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