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