fs/udf/super.c

   1 /*
   2  * super.c
   3  *
   4  * PURPOSE
   5  *  Super block routines for the OSTA-UDF(tm) filesystem.
   6  *
   7  * DESCRIPTION
   8  *  OSTA-UDF(tm) = Optical Storage Technology Association
   9  *  Universal Disk Format.
  10  *
  11  *  This code is based on version 2.00 of the UDF specification,
  12  *  and revision 3 of the ECMA 167 standard [equivalent to ISO 13346].
  13  *    http://www.osta.org/
  14  *    http://www.ecma.ch/
  15  *    http://www.iso.org/
  16  *
  17  * COPYRIGHT
  18  *  This file is distributed under the terms of the GNU General Public
  19  *  License (GPL). Copies of the GPL can be obtained from:
  20  *    ftp://prep.ai.mit.edu/pub/gnu/GPL
  21  *  Each contributing author retains all rights to their own work.
  22  *
  23  *  (C) 1998 Dave Boynton
  24  *  (C) 1998-2004 Ben Fennema
  25  *  (C) 2000 Stelias Computing Inc
  26  *
  27  * HISTORY
  28  *
  29  *  09/24/98 dgb  changed to allow compiling outside of kernel, and
  30  *                added some debugging.
  31  *  10/01/98 dgb  updated to allow (some) possibility of compiling w/2.0.34
  32  *  10/16/98      attempting some multi-session support
  33  *  10/17/98      added freespace count for "df"
  34  *  11/11/98 gr   added novrs option
  35  *  11/26/98 dgb  added fileset,anchor mount options
  36  *  12/06/98 blf  really hosed things royally. vat/sparing support. sequenced
  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 <asm/byteorder.h>
  59
  60 #include "udf_sb.h"
  61 #include "udf_i.h"
  62
  63 #include <linux/init.h>
  64 #include <asm/uaccess.h>
  65
  66 #define VDS_POS_PRIMARY_VOL_DESC        0
  67 #define VDS_POS_UNALLOC_SPACE_DESC      1
  68 #define VDS_POS_LOGICAL_VOL_DESC        2
  69 #define VDS_POS_PARTITION_DESC          3
  70 #define VDS_POS_IMP_USE_VOL_DESC        4
  71 #define VDS_POS_VOL_DESC_PTR            5
  72 #define VDS_POS_TERMINATING_DESC        6
  73 #define VDS_POS_LENGTH                  7
  74
  75 #define UDF_DEFAULT_BLOCKSIZE 2048
  76
  77 static char error_buf[1024];
  78
  79 /* These are the "meat" - everything else is stuffing */
  80 static int udf_fill_super(struct super_block *, void *, int);
  81 static void udf_put_super(struct super_block *);
  82 static void udf_write_super(struct super_block *);
  83 static int udf_remount_fs(struct super_block *, int *, char *);
  84 static int udf_check_valid(struct super_block *, int, int);
  85 static int udf_vrs(struct super_block *sb, int silent);
  86 static int udf_load_partition(struct super_block *, kernel_lb_addr *);
  87 static int udf_load_logicalvol(struct super_block *, struct buffer_head *,
  88                                kernel_lb_addr *);
  89 static void udf_load_logicalvolint(struct super_block *, kernel_extent_ad);
  90 static void udf_find_anchor(struct super_block *);
  91 static int udf_find_fileset(struct super_block *, kernel_lb_addr *,
  92                             kernel_lb_addr *);
  93 static void udf_load_pvoldesc(struct super_block *, struct buffer_head *);
  94 static void udf_load_fileset(struct super_block *, struct buffer_head *,
  95                              kernel_lb_addr *);
  96 static int udf_load_partdesc(struct super_block *, struct buffer_head *);
  97 static void udf_open_lvid(struct super_block *);
  98 static void udf_close_lvid(struct super_block *);
  99 static unsigned int udf_count_free(struct super_block *);
 100 static int udf_statfs(struct dentry *, struct kstatfs *);
 101 static int udf_show_options(struct seq_file *, struct vfsmount *);
 102
 103 struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct udf_sb_info *sbi)
 104 {
 105         struct logicalVolIntegrityDesc *lvid =
 106                 (struct logicalVolIntegrityDesc *)sbi->s_lvid_bh->b_data;
 107         __u32 number_of_partitions = le32_to_cpu(lvid->numOfPartitions);
 108         __u32 offset = number_of_partitions * 2 *
 109                                 sizeof(uint32_t)/sizeof(uint8_t);
 110         return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
 111 }
 112
 113 /* UDF filesystem type */
 114 static int udf_get_sb(struct file_system_type *fs_type,
 115                       int flags, const char *dev_name, void *data,
 116                       struct vfsmount *mnt)
 117 {
 118         return get_sb_bdev(fs_type, flags, dev_name, data, udf_fill_super, mnt);
 119 }
 120
 121 static struct file_system_type udf_fstype = {
 122         .owner          = THIS_MODULE,
 123         .name           = "udf",
 124         .get_sb         = udf_get_sb,
 125         .kill_sb        = kill_block_super,
 126         .fs_flags       = FS_REQUIRES_DEV,
 127 };
 128
 129 static struct kmem_cache *udf_inode_cachep;
 130
 131 static struct inode *udf_alloc_inode(struct super_block *sb)
 132 {
 133         struct udf_inode_info *ei;
 134         ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
 135         if (!ei)
 136                 return NULL;
 137
 138         ei->i_unique = 0;
 139         ei->i_lenExtents = 0;
 140         ei->i_next_alloc_block = 0;
 141         ei->i_next_alloc_goal = 0;
 142         ei->i_strat4096 = 0;
 143
 144         return &ei->vfs_inode;
 145 }
 146
 147 static void udf_destroy_inode(struct inode *inode)
 148 {
 149         kmem_cache_free(udf_inode_cachep, UDF_I(inode));
 150 }
 151
 152 static void init_once(struct kmem_cache *cachep, void *foo)
 153 {
 154         struct udf_inode_info *ei = (struct udf_inode_info *)foo;
 155
 156         ei->i_ext.i_data = NULL;
 157         inode_init_once(&ei->vfs_inode);
 158 }
 159
 160 static int init_inodecache(void)
 161 {
 162         udf_inode_cachep = kmem_cache_create("udf_inode_cache",
 163                                              sizeof(struct udf_inode_info),
 164                                              0, (SLAB_RECLAIM_ACCOUNT |
 165                                                  SLAB_MEM_SPREAD),
 166                                              init_once);
 167         if (!udf_inode_cachep)
 168                 return -ENOMEM;
 169         return 0;
 170 }
 171
 172 static void destroy_inodecache(void)
 173 {
 174         kmem_cache_destroy(udf_inode_cachep);
 175 }
 176
 177 /* Superblock operations */
 178 static const struct super_operations udf_sb_ops = {
 179         .alloc_inode    = udf_alloc_inode,
 180         .destroy_inode  = udf_destroy_inode,
 181         .write_inode    = udf_write_inode,
 182         .delete_inode   = udf_delete_inode,
 183         .clear_inode    = udf_clear_inode,
 184         .put_super      = udf_put_super,
 185         .write_super    = udf_write_super,
 186         .statfs         = udf_statfs,
 187         .remount_fs     = udf_remount_fs,
 188         .show_options   = udf_show_options,
 189 };
 190
 191 struct udf_options {
 192         unsigned char novrs;
 193         unsigned int blocksize;
 194         unsigned int session;
 195         unsigned int lastblock;
 196         unsigned int anchor;
 197         unsigned int volume;
 198         unsigned short partition;
 199         unsigned int fileset;
 200         unsigned int rootdir;
 201         unsigned int flags;
 202         mode_t umask;
 203         gid_t gid;
 204         uid_t uid;
 205         struct nls_table *nls_map;
 206 };
 207
 208 static int __init init_udf_fs(void)
 209 {
 210         int err;
 211
 212         err = init_inodecache();
 213         if (err)
 214                 goto out1;
 215         err = register_filesystem(&udf_fstype);
 216         if (err)
 217                 goto out;
 218
 219         return 0;
 220
 221 out:
 222         destroy_inodecache();
 223
 224 out1:
 225         return err;
 226 }
 227
 228 static void __exit exit_udf_fs(void)
 229 {
 230         unregister_filesystem(&udf_fstype);
 231         destroy_inodecache();
 232 }
 233
 234 module_init(init_udf_fs)
 235 module_exit(exit_udf_fs)
 236
 237 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
 238 {
 239         struct udf_sb_info *sbi = UDF_SB(sb);
 240
 241         sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map),
 242                                   GFP_KERNEL);
 243         if (!sbi->s_partmaps) {
 244                 udf_error(sb, __FUNCTION__,
 245                           "Unable to allocate space for %d partition maps",
 246                           count);
 247                 sbi->s_partitions = 0;
 248                 return -ENOMEM;
 249         }
 250
 251         sbi->s_partitions = count;
 252         return 0;
 253 }
 254
 255 static int udf_show_options(struct seq_file *seq, struct vfsmount *mnt)
 256 {
 257         struct super_block *sb = mnt->mnt_sb;
 258         struct udf_sb_info *sbi = UDF_SB(sb);
 259
 260         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
 261                 seq_puts(seq, ",nostrict");
 262         if (sb->s_blocksize != UDF_DEFAULT_BLOCKSIZE)
 263                 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
 264         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
 265                 seq_puts(seq, ",unhide");
 266         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
 267                 seq_puts(seq, ",undelete");
 268         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
 269                 seq_puts(seq, ",noadinicb");
 270         if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
 271                 seq_puts(seq, ",shortad");
 272         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
 273                 seq_puts(seq, ",uid=forget");
 274         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_IGNORE))
 275                 seq_puts(seq, ",uid=ignore");
 276         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
 277                 seq_puts(seq, ",gid=forget");
 278         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE))
 279                 seq_puts(seq, ",gid=ignore");
 280         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
 281                 seq_printf(seq, ",uid=%u", sbi->s_uid);
 282         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
 283                 seq_printf(seq, ",gid=%u", sbi->s_gid);
 284         if (sbi->s_umask != 0)
 285                 seq_printf(seq, ",umask=%o", sbi->s_umask);
 286         if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
 287                 seq_printf(seq, ",session=%u", sbi->s_session);
 288         if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
 289                 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
 290         /*
 291          * s_anchor[2] could be zeroed out in case there is no anchor
 292          * in the specified block, but then the "anchor=N" option
 293          * originally given by the user wasn't effective, so it's OK
 294          * if we don't show it.
 295          */
 296         if (sbi->s_anchor[2] != 0)
 297                 seq_printf(seq, ",anchor=%u", sbi->s_anchor[2]);
 298         /*
 299          * volume, partition, fileset and rootdir seem to be ignored
 300          * currently
 301          */
 302         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
 303                 seq_puts(seq, ",utf8");
 304         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
 305                 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
 306
 307         return 0;
 308 }
 309
 310 /*
 311  * udf_parse_options
 312  *
 313  * PURPOSE
 314  *      Parse mount options.
 315  *
 316  * DESCRIPTION
 317  *      The following mount options are supported:
 318  *
 319  *      gid=            Set the default group.
 320  *      umask=          Set the default umask.
 321  *      uid=            Set the default user.
 322  *      bs=             Set the block size.
 323  *      unhide          Show otherwise hidden files.
 324  *      undelete        Show deleted files in lists.
 325  *      adinicb         Embed data in the inode (default)
 326  *      noadinicb       Don't embed data in the inode
 327  *      shortad         Use short ad's
 328  *      longad          Use long ad's (default)
 329  *      nostrict        Unset strict conformance
 330  *      iocharset=      Set the NLS character set
 331  *
 332  *      The remaining are for debugging and disaster recovery:
 333  *
 334  *      novrs           Skip volume sequence recognition
 335  *
 336  *      The following expect a offset from 0.
 337  *
 338  *      session=        Set the CDROM session (default= last session)
 339  *      anchor=         Override standard anchor location. (default= 256)
 340  *      volume=         Override the VolumeDesc location. (unused)
 341  *      partition=      Override the PartitionDesc location. (unused)
 342  *      lastblock=      Set the last block of the filesystem/
 343  *
 344  *      The following expect a offset from the partition root.
 345  *
 346  *      fileset=        Override the fileset block location. (unused)
 347  *      rootdir=        Override the root directory location. (unused)
 348  *              WARNING: overriding the rootdir to a non-directory may
 349  *              yield highly unpredictable results.
 350  *
 351  * PRE-CONDITIONS
 352  *      options         Pointer to mount options string.
 353  *      uopts           Pointer to mount options variable.
 354  *
 355  * POST-CONDITIONS
 356  *      <return>        1       Mount options parsed okay.
 357  *      <return>        0       Error parsing mount options.
 358  *
 359  * HISTORY
 360  *      July 1, 1997 - Andrew E. Mileski
 361  *      Written, tested, and released.
 362  */
 363
 364 enum {
 365         Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
 366         Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
 367         Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
 368         Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
 369         Opt_rootdir, Opt_utf8, Opt_iocharset,
 370         Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore
 371 };
 372
 373 static match_table_t tokens = {
 374         {Opt_novrs,     "novrs"},
 375         {Opt_nostrict,  "nostrict"},
 376         {Opt_bs,        "bs=%u"},
 377         {Opt_unhide,    "unhide"},
 378         {Opt_undelete,  "undelete"},
 379         {Opt_noadinicb, "noadinicb"},
 380         {Opt_adinicb,   "adinicb"},
 381         {Opt_shortad,   "shortad"},
 382         {Opt_longad,    "longad"},
 383         {Opt_uforget,   "uid=forget"},
 384         {Opt_uignore,   "uid=ignore"},
 385         {Opt_gforget,   "gid=forget"},
 386         {Opt_gignore,   "gid=ignore"},
 387         {Opt_gid,       "gid=%u"},
 388         {Opt_uid,       "uid=%u"},
 389         {Opt_umask,     "umask=%o"},
 390         {Opt_session,   "session=%u"},
 391         {Opt_lastblock, "lastblock=%u"},
 392         {Opt_anchor,    "anchor=%u"},
 393         {Opt_volume,    "volume=%u"},
 394         {Opt_partition, "partition=%u"},
 395         {Opt_fileset,   "fileset=%u"},
 396         {Opt_rootdir,   "rootdir=%u"},
 397         {Opt_utf8,      "utf8"},
 398         {Opt_iocharset, "iocharset=%s"},
 399         {Opt_err,       NULL}
 400 };
 401
 402 static int udf_parse_options(char *options, struct udf_options *uopt,
 403                              bool remount)
 404 {
 405         char *p;
 406         int option;
 407
 408         uopt->novrs = 0;
 409         uopt->blocksize = UDF_DEFAULT_BLOCKSIZE;
 410         uopt->partition = 0xFFFF;
 411         uopt->session = 0xFFFFFFFF;
 412         uopt->lastblock = 0;
 413         uopt->anchor = 0;
 414         uopt->volume = 0xFFFFFFFF;
 415         uopt->rootdir = 0xFFFFFFFF;
 416         uopt->fileset = 0xFFFFFFFF;
 417         uopt->nls_map = NULL;
 418
 419         if (!options)
 420                 return 1;
 421
 422         while ((p = strsep(&options, ",")) != NULL) {
 423                 substring_t args[MAX_OPT_ARGS];
 424                 int token;
 425                 if (!*p)
 426                         continue;
 427
 428                 token = match_token(p, tokens, args);
 429                 switch (token) {
 430                 case Opt_novrs:
 431                         uopt->novrs = 1;
 432                 case Opt_bs:
 433                         if (match_int(&args[0], &option))
 434                                 return 0;
 435                         uopt->blocksize = option;
 436                         break;
 437                 case Opt_unhide:
 438                         uopt->flags |= (1 << UDF_FLAG_UNHIDE);
 439                         break;
 440                 case Opt_undelete:
 441                         uopt->flags |= (1 << UDF_FLAG_UNDELETE);
 442                         break;
 443                 case Opt_noadinicb:
 444                         uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
 445                         break;
 446                 case Opt_adinicb:
 447                         uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
 448                         break;
 449                 case Opt_shortad:
 450                         uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
 451                         break;
 452                 case Opt_longad:
 453                         uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
 454                         break;
 455                 case Opt_gid:
 456                         if (match_int(args, &option))
 457                                 return 0;
 458                         uopt->gid = option;
 459                         uopt->flags |= (1 << UDF_FLAG_GID_SET);
 460                         break;
 461                 case Opt_uid:
 462                         if (match_int(args, &option))
 463                                 return 0;
 464                         uopt->uid = option;
 465                         uopt->flags |= (1 << UDF_FLAG_UID_SET);
 466                         break;
 467                 case Opt_umask:
 468                         if (match_octal(args, &option))
 469                                 return 0;
 470                         uopt->umask = option;
 471                         break;
 472                 case Opt_nostrict:
 473                         uopt->flags &= ~(1 << UDF_FLAG_STRICT);
 474                         break;
 475                 case Opt_session:
 476                         if (match_int(args, &option))
 477                                 return 0;
 478                         uopt->session = option;
 479                         if (!remount)
 480                                 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
 481                         break;
 482                 case Opt_lastblock:
 483                         if (match_int(args, &option))
 484                                 return 0;
 485                         uopt->lastblock = option;
 486                         if (!remount)
 487                                 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
 488                         break;
 489                 case Opt_anchor:
 490                         if (match_int(args, &option))
 491                                 return 0;
 492                         uopt->anchor = option;
 493                         break;
 494                 case Opt_volume:
 495                         if (match_int(args, &option))
 496                                 return 0;
 497                         uopt->volume = option;
 498                         break;
 499                 case Opt_partition:
 500                         if (match_int(args, &option))
 501                                 return 0;
 502                         uopt->partition = option;
 503                         break;
 504                 case Opt_fileset:
 505                         if (match_int(args, &option))
 506                                 return 0;
 507                         uopt->fileset = option;
 508                         break;
 509                 case Opt_rootdir:
 510                         if (match_int(args, &option))
 511                                 return 0;
 512                         uopt->rootdir = option;
 513                         break;
 514                 case Opt_utf8:
 515                         uopt->flags |= (1 << UDF_FLAG_UTF8);
 516                         break;
 517 #ifdef CONFIG_UDF_NLS
 518                 case Opt_iocharset:
 519                         uopt->nls_map = load_nls(args[0].from);
 520                         uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
 521                         break;
 522 #endif
 523                 case Opt_uignore:
 524                         uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
 525                         break;
 526                 case Opt_uforget:
 527                         uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
 528                         break;
 529                 case Opt_gignore:
 530                         uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
 531                         break;
 532                 case Opt_gforget:
 533                         uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
 534                         break;
 535                 default:
 536                         printk(KERN_ERR "udf: bad mount option \"%s\" "
 537                                "or missing value\n", p);
 538                         return 0;
 539                 }
 540         }
 541         return 1;
 542 }
 543
 544 static void udf_write_super(struct super_block *sb)
 545 {
 546         lock_kernel();
 547
 548         if (!(sb->s_flags & MS_RDONLY))
 549                 udf_open_lvid(sb);
 550         sb->s_dirt = 0;
 551
 552         unlock_kernel();
 553 }
 554
 555 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
 556 {
 557         struct udf_options uopt;
 558         struct udf_sb_info *sbi = UDF_SB(sb);
 559
 560         uopt.flags = sbi->s_flags;
 561         uopt.uid   = sbi->s_uid;
 562         uopt.gid   = sbi->s_gid;
 563         uopt.umask = sbi->s_umask;
 564
 565         if (!udf_parse_options(options, &uopt, true))
 566                 return -EINVAL;
 567
 568         sbi->s_flags = uopt.flags;
 569         sbi->s_uid   = uopt.uid;
 570         sbi->s_gid   = uopt.gid;
 571         sbi->s_umask = uopt.umask;
 572
 573         if (sbi->s_lvid_bh) {
 574                 int write_rev = le16_to_cpu(udf_sb_lvidiu(sbi)->minUDFWriteRev);
 575                 if (write_rev > UDF_MAX_WRITE_VERSION)
 576                         *flags |= MS_RDONLY;
 577         }
 578
 579         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 580                 return 0;
 581         if (*flags & MS_RDONLY)
 582                 udf_close_lvid(sb);
 583         else
 584                 udf_open_lvid(sb);
 585
 586         return 0;
 587 }
 588
 589 static int udf_vrs(struct super_block *sb, int silent)
 590 {
 591         struct volStructDesc *vsd = NULL;
 592         int sector = 32768;
 593         int sectorsize;
 594         struct buffer_head *bh = NULL;
 595         int iso9660 = 0;
 596         int nsr02 = 0;
 597         int nsr03 = 0;
 598         struct udf_sb_info *sbi;
 599
 600         /* Block size must be a multiple of 512 */
 601         if (sb->s_blocksize & 511)
 602                 return 0;
 603         sbi = UDF_SB(sb);
 604
 605         if (sb->s_blocksize < sizeof(struct volStructDesc))
 606                 sectorsize = sizeof(struct volStructDesc);
 607         else
 608                 sectorsize = sb->s_blocksize;
 609
 610         sector += (sbi->s_session << sb->s_blocksize_bits);
 611
 612         udf_debug("Starting at sector %u (%ld byte sectors)\n",
 613                   (sector >> sb->s_blocksize_bits), 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  * udf_find_anchor
 684  *
 685  * PURPOSE
 686  *      Find an anchor volume descriptor.
 687  *
 688  * PRE-CONDITIONS
 689  *      sb                      Pointer to _locked_ superblock.
 690  *      lastblock               Last block on media.
 691  *
 692  * POST-CONDITIONS
 693  *      <return>                1 if not found, 0 if ok
 694  *
 695  * HISTORY
 696  *      July 1, 1997 - Andrew E. Mileski
 697  *      Written, tested, and released.
 698  */
 699 static void udf_find_anchor(struct super_block *sb)
 700 {
 701         int lastblock;
 702         struct buffer_head *bh = NULL;
 703         uint16_t ident;
 704         uint32_t location;
 705         int i;
 706         struct udf_sb_info *sbi;
 707
 708         sbi = UDF_SB(sb);
 709         lastblock = sbi->s_last_block;
 710
 711         if (lastblock) {
 712                 int varlastblock = udf_variable_to_fixed(lastblock);
 713                 int last[] =  { lastblock, lastblock - 2,
 714                                 lastblock - 150, lastblock - 152,
 715                                 varlastblock, varlastblock - 2,
 716                                 varlastblock - 150, varlastblock - 152 };
 717
 718                 lastblock = 0;
 719
 720                 /* Search for an anchor volume descriptor pointer */
 721
 722                 /*  according to spec, anchor is in either:
 723                  *     block 256
 724                  *     lastblock-256
 725                  *     lastblock
 726                  *  however, if the disc isn't closed, it could be 512 */
 727
 728                 for (i = 0; !lastblock && i < ARRAY_SIZE(last); i++) {
 729                         ident = location = 0;
 730                         if (last[i] >= 0) {
 731                                 bh = sb_bread(sb, last[i]);
 732                                 if (bh) {
 733                                         tag *t = (tag *)bh->b_data;
 734                                         ident = le16_to_cpu(t->tagIdent);
 735                                         location = le32_to_cpu(t->tagLocation);
 736                                         brelse(bh);
 737                                 }
 738                         }
 739
 740                         if (ident == TAG_IDENT_AVDP) {
 741                                 if (location == last[i] - sbi->s_session) {
 742                                         lastblock = last[i] - sbi->s_session;
 743                                         sbi->s_anchor[0] = lastblock;
 744                                         sbi->s_anchor[1] = lastblock - 256;
 745                                 } else if (location ==
 746                                                 udf_variable_to_fixed(last[i]) -
 747                                                         sbi->s_session) {
 748                                         UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
 749                                         lastblock =
 750                                                 udf_variable_to_fixed(last[i]) -
 751                                                         sbi->s_session;
 752                                         sbi->s_anchor[0] = lastblock;
 753                                         sbi->s_anchor[1] = lastblock - 256 -
 754                                                                 sbi->s_session;
 755                                 } else {
 756                                         udf_debug("Anchor found at block %d, "
 757                                                   "location mismatch %d.\n",
 758                                                   last[i], location);
 759                                 }
 760                         } else if (ident == TAG_IDENT_FE ||
 761                                         ident == TAG_IDENT_EFE) {
 762                                 lastblock = last[i];
 763                                 sbi->s_anchor[3] = 512;
 764                         } else {
 765                                 ident = location = 0;
 766                                 if (last[i] >= 256) {
 767                                         bh = sb_bread(sb, last[i] - 256);
 768                                         if (bh) {
 769                                                 tag *t = (tag *)bh->b_data;
 770                                                 ident = le16_to_cpu(
 771                                                                 t->tagIdent);
 772                                                 location = le32_to_cpu(
 773                                                                 t->tagLocation);
 774                                                 brelse(bh);
 775                                         }
 776                                 }
 777
 778                                 if (ident == TAG_IDENT_AVDP &&
 779                                     location == last[i] - 256 -
 780                                                 sbi->s_session) {
 781                                         lastblock = last[i];
 782                                         sbi->s_anchor[1] = last[i] - 256;
 783                                 } else {
 784                                         ident = location = 0;
 785                                         if (last[i] >= 312 + sbi->s_session) {
 786                                                 bh = sb_bread(sb,
 787                                                                 last[i] - 312 -
 788                                                                 sbi->s_session);
 789                                                 if (bh) {
 790                                                         tag *t = (tag *)
 791                                                                  bh->b_data;
 792                                                         ident = le16_to_cpu(
 793                                                                 t->tagIdent);
 794                                                         location = le32_to_cpu(
 795                                                                 t->tagLocation);
 796                                                         brelse(bh);
 797                                                 }
 798                                         }
 799
 800                                         if (ident == TAG_IDENT_AVDP &&
 801                                             location == udf_variable_to_fixed(last[i]) - 256) {
 802                                                 UDF_SET_FLAG(sb,
 803                                                              UDF_FLAG_VARCONV);
 804                                                 lastblock = udf_variable_to_fixed(last[i]);
 805                                                 sbi->s_anchor[1] = lastblock - 256;
 806                                         }
 807                                 }
 808                         }
 809                 }
 810         }
 811
 812         if (!lastblock) {
 813                 /* We haven't found the lastblock. check 312 */
 814                 bh = sb_bread(sb, 312 + sbi->s_session);
 815                 if (bh) {
 816                         tag *t = (tag *)bh->b_data;
 817                         ident = le16_to_cpu(t->tagIdent);
 818                         location = le32_to_cpu(t->tagLocation);
 819                         brelse(bh);
 820
 821                         if (ident == TAG_IDENT_AVDP && location == 256)
 822                                 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
 823                 }
 824         }
 825
 826         for (i = 0; i < ARRAY_SIZE(sbi->s_anchor); i++) {
 827                 if (sbi->s_anchor[i]) {
 828                         bh = udf_read_tagged(sb, sbi->s_anchor[i],
 829                                              sbi->s_anchor[i], &ident);
 830                         if (!bh)
 831                                 sbi->s_anchor[i] = 0;
 832                         else {
 833                                 brelse(bh);
 834                                 if ((ident != TAG_IDENT_AVDP) &&
 835                                     (i || (ident != TAG_IDENT_FE &&
 836                                            ident != TAG_IDENT_EFE)))
 837                                         sbi->s_anchor[i] = 0;
 838                         }
 839                 }
 840         }
 841
 842         sbi->s_last_block = lastblock;
 843 }
 844
 845 static int udf_find_fileset(struct super_block *sb,
 846                             kernel_lb_addr *fileset,
 847                             kernel_lb_addr *root)
 848 {
 849         struct buffer_head *bh = NULL;
 850         long lastblock;
 851         uint16_t ident;
 852         struct udf_sb_info *sbi;
 853
 854         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
 855             fileset->partitionReferenceNum != 0xFFFF) {
 856                 bh = udf_read_ptagged(sb, *fileset, 0, &ident);
 857
 858                 if (!bh) {
 859                         return 1;
 860                 } else if (ident != TAG_IDENT_FSD) {
 861                         brelse(bh);
 862                         return 1;
 863                 }
 864
 865         }
 866
 867         sbi = UDF_SB(sb);
 868         if (!bh) {
 869                 /* Search backwards through the partitions */
 870                 kernel_lb_addr newfileset;
 871
 872 /* --> cvg: FIXME - is it reasonable? */
 873                 return 1;
 874
 875                 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
 876                      (newfileset.partitionReferenceNum != 0xFFFF &&
 877                       fileset->logicalBlockNum == 0xFFFFFFFF &&
 878                       fileset->partitionReferenceNum == 0xFFFF);
 879                      newfileset.partitionReferenceNum--) {
 880                         lastblock = sbi->s_partmaps
 881                                         [newfileset.partitionReferenceNum]
 882                                                 .s_partition_len;
 883                         newfileset.logicalBlockNum = 0;
 884
 885                         do {
 886                                 bh = udf_read_ptagged(sb, newfileset, 0,
 887                                                       &ident);
 888                                 if (!bh) {
 889                                         newfileset.logicalBlockNum++;
 890                                         continue;
 891                                 }
 892
 893                                 switch (ident) {
 894                                 case TAG_IDENT_SBD:
 895                                 {
 896                                         struct spaceBitmapDesc *sp;
 897                                         sp = (struct spaceBitmapDesc *)
 898                                                                 bh->b_data;
 899                                         newfileset.logicalBlockNum += 1 +
 900                                                 ((le32_to_cpu(sp->numOfBytes) +
 901                                                   sizeof(struct spaceBitmapDesc)
 902                                                   - 1) >> sb->s_blocksize_bits);
 903                                         brelse(bh);
 904                                         break;
 905                                 }
 906                                 case TAG_IDENT_FSD:
 907                                         *fileset = newfileset;
 908                                         break;
 909                                 default:
 910                                         newfileset.logicalBlockNum++;
 911                                         brelse(bh);
 912                                         bh = NULL;
 913                                         break;
 914                                 }
 915                         } while (newfileset.logicalBlockNum < lastblock &&
 916                                  fileset->logicalBlockNum == 0xFFFFFFFF &&
 917                                  fileset->partitionReferenceNum == 0xFFFF);
 918                 }
 919         }
 920
 921         if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
 922              fileset->partitionReferenceNum != 0xFFFF) && bh) {
 923                 udf_debug("Fileset at block=%d, partition=%d\n",
 924                           fileset->logicalBlockNum,
 925                           fileset->partitionReferenceNum);
 926
 927                 sbi->s_partition = fileset->partitionReferenceNum;
 928                 udf_load_fileset(sb, bh, root);
 929                 brelse(bh);
 930                 return 0;
 931         }
 932         return 1;
 933 }
 934
 935 static void udf_load_pvoldesc(struct super_block *sb, struct buffer_head *bh)
 936 {
 937         struct primaryVolDesc *pvoldesc;
 938         time_t recording;
 939         long recording_usec;
 940         struct ustr instr;
 941         struct ustr outstr;
 942
 943         pvoldesc = (struct primaryVolDesc *)bh->b_data;
 944
 945         if (udf_stamp_to_time(&recording, &recording_usec,
 946                               lets_to_cpu(pvoldesc->recordingDateAndTime))) {
 947                 kernel_timestamp ts;
 948                 ts = lets_to_cpu(pvoldesc->recordingDateAndTime);
 949                 udf_debug("recording time %ld/%ld, %04u/%02u/%02u"
 950                           " %02u:%02u (%x)\n",
 951                           recording, recording_usec,
 952                           ts.year, ts.month, ts.day, ts.hour,
 953                           ts.minute, ts.typeAndTimezone);
 954                 UDF_SB(sb)->s_record_time.tv_sec = recording;
 955                 UDF_SB(sb)->s_record_time.tv_nsec = recording_usec * 1000;
 956         }
 957
 958         if (!udf_build_ustr(&instr, pvoldesc->volIdent, 32))
 959                 if (udf_CS0toUTF8(&outstr, &instr)) {
 960                         strncpy(UDF_SB(sb)->s_volume_ident, outstr.u_name,
 961                                 outstr.u_len > 31 ? 31 : outstr.u_len);
 962                         udf_debug("volIdent[] = '%s'\n",
 963                                         UDF_SB(sb)->s_volume_ident);
 964                 }
 965
 966         if (!udf_build_ustr(&instr, pvoldesc->volSetIdent, 128))
 967                 if (udf_CS0toUTF8(&outstr, &instr))
 968                         udf_debug("volSetIdent[] = '%s'\n", outstr.u_name);
 969 }
 970
 971 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
 972                              kernel_lb_addr *root)
 973 {
 974         struct fileSetDesc *fset;
 975
 976         fset = (struct fileSetDesc *)bh->b_data;
 977
 978         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
 979
 980         UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
 981
 982         udf_debug("Rootdir at block=%d, partition=%d\n",
 983                   root->logicalBlockNum, root->partitionReferenceNum);
 984 }
 985
 986 int udf_compute_nr_groups(struct super_block *sb, u32 partition)
 987 {
 988         struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
 989         return (map->s_partition_len +
 990                 (sizeof(struct spaceBitmapDesc) << 3) +
 991                 (sb->s_blocksize * 8) - 1) /
 992                 (sb->s_blocksize * 8);
 993 }
 994
 995 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
 996 {
 997         struct udf_bitmap *bitmap;
 998         int nr_groups;
 999         int size;
1000
1001         nr_groups = udf_compute_nr_groups(sb, index);
1002         size = sizeof(struct udf_bitmap) +
1003                 (sizeof(struct buffer_head *) * nr_groups);
1004
1005         if (size <= PAGE_SIZE)
1006                 bitmap = kmalloc(size, GFP_KERNEL);
1007         else
1008                 bitmap = vmalloc(size); /* TODO: get rid of vmalloc */
1009
1010         if (bitmap == NULL) {
1011                 udf_error(sb, __FUNCTION__,
1012                           "Unable to allocate space for bitmap "
1013                           "and %d buffer_head pointers", nr_groups);
1014                 return NULL;
1015         }
1016
1017         memset(bitmap, 0x00, size);
1018         bitmap->s_block_bitmap = (struct buffer_head **)(bitmap + 1);
1019         bitmap->s_nr_groups = nr_groups;
1020         return bitmap;
1021 }
1022
1023 static int udf_load_partdesc(struct super_block *sb, struct buffer_head *bh)
1024 {
1025         struct partitionDesc *p;
1026         int i;
1027         struct udf_part_map *map;
1028         struct udf_sb_info *sbi;
1029
1030         p = (struct partitionDesc *)bh->b_data;
1031         sbi = UDF_SB(sb);
1032
1033         for (i = 0; i < sbi->s_partitions; i++) {
1034                 map = &sbi->s_partmaps[i];
1035                 udf_debug("Searching map: (%d == %d)\n",
1036                           map->s_partition_num,
1037                           le16_to_cpu(p->partitionNumber));
1038                 if (map->s_partition_num ==
1039                                 le16_to_cpu(p->partitionNumber)) {
1040                         map->s_partition_len =
1041                                 le32_to_cpu(p->partitionLength); /* blocks */
1042                         map->s_partition_root =
1043                                 le32_to_cpu(p->partitionStartingLocation);
1044                         if (p->accessType ==
1045                                         cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
1046                                 map->s_partition_flags |=
1047                                                 UDF_PART_FLAG_READ_ONLY;
1048                         if (p->accessType ==
1049                                         cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
1050                                 map->s_partition_flags |=
1051                                                 UDF_PART_FLAG_WRITE_ONCE;
1052                         if (p->accessType ==
1053                                         cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
1054                                 map->s_partition_flags |=
1055                                                 UDF_PART_FLAG_REWRITABLE;
1056                         if (p->accessType ==
1057                                     cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
1058                                 map->s_partition_flags |=
1059                                                 UDF_PART_FLAG_OVERWRITABLE;
1060
1061                         if (!strcmp(p->partitionContents.ident,
1062                                     PD_PARTITION_CONTENTS_NSR02) ||
1063                             !strcmp(p->partitionContents.ident,
1064                                     PD_PARTITION_CONTENTS_NSR03)) {
1065                                 struct partitionHeaderDesc *phd;
1066
1067                                 phd = (struct partitionHeaderDesc *)
1068                                                 (p->partitionContentsUse);
1069                                 if (phd->unallocSpaceTable.extLength) {
1070                                         kernel_lb_addr loc = {
1071                                                 .logicalBlockNum = le32_to_cpu(phd->unallocSpaceTable.extPosition),
1072                                                 .partitionReferenceNum = i,
1073                                         };
1074
1075                                         map->s_uspace.s_table =
1076                                                 udf_iget(sb, loc);
1077                                         if (!map->s_uspace.s_table) {
1078                                                 udf_debug("cannot load unallocSpaceTable (part %d)\n", i);
1079                                                 return 1;
1080                                         }
1081                                         map->s_partition_flags |=
1082                                                 UDF_PART_FLAG_UNALLOC_TABLE;
1083                                         udf_debug("unallocSpaceTable (part %d) @ %ld\n",
1084                                                   i, map->s_uspace.s_table->i_ino);
1085                                 }
1086                                 if (phd->unallocSpaceBitmap.extLength) {
1087                                         struct udf_bitmap *bitmap =
1088                                                 udf_sb_alloc_bitmap(sb, i);
1089                                         map->s_uspace.s_bitmap = bitmap;
1090                                         if (bitmap != NULL) {
1091                                                 bitmap->s_extLength =
1092                                                         le32_to_cpu(phd->unallocSpaceBitmap.extLength);
1093                                                 bitmap->s_extPosition =
1094                                                         le32_to_cpu(phd->unallocSpaceBitmap.extPosition);
1095                                                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1096                                                 udf_debug("unallocSpaceBitmap (part %d) @ %d\n",
1097                                                           i, bitmap->s_extPosition);
1098                                         }
1099                                 }
1100                                 if (phd->partitionIntegrityTable.extLength)
1101                                         udf_debug("partitionIntegrityTable (part %d)\n", i);
1102                                 if (phd->freedSpaceTable.extLength) {
1103                                         kernel_lb_addr loc = {
1104                                                 .logicalBlockNum = le32_to_cpu(phd->freedSpaceTable.extPosition),
1105                                                 .partitionReferenceNum = i,
1106                                         };
1107
1108                                         map->s_fspace.s_table =
1109                                                 udf_iget(sb, loc);
1110                                         if (!map->s_fspace.s_table) {
1111                                                 udf_debug("cannot load freedSpaceTable (part %d)\n", i);
1112                                                 return 1;
1113                                         }
1114                                         map->s_partition_flags |=
1115                                                 UDF_PART_FLAG_FREED_TABLE;
1116                                         udf_debug("freedSpaceTable (part %d) @ %ld\n",
1117                                                   i, map->s_fspace.s_table->i_ino);
1118                                 }
1119                                 if (phd->freedSpaceBitmap.extLength) {
1120                                         struct udf_bitmap *bitmap =
1121                                                 udf_sb_alloc_bitmap(sb, i);
1122                                         map->s_fspace.s_bitmap = bitmap;
1123                                         if (bitmap != NULL) {
1124                                                 bitmap->s_extLength =
1125                                                         le32_to_cpu(phd->freedSpaceBitmap.extLength);
1126                                                 bitmap->s_extPosition =
1127                                                         le32_to_cpu(phd->freedSpaceBitmap.extPosition);
1128                                                 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1129                                                 udf_debug("freedSpaceBitmap (part %d) @ %d\n",
1130                                                           i, bitmap->s_extPosition);
1131                                         }
1132                                 }
1133                         }
1134                         break;
1135                 }
1136         }
1137         if (i == sbi->s_partitions)
1138                 udf_debug("Partition (%d) not found in partition map\n",
1139                           le16_to_cpu(p->partitionNumber));
1140         else
1141                 udf_debug("Partition (%d:%d type %x) starts at physical %d, "
1142                           "block length %d\n",
1143                           le16_to_cpu(p->partitionNumber), i,
1144                           map->s_partition_type,
1145                           map->s_partition_root,
1146                           map->s_partition_len);
1147         return 0;
1148 }
1149
1150 static int udf_load_logicalvol(struct super_block *sb, struct buffer_head *bh,
1151                                kernel_lb_addr *fileset)
1152 {
1153         struct logicalVolDesc *lvd;
1154         int i, j, offset;
1155         uint8_t type;
1156         struct udf_sb_info *sbi = UDF_SB(sb);
1157         struct genericPartitionMap *gpm;
1158
1159         lvd = (struct logicalVolDesc *)bh->b_data;
1160
1161         i = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1162         if (i != 0)
1163                 return i;
1164
1165         for (i = 0, offset = 0;
1166              i < sbi->s_partitions && offset < le32_to_cpu(lvd->mapTableLength);
1167              i++, offset += gpm->partitionMapLength) {
1168                 struct udf_part_map *map = &sbi->s_partmaps[i];
1169                 gpm = (struct genericPartitionMap *)
1170                                 &(lvd->partitionMaps[offset]);
1171                 type = gpm->partitionMapType;
1172                 if (type == 1) {
1173                         struct genericPartitionMap1 *gpm1 =
1174                                 (struct genericPartitionMap1 *)gpm;
1175                         map->s_partition_type = UDF_TYPE1_MAP15;
1176                         map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1177                         map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1178                         map->s_partition_func = NULL;
1179                 } else if (type == 2) {
1180                         struct udfPartitionMap2 *upm2 =
1181                                                 (struct udfPartitionMap2 *)gpm;
1182                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1183                                                 strlen(UDF_ID_VIRTUAL))) {
1184                                 u16 suf =
1185                                         le16_to_cpu(((__le16 *)upm2->partIdent.
1186                                                         identSuffix)[0]);
1187                                 if (suf == 0x0150) {
1188                                         map->s_partition_type =
1189                                                         UDF_VIRTUAL_MAP15;
1190                                         map->s_partition_func =
1191                                                         udf_get_pblock_virt15;
1192                                 } else if (suf == 0x0200) {
1193                                         map->s_partition_type =
1194                                                         UDF_VIRTUAL_MAP20;
1195                                         map->s_partition_func =
1196                                                         udf_get_pblock_virt20;
1197                                 }
1198                         } else if (!strncmp(upm2->partIdent.ident,
1199                                                 UDF_ID_SPARABLE,
1200                                                 strlen(UDF_ID_SPARABLE))) {
1201                                 uint32_t loc;
1202                                 uint16_t ident;
1203                                 struct sparingTable *st;
1204                                 struct sparablePartitionMap *spm =
1205                                         (struct sparablePartitionMap *)gpm;
1206
1207                                 map->s_partition_type = UDF_SPARABLE_MAP15;
1208                                 map->s_type_specific.s_sparing.s_packet_len =
1209                                                 le16_to_cpu(spm->packetLength);
1210                                 for (j = 0; j < spm->numSparingTables; j++) {
1211                                         struct buffer_head *bh2;
1212
1213                                         loc = le32_to_cpu(
1214                                                 spm->locSparingTable[j]);
1215                                         bh2 = udf_read_tagged(sb, loc, loc,
1216                                                              &ident);
1217                                         map->s_type_specific.s_sparing.
1218                                                         s_spar_map[j] = bh2;
1219
1220                                         if (bh2 != NULL) {
1221                                                 st = (struct sparingTable *)
1222                                                                 bh2->b_data;
1223                                                 if (ident != 0 || strncmp(
1224                                                         st->sparingIdent.ident,
1225                                                         UDF_ID_SPARING,
1226                                                         strlen(UDF_ID_SPARING))) {
1227                                                         brelse(bh2);
1228                                                         map->s_type_specific.
1229                                                                 s_sparing.
1230                                                                 s_spar_map[j] =
1231                                                                         NULL;
1232                                                 }
1233                                         }
1234                                 }
1235                                 map->s_partition_func = udf_get_pblock_spar15;
1236                         } else {
1237                                 udf_debug("Unknown ident: %s\n",
1238                                           upm2->partIdent.ident);
1239                                 continue;
1240                         }
1241                         map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1242                         map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1243                 }
1244                 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1245                           i, map->s_partition_num, type,
1246                           map->s_volumeseqnum);
1247         }
1248
1249         if (fileset) {
1250                 long_ad *la = (long_ad *)&(lvd->logicalVolContentsUse[0]);
1251
1252                 *fileset = lelb_to_cpu(la->extLocation);
1253                 udf_debug("FileSet found in LogicalVolDesc at block=%d, "
1254                           "partition=%d\n", fileset->logicalBlockNum,
1255                           fileset->partitionReferenceNum);
1256         }
1257         if (lvd->integritySeqExt.extLength)
1258                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1259
1260         return 0;
1261 }
1262
1263 /*
1264  * udf_load_logicalvolint
1265  *
1266  */
1267 static void udf_load_logicalvolint(struct super_block *sb, kernel_extent_ad loc)
1268 {
1269         struct buffer_head *bh = NULL;
1270         uint16_t ident;
1271         struct udf_sb_info *sbi = UDF_SB(sb);
1272         struct logicalVolIntegrityDesc *lvid;
1273
1274         while (loc.extLength > 0 &&
1275                (bh = udf_read_tagged(sb, loc.extLocation,
1276                                      loc.extLocation, &ident)) &&
1277                ident == TAG_IDENT_LVID) {
1278                 sbi->s_lvid_bh = bh;
1279                 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1280
1281                 if (lvid->nextIntegrityExt.extLength)
1282                         udf_load_logicalvolint(sb,
1283                                 leea_to_cpu(lvid->nextIntegrityExt));
1284
1285                 if (sbi->s_lvid_bh != bh)
1286                         brelse(bh);
1287                 loc.extLength -= sb->s_blocksize;
1288                 loc.extLocation++;
1289         }
1290         if (sbi->s_lvid_bh != bh)
1291                 brelse(bh);
1292 }
1293
1294 /*
1295  * udf_process_sequence
1296  *
1297  * PURPOSE
1298  *      Process a main/reserve volume descriptor sequence.
1299  *
1300  * PRE-CONDITIONS
1301  *      sb                      Pointer to _locked_ superblock.
1302  *      block                   First block of first extent of the sequence.
1303  *      lastblock               Lastblock of first extent of the sequence.
1304  *
1305  * HISTORY
1306  *      July 1, 1997 - Andrew E. Mileski
1307  *      Written, tested, and released.
1308  */
1309 static int udf_process_sequence(struct super_block *sb, long block,
1310                                 long lastblock, kernel_lb_addr *fileset)
1311 {
1312         struct buffer_head *bh = NULL;
1313         struct udf_vds_record vds[VDS_POS_LENGTH];
1314         struct udf_vds_record *curr;
1315         struct generic_desc *gd;
1316         struct volDescPtr *vdp;
1317         int done = 0;
1318         int i, j;
1319         uint32_t vdsn;
1320         uint16_t ident;
1321         long next_s = 0, next_e = 0;
1322
1323         memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1324
1325         /* Read the main descriptor sequence */
1326         for (; (!done && block <= lastblock); block++) {
1327
1328                 bh = udf_read_tagged(sb, block, block, &ident);
1329                 if (!bh)
1330                         break;
1331
1332                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1333                 gd = (struct generic_desc *)bh->b_data;
1334                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1335                 switch (ident) {
1336                 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1337                         curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1338                         if (vdsn >= curr->volDescSeqNum) {
1339                                 curr->volDescSeqNum = vdsn;
1340                                 curr->block = block;
1341                         }
1342                         break;
1343                 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1344                         curr = &vds[VDS_POS_VOL_DESC_PTR];
1345                         if (vdsn >= curr->volDescSeqNum) {
1346                                 curr->volDescSeqNum = vdsn;
1347                                 curr->block = block;
1348
1349                                 vdp = (struct volDescPtr *)bh->b_data;
1350                                 next_s = le32_to_cpu(
1351                                         vdp->nextVolDescSeqExt.extLocation);
1352                                 next_e = le32_to_cpu(
1353                                         vdp->nextVolDescSeqExt.extLength);
1354                                 next_e = next_e >> sb->s_blocksize_bits;
1355                                 next_e += next_s;
1356                         }
1357                         break;
1358                 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1359                         curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1360                         if (vdsn >= curr->volDescSeqNum) {
1361                                 curr->volDescSeqNum = vdsn;
1362                                 curr->block = block;
1363                         }
1364                         break;
1365                 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1366                         curr = &vds[VDS_POS_PARTITION_DESC];
1367                         if (!curr->block)
1368                                 curr->block = block;
1369                         break;
1370                 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1371                         curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1372                         if (vdsn >= curr->volDescSeqNum) {
1373                                 curr->volDescSeqNum = vdsn;
1374                                 curr->block = block;
1375                         }
1376                         break;
1377                 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1378                         curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1379                         if (vdsn >= curr->volDescSeqNum) {
1380                                 curr->volDescSeqNum = vdsn;
1381                                 curr->block = block;
1382                         }
1383                         break;
1384                 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1385                         vds[VDS_POS_TERMINATING_DESC].block = block;
1386                         if (next_e) {
1387                                 block = next_s;
1388                                 lastblock = next_e;
1389                                 next_s = next_e = 0;
1390                         } else
1391                                 done = 1;
1392                         break;
1393                 }
1394                 brelse(bh);
1395         }
1396         for (i = 0; i < VDS_POS_LENGTH; i++) {
1397                 if (vds[i].block) {
1398                         bh = udf_read_tagged(sb, vds[i].block, vds[i].block,
1399                                              &ident);
1400
1401                         if (i == VDS_POS_PRIMARY_VOL_DESC) {
1402                                 udf_load_pvoldesc(sb, bh);
1403                         } else if (i == VDS_POS_LOGICAL_VOL_DESC) {
1404                                 if (udf_load_logicalvol(sb, bh, fileset)) {
1405                                         brelse(bh);
1406                                         return 1;
1407                                 }
1408                         } else if (i == VDS_POS_PARTITION_DESC) {
1409                                 struct buffer_head *bh2 = NULL;
1410                                 if (udf_load_partdesc(sb, bh)) {
1411                                         brelse(bh);
1412                                         return 1;
1413                                 }
1414                                 for (j = vds[i].block + 1;
1415                                      j <  vds[VDS_POS_TERMINATING_DESC].block;
1416                                      j++) {
1417                                         bh2 = udf_read_tagged(sb, j, j, &ident);
1418                                         gd = (struct generic_desc *)bh2->b_data;
1419                                         if (ident == TAG_IDENT_PD)
1420                                                 if (udf_load_partdesc(sb,
1421                                                                       bh2)) {
1422                                                         brelse(bh);
1423                                                         brelse(bh2);
1424                                                         return 1;
1425                                                 }
1426                                         brelse(bh2);
1427                                 }
1428                         }
1429                         brelse(bh);
1430                 }
1431         }
1432
1433         return 0;
1434 }
1435
1436 /*
1437  * udf_check_valid()
1438  */
1439 static int udf_check_valid(struct super_block *sb, int novrs, int silent)
1440 {
1441         long block;
1442
1443         if (novrs) {
1444                 udf_debug("Validity check skipped because of novrs option\n");
1445                 return 0;
1446         }
1447         /* Check that it is NSR02 compliant */
1448         /* Process any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
1449         else {
1450                 block = udf_vrs(sb, silent);
1451                 if (block == -1) {
1452                         struct udf_sb_info *sbi = UDF_SB(sb);
1453                         udf_debug("Failed to read byte 32768. Assuming open "
1454                                   "disc. Skipping validity check\n");
1455                         if (!sbi->s_last_block)
1456                                 sbi->s_last_block = udf_get_last_block(sb);
1457                         return 0;
1458                 } else
1459                         return !block;
1460         }
1461 }
1462
1463 static int udf_load_partition(struct super_block *sb, kernel_lb_addr *fileset)
1464 {
1465         struct anchorVolDescPtr *anchor;
1466         uint16_t ident;
1467         struct buffer_head *bh;
1468         long main_s, main_e, reserve_s, reserve_e;
1469         int i, j;
1470         struct udf_sb_info *sbi;
1471
1472         if (!sb)
1473                 return 1;
1474         sbi = UDF_SB(sb);
1475
1476         for (i = 0; i < ARRAY_SIZE(sbi->s_anchor); i++) {
1477                 if (!sbi->s_anchor[i])
1478                         continue;
1479                 bh = udf_read_tagged(sb, sbi->s_anchor[i], sbi->s_anchor[i],
1480                                      &ident);
1481                 if (!bh)
1482                         continue;
1483
1484                 anchor = (struct anchorVolDescPtr *)bh->b_data;
1485
1486                 /* Locate the main sequence */
1487                 main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1488                 main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1489                 main_e = main_e >> sb->s_blocksize_bits;
1490                 main_e += main_s;
1491
1492                 /* Locate the reserve sequence */
1493                 reserve_s = le32_to_cpu(
1494                                 anchor->reserveVolDescSeqExt.extLocation);
1495                 reserve_e = le32_to_cpu(
1496                                 anchor->reserveVolDescSeqExt.extLength);
1497                 reserve_e = reserve_e >> sb->s_blocksize_bits;
1498                 reserve_e += reserve_s;
1499
1500                 brelse(bh);
1501
1502                 /* Process the main & reserve sequences */
1503                 /* responsible for finding the PartitionDesc(s) */
1504                 if (!(udf_process_sequence(sb, main_s, main_e,
1505                                            fileset) &&
1506                       udf_process_sequence(sb, reserve_s, reserve_e,
1507                                            fileset)))
1508                         break;
1509         }
1510
1511         if (i == ARRAY_SIZE(sbi->s_anchor)) {
1512                 udf_debug("No Anchor block found\n");
1513                 return 1;
1514         }
1515         udf_debug("Using anchor in block %d\n", sbi->s_anchor[i]);
1516
1517         for (i = 0; i < sbi->s_partitions; i++) {
1518                 kernel_lb_addr uninitialized_var(ino);
1519                 struct udf_part_map *map = &sbi->s_partmaps[i];
1520                 switch (map->s_partition_type) {
1521                 case UDF_VIRTUAL_MAP15:
1522                 case UDF_VIRTUAL_MAP20:
1523                         if (!sbi->s_last_block) {
1524                                 sbi->s_last_block = udf_get_last_block(sb);
1525                                 udf_find_anchor(sb);
1526                         }
1527
1528                         if (!sbi->s_last_block) {
1529                                 udf_debug("Unable to determine Lastblock (For "
1530                                           "Virtual Partition)\n");
1531                                 return 1;
1532                         }
1533
1534                         for (j = 0; j < sbi->s_partitions; j++) {
1535                                 struct udf_part_map *map2 = &sbi->s_partmaps[j];
1536                                 if (j != i &&
1537                                     map->s_volumeseqnum ==
1538                                                 map2->s_volumeseqnum &&
1539                                     map->s_partition_num ==
1540                                                 map2->s_partition_num) {
1541                                         ino.partitionReferenceNum = j;
1542                                         ino.logicalBlockNum =
1543                                                 sbi->s_last_block -
1544                                                         map2->s_partition_root;
1545                                         break;
1546                                 }
1547                         }
1548
1549                         if (j == sbi->s_partitions)
1550                                 return 1;
1551
1552                         sbi->s_vat_inode = udf_iget(sb, ino);
1553                         if (!sbi->s_vat_inode)
1554                                 return 1;
1555
1556                         if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1557                                 map->s_type_specific.s_virtual.s_start_offset =
1558                                         udf_ext0_offset(sbi->s_vat_inode);
1559                                 map->s_type_specific.s_virtual.s_num_entries =
1560                                         (sbi->s_vat_inode->i_size - 36) >> 2;
1561                         } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1562                                 uint32_t pos;
1563                                 struct virtualAllocationTable20 *vat20;
1564
1565                                 pos = udf_block_map(sbi->s_vat_inode, 0);
1566                                 bh = sb_bread(sb, pos);
1567                                 if (!bh)
1568                                         return 1;
1569                                 vat20 = (struct virtualAllocationTable20 *)
1570                                         bh->b_data +
1571                                         udf_ext0_offset(sbi->s_vat_inode);
1572                                 map->s_type_specific.s_virtual.s_start_offset =
1573                                         le16_to_cpu(vat20->lengthHeader) +
1574                                         udf_ext0_offset(sbi->s_vat_inode);
1575                                 map->s_type_specific.s_virtual.s_num_entries =
1576                                         (sbi->s_vat_inode->i_size -
1577                                          map->s_type_specific.s_virtual.
1578                                                         s_start_offset) >> 2;
1579                                 brelse(bh);
1580                         }
1581                         map->s_partition_root = udf_get_pblock(sb, 0, i, 0);
1582                         map->s_partition_len =
1583                                 sbi->s_partmaps[ino.partitionReferenceNum].
1584                                                                 s_partition_len;
1585                 }
1586         }
1587         return 0;
1588 }
1589
1590 static void udf_open_lvid(struct super_block *sb)
1591 {
1592         struct udf_sb_info *sbi = UDF_SB(sb);
1593         struct buffer_head *bh = sbi->s_lvid_bh;
1594         if (bh) {
1595                 kernel_timestamp cpu_time;
1596                 struct logicalVolIntegrityDesc *lvid =
1597                                 (struct logicalVolIntegrityDesc *)bh->b_data;
1598                 struct logicalVolIntegrityDescImpUse *lvidiu =
1599                                                         udf_sb_lvidiu(sbi);
1600
1601                 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1602                 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1603                 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
1604                         lvid->recordingDateAndTime = cpu_to_lets(cpu_time);
1605                 lvid->integrityType = LVID_INTEGRITY_TYPE_OPEN;
1606
1607                 lvid->descTag.descCRC = cpu_to_le16(
1608                         udf_crc((char *)lvid + sizeof(tag),
1609                                 le16_to_cpu(lvid->descTag.descCRCLength),
1610                                 0));
1611
1612                 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1613                 mark_buffer_dirty(bh);
1614         }
1615 }
1616
1617 static void udf_close_lvid(struct super_block *sb)
1618 {
1619         kernel_timestamp cpu_time;
1620         struct udf_sb_info *sbi = UDF_SB(sb);
1621         struct buffer_head *bh = sbi->s_lvid_bh;
1622         struct logicalVolIntegrityDesc *lvid;
1623
1624         if (!bh)
1625                 return;
1626
1627         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1628
1629         if (lvid->integrityType == LVID_INTEGRITY_TYPE_OPEN) {
1630                 struct logicalVolIntegrityDescImpUse *lvidiu =
1631                                                         udf_sb_lvidiu(sbi);
1632                 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1633                 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1634                 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
1635                         lvid->recordingDateAndTime = cpu_to_lets(cpu_time);
1636                 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1637                         lvidiu->maxUDFWriteRev =
1638                                         cpu_to_le16(UDF_MAX_WRITE_VERSION);
1639                 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1640                         lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1641                 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
1642                         lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
1643                 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1644
1645                 lvid->descTag.descCRC = cpu_to_le16(
1646                         udf_crc((char *)lvid + sizeof(tag),
1647                                 le16_to_cpu(lvid->descTag.descCRCLength),
1648                                 0));
1649
1650                 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1651                 mark_buffer_dirty(bh);
1652         }
1653 }
1654
1655 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
1656 {
1657         int i;
1658         int nr_groups = bitmap->s_nr_groups;
1659         int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
1660                                                 nr_groups);
1661
1662         for (i = 0; i < nr_groups; i++)
1663                 if (bitmap->s_block_bitmap[i])
1664                         brelse(bitmap->s_block_bitmap[i]);
1665
1666         if (size <= PAGE_SIZE)
1667                 kfree(bitmap);
1668         else
1669                 vfree(bitmap);
1670 }
1671
1672 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1673 {
1674         int i;
1675         struct inode *inode = NULL;
1676         struct udf_options uopt;
1677         kernel_lb_addr rootdir, fileset;
1678         struct udf_sb_info *sbi;
1679
1680         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1681         uopt.uid = -1;
1682         uopt.gid = -1;
1683         uopt.umask = 0;
1684
1685         sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1686         if (!sbi)
1687                 return -ENOMEM;
1688
1689         sb->s_fs_info = sbi;
1690
1691         mutex_init(&sbi->s_alloc_mutex);
1692
1693         if (!udf_parse_options((char *)options, &uopt, false))
1694                 goto error_out;
1695
1696         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1697             uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
1698                 udf_error(sb, "udf_read_super",
1699                           "utf8 cannot be combined with iocharset\n");
1700                 goto error_out;
1701         }
1702 #ifdef CONFIG_UDF_NLS
1703         if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1704                 uopt.nls_map = load_nls_default();
1705                 if (!uopt.nls_map)
1706                         uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1707                 else
1708                         udf_debug("Using default NLS map\n");
1709         }
1710 #endif
1711         if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1712                 uopt.flags |= (1 << UDF_FLAG_UTF8);
1713
1714         fileset.logicalBlockNum = 0xFFFFFFFF;
1715         fileset.partitionReferenceNum = 0xFFFF;
1716
1717         sbi->s_flags = uopt.flags;
1718         sbi->s_uid = uopt.uid;
1719         sbi->s_gid = uopt.gid;
1720         sbi->s_umask = uopt.umask;
1721         sbi->s_nls_map = uopt.nls_map;
1722
1723         /* Set the block size for all transfers */
1724         if (!sb_min_blocksize(sb, uopt.blocksize)) {
1725                 udf_debug("Bad block size (%d)\n", uopt.blocksize);
1726                 printk(KERN_ERR "udf: bad block size (%d)\n", uopt.blocksize);
1727                 goto error_out;
1728         }
1729
1730         if (uopt.session == 0xFFFFFFFF)
1731                 sbi->s_session = udf_get_last_session(sb);
1732         else
1733                 sbi->s_session = uopt.session;
1734
1735         udf_debug("Multi-session=%d\n", sbi->s_session);
1736
1737         sbi->s_last_block = uopt.lastblock;
1738         sbi->s_anchor[0] = sbi->s_anchor[1] = 0;
1739         sbi->s_anchor[2] = uopt.anchor;
1740         sbi->s_anchor[3] = 256;
1741
1742         if (udf_check_valid(sb, uopt.novrs, silent)) {
1743                 /* read volume recognition sequences */
1744                 printk(KERN_WARNING "UDF-fs: No VRS found\n");
1745                 goto error_out;
1746         }
1747
1748         udf_find_anchor(sb);
1749
1750         /* Fill in the rest of the superblock */
1751         sb->s_op = &udf_sb_ops;
1752         sb->dq_op = NULL;
1753         sb->s_dirt = 0;
1754         sb->s_magic = UDF_SUPER_MAGIC;
1755         sb->s_time_gran = 1000;
1756
1757         if (udf_load_partition(sb, &fileset)) {
1758                 printk(KERN_WARNING "UDF-fs: No partition found (1)\n");
1759                 goto error_out;
1760         }
1761
1762         udf_debug("Lastblock=%d\n", sbi->s_last_block);
1763
1764         if (sbi->s_lvid_bh) {
1765                 struct logicalVolIntegrityDescImpUse *lvidiu =
1766                                                         udf_sb_lvidiu(sbi);
1767                 uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
1768                 uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
1769                 /* uint16_t maxUDFWriteRev =
1770                                 le16_to_cpu(lvidiu->maxUDFWriteRev); */
1771
1772                 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
1773                         printk(KERN_ERR "UDF-fs: minUDFReadRev=%x "
1774                                         "(max is %x)\n",
1775                                le16_to_cpu(lvidiu->minUDFReadRev),
1776                                UDF_MAX_READ_VERSION);
1777                         goto error_out;
1778                 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
1779                         sb->s_flags |= MS_RDONLY;
1780
1781                 sbi->s_udfrev = minUDFWriteRev;
1782
1783                 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1784                         UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
1785                 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
1786                         UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
1787         }
1788
1789         if (!sbi->s_partitions) {
1790                 printk(KERN_WARNING "UDF-fs: No partition found (2)\n");
1791                 goto error_out;
1792         }
1793
1794         if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
1795                         UDF_PART_FLAG_READ_ONLY) {
1796                 printk(KERN_NOTICE "UDF-fs: Partition marked readonly; "
1797                                    "forcing readonly mount\n");
1798                 sb->s_flags |= MS_RDONLY;
1799         }
1800
1801         if (udf_find_fileset(sb, &fileset, &rootdir)) {
1802                 printk(KERN_WARNING "UDF-fs: No fileset found\n");
1803                 goto error_out;
1804         }
1805
1806         if (!silent) {
1807                 kernel_timestamp ts;
1808                 udf_time_to_stamp(&ts, sbi->s_record_time);
1809                 udf_info("UDF: Mounting volume '%s', "
1810                          "timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
1811                          sbi->s_volume_ident, ts.year, ts.month, ts.day,
1812                          ts.hour, ts.minute, ts.typeAndTimezone);
1813         }
1814         if (!(sb->s_flags & MS_RDONLY))
1815                 udf_open_lvid(sb);
1816
1817         /* Assign the root inode */
1818         /* assign inodes by physical block number */
1819         /* perhaps it's not extensible enough, but for now ... */
1820         inode = udf_iget(sb, rootdir);
1821         if (!inode) {
1822                 printk(KERN_ERR "UDF-fs: Error in udf_iget, block=%d, "
1823                                 "partition=%d\n",
1824                        rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
1825                 goto error_out;
1826         }
1827
1828         /* Allocate a dentry for the root inode */
1829         sb->s_root = d_alloc_root(inode);
1830         if (!sb->s_root) {
1831                 printk(KERN_ERR "UDF-fs: Couldn't allocate root dentry\n");
1832                 iput(inode);
1833                 goto error_out;
1834         }
1835         sb->s_maxbytes = MAX_LFS_FILESIZE;
1836         return 0;
1837
1838 error_out:
1839         if (sbi->s_vat_inode)
1840                 iput(sbi->s_vat_inode);
1841         if (sbi->s_partitions) {
1842                 struct udf_part_map *map = &sbi->s_partmaps[sbi->s_partition];
1843                 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1844                         iput(map->s_uspace.s_table);
1845                 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1846                         iput(map->s_fspace.s_table);
1847                 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1848                         udf_sb_free_bitmap(map->s_uspace.s_bitmap);
1849                 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1850                         udf_sb_free_bitmap(map->s_fspace.s_bitmap);
1851                 if (map->s_partition_type == UDF_SPARABLE_MAP15)
1852                         for (i = 0; i < 4; i++)
1853                                 brelse(map->s_type_specific.s_sparing.
1854                                                 s_spar_map[i]);
1855         }
1856 #ifdef CONFIG_UDF_NLS
1857         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1858                 unload_nls(sbi->s_nls_map);
1859 #endif
1860         if (!(sb->s_flags & MS_RDONLY))
1861                 udf_close_lvid(sb);
1862         brelse(sbi->s_lvid_bh);
1863
1864         kfree(sbi->s_partmaps);
1865         kfree(sbi);
1866         sb->s_fs_info = NULL;
1867
1868         return -EINVAL;
1869 }
1870
1871 void udf_error(struct super_block *sb, const char *function,
1872                const char *fmt, ...)
1873 {
1874         va_list args;
1875
1876         if (!(sb->s_flags & MS_RDONLY)) {
1877                 /* mark sb error */
1878                 sb->s_dirt = 1;
1879         }
1880         va_start(args, fmt);
1881         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1882         va_end(args);
1883         printk(KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
1884                 sb->s_id, function, error_buf);
1885 }
1886
1887 void udf_warning(struct super_block *sb, const char *function,
1888                  const char *fmt, ...)
1889 {
1890         va_list args;
1891
1892         va_start(args, fmt);
1893         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1894         va_end(args);
1895         printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
1896                sb->s_id, function, error_buf);
1897 }
1898
1899 static void udf_put_super(struct super_block *sb)
1900 {
1901         int i;
1902         struct udf_sb_info *sbi;
1903
1904         sbi = UDF_SB(sb);
1905         if (sbi->s_vat_inode)
1906                 iput(sbi->s_vat_inode);
1907         if (sbi->s_partitions) {
1908                 struct udf_part_map *map = &sbi->s_partmaps[sbi->s_partition];
1909                 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1910                         iput(map->s_uspace.s_table);
1911                 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1912                         iput(map->s_fspace.s_table);
1913                 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1914                         udf_sb_free_bitmap(map->s_uspace.s_bitmap);
1915                 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1916                         udf_sb_free_bitmap(map->s_fspace.s_bitmap);
1917                 if (map->s_partition_type == UDF_SPARABLE_MAP15)
1918                         for (i = 0; i < 4; i++)
1919                                 brelse(map->s_type_specific.s_sparing.
1920                                                 s_spar_map[i]);
1921         }
1922 #ifdef CONFIG_UDF_NLS
1923         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1924                 unload_nls(sbi->s_nls_map);
1925 #endif
1926         if (!(sb->s_flags & MS_RDONLY))
1927                 udf_close_lvid(sb);
1928         brelse(sbi->s_lvid_bh);
1929         kfree(sbi->s_partmaps);
1930         kfree(sb->s_fs_info);
1931         sb->s_fs_info = NULL;
1932 }
1933
1934 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
1935 {
1936         struct super_block *sb = dentry->d_sb;
1937         struct udf_sb_info *sbi = UDF_SB(sb);
1938         struct logicalVolIntegrityDescImpUse *lvidiu;
1939
1940         if (sbi->s_lvid_bh != NULL)
1941                 lvidiu = udf_sb_lvidiu(sbi);
1942         else
1943                 lvidiu = NULL;
1944
1945         buf->f_type = UDF_SUPER_MAGIC;
1946         buf->f_bsize = sb->s_blocksize;
1947         buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
1948         buf->f_bfree = udf_count_free(sb);
1949         buf->f_bavail = buf->f_bfree;
1950         buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
1951                                           le32_to_cpu(lvidiu->numDirs)) : 0)
1952                         + buf->f_bfree;
1953         buf->f_ffree = buf->f_bfree;
1954         /* __kernel_fsid_t f_fsid */
1955         buf->f_namelen = UDF_NAME_LEN - 2;
1956
1957         return 0;
1958 }
1959
1960 static unsigned char udf_bitmap_lookup[16] = {
1961         0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4
1962 };
1963
1964 static unsigned int udf_count_free_bitmap(struct super_block *sb,
1965                                           struct udf_bitmap *bitmap)
1966 {
1967         struct buffer_head *bh = NULL;
1968         unsigned int accum = 0;
1969         int index;
1970         int block = 0, newblock;
1971         kernel_lb_addr loc;
1972         uint32_t bytes;
1973         uint8_t value;
1974         uint8_t *ptr;
1975         uint16_t ident;
1976         struct spaceBitmapDesc *bm;
1977
1978         lock_kernel();
1979
1980         loc.logicalBlockNum = bitmap->s_extPosition;
1981         loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
1982         bh = udf_read_ptagged(sb, loc, 0, &ident);
1983
1984         if (!bh) {
1985                 printk(KERN_ERR "udf: udf_count_free failed\n");
1986                 goto out;
1987         } else if (ident != TAG_IDENT_SBD) {
1988                 brelse(bh);
1989                 printk(KERN_ERR "udf: udf_count_free failed\n");
1990                 goto out;
1991         }
1992
1993         bm = (struct spaceBitmapDesc *)bh->b_data;
1994         bytes = le32_to_cpu(bm->numOfBytes);
1995         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
1996         ptr = (uint8_t *)bh->b_data;
1997
1998         while (bytes > 0) {
1999                 while ((bytes > 0) && (index < sb->s_blocksize)) {
2000                         value = ptr[index];
2001                         accum += udf_bitmap_lookup[value & 0x0f];
2002                         accum += udf_bitmap_lookup[value >> 4];
2003                         index++;
2004                         bytes--;
2005                 }
2006                 if (bytes) {
2007                         brelse(bh);
2008                         newblock = udf_get_lb_pblock(sb, loc, ++block);
2009                         bh = udf_tread(sb, newblock);
2010                         if (!bh) {
2011                                 udf_debug("read failed\n");
2012                                 goto out;
2013                         }
2014                         index = 0;
2015                         ptr = (uint8_t *)bh->b_data;
2016                 }
2017         }
2018         brelse(bh);
2019
2020 out:
2021         unlock_kernel();
2022
2023         return accum;
2024 }
2025
2026 static unsigned int udf_count_free_table(struct super_block *sb,
2027                                          struct inode *table)
2028 {
2029         unsigned int accum = 0;
2030         uint32_t elen;
2031         kernel_lb_addr eloc;
2032         int8_t etype;
2033         struct extent_position epos;
2034
2035         lock_kernel();
2036
2037         epos.block = UDF_I(table)->i_location;
2038         epos.offset = sizeof(struct unallocSpaceEntry);
2039         epos.bh = NULL;
2040
2041         while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2042                 accum += (elen >> table->i_sb->s_blocksize_bits);
2043
2044         brelse(epos.bh);
2045
2046         unlock_kernel();
2047
2048         return accum;
2049 }
2050
2051 static unsigned int udf_count_free(struct super_block *sb)
2052 {
2053         unsigned int accum = 0;
2054         struct udf_sb_info *sbi;
2055         struct udf_part_map *map;
2056
2057         sbi = UDF_SB(sb);
2058         if (sbi->s_lvid_bh) {
2059                 struct logicalVolIntegrityDesc *lvid =
2060                         (struct logicalVolIntegrityDesc *)
2061                         sbi->s_lvid_bh->b_data;
2062                 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
2063                         accum = le32_to_cpu(
2064                                         lvid->freeSpaceTable[sbi->s_partition]);
2065                         if (accum == 0xFFFFFFFF)
2066                                 accum = 0;
2067                 }
2068         }
2069
2070         if (accum)
2071                 return accum;
2072
2073         map = &sbi->s_partmaps[sbi->s_partition];
2074         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2075                 accum += udf_count_free_bitmap(sb,
2076                                                map->s_uspace.s_bitmap);
2077         }
2078         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
2079                 accum += udf_count_free_bitmap(sb,
2080                                                map->s_fspace.s_bitmap);
2081         }
2082         if (accum)
2083                 return accum;
2084
2085         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2086                 accum += udf_count_free_table(sb,
2087                                               map->s_uspace.s_table);
2088         }
2089         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
2090                 accum += udf_count_free_table(sb,
2091                                               map->s_fspace.s_table);
2092         }
2093
2094         return accum;
2095 }