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/vfs.h>
  52 #include <linux/vmalloc.h>
  53 #include <linux/errno.h>
  54 #include <linux/mount.h>
  55 #include <linux/seq_file.h>
  56 #include <linux/bitmap.h>
  57 #include <linux/crc-itu-t.h>
  58 #include <linux/log2.h>
  59 #include <asm/byteorder.h>
  60
  61 #include "udf_sb.h"
  62 #include "udf_i.h"
  63
  64 #include <linux/init.h>
  65 #include <linux/uaccess.h>
  66
  67 enum {
  68         VDS_POS_PRIMARY_VOL_DESC,
  69         VDS_POS_UNALLOC_SPACE_DESC,
  70         VDS_POS_LOGICAL_VOL_DESC,
  71         VDS_POS_IMP_USE_VOL_DESC,
  72         VDS_POS_LENGTH
  73 };
  74
  75 #define VSD_FIRST_SECTOR_OFFSET         32768
  76 #define VSD_MAX_SECTOR_OFFSET           0x800000
  77
  78 /*
  79  * Maximum number of Terminating Descriptor / Logical Volume Integrity
  80  * Descriptor redirections. The chosen numbers are arbitrary - just that we
  81  * hopefully don't limit any real use of rewritten inode on write-once media
  82  * but avoid looping for too long on corrupted media.
  83  */
  84 #define UDF_MAX_TD_NESTING 64
  85 #define UDF_MAX_LVID_NESTING 1000
  86
  87 enum { UDF_MAX_LINKS = 0xffff };
  88
  89 /* These are the "meat" - everything else is stuffing */
  90 static int udf_fill_super(struct super_block *, void *, int);
  91 static void udf_put_super(struct super_block *);
  92 static int udf_sync_fs(struct super_block *, int);
  93 static int udf_remount_fs(struct super_block *, int *, char *);
  94 static void udf_load_logicalvolint(struct super_block *, struct kernel_extent_ad);
  95 static int udf_find_fileset(struct super_block *, struct kernel_lb_addr *,
  96                             struct kernel_lb_addr *);
  97 static void udf_load_fileset(struct super_block *, struct buffer_head *,
  98                              struct kernel_lb_addr *);
  99 static void udf_open_lvid(struct super_block *);
 100 static void udf_close_lvid(struct super_block *);
 101 static unsigned int udf_count_free(struct super_block *);
 102 static int udf_statfs(struct dentry *, struct kstatfs *);
 103 static int udf_show_options(struct seq_file *, struct dentry *);
 104
 105 struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct super_block *sb)
 106 {
 107         struct logicalVolIntegrityDesc *lvid;
 108         unsigned int partnum;
 109         unsigned int offset;
 110
 111         if (!UDF_SB(sb)->s_lvid_bh)
 112                 return NULL;
 113         lvid = (struct logicalVolIntegrityDesc *)UDF_SB(sb)->s_lvid_bh->b_data;
 114         partnum = le32_to_cpu(lvid->numOfPartitions);
 115         if ((sb->s_blocksize - sizeof(struct logicalVolIntegrityDescImpUse) -
 116              offsetof(struct logicalVolIntegrityDesc, impUse)) /
 117              (2 * sizeof(uint32_t)) < partnum) {
 118                 udf_err(sb, "Logical volume integrity descriptor corrupted "
 119                         "(numOfPartitions = %u)!\n", partnum);
 120                 return NULL;
 121         }
 122         /* The offset is to skip freeSpaceTable and sizeTable arrays */
 123         offset = partnum * 2 * sizeof(uint32_t);
 124         return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
 125 }
 126
 127 /* UDF filesystem type */
 128 static struct dentry *udf_mount(struct file_system_type *fs_type,
 129                       int flags, const char *dev_name, void *data)
 130 {
 131         return mount_bdev(fs_type, flags, dev_name, data, udf_fill_super);
 132 }
 133
 134 static struct file_system_type udf_fstype = {
 135         .owner          = THIS_MODULE,
 136         .name           = "udf",
 137         .mount          = udf_mount,
 138         .kill_sb        = kill_block_super,
 139         .fs_flags       = FS_REQUIRES_DEV,
 140 };
 141 MODULE_ALIAS_FS("udf");
 142
 143 static struct kmem_cache *udf_inode_cachep;
 144
 145 static struct inode *udf_alloc_inode(struct super_block *sb)
 146 {
 147         struct udf_inode_info *ei;
 148         ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
 149         if (!ei)
 150                 return NULL;
 151
 152         ei->i_unique = 0;
 153         ei->i_lenExtents = 0;
 154         ei->i_next_alloc_block = 0;
 155         ei->i_next_alloc_goal = 0;
 156         ei->i_strat4096 = 0;
 157         init_rwsem(&ei->i_data_sem);
 158         ei->cached_extent.lstart = -1;
 159         spin_lock_init(&ei->i_extent_cache_lock);
 160
 161         return &ei->vfs_inode;
 162 }
 163
 164 static void udf_i_callback(struct rcu_head *head)
 165 {
 166         struct inode *inode = container_of(head, struct inode, i_rcu);
 167         kmem_cache_free(udf_inode_cachep, UDF_I(inode));
 168 }
 169
 170 static void udf_destroy_inode(struct inode *inode)
 171 {
 172         call_rcu(&inode->i_rcu, udf_i_callback);
 173 }
 174
 175 static void init_once(void *foo)
 176 {
 177         struct udf_inode_info *ei = (struct udf_inode_info *)foo;
 178
 179         ei->i_ext.i_data = NULL;
 180         inode_init_once(&ei->vfs_inode);
 181 }
 182
 183 static int __init init_inodecache(void)
 184 {
 185         udf_inode_cachep = kmem_cache_create("udf_inode_cache",
 186                                              sizeof(struct udf_inode_info),
 187                                              0, (SLAB_RECLAIM_ACCOUNT |
 188                                                  SLAB_MEM_SPREAD |
 189                                                  SLAB_ACCOUNT),
 190                                              init_once);
 191         if (!udf_inode_cachep)
 192                 return -ENOMEM;
 193         return 0;
 194 }
 195
 196 static void destroy_inodecache(void)
 197 {
 198         /*
 199          * Make sure all delayed rcu free inodes are flushed before we
 200          * destroy cache.
 201          */
 202         rcu_barrier();
 203         kmem_cache_destroy(udf_inode_cachep);
 204 }
 205
 206 /* Superblock operations */
 207 static const struct super_operations udf_sb_ops = {
 208         .alloc_inode    = udf_alloc_inode,
 209         .destroy_inode  = udf_destroy_inode,
 210         .write_inode    = udf_write_inode,
 211         .evict_inode    = udf_evict_inode,
 212         .put_super      = udf_put_super,
 213         .sync_fs        = udf_sync_fs,
 214         .statfs         = udf_statfs,
 215         .remount_fs     = udf_remount_fs,
 216         .show_options   = udf_show_options,
 217 };
 218
 219 struct udf_options {
 220         unsigned char novrs;
 221         unsigned int blocksize;
 222         unsigned int session;
 223         unsigned int lastblock;
 224         unsigned int anchor;
 225         unsigned int flags;
 226         umode_t umask;
 227         kgid_t gid;
 228         kuid_t uid;
 229         umode_t fmode;
 230         umode_t dmode;
 231         struct nls_table *nls_map;
 232 };
 233
 234 static int __init init_udf_fs(void)
 235 {
 236         int err;
 237
 238         err = init_inodecache();
 239         if (err)
 240                 goto out1;
 241         err = register_filesystem(&udf_fstype);
 242         if (err)
 243                 goto out;
 244
 245         return 0;
 246
 247 out:
 248         destroy_inodecache();
 249
 250 out1:
 251         return err;
 252 }
 253
 254 static void __exit exit_udf_fs(void)
 255 {
 256         unregister_filesystem(&udf_fstype);
 257         destroy_inodecache();
 258 }
 259
 260 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
 261 {
 262         struct udf_sb_info *sbi = UDF_SB(sb);
 263
 264         sbi->s_partmaps = kcalloc(count, sizeof(*sbi->s_partmaps), GFP_KERNEL);
 265         if (!sbi->s_partmaps) {
 266                 sbi->s_partitions = 0;
 267                 return -ENOMEM;
 268         }
 269
 270         sbi->s_partitions = count;
 271         return 0;
 272 }
 273
 274 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
 275 {
 276         int i;
 277         int nr_groups = bitmap->s_nr_groups;
 278
 279         for (i = 0; i < nr_groups; i++)
 280                 if (bitmap->s_block_bitmap[i])
 281                         brelse(bitmap->s_block_bitmap[i]);
 282
 283         kvfree(bitmap);
 284 }
 285
 286 static void udf_free_partition(struct udf_part_map *map)
 287 {
 288         int i;
 289         struct udf_meta_data *mdata;
 290
 291         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
 292                 iput(map->s_uspace.s_table);
 293         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
 294                 iput(map->s_fspace.s_table);
 295         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
 296                 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
 297         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
 298                 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
 299         if (map->s_partition_type == UDF_SPARABLE_MAP15)
 300                 for (i = 0; i < 4; i++)
 301                         brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
 302         else if (map->s_partition_type == UDF_METADATA_MAP25) {
 303                 mdata = &map->s_type_specific.s_metadata;
 304                 iput(mdata->s_metadata_fe);
 305                 mdata->s_metadata_fe = NULL;
 306
 307                 iput(mdata->s_mirror_fe);
 308                 mdata->s_mirror_fe = NULL;
 309
 310                 iput(mdata->s_bitmap_fe);
 311                 mdata->s_bitmap_fe = NULL;
 312         }
 313 }
 314
 315 static void udf_sb_free_partitions(struct super_block *sb)
 316 {
 317         struct udf_sb_info *sbi = UDF_SB(sb);
 318         int i;
 319
 320         if (!sbi->s_partmaps)
 321                 return;
 322         for (i = 0; i < sbi->s_partitions; i++)
 323                 udf_free_partition(&sbi->s_partmaps[i]);
 324         kfree(sbi->s_partmaps);
 325         sbi->s_partmaps = NULL;
 326 }
 327
 328 static int udf_show_options(struct seq_file *seq, struct dentry *root)
 329 {
 330         struct super_block *sb = root->d_sb;
 331         struct udf_sb_info *sbi = UDF_SB(sb);
 332
 333         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
 334                 seq_puts(seq, ",nostrict");
 335         if (UDF_QUERY_FLAG(sb, UDF_FLAG_BLOCKSIZE_SET))
 336                 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
 337         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
 338                 seq_puts(seq, ",unhide");
 339         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
 340                 seq_puts(seq, ",undelete");
 341         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
 342                 seq_puts(seq, ",noadinicb");
 343         if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
 344                 seq_puts(seq, ",shortad");
 345         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
 346                 seq_puts(seq, ",uid=forget");
 347         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
 348                 seq_puts(seq, ",gid=forget");
 349         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
 350                 seq_printf(seq, ",uid=%u", from_kuid(&init_user_ns, sbi->s_uid));
 351         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
 352                 seq_printf(seq, ",gid=%u", from_kgid(&init_user_ns, sbi->s_gid));
 353         if (sbi->s_umask != 0)
 354                 seq_printf(seq, ",umask=%ho", sbi->s_umask);
 355         if (sbi->s_fmode != UDF_INVALID_MODE)
 356                 seq_printf(seq, ",mode=%ho", sbi->s_fmode);
 357         if (sbi->s_dmode != UDF_INVALID_MODE)
 358                 seq_printf(seq, ",dmode=%ho", sbi->s_dmode);
 359         if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
 360                 seq_printf(seq, ",session=%d", sbi->s_session);
 361         if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
 362                 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
 363         if (sbi->s_anchor != 0)
 364                 seq_printf(seq, ",anchor=%u", sbi->s_anchor);
 365         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
 366                 seq_puts(seq, ",utf8");
 367         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
 368                 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
 369
 370         return 0;
 371 }
 372
 373 /*
 374  * udf_parse_options
 375  *
 376  * PURPOSE
 377  *      Parse mount options.
 378  *
 379  * DESCRIPTION
 380  *      The following mount options are supported:
 381  *
 382  *      gid=            Set the default group.
 383  *      umask=          Set the default umask.
 384  *      mode=           Set the default file permissions.
 385  *      dmode=          Set the default directory permissions.
 386  *      uid=            Set the default user.
 387  *      bs=             Set the block size.
 388  *      unhide          Show otherwise hidden files.
 389  *      undelete        Show deleted files in lists.
 390  *      adinicb         Embed data in the inode (default)
 391  *      noadinicb       Don't embed data in the inode
 392  *      shortad         Use short ad's
 393  *      longad          Use long ad's (default)
 394  *      nostrict        Unset strict conformance
 395  *      iocharset=      Set the NLS character set
 396  *
 397  *      The remaining are for debugging and disaster recovery:
 398  *
 399  *      novrs           Skip volume sequence recognition
 400  *
 401  *      The following expect a offset from 0.
 402  *
 403  *      session=        Set the CDROM session (default= last session)
 404  *      anchor=         Override standard anchor location. (default= 256)
 405  *      volume=         Override the VolumeDesc location. (unused)
 406  *      partition=      Override the PartitionDesc location. (unused)
 407  *      lastblock=      Set the last block of the filesystem/
 408  *
 409  *      The following expect a offset from the partition root.
 410  *
 411  *      fileset=        Override the fileset block location. (unused)
 412  *      rootdir=        Override the root directory location. (unused)
 413  *              WARNING: overriding the rootdir to a non-directory may
 414  *              yield highly unpredictable results.
 415  *
 416  * PRE-CONDITIONS
 417  *      options         Pointer to mount options string.
 418  *      uopts           Pointer to mount options variable.
 419  *
 420  * POST-CONDITIONS
 421  *      <return>        1       Mount options parsed okay.
 422  *      <return>        0       Error parsing mount options.
 423  *
 424  * HISTORY
 425  *      July 1, 1997 - Andrew E. Mileski
 426  *      Written, tested, and released.
 427  */
 428
 429 enum {
 430         Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
 431         Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
 432         Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
 433         Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
 434         Opt_rootdir, Opt_utf8, Opt_iocharset,
 435         Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore,
 436         Opt_fmode, Opt_dmode
 437 };
 438
 439 static const match_table_t tokens = {
 440         {Opt_novrs,     "novrs"},
 441         {Opt_nostrict,  "nostrict"},
 442         {Opt_bs,        "bs=%u"},
 443         {Opt_unhide,    "unhide"},
 444         {Opt_undelete,  "undelete"},
 445         {Opt_noadinicb, "noadinicb"},
 446         {Opt_adinicb,   "adinicb"},
 447         {Opt_shortad,   "shortad"},
 448         {Opt_longad,    "longad"},
 449         {Opt_uforget,   "uid=forget"},
 450         {Opt_uignore,   "uid=ignore"},
 451         {Opt_gforget,   "gid=forget"},
 452         {Opt_gignore,   "gid=ignore"},
 453         {Opt_gid,       "gid=%u"},
 454         {Opt_uid,       "uid=%u"},
 455         {Opt_umask,     "umask=%o"},
 456         {Opt_session,   "session=%u"},
 457         {Opt_lastblock, "lastblock=%u"},
 458         {Opt_anchor,    "anchor=%u"},
 459         {Opt_volume,    "volume=%u"},
 460         {Opt_partition, "partition=%u"},
 461         {Opt_fileset,   "fileset=%u"},
 462         {Opt_rootdir,   "rootdir=%u"},
 463         {Opt_utf8,      "utf8"},
 464         {Opt_iocharset, "iocharset=%s"},
 465         {Opt_fmode,     "mode=%o"},
 466         {Opt_dmode,     "dmode=%o"},
 467         {Opt_err,       NULL}
 468 };
 469
 470 static int udf_parse_options(char *options, struct udf_options *uopt,
 471                              bool remount)
 472 {
 473         char *p;
 474         int option;
 475
 476         uopt->novrs = 0;
 477         uopt->session = 0xFFFFFFFF;
 478         uopt->lastblock = 0;
 479         uopt->anchor = 0;
 480
 481         if (!options)
 482                 return 1;
 483
 484         while ((p = strsep(&options, ",")) != NULL) {
 485                 substring_t args[MAX_OPT_ARGS];
 486                 int token;
 487                 unsigned n;
 488                 if (!*p)
 489                         continue;
 490
 491                 token = match_token(p, tokens, args);
 492                 switch (token) {
 493                 case Opt_novrs:
 494                         uopt->novrs = 1;
 495                         break;
 496                 case Opt_bs:
 497                         if (match_int(&args[0], &option))
 498                                 return 0;
 499                         n = option;
 500                         if (n != 512 && n != 1024 && n != 2048 && n != 4096)
 501                                 return 0;
 502                         uopt->blocksize = n;
 503                         uopt->flags |= (1 << UDF_FLAG_BLOCKSIZE_SET);
 504                         break;
 505                 case Opt_unhide:
 506                         uopt->flags |= (1 << UDF_FLAG_UNHIDE);
 507                         break;
 508                 case Opt_undelete:
 509                         uopt->flags |= (1 << UDF_FLAG_UNDELETE);
 510                         break;
 511                 case Opt_noadinicb:
 512                         uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
 513                         break;
 514                 case Opt_adinicb:
 515                         uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
 516                         break;
 517                 case Opt_shortad:
 518                         uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
 519                         break;
 520                 case Opt_longad:
 521                         uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
 522                         break;
 523                 case Opt_gid:
 524                         if (match_int(args, &option))
 525                                 return 0;
 526                         uopt->gid = make_kgid(current_user_ns(), option);
 527                         if (!gid_valid(uopt->gid))
 528                                 return 0;
 529                         uopt->flags |= (1 << UDF_FLAG_GID_SET);
 530                         break;
 531                 case Opt_uid:
 532                         if (match_int(args, &option))
 533                                 return 0;
 534                         uopt->uid = make_kuid(current_user_ns(), option);
 535                         if (!uid_valid(uopt->uid))
 536                                 return 0;
 537                         uopt->flags |= (1 << UDF_FLAG_UID_SET);
 538                         break;
 539                 case Opt_umask:
 540                         if (match_octal(args, &option))
 541                                 return 0;
 542                         uopt->umask = option;
 543                         break;
 544                 case Opt_nostrict:
 545                         uopt->flags &= ~(1 << UDF_FLAG_STRICT);
 546                         break;
 547                 case Opt_session:
 548                         if (match_int(args, &option))
 549                                 return 0;
 550                         uopt->session = option;
 551                         if (!remount)
 552                                 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
 553                         break;
 554                 case Opt_lastblock:
 555                         if (match_int(args, &option))
 556                                 return 0;
 557                         uopt->lastblock = option;
 558                         if (!remount)
 559                                 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
 560                         break;
 561                 case Opt_anchor:
 562                         if (match_int(args, &option))
 563                                 return 0;
 564                         uopt->anchor = option;
 565                         break;
 566                 case Opt_volume:
 567                 case Opt_partition:
 568                 case Opt_fileset:
 569                 case Opt_rootdir:
 570                         /* Ignored (never implemented properly) */
 571                         break;
 572                 case Opt_utf8:
 573                         uopt->flags |= (1 << UDF_FLAG_UTF8);
 574                         break;
 575                 case Opt_iocharset:
 576                         if (!remount) {
 577                                 if (uopt->nls_map)
 578                                         unload_nls(uopt->nls_map);
 579                                 uopt->nls_map = load_nls(args[0].from);
 580                                 uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
 581                         }
 582                         break;
 583                 case Opt_uforget:
 584                         uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
 585                         break;
 586                 case Opt_uignore:
 587                 case Opt_gignore:
 588                         /* These options are superseeded by uid=<number> */
 589                         break;
 590                 case Opt_gforget:
 591                         uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
 592                         break;
 593                 case Opt_fmode:
 594                         if (match_octal(args, &option))
 595                                 return 0;
 596                         uopt->fmode = option & 0777;
 597                         break;
 598                 case Opt_dmode:
 599                         if (match_octal(args, &option))
 600                                 return 0;
 601                         uopt->dmode = option & 0777;
 602                         break;
 603                 default:
 604                         pr_err("bad mount option \"%s\" or missing value\n", p);
 605                         return 0;
 606                 }
 607         }
 608         return 1;
 609 }
 610
 611 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
 612 {
 613         struct udf_options uopt;
 614         struct udf_sb_info *sbi = UDF_SB(sb);
 615         int error = 0;
 616         struct logicalVolIntegrityDescImpUse *lvidiu = udf_sb_lvidiu(sb);
 617
 618         sync_filesystem(sb);
 619         if (lvidiu) {
 620                 int write_rev = le16_to_cpu(lvidiu->minUDFWriteRev);
 621                 if (write_rev > UDF_MAX_WRITE_VERSION && !(*flags & SB_RDONLY))
 622                         return -EACCES;
 623         }
 624
 625         uopt.flags = sbi->s_flags;
 626         uopt.uid   = sbi->s_uid;
 627         uopt.gid   = sbi->s_gid;
 628         uopt.umask = sbi->s_umask;
 629         uopt.fmode = sbi->s_fmode;
 630         uopt.dmode = sbi->s_dmode;
 631         uopt.nls_map = NULL;
 632
 633         if (!udf_parse_options(options, &uopt, true))
 634                 return -EINVAL;
 635
 636         write_lock(&sbi->s_cred_lock);
 637         sbi->s_flags = uopt.flags;
 638         sbi->s_uid   = uopt.uid;
 639         sbi->s_gid   = uopt.gid;
 640         sbi->s_umask = uopt.umask;
 641         sbi->s_fmode = uopt.fmode;
 642         sbi->s_dmode = uopt.dmode;
 643         write_unlock(&sbi->s_cred_lock);
 644
 645         if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
 646                 goto out_unlock;
 647
 648         if (*flags & SB_RDONLY)
 649                 udf_close_lvid(sb);
 650         else
 651                 udf_open_lvid(sb);
 652
 653 out_unlock:
 654         return error;
 655 }
 656
 657 /* Check Volume Structure Descriptors (ECMA 167 2/9.1) */
 658 /* We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
 659 static loff_t udf_check_vsd(struct super_block *sb)
 660 {
 661         struct volStructDesc *vsd = NULL;
 662         loff_t sector = VSD_FIRST_SECTOR_OFFSET;
 663         int sectorsize;
 664         struct buffer_head *bh = NULL;
 665         int nsr02 = 0;
 666         int nsr03 = 0;
 667         struct udf_sb_info *sbi;
 668
 669         sbi = UDF_SB(sb);
 670         if (sb->s_blocksize < sizeof(struct volStructDesc))
 671                 sectorsize = sizeof(struct volStructDesc);
 672         else
 673                 sectorsize = sb->s_blocksize;
 674
 675         sector += (((loff_t)sbi->s_session) << sb->s_blocksize_bits);
 676
 677         udf_debug("Starting at sector %u (%lu byte sectors)\n",
 678                   (unsigned int)(sector >> sb->s_blocksize_bits),
 679                   sb->s_blocksize);
 680         /* Process the sequence (if applicable). The hard limit on the sector
 681          * offset is arbitrary, hopefully large enough so that all valid UDF
 682          * filesystems will be recognised. There is no mention of an upper
 683          * bound to the size of the volume recognition area in the standard.
 684          *  The limit will prevent the code to read all the sectors of a
 685          * specially crafted image (like a bluray disc full of CD001 sectors),
 686          * potentially causing minutes or even hours of uninterruptible I/O
 687          * activity. This actually happened with uninitialised SSD partitions
 688          * (all 0xFF) before the check for the limit and all valid IDs were
 689          * added */
 690         for (; !nsr02 && !nsr03 && sector < VSD_MAX_SECTOR_OFFSET;
 691              sector += sectorsize) {
 692                 /* Read a block */
 693                 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
 694                 if (!bh)
 695                         break;
 696
 697                 /* Look for ISO  descriptors */
 698                 vsd = (struct volStructDesc *)(bh->b_data +
 699                                               (sector & (sb->s_blocksize - 1)));
 700
 701                 if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
 702                                     VSD_STD_ID_LEN)) {
 703                         switch (vsd->structType) {
 704                         case 0:
 705                                 udf_debug("ISO9660 Boot Record found\n");
 706                                 break;
 707                         case 1:
 708                                 udf_debug("ISO9660 Primary Volume Descriptor found\n");
 709                                 break;
 710                         case 2:
 711                                 udf_debug("ISO9660 Supplementary Volume Descriptor found\n");
 712                                 break;
 713                         case 3:
 714                                 udf_debug("ISO9660 Volume Partition Descriptor found\n");
 715                                 break;
 716                         case 255:
 717                                 udf_debug("ISO9660 Volume Descriptor Set Terminator found\n");
 718                                 break;
 719                         default:
 720                                 udf_debug("ISO9660 VRS (%u) found\n",
 721                                           vsd->structType);
 722                                 break;
 723                         }
 724                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
 725                                     VSD_STD_ID_LEN))
 726                         ; /* nothing */
 727                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
 728                                     VSD_STD_ID_LEN)) {
 729                         brelse(bh);
 730                         break;
 731                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
 732                                     VSD_STD_ID_LEN))
 733                         nsr02 = sector;
 734                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
 735                                     VSD_STD_ID_LEN))
 736                         nsr03 = sector;
 737                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BOOT2,
 738                                     VSD_STD_ID_LEN))
 739                         ; /* nothing */
 740                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CDW02,
 741                                     VSD_STD_ID_LEN))
 742                         ; /* nothing */
 743                 else {
 744                         /* invalid id : end of volume recognition area */
 745                         brelse(bh);
 746                         break;
 747                 }
 748                 brelse(bh);
 749         }
 750
 751         if (nsr03)
 752                 return nsr03;
 753         else if (nsr02)
 754                 return nsr02;
 755         else if (!bh && sector - (sbi->s_session << sb->s_blocksize_bits) ==
 756                         VSD_FIRST_SECTOR_OFFSET)
 757                 return -1;
 758         else
 759                 return 0;
 760 }
 761
 762 static int udf_find_fileset(struct super_block *sb,
 763                             struct kernel_lb_addr *fileset,
 764                             struct kernel_lb_addr *root)
 765 {
 766         struct buffer_head *bh = NULL;
 767         long lastblock;
 768         uint16_t ident;
 769         struct udf_sb_info *sbi;
 770
 771         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
 772             fileset->partitionReferenceNum != 0xFFFF) {
 773                 bh = udf_read_ptagged(sb, fileset, 0, &ident);
 774
 775                 if (!bh) {
 776                         return 1;
 777                 } else if (ident != TAG_IDENT_FSD) {
 778                         brelse(bh);
 779                         return 1;
 780                 }
 781
 782         }
 783
 784         sbi = UDF_SB(sb);
 785         if (!bh) {
 786                 /* Search backwards through the partitions */
 787                 struct kernel_lb_addr newfileset;
 788
 789 /* --> cvg: FIXME - is it reasonable? */
 790                 return 1;
 791
 792                 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
 793                      (newfileset.partitionReferenceNum != 0xFFFF &&
 794                       fileset->logicalBlockNum == 0xFFFFFFFF &&
 795                       fileset->partitionReferenceNum == 0xFFFF);
 796                      newfileset.partitionReferenceNum--) {
 797                         lastblock = sbi->s_partmaps
 798                                         [newfileset.partitionReferenceNum]
 799                                                 .s_partition_len;
 800                         newfileset.logicalBlockNum = 0;
 801
 802                         do {
 803                                 bh = udf_read_ptagged(sb, &newfileset, 0,
 804                                                       &ident);
 805                                 if (!bh) {
 806                                         newfileset.logicalBlockNum++;
 807                                         continue;
 808                                 }
 809
 810                                 switch (ident) {
 811                                 case TAG_IDENT_SBD:
 812                                 {
 813                                         struct spaceBitmapDesc *sp;
 814                                         sp = (struct spaceBitmapDesc *)
 815                                                                 bh->b_data;
 816                                         newfileset.logicalBlockNum += 1 +
 817                                                 ((le32_to_cpu(sp->numOfBytes) +
 818                                                   sizeof(struct spaceBitmapDesc)
 819                                                   - 1) >> sb->s_blocksize_bits);
 820                                         brelse(bh);
 821                                         break;
 822                                 }
 823                                 case TAG_IDENT_FSD:
 824                                         *fileset = newfileset;
 825                                         break;
 826                                 default:
 827                                         newfileset.logicalBlockNum++;
 828                                         brelse(bh);
 829                                         bh = NULL;
 830                                         break;
 831                                 }
 832                         } while (newfileset.logicalBlockNum < lastblock &&
 833                                  fileset->logicalBlockNum == 0xFFFFFFFF &&
 834                                  fileset->partitionReferenceNum == 0xFFFF);
 835                 }
 836         }
 837
 838         if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
 839              fileset->partitionReferenceNum != 0xFFFF) && bh) {
 840                 udf_debug("Fileset at block=%u, partition=%u\n",
 841                           fileset->logicalBlockNum,
 842                           fileset->partitionReferenceNum);
 843
 844                 sbi->s_partition = fileset->partitionReferenceNum;
 845                 udf_load_fileset(sb, bh, root);
 846                 brelse(bh);
 847                 return 0;
 848         }
 849         return 1;
 850 }
 851
 852 /*
 853  * Load primary Volume Descriptor Sequence
 854  *
 855  * Return <0 on error, 0 on success. -EAGAIN is special meaning next sequence
 856  * should be tried.
 857  */
 858 static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
 859 {
 860         struct primaryVolDesc *pvoldesc;
 861         uint8_t *outstr;
 862         struct buffer_head *bh;
 863         uint16_t ident;
 864         int ret = -ENOMEM;
 865
 866         outstr = kmalloc(128, GFP_NOFS);
 867         if (!outstr)
 868                 return -ENOMEM;
 869
 870         bh = udf_read_tagged(sb, block, block, &ident);
 871         if (!bh) {
 872                 ret = -EAGAIN;
 873                 goto out2;
 874         }
 875
 876         if (ident != TAG_IDENT_PVD) {
 877                 ret = -EIO;
 878                 goto out_bh;
 879         }
 880
 881         pvoldesc = (struct primaryVolDesc *)bh->b_data;
 882
 883         if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
 884                               pvoldesc->recordingDateAndTime)) {
 885 #ifdef UDFFS_DEBUG
 886                 struct timestamp *ts = &pvoldesc->recordingDateAndTime;
 887                 udf_debug("recording time %04u/%02u/%02u %02u:%02u (%x)\n",
 888                           le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
 889                           ts->minute, le16_to_cpu(ts->typeAndTimezone));
 890 #endif
 891         }
 892
 893         ret = udf_dstrCS0toChar(sb, outstr, 31, pvoldesc->volIdent, 32);
 894         if (ret < 0)
 895                 goto out_bh;
 896
 897         strncpy(UDF_SB(sb)->s_volume_ident, outstr, ret);
 898         udf_debug("volIdent[] = '%s'\n", UDF_SB(sb)->s_volume_ident);
 899
 900         ret = udf_dstrCS0toChar(sb, outstr, 127, pvoldesc->volSetIdent, 128);
 901         if (ret < 0)
 902                 goto out_bh;
 903
 904         outstr[ret] = 0;
 905         udf_debug("volSetIdent[] = '%s'\n", outstr);
 906
 907         ret = 0;
 908 out_bh:
 909         brelse(bh);
 910 out2:
 911         kfree(outstr);
 912         return ret;
 913 }
 914
 915 struct inode *udf_find_metadata_inode_efe(struct super_block *sb,
 916                                         u32 meta_file_loc, u32 partition_ref)
 917 {
 918         struct kernel_lb_addr addr;
 919         struct inode *metadata_fe;
 920
 921         addr.logicalBlockNum = meta_file_loc;
 922         addr.partitionReferenceNum = partition_ref;
 923
 924         metadata_fe = udf_iget_special(sb, &addr);
 925
 926         if (IS_ERR(metadata_fe)) {
 927                 udf_warn(sb, "metadata inode efe not found\n");
 928                 return metadata_fe;
 929         }
 930         if (UDF_I(metadata_fe)->i_alloc_type != ICBTAG_FLAG_AD_SHORT) {
 931                 udf_warn(sb, "metadata inode efe does not have short allocation descriptors!\n");
 932                 iput(metadata_fe);
 933                 return ERR_PTR(-EIO);
 934         }
 935
 936         return metadata_fe;
 937 }
 938
 939 static int udf_load_metadata_files(struct super_block *sb, int partition,
 940                                    int type1_index)
 941 {
 942         struct udf_sb_info *sbi = UDF_SB(sb);
 943         struct udf_part_map *map;
 944         struct udf_meta_data *mdata;
 945         struct kernel_lb_addr addr;
 946         struct inode *fe;
 947
 948         map = &sbi->s_partmaps[partition];
 949         mdata = &map->s_type_specific.s_metadata;
 950         mdata->s_phys_partition_ref = type1_index;
 951
 952         /* metadata address */
 953         udf_debug("Metadata file location: block = %u part = %u\n",
 954                   mdata->s_meta_file_loc, mdata->s_phys_partition_ref);
 955
 956         fe = udf_find_metadata_inode_efe(sb, mdata->s_meta_file_loc,
 957                                          mdata->s_phys_partition_ref);
 958         if (IS_ERR(fe)) {
 959                 /* mirror file entry */
 960                 udf_debug("Mirror metadata file location: block = %u part = %u\n",
 961                           mdata->s_mirror_file_loc, mdata->s_phys_partition_ref);
 962
 963                 fe = udf_find_metadata_inode_efe(sb, mdata->s_mirror_file_loc,
 964                                                  mdata->s_phys_partition_ref);
 965
 966                 if (IS_ERR(fe)) {
 967                         udf_err(sb, "Both metadata and mirror metadata inode efe can not found\n");
 968                         return PTR_ERR(fe);
 969                 }
 970                 mdata->s_mirror_fe = fe;
 971         } else
 972                 mdata->s_metadata_fe = fe;
 973
 974
 975         /*
 976          * bitmap file entry
 977          * Note:
 978          * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
 979         */
 980         if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
 981                 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
 982                 addr.partitionReferenceNum = mdata->s_phys_partition_ref;
 983
 984                 udf_debug("Bitmap file location: block = %u part = %u\n",
 985                           addr.logicalBlockNum, addr.partitionReferenceNum);
 986
 987                 fe = udf_iget_special(sb, &addr);
 988                 if (IS_ERR(fe)) {
 989                         if (sb_rdonly(sb))
 990                                 udf_warn(sb, "bitmap inode efe not found but it's ok since the disc is mounted read-only\n");
 991                         else {
 992                                 udf_err(sb, "bitmap inode efe not found and attempted read-write mount\n");
 993                                 return PTR_ERR(fe);
 994                         }
 995                 } else
 996                         mdata->s_bitmap_fe = fe;
 997         }
 998
 999         udf_debug("udf_load_metadata_files Ok\n");
1000         return 0;
1001 }
1002
1003 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
1004                              struct kernel_lb_addr *root)
1005 {
1006         struct fileSetDesc *fset;
1007
1008         fset = (struct fileSetDesc *)bh->b_data;
1009
1010         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
1011
1012         UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
1013
1014         udf_debug("Rootdir at block=%u, partition=%u\n",
1015                   root->logicalBlockNum, root->partitionReferenceNum);
1016 }
1017
1018 int udf_compute_nr_groups(struct super_block *sb, u32 partition)
1019 {
1020         struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
1021         return DIV_ROUND_UP(map->s_partition_len +
1022                             (sizeof(struct spaceBitmapDesc) << 3),
1023                             sb->s_blocksize * 8);
1024 }
1025
1026 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
1027 {
1028         struct udf_bitmap *bitmap;
1029         int nr_groups;
1030         int size;
1031
1032         nr_groups = udf_compute_nr_groups(sb, index);
1033         size = sizeof(struct udf_bitmap) +
1034                 (sizeof(struct buffer_head *) * nr_groups);
1035
1036         if (size <= PAGE_SIZE)
1037                 bitmap = kzalloc(size, GFP_KERNEL);
1038         else
1039                 bitmap = vzalloc(size); /* TODO: get rid of vzalloc */
1040
1041         if (!bitmap)
1042                 return NULL;
1043
1044         bitmap->s_nr_groups = nr_groups;
1045         return bitmap;
1046 }
1047
1048 static int udf_fill_partdesc_info(struct super_block *sb,
1049                 struct partitionDesc *p, int p_index)
1050 {
1051         struct udf_part_map *map;
1052         struct udf_sb_info *sbi = UDF_SB(sb);
1053         struct partitionHeaderDesc *phd;
1054
1055         map = &sbi->s_partmaps[p_index];
1056
1057         map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
1058         map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
1059
1060         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
1061                 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
1062         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
1063                 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
1064         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
1065                 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
1066         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
1067                 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
1068
1069         udf_debug("Partition (%d type %x) starts at physical %u, block length %u\n",
1070                   p_index, map->s_partition_type,
1071                   map->s_partition_root, map->s_partition_len);
1072
1073         if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1074             strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
1075                 return 0;
1076
1077         phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1078         if (phd->unallocSpaceTable.extLength) {
1079                 struct kernel_lb_addr loc = {
1080                         .logicalBlockNum = le32_to_cpu(
1081                                 phd->unallocSpaceTable.extPosition),
1082                         .partitionReferenceNum = p_index,
1083                 };
1084                 struct inode *inode;
1085
1086                 inode = udf_iget_special(sb, &loc);
1087                 if (IS_ERR(inode)) {
1088                         udf_debug("cannot load unallocSpaceTable (part %d)\n",
1089                                   p_index);
1090                         return PTR_ERR(inode);
1091                 }
1092                 map->s_uspace.s_table = inode;
1093                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1094                 udf_debug("unallocSpaceTable (part %d) @ %lu\n",
1095                           p_index, map->s_uspace.s_table->i_ino);
1096         }
1097
1098         if (phd->unallocSpaceBitmap.extLength) {
1099                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1100                 if (!bitmap)
1101                         return -ENOMEM;
1102                 map->s_uspace.s_bitmap = bitmap;
1103                 bitmap->s_extPosition = le32_to_cpu(
1104                                 phd->unallocSpaceBitmap.extPosition);
1105                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1106                 udf_debug("unallocSpaceBitmap (part %d) @ %u\n",
1107                           p_index, bitmap->s_extPosition);
1108         }
1109
1110         if (phd->partitionIntegrityTable.extLength)
1111                 udf_debug("partitionIntegrityTable (part %d)\n", p_index);
1112
1113         if (phd->freedSpaceTable.extLength) {
1114                 struct kernel_lb_addr loc = {
1115                         .logicalBlockNum = le32_to_cpu(
1116                                 phd->freedSpaceTable.extPosition),
1117                         .partitionReferenceNum = p_index,
1118                 };
1119                 struct inode *inode;
1120
1121                 inode = udf_iget_special(sb, &loc);
1122                 if (IS_ERR(inode)) {
1123                         udf_debug("cannot load freedSpaceTable (part %d)\n",
1124                                   p_index);
1125                         return PTR_ERR(inode);
1126                 }
1127                 map->s_fspace.s_table = inode;
1128                 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
1129                 udf_debug("freedSpaceTable (part %d) @ %lu\n",
1130                           p_index, map->s_fspace.s_table->i_ino);
1131         }
1132
1133         if (phd->freedSpaceBitmap.extLength) {
1134                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1135                 if (!bitmap)
1136                         return -ENOMEM;
1137                 map->s_fspace.s_bitmap = bitmap;
1138                 bitmap->s_extPosition = le32_to_cpu(
1139                                 phd->freedSpaceBitmap.extPosition);
1140                 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1141                 udf_debug("freedSpaceBitmap (part %d) @ %u\n",
1142                           p_index, bitmap->s_extPosition);
1143         }
1144         return 0;
1145 }
1146
1147 static void udf_find_vat_block(struct super_block *sb, int p_index,
1148                                int type1_index, sector_t start_block)
1149 {
1150         struct udf_sb_info *sbi = UDF_SB(sb);
1151         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1152         sector_t vat_block;
1153         struct kernel_lb_addr ino;
1154         struct inode *inode;
1155
1156         /*
1157          * VAT file entry is in the last recorded block. Some broken disks have
1158          * it a few blocks before so try a bit harder...
1159          */
1160         ino.partitionReferenceNum = type1_index;
1161         for (vat_block = start_block;
1162              vat_block >= map->s_partition_root &&
1163              vat_block >= start_block - 3; vat_block--) {
1164                 ino.logicalBlockNum = vat_block - map->s_partition_root;
1165                 inode = udf_iget_special(sb, &ino);
1166                 if (!IS_ERR(inode)) {
1167                         sbi->s_vat_inode = inode;
1168                         break;
1169                 }
1170         }
1171 }
1172
1173 static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1174 {
1175         struct udf_sb_info *sbi = UDF_SB(sb);
1176         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1177         struct buffer_head *bh = NULL;
1178         struct udf_inode_info *vati;
1179         uint32_t pos;
1180         struct virtualAllocationTable20 *vat20;
1181         sector_t blocks = i_size_read(sb->s_bdev->bd_inode) >>
1182                           sb->s_blocksize_bits;
1183
1184         udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block);
1185         if (!sbi->s_vat_inode &&
1186             sbi->s_last_block != blocks - 1) {
1187                 pr_notice("Failed to read VAT inode from the last recorded block (%lu), retrying with the last block of the device (%lu).\n",
1188                           (unsigned long)sbi->s_last_block,
1189                           (unsigned long)blocks - 1);
1190                 udf_find_vat_block(sb, p_index, type1_index, blocks - 1);
1191         }
1192         if (!sbi->s_vat_inode)
1193                 return -EIO;
1194
1195         if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1196                 map->s_type_specific.s_virtual.s_start_offset = 0;
1197                 map->s_type_specific.s_virtual.s_num_entries =
1198                         (sbi->s_vat_inode->i_size - 36) >> 2;
1199         } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1200                 vati = UDF_I(sbi->s_vat_inode);
1201                 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1202                         pos = udf_block_map(sbi->s_vat_inode, 0);
1203                         bh = sb_bread(sb, pos);
1204                         if (!bh)
1205                                 return -EIO;
1206                         vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1207                 } else {
1208                         vat20 = (struct virtualAllocationTable20 *)
1209                                                         vati->i_ext.i_data;
1210                 }
1211
1212                 map->s_type_specific.s_virtual.s_start_offset =
1213                         le16_to_cpu(vat20->lengthHeader);
1214                 map->s_type_specific.s_virtual.s_num_entries =
1215                         (sbi->s_vat_inode->i_size -
1216                                 map->s_type_specific.s_virtual.
1217                                         s_start_offset) >> 2;
1218                 brelse(bh);
1219         }
1220         return 0;
1221 }
1222
1223 /*
1224  * Load partition descriptor block
1225  *
1226  * Returns <0 on error, 0 on success, -EAGAIN is special - try next descriptor
1227  * sequence.
1228  */
1229 static int udf_load_partdesc(struct super_block *sb, sector_t block)
1230 {
1231         struct buffer_head *bh;
1232         struct partitionDesc *p;
1233         struct udf_part_map *map;
1234         struct udf_sb_info *sbi = UDF_SB(sb);
1235         int i, type1_idx;
1236         uint16_t partitionNumber;
1237         uint16_t ident;
1238         int ret;
1239
1240         bh = udf_read_tagged(sb, block, block, &ident);
1241         if (!bh)
1242                 return -EAGAIN;
1243         if (ident != TAG_IDENT_PD) {
1244                 ret = 0;
1245                 goto out_bh;
1246         }
1247
1248         p = (struct partitionDesc *)bh->b_data;
1249         partitionNumber = le16_to_cpu(p->partitionNumber);
1250
1251         /* First scan for TYPE1 and SPARABLE partitions */
1252         for (i = 0; i < sbi->s_partitions; i++) {
1253                 map = &sbi->s_partmaps[i];
1254                 udf_debug("Searching map: (%u == %u)\n",
1255                           map->s_partition_num, partitionNumber);
1256                 if (map->s_partition_num == partitionNumber &&
1257                     (map->s_partition_type == UDF_TYPE1_MAP15 ||
1258                      map->s_partition_type == UDF_SPARABLE_MAP15))
1259                         break;
1260         }
1261
1262         if (i >= sbi->s_partitions) {
1263                 udf_debug("Partition (%u) not found in partition map\n",
1264                           partitionNumber);
1265                 ret = 0;
1266                 goto out_bh;
1267         }
1268
1269         ret = udf_fill_partdesc_info(sb, p, i);
1270         if (ret < 0)
1271                 goto out_bh;
1272
1273         /*
1274          * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1275          * PHYSICAL partitions are already set up
1276          */
1277         type1_idx = i;
1278 #ifdef UDFFS_DEBUG
1279         map = NULL; /* supress 'maybe used uninitialized' warning */
1280 #endif
1281         for (i = 0; i < sbi->s_partitions; i++) {
1282                 map = &sbi->s_partmaps[i];
1283
1284                 if (map->s_partition_num == partitionNumber &&
1285                     (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1286                      map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1287                      map->s_partition_type == UDF_METADATA_MAP25))
1288                         break;
1289         }
1290
1291         if (i >= sbi->s_partitions) {
1292                 ret = 0;
1293                 goto out_bh;
1294         }
1295
1296         ret = udf_fill_partdesc_info(sb, p, i);
1297         if (ret < 0)
1298                 goto out_bh;
1299
1300         if (map->s_partition_type == UDF_METADATA_MAP25) {
1301                 ret = udf_load_metadata_files(sb, i, type1_idx);
1302                 if (ret < 0) {
1303                         udf_err(sb, "error loading MetaData partition map %d\n",
1304                                 i);
1305                         goto out_bh;
1306                 }
1307         } else {
1308                 /*
1309                  * If we have a partition with virtual map, we don't handle
1310                  * writing to it (we overwrite blocks instead of relocating
1311                  * them).
1312                  */
1313                 if (!sb_rdonly(sb)) {
1314                         ret = -EACCES;
1315                         goto out_bh;
1316                 }
1317                 ret = udf_load_vat(sb, i, type1_idx);
1318                 if (ret < 0)
1319                         goto out_bh;
1320         }
1321         ret = 0;
1322 out_bh:
1323         /* In case loading failed, we handle cleanup in udf_fill_super */
1324         brelse(bh);
1325         return ret;
1326 }
1327
1328 static int udf_load_sparable_map(struct super_block *sb,
1329                                  struct udf_part_map *map,
1330                                  struct sparablePartitionMap *spm)
1331 {
1332         uint32_t loc;
1333         uint16_t ident;
1334         struct sparingTable *st;
1335         struct udf_sparing_data *sdata = &map->s_type_specific.s_sparing;
1336         int i;
1337         struct buffer_head *bh;
1338
1339         map->s_partition_type = UDF_SPARABLE_MAP15;
1340         sdata->s_packet_len = le16_to_cpu(spm->packetLength);
1341         if (!is_power_of_2(sdata->s_packet_len)) {
1342                 udf_err(sb, "error loading logical volume descriptor: "
1343                         "Invalid packet length %u\n",
1344                         (unsigned)sdata->s_packet_len);
1345                 return -EIO;
1346         }
1347         if (spm->numSparingTables > 4) {
1348                 udf_err(sb, "error loading logical volume descriptor: "
1349                         "Too many sparing tables (%d)\n",
1350                         (int)spm->numSparingTables);
1351                 return -EIO;
1352         }
1353
1354         for (i = 0; i < spm->numSparingTables; i++) {
1355                 loc = le32_to_cpu(spm->locSparingTable[i]);
1356                 bh = udf_read_tagged(sb, loc, loc, &ident);
1357                 if (!bh)
1358                         continue;
1359
1360                 st = (struct sparingTable *)bh->b_data;
1361                 if (ident != 0 ||
1362                     strncmp(st->sparingIdent.ident, UDF_ID_SPARING,
1363                             strlen(UDF_ID_SPARING)) ||
1364                     sizeof(*st) + le16_to_cpu(st->reallocationTableLen) >
1365                                                         sb->s_blocksize) {
1366                         brelse(bh);
1367                         continue;
1368                 }
1369
1370                 sdata->s_spar_map[i] = bh;
1371         }
1372         map->s_partition_func = udf_get_pblock_spar15;
1373         return 0;
1374 }
1375
1376 static int udf_load_logicalvol(struct super_block *sb, sector_t block,
1377                                struct kernel_lb_addr *fileset)
1378 {
1379         struct logicalVolDesc *lvd;
1380         int i, offset;
1381         uint8_t type;
1382         struct udf_sb_info *sbi = UDF_SB(sb);
1383         struct genericPartitionMap *gpm;
1384         uint16_t ident;
1385         struct buffer_head *bh;
1386         unsigned int table_len;
1387         int ret;
1388
1389         bh = udf_read_tagged(sb, block, block, &ident);
1390         if (!bh)
1391                 return -EAGAIN;
1392         BUG_ON(ident != TAG_IDENT_LVD);
1393         lvd = (struct logicalVolDesc *)bh->b_data;
1394         table_len = le32_to_cpu(lvd->mapTableLength);
1395         if (table_len > sb->s_blocksize - sizeof(*lvd)) {
1396                 udf_err(sb, "error loading logical volume descriptor: "
1397                         "Partition table too long (%u > %lu)\n", table_len,
1398                         sb->s_blocksize - sizeof(*lvd));
1399                 ret = -EIO;
1400                 goto out_bh;
1401         }
1402
1403         ret = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1404         if (ret)
1405                 goto out_bh;
1406
1407         for (i = 0, offset = 0;
1408              i < sbi->s_partitions && offset < table_len;
1409              i++, offset += gpm->partitionMapLength) {
1410                 struct udf_part_map *map = &sbi->s_partmaps[i];
1411                 gpm = (struct genericPartitionMap *)
1412                                 &(lvd->partitionMaps[offset]);
1413                 type = gpm->partitionMapType;
1414                 if (type == 1) {
1415                         struct genericPartitionMap1 *gpm1 =
1416                                 (struct genericPartitionMap1 *)gpm;
1417                         map->s_partition_type = UDF_TYPE1_MAP15;
1418                         map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1419                         map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1420                         map->s_partition_func = NULL;
1421                 } else if (type == 2) {
1422                         struct udfPartitionMap2 *upm2 =
1423                                                 (struct udfPartitionMap2 *)gpm;
1424                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1425                                                 strlen(UDF_ID_VIRTUAL))) {
1426                                 u16 suf =
1427                                         le16_to_cpu(((__le16 *)upm2->partIdent.
1428                                                         identSuffix)[0]);
1429                                 if (suf < 0x0200) {
1430                                         map->s_partition_type =
1431                                                         UDF_VIRTUAL_MAP15;
1432                                         map->s_partition_func =
1433                                                         udf_get_pblock_virt15;
1434                                 } else {
1435                                         map->s_partition_type =
1436                                                         UDF_VIRTUAL_MAP20;
1437                                         map->s_partition_func =
1438                                                         udf_get_pblock_virt20;
1439                                 }
1440                         } else if (!strncmp(upm2->partIdent.ident,
1441                                                 UDF_ID_SPARABLE,
1442                                                 strlen(UDF_ID_SPARABLE))) {
1443                                 ret = udf_load_sparable_map(sb, map,
1444                                         (struct sparablePartitionMap *)gpm);
1445                                 if (ret < 0)
1446                                         goto out_bh;
1447                         } else if (!strncmp(upm2->partIdent.ident,
1448                                                 UDF_ID_METADATA,
1449                                                 strlen(UDF_ID_METADATA))) {
1450                                 struct udf_meta_data *mdata =
1451                                         &map->s_type_specific.s_metadata;
1452                                 struct metadataPartitionMap *mdm =
1453                                                 (struct metadataPartitionMap *)
1454                                                 &(lvd->partitionMaps[offset]);
1455                                 udf_debug("Parsing Logical vol part %d type %u  id=%s\n",
1456                                           i, type, UDF_ID_METADATA);
1457
1458                                 map->s_partition_type = UDF_METADATA_MAP25;
1459                                 map->s_partition_func = udf_get_pblock_meta25;
1460
1461                                 mdata->s_meta_file_loc   =
1462                                         le32_to_cpu(mdm->metadataFileLoc);
1463                                 mdata->s_mirror_file_loc =
1464                                         le32_to_cpu(mdm->metadataMirrorFileLoc);
1465                                 mdata->s_bitmap_file_loc =
1466                                         le32_to_cpu(mdm->metadataBitmapFileLoc);
1467                                 mdata->s_alloc_unit_size =
1468                                         le32_to_cpu(mdm->allocUnitSize);
1469                                 mdata->s_align_unit_size =
1470                                         le16_to_cpu(mdm->alignUnitSize);
1471                                 if (mdm->flags & 0x01)
1472                                         mdata->s_flags |= MF_DUPLICATE_MD;
1473
1474                                 udf_debug("Metadata Ident suffix=0x%x\n",
1475                                           le16_to_cpu(*(__le16 *)
1476                                                       mdm->partIdent.identSuffix));
1477                                 udf_debug("Metadata part num=%u\n",
1478                                           le16_to_cpu(mdm->partitionNum));
1479                                 udf_debug("Metadata part alloc unit size=%u\n",
1480                                           le32_to_cpu(mdm->allocUnitSize));
1481                                 udf_debug("Metadata file loc=%u\n",
1482                                           le32_to_cpu(mdm->metadataFileLoc));
1483                                 udf_debug("Mirror file loc=%u\n",
1484                                           le32_to_cpu(mdm->metadataMirrorFileLoc));
1485                                 udf_debug("Bitmap file loc=%u\n",
1486                                           le32_to_cpu(mdm->metadataBitmapFileLoc));
1487                                 udf_debug("Flags: %d %u\n",
1488                                           mdata->s_flags, mdm->flags);
1489                         } else {
1490                                 udf_debug("Unknown ident: %s\n",
1491                                           upm2->partIdent.ident);
1492                                 continue;
1493                         }
1494                         map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1495                         map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1496                 }
1497                 udf_debug("Partition (%d:%u) type %u on volume %u\n",
1498                           i, map->s_partition_num, type, map->s_volumeseqnum);
1499         }
1500
1501         if (fileset) {
1502                 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
1503
1504                 *fileset = lelb_to_cpu(la->extLocation);
1505                 udf_debug("FileSet found in LogicalVolDesc at block=%u, partition=%u\n",
1506                           fileset->logicalBlockNum,
1507                           fileset->partitionReferenceNum);
1508         }
1509         if (lvd->integritySeqExt.extLength)
1510                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1511         ret = 0;
1512 out_bh:
1513         brelse(bh);
1514         return ret;
1515 }
1516
1517 /*
1518  * Find the prevailing Logical Volume Integrity Descriptor.
1519  */
1520 static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
1521 {
1522         struct buffer_head *bh, *final_bh;
1523         uint16_t ident;
1524         struct udf_sb_info *sbi = UDF_SB(sb);
1525         struct logicalVolIntegrityDesc *lvid;
1526         int indirections = 0;
1527
1528         while (++indirections <= UDF_MAX_LVID_NESTING) {
1529                 final_bh = NULL;
1530                 while (loc.extLength > 0 &&
1531                         (bh = udf_read_tagged(sb, loc.extLocation,
1532                                         loc.extLocation, &ident))) {
1533                         if (ident != TAG_IDENT_LVID) {
1534                                 brelse(bh);
1535                                 break;
1536                         }
1537
1538                         brelse(final_bh);
1539                         final_bh = bh;
1540
1541                         loc.extLength -= sb->s_blocksize;
1542                         loc.extLocation++;
1543                 }
1544
1545                 if (!final_bh)
1546                         return;
1547
1548                 brelse(sbi->s_lvid_bh);
1549                 sbi->s_lvid_bh = final_bh;
1550
1551                 lvid = (struct logicalVolIntegrityDesc *)final_bh->b_data;
1552                 if (lvid->nextIntegrityExt.extLength == 0)
1553                         return;
1554
1555                 loc = leea_to_cpu(lvid->nextIntegrityExt);
1556         }
1557
1558         udf_warn(sb, "Too many LVID indirections (max %u), ignoring.\n",
1559                 UDF_MAX_LVID_NESTING);
1560         brelse(sbi->s_lvid_bh);
1561         sbi->s_lvid_bh = NULL;
1562 }
1563
1564 /*
1565  * Step for reallocation of table of partition descriptor sequence numbers.
1566  * Must be power of 2.
1567  */
1568 #define PART_DESC_ALLOC_STEP 32
1569
1570 struct desc_seq_scan_data {
1571         struct udf_vds_record vds[VDS_POS_LENGTH];
1572         unsigned int size_part_descs;
1573         struct udf_vds_record *part_descs_loc;
1574 };
1575
1576 static struct udf_vds_record *handle_partition_descriptor(
1577                                 struct buffer_head *bh,
1578                                 struct desc_seq_scan_data *data)
1579 {
1580         struct partitionDesc *desc = (struct partitionDesc *)bh->b_data;
1581         int partnum;
1582
1583         partnum = le16_to_cpu(desc->partitionNumber);
1584         if (partnum >= data->size_part_descs) {
1585                 struct udf_vds_record *new_loc;
1586                 unsigned int new_size = ALIGN(partnum, PART_DESC_ALLOC_STEP);
1587
1588                 new_loc = kzalloc(sizeof(*new_loc) * new_size, GFP_KERNEL);
1589                 if (!new_loc)
1590                         return ERR_PTR(-ENOMEM);
1591                 memcpy(new_loc, data->part_descs_loc,
1592                        data->size_part_descs * sizeof(*new_loc));
1593                 kfree(data->part_descs_loc);
1594                 data->part_descs_loc = new_loc;
1595                 data->size_part_descs = new_size;
1596         }
1597         return &(data->part_descs_loc[partnum]);
1598 }
1599
1600
1601 static struct udf_vds_record *get_volume_descriptor_record(uint16_t ident,
1602                 struct buffer_head *bh, struct desc_seq_scan_data *data)
1603 {
1604         switch (ident) {
1605         case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1606                 return &(data->vds[VDS_POS_PRIMARY_VOL_DESC]);
1607         case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1608                 return &(data->vds[VDS_POS_IMP_USE_VOL_DESC]);
1609         case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1610                 return &(data->vds[VDS_POS_LOGICAL_VOL_DESC]);
1611         case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1612                 return &(data->vds[VDS_POS_UNALLOC_SPACE_DESC]);
1613         case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1614                 return handle_partition_descriptor(bh, data);
1615         }
1616         return NULL;
1617 }
1618
1619 /*
1620  * Process a main/reserve volume descriptor sequence.
1621  *   @block             First block of first extent of the sequence.
1622  *   @lastblock         Lastblock of first extent of the sequence.
1623  *   @fileset           There we store extent containing root fileset
1624  *
1625  * Returns <0 on error, 0 on success. -EAGAIN is special - try next descriptor
1626  * sequence
1627  */
1628 static noinline int udf_process_sequence(
1629                 struct super_block *sb,
1630                 sector_t block, sector_t lastblock,
1631                 struct kernel_lb_addr *fileset)
1632 {
1633         struct buffer_head *bh = NULL;
1634         struct udf_vds_record *curr;
1635         struct generic_desc *gd;
1636         struct volDescPtr *vdp;
1637         bool done = false;
1638         uint32_t vdsn;
1639         uint16_t ident;
1640         int ret;
1641         unsigned int indirections = 0;
1642         struct desc_seq_scan_data data;
1643         unsigned int i;
1644
1645         memset(data.vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1646         data.size_part_descs = PART_DESC_ALLOC_STEP;
1647         data.part_descs_loc = kzalloc(sizeof(*data.part_descs_loc) *
1648                                         data.size_part_descs, GFP_KERNEL);
1649         if (!data.part_descs_loc)
1650                 return -ENOMEM;
1651
1652         /*
1653          * Read the main descriptor sequence and find which descriptors
1654          * are in it.
1655          */
1656         for (; (!done && block <= lastblock); block++) {
1657
1658                 bh = udf_read_tagged(sb, block, block, &ident);
1659                 if (!bh)
1660                         break;
1661
1662                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1663                 gd = (struct generic_desc *)bh->b_data;
1664                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1665                 switch (ident) {
1666                 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1667                         if (++indirections > UDF_MAX_TD_NESTING) {
1668                                 udf_err(sb, "too many Volume Descriptor "
1669                                         "Pointers (max %u supported)\n",
1670                                         UDF_MAX_TD_NESTING);
1671                                 brelse(bh);
1672                                 return -EIO;
1673                         }
1674
1675                         vdp = (struct volDescPtr *)bh->b_data;
1676                         block = le32_to_cpu(vdp->nextVolDescSeqExt.extLocation);
1677                         lastblock = le32_to_cpu(
1678                                 vdp->nextVolDescSeqExt.extLength) >>
1679                                 sb->s_blocksize_bits;
1680                         lastblock += block - 1;
1681                         /* For loop is going to increment 'block' again */
1682                         block--;
1683                         break;
1684                 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1685                 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1686                 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1687                 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1688                 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1689                         curr = get_volume_descriptor_record(ident, bh, &data);
1690                         if (IS_ERR(curr)) {
1691                                 brelse(bh);
1692                                 return PTR_ERR(curr);
1693                         }
1694                         /* Descriptor we don't care about? */
1695                         if (!curr)
1696                                 break;
1697                         if (vdsn >= curr->volDescSeqNum) {
1698                                 curr->volDescSeqNum = vdsn;
1699                                 curr->block = block;
1700                         }
1701                         break;
1702                 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1703                         done = true;
1704                         break;
1705                 }
1706                 brelse(bh);
1707         }
1708         /*
1709          * Now read interesting descriptors again and process them
1710          * in a suitable order
1711          */
1712         if (!data.vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1713                 udf_err(sb, "Primary Volume Descriptor not found!\n");
1714                 return -EAGAIN;
1715         }
1716         ret = udf_load_pvoldesc(sb, data.vds[VDS_POS_PRIMARY_VOL_DESC].block);
1717         if (ret < 0)
1718                 return ret;
1719
1720         if (data.vds[VDS_POS_LOGICAL_VOL_DESC].block) {
1721                 ret = udf_load_logicalvol(sb,
1722                                 data.vds[VDS_POS_LOGICAL_VOL_DESC].block,
1723                                 fileset);
1724                 if (ret < 0)
1725                         return ret;
1726         }
1727
1728         /* Now handle prevailing Partition Descriptors */
1729         for (i = 0; i < data.size_part_descs; i++) {
1730                 if (data.part_descs_loc[i].block) {
1731                         ret = udf_load_partdesc(sb,
1732                                                 data.part_descs_loc[i].block);
1733                         if (ret < 0)
1734                                 return ret;
1735                 }
1736         }
1737
1738         return 0;
1739 }
1740
1741 /*
1742  * Load Volume Descriptor Sequence described by anchor in bh
1743  *
1744  * Returns <0 on error, 0 on success
1745  */
1746 static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh,
1747                              struct kernel_lb_addr *fileset)
1748 {
1749         struct anchorVolDescPtr *anchor;
1750         sector_t main_s, main_e, reserve_s, reserve_e;
1751         int ret;
1752
1753         anchor = (struct anchorVolDescPtr *)bh->b_data;
1754
1755         /* Locate the main sequence */
1756         main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1757         main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1758         main_e = main_e >> sb->s_blocksize_bits;
1759         main_e += main_s - 1;
1760
1761         /* Locate the reserve sequence */
1762         reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1763         reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1764         reserve_e = reserve_e >> sb->s_blocksize_bits;
1765         reserve_e += reserve_s - 1;
1766
1767         /* Process the main & reserve sequences */
1768         /* responsible for finding the PartitionDesc(s) */
1769         ret = udf_process_sequence(sb, main_s, main_e, fileset);
1770         if (ret != -EAGAIN)
1771                 return ret;
1772         udf_sb_free_partitions(sb);
1773         ret = udf_process_sequence(sb, reserve_s, reserve_e, fileset);
1774         if (ret < 0) {
1775                 udf_sb_free_partitions(sb);
1776                 /* No sequence was OK, return -EIO */
1777                 if (ret == -EAGAIN)
1778                         ret = -EIO;
1779         }
1780         return ret;
1781 }
1782
1783 /*
1784  * Check whether there is an anchor block in the given block and
1785  * load Volume Descriptor Sequence if so.
1786  *
1787  * Returns <0 on error, 0 on success, -EAGAIN is special - try next anchor
1788  * block
1789  */
1790 static int udf_check_anchor_block(struct super_block *sb, sector_t block,
1791                                   struct kernel_lb_addr *fileset)
1792 {
1793         struct buffer_head *bh;
1794         uint16_t ident;
1795         int ret;
1796
1797         if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
1798             udf_fixed_to_variable(block) >=
1799             i_size_read(sb->s_bdev->bd_inode) >> sb->s_blocksize_bits)
1800                 return -EAGAIN;
1801
1802         bh = udf_read_tagged(sb, block, block, &ident);
1803         if (!bh)
1804                 return -EAGAIN;
1805         if (ident != TAG_IDENT_AVDP) {
1806                 brelse(bh);
1807                 return -EAGAIN;
1808         }
1809         ret = udf_load_sequence(sb, bh, fileset);
1810         brelse(bh);
1811         return ret;
1812 }
1813
1814 /*
1815  * Search for an anchor volume descriptor pointer.
1816  *
1817  * Returns < 0 on error, 0 on success. -EAGAIN is special - try next set
1818  * of anchors.
1819  */
1820 static int udf_scan_anchors(struct super_block *sb, sector_t *lastblock,
1821                             struct kernel_lb_addr *fileset)
1822 {
1823         sector_t last[6];
1824         int i;
1825         struct udf_sb_info *sbi = UDF_SB(sb);
1826         int last_count = 0;
1827         int ret;
1828
1829         /* First try user provided anchor */
1830         if (sbi->s_anchor) {
1831                 ret = udf_check_anchor_block(sb, sbi->s_anchor, fileset);
1832                 if (ret != -EAGAIN)
1833                         return ret;
1834         }
1835         /*
1836          * according to spec, anchor is in either:
1837          *     block 256
1838          *     lastblock-256
1839          *     lastblock
1840          *  however, if the disc isn't closed, it could be 512.
1841          */
1842         ret = udf_check_anchor_block(sb, sbi->s_session + 256, fileset);
1843         if (ret != -EAGAIN)
1844                 return ret;
1845         /*
1846          * The trouble is which block is the last one. Drives often misreport
1847          * this so we try various possibilities.
1848          */
1849         last[last_count++] = *lastblock;
1850         if (*lastblock >= 1)
1851                 last[last_count++] = *lastblock - 1;
1852         last[last_count++] = *lastblock + 1;
1853         if (*lastblock >= 2)
1854                 last[last_count++] = *lastblock - 2;
1855         if (*lastblock >= 150)
1856                 last[last_count++] = *lastblock - 150;
1857         if (*lastblock >= 152)
1858                 last[last_count++] = *lastblock - 152;
1859
1860         for (i = 0; i < last_count; i++) {
1861                 if (last[i] >= i_size_read(sb->s_bdev->bd_inode) >>
1862                                 sb->s_blocksize_bits)
1863                         continue;
1864                 ret = udf_check_anchor_block(sb, last[i], fileset);
1865                 if (ret != -EAGAIN) {
1866                         if (!ret)
1867                                 *lastblock = last[i];
1868                         return ret;
1869                 }
1870                 if (last[i] < 256)
1871                         continue;
1872                 ret = udf_check_anchor_block(sb, last[i] - 256, fileset);
1873                 if (ret != -EAGAIN) {
1874                         if (!ret)
1875                                 *lastblock = last[i];
1876                         return ret;
1877                 }
1878         }
1879
1880         /* Finally try block 512 in case media is open */
1881         return udf_check_anchor_block(sb, sbi->s_session + 512, fileset);
1882 }
1883
1884 /*
1885  * Find an anchor volume descriptor and load Volume Descriptor Sequence from
1886  * area specified by it. The function expects sbi->s_lastblock to be the last
1887  * block on the media.
1888  *
1889  * Return <0 on error, 0 if anchor found. -EAGAIN is special meaning anchor
1890  * was not found.
1891  */
1892 static int udf_find_anchor(struct super_block *sb,
1893                            struct kernel_lb_addr *fileset)
1894 {
1895         struct udf_sb_info *sbi = UDF_SB(sb);
1896         sector_t lastblock = sbi->s_last_block;
1897         int ret;
1898
1899         ret = udf_scan_anchors(sb, &lastblock, fileset);
1900         if (ret != -EAGAIN)
1901                 goto out;
1902
1903         /* No anchor found? Try VARCONV conversion of block numbers */
1904         UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
1905         lastblock = udf_variable_to_fixed(sbi->s_last_block);
1906         /* Firstly, we try to not convert number of the last block */
1907         ret = udf_scan_anchors(sb, &lastblock, fileset);
1908         if (ret != -EAGAIN)
1909                 goto out;
1910
1911         lastblock = sbi->s_last_block;
1912         /* Secondly, we try with converted number of the last block */
1913         ret = udf_scan_anchors(sb, &lastblock, fileset);
1914         if (ret < 0) {
1915                 /* VARCONV didn't help. Clear it. */
1916                 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
1917         }
1918 out:
1919         if (ret == 0)
1920                 sbi->s_last_block = lastblock;
1921         return ret;
1922 }
1923
1924 /*
1925  * Check Volume Structure Descriptor, find Anchor block and load Volume
1926  * Descriptor Sequence.
1927  *
1928  * Returns < 0 on error, 0 on success. -EAGAIN is special meaning anchor
1929  * block was not found.
1930  */
1931 static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
1932                         int silent, struct kernel_lb_addr *fileset)
1933 {
1934         struct udf_sb_info *sbi = UDF_SB(sb);
1935         loff_t nsr_off;
1936         int ret;
1937
1938         if (!sb_set_blocksize(sb, uopt->blocksize)) {
1939                 if (!silent)
1940                         udf_warn(sb, "Bad block size\n");
1941                 return -EINVAL;
1942         }
1943         sbi->s_last_block = uopt->lastblock;
1944         if (!uopt->novrs) {
1945                 /* Check that it is NSR02 compliant */
1946                 nsr_off = udf_check_vsd(sb);
1947                 if (!nsr_off) {
1948                         if (!silent)
1949                                 udf_warn(sb, "No VRS found\n");
1950                         return -EINVAL;
1951                 }
1952                 if (nsr_off == -1)
1953                         udf_debug("Failed to read sector at offset %d. "
1954                                   "Assuming open disc. Skipping validity "
1955                                   "check\n", VSD_FIRST_SECTOR_OFFSET);
1956                 if (!sbi->s_last_block)
1957                         sbi->s_last_block = udf_get_last_block(sb);
1958         } else {
1959                 udf_debug("Validity check skipped because of novrs option\n");
1960         }
1961
1962         /* Look for anchor block and load Volume Descriptor Sequence */
1963         sbi->s_anchor = uopt->anchor;
1964         ret = udf_find_anchor(sb, fileset);
1965         if (ret < 0) {
1966                 if (!silent && ret == -EAGAIN)
1967                         udf_warn(sb, "No anchor found\n");
1968                 return ret;
1969         }
1970         return 0;
1971 }
1972
1973 static void udf_open_lvid(struct super_block *sb)
1974 {
1975         struct udf_sb_info *sbi = UDF_SB(sb);
1976         struct buffer_head *bh = sbi->s_lvid_bh;
1977         struct logicalVolIntegrityDesc *lvid;
1978         struct logicalVolIntegrityDescImpUse *lvidiu;
1979         struct timespec ts;
1980
1981         if (!bh)
1982                 return;
1983         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1984         lvidiu = udf_sb_lvidiu(sb);
1985         if (!lvidiu)
1986                 return;
1987
1988         mutex_lock(&sbi->s_alloc_mutex);
1989         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1990         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1991         ktime_get_real_ts(&ts);
1992         udf_time_to_disk_stamp(&lvid->recordingDateAndTime, ts);
1993         if (le32_to_cpu(lvid->integrityType) == LVID_INTEGRITY_TYPE_CLOSE)
1994                 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN);
1995         else
1996                 UDF_SET_FLAG(sb, UDF_FLAG_INCONSISTENT);
1997
1998         lvid->descTag.descCRC = cpu_to_le16(
1999                 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
2000                         le16_to_cpu(lvid->descTag.descCRCLength)));
2001
2002         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
2003         mark_buffer_dirty(bh);
2004         sbi->s_lvid_dirty = 0;
2005         mutex_unlock(&sbi->s_alloc_mutex);
2006         /* Make opening of filesystem visible on the media immediately */
2007         sync_dirty_buffer(bh);
2008 }
2009
2010 static void udf_close_lvid(struct super_block *sb)
2011 {
2012         struct udf_sb_info *sbi = UDF_SB(sb);
2013         struct buffer_head *bh = sbi->s_lvid_bh;
2014         struct logicalVolIntegrityDesc *lvid;
2015         struct logicalVolIntegrityDescImpUse *lvidiu;
2016         struct timespec ts;
2017
2018         if (!bh)
2019                 return;
2020         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
2021         lvidiu = udf_sb_lvidiu(sb);
2022         if (!lvidiu)
2023                 return;
2024
2025         mutex_lock(&sbi->s_alloc_mutex);
2026         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
2027         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
2028         ktime_get_real_ts(&ts);
2029         udf_time_to_disk_stamp(&lvid->recordingDateAndTime, ts);
2030         if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
2031                 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
2032         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
2033                 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
2034         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
2035                 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
2036         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_INCONSISTENT))
2037                 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
2038
2039         lvid->descTag.descCRC = cpu_to_le16(
2040                         crc_itu_t(0, (char *)lvid + sizeof(struct tag),
2041                                 le16_to_cpu(lvid->descTag.descCRCLength)));
2042
2043         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
2044         /*
2045          * We set buffer uptodate unconditionally here to avoid spurious
2046          * warnings from mark_buffer_dirty() when previous EIO has marked
2047          * the buffer as !uptodate
2048          */
2049         set_buffer_uptodate(bh);
2050         mark_buffer_dirty(bh);
2051         sbi->s_lvid_dirty = 0;
2052         mutex_unlock(&sbi->s_alloc_mutex);
2053         /* Make closing of filesystem visible on the media immediately */
2054         sync_dirty_buffer(bh);
2055 }
2056
2057 u64 lvid_get_unique_id(struct super_block *sb)
2058 {
2059         struct buffer_head *bh;
2060         struct udf_sb_info *sbi = UDF_SB(sb);
2061         struct logicalVolIntegrityDesc *lvid;
2062         struct logicalVolHeaderDesc *lvhd;
2063         u64 uniqueID;
2064         u64 ret;
2065
2066         bh = sbi->s_lvid_bh;
2067         if (!bh)
2068                 return 0;
2069
2070         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
2071         lvhd = (struct logicalVolHeaderDesc *)lvid->logicalVolContentsUse;
2072
2073         mutex_lock(&sbi->s_alloc_mutex);
2074         ret = uniqueID = le64_to_cpu(lvhd->uniqueID);
2075         if (!(++uniqueID & 0xFFFFFFFF))
2076                 uniqueID += 16;
2077         lvhd->uniqueID = cpu_to_le64(uniqueID);
2078         mutex_unlock(&sbi->s_alloc_mutex);
2079         mark_buffer_dirty(bh);
2080
2081         return ret;
2082 }
2083
2084 static int udf_fill_super(struct super_block *sb, void *options, int silent)
2085 {
2086         int ret = -EINVAL;
2087         struct inode *inode = NULL;
2088         struct udf_options uopt;
2089         struct kernel_lb_addr rootdir, fileset;
2090         struct udf_sb_info *sbi;
2091         bool lvid_open = false;
2092
2093         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
2094         /* By default we'll use overflow[ug]id when UDF inode [ug]id == -1 */
2095         uopt.uid = make_kuid(current_user_ns(), overflowuid);
2096         uopt.gid = make_kgid(current_user_ns(), overflowgid);
2097         uopt.umask = 0;
2098         uopt.fmode = UDF_INVALID_MODE;
2099         uopt.dmode = UDF_INVALID_MODE;
2100         uopt.nls_map = NULL;
2101
2102         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
2103         if (!sbi)
2104                 return -ENOMEM;
2105
2106         sb->s_fs_info = sbi;
2107
2108         mutex_init(&sbi->s_alloc_mutex);
2109
2110         if (!udf_parse_options((char *)options, &uopt, false))
2111                 goto parse_options_failure;
2112
2113         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
2114             uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
2115                 udf_err(sb, "utf8 cannot be combined with iocharset\n");
2116                 goto parse_options_failure;
2117         }
2118         if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
2119                 uopt.nls_map = load_nls_default();
2120                 if (!uopt.nls_map)
2121                         uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
2122                 else
2123                         udf_debug("Using default NLS map\n");
2124         }
2125         if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
2126                 uopt.flags |= (1 << UDF_FLAG_UTF8);
2127
2128         fileset.logicalBlockNum = 0xFFFFFFFF;
2129         fileset.partitionReferenceNum = 0xFFFF;
2130
2131         sbi->s_flags = uopt.flags;
2132         sbi->s_uid = uopt.uid;
2133         sbi->s_gid = uopt.gid;
2134         sbi->s_umask = uopt.umask;
2135         sbi->s_fmode = uopt.fmode;
2136         sbi->s_dmode = uopt.dmode;
2137         sbi->s_nls_map = uopt.nls_map;
2138         rwlock_init(&sbi->s_cred_lock);
2139
2140         if (uopt.session == 0xFFFFFFFF)
2141                 sbi->s_session = udf_get_last_session(sb);
2142         else
2143                 sbi->s_session = uopt.session;
2144
2145         udf_debug("Multi-session=%d\n", sbi->s_session);
2146
2147         /* Fill in the rest of the superblock */
2148         sb->s_op = &udf_sb_ops;
2149         sb->s_export_op = &udf_export_ops;
2150
2151         sb->s_magic = UDF_SUPER_MAGIC;
2152         sb->s_time_gran = 1000;
2153
2154         if (uopt.flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) {
2155                 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
2156         } else {
2157                 uopt.blocksize = bdev_logical_block_size(sb->s_bdev);
2158                 while (uopt.blocksize <= 4096) {
2159                         ret = udf_load_vrs(sb, &uopt, silent, &fileset);
2160                         if (ret < 0) {
2161                                 if (!silent && ret != -EACCES) {
2162                                         pr_notice("Scanning with blocksize %u failed\n",
2163                                                   uopt.blocksize);
2164                                 }
2165                                 brelse(sbi->s_lvid_bh);
2166                                 sbi->s_lvid_bh = NULL;
2167                                 /*
2168                                  * EACCES is special - we want to propagate to
2169                                  * upper layers that we cannot handle RW mount.
2170                                  */
2171                                 if (ret == -EACCES)
2172                                         break;
2173                         } else
2174                                 break;
2175
2176                         uopt.blocksize <<= 1;
2177                 }
2178         }
2179         if (ret < 0) {
2180                 if (ret == -EAGAIN) {
2181                         udf_warn(sb, "No partition found (1)\n");
2182                         ret = -EINVAL;
2183                 }
2184                 goto error_out;
2185         }
2186
2187         udf_debug("Lastblock=%u\n", sbi->s_last_block);
2188
2189         if (sbi->s_lvid_bh) {
2190                 struct logicalVolIntegrityDescImpUse *lvidiu =
2191                                                         udf_sb_lvidiu(sb);
2192                 uint16_t minUDFReadRev;
2193                 uint16_t minUDFWriteRev;
2194
2195                 if (!lvidiu) {
2196                         ret = -EINVAL;
2197                         goto error_out;
2198                 }
2199                 minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
2200                 minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
2201                 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
2202                         udf_err(sb, "minUDFReadRev=%x (max is %x)\n",
2203                                 minUDFReadRev,
2204                                 UDF_MAX_READ_VERSION);
2205                         ret = -EINVAL;
2206                         goto error_out;
2207                 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION &&
2208                            !sb_rdonly(sb)) {
2209                         ret = -EACCES;
2210                         goto error_out;
2211                 }
2212
2213                 sbi->s_udfrev = minUDFWriteRev;
2214
2215                 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
2216                         UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
2217                 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
2218                         UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
2219         }
2220
2221         if (!sbi->s_partitions) {
2222                 udf_warn(sb, "No partition found (2)\n");
2223                 ret = -EINVAL;
2224                 goto error_out;
2225         }
2226
2227         if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
2228                         UDF_PART_FLAG_READ_ONLY &&
2229             !sb_rdonly(sb)) {
2230                 ret = -EACCES;
2231                 goto error_out;
2232         }
2233
2234         if (udf_find_fileset(sb, &fileset, &rootdir)) {
2235                 udf_warn(sb, "No fileset found\n");
2236                 ret = -EINVAL;
2237                 goto error_out;
2238         }
2239
2240         if (!silent) {
2241                 struct timestamp ts;
2242                 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
2243                 udf_info("Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
2244                          sbi->s_volume_ident,
2245                          le16_to_cpu(ts.year), ts.month, ts.day,
2246                          ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
2247         }
2248         if (!sb_rdonly(sb)) {
2249                 udf_open_lvid(sb);
2250                 lvid_open = true;
2251         }
2252
2253         /* Assign the root inode */
2254         /* assign inodes by physical block number */
2255         /* perhaps it's not extensible enough, but for now ... */
2256         inode = udf_iget(sb, &rootdir);
2257         if (IS_ERR(inode)) {
2258                 udf_err(sb, "Error in udf_iget, block=%u, partition=%u\n",
2259                        rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
2260                 ret = PTR_ERR(inode);
2261                 goto error_out;
2262         }
2263
2264         /* Allocate a dentry for the root inode */
2265         sb->s_root = d_make_root(inode);
2266         if (!sb->s_root) {
2267                 udf_err(sb, "Couldn't allocate root dentry\n");
2268                 ret = -ENOMEM;
2269                 goto error_out;
2270         }
2271         sb->s_maxbytes = MAX_LFS_FILESIZE;
2272         sb->s_max_links = UDF_MAX_LINKS;
2273         return 0;
2274
2275 error_out:
2276         iput(sbi->s_vat_inode);
2277 parse_options_failure:
2278         if (uopt.nls_map)
2279                 unload_nls(uopt.nls_map);
2280         if (lvid_open)
2281                 udf_close_lvid(sb);
2282         brelse(sbi->s_lvid_bh);
2283         udf_sb_free_partitions(sb);
2284         kfree(sbi);
2285         sb->s_fs_info = NULL;
2286
2287         return ret;
2288 }
2289
2290 void _udf_err(struct super_block *sb, const char *function,
2291               const char *fmt, ...)
2292 {
2293         struct va_format vaf;
2294         va_list args;
2295
2296         va_start(args, fmt);
2297
2298         vaf.fmt = fmt;
2299         vaf.va = &args;
2300
2301         pr_err("error (device %s): %s: %pV", sb->s_id, function, &vaf);
2302
2303         va_end(args);
2304 }
2305
2306 void _udf_warn(struct super_block *sb, const char *function,
2307                const char *fmt, ...)
2308 {
2309         struct va_format vaf;
2310         va_list args;
2311
2312         va_start(args, fmt);
2313
2314         vaf.fmt = fmt;
2315         vaf.va = &args;
2316
2317         pr_warn("warning (device %s): %s: %pV", sb->s_id, function, &vaf);
2318
2319         va_end(args);
2320 }
2321
2322 static void udf_put_super(struct super_block *sb)
2323 {
2324         struct udf_sb_info *sbi;
2325
2326         sbi = UDF_SB(sb);
2327
2328         iput(sbi->s_vat_inode);
2329         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2330                 unload_nls(sbi->s_nls_map);
2331         if (!sb_rdonly(sb))
2332                 udf_close_lvid(sb);
2333         brelse(sbi->s_lvid_bh);
2334         udf_sb_free_partitions(sb);
2335         mutex_destroy(&sbi->s_alloc_mutex);
2336         kfree(sb->s_fs_info);
2337         sb->s_fs_info = NULL;
2338 }
2339
2340 static int udf_sync_fs(struct super_block *sb, int wait)
2341 {
2342         struct udf_sb_info *sbi = UDF_SB(sb);
2343
2344         mutex_lock(&sbi->s_alloc_mutex);
2345         if (sbi->s_lvid_dirty) {
2346                 /*
2347                  * Blockdevice will be synced later so we don't have to submit
2348                  * the buffer for IO
2349                  */
2350                 mark_buffer_dirty(sbi->s_lvid_bh);
2351                 sbi->s_lvid_dirty = 0;
2352         }
2353         mutex_unlock(&sbi->s_alloc_mutex);
2354
2355         return 0;
2356 }
2357
2358 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
2359 {
2360         struct super_block *sb = dentry->d_sb;
2361         struct udf_sb_info *sbi = UDF_SB(sb);
2362         struct logicalVolIntegrityDescImpUse *lvidiu;
2363         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
2364
2365         lvidiu = udf_sb_lvidiu(sb);
2366         buf->f_type = UDF_SUPER_MAGIC;
2367         buf->f_bsize = sb->s_blocksize;
2368         buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
2369         buf->f_bfree = udf_count_free(sb);
2370         buf->f_bavail = buf->f_bfree;
2371         buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2372                                           le32_to_cpu(lvidiu->numDirs)) : 0)
2373                         + buf->f_bfree;
2374         buf->f_ffree = buf->f_bfree;
2375         buf->f_namelen = UDF_NAME_LEN;
2376         buf->f_fsid.val[0] = (u32)id;
2377         buf->f_fsid.val[1] = (u32)(id >> 32);
2378
2379         return 0;
2380 }
2381
2382 static unsigned int udf_count_free_bitmap(struct super_block *sb,
2383                                           struct udf_bitmap *bitmap)
2384 {
2385         struct buffer_head *bh = NULL;
2386         unsigned int accum = 0;
2387         int index;
2388         udf_pblk_t block = 0, newblock;
2389         struct kernel_lb_addr loc;
2390         uint32_t bytes;
2391         uint8_t *ptr;
2392         uint16_t ident;
2393         struct spaceBitmapDesc *bm;
2394
2395         loc.logicalBlockNum = bitmap->s_extPosition;
2396         loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
2397         bh = udf_read_ptagged(sb, &loc, 0, &ident);
2398
2399         if (!bh) {
2400                 udf_err(sb, "udf_count_free failed\n");
2401                 goto out;
2402         } else if (ident != TAG_IDENT_SBD) {
2403                 brelse(bh);
2404                 udf_err(sb, "udf_count_free failed\n");
2405                 goto out;
2406         }
2407
2408         bm = (struct spaceBitmapDesc *)bh->b_data;
2409         bytes = le32_to_cpu(bm->numOfBytes);
2410         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2411         ptr = (uint8_t *)bh->b_data;
2412
2413         while (bytes > 0) {
2414                 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2415                 accum += bitmap_weight((const unsigned long *)(ptr + index),
2416                                         cur_bytes * 8);
2417                 bytes -= cur_bytes;
2418                 if (bytes) {
2419                         brelse(bh);
2420                         newblock = udf_get_lb_pblock(sb, &loc, ++block);
2421                         bh = udf_tread(sb, newblock);
2422                         if (!bh) {
2423                                 udf_debug("read failed\n");
2424                                 goto out;
2425                         }
2426                         index = 0;
2427                         ptr = (uint8_t *)bh->b_data;
2428                 }
2429         }
2430         brelse(bh);
2431 out:
2432         return accum;
2433 }
2434
2435 static unsigned int udf_count_free_table(struct super_block *sb,
2436                                          struct inode *table)
2437 {
2438         unsigned int accum = 0;
2439         uint32_t elen;
2440         struct kernel_lb_addr eloc;
2441         int8_t etype;
2442         struct extent_position epos;
2443
2444         mutex_lock(&UDF_SB(sb)->s_alloc_mutex);
2445         epos.block = UDF_I(table)->i_location;
2446         epos.offset = sizeof(struct unallocSpaceEntry);
2447         epos.bh = NULL;
2448
2449         while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2450                 accum += (elen >> table->i_sb->s_blocksize_bits);
2451
2452         brelse(epos.bh);
2453         mutex_unlock(&UDF_SB(sb)->s_alloc_mutex);
2454
2455         return accum;
2456 }
2457
2458 static unsigned int udf_count_free(struct super_block *sb)
2459 {
2460         unsigned int accum = 0;
2461         struct udf_sb_info *sbi;
2462         struct udf_part_map *map;
2463
2464         sbi = UDF_SB(sb);
2465         if (sbi->s_lvid_bh) {
2466                 struct logicalVolIntegrityDesc *lvid =
2467                         (struct logicalVolIntegrityDesc *)
2468                         sbi->s_lvid_bh->b_data;
2469                 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
2470                         accum = le32_to_cpu(
2471                                         lvid->freeSpaceTable[sbi->s_partition]);
2472                         if (accum == 0xFFFFFFFF)
2473                                 accum = 0;
2474                 }
2475         }
2476
2477         if (accum)
2478                 return accum;
2479
2480         map = &sbi->s_partmaps[sbi->s_partition];
2481         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2482                 accum += udf_count_free_bitmap(sb,
2483                                                map->s_uspace.s_bitmap);
2484         }
2485         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
2486                 accum += udf_count_free_bitmap(sb,
2487                                                map->s_fspace.s_bitmap);
2488         }
2489         if (accum)
2490                 return accum;
2491
2492         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2493                 accum += udf_count_free_table(sb,
2494                                               map->s_uspace.s_table);
2495         }
2496         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
2497                 accum += udf_count_free_table(sb,
2498                                               map->s_fspace.s_table);
2499         }
2500
2501         return accum;
2502 }
2503
2504 MODULE_AUTHOR("Ben Fennema");
2505 MODULE_DESCRIPTION("Universal Disk Format Filesystem");
2506 MODULE_LICENSE("GPL");
2507 module_init(init_udf_fs)
2508 module_exit(exit_udf_fs)