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/smp_lock.h>
  52 #include <linux/buffer_head.h>
  53 #include <linux/vfs.h>
  54 #include <linux/vmalloc.h>
  55 #include <linux/errno.h>
  56 #include <linux/mount.h>
  57 #include <linux/seq_file.h>
  58 #include <linux/bitmap.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 <asm/uaccess.h>
  66
  67 #define VDS_POS_PRIMARY_VOL_DESC        0
  68 #define VDS_POS_UNALLOC_SPACE_DESC      1
  69 #define VDS_POS_LOGICAL_VOL_DESC        2
  70 #define VDS_POS_PARTITION_DESC          3
  71 #define VDS_POS_IMP_USE_VOL_DESC        4
  72 #define VDS_POS_VOL_DESC_PTR            5
  73 #define VDS_POS_TERMINATING_DESC        6
  74 #define VDS_POS_LENGTH                  7
  75
  76 #define UDF_DEFAULT_BLOCKSIZE 2048
  77
  78 static char error_buf[1024];
  79
  80 /* These are the "meat" - everything else is stuffing */
  81 static int udf_fill_super(struct super_block *, void *, int);
  82 static void udf_put_super(struct super_block *);
  83 static void udf_write_super(struct super_block *);
  84 static int udf_remount_fs(struct super_block *, int *, char *);
  85 static int udf_check_valid(struct super_block *, int, int);
  86 static int udf_vrs(struct super_block *sb, int silent);
  87 static void udf_load_logicalvolint(struct super_block *, kernel_extent_ad);
  88 static void udf_find_anchor(struct super_block *);
  89 static int udf_find_fileset(struct super_block *, kernel_lb_addr *,
  90                             kernel_lb_addr *);
  91 static void udf_load_fileset(struct super_block *, struct buffer_head *,
  92                              kernel_lb_addr *);
  93 static void udf_open_lvid(struct super_block *);
  94 static void udf_close_lvid(struct super_block *);
  95 static unsigned int udf_count_free(struct super_block *);
  96 static int udf_statfs(struct dentry *, struct kstatfs *);
  97 static int udf_show_options(struct seq_file *, struct vfsmount *);
  98 static void udf_error(struct super_block *sb, const char *function,
  99                       const char *fmt, ...);
 100
 101 struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct udf_sb_info *sbi)
 102 {
 103         struct logicalVolIntegrityDesc *lvid =
 104                 (struct logicalVolIntegrityDesc *)sbi->s_lvid_bh->b_data;
 105         __u32 number_of_partitions = le32_to_cpu(lvid->numOfPartitions);
 106         __u32 offset = number_of_partitions * 2 *
 107                                 sizeof(uint32_t)/sizeof(uint8_t);
 108         return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
 109 }
 110
 111 /* UDF filesystem type */
 112 static int udf_get_sb(struct file_system_type *fs_type,
 113                       int flags, const char *dev_name, void *data,
 114                       struct vfsmount *mnt)
 115 {
 116         return get_sb_bdev(fs_type, flags, dev_name, data, udf_fill_super, mnt);
 117 }
 118
 119 static struct file_system_type udf_fstype = {
 120         .owner          = THIS_MODULE,
 121         .name           = "udf",
 122         .get_sb         = udf_get_sb,
 123         .kill_sb        = kill_block_super,
 124         .fs_flags       = FS_REQUIRES_DEV,
 125 };
 126
 127 static struct kmem_cache *udf_inode_cachep;
 128
 129 static struct inode *udf_alloc_inode(struct super_block *sb)
 130 {
 131         struct udf_inode_info *ei;
 132         ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
 133         if (!ei)
 134                 return NULL;
 135
 136         ei->i_unique = 0;
 137         ei->i_lenExtents = 0;
 138         ei->i_next_alloc_block = 0;
 139         ei->i_next_alloc_goal = 0;
 140         ei->i_strat4096 = 0;
 141
 142         return &ei->vfs_inode;
 143 }
 144
 145 static void udf_destroy_inode(struct inode *inode)
 146 {
 147         kmem_cache_free(udf_inode_cachep, UDF_I(inode));
 148 }
 149
 150 static void init_once(struct kmem_cache *cachep, void *foo)
 151 {
 152         struct udf_inode_info *ei = (struct udf_inode_info *)foo;
 153
 154         ei->i_ext.i_data = NULL;
 155         inode_init_once(&ei->vfs_inode);
 156 }
 157
 158 static int init_inodecache(void)
 159 {
 160         udf_inode_cachep = kmem_cache_create("udf_inode_cache",
 161                                              sizeof(struct udf_inode_info),
 162                                              0, (SLAB_RECLAIM_ACCOUNT |
 163                                                  SLAB_MEM_SPREAD),
 164                                              init_once);
 165         if (!udf_inode_cachep)
 166                 return -ENOMEM;
 167         return 0;
 168 }
 169
 170 static void destroy_inodecache(void)
 171 {
 172         kmem_cache_destroy(udf_inode_cachep);
 173 }
 174
 175 /* Superblock operations */
 176 static const struct super_operations udf_sb_ops = {
 177         .alloc_inode    = udf_alloc_inode,
 178         .destroy_inode  = udf_destroy_inode,
 179         .write_inode    = udf_write_inode,
 180         .delete_inode   = udf_delete_inode,
 181         .clear_inode    = udf_clear_inode,
 182         .put_super      = udf_put_super,
 183         .write_super    = udf_write_super,
 184         .statfs         = udf_statfs,
 185         .remount_fs     = udf_remount_fs,
 186         .show_options   = udf_show_options,
 187 };
 188
 189 struct udf_options {
 190         unsigned char novrs;
 191         unsigned int blocksize;
 192         unsigned int session;
 193         unsigned int lastblock;
 194         unsigned int anchor;
 195         unsigned int volume;
 196         unsigned short partition;
 197         unsigned int fileset;
 198         unsigned int rootdir;
 199         unsigned int flags;
 200         mode_t umask;
 201         gid_t gid;
 202         uid_t uid;
 203         struct nls_table *nls_map;
 204 };
 205
 206 static int __init init_udf_fs(void)
 207 {
 208         int err;
 209
 210         err = init_inodecache();
 211         if (err)
 212                 goto out1;
 213         err = register_filesystem(&udf_fstype);
 214         if (err)
 215                 goto out;
 216
 217         return 0;
 218
 219 out:
 220         destroy_inodecache();
 221
 222 out1:
 223         return err;
 224 }
 225
 226 static void __exit exit_udf_fs(void)
 227 {
 228         unregister_filesystem(&udf_fstype);
 229         destroy_inodecache();
 230 }
 231
 232 module_init(init_udf_fs)
 233 module_exit(exit_udf_fs)
 234
 235 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
 236 {
 237         struct udf_sb_info *sbi = UDF_SB(sb);
 238
 239         sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map),
 240                                   GFP_KERNEL);
 241         if (!sbi->s_partmaps) {
 242                 udf_error(sb, __FUNCTION__,
 243                           "Unable to allocate space for %d partition maps",
 244                           count);
 245                 sbi->s_partitions = 0;
 246                 return -ENOMEM;
 247         }
 248
 249         sbi->s_partitions = count;
 250         return 0;
 251 }
 252
 253 static int udf_show_options(struct seq_file *seq, struct vfsmount *mnt)
 254 {
 255         struct super_block *sb = mnt->mnt_sb;
 256         struct udf_sb_info *sbi = UDF_SB(sb);
 257
 258         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
 259                 seq_puts(seq, ",nostrict");
 260         if (sb->s_blocksize != UDF_DEFAULT_BLOCKSIZE)
 261                 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
 262         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
 263                 seq_puts(seq, ",unhide");
 264         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
 265                 seq_puts(seq, ",undelete");
 266         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
 267                 seq_puts(seq, ",noadinicb");
 268         if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
 269                 seq_puts(seq, ",shortad");
 270         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
 271                 seq_puts(seq, ",uid=forget");
 272         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_IGNORE))
 273                 seq_puts(seq, ",uid=ignore");
 274         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
 275                 seq_puts(seq, ",gid=forget");
 276         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE))
 277                 seq_puts(seq, ",gid=ignore");
 278         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
 279                 seq_printf(seq, ",uid=%u", sbi->s_uid);
 280         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
 281                 seq_printf(seq, ",gid=%u", sbi->s_gid);
 282         if (sbi->s_umask != 0)
 283                 seq_printf(seq, ",umask=%o", sbi->s_umask);
 284         if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
 285                 seq_printf(seq, ",session=%u", sbi->s_session);
 286         if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
 287                 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
 288         /*
 289          * s_anchor[2] could be zeroed out in case there is no anchor
 290          * in the specified block, but then the "anchor=N" option
 291          * originally given by the user wasn't effective, so it's OK
 292          * if we don't show it.
 293          */
 294         if (sbi->s_anchor[2] != 0)
 295                 seq_printf(seq, ",anchor=%u", sbi->s_anchor[2]);
 296         /*
 297          * volume, partition, fileset and rootdir seem to be ignored
 298          * currently
 299          */
 300         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
 301                 seq_puts(seq, ",utf8");
 302         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
 303                 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
 304
 305         return 0;
 306 }
 307
 308 /*
 309  * udf_parse_options
 310  *
 311  * PURPOSE
 312  *      Parse mount options.
 313  *
 314  * DESCRIPTION
 315  *      The following mount options are supported:
 316  *
 317  *      gid=            Set the default group.
 318  *      umask=          Set the default umask.
 319  *      uid=            Set the default user.
 320  *      bs=             Set the block size.
 321  *      unhide          Show otherwise hidden files.
 322  *      undelete        Show deleted files in lists.
 323  *      adinicb         Embed data in the inode (default)
 324  *      noadinicb       Don't embed data in the inode
 325  *      shortad         Use short ad's
 326  *      longad          Use long ad's (default)
 327  *      nostrict        Unset strict conformance
 328  *      iocharset=      Set the NLS character set
 329  *
 330  *      The remaining are for debugging and disaster recovery:
 331  *
 332  *      novrs           Skip volume sequence recognition
 333  *
 334  *      The following expect a offset from 0.
 335  *
 336  *      session=        Set the CDROM session (default= last session)
 337  *      anchor=         Override standard anchor location. (default= 256)
 338  *      volume=         Override the VolumeDesc location. (unused)
 339  *      partition=      Override the PartitionDesc location. (unused)
 340  *      lastblock=      Set the last block of the filesystem/
 341  *
 342  *      The following expect a offset from the partition root.
 343  *
 344  *      fileset=        Override the fileset block location. (unused)
 345  *      rootdir=        Override the root directory location. (unused)
 346  *              WARNING: overriding the rootdir to a non-directory may
 347  *              yield highly unpredictable results.
 348  *
 349  * PRE-CONDITIONS
 350  *      options         Pointer to mount options string.
 351  *      uopts           Pointer to mount options variable.
 352  *
 353  * POST-CONDITIONS
 354  *      <return>        1       Mount options parsed okay.
 355  *      <return>        0       Error parsing mount options.
 356  *
 357  * HISTORY
 358  *      July 1, 1997 - Andrew E. Mileski
 359  *      Written, tested, and released.
 360  */
 361
 362 enum {
 363         Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
 364         Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
 365         Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
 366         Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
 367         Opt_rootdir, Opt_utf8, Opt_iocharset,
 368         Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore
 369 };
 370
 371 static match_table_t tokens = {
 372         {Opt_novrs,     "novrs"},
 373         {Opt_nostrict,  "nostrict"},
 374         {Opt_bs,        "bs=%u"},
 375         {Opt_unhide,    "unhide"},
 376         {Opt_undelete,  "undelete"},
 377         {Opt_noadinicb, "noadinicb"},
 378         {Opt_adinicb,   "adinicb"},
 379         {Opt_shortad,   "shortad"},
 380         {Opt_longad,    "longad"},
 381         {Opt_uforget,   "uid=forget"},
 382         {Opt_uignore,   "uid=ignore"},
 383         {Opt_gforget,   "gid=forget"},
 384         {Opt_gignore,   "gid=ignore"},
 385         {Opt_gid,       "gid=%u"},
 386         {Opt_uid,       "uid=%u"},
 387         {Opt_umask,     "umask=%o"},
 388         {Opt_session,   "session=%u"},
 389         {Opt_lastblock, "lastblock=%u"},
 390         {Opt_anchor,    "anchor=%u"},
 391         {Opt_volume,    "volume=%u"},
 392         {Opt_partition, "partition=%u"},
 393         {Opt_fileset,   "fileset=%u"},
 394         {Opt_rootdir,   "rootdir=%u"},
 395         {Opt_utf8,      "utf8"},
 396         {Opt_iocharset, "iocharset=%s"},
 397         {Opt_err,       NULL}
 398 };
 399
 400 static int udf_parse_options(char *options, struct udf_options *uopt,
 401                              bool remount)
 402 {
 403         char *p;
 404         int option;
 405
 406         uopt->novrs = 0;
 407         uopt->blocksize = UDF_DEFAULT_BLOCKSIZE;
 408         uopt->partition = 0xFFFF;
 409         uopt->session = 0xFFFFFFFF;
 410         uopt->lastblock = 0;
 411         uopt->anchor = 0;
 412         uopt->volume = 0xFFFFFFFF;
 413         uopt->rootdir = 0xFFFFFFFF;
 414         uopt->fileset = 0xFFFFFFFF;
 415         uopt->nls_map = NULL;
 416
 417         if (!options)
 418                 return 1;
 419
 420         while ((p = strsep(&options, ",")) != NULL) {
 421                 substring_t args[MAX_OPT_ARGS];
 422                 int token;
 423                 if (!*p)
 424                         continue;
 425
 426                 token = match_token(p, tokens, args);
 427                 switch (token) {
 428                 case Opt_novrs:
 429                         uopt->novrs = 1;
 430                 case Opt_bs:
 431                         if (match_int(&args[0], &option))
 432                                 return 0;
 433                         uopt->blocksize = option;
 434                         break;
 435                 case Opt_unhide:
 436                         uopt->flags |= (1 << UDF_FLAG_UNHIDE);
 437                         break;
 438                 case Opt_undelete:
 439                         uopt->flags |= (1 << UDF_FLAG_UNDELETE);
 440                         break;
 441                 case Opt_noadinicb:
 442                         uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
 443                         break;
 444                 case Opt_adinicb:
 445                         uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
 446                         break;
 447                 case Opt_shortad:
 448                         uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
 449                         break;
 450                 case Opt_longad:
 451                         uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
 452                         break;
 453                 case Opt_gid:
 454                         if (match_int(args, &option))
 455                                 return 0;
 456                         uopt->gid = option;
 457                         uopt->flags |= (1 << UDF_FLAG_GID_SET);
 458                         break;
 459                 case Opt_uid:
 460                         if (match_int(args, &option))
 461                                 return 0;
 462                         uopt->uid = option;
 463                         uopt->flags |= (1 << UDF_FLAG_UID_SET);
 464                         break;
 465                 case Opt_umask:
 466                         if (match_octal(args, &option))
 467                                 return 0;
 468                         uopt->umask = option;
 469                         break;
 470                 case Opt_nostrict:
 471                         uopt->flags &= ~(1 << UDF_FLAG_STRICT);
 472                         break;
 473                 case Opt_session:
 474                         if (match_int(args, &option))
 475                                 return 0;
 476                         uopt->session = option;
 477                         if (!remount)
 478                                 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
 479                         break;
 480                 case Opt_lastblock:
 481                         if (match_int(args, &option))
 482                                 return 0;
 483                         uopt->lastblock = option;
 484                         if (!remount)
 485                                 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
 486                         break;
 487                 case Opt_anchor:
 488                         if (match_int(args, &option))
 489                                 return 0;
 490                         uopt->anchor = option;
 491                         break;
 492                 case Opt_volume:
 493                         if (match_int(args, &option))
 494                                 return 0;
 495                         uopt->volume = option;
 496                         break;
 497                 case Opt_partition:
 498                         if (match_int(args, &option))
 499                                 return 0;
 500                         uopt->partition = option;
 501                         break;
 502                 case Opt_fileset:
 503                         if (match_int(args, &option))
 504                                 return 0;
 505                         uopt->fileset = option;
 506                         break;
 507                 case Opt_rootdir:
 508                         if (match_int(args, &option))
 509                                 return 0;
 510                         uopt->rootdir = option;
 511                         break;
 512                 case Opt_utf8:
 513                         uopt->flags |= (1 << UDF_FLAG_UTF8);
 514                         break;
 515 #ifdef CONFIG_UDF_NLS
 516                 case Opt_iocharset:
 517                         uopt->nls_map = load_nls(args[0].from);
 518                         uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
 519                         break;
 520 #endif
 521                 case Opt_uignore:
 522                         uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
 523                         break;
 524                 case Opt_uforget:
 525                         uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
 526                         break;
 527                 case Opt_gignore:
 528                         uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
 529                         break;
 530                 case Opt_gforget:
 531                         uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
 532                         break;
 533                 default:
 534                         printk(KERN_ERR "udf: bad mount option \"%s\" "
 535                                "or missing value\n", p);
 536                         return 0;
 537                 }
 538         }
 539         return 1;
 540 }
 541
 542 static void udf_write_super(struct super_block *sb)
 543 {
 544         lock_kernel();
 545
 546         if (!(sb->s_flags & MS_RDONLY))
 547                 udf_open_lvid(sb);
 548         sb->s_dirt = 0;
 549
 550         unlock_kernel();
 551 }
 552
 553 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
 554 {
 555         struct udf_options uopt;
 556         struct udf_sb_info *sbi = UDF_SB(sb);
 557
 558         uopt.flags = sbi->s_flags;
 559         uopt.uid   = sbi->s_uid;
 560         uopt.gid   = sbi->s_gid;
 561         uopt.umask = sbi->s_umask;
 562
 563         if (!udf_parse_options(options, &uopt, true))
 564                 return -EINVAL;
 565
 566         sbi->s_flags = uopt.flags;
 567         sbi->s_uid   = uopt.uid;
 568         sbi->s_gid   = uopt.gid;
 569         sbi->s_umask = uopt.umask;
 570
 571         if (sbi->s_lvid_bh) {
 572                 int write_rev = le16_to_cpu(udf_sb_lvidiu(sbi)->minUDFWriteRev);
 573                 if (write_rev > UDF_MAX_WRITE_VERSION)
 574                         *flags |= MS_RDONLY;
 575         }
 576
 577         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 578                 return 0;
 579         if (*flags & MS_RDONLY)
 580                 udf_close_lvid(sb);
 581         else
 582                 udf_open_lvid(sb);
 583
 584         return 0;
 585 }
 586
 587 static int udf_vrs(struct super_block *sb, int silent)
 588 {
 589         struct volStructDesc *vsd = NULL;
 590         int sector = 32768;
 591         int sectorsize;
 592         struct buffer_head *bh = NULL;
 593         int iso9660 = 0;
 594         int nsr02 = 0;
 595         int nsr03 = 0;
 596         struct udf_sb_info *sbi;
 597
 598         /* Block size must be a multiple of 512 */
 599         if (sb->s_blocksize & 511)
 600                 return 0;
 601         sbi = UDF_SB(sb);
 602
 603         if (sb->s_blocksize < sizeof(struct volStructDesc))
 604                 sectorsize = sizeof(struct volStructDesc);
 605         else
 606                 sectorsize = sb->s_blocksize;
 607
 608         sector += (sbi->s_session << sb->s_blocksize_bits);
 609
 610         udf_debug("Starting at sector %u (%ld byte sectors)\n",
 611                   (sector >> sb->s_blocksize_bits), sb->s_blocksize);
 612         /* Process the sequence (if applicable) */
 613         for (; !nsr02 && !nsr03; sector += sectorsize) {
 614                 /* Read a block */
 615                 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
 616                 if (!bh)
 617                         break;
 618
 619                 /* Look for ISO  descriptors */
 620                 vsd = (struct volStructDesc *)(bh->b_data +
 621                                               (sector & (sb->s_blocksize - 1)));
 622
 623                 if (vsd->stdIdent[0] == 0) {
 624                         brelse(bh);
 625                         break;
 626                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
 627                                     VSD_STD_ID_LEN)) {
 628                         iso9660 = sector;
 629                         switch (vsd->structType) {
 630                         case 0:
 631                                 udf_debug("ISO9660 Boot Record found\n");
 632                                 break;
 633                         case 1:
 634                                 udf_debug("ISO9660 Primary Volume Descriptor "
 635                                           "found\n");
 636                                 break;
 637                         case 2:
 638                                 udf_debug("ISO9660 Supplementary Volume "
 639                                           "Descriptor found\n");
 640                                 break;
 641                         case 3:
 642                                 udf_debug("ISO9660 Volume Partition Descriptor "
 643                                           "found\n");
 644                                 break;
 645                         case 255:
 646                                 udf_debug("ISO9660 Volume Descriptor Set "
 647                                           "Terminator found\n");
 648                                 break;
 649                         default:
 650                                 udf_debug("ISO9660 VRS (%u) found\n",
 651                                           vsd->structType);
 652                                 break;
 653                         }
 654                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
 655                                     VSD_STD_ID_LEN))
 656                         ; /* nothing */
 657                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
 658                                     VSD_STD_ID_LEN)) {
 659                         brelse(bh);
 660                         break;
 661                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
 662                                     VSD_STD_ID_LEN))
 663                         nsr02 = sector;
 664                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
 665                                     VSD_STD_ID_LEN))
 666                         nsr03 = sector;
 667                 brelse(bh);
 668         }
 669
 670         if (nsr03)
 671                 return nsr03;
 672         else if (nsr02)
 673                 return nsr02;
 674         else if (sector - (sbi->s_session << sb->s_blocksize_bits) == 32768)
 675                 return -1;
 676         else
 677                 return 0;
 678 }
 679
 680 /*
 681  * Check whether there is an anchor block in the given block
 682  */
 683 static int udf_check_anchor_block(struct super_block *sb, sector_t block,
 684                                         bool varconv)
 685 {
 686         struct buffer_head *bh = NULL;
 687         tag *t;
 688         uint16_t ident;
 689         uint32_t location;
 690
 691         if (varconv) {
 692                 if (udf_fixed_to_variable(block) >=
 693                     sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits)
 694                         return 0;
 695                 bh = sb_bread(sb, udf_fixed_to_variable(block));
 696         }
 697         else
 698                 bh = sb_bread(sb, block);
 699
 700         if (!bh)
 701                 return 0;
 702
 703         t = (tag *)bh->b_data;
 704         ident = le16_to_cpu(t->tagIdent);
 705         location = le32_to_cpu(t->tagLocation);
 706         brelse(bh);
 707         if (ident != TAG_IDENT_AVDP)
 708                 return 0;
 709         return location == block;
 710 }
 711
 712 /* Search for an anchor volume descriptor pointer */
 713 static sector_t udf_scan_anchors(struct super_block *sb, bool varconv,
 714                                         sector_t lastblock)
 715 {
 716         sector_t last[6];
 717         int i;
 718         struct udf_sb_info *sbi = UDF_SB(sb);
 719
 720         last[0] = lastblock;
 721         last[1] = last[0] - 1;
 722         last[2] = last[0] + 1;
 723         last[3] = last[0] - 2;
 724         last[4] = last[0] - 150;
 725         last[5] = last[0] - 152;
 726
 727         /*  according to spec, anchor is in either:
 728          *     block 256
 729          *     lastblock-256
 730          *     lastblock
 731          *  however, if the disc isn't closed, it could be 512 */
 732
 733         for (i = 0; i < ARRAY_SIZE(last); i++) {
 734                 if (last[i] < 0)
 735                         continue;
 736                 if (last[i] >= sb->s_bdev->bd_inode->i_size >>
 737                                 sb->s_blocksize_bits)
 738                         continue;
 739
 740                 if (udf_check_anchor_block(sb, last[i], varconv)) {
 741                         sbi->s_anchor[0] = last[i];
 742                         sbi->s_anchor[1] = last[i] - 256;
 743                         return last[i];
 744                 }
 745
 746                 if (last[i] < 256)
 747                         continue;
 748
 749                 if (udf_check_anchor_block(sb, last[i] - 256, varconv)) {
 750                         sbi->s_anchor[1] = last[i] - 256;
 751                         return last[i];
 752                 }
 753         }
 754
 755         if (udf_check_anchor_block(sb, sbi->s_session + 256, varconv)) {
 756                 sbi->s_anchor[0] = sbi->s_session + 256;
 757                 return last[0];
 758         }
 759         if (udf_check_anchor_block(sb, sbi->s_session + 512, varconv)) {
 760                 sbi->s_anchor[0] = sbi->s_session + 512;
 761                 return last[0];
 762         }
 763         return 0;
 764 }
 765
 766 /*
 767  * Find an anchor volume descriptor. The function expects sbi->s_lastblock to
 768  * be the last block on the media.
 769  *
 770  * Return 1 if not found, 0 if ok
 771  *
 772  */
 773 static void udf_find_anchor(struct super_block *sb)
 774 {
 775         sector_t lastblock;
 776         struct buffer_head *bh = NULL;
 777         uint16_t ident;
 778         int i;
 779         struct udf_sb_info *sbi = UDF_SB(sb);
 780
 781         lastblock = udf_scan_anchors(sb, 0, sbi->s_last_block);
 782         if (lastblock)
 783                 goto check_anchor;
 784
 785         /* No anchor found? Try VARCONV conversion of block numbers */
 786         /* Firstly, we try to not convert number of the last block */
 787         lastblock = udf_scan_anchors(sb, 1,
 788                                 udf_variable_to_fixed(sbi->s_last_block));
 789         if (lastblock) {
 790                 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
 791                 goto check_anchor;
 792         }
 793
 794         /* Secondly, we try with converted number of the last block */
 795         lastblock = udf_scan_anchors(sb, 1, sbi->s_last_block);
 796         if (lastblock)
 797                 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
 798
 799 check_anchor:
 800         /*
 801          * Check located anchors and the anchor block supplied via
 802          * mount options
 803          */
 804         for (i = 0; i < ARRAY_SIZE(sbi->s_anchor); i++) {
 805                 if (!sbi->s_anchor[i])
 806                         continue;
 807                 bh = udf_read_tagged(sb, sbi->s_anchor[i],
 808                                         sbi->s_anchor[i], &ident);
 809                 if (!bh)
 810                         sbi->s_anchor[i] = 0;
 811                 else {
 812                         brelse(bh);
 813                         if (ident != TAG_IDENT_AVDP)
 814                                 sbi->s_anchor[i] = 0;
 815                 }
 816         }
 817
 818         sbi->s_last_block = lastblock;
 819 }
 820
 821 static int udf_find_fileset(struct super_block *sb,
 822                             kernel_lb_addr *fileset,
 823                             kernel_lb_addr *root)
 824 {
 825         struct buffer_head *bh = NULL;
 826         long lastblock;
 827         uint16_t ident;
 828         struct udf_sb_info *sbi;
 829
 830         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
 831             fileset->partitionReferenceNum != 0xFFFF) {
 832                 bh = udf_read_ptagged(sb, *fileset, 0, &ident);
 833
 834                 if (!bh) {
 835                         return 1;
 836                 } else if (ident != TAG_IDENT_FSD) {
 837                         brelse(bh);
 838                         return 1;
 839                 }
 840
 841         }
 842
 843         sbi = UDF_SB(sb);
 844         if (!bh) {
 845                 /* Search backwards through the partitions */
 846                 kernel_lb_addr newfileset;
 847
 848 /* --> cvg: FIXME - is it reasonable? */
 849                 return 1;
 850
 851                 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
 852                      (newfileset.partitionReferenceNum != 0xFFFF &&
 853                       fileset->logicalBlockNum == 0xFFFFFFFF &&
 854                       fileset->partitionReferenceNum == 0xFFFF);
 855                      newfileset.partitionReferenceNum--) {
 856                         lastblock = sbi->s_partmaps
 857                                         [newfileset.partitionReferenceNum]
 858                                                 .s_partition_len;
 859                         newfileset.logicalBlockNum = 0;
 860
 861                         do {
 862                                 bh = udf_read_ptagged(sb, newfileset, 0,
 863                                                       &ident);
 864                                 if (!bh) {
 865                                         newfileset.logicalBlockNum++;
 866                                         continue;
 867                                 }
 868
 869                                 switch (ident) {
 870                                 case TAG_IDENT_SBD:
 871                                 {
 872                                         struct spaceBitmapDesc *sp;
 873                                         sp = (struct spaceBitmapDesc *)
 874                                                                 bh->b_data;
 875                                         newfileset.logicalBlockNum += 1 +
 876                                                 ((le32_to_cpu(sp->numOfBytes) +
 877                                                   sizeof(struct spaceBitmapDesc)
 878                                                   - 1) >> sb->s_blocksize_bits);
 879                                         brelse(bh);
 880                                         break;
 881                                 }
 882                                 case TAG_IDENT_FSD:
 883                                         *fileset = newfileset;
 884                                         break;
 885                                 default:
 886                                         newfileset.logicalBlockNum++;
 887                                         brelse(bh);
 888                                         bh = NULL;
 889                                         break;
 890                                 }
 891                         } while (newfileset.logicalBlockNum < lastblock &&
 892                                  fileset->logicalBlockNum == 0xFFFFFFFF &&
 893                                  fileset->partitionReferenceNum == 0xFFFF);
 894                 }
 895         }
 896
 897         if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
 898              fileset->partitionReferenceNum != 0xFFFF) && bh) {
 899                 udf_debug("Fileset at block=%d, partition=%d\n",
 900                           fileset->logicalBlockNum,
 901                           fileset->partitionReferenceNum);
 902
 903                 sbi->s_partition = fileset->partitionReferenceNum;
 904                 udf_load_fileset(sb, bh, root);
 905                 brelse(bh);
 906                 return 0;
 907         }
 908         return 1;
 909 }
 910
 911 static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
 912 {
 913         struct primaryVolDesc *pvoldesc;
 914         struct ustr instr;
 915         struct ustr outstr;
 916         struct buffer_head *bh;
 917         uint16_t ident;
 918
 919         bh = udf_read_tagged(sb, block, block, &ident);
 920         if (!bh)
 921                 return 1;
 922         BUG_ON(ident != TAG_IDENT_PVD);
 923
 924         pvoldesc = (struct primaryVolDesc *)bh->b_data;
 925
 926         if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
 927                               pvoldesc->recordingDateAndTime)) {
 928 #ifdef UDFFS_DEBUG
 929                 timestamp *ts = &pvoldesc->recordingDateAndTime;
 930                 udf_debug("recording time %04u/%02u/%02u"
 931                           " %02u:%02u (%x)\n",
 932                           le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
 933                           ts->minute, le16_to_cpu(ts->typeAndTimezone));
 934 #endif
 935         }
 936
 937         if (!udf_build_ustr(&instr, pvoldesc->volIdent, 32))
 938                 if (udf_CS0toUTF8(&outstr, &instr)) {
 939                         strncpy(UDF_SB(sb)->s_volume_ident, outstr.u_name,
 940                                 outstr.u_len > 31 ? 31 : outstr.u_len);
 941                         udf_debug("volIdent[] = '%s'\n",
 942                                         UDF_SB(sb)->s_volume_ident);
 943                 }
 944
 945         if (!udf_build_ustr(&instr, pvoldesc->volSetIdent, 128))
 946                 if (udf_CS0toUTF8(&outstr, &instr))
 947                         udf_debug("volSetIdent[] = '%s'\n", outstr.u_name);
 948
 949         brelse(bh);
 950         return 0;
 951 }
 952
 953 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
 954                              kernel_lb_addr *root)
 955 {
 956         struct fileSetDesc *fset;
 957
 958         fset = (struct fileSetDesc *)bh->b_data;
 959
 960         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
 961
 962         UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
 963
 964         udf_debug("Rootdir at block=%d, partition=%d\n",
 965                   root->logicalBlockNum, root->partitionReferenceNum);
 966 }
 967
 968 int udf_compute_nr_groups(struct super_block *sb, u32 partition)
 969 {
 970         struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
 971         return DIV_ROUND_UP(map->s_partition_len +
 972                             (sizeof(struct spaceBitmapDesc) << 3),
 973                             sb->s_blocksize * 8);
 974 }
 975
 976 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
 977 {
 978         struct udf_bitmap *bitmap;
 979         int nr_groups;
 980         int size;
 981
 982         nr_groups = udf_compute_nr_groups(sb, index);
 983         size = sizeof(struct udf_bitmap) +
 984                 (sizeof(struct buffer_head *) * nr_groups);
 985
 986         if (size <= PAGE_SIZE)
 987                 bitmap = kmalloc(size, GFP_KERNEL);
 988         else
 989                 bitmap = vmalloc(size); /* TODO: get rid of vmalloc */
 990
 991         if (bitmap == NULL) {
 992                 udf_error(sb, __FUNCTION__,
 993                           "Unable to allocate space for bitmap "
 994                           "and %d buffer_head pointers", nr_groups);
 995                 return NULL;
 996         }
 997
 998         memset(bitmap, 0x00, size);
 999         bitmap->s_block_bitmap = (struct buffer_head **)(bitmap + 1);
1000         bitmap->s_nr_groups = nr_groups;
1001         return bitmap;
1002 }
1003
1004 static int udf_fill_partdesc_info(struct super_block *sb,
1005                 struct partitionDesc *p, int p_index)
1006 {
1007         struct udf_part_map *map;
1008         struct udf_sb_info *sbi = UDF_SB(sb);
1009         struct partitionHeaderDesc *phd;
1010
1011         map = &sbi->s_partmaps[p_index];
1012
1013         map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
1014         map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
1015
1016         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
1017                 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
1018         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
1019                 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
1020         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
1021                 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
1022         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
1023                 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
1024
1025         udf_debug("Partition (%d:%d type %x) starts at physical %d, "
1026                   "block length %d\n", partitionNumber, p_index,
1027                   map->s_partition_type, map->s_partition_root,
1028                   map->s_partition_len);
1029
1030         if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1031             strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
1032                 return 0;
1033
1034         phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1035         if (phd->unallocSpaceTable.extLength) {
1036                 kernel_lb_addr loc = {
1037                         .logicalBlockNum = le32_to_cpu(
1038                                 phd->unallocSpaceTable.extPosition),
1039                         .partitionReferenceNum = p_index,
1040                 };
1041
1042                 map->s_uspace.s_table = udf_iget(sb, loc);
1043                 if (!map->s_uspace.s_table) {
1044                         udf_debug("cannot load unallocSpaceTable (part %d)\n",
1045                                         p_index);
1046                         return 1;
1047                 }
1048                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1049                 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
1050                                 p_index, map->s_uspace.s_table->i_ino);
1051         }
1052
1053         if (phd->unallocSpaceBitmap.extLength) {
1054                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1055                 if (!bitmap)
1056                         return 1;
1057                 map->s_uspace.s_bitmap = bitmap;
1058                 bitmap->s_extLength = le32_to_cpu(
1059                                 phd->unallocSpaceBitmap.extLength);
1060                 bitmap->s_extPosition = le32_to_cpu(
1061                                 phd->unallocSpaceBitmap.extPosition);
1062                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1063                 udf_debug("unallocSpaceBitmap (part %d) @ %d\n", p_index,
1064                                                 bitmap->s_extPosition);
1065         }
1066
1067         if (phd->partitionIntegrityTable.extLength)
1068                 udf_debug("partitionIntegrityTable (part %d)\n", p_index);
1069
1070         if (phd->freedSpaceTable.extLength) {
1071                 kernel_lb_addr loc = {
1072                         .logicalBlockNum = le32_to_cpu(
1073                                 phd->freedSpaceTable.extPosition),
1074                         .partitionReferenceNum = p_index,
1075                 };
1076
1077                 map->s_fspace.s_table = udf_iget(sb, loc);
1078                 if (!map->s_fspace.s_table) {
1079                         udf_debug("cannot load freedSpaceTable (part %d)\n",
1080                                 p_index);
1081                         return 1;
1082                 }
1083
1084                 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
1085                 udf_debug("freedSpaceTable (part %d) @ %ld\n",
1086                                 p_index, map->s_fspace.s_table->i_ino);
1087         }
1088
1089         if (phd->freedSpaceBitmap.extLength) {
1090                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1091                 if (!bitmap)
1092                         return 1;
1093                 map->s_fspace.s_bitmap = bitmap;
1094                 bitmap->s_extLength = le32_to_cpu(
1095                                 phd->freedSpaceBitmap.extLength);
1096                 bitmap->s_extPosition = le32_to_cpu(
1097                                 phd->freedSpaceBitmap.extPosition);
1098                 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1099                 udf_debug("freedSpaceBitmap (part %d) @ %d\n", p_index,
1100                                         bitmap->s_extPosition);
1101         }
1102         return 0;
1103 }
1104
1105 static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1106 {
1107         struct udf_sb_info *sbi = UDF_SB(sb);
1108         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1109         kernel_lb_addr ino;
1110         struct buffer_head *bh = NULL;
1111         struct udf_inode_info *vati;
1112         uint32_t pos;
1113         struct virtualAllocationTable20 *vat20;
1114
1115         /* VAT file entry is in the last recorded block */
1116         ino.partitionReferenceNum = type1_index;
1117         ino.logicalBlockNum = sbi->s_last_block - map->s_partition_root;
1118         sbi->s_vat_inode = udf_iget(sb, ino);
1119         if (!sbi->s_vat_inode)
1120                 return 1;
1121
1122         if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1123                 map->s_type_specific.s_virtual.s_start_offset =
1124                         udf_ext0_offset(sbi->s_vat_inode);
1125                 map->s_type_specific.s_virtual.s_num_entries =
1126                         (sbi->s_vat_inode->i_size - 36) >> 2;
1127         } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1128                 vati = UDF_I(sbi->s_vat_inode);
1129                 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1130                         pos = udf_block_map(sbi->s_vat_inode, 0);
1131                         bh = sb_bread(sb, pos);
1132                         if (!bh)
1133                                 return 1;
1134                         vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1135                 } else {
1136                         vat20 = (struct virtualAllocationTable20 *)
1137                                                         vati->i_ext.i_data;
1138                 }
1139
1140                 map->s_type_specific.s_virtual.s_start_offset =
1141                         le16_to_cpu(vat20->lengthHeader) +
1142                         udf_ext0_offset(sbi->s_vat_inode);
1143                 map->s_type_specific.s_virtual.s_num_entries =
1144                         (sbi->s_vat_inode->i_size -
1145                                 map->s_type_specific.s_virtual.
1146                                         s_start_offset) >> 2;
1147                 brelse(bh);
1148         }
1149         return 0;
1150 }
1151
1152 static int udf_load_partdesc(struct super_block *sb, sector_t block)
1153 {
1154         struct buffer_head *bh;
1155         struct partitionDesc *p;
1156         struct udf_part_map *map;
1157         struct udf_sb_info *sbi = UDF_SB(sb);
1158         int i, type1_idx;
1159         uint16_t partitionNumber;
1160         uint16_t ident;
1161         int ret = 0;
1162
1163         bh = udf_read_tagged(sb, block, block, &ident);
1164         if (!bh)
1165                 return 1;
1166         if (ident != TAG_IDENT_PD)
1167                 goto out_bh;
1168
1169         p = (struct partitionDesc *)bh->b_data;
1170         partitionNumber = le16_to_cpu(p->partitionNumber);
1171
1172         /* First scan for TYPE1 and SPARABLE partitions */
1173         for (i = 0; i < sbi->s_partitions; i++) {
1174                 map = &sbi->s_partmaps[i];
1175                 udf_debug("Searching map: (%d == %d)\n",
1176                           map->s_partition_num, partitionNumber);
1177                 if (map->s_partition_num == partitionNumber &&
1178                     (map->s_partition_type == UDF_TYPE1_MAP15 ||
1179                      map->s_partition_type == UDF_SPARABLE_MAP15))
1180                         break;
1181         }
1182
1183         if (i >= sbi->s_partitions) {
1184                 udf_debug("Partition (%d) not found in partition map\n",
1185                           partitionNumber);
1186                 goto out_bh;
1187         }
1188
1189         ret = udf_fill_partdesc_info(sb, p, i);
1190
1191         /*
1192          * Now rescan for VIRTUAL partitions when TYPE1 partitions are
1193          * already set up
1194          */
1195         type1_idx = i;
1196         for (i = 0; i < sbi->s_partitions; i++) {
1197                 map = &sbi->s_partmaps[i];
1198
1199                 if (map->s_partition_num == partitionNumber &&
1200                     (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1201                      map->s_partition_type == UDF_VIRTUAL_MAP20))
1202                         break;
1203         }
1204
1205         if (i >= sbi->s_partitions)
1206                 goto out_bh;
1207
1208         ret = udf_fill_partdesc_info(sb, p, i);
1209         if (ret)
1210                 goto out_bh;
1211         /*
1212          * Mark filesystem read-only if we have a partition with virtual map
1213          * since we don't handle writing to it (we overwrite blocks instead of
1214          * relocating them).
1215          */
1216         sb->s_flags |= MS_RDONLY;
1217         printk(KERN_NOTICE "UDF-fs: Filesystem marked read-only because "
1218                 "writing to pseudooverwrite partition is not implemented.\n");
1219
1220         ret = udf_load_vat(sb, i, type1_idx);
1221 out_bh:
1222         /* In case loading failed, we handle cleanup in udf_fill_super */
1223         brelse(bh);
1224         return ret;
1225 }
1226
1227 static int udf_load_logicalvol(struct super_block *sb, sector_t block,
1228                                kernel_lb_addr *fileset)
1229 {
1230         struct logicalVolDesc *lvd;
1231         int i, j, offset;
1232         uint8_t type;
1233         struct udf_sb_info *sbi = UDF_SB(sb);
1234         struct genericPartitionMap *gpm;
1235         uint16_t ident;
1236         struct buffer_head *bh;
1237         int ret = 0;
1238
1239         bh = udf_read_tagged(sb, block, block, &ident);
1240         if (!bh)
1241                 return 1;
1242         BUG_ON(ident != TAG_IDENT_LVD);
1243         lvd = (struct logicalVolDesc *)bh->b_data;
1244
1245         i = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1246         if (i != 0) {
1247                 ret = i;
1248                 goto out_bh;
1249         }
1250
1251         for (i = 0, offset = 0;
1252              i < sbi->s_partitions && offset < le32_to_cpu(lvd->mapTableLength);
1253              i++, offset += gpm->partitionMapLength) {
1254                 struct udf_part_map *map = &sbi->s_partmaps[i];
1255                 gpm = (struct genericPartitionMap *)
1256                                 &(lvd->partitionMaps[offset]);
1257                 type = gpm->partitionMapType;
1258                 if (type == 1) {
1259                         struct genericPartitionMap1 *gpm1 =
1260                                 (struct genericPartitionMap1 *)gpm;
1261                         map->s_partition_type = UDF_TYPE1_MAP15;
1262                         map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1263                         map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1264                         map->s_partition_func = NULL;
1265                 } else if (type == 2) {
1266                         struct udfPartitionMap2 *upm2 =
1267                                                 (struct udfPartitionMap2 *)gpm;
1268                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1269                                                 strlen(UDF_ID_VIRTUAL))) {
1270                                 u16 suf =
1271                                         le16_to_cpu(((__le16 *)upm2->partIdent.
1272                                                         identSuffix)[0]);
1273                                 if (suf < 0x0200) {
1274                                         map->s_partition_type =
1275                                                         UDF_VIRTUAL_MAP15;
1276                                         map->s_partition_func =
1277                                                         udf_get_pblock_virt15;
1278                                 } else {
1279                                         map->s_partition_type =
1280                                                         UDF_VIRTUAL_MAP20;
1281                                         map->s_partition_func =
1282                                                         udf_get_pblock_virt20;
1283                                 }
1284                         } else if (!strncmp(upm2->partIdent.ident,
1285                                                 UDF_ID_SPARABLE,
1286                                                 strlen(UDF_ID_SPARABLE))) {
1287                                 uint32_t loc;
1288                                 struct sparingTable *st;
1289                                 struct sparablePartitionMap *spm =
1290                                         (struct sparablePartitionMap *)gpm;
1291
1292                                 map->s_partition_type = UDF_SPARABLE_MAP15;
1293                                 map->s_type_specific.s_sparing.s_packet_len =
1294                                                 le16_to_cpu(spm->packetLength);
1295                                 for (j = 0; j < spm->numSparingTables; j++) {
1296                                         struct buffer_head *bh2;
1297
1298                                         loc = le32_to_cpu(
1299                                                 spm->locSparingTable[j]);
1300                                         bh2 = udf_read_tagged(sb, loc, loc,
1301                                                              &ident);
1302                                         map->s_type_specific.s_sparing.
1303                                                         s_spar_map[j] = bh2;
1304
1305                                         if (bh2 == NULL)
1306                                                 continue;
1307
1308                                         st = (struct sparingTable *)bh2->b_data;
1309                                         if (ident != 0 || strncmp(
1310                                                 st->sparingIdent.ident,
1311                                                 UDF_ID_SPARING,
1312                                                 strlen(UDF_ID_SPARING))) {
1313                                                 brelse(bh2);
1314                                                 map->s_type_specific.s_sparing.
1315                                                         s_spar_map[j] = NULL;
1316                                         }
1317                                 }
1318                                 map->s_partition_func = udf_get_pblock_spar15;
1319                         } else {
1320                                 udf_debug("Unknown ident: %s\n",
1321                                           upm2->partIdent.ident);
1322                                 continue;
1323                         }
1324                         map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1325                         map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1326                 }
1327                 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1328                           i, map->s_partition_num, type,
1329                           map->s_volumeseqnum);
1330         }
1331
1332         if (fileset) {
1333                 long_ad *la = (long_ad *)&(lvd->logicalVolContentsUse[0]);
1334
1335                 *fileset = lelb_to_cpu(la->extLocation);
1336                 udf_debug("FileSet found in LogicalVolDesc at block=%d, "
1337                           "partition=%d\n", fileset->logicalBlockNum,
1338                           fileset->partitionReferenceNum);
1339         }
1340         if (lvd->integritySeqExt.extLength)
1341                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1342
1343 out_bh:
1344         brelse(bh);
1345         return ret;
1346 }
1347
1348 /*
1349  * udf_load_logicalvolint
1350  *
1351  */
1352 static void udf_load_logicalvolint(struct super_block *sb, kernel_extent_ad loc)
1353 {
1354         struct buffer_head *bh = NULL;
1355         uint16_t ident;
1356         struct udf_sb_info *sbi = UDF_SB(sb);
1357         struct logicalVolIntegrityDesc *lvid;
1358
1359         while (loc.extLength > 0 &&
1360                (bh = udf_read_tagged(sb, loc.extLocation,
1361                                      loc.extLocation, &ident)) &&
1362                ident == TAG_IDENT_LVID) {
1363                 sbi->s_lvid_bh = bh;
1364                 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1365
1366                 if (lvid->nextIntegrityExt.extLength)
1367                         udf_load_logicalvolint(sb,
1368                                 leea_to_cpu(lvid->nextIntegrityExt));
1369
1370                 if (sbi->s_lvid_bh != bh)
1371                         brelse(bh);
1372                 loc.extLength -= sb->s_blocksize;
1373                 loc.extLocation++;
1374         }
1375         if (sbi->s_lvid_bh != bh)
1376                 brelse(bh);
1377 }
1378
1379 /*
1380  * udf_process_sequence
1381  *
1382  * PURPOSE
1383  *      Process a main/reserve volume descriptor sequence.
1384  *
1385  * PRE-CONDITIONS
1386  *      sb                      Pointer to _locked_ superblock.
1387  *      block                   First block of first extent of the sequence.
1388  *      lastblock               Lastblock of first extent of the sequence.
1389  *
1390  * HISTORY
1391  *      July 1, 1997 - Andrew E. Mileski
1392  *      Written, tested, and released.
1393  */
1394 static noinline int udf_process_sequence(struct super_block *sb, long block,
1395                                 long lastblock, kernel_lb_addr *fileset)
1396 {
1397         struct buffer_head *bh = NULL;
1398         struct udf_vds_record vds[VDS_POS_LENGTH];
1399         struct udf_vds_record *curr;
1400         struct generic_desc *gd;
1401         struct volDescPtr *vdp;
1402         int done = 0;
1403         uint32_t vdsn;
1404         uint16_t ident;
1405         long next_s = 0, next_e = 0;
1406
1407         memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1408
1409         /*
1410          * Read the main descriptor sequence and find which descriptors
1411          * are in it.
1412          */
1413         for (; (!done && block <= lastblock); block++) {
1414
1415                 bh = udf_read_tagged(sb, block, block, &ident);
1416                 if (!bh) {
1417                         printk(KERN_ERR "udf: Block %Lu of volume descriptor "
1418                                "sequence is corrupted or we could not read "
1419                                "it.\n", (unsigned long long)block);
1420                         return 1;
1421                 }
1422
1423                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1424                 gd = (struct generic_desc *)bh->b_data;
1425                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1426                 switch (ident) {
1427                 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1428                         curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1429                         if (vdsn >= curr->volDescSeqNum) {
1430                                 curr->volDescSeqNum = vdsn;
1431                                 curr->block = block;
1432                         }
1433                         break;
1434                 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1435                         curr = &vds[VDS_POS_VOL_DESC_PTR];
1436                         if (vdsn >= curr->volDescSeqNum) {
1437                                 curr->volDescSeqNum = vdsn;
1438                                 curr->block = block;
1439
1440                                 vdp = (struct volDescPtr *)bh->b_data;
1441                                 next_s = le32_to_cpu(
1442                                         vdp->nextVolDescSeqExt.extLocation);
1443                                 next_e = le32_to_cpu(
1444                                         vdp->nextVolDescSeqExt.extLength);
1445                                 next_e = next_e >> sb->s_blocksize_bits;
1446                                 next_e += next_s;
1447                         }
1448                         break;
1449                 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1450                         curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1451                         if (vdsn >= curr->volDescSeqNum) {
1452                                 curr->volDescSeqNum = vdsn;
1453                                 curr->block = block;
1454                         }
1455                         break;
1456                 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1457                         curr = &vds[VDS_POS_PARTITION_DESC];
1458                         if (!curr->block)
1459                                 curr->block = block;
1460                         break;
1461                 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1462                         curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1463                         if (vdsn >= curr->volDescSeqNum) {
1464                                 curr->volDescSeqNum = vdsn;
1465                                 curr->block = block;
1466                         }
1467                         break;
1468                 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1469                         curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1470                         if (vdsn >= curr->volDescSeqNum) {
1471                                 curr->volDescSeqNum = vdsn;
1472                                 curr->block = block;
1473                         }
1474                         break;
1475                 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1476                         vds[VDS_POS_TERMINATING_DESC].block = block;
1477                         if (next_e) {
1478                                 block = next_s;
1479                                 lastblock = next_e;
1480                                 next_s = next_e = 0;
1481                         } else
1482                                 done = 1;
1483                         break;
1484                 }
1485                 brelse(bh);
1486         }
1487         /*
1488          * Now read interesting descriptors again and process them
1489          * in a suitable order
1490          */
1491         if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1492                 printk(KERN_ERR "udf: Primary Volume Descriptor not found!\n");
1493                 return 1;
1494         }
1495         if (udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block))
1496                 return 1;
1497
1498         if (vds[VDS_POS_LOGICAL_VOL_DESC].block && udf_load_logicalvol(sb,
1499             vds[VDS_POS_LOGICAL_VOL_DESC].block, fileset))
1500                 return 1;
1501
1502         if (vds[VDS_POS_PARTITION_DESC].block) {
1503                 /*
1504                  * We rescan the whole descriptor sequence to find
1505                  * partition descriptor blocks and process them.
1506                  */
1507                 for (block = vds[VDS_POS_PARTITION_DESC].block;
1508                      block < vds[VDS_POS_TERMINATING_DESC].block;
1509                      block++)
1510                         if (udf_load_partdesc(sb, block))
1511                                 return 1;
1512         }
1513
1514         return 0;
1515 }
1516
1517 /*
1518  * udf_check_valid()
1519  */
1520 static int udf_check_valid(struct super_block *sb, int novrs, int silent)
1521 {
1522         long block;
1523         struct udf_sb_info *sbi = UDF_SB(sb);
1524
1525         if (novrs) {
1526                 udf_debug("Validity check skipped because of novrs option\n");
1527                 return 0;
1528         }
1529         /* Check that it is NSR02 compliant */
1530         /* Process any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
1531         block = udf_vrs(sb, silent);
1532         if (block == -1)
1533                 udf_debug("Failed to read byte 32768. Assuming open "
1534                           "disc. Skipping validity check\n");
1535         if (block && !sbi->s_last_block)
1536                 sbi->s_last_block = udf_get_last_block(sb);
1537         return !block;
1538 }
1539
1540 static int udf_load_sequence(struct super_block *sb, kernel_lb_addr *fileset)
1541 {
1542         struct anchorVolDescPtr *anchor;
1543         uint16_t ident;
1544         struct buffer_head *bh;
1545         long main_s, main_e, reserve_s, reserve_e;
1546         int i;
1547         struct udf_sb_info *sbi;
1548
1549         if (!sb)
1550                 return 1;
1551         sbi = UDF_SB(sb);
1552
1553         for (i = 0; i < ARRAY_SIZE(sbi->s_anchor); i++) {
1554                 if (!sbi->s_anchor[i])
1555                         continue;
1556
1557                 bh = udf_read_tagged(sb, sbi->s_anchor[i], sbi->s_anchor[i],
1558                                      &ident);
1559                 if (!bh)
1560                         continue;
1561
1562                 anchor = (struct anchorVolDescPtr *)bh->b_data;
1563
1564                 /* Locate the main sequence */
1565                 main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1566                 main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1567                 main_e = main_e >> sb->s_blocksize_bits;
1568                 main_e += main_s;
1569
1570                 /* Locate the reserve sequence */
1571                 reserve_s = le32_to_cpu(
1572                                 anchor->reserveVolDescSeqExt.extLocation);
1573                 reserve_e = le32_to_cpu(
1574                                 anchor->reserveVolDescSeqExt.extLength);
1575                 reserve_e = reserve_e >> sb->s_blocksize_bits;
1576                 reserve_e += reserve_s;
1577
1578                 brelse(bh);
1579
1580                 /* Process the main & reserve sequences */
1581                 /* responsible for finding the PartitionDesc(s) */
1582                 if (!(udf_process_sequence(sb, main_s, main_e,
1583                                            fileset) &&
1584                       udf_process_sequence(sb, reserve_s, reserve_e,
1585                                            fileset)))
1586                         break;
1587         }
1588
1589         if (i == ARRAY_SIZE(sbi->s_anchor)) {
1590                 udf_debug("No Anchor block found\n");
1591                 return 1;
1592         }
1593         udf_debug("Using anchor in block %d\n", sbi->s_anchor[i]);
1594
1595         return 0;
1596 }
1597
1598 static void udf_open_lvid(struct super_block *sb)
1599 {
1600         struct udf_sb_info *sbi = UDF_SB(sb);
1601         struct buffer_head *bh = sbi->s_lvid_bh;
1602         struct logicalVolIntegrityDesc *lvid;
1603         struct logicalVolIntegrityDescImpUse *lvidiu;
1604         if (!bh)
1605                 return;
1606
1607         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1608         lvidiu = udf_sb_lvidiu(sbi);
1609
1610         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1611         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1612         udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
1613                                 CURRENT_TIME);
1614         lvid->integrityType = LVID_INTEGRITY_TYPE_OPEN;
1615
1616         lvid->descTag.descCRC = cpu_to_le16(
1617                 udf_crc((char *)lvid + sizeof(tag),
1618                         le16_to_cpu(lvid->descTag.descCRCLength), 0));
1619
1620         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1621         mark_buffer_dirty(bh);
1622 }
1623
1624 static void udf_close_lvid(struct super_block *sb)
1625 {
1626         struct udf_sb_info *sbi = UDF_SB(sb);
1627         struct buffer_head *bh = sbi->s_lvid_bh;
1628         struct logicalVolIntegrityDesc *lvid;
1629         struct logicalVolIntegrityDescImpUse *lvidiu;
1630
1631         if (!bh)
1632                 return;
1633
1634         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1635
1636         if (lvid->integrityType != LVID_INTEGRITY_TYPE_OPEN)
1637                 return;
1638
1639         lvidiu = udf_sb_lvidiu(sbi);
1640         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1641         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1642         udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
1643         if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1644                 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1645         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1646                 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1647         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
1648                 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
1649         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1650
1651         lvid->descTag.descCRC = cpu_to_le16(
1652                 udf_crc((char *)lvid + sizeof(tag),
1653                         le16_to_cpu(lvid->descTag.descCRCLength),
1654                         0));
1655
1656         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1657         mark_buffer_dirty(bh);
1658 }
1659
1660 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
1661 {
1662         int i;
1663         int nr_groups = bitmap->s_nr_groups;
1664         int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
1665                                                 nr_groups);
1666
1667         for (i = 0; i < nr_groups; i++)
1668                 if (bitmap->s_block_bitmap[i])
1669                         brelse(bitmap->s_block_bitmap[i]);
1670
1671         if (size <= PAGE_SIZE)
1672                 kfree(bitmap);
1673         else
1674                 vfree(bitmap);
1675 }
1676
1677 static void udf_free_partition(struct udf_part_map *map)
1678 {
1679         int i;
1680
1681         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1682                 iput(map->s_uspace.s_table);
1683         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1684                 iput(map->s_fspace.s_table);
1685         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1686                 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
1687         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1688                 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
1689         if (map->s_partition_type == UDF_SPARABLE_MAP15)
1690                 for (i = 0; i < 4; i++)
1691                         brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
1692 }
1693
1694 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1695 {
1696         int i;
1697         struct inode *inode = NULL;
1698         struct udf_options uopt;
1699         kernel_lb_addr rootdir, fileset;
1700         struct udf_sb_info *sbi;
1701
1702         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1703         uopt.uid = -1;
1704         uopt.gid = -1;
1705         uopt.umask = 0;
1706
1707         sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1708         if (!sbi)
1709                 return -ENOMEM;
1710
1711         sb->s_fs_info = sbi;
1712
1713         mutex_init(&sbi->s_alloc_mutex);
1714
1715         if (!udf_parse_options((char *)options, &uopt, false))
1716                 goto error_out;
1717
1718         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1719             uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
1720                 udf_error(sb, "udf_read_super",
1721                           "utf8 cannot be combined with iocharset\n");
1722                 goto error_out;
1723         }
1724 #ifdef CONFIG_UDF_NLS
1725         if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1726                 uopt.nls_map = load_nls_default();
1727                 if (!uopt.nls_map)
1728                         uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1729                 else
1730                         udf_debug("Using default NLS map\n");
1731         }
1732 #endif
1733         if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1734                 uopt.flags |= (1 << UDF_FLAG_UTF8);
1735
1736         fileset.logicalBlockNum = 0xFFFFFFFF;
1737         fileset.partitionReferenceNum = 0xFFFF;
1738
1739         sbi->s_flags = uopt.flags;
1740         sbi->s_uid = uopt.uid;
1741         sbi->s_gid = uopt.gid;
1742         sbi->s_umask = uopt.umask;
1743         sbi->s_nls_map = uopt.nls_map;
1744
1745         /* Set the block size for all transfers */
1746         if (!sb_min_blocksize(sb, uopt.blocksize)) {
1747                 udf_debug("Bad block size (%d)\n", uopt.blocksize);
1748                 printk(KERN_ERR "udf: bad block size (%d)\n", uopt.blocksize);
1749                 goto error_out;
1750         }
1751
1752         if (uopt.session == 0xFFFFFFFF)
1753                 sbi->s_session = udf_get_last_session(sb);
1754         else
1755                 sbi->s_session = uopt.session;
1756
1757         udf_debug("Multi-session=%d\n", sbi->s_session);
1758
1759         sbi->s_last_block = uopt.lastblock;
1760         sbi->s_anchor[0] = sbi->s_anchor[1] = 0;
1761         sbi->s_anchor[2] = uopt.anchor;
1762
1763         if (udf_check_valid(sb, uopt.novrs, silent)) {
1764                 /* read volume recognition sequences */
1765                 printk(KERN_WARNING "UDF-fs: No VRS found\n");
1766                 goto error_out;
1767         }
1768
1769         udf_find_anchor(sb);
1770
1771         /* Fill in the rest of the superblock */
1772         sb->s_op = &udf_sb_ops;
1773         sb->dq_op = NULL;
1774         sb->s_dirt = 0;
1775         sb->s_magic = UDF_SUPER_MAGIC;
1776         sb->s_time_gran = 1000;
1777
1778         if (udf_load_sequence(sb, &fileset)) {
1779                 printk(KERN_WARNING "UDF-fs: No partition found (1)\n");
1780                 goto error_out;
1781         }
1782
1783         udf_debug("Lastblock=%d\n", sbi->s_last_block);
1784
1785         if (sbi->s_lvid_bh) {
1786                 struct logicalVolIntegrityDescImpUse *lvidiu =
1787                                                         udf_sb_lvidiu(sbi);
1788                 uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
1789                 uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
1790                 /* uint16_t maxUDFWriteRev =
1791                                 le16_to_cpu(lvidiu->maxUDFWriteRev); */
1792
1793                 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
1794                         printk(KERN_ERR "UDF-fs: minUDFReadRev=%x "
1795                                         "(max is %x)\n",
1796                                le16_to_cpu(lvidiu->minUDFReadRev),
1797                                UDF_MAX_READ_VERSION);
1798                         goto error_out;
1799                 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
1800                         sb->s_flags |= MS_RDONLY;
1801
1802                 sbi->s_udfrev = minUDFWriteRev;
1803
1804                 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1805                         UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
1806                 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
1807                         UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
1808         }
1809
1810         if (!sbi->s_partitions) {
1811                 printk(KERN_WARNING "UDF-fs: No partition found (2)\n");
1812                 goto error_out;
1813         }
1814
1815         if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
1816                         UDF_PART_FLAG_READ_ONLY) {
1817                 printk(KERN_NOTICE "UDF-fs: Partition marked readonly; "
1818                                    "forcing readonly mount\n");
1819                 sb->s_flags |= MS_RDONLY;
1820         }
1821
1822         if (udf_find_fileset(sb, &fileset, &rootdir)) {
1823                 printk(KERN_WARNING "UDF-fs: No fileset found\n");
1824                 goto error_out;
1825         }
1826
1827         if (!silent) {
1828                 timestamp ts;
1829                 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
1830                 udf_info("UDF: Mounting volume '%s', "
1831                          "timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
1832                          sbi->s_volume_ident, le16_to_cpu(ts.year), ts.month, ts.day,
1833                          ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
1834         }
1835         if (!(sb->s_flags & MS_RDONLY))
1836                 udf_open_lvid(sb);
1837
1838         /* Assign the root inode */
1839         /* assign inodes by physical block number */
1840         /* perhaps it's not extensible enough, but for now ... */
1841         inode = udf_iget(sb, rootdir);
1842         if (!inode) {
1843                 printk(KERN_ERR "UDF-fs: Error in udf_iget, block=%d, "
1844                                 "partition=%d\n",
1845                        rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
1846                 goto error_out;
1847         }
1848
1849         /* Allocate a dentry for the root inode */
1850         sb->s_root = d_alloc_root(inode);
1851         if (!sb->s_root) {
1852                 printk(KERN_ERR "UDF-fs: Couldn't allocate root dentry\n");
1853                 iput(inode);
1854                 goto error_out;
1855         }
1856         sb->s_maxbytes = MAX_LFS_FILESIZE;
1857         return 0;
1858
1859 error_out:
1860         if (sbi->s_vat_inode)
1861                 iput(sbi->s_vat_inode);
1862         if (sbi->s_partitions)
1863                 for (i = 0; i < sbi->s_partitions; i++)
1864                         udf_free_partition(&sbi->s_partmaps[i]);
1865 #ifdef CONFIG_UDF_NLS
1866         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1867                 unload_nls(sbi->s_nls_map);
1868 #endif
1869         if (!(sb->s_flags & MS_RDONLY))
1870                 udf_close_lvid(sb);
1871         brelse(sbi->s_lvid_bh);
1872
1873         kfree(sbi->s_partmaps);
1874         kfree(sbi);
1875         sb->s_fs_info = NULL;
1876
1877         return -EINVAL;
1878 }
1879
1880 static void udf_error(struct super_block *sb, const char *function,
1881                       const char *fmt, ...)
1882 {
1883         va_list args;
1884
1885         if (!(sb->s_flags & MS_RDONLY)) {
1886                 /* mark sb error */
1887                 sb->s_dirt = 1;
1888         }
1889         va_start(args, fmt);
1890         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1891         va_end(args);
1892         printk(KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
1893                 sb->s_id, function, error_buf);
1894 }
1895
1896 void udf_warning(struct super_block *sb, const char *function,
1897                  const char *fmt, ...)
1898 {
1899         va_list args;
1900
1901         va_start(args, fmt);
1902         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1903         va_end(args);
1904         printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
1905                sb->s_id, function, error_buf);
1906 }
1907
1908 static void udf_put_super(struct super_block *sb)
1909 {
1910         int i;
1911         struct udf_sb_info *sbi;
1912
1913         sbi = UDF_SB(sb);
1914         if (sbi->s_vat_inode)
1915                 iput(sbi->s_vat_inode);
1916         if (sbi->s_partitions)
1917                 for (i = 0; i < sbi->s_partitions; i++)
1918                         udf_free_partition(&sbi->s_partmaps[i]);
1919 #ifdef CONFIG_UDF_NLS
1920         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1921                 unload_nls(sbi->s_nls_map);
1922 #endif
1923         if (!(sb->s_flags & MS_RDONLY))
1924                 udf_close_lvid(sb);
1925         brelse(sbi->s_lvid_bh);
1926         kfree(sbi->s_partmaps);
1927         kfree(sb->s_fs_info);
1928         sb->s_fs_info = NULL;
1929 }
1930
1931 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
1932 {
1933         struct super_block *sb = dentry->d_sb;
1934         struct udf_sb_info *sbi = UDF_SB(sb);
1935         struct logicalVolIntegrityDescImpUse *lvidiu;
1936
1937         if (sbi->s_lvid_bh != NULL)
1938                 lvidiu = udf_sb_lvidiu(sbi);
1939         else
1940                 lvidiu = NULL;
1941
1942         buf->f_type = UDF_SUPER_MAGIC;
1943         buf->f_bsize = sb->s_blocksize;
1944         buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
1945         buf->f_bfree = udf_count_free(sb);
1946         buf->f_bavail = buf->f_bfree;
1947         buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
1948                                           le32_to_cpu(lvidiu->numDirs)) : 0)
1949                         + buf->f_bfree;
1950         buf->f_ffree = buf->f_bfree;
1951         /* __kernel_fsid_t f_fsid */
1952         buf->f_namelen = UDF_NAME_LEN - 2;
1953
1954         return 0;
1955 }
1956
1957 static unsigned int udf_count_free_bitmap(struct super_block *sb,
1958                                           struct udf_bitmap *bitmap)
1959 {
1960         struct buffer_head *bh = NULL;
1961         unsigned int accum = 0;
1962         int index;
1963         int block = 0, newblock;
1964         kernel_lb_addr loc;
1965         uint32_t bytes;
1966         uint8_t *ptr;
1967         uint16_t ident;
1968         struct spaceBitmapDesc *bm;
1969
1970         lock_kernel();
1971
1972         loc.logicalBlockNum = bitmap->s_extPosition;
1973         loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
1974         bh = udf_read_ptagged(sb, loc, 0, &ident);
1975
1976         if (!bh) {
1977                 printk(KERN_ERR "udf: udf_count_free failed\n");
1978                 goto out;
1979         } else if (ident != TAG_IDENT_SBD) {
1980                 brelse(bh);
1981                 printk(KERN_ERR "udf: udf_count_free failed\n");
1982                 goto out;
1983         }
1984
1985         bm = (struct spaceBitmapDesc *)bh->b_data;
1986         bytes = le32_to_cpu(bm->numOfBytes);
1987         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
1988         ptr = (uint8_t *)bh->b_data;
1989
1990         while (bytes > 0) {
1991                 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
1992                 accum += bitmap_weight((const unsigned long *)(ptr + index),
1993                                         cur_bytes * 8);
1994                 bytes -= cur_bytes;
1995                 if (bytes) {
1996                         brelse(bh);
1997                         newblock = udf_get_lb_pblock(sb, loc, ++block);
1998                         bh = udf_tread(sb, newblock);
1999                         if (!bh) {
2000                                 udf_debug("read failed\n");
2001                                 goto out;
2002                         }
2003                         index = 0;
2004                         ptr = (uint8_t *)bh->b_data;
2005                 }
2006         }
2007         brelse(bh);
2008
2009 out:
2010         unlock_kernel();
2011
2012         return accum;
2013 }
2014
2015 static unsigned int udf_count_free_table(struct super_block *sb,
2016                                          struct inode *table)
2017 {
2018         unsigned int accum = 0;
2019         uint32_t elen;
2020         kernel_lb_addr eloc;
2021         int8_t etype;
2022         struct extent_position epos;
2023
2024         lock_kernel();
2025
2026         epos.block = UDF_I(table)->i_location;
2027         epos.offset = sizeof(struct unallocSpaceEntry);
2028         epos.bh = NULL;
2029
2030         while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2031                 accum += (elen >> table->i_sb->s_blocksize_bits);
2032
2033         brelse(epos.bh);
2034
2035         unlock_kernel();
2036
2037         return accum;
2038 }
2039
2040 static unsigned int udf_count_free(struct super_block *sb)
2041 {
2042         unsigned int accum = 0;
2043         struct udf_sb_info *sbi;
2044         struct udf_part_map *map;
2045
2046         sbi = UDF_SB(sb);
2047         if (sbi->s_lvid_bh) {
2048                 struct logicalVolIntegrityDesc *lvid =
2049                         (struct logicalVolIntegrityDesc *)
2050                         sbi->s_lvid_bh->b_data;
2051                 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
2052                         accum = le32_to_cpu(
2053                                         lvid->freeSpaceTable[sbi->s_partition]);
2054                         if (accum == 0xFFFFFFFF)
2055                                 accum = 0;
2056                 }
2057         }
2058
2059         if (accum)
2060                 return accum;
2061
2062         map = &sbi->s_partmaps[sbi->s_partition];
2063         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2064                 accum += udf_count_free_bitmap(sb,
2065                                                map->s_uspace.s_bitmap);
2066         }
2067         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
2068                 accum += udf_count_free_bitmap(sb,
2069                                                map->s_fspace.s_bitmap);
2070         }
2071         if (accum)
2072                 return accum;
2073
2074         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2075                 accum += udf_count_free_table(sb,
2076                                               map->s_uspace.s_table);
2077         }
2078         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
2079                 accum += udf_count_free_table(sb,
2080                                               map->s_fspace.s_table);
2081         }
2082
2083         return accum;
2084 }