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/blkdev.h>
  44 #include <linux/slab.h>
  45 #include <linux/kernel.h>
  46 #include <linux/module.h>
  47 #include <linux/parser.h>
  48 #include <linux/stat.h>
  49 #include <linux/cdrom.h>
  50 #include <linux/nls.h>
  51 #include <linux/smp_lock.h>
  52 #include <linux/buffer_head.h>
  53 #include <linux/vfs.h>
  54 #include <linux/vmalloc.h>
  55 #include <asm/byteorder.h>
  56
  57 #include <linux/udf_fs.h>
  58 #include "udf_sb.h"
  59 #include "udf_i.h"
  60
  61 #include <linux/init.h>
  62 #include <asm/uaccess.h>
  63
  64 #define VDS_POS_PRIMARY_VOL_DESC        0
  65 #define VDS_POS_UNALLOC_SPACE_DESC      1
  66 #define VDS_POS_LOGICAL_VOL_DESC        2
  67 #define VDS_POS_PARTITION_DESC          3
  68 #define VDS_POS_IMP_USE_VOL_DESC        4
  69 #define VDS_POS_VOL_DESC_PTR            5
  70 #define VDS_POS_TERMINATING_DESC        6
  71 #define VDS_POS_LENGTH                  7
  72
  73 static char error_buf[1024];
  74
  75 /* These are the "meat" - everything else is stuffing */
  76 static int udf_fill_super(struct super_block *, void *, int);
  77 static void udf_put_super(struct super_block *);
  78 static void udf_write_super(struct super_block *);
  79 static int udf_remount_fs(struct super_block *, int *, char *);
  80 static int udf_check_valid(struct super_block *, int, int);
  81 static int udf_vrs(struct super_block *sb, int silent);
  82 static int udf_load_partition(struct super_block *, kernel_lb_addr *);
  83 static int udf_load_logicalvol(struct super_block *, struct buffer_head *,
  84                                kernel_lb_addr *);
  85 static void udf_load_logicalvolint(struct super_block *, kernel_extent_ad);
  86 static void udf_find_anchor(struct super_block *);
  87 static int udf_find_fileset(struct super_block *, kernel_lb_addr *,
  88                             kernel_lb_addr *);
  89 static void udf_load_pvoldesc(struct super_block *, struct buffer_head *);
  90 static void udf_load_fileset(struct super_block *, struct buffer_head *,
  91                              kernel_lb_addr *);
  92 static void udf_load_partdesc(struct super_block *, struct buffer_head *);
  93 static void udf_open_lvid(struct super_block *);
  94 static void udf_close_lvid(struct super_block *);
  95 static unsigned int udf_count_free(struct super_block *);
  96 static int udf_statfs(struct dentry *, struct kstatfs *);
  97
  98 /* UDF filesystem type */
  99 static int udf_get_sb(struct file_system_type *fs_type,
 100                       int flags, const char *dev_name, void *data,
 101                       struct vfsmount *mnt)
 102 {
 103         return get_sb_bdev(fs_type, flags, dev_name, data, udf_fill_super, mnt);
 104 }
 105
 106 static struct file_system_type udf_fstype = {
 107         .owner          = THIS_MODULE,
 108         .name           = "udf",
 109         .get_sb         = udf_get_sb,
 110         .kill_sb        = kill_block_super,
 111         .fs_flags       = FS_REQUIRES_DEV,
 112 };
 113
 114 static struct kmem_cache *udf_inode_cachep;
 115
 116 static struct inode *udf_alloc_inode(struct super_block *sb)
 117 {
 118         struct udf_inode_info *ei;
 119         ei = (struct udf_inode_info *)kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
 120         if (!ei)
 121                 return NULL;
 122
 123         ei->i_unique = 0;
 124         ei->i_lenExtents = 0;
 125         ei->i_next_alloc_block = 0;
 126         ei->i_next_alloc_goal = 0;
 127         ei->i_strat4096 = 0;
 128
 129         return &ei->vfs_inode;
 130 }
 131
 132 static void udf_destroy_inode(struct inode *inode)
 133 {
 134         kmem_cache_free(udf_inode_cachep, UDF_I(inode));
 135 }
 136
 137 static void init_once(void *foo, struct kmem_cache *cachep, unsigned long flags)
 138 {
 139         struct udf_inode_info *ei = (struct udf_inode_info *)foo;
 140
 141         ei->i_ext.i_data = NULL;
 142         inode_init_once(&ei->vfs_inode);
 143 }
 144
 145 static int init_inodecache(void)
 146 {
 147         udf_inode_cachep = kmem_cache_create("udf_inode_cache",
 148                                              sizeof(struct udf_inode_info),
 149                                              0, (SLAB_RECLAIM_ACCOUNT |
 150                                                  SLAB_MEM_SPREAD),
 151                                              init_once);
 152         if (!udf_inode_cachep)
 153                 return -ENOMEM;
 154         return 0;
 155 }
 156
 157 static void destroy_inodecache(void)
 158 {
 159         kmem_cache_destroy(udf_inode_cachep);
 160 }
 161
 162 /* Superblock operations */
 163 static const struct super_operations udf_sb_ops = {
 164         .alloc_inode    = udf_alloc_inode,
 165         .destroy_inode  = udf_destroy_inode,
 166         .write_inode    = udf_write_inode,
 167         .delete_inode   = udf_delete_inode,
 168         .clear_inode    = udf_clear_inode,
 169         .put_super      = udf_put_super,
 170         .write_super    = udf_write_super,
 171         .statfs         = udf_statfs,
 172         .remount_fs     = udf_remount_fs,
 173 };
 174
 175 struct udf_options {
 176         unsigned char novrs;
 177         unsigned int blocksize;
 178         unsigned int session;
 179         unsigned int lastblock;
 180         unsigned int anchor;
 181         unsigned int volume;
 182         unsigned short partition;
 183         unsigned int fileset;
 184         unsigned int rootdir;
 185         unsigned int flags;
 186         mode_t umask;
 187         gid_t gid;
 188         uid_t uid;
 189         struct nls_table *nls_map;
 190 };
 191
 192 static int __init init_udf_fs(void)
 193 {
 194         int err;
 195
 196         err = init_inodecache();
 197         if (err)
 198                 goto out1;
 199         err = register_filesystem(&udf_fstype);
 200         if (err)
 201                 goto out;
 202
 203         return 0;
 204
 205 out:
 206         destroy_inodecache();
 207
 208 out1:
 209         return err;
 210 }
 211
 212 static void __exit exit_udf_fs(void)
 213 {
 214         unregister_filesystem(&udf_fstype);
 215         destroy_inodecache();
 216 }
 217
 218 module_init(init_udf_fs)
 219 module_exit(exit_udf_fs)
 220
 221 /*
 222  * udf_parse_options
 223  *
 224  * PURPOSE
 225  *      Parse mount options.
 226  *
 227  * DESCRIPTION
 228  *      The following mount options are supported:
 229  *
 230  *      gid=            Set the default group.
 231  *      umask=          Set the default umask.
 232  *      uid=            Set the default user.
 233  *      bs=             Set the block size.
 234  *      unhide          Show otherwise hidden files.
 235  *      undelete        Show deleted files in lists.
 236  *      adinicb         Embed data in the inode (default)
 237  *      noadinicb       Don't embed data in the inode
 238  *      shortad         Use short ad's
 239  *      longad          Use long ad's (default)
 240  *      nostrict        Unset strict conformance
 241  *      iocharset=      Set the NLS character set
 242  *
 243  *      The remaining are for debugging and disaster recovery:
 244  *
 245  *      novrs           Skip volume sequence recognition
 246  *
 247  *      The following expect a offset from 0.
 248  *
 249  *      session=        Set the CDROM session (default= last session)
 250  *      anchor=         Override standard anchor location. (default= 256)
 251  *      volume=         Override the VolumeDesc location. (unused)
 252  *      partition=      Override the PartitionDesc location. (unused)
 253  *      lastblock=      Set the last block of the filesystem/
 254  *
 255  *      The following expect a offset from the partition root.
 256  *
 257  *      fileset=        Override the fileset block location. (unused)
 258  *      rootdir=        Override the root directory location. (unused)
 259  *              WARNING: overriding the rootdir to a non-directory may
 260  *              yield highly unpredictable results.
 261  *
 262  * PRE-CONDITIONS
 263  *      options         Pointer to mount options string.
 264  *      uopts           Pointer to mount options variable.
 265  *
 266  * POST-CONDITIONS
 267  *      <return>        1       Mount options parsed okay.
 268  *      <return>        0       Error parsing mount options.
 269  *
 270  * HISTORY
 271  *      July 1, 1997 - Andrew E. Mileski
 272  *      Written, tested, and released.
 273  */
 274
 275 enum {
 276         Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
 277         Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
 278         Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
 279         Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
 280         Opt_rootdir, Opt_utf8, Opt_iocharset,
 281         Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore
 282 };
 283
 284 static match_table_t tokens = {
 285         {Opt_novrs,     "novrs"},
 286         {Opt_nostrict,  "nostrict"},
 287         {Opt_bs,        "bs=%u"},
 288         {Opt_unhide,    "unhide"},
 289         {Opt_undelete,  "undelete"},
 290         {Opt_noadinicb, "noadinicb"},
 291         {Opt_adinicb,   "adinicb"},
 292         {Opt_shortad,   "shortad"},
 293         {Opt_longad,    "longad"},
 294         {Opt_uforget,   "uid=forget"},
 295         {Opt_uignore,   "uid=ignore"},
 296         {Opt_gforget,   "gid=forget"},
 297         {Opt_gignore,   "gid=ignore"},
 298         {Opt_gid,       "gid=%u"},
 299         {Opt_uid,       "uid=%u"},
 300         {Opt_umask,     "umask=%o"},
 301         {Opt_session,   "session=%u"},
 302         {Opt_lastblock, "lastblock=%u"},
 303         {Opt_anchor,    "anchor=%u"},
 304         {Opt_volume,    "volume=%u"},
 305         {Opt_partition, "partition=%u"},
 306         {Opt_fileset,   "fileset=%u"},
 307         {Opt_rootdir,   "rootdir=%u"},
 308         {Opt_utf8,      "utf8"},
 309         {Opt_iocharset, "iocharset=%s"},
 310         {Opt_err,       NULL}
 311 };
 312
 313 static int udf_parse_options(char *options, struct udf_options *uopt)
 314 {
 315         char *p;
 316         int option;
 317
 318         uopt->novrs = 0;
 319         uopt->blocksize = 2048;
 320         uopt->partition = 0xFFFF;
 321         uopt->session = 0xFFFFFFFF;
 322         uopt->lastblock = 0;
 323         uopt->anchor = 0;
 324         uopt->volume = 0xFFFFFFFF;
 325         uopt->rootdir = 0xFFFFFFFF;
 326         uopt->fileset = 0xFFFFFFFF;
 327         uopt->nls_map = NULL;
 328
 329         if (!options)
 330                 return 1;
 331
 332         while ((p = strsep(&options, ",")) != NULL) {
 333                 substring_t args[MAX_OPT_ARGS];
 334                 int token;
 335                 if (!*p)
 336                         continue;
 337
 338                 token = match_token(p, tokens, args);
 339                 switch (token) {
 340                 case Opt_novrs:
 341                         uopt->novrs = 1;
 342                 case Opt_bs:
 343                         if (match_int(&args[0], &option))
 344                                 return 0;
 345                         uopt->blocksize = option;
 346                         break;
 347                 case Opt_unhide:
 348                         uopt->flags |= (1 << UDF_FLAG_UNHIDE);
 349                         break;
 350                 case Opt_undelete:
 351                         uopt->flags |= (1 << UDF_FLAG_UNDELETE);
 352                         break;
 353                 case Opt_noadinicb:
 354                         uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
 355                         break;
 356                 case Opt_adinicb:
 357                         uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
 358                         break;
 359                 case Opt_shortad:
 360                         uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
 361                         break;
 362                 case Opt_longad:
 363                         uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
 364                         break;
 365                 case Opt_gid:
 366                         if (match_int(args, &option))
 367                                 return 0;
 368                         uopt->gid = option;
 369                         break;
 370                 case Opt_uid:
 371                         if (match_int(args, &option))
 372                                 return 0;
 373                         uopt->uid = option;
 374                         break;
 375                 case Opt_umask:
 376                         if (match_octal(args, &option))
 377                                 return 0;
 378                         uopt->umask = option;
 379                         break;
 380                 case Opt_nostrict:
 381                         uopt->flags &= ~(1 << UDF_FLAG_STRICT);
 382                         break;
 383                 case Opt_session:
 384                         if (match_int(args, &option))
 385                                 return 0;
 386                         uopt->session = option;
 387                         break;
 388                 case Opt_lastblock:
 389                         if (match_int(args, &option))
 390                                 return 0;
 391                         uopt->lastblock = option;
 392                         break;
 393                 case Opt_anchor:
 394                         if (match_int(args, &option))
 395                                 return 0;
 396                         uopt->anchor = option;
 397                         break;
 398                 case Opt_volume:
 399                         if (match_int(args, &option))
 400                                 return 0;
 401                         uopt->volume = option;
 402                         break;
 403                 case Opt_partition:
 404                         if (match_int(args, &option))
 405                                 return 0;
 406                         uopt->partition = option;
 407                         break;
 408                 case Opt_fileset:
 409                         if (match_int(args, &option))
 410                                 return 0;
 411                         uopt->fileset = option;
 412                         break;
 413                 case Opt_rootdir:
 414                         if (match_int(args, &option))
 415                                 return 0;
 416                         uopt->rootdir = option;
 417                         break;
 418                 case Opt_utf8:
 419                         uopt->flags |= (1 << UDF_FLAG_UTF8);
 420                         break;
 421 #ifdef CONFIG_UDF_NLS
 422                 case Opt_iocharset:
 423                         uopt->nls_map = load_nls(args[0].from);
 424                         uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
 425                         break;
 426 #endif
 427                 case Opt_uignore:
 428                         uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
 429                         break;
 430                 case Opt_uforget:
 431                         uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
 432                         break;
 433                 case Opt_gignore:
 434                         uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
 435                         break;
 436                 case Opt_gforget:
 437                         uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
 438                         break;
 439                 default:
 440                         printk(KERN_ERR "udf: bad mount option \"%s\" "
 441                                "or missing value\n", p);
 442                         return 0;
 443                 }
 444         }
 445         return 1;
 446 }
 447
 448 void udf_write_super(struct super_block *sb)
 449 {
 450         lock_kernel();
 451
 452         if (!(sb->s_flags & MS_RDONLY))
 453                 udf_open_lvid(sb);
 454         sb->s_dirt = 0;
 455
 456         unlock_kernel();
 457 }
 458
 459 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
 460 {
 461         struct udf_options uopt;
 462
 463         uopt.flags = UDF_SB(sb)->s_flags;
 464         uopt.uid   = UDF_SB(sb)->s_uid;
 465         uopt.gid   = UDF_SB(sb)->s_gid;
 466         uopt.umask = UDF_SB(sb)->s_umask;
 467
 468         if (!udf_parse_options(options, &uopt))
 469                 return -EINVAL;
 470
 471         UDF_SB(sb)->s_flags = uopt.flags;
 472         UDF_SB(sb)->s_uid   = uopt.uid;
 473         UDF_SB(sb)->s_gid   = uopt.gid;
 474         UDF_SB(sb)->s_umask = uopt.umask;
 475
 476         if (UDF_SB_LVIDBH(sb)) {
 477                 int write_rev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev);
 478                 if (write_rev > UDF_MAX_WRITE_VERSION)
 479                         *flags |= MS_RDONLY;
 480         }
 481
 482         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 483                 return 0;
 484         if (*flags & MS_RDONLY)
 485                 udf_close_lvid(sb);
 486         else
 487                 udf_open_lvid(sb);
 488
 489         return 0;
 490 }
 491
 492 /*
 493  * udf_set_blocksize
 494  *
 495  * PURPOSE
 496  *      Set the block size to be used in all transfers.
 497  *
 498  * DESCRIPTION
 499  *      To allow room for a DMA transfer, it is best to guess big when unsure.
 500  *      This routine picks 2048 bytes as the blocksize when guessing. This
 501  *      should be adequate until devices with larger block sizes become common.
 502  *
 503  *      Note that the Linux kernel can currently only deal with blocksizes of
 504  *      512, 1024, 2048, 4096, and 8192 bytes.
 505  *
 506  * PRE-CONDITIONS
 507  *      sb                      Pointer to _locked_ superblock.
 508  *
 509  * POST-CONDITIONS
 510  *      sb->s_blocksize         Blocksize.
 511  *      sb->s_blocksize_bits    log2 of blocksize.
 512  *      <return>        0       Blocksize is valid.
 513  *      <return>        1       Blocksize is invalid.
 514  *
 515  * HISTORY
 516  *      July 1, 1997 - Andrew E. Mileski
 517  *      Written, tested, and released.
 518  */
 519 static int udf_set_blocksize(struct super_block *sb, int bsize)
 520 {
 521         if (!sb_min_blocksize(sb, bsize)) {
 522                 udf_debug("Bad block size (%d)\n", bsize);
 523                 printk(KERN_ERR "udf: bad block size (%d)\n", bsize);
 524                 return 0;
 525         }
 526
 527         return sb->s_blocksize;
 528 }
 529
 530 static int udf_vrs(struct super_block *sb, int silent)
 531 {
 532         struct volStructDesc *vsd = NULL;
 533         int sector = 32768;
 534         int sectorsize;
 535         struct buffer_head *bh = NULL;
 536         int iso9660 = 0;
 537         int nsr02 = 0;
 538         int nsr03 = 0;
 539
 540         /* Block size must be a multiple of 512 */
 541         if (sb->s_blocksize & 511)
 542                 return 0;
 543
 544         if (sb->s_blocksize < sizeof(struct volStructDesc))
 545                 sectorsize = sizeof(struct volStructDesc);
 546         else
 547                 sectorsize = sb->s_blocksize;
 548
 549         sector += (UDF_SB_SESSION(sb) << sb->s_blocksize_bits);
 550
 551         udf_debug("Starting at sector %u (%ld byte sectors)\n",
 552                   (sector >> sb->s_blocksize_bits), sb->s_blocksize);
 553         /* Process the sequence (if applicable) */
 554         for (; !nsr02 && !nsr03; sector += sectorsize) {
 555                 /* Read a block */
 556                 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
 557                 if (!bh)
 558                         break;
 559
 560                 /* Look for ISO  descriptors */
 561                 vsd = (struct volStructDesc *)(bh->b_data +
 562                                                (sector & (sb->s_blocksize - 1)));
 563
 564                 if (vsd->stdIdent[0] == 0) {
 565                         brelse(bh);
 566                         break;
 567                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001, VSD_STD_ID_LEN)) {
 568                         iso9660 = sector;
 569                         switch (vsd->structType) {
 570                         case 0:
 571                                 udf_debug("ISO9660 Boot Record found\n");
 572                                 break;
 573                         case 1:
 574                                 udf_debug
 575                                     ("ISO9660 Primary Volume Descriptor found\n");
 576                                 break;
 577                         case 2:
 578                                 udf_debug
 579                                     ("ISO9660 Supplementary Volume Descriptor found\n");
 580                                 break;
 581                         case 3:
 582                                 udf_debug
 583                                     ("ISO9660 Volume Partition Descriptor found\n");
 584                                 break;
 585                         case 255:
 586                                 udf_debug
 587                                     ("ISO9660 Volume Descriptor Set Terminator found\n");
 588                                 break;
 589                         default:
 590                                 udf_debug("ISO9660 VRS (%u) found\n",
 591                                           vsd->structType);
 592                                 break;
 593                         }
 594                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01, VSD_STD_ID_LEN)) {
 595                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01, VSD_STD_ID_LEN)) {
 596                         brelse(bh);
 597                         break;
 598                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02, VSD_STD_ID_LEN)) {
 599                         nsr02 = sector;
 600                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03, VSD_STD_ID_LEN)) {
 601                         nsr03 = sector;
 602                 }
 603                 brelse(bh);
 604         }
 605
 606         if (nsr03)
 607                 return nsr03;
 608         else if (nsr02)
 609                 return nsr02;
 610         else if (sector - (UDF_SB_SESSION(sb) << sb->s_blocksize_bits) == 32768)
 611                 return -1;
 612         else
 613                 return 0;
 614 }
 615
 616 /*
 617  * udf_find_anchor
 618  *
 619  * PURPOSE
 620  *      Find an anchor volume descriptor.
 621  *
 622  * PRE-CONDITIONS
 623  *      sb                      Pointer to _locked_ superblock.
 624  *      lastblock               Last block on media.
 625  *
 626  * POST-CONDITIONS
 627  *      <return>                1 if not found, 0 if ok
 628  *
 629  * HISTORY
 630  *      July 1, 1997 - Andrew E. Mileski
 631  *      Written, tested, and released.
 632  */
 633 static void udf_find_anchor(struct super_block *sb)
 634 {
 635         int lastblock = UDF_SB_LASTBLOCK(sb);
 636         struct buffer_head *bh = NULL;
 637         uint16_t ident;
 638         uint32_t location;
 639         int i;
 640
 641         if (lastblock) {
 642                 int varlastblock = udf_variable_to_fixed(lastblock);
 643                 int last[] =  { lastblock, lastblock - 2,
 644                                 lastblock - 150, lastblock - 152,
 645                                 varlastblock, varlastblock - 2,
 646                                 varlastblock - 150, varlastblock - 152 };
 647
 648                 lastblock = 0;
 649
 650                 /* Search for an anchor volume descriptor pointer */
 651
 652                 /*  according to spec, anchor is in either:
 653                  *     block 256
 654                  *     lastblock-256
 655                  *     lastblock
 656                  *  however, if the disc isn't closed, it could be 512 */
 657
 658                 for (i = 0; !lastblock && i < ARRAY_SIZE(last); i++) {
 659                         if (last[i] < 0 || !(bh = sb_bread(sb, last[i]))) {
 660                                 ident = location = 0;
 661                         } else {
 662                                 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
 663                                 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
 664                                 brelse(bh);
 665                         }
 666
 667                         if (ident == TAG_IDENT_AVDP) {
 668                                 if (location == last[i] - UDF_SB_SESSION(sb)) {
 669                                         lastblock = UDF_SB_ANCHOR(sb)[0] = last[i] - UDF_SB_SESSION(sb);
 670                                         UDF_SB_ANCHOR(sb)[1] = last[i] - 256 - UDF_SB_SESSION(sb);
 671                                 } else if (location == udf_variable_to_fixed(last[i]) - UDF_SB_SESSION(sb)) {
 672                                         UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
 673                                         lastblock = UDF_SB_ANCHOR(sb)[0] = udf_variable_to_fixed(last[i]) - UDF_SB_SESSION(sb);
 674                                         UDF_SB_ANCHOR(sb)[1] = lastblock - 256 - UDF_SB_SESSION(sb);
 675                                 } else {
 676                                         udf_debug("Anchor found at block %d, location mismatch %d.\n",
 677                                                   last[i], location);
 678                                 }
 679                         } else if (ident == TAG_IDENT_FE || ident == TAG_IDENT_EFE) {
 680                                 lastblock = last[i];
 681                                 UDF_SB_ANCHOR(sb)[3] = 512;
 682                         } else {
 683                                 if (last[i] < 256 || !(bh = sb_bread(sb, last[i] - 256))) {
 684                                         ident = location = 0;
 685                                 } else {
 686                                         ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
 687                                         location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
 688                                         brelse(bh);
 689                                 }
 690
 691                                 if (ident == TAG_IDENT_AVDP &&
 692                                     location == last[i] - 256 - UDF_SB_SESSION(sb)) {
 693                                         lastblock = last[i];
 694                                         UDF_SB_ANCHOR(sb)[1] = last[i] - 256;
 695                                 } else {
 696                                         if (last[i] < 312 + UDF_SB_SESSION(sb) ||
 697                                             !(bh = sb_bread(sb, last[i] - 312 - UDF_SB_SESSION(sb)))) {
 698                                                 ident = location = 0;
 699                                         } else {
 700                                                 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
 701                                                 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
 702                                                 brelse(bh);
 703                                         }
 704
 705                                         if (ident == TAG_IDENT_AVDP &&
 706                                             location == udf_variable_to_fixed(last[i]) - 256) {
 707                                                 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
 708                                                 lastblock = udf_variable_to_fixed(last[i]);
 709                                                 UDF_SB_ANCHOR(sb)[1] = lastblock - 256;
 710                                         }
 711                                 }
 712                         }
 713                 }
 714         }
 715
 716         if (!lastblock) {
 717                 /* We havn't found the lastblock. check 312 */
 718                 if ((bh = sb_bread(sb, 312 + UDF_SB_SESSION(sb)))) {
 719                         ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
 720                         location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
 721                         brelse(bh);
 722
 723                         if (ident == TAG_IDENT_AVDP && location == 256)
 724                                 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
 725                 }
 726         }
 727
 728         for (i = 0; i < ARRAY_SIZE(UDF_SB_ANCHOR(sb)); i++) {
 729                 if (UDF_SB_ANCHOR(sb)[i]) {
 730                         if (!(bh = udf_read_tagged(sb, UDF_SB_ANCHOR(sb)[i],
 731                                                    UDF_SB_ANCHOR(sb)[i], &ident))) {
 732                                 UDF_SB_ANCHOR(sb)[i] = 0;
 733                         } else {
 734                                 brelse(bh);
 735                                 if ((ident != TAG_IDENT_AVDP) &&
 736                                     (i || (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE))) {
 737                                         UDF_SB_ANCHOR(sb)[i] = 0;
 738                                 }
 739                         }
 740                 }
 741         }
 742
 743         UDF_SB_LASTBLOCK(sb) = lastblock;
 744 }
 745
 746 static int udf_find_fileset(struct super_block *sb, kernel_lb_addr *fileset, kernel_lb_addr *root)
 747 {
 748         struct buffer_head *bh = NULL;
 749         long lastblock;
 750         uint16_t ident;
 751
 752         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
 753             fileset->partitionReferenceNum != 0xFFFF) {
 754                 bh = udf_read_ptagged(sb, *fileset, 0, &ident);
 755
 756                 if (!bh) {
 757                         return 1;
 758                 } else if (ident != TAG_IDENT_FSD) {
 759                         brelse(bh);
 760                         return 1;
 761                 }
 762
 763         }
 764
 765         if (!bh) { /* Search backwards through the partitions */
 766                 kernel_lb_addr newfileset;
 767
 768 /* --> cvg: FIXME - is it reasonable? */
 769                 return 1;
 770
 771                 for (newfileset.partitionReferenceNum = UDF_SB_NUMPARTS(sb) - 1;
 772                      (newfileset.partitionReferenceNum != 0xFFFF &&
 773                       fileset->logicalBlockNum == 0xFFFFFFFF &&
 774                       fileset->partitionReferenceNum == 0xFFFF);
 775                      newfileset.partitionReferenceNum--) {
 776                         lastblock = UDF_SB_PARTLEN(sb, newfileset.partitionReferenceNum);
 777                         newfileset.logicalBlockNum = 0;
 778
 779                         do {
 780                                 bh = udf_read_ptagged(sb, newfileset, 0, &ident);
 781                                 if (!bh) {
 782                                         newfileset.logicalBlockNum++;
 783                                         continue;
 784                                 }
 785
 786                                 switch (ident) {
 787                                 case TAG_IDENT_SBD:
 788                                 {
 789                                         struct spaceBitmapDesc *sp;
 790                                         sp = (struct spaceBitmapDesc *)bh->b_data;
 791                                         newfileset.logicalBlockNum += 1 +
 792                                                 ((le32_to_cpu(sp->numOfBytes) +
 793                                                   sizeof(struct spaceBitmapDesc) - 1)
 794                                                  >> sb->s_blocksize_bits);
 795                                         brelse(bh);
 796                                         break;
 797                                 }
 798                                 case TAG_IDENT_FSD:
 799                                         *fileset = newfileset;
 800                                         break;
 801                                 default:
 802                                         newfileset.logicalBlockNum++;
 803                                         brelse(bh);
 804                                         bh = NULL;
 805                                         break;
 806                                 }
 807                         } while (newfileset.logicalBlockNum < lastblock &&
 808                                  fileset->logicalBlockNum == 0xFFFFFFFF &&
 809                                  fileset->partitionReferenceNum == 0xFFFF);
 810                 }
 811         }
 812
 813         if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
 814              fileset->partitionReferenceNum != 0xFFFF) && bh) {
 815                 udf_debug("Fileset at block=%d, partition=%d\n",
 816                           fileset->logicalBlockNum,
 817                           fileset->partitionReferenceNum);
 818
 819                 UDF_SB_PARTITION(sb) = fileset->partitionReferenceNum;
 820                 udf_load_fileset(sb, bh, root);
 821                 brelse(bh);
 822                 return 0;
 823         }
 824         return 1;
 825 }
 826
 827 static void udf_load_pvoldesc(struct super_block *sb, struct buffer_head *bh)
 828 {
 829         struct primaryVolDesc *pvoldesc;
 830         time_t recording;
 831         long recording_usec;
 832         struct ustr instr;
 833         struct ustr outstr;
 834
 835         pvoldesc = (struct primaryVolDesc *)bh->b_data;
 836
 837         if (udf_stamp_to_time(&recording, &recording_usec,
 838                               lets_to_cpu(pvoldesc->recordingDateAndTime))) {
 839                 kernel_timestamp ts;
 840                 ts = lets_to_cpu(pvoldesc->recordingDateAndTime);
 841                 udf_debug("recording time %ld/%ld, %04u/%02u/%02u %02u:%02u (%x)\n",
 842                           recording, recording_usec,
 843                           ts.year, ts.month, ts.day, ts.hour,
 844                           ts.minute, ts.typeAndTimezone);
 845                 UDF_SB_RECORDTIME(sb).tv_sec = recording;
 846                 UDF_SB_RECORDTIME(sb).tv_nsec = recording_usec * 1000;
 847         }
 848
 849         if (!udf_build_ustr(&instr, pvoldesc->volIdent, 32)) {
 850                 if (udf_CS0toUTF8(&outstr, &instr)) {
 851                         strncpy(UDF_SB_VOLIDENT(sb), outstr.u_name,
 852                                 outstr.u_len > 31 ? 31 : outstr.u_len);
 853                         udf_debug("volIdent[] = '%s'\n", UDF_SB_VOLIDENT(sb));
 854                 }
 855         }
 856
 857         if (!udf_build_ustr(&instr, pvoldesc->volSetIdent, 128)) {
 858                 if (udf_CS0toUTF8(&outstr, &instr))
 859                         udf_debug("volSetIdent[] = '%s'\n", outstr.u_name);
 860         }
 861 }
 862
 863 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
 864                              kernel_lb_addr *root)
 865 {
 866         struct fileSetDesc *fset;
 867
 868         fset = (struct fileSetDesc *)bh->b_data;
 869
 870         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
 871
 872         UDF_SB_SERIALNUM(sb) = le16_to_cpu(fset->descTag.tagSerialNum);
 873
 874         udf_debug("Rootdir at block=%d, partition=%d\n",
 875                   root->logicalBlockNum, root->partitionReferenceNum);
 876 }
 877
 878 static void udf_load_partdesc(struct super_block *sb, struct buffer_head *bh)
 879 {
 880         struct partitionDesc *p;
 881         int i;
 882
 883         p = (struct partitionDesc *)bh->b_data;
 884
 885         for (i = 0; i < UDF_SB_NUMPARTS(sb); i++) {
 886                 udf_debug("Searching map: (%d == %d)\n",
 887                           UDF_SB_PARTMAPS(sb)[i].s_partition_num, le16_to_cpu(p->partitionNumber));
 888                 if (UDF_SB_PARTMAPS(sb)[i].s_partition_num == le16_to_cpu(p->partitionNumber)) {
 889                         UDF_SB_PARTLEN(sb,i) = le32_to_cpu(p->partitionLength); /* blocks */
 890                         UDF_SB_PARTROOT(sb,i) = le32_to_cpu(p->partitionStartingLocation);
 891                         if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_READ_ONLY)
 892                                 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_READ_ONLY;
 893                         if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_WRITE_ONCE)
 894                                 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_WRITE_ONCE;
 895                         if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_REWRITABLE)
 896                                 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_REWRITABLE;
 897                         if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_OVERWRITABLE)
 898                                 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_OVERWRITABLE;
 899
 900                         if (!strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) ||
 901                             !strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03)) {
 902                                 struct partitionHeaderDesc *phd;
 903
 904                                 phd = (struct partitionHeaderDesc *)(p->partitionContentsUse);
 905                                 if (phd->unallocSpaceTable.extLength) {
 906                                         kernel_lb_addr loc = {
 907                                                 .logicalBlockNum = le32_to_cpu(phd->unallocSpaceTable.extPosition),
 908                                                 .partitionReferenceNum = i,
 909                                         };
 910
 911                                         UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table =
 912                                                 udf_iget(sb, loc);
 913                                         UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_UNALLOC_TABLE;
 914                                         udf_debug("unallocSpaceTable (part %d) @ %ld\n",
 915                                                   i, UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table->i_ino);
 916                                 }
 917                                 if (phd->unallocSpaceBitmap.extLength) {
 918                                         UDF_SB_ALLOC_BITMAP(sb, i, s_uspace);
 919                                         if (UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap != NULL) {
 920                                                 UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extLength =
 921                                                         le32_to_cpu(phd->unallocSpaceBitmap.extLength);
 922                                                 UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extPosition =
 923                                                         le32_to_cpu(phd->unallocSpaceBitmap.extPosition);
 924                                                 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_UNALLOC_BITMAP;
 925                                                 udf_debug("unallocSpaceBitmap (part %d) @ %d\n",
 926                                                           i, UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extPosition);
 927                                         }
 928                                 }
 929                                 if (phd->partitionIntegrityTable.extLength)
 930                                         udf_debug("partitionIntegrityTable (part %d)\n", i);
 931                                 if (phd->freedSpaceTable.extLength) {
 932                                         kernel_lb_addr loc = {
 933                                                 .logicalBlockNum = le32_to_cpu(phd->freedSpaceTable.extPosition),
 934                                                 .partitionReferenceNum = i,
 935                                         };
 936
 937                                         UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table =
 938                                                 udf_iget(sb, loc);
 939                                         UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_FREED_TABLE;
 940                                         udf_debug("freedSpaceTable (part %d) @ %ld\n",
 941                                                   i, UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table->i_ino);
 942                                 }
 943                                 if (phd->freedSpaceBitmap.extLength) {
 944                                         UDF_SB_ALLOC_BITMAP(sb, i, s_fspace);
 945                                         if (UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap != NULL) {
 946                                                 UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extLength =
 947                                                         le32_to_cpu(phd->freedSpaceBitmap.extLength);
 948                                                 UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extPosition =
 949                                                         le32_to_cpu(phd->freedSpaceBitmap.extPosition);
 950                                                 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_FREED_BITMAP;
 951                                                 udf_debug("freedSpaceBitmap (part %d) @ %d\n",
 952                                                           i, UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extPosition);
 953                                         }
 954                                 }
 955                         }
 956                         break;
 957                 }
 958         }
 959         if (i == UDF_SB_NUMPARTS(sb)) {
 960                 udf_debug("Partition (%d) not found in partition map\n",
 961                           le16_to_cpu(p->partitionNumber));
 962         } else {
 963                 udf_debug("Partition (%d:%d type %x) starts at physical %d, block length %d\n",
 964                           le16_to_cpu(p->partitionNumber), i, UDF_SB_PARTTYPE(sb,i),
 965                           UDF_SB_PARTROOT(sb,i), UDF_SB_PARTLEN(sb,i));
 966         }
 967 }
 968
 969 static int udf_load_logicalvol(struct super_block *sb, struct buffer_head *bh,
 970                                kernel_lb_addr *fileset)
 971 {
 972         struct logicalVolDesc *lvd;
 973         int i, j, offset;
 974         uint8_t type;
 975
 976         lvd = (struct logicalVolDesc *)bh->b_data;
 977
 978         UDF_SB_ALLOC_PARTMAPS(sb, le32_to_cpu(lvd->numPartitionMaps));
 979
 980         for (i = 0, offset = 0;
 981              i < UDF_SB_NUMPARTS(sb) && offset < le32_to_cpu(lvd->mapTableLength);
 982              i++, offset += ((struct genericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapLength) {
 983                 type = ((struct genericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapType;
 984                 if (type == 1) {
 985                         struct genericPartitionMap1 *gpm1 = (struct genericPartitionMap1 *)&(lvd->partitionMaps[offset]);
 986                         UDF_SB_PARTTYPE(sb,i) = UDF_TYPE1_MAP15;
 987                         UDF_SB_PARTVSN(sb,i) = le16_to_cpu(gpm1->volSeqNum);
 988                         UDF_SB_PARTNUM(sb,i) = le16_to_cpu(gpm1->partitionNum);
 989                         UDF_SB_PARTFUNC(sb,i) = NULL;
 990                 } else if (type == 2) {
 991                         struct udfPartitionMap2 *upm2 = (struct udfPartitionMap2 *)&(lvd->partitionMaps[offset]);
 992                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL, strlen(UDF_ID_VIRTUAL))) {
 993                                 if (le16_to_cpu(((__le16 *)upm2->partIdent.identSuffix)[0]) == 0x0150) {
 994                                         UDF_SB_PARTTYPE(sb,i) = UDF_VIRTUAL_MAP15;
 995                                         UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_virt15;
 996                                 } else if (le16_to_cpu(((__le16 *)upm2->partIdent.identSuffix)[0]) == 0x0200) {
 997                                         UDF_SB_PARTTYPE(sb,i) = UDF_VIRTUAL_MAP20;
 998                                         UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_virt20;
 999                                 }
1000                         } else if (!strncmp(upm2->partIdent.ident, UDF_ID_SPARABLE, strlen(UDF_ID_SPARABLE))) {
1001                                 uint32_t loc;
1002                                 uint16_t ident;
1003                                 struct sparingTable *st;
1004                                 struct sparablePartitionMap *spm = (struct sparablePartitionMap *)&(lvd->partitionMaps[offset]);
1005
1006                                 UDF_SB_PARTTYPE(sb,i) = UDF_SPARABLE_MAP15;
1007                                 UDF_SB_TYPESPAR(sb,i).s_packet_len = le16_to_cpu(spm->packetLength);
1008                                 for (j = 0; j < spm->numSparingTables; j++) {
1009                                         loc = le32_to_cpu(spm->locSparingTable[j]);
1010                                         UDF_SB_TYPESPAR(sb,i).s_spar_map[j] =
1011                                                 udf_read_tagged(sb, loc, loc, &ident);
1012                                         if (UDF_SB_TYPESPAR(sb,i).s_spar_map[j] != NULL) {
1013                                                 st = (struct sparingTable *)UDF_SB_TYPESPAR(sb,i).s_spar_map[j]->b_data;
1014                                                 if (ident != 0 ||
1015                                                     strncmp(st->sparingIdent.ident, UDF_ID_SPARING, strlen(UDF_ID_SPARING))) {
1016                                                         brelse(UDF_SB_TYPESPAR(sb,i).s_spar_map[j]);
1017                                                         UDF_SB_TYPESPAR(sb,i).s_spar_map[j] = NULL;
1018                                                 }
1019                                         }
1020                                 }
1021                                 UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_spar15;
1022                         } else {
1023                                 udf_debug("Unknown ident: %s\n", upm2->partIdent.ident);
1024                                 continue;
1025                         }
1026                         UDF_SB_PARTVSN(sb,i) = le16_to_cpu(upm2->volSeqNum);
1027                         UDF_SB_PARTNUM(sb,i) = le16_to_cpu(upm2->partitionNum);
1028                 }
1029                 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1030                           i, UDF_SB_PARTNUM(sb,i), type, UDF_SB_PARTVSN(sb,i));
1031         }
1032
1033         if (fileset) {
1034                 long_ad *la = (long_ad *)&(lvd->logicalVolContentsUse[0]);
1035
1036                 *fileset = lelb_to_cpu(la->extLocation);
1037                 udf_debug("FileSet found in LogicalVolDesc at block=%d, partition=%d\n",
1038                           fileset->logicalBlockNum,
1039                           fileset->partitionReferenceNum);
1040         }
1041         if (lvd->integritySeqExt.extLength)
1042                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1043
1044         return 0;
1045 }
1046
1047 /*
1048  * udf_load_logicalvolint
1049  *
1050  */
1051 static void udf_load_logicalvolint(struct super_block *sb, kernel_extent_ad loc)
1052 {
1053         struct buffer_head *bh = NULL;
1054         uint16_t ident;
1055
1056         while (loc.extLength > 0 &&
1057                (bh = udf_read_tagged(sb, loc.extLocation,
1058                                      loc.extLocation, &ident)) &&
1059                ident == TAG_IDENT_LVID) {
1060                 UDF_SB_LVIDBH(sb) = bh;
1061
1062                 if (UDF_SB_LVID(sb)->nextIntegrityExt.extLength)
1063                         udf_load_logicalvolint(sb, leea_to_cpu(UDF_SB_LVID(sb)->nextIntegrityExt));
1064
1065                 if (UDF_SB_LVIDBH(sb) != bh)
1066                         brelse(bh);
1067                 loc.extLength -= sb->s_blocksize;
1068                 loc.extLocation++;
1069         }
1070         if (UDF_SB_LVIDBH(sb) != bh)
1071                 brelse(bh);
1072 }
1073
1074 /*
1075  * udf_process_sequence
1076  *
1077  * PURPOSE
1078  *      Process a main/reserve volume descriptor sequence.
1079  *
1080  * PRE-CONDITIONS
1081  *      sb                      Pointer to _locked_ superblock.
1082  *      block                   First block of first extent of the sequence.
1083  *      lastblock               Lastblock of first extent of the sequence.
1084  *
1085  * HISTORY
1086  *      July 1, 1997 - Andrew E. Mileski
1087  *      Written, tested, and released.
1088  */
1089 static int udf_process_sequence(struct super_block *sb, long block, long lastblock,
1090                                  kernel_lb_addr *fileset)
1091 {
1092         struct buffer_head *bh = NULL;
1093         struct udf_vds_record vds[VDS_POS_LENGTH];
1094         struct generic_desc *gd;
1095         struct volDescPtr *vdp;
1096         int done = 0;
1097         int i, j;
1098         uint32_t vdsn;
1099         uint16_t ident;
1100         long next_s = 0, next_e = 0;
1101
1102         memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1103
1104         /* Read the main descriptor sequence */
1105         for (; (!done && block <= lastblock); block++) {
1106
1107                 bh = udf_read_tagged(sb, block, block, &ident);
1108                 if (!bh)
1109                         break;
1110
1111                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1112                 gd = (struct generic_desc *)bh->b_data;
1113                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1114                 switch (ident) {
1115                 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1116                         if (vdsn >= vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum) {
1117                                 vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum = vdsn;
1118                                 vds[VDS_POS_PRIMARY_VOL_DESC].block = block;
1119                         }
1120                         break;
1121                 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1122                         if (vdsn >= vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum) {
1123                                 vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum = vdsn;
1124                                 vds[VDS_POS_VOL_DESC_PTR].block = block;
1125
1126                                 vdp = (struct volDescPtr *)bh->b_data;
1127                                 next_s = le32_to_cpu(vdp->nextVolDescSeqExt.extLocation);
1128                                 next_e = le32_to_cpu(vdp->nextVolDescSeqExt.extLength);
1129                                 next_e = next_e >> sb->s_blocksize_bits;
1130                                 next_e += next_s;
1131                         }
1132                         break;
1133                 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1134                         if (vdsn >= vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum) {
1135                                 vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum = vdsn;
1136                                 vds[VDS_POS_IMP_USE_VOL_DESC].block = block;
1137                         }
1138                         break;
1139                 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1140                         if (!vds[VDS_POS_PARTITION_DESC].block)
1141                                 vds[VDS_POS_PARTITION_DESC].block = block;
1142                         break;
1143                 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1144                         if (vdsn >= vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum) {
1145                                 vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum = vdsn;
1146                                 vds[VDS_POS_LOGICAL_VOL_DESC].block = block;
1147                         }
1148                         break;
1149                 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1150                         if (vdsn >= vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum) {
1151                                 vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum = vdsn;
1152                                 vds[VDS_POS_UNALLOC_SPACE_DESC].block = block;
1153                         }
1154                         break;
1155                 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1156                         vds[VDS_POS_TERMINATING_DESC].block = block;
1157                         if (next_e) {
1158                                 block = next_s;
1159                                 lastblock = next_e;
1160                                 next_s = next_e = 0;
1161                         } else {
1162                                 done = 1;
1163                         }
1164                         break;
1165                 }
1166                 brelse(bh);
1167         }
1168         for (i = 0; i < VDS_POS_LENGTH; i++) {
1169                 if (vds[i].block) {
1170                         bh = udf_read_tagged(sb, vds[i].block, vds[i].block, &ident);
1171
1172                         if (i == VDS_POS_PRIMARY_VOL_DESC) {
1173                                 udf_load_pvoldesc(sb, bh);
1174                         } else if (i == VDS_POS_LOGICAL_VOL_DESC) {
1175                                 udf_load_logicalvol(sb, bh, fileset);
1176                         } else if (i == VDS_POS_PARTITION_DESC) {
1177                                 struct buffer_head *bh2 = NULL;
1178                                 udf_load_partdesc(sb, bh);
1179                                 for (j = vds[i].block + 1; j <  vds[VDS_POS_TERMINATING_DESC].block; j++) {
1180                                         bh2 = udf_read_tagged(sb, j, j, &ident);
1181                                         gd = (struct generic_desc *)bh2->b_data;
1182                                         if (ident == TAG_IDENT_PD)
1183                                                 udf_load_partdesc(sb, bh2);
1184                                         brelse(bh2);
1185                                 }
1186                         }
1187                         brelse(bh);
1188                 }
1189         }
1190
1191         return 0;
1192 }
1193
1194 /*
1195  * udf_check_valid()
1196  */
1197 static int udf_check_valid(struct super_block *sb, int novrs, int silent)
1198 {
1199         long block;
1200
1201         if (novrs) {
1202                 udf_debug("Validity check skipped because of novrs option\n");
1203                 return 0;
1204         }
1205         /* Check that it is NSR02 compliant */
1206         /* Process any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
1207         else if ((block = udf_vrs(sb, silent)) == -1) {
1208                 udf_debug("Failed to read byte 32768. Assuming open disc. "
1209                           "Skipping validity check\n");
1210                 if (!UDF_SB_LASTBLOCK(sb))
1211                         UDF_SB_LASTBLOCK(sb) = udf_get_last_block(sb);
1212                 return 0;
1213         } else {
1214                 return !block;
1215         }
1216 }
1217
1218 static int udf_load_partition(struct super_block *sb, kernel_lb_addr *fileset)
1219 {
1220         struct anchorVolDescPtr *anchor;
1221         uint16_t ident;
1222         struct buffer_head *bh;
1223         long main_s, main_e, reserve_s, reserve_e;
1224         int i, j;
1225
1226         if (!sb)
1227                 return 1;
1228
1229         for (i = 0; i < ARRAY_SIZE(UDF_SB_ANCHOR(sb)); i++) {
1230                 if (UDF_SB_ANCHOR(sb)[i] &&
1231                     (bh = udf_read_tagged(sb, UDF_SB_ANCHOR(sb)[i],
1232                                           UDF_SB_ANCHOR(sb)[i], &ident))) {
1233                         anchor = (struct anchorVolDescPtr *)bh->b_data;
1234
1235                         /* Locate the main sequence */
1236                         main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1237                         main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength );
1238                         main_e = main_e >> sb->s_blocksize_bits;
1239                         main_e += main_s;
1240
1241                         /* Locate the reserve sequence */
1242                         reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1243                         reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1244                         reserve_e = reserve_e >> sb->s_blocksize_bits;
1245                         reserve_e += reserve_s;
1246
1247                         brelse(bh);
1248
1249                         /* Process the main & reserve sequences */
1250                         /* responsible for finding the PartitionDesc(s) */
1251                         if (!(udf_process_sequence(sb, main_s, main_e, fileset) &&
1252                               udf_process_sequence(sb, reserve_s, reserve_e, fileset))) {
1253                                 break;
1254                         }
1255                 }
1256         }
1257
1258         if (i == ARRAY_SIZE(UDF_SB_ANCHOR(sb))) {
1259                 udf_debug("No Anchor block found\n");
1260                 return 1;
1261         } else
1262                 udf_debug("Using anchor in block %d\n", UDF_SB_ANCHOR(sb)[i]);
1263
1264         for (i = 0; i < UDF_SB_NUMPARTS(sb); i++) {
1265                 kernel_lb_addr uninitialized_var(ino);
1266                 switch (UDF_SB_PARTTYPE(sb, i)) {
1267                 case UDF_VIRTUAL_MAP15:
1268                 case UDF_VIRTUAL_MAP20:
1269                         if (!UDF_SB_LASTBLOCK(sb)) {
1270                                 UDF_SB_LASTBLOCK(sb) = udf_get_last_block(sb);
1271                                 udf_find_anchor(sb);
1272                         }
1273
1274                         if (!UDF_SB_LASTBLOCK(sb)) {
1275                                 udf_debug("Unable to determine Lastblock (For "
1276                                                 "Virtual Partition)\n");
1277                                 return 1;
1278                         }
1279
1280                         for (j = 0; j < UDF_SB_NUMPARTS(sb); j++) {
1281                                 if (j != i && UDF_SB_PARTVSN(sb, i) ==
1282                                         UDF_SB_PARTVSN(sb, j) &&
1283                                         UDF_SB_PARTNUM(sb, i) ==
1284                                                 UDF_SB_PARTNUM(sb, j)) {
1285                                         ino.partitionReferenceNum = j;
1286                                         ino.logicalBlockNum =
1287                                             UDF_SB_LASTBLOCK(sb) -
1288                                             UDF_SB_PARTROOT(sb, j);
1289                                         break;
1290                                 }
1291                         }
1292
1293                         if (j == UDF_SB_NUMPARTS(sb))
1294                                 return 1;
1295
1296                         if (!(UDF_SB_VAT(sb) = udf_iget(sb, ino)))
1297                                 return 1;
1298
1299                         if (UDF_SB_PARTTYPE(sb, i) == UDF_VIRTUAL_MAP15) {
1300                                 UDF_SB_TYPEVIRT(sb, i).s_start_offset =
1301                                     udf_ext0_offset(UDF_SB_VAT(sb));
1302                                 UDF_SB_TYPEVIRT(sb, i).s_num_entries =
1303                                     (UDF_SB_VAT(sb)->i_size - 36) >> 2;
1304                         } else if (UDF_SB_PARTTYPE(sb, i) == UDF_VIRTUAL_MAP20) {
1305                                 struct buffer_head *bh = NULL;
1306                                 uint32_t pos;
1307
1308                                 pos = udf_block_map(UDF_SB_VAT(sb), 0);
1309                                 bh = sb_bread(sb, pos);
1310                                 if (!bh)
1311                                         return 1;
1312                                 UDF_SB_TYPEVIRT(sb, i).s_start_offset =
1313                                     le16_to_cpu(((struct
1314                                         virtualAllocationTable20 *)bh->b_data +
1315                                           udf_ext0_offset(UDF_SB_VAT(sb)))->
1316                                                 lengthHeader) +
1317                                           udf_ext0_offset(UDF_SB_VAT(sb));
1318                                 UDF_SB_TYPEVIRT(sb, i).s_num_entries =
1319                                     (UDF_SB_VAT(sb)->i_size -
1320                                      UDF_SB_TYPEVIRT(sb, i).s_start_offset) >> 2;
1321                                 brelse(bh);
1322                         }
1323                         UDF_SB_PARTROOT(sb, i) = udf_get_pblock(sb, 0, i, 0);
1324                         UDF_SB_PARTLEN(sb, i) = UDF_SB_PARTLEN(sb,
1325                                                 ino.partitionReferenceNum);
1326                 }
1327         }
1328         return 0;
1329 }
1330
1331 static void udf_open_lvid(struct super_block *sb)
1332 {
1333         if (UDF_SB_LVIDBH(sb)) {
1334                 int i;
1335                 kernel_timestamp cpu_time;
1336
1337                 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1338                 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1339                 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
1340                         UDF_SB_LVID(sb)->recordingDateAndTime =
1341                             cpu_to_lets(cpu_time);
1342                 UDF_SB_LVID(sb)->integrityType = LVID_INTEGRITY_TYPE_OPEN;
1343
1344                 UDF_SB_LVID(sb)->descTag.descCRC =
1345                     cpu_to_le16(udf_crc((char *)UDF_SB_LVID(sb) + sizeof(tag),
1346                                         le16_to_cpu(UDF_SB_LVID(sb)->descTag.
1347                                                     descCRCLength), 0));
1348
1349                 UDF_SB_LVID(sb)->descTag.tagChecksum = 0;
1350                 for (i = 0; i < 16; i++)
1351                         if (i != 4)
1352                                 UDF_SB_LVID(sb)->descTag.tagChecksum +=
1353                                     ((uint8_t *) &
1354                                      (UDF_SB_LVID(sb)->descTag))[i];
1355
1356                 mark_buffer_dirty(UDF_SB_LVIDBH(sb));
1357         }
1358 }
1359
1360 static void udf_close_lvid(struct super_block *sb)
1361 {
1362         kernel_timestamp cpu_time;
1363         int i;
1364
1365         if (UDF_SB_LVIDBH(sb) &&
1366             UDF_SB_LVID(sb)->integrityType == LVID_INTEGRITY_TYPE_OPEN) {
1367                 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1368                 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1369                 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
1370                         UDF_SB_LVID(sb)->recordingDateAndTime = cpu_to_lets(cpu_time);
1371                 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(UDF_SB_LVIDIU(sb)->maxUDFWriteRev))
1372                         UDF_SB_LVIDIU(sb)->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1373                 if (UDF_SB_UDFREV(sb) > le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev))
1374                         UDF_SB_LVIDIU(sb)->minUDFReadRev = cpu_to_le16(UDF_SB_UDFREV(sb));
1375                 if (UDF_SB_UDFREV(sb) > le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev))
1376                         UDF_SB_LVIDIU(sb)->minUDFWriteRev = cpu_to_le16(UDF_SB_UDFREV(sb));
1377                 UDF_SB_LVID(sb)->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1378
1379                 UDF_SB_LVID(sb)->descTag.descCRC =
1380                         cpu_to_le16(udf_crc((char *)UDF_SB_LVID(sb) + sizeof(tag),
1381                                             le16_to_cpu(UDF_SB_LVID(sb)->descTag.descCRCLength), 0));
1382
1383                 UDF_SB_LVID(sb)->descTag.tagChecksum = 0;
1384                 for (i = 0; i < 16; i++)
1385                         if (i != 4)
1386                                 UDF_SB_LVID(sb)->descTag.tagChecksum +=
1387                                         ((uint8_t *)&(UDF_SB_LVID(sb)->descTag))[i];
1388
1389                 mark_buffer_dirty(UDF_SB_LVIDBH(sb));
1390         }
1391 }
1392
1393 /*
1394  * udf_read_super
1395  *
1396  * PURPOSE
1397  *      Complete the specified super block.
1398  *
1399  * PRE-CONDITIONS
1400  *      sb                      Pointer to superblock to complete - never NULL.
1401  *      sb->s_dev               Device to read suberblock from.
1402  *      options                 Pointer to mount options.
1403  *      silent                  Silent flag.
1404  *
1405  * HISTORY
1406  *      July 1, 1997 - Andrew E. Mileski
1407  *      Written, tested, and released.
1408  */
1409 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1410 {
1411         int i;
1412         struct inode *inode = NULL;
1413         struct udf_options uopt;
1414         kernel_lb_addr rootdir, fileset;
1415         struct udf_sb_info *sbi;
1416
1417         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1418         uopt.uid = -1;
1419         uopt.gid = -1;
1420         uopt.umask = 0;
1421
1422         sbi = kmalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1423         if (!sbi)
1424                 return -ENOMEM;
1425
1426         sb->s_fs_info = sbi;
1427         memset(UDF_SB(sb), 0x00, sizeof(struct udf_sb_info));
1428
1429         mutex_init(&sbi->s_alloc_mutex);
1430
1431         if (!udf_parse_options((char *)options, &uopt))
1432                 goto error_out;
1433
1434         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1435             uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
1436                 udf_error(sb, "udf_read_super",
1437                           "utf8 cannot be combined with iocharset\n");
1438                 goto error_out;
1439         }
1440 #ifdef CONFIG_UDF_NLS
1441         if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1442                 uopt.nls_map = load_nls_default();
1443                 if (!uopt.nls_map)
1444                         uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1445                 else
1446                         udf_debug("Using default NLS map\n");
1447         }
1448 #endif
1449         if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1450                 uopt.flags |= (1 << UDF_FLAG_UTF8);
1451
1452         fileset.logicalBlockNum = 0xFFFFFFFF;
1453         fileset.partitionReferenceNum = 0xFFFF;
1454
1455         UDF_SB(sb)->s_flags = uopt.flags;
1456         UDF_SB(sb)->s_uid = uopt.uid;
1457         UDF_SB(sb)->s_gid = uopt.gid;
1458         UDF_SB(sb)->s_umask = uopt.umask;
1459         UDF_SB(sb)->s_nls_map = uopt.nls_map;
1460
1461         /* Set the block size for all transfers */
1462         if (!udf_set_blocksize(sb, uopt.blocksize))
1463                 goto error_out;
1464
1465         if (uopt.session == 0xFFFFFFFF)
1466                 UDF_SB_SESSION(sb) = udf_get_last_session(sb);
1467         else
1468                 UDF_SB_SESSION(sb) = uopt.session;
1469
1470         udf_debug("Multi-session=%d\n", UDF_SB_SESSION(sb));
1471
1472         UDF_SB_LASTBLOCK(sb) = uopt.lastblock;
1473         UDF_SB_ANCHOR(sb)[0] = UDF_SB_ANCHOR(sb)[1] = 0;
1474         UDF_SB_ANCHOR(sb)[2] = uopt.anchor;
1475         UDF_SB_ANCHOR(sb)[3] = 256;
1476
1477         if (udf_check_valid(sb, uopt.novrs, silent)) { /* read volume recognition sequences */
1478                 printk("UDF-fs: No VRS found\n");
1479                 goto error_out;
1480         }
1481
1482         udf_find_anchor(sb);
1483
1484         /* Fill in the rest of the superblock */
1485         sb->s_op = &udf_sb_ops;
1486         sb->dq_op = NULL;
1487         sb->s_dirt = 0;
1488         sb->s_magic = UDF_SUPER_MAGIC;
1489         sb->s_time_gran = 1000;
1490
1491         if (udf_load_partition(sb, &fileset)) {
1492                 printk("UDF-fs: No partition found (1)\n");
1493                 goto error_out;
1494         }
1495
1496         udf_debug("Lastblock=%d\n", UDF_SB_LASTBLOCK(sb));
1497
1498         if (UDF_SB_LVIDBH(sb)) {
1499                 uint16_t minUDFReadRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev);
1500                 uint16_t minUDFWriteRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev);
1501                 /* uint16_t maxUDFWriteRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->maxUDFWriteRev); */
1502
1503                 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
1504                         printk("UDF-fs: minUDFReadRev=%x (max is %x)\n",
1505                                le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev),
1506                                UDF_MAX_READ_VERSION);
1507                         goto error_out;
1508                 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION) {
1509                         sb->s_flags |= MS_RDONLY;
1510                 }
1511
1512                 UDF_SB_UDFREV(sb) = minUDFWriteRev;
1513
1514                 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1515                         UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
1516                 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
1517                         UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
1518         }
1519
1520         if (!UDF_SB_NUMPARTS(sb)) {
1521                 printk("UDF-fs: No partition found (2)\n");
1522                 goto error_out;
1523         }
1524
1525         if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_READ_ONLY) {
1526                 printk("UDF-fs: Partition marked readonly; forcing readonly mount\n");
1527                 sb->s_flags |= MS_RDONLY;
1528         }
1529
1530         if (udf_find_fileset(sb, &fileset, &rootdir)) {
1531                 printk("UDF-fs: No fileset found\n");
1532                 goto error_out;
1533         }
1534
1535         if (!silent) {
1536                 kernel_timestamp ts;
1537                 udf_time_to_stamp(&ts, UDF_SB_RECORDTIME(sb));
1538                 udf_info("UDF %s (%s) Mounting volume '%s', "
1539                          "timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
1540                          UDFFS_VERSION, UDFFS_DATE,
1541                          UDF_SB_VOLIDENT(sb), ts.year, ts.month, ts.day, ts.hour, ts.minute,
1542                          ts.typeAndTimezone);
1543         }
1544         if (!(sb->s_flags & MS_RDONLY))
1545                 udf_open_lvid(sb);
1546
1547         /* Assign the root inode */
1548         /* assign inodes by physical block number */
1549         /* perhaps it's not extensible enough, but for now ... */
1550         inode = udf_iget(sb, rootdir);
1551         if (!inode) {
1552                 printk("UDF-fs: Error in udf_iget, block=%d, partition=%d\n",
1553                        rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
1554                 goto error_out;
1555         }
1556
1557         /* Allocate a dentry for the root inode */
1558         sb->s_root = d_alloc_root(inode);
1559         if (!sb->s_root) {
1560                 printk("UDF-fs: Couldn't allocate root dentry\n");
1561                 iput(inode);
1562                 goto error_out;
1563         }
1564         sb->s_maxbytes = MAX_LFS_FILESIZE;
1565         return 0;
1566
1567 error_out:
1568         if (UDF_SB_VAT(sb))
1569                 iput(UDF_SB_VAT(sb));
1570         if (UDF_SB_NUMPARTS(sb)) {
1571                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1572                         iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1573                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1574                         iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1575                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1576                         UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb), s_uspace);
1577                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1578                         UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb), s_fspace);
1579                 if (UDF_SB_PARTTYPE(sb, UDF_SB_PARTITION(sb)) == UDF_SPARABLE_MAP15) {
1580                         for (i = 0; i < 4; i++)
1581                                 brelse(UDF_SB_TYPESPAR(sb, UDF_SB_PARTITION(sb)).s_spar_map[i]);
1582                 }
1583         }
1584 #ifdef CONFIG_UDF_NLS
1585         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1586                 unload_nls(UDF_SB(sb)->s_nls_map);
1587 #endif
1588         if (!(sb->s_flags & MS_RDONLY))
1589                 udf_close_lvid(sb);
1590         brelse(UDF_SB_LVIDBH(sb));
1591         UDF_SB_FREE(sb);
1592         kfree(sbi);
1593         sb->s_fs_info = NULL;
1594
1595         return -EINVAL;
1596 }
1597
1598 void udf_error(struct super_block *sb, const char *function,
1599                const char *fmt, ...)
1600 {
1601         va_list args;
1602
1603         if (!(sb->s_flags & MS_RDONLY)) {
1604                 /* mark sb error */
1605                 sb->s_dirt = 1;
1606         }
1607         va_start(args, fmt);
1608         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1609         va_end(args);
1610         printk (KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
1611                 sb->s_id, function, error_buf);
1612 }
1613
1614 void udf_warning(struct super_block *sb, const char *function,
1615                  const char *fmt, ...)
1616 {
1617         va_list args;
1618
1619         va_start(args, fmt);
1620         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1621         va_end(args);
1622         printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
1623                sb->s_id, function, error_buf);
1624 }
1625
1626 /*
1627  * udf_put_super
1628  *
1629  * PURPOSE
1630  *      Prepare for destruction of the superblock.
1631  *
1632  * DESCRIPTION
1633  *      Called before the filesystem is unmounted.
1634  *
1635  * HISTORY
1636  *      July 1, 1997 - Andrew E. Mileski
1637  *      Written, tested, and released.
1638  */
1639 static void udf_put_super(struct super_block *sb)
1640 {
1641         int i;
1642
1643         if (UDF_SB_VAT(sb))
1644                 iput(UDF_SB_VAT(sb));
1645         if (UDF_SB_NUMPARTS(sb)) {
1646                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1647                         iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1648                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1649                         iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1650                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1651                         UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb), s_uspace);
1652                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1653                         UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb), s_fspace);
1654                 if (UDF_SB_PARTTYPE(sb, UDF_SB_PARTITION(sb)) == UDF_SPARABLE_MAP15) {
1655                         for (i = 0; i < 4; i++)
1656                                 brelse(UDF_SB_TYPESPAR(sb, UDF_SB_PARTITION(sb)).s_spar_map[i]);
1657                 }
1658         }
1659 #ifdef CONFIG_UDF_NLS
1660         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1661                 unload_nls(UDF_SB(sb)->s_nls_map);
1662 #endif
1663         if (!(sb->s_flags & MS_RDONLY))
1664                 udf_close_lvid(sb);
1665         brelse(UDF_SB_LVIDBH(sb));
1666         UDF_SB_FREE(sb);
1667         kfree(sb->s_fs_info);
1668         sb->s_fs_info = NULL;
1669 }
1670
1671 /*
1672  * udf_stat_fs
1673  *
1674  * PURPOSE
1675  *      Return info about the filesystem.
1676  *
1677  * DESCRIPTION
1678  *      Called by sys_statfs()
1679  *
1680  * HISTORY
1681  *      July 1, 1997 - Andrew E. Mileski
1682  *      Written, tested, and released.
1683  */
1684 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
1685 {
1686         struct super_block *sb = dentry->d_sb;
1687
1688         buf->f_type = UDF_SUPER_MAGIC;
1689         buf->f_bsize = sb->s_blocksize;
1690         buf->f_blocks = UDF_SB_PARTLEN(sb, UDF_SB_PARTITION(sb));
1691         buf->f_bfree = udf_count_free(sb);
1692         buf->f_bavail = buf->f_bfree;
1693         buf->f_files = (UDF_SB_LVIDBH(sb) ?
1694                         (le32_to_cpu(UDF_SB_LVIDIU(sb)->numFiles) +
1695                          le32_to_cpu(UDF_SB_LVIDIU(sb)->numDirs)) : 0) + buf->f_bfree;
1696         buf->f_ffree = buf->f_bfree;
1697         /* __kernel_fsid_t f_fsid */
1698         buf->f_namelen = UDF_NAME_LEN - 2;
1699
1700         return 0;
1701 }
1702
1703 static unsigned char udf_bitmap_lookup[16] = {
1704         0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4
1705 };
1706
1707 static unsigned int udf_count_free_bitmap(struct super_block *sb, struct udf_bitmap *bitmap)
1708 {
1709         struct buffer_head *bh = NULL;
1710         unsigned int accum = 0;
1711         int index;
1712         int block = 0, newblock;
1713         kernel_lb_addr loc;
1714         uint32_t bytes;
1715         uint8_t value;
1716         uint8_t *ptr;
1717         uint16_t ident;
1718         struct spaceBitmapDesc *bm;
1719
1720         lock_kernel();
1721
1722         loc.logicalBlockNum = bitmap->s_extPosition;
1723         loc.partitionReferenceNum = UDF_SB_PARTITION(sb);
1724         bh = udf_read_ptagged(sb, loc, 0, &ident);
1725
1726         if (!bh) {
1727                 printk(KERN_ERR "udf: udf_count_free failed\n");
1728                 goto out;
1729         } else if (ident != TAG_IDENT_SBD) {
1730                 brelse(bh);
1731                 printk(KERN_ERR "udf: udf_count_free failed\n");
1732                 goto out;
1733         }
1734
1735         bm = (struct spaceBitmapDesc *)bh->b_data;
1736         bytes = le32_to_cpu(bm->numOfBytes);
1737         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
1738         ptr = (uint8_t *)bh->b_data;
1739
1740         while (bytes > 0) {
1741                 while ((bytes > 0) && (index < sb->s_blocksize)) {
1742                         value = ptr[index];
1743                         accum += udf_bitmap_lookup[value & 0x0f];
1744                         accum += udf_bitmap_lookup[value >> 4];
1745                         index++;
1746                         bytes--;
1747                 }
1748                 if (bytes) {
1749                         brelse(bh);
1750                         newblock = udf_get_lb_pblock(sb, loc, ++block);
1751                         bh = udf_tread(sb, newblock);
1752                         if (!bh) {
1753                                 udf_debug("read failed\n");
1754                                 goto out;
1755                         }
1756                         index = 0;
1757                         ptr = (uint8_t *)bh->b_data;
1758                 }
1759         }
1760         brelse(bh);
1761
1762 out:
1763         unlock_kernel();
1764
1765         return accum;
1766 }
1767
1768 static unsigned int udf_count_free_table(struct super_block *sb, struct inode *table)
1769 {
1770         unsigned int accum = 0;
1771         uint32_t elen;
1772         kernel_lb_addr eloc;
1773         int8_t etype;
1774         struct extent_position epos;
1775
1776         lock_kernel();
1777
1778         epos.block = UDF_I_LOCATION(table);
1779         epos.offset = sizeof(struct unallocSpaceEntry);
1780         epos.bh = NULL;
1781
1782         while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1) {
1783                 accum += (elen >> table->i_sb->s_blocksize_bits);
1784         }
1785         brelse(epos.bh);
1786
1787         unlock_kernel();
1788
1789         return accum;
1790 }
1791
1792 static unsigned int udf_count_free(struct super_block *sb)
1793 {
1794         unsigned int accum = 0;
1795
1796         if (UDF_SB_LVIDBH(sb)) {
1797                 if (le32_to_cpu(UDF_SB_LVID(sb)->numOfPartitions) > UDF_SB_PARTITION(sb)) {
1798                         accum = le32_to_cpu(UDF_SB_LVID(sb)->freeSpaceTable[UDF_SB_PARTITION(sb)]);
1799                         if (accum == 0xFFFFFFFF)
1800                                 accum = 0;
1801                 }
1802         }
1803
1804         if (accum)
1805                 return accum;
1806
1807         if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP) {
1808                 accum += udf_count_free_bitmap(sb,
1809                                                UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_bitmap);
1810         }
1811         if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP) {
1812                 accum += udf_count_free_bitmap(sb,
1813                                                UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_bitmap);
1814         }
1815         if (accum)
1816                 return accum;
1817
1818         if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE) {
1819                 accum += udf_count_free_table(sb,
1820                                               UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1821         }
1822         if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE) {
1823                 accum += udf_count_free_table(sb,
1824                                               UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1825         }
1826
1827         return accum;
1828 }