fs/udf/super.c

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