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         ei->cached_extent.lstart = -1;
 138         spin_lock_init(&ei->i_extent_cache_lock);
 139
 140         return &ei->vfs_inode;
 141 }
 142
 143 static void udf_i_callback(struct rcu_head *head)
 144 {
 145         struct inode *inode = container_of(head, struct inode, i_rcu);
 146         kmem_cache_free(udf_inode_cachep, UDF_I(inode));
 147 }
 148
 149 static void udf_destroy_inode(struct inode *inode)
 150 {
 151         call_rcu(&inode->i_rcu, udf_i_callback);
 152 }
 153
 154 static void init_once(void *foo)
 155 {
 156         struct udf_inode_info *ei = (struct udf_inode_info *)foo;
 157
 158         ei->i_ext.i_data = NULL;
 159         inode_init_once(&ei->vfs_inode);
 160 }
 161
 162 static int init_inodecache(void)
 163 {
 164         udf_inode_cachep = kmem_cache_create("udf_inode_cache",
 165                                              sizeof(struct udf_inode_info),
 166                                              0, (SLAB_RECLAIM_ACCOUNT |
 167                                                  SLAB_MEM_SPREAD),
 168                                              init_once);
 169         if (!udf_inode_cachep)
 170                 return -ENOMEM;
 171         return 0;
 172 }
 173
 174 static void destroy_inodecache(void)
 175 {
 176         /*
 177          * Make sure all delayed rcu free inodes are flushed before we
 178          * destroy cache.
 179          */
 180         rcu_barrier();
 181         kmem_cache_destroy(udf_inode_cachep);
 182 }
 183
 184 /* Superblock operations */
 185 static const struct super_operations udf_sb_ops = {
 186         .alloc_inode    = udf_alloc_inode,
 187         .destroy_inode  = udf_destroy_inode,
 188         .write_inode    = udf_write_inode,
 189         .evict_inode    = udf_evict_inode,
 190         .put_super      = udf_put_super,
 191         .sync_fs        = udf_sync_fs,
 192         .statfs         = udf_statfs,
 193         .remount_fs     = udf_remount_fs,
 194         .show_options   = udf_show_options,
 195 };
 196
 197 struct udf_options {
 198         unsigned char novrs;
 199         unsigned int blocksize;
 200         unsigned int session;
 201         unsigned int lastblock;
 202         unsigned int anchor;
 203         unsigned int volume;
 204         unsigned short partition;
 205         unsigned int fileset;
 206         unsigned int rootdir;
 207         unsigned int flags;
 208         umode_t umask;
 209         kgid_t gid;
 210         kuid_t uid;
 211         umode_t fmode;
 212         umode_t dmode;
 213         struct nls_table *nls_map;
 214 };
 215
 216 static int __init init_udf_fs(void)
 217 {
 218         int err;
 219
 220         err = init_inodecache();
 221         if (err)
 222                 goto out1;
 223         err = register_filesystem(&udf_fstype);
 224         if (err)
 225                 goto out;
 226
 227         return 0;
 228
 229 out:
 230         destroy_inodecache();
 231
 232 out1:
 233         return err;
 234 }
 235
 236 static void __exit exit_udf_fs(void)
 237 {
 238         unregister_filesystem(&udf_fstype);
 239         destroy_inodecache();
 240 }
 241
 242 module_init(init_udf_fs)
 243 module_exit(exit_udf_fs)
 244
 245 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
 246 {
 247         struct udf_sb_info *sbi = UDF_SB(sb);
 248
 249         sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map),
 250                                   GFP_KERNEL);
 251         if (!sbi->s_partmaps) {
 252                 udf_err(sb, "Unable to allocate space for %d partition maps\n",
 253                         count);
 254                 sbi->s_partitions = 0;
 255                 return -ENOMEM;
 256         }
 257
 258         sbi->s_partitions = count;
 259         return 0;
 260 }
 261
 262 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
 263 {
 264         int i;
 265         int nr_groups = bitmap->s_nr_groups;
 266         int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
 267                                                 nr_groups);
 268
 269         for (i = 0; i < nr_groups; i++)
 270                 if (bitmap->s_block_bitmap[i])
 271                         brelse(bitmap->s_block_bitmap[i]);
 272
 273         if (size <= PAGE_SIZE)
 274                 kfree(bitmap);
 275         else
 276                 vfree(bitmap);
 277 }
 278
 279 static void udf_free_partition(struct udf_part_map *map)
 280 {
 281         int i;
 282         struct udf_meta_data *mdata;
 283
 284         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
 285                 iput(map->s_uspace.s_table);
 286         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
 287                 iput(map->s_fspace.s_table);
 288         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
 289                 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
 290         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
 291                 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
 292         if (map->s_partition_type == UDF_SPARABLE_MAP15)
 293                 for (i = 0; i < 4; i++)
 294                         brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
 295         else if (map->s_partition_type == UDF_METADATA_MAP25) {
 296                 mdata = &map->s_type_specific.s_metadata;
 297                 iput(mdata->s_metadata_fe);
 298                 mdata->s_metadata_fe = NULL;
 299
 300                 iput(mdata->s_mirror_fe);
 301                 mdata->s_mirror_fe = NULL;
 302
 303                 iput(mdata->s_bitmap_fe);
 304                 mdata->s_bitmap_fe = NULL;
 305         }
 306 }
 307
 308 static void udf_sb_free_partitions(struct super_block *sb)
 309 {
 310         struct udf_sb_info *sbi = UDF_SB(sb);
 311         int i;
 312         if (sbi->s_partmaps == NULL)
 313                 return;
 314         for (i = 0; i < sbi->s_partitions; i++)
 315                 udf_free_partition(&sbi->s_partmaps[i]);
 316         kfree(sbi->s_partmaps);
 317         sbi->s_partmaps = NULL;
 318 }
 319
 320 static int udf_show_options(struct seq_file *seq, struct dentry *root)
 321 {
 322         struct super_block *sb = root->d_sb;
 323         struct udf_sb_info *sbi = UDF_SB(sb);
 324
 325         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
 326                 seq_puts(seq, ",nostrict");
 327         if (UDF_QUERY_FLAG(sb, UDF_FLAG_BLOCKSIZE_SET))
 328                 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
 329         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
 330                 seq_puts(seq, ",unhide");
 331         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
 332                 seq_puts(seq, ",undelete");
 333         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
 334                 seq_puts(seq, ",noadinicb");
 335         if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
 336                 seq_puts(seq, ",shortad");
 337         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
 338                 seq_puts(seq, ",uid=forget");
 339         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_IGNORE))
 340                 seq_puts(seq, ",uid=ignore");
 341         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
 342                 seq_puts(seq, ",gid=forget");
 343         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE))
 344                 seq_puts(seq, ",gid=ignore");
 345         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
 346                 seq_printf(seq, ",uid=%u", from_kuid(&init_user_ns, sbi->s_uid));
 347         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
 348                 seq_printf(seq, ",gid=%u", from_kgid(&init_user_ns, sbi->s_gid));
 349         if (sbi->s_umask != 0)
 350                 seq_printf(seq, ",umask=%ho", sbi->s_umask);
 351         if (sbi->s_fmode != UDF_INVALID_MODE)
 352                 seq_printf(seq, ",mode=%ho", sbi->s_fmode);
 353         if (sbi->s_dmode != UDF_INVALID_MODE)
 354                 seq_printf(seq, ",dmode=%ho", sbi->s_dmode);
 355         if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
 356                 seq_printf(seq, ",session=%u", sbi->s_session);
 357         if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
 358                 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
 359         if (sbi->s_anchor != 0)
 360                 seq_printf(seq, ",anchor=%u", sbi->s_anchor);
 361         /*
 362          * volume, partition, fileset and rootdir seem to be ignored
 363          * currently
 364          */
 365         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
 366                 seq_puts(seq, ",utf8");
 367         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
 368                 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
 369
 370         return 0;
 371 }
 372
 373 /*
 374  * udf_parse_options
 375  *
 376  * PURPOSE
 377  *      Parse mount options.
 378  *
 379  * DESCRIPTION
 380  *      The following mount options are supported:
 381  *
 382  *      gid=            Set the default group.
 383  *      umask=          Set the default umask.
 384  *      mode=           Set the default file permissions.
 385  *      dmode=          Set the default directory permissions.
 386  *      uid=            Set the default user.
 387  *      bs=             Set the block size.
 388  *      unhide          Show otherwise hidden files.
 389  *      undelete        Show deleted files in lists.
 390  *      adinicb         Embed data in the inode (default)
 391  *      noadinicb       Don't embed data in the inode
 392  *      shortad         Use short ad's
 393  *      longad          Use long ad's (default)
 394  *      nostrict        Unset strict conformance
 395  *      iocharset=      Set the NLS character set
 396  *
 397  *      The remaining are for debugging and disaster recovery:
 398  *
 399  *      novrs           Skip volume sequence recognition
 400  *
 401  *      The following expect a offset from 0.
 402  *
 403  *      session=        Set the CDROM session (default= last session)
 404  *      anchor=         Override standard anchor location. (default= 256)
 405  *      volume=         Override the VolumeDesc location. (unused)
 406  *      partition=      Override the PartitionDesc location. (unused)
 407  *      lastblock=      Set the last block of the filesystem/
 408  *
 409  *      The following expect a offset from the partition root.
 410  *
 411  *      fileset=        Override the fileset block location. (unused)
 412  *      rootdir=        Override the root directory location. (unused)
 413  *              WARNING: overriding the rootdir to a non-directory may
 414  *              yield highly unpredictable results.
 415  *
 416  * PRE-CONDITIONS
 417  *      options         Pointer to mount options string.
 418  *      uopts           Pointer to mount options variable.
 419  *
 420  * POST-CONDITIONS
 421  *      <return>        1       Mount options parsed okay.
 422  *      <return>        0       Error parsing mount options.
 423  *
 424  * HISTORY
 425  *      July 1, 1997 - Andrew E. Mileski
 426  *      Written, tested, and released.
 427  */
 428
 429 enum {
 430         Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
 431         Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
 432         Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
 433         Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
 434         Opt_rootdir, Opt_utf8, Opt_iocharset,
 435         Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore,
 436         Opt_fmode, Opt_dmode
 437 };
 438
 439 static const match_table_t tokens = {
 440         {Opt_novrs,     "novrs"},
 441         {Opt_nostrict,  "nostrict"},
 442         {Opt_bs,        "bs=%u"},
 443         {Opt_unhide,    "unhide"},
 444         {Opt_undelete,  "undelete"},
 445         {Opt_noadinicb, "noadinicb"},
 446         {Opt_adinicb,   "adinicb"},
 447         {Opt_shortad,   "shortad"},
 448         {Opt_longad,    "longad"},
 449         {Opt_uforget,   "uid=forget"},
 450         {Opt_uignore,   "uid=ignore"},
 451         {Opt_gforget,   "gid=forget"},
 452         {Opt_gignore,   "gid=ignore"},
 453         {Opt_gid,       "gid=%u"},
 454         {Opt_uid,       "uid=%u"},
 455         {Opt_umask,     "umask=%o"},
 456         {Opt_session,   "session=%u"},
 457         {Opt_lastblock, "lastblock=%u"},
 458         {Opt_anchor,    "anchor=%u"},
 459         {Opt_volume,    "volume=%u"},
 460         {Opt_partition, "partition=%u"},
 461         {Opt_fileset,   "fileset=%u"},
 462         {Opt_rootdir,   "rootdir=%u"},
 463         {Opt_utf8,      "utf8"},
 464         {Opt_iocharset, "iocharset=%s"},
 465         {Opt_fmode,     "mode=%o"},
 466         {Opt_dmode,     "dmode=%o"},
 467         {Opt_err,       NULL}
 468 };
 469
 470 static int udf_parse_options(char *options, struct udf_options *uopt,
 471                              bool remount)
 472 {
 473         char *p;
 474         int option;
 475
 476         uopt->novrs = 0;
 477         uopt->partition = 0xFFFF;
 478         uopt->session = 0xFFFFFFFF;
 479         uopt->lastblock = 0;
 480         uopt->anchor = 0;
 481         uopt->volume = 0xFFFFFFFF;
 482         uopt->rootdir = 0xFFFFFFFF;
 483         uopt->fileset = 0xFFFFFFFF;
 484         uopt->nls_map = NULL;
 485
 486         if (!options)
 487                 return 1;
 488
 489         while ((p = strsep(&options, ",")) != NULL) {
 490                 substring_t args[MAX_OPT_ARGS];
 491                 int token;
 492                 if (!*p)
 493                         continue;
 494
 495                 token = match_token(p, tokens, args);
 496                 switch (token) {
 497                 case Opt_novrs:
 498                         uopt->novrs = 1;
 499                         break;
 500                 case Opt_bs:
 501                         if (match_int(&args[0], &option))
 502                                 return 0;
 503                         uopt->blocksize = option;
 504                         uopt->flags |= (1 << UDF_FLAG_BLOCKSIZE_SET);
 505                         break;
 506                 case Opt_unhide:
 507                         uopt->flags |= (1 << UDF_FLAG_UNHIDE);
 508                         break;
 509                 case Opt_undelete:
 510                         uopt->flags |= (1 << UDF_FLAG_UNDELETE);
 511                         break;
 512                 case Opt_noadinicb:
 513                         uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
 514                         break;
 515                 case Opt_adinicb:
 516                         uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
 517                         break;
 518                 case Opt_shortad:
 519                         uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
 520                         break;
 521                 case Opt_longad:
 522                         uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
 523                         break;
 524                 case Opt_gid:
 525                         if (match_int(args, &option))
 526                                 return 0;
 527                         uopt->gid = make_kgid(current_user_ns(), option);
 528                         if (!gid_valid(uopt->gid))
 529                                 return 0;
 530                         uopt->flags |= (1 << UDF_FLAG_GID_SET);
 531                         break;
 532                 case Opt_uid:
 533                         if (match_int(args, &option))
 534                                 return 0;
 535                         uopt->uid = make_kuid(current_user_ns(), option);
 536                         if (!uid_valid(uopt->uid))
 537                                 return 0;
 538                         uopt->flags |= (1 << UDF_FLAG_UID_SET);
 539                         break;
 540                 case Opt_umask:
 541                         if (match_octal(args, &option))
 542                                 return 0;
 543                         uopt->umask = option;
 544                         break;
 545                 case Opt_nostrict:
 546                         uopt->flags &= ~(1 << UDF_FLAG_STRICT);
 547                         break;
 548                 case Opt_session:
 549                         if (match_int(args, &option))
 550                                 return 0;
 551                         uopt->session = option;
 552                         if (!remount)
 553                                 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
 554                         break;
 555                 case Opt_lastblock:
 556                         if (match_int(args, &option))
 557                                 return 0;
 558                         uopt->lastblock = option;
 559                         if (!remount)
 560                                 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
 561                         break;
 562                 case Opt_anchor:
 563                         if (match_int(args, &option))
 564                                 return 0;
 565                         uopt->anchor = option;
 566                         break;
 567                 case Opt_volume:
 568                         if (match_int(args, &option))
 569                                 return 0;
 570                         uopt->volume = option;
 571                         break;
 572                 case Opt_partition:
 573                         if (match_int(args, &option))
 574                                 return 0;
 575                         uopt->partition = option;
 576                         break;
 577                 case Opt_fileset:
 578                         if (match_int(args, &option))
 579                                 return 0;
 580                         uopt->fileset = option;
 581                         break;
 582                 case Opt_rootdir:
 583                         if (match_int(args, &option))
 584                                 return 0;
 585                         uopt->rootdir = option;
 586                         break;
 587                 case Opt_utf8:
 588                         uopt->flags |= (1 << UDF_FLAG_UTF8);
 589                         break;
 590 #ifdef CONFIG_UDF_NLS
 591                 case Opt_iocharset:
 592                         uopt->nls_map = load_nls(args[0].from);
 593                         uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
 594                         break;
 595 #endif
 596                 case Opt_uignore:
 597                         uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
 598                         break;
 599                 case Opt_uforget:
 600                         uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
 601                         break;
 602                 case Opt_gignore:
 603                         uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
 604                         break;
 605                 case Opt_gforget:
 606                         uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
 607                         break;
 608                 case Opt_fmode:
 609                         if (match_octal(args, &option))
 610                                 return 0;
 611                         uopt->fmode = option & 0777;
 612                         break;
 613                 case Opt_dmode:
 614                         if (match_octal(args, &option))
 615                                 return 0;
 616                         uopt->dmode = option & 0777;
 617                         break;
 618                 default:
 619                         pr_err("bad mount option \"%s\" or missing value\n", p);
 620                         return 0;
 621                 }
 622         }
 623         return 1;
 624 }
 625
 626 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
 627 {
 628         struct udf_options uopt;
 629         struct udf_sb_info *sbi = UDF_SB(sb);
 630         int error = 0;
 631
 632         uopt.flags = sbi->s_flags;
 633         uopt.uid   = sbi->s_uid;
 634         uopt.gid   = sbi->s_gid;
 635         uopt.umask = sbi->s_umask;
 636         uopt.fmode = sbi->s_fmode;
 637         uopt.dmode = sbi->s_dmode;
 638
 639         if (!udf_parse_options(options, &uopt, true))
 640                 return -EINVAL;
 641
 642         write_lock(&sbi->s_cred_lock);
 643         sbi->s_flags = uopt.flags;
 644         sbi->s_uid   = uopt.uid;
 645         sbi->s_gid   = uopt.gid;
 646         sbi->s_umask = uopt.umask;
 647         sbi->s_fmode = uopt.fmode;
 648         sbi->s_dmode = uopt.dmode;
 649         write_unlock(&sbi->s_cred_lock);
 650
 651         if (sbi->s_lvid_bh) {
 652                 int write_rev = le16_to_cpu(udf_sb_lvidiu(sbi)->minUDFWriteRev);
 653                 if (write_rev > UDF_MAX_WRITE_VERSION)
 654                         *flags |= MS_RDONLY;
 655         }
 656
 657         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 658                 goto out_unlock;
 659
 660         if (*flags & MS_RDONLY)
 661                 udf_close_lvid(sb);
 662         else
 663                 udf_open_lvid(sb);
 664
 665 out_unlock:
 666         return error;
 667 }
 668
 669 /* Check Volume Structure Descriptors (ECMA 167 2/9.1) */
 670 /* We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
 671 static loff_t udf_check_vsd(struct super_block *sb)
 672 {
 673         struct volStructDesc *vsd = NULL;
 674         loff_t sector = 32768;
 675         int sectorsize;
 676         struct buffer_head *bh = NULL;
 677         int nsr02 = 0;
 678         int nsr03 = 0;
 679         struct udf_sb_info *sbi;
 680
 681         sbi = UDF_SB(sb);
 682         if (sb->s_blocksize < sizeof(struct volStructDesc))
 683                 sectorsize = sizeof(struct volStructDesc);
 684         else
 685                 sectorsize = sb->s_blocksize;
 686
 687         sector += (sbi->s_session << sb->s_blocksize_bits);
 688
 689         udf_debug("Starting at sector %u (%ld byte sectors)\n",
 690                   (unsigned int)(sector >> sb->s_blocksize_bits),
 691                   sb->s_blocksize);
 692         /* Process the sequence (if applicable) */
 693         for (; !nsr02 && !nsr03; sector += sectorsize) {
 694                 /* Read a block */
 695                 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
 696                 if (!bh)
 697                         break;
 698
 699                 /* Look for ISO  descriptors */
 700                 vsd = (struct volStructDesc *)(bh->b_data +
 701                                               (sector & (sb->s_blocksize - 1)));
 702
 703                 if (vsd->stdIdent[0] == 0) {
 704                         brelse(bh);
 705                         break;
 706                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
 707                                     VSD_STD_ID_LEN)) {
 708                         switch (vsd->structType) {
 709                         case 0:
 710                                 udf_debug("ISO9660 Boot Record found\n");
 711                                 break;
 712                         case 1:
 713                                 udf_debug("ISO9660 Primary Volume Descriptor found\n");
 714                                 break;
 715                         case 2:
 716                                 udf_debug("ISO9660 Supplementary Volume Descriptor found\n");
 717                                 break;
 718                         case 3:
 719                                 udf_debug("ISO9660 Volume Partition Descriptor found\n");
 720                                 break;
 721                         case 255:
 722                                 udf_debug("ISO9660 Volume Descriptor Set Terminator found\n");
 723                                 break;
 724                         default:
 725                                 udf_debug("ISO9660 VRS (%u) found\n",
 726                                           vsd->structType);
 727                                 break;
 728                         }
 729                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
 730                                     VSD_STD_ID_LEN))
 731                         ; /* nothing */
 732                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
 733                                     VSD_STD_ID_LEN)) {
 734                         brelse(bh);
 735                         break;
 736                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
 737                                     VSD_STD_ID_LEN))
 738                         nsr02 = sector;
 739                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
 740                                     VSD_STD_ID_LEN))
 741                         nsr03 = sector;
 742                 brelse(bh);
 743         }
 744
 745         if (nsr03)
 746                 return nsr03;
 747         else if (nsr02)
 748                 return nsr02;
 749         else if (sector - (sbi->s_session << sb->s_blocksize_bits) == 32768)
 750                 return -1;
 751         else
 752                 return 0;
 753 }
 754
 755 static int udf_find_fileset(struct super_block *sb,
 756                             struct kernel_lb_addr *fileset,
 757                             struct kernel_lb_addr *root)
 758 {
 759         struct buffer_head *bh = NULL;
 760         long lastblock;
 761         uint16_t ident;
 762         struct udf_sb_info *sbi;
 763
 764         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
 765             fileset->partitionReferenceNum != 0xFFFF) {
 766                 bh = udf_read_ptagged(sb, fileset, 0, &ident);
 767
 768                 if (!bh) {
 769                         return 1;
 770                 } else if (ident != TAG_IDENT_FSD) {
 771                         brelse(bh);
 772                         return 1;
 773                 }
 774
 775         }
 776
 777         sbi = UDF_SB(sb);
 778         if (!bh) {
 779                 /* Search backwards through the partitions */
 780                 struct kernel_lb_addr newfileset;
 781
 782 /* --> cvg: FIXME - is it reasonable? */
 783                 return 1;
 784
 785                 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
 786                      (newfileset.partitionReferenceNum != 0xFFFF &&
 787                       fileset->logicalBlockNum == 0xFFFFFFFF &&
 788                       fileset->partitionReferenceNum == 0xFFFF);
 789                      newfileset.partitionReferenceNum--) {
 790                         lastblock = sbi->s_partmaps
 791                                         [newfileset.partitionReferenceNum]
 792                                                 .s_partition_len;
 793                         newfileset.logicalBlockNum = 0;
 794
 795                         do {
 796                                 bh = udf_read_ptagged(sb, &newfileset, 0,
 797                                                       &ident);
 798                                 if (!bh) {
 799                                         newfileset.logicalBlockNum++;
 800                                         continue;
 801                                 }
 802
 803                                 switch (ident) {
 804                                 case TAG_IDENT_SBD:
 805                                 {
 806                                         struct spaceBitmapDesc *sp;
 807                                         sp = (struct spaceBitmapDesc *)
 808                                                                 bh->b_data;
 809                                         newfileset.logicalBlockNum += 1 +
 810                                                 ((le32_to_cpu(sp->numOfBytes) +
 811                                                   sizeof(struct spaceBitmapDesc)
 812                                                   - 1) >> sb->s_blocksize_bits);
 813                                         brelse(bh);
 814                                         break;
 815                                 }
 816                                 case TAG_IDENT_FSD:
 817                                         *fileset = newfileset;
 818                                         break;
 819                                 default:
 820                                         newfileset.logicalBlockNum++;
 821                                         brelse(bh);
 822                                         bh = NULL;
 823                                         break;
 824                                 }
 825                         } while (newfileset.logicalBlockNum < lastblock &&
 826                                  fileset->logicalBlockNum == 0xFFFFFFFF &&
 827                                  fileset->partitionReferenceNum == 0xFFFF);
 828                 }
 829         }
 830
 831         if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
 832              fileset->partitionReferenceNum != 0xFFFF) && bh) {
 833                 udf_debug("Fileset at block=%d, partition=%d\n",
 834                           fileset->logicalBlockNum,
 835                           fileset->partitionReferenceNum);
 836
 837                 sbi->s_partition = fileset->partitionReferenceNum;
 838                 udf_load_fileset(sb, bh, root);
 839                 brelse(bh);
 840                 return 0;
 841         }
 842         return 1;
 843 }
 844
 845 static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
 846 {
 847         struct primaryVolDesc *pvoldesc;
 848         struct ustr *instr, *outstr;
 849         struct buffer_head *bh;
 850         uint16_t ident;
 851         int ret = 1;
 852
 853         instr = kmalloc(sizeof(struct ustr), GFP_NOFS);
 854         if (!instr)
 855                 return 1;
 856
 857         outstr = kmalloc(sizeof(struct ustr), GFP_NOFS);
 858         if (!outstr)
 859                 goto out1;
 860
 861         bh = udf_read_tagged(sb, block, block, &ident);
 862         if (!bh)
 863                 goto out2;
 864
 865         BUG_ON(ident != TAG_IDENT_PVD);
 866
 867         pvoldesc = (struct primaryVolDesc *)bh->b_data;
 868
 869         if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
 870                               pvoldesc->recordingDateAndTime)) {
 871 #ifdef UDFFS_DEBUG
 872                 struct timestamp *ts = &pvoldesc->recordingDateAndTime;
 873                 udf_debug("recording time %04u/%02u/%02u %02u:%02u (%x)\n",
 874                           le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
 875                           ts->minute, le16_to_cpu(ts->typeAndTimezone));
 876 #endif
 877         }
 878
 879         if (!udf_build_ustr(instr, pvoldesc->volIdent, 32))
 880                 if (udf_CS0toUTF8(outstr, instr)) {
 881                         strncpy(UDF_SB(sb)->s_volume_ident, outstr->u_name,
 882                                 outstr->u_len > 31 ? 31 : outstr->u_len);
 883                         udf_debug("volIdent[] = '%s'\n",
 884                                   UDF_SB(sb)->s_volume_ident);
 885                 }
 886
 887         if (!udf_build_ustr(instr, pvoldesc->volSetIdent, 128))
 888                 if (udf_CS0toUTF8(outstr, instr))
 889                         udf_debug("volSetIdent[] = '%s'\n", outstr->u_name);
 890
 891         brelse(bh);
 892         ret = 0;
 893 out2:
 894         kfree(outstr);
 895 out1:
 896         kfree(instr);
 897         return ret;
 898 }
 899
 900 struct inode *udf_find_metadata_inode_efe(struct super_block *sb,
 901                                         u32 meta_file_loc, u32 partition_num)
 902 {
 903         struct kernel_lb_addr addr;
 904         struct inode *metadata_fe;
 905
 906         addr.logicalBlockNum = meta_file_loc;
 907         addr.partitionReferenceNum = partition_num;
 908
 909         metadata_fe = udf_iget(sb, &addr);
 910
 911         if (metadata_fe == NULL)
 912                 udf_warn(sb, "metadata inode efe not found\n");
 913         else if (UDF_I(metadata_fe)->i_alloc_type != ICBTAG_FLAG_AD_SHORT) {
 914                 udf_warn(sb, "metadata inode efe does not have short allocation descriptors!\n");
 915                 iput(metadata_fe);
 916                 metadata_fe = NULL;
 917         }
 918
 919         return metadata_fe;
 920 }
 921
 922 static int udf_load_metadata_files(struct super_block *sb, int partition)
 923 {
 924         struct udf_sb_info *sbi = UDF_SB(sb);
 925         struct udf_part_map *map;
 926         struct udf_meta_data *mdata;
 927         struct kernel_lb_addr addr;
 928
 929         map = &sbi->s_partmaps[partition];
 930         mdata = &map->s_type_specific.s_metadata;
 931
 932         /* metadata address */
 933         udf_debug("Metadata file location: block = %d part = %d\n",
 934                   mdata->s_meta_file_loc, map->s_partition_num);
 935
 936         mdata->s_metadata_fe = udf_find_metadata_inode_efe(sb,
 937                 mdata->s_meta_file_loc, map->s_partition_num);
 938
 939         if (mdata->s_metadata_fe == NULL) {
 940                 /* mirror file entry */
 941                 udf_debug("Mirror metadata file location: block = %d part = %d\n",
 942                           mdata->s_mirror_file_loc, map->s_partition_num);
 943
 944                 mdata->s_mirror_fe = udf_find_metadata_inode_efe(sb,
 945                         mdata->s_mirror_file_loc, map->s_partition_num);
 946
 947                 if (mdata->s_mirror_fe == NULL) {
 948                         udf_err(sb, "Both metadata and mirror metadata inode efe can not found\n");
 949                         goto error_exit;
 950                 }
 951         }
 952
 953         /*
 954          * bitmap file entry
 955          * Note:
 956          * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
 957         */
 958         if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
 959                 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
 960                 addr.partitionReferenceNum = map->s_partition_num;
 961
 962                 udf_debug("Bitmap file location: block = %d part = %d\n",
 963                           addr.logicalBlockNum, addr.partitionReferenceNum);
 964
 965                 mdata->s_bitmap_fe = udf_iget(sb, &addr);
 966
 967                 if (mdata->s_bitmap_fe == NULL) {
 968                         if (sb->s_flags & MS_RDONLY)
 969                                 udf_warn(sb, "bitmap inode efe not found but it's ok since the disc is mounted read-only\n");
 970                         else {
 971                                 udf_err(sb, "bitmap inode efe not found and attempted read-write mount\n");
 972                                 goto error_exit;
 973                         }
 974                 }
 975         }
 976
 977         udf_debug("udf_load_metadata_files Ok\n");
 978
 979         return 0;
 980
 981 error_exit:
 982         return 1;
 983 }
 984
 985 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
 986                              struct kernel_lb_addr *root)
 987 {
 988         struct fileSetDesc *fset;
 989
 990         fset = (struct fileSetDesc *)bh->b_data;
 991
 992         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
 993
 994         UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
 995
 996         udf_debug("Rootdir at block=%d, partition=%d\n",
 997                   root->logicalBlockNum, root->partitionReferenceNum);
 998 }
 999
1000 int udf_compute_nr_groups(struct super_block *sb, u32 partition)
1001 {
1002         struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
1003         return DIV_ROUND_UP(map->s_partition_len +
1004                             (sizeof(struct spaceBitmapDesc) << 3),
1005                             sb->s_blocksize * 8);
1006 }
1007
1008 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
1009 {
1010         struct udf_bitmap *bitmap;
1011         int nr_groups;
1012         int size;
1013
1014         nr_groups = udf_compute_nr_groups(sb, index);
1015         size = sizeof(struct udf_bitmap) +
1016                 (sizeof(struct buffer_head *) * nr_groups);
1017
1018         if (size <= PAGE_SIZE)
1019                 bitmap = kzalloc(size, GFP_KERNEL);
1020         else
1021                 bitmap = vzalloc(size); /* TODO: get rid of vzalloc */
1022
1023         if (bitmap == NULL)
1024                 return NULL;
1025
1026         bitmap->s_block_bitmap = (struct buffer_head **)(bitmap + 1);
1027         bitmap->s_nr_groups = nr_groups;
1028         return bitmap;
1029 }
1030
1031 static int udf_fill_partdesc_info(struct super_block *sb,
1032                 struct partitionDesc *p, int p_index)
1033 {
1034         struct udf_part_map *map;
1035         struct udf_sb_info *sbi = UDF_SB(sb);
1036         struct partitionHeaderDesc *phd;
1037
1038         map = &sbi->s_partmaps[p_index];
1039
1040         map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
1041         map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
1042
1043         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
1044                 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
1045         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
1046                 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
1047         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
1048                 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
1049         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
1050                 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
1051
1052         udf_debug("Partition (%d type %x) starts at physical %d, block length %d\n",
1053                   p_index, map->s_partition_type,
1054                   map->s_partition_root, map->s_partition_len);
1055
1056         if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1057             strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
1058                 return 0;
1059
1060         phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1061         if (phd->unallocSpaceTable.extLength) {
1062                 struct kernel_lb_addr loc = {
1063                         .logicalBlockNum = le32_to_cpu(
1064                                 phd->unallocSpaceTable.extPosition),
1065                         .partitionReferenceNum = p_index,
1066                 };
1067
1068                 map->s_uspace.s_table = udf_iget(sb, &loc);
1069                 if (!map->s_uspace.s_table) {
1070                         udf_debug("cannot load unallocSpaceTable (part %d)\n",
1071                                   p_index);
1072                         return 1;
1073                 }
1074                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1075                 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
1076                           p_index, map->s_uspace.s_table->i_ino);
1077         }
1078
1079         if (phd->unallocSpaceBitmap.extLength) {
1080                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1081                 if (!bitmap)
1082                         return 1;
1083                 map->s_uspace.s_bitmap = bitmap;
1084                 bitmap->s_extLength = le32_to_cpu(
1085                                 phd->unallocSpaceBitmap.extLength);
1086                 bitmap->s_extPosition = le32_to_cpu(
1087                                 phd->unallocSpaceBitmap.extPosition);
1088                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1089                 udf_debug("unallocSpaceBitmap (part %d) @ %d\n",
1090                           p_index, bitmap->s_extPosition);
1091         }
1092
1093         if (phd->partitionIntegrityTable.extLength)
1094                 udf_debug("partitionIntegrityTable (part %d)\n", p_index);
1095
1096         if (phd->freedSpaceTable.extLength) {
1097                 struct kernel_lb_addr loc = {
1098                         .logicalBlockNum = le32_to_cpu(
1099                                 phd->freedSpaceTable.extPosition),
1100                         .partitionReferenceNum = p_index,
1101                 };
1102
1103                 map->s_fspace.s_table = udf_iget(sb, &loc);
1104                 if (!map->s_fspace.s_table) {
1105                         udf_debug("cannot load freedSpaceTable (part %d)\n",
1106                                   p_index);
1107                         return 1;
1108                 }
1109
1110                 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
1111                 udf_debug("freedSpaceTable (part %d) @ %ld\n",
1112                           p_index, map->s_fspace.s_table->i_ino);
1113         }
1114
1115         if (phd->freedSpaceBitmap.extLength) {
1116                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1117                 if (!bitmap)
1118                         return 1;
1119                 map->s_fspace.s_bitmap = bitmap;
1120                 bitmap->s_extLength = le32_to_cpu(
1121                                 phd->freedSpaceBitmap.extLength);
1122                 bitmap->s_extPosition = le32_to_cpu(
1123                                 phd->freedSpaceBitmap.extPosition);
1124                 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1125                 udf_debug("freedSpaceBitmap (part %d) @ %d\n",
1126                           p_index, bitmap->s_extPosition);
1127         }
1128         return 0;
1129 }
1130
1131 static void udf_find_vat_block(struct super_block *sb, int p_index,
1132                                int type1_index, sector_t start_block)
1133 {
1134         struct udf_sb_info *sbi = UDF_SB(sb);
1135         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1136         sector_t vat_block;
1137         struct kernel_lb_addr ino;
1138
1139         /*
1140          * VAT file entry is in the last recorded block. Some broken disks have
1141          * it a few blocks before so try a bit harder...
1142          */
1143         ino.partitionReferenceNum = type1_index;
1144         for (vat_block = start_block;
1145              vat_block >= map->s_partition_root &&
1146              vat_block >= start_block - 3 &&
1147              !sbi->s_vat_inode; vat_block--) {
1148                 ino.logicalBlockNum = vat_block - map->s_partition_root;
1149                 sbi->s_vat_inode = udf_iget(sb, &ino);
1150         }
1151 }
1152
1153 static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1154 {
1155         struct udf_sb_info *sbi = UDF_SB(sb);
1156         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1157         struct buffer_head *bh = NULL;
1158         struct udf_inode_info *vati;
1159         uint32_t pos;
1160         struct virtualAllocationTable20 *vat20;
1161         sector_t blocks = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
1162
1163         udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block);
1164         if (!sbi->s_vat_inode &&
1165             sbi->s_last_block != blocks - 1) {
1166                 pr_notice("Failed to read VAT inode from the last recorded block (%lu), retrying with the last block of the device (%lu).\n",
1167                           (unsigned long)sbi->s_last_block,
1168                           (unsigned long)blocks - 1);
1169                 udf_find_vat_block(sb, p_index, type1_index, blocks - 1);
1170         }
1171         if (!sbi->s_vat_inode)
1172                 return 1;
1173
1174         if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1175                 map->s_type_specific.s_virtual.s_start_offset = 0;
1176                 map->s_type_specific.s_virtual.s_num_entries =
1177                         (sbi->s_vat_inode->i_size - 36) >> 2;
1178         } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1179                 vati = UDF_I(sbi->s_vat_inode);
1180                 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1181                         pos = udf_block_map(sbi->s_vat_inode, 0);
1182                         bh = sb_bread(sb, pos);
1183                         if (!bh)
1184                                 return 1;
1185                         vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1186                 } else {
1187                         vat20 = (struct virtualAllocationTable20 *)
1188                                                         vati->i_ext.i_data;
1189                 }
1190
1191                 map->s_type_specific.s_virtual.s_start_offset =
1192                         le16_to_cpu(vat20->lengthHeader);
1193                 map->s_type_specific.s_virtual.s_num_entries =
1194                         (sbi->s_vat_inode->i_size -
1195                                 map->s_type_specific.s_virtual.
1196                                         s_start_offset) >> 2;
1197                 brelse(bh);
1198         }
1199         return 0;
1200 }
1201
1202 static int udf_load_partdesc(struct super_block *sb, sector_t block)
1203 {
1204         struct buffer_head *bh;
1205         struct partitionDesc *p;
1206         struct udf_part_map *map;
1207         struct udf_sb_info *sbi = UDF_SB(sb);
1208         int i, type1_idx;
1209         uint16_t partitionNumber;
1210         uint16_t ident;
1211         int ret = 0;
1212
1213         bh = udf_read_tagged(sb, block, block, &ident);
1214         if (!bh)
1215                 return 1;
1216         if (ident != TAG_IDENT_PD)
1217                 goto out_bh;
1218
1219         p = (struct partitionDesc *)bh->b_data;
1220         partitionNumber = le16_to_cpu(p->partitionNumber);
1221
1222         /* First scan for TYPE1, SPARABLE and METADATA partitions */
1223         for (i = 0; i < sbi->s_partitions; i++) {
1224                 map = &sbi->s_partmaps[i];
1225                 udf_debug("Searching map: (%d == %d)\n",
1226                           map->s_partition_num, partitionNumber);
1227                 if (map->s_partition_num == partitionNumber &&
1228                     (map->s_partition_type == UDF_TYPE1_MAP15 ||
1229                      map->s_partition_type == UDF_SPARABLE_MAP15))
1230                         break;
1231         }
1232
1233         if (i >= sbi->s_partitions) {
1234                 udf_debug("Partition (%d) not found in partition map\n",
1235                           partitionNumber);
1236                 goto out_bh;
1237         }
1238
1239         ret = udf_fill_partdesc_info(sb, p, i);
1240
1241         /*
1242          * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1243          * PHYSICAL partitions are already set up
1244          */
1245         type1_idx = i;
1246         for (i = 0; i < sbi->s_partitions; i++) {
1247                 map = &sbi->s_partmaps[i];
1248
1249                 if (map->s_partition_num == partitionNumber &&
1250                     (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1251                      map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1252                      map->s_partition_type == UDF_METADATA_MAP25))
1253                         break;
1254         }
1255
1256         if (i >= sbi->s_partitions)
1257                 goto out_bh;
1258
1259         ret = udf_fill_partdesc_info(sb, p, i);
1260         if (ret)
1261                 goto out_bh;
1262
1263         if (map->s_partition_type == UDF_METADATA_MAP25) {
1264                 ret = udf_load_metadata_files(sb, i);
1265                 if (ret) {
1266                         udf_err(sb, "error loading MetaData partition map %d\n",
1267                                 i);
1268                         goto out_bh;
1269                 }
1270         } else {
1271                 ret = udf_load_vat(sb, i, type1_idx);
1272                 if (ret)
1273                         goto out_bh;
1274                 /*
1275                  * Mark filesystem read-only if we have a partition with
1276                  * virtual map since we don't handle writing to it (we
1277                  * overwrite blocks instead of relocating them).
1278                  */
1279                 sb->s_flags |= MS_RDONLY;
1280                 pr_notice("Filesystem marked read-only because writing to pseudooverwrite partition is not implemented\n");
1281         }
1282 out_bh:
1283         /* In case loading failed, we handle cleanup in udf_fill_super */
1284         brelse(bh);
1285         return ret;
1286 }
1287
1288 static int udf_load_sparable_map(struct super_block *sb,
1289                                  struct udf_part_map *map,
1290                                  struct sparablePartitionMap *spm)
1291 {
1292         uint32_t loc;
1293         uint16_t ident;
1294         struct sparingTable *st;
1295         struct udf_sparing_data *sdata = &map->s_type_specific.s_sparing;
1296         int i;
1297         struct buffer_head *bh;
1298
1299         map->s_partition_type = UDF_SPARABLE_MAP15;
1300         sdata->s_packet_len = le16_to_cpu(spm->packetLength);
1301         if (!is_power_of_2(sdata->s_packet_len)) {
1302                 udf_err(sb, "error loading logical volume descriptor: "
1303                         "Invalid packet length %u\n",
1304                         (unsigned)sdata->s_packet_len);
1305                 return -EIO;
1306         }
1307         if (spm->numSparingTables > 4) {
1308                 udf_err(sb, "error loading logical volume descriptor: "
1309                         "Too many sparing tables (%d)\n",
1310                         (int)spm->numSparingTables);
1311                 return -EIO;
1312         }
1313
1314         for (i = 0; i < spm->numSparingTables; i++) {
1315                 loc = le32_to_cpu(spm->locSparingTable[i]);
1316                 bh = udf_read_tagged(sb, loc, loc, &ident);
1317                 if (!bh)
1318                         continue;
1319
1320                 st = (struct sparingTable *)bh->b_data;
1321                 if (ident != 0 ||
1322                     strncmp(st->sparingIdent.ident, UDF_ID_SPARING,
1323                             strlen(UDF_ID_SPARING)) ||
1324                     sizeof(*st) + le16_to_cpu(st->reallocationTableLen) >
1325                                                         sb->s_blocksize) {
1326                         brelse(bh);
1327                         continue;
1328                 }
1329
1330                 sdata->s_spar_map[i] = bh;
1331         }
1332         map->s_partition_func = udf_get_pblock_spar15;
1333         return 0;
1334 }
1335
1336 static int udf_load_logicalvol(struct super_block *sb, sector_t block,
1337                                struct kernel_lb_addr *fileset)
1338 {
1339         struct logicalVolDesc *lvd;
1340         int i, offset;
1341         uint8_t type;
1342         struct udf_sb_info *sbi = UDF_SB(sb);
1343         struct genericPartitionMap *gpm;
1344         uint16_t ident;
1345         struct buffer_head *bh;
1346         unsigned int table_len;
1347         int ret = 0;
1348
1349         bh = udf_read_tagged(sb, block, block, &ident);
1350         if (!bh)
1351                 return 1;
1352         BUG_ON(ident != TAG_IDENT_LVD);
1353         lvd = (struct logicalVolDesc *)bh->b_data;
1354         table_len = le32_to_cpu(lvd->mapTableLength);
1355         if (table_len > sb->s_blocksize - sizeof(*lvd)) {
1356                 udf_err(sb, "error loading logical volume descriptor: "
1357                         "Partition table too long (%u > %lu)\n", table_len,
1358                         sb->s_blocksize - sizeof(*lvd));
1359                 ret = 1;
1360                 goto out_bh;
1361         }
1362
1363         ret = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1364         if (ret)
1365                 goto out_bh;
1366
1367         for (i = 0, offset = 0;
1368              i < sbi->s_partitions && offset < table_len;
1369              i++, offset += gpm->partitionMapLength) {
1370                 struct udf_part_map *map = &sbi->s_partmaps[i];
1371                 gpm = (struct genericPartitionMap *)
1372                                 &(lvd->partitionMaps[offset]);
1373                 type = gpm->partitionMapType;
1374                 if (type == 1) {
1375                         struct genericPartitionMap1 *gpm1 =
1376                                 (struct genericPartitionMap1 *)gpm;
1377                         map->s_partition_type = UDF_TYPE1_MAP15;
1378                         map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1379                         map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1380                         map->s_partition_func = NULL;
1381                 } else if (type == 2) {
1382                         struct udfPartitionMap2 *upm2 =
1383                                                 (struct udfPartitionMap2 *)gpm;
1384                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1385                                                 strlen(UDF_ID_VIRTUAL))) {
1386                                 u16 suf =
1387                                         le16_to_cpu(((__le16 *)upm2->partIdent.
1388                                                         identSuffix)[0]);
1389                                 if (suf < 0x0200) {
1390                                         map->s_partition_type =
1391                                                         UDF_VIRTUAL_MAP15;
1392                                         map->s_partition_func =
1393                                                         udf_get_pblock_virt15;
1394                                 } else {
1395                                         map->s_partition_type =
1396                                                         UDF_VIRTUAL_MAP20;
1397                                         map->s_partition_func =
1398                                                         udf_get_pblock_virt20;
1399                                 }
1400                         } else if (!strncmp(upm2->partIdent.ident,
1401                                                 UDF_ID_SPARABLE,
1402                                                 strlen(UDF_ID_SPARABLE))) {
1403                                 if (udf_load_sparable_map(sb, map,
1404                                     (struct sparablePartitionMap *)gpm) < 0) {
1405                                         ret = 1;
1406                                         goto out_bh;
1407                                 }
1408                         } else if (!strncmp(upm2->partIdent.ident,
1409                                                 UDF_ID_METADATA,
1410                                                 strlen(UDF_ID_METADATA))) {
1411                                 struct udf_meta_data *mdata =
1412                                         &map->s_type_specific.s_metadata;
1413                                 struct metadataPartitionMap *mdm =
1414                                                 (struct metadataPartitionMap *)
1415                                                 &(lvd->partitionMaps[offset]);
1416                                 udf_debug("Parsing Logical vol part %d type %d  id=%s\n",
1417                                           i, type, UDF_ID_METADATA);
1418
1419                                 map->s_partition_type = UDF_METADATA_MAP25;
1420                                 map->s_partition_func = udf_get_pblock_meta25;
1421
1422                                 mdata->s_meta_file_loc   =
1423                                         le32_to_cpu(mdm->metadataFileLoc);
1424                                 mdata->s_mirror_file_loc =
1425                                         le32_to_cpu(mdm->metadataMirrorFileLoc);
1426                                 mdata->s_bitmap_file_loc =
1427                                         le32_to_cpu(mdm->metadataBitmapFileLoc);
1428                                 mdata->s_alloc_unit_size =
1429                                         le32_to_cpu(mdm->allocUnitSize);
1430                                 mdata->s_align_unit_size =
1431                                         le16_to_cpu(mdm->alignUnitSize);
1432                                 if (mdm->flags & 0x01)
1433                                         mdata->s_flags |= MF_DUPLICATE_MD;
1434
1435                                 udf_debug("Metadata Ident suffix=0x%x\n",
1436                                           le16_to_cpu(*(__le16 *)
1437                                                       mdm->partIdent.identSuffix));
1438                                 udf_debug("Metadata part num=%d\n",
1439                                           le16_to_cpu(mdm->partitionNum));
1440                                 udf_debug("Metadata part alloc unit size=%d\n",
1441                                           le32_to_cpu(mdm->allocUnitSize));
1442                                 udf_debug("Metadata file loc=%d\n",
1443                                           le32_to_cpu(mdm->metadataFileLoc));
1444                                 udf_debug("Mirror file loc=%d\n",
1445                                           le32_to_cpu(mdm->metadataMirrorFileLoc));
1446                                 udf_debug("Bitmap file loc=%d\n",
1447                                           le32_to_cpu(mdm->metadataBitmapFileLoc));
1448                                 udf_debug("Flags: %d %d\n",
1449                                           mdata->s_flags, mdm->flags);
1450                         } else {
1451                                 udf_debug("Unknown ident: %s\n",
1452                                           upm2->partIdent.ident);
1453                                 continue;
1454                         }
1455                         map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1456                         map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1457                 }
1458                 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1459                           i, map->s_partition_num, type, map->s_volumeseqnum);
1460         }
1461
1462         if (fileset) {
1463                 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
1464
1465                 *fileset = lelb_to_cpu(la->extLocation);
1466                 udf_debug("FileSet found in LogicalVolDesc at block=%d, partition=%d\n",
1467                           fileset->logicalBlockNum,
1468                           fileset->partitionReferenceNum);
1469         }
1470         if (lvd->integritySeqExt.extLength)
1471                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1472
1473 out_bh:
1474         brelse(bh);
1475         return ret;
1476 }
1477
1478 /*
1479  * udf_load_logicalvolint
1480  *
1481  */
1482 static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
1483 {
1484         struct buffer_head *bh = NULL;
1485         uint16_t ident;
1486         struct udf_sb_info *sbi = UDF_SB(sb);
1487         struct logicalVolIntegrityDesc *lvid;
1488
1489         while (loc.extLength > 0 &&
1490                (bh = udf_read_tagged(sb, loc.extLocation,
1491                                      loc.extLocation, &ident)) &&
1492                ident == TAG_IDENT_LVID) {
1493                 sbi->s_lvid_bh = bh;
1494                 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1495
1496                 if (lvid->nextIntegrityExt.extLength)
1497                         udf_load_logicalvolint(sb,
1498                                 leea_to_cpu(lvid->nextIntegrityExt));
1499
1500                 if (sbi->s_lvid_bh != bh)
1501                         brelse(bh);
1502                 loc.extLength -= sb->s_blocksize;
1503                 loc.extLocation++;
1504         }
1505         if (sbi->s_lvid_bh != bh)
1506                 brelse(bh);
1507 }
1508
1509 /*
1510  * udf_process_sequence
1511  *
1512  * PURPOSE
1513  *      Process a main/reserve volume descriptor sequence.
1514  *
1515  * PRE-CONDITIONS
1516  *      sb                      Pointer to _locked_ superblock.
1517  *      block                   First block of first extent of the sequence.
1518  *      lastblock               Lastblock of first extent of the sequence.
1519  *
1520  * HISTORY
1521  *      July 1, 1997 - Andrew E. Mileski
1522  *      Written, tested, and released.
1523  */
1524 static noinline int udf_process_sequence(struct super_block *sb, long block,
1525                                 long lastblock, struct kernel_lb_addr *fileset)
1526 {
1527         struct buffer_head *bh = NULL;
1528         struct udf_vds_record vds[VDS_POS_LENGTH];
1529         struct udf_vds_record *curr;
1530         struct generic_desc *gd;
1531         struct volDescPtr *vdp;
1532         int done = 0;
1533         uint32_t vdsn;
1534         uint16_t ident;
1535         long next_s = 0, next_e = 0;
1536
1537         memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1538
1539         /*
1540          * Read the main descriptor sequence and find which descriptors
1541          * are in it.
1542          */
1543         for (; (!done && block <= lastblock); block++) {
1544
1545                 bh = udf_read_tagged(sb, block, block, &ident);
1546                 if (!bh) {
1547                         udf_err(sb,
1548                                 "Block %llu of volume descriptor sequence is corrupted or we could not read it\n",
1549                                 (unsigned long long)block);
1550                         return 1;
1551                 }
1552
1553                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1554                 gd = (struct generic_desc *)bh->b_data;
1555                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1556                 switch (ident) {
1557                 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1558                         curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1559                         if (vdsn >= curr->volDescSeqNum) {
1560                                 curr->volDescSeqNum = vdsn;
1561                                 curr->block = block;
1562                         }
1563                         break;
1564                 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1565                         curr = &vds[VDS_POS_VOL_DESC_PTR];
1566                         if (vdsn >= curr->volDescSeqNum) {
1567                                 curr->volDescSeqNum = vdsn;
1568                                 curr->block = block;
1569
1570                                 vdp = (struct volDescPtr *)bh->b_data;
1571                                 next_s = le32_to_cpu(
1572                                         vdp->nextVolDescSeqExt.extLocation);
1573                                 next_e = le32_to_cpu(
1574                                         vdp->nextVolDescSeqExt.extLength);
1575                                 next_e = next_e >> sb->s_blocksize_bits;
1576                                 next_e += next_s;
1577                         }
1578                         break;
1579                 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1580                         curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1581                         if (vdsn >= curr->volDescSeqNum) {
1582                                 curr->volDescSeqNum = vdsn;
1583                                 curr->block = block;
1584                         }
1585                         break;
1586                 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1587                         curr = &vds[VDS_POS_PARTITION_DESC];
1588                         if (!curr->block)
1589                                 curr->block = block;
1590                         break;
1591                 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1592                         curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1593                         if (vdsn >= curr->volDescSeqNum) {
1594                                 curr->volDescSeqNum = vdsn;
1595                                 curr->block = block;
1596                         }
1597                         break;
1598                 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1599                         curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1600                         if (vdsn >= curr->volDescSeqNum) {
1601                                 curr->volDescSeqNum = vdsn;
1602                                 curr->block = block;
1603                         }
1604                         break;
1605                 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1606                         vds[VDS_POS_TERMINATING_DESC].block = block;
1607                         if (next_e) {
1608                                 block = next_s;
1609                                 lastblock = next_e;
1610                                 next_s = next_e = 0;
1611                         } else
1612                                 done = 1;
1613                         break;
1614                 }
1615                 brelse(bh);
1616         }
1617         /*
1618          * Now read interesting descriptors again and process them
1619          * in a suitable order
1620          */
1621         if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1622                 udf_err(sb, "Primary Volume Descriptor not found!\n");
1623                 return 1;
1624         }
1625         if (udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block))
1626                 return 1;
1627
1628         if (vds[VDS_POS_LOGICAL_VOL_DESC].block && udf_load_logicalvol(sb,
1629             vds[VDS_POS_LOGICAL_VOL_DESC].block, fileset))
1630                 return 1;
1631
1632         if (vds[VDS_POS_PARTITION_DESC].block) {
1633                 /*
1634                  * We rescan the whole descriptor sequence to find
1635                  * partition descriptor blocks and process them.
1636                  */
1637                 for (block = vds[VDS_POS_PARTITION_DESC].block;
1638                      block < vds[VDS_POS_TERMINATING_DESC].block;
1639                      block++)
1640                         if (udf_load_partdesc(sb, block))
1641                                 return 1;
1642         }
1643
1644         return 0;
1645 }
1646
1647 static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh,
1648                              struct kernel_lb_addr *fileset)
1649 {
1650         struct anchorVolDescPtr *anchor;
1651         long main_s, main_e, reserve_s, reserve_e;
1652
1653         anchor = (struct anchorVolDescPtr *)bh->b_data;
1654
1655         /* Locate the main sequence */
1656         main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1657         main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1658         main_e = main_e >> sb->s_blocksize_bits;
1659         main_e += main_s;
1660
1661         /* Locate the reserve sequence */
1662         reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1663         reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1664         reserve_e = reserve_e >> sb->s_blocksize_bits;
1665         reserve_e += reserve_s;
1666
1667         /* Process the main & reserve sequences */
1668         /* responsible for finding the PartitionDesc(s) */
1669         if (!udf_process_sequence(sb, main_s, main_e, fileset))
1670                 return 1;
1671         udf_sb_free_partitions(sb);
1672         if (!udf_process_sequence(sb, reserve_s, reserve_e, fileset))
1673                 return 1;
1674         udf_sb_free_partitions(sb);
1675         return 0;
1676 }
1677
1678 /*
1679  * Check whether there is an anchor block in the given block and
1680  * load Volume Descriptor Sequence if so.
1681  */
1682 static int udf_check_anchor_block(struct super_block *sb, sector_t block,
1683                                   struct kernel_lb_addr *fileset)
1684 {
1685         struct buffer_head *bh;
1686         uint16_t ident;
1687         int ret;
1688
1689         if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
1690             udf_fixed_to_variable(block) >=
1691             sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits)
1692                 return 0;
1693
1694         bh = udf_read_tagged(sb, block, block, &ident);
1695         if (!bh)
1696                 return 0;
1697         if (ident != TAG_IDENT_AVDP) {
1698                 brelse(bh);
1699                 return 0;
1700         }
1701         ret = udf_load_sequence(sb, bh, fileset);
1702         brelse(bh);
1703         return ret;
1704 }
1705
1706 /* Search for an anchor volume descriptor pointer */
1707 static sector_t udf_scan_anchors(struct super_block *sb, sector_t lastblock,
1708                                  struct kernel_lb_addr *fileset)
1709 {
1710         sector_t last[6];
1711         int i;
1712         struct udf_sb_info *sbi = UDF_SB(sb);
1713         int last_count = 0;
1714
1715         /* First try user provided anchor */
1716         if (sbi->s_anchor) {
1717                 if (udf_check_anchor_block(sb, sbi->s_anchor, fileset))
1718                         return lastblock;
1719         }
1720         /*
1721          * according to spec, anchor is in either:
1722          *     block 256
1723          *     lastblock-256
1724          *     lastblock
1725          *  however, if the disc isn't closed, it could be 512.
1726          */
1727         if (udf_check_anchor_block(sb, sbi->s_session + 256, fileset))
1728                 return lastblock;
1729         /*
1730          * The trouble is which block is the last one. Drives often misreport
1731          * this so we try various possibilities.
1732          */
1733         last[last_count++] = lastblock;
1734         if (lastblock >= 1)
1735                 last[last_count++] = lastblock - 1;
1736         last[last_count++] = lastblock + 1;
1737         if (lastblock >= 2)
1738                 last[last_count++] = lastblock - 2;
1739         if (lastblock >= 150)
1740                 last[last_count++] = lastblock - 150;
1741         if (lastblock >= 152)
1742                 last[last_count++] = lastblock - 152;
1743
1744         for (i = 0; i < last_count; i++) {
1745                 if (last[i] >= sb->s_bdev->bd_inode->i_size >>
1746                                 sb->s_blocksize_bits)
1747                         continue;
1748                 if (udf_check_anchor_block(sb, last[i], fileset))
1749                         return last[i];
1750                 if (last[i] < 256)
1751                         continue;
1752                 if (udf_check_anchor_block(sb, last[i] - 256, fileset))
1753                         return last[i];
1754         }
1755
1756         /* Finally try block 512 in case media is open */
1757         if (udf_check_anchor_block(sb, sbi->s_session + 512, fileset))
1758                 return last[0];
1759         return 0;
1760 }
1761
1762 /*
1763  * Find an anchor volume descriptor and load Volume Descriptor Sequence from
1764  * area specified by it. The function expects sbi->s_lastblock to be the last
1765  * block on the media.
1766  *
1767  * Return 1 if ok, 0 if not found.
1768  *
1769  */
1770 static int udf_find_anchor(struct super_block *sb,
1771                            struct kernel_lb_addr *fileset)
1772 {
1773         sector_t lastblock;
1774         struct udf_sb_info *sbi = UDF_SB(sb);
1775
1776         lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1777         if (lastblock)
1778                 goto out;
1779
1780         /* No anchor found? Try VARCONV conversion of block numbers */
1781         UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
1782         /* Firstly, we try to not convert number of the last block */
1783         lastblock = udf_scan_anchors(sb,
1784                                 udf_variable_to_fixed(sbi->s_last_block),
1785                                 fileset);
1786         if (lastblock)
1787                 goto out;
1788
1789         /* Secondly, we try with converted number of the last block */
1790         lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1791         if (!lastblock) {
1792                 /* VARCONV didn't help. Clear it. */
1793                 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
1794                 return 0;
1795         }
1796 out:
1797         sbi->s_last_block = lastblock;
1798         return 1;
1799 }
1800
1801 /*
1802  * Check Volume Structure Descriptor, find Anchor block and load Volume
1803  * Descriptor Sequence
1804  */
1805 static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
1806                         int silent, struct kernel_lb_addr *fileset)
1807 {
1808         struct udf_sb_info *sbi = UDF_SB(sb);
1809         loff_t nsr_off;
1810
1811         if (!sb_set_blocksize(sb, uopt->blocksize)) {
1812                 if (!silent)
1813                         udf_warn(sb, "Bad block size\n");
1814                 return 0;
1815         }
1816         sbi->s_last_block = uopt->lastblock;
1817         if (!uopt->novrs) {
1818                 /* Check that it is NSR02 compliant */
1819                 nsr_off = udf_check_vsd(sb);
1820                 if (!nsr_off) {
1821                         if (!silent)
1822                                 udf_warn(sb, "No VRS found\n");
1823                         return 0;
1824                 }
1825                 if (nsr_off == -1)
1826                         udf_debug("Failed to read byte 32768. Assuming open disc. Skipping validity check\n");
1827                 if (!sbi->s_last_block)
1828                         sbi->s_last_block = udf_get_last_block(sb);
1829         } else {
1830                 udf_debug("Validity check skipped because of novrs option\n");
1831         }
1832
1833         /* Look for anchor block and load Volume Descriptor Sequence */
1834         sbi->s_anchor = uopt->anchor;
1835         if (!udf_find_anchor(sb, fileset)) {
1836                 if (!silent)
1837                         udf_warn(sb, "No anchor found\n");
1838                 return 0;
1839         }
1840         return 1;
1841 }
1842
1843 static void udf_open_lvid(struct super_block *sb)
1844 {
1845         struct udf_sb_info *sbi = UDF_SB(sb);
1846         struct buffer_head *bh = sbi->s_lvid_bh;
1847         struct logicalVolIntegrityDesc *lvid;
1848         struct logicalVolIntegrityDescImpUse *lvidiu;
1849
1850         if (!bh)
1851                 return;
1852
1853         mutex_lock(&sbi->s_alloc_mutex);
1854         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1855         lvidiu = udf_sb_lvidiu(sbi);
1856
1857         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1858         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1859         udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
1860                                 CURRENT_TIME);
1861         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN);
1862
1863         lvid->descTag.descCRC = cpu_to_le16(
1864                 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1865                         le16_to_cpu(lvid->descTag.descCRCLength)));
1866
1867         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1868         mark_buffer_dirty(bh);
1869         sbi->s_lvid_dirty = 0;
1870         mutex_unlock(&sbi->s_alloc_mutex);
1871         /* Make opening of filesystem visible on the media immediately */
1872         sync_dirty_buffer(bh);
1873 }
1874
1875 static void udf_close_lvid(struct super_block *sb)
1876 {
1877         struct udf_sb_info *sbi = UDF_SB(sb);
1878         struct buffer_head *bh = sbi->s_lvid_bh;
1879         struct logicalVolIntegrityDesc *lvid;
1880         struct logicalVolIntegrityDescImpUse *lvidiu;
1881
1882         if (!bh)
1883                 return;
1884
1885         mutex_lock(&sbi->s_alloc_mutex);
1886         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1887         lvidiu = udf_sb_lvidiu(sbi);
1888         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1889         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1890         udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
1891         if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1892                 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1893         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1894                 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1895         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
1896                 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
1897         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1898
1899         lvid->descTag.descCRC = cpu_to_le16(
1900                         crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1901                                 le16_to_cpu(lvid->descTag.descCRCLength)));
1902
1903         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1904         /*
1905          * We set buffer uptodate unconditionally here to avoid spurious
1906          * warnings from mark_buffer_dirty() when previous EIO has marked
1907          * the buffer as !uptodate
1908          */
1909         set_buffer_uptodate(bh);
1910         mark_buffer_dirty(bh);
1911         sbi->s_lvid_dirty = 0;
1912         mutex_unlock(&sbi->s_alloc_mutex);
1913         /* Make closing of filesystem visible on the media immediately */
1914         sync_dirty_buffer(bh);
1915 }
1916
1917 u64 lvid_get_unique_id(struct super_block *sb)
1918 {
1919         struct buffer_head *bh;
1920         struct udf_sb_info *sbi = UDF_SB(sb);
1921         struct logicalVolIntegrityDesc *lvid;
1922         struct logicalVolHeaderDesc *lvhd;
1923         u64 uniqueID;
1924         u64 ret;
1925
1926         bh = sbi->s_lvid_bh;
1927         if (!bh)
1928                 return 0;
1929
1930         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1931         lvhd = (struct logicalVolHeaderDesc *)lvid->logicalVolContentsUse;
1932
1933         mutex_lock(&sbi->s_alloc_mutex);
1934         ret = uniqueID = le64_to_cpu(lvhd->uniqueID);
1935         if (!(++uniqueID & 0xFFFFFFFF))
1936                 uniqueID += 16;
1937         lvhd->uniqueID = cpu_to_le64(uniqueID);
1938         mutex_unlock(&sbi->s_alloc_mutex);
1939         mark_buffer_dirty(bh);
1940
1941         return ret;
1942 }
1943
1944 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1945 {
1946         int ret;
1947         struct inode *inode = NULL;
1948         struct udf_options uopt;
1949         struct kernel_lb_addr rootdir, fileset;
1950         struct udf_sb_info *sbi;
1951
1952         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1953         uopt.uid = INVALID_UID;
1954         uopt.gid = INVALID_GID;
1955         uopt.umask = 0;
1956         uopt.fmode = UDF_INVALID_MODE;
1957         uopt.dmode = UDF_INVALID_MODE;
1958
1959         sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1960         if (!sbi)
1961                 return -ENOMEM;
1962
1963         sb->s_fs_info = sbi;
1964
1965         mutex_init(&sbi->s_alloc_mutex);
1966
1967         if (!udf_parse_options((char *)options, &uopt, false))
1968                 goto error_out;
1969
1970         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1971             uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
1972                 udf_err(sb, "utf8 cannot be combined with iocharset\n");
1973                 goto error_out;
1974         }
1975 #ifdef CONFIG_UDF_NLS
1976         if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1977                 uopt.nls_map = load_nls_default();
1978                 if (!uopt.nls_map)
1979                         uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1980                 else
1981                         udf_debug("Using default NLS map\n");
1982         }
1983 #endif
1984         if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1985                 uopt.flags |= (1 << UDF_FLAG_UTF8);
1986
1987         fileset.logicalBlockNum = 0xFFFFFFFF;
1988         fileset.partitionReferenceNum = 0xFFFF;
1989
1990         sbi->s_flags = uopt.flags;
1991         sbi->s_uid = uopt.uid;
1992         sbi->s_gid = uopt.gid;
1993         sbi->s_umask = uopt.umask;
1994         sbi->s_fmode = uopt.fmode;
1995         sbi->s_dmode = uopt.dmode;
1996         sbi->s_nls_map = uopt.nls_map;
1997         rwlock_init(&sbi->s_cred_lock);
1998
1999         if (uopt.session == 0xFFFFFFFF)
2000                 sbi->s_session = udf_get_last_session(sb);
2001         else
2002                 sbi->s_session = uopt.session;
2003
2004         udf_debug("Multi-session=%d\n", sbi->s_session);
2005
2006         /* Fill in the rest of the superblock */
2007         sb->s_op = &udf_sb_ops;
2008         sb->s_export_op = &udf_export_ops;
2009
2010         sb->s_magic = UDF_SUPER_MAGIC;
2011         sb->s_time_gran = 1000;
2012
2013         if (uopt.flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) {
2014                 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
2015         } else {
2016                 uopt.blocksize = bdev_logical_block_size(sb->s_bdev);
2017                 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
2018                 if (!ret && uopt.blocksize != UDF_DEFAULT_BLOCKSIZE) {
2019                         if (!silent)
2020                                 pr_notice("Rescanning with blocksize %d\n",
2021                                           UDF_DEFAULT_BLOCKSIZE);
2022                         brelse(sbi->s_lvid_bh);
2023                         sbi->s_lvid_bh = NULL;
2024                         uopt.blocksize = UDF_DEFAULT_BLOCKSIZE;
2025                         ret = udf_load_vrs(sb, &uopt, silent, &fileset);
2026                 }
2027         }
2028         if (!ret) {
2029                 udf_warn(sb, "No partition found (1)\n");
2030                 goto error_out;
2031         }
2032
2033         udf_debug("Lastblock=%d\n", sbi->s_last_block);
2034
2035         if (sbi->s_lvid_bh) {
2036                 struct logicalVolIntegrityDescImpUse *lvidiu =
2037                                                         udf_sb_lvidiu(sbi);
2038                 uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
2039                 uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
2040                 /* uint16_t maxUDFWriteRev =
2041                                 le16_to_cpu(lvidiu->maxUDFWriteRev); */
2042
2043                 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
2044                         udf_err(sb, "minUDFReadRev=%x (max is %x)\n",
2045                                 le16_to_cpu(lvidiu->minUDFReadRev),
2046                                 UDF_MAX_READ_VERSION);
2047                         goto error_out;
2048                 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
2049                         sb->s_flags |= MS_RDONLY;
2050
2051                 sbi->s_udfrev = minUDFWriteRev;
2052
2053                 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
2054                         UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
2055                 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
2056                         UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
2057         }
2058
2059         if (!sbi->s_partitions) {
2060                 udf_warn(sb, "No partition found (2)\n");
2061                 goto error_out;
2062         }
2063
2064         if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
2065                         UDF_PART_FLAG_READ_ONLY) {
2066                 pr_notice("Partition marked readonly; forcing readonly mount\n");
2067                 sb->s_flags |= MS_RDONLY;
2068         }
2069
2070         if (udf_find_fileset(sb, &fileset, &rootdir)) {
2071                 udf_warn(sb, "No fileset found\n");
2072                 goto error_out;
2073         }
2074
2075         if (!silent) {
2076                 struct timestamp ts;
2077                 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
2078                 udf_info("Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
2079                          sbi->s_volume_ident,
2080                          le16_to_cpu(ts.year), ts.month, ts.day,
2081                          ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
2082         }
2083         if (!(sb->s_flags & MS_RDONLY))
2084                 udf_open_lvid(sb);
2085
2086         /* Assign the root inode */
2087         /* assign inodes by physical block number */
2088         /* perhaps it's not extensible enough, but for now ... */
2089         inode = udf_iget(sb, &rootdir);
2090         if (!inode) {
2091                 udf_err(sb, "Error in udf_iget, block=%d, partition=%d\n",
2092                        rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
2093                 goto error_out;
2094         }
2095
2096         /* Allocate a dentry for the root inode */
2097         sb->s_root = d_make_root(inode);
2098         if (!sb->s_root) {
2099                 udf_err(sb, "Couldn't allocate root dentry\n");
2100                 goto error_out;
2101         }
2102         sb->s_maxbytes = MAX_LFS_FILESIZE;
2103         sb->s_max_links = UDF_MAX_LINKS;
2104         return 0;
2105
2106 error_out:
2107         if (sbi->s_vat_inode)
2108                 iput(sbi->s_vat_inode);
2109 #ifdef CONFIG_UDF_NLS
2110         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2111                 unload_nls(sbi->s_nls_map);
2112 #endif
2113         if (!(sb->s_flags & MS_RDONLY))
2114                 udf_close_lvid(sb);
2115         brelse(sbi->s_lvid_bh);
2116         udf_sb_free_partitions(sb);
2117         kfree(sbi);
2118         sb->s_fs_info = NULL;
2119
2120         return -EINVAL;
2121 }
2122
2123 void _udf_err(struct super_block *sb, const char *function,
2124               const char *fmt, ...)
2125 {
2126         struct va_format vaf;
2127         va_list args;
2128
2129         va_start(args, fmt);
2130
2131         vaf.fmt = fmt;
2132         vaf.va = &args;
2133
2134         pr_err("error (device %s): %s: %pV", sb->s_id, function, &vaf);
2135
2136         va_end(args);
2137 }
2138
2139 void _udf_warn(struct super_block *sb, const char *function,
2140                const char *fmt, ...)
2141 {
2142         struct va_format vaf;
2143         va_list args;
2144
2145         va_start(args, fmt);
2146
2147         vaf.fmt = fmt;
2148         vaf.va = &args;
2149
2150         pr_warn("warning (device %s): %s: %pV", sb->s_id, function, &vaf);
2151
2152         va_end(args);
2153 }
2154
2155 static void udf_put_super(struct super_block *sb)
2156 {
2157         struct udf_sb_info *sbi;
2158
2159         sbi = UDF_SB(sb);
2160
2161         if (sbi->s_vat_inode)
2162                 iput(sbi->s_vat_inode);
2163 #ifdef CONFIG_UDF_NLS
2164         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2165                 unload_nls(sbi->s_nls_map);
2166 #endif
2167         if (!(sb->s_flags & MS_RDONLY))
2168                 udf_close_lvid(sb);
2169         brelse(sbi->s_lvid_bh);
2170         udf_sb_free_partitions(sb);
2171         kfree(sb->s_fs_info);
2172         sb->s_fs_info = NULL;
2173 }
2174
2175 static int udf_sync_fs(struct super_block *sb, int wait)
2176 {
2177         struct udf_sb_info *sbi = UDF_SB(sb);
2178
2179         mutex_lock(&sbi->s_alloc_mutex);
2180         if (sbi->s_lvid_dirty) {
2181                 /*
2182                  * Blockdevice will be synced later so we don't have to submit
2183                  * the buffer for IO
2184                  */
2185                 mark_buffer_dirty(sbi->s_lvid_bh);
2186                 sbi->s_lvid_dirty = 0;
2187         }
2188         mutex_unlock(&sbi->s_alloc_mutex);
2189
2190         return 0;
2191 }
2192
2193 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
2194 {
2195         struct super_block *sb = dentry->d_sb;
2196         struct udf_sb_info *sbi = UDF_SB(sb);
2197         struct logicalVolIntegrityDescImpUse *lvidiu;
2198         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
2199
2200         if (sbi->s_lvid_bh != NULL)
2201                 lvidiu = udf_sb_lvidiu(sbi);
2202         else
2203                 lvidiu = NULL;
2204
2205         buf->f_type = UDF_SUPER_MAGIC;
2206         buf->f_bsize = sb->s_blocksize;
2207         buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
2208         buf->f_bfree = udf_count_free(sb);
2209         buf->f_bavail = buf->f_bfree;
2210         buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2211                                           le32_to_cpu(lvidiu->numDirs)) : 0)
2212                         + buf->f_bfree;
2213         buf->f_ffree = buf->f_bfree;
2214         buf->f_namelen = UDF_NAME_LEN - 2;
2215         buf->f_fsid.val[0] = (u32)id;
2216         buf->f_fsid.val[1] = (u32)(id >> 32);
2217
2218         return 0;
2219 }
2220
2221 static unsigned int udf_count_free_bitmap(struct super_block *sb,
2222                                           struct udf_bitmap *bitmap)
2223 {
2224         struct buffer_head *bh = NULL;
2225         unsigned int accum = 0;
2226         int index;
2227         int block = 0, newblock;
2228         struct kernel_lb_addr loc;
2229         uint32_t bytes;
2230         uint8_t *ptr;
2231         uint16_t ident;
2232         struct spaceBitmapDesc *bm;
2233
2234         loc.logicalBlockNum = bitmap->s_extPosition;
2235         loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
2236         bh = udf_read_ptagged(sb, &loc, 0, &ident);
2237
2238         if (!bh) {
2239                 udf_err(sb, "udf_count_free failed\n");
2240                 goto out;
2241         } else if (ident != TAG_IDENT_SBD) {
2242                 brelse(bh);
2243                 udf_err(sb, "udf_count_free failed\n");
2244                 goto out;
2245         }
2246
2247         bm = (struct spaceBitmapDesc *)bh->b_data;
2248         bytes = le32_to_cpu(bm->numOfBytes);
2249         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2250         ptr = (uint8_t *)bh->b_data;
2251
2252         while (bytes > 0) {
2253                 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2254                 accum += bitmap_weight((const unsigned long *)(ptr + index),
2255                                         cur_bytes * 8);
2256                 bytes -= cur_bytes;
2257                 if (bytes) {
2258                         brelse(bh);
2259                         newblock = udf_get_lb_pblock(sb, &loc, ++block);
2260                         bh = udf_tread(sb, newblock);
2261                         if (!bh) {
2262                                 udf_debug("read failed\n");
2263                                 goto out;
2264                         }
2265                         index = 0;
2266                         ptr = (uint8_t *)bh->b_data;
2267                 }
2268         }
2269         brelse(bh);
2270 out:
2271         return accum;
2272 }
2273
2274 static unsigned int udf_count_free_table(struct super_block *sb,
2275                                          struct inode *table)
2276 {
2277         unsigned int accum = 0;
2278         uint32_t elen;
2279         struct kernel_lb_addr eloc;
2280         int8_t etype;
2281         struct extent_position epos;
2282
2283         mutex_lock(&UDF_SB(sb)->s_alloc_mutex);
2284         epos.block = UDF_I(table)->i_location;
2285         epos.offset = sizeof(struct unallocSpaceEntry);
2286         epos.bh = NULL;
2287
2288         while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2289                 accum += (elen >> table->i_sb->s_blocksize_bits);
2290
2291         brelse(epos.bh);
2292         mutex_unlock(&UDF_SB(sb)->s_alloc_mutex);
2293
2294         return accum;
2295 }
2296
2297 static unsigned int udf_count_free(struct super_block *sb)
2298 {
2299         unsigned int accum = 0;
2300         struct udf_sb_info *sbi;
2301         struct udf_part_map *map;
2302
2303         sbi = UDF_SB(sb);
2304         if (sbi->s_lvid_bh) {
2305                 struct logicalVolIntegrityDesc *lvid =
2306                         (struct logicalVolIntegrityDesc *)
2307                         sbi->s_lvid_bh->b_data;
2308                 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
2309                         accum = le32_to_cpu(
2310                                         lvid->freeSpaceTable[sbi->s_partition]);
2311                         if (accum == 0xFFFFFFFF)
2312                                 accum = 0;
2313                 }
2314         }
2315
2316         if (accum)
2317                 return accum;
2318
2319         map = &sbi->s_partmaps[sbi->s_partition];
2320         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2321                 accum += udf_count_free_bitmap(sb,
2322                                                map->s_uspace.s_bitmap);
2323         }
2324         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
2325                 accum += udf_count_free_bitmap(sb,
2326                                                map->s_fspace.s_bitmap);
2327         }
2328         if (accum)
2329                 return accum;
2330
2331         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2332                 accum += udf_count_free_table(sb,
2333                                               map->s_uspace.s_table);
2334         }
2335         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
2336                 accum += udf_count_free_table(sb,
2337                                               map->s_fspace.s_table);
2338         }
2339
2340         return accum;
2341 }