fs/udf/super.c

   1 /*
   2  * super.c
   3  *
   4  * PURPOSE
   5  *  Super block routines for the OSTA-UDF(tm) filesystem.
   6  *
   7  * DESCRIPTION
   8  *  OSTA-UDF(tm) = Optical Storage Technology Association
   9  *  Universal Disk Format.
  10  *
  11  *  This code is based on version 2.00 of the UDF specification,
  12  *  and revision 3 of the ECMA 167 standard [equivalent to ISO 13346].
  13  *    http://www.osta.org/
  14  *    http://www.ecma.ch/
  15  *    http://www.iso.org/
  16  *
  17  * COPYRIGHT
  18  *  This file is distributed under the terms of the GNU General Public
  19  *  License (GPL). Copies of the GPL can be obtained from:
  20  *    ftp://prep.ai.mit.edu/pub/gnu/GPL
  21  *  Each contributing author retains all rights to their own work.
  22  *
  23  *  (C) 1998 Dave Boynton
  24  *  (C) 1998-2004 Ben Fennema
  25  *  (C) 2000 Stelias Computing Inc
  26  *
  27  * HISTORY
  28  *
  29  *  09/24/98 dgb  changed to allow compiling outside of kernel, and
  30  *                added some debugging.
  31  *  10/01/98 dgb  updated to allow (some) possibility of compiling w/2.0.34
  32  *  10/16/98      attempting some multi-session support
  33  *  10/17/98      added freespace count for "df"
  34  *  11/11/98 gr   added novrs option
  35  *  11/26/98 dgb  added fileset,anchor mount options
  36  *  12/06/98 blf  really hosed things royally. vat/sparing support. sequenced 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         return &ei->vfs_inode;
 119 }
 120
 121 static void udf_destroy_inode(struct inode *inode)
 122 {
 123         kmem_cache_free(udf_inode_cachep, UDF_I(inode));
 124 }
 125
 126 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
 127 {
 128         struct udf_inode_info *ei = (struct udf_inode_info *) foo;
 129
 130         if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
 131             SLAB_CTOR_CONSTRUCTOR)
 132         {
 133                 ei->i_ext.i_data = NULL;
 134                 inode_init_once(&ei->vfs_inode);
 135         }
 136 }
 137
 138 static int init_inodecache(void)
 139 {
 140         udf_inode_cachep = kmem_cache_create("udf_inode_cache",
 141                                              sizeof(struct udf_inode_info),
 142                                              0, (SLAB_RECLAIM_ACCOUNT|
 143                                                 SLAB_MEM_SPREAD),
 144                                              init_once, NULL);
 145         if (udf_inode_cachep == NULL)
 146                 return -ENOMEM;
 147         return 0;
 148 }
 149
 150 static void destroy_inodecache(void)
 151 {
 152         if (kmem_cache_destroy(udf_inode_cachep))
 153                 printk(KERN_INFO "udf_inode_cache: not all structures were freed\n");
 154 }
 155
 156 /* Superblock operations */
 157 static struct super_operations udf_sb_ops = {
 158         .alloc_inode            = udf_alloc_inode,
 159         .destroy_inode          = udf_destroy_inode,
 160         .write_inode            = udf_write_inode,
 161         .delete_inode           = udf_delete_inode,
 162         .clear_inode            = udf_clear_inode,
 163         .put_super              = udf_put_super,
 164         .write_super            = udf_write_super,
 165         .statfs                 = udf_statfs,
 166         .remount_fs             = udf_remount_fs,
 167 };
 168
 169 struct udf_options
 170 {
 171         unsigned char novrs;
 172         unsigned int blocksize;
 173         unsigned int session;
 174         unsigned int lastblock;
 175         unsigned int anchor;
 176         unsigned int volume;
 177         unsigned short partition;
 178         unsigned int fileset;
 179         unsigned int rootdir;
 180         unsigned int flags;
 181         mode_t umask;
 182         gid_t gid;
 183         uid_t uid;
 184         struct nls_table *nls_map;
 185 };
 186
 187 static int __init init_udf_fs(void)
 188 {
 189         int err;
 190         err = init_inodecache();
 191         if (err)
 192                 goto out1;
 193         err = register_filesystem(&udf_fstype);
 194         if (err)
 195                 goto out;
 196         return 0;
 197 out:
 198         destroy_inodecache();
 199 out1:
 200         return err;
 201 }
 202
 203 static void __exit exit_udf_fs(void)
 204 {
 205         unregister_filesystem(&udf_fstype);
 206         destroy_inodecache();
 207 }
 208
 209 module_init(init_udf_fs)
 210 module_exit(exit_udf_fs)
 211
 212 /*
 213  * udf_parse_options
 214  *
 215  * PURPOSE
 216  *      Parse mount options.
 217  *
 218  * DESCRIPTION
 219  *      The following mount options are supported:
 220  *
 221  *      gid=            Set the default group.
 222  *      umask=          Set the default umask.
 223  *      uid=            Set the default user.
 224  *      bs=             Set the block size.
 225  *      unhide          Show otherwise hidden files.
 226  *      undelete        Show deleted files in lists.
 227  *      adinicb         Embed data in the inode (default)
 228  *      noadinicb       Don't embed data in the inode
 229  *      shortad         Use short ad's
 230  *      longad          Use long ad's (default)
 231  *      nostrict        Unset strict conformance
 232  *      iocharset=      Set the NLS character set
 233  *
 234  *      The remaining are for debugging and disaster recovery:
 235  *
 236  *      novrs           Skip volume sequence recognition
 237  *
 238  *      The following expect a offset from 0.
 239  *
 240  *      session=        Set the CDROM session (default= last session)
 241  *      anchor=         Override standard anchor location. (default= 256)
 242  *      volume=         Override the VolumeDesc location. (unused)
 243  *      partition=      Override the PartitionDesc location. (unused)
 244  *      lastblock=      Set the last block of the filesystem/
 245  *
 246  *      The following expect a offset from the partition root.
 247  *
 248  *      fileset=        Override the fileset block location. (unused)
 249  *      rootdir=        Override the root directory location. (unused)
 250  *              WARNING: overriding the rootdir to a non-directory may
 251  *              yield highly unpredictable results.
 252  *
 253  * PRE-CONDITIONS
 254  *      options         Pointer to mount options string.
 255  *      uopts           Pointer to mount options variable.
 256  *
 257  * POST-CONDITIONS
 258  *      <return>        1       Mount options parsed okay.
 259  *      <return>        0       Error parsing mount options.
 260  *
 261  * HISTORY
 262  *      July 1, 1997 - Andrew E. Mileski
 263  *      Written, tested, and released.
 264  */
 265
 266 enum {
 267         Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
 268         Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
 269         Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
 270         Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
 271         Opt_rootdir, Opt_utf8, Opt_iocharset,
 272         Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore
 273 };
 274
 275 static match_table_t tokens = {
 276         {Opt_novrs, "novrs"},
 277         {Opt_nostrict, "nostrict"},
 278         {Opt_bs, "bs=%u"},
 279         {Opt_unhide, "unhide"},
 280         {Opt_undelete, "undelete"},
 281         {Opt_noadinicb, "noadinicb"},
 282         {Opt_adinicb, "adinicb"},
 283         {Opt_shortad, "shortad"},
 284         {Opt_longad, "longad"},
 285         {Opt_uforget, "uid=forget"},
 286         {Opt_uignore, "uid=ignore"},
 287         {Opt_gforget, "gid=forget"},
 288         {Opt_gignore, "gid=ignore"},
 289         {Opt_gid, "gid=%u"},
 290         {Opt_uid, "uid=%u"},
 291         {Opt_umask, "umask=%o"},
 292         {Opt_session, "session=%u"},
 293         {Opt_lastblock, "lastblock=%u"},
 294         {Opt_anchor, "anchor=%u"},
 295         {Opt_volume, "volume=%u"},
 296         {Opt_partition, "partition=%u"},
 297         {Opt_fileset, "fileset=%u"},
 298         {Opt_rootdir, "rootdir=%u"},
 299         {Opt_utf8, "utf8"},
 300         {Opt_iocharset, "iocharset=%s"},
 301         {Opt_err, NULL}
 302 };
 303
 304 static int
 305 udf_parse_options(char *options, struct udf_options *uopt)
 306 {
 307         char *p;
 308         int option;
 309
 310         uopt->novrs = 0;
 311         uopt->blocksize = 2048;
 312         uopt->partition = 0xFFFF;
 313         uopt->session = 0xFFFFFFFF;
 314         uopt->lastblock = 0;
 315         uopt->anchor = 0;
 316         uopt->volume = 0xFFFFFFFF;
 317         uopt->rootdir = 0xFFFFFFFF;
 318         uopt->fileset = 0xFFFFFFFF;
 319         uopt->nls_map = NULL;
 320
 321         if (!options)
 322                 return 1;
 323
 324         while ((p = strsep(&options, ",")) != NULL)
 325         {
 326                 substring_t args[MAX_OPT_ARGS];
 327                 int token;
 328                 if (!*p)
 329                         continue;
 330
 331                 token = match_token(p, tokens, args);
 332                 switch (token)
 333                 {
 334                         case Opt_novrs:
 335                                 uopt->novrs = 1;
 336                         case Opt_bs:
 337                                 if (match_int(&args[0], &option))
 338                                         return 0;
 339                                 uopt->blocksize = option;
 340                                 break;
 341                         case Opt_unhide:
 342                                 uopt->flags |= (1 << UDF_FLAG_UNHIDE);
 343                                 break;
 344                         case Opt_undelete:
 345                                 uopt->flags |= (1 << UDF_FLAG_UNDELETE);
 346                                 break;
 347                         case Opt_noadinicb:
 348                                 uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
 349                                 break;
 350                         case Opt_adinicb:
 351                                 uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
 352                                 break;
 353                         case Opt_shortad:
 354                                 uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
 355                                 break;
 356                         case Opt_longad:
 357                                 uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
 358                                 break;
 359                         case Opt_gid:
 360                                 if (match_int(args, &option))
 361                                         return 0;
 362                                 uopt->gid = option;
 363                                 break;
 364                         case Opt_uid:
 365                                 if (match_int(args, &option))
 366                                         return 0;
 367                                 uopt->uid = option;
 368                                 break;
 369                         case Opt_umask:
 370                                 if (match_octal(args, &option))
 371                                         return 0;
 372                                 uopt->umask = option;
 373                                 break;
 374                         case Opt_nostrict:
 375                                 uopt->flags &= ~(1 << UDF_FLAG_STRICT);
 376                                 break;
 377                         case Opt_session:
 378                                 if (match_int(args, &option))
 379                                         return 0;
 380                                 uopt->session = option;
 381                                 break;
 382                         case Opt_lastblock:
 383                                 if (match_int(args, &option))
 384                                         return 0;
 385                                 uopt->lastblock = option;
 386                                 break;
 387                         case Opt_anchor:
 388                                 if (match_int(args, &option))
 389                                         return 0;
 390                                 uopt->anchor = option;
 391                                 break;
 392                         case Opt_volume:
 393                                 if (match_int(args, &option))
 394                                         return 0;
 395                                 uopt->volume = option;
 396                                 break;
 397                         case Opt_partition:
 398                                 if (match_int(args, &option))
 399                                         return 0;
 400                                 uopt->partition = option;
 401                                 break;
 402                         case Opt_fileset:
 403                                 if (match_int(args, &option))
 404                                         return 0;
 405                                 uopt->fileset = option;
 406                                 break;
 407                         case Opt_rootdir:
 408                                 if (match_int(args, &option))
 409                                         return 0;
 410                                 uopt->rootdir = option;
 411                                 break;
 412                         case Opt_utf8:
 413                                 uopt->flags |= (1 << UDF_FLAG_UTF8);
 414                                 break;
 415 #ifdef CONFIG_UDF_NLS
 416                         case Opt_iocharset:
 417                                 uopt->nls_map = load_nls(args[0].from);
 418                                 uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
 419                                 break;
 420 #endif
 421                         case Opt_uignore:
 422                                 uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
 423                                 break;
 424                         case Opt_uforget:
 425                                 uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
 426                                 break;
 427                         case Opt_gignore:
 428                             uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
 429                                 break;
 430                         case Opt_gforget:
 431                             uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
 432                                 break;
 433                         default:
 434                                 printk(KERN_ERR "udf: bad mount option \"%s\" "
 435                                                 "or missing value\n", p);
 436                         return 0;
 437                 }
 438         }
 439         return 1;
 440 }
 441
 442 void
 443 udf_write_super(struct super_block *sb)
 444 {
 445         lock_kernel();
 446         if (!(sb->s_flags & MS_RDONLY))
 447                 udf_open_lvid(sb);
 448         sb->s_dirt = 0;
 449         unlock_kernel();
 450 }
 451
 452 static int
 453 udf_remount_fs(struct super_block *sb, int *flags, char *options)
 454 {
 455         struct udf_options uopt;
 456
 457         uopt.flags = UDF_SB(sb)->s_flags ;
 458         uopt.uid   = UDF_SB(sb)->s_uid ;
 459         uopt.gid   = UDF_SB(sb)->s_gid ;
 460         uopt.umask = UDF_SB(sb)->s_umask ;
 461
 462         if ( !udf_parse_options(options, &uopt) )
 463                 return -EINVAL;
 464
 465         UDF_SB(sb)->s_flags = uopt.flags;
 466         UDF_SB(sb)->s_uid   = uopt.uid;
 467         UDF_SB(sb)->s_gid   = uopt.gid;
 468         UDF_SB(sb)->s_umask = uopt.umask;
 469
 470         if (UDF_SB_LVIDBH(sb)) {
 471                 int write_rev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev);
 472                 if (write_rev > UDF_MAX_WRITE_VERSION)
 473                         *flags |= MS_RDONLY;
 474         }
 475
 476         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 477                 return 0;
 478         if (*flags & MS_RDONLY)
 479                 udf_close_lvid(sb);
 480         else
 481                 udf_open_lvid(sb);
 482
 483         return 0;
 484 }
 485
 486 /*
 487  * udf_set_blocksize
 488  *
 489  * PURPOSE
 490  *      Set the block size to be used in all transfers.
 491  *
 492  * DESCRIPTION
 493  *      To allow room for a DMA transfer, it is best to guess big when unsure.
 494  *      This routine picks 2048 bytes as the blocksize when guessing. This
 495  *      should be adequate until devices with larger block sizes become common.
 496  *
 497  *      Note that the Linux kernel can currently only deal with blocksizes of
 498  *      512, 1024, 2048, 4096, and 8192 bytes.
 499  *
 500  * PRE-CONDITIONS
 501  *      sb                      Pointer to _locked_ superblock.
 502  *
 503  * POST-CONDITIONS
 504  *      sb->s_blocksize         Blocksize.
 505  *      sb->s_blocksize_bits    log2 of blocksize.
 506  *      <return>        0       Blocksize is valid.
 507  *      <return>        1       Blocksize is invalid.
 508  *
 509  * HISTORY
 510  *      July 1, 1997 - Andrew E. Mileski
 511  *      Written, tested, and released.
 512  */
 513 static  int
 514 udf_set_blocksize(struct super_block *sb, int bsize)
 515 {
 516         if (!sb_min_blocksize(sb, bsize)) {
 517                 udf_debug("Bad block size (%d)\n", bsize);
 518                 printk(KERN_ERR "udf: bad block size (%d)\n", bsize);
 519                 return 0;
 520         }
 521         return sb->s_blocksize;
 522 }
 523
 524 static int
 525 udf_vrs(struct super_block *sb, int silent)
 526 {
 527         struct volStructDesc *vsd = NULL;
 528         int sector = 32768;
 529         int sectorsize;
 530         struct buffer_head *bh = NULL;
 531         int iso9660=0;
 532         int nsr02=0;
 533         int nsr03=0;
 534
 535         /* Block size must be a multiple of 512 */
 536         if (sb->s_blocksize & 511)
 537                 return 0;
 538
 539         if (sb->s_blocksize < sizeof(struct volStructDesc))
 540                 sectorsize = sizeof(struct volStructDesc);
 541         else
 542                 sectorsize = sb->s_blocksize;
 543
 544         sector += (UDF_SB_SESSION(sb) << sb->s_blocksize_bits);
 545
 546         udf_debug("Starting at sector %u (%ld byte sectors)\n",
 547                 (sector >> sb->s_blocksize_bits), sb->s_blocksize);
 548         /* Process the sequence (if applicable) */
 549         for (;!nsr02 && !nsr03; sector += sectorsize)
 550         {
 551                 /* Read a block */
 552                 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
 553                 if (!bh)
 554                         break;
 555
 556                 /* Look for ISO  descriptors */
 557                 vsd = (struct volStructDesc *)(bh->b_data +
 558                         (sector & (sb->s_blocksize - 1)));
 559
 560                 if (vsd->stdIdent[0] == 0)
 561                 {
 562                         udf_release_data(bh);
 563                         break;
 564                 }
 565                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001, VSD_STD_ID_LEN))
 566                 {
 567                         iso9660 = sector;
 568                         switch (vsd->structType)
 569                         {
 570                                 case 0:
 571                                         udf_debug("ISO9660 Boot Record found\n");
 572                                         break;
 573                                 case 1:
 574                                         udf_debug("ISO9660 Primary Volume Descriptor found\n");
 575                                         break;
 576                                 case 2:
 577                                         udf_debug("ISO9660 Supplementary Volume Descriptor found\n");
 578                                         break;
 579                                 case 3:
 580                                         udf_debug("ISO9660 Volume Partition Descriptor found\n");
 581                                         break;
 582                                 case 255:
 583                                         udf_debug("ISO9660 Volume Descriptor Set Terminator found\n");
 584                                         break;
 585                                 default:
 586                                         udf_debug("ISO9660 VRS (%u) found\n", vsd->structType);
 587                                         break;
 588                         }
 589                 }
 590                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01, VSD_STD_ID_LEN))
 591                 {
 592                 }
 593                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01, VSD_STD_ID_LEN))
 594                 {
 595                         udf_release_data(bh);
 596                         break;
 597                 }
 598                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02, VSD_STD_ID_LEN))
 599                 {
 600                         nsr02 = sector;
 601                 }
 602                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03, VSD_STD_ID_LEN))
 603                 {
 604                         nsr03 = sector;
 605                 }
 606                 udf_release_data(bh);
 607         }
 608
 609         if (nsr03)
 610                 return nsr03;
 611         else if (nsr02)
 612                 return nsr02;
 613         else if (sector - (UDF_SB_SESSION(sb) << sb->s_blocksize_bits) == 32768)
 614                 return -1;
 615         else
 616                 return 0;
 617 }
 618
 619 /*
 620  * udf_find_anchor
 621  *
 622  * PURPOSE
 623  *      Find an anchor volume descriptor.
 624  *
 625  * PRE-CONDITIONS
 626  *      sb                      Pointer to _locked_ superblock.
 627  *      lastblock               Last block on media.
 628  *
 629  * POST-CONDITIONS
 630  *      <return>                1 if not found, 0 if ok
 631  *
 632  * HISTORY
 633  *      July 1, 1997 - Andrew E. Mileski
 634  *      Written, tested, and released.
 635  */
 636 static void
 637 udf_find_anchor(struct super_block *sb)
 638 {
 639         int lastblock = UDF_SB_LASTBLOCK(sb);
 640         struct buffer_head *bh = NULL;
 641         uint16_t ident;
 642         uint32_t location;
 643         int i;
 644
 645         if (lastblock)
 646         {
 647                 int varlastblock = udf_variable_to_fixed(lastblock);
 648                 int last[] =  { lastblock, lastblock - 2,
 649                                 lastblock - 150, lastblock - 152,
 650                                 varlastblock, varlastblock - 2,
 651                                 varlastblock - 150, varlastblock - 152 };
 652
 653                 lastblock = 0;
 654
 655                 /* Search for an anchor volume descriptor pointer */
 656
 657                 /*  according to spec, anchor is in either:
 658                  *     block 256
 659                  *     lastblock-256
 660                  *     lastblock
 661                  *  however, if the disc isn't closed, it could be 512 */
 662
 663                 for (i = 0; !lastblock && i < ARRAY_SIZE(last); i++) {
 664                         if (last[i] < 0 || !(bh = sb_bread(sb, last[i])))
 665                         {
 666                                 ident = location = 0;
 667                         }
 668                         else
 669                         {
 670                                 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
 671                                 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
 672                                 udf_release_data(bh);
 673                         }
 674
 675                         if (ident == TAG_IDENT_AVDP)
 676                         {
 677                                 if (location == last[i] - UDF_SB_SESSION(sb))
 678                                 {
 679                                         lastblock = UDF_SB_ANCHOR(sb)[0] = last[i] - UDF_SB_SESSION(sb);
 680                                         UDF_SB_ANCHOR(sb)[1] = last[i] - 256 - UDF_SB_SESSION(sb);
 681                                 }
 682                                 else if (location == udf_variable_to_fixed(last[i]) - UDF_SB_SESSION(sb))
 683                                 {
 684                                         UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
 685                                         lastblock = UDF_SB_ANCHOR(sb)[0] = udf_variable_to_fixed(last[i]) - UDF_SB_SESSION(sb);
 686                                         UDF_SB_ANCHOR(sb)[1] = lastblock - 256 - UDF_SB_SESSION(sb);
 687                                 }
 688                                 else
 689                                         udf_debug("Anchor found at block %d, location mismatch %d.\n",
 690                                                 last[i], location);
 691                         }
 692                         else if (ident == TAG_IDENT_FE || ident == TAG_IDENT_EFE)
 693                         {
 694                                 lastblock = last[i];
 695                                 UDF_SB_ANCHOR(sb)[3] = 512;
 696                         }
 697                         else
 698                         {
 699                                 if (last[i] < 256 || !(bh = sb_bread(sb, last[i] - 256)))
 700                                 {
 701                                         ident = location = 0;
 702                                 }
 703                                 else
 704                                 {
 705                                         ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
 706                                         location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
 707                                         udf_release_data(bh);
 708                                 }
 709
 710                                 if (ident == TAG_IDENT_AVDP &&
 711                                         location == last[i] - 256 - UDF_SB_SESSION(sb))
 712                                 {
 713                                         lastblock = last[i];
 714                                         UDF_SB_ANCHOR(sb)[1] = last[i] - 256;
 715                                 }
 716                                 else
 717                                 {
 718                                         if (last[i] < 312 + UDF_SB_SESSION(sb) || !(bh = sb_bread(sb, last[i] - 312 - UDF_SB_SESSION(sb))))
 719                                         {
 720                                                 ident = location = 0;
 721                                         }
 722                                         else
 723                                         {
 724                                                 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
 725                                                 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
 726                                                 udf_release_data(bh);
 727                                         }
 728
 729                                         if (ident == TAG_IDENT_AVDP &&
 730                                                 location == udf_variable_to_fixed(last[i]) - 256)
 731                                         {
 732                                                 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
 733                                                 lastblock = udf_variable_to_fixed(last[i]);
 734                                                 UDF_SB_ANCHOR(sb)[1] = lastblock - 256;
 735                                         }
 736                                 }
 737                         }
 738                 }
 739         }
 740
 741         if (!lastblock)
 742         {
 743                 /* We havn't found the lastblock. check 312 */
 744                 if ((bh = sb_bread(sb, 312 + UDF_SB_SESSION(sb))))
 745                 {
 746                         ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
 747                         location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
 748                         udf_release_data(bh);
 749
 750                         if (ident == TAG_IDENT_AVDP && location == 256)
 751                                 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
 752                 }
 753         }
 754
 755         for (i = 0; i < ARRAY_SIZE(UDF_SB_ANCHOR(sb)); i++) {
 756                 if (UDF_SB_ANCHOR(sb)[i])
 757                 {
 758                         if (!(bh = udf_read_tagged(sb,
 759                                 UDF_SB_ANCHOR(sb)[i], UDF_SB_ANCHOR(sb)[i], &ident)))
 760                         {
 761                                 UDF_SB_ANCHOR(sb)[i] = 0;
 762                         }
 763                         else
 764                         {
 765                                 udf_release_data(bh);
 766                                 if ((ident != TAG_IDENT_AVDP) && (i ||
 767                                         (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE)))
 768                                 {
 769                                         UDF_SB_ANCHOR(sb)[i] = 0;
 770                                 }
 771                         }
 772                 }
 773         }
 774
 775         UDF_SB_LASTBLOCK(sb) = lastblock;
 776 }
 777
 778 static int
 779 udf_find_fileset(struct super_block *sb, kernel_lb_addr *fileset, kernel_lb_addr *root)
 780 {
 781         struct buffer_head *bh = NULL;
 782         long lastblock;
 783         uint16_t ident;
 784
 785         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
 786                 fileset->partitionReferenceNum != 0xFFFF)
 787         {
 788                 bh = udf_read_ptagged(sb, *fileset, 0, &ident);
 789
 790                 if (!bh)
 791                         return 1;
 792                 else if (ident != TAG_IDENT_FSD)
 793                 {
 794                         udf_release_data(bh);
 795                         return 1;
 796                 }
 797
 798         }
 799
 800         if (!bh) /* Search backwards through the partitions */
 801         {
 802                 kernel_lb_addr newfileset;
 803
 804                 return 1;
 805
 806                 for (newfileset.partitionReferenceNum=UDF_SB_NUMPARTS(sb)-1;
 807                         (newfileset.partitionReferenceNum != 0xFFFF &&
 808                                 fileset->logicalBlockNum == 0xFFFFFFFF &&
 809                                 fileset->partitionReferenceNum == 0xFFFF);
 810                         newfileset.partitionReferenceNum--)
 811                 {
 812                         lastblock = UDF_SB_PARTLEN(sb, newfileset.partitionReferenceNum);
 813                         newfileset.logicalBlockNum = 0;
 814
 815                         do
 816                         {
 817                                 bh = udf_read_ptagged(sb, newfileset, 0, &ident);
 818                                 if (!bh)
 819                                 {
 820                                         newfileset.logicalBlockNum ++;
 821                                         continue;
 822                                 }
 823
 824                                 switch (ident)
 825                                 {
 826                                         case TAG_IDENT_SBD:
 827                                         {
 828                                                 struct spaceBitmapDesc *sp;
 829                                                 sp = (struct spaceBitmapDesc *)bh->b_data;
 830                                                 newfileset.logicalBlockNum += 1 +
 831                                                         ((le32_to_cpu(sp->numOfBytes) + sizeof(struct spaceBitmapDesc) - 1)
 832                                                                 >> sb->s_blocksize_bits);
 833                                                 udf_release_data(bh);
 834                                                 break;
 835                                         }
 836                                         case TAG_IDENT_FSD:
 837                                         {
 838                                                 *fileset = newfileset;
 839                                                 break;
 840                                         }
 841                                         default:
 842                                         {
 843                                                 newfileset.logicalBlockNum ++;
 844                                                 udf_release_data(bh);
 845                                                 bh = NULL;
 846                                                 break;
 847                                         }
 848                                 }
 849                         }
 850                         while (newfileset.logicalBlockNum < lastblock &&
 851                                 fileset->logicalBlockNum == 0xFFFFFFFF &&
 852                                 fileset->partitionReferenceNum == 0xFFFF);
 853                 }
 854         }
 855
 856         if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
 857                 fileset->partitionReferenceNum != 0xFFFF) && bh)
 858         {
 859                 udf_debug("Fileset at block=%d, partition=%d\n",
 860                         fileset->logicalBlockNum, fileset->partitionReferenceNum);
 861
 862                 UDF_SB_PARTITION(sb) = fileset->partitionReferenceNum;
 863                 udf_load_fileset(sb, bh, root);
 864                 udf_release_data(bh);
 865                 return 0;
 866         }
 867         return 1;
 868 }
 869
 870 static void
 871 udf_load_pvoldesc(struct super_block *sb, struct buffer_head *bh)
 872 {
 873         struct primaryVolDesc *pvoldesc;
 874         time_t recording;
 875         long recording_usec;
 876         struct ustr instr;
 877         struct ustr outstr;
 878
 879         pvoldesc = (struct primaryVolDesc *)bh->b_data;
 880
 881         if ( udf_stamp_to_time(&recording, &recording_usec,
 882                 lets_to_cpu(pvoldesc->recordingDateAndTime)) )
 883         {
 884                 kernel_timestamp ts;
 885                 ts = lets_to_cpu(pvoldesc->recordingDateAndTime);
 886                 udf_debug("recording time %ld/%ld, %04u/%02u/%02u %02u:%02u (%x)\n",
 887                         recording, recording_usec,
 888                         ts.year, ts.month, ts.day, ts.hour, ts.minute, ts.typeAndTimezone);
 889                 UDF_SB_RECORDTIME(sb).tv_sec = recording;
 890                 UDF_SB_RECORDTIME(sb).tv_nsec = recording_usec * 1000;
 891         }
 892
 893         if ( !udf_build_ustr(&instr, pvoldesc->volIdent, 32) )
 894         {
 895                 if (udf_CS0toUTF8(&outstr, &instr))
 896                 {
 897                         strncpy( UDF_SB_VOLIDENT(sb), outstr.u_name,
 898                                 outstr.u_len > 31 ? 31 : outstr.u_len);
 899                         udf_debug("volIdent[] = '%s'\n", UDF_SB_VOLIDENT(sb));
 900                 }
 901         }
 902
 903         if ( !udf_build_ustr(&instr, pvoldesc->volSetIdent, 128) )
 904         {
 905                 if (udf_CS0toUTF8(&outstr, &instr))
 906                         udf_debug("volSetIdent[] = '%s'\n", outstr.u_name);
 907         }
 908 }
 909
 910 static void
 911 udf_load_fileset(struct super_block *sb, struct buffer_head *bh, kernel_lb_addr *root)
 912 {
 913         struct fileSetDesc *fset;
 914
 915         fset = (struct fileSetDesc *)bh->b_data;
 916
 917         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
 918
 919         UDF_SB_SERIALNUM(sb) = le16_to_cpu(fset->descTag.tagSerialNum);
 920
 921         udf_debug("Rootdir at block=%d, partition=%d\n",
 922                 root->logicalBlockNum, root->partitionReferenceNum);
 923 }
 924
 925 static void
 926 udf_load_partdesc(struct super_block *sb, struct buffer_head *bh)
 927 {
 928         struct partitionDesc *p;
 929         int i;
 930
 931         p = (struct partitionDesc *)bh->b_data;
 932
 933         for (i=0; i<UDF_SB_NUMPARTS(sb); i++)
 934         {
 935                 udf_debug("Searching map: (%d == %d)\n",
 936                         UDF_SB_PARTMAPS(sb)[i].s_partition_num, le16_to_cpu(p->partitionNumber));
 937                 if (UDF_SB_PARTMAPS(sb)[i].s_partition_num == le16_to_cpu(p->partitionNumber))
 938                 {
 939                         UDF_SB_PARTLEN(sb,i) = le32_to_cpu(p->partitionLength); /* blocks */
 940                         UDF_SB_PARTROOT(sb,i) = le32_to_cpu(p->partitionStartingLocation);
 941                         if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_READ_ONLY)
 942                                 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_READ_ONLY;
 943                         if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_WRITE_ONCE)
 944                                 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_WRITE_ONCE;
 945                         if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_REWRITABLE)
 946                                 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_REWRITABLE;
 947                         if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_OVERWRITABLE)
 948                                 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_OVERWRITABLE;
 949
 950                         if (!strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) ||
 951                                 !strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
 952                         {
 953                                 struct partitionHeaderDesc *phd;
 954
 955                                 phd = (struct partitionHeaderDesc *)(p->partitionContentsUse);
 956                                 if (phd->unallocSpaceTable.extLength)
 957                                 {
 958                                         kernel_lb_addr loc = { le32_to_cpu(phd->unallocSpaceTable.extPosition), i };
 959
 960                                         UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table =
 961                                                 udf_iget(sb, loc);
 962                                         UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_UNALLOC_TABLE;
 963                                         udf_debug("unallocSpaceTable (part %d) @ %ld\n",
 964                                                 i, UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table->i_ino);
 965                                 }
 966                                 if (phd->unallocSpaceBitmap.extLength)
 967                                 {
 968                                         UDF_SB_ALLOC_BITMAP(sb, i, s_uspace);
 969                                         if (UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap != NULL)
 970                                         {
 971                                                 UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extLength =
 972                                                         le32_to_cpu(phd->unallocSpaceBitmap.extLength);
 973                                                 UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extPosition =
 974                                                         le32_to_cpu(phd->unallocSpaceBitmap.extPosition);
 975                                                 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_UNALLOC_BITMAP;
 976                                                 udf_debug("unallocSpaceBitmap (part %d) @ %d\n",
 977                                                         i, UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extPosition);
 978                                         }
 979                                 }
 980                                 if (phd->partitionIntegrityTable.extLength)
 981                                         udf_debug("partitionIntegrityTable (part %d)\n", i);
 982                                 if (phd->freedSpaceTable.extLength)
 983                                 {
 984                                         kernel_lb_addr loc = { le32_to_cpu(phd->freedSpaceTable.extPosition), i };
 985
 986                                         UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table =
 987                                                 udf_iget(sb, loc);
 988                                         UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_FREED_TABLE;
 989                                         udf_debug("freedSpaceTable (part %d) @ %ld\n",
 990                                                 i, UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table->i_ino);
 991                                 }
 992                                 if (phd->freedSpaceBitmap.extLength)
 993                                 {
 994                                         UDF_SB_ALLOC_BITMAP(sb, i, s_fspace);
 995                                         if (UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap != NULL)
 996                                         {
 997                                                 UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extLength =
 998                                                         le32_to_cpu(phd->freedSpaceBitmap.extLength);
 999                                                 UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extPosition =
1000                                                         le32_to_cpu(phd->freedSpaceBitmap.extPosition);
1001                                                 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_FREED_BITMAP;
1002                                                 udf_debug("freedSpaceBitmap (part %d) @ %d\n",
1003                                                         i, UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extPosition);
1004                                         }
1005                                 }
1006                         }
1007                         break;
1008                 }
1009         }
1010         if (i == UDF_SB_NUMPARTS(sb))
1011         {
1012                 udf_debug("Partition (%d) not found in partition map\n", le16_to_cpu(p->partitionNumber));
1013         }
1014         else
1015         {
1016                 udf_debug("Partition (%d:%d type %x) starts at physical %d, block length %d\n",
1017                         le16_to_cpu(p->partitionNumber), i, UDF_SB_PARTTYPE(sb,i),
1018                         UDF_SB_PARTROOT(sb,i), UDF_SB_PARTLEN(sb,i));
1019         }
1020 }
1021
1022 static int
1023 udf_load_logicalvol(struct super_block *sb, struct buffer_head * bh, kernel_lb_addr *fileset)
1024 {
1025         struct logicalVolDesc *lvd;
1026         int i, j, offset;
1027         uint8_t type;
1028
1029         lvd = (struct logicalVolDesc *)bh->b_data;
1030
1031         UDF_SB_ALLOC_PARTMAPS(sb, le32_to_cpu(lvd->numPartitionMaps));
1032
1033         for (i=0,offset=0;
1034                  i<UDF_SB_NUMPARTS(sb) && offset<le32_to_cpu(lvd->mapTableLength);
1035                  i++,offset+=((struct genericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapLength)
1036         {
1037                 type = ((struct genericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapType;
1038                 if (type == 1)
1039                 {
1040                         struct genericPartitionMap1 *gpm1 = (struct genericPartitionMap1 *)&(lvd->partitionMaps[offset]);
1041                         UDF_SB_PARTTYPE(sb,i) = UDF_TYPE1_MAP15;
1042                         UDF_SB_PARTVSN(sb,i) = le16_to_cpu(gpm1->volSeqNum);
1043                         UDF_SB_PARTNUM(sb,i) = le16_to_cpu(gpm1->partitionNum);
1044                         UDF_SB_PARTFUNC(sb,i) = NULL;
1045                 }
1046                 else if (type == 2)
1047                 {
1048                         struct udfPartitionMap2 *upm2 = (struct udfPartitionMap2 *)&(lvd->partitionMaps[offset]);
1049                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL, strlen(UDF_ID_VIRTUAL)))
1050                         {
1051                                 if (le16_to_cpu(((__le16 *)upm2->partIdent.identSuffix)[0]) == 0x0150)
1052                                 {
1053                                         UDF_SB_PARTTYPE(sb,i) = UDF_VIRTUAL_MAP15;
1054                                         UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_virt15;
1055                                 }
1056                                 else if (le16_to_cpu(((__le16 *)upm2->partIdent.identSuffix)[0]) == 0x0200)
1057                                 {
1058                                         UDF_SB_PARTTYPE(sb,i) = UDF_VIRTUAL_MAP20;
1059                                         UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_virt20;
1060                                 }
1061                         }
1062                         else if (!strncmp(upm2->partIdent.ident, UDF_ID_SPARABLE, strlen(UDF_ID_SPARABLE)))
1063                         {
1064                                 uint32_t loc;
1065                                 uint16_t ident;
1066                                 struct sparingTable *st;
1067                                 struct sparablePartitionMap *spm = (struct sparablePartitionMap *)&(lvd->partitionMaps[offset]);
1068
1069                                 UDF_SB_PARTTYPE(sb,i) = UDF_SPARABLE_MAP15;
1070                                 UDF_SB_TYPESPAR(sb,i).s_packet_len = le16_to_cpu(spm->packetLength);
1071                                 for (j=0; j<spm->numSparingTables; j++)
1072                                 {
1073                                         loc = le32_to_cpu(spm->locSparingTable[j]);
1074                                         UDF_SB_TYPESPAR(sb,i).s_spar_map[j] =
1075                                                 udf_read_tagged(sb, loc, loc, &ident);
1076                                         if (UDF_SB_TYPESPAR(sb,i).s_spar_map[j] != NULL)
1077                                         {
1078                                                 st = (struct sparingTable *)UDF_SB_TYPESPAR(sb,i).s_spar_map[j]->b_data;
1079                                                 if (ident != 0 ||
1080                                                         strncmp(st->sparingIdent.ident, UDF_ID_SPARING, strlen(UDF_ID_SPARING)))
1081                                                 {
1082                                                         udf_release_data(UDF_SB_TYPESPAR(sb,i).s_spar_map[j]);
1083                                                         UDF_SB_TYPESPAR(sb,i).s_spar_map[j] = NULL;
1084                                                 }
1085                                         }
1086                                 }
1087                                 UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_spar15;
1088                         }
1089                         else
1090                         {
1091                                 udf_debug("Unknown ident: %s\n", upm2->partIdent.ident);
1092                                 continue;
1093                         }
1094                         UDF_SB_PARTVSN(sb,i) = le16_to_cpu(upm2->volSeqNum);
1095                         UDF_SB_PARTNUM(sb,i) = le16_to_cpu(upm2->partitionNum);
1096                 }
1097                 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1098                         i, UDF_SB_PARTNUM(sb,i), type, UDF_SB_PARTVSN(sb,i));
1099         }
1100
1101         if (fileset)
1102         {
1103                 long_ad *la = (long_ad *)&(lvd->logicalVolContentsUse[0]);
1104
1105                 *fileset = lelb_to_cpu(la->extLocation);
1106                 udf_debug("FileSet found in LogicalVolDesc at block=%d, partition=%d\n",
1107                         fileset->logicalBlockNum,
1108                         fileset->partitionReferenceNum);
1109         }
1110         if (lvd->integritySeqExt.extLength)
1111                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1112         return 0;
1113 }
1114
1115 /*
1116  * udf_load_logicalvolint
1117  *
1118  */
1119 static void
1120 udf_load_logicalvolint(struct super_block *sb, kernel_extent_ad loc)
1121 {
1122         struct buffer_head *bh = NULL;
1123         uint16_t ident;
1124
1125         while (loc.extLength > 0 &&
1126                 (bh = udf_read_tagged(sb, loc.extLocation,
1127                         loc.extLocation, &ident)) &&
1128                 ident == TAG_IDENT_LVID)
1129         {
1130                 UDF_SB_LVIDBH(sb) = bh;
1131
1132                 if (UDF_SB_LVID(sb)->nextIntegrityExt.extLength)
1133                         udf_load_logicalvolint(sb, leea_to_cpu(UDF_SB_LVID(sb)->nextIntegrityExt));
1134
1135                 if (UDF_SB_LVIDBH(sb) != bh)
1136                         udf_release_data(bh);
1137                 loc.extLength -= sb->s_blocksize;
1138                 loc.extLocation ++;
1139         }
1140         if (UDF_SB_LVIDBH(sb) != bh)
1141                 udf_release_data(bh);
1142 }
1143
1144 /*
1145  * udf_process_sequence
1146  *
1147  * PURPOSE
1148  *      Process a main/reserve volume descriptor sequence.
1149  *
1150  * PRE-CONDITIONS
1151  *      sb                      Pointer to _locked_ superblock.
1152  *      block                   First block of first extent of the sequence.
1153  *      lastblock               Lastblock of first extent of the sequence.
1154  *
1155  * HISTORY
1156  *      July 1, 1997 - Andrew E. Mileski
1157  *      Written, tested, and released.
1158  */
1159 static  int
1160 udf_process_sequence(struct super_block *sb, long block, long lastblock, kernel_lb_addr *fileset)
1161 {
1162         struct buffer_head *bh = NULL;
1163         struct udf_vds_record vds[VDS_POS_LENGTH];
1164         struct generic_desc *gd;
1165         struct volDescPtr *vdp;
1166         int done=0;
1167         int i,j;
1168         uint32_t vdsn;
1169         uint16_t ident;
1170         long next_s = 0, next_e = 0;
1171
1172         memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1173
1174         /* Read the main descriptor sequence */
1175         for (;(!done && block <= lastblock); block++)
1176         {
1177
1178                 bh = udf_read_tagged(sb, block, block, &ident);
1179                 if (!bh)
1180                         break;
1181
1182                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1183                 gd = (struct generic_desc *)bh->b_data;
1184                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1185                 switch (ident)
1186                 {
1187                         case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1188                                 if (vdsn >= vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum)
1189                                 {
1190                                         vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum = vdsn;
1191                                         vds[VDS_POS_PRIMARY_VOL_DESC].block = block;
1192                                 }
1193                                 break;
1194                         case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1195                                 if (vdsn >= vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum)
1196                                 {
1197                                         vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum = vdsn;
1198                                         vds[VDS_POS_VOL_DESC_PTR].block = block;
1199
1200                                         vdp = (struct volDescPtr *)bh->b_data;
1201                                         next_s = le32_to_cpu(vdp->nextVolDescSeqExt.extLocation);
1202                                         next_e = le32_to_cpu(vdp->nextVolDescSeqExt.extLength);
1203                                         next_e = next_e >> sb->s_blocksize_bits;
1204                                         next_e += next_s;
1205                                 }
1206                                 break;
1207                         case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1208                                 if (vdsn >= vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum)
1209                                 {
1210                                         vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum = vdsn;
1211                                         vds[VDS_POS_IMP_USE_VOL_DESC].block = block;
1212                                 }
1213                                 break;
1214                         case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1215                                 if (!vds[VDS_POS_PARTITION_DESC].block)
1216                                         vds[VDS_POS_PARTITION_DESC].block = block;
1217                                 break;
1218                         case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1219                                 if (vdsn >= vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum)
1220                                 {
1221                                         vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum = vdsn;
1222                                         vds[VDS_POS_LOGICAL_VOL_DESC].block = block;
1223                                 }
1224                                 break;
1225                         case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1226                                 if (vdsn >= vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum)
1227                                 {
1228                                         vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum = vdsn;
1229                                         vds[VDS_POS_UNALLOC_SPACE_DESC].block = block;
1230                                 }
1231                                 break;
1232                         case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1233                                 vds[VDS_POS_TERMINATING_DESC].block = block;
1234                                 if (next_e)
1235                                 {
1236                                         block = next_s;
1237                                         lastblock = next_e;
1238                                         next_s = next_e = 0;
1239                                 }
1240                                 else
1241                                         done = 1;
1242                                 break;
1243                 }
1244                 udf_release_data(bh);
1245         }
1246         for (i=0; i<VDS_POS_LENGTH; i++)
1247         {
1248                 if (vds[i].block)
1249                 {
1250                         bh = udf_read_tagged(sb, vds[i].block, vds[i].block, &ident);
1251
1252                         if (i == VDS_POS_PRIMARY_VOL_DESC)
1253                                 udf_load_pvoldesc(sb, bh);
1254                         else if (i == VDS_POS_LOGICAL_VOL_DESC)
1255                                 udf_load_logicalvol(sb, bh, fileset);
1256                         else if (i == VDS_POS_PARTITION_DESC)
1257                         {
1258                                 struct buffer_head *bh2 = NULL;
1259                                 udf_load_partdesc(sb, bh);
1260                                 for (j=vds[i].block+1; j<vds[VDS_POS_TERMINATING_DESC].block; j++)
1261                                 {
1262                                         bh2 = udf_read_tagged(sb, j, j, &ident);
1263                                         gd = (struct generic_desc *)bh2->b_data;
1264                                         if (ident == TAG_IDENT_PD)
1265                                                 udf_load_partdesc(sb, bh2);
1266                                         udf_release_data(bh2);
1267                                 }
1268                         }
1269                         udf_release_data(bh);
1270                 }
1271         }
1272
1273         return 0;
1274 }
1275
1276 /*
1277  * udf_check_valid()
1278  */
1279 static int
1280 udf_check_valid(struct super_block *sb, int novrs, int silent)
1281 {
1282         long block;
1283
1284         if (novrs)
1285         {
1286                 udf_debug("Validity check skipped because of novrs option\n");
1287                 return 0;
1288         }
1289         /* Check that it is NSR02 compliant */
1290         /* Process any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
1291         else if ((block = udf_vrs(sb, silent)) == -1)
1292         {
1293                 udf_debug("Failed to read byte 32768. Assuming open disc. Skipping validity check\n");
1294                 if (!UDF_SB_LASTBLOCK(sb))
1295                         UDF_SB_LASTBLOCK(sb) = udf_get_last_block(sb);
1296                 return 0;
1297         }
1298         else
1299                 return !block;
1300 }
1301
1302 static int
1303 udf_load_partition(struct super_block *sb, kernel_lb_addr *fileset)
1304 {
1305         struct anchorVolDescPtr *anchor;
1306         uint16_t ident;
1307         struct buffer_head *bh;
1308         long main_s, main_e, reserve_s, reserve_e;
1309         int i, j;
1310
1311         if (!sb)
1312                 return 1;
1313
1314         for (i = 0; i < ARRAY_SIZE(UDF_SB_ANCHOR(sb)); i++) {
1315                 if (UDF_SB_ANCHOR(sb)[i] && (bh = udf_read_tagged(sb,
1316                         UDF_SB_ANCHOR(sb)[i], UDF_SB_ANCHOR(sb)[i], &ident)))
1317                 {
1318                         anchor = (struct anchorVolDescPtr *)bh->b_data;
1319
1320                         /* Locate the main sequence */
1321                         main_s = le32_to_cpu( anchor->mainVolDescSeqExt.extLocation );
1322                         main_e = le32_to_cpu( anchor->mainVolDescSeqExt.extLength );
1323                         main_e = main_e >> sb->s_blocksize_bits;
1324                         main_e += main_s;
1325
1326                         /* Locate the reserve sequence */
1327                         reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1328                         reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1329                         reserve_e = reserve_e >> sb->s_blocksize_bits;
1330                         reserve_e += reserve_s;
1331
1332                         udf_release_data(bh);
1333
1334                         /* Process the main & reserve sequences */
1335                         /* responsible for finding the PartitionDesc(s) */
1336                         if (!(udf_process_sequence(sb, main_s, main_e, fileset) &&
1337                                 udf_process_sequence(sb, reserve_s, reserve_e, fileset)))
1338                         {
1339                                 break;
1340                         }
1341                 }
1342         }
1343
1344         if (i == ARRAY_SIZE(UDF_SB_ANCHOR(sb))) {
1345                 udf_debug("No Anchor block found\n");
1346                 return 1;
1347         } else
1348                 udf_debug("Using anchor in block %d\n", UDF_SB_ANCHOR(sb)[i]);
1349
1350         for (i=0; i<UDF_SB_NUMPARTS(sb); i++)
1351         {
1352                 switch UDF_SB_PARTTYPE(sb, i)
1353                 {
1354                         case UDF_VIRTUAL_MAP15:
1355                         case UDF_VIRTUAL_MAP20:
1356                         {
1357                                 kernel_lb_addr ino;
1358
1359                                 if (!UDF_SB_LASTBLOCK(sb))
1360                                 {
1361                                         UDF_SB_LASTBLOCK(sb) = udf_get_last_block(sb);
1362                                         udf_find_anchor(sb);
1363                                 }
1364
1365                                 if (!UDF_SB_LASTBLOCK(sb))
1366                                 {
1367                                         udf_debug("Unable to determine Lastblock (For Virtual Partition)\n");
1368                                         return 1;
1369                                 }
1370
1371                                 for (j=0; j<UDF_SB_NUMPARTS(sb); j++)
1372                                 {
1373                                         if (j != i &&
1374                                                 UDF_SB_PARTVSN(sb,i) == UDF_SB_PARTVSN(sb,j) &&
1375                                                 UDF_SB_PARTNUM(sb,i) == UDF_SB_PARTNUM(sb,j))
1376                                         {
1377                                                 ino.partitionReferenceNum = j;
1378                                                 ino.logicalBlockNum = UDF_SB_LASTBLOCK(sb) -
1379                                                         UDF_SB_PARTROOT(sb,j);
1380                                                 break;
1381                                         }
1382                                 }
1383
1384                                 if (j == UDF_SB_NUMPARTS(sb))
1385                                         return 1;
1386
1387                                 if (!(UDF_SB_VAT(sb) = udf_iget(sb, ino)))
1388                                         return 1;
1389
1390                                 if (UDF_SB_PARTTYPE(sb,i) == UDF_VIRTUAL_MAP15)
1391                                 {
1392                                         UDF_SB_TYPEVIRT(sb,i).s_start_offset = udf_ext0_offset(UDF_SB_VAT(sb));
1393                                         UDF_SB_TYPEVIRT(sb,i).s_num_entries = (UDF_SB_VAT(sb)->i_size - 36) >> 2;
1394                                 }
1395                                 else if (UDF_SB_PARTTYPE(sb,i) == UDF_VIRTUAL_MAP20)
1396                                 {
1397                                         struct buffer_head *bh = NULL;
1398                                         uint32_t pos;
1399
1400                                         pos = udf_block_map(UDF_SB_VAT(sb), 0);
1401                                         bh = sb_bread(sb, pos);
1402                                         UDF_SB_TYPEVIRT(sb,i).s_start_offset =
1403                                                 le16_to_cpu(((struct virtualAllocationTable20 *)bh->b_data + udf_ext0_offset(UDF_SB_VAT(sb)))->lengthHeader) +
1404                                                         udf_ext0_offset(UDF_SB_VAT(sb));
1405                                         UDF_SB_TYPEVIRT(sb,i).s_num_entries = (UDF_SB_VAT(sb)->i_size -
1406                                                 UDF_SB_TYPEVIRT(sb,i).s_start_offset) >> 2;
1407                                         udf_release_data(bh);
1408                                 }
1409                                 UDF_SB_PARTROOT(sb,i) = udf_get_pblock(sb, 0, i, 0);
1410                                 UDF_SB_PARTLEN(sb,i) = UDF_SB_PARTLEN(sb,ino.partitionReferenceNum);
1411                         }
1412                 }
1413         }
1414         return 0;
1415 }
1416
1417 static void udf_open_lvid(struct super_block *sb)
1418 {
1419         if (UDF_SB_LVIDBH(sb))
1420         {
1421                 int i;
1422                 kernel_timestamp cpu_time;
1423
1424                 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1425                 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1426                 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
1427                         UDF_SB_LVID(sb)->recordingDateAndTime = cpu_to_lets(cpu_time);
1428                 UDF_SB_LVID(sb)->integrityType = LVID_INTEGRITY_TYPE_OPEN;
1429
1430                 UDF_SB_LVID(sb)->descTag.descCRC =
1431                         cpu_to_le16(udf_crc((char *)UDF_SB_LVID(sb) + sizeof(tag),
1432                         le16_to_cpu(UDF_SB_LVID(sb)->descTag.descCRCLength), 0));
1433
1434                 UDF_SB_LVID(sb)->descTag.tagChecksum = 0;
1435                 for (i=0; i<16; i++)
1436                         if (i != 4)
1437                                 UDF_SB_LVID(sb)->descTag.tagChecksum +=
1438                                         ((uint8_t *)&(UDF_SB_LVID(sb)->descTag))[i];
1439
1440                 mark_buffer_dirty(UDF_SB_LVIDBH(sb));
1441         }
1442 }
1443
1444 static void udf_close_lvid(struct super_block *sb)
1445 {
1446         if (UDF_SB_LVIDBH(sb) &&
1447                 UDF_SB_LVID(sb)->integrityType == LVID_INTEGRITY_TYPE_OPEN)
1448         {
1449                 int i;
1450                 kernel_timestamp cpu_time;
1451
1452                 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1453                 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1454                 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
1455                         UDF_SB_LVID(sb)->recordingDateAndTime = cpu_to_lets(cpu_time);
1456                 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(UDF_SB_LVIDIU(sb)->maxUDFWriteRev))
1457                         UDF_SB_LVIDIU(sb)->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1458                 if (UDF_SB_UDFREV(sb) > le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev))
1459                         UDF_SB_LVIDIU(sb)->minUDFReadRev = cpu_to_le16(UDF_SB_UDFREV(sb));
1460                 if (UDF_SB_UDFREV(sb) > le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev))
1461                         UDF_SB_LVIDIU(sb)->minUDFWriteRev = cpu_to_le16(UDF_SB_UDFREV(sb));
1462                 UDF_SB_LVID(sb)->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1463
1464                 UDF_SB_LVID(sb)->descTag.descCRC =
1465                         cpu_to_le16(udf_crc((char *)UDF_SB_LVID(sb) + sizeof(tag),
1466                         le16_to_cpu(UDF_SB_LVID(sb)->descTag.descCRCLength), 0));
1467
1468                 UDF_SB_LVID(sb)->descTag.tagChecksum = 0;
1469                 for (i=0; i<16; i++)
1470                         if (i != 4)
1471                                 UDF_SB_LVID(sb)->descTag.tagChecksum +=
1472                                         ((uint8_t *)&(UDF_SB_LVID(sb)->descTag))[i];
1473
1474                 mark_buffer_dirty(UDF_SB_LVIDBH(sb));
1475         }
1476 }
1477
1478 /*
1479  * udf_read_super
1480  *
1481  * PURPOSE
1482  *      Complete the specified super block.
1483  *
1484  * PRE-CONDITIONS
1485  *      sb                      Pointer to superblock to complete - never NULL.
1486  *      sb->s_dev               Device to read suberblock from.
1487  *      options                 Pointer to mount options.
1488  *      silent                  Silent flag.
1489  *
1490  * HISTORY
1491  *      July 1, 1997 - Andrew E. Mileski
1492  *      Written, tested, and released.
1493  */
1494 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1495 {
1496         int i;
1497         struct inode *inode=NULL;
1498         struct udf_options uopt;
1499         kernel_lb_addr rootdir, fileset;
1500         struct udf_sb_info *sbi;
1501
1502         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1503         uopt.uid = -1;
1504         uopt.gid = -1;
1505         uopt.umask = 0;
1506
1507         sbi = kmalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1508         if (!sbi)
1509                 return -ENOMEM;
1510         sb->s_fs_info = sbi;
1511         memset(UDF_SB(sb), 0x00, sizeof(struct udf_sb_info));
1512
1513         mutex_init(&sbi->s_alloc_mutex);
1514
1515         if (!udf_parse_options((char *)options, &uopt))
1516                 goto error_out;
1517
1518         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1519             uopt.flags & (1 << UDF_FLAG_NLS_MAP))
1520         {
1521                 udf_error(sb, "udf_read_super",
1522                         "utf8 cannot be combined with iocharset\n");
1523                 goto error_out;
1524         }
1525 #ifdef CONFIG_UDF_NLS
1526         if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map)
1527         {
1528                 uopt.nls_map = load_nls_default();
1529                 if (!uopt.nls_map)
1530                         uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1531                 else
1532                         udf_debug("Using default NLS map\n");
1533         }
1534 #endif
1535         if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1536                 uopt.flags |= (1 << UDF_FLAG_UTF8);
1537
1538         fileset.logicalBlockNum = 0xFFFFFFFF;
1539         fileset.partitionReferenceNum = 0xFFFF;
1540
1541         UDF_SB(sb)->s_flags = uopt.flags;
1542         UDF_SB(sb)->s_uid = uopt.uid;
1543         UDF_SB(sb)->s_gid = uopt.gid;
1544         UDF_SB(sb)->s_umask = uopt.umask;
1545         UDF_SB(sb)->s_nls_map = uopt.nls_map;
1546
1547         /* Set the block size for all transfers */
1548         if (!udf_set_blocksize(sb, uopt.blocksize))
1549                 goto error_out;
1550
1551         if ( uopt.session == 0xFFFFFFFF )
1552                 UDF_SB_SESSION(sb) = udf_get_last_session(sb);
1553         else
1554                 UDF_SB_SESSION(sb) = uopt.session;
1555
1556         udf_debug("Multi-session=%d\n", UDF_SB_SESSION(sb));
1557
1558         UDF_SB_LASTBLOCK(sb) = uopt.lastblock;
1559         UDF_SB_ANCHOR(sb)[0] = UDF_SB_ANCHOR(sb)[1] = 0;
1560         UDF_SB_ANCHOR(sb)[2] = uopt.anchor;
1561         UDF_SB_ANCHOR(sb)[3] = 256;
1562
1563         if (udf_check_valid(sb, uopt.novrs, silent)) /* read volume recognition sequences */
1564         {
1565                 printk("UDF-fs: No VRS found\n");
1566                 goto error_out;
1567         }
1568
1569         udf_find_anchor(sb);
1570
1571         /* Fill in the rest of the superblock */
1572         sb->s_op = &udf_sb_ops;
1573         sb->dq_op = NULL;
1574         sb->s_dirt = 0;
1575         sb->s_magic = UDF_SUPER_MAGIC;
1576         sb->s_time_gran = 1000;
1577
1578         if (udf_load_partition(sb, &fileset))
1579         {
1580                 printk("UDF-fs: No partition found (1)\n");
1581                 goto error_out;
1582         }
1583
1584         udf_debug("Lastblock=%d\n", UDF_SB_LASTBLOCK(sb));
1585
1586         if ( UDF_SB_LVIDBH(sb) )
1587         {
1588                 uint16_t minUDFReadRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev);
1589                 uint16_t minUDFWriteRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev);
1590                 /* uint16_t maxUDFWriteRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->maxUDFWriteRev); */
1591
1592                 if (minUDFReadRev > UDF_MAX_READ_VERSION)
1593                 {
1594                         printk("UDF-fs: minUDFReadRev=%x (max is %x)\n",
1595                                 le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev),
1596                                 UDF_MAX_READ_VERSION);
1597                         goto error_out;
1598                 }
1599                 else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
1600                 {
1601                         sb->s_flags |= MS_RDONLY;
1602                 }
1603
1604                 UDF_SB_UDFREV(sb) = minUDFWriteRev;
1605
1606                 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1607                         UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
1608                 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
1609                         UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
1610         }
1611
1612         if ( !UDF_SB_NUMPARTS(sb) )
1613         {
1614                 printk("UDF-fs: No partition found (2)\n");
1615                 goto error_out;
1616         }
1617
1618         if ( udf_find_fileset(sb, &fileset, &rootdir) )
1619         {
1620                 printk("UDF-fs: No fileset found\n");
1621                 goto error_out;
1622         }
1623
1624         if (!silent)
1625         {
1626                 kernel_timestamp ts;
1627                 udf_time_to_stamp(&ts, UDF_SB_RECORDTIME(sb));
1628                 udf_info("UDF %s (%s) Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
1629                         UDFFS_VERSION, UDFFS_DATE,
1630                         UDF_SB_VOLIDENT(sb), ts.year, ts.month, ts.day, ts.hour, ts.minute,
1631                         ts.typeAndTimezone);
1632         }
1633         if (!(sb->s_flags & MS_RDONLY))
1634                 udf_open_lvid(sb);
1635
1636         /* Assign the root inode */
1637         /* assign inodes by physical block number */
1638         /* perhaps it's not extensible enough, but for now ... */
1639         inode = udf_iget(sb, rootdir);
1640         if (!inode)
1641         {
1642                 printk("UDF-fs: Error in udf_iget, block=%d, partition=%d\n",
1643                         rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
1644                 goto error_out;
1645         }
1646
1647         /* Allocate a dentry for the root inode */
1648         sb->s_root = d_alloc_root(inode);
1649         if (!sb->s_root)
1650         {
1651                 printk("UDF-fs: Couldn't allocate root dentry\n");
1652                 iput(inode);
1653                 goto error_out;
1654         }
1655         sb->s_maxbytes = MAX_LFS_FILESIZE;
1656         return 0;
1657
1658 error_out:
1659         if (UDF_SB_VAT(sb))
1660                 iput(UDF_SB_VAT(sb));
1661         if (UDF_SB_NUMPARTS(sb))
1662         {
1663                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1664                         iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1665                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1666                         iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1667                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1668                         UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_uspace);
1669                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1670                         UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_fspace);
1671                 if (UDF_SB_PARTTYPE(sb, UDF_SB_PARTITION(sb)) == UDF_SPARABLE_MAP15)
1672                 {
1673                         for (i=0; i<4; i++)
1674                                 udf_release_data(UDF_SB_TYPESPAR(sb, UDF_SB_PARTITION(sb)).s_spar_map[i]);
1675                 }
1676         }
1677 #ifdef CONFIG_UDF_NLS
1678         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1679                 unload_nls(UDF_SB(sb)->s_nls_map);
1680 #endif
1681         if (!(sb->s_flags & MS_RDONLY))
1682                 udf_close_lvid(sb);
1683         udf_release_data(UDF_SB_LVIDBH(sb));
1684         UDF_SB_FREE(sb);
1685         kfree(sbi);
1686         sb->s_fs_info = NULL;
1687         return -EINVAL;
1688 }
1689
1690 void udf_error(struct super_block *sb, const char *function,
1691         const char *fmt, ...)
1692 {
1693         va_list args;
1694
1695         if (!(sb->s_flags & MS_RDONLY))
1696         {
1697                 /* mark sb error */
1698                 sb->s_dirt = 1;
1699         }
1700         va_start(args, fmt);
1701         vsprintf(error_buf, fmt, args);
1702         va_end(args);
1703         printk (KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
1704                 sb->s_id, function, error_buf);
1705 }
1706
1707 void udf_warning(struct super_block *sb, const char *function,
1708         const char *fmt, ...)
1709 {
1710         va_list args;
1711
1712         va_start (args, fmt);
1713         vsprintf(error_buf, fmt, args);
1714         va_end(args);
1715         printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
1716                 sb->s_id, function, error_buf);
1717 }
1718
1719 /*
1720  * udf_put_super
1721  *
1722  * PURPOSE
1723  *      Prepare for destruction of the superblock.
1724  *
1725  * DESCRIPTION
1726  *      Called before the filesystem is unmounted.
1727  *
1728  * HISTORY
1729  *      July 1, 1997 - Andrew E. Mileski
1730  *      Written, tested, and released.
1731  */
1732 static void
1733 udf_put_super(struct super_block *sb)
1734 {
1735         int i;
1736
1737         if (UDF_SB_VAT(sb))
1738                 iput(UDF_SB_VAT(sb));
1739         if (UDF_SB_NUMPARTS(sb))
1740         {
1741                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1742                         iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1743                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1744                         iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1745                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1746                         UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_uspace);
1747                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1748                         UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_fspace);
1749                 if (UDF_SB_PARTTYPE(sb, UDF_SB_PARTITION(sb)) == UDF_SPARABLE_MAP15)
1750                 {
1751                         for (i=0; i<4; i++)
1752                                 udf_release_data(UDF_SB_TYPESPAR(sb, UDF_SB_PARTITION(sb)).s_spar_map[i]);
1753                 }
1754         }
1755 #ifdef CONFIG_UDF_NLS
1756         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1757                 unload_nls(UDF_SB(sb)->s_nls_map);
1758 #endif
1759         if (!(sb->s_flags & MS_RDONLY))
1760                 udf_close_lvid(sb);
1761         udf_release_data(UDF_SB_LVIDBH(sb));
1762         UDF_SB_FREE(sb);
1763         kfree(sb->s_fs_info);
1764         sb->s_fs_info = NULL;
1765 }
1766
1767 /*
1768  * udf_stat_fs
1769  *
1770  * PURPOSE
1771  *      Return info about the filesystem.
1772  *
1773  * DESCRIPTION
1774  *      Called by sys_statfs()
1775  *
1776  * HISTORY
1777  *      July 1, 1997 - Andrew E. Mileski
1778  *      Written, tested, and released.
1779  */
1780 static int
1781 udf_statfs(struct dentry *dentry, struct kstatfs *buf)
1782 {
1783         struct super_block *sb = dentry->d_sb;
1784
1785         buf->f_type = UDF_SUPER_MAGIC;
1786         buf->f_bsize = sb->s_blocksize;
1787         buf->f_blocks = UDF_SB_PARTLEN(sb, UDF_SB_PARTITION(sb));
1788         buf->f_bfree = udf_count_free(sb);
1789         buf->f_bavail = buf->f_bfree;
1790         buf->f_files = (UDF_SB_LVIDBH(sb) ?
1791                 (le32_to_cpu(UDF_SB_LVIDIU(sb)->numFiles) +
1792                 le32_to_cpu(UDF_SB_LVIDIU(sb)->numDirs)) : 0) + buf->f_bfree;
1793         buf->f_ffree = buf->f_bfree;
1794         /* __kernel_fsid_t f_fsid */
1795         buf->f_namelen = UDF_NAME_LEN-2;
1796
1797         return 0;
1798 }
1799
1800 static unsigned char udf_bitmap_lookup[16] = {
1801         0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4
1802 };
1803
1804 static unsigned int
1805 udf_count_free_bitmap(struct super_block *sb, struct udf_bitmap *bitmap)
1806 {
1807         struct buffer_head *bh = NULL;
1808         unsigned int accum = 0;
1809         int index;
1810         int block = 0, newblock;
1811         kernel_lb_addr loc;
1812         uint32_t bytes;
1813         uint8_t value;
1814         uint8_t *ptr;
1815         uint16_t ident;
1816         struct spaceBitmapDesc *bm;
1817
1818         lock_kernel();
1819
1820         loc.logicalBlockNum = bitmap->s_extPosition;
1821         loc.partitionReferenceNum = UDF_SB_PARTITION(sb);
1822         bh = udf_read_ptagged(sb, loc, 0, &ident);
1823
1824         if (!bh)
1825         {
1826                 printk(KERN_ERR "udf: udf_count_free failed\n");
1827                 goto out;
1828         }
1829         else if (ident != TAG_IDENT_SBD)
1830         {
1831                 udf_release_data(bh);
1832                 printk(KERN_ERR "udf: udf_count_free failed\n");
1833                 goto out;
1834         }
1835
1836         bm = (struct spaceBitmapDesc *)bh->b_data;
1837         bytes = le32_to_cpu(bm->numOfBytes);
1838         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
1839         ptr = (uint8_t *)bh->b_data;
1840
1841         while ( bytes > 0 )
1842         {
1843                 while ((bytes > 0) && (index < sb->s_blocksize))
1844                 {
1845                         value = ptr[index];
1846                         accum += udf_bitmap_lookup[ value & 0x0f ];
1847                         accum += udf_bitmap_lookup[ value >> 4 ];
1848                         index++;
1849                         bytes--;
1850                 }
1851                 if ( bytes )
1852                 {
1853                         udf_release_data(bh);
1854                         newblock = udf_get_lb_pblock(sb, loc, ++block);
1855                         bh = udf_tread(sb, newblock);
1856                         if (!bh)
1857                         {
1858                                 udf_debug("read failed\n");
1859                                 goto out;
1860                         }
1861                         index = 0;
1862                         ptr = (uint8_t *)bh->b_data;
1863                 }
1864         }
1865         udf_release_data(bh);
1866
1867 out:
1868         unlock_kernel();
1869
1870         return accum;
1871 }
1872
1873 static unsigned int
1874 udf_count_free_table(struct super_block *sb, struct inode * table)
1875 {
1876         unsigned int accum = 0;
1877         uint32_t extoffset, elen;
1878         kernel_lb_addr bloc, eloc;
1879         int8_t etype;
1880         struct buffer_head *bh = NULL;
1881
1882         lock_kernel();
1883
1884         bloc = UDF_I_LOCATION(table);
1885         extoffset = sizeof(struct unallocSpaceEntry);
1886
1887         while ((etype = udf_next_aext(table, &bloc, &extoffset, &eloc, &elen, &bh, 1)) != -1)
1888         {
1889                 accum += (elen >> table->i_sb->s_blocksize_bits);
1890         }
1891         udf_release_data(bh);
1892
1893         unlock_kernel();
1894
1895         return accum;
1896 }
1897
1898 static unsigned int
1899 udf_count_free(struct super_block *sb)
1900 {
1901         unsigned int accum = 0;
1902
1903         if (UDF_SB_LVIDBH(sb))
1904         {
1905                 if (le32_to_cpu(UDF_SB_LVID(sb)->numOfPartitions) > UDF_SB_PARTITION(sb))
1906                 {
1907                         accum = le32_to_cpu(UDF_SB_LVID(sb)->freeSpaceTable[UDF_SB_PARTITION(sb)]);
1908
1909                         if (accum == 0xFFFFFFFF)
1910                                 accum = 0;
1911                 }
1912         }
1913
1914         if (accum)
1915                 return accum;
1916
1917         if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1918         {
1919                 accum += udf_count_free_bitmap(sb,
1920                         UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_bitmap);
1921         }
1922         if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1923         {
1924                 accum += udf_count_free_bitmap(sb,
1925                         UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_bitmap);
1926         }
1927         if (accum)
1928                 return accum;
1929
1930         if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1931         {
1932                 accum += udf_count_free_table(sb,
1933                         UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1934         }
1935         if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1936         {
1937                 accum += udf_count_free_table(sb,
1938                         UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1939         }
1940
1941         return accum;
1942 }