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   1 /*
   2  * super.c
   3  *
   4  * PURPOSE
   5  *  Super block routines for the OSTA-UDF(tm) filesystem.
   6  *
   7  * DESCRIPTION
   8  *  OSTA-UDF(tm) = Optical Storage Technology Association
   9  *  Universal Disk Format.
  10  *
  11  *  This code is based on version 2.00 of the UDF specification,
  12  *  and revision 3 of the ECMA 167 standard [equivalent to ISO 13346].
  13  *    http://www.osta.org/
  14  *    http://www.ecma.ch/
  15  *    http://www.iso.org/
  16  *
  17  * COPYRIGHT
  18  *  This file is distributed under the terms of the GNU General Public
  19  *  License (GPL). Copies of the GPL can be obtained from:
  20  *    ftp://prep.ai.mit.edu/pub/gnu/GPL
  21  *  Each contributing author retains all rights to their own work.
  22  *
  23  *  (C) 1998 Dave Boynton
  24  *  (C) 1998-2004 Ben Fennema
  25  *  (C) 2000 Stelias Computing Inc
  26  *
  27  * HISTORY
  28  *
  29  *  09/24/98 dgb  changed to allow compiling outside of kernel, and
  30  *                added some debugging.
  31  *  10/01/98 dgb  updated to allow (some) possibility of compiling w/2.0.34
  32  *  10/16/98      attempting some multi-session support
  33  *  10/17/98      added freespace count for "df"
  34  *  11/11/98 gr   added novrs option
  35  *  11/26/98 dgb  added fileset,anchor mount options
  36  *  12/06/98 blf  really hosed things royally. vat/sparing support. sequenced
  37  *                vol descs. 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 <linux/errno.h>
  56 #include <linux/mount.h>
  57 #include <linux/seq_file.h>
  58 #include <linux/bitmap.h>
  59 #include <linux/crc-itu-t.h>
  60 #include <asm/byteorder.h>
  61
  62 #include "udf_sb.h"
  63 #include "udf_i.h"
  64
  65 #include <linux/init.h>
  66 #include <asm/uaccess.h>
  67
  68 #define VDS_POS_PRIMARY_VOL_DESC        0
  69 #define VDS_POS_UNALLOC_SPACE_DESC      1
  70 #define VDS_POS_LOGICAL_VOL_DESC        2
  71 #define VDS_POS_PARTITION_DESC          3
  72 #define VDS_POS_IMP_USE_VOL_DESC        4
  73 #define VDS_POS_VOL_DESC_PTR            5
  74 #define VDS_POS_TERMINATING_DESC        6
  75 #define VDS_POS_LENGTH                  7
  76
  77 #define UDF_DEFAULT_BLOCKSIZE 2048
  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 void udf_load_logicalvolint(struct super_block *, kernel_extent_ad);
  89 static void udf_find_anchor(struct super_block *);
  90 static int udf_find_fileset(struct super_block *, kernel_lb_addr *,
  91                             kernel_lb_addr *);
  92 static void udf_load_fileset(struct super_block *, struct buffer_head *,
  93                              kernel_lb_addr *);
  94 static void udf_open_lvid(struct super_block *);
  95 static void udf_close_lvid(struct super_block *);
  96 static unsigned int udf_count_free(struct super_block *);
  97 static int udf_statfs(struct dentry *, struct kstatfs *);
  98 static int udf_show_options(struct seq_file *, struct vfsmount *);
  99 static void udf_error(struct super_block *sb, const char *function,
 100                       const char *fmt, ...);
 101
 102 struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct udf_sb_info *sbi)
 103 {
 104         struct logicalVolIntegrityDesc *lvid =
 105                 (struct logicalVolIntegrityDesc *)sbi->s_lvid_bh->b_data;
 106         __u32 number_of_partitions = le32_to_cpu(lvid->numOfPartitions);
 107         __u32 offset = number_of_partitions * 2 *
 108                                 sizeof(uint32_t)/sizeof(uint8_t);
 109         return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
 110 }
 111
 112 /* UDF filesystem type */
 113 static int udf_get_sb(struct file_system_type *fs_type,
 114                       int flags, const char *dev_name, void *data,
 115                       struct vfsmount *mnt)
 116 {
 117         return get_sb_bdev(fs_type, flags, dev_name, data, udf_fill_super, mnt);
 118 }
 119
 120 static struct file_system_type udf_fstype = {
 121         .owner          = THIS_MODULE,
 122         .name           = "udf",
 123         .get_sb         = udf_get_sb,
 124         .kill_sb        = kill_block_super,
 125         .fs_flags       = FS_REQUIRES_DEV,
 126 };
 127
 128 static struct kmem_cache *udf_inode_cachep;
 129
 130 static struct inode *udf_alloc_inode(struct super_block *sb)
 131 {
 132         struct udf_inode_info *ei;
 133         ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
 134         if (!ei)
 135                 return NULL;
 136
 137         ei->i_unique = 0;
 138         ei->i_lenExtents = 0;
 139         ei->i_next_alloc_block = 0;
 140         ei->i_next_alloc_goal = 0;
 141         ei->i_strat4096 = 0;
 142
 143         return &ei->vfs_inode;
 144 }
 145
 146 static void udf_destroy_inode(struct inode *inode)
 147 {
 148         kmem_cache_free(udf_inode_cachep, UDF_I(inode));
 149 }
 150
 151 static void init_once(struct kmem_cache *cachep, void *foo)
 152 {
 153         struct udf_inode_info *ei = (struct udf_inode_info *)foo;
 154
 155         ei->i_ext.i_data = NULL;
 156         inode_init_once(&ei->vfs_inode);
 157 }
 158
 159 static int init_inodecache(void)
 160 {
 161         udf_inode_cachep = kmem_cache_create("udf_inode_cache",
 162                                              sizeof(struct udf_inode_info),
 163                                              0, (SLAB_RECLAIM_ACCOUNT |
 164                                                  SLAB_MEM_SPREAD),
 165                                              init_once);
 166         if (!udf_inode_cachep)
 167                 return -ENOMEM;
 168         return 0;
 169 }
 170
 171 static void destroy_inodecache(void)
 172 {
 173         kmem_cache_destroy(udf_inode_cachep);
 174 }
 175
 176 /* Superblock operations */
 177 static const struct super_operations udf_sb_ops = {
 178         .alloc_inode    = udf_alloc_inode,
 179         .destroy_inode  = udf_destroy_inode,
 180         .write_inode    = udf_write_inode,
 181         .delete_inode   = udf_delete_inode,
 182         .clear_inode    = udf_clear_inode,
 183         .put_super      = udf_put_super,
 184         .write_super    = udf_write_super,
 185         .statfs         = udf_statfs,
 186         .remount_fs     = udf_remount_fs,
 187         .show_options   = udf_show_options,
 188 };
 189
 190 struct udf_options {
 191         unsigned char novrs;
 192         unsigned int blocksize;
 193         unsigned int session;
 194         unsigned int lastblock;
 195         unsigned int anchor;
 196         unsigned int volume;
 197         unsigned short partition;
 198         unsigned int fileset;
 199         unsigned int rootdir;
 200         unsigned int flags;
 201         mode_t umask;
 202         gid_t gid;
 203         uid_t uid;
 204         struct nls_table *nls_map;
 205 };
 206
 207 static int __init init_udf_fs(void)
 208 {
 209         int err;
 210
 211         err = init_inodecache();
 212         if (err)
 213                 goto out1;
 214         err = register_filesystem(&udf_fstype);
 215         if (err)
 216                 goto out;
 217
 218         return 0;
 219
 220 out:
 221         destroy_inodecache();
 222
 223 out1:
 224         return err;
 225 }
 226
 227 static void __exit exit_udf_fs(void)
 228 {
 229         unregister_filesystem(&udf_fstype);
 230         destroy_inodecache();
 231 }
 232
 233 module_init(init_udf_fs)
 234 module_exit(exit_udf_fs)
 235
 236 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
 237 {
 238         struct udf_sb_info *sbi = UDF_SB(sb);
 239
 240         sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map),
 241                                   GFP_KERNEL);
 242         if (!sbi->s_partmaps) {
 243                 udf_error(sb, __FUNCTION__,
 244                           "Unable to allocate space for %d partition maps",
 245                           count);
 246                 sbi->s_partitions = 0;
 247                 return -ENOMEM;
 248         }
 249
 250         sbi->s_partitions = count;
 251         return 0;
 252 }
 253
 254 static int udf_show_options(struct seq_file *seq, struct vfsmount *mnt)
 255 {
 256         struct super_block *sb = mnt->mnt_sb;
 257         struct udf_sb_info *sbi = UDF_SB(sb);
 258
 259         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
 260                 seq_puts(seq, ",nostrict");
 261         if (sb->s_blocksize != UDF_DEFAULT_BLOCKSIZE)
 262                 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
 263         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
 264                 seq_puts(seq, ",unhide");
 265         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
 266                 seq_puts(seq, ",undelete");
 267         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
 268                 seq_puts(seq, ",noadinicb");
 269         if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
 270                 seq_puts(seq, ",shortad");
 271         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
 272                 seq_puts(seq, ",uid=forget");
 273         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_IGNORE))
 274                 seq_puts(seq, ",uid=ignore");
 275         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
 276                 seq_puts(seq, ",gid=forget");
 277         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE))
 278                 seq_puts(seq, ",gid=ignore");
 279         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
 280                 seq_printf(seq, ",uid=%u", sbi->s_uid);
 281         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
 282                 seq_printf(seq, ",gid=%u", sbi->s_gid);
 283         if (sbi->s_umask != 0)
 284                 seq_printf(seq, ",umask=%o", sbi->s_umask);
 285         if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
 286                 seq_printf(seq, ",session=%u", sbi->s_session);
 287         if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
 288                 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
 289         /*
 290          * s_anchor[2] could be zeroed out in case there is no anchor
 291          * in the specified block, but then the "anchor=N" option
 292          * originally given by the user wasn't effective, so it's OK
 293          * if we don't show it.
 294          */
 295         if (sbi->s_anchor[2] != 0)
 296                 seq_printf(seq, ",anchor=%u", sbi->s_anchor[2]);
 297         /*
 298          * volume, partition, fileset and rootdir seem to be ignored
 299          * currently
 300          */
 301         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
 302                 seq_puts(seq, ",utf8");
 303         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
 304                 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
 305
 306         return 0;
 307 }
 308
 309 /*
 310  * udf_parse_options
 311  *
 312  * PURPOSE
 313  *      Parse mount options.
 314  *
 315  * DESCRIPTION
 316  *      The following mount options are supported:
 317  *
 318  *      gid=            Set the default group.
 319  *      umask=          Set the default umask.
 320  *      uid=            Set the default user.
 321  *      bs=             Set the block size.
 322  *      unhide          Show otherwise hidden files.
 323  *      undelete        Show deleted files in lists.
 324  *      adinicb         Embed data in the inode (default)
 325  *      noadinicb       Don't embed data in the inode
 326  *      shortad         Use short ad's
 327  *      longad          Use long ad's (default)
 328  *      nostrict        Unset strict conformance
 329  *      iocharset=      Set the NLS character set
 330  *
 331  *      The remaining are for debugging and disaster recovery:
 332  *
 333  *      novrs           Skip volume sequence recognition
 334  *
 335  *      The following expect a offset from 0.
 336  *
 337  *      session=        Set the CDROM session (default= last session)
 338  *      anchor=         Override standard anchor location. (default= 256)
 339  *      volume=         Override the VolumeDesc location. (unused)
 340  *      partition=      Override the PartitionDesc location. (unused)
 341  *      lastblock=      Set the last block of the filesystem/
 342  *
 343  *      The following expect a offset from the partition root.
 344  *
 345  *      fileset=        Override the fileset block location. (unused)
 346  *      rootdir=        Override the root directory location. (unused)
 347  *              WARNING: overriding the rootdir to a non-directory may
 348  *              yield highly unpredictable results.
 349  *
 350  * PRE-CONDITIONS
 351  *      options         Pointer to mount options string.
 352  *      uopts           Pointer to mount options variable.
 353  *
 354  * POST-CONDITIONS
 355  *      <return>        1       Mount options parsed okay.
 356  *      <return>        0       Error parsing mount options.
 357  *
 358  * HISTORY
 359  *      July 1, 1997 - Andrew E. Mileski
 360  *      Written, tested, and released.
 361  */
 362
 363 enum {
 364         Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
 365         Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
 366         Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
 367         Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
 368         Opt_rootdir, Opt_utf8, Opt_iocharset,
 369         Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore
 370 };
 371
 372 static match_table_t tokens = {
 373         {Opt_novrs,     "novrs"},
 374         {Opt_nostrict,  "nostrict"},
 375         {Opt_bs,        "bs=%u"},
 376         {Opt_unhide,    "unhide"},
 377         {Opt_undelete,  "undelete"},
 378         {Opt_noadinicb, "noadinicb"},
 379         {Opt_adinicb,   "adinicb"},
 380         {Opt_shortad,   "shortad"},
 381         {Opt_longad,    "longad"},
 382         {Opt_uforget,   "uid=forget"},
 383         {Opt_uignore,   "uid=ignore"},
 384         {Opt_gforget,   "gid=forget"},
 385         {Opt_gignore,   "gid=ignore"},
 386         {Opt_gid,       "gid=%u"},
 387         {Opt_uid,       "uid=%u"},
 388         {Opt_umask,     "umask=%o"},
 389         {Opt_session,   "session=%u"},
 390         {Opt_lastblock, "lastblock=%u"},
 391         {Opt_anchor,    "anchor=%u"},
 392         {Opt_volume,    "volume=%u"},
 393         {Opt_partition, "partition=%u"},
 394         {Opt_fileset,   "fileset=%u"},
 395         {Opt_rootdir,   "rootdir=%u"},
 396         {Opt_utf8,      "utf8"},
 397         {Opt_iocharset, "iocharset=%s"},
 398         {Opt_err,       NULL}
 399 };
 400
 401 static int udf_parse_options(char *options, struct udf_options *uopt,
 402                              bool remount)
 403 {
 404         char *p;
 405         int option;
 406
 407         uopt->novrs = 0;
 408         uopt->blocksize = UDF_DEFAULT_BLOCKSIZE;
 409         uopt->partition = 0xFFFF;
 410         uopt->session = 0xFFFFFFFF;
 411         uopt->lastblock = 0;
 412         uopt->anchor = 0;
 413         uopt->volume = 0xFFFFFFFF;
 414         uopt->rootdir = 0xFFFFFFFF;
 415         uopt->fileset = 0xFFFFFFFF;
 416         uopt->nls_map = NULL;
 417
 418         if (!options)
 419                 return 1;
 420
 421         while ((p = strsep(&options, ",")) != NULL) {
 422                 substring_t args[MAX_OPT_ARGS];
 423                 int token;
 424                 if (!*p)
 425                         continue;
 426
 427                 token = match_token(p, tokens, args);
 428                 switch (token) {
 429                 case Opt_novrs:
 430                         uopt->novrs = 1;
 431                 case Opt_bs:
 432                         if (match_int(&args[0], &option))
 433                                 return 0;
 434                         uopt->blocksize = option;
 435                         break;
 436                 case Opt_unhide:
 437                         uopt->flags |= (1 << UDF_FLAG_UNHIDE);
 438                         break;
 439                 case Opt_undelete:
 440                         uopt->flags |= (1 << UDF_FLAG_UNDELETE);
 441                         break;
 442                 case Opt_noadinicb:
 443                         uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
 444                         break;
 445                 case Opt_adinicb:
 446                         uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
 447                         break;
 448                 case Opt_shortad:
 449                         uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
 450                         break;
 451                 case Opt_longad:
 452                         uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
 453                         break;
 454                 case Opt_gid:
 455                         if (match_int(args, &option))
 456                                 return 0;
 457                         uopt->gid = option;
 458                         uopt->flags |= (1 << UDF_FLAG_GID_SET);
 459                         break;
 460                 case Opt_uid:
 461                         if (match_int(args, &option))
 462                                 return 0;
 463                         uopt->uid = option;
 464                         uopt->flags |= (1 << UDF_FLAG_UID_SET);
 465                         break;
 466                 case Opt_umask:
 467                         if (match_octal(args, &option))
 468                                 return 0;
 469                         uopt->umask = option;
 470                         break;
 471                 case Opt_nostrict:
 472                         uopt->flags &= ~(1 << UDF_FLAG_STRICT);
 473                         break;
 474                 case Opt_session:
 475                         if (match_int(args, &option))
 476                                 return 0;
 477                         uopt->session = option;
 478                         if (!remount)
 479                                 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
 480                         break;
 481                 case Opt_lastblock:
 482                         if (match_int(args, &option))
 483                                 return 0;
 484                         uopt->lastblock = option;
 485                         if (!remount)
 486                                 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
 487                         break;
 488                 case Opt_anchor:
 489                         if (match_int(args, &option))
 490                                 return 0;
 491                         uopt->anchor = option;
 492                         break;
 493                 case Opt_volume:
 494                         if (match_int(args, &option))
 495                                 return 0;
 496                         uopt->volume = option;
 497                         break;
 498                 case Opt_partition:
 499                         if (match_int(args, &option))
 500                                 return 0;
 501                         uopt->partition = option;
 502                         break;
 503                 case Opt_fileset:
 504                         if (match_int(args, &option))
 505                                 return 0;
 506                         uopt->fileset = option;
 507                         break;
 508                 case Opt_rootdir:
 509                         if (match_int(args, &option))
 510                                 return 0;
 511                         uopt->rootdir = option;
 512                         break;
 513                 case Opt_utf8:
 514                         uopt->flags |= (1 << UDF_FLAG_UTF8);
 515                         break;
 516 #ifdef CONFIG_UDF_NLS
 517                 case Opt_iocharset:
 518                         uopt->nls_map = load_nls(args[0].from);
 519                         uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
 520                         break;
 521 #endif
 522                 case Opt_uignore:
 523                         uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
 524                         break;
 525                 case Opt_uforget:
 526                         uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
 527                         break;
 528                 case Opt_gignore:
 529                         uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
 530                         break;
 531                 case Opt_gforget:
 532                         uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
 533                         break;
 534                 default:
 535                         printk(KERN_ERR "udf: bad mount option \"%s\" "
 536                                "or missing value\n", p);
 537                         return 0;
 538                 }
 539         }
 540         return 1;
 541 }
 542
 543 static void udf_write_super(struct super_block *sb)
 544 {
 545         lock_kernel();
 546
 547         if (!(sb->s_flags & MS_RDONLY))
 548                 udf_open_lvid(sb);
 549         sb->s_dirt = 0;
 550
 551         unlock_kernel();
 552 }
 553
 554 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
 555 {
 556         struct udf_options uopt;
 557         struct udf_sb_info *sbi = UDF_SB(sb);
 558
 559         uopt.flags = sbi->s_flags;
 560         uopt.uid   = sbi->s_uid;
 561         uopt.gid   = sbi->s_gid;
 562         uopt.umask = sbi->s_umask;
 563
 564         if (!udf_parse_options(options, &uopt, true))
 565                 return -EINVAL;
 566
 567         sbi->s_flags = uopt.flags;
 568         sbi->s_uid   = uopt.uid;
 569         sbi->s_gid   = uopt.gid;
 570         sbi->s_umask = uopt.umask;
 571
 572         if (sbi->s_lvid_bh) {
 573                 int write_rev = le16_to_cpu(udf_sb_lvidiu(sbi)->minUDFWriteRev);
 574                 if (write_rev > UDF_MAX_WRITE_VERSION)
 575                         *flags |= MS_RDONLY;
 576         }
 577
 578         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 579                 return 0;
 580         if (*flags & MS_RDONLY)
 581                 udf_close_lvid(sb);
 582         else
 583                 udf_open_lvid(sb);
 584
 585         return 0;
 586 }
 587
 588 static int udf_vrs(struct super_block *sb, int silent)
 589 {
 590         struct volStructDesc *vsd = NULL;
 591         loff_t sector = 32768;
 592         int sectorsize;
 593         struct buffer_head *bh = NULL;
 594         int iso9660 = 0;
 595         int nsr02 = 0;
 596         int nsr03 = 0;
 597         struct udf_sb_info *sbi;
 598
 599         /* Block size must be a multiple of 512 */
 600         if (sb->s_blocksize & 511)
 601                 return 0;
 602         sbi = UDF_SB(sb);
 603
 604         if (sb->s_blocksize < sizeof(struct volStructDesc))
 605                 sectorsize = sizeof(struct volStructDesc);
 606         else
 607                 sectorsize = sb->s_blocksize;
 608
 609         sector += (sbi->s_session << sb->s_blocksize_bits);
 610
 611         udf_debug("Starting at sector %u (%ld byte sectors)\n",
 612                   (unsigned int)(sector >> sb->s_blocksize_bits),
 613                   sb->s_blocksize);
 614         /* Process the sequence (if applicable) */
 615         for (; !nsr02 && !nsr03; sector += sectorsize) {
 616                 /* Read a block */
 617                 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
 618                 if (!bh)
 619                         break;
 620
 621                 /* Look for ISO  descriptors */
 622                 vsd = (struct volStructDesc *)(bh->b_data +
 623                                               (sector & (sb->s_blocksize - 1)));
 624
 625                 if (vsd->stdIdent[0] == 0) {
 626                         brelse(bh);
 627                         break;
 628                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
 629                                     VSD_STD_ID_LEN)) {
 630                         iso9660 = sector;
 631                         switch (vsd->structType) {
 632                         case 0:
 633                                 udf_debug("ISO9660 Boot Record found\n");
 634                                 break;
 635                         case 1:
 636                                 udf_debug("ISO9660 Primary Volume Descriptor "
 637                                           "found\n");
 638                                 break;
 639                         case 2:
 640                                 udf_debug("ISO9660 Supplementary Volume "
 641                                           "Descriptor found\n");
 642                                 break;
 643                         case 3:
 644                                 udf_debug("ISO9660 Volume Partition Descriptor "
 645                                           "found\n");
 646                                 break;
 647                         case 255:
 648                                 udf_debug("ISO9660 Volume Descriptor Set "
 649                                           "Terminator found\n");
 650                                 break;
 651                         default:
 652                                 udf_debug("ISO9660 VRS (%u) found\n",
 653                                           vsd->structType);
 654                                 break;
 655                         }
 656                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
 657                                     VSD_STD_ID_LEN))
 658                         ; /* nothing */
 659                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
 660                                     VSD_STD_ID_LEN)) {
 661                         brelse(bh);
 662                         break;
 663                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
 664                                     VSD_STD_ID_LEN))
 665                         nsr02 = sector;
 666                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
 667                                     VSD_STD_ID_LEN))
 668                         nsr03 = sector;
 669                 brelse(bh);
 670         }
 671
 672         if (nsr03)
 673                 return nsr03;
 674         else if (nsr02)
 675                 return nsr02;
 676         else if (sector - (sbi->s_session << sb->s_blocksize_bits) == 32768)
 677                 return -1;
 678         else
 679                 return 0;
 680 }
 681
 682 /*
 683  * Check whether there is an anchor block in the given block
 684  */
 685 static int udf_check_anchor_block(struct super_block *sb, sector_t block,
 686                                         bool varconv)
 687 {
 688         struct buffer_head *bh = NULL;
 689         tag *t;
 690         uint16_t ident;
 691         uint32_t location;
 692
 693         if (varconv) {
 694                 if (udf_fixed_to_variable(block) >=
 695                     sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits)
 696                         return 0;
 697                 bh = sb_bread(sb, udf_fixed_to_variable(block));
 698         }
 699         else
 700                 bh = sb_bread(sb, block);
 701
 702         if (!bh)
 703                 return 0;
 704
 705         t = (tag *)bh->b_data;
 706         ident = le16_to_cpu(t->tagIdent);
 707         location = le32_to_cpu(t->tagLocation);
 708         brelse(bh);
 709         if (ident != TAG_IDENT_AVDP)
 710                 return 0;
 711         return location == block;
 712 }
 713
 714 /* Search for an anchor volume descriptor pointer */
 715 static sector_t udf_scan_anchors(struct super_block *sb, bool varconv,
 716                                         sector_t lastblock)
 717 {
 718         sector_t last[6];
 719         int i;
 720         struct udf_sb_info *sbi = UDF_SB(sb);
 721
 722         last[0] = lastblock;
 723         last[1] = last[0] - 1;
 724         last[2] = last[0] + 1;
 725         last[3] = last[0] - 2;
 726         last[4] = last[0] - 150;
 727         last[5] = last[0] - 152;
 728
 729         /*  according to spec, anchor is in either:
 730          *     block 256
 731          *     lastblock-256
 732          *     lastblock
 733          *  however, if the disc isn't closed, it could be 512 */
 734
 735         for (i = 0; i < ARRAY_SIZE(last); i++) {
 736                 if (last[i] < 0)
 737                         continue;
 738                 if (last[i] >= sb->s_bdev->bd_inode->i_size >>
 739                                 sb->s_blocksize_bits)
 740                         continue;
 741
 742                 if (udf_check_anchor_block(sb, last[i], varconv)) {
 743                         sbi->s_anchor[0] = last[i];
 744                         sbi->s_anchor[1] = last[i] - 256;
 745                         return last[i];
 746                 }
 747
 748                 if (last[i] < 256)
 749                         continue;
 750
 751                 if (udf_check_anchor_block(sb, last[i] - 256, varconv)) {
 752                         sbi->s_anchor[1] = last[i] - 256;
 753                         return last[i];
 754                 }
 755         }
 756
 757         if (udf_check_anchor_block(sb, sbi->s_session + 256, varconv)) {
 758                 sbi->s_anchor[0] = sbi->s_session + 256;
 759                 return last[0];
 760         }
 761         if (udf_check_anchor_block(sb, sbi->s_session + 512, varconv)) {
 762                 sbi->s_anchor[0] = sbi->s_session + 512;
 763                 return last[0];
 764         }
 765         return 0;
 766 }
 767
 768 /*
 769  * Find an anchor volume descriptor. The function expects sbi->s_lastblock to
 770  * be the last block on the media.
 771  *
 772  * Return 1 if not found, 0 if ok
 773  *
 774  */
 775 static void udf_find_anchor(struct super_block *sb)
 776 {
 777         sector_t lastblock;
 778         struct buffer_head *bh = NULL;
 779         uint16_t ident;
 780         int i;
 781         struct udf_sb_info *sbi = UDF_SB(sb);
 782
 783         lastblock = udf_scan_anchors(sb, 0, sbi->s_last_block);
 784         if (lastblock)
 785                 goto check_anchor;
 786
 787         /* No anchor found? Try VARCONV conversion of block numbers */
 788         /* Firstly, we try to not convert number of the last block */
 789         lastblock = udf_scan_anchors(sb, 1,
 790                                 udf_variable_to_fixed(sbi->s_last_block));
 791         if (lastblock) {
 792                 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
 793                 goto check_anchor;
 794         }
 795
 796         /* Secondly, we try with converted number of the last block */
 797         lastblock = udf_scan_anchors(sb, 1, sbi->s_last_block);
 798         if (lastblock)
 799                 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
 800
 801 check_anchor:
 802         /*
 803          * Check located anchors and the anchor block supplied via
 804          * mount options
 805          */
 806         for (i = 0; i < ARRAY_SIZE(sbi->s_anchor); i++) {
 807                 if (!sbi->s_anchor[i])
 808                         continue;
 809                 bh = udf_read_tagged(sb, sbi->s_anchor[i],
 810                                         sbi->s_anchor[i], &ident);
 811                 if (!bh)
 812                         sbi->s_anchor[i] = 0;
 813                 else {
 814                         brelse(bh);
 815                         if (ident != TAG_IDENT_AVDP)
 816                                 sbi->s_anchor[i] = 0;
 817                 }
 818         }
 819
 820         sbi->s_last_block = lastblock;
 821 }
 822
 823 static int udf_find_fileset(struct super_block *sb,
 824                             kernel_lb_addr *fileset,
 825                             kernel_lb_addr *root)
 826 {
 827         struct buffer_head *bh = NULL;
 828         long lastblock;
 829         uint16_t ident;
 830         struct udf_sb_info *sbi;
 831
 832         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
 833             fileset->partitionReferenceNum != 0xFFFF) {
 834                 bh = udf_read_ptagged(sb, *fileset, 0, &ident);
 835
 836                 if (!bh) {
 837                         return 1;
 838                 } else if (ident != TAG_IDENT_FSD) {
 839                         brelse(bh);
 840                         return 1;
 841                 }
 842
 843         }
 844
 845         sbi = UDF_SB(sb);
 846         if (!bh) {
 847                 /* Search backwards through the partitions */
 848                 kernel_lb_addr newfileset;
 849
 850 /* --> cvg: FIXME - is it reasonable? */
 851                 return 1;
 852
 853                 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
 854                      (newfileset.partitionReferenceNum != 0xFFFF &&
 855                       fileset->logicalBlockNum == 0xFFFFFFFF &&
 856                       fileset->partitionReferenceNum == 0xFFFF);
 857                      newfileset.partitionReferenceNum--) {
 858                         lastblock = sbi->s_partmaps
 859                                         [newfileset.partitionReferenceNum]
 860                                                 .s_partition_len;
 861                         newfileset.logicalBlockNum = 0;
 862
 863                         do {
 864                                 bh = udf_read_ptagged(sb, newfileset, 0,
 865                                                       &ident);
 866                                 if (!bh) {
 867                                         newfileset.logicalBlockNum++;
 868                                         continue;
 869                                 }
 870
 871                                 switch (ident) {
 872                                 case TAG_IDENT_SBD:
 873                                 {
 874                                         struct spaceBitmapDesc *sp;
 875                                         sp = (struct spaceBitmapDesc *)
 876                                                                 bh->b_data;
 877                                         newfileset.logicalBlockNum += 1 +
 878                                                 ((le32_to_cpu(sp->numOfBytes) +
 879                                                   sizeof(struct spaceBitmapDesc)
 880                                                   - 1) >> sb->s_blocksize_bits);
 881                                         brelse(bh);
 882                                         break;
 883                                 }
 884                                 case TAG_IDENT_FSD:
 885                                         *fileset = newfileset;
 886                                         break;
 887                                 default:
 888                                         newfileset.logicalBlockNum++;
 889                                         brelse(bh);
 890                                         bh = NULL;
 891                                         break;
 892                                 }
 893                         } while (newfileset.logicalBlockNum < lastblock &&
 894                                  fileset->logicalBlockNum == 0xFFFFFFFF &&
 895                                  fileset->partitionReferenceNum == 0xFFFF);
 896                 }
 897         }
 898
 899         if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
 900              fileset->partitionReferenceNum != 0xFFFF) && bh) {
 901                 udf_debug("Fileset at block=%d, partition=%d\n",
 902                           fileset->logicalBlockNum,
 903                           fileset->partitionReferenceNum);
 904
 905                 sbi->s_partition = fileset->partitionReferenceNum;
 906                 udf_load_fileset(sb, bh, root);
 907                 brelse(bh);
 908                 return 0;
 909         }
 910         return 1;
 911 }
 912
 913 static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
 914 {
 915         struct primaryVolDesc *pvoldesc;
 916         struct ustr instr;
 917         struct ustr outstr;
 918         struct buffer_head *bh;
 919         uint16_t ident;
 920
 921         bh = udf_read_tagged(sb, block, block, &ident);
 922         if (!bh)
 923                 return 1;
 924         BUG_ON(ident != TAG_IDENT_PVD);
 925
 926         pvoldesc = (struct primaryVolDesc *)bh->b_data;
 927
 928         if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
 929                               pvoldesc->recordingDateAndTime)) {
 930 #ifdef UDFFS_DEBUG
 931                 timestamp *ts = &pvoldesc->recordingDateAndTime;
 932                 udf_debug("recording time %04u/%02u/%02u"
 933                           " %02u:%02u (%x)\n",
 934                           le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
 935                           ts->minute, le16_to_cpu(ts->typeAndTimezone));
 936 #endif
 937         }
 938
 939         if (!udf_build_ustr(&instr, pvoldesc->volIdent, 32))
 940                 if (udf_CS0toUTF8(&outstr, &instr)) {
 941                         strncpy(UDF_SB(sb)->s_volume_ident, outstr.u_name,
 942                                 outstr.u_len > 31 ? 31 : outstr.u_len);
 943                         udf_debug("volIdent[] = '%s'\n",
 944                                         UDF_SB(sb)->s_volume_ident);
 945                 }
 946
 947         if (!udf_build_ustr(&instr, pvoldesc->volSetIdent, 128))
 948                 if (udf_CS0toUTF8(&outstr, &instr))
 949                         udf_debug("volSetIdent[] = '%s'\n", outstr.u_name);
 950
 951         brelse(bh);
 952         return 0;
 953 }
 954
 955 static int udf_load_metadata_files(struct super_block *sb, int partition)
 956 {
 957         struct udf_sb_info *sbi = UDF_SB(sb);
 958         struct udf_part_map *map;
 959         struct udf_meta_data *mdata;
 960         kernel_lb_addr addr;
 961         int fe_error = 0;
 962
 963         map = &sbi->s_partmaps[partition];
 964         mdata = &map->s_type_specific.s_metadata;
 965
 966         /* metadata address */
 967         addr.logicalBlockNum =  mdata->s_meta_file_loc;
 968         addr.partitionReferenceNum = map->s_partition_num;
 969
 970         udf_debug("Metadata file location: block = %d part = %d\n",
 971                           addr.logicalBlockNum, addr.partitionReferenceNum);
 972
 973         mdata->s_metadata_fe = udf_iget(sb, addr);
 974
 975         if (mdata->s_metadata_fe == NULL) {
 976                 udf_warning(sb, __func__, "metadata inode efe not found, "
 977                                 "will try mirror inode.");
 978                 fe_error = 1;
 979         } else if (UDF_I(mdata->s_metadata_fe)->i_alloc_type !=
 980                  ICBTAG_FLAG_AD_SHORT) {
 981                 udf_warning(sb, __func__, "metadata inode efe does not have "
 982                         "short allocation descriptors!");
 983                 fe_error = 1;
 984                 iput(mdata->s_metadata_fe);
 985                 mdata->s_metadata_fe = NULL;
 986         }
 987
 988         /* mirror file entry */
 989         addr.logicalBlockNum = mdata->s_mirror_file_loc;
 990         addr.partitionReferenceNum = map->s_partition_num;
 991
 992         udf_debug("Mirror metadata file location: block = %d part = %d\n",
 993                           addr.logicalBlockNum, addr.partitionReferenceNum);
 994
 995         mdata->s_mirror_fe = udf_iget(sb, addr);
 996
 997         if (mdata->s_mirror_fe == NULL) {
 998                 if (fe_error) {
 999                         udf_error(sb, __func__, "mirror inode efe not found "
1000                         "and metadata inode is missing too, exiting...");
1001                         goto error_exit;
1002                 } else
1003                         udf_warning(sb, __func__, "mirror inode efe not found,"
1004                                         " but metadata inode is OK");
1005         } else if (UDF_I(mdata->s_mirror_fe)->i_alloc_type !=
1006                  ICBTAG_FLAG_AD_SHORT) {
1007                 udf_warning(sb, __func__, "mirror inode efe does not have "
1008                         "short allocation descriptors!");
1009                 iput(mdata->s_mirror_fe);
1010                 mdata->s_mirror_fe = NULL;
1011                 if (fe_error)
1012                         goto error_exit;
1013         }
1014
1015         /*
1016          * bitmap file entry
1017          * Note:
1018          * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
1019         */
1020         if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
1021                 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
1022                 addr.partitionReferenceNum = map->s_partition_num;
1023
1024                 udf_debug("Bitmap file location: block = %d part = %d\n",
1025                         addr.logicalBlockNum, addr.partitionReferenceNum);
1026
1027                 mdata->s_bitmap_fe = udf_iget(sb, addr);
1028
1029                 if (mdata->s_bitmap_fe == NULL) {
1030                         if (sb->s_flags & MS_RDONLY)
1031                                 udf_warning(sb, __func__, "bitmap inode efe "
1032                                         "not found but it's ok since the disc"
1033                                         " is mounted read-only");
1034                         else {
1035                                 udf_error(sb, __func__, "bitmap inode efe not "
1036                                         "found and attempted read-write mount");
1037                                 goto error_exit;
1038                         }
1039                 }
1040         }
1041
1042         udf_debug("udf_load_metadata_files Ok\n");
1043
1044         return 0;
1045
1046 error_exit:
1047         return 1;
1048 }
1049
1050 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
1051                              kernel_lb_addr *root)
1052 {
1053         struct fileSetDesc *fset;
1054
1055         fset = (struct fileSetDesc *)bh->b_data;
1056
1057         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
1058
1059         UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
1060
1061         udf_debug("Rootdir at block=%d, partition=%d\n",
1062                   root->logicalBlockNum, root->partitionReferenceNum);
1063 }
1064
1065 int udf_compute_nr_groups(struct super_block *sb, u32 partition)
1066 {
1067         struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
1068         return DIV_ROUND_UP(map->s_partition_len +
1069                             (sizeof(struct spaceBitmapDesc) << 3),
1070                             sb->s_blocksize * 8);
1071 }
1072
1073 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
1074 {
1075         struct udf_bitmap *bitmap;
1076         int nr_groups;
1077         int size;
1078
1079         nr_groups = udf_compute_nr_groups(sb, index);
1080         size = sizeof(struct udf_bitmap) +
1081                 (sizeof(struct buffer_head *) * nr_groups);
1082
1083         if (size <= PAGE_SIZE)
1084                 bitmap = kmalloc(size, GFP_KERNEL);
1085         else
1086                 bitmap = vmalloc(size); /* TODO: get rid of vmalloc */
1087
1088         if (bitmap == NULL) {
1089                 udf_error(sb, __FUNCTION__,
1090                           "Unable to allocate space for bitmap "
1091                           "and %d buffer_head pointers", nr_groups);
1092                 return NULL;
1093         }
1094
1095         memset(bitmap, 0x00, size);
1096         bitmap->s_block_bitmap = (struct buffer_head **)(bitmap + 1);
1097         bitmap->s_nr_groups = nr_groups;
1098         return bitmap;
1099 }
1100
1101 static int udf_fill_partdesc_info(struct super_block *sb,
1102                 struct partitionDesc *p, int p_index)
1103 {
1104         struct udf_part_map *map;
1105         struct udf_sb_info *sbi = UDF_SB(sb);
1106         struct partitionHeaderDesc *phd;
1107
1108         map = &sbi->s_partmaps[p_index];
1109
1110         map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
1111         map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
1112
1113         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
1114                 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
1115         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
1116                 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
1117         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
1118                 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
1119         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
1120                 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
1121
1122         udf_debug("Partition (%d type %x) starts at physical %d, "
1123                   "block length %d\n", p_index,
1124                   map->s_partition_type, map->s_partition_root,
1125                   map->s_partition_len);
1126
1127         if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1128             strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
1129                 return 0;
1130
1131         phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1132         if (phd->unallocSpaceTable.extLength) {
1133                 kernel_lb_addr loc = {
1134                         .logicalBlockNum = le32_to_cpu(
1135                                 phd->unallocSpaceTable.extPosition),
1136                         .partitionReferenceNum = p_index,
1137                 };
1138
1139                 map->s_uspace.s_table = udf_iget(sb, loc);
1140                 if (!map->s_uspace.s_table) {
1141                         udf_debug("cannot load unallocSpaceTable (part %d)\n",
1142                                         p_index);
1143                         return 1;
1144                 }
1145                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1146                 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
1147                                 p_index, map->s_uspace.s_table->i_ino);
1148         }
1149
1150         if (phd->unallocSpaceBitmap.extLength) {
1151                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1152                 if (!bitmap)
1153                         return 1;
1154                 map->s_uspace.s_bitmap = bitmap;
1155                 bitmap->s_extLength = le32_to_cpu(
1156                                 phd->unallocSpaceBitmap.extLength);
1157                 bitmap->s_extPosition = le32_to_cpu(
1158                                 phd->unallocSpaceBitmap.extPosition);
1159                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1160                 udf_debug("unallocSpaceBitmap (part %d) @ %d\n", p_index,
1161                                                 bitmap->s_extPosition);
1162         }
1163
1164         if (phd->partitionIntegrityTable.extLength)
1165                 udf_debug("partitionIntegrityTable (part %d)\n", p_index);
1166
1167         if (phd->freedSpaceTable.extLength) {
1168                 kernel_lb_addr loc = {
1169                         .logicalBlockNum = le32_to_cpu(
1170                                 phd->freedSpaceTable.extPosition),
1171                         .partitionReferenceNum = p_index,
1172                 };
1173
1174                 map->s_fspace.s_table = udf_iget(sb, loc);
1175                 if (!map->s_fspace.s_table) {
1176                         udf_debug("cannot load freedSpaceTable (part %d)\n",
1177                                 p_index);
1178                         return 1;
1179                 }
1180
1181                 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
1182                 udf_debug("freedSpaceTable (part %d) @ %ld\n",
1183                                 p_index, map->s_fspace.s_table->i_ino);
1184         }
1185
1186         if (phd->freedSpaceBitmap.extLength) {
1187                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1188                 if (!bitmap)
1189                         return 1;
1190                 map->s_fspace.s_bitmap = bitmap;
1191                 bitmap->s_extLength = le32_to_cpu(
1192                                 phd->freedSpaceBitmap.extLength);
1193                 bitmap->s_extPosition = le32_to_cpu(
1194                                 phd->freedSpaceBitmap.extPosition);
1195                 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1196                 udf_debug("freedSpaceBitmap (part %d) @ %d\n", p_index,
1197                                         bitmap->s_extPosition);
1198         }
1199         return 0;
1200 }
1201
1202 static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1203 {
1204         struct udf_sb_info *sbi = UDF_SB(sb);
1205         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1206         kernel_lb_addr ino;
1207         struct buffer_head *bh = NULL;
1208         struct udf_inode_info *vati;
1209         uint32_t pos;
1210         struct virtualAllocationTable20 *vat20;
1211
1212         /* VAT file entry is in the last recorded block */
1213         ino.partitionReferenceNum = type1_index;
1214         ino.logicalBlockNum = sbi->s_last_block - map->s_partition_root;
1215         sbi->s_vat_inode = udf_iget(sb, ino);
1216         if (!sbi->s_vat_inode)
1217                 return 1;
1218
1219         if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1220                 map->s_type_specific.s_virtual.s_start_offset = 0;
1221                 map->s_type_specific.s_virtual.s_num_entries =
1222                         (sbi->s_vat_inode->i_size - 36) >> 2;
1223         } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1224                 vati = UDF_I(sbi->s_vat_inode);
1225                 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1226                         pos = udf_block_map(sbi->s_vat_inode, 0);
1227                         bh = sb_bread(sb, pos);
1228                         if (!bh)
1229                                 return 1;
1230                         vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1231                 } else {
1232                         vat20 = (struct virtualAllocationTable20 *)
1233                                                         vati->i_ext.i_data;
1234                 }
1235
1236                 map->s_type_specific.s_virtual.s_start_offset =
1237                         le16_to_cpu(vat20->lengthHeader);
1238                 map->s_type_specific.s_virtual.s_num_entries =
1239                         (sbi->s_vat_inode->i_size -
1240                                 map->s_type_specific.s_virtual.
1241                                         s_start_offset) >> 2;
1242                 brelse(bh);
1243         }
1244         return 0;
1245 }
1246
1247 static int udf_load_partdesc(struct super_block *sb, sector_t block)
1248 {
1249         struct buffer_head *bh;
1250         struct partitionDesc *p;
1251         struct udf_part_map *map;
1252         struct udf_sb_info *sbi = UDF_SB(sb);
1253         int i, type1_idx;
1254         uint16_t partitionNumber;
1255         uint16_t ident;
1256         int ret = 0;
1257
1258         bh = udf_read_tagged(sb, block, block, &ident);
1259         if (!bh)
1260                 return 1;
1261         if (ident != TAG_IDENT_PD)
1262                 goto out_bh;
1263
1264         p = (struct partitionDesc *)bh->b_data;
1265         partitionNumber = le16_to_cpu(p->partitionNumber);
1266
1267         /* First scan for TYPE1, SPARABLE and METADATA partitions */
1268         for (i = 0; i < sbi->s_partitions; i++) {
1269                 map = &sbi->s_partmaps[i];
1270                 udf_debug("Searching map: (%d == %d)\n",
1271                           map->s_partition_num, partitionNumber);
1272                 if (map->s_partition_num == partitionNumber &&
1273                     (map->s_partition_type == UDF_TYPE1_MAP15 ||
1274                      map->s_partition_type == UDF_SPARABLE_MAP15))
1275                         break;
1276         }
1277
1278         if (i >= sbi->s_partitions) {
1279                 udf_debug("Partition (%d) not found in partition map\n",
1280                           partitionNumber);
1281                 goto out_bh;
1282         }
1283
1284         ret = udf_fill_partdesc_info(sb, p, i);
1285
1286         /*
1287          * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1288          * PHYSICAL partitions are already set up
1289          */
1290         type1_idx = i;
1291         for (i = 0; i < sbi->s_partitions; i++) {
1292                 map = &sbi->s_partmaps[i];
1293
1294                 if (map->s_partition_num == partitionNumber &&
1295                     (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1296                      map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1297                      map->s_partition_type == UDF_METADATA_MAP25))
1298                         break;
1299         }
1300
1301         if (i >= sbi->s_partitions)
1302                 goto out_bh;
1303
1304         ret = udf_fill_partdesc_info(sb, p, i);
1305         if (ret)
1306                 goto out_bh;
1307
1308         if (map->s_partition_type == UDF_METADATA_MAP25) {
1309                 ret = udf_load_metadata_files(sb, i);
1310                 if (ret) {
1311                         printk(KERN_ERR "UDF-fs: error loading MetaData "
1312                         "partition map %d\n", i);
1313                         goto out_bh;
1314                 }
1315         } else {
1316                 ret = udf_load_vat(sb, i, type1_idx);
1317                 if (ret)
1318                         goto out_bh;
1319                 /*
1320                  * Mark filesystem read-only if we have a partition with
1321                  * virtual map since we don't handle writing to it (we
1322                  * overwrite blocks instead of relocating them).
1323                  */
1324                 sb->s_flags |= MS_RDONLY;
1325                 printk(KERN_NOTICE "UDF-fs: Filesystem marked read-only "
1326                         "because writing to pseudooverwrite partition is "
1327                         "not implemented.\n");
1328         }
1329 out_bh:
1330         /* In case loading failed, we handle cleanup in udf_fill_super */
1331         brelse(bh);
1332         return ret;
1333 }
1334
1335 static int udf_load_logicalvol(struct super_block *sb, sector_t block,
1336                                kernel_lb_addr *fileset)
1337 {
1338         struct logicalVolDesc *lvd;
1339         int i, j, offset;
1340         uint8_t type;
1341         struct udf_sb_info *sbi = UDF_SB(sb);
1342         struct genericPartitionMap *gpm;
1343         uint16_t ident;
1344         struct buffer_head *bh;
1345         int ret = 0;
1346
1347         bh = udf_read_tagged(sb, block, block, &ident);
1348         if (!bh)
1349                 return 1;
1350         BUG_ON(ident != TAG_IDENT_LVD);
1351         lvd = (struct logicalVolDesc *)bh->b_data;
1352
1353         i = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1354         if (i != 0) {
1355                 ret = i;
1356                 goto out_bh;
1357         }
1358
1359         for (i = 0, offset = 0;
1360              i < sbi->s_partitions && offset < le32_to_cpu(lvd->mapTableLength);
1361              i++, offset += gpm->partitionMapLength) {
1362                 struct udf_part_map *map = &sbi->s_partmaps[i];
1363                 gpm = (struct genericPartitionMap *)
1364                                 &(lvd->partitionMaps[offset]);
1365                 type = gpm->partitionMapType;
1366                 if (type == 1) {
1367                         struct genericPartitionMap1 *gpm1 =
1368                                 (struct genericPartitionMap1 *)gpm;
1369                         map->s_partition_type = UDF_TYPE1_MAP15;
1370                         map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1371                         map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1372                         map->s_partition_func = NULL;
1373                 } else if (type == 2) {
1374                         struct udfPartitionMap2 *upm2 =
1375                                                 (struct udfPartitionMap2 *)gpm;
1376                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1377                                                 strlen(UDF_ID_VIRTUAL))) {
1378                                 u16 suf =
1379                                         le16_to_cpu(((__le16 *)upm2->partIdent.
1380                                                         identSuffix)[0]);
1381                                 if (suf < 0x0200) {
1382                                         map->s_partition_type =
1383                                                         UDF_VIRTUAL_MAP15;
1384                                         map->s_partition_func =
1385                                                         udf_get_pblock_virt15;
1386                                 } else {
1387                                         map->s_partition_type =
1388                                                         UDF_VIRTUAL_MAP20;
1389                                         map->s_partition_func =
1390                                                         udf_get_pblock_virt20;
1391                                 }
1392                         } else if (!strncmp(upm2->partIdent.ident,
1393                                                 UDF_ID_SPARABLE,
1394                                                 strlen(UDF_ID_SPARABLE))) {
1395                                 uint32_t loc;
1396                                 struct sparingTable *st;
1397                                 struct sparablePartitionMap *spm =
1398                                         (struct sparablePartitionMap *)gpm;
1399
1400                                 map->s_partition_type = UDF_SPARABLE_MAP15;
1401                                 map->s_type_specific.s_sparing.s_packet_len =
1402                                                 le16_to_cpu(spm->packetLength);
1403                                 for (j = 0; j < spm->numSparingTables; j++) {
1404                                         struct buffer_head *bh2;
1405
1406                                         loc = le32_to_cpu(
1407                                                 spm->locSparingTable[j]);
1408                                         bh2 = udf_read_tagged(sb, loc, loc,
1409                                                              &ident);
1410                                         map->s_type_specific.s_sparing.
1411                                                         s_spar_map[j] = bh2;
1412
1413                                         if (bh2 == NULL)
1414                                                 continue;
1415
1416                                         st = (struct sparingTable *)bh2->b_data;
1417                                         if (ident != 0 || strncmp(
1418                                                 st->sparingIdent.ident,
1419                                                 UDF_ID_SPARING,
1420                                                 strlen(UDF_ID_SPARING))) {
1421                                                 brelse(bh2);
1422                                                 map->s_type_specific.s_sparing.
1423                                                         s_spar_map[j] = NULL;
1424                                         }
1425                                 }
1426                                 map->s_partition_func = udf_get_pblock_spar15;
1427                         } else if (!strncmp(upm2->partIdent.ident,
1428                                                 UDF_ID_METADATA,
1429                                                 strlen(UDF_ID_METADATA))) {
1430                                 struct udf_meta_data *mdata =
1431                                         &map->s_type_specific.s_metadata;
1432                                 struct metadataPartitionMap *mdm =
1433                                                 (struct metadataPartitionMap *)
1434                                                 &(lvd->partitionMaps[offset]);
1435                                 udf_debug("Parsing Logical vol part %d "
1436                                         "type %d  id=%s\n", i, type,
1437                                         UDF_ID_METADATA);
1438
1439                                 map->s_partition_type = UDF_METADATA_MAP25;
1440                                 map->s_partition_func = udf_get_pblock_meta25;
1441
1442                                 mdata->s_meta_file_loc   =
1443                                         le32_to_cpu(mdm->metadataFileLoc);
1444                                 mdata->s_mirror_file_loc =
1445                                         le32_to_cpu(mdm->metadataMirrorFileLoc);
1446                                 mdata->s_bitmap_file_loc =
1447                                         le32_to_cpu(mdm->metadataBitmapFileLoc);
1448                                 mdata->s_alloc_unit_size =
1449                                         le32_to_cpu(mdm->allocUnitSize);
1450                                 mdata->s_align_unit_size =
1451                                         le16_to_cpu(mdm->alignUnitSize);
1452                                 mdata->s_dup_md_flag     =
1453                                         mdm->flags & 0x01;
1454
1455                                 udf_debug("Metadata Ident suffix=0x%x\n",
1456                                         (le16_to_cpu(
1457                                          ((__le16 *)
1458                                               mdm->partIdent.identSuffix)[0])));
1459                                 udf_debug("Metadata part num=%d\n",
1460                                         le16_to_cpu(mdm->partitionNum));
1461                                 udf_debug("Metadata part alloc unit size=%d\n",
1462                                         le32_to_cpu(mdm->allocUnitSize));
1463                                 udf_debug("Metadata file loc=%d\n",
1464                                         le32_to_cpu(mdm->metadataFileLoc));
1465                                 udf_debug("Mirror file loc=%d\n",
1466                                        le32_to_cpu(mdm->metadataMirrorFileLoc));
1467                                 udf_debug("Bitmap file loc=%d\n",
1468                                        le32_to_cpu(mdm->metadataBitmapFileLoc));
1469                                 udf_debug("Duplicate Flag: %d %d\n",
1470                                         mdata->s_dup_md_flag, mdm->flags);
1471                         } else {
1472                                 udf_debug("Unknown ident: %s\n",
1473                                           upm2->partIdent.ident);
1474                                 continue;
1475                         }
1476                         map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1477                         map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1478                 }
1479                 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1480                           i, map->s_partition_num, type,
1481                           map->s_volumeseqnum);
1482         }
1483
1484         if (fileset) {
1485                 long_ad *la = (long_ad *)&(lvd->logicalVolContentsUse[0]);
1486
1487                 *fileset = lelb_to_cpu(la->extLocation);
1488                 udf_debug("FileSet found in LogicalVolDesc at block=%d, "
1489                           "partition=%d\n", fileset->logicalBlockNum,
1490                           fileset->partitionReferenceNum);
1491         }
1492         if (lvd->integritySeqExt.extLength)
1493                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1494
1495 out_bh:
1496         brelse(bh);
1497         return ret;
1498 }
1499
1500 /*
1501  * udf_load_logicalvolint
1502  *
1503  */
1504 static void udf_load_logicalvolint(struct super_block *sb, kernel_extent_ad loc)
1505 {
1506         struct buffer_head *bh = NULL;
1507         uint16_t ident;
1508         struct udf_sb_info *sbi = UDF_SB(sb);
1509         struct logicalVolIntegrityDesc *lvid;
1510
1511         while (loc.extLength > 0 &&
1512                (bh = udf_read_tagged(sb, loc.extLocation,
1513                                      loc.extLocation, &ident)) &&
1514                ident == TAG_IDENT_LVID) {
1515                 sbi->s_lvid_bh = bh;
1516                 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1517
1518                 if (lvid->nextIntegrityExt.extLength)
1519                         udf_load_logicalvolint(sb,
1520                                 leea_to_cpu(lvid->nextIntegrityExt));
1521
1522                 if (sbi->s_lvid_bh != bh)
1523                         brelse(bh);
1524                 loc.extLength -= sb->s_blocksize;
1525                 loc.extLocation++;
1526         }
1527         if (sbi->s_lvid_bh != bh)
1528                 brelse(bh);
1529 }
1530
1531 /*
1532  * udf_process_sequence
1533  *
1534  * PURPOSE
1535  *      Process a main/reserve volume descriptor sequence.
1536  *
1537  * PRE-CONDITIONS
1538  *      sb                      Pointer to _locked_ superblock.
1539  *      block                   First block of first extent of the sequence.
1540  *      lastblock               Lastblock of first extent of the sequence.
1541  *
1542  * HISTORY
1543  *      July 1, 1997 - Andrew E. Mileski
1544  *      Written, tested, and released.
1545  */
1546 static noinline int udf_process_sequence(struct super_block *sb, long block,
1547                                 long lastblock, kernel_lb_addr *fileset)
1548 {
1549         struct buffer_head *bh = NULL;
1550         struct udf_vds_record vds[VDS_POS_LENGTH];
1551         struct udf_vds_record *curr;
1552         struct generic_desc *gd;
1553         struct volDescPtr *vdp;
1554         int done = 0;
1555         uint32_t vdsn;
1556         uint16_t ident;
1557         long next_s = 0, next_e = 0;
1558
1559         memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1560
1561         /*
1562          * Read the main descriptor sequence and find which descriptors
1563          * are in it.
1564          */
1565         for (; (!done && block <= lastblock); block++) {
1566
1567                 bh = udf_read_tagged(sb, block, block, &ident);
1568                 if (!bh) {
1569                         printk(KERN_ERR "udf: Block %Lu of volume descriptor "
1570                                "sequence is corrupted or we could not read "
1571                                "it.\n", (unsigned long long)block);
1572                         return 1;
1573                 }
1574
1575                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1576                 gd = (struct generic_desc *)bh->b_data;
1577                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1578                 switch (ident) {
1579                 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1580                         curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1581                         if (vdsn >= curr->volDescSeqNum) {
1582                                 curr->volDescSeqNum = vdsn;
1583                                 curr->block = block;
1584                         }
1585                         break;
1586                 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1587                         curr = &vds[VDS_POS_VOL_DESC_PTR];
1588                         if (vdsn >= curr->volDescSeqNum) {
1589                                 curr->volDescSeqNum = vdsn;
1590                                 curr->block = block;
1591
1592                                 vdp = (struct volDescPtr *)bh->b_data;
1593                                 next_s = le32_to_cpu(
1594                                         vdp->nextVolDescSeqExt.extLocation);
1595                                 next_e = le32_to_cpu(
1596                                         vdp->nextVolDescSeqExt.extLength);
1597                                 next_e = next_e >> sb->s_blocksize_bits;
1598                                 next_e += next_s;
1599                         }
1600                         break;
1601                 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1602                         curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1603                         if (vdsn >= curr->volDescSeqNum) {
1604                                 curr->volDescSeqNum = vdsn;
1605                                 curr->block = block;
1606                         }
1607                         break;
1608                 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1609                         curr = &vds[VDS_POS_PARTITION_DESC];
1610                         if (!curr->block)
1611                                 curr->block = block;
1612                         break;
1613                 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1614                         curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1615                         if (vdsn >= curr->volDescSeqNum) {
1616                                 curr->volDescSeqNum = vdsn;
1617                                 curr->block = block;
1618                         }
1619                         break;
1620                 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1621                         curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1622                         if (vdsn >= curr->volDescSeqNum) {
1623                                 curr->volDescSeqNum = vdsn;
1624                                 curr->block = block;
1625                         }
1626                         break;
1627                 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1628                         vds[VDS_POS_TERMINATING_DESC].block = block;
1629                         if (next_e) {
1630                                 block = next_s;
1631                                 lastblock = next_e;
1632                                 next_s = next_e = 0;
1633                         } else
1634                                 done = 1;
1635                         break;
1636                 }
1637                 brelse(bh);
1638         }
1639         /*
1640          * Now read interesting descriptors again and process them
1641          * in a suitable order
1642          */
1643         if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1644                 printk(KERN_ERR "udf: Primary Volume Descriptor not found!\n");
1645                 return 1;
1646         }
1647         if (udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block))
1648                 return 1;
1649
1650         if (vds[VDS_POS_LOGICAL_VOL_DESC].block && udf_load_logicalvol(sb,
1651             vds[VDS_POS_LOGICAL_VOL_DESC].block, fileset))
1652                 return 1;
1653
1654         if (vds[VDS_POS_PARTITION_DESC].block) {
1655                 /*
1656                  * We rescan the whole descriptor sequence to find
1657                  * partition descriptor blocks and process them.
1658                  */
1659                 for (block = vds[VDS_POS_PARTITION_DESC].block;
1660                      block < vds[VDS_POS_TERMINATING_DESC].block;
1661                      block++)
1662                         if (udf_load_partdesc(sb, block))
1663                                 return 1;
1664         }
1665
1666         return 0;
1667 }
1668
1669 /*
1670  * udf_check_valid()
1671  */
1672 static int udf_check_valid(struct super_block *sb, int novrs, int silent)
1673 {
1674         long block;
1675         struct udf_sb_info *sbi = UDF_SB(sb);
1676
1677         if (novrs) {
1678                 udf_debug("Validity check skipped because of novrs option\n");
1679                 return 0;
1680         }
1681         /* Check that it is NSR02 compliant */
1682         /* Process any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
1683         block = udf_vrs(sb, silent);
1684         if (block == -1)
1685                 udf_debug("Failed to read byte 32768. Assuming open "
1686                           "disc. Skipping validity check\n");
1687         if (block && !sbi->s_last_block)
1688                 sbi->s_last_block = udf_get_last_block(sb);
1689         return !block;
1690 }
1691
1692 static int udf_load_sequence(struct super_block *sb, kernel_lb_addr *fileset)
1693 {
1694         struct anchorVolDescPtr *anchor;
1695         uint16_t ident;
1696         struct buffer_head *bh;
1697         long main_s, main_e, reserve_s, reserve_e;
1698         int i;
1699         struct udf_sb_info *sbi;
1700
1701         if (!sb)
1702                 return 1;
1703         sbi = UDF_SB(sb);
1704
1705         for (i = 0; i < ARRAY_SIZE(sbi->s_anchor); i++) {
1706                 if (!sbi->s_anchor[i])
1707                         continue;
1708
1709                 bh = udf_read_tagged(sb, sbi->s_anchor[i], sbi->s_anchor[i],
1710                                      &ident);
1711                 if (!bh)
1712                         continue;
1713
1714                 anchor = (struct anchorVolDescPtr *)bh->b_data;
1715
1716                 /* Locate the main sequence */
1717                 main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1718                 main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1719                 main_e = main_e >> sb->s_blocksize_bits;
1720                 main_e += main_s;
1721
1722                 /* Locate the reserve sequence */
1723                 reserve_s = le32_to_cpu(
1724                                 anchor->reserveVolDescSeqExt.extLocation);
1725                 reserve_e = le32_to_cpu(
1726                                 anchor->reserveVolDescSeqExt.extLength);
1727                 reserve_e = reserve_e >> sb->s_blocksize_bits;
1728                 reserve_e += reserve_s;
1729
1730                 brelse(bh);
1731
1732                 /* Process the main & reserve sequences */
1733                 /* responsible for finding the PartitionDesc(s) */
1734                 if (!(udf_process_sequence(sb, main_s, main_e,
1735                                            fileset) &&
1736                       udf_process_sequence(sb, reserve_s, reserve_e,
1737                                            fileset)))
1738                         break;
1739         }
1740
1741         if (i == ARRAY_SIZE(sbi->s_anchor)) {
1742                 udf_debug("No Anchor block found\n");
1743                 return 1;
1744         }
1745         udf_debug("Using anchor in block %d\n", sbi->s_anchor[i]);
1746
1747         return 0;
1748 }
1749
1750 static void udf_open_lvid(struct super_block *sb)
1751 {
1752         struct udf_sb_info *sbi = UDF_SB(sb);
1753         struct buffer_head *bh = sbi->s_lvid_bh;
1754         struct logicalVolIntegrityDesc *lvid;
1755         struct logicalVolIntegrityDescImpUse *lvidiu;
1756         if (!bh)
1757                 return;
1758
1759         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1760         lvidiu = udf_sb_lvidiu(sbi);
1761
1762         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1763         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1764         udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
1765                                 CURRENT_TIME);
1766         lvid->integrityType = LVID_INTEGRITY_TYPE_OPEN;
1767
1768         lvid->descTag.descCRC = cpu_to_le16(
1769                 crc_itu_t(0, (char *)lvid + sizeof(tag),
1770                         le16_to_cpu(lvid->descTag.descCRCLength)));
1771
1772         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1773         mark_buffer_dirty(bh);
1774 }
1775
1776 static void udf_close_lvid(struct super_block *sb)
1777 {
1778         struct udf_sb_info *sbi = UDF_SB(sb);
1779         struct buffer_head *bh = sbi->s_lvid_bh;
1780         struct logicalVolIntegrityDesc *lvid;
1781         struct logicalVolIntegrityDescImpUse *lvidiu;
1782
1783         if (!bh)
1784                 return;
1785
1786         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1787
1788         if (lvid->integrityType != LVID_INTEGRITY_TYPE_OPEN)
1789                 return;
1790
1791         lvidiu = udf_sb_lvidiu(sbi);
1792         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1793         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1794         udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
1795         if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1796                 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1797         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1798                 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1799         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
1800                 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
1801         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1802
1803         lvid->descTag.descCRC = cpu_to_le16(
1804                         crc_itu_t(0, (char *)lvid + sizeof(tag),
1805                                 le16_to_cpu(lvid->descTag.descCRCLength)));
1806
1807         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1808         mark_buffer_dirty(bh);
1809 }
1810
1811 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
1812 {
1813         int i;
1814         int nr_groups = bitmap->s_nr_groups;
1815         int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
1816                                                 nr_groups);
1817
1818         for (i = 0; i < nr_groups; i++)
1819                 if (bitmap->s_block_bitmap[i])
1820                         brelse(bitmap->s_block_bitmap[i]);
1821
1822         if (size <= PAGE_SIZE)
1823                 kfree(bitmap);
1824         else
1825                 vfree(bitmap);
1826 }
1827
1828 static void udf_free_partition(struct udf_part_map *map)
1829 {
1830         int i;
1831         struct udf_meta_data *mdata;
1832
1833         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1834                 iput(map->s_uspace.s_table);
1835         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1836                 iput(map->s_fspace.s_table);
1837         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1838                 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
1839         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1840                 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
1841         if (map->s_partition_type == UDF_SPARABLE_MAP15)
1842                 for (i = 0; i < 4; i++)
1843                         brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
1844         else if (map->s_partition_type == UDF_METADATA_MAP25) {
1845                 mdata = &map->s_type_specific.s_metadata;
1846                 iput(mdata->s_metadata_fe);
1847                 mdata->s_metadata_fe = NULL;
1848
1849                 iput(mdata->s_mirror_fe);
1850                 mdata->s_mirror_fe = NULL;
1851
1852                 iput(mdata->s_bitmap_fe);
1853                 mdata->s_bitmap_fe = NULL;
1854         }
1855 }
1856
1857 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1858 {
1859         int i;
1860         struct inode *inode = NULL;
1861         struct udf_options uopt;
1862         kernel_lb_addr rootdir, fileset;
1863         struct udf_sb_info *sbi;
1864
1865         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1866         uopt.uid = -1;
1867         uopt.gid = -1;
1868         uopt.umask = 0;
1869
1870         sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1871         if (!sbi)
1872                 return -ENOMEM;
1873
1874         sb->s_fs_info = sbi;
1875
1876         mutex_init(&sbi->s_alloc_mutex);
1877
1878         if (!udf_parse_options((char *)options, &uopt, false))
1879                 goto error_out;
1880
1881         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1882             uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
1883                 udf_error(sb, "udf_read_super",
1884                           "utf8 cannot be combined with iocharset\n");
1885                 goto error_out;
1886         }
1887 #ifdef CONFIG_UDF_NLS
1888         if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1889                 uopt.nls_map = load_nls_default();
1890                 if (!uopt.nls_map)
1891                         uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1892                 else
1893                         udf_debug("Using default NLS map\n");
1894         }
1895 #endif
1896         if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1897                 uopt.flags |= (1 << UDF_FLAG_UTF8);
1898
1899         fileset.logicalBlockNum = 0xFFFFFFFF;
1900         fileset.partitionReferenceNum = 0xFFFF;
1901
1902         sbi->s_flags = uopt.flags;
1903         sbi->s_uid = uopt.uid;
1904         sbi->s_gid = uopt.gid;
1905         sbi->s_umask = uopt.umask;
1906         sbi->s_nls_map = uopt.nls_map;
1907
1908         /* Set the block size for all transfers */
1909         if (!sb_min_blocksize(sb, uopt.blocksize)) {
1910                 udf_debug("Bad block size (%d)\n", uopt.blocksize);
1911                 printk(KERN_ERR "udf: bad block size (%d)\n", uopt.blocksize);
1912                 goto error_out;
1913         }
1914
1915         if (uopt.session == 0xFFFFFFFF)
1916                 sbi->s_session = udf_get_last_session(sb);
1917         else
1918                 sbi->s_session = uopt.session;
1919
1920         udf_debug("Multi-session=%d\n", sbi->s_session);
1921
1922         sbi->s_last_block = uopt.lastblock;
1923         sbi->s_anchor[0] = sbi->s_anchor[1] = 0;
1924         sbi->s_anchor[2] = uopt.anchor;
1925
1926         if (udf_check_valid(sb, uopt.novrs, silent)) {
1927                 /* read volume recognition sequences */
1928                 printk(KERN_WARNING "UDF-fs: No VRS found\n");
1929                 goto error_out;
1930         }
1931
1932         udf_find_anchor(sb);
1933
1934         /* Fill in the rest of the superblock */
1935         sb->s_op = &udf_sb_ops;
1936         sb->dq_op = NULL;
1937         sb->s_dirt = 0;
1938         sb->s_magic = UDF_SUPER_MAGIC;
1939         sb->s_time_gran = 1000;
1940
1941         if (udf_load_sequence(sb, &fileset)) {
1942                 printk(KERN_WARNING "UDF-fs: No partition found (1)\n");
1943                 goto error_out;
1944         }
1945
1946         udf_debug("Lastblock=%d\n", sbi->s_last_block);
1947
1948         if (sbi->s_lvid_bh) {
1949                 struct logicalVolIntegrityDescImpUse *lvidiu =
1950                                                         udf_sb_lvidiu(sbi);
1951                 uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
1952                 uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
1953                 /* uint16_t maxUDFWriteRev =
1954                                 le16_to_cpu(lvidiu->maxUDFWriteRev); */
1955
1956                 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
1957                         printk(KERN_ERR "UDF-fs: minUDFReadRev=%x "
1958                                         "(max is %x)\n",
1959                                le16_to_cpu(lvidiu->minUDFReadRev),
1960                                UDF_MAX_READ_VERSION);
1961                         goto error_out;
1962                 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
1963                         sb->s_flags |= MS_RDONLY;
1964
1965                 sbi->s_udfrev = minUDFWriteRev;
1966
1967                 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1968                         UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
1969                 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
1970                         UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
1971         }
1972
1973         if (!sbi->s_partitions) {
1974                 printk(KERN_WARNING "UDF-fs: No partition found (2)\n");
1975                 goto error_out;
1976         }
1977
1978         if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
1979                         UDF_PART_FLAG_READ_ONLY) {
1980                 printk(KERN_NOTICE "UDF-fs: Partition marked readonly; "
1981                                    "forcing readonly mount\n");
1982                 sb->s_flags |= MS_RDONLY;
1983         }
1984
1985         if (udf_find_fileset(sb, &fileset, &rootdir)) {
1986                 printk(KERN_WARNING "UDF-fs: No fileset found\n");
1987                 goto error_out;
1988         }
1989
1990         if (!silent) {
1991                 timestamp ts;
1992                 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
1993                 udf_info("UDF: Mounting volume '%s', "
1994                          "timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
1995                          sbi->s_volume_ident, le16_to_cpu(ts.year), ts.month, ts.day,
1996                          ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
1997         }
1998         if (!(sb->s_flags & MS_RDONLY))
1999                 udf_open_lvid(sb);
2000
2001         /* Assign the root inode */
2002         /* assign inodes by physical block number */
2003         /* perhaps it's not extensible enough, but for now ... */
2004         inode = udf_iget(sb, rootdir);
2005         if (!inode) {
2006                 printk(KERN_ERR "UDF-fs: Error in udf_iget, block=%d, "
2007                                 "partition=%d\n",
2008                        rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
2009                 goto error_out;
2010         }
2011
2012         /* Allocate a dentry for the root inode */
2013         sb->s_root = d_alloc_root(inode);
2014         if (!sb->s_root) {
2015                 printk(KERN_ERR "UDF-fs: Couldn't allocate root dentry\n");
2016                 iput(inode);
2017                 goto error_out;
2018         }
2019         sb->s_maxbytes = MAX_LFS_FILESIZE;
2020         return 0;
2021
2022 error_out:
2023         if (sbi->s_vat_inode)
2024                 iput(sbi->s_vat_inode);
2025         if (sbi->s_partitions)
2026                 for (i = 0; i < sbi->s_partitions; i++)
2027                         udf_free_partition(&sbi->s_partmaps[i]);
2028 #ifdef CONFIG_UDF_NLS
2029         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2030                 unload_nls(sbi->s_nls_map);
2031 #endif
2032         if (!(sb->s_flags & MS_RDONLY))
2033                 udf_close_lvid(sb);
2034         brelse(sbi->s_lvid_bh);
2035
2036         kfree(sbi->s_partmaps);
2037         kfree(sbi);
2038         sb->s_fs_info = NULL;
2039
2040         return -EINVAL;
2041 }
2042
2043 static void udf_error(struct super_block *sb, const char *function,
2044                       const char *fmt, ...)
2045 {
2046         va_list args;
2047
2048         if (!(sb->s_flags & MS_RDONLY)) {
2049                 /* mark sb error */
2050                 sb->s_dirt = 1;
2051         }
2052         va_start(args, fmt);
2053         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2054         va_end(args);
2055         printk(KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
2056                 sb->s_id, function, error_buf);
2057 }
2058
2059 void udf_warning(struct super_block *sb, const char *function,
2060                  const char *fmt, ...)
2061 {
2062         va_list args;
2063
2064         va_start(args, fmt);
2065         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2066         va_end(args);
2067         printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
2068                sb->s_id, function, error_buf);
2069 }
2070
2071 static void udf_put_super(struct super_block *sb)
2072 {
2073         int i;
2074         struct udf_sb_info *sbi;
2075
2076         sbi = UDF_SB(sb);
2077         if (sbi->s_vat_inode)
2078                 iput(sbi->s_vat_inode);
2079         if (sbi->s_partitions)
2080                 for (i = 0; i < sbi->s_partitions; i++)
2081                         udf_free_partition(&sbi->s_partmaps[i]);
2082 #ifdef CONFIG_UDF_NLS
2083         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2084                 unload_nls(sbi->s_nls_map);
2085 #endif
2086         if (!(sb->s_flags & MS_RDONLY))
2087                 udf_close_lvid(sb);
2088         brelse(sbi->s_lvid_bh);
2089         kfree(sbi->s_partmaps);
2090         kfree(sb->s_fs_info);
2091         sb->s_fs_info = NULL;
2092 }
2093
2094 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
2095 {
2096         struct super_block *sb = dentry->d_sb;
2097         struct udf_sb_info *sbi = UDF_SB(sb);
2098         struct logicalVolIntegrityDescImpUse *lvidiu;
2099
2100         if (sbi->s_lvid_bh != NULL)
2101                 lvidiu = udf_sb_lvidiu(sbi);
2102         else
2103                 lvidiu = NULL;
2104
2105         buf->f_type = UDF_SUPER_MAGIC;
2106         buf->f_bsize = sb->s_blocksize;
2107         buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
2108         buf->f_bfree = udf_count_free(sb);
2109         buf->f_bavail = buf->f_bfree;
2110         buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2111                                           le32_to_cpu(lvidiu->numDirs)) : 0)
2112                         + buf->f_bfree;
2113         buf->f_ffree = buf->f_bfree;
2114         /* __kernel_fsid_t f_fsid */
2115         buf->f_namelen = UDF_NAME_LEN - 2;
2116
2117         return 0;
2118 }
2119
2120 static unsigned int udf_count_free_bitmap(struct super_block *sb,
2121                                           struct udf_bitmap *bitmap)
2122 {
2123         struct buffer_head *bh = NULL;
2124         unsigned int accum = 0;
2125         int index;
2126         int block = 0, newblock;
2127         kernel_lb_addr loc;
2128         uint32_t bytes;
2129         uint8_t *ptr;
2130         uint16_t ident;
2131         struct spaceBitmapDesc *bm;
2132
2133         lock_kernel();
2134
2135         loc.logicalBlockNum = bitmap->s_extPosition;
2136         loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
2137         bh = udf_read_ptagged(sb, loc, 0, &ident);
2138
2139         if (!bh) {
2140                 printk(KERN_ERR "udf: udf_count_free failed\n");
2141                 goto out;
2142         } else if (ident != TAG_IDENT_SBD) {
2143                 brelse(bh);
2144                 printk(KERN_ERR "udf: udf_count_free failed\n");
2145                 goto out;
2146         }
2147
2148         bm = (struct spaceBitmapDesc *)bh->b_data;
2149         bytes = le32_to_cpu(bm->numOfBytes);
2150         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2151         ptr = (uint8_t *)bh->b_data;
2152
2153         while (bytes > 0) {
2154                 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2155                 accum += bitmap_weight((const unsigned long *)(ptr + index),
2156                                         cur_bytes * 8);
2157                 bytes -= cur_bytes;
2158                 if (bytes) {
2159                         brelse(bh);
2160                         newblock = udf_get_lb_pblock(sb, loc, ++block);
2161                         bh = udf_tread(sb, newblock);
2162                         if (!bh) {
2163                                 udf_debug("read failed\n");
2164                                 goto out;
2165                         }
2166                         index = 0;
2167                         ptr = (uint8_t *)bh->b_data;
2168                 }
2169         }
2170         brelse(bh);
2171
2172 out:
2173         unlock_kernel();
2174
2175         return accum;
2176 }
2177
2178 static unsigned int udf_count_free_table(struct super_block *sb,
2179                                          struct inode *table)
2180 {
2181         unsigned int accum = 0;
2182         uint32_t elen;
2183         kernel_lb_addr eloc;
2184         int8_t etype;
2185         struct extent_position epos;
2186
2187         lock_kernel();
2188
2189         epos.block = UDF_I(table)->i_location;
2190         epos.offset = sizeof(struct unallocSpaceEntry);
2191         epos.bh = NULL;
2192
2193         while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2194                 accum += (elen >> table->i_sb->s_blocksize_bits);
2195
2196         brelse(epos.bh);
2197
2198         unlock_kernel();
2199
2200         return accum;
2201 }
2202
2203 static unsigned int udf_count_free(struct super_block *sb)
2204 {
2205         unsigned int accum = 0;
2206         struct udf_sb_info *sbi;
2207         struct udf_part_map *map;
2208
2209         sbi = UDF_SB(sb);
2210         if (sbi->s_lvid_bh) {
2211                 struct logicalVolIntegrityDesc *lvid =
2212                         (struct logicalVolIntegrityDesc *)
2213                         sbi->s_lvid_bh->b_data;
2214                 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
2215                         accum = le32_to_cpu(
2216                                         lvid->freeSpaceTable[sbi->s_partition]);
2217                         if (accum == 0xFFFFFFFF)
2218                                 accum = 0;
2219                 }
2220         }
2221
2222         if (accum)
2223                 return accum;
2224
2225         map = &sbi->s_partmaps[sbi->s_partition];
2226         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2227                 accum += udf_count_free_bitmap(sb,
2228                                                map->s_uspace.s_bitmap);
2229         }
2230         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
2231                 accum += udf_count_free_bitmap(sb,
2232                                                map->s_fspace.s_bitmap);
2233         }
2234         if (accum)
2235                 return accum;
2236
2237         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2238                 accum += udf_count_free_table(sb,
2239                                               map->s_uspace.s_table);
2240         }
2241         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
2242                 accum += udf_count_free_table(sb,
2243                                               map->s_fspace.s_table);
2244         }
2245
2246         return accum;
2247 }