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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 vol descs
  37  *                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 *, kernel_lb_addr *);
  84 static void udf_load_logicalvolint(struct super_block *, kernel_extent_ad);
  85 static void udf_find_anchor(struct super_block *);
  86 static int udf_find_fileset(struct super_block *, kernel_lb_addr *, kernel_lb_addr *);
  87 static void udf_load_pvoldesc(struct super_block *, struct buffer_head *);
  88 static void udf_load_fileset(struct super_block *, struct buffer_head *, kernel_lb_addr *);
  89 static void udf_load_partdesc(struct super_block *, struct buffer_head *);
  90 static void udf_open_lvid(struct super_block *);
  91 static void udf_close_lvid(struct super_block *);
  92 static unsigned int udf_count_free(struct super_block *);
  93 static int udf_statfs(struct dentry *, struct kstatfs *);
  94
  95 /* UDF filesystem type */
  96 static int udf_get_sb(struct file_system_type *fs_type,
  97         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
  98 {
  99         return get_sb_bdev(fs_type, flags, dev_name, data, udf_fill_super, mnt);
 100 }
 101
 102 static struct file_system_type udf_fstype = {
 103         .owner          = THIS_MODULE,
 104         .name           = "udf",
 105         .get_sb         = udf_get_sb,
 106         .kill_sb        = kill_block_super,
 107         .fs_flags       = FS_REQUIRES_DEV,
 108 };
 109
 110 static kmem_cache_t * udf_inode_cachep;
 111
 112 static struct inode *udf_alloc_inode(struct super_block *sb)
 113 {
 114         struct udf_inode_info *ei;
 115         ei = (struct udf_inode_info *)kmem_cache_alloc(udf_inode_cachep, SLAB_KERNEL);
 116         if (!ei)
 117                 return NULL;
 118
 119         ei->i_unique = 0;
 120         ei->i_lenExtents = 0;
 121         ei->i_next_alloc_block = 0;
 122         ei->i_next_alloc_goal = 0;
 123         ei->i_strat4096 = 0;
 124
 125         return &ei->vfs_inode;
 126 }
 127
 128 static void udf_destroy_inode(struct inode *inode)
 129 {
 130         kmem_cache_free(udf_inode_cachep, UDF_I(inode));
 131 }
 132
 133 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
 134 {
 135         struct udf_inode_info *ei = (struct udf_inode_info *) foo;
 136
 137         if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
 138             SLAB_CTOR_CONSTRUCTOR)
 139         {
 140                 ei->i_ext.i_data = NULL;
 141                 inode_init_once(&ei->vfs_inode);
 142         }
 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, NULL);
 152         if (udf_inode_cachep == NULL)
 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 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 {
 177         unsigned char novrs;
 178         unsigned int blocksize;
 179         unsigned int session;
 180         unsigned int lastblock;
 181         unsigned int anchor;
 182         unsigned int volume;
 183         unsigned short partition;
 184         unsigned int fileset;
 185         unsigned int rootdir;
 186         unsigned int flags;
 187         mode_t umask;
 188         gid_t gid;
 189         uid_t uid;
 190         struct nls_table *nls_map;
 191 };
 192
 193 static int __init init_udf_fs(void)
 194 {
 195         int err;
 196         err = init_inodecache();
 197         if (err)
 198                 goto out1;
 199         err = register_filesystem(&udf_fstype);
 200         if (err)
 201                 goto out;
 202         return 0;
 203 out:
 204         destroy_inodecache();
 205 out1:
 206         return err;
 207 }
 208
 209 static void __exit exit_udf_fs(void)
 210 {
 211         unregister_filesystem(&udf_fstype);
 212         destroy_inodecache();
 213 }
 214
 215 module_init(init_udf_fs)
 216 module_exit(exit_udf_fs)
 217
 218 /*
 219  * udf_parse_options
 220  *
 221  * PURPOSE
 222  *      Parse mount options.
 223  *
 224  * DESCRIPTION
 225  *      The following mount options are supported:
 226  *
 227  *      gid=            Set the default group.
 228  *      umask=          Set the default umask.
 229  *      uid=            Set the default user.
 230  *      bs=             Set the block size.
 231  *      unhide          Show otherwise hidden files.
 232  *      undelete        Show deleted files in lists.
 233  *      adinicb         Embed data in the inode (default)
 234  *      noadinicb       Don't embed data in the inode
 235  *      shortad         Use short ad's
 236  *      longad          Use long ad's (default)
 237  *      nostrict        Unset strict conformance
 238  *      iocharset=      Set the NLS character set
 239  *
 240  *      The remaining are for debugging and disaster recovery:
 241  *
 242  *      novrs           Skip volume sequence recognition
 243  *
 244  *      The following expect a offset from 0.
 245  *
 246  *      session=        Set the CDROM session (default= last session)
 247  *      anchor=         Override standard anchor location. (default= 256)
 248  *      volume=         Override the VolumeDesc location. (unused)
 249  *      partition=      Override the PartitionDesc location. (unused)
 250  *      lastblock=      Set the last block of the filesystem/
 251  *
 252  *      The following expect a offset from the partition root.
 253  *
 254  *      fileset=        Override the fileset block location. (unused)
 255  *      rootdir=        Override the root directory location. (unused)
 256  *              WARNING: overriding the rootdir to a non-directory may
 257  *              yield highly unpredictable results.
 258  *
 259  * PRE-CONDITIONS
 260  *      options         Pointer to mount options string.
 261  *      uopts           Pointer to mount options variable.
 262  *
 263  * POST-CONDITIONS
 264  *      <return>        1       Mount options parsed okay.
 265  *      <return>        0       Error parsing mount options.
 266  *
 267  * HISTORY
 268  *      July 1, 1997 - Andrew E. Mileski
 269  *      Written, tested, and released.
 270  */
 271
 272 enum {
 273         Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
 274         Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
 275         Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
 276         Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
 277         Opt_rootdir, Opt_utf8, Opt_iocharset,
 278         Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore
 279 };
 280
 281 static match_table_t tokens = {
 282         {Opt_novrs, "novrs"},
 283         {Opt_nostrict, "nostrict"},
 284         {Opt_bs, "bs=%u"},
 285         {Opt_unhide, "unhide"},
 286         {Opt_undelete, "undelete"},
 287         {Opt_noadinicb, "noadinicb"},
 288         {Opt_adinicb, "adinicb"},
 289         {Opt_shortad, "shortad"},
 290         {Opt_longad, "longad"},
 291         {Opt_uforget, "uid=forget"},
 292         {Opt_uignore, "uid=ignore"},
 293         {Opt_gforget, "gid=forget"},
 294         {Opt_gignore, "gid=ignore"},
 295         {Opt_gid, "gid=%u"},
 296         {Opt_uid, "uid=%u"},
 297         {Opt_umask, "umask=%o"},
 298         {Opt_session, "session=%u"},
 299         {Opt_lastblock, "lastblock=%u"},
 300         {Opt_anchor, "anchor=%u"},
 301         {Opt_volume, "volume=%u"},
 302         {Opt_partition, "partition=%u"},
 303         {Opt_fileset, "fileset=%u"},
 304         {Opt_rootdir, "rootdir=%u"},
 305         {Opt_utf8, "utf8"},
 306         {Opt_iocharset, "iocharset=%s"},
 307         {Opt_err, NULL}
 308 };
 309
 310 static int
 311 udf_parse_options(char *options, struct udf_options *uopt)
 312 {
 313         char *p;
 314         int option;
 315
 316         uopt->novrs = 0;
 317         uopt->blocksize = 2048;
 318         uopt->partition = 0xFFFF;
 319         uopt->session = 0xFFFFFFFF;
 320         uopt->lastblock = 0;
 321         uopt->anchor = 0;
 322         uopt->volume = 0xFFFFFFFF;
 323         uopt->rootdir = 0xFFFFFFFF;
 324         uopt->fileset = 0xFFFFFFFF;
 325         uopt->nls_map = NULL;
 326
 327         if (!options)
 328                 return 1;
 329
 330         while ((p = strsep(&options, ",")) != NULL)
 331         {
 332                 substring_t args[MAX_OPT_ARGS];
 333                 int token;
 334                 if (!*p)
 335                         continue;
 336
 337                 token = match_token(p, tokens, args);
 338                 switch (token)
 339                 {
 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                                 break;
 370                         case Opt_uid:
 371                                 if (match_int(args, &option))
 372                                         return 0;
 373                                 uopt->uid = option;
 374                                 break;
 375                         case Opt_umask:
 376                                 if (match_octal(args, &option))
 377                                         return 0;
 378                                 uopt->umask = option;
 379                                 break;
 380                         case Opt_nostrict:
 381                                 uopt->flags &= ~(1 << UDF_FLAG_STRICT);
 382                                 break;
 383                         case Opt_session:
 384                                 if (match_int(args, &option))
 385                                         return 0;
 386                                 uopt->session = option;
 387                                 break;
 388                         case Opt_lastblock:
 389                                 if (match_int(args, &option))
 390                                         return 0;
 391                                 uopt->lastblock = option;
 392                                 break;
 393                         case Opt_anchor:
 394                                 if (match_int(args, &option))
 395                                         return 0;
 396                                 uopt->anchor = option;
 397                                 break;
 398                         case Opt_volume:
 399                                 if (match_int(args, &option))
 400                                         return 0;
 401                                 uopt->volume = option;
 402                                 break;
 403                         case Opt_partition:
 404                                 if (match_int(args, &option))
 405                                         return 0;
 406                                 uopt->partition = option;
 407                                 break;
 408                         case Opt_fileset:
 409                                 if (match_int(args, &option))
 410                                         return 0;
 411                                 uopt->fileset = option;
 412                                 break;
 413                         case Opt_rootdir:
 414                                 if (match_int(args, &option))
 415                                         return 0;
 416                                 uopt->rootdir = option;
 417                                 break;
 418                         case Opt_utf8:
 419                                 uopt->flags |= (1 << UDF_FLAG_UTF8);
 420                                 break;
 421 #ifdef CONFIG_UDF_NLS
 422                         case Opt_iocharset:
 423                                 uopt->nls_map = load_nls(args[0].from);
 424                                 uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
 425                                 break;
 426 #endif
 427                         case Opt_uignore:
 428                                 uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
 429                                 break;
 430                         case Opt_uforget:
 431                                 uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
 432                                 break;
 433                         case Opt_gignore:
 434                             uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
 435                                 break;
 436                         case Opt_gforget:
 437                             uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
 438                                 break;
 439                         default:
 440                                 printk(KERN_ERR "udf: bad mount option \"%s\" "
 441                                                 "or missing value\n", p);
 442                         return 0;
 443                 }
 444         }
 445         return 1;
 446 }
 447
 448 void
 449 udf_write_super(struct super_block *sb)
 450 {
 451         lock_kernel();
 452         if (!(sb->s_flags & MS_RDONLY))
 453                 udf_open_lvid(sb);
 454         sb->s_dirt = 0;
 455         unlock_kernel();
 456 }
 457
 458 static int
 459 udf_remount_fs(struct super_block *sb, int *flags, char *options)
 460 {
 461         struct udf_options uopt;
 462
 463         uopt.flags = UDF_SB(sb)->s_flags ;
 464         uopt.uid   = UDF_SB(sb)->s_uid ;
 465         uopt.gid   = UDF_SB(sb)->s_gid ;
 466         uopt.umask = UDF_SB(sb)->s_umask ;
 467
 468         if ( !udf_parse_options(options, &uopt) )
 469                 return -EINVAL;
 470
 471         UDF_SB(sb)->s_flags = uopt.flags;
 472         UDF_SB(sb)->s_uid   = uopt.uid;
 473         UDF_SB(sb)->s_gid   = uopt.gid;
 474         UDF_SB(sb)->s_umask = uopt.umask;
 475
 476         if (UDF_SB_LVIDBH(sb)) {
 477                 int write_rev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev);
 478                 if (write_rev > UDF_MAX_WRITE_VERSION)
 479                         *flags |= MS_RDONLY;
 480         }
 481
 482         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 483                 return 0;
 484         if (*flags & MS_RDONLY)
 485                 udf_close_lvid(sb);
 486         else
 487                 udf_open_lvid(sb);
 488
 489         return 0;
 490 }
 491
 492 /*
 493  * udf_set_blocksize
 494  *
 495  * PURPOSE
 496  *      Set the block size to be used in all transfers.
 497  *
 498  * DESCRIPTION
 499  *      To allow room for a DMA transfer, it is best to guess big when unsure.
 500  *      This routine picks 2048 bytes as the blocksize when guessing. This
 501  *      should be adequate until devices with larger block sizes become common.
 502  *
 503  *      Note that the Linux kernel can currently only deal with blocksizes of
 504  *      512, 1024, 2048, 4096, and 8192 bytes.
 505  *
 506  * PRE-CONDITIONS
 507  *      sb                      Pointer to _locked_ superblock.
 508  *
 509  * POST-CONDITIONS
 510  *      sb->s_blocksize         Blocksize.
 511  *      sb->s_blocksize_bits    log2 of blocksize.
 512  *      <return>        0       Blocksize is valid.
 513  *      <return>        1       Blocksize is invalid.
 514  *
 515  * HISTORY
 516  *      July 1, 1997 - Andrew E. Mileski
 517  *      Written, tested, and released.
 518  */
 519 static  int
 520 udf_set_blocksize(struct super_block *sb, int bsize)
 521 {
 522         if (!sb_min_blocksize(sb, bsize)) {
 523                 udf_debug("Bad block size (%d)\n", bsize);
 524                 printk(KERN_ERR "udf: bad block size (%d)\n", bsize);
 525                 return 0;
 526         }
 527         return sb->s_blocksize;
 528 }
 529
 530 static int
 531 udf_vrs(struct super_block *sb, int silent)
 532 {
 533         struct volStructDesc *vsd = NULL;
 534         int sector = 32768;
 535         int sectorsize;
 536         struct buffer_head *bh = NULL;
 537         int iso9660=0;
 538         int nsr02=0;
 539         int nsr03=0;
 540
 541         /* Block size must be a multiple of 512 */
 542         if (sb->s_blocksize & 511)
 543                 return 0;
 544
 545         if (sb->s_blocksize < sizeof(struct volStructDesc))
 546                 sectorsize = sizeof(struct volStructDesc);
 547         else
 548                 sectorsize = sb->s_blocksize;
 549
 550         sector += (UDF_SB_SESSION(sb) << sb->s_blocksize_bits);
 551
 552         udf_debug("Starting at sector %u (%ld byte sectors)\n",
 553                 (sector >> sb->s_blocksize_bits), sb->s_blocksize);
 554         /* Process the sequence (if applicable) */
 555         for (;!nsr02 && !nsr03; sector += sectorsize)
 556         {
 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                 {
 568                         udf_release_data(bh);
 569                         break;
 570                 }
 571                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001, VSD_STD_ID_LEN))
 572                 {
 573                         iso9660 = sector;
 574                         switch (vsd->structType)
 575                         {
 576                                 case 0:
 577                                         udf_debug("ISO9660 Boot Record found\n");
 578                                         break;
 579                                 case 1:
 580                                         udf_debug("ISO9660 Primary Volume Descriptor found\n");
 581                                         break;
 582                                 case 2:
 583                                         udf_debug("ISO9660 Supplementary Volume Descriptor found\n");
 584                                         break;
 585                                 case 3:
 586                                         udf_debug("ISO9660 Volume Partition Descriptor found\n");
 587                                         break;
 588                                 case 255:
 589                                         udf_debug("ISO9660 Volume Descriptor Set Terminator found\n");
 590                                         break;
 591                                 default:
 592                                         udf_debug("ISO9660 VRS (%u) found\n", vsd->structType);
 593                                         break;
 594                         }
 595                 }
 596                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01, VSD_STD_ID_LEN))
 597                 {
 598                 }
 599                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01, VSD_STD_ID_LEN))
 600                 {
 601                         udf_release_data(bh);
 602                         break;
 603                 }
 604                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02, VSD_STD_ID_LEN))
 605                 {
 606                         nsr02 = sector;
 607                 }
 608                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03, VSD_STD_ID_LEN))
 609                 {
 610                         nsr03 = sector;
 611                 }
 612                 udf_release_data(bh);
 613         }
 614
 615         if (nsr03)
 616                 return nsr03;
 617         else if (nsr02)
 618                 return nsr02;
 619         else if (sector - (UDF_SB_SESSION(sb) << sb->s_blocksize_bits) == 32768)
 620                 return -1;
 621         else
 622                 return 0;
 623 }
 624
 625 /*
 626  * udf_find_anchor
 627  *
 628  * PURPOSE
 629  *      Find an anchor volume descriptor.
 630  *
 631  * PRE-CONDITIONS
 632  *      sb                      Pointer to _locked_ superblock.
 633  *      lastblock               Last block on media.
 634  *
 635  * POST-CONDITIONS
 636  *      <return>                1 if not found, 0 if ok
 637  *
 638  * HISTORY
 639  *      July 1, 1997 - Andrew E. Mileski
 640  *      Written, tested, and released.
 641  */
 642 static void
 643 udf_find_anchor(struct super_block *sb)
 644 {
 645         int lastblock = UDF_SB_LASTBLOCK(sb);
 646         struct buffer_head *bh = NULL;
 647         uint16_t ident;
 648         uint32_t location;
 649         int i;
 650
 651         if (lastblock)
 652         {
 653                 int varlastblock = udf_variable_to_fixed(lastblock);
 654                 int last[] =  { lastblock, lastblock - 2,
 655                                 lastblock - 150, lastblock - 152,
 656                                 varlastblock, varlastblock - 2,
 657                                 varlastblock - 150, varlastblock - 152 };
 658
 659                 lastblock = 0;
 660
 661                 /* Search for an anchor volume descriptor pointer */
 662
 663                 /*  according to spec, anchor is in either:
 664                  *     block 256
 665                  *     lastblock-256
 666                  *     lastblock
 667                  *  however, if the disc isn't closed, it could be 512 */
 668
 669                 for (i = 0; !lastblock && i < ARRAY_SIZE(last); i++) {
 670                         if (last[i] < 0 || !(bh = sb_bread(sb, last[i])))
 671                         {
 672                                 ident = location = 0;
 673                         }
 674                         else
 675                         {
 676                                 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
 677                                 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
 678                                 udf_release_data(bh);
 679                         }
 680
 681                         if (ident == TAG_IDENT_AVDP)
 682                         {
 683                                 if (location == last[i] - UDF_SB_SESSION(sb))
 684                                 {
 685                                         lastblock = UDF_SB_ANCHOR(sb)[0] = last[i] - UDF_SB_SESSION(sb);
 686                                         UDF_SB_ANCHOR(sb)[1] = last[i] - 256 - UDF_SB_SESSION(sb);
 687                                 }
 688                                 else if (location == udf_variable_to_fixed(last[i]) - UDF_SB_SESSION(sb))
 689                                 {
 690                                         UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
 691                                         lastblock = UDF_SB_ANCHOR(sb)[0] = udf_variable_to_fixed(last[i]) - UDF_SB_SESSION(sb);
 692                                         UDF_SB_ANCHOR(sb)[1] = lastblock - 256 - UDF_SB_SESSION(sb);
 693                                 }
 694                                 else
 695                                         udf_debug("Anchor found at block %d, location mismatch %d.\n",
 696                                                 last[i], location);
 697                         }
 698                         else if (ident == TAG_IDENT_FE || ident == TAG_IDENT_EFE)
 699                         {
 700                                 lastblock = last[i];
 701                                 UDF_SB_ANCHOR(sb)[3] = 512;
 702                         }
 703                         else
 704                         {
 705                                 if (last[i] < 256 || !(bh = sb_bread(sb, last[i] - 256)))
 706                                 {
 707                                         ident = location = 0;
 708                                 }
 709                                 else
 710                                 {
 711                                         ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
 712                                         location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
 713                                         udf_release_data(bh);
 714                                 }
 715
 716                                 if (ident == TAG_IDENT_AVDP &&
 717                                         location == last[i] - 256 - UDF_SB_SESSION(sb))
 718                                 {
 719                                         lastblock = last[i];
 720                                         UDF_SB_ANCHOR(sb)[1] = last[i] - 256;
 721                                 }
 722                                 else
 723                                 {
 724                                         if (last[i] < 312 + UDF_SB_SESSION(sb) || !(bh = sb_bread(sb, last[i] - 312 - UDF_SB_SESSION(sb))))
 725                                         {
 726                                                 ident = location = 0;
 727                                         }
 728                                         else
 729                                         {
 730                                                 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
 731                                                 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
 732                                                 udf_release_data(bh);
 733                                         }
 734
 735                                         if (ident == TAG_IDENT_AVDP &&
 736                                                 location == udf_variable_to_fixed(last[i]) - 256)
 737                                         {
 738                                                 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
 739                                                 lastblock = udf_variable_to_fixed(last[i]);
 740                                                 UDF_SB_ANCHOR(sb)[1] = lastblock - 256;
 741                                         }
 742                                 }
 743                         }
 744                 }
 745         }
 746
 747         if (!lastblock)
 748         {
 749                 /* We havn't found the lastblock. check 312 */
 750                 if ((bh = sb_bread(sb, 312 + UDF_SB_SESSION(sb))))
 751                 {
 752                         ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
 753                         location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
 754                         udf_release_data(bh);
 755
 756                         if (ident == TAG_IDENT_AVDP && location == 256)
 757                                 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
 758                 }
 759         }
 760
 761         for (i = 0; i < ARRAY_SIZE(UDF_SB_ANCHOR(sb)); i++) {
 762                 if (UDF_SB_ANCHOR(sb)[i])
 763                 {
 764                         if (!(bh = udf_read_tagged(sb,
 765                                 UDF_SB_ANCHOR(sb)[i], UDF_SB_ANCHOR(sb)[i], &ident)))
 766                         {
 767                                 UDF_SB_ANCHOR(sb)[i] = 0;
 768                         }
 769                         else
 770                         {
 771                                 udf_release_data(bh);
 772                                 if ((ident != TAG_IDENT_AVDP) && (i ||
 773                                         (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE)))
 774                                 {
 775                                         UDF_SB_ANCHOR(sb)[i] = 0;
 776                                 }
 777                         }
 778                 }
 779         }
 780
 781         UDF_SB_LASTBLOCK(sb) = lastblock;
 782 }
 783
 784 static int
 785 udf_find_fileset(struct super_block *sb, kernel_lb_addr *fileset, kernel_lb_addr *root)
 786 {
 787         struct buffer_head *bh = NULL;
 788         long lastblock;
 789         uint16_t ident;
 790
 791         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
 792                 fileset->partitionReferenceNum != 0xFFFF)
 793         {
 794                 bh = udf_read_ptagged(sb, *fileset, 0, &ident);
 795
 796                 if (!bh)
 797                         return 1;
 798                 else if (ident != TAG_IDENT_FSD)
 799                 {
 800                         udf_release_data(bh);
 801                         return 1;
 802                 }
 803
 804         }
 805
 806         if (!bh) /* Search backwards through the partitions */
 807         {
 808                 kernel_lb_addr newfileset;
 809
 810                 return 1;
 811
 812                 for (newfileset.partitionReferenceNum=UDF_SB_NUMPARTS(sb)-1;
 813                         (newfileset.partitionReferenceNum != 0xFFFF &&
 814                                 fileset->logicalBlockNum == 0xFFFFFFFF &&
 815                                 fileset->partitionReferenceNum == 0xFFFF);
 816                         newfileset.partitionReferenceNum--)
 817                 {
 818                         lastblock = UDF_SB_PARTLEN(sb, newfileset.partitionReferenceNum);
 819                         newfileset.logicalBlockNum = 0;
 820
 821                         do
 822                         {
 823                                 bh = udf_read_ptagged(sb, newfileset, 0, &ident);
 824                                 if (!bh)
 825                                 {
 826                                         newfileset.logicalBlockNum ++;
 827                                         continue;
 828                                 }
 829
 830                                 switch (ident)
 831                                 {
 832                                         case TAG_IDENT_SBD:
 833                                         {
 834                                                 struct spaceBitmapDesc *sp;
 835                                                 sp = (struct spaceBitmapDesc *)bh->b_data;
 836                                                 newfileset.logicalBlockNum += 1 +
 837                                                         ((le32_to_cpu(sp->numOfBytes) + sizeof(struct spaceBitmapDesc) - 1)
 838                                                                 >> sb->s_blocksize_bits);
 839                                                 udf_release_data(bh);
 840                                                 break;
 841                                         }
 842                                         case TAG_IDENT_FSD:
 843                                         {
 844                                                 *fileset = newfileset;
 845                                                 break;
 846                                         }
 847                                         default:
 848                                         {
 849                                                 newfileset.logicalBlockNum ++;
 850                                                 udf_release_data(bh);
 851                                                 bh = NULL;
 852                                                 break;
 853                                         }
 854                                 }
 855                         }
 856                         while (newfileset.logicalBlockNum < lastblock &&
 857                                 fileset->logicalBlockNum == 0xFFFFFFFF &&
 858                                 fileset->partitionReferenceNum == 0xFFFF);
 859                 }
 860         }
 861
 862         if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
 863                 fileset->partitionReferenceNum != 0xFFFF) && bh)
 864         {
 865                 udf_debug("Fileset at block=%d, partition=%d\n",
 866                         fileset->logicalBlockNum, fileset->partitionReferenceNum);
 867
 868                 UDF_SB_PARTITION(sb) = fileset->partitionReferenceNum;
 869                 udf_load_fileset(sb, bh, root);
 870                 udf_release_data(bh);
 871                 return 0;
 872         }
 873         return 1;
 874 }
 875
 876 static void
 877 udf_load_pvoldesc(struct super_block *sb, struct buffer_head *bh)
 878 {
 879         struct primaryVolDesc *pvoldesc;
 880         time_t recording;
 881         long recording_usec;
 882         struct ustr instr;
 883         struct ustr outstr;
 884
 885         pvoldesc = (struct primaryVolDesc *)bh->b_data;
 886
 887         if ( udf_stamp_to_time(&recording, &recording_usec,
 888                 lets_to_cpu(pvoldesc->recordingDateAndTime)) )
 889         {
 890                 kernel_timestamp ts;
 891                 ts = lets_to_cpu(pvoldesc->recordingDateAndTime);
 892                 udf_debug("recording time %ld/%ld, %04u/%02u/%02u %02u:%02u (%x)\n",
 893                         recording, recording_usec,
 894                         ts.year, ts.month, ts.day, ts.hour, ts.minute, ts.typeAndTimezone);
 895                 UDF_SB_RECORDTIME(sb).tv_sec = recording;
 896                 UDF_SB_RECORDTIME(sb).tv_nsec = recording_usec * 1000;
 897         }
 898
 899         if ( !udf_build_ustr(&instr, pvoldesc->volIdent, 32) )
 900         {
 901                 if (udf_CS0toUTF8(&outstr, &instr))
 902                 {
 903                         strncpy( UDF_SB_VOLIDENT(sb), outstr.u_name,
 904                                 outstr.u_len > 31 ? 31 : outstr.u_len);
 905                         udf_debug("volIdent[] = '%s'\n", UDF_SB_VOLIDENT(sb));
 906                 }
 907         }
 908
 909         if ( !udf_build_ustr(&instr, pvoldesc->volSetIdent, 128) )
 910         {
 911                 if (udf_CS0toUTF8(&outstr, &instr))
 912                         udf_debug("volSetIdent[] = '%s'\n", outstr.u_name);
 913         }
 914 }
 915
 916 static void
 917 udf_load_fileset(struct super_block *sb, struct buffer_head *bh, kernel_lb_addr *root)
 918 {
 919         struct fileSetDesc *fset;
 920
 921         fset = (struct fileSetDesc *)bh->b_data;
 922
 923         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
 924
 925         UDF_SB_SERIALNUM(sb) = le16_to_cpu(fset->descTag.tagSerialNum);
 926
 927         udf_debug("Rootdir at block=%d, partition=%d\n",
 928                 root->logicalBlockNum, root->partitionReferenceNum);
 929 }
 930
 931 static void
 932 udf_load_partdesc(struct super_block *sb, struct buffer_head *bh)
 933 {
 934         struct partitionDesc *p;
 935         int i;
 936
 937         p = (struct partitionDesc *)bh->b_data;
 938
 939         for (i=0; i<UDF_SB_NUMPARTS(sb); i++)
 940         {
 941                 udf_debug("Searching map: (%d == %d)\n",
 942                         UDF_SB_PARTMAPS(sb)[i].s_partition_num, le16_to_cpu(p->partitionNumber));
 943                 if (UDF_SB_PARTMAPS(sb)[i].s_partition_num == le16_to_cpu(p->partitionNumber))
 944                 {
 945                         UDF_SB_PARTLEN(sb,i) = le32_to_cpu(p->partitionLength); /* blocks */
 946                         UDF_SB_PARTROOT(sb,i) = le32_to_cpu(p->partitionStartingLocation);
 947                         if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_READ_ONLY)
 948                                 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_READ_ONLY;
 949                         if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_WRITE_ONCE)
 950                                 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_WRITE_ONCE;
 951                         if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_REWRITABLE)
 952                                 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_REWRITABLE;
 953                         if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_OVERWRITABLE)
 954                                 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_OVERWRITABLE;
 955
 956                         if (!strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) ||
 957                                 !strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
 958                         {
 959                                 struct partitionHeaderDesc *phd;
 960
 961                                 phd = (struct partitionHeaderDesc *)(p->partitionContentsUse);
 962                                 if (phd->unallocSpaceTable.extLength)
 963                                 {
 964                                         kernel_lb_addr loc = { le32_to_cpu(phd->unallocSpaceTable.extPosition), i };
 965
 966                                         UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table =
 967                                                 udf_iget(sb, loc);
 968                                         UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_UNALLOC_TABLE;
 969                                         udf_debug("unallocSpaceTable (part %d) @ %ld\n",
 970                                                 i, UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table->i_ino);
 971                                 }
 972                                 if (phd->unallocSpaceBitmap.extLength)
 973                                 {
 974                                         UDF_SB_ALLOC_BITMAP(sb, i, s_uspace);
 975                                         if (UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap != NULL)
 976                                         {
 977                                                 UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extLength =
 978                                                         le32_to_cpu(phd->unallocSpaceBitmap.extLength);
 979                                                 UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extPosition =
 980                                                         le32_to_cpu(phd->unallocSpaceBitmap.extPosition);
 981                                                 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_UNALLOC_BITMAP;
 982                                                 udf_debug("unallocSpaceBitmap (part %d) @ %d\n",
 983                                                         i, UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extPosition);
 984                                         }
 985                                 }
 986                                 if (phd->partitionIntegrityTable.extLength)
 987                                         udf_debug("partitionIntegrityTable (part %d)\n", i);
 988                                 if (phd->freedSpaceTable.extLength)
 989                                 {
 990                                         kernel_lb_addr loc = { le32_to_cpu(phd->freedSpaceTable.extPosition), i };
 991
 992                                         UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table =
 993                                                 udf_iget(sb, loc);
 994                                         UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_FREED_TABLE;
 995                                         udf_debug("freedSpaceTable (part %d) @ %ld\n",
 996                                                 i, UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table->i_ino);
 997                                 }
 998                                 if (phd->freedSpaceBitmap.extLength)
 999                                 {
1000                                         UDF_SB_ALLOC_BITMAP(sb, i, s_fspace);
1001                                         if (UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap != NULL)
1002                                         {
1003                                                 UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extLength =
1004                                                         le32_to_cpu(phd->freedSpaceBitmap.extLength);
1005                                                 UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extPosition =
1006                                                         le32_to_cpu(phd->freedSpaceBitmap.extPosition);
1007                                                 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_FREED_BITMAP;
1008                                                 udf_debug("freedSpaceBitmap (part %d) @ %d\n",
1009                                                         i, UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extPosition);
1010                                         }
1011                                 }
1012                         }
1013                         break;
1014                 }
1015         }
1016         if (i == UDF_SB_NUMPARTS(sb))
1017         {
1018                 udf_debug("Partition (%d) not found in partition map\n", le16_to_cpu(p->partitionNumber));
1019         }
1020         else
1021         {
1022                 udf_debug("Partition (%d:%d type %x) starts at physical %d, block length %d\n",
1023                         le16_to_cpu(p->partitionNumber), i, UDF_SB_PARTTYPE(sb,i),
1024                         UDF_SB_PARTROOT(sb,i), UDF_SB_PARTLEN(sb,i));
1025         }
1026 }
1027
1028 static int
1029 udf_load_logicalvol(struct super_block *sb, struct buffer_head * bh, kernel_lb_addr *fileset)
1030 {
1031         struct logicalVolDesc *lvd;
1032         int i, j, offset;
1033         uint8_t type;
1034
1035         lvd = (struct logicalVolDesc *)bh->b_data;
1036
1037         UDF_SB_ALLOC_PARTMAPS(sb, le32_to_cpu(lvd->numPartitionMaps));
1038
1039         for (i=0,offset=0;
1040                  i<UDF_SB_NUMPARTS(sb) && offset<le32_to_cpu(lvd->mapTableLength);
1041                  i++,offset+=((struct genericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapLength)
1042         {
1043                 type = ((struct genericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapType;
1044                 if (type == 1)
1045                 {
1046                         struct genericPartitionMap1 *gpm1 = (struct genericPartitionMap1 *)&(lvd->partitionMaps[offset]);
1047                         UDF_SB_PARTTYPE(sb,i) = UDF_TYPE1_MAP15;
1048                         UDF_SB_PARTVSN(sb,i) = le16_to_cpu(gpm1->volSeqNum);
1049                         UDF_SB_PARTNUM(sb,i) = le16_to_cpu(gpm1->partitionNum);
1050                         UDF_SB_PARTFUNC(sb,i) = NULL;
1051                 }
1052                 else if (type == 2)
1053                 {
1054                         struct udfPartitionMap2 *upm2 = (struct udfPartitionMap2 *)&(lvd->partitionMaps[offset]);
1055                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL, strlen(UDF_ID_VIRTUAL)))
1056                         {
1057                                 if (le16_to_cpu(((__le16 *)upm2->partIdent.identSuffix)[0]) == 0x0150)
1058                                 {
1059                                         UDF_SB_PARTTYPE(sb,i) = UDF_VIRTUAL_MAP15;
1060                                         UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_virt15;
1061                                 }
1062                                 else if (le16_to_cpu(((__le16 *)upm2->partIdent.identSuffix)[0]) == 0x0200)
1063                                 {
1064                                         UDF_SB_PARTTYPE(sb,i) = UDF_VIRTUAL_MAP20;
1065                                         UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_virt20;
1066                                 }
1067                         }
1068                         else if (!strncmp(upm2->partIdent.ident, UDF_ID_SPARABLE, strlen(UDF_ID_SPARABLE)))
1069                         {
1070                                 uint32_t loc;
1071                                 uint16_t ident;
1072                                 struct sparingTable *st;
1073                                 struct sparablePartitionMap *spm = (struct sparablePartitionMap *)&(lvd->partitionMaps[offset]);
1074
1075                                 UDF_SB_PARTTYPE(sb,i) = UDF_SPARABLE_MAP15;
1076                                 UDF_SB_TYPESPAR(sb,i).s_packet_len = le16_to_cpu(spm->packetLength);
1077                                 for (j=0; j<spm->numSparingTables; j++)
1078                                 {
1079                                         loc = le32_to_cpu(spm->locSparingTable[j]);
1080                                         UDF_SB_TYPESPAR(sb,i).s_spar_map[j] =
1081                                                 udf_read_tagged(sb, loc, loc, &ident);
1082                                         if (UDF_SB_TYPESPAR(sb,i).s_spar_map[j] != NULL)
1083                                         {
1084                                                 st = (struct sparingTable *)UDF_SB_TYPESPAR(sb,i).s_spar_map[j]->b_data;
1085                                                 if (ident != 0 ||
1086                                                         strncmp(st->sparingIdent.ident, UDF_ID_SPARING, strlen(UDF_ID_SPARING)))
1087                                                 {
1088                                                         udf_release_data(UDF_SB_TYPESPAR(sb,i).s_spar_map[j]);
1089                                                         UDF_SB_TYPESPAR(sb,i).s_spar_map[j] = NULL;
1090                                                 }
1091                                         }
1092                                 }
1093                                 UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_spar15;
1094                         }
1095                         else
1096                         {
1097                                 udf_debug("Unknown ident: %s\n", upm2->partIdent.ident);
1098                                 continue;
1099                         }
1100                         UDF_SB_PARTVSN(sb,i) = le16_to_cpu(upm2->volSeqNum);
1101                         UDF_SB_PARTNUM(sb,i) = le16_to_cpu(upm2->partitionNum);
1102                 }
1103                 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1104                         i, UDF_SB_PARTNUM(sb,i), type, UDF_SB_PARTVSN(sb,i));
1105         }
1106
1107         if (fileset)
1108         {
1109                 long_ad *la = (long_ad *)&(lvd->logicalVolContentsUse[0]);
1110
1111                 *fileset = lelb_to_cpu(la->extLocation);
1112                 udf_debug("FileSet found in LogicalVolDesc at block=%d, partition=%d\n",
1113                         fileset->logicalBlockNum,
1114                         fileset->partitionReferenceNum);
1115         }
1116         if (lvd->integritySeqExt.extLength)
1117                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1118         return 0;
1119 }
1120
1121 /*
1122  * udf_load_logicalvolint
1123  *
1124  */
1125 static void
1126 udf_load_logicalvolint(struct super_block *sb, kernel_extent_ad loc)
1127 {
1128         struct buffer_head *bh = NULL;
1129         uint16_t ident;
1130
1131         while (loc.extLength > 0 &&
1132                 (bh = udf_read_tagged(sb, loc.extLocation,
1133                         loc.extLocation, &ident)) &&
1134                 ident == TAG_IDENT_LVID)
1135         {
1136                 UDF_SB_LVIDBH(sb) = bh;
1137
1138                 if (UDF_SB_LVID(sb)->nextIntegrityExt.extLength)
1139                         udf_load_logicalvolint(sb, leea_to_cpu(UDF_SB_LVID(sb)->nextIntegrityExt));
1140
1141                 if (UDF_SB_LVIDBH(sb) != bh)
1142                         udf_release_data(bh);
1143                 loc.extLength -= sb->s_blocksize;
1144                 loc.extLocation ++;
1145         }
1146         if (UDF_SB_LVIDBH(sb) != bh)
1147                 udf_release_data(bh);
1148 }
1149
1150 /*
1151  * udf_process_sequence
1152  *
1153  * PURPOSE
1154  *      Process a main/reserve volume descriptor sequence.
1155  *
1156  * PRE-CONDITIONS
1157  *      sb                      Pointer to _locked_ superblock.
1158  *      block                   First block of first extent of the sequence.
1159  *      lastblock               Lastblock of first extent of the sequence.
1160  *
1161  * HISTORY
1162  *      July 1, 1997 - Andrew E. Mileski
1163  *      Written, tested, and released.
1164  */
1165 static  int
1166 udf_process_sequence(struct super_block *sb, long block, long lastblock, kernel_lb_addr *fileset)
1167 {
1168         struct buffer_head *bh = NULL;
1169         struct udf_vds_record vds[VDS_POS_LENGTH];
1170         struct generic_desc *gd;
1171         struct volDescPtr *vdp;
1172         int done=0;
1173         int i,j;
1174         uint32_t vdsn;
1175         uint16_t ident;
1176         long next_s = 0, next_e = 0;
1177
1178         memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1179
1180         /* Read the main descriptor sequence */
1181         for (;(!done && block <= lastblock); block++)
1182         {
1183
1184                 bh = udf_read_tagged(sb, block, block, &ident);
1185                 if (!bh)
1186                         break;
1187
1188                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1189                 gd = (struct generic_desc *)bh->b_data;
1190                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1191                 switch (ident)
1192                 {
1193                         case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1194                                 if (vdsn >= vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum)
1195                                 {
1196                                         vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum = vdsn;
1197                                         vds[VDS_POS_PRIMARY_VOL_DESC].block = block;
1198                                 }
1199                                 break;
1200                         case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1201                                 if (vdsn >= vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum)
1202                                 {
1203                                         vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum = vdsn;
1204                                         vds[VDS_POS_VOL_DESC_PTR].block = block;
1205
1206                                         vdp = (struct volDescPtr *)bh->b_data;
1207                                         next_s = le32_to_cpu(vdp->nextVolDescSeqExt.extLocation);
1208                                         next_e = le32_to_cpu(vdp->nextVolDescSeqExt.extLength);
1209                                         next_e = next_e >> sb->s_blocksize_bits;
1210                                         next_e += next_s;
1211                                 }
1212                                 break;
1213                         case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1214                                 if (vdsn >= vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum)
1215                                 {
1216                                         vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum = vdsn;
1217                                         vds[VDS_POS_IMP_USE_VOL_DESC].block = block;
1218                                 }
1219                                 break;
1220                         case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1221                                 if (!vds[VDS_POS_PARTITION_DESC].block)
1222                                         vds[VDS_POS_PARTITION_DESC].block = block;
1223                                 break;
1224                         case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1225                                 if (vdsn >= vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum)
1226                                 {
1227                                         vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum = vdsn;
1228                                         vds[VDS_POS_LOGICAL_VOL_DESC].block = block;
1229                                 }
1230                                 break;
1231                         case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1232                                 if (vdsn >= vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum)
1233                                 {
1234                                         vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum = vdsn;
1235                                         vds[VDS_POS_UNALLOC_SPACE_DESC].block = block;
1236                                 }
1237                                 break;
1238                         case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1239                                 vds[VDS_POS_TERMINATING_DESC].block = block;
1240                                 if (next_e)
1241                                 {
1242                                         block = next_s;
1243                                         lastblock = next_e;
1244                                         next_s = next_e = 0;
1245                                 }
1246                                 else
1247                                         done = 1;
1248                                 break;
1249                 }
1250                 udf_release_data(bh);
1251         }
1252         for (i=0; i<VDS_POS_LENGTH; i++)
1253         {
1254                 if (vds[i].block)
1255                 {
1256                         bh = udf_read_tagged(sb, vds[i].block, vds[i].block, &ident);
1257
1258                         if (i == VDS_POS_PRIMARY_VOL_DESC)
1259                                 udf_load_pvoldesc(sb, bh);
1260                         else if (i == VDS_POS_LOGICAL_VOL_DESC)
1261                                 udf_load_logicalvol(sb, bh, fileset);
1262                         else if (i == VDS_POS_PARTITION_DESC)
1263                         {
1264                                 struct buffer_head *bh2 = NULL;
1265                                 udf_load_partdesc(sb, bh);
1266                                 for (j=vds[i].block+1; j<vds[VDS_POS_TERMINATING_DESC].block; j++)
1267                                 {
1268                                         bh2 = udf_read_tagged(sb, j, j, &ident);
1269                                         gd = (struct generic_desc *)bh2->b_data;
1270                                         if (ident == TAG_IDENT_PD)
1271                                                 udf_load_partdesc(sb, bh2);
1272                                         udf_release_data(bh2);
1273                                 }
1274                         }
1275                         udf_release_data(bh);
1276                 }
1277         }
1278
1279         return 0;
1280 }
1281
1282 /*
1283  * udf_check_valid()
1284  */
1285 static int
1286 udf_check_valid(struct super_block *sb, int novrs, int silent)
1287 {
1288         long block;
1289
1290         if (novrs)
1291         {
1292                 udf_debug("Validity check skipped because of novrs option\n");
1293                 return 0;
1294         }
1295         /* Check that it is NSR02 compliant */
1296         /* Process any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
1297         else if ((block = udf_vrs(sb, silent)) == -1)
1298         {
1299                 udf_debug("Failed to read byte 32768. Assuming open disc. Skipping validity check\n");
1300                 if (!UDF_SB_LASTBLOCK(sb))
1301                         UDF_SB_LASTBLOCK(sb) = udf_get_last_block(sb);
1302                 return 0;
1303         }
1304         else
1305                 return !block;
1306 }
1307
1308 static int
1309 udf_load_partition(struct super_block *sb, kernel_lb_addr *fileset)
1310 {
1311         struct anchorVolDescPtr *anchor;
1312         uint16_t ident;
1313         struct buffer_head *bh;
1314         long main_s, main_e, reserve_s, reserve_e;
1315         int i, j;
1316
1317         if (!sb)
1318                 return 1;
1319
1320         for (i = 0; i < ARRAY_SIZE(UDF_SB_ANCHOR(sb)); i++) {
1321                 if (UDF_SB_ANCHOR(sb)[i] && (bh = udf_read_tagged(sb,
1322                         UDF_SB_ANCHOR(sb)[i], UDF_SB_ANCHOR(sb)[i], &ident)))
1323                 {
1324                         anchor = (struct anchorVolDescPtr *)bh->b_data;
1325
1326                         /* Locate the main sequence */
1327                         main_s = le32_to_cpu( anchor->mainVolDescSeqExt.extLocation );
1328                         main_e = le32_to_cpu( anchor->mainVolDescSeqExt.extLength );
1329                         main_e = main_e >> sb->s_blocksize_bits;
1330                         main_e += main_s;
1331
1332                         /* Locate the reserve sequence */
1333                         reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1334                         reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1335                         reserve_e = reserve_e >> sb->s_blocksize_bits;
1336                         reserve_e += reserve_s;
1337
1338                         udf_release_data(bh);
1339
1340                         /* Process the main & reserve sequences */
1341                         /* responsible for finding the PartitionDesc(s) */
1342                         if (!(udf_process_sequence(sb, main_s, main_e, fileset) &&
1343                                 udf_process_sequence(sb, reserve_s, reserve_e, fileset)))
1344                         {
1345                                 break;
1346                         }
1347                 }
1348         }
1349
1350         if (i == ARRAY_SIZE(UDF_SB_ANCHOR(sb))) {
1351                 udf_debug("No Anchor block found\n");
1352                 return 1;
1353         } else
1354                 udf_debug("Using anchor in block %d\n", UDF_SB_ANCHOR(sb)[i]);
1355
1356         for (i=0; i<UDF_SB_NUMPARTS(sb); i++)
1357         {
1358                 switch UDF_SB_PARTTYPE(sb, i)
1359                 {
1360                         case UDF_VIRTUAL_MAP15:
1361                         case UDF_VIRTUAL_MAP20:
1362                         {
1363                                 kernel_lb_addr ino;
1364
1365                                 if (!UDF_SB_LASTBLOCK(sb))
1366                                 {
1367                                         UDF_SB_LASTBLOCK(sb) = udf_get_last_block(sb);
1368                                         udf_find_anchor(sb);
1369                                 }
1370
1371                                 if (!UDF_SB_LASTBLOCK(sb))
1372                                 {
1373                                         udf_debug("Unable to determine Lastblock (For Virtual Partition)\n");
1374                                         return 1;
1375                                 }
1376
1377                                 for (j=0; j<UDF_SB_NUMPARTS(sb); j++)
1378                                 {
1379                                         if (j != i &&
1380                                                 UDF_SB_PARTVSN(sb,i) == UDF_SB_PARTVSN(sb,j) &&
1381                                                 UDF_SB_PARTNUM(sb,i) == UDF_SB_PARTNUM(sb,j))
1382                                         {
1383                                                 ino.partitionReferenceNum = j;
1384                                                 ino.logicalBlockNum = UDF_SB_LASTBLOCK(sb) -
1385                                                         UDF_SB_PARTROOT(sb,j);
1386                                                 break;
1387                                         }
1388                                 }
1389
1390                                 if (j == UDF_SB_NUMPARTS(sb))
1391                                         return 1;
1392
1393                                 if (!(UDF_SB_VAT(sb) = udf_iget(sb, ino)))
1394                                         return 1;
1395
1396                                 if (UDF_SB_PARTTYPE(sb,i) == UDF_VIRTUAL_MAP15)
1397                                 {
1398                                         UDF_SB_TYPEVIRT(sb,i).s_start_offset = udf_ext0_offset(UDF_SB_VAT(sb));
1399                                         UDF_SB_TYPEVIRT(sb,i).s_num_entries = (UDF_SB_VAT(sb)->i_size - 36) >> 2;
1400                                 }
1401                                 else if (UDF_SB_PARTTYPE(sb,i) == UDF_VIRTUAL_MAP20)
1402                                 {
1403                                         struct buffer_head *bh = NULL;
1404                                         uint32_t pos;
1405
1406                                         pos = udf_block_map(UDF_SB_VAT(sb), 0);
1407                                         bh = sb_bread(sb, pos);
1408                                         UDF_SB_TYPEVIRT(sb,i).s_start_offset =
1409                                                 le16_to_cpu(((struct virtualAllocationTable20 *)bh->b_data + udf_ext0_offset(UDF_SB_VAT(sb)))->lengthHeader) +
1410                                                         udf_ext0_offset(UDF_SB_VAT(sb));
1411                                         UDF_SB_TYPEVIRT(sb,i).s_num_entries = (UDF_SB_VAT(sb)->i_size -
1412                                                 UDF_SB_TYPEVIRT(sb,i).s_start_offset) >> 2;
1413                                         udf_release_data(bh);
1414                                 }
1415                                 UDF_SB_PARTROOT(sb,i) = udf_get_pblock(sb, 0, i, 0);
1416                                 UDF_SB_PARTLEN(sb,i) = UDF_SB_PARTLEN(sb,ino.partitionReferenceNum);
1417                         }
1418                 }
1419         }
1420         return 0;
1421 }
1422
1423 static void udf_open_lvid(struct super_block *sb)
1424 {
1425         if (UDF_SB_LVIDBH(sb))
1426         {
1427                 int i;
1428                 kernel_timestamp cpu_time;
1429
1430                 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1431                 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1432                 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
1433                         UDF_SB_LVID(sb)->recordingDateAndTime = cpu_to_lets(cpu_time);
1434                 UDF_SB_LVID(sb)->integrityType = LVID_INTEGRITY_TYPE_OPEN;
1435
1436                 UDF_SB_LVID(sb)->descTag.descCRC =
1437                         cpu_to_le16(udf_crc((char *)UDF_SB_LVID(sb) + sizeof(tag),
1438                         le16_to_cpu(UDF_SB_LVID(sb)->descTag.descCRCLength), 0));
1439
1440                 UDF_SB_LVID(sb)->descTag.tagChecksum = 0;
1441                 for (i=0; i<16; i++)
1442                         if (i != 4)
1443                                 UDF_SB_LVID(sb)->descTag.tagChecksum +=
1444                                         ((uint8_t *)&(UDF_SB_LVID(sb)->descTag))[i];
1445
1446                 mark_buffer_dirty(UDF_SB_LVIDBH(sb));
1447         }
1448 }
1449
1450 static void udf_close_lvid(struct super_block *sb)
1451 {
1452         if (UDF_SB_LVIDBH(sb) &&
1453                 UDF_SB_LVID(sb)->integrityType == LVID_INTEGRITY_TYPE_OPEN)
1454         {
1455                 int i;
1456                 kernel_timestamp cpu_time;
1457
1458                 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1459                 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1460                 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
1461                         UDF_SB_LVID(sb)->recordingDateAndTime = cpu_to_lets(cpu_time);
1462                 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(UDF_SB_LVIDIU(sb)->maxUDFWriteRev))
1463                         UDF_SB_LVIDIU(sb)->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1464                 if (UDF_SB_UDFREV(sb) > le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev))
1465                         UDF_SB_LVIDIU(sb)->minUDFReadRev = cpu_to_le16(UDF_SB_UDFREV(sb));
1466                 if (UDF_SB_UDFREV(sb) > le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev))
1467                         UDF_SB_LVIDIU(sb)->minUDFWriteRev = cpu_to_le16(UDF_SB_UDFREV(sb));
1468                 UDF_SB_LVID(sb)->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1469
1470                 UDF_SB_LVID(sb)->descTag.descCRC =
1471                         cpu_to_le16(udf_crc((char *)UDF_SB_LVID(sb) + sizeof(tag),
1472                         le16_to_cpu(UDF_SB_LVID(sb)->descTag.descCRCLength), 0));
1473
1474                 UDF_SB_LVID(sb)->descTag.tagChecksum = 0;
1475                 for (i=0; i<16; i++)
1476                         if (i != 4)
1477                                 UDF_SB_LVID(sb)->descTag.tagChecksum +=
1478                                         ((uint8_t *)&(UDF_SB_LVID(sb)->descTag))[i];
1479
1480                 mark_buffer_dirty(UDF_SB_LVIDBH(sb));
1481         }
1482 }
1483
1484 /*
1485  * udf_read_super
1486  *
1487  * PURPOSE
1488  *      Complete the specified super block.
1489  *
1490  * PRE-CONDITIONS
1491  *      sb                      Pointer to superblock to complete - never NULL.
1492  *      sb->s_dev               Device to read suberblock from.
1493  *      options                 Pointer to mount options.
1494  *      silent                  Silent flag.
1495  *
1496  * HISTORY
1497  *      July 1, 1997 - Andrew E. Mileski
1498  *      Written, tested, and released.
1499  */
1500 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1501 {
1502         int i;
1503         struct inode *inode=NULL;
1504         struct udf_options uopt;
1505         kernel_lb_addr rootdir, fileset;
1506         struct udf_sb_info *sbi;
1507
1508         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1509         uopt.uid = -1;
1510         uopt.gid = -1;
1511         uopt.umask = 0;
1512
1513         sbi = kmalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1514         if (!sbi)
1515                 return -ENOMEM;
1516         sb->s_fs_info = sbi;
1517         memset(UDF_SB(sb), 0x00, sizeof(struct udf_sb_info));
1518
1519         mutex_init(&sbi->s_alloc_mutex);
1520
1521         if (!udf_parse_options((char *)options, &uopt))
1522                 goto error_out;
1523
1524         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1525             uopt.flags & (1 << UDF_FLAG_NLS_MAP))
1526         {
1527                 udf_error(sb, "udf_read_super",
1528                         "utf8 cannot be combined with iocharset\n");
1529                 goto error_out;
1530         }
1531 #ifdef CONFIG_UDF_NLS
1532         if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map)
1533         {
1534                 uopt.nls_map = load_nls_default();
1535                 if (!uopt.nls_map)
1536                         uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1537                 else
1538                         udf_debug("Using default NLS map\n");
1539         }
1540 #endif
1541         if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1542                 uopt.flags |= (1 << UDF_FLAG_UTF8);
1543
1544         fileset.logicalBlockNum = 0xFFFFFFFF;
1545         fileset.partitionReferenceNum = 0xFFFF;
1546
1547         UDF_SB(sb)->s_flags = uopt.flags;
1548         UDF_SB(sb)->s_uid = uopt.uid;
1549         UDF_SB(sb)->s_gid = uopt.gid;
1550         UDF_SB(sb)->s_umask = uopt.umask;
1551         UDF_SB(sb)->s_nls_map = uopt.nls_map;
1552
1553         /* Set the block size for all transfers */
1554         if (!udf_set_blocksize(sb, uopt.blocksize))
1555                 goto error_out;
1556
1557         if ( uopt.session == 0xFFFFFFFF )
1558                 UDF_SB_SESSION(sb) = udf_get_last_session(sb);
1559         else
1560                 UDF_SB_SESSION(sb) = uopt.session;
1561
1562         udf_debug("Multi-session=%d\n", UDF_SB_SESSION(sb));
1563
1564         UDF_SB_LASTBLOCK(sb) = uopt.lastblock;
1565         UDF_SB_ANCHOR(sb)[0] = UDF_SB_ANCHOR(sb)[1] = 0;
1566         UDF_SB_ANCHOR(sb)[2] = uopt.anchor;
1567         UDF_SB_ANCHOR(sb)[3] = 256;
1568
1569         if (udf_check_valid(sb, uopt.novrs, silent)) /* read volume recognition sequences */
1570         {
1571                 printk("UDF-fs: No VRS found\n");
1572                 goto error_out;
1573         }
1574
1575         udf_find_anchor(sb);
1576
1577         /* Fill in the rest of the superblock */
1578         sb->s_op = &udf_sb_ops;
1579         sb->dq_op = NULL;
1580         sb->s_dirt = 0;
1581         sb->s_magic = UDF_SUPER_MAGIC;
1582         sb->s_time_gran = 1000;
1583
1584         if (udf_load_partition(sb, &fileset))
1585         {
1586                 printk("UDF-fs: No partition found (1)\n");
1587                 goto error_out;
1588         }
1589
1590         udf_debug("Lastblock=%d\n", UDF_SB_LASTBLOCK(sb));
1591
1592         if ( UDF_SB_LVIDBH(sb) )
1593         {
1594                 uint16_t minUDFReadRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev);
1595                 uint16_t minUDFWriteRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev);
1596                 /* uint16_t maxUDFWriteRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->maxUDFWriteRev); */
1597
1598                 if (minUDFReadRev > UDF_MAX_READ_VERSION)
1599                 {
1600                         printk("UDF-fs: minUDFReadRev=%x (max is %x)\n",
1601                                 le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev),
1602                                 UDF_MAX_READ_VERSION);
1603                         goto error_out;
1604                 }
1605                 else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
1606                 {
1607                         sb->s_flags |= MS_RDONLY;
1608                 }
1609
1610                 UDF_SB_UDFREV(sb) = minUDFWriteRev;
1611
1612                 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1613                         UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
1614                 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
1615                         UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
1616         }
1617
1618         if ( !UDF_SB_NUMPARTS(sb) )
1619         {
1620                 printk("UDF-fs: No partition found (2)\n");
1621                 goto error_out;
1622         }
1623
1624         if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_READ_ONLY) {
1625                 printk("UDF-fs: Partition marked readonly; forcing readonly mount\n");
1626                 sb->s_flags |= MS_RDONLY;
1627         }
1628
1629         if ( udf_find_fileset(sb, &fileset, &rootdir) )
1630         {
1631                 printk("UDF-fs: No fileset found\n");
1632                 goto error_out;
1633         }
1634
1635         if (!silent)
1636         {
1637                 kernel_timestamp ts;
1638                 udf_time_to_stamp(&ts, UDF_SB_RECORDTIME(sb));
1639                 udf_info("UDF %s (%s) Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
1640                         UDFFS_VERSION, UDFFS_DATE,
1641                         UDF_SB_VOLIDENT(sb), ts.year, ts.month, ts.day, ts.hour, ts.minute,
1642                         ts.typeAndTimezone);
1643         }
1644         if (!(sb->s_flags & MS_RDONLY))
1645                 udf_open_lvid(sb);
1646
1647         /* Assign the root inode */
1648         /* assign inodes by physical block number */
1649         /* perhaps it's not extensible enough, but for now ... */
1650         inode = udf_iget(sb, rootdir);
1651         if (!inode)
1652         {
1653                 printk("UDF-fs: Error in udf_iget, block=%d, partition=%d\n",
1654                         rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
1655                 goto error_out;
1656         }
1657
1658         /* Allocate a dentry for the root inode */
1659         sb->s_root = d_alloc_root(inode);
1660         if (!sb->s_root)
1661         {
1662                 printk("UDF-fs: Couldn't allocate root dentry\n");
1663                 iput(inode);
1664                 goto error_out;
1665         }
1666         sb->s_maxbytes = 1<<30;
1667         return 0;
1668
1669 error_out:
1670         if (UDF_SB_VAT(sb))
1671                 iput(UDF_SB_VAT(sb));
1672         if (UDF_SB_NUMPARTS(sb))
1673         {
1674                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1675                         iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1676                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1677                         iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1678                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1679                         UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_uspace);
1680                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1681                         UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_fspace);
1682                 if (UDF_SB_PARTTYPE(sb, UDF_SB_PARTITION(sb)) == UDF_SPARABLE_MAP15)
1683                 {
1684                         for (i=0; i<4; i++)
1685                                 udf_release_data(UDF_SB_TYPESPAR(sb, UDF_SB_PARTITION(sb)).s_spar_map[i]);
1686                 }
1687         }
1688 #ifdef CONFIG_UDF_NLS
1689         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1690                 unload_nls(UDF_SB(sb)->s_nls_map);
1691 #endif
1692         if (!(sb->s_flags & MS_RDONLY))
1693                 udf_close_lvid(sb);
1694         udf_release_data(UDF_SB_LVIDBH(sb));
1695         UDF_SB_FREE(sb);
1696         kfree(sbi);
1697         sb->s_fs_info = NULL;
1698         return -EINVAL;
1699 }
1700
1701 void udf_error(struct super_block *sb, const char *function,
1702         const char *fmt, ...)
1703 {
1704         va_list args;
1705
1706         if (!(sb->s_flags & MS_RDONLY))
1707         {
1708                 /* mark sb error */
1709                 sb->s_dirt = 1;
1710         }
1711         va_start(args, fmt);
1712         vsprintf(error_buf, fmt, args);
1713         va_end(args);
1714         printk (KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
1715                 sb->s_id, function, error_buf);
1716 }
1717
1718 void udf_warning(struct super_block *sb, const char *function,
1719         const char *fmt, ...)
1720 {
1721         va_list args;
1722
1723         va_start (args, fmt);
1724         vsprintf(error_buf, fmt, args);
1725         va_end(args);
1726         printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
1727                 sb->s_id, function, error_buf);
1728 }
1729
1730 /*
1731  * udf_put_super
1732  *
1733  * PURPOSE
1734  *      Prepare for destruction of the superblock.
1735  *
1736  * DESCRIPTION
1737  *      Called before the filesystem is unmounted.
1738  *
1739  * HISTORY
1740  *      July 1, 1997 - Andrew E. Mileski
1741  *      Written, tested, and released.
1742  */
1743 static void
1744 udf_put_super(struct super_block *sb)
1745 {
1746         int i;
1747
1748         if (UDF_SB_VAT(sb))
1749                 iput(UDF_SB_VAT(sb));
1750         if (UDF_SB_NUMPARTS(sb))
1751         {
1752                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1753                         iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1754                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1755                         iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1756                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1757                         UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_uspace);
1758                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1759                         UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_fspace);
1760                 if (UDF_SB_PARTTYPE(sb, UDF_SB_PARTITION(sb)) == UDF_SPARABLE_MAP15)
1761                 {
1762                         for (i=0; i<4; i++)
1763                                 udf_release_data(UDF_SB_TYPESPAR(sb, UDF_SB_PARTITION(sb)).s_spar_map[i]);
1764                 }
1765         }
1766 #ifdef CONFIG_UDF_NLS
1767         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1768                 unload_nls(UDF_SB(sb)->s_nls_map);
1769 #endif
1770         if (!(sb->s_flags & MS_RDONLY))
1771                 udf_close_lvid(sb);
1772         udf_release_data(UDF_SB_LVIDBH(sb));
1773         UDF_SB_FREE(sb);
1774         kfree(sb->s_fs_info);
1775         sb->s_fs_info = NULL;
1776 }
1777
1778 /*
1779  * udf_stat_fs
1780  *
1781  * PURPOSE
1782  *      Return info about the filesystem.
1783  *
1784  * DESCRIPTION
1785  *      Called by sys_statfs()
1786  *
1787  * HISTORY
1788  *      July 1, 1997 - Andrew E. Mileski
1789  *      Written, tested, and released.
1790  */
1791 static int
1792 udf_statfs(struct dentry *dentry, struct kstatfs *buf)
1793 {
1794         struct super_block *sb = dentry->d_sb;
1795
1796         buf->f_type = UDF_SUPER_MAGIC;
1797         buf->f_bsize = sb->s_blocksize;
1798         buf->f_blocks = UDF_SB_PARTLEN(sb, UDF_SB_PARTITION(sb));
1799         buf->f_bfree = udf_count_free(sb);
1800         buf->f_bavail = buf->f_bfree;
1801         buf->f_files = (UDF_SB_LVIDBH(sb) ?
1802                 (le32_to_cpu(UDF_SB_LVIDIU(sb)->numFiles) +
1803                 le32_to_cpu(UDF_SB_LVIDIU(sb)->numDirs)) : 0) + buf->f_bfree;
1804         buf->f_ffree = buf->f_bfree;
1805         /* __kernel_fsid_t f_fsid */
1806         buf->f_namelen = UDF_NAME_LEN-2;
1807
1808         return 0;
1809 }
1810
1811 static unsigned char udf_bitmap_lookup[16] = {
1812         0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4
1813 };
1814
1815 static unsigned int
1816 udf_count_free_bitmap(struct super_block *sb, struct udf_bitmap *bitmap)
1817 {
1818         struct buffer_head *bh = NULL;
1819         unsigned int accum = 0;
1820         int index;
1821         int block = 0, newblock;
1822         kernel_lb_addr loc;
1823         uint32_t bytes;
1824         uint8_t value;
1825         uint8_t *ptr;
1826         uint16_t ident;
1827         struct spaceBitmapDesc *bm;
1828
1829         lock_kernel();
1830
1831         loc.logicalBlockNum = bitmap->s_extPosition;
1832         loc.partitionReferenceNum = UDF_SB_PARTITION(sb);
1833         bh = udf_read_ptagged(sb, loc, 0, &ident);
1834
1835         if (!bh)
1836         {
1837                 printk(KERN_ERR "udf: udf_count_free failed\n");
1838                 goto out;
1839         }
1840         else if (ident != TAG_IDENT_SBD)
1841         {
1842                 udf_release_data(bh);
1843                 printk(KERN_ERR "udf: udf_count_free failed\n");
1844                 goto out;
1845         }
1846
1847         bm = (struct spaceBitmapDesc *)bh->b_data;
1848         bytes = le32_to_cpu(bm->numOfBytes);
1849         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
1850         ptr = (uint8_t *)bh->b_data;
1851
1852         while ( bytes > 0 )
1853         {
1854                 while ((bytes > 0) && (index < sb->s_blocksize))
1855                 {
1856                         value = ptr[index];
1857                         accum += udf_bitmap_lookup[ value & 0x0f ];
1858                         accum += udf_bitmap_lookup[ value >> 4 ];
1859                         index++;
1860                         bytes--;
1861                 }
1862                 if ( bytes )
1863                 {
1864                         udf_release_data(bh);
1865                         newblock = udf_get_lb_pblock(sb, loc, ++block);
1866                         bh = udf_tread(sb, newblock);
1867                         if (!bh)
1868                         {
1869                                 udf_debug("read failed\n");
1870                                 goto out;
1871                         }
1872                         index = 0;
1873                         ptr = (uint8_t *)bh->b_data;
1874                 }
1875         }
1876         udf_release_data(bh);
1877
1878 out:
1879         unlock_kernel();
1880
1881         return accum;
1882 }
1883
1884 static unsigned int
1885 udf_count_free_table(struct super_block *sb, struct inode * table)
1886 {
1887         unsigned int accum = 0;
1888         uint32_t extoffset, elen;
1889         kernel_lb_addr bloc, eloc;
1890         int8_t etype;
1891         struct buffer_head *bh = NULL;
1892
1893         lock_kernel();
1894
1895         bloc = UDF_I_LOCATION(table);
1896         extoffset = sizeof(struct unallocSpaceEntry);
1897
1898         while ((etype = udf_next_aext(table, &bloc, &extoffset, &eloc, &elen, &bh, 1)) != -1)
1899         {
1900                 accum += (elen >> table->i_sb->s_blocksize_bits);
1901         }
1902         udf_release_data(bh);
1903
1904         unlock_kernel();
1905
1906         return accum;
1907 }
1908
1909 static unsigned int
1910 udf_count_free(struct super_block *sb)
1911 {
1912         unsigned int accum = 0;
1913
1914         if (UDF_SB_LVIDBH(sb))
1915         {
1916                 if (le32_to_cpu(UDF_SB_LVID(sb)->numOfPartitions) > UDF_SB_PARTITION(sb))
1917                 {
1918                         accum = le32_to_cpu(UDF_SB_LVID(sb)->freeSpaceTable[UDF_SB_PARTITION(sb)]);
1919
1920                         if (accum == 0xFFFFFFFF)
1921                                 accum = 0;
1922                 }
1923         }
1924
1925         if (accum)
1926                 return accum;
1927
1928         if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1929         {
1930                 accum += udf_count_free_bitmap(sb,
1931                         UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_bitmap);
1932         }
1933         if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1934         {
1935                 accum += udf_count_free_bitmap(sb,
1936                         UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_bitmap);
1937         }
1938         if (accum)
1939                 return accum;
1940
1941         if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1942         {
1943                 accum += udf_count_free_table(sb,
1944                         UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1945         }
1946         if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1947         {
1948                 accum += udf_count_free_table(sb,
1949                         UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1950         }
1951
1952         return accum;
1953 }