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/buffer_head.h>
  52 #include <linux/vfs.h>
  53 #include <linux/vmalloc.h>
  54 #include <linux/errno.h>
  55 #include <linux/mount.h>
  56 #include <linux/seq_file.h>
  57 #include <linux/bitmap.h>
  58 #include <linux/crc-itu-t.h>
  59 #include <linux/log2.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 enum { UDF_MAX_LINKS = 0xffff };
  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 int udf_sync_fs(struct super_block *, int);
  85 static int udf_remount_fs(struct super_block *, int *, char *);
  86 static void udf_load_logicalvolint(struct super_block *, struct kernel_extent_ad);
  87 static int udf_find_fileset(struct super_block *, struct kernel_lb_addr *,
  88                             struct kernel_lb_addr *);
  89 static void udf_load_fileset(struct super_block *, struct buffer_head *,
  90                              struct kernel_lb_addr *);
  91 static void udf_open_lvid(struct super_block *);
  92 static void udf_close_lvid(struct super_block *);
  93 static unsigned int udf_count_free(struct super_block *);
  94 static int udf_statfs(struct dentry *, struct kstatfs *);
  95 static int udf_show_options(struct seq_file *, struct dentry *);
  96
  97 struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct udf_sb_info *sbi)
  98 {
  99         struct logicalVolIntegrityDesc *lvid =
 100                 (struct logicalVolIntegrityDesc *)sbi->s_lvid_bh->b_data;
 101         __u32 number_of_partitions = le32_to_cpu(lvid->numOfPartitions);
 102         __u32 offset = number_of_partitions * 2 *
 103                                 sizeof(uint32_t)/sizeof(uint8_t);
 104         return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
 105 }
 106
 107 /* UDF filesystem type */
 108 static struct dentry *udf_mount(struct file_system_type *fs_type,
 109                       int flags, const char *dev_name, void *data)
 110 {
 111         return mount_bdev(fs_type, flags, dev_name, data, udf_fill_super);
 112 }
 113
 114 static struct file_system_type udf_fstype = {
 115         .owner          = THIS_MODULE,
 116         .name           = "udf",
 117         .mount          = udf_mount,
 118         .kill_sb        = kill_block_super,
 119         .fs_flags       = FS_REQUIRES_DEV,
 120 };
 121 MODULE_ALIAS_FS("udf");
 122
 123 static struct kmem_cache *udf_inode_cachep;
 124
 125 static struct inode *udf_alloc_inode(struct super_block *sb)
 126 {
 127         struct udf_inode_info *ei;
 128         ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
 129         if (!ei)
 130                 return NULL;
 131
 132         ei->i_unique = 0;
 133         ei->i_lenExtents = 0;
 134         ei->i_next_alloc_block = 0;
 135         ei->i_next_alloc_goal = 0;
 136         ei->i_strat4096 = 0;
 137         init_rwsem(&ei->i_data_sem);
 138         ei->cached_extent.lstart = -1;
 139         spin_lock_init(&ei->i_extent_cache_lock);
 140
 141         return &ei->vfs_inode;
 142 }
 143
 144 static void udf_i_callback(struct rcu_head *head)
 145 {
 146         struct inode *inode = container_of(head, struct inode, i_rcu);
 147         kmem_cache_free(udf_inode_cachep, UDF_I(inode));
 148 }
 149
 150 static void udf_destroy_inode(struct inode *inode)
 151 {
 152         call_rcu(&inode->i_rcu, udf_i_callback);
 153 }
 154
 155 static void init_once(void *foo)
 156 {
 157         struct udf_inode_info *ei = (struct udf_inode_info *)foo;
 158
 159         ei->i_ext.i_data = NULL;
 160         inode_init_once(&ei->vfs_inode);
 161 }
 162
 163 static int init_inodecache(void)
 164 {
 165         udf_inode_cachep = kmem_cache_create("udf_inode_cache",
 166                                              sizeof(struct udf_inode_info),
 167                                              0, (SLAB_RECLAIM_ACCOUNT |
 168                                                  SLAB_MEM_SPREAD),
 169                                              init_once);
 170         if (!udf_inode_cachep)
 171                 return -ENOMEM;
 172         return 0;
 173 }
 174
 175 static void destroy_inodecache(void)
 176 {
 177         /*
 178          * Make sure all delayed rcu free inodes are flushed before we
 179          * destroy cache.
 180          */
 181         rcu_barrier();
 182         kmem_cache_destroy(udf_inode_cachep);
 183 }
 184
 185 /* Superblock operations */
 186 static const struct super_operations udf_sb_ops = {
 187         .alloc_inode    = udf_alloc_inode,
 188         .destroy_inode  = udf_destroy_inode,
 189         .write_inode    = udf_write_inode,
 190         .evict_inode    = udf_evict_inode,
 191         .put_super      = udf_put_super,
 192         .sync_fs        = udf_sync_fs,
 193         .statfs         = udf_statfs,
 194         .remount_fs     = udf_remount_fs,
 195         .show_options   = udf_show_options,
 196 };
 197
 198 struct udf_options {
 199         unsigned char novrs;
 200         unsigned int blocksize;
 201         unsigned int session;
 202         unsigned int lastblock;
 203         unsigned int anchor;
 204         unsigned int volume;
 205         unsigned short partition;
 206         unsigned int fileset;
 207         unsigned int rootdir;
 208         unsigned int flags;
 209         umode_t umask;
 210         kgid_t gid;
 211         kuid_t uid;
 212         umode_t fmode;
 213         umode_t dmode;
 214         struct nls_table *nls_map;
 215 };
 216
 217 static int __init init_udf_fs(void)
 218 {
 219         int err;
 220
 221         err = init_inodecache();
 222         if (err)
 223                 goto out1;
 224         err = register_filesystem(&udf_fstype);
 225         if (err)
 226                 goto out;
 227
 228         return 0;
 229
 230 out:
 231         destroy_inodecache();
 232
 233 out1:
 234         return err;
 235 }
 236
 237 static void __exit exit_udf_fs(void)
 238 {
 239         unregister_filesystem(&udf_fstype);
 240         destroy_inodecache();
 241 }
 242
 243 module_init(init_udf_fs)
 244 module_exit(exit_udf_fs)
 245
 246 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
 247 {
 248         struct udf_sb_info *sbi = UDF_SB(sb);
 249
 250         sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map),
 251                                   GFP_KERNEL);
 252         if (!sbi->s_partmaps) {
 253                 udf_err(sb, "Unable to allocate space for %d partition maps\n",
 254                         count);
 255                 sbi->s_partitions = 0;
 256                 return -ENOMEM;
 257         }
 258
 259         sbi->s_partitions = count;
 260         return 0;
 261 }
 262
 263 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
 264 {
 265         int i;
 266         int nr_groups = bitmap->s_nr_groups;
 267         int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
 268                                                 nr_groups);
 269
 270         for (i = 0; i < nr_groups; i++)
 271                 if (bitmap->s_block_bitmap[i])
 272                         brelse(bitmap->s_block_bitmap[i]);
 273
 274         if (size <= PAGE_SIZE)
 275                 kfree(bitmap);
 276         else
 277                 vfree(bitmap);
 278 }
 279
 280 static void udf_free_partition(struct udf_part_map *map)
 281 {
 282         int i;
 283         struct udf_meta_data *mdata;
 284
 285         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
 286                 iput(map->s_uspace.s_table);
 287         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
 288                 iput(map->s_fspace.s_table);
 289         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
 290                 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
 291         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
 292                 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
 293         if (map->s_partition_type == UDF_SPARABLE_MAP15)
 294                 for (i = 0; i < 4; i++)
 295                         brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
 296         else if (map->s_partition_type == UDF_METADATA_MAP25) {
 297                 mdata = &map->s_type_specific.s_metadata;
 298                 iput(mdata->s_metadata_fe);
 299                 mdata->s_metadata_fe = NULL;
 300
 301                 iput(mdata->s_mirror_fe);
 302                 mdata->s_mirror_fe = NULL;
 303
 304                 iput(mdata->s_bitmap_fe);
 305                 mdata->s_bitmap_fe = NULL;
 306         }
 307 }
 308
 309 static void udf_sb_free_partitions(struct super_block *sb)
 310 {
 311         struct udf_sb_info *sbi = UDF_SB(sb);
 312         int i;
 313         if (sbi->s_partmaps == NULL)
 314                 return;
 315         for (i = 0; i < sbi->s_partitions; i++)
 316                 udf_free_partition(&sbi->s_partmaps[i]);
 317         kfree(sbi->s_partmaps);
 318         sbi->s_partmaps = NULL;
 319 }
 320
 321 static int udf_show_options(struct seq_file *seq, struct dentry *root)
 322 {
 323         struct super_block *sb = root->d_sb;
 324         struct udf_sb_info *sbi = UDF_SB(sb);
 325
 326         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
 327                 seq_puts(seq, ",nostrict");
 328         if (UDF_QUERY_FLAG(sb, UDF_FLAG_BLOCKSIZE_SET))
 329                 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
 330         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
 331                 seq_puts(seq, ",unhide");
 332         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
 333                 seq_puts(seq, ",undelete");
 334         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
 335                 seq_puts(seq, ",noadinicb");
 336         if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
 337                 seq_puts(seq, ",shortad");
 338         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
 339                 seq_puts(seq, ",uid=forget");
 340         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_IGNORE))
 341                 seq_puts(seq, ",uid=ignore");
 342         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
 343                 seq_puts(seq, ",gid=forget");
 344         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE))
 345                 seq_puts(seq, ",gid=ignore");
 346         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
 347                 seq_printf(seq, ",uid=%u", from_kuid(&init_user_ns, sbi->s_uid));
 348         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
 349                 seq_printf(seq, ",gid=%u", from_kgid(&init_user_ns, sbi->s_gid));
 350         if (sbi->s_umask != 0)
 351                 seq_printf(seq, ",umask=%ho", sbi->s_umask);
 352         if (sbi->s_fmode != UDF_INVALID_MODE)
 353                 seq_printf(seq, ",mode=%ho", sbi->s_fmode);
 354         if (sbi->s_dmode != UDF_INVALID_MODE)
 355                 seq_printf(seq, ",dmode=%ho", sbi->s_dmode);
 356         if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
 357                 seq_printf(seq, ",session=%u", sbi->s_session);
 358         if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
 359                 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
 360         if (sbi->s_anchor != 0)
 361                 seq_printf(seq, ",anchor=%u", sbi->s_anchor);
 362         /*
 363          * volume, partition, fileset and rootdir seem to be ignored
 364          * currently
 365          */
 366         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
 367                 seq_puts(seq, ",utf8");
 368         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
 369                 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
 370
 371         return 0;
 372 }
 373
 374 /*
 375  * udf_parse_options
 376  *
 377  * PURPOSE
 378  *      Parse mount options.
 379  *
 380  * DESCRIPTION
 381  *      The following mount options are supported:
 382  *
 383  *      gid=            Set the default group.
 384  *      umask=          Set the default umask.
 385  *      mode=           Set the default file permissions.
 386  *      dmode=          Set the default directory permissions.
 387  *      uid=            Set the default user.
 388  *      bs=             Set the block size.
 389  *      unhide          Show otherwise hidden files.
 390  *      undelete        Show deleted files in lists.
 391  *      adinicb         Embed data in the inode (default)
 392  *      noadinicb       Don't embed data in the inode
 393  *      shortad         Use short ad's
 394  *      longad          Use long ad's (default)
 395  *      nostrict        Unset strict conformance
 396  *      iocharset=      Set the NLS character set
 397  *
 398  *      The remaining are for debugging and disaster recovery:
 399  *
 400  *      novrs           Skip volume sequence recognition
 401  *
 402  *      The following expect a offset from 0.
 403  *
 404  *      session=        Set the CDROM session (default= last session)
 405  *      anchor=         Override standard anchor location. (default= 256)
 406  *      volume=         Override the VolumeDesc location. (unused)
 407  *      partition=      Override the PartitionDesc location. (unused)
 408  *      lastblock=      Set the last block of the filesystem/
 409  *
 410  *      The following expect a offset from the partition root.
 411  *
 412  *      fileset=        Override the fileset block location. (unused)
 413  *      rootdir=        Override the root directory location. (unused)
 414  *              WARNING: overriding the rootdir to a non-directory may
 415  *              yield highly unpredictable results.
 416  *
 417  * PRE-CONDITIONS
 418  *      options         Pointer to mount options string.
 419  *      uopts           Pointer to mount options variable.
 420  *
 421  * POST-CONDITIONS
 422  *      <return>        1       Mount options parsed okay.
 423  *      <return>        0       Error parsing mount options.
 424  *
 425  * HISTORY
 426  *      July 1, 1997 - Andrew E. Mileski
 427  *      Written, tested, and released.
 428  */
 429
 430 enum {
 431         Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
 432         Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
 433         Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
 434         Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
 435         Opt_rootdir, Opt_utf8, Opt_iocharset,
 436         Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore,
 437         Opt_fmode, Opt_dmode
 438 };
 439
 440 static const match_table_t tokens = {
 441         {Opt_novrs,     "novrs"},
 442         {Opt_nostrict,  "nostrict"},
 443         {Opt_bs,        "bs=%u"},
 444         {Opt_unhide,    "unhide"},
 445         {Opt_undelete,  "undelete"},
 446         {Opt_noadinicb, "noadinicb"},
 447         {Opt_adinicb,   "adinicb"},
 448         {Opt_shortad,   "shortad"},
 449         {Opt_longad,    "longad"},
 450         {Opt_uforget,   "uid=forget"},
 451         {Opt_uignore,   "uid=ignore"},
 452         {Opt_gforget,   "gid=forget"},
 453         {Opt_gignore,   "gid=ignore"},
 454         {Opt_gid,       "gid=%u"},
 455         {Opt_uid,       "uid=%u"},
 456         {Opt_umask,     "umask=%o"},
 457         {Opt_session,   "session=%u"},
 458         {Opt_lastblock, "lastblock=%u"},
 459         {Opt_anchor,    "anchor=%u"},
 460         {Opt_volume,    "volume=%u"},
 461         {Opt_partition, "partition=%u"},
 462         {Opt_fileset,   "fileset=%u"},
 463         {Opt_rootdir,   "rootdir=%u"},
 464         {Opt_utf8,      "utf8"},
 465         {Opt_iocharset, "iocharset=%s"},
 466         {Opt_fmode,     "mode=%o"},
 467         {Opt_dmode,     "dmode=%o"},
 468         {Opt_err,       NULL}
 469 };
 470
 471 static int udf_parse_options(char *options, struct udf_options *uopt,
 472                              bool remount)
 473 {
 474         char *p;
 475         int option;
 476
 477         uopt->novrs = 0;
 478         uopt->partition = 0xFFFF;
 479         uopt->session = 0xFFFFFFFF;
 480         uopt->lastblock = 0;
 481         uopt->anchor = 0;
 482         uopt->volume = 0xFFFFFFFF;
 483         uopt->rootdir = 0xFFFFFFFF;
 484         uopt->fileset = 0xFFFFFFFF;
 485         uopt->nls_map = NULL;
 486
 487         if (!options)
 488                 return 1;
 489
 490         while ((p = strsep(&options, ",")) != NULL) {
 491                 substring_t args[MAX_OPT_ARGS];
 492                 int token;
 493                 if (!*p)
 494                         continue;
 495
 496                 token = match_token(p, tokens, args);
 497                 switch (token) {
 498                 case Opt_novrs:
 499                         uopt->novrs = 1;
 500                         break;
 501                 case Opt_bs:
 502                         if (match_int(&args[0], &option))
 503                                 return 0;
 504                         uopt->blocksize = option;
 505                         uopt->flags |= (1 << UDF_FLAG_BLOCKSIZE_SET);
 506                         break;
 507                 case Opt_unhide:
 508                         uopt->flags |= (1 << UDF_FLAG_UNHIDE);
 509                         break;
 510                 case Opt_undelete:
 511                         uopt->flags |= (1 << UDF_FLAG_UNDELETE);
 512                         break;
 513                 case Opt_noadinicb:
 514                         uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
 515                         break;
 516                 case Opt_adinicb:
 517                         uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
 518                         break;
 519                 case Opt_shortad:
 520                         uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
 521                         break;
 522                 case Opt_longad:
 523                         uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
 524                         break;
 525                 case Opt_gid:
 526                         if (match_int(args, &option))
 527                                 return 0;
 528                         uopt->gid = make_kgid(current_user_ns(), option);
 529                         if (!gid_valid(uopt->gid))
 530                                 return 0;
 531                         uopt->flags |= (1 << UDF_FLAG_GID_SET);
 532                         break;
 533                 case Opt_uid:
 534                         if (match_int(args, &option))
 535                                 return 0;
 536                         uopt->uid = make_kuid(current_user_ns(), option);
 537                         if (!uid_valid(uopt->uid))
 538                                 return 0;
 539                         uopt->flags |= (1 << UDF_FLAG_UID_SET);
 540                         break;
 541                 case Opt_umask:
 542                         if (match_octal(args, &option))
 543                                 return 0;
 544                         uopt->umask = option;
 545                         break;
 546                 case Opt_nostrict:
 547                         uopt->flags &= ~(1 << UDF_FLAG_STRICT);
 548                         break;
 549                 case Opt_session:
 550                         if (match_int(args, &option))
 551                                 return 0;
 552                         uopt->session = option;
 553                         if (!remount)
 554                                 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
 555                         break;
 556                 case Opt_lastblock:
 557                         if (match_int(args, &option))
 558                                 return 0;
 559                         uopt->lastblock = option;
 560                         if (!remount)
 561                                 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
 562                         break;
 563                 case Opt_anchor:
 564                         if (match_int(args, &option))
 565                                 return 0;
 566                         uopt->anchor = option;
 567                         break;
 568                 case Opt_volume:
 569                         if (match_int(args, &option))
 570                                 return 0;
 571                         uopt->volume = option;
 572                         break;
 573                 case Opt_partition:
 574                         if (match_int(args, &option))
 575                                 return 0;
 576                         uopt->partition = option;
 577                         break;
 578                 case Opt_fileset:
 579                         if (match_int(args, &option))
 580                                 return 0;
 581                         uopt->fileset = option;
 582                         break;
 583                 case Opt_rootdir:
 584                         if (match_int(args, &option))
 585                                 return 0;
 586                         uopt->rootdir = option;
 587                         break;
 588                 case Opt_utf8:
 589                         uopt->flags |= (1 << UDF_FLAG_UTF8);
 590                         break;
 591 #ifdef CONFIG_UDF_NLS
 592                 case Opt_iocharset:
 593                         uopt->nls_map = load_nls(args[0].from);
 594                         uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
 595                         break;
 596 #endif
 597                 case Opt_uignore:
 598                         uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
 599                         break;
 600                 case Opt_uforget:
 601                         uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
 602                         break;
 603                 case Opt_gignore:
 604                         uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
 605                         break;
 606                 case Opt_gforget:
 607                         uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
 608                         break;
 609                 case Opt_fmode:
 610                         if (match_octal(args, &option))
 611                                 return 0;
 612                         uopt->fmode = option & 0777;
 613                         break;
 614                 case Opt_dmode:
 615                         if (match_octal(args, &option))
 616                                 return 0;
 617                         uopt->dmode = option & 0777;
 618                         break;
 619                 default:
 620                         pr_err("bad mount option \"%s\" or missing value\n", p);
 621                         return 0;
 622                 }
 623         }
 624         return 1;
 625 }
 626
 627 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
 628 {
 629         struct udf_options uopt;
 630         struct udf_sb_info *sbi = UDF_SB(sb);
 631         int error = 0;
 632
 633         uopt.flags = sbi->s_flags;
 634         uopt.uid   = sbi->s_uid;
 635         uopt.gid   = sbi->s_gid;
 636         uopt.umask = sbi->s_umask;
 637         uopt.fmode = sbi->s_fmode;
 638         uopt.dmode = sbi->s_dmode;
 639
 640         if (!udf_parse_options(options, &uopt, true))
 641                 return -EINVAL;
 642
 643         write_lock(&sbi->s_cred_lock);
 644         sbi->s_flags = uopt.flags;
 645         sbi->s_uid   = uopt.uid;
 646         sbi->s_gid   = uopt.gid;
 647         sbi->s_umask = uopt.umask;
 648         sbi->s_fmode = uopt.fmode;
 649         sbi->s_dmode = uopt.dmode;
 650         write_unlock(&sbi->s_cred_lock);
 651
 652         if (sbi->s_lvid_bh) {
 653                 int write_rev = le16_to_cpu(udf_sb_lvidiu(sbi)->minUDFWriteRev);
 654                 if (write_rev > UDF_MAX_WRITE_VERSION)
 655                         *flags |= MS_RDONLY;
 656         }
 657
 658         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 659                 goto out_unlock;
 660
 661         if (*flags & MS_RDONLY)
 662                 udf_close_lvid(sb);
 663         else
 664                 udf_open_lvid(sb);
 665
 666 out_unlock:
 667         return error;
 668 }
 669
 670 /* Check Volume Structure Descriptors (ECMA 167 2/9.1) */
 671 /* We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
 672 static loff_t udf_check_vsd(struct super_block *sb)
 673 {
 674         struct volStructDesc *vsd = NULL;
 675         loff_t sector = 32768;
 676         int sectorsize;
 677         struct buffer_head *bh = NULL;
 678         int nsr02 = 0;
 679         int nsr03 = 0;
 680         struct udf_sb_info *sbi;
 681
 682         sbi = UDF_SB(sb);
 683         if (sb->s_blocksize < sizeof(struct volStructDesc))
 684                 sectorsize = sizeof(struct volStructDesc);
 685         else
 686                 sectorsize = sb->s_blocksize;
 687
 688         sector += (sbi->s_session << sb->s_blocksize_bits);
 689
 690         udf_debug("Starting at sector %u (%ld byte sectors)\n",
 691                   (unsigned int)(sector >> sb->s_blocksize_bits),
 692                   sb->s_blocksize);
 693         /* Process the sequence (if applicable) */
 694         for (; !nsr02 && !nsr03; sector += sectorsize) {
 695                 /* Read a block */
 696                 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
 697                 if (!bh)
 698                         break;
 699
 700                 /* Look for ISO  descriptors */
 701                 vsd = (struct volStructDesc *)(bh->b_data +
 702                                               (sector & (sb->s_blocksize - 1)));
 703
 704                 if (vsd->stdIdent[0] == 0) {
 705                         brelse(bh);
 706                         break;
 707                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
 708                                     VSD_STD_ID_LEN)) {
 709                         switch (vsd->structType) {
 710                         case 0:
 711                                 udf_debug("ISO9660 Boot Record found\n");
 712                                 break;
 713                         case 1:
 714                                 udf_debug("ISO9660 Primary Volume Descriptor found\n");
 715                                 break;
 716                         case 2:
 717                                 udf_debug("ISO9660 Supplementary Volume Descriptor found\n");
 718                                 break;
 719                         case 3:
 720                                 udf_debug("ISO9660 Volume Partition Descriptor found\n");
 721                                 break;
 722                         case 255:
 723                                 udf_debug("ISO9660 Volume Descriptor Set Terminator found\n");
 724                                 break;
 725                         default:
 726                                 udf_debug("ISO9660 VRS (%u) found\n",
 727                                           vsd->structType);
 728                                 break;
 729                         }
 730                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
 731                                     VSD_STD_ID_LEN))
 732                         ; /* nothing */
 733                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
 734                                     VSD_STD_ID_LEN)) {
 735                         brelse(bh);
 736                         break;
 737                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
 738                                     VSD_STD_ID_LEN))
 739                         nsr02 = sector;
 740                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
 741                                     VSD_STD_ID_LEN))
 742                         nsr03 = sector;
 743                 brelse(bh);
 744         }
 745
 746         if (nsr03)
 747                 return nsr03;
 748         else if (nsr02)
 749                 return nsr02;
 750         else if (sector - (sbi->s_session << sb->s_blocksize_bits) == 32768)
 751                 return -1;
 752         else
 753                 return 0;
 754 }
 755
 756 static int udf_find_fileset(struct super_block *sb,
 757                             struct kernel_lb_addr *fileset,
 758                             struct kernel_lb_addr *root)
 759 {
 760         struct buffer_head *bh = NULL;
 761         long lastblock;
 762         uint16_t ident;
 763         struct udf_sb_info *sbi;
 764
 765         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
 766             fileset->partitionReferenceNum != 0xFFFF) {
 767                 bh = udf_read_ptagged(sb, fileset, 0, &ident);
 768
 769                 if (!bh) {
 770                         return 1;
 771                 } else if (ident != TAG_IDENT_FSD) {
 772                         brelse(bh);
 773                         return 1;
 774                 }
 775
 776         }
 777
 778         sbi = UDF_SB(sb);
 779         if (!bh) {
 780                 /* Search backwards through the partitions */
 781                 struct kernel_lb_addr newfileset;
 782
 783 /* --> cvg: FIXME - is it reasonable? */
 784                 return 1;
 785
 786                 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
 787                      (newfileset.partitionReferenceNum != 0xFFFF &&
 788                       fileset->logicalBlockNum == 0xFFFFFFFF &&
 789                       fileset->partitionReferenceNum == 0xFFFF);
 790                      newfileset.partitionReferenceNum--) {
 791                         lastblock = sbi->s_partmaps
 792                                         [newfileset.partitionReferenceNum]
 793                                                 .s_partition_len;
 794                         newfileset.logicalBlockNum = 0;
 795
 796                         do {
 797                                 bh = udf_read_ptagged(sb, &newfileset, 0,
 798                                                       &ident);
 799                                 if (!bh) {
 800                                         newfileset.logicalBlockNum++;
 801                                         continue;
 802                                 }
 803
 804                                 switch (ident) {
 805                                 case TAG_IDENT_SBD:
 806                                 {
 807                                         struct spaceBitmapDesc *sp;
 808                                         sp = (struct spaceBitmapDesc *)
 809                                                                 bh->b_data;
 810                                         newfileset.logicalBlockNum += 1 +
 811                                                 ((le32_to_cpu(sp->numOfBytes) +
 812                                                   sizeof(struct spaceBitmapDesc)
 813                                                   - 1) >> sb->s_blocksize_bits);
 814                                         brelse(bh);
 815                                         break;
 816                                 }
 817                                 case TAG_IDENT_FSD:
 818                                         *fileset = newfileset;
 819                                         break;
 820                                 default:
 821                                         newfileset.logicalBlockNum++;
 822                                         brelse(bh);
 823                                         bh = NULL;
 824                                         break;
 825                                 }
 826                         } while (newfileset.logicalBlockNum < lastblock &&
 827                                  fileset->logicalBlockNum == 0xFFFFFFFF &&
 828                                  fileset->partitionReferenceNum == 0xFFFF);
 829                 }
 830         }
 831
 832         if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
 833              fileset->partitionReferenceNum != 0xFFFF) && bh) {
 834                 udf_debug("Fileset at block=%d, partition=%d\n",
 835                           fileset->logicalBlockNum,
 836                           fileset->partitionReferenceNum);
 837
 838                 sbi->s_partition = fileset->partitionReferenceNum;
 839                 udf_load_fileset(sb, bh, root);
 840                 brelse(bh);
 841                 return 0;
 842         }
 843         return 1;
 844 }
 845
 846 static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
 847 {
 848         struct primaryVolDesc *pvoldesc;
 849         struct ustr *instr, *outstr;
 850         struct buffer_head *bh;
 851         uint16_t ident;
 852         int ret = 1;
 853
 854         instr = kmalloc(sizeof(struct ustr), GFP_NOFS);
 855         if (!instr)
 856                 return 1;
 857
 858         outstr = kmalloc(sizeof(struct ustr), GFP_NOFS);
 859         if (!outstr)
 860                 goto out1;
 861
 862         bh = udf_read_tagged(sb, block, block, &ident);
 863         if (!bh)
 864                 goto out2;
 865
 866         BUG_ON(ident != TAG_IDENT_PVD);
 867
 868         pvoldesc = (struct primaryVolDesc *)bh->b_data;
 869
 870         if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
 871                               pvoldesc->recordingDateAndTime)) {
 872 #ifdef UDFFS_DEBUG
 873                 struct timestamp *ts = &pvoldesc->recordingDateAndTime;
 874                 udf_debug("recording time %04u/%02u/%02u %02u:%02u (%x)\n",
 875                           le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
 876                           ts->minute, le16_to_cpu(ts->typeAndTimezone));
 877 #endif
 878         }
 879
 880         if (!udf_build_ustr(instr, pvoldesc->volIdent, 32))
 881                 if (udf_CS0toUTF8(outstr, instr)) {
 882                         strncpy(UDF_SB(sb)->s_volume_ident, outstr->u_name,
 883                                 outstr->u_len > 31 ? 31 : outstr->u_len);
 884                         udf_debug("volIdent[] = '%s'\n",
 885                                   UDF_SB(sb)->s_volume_ident);
 886                 }
 887
 888         if (!udf_build_ustr(instr, pvoldesc->volSetIdent, 128))
 889                 if (udf_CS0toUTF8(outstr, instr))
 890                         udf_debug("volSetIdent[] = '%s'\n", outstr->u_name);
 891
 892         brelse(bh);
 893         ret = 0;
 894 out2:
 895         kfree(outstr);
 896 out1:
 897         kfree(instr);
 898         return ret;
 899 }
 900
 901 struct inode *udf_find_metadata_inode_efe(struct super_block *sb,
 902                                         u32 meta_file_loc, u32 partition_num)
 903 {
 904         struct kernel_lb_addr addr;
 905         struct inode *metadata_fe;
 906
 907         addr.logicalBlockNum = meta_file_loc;
 908         addr.partitionReferenceNum = partition_num;
 909
 910         metadata_fe = udf_iget(sb, &addr);
 911
 912         if (metadata_fe == NULL)
 913                 udf_warn(sb, "metadata inode efe not found\n");
 914         else if (UDF_I(metadata_fe)->i_alloc_type != ICBTAG_FLAG_AD_SHORT) {
 915                 udf_warn(sb, "metadata inode efe does not have short allocation descriptors!\n");
 916                 iput(metadata_fe);
 917                 metadata_fe = NULL;
 918         }
 919
 920         return metadata_fe;
 921 }
 922
 923 static int udf_load_metadata_files(struct super_block *sb, int partition)
 924 {
 925         struct udf_sb_info *sbi = UDF_SB(sb);
 926         struct udf_part_map *map;
 927         struct udf_meta_data *mdata;
 928         struct kernel_lb_addr addr;
 929
 930         map = &sbi->s_partmaps[partition];
 931         mdata = &map->s_type_specific.s_metadata;
 932
 933         /* metadata address */
 934         udf_debug("Metadata file location: block = %d part = %d\n",
 935                   mdata->s_meta_file_loc, map->s_partition_num);
 936
 937         mdata->s_metadata_fe = udf_find_metadata_inode_efe(sb,
 938                 mdata->s_meta_file_loc, map->s_partition_num);
 939
 940         if (mdata->s_metadata_fe == NULL) {
 941                 /* mirror file entry */
 942                 udf_debug("Mirror metadata file location: block = %d part = %d\n",
 943                           mdata->s_mirror_file_loc, map->s_partition_num);
 944
 945                 mdata->s_mirror_fe = udf_find_metadata_inode_efe(sb,
 946                         mdata->s_mirror_file_loc, map->s_partition_num);
 947
 948                 if (mdata->s_mirror_fe == NULL) {
 949                         udf_err(sb, "Both metadata and mirror metadata inode efe can not found\n");
 950                         goto error_exit;
 951                 }
 952         }
 953
 954         /*
 955          * bitmap file entry
 956          * Note:
 957          * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
 958         */
 959         if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
 960                 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
 961                 addr.partitionReferenceNum = map->s_partition_num;
 962
 963                 udf_debug("Bitmap file location: block = %d part = %d\n",
 964                           addr.logicalBlockNum, addr.partitionReferenceNum);
 965
 966                 mdata->s_bitmap_fe = udf_iget(sb, &addr);
 967
 968                 if (mdata->s_bitmap_fe == NULL) {
 969                         if (sb->s_flags & MS_RDONLY)
 970                                 udf_warn(sb, "bitmap inode efe not found but it's ok since the disc is mounted read-only\n");
 971                         else {
 972                                 udf_err(sb, "bitmap inode efe not found and attempted read-write mount\n");
 973                                 goto error_exit;
 974                         }
 975                 }
 976         }
 977
 978         udf_debug("udf_load_metadata_files Ok\n");
 979
 980         return 0;
 981
 982 error_exit:
 983         return 1;
 984 }
 985
 986 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
 987                              struct kernel_lb_addr *root)
 988 {
 989         struct fileSetDesc *fset;
 990
 991         fset = (struct fileSetDesc *)bh->b_data;
 992
 993         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
 994
 995         UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
 996
 997         udf_debug("Rootdir at block=%d, partition=%d\n",
 998                   root->logicalBlockNum, root->partitionReferenceNum);
 999 }
1000
1001 int udf_compute_nr_groups(struct super_block *sb, u32 partition)
1002 {
1003         struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
1004         return DIV_ROUND_UP(map->s_partition_len +
1005                             (sizeof(struct spaceBitmapDesc) << 3),
1006                             sb->s_blocksize * 8);
1007 }
1008
1009 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
1010 {
1011         struct udf_bitmap *bitmap;
1012         int nr_groups;
1013         int size;
1014
1015         nr_groups = udf_compute_nr_groups(sb, index);
1016         size = sizeof(struct udf_bitmap) +
1017                 (sizeof(struct buffer_head *) * nr_groups);
1018
1019         if (size <= PAGE_SIZE)
1020                 bitmap = kzalloc(size, GFP_KERNEL);
1021         else
1022                 bitmap = vzalloc(size); /* TODO: get rid of vzalloc */
1023
1024         if (bitmap == NULL)
1025                 return NULL;
1026
1027         bitmap->s_nr_groups = nr_groups;
1028         return bitmap;
1029 }
1030
1031 static int udf_fill_partdesc_info(struct super_block *sb,
1032                 struct partitionDesc *p, int p_index)
1033 {
1034         struct udf_part_map *map;
1035         struct udf_sb_info *sbi = UDF_SB(sb);
1036         struct partitionHeaderDesc *phd;
1037
1038         map = &sbi->s_partmaps[p_index];
1039
1040         map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
1041         map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
1042
1043         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
1044                 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
1045         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
1046                 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
1047         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
1048                 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
1049         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
1050                 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
1051
1052         udf_debug("Partition (%d type %x) starts at physical %d, block length %d\n",
1053                   p_index, map->s_partition_type,
1054                   map->s_partition_root, map->s_partition_len);
1055
1056         if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1057             strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
1058                 return 0;
1059
1060         phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1061         if (phd->unallocSpaceTable.extLength) {
1062                 struct kernel_lb_addr loc = {
1063                         .logicalBlockNum = le32_to_cpu(
1064                                 phd->unallocSpaceTable.extPosition),
1065                         .partitionReferenceNum = p_index,
1066                 };
1067
1068                 map->s_uspace.s_table = udf_iget(sb, &loc);
1069                 if (!map->s_uspace.s_table) {
1070                         udf_debug("cannot load unallocSpaceTable (part %d)\n",
1071                                   p_index);
1072                         return 1;
1073                 }
1074                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1075                 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
1076                           p_index, map->s_uspace.s_table->i_ino);
1077         }
1078
1079         if (phd->unallocSpaceBitmap.extLength) {
1080                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1081                 if (!bitmap)
1082                         return 1;
1083                 map->s_uspace.s_bitmap = bitmap;
1084                 bitmap->s_extPosition = le32_to_cpu(
1085                                 phd->unallocSpaceBitmap.extPosition);
1086                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1087                 udf_debug("unallocSpaceBitmap (part %d) @ %d\n",
1088                           p_index, bitmap->s_extPosition);
1089         }
1090
1091         if (phd->partitionIntegrityTable.extLength)
1092                 udf_debug("partitionIntegrityTable (part %d)\n", p_index);
1093
1094         if (phd->freedSpaceTable.extLength) {
1095                 struct kernel_lb_addr loc = {
1096                         .logicalBlockNum = le32_to_cpu(
1097                                 phd->freedSpaceTable.extPosition),
1098                         .partitionReferenceNum = p_index,
1099                 };
1100
1101                 map->s_fspace.s_table = udf_iget(sb, &loc);
1102                 if (!map->s_fspace.s_table) {
1103                         udf_debug("cannot load freedSpaceTable (part %d)\n",
1104                                   p_index);
1105                         return 1;
1106                 }
1107
1108                 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
1109                 udf_debug("freedSpaceTable (part %d) @ %ld\n",
1110                           p_index, map->s_fspace.s_table->i_ino);
1111         }
1112
1113         if (phd->freedSpaceBitmap.extLength) {
1114                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1115                 if (!bitmap)
1116                         return 1;
1117                 map->s_fspace.s_bitmap = bitmap;
1118                 bitmap->s_extPosition = le32_to_cpu(
1119                                 phd->freedSpaceBitmap.extPosition);
1120                 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1121                 udf_debug("freedSpaceBitmap (part %d) @ %d\n",
1122                           p_index, bitmap->s_extPosition);
1123         }
1124         return 0;
1125 }
1126
1127 static void udf_find_vat_block(struct super_block *sb, int p_index,
1128                                int type1_index, sector_t start_block)
1129 {
1130         struct udf_sb_info *sbi = UDF_SB(sb);
1131         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1132         sector_t vat_block;
1133         struct kernel_lb_addr ino;
1134
1135         /*
1136          * VAT file entry is in the last recorded block. Some broken disks have
1137          * it a few blocks before so try a bit harder...
1138          */
1139         ino.partitionReferenceNum = type1_index;
1140         for (vat_block = start_block;
1141              vat_block >= map->s_partition_root &&
1142              vat_block >= start_block - 3 &&
1143              !sbi->s_vat_inode; vat_block--) {
1144                 ino.logicalBlockNum = vat_block - map->s_partition_root;
1145                 sbi->s_vat_inode = udf_iget(sb, &ino);
1146         }
1147 }
1148
1149 static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1150 {
1151         struct udf_sb_info *sbi = UDF_SB(sb);
1152         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1153         struct buffer_head *bh = NULL;
1154         struct udf_inode_info *vati;
1155         uint32_t pos;
1156         struct virtualAllocationTable20 *vat20;
1157         sector_t blocks = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
1158
1159         udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block);
1160         if (!sbi->s_vat_inode &&
1161             sbi->s_last_block != blocks - 1) {
1162                 pr_notice("Failed to read VAT inode from the last recorded block (%lu), retrying with the last block of the device (%lu).\n",
1163                           (unsigned long)sbi->s_last_block,
1164                           (unsigned long)blocks - 1);
1165                 udf_find_vat_block(sb, p_index, type1_index, blocks - 1);
1166         }
1167         if (!sbi->s_vat_inode)
1168                 return 1;
1169
1170         if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1171                 map->s_type_specific.s_virtual.s_start_offset = 0;
1172                 map->s_type_specific.s_virtual.s_num_entries =
1173                         (sbi->s_vat_inode->i_size - 36) >> 2;
1174         } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1175                 vati = UDF_I(sbi->s_vat_inode);
1176                 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1177                         pos = udf_block_map(sbi->s_vat_inode, 0);
1178                         bh = sb_bread(sb, pos);
1179                         if (!bh)
1180                                 return 1;
1181                         vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1182                 } else {
1183                         vat20 = (struct virtualAllocationTable20 *)
1184                                                         vati->i_ext.i_data;
1185                 }
1186
1187                 map->s_type_specific.s_virtual.s_start_offset =
1188                         le16_to_cpu(vat20->lengthHeader);
1189                 map->s_type_specific.s_virtual.s_num_entries =
1190                         (sbi->s_vat_inode->i_size -
1191                                 map->s_type_specific.s_virtual.
1192                                         s_start_offset) >> 2;
1193                 brelse(bh);
1194         }
1195         return 0;
1196 }
1197
1198 static int udf_load_partdesc(struct super_block *sb, sector_t block)
1199 {
1200         struct buffer_head *bh;
1201         struct partitionDesc *p;
1202         struct udf_part_map *map;
1203         struct udf_sb_info *sbi = UDF_SB(sb);
1204         int i, type1_idx;
1205         uint16_t partitionNumber;
1206         uint16_t ident;
1207         int ret = 0;
1208
1209         bh = udf_read_tagged(sb, block, block, &ident);
1210         if (!bh)
1211                 return 1;
1212         if (ident != TAG_IDENT_PD)
1213                 goto out_bh;
1214
1215         p = (struct partitionDesc *)bh->b_data;
1216         partitionNumber = le16_to_cpu(p->partitionNumber);
1217
1218         /* First scan for TYPE1, SPARABLE and METADATA partitions */
1219         for (i = 0; i < sbi->s_partitions; i++) {
1220                 map = &sbi->s_partmaps[i];
1221                 udf_debug("Searching map: (%d == %d)\n",
1222                           map->s_partition_num, partitionNumber);
1223                 if (map->s_partition_num == partitionNumber &&
1224                     (map->s_partition_type == UDF_TYPE1_MAP15 ||
1225                      map->s_partition_type == UDF_SPARABLE_MAP15))
1226                         break;
1227         }
1228
1229         if (i >= sbi->s_partitions) {
1230                 udf_debug("Partition (%d) not found in partition map\n",
1231                           partitionNumber);
1232                 goto out_bh;
1233         }
1234
1235         ret = udf_fill_partdesc_info(sb, p, i);
1236
1237         /*
1238          * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1239          * PHYSICAL partitions are already set up
1240          */
1241         type1_idx = i;
1242         for (i = 0; i < sbi->s_partitions; i++) {
1243                 map = &sbi->s_partmaps[i];
1244
1245                 if (map->s_partition_num == partitionNumber &&
1246                     (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1247                      map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1248                      map->s_partition_type == UDF_METADATA_MAP25))
1249                         break;
1250         }
1251
1252         if (i >= sbi->s_partitions)
1253                 goto out_bh;
1254
1255         ret = udf_fill_partdesc_info(sb, p, i);
1256         if (ret)
1257                 goto out_bh;
1258
1259         if (map->s_partition_type == UDF_METADATA_MAP25) {
1260                 ret = udf_load_metadata_files(sb, i);
1261                 if (ret) {
1262                         udf_err(sb, "error loading MetaData partition map %d\n",
1263                                 i);
1264                         goto out_bh;
1265                 }
1266         } else {
1267                 ret = udf_load_vat(sb, i, type1_idx);
1268                 if (ret)
1269                         goto out_bh;
1270                 /*
1271                  * Mark filesystem read-only if we have a partition with
1272                  * virtual map since we don't handle writing to it (we
1273                  * overwrite blocks instead of relocating them).
1274                  */
1275                 sb->s_flags |= MS_RDONLY;
1276                 pr_notice("Filesystem marked read-only because writing to pseudooverwrite partition is not implemented\n");
1277         }
1278 out_bh:
1279         /* In case loading failed, we handle cleanup in udf_fill_super */
1280         brelse(bh);
1281         return ret;
1282 }
1283
1284 static int udf_load_sparable_map(struct super_block *sb,
1285                                  struct udf_part_map *map,
1286                                  struct sparablePartitionMap *spm)
1287 {
1288         uint32_t loc;
1289         uint16_t ident;
1290         struct sparingTable *st;
1291         struct udf_sparing_data *sdata = &map->s_type_specific.s_sparing;
1292         int i;
1293         struct buffer_head *bh;
1294
1295         map->s_partition_type = UDF_SPARABLE_MAP15;
1296         sdata->s_packet_len = le16_to_cpu(spm->packetLength);
1297         if (!is_power_of_2(sdata->s_packet_len)) {
1298                 udf_err(sb, "error loading logical volume descriptor: "
1299                         "Invalid packet length %u\n",
1300                         (unsigned)sdata->s_packet_len);
1301                 return -EIO;
1302         }
1303         if (spm->numSparingTables > 4) {
1304                 udf_err(sb, "error loading logical volume descriptor: "
1305                         "Too many sparing tables (%d)\n",
1306                         (int)spm->numSparingTables);
1307                 return -EIO;
1308         }
1309
1310         for (i = 0; i < spm->numSparingTables; i++) {
1311                 loc = le32_to_cpu(spm->locSparingTable[i]);
1312                 bh = udf_read_tagged(sb, loc, loc, &ident);
1313                 if (!bh)
1314                         continue;
1315
1316                 st = (struct sparingTable *)bh->b_data;
1317                 if (ident != 0 ||
1318                     strncmp(st->sparingIdent.ident, UDF_ID_SPARING,
1319                             strlen(UDF_ID_SPARING)) ||
1320                     sizeof(*st) + le16_to_cpu(st->reallocationTableLen) >
1321                                                         sb->s_blocksize) {
1322                         brelse(bh);
1323                         continue;
1324                 }
1325
1326                 sdata->s_spar_map[i] = bh;
1327         }
1328         map->s_partition_func = udf_get_pblock_spar15;
1329         return 0;
1330 }
1331
1332 static int udf_load_logicalvol(struct super_block *sb, sector_t block,
1333                                struct kernel_lb_addr *fileset)
1334 {
1335         struct logicalVolDesc *lvd;
1336         int i, offset;
1337         uint8_t type;
1338         struct udf_sb_info *sbi = UDF_SB(sb);
1339         struct genericPartitionMap *gpm;
1340         uint16_t ident;
1341         struct buffer_head *bh;
1342         unsigned int table_len;
1343         int ret = 0;
1344
1345         bh = udf_read_tagged(sb, block, block, &ident);
1346         if (!bh)
1347                 return 1;
1348         BUG_ON(ident != TAG_IDENT_LVD);
1349         lvd = (struct logicalVolDesc *)bh->b_data;
1350         table_len = le32_to_cpu(lvd->mapTableLength);
1351         if (table_len > sb->s_blocksize - sizeof(*lvd)) {
1352                 udf_err(sb, "error loading logical volume descriptor: "
1353                         "Partition table too long (%u > %lu)\n", table_len,
1354                         sb->s_blocksize - sizeof(*lvd));
1355                 ret = 1;
1356                 goto out_bh;
1357         }
1358
1359         ret = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1360         if (ret)
1361                 goto out_bh;
1362
1363         for (i = 0, offset = 0;
1364              i < sbi->s_partitions && offset < table_len;
1365              i++, offset += gpm->partitionMapLength) {
1366                 struct udf_part_map *map = &sbi->s_partmaps[i];
1367                 gpm = (struct genericPartitionMap *)
1368                                 &(lvd->partitionMaps[offset]);
1369                 type = gpm->partitionMapType;
1370                 if (type == 1) {
1371                         struct genericPartitionMap1 *gpm1 =
1372                                 (struct genericPartitionMap1 *)gpm;
1373                         map->s_partition_type = UDF_TYPE1_MAP15;
1374                         map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1375                         map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1376                         map->s_partition_func = NULL;
1377                 } else if (type == 2) {
1378                         struct udfPartitionMap2 *upm2 =
1379                                                 (struct udfPartitionMap2 *)gpm;
1380                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1381                                                 strlen(UDF_ID_VIRTUAL))) {
1382                                 u16 suf =
1383                                         le16_to_cpu(((__le16 *)upm2->partIdent.
1384                                                         identSuffix)[0]);
1385                                 if (suf < 0x0200) {
1386                                         map->s_partition_type =
1387                                                         UDF_VIRTUAL_MAP15;
1388                                         map->s_partition_func =
1389                                                         udf_get_pblock_virt15;
1390                                 } else {
1391                                         map->s_partition_type =
1392                                                         UDF_VIRTUAL_MAP20;
1393                                         map->s_partition_func =
1394                                                         udf_get_pblock_virt20;
1395                                 }
1396                         } else if (!strncmp(upm2->partIdent.ident,
1397                                                 UDF_ID_SPARABLE,
1398                                                 strlen(UDF_ID_SPARABLE))) {
1399                                 if (udf_load_sparable_map(sb, map,
1400                                     (struct sparablePartitionMap *)gpm) < 0) {
1401                                         ret = 1;
1402                                         goto out_bh;
1403                                 }
1404                         } else if (!strncmp(upm2->partIdent.ident,
1405                                                 UDF_ID_METADATA,
1406                                                 strlen(UDF_ID_METADATA))) {
1407                                 struct udf_meta_data *mdata =
1408                                         &map->s_type_specific.s_metadata;
1409                                 struct metadataPartitionMap *mdm =
1410                                                 (struct metadataPartitionMap *)
1411                                                 &(lvd->partitionMaps[offset]);
1412                                 udf_debug("Parsing Logical vol part %d type %d  id=%s\n",
1413                                           i, type, UDF_ID_METADATA);
1414
1415                                 map->s_partition_type = UDF_METADATA_MAP25;
1416                                 map->s_partition_func = udf_get_pblock_meta25;
1417
1418                                 mdata->s_meta_file_loc   =
1419                                         le32_to_cpu(mdm->metadataFileLoc);
1420                                 mdata->s_mirror_file_loc =
1421                                         le32_to_cpu(mdm->metadataMirrorFileLoc);
1422                                 mdata->s_bitmap_file_loc =
1423                                         le32_to_cpu(mdm->metadataBitmapFileLoc);
1424                                 mdata->s_alloc_unit_size =
1425                                         le32_to_cpu(mdm->allocUnitSize);
1426                                 mdata->s_align_unit_size =
1427                                         le16_to_cpu(mdm->alignUnitSize);
1428                                 if (mdm->flags & 0x01)
1429                                         mdata->s_flags |= MF_DUPLICATE_MD;
1430
1431                                 udf_debug("Metadata Ident suffix=0x%x\n",
1432                                           le16_to_cpu(*(__le16 *)
1433                                                       mdm->partIdent.identSuffix));
1434                                 udf_debug("Metadata part num=%d\n",
1435                                           le16_to_cpu(mdm->partitionNum));
1436                                 udf_debug("Metadata part alloc unit size=%d\n",
1437                                           le32_to_cpu(mdm->allocUnitSize));
1438                                 udf_debug("Metadata file loc=%d\n",
1439                                           le32_to_cpu(mdm->metadataFileLoc));
1440                                 udf_debug("Mirror file loc=%d\n",
1441                                           le32_to_cpu(mdm->metadataMirrorFileLoc));
1442                                 udf_debug("Bitmap file loc=%d\n",
1443                                           le32_to_cpu(mdm->metadataBitmapFileLoc));
1444                                 udf_debug("Flags: %d %d\n",
1445                                           mdata->s_flags, mdm->flags);
1446                         } else {
1447                                 udf_debug("Unknown ident: %s\n",
1448                                           upm2->partIdent.ident);
1449                                 continue;
1450                         }
1451                         map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1452                         map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1453                 }
1454                 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1455                           i, map->s_partition_num, type, map->s_volumeseqnum);
1456         }
1457
1458         if (fileset) {
1459                 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
1460
1461                 *fileset = lelb_to_cpu(la->extLocation);
1462                 udf_debug("FileSet found in LogicalVolDesc at block=%d, partition=%d\n",
1463                           fileset->logicalBlockNum,
1464                           fileset->partitionReferenceNum);
1465         }
1466         if (lvd->integritySeqExt.extLength)
1467                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1468
1469 out_bh:
1470         brelse(bh);
1471         return ret;
1472 }
1473
1474 /*
1475  * udf_load_logicalvolint
1476  *
1477  */
1478 static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
1479 {
1480         struct buffer_head *bh = NULL;
1481         uint16_t ident;
1482         struct udf_sb_info *sbi = UDF_SB(sb);
1483         struct logicalVolIntegrityDesc *lvid;
1484
1485         while (loc.extLength > 0 &&
1486                (bh = udf_read_tagged(sb, loc.extLocation,
1487                                      loc.extLocation, &ident)) &&
1488                ident == TAG_IDENT_LVID) {
1489                 sbi->s_lvid_bh = bh;
1490                 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1491
1492                 if (lvid->nextIntegrityExt.extLength)
1493                         udf_load_logicalvolint(sb,
1494                                 leea_to_cpu(lvid->nextIntegrityExt));
1495
1496                 if (sbi->s_lvid_bh != bh)
1497                         brelse(bh);
1498                 loc.extLength -= sb->s_blocksize;
1499                 loc.extLocation++;
1500         }
1501         if (sbi->s_lvid_bh != bh)
1502                 brelse(bh);
1503 }
1504
1505 /*
1506  * udf_process_sequence
1507  *
1508  * PURPOSE
1509  *      Process a main/reserve volume descriptor sequence.
1510  *
1511  * PRE-CONDITIONS
1512  *      sb                      Pointer to _locked_ superblock.
1513  *      block                   First block of first extent of the sequence.
1514  *      lastblock               Lastblock of first extent of the sequence.
1515  *
1516  * HISTORY
1517  *      July 1, 1997 - Andrew E. Mileski
1518  *      Written, tested, and released.
1519  */
1520 static noinline int udf_process_sequence(struct super_block *sb, long block,
1521                                 long lastblock, struct kernel_lb_addr *fileset)
1522 {
1523         struct buffer_head *bh = NULL;
1524         struct udf_vds_record vds[VDS_POS_LENGTH];
1525         struct udf_vds_record *curr;
1526         struct generic_desc *gd;
1527         struct volDescPtr *vdp;
1528         int done = 0;
1529         uint32_t vdsn;
1530         uint16_t ident;
1531         long next_s = 0, next_e = 0;
1532
1533         memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1534
1535         /*
1536          * Read the main descriptor sequence and find which descriptors
1537          * are in it.
1538          */
1539         for (; (!done && block <= lastblock); block++) {
1540
1541                 bh = udf_read_tagged(sb, block, block, &ident);
1542                 if (!bh) {
1543                         udf_err(sb,
1544                                 "Block %llu of volume descriptor sequence is corrupted or we could not read it\n",
1545                                 (unsigned long long)block);
1546                         return 1;
1547                 }
1548
1549                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1550                 gd = (struct generic_desc *)bh->b_data;
1551                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1552                 switch (ident) {
1553                 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1554                         curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1555                         if (vdsn >= curr->volDescSeqNum) {
1556                                 curr->volDescSeqNum = vdsn;
1557                                 curr->block = block;
1558                         }
1559                         break;
1560                 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1561                         curr = &vds[VDS_POS_VOL_DESC_PTR];
1562                         if (vdsn >= curr->volDescSeqNum) {
1563                                 curr->volDescSeqNum = vdsn;
1564                                 curr->block = block;
1565
1566                                 vdp = (struct volDescPtr *)bh->b_data;
1567                                 next_s = le32_to_cpu(
1568                                         vdp->nextVolDescSeqExt.extLocation);
1569                                 next_e = le32_to_cpu(
1570                                         vdp->nextVolDescSeqExt.extLength);
1571                                 next_e = next_e >> sb->s_blocksize_bits;
1572                                 next_e += next_s;
1573                         }
1574                         break;
1575                 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1576                         curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1577                         if (vdsn >= curr->volDescSeqNum) {
1578                                 curr->volDescSeqNum = vdsn;
1579                                 curr->block = block;
1580                         }
1581                         break;
1582                 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1583                         curr = &vds[VDS_POS_PARTITION_DESC];
1584                         if (!curr->block)
1585                                 curr->block = block;
1586                         break;
1587                 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1588                         curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1589                         if (vdsn >= curr->volDescSeqNum) {
1590                                 curr->volDescSeqNum = vdsn;
1591                                 curr->block = block;
1592                         }
1593                         break;
1594                 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1595                         curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1596                         if (vdsn >= curr->volDescSeqNum) {
1597                                 curr->volDescSeqNum = vdsn;
1598                                 curr->block = block;
1599                         }
1600                         break;
1601                 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1602                         vds[VDS_POS_TERMINATING_DESC].block = block;
1603                         if (next_e) {
1604                                 block = next_s;
1605                                 lastblock = next_e;
1606                                 next_s = next_e = 0;
1607                         } else
1608                                 done = 1;
1609                         break;
1610                 }
1611                 brelse(bh);
1612         }
1613         /*
1614          * Now read interesting descriptors again and process them
1615          * in a suitable order
1616          */
1617         if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1618                 udf_err(sb, "Primary Volume Descriptor not found!\n");
1619                 return 1;
1620         }
1621         if (udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block))
1622                 return 1;
1623
1624         if (vds[VDS_POS_LOGICAL_VOL_DESC].block && udf_load_logicalvol(sb,
1625             vds[VDS_POS_LOGICAL_VOL_DESC].block, fileset))
1626                 return 1;
1627
1628         if (vds[VDS_POS_PARTITION_DESC].block) {
1629                 /*
1630                  * We rescan the whole descriptor sequence to find
1631                  * partition descriptor blocks and process them.
1632                  */
1633                 for (block = vds[VDS_POS_PARTITION_DESC].block;
1634                      block < vds[VDS_POS_TERMINATING_DESC].block;
1635                      block++)
1636                         if (udf_load_partdesc(sb, block))
1637                                 return 1;
1638         }
1639
1640         return 0;
1641 }
1642
1643 static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh,
1644                              struct kernel_lb_addr *fileset)
1645 {
1646         struct anchorVolDescPtr *anchor;
1647         long main_s, main_e, reserve_s, reserve_e;
1648
1649         anchor = (struct anchorVolDescPtr *)bh->b_data;
1650
1651         /* Locate the main sequence */
1652         main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1653         main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1654         main_e = main_e >> sb->s_blocksize_bits;
1655         main_e += main_s;
1656
1657         /* Locate the reserve sequence */
1658         reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1659         reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1660         reserve_e = reserve_e >> sb->s_blocksize_bits;
1661         reserve_e += reserve_s;
1662
1663         /* Process the main & reserve sequences */
1664         /* responsible for finding the PartitionDesc(s) */
1665         if (!udf_process_sequence(sb, main_s, main_e, fileset))
1666                 return 1;
1667         udf_sb_free_partitions(sb);
1668         if (!udf_process_sequence(sb, reserve_s, reserve_e, fileset))
1669                 return 1;
1670         udf_sb_free_partitions(sb);
1671         return 0;
1672 }
1673
1674 /*
1675  * Check whether there is an anchor block in the given block and
1676  * load Volume Descriptor Sequence if so.
1677  */
1678 static int udf_check_anchor_block(struct super_block *sb, sector_t block,
1679                                   struct kernel_lb_addr *fileset)
1680 {
1681         struct buffer_head *bh;
1682         uint16_t ident;
1683         int ret;
1684
1685         if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
1686             udf_fixed_to_variable(block) >=
1687             sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits)
1688                 return 0;
1689
1690         bh = udf_read_tagged(sb, block, block, &ident);
1691         if (!bh)
1692                 return 0;
1693         if (ident != TAG_IDENT_AVDP) {
1694                 brelse(bh);
1695                 return 0;
1696         }
1697         ret = udf_load_sequence(sb, bh, fileset);
1698         brelse(bh);
1699         return ret;
1700 }
1701
1702 /* Search for an anchor volume descriptor pointer */
1703 static sector_t udf_scan_anchors(struct super_block *sb, sector_t lastblock,
1704                                  struct kernel_lb_addr *fileset)
1705 {
1706         sector_t last[6];
1707         int i;
1708         struct udf_sb_info *sbi = UDF_SB(sb);
1709         int last_count = 0;
1710
1711         /* First try user provided anchor */
1712         if (sbi->s_anchor) {
1713                 if (udf_check_anchor_block(sb, sbi->s_anchor, fileset))
1714                         return lastblock;
1715         }
1716         /*
1717          * according to spec, anchor is in either:
1718          *     block 256
1719          *     lastblock-256
1720          *     lastblock
1721          *  however, if the disc isn't closed, it could be 512.
1722          */
1723         if (udf_check_anchor_block(sb, sbi->s_session + 256, fileset))
1724                 return lastblock;
1725         /*
1726          * The trouble is which block is the last one. Drives often misreport
1727          * this so we try various possibilities.
1728          */
1729         last[last_count++] = lastblock;
1730         if (lastblock >= 1)
1731                 last[last_count++] = lastblock - 1;
1732         last[last_count++] = lastblock + 1;
1733         if (lastblock >= 2)
1734                 last[last_count++] = lastblock - 2;
1735         if (lastblock >= 150)
1736                 last[last_count++] = lastblock - 150;
1737         if (lastblock >= 152)
1738                 last[last_count++] = lastblock - 152;
1739
1740         for (i = 0; i < last_count; i++) {
1741                 if (last[i] >= sb->s_bdev->bd_inode->i_size >>
1742                                 sb->s_blocksize_bits)
1743                         continue;
1744                 if (udf_check_anchor_block(sb, last[i], fileset))
1745                         return last[i];
1746                 if (last[i] < 256)
1747                         continue;
1748                 if (udf_check_anchor_block(sb, last[i] - 256, fileset))
1749                         return last[i];
1750         }
1751
1752         /* Finally try block 512 in case media is open */
1753         if (udf_check_anchor_block(sb, sbi->s_session + 512, fileset))
1754                 return last[0];
1755         return 0;
1756 }
1757
1758 /*
1759  * Find an anchor volume descriptor and load Volume Descriptor Sequence from
1760  * area specified by it. The function expects sbi->s_lastblock to be the last
1761  * block on the media.
1762  *
1763  * Return 1 if ok, 0 if not found.
1764  *
1765  */
1766 static int udf_find_anchor(struct super_block *sb,
1767                            struct kernel_lb_addr *fileset)
1768 {
1769         sector_t lastblock;
1770         struct udf_sb_info *sbi = UDF_SB(sb);
1771
1772         lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1773         if (lastblock)
1774                 goto out;
1775
1776         /* No anchor found? Try VARCONV conversion of block numbers */
1777         UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
1778         /* Firstly, we try to not convert number of the last block */
1779         lastblock = udf_scan_anchors(sb,
1780                                 udf_variable_to_fixed(sbi->s_last_block),
1781                                 fileset);
1782         if (lastblock)
1783                 goto out;
1784
1785         /* Secondly, we try with converted number of the last block */
1786         lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1787         if (!lastblock) {
1788                 /* VARCONV didn't help. Clear it. */
1789                 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
1790                 return 0;
1791         }
1792 out:
1793         sbi->s_last_block = lastblock;
1794         return 1;
1795 }
1796
1797 /*
1798  * Check Volume Structure Descriptor, find Anchor block and load Volume
1799  * Descriptor Sequence
1800  */
1801 static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
1802                         int silent, struct kernel_lb_addr *fileset)
1803 {
1804         struct udf_sb_info *sbi = UDF_SB(sb);
1805         loff_t nsr_off;
1806
1807         if (!sb_set_blocksize(sb, uopt->blocksize)) {
1808                 if (!silent)
1809                         udf_warn(sb, "Bad block size\n");
1810                 return 0;
1811         }
1812         sbi->s_last_block = uopt->lastblock;
1813         if (!uopt->novrs) {
1814                 /* Check that it is NSR02 compliant */
1815                 nsr_off = udf_check_vsd(sb);
1816                 if (!nsr_off) {
1817                         if (!silent)
1818                                 udf_warn(sb, "No VRS found\n");
1819                         return 0;
1820                 }
1821                 if (nsr_off == -1)
1822                         udf_debug("Failed to read byte 32768. Assuming open disc. Skipping validity check\n");
1823                 if (!sbi->s_last_block)
1824                         sbi->s_last_block = udf_get_last_block(sb);
1825         } else {
1826                 udf_debug("Validity check skipped because of novrs option\n");
1827         }
1828
1829         /* Look for anchor block and load Volume Descriptor Sequence */
1830         sbi->s_anchor = uopt->anchor;
1831         if (!udf_find_anchor(sb, fileset)) {
1832                 if (!silent)
1833                         udf_warn(sb, "No anchor found\n");
1834                 return 0;
1835         }
1836         return 1;
1837 }
1838
1839 static void udf_open_lvid(struct super_block *sb)
1840 {
1841         struct udf_sb_info *sbi = UDF_SB(sb);
1842         struct buffer_head *bh = sbi->s_lvid_bh;
1843         struct logicalVolIntegrityDesc *lvid;
1844         struct logicalVolIntegrityDescImpUse *lvidiu;
1845
1846         if (!bh)
1847                 return;
1848
1849         mutex_lock(&sbi->s_alloc_mutex);
1850         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1851         lvidiu = udf_sb_lvidiu(sbi);
1852
1853         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1854         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1855         udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
1856                                 CURRENT_TIME);
1857         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN);
1858
1859         lvid->descTag.descCRC = cpu_to_le16(
1860                 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1861                         le16_to_cpu(lvid->descTag.descCRCLength)));
1862
1863         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1864         mark_buffer_dirty(bh);
1865         sbi->s_lvid_dirty = 0;
1866         mutex_unlock(&sbi->s_alloc_mutex);
1867         /* Make opening of filesystem visible on the media immediately */
1868         sync_dirty_buffer(bh);
1869 }
1870
1871 static void udf_close_lvid(struct super_block *sb)
1872 {
1873         struct udf_sb_info *sbi = UDF_SB(sb);
1874         struct buffer_head *bh = sbi->s_lvid_bh;
1875         struct logicalVolIntegrityDesc *lvid;
1876         struct logicalVolIntegrityDescImpUse *lvidiu;
1877
1878         if (!bh)
1879                 return;
1880
1881         mutex_lock(&sbi->s_alloc_mutex);
1882         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1883         lvidiu = udf_sb_lvidiu(sbi);
1884         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1885         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1886         udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
1887         if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1888                 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1889         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1890                 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1891         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
1892                 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
1893         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1894
1895         lvid->descTag.descCRC = cpu_to_le16(
1896                         crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1897                                 le16_to_cpu(lvid->descTag.descCRCLength)));
1898
1899         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1900         /*
1901          * We set buffer uptodate unconditionally here to avoid spurious
1902          * warnings from mark_buffer_dirty() when previous EIO has marked
1903          * the buffer as !uptodate
1904          */
1905         set_buffer_uptodate(bh);
1906         mark_buffer_dirty(bh);
1907         sbi->s_lvid_dirty = 0;
1908         mutex_unlock(&sbi->s_alloc_mutex);
1909         /* Make closing of filesystem visible on the media immediately */
1910         sync_dirty_buffer(bh);
1911 }
1912
1913 u64 lvid_get_unique_id(struct super_block *sb)
1914 {
1915         struct buffer_head *bh;
1916         struct udf_sb_info *sbi = UDF_SB(sb);
1917         struct logicalVolIntegrityDesc *lvid;
1918         struct logicalVolHeaderDesc *lvhd;
1919         u64 uniqueID;
1920         u64 ret;
1921
1922         bh = sbi->s_lvid_bh;
1923         if (!bh)
1924                 return 0;
1925
1926         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1927         lvhd = (struct logicalVolHeaderDesc *)lvid->logicalVolContentsUse;
1928
1929         mutex_lock(&sbi->s_alloc_mutex);
1930         ret = uniqueID = le64_to_cpu(lvhd->uniqueID);
1931         if (!(++uniqueID & 0xFFFFFFFF))
1932                 uniqueID += 16;
1933         lvhd->uniqueID = cpu_to_le64(uniqueID);
1934         mutex_unlock(&sbi->s_alloc_mutex);
1935         mark_buffer_dirty(bh);
1936
1937         return ret;
1938 }
1939
1940 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1941 {
1942         int ret;
1943         struct inode *inode = NULL;
1944         struct udf_options uopt;
1945         struct kernel_lb_addr rootdir, fileset;
1946         struct udf_sb_info *sbi;
1947
1948         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1949         uopt.uid = INVALID_UID;
1950         uopt.gid = INVALID_GID;
1951         uopt.umask = 0;
1952         uopt.fmode = UDF_INVALID_MODE;
1953         uopt.dmode = UDF_INVALID_MODE;
1954
1955         sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1956         if (!sbi)
1957                 return -ENOMEM;
1958
1959         sb->s_fs_info = sbi;
1960
1961         mutex_init(&sbi->s_alloc_mutex);
1962
1963         if (!udf_parse_options((char *)options, &uopt, false))
1964                 goto error_out;
1965
1966         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1967             uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
1968                 udf_err(sb, "utf8 cannot be combined with iocharset\n");
1969                 goto error_out;
1970         }
1971 #ifdef CONFIG_UDF_NLS
1972         if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1973                 uopt.nls_map = load_nls_default();
1974                 if (!uopt.nls_map)
1975                         uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1976                 else
1977                         udf_debug("Using default NLS map\n");
1978         }
1979 #endif
1980         if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1981                 uopt.flags |= (1 << UDF_FLAG_UTF8);
1982
1983         fileset.logicalBlockNum = 0xFFFFFFFF;
1984         fileset.partitionReferenceNum = 0xFFFF;
1985
1986         sbi->s_flags = uopt.flags;
1987         sbi->s_uid = uopt.uid;
1988         sbi->s_gid = uopt.gid;
1989         sbi->s_umask = uopt.umask;
1990         sbi->s_fmode = uopt.fmode;
1991         sbi->s_dmode = uopt.dmode;
1992         sbi->s_nls_map = uopt.nls_map;
1993         rwlock_init(&sbi->s_cred_lock);
1994
1995         if (uopt.session == 0xFFFFFFFF)
1996                 sbi->s_session = udf_get_last_session(sb);
1997         else
1998                 sbi->s_session = uopt.session;
1999
2000         udf_debug("Multi-session=%d\n", sbi->s_session);
2001
2002         /* Fill in the rest of the superblock */
2003         sb->s_op = &udf_sb_ops;
2004         sb->s_export_op = &udf_export_ops;
2005
2006         sb->s_magic = UDF_SUPER_MAGIC;
2007         sb->s_time_gran = 1000;
2008
2009         if (uopt.flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) {
2010                 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
2011         } else {
2012                 uopt.blocksize = bdev_logical_block_size(sb->s_bdev);
2013                 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
2014                 if (!ret && uopt.blocksize != UDF_DEFAULT_BLOCKSIZE) {
2015                         if (!silent)
2016                                 pr_notice("Rescanning with blocksize %d\n",
2017                                           UDF_DEFAULT_BLOCKSIZE);
2018                         brelse(sbi->s_lvid_bh);
2019                         sbi->s_lvid_bh = NULL;
2020                         uopt.blocksize = UDF_DEFAULT_BLOCKSIZE;
2021                         ret = udf_load_vrs(sb, &uopt, silent, &fileset);
2022                 }
2023         }
2024         if (!ret) {
2025                 udf_warn(sb, "No partition found (1)\n");
2026                 goto error_out;
2027         }
2028
2029         udf_debug("Lastblock=%d\n", sbi->s_last_block);
2030
2031         if (sbi->s_lvid_bh) {
2032                 struct logicalVolIntegrityDescImpUse *lvidiu =
2033                                                         udf_sb_lvidiu(sbi);
2034                 uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
2035                 uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
2036                 /* uint16_t maxUDFWriteRev =
2037                                 le16_to_cpu(lvidiu->maxUDFWriteRev); */
2038
2039                 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
2040                         udf_err(sb, "minUDFReadRev=%x (max is %x)\n",
2041                                 le16_to_cpu(lvidiu->minUDFReadRev),
2042                                 UDF_MAX_READ_VERSION);
2043                         goto error_out;
2044                 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
2045                         sb->s_flags |= MS_RDONLY;
2046
2047                 sbi->s_udfrev = minUDFWriteRev;
2048
2049                 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
2050                         UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
2051                 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
2052                         UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
2053         }
2054
2055         if (!sbi->s_partitions) {
2056                 udf_warn(sb, "No partition found (2)\n");
2057                 goto error_out;
2058         }
2059
2060         if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
2061                         UDF_PART_FLAG_READ_ONLY) {
2062                 pr_notice("Partition marked readonly; forcing readonly mount\n");
2063                 sb->s_flags |= MS_RDONLY;
2064         }
2065
2066         if (udf_find_fileset(sb, &fileset, &rootdir)) {
2067                 udf_warn(sb, "No fileset found\n");
2068                 goto error_out;
2069         }
2070
2071         if (!silent) {
2072                 struct timestamp ts;
2073                 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
2074                 udf_info("Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
2075                          sbi->s_volume_ident,
2076                          le16_to_cpu(ts.year), ts.month, ts.day,
2077                          ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
2078         }
2079         if (!(sb->s_flags & MS_RDONLY))
2080                 udf_open_lvid(sb);
2081
2082         /* Assign the root inode */
2083         /* assign inodes by physical block number */
2084         /* perhaps it's not extensible enough, but for now ... */
2085         inode = udf_iget(sb, &rootdir);
2086         if (!inode) {
2087                 udf_err(sb, "Error in udf_iget, block=%d, partition=%d\n",
2088                        rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
2089                 goto error_out;
2090         }
2091
2092         /* Allocate a dentry for the root inode */
2093         sb->s_root = d_make_root(inode);
2094         if (!sb->s_root) {
2095                 udf_err(sb, "Couldn't allocate root dentry\n");
2096                 goto error_out;
2097         }
2098         sb->s_maxbytes = MAX_LFS_FILESIZE;
2099         sb->s_max_links = UDF_MAX_LINKS;
2100         return 0;
2101
2102 error_out:
2103         if (sbi->s_vat_inode)
2104                 iput(sbi->s_vat_inode);
2105 #ifdef CONFIG_UDF_NLS
2106         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2107                 unload_nls(sbi->s_nls_map);
2108 #endif
2109         if (!(sb->s_flags & MS_RDONLY))
2110                 udf_close_lvid(sb);
2111         brelse(sbi->s_lvid_bh);
2112         udf_sb_free_partitions(sb);
2113         kfree(sbi);
2114         sb->s_fs_info = NULL;
2115
2116         return -EINVAL;
2117 }
2118
2119 void _udf_err(struct super_block *sb, const char *function,
2120               const char *fmt, ...)
2121 {
2122         struct va_format vaf;
2123         va_list args;
2124
2125         va_start(args, fmt);
2126
2127         vaf.fmt = fmt;
2128         vaf.va = &args;
2129
2130         pr_err("error (device %s): %s: %pV", sb->s_id, function, &vaf);
2131
2132         va_end(args);
2133 }
2134
2135 void _udf_warn(struct super_block *sb, const char *function,
2136                const char *fmt, ...)
2137 {
2138         struct va_format vaf;
2139         va_list args;
2140
2141         va_start(args, fmt);
2142
2143         vaf.fmt = fmt;
2144         vaf.va = &args;
2145
2146         pr_warn("warning (device %s): %s: %pV", sb->s_id, function, &vaf);
2147
2148         va_end(args);
2149 }
2150
2151 static void udf_put_super(struct super_block *sb)
2152 {
2153         struct udf_sb_info *sbi;
2154
2155         sbi = UDF_SB(sb);
2156
2157         if (sbi->s_vat_inode)
2158                 iput(sbi->s_vat_inode);
2159 #ifdef CONFIG_UDF_NLS
2160         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2161                 unload_nls(sbi->s_nls_map);
2162 #endif
2163         if (!(sb->s_flags & MS_RDONLY))
2164                 udf_close_lvid(sb);
2165         brelse(sbi->s_lvid_bh);
2166         udf_sb_free_partitions(sb);
2167         kfree(sb->s_fs_info);
2168         sb->s_fs_info = NULL;
2169 }
2170
2171 static int udf_sync_fs(struct super_block *sb, int wait)
2172 {
2173         struct udf_sb_info *sbi = UDF_SB(sb);
2174
2175         mutex_lock(&sbi->s_alloc_mutex);
2176         if (sbi->s_lvid_dirty) {
2177                 /*
2178                  * Blockdevice will be synced later so we don't have to submit
2179                  * the buffer for IO
2180                  */
2181                 mark_buffer_dirty(sbi->s_lvid_bh);
2182                 sbi->s_lvid_dirty = 0;
2183         }
2184         mutex_unlock(&sbi->s_alloc_mutex);
2185
2186         return 0;
2187 }
2188
2189 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
2190 {
2191         struct super_block *sb = dentry->d_sb;
2192         struct udf_sb_info *sbi = UDF_SB(sb);
2193         struct logicalVolIntegrityDescImpUse *lvidiu;
2194         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
2195
2196         if (sbi->s_lvid_bh != NULL)
2197                 lvidiu = udf_sb_lvidiu(sbi);
2198         else
2199                 lvidiu = NULL;
2200
2201         buf->f_type = UDF_SUPER_MAGIC;
2202         buf->f_bsize = sb->s_blocksize;
2203         buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
2204         buf->f_bfree = udf_count_free(sb);
2205         buf->f_bavail = buf->f_bfree;
2206         buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2207                                           le32_to_cpu(lvidiu->numDirs)) : 0)
2208                         + buf->f_bfree;
2209         buf->f_ffree = buf->f_bfree;
2210         buf->f_namelen = UDF_NAME_LEN - 2;
2211         buf->f_fsid.val[0] = (u32)id;
2212         buf->f_fsid.val[1] = (u32)(id >> 32);
2213
2214         return 0;
2215 }
2216
2217 static unsigned int udf_count_free_bitmap(struct super_block *sb,
2218                                           struct udf_bitmap *bitmap)
2219 {
2220         struct buffer_head *bh = NULL;
2221         unsigned int accum = 0;
2222         int index;
2223         int block = 0, newblock;
2224         struct kernel_lb_addr loc;
2225         uint32_t bytes;
2226         uint8_t *ptr;
2227         uint16_t ident;
2228         struct spaceBitmapDesc *bm;
2229
2230         loc.logicalBlockNum = bitmap->s_extPosition;
2231         loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
2232         bh = udf_read_ptagged(sb, &loc, 0, &ident);
2233
2234         if (!bh) {
2235                 udf_err(sb, "udf_count_free failed\n");
2236                 goto out;
2237         } else if (ident != TAG_IDENT_SBD) {
2238                 brelse(bh);
2239                 udf_err(sb, "udf_count_free failed\n");
2240                 goto out;
2241         }
2242
2243         bm = (struct spaceBitmapDesc *)bh->b_data;
2244         bytes = le32_to_cpu(bm->numOfBytes);
2245         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2246         ptr = (uint8_t *)bh->b_data;
2247
2248         while (bytes > 0) {
2249                 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2250                 accum += bitmap_weight((const unsigned long *)(ptr + index),
2251                                         cur_bytes * 8);
2252                 bytes -= cur_bytes;
2253                 if (bytes) {
2254                         brelse(bh);
2255                         newblock = udf_get_lb_pblock(sb, &loc, ++block);
2256                         bh = udf_tread(sb, newblock);
2257                         if (!bh) {
2258                                 udf_debug("read failed\n");
2259                                 goto out;
2260                         }
2261                         index = 0;
2262                         ptr = (uint8_t *)bh->b_data;
2263                 }
2264         }
2265         brelse(bh);
2266 out:
2267         return accum;
2268 }
2269
2270 static unsigned int udf_count_free_table(struct super_block *sb,
2271                                          struct inode *table)
2272 {
2273         unsigned int accum = 0;
2274         uint32_t elen;
2275         struct kernel_lb_addr eloc;
2276         int8_t etype;
2277         struct extent_position epos;
2278
2279         mutex_lock(&UDF_SB(sb)->s_alloc_mutex);
2280         epos.block = UDF_I(table)->i_location;
2281         epos.offset = sizeof(struct unallocSpaceEntry);
2282         epos.bh = NULL;
2283
2284         while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2285                 accum += (elen >> table->i_sb->s_blocksize_bits);
2286
2287         brelse(epos.bh);
2288         mutex_unlock(&UDF_SB(sb)->s_alloc_mutex);
2289
2290         return accum;
2291 }
2292
2293 static unsigned int udf_count_free(struct super_block *sb)
2294 {
2295         unsigned int accum = 0;
2296         struct udf_sb_info *sbi;
2297         struct udf_part_map *map;
2298
2299         sbi = UDF_SB(sb);
2300         if (sbi->s_lvid_bh) {
2301                 struct logicalVolIntegrityDesc *lvid =
2302                         (struct logicalVolIntegrityDesc *)
2303                         sbi->s_lvid_bh->b_data;
2304                 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
2305                         accum = le32_to_cpu(
2306                                         lvid->freeSpaceTable[sbi->s_partition]);
2307                         if (accum == 0xFFFFFFFF)
2308                                 accum = 0;
2309                 }
2310         }
2311
2312         if (accum)
2313                 return accum;
2314
2315         map = &sbi->s_partmaps[sbi->s_partition];
2316         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2317                 accum += udf_count_free_bitmap(sb,
2318                                                map->s_uspace.s_bitmap);
2319         }
2320         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
2321                 accum += udf_count_free_bitmap(sb,
2322                                                map->s_fspace.s_bitmap);
2323         }
2324         if (accum)
2325                 return accum;
2326
2327         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2328                 accum += udf_count_free_table(sb,
2329                                               map->s_uspace.s_table);
2330         }
2331         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
2332                 accum += udf_count_free_table(sb,
2333                                               map->s_fspace.s_table);
2334         }
2335
2336         return accum;
2337 }