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   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 <asm/byteorder.h>
  57
  58 #include <linux/udf_fs.h>
  59 #include "udf_sb.h"
  60 #include "udf_i.h"
  61
  62 #include <linux/init.h>
  63 #include <asm/uaccess.h>
  64
  65 #define VDS_POS_PRIMARY_VOL_DESC        0
  66 #define VDS_POS_UNALLOC_SPACE_DESC      1
  67 #define VDS_POS_LOGICAL_VOL_DESC        2
  68 #define VDS_POS_PARTITION_DESC          3
  69 #define VDS_POS_IMP_USE_VOL_DESC        4
  70 #define VDS_POS_VOL_DESC_PTR            5
  71 #define VDS_POS_TERMINATING_DESC        6
  72 #define VDS_POS_LENGTH                  7
  73
  74 static char error_buf[1024];
  75
  76 /* These are the "meat" - everything else is stuffing */
  77 static int udf_fill_super(struct super_block *, void *, int);
  78 static void udf_put_super(struct super_block *);
  79 static void udf_write_super(struct super_block *);
  80 static int udf_remount_fs(struct super_block *, int *, char *);
  81 static int udf_check_valid(struct super_block *, int, int);
  82 static int udf_vrs(struct super_block *sb, int silent);
  83 static int udf_load_partition(struct super_block *, kernel_lb_addr *);
  84 static int udf_load_logicalvol(struct super_block *, struct buffer_head *,
  85                                kernel_lb_addr *);
  86 static void udf_load_logicalvolint(struct super_block *, kernel_extent_ad);
  87 static void udf_find_anchor(struct super_block *);
  88 static int udf_find_fileset(struct super_block *, kernel_lb_addr *,
  89                             kernel_lb_addr *);
  90 static void udf_load_pvoldesc(struct super_block *, struct buffer_head *);
  91 static void udf_load_fileset(struct super_block *, struct buffer_head *,
  92                              kernel_lb_addr *);
  93 static int udf_load_partdesc(struct super_block *, struct buffer_head *);
  94 static void udf_open_lvid(struct super_block *);
  95 static void udf_close_lvid(struct super_block *);
  96 static unsigned int udf_count_free(struct super_block *);
  97 static int udf_statfs(struct dentry *, struct kstatfs *);
  98
  99 struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct udf_sb_info *sbi)
 100 {
 101         struct logicalVolIntegrityDesc *lvid =
 102                 (struct logicalVolIntegrityDesc *)sbi->s_lvid_bh->b_data;
 103         __u32 number_of_partitions = le32_to_cpu(lvid->numOfPartitions);
 104         __u32 offset = number_of_partitions * 2 *
 105                                 sizeof(uint32_t)/sizeof(uint8_t);
 106         return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
 107 }
 108
 109 /* UDF filesystem type */
 110 static int udf_get_sb(struct file_system_type *fs_type,
 111                       int flags, const char *dev_name, void *data,
 112                       struct vfsmount *mnt)
 113 {
 114         return get_sb_bdev(fs_type, flags, dev_name, data, udf_fill_super, mnt);
 115 }
 116
 117 static struct file_system_type udf_fstype = {
 118         .owner          = THIS_MODULE,
 119         .name           = "udf",
 120         .get_sb         = udf_get_sb,
 121         .kill_sb        = kill_block_super,
 122         .fs_flags       = FS_REQUIRES_DEV,
 123 };
 124
 125 static struct kmem_cache *udf_inode_cachep;
 126
 127 static struct inode *udf_alloc_inode(struct super_block *sb)
 128 {
 129         struct udf_inode_info *ei;
 130         ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
 131         if (!ei)
 132                 return NULL;
 133
 134         ei->i_unique = 0;
 135         ei->i_lenExtents = 0;
 136         ei->i_next_alloc_block = 0;
 137         ei->i_next_alloc_goal = 0;
 138         ei->i_strat4096 = 0;
 139
 140         return &ei->vfs_inode;
 141 }
 142
 143 static void udf_destroy_inode(struct inode *inode)
 144 {
 145         kmem_cache_free(udf_inode_cachep, UDF_I(inode));
 146 }
 147
 148 static void init_once(struct kmem_cache *cachep, void *foo)
 149 {
 150         struct udf_inode_info *ei = (struct udf_inode_info *)foo;
 151
 152         ei->i_ext.i_data = NULL;
 153         inode_init_once(&ei->vfs_inode);
 154 }
 155
 156 static int init_inodecache(void)
 157 {
 158         udf_inode_cachep = kmem_cache_create("udf_inode_cache",
 159                                              sizeof(struct udf_inode_info),
 160                                              0, (SLAB_RECLAIM_ACCOUNT |
 161                                                  SLAB_MEM_SPREAD),
 162                                              init_once);
 163         if (!udf_inode_cachep)
 164                 return -ENOMEM;
 165         return 0;
 166 }
 167
 168 static void destroy_inodecache(void)
 169 {
 170         kmem_cache_destroy(udf_inode_cachep);
 171 }
 172
 173 /* Superblock operations */
 174 static const struct super_operations udf_sb_ops = {
 175         .alloc_inode    = udf_alloc_inode,
 176         .destroy_inode  = udf_destroy_inode,
 177         .write_inode    = udf_write_inode,
 178         .delete_inode   = udf_delete_inode,
 179         .clear_inode    = udf_clear_inode,
 180         .put_super      = udf_put_super,
 181         .write_super    = udf_write_super,
 182         .statfs         = udf_statfs,
 183         .remount_fs     = udf_remount_fs,
 184 };
 185
 186 struct udf_options {
 187         unsigned char novrs;
 188         unsigned int blocksize;
 189         unsigned int session;
 190         unsigned int lastblock;
 191         unsigned int anchor;
 192         unsigned int volume;
 193         unsigned short partition;
 194         unsigned int fileset;
 195         unsigned int rootdir;
 196         unsigned int flags;
 197         mode_t umask;
 198         gid_t gid;
 199         uid_t uid;
 200         struct nls_table *nls_map;
 201 };
 202
 203 static int __init init_udf_fs(void)
 204 {
 205         int err;
 206
 207         err = init_inodecache();
 208         if (err)
 209                 goto out1;
 210         err = register_filesystem(&udf_fstype);
 211         if (err)
 212                 goto out;
 213
 214         return 0;
 215
 216 out:
 217         destroy_inodecache();
 218
 219 out1:
 220         return err;
 221 }
 222
 223 static void __exit exit_udf_fs(void)
 224 {
 225         unregister_filesystem(&udf_fstype);
 226         destroy_inodecache();
 227 }
 228
 229 module_init(init_udf_fs)
 230 module_exit(exit_udf_fs)
 231
 232 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
 233 {
 234         struct udf_sb_info *sbi = UDF_SB(sb);
 235
 236         sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map),
 237                                   GFP_KERNEL);
 238         if (!sbi->s_partmaps) {
 239                 udf_error(sb, __FUNCTION__,
 240                           "Unable to allocate space for %d partition maps",
 241                           count);
 242                 sbi->s_partitions = 0;
 243                 return -ENOMEM;
 244         }
 245
 246         sbi->s_partitions = count;
 247         return 0;
 248 }
 249
 250 /*
 251  * udf_parse_options
 252  *
 253  * PURPOSE
 254  *      Parse mount options.
 255  *
 256  * DESCRIPTION
 257  *      The following mount options are supported:
 258  *
 259  *      gid=            Set the default group.
 260  *      umask=          Set the default umask.
 261  *      uid=            Set the default user.
 262  *      bs=             Set the block size.
 263  *      unhide          Show otherwise hidden files.
 264  *      undelete        Show deleted files in lists.
 265  *      adinicb         Embed data in the inode (default)
 266  *      noadinicb       Don't embed data in the inode
 267  *      shortad         Use short ad's
 268  *      longad          Use long ad's (default)
 269  *      nostrict        Unset strict conformance
 270  *      iocharset=      Set the NLS character set
 271  *
 272  *      The remaining are for debugging and disaster recovery:
 273  *
 274  *      novrs           Skip volume sequence recognition
 275  *
 276  *      The following expect a offset from 0.
 277  *
 278  *      session=        Set the CDROM session (default= last session)
 279  *      anchor=         Override standard anchor location. (default= 256)
 280  *      volume=         Override the VolumeDesc location. (unused)
 281  *      partition=      Override the PartitionDesc location. (unused)
 282  *      lastblock=      Set the last block of the filesystem/
 283  *
 284  *      The following expect a offset from the partition root.
 285  *
 286  *      fileset=        Override the fileset block location. (unused)
 287  *      rootdir=        Override the root directory location. (unused)
 288  *              WARNING: overriding the rootdir to a non-directory may
 289  *              yield highly unpredictable results.
 290  *
 291  * PRE-CONDITIONS
 292  *      options         Pointer to mount options string.
 293  *      uopts           Pointer to mount options variable.
 294  *
 295  * POST-CONDITIONS
 296  *      <return>        1       Mount options parsed okay.
 297  *      <return>        0       Error parsing mount options.
 298  *
 299  * HISTORY
 300  *      July 1, 1997 - Andrew E. Mileski
 301  *      Written, tested, and released.
 302  */
 303
 304 enum {
 305         Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
 306         Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
 307         Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
 308         Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
 309         Opt_rootdir, Opt_utf8, Opt_iocharset,
 310         Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore
 311 };
 312
 313 static match_table_t tokens = {
 314         {Opt_novrs,     "novrs"},
 315         {Opt_nostrict,  "nostrict"},
 316         {Opt_bs,        "bs=%u"},
 317         {Opt_unhide,    "unhide"},
 318         {Opt_undelete,  "undelete"},
 319         {Opt_noadinicb, "noadinicb"},
 320         {Opt_adinicb,   "adinicb"},
 321         {Opt_shortad,   "shortad"},
 322         {Opt_longad,    "longad"},
 323         {Opt_uforget,   "uid=forget"},
 324         {Opt_uignore,   "uid=ignore"},
 325         {Opt_gforget,   "gid=forget"},
 326         {Opt_gignore,   "gid=ignore"},
 327         {Opt_gid,       "gid=%u"},
 328         {Opt_uid,       "uid=%u"},
 329         {Opt_umask,     "umask=%o"},
 330         {Opt_session,   "session=%u"},
 331         {Opt_lastblock, "lastblock=%u"},
 332         {Opt_anchor,    "anchor=%u"},
 333         {Opt_volume,    "volume=%u"},
 334         {Opt_partition, "partition=%u"},
 335         {Opt_fileset,   "fileset=%u"},
 336         {Opt_rootdir,   "rootdir=%u"},
 337         {Opt_utf8,      "utf8"},
 338         {Opt_iocharset, "iocharset=%s"},
 339         {Opt_err,       NULL}
 340 };
 341
 342 static int udf_parse_options(char *options, struct udf_options *uopt)
 343 {
 344         char *p;
 345         int option;
 346
 347         uopt->novrs = 0;
 348         uopt->blocksize = 2048;
 349         uopt->partition = 0xFFFF;
 350         uopt->session = 0xFFFFFFFF;
 351         uopt->lastblock = 0;
 352         uopt->anchor = 0;
 353         uopt->volume = 0xFFFFFFFF;
 354         uopt->rootdir = 0xFFFFFFFF;
 355         uopt->fileset = 0xFFFFFFFF;
 356         uopt->nls_map = NULL;
 357
 358         if (!options)
 359                 return 1;
 360
 361         while ((p = strsep(&options, ",")) != NULL) {
 362                 substring_t args[MAX_OPT_ARGS];
 363                 int token;
 364                 if (!*p)
 365                         continue;
 366
 367                 token = match_token(p, tokens, args);
 368                 switch (token) {
 369                 case Opt_novrs:
 370                         uopt->novrs = 1;
 371                 case Opt_bs:
 372                         if (match_int(&args[0], &option))
 373                                 return 0;
 374                         uopt->blocksize = option;
 375                         break;
 376                 case Opt_unhide:
 377                         uopt->flags |= (1 << UDF_FLAG_UNHIDE);
 378                         break;
 379                 case Opt_undelete:
 380                         uopt->flags |= (1 << UDF_FLAG_UNDELETE);
 381                         break;
 382                 case Opt_noadinicb:
 383                         uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
 384                         break;
 385                 case Opt_adinicb:
 386                         uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
 387                         break;
 388                 case Opt_shortad:
 389                         uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
 390                         break;
 391                 case Opt_longad:
 392                         uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
 393                         break;
 394                 case Opt_gid:
 395                         if (match_int(args, &option))
 396                                 return 0;
 397                         uopt->gid = option;
 398                         uopt->flags |= (1 << UDF_FLAG_GID_SET);
 399                         break;
 400                 case Opt_uid:
 401                         if (match_int(args, &option))
 402                                 return 0;
 403                         uopt->uid = option;
 404                         uopt->flags |= (1 << UDF_FLAG_UID_SET);
 405                         break;
 406                 case Opt_umask:
 407                         if (match_octal(args, &option))
 408                                 return 0;
 409                         uopt->umask = option;
 410                         break;
 411                 case Opt_nostrict:
 412                         uopt->flags &= ~(1 << UDF_FLAG_STRICT);
 413                         break;
 414                 case Opt_session:
 415                         if (match_int(args, &option))
 416                                 return 0;
 417                         uopt->session = option;
 418                         break;
 419                 case Opt_lastblock:
 420                         if (match_int(args, &option))
 421                                 return 0;
 422                         uopt->lastblock = option;
 423                         break;
 424                 case Opt_anchor:
 425                         if (match_int(args, &option))
 426                                 return 0;
 427                         uopt->anchor = option;
 428                         break;
 429                 case Opt_volume:
 430                         if (match_int(args, &option))
 431                                 return 0;
 432                         uopt->volume = option;
 433                         break;
 434                 case Opt_partition:
 435                         if (match_int(args, &option))
 436                                 return 0;
 437                         uopt->partition = option;
 438                         break;
 439                 case Opt_fileset:
 440                         if (match_int(args, &option))
 441                                 return 0;
 442                         uopt->fileset = option;
 443                         break;
 444                 case Opt_rootdir:
 445                         if (match_int(args, &option))
 446                                 return 0;
 447                         uopt->rootdir = option;
 448                         break;
 449                 case Opt_utf8:
 450                         uopt->flags |= (1 << UDF_FLAG_UTF8);
 451                         break;
 452 #ifdef CONFIG_UDF_NLS
 453                 case Opt_iocharset:
 454                         uopt->nls_map = load_nls(args[0].from);
 455                         uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
 456                         break;
 457 #endif
 458                 case Opt_uignore:
 459                         uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
 460                         break;
 461                 case Opt_uforget:
 462                         uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
 463                         break;
 464                 case Opt_gignore:
 465                         uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
 466                         break;
 467                 case Opt_gforget:
 468                         uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
 469                         break;
 470                 default:
 471                         printk(KERN_ERR "udf: bad mount option \"%s\" "
 472                                "or missing value\n", p);
 473                         return 0;
 474                 }
 475         }
 476         return 1;
 477 }
 478
 479 static void udf_write_super(struct super_block *sb)
 480 {
 481         lock_kernel();
 482
 483         if (!(sb->s_flags & MS_RDONLY))
 484                 udf_open_lvid(sb);
 485         sb->s_dirt = 0;
 486
 487         unlock_kernel();
 488 }
 489
 490 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
 491 {
 492         struct udf_options uopt;
 493         struct udf_sb_info *sbi = UDF_SB(sb);
 494
 495         uopt.flags = sbi->s_flags;
 496         uopt.uid   = sbi->s_uid;
 497         uopt.gid   = sbi->s_gid;
 498         uopt.umask = sbi->s_umask;
 499
 500         if (!udf_parse_options(options, &uopt))
 501                 return -EINVAL;
 502
 503         sbi->s_flags = uopt.flags;
 504         sbi->s_uid   = uopt.uid;
 505         sbi->s_gid   = uopt.gid;
 506         sbi->s_umask = uopt.umask;
 507
 508         if (sbi->s_lvid_bh) {
 509                 int write_rev = le16_to_cpu(udf_sb_lvidiu(sbi)->minUDFWriteRev);
 510                 if (write_rev > UDF_MAX_WRITE_VERSION)
 511                         *flags |= MS_RDONLY;
 512         }
 513
 514         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 515                 return 0;
 516         if (*flags & MS_RDONLY)
 517                 udf_close_lvid(sb);
 518         else
 519                 udf_open_lvid(sb);
 520
 521         return 0;
 522 }
 523
 524 /*
 525  * udf_set_blocksize
 526  *
 527  * PURPOSE
 528  *      Set the block size to be used in all transfers.
 529  *
 530  * DESCRIPTION
 531  *      To allow room for a DMA transfer, it is best to guess big when unsure.
 532  *      This routine picks 2048 bytes as the blocksize when guessing. This
 533  *      should be adequate until devices with larger block sizes become common.
 534  *
 535  *      Note that the Linux kernel can currently only deal with blocksizes of
 536  *      512, 1024, 2048, 4096, and 8192 bytes.
 537  *
 538  * PRE-CONDITIONS
 539  *      sb                      Pointer to _locked_ superblock.
 540  *
 541  * POST-CONDITIONS
 542  *      sb->s_blocksize         Blocksize.
 543  *      sb->s_blocksize_bits    log2 of blocksize.
 544  *      <return>        0       Blocksize is valid.
 545  *      <return>        1       Blocksize is invalid.
 546  *
 547  * HISTORY
 548  *      July 1, 1997 - Andrew E. Mileski
 549  *      Written, tested, and released.
 550  */
 551 static int udf_set_blocksize(struct super_block *sb, int bsize)
 552 {
 553         if (!sb_min_blocksize(sb, bsize)) {
 554                 udf_debug("Bad block size (%d)\n", bsize);
 555                 printk(KERN_ERR "udf: bad block size (%d)\n", bsize);
 556                 return 0;
 557         }
 558
 559         return sb->s_blocksize;
 560 }
 561
 562 static int udf_vrs(struct super_block *sb, int silent)
 563 {
 564         struct volStructDesc *vsd = NULL;
 565         int sector = 32768;
 566         int sectorsize;
 567         struct buffer_head *bh = NULL;
 568         int iso9660 = 0;
 569         int nsr02 = 0;
 570         int nsr03 = 0;
 571         struct udf_sb_info *sbi;
 572
 573         /* Block size must be a multiple of 512 */
 574         if (sb->s_blocksize & 511)
 575                 return 0;
 576         sbi = UDF_SB(sb);
 577
 578         if (sb->s_blocksize < sizeof(struct volStructDesc))
 579                 sectorsize = sizeof(struct volStructDesc);
 580         else
 581                 sectorsize = sb->s_blocksize;
 582
 583         sector += (sbi->s_session << sb->s_blocksize_bits);
 584
 585         udf_debug("Starting at sector %u (%ld byte sectors)\n",
 586                   (sector >> sb->s_blocksize_bits), sb->s_blocksize);
 587         /* Process the sequence (if applicable) */
 588         for (; !nsr02 && !nsr03; sector += sectorsize) {
 589                 /* Read a block */
 590                 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
 591                 if (!bh)
 592                         break;
 593
 594                 /* Look for ISO  descriptors */
 595                 vsd = (struct volStructDesc *)(bh->b_data +
 596                                               (sector & (sb->s_blocksize - 1)));
 597
 598                 if (vsd->stdIdent[0] == 0) {
 599                         brelse(bh);
 600                         break;
 601                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
 602                                     VSD_STD_ID_LEN)) {
 603                         iso9660 = sector;
 604                         switch (vsd->structType) {
 605                         case 0:
 606                                 udf_debug("ISO9660 Boot Record found\n");
 607                                 break;
 608                         case 1:
 609                                 udf_debug("ISO9660 Primary Volume Descriptor "
 610                                           "found\n");
 611                                 break;
 612                         case 2:
 613                                 udf_debug("ISO9660 Supplementary Volume "
 614                                           "Descriptor found\n");
 615                                 break;
 616                         case 3:
 617                                 udf_debug("ISO9660 Volume Partition Descriptor "
 618                                           "found\n");
 619                                 break;
 620                         case 255:
 621                                 udf_debug("ISO9660 Volume Descriptor Set "
 622                                           "Terminator found\n");
 623                                 break;
 624                         default:
 625                                 udf_debug("ISO9660 VRS (%u) found\n",
 626                                           vsd->structType);
 627                                 break;
 628                         }
 629                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
 630                                     VSD_STD_ID_LEN))
 631                         ; /* nothing */
 632                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
 633                                     VSD_STD_ID_LEN)) {
 634                         brelse(bh);
 635                         break;
 636                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
 637                                     VSD_STD_ID_LEN))
 638                         nsr02 = sector;
 639                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
 640                                     VSD_STD_ID_LEN))
 641                         nsr03 = sector;
 642                 brelse(bh);
 643         }
 644
 645         if (nsr03)
 646                 return nsr03;
 647         else if (nsr02)
 648                 return nsr02;
 649         else if (sector - (sbi->s_session << sb->s_blocksize_bits) == 32768)
 650                 return -1;
 651         else
 652                 return 0;
 653 }
 654
 655 /*
 656  * udf_find_anchor
 657  *
 658  * PURPOSE
 659  *      Find an anchor volume descriptor.
 660  *
 661  * PRE-CONDITIONS
 662  *      sb                      Pointer to _locked_ superblock.
 663  *      lastblock               Last block on media.
 664  *
 665  * POST-CONDITIONS
 666  *      <return>                1 if not found, 0 if ok
 667  *
 668  * HISTORY
 669  *      July 1, 1997 - Andrew E. Mileski
 670  *      Written, tested, and released.
 671  */
 672 static void udf_find_anchor(struct super_block *sb)
 673 {
 674         int lastblock;
 675         struct buffer_head *bh = NULL;
 676         uint16_t ident;
 677         uint32_t location;
 678         int i;
 679         struct udf_sb_info *sbi;
 680
 681         sbi = UDF_SB(sb);
 682         lastblock = sbi->s_last_block;
 683
 684         if (lastblock) {
 685                 int varlastblock = udf_variable_to_fixed(lastblock);
 686                 int last[] =  { lastblock, lastblock - 2,
 687                                 lastblock - 150, lastblock - 152,
 688                                 varlastblock, varlastblock - 2,
 689                                 varlastblock - 150, varlastblock - 152 };
 690
 691                 lastblock = 0;
 692
 693                 /* Search for an anchor volume descriptor pointer */
 694
 695                 /*  according to spec, anchor is in either:
 696                  *     block 256
 697                  *     lastblock-256
 698                  *     lastblock
 699                  *  however, if the disc isn't closed, it could be 512 */
 700
 701                 for (i = 0; !lastblock && i < ARRAY_SIZE(last); i++) {
 702                         ident = location = 0;
 703                         if (last[i] >= 0) {
 704                                 bh = sb_bread(sb, last[i]);
 705                                 if (bh) {
 706                                         tag *t = (tag *)bh->b_data;
 707                                         ident = le16_to_cpu(t->tagIdent);
 708                                         location = le32_to_cpu(t->tagLocation);
 709                                         brelse(bh);
 710                                 }
 711                         }
 712
 713                         if (ident == TAG_IDENT_AVDP) {
 714                                 if (location == last[i] - sbi->s_session) {
 715                                         lastblock = last[i] - sbi->s_session;
 716                                         sbi->s_anchor[0] = lastblock;
 717                                         sbi->s_anchor[1] = lastblock - 256;
 718                                 } else if (location ==
 719                                                 udf_variable_to_fixed(last[i]) -
 720                                                         sbi->s_session) {
 721                                         UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
 722                                         lastblock =
 723                                                 udf_variable_to_fixed(last[i]) -
 724                                                         sbi->s_session;
 725                                         sbi->s_anchor[0] = lastblock;
 726                                         sbi->s_anchor[1] = lastblock - 256 -
 727                                                                 sbi->s_session;
 728                                 } else {
 729                                         udf_debug("Anchor found at block %d, "
 730                                                   "location mismatch %d.\n",
 731                                                   last[i], location);
 732                                 }
 733                         } else if (ident == TAG_IDENT_FE ||
 734                                         ident == TAG_IDENT_EFE) {
 735                                 lastblock = last[i];
 736                                 sbi->s_anchor[3] = 512;
 737                         } else {
 738                                 ident = location = 0;
 739                                 if (last[i] >= 256) {
 740                                         bh = sb_bread(sb, last[i] - 256);
 741                                         if (bh) {
 742                                                 tag *t = (tag *)bh->b_data;
 743                                                 ident = le16_to_cpu(
 744                                                                 t->tagIdent);
 745                                                 location = le32_to_cpu(
 746                                                                 t->tagLocation);
 747                                                 brelse(bh);
 748                                         }
 749                                 }
 750
 751                                 if (ident == TAG_IDENT_AVDP &&
 752                                     location == last[i] - 256 -
 753                                                 sbi->s_session) {
 754                                         lastblock = last[i];
 755                                         sbi->s_anchor[1] = last[i] - 256;
 756                                 } else {
 757                                         ident = location = 0;
 758                                         if (last[i] >= 312 + sbi->s_session) {
 759                                                 bh = sb_bread(sb,
 760                                                                 last[i] - 312 -
 761                                                                 sbi->s_session);
 762                                                 if (bh) {
 763                                                         tag *t = (tag *)
 764                                                                  bh->b_data;
 765                                                         ident = le16_to_cpu(
 766                                                                 t->tagIdent);
 767                                                         location = le32_to_cpu(
 768                                                                 t->tagLocation);
 769                                                         brelse(bh);
 770                                                 }
 771                                         }
 772
 773                                         if (ident == TAG_IDENT_AVDP &&
 774                                             location == udf_variable_to_fixed(last[i]) - 256) {
 775                                                 UDF_SET_FLAG(sb,
 776                                                              UDF_FLAG_VARCONV);
 777                                                 lastblock = udf_variable_to_fixed(last[i]);
 778                                                 sbi->s_anchor[1] = lastblock - 256;
 779                                         }
 780                                 }
 781                         }
 782                 }
 783         }
 784
 785         if (!lastblock) {
 786                 /* We haven't found the lastblock. check 312 */
 787                 bh = sb_bread(sb, 312 + sbi->s_session);
 788                 if (bh) {
 789                         tag *t = (tag *)bh->b_data;
 790                         ident = le16_to_cpu(t->tagIdent);
 791                         location = le32_to_cpu(t->tagLocation);
 792                         brelse(bh);
 793
 794                         if (ident == TAG_IDENT_AVDP && location == 256)
 795                                 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
 796                 }
 797         }
 798
 799         for (i = 0; i < ARRAY_SIZE(sbi->s_anchor); i++) {
 800                 if (sbi->s_anchor[i]) {
 801                         bh = udf_read_tagged(sb, sbi->s_anchor[i],
 802                                              sbi->s_anchor[i], &ident);
 803                         if (!bh)
 804                                 sbi->s_anchor[i] = 0;
 805                         else {
 806                                 brelse(bh);
 807                                 if ((ident != TAG_IDENT_AVDP) &&
 808                                     (i || (ident != TAG_IDENT_FE &&
 809                                            ident != TAG_IDENT_EFE)))
 810                                         sbi->s_anchor[i] = 0;
 811                         }
 812                 }
 813         }
 814
 815         sbi->s_last_block = lastblock;
 816 }
 817
 818 static int udf_find_fileset(struct super_block *sb,
 819                             kernel_lb_addr *fileset,
 820                             kernel_lb_addr *root)
 821 {
 822         struct buffer_head *bh = NULL;
 823         long lastblock;
 824         uint16_t ident;
 825         struct udf_sb_info *sbi;
 826
 827         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
 828             fileset->partitionReferenceNum != 0xFFFF) {
 829                 bh = udf_read_ptagged(sb, *fileset, 0, &ident);
 830
 831                 if (!bh) {
 832                         return 1;
 833                 } else if (ident != TAG_IDENT_FSD) {
 834                         brelse(bh);
 835                         return 1;
 836                 }
 837
 838         }
 839
 840         sbi = UDF_SB(sb);
 841         if (!bh) {
 842                 /* Search backwards through the partitions */
 843                 kernel_lb_addr newfileset;
 844
 845 /* --> cvg: FIXME - is it reasonable? */
 846                 return 1;
 847
 848                 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
 849                      (newfileset.partitionReferenceNum != 0xFFFF &&
 850                       fileset->logicalBlockNum == 0xFFFFFFFF &&
 851                       fileset->partitionReferenceNum == 0xFFFF);
 852                      newfileset.partitionReferenceNum--) {
 853                         lastblock = sbi->s_partmaps
 854                                         [newfileset.partitionReferenceNum]
 855                                                 .s_partition_len;
 856                         newfileset.logicalBlockNum = 0;
 857
 858                         do {
 859                                 bh = udf_read_ptagged(sb, newfileset, 0,
 860                                                       &ident);
 861                                 if (!bh) {
 862                                         newfileset.logicalBlockNum++;
 863                                         continue;
 864                                 }
 865
 866                                 switch (ident) {
 867                                 case TAG_IDENT_SBD:
 868                                 {
 869                                         struct spaceBitmapDesc *sp;
 870                                         sp = (struct spaceBitmapDesc *)
 871                                                                 bh->b_data;
 872                                         newfileset.logicalBlockNum += 1 +
 873                                                 ((le32_to_cpu(sp->numOfBytes) +
 874                                                   sizeof(struct spaceBitmapDesc)
 875                                                   - 1) >> sb->s_blocksize_bits);
 876                                         brelse(bh);
 877                                         break;
 878                                 }
 879                                 case TAG_IDENT_FSD:
 880                                         *fileset = newfileset;
 881                                         break;
 882                                 default:
 883                                         newfileset.logicalBlockNum++;
 884                                         brelse(bh);
 885                                         bh = NULL;
 886                                         break;
 887                                 }
 888                         } while (newfileset.logicalBlockNum < lastblock &&
 889                                  fileset->logicalBlockNum == 0xFFFFFFFF &&
 890                                  fileset->partitionReferenceNum == 0xFFFF);
 891                 }
 892         }
 893
 894         if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
 895              fileset->partitionReferenceNum != 0xFFFF) && bh) {
 896                 udf_debug("Fileset at block=%d, partition=%d\n",
 897                           fileset->logicalBlockNum,
 898                           fileset->partitionReferenceNum);
 899
 900                 sbi->s_partition = fileset->partitionReferenceNum;
 901                 udf_load_fileset(sb, bh, root);
 902                 brelse(bh);
 903                 return 0;
 904         }
 905         return 1;
 906 }
 907
 908 static void udf_load_pvoldesc(struct super_block *sb, struct buffer_head *bh)
 909 {
 910         struct primaryVolDesc *pvoldesc;
 911         time_t recording;
 912         long recording_usec;
 913         struct ustr instr;
 914         struct ustr outstr;
 915
 916         pvoldesc = (struct primaryVolDesc *)bh->b_data;
 917
 918         if (udf_stamp_to_time(&recording, &recording_usec,
 919                               lets_to_cpu(pvoldesc->recordingDateAndTime))) {
 920                 kernel_timestamp ts;
 921                 ts = lets_to_cpu(pvoldesc->recordingDateAndTime);
 922                 udf_debug("recording time %ld/%ld, %04u/%02u/%02u"
 923                           " %02u:%02u (%x)\n",
 924                           recording, recording_usec,
 925                           ts.year, ts.month, ts.day, ts.hour,
 926                           ts.minute, ts.typeAndTimezone);
 927                 UDF_SB(sb)->s_record_time.tv_sec = recording;
 928                 UDF_SB(sb)->s_record_time.tv_nsec = recording_usec * 1000;
 929         }
 930
 931         if (!udf_build_ustr(&instr, pvoldesc->volIdent, 32))
 932                 if (udf_CS0toUTF8(&outstr, &instr)) {
 933                         strncpy(UDF_SB(sb)->s_volume_ident, outstr.u_name,
 934                                 outstr.u_len > 31 ? 31 : outstr.u_len);
 935                         udf_debug("volIdent[] = '%s'\n",
 936                                         UDF_SB(sb)->s_volume_ident);
 937                 }
 938
 939         if (!udf_build_ustr(&instr, pvoldesc->volSetIdent, 128))
 940                 if (udf_CS0toUTF8(&outstr, &instr))
 941                         udf_debug("volSetIdent[] = '%s'\n", outstr.u_name);
 942 }
 943
 944 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
 945                              kernel_lb_addr *root)
 946 {
 947         struct fileSetDesc *fset;
 948
 949         fset = (struct fileSetDesc *)bh->b_data;
 950
 951         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
 952
 953         UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
 954
 955         udf_debug("Rootdir at block=%d, partition=%d\n",
 956                   root->logicalBlockNum, root->partitionReferenceNum);
 957 }
 958
 959 int udf_compute_nr_groups(struct super_block *sb, u32 partition)
 960 {
 961         struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
 962         return (map->s_partition_len +
 963                 (sizeof(struct spaceBitmapDesc) << 3) +
 964                 (sb->s_blocksize * 8) - 1) /
 965                 (sb->s_blocksize * 8);
 966 }
 967
 968 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
 969 {
 970         struct udf_bitmap *bitmap;
 971         int nr_groups;
 972         int size;
 973
 974         nr_groups = udf_compute_nr_groups(sb, index);
 975         size = sizeof(struct udf_bitmap) +
 976                 (sizeof(struct buffer_head *) * nr_groups);
 977
 978         if (size <= PAGE_SIZE)
 979                 bitmap = kmalloc(size, GFP_KERNEL);
 980         else
 981                 bitmap = vmalloc(size); /* TODO: get rid of vmalloc */
 982
 983         if (bitmap == NULL) {
 984                 udf_error(sb, __FUNCTION__,
 985                           "Unable to allocate space for bitmap "
 986                           "and %d buffer_head pointers", nr_groups);
 987                 return NULL;
 988         }
 989
 990         memset(bitmap, 0x00, size);
 991         bitmap->s_block_bitmap = (struct buffer_head **)(bitmap + 1);
 992         bitmap->s_nr_groups = nr_groups;
 993         return bitmap;
 994 }
 995
 996 static int udf_load_partdesc(struct super_block *sb, struct buffer_head *bh)
 997 {
 998         struct partitionDesc *p;
 999         int i;
1000         struct udf_part_map *map;
1001         struct udf_sb_info *sbi;
1002
1003         p = (struct partitionDesc *)bh->b_data;
1004         sbi = UDF_SB(sb);
1005
1006         for (i = 0; i < sbi->s_partitions; i++) {
1007                 map = &sbi->s_partmaps[i];
1008                 udf_debug("Searching map: (%d == %d)\n",
1009                           map->s_partition_num,
1010                           le16_to_cpu(p->partitionNumber));
1011                 if (map->s_partition_num ==
1012                                 le16_to_cpu(p->partitionNumber)) {
1013                         map->s_partition_len =
1014                                 le32_to_cpu(p->partitionLength); /* blocks */
1015                         map->s_partition_root =
1016                                 le32_to_cpu(p->partitionStartingLocation);
1017                         if (p->accessType ==
1018                                         cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
1019                                 map->s_partition_flags |=
1020                                                 UDF_PART_FLAG_READ_ONLY;
1021                         if (p->accessType ==
1022                                         cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
1023                                 map->s_partition_flags |=
1024                                                 UDF_PART_FLAG_WRITE_ONCE;
1025                         if (p->accessType ==
1026                                         cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
1027                                 map->s_partition_flags |=
1028                                                 UDF_PART_FLAG_REWRITABLE;
1029                         if (p->accessType ==
1030                                     cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
1031                                 map->s_partition_flags |=
1032                                                 UDF_PART_FLAG_OVERWRITABLE;
1033
1034                         if (!strcmp(p->partitionContents.ident,
1035                                     PD_PARTITION_CONTENTS_NSR02) ||
1036                             !strcmp(p->partitionContents.ident,
1037                                     PD_PARTITION_CONTENTS_NSR03)) {
1038                                 struct partitionHeaderDesc *phd;
1039
1040                                 phd = (struct partitionHeaderDesc *)
1041                                                 (p->partitionContentsUse);
1042                                 if (phd->unallocSpaceTable.extLength) {
1043                                         kernel_lb_addr loc = {
1044                                                 .logicalBlockNum = le32_to_cpu(phd->unallocSpaceTable.extPosition),
1045                                                 .partitionReferenceNum = i,
1046                                         };
1047
1048                                         map->s_uspace.s_table =
1049                                                 udf_iget(sb, loc);
1050                                         if (!map->s_uspace.s_table) {
1051                                                 udf_debug("cannot load unallocSpaceTable (part %d)\n", i);
1052                                                 return 1;
1053                                         }
1054                                         map->s_partition_flags |=
1055                                                 UDF_PART_FLAG_UNALLOC_TABLE;
1056                                         udf_debug("unallocSpaceTable (part %d) @ %ld\n",
1057                                                   i, map->s_uspace.s_table->i_ino);
1058                                 }
1059                                 if (phd->unallocSpaceBitmap.extLength) {
1060                                         struct udf_bitmap *bitmap =
1061                                                 udf_sb_alloc_bitmap(sb, i);
1062                                         map->s_uspace.s_bitmap = bitmap;
1063                                         if (bitmap != NULL) {
1064                                                 bitmap->s_extLength =
1065                                                         le32_to_cpu(phd->unallocSpaceBitmap.extLength);
1066                                                 bitmap->s_extPosition =
1067                                                         le32_to_cpu(phd->unallocSpaceBitmap.extPosition);
1068                                                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1069                                                 udf_debug("unallocSpaceBitmap (part %d) @ %d\n",
1070                                                           i, bitmap->s_extPosition);
1071                                         }
1072                                 }
1073                                 if (phd->partitionIntegrityTable.extLength)
1074                                         udf_debug("partitionIntegrityTable (part %d)\n", i);
1075                                 if (phd->freedSpaceTable.extLength) {
1076                                         kernel_lb_addr loc = {
1077                                                 .logicalBlockNum = le32_to_cpu(phd->freedSpaceTable.extPosition),
1078                                                 .partitionReferenceNum = i,
1079                                         };
1080
1081                                         map->s_fspace.s_table =
1082                                                 udf_iget(sb, loc);
1083                                         if (!map->s_fspace.s_table) {
1084                                                 udf_debug("cannot load freedSpaceTable (part %d)\n", i);
1085                                                 return 1;
1086                                         }
1087                                         map->s_partition_flags |=
1088                                                 UDF_PART_FLAG_FREED_TABLE;
1089                                         udf_debug("freedSpaceTable (part %d) @ %ld\n",
1090                                                   i, map->s_fspace.s_table->i_ino);
1091                                 }
1092                                 if (phd->freedSpaceBitmap.extLength) {
1093                                         struct udf_bitmap *bitmap =
1094                                                 udf_sb_alloc_bitmap(sb, i);
1095                                         map->s_fspace.s_bitmap = bitmap;
1096                                         if (bitmap != NULL) {
1097                                                 bitmap->s_extLength =
1098                                                         le32_to_cpu(phd->freedSpaceBitmap.extLength);
1099                                                 bitmap->s_extPosition =
1100                                                         le32_to_cpu(phd->freedSpaceBitmap.extPosition);
1101                                                 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1102                                                 udf_debug("freedSpaceBitmap (part %d) @ %d\n",
1103                                                           i, bitmap->s_extPosition);
1104                                         }
1105                                 }
1106                         }
1107                         break;
1108                 }
1109         }
1110         if (i == sbi->s_partitions)
1111                 udf_debug("Partition (%d) not found in partition map\n",
1112                           le16_to_cpu(p->partitionNumber));
1113         else
1114                 udf_debug("Partition (%d:%d type %x) starts at physical %d, "
1115                           "block length %d\n",
1116                           le16_to_cpu(p->partitionNumber), i,
1117                           map->s_partition_type,
1118                           map->s_partition_root,
1119                           map->s_partition_len);
1120         return 0;
1121 }
1122
1123 static int udf_load_logicalvol(struct super_block *sb, struct buffer_head *bh,
1124                                kernel_lb_addr *fileset)
1125 {
1126         struct logicalVolDesc *lvd;
1127         int i, j, offset;
1128         uint8_t type;
1129         struct udf_sb_info *sbi = UDF_SB(sb);
1130         struct genericPartitionMap *gpm;
1131
1132         lvd = (struct logicalVolDesc *)bh->b_data;
1133
1134         i = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1135         if (i != 0)
1136                 return i;
1137
1138         for (i = 0, offset = 0;
1139              i < sbi->s_partitions && offset < le32_to_cpu(lvd->mapTableLength);
1140              i++, offset += gpm->partitionMapLength) {
1141                 struct udf_part_map *map = &sbi->s_partmaps[i];
1142                 gpm = (struct genericPartitionMap *)
1143                                 &(lvd->partitionMaps[offset]);
1144                 type = gpm->partitionMapType;
1145                 if (type == 1) {
1146                         struct genericPartitionMap1 *gpm1 =
1147                                 (struct genericPartitionMap1 *)gpm;
1148                         map->s_partition_type = UDF_TYPE1_MAP15;
1149                         map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1150                         map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1151                         map->s_partition_func = NULL;
1152                 } else if (type == 2) {
1153                         struct udfPartitionMap2 *upm2 =
1154                                                 (struct udfPartitionMap2 *)gpm;
1155                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1156                                                 strlen(UDF_ID_VIRTUAL))) {
1157                                 u16 suf =
1158                                         le16_to_cpu(((__le16 *)upm2->partIdent.
1159                                                         identSuffix)[0]);
1160                                 if (suf == 0x0150) {
1161                                         map->s_partition_type =
1162                                                         UDF_VIRTUAL_MAP15;
1163                                         map->s_partition_func =
1164                                                         udf_get_pblock_virt15;
1165                                 } else if (suf == 0x0200) {
1166                                         map->s_partition_type =
1167                                                         UDF_VIRTUAL_MAP20;
1168                                         map->s_partition_func =
1169                                                         udf_get_pblock_virt20;
1170                                 }
1171                         } else if (!strncmp(upm2->partIdent.ident,
1172                                                 UDF_ID_SPARABLE,
1173                                                 strlen(UDF_ID_SPARABLE))) {
1174                                 uint32_t loc;
1175                                 uint16_t ident;
1176                                 struct sparingTable *st;
1177                                 struct sparablePartitionMap *spm =
1178                                         (struct sparablePartitionMap *)gpm;
1179
1180                                 map->s_partition_type = UDF_SPARABLE_MAP15;
1181                                 map->s_type_specific.s_sparing.s_packet_len =
1182                                                 le16_to_cpu(spm->packetLength);
1183                                 for (j = 0; j < spm->numSparingTables; j++) {
1184                                         struct buffer_head *bh2;
1185
1186                                         loc = le32_to_cpu(
1187                                                 spm->locSparingTable[j]);
1188                                         bh2 = udf_read_tagged(sb, loc, loc,
1189                                                              &ident);
1190                                         map->s_type_specific.s_sparing.
1191                                                         s_spar_map[j] = bh2;
1192
1193                                         if (bh2 != NULL) {
1194                                                 st = (struct sparingTable *)
1195                                                                 bh2->b_data;
1196                                                 if (ident != 0 || strncmp(
1197                                                         st->sparingIdent.ident,
1198                                                         UDF_ID_SPARING,
1199                                                         strlen(UDF_ID_SPARING))) {
1200                                                         brelse(bh2);
1201                                                         map->s_type_specific.
1202                                                                 s_sparing.
1203                                                                 s_spar_map[j] =
1204                                                                         NULL;
1205                                                 }
1206                                         }
1207                                 }
1208                                 map->s_partition_func = udf_get_pblock_spar15;
1209                         } else {
1210                                 udf_debug("Unknown ident: %s\n",
1211                                           upm2->partIdent.ident);
1212                                 continue;
1213                         }
1214                         map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1215                         map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1216                 }
1217                 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1218                           i, map->s_partition_num, type,
1219                           map->s_volumeseqnum);
1220         }
1221
1222         if (fileset) {
1223                 long_ad *la = (long_ad *)&(lvd->logicalVolContentsUse[0]);
1224
1225                 *fileset = lelb_to_cpu(la->extLocation);
1226                 udf_debug("FileSet found in LogicalVolDesc at block=%d, "
1227                           "partition=%d\n", fileset->logicalBlockNum,
1228                           fileset->partitionReferenceNum);
1229         }
1230         if (lvd->integritySeqExt.extLength)
1231                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1232
1233         return 0;
1234 }
1235
1236 /*
1237  * udf_load_logicalvolint
1238  *
1239  */
1240 static void udf_load_logicalvolint(struct super_block *sb, kernel_extent_ad loc)
1241 {
1242         struct buffer_head *bh = NULL;
1243         uint16_t ident;
1244         struct udf_sb_info *sbi = UDF_SB(sb);
1245         struct logicalVolIntegrityDesc *lvid;
1246
1247         while (loc.extLength > 0 &&
1248                (bh = udf_read_tagged(sb, loc.extLocation,
1249                                      loc.extLocation, &ident)) &&
1250                ident == TAG_IDENT_LVID) {
1251                 sbi->s_lvid_bh = bh;
1252                 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1253
1254                 if (lvid->nextIntegrityExt.extLength)
1255                         udf_load_logicalvolint(sb,
1256                                 leea_to_cpu(lvid->nextIntegrityExt));
1257
1258                 if (sbi->s_lvid_bh != bh)
1259                         brelse(bh);
1260                 loc.extLength -= sb->s_blocksize;
1261                 loc.extLocation++;
1262         }
1263         if (sbi->s_lvid_bh != bh)
1264                 brelse(bh);
1265 }
1266
1267 /*
1268  * udf_process_sequence
1269  *
1270  * PURPOSE
1271  *      Process a main/reserve volume descriptor sequence.
1272  *
1273  * PRE-CONDITIONS
1274  *      sb                      Pointer to _locked_ superblock.
1275  *      block                   First block of first extent of the sequence.
1276  *      lastblock               Lastblock of first extent of the sequence.
1277  *
1278  * HISTORY
1279  *      July 1, 1997 - Andrew E. Mileski
1280  *      Written, tested, and released.
1281  */
1282 static int udf_process_sequence(struct super_block *sb, long block,
1283                                 long lastblock, kernel_lb_addr *fileset)
1284 {
1285         struct buffer_head *bh = NULL;
1286         struct udf_vds_record vds[VDS_POS_LENGTH];
1287         struct udf_vds_record *curr;
1288         struct generic_desc *gd;
1289         struct volDescPtr *vdp;
1290         int done = 0;
1291         int i, j;
1292         uint32_t vdsn;
1293         uint16_t ident;
1294         long next_s = 0, next_e = 0;
1295
1296         memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1297
1298         /* Read the main descriptor sequence */
1299         for (; (!done && block <= lastblock); block++) {
1300
1301                 bh = udf_read_tagged(sb, block, block, &ident);
1302                 if (!bh)
1303                         break;
1304
1305                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1306                 gd = (struct generic_desc *)bh->b_data;
1307                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1308                 switch (ident) {
1309                 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1310                         curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1311                         if (vdsn >= curr->volDescSeqNum) {
1312                                 curr->volDescSeqNum = vdsn;
1313                                 curr->block = block;
1314                         }
1315                         break;
1316                 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1317                         curr = &vds[VDS_POS_VOL_DESC_PTR];
1318                         if (vdsn >= curr->volDescSeqNum) {
1319                                 curr->volDescSeqNum = vdsn;
1320                                 curr->block = block;
1321
1322                                 vdp = (struct volDescPtr *)bh->b_data;
1323                                 next_s = le32_to_cpu(
1324                                         vdp->nextVolDescSeqExt.extLocation);
1325                                 next_e = le32_to_cpu(
1326                                         vdp->nextVolDescSeqExt.extLength);
1327                                 next_e = next_e >> sb->s_blocksize_bits;
1328                                 next_e += next_s;
1329                         }
1330                         break;
1331                 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1332                         curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1333                         if (vdsn >= curr->volDescSeqNum) {
1334                                 curr->volDescSeqNum = vdsn;
1335                                 curr->block = block;
1336                         }
1337                         break;
1338                 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1339                         curr = &vds[VDS_POS_PARTITION_DESC];
1340                         if (!curr->block)
1341                                 curr->block = block;
1342                         break;
1343                 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1344                         curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1345                         if (vdsn >= curr->volDescSeqNum) {
1346                                 curr->volDescSeqNum = vdsn;
1347                                 curr->block = block;
1348                         }
1349                         break;
1350                 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1351                         curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1352                         if (vdsn >= curr->volDescSeqNum) {
1353                                 curr->volDescSeqNum = vdsn;
1354                                 curr->block = block;
1355                         }
1356                         break;
1357                 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1358                         vds[VDS_POS_TERMINATING_DESC].block = block;
1359                         if (next_e) {
1360                                 block = next_s;
1361                                 lastblock = next_e;
1362                                 next_s = next_e = 0;
1363                         } else
1364                                 done = 1;
1365                         break;
1366                 }
1367                 brelse(bh);
1368         }
1369         for (i = 0; i < VDS_POS_LENGTH; i++) {
1370                 if (vds[i].block) {
1371                         bh = udf_read_tagged(sb, vds[i].block, vds[i].block,
1372                                              &ident);
1373
1374                         if (i == VDS_POS_PRIMARY_VOL_DESC) {
1375                                 udf_load_pvoldesc(sb, bh);
1376                         } else if (i == VDS_POS_LOGICAL_VOL_DESC) {
1377                                 if (udf_load_logicalvol(sb, bh, fileset)) {
1378                                         brelse(bh);
1379                                         return 1;
1380                                 }
1381                         } else if (i == VDS_POS_PARTITION_DESC) {
1382                                 struct buffer_head *bh2 = NULL;
1383                                 if (udf_load_partdesc(sb, bh)) {
1384                                         brelse(bh);
1385                                         return 1;
1386                                 }
1387                                 for (j = vds[i].block + 1;
1388                                      j <  vds[VDS_POS_TERMINATING_DESC].block;
1389                                      j++) {
1390                                         bh2 = udf_read_tagged(sb, j, j, &ident);
1391                                         gd = (struct generic_desc *)bh2->b_data;
1392                                         if (ident == TAG_IDENT_PD)
1393                                                 if (udf_load_partdesc(sb,
1394                                                                       bh2)) {
1395                                                         brelse(bh);
1396                                                         brelse(bh2);
1397                                                         return 1;
1398                                                 }
1399                                         brelse(bh2);
1400                                 }
1401                         }
1402                         brelse(bh);
1403                 }
1404         }
1405
1406         return 0;
1407 }
1408
1409 /*
1410  * udf_check_valid()
1411  */
1412 static int udf_check_valid(struct super_block *sb, int novrs, int silent)
1413 {
1414         long block;
1415
1416         if (novrs) {
1417                 udf_debug("Validity check skipped because of novrs option\n");
1418                 return 0;
1419         }
1420         /* Check that it is NSR02 compliant */
1421         /* Process any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
1422         else {
1423                 block = udf_vrs(sb, silent);
1424                 if (block == -1) {
1425                         struct udf_sb_info *sbi = UDF_SB(sb);
1426                         udf_debug("Failed to read byte 32768. Assuming open "
1427                                   "disc. Skipping validity check\n");
1428                         if (!sbi->s_last_block)
1429                                 sbi->s_last_block = udf_get_last_block(sb);
1430                         return 0;
1431                 } else
1432                         return !block;
1433         }
1434 }
1435
1436 static int udf_load_partition(struct super_block *sb, kernel_lb_addr *fileset)
1437 {
1438         struct anchorVolDescPtr *anchor;
1439         uint16_t ident;
1440         struct buffer_head *bh;
1441         long main_s, main_e, reserve_s, reserve_e;
1442         int i, j;
1443         struct udf_sb_info *sbi;
1444
1445         if (!sb)
1446                 return 1;
1447         sbi = UDF_SB(sb);
1448
1449         for (i = 0; i < ARRAY_SIZE(sbi->s_anchor); i++) {
1450                 if (sbi->s_anchor[i] &&
1451                     (bh = udf_read_tagged(sb, sbi->s_anchor[i],
1452                                           sbi->s_anchor[i], &ident))) {
1453                         anchor = (struct anchorVolDescPtr *)bh->b_data;
1454
1455                         /* Locate the main sequence */
1456                         main_s = le32_to_cpu(
1457                                         anchor->mainVolDescSeqExt.extLocation);
1458                         main_e = le32_to_cpu(
1459                                         anchor->mainVolDescSeqExt.extLength);
1460                         main_e = main_e >> sb->s_blocksize_bits;
1461                         main_e += main_s;
1462
1463                         /* Locate the reserve sequence */
1464                         reserve_s = le32_to_cpu(
1465                                 anchor->reserveVolDescSeqExt.extLocation);
1466                         reserve_e = le32_to_cpu(
1467                                 anchor->reserveVolDescSeqExt.extLength);
1468                         reserve_e = reserve_e >> sb->s_blocksize_bits;
1469                         reserve_e += reserve_s;
1470
1471                         brelse(bh);
1472
1473                         /* Process the main & reserve sequences */
1474                         /* responsible for finding the PartitionDesc(s) */
1475                         if (!(udf_process_sequence(sb, main_s, main_e,
1476                                                    fileset) &&
1477                               udf_process_sequence(sb, reserve_s, reserve_e,
1478                                                    fileset)))
1479                                 break;
1480                 }
1481         }
1482
1483         if (i == ARRAY_SIZE(sbi->s_anchor)) {
1484                 udf_debug("No Anchor block found\n");
1485                 return 1;
1486         } else
1487                 udf_debug("Using anchor in block %d\n", sbi->s_anchor[i]);
1488
1489         for (i = 0; i < sbi->s_partitions; i++) {
1490                 kernel_lb_addr uninitialized_var(ino);
1491                 struct udf_part_map *map = &sbi->s_partmaps[i];
1492                 switch (map->s_partition_type) {
1493                 case UDF_VIRTUAL_MAP15:
1494                 case UDF_VIRTUAL_MAP20:
1495                         if (!sbi->s_last_block) {
1496                                 sbi->s_last_block = udf_get_last_block(sb);
1497                                 udf_find_anchor(sb);
1498                         }
1499
1500                         if (!sbi->s_last_block) {
1501                                 udf_debug("Unable to determine Lastblock (For "
1502                                           "Virtual Partition)\n");
1503                                 return 1;
1504                         }
1505
1506                         for (j = 0; j < sbi->s_partitions; j++) {
1507                                 struct udf_part_map *map2 = &sbi->s_partmaps[j];
1508                                 if (j != i &&
1509                                     map->s_volumeseqnum ==
1510                                                 map2->s_volumeseqnum &&
1511                                     map->s_partition_num ==
1512                                                 map2->s_partition_num) {
1513                                         ino.partitionReferenceNum = j;
1514                                         ino.logicalBlockNum =
1515                                                 sbi->s_last_block -
1516                                                         map2->s_partition_root;
1517                                         break;
1518                                 }
1519                         }
1520
1521                         if (j == sbi->s_partitions)
1522                                 return 1;
1523
1524                         sbi->s_vat_inode = udf_iget(sb, ino);
1525                         if (!sbi->s_vat_inode)
1526                                 return 1;
1527
1528                         if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1529                                 map->s_type_specific.s_virtual.s_start_offset =
1530                                         udf_ext0_offset(sbi->s_vat_inode);
1531                                 map->s_type_specific.s_virtual.s_num_entries =
1532                                         (sbi->s_vat_inode->i_size - 36) >> 2;
1533                         } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1534                                 uint32_t pos;
1535                                 struct virtualAllocationTable20 *vat20;
1536
1537                                 pos = udf_block_map(sbi->s_vat_inode, 0);
1538                                 bh = sb_bread(sb, pos);
1539                                 if (!bh)
1540                                         return 1;
1541                                 vat20 = (struct virtualAllocationTable20 *)
1542                                         bh->b_data +
1543                                         udf_ext0_offset(sbi->s_vat_inode);
1544                                 map->s_type_specific.s_virtual.s_start_offset =
1545                                         le16_to_cpu(vat20->lengthHeader) +
1546                                         udf_ext0_offset(sbi->s_vat_inode);
1547                                 map->s_type_specific.s_virtual.s_num_entries =
1548                                         (sbi->s_vat_inode->i_size -
1549                                          map->s_type_specific.s_virtual.
1550                                                         s_start_offset) >> 2;
1551                                 brelse(bh);
1552                         }
1553                         map->s_partition_root = udf_get_pblock(sb, 0, i, 0);
1554                         map->s_partition_len =
1555                                 sbi->s_partmaps[ino.partitionReferenceNum].
1556                                                                 s_partition_len;
1557                 }
1558         }
1559         return 0;
1560 }
1561
1562 static void udf_open_lvid(struct super_block *sb)
1563 {
1564         struct udf_sb_info *sbi = UDF_SB(sb);
1565         struct buffer_head *bh = sbi->s_lvid_bh;
1566         if (bh) {
1567                 kernel_timestamp cpu_time;
1568                 struct logicalVolIntegrityDesc *lvid =
1569                                 (struct logicalVolIntegrityDesc *)bh->b_data;
1570                 struct logicalVolIntegrityDescImpUse *lvidiu =
1571                                                         udf_sb_lvidiu(sbi);
1572
1573                 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1574                 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1575                 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
1576                         lvid->recordingDateAndTime = cpu_to_lets(cpu_time);
1577                 lvid->integrityType = LVID_INTEGRITY_TYPE_OPEN;
1578
1579                 lvid->descTag.descCRC = cpu_to_le16(
1580                         udf_crc((char *)lvid + sizeof(tag),
1581                                 le16_to_cpu(lvid->descTag.descCRCLength),
1582                                 0));
1583
1584                 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1585                 mark_buffer_dirty(bh);
1586         }
1587 }
1588
1589 static void udf_close_lvid(struct super_block *sb)
1590 {
1591         kernel_timestamp cpu_time;
1592         struct udf_sb_info *sbi = UDF_SB(sb);
1593         struct buffer_head *bh = sbi->s_lvid_bh;
1594         struct logicalVolIntegrityDesc *lvid;
1595
1596         if (!bh)
1597                 return;
1598
1599         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1600
1601         if (lvid->integrityType == LVID_INTEGRITY_TYPE_OPEN) {
1602                 struct logicalVolIntegrityDescImpUse *lvidiu =
1603                                                         udf_sb_lvidiu(sbi);
1604                 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1605                 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1606                 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
1607                         lvid->recordingDateAndTime = cpu_to_lets(cpu_time);
1608                 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1609                         lvidiu->maxUDFWriteRev =
1610                                         cpu_to_le16(UDF_MAX_WRITE_VERSION);
1611                 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1612                         lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1613                 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
1614                         lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
1615                 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1616
1617                 lvid->descTag.descCRC = cpu_to_le16(
1618                         udf_crc((char *)lvid + sizeof(tag),
1619                                 le16_to_cpu(lvid->descTag.descCRCLength),
1620                                 0));
1621
1622                 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1623                 mark_buffer_dirty(bh);
1624         }
1625 }
1626
1627 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
1628 {
1629         int i;
1630         int nr_groups = bitmap->s_nr_groups;
1631         int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
1632                                                 nr_groups);
1633
1634         for (i = 0; i < nr_groups; i++)
1635                 if (bitmap->s_block_bitmap[i])
1636                         brelse(bitmap->s_block_bitmap[i]);
1637
1638         if (size <= PAGE_SIZE)
1639                 kfree(bitmap);
1640         else
1641                 vfree(bitmap);
1642 }
1643
1644 /*
1645  * udf_read_super
1646  *
1647  * PURPOSE
1648  *      Complete the specified super block.
1649  *
1650  * PRE-CONDITIONS
1651  *      sb                      Pointer to superblock to complete - never NULL.
1652  *      sb->s_dev               Device to read suberblock from.
1653  *      options                 Pointer to mount options.
1654  *      silent                  Silent flag.
1655  *
1656  * HISTORY
1657  *      July 1, 1997 - Andrew E. Mileski
1658  *      Written, tested, and released.
1659  */
1660 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1661 {
1662         int i;
1663         struct inode *inode = NULL;
1664         struct udf_options uopt;
1665         kernel_lb_addr rootdir, fileset;
1666         struct udf_sb_info *sbi;
1667
1668         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1669         uopt.uid = -1;
1670         uopt.gid = -1;
1671         uopt.umask = 0;
1672
1673         sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1674         if (!sbi)
1675                 return -ENOMEM;
1676
1677         sb->s_fs_info = sbi;
1678
1679         mutex_init(&sbi->s_alloc_mutex);
1680
1681         if (!udf_parse_options((char *)options, &uopt))
1682                 goto error_out;
1683
1684         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1685             uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
1686                 udf_error(sb, "udf_read_super",
1687                           "utf8 cannot be combined with iocharset\n");
1688                 goto error_out;
1689         }
1690 #ifdef CONFIG_UDF_NLS
1691         if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1692                 uopt.nls_map = load_nls_default();
1693                 if (!uopt.nls_map)
1694                         uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1695                 else
1696                         udf_debug("Using default NLS map\n");
1697         }
1698 #endif
1699         if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1700                 uopt.flags |= (1 << UDF_FLAG_UTF8);
1701
1702         fileset.logicalBlockNum = 0xFFFFFFFF;
1703         fileset.partitionReferenceNum = 0xFFFF;
1704
1705         sbi->s_flags = uopt.flags;
1706         sbi->s_uid = uopt.uid;
1707         sbi->s_gid = uopt.gid;
1708         sbi->s_umask = uopt.umask;
1709         sbi->s_nls_map = uopt.nls_map;
1710
1711         /* Set the block size for all transfers */
1712         if (!udf_set_blocksize(sb, uopt.blocksize))
1713                 goto error_out;
1714
1715         if (uopt.session == 0xFFFFFFFF)
1716                 sbi->s_session = udf_get_last_session(sb);
1717         else
1718                 sbi->s_session = uopt.session;
1719
1720         udf_debug("Multi-session=%d\n", sbi->s_session);
1721
1722         sbi->s_last_block = uopt.lastblock;
1723         sbi->s_anchor[0] = sbi->s_anchor[1] = 0;
1724         sbi->s_anchor[2] = uopt.anchor;
1725         sbi->s_anchor[3] = 256;
1726
1727         if (udf_check_valid(sb, uopt.novrs, silent)) {
1728                 /* read volume recognition sequences */
1729                 printk(KERN_WARNING "UDF-fs: No VRS found\n");
1730                 goto error_out;
1731         }
1732
1733         udf_find_anchor(sb);
1734
1735         /* Fill in the rest of the superblock */
1736         sb->s_op = &udf_sb_ops;
1737         sb->dq_op = NULL;
1738         sb->s_dirt = 0;
1739         sb->s_magic = UDF_SUPER_MAGIC;
1740         sb->s_time_gran = 1000;
1741
1742         if (udf_load_partition(sb, &fileset)) {
1743                 printk(KERN_WARNING "UDF-fs: No partition found (1)\n");
1744                 goto error_out;
1745         }
1746
1747         udf_debug("Lastblock=%d\n", sbi->s_last_block);
1748
1749         if (sbi->s_lvid_bh) {
1750                 struct logicalVolIntegrityDescImpUse *lvidiu =
1751                                                         udf_sb_lvidiu(sbi);
1752                 uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
1753                 uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
1754                 /* uint16_t maxUDFWriteRev =
1755                                 le16_to_cpu(lvidiu->maxUDFWriteRev); */
1756
1757                 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
1758                         printk(KERN_ERR "UDF-fs: minUDFReadRev=%x "
1759                                         "(max is %x)\n",
1760                                le16_to_cpu(lvidiu->minUDFReadRev),
1761                                UDF_MAX_READ_VERSION);
1762                         goto error_out;
1763                 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
1764                         sb->s_flags |= MS_RDONLY;
1765
1766                 sbi->s_udfrev = minUDFWriteRev;
1767
1768                 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1769                         UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
1770                 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
1771                         UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
1772         }
1773
1774         if (!sbi->s_partitions) {
1775                 printk(KERN_WARNING "UDF-fs: No partition found (2)\n");
1776                 goto error_out;
1777         }
1778
1779         if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
1780                         UDF_PART_FLAG_READ_ONLY) {
1781                 printk(KERN_NOTICE "UDF-fs: Partition marked readonly; "
1782                                    "forcing readonly mount\n");
1783                 sb->s_flags |= MS_RDONLY;
1784         }
1785
1786         if (udf_find_fileset(sb, &fileset, &rootdir)) {
1787                 printk(KERN_WARNING "UDF-fs: No fileset found\n");
1788                 goto error_out;
1789         }
1790
1791         if (!silent) {
1792                 kernel_timestamp ts;
1793                 udf_time_to_stamp(&ts, sbi->s_record_time);
1794                 udf_info("UDF %s (%s) Mounting volume '%s', "
1795                          "timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
1796                          UDFFS_VERSION, UDFFS_DATE,
1797                          sbi->s_volume_ident, ts.year, ts.month, ts.day,
1798                          ts.hour, ts.minute, ts.typeAndTimezone);
1799         }
1800         if (!(sb->s_flags & MS_RDONLY))
1801                 udf_open_lvid(sb);
1802
1803         /* Assign the root inode */
1804         /* assign inodes by physical block number */
1805         /* perhaps it's not extensible enough, but for now ... */
1806         inode = udf_iget(sb, rootdir);
1807         if (!inode) {
1808                 printk(KERN_ERR "UDF-fs: Error in udf_iget, block=%d, "
1809                                 "partition=%d\n",
1810                        rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
1811                 goto error_out;
1812         }
1813
1814         /* Allocate a dentry for the root inode */
1815         sb->s_root = d_alloc_root(inode);
1816         if (!sb->s_root) {
1817                 printk(KERN_ERR "UDF-fs: Couldn't allocate root dentry\n");
1818                 iput(inode);
1819                 goto error_out;
1820         }
1821         sb->s_maxbytes = MAX_LFS_FILESIZE;
1822         return 0;
1823
1824 error_out:
1825         if (sbi->s_vat_inode)
1826                 iput(sbi->s_vat_inode);
1827         if (sbi->s_partitions) {
1828                 struct udf_part_map *map = &sbi->s_partmaps[sbi->s_partition];
1829                 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1830                         iput(map->s_uspace.s_table);
1831                 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1832                         iput(map->s_fspace.s_table);
1833                 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1834                         udf_sb_free_bitmap(map->s_uspace.s_bitmap);
1835                 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1836                         udf_sb_free_bitmap(map->s_fspace.s_bitmap);
1837                 if (map->s_partition_type == UDF_SPARABLE_MAP15)
1838                         for (i = 0; i < 4; i++)
1839                                 brelse(map->s_type_specific.s_sparing.
1840                                                 s_spar_map[i]);
1841         }
1842 #ifdef CONFIG_UDF_NLS
1843         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1844                 unload_nls(sbi->s_nls_map);
1845 #endif
1846         if (!(sb->s_flags & MS_RDONLY))
1847                 udf_close_lvid(sb);
1848         brelse(sbi->s_lvid_bh);
1849
1850         kfree(sbi->s_partmaps);
1851         kfree(sbi);
1852         sb->s_fs_info = NULL;
1853
1854         return -EINVAL;
1855 }
1856
1857 void udf_error(struct super_block *sb, const char *function,
1858                const char *fmt, ...)
1859 {
1860         va_list args;
1861
1862         if (!(sb->s_flags & MS_RDONLY)) {
1863                 /* mark sb error */
1864                 sb->s_dirt = 1;
1865         }
1866         va_start(args, fmt);
1867         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1868         va_end(args);
1869         printk(KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
1870                 sb->s_id, function, error_buf);
1871 }
1872
1873 void udf_warning(struct super_block *sb, const char *function,
1874                  const char *fmt, ...)
1875 {
1876         va_list args;
1877
1878         va_start(args, fmt);
1879         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1880         va_end(args);
1881         printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
1882                sb->s_id, function, error_buf);
1883 }
1884
1885 /*
1886  * udf_put_super
1887  *
1888  * PURPOSE
1889  *      Prepare for destruction of the superblock.
1890  *
1891  * DESCRIPTION
1892  *      Called before the filesystem is unmounted.
1893  *
1894  * HISTORY
1895  *      July 1, 1997 - Andrew E. Mileski
1896  *      Written, tested, and released.
1897  */
1898 static void udf_put_super(struct super_block *sb)
1899 {
1900         int i;
1901         struct udf_sb_info *sbi;
1902
1903         sbi = UDF_SB(sb);
1904         if (sbi->s_vat_inode)
1905                 iput(sbi->s_vat_inode);
1906         if (sbi->s_partitions) {
1907                 struct udf_part_map *map = &sbi->s_partmaps[sbi->s_partition];
1908                 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1909                         iput(map->s_uspace.s_table);
1910                 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1911                         iput(map->s_fspace.s_table);
1912                 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1913                         udf_sb_free_bitmap(map->s_uspace.s_bitmap);
1914                 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1915                         udf_sb_free_bitmap(map->s_fspace.s_bitmap);
1916                 if (map->s_partition_type == UDF_SPARABLE_MAP15)
1917                         for (i = 0; i < 4; i++)
1918                                 brelse(map->s_type_specific.s_sparing.
1919                                                 s_spar_map[i]);
1920         }
1921 #ifdef CONFIG_UDF_NLS
1922         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1923                 unload_nls(sbi->s_nls_map);
1924 #endif
1925         if (!(sb->s_flags & MS_RDONLY))
1926                 udf_close_lvid(sb);
1927         brelse(sbi->s_lvid_bh);
1928         kfree(sbi->s_partmaps);
1929         kfree(sb->s_fs_info);
1930         sb->s_fs_info = NULL;
1931 }
1932
1933 /*
1934  * udf_stat_fs
1935  *
1936  * PURPOSE
1937  *      Return info about the filesystem.
1938  *
1939  * DESCRIPTION
1940  *      Called by sys_statfs()
1941  *
1942  * HISTORY
1943  *      July 1, 1997 - Andrew E. Mileski
1944  *      Written, tested, and released.
1945  */
1946 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
1947 {
1948         struct super_block *sb = dentry->d_sb;
1949         struct udf_sb_info *sbi = UDF_SB(sb);
1950         struct logicalVolIntegrityDescImpUse *lvidiu;
1951
1952         if (sbi->s_lvid_bh != NULL)
1953                 lvidiu = udf_sb_lvidiu(sbi);
1954         else
1955                 lvidiu = NULL;
1956
1957         buf->f_type = UDF_SUPER_MAGIC;
1958         buf->f_bsize = sb->s_blocksize;
1959         buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
1960         buf->f_bfree = udf_count_free(sb);
1961         buf->f_bavail = buf->f_bfree;
1962         buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
1963                                           le32_to_cpu(lvidiu->numDirs)) : 0)
1964                         + buf->f_bfree;
1965         buf->f_ffree = buf->f_bfree;
1966         /* __kernel_fsid_t f_fsid */
1967         buf->f_namelen = UDF_NAME_LEN - 2;
1968
1969         return 0;
1970 }
1971
1972 static unsigned char udf_bitmap_lookup[16] = {
1973         0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4
1974 };
1975
1976 static unsigned int udf_count_free_bitmap(struct super_block *sb,
1977                                           struct udf_bitmap *bitmap)
1978 {
1979         struct buffer_head *bh = NULL;
1980         unsigned int accum = 0;
1981         int index;
1982         int block = 0, newblock;
1983         kernel_lb_addr loc;
1984         uint32_t bytes;
1985         uint8_t value;
1986         uint8_t *ptr;
1987         uint16_t ident;
1988         struct spaceBitmapDesc *bm;
1989
1990         lock_kernel();
1991
1992         loc.logicalBlockNum = bitmap->s_extPosition;
1993         loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
1994         bh = udf_read_ptagged(sb, loc, 0, &ident);
1995
1996         if (!bh) {
1997                 printk(KERN_ERR "udf: udf_count_free failed\n");
1998                 goto out;
1999         } else if (ident != TAG_IDENT_SBD) {
2000                 brelse(bh);
2001                 printk(KERN_ERR "udf: udf_count_free failed\n");
2002                 goto out;
2003         }
2004
2005         bm = (struct spaceBitmapDesc *)bh->b_data;
2006         bytes = le32_to_cpu(bm->numOfBytes);
2007         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2008         ptr = (uint8_t *)bh->b_data;
2009
2010         while (bytes > 0) {
2011                 while ((bytes > 0) && (index < sb->s_blocksize)) {
2012                         value = ptr[index];
2013                         accum += udf_bitmap_lookup[value & 0x0f];
2014                         accum += udf_bitmap_lookup[value >> 4];
2015                         index++;
2016                         bytes--;
2017                 }
2018                 if (bytes) {
2019                         brelse(bh);
2020                         newblock = udf_get_lb_pblock(sb, loc, ++block);
2021                         bh = udf_tread(sb, newblock);
2022                         if (!bh) {
2023                                 udf_debug("read failed\n");
2024                                 goto out;
2025                         }
2026                         index = 0;
2027                         ptr = (uint8_t *)bh->b_data;
2028                 }
2029         }
2030         brelse(bh);
2031
2032 out:
2033         unlock_kernel();
2034
2035         return accum;
2036 }
2037
2038 static unsigned int udf_count_free_table(struct super_block *sb,
2039                                          struct inode *table)
2040 {
2041         unsigned int accum = 0;
2042         uint32_t elen;
2043         kernel_lb_addr eloc;
2044         int8_t etype;
2045         struct extent_position epos;
2046
2047         lock_kernel();
2048
2049         epos.block = UDF_I(table)->i_location;
2050         epos.offset = sizeof(struct unallocSpaceEntry);
2051         epos.bh = NULL;
2052
2053         while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2054                 accum += (elen >> table->i_sb->s_blocksize_bits);
2055
2056         brelse(epos.bh);
2057
2058         unlock_kernel();
2059
2060         return accum;
2061 }
2062
2063 static unsigned int udf_count_free(struct super_block *sb)
2064 {
2065         unsigned int accum = 0;
2066         struct udf_sb_info *sbi;
2067         struct udf_part_map *map;
2068
2069         sbi = UDF_SB(sb);
2070         if (sbi->s_lvid_bh) {
2071                 struct logicalVolIntegrityDesc *lvid =
2072                         (struct logicalVolIntegrityDesc *)
2073                         sbi->s_lvid_bh->b_data;
2074                 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
2075                         accum = le32_to_cpu(
2076                                         lvid->freeSpaceTable[sbi->s_partition]);
2077                         if (accum == 0xFFFFFFFF)
2078                                 accum = 0;
2079                 }
2080         }
2081
2082         if (accum)
2083                 return accum;
2084
2085         map = &sbi->s_partmaps[sbi->s_partition];
2086         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2087                 accum += udf_count_free_bitmap(sb,
2088                                                map->s_uspace.s_bitmap);
2089         }
2090         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
2091                 accum += udf_count_free_bitmap(sb,
2092                                                map->s_fspace.s_bitmap);
2093         }
2094         if (accum)
2095                 return accum;
2096
2097         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2098                 accum += udf_count_free_table(sb,
2099                                               map->s_uspace.s_table);
2100         }
2101         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
2102                 accum += udf_count_free_table(sb,
2103                                               map->s_fspace.s_table);
2104         }
2105
2106         return accum;
2107 }