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 <linux/bitmap.h>
  59 #include <asm/byteorder.h>
  60
  61 #include "udf_sb.h"
  62 #include "udf_i.h"
  63
  64 #include <linux/init.h>
  65 #include <asm/uaccess.h>
  66
  67 #define VDS_POS_PRIMARY_VOL_DESC        0
  68 #define VDS_POS_UNALLOC_SPACE_DESC      1
  69 #define VDS_POS_LOGICAL_VOL_DESC        2
  70 #define VDS_POS_PARTITION_DESC          3
  71 #define VDS_POS_IMP_USE_VOL_DESC        4
  72 #define VDS_POS_VOL_DESC_PTR            5
  73 #define VDS_POS_TERMINATING_DESC        6
  74 #define VDS_POS_LENGTH                  7
  75
  76 #define UDF_DEFAULT_BLOCKSIZE 2048
  77
  78 static char error_buf[1024];
  79
  80 /* These are the "meat" - everything else is stuffing */
  81 static int udf_fill_super(struct super_block *, void *, int);
  82 static void udf_put_super(struct super_block *);
  83 static void udf_write_super(struct super_block *);
  84 static int udf_remount_fs(struct super_block *, int *, char *);
  85 static int udf_check_valid(struct super_block *, int, int);
  86 static int udf_vrs(struct super_block *sb, int silent);
  87 static int udf_load_partition(struct super_block *, kernel_lb_addr *);
  88 static void udf_load_logicalvolint(struct super_block *, kernel_extent_ad);
  89 static void udf_find_anchor(struct super_block *);
  90 static int udf_find_fileset(struct super_block *, kernel_lb_addr *,
  91                             kernel_lb_addr *);
  92 static void udf_load_fileset(struct super_block *, struct buffer_head *,
  93                              kernel_lb_addr *);
  94 static void udf_open_lvid(struct super_block *);
  95 static void udf_close_lvid(struct super_block *);
  96 static unsigned int udf_count_free(struct super_block *);
  97 static int udf_statfs(struct dentry *, struct kstatfs *);
  98 static int udf_show_options(struct seq_file *, struct vfsmount *);
  99 static void udf_error(struct super_block *sb, const char *function,
 100                       const char *fmt, ...);
 101
 102 struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct udf_sb_info *sbi)
 103 {
 104         struct logicalVolIntegrityDesc *lvid =
 105                 (struct logicalVolIntegrityDesc *)sbi->s_lvid_bh->b_data;
 106         __u32 number_of_partitions = le32_to_cpu(lvid->numOfPartitions);
 107         __u32 offset = number_of_partitions * 2 *
 108                                 sizeof(uint32_t)/sizeof(uint8_t);
 109         return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
 110 }
 111
 112 /* UDF filesystem type */
 113 static int udf_get_sb(struct file_system_type *fs_type,
 114                       int flags, const char *dev_name, void *data,
 115                       struct vfsmount *mnt)
 116 {
 117         return get_sb_bdev(fs_type, flags, dev_name, data, udf_fill_super, mnt);
 118 }
 119
 120 static struct file_system_type udf_fstype = {
 121         .owner          = THIS_MODULE,
 122         .name           = "udf",
 123         .get_sb         = udf_get_sb,
 124         .kill_sb        = kill_block_super,
 125         .fs_flags       = FS_REQUIRES_DEV,
 126 };
 127
 128 static struct kmem_cache *udf_inode_cachep;
 129
 130 static struct inode *udf_alloc_inode(struct super_block *sb)
 131 {
 132         struct udf_inode_info *ei;
 133         ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
 134         if (!ei)
 135                 return NULL;
 136
 137         ei->i_unique = 0;
 138         ei->i_lenExtents = 0;
 139         ei->i_next_alloc_block = 0;
 140         ei->i_next_alloc_goal = 0;
 141         ei->i_strat4096 = 0;
 142
 143         return &ei->vfs_inode;
 144 }
 145
 146 static void udf_destroy_inode(struct inode *inode)
 147 {
 148         kmem_cache_free(udf_inode_cachep, UDF_I(inode));
 149 }
 150
 151 static void init_once(struct kmem_cache *cachep, void *foo)
 152 {
 153         struct udf_inode_info *ei = (struct udf_inode_info *)foo;
 154
 155         ei->i_ext.i_data = NULL;
 156         inode_init_once(&ei->vfs_inode);
 157 }
 158
 159 static int init_inodecache(void)
 160 {
 161         udf_inode_cachep = kmem_cache_create("udf_inode_cache",
 162                                              sizeof(struct udf_inode_info),
 163                                              0, (SLAB_RECLAIM_ACCOUNT |
 164                                                  SLAB_MEM_SPREAD),
 165                                              init_once);
 166         if (!udf_inode_cachep)
 167                 return -ENOMEM;
 168         return 0;
 169 }
 170
 171 static void destroy_inodecache(void)
 172 {
 173         kmem_cache_destroy(udf_inode_cachep);
 174 }
 175
 176 /* Superblock operations */
 177 static const struct super_operations udf_sb_ops = {
 178         .alloc_inode    = udf_alloc_inode,
 179         .destroy_inode  = udf_destroy_inode,
 180         .write_inode    = udf_write_inode,
 181         .delete_inode   = udf_delete_inode,
 182         .clear_inode    = udf_clear_inode,
 183         .put_super      = udf_put_super,
 184         .write_super    = udf_write_super,
 185         .statfs         = udf_statfs,
 186         .remount_fs     = udf_remount_fs,
 187         .show_options   = udf_show_options,
 188 };
 189
 190 struct udf_options {
 191         unsigned char novrs;
 192         unsigned int blocksize;
 193         unsigned int session;
 194         unsigned int lastblock;
 195         unsigned int anchor;
 196         unsigned int volume;
 197         unsigned short partition;
 198         unsigned int fileset;
 199         unsigned int rootdir;
 200         unsigned int flags;
 201         mode_t umask;
 202         gid_t gid;
 203         uid_t uid;
 204         struct nls_table *nls_map;
 205 };
 206
 207 static int __init init_udf_fs(void)
 208 {
 209         int err;
 210
 211         err = init_inodecache();
 212         if (err)
 213                 goto out1;
 214         err = register_filesystem(&udf_fstype);
 215         if (err)
 216                 goto out;
 217
 218         return 0;
 219
 220 out:
 221         destroy_inodecache();
 222
 223 out1:
 224         return err;
 225 }
 226
 227 static void __exit exit_udf_fs(void)
 228 {
 229         unregister_filesystem(&udf_fstype);
 230         destroy_inodecache();
 231 }
 232
 233 module_init(init_udf_fs)
 234 module_exit(exit_udf_fs)
 235
 236 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
 237 {
 238         struct udf_sb_info *sbi = UDF_SB(sb);
 239
 240         sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map),
 241                                   GFP_KERNEL);
 242         if (!sbi->s_partmaps) {
 243                 udf_error(sb, __FUNCTION__,
 244                           "Unable to allocate space for %d partition maps",
 245                           count);
 246                 sbi->s_partitions = 0;
 247                 return -ENOMEM;
 248         }
 249
 250         sbi->s_partitions = count;
 251         return 0;
 252 }
 253
 254 static int udf_show_options(struct seq_file *seq, struct vfsmount *mnt)
 255 {
 256         struct super_block *sb = mnt->mnt_sb;
 257         struct udf_sb_info *sbi = UDF_SB(sb);
 258
 259         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
 260                 seq_puts(seq, ",nostrict");
 261         if (sb->s_blocksize != UDF_DEFAULT_BLOCKSIZE)
 262                 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
 263         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
 264                 seq_puts(seq, ",unhide");
 265         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
 266                 seq_puts(seq, ",undelete");
 267         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
 268                 seq_puts(seq, ",noadinicb");
 269         if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
 270                 seq_puts(seq, ",shortad");
 271         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
 272                 seq_puts(seq, ",uid=forget");
 273         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_IGNORE))
 274                 seq_puts(seq, ",uid=ignore");
 275         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
 276                 seq_puts(seq, ",gid=forget");
 277         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE))
 278                 seq_puts(seq, ",gid=ignore");
 279         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
 280                 seq_printf(seq, ",uid=%u", sbi->s_uid);
 281         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
 282                 seq_printf(seq, ",gid=%u", sbi->s_gid);
 283         if (sbi->s_umask != 0)
 284                 seq_printf(seq, ",umask=%o", sbi->s_umask);
 285         if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
 286                 seq_printf(seq, ",session=%u", sbi->s_session);
 287         if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
 288                 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
 289         /*
 290          * s_anchor[2] could be zeroed out in case there is no anchor
 291          * in the specified block, but then the "anchor=N" option
 292          * originally given by the user wasn't effective, so it's OK
 293          * if we don't show it.
 294          */
 295         if (sbi->s_anchor[2] != 0)
 296                 seq_printf(seq, ",anchor=%u", sbi->s_anchor[2]);
 297         /*
 298          * volume, partition, fileset and rootdir seem to be ignored
 299          * currently
 300          */
 301         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
 302                 seq_puts(seq, ",utf8");
 303         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
 304                 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
 305
 306         return 0;
 307 }
 308
 309 /*
 310  * udf_parse_options
 311  *
 312  * PURPOSE
 313  *      Parse mount options.
 314  *
 315  * DESCRIPTION
 316  *      The following mount options are supported:
 317  *
 318  *      gid=            Set the default group.
 319  *      umask=          Set the default umask.
 320  *      uid=            Set the default user.
 321  *      bs=             Set the block size.
 322  *      unhide          Show otherwise hidden files.
 323  *      undelete        Show deleted files in lists.
 324  *      adinicb         Embed data in the inode (default)
 325  *      noadinicb       Don't embed data in the inode
 326  *      shortad         Use short ad's
 327  *      longad          Use long ad's (default)
 328  *      nostrict        Unset strict conformance
 329  *      iocharset=      Set the NLS character set
 330  *
 331  *      The remaining are for debugging and disaster recovery:
 332  *
 333  *      novrs           Skip volume sequence recognition
 334  *
 335  *      The following expect a offset from 0.
 336  *
 337  *      session=        Set the CDROM session (default= last session)
 338  *      anchor=         Override standard anchor location. (default= 256)
 339  *      volume=         Override the VolumeDesc location. (unused)
 340  *      partition=      Override the PartitionDesc location. (unused)
 341  *      lastblock=      Set the last block of the filesystem/
 342  *
 343  *      The following expect a offset from the partition root.
 344  *
 345  *      fileset=        Override the fileset block location. (unused)
 346  *      rootdir=        Override the root directory location. (unused)
 347  *              WARNING: overriding the rootdir to a non-directory may
 348  *              yield highly unpredictable results.
 349  *
 350  * PRE-CONDITIONS
 351  *      options         Pointer to mount options string.
 352  *      uopts           Pointer to mount options variable.
 353  *
 354  * POST-CONDITIONS
 355  *      <return>        1       Mount options parsed okay.
 356  *      <return>        0       Error parsing mount options.
 357  *
 358  * HISTORY
 359  *      July 1, 1997 - Andrew E. Mileski
 360  *      Written, tested, and released.
 361  */
 362
 363 enum {
 364         Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
 365         Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
 366         Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
 367         Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
 368         Opt_rootdir, Opt_utf8, Opt_iocharset,
 369         Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore
 370 };
 371
 372 static match_table_t tokens = {
 373         {Opt_novrs,     "novrs"},
 374         {Opt_nostrict,  "nostrict"},
 375         {Opt_bs,        "bs=%u"},
 376         {Opt_unhide,    "unhide"},
 377         {Opt_undelete,  "undelete"},
 378         {Opt_noadinicb, "noadinicb"},
 379         {Opt_adinicb,   "adinicb"},
 380         {Opt_shortad,   "shortad"},
 381         {Opt_longad,    "longad"},
 382         {Opt_uforget,   "uid=forget"},
 383         {Opt_uignore,   "uid=ignore"},
 384         {Opt_gforget,   "gid=forget"},
 385         {Opt_gignore,   "gid=ignore"},
 386         {Opt_gid,       "gid=%u"},
 387         {Opt_uid,       "uid=%u"},
 388         {Opt_umask,     "umask=%o"},
 389         {Opt_session,   "session=%u"},
 390         {Opt_lastblock, "lastblock=%u"},
 391         {Opt_anchor,    "anchor=%u"},
 392         {Opt_volume,    "volume=%u"},
 393         {Opt_partition, "partition=%u"},
 394         {Opt_fileset,   "fileset=%u"},
 395         {Opt_rootdir,   "rootdir=%u"},
 396         {Opt_utf8,      "utf8"},
 397         {Opt_iocharset, "iocharset=%s"},
 398         {Opt_err,       NULL}
 399 };
 400
 401 static int udf_parse_options(char *options, struct udf_options *uopt,
 402                              bool remount)
 403 {
 404         char *p;
 405         int option;
 406
 407         uopt->novrs = 0;
 408         uopt->blocksize = UDF_DEFAULT_BLOCKSIZE;
 409         uopt->partition = 0xFFFF;
 410         uopt->session = 0xFFFFFFFF;
 411         uopt->lastblock = 0;
 412         uopt->anchor = 0;
 413         uopt->volume = 0xFFFFFFFF;
 414         uopt->rootdir = 0xFFFFFFFF;
 415         uopt->fileset = 0xFFFFFFFF;
 416         uopt->nls_map = NULL;
 417
 418         if (!options)
 419                 return 1;
 420
 421         while ((p = strsep(&options, ",")) != NULL) {
 422                 substring_t args[MAX_OPT_ARGS];
 423                 int token;
 424                 if (!*p)
 425                         continue;
 426
 427                 token = match_token(p, tokens, args);
 428                 switch (token) {
 429                 case Opt_novrs:
 430                         uopt->novrs = 1;
 431                 case Opt_bs:
 432                         if (match_int(&args[0], &option))
 433                                 return 0;
 434                         uopt->blocksize = option;
 435                         break;
 436                 case Opt_unhide:
 437                         uopt->flags |= (1 << UDF_FLAG_UNHIDE);
 438                         break;
 439                 case Opt_undelete:
 440                         uopt->flags |= (1 << UDF_FLAG_UNDELETE);
 441                         break;
 442                 case Opt_noadinicb:
 443                         uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
 444                         break;
 445                 case Opt_adinicb:
 446                         uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
 447                         break;
 448                 case Opt_shortad:
 449                         uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
 450                         break;
 451                 case Opt_longad:
 452                         uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
 453                         break;
 454                 case Opt_gid:
 455                         if (match_int(args, &option))
 456                                 return 0;
 457                         uopt->gid = option;
 458                         uopt->flags |= (1 << UDF_FLAG_GID_SET);
 459                         break;
 460                 case Opt_uid:
 461                         if (match_int(args, &option))
 462                                 return 0;
 463                         uopt->uid = option;
 464                         uopt->flags |= (1 << UDF_FLAG_UID_SET);
 465                         break;
 466                 case Opt_umask:
 467                         if (match_octal(args, &option))
 468                                 return 0;
 469                         uopt->umask = option;
 470                         break;
 471                 case Opt_nostrict:
 472                         uopt->flags &= ~(1 << UDF_FLAG_STRICT);
 473                         break;
 474                 case Opt_session:
 475                         if (match_int(args, &option))
 476                                 return 0;
 477                         uopt->session = option;
 478                         if (!remount)
 479                                 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
 480                         break;
 481                 case Opt_lastblock:
 482                         if (match_int(args, &option))
 483                                 return 0;
 484                         uopt->lastblock = option;
 485                         if (!remount)
 486                                 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
 487                         break;
 488                 case Opt_anchor:
 489                         if (match_int(args, &option))
 490                                 return 0;
 491                         uopt->anchor = option;
 492                         break;
 493                 case Opt_volume:
 494                         if (match_int(args, &option))
 495                                 return 0;
 496                         uopt->volume = option;
 497                         break;
 498                 case Opt_partition:
 499                         if (match_int(args, &option))
 500                                 return 0;
 501                         uopt->partition = option;
 502                         break;
 503                 case Opt_fileset:
 504                         if (match_int(args, &option))
 505                                 return 0;
 506                         uopt->fileset = option;
 507                         break;
 508                 case Opt_rootdir:
 509                         if (match_int(args, &option))
 510                                 return 0;
 511                         uopt->rootdir = option;
 512                         break;
 513                 case Opt_utf8:
 514                         uopt->flags |= (1 << UDF_FLAG_UTF8);
 515                         break;
 516 #ifdef CONFIG_UDF_NLS
 517                 case Opt_iocharset:
 518                         uopt->nls_map = load_nls(args[0].from);
 519                         uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
 520                         break;
 521 #endif
 522                 case Opt_uignore:
 523                         uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
 524                         break;
 525                 case Opt_uforget:
 526                         uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
 527                         break;
 528                 case Opt_gignore:
 529                         uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
 530                         break;
 531                 case Opt_gforget:
 532                         uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
 533                         break;
 534                 default:
 535                         printk(KERN_ERR "udf: bad mount option \"%s\" "
 536                                "or missing value\n", p);
 537                         return 0;
 538                 }
 539         }
 540         return 1;
 541 }
 542
 543 static void udf_write_super(struct super_block *sb)
 544 {
 545         lock_kernel();
 546
 547         if (!(sb->s_flags & MS_RDONLY))
 548                 udf_open_lvid(sb);
 549         sb->s_dirt = 0;
 550
 551         unlock_kernel();
 552 }
 553
 554 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
 555 {
 556         struct udf_options uopt;
 557         struct udf_sb_info *sbi = UDF_SB(sb);
 558
 559         uopt.flags = sbi->s_flags;
 560         uopt.uid   = sbi->s_uid;
 561         uopt.gid   = sbi->s_gid;
 562         uopt.umask = sbi->s_umask;
 563
 564         if (!udf_parse_options(options, &uopt, true))
 565                 return -EINVAL;
 566
 567         sbi->s_flags = uopt.flags;
 568         sbi->s_uid   = uopt.uid;
 569         sbi->s_gid   = uopt.gid;
 570         sbi->s_umask = uopt.umask;
 571
 572         if (sbi->s_lvid_bh) {
 573                 int write_rev = le16_to_cpu(udf_sb_lvidiu(sbi)->minUDFWriteRev);
 574                 if (write_rev > UDF_MAX_WRITE_VERSION)
 575                         *flags |= MS_RDONLY;
 576         }
 577
 578         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 579                 return 0;
 580         if (*flags & MS_RDONLY)
 581                 udf_close_lvid(sb);
 582         else
 583                 udf_open_lvid(sb);
 584
 585         return 0;
 586 }
 587
 588 static int udf_vrs(struct super_block *sb, int silent)
 589 {
 590         struct volStructDesc *vsd = NULL;
 591         int sector = 32768;
 592         int sectorsize;
 593         struct buffer_head *bh = NULL;
 594         int iso9660 = 0;
 595         int nsr02 = 0;
 596         int nsr03 = 0;
 597         struct udf_sb_info *sbi;
 598
 599         /* Block size must be a multiple of 512 */
 600         if (sb->s_blocksize & 511)
 601                 return 0;
 602         sbi = UDF_SB(sb);
 603
 604         if (sb->s_blocksize < sizeof(struct volStructDesc))
 605                 sectorsize = sizeof(struct volStructDesc);
 606         else
 607                 sectorsize = sb->s_blocksize;
 608
 609         sector += (sbi->s_session << sb->s_blocksize_bits);
 610
 611         udf_debug("Starting at sector %u (%ld byte sectors)\n",
 612                   (sector >> sb->s_blocksize_bits), sb->s_blocksize);
 613         /* Process the sequence (if applicable) */
 614         for (; !nsr02 && !nsr03; sector += sectorsize) {
 615                 /* Read a block */
 616                 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
 617                 if (!bh)
 618                         break;
 619
 620                 /* Look for ISO  descriptors */
 621                 vsd = (struct volStructDesc *)(bh->b_data +
 622                                               (sector & (sb->s_blocksize - 1)));
 623
 624                 if (vsd->stdIdent[0] == 0) {
 625                         brelse(bh);
 626                         break;
 627                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
 628                                     VSD_STD_ID_LEN)) {
 629                         iso9660 = sector;
 630                         switch (vsd->structType) {
 631                         case 0:
 632                                 udf_debug("ISO9660 Boot Record found\n");
 633                                 break;
 634                         case 1:
 635                                 udf_debug("ISO9660 Primary Volume Descriptor "
 636                                           "found\n");
 637                                 break;
 638                         case 2:
 639                                 udf_debug("ISO9660 Supplementary Volume "
 640                                           "Descriptor found\n");
 641                                 break;
 642                         case 3:
 643                                 udf_debug("ISO9660 Volume Partition Descriptor "
 644                                           "found\n");
 645                                 break;
 646                         case 255:
 647                                 udf_debug("ISO9660 Volume Descriptor Set "
 648                                           "Terminator found\n");
 649                                 break;
 650                         default:
 651                                 udf_debug("ISO9660 VRS (%u) found\n",
 652                                           vsd->structType);
 653                                 break;
 654                         }
 655                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
 656                                     VSD_STD_ID_LEN))
 657                         ; /* nothing */
 658                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
 659                                     VSD_STD_ID_LEN)) {
 660                         brelse(bh);
 661                         break;
 662                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
 663                                     VSD_STD_ID_LEN))
 664                         nsr02 = sector;
 665                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
 666                                     VSD_STD_ID_LEN))
 667                         nsr03 = sector;
 668                 brelse(bh);
 669         }
 670
 671         if (nsr03)
 672                 return nsr03;
 673         else if (nsr02)
 674                 return nsr02;
 675         else if (sector - (sbi->s_session << sb->s_blocksize_bits) == 32768)
 676                 return -1;
 677         else
 678                 return 0;
 679 }
 680
 681 /*
 682  * udf_find_anchor
 683  *
 684  * PURPOSE
 685  *      Find an anchor volume descriptor.
 686  *
 687  * PRE-CONDITIONS
 688  *      sb                      Pointer to _locked_ superblock.
 689  *      lastblock               Last block on media.
 690  *
 691  * POST-CONDITIONS
 692  *      <return>                1 if not found, 0 if ok
 693  *
 694  * HISTORY
 695  *      July 1, 1997 - Andrew E. Mileski
 696  *      Written, tested, and released.
 697  */
 698 static void udf_find_anchor(struct super_block *sb)
 699 {
 700         int lastblock;
 701         struct buffer_head *bh = NULL;
 702         uint16_t ident;
 703         uint32_t location;
 704         int i;
 705         struct udf_sb_info *sbi;
 706
 707         sbi = UDF_SB(sb);
 708         lastblock = sbi->s_last_block;
 709
 710         if (lastblock) {
 711                 int varlastblock = udf_variable_to_fixed(lastblock);
 712                 int last[] =  { lastblock, lastblock - 2,
 713                                 lastblock - 150, lastblock - 152,
 714                                 varlastblock, varlastblock - 2,
 715                                 varlastblock - 150, varlastblock - 152 };
 716
 717                 lastblock = 0;
 718
 719                 /* Search for an anchor volume descriptor pointer */
 720
 721                 /*  according to spec, anchor is in either:
 722                  *     block 256
 723                  *     lastblock-256
 724                  *     lastblock
 725                  *  however, if the disc isn't closed, it could be 512 */
 726
 727                 for (i = 0; !lastblock && i < ARRAY_SIZE(last); i++) {
 728                         ident = location = 0;
 729                         if (last[i] >= 0) {
 730                                 bh = sb_bread(sb, last[i]);
 731                                 if (bh) {
 732                                         tag *t = (tag *)bh->b_data;
 733                                         ident = le16_to_cpu(t->tagIdent);
 734                                         location = le32_to_cpu(t->tagLocation);
 735                                         brelse(bh);
 736                                 }
 737                         }
 738
 739                         if (ident == TAG_IDENT_AVDP) {
 740                                 if (location == last[i] - sbi->s_session) {
 741                                         lastblock = last[i] - sbi->s_session;
 742                                         sbi->s_anchor[0] = lastblock;
 743                                         sbi->s_anchor[1] = lastblock - 256;
 744                                 } else if (location ==
 745                                                 udf_variable_to_fixed(last[i]) -
 746                                                         sbi->s_session) {
 747                                         UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
 748                                         lastblock =
 749                                                 udf_variable_to_fixed(last[i]) -
 750                                                         sbi->s_session;
 751                                         sbi->s_anchor[0] = lastblock;
 752                                         sbi->s_anchor[1] = lastblock - 256 -
 753                                                                 sbi->s_session;
 754                                 } else {
 755                                         udf_debug("Anchor found at block %d, "
 756                                                   "location mismatch %d.\n",
 757                                                   last[i], location);
 758                                 }
 759                         } else if (ident == TAG_IDENT_FE ||
 760                                         ident == TAG_IDENT_EFE) {
 761                                 lastblock = last[i];
 762                                 sbi->s_anchor[3] = 512;
 763                         } else {
 764                                 ident = location = 0;
 765                                 if (last[i] >= 256) {
 766                                         bh = sb_bread(sb, last[i] - 256);
 767                                         if (bh) {
 768                                                 tag *t = (tag *)bh->b_data;
 769                                                 ident = le16_to_cpu(
 770                                                                 t->tagIdent);
 771                                                 location = le32_to_cpu(
 772                                                                 t->tagLocation);
 773                                                 brelse(bh);
 774                                         }
 775                                 }
 776
 777                                 if (ident == TAG_IDENT_AVDP &&
 778                                     location == last[i] - 256 -
 779                                                 sbi->s_session) {
 780                                         lastblock = last[i];
 781                                         sbi->s_anchor[1] = last[i] - 256;
 782                                 } else {
 783                                         ident = location = 0;
 784                                         if (last[i] >= 312 + sbi->s_session) {
 785                                                 bh = sb_bread(sb,
 786                                                                 last[i] - 312 -
 787                                                                 sbi->s_session);
 788                                                 if (bh) {
 789                                                         tag *t = (tag *)
 790                                                                  bh->b_data;
 791                                                         ident = le16_to_cpu(
 792                                                                 t->tagIdent);
 793                                                         location = le32_to_cpu(
 794                                                                 t->tagLocation);
 795                                                         brelse(bh);
 796                                                 }
 797                                         }
 798
 799                                         if (ident == TAG_IDENT_AVDP &&
 800                                             location == udf_variable_to_fixed(last[i]) - 256) {
 801                                                 UDF_SET_FLAG(sb,
 802                                                              UDF_FLAG_VARCONV);
 803                                                 lastblock = udf_variable_to_fixed(last[i]);
 804                                                 sbi->s_anchor[1] = lastblock - 256;
 805                                         }
 806                                 }
 807                         }
 808                 }
 809         }
 810
 811         if (!lastblock) {
 812                 /* We haven't found the lastblock. check 312 */
 813                 bh = sb_bread(sb, 312 + sbi->s_session);
 814                 if (bh) {
 815                         tag *t = (tag *)bh->b_data;
 816                         ident = le16_to_cpu(t->tagIdent);
 817                         location = le32_to_cpu(t->tagLocation);
 818                         brelse(bh);
 819
 820                         if (ident == TAG_IDENT_AVDP && location == 256)
 821                                 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
 822                 }
 823         }
 824
 825         for (i = 0; i < ARRAY_SIZE(sbi->s_anchor); i++) {
 826                 if (!sbi->s_anchor[i])
 827                         continue;
 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         sbi->s_last_block = lastblock;
 842 }
 843
 844 static int udf_find_fileset(struct super_block *sb,
 845                             kernel_lb_addr *fileset,
 846                             kernel_lb_addr *root)
 847 {
 848         struct buffer_head *bh = NULL;
 849         long lastblock;
 850         uint16_t ident;
 851         struct udf_sb_info *sbi;
 852
 853         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
 854             fileset->partitionReferenceNum != 0xFFFF) {
 855                 bh = udf_read_ptagged(sb, *fileset, 0, &ident);
 856
 857                 if (!bh) {
 858                         return 1;
 859                 } else if (ident != TAG_IDENT_FSD) {
 860                         brelse(bh);
 861                         return 1;
 862                 }
 863
 864         }
 865
 866         sbi = UDF_SB(sb);
 867         if (!bh) {
 868                 /* Search backwards through the partitions */
 869                 kernel_lb_addr newfileset;
 870
 871 /* --> cvg: FIXME - is it reasonable? */
 872                 return 1;
 873
 874                 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
 875                      (newfileset.partitionReferenceNum != 0xFFFF &&
 876                       fileset->logicalBlockNum == 0xFFFFFFFF &&
 877                       fileset->partitionReferenceNum == 0xFFFF);
 878                      newfileset.partitionReferenceNum--) {
 879                         lastblock = sbi->s_partmaps
 880                                         [newfileset.partitionReferenceNum]
 881                                                 .s_partition_len;
 882                         newfileset.logicalBlockNum = 0;
 883
 884                         do {
 885                                 bh = udf_read_ptagged(sb, newfileset, 0,
 886                                                       &ident);
 887                                 if (!bh) {
 888                                         newfileset.logicalBlockNum++;
 889                                         continue;
 890                                 }
 891
 892                                 switch (ident) {
 893                                 case TAG_IDENT_SBD:
 894                                 {
 895                                         struct spaceBitmapDesc *sp;
 896                                         sp = (struct spaceBitmapDesc *)
 897                                                                 bh->b_data;
 898                                         newfileset.logicalBlockNum += 1 +
 899                                                 ((le32_to_cpu(sp->numOfBytes) +
 900                                                   sizeof(struct spaceBitmapDesc)
 901                                                   - 1) >> sb->s_blocksize_bits);
 902                                         brelse(bh);
 903                                         break;
 904                                 }
 905                                 case TAG_IDENT_FSD:
 906                                         *fileset = newfileset;
 907                                         break;
 908                                 default:
 909                                         newfileset.logicalBlockNum++;
 910                                         brelse(bh);
 911                                         bh = NULL;
 912                                         break;
 913                                 }
 914                         } while (newfileset.logicalBlockNum < lastblock &&
 915                                  fileset->logicalBlockNum == 0xFFFFFFFF &&
 916                                  fileset->partitionReferenceNum == 0xFFFF);
 917                 }
 918         }
 919
 920         if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
 921              fileset->partitionReferenceNum != 0xFFFF) && bh) {
 922                 udf_debug("Fileset at block=%d, partition=%d\n",
 923                           fileset->logicalBlockNum,
 924                           fileset->partitionReferenceNum);
 925
 926                 sbi->s_partition = fileset->partitionReferenceNum;
 927                 udf_load_fileset(sb, bh, root);
 928                 brelse(bh);
 929                 return 0;
 930         }
 931         return 1;
 932 }
 933
 934 static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
 935 {
 936         struct primaryVolDesc *pvoldesc;
 937         struct ustr instr;
 938         struct ustr outstr;
 939         struct buffer_head *bh;
 940         uint16_t ident;
 941
 942         bh = udf_read_tagged(sb, block, block, &ident);
 943         if (!bh)
 944                 return 1;
 945         BUG_ON(ident != TAG_IDENT_PVD);
 946
 947         pvoldesc = (struct primaryVolDesc *)bh->b_data;
 948
 949         if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
 950                               pvoldesc->recordingDateAndTime)) {
 951 #ifdef UDFFS_DEBUG
 952                 timestamp *ts = &pvoldesc->recordingDateAndTime;
 953                 udf_debug("recording time %04u/%02u/%02u"
 954                           " %02u:%02u (%x)\n",
 955                           le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
 956                           ts->minute, le16_to_cpu(ts->typeAndTimezone));
 957 #endif
 958         }
 959
 960         if (!udf_build_ustr(&instr, pvoldesc->volIdent, 32))
 961                 if (udf_CS0toUTF8(&outstr, &instr)) {
 962                         strncpy(UDF_SB(sb)->s_volume_ident, outstr.u_name,
 963                                 outstr.u_len > 31 ? 31 : outstr.u_len);
 964                         udf_debug("volIdent[] = '%s'\n",
 965                                         UDF_SB(sb)->s_volume_ident);
 966                 }
 967
 968         if (!udf_build_ustr(&instr, pvoldesc->volSetIdent, 128))
 969                 if (udf_CS0toUTF8(&outstr, &instr))
 970                         udf_debug("volSetIdent[] = '%s'\n", outstr.u_name);
 971
 972         brelse(bh);
 973         return 0;
 974 }
 975
 976 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
 977                              kernel_lb_addr *root)
 978 {
 979         struct fileSetDesc *fset;
 980
 981         fset = (struct fileSetDesc *)bh->b_data;
 982
 983         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
 984
 985         UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
 986
 987         udf_debug("Rootdir at block=%d, partition=%d\n",
 988                   root->logicalBlockNum, root->partitionReferenceNum);
 989 }
 990
 991 int udf_compute_nr_groups(struct super_block *sb, u32 partition)
 992 {
 993         struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
 994         return DIV_ROUND_UP(map->s_partition_len +
 995                             (sizeof(struct spaceBitmapDesc) << 3),
 996                             sb->s_blocksize * 8);
 997 }
 998
 999 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
1000 {
1001         struct udf_bitmap *bitmap;
1002         int nr_groups;
1003         int size;
1004
1005         nr_groups = udf_compute_nr_groups(sb, index);
1006         size = sizeof(struct udf_bitmap) +
1007                 (sizeof(struct buffer_head *) * nr_groups);
1008
1009         if (size <= PAGE_SIZE)
1010                 bitmap = kmalloc(size, GFP_KERNEL);
1011         else
1012                 bitmap = vmalloc(size); /* TODO: get rid of vmalloc */
1013
1014         if (bitmap == NULL) {
1015                 udf_error(sb, __FUNCTION__,
1016                           "Unable to allocate space for bitmap "
1017                           "and %d buffer_head pointers", nr_groups);
1018                 return NULL;
1019         }
1020
1021         memset(bitmap, 0x00, size);
1022         bitmap->s_block_bitmap = (struct buffer_head **)(bitmap + 1);
1023         bitmap->s_nr_groups = nr_groups;
1024         return bitmap;
1025 }
1026
1027 static int udf_load_partdesc(struct super_block *sb, sector_t block)
1028 {
1029         struct buffer_head *bh;
1030         struct partitionHeaderDesc *phd;
1031         struct partitionDesc *p;
1032         struct udf_part_map *map;
1033         struct udf_sb_info *sbi = UDF_SB(sb);
1034         bool found = false;
1035         int i;
1036         uint16_t partitionNumber;
1037         uint16_t ident;
1038         int ret = 0;
1039
1040         bh = udf_read_tagged(sb, block, block, &ident);
1041         if (!bh)
1042                 return 1;
1043         if (ident != TAG_IDENT_PD)
1044                 goto out_bh;
1045
1046         p = (struct partitionDesc *)bh->b_data;
1047         partitionNumber = le16_to_cpu(p->partitionNumber);
1048         for (i = 0; i < sbi->s_partitions; i++) {
1049                 map = &sbi->s_partmaps[i];
1050                 udf_debug("Searching map: (%d == %d)\n",
1051                           map->s_partition_num, partitionNumber);
1052                 found = map->s_partition_num == partitionNumber;
1053                 if (found)
1054                         break;
1055         }
1056
1057         if (!found) {
1058                 udf_debug("Partition (%d) not found in partition map\n",
1059                           partitionNumber);
1060                 goto out_bh;
1061         }
1062
1063         map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
1064         map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
1065
1066         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
1067                 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
1068         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
1069                 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
1070         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
1071                 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
1072         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
1073                 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
1074
1075         udf_debug("Partition (%d:%d type %x) starts at physical %d, "
1076                   "block length %d\n", partitionNumber, i,
1077                   map->s_partition_type, map->s_partition_root,
1078                   map->s_partition_len);
1079
1080         if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1081             strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
1082                 goto out_bh;
1083
1084         phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1085         if (phd->unallocSpaceTable.extLength) {
1086                 kernel_lb_addr loc = {
1087                         .logicalBlockNum = le32_to_cpu(
1088                                 phd->unallocSpaceTable.extPosition),
1089                         .partitionReferenceNum = i,
1090                 };
1091
1092                 map->s_uspace.s_table = udf_iget(sb, loc);
1093                 if (!map->s_uspace.s_table) {
1094                         udf_debug("cannot load unallocSpaceTable (part %d)\n",
1095                                         i);
1096                         ret = 1;
1097                         goto out_bh;
1098                 }
1099                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1100                 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
1101                                 i, map->s_uspace.s_table->i_ino);
1102         }
1103
1104         if (phd->unallocSpaceBitmap.extLength) {
1105                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, i);
1106                 map->s_uspace.s_bitmap = bitmap;
1107                 if (bitmap != NULL) {
1108                         bitmap->s_extLength = le32_to_cpu(
1109                                 phd->unallocSpaceBitmap.extLength);
1110                         bitmap->s_extPosition = le32_to_cpu(
1111                                 phd->unallocSpaceBitmap.extPosition);
1112                         map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1113                         udf_debug("unallocSpaceBitmap (part %d) @ %d\n",
1114                                         i, bitmap->s_extPosition);
1115                 }
1116         }
1117
1118         if (phd->partitionIntegrityTable.extLength)
1119                 udf_debug("partitionIntegrityTable (part %d)\n", i);
1120
1121         if (phd->freedSpaceTable.extLength) {
1122                 kernel_lb_addr loc = {
1123                         .logicalBlockNum = le32_to_cpu(
1124                                 phd->freedSpaceTable.extPosition),
1125                         .partitionReferenceNum = i,
1126                 };
1127
1128                 map->s_fspace.s_table = udf_iget(sb, loc);
1129                 if (!map->s_fspace.s_table) {
1130                         udf_debug("cannot load freedSpaceTable (part %d)\n", i);
1131                         ret = 1;
1132                         goto out_bh;
1133                 }
1134
1135                 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
1136                 udf_debug("freedSpaceTable (part %d) @ %ld\n",
1137                                 i, map->s_fspace.s_table->i_ino);
1138         }
1139
1140         if (phd->freedSpaceBitmap.extLength) {
1141                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, i);
1142                 map->s_fspace.s_bitmap = bitmap;
1143                 if (bitmap != NULL) {
1144                         bitmap->s_extLength = le32_to_cpu(
1145                                 phd->freedSpaceBitmap.extLength);
1146                         bitmap->s_extPosition = le32_to_cpu(
1147                                 phd->freedSpaceBitmap.extPosition);
1148                         map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1149                         udf_debug("freedSpaceBitmap (part %d) @ %d\n",
1150                                         i, bitmap->s_extPosition);
1151                 }
1152         }
1153
1154 out_bh:
1155         brelse(bh);
1156         return ret;
1157 }
1158
1159 static int udf_load_logicalvol(struct super_block *sb, sector_t block,
1160                                kernel_lb_addr *fileset)
1161 {
1162         struct logicalVolDesc *lvd;
1163         int i, j, offset;
1164         uint8_t type;
1165         struct udf_sb_info *sbi = UDF_SB(sb);
1166         struct genericPartitionMap *gpm;
1167         uint16_t ident;
1168         struct buffer_head *bh;
1169         int ret = 0;
1170
1171         bh = udf_read_tagged(sb, block, block, &ident);
1172         if (!bh)
1173                 return 1;
1174         BUG_ON(ident != TAG_IDENT_LVD);
1175         lvd = (struct logicalVolDesc *)bh->b_data;
1176
1177         i = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1178         if (i != 0) {
1179                 ret = i;
1180                 goto out_bh;
1181         }
1182
1183         for (i = 0, offset = 0;
1184              i < sbi->s_partitions && offset < le32_to_cpu(lvd->mapTableLength);
1185              i++, offset += gpm->partitionMapLength) {
1186                 struct udf_part_map *map = &sbi->s_partmaps[i];
1187                 gpm = (struct genericPartitionMap *)
1188                                 &(lvd->partitionMaps[offset]);
1189                 type = gpm->partitionMapType;
1190                 if (type == 1) {
1191                         struct genericPartitionMap1 *gpm1 =
1192                                 (struct genericPartitionMap1 *)gpm;
1193                         map->s_partition_type = UDF_TYPE1_MAP15;
1194                         map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1195                         map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1196                         map->s_partition_func = NULL;
1197                 } else if (type == 2) {
1198                         struct udfPartitionMap2 *upm2 =
1199                                                 (struct udfPartitionMap2 *)gpm;
1200                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1201                                                 strlen(UDF_ID_VIRTUAL))) {
1202                                 u16 suf =
1203                                         le16_to_cpu(((__le16 *)upm2->partIdent.
1204                                                         identSuffix)[0]);
1205                                 if (suf == 0x0150) {
1206                                         map->s_partition_type =
1207                                                         UDF_VIRTUAL_MAP15;
1208                                         map->s_partition_func =
1209                                                         udf_get_pblock_virt15;
1210                                 } else if (suf == 0x0200) {
1211                                         map->s_partition_type =
1212                                                         UDF_VIRTUAL_MAP20;
1213                                         map->s_partition_func =
1214                                                         udf_get_pblock_virt20;
1215                                 }
1216                         } else if (!strncmp(upm2->partIdent.ident,
1217                                                 UDF_ID_SPARABLE,
1218                                                 strlen(UDF_ID_SPARABLE))) {
1219                                 uint32_t loc;
1220                                 struct sparingTable *st;
1221                                 struct sparablePartitionMap *spm =
1222                                         (struct sparablePartitionMap *)gpm;
1223
1224                                 map->s_partition_type = UDF_SPARABLE_MAP15;
1225                                 map->s_type_specific.s_sparing.s_packet_len =
1226                                                 le16_to_cpu(spm->packetLength);
1227                                 for (j = 0; j < spm->numSparingTables; j++) {
1228                                         struct buffer_head *bh2;
1229
1230                                         loc = le32_to_cpu(
1231                                                 spm->locSparingTable[j]);
1232                                         bh2 = udf_read_tagged(sb, loc, loc,
1233                                                              &ident);
1234                                         map->s_type_specific.s_sparing.
1235                                                         s_spar_map[j] = bh2;
1236
1237                                         if (bh2 == NULL)
1238                                                 continue;
1239
1240                                         st = (struct sparingTable *)bh2->b_data;
1241                                         if (ident != 0 || strncmp(
1242                                                 st->sparingIdent.ident,
1243                                                 UDF_ID_SPARING,
1244                                                 strlen(UDF_ID_SPARING))) {
1245                                                 brelse(bh2);
1246                                                 map->s_type_specific.s_sparing.
1247                                                         s_spar_map[j] = NULL;
1248                                         }
1249                                 }
1250                                 map->s_partition_func = udf_get_pblock_spar15;
1251                         } else {
1252                                 udf_debug("Unknown ident: %s\n",
1253                                           upm2->partIdent.ident);
1254                                 continue;
1255                         }
1256                         map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1257                         map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1258                 }
1259                 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1260                           i, map->s_partition_num, type,
1261                           map->s_volumeseqnum);
1262         }
1263
1264         if (fileset) {
1265                 long_ad *la = (long_ad *)&(lvd->logicalVolContentsUse[0]);
1266
1267                 *fileset = lelb_to_cpu(la->extLocation);
1268                 udf_debug("FileSet found in LogicalVolDesc at block=%d, "
1269                           "partition=%d\n", fileset->logicalBlockNum,
1270                           fileset->partitionReferenceNum);
1271         }
1272         if (lvd->integritySeqExt.extLength)
1273                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1274
1275 out_bh:
1276         brelse(bh);
1277         return ret;
1278 }
1279
1280 /*
1281  * udf_load_logicalvolint
1282  *
1283  */
1284 static void udf_load_logicalvolint(struct super_block *sb, kernel_extent_ad loc)
1285 {
1286         struct buffer_head *bh = NULL;
1287         uint16_t ident;
1288         struct udf_sb_info *sbi = UDF_SB(sb);
1289         struct logicalVolIntegrityDesc *lvid;
1290
1291         while (loc.extLength > 0 &&
1292                (bh = udf_read_tagged(sb, loc.extLocation,
1293                                      loc.extLocation, &ident)) &&
1294                ident == TAG_IDENT_LVID) {
1295                 sbi->s_lvid_bh = bh;
1296                 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1297
1298                 if (lvid->nextIntegrityExt.extLength)
1299                         udf_load_logicalvolint(sb,
1300                                 leea_to_cpu(lvid->nextIntegrityExt));
1301
1302                 if (sbi->s_lvid_bh != bh)
1303                         brelse(bh);
1304                 loc.extLength -= sb->s_blocksize;
1305                 loc.extLocation++;
1306         }
1307         if (sbi->s_lvid_bh != bh)
1308                 brelse(bh);
1309 }
1310
1311 /*
1312  * udf_process_sequence
1313  *
1314  * PURPOSE
1315  *      Process a main/reserve volume descriptor sequence.
1316  *
1317  * PRE-CONDITIONS
1318  *      sb                      Pointer to _locked_ superblock.
1319  *      block                   First block of first extent of the sequence.
1320  *      lastblock               Lastblock of first extent of the sequence.
1321  *
1322  * HISTORY
1323  *      July 1, 1997 - Andrew E. Mileski
1324  *      Written, tested, and released.
1325  */
1326 static noinline int udf_process_sequence(struct super_block *sb, long block,
1327                                 long lastblock, kernel_lb_addr *fileset)
1328 {
1329         struct buffer_head *bh = NULL;
1330         struct udf_vds_record vds[VDS_POS_LENGTH];
1331         struct udf_vds_record *curr;
1332         struct generic_desc *gd;
1333         struct volDescPtr *vdp;
1334         int done = 0;
1335         uint32_t vdsn;
1336         uint16_t ident;
1337         long next_s = 0, next_e = 0;
1338
1339         memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1340
1341         /*
1342          * Read the main descriptor sequence and find which descriptors
1343          * are in it.
1344          */
1345         for (; (!done && block <= lastblock); block++) {
1346
1347                 bh = udf_read_tagged(sb, block, block, &ident);
1348                 if (!bh) {
1349                         printk(KERN_ERR "udf: Block %Lu of volume descriptor "
1350                                "sequence is corrupted or we could not read "
1351                                "it.\n", (unsigned long long)block);
1352                         return 1;
1353                 }
1354
1355                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1356                 gd = (struct generic_desc *)bh->b_data;
1357                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1358                 switch (ident) {
1359                 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1360                         curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1361                         if (vdsn >= curr->volDescSeqNum) {
1362                                 curr->volDescSeqNum = vdsn;
1363                                 curr->block = block;
1364                         }
1365                         break;
1366                 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1367                         curr = &vds[VDS_POS_VOL_DESC_PTR];
1368                         if (vdsn >= curr->volDescSeqNum) {
1369                                 curr->volDescSeqNum = vdsn;
1370                                 curr->block = block;
1371
1372                                 vdp = (struct volDescPtr *)bh->b_data;
1373                                 next_s = le32_to_cpu(
1374                                         vdp->nextVolDescSeqExt.extLocation);
1375                                 next_e = le32_to_cpu(
1376                                         vdp->nextVolDescSeqExt.extLength);
1377                                 next_e = next_e >> sb->s_blocksize_bits;
1378                                 next_e += next_s;
1379                         }
1380                         break;
1381                 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1382                         curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1383                         if (vdsn >= curr->volDescSeqNum) {
1384                                 curr->volDescSeqNum = vdsn;
1385                                 curr->block = block;
1386                         }
1387                         break;
1388                 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1389                         curr = &vds[VDS_POS_PARTITION_DESC];
1390                         if (!curr->block)
1391                                 curr->block = block;
1392                         break;
1393                 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1394                         curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1395                         if (vdsn >= curr->volDescSeqNum) {
1396                                 curr->volDescSeqNum = vdsn;
1397                                 curr->block = block;
1398                         }
1399                         break;
1400                 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1401                         curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1402                         if (vdsn >= curr->volDescSeqNum) {
1403                                 curr->volDescSeqNum = vdsn;
1404                                 curr->block = block;
1405                         }
1406                         break;
1407                 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1408                         vds[VDS_POS_TERMINATING_DESC].block = block;
1409                         if (next_e) {
1410                                 block = next_s;
1411                                 lastblock = next_e;
1412                                 next_s = next_e = 0;
1413                         } else
1414                                 done = 1;
1415                         break;
1416                 }
1417                 brelse(bh);
1418         }
1419         /*
1420          * Now read interesting descriptors again and process them
1421          * in a suitable order
1422          */
1423         if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1424                 printk(KERN_ERR "udf: Primary Volume Descriptor not found!\n");
1425                 return 1;
1426         }
1427         if (udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block))
1428                 return 1;
1429
1430         if (vds[VDS_POS_LOGICAL_VOL_DESC].block && udf_load_logicalvol(sb,
1431             vds[VDS_POS_LOGICAL_VOL_DESC].block, fileset))
1432                 return 1;
1433
1434         if (vds[VDS_POS_PARTITION_DESC].block) {
1435                 /*
1436                  * We rescan the whole descriptor sequence to find
1437                  * partition descriptor blocks and process them.
1438                  */
1439                 for (block = vds[VDS_POS_PARTITION_DESC].block;
1440                      block < vds[VDS_POS_TERMINATING_DESC].block;
1441                      block++)
1442                         if (udf_load_partdesc(sb, block))
1443                                 return 1;
1444         }
1445
1446         return 0;
1447 }
1448
1449 /*
1450  * udf_check_valid()
1451  */
1452 static int udf_check_valid(struct super_block *sb, int novrs, int silent)
1453 {
1454         long block;
1455         struct udf_sb_info *sbi = UDF_SB(sb);
1456
1457         if (novrs) {
1458                 udf_debug("Validity check skipped because of novrs option\n");
1459                 return 0;
1460         }
1461         /* Check that it is NSR02 compliant */
1462         /* Process any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
1463         block = udf_vrs(sb, silent);
1464         if (block == -1)
1465                 udf_debug("Failed to read byte 32768. Assuming open "
1466                           "disc. Skipping validity check\n");
1467         if (block && !sbi->s_last_block)
1468                 sbi->s_last_block = udf_get_last_block(sb);
1469         return !block;
1470 }
1471
1472 static int udf_load_partition(struct super_block *sb, kernel_lb_addr *fileset)
1473 {
1474         struct anchorVolDescPtr *anchor;
1475         uint16_t ident;
1476         struct buffer_head *bh;
1477         long main_s, main_e, reserve_s, reserve_e;
1478         int i, j;
1479         struct udf_sb_info *sbi;
1480
1481         if (!sb)
1482                 return 1;
1483         sbi = UDF_SB(sb);
1484
1485         for (i = 0; i < ARRAY_SIZE(sbi->s_anchor); i++) {
1486                 if (!sbi->s_anchor[i])
1487                         continue;
1488
1489                 bh = udf_read_tagged(sb, sbi->s_anchor[i], sbi->s_anchor[i],
1490                                      &ident);
1491                 if (!bh)
1492                         continue;
1493
1494                 anchor = (struct anchorVolDescPtr *)bh->b_data;
1495
1496                 /* Locate the main sequence */
1497                 main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1498                 main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1499                 main_e = main_e >> sb->s_blocksize_bits;
1500                 main_e += main_s;
1501
1502                 /* Locate the reserve sequence */
1503                 reserve_s = le32_to_cpu(
1504                                 anchor->reserveVolDescSeqExt.extLocation);
1505                 reserve_e = le32_to_cpu(
1506                                 anchor->reserveVolDescSeqExt.extLength);
1507                 reserve_e = reserve_e >> sb->s_blocksize_bits;
1508                 reserve_e += reserve_s;
1509
1510                 brelse(bh);
1511
1512                 /* Process the main & reserve sequences */
1513                 /* responsible for finding the PartitionDesc(s) */
1514                 if (!(udf_process_sequence(sb, main_s, main_e,
1515                                            fileset) &&
1516                       udf_process_sequence(sb, reserve_s, reserve_e,
1517                                            fileset)))
1518                         break;
1519         }
1520
1521         if (i == ARRAY_SIZE(sbi->s_anchor)) {
1522                 udf_debug("No Anchor block found\n");
1523                 return 1;
1524         }
1525         udf_debug("Using anchor in block %d\n", sbi->s_anchor[i]);
1526
1527         for (i = 0; i < sbi->s_partitions; i++) {
1528                 kernel_lb_addr uninitialized_var(ino);
1529                 struct udf_part_map *map = &sbi->s_partmaps[i];
1530
1531                 if (map->s_partition_type != UDF_VIRTUAL_MAP15 &&
1532                         map->s_partition_type != UDF_VIRTUAL_MAP20)
1533                         continue;
1534
1535                 if (!sbi->s_last_block) {
1536                         sbi->s_last_block = udf_get_last_block(sb);
1537                         udf_find_anchor(sb);
1538                 }
1539
1540                 if (!sbi->s_last_block) {
1541                         udf_debug("Unable to determine Lastblock (For "
1542                                         "Virtual Partition)\n");
1543                         return 1;
1544                 }
1545
1546                 for (j = 0; j < sbi->s_partitions; j++) {
1547                         struct udf_part_map *map2 = &sbi->s_partmaps[j];
1548                         if (j != i &&
1549                                 map->s_volumeseqnum ==
1550                                         map2->s_volumeseqnum &&
1551                                 map->s_partition_num ==
1552                                         map2->s_partition_num) {
1553                                 ino.partitionReferenceNum = j;
1554                                 ino.logicalBlockNum =
1555                                         sbi->s_last_block -
1556                                                 map2->s_partition_root;
1557                                 break;
1558                         }
1559                 }
1560
1561                 if (j == sbi->s_partitions)
1562                         return 1;
1563
1564                 sbi->s_vat_inode = udf_iget(sb, ino);
1565                 if (!sbi->s_vat_inode)
1566                         return 1;
1567
1568                 if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1569                         map->s_type_specific.s_virtual.s_start_offset =
1570                                 udf_ext0_offset(sbi->s_vat_inode);
1571                         map->s_type_specific.s_virtual.s_num_entries =
1572                                 (sbi->s_vat_inode->i_size - 36) >> 2;
1573                 } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1574                         uint32_t pos;
1575                         struct virtualAllocationTable20 *vat20;
1576
1577                         pos = udf_block_map(sbi->s_vat_inode, 0);
1578                         bh = sb_bread(sb, pos);
1579                         if (!bh)
1580                                 return 1;
1581                         vat20 = (struct virtualAllocationTable20 *)
1582                                 bh->b_data +
1583                                 udf_ext0_offset(sbi->s_vat_inode);
1584                         map->s_type_specific.s_virtual.s_start_offset =
1585                                 le16_to_cpu(vat20->lengthHeader) +
1586                                 udf_ext0_offset(sbi->s_vat_inode);
1587                         map->s_type_specific.s_virtual.s_num_entries =
1588                                 (sbi->s_vat_inode->i_size -
1589                                         map->s_type_specific.s_virtual.
1590                                                 s_start_offset) >> 2;
1591                         brelse(bh);
1592                 }
1593                 map->s_partition_root = udf_get_pblock(sb, 0, i, 0);
1594                 map->s_partition_len =
1595                         sbi->s_partmaps[ino.partitionReferenceNum].
1596                                                         s_partition_len;
1597         }
1598         return 0;
1599 }
1600
1601 static void udf_open_lvid(struct super_block *sb)
1602 {
1603         struct udf_sb_info *sbi = UDF_SB(sb);
1604         struct buffer_head *bh = sbi->s_lvid_bh;
1605         struct logicalVolIntegrityDesc *lvid;
1606         struct logicalVolIntegrityDescImpUse *lvidiu;
1607         if (!bh)
1608                 return;
1609
1610         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1611         lvidiu = udf_sb_lvidiu(sbi);
1612
1613         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1614         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1615         udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
1616                                 CURRENT_TIME);
1617         lvid->integrityType = LVID_INTEGRITY_TYPE_OPEN;
1618
1619         lvid->descTag.descCRC = cpu_to_le16(
1620                 udf_crc((char *)lvid + sizeof(tag),
1621                         le16_to_cpu(lvid->descTag.descCRCLength), 0));
1622
1623         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1624         mark_buffer_dirty(bh);
1625 }
1626
1627 static void udf_close_lvid(struct super_block *sb)
1628 {
1629         struct udf_sb_info *sbi = UDF_SB(sb);
1630         struct buffer_head *bh = sbi->s_lvid_bh;
1631         struct logicalVolIntegrityDesc *lvid;
1632         struct logicalVolIntegrityDescImpUse *lvidiu;
1633
1634         if (!bh)
1635                 return;
1636
1637         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1638
1639         if (lvid->integrityType != LVID_INTEGRITY_TYPE_OPEN)
1640                 return;
1641
1642         lvidiu = udf_sb_lvidiu(sbi);
1643         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1644         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1645         udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
1646         if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1647                 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1648         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1649                 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1650         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
1651                 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
1652         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1653
1654         lvid->descTag.descCRC = cpu_to_le16(
1655                 udf_crc((char *)lvid + sizeof(tag),
1656                         le16_to_cpu(lvid->descTag.descCRCLength),
1657                         0));
1658
1659         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1660         mark_buffer_dirty(bh);
1661 }
1662
1663 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
1664 {
1665         int i;
1666         int nr_groups = bitmap->s_nr_groups;
1667         int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
1668                                                 nr_groups);
1669
1670         for (i = 0; i < nr_groups; i++)
1671                 if (bitmap->s_block_bitmap[i])
1672                         brelse(bitmap->s_block_bitmap[i]);
1673
1674         if (size <= PAGE_SIZE)
1675                 kfree(bitmap);
1676         else
1677                 vfree(bitmap);
1678 }
1679
1680 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1681 {
1682         int i;
1683         struct inode *inode = NULL;
1684         struct udf_options uopt;
1685         kernel_lb_addr rootdir, fileset;
1686         struct udf_sb_info *sbi;
1687
1688         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1689         uopt.uid = -1;
1690         uopt.gid = -1;
1691         uopt.umask = 0;
1692
1693         sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1694         if (!sbi)
1695                 return -ENOMEM;
1696
1697         sb->s_fs_info = sbi;
1698
1699         mutex_init(&sbi->s_alloc_mutex);
1700
1701         if (!udf_parse_options((char *)options, &uopt, false))
1702                 goto error_out;
1703
1704         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1705             uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
1706                 udf_error(sb, "udf_read_super",
1707                           "utf8 cannot be combined with iocharset\n");
1708                 goto error_out;
1709         }
1710 #ifdef CONFIG_UDF_NLS
1711         if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1712                 uopt.nls_map = load_nls_default();
1713                 if (!uopt.nls_map)
1714                         uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1715                 else
1716                         udf_debug("Using default NLS map\n");
1717         }
1718 #endif
1719         if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1720                 uopt.flags |= (1 << UDF_FLAG_UTF8);
1721
1722         fileset.logicalBlockNum = 0xFFFFFFFF;
1723         fileset.partitionReferenceNum = 0xFFFF;
1724
1725         sbi->s_flags = uopt.flags;
1726         sbi->s_uid = uopt.uid;
1727         sbi->s_gid = uopt.gid;
1728         sbi->s_umask = uopt.umask;
1729         sbi->s_nls_map = uopt.nls_map;
1730
1731         /* Set the block size for all transfers */
1732         if (!sb_min_blocksize(sb, uopt.blocksize)) {
1733                 udf_debug("Bad block size (%d)\n", uopt.blocksize);
1734                 printk(KERN_ERR "udf: bad block size (%d)\n", uopt.blocksize);
1735                 goto error_out;
1736         }
1737
1738         if (uopt.session == 0xFFFFFFFF)
1739                 sbi->s_session = udf_get_last_session(sb);
1740         else
1741                 sbi->s_session = uopt.session;
1742
1743         udf_debug("Multi-session=%d\n", sbi->s_session);
1744
1745         sbi->s_last_block = uopt.lastblock;
1746         sbi->s_anchor[0] = sbi->s_anchor[1] = 0;
1747         sbi->s_anchor[2] = uopt.anchor;
1748         sbi->s_anchor[3] = 256;
1749
1750         if (udf_check_valid(sb, uopt.novrs, silent)) {
1751                 /* read volume recognition sequences */
1752                 printk(KERN_WARNING "UDF-fs: No VRS found\n");
1753                 goto error_out;
1754         }
1755
1756         udf_find_anchor(sb);
1757
1758         /* Fill in the rest of the superblock */
1759         sb->s_op = &udf_sb_ops;
1760         sb->dq_op = NULL;
1761         sb->s_dirt = 0;
1762         sb->s_magic = UDF_SUPER_MAGIC;
1763         sb->s_time_gran = 1000;
1764
1765         if (udf_load_partition(sb, &fileset)) {
1766                 printk(KERN_WARNING "UDF-fs: No partition found (1)\n");
1767                 goto error_out;
1768         }
1769
1770         udf_debug("Lastblock=%d\n", sbi->s_last_block);
1771
1772         if (sbi->s_lvid_bh) {
1773                 struct logicalVolIntegrityDescImpUse *lvidiu =
1774                                                         udf_sb_lvidiu(sbi);
1775                 uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
1776                 uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
1777                 /* uint16_t maxUDFWriteRev =
1778                                 le16_to_cpu(lvidiu->maxUDFWriteRev); */
1779
1780                 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
1781                         printk(KERN_ERR "UDF-fs: minUDFReadRev=%x "
1782                                         "(max is %x)\n",
1783                                le16_to_cpu(lvidiu->minUDFReadRev),
1784                                UDF_MAX_READ_VERSION);
1785                         goto error_out;
1786                 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
1787                         sb->s_flags |= MS_RDONLY;
1788
1789                 sbi->s_udfrev = minUDFWriteRev;
1790
1791                 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1792                         UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
1793                 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
1794                         UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
1795         }
1796
1797         if (!sbi->s_partitions) {
1798                 printk(KERN_WARNING "UDF-fs: No partition found (2)\n");
1799                 goto error_out;
1800         }
1801
1802         if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
1803                         UDF_PART_FLAG_READ_ONLY) {
1804                 printk(KERN_NOTICE "UDF-fs: Partition marked readonly; "
1805                                    "forcing readonly mount\n");
1806                 sb->s_flags |= MS_RDONLY;
1807         }
1808
1809         if (udf_find_fileset(sb, &fileset, &rootdir)) {
1810                 printk(KERN_WARNING "UDF-fs: No fileset found\n");
1811                 goto error_out;
1812         }
1813
1814         if (!silent) {
1815                 timestamp ts;
1816                 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
1817                 udf_info("UDF: Mounting volume '%s', "
1818                          "timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
1819                          sbi->s_volume_ident, le16_to_cpu(ts.year), ts.month, ts.day,
1820                          ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
1821         }
1822         if (!(sb->s_flags & MS_RDONLY))
1823                 udf_open_lvid(sb);
1824
1825         /* Assign the root inode */
1826         /* assign inodes by physical block number */
1827         /* perhaps it's not extensible enough, but for now ... */
1828         inode = udf_iget(sb, rootdir);
1829         if (!inode) {
1830                 printk(KERN_ERR "UDF-fs: Error in udf_iget, block=%d, "
1831                                 "partition=%d\n",
1832                        rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
1833                 goto error_out;
1834         }
1835
1836         /* Allocate a dentry for the root inode */
1837         sb->s_root = d_alloc_root(inode);
1838         if (!sb->s_root) {
1839                 printk(KERN_ERR "UDF-fs: Couldn't allocate root dentry\n");
1840                 iput(inode);
1841                 goto error_out;
1842         }
1843         sb->s_maxbytes = MAX_LFS_FILESIZE;
1844         return 0;
1845
1846 error_out:
1847         if (sbi->s_vat_inode)
1848                 iput(sbi->s_vat_inode);
1849         if (sbi->s_partitions) {
1850                 struct udf_part_map *map = &sbi->s_partmaps[sbi->s_partition];
1851                 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1852                         iput(map->s_uspace.s_table);
1853                 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1854                         iput(map->s_fspace.s_table);
1855                 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1856                         udf_sb_free_bitmap(map->s_uspace.s_bitmap);
1857                 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1858                         udf_sb_free_bitmap(map->s_fspace.s_bitmap);
1859                 if (map->s_partition_type == UDF_SPARABLE_MAP15)
1860                         for (i = 0; i < 4; i++)
1861                                 brelse(map->s_type_specific.s_sparing.
1862                                                 s_spar_map[i]);
1863         }
1864 #ifdef CONFIG_UDF_NLS
1865         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1866                 unload_nls(sbi->s_nls_map);
1867 #endif
1868         if (!(sb->s_flags & MS_RDONLY))
1869                 udf_close_lvid(sb);
1870         brelse(sbi->s_lvid_bh);
1871
1872         kfree(sbi->s_partmaps);
1873         kfree(sbi);
1874         sb->s_fs_info = NULL;
1875
1876         return -EINVAL;
1877 }
1878
1879 static void udf_error(struct super_block *sb, const char *function,
1880                       const char *fmt, ...)
1881 {
1882         va_list args;
1883
1884         if (!(sb->s_flags & MS_RDONLY)) {
1885                 /* mark sb error */
1886                 sb->s_dirt = 1;
1887         }
1888         va_start(args, fmt);
1889         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1890         va_end(args);
1891         printk(KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
1892                 sb->s_id, function, error_buf);
1893 }
1894
1895 void udf_warning(struct super_block *sb, const char *function,
1896                  const char *fmt, ...)
1897 {
1898         va_list args;
1899
1900         va_start(args, fmt);
1901         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1902         va_end(args);
1903         printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
1904                sb->s_id, function, error_buf);
1905 }
1906
1907 static void udf_put_super(struct super_block *sb)
1908 {
1909         int i;
1910         struct udf_sb_info *sbi;
1911
1912         sbi = UDF_SB(sb);
1913         if (sbi->s_vat_inode)
1914                 iput(sbi->s_vat_inode);
1915         if (sbi->s_partitions) {
1916                 struct udf_part_map *map = &sbi->s_partmaps[sbi->s_partition];
1917                 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1918                         iput(map->s_uspace.s_table);
1919                 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1920                         iput(map->s_fspace.s_table);
1921                 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1922                         udf_sb_free_bitmap(map->s_uspace.s_bitmap);
1923                 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1924                         udf_sb_free_bitmap(map->s_fspace.s_bitmap);
1925                 if (map->s_partition_type == UDF_SPARABLE_MAP15)
1926                         for (i = 0; i < 4; i++)
1927                                 brelse(map->s_type_specific.s_sparing.
1928                                                 s_spar_map[i]);
1929         }
1930 #ifdef CONFIG_UDF_NLS
1931         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1932                 unload_nls(sbi->s_nls_map);
1933 #endif
1934         if (!(sb->s_flags & MS_RDONLY))
1935                 udf_close_lvid(sb);
1936         brelse(sbi->s_lvid_bh);
1937         kfree(sbi->s_partmaps);
1938         kfree(sb->s_fs_info);
1939         sb->s_fs_info = NULL;
1940 }
1941
1942 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
1943 {
1944         struct super_block *sb = dentry->d_sb;
1945         struct udf_sb_info *sbi = UDF_SB(sb);
1946         struct logicalVolIntegrityDescImpUse *lvidiu;
1947
1948         if (sbi->s_lvid_bh != NULL)
1949                 lvidiu = udf_sb_lvidiu(sbi);
1950         else
1951                 lvidiu = NULL;
1952
1953         buf->f_type = UDF_SUPER_MAGIC;
1954         buf->f_bsize = sb->s_blocksize;
1955         buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
1956         buf->f_bfree = udf_count_free(sb);
1957         buf->f_bavail = buf->f_bfree;
1958         buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
1959                                           le32_to_cpu(lvidiu->numDirs)) : 0)
1960                         + buf->f_bfree;
1961         buf->f_ffree = buf->f_bfree;
1962         /* __kernel_fsid_t f_fsid */
1963         buf->f_namelen = UDF_NAME_LEN - 2;
1964
1965         return 0;
1966 }
1967
1968 static unsigned int udf_count_free_bitmap(struct super_block *sb,
1969                                           struct udf_bitmap *bitmap)
1970 {
1971         struct buffer_head *bh = NULL;
1972         unsigned int accum = 0;
1973         int index;
1974         int block = 0, newblock;
1975         kernel_lb_addr loc;
1976         uint32_t bytes;
1977         uint8_t *ptr;
1978         uint16_t ident;
1979         struct spaceBitmapDesc *bm;
1980
1981         lock_kernel();
1982
1983         loc.logicalBlockNum = bitmap->s_extPosition;
1984         loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
1985         bh = udf_read_ptagged(sb, loc, 0, &ident);
1986
1987         if (!bh) {
1988                 printk(KERN_ERR "udf: udf_count_free failed\n");
1989                 goto out;
1990         } else if (ident != TAG_IDENT_SBD) {
1991                 brelse(bh);
1992                 printk(KERN_ERR "udf: udf_count_free failed\n");
1993                 goto out;
1994         }
1995
1996         bm = (struct spaceBitmapDesc *)bh->b_data;
1997         bytes = le32_to_cpu(bm->numOfBytes);
1998         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
1999         ptr = (uint8_t *)bh->b_data;
2000
2001         while (bytes > 0) {
2002                 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2003                 accum += bitmap_weight((const unsigned long *)(ptr + index),
2004                                         cur_bytes * 8);
2005                 bytes -= cur_bytes;
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 }