fs/udf/super.c

   1 /*
   2  * super.c
   3  *
   4  * PURPOSE
   5  *  Super block routines for the OSTA-UDF(tm) filesystem.
   6  *
   7  * DESCRIPTION
   8  *  OSTA-UDF(tm) = Optical Storage Technology Association
   9  *  Universal Disk Format.
  10  *
  11  *  This code is based on version 2.00 of the UDF specification,
  12  *  and revision 3 of the ECMA 167 standard [equivalent to ISO 13346].
  13  *    http://www.osta.org/
  14  *    http://www.ecma.ch/
  15  *    http://www.iso.org/
  16  *
  17  * COPYRIGHT
  18  *  This file is distributed under the terms of the GNU General Public
  19  *  License (GPL). Copies of the GPL can be obtained from:
  20  *    ftp://prep.ai.mit.edu/pub/gnu/GPL
  21  *  Each contributing author retains all rights to their own work.
  22  *
  23  *  (C) 1998 Dave Boynton
  24  *  (C) 1998-2004 Ben Fennema
  25  *  (C) 2000 Stelias Computing Inc
  26  *
  27  * HISTORY
  28  *
  29  *  09/24/98 dgb  changed to allow compiling outside of kernel, and
  30  *                added some debugging.
  31  *  10/01/98 dgb  updated to allow (some) possibility of compiling w/2.0.34
  32  *  10/16/98      attempting some multi-session support
  33  *  10/17/98      added freespace count for "df"
  34  *  11/11/98 gr   added novrs option
  35  *  11/26/98 dgb  added fileset,anchor mount options
  36  *  12/06/98 blf  really hosed things royally. vat/sparing support. sequenced
  37  *                vol descs. rewrote option handling based on isofs
  38  *  12/20/98      find the free space bitmap (if it exists)
  39  */
  40
  41 #include "udfdecl.h"
  42
  43 #include <linux/blkdev.h>
  44 #include <linux/slab.h>
  45 #include <linux/kernel.h>
  46 #include <linux/module.h>
  47 #include <linux/parser.h>
  48 #include <linux/stat.h>
  49 #include <linux/cdrom.h>
  50 #include <linux/nls.h>
  51 #include <linux/buffer_head.h>
  52 #include <linux/vfs.h>
  53 #include <linux/vmalloc.h>
  54 #include <linux/errno.h>
  55 #include <linux/mount.h>
  56 #include <linux/seq_file.h>
  57 #include <linux/bitmap.h>
  58 #include <linux/crc-itu-t.h>
  59 #include <linux/log2.h>
  60 #include <asm/byteorder.h>
  61
  62 #include "udf_sb.h"
  63 #include "udf_i.h"
  64
  65 #include <linux/init.h>
  66 #include <asm/uaccess.h>
  67
  68 #define VDS_POS_PRIMARY_VOL_DESC        0
  69 #define VDS_POS_UNALLOC_SPACE_DESC      1
  70 #define VDS_POS_LOGICAL_VOL_DESC        2
  71 #define VDS_POS_PARTITION_DESC          3
  72 #define VDS_POS_IMP_USE_VOL_DESC        4
  73 #define VDS_POS_VOL_DESC_PTR            5
  74 #define VDS_POS_TERMINATING_DESC        6
  75 #define VDS_POS_LENGTH                  7
  76
  77 #define UDF_DEFAULT_BLOCKSIZE 2048
  78
  79 enum { UDF_MAX_LINKS = 0xffff };
  80
  81 /* These are the "meat" - everything else is stuffing */
  82 static int udf_fill_super(struct super_block *, void *, int);
  83 static void udf_put_super(struct super_block *);
  84 static int udf_sync_fs(struct super_block *, int);
  85 static int udf_remount_fs(struct super_block *, int *, char *);
  86 static void udf_load_logicalvolint(struct super_block *, struct kernel_extent_ad);
  87 static int udf_find_fileset(struct super_block *, struct kernel_lb_addr *,
  88                             struct kernel_lb_addr *);
  89 static void udf_load_fileset(struct super_block *, struct buffer_head *,
  90                              struct kernel_lb_addr *);
  91 static void udf_open_lvid(struct super_block *);
  92 static void udf_close_lvid(struct super_block *);
  93 static unsigned int udf_count_free(struct super_block *);
  94 static int udf_statfs(struct dentry *, struct kstatfs *);
  95 static int udf_show_options(struct seq_file *, struct dentry *);
  96
  97 struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct udf_sb_info *sbi)
  98 {
  99         struct logicalVolIntegrityDesc *lvid =
 100                 (struct logicalVolIntegrityDesc *)sbi->s_lvid_bh->b_data;
 101         __u32 number_of_partitions = le32_to_cpu(lvid->numOfPartitions);
 102         __u32 offset = number_of_partitions * 2 *
 103                                 sizeof(uint32_t)/sizeof(uint8_t);
 104         return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
 105 }
 106
 107 /* UDF filesystem type */
 108 static struct dentry *udf_mount(struct file_system_type *fs_type,
 109                       int flags, const char *dev_name, void *data)
 110 {
 111         return mount_bdev(fs_type, flags, dev_name, data, udf_fill_super);
 112 }
 113
 114 static struct file_system_type udf_fstype = {
 115         .owner          = THIS_MODULE,
 116         .name           = "udf",
 117         .mount          = udf_mount,
 118         .kill_sb        = kill_block_super,
 119         .fs_flags       = FS_REQUIRES_DEV,
 120 };
 121 MODULE_ALIAS_FS("udf");
 122
 123 static struct kmem_cache *udf_inode_cachep;
 124
 125 static struct inode *udf_alloc_inode(struct super_block *sb)
 126 {
 127         struct udf_inode_info *ei;
 128         ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
 129         if (!ei)
 130                 return NULL;
 131
 132         ei->i_unique = 0;
 133         ei->i_lenExtents = 0;
 134         ei->i_next_alloc_block = 0;
 135         ei->i_next_alloc_goal = 0;
 136         ei->i_strat4096 = 0;
 137         init_rwsem(&ei->i_data_sem);
 138         ei->cached_extent.lstart = -1;
 139         spin_lock_init(&ei->i_extent_cache_lock);
 140
 141         return &ei->vfs_inode;
 142 }
 143
 144 static void udf_i_callback(struct rcu_head *head)
 145 {
 146         struct inode *inode = container_of(head, struct inode, i_rcu);
 147         kmem_cache_free(udf_inode_cachep, UDF_I(inode));
 148 }
 149
 150 static void udf_destroy_inode(struct inode *inode)
 151 {
 152         call_rcu(&inode->i_rcu, udf_i_callback);
 153 }
 154
 155 static void init_once(void *foo)
 156 {
 157         struct udf_inode_info *ei = (struct udf_inode_info *)foo;
 158
 159         ei->i_ext.i_data = NULL;
 160         inode_init_once(&ei->vfs_inode);
 161 }
 162
 163 static int init_inodecache(void)
 164 {
 165         udf_inode_cachep = kmem_cache_create("udf_inode_cache",
 166                                              sizeof(struct udf_inode_info),
 167                                              0, (SLAB_RECLAIM_ACCOUNT |
 168                                                  SLAB_MEM_SPREAD),
 169                                              init_once);
 170         if (!udf_inode_cachep)
 171                 return -ENOMEM;
 172         return 0;
 173 }
 174
 175 static void destroy_inodecache(void)
 176 {
 177         /*
 178          * Make sure all delayed rcu free inodes are flushed before we
 179          * destroy cache.
 180          */
 181         rcu_barrier();
 182         kmem_cache_destroy(udf_inode_cachep);
 183 }
 184
 185 /* Superblock operations */
 186 static const struct super_operations udf_sb_ops = {
 187         .alloc_inode    = udf_alloc_inode,
 188         .destroy_inode  = udf_destroy_inode,
 189         .write_inode    = udf_write_inode,
 190         .evict_inode    = udf_evict_inode,
 191         .put_super      = udf_put_super,
 192         .sync_fs        = udf_sync_fs,
 193         .statfs         = udf_statfs,
 194         .remount_fs     = udf_remount_fs,
 195         .show_options   = udf_show_options,
 196 };
 197
 198 struct udf_options {
 199         unsigned char novrs;
 200         unsigned int blocksize;
 201         unsigned int session;
 202         unsigned int lastblock;
 203         unsigned int anchor;
 204         unsigned int volume;
 205         unsigned short partition;
 206         unsigned int fileset;
 207         unsigned int rootdir;
 208         unsigned int flags;
 209         umode_t umask;
 210         kgid_t gid;
 211         kuid_t uid;
 212         umode_t fmode;
 213         umode_t dmode;
 214         struct nls_table *nls_map;
 215 };
 216
 217 static int __init init_udf_fs(void)
 218 {
 219         int err;
 220
 221         err = init_inodecache();
 222         if (err)
 223                 goto out1;
 224         err = register_filesystem(&udf_fstype);
 225         if (err)
 226                 goto out;
 227
 228         return 0;
 229
 230 out:
 231         destroy_inodecache();
 232
 233 out1:
 234         return err;
 235 }
 236
 237 static void __exit exit_udf_fs(void)
 238 {
 239         unregister_filesystem(&udf_fstype);
 240         destroy_inodecache();
 241 }
 242
 243 module_init(init_udf_fs)
 244 module_exit(exit_udf_fs)
 245
 246 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
 247 {
 248         struct udf_sb_info *sbi = UDF_SB(sb);
 249
 250         sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map),
 251                                   GFP_KERNEL);
 252         if (!sbi->s_partmaps) {
 253                 udf_err(sb, "Unable to allocate space for %d partition maps\n",
 254                         count);
 255                 sbi->s_partitions = 0;
 256                 return -ENOMEM;
 257         }
 258
 259         sbi->s_partitions = count;
 260         return 0;
 261 }
 262
 263 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
 264 {
 265         int i;
 266         int nr_groups = bitmap->s_nr_groups;
 267         int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
 268                                                 nr_groups);
 269
 270         for (i = 0; i < nr_groups; i++)
 271                 if (bitmap->s_block_bitmap[i])
 272                         brelse(bitmap->s_block_bitmap[i]);
 273
 274         if (size <= PAGE_SIZE)
 275                 kfree(bitmap);
 276         else
 277                 vfree(bitmap);
 278 }
 279
 280 static void udf_free_partition(struct udf_part_map *map)
 281 {
 282         int i;
 283         struct udf_meta_data *mdata;
 284
 285         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
 286                 iput(map->s_uspace.s_table);
 287         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
 288                 iput(map->s_fspace.s_table);
 289         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
 290                 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
 291         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
 292                 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
 293         if (map->s_partition_type == UDF_SPARABLE_MAP15)
 294                 for (i = 0; i < 4; i++)
 295                         brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
 296         else if (map->s_partition_type == UDF_METADATA_MAP25) {
 297                 mdata = &map->s_type_specific.s_metadata;
 298                 iput(mdata->s_metadata_fe);
 299                 mdata->s_metadata_fe = NULL;
 300
 301                 iput(mdata->s_mirror_fe);
 302                 mdata->s_mirror_fe = NULL;
 303
 304                 iput(mdata->s_bitmap_fe);
 305                 mdata->s_bitmap_fe = NULL;
 306         }
 307 }
 308
 309 static void udf_sb_free_partitions(struct super_block *sb)
 310 {
 311         struct udf_sb_info *sbi = UDF_SB(sb);
 312         int i;
 313         if (sbi->s_partmaps == NULL)
 314                 return;
 315         for (i = 0; i < sbi->s_partitions; i++)
 316                 udf_free_partition(&sbi->s_partmaps[i]);
 317         kfree(sbi->s_partmaps);
 318         sbi->s_partmaps = NULL;
 319 }
 320
 321 static int udf_show_options(struct seq_file *seq, struct dentry *root)
 322 {
 323         struct super_block *sb = root->d_sb;
 324         struct udf_sb_info *sbi = UDF_SB(sb);
 325
 326         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
 327                 seq_puts(seq, ",nostrict");
 328         if (UDF_QUERY_FLAG(sb, UDF_FLAG_BLOCKSIZE_SET))
 329                 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
 330         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
 331                 seq_puts(seq, ",unhide");
 332         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
 333                 seq_puts(seq, ",undelete");
 334         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
 335                 seq_puts(seq, ",noadinicb");
 336         if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
 337                 seq_puts(seq, ",shortad");
 338         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
 339                 seq_puts(seq, ",uid=forget");
 340         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_IGNORE))
 341                 seq_puts(seq, ",uid=ignore");
 342         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
 343                 seq_puts(seq, ",gid=forget");
 344         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE))
 345                 seq_puts(seq, ",gid=ignore");
 346         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
 347                 seq_printf(seq, ",uid=%u", from_kuid(&init_user_ns, sbi->s_uid));
 348         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
 349                 seq_printf(seq, ",gid=%u", from_kgid(&init_user_ns, sbi->s_gid));
 350         if (sbi->s_umask != 0)
 351                 seq_printf(seq, ",umask=%ho", sbi->s_umask);
 352         if (sbi->s_fmode != UDF_INVALID_MODE)
 353                 seq_printf(seq, ",mode=%ho", sbi->s_fmode);
 354         if (sbi->s_dmode != UDF_INVALID_MODE)
 355                 seq_printf(seq, ",dmode=%ho", sbi->s_dmode);
 356         if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
 357                 seq_printf(seq, ",session=%u", sbi->s_session);
 358         if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
 359                 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
 360         if (sbi->s_anchor != 0)
 361                 seq_printf(seq, ",anchor=%u", sbi->s_anchor);
 362         /*
 363          * volume, partition, fileset and rootdir seem to be ignored
 364          * currently
 365          */
 366         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
 367                 seq_puts(seq, ",utf8");
 368         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
 369                 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
 370
 371         return 0;
 372 }
 373
 374 /*
 375  * udf_parse_options
 376  *
 377  * PURPOSE
 378  *      Parse mount options.
 379  *
 380  * DESCRIPTION
 381  *      The following mount options are supported:
 382  *
 383  *      gid=            Set the default group.
 384  *      umask=          Set the default umask.
 385  *      mode=           Set the default file permissions.
 386  *      dmode=          Set the default directory permissions.
 387  *      uid=            Set the default user.
 388  *      bs=             Set the block size.
 389  *      unhide          Show otherwise hidden files.
 390  *      undelete        Show deleted files in lists.
 391  *      adinicb         Embed data in the inode (default)
 392  *      noadinicb       Don't embed data in the inode
 393  *      shortad         Use short ad's
 394  *      longad          Use long ad's (default)
 395  *      nostrict        Unset strict conformance
 396  *      iocharset=      Set the NLS character set
 397  *
 398  *      The remaining are for debugging and disaster recovery:
 399  *
 400  *      novrs           Skip volume sequence recognition
 401  *
 402  *      The following expect a offset from 0.
 403  *
 404  *      session=        Set the CDROM session (default= last session)
 405  *      anchor=         Override standard anchor location. (default= 256)
 406  *      volume=         Override the VolumeDesc location. (unused)
 407  *      partition=      Override the PartitionDesc location. (unused)
 408  *      lastblock=      Set the last block of the filesystem/
 409  *
 410  *      The following expect a offset from the partition root.
 411  *
 412  *      fileset=        Override the fileset block location. (unused)
 413  *      rootdir=        Override the root directory location. (unused)
 414  *              WARNING: overriding the rootdir to a non-directory may
 415  *              yield highly unpredictable results.
 416  *
 417  * PRE-CONDITIONS
 418  *      options         Pointer to mount options string.
 419  *      uopts           Pointer to mount options variable.
 420  *
 421  * POST-CONDITIONS
 422  *      <return>        1       Mount options parsed okay.
 423  *      <return>        0       Error parsing mount options.
 424  *
 425  * HISTORY
 426  *      July 1, 1997 - Andrew E. Mileski
 427  *      Written, tested, and released.
 428  */
 429
 430 enum {
 431         Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
 432         Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
 433         Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
 434         Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
 435         Opt_rootdir, Opt_utf8, Opt_iocharset,
 436         Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore,
 437         Opt_fmode, Opt_dmode
 438 };
 439
 440 static const match_table_t tokens = {
 441         {Opt_novrs,     "novrs"},
 442         {Opt_nostrict,  "nostrict"},
 443         {Opt_bs,        "bs=%u"},
 444         {Opt_unhide,    "unhide"},
 445         {Opt_undelete,  "undelete"},
 446         {Opt_noadinicb, "noadinicb"},
 447         {Opt_adinicb,   "adinicb"},
 448         {Opt_shortad,   "shortad"},
 449         {Opt_longad,    "longad"},
 450         {Opt_uforget,   "uid=forget"},
 451         {Opt_uignore,   "uid=ignore"},
 452         {Opt_gforget,   "gid=forget"},
 453         {Opt_gignore,   "gid=ignore"},
 454         {Opt_gid,       "gid=%u"},
 455         {Opt_uid,       "uid=%u"},
 456         {Opt_umask,     "umask=%o"},
 457         {Opt_session,   "session=%u"},
 458         {Opt_lastblock, "lastblock=%u"},
 459         {Opt_anchor,    "anchor=%u"},
 460         {Opt_volume,    "volume=%u"},
 461         {Opt_partition, "partition=%u"},
 462         {Opt_fileset,   "fileset=%u"},
 463         {Opt_rootdir,   "rootdir=%u"},
 464         {Opt_utf8,      "utf8"},
 465         {Opt_iocharset, "iocharset=%s"},
 466         {Opt_fmode,     "mode=%o"},
 467         {Opt_dmode,     "dmode=%o"},
 468         {Opt_err,       NULL}
 469 };
 470
 471 static int udf_parse_options(char *options, struct udf_options *uopt,
 472                              bool remount)
 473 {
 474         char *p;
 475         int option;
 476
 477         uopt->novrs = 0;
 478         uopt->partition = 0xFFFF;
 479         uopt->session = 0xFFFFFFFF;
 480         uopt->lastblock = 0;
 481         uopt->anchor = 0;
 482         uopt->volume = 0xFFFFFFFF;
 483         uopt->rootdir = 0xFFFFFFFF;
 484         uopt->fileset = 0xFFFFFFFF;
 485         uopt->nls_map = NULL;
 486
 487         if (!options)
 488                 return 1;
 489
 490         while ((p = strsep(&options, ",")) != NULL) {
 491                 substring_t args[MAX_OPT_ARGS];
 492                 int token;
 493                 if (!*p)
 494                         continue;
 495
 496                 token = match_token(p, tokens, args);
 497                 switch (token) {
 498                 case Opt_novrs:
 499                         uopt->novrs = 1;
 500                         break;
 501                 case Opt_bs:
 502                         if (match_int(&args[0], &option))
 503                                 return 0;
 504                         uopt->blocksize = option;
 505                         uopt->flags |= (1 << UDF_FLAG_BLOCKSIZE_SET);
 506                         break;
 507                 case Opt_unhide:
 508                         uopt->flags |= (1 << UDF_FLAG_UNHIDE);
 509                         break;
 510                 case Opt_undelete:
 511                         uopt->flags |= (1 << UDF_FLAG_UNDELETE);
 512                         break;
 513                 case Opt_noadinicb:
 514                         uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
 515                         break;
 516                 case Opt_adinicb:
 517                         uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
 518                         break;
 519                 case Opt_shortad:
 520                         uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
 521                         break;
 522                 case Opt_longad:
 523                         uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
 524                         break;
 525                 case Opt_gid:
 526                         if (match_int(args, &option))
 527                                 return 0;
 528                         uopt->gid = make_kgid(current_user_ns(), option);
 529                         if (!gid_valid(uopt->gid))
 530                                 return 0;
 531                         uopt->flags |= (1 << UDF_FLAG_GID_SET);
 532                         break;
 533                 case Opt_uid:
 534                         if (match_int(args, &option))
 535                                 return 0;
 536                         uopt->uid = make_kuid(current_user_ns(), option);
 537                         if (!uid_valid(uopt->uid))
 538                                 return 0;
 539                         uopt->flags |= (1 << UDF_FLAG_UID_SET);
 540                         break;
 541                 case Opt_umask:
 542                         if (match_octal(args, &option))
 543                                 return 0;
 544                         uopt->umask = option;
 545                         break;
 546                 case Opt_nostrict:
 547                         uopt->flags &= ~(1 << UDF_FLAG_STRICT);
 548                         break;
 549                 case Opt_session:
 550                         if (match_int(args, &option))
 551                                 return 0;
 552                         uopt->session = option;
 553                         if (!remount)
 554                                 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
 555                         break;
 556                 case Opt_lastblock:
 557                         if (match_int(args, &option))
 558                                 return 0;
 559                         uopt->lastblock = option;
 560                         if (!remount)
 561                                 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
 562                         break;
 563                 case Opt_anchor:
 564                         if (match_int(args, &option))
 565                                 return 0;
 566                         uopt->anchor = option;
 567                         break;
 568                 case Opt_volume:
 569                         if (match_int(args, &option))
 570                                 return 0;
 571                         uopt->volume = option;
 572                         break;
 573                 case Opt_partition:
 574                         if (match_int(args, &option))
 575                                 return 0;
 576                         uopt->partition = option;
 577                         break;
 578                 case Opt_fileset:
 579                         if (match_int(args, &option))
 580                                 return 0;
 581                         uopt->fileset = option;
 582                         break;
 583                 case Opt_rootdir:
 584                         if (match_int(args, &option))
 585                                 return 0;
 586                         uopt->rootdir = option;
 587                         break;
 588                 case Opt_utf8:
 589                         uopt->flags |= (1 << UDF_FLAG_UTF8);
 590                         break;
 591 #ifdef CONFIG_UDF_NLS
 592                 case Opt_iocharset:
 593                         uopt->nls_map = load_nls(args[0].from);
 594                         uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
 595                         break;
 596 #endif
 597                 case Opt_uignore:
 598                         uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
 599                         break;
 600                 case Opt_uforget:
 601                         uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
 602                         break;
 603                 case Opt_gignore:
 604                         uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
 605                         break;
 606                 case Opt_gforget:
 607                         uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
 608                         break;
 609                 case Opt_fmode:
 610                         if (match_octal(args, &option))
 611                                 return 0;
 612                         uopt->fmode = option & 0777;
 613                         break;
 614                 case Opt_dmode:
 615                         if (match_octal(args, &option))
 616                                 return 0;
 617                         uopt->dmode = option & 0777;
 618                         break;
 619                 default:
 620                         pr_err("bad mount option \"%s\" or missing value\n", p);
 621                         return 0;
 622                 }
 623         }
 624         return 1;
 625 }
 626
 627 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
 628 {
 629         struct udf_options uopt;
 630         struct udf_sb_info *sbi = UDF_SB(sb);
 631         int error = 0;
 632         sync_filesystem(sb);
 633
 634         if (sbi->s_lvid_bh) {
 635                 int write_rev = le16_to_cpu(udf_sb_lvidiu(sbi)->minUDFWriteRev);
 636                 if (write_rev > UDF_MAX_WRITE_VERSION && !(*flags & MS_RDONLY))
 637                         return -EACCES;
 638         }
 639
 640         uopt.flags = sbi->s_flags;
 641         uopt.uid   = sbi->s_uid;
 642         uopt.gid   = sbi->s_gid;
 643         uopt.umask = sbi->s_umask;
 644         uopt.fmode = sbi->s_fmode;
 645         uopt.dmode = sbi->s_dmode;
 646
 647         if (!udf_parse_options(options, &uopt, true))
 648                 return -EINVAL;
 649
 650         write_lock(&sbi->s_cred_lock);
 651         sbi->s_flags = uopt.flags;
 652         sbi->s_uid   = uopt.uid;
 653         sbi->s_gid   = uopt.gid;
 654         sbi->s_umask = uopt.umask;
 655         sbi->s_fmode = uopt.fmode;
 656         sbi->s_dmode = uopt.dmode;
 657         write_unlock(&sbi->s_cred_lock);
 658
 659         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 660                 goto out_unlock;
 661
 662         if (*flags & MS_RDONLY)
 663                 udf_close_lvid(sb);
 664         else
 665                 udf_open_lvid(sb);
 666
 667 out_unlock:
 668         return error;
 669 }
 670
 671 /* Check Volume Structure Descriptors (ECMA 167 2/9.1) */
 672 /* We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
 673 static loff_t udf_check_vsd(struct super_block *sb)
 674 {
 675         struct volStructDesc *vsd = NULL;
 676         loff_t sector = 32768;
 677         int sectorsize;
 678         struct buffer_head *bh = NULL;
 679         int nsr02 = 0;
 680         int nsr03 = 0;
 681         struct udf_sb_info *sbi;
 682
 683         sbi = UDF_SB(sb);
 684         if (sb->s_blocksize < sizeof(struct volStructDesc))
 685                 sectorsize = sizeof(struct volStructDesc);
 686         else
 687                 sectorsize = sb->s_blocksize;
 688
 689         sector += (sbi->s_session << sb->s_blocksize_bits);
 690
 691         udf_debug("Starting at sector %u (%ld byte sectors)\n",
 692                   (unsigned int)(sector >> sb->s_blocksize_bits),
 693                   sb->s_blocksize);
 694         /* Process the sequence (if applicable) */
 695         for (; !nsr02 && !nsr03; sector += sectorsize) {
 696                 /* Read a block */
 697                 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
 698                 if (!bh)
 699                         break;
 700
 701                 /* Look for ISO  descriptors */
 702                 vsd = (struct volStructDesc *)(bh->b_data +
 703                                               (sector & (sb->s_blocksize - 1)));
 704
 705                 if (vsd->stdIdent[0] == 0) {
 706                         brelse(bh);
 707                         break;
 708                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
 709                                     VSD_STD_ID_LEN)) {
 710                         switch (vsd->structType) {
 711                         case 0:
 712                                 udf_debug("ISO9660 Boot Record found\n");
 713                                 break;
 714                         case 1:
 715                                 udf_debug("ISO9660 Primary Volume Descriptor found\n");
 716                                 break;
 717                         case 2:
 718                                 udf_debug("ISO9660 Supplementary Volume Descriptor found\n");
 719                                 break;
 720                         case 3:
 721                                 udf_debug("ISO9660 Volume Partition Descriptor found\n");
 722                                 break;
 723                         case 255:
 724                                 udf_debug("ISO9660 Volume Descriptor Set Terminator found\n");
 725                                 break;
 726                         default:
 727                                 udf_debug("ISO9660 VRS (%u) found\n",
 728                                           vsd->structType);
 729                                 break;
 730                         }
 731                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
 732                                     VSD_STD_ID_LEN))
 733                         ; /* nothing */
 734                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
 735                                     VSD_STD_ID_LEN)) {
 736                         brelse(bh);
 737                         break;
 738                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
 739                                     VSD_STD_ID_LEN))
 740                         nsr02 = sector;
 741                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
 742                                     VSD_STD_ID_LEN))
 743                         nsr03 = sector;
 744                 brelse(bh);
 745         }
 746
 747         if (nsr03)
 748                 return nsr03;
 749         else if (nsr02)
 750                 return nsr02;
 751         else if (sector - (sbi->s_session << sb->s_blocksize_bits) == 32768)
 752                 return -1;
 753         else
 754                 return 0;
 755 }
 756
 757 static int udf_find_fileset(struct super_block *sb,
 758                             struct kernel_lb_addr *fileset,
 759                             struct kernel_lb_addr *root)
 760 {
 761         struct buffer_head *bh = NULL;
 762         long lastblock;
 763         uint16_t ident;
 764         struct udf_sb_info *sbi;
 765
 766         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
 767             fileset->partitionReferenceNum != 0xFFFF) {
 768                 bh = udf_read_ptagged(sb, fileset, 0, &ident);
 769
 770                 if (!bh) {
 771                         return 1;
 772                 } else if (ident != TAG_IDENT_FSD) {
 773                         brelse(bh);
 774                         return 1;
 775                 }
 776
 777         }
 778
 779         sbi = UDF_SB(sb);
 780         if (!bh) {
 781                 /* Search backwards through the partitions */
 782                 struct kernel_lb_addr newfileset;
 783
 784 /* --> cvg: FIXME - is it reasonable? */
 785                 return 1;
 786
 787                 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
 788                      (newfileset.partitionReferenceNum != 0xFFFF &&
 789                       fileset->logicalBlockNum == 0xFFFFFFFF &&
 790                       fileset->partitionReferenceNum == 0xFFFF);
 791                      newfileset.partitionReferenceNum--) {
 792                         lastblock = sbi->s_partmaps
 793                                         [newfileset.partitionReferenceNum]
 794                                                 .s_partition_len;
 795                         newfileset.logicalBlockNum = 0;
 796
 797                         do {
 798                                 bh = udf_read_ptagged(sb, &newfileset, 0,
 799                                                       &ident);
 800                                 if (!bh) {
 801                                         newfileset.logicalBlockNum++;
 802                                         continue;
 803                                 }
 804
 805                                 switch (ident) {
 806                                 case TAG_IDENT_SBD:
 807                                 {
 808                                         struct spaceBitmapDesc *sp;
 809                                         sp = (struct spaceBitmapDesc *)
 810                                                                 bh->b_data;
 811                                         newfileset.logicalBlockNum += 1 +
 812                                                 ((le32_to_cpu(sp->numOfBytes) +
 813                                                   sizeof(struct spaceBitmapDesc)
 814                                                   - 1) >> sb->s_blocksize_bits);
 815                                         brelse(bh);
 816                                         break;
 817                                 }
 818                                 case TAG_IDENT_FSD:
 819                                         *fileset = newfileset;
 820                                         break;
 821                                 default:
 822                                         newfileset.logicalBlockNum++;
 823                                         brelse(bh);
 824                                         bh = NULL;
 825                                         break;
 826                                 }
 827                         } while (newfileset.logicalBlockNum < lastblock &&
 828                                  fileset->logicalBlockNum == 0xFFFFFFFF &&
 829                                  fileset->partitionReferenceNum == 0xFFFF);
 830                 }
 831         }
 832
 833         if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
 834              fileset->partitionReferenceNum != 0xFFFF) && bh) {
 835                 udf_debug("Fileset at block=%d, partition=%d\n",
 836                           fileset->logicalBlockNum,
 837                           fileset->partitionReferenceNum);
 838
 839                 sbi->s_partition = fileset->partitionReferenceNum;
 840                 udf_load_fileset(sb, bh, root);
 841                 brelse(bh);
 842                 return 0;
 843         }
 844         return 1;
 845 }
 846
 847 /*
 848  * Load primary Volume Descriptor Sequence
 849  *
 850  * Return <0 on error, 0 on success. -EAGAIN is special meaning next sequence
 851  * should be tried.
 852  */
 853 static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
 854 {
 855         struct primaryVolDesc *pvoldesc;
 856         struct ustr *instr, *outstr;
 857         struct buffer_head *bh;
 858         uint16_t ident;
 859         int ret = -ENOMEM;
 860
 861         instr = kmalloc(sizeof(struct ustr), GFP_NOFS);
 862         if (!instr)
 863                 return -ENOMEM;
 864
 865         outstr = kmalloc(sizeof(struct ustr), GFP_NOFS);
 866         if (!outstr)
 867                 goto out1;
 868
 869         bh = udf_read_tagged(sb, block, block, &ident);
 870         if (!bh) {
 871                 ret = -EAGAIN;
 872                 goto out2;
 873         }
 874
 875         if (ident != TAG_IDENT_PVD) {
 876                 ret = -EIO;
 877                 goto out_bh;
 878         }
 879
 880         pvoldesc = (struct primaryVolDesc *)bh->b_data;
 881
 882         if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
 883                               pvoldesc->recordingDateAndTime)) {
 884 #ifdef UDFFS_DEBUG
 885                 struct timestamp *ts = &pvoldesc->recordingDateAndTime;
 886                 udf_debug("recording time %04u/%02u/%02u %02u:%02u (%x)\n",
 887                           le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
 888                           ts->minute, le16_to_cpu(ts->typeAndTimezone));
 889 #endif
 890         }
 891
 892         if (!udf_build_ustr(instr, pvoldesc->volIdent, 32))
 893                 if (udf_CS0toUTF8(outstr, instr)) {
 894                         strncpy(UDF_SB(sb)->s_volume_ident, outstr->u_name,
 895                                 outstr->u_len > 31 ? 31 : outstr->u_len);
 896                         udf_debug("volIdent[] = '%s'\n",
 897                                   UDF_SB(sb)->s_volume_ident);
 898                 }
 899
 900         if (!udf_build_ustr(instr, pvoldesc->volSetIdent, 128))
 901                 if (udf_CS0toUTF8(outstr, instr))
 902                         udf_debug("volSetIdent[] = '%s'\n", outstr->u_name);
 903
 904         ret = 0;
 905 out_bh:
 906         brelse(bh);
 907 out2:
 908         kfree(outstr);
 909 out1:
 910         kfree(instr);
 911         return ret;
 912 }
 913
 914 struct inode *udf_find_metadata_inode_efe(struct super_block *sb,
 915                                         u32 meta_file_loc, u32 partition_num)
 916 {
 917         struct kernel_lb_addr addr;
 918         struct inode *metadata_fe;
 919
 920         addr.logicalBlockNum = meta_file_loc;
 921         addr.partitionReferenceNum = partition_num;
 922
 923         metadata_fe = udf_iget(sb, &addr);
 924
 925         if (metadata_fe == NULL)
 926                 udf_warn(sb, "metadata inode efe not found\n");
 927         else if (UDF_I(metadata_fe)->i_alloc_type != ICBTAG_FLAG_AD_SHORT) {
 928                 udf_warn(sb, "metadata inode efe does not have short allocation descriptors!\n");
 929                 iput(metadata_fe);
 930                 metadata_fe = NULL;
 931         }
 932
 933         return metadata_fe;
 934 }
 935
 936 static int udf_load_metadata_files(struct super_block *sb, int partition)
 937 {
 938         struct udf_sb_info *sbi = UDF_SB(sb);
 939         struct udf_part_map *map;
 940         struct udf_meta_data *mdata;
 941         struct kernel_lb_addr addr;
 942
 943         map = &sbi->s_partmaps[partition];
 944         mdata = &map->s_type_specific.s_metadata;
 945
 946         /* metadata address */
 947         udf_debug("Metadata file location: block = %d part = %d\n",
 948                   mdata->s_meta_file_loc, map->s_partition_num);
 949
 950         mdata->s_metadata_fe = udf_find_metadata_inode_efe(sb,
 951                 mdata->s_meta_file_loc, map->s_partition_num);
 952
 953         if (mdata->s_metadata_fe == NULL) {
 954                 /* mirror file entry */
 955                 udf_debug("Mirror metadata file location: block = %d part = %d\n",
 956                           mdata->s_mirror_file_loc, map->s_partition_num);
 957
 958                 mdata->s_mirror_fe = udf_find_metadata_inode_efe(sb,
 959                         mdata->s_mirror_file_loc, map->s_partition_num);
 960
 961                 if (mdata->s_mirror_fe == NULL) {
 962                         udf_err(sb, "Both metadata and mirror metadata inode efe can not found\n");
 963                         return -EIO;
 964                 }
 965         }
 966
 967         /*
 968          * bitmap file entry
 969          * Note:
 970          * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
 971         */
 972         if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
 973                 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
 974                 addr.partitionReferenceNum = map->s_partition_num;
 975
 976                 udf_debug("Bitmap file location: block = %d part = %d\n",
 977                           addr.logicalBlockNum, addr.partitionReferenceNum);
 978
 979                 mdata->s_bitmap_fe = udf_iget(sb, &addr);
 980                 if (mdata->s_bitmap_fe == NULL) {
 981                         if (sb->s_flags & MS_RDONLY)
 982                                 udf_warn(sb, "bitmap inode efe not found but it's ok since the disc is mounted read-only\n");
 983                         else {
 984                                 udf_err(sb, "bitmap inode efe not found and attempted read-write mount\n");
 985                                 return -EIO;
 986                         }
 987                 }
 988         }
 989
 990         udf_debug("udf_load_metadata_files Ok\n");
 991         return 0;
 992 }
 993
 994 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
 995                              struct kernel_lb_addr *root)
 996 {
 997         struct fileSetDesc *fset;
 998
 999         fset = (struct fileSetDesc *)bh->b_data;
1000
1001         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
1002
1003         UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
1004
1005         udf_debug("Rootdir at block=%d, partition=%d\n",
1006                   root->logicalBlockNum, root->partitionReferenceNum);
1007 }
1008
1009 int udf_compute_nr_groups(struct super_block *sb, u32 partition)
1010 {
1011         struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
1012         return DIV_ROUND_UP(map->s_partition_len +
1013                             (sizeof(struct spaceBitmapDesc) << 3),
1014                             sb->s_blocksize * 8);
1015 }
1016
1017 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
1018 {
1019         struct udf_bitmap *bitmap;
1020         int nr_groups;
1021         int size;
1022
1023         nr_groups = udf_compute_nr_groups(sb, index);
1024         size = sizeof(struct udf_bitmap) +
1025                 (sizeof(struct buffer_head *) * nr_groups);
1026
1027         if (size <= PAGE_SIZE)
1028                 bitmap = kzalloc(size, GFP_KERNEL);
1029         else
1030                 bitmap = vzalloc(size); /* TODO: get rid of vzalloc */
1031
1032         if (bitmap == NULL)
1033                 return NULL;
1034
1035         bitmap->s_nr_groups = nr_groups;
1036         return bitmap;
1037 }
1038
1039 static int udf_fill_partdesc_info(struct super_block *sb,
1040                 struct partitionDesc *p, int p_index)
1041 {
1042         struct udf_part_map *map;
1043         struct udf_sb_info *sbi = UDF_SB(sb);
1044         struct partitionHeaderDesc *phd;
1045
1046         map = &sbi->s_partmaps[p_index];
1047
1048         map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
1049         map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
1050
1051         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
1052                 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
1053         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
1054                 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
1055         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
1056                 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
1057         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
1058                 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
1059
1060         udf_debug("Partition (%d type %x) starts at physical %d, block length %d\n",
1061                   p_index, map->s_partition_type,
1062                   map->s_partition_root, map->s_partition_len);
1063
1064         if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1065             strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
1066                 return 0;
1067
1068         phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1069         if (phd->unallocSpaceTable.extLength) {
1070                 struct kernel_lb_addr loc = {
1071                         .logicalBlockNum = le32_to_cpu(
1072                                 phd->unallocSpaceTable.extPosition),
1073                         .partitionReferenceNum = p_index,
1074                 };
1075
1076                 map->s_uspace.s_table = udf_iget(sb, &loc);
1077                 if (!map->s_uspace.s_table) {
1078                         udf_debug("cannot load unallocSpaceTable (part %d)\n",
1079                                   p_index);
1080                         return -EIO;
1081                 }
1082                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1083                 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
1084                           p_index, map->s_uspace.s_table->i_ino);
1085         }
1086
1087         if (phd->unallocSpaceBitmap.extLength) {
1088                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1089                 if (!bitmap)
1090                         return -ENOMEM;
1091                 map->s_uspace.s_bitmap = bitmap;
1092                 bitmap->s_extPosition = le32_to_cpu(
1093                                 phd->unallocSpaceBitmap.extPosition);
1094                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1095                 udf_debug("unallocSpaceBitmap (part %d) @ %d\n",
1096                           p_index, bitmap->s_extPosition);
1097         }
1098
1099         if (phd->partitionIntegrityTable.extLength)
1100                 udf_debug("partitionIntegrityTable (part %d)\n", p_index);
1101
1102         if (phd->freedSpaceTable.extLength) {
1103                 struct kernel_lb_addr loc = {
1104                         .logicalBlockNum = le32_to_cpu(
1105                                 phd->freedSpaceTable.extPosition),
1106                         .partitionReferenceNum = p_index,
1107                 };
1108
1109                 map->s_fspace.s_table = udf_iget(sb, &loc);
1110                 if (!map->s_fspace.s_table) {
1111                         udf_debug("cannot load freedSpaceTable (part %d)\n",
1112                                   p_index);
1113                         return -EIO;
1114                 }
1115
1116                 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
1117                 udf_debug("freedSpaceTable (part %d) @ %ld\n",
1118                           p_index, map->s_fspace.s_table->i_ino);
1119         }
1120
1121         if (phd->freedSpaceBitmap.extLength) {
1122                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1123                 if (!bitmap)
1124                         return -ENOMEM;
1125                 map->s_fspace.s_bitmap = bitmap;
1126                 bitmap->s_extPosition = le32_to_cpu(
1127                                 phd->freedSpaceBitmap.extPosition);
1128                 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1129                 udf_debug("freedSpaceBitmap (part %d) @ %d\n",
1130                           p_index, bitmap->s_extPosition);
1131         }
1132         return 0;
1133 }
1134
1135 static void udf_find_vat_block(struct super_block *sb, int p_index,
1136                                int type1_index, sector_t start_block)
1137 {
1138         struct udf_sb_info *sbi = UDF_SB(sb);
1139         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1140         sector_t vat_block;
1141         struct kernel_lb_addr ino;
1142
1143         /*
1144          * VAT file entry is in the last recorded block. Some broken disks have
1145          * it a few blocks before so try a bit harder...
1146          */
1147         ino.partitionReferenceNum = type1_index;
1148         for (vat_block = start_block;
1149              vat_block >= map->s_partition_root &&
1150              vat_block >= start_block - 3 &&
1151              !sbi->s_vat_inode; vat_block--) {
1152                 ino.logicalBlockNum = vat_block - map->s_partition_root;
1153                 sbi->s_vat_inode = udf_iget(sb, &ino);
1154         }
1155 }
1156
1157 static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1158 {
1159         struct udf_sb_info *sbi = UDF_SB(sb);
1160         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1161         struct buffer_head *bh = NULL;
1162         struct udf_inode_info *vati;
1163         uint32_t pos;
1164         struct virtualAllocationTable20 *vat20;
1165         sector_t blocks = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
1166
1167         udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block);
1168         if (!sbi->s_vat_inode &&
1169             sbi->s_last_block != blocks - 1) {
1170                 pr_notice("Failed to read VAT inode from the last recorded block (%lu), retrying with the last block of the device (%lu).\n",
1171                           (unsigned long)sbi->s_last_block,
1172                           (unsigned long)blocks - 1);
1173                 udf_find_vat_block(sb, p_index, type1_index, blocks - 1);
1174         }
1175         if (!sbi->s_vat_inode)
1176                 return -EIO;
1177
1178         if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1179                 map->s_type_specific.s_virtual.s_start_offset = 0;
1180                 map->s_type_specific.s_virtual.s_num_entries =
1181                         (sbi->s_vat_inode->i_size - 36) >> 2;
1182         } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1183                 vati = UDF_I(sbi->s_vat_inode);
1184                 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1185                         pos = udf_block_map(sbi->s_vat_inode, 0);
1186                         bh = sb_bread(sb, pos);
1187                         if (!bh)
1188                                 return -EIO;
1189                         vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1190                 } else {
1191                         vat20 = (struct virtualAllocationTable20 *)
1192                                                         vati->i_ext.i_data;
1193                 }
1194
1195                 map->s_type_specific.s_virtual.s_start_offset =
1196                         le16_to_cpu(vat20->lengthHeader);
1197                 map->s_type_specific.s_virtual.s_num_entries =
1198                         (sbi->s_vat_inode->i_size -
1199                                 map->s_type_specific.s_virtual.
1200                                         s_start_offset) >> 2;
1201                 brelse(bh);
1202         }
1203         return 0;
1204 }
1205
1206 /*
1207  * Load partition descriptor block
1208  *
1209  * Returns <0 on error, 0 on success, -EAGAIN is special - try next descriptor
1210  * sequence.
1211  */
1212 static int udf_load_partdesc(struct super_block *sb, sector_t block)
1213 {
1214         struct buffer_head *bh;
1215         struct partitionDesc *p;
1216         struct udf_part_map *map;
1217         struct udf_sb_info *sbi = UDF_SB(sb);
1218         int i, type1_idx;
1219         uint16_t partitionNumber;
1220         uint16_t ident;
1221         int ret;
1222
1223         bh = udf_read_tagged(sb, block, block, &ident);
1224         if (!bh)
1225                 return -EAGAIN;
1226         if (ident != TAG_IDENT_PD) {
1227                 ret = 0;
1228                 goto out_bh;
1229         }
1230
1231         p = (struct partitionDesc *)bh->b_data;
1232         partitionNumber = le16_to_cpu(p->partitionNumber);
1233
1234         /* First scan for TYPE1, SPARABLE and METADATA partitions */
1235         for (i = 0; i < sbi->s_partitions; i++) {
1236                 map = &sbi->s_partmaps[i];
1237                 udf_debug("Searching map: (%d == %d)\n",
1238                           map->s_partition_num, partitionNumber);
1239                 if (map->s_partition_num == partitionNumber &&
1240                     (map->s_partition_type == UDF_TYPE1_MAP15 ||
1241                      map->s_partition_type == UDF_SPARABLE_MAP15))
1242                         break;
1243         }
1244
1245         if (i >= sbi->s_partitions) {
1246                 udf_debug("Partition (%d) not found in partition map\n",
1247                           partitionNumber);
1248                 ret = 0;
1249                 goto out_bh;
1250         }
1251
1252         ret = udf_fill_partdesc_info(sb, p, i);
1253         if (ret < 0)
1254                 goto out_bh;
1255
1256         /*
1257          * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1258          * PHYSICAL partitions are already set up
1259          */
1260         type1_idx = i;
1261         for (i = 0; i < sbi->s_partitions; i++) {
1262                 map = &sbi->s_partmaps[i];
1263
1264                 if (map->s_partition_num == partitionNumber &&
1265                     (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1266                      map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1267                      map->s_partition_type == UDF_METADATA_MAP25))
1268                         break;
1269         }
1270
1271         if (i >= sbi->s_partitions) {
1272                 ret = 0;
1273                 goto out_bh;
1274         }
1275
1276         ret = udf_fill_partdesc_info(sb, p, i);
1277         if (ret < 0)
1278                 goto out_bh;
1279
1280         if (map->s_partition_type == UDF_METADATA_MAP25) {
1281                 ret = udf_load_metadata_files(sb, i);
1282                 if (ret < 0) {
1283                         udf_err(sb, "error loading MetaData partition map %d\n",
1284                                 i);
1285                         goto out_bh;
1286                 }
1287         } else {
1288                 /*
1289                  * If we have a partition with virtual map, we don't handle
1290                  * writing to it (we overwrite blocks instead of relocating
1291                  * them).
1292                  */
1293                 if (!(sb->s_flags & MS_RDONLY)) {
1294                         ret = -EACCES;
1295                         goto out_bh;
1296                 }
1297                 ret = udf_load_vat(sb, i, type1_idx);
1298                 if (ret < 0)
1299                         goto out_bh;
1300         }
1301         ret = 0;
1302 out_bh:
1303         /* In case loading failed, we handle cleanup in udf_fill_super */
1304         brelse(bh);
1305         return ret;
1306 }
1307
1308 static int udf_load_sparable_map(struct super_block *sb,
1309                                  struct udf_part_map *map,
1310                                  struct sparablePartitionMap *spm)
1311 {
1312         uint32_t loc;
1313         uint16_t ident;
1314         struct sparingTable *st;
1315         struct udf_sparing_data *sdata = &map->s_type_specific.s_sparing;
1316         int i;
1317         struct buffer_head *bh;
1318
1319         map->s_partition_type = UDF_SPARABLE_MAP15;
1320         sdata->s_packet_len = le16_to_cpu(spm->packetLength);
1321         if (!is_power_of_2(sdata->s_packet_len)) {
1322                 udf_err(sb, "error loading logical volume descriptor: "
1323                         "Invalid packet length %u\n",
1324                         (unsigned)sdata->s_packet_len);
1325                 return -EIO;
1326         }
1327         if (spm->numSparingTables > 4) {
1328                 udf_err(sb, "error loading logical volume descriptor: "
1329                         "Too many sparing tables (%d)\n",
1330                         (int)spm->numSparingTables);
1331                 return -EIO;
1332         }
1333
1334         for (i = 0; i < spm->numSparingTables; i++) {
1335                 loc = le32_to_cpu(spm->locSparingTable[i]);
1336                 bh = udf_read_tagged(sb, loc, loc, &ident);
1337                 if (!bh)
1338                         continue;
1339
1340                 st = (struct sparingTable *)bh->b_data;
1341                 if (ident != 0 ||
1342                     strncmp(st->sparingIdent.ident, UDF_ID_SPARING,
1343                             strlen(UDF_ID_SPARING)) ||
1344                     sizeof(*st) + le16_to_cpu(st->reallocationTableLen) >
1345                                                         sb->s_blocksize) {
1346                         brelse(bh);
1347                         continue;
1348                 }
1349
1350                 sdata->s_spar_map[i] = bh;
1351         }
1352         map->s_partition_func = udf_get_pblock_spar15;
1353         return 0;
1354 }
1355
1356 static int udf_load_logicalvol(struct super_block *sb, sector_t block,
1357                                struct kernel_lb_addr *fileset)
1358 {
1359         struct logicalVolDesc *lvd;
1360         int i, offset;
1361         uint8_t type;
1362         struct udf_sb_info *sbi = UDF_SB(sb);
1363         struct genericPartitionMap *gpm;
1364         uint16_t ident;
1365         struct buffer_head *bh;
1366         unsigned int table_len;
1367         int ret;
1368
1369         bh = udf_read_tagged(sb, block, block, &ident);
1370         if (!bh)
1371                 return -EAGAIN;
1372         BUG_ON(ident != TAG_IDENT_LVD);
1373         lvd = (struct logicalVolDesc *)bh->b_data;
1374         table_len = le32_to_cpu(lvd->mapTableLength);
1375         if (table_len > sb->s_blocksize - sizeof(*lvd)) {
1376                 udf_err(sb, "error loading logical volume descriptor: "
1377                         "Partition table too long (%u > %lu)\n", table_len,
1378                         sb->s_blocksize - sizeof(*lvd));
1379                 ret = -EIO;
1380                 goto out_bh;
1381         }
1382
1383         ret = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1384         if (ret)
1385                 goto out_bh;
1386
1387         for (i = 0, offset = 0;
1388              i < sbi->s_partitions && offset < table_len;
1389              i++, offset += gpm->partitionMapLength) {
1390                 struct udf_part_map *map = &sbi->s_partmaps[i];
1391                 gpm = (struct genericPartitionMap *)
1392                                 &(lvd->partitionMaps[offset]);
1393                 type = gpm->partitionMapType;
1394                 if (type == 1) {
1395                         struct genericPartitionMap1 *gpm1 =
1396                                 (struct genericPartitionMap1 *)gpm;
1397                         map->s_partition_type = UDF_TYPE1_MAP15;
1398                         map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1399                         map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1400                         map->s_partition_func = NULL;
1401                 } else if (type == 2) {
1402                         struct udfPartitionMap2 *upm2 =
1403                                                 (struct udfPartitionMap2 *)gpm;
1404                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1405                                                 strlen(UDF_ID_VIRTUAL))) {
1406                                 u16 suf =
1407                                         le16_to_cpu(((__le16 *)upm2->partIdent.
1408                                                         identSuffix)[0]);
1409                                 if (suf < 0x0200) {
1410                                         map->s_partition_type =
1411                                                         UDF_VIRTUAL_MAP15;
1412                                         map->s_partition_func =
1413                                                         udf_get_pblock_virt15;
1414                                 } else {
1415                                         map->s_partition_type =
1416                                                         UDF_VIRTUAL_MAP20;
1417                                         map->s_partition_func =
1418                                                         udf_get_pblock_virt20;
1419                                 }
1420                         } else if (!strncmp(upm2->partIdent.ident,
1421                                                 UDF_ID_SPARABLE,
1422                                                 strlen(UDF_ID_SPARABLE))) {
1423                                 ret = udf_load_sparable_map(sb, map,
1424                                         (struct sparablePartitionMap *)gpm);
1425                                 if (ret < 0)
1426                                         goto out_bh;
1427                         } else if (!strncmp(upm2->partIdent.ident,
1428                                                 UDF_ID_METADATA,
1429                                                 strlen(UDF_ID_METADATA))) {
1430                                 struct udf_meta_data *mdata =
1431                                         &map->s_type_specific.s_metadata;
1432                                 struct metadataPartitionMap *mdm =
1433                                                 (struct metadataPartitionMap *)
1434                                                 &(lvd->partitionMaps[offset]);
1435                                 udf_debug("Parsing Logical vol part %d type %d  id=%s\n",
1436                                           i, type, UDF_ID_METADATA);
1437
1438                                 map->s_partition_type = UDF_METADATA_MAP25;
1439                                 map->s_partition_func = udf_get_pblock_meta25;
1440
1441                                 mdata->s_meta_file_loc   =
1442                                         le32_to_cpu(mdm->metadataFileLoc);
1443                                 mdata->s_mirror_file_loc =
1444                                         le32_to_cpu(mdm->metadataMirrorFileLoc);
1445                                 mdata->s_bitmap_file_loc =
1446                                         le32_to_cpu(mdm->metadataBitmapFileLoc);
1447                                 mdata->s_alloc_unit_size =
1448                                         le32_to_cpu(mdm->allocUnitSize);
1449                                 mdata->s_align_unit_size =
1450                                         le16_to_cpu(mdm->alignUnitSize);
1451                                 if (mdm->flags & 0x01)
1452                                         mdata->s_flags |= MF_DUPLICATE_MD;
1453
1454                                 udf_debug("Metadata Ident suffix=0x%x\n",
1455                                           le16_to_cpu(*(__le16 *)
1456                                                       mdm->partIdent.identSuffix));
1457                                 udf_debug("Metadata part num=%d\n",
1458                                           le16_to_cpu(mdm->partitionNum));
1459                                 udf_debug("Metadata part alloc unit size=%d\n",
1460                                           le32_to_cpu(mdm->allocUnitSize));
1461                                 udf_debug("Metadata file loc=%d\n",
1462                                           le32_to_cpu(mdm->metadataFileLoc));
1463                                 udf_debug("Mirror file loc=%d\n",
1464                                           le32_to_cpu(mdm->metadataMirrorFileLoc));
1465                                 udf_debug("Bitmap file loc=%d\n",
1466                                           le32_to_cpu(mdm->metadataBitmapFileLoc));
1467                                 udf_debug("Flags: %d %d\n",
1468                                           mdata->s_flags, mdm->flags);
1469                         } else {
1470                                 udf_debug("Unknown ident: %s\n",
1471                                           upm2->partIdent.ident);
1472                                 continue;
1473                         }
1474                         map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1475                         map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1476                 }
1477                 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1478                           i, map->s_partition_num, type, map->s_volumeseqnum);
1479         }
1480
1481         if (fileset) {
1482                 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
1483
1484                 *fileset = lelb_to_cpu(la->extLocation);
1485                 udf_debug("FileSet found in LogicalVolDesc at block=%d, partition=%d\n",
1486                           fileset->logicalBlockNum,
1487                           fileset->partitionReferenceNum);
1488         }
1489         if (lvd->integritySeqExt.extLength)
1490                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1491         ret = 0;
1492 out_bh:
1493         brelse(bh);
1494         return ret;
1495 }
1496
1497 /*
1498  * udf_load_logicalvolint
1499  *
1500  */
1501 static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
1502 {
1503         struct buffer_head *bh = NULL;
1504         uint16_t ident;
1505         struct udf_sb_info *sbi = UDF_SB(sb);
1506         struct logicalVolIntegrityDesc *lvid;
1507
1508         while (loc.extLength > 0 &&
1509                (bh = udf_read_tagged(sb, loc.extLocation,
1510                                      loc.extLocation, &ident)) &&
1511                ident == TAG_IDENT_LVID) {
1512                 sbi->s_lvid_bh = bh;
1513                 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1514
1515                 if (lvid->nextIntegrityExt.extLength)
1516                         udf_load_logicalvolint(sb,
1517                                 leea_to_cpu(lvid->nextIntegrityExt));
1518
1519                 if (sbi->s_lvid_bh != bh)
1520                         brelse(bh);
1521                 loc.extLength -= sb->s_blocksize;
1522                 loc.extLocation++;
1523         }
1524         if (sbi->s_lvid_bh != bh)
1525                 brelse(bh);
1526 }
1527
1528 /*
1529  * Process a main/reserve volume descriptor sequence.
1530  *   @block             First block of first extent of the sequence.
1531  *   @lastblock         Lastblock of first extent of the sequence.
1532  *   @fileset           There we store extent containing root fileset
1533  *
1534  * Returns <0 on error, 0 on success. -EAGAIN is special - try next descriptor
1535  * sequence
1536  */
1537 static noinline int udf_process_sequence(
1538                 struct super_block *sb,
1539                 sector_t block, sector_t lastblock,
1540                 struct kernel_lb_addr *fileset)
1541 {
1542         struct buffer_head *bh = NULL;
1543         struct udf_vds_record vds[VDS_POS_LENGTH];
1544         struct udf_vds_record *curr;
1545         struct generic_desc *gd;
1546         struct volDescPtr *vdp;
1547         int done = 0;
1548         uint32_t vdsn;
1549         uint16_t ident;
1550         long next_s = 0, next_e = 0;
1551         int ret;
1552
1553         memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1554
1555         /*
1556          * Read the main descriptor sequence and find which descriptors
1557          * are in it.
1558          */
1559         for (; (!done && block <= lastblock); block++) {
1560
1561                 bh = udf_read_tagged(sb, block, block, &ident);
1562                 if (!bh) {
1563                         udf_err(sb,
1564                                 "Block %llu of volume descriptor sequence is corrupted or we could not read it\n",
1565                                 (unsigned long long)block);
1566                         return -EAGAIN;
1567                 }
1568
1569                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1570                 gd = (struct generic_desc *)bh->b_data;
1571                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1572                 switch (ident) {
1573                 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1574                         curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1575                         if (vdsn >= curr->volDescSeqNum) {
1576                                 curr->volDescSeqNum = vdsn;
1577                                 curr->block = block;
1578                         }
1579                         break;
1580                 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1581                         curr = &vds[VDS_POS_VOL_DESC_PTR];
1582                         if (vdsn >= curr->volDescSeqNum) {
1583                                 curr->volDescSeqNum = vdsn;
1584                                 curr->block = block;
1585
1586                                 vdp = (struct volDescPtr *)bh->b_data;
1587                                 next_s = le32_to_cpu(
1588                                         vdp->nextVolDescSeqExt.extLocation);
1589                                 next_e = le32_to_cpu(
1590                                         vdp->nextVolDescSeqExt.extLength);
1591                                 next_e = next_e >> sb->s_blocksize_bits;
1592                                 next_e += next_s;
1593                         }
1594                         break;
1595                 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1596                         curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1597                         if (vdsn >= curr->volDescSeqNum) {
1598                                 curr->volDescSeqNum = vdsn;
1599                                 curr->block = block;
1600                         }
1601                         break;
1602                 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1603                         curr = &vds[VDS_POS_PARTITION_DESC];
1604                         if (!curr->block)
1605                                 curr->block = block;
1606                         break;
1607                 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1608                         curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1609                         if (vdsn >= curr->volDescSeqNum) {
1610                                 curr->volDescSeqNum = vdsn;
1611                                 curr->block = block;
1612                         }
1613                         break;
1614                 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1615                         curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1616                         if (vdsn >= curr->volDescSeqNum) {
1617                                 curr->volDescSeqNum = vdsn;
1618                                 curr->block = block;
1619                         }
1620                         break;
1621                 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1622                         vds[VDS_POS_TERMINATING_DESC].block = block;
1623                         if (next_e) {
1624                                 block = next_s;
1625                                 lastblock = next_e;
1626                                 next_s = next_e = 0;
1627                         } else
1628                                 done = 1;
1629                         break;
1630                 }
1631                 brelse(bh);
1632         }
1633         /*
1634          * Now read interesting descriptors again and process them
1635          * in a suitable order
1636          */
1637         if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1638                 udf_err(sb, "Primary Volume Descriptor not found!\n");
1639                 return -EAGAIN;
1640         }
1641         ret = udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block);
1642         if (ret < 0)
1643                 return ret;
1644
1645         if (vds[VDS_POS_LOGICAL_VOL_DESC].block) {
1646                 ret = udf_load_logicalvol(sb,
1647                                           vds[VDS_POS_LOGICAL_VOL_DESC].block,
1648                                           fileset);
1649                 if (ret < 0)
1650                         return ret;
1651         }
1652
1653         if (vds[VDS_POS_PARTITION_DESC].block) {
1654                 /*
1655                  * We rescan the whole descriptor sequence to find
1656                  * partition descriptor blocks and process them.
1657                  */
1658                 for (block = vds[VDS_POS_PARTITION_DESC].block;
1659                      block < vds[VDS_POS_TERMINATING_DESC].block;
1660                      block++) {
1661                         ret = udf_load_partdesc(sb, block);
1662                         if (ret < 0)
1663                                 return ret;
1664                 }
1665         }
1666
1667         return 0;
1668 }
1669
1670 /*
1671  * Load Volume Descriptor Sequence described by anchor in bh
1672  *
1673  * Returns <0 on error, 0 on success
1674  */
1675 static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh,
1676                              struct kernel_lb_addr *fileset)
1677 {
1678         struct anchorVolDescPtr *anchor;
1679         sector_t main_s, main_e, reserve_s, reserve_e;
1680         int ret;
1681
1682         anchor = (struct anchorVolDescPtr *)bh->b_data;
1683
1684         /* Locate the main sequence */
1685         main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1686         main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1687         main_e = main_e >> sb->s_blocksize_bits;
1688         main_e += main_s;
1689
1690         /* Locate the reserve sequence */
1691         reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1692         reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1693         reserve_e = reserve_e >> sb->s_blocksize_bits;
1694         reserve_e += reserve_s;
1695
1696         /* Process the main & reserve sequences */
1697         /* responsible for finding the PartitionDesc(s) */
1698         ret = udf_process_sequence(sb, main_s, main_e, fileset);
1699         if (ret != -EAGAIN)
1700                 return ret;
1701         udf_sb_free_partitions(sb);
1702         ret = udf_process_sequence(sb, reserve_s, reserve_e, fileset);
1703         if (ret < 0) {
1704                 udf_sb_free_partitions(sb);
1705                 /* No sequence was OK, return -EIO */
1706                 if (ret == -EAGAIN)
1707                         ret = -EIO;
1708         }
1709         return ret;
1710 }
1711
1712 /*
1713  * Check whether there is an anchor block in the given block and
1714  * load Volume Descriptor Sequence if so.
1715  *
1716  * Returns <0 on error, 0 on success, -EAGAIN is special - try next anchor
1717  * block
1718  */
1719 static int udf_check_anchor_block(struct super_block *sb, sector_t block,
1720                                   struct kernel_lb_addr *fileset)
1721 {
1722         struct buffer_head *bh;
1723         uint16_t ident;
1724         int ret;
1725
1726         if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
1727             udf_fixed_to_variable(block) >=
1728             sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits)
1729                 return -EAGAIN;
1730
1731         bh = udf_read_tagged(sb, block, block, &ident);
1732         if (!bh)
1733                 return -EAGAIN;
1734         if (ident != TAG_IDENT_AVDP) {
1735                 brelse(bh);
1736                 return -EAGAIN;
1737         }
1738         ret = udf_load_sequence(sb, bh, fileset);
1739         brelse(bh);
1740         return ret;
1741 }
1742
1743 /*
1744  * Search for an anchor volume descriptor pointer.
1745  *
1746  * Returns < 0 on error, 0 on success. -EAGAIN is special - try next set
1747  * of anchors.
1748  */
1749 static int udf_scan_anchors(struct super_block *sb, sector_t *lastblock,
1750                             struct kernel_lb_addr *fileset)
1751 {
1752         sector_t last[6];
1753         int i;
1754         struct udf_sb_info *sbi = UDF_SB(sb);
1755         int last_count = 0;
1756         int ret;
1757
1758         /* First try user provided anchor */
1759         if (sbi->s_anchor) {
1760                 ret = udf_check_anchor_block(sb, sbi->s_anchor, fileset);
1761                 if (ret != -EAGAIN)
1762                         return ret;
1763         }
1764         /*
1765          * according to spec, anchor is in either:
1766          *     block 256
1767          *     lastblock-256
1768          *     lastblock
1769          *  however, if the disc isn't closed, it could be 512.
1770          */
1771         ret = udf_check_anchor_block(sb, sbi->s_session + 256, fileset);
1772         if (ret != -EAGAIN)
1773                 return ret;
1774         /*
1775          * The trouble is which block is the last one. Drives often misreport
1776          * this so we try various possibilities.
1777          */
1778         last[last_count++] = *lastblock;
1779         if (*lastblock >= 1)
1780                 last[last_count++] = *lastblock - 1;
1781         last[last_count++] = *lastblock + 1;
1782         if (*lastblock >= 2)
1783                 last[last_count++] = *lastblock - 2;
1784         if (*lastblock >= 150)
1785                 last[last_count++] = *lastblock - 150;
1786         if (*lastblock >= 152)
1787                 last[last_count++] = *lastblock - 152;
1788
1789         for (i = 0; i < last_count; i++) {
1790                 if (last[i] >= sb->s_bdev->bd_inode->i_size >>
1791                                 sb->s_blocksize_bits)
1792                         continue;
1793                 ret = udf_check_anchor_block(sb, last[i], fileset);
1794                 if (ret != -EAGAIN) {
1795                         if (!ret)
1796                                 *lastblock = last[i];
1797                         return ret;
1798                 }
1799                 if (last[i] < 256)
1800                         continue;
1801                 ret = udf_check_anchor_block(sb, last[i] - 256, fileset);
1802                 if (ret != -EAGAIN) {
1803                         if (!ret)
1804                                 *lastblock = last[i];
1805                         return ret;
1806                 }
1807         }
1808
1809         /* Finally try block 512 in case media is open */
1810         return udf_check_anchor_block(sb, sbi->s_session + 512, fileset);
1811 }
1812
1813 /*
1814  * Find an anchor volume descriptor and load Volume Descriptor Sequence from
1815  * area specified by it. The function expects sbi->s_lastblock to be the last
1816  * block on the media.
1817  *
1818  * Return <0 on error, 0 if anchor found. -EAGAIN is special meaning anchor
1819  * was not found.
1820  */
1821 static int udf_find_anchor(struct super_block *sb,
1822                            struct kernel_lb_addr *fileset)
1823 {
1824         struct udf_sb_info *sbi = UDF_SB(sb);
1825         sector_t lastblock = sbi->s_last_block;
1826         int ret;
1827
1828         ret = udf_scan_anchors(sb, &lastblock, fileset);
1829         if (ret != -EAGAIN)
1830                 goto out;
1831
1832         /* No anchor found? Try VARCONV conversion of block numbers */
1833         UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
1834         lastblock = udf_variable_to_fixed(sbi->s_last_block);
1835         /* Firstly, we try to not convert number of the last block */
1836         ret = udf_scan_anchors(sb, &lastblock, fileset);
1837         if (ret != -EAGAIN)
1838                 goto out;
1839
1840         lastblock = sbi->s_last_block;
1841         /* Secondly, we try with converted number of the last block */
1842         ret = udf_scan_anchors(sb, &lastblock, fileset);
1843         if (ret < 0) {
1844                 /* VARCONV didn't help. Clear it. */
1845                 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
1846         }
1847 out:
1848         if (ret == 0)
1849                 sbi->s_last_block = lastblock;
1850         return ret;
1851 }
1852
1853 /*
1854  * Check Volume Structure Descriptor, find Anchor block and load Volume
1855  * Descriptor Sequence.
1856  *
1857  * Returns < 0 on error, 0 on success. -EAGAIN is special meaning anchor
1858  * block was not found.
1859  */
1860 static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
1861                         int silent, struct kernel_lb_addr *fileset)
1862 {
1863         struct udf_sb_info *sbi = UDF_SB(sb);
1864         loff_t nsr_off;
1865         int ret;
1866
1867         if (!sb_set_blocksize(sb, uopt->blocksize)) {
1868                 if (!silent)
1869                         udf_warn(sb, "Bad block size\n");
1870                 return -EINVAL;
1871         }
1872         sbi->s_last_block = uopt->lastblock;
1873         if (!uopt->novrs) {
1874                 /* Check that it is NSR02 compliant */
1875                 nsr_off = udf_check_vsd(sb);
1876                 if (!nsr_off) {
1877                         if (!silent)
1878                                 udf_warn(sb, "No VRS found\n");
1879                         return 0;
1880                 }
1881                 if (nsr_off == -1)
1882                         udf_debug("Failed to read byte 32768. Assuming open disc. Skipping validity check\n");
1883                 if (!sbi->s_last_block)
1884                         sbi->s_last_block = udf_get_last_block(sb);
1885         } else {
1886                 udf_debug("Validity check skipped because of novrs option\n");
1887         }
1888
1889         /* Look for anchor block and load Volume Descriptor Sequence */
1890         sbi->s_anchor = uopt->anchor;
1891         ret = udf_find_anchor(sb, fileset);
1892         if (ret < 0) {
1893                 if (!silent && ret == -EAGAIN)
1894                         udf_warn(sb, "No anchor found\n");
1895                 return ret;
1896         }
1897         return 0;
1898 }
1899
1900 static void udf_open_lvid(struct super_block *sb)
1901 {
1902         struct udf_sb_info *sbi = UDF_SB(sb);
1903         struct buffer_head *bh = sbi->s_lvid_bh;
1904         struct logicalVolIntegrityDesc *lvid;
1905         struct logicalVolIntegrityDescImpUse *lvidiu;
1906
1907         if (!bh)
1908                 return;
1909
1910         mutex_lock(&sbi->s_alloc_mutex);
1911         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1912         lvidiu = udf_sb_lvidiu(sbi);
1913
1914         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1915         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1916         udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
1917                                 CURRENT_TIME);
1918         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN);
1919
1920         lvid->descTag.descCRC = cpu_to_le16(
1921                 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1922                         le16_to_cpu(lvid->descTag.descCRCLength)));
1923
1924         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1925         mark_buffer_dirty(bh);
1926         sbi->s_lvid_dirty = 0;
1927         mutex_unlock(&sbi->s_alloc_mutex);
1928         /* Make opening of filesystem visible on the media immediately */
1929         sync_dirty_buffer(bh);
1930 }
1931
1932 static void udf_close_lvid(struct super_block *sb)
1933 {
1934         struct udf_sb_info *sbi = UDF_SB(sb);
1935         struct buffer_head *bh = sbi->s_lvid_bh;
1936         struct logicalVolIntegrityDesc *lvid;
1937         struct logicalVolIntegrityDescImpUse *lvidiu;
1938
1939         if (!bh)
1940                 return;
1941
1942         mutex_lock(&sbi->s_alloc_mutex);
1943         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1944         lvidiu = udf_sb_lvidiu(sbi);
1945         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1946         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1947         udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
1948         if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1949                 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1950         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1951                 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1952         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
1953                 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
1954         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1955
1956         lvid->descTag.descCRC = cpu_to_le16(
1957                         crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1958                                 le16_to_cpu(lvid->descTag.descCRCLength)));
1959
1960         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1961         /*
1962          * We set buffer uptodate unconditionally here to avoid spurious
1963          * warnings from mark_buffer_dirty() when previous EIO has marked
1964          * the buffer as !uptodate
1965          */
1966         set_buffer_uptodate(bh);
1967         mark_buffer_dirty(bh);
1968         sbi->s_lvid_dirty = 0;
1969         mutex_unlock(&sbi->s_alloc_mutex);
1970         /* Make closing of filesystem visible on the media immediately */
1971         sync_dirty_buffer(bh);
1972 }
1973
1974 u64 lvid_get_unique_id(struct super_block *sb)
1975 {
1976         struct buffer_head *bh;
1977         struct udf_sb_info *sbi = UDF_SB(sb);
1978         struct logicalVolIntegrityDesc *lvid;
1979         struct logicalVolHeaderDesc *lvhd;
1980         u64 uniqueID;
1981         u64 ret;
1982
1983         bh = sbi->s_lvid_bh;
1984         if (!bh)
1985                 return 0;
1986
1987         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1988         lvhd = (struct logicalVolHeaderDesc *)lvid->logicalVolContentsUse;
1989
1990         mutex_lock(&sbi->s_alloc_mutex);
1991         ret = uniqueID = le64_to_cpu(lvhd->uniqueID);
1992         if (!(++uniqueID & 0xFFFFFFFF))
1993                 uniqueID += 16;
1994         lvhd->uniqueID = cpu_to_le64(uniqueID);
1995         mutex_unlock(&sbi->s_alloc_mutex);
1996         mark_buffer_dirty(bh);
1997
1998         return ret;
1999 }
2000
2001 static int udf_fill_super(struct super_block *sb, void *options, int silent)
2002 {
2003         int ret = -EINVAL;
2004         struct inode *inode = NULL;
2005         struct udf_options uopt;
2006         struct kernel_lb_addr rootdir, fileset;
2007         struct udf_sb_info *sbi;
2008
2009         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
2010         uopt.uid = INVALID_UID;
2011         uopt.gid = INVALID_GID;
2012         uopt.umask = 0;
2013         uopt.fmode = UDF_INVALID_MODE;
2014         uopt.dmode = UDF_INVALID_MODE;
2015
2016         sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
2017         if (!sbi)
2018                 return -ENOMEM;
2019
2020         sb->s_fs_info = sbi;
2021
2022         mutex_init(&sbi->s_alloc_mutex);
2023
2024         if (!udf_parse_options((char *)options, &uopt, false))
2025                 goto error_out;
2026
2027         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
2028             uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
2029                 udf_err(sb, "utf8 cannot be combined with iocharset\n");
2030                 goto error_out;
2031         }
2032 #ifdef CONFIG_UDF_NLS
2033         if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
2034                 uopt.nls_map = load_nls_default();
2035                 if (!uopt.nls_map)
2036                         uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
2037                 else
2038                         udf_debug("Using default NLS map\n");
2039         }
2040 #endif
2041         if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
2042                 uopt.flags |= (1 << UDF_FLAG_UTF8);
2043
2044         fileset.logicalBlockNum = 0xFFFFFFFF;
2045         fileset.partitionReferenceNum = 0xFFFF;
2046
2047         sbi->s_flags = uopt.flags;
2048         sbi->s_uid = uopt.uid;
2049         sbi->s_gid = uopt.gid;
2050         sbi->s_umask = uopt.umask;
2051         sbi->s_fmode = uopt.fmode;
2052         sbi->s_dmode = uopt.dmode;
2053         sbi->s_nls_map = uopt.nls_map;
2054         rwlock_init(&sbi->s_cred_lock);
2055
2056         if (uopt.session == 0xFFFFFFFF)
2057                 sbi->s_session = udf_get_last_session(sb);
2058         else
2059                 sbi->s_session = uopt.session;
2060
2061         udf_debug("Multi-session=%d\n", sbi->s_session);
2062
2063         /* Fill in the rest of the superblock */
2064         sb->s_op = &udf_sb_ops;
2065         sb->s_export_op = &udf_export_ops;
2066
2067         sb->s_magic = UDF_SUPER_MAGIC;
2068         sb->s_time_gran = 1000;
2069
2070         if (uopt.flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) {
2071                 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
2072         } else {
2073                 uopt.blocksize = bdev_logical_block_size(sb->s_bdev);
2074                 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
2075                 if (ret == -EAGAIN && uopt.blocksize != UDF_DEFAULT_BLOCKSIZE) {
2076                         if (!silent)
2077                                 pr_notice("Rescanning with blocksize %d\n",
2078                                           UDF_DEFAULT_BLOCKSIZE);
2079                         brelse(sbi->s_lvid_bh);
2080                         sbi->s_lvid_bh = NULL;
2081                         uopt.blocksize = UDF_DEFAULT_BLOCKSIZE;
2082                         ret = udf_load_vrs(sb, &uopt, silent, &fileset);
2083                 }
2084         }
2085         if (ret < 0) {
2086                 if (ret == -EAGAIN) {
2087                         udf_warn(sb, "No partition found (1)\n");
2088                         ret = -EINVAL;
2089                 }
2090                 goto error_out;
2091         }
2092
2093         udf_debug("Lastblock=%d\n", sbi->s_last_block);
2094
2095         if (sbi->s_lvid_bh) {
2096                 struct logicalVolIntegrityDescImpUse *lvidiu =
2097                                                         udf_sb_lvidiu(sbi);
2098                 uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
2099                 uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
2100                 /* uint16_t maxUDFWriteRev =
2101                                 le16_to_cpu(lvidiu->maxUDFWriteRev); */
2102
2103                 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
2104                         udf_err(sb, "minUDFReadRev=%x (max is %x)\n",
2105                                 le16_to_cpu(lvidiu->minUDFReadRev),
2106                                 UDF_MAX_READ_VERSION);
2107                         ret = -EINVAL;
2108                         goto error_out;
2109                 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION &&
2110                            !(sb->s_flags & MS_RDONLY)) {
2111                         ret = -EACCES;
2112                         goto error_out;
2113                 }
2114
2115                 sbi->s_udfrev = minUDFWriteRev;
2116
2117                 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
2118                         UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
2119                 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
2120                         UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
2121         }
2122
2123         if (!sbi->s_partitions) {
2124                 udf_warn(sb, "No partition found (2)\n");
2125                 ret = -EINVAL;
2126                 goto error_out;
2127         }
2128
2129         if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
2130                         UDF_PART_FLAG_READ_ONLY &&
2131             !(sb->s_flags & MS_RDONLY)) {
2132                 ret = -EACCES;
2133                 goto error_out;
2134         }
2135
2136         if (udf_find_fileset(sb, &fileset, &rootdir)) {
2137                 udf_warn(sb, "No fileset found\n");
2138                 ret = -EINVAL;
2139                 goto error_out;
2140         }
2141
2142         if (!silent) {
2143                 struct timestamp ts;
2144                 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
2145                 udf_info("Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
2146                          sbi->s_volume_ident,
2147                          le16_to_cpu(ts.year), ts.month, ts.day,
2148                          ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
2149         }
2150         if (!(sb->s_flags & MS_RDONLY))
2151                 udf_open_lvid(sb);
2152
2153         /* Assign the root inode */
2154         /* assign inodes by physical block number */
2155         /* perhaps it's not extensible enough, but for now ... */
2156         inode = udf_iget(sb, &rootdir);
2157         if (!inode) {
2158                 udf_err(sb, "Error in udf_iget, block=%d, partition=%d\n",
2159                        rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
2160                 ret = -EIO;
2161                 goto error_out;
2162         }
2163
2164         /* Allocate a dentry for the root inode */
2165         sb->s_root = d_make_root(inode);
2166         if (!sb->s_root) {
2167                 udf_err(sb, "Couldn't allocate root dentry\n");
2168                 ret = -ENOMEM;
2169                 goto error_out;
2170         }
2171         sb->s_maxbytes = MAX_LFS_FILESIZE;
2172         sb->s_max_links = UDF_MAX_LINKS;
2173         return 0;
2174
2175 error_out:
2176         if (sbi->s_vat_inode)
2177                 iput(sbi->s_vat_inode);
2178 #ifdef CONFIG_UDF_NLS
2179         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2180                 unload_nls(sbi->s_nls_map);
2181 #endif
2182         if (!(sb->s_flags & MS_RDONLY))
2183                 udf_close_lvid(sb);
2184         brelse(sbi->s_lvid_bh);
2185         udf_sb_free_partitions(sb);
2186         kfree(sbi);
2187         sb->s_fs_info = NULL;
2188
2189         return ret;
2190 }
2191
2192 void _udf_err(struct super_block *sb, const char *function,
2193               const char *fmt, ...)
2194 {
2195         struct va_format vaf;
2196         va_list args;
2197
2198         va_start(args, fmt);
2199
2200         vaf.fmt = fmt;
2201         vaf.va = &args;
2202
2203         pr_err("error (device %s): %s: %pV", sb->s_id, function, &vaf);
2204
2205         va_end(args);
2206 }
2207
2208 void _udf_warn(struct super_block *sb, const char *function,
2209                const char *fmt, ...)
2210 {
2211         struct va_format vaf;
2212         va_list args;
2213
2214         va_start(args, fmt);
2215
2216         vaf.fmt = fmt;
2217         vaf.va = &args;
2218
2219         pr_warn("warning (device %s): %s: %pV", sb->s_id, function, &vaf);
2220
2221         va_end(args);
2222 }
2223
2224 static void udf_put_super(struct super_block *sb)
2225 {
2226         struct udf_sb_info *sbi;
2227
2228         sbi = UDF_SB(sb);
2229
2230         if (sbi->s_vat_inode)
2231                 iput(sbi->s_vat_inode);
2232 #ifdef CONFIG_UDF_NLS
2233         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2234                 unload_nls(sbi->s_nls_map);
2235 #endif
2236         if (!(sb->s_flags & MS_RDONLY))
2237                 udf_close_lvid(sb);
2238         brelse(sbi->s_lvid_bh);
2239         udf_sb_free_partitions(sb);
2240         kfree(sb->s_fs_info);
2241         sb->s_fs_info = NULL;
2242 }
2243
2244 static int udf_sync_fs(struct super_block *sb, int wait)
2245 {
2246         struct udf_sb_info *sbi = UDF_SB(sb);
2247
2248         mutex_lock(&sbi->s_alloc_mutex);
2249         if (sbi->s_lvid_dirty) {
2250                 /*
2251                  * Blockdevice will be synced later so we don't have to submit
2252                  * the buffer for IO
2253                  */
2254                 mark_buffer_dirty(sbi->s_lvid_bh);
2255                 sbi->s_lvid_dirty = 0;
2256         }
2257         mutex_unlock(&sbi->s_alloc_mutex);
2258
2259         return 0;
2260 }
2261
2262 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
2263 {
2264         struct super_block *sb = dentry->d_sb;
2265         struct udf_sb_info *sbi = UDF_SB(sb);
2266         struct logicalVolIntegrityDescImpUse *lvidiu;
2267         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
2268
2269         if (sbi->s_lvid_bh != NULL)
2270                 lvidiu = udf_sb_lvidiu(sbi);
2271         else
2272                 lvidiu = NULL;
2273
2274         buf->f_type = UDF_SUPER_MAGIC;
2275         buf->f_bsize = sb->s_blocksize;
2276         buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
2277         buf->f_bfree = udf_count_free(sb);
2278         buf->f_bavail = buf->f_bfree;
2279         buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2280                                           le32_to_cpu(lvidiu->numDirs)) : 0)
2281                         + buf->f_bfree;
2282         buf->f_ffree = buf->f_bfree;
2283         buf->f_namelen = UDF_NAME_LEN - 2;
2284         buf->f_fsid.val[0] = (u32)id;
2285         buf->f_fsid.val[1] = (u32)(id >> 32);
2286
2287         return 0;
2288 }
2289
2290 static unsigned int udf_count_free_bitmap(struct super_block *sb,
2291                                           struct udf_bitmap *bitmap)
2292 {
2293         struct buffer_head *bh = NULL;
2294         unsigned int accum = 0;
2295         int index;
2296         int block = 0, newblock;
2297         struct kernel_lb_addr loc;
2298         uint32_t bytes;
2299         uint8_t *ptr;
2300         uint16_t ident;
2301         struct spaceBitmapDesc *bm;
2302
2303         loc.logicalBlockNum = bitmap->s_extPosition;
2304         loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
2305         bh = udf_read_ptagged(sb, &loc, 0, &ident);
2306
2307         if (!bh) {
2308                 udf_err(sb, "udf_count_free failed\n");
2309                 goto out;
2310         } else if (ident != TAG_IDENT_SBD) {
2311                 brelse(bh);
2312                 udf_err(sb, "udf_count_free failed\n");
2313                 goto out;
2314         }
2315
2316         bm = (struct spaceBitmapDesc *)bh->b_data;
2317         bytes = le32_to_cpu(bm->numOfBytes);
2318         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2319         ptr = (uint8_t *)bh->b_data;
2320
2321         while (bytes > 0) {
2322                 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2323                 accum += bitmap_weight((const unsigned long *)(ptr + index),
2324                                         cur_bytes * 8);
2325                 bytes -= cur_bytes;
2326                 if (bytes) {
2327                         brelse(bh);
2328                         newblock = udf_get_lb_pblock(sb, &loc, ++block);
2329                         bh = udf_tread(sb, newblock);
2330                         if (!bh) {
2331                                 udf_debug("read failed\n");
2332                                 goto out;
2333                         }
2334                         index = 0;
2335                         ptr = (uint8_t *)bh->b_data;
2336                 }
2337         }
2338         brelse(bh);
2339 out:
2340         return accum;
2341 }
2342
2343 static unsigned int udf_count_free_table(struct super_block *sb,
2344                                          struct inode *table)
2345 {
2346         unsigned int accum = 0;
2347         uint32_t elen;
2348         struct kernel_lb_addr eloc;
2349         int8_t etype;
2350         struct extent_position epos;
2351
2352         mutex_lock(&UDF_SB(sb)->s_alloc_mutex);
2353         epos.block = UDF_I(table)->i_location;
2354         epos.offset = sizeof(struct unallocSpaceEntry);
2355         epos.bh = NULL;
2356
2357         while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2358                 accum += (elen >> table->i_sb->s_blocksize_bits);
2359
2360         brelse(epos.bh);
2361         mutex_unlock(&UDF_SB(sb)->s_alloc_mutex);
2362
2363         return accum;
2364 }
2365
2366 static unsigned int udf_count_free(struct super_block *sb)
2367 {
2368         unsigned int accum = 0;
2369         struct udf_sb_info *sbi;
2370         struct udf_part_map *map;
2371
2372         sbi = UDF_SB(sb);
2373         if (sbi->s_lvid_bh) {
2374                 struct logicalVolIntegrityDesc *lvid =
2375                         (struct logicalVolIntegrityDesc *)
2376                         sbi->s_lvid_bh->b_data;
2377                 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
2378                         accum = le32_to_cpu(
2379                                         lvid->freeSpaceTable[sbi->s_partition]);
2380                         if (accum == 0xFFFFFFFF)
2381                                 accum = 0;
2382                 }
2383         }
2384
2385         if (accum)
2386                 return accum;
2387
2388         map = &sbi->s_partmaps[sbi->s_partition];
2389         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2390                 accum += udf_count_free_bitmap(sb,
2391                                                map->s_uspace.s_bitmap);
2392         }
2393         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
2394                 accum += udf_count_free_bitmap(sb,
2395                                                map->s_fspace.s_bitmap);
2396         }
2397         if (accum)
2398                 return accum;
2399
2400         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2401                 accum += udf_count_free_table(sb,
2402                                               map->s_uspace.s_table);
2403         }
2404         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
2405                 accum += udf_count_free_table(sb,
2406                                               map->s_fspace.s_table);
2407         }
2408
2409         return accum;
2410 }