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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 struct kmem_cache * 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, GFP_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, struct kmem_cache * cachep, unsigned long flags)
 134 {
 135         struct udf_inode_info *ei = (struct udf_inode_info *) foo;
 136
 137         if (flags & SLAB_CTOR_CONSTRUCTOR) {
 138                 ei->i_ext.i_data = NULL;
 139                 inode_init_once(&ei->vfs_inode);
 140         }
 141 }
 142
 143 static int init_inodecache(void)
 144 {
 145         udf_inode_cachep = kmem_cache_create("udf_inode_cache",
 146                                              sizeof(struct udf_inode_info),
 147                                              0, (SLAB_RECLAIM_ACCOUNT|
 148                                                 SLAB_MEM_SPREAD),
 149                                              init_once, NULL);
 150         if (udf_inode_cachep == NULL)
 151                 return -ENOMEM;
 152         return 0;
 153 }
 154
 155 static void destroy_inodecache(void)
 156 {
 157         kmem_cache_destroy(udf_inode_cachep);
 158 }
 159
 160 /* Superblock operations */
 161 static const struct super_operations udf_sb_ops = {
 162         .alloc_inode            = udf_alloc_inode,
 163         .destroy_inode          = udf_destroy_inode,
 164         .write_inode            = udf_write_inode,
 165         .delete_inode           = udf_delete_inode,
 166         .clear_inode            = udf_clear_inode,
 167         .put_super              = udf_put_super,
 168         .write_super            = udf_write_super,
 169         .statfs                 = udf_statfs,
 170         .remount_fs             = udf_remount_fs,
 171 };
 172
 173 struct udf_options
 174 {
 175         unsigned char novrs;
 176         unsigned int blocksize;
 177         unsigned int session;
 178         unsigned int lastblock;
 179         unsigned int anchor;
 180         unsigned int volume;
 181         unsigned short partition;
 182         unsigned int fileset;
 183         unsigned int rootdir;
 184         unsigned int flags;
 185         mode_t umask;
 186         gid_t gid;
 187         uid_t uid;
 188         struct nls_table *nls_map;
 189 };
 190
 191 static int __init init_udf_fs(void)
 192 {
 193         int err;
 194         err = init_inodecache();
 195         if (err)
 196                 goto out1;
 197         err = register_filesystem(&udf_fstype);
 198         if (err)
 199                 goto out;
 200         return 0;
 201 out:
 202         destroy_inodecache();
 203 out1:
 204         return err;
 205 }
 206
 207 static void __exit exit_udf_fs(void)
 208 {
 209         unregister_filesystem(&udf_fstype);
 210         destroy_inodecache();
 211 }
 212
 213 module_init(init_udf_fs)
 214 module_exit(exit_udf_fs)
 215
 216 /*
 217  * udf_parse_options
 218  *
 219  * PURPOSE
 220  *      Parse mount options.
 221  *
 222  * DESCRIPTION
 223  *      The following mount options are supported:
 224  *
 225  *      gid=            Set the default group.
 226  *      umask=          Set the default umask.
 227  *      uid=            Set the default user.
 228  *      bs=             Set the block size.
 229  *      unhide          Show otherwise hidden files.
 230  *      undelete        Show deleted files in lists.
 231  *      adinicb         Embed data in the inode (default)
 232  *      noadinicb       Don't embed data in the inode
 233  *      shortad         Use short ad's
 234  *      longad          Use long ad's (default)
 235  *      nostrict        Unset strict conformance
 236  *      iocharset=      Set the NLS character set
 237  *
 238  *      The remaining are for debugging and disaster recovery:
 239  *
 240  *      novrs           Skip volume sequence recognition
 241  *
 242  *      The following expect a offset from 0.
 243  *
 244  *      session=        Set the CDROM session (default= last session)
 245  *      anchor=         Override standard anchor location. (default= 256)
 246  *      volume=         Override the VolumeDesc location. (unused)
 247  *      partition=      Override the PartitionDesc location. (unused)
 248  *      lastblock=      Set the last block of the filesystem/
 249  *
 250  *      The following expect a offset from the partition root.
 251  *
 252  *      fileset=        Override the fileset block location. (unused)
 253  *      rootdir=        Override the root directory location. (unused)
 254  *              WARNING: overriding the rootdir to a non-directory may
 255  *              yield highly unpredictable results.
 256  *
 257  * PRE-CONDITIONS
 258  *      options         Pointer to mount options string.
 259  *      uopts           Pointer to mount options variable.
 260  *
 261  * POST-CONDITIONS
 262  *      <return>        1       Mount options parsed okay.
 263  *      <return>        0       Error parsing mount options.
 264  *
 265  * HISTORY
 266  *      July 1, 1997 - Andrew E. Mileski
 267  *      Written, tested, and released.
 268  */
 269
 270 enum {
 271         Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
 272         Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
 273         Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
 274         Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
 275         Opt_rootdir, Opt_utf8, Opt_iocharset,
 276         Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore
 277 };
 278
 279 static match_table_t tokens = {
 280         {Opt_novrs, "novrs"},
 281         {Opt_nostrict, "nostrict"},
 282         {Opt_bs, "bs=%u"},
 283         {Opt_unhide, "unhide"},
 284         {Opt_undelete, "undelete"},
 285         {Opt_noadinicb, "noadinicb"},
 286         {Opt_adinicb, "adinicb"},
 287         {Opt_shortad, "shortad"},
 288         {Opt_longad, "longad"},
 289         {Opt_uforget, "uid=forget"},
 290         {Opt_uignore, "uid=ignore"},
 291         {Opt_gforget, "gid=forget"},
 292         {Opt_gignore, "gid=ignore"},
 293         {Opt_gid, "gid=%u"},
 294         {Opt_uid, "uid=%u"},
 295         {Opt_umask, "umask=%o"},
 296         {Opt_session, "session=%u"},
 297         {Opt_lastblock, "lastblock=%u"},
 298         {Opt_anchor, "anchor=%u"},
 299         {Opt_volume, "volume=%u"},
 300         {Opt_partition, "partition=%u"},
 301         {Opt_fileset, "fileset=%u"},
 302         {Opt_rootdir, "rootdir=%u"},
 303         {Opt_utf8, "utf8"},
 304         {Opt_iocharset, "iocharset=%s"},
 305         {Opt_err, NULL}
 306 };
 307
 308 static int
 309 udf_parse_options(char *options, struct udf_options *uopt)
 310 {
 311         char *p;
 312         int option;
 313
 314         uopt->novrs = 0;
 315         uopt->blocksize = 2048;
 316         uopt->partition = 0xFFFF;
 317         uopt->session = 0xFFFFFFFF;
 318         uopt->lastblock = 0;
 319         uopt->anchor = 0;
 320         uopt->volume = 0xFFFFFFFF;
 321         uopt->rootdir = 0xFFFFFFFF;
 322         uopt->fileset = 0xFFFFFFFF;
 323         uopt->nls_map = NULL;
 324
 325         if (!options)
 326                 return 1;
 327
 328         while ((p = strsep(&options, ",")) != NULL)
 329         {
 330                 substring_t args[MAX_OPT_ARGS];
 331                 int token;
 332                 if (!*p)
 333                         continue;
 334
 335                 token = match_token(p, tokens, args);
 336                 switch (token)
 337                 {
 338                         case Opt_novrs:
 339                                 uopt->novrs = 1;
 340                         case Opt_bs:
 341                                 if (match_int(&args[0], &option))
 342                                         return 0;
 343                                 uopt->blocksize = option;
 344                                 break;
 345                         case Opt_unhide:
 346                                 uopt->flags |= (1 << UDF_FLAG_UNHIDE);
 347                                 break;
 348                         case Opt_undelete:
 349                                 uopt->flags |= (1 << UDF_FLAG_UNDELETE);
 350                                 break;
 351                         case Opt_noadinicb:
 352                                 uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
 353                                 break;
 354                         case Opt_adinicb:
 355                                 uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
 356                                 break;
 357                         case Opt_shortad:
 358                                 uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
 359                                 break;
 360                         case Opt_longad:
 361                                 uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
 362                                 break;
 363                         case Opt_gid:
 364                                 if (match_int(args, &option))
 365                                         return 0;
 366                                 uopt->gid = option;
 367                                 break;
 368                         case Opt_uid:
 369                                 if (match_int(args, &option))
 370                                         return 0;
 371                                 uopt->uid = option;
 372                                 break;
 373                         case Opt_umask:
 374                                 if (match_octal(args, &option))
 375                                         return 0;
 376                                 uopt->umask = option;
 377                                 break;
 378                         case Opt_nostrict:
 379                                 uopt->flags &= ~(1 << UDF_FLAG_STRICT);
 380                                 break;
 381                         case Opt_session:
 382                                 if (match_int(args, &option))
 383                                         return 0;
 384                                 uopt->session = option;
 385                                 break;
 386                         case Opt_lastblock:
 387                                 if (match_int(args, &option))
 388                                         return 0;
 389                                 uopt->lastblock = option;
 390                                 break;
 391                         case Opt_anchor:
 392                                 if (match_int(args, &option))
 393                                         return 0;
 394                                 uopt->anchor = option;
 395                                 break;
 396                         case Opt_volume:
 397                                 if (match_int(args, &option))
 398                                         return 0;
 399                                 uopt->volume = option;
 400                                 break;
 401                         case Opt_partition:
 402                                 if (match_int(args, &option))
 403                                         return 0;
 404                                 uopt->partition = option;
 405                                 break;
 406                         case Opt_fileset:
 407                                 if (match_int(args, &option))
 408                                         return 0;
 409                                 uopt->fileset = option;
 410                                 break;
 411                         case Opt_rootdir:
 412                                 if (match_int(args, &option))
 413                                         return 0;
 414                                 uopt->rootdir = option;
 415                                 break;
 416                         case Opt_utf8:
 417                                 uopt->flags |= (1 << UDF_FLAG_UTF8);
 418                                 break;
 419 #ifdef CONFIG_UDF_NLS
 420                         case Opt_iocharset:
 421                                 uopt->nls_map = load_nls(args[0].from);
 422                                 uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
 423                                 break;
 424 #endif
 425                         case Opt_uignore:
 426                                 uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
 427                                 break;
 428                         case Opt_uforget:
 429                                 uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
 430                                 break;
 431                         case Opt_gignore:
 432                             uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
 433                                 break;
 434                         case Opt_gforget:
 435                             uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
 436                                 break;
 437                         default:
 438                                 printk(KERN_ERR "udf: bad mount option \"%s\" "
 439                                                 "or missing value\n", p);
 440                         return 0;
 441                 }
 442         }
 443         return 1;
 444 }
 445
 446 void
 447 udf_write_super(struct super_block *sb)
 448 {
 449         lock_kernel();
 450         if (!(sb->s_flags & MS_RDONLY))
 451                 udf_open_lvid(sb);
 452         sb->s_dirt = 0;
 453         unlock_kernel();
 454 }
 455
 456 static int
 457 udf_remount_fs(struct super_block *sb, int *flags, char *options)
 458 {
 459         struct udf_options uopt;
 460
 461         uopt.flags = UDF_SB(sb)->s_flags ;
 462         uopt.uid   = UDF_SB(sb)->s_uid ;
 463         uopt.gid   = UDF_SB(sb)->s_gid ;
 464         uopt.umask = UDF_SB(sb)->s_umask ;
 465
 466         if ( !udf_parse_options(options, &uopt) )
 467                 return -EINVAL;
 468
 469         UDF_SB(sb)->s_flags = uopt.flags;
 470         UDF_SB(sb)->s_uid   = uopt.uid;
 471         UDF_SB(sb)->s_gid   = uopt.gid;
 472         UDF_SB(sb)->s_umask = uopt.umask;
 473
 474         if (UDF_SB_LVIDBH(sb)) {
 475                 int write_rev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev);
 476                 if (write_rev > UDF_MAX_WRITE_VERSION)
 477                         *flags |= MS_RDONLY;
 478         }
 479
 480         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 481                 return 0;
 482         if (*flags & MS_RDONLY)
 483                 udf_close_lvid(sb);
 484         else
 485                 udf_open_lvid(sb);
 486
 487         return 0;
 488 }
 489
 490 /*
 491  * udf_set_blocksize
 492  *
 493  * PURPOSE
 494  *      Set the block size to be used in all transfers.
 495  *
 496  * DESCRIPTION
 497  *      To allow room for a DMA transfer, it is best to guess big when unsure.
 498  *      This routine picks 2048 bytes as the blocksize when guessing. This
 499  *      should be adequate until devices with larger block sizes become common.
 500  *
 501  *      Note that the Linux kernel can currently only deal with blocksizes of
 502  *      512, 1024, 2048, 4096, and 8192 bytes.
 503  *
 504  * PRE-CONDITIONS
 505  *      sb                      Pointer to _locked_ superblock.
 506  *
 507  * POST-CONDITIONS
 508  *      sb->s_blocksize         Blocksize.
 509  *      sb->s_blocksize_bits    log2 of blocksize.
 510  *      <return>        0       Blocksize is valid.
 511  *      <return>        1       Blocksize is invalid.
 512  *
 513  * HISTORY
 514  *      July 1, 1997 - Andrew E. Mileski
 515  *      Written, tested, and released.
 516  */
 517 static  int
 518 udf_set_blocksize(struct super_block *sb, int bsize)
 519 {
 520         if (!sb_min_blocksize(sb, bsize)) {
 521                 udf_debug("Bad block size (%d)\n", bsize);
 522                 printk(KERN_ERR "udf: bad block size (%d)\n", bsize);
 523                 return 0;
 524         }
 525         return sb->s_blocksize;
 526 }
 527
 528 static int
 529 udf_vrs(struct super_block *sb, int silent)
 530 {
 531         struct volStructDesc *vsd = NULL;
 532         int sector = 32768;
 533         int sectorsize;
 534         struct buffer_head *bh = NULL;
 535         int iso9660=0;
 536         int nsr02=0;
 537         int nsr03=0;
 538
 539         /* Block size must be a multiple of 512 */
 540         if (sb->s_blocksize & 511)
 541                 return 0;
 542
 543         if (sb->s_blocksize < sizeof(struct volStructDesc))
 544                 sectorsize = sizeof(struct volStructDesc);
 545         else
 546                 sectorsize = sb->s_blocksize;
 547
 548         sector += (UDF_SB_SESSION(sb) << sb->s_blocksize_bits);
 549
 550         udf_debug("Starting at sector %u (%ld byte sectors)\n",
 551                 (sector >> sb->s_blocksize_bits), sb->s_blocksize);
 552         /* Process the sequence (if applicable) */
 553         for (;!nsr02 && !nsr03; sector += sectorsize)
 554         {
 555                 /* Read a block */
 556                 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
 557                 if (!bh)
 558                         break;
 559
 560                 /* Look for ISO  descriptors */
 561                 vsd = (struct volStructDesc *)(bh->b_data +
 562                         (sector & (sb->s_blocksize - 1)));
 563
 564                 if (vsd->stdIdent[0] == 0)
 565                 {
 566                         udf_release_data(bh);
 567                         break;
 568                 }
 569                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001, VSD_STD_ID_LEN))
 570                 {
 571                         iso9660 = sector;
 572                         switch (vsd->structType)
 573                         {
 574                                 case 0:
 575                                         udf_debug("ISO9660 Boot Record found\n");
 576                                         break;
 577                                 case 1:
 578                                         udf_debug("ISO9660 Primary Volume Descriptor found\n");
 579                                         break;
 580                                 case 2:
 581                                         udf_debug("ISO9660 Supplementary Volume Descriptor found\n");
 582                                         break;
 583                                 case 3:
 584                                         udf_debug("ISO9660 Volume Partition Descriptor found\n");
 585                                         break;
 586                                 case 255:
 587                                         udf_debug("ISO9660 Volume Descriptor Set Terminator found\n");
 588                                         break;
 589                                 default:
 590                                         udf_debug("ISO9660 VRS (%u) found\n", vsd->structType);
 591                                         break;
 592                         }
 593                 }
 594                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01, VSD_STD_ID_LEN))
 595                 {
 596                 }
 597                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01, VSD_STD_ID_LEN))
 598                 {
 599                         udf_release_data(bh);
 600                         break;
 601                 }
 602                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02, VSD_STD_ID_LEN))
 603                 {
 604                         nsr02 = sector;
 605                 }
 606                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03, VSD_STD_ID_LEN))
 607                 {
 608                         nsr03 = sector;
 609                 }
 610                 udf_release_data(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
 641 udf_find_anchor(struct super_block *sb)
 642 {
 643         int lastblock = UDF_SB_LASTBLOCK(sb);
 644         struct buffer_head *bh = NULL;
 645         uint16_t ident;
 646         uint32_t location;
 647         int i;
 648
 649         if (lastblock)
 650         {
 651                 int varlastblock = udf_variable_to_fixed(lastblock);
 652                 int last[] =  { lastblock, lastblock - 2,
 653                                 lastblock - 150, lastblock - 152,
 654                                 varlastblock, varlastblock - 2,
 655                                 varlastblock - 150, varlastblock - 152 };
 656
 657                 lastblock = 0;
 658
 659                 /* Search for an anchor volume descriptor pointer */
 660
 661                 /*  according to spec, anchor is in either:
 662                  *     block 256
 663                  *     lastblock-256
 664                  *     lastblock
 665                  *  however, if the disc isn't closed, it could be 512 */
 666
 667                 for (i = 0; !lastblock && i < ARRAY_SIZE(last); i++) {
 668                         if (last[i] < 0 || !(bh = sb_bread(sb, last[i])))
 669                         {
 670                                 ident = location = 0;
 671                         }
 672                         else
 673                         {
 674                                 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
 675                                 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
 676                                 udf_release_data(bh);
 677                         }
 678
 679                         if (ident == TAG_IDENT_AVDP)
 680                         {
 681                                 if (location == last[i] - UDF_SB_SESSION(sb))
 682                                 {
 683                                         lastblock = UDF_SB_ANCHOR(sb)[0] = last[i] - UDF_SB_SESSION(sb);
 684                                         UDF_SB_ANCHOR(sb)[1] = last[i] - 256 - UDF_SB_SESSION(sb);
 685                                 }
 686                                 else if (location == udf_variable_to_fixed(last[i]) - UDF_SB_SESSION(sb))
 687                                 {
 688                                         UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
 689                                         lastblock = UDF_SB_ANCHOR(sb)[0] = udf_variable_to_fixed(last[i]) - UDF_SB_SESSION(sb);
 690                                         UDF_SB_ANCHOR(sb)[1] = lastblock - 256 - UDF_SB_SESSION(sb);
 691                                 }
 692                                 else
 693                                         udf_debug("Anchor found at block %d, location mismatch %d.\n",
 694                                                 last[i], location);
 695                         }
 696                         else if (ident == TAG_IDENT_FE || ident == TAG_IDENT_EFE)
 697                         {
 698                                 lastblock = last[i];
 699                                 UDF_SB_ANCHOR(sb)[3] = 512;
 700                         }
 701                         else
 702                         {
 703                                 if (last[i] < 256 || !(bh = sb_bread(sb, last[i] - 256)))
 704                                 {
 705                                         ident = location = 0;
 706                                 }
 707                                 else
 708                                 {
 709                                         ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
 710                                         location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
 711                                         udf_release_data(bh);
 712                                 }
 713
 714                                 if (ident == TAG_IDENT_AVDP &&
 715                                         location == last[i] - 256 - UDF_SB_SESSION(sb))
 716                                 {
 717                                         lastblock = last[i];
 718                                         UDF_SB_ANCHOR(sb)[1] = last[i] - 256;
 719                                 }
 720                                 else
 721                                 {
 722                                         if (last[i] < 312 + UDF_SB_SESSION(sb) || !(bh = sb_bread(sb, last[i] - 312 - UDF_SB_SESSION(sb))))
 723                                         {
 724                                                 ident = location = 0;
 725                                         }
 726                                         else
 727                                         {
 728                                                 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
 729                                                 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
 730                                                 udf_release_data(bh);
 731                                         }
 732
 733                                         if (ident == TAG_IDENT_AVDP &&
 734                                                 location == udf_variable_to_fixed(last[i]) - 256)
 735                                         {
 736                                                 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
 737                                                 lastblock = udf_variable_to_fixed(last[i]);
 738                                                 UDF_SB_ANCHOR(sb)[1] = lastblock - 256;
 739                                         }
 740                                 }
 741                         }
 742                 }
 743         }
 744
 745         if (!lastblock)
 746         {
 747                 /* We havn't found the lastblock. check 312 */
 748                 if ((bh = sb_bread(sb, 312 + UDF_SB_SESSION(sb))))
 749                 {
 750                         ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
 751                         location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
 752                         udf_release_data(bh);
 753
 754                         if (ident == TAG_IDENT_AVDP && location == 256)
 755                                 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
 756                 }
 757         }
 758
 759         for (i = 0; i < ARRAY_SIZE(UDF_SB_ANCHOR(sb)); i++) {
 760                 if (UDF_SB_ANCHOR(sb)[i])
 761                 {
 762                         if (!(bh = udf_read_tagged(sb,
 763                                 UDF_SB_ANCHOR(sb)[i], UDF_SB_ANCHOR(sb)[i], &ident)))
 764                         {
 765                                 UDF_SB_ANCHOR(sb)[i] = 0;
 766                         }
 767                         else
 768                         {
 769                                 udf_release_data(bh);
 770                                 if ((ident != TAG_IDENT_AVDP) && (i ||
 771                                         (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE)))
 772                                 {
 773                                         UDF_SB_ANCHOR(sb)[i] = 0;
 774                                 }
 775                         }
 776                 }
 777         }
 778
 779         UDF_SB_LASTBLOCK(sb) = lastblock;
 780 }
 781
 782 static int
 783 udf_find_fileset(struct super_block *sb, kernel_lb_addr *fileset, kernel_lb_addr *root)
 784 {
 785         struct buffer_head *bh = NULL;
 786         long lastblock;
 787         uint16_t ident;
 788
 789         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
 790                 fileset->partitionReferenceNum != 0xFFFF)
 791         {
 792                 bh = udf_read_ptagged(sb, *fileset, 0, &ident);
 793
 794                 if (!bh)
 795                         return 1;
 796                 else if (ident != TAG_IDENT_FSD)
 797                 {
 798                         udf_release_data(bh);
 799                         return 1;
 800                 }
 801
 802         }
 803
 804         if (!bh) /* Search backwards through the partitions */
 805         {
 806                 kernel_lb_addr newfileset;
 807
 808                 return 1;
 809
 810                 for (newfileset.partitionReferenceNum=UDF_SB_NUMPARTS(sb)-1;
 811                         (newfileset.partitionReferenceNum != 0xFFFF &&
 812                                 fileset->logicalBlockNum == 0xFFFFFFFF &&
 813                                 fileset->partitionReferenceNum == 0xFFFF);
 814                         newfileset.partitionReferenceNum--)
 815                 {
 816                         lastblock = UDF_SB_PARTLEN(sb, newfileset.partitionReferenceNum);
 817                         newfileset.logicalBlockNum = 0;
 818
 819                         do
 820                         {
 821                                 bh = udf_read_ptagged(sb, newfileset, 0, &ident);
 822                                 if (!bh)
 823                                 {
 824                                         newfileset.logicalBlockNum ++;
 825                                         continue;
 826                                 }
 827
 828                                 switch (ident)
 829                                 {
 830                                         case TAG_IDENT_SBD:
 831                                         {
 832                                                 struct spaceBitmapDesc *sp;
 833                                                 sp = (struct spaceBitmapDesc *)bh->b_data;
 834                                                 newfileset.logicalBlockNum += 1 +
 835                                                         ((le32_to_cpu(sp->numOfBytes) + sizeof(struct spaceBitmapDesc) - 1)
 836                                                                 >> sb->s_blocksize_bits);
 837                                                 udf_release_data(bh);
 838                                                 break;
 839                                         }
 840                                         case TAG_IDENT_FSD:
 841                                         {
 842                                                 *fileset = newfileset;
 843                                                 break;
 844                                         }
 845                                         default:
 846                                         {
 847                                                 newfileset.logicalBlockNum ++;
 848                                                 udf_release_data(bh);
 849                                                 bh = NULL;
 850                                                 break;
 851                                         }
 852                                 }
 853                         }
 854                         while (newfileset.logicalBlockNum < lastblock &&
 855                                 fileset->logicalBlockNum == 0xFFFFFFFF &&
 856                                 fileset->partitionReferenceNum == 0xFFFF);
 857                 }
 858         }
 859
 860         if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
 861                 fileset->partitionReferenceNum != 0xFFFF) && bh)
 862         {
 863                 udf_debug("Fileset at block=%d, partition=%d\n",
 864                         fileset->logicalBlockNum, fileset->partitionReferenceNum);
 865
 866                 UDF_SB_PARTITION(sb) = fileset->partitionReferenceNum;
 867                 udf_load_fileset(sb, bh, root);
 868                 udf_release_data(bh);
 869                 return 0;
 870         }
 871         return 1;
 872 }
 873
 874 static void
 875 udf_load_pvoldesc(struct super_block *sb, struct buffer_head *bh)
 876 {
 877         struct primaryVolDesc *pvoldesc;
 878         time_t recording;
 879         long recording_usec;
 880         struct ustr instr;
 881         struct ustr outstr;
 882
 883         pvoldesc = (struct primaryVolDesc *)bh->b_data;
 884
 885         if ( udf_stamp_to_time(&recording, &recording_usec,
 886                 lets_to_cpu(pvoldesc->recordingDateAndTime)) )
 887         {
 888                 kernel_timestamp ts;
 889                 ts = lets_to_cpu(pvoldesc->recordingDateAndTime);
 890                 udf_debug("recording time %ld/%ld, %04u/%02u/%02u %02u:%02u (%x)\n",
 891                         recording, recording_usec,
 892                         ts.year, ts.month, ts.day, ts.hour, ts.minute, ts.typeAndTimezone);
 893                 UDF_SB_RECORDTIME(sb).tv_sec = recording;
 894                 UDF_SB_RECORDTIME(sb).tv_nsec = recording_usec * 1000;
 895         }
 896
 897         if ( !udf_build_ustr(&instr, pvoldesc->volIdent, 32) )
 898         {
 899                 if (udf_CS0toUTF8(&outstr, &instr))
 900                 {
 901                         strncpy( UDF_SB_VOLIDENT(sb), outstr.u_name,
 902                                 outstr.u_len > 31 ? 31 : outstr.u_len);
 903                         udf_debug("volIdent[] = '%s'\n", UDF_SB_VOLIDENT(sb));
 904                 }
 905         }
 906
 907         if ( !udf_build_ustr(&instr, pvoldesc->volSetIdent, 128) )
 908         {
 909                 if (udf_CS0toUTF8(&outstr, &instr))
 910                         udf_debug("volSetIdent[] = '%s'\n", outstr.u_name);
 911         }
 912 }
 913
 914 static void
 915 udf_load_fileset(struct super_block *sb, struct buffer_head *bh, kernel_lb_addr *root)
 916 {
 917         struct fileSetDesc *fset;
 918
 919         fset = (struct fileSetDesc *)bh->b_data;
 920
 921         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
 922
 923         UDF_SB_SERIALNUM(sb) = le16_to_cpu(fset->descTag.tagSerialNum);
 924
 925         udf_debug("Rootdir at block=%d, partition=%d\n",
 926                 root->logicalBlockNum, root->partitionReferenceNum);
 927 }
 928
 929 static void
 930 udf_load_partdesc(struct super_block *sb, struct buffer_head *bh)
 931 {
 932         struct partitionDesc *p;
 933         int i;
 934
 935         p = (struct partitionDesc *)bh->b_data;
 936
 937         for (i=0; i<UDF_SB_NUMPARTS(sb); i++)
 938         {
 939                 udf_debug("Searching map: (%d == %d)\n",
 940                         UDF_SB_PARTMAPS(sb)[i].s_partition_num, le16_to_cpu(p->partitionNumber));
 941                 if (UDF_SB_PARTMAPS(sb)[i].s_partition_num == le16_to_cpu(p->partitionNumber))
 942                 {
 943                         UDF_SB_PARTLEN(sb,i) = le32_to_cpu(p->partitionLength); /* blocks */
 944                         UDF_SB_PARTROOT(sb,i) = le32_to_cpu(p->partitionStartingLocation);
 945                         if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_READ_ONLY)
 946                                 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_READ_ONLY;
 947                         if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_WRITE_ONCE)
 948                                 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_WRITE_ONCE;
 949                         if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_REWRITABLE)
 950                                 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_REWRITABLE;
 951                         if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_OVERWRITABLE)
 952                                 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_OVERWRITABLE;
 953
 954                         if (!strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) ||
 955                                 !strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
 956                         {
 957                                 struct partitionHeaderDesc *phd;
 958
 959                                 phd = (struct partitionHeaderDesc *)(p->partitionContentsUse);
 960                                 if (phd->unallocSpaceTable.extLength)
 961                                 {
 962                                         kernel_lb_addr loc = { le32_to_cpu(phd->unallocSpaceTable.extPosition), i };
 963
 964                                         UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table =
 965                                                 udf_iget(sb, loc);
 966                                         UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_UNALLOC_TABLE;
 967                                         udf_debug("unallocSpaceTable (part %d) @ %ld\n",
 968                                                 i, UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table->i_ino);
 969                                 }
 970                                 if (phd->unallocSpaceBitmap.extLength)
 971                                 {
 972                                         UDF_SB_ALLOC_BITMAP(sb, i, s_uspace);
 973                                         if (UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap != NULL)
 974                                         {
 975                                                 UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extLength =
 976                                                         le32_to_cpu(phd->unallocSpaceBitmap.extLength);
 977                                                 UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extPosition =
 978                                                         le32_to_cpu(phd->unallocSpaceBitmap.extPosition);
 979                                                 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_UNALLOC_BITMAP;
 980                                                 udf_debug("unallocSpaceBitmap (part %d) @ %d\n",
 981                                                         i, UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extPosition);
 982                                         }
 983                                 }
 984                                 if (phd->partitionIntegrityTable.extLength)
 985                                         udf_debug("partitionIntegrityTable (part %d)\n", i);
 986                                 if (phd->freedSpaceTable.extLength)
 987                                 {
 988                                         kernel_lb_addr loc = { le32_to_cpu(phd->freedSpaceTable.extPosition), i };
 989
 990                                         UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table =
 991                                                 udf_iget(sb, loc);
 992                                         UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_FREED_TABLE;
 993                                         udf_debug("freedSpaceTable (part %d) @ %ld\n",
 994                                                 i, UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table->i_ino);
 995                                 }
 996                                 if (phd->freedSpaceBitmap.extLength)
 997                                 {
 998                                         UDF_SB_ALLOC_BITMAP(sb, i, s_fspace);
 999                                         if (UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap != NULL)
1000                                         {
1001                                                 UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extLength =
1002                                                         le32_to_cpu(phd->freedSpaceBitmap.extLength);
1003                                                 UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extPosition =
1004                                                         le32_to_cpu(phd->freedSpaceBitmap.extPosition);
1005                                                 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_FREED_BITMAP;
1006                                                 udf_debug("freedSpaceBitmap (part %d) @ %d\n",
1007                                                         i, UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extPosition);
1008                                         }
1009                                 }
1010                         }
1011                         break;
1012                 }
1013         }
1014         if (i == UDF_SB_NUMPARTS(sb))
1015         {
1016                 udf_debug("Partition (%d) not found in partition map\n", le16_to_cpu(p->partitionNumber));
1017         }
1018         else
1019         {
1020                 udf_debug("Partition (%d:%d type %x) starts at physical %d, block length %d\n",
1021                         le16_to_cpu(p->partitionNumber), i, UDF_SB_PARTTYPE(sb,i),
1022                         UDF_SB_PARTROOT(sb,i), UDF_SB_PARTLEN(sb,i));
1023         }
1024 }
1025
1026 static int
1027 udf_load_logicalvol(struct super_block *sb, struct buffer_head * bh, kernel_lb_addr *fileset)
1028 {
1029         struct logicalVolDesc *lvd;
1030         int i, j, offset;
1031         uint8_t type;
1032
1033         lvd = (struct logicalVolDesc *)bh->b_data;
1034
1035         UDF_SB_ALLOC_PARTMAPS(sb, le32_to_cpu(lvd->numPartitionMaps));
1036
1037         for (i=0,offset=0;
1038                  i<UDF_SB_NUMPARTS(sb) && offset<le32_to_cpu(lvd->mapTableLength);
1039                  i++,offset+=((struct genericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapLength)
1040         {
1041                 type = ((struct genericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapType;
1042                 if (type == 1)
1043                 {
1044                         struct genericPartitionMap1 *gpm1 = (struct genericPartitionMap1 *)&(lvd->partitionMaps[offset]);
1045                         UDF_SB_PARTTYPE(sb,i) = UDF_TYPE1_MAP15;
1046                         UDF_SB_PARTVSN(sb,i) = le16_to_cpu(gpm1->volSeqNum);
1047                         UDF_SB_PARTNUM(sb,i) = le16_to_cpu(gpm1->partitionNum);
1048                         UDF_SB_PARTFUNC(sb,i) = NULL;
1049                 }
1050                 else if (type == 2)
1051                 {
1052                         struct udfPartitionMap2 *upm2 = (struct udfPartitionMap2 *)&(lvd->partitionMaps[offset]);
1053                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL, strlen(UDF_ID_VIRTUAL)))
1054                         {
1055                                 if (le16_to_cpu(((__le16 *)upm2->partIdent.identSuffix)[0]) == 0x0150)
1056                                 {
1057                                         UDF_SB_PARTTYPE(sb,i) = UDF_VIRTUAL_MAP15;
1058                                         UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_virt15;
1059                                 }
1060                                 else if (le16_to_cpu(((__le16 *)upm2->partIdent.identSuffix)[0]) == 0x0200)
1061                                 {
1062                                         UDF_SB_PARTTYPE(sb,i) = UDF_VIRTUAL_MAP20;
1063                                         UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_virt20;
1064                                 }
1065                         }
1066                         else if (!strncmp(upm2->partIdent.ident, UDF_ID_SPARABLE, strlen(UDF_ID_SPARABLE)))
1067                         {
1068                                 uint32_t loc;
1069                                 uint16_t ident;
1070                                 struct sparingTable *st;
1071                                 struct sparablePartitionMap *spm = (struct sparablePartitionMap *)&(lvd->partitionMaps[offset]);
1072
1073                                 UDF_SB_PARTTYPE(sb,i) = UDF_SPARABLE_MAP15;
1074                                 UDF_SB_TYPESPAR(sb,i).s_packet_len = le16_to_cpu(spm->packetLength);
1075                                 for (j=0; j<spm->numSparingTables; j++)
1076                                 {
1077                                         loc = le32_to_cpu(spm->locSparingTable[j]);
1078                                         UDF_SB_TYPESPAR(sb,i).s_spar_map[j] =
1079                                                 udf_read_tagged(sb, loc, loc, &ident);
1080                                         if (UDF_SB_TYPESPAR(sb,i).s_spar_map[j] != NULL)
1081                                         {
1082                                                 st = (struct sparingTable *)UDF_SB_TYPESPAR(sb,i).s_spar_map[j]->b_data;
1083                                                 if (ident != 0 ||
1084                                                         strncmp(st->sparingIdent.ident, UDF_ID_SPARING, strlen(UDF_ID_SPARING)))
1085                                                 {
1086                                                         udf_release_data(UDF_SB_TYPESPAR(sb,i).s_spar_map[j]);
1087                                                         UDF_SB_TYPESPAR(sb,i).s_spar_map[j] = NULL;
1088                                                 }
1089                                         }
1090                                 }
1091                                 UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_spar15;
1092                         }
1093                         else
1094                         {
1095                                 udf_debug("Unknown ident: %s\n", upm2->partIdent.ident);
1096                                 continue;
1097                         }
1098                         UDF_SB_PARTVSN(sb,i) = le16_to_cpu(upm2->volSeqNum);
1099                         UDF_SB_PARTNUM(sb,i) = le16_to_cpu(upm2->partitionNum);
1100                 }
1101                 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1102                         i, UDF_SB_PARTNUM(sb,i), type, UDF_SB_PARTVSN(sb,i));
1103         }
1104
1105         if (fileset)
1106         {
1107                 long_ad *la = (long_ad *)&(lvd->logicalVolContentsUse[0]);
1108
1109                 *fileset = lelb_to_cpu(la->extLocation);
1110                 udf_debug("FileSet found in LogicalVolDesc at block=%d, partition=%d\n",
1111                         fileset->logicalBlockNum,
1112                         fileset->partitionReferenceNum);
1113         }
1114         if (lvd->integritySeqExt.extLength)
1115                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1116         return 0;
1117 }
1118
1119 /*
1120  * udf_load_logicalvolint
1121  *
1122  */
1123 static void
1124 udf_load_logicalvolint(struct super_block *sb, kernel_extent_ad loc)
1125 {
1126         struct buffer_head *bh = NULL;
1127         uint16_t ident;
1128
1129         while (loc.extLength > 0 &&
1130                 (bh = udf_read_tagged(sb, loc.extLocation,
1131                         loc.extLocation, &ident)) &&
1132                 ident == TAG_IDENT_LVID)
1133         {
1134                 UDF_SB_LVIDBH(sb) = bh;
1135
1136                 if (UDF_SB_LVID(sb)->nextIntegrityExt.extLength)
1137                         udf_load_logicalvolint(sb, leea_to_cpu(UDF_SB_LVID(sb)->nextIntegrityExt));
1138
1139                 if (UDF_SB_LVIDBH(sb) != bh)
1140                         udf_release_data(bh);
1141                 loc.extLength -= sb->s_blocksize;
1142                 loc.extLocation ++;
1143         }
1144         if (UDF_SB_LVIDBH(sb) != bh)
1145                 udf_release_data(bh);
1146 }
1147
1148 /*
1149  * udf_process_sequence
1150  *
1151  * PURPOSE
1152  *      Process a main/reserve volume descriptor sequence.
1153  *
1154  * PRE-CONDITIONS
1155  *      sb                      Pointer to _locked_ superblock.
1156  *      block                   First block of first extent of the sequence.
1157  *      lastblock               Lastblock of first extent of the sequence.
1158  *
1159  * HISTORY
1160  *      July 1, 1997 - Andrew E. Mileski
1161  *      Written, tested, and released.
1162  */
1163 static  int
1164 udf_process_sequence(struct super_block *sb, long block, long lastblock, kernel_lb_addr *fileset)
1165 {
1166         struct buffer_head *bh = NULL;
1167         struct udf_vds_record vds[VDS_POS_LENGTH];
1168         struct generic_desc *gd;
1169         struct volDescPtr *vdp;
1170         int done=0;
1171         int i,j;
1172         uint32_t vdsn;
1173         uint16_t ident;
1174         long next_s = 0, next_e = 0;
1175
1176         memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1177
1178         /* Read the main descriptor sequence */
1179         for (;(!done && block <= lastblock); block++)
1180         {
1181
1182                 bh = udf_read_tagged(sb, block, block, &ident);
1183                 if (!bh)
1184                         break;
1185
1186                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1187                 gd = (struct generic_desc *)bh->b_data;
1188                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1189                 switch (ident)
1190                 {
1191                         case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1192                                 if (vdsn >= vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum)
1193                                 {
1194                                         vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum = vdsn;
1195                                         vds[VDS_POS_PRIMARY_VOL_DESC].block = block;
1196                                 }
1197                                 break;
1198                         case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1199                                 if (vdsn >= vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum)
1200                                 {
1201                                         vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum = vdsn;
1202                                         vds[VDS_POS_VOL_DESC_PTR].block = block;
1203
1204                                         vdp = (struct volDescPtr *)bh->b_data;
1205                                         next_s = le32_to_cpu(vdp->nextVolDescSeqExt.extLocation);
1206                                         next_e = le32_to_cpu(vdp->nextVolDescSeqExt.extLength);
1207                                         next_e = next_e >> sb->s_blocksize_bits;
1208                                         next_e += next_s;
1209                                 }
1210                                 break;
1211                         case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1212                                 if (vdsn >= vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum)
1213                                 {
1214                                         vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum = vdsn;
1215                                         vds[VDS_POS_IMP_USE_VOL_DESC].block = block;
1216                                 }
1217                                 break;
1218                         case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1219                                 if (!vds[VDS_POS_PARTITION_DESC].block)
1220                                         vds[VDS_POS_PARTITION_DESC].block = block;
1221                                 break;
1222                         case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1223                                 if (vdsn >= vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum)
1224                                 {
1225                                         vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum = vdsn;
1226                                         vds[VDS_POS_LOGICAL_VOL_DESC].block = block;
1227                                 }
1228                                 break;
1229                         case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1230                                 if (vdsn >= vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum)
1231                                 {
1232                                         vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum = vdsn;
1233                                         vds[VDS_POS_UNALLOC_SPACE_DESC].block = block;
1234                                 }
1235                                 break;
1236                         case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1237                                 vds[VDS_POS_TERMINATING_DESC].block = block;
1238                                 if (next_e)
1239                                 {
1240                                         block = next_s;
1241                                         lastblock = next_e;
1242                                         next_s = next_e = 0;
1243                                 }
1244                                 else
1245                                         done = 1;
1246                                 break;
1247                 }
1248                 udf_release_data(bh);
1249         }
1250         for (i=0; i<VDS_POS_LENGTH; i++)
1251         {
1252                 if (vds[i].block)
1253                 {
1254                         bh = udf_read_tagged(sb, vds[i].block, vds[i].block, &ident);
1255
1256                         if (i == VDS_POS_PRIMARY_VOL_DESC)
1257                                 udf_load_pvoldesc(sb, bh);
1258                         else if (i == VDS_POS_LOGICAL_VOL_DESC)
1259                                 udf_load_logicalvol(sb, bh, fileset);
1260                         else if (i == VDS_POS_PARTITION_DESC)
1261                         {
1262                                 struct buffer_head *bh2 = NULL;
1263                                 udf_load_partdesc(sb, bh);
1264                                 for (j=vds[i].block+1; j<vds[VDS_POS_TERMINATING_DESC].block; j++)
1265                                 {
1266                                         bh2 = udf_read_tagged(sb, j, j, &ident);
1267                                         gd = (struct generic_desc *)bh2->b_data;
1268                                         if (ident == TAG_IDENT_PD)
1269                                                 udf_load_partdesc(sb, bh2);
1270                                         udf_release_data(bh2);
1271                                 }
1272                         }
1273                         udf_release_data(bh);
1274                 }
1275         }
1276
1277         return 0;
1278 }
1279
1280 /*
1281  * udf_check_valid()
1282  */
1283 static int
1284 udf_check_valid(struct super_block *sb, int novrs, int silent)
1285 {
1286         long block;
1287
1288         if (novrs)
1289         {
1290                 udf_debug("Validity check skipped because of novrs option\n");
1291                 return 0;
1292         }
1293         /* Check that it is NSR02 compliant */
1294         /* Process any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
1295         else if ((block = udf_vrs(sb, silent)) == -1)
1296         {
1297                 udf_debug("Failed to read byte 32768. Assuming open disc. Skipping validity check\n");
1298                 if (!UDF_SB_LASTBLOCK(sb))
1299                         UDF_SB_LASTBLOCK(sb) = udf_get_last_block(sb);
1300                 return 0;
1301         }
1302         else
1303                 return !block;
1304 }
1305
1306 static int
1307 udf_load_partition(struct super_block *sb, kernel_lb_addr *fileset)
1308 {
1309         struct anchorVolDescPtr *anchor;
1310         uint16_t ident;
1311         struct buffer_head *bh;
1312         long main_s, main_e, reserve_s, reserve_e;
1313         int i, j;
1314
1315         if (!sb)
1316                 return 1;
1317
1318         for (i = 0; i < ARRAY_SIZE(UDF_SB_ANCHOR(sb)); i++) {
1319                 if (UDF_SB_ANCHOR(sb)[i] && (bh = udf_read_tagged(sb,
1320                         UDF_SB_ANCHOR(sb)[i], UDF_SB_ANCHOR(sb)[i], &ident)))
1321                 {
1322                         anchor = (struct anchorVolDescPtr *)bh->b_data;
1323
1324                         /* Locate the main sequence */
1325                         main_s = le32_to_cpu( anchor->mainVolDescSeqExt.extLocation );
1326                         main_e = le32_to_cpu( anchor->mainVolDescSeqExt.extLength );
1327                         main_e = main_e >> sb->s_blocksize_bits;
1328                         main_e += main_s;
1329
1330                         /* Locate the reserve sequence */
1331                         reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1332                         reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1333                         reserve_e = reserve_e >> sb->s_blocksize_bits;
1334                         reserve_e += reserve_s;
1335
1336                         udf_release_data(bh);
1337
1338                         /* Process the main & reserve sequences */
1339                         /* responsible for finding the PartitionDesc(s) */
1340                         if (!(udf_process_sequence(sb, main_s, main_e, fileset) &&
1341                                 udf_process_sequence(sb, reserve_s, reserve_e, fileset)))
1342                         {
1343                                 break;
1344                         }
1345                 }
1346         }
1347
1348         if (i == ARRAY_SIZE(UDF_SB_ANCHOR(sb))) {
1349                 udf_debug("No Anchor block found\n");
1350                 return 1;
1351         } else
1352                 udf_debug("Using anchor in block %d\n", UDF_SB_ANCHOR(sb)[i]);
1353
1354         for (i=0; i<UDF_SB_NUMPARTS(sb); i++)
1355         {
1356                 switch UDF_SB_PARTTYPE(sb, i)
1357                 {
1358                         case UDF_VIRTUAL_MAP15:
1359                         case UDF_VIRTUAL_MAP20:
1360                         {
1361                                 kernel_lb_addr ino;
1362
1363                                 if (!UDF_SB_LASTBLOCK(sb))
1364                                 {
1365                                         UDF_SB_LASTBLOCK(sb) = udf_get_last_block(sb);
1366                                         udf_find_anchor(sb);
1367                                 }
1368
1369                                 if (!UDF_SB_LASTBLOCK(sb))
1370                                 {
1371                                         udf_debug("Unable to determine Lastblock (For Virtual Partition)\n");
1372                                         return 1;
1373                                 }
1374
1375                                 for (j=0; j<UDF_SB_NUMPARTS(sb); j++)
1376                                 {
1377                                         if (j != i &&
1378                                                 UDF_SB_PARTVSN(sb,i) == UDF_SB_PARTVSN(sb,j) &&
1379                                                 UDF_SB_PARTNUM(sb,i) == UDF_SB_PARTNUM(sb,j))
1380                                         {
1381                                                 ino.partitionReferenceNum = j;
1382                                                 ino.logicalBlockNum = UDF_SB_LASTBLOCK(sb) -
1383                                                         UDF_SB_PARTROOT(sb,j);
1384                                                 break;
1385                                         }
1386                                 }
1387
1388                                 if (j == UDF_SB_NUMPARTS(sb))
1389                                         return 1;
1390
1391                                 if (!(UDF_SB_VAT(sb) = udf_iget(sb, ino)))
1392                                         return 1;
1393
1394                                 if (UDF_SB_PARTTYPE(sb,i) == UDF_VIRTUAL_MAP15)
1395                                 {
1396                                         UDF_SB_TYPEVIRT(sb,i).s_start_offset = udf_ext0_offset(UDF_SB_VAT(sb));
1397                                         UDF_SB_TYPEVIRT(sb,i).s_num_entries = (UDF_SB_VAT(sb)->i_size - 36) >> 2;
1398                                 }
1399                                 else if (UDF_SB_PARTTYPE(sb,i) == UDF_VIRTUAL_MAP20)
1400                                 {
1401                                         struct buffer_head *bh = NULL;
1402                                         uint32_t pos;
1403
1404                                         pos = udf_block_map(UDF_SB_VAT(sb), 0);
1405                                         bh = sb_bread(sb, pos);
1406                                         UDF_SB_TYPEVIRT(sb,i).s_start_offset =
1407                                                 le16_to_cpu(((struct virtualAllocationTable20 *)bh->b_data + udf_ext0_offset(UDF_SB_VAT(sb)))->lengthHeader) +
1408                                                         udf_ext0_offset(UDF_SB_VAT(sb));
1409                                         UDF_SB_TYPEVIRT(sb,i).s_num_entries = (UDF_SB_VAT(sb)->i_size -
1410                                                 UDF_SB_TYPEVIRT(sb,i).s_start_offset) >> 2;
1411                                         udf_release_data(bh);
1412                                 }
1413                                 UDF_SB_PARTROOT(sb,i) = udf_get_pblock(sb, 0, i, 0);
1414                                 UDF_SB_PARTLEN(sb,i) = UDF_SB_PARTLEN(sb,ino.partitionReferenceNum);
1415                         }
1416                 }
1417         }
1418         return 0;
1419 }
1420
1421 static void udf_open_lvid(struct super_block *sb)
1422 {
1423         if (UDF_SB_LVIDBH(sb))
1424         {
1425                 int i;
1426                 kernel_timestamp cpu_time;
1427
1428                 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1429                 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1430                 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
1431                         UDF_SB_LVID(sb)->recordingDateAndTime = cpu_to_lets(cpu_time);
1432                 UDF_SB_LVID(sb)->integrityType = LVID_INTEGRITY_TYPE_OPEN;
1433
1434                 UDF_SB_LVID(sb)->descTag.descCRC =
1435                         cpu_to_le16(udf_crc((char *)UDF_SB_LVID(sb) + sizeof(tag),
1436                         le16_to_cpu(UDF_SB_LVID(sb)->descTag.descCRCLength), 0));
1437
1438                 UDF_SB_LVID(sb)->descTag.tagChecksum = 0;
1439                 for (i=0; i<16; i++)
1440                         if (i != 4)
1441                                 UDF_SB_LVID(sb)->descTag.tagChecksum +=
1442                                         ((uint8_t *)&(UDF_SB_LVID(sb)->descTag))[i];
1443
1444                 mark_buffer_dirty(UDF_SB_LVIDBH(sb));
1445         }
1446 }
1447
1448 static void udf_close_lvid(struct super_block *sb)
1449 {
1450         if (UDF_SB_LVIDBH(sb) &&
1451                 UDF_SB_LVID(sb)->integrityType == LVID_INTEGRITY_TYPE_OPEN)
1452         {
1453                 int i;
1454                 kernel_timestamp cpu_time;
1455
1456                 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1457                 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1458                 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
1459                         UDF_SB_LVID(sb)->recordingDateAndTime = cpu_to_lets(cpu_time);
1460                 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(UDF_SB_LVIDIU(sb)->maxUDFWriteRev))
1461                         UDF_SB_LVIDIU(sb)->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1462                 if (UDF_SB_UDFREV(sb) > le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev))
1463                         UDF_SB_LVIDIU(sb)->minUDFReadRev = cpu_to_le16(UDF_SB_UDFREV(sb));
1464                 if (UDF_SB_UDFREV(sb) > le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev))
1465                         UDF_SB_LVIDIU(sb)->minUDFWriteRev = cpu_to_le16(UDF_SB_UDFREV(sb));
1466                 UDF_SB_LVID(sb)->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1467
1468                 UDF_SB_LVID(sb)->descTag.descCRC =
1469                         cpu_to_le16(udf_crc((char *)UDF_SB_LVID(sb) + sizeof(tag),
1470                         le16_to_cpu(UDF_SB_LVID(sb)->descTag.descCRCLength), 0));
1471
1472                 UDF_SB_LVID(sb)->descTag.tagChecksum = 0;
1473                 for (i=0; i<16; i++)
1474                         if (i != 4)
1475                                 UDF_SB_LVID(sb)->descTag.tagChecksum +=
1476                                         ((uint8_t *)&(UDF_SB_LVID(sb)->descTag))[i];
1477
1478                 mark_buffer_dirty(UDF_SB_LVIDBH(sb));
1479         }
1480 }
1481
1482 /*
1483  * udf_read_super
1484  *
1485  * PURPOSE
1486  *      Complete the specified super block.
1487  *
1488  * PRE-CONDITIONS
1489  *      sb                      Pointer to superblock to complete - never NULL.
1490  *      sb->s_dev               Device to read suberblock from.
1491  *      options                 Pointer to mount options.
1492  *      silent                  Silent flag.
1493  *
1494  * HISTORY
1495  *      July 1, 1997 - Andrew E. Mileski
1496  *      Written, tested, and released.
1497  */
1498 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1499 {
1500         int i;
1501         struct inode *inode=NULL;
1502         struct udf_options uopt;
1503         kernel_lb_addr rootdir, fileset;
1504         struct udf_sb_info *sbi;
1505
1506         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1507         uopt.uid = -1;
1508         uopt.gid = -1;
1509         uopt.umask = 0;
1510
1511         sbi = kmalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1512         if (!sbi)
1513                 return -ENOMEM;
1514         sb->s_fs_info = sbi;
1515         memset(UDF_SB(sb), 0x00, sizeof(struct udf_sb_info));
1516
1517         mutex_init(&sbi->s_alloc_mutex);
1518
1519         if (!udf_parse_options((char *)options, &uopt))
1520                 goto error_out;
1521
1522         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1523             uopt.flags & (1 << UDF_FLAG_NLS_MAP))
1524         {
1525                 udf_error(sb, "udf_read_super",
1526                         "utf8 cannot be combined with iocharset\n");
1527                 goto error_out;
1528         }
1529 #ifdef CONFIG_UDF_NLS
1530         if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map)
1531         {
1532                 uopt.nls_map = load_nls_default();
1533                 if (!uopt.nls_map)
1534                         uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1535                 else
1536                         udf_debug("Using default NLS map\n");
1537         }
1538 #endif
1539         if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1540                 uopt.flags |= (1 << UDF_FLAG_UTF8);
1541
1542         fileset.logicalBlockNum = 0xFFFFFFFF;
1543         fileset.partitionReferenceNum = 0xFFFF;
1544
1545         UDF_SB(sb)->s_flags = uopt.flags;
1546         UDF_SB(sb)->s_uid = uopt.uid;
1547         UDF_SB(sb)->s_gid = uopt.gid;
1548         UDF_SB(sb)->s_umask = uopt.umask;
1549         UDF_SB(sb)->s_nls_map = uopt.nls_map;
1550
1551         /* Set the block size for all transfers */
1552         if (!udf_set_blocksize(sb, uopt.blocksize))
1553                 goto error_out;
1554
1555         if ( uopt.session == 0xFFFFFFFF )
1556                 UDF_SB_SESSION(sb) = udf_get_last_session(sb);
1557         else
1558                 UDF_SB_SESSION(sb) = uopt.session;
1559
1560         udf_debug("Multi-session=%d\n", UDF_SB_SESSION(sb));
1561
1562         UDF_SB_LASTBLOCK(sb) = uopt.lastblock;
1563         UDF_SB_ANCHOR(sb)[0] = UDF_SB_ANCHOR(sb)[1] = 0;
1564         UDF_SB_ANCHOR(sb)[2] = uopt.anchor;
1565         UDF_SB_ANCHOR(sb)[3] = 256;
1566
1567         if (udf_check_valid(sb, uopt.novrs, silent)) /* read volume recognition sequences */
1568         {
1569                 printk("UDF-fs: No VRS found\n");
1570                 goto error_out;
1571         }
1572
1573         udf_find_anchor(sb);
1574
1575         /* Fill in the rest of the superblock */
1576         sb->s_op = &udf_sb_ops;
1577         sb->dq_op = NULL;
1578         sb->s_dirt = 0;
1579         sb->s_magic = UDF_SUPER_MAGIC;
1580         sb->s_time_gran = 1000;
1581
1582         if (udf_load_partition(sb, &fileset))
1583         {
1584                 printk("UDF-fs: No partition found (1)\n");
1585                 goto error_out;
1586         }
1587
1588         udf_debug("Lastblock=%d\n", UDF_SB_LASTBLOCK(sb));
1589
1590         if ( UDF_SB_LVIDBH(sb) )
1591         {
1592                 uint16_t minUDFReadRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev);
1593                 uint16_t minUDFWriteRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev);
1594                 /* uint16_t maxUDFWriteRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->maxUDFWriteRev); */
1595
1596                 if (minUDFReadRev > UDF_MAX_READ_VERSION)
1597                 {
1598                         printk("UDF-fs: minUDFReadRev=%x (max is %x)\n",
1599                                 le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev),
1600                                 UDF_MAX_READ_VERSION);
1601                         goto error_out;
1602                 }
1603                 else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
1604                 {
1605                         sb->s_flags |= MS_RDONLY;
1606                 }
1607
1608                 UDF_SB_UDFREV(sb) = minUDFWriteRev;
1609
1610                 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1611                         UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
1612                 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
1613                         UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
1614         }
1615
1616         if ( !UDF_SB_NUMPARTS(sb) )
1617         {
1618                 printk("UDF-fs: No partition found (2)\n");
1619                 goto error_out;
1620         }
1621
1622         if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_READ_ONLY) {
1623                 printk("UDF-fs: Partition marked readonly; forcing readonly mount\n");
1624                 sb->s_flags |= MS_RDONLY;
1625         }
1626
1627         if ( udf_find_fileset(sb, &fileset, &rootdir) )
1628         {
1629                 printk("UDF-fs: No fileset found\n");
1630                 goto error_out;
1631         }
1632
1633         if (!silent)
1634         {
1635                 kernel_timestamp ts;
1636                 udf_time_to_stamp(&ts, UDF_SB_RECORDTIME(sb));
1637                 udf_info("UDF %s (%s) Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
1638                         UDFFS_VERSION, UDFFS_DATE,
1639                         UDF_SB_VOLIDENT(sb), ts.year, ts.month, ts.day, ts.hour, ts.minute,
1640                         ts.typeAndTimezone);
1641         }
1642         if (!(sb->s_flags & MS_RDONLY))
1643                 udf_open_lvid(sb);
1644
1645         /* Assign the root inode */
1646         /* assign inodes by physical block number */
1647         /* perhaps it's not extensible enough, but for now ... */
1648         inode = udf_iget(sb, rootdir);
1649         if (!inode)
1650         {
1651                 printk("UDF-fs: Error in udf_iget, block=%d, partition=%d\n",
1652                         rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
1653                 goto error_out;
1654         }
1655
1656         /* Allocate a dentry for the root inode */
1657         sb->s_root = d_alloc_root(inode);
1658         if (!sb->s_root)
1659         {
1660                 printk("UDF-fs: Couldn't allocate root dentry\n");
1661                 iput(inode);
1662                 goto error_out;
1663         }
1664         sb->s_maxbytes = 1<<30;
1665         return 0;
1666
1667 error_out:
1668         if (UDF_SB_VAT(sb))
1669                 iput(UDF_SB_VAT(sb));
1670         if (UDF_SB_NUMPARTS(sb))
1671         {
1672                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1673                         iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1674                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1675                         iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1676                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1677                         UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_uspace);
1678                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1679                         UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_fspace);
1680                 if (UDF_SB_PARTTYPE(sb, UDF_SB_PARTITION(sb)) == UDF_SPARABLE_MAP15)
1681                 {
1682                         for (i=0; i<4; i++)
1683                                 udf_release_data(UDF_SB_TYPESPAR(sb, UDF_SB_PARTITION(sb)).s_spar_map[i]);
1684                 }
1685         }
1686 #ifdef CONFIG_UDF_NLS
1687         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1688                 unload_nls(UDF_SB(sb)->s_nls_map);
1689 #endif
1690         if (!(sb->s_flags & MS_RDONLY))
1691                 udf_close_lvid(sb);
1692         udf_release_data(UDF_SB_LVIDBH(sb));
1693         UDF_SB_FREE(sb);
1694         kfree(sbi);
1695         sb->s_fs_info = NULL;
1696         return -EINVAL;
1697 }
1698
1699 void udf_error(struct super_block *sb, const char *function,
1700         const char *fmt, ...)
1701 {
1702         va_list args;
1703
1704         if (!(sb->s_flags & MS_RDONLY))
1705         {
1706                 /* mark sb error */
1707                 sb->s_dirt = 1;
1708         }
1709         va_start(args, fmt);
1710         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1711         va_end(args);
1712         printk (KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
1713                 sb->s_id, function, error_buf);
1714 }
1715
1716 void udf_warning(struct super_block *sb, const char *function,
1717         const char *fmt, ...)
1718 {
1719         va_list args;
1720
1721         va_start (args, fmt);
1722         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1723         va_end(args);
1724         printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
1725                 sb->s_id, function, error_buf);
1726 }
1727
1728 /*
1729  * udf_put_super
1730  *
1731  * PURPOSE
1732  *      Prepare for destruction of the superblock.
1733  *
1734  * DESCRIPTION
1735  *      Called before the filesystem is unmounted.
1736  *
1737  * HISTORY
1738  *      July 1, 1997 - Andrew E. Mileski
1739  *      Written, tested, and released.
1740  */
1741 static void
1742 udf_put_super(struct super_block *sb)
1743 {
1744         int i;
1745
1746         if (UDF_SB_VAT(sb))
1747                 iput(UDF_SB_VAT(sb));
1748         if (UDF_SB_NUMPARTS(sb))
1749         {
1750                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1751                         iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1752                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1753                         iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1754                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1755                         UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_uspace);
1756                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1757                         UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_fspace);
1758                 if (UDF_SB_PARTTYPE(sb, UDF_SB_PARTITION(sb)) == UDF_SPARABLE_MAP15)
1759                 {
1760                         for (i=0; i<4; i++)
1761                                 udf_release_data(UDF_SB_TYPESPAR(sb, UDF_SB_PARTITION(sb)).s_spar_map[i]);
1762                 }
1763         }
1764 #ifdef CONFIG_UDF_NLS
1765         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1766                 unload_nls(UDF_SB(sb)->s_nls_map);
1767 #endif
1768         if (!(sb->s_flags & MS_RDONLY))
1769                 udf_close_lvid(sb);
1770         udf_release_data(UDF_SB_LVIDBH(sb));
1771         UDF_SB_FREE(sb);
1772         kfree(sb->s_fs_info);
1773         sb->s_fs_info = NULL;
1774 }
1775
1776 /*
1777  * udf_stat_fs
1778  *
1779  * PURPOSE
1780  *      Return info about the filesystem.
1781  *
1782  * DESCRIPTION
1783  *      Called by sys_statfs()
1784  *
1785  * HISTORY
1786  *      July 1, 1997 - Andrew E. Mileski
1787  *      Written, tested, and released.
1788  */
1789 static int
1790 udf_statfs(struct dentry *dentry, struct kstatfs *buf)
1791 {
1792         struct super_block *sb = dentry->d_sb;
1793
1794         buf->f_type = UDF_SUPER_MAGIC;
1795         buf->f_bsize = sb->s_blocksize;
1796         buf->f_blocks = UDF_SB_PARTLEN(sb, UDF_SB_PARTITION(sb));
1797         buf->f_bfree = udf_count_free(sb);
1798         buf->f_bavail = buf->f_bfree;
1799         buf->f_files = (UDF_SB_LVIDBH(sb) ?
1800                 (le32_to_cpu(UDF_SB_LVIDIU(sb)->numFiles) +
1801                 le32_to_cpu(UDF_SB_LVIDIU(sb)->numDirs)) : 0) + buf->f_bfree;
1802         buf->f_ffree = buf->f_bfree;
1803         /* __kernel_fsid_t f_fsid */
1804         buf->f_namelen = UDF_NAME_LEN-2;
1805
1806         return 0;
1807 }
1808
1809 static unsigned char udf_bitmap_lookup[16] = {
1810         0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4
1811 };
1812
1813 static unsigned int
1814 udf_count_free_bitmap(struct super_block *sb, struct udf_bitmap *bitmap)
1815 {
1816         struct buffer_head *bh = NULL;
1817         unsigned int accum = 0;
1818         int index;
1819         int block = 0, newblock;
1820         kernel_lb_addr loc;
1821         uint32_t bytes;
1822         uint8_t value;
1823         uint8_t *ptr;
1824         uint16_t ident;
1825         struct spaceBitmapDesc *bm;
1826
1827         lock_kernel();
1828
1829         loc.logicalBlockNum = bitmap->s_extPosition;
1830         loc.partitionReferenceNum = UDF_SB_PARTITION(sb);
1831         bh = udf_read_ptagged(sb, loc, 0, &ident);
1832
1833         if (!bh)
1834         {
1835                 printk(KERN_ERR "udf: udf_count_free failed\n");
1836                 goto out;
1837         }
1838         else if (ident != TAG_IDENT_SBD)
1839         {
1840                 udf_release_data(bh);
1841                 printk(KERN_ERR "udf: udf_count_free failed\n");
1842                 goto out;
1843         }
1844
1845         bm = (struct spaceBitmapDesc *)bh->b_data;
1846         bytes = le32_to_cpu(bm->numOfBytes);
1847         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
1848         ptr = (uint8_t *)bh->b_data;
1849
1850         while ( bytes > 0 )
1851         {
1852                 while ((bytes > 0) && (index < sb->s_blocksize))
1853                 {
1854                         value = ptr[index];
1855                         accum += udf_bitmap_lookup[ value & 0x0f ];
1856                         accum += udf_bitmap_lookup[ value >> 4 ];
1857                         index++;
1858                         bytes--;
1859                 }
1860                 if ( bytes )
1861                 {
1862                         udf_release_data(bh);
1863                         newblock = udf_get_lb_pblock(sb, loc, ++block);
1864                         bh = udf_tread(sb, newblock);
1865                         if (!bh)
1866                         {
1867                                 udf_debug("read failed\n");
1868                                 goto out;
1869                         }
1870                         index = 0;
1871                         ptr = (uint8_t *)bh->b_data;
1872                 }
1873         }
1874         udf_release_data(bh);
1875
1876 out:
1877         unlock_kernel();
1878
1879         return accum;
1880 }
1881
1882 static unsigned int
1883 udf_count_free_table(struct super_block *sb, struct inode * table)
1884 {
1885         unsigned int accum = 0;
1886         uint32_t extoffset, elen;
1887         kernel_lb_addr bloc, eloc;
1888         int8_t etype;
1889         struct buffer_head *bh = NULL;
1890
1891         lock_kernel();
1892
1893         bloc = UDF_I_LOCATION(table);
1894         extoffset = sizeof(struct unallocSpaceEntry);
1895
1896         while ((etype = udf_next_aext(table, &bloc, &extoffset, &eloc, &elen, &bh, 1)) != -1)
1897         {
1898                 accum += (elen >> table->i_sb->s_blocksize_bits);
1899         }
1900         udf_release_data(bh);
1901
1902         unlock_kernel();
1903
1904         return accum;
1905 }
1906
1907 static unsigned int
1908 udf_count_free(struct super_block *sb)
1909 {
1910         unsigned int accum = 0;
1911
1912         if (UDF_SB_LVIDBH(sb))
1913         {
1914                 if (le32_to_cpu(UDF_SB_LVID(sb)->numOfPartitions) > UDF_SB_PARTITION(sb))
1915                 {
1916                         accum = le32_to_cpu(UDF_SB_LVID(sb)->freeSpaceTable[UDF_SB_PARTITION(sb)]);
1917
1918                         if (accum == 0xFFFFFFFF)
1919                                 accum = 0;
1920                 }
1921         }
1922
1923         if (accum)
1924                 return accum;
1925
1926         if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1927         {
1928                 accum += udf_count_free_bitmap(sb,
1929                         UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_bitmap);
1930         }
1931         if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1932         {
1933                 accum += udf_count_free_bitmap(sb,
1934                         UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_bitmap);
1935         }
1936         if (accum)
1937                 return accum;
1938
1939         if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1940         {
1941                 accum += udf_count_free_table(sb,
1942                         UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1943         }
1944         if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1945         {
1946                 accum += udf_count_free_table(sb,
1947                         UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1948         }
1949
1950         return accum;
1951 }