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 <linux/crc-itu-t.h>
  60 #include <asm/byteorder.h>
  61
  62 #include "udf_sb.h"
  63 #include "udf_i.h"
  64
  65 #include <linux/init.h>
  66 #include <asm/uaccess.h>
  67
  68 #define VDS_POS_PRIMARY_VOL_DESC        0
  69 #define VDS_POS_UNALLOC_SPACE_DESC      1
  70 #define VDS_POS_LOGICAL_VOL_DESC        2
  71 #define VDS_POS_PARTITION_DESC          3
  72 #define VDS_POS_IMP_USE_VOL_DESC        4
  73 #define VDS_POS_VOL_DESC_PTR            5
  74 #define VDS_POS_TERMINATING_DESC        6
  75 #define VDS_POS_LENGTH                  7
  76
  77 #define UDF_DEFAULT_BLOCKSIZE 2048
  78
  79 static char error_buf[1024];
  80
  81 /* These are the "meat" - everything else is stuffing */
  82 static int udf_fill_super(struct super_block *, void *, int);
  83 static void udf_put_super(struct super_block *);
  84 static void udf_write_super(struct super_block *);
  85 static int udf_remount_fs(struct super_block *, int *, char *);
  86 static int udf_check_valid(struct super_block *, int, int);
  87 static int udf_vrs(struct super_block *sb, int silent);
  88 static void udf_load_logicalvolint(struct super_block *, kernel_extent_ad);
  89 static void udf_find_anchor(struct super_block *);
  90 static int udf_find_fileset(struct super_block *, kernel_lb_addr *,
  91                             kernel_lb_addr *);
  92 static void udf_load_fileset(struct super_block *, struct buffer_head *,
  93                              kernel_lb_addr *);
  94 static void udf_open_lvid(struct super_block *);
  95 static void udf_close_lvid(struct super_block *);
  96 static unsigned int udf_count_free(struct super_block *);
  97 static int udf_statfs(struct dentry *, struct kstatfs *);
  98 static int udf_show_options(struct seq_file *, struct vfsmount *);
  99 static void udf_error(struct super_block *sb, const char *function,
 100                       const char *fmt, ...);
 101
 102 struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct udf_sb_info *sbi)
 103 {
 104         struct logicalVolIntegrityDesc *lvid =
 105                 (struct logicalVolIntegrityDesc *)sbi->s_lvid_bh->b_data;
 106         __u32 number_of_partitions = le32_to_cpu(lvid->numOfPartitions);
 107         __u32 offset = number_of_partitions * 2 *
 108                                 sizeof(uint32_t)/sizeof(uint8_t);
 109         return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
 110 }
 111
 112 /* UDF filesystem type */
 113 static int udf_get_sb(struct file_system_type *fs_type,
 114                       int flags, const char *dev_name, void *data,
 115                       struct vfsmount *mnt)
 116 {
 117         return get_sb_bdev(fs_type, flags, dev_name, data, udf_fill_super, mnt);
 118 }
 119
 120 static struct file_system_type udf_fstype = {
 121         .owner          = THIS_MODULE,
 122         .name           = "udf",
 123         .get_sb         = udf_get_sb,
 124         .kill_sb        = kill_block_super,
 125         .fs_flags       = FS_REQUIRES_DEV,
 126 };
 127
 128 static struct kmem_cache *udf_inode_cachep;
 129
 130 static struct inode *udf_alloc_inode(struct super_block *sb)
 131 {
 132         struct udf_inode_info *ei;
 133         ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
 134         if (!ei)
 135                 return NULL;
 136
 137         ei->i_unique = 0;
 138         ei->i_lenExtents = 0;
 139         ei->i_next_alloc_block = 0;
 140         ei->i_next_alloc_goal = 0;
 141         ei->i_strat4096 = 0;
 142
 143         return &ei->vfs_inode;
 144 }
 145
 146 static void udf_destroy_inode(struct inode *inode)
 147 {
 148         kmem_cache_free(udf_inode_cachep, UDF_I(inode));
 149 }
 150
 151 static void init_once(struct kmem_cache *cachep, void *foo)
 152 {
 153         struct udf_inode_info *ei = (struct udf_inode_info *)foo;
 154
 155         ei->i_ext.i_data = NULL;
 156         inode_init_once(&ei->vfs_inode);
 157 }
 158
 159 static int init_inodecache(void)
 160 {
 161         udf_inode_cachep = kmem_cache_create("udf_inode_cache",
 162                                              sizeof(struct udf_inode_info),
 163                                              0, (SLAB_RECLAIM_ACCOUNT |
 164                                                  SLAB_MEM_SPREAD),
 165                                              init_once);
 166         if (!udf_inode_cachep)
 167                 return -ENOMEM;
 168         return 0;
 169 }
 170
 171 static void destroy_inodecache(void)
 172 {
 173         kmem_cache_destroy(udf_inode_cachep);
 174 }
 175
 176 /* Superblock operations */
 177 static const struct super_operations udf_sb_ops = {
 178         .alloc_inode    = udf_alloc_inode,
 179         .destroy_inode  = udf_destroy_inode,
 180         .write_inode    = udf_write_inode,
 181         .delete_inode   = udf_delete_inode,
 182         .clear_inode    = udf_clear_inode,
 183         .put_super      = udf_put_super,
 184         .write_super    = udf_write_super,
 185         .statfs         = udf_statfs,
 186         .remount_fs     = udf_remount_fs,
 187         .show_options   = udf_show_options,
 188 };
 189
 190 struct udf_options {
 191         unsigned char novrs;
 192         unsigned int blocksize;
 193         unsigned int session;
 194         unsigned int lastblock;
 195         unsigned int anchor;
 196         unsigned int volume;
 197         unsigned short partition;
 198         unsigned int fileset;
 199         unsigned int rootdir;
 200         unsigned int flags;
 201         mode_t umask;
 202         gid_t gid;
 203         uid_t uid;
 204         struct nls_table *nls_map;
 205 };
 206
 207 static int __init init_udf_fs(void)
 208 {
 209         int err;
 210
 211         err = init_inodecache();
 212         if (err)
 213                 goto out1;
 214         err = register_filesystem(&udf_fstype);
 215         if (err)
 216                 goto out;
 217
 218         return 0;
 219
 220 out:
 221         destroy_inodecache();
 222
 223 out1:
 224         return err;
 225 }
 226
 227 static void __exit exit_udf_fs(void)
 228 {
 229         unregister_filesystem(&udf_fstype);
 230         destroy_inodecache();
 231 }
 232
 233 module_init(init_udf_fs)
 234 module_exit(exit_udf_fs)
 235
 236 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
 237 {
 238         struct udf_sb_info *sbi = UDF_SB(sb);
 239
 240         sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map),
 241                                   GFP_KERNEL);
 242         if (!sbi->s_partmaps) {
 243                 udf_error(sb, __func__,
 244                           "Unable to allocate space for %d partition maps",
 245                           count);
 246                 sbi->s_partitions = 0;
 247                 return -ENOMEM;
 248         }
 249
 250         sbi->s_partitions = count;
 251         return 0;
 252 }
 253
 254 static int udf_show_options(struct seq_file *seq, struct vfsmount *mnt)
 255 {
 256         struct super_block *sb = mnt->mnt_sb;
 257         struct udf_sb_info *sbi = UDF_SB(sb);
 258
 259         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
 260                 seq_puts(seq, ",nostrict");
 261         if (sb->s_blocksize != UDF_DEFAULT_BLOCKSIZE)
 262                 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
 263         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
 264                 seq_puts(seq, ",unhide");
 265         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
 266                 seq_puts(seq, ",undelete");
 267         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
 268                 seq_puts(seq, ",noadinicb");
 269         if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
 270                 seq_puts(seq, ",shortad");
 271         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
 272                 seq_puts(seq, ",uid=forget");
 273         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_IGNORE))
 274                 seq_puts(seq, ",uid=ignore");
 275         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
 276                 seq_puts(seq, ",gid=forget");
 277         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE))
 278                 seq_puts(seq, ",gid=ignore");
 279         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
 280                 seq_printf(seq, ",uid=%u", sbi->s_uid);
 281         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
 282                 seq_printf(seq, ",gid=%u", sbi->s_gid);
 283         if (sbi->s_umask != 0)
 284                 seq_printf(seq, ",umask=%o", sbi->s_umask);
 285         if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
 286                 seq_printf(seq, ",session=%u", sbi->s_session);
 287         if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
 288                 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
 289         /*
 290          * s_anchor[2] could be zeroed out in case there is no anchor
 291          * in the specified block, but then the "anchor=N" option
 292          * originally given by the user wasn't effective, so it's OK
 293          * if we don't show it.
 294          */
 295         if (sbi->s_anchor[2] != 0)
 296                 seq_printf(seq, ",anchor=%u", sbi->s_anchor[2]);
 297         /*
 298          * volume, partition, fileset and rootdir seem to be ignored
 299          * currently
 300          */
 301         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
 302                 seq_puts(seq, ",utf8");
 303         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
 304                 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
 305
 306         return 0;
 307 }
 308
 309 /*
 310  * udf_parse_options
 311  *
 312  * PURPOSE
 313  *      Parse mount options.
 314  *
 315  * DESCRIPTION
 316  *      The following mount options are supported:
 317  *
 318  *      gid=            Set the default group.
 319  *      umask=          Set the default umask.
 320  *      uid=            Set the default user.
 321  *      bs=             Set the block size.
 322  *      unhide          Show otherwise hidden files.
 323  *      undelete        Show deleted files in lists.
 324  *      adinicb         Embed data in the inode (default)
 325  *      noadinicb       Don't embed data in the inode
 326  *      shortad         Use short ad's
 327  *      longad          Use long ad's (default)
 328  *      nostrict        Unset strict conformance
 329  *      iocharset=      Set the NLS character set
 330  *
 331  *      The remaining are for debugging and disaster recovery:
 332  *
 333  *      novrs           Skip volume sequence recognition
 334  *
 335  *      The following expect a offset from 0.
 336  *
 337  *      session=        Set the CDROM session (default= last session)
 338  *      anchor=         Override standard anchor location. (default= 256)
 339  *      volume=         Override the VolumeDesc location. (unused)
 340  *      partition=      Override the PartitionDesc location. (unused)
 341  *      lastblock=      Set the last block of the filesystem/
 342  *
 343  *      The following expect a offset from the partition root.
 344  *
 345  *      fileset=        Override the fileset block location. (unused)
 346  *      rootdir=        Override the root directory location. (unused)
 347  *              WARNING: overriding the rootdir to a non-directory may
 348  *              yield highly unpredictable results.
 349  *
 350  * PRE-CONDITIONS
 351  *      options         Pointer to mount options string.
 352  *      uopts           Pointer to mount options variable.
 353  *
 354  * POST-CONDITIONS
 355  *      <return>        1       Mount options parsed okay.
 356  *      <return>        0       Error parsing mount options.
 357  *
 358  * HISTORY
 359  *      July 1, 1997 - Andrew E. Mileski
 360  *      Written, tested, and released.
 361  */
 362
 363 enum {
 364         Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
 365         Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
 366         Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
 367         Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
 368         Opt_rootdir, Opt_utf8, Opt_iocharset,
 369         Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore
 370 };
 371
 372 static match_table_t tokens = {
 373         {Opt_novrs,     "novrs"},
 374         {Opt_nostrict,  "nostrict"},
 375         {Opt_bs,        "bs=%u"},
 376         {Opt_unhide,    "unhide"},
 377         {Opt_undelete,  "undelete"},
 378         {Opt_noadinicb, "noadinicb"},
 379         {Opt_adinicb,   "adinicb"},
 380         {Opt_shortad,   "shortad"},
 381         {Opt_longad,    "longad"},
 382         {Opt_uforget,   "uid=forget"},
 383         {Opt_uignore,   "uid=ignore"},
 384         {Opt_gforget,   "gid=forget"},
 385         {Opt_gignore,   "gid=ignore"},
 386         {Opt_gid,       "gid=%u"},
 387         {Opt_uid,       "uid=%u"},
 388         {Opt_umask,     "umask=%o"},
 389         {Opt_session,   "session=%u"},
 390         {Opt_lastblock, "lastblock=%u"},
 391         {Opt_anchor,    "anchor=%u"},
 392         {Opt_volume,    "volume=%u"},
 393         {Opt_partition, "partition=%u"},
 394         {Opt_fileset,   "fileset=%u"},
 395         {Opt_rootdir,   "rootdir=%u"},
 396         {Opt_utf8,      "utf8"},
 397         {Opt_iocharset, "iocharset=%s"},
 398         {Opt_err,       NULL}
 399 };
 400
 401 static int udf_parse_options(char *options, struct udf_options *uopt,
 402                              bool remount)
 403 {
 404         char *p;
 405         int option;
 406
 407         uopt->novrs = 0;
 408         uopt->blocksize = UDF_DEFAULT_BLOCKSIZE;
 409         uopt->partition = 0xFFFF;
 410         uopt->session = 0xFFFFFFFF;
 411         uopt->lastblock = 0;
 412         uopt->anchor = 0;
 413         uopt->volume = 0xFFFFFFFF;
 414         uopt->rootdir = 0xFFFFFFFF;
 415         uopt->fileset = 0xFFFFFFFF;
 416         uopt->nls_map = NULL;
 417
 418         if (!options)
 419                 return 1;
 420
 421         while ((p = strsep(&options, ",")) != NULL) {
 422                 substring_t args[MAX_OPT_ARGS];
 423                 int token;
 424                 if (!*p)
 425                         continue;
 426
 427                 token = match_token(p, tokens, args);
 428                 switch (token) {
 429                 case Opt_novrs:
 430                         uopt->novrs = 1;
 431                 case Opt_bs:
 432                         if (match_int(&args[0], &option))
 433                                 return 0;
 434                         uopt->blocksize = option;
 435                         break;
 436                 case Opt_unhide:
 437                         uopt->flags |= (1 << UDF_FLAG_UNHIDE);
 438                         break;
 439                 case Opt_undelete:
 440                         uopt->flags |= (1 << UDF_FLAG_UNDELETE);
 441                         break;
 442                 case Opt_noadinicb:
 443                         uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
 444                         break;
 445                 case Opt_adinicb:
 446                         uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
 447                         break;
 448                 case Opt_shortad:
 449                         uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
 450                         break;
 451                 case Opt_longad:
 452                         uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
 453                         break;
 454                 case Opt_gid:
 455                         if (match_int(args, &option))
 456                                 return 0;
 457                         uopt->gid = option;
 458                         uopt->flags |= (1 << UDF_FLAG_GID_SET);
 459                         break;
 460                 case Opt_uid:
 461                         if (match_int(args, &option))
 462                                 return 0;
 463                         uopt->uid = option;
 464                         uopt->flags |= (1 << UDF_FLAG_UID_SET);
 465                         break;
 466                 case Opt_umask:
 467                         if (match_octal(args, &option))
 468                                 return 0;
 469                         uopt->umask = option;
 470                         break;
 471                 case Opt_nostrict:
 472                         uopt->flags &= ~(1 << UDF_FLAG_STRICT);
 473                         break;
 474                 case Opt_session:
 475                         if (match_int(args, &option))
 476                                 return 0;
 477                         uopt->session = option;
 478                         if (!remount)
 479                                 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
 480                         break;
 481                 case Opt_lastblock:
 482                         if (match_int(args, &option))
 483                                 return 0;
 484                         uopt->lastblock = option;
 485                         if (!remount)
 486                                 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
 487                         break;
 488                 case Opt_anchor:
 489                         if (match_int(args, &option))
 490                                 return 0;
 491                         uopt->anchor = option;
 492                         break;
 493                 case Opt_volume:
 494                         if (match_int(args, &option))
 495                                 return 0;
 496                         uopt->volume = option;
 497                         break;
 498                 case Opt_partition:
 499                         if (match_int(args, &option))
 500                                 return 0;
 501                         uopt->partition = option;
 502                         break;
 503                 case Opt_fileset:
 504                         if (match_int(args, &option))
 505                                 return 0;
 506                         uopt->fileset = option;
 507                         break;
 508                 case Opt_rootdir:
 509                         if (match_int(args, &option))
 510                                 return 0;
 511                         uopt->rootdir = option;
 512                         break;
 513                 case Opt_utf8:
 514                         uopt->flags |= (1 << UDF_FLAG_UTF8);
 515                         break;
 516 #ifdef CONFIG_UDF_NLS
 517                 case Opt_iocharset:
 518                         uopt->nls_map = load_nls(args[0].from);
 519                         uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
 520                         break;
 521 #endif
 522                 case Opt_uignore:
 523                         uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
 524                         break;
 525                 case Opt_uforget:
 526                         uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
 527                         break;
 528                 case Opt_gignore:
 529                         uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
 530                         break;
 531                 case Opt_gforget:
 532                         uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
 533                         break;
 534                 default:
 535                         printk(KERN_ERR "udf: bad mount option \"%s\" "
 536                                "or missing value\n", p);
 537                         return 0;
 538                 }
 539         }
 540         return 1;
 541 }
 542
 543 static void udf_write_super(struct super_block *sb)
 544 {
 545         lock_kernel();
 546
 547         if (!(sb->s_flags & MS_RDONLY))
 548                 udf_open_lvid(sb);
 549         sb->s_dirt = 0;
 550
 551         unlock_kernel();
 552 }
 553
 554 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
 555 {
 556         struct udf_options uopt;
 557         struct udf_sb_info *sbi = UDF_SB(sb);
 558
 559         uopt.flags = sbi->s_flags;
 560         uopt.uid   = sbi->s_uid;
 561         uopt.gid   = sbi->s_gid;
 562         uopt.umask = sbi->s_umask;
 563
 564         if (!udf_parse_options(options, &uopt, true))
 565                 return -EINVAL;
 566
 567         sbi->s_flags = uopt.flags;
 568         sbi->s_uid   = uopt.uid;
 569         sbi->s_gid   = uopt.gid;
 570         sbi->s_umask = uopt.umask;
 571
 572         if (sbi->s_lvid_bh) {
 573                 int write_rev = le16_to_cpu(udf_sb_lvidiu(sbi)->minUDFWriteRev);
 574                 if (write_rev > UDF_MAX_WRITE_VERSION)
 575                         *flags |= MS_RDONLY;
 576         }
 577
 578         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 579                 return 0;
 580         if (*flags & MS_RDONLY)
 581                 udf_close_lvid(sb);
 582         else
 583                 udf_open_lvid(sb);
 584
 585         return 0;
 586 }
 587
 588 static int udf_vrs(struct super_block *sb, int silent)
 589 {
 590         struct volStructDesc *vsd = NULL;
 591         loff_t sector = 32768;
 592         int sectorsize;
 593         struct buffer_head *bh = NULL;
 594         int iso9660 = 0;
 595         int nsr02 = 0;
 596         int nsr03 = 0;
 597         struct udf_sb_info *sbi;
 598
 599         /* Block size must be a multiple of 512 */
 600         if (sb->s_blocksize & 511)
 601                 return 0;
 602         sbi = UDF_SB(sb);
 603
 604         if (sb->s_blocksize < sizeof(struct volStructDesc))
 605                 sectorsize = sizeof(struct volStructDesc);
 606         else
 607                 sectorsize = sb->s_blocksize;
 608
 609         sector += (sbi->s_session << sb->s_blocksize_bits);
 610
 611         udf_debug("Starting at sector %u (%ld byte sectors)\n",
 612                   (unsigned int)(sector >> sb->s_blocksize_bits),
 613                   sb->s_blocksize);
 614         /* Process the sequence (if applicable) */
 615         for (; !nsr02 && !nsr03; sector += sectorsize) {
 616                 /* Read a block */
 617                 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
 618                 if (!bh)
 619                         break;
 620
 621                 /* Look for ISO  descriptors */
 622                 vsd = (struct volStructDesc *)(bh->b_data +
 623                                               (sector & (sb->s_blocksize - 1)));
 624
 625                 if (vsd->stdIdent[0] == 0) {
 626                         brelse(bh);
 627                         break;
 628                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
 629                                     VSD_STD_ID_LEN)) {
 630                         iso9660 = sector;
 631                         switch (vsd->structType) {
 632                         case 0:
 633                                 udf_debug("ISO9660 Boot Record found\n");
 634                                 break;
 635                         case 1:
 636                                 udf_debug("ISO9660 Primary Volume Descriptor "
 637                                           "found\n");
 638                                 break;
 639                         case 2:
 640                                 udf_debug("ISO9660 Supplementary Volume "
 641                                           "Descriptor found\n");
 642                                 break;
 643                         case 3:
 644                                 udf_debug("ISO9660 Volume Partition Descriptor "
 645                                           "found\n");
 646                                 break;
 647                         case 255:
 648                                 udf_debug("ISO9660 Volume Descriptor Set "
 649                                           "Terminator found\n");
 650                                 break;
 651                         default:
 652                                 udf_debug("ISO9660 VRS (%u) found\n",
 653                                           vsd->structType);
 654                                 break;
 655                         }
 656                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
 657                                     VSD_STD_ID_LEN))
 658                         ; /* nothing */
 659                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
 660                                     VSD_STD_ID_LEN)) {
 661                         brelse(bh);
 662                         break;
 663                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
 664                                     VSD_STD_ID_LEN))
 665                         nsr02 = sector;
 666                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
 667                                     VSD_STD_ID_LEN))
 668                         nsr03 = sector;
 669                 brelse(bh);
 670         }
 671
 672         if (nsr03)
 673                 return nsr03;
 674         else if (nsr02)
 675                 return nsr02;
 676         else if (sector - (sbi->s_session << sb->s_blocksize_bits) == 32768)
 677                 return -1;
 678         else
 679                 return 0;
 680 }
 681
 682 /*
 683  * Check whether there is an anchor block in the given block
 684  */
 685 static int udf_check_anchor_block(struct super_block *sb, sector_t block)
 686 {
 687         struct buffer_head *bh;
 688         uint16_t ident;
 689
 690         if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
 691             udf_fixed_to_variable(block) >=
 692             sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits)
 693                 return 0;
 694
 695         bh = udf_read_tagged(sb, block, block, &ident);
 696         if (!bh)
 697                 return 0;
 698         brelse(bh);
 699
 700         return ident == TAG_IDENT_AVDP;
 701 }
 702
 703 /* Search for an anchor volume descriptor pointer */
 704 static sector_t udf_scan_anchors(struct super_block *sb, sector_t lastblock)
 705 {
 706         sector_t last[6];
 707         int i;
 708         struct udf_sb_info *sbi = UDF_SB(sb);
 709
 710         last[0] = lastblock;
 711         last[1] = last[0] - 1;
 712         last[2] = last[0] + 1;
 713         last[3] = last[0] - 2;
 714         last[4] = last[0] - 150;
 715         last[5] = last[0] - 152;
 716
 717         /*  according to spec, anchor is in either:
 718          *     block 256
 719          *     lastblock-256
 720          *     lastblock
 721          *  however, if the disc isn't closed, it could be 512 */
 722
 723         for (i = 0; i < ARRAY_SIZE(last); i++) {
 724                 if (last[i] < 0)
 725                         continue;
 726                 if (last[i] >= sb->s_bdev->bd_inode->i_size >>
 727                                 sb->s_blocksize_bits)
 728                         continue;
 729
 730                 if (udf_check_anchor_block(sb, last[i])) {
 731                         sbi->s_anchor[0] = last[i];
 732                         sbi->s_anchor[1] = last[i] - 256;
 733                         return last[i];
 734                 }
 735
 736                 if (last[i] < 256)
 737                         continue;
 738
 739                 if (udf_check_anchor_block(sb, last[i] - 256)) {
 740                         sbi->s_anchor[1] = last[i] - 256;
 741                         return last[i];
 742                 }
 743         }
 744
 745         if (udf_check_anchor_block(sb, sbi->s_session + 256)) {
 746                 sbi->s_anchor[0] = sbi->s_session + 256;
 747                 return last[0];
 748         }
 749         if (udf_check_anchor_block(sb, sbi->s_session + 512)) {
 750                 sbi->s_anchor[0] = sbi->s_session + 512;
 751                 return last[0];
 752         }
 753         return 0;
 754 }
 755
 756 /*
 757  * Find an anchor volume descriptor. The function expects sbi->s_lastblock to
 758  * be the last block on the media.
 759  *
 760  * Return 1 if not found, 0 if ok
 761  *
 762  */
 763 static void udf_find_anchor(struct super_block *sb)
 764 {
 765         sector_t lastblock;
 766         struct buffer_head *bh = NULL;
 767         uint16_t ident;
 768         int i;
 769         struct udf_sb_info *sbi = UDF_SB(sb);
 770
 771         lastblock = udf_scan_anchors(sb, sbi->s_last_block);
 772         if (lastblock)
 773                 goto check_anchor;
 774
 775         /* No anchor found? Try VARCONV conversion of block numbers */
 776         UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
 777         /* Firstly, we try to not convert number of the last block */
 778         lastblock = udf_scan_anchors(sb,
 779                                 udf_variable_to_fixed(sbi->s_last_block));
 780         if (lastblock)
 781                 goto check_anchor;
 782
 783         /* Secondly, we try with converted number of the last block */
 784         lastblock = udf_scan_anchors(sb, sbi->s_last_block);
 785         if (!lastblock) {
 786                 /* VARCONV didn't help. Clear it. */
 787                 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
 788         }
 789
 790 check_anchor:
 791         /*
 792          * Check located anchors and the anchor block supplied via
 793          * mount options
 794          */
 795         for (i = 0; i < ARRAY_SIZE(sbi->s_anchor); i++) {
 796                 if (!sbi->s_anchor[i])
 797                         continue;
 798                 bh = udf_read_tagged(sb, sbi->s_anchor[i],
 799                                         sbi->s_anchor[i], &ident);
 800                 if (!bh)
 801                         sbi->s_anchor[i] = 0;
 802                 else {
 803                         brelse(bh);
 804                         if (ident != TAG_IDENT_AVDP)
 805                                 sbi->s_anchor[i] = 0;
 806                 }
 807         }
 808
 809         sbi->s_last_block = lastblock;
 810 }
 811
 812 static int udf_find_fileset(struct super_block *sb,
 813                             kernel_lb_addr *fileset,
 814                             kernel_lb_addr *root)
 815 {
 816         struct buffer_head *bh = NULL;
 817         long lastblock;
 818         uint16_t ident;
 819         struct udf_sb_info *sbi;
 820
 821         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
 822             fileset->partitionReferenceNum != 0xFFFF) {
 823                 bh = udf_read_ptagged(sb, *fileset, 0, &ident);
 824
 825                 if (!bh) {
 826                         return 1;
 827                 } else if (ident != TAG_IDENT_FSD) {
 828                         brelse(bh);
 829                         return 1;
 830                 }
 831
 832         }
 833
 834         sbi = UDF_SB(sb);
 835         if (!bh) {
 836                 /* Search backwards through the partitions */
 837                 kernel_lb_addr newfileset;
 838
 839 /* --> cvg: FIXME - is it reasonable? */
 840                 return 1;
 841
 842                 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
 843                      (newfileset.partitionReferenceNum != 0xFFFF &&
 844                       fileset->logicalBlockNum == 0xFFFFFFFF &&
 845                       fileset->partitionReferenceNum == 0xFFFF);
 846                      newfileset.partitionReferenceNum--) {
 847                         lastblock = sbi->s_partmaps
 848                                         [newfileset.partitionReferenceNum]
 849                                                 .s_partition_len;
 850                         newfileset.logicalBlockNum = 0;
 851
 852                         do {
 853                                 bh = udf_read_ptagged(sb, newfileset, 0,
 854                                                       &ident);
 855                                 if (!bh) {
 856                                         newfileset.logicalBlockNum++;
 857                                         continue;
 858                                 }
 859
 860                                 switch (ident) {
 861                                 case TAG_IDENT_SBD:
 862                                 {
 863                                         struct spaceBitmapDesc *sp;
 864                                         sp = (struct spaceBitmapDesc *)
 865                                                                 bh->b_data;
 866                                         newfileset.logicalBlockNum += 1 +
 867                                                 ((le32_to_cpu(sp->numOfBytes) +
 868                                                   sizeof(struct spaceBitmapDesc)
 869                                                   - 1) >> sb->s_blocksize_bits);
 870                                         brelse(bh);
 871                                         break;
 872                                 }
 873                                 case TAG_IDENT_FSD:
 874                                         *fileset = newfileset;
 875                                         break;
 876                                 default:
 877                                         newfileset.logicalBlockNum++;
 878                                         brelse(bh);
 879                                         bh = NULL;
 880                                         break;
 881                                 }
 882                         } while (newfileset.logicalBlockNum < lastblock &&
 883                                  fileset->logicalBlockNum == 0xFFFFFFFF &&
 884                                  fileset->partitionReferenceNum == 0xFFFF);
 885                 }
 886         }
 887
 888         if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
 889              fileset->partitionReferenceNum != 0xFFFF) && bh) {
 890                 udf_debug("Fileset at block=%d, partition=%d\n",
 891                           fileset->logicalBlockNum,
 892                           fileset->partitionReferenceNum);
 893
 894                 sbi->s_partition = fileset->partitionReferenceNum;
 895                 udf_load_fileset(sb, bh, root);
 896                 brelse(bh);
 897                 return 0;
 898         }
 899         return 1;
 900 }
 901
 902 static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
 903 {
 904         struct primaryVolDesc *pvoldesc;
 905         struct ustr instr;
 906         struct ustr outstr;
 907         struct buffer_head *bh;
 908         uint16_t ident;
 909
 910         bh = udf_read_tagged(sb, block, block, &ident);
 911         if (!bh)
 912                 return 1;
 913         BUG_ON(ident != TAG_IDENT_PVD);
 914
 915         pvoldesc = (struct primaryVolDesc *)bh->b_data;
 916
 917         if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
 918                               pvoldesc->recordingDateAndTime)) {
 919 #ifdef UDFFS_DEBUG
 920                 timestamp *ts = &pvoldesc->recordingDateAndTime;
 921                 udf_debug("recording time %04u/%02u/%02u"
 922                           " %02u:%02u (%x)\n",
 923                           le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
 924                           ts->minute, le16_to_cpu(ts->typeAndTimezone));
 925 #endif
 926         }
 927
 928         if (!udf_build_ustr(&instr, pvoldesc->volIdent, 32))
 929                 if (udf_CS0toUTF8(&outstr, &instr)) {
 930                         strncpy(UDF_SB(sb)->s_volume_ident, outstr.u_name,
 931                                 outstr.u_len > 31 ? 31 : outstr.u_len);
 932                         udf_debug("volIdent[] = '%s'\n",
 933                                         UDF_SB(sb)->s_volume_ident);
 934                 }
 935
 936         if (!udf_build_ustr(&instr, pvoldesc->volSetIdent, 128))
 937                 if (udf_CS0toUTF8(&outstr, &instr))
 938                         udf_debug("volSetIdent[] = '%s'\n", outstr.u_name);
 939
 940         brelse(bh);
 941         return 0;
 942 }
 943
 944 static int udf_load_metadata_files(struct super_block *sb, int partition)
 945 {
 946         struct udf_sb_info *sbi = UDF_SB(sb);
 947         struct udf_part_map *map;
 948         struct udf_meta_data *mdata;
 949         kernel_lb_addr addr;
 950         int fe_error = 0;
 951
 952         map = &sbi->s_partmaps[partition];
 953         mdata = &map->s_type_specific.s_metadata;
 954
 955         /* metadata address */
 956         addr.logicalBlockNum =  mdata->s_meta_file_loc;
 957         addr.partitionReferenceNum = map->s_partition_num;
 958
 959         udf_debug("Metadata file location: block = %d part = %d\n",
 960                           addr.logicalBlockNum, addr.partitionReferenceNum);
 961
 962         mdata->s_metadata_fe = udf_iget(sb, addr);
 963
 964         if (mdata->s_metadata_fe == NULL) {
 965                 udf_warning(sb, __func__, "metadata inode efe not found, "
 966                                 "will try mirror inode.");
 967                 fe_error = 1;
 968         } else if (UDF_I(mdata->s_metadata_fe)->i_alloc_type !=
 969                  ICBTAG_FLAG_AD_SHORT) {
 970                 udf_warning(sb, __func__, "metadata inode efe does not have "
 971                         "short allocation descriptors!");
 972                 fe_error = 1;
 973                 iput(mdata->s_metadata_fe);
 974                 mdata->s_metadata_fe = NULL;
 975         }
 976
 977         /* mirror file entry */
 978         addr.logicalBlockNum = mdata->s_mirror_file_loc;
 979         addr.partitionReferenceNum = map->s_partition_num;
 980
 981         udf_debug("Mirror metadata file location: block = %d part = %d\n",
 982                           addr.logicalBlockNum, addr.partitionReferenceNum);
 983
 984         mdata->s_mirror_fe = udf_iget(sb, addr);
 985
 986         if (mdata->s_mirror_fe == NULL) {
 987                 if (fe_error) {
 988                         udf_error(sb, __func__, "mirror inode efe not found "
 989                         "and metadata inode is missing too, exiting...");
 990                         goto error_exit;
 991                 } else
 992                         udf_warning(sb, __func__, "mirror inode efe not found,"
 993                                         " but metadata inode is OK");
 994         } else if (UDF_I(mdata->s_mirror_fe)->i_alloc_type !=
 995                  ICBTAG_FLAG_AD_SHORT) {
 996                 udf_warning(sb, __func__, "mirror inode efe does not have "
 997                         "short allocation descriptors!");
 998                 iput(mdata->s_mirror_fe);
 999                 mdata->s_mirror_fe = NULL;
1000                 if (fe_error)
1001                         goto error_exit;
1002         }
1003
1004         /*
1005          * bitmap file entry
1006          * Note:
1007          * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
1008         */
1009         if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
1010                 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
1011                 addr.partitionReferenceNum = map->s_partition_num;
1012
1013                 udf_debug("Bitmap file location: block = %d part = %d\n",
1014                         addr.logicalBlockNum, addr.partitionReferenceNum);
1015
1016                 mdata->s_bitmap_fe = udf_iget(sb, addr);
1017
1018                 if (mdata->s_bitmap_fe == NULL) {
1019                         if (sb->s_flags & MS_RDONLY)
1020                                 udf_warning(sb, __func__, "bitmap inode efe "
1021                                         "not found but it's ok since the disc"
1022                                         " is mounted read-only");
1023                         else {
1024                                 udf_error(sb, __func__, "bitmap inode efe not "
1025                                         "found and attempted read-write mount");
1026                                 goto error_exit;
1027                         }
1028                 }
1029         }
1030
1031         udf_debug("udf_load_metadata_files Ok\n");
1032
1033         return 0;
1034
1035 error_exit:
1036         return 1;
1037 }
1038
1039 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
1040                              kernel_lb_addr *root)
1041 {
1042         struct fileSetDesc *fset;
1043
1044         fset = (struct fileSetDesc *)bh->b_data;
1045
1046         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
1047
1048         UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
1049
1050         udf_debug("Rootdir at block=%d, partition=%d\n",
1051                   root->logicalBlockNum, root->partitionReferenceNum);
1052 }
1053
1054 int udf_compute_nr_groups(struct super_block *sb, u32 partition)
1055 {
1056         struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
1057         return DIV_ROUND_UP(map->s_partition_len +
1058                             (sizeof(struct spaceBitmapDesc) << 3),
1059                             sb->s_blocksize * 8);
1060 }
1061
1062 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
1063 {
1064         struct udf_bitmap *bitmap;
1065         int nr_groups;
1066         int size;
1067
1068         nr_groups = udf_compute_nr_groups(sb, index);
1069         size = sizeof(struct udf_bitmap) +
1070                 (sizeof(struct buffer_head *) * nr_groups);
1071
1072         if (size <= PAGE_SIZE)
1073                 bitmap = kmalloc(size, GFP_KERNEL);
1074         else
1075                 bitmap = vmalloc(size); /* TODO: get rid of vmalloc */
1076
1077         if (bitmap == NULL) {
1078                 udf_error(sb, __func__,
1079                           "Unable to allocate space for bitmap "
1080                           "and %d buffer_head pointers", nr_groups);
1081                 return NULL;
1082         }
1083
1084         memset(bitmap, 0x00, size);
1085         bitmap->s_block_bitmap = (struct buffer_head **)(bitmap + 1);
1086         bitmap->s_nr_groups = nr_groups;
1087         return bitmap;
1088 }
1089
1090 static int udf_fill_partdesc_info(struct super_block *sb,
1091                 struct partitionDesc *p, int p_index)
1092 {
1093         struct udf_part_map *map;
1094         struct udf_sb_info *sbi = UDF_SB(sb);
1095         struct partitionHeaderDesc *phd;
1096
1097         map = &sbi->s_partmaps[p_index];
1098
1099         map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
1100         map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
1101
1102         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
1103                 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
1104         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
1105                 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
1106         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
1107                 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
1108         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
1109                 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
1110
1111         udf_debug("Partition (%d type %x) starts at physical %d, "
1112                   "block length %d\n", p_index,
1113                   map->s_partition_type, map->s_partition_root,
1114                   map->s_partition_len);
1115
1116         if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1117             strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
1118                 return 0;
1119
1120         phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1121         if (phd->unallocSpaceTable.extLength) {
1122                 kernel_lb_addr loc = {
1123                         .logicalBlockNum = le32_to_cpu(
1124                                 phd->unallocSpaceTable.extPosition),
1125                         .partitionReferenceNum = p_index,
1126                 };
1127
1128                 map->s_uspace.s_table = udf_iget(sb, loc);
1129                 if (!map->s_uspace.s_table) {
1130                         udf_debug("cannot load unallocSpaceTable (part %d)\n",
1131                                         p_index);
1132                         return 1;
1133                 }
1134                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1135                 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
1136                                 p_index, map->s_uspace.s_table->i_ino);
1137         }
1138
1139         if (phd->unallocSpaceBitmap.extLength) {
1140                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1141                 if (!bitmap)
1142                         return 1;
1143                 map->s_uspace.s_bitmap = bitmap;
1144                 bitmap->s_extLength = le32_to_cpu(
1145                                 phd->unallocSpaceBitmap.extLength);
1146                 bitmap->s_extPosition = le32_to_cpu(
1147                                 phd->unallocSpaceBitmap.extPosition);
1148                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1149                 udf_debug("unallocSpaceBitmap (part %d) @ %d\n", p_index,
1150                                                 bitmap->s_extPosition);
1151         }
1152
1153         if (phd->partitionIntegrityTable.extLength)
1154                 udf_debug("partitionIntegrityTable (part %d)\n", p_index);
1155
1156         if (phd->freedSpaceTable.extLength) {
1157                 kernel_lb_addr loc = {
1158                         .logicalBlockNum = le32_to_cpu(
1159                                 phd->freedSpaceTable.extPosition),
1160                         .partitionReferenceNum = p_index,
1161                 };
1162
1163                 map->s_fspace.s_table = udf_iget(sb, loc);
1164                 if (!map->s_fspace.s_table) {
1165                         udf_debug("cannot load freedSpaceTable (part %d)\n",
1166                                 p_index);
1167                         return 1;
1168                 }
1169
1170                 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
1171                 udf_debug("freedSpaceTable (part %d) @ %ld\n",
1172                                 p_index, map->s_fspace.s_table->i_ino);
1173         }
1174
1175         if (phd->freedSpaceBitmap.extLength) {
1176                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1177                 if (!bitmap)
1178                         return 1;
1179                 map->s_fspace.s_bitmap = bitmap;
1180                 bitmap->s_extLength = le32_to_cpu(
1181                                 phd->freedSpaceBitmap.extLength);
1182                 bitmap->s_extPosition = le32_to_cpu(
1183                                 phd->freedSpaceBitmap.extPosition);
1184                 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1185                 udf_debug("freedSpaceBitmap (part %d) @ %d\n", p_index,
1186                                         bitmap->s_extPosition);
1187         }
1188         return 0;
1189 }
1190
1191 static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1192 {
1193         struct udf_sb_info *sbi = UDF_SB(sb);
1194         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1195         kernel_lb_addr ino;
1196         struct buffer_head *bh = NULL;
1197         struct udf_inode_info *vati;
1198         uint32_t pos;
1199         struct virtualAllocationTable20 *vat20;
1200
1201         /* VAT file entry is in the last recorded block */
1202         ino.partitionReferenceNum = type1_index;
1203         ino.logicalBlockNum = sbi->s_last_block - map->s_partition_root;
1204         sbi->s_vat_inode = udf_iget(sb, ino);
1205         if (!sbi->s_vat_inode)
1206                 return 1;
1207
1208         if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1209                 map->s_type_specific.s_virtual.s_start_offset = 0;
1210                 map->s_type_specific.s_virtual.s_num_entries =
1211                         (sbi->s_vat_inode->i_size - 36) >> 2;
1212         } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1213                 vati = UDF_I(sbi->s_vat_inode);
1214                 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1215                         pos = udf_block_map(sbi->s_vat_inode, 0);
1216                         bh = sb_bread(sb, pos);
1217                         if (!bh)
1218                                 return 1;
1219                         vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1220                 } else {
1221                         vat20 = (struct virtualAllocationTable20 *)
1222                                                         vati->i_ext.i_data;
1223                 }
1224
1225                 map->s_type_specific.s_virtual.s_start_offset =
1226                         le16_to_cpu(vat20->lengthHeader);
1227                 map->s_type_specific.s_virtual.s_num_entries =
1228                         (sbi->s_vat_inode->i_size -
1229                                 map->s_type_specific.s_virtual.
1230                                         s_start_offset) >> 2;
1231                 brelse(bh);
1232         }
1233         return 0;
1234 }
1235
1236 static int udf_load_partdesc(struct super_block *sb, sector_t block)
1237 {
1238         struct buffer_head *bh;
1239         struct partitionDesc *p;
1240         struct udf_part_map *map;
1241         struct udf_sb_info *sbi = UDF_SB(sb);
1242         int i, type1_idx;
1243         uint16_t partitionNumber;
1244         uint16_t ident;
1245         int ret = 0;
1246
1247         bh = udf_read_tagged(sb, block, block, &ident);
1248         if (!bh)
1249                 return 1;
1250         if (ident != TAG_IDENT_PD)
1251                 goto out_bh;
1252
1253         p = (struct partitionDesc *)bh->b_data;
1254         partitionNumber = le16_to_cpu(p->partitionNumber);
1255
1256         /* First scan for TYPE1, SPARABLE and METADATA partitions */
1257         for (i = 0; i < sbi->s_partitions; i++) {
1258                 map = &sbi->s_partmaps[i];
1259                 udf_debug("Searching map: (%d == %d)\n",
1260                           map->s_partition_num, partitionNumber);
1261                 if (map->s_partition_num == partitionNumber &&
1262                     (map->s_partition_type == UDF_TYPE1_MAP15 ||
1263                      map->s_partition_type == UDF_SPARABLE_MAP15))
1264                         break;
1265         }
1266
1267         if (i >= sbi->s_partitions) {
1268                 udf_debug("Partition (%d) not found in partition map\n",
1269                           partitionNumber);
1270                 goto out_bh;
1271         }
1272
1273         ret = udf_fill_partdesc_info(sb, p, i);
1274
1275         /*
1276          * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1277          * PHYSICAL partitions are already set up
1278          */
1279         type1_idx = i;
1280         for (i = 0; i < sbi->s_partitions; i++) {
1281                 map = &sbi->s_partmaps[i];
1282
1283                 if (map->s_partition_num == partitionNumber &&
1284                     (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1285                      map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1286                      map->s_partition_type == UDF_METADATA_MAP25))
1287                         break;
1288         }
1289
1290         if (i >= sbi->s_partitions)
1291                 goto out_bh;
1292
1293         ret = udf_fill_partdesc_info(sb, p, i);
1294         if (ret)
1295                 goto out_bh;
1296
1297         if (map->s_partition_type == UDF_METADATA_MAP25) {
1298                 ret = udf_load_metadata_files(sb, i);
1299                 if (ret) {
1300                         printk(KERN_ERR "UDF-fs: error loading MetaData "
1301                         "partition map %d\n", i);
1302                         goto out_bh;
1303                 }
1304         } else {
1305                 ret = udf_load_vat(sb, i, type1_idx);
1306                 if (ret)
1307                         goto out_bh;
1308                 /*
1309                  * Mark filesystem read-only if we have a partition with
1310                  * virtual map since we don't handle writing to it (we
1311                  * overwrite blocks instead of relocating them).
1312                  */
1313                 sb->s_flags |= MS_RDONLY;
1314                 printk(KERN_NOTICE "UDF-fs: Filesystem marked read-only "
1315                         "because writing to pseudooverwrite partition is "
1316                         "not implemented.\n");
1317         }
1318 out_bh:
1319         /* In case loading failed, we handle cleanup in udf_fill_super */
1320         brelse(bh);
1321         return ret;
1322 }
1323
1324 static int udf_load_logicalvol(struct super_block *sb, sector_t block,
1325                                kernel_lb_addr *fileset)
1326 {
1327         struct logicalVolDesc *lvd;
1328         int i, j, offset;
1329         uint8_t type;
1330         struct udf_sb_info *sbi = UDF_SB(sb);
1331         struct genericPartitionMap *gpm;
1332         uint16_t ident;
1333         struct buffer_head *bh;
1334         int ret = 0;
1335
1336         bh = udf_read_tagged(sb, block, block, &ident);
1337         if (!bh)
1338                 return 1;
1339         BUG_ON(ident != TAG_IDENT_LVD);
1340         lvd = (struct logicalVolDesc *)bh->b_data;
1341
1342         i = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1343         if (i != 0) {
1344                 ret = i;
1345                 goto out_bh;
1346         }
1347
1348         for (i = 0, offset = 0;
1349              i < sbi->s_partitions && offset < le32_to_cpu(lvd->mapTableLength);
1350              i++, offset += gpm->partitionMapLength) {
1351                 struct udf_part_map *map = &sbi->s_partmaps[i];
1352                 gpm = (struct genericPartitionMap *)
1353                                 &(lvd->partitionMaps[offset]);
1354                 type = gpm->partitionMapType;
1355                 if (type == 1) {
1356                         struct genericPartitionMap1 *gpm1 =
1357                                 (struct genericPartitionMap1 *)gpm;
1358                         map->s_partition_type = UDF_TYPE1_MAP15;
1359                         map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1360                         map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1361                         map->s_partition_func = NULL;
1362                 } else if (type == 2) {
1363                         struct udfPartitionMap2 *upm2 =
1364                                                 (struct udfPartitionMap2 *)gpm;
1365                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1366                                                 strlen(UDF_ID_VIRTUAL))) {
1367                                 u16 suf =
1368                                         le16_to_cpu(((__le16 *)upm2->partIdent.
1369                                                         identSuffix)[0]);
1370                                 if (suf < 0x0200) {
1371                                         map->s_partition_type =
1372                                                         UDF_VIRTUAL_MAP15;
1373                                         map->s_partition_func =
1374                                                         udf_get_pblock_virt15;
1375                                 } else {
1376                                         map->s_partition_type =
1377                                                         UDF_VIRTUAL_MAP20;
1378                                         map->s_partition_func =
1379                                                         udf_get_pblock_virt20;
1380                                 }
1381                         } else if (!strncmp(upm2->partIdent.ident,
1382                                                 UDF_ID_SPARABLE,
1383                                                 strlen(UDF_ID_SPARABLE))) {
1384                                 uint32_t loc;
1385                                 struct sparingTable *st;
1386                                 struct sparablePartitionMap *spm =
1387                                         (struct sparablePartitionMap *)gpm;
1388
1389                                 map->s_partition_type = UDF_SPARABLE_MAP15;
1390                                 map->s_type_specific.s_sparing.s_packet_len =
1391                                                 le16_to_cpu(spm->packetLength);
1392                                 for (j = 0; j < spm->numSparingTables; j++) {
1393                                         struct buffer_head *bh2;
1394
1395                                         loc = le32_to_cpu(
1396                                                 spm->locSparingTable[j]);
1397                                         bh2 = udf_read_tagged(sb, loc, loc,
1398                                                              &ident);
1399                                         map->s_type_specific.s_sparing.
1400                                                         s_spar_map[j] = bh2;
1401
1402                                         if (bh2 == NULL)
1403                                                 continue;
1404
1405                                         st = (struct sparingTable *)bh2->b_data;
1406                                         if (ident != 0 || strncmp(
1407                                                 st->sparingIdent.ident,
1408                                                 UDF_ID_SPARING,
1409                                                 strlen(UDF_ID_SPARING))) {
1410                                                 brelse(bh2);
1411                                                 map->s_type_specific.s_sparing.
1412                                                         s_spar_map[j] = NULL;
1413                                         }
1414                                 }
1415                                 map->s_partition_func = udf_get_pblock_spar15;
1416                         } else if (!strncmp(upm2->partIdent.ident,
1417                                                 UDF_ID_METADATA,
1418                                                 strlen(UDF_ID_METADATA))) {
1419                                 struct udf_meta_data *mdata =
1420                                         &map->s_type_specific.s_metadata;
1421                                 struct metadataPartitionMap *mdm =
1422                                                 (struct metadataPartitionMap *)
1423                                                 &(lvd->partitionMaps[offset]);
1424                                 udf_debug("Parsing Logical vol part %d "
1425                                         "type %d  id=%s\n", i, type,
1426                                         UDF_ID_METADATA);
1427
1428                                 map->s_partition_type = UDF_METADATA_MAP25;
1429                                 map->s_partition_func = udf_get_pblock_meta25;
1430
1431                                 mdata->s_meta_file_loc   =
1432                                         le32_to_cpu(mdm->metadataFileLoc);
1433                                 mdata->s_mirror_file_loc =
1434                                         le32_to_cpu(mdm->metadataMirrorFileLoc);
1435                                 mdata->s_bitmap_file_loc =
1436                                         le32_to_cpu(mdm->metadataBitmapFileLoc);
1437                                 mdata->s_alloc_unit_size =
1438                                         le32_to_cpu(mdm->allocUnitSize);
1439                                 mdata->s_align_unit_size =
1440                                         le16_to_cpu(mdm->alignUnitSize);
1441                                 mdata->s_dup_md_flag     =
1442                                         mdm->flags & 0x01;
1443
1444                                 udf_debug("Metadata Ident suffix=0x%x\n",
1445                                         (le16_to_cpu(
1446                                          ((__le16 *)
1447                                               mdm->partIdent.identSuffix)[0])));
1448                                 udf_debug("Metadata part num=%d\n",
1449                                         le16_to_cpu(mdm->partitionNum));
1450                                 udf_debug("Metadata part alloc unit size=%d\n",
1451                                         le32_to_cpu(mdm->allocUnitSize));
1452                                 udf_debug("Metadata file loc=%d\n",
1453                                         le32_to_cpu(mdm->metadataFileLoc));
1454                                 udf_debug("Mirror file loc=%d\n",
1455                                        le32_to_cpu(mdm->metadataMirrorFileLoc));
1456                                 udf_debug("Bitmap file loc=%d\n",
1457                                        le32_to_cpu(mdm->metadataBitmapFileLoc));
1458                                 udf_debug("Duplicate Flag: %d %d\n",
1459                                         mdata->s_dup_md_flag, mdm->flags);
1460                         } else {
1461                                 udf_debug("Unknown ident: %s\n",
1462                                           upm2->partIdent.ident);
1463                                 continue;
1464                         }
1465                         map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1466                         map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1467                 }
1468                 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1469                           i, map->s_partition_num, type,
1470                           map->s_volumeseqnum);
1471         }
1472
1473         if (fileset) {
1474                 long_ad *la = (long_ad *)&(lvd->logicalVolContentsUse[0]);
1475
1476                 *fileset = lelb_to_cpu(la->extLocation);
1477                 udf_debug("FileSet found in LogicalVolDesc at block=%d, "
1478                           "partition=%d\n", fileset->logicalBlockNum,
1479                           fileset->partitionReferenceNum);
1480         }
1481         if (lvd->integritySeqExt.extLength)
1482                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1483
1484 out_bh:
1485         brelse(bh);
1486         return ret;
1487 }
1488
1489 /*
1490  * udf_load_logicalvolint
1491  *
1492  */
1493 static void udf_load_logicalvolint(struct super_block *sb, kernel_extent_ad loc)
1494 {
1495         struct buffer_head *bh = NULL;
1496         uint16_t ident;
1497         struct udf_sb_info *sbi = UDF_SB(sb);
1498         struct logicalVolIntegrityDesc *lvid;
1499
1500         while (loc.extLength > 0 &&
1501                (bh = udf_read_tagged(sb, loc.extLocation,
1502                                      loc.extLocation, &ident)) &&
1503                ident == TAG_IDENT_LVID) {
1504                 sbi->s_lvid_bh = bh;
1505                 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1506
1507                 if (lvid->nextIntegrityExt.extLength)
1508                         udf_load_logicalvolint(sb,
1509                                 leea_to_cpu(lvid->nextIntegrityExt));
1510
1511                 if (sbi->s_lvid_bh != bh)
1512                         brelse(bh);
1513                 loc.extLength -= sb->s_blocksize;
1514                 loc.extLocation++;
1515         }
1516         if (sbi->s_lvid_bh != bh)
1517                 brelse(bh);
1518 }
1519
1520 /*
1521  * udf_process_sequence
1522  *
1523  * PURPOSE
1524  *      Process a main/reserve volume descriptor sequence.
1525  *
1526  * PRE-CONDITIONS
1527  *      sb                      Pointer to _locked_ superblock.
1528  *      block                   First block of first extent of the sequence.
1529  *      lastblock               Lastblock of first extent of the sequence.
1530  *
1531  * HISTORY
1532  *      July 1, 1997 - Andrew E. Mileski
1533  *      Written, tested, and released.
1534  */
1535 static noinline int udf_process_sequence(struct super_block *sb, long block,
1536                                 long lastblock, kernel_lb_addr *fileset)
1537 {
1538         struct buffer_head *bh = NULL;
1539         struct udf_vds_record vds[VDS_POS_LENGTH];
1540         struct udf_vds_record *curr;
1541         struct generic_desc *gd;
1542         struct volDescPtr *vdp;
1543         int done = 0;
1544         uint32_t vdsn;
1545         uint16_t ident;
1546         long next_s = 0, next_e = 0;
1547
1548         memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1549
1550         /*
1551          * Read the main descriptor sequence and find which descriptors
1552          * are in it.
1553          */
1554         for (; (!done && block <= lastblock); block++) {
1555
1556                 bh = udf_read_tagged(sb, block, block, &ident);
1557                 if (!bh) {
1558                         printk(KERN_ERR "udf: Block %Lu of volume descriptor "
1559                                "sequence is corrupted or we could not read "
1560                                "it.\n", (unsigned long long)block);
1561                         return 1;
1562                 }
1563
1564                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1565                 gd = (struct generic_desc *)bh->b_data;
1566                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1567                 switch (ident) {
1568                 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1569                         curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1570                         if (vdsn >= curr->volDescSeqNum) {
1571                                 curr->volDescSeqNum = vdsn;
1572                                 curr->block = block;
1573                         }
1574                         break;
1575                 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1576                         curr = &vds[VDS_POS_VOL_DESC_PTR];
1577                         if (vdsn >= curr->volDescSeqNum) {
1578                                 curr->volDescSeqNum = vdsn;
1579                                 curr->block = block;
1580
1581                                 vdp = (struct volDescPtr *)bh->b_data;
1582                                 next_s = le32_to_cpu(
1583                                         vdp->nextVolDescSeqExt.extLocation);
1584                                 next_e = le32_to_cpu(
1585                                         vdp->nextVolDescSeqExt.extLength);
1586                                 next_e = next_e >> sb->s_blocksize_bits;
1587                                 next_e += next_s;
1588                         }
1589                         break;
1590                 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1591                         curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1592                         if (vdsn >= curr->volDescSeqNum) {
1593                                 curr->volDescSeqNum = vdsn;
1594                                 curr->block = block;
1595                         }
1596                         break;
1597                 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1598                         curr = &vds[VDS_POS_PARTITION_DESC];
1599                         if (!curr->block)
1600                                 curr->block = block;
1601                         break;
1602                 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1603                         curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1604                         if (vdsn >= curr->volDescSeqNum) {
1605                                 curr->volDescSeqNum = vdsn;
1606                                 curr->block = block;
1607                         }
1608                         break;
1609                 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1610                         curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1611                         if (vdsn >= curr->volDescSeqNum) {
1612                                 curr->volDescSeqNum = vdsn;
1613                                 curr->block = block;
1614                         }
1615                         break;
1616                 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1617                         vds[VDS_POS_TERMINATING_DESC].block = block;
1618                         if (next_e) {
1619                                 block = next_s;
1620                                 lastblock = next_e;
1621                                 next_s = next_e = 0;
1622                         } else
1623                                 done = 1;
1624                         break;
1625                 }
1626                 brelse(bh);
1627         }
1628         /*
1629          * Now read interesting descriptors again and process them
1630          * in a suitable order
1631          */
1632         if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1633                 printk(KERN_ERR "udf: Primary Volume Descriptor not found!\n");
1634                 return 1;
1635         }
1636         if (udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block))
1637                 return 1;
1638
1639         if (vds[VDS_POS_LOGICAL_VOL_DESC].block && udf_load_logicalvol(sb,
1640             vds[VDS_POS_LOGICAL_VOL_DESC].block, fileset))
1641                 return 1;
1642
1643         if (vds[VDS_POS_PARTITION_DESC].block) {
1644                 /*
1645                  * We rescan the whole descriptor sequence to find
1646                  * partition descriptor blocks and process them.
1647                  */
1648                 for (block = vds[VDS_POS_PARTITION_DESC].block;
1649                      block < vds[VDS_POS_TERMINATING_DESC].block;
1650                      block++)
1651                         if (udf_load_partdesc(sb, block))
1652                                 return 1;
1653         }
1654
1655         return 0;
1656 }
1657
1658 /*
1659  * udf_check_valid()
1660  */
1661 static int udf_check_valid(struct super_block *sb, int novrs, int silent)
1662 {
1663         long block;
1664         struct udf_sb_info *sbi = UDF_SB(sb);
1665
1666         if (novrs) {
1667                 udf_debug("Validity check skipped because of novrs option\n");
1668                 return 0;
1669         }
1670         /* Check that it is NSR02 compliant */
1671         /* Process any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
1672         block = udf_vrs(sb, silent);
1673         if (block == -1)
1674                 udf_debug("Failed to read byte 32768. Assuming open "
1675                           "disc. Skipping validity check\n");
1676         if (block && !sbi->s_last_block)
1677                 sbi->s_last_block = udf_get_last_block(sb);
1678         return !block;
1679 }
1680
1681 static int udf_load_sequence(struct super_block *sb, kernel_lb_addr *fileset)
1682 {
1683         struct anchorVolDescPtr *anchor;
1684         uint16_t ident;
1685         struct buffer_head *bh;
1686         long main_s, main_e, reserve_s, reserve_e;
1687         int i;
1688         struct udf_sb_info *sbi;
1689
1690         if (!sb)
1691                 return 1;
1692         sbi = UDF_SB(sb);
1693
1694         for (i = 0; i < ARRAY_SIZE(sbi->s_anchor); i++) {
1695                 if (!sbi->s_anchor[i])
1696                         continue;
1697
1698                 bh = udf_read_tagged(sb, sbi->s_anchor[i], sbi->s_anchor[i],
1699                                      &ident);
1700                 if (!bh)
1701                         continue;
1702
1703                 anchor = (struct anchorVolDescPtr *)bh->b_data;
1704
1705                 /* Locate the main sequence */
1706                 main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1707                 main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1708                 main_e = main_e >> sb->s_blocksize_bits;
1709                 main_e += main_s;
1710
1711                 /* Locate the reserve sequence */
1712                 reserve_s = le32_to_cpu(
1713                                 anchor->reserveVolDescSeqExt.extLocation);
1714                 reserve_e = le32_to_cpu(
1715                                 anchor->reserveVolDescSeqExt.extLength);
1716                 reserve_e = reserve_e >> sb->s_blocksize_bits;
1717                 reserve_e += reserve_s;
1718
1719                 brelse(bh);
1720
1721                 /* Process the main & reserve sequences */
1722                 /* responsible for finding the PartitionDesc(s) */
1723                 if (!(udf_process_sequence(sb, main_s, main_e,
1724                                            fileset) &&
1725                       udf_process_sequence(sb, reserve_s, reserve_e,
1726                                            fileset)))
1727                         break;
1728         }
1729
1730         if (i == ARRAY_SIZE(sbi->s_anchor)) {
1731                 udf_debug("No Anchor block found\n");
1732                 return 1;
1733         }
1734         udf_debug("Using anchor in block %d\n", sbi->s_anchor[i]);
1735
1736         return 0;
1737 }
1738
1739 static void udf_open_lvid(struct super_block *sb)
1740 {
1741         struct udf_sb_info *sbi = UDF_SB(sb);
1742         struct buffer_head *bh = sbi->s_lvid_bh;
1743         struct logicalVolIntegrityDesc *lvid;
1744         struct logicalVolIntegrityDescImpUse *lvidiu;
1745         if (!bh)
1746                 return;
1747
1748         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1749         lvidiu = udf_sb_lvidiu(sbi);
1750
1751         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1752         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1753         udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
1754                                 CURRENT_TIME);
1755         lvid->integrityType = LVID_INTEGRITY_TYPE_OPEN;
1756
1757         lvid->descTag.descCRC = cpu_to_le16(
1758                 crc_itu_t(0, (char *)lvid + sizeof(tag),
1759                         le16_to_cpu(lvid->descTag.descCRCLength)));
1760
1761         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1762         mark_buffer_dirty(bh);
1763 }
1764
1765 static void udf_close_lvid(struct super_block *sb)
1766 {
1767         struct udf_sb_info *sbi = UDF_SB(sb);
1768         struct buffer_head *bh = sbi->s_lvid_bh;
1769         struct logicalVolIntegrityDesc *lvid;
1770         struct logicalVolIntegrityDescImpUse *lvidiu;
1771
1772         if (!bh)
1773                 return;
1774
1775         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1776
1777         if (lvid->integrityType != LVID_INTEGRITY_TYPE_OPEN)
1778                 return;
1779
1780         lvidiu = udf_sb_lvidiu(sbi);
1781         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1782         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1783         udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
1784         if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1785                 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1786         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1787                 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1788         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
1789                 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
1790         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1791
1792         lvid->descTag.descCRC = cpu_to_le16(
1793                         crc_itu_t(0, (char *)lvid + sizeof(tag),
1794                                 le16_to_cpu(lvid->descTag.descCRCLength)));
1795
1796         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1797         mark_buffer_dirty(bh);
1798 }
1799
1800 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
1801 {
1802         int i;
1803         int nr_groups = bitmap->s_nr_groups;
1804         int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
1805                                                 nr_groups);
1806
1807         for (i = 0; i < nr_groups; i++)
1808                 if (bitmap->s_block_bitmap[i])
1809                         brelse(bitmap->s_block_bitmap[i]);
1810
1811         if (size <= PAGE_SIZE)
1812                 kfree(bitmap);
1813         else
1814                 vfree(bitmap);
1815 }
1816
1817 static void udf_free_partition(struct udf_part_map *map)
1818 {
1819         int i;
1820         struct udf_meta_data *mdata;
1821
1822         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1823                 iput(map->s_uspace.s_table);
1824         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1825                 iput(map->s_fspace.s_table);
1826         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1827                 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
1828         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1829                 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
1830         if (map->s_partition_type == UDF_SPARABLE_MAP15)
1831                 for (i = 0; i < 4; i++)
1832                         brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
1833         else if (map->s_partition_type == UDF_METADATA_MAP25) {
1834                 mdata = &map->s_type_specific.s_metadata;
1835                 iput(mdata->s_metadata_fe);
1836                 mdata->s_metadata_fe = NULL;
1837
1838                 iput(mdata->s_mirror_fe);
1839                 mdata->s_mirror_fe = NULL;
1840
1841                 iput(mdata->s_bitmap_fe);
1842                 mdata->s_bitmap_fe = NULL;
1843         }
1844 }
1845
1846 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1847 {
1848         int i;
1849         struct inode *inode = NULL;
1850         struct udf_options uopt;
1851         kernel_lb_addr rootdir, fileset;
1852         struct udf_sb_info *sbi;
1853
1854         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1855         uopt.uid = -1;
1856         uopt.gid = -1;
1857         uopt.umask = 0;
1858
1859         sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1860         if (!sbi)
1861                 return -ENOMEM;
1862
1863         sb->s_fs_info = sbi;
1864
1865         mutex_init(&sbi->s_alloc_mutex);
1866
1867         if (!udf_parse_options((char *)options, &uopt, false))
1868                 goto error_out;
1869
1870         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1871             uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
1872                 udf_error(sb, "udf_read_super",
1873                           "utf8 cannot be combined with iocharset\n");
1874                 goto error_out;
1875         }
1876 #ifdef CONFIG_UDF_NLS
1877         if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1878                 uopt.nls_map = load_nls_default();
1879                 if (!uopt.nls_map)
1880                         uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1881                 else
1882                         udf_debug("Using default NLS map\n");
1883         }
1884 #endif
1885         if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1886                 uopt.flags |= (1 << UDF_FLAG_UTF8);
1887
1888         fileset.logicalBlockNum = 0xFFFFFFFF;
1889         fileset.partitionReferenceNum = 0xFFFF;
1890
1891         sbi->s_flags = uopt.flags;
1892         sbi->s_uid = uopt.uid;
1893         sbi->s_gid = uopt.gid;
1894         sbi->s_umask = uopt.umask;
1895         sbi->s_nls_map = uopt.nls_map;
1896
1897         /* Set the block size for all transfers */
1898         if (!sb_min_blocksize(sb, uopt.blocksize)) {
1899                 udf_debug("Bad block size (%d)\n", uopt.blocksize);
1900                 printk(KERN_ERR "udf: bad block size (%d)\n", uopt.blocksize);
1901                 goto error_out;
1902         }
1903
1904         if (uopt.session == 0xFFFFFFFF)
1905                 sbi->s_session = udf_get_last_session(sb);
1906         else
1907                 sbi->s_session = uopt.session;
1908
1909         udf_debug("Multi-session=%d\n", sbi->s_session);
1910
1911         sbi->s_last_block = uopt.lastblock;
1912         sbi->s_anchor[0] = sbi->s_anchor[1] = 0;
1913         sbi->s_anchor[2] = uopt.anchor;
1914
1915         if (udf_check_valid(sb, uopt.novrs, silent)) {
1916                 /* read volume recognition sequences */
1917                 printk(KERN_WARNING "UDF-fs: No VRS found\n");
1918                 goto error_out;
1919         }
1920
1921         udf_find_anchor(sb);
1922
1923         /* Fill in the rest of the superblock */
1924         sb->s_op = &udf_sb_ops;
1925         sb->s_export_op = &udf_export_ops;
1926         sb->dq_op = NULL;
1927         sb->s_dirt = 0;
1928         sb->s_magic = UDF_SUPER_MAGIC;
1929         sb->s_time_gran = 1000;
1930
1931         if (udf_load_sequence(sb, &fileset)) {
1932                 printk(KERN_WARNING "UDF-fs: No partition found (1)\n");
1933                 goto error_out;
1934         }
1935
1936         udf_debug("Lastblock=%d\n", sbi->s_last_block);
1937
1938         if (sbi->s_lvid_bh) {
1939                 struct logicalVolIntegrityDescImpUse *lvidiu =
1940                                                         udf_sb_lvidiu(sbi);
1941                 uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
1942                 uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
1943                 /* uint16_t maxUDFWriteRev =
1944                                 le16_to_cpu(lvidiu->maxUDFWriteRev); */
1945
1946                 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
1947                         printk(KERN_ERR "UDF-fs: minUDFReadRev=%x "
1948                                         "(max is %x)\n",
1949                                le16_to_cpu(lvidiu->minUDFReadRev),
1950                                UDF_MAX_READ_VERSION);
1951                         goto error_out;
1952                 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
1953                         sb->s_flags |= MS_RDONLY;
1954
1955                 sbi->s_udfrev = minUDFWriteRev;
1956
1957                 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1958                         UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
1959                 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
1960                         UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
1961         }
1962
1963         if (!sbi->s_partitions) {
1964                 printk(KERN_WARNING "UDF-fs: No partition found (2)\n");
1965                 goto error_out;
1966         }
1967
1968         if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
1969                         UDF_PART_FLAG_READ_ONLY) {
1970                 printk(KERN_NOTICE "UDF-fs: Partition marked readonly; "
1971                                    "forcing readonly mount\n");
1972                 sb->s_flags |= MS_RDONLY;
1973         }
1974
1975         if (udf_find_fileset(sb, &fileset, &rootdir)) {
1976                 printk(KERN_WARNING "UDF-fs: No fileset found\n");
1977                 goto error_out;
1978         }
1979
1980         if (!silent) {
1981                 timestamp ts;
1982                 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
1983                 udf_info("UDF: Mounting volume '%s', "
1984                          "timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
1985                          sbi->s_volume_ident, le16_to_cpu(ts.year), ts.month, ts.day,
1986                          ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
1987         }
1988         if (!(sb->s_flags & MS_RDONLY))
1989                 udf_open_lvid(sb);
1990
1991         /* Assign the root inode */
1992         /* assign inodes by physical block number */
1993         /* perhaps it's not extensible enough, but for now ... */
1994         inode = udf_iget(sb, rootdir);
1995         if (!inode) {
1996                 printk(KERN_ERR "UDF-fs: Error in udf_iget, block=%d, "
1997                                 "partition=%d\n",
1998                        rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
1999                 goto error_out;
2000         }
2001
2002         /* Allocate a dentry for the root inode */
2003         sb->s_root = d_alloc_root(inode);
2004         if (!sb->s_root) {
2005                 printk(KERN_ERR "UDF-fs: Couldn't allocate root dentry\n");
2006                 iput(inode);
2007                 goto error_out;
2008         }
2009         sb->s_maxbytes = MAX_LFS_FILESIZE;
2010         return 0;
2011
2012 error_out:
2013         if (sbi->s_vat_inode)
2014                 iput(sbi->s_vat_inode);
2015         if (sbi->s_partitions)
2016                 for (i = 0; i < sbi->s_partitions; i++)
2017                         udf_free_partition(&sbi->s_partmaps[i]);
2018 #ifdef CONFIG_UDF_NLS
2019         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2020                 unload_nls(sbi->s_nls_map);
2021 #endif
2022         if (!(sb->s_flags & MS_RDONLY))
2023                 udf_close_lvid(sb);
2024         brelse(sbi->s_lvid_bh);
2025
2026         kfree(sbi->s_partmaps);
2027         kfree(sbi);
2028         sb->s_fs_info = NULL;
2029
2030         return -EINVAL;
2031 }
2032
2033 static void udf_error(struct super_block *sb, const char *function,
2034                       const char *fmt, ...)
2035 {
2036         va_list args;
2037
2038         if (!(sb->s_flags & MS_RDONLY)) {
2039                 /* mark sb error */
2040                 sb->s_dirt = 1;
2041         }
2042         va_start(args, fmt);
2043         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2044         va_end(args);
2045         printk(KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
2046                 sb->s_id, function, error_buf);
2047 }
2048
2049 void udf_warning(struct super_block *sb, const char *function,
2050                  const char *fmt, ...)
2051 {
2052         va_list args;
2053
2054         va_start(args, fmt);
2055         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2056         va_end(args);
2057         printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
2058                sb->s_id, function, error_buf);
2059 }
2060
2061 static void udf_put_super(struct super_block *sb)
2062 {
2063         int i;
2064         struct udf_sb_info *sbi;
2065
2066         sbi = UDF_SB(sb);
2067         if (sbi->s_vat_inode)
2068                 iput(sbi->s_vat_inode);
2069         if (sbi->s_partitions)
2070                 for (i = 0; i < sbi->s_partitions; i++)
2071                         udf_free_partition(&sbi->s_partmaps[i]);
2072 #ifdef CONFIG_UDF_NLS
2073         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2074                 unload_nls(sbi->s_nls_map);
2075 #endif
2076         if (!(sb->s_flags & MS_RDONLY))
2077                 udf_close_lvid(sb);
2078         brelse(sbi->s_lvid_bh);
2079         kfree(sbi->s_partmaps);
2080         kfree(sb->s_fs_info);
2081         sb->s_fs_info = NULL;
2082 }
2083
2084 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
2085 {
2086         struct super_block *sb = dentry->d_sb;
2087         struct udf_sb_info *sbi = UDF_SB(sb);
2088         struct logicalVolIntegrityDescImpUse *lvidiu;
2089
2090         if (sbi->s_lvid_bh != NULL)
2091                 lvidiu = udf_sb_lvidiu(sbi);
2092         else
2093                 lvidiu = NULL;
2094
2095         buf->f_type = UDF_SUPER_MAGIC;
2096         buf->f_bsize = sb->s_blocksize;
2097         buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
2098         buf->f_bfree = udf_count_free(sb);
2099         buf->f_bavail = buf->f_bfree;
2100         buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2101                                           le32_to_cpu(lvidiu->numDirs)) : 0)
2102                         + buf->f_bfree;
2103         buf->f_ffree = buf->f_bfree;
2104         /* __kernel_fsid_t f_fsid */
2105         buf->f_namelen = UDF_NAME_LEN - 2;
2106
2107         return 0;
2108 }
2109
2110 static unsigned int udf_count_free_bitmap(struct super_block *sb,
2111                                           struct udf_bitmap *bitmap)
2112 {
2113         struct buffer_head *bh = NULL;
2114         unsigned int accum = 0;
2115         int index;
2116         int block = 0, newblock;
2117         kernel_lb_addr loc;
2118         uint32_t bytes;
2119         uint8_t *ptr;
2120         uint16_t ident;
2121         struct spaceBitmapDesc *bm;
2122
2123         lock_kernel();
2124
2125         loc.logicalBlockNum = bitmap->s_extPosition;
2126         loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
2127         bh = udf_read_ptagged(sb, loc, 0, &ident);
2128
2129         if (!bh) {
2130                 printk(KERN_ERR "udf: udf_count_free failed\n");
2131                 goto out;
2132         } else if (ident != TAG_IDENT_SBD) {
2133                 brelse(bh);
2134                 printk(KERN_ERR "udf: udf_count_free failed\n");
2135                 goto out;
2136         }
2137
2138         bm = (struct spaceBitmapDesc *)bh->b_data;
2139         bytes = le32_to_cpu(bm->numOfBytes);
2140         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2141         ptr = (uint8_t *)bh->b_data;
2142
2143         while (bytes > 0) {
2144                 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2145                 accum += bitmap_weight((const unsigned long *)(ptr + index),
2146                                         cur_bytes * 8);
2147                 bytes -= cur_bytes;
2148                 if (bytes) {
2149                         brelse(bh);
2150                         newblock = udf_get_lb_pblock(sb, loc, ++block);
2151                         bh = udf_tread(sb, newblock);
2152                         if (!bh) {
2153                                 udf_debug("read failed\n");
2154                                 goto out;
2155                         }
2156                         index = 0;
2157                         ptr = (uint8_t *)bh->b_data;
2158                 }
2159         }
2160         brelse(bh);
2161
2162 out:
2163         unlock_kernel();
2164
2165         return accum;
2166 }
2167
2168 static unsigned int udf_count_free_table(struct super_block *sb,
2169                                          struct inode *table)
2170 {
2171         unsigned int accum = 0;
2172         uint32_t elen;
2173         kernel_lb_addr eloc;
2174         int8_t etype;
2175         struct extent_position epos;
2176
2177         lock_kernel();
2178
2179         epos.block = UDF_I(table)->i_location;
2180         epos.offset = sizeof(struct unallocSpaceEntry);
2181         epos.bh = NULL;
2182
2183         while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2184                 accum += (elen >> table->i_sb->s_blocksize_bits);
2185
2186         brelse(epos.bh);
2187
2188         unlock_kernel();
2189
2190         return accum;
2191 }
2192
2193 static unsigned int udf_count_free(struct super_block *sb)
2194 {
2195         unsigned int accum = 0;
2196         struct udf_sb_info *sbi;
2197         struct udf_part_map *map;
2198
2199         sbi = UDF_SB(sb);
2200         if (sbi->s_lvid_bh) {
2201                 struct logicalVolIntegrityDesc *lvid =
2202                         (struct logicalVolIntegrityDesc *)
2203                         sbi->s_lvid_bh->b_data;
2204                 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
2205                         accum = le32_to_cpu(
2206                                         lvid->freeSpaceTable[sbi->s_partition]);
2207                         if (accum == 0xFFFFFFFF)
2208                                 accum = 0;
2209                 }
2210         }
2211
2212         if (accum)
2213                 return accum;
2214
2215         map = &sbi->s_partmaps[sbi->s_partition];
2216         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2217                 accum += udf_count_free_bitmap(sb,
2218                                                map->s_uspace.s_bitmap);
2219         }
2220         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
2221                 accum += udf_count_free_bitmap(sb,
2222                                                map->s_fspace.s_bitmap);
2223         }
2224         if (accum)
2225                 return accum;
2226
2227         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2228                 accum += udf_count_free_table(sb,
2229                                               map->s_uspace.s_table);
2230         }
2231         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
2232                 accum += udf_count_free_table(sb,
2233                                               map->s_fspace.s_table);
2234         }
2235
2236         return accum;
2237 }