err.no Git - linux-2.6/blob - fs/udf/super.c

   1 /*
   2  * super.c
   3  *
   4  * PURPOSE
   5  *  Super block routines for the OSTA-UDF(tm) filesystem.
   6  *
   7  * DESCRIPTION
   8  *  OSTA-UDF(tm) = Optical Storage Technology Association
   9  *  Universal Disk Format.
  10  *
  11  *  This code is based on version 2.00 of the UDF specification,
  12  *  and revision 3 of the ECMA 167 standard [equivalent to ISO 13346].
  13  *    http://www.osta.org/
  14  *    http://www.ecma.ch/
  15  *    http://www.iso.org/
  16  *
  17  * COPYRIGHT
  18  *  This file is distributed under the terms of the GNU General Public
  19  *  License (GPL). Copies of the GPL can be obtained from:
  20  *    ftp://prep.ai.mit.edu/pub/gnu/GPL
  21  *  Each contributing author retains all rights to their own work.
  22  *
  23  *  (C) 1998 Dave Boynton
  24  *  (C) 1998-2004 Ben Fennema
  25  *  (C) 2000 Stelias Computing Inc
  26  *
  27  * HISTORY
  28  *
  29  *  09/24/98 dgb  changed to allow compiling outside of kernel, and
  30  *                added some debugging.
  31  *  10/01/98 dgb  updated to allow (some) possibility of compiling w/2.0.34
  32  *  10/16/98      attempting some multi-session support
  33  *  10/17/98      added freespace count for "df"
  34  *  11/11/98 gr   added novrs option
  35  *  11/26/98 dgb  added fileset,anchor mount options
  36  *  12/06/98 blf  really hosed things royally. vat/sparing support. sequenced
  37  *                vol descs. rewrote option handling based on isofs
  38  *  12/20/98      find the free space bitmap (if it exists)
  39  */
  40
  41 #include "udfdecl.h"
  42
  43 #include <linux/blkdev.h>
  44 #include <linux/slab.h>
  45 #include <linux/kernel.h>
  46 #include <linux/module.h>
  47 #include <linux/parser.h>
  48 #include <linux/stat.h>
  49 #include <linux/cdrom.h>
  50 #include <linux/nls.h>
  51 #include <linux/smp_lock.h>
  52 #include <linux/buffer_head.h>
  53 #include <linux/vfs.h>
  54 #include <linux/vmalloc.h>
  55 #include <asm/byteorder.h>
  56
  57 #include <linux/udf_fs.h>
  58 #include "udf_sb.h"
  59 #include "udf_i.h"
  60
  61 #include <linux/init.h>
  62 #include <asm/uaccess.h>
  63
  64 #define VDS_POS_PRIMARY_VOL_DESC        0
  65 #define VDS_POS_UNALLOC_SPACE_DESC      1
  66 #define VDS_POS_LOGICAL_VOL_DESC        2
  67 #define VDS_POS_PARTITION_DESC          3
  68 #define VDS_POS_IMP_USE_VOL_DESC        4
  69 #define VDS_POS_VOL_DESC_PTR            5
  70 #define VDS_POS_TERMINATING_DESC        6
  71 #define VDS_POS_LENGTH                  7
  72
  73 static char error_buf[1024];
  74
  75 /* These are the "meat" - everything else is stuffing */
  76 static int udf_fill_super(struct super_block *, void *, int);
  77 static void udf_put_super(struct super_block *);
  78 static void udf_write_super(struct super_block *);
  79 static int udf_remount_fs(struct super_block *, int *, char *);
  80 static int udf_check_valid(struct super_block *, int, int);
  81 static int udf_vrs(struct super_block *sb, int silent);
  82 static int udf_load_partition(struct super_block *, kernel_lb_addr *);
  83 static int udf_load_logicalvol(struct super_block *, struct buffer_head *,
  84                                kernel_lb_addr *);
  85 static void udf_load_logicalvolint(struct super_block *, kernel_extent_ad);
  86 static void udf_find_anchor(struct super_block *);
  87 static int udf_find_fileset(struct super_block *, kernel_lb_addr *,
  88                             kernel_lb_addr *);
  89 static void udf_load_pvoldesc(struct super_block *, struct buffer_head *);
  90 static void udf_load_fileset(struct super_block *, struct buffer_head *,
  91                              kernel_lb_addr *);
  92 static int udf_load_partdesc(struct super_block *, struct buffer_head *);
  93 static void udf_open_lvid(struct super_block *);
  94 static void udf_close_lvid(struct super_block *);
  95 static unsigned int udf_count_free(struct super_block *);
  96 static int udf_statfs(struct dentry *, struct kstatfs *);
  97
  98 /* UDF filesystem type */
  99 static int udf_get_sb(struct file_system_type *fs_type,
 100                       int flags, const char *dev_name, void *data,
 101                       struct vfsmount *mnt)
 102 {
 103         return get_sb_bdev(fs_type, flags, dev_name, data, udf_fill_super, mnt);
 104 }
 105
 106 static struct file_system_type udf_fstype = {
 107         .owner          = THIS_MODULE,
 108         .name           = "udf",
 109         .get_sb         = udf_get_sb,
 110         .kill_sb        = kill_block_super,
 111         .fs_flags       = FS_REQUIRES_DEV,
 112 };
 113
 114 static struct kmem_cache *udf_inode_cachep;
 115
 116 static struct inode *udf_alloc_inode(struct super_block *sb)
 117 {
 118         struct udf_inode_info *ei;
 119         ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
 120         if (!ei)
 121                 return NULL;
 122
 123         ei->i_unique = 0;
 124         ei->i_lenExtents = 0;
 125         ei->i_next_alloc_block = 0;
 126         ei->i_next_alloc_goal = 0;
 127         ei->i_strat4096 = 0;
 128
 129         return &ei->vfs_inode;
 130 }
 131
 132 static void udf_destroy_inode(struct inode *inode)
 133 {
 134         kmem_cache_free(udf_inode_cachep, UDF_I(inode));
 135 }
 136
 137 static void init_once(struct kmem_cache *cachep, void *foo)
 138 {
 139         struct udf_inode_info *ei = (struct udf_inode_info *)foo;
 140
 141         ei->i_ext.i_data = NULL;
 142         inode_init_once(&ei->vfs_inode);
 143 }
 144
 145 static int init_inodecache(void)
 146 {
 147         udf_inode_cachep = kmem_cache_create("udf_inode_cache",
 148                                              sizeof(struct udf_inode_info),
 149                                              0, (SLAB_RECLAIM_ACCOUNT |
 150                                                  SLAB_MEM_SPREAD),
 151                                              init_once);
 152         if (!udf_inode_cachep)
 153                 return -ENOMEM;
 154         return 0;
 155 }
 156
 157 static void destroy_inodecache(void)
 158 {
 159         kmem_cache_destroy(udf_inode_cachep);
 160 }
 161
 162 /* Superblock operations */
 163 static const struct super_operations udf_sb_ops = {
 164         .alloc_inode    = udf_alloc_inode,
 165         .destroy_inode  = udf_destroy_inode,
 166         .write_inode    = udf_write_inode,
 167         .delete_inode   = udf_delete_inode,
 168         .clear_inode    = udf_clear_inode,
 169         .put_super      = udf_put_super,
 170         .write_super    = udf_write_super,
 171         .statfs         = udf_statfs,
 172         .remount_fs     = udf_remount_fs,
 173 };
 174
 175 struct udf_options {
 176         unsigned char novrs;
 177         unsigned int blocksize;
 178         unsigned int session;
 179         unsigned int lastblock;
 180         unsigned int anchor;
 181         unsigned int volume;
 182         unsigned short partition;
 183         unsigned int fileset;
 184         unsigned int rootdir;
 185         unsigned int flags;
 186         mode_t umask;
 187         gid_t gid;
 188         uid_t uid;
 189         struct nls_table *nls_map;
 190 };
 191
 192 static int __init init_udf_fs(void)
 193 {
 194         int err;
 195
 196         err = init_inodecache();
 197         if (err)
 198                 goto out1;
 199         err = register_filesystem(&udf_fstype);
 200         if (err)
 201                 goto out;
 202
 203         return 0;
 204
 205 out:
 206         destroy_inodecache();
 207
 208 out1:
 209         return err;
 210 }
 211
 212 static void __exit exit_udf_fs(void)
 213 {
 214         unregister_filesystem(&udf_fstype);
 215         destroy_inodecache();
 216 }
 217
 218 module_init(init_udf_fs)
 219 module_exit(exit_udf_fs)
 220
 221 /*
 222  * udf_parse_options
 223  *
 224  * PURPOSE
 225  *      Parse mount options.
 226  *
 227  * DESCRIPTION
 228  *      The following mount options are supported:
 229  *
 230  *      gid=            Set the default group.
 231  *      umask=          Set the default umask.
 232  *      uid=            Set the default user.
 233  *      bs=             Set the block size.
 234  *      unhide          Show otherwise hidden files.
 235  *      undelete        Show deleted files in lists.
 236  *      adinicb         Embed data in the inode (default)
 237  *      noadinicb       Don't embed data in the inode
 238  *      shortad         Use short ad's
 239  *      longad          Use long ad's (default)
 240  *      nostrict        Unset strict conformance
 241  *      iocharset=      Set the NLS character set
 242  *
 243  *      The remaining are for debugging and disaster recovery:
 244  *
 245  *      novrs           Skip volume sequence recognition
 246  *
 247  *      The following expect a offset from 0.
 248  *
 249  *      session=        Set the CDROM session (default= last session)
 250  *      anchor=         Override standard anchor location. (default= 256)
 251  *      volume=         Override the VolumeDesc location. (unused)
 252  *      partition=      Override the PartitionDesc location. (unused)
 253  *      lastblock=      Set the last block of the filesystem/
 254  *
 255  *      The following expect a offset from the partition root.
 256  *
 257  *      fileset=        Override the fileset block location. (unused)
 258  *      rootdir=        Override the root directory location. (unused)
 259  *              WARNING: overriding the rootdir to a non-directory may
 260  *              yield highly unpredictable results.
 261  *
 262  * PRE-CONDITIONS
 263  *      options         Pointer to mount options string.
 264  *      uopts           Pointer to mount options variable.
 265  *
 266  * POST-CONDITIONS
 267  *      <return>        1       Mount options parsed okay.
 268  *      <return>        0       Error parsing mount options.
 269  *
 270  * HISTORY
 271  *      July 1, 1997 - Andrew E. Mileski
 272  *      Written, tested, and released.
 273  */
 274
 275 enum {
 276         Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
 277         Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
 278         Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
 279         Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
 280         Opt_rootdir, Opt_utf8, Opt_iocharset,
 281         Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore
 282 };
 283
 284 static match_table_t tokens = {
 285         {Opt_novrs,     "novrs"},
 286         {Opt_nostrict,  "nostrict"},
 287         {Opt_bs,        "bs=%u"},
 288         {Opt_unhide,    "unhide"},
 289         {Opt_undelete,  "undelete"},
 290         {Opt_noadinicb, "noadinicb"},
 291         {Opt_adinicb,   "adinicb"},
 292         {Opt_shortad,   "shortad"},
 293         {Opt_longad,    "longad"},
 294         {Opt_uforget,   "uid=forget"},
 295         {Opt_uignore,   "uid=ignore"},
 296         {Opt_gforget,   "gid=forget"},
 297         {Opt_gignore,   "gid=ignore"},
 298         {Opt_gid,       "gid=%u"},
 299         {Opt_uid,       "uid=%u"},
 300         {Opt_umask,     "umask=%o"},
 301         {Opt_session,   "session=%u"},
 302         {Opt_lastblock, "lastblock=%u"},
 303         {Opt_anchor,    "anchor=%u"},
 304         {Opt_volume,    "volume=%u"},
 305         {Opt_partition, "partition=%u"},
 306         {Opt_fileset,   "fileset=%u"},
 307         {Opt_rootdir,   "rootdir=%u"},
 308         {Opt_utf8,      "utf8"},
 309         {Opt_iocharset, "iocharset=%s"},
 310         {Opt_err,       NULL}
 311 };
 312
 313 static int udf_parse_options(char *options, struct udf_options *uopt)
 314 {
 315         char *p;
 316         int option;
 317
 318         uopt->novrs = 0;
 319         uopt->blocksize = 2048;
 320         uopt->partition = 0xFFFF;
 321         uopt->session = 0xFFFFFFFF;
 322         uopt->lastblock = 0;
 323         uopt->anchor = 0;
 324         uopt->volume = 0xFFFFFFFF;
 325         uopt->rootdir = 0xFFFFFFFF;
 326         uopt->fileset = 0xFFFFFFFF;
 327         uopt->nls_map = NULL;
 328
 329         if (!options)
 330                 return 1;
 331
 332         while ((p = strsep(&options, ",")) != NULL) {
 333                 substring_t args[MAX_OPT_ARGS];
 334                 int token;
 335                 if (!*p)
 336                         continue;
 337
 338                 token = match_token(p, tokens, args);
 339                 switch (token) {
 340                 case Opt_novrs:
 341                         uopt->novrs = 1;
 342                 case Opt_bs:
 343                         if (match_int(&args[0], &option))
 344                                 return 0;
 345                         uopt->blocksize = option;
 346                         break;
 347                 case Opt_unhide:
 348                         uopt->flags |= (1 << UDF_FLAG_UNHIDE);
 349                         break;
 350                 case Opt_undelete:
 351                         uopt->flags |= (1 << UDF_FLAG_UNDELETE);
 352                         break;
 353                 case Opt_noadinicb:
 354                         uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
 355                         break;
 356                 case Opt_adinicb:
 357                         uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
 358                         break;
 359                 case Opt_shortad:
 360                         uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
 361                         break;
 362                 case Opt_longad:
 363                         uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
 364                         break;
 365                 case Opt_gid:
 366                         if (match_int(args, &option))
 367                                 return 0;
 368                         uopt->gid = option;
 369                         uopt->flags |= (1 << UDF_FLAG_GID_SET);
 370                         break;
 371                 case Opt_uid:
 372                         if (match_int(args, &option))
 373                                 return 0;
 374                         uopt->uid = option;
 375                         uopt->flags |= (1 << UDF_FLAG_UID_SET);
 376                         break;
 377                 case Opt_umask:
 378                         if (match_octal(args, &option))
 379                                 return 0;
 380                         uopt->umask = option;
 381                         break;
 382                 case Opt_nostrict:
 383                         uopt->flags &= ~(1 << UDF_FLAG_STRICT);
 384                         break;
 385                 case Opt_session:
 386                         if (match_int(args, &option))
 387                                 return 0;
 388                         uopt->session = option;
 389                         break;
 390                 case Opt_lastblock:
 391                         if (match_int(args, &option))
 392                                 return 0;
 393                         uopt->lastblock = option;
 394                         break;
 395                 case Opt_anchor:
 396                         if (match_int(args, &option))
 397                                 return 0;
 398                         uopt->anchor = option;
 399                         break;
 400                 case Opt_volume:
 401                         if (match_int(args, &option))
 402                                 return 0;
 403                         uopt->volume = option;
 404                         break;
 405                 case Opt_partition:
 406                         if (match_int(args, &option))
 407                                 return 0;
 408                         uopt->partition = option;
 409                         break;
 410                 case Opt_fileset:
 411                         if (match_int(args, &option))
 412                                 return 0;
 413                         uopt->fileset = option;
 414                         break;
 415                 case Opt_rootdir:
 416                         if (match_int(args, &option))
 417                                 return 0;
 418                         uopt->rootdir = option;
 419                         break;
 420                 case Opt_utf8:
 421                         uopt->flags |= (1 << UDF_FLAG_UTF8);
 422                         break;
 423 #ifdef CONFIG_UDF_NLS
 424                 case Opt_iocharset:
 425                         uopt->nls_map = load_nls(args[0].from);
 426                         uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
 427                         break;
 428 #endif
 429                 case Opt_uignore:
 430                         uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
 431                         break;
 432                 case Opt_uforget:
 433                         uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
 434                         break;
 435                 case Opt_gignore:
 436                         uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
 437                         break;
 438                 case Opt_gforget:
 439                         uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
 440                         break;
 441                 default:
 442                         printk(KERN_ERR "udf: bad mount option \"%s\" "
 443                                "or missing value\n", p);
 444                         return 0;
 445                 }
 446         }
 447         return 1;
 448 }
 449
 450 void udf_write_super(struct super_block *sb)
 451 {
 452         lock_kernel();
 453
 454         if (!(sb->s_flags & MS_RDONLY))
 455                 udf_open_lvid(sb);
 456         sb->s_dirt = 0;
 457
 458         unlock_kernel();
 459 }
 460
 461 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
 462 {
 463         struct udf_options uopt;
 464
 465         uopt.flags = UDF_SB(sb)->s_flags;
 466         uopt.uid   = UDF_SB(sb)->s_uid;
 467         uopt.gid   = UDF_SB(sb)->s_gid;
 468         uopt.umask = UDF_SB(sb)->s_umask;
 469
 470         if (!udf_parse_options(options, &uopt))
 471                 return -EINVAL;
 472
 473         UDF_SB(sb)->s_flags = uopt.flags;
 474         UDF_SB(sb)->s_uid   = uopt.uid;
 475         UDF_SB(sb)->s_gid   = uopt.gid;
 476         UDF_SB(sb)->s_umask = uopt.umask;
 477
 478         if (UDF_SB_LVIDBH(sb)) {
 479                 int write_rev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev);
 480                 if (write_rev > UDF_MAX_WRITE_VERSION)
 481                         *flags |= MS_RDONLY;
 482         }
 483
 484         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 485                 return 0;
 486         if (*flags & MS_RDONLY)
 487                 udf_close_lvid(sb);
 488         else
 489                 udf_open_lvid(sb);
 490
 491         return 0;
 492 }
 493
 494 /*
 495  * udf_set_blocksize
 496  *
 497  * PURPOSE
 498  *      Set the block size to be used in all transfers.
 499  *
 500  * DESCRIPTION
 501  *      To allow room for a DMA transfer, it is best to guess big when unsure.
 502  *      This routine picks 2048 bytes as the blocksize when guessing. This
 503  *      should be adequate until devices with larger block sizes become common.
 504  *
 505  *      Note that the Linux kernel can currently only deal with blocksizes of
 506  *      512, 1024, 2048, 4096, and 8192 bytes.
 507  *
 508  * PRE-CONDITIONS
 509  *      sb                      Pointer to _locked_ superblock.
 510  *
 511  * POST-CONDITIONS
 512  *      sb->s_blocksize         Blocksize.
 513  *      sb->s_blocksize_bits    log2 of blocksize.
 514  *      <return>        0       Blocksize is valid.
 515  *      <return>        1       Blocksize is invalid.
 516  *
 517  * HISTORY
 518  *      July 1, 1997 - Andrew E. Mileski
 519  *      Written, tested, and released.
 520  */
 521 static int udf_set_blocksize(struct super_block *sb, int bsize)
 522 {
 523         if (!sb_min_blocksize(sb, bsize)) {
 524                 udf_debug("Bad block size (%d)\n", bsize);
 525                 printk(KERN_ERR "udf: bad block size (%d)\n", bsize);
 526                 return 0;
 527         }
 528
 529         return sb->s_blocksize;
 530 }
 531
 532 static int udf_vrs(struct super_block *sb, int silent)
 533 {
 534         struct volStructDesc *vsd = NULL;
 535         int sector = 32768;
 536         int sectorsize;
 537         struct buffer_head *bh = NULL;
 538         int iso9660 = 0;
 539         int nsr02 = 0;
 540         int nsr03 = 0;
 541
 542         /* Block size must be a multiple of 512 */
 543         if (sb->s_blocksize & 511)
 544                 return 0;
 545
 546         if (sb->s_blocksize < sizeof(struct volStructDesc))
 547                 sectorsize = sizeof(struct volStructDesc);
 548         else
 549                 sectorsize = sb->s_blocksize;
 550
 551         sector += (UDF_SB_SESSION(sb) << sb->s_blocksize_bits);
 552
 553         udf_debug("Starting at sector %u (%ld byte sectors)\n",
 554                   (sector >> sb->s_blocksize_bits), sb->s_blocksize);
 555         /* Process the sequence (if applicable) */
 556         for (; !nsr02 && !nsr03; sector += sectorsize) {
 557                 /* Read a block */
 558                 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
 559                 if (!bh)
 560                         break;
 561
 562                 /* Look for ISO  descriptors */
 563                 vsd = (struct volStructDesc *)(bh->b_data +
 564                                               (sector & (sb->s_blocksize - 1)));
 565
 566                 if (vsd->stdIdent[0] == 0) {
 567                         brelse(bh);
 568                         break;
 569                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
 570                                     VSD_STD_ID_LEN)) {
 571                         iso9660 = sector;
 572                         switch (vsd->structType) {
 573                         case 0:
 574                                 udf_debug("ISO9660 Boot Record found\n");
 575                                 break;
 576                         case 1:
 577                                 udf_debug("ISO9660 Primary Volume Descriptor "
 578                                           "found\n");
 579                                 break;
 580                         case 2:
 581                                 udf_debug("ISO9660 Supplementary Volume "
 582                                           "Descriptor found\n");
 583                                 break;
 584                         case 3:
 585                                 udf_debug("ISO9660 Volume Partition Descriptor "
 586                                           "found\n");
 587                                 break;
 588                         case 255:
 589                                 udf_debug("ISO9660 Volume Descriptor Set "
 590                                           "Terminator found\n");
 591                                 break;
 592                         default:
 593                                 udf_debug("ISO9660 VRS (%u) found\n",
 594                                           vsd->structType);
 595                                 break;
 596                         }
 597                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
 598                                     VSD_STD_ID_LEN))
 599                         ; /* nothing */
 600                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
 601                                     VSD_STD_ID_LEN)) {
 602                         brelse(bh);
 603                         break;
 604                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
 605                                     VSD_STD_ID_LEN))
 606                         nsr02 = sector;
 607                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
 608                                     VSD_STD_ID_LEN))
 609                         nsr03 = sector;
 610                 brelse(bh);
 611         }
 612
 613         if (nsr03)
 614                 return nsr03;
 615         else if (nsr02)
 616                 return nsr02;
 617         else if (sector - (UDF_SB_SESSION(sb) << sb->s_blocksize_bits) == 32768)
 618                 return -1;
 619         else
 620                 return 0;
 621 }
 622
 623 /*
 624  * udf_find_anchor
 625  *
 626  * PURPOSE
 627  *      Find an anchor volume descriptor.
 628  *
 629  * PRE-CONDITIONS
 630  *      sb                      Pointer to _locked_ superblock.
 631  *      lastblock               Last block on media.
 632  *
 633  * POST-CONDITIONS
 634  *      <return>                1 if not found, 0 if ok
 635  *
 636  * HISTORY
 637  *      July 1, 1997 - Andrew E. Mileski
 638  *      Written, tested, and released.
 639  */
 640 static void udf_find_anchor(struct super_block *sb)
 641 {
 642         int lastblock = UDF_SB_LASTBLOCK(sb);
 643         struct buffer_head *bh = NULL;
 644         uint16_t ident;
 645         uint32_t location;
 646         int i;
 647
 648         if (lastblock) {
 649                 int varlastblock = udf_variable_to_fixed(lastblock);
 650                 int last[] =  { lastblock, lastblock - 2,
 651                                 lastblock - 150, lastblock - 152,
 652                                 varlastblock, varlastblock - 2,
 653                                 varlastblock - 150, varlastblock - 152 };
 654
 655                 lastblock = 0;
 656
 657                 /* Search for an anchor volume descriptor pointer */
 658
 659                 /*  according to spec, anchor is in either:
 660                  *     block 256
 661                  *     lastblock-256
 662                  *     lastblock
 663                  *  however, if the disc isn't closed, it could be 512 */
 664
 665                 for (i = 0; !lastblock && i < ARRAY_SIZE(last); i++) {
 666                         ident = location = 0;
 667                         if (last[i] >= 0) {
 668                                 bh = sb_bread(sb, last[i]);
 669                                 if (bh) {
 670                                         tag *t = (tag *)bh->b_data;
 671                                         ident = le16_to_cpu(t->tagIdent);
 672                                         location = le32_to_cpu(t->tagLocation);
 673                                         brelse(bh);
 674                                 }
 675                         }
 676
 677                         if (ident == TAG_IDENT_AVDP) {
 678                                 if (location == last[i] - UDF_SB_SESSION(sb)) {
 679                                         lastblock = last[i] - UDF_SB_SESSION(sb);
 680                                         UDF_SB_ANCHOR(sb)[0] = lastblock;
 681                                         UDF_SB_ANCHOR(sb)[1] = lastblock - 256;
 682                                 } else if (location == udf_variable_to_fixed(last[i]) - UDF_SB_SESSION(sb)) {
 683                                         UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
 684                                         lastblock = udf_variable_to_fixed(last[i]) - UDF_SB_SESSION(sb);
 685                                         UDF_SB_ANCHOR(sb)[0] = lastblock;
 686                                         UDF_SB_ANCHOR(sb)[1] = lastblock - 256 - UDF_SB_SESSION(sb);
 687                                 } else {
 688                                         udf_debug("Anchor found at block %d, location mismatch %d.\n",
 689                                                   last[i], location);
 690                                 }
 691                         } else if (ident == TAG_IDENT_FE || ident == TAG_IDENT_EFE) {
 692                                 lastblock = last[i];
 693                                 UDF_SB_ANCHOR(sb)[3] = 512;
 694                         } else {
 695                                 ident = location = 0;
 696                                 if (last[i] >= 256) {
 697                                         bh = sb_bread(sb, last[i] - 256);
 698                                         if (bh) {
 699                                                 tag *t = (tag *)bh->b_data;
 700                                                 ident = le16_to_cpu(t->tagIdent);
 701                                                 location = le32_to_cpu(t->tagLocation);
 702                                                 brelse(bh);
 703                                         }
 704                                 }
 705
 706                                 if (ident == TAG_IDENT_AVDP &&
 707                                     location == last[i] - 256 - UDF_SB_SESSION(sb)) {
 708                                         lastblock = last[i];
 709                                         UDF_SB_ANCHOR(sb)[1] = last[i] - 256;
 710                                 } else {
 711                                         ident = location = 0;
 712                                         if (last[i] >= 312 + UDF_SB_SESSION(sb)) {
 713                                                 bh = sb_bread(sb, last[i] - 312 - UDF_SB_SESSION(sb));
 714                                                 if (bh) {
 715                                                         tag *t = (tag *)bh->b_data;
 716                                                         ident = le16_to_cpu(t->tagIdent);
 717                                                         location = le32_to_cpu(t->tagLocation);
 718                                                         brelse(bh);
 719                                                 }
 720                                         }
 721
 722                                         if (ident == TAG_IDENT_AVDP &&
 723                                             location == udf_variable_to_fixed(last[i]) - 256) {
 724                                                 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
 725                                                 lastblock = udf_variable_to_fixed(last[i]);
 726                                                 UDF_SB_ANCHOR(sb)[1] = lastblock - 256;
 727                                         }
 728                                 }
 729                         }
 730                 }
 731         }
 732
 733         if (!lastblock) {
 734                 /* We haven't found the lastblock. check 312 */
 735                 bh = sb_bread(sb, 312 + UDF_SB_SESSION(sb));
 736                 if (bh) {
 737                         tag *t = (tag *)bh->b_data;
 738                         ident = le16_to_cpu(t->tagIdent);
 739                         location = le32_to_cpu(t->tagLocation);
 740                         brelse(bh);
 741
 742                         if (ident == TAG_IDENT_AVDP && location == 256)
 743                                 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
 744                 }
 745         }
 746
 747         for (i = 0; i < ARRAY_SIZE(UDF_SB_ANCHOR(sb)); i++) {
 748                 if (UDF_SB_ANCHOR(sb)[i]) {
 749                         bh = udf_read_tagged(sb, UDF_SB_ANCHOR(sb)[i],
 750                                              UDF_SB_ANCHOR(sb)[i], &ident);
 751                         if (!bh)
 752                                 UDF_SB_ANCHOR(sb)[i] = 0;
 753                         else {
 754                                 brelse(bh);
 755                                 if ((ident != TAG_IDENT_AVDP) &&
 756                                     (i || (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE)))
 757                                         UDF_SB_ANCHOR(sb)[i] = 0;
 758                         }
 759                 }
 760         }
 761
 762         UDF_SB_LASTBLOCK(sb) = lastblock;
 763 }
 764
 765 static int udf_find_fileset(struct super_block *sb,
 766                             kernel_lb_addr *fileset,
 767                             kernel_lb_addr *root)
 768 {
 769         struct buffer_head *bh = NULL;
 770         long lastblock;
 771         uint16_t ident;
 772
 773         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
 774             fileset->partitionReferenceNum != 0xFFFF) {
 775                 bh = udf_read_ptagged(sb, *fileset, 0, &ident);
 776
 777                 if (!bh) {
 778                         return 1;
 779                 } else if (ident != TAG_IDENT_FSD) {
 780                         brelse(bh);
 781                         return 1;
 782                 }
 783
 784         }
 785
 786         if (!bh) {
 787                 /* Search backwards through the partitions */
 788                 kernel_lb_addr newfileset;
 789
 790 /* --> cvg: FIXME - is it reasonable? */
 791                 return 1;
 792
 793                 for (newfileset.partitionReferenceNum = UDF_SB_NUMPARTS(sb) - 1;
 794                      (newfileset.partitionReferenceNum != 0xFFFF &&
 795                       fileset->logicalBlockNum == 0xFFFFFFFF &&
 796                       fileset->partitionReferenceNum == 0xFFFF);
 797                      newfileset.partitionReferenceNum--) {
 798                         lastblock = UDF_SB_PARTLEN(sb,
 799                                         newfileset.partitionReferenceNum);
 800                         newfileset.logicalBlockNum = 0;
 801
 802                         do {
 803                                 bh = udf_read_ptagged(sb, newfileset, 0,
 804                                                       &ident);
 805                                 if (!bh) {
 806                                         newfileset.logicalBlockNum++;
 807                                         continue;
 808                                 }
 809
 810                                 switch (ident) {
 811                                 case TAG_IDENT_SBD:
 812                                 {
 813                                         struct spaceBitmapDesc *sp;
 814                                         sp = (struct spaceBitmapDesc *)bh->b_data;
 815                                         newfileset.logicalBlockNum += 1 +
 816                                                 ((le32_to_cpu(sp->numOfBytes) +
 817                                                   sizeof(struct spaceBitmapDesc) - 1)
 818                                                  >> sb->s_blocksize_bits);
 819                                         brelse(bh);
 820                                         break;
 821                                 }
 822                                 case TAG_IDENT_FSD:
 823                                         *fileset = newfileset;
 824                                         break;
 825                                 default:
 826                                         newfileset.logicalBlockNum++;
 827                                         brelse(bh);
 828                                         bh = NULL;
 829                                         break;
 830                                 }
 831                         } while (newfileset.logicalBlockNum < lastblock &&
 832                                  fileset->logicalBlockNum == 0xFFFFFFFF &&
 833                                  fileset->partitionReferenceNum == 0xFFFF);
 834                 }
 835         }
 836
 837         if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
 838              fileset->partitionReferenceNum != 0xFFFF) && bh) {
 839                 udf_debug("Fileset at block=%d, partition=%d\n",
 840                           fileset->logicalBlockNum,
 841                           fileset->partitionReferenceNum);
 842
 843                 UDF_SB_PARTITION(sb) = fileset->partitionReferenceNum;
 844                 udf_load_fileset(sb, bh, root);
 845                 brelse(bh);
 846                 return 0;
 847         }
 848         return 1;
 849 }
 850
 851 static void udf_load_pvoldesc(struct super_block *sb, struct buffer_head *bh)
 852 {
 853         struct primaryVolDesc *pvoldesc;
 854         time_t recording;
 855         long recording_usec;
 856         struct ustr instr;
 857         struct ustr outstr;
 858
 859         pvoldesc = (struct primaryVolDesc *)bh->b_data;
 860
 861         if (udf_stamp_to_time(&recording, &recording_usec,
 862                               lets_to_cpu(pvoldesc->recordingDateAndTime))) {
 863                 kernel_timestamp ts;
 864                 ts = lets_to_cpu(pvoldesc->recordingDateAndTime);
 865                 udf_debug("recording time %ld/%ld, %04u/%02u/%02u"
 866                           " %02u:%02u (%x)\n",
 867                           recording, recording_usec,
 868                           ts.year, ts.month, ts.day, ts.hour,
 869                           ts.minute, ts.typeAndTimezone);
 870                 UDF_SB_RECORDTIME(sb).tv_sec = recording;
 871                 UDF_SB_RECORDTIME(sb).tv_nsec = recording_usec * 1000;
 872         }
 873
 874         if (!udf_build_ustr(&instr, pvoldesc->volIdent, 32)) {
 875                 if (udf_CS0toUTF8(&outstr, &instr)) {
 876                         strncpy(UDF_SB_VOLIDENT(sb), outstr.u_name,
 877                                 outstr.u_len > 31 ? 31 : outstr.u_len);
 878                         udf_debug("volIdent[] = '%s'\n", UDF_SB_VOLIDENT(sb));
 879                 }
 880         }
 881
 882         if (!udf_build_ustr(&instr, pvoldesc->volSetIdent, 128)) {
 883                 if (udf_CS0toUTF8(&outstr, &instr))
 884                         udf_debug("volSetIdent[] = '%s'\n", outstr.u_name);
 885         }
 886 }
 887
 888 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
 889                              kernel_lb_addr *root)
 890 {
 891         struct fileSetDesc *fset;
 892
 893         fset = (struct fileSetDesc *)bh->b_data;
 894
 895         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
 896
 897         UDF_SB_SERIALNUM(sb) = le16_to_cpu(fset->descTag.tagSerialNum);
 898
 899         udf_debug("Rootdir at block=%d, partition=%d\n",
 900                   root->logicalBlockNum, root->partitionReferenceNum);
 901 }
 902
 903 static int udf_load_partdesc(struct super_block *sb, struct buffer_head *bh)
 904 {
 905         struct partitionDesc *p;
 906         int i;
 907
 908         p = (struct partitionDesc *)bh->b_data;
 909
 910         for (i = 0; i < UDF_SB_NUMPARTS(sb); i++) {
 911                 udf_debug("Searching map: (%d == %d)\n",
 912                           UDF_SB_PARTMAPS(sb)[i].s_partition_num, le16_to_cpu(p->partitionNumber));
 913                 if (UDF_SB_PARTMAPS(sb)[i].s_partition_num == le16_to_cpu(p->partitionNumber)) {
 914                         UDF_SB_PARTLEN(sb, i) = le32_to_cpu(p->partitionLength); /* blocks */
 915                         UDF_SB_PARTROOT(sb, i) = le32_to_cpu(p->partitionStartingLocation);
 916                         if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_READ_ONLY)
 917                                 UDF_SB_PARTFLAGS(sb, i) |= UDF_PART_FLAG_READ_ONLY;
 918                         if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_WRITE_ONCE)
 919                                 UDF_SB_PARTFLAGS(sb, i) |= UDF_PART_FLAG_WRITE_ONCE;
 920                         if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_REWRITABLE)
 921                                 UDF_SB_PARTFLAGS(sb, i) |= UDF_PART_FLAG_REWRITABLE;
 922                         if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_OVERWRITABLE)
 923                                 UDF_SB_PARTFLAGS(sb, i) |= UDF_PART_FLAG_OVERWRITABLE;
 924
 925                         if (!strcmp(p->partitionContents.ident,
 926                                     PD_PARTITION_CONTENTS_NSR02) ||
 927                             !strcmp(p->partitionContents.ident,
 928                                     PD_PARTITION_CONTENTS_NSR03)) {
 929                                 struct partitionHeaderDesc *phd;
 930
 931                                 phd = (struct partitionHeaderDesc *)(p->partitionContentsUse);
 932                                 if (phd->unallocSpaceTable.extLength) {
 933                                         kernel_lb_addr loc = {
 934                                                 .logicalBlockNum = le32_to_cpu(phd->unallocSpaceTable.extPosition),
 935                                                 .partitionReferenceNum = i,
 936                                         };
 937
 938                                         UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table =
 939                                                 udf_iget(sb, loc);
 940                                         if (!UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table) {
 941                                                 udf_debug("cannot load unallocSpaceTable (part %d)\n", i);
 942                                                 return 1;
 943                                         }
 944                                         UDF_SB_PARTFLAGS(sb, i) |= UDF_PART_FLAG_UNALLOC_TABLE;
 945                                         udf_debug("unallocSpaceTable (part %d) @ %ld\n",
 946                                                   i, UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table->i_ino);
 947                                 }
 948                                 if (phd->unallocSpaceBitmap.extLength) {
 949                                         UDF_SB_ALLOC_BITMAP(sb, i, s_uspace);
 950                                         if (UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap != NULL) {
 951                                                 UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extLength =
 952                                                         le32_to_cpu(phd->unallocSpaceBitmap.extLength);
 953                                                 UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extPosition =
 954                                                         le32_to_cpu(phd->unallocSpaceBitmap.extPosition);
 955                                                 UDF_SB_PARTFLAGS(sb, i) |= UDF_PART_FLAG_UNALLOC_BITMAP;
 956                                                 udf_debug("unallocSpaceBitmap (part %d) @ %d\n",
 957                                                           i, UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extPosition);
 958                                         }
 959                                 }
 960                                 if (phd->partitionIntegrityTable.extLength)
 961                                         udf_debug("partitionIntegrityTable (part %d)\n", i);
 962                                 if (phd->freedSpaceTable.extLength) {
 963                                         kernel_lb_addr loc = {
 964                                                 .logicalBlockNum = le32_to_cpu(phd->freedSpaceTable.extPosition),
 965                                                 .partitionReferenceNum = i,
 966                                         };
 967
 968                                         UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table =
 969                                                 udf_iget(sb, loc);
 970                                         if (!UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table) {
 971                                                 udf_debug("cannot load freedSpaceTable (part %d)\n", i);
 972                                                 return 1;
 973                                         }
 974                                         UDF_SB_PARTFLAGS(sb, i) |= UDF_PART_FLAG_FREED_TABLE;
 975                                         udf_debug("freedSpaceTable (part %d) @ %ld\n",
 976                                                   i, UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table->i_ino);
 977                                 }
 978                                 if (phd->freedSpaceBitmap.extLength) {
 979                                         UDF_SB_ALLOC_BITMAP(sb, i, s_fspace);
 980                                         if (UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap != NULL) {
 981                                                 UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extLength =
 982                                                         le32_to_cpu(phd->freedSpaceBitmap.extLength);
 983                                                 UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extPosition =
 984                                                         le32_to_cpu(phd->freedSpaceBitmap.extPosition);
 985                                                 UDF_SB_PARTFLAGS(sb, i) |= UDF_PART_FLAG_FREED_BITMAP;
 986                                                 udf_debug("freedSpaceBitmap (part %d) @ %d\n",
 987                                                           i, UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extPosition);
 988                                         }
 989                                 }
 990                         }
 991                         break;
 992                 }
 993         }
 994         if (i == UDF_SB_NUMPARTS(sb)) {
 995                 udf_debug("Partition (%d) not found in partition map\n",
 996                           le16_to_cpu(p->partitionNumber));
 997         } else {
 998                 udf_debug("Partition (%d:%d type %x) starts at physical %d, "
 999                           "block length %d\n",
1000                           le16_to_cpu(p->partitionNumber), i,
1001                           UDF_SB_PARTTYPE(sb, i), UDF_SB_PARTROOT(sb, i),
1002                           UDF_SB_PARTLEN(sb, i));
1003         }
1004         return 0;
1005 }
1006
1007 static int udf_load_logicalvol(struct super_block *sb, struct buffer_head *bh,
1008                                kernel_lb_addr *fileset)
1009 {
1010         struct logicalVolDesc *lvd;
1011         int i, j, offset;
1012         uint8_t type;
1013
1014         lvd = (struct logicalVolDesc *)bh->b_data;
1015
1016         UDF_SB_ALLOC_PARTMAPS(sb, le32_to_cpu(lvd->numPartitionMaps));
1017
1018         for (i = 0, offset = 0;
1019              i < UDF_SB_NUMPARTS(sb) && offset < le32_to_cpu(lvd->mapTableLength);
1020              i++, offset += ((struct genericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapLength) {
1021                 type = ((struct genericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapType;
1022                 if (type == 1) {
1023                         struct genericPartitionMap1 *gpm1 = (struct genericPartitionMap1 *)&(lvd->partitionMaps[offset]);
1024                         UDF_SB_PARTTYPE(sb, i) = UDF_TYPE1_MAP15;
1025                         UDF_SB_PARTVSN(sb, i) = le16_to_cpu(gpm1->volSeqNum);
1026                         UDF_SB_PARTNUM(sb, i) = le16_to_cpu(gpm1->partitionNum);
1027                         UDF_SB_PARTFUNC(sb, i) = NULL;
1028                 } else if (type == 2) {
1029                         struct udfPartitionMap2 *upm2 = (struct udfPartitionMap2 *)&(lvd->partitionMaps[offset]);
1030                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL, strlen(UDF_ID_VIRTUAL))) {
1031                                 if (le16_to_cpu(((__le16 *)upm2->partIdent.identSuffix)[0]) == 0x0150) {
1032                                         UDF_SB_PARTTYPE(sb, i) = UDF_VIRTUAL_MAP15;
1033                                         UDF_SB_PARTFUNC(sb, i) = udf_get_pblock_virt15;
1034                                 } else if (le16_to_cpu(((__le16 *)upm2->partIdent.identSuffix)[0]) == 0x0200) {
1035                                         UDF_SB_PARTTYPE(sb, i) = UDF_VIRTUAL_MAP20;
1036                                         UDF_SB_PARTFUNC(sb, i) = udf_get_pblock_virt20;
1037                                 }
1038                         } else if (!strncmp(upm2->partIdent.ident, UDF_ID_SPARABLE, strlen(UDF_ID_SPARABLE))) {
1039                                 uint32_t loc;
1040                                 uint16_t ident;
1041                                 struct sparingTable *st;
1042                                 struct sparablePartitionMap *spm = (struct sparablePartitionMap *)&(lvd->partitionMaps[offset]);
1043
1044                                 UDF_SB_PARTTYPE(sb, i) = UDF_SPARABLE_MAP15;
1045                                 UDF_SB_TYPESPAR(sb, i).s_packet_len = le16_to_cpu(spm->packetLength);
1046                                 for (j = 0; j < spm->numSparingTables; j++) {
1047                                         loc = le32_to_cpu(spm->locSparingTable[j]);
1048                                         UDF_SB_TYPESPAR(sb, i).s_spar_map[j] =
1049                                                 udf_read_tagged(sb, loc, loc, &ident);
1050                                         if (UDF_SB_TYPESPAR(sb, i).s_spar_map[j] != NULL) {
1051                                                 st = (struct sparingTable *)UDF_SB_TYPESPAR(sb, i).s_spar_map[j]->b_data;
1052                                                 if (ident != 0 ||
1053                                                     strncmp(st->sparingIdent.ident, UDF_ID_SPARING, strlen(UDF_ID_SPARING))) {
1054                                                         brelse(UDF_SB_TYPESPAR(sb, i).s_spar_map[j]);
1055                                                         UDF_SB_TYPESPAR(sb, i).s_spar_map[j] = NULL;
1056                                                 }
1057                                         }
1058                                 }
1059                                 UDF_SB_PARTFUNC(sb, i) = udf_get_pblock_spar15;
1060                         } else {
1061                                 udf_debug("Unknown ident: %s\n",
1062                                           upm2->partIdent.ident);
1063                                 continue;
1064                         }
1065                         UDF_SB_PARTVSN(sb, i) = le16_to_cpu(upm2->volSeqNum);
1066                         UDF_SB_PARTNUM(sb, i) = le16_to_cpu(upm2->partitionNum);
1067                 }
1068                 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1069                           i, UDF_SB_PARTNUM(sb, i), type,
1070                           UDF_SB_PARTVSN(sb, i));
1071         }
1072
1073         if (fileset) {
1074                 long_ad *la = (long_ad *)&(lvd->logicalVolContentsUse[0]);
1075
1076                 *fileset = lelb_to_cpu(la->extLocation);
1077                 udf_debug("FileSet found in LogicalVolDesc at block=%d, "
1078                           "partition=%d\n", fileset->logicalBlockNum,
1079                           fileset->partitionReferenceNum);
1080         }
1081         if (lvd->integritySeqExt.extLength)
1082                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1083
1084         return 0;
1085 }
1086
1087 /*
1088  * udf_load_logicalvolint
1089  *
1090  */
1091 static void udf_load_logicalvolint(struct super_block *sb, kernel_extent_ad loc)
1092 {
1093         struct buffer_head *bh = NULL;
1094         uint16_t ident;
1095
1096         while (loc.extLength > 0 &&
1097                (bh = udf_read_tagged(sb, loc.extLocation,
1098                                      loc.extLocation, &ident)) &&
1099                ident == TAG_IDENT_LVID) {
1100                 UDF_SB_LVIDBH(sb) = bh;
1101
1102                 if (UDF_SB_LVID(sb)->nextIntegrityExt.extLength)
1103                         udf_load_logicalvolint(sb,
1104                                 leea_to_cpu(UDF_SB_LVID(sb)->nextIntegrityExt));
1105
1106                 if (UDF_SB_LVIDBH(sb) != bh)
1107                         brelse(bh);
1108                 loc.extLength -= sb->s_blocksize;
1109                 loc.extLocation++;
1110         }
1111         if (UDF_SB_LVIDBH(sb) != bh)
1112                 brelse(bh);
1113 }
1114
1115 /*
1116  * udf_process_sequence
1117  *
1118  * PURPOSE
1119  *      Process a main/reserve volume descriptor sequence.
1120  *
1121  * PRE-CONDITIONS
1122  *      sb                      Pointer to _locked_ superblock.
1123  *      block                   First block of first extent of the sequence.
1124  *      lastblock               Lastblock of first extent of the sequence.
1125  *
1126  * HISTORY
1127  *      July 1, 1997 - Andrew E. Mileski
1128  *      Written, tested, and released.
1129  */
1130 static int udf_process_sequence(struct super_block *sb, long block,
1131                                 long lastblock, kernel_lb_addr *fileset)
1132 {
1133         struct buffer_head *bh = NULL;
1134         struct udf_vds_record vds[VDS_POS_LENGTH];
1135         struct generic_desc *gd;
1136         struct volDescPtr *vdp;
1137         int done = 0;
1138         int i, j;
1139         uint32_t vdsn;
1140         uint16_t ident;
1141         long next_s = 0, next_e = 0;
1142
1143         memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1144
1145         /* Read the main descriptor sequence */
1146         for (; (!done && block <= lastblock); block++) {
1147
1148                 bh = udf_read_tagged(sb, block, block, &ident);
1149                 if (!bh)
1150                         break;
1151
1152                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1153                 gd = (struct generic_desc *)bh->b_data;
1154                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1155                 switch (ident) {
1156                 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1157                         if (vdsn >= vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum) {
1158                                 vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum = vdsn;
1159                                 vds[VDS_POS_PRIMARY_VOL_DESC].block = block;
1160                         }
1161                         break;
1162                 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1163                         if (vdsn >= vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum) {
1164                                 vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum = vdsn;
1165                                 vds[VDS_POS_VOL_DESC_PTR].block = block;
1166
1167                                 vdp = (struct volDescPtr *)bh->b_data;
1168                                 next_s = le32_to_cpu(vdp->nextVolDescSeqExt.extLocation);
1169                                 next_e = le32_to_cpu(vdp->nextVolDescSeqExt.extLength);
1170                                 next_e = next_e >> sb->s_blocksize_bits;
1171                                 next_e += next_s;
1172                         }
1173                         break;
1174                 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1175                         if (vdsn >= vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum) {
1176                                 vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum = vdsn;
1177                                 vds[VDS_POS_IMP_USE_VOL_DESC].block = block;
1178                         }
1179                         break;
1180                 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1181                         if (!vds[VDS_POS_PARTITION_DESC].block)
1182                                 vds[VDS_POS_PARTITION_DESC].block = block;
1183                         break;
1184                 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1185                         if (vdsn >= vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum) {
1186                                 vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum = vdsn;
1187                                 vds[VDS_POS_LOGICAL_VOL_DESC].block = block;
1188                         }
1189                         break;
1190                 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1191                         if (vdsn >= vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum) {
1192                                 vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum = vdsn;
1193                                 vds[VDS_POS_UNALLOC_SPACE_DESC].block = block;
1194                         }
1195                         break;
1196                 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1197                         vds[VDS_POS_TERMINATING_DESC].block = block;
1198                         if (next_e) {
1199                                 block = next_s;
1200                                 lastblock = next_e;
1201                                 next_s = next_e = 0;
1202                         } else {
1203                                 done = 1;
1204                         }
1205                         break;
1206                 }
1207                 brelse(bh);
1208         }
1209         for (i = 0; i < VDS_POS_LENGTH; i++) {
1210                 if (vds[i].block) {
1211                         bh = udf_read_tagged(sb, vds[i].block, vds[i].block,
1212                                              &ident);
1213
1214                         if (i == VDS_POS_PRIMARY_VOL_DESC) {
1215                                 udf_load_pvoldesc(sb, bh);
1216                         } else if (i == VDS_POS_LOGICAL_VOL_DESC) {
1217                                 udf_load_logicalvol(sb, bh, fileset);
1218                         } else if (i == VDS_POS_PARTITION_DESC) {
1219                                 struct buffer_head *bh2 = NULL;
1220                                 if (udf_load_partdesc(sb, bh)) {
1221                                         brelse(bh);
1222                                         return 1;
1223                                 }
1224                                 for (j = vds[i].block + 1;
1225                                      j <  vds[VDS_POS_TERMINATING_DESC].block;
1226                                      j++) {
1227                                         bh2 = udf_read_tagged(sb, j, j, &ident);
1228                                         gd = (struct generic_desc *)bh2->b_data;
1229                                         if (ident == TAG_IDENT_PD)
1230                                                 if (udf_load_partdesc(sb,
1231                                                                       bh2)) {
1232                                                         brelse(bh);
1233                                                         brelse(bh2);
1234                                                         return 1;
1235                                                 }
1236                                         brelse(bh2);
1237                                 }
1238                         }
1239                         brelse(bh);
1240                 }
1241         }
1242
1243         return 0;
1244 }
1245
1246 /*
1247  * udf_check_valid()
1248  */
1249 static int udf_check_valid(struct super_block *sb, int novrs, int silent)
1250 {
1251         long block;
1252
1253         if (novrs) {
1254                 udf_debug("Validity check skipped because of novrs option\n");
1255                 return 0;
1256         }
1257         /* Check that it is NSR02 compliant */
1258         /* Process any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
1259         else {
1260                 block = udf_vrs(sb, silent);
1261                 if (block == -1) {
1262                         udf_debug("Failed to read byte 32768. Assuming open "
1263                                   "disc. Skipping validity check\n");
1264                         if (!UDF_SB_LASTBLOCK(sb))
1265                                 UDF_SB_LASTBLOCK(sb) = udf_get_last_block(sb);
1266                         return 0;
1267                 } else
1268                         return !block;
1269         }
1270 }
1271
1272 static int udf_load_partition(struct super_block *sb, kernel_lb_addr *fileset)
1273 {
1274         struct anchorVolDescPtr *anchor;
1275         uint16_t ident;
1276         struct buffer_head *bh;
1277         long main_s, main_e, reserve_s, reserve_e;
1278         int i, j;
1279
1280         if (!sb)
1281                 return 1;
1282
1283         for (i = 0; i < ARRAY_SIZE(UDF_SB_ANCHOR(sb)); i++) {
1284                 if (UDF_SB_ANCHOR(sb)[i] &&
1285                     (bh = udf_read_tagged(sb, UDF_SB_ANCHOR(sb)[i],
1286                                           UDF_SB_ANCHOR(sb)[i], &ident))) {
1287                         anchor = (struct anchorVolDescPtr *)bh->b_data;
1288
1289                         /* Locate the main sequence */
1290                         main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1291                         main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1292                         main_e = main_e >> sb->s_blocksize_bits;
1293                         main_e += main_s;
1294
1295                         /* Locate the reserve sequence */
1296                         reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1297                         reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1298                         reserve_e = reserve_e >> sb->s_blocksize_bits;
1299                         reserve_e += reserve_s;
1300
1301                         brelse(bh);
1302
1303                         /* Process the main & reserve sequences */
1304                         /* responsible for finding the PartitionDesc(s) */
1305                         if (!(udf_process_sequence(sb, main_s, main_e, fileset) &&
1306                               udf_process_sequence(sb, reserve_s, reserve_e, fileset)))
1307                                 break;
1308                 }
1309         }
1310
1311         if (i == ARRAY_SIZE(UDF_SB_ANCHOR(sb))) {
1312                 udf_debug("No Anchor block found\n");
1313                 return 1;
1314         } else
1315                 udf_debug("Using anchor in block %d\n", UDF_SB_ANCHOR(sb)[i]);
1316
1317         for (i = 0; i < UDF_SB_NUMPARTS(sb); i++) {
1318                 kernel_lb_addr uninitialized_var(ino);
1319                 switch (UDF_SB_PARTTYPE(sb, i)) {
1320                 case UDF_VIRTUAL_MAP15:
1321                 case UDF_VIRTUAL_MAP20:
1322                         if (!UDF_SB_LASTBLOCK(sb)) {
1323                                 UDF_SB_LASTBLOCK(sb) = udf_get_last_block(sb);
1324                                 udf_find_anchor(sb);
1325                         }
1326
1327                         if (!UDF_SB_LASTBLOCK(sb)) {
1328                                 udf_debug("Unable to determine Lastblock (For "
1329                                           "Virtual Partition)\n");
1330                                 return 1;
1331                         }
1332
1333                         for (j = 0; j < UDF_SB_NUMPARTS(sb); j++) {
1334                                 if (j != i &&
1335                                     UDF_SB_PARTVSN(sb, i) == UDF_SB_PARTVSN(sb, j) &&
1336                                     UDF_SB_PARTNUM(sb, i) == UDF_SB_PARTNUM(sb, j)) {
1337                                         ino.partitionReferenceNum = j;
1338                                         ino.logicalBlockNum = UDF_SB_LASTBLOCK(sb) - UDF_SB_PARTROOT(sb, j);
1339                                         break;
1340                                 }
1341                         }
1342
1343                         if (j == UDF_SB_NUMPARTS(sb))
1344                                 return 1;
1345
1346                         UDF_SB_VAT(sb) = udf_iget(sb, ino);
1347                         if (!UDF_SB_VAT(sb))
1348                                 return 1;
1349
1350                         if (UDF_SB_PARTTYPE(sb, i) == UDF_VIRTUAL_MAP15) {
1351                                 UDF_SB_TYPEVIRT(sb, i).s_start_offset =
1352                                         udf_ext0_offset(UDF_SB_VAT(sb));
1353                                 UDF_SB_TYPEVIRT(sb, i).s_num_entries =
1354                                         (UDF_SB_VAT(sb)->i_size - 36) >> 2;
1355                         } else if (UDF_SB_PARTTYPE(sb, i) == UDF_VIRTUAL_MAP20) {
1356                                 struct buffer_head *bh = NULL;
1357                                 uint32_t pos;
1358
1359                                 pos = udf_block_map(UDF_SB_VAT(sb), 0);
1360                                 bh = sb_bread(sb, pos);
1361                                 if (!bh)
1362                                         return 1;
1363                                 UDF_SB_TYPEVIRT(sb, i).s_start_offset =
1364                                         le16_to_cpu(((struct virtualAllocationTable20 *)bh->b_data +
1365                                                      udf_ext0_offset(UDF_SB_VAT(sb)))->lengthHeader) +
1366                                         udf_ext0_offset(UDF_SB_VAT(sb));
1367                                 UDF_SB_TYPEVIRT(sb, i).s_num_entries = (UDF_SB_VAT(sb)->i_size -
1368                                                                         UDF_SB_TYPEVIRT(sb, i).s_start_offset) >> 2;
1369                                 brelse(bh);
1370                         }
1371                         UDF_SB_PARTROOT(sb, i) = udf_get_pblock(sb, 0, i, 0);
1372                         UDF_SB_PARTLEN(sb, i) = UDF_SB_PARTLEN(sb, ino.partitionReferenceNum);
1373                 }
1374         }
1375         return 0;
1376 }
1377
1378 static void udf_open_lvid(struct super_block *sb)
1379 {
1380         if (UDF_SB_LVIDBH(sb)) {
1381                 int i;
1382                 kernel_timestamp cpu_time;
1383
1384                 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1385                 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1386                 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
1387                         UDF_SB_LVID(sb)->recordingDateAndTime = cpu_to_lets(cpu_time);
1388                 UDF_SB_LVID(sb)->integrityType = LVID_INTEGRITY_TYPE_OPEN;
1389
1390                 UDF_SB_LVID(sb)->descTag.descCRC = cpu_to_le16(udf_crc((char *)UDF_SB_LVID(sb) + sizeof(tag),
1391                                                                        le16_to_cpu(UDF_SB_LVID(sb)->descTag.descCRCLength), 0));
1392
1393                 UDF_SB_LVID(sb)->descTag.tagChecksum = 0;
1394                 for (i = 0; i < 16; i++)
1395                         if (i != 4)
1396                                 UDF_SB_LVID(sb)->descTag.tagChecksum +=
1397                                         ((uint8_t *) &(UDF_SB_LVID(sb)->descTag))[i];
1398
1399                 mark_buffer_dirty(UDF_SB_LVIDBH(sb));
1400         }
1401 }
1402
1403 static void udf_close_lvid(struct super_block *sb)
1404 {
1405         kernel_timestamp cpu_time;
1406         int i;
1407
1408         if (UDF_SB_LVIDBH(sb) &&
1409             UDF_SB_LVID(sb)->integrityType == LVID_INTEGRITY_TYPE_OPEN) {
1410                 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1411                 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1412                 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
1413                         UDF_SB_LVID(sb)->recordingDateAndTime = cpu_to_lets(cpu_time);
1414                 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(UDF_SB_LVIDIU(sb)->maxUDFWriteRev))
1415                         UDF_SB_LVIDIU(sb)->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1416                 if (UDF_SB_UDFREV(sb) > le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev))
1417                         UDF_SB_LVIDIU(sb)->minUDFReadRev = cpu_to_le16(UDF_SB_UDFREV(sb));
1418                 if (UDF_SB_UDFREV(sb) > le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev))
1419                         UDF_SB_LVIDIU(sb)->minUDFWriteRev = cpu_to_le16(UDF_SB_UDFREV(sb));
1420                 UDF_SB_LVID(sb)->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1421
1422                 UDF_SB_LVID(sb)->descTag.descCRC =
1423                         cpu_to_le16(udf_crc((char *)UDF_SB_LVID(sb) + sizeof(tag),
1424                                             le16_to_cpu(UDF_SB_LVID(sb)->descTag.descCRCLength), 0));
1425
1426                 UDF_SB_LVID(sb)->descTag.tagChecksum = 0;
1427                 for (i = 0; i < 16; i++)
1428                         if (i != 4)
1429                                 UDF_SB_LVID(sb)->descTag.tagChecksum +=
1430                                         ((uint8_t *)&(UDF_SB_LVID(sb)->descTag))[i];
1431
1432                 mark_buffer_dirty(UDF_SB_LVIDBH(sb));
1433         }
1434 }
1435
1436 /*
1437  * udf_read_super
1438  *
1439  * PURPOSE
1440  *      Complete the specified super block.
1441  *
1442  * PRE-CONDITIONS
1443  *      sb                      Pointer to superblock to complete - never NULL.
1444  *      sb->s_dev               Device to read suberblock from.
1445  *      options                 Pointer to mount options.
1446  *      silent                  Silent flag.
1447  *
1448  * HISTORY
1449  *      July 1, 1997 - Andrew E. Mileski
1450  *      Written, tested, and released.
1451  */
1452 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1453 {
1454         int i;
1455         struct inode *inode = NULL;
1456         struct udf_options uopt;
1457         kernel_lb_addr rootdir, fileset;
1458         struct udf_sb_info *sbi;
1459
1460         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1461         uopt.uid = -1;
1462         uopt.gid = -1;
1463         uopt.umask = 0;
1464
1465         sbi = kmalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1466         if (!sbi)
1467                 return -ENOMEM;
1468
1469         sb->s_fs_info = sbi;
1470         memset(UDF_SB(sb), 0x00, sizeof(struct udf_sb_info));
1471
1472         mutex_init(&sbi->s_alloc_mutex);
1473
1474         if (!udf_parse_options((char *)options, &uopt))
1475                 goto error_out;
1476
1477         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1478             uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
1479                 udf_error(sb, "udf_read_super",
1480                           "utf8 cannot be combined with iocharset\n");
1481                 goto error_out;
1482         }
1483 #ifdef CONFIG_UDF_NLS
1484         if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1485                 uopt.nls_map = load_nls_default();
1486                 if (!uopt.nls_map)
1487                         uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1488                 else
1489                         udf_debug("Using default NLS map\n");
1490         }
1491 #endif
1492         if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1493                 uopt.flags |= (1 << UDF_FLAG_UTF8);
1494
1495         fileset.logicalBlockNum = 0xFFFFFFFF;
1496         fileset.partitionReferenceNum = 0xFFFF;
1497
1498         UDF_SB(sb)->s_flags = uopt.flags;
1499         UDF_SB(sb)->s_uid = uopt.uid;
1500         UDF_SB(sb)->s_gid = uopt.gid;
1501         UDF_SB(sb)->s_umask = uopt.umask;
1502         UDF_SB(sb)->s_nls_map = uopt.nls_map;
1503
1504         /* Set the block size for all transfers */
1505         if (!udf_set_blocksize(sb, uopt.blocksize))
1506                 goto error_out;
1507
1508         if (uopt.session == 0xFFFFFFFF)
1509                 UDF_SB_SESSION(sb) = udf_get_last_session(sb);
1510         else
1511                 UDF_SB_SESSION(sb) = uopt.session;
1512
1513         udf_debug("Multi-session=%d\n", UDF_SB_SESSION(sb));
1514
1515         UDF_SB_LASTBLOCK(sb) = uopt.lastblock;
1516         UDF_SB_ANCHOR(sb)[0] = UDF_SB_ANCHOR(sb)[1] = 0;
1517         UDF_SB_ANCHOR(sb)[2] = uopt.anchor;
1518         UDF_SB_ANCHOR(sb)[3] = 256;
1519
1520         if (udf_check_valid(sb, uopt.novrs, silent)) {
1521                 /* read volume recognition sequences */
1522                 printk(KERN_WARNING "UDF-fs: No VRS found\n");
1523                 goto error_out;
1524         }
1525
1526         udf_find_anchor(sb);
1527
1528         /* Fill in the rest of the superblock */
1529         sb->s_op = &udf_sb_ops;
1530         sb->dq_op = NULL;
1531         sb->s_dirt = 0;
1532         sb->s_magic = UDF_SUPER_MAGIC;
1533         sb->s_time_gran = 1000;
1534
1535         if (udf_load_partition(sb, &fileset)) {
1536                 printk(KERN_WARNING "UDF-fs: No partition found (1)\n");
1537                 goto error_out;
1538         }
1539
1540         udf_debug("Lastblock=%d\n", UDF_SB_LASTBLOCK(sb));
1541
1542         if (UDF_SB_LVIDBH(sb)) {
1543                 uint16_t minUDFReadRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev);
1544                 uint16_t minUDFWriteRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev);
1545                 /* uint16_t maxUDFWriteRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->maxUDFWriteRev); */
1546
1547                 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
1548                         printk(KERN_ERR "UDF-fs: minUDFReadRev=%x (max is %x)\n",
1549                                le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev),
1550                                UDF_MAX_READ_VERSION);
1551                         goto error_out;
1552                 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION) {
1553                         sb->s_flags |= MS_RDONLY;
1554                 }
1555
1556                 UDF_SB_UDFREV(sb) = minUDFWriteRev;
1557
1558                 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1559                         UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
1560                 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
1561                         UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
1562         }
1563
1564         if (!UDF_SB_NUMPARTS(sb)) {
1565                 printk(KERN_WARNING "UDF-fs: No partition found (2)\n");
1566                 goto error_out;
1567         }
1568
1569         if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_READ_ONLY) {
1570                 printk(KERN_NOTICE "UDF-fs: Partition marked readonly; forcing readonly mount\n");
1571                 sb->s_flags |= MS_RDONLY;
1572         }
1573
1574         if (udf_find_fileset(sb, &fileset, &rootdir)) {
1575                 printk(KERN_WARNING "UDF-fs: No fileset found\n");
1576                 goto error_out;
1577         }
1578
1579         if (!silent) {
1580                 kernel_timestamp ts;
1581                 udf_time_to_stamp(&ts, UDF_SB_RECORDTIME(sb));
1582                 udf_info("UDF %s (%s) Mounting volume '%s', "
1583                          "timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
1584                          UDFFS_VERSION, UDFFS_DATE,
1585                          UDF_SB_VOLIDENT(sb), ts.year, ts.month, ts.day, ts.hour, ts.minute,
1586                          ts.typeAndTimezone);
1587         }
1588         if (!(sb->s_flags & MS_RDONLY))
1589                 udf_open_lvid(sb);
1590
1591         /* Assign the root inode */
1592         /* assign inodes by physical block number */
1593         /* perhaps it's not extensible enough, but for now ... */
1594         inode = udf_iget(sb, rootdir);
1595         if (!inode) {
1596                 printk(KERN_ERR "UDF-fs: Error in udf_iget, block=%d, partition=%d\n",
1597                        rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
1598                 goto error_out;
1599         }
1600
1601         /* Allocate a dentry for the root inode */
1602         sb->s_root = d_alloc_root(inode);
1603         if (!sb->s_root) {
1604                 printk(KERN_ERR "UDF-fs: Couldn't allocate root dentry\n");
1605                 iput(inode);
1606                 goto error_out;
1607         }
1608         sb->s_maxbytes = MAX_LFS_FILESIZE;
1609         return 0;
1610
1611 error_out:
1612         if (UDF_SB_VAT(sb))
1613                 iput(UDF_SB_VAT(sb));
1614         if (UDF_SB_NUMPARTS(sb)) {
1615                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1616                         iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1617                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1618                         iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1619                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1620                         UDF_SB_FREE_BITMAP(sb, UDF_SB_PARTITION(sb), s_uspace);
1621                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1622                         UDF_SB_FREE_BITMAP(sb, UDF_SB_PARTITION(sb), s_fspace);
1623                 if (UDF_SB_PARTTYPE(sb, UDF_SB_PARTITION(sb)) == UDF_SPARABLE_MAP15) {
1624                         for (i = 0; i < 4; i++)
1625                                 brelse(UDF_SB_TYPESPAR(sb, UDF_SB_PARTITION(sb)).s_spar_map[i]);
1626                 }
1627         }
1628 #ifdef CONFIG_UDF_NLS
1629         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1630                 unload_nls(UDF_SB(sb)->s_nls_map);
1631 #endif
1632         if (!(sb->s_flags & MS_RDONLY))
1633                 udf_close_lvid(sb);
1634         brelse(UDF_SB_LVIDBH(sb));
1635         UDF_SB_FREE(sb);
1636         kfree(sbi);
1637         sb->s_fs_info = NULL;
1638
1639         return -EINVAL;
1640 }
1641
1642 void udf_error(struct super_block *sb, const char *function,
1643                const char *fmt, ...)
1644 {
1645         va_list args;
1646
1647         if (!(sb->s_flags & MS_RDONLY)) {
1648                 /* mark sb error */
1649                 sb->s_dirt = 1;
1650         }
1651         va_start(args, fmt);
1652         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1653         va_end(args);
1654         printk(KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
1655                 sb->s_id, function, error_buf);
1656 }
1657
1658 void udf_warning(struct super_block *sb, const char *function,
1659                  const char *fmt, ...)
1660 {
1661         va_list args;
1662
1663         va_start(args, fmt);
1664         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1665         va_end(args);
1666         printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
1667                sb->s_id, function, error_buf);
1668 }
1669
1670 /*
1671  * udf_put_super
1672  *
1673  * PURPOSE
1674  *      Prepare for destruction of the superblock.
1675  *
1676  * DESCRIPTION
1677  *      Called before the filesystem is unmounted.
1678  *
1679  * HISTORY
1680  *      July 1, 1997 - Andrew E. Mileski
1681  *      Written, tested, and released.
1682  */
1683 static void udf_put_super(struct super_block *sb)
1684 {
1685         int i;
1686
1687         if (UDF_SB_VAT(sb))
1688                 iput(UDF_SB_VAT(sb));
1689         if (UDF_SB_NUMPARTS(sb)) {
1690                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1691                         iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1692                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1693                         iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1694                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1695                         UDF_SB_FREE_BITMAP(sb, UDF_SB_PARTITION(sb), s_uspace);
1696                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1697                         UDF_SB_FREE_BITMAP(sb, UDF_SB_PARTITION(sb), s_fspace);
1698                 if (UDF_SB_PARTTYPE(sb, UDF_SB_PARTITION(sb)) == UDF_SPARABLE_MAP15) {
1699                         for (i = 0; i < 4; i++)
1700                                 brelse(UDF_SB_TYPESPAR(sb, UDF_SB_PARTITION(sb)).s_spar_map[i]);
1701                 }
1702         }
1703 #ifdef CONFIG_UDF_NLS
1704         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1705                 unload_nls(UDF_SB(sb)->s_nls_map);
1706 #endif
1707         if (!(sb->s_flags & MS_RDONLY))
1708                 udf_close_lvid(sb);
1709         brelse(UDF_SB_LVIDBH(sb));
1710         UDF_SB_FREE(sb);
1711         kfree(sb->s_fs_info);
1712         sb->s_fs_info = NULL;
1713 }
1714
1715 /*
1716  * udf_stat_fs
1717  *
1718  * PURPOSE
1719  *      Return info about the filesystem.
1720  *
1721  * DESCRIPTION
1722  *      Called by sys_statfs()
1723  *
1724  * HISTORY
1725  *      July 1, 1997 - Andrew E. Mileski
1726  *      Written, tested, and released.
1727  */
1728 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
1729 {
1730         struct super_block *sb = dentry->d_sb;
1731
1732         buf->f_type = UDF_SUPER_MAGIC;
1733         buf->f_bsize = sb->s_blocksize;
1734         buf->f_blocks = UDF_SB_PARTLEN(sb, UDF_SB_PARTITION(sb));
1735         buf->f_bfree = udf_count_free(sb);
1736         buf->f_bavail = buf->f_bfree;
1737         buf->f_files = (UDF_SB_LVIDBH(sb) ?
1738                         (le32_to_cpu(UDF_SB_LVIDIU(sb)->numFiles) +
1739                          le32_to_cpu(UDF_SB_LVIDIU(sb)->numDirs)) : 0) + buf->f_bfree;
1740         buf->f_ffree = buf->f_bfree;
1741         /* __kernel_fsid_t f_fsid */
1742         buf->f_namelen = UDF_NAME_LEN - 2;
1743
1744         return 0;
1745 }
1746
1747 static unsigned char udf_bitmap_lookup[16] = {
1748         0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4
1749 };
1750
1751 static unsigned int udf_count_free_bitmap(struct super_block *sb, struct udf_bitmap *bitmap)
1752 {
1753         struct buffer_head *bh = NULL;
1754         unsigned int accum = 0;
1755         int index;
1756         int block = 0, newblock;
1757         kernel_lb_addr loc;
1758         uint32_t bytes;
1759         uint8_t value;
1760         uint8_t *ptr;
1761         uint16_t ident;
1762         struct spaceBitmapDesc *bm;
1763
1764         lock_kernel();
1765
1766         loc.logicalBlockNum = bitmap->s_extPosition;
1767         loc.partitionReferenceNum = UDF_SB_PARTITION(sb);
1768         bh = udf_read_ptagged(sb, loc, 0, &ident);
1769
1770         if (!bh) {
1771                 printk(KERN_ERR "udf: udf_count_free failed\n");
1772                 goto out;
1773         } else if (ident != TAG_IDENT_SBD) {
1774                 brelse(bh);
1775                 printk(KERN_ERR "udf: udf_count_free failed\n");
1776                 goto out;
1777         }
1778
1779         bm = (struct spaceBitmapDesc *)bh->b_data;
1780         bytes = le32_to_cpu(bm->numOfBytes);
1781         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
1782         ptr = (uint8_t *)bh->b_data;
1783
1784         while (bytes > 0) {
1785                 while ((bytes > 0) && (index < sb->s_blocksize)) {
1786                         value = ptr[index];
1787                         accum += udf_bitmap_lookup[value & 0x0f];
1788                         accum += udf_bitmap_lookup[value >> 4];
1789                         index++;
1790                         bytes--;
1791                 }
1792                 if (bytes) {
1793                         brelse(bh);
1794                         newblock = udf_get_lb_pblock(sb, loc, ++block);
1795                         bh = udf_tread(sb, newblock);
1796                         if (!bh) {
1797                                 udf_debug("read failed\n");
1798                                 goto out;
1799                         }
1800                         index = 0;
1801                         ptr = (uint8_t *)bh->b_data;
1802                 }
1803         }
1804         brelse(bh);
1805
1806 out:
1807         unlock_kernel();
1808
1809         return accum;
1810 }
1811
1812 static unsigned int udf_count_free_table(struct super_block *sb, struct inode *table)
1813 {
1814         unsigned int accum = 0;
1815         uint32_t elen;
1816         kernel_lb_addr eloc;
1817         int8_t etype;
1818         struct extent_position epos;
1819
1820         lock_kernel();
1821
1822         epos.block = UDF_I_LOCATION(table);
1823         epos.offset = sizeof(struct unallocSpaceEntry);
1824         epos.bh = NULL;
1825
1826         while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
1827                 accum += (elen >> table->i_sb->s_blocksize_bits);
1828
1829         brelse(epos.bh);
1830
1831         unlock_kernel();
1832
1833         return accum;
1834 }
1835
1836 static unsigned int udf_count_free(struct super_block *sb)
1837 {
1838         unsigned int accum = 0;
1839
1840         if (UDF_SB_LVIDBH(sb)) {
1841                 if (le32_to_cpu(UDF_SB_LVID(sb)->numOfPartitions) > UDF_SB_PARTITION(sb)) {
1842                         accum = le32_to_cpu(UDF_SB_LVID(sb)->freeSpaceTable[UDF_SB_PARTITION(sb)]);
1843                         if (accum == 0xFFFFFFFF)
1844                                 accum = 0;
1845                 }
1846         }
1847
1848         if (accum)
1849                 return accum;
1850
1851         if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP) {
1852                 accum += udf_count_free_bitmap(sb,
1853                                                UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_bitmap);
1854         }
1855         if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP) {
1856                 accum += udf_count_free_bitmap(sb,
1857                                                UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_bitmap);
1858         }
1859         if (accum)
1860                 return accum;
1861
1862         if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE) {
1863                 accum += udf_count_free_table(sb,
1864                                               UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1865         }
1866         if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE) {
1867                 accum += udf_count_free_table(sb,
1868                                               UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1869         }
1870
1871         return accum;
1872 }