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                   (sector >> sb->s_blocksize_bits), sb->s_blocksize);
 612         /* Process the sequence (if applicable) */
 613         for (; !nsr02 && !nsr03; sector += sectorsize) {
 614                 /* Read a block */
 615                 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
 616                 if (!bh)
 617                         break;
 618
 619                 /* Look for ISO  descriptors */
 620                 vsd = (struct volStructDesc *)(bh->b_data +
 621                                               (sector & (sb->s_blocksize - 1)));
 622
 623                 if (vsd->stdIdent[0] == 0) {
 624                         brelse(bh);
 625                         break;
 626                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
 627                                     VSD_STD_ID_LEN)) {
 628                         iso9660 = sector;
 629                         switch (vsd->structType) {
 630                         case 0:
 631                                 udf_debug("ISO9660 Boot Record found\n");
 632                                 break;
 633                         case 1:
 634                                 udf_debug("ISO9660 Primary Volume Descriptor "
 635                                           "found\n");
 636                                 break;
 637                         case 2:
 638                                 udf_debug("ISO9660 Supplementary Volume "
 639                                           "Descriptor found\n");
 640                                 break;
 641                         case 3:
 642                                 udf_debug("ISO9660 Volume Partition Descriptor "
 643                                           "found\n");
 644                                 break;
 645                         case 255:
 646                                 udf_debug("ISO9660 Volume Descriptor Set "
 647                                           "Terminator found\n");
 648                                 break;
 649                         default:
 650                                 udf_debug("ISO9660 VRS (%u) found\n",
 651                                           vsd->structType);
 652                                 break;
 653                         }
 654                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
 655                                     VSD_STD_ID_LEN))
 656                         ; /* nothing */
 657                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
 658                                     VSD_STD_ID_LEN)) {
 659                         brelse(bh);
 660                         break;
 661                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
 662                                     VSD_STD_ID_LEN))
 663                         nsr02 = sector;
 664                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
 665                                     VSD_STD_ID_LEN))
 666                         nsr03 = sector;
 667                 brelse(bh);
 668         }
 669
 670         if (nsr03)
 671                 return nsr03;
 672         else if (nsr02)
 673                 return nsr02;
 674         else if (sector - (sbi->s_session << sb->s_blocksize_bits) == 32768)
 675                 return -1;
 676         else
 677                 return 0;
 678 }
 679
 680 /*
 681  * Check whether there is an anchor block in the given block
 682  */
 683 static int udf_check_anchor_block(struct super_block *sb, sector_t block,
 684                                         bool varconv)
 685 {
 686         struct buffer_head *bh = NULL;
 687         tag *t;
 688         uint16_t ident;
 689         uint32_t location;
 690
 691         if (varconv) {
 692                 if (udf_fixed_to_variable(block) >=
 693                     sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits)
 694                         return 0;
 695                 bh = sb_bread(sb, udf_fixed_to_variable(block));
 696         }
 697         else
 698                 bh = sb_bread(sb, block);
 699
 700         if (!bh)
 701                 return 0;
 702
 703         t = (tag *)bh->b_data;
 704         ident = le16_to_cpu(t->tagIdent);
 705         location = le32_to_cpu(t->tagLocation);
 706         brelse(bh);
 707         if (ident != TAG_IDENT_AVDP)
 708                 return 0;
 709         return location == block;
 710 }
 711
 712 /* Search for an anchor volume descriptor pointer */
 713 static sector_t udf_scan_anchors(struct super_block *sb, bool varconv,
 714                                         sector_t lastblock)
 715 {
 716         sector_t last[6];
 717         int i;
 718         struct udf_sb_info *sbi = UDF_SB(sb);
 719
 720         last[0] = lastblock;
 721         last[1] = last[0] - 1;
 722         last[2] = last[0] + 1;
 723         last[3] = last[0] - 2;
 724         last[4] = last[0] - 150;
 725         last[5] = last[0] - 152;
 726
 727         /*  according to spec, anchor is in either:
 728          *     block 256
 729          *     lastblock-256
 730          *     lastblock
 731          *  however, if the disc isn't closed, it could be 512 */
 732
 733         for (i = 0; i < ARRAY_SIZE(last); i++) {
 734                 if (last[i] < 0)
 735                         continue;
 736                 if (last[i] >= sb->s_bdev->bd_inode->i_size >>
 737                                 sb->s_blocksize_bits)
 738                         continue;
 739
 740                 if (udf_check_anchor_block(sb, last[i], varconv)) {
 741                         sbi->s_anchor[0] = last[i];
 742                         sbi->s_anchor[1] = last[i] - 256;
 743                         return last[i];
 744                 }
 745
 746                 if (last[i] < 256)
 747                         continue;
 748
 749                 if (udf_check_anchor_block(sb, last[i] - 256, varconv)) {
 750                         sbi->s_anchor[1] = last[i] - 256;
 751                         return last[i];
 752                 }
 753         }
 754
 755         if (udf_check_anchor_block(sb, sbi->s_session + 256, varconv)) {
 756                 sbi->s_anchor[0] = sbi->s_session + 256;
 757                 return last[0];
 758         }
 759         if (udf_check_anchor_block(sb, sbi->s_session + 512, varconv)) {
 760                 sbi->s_anchor[0] = sbi->s_session + 512;
 761                 return last[0];
 762         }
 763         return 0;
 764 }
 765
 766 /*
 767  * Find an anchor volume descriptor. The function expects sbi->s_lastblock to
 768  * be the last block on the media.
 769  *
 770  * Return 1 if not found, 0 if ok
 771  *
 772  */
 773 static void udf_find_anchor(struct super_block *sb)
 774 {
 775         sector_t lastblock;
 776         struct buffer_head *bh = NULL;
 777         uint16_t ident;
 778         int i;
 779         struct udf_sb_info *sbi = UDF_SB(sb);
 780
 781         lastblock = udf_scan_anchors(sb, 0, sbi->s_last_block);
 782         if (lastblock)
 783                 goto check_anchor;
 784
 785         /* No anchor found? Try VARCONV conversion of block numbers */
 786         /* Firstly, we try to not convert number of the last block */
 787         lastblock = udf_scan_anchors(sb, 1,
 788                                 udf_variable_to_fixed(sbi->s_last_block));
 789         if (lastblock) {
 790                 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
 791                 goto check_anchor;
 792         }
 793
 794         /* Secondly, we try with converted number of the last block */
 795         lastblock = udf_scan_anchors(sb, 1, sbi->s_last_block);
 796         if (lastblock)
 797                 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
 798
 799 check_anchor:
 800         /*
 801          * Check located anchors and the anchor block supplied via
 802          * mount options
 803          */
 804         for (i = 0; i < ARRAY_SIZE(sbi->s_anchor); i++) {
 805                 if (!sbi->s_anchor[i])
 806                         continue;
 807                 bh = udf_read_tagged(sb, sbi->s_anchor[i],
 808                                         sbi->s_anchor[i], &ident);
 809                 if (!bh)
 810                         sbi->s_anchor[i] = 0;
 811                 else {
 812                         brelse(bh);
 813                         if (ident != TAG_IDENT_AVDP)
 814                                 sbi->s_anchor[i] = 0;
 815                 }
 816         }
 817
 818         sbi->s_last_block = lastblock;
 819 }
 820
 821 static int udf_find_fileset(struct super_block *sb,
 822                             kernel_lb_addr *fileset,
 823                             kernel_lb_addr *root)
 824 {
 825         struct buffer_head *bh = NULL;
 826         long lastblock;
 827         uint16_t ident;
 828         struct udf_sb_info *sbi;
 829
 830         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
 831             fileset->partitionReferenceNum != 0xFFFF) {
 832                 bh = udf_read_ptagged(sb, *fileset, 0, &ident);
 833
 834                 if (!bh) {
 835                         return 1;
 836                 } else if (ident != TAG_IDENT_FSD) {
 837                         brelse(bh);
 838                         return 1;
 839                 }
 840
 841         }
 842
 843         sbi = UDF_SB(sb);
 844         if (!bh) {
 845                 /* Search backwards through the partitions */
 846                 kernel_lb_addr newfileset;
 847
 848 /* --> cvg: FIXME - is it reasonable? */
 849                 return 1;
 850
 851                 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
 852                      (newfileset.partitionReferenceNum != 0xFFFF &&
 853                       fileset->logicalBlockNum == 0xFFFFFFFF &&
 854                       fileset->partitionReferenceNum == 0xFFFF);
 855                      newfileset.partitionReferenceNum--) {
 856                         lastblock = sbi->s_partmaps
 857                                         [newfileset.partitionReferenceNum]
 858                                                 .s_partition_len;
 859                         newfileset.logicalBlockNum = 0;
 860
 861                         do {
 862                                 bh = udf_read_ptagged(sb, newfileset, 0,
 863                                                       &ident);
 864                                 if (!bh) {
 865                                         newfileset.logicalBlockNum++;
 866                                         continue;
 867                                 }
 868
 869                                 switch (ident) {
 870                                 case TAG_IDENT_SBD:
 871                                 {
 872                                         struct spaceBitmapDesc *sp;
 873                                         sp = (struct spaceBitmapDesc *)
 874                                                                 bh->b_data;
 875                                         newfileset.logicalBlockNum += 1 +
 876                                                 ((le32_to_cpu(sp->numOfBytes) +
 877                                                   sizeof(struct spaceBitmapDesc)
 878                                                   - 1) >> sb->s_blocksize_bits);
 879                                         brelse(bh);
 880                                         break;
 881                                 }
 882                                 case TAG_IDENT_FSD:
 883                                         *fileset = newfileset;
 884                                         break;
 885                                 default:
 886                                         newfileset.logicalBlockNum++;
 887                                         brelse(bh);
 888                                         bh = NULL;
 889                                         break;
 890                                 }
 891                         } while (newfileset.logicalBlockNum < lastblock &&
 892                                  fileset->logicalBlockNum == 0xFFFFFFFF &&
 893                                  fileset->partitionReferenceNum == 0xFFFF);
 894                 }
 895         }
 896
 897         if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
 898              fileset->partitionReferenceNum != 0xFFFF) && bh) {
 899                 udf_debug("Fileset at block=%d, partition=%d\n",
 900                           fileset->logicalBlockNum,
 901                           fileset->partitionReferenceNum);
 902
 903                 sbi->s_partition = fileset->partitionReferenceNum;
 904                 udf_load_fileset(sb, bh, root);
 905                 brelse(bh);
 906                 return 0;
 907         }
 908         return 1;
 909 }
 910
 911 static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
 912 {
 913         struct primaryVolDesc *pvoldesc;
 914         struct ustr instr;
 915         struct ustr outstr;
 916         struct buffer_head *bh;
 917         uint16_t ident;
 918
 919         bh = udf_read_tagged(sb, block, block, &ident);
 920         if (!bh)
 921                 return 1;
 922         BUG_ON(ident != TAG_IDENT_PVD);
 923
 924         pvoldesc = (struct primaryVolDesc *)bh->b_data;
 925
 926         if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
 927                               pvoldesc->recordingDateAndTime)) {
 928 #ifdef UDFFS_DEBUG
 929                 timestamp *ts = &pvoldesc->recordingDateAndTime;
 930                 udf_debug("recording time %04u/%02u/%02u"
 931                           " %02u:%02u (%x)\n",
 932                           le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
 933                           ts->minute, le16_to_cpu(ts->typeAndTimezone));
 934 #endif
 935         }
 936
 937         if (!udf_build_ustr(&instr, pvoldesc->volIdent, 32))
 938                 if (udf_CS0toUTF8(&outstr, &instr)) {
 939                         strncpy(UDF_SB(sb)->s_volume_ident, outstr.u_name,
 940                                 outstr.u_len > 31 ? 31 : outstr.u_len);
 941                         udf_debug("volIdent[] = '%s'\n",
 942                                         UDF_SB(sb)->s_volume_ident);
 943                 }
 944
 945         if (!udf_build_ustr(&instr, pvoldesc->volSetIdent, 128))
 946                 if (udf_CS0toUTF8(&outstr, &instr))
 947                         udf_debug("volSetIdent[] = '%s'\n", outstr.u_name);
 948
 949         brelse(bh);
 950         return 0;
 951 }
 952
 953 static int udf_load_metadata_files(struct super_block *sb, int partition)
 954 {
 955         struct udf_sb_info *sbi = UDF_SB(sb);
 956         struct udf_part_map *map;
 957         struct udf_meta_data *mdata;
 958         kernel_lb_addr addr;
 959         int fe_error = 0;
 960
 961         map = &sbi->s_partmaps[partition];
 962         mdata = &map->s_type_specific.s_metadata;
 963
 964         /* metadata address */
 965         addr.logicalBlockNum =  mdata->s_meta_file_loc;
 966         addr.partitionReferenceNum = map->s_partition_num;
 967
 968         udf_debug("Metadata file location: block = %d part = %d\n",
 969                           addr.logicalBlockNum, addr.partitionReferenceNum);
 970
 971         mdata->s_metadata_fe = udf_iget(sb, addr);
 972
 973         if (mdata->s_metadata_fe == NULL) {
 974                 udf_warning(sb, __func__, "metadata inode efe not found, "
 975                                 "will try mirror inode.");
 976                 fe_error = 1;
 977         } else if (UDF_I(mdata->s_metadata_fe)->i_alloc_type !=
 978                  ICBTAG_FLAG_AD_SHORT) {
 979                 udf_warning(sb, __func__, "metadata inode efe does not have "
 980                         "short allocation descriptors!");
 981                 fe_error = 1;
 982                 iput(mdata->s_metadata_fe);
 983                 mdata->s_metadata_fe = NULL;
 984         }
 985
 986         /* mirror file entry */
 987         addr.logicalBlockNum = mdata->s_mirror_file_loc;
 988         addr.partitionReferenceNum = map->s_partition_num;
 989
 990         udf_debug("Mirror metadata file location: block = %d part = %d\n",
 991                           addr.logicalBlockNum, addr.partitionReferenceNum);
 992
 993         mdata->s_mirror_fe = udf_iget(sb, addr);
 994
 995         if (mdata->s_mirror_fe == NULL) {
 996                 if (fe_error) {
 997                         udf_error(sb, __func__, "mirror inode efe not found "
 998                         "and metadata inode is missing too, exiting...");
 999                         goto error_exit;
1000                 } else
1001                         udf_warning(sb, __func__, "mirror inode efe not found,"
1002                                         " but metadata inode is OK");
1003         } else if (UDF_I(mdata->s_mirror_fe)->i_alloc_type !=
1004                  ICBTAG_FLAG_AD_SHORT) {
1005                 udf_warning(sb, __func__, "mirror inode efe does not have "
1006                         "short allocation descriptors!");
1007                 iput(mdata->s_mirror_fe);
1008                 mdata->s_mirror_fe = NULL;
1009                 if (fe_error)
1010                         goto error_exit;
1011         }
1012
1013         /*
1014          * bitmap file entry
1015          * Note:
1016          * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
1017         */
1018         if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
1019                 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
1020                 addr.partitionReferenceNum = map->s_partition_num;
1021
1022                 udf_debug("Bitmap file location: block = %d part = %d\n",
1023                         addr.logicalBlockNum, addr.partitionReferenceNum);
1024
1025                 mdata->s_bitmap_fe = udf_iget(sb, addr);
1026
1027                 if (mdata->s_bitmap_fe == NULL) {
1028                         if (sb->s_flags & MS_RDONLY)
1029                                 udf_warning(sb, __func__, "bitmap inode efe "
1030                                         "not found but it's ok since the disc"
1031                                         " is mounted read-only");
1032                         else {
1033                                 udf_error(sb, __func__, "bitmap inode efe not "
1034                                         "found and attempted read-write mount");
1035                                 goto error_exit;
1036                         }
1037                 }
1038         }
1039
1040         udf_debug("udf_load_metadata_files Ok\n");
1041
1042         return 0;
1043
1044 error_exit:
1045         return 1;
1046 }
1047
1048 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
1049                              kernel_lb_addr *root)
1050 {
1051         struct fileSetDesc *fset;
1052
1053         fset = (struct fileSetDesc *)bh->b_data;
1054
1055         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
1056
1057         UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
1058
1059         udf_debug("Rootdir at block=%d, partition=%d\n",
1060                   root->logicalBlockNum, root->partitionReferenceNum);
1061 }
1062
1063 int udf_compute_nr_groups(struct super_block *sb, u32 partition)
1064 {
1065         struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
1066         return DIV_ROUND_UP(map->s_partition_len +
1067                             (sizeof(struct spaceBitmapDesc) << 3),
1068                             sb->s_blocksize * 8);
1069 }
1070
1071 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
1072 {
1073         struct udf_bitmap *bitmap;
1074         int nr_groups;
1075         int size;
1076
1077         nr_groups = udf_compute_nr_groups(sb, index);
1078         size = sizeof(struct udf_bitmap) +
1079                 (sizeof(struct buffer_head *) * nr_groups);
1080
1081         if (size <= PAGE_SIZE)
1082                 bitmap = kmalloc(size, GFP_KERNEL);
1083         else
1084                 bitmap = vmalloc(size); /* TODO: get rid of vmalloc */
1085
1086         if (bitmap == NULL) {
1087                 udf_error(sb, __FUNCTION__,
1088                           "Unable to allocate space for bitmap "
1089                           "and %d buffer_head pointers", nr_groups);
1090                 return NULL;
1091         }
1092
1093         memset(bitmap, 0x00, size);
1094         bitmap->s_block_bitmap = (struct buffer_head **)(bitmap + 1);
1095         bitmap->s_nr_groups = nr_groups;
1096         return bitmap;
1097 }
1098
1099 static int udf_fill_partdesc_info(struct super_block *sb,
1100                 struct partitionDesc *p, int p_index)
1101 {
1102         struct udf_part_map *map;
1103         struct udf_sb_info *sbi = UDF_SB(sb);
1104         struct partitionHeaderDesc *phd;
1105
1106         map = &sbi->s_partmaps[p_index];
1107
1108         map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
1109         map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
1110
1111         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
1112                 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
1113         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
1114                 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
1115         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
1116                 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
1117         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
1118                 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
1119
1120         udf_debug("Partition (%d:%d type %x) starts at physical %d, "
1121                   "block length %d\n", partitionNumber, p_index,
1122                   map->s_partition_type, map->s_partition_root,
1123                   map->s_partition_len);
1124
1125         if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1126             strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
1127                 return 0;
1128
1129         phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1130         if (phd->unallocSpaceTable.extLength) {
1131                 kernel_lb_addr loc = {
1132                         .logicalBlockNum = le32_to_cpu(
1133                                 phd->unallocSpaceTable.extPosition),
1134                         .partitionReferenceNum = p_index,
1135                 };
1136
1137                 map->s_uspace.s_table = udf_iget(sb, loc);
1138                 if (!map->s_uspace.s_table) {
1139                         udf_debug("cannot load unallocSpaceTable (part %d)\n",
1140                                         p_index);
1141                         return 1;
1142                 }
1143                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1144                 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
1145                                 p_index, map->s_uspace.s_table->i_ino);
1146         }
1147
1148         if (phd->unallocSpaceBitmap.extLength) {
1149                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1150                 if (!bitmap)
1151                         return 1;
1152                 map->s_uspace.s_bitmap = bitmap;
1153                 bitmap->s_extLength = le32_to_cpu(
1154                                 phd->unallocSpaceBitmap.extLength);
1155                 bitmap->s_extPosition = le32_to_cpu(
1156                                 phd->unallocSpaceBitmap.extPosition);
1157                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1158                 udf_debug("unallocSpaceBitmap (part %d) @ %d\n", p_index,
1159                                                 bitmap->s_extPosition);
1160         }
1161
1162         if (phd->partitionIntegrityTable.extLength)
1163                 udf_debug("partitionIntegrityTable (part %d)\n", p_index);
1164
1165         if (phd->freedSpaceTable.extLength) {
1166                 kernel_lb_addr loc = {
1167                         .logicalBlockNum = le32_to_cpu(
1168                                 phd->freedSpaceTable.extPosition),
1169                         .partitionReferenceNum = p_index,
1170                 };
1171
1172                 map->s_fspace.s_table = udf_iget(sb, loc);
1173                 if (!map->s_fspace.s_table) {
1174                         udf_debug("cannot load freedSpaceTable (part %d)\n",
1175                                 p_index);
1176                         return 1;
1177                 }
1178
1179                 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
1180                 udf_debug("freedSpaceTable (part %d) @ %ld\n",
1181                                 p_index, map->s_fspace.s_table->i_ino);
1182         }
1183
1184         if (phd->freedSpaceBitmap.extLength) {
1185                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1186                 if (!bitmap)
1187                         return 1;
1188                 map->s_fspace.s_bitmap = bitmap;
1189                 bitmap->s_extLength = le32_to_cpu(
1190                                 phd->freedSpaceBitmap.extLength);
1191                 bitmap->s_extPosition = le32_to_cpu(
1192                                 phd->freedSpaceBitmap.extPosition);
1193                 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1194                 udf_debug("freedSpaceBitmap (part %d) @ %d\n", p_index,
1195                                         bitmap->s_extPosition);
1196         }
1197         return 0;
1198 }
1199
1200 static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1201 {
1202         struct udf_sb_info *sbi = UDF_SB(sb);
1203         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1204         kernel_lb_addr ino;
1205         struct buffer_head *bh = NULL;
1206         struct udf_inode_info *vati;
1207         uint32_t pos;
1208         struct virtualAllocationTable20 *vat20;
1209
1210         /* VAT file entry is in the last recorded block */
1211         ino.partitionReferenceNum = type1_index;
1212         ino.logicalBlockNum = sbi->s_last_block - map->s_partition_root;
1213         sbi->s_vat_inode = udf_iget(sb, ino);
1214         if (!sbi->s_vat_inode)
1215                 return 1;
1216
1217         if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1218                 map->s_type_specific.s_virtual.s_start_offset = 0;
1219                 map->s_type_specific.s_virtual.s_num_entries =
1220                         (sbi->s_vat_inode->i_size - 36) >> 2;
1221         } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1222                 vati = UDF_I(sbi->s_vat_inode);
1223                 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1224                         pos = udf_block_map(sbi->s_vat_inode, 0);
1225                         bh = sb_bread(sb, pos);
1226                         if (!bh)
1227                                 return 1;
1228                         vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1229                 } else {
1230                         vat20 = (struct virtualAllocationTable20 *)
1231                                                         vati->i_ext.i_data;
1232                 }
1233
1234                 map->s_type_specific.s_virtual.s_start_offset =
1235                         le16_to_cpu(vat20->lengthHeader);
1236                 map->s_type_specific.s_virtual.s_num_entries =
1237                         (sbi->s_vat_inode->i_size -
1238                                 map->s_type_specific.s_virtual.
1239                                         s_start_offset) >> 2;
1240                 brelse(bh);
1241         }
1242         return 0;
1243 }
1244
1245 static int udf_load_partdesc(struct super_block *sb, sector_t block)
1246 {
1247         struct buffer_head *bh;
1248         struct partitionDesc *p;
1249         struct udf_part_map *map;
1250         struct udf_sb_info *sbi = UDF_SB(sb);
1251         int i, type1_idx;
1252         uint16_t partitionNumber;
1253         uint16_t ident;
1254         int ret = 0;
1255
1256         bh = udf_read_tagged(sb, block, block, &ident);
1257         if (!bh)
1258                 return 1;
1259         if (ident != TAG_IDENT_PD)
1260                 goto out_bh;
1261
1262         p = (struct partitionDesc *)bh->b_data;
1263         partitionNumber = le16_to_cpu(p->partitionNumber);
1264
1265         /* First scan for TYPE1, SPARABLE and METADATA partitions */
1266         for (i = 0; i < sbi->s_partitions; i++) {
1267                 map = &sbi->s_partmaps[i];
1268                 udf_debug("Searching map: (%d == %d)\n",
1269                           map->s_partition_num, partitionNumber);
1270                 if (map->s_partition_num == partitionNumber &&
1271                     (map->s_partition_type == UDF_TYPE1_MAP15 ||
1272                      map->s_partition_type == UDF_SPARABLE_MAP15))
1273                         break;
1274         }
1275
1276         if (i >= sbi->s_partitions) {
1277                 udf_debug("Partition (%d) not found in partition map\n",
1278                           partitionNumber);
1279                 goto out_bh;
1280         }
1281
1282         ret = udf_fill_partdesc_info(sb, p, i);
1283
1284         /*
1285          * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1286          * PHYSICAL partitions are already set up
1287          */
1288         type1_idx = i;
1289         for (i = 0; i < sbi->s_partitions; i++) {
1290                 map = &sbi->s_partmaps[i];
1291
1292                 if (map->s_partition_num == partitionNumber &&
1293                     (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1294                      map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1295                      map->s_partition_type == UDF_METADATA_MAP25))
1296                         break;
1297         }
1298
1299         if (i >= sbi->s_partitions)
1300                 goto out_bh;
1301
1302         ret = udf_fill_partdesc_info(sb, p, i);
1303         if (ret)
1304                 goto out_bh;
1305
1306         if (map->s_partition_type == UDF_METADATA_MAP25) {
1307                 ret = udf_load_metadata_files(sb, i);
1308                 if (ret) {
1309                         printk(KERN_ERR "UDF-fs: error loading MetaData "
1310                         "partition map %d\n", i);
1311                         goto out_bh;
1312                 }
1313         } else {
1314                 ret = udf_load_vat(sb, i, type1_idx);
1315                 if (ret)
1316                         goto out_bh;
1317                 /*
1318                  * Mark filesystem read-only if we have a partition with
1319                  * virtual map since we don't handle writing to it (we
1320                  * overwrite blocks instead of relocating them).
1321                  */
1322                 sb->s_flags |= MS_RDONLY;
1323                 printk(KERN_NOTICE "UDF-fs: Filesystem marked read-only "
1324                         "because writing to pseudooverwrite partition is "
1325                         "not implemented.\n");
1326         }
1327 out_bh:
1328         /* In case loading failed, we handle cleanup in udf_fill_super */
1329         brelse(bh);
1330         return ret;
1331 }
1332
1333 static int udf_load_logicalvol(struct super_block *sb, sector_t block,
1334                                kernel_lb_addr *fileset)
1335 {
1336         struct logicalVolDesc *lvd;
1337         int i, j, offset;
1338         uint8_t type;
1339         struct udf_sb_info *sbi = UDF_SB(sb);
1340         struct genericPartitionMap *gpm;
1341         uint16_t ident;
1342         struct buffer_head *bh;
1343         int ret = 0;
1344
1345         bh = udf_read_tagged(sb, block, block, &ident);
1346         if (!bh)
1347                 return 1;
1348         BUG_ON(ident != TAG_IDENT_LVD);
1349         lvd = (struct logicalVolDesc *)bh->b_data;
1350
1351         i = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1352         if (i != 0) {
1353                 ret = i;
1354                 goto out_bh;
1355         }
1356
1357         for (i = 0, offset = 0;
1358              i < sbi->s_partitions && offset < le32_to_cpu(lvd->mapTableLength);
1359              i++, offset += gpm->partitionMapLength) {
1360                 struct udf_part_map *map = &sbi->s_partmaps[i];
1361                 gpm = (struct genericPartitionMap *)
1362                                 &(lvd->partitionMaps[offset]);
1363                 type = gpm->partitionMapType;
1364                 if (type == 1) {
1365                         struct genericPartitionMap1 *gpm1 =
1366                                 (struct genericPartitionMap1 *)gpm;
1367                         map->s_partition_type = UDF_TYPE1_MAP15;
1368                         map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1369                         map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1370                         map->s_partition_func = NULL;
1371                 } else if (type == 2) {
1372                         struct udfPartitionMap2 *upm2 =
1373                                                 (struct udfPartitionMap2 *)gpm;
1374                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1375                                                 strlen(UDF_ID_VIRTUAL))) {
1376                                 u16 suf =
1377                                         le16_to_cpu(((__le16 *)upm2->partIdent.
1378                                                         identSuffix)[0]);
1379                                 if (suf < 0x0200) {
1380                                         map->s_partition_type =
1381                                                         UDF_VIRTUAL_MAP15;
1382                                         map->s_partition_func =
1383                                                         udf_get_pblock_virt15;
1384                                 } else {
1385                                         map->s_partition_type =
1386                                                         UDF_VIRTUAL_MAP20;
1387                                         map->s_partition_func =
1388                                                         udf_get_pblock_virt20;
1389                                 }
1390                         } else if (!strncmp(upm2->partIdent.ident,
1391                                                 UDF_ID_SPARABLE,
1392                                                 strlen(UDF_ID_SPARABLE))) {
1393                                 uint32_t loc;
1394                                 struct sparingTable *st;
1395                                 struct sparablePartitionMap *spm =
1396                                         (struct sparablePartitionMap *)gpm;
1397
1398                                 map->s_partition_type = UDF_SPARABLE_MAP15;
1399                                 map->s_type_specific.s_sparing.s_packet_len =
1400                                                 le16_to_cpu(spm->packetLength);
1401                                 for (j = 0; j < spm->numSparingTables; j++) {
1402                                         struct buffer_head *bh2;
1403
1404                                         loc = le32_to_cpu(
1405                                                 spm->locSparingTable[j]);
1406                                         bh2 = udf_read_tagged(sb, loc, loc,
1407                                                              &ident);
1408                                         map->s_type_specific.s_sparing.
1409                                                         s_spar_map[j] = bh2;
1410
1411                                         if (bh2 == NULL)
1412                                                 continue;
1413
1414                                         st = (struct sparingTable *)bh2->b_data;
1415                                         if (ident != 0 || strncmp(
1416                                                 st->sparingIdent.ident,
1417                                                 UDF_ID_SPARING,
1418                                                 strlen(UDF_ID_SPARING))) {
1419                                                 brelse(bh2);
1420                                                 map->s_type_specific.s_sparing.
1421                                                         s_spar_map[j] = NULL;
1422                                         }
1423                                 }
1424                                 map->s_partition_func = udf_get_pblock_spar15;
1425                         } else if (!strncmp(upm2->partIdent.ident,
1426                                                 UDF_ID_METADATA,
1427                                                 strlen(UDF_ID_METADATA))) {
1428                                 struct udf_meta_data *mdata =
1429                                         &map->s_type_specific.s_metadata;
1430                                 struct metadataPartitionMap *mdm =
1431                                                 (struct metadataPartitionMap *)
1432                                                 &(lvd->partitionMaps[offset]);
1433                                 udf_debug("Parsing Logical vol part %d "
1434                                         "type %d  id=%s\n", i, type,
1435                                         UDF_ID_METADATA);
1436
1437                                 map->s_partition_type = UDF_METADATA_MAP25;
1438                                 map->s_partition_func = udf_get_pblock_meta25;
1439
1440                                 mdata->s_meta_file_loc   =
1441                                         le32_to_cpu(mdm->metadataFileLoc);
1442                                 mdata->s_mirror_file_loc =
1443                                         le32_to_cpu(mdm->metadataMirrorFileLoc);
1444                                 mdata->s_bitmap_file_loc =
1445                                         le32_to_cpu(mdm->metadataBitmapFileLoc);
1446                                 mdata->s_alloc_unit_size =
1447                                         le32_to_cpu(mdm->allocUnitSize);
1448                                 mdata->s_align_unit_size =
1449                                         le16_to_cpu(mdm->alignUnitSize);
1450                                 mdata->s_dup_md_flag     =
1451                                         mdm->flags & 0x01;
1452
1453                                 udf_debug("Metadata Ident suffix=0x%x\n",
1454                                         (le16_to_cpu(
1455                                          ((__le16 *)
1456                                               mdm->partIdent.identSuffix)[0])));
1457                                 udf_debug("Metadata part num=%d\n",
1458                                         le16_to_cpu(mdm->partitionNum));
1459                                 udf_debug("Metadata part alloc unit size=%d\n",
1460                                         le32_to_cpu(mdm->allocUnitSize));
1461                                 udf_debug("Metadata file loc=%d\n",
1462                                         le32_to_cpu(mdm->metadataFileLoc));
1463                                 udf_debug("Mirror file loc=%d\n",
1464                                        le32_to_cpu(mdm->metadataMirrorFileLoc));
1465                                 udf_debug("Bitmap file loc=%d\n",
1466                                        le32_to_cpu(mdm->metadataBitmapFileLoc));
1467                                 udf_debug("Duplicate Flag: %d %d\n",
1468                                         mdata->s_dup_md_flag, mdm->flags);
1469                         } else {
1470                                 udf_debug("Unknown ident: %s\n",
1471                                           upm2->partIdent.ident);
1472                                 continue;
1473                         }
1474                         map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1475                         map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1476                 }
1477                 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1478                           i, map->s_partition_num, type,
1479                           map->s_volumeseqnum);
1480         }
1481
1482         if (fileset) {
1483                 long_ad *la = (long_ad *)&(lvd->logicalVolContentsUse[0]);
1484
1485                 *fileset = lelb_to_cpu(la->extLocation);
1486                 udf_debug("FileSet found in LogicalVolDesc at block=%d, "
1487                           "partition=%d\n", fileset->logicalBlockNum,
1488                           fileset->partitionReferenceNum);
1489         }
1490         if (lvd->integritySeqExt.extLength)
1491                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1492
1493 out_bh:
1494         brelse(bh);
1495         return ret;
1496 }
1497
1498 /*
1499  * udf_load_logicalvolint
1500  *
1501  */
1502 static void udf_load_logicalvolint(struct super_block *sb, kernel_extent_ad loc)
1503 {
1504         struct buffer_head *bh = NULL;
1505         uint16_t ident;
1506         struct udf_sb_info *sbi = UDF_SB(sb);
1507         struct logicalVolIntegrityDesc *lvid;
1508
1509         while (loc.extLength > 0 &&
1510                (bh = udf_read_tagged(sb, loc.extLocation,
1511                                      loc.extLocation, &ident)) &&
1512                ident == TAG_IDENT_LVID) {
1513                 sbi->s_lvid_bh = bh;
1514                 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1515
1516                 if (lvid->nextIntegrityExt.extLength)
1517                         udf_load_logicalvolint(sb,
1518                                 leea_to_cpu(lvid->nextIntegrityExt));
1519
1520                 if (sbi->s_lvid_bh != bh)
1521                         brelse(bh);
1522                 loc.extLength -= sb->s_blocksize;
1523                 loc.extLocation++;
1524         }
1525         if (sbi->s_lvid_bh != bh)
1526                 brelse(bh);
1527 }
1528
1529 /*
1530  * udf_process_sequence
1531  *
1532  * PURPOSE
1533  *      Process a main/reserve volume descriptor sequence.
1534  *
1535  * PRE-CONDITIONS
1536  *      sb                      Pointer to _locked_ superblock.
1537  *      block                   First block of first extent of the sequence.
1538  *      lastblock               Lastblock of first extent of the sequence.
1539  *
1540  * HISTORY
1541  *      July 1, 1997 - Andrew E. Mileski
1542  *      Written, tested, and released.
1543  */
1544 static noinline int udf_process_sequence(struct super_block *sb, long block,
1545                                 long lastblock, kernel_lb_addr *fileset)
1546 {
1547         struct buffer_head *bh = NULL;
1548         struct udf_vds_record vds[VDS_POS_LENGTH];
1549         struct udf_vds_record *curr;
1550         struct generic_desc *gd;
1551         struct volDescPtr *vdp;
1552         int done = 0;
1553         uint32_t vdsn;
1554         uint16_t ident;
1555         long next_s = 0, next_e = 0;
1556
1557         memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1558
1559         /*
1560          * Read the main descriptor sequence and find which descriptors
1561          * are in it.
1562          */
1563         for (; (!done && block <= lastblock); block++) {
1564
1565                 bh = udf_read_tagged(sb, block, block, &ident);
1566                 if (!bh) {
1567                         printk(KERN_ERR "udf: Block %Lu of volume descriptor "
1568                                "sequence is corrupted or we could not read "
1569                                "it.\n", (unsigned long long)block);
1570                         return 1;
1571                 }
1572
1573                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1574                 gd = (struct generic_desc *)bh->b_data;
1575                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1576                 switch (ident) {
1577                 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1578                         curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1579                         if (vdsn >= curr->volDescSeqNum) {
1580                                 curr->volDescSeqNum = vdsn;
1581                                 curr->block = block;
1582                         }
1583                         break;
1584                 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1585                         curr = &vds[VDS_POS_VOL_DESC_PTR];
1586                         if (vdsn >= curr->volDescSeqNum) {
1587                                 curr->volDescSeqNum = vdsn;
1588                                 curr->block = block;
1589
1590                                 vdp = (struct volDescPtr *)bh->b_data;
1591                                 next_s = le32_to_cpu(
1592                                         vdp->nextVolDescSeqExt.extLocation);
1593                                 next_e = le32_to_cpu(
1594                                         vdp->nextVolDescSeqExt.extLength);
1595                                 next_e = next_e >> sb->s_blocksize_bits;
1596                                 next_e += next_s;
1597                         }
1598                         break;
1599                 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1600                         curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1601                         if (vdsn >= curr->volDescSeqNum) {
1602                                 curr->volDescSeqNum = vdsn;
1603                                 curr->block = block;
1604                         }
1605                         break;
1606                 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1607                         curr = &vds[VDS_POS_PARTITION_DESC];
1608                         if (!curr->block)
1609                                 curr->block = block;
1610                         break;
1611                 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1612                         curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1613                         if (vdsn >= curr->volDescSeqNum) {
1614                                 curr->volDescSeqNum = vdsn;
1615                                 curr->block = block;
1616                         }
1617                         break;
1618                 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1619                         curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1620                         if (vdsn >= curr->volDescSeqNum) {
1621                                 curr->volDescSeqNum = vdsn;
1622                                 curr->block = block;
1623                         }
1624                         break;
1625                 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1626                         vds[VDS_POS_TERMINATING_DESC].block = block;
1627                         if (next_e) {
1628                                 block = next_s;
1629                                 lastblock = next_e;
1630                                 next_s = next_e = 0;
1631                         } else
1632                                 done = 1;
1633                         break;
1634                 }
1635                 brelse(bh);
1636         }
1637         /*
1638          * Now read interesting descriptors again and process them
1639          * in a suitable order
1640          */
1641         if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1642                 printk(KERN_ERR "udf: Primary Volume Descriptor not found!\n");
1643                 return 1;
1644         }
1645         if (udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block))
1646                 return 1;
1647
1648         if (vds[VDS_POS_LOGICAL_VOL_DESC].block && udf_load_logicalvol(sb,
1649             vds[VDS_POS_LOGICAL_VOL_DESC].block, fileset))
1650                 return 1;
1651
1652         if (vds[VDS_POS_PARTITION_DESC].block) {
1653                 /*
1654                  * We rescan the whole descriptor sequence to find
1655                  * partition descriptor blocks and process them.
1656                  */
1657                 for (block = vds[VDS_POS_PARTITION_DESC].block;
1658                      block < vds[VDS_POS_TERMINATING_DESC].block;
1659                      block++)
1660                         if (udf_load_partdesc(sb, block))
1661                                 return 1;
1662         }
1663
1664         return 0;
1665 }
1666
1667 /*
1668  * udf_check_valid()
1669  */
1670 static int udf_check_valid(struct super_block *sb, int novrs, int silent)
1671 {
1672         long block;
1673         struct udf_sb_info *sbi = UDF_SB(sb);
1674
1675         if (novrs) {
1676                 udf_debug("Validity check skipped because of novrs option\n");
1677                 return 0;
1678         }
1679         /* Check that it is NSR02 compliant */
1680         /* Process any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
1681         block = udf_vrs(sb, silent);
1682         if (block == -1)
1683                 udf_debug("Failed to read byte 32768. Assuming open "
1684                           "disc. Skipping validity check\n");
1685         if (block && !sbi->s_last_block)
1686                 sbi->s_last_block = udf_get_last_block(sb);
1687         return !block;
1688 }
1689
1690 static int udf_load_sequence(struct super_block *sb, kernel_lb_addr *fileset)
1691 {
1692         struct anchorVolDescPtr *anchor;
1693         uint16_t ident;
1694         struct buffer_head *bh;
1695         long main_s, main_e, reserve_s, reserve_e;
1696         int i;
1697         struct udf_sb_info *sbi;
1698
1699         if (!sb)
1700                 return 1;
1701         sbi = UDF_SB(sb);
1702
1703         for (i = 0; i < ARRAY_SIZE(sbi->s_anchor); i++) {
1704                 if (!sbi->s_anchor[i])
1705                         continue;
1706
1707                 bh = udf_read_tagged(sb, sbi->s_anchor[i], sbi->s_anchor[i],
1708                                      &ident);
1709                 if (!bh)
1710                         continue;
1711
1712                 anchor = (struct anchorVolDescPtr *)bh->b_data;
1713
1714                 /* Locate the main sequence */
1715                 main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1716                 main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1717                 main_e = main_e >> sb->s_blocksize_bits;
1718                 main_e += main_s;
1719
1720                 /* Locate the reserve sequence */
1721                 reserve_s = le32_to_cpu(
1722                                 anchor->reserveVolDescSeqExt.extLocation);
1723                 reserve_e = le32_to_cpu(
1724                                 anchor->reserveVolDescSeqExt.extLength);
1725                 reserve_e = reserve_e >> sb->s_blocksize_bits;
1726                 reserve_e += reserve_s;
1727
1728                 brelse(bh);
1729
1730                 /* Process the main & reserve sequences */
1731                 /* responsible for finding the PartitionDesc(s) */
1732                 if (!(udf_process_sequence(sb, main_s, main_e,
1733                                            fileset) &&
1734                       udf_process_sequence(sb, reserve_s, reserve_e,
1735                                            fileset)))
1736                         break;
1737         }
1738
1739         if (i == ARRAY_SIZE(sbi->s_anchor)) {
1740                 udf_debug("No Anchor block found\n");
1741                 return 1;
1742         }
1743         udf_debug("Using anchor in block %d\n", sbi->s_anchor[i]);
1744
1745         return 0;
1746 }
1747
1748 static void udf_open_lvid(struct super_block *sb)
1749 {
1750         struct udf_sb_info *sbi = UDF_SB(sb);
1751         struct buffer_head *bh = sbi->s_lvid_bh;
1752         struct logicalVolIntegrityDesc *lvid;
1753         struct logicalVolIntegrityDescImpUse *lvidiu;
1754         if (!bh)
1755                 return;
1756
1757         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1758         lvidiu = udf_sb_lvidiu(sbi);
1759
1760         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1761         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1762         udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
1763                                 CURRENT_TIME);
1764         lvid->integrityType = LVID_INTEGRITY_TYPE_OPEN;
1765
1766         lvid->descTag.descCRC = cpu_to_le16(
1767                 udf_crc((char *)lvid + sizeof(tag),
1768                         le16_to_cpu(lvid->descTag.descCRCLength), 0));
1769
1770         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1771         mark_buffer_dirty(bh);
1772 }
1773
1774 static void udf_close_lvid(struct super_block *sb)
1775 {
1776         struct udf_sb_info *sbi = UDF_SB(sb);
1777         struct buffer_head *bh = sbi->s_lvid_bh;
1778         struct logicalVolIntegrityDesc *lvid;
1779         struct logicalVolIntegrityDescImpUse *lvidiu;
1780
1781         if (!bh)
1782                 return;
1783
1784         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1785
1786         if (lvid->integrityType != LVID_INTEGRITY_TYPE_OPEN)
1787                 return;
1788
1789         lvidiu = udf_sb_lvidiu(sbi);
1790         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1791         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1792         udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
1793         if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1794                 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1795         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1796                 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1797         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
1798                 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
1799         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1800
1801         lvid->descTag.descCRC = cpu_to_le16(
1802                 udf_crc((char *)lvid + sizeof(tag),
1803                         le16_to_cpu(lvid->descTag.descCRCLength),
1804                         0));
1805
1806         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1807         mark_buffer_dirty(bh);
1808 }
1809
1810 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
1811 {
1812         int i;
1813         int nr_groups = bitmap->s_nr_groups;
1814         int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
1815                                                 nr_groups);
1816
1817         for (i = 0; i < nr_groups; i++)
1818                 if (bitmap->s_block_bitmap[i])
1819                         brelse(bitmap->s_block_bitmap[i]);
1820
1821         if (size <= PAGE_SIZE)
1822                 kfree(bitmap);
1823         else
1824                 vfree(bitmap);
1825 }
1826
1827 static void udf_free_partition(struct udf_part_map *map)
1828 {
1829         int i;
1830         struct udf_meta_data *mdata;
1831
1832         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1833                 iput(map->s_uspace.s_table);
1834         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1835                 iput(map->s_fspace.s_table);
1836         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1837                 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
1838         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1839                 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
1840         if (map->s_partition_type == UDF_SPARABLE_MAP15)
1841                 for (i = 0; i < 4; i++)
1842                         brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
1843         else if (map->s_partition_type == UDF_METADATA_MAP25) {
1844                 mdata = &map->s_type_specific.s_metadata;
1845                 iput(mdata->s_metadata_fe);
1846                 mdata->s_metadata_fe = NULL;
1847
1848                 iput(mdata->s_mirror_fe);
1849                 mdata->s_mirror_fe = NULL;
1850
1851                 iput(mdata->s_bitmap_fe);
1852                 mdata->s_bitmap_fe = NULL;
1853         }
1854 }
1855
1856 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1857 {
1858         int i;
1859         struct inode *inode = NULL;
1860         struct udf_options uopt;
1861         kernel_lb_addr rootdir, fileset;
1862         struct udf_sb_info *sbi;
1863
1864         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1865         uopt.uid = -1;
1866         uopt.gid = -1;
1867         uopt.umask = 0;
1868
1869         sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1870         if (!sbi)
1871                 return -ENOMEM;
1872
1873         sb->s_fs_info = sbi;
1874
1875         mutex_init(&sbi->s_alloc_mutex);
1876
1877         if (!udf_parse_options((char *)options, &uopt, false))
1878                 goto error_out;
1879
1880         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1881             uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
1882                 udf_error(sb, "udf_read_super",
1883                           "utf8 cannot be combined with iocharset\n");
1884                 goto error_out;
1885         }
1886 #ifdef CONFIG_UDF_NLS
1887         if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1888                 uopt.nls_map = load_nls_default();
1889                 if (!uopt.nls_map)
1890                         uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1891                 else
1892                         udf_debug("Using default NLS map\n");
1893         }
1894 #endif
1895         if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1896                 uopt.flags |= (1 << UDF_FLAG_UTF8);
1897
1898         fileset.logicalBlockNum = 0xFFFFFFFF;
1899         fileset.partitionReferenceNum = 0xFFFF;
1900
1901         sbi->s_flags = uopt.flags;
1902         sbi->s_uid = uopt.uid;
1903         sbi->s_gid = uopt.gid;
1904         sbi->s_umask = uopt.umask;
1905         sbi->s_nls_map = uopt.nls_map;
1906
1907         /* Set the block size for all transfers */
1908         if (!sb_min_blocksize(sb, uopt.blocksize)) {
1909                 udf_debug("Bad block size (%d)\n", uopt.blocksize);
1910                 printk(KERN_ERR "udf: bad block size (%d)\n", uopt.blocksize);
1911                 goto error_out;
1912         }
1913
1914         if (uopt.session == 0xFFFFFFFF)
1915                 sbi->s_session = udf_get_last_session(sb);
1916         else
1917                 sbi->s_session = uopt.session;
1918
1919         udf_debug("Multi-session=%d\n", sbi->s_session);
1920
1921         sbi->s_last_block = uopt.lastblock;
1922         sbi->s_anchor[0] = sbi->s_anchor[1] = 0;
1923         sbi->s_anchor[2] = uopt.anchor;
1924
1925         if (udf_check_valid(sb, uopt.novrs, silent)) {
1926                 /* read volume recognition sequences */
1927                 printk(KERN_WARNING "UDF-fs: No VRS found\n");
1928                 goto error_out;
1929         }
1930
1931         udf_find_anchor(sb);
1932
1933         /* Fill in the rest of the superblock */
1934         sb->s_op = &udf_sb_ops;
1935         sb->dq_op = NULL;
1936         sb->s_dirt = 0;
1937         sb->s_magic = UDF_SUPER_MAGIC;
1938         sb->s_time_gran = 1000;
1939
1940         if (udf_load_sequence(sb, &fileset)) {
1941                 printk(KERN_WARNING "UDF-fs: No partition found (1)\n");
1942                 goto error_out;
1943         }
1944
1945         udf_debug("Lastblock=%d\n", sbi->s_last_block);
1946
1947         if (sbi->s_lvid_bh) {
1948                 struct logicalVolIntegrityDescImpUse *lvidiu =
1949                                                         udf_sb_lvidiu(sbi);
1950                 uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
1951                 uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
1952                 /* uint16_t maxUDFWriteRev =
1953                                 le16_to_cpu(lvidiu->maxUDFWriteRev); */
1954
1955                 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
1956                         printk(KERN_ERR "UDF-fs: minUDFReadRev=%x "
1957                                         "(max is %x)\n",
1958                                le16_to_cpu(lvidiu->minUDFReadRev),
1959                                UDF_MAX_READ_VERSION);
1960                         goto error_out;
1961                 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
1962                         sb->s_flags |= MS_RDONLY;
1963
1964                 sbi->s_udfrev = minUDFWriteRev;
1965
1966                 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1967                         UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
1968                 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
1969                         UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
1970         }
1971
1972         if (!sbi->s_partitions) {
1973                 printk(KERN_WARNING "UDF-fs: No partition found (2)\n");
1974                 goto error_out;
1975         }
1976
1977         if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
1978                         UDF_PART_FLAG_READ_ONLY) {
1979                 printk(KERN_NOTICE "UDF-fs: Partition marked readonly; "
1980                                    "forcing readonly mount\n");
1981                 sb->s_flags |= MS_RDONLY;
1982         }
1983
1984         if (udf_find_fileset(sb, &fileset, &rootdir)) {
1985                 printk(KERN_WARNING "UDF-fs: No fileset found\n");
1986                 goto error_out;
1987         }
1988
1989         if (!silent) {
1990                 timestamp ts;
1991                 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
1992                 udf_info("UDF: Mounting volume '%s', "
1993                          "timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
1994                          sbi->s_volume_ident, le16_to_cpu(ts.year), ts.month, ts.day,
1995                          ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
1996         }
1997         if (!(sb->s_flags & MS_RDONLY))
1998                 udf_open_lvid(sb);
1999
2000         /* Assign the root inode */
2001         /* assign inodes by physical block number */
2002         /* perhaps it's not extensible enough, but for now ... */
2003         inode = udf_iget(sb, rootdir);
2004         if (!inode) {
2005                 printk(KERN_ERR "UDF-fs: Error in udf_iget, block=%d, "
2006                                 "partition=%d\n",
2007                        rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
2008                 goto error_out;
2009         }
2010
2011         /* Allocate a dentry for the root inode */
2012         sb->s_root = d_alloc_root(inode);
2013         if (!sb->s_root) {
2014                 printk(KERN_ERR "UDF-fs: Couldn't allocate root dentry\n");
2015                 iput(inode);
2016                 goto error_out;
2017         }
2018         sb->s_maxbytes = MAX_LFS_FILESIZE;
2019         return 0;
2020
2021 error_out:
2022         if (sbi->s_vat_inode)
2023                 iput(sbi->s_vat_inode);
2024         if (sbi->s_partitions)
2025                 for (i = 0; i < sbi->s_partitions; i++)
2026                         udf_free_partition(&sbi->s_partmaps[i]);
2027 #ifdef CONFIG_UDF_NLS
2028         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2029                 unload_nls(sbi->s_nls_map);
2030 #endif
2031         if (!(sb->s_flags & MS_RDONLY))
2032                 udf_close_lvid(sb);
2033         brelse(sbi->s_lvid_bh);
2034
2035         kfree(sbi->s_partmaps);
2036         kfree(sbi);
2037         sb->s_fs_info = NULL;
2038
2039         return -EINVAL;
2040 }
2041
2042 static void udf_error(struct super_block *sb, const char *function,
2043                       const char *fmt, ...)
2044 {
2045         va_list args;
2046
2047         if (!(sb->s_flags & MS_RDONLY)) {
2048                 /* mark sb error */
2049                 sb->s_dirt = 1;
2050         }
2051         va_start(args, fmt);
2052         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2053         va_end(args);
2054         printk(KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
2055                 sb->s_id, function, error_buf);
2056 }
2057
2058 void udf_warning(struct super_block *sb, const char *function,
2059                  const char *fmt, ...)
2060 {
2061         va_list args;
2062
2063         va_start(args, fmt);
2064         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2065         va_end(args);
2066         printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
2067                sb->s_id, function, error_buf);
2068 }
2069
2070 static void udf_put_super(struct super_block *sb)
2071 {
2072         int i;
2073         struct udf_sb_info *sbi;
2074
2075         sbi = UDF_SB(sb);
2076         if (sbi->s_vat_inode)
2077                 iput(sbi->s_vat_inode);
2078         if (sbi->s_partitions)
2079                 for (i = 0; i < sbi->s_partitions; i++)
2080                         udf_free_partition(&sbi->s_partmaps[i]);
2081 #ifdef CONFIG_UDF_NLS
2082         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2083                 unload_nls(sbi->s_nls_map);
2084 #endif
2085         if (!(sb->s_flags & MS_RDONLY))
2086                 udf_close_lvid(sb);
2087         brelse(sbi->s_lvid_bh);
2088         kfree(sbi->s_partmaps);
2089         kfree(sb->s_fs_info);
2090         sb->s_fs_info = NULL;
2091 }
2092
2093 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
2094 {
2095         struct super_block *sb = dentry->d_sb;
2096         struct udf_sb_info *sbi = UDF_SB(sb);
2097         struct logicalVolIntegrityDescImpUse *lvidiu;
2098
2099         if (sbi->s_lvid_bh != NULL)
2100                 lvidiu = udf_sb_lvidiu(sbi);
2101         else
2102                 lvidiu = NULL;
2103
2104         buf->f_type = UDF_SUPER_MAGIC;
2105         buf->f_bsize = sb->s_blocksize;
2106         buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
2107         buf->f_bfree = udf_count_free(sb);
2108         buf->f_bavail = buf->f_bfree;
2109         buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2110                                           le32_to_cpu(lvidiu->numDirs)) : 0)
2111                         + buf->f_bfree;
2112         buf->f_ffree = buf->f_bfree;
2113         /* __kernel_fsid_t f_fsid */
2114         buf->f_namelen = UDF_NAME_LEN - 2;
2115
2116         return 0;
2117 }
2118
2119 static unsigned int udf_count_free_bitmap(struct super_block *sb,
2120                                           struct udf_bitmap *bitmap)
2121 {
2122         struct buffer_head *bh = NULL;
2123         unsigned int accum = 0;
2124         int index;
2125         int block = 0, newblock;
2126         kernel_lb_addr loc;
2127         uint32_t bytes;
2128         uint8_t *ptr;
2129         uint16_t ident;
2130         struct spaceBitmapDesc *bm;
2131
2132         lock_kernel();
2133
2134         loc.logicalBlockNum = bitmap->s_extPosition;
2135         loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
2136         bh = udf_read_ptagged(sb, loc, 0, &ident);
2137
2138         if (!bh) {
2139                 printk(KERN_ERR "udf: udf_count_free failed\n");
2140                 goto out;
2141         } else if (ident != TAG_IDENT_SBD) {
2142                 brelse(bh);
2143                 printk(KERN_ERR "udf: udf_count_free failed\n");
2144                 goto out;
2145         }
2146
2147         bm = (struct spaceBitmapDesc *)bh->b_data;
2148         bytes = le32_to_cpu(bm->numOfBytes);
2149         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2150         ptr = (uint8_t *)bh->b_data;
2151
2152         while (bytes > 0) {
2153                 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2154                 accum += bitmap_weight((const unsigned long *)(ptr + index),
2155                                         cur_bytes * 8);
2156                 bytes -= cur_bytes;
2157                 if (bytes) {
2158                         brelse(bh);
2159                         newblock = udf_get_lb_pblock(sb, loc, ++block);
2160                         bh = udf_tread(sb, newblock);
2161                         if (!bh) {
2162                                 udf_debug("read failed\n");
2163                                 goto out;
2164                         }
2165                         index = 0;
2166                         ptr = (uint8_t *)bh->b_data;
2167                 }
2168         }
2169         brelse(bh);
2170
2171 out:
2172         unlock_kernel();
2173
2174         return accum;
2175 }
2176
2177 static unsigned int udf_count_free_table(struct super_block *sb,
2178                                          struct inode *table)
2179 {
2180         unsigned int accum = 0;
2181         uint32_t elen;
2182         kernel_lb_addr eloc;
2183         int8_t etype;
2184         struct extent_position epos;
2185
2186         lock_kernel();
2187
2188         epos.block = UDF_I(table)->i_location;
2189         epos.offset = sizeof(struct unallocSpaceEntry);
2190         epos.bh = NULL;
2191
2192         while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2193                 accum += (elen >> table->i_sb->s_blocksize_bits);
2194
2195         brelse(epos.bh);
2196
2197         unlock_kernel();
2198
2199         return accum;
2200 }
2201
2202 static unsigned int udf_count_free(struct super_block *sb)
2203 {
2204         unsigned int accum = 0;
2205         struct udf_sb_info *sbi;
2206         struct udf_part_map *map;
2207
2208         sbi = UDF_SB(sb);
2209         if (sbi->s_lvid_bh) {
2210                 struct logicalVolIntegrityDesc *lvid =
2211                         (struct logicalVolIntegrityDesc *)
2212                         sbi->s_lvid_bh->b_data;
2213                 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
2214                         accum = le32_to_cpu(
2215                                         lvid->freeSpaceTable[sbi->s_partition]);
2216                         if (accum == 0xFFFFFFFF)
2217                                 accum = 0;
2218                 }
2219         }
2220
2221         if (accum)
2222                 return accum;
2223
2224         map = &sbi->s_partmaps[sbi->s_partition];
2225         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2226                 accum += udf_count_free_bitmap(sb,
2227                                                map->s_uspace.s_bitmap);
2228         }
2229         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
2230                 accum += udf_count_free_bitmap(sb,
2231                                                map->s_fspace.s_bitmap);
2232         }
2233         if (accum)
2234                 return accum;
2235
2236         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2237                 accum += udf_count_free_table(sb,
2238                                               map->s_uspace.s_table);
2239         }
2240         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
2241                 accum += udf_count_free_table(sb,
2242                                               map->s_fspace.s_table);
2243         }
2244
2245         return accum;
2246 }