649                                 lastblock - 150, lastblock - 152,
 650                                 varlastblock, varlastblock - 2,
 651                                 varlastblock - 150, varlastblock - 152 };
 652
 653                 lastblock = 0;
 654
 655                 /* Search for an anchor volume descriptor pointer */
 656
 657                 /*  according to spec, anchor is in either:
 658                  *     block 256
 659                  *     lastblock-256
 660                  *     lastblock
 661                  *  however, if the disc isn't closed, it could be 512 */
 662
 663                 for (i=0; (!lastblock && i<sizeof(last)/sizeof(int)); i++)
 664                 {
 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<sizeof(UDF_SB_ANCHOR(sb))/sizeof(int); i++)
 757         {
 758                 if (UDF_SB_ANCHOR(sb)[i])
 759                 {
 760                         if (!(bh = udf_read_tagged(sb,
 761                                 UDF_SB_ANCHOR(sb)[i], UDF_SB_ANCHOR(sb)[i], &ident)))
 762                         {
 763                                 UDF_SB_ANCHOR(sb)[i] = 0;
 764                         }
 765                         else
 766                         {
 767                                 udf_release_data(bh);
 768                                 if ((ident != TAG_IDENT_AVDP) && (i ||
 769                                         (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE)))
 770                                 {
 771                                         UDF_SB_ANCHOR(sb)[i] = 0;
 772                                 }
 773                         }
 774                 }
 775         }
 776
 777         UDF_SB_LASTBLOCK(sb) = lastblock;
 778 }
 779
 780 static int
 781 udf_find_fileset(struct super_block *sb, kernel_lb_addr *fileset, kernel_lb_addr *root)
 782 {
 783         struct buffer_head *bh = NULL;
 784         long lastblock;
 785         uint16_t ident;
 786
 787         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
 788                 fileset->partitionReferenceNum != 0xFFFF)
 789         {
 790                 bh = udf_read_ptagged(sb, *fileset, 0, &ident);
 791
 792                 if (!bh)
 793                         return 1;
 794                 else if (ident != TAG_IDENT_FSD)
 795                 {
 796                         udf_release_data(bh);
 797                         return 1;
 798                 }
 799
 800         }
 801
 802         if (!bh) /* Search backwards through the partitions */
 803         {
 804                 kernel_lb_addr newfileset;
 805
 806                 return 1;
 807
 808                 for (newfileset.partitionReferenceNum=UDF_SB_NUMPARTS(sb)-1;
 809                         (newfileset.partitionReferenceNum != 0xFFFF &&
 810                                 fileset->logicalBlockNum == 0xFFFFFFFF &&
 811                                 fileset->partitionReferenceNum == 0xFFFF);
 812                         newfileset.partitionReferenceNum--)
 813                 {
 814                         lastblock = UDF_SB_PARTLEN(sb, newfileset.partitionReferenceNum);
 815                         newfileset.logicalBlockNum = 0;
 816
 817                         do
 818                         {
 819                                 bh = udf_read_ptagged(sb, newfileset, 0, &ident);
 820                                 if (!bh)
 821                                 {
 822                                         newfileset.logicalBlockNum ++;
 823                                         continue;
 824                                 }
 825
 826                                 switch (ident)
 827                                 {
 828                                         case TAG_IDENT_SBD:
 829                                         {
 830                                                 struct spaceBitmapDesc *sp;
 831                                                 sp = (struct spaceBitmapDesc *)bh->b_data;
 832                                                 newfileset.logicalBlockNum += 1 +
 833                                                         ((le32_to_cpu(sp->numOfBytes) + sizeof(struct spaceBitmapDesc) - 1)
 834                                                                 >> sb->s_blocksize_bits);
 835                                                 udf_release_data(bh);
 836                                                 break;
 837                                         }
 838                                         case TAG_IDENT_FSD:
 839                                         {
 840                                                 *fileset = newfileset;
 841                                                 break;
 842                                         }
 843                                         default:
 844                                         {
 845                                                 newfileset.logicalBlockNum ++;
 846                                                 udf_release_data(bh);
 847                                                 bh = NULL;
 848                                                 break;
 849                                         }
 850                                 }
 851                         }
 852                         while (newfileset.logicalBlockNum < lastblock &&
 853                                 fileset->logicalBlockNum == 0xFFFFFFFF &&
 854                                 fileset->partitionReferenceNum == 0xFFFF);
 855                 }
 856         }
 857
 858         if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
 859                 fileset->partitionReferenceNum != 0xFFFF) && bh)
 860         {
 861                 udf_debug("Fileset at block=%d, partition=%d\n",
 862                         fileset->logicalBlockNum, fileset->partitionReferenceNum);
 863
 864                 UDF_SB_PARTITION(sb) = fileset->partitionReferenceNum;
 865                 udf_load_fileset(sb, bh, root);
 866                 udf_release_data(bh);
 867                 return 0;
 868         }
 869         return 1;
 870 }
 871
 872 static void
 873 udf_load_pvoldesc(struct super_block *sb, struct buffer_head *bh)
 874 {
 875         struct primaryVolDesc *pvoldesc;
 876         time_t recording;
 877         long recording_usec;
 878         struct ustr instr;
 879         struct ustr outstr;
 880
 881         pvoldesc = (struct primaryVolDesc *)bh->b_data;
 882
 883         if ( udf_stamp_to_time(&recording, &recording_usec,
 884                 lets_to_cpu(pvoldesc->recordingDateAndTime)) )
 885         {
 886                 kernel_timestamp ts;
 887                 ts = lets_to_cpu(pvoldesc->recordingDateAndTime);
 888                 udf_debug("recording time %ld/%ld, %04u/%02u/%02u %02u:%02u (%x)\n",
 889                         recording, recording_usec,
 890                         ts.year, ts.month, ts.day, ts.hour, ts.minute, ts.typeAndTimezone);
 891                 UDF_SB_RECORDTIME(sb).tv_sec = recording;
 892                 UDF_SB_RECORDTIME(sb).tv_nsec = recording_usec * 1000;
 893         }
 894
 895         if ( !udf_build_ustr(&instr, pvoldesc->volIdent, 32) )
 896         {
 897                 if (udf_CS0toUTF8(&outstr, &instr))
 898                 {
 899                         strncpy( UDF_SB_VOLIDENT(sb), outstr.u_name,
 900                                 outstr.u_len > 31 ? 31 : outstr.u_len);
 901                         udf_debug("volIdent[] = '%s'\n", UDF_SB_VOLIDENT(sb));
 902                 }
 903         }
 904
 905         if ( !udf_build_ustr(&instr, pvoldesc->volSetIdent, 128) )
 906         {
 907                 if (udf_CS0toUTF8(&outstr, &instr))
 908                         udf_debug("volSetIdent[] = '%s'\n", outstr.u_name);
 909         }
 910 }
 911
 912 static void
 913 udf_load_fileset(struct super_block *sb, struct buffer_head *bh, kernel_lb_addr *root)
 914 {
 915         struct fileSetDesc *fset;
 916
 917         fset = (struct fileSetDesc *)bh->b_data;
 918
 919         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
 920
 921         UDF_SB_SERIALNUM(sb) = le16_to_cpu(fset->descTag.tagSerialNum);
 922
 923         udf_debug("Rootdir at block=%d, partition=%d\n",
 924                 root->logicalBlockNum, root->partitionReferenceNum);
 925 }
 926
 927 static void
 928 udf_load_partdesc(struct super_block *sb, struct buffer_head *bh)
 929 {
 930         struct partitionDesc *p;
 931         int i;
 932
 933         p = (struct partitionDesc *)bh->b_data;
 934
 935         for (i=0; i<UDF_SB_NUMPARTS(sb); i++)
 936         {
 937                 udf_debug("Searching map: (%d == %d)\n",
 938                         UDF_SB_PARTMAPS(sb)[i].s_partition_num, le16_to_cpu(p->partitionNumber));
 939                 if (UDF_SB_PARTMAPS(sb)[i].s_partition_num == le16_to_cpu(p->partitionNumber))
 940                 {
 941                         UDF_SB_PARTLEN(sb,i) = le32_to_cpu(p->partitionLength); /* blocks */
 942                         UDF_SB_PARTROOT(sb,i) = le32_to_cpu(p->partitionStartingLocation);
 943                         if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_READ_ONLY)
 944                                 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_READ_ONLY;
 945                         if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_WRITE_ONCE)
 946                                 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_WRITE_ONCE;
 947                         if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_REWRITABLE)
 948                                 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_REWRITABLE;
 949                         if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_OVERWRITABLE)
 950                                 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_OVERWRITABLE;
 951
 952                         if (!strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) ||
 953                                 !strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
 954                         {
 955                                 struct partitionHeaderDesc *phd;
 956
 957                                 phd = (struct partitionHeaderDesc *)(p->partitionContentsUse);
 958                                 if (phd->unallocSpaceTable.extLength)
 959                                 {
 960                                         kernel_lb_addr loc = { le32_to_cpu(phd->unallocSpaceTable.extPosition), i };
 961
 962                                         UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table =
 963                                                 udf_iget(sb, loc);
 964                                         UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_UNALLOC_TABLE;
 965                                         udf_debug("unallocSpaceTable (part %d) @ %ld\n",
 966                                                 i, UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table->i_ino);
 967                                 }
 968                                 if (phd->unallocSpaceBitmap.extLength)
 969                                 {
 970                                         UDF_SB_ALLOC_BITMAP(sb, i, s_uspace);
 971                                         if (UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap != NULL)
 972                                         {
 973                                                 UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extLength =
 974                                                         le32_to_cpu(phd->unallocSpaceBitmap.extLength);
 975                                                 UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extPosition =
 976                                                         le32_to_cpu(phd->unallocSpaceBitmap.extPosition);
 977                                                 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_UNALLOC_BITMAP;
 978                                                 udf_debug("unallocSpaceBitmap (part %d) @ %d\n",
 979                                                         i, UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extPosition);
 980                                         }
 981                                 }
 982                                 if (phd->partitionIntegrityTable.extLength)
 983                                         udf_debug("partitionIntegrityTable (part %d)\n", i);
 984                                 if (phd->freedSpaceTable.extLength)
 985                                 {
 986                                         kernel_lb_addr loc = { le32_to_cpu(phd->freedSpaceTable.extPosition), i };
 987
 988                                         UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table =
 989                                                 udf_iget(sb, loc);
 990                                         UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_FREED_TABLE;
 991                                         udf_debug("freedSpaceTable (part %d) @ %ld\n",
 992                                                 i, UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table->i_ino);
 993                                 }
 994                                 if (phd->freedSpaceBitmap.extLength)
 995                                 {
 996                                         UDF_SB_ALLOC_BITMAP(sb, i, s_fspace);
 997                                         if (UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap != NULL)
 998                                         {
 999                                                 UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extLength =
1000                                                         le32_to_cpu(phd->freedSpaceBitmap.extLength);
1001                                                 UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extPosition =
1002                                                         le32_to_cpu(phd->freedSpaceBitmap.extPosition);
1003                                                 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_FREED_BITMAP;
1004                                                 udf_debug("freedSpaceBitmap (part %d) @ %d\n",
1005                                                         i, UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extPosition);
1006                                         }
1007                                 }
1008                         }
1009                         break;
1010                 }
1011         }
1012         if (i == UDF_SB_NUMPARTS(sb))
1013         {
1014                 udf_debug("Partition (%d) not found in partition map\n", le16_to_cpu(p->partitionNumber));
1015         }
1016         else
1017         {
1018                 udf_debug("Partition (%d:%d type %x) starts at physical %d, block length %d\n",
1019                         le16_to_cpu(p->partitionNumber), i, UDF_SB_PARTTYPE(sb,i),
1020                         UDF_SB_PARTROOT(sb,i), UDF_SB_PARTLEN(sb,i));
1021         }
1022 }
1023
1024 static int
1025 udf_load_logicalvol(struct super_block *sb, struct buffer_head * bh, kernel_lb_addr *fileset)
1026 {
1027         struct logicalVolDesc *lvd;
1028         int i, j, offset;
1029         uint8_t type;
1030
1031         lvd = (struct logicalVolDesc *)bh->b_data;
1032
1033         UDF_SB_ALLOC_PARTMAPS(sb, le32_to_cpu(lvd->numPartitionMaps));
1034
1035         for (i=0,offset=0;
1036                  i<UDF_SB_NUMPARTS(sb) && offset<le32_to_cpu(lvd->mapTableLength);
1037                  i++,offset+=((struct genericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapLength)
1038         {
1039                 type = ((struct genericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapType;
1040                 if (type == 1)
1041                 {
1042                         struct genericPartitionMap1 *gpm1 = (struct genericPartitionMap1 *)&(lvd->partitionMaps[offset]);
1043                         UDF_SB_PARTTYPE(sb,i) = UDF_TYPE1_MAP15;
1044                         UDF_SB_PARTVSN(sb,i) = le16_to_cpu(gpm1->volSeqNum);
1045                         UDF_SB_PARTNUM(sb,i) = le16_to_cpu(gpm1->partitionNum);
1046                         UDF_SB_PARTFUNC(sb,i) = NULL;
1047                 }
1048                 else if (type == 2)
1049                 {
1050                         struct udfPartitionMap2 *upm2 = (struct udfPartitionMap2 *)&(lvd->partitionMaps[offset]);
1051                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL, strlen(UDF_ID_VIRTUAL)))
1052                         {
1053                                 if (le16_to_cpu(((__le16 *)upm2->partIdent.identSuffix)[0]) == 0x0150)
1054                                 {
1055                                         UDF_SB_PARTTYPE(sb,i) = UDF_VIRTUAL_MAP15;
1056                                         UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_virt15;
1057                                 }
1058                                 else if (le16_to_cpu(((__le16 *)upm2->partIdent.identSuffix)[0]) == 0x0200)
1059                                 {
1060                                         UDF_SB_PARTTYPE(sb,i) = UDF_VIRTUAL_MAP20;
1061                                         UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_virt20;
1062                                 }
1063                         }
1064                         else if (!strncmp(upm2->partIdent.ident, UDF_ID_SPARABLE, strlen(UDF_ID_SPARABLE)))
1065                         {
1066                                 uint32_t loc;
1067                                 uint16_t ident;
1068                                 struct sparingTable *st;
1069                                 struct sparablePartitionMap *spm = (struct sparablePartitionMap *)&(lvd->partitionMaps[offset]);
1070
1071                                 UDF_SB_PARTTYPE(sb,i) = UDF_SPARABLE_MAP15;
1072                                 UDF_SB_TYPESPAR(sb,i).s_packet_len = le16_to_cpu(spm->packetLength);
1073                                 for (j=0; j<spm->numSparingTables; j++)
1074                                 {
1075                                         loc = le32_to_cpu(spm->locSparingTable[j]);
1076                                         UDF_SB_TYPESPAR(sb,i).s_spar_map[j] =
1077                                                 udf_read_tagged(sb, loc, loc, &ident);
1078                                         if (UDF_SB_TYPESPAR(sb,i).s_spar_map[j] != NULL)
1079                                         {
1080                                                 st = (struct sparingTable *)UDF_SB_TYPESPAR(sb,i).s_spar_map[j]->b_data;
1081                                                 if (ident != 0 ||
1082                                                         strncmp(st->sparingIdent.ident, UDF_ID_SPARING, strlen(UDF_ID_SPARING)))
1083                                                 {
1084                                                         udf_release_data(UDF_SB_TYPESPAR(sb,i).s_spar_map[j]);
1085                                                         UDF_SB_TYPESPAR(sb,i).s_spar_map[j] = NULL;
1086                                                 }
1087                                         }
1088                                 }
1089                                 UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_spar15;
1090                         }
1091                         else
1092                         {
1093                                 udf_debug("Unknown ident: %s\n", upm2->partIdent.ident);
1094                                 continue;
1095                         }
1096                         UDF_SB_PARTVSN(sb,i) = le16_to_cpu(upm2->volSeqNum);
1097                         UDF_SB_PARTNUM(sb,i) = le16_to_cpu(upm2->partitionNum);
1098                 }
1099                 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1100                         i, UDF_SB_PARTNUM(sb,i), type, UDF_SB_PARTVSN(sb,i));
1101         }
1102
1103         if (fileset)
1104         {
1105                 long_ad *la = (long_ad *)&(lvd->logicalVolContentsUse[0]);
1106
1107                 *fileset = lelb_to_cpu(la->extLocation);
1108                 udf_debug("FileSet found in LogicalVolDesc at block=%d, partition=%d\n",
1109                         fileset->logicalBlockNum,
1110                         fileset->partitionReferenceNum);
1111         }
1112         if (lvd->integritySeqExt.extLength)
1113                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1114         return 0;
1115 }
1116
1117 /*
1118  * udf_load_logicalvolint
1119  *
1120  */
1121 static void
1122 udf_load_logicalvolint(struct super_block *sb, kernel_extent_ad loc)
1123 {
1124         struct buffer_head *bh = NULL;
1125         uint16_t ident;
1126
1127         while (loc.extLength > 0 &&
1128                 (bh = udf_read_tagged(sb, loc.extLocation,
1129                         loc.extLocation, &ident)) &&
1130                 ident == TAG_IDENT_LVID)
1131         {
1132                 UDF_SB_LVIDBH(sb) = bh;
1133
1134                 if (UDF_SB_LVID(sb)->nextIntegrityExt.extLength)
1135                         udf_load_logicalvolint(sb, leea_to_cpu(UDF_SB_LVID(sb)->nextIntegrityExt));
1136
1137                 if (UDF_SB_LVIDBH(sb) != bh)
1138                         udf_release_data(bh);
1139                 loc.extLength -= sb->s_blocksize;
1140                 loc.extLocation ++;
1141         }
1142         if (UDF_SB_LVIDBH(sb) != bh)
1143                 udf_release_data(bh);
1144 }
1145
1146 /*
1147  * udf_process_sequence
1148  *
1149  * PURPOSE
1150  *      Process a main/reserve volume descriptor sequence.
1151  *
1152  * PRE-CONDITIONS
1153  *      sb                      Pointer to _locked_ superblock.
1154  *      block                   First block of first extent of the sequence.
1155  *      lastblock               Lastblock of first extent of the sequence.
1156  *
1157  * HISTORY
1158  *      July 1, 1997 - Andrew E. Mileski
1159  *      Written, tested, and released.
1160  */
1161 static  int
1162 udf_process_sequence(struct super_block *sb, long block, long lastblock, kernel_lb_addr *fileset)
1163 {
1164         struct buffer_head *bh = NULL;
1165         struct udf_vds_record vds[VDS_POS_LENGTH];
1166         struct generic_desc *gd;
1167         struct volDescPtr *vdp;
1168         int done=0;
1169         int i,j;
1170         uint32_t vdsn;
1171         uint16_t ident;
1172         long next_s = 0, next_e = 0;
1173
1174         memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1175
1176         /* Read the main descriptor sequence */
1177         for (;(!done && block <= lastblock); block++)
1178         {
1179
1180                 bh = udf_read_tagged(sb, block, block, &ident);
1181                 if (!bh)
1182                         break;
1183
1184                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1185                 gd = (struct generic_desc *)bh->b_data;
1186                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1187                 switch (ident)
1188                 {
1189                         case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1190                                 if (vdsn >= vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum)
1191                                 {
1192                                         vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum = vdsn;
1193                                         vds[VDS_POS_PRIMARY_VOL_DESC].block = block;
1194                                 }
1195                                 break;
1196                         case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1197                                 if (vdsn >= vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum)
1198                                 {
1199                                         vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum = vdsn;
1200                                         vds[VDS_POS_VOL_DESC_PTR].block = block;
1201
1202                                         vdp = (struct volDescPtr *)bh->b_data;
1203                                         next_s = le32_to_cpu(vdp->nextVolDescSeqExt.extLocation);
1204                                         next_e = le32_to_cpu(vdp->nextVolDescSeqExt.extLength);
1205                                         next_e = next_e >> sb->s_blocksize_bits;
1206                                         next_e += next_s;
1207                                 }
1208                                 break;
1209                         case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1210                                 if (vdsn >= vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum)
1211                                 {
1212                                         vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum = vdsn;
1213                                         vds[VDS_POS_IMP_USE_VOL_DESC].block = block;
1214                                 }
1215                                 break;
1216                         case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1217                                 if (!vds[VDS_POS_PARTITION_DESC].block)
1218                                         vds[VDS_POS_PARTITION_DESC].block = block;
1219                                 break;
1220                         case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1221                                 if (vdsn >= vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum)
1222                                 {
1223                                         vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum = vdsn;
1224                                         vds[VDS_POS_LOGICAL_VOL_DESC].block = block;
1225                                 }
1226                                 break;
1227                         case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1228                                 if (vdsn >= vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum)
1229                                 {
1230                                         vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum = vdsn;
1231                                         vds[VDS_POS_UNALLOC_SPACE_DESC].block = block;
1232                                 }
1233                                 break;
1234                         case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1235                                 vds[VDS_POS_TERMINATING_DESC].block = block;
1236                                 if (next_e)
1237                                 {
1238                                         block = next_s;
1239                                         lastblock = next_e;
1240                                         next_s = next_e = 0;
1241                                 }
1242                                 else
1243                                         done = 1;
1244                                 break;
1245                 }
1246                 udf_release_data(bh);
1247         }
1248         for (i=0; i<VDS_POS_LENGTH; i++)
1249         {
1250                 if (vds[i].block)
1251                 {
1252                         bh = udf_read_tagged(sb, vds[i].block, vds[i].block, &ident);
1253
1254                         if (i == VDS_POS_PRIMARY_VOL_DESC)
1255                                 udf_load_pvoldesc(sb, bh);
1256                         else if (i == VDS_POS_LOGICAL_VOL_DESC)
1257                                 udf_load_logicalvol(sb, bh, fileset);
1258                         else if (i == VDS_POS_PARTITION_DESC)
1259                         {
1260                                 struct buffer_head *bh2 = NULL;
1261                                 udf_load_partdesc(sb, bh);
1262                                 for (j=vds[i].block+1; j<vds[VDS_POS_TERMINATING_DESC].block; j++)
1263                                 {
1264                                         bh2 = udf_read_tagged(sb, j, j, &ident);
1265                                         gd = (struct generic_desc *)bh2->b_data;
1266                                         if (ident == TAG_IDENT_PD)
1267                                                 udf_load_partdesc(sb, bh2);
1268                                         udf_release_data(bh2);
1269                                 }
1270                         }
1271                         udf_release_data(bh);
1272                 }
1273         }
1274
1275         return 0;
1276 }
1277
1278 /*
1279  * udf_check_valid()
1280  */
1281 static int
1282 udf_check_valid(struct super_block *sb, int novrs, int silent)
1283 {
1284         long block;
1285
1286         if (novrs)
1287         {
1288                 udf_debug("Validity check skipped because of novrs option\n");
1289                 return 0;
1290         }
1291         /* Check that it is NSR02 compliant */
1292         /* Process any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
1293         else if ((block = udf_vrs(sb, silent)) == -1)
1294         {
1295                 udf_debug("Failed to read byte 32768. Assuming open disc. Skipping validity check\n");
1296                 if (!UDF_SB_LASTBLOCK(sb))
1297                         UDF_SB_LASTBLOCK(sb) = udf_get_last_block(sb);
1298                 return 0;
1299         }
1300         else
1301                 return !block;
1302 }
1303
1304 static int
1305 udf_load_partition(struct super_block *sb, kernel_lb_addr *fileset)
1306 {
1307         struct anchorVolDescPtr *anchor;
1308         uint16_t ident;
1309         struct buffer_head *bh;
1310         long main_s, main_e, reserve_s, reserve_e;
1311         int i, j;
1312
1313         if (!sb)
1314                 return 1;
1315
1316         for (i=0; i<sizeof(UDF_SB_ANCHOR(sb))/sizeof(int); i++)
1317         {
1318                 if (UDF_SB_ANCHOR(sb)[i] && (bh = udf_read_tagged(sb,
1319                         UDF_SB_ANCHOR(sb)[i], UDF_SB_ANCHOR(sb)[i], &ident)))
1320                 {
1321                         anchor = (struct anchorVolDescPtr *)bh->b_data;
1322
1323                         /* Locate the main sequence */
1324                         main_s = le32_to_cpu( anchor->mainVolDescSeqExt.extLocation );
1325                         main_e = le32_to_cpu( anchor->mainVolDescSeqExt.extLength );
1326                         main_e = main_e >> sb->s_blocksize_bits;
1327                         main_e += main_s;
1328
1329                         /* Locate the reserve sequence */
1330                         reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1331                         reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1332                         reserve_e = reserve_e >> sb->s_blocksize_bits;
1333                         reserve_e += reserve_s;
1334
1335                         udf_release_data(bh);
1336
1337                         /* Process the main & reserve sequences */
1338                         /* responsible for finding the PartitionDesc(s) */
1339                         if (!(udf_process_sequence(sb, main_s, main_e, fileset) &&
1340                                 udf_process_sequence(sb, reserve_s, reserve_e, fileset)))
1341                         {
1342                                 break;
1343                         }
1344                 }
1345         }
1346
1347         if (i == sizeof(UDF_SB_ANCHOR(sb))/sizeof(int))
1348         {
1349                 udf_debug("No Anchor block found\n");
1350                 return 1;
1351         }
1352         else
1353                 udf_debug("Using anchor in block %d\n", UDF_SB_ANCHOR(sb)[i]);
1354
1355         for (i=0; i<UDF_SB_NUMPARTS(sb); i++)
1356         {
1357                 switch UDF_SB_PARTTYPE(sb, i)
1358                 {
1359                         case UDF_VIRTUAL_MAP15:
1360                         case UDF_VIRTUAL_MAP20:
1361                         {
1362                                 kernel_lb_addr ino;
1363
1364                                 if (!UDF_SB_LASTBLOCK(sb))
1365                                 {
1366                                         UDF_SB_LASTBLOCK(sb) = udf_get_last_block(sb);
1367                                         udf_find_anchor(sb);
1368                                 }
1369
1370                                 if (!UDF_SB_LASTBLOCK(sb))
1371                                 {
1372                                         udf_debug("Unable to determine Lastblock (For Virtual Partition)\n");
1373                                         return 1;
1374                                 }
1375
1376                                 for (j=0; j<UDF_SB_NUMPARTS(sb); j++)
1377                                 {
1378                                         if (j != i &&
1379                                                 UDF_SB_PARTVSN(sb,i) == UDF_SB_PARTVSN(sb,j) &&
1380                                                 UDF_SB_PARTNUM(sb,i) == UDF_SB_PARTNUM(sb,j))
1381                                         {
1382                                                 ino.partitionReferenceNum = j;
1383                                                 ino.logicalBlockNum = UDF_SB_LASTBLOCK(sb) -
1384                                                         UDF_SB_PARTROOT(sb,j);
1385                                                 break;
1386                                         }
1387                                 }
1388
1389                                 if (j == UDF_SB_NUMPARTS(sb))
1390                                         return 1;
1391
1392                                 if (!(UDF_SB_VAT(sb) = udf_iget(sb, ino)))
1393                                         return 1;
1394
1395                                 if (UDF_SB_PARTTYPE(sb,i) == UDF_VIRTUAL_MAP15)
1396                                 {
1397                                         UDF_SB_TYPEVIRT(sb,i).s_start_offset = udf_ext0_offset(UDF_SB_VAT(sb));
1398                                         UDF_SB_TYPEVIRT(sb,i).s_num_entries = (UDF_SB_VAT(sb)->i_size - 36) >> 2;
1399                                 }
1400                                 else if (UDF_SB_PARTTYPE(sb,i) == UDF_VIRTUAL_MAP20)
1401                                 {
1402                                         struct buffer_head *bh = NULL;
1403                                         uint32_t pos;
1404
1405                                         pos = udf_block_map(UDF_SB_VAT(sb), 0);
1406                                         bh = sb_bread(sb, pos);
1407                                         UDF_SB_TYPEVIRT(sb,i).s_start_offset =
1408                                                 le16_to_cpu(((struct virtualAllocationTable20 *)bh->b_data + udf_ext0_offset(UDF_SB_VAT(sb)))->lengthHeader) +
1409                                                         udf_ext0_offset(UDF_SB_VAT(sb));
1410                                         UDF_SB_TYPEVIRT(sb,i).s_num_entries = (UDF_SB_VAT(sb)->i_size -
1411                                                 UDF_SB_TYPEVIRT(sb,i).s_start_offset) >> 2;
1412                                         udf_release_data(bh);
1413                                 }
1414                                 UDF_SB_PARTROOT(sb,i) = udf_get_pblock(sb, 0, i, 0);
1415                                 UDF_SB_PARTLEN(sb,i) = UDF_SB_PARTLEN(sb,ino.partitionReferenceNum);
1416                         }
1417                 }
1418         }
1419         return 0;
1420 }
1421
1422 static void udf_open_lvid(struct super_block *sb)
1423 {
1424         if (UDF_SB_LVIDBH(sb))
1425         {
1426                 int i;
1427                 kernel_timestamp cpu_time;
1428
1429                 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1430                 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1431                 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
1432                         UDF_SB_LVID(sb)->recordingDateAndTime = cpu_to_lets(cpu_time);
1433                 UDF_SB_LVID(sb)->integrityType = LVID_INTEGRITY_TYPE_OPEN;
1434
1435                 UDF_SB_LVID(sb)->descTag.descCRC =
1436                         cpu_to_le16(udf_crc((char *)UDF_SB_LVID(sb) + sizeof(tag),
1437                         le16_to_cpu(UDF_SB_LVID(sb)->descTag.descCRCLength), 0));
1438
1439                 UDF_SB_LVID(sb)->descTag.tagChecksum = 0;
1440                 for (i=0; i<16; i++)
1441                         if (i != 4)
1442                                 UDF_SB_LVID(sb)->descTag.tagChecksum +=
1443                                         ((uint8_t *)&(UDF_SB_LVID(sb)->descTag))[i];
1444
1445                 mark_buffer_dirty(UDF_SB_LVIDBH(sb));
1446         }
1447 }
1448
1449 static void udf_close_lvid(struct super_block *sb)
1450 {
1451         if (UDF_SB_LVIDBH(sb) &&
1452                 UDF_SB_LVID(sb)->integrityType == LVID_INTEGRITY_TYPE_OPEN)
1453         {
1454                 int i;
1455                 kernel_timestamp cpu_time;
1456
1457                 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1458                 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1459                 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
1460                         UDF_SB_LVID(sb)->recordingDateAndTime = cpu_to_lets(cpu_time);
1461                 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(UDF_SB_LVIDIU(sb)->maxUDFWriteRev))
1462                         UDF_SB_LVIDIU(sb)->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1463                 if (UDF_SB_UDFREV(sb) > le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev))
1464                         UDF_SB_LVIDIU(sb)->minUDFReadRev = cpu_to_le16(UDF_SB_UDFREV(sb));
1465                 if (UDF_SB_UDFREV(sb) > le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev))
1466                         UDF_SB_LVIDIU(sb)->minUDFWriteRev = cpu_to_le16(UDF_SB_UDFREV(sb));
1467                 UDF_SB_LVID(sb)->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1468
1469                 UDF_SB_LVID(sb)->descTag.descCRC =
1470                         cpu_to_le16(udf_crc((char *)UDF_SB_LVID(sb) + sizeof(tag),
1471                         le16_to_cpu(UDF_SB_LVID(sb)->descTag.descCRCLength), 0));
1472
1473                 UDF_SB_LVID(sb)->descTag.tagChecksum = 0;
1474                 for (i=0; i<16; i++)
1475                         if (i != 4)
1476                                 UDF_SB_LVID(sb)->descTag.tagChecksum +=
1477                                         ((uint8_t *)&(UDF_SB_LVID(sb)->descTag))[i];
1478
1479                 mark_buffer_dirty(UDF_SB_LVIDBH(sb));
1480         }
1481 }
1482
1483 /*
1484  * udf_read_super
1485  *
1486  * PURPOSE
1487  *      Complete the specified super block.
1488  *
1489  * PRE-CONDITIONS
1490  *      sb                      Pointer to superblock to complete - never NULL.
1491  *      sb->s_dev               Device to read suberblock from.
1492  *      options                 Pointer to mount options.
1493  *      silent                  Silent flag.
1494  *
1495  * HISTORY
1496  *      July 1, 1997 - Andrew E. Mileski
1497  *      Written, tested, and released.
1498  */
1499 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1500 {
1501         int i;
1502         struct inode *inode=NULL;
1503         struct udf_options uopt;
1504         kernel_lb_addr rootdir, fileset;
1505         struct udf_sb_info *sbi;
1506
1507         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1508         uopt.uid = -1;
1509         uopt.gid = -1;
1510         uopt.umask = 0;
1511
1512         sbi = kmalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1513         if (!sbi)
1514                 return -ENOMEM;
1515         sb->s_fs_info = sbi;
1516         memset(UDF_SB(sb), 0x00, sizeof(struct udf_sb_info));
1517
1518         init_MUTEX(&sbi->s_alloc_sem);
1519
1520         if (!udf_parse_options((char *)options, &uopt))
1521                 goto error_out;
1522
1523         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1524             uopt.flags & (1 << UDF_FLAG_NLS_MAP))
1525         {
1526                 udf_error(sb, "udf_read_super",
1527                         "utf8 cannot be combined with iocharset\n");
1528                 goto error_out;
1529         }
1530 #ifdef CONFIG_UDF_NLS
1531         if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map)
1532         {
1533                 uopt.nls_map = load_nls_default();
1534                 if (!uopt.nls_map)
1535                         uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1536                 else
1537                         udf_debug("Using default NLS map\n");
1538         }
1539 #endif
1540         if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1541                 uopt.flags |= (1 << UDF_FLAG_UTF8);
1542
1543         fileset.logicalBlockNum = 0xFFFFFFFF;
1544         fileset.partitionReferenceNum = 0xFFFF;
1545
1546         UDF_SB(sb)->s_flags = uopt.flags;
1547         UDF_SB(sb)->s_uid = uopt.uid;
1548         UDF_SB(sb)->s_gid = uopt.gid;
1549         UDF_SB(sb)->s_umask = uopt.umask;
1550         UDF_SB(sb)->s_nls_map = uopt.nls_map;
1551
1552         /* Set the block size for all transfers */
1553         if (!udf_set_blocksize(sb, uopt.blocksize))
1554                 goto error_out;
1555
1556         if ( uopt.session == 0xFFFFFFFF )
1557                 UDF_SB_SESSION(sb) = udf_get_last_session(sb);
1558         else
1559                 UDF_SB_SESSION(sb) = uopt.session;
1560
1561         udf_debug("Multi-session=%d\n", UDF_SB_SESSION(sb));
1562
1563         UDF_SB_LASTBLOCK(sb) = uopt.lastblock;
1564         UDF_SB_ANCHOR(sb)[0] = UDF_SB_ANCHOR(sb)[1] = 0;
1565         UDF_SB_ANCHOR(sb)[2] = uopt.anchor;
1566         UDF_SB_ANCHOR(sb)[3] = 256;
1567
1568         if (udf_check_valid(sb, uopt.novrs, silent)) /* read volume recognition sequences */
1569         {
1570                 printk("UDF-fs: No VRS found\n");
1571                 goto error_out;
1572         }
1573
1574         udf_find_anchor(sb);
1575
1576         /* Fill in the rest of the superblock */
1577         sb->s_op = &udf_sb_ops;
1578         sb->dq_op = NULL;
1579         sb->s_dirt = 0;
1580         sb->s_magic = UDF_SUPER_MAGIC;
1581         sb->s_time_gran = 1000;
1582
1583         if (udf_load_partition(sb, &fileset))
1584         {
1585                 printk("UDF-fs: No partition found (1)\n");
1586                 goto error_out;
1587         }
1588
1589         udf_debug("Lastblock=%d\n", UDF_SB_LASTBLOCK(sb));
1590
1591         if ( UDF_SB_LVIDBH(sb) )
1592         {
1593                 uint16_t minUDFReadRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev);
1594                 uint16_t minUDFWriteRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev);
1595                 /* uint16_t maxUDFWriteRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->maxUDFWriteRev); */
1596
1597                 if (minUDFReadRev > UDF_MAX_READ_VERSION)
1598                 {
1599                         printk("UDF-fs: minUDFReadRev=%x (max is %x)\n",
1600                                 le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev),
1601                                 UDF_MAX_READ_VERSION);
1602                         goto error_out;
1603                 }
1604                 else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
1605                 {
1606                         sb->s_flags |= MS_RDONLY;
1607                 }
1608
1609                 UDF_SB_UDFREV(sb) = minUDFWriteRev;
1610
1611                 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1612                         UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
1613                 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
1614                         UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
1615         }
1616
1617         if ( !UDF_SB_NUMPARTS(sb) )
1618         {
1619                 printk("UDF-fs: No partition found (2)\n");
1620                 goto error_out;
1621         }
1622
1623         if ( udf_find_fileset(sb, &fileset, &rootdir) )
1624         {
1625                 printk("UDF-fs: No fileset found\n");
1626                 goto error_out;
1627         }
1628
1629         if (!silent)
1630         {
1631                 kernel_timestamp ts;
1632                 udf_time_to_stamp(&ts, UDF_SB_RECORDTIME(sb));
1633                 udf_info("UDF %s (%s) Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
1634                         UDFFS_VERSION, UDFFS_DATE,
1635                         UDF_SB_VOLIDENT(sb), ts.year, ts.month, ts.day, ts.hour, ts.minute,
1636                         ts.typeAndTimezone);
1637         }
1638         if (!(sb->s_flags & MS_RDONLY))
1639                 udf_open_lvid(sb);
1640
1641         /* Assign the root inode */
1642         /* assign inodes by physical block number */
1643         /* perhaps it's not extensible enough, but for now ... */
1644         inode = udf_iget(sb, rootdir);
1645         if (!inode)
1646         {
1647                 printk("UDF-fs: Error in udf_iget, block=%d, partition=%d\n",
1648                         rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
1649                 goto error_out;
1650         }
1651
1652         /* Allocate a dentry for the root inode */
1653         sb->s_root = d_alloc_root(inode);
1654         if (!sb->s_root)
1655         {
1656                 printk("UDF-fs: Couldn't allocate root dentry\n");
1657                 iput(inode);
1658                 goto error_out;
1659         }
1660         sb->s_maxbytes = MAX_LFS_FILESIZE;
1661         return 0;
1662
1663 error_out:
1664         if (UDF_SB_VAT(sb))
1665                 iput(UDF_SB_VAT(sb));
1666         if (UDF_SB_NUMPARTS(sb))
1667         {
1668                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1669                         iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1670                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1671                         iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1672                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1673                         UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_uspace);
1674                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1675                         UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_fspace);
1676                 if (UDF_SB_PARTTYPE(sb, UDF_SB_PARTITION(sb)) == UDF_SPARABLE_MAP15)
1677                 {
1678                         for (i=0; i<4; i++)
1679                                 udf_release_data(UDF_SB_TYPESPAR(sb, UDF_SB_PARTITION(sb)).s_spar_map[i]);
1680                 }
1681         }
1682 #ifdef CONFIG_UDF_NLS
1683         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1684                 unload_nls(UDF_SB(sb)->s_nls_map);
1685 #endif
1686         if (!(sb->s_flags & MS_RDONLY))
1687                 udf_close_lvid(sb);
1688         udf_release_data(UDF_SB_LVIDBH(sb));
1689         UDF_SB_FREE(sb);
1690         kfree(sbi);
1691         sb->s_fs_info = NULL;
1692         return -EINVAL;
1693 }
1694
1695 void udf_error(struct super_block *sb, const char *function,
1696         const char *fmt, ...)
1697 {
1698         va_list args;
1699
1700         if (!(sb->s_flags & MS_RDONLY))
1701         {
1702                 /* mark sb error */
1703                 sb->s_dirt = 1;
1704         }
1705         va_start(args, fmt);
1706         vsprintf(error_buf, fmt, args);
1707         va_end(args);
1708         printk (KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
1709                 sb->s_id, function, error_buf);
1710 }
1711
1712 void udf_warning(struct super_block *sb, const char *function,
1713         const char *fmt, ...)
1714 {
1715         va_list args;
1716
1717         va_start (args, fmt);
1718         vsprintf(error_buf, fmt, args);
1719         va_end(args);
1720         printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
1721                 sb->s_id, function, error_buf);
1722 }
1723
1724 /*
1725  * udf_put_super
1726  *
1727  * PURPOSE
1728  *      Prepare for destruction of the superblock.
1729  *
1730  * DESCRIPTION
1731  *      Called before the filesystem is unmounted.
1732  *
1733  * HISTORY
1734  *      July 1, 1997 - Andrew E. Mileski
1735  *      Written, tested, and released.
1736  */
1737 static void
1738 udf_put_super(struct super_block *sb)
1739 {
1740         int i;
1741
1742         if (UDF_SB_VAT(sb))
1743                 iput(UDF_SB_VAT(sb));
1744         if (UDF_SB_NUMPARTS(sb))
1745         {
1746                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1747                         iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1748                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1749                         iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1750                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1751                         UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_uspace);
1752                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1753                         UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_fspace);
1754                 if (UDF_SB_PARTTYPE(sb, UDF_SB_PARTITION(sb)) == UDF_SPARABLE_MAP15)
1755                 {
1756                         for (i=0; i<4; i++)
1757                                 udf_release_data(UDF_SB_TYPESPAR(sb, UDF_SB_PARTITION(sb)).s_spar_map[i]);
1758                 }
1759         }
1760 #ifdef CONFIG_UDF_NLS
1761         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1762                 unload_nls(UDF_SB(sb)->s_nls_map);
1763 #endif
1764         if (!(sb->s_flags & MS_RDONLY))
1765                 udf_close_lvid(sb);
1766         udf_release_data(UDF_SB_LVIDBH(sb));
1767         UDF_SB_FREE(sb);
1768         kfree(sb->s_fs_info);
1769         sb->s_fs_info = NULL;
1770 }
1771
1772 /*
1773  * udf_stat_fs
1774  *
1775  * PURPOSE
1776  *      Return info about the filesystem.
1777  *
1778  * DESCRIPTION
1779  *      Called by sys_statfs()
1780  *
1781  * HISTORY
1782  *      July 1, 1997 - Andrew E. Mileski
1783  *      Written, tested, and released.
1784  */
1785 static int
1786 udf_statfs(struct super_block *sb, struct kstatfs *buf)
1787 {
1788         buf->f_type = UDF_SUPER_MAGIC;
1789         buf->f_bsize = sb->s_blocksize;
1790         buf->f_blocks = UDF_SB_PARTLEN(sb, UDF_SB_PARTITION(sb));
1791         buf->f_bfree = udf_count_free(sb);
1792         buf->f_bavail = buf->f_bfree;
1793         buf->f_files = (UDF_SB_LVIDBH(sb) ?
1794                 (le32_to_cpu(UDF_SB_LVIDIU(sb)->numFiles) +
1795                 le32_to_cpu(UDF_SB_LVIDIU(sb)->numDirs)) : 0) + buf->f_bfree;
1796         buf->f_ffree = buf->f_bfree;
1797         /* __kernel_fsid_t f_fsid */
1798         buf->f_namelen = UDF_NAME_LEN-2;
1799
1800         return 0;
1801 }
1802
1803 static unsigned char udf_bitmap_lookup[16] = {
1804         0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4
1805 };
1806
1807 static unsigned int
1808 udf_count_free_bitmap(struct super_block *sb, struct udf_bitmap *bitmap)
1809 {
1810         struct buffer_head *bh = NULL;
1811         unsigned int accum = 0;
1812         int index;
1813         int block = 0, newblock;
1814         kernel_lb_addr loc;
1815         uint32_t bytes;
1816         uint8_t value;
1817         uint8_t *ptr;
1818         uint16_t ident;
1819         struct spaceBitmapDesc *bm;
1820
1821         lock_kernel();
1822
1823         loc.logicalBlockNum = bitmap->s_extPosition;
1824         loc.partitionReferenceNum = UDF_SB_PARTITION(sb);
1825         bh = udf_read_ptagged(sb, loc, 0, &ident);
1826
1827         if (!bh)
1828         {
1829                 printk(KERN_ERR "udf: udf_count_free failed\n");
1830                 goto out;
1831         }
1832         else if (ident != TAG_IDENT_SBD)
1833         {
1834                 udf_release_data(bh);
1835                 printk(KERN_ERR "udf: udf_count_free failed\n");
1836                 goto out;
1837         }
1838
1839         bm = (struct spaceBitmapDesc *)bh->b_data;
1840         bytes = le32_to_cpu(bm->numOfBytes);
1841         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
1842         ptr = (uint8_t *)bh->b_data;
1843
1844         while ( bytes > 0 )
1845         {
1846                 while ((bytes > 0) && (index < sb->s_blocksize))
1847                 {
1848                         value = ptr[index];
1849                         accum += udf_bitmap_lookup[ value & 0x0f ];
1850                         accum += udf_bitmap_lookup[ value >> 4 ];
1851                         index++;
1852                         bytes--;
1853                 }
1854                 if ( bytes )
1855                 {
1856                         udf_release_data(bh);
1857                         newblock = udf_get_lb_pblock(sb, loc, ++block);
1858                         bh = udf_tread(sb, newblock);
1859                         if (!bh)
1860                         {
1861                                 udf_debug("read failed\n");
1862                                 goto out;
1863                         }
1864                         index = 0;
1865                         ptr = (uint8_t *)bh->b_data;
1866                 }
1867         }
1868         udf_release_data(bh);
1869
1870 out:
1871         unlock_kernel();
1872
1873         return accum;
1874 }
1875
1876 static unsigned int
1877 udf_count_free_table(struct super_block *sb, struct inode * table)
1878 {
1879         unsigned int accum = 0;
1880         uint32_t extoffset, elen;
1881         kernel_lb_addr bloc, eloc;
1882         int8_t etype;
1883         struct buffer_head *bh = NULL;
1884
1885         lock_kernel();
1886
1887         bloc = UDF_I_LOCATION(table);
1888         extoffset = sizeof(struct unallocSpaceEntry);
1889
1890         while ((etype = udf_next_aext(table, &bloc, &extoffset, &eloc, &elen, &bh, 1)) != -1)
1891         {
1892                 accum += (elen >> table->i_sb->s_blocksize_bits);
1893         }
1894         udf_release_data(bh);
1895
1896         unlock_kernel();
1897
1898         return accum;
1899 }
1900
1901 static unsigned int
1902 udf_count_free(struct super_block *sb)
1903 {
1904         unsigned int accum = 0;
1905
1906         if (UDF_SB_LVIDBH(sb))
1907         {
1908                 if (le32_to_cpu(UDF_SB_LVID(sb)->numOfPartitions) > UDF_SB_PARTITION(sb))
1909                 {
1910                         accum = le32_to_cpu(UDF_SB_LVID(sb)->freeSpaceTable[UDF_SB_PARTITION(sb)]);
1911
1912                         if (accum == 0xFFFFFFFF)
1913                                 accum = 0;
1914                 }
1915         }
1916
1917         if (accum)
1918                 return accum;
1919
1920         if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1921         {
1922                 accum += udf_count_free_bitmap(sb,
1923                         UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_bitmap);
1924         }
1925         if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1926         {
1927                 accum += udf_count_free_bitmap(sb,
1928                         UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_bitmap);
1929         }
1930         if (accum)
1931                 return accum;
1932
1933         if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1934         {
1935                 accum += udf_count_free_table(sb,
1936                         UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1937         }
1938         if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1939         {
1940                 accum += udf_count_free_table(sb,
1941                         UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1942         }
1943
1944         return accum;
1945 }