fs/udf/super.c

   1 /*
   2  * super.c
   3  *
   4  * PURPOSE
   5  *  Super block routines for the OSTA-UDF(tm) filesystem.
   6  *
   7  * DESCRIPTION
   8  *  OSTA-UDF(tm) = Optical Storage Technology Association
   9  *  Universal Disk Format.
  10  *
  11  *  This code is based on version 2.00 of the UDF specification,
  12  *  and revision 3 of the ECMA 167 standard [equivalent to ISO 13346].
  13  *    http://www.osta.org/
  14  *    http://www.ecma.ch/
  15  *    http://www.iso.org/
  16  *
  17  * COPYRIGHT
  18  *  This file is distributed under the terms of the GNU General Public
  19  *  License (GPL). Copies of the GPL can be obtained from:
  20  *    ftp://prep.ai.mit.edu/pub/gnu/GPL
  21  *  Each contributing author retains all rights to their own work.
  22  *
  23  *  (C) 1998 Dave Boynton
  24  *  (C) 1998-2004 Ben Fennema
  25  *  (C) 2000 Stelias Computing Inc
  26  *
  27  * HISTORY
  28  *
  29  *  09/24/98 dgb  changed to allow compiling outside of kernel, and
  30  *                added some debugging.
  31  *  10/01/98 dgb  updated to allow (some) possibility of compiling w/2.0.34
  32  *  10/16/98      attempting some multi-session support
  33  *  10/17/98      added freespace count for "df"
  34  *  11/11/98 gr   added novrs option
  35  *  11/26/98 dgb  added fileset,anchor mount options
  36  *  12/06/98 blf  really hosed things royally. vat/sparing support. sequenced
  37  *                vol descs. rewrote option handling based on isofs
  38  *  12/20/98      find the free space bitmap (if it exists)
  39  */
  40
  41 #include "udfdecl.h"
  42
  43 #include <linux/blkdev.h>
  44 #include <linux/slab.h>
  45 #include <linux/kernel.h>
  46 #include <linux/module.h>
  47 #include <linux/parser.h>
  48 #include <linux/stat.h>
  49 #include <linux/cdrom.h>
  50 #include <linux/nls.h>
  51 #include <linux/smp_lock.h>
  52 #include <linux/buffer_head.h>
  53 #include <linux/vfs.h>
  54 #include <linux/vmalloc.h>
  55 #include <linux/errno.h>
  56 #include <asm/byteorder.h>
  57
  58 #include <linux/udf_fs.h>
  59 #include "udf_sb.h"
  60 #include "udf_i.h"
  61
  62 #include <linux/init.h>
  63 #include <asm/uaccess.h>
  64
  65 #define VDS_POS_PRIMARY_VOL_DESC        0
  66 #define VDS_POS_UNALLOC_SPACE_DESC      1
  67 #define VDS_POS_LOGICAL_VOL_DESC        2
  68 #define VDS_POS_PARTITION_DESC          3
  69 #define VDS_POS_IMP_USE_VOL_DESC        4
  70 #define VDS_POS_VOL_DESC_PTR            5
  71 #define VDS_POS_TERMINATING_DESC        6
  72 #define VDS_POS_LENGTH                  7
  73
  74 static char error_buf[1024];
  75
  76 /* These are the "meat" - everything else is stuffing */
  77 static int udf_fill_super(struct super_block *, void *, int);
  78 static void udf_put_super(struct super_block *);
  79 static void udf_write_super(struct super_block *);
  80 static int udf_remount_fs(struct super_block *, int *, char *);
  81 static int udf_check_valid(struct super_block *, int, int);
  82 static int udf_vrs(struct super_block *sb, int silent);
  83 static int udf_load_partition(struct super_block *, kernel_lb_addr *);
  84 static int udf_load_logicalvol(struct super_block *, struct buffer_head *,
  85                                kernel_lb_addr *);
  86 static void udf_load_logicalvolint(struct super_block *, kernel_extent_ad);
  87 static void udf_find_anchor(struct super_block *);
  88 static int udf_find_fileset(struct super_block *, kernel_lb_addr *,
  89                             kernel_lb_addr *);
  90 static void udf_load_pvoldesc(struct super_block *, struct buffer_head *);
  91 static void udf_load_fileset(struct super_block *, struct buffer_head *,
  92                              kernel_lb_addr *);
  93 static int udf_load_partdesc(struct super_block *, struct buffer_head *);
  94 static void udf_open_lvid(struct super_block *);
  95 static void udf_close_lvid(struct super_block *);
  96 static unsigned int udf_count_free(struct super_block *);
  97 static int udf_statfs(struct dentry *, struct kstatfs *);
  98
  99 struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct udf_sb_info *sbi)
 100 {
 101         struct logicalVolIntegrityDesc *lvid = (struct logicalVolIntegrityDesc *)sbi->s_lvid_bh->b_data;
 102         __u32 number_of_partitions = le32_to_cpu(lvid->numOfPartitions);
 103         __u32 offset = number_of_partitions * 2 * sizeof(uint32_t)/sizeof(uint8_t);
 104         return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
 105 }
 106
 107 /* UDF filesystem type */
 108 static int udf_get_sb(struct file_system_type *fs_type,
 109                       int flags, const char *dev_name, void *data,
 110                       struct vfsmount *mnt)
 111 {
 112         return get_sb_bdev(fs_type, flags, dev_name, data, udf_fill_super, mnt);
 113 }
 114
 115 static struct file_system_type udf_fstype = {
 116         .owner          = THIS_MODULE,
 117         .name           = "udf",
 118         .get_sb         = udf_get_sb,
 119         .kill_sb        = kill_block_super,
 120         .fs_flags       = FS_REQUIRES_DEV,
 121 };
 122
 123 static struct kmem_cache *udf_inode_cachep;
 124
 125 static struct inode *udf_alloc_inode(struct super_block *sb)
 126 {
 127         struct udf_inode_info *ei;
 128         ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
 129         if (!ei)
 130                 return NULL;
 131
 132         ei->i_unique = 0;
 133         ei->i_lenExtents = 0;
 134         ei->i_next_alloc_block = 0;
 135         ei->i_next_alloc_goal = 0;
 136         ei->i_strat4096 = 0;
 137
 138         return &ei->vfs_inode;
 139 }
 140
 141 static void udf_destroy_inode(struct inode *inode)
 142 {
 143         kmem_cache_free(udf_inode_cachep, UDF_I(inode));
 144 }
 145
 146 static void init_once(struct kmem_cache *cachep, void *foo)
 147 {
 148         struct udf_inode_info *ei = (struct udf_inode_info *)foo;
 149
 150         ei->i_ext.i_data = NULL;
 151         inode_init_once(&ei->vfs_inode);
 152 }
 153
 154 static int init_inodecache(void)
 155 {
 156         udf_inode_cachep = kmem_cache_create("udf_inode_cache",
 157                                              sizeof(struct udf_inode_info),
 158                                              0, (SLAB_RECLAIM_ACCOUNT |
 159                                                  SLAB_MEM_SPREAD),
 160                                              init_once);
 161         if (!udf_inode_cachep)
 162                 return -ENOMEM;
 163         return 0;
 164 }
 165
 166 static void destroy_inodecache(void)
 167 {
 168         kmem_cache_destroy(udf_inode_cachep);
 169 }
 170
 171 /* Superblock operations */
 172 static const struct super_operations udf_sb_ops = {
 173         .alloc_inode    = udf_alloc_inode,
 174         .destroy_inode  = udf_destroy_inode,
 175         .write_inode    = udf_write_inode,
 176         .delete_inode   = udf_delete_inode,
 177         .clear_inode    = udf_clear_inode,
 178         .put_super      = udf_put_super,
 179         .write_super    = udf_write_super,
 180         .statfs         = udf_statfs,
 181         .remount_fs     = udf_remount_fs,
 182 };
 183
 184 struct udf_options {
 185         unsigned char novrs;
 186         unsigned int blocksize;
 187         unsigned int session;
 188         unsigned int lastblock;
 189         unsigned int anchor;
 190         unsigned int volume;
 191         unsigned short partition;
 192         unsigned int fileset;
 193         unsigned int rootdir;
 194         unsigned int flags;
 195         mode_t umask;
 196         gid_t gid;
 197         uid_t uid;
 198         struct nls_table *nls_map;
 199 };
 200
 201 static int __init init_udf_fs(void)
 202 {
 203         int err;
 204
 205         err = init_inodecache();
 206         if (err)
 207                 goto out1;
 208         err = register_filesystem(&udf_fstype);
 209         if (err)
 210                 goto out;
 211
 212         return 0;
 213
 214 out:
 215         destroy_inodecache();
 216
 217 out1:
 218         return err;
 219 }
 220
 221 static void __exit exit_udf_fs(void)
 222 {
 223         unregister_filesystem(&udf_fstype);
 224         destroy_inodecache();
 225 }
 226
 227 module_init(init_udf_fs)
 228 module_exit(exit_udf_fs)
 229
 230 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
 231 {
 232         struct udf_sb_info *sbi = UDF_SB(sb);
 233
 234         sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map),
 235                                   GFP_KERNEL);
 236         if (!sbi->s_partmaps) {
 237                 udf_error(sb, __FUNCTION__,
 238                           "Unable to allocate space for %d partition maps",
 239                           count);
 240                 sbi->s_partitions = 0;
 241                 return -ENOMEM;
 242         }
 243
 244         sbi->s_partitions = count;
 245         return 0;
 246 }
 247
 248 /*
 249  * udf_parse_options
 250  *
 251  * PURPOSE
 252  *      Parse mount options.
 253  *
 254  * DESCRIPTION
 255  *      The following mount options are supported:
 256  *
 257  *      gid=            Set the default group.
 258  *      umask=          Set the default umask.
 259  *      uid=            Set the default user.
 260  *      bs=             Set the block size.
 261  *      unhide          Show otherwise hidden files.
 262  *      undelete        Show deleted files in lists.
 263  *      adinicb         Embed data in the inode (default)
 264  *      noadinicb       Don't embed data in the inode
 265  *      shortad         Use short ad's
 266  *      longad          Use long ad's (default)
 267  *      nostrict        Unset strict conformance
 268  *      iocharset=      Set the NLS character set
 269  *
 270  *      The remaining are for debugging and disaster recovery:
 271  *
 272  *      novrs           Skip volume sequence recognition
 273  *
 274  *      The following expect a offset from 0.
 275  *
 276  *      session=        Set the CDROM session (default= last session)
 277  *      anchor=         Override standard anchor location. (default= 256)
 278  *      volume=         Override the VolumeDesc location. (unused)
 279  *      partition=      Override the PartitionDesc location. (unused)
 280  *      lastblock=      Set the last block of the filesystem/
 281  *
 282  *      The following expect a offset from the partition root.
 283  *
 284  *      fileset=        Override the fileset block location. (unused)
 285  *      rootdir=        Override the root directory location. (unused)
 286  *              WARNING: overriding the rootdir to a non-directory may
 287  *              yield highly unpredictable results.
 288  *
 289  * PRE-CONDITIONS
 290  *      options         Pointer to mount options string.
 291  *      uopts           Pointer to mount options variable.
 292  *
 293  * POST-CONDITIONS
 294  *      <return>        1       Mount options parsed okay.
 295  *      <return>        0       Error parsing mount options.
 296  *
 297  * HISTORY
 298  *      July 1, 1997 - Andrew E. Mileski
 299  *      Written, tested, and released.
 300  */
 301
 302 enum {
 303         Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
 304         Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
 305         Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
 306         Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
 307         Opt_rootdir, Opt_utf8, Opt_iocharset,
 308         Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore
 309 };
 310
 311 static match_table_t tokens = {
 312         {Opt_novrs,     "novrs"},
 313         {Opt_nostrict,  "nostrict"},
 314         {Opt_bs,        "bs=%u"},
 315         {Opt_unhide,    "unhide"},
 316         {Opt_undelete,  "undelete"},
 317         {Opt_noadinicb, "noadinicb"},
 318         {Opt_adinicb,   "adinicb"},
 319         {Opt_shortad,   "shortad"},
 320         {Opt_longad,    "longad"},
 321         {Opt_uforget,   "uid=forget"},
 322         {Opt_uignore,   "uid=ignore"},
 323         {Opt_gforget,   "gid=forget"},
 324         {Opt_gignore,   "gid=ignore"},
 325         {Opt_gid,       "gid=%u"},
 326         {Opt_uid,       "uid=%u"},
 327         {Opt_umask,     "umask=%o"},
 328         {Opt_session,   "session=%u"},
 329         {Opt_lastblock, "lastblock=%u"},
 330         {Opt_anchor,    "anchor=%u"},
 331         {Opt_volume,    "volume=%u"},
 332         {Opt_partition, "partition=%u"},
 333         {Opt_fileset,   "fileset=%u"},
 334         {Opt_rootdir,   "rootdir=%u"},
 335         {Opt_utf8,      "utf8"},
 336         {Opt_iocharset, "iocharset=%s"},
 337         {Opt_err,       NULL}
 338 };
 339
 340 static int udf_parse_options(char *options, struct udf_options *uopt)
 341 {
 342         char *p;
 343         int option;
 344
 345         uopt->novrs = 0;
 346         uopt->blocksize = 2048;
 347         uopt->partition = 0xFFFF;
 348         uopt->session = 0xFFFFFFFF;
 349         uopt->lastblock = 0;
 350         uopt->anchor = 0;
 351         uopt->volume = 0xFFFFFFFF;
 352         uopt->rootdir = 0xFFFFFFFF;
 353         uopt->fileset = 0xFFFFFFFF;
 354         uopt->nls_map = NULL;
 355
 356         if (!options)
 357                 return 1;
 358
 359         while ((p = strsep(&options, ",")) != NULL) {
 360                 substring_t args[MAX_OPT_ARGS];
 361                 int token;
 362                 if (!*p)
 363                         continue;
 364
 365                 token = match_token(p, tokens, args);
 366                 switch (token) {
 367                 case Opt_novrs:
 368                         uopt->novrs = 1;
 369                 case Opt_bs:
 370                         if (match_int(&args[0], &option))
 371                                 return 0;
 372                         uopt->blocksize = option;
 373                         break;
 374                 case Opt_unhide:
 375                         uopt->flags |= (1 << UDF_FLAG_UNHIDE);
 376                         break;
 377                 case Opt_undelete:
 378                         uopt->flags |= (1 << UDF_FLAG_UNDELETE);
 379                         break;
 380                 case Opt_noadinicb:
 381                         uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
 382                         break;
 383                 case Opt_adinicb:
 384                         uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
 385                         break;
 386                 case Opt_shortad:
 387                         uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
 388                         break;
 389                 case Opt_longad:
 390                         uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
 391                         break;
 392                 case Opt_gid:
 393                         if (match_int(args, &option))
 394                                 return 0;
 395                         uopt->gid = option;
 396                         uopt->flags |= (1 << UDF_FLAG_GID_SET);
 397                         break;
 398                 case Opt_uid:
 399                         if (match_int(args, &option))
 400                                 return 0;
 401                         uopt->uid = option;
 402                         uopt->flags |= (1 << UDF_FLAG_UID_SET);
 403                         break;
 404                 case Opt_umask:
 405                         if (match_octal(args, &option))
 406                                 return 0;
 407                         uopt->umask = option;
 408                         break;
 409                 case Opt_nostrict:
 410                         uopt->flags &= ~(1 << UDF_FLAG_STRICT);
 411                         break;
 412                 case Opt_session:
 413                         if (match_int(args, &option))
 414                                 return 0;
 415                         uopt->session = option;
 416                         break;
 417                 case Opt_lastblock:
 418                         if (match_int(args, &option))
 419                                 return 0;
 420                         uopt->lastblock = option;
 421                         break;
 422                 case Opt_anchor:
 423                         if (match_int(args, &option))
 424                                 return 0;
 425                         uopt->anchor = option;
 426                         break;
 427                 case Opt_volume:
 428                         if (match_int(args, &option))
 429                                 return 0;
 430                         uopt->volume = option;
 431                         break;
 432                 case Opt_partition:
 433                         if (match_int(args, &option))
 434                                 return 0;
 435                         uopt->partition = option;
 436                         break;
 437                 case Opt_fileset:
 438                         if (match_int(args, &option))
 439                                 return 0;
 440                         uopt->fileset = option;
 441                         break;
 442                 case Opt_rootdir:
 443                         if (match_int(args, &option))
 444                                 return 0;
 445                         uopt->rootdir = option;
 446                         break;
 447                 case Opt_utf8:
 448                         uopt->flags |= (1 << UDF_FLAG_UTF8);
 449                         break;
 450 #ifdef CONFIG_UDF_NLS
 451                 case Opt_iocharset:
 452                         uopt->nls_map = load_nls(args[0].from);
 453                         uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
 454                         break;
 455 #endif
 456                 case Opt_uignore:
 457                         uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
 458                         break;
 459                 case Opt_uforget:
 460                         uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
 461                         break;
 462                 case Opt_gignore:
 463                         uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
 464                         break;
 465                 case Opt_gforget:
 466                         uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
 467                         break;
 468                 default:
 469                         printk(KERN_ERR "udf: bad mount option \"%s\" "
 470                                "or missing value\n", p);
 471                         return 0;
 472                 }
 473         }
 474         return 1;
 475 }
 476
 477 void udf_write_super(struct super_block *sb)
 478 {
 479         lock_kernel();
 480
 481         if (!(sb->s_flags & MS_RDONLY))
 482                 udf_open_lvid(sb);
 483         sb->s_dirt = 0;
 484
 485         unlock_kernel();
 486 }
 487
 488 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
 489 {
 490         struct udf_options uopt;
 491         struct udf_sb_info *sbi = UDF_SB(sb);
 492
 493         uopt.flags = sbi->s_flags;
 494         uopt.uid   = sbi->s_uid;
 495         uopt.gid   = sbi->s_gid;
 496         uopt.umask = sbi->s_umask;
 497
 498         if (!udf_parse_options(options, &uopt))
 499                 return -EINVAL;
 500
 501         sbi->s_flags = uopt.flags;
 502         sbi->s_uid   = uopt.uid;
 503         sbi->s_gid   = uopt.gid;
 504         sbi->s_umask = uopt.umask;
 505
 506         if (sbi->s_lvid_bh) {
 507                 int write_rev = le16_to_cpu(udf_sb_lvidiu(sbi)->minUDFWriteRev);
 508                 if (write_rev > UDF_MAX_WRITE_VERSION)
 509                         *flags |= MS_RDONLY;
 510         }
 511
 512         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 513                 return 0;
 514         if (*flags & MS_RDONLY)
 515                 udf_close_lvid(sb);
 516         else
 517                 udf_open_lvid(sb);
 518
 519         return 0;
 520 }
 521
 522 /*
 523  * udf_set_blocksize
 524  *
 525  * PURPOSE
 526  *      Set the block size to be used in all transfers.
 527  *
 528  * DESCRIPTION
 529  *      To allow room for a DMA transfer, it is best to guess big when unsure.
 530  *      This routine picks 2048 bytes as the blocksize when guessing. This
 531  *      should be adequate until devices with larger block sizes become common.
 532  *
 533  *      Note that the Linux kernel can currently only deal with blocksizes of
 534  *      512, 1024, 2048, 4096, and 8192 bytes.
 535  *
 536  * PRE-CONDITIONS
 537  *      sb                      Pointer to _locked_ superblock.
 538  *
 539  * POST-CONDITIONS
 540  *      sb->s_blocksize         Blocksize.
 541  *      sb->s_blocksize_bits    log2 of blocksize.
 542  *      <return>        0       Blocksize is valid.
 543  *      <return>        1       Blocksize is invalid.
 544  *
 545  * HISTORY
 546  *      July 1, 1997 - Andrew E. Mileski
 547  *      Written, tested, and released.
 548  */
 549 static int udf_set_blocksize(struct super_block *sb, int bsize)
 550 {
 551         if (!sb_min_blocksize(sb, bsize)) {
 552                 udf_debug("Bad block size (%d)\n", bsize);
 553                 printk(KERN_ERR "udf: bad block size (%d)\n", bsize);
 554                 return 0;
 555         }
 556
 557         return sb->s_blocksize;
 558 }
 559
 560 static int udf_vrs(struct super_block *sb, int silent)
 561 {
 562         struct volStructDesc *vsd = NULL;
 563         int sector = 32768;
 564         int sectorsize;
 565         struct buffer_head *bh = NULL;
 566         int iso9660 = 0;
 567         int nsr02 = 0;
 568         int nsr03 = 0;
 569         struct udf_sb_info *sbi;
 570
 571         /* Block size must be a multiple of 512 */
 572         if (sb->s_blocksize & 511)
 573                 return 0;
 574         sbi = UDF_SB(sb);
 575
 576         if (sb->s_blocksize < sizeof(struct volStructDesc))
 577                 sectorsize = sizeof(struct volStructDesc);
 578         else
 579                 sectorsize = sb->s_blocksize;
 580
 581         sector += (sbi->s_session << sb->s_blocksize_bits);
 582
 583         udf_debug("Starting at sector %u (%ld byte sectors)\n",
 584                   (sector >> sb->s_blocksize_bits), sb->s_blocksize);
 585         /* Process the sequence (if applicable) */
 586         for (; !nsr02 && !nsr03; sector += sectorsize) {
 587                 /* Read a block */
 588                 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
 589                 if (!bh)
 590                         break;
 591
 592                 /* Look for ISO  descriptors */
 593                 vsd = (struct volStructDesc *)(bh->b_data +
 594                                               (sector & (sb->s_blocksize - 1)));
 595
 596                 if (vsd->stdIdent[0] == 0) {
 597                         brelse(bh);
 598                         break;
 599                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
 600                                     VSD_STD_ID_LEN)) {
 601                         iso9660 = sector;
 602                         switch (vsd->structType) {
 603                         case 0:
 604                                 udf_debug("ISO9660 Boot Record found\n");
 605                                 break;
 606                         case 1:
 607                                 udf_debug("ISO9660 Primary Volume Descriptor "
 608                                           "found\n");
 609                                 break;
 610                         case 2:
 611                                 udf_debug("ISO9660 Supplementary Volume "
 612                                           "Descriptor found\n");
 613                                 break;
 614                         case 3:
 615                                 udf_debug("ISO9660 Volume Partition Descriptor "
 616                                           "found\n");
 617                                 break;
 618                         case 255:
 619                                 udf_debug("ISO9660 Volume Descriptor Set "
 620                                           "Terminator found\n");
 621                                 break;
 622                         default:
 623                                 udf_debug("ISO9660 VRS (%u) found\n",
 624                                           vsd->structType);
 625                                 break;
 626                         }
 627                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
 628                                     VSD_STD_ID_LEN))
 629                         ; /* nothing */
 630                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
 631                                     VSD_STD_ID_LEN)) {
 632                         brelse(bh);
 633                         break;
 634                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
 635                                     VSD_STD_ID_LEN))
 636                         nsr02 = sector;
 637                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
 638                                     VSD_STD_ID_LEN))
 639                         nsr03 = sector;
 640                 brelse(bh);
 641         }
 642
 643         if (nsr03)
 644                 return nsr03;
 645         else if (nsr02)
 646                 return nsr02;
 647         else if (sector - (sbi->s_session << sb->s_blocksize_bits) == 32768)
 648                 return -1;
 649         else
 650                 return 0;
 651 }
 652
 653 /*
 654  * udf_find_anchor
 655  *
 656  * PURPOSE
 657  *      Find an anchor volume descriptor.
 658  *
 659  * PRE-CONDITIONS
 660  *      sb                      Pointer to _locked_ superblock.
 661  *      lastblock               Last block on media.
 662  *
 663  * POST-CONDITIONS
 664  *      <return>                1 if not found, 0 if ok
 665  *
 666  * HISTORY
 667  *      July 1, 1997 - Andrew E. Mileski
 668  *      Written, tested, and released.
 669  */
 670 static void udf_find_anchor(struct super_block *sb)
 671 {
 672         int lastblock;
 673         struct buffer_head *bh = NULL;
 674         uint16_t ident;
 675         uint32_t location;
 676         int i;
 677         struct udf_sb_info *sbi;
 678
 679         sbi = UDF_SB(sb);
 680         lastblock = sbi->s_last_block;
 681
 682         if (lastblock) {
 683                 int varlastblock = udf_variable_to_fixed(lastblock);
 684                 int last[] =  { lastblock, lastblock - 2,
 685                                 lastblock - 150, lastblock - 152,
 686                                 varlastblock, varlastblock - 2,
 687                                 varlastblock - 150, varlastblock - 152 };
 688
 689                 lastblock = 0;
 690
 691                 /* Search for an anchor volume descriptor pointer */
 692
 693                 /*  according to spec, anchor is in either:
 694                  *     block 256
 695                  *     lastblock-256
 696                  *     lastblock
 697                  *  however, if the disc isn't closed, it could be 512 */
 698
 699                 for (i = 0; !lastblock && i < ARRAY_SIZE(last); i++) {
 700                         ident = location = 0;
 701                         if (last[i] >= 0) {
 702                                 bh = sb_bread(sb, last[i]);
 703                                 if (bh) {
 704                                         tag *t = (tag *)bh->b_data;
 705                                         ident = le16_to_cpu(t->tagIdent);
 706                                         location = le32_to_cpu(t->tagLocation);
 707                                         brelse(bh);
 708                                 }
 709                         }
 710
 711                         if (ident == TAG_IDENT_AVDP) {
 712                                 if (location == last[i] - sbi->s_session) {
 713                                         lastblock = last[i] - sbi->s_session;
 714                                         sbi->s_anchor[0] = lastblock;
 715                                         sbi->s_anchor[1] = lastblock - 256;
 716                                 } else if (location == udf_variable_to_fixed(last[i]) - sbi->s_session) {
 717                                         UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
 718                                         lastblock = udf_variable_to_fixed(last[i]) - sbi->s_session;
 719                                         sbi->s_anchor[0] = lastblock;
 720                                         sbi->s_anchor[1] = lastblock - 256 - sbi->s_session;
 721                                 } else {
 722                                         udf_debug("Anchor found at block %d, location mismatch %d.\n",
 723                                                   last[i], location);
 724                                 }
 725                         } else if (ident == TAG_IDENT_FE || ident == TAG_IDENT_EFE) {
 726                                 lastblock = last[i];
 727                                 sbi->s_anchor[3] = 512;
 728                         } else {
 729                                 ident = location = 0;
 730                                 if (last[i] >= 256) {
 731                                         bh = sb_bread(sb, last[i] - 256);
 732                                         if (bh) {
 733                                                 tag *t = (tag *)bh->b_data;
 734                                                 ident = le16_to_cpu(t->tagIdent);
 735                                                 location = le32_to_cpu(t->tagLocation);
 736                                                 brelse(bh);
 737                                         }
 738                                 }
 739
 740                                 if (ident == TAG_IDENT_AVDP &&
 741                                     location == last[i] - 256 - sbi->s_session) {
 742                                         lastblock = last[i];
 743                                         sbi->s_anchor[1] = last[i] - 256;
 744                                 } else {
 745                                         ident = location = 0;
 746                                         if (last[i] >= 312 + sbi->s_session) {
 747                                                 bh = sb_bread(sb, last[i] - 312 - sbi->s_session);
 748                                                 if (bh) {
 749                                                         tag *t = (tag *)bh->b_data;
 750                                                         ident = le16_to_cpu(t->tagIdent);
 751                                                         location = le32_to_cpu(t->tagLocation);
 752                                                         brelse(bh);
 753                                                 }
 754                                         }
 755
 756                                         if (ident == TAG_IDENT_AVDP &&
 757                                             location == udf_variable_to_fixed(last[i]) - 256) {
 758                                                 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
 759                                                 lastblock = udf_variable_to_fixed(last[i]);
 760                                                 sbi->s_anchor[1] = lastblock - 256;
 761                                         }
 762                                 }
 763                         }
 764                 }
 765         }
 766
 767         if (!lastblock) {
 768                 /* We haven't found the lastblock. check 312 */
 769                 bh = sb_bread(sb, 312 + sbi->s_session);
 770                 if (bh) {
 771                         tag *t = (tag *)bh->b_data;
 772                         ident = le16_to_cpu(t->tagIdent);
 773                         location = le32_to_cpu(t->tagLocation);
 774                         brelse(bh);
 775
 776                         if (ident == TAG_IDENT_AVDP && location == 256)
 777                                 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
 778                 }
 779         }
 780
 781         for (i = 0; i < ARRAY_SIZE(sbi->s_anchor); i++) {
 782                 if (sbi->s_anchor[i]) {
 783                         bh = udf_read_tagged(sb, sbi->s_anchor[i],
 784                                              sbi->s_anchor[i], &ident);
 785                         if (!bh)
 786                                 sbi->s_anchor[i] = 0;
 787                         else {
 788                                 brelse(bh);
 789                                 if ((ident != TAG_IDENT_AVDP) &&
 790                                     (i || (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE)))
 791                                         sbi->s_anchor[i] = 0;
 792                         }
 793                 }
 794         }
 795
 796         sbi->s_last_block = lastblock;
 797 }
 798
 799 static int udf_find_fileset(struct super_block *sb,
 800                             kernel_lb_addr *fileset,
 801                             kernel_lb_addr *root)
 802 {
 803         struct buffer_head *bh = NULL;
 804         long lastblock;
 805         uint16_t ident;
 806         struct udf_sb_info *sbi;
 807
 808         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
 809             fileset->partitionReferenceNum != 0xFFFF) {
 810                 bh = udf_read_ptagged(sb, *fileset, 0, &ident);
 811
 812                 if (!bh) {
 813                         return 1;
 814                 } else if (ident != TAG_IDENT_FSD) {
 815                         brelse(bh);
 816                         return 1;
 817                 }
 818
 819         }
 820
 821         sbi = UDF_SB(sb);
 822         if (!bh) {
 823                 /* Search backwards through the partitions */
 824                 kernel_lb_addr newfileset;
 825
 826 /* --> cvg: FIXME - is it reasonable? */
 827                 return 1;
 828
 829                 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
 830                      (newfileset.partitionReferenceNum != 0xFFFF &&
 831                       fileset->logicalBlockNum == 0xFFFFFFFF &&
 832                       fileset->partitionReferenceNum == 0xFFFF);
 833                      newfileset.partitionReferenceNum--) {
 834                         lastblock = sbi->s_partmaps
 835                                         [newfileset.partitionReferenceNum]
 836                                                 .s_partition_len;
 837                         newfileset.logicalBlockNum = 0;
 838
 839                         do {
 840                                 bh = udf_read_ptagged(sb, newfileset, 0,
 841                                                       &ident);
 842                                 if (!bh) {
 843                                         newfileset.logicalBlockNum++;
 844                                         continue;
 845                                 }
 846
 847                                 switch (ident) {
 848                                 case TAG_IDENT_SBD:
 849                                 {
 850                                         struct spaceBitmapDesc *sp;
 851                                         sp = (struct spaceBitmapDesc *)bh->b_data;
 852                                         newfileset.logicalBlockNum += 1 +
 853                                                 ((le32_to_cpu(sp->numOfBytes) +
 854                                                   sizeof(struct spaceBitmapDesc) - 1)
 855                                                  >> sb->s_blocksize_bits);
 856                                         brelse(bh);
 857                                         break;
 858                                 }
 859                                 case TAG_IDENT_FSD:
 860                                         *fileset = newfileset;
 861                                         break;
 862                                 default:
 863                                         newfileset.logicalBlockNum++;
 864                                         brelse(bh);
 865                                         bh = NULL;
 866                                         break;
 867                                 }
 868                         } while (newfileset.logicalBlockNum < lastblock &&
 869                                  fileset->logicalBlockNum == 0xFFFFFFFF &&
 870                                  fileset->partitionReferenceNum == 0xFFFF);
 871                 }
 872         }
 873
 874         if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
 875              fileset->partitionReferenceNum != 0xFFFF) && bh) {
 876                 udf_debug("Fileset at block=%d, partition=%d\n",
 877                           fileset->logicalBlockNum,
 878                           fileset->partitionReferenceNum);
 879
 880                 sbi->s_partition = fileset->partitionReferenceNum;
 881                 udf_load_fileset(sb, bh, root);
 882                 brelse(bh);
 883                 return 0;
 884         }
 885         return 1;
 886 }
 887
 888 static void udf_load_pvoldesc(struct super_block *sb, struct buffer_head *bh)
 889 {
 890         struct primaryVolDesc *pvoldesc;
 891         time_t recording;
 892         long recording_usec;
 893         struct ustr instr;
 894         struct ustr outstr;
 895
 896         pvoldesc = (struct primaryVolDesc *)bh->b_data;
 897
 898         if (udf_stamp_to_time(&recording, &recording_usec,
 899                               lets_to_cpu(pvoldesc->recordingDateAndTime))) {
 900                 kernel_timestamp ts;
 901                 ts = lets_to_cpu(pvoldesc->recordingDateAndTime);
 902                 udf_debug("recording time %ld/%ld, %04u/%02u/%02u"
 903                           " %02u:%02u (%x)\n",
 904                           recording, recording_usec,
 905                           ts.year, ts.month, ts.day, ts.hour,
 906                           ts.minute, ts.typeAndTimezone);
 907                 UDF_SB(sb)->s_record_time.tv_sec = recording;
 908                 UDF_SB(sb)->s_record_time.tv_nsec = recording_usec * 1000;
 909         }
 910
 911         if (!udf_build_ustr(&instr, pvoldesc->volIdent, 32)) {
 912                 if (udf_CS0toUTF8(&outstr, &instr)) {
 913                         strncpy(UDF_SB(sb)->s_volume_ident, outstr.u_name,
 914                                 outstr.u_len > 31 ? 31 : outstr.u_len);
 915                         udf_debug("volIdent[] = '%s'\n", UDF_SB(sb)->s_volume_ident);
 916                 }
 917         }
 918
 919         if (!udf_build_ustr(&instr, pvoldesc->volSetIdent, 128)) {
 920                 if (udf_CS0toUTF8(&outstr, &instr))
 921                         udf_debug("volSetIdent[] = '%s'\n", outstr.u_name);
 922         }
 923 }
 924
 925 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
 926                              kernel_lb_addr *root)
 927 {
 928         struct fileSetDesc *fset;
 929
 930         fset = (struct fileSetDesc *)bh->b_data;
 931
 932         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
 933
 934         UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
 935
 936         udf_debug("Rootdir at block=%d, partition=%d\n",
 937                   root->logicalBlockNum, root->partitionReferenceNum);
 938 }
 939
 940 static int udf_load_partdesc(struct super_block *sb, struct buffer_head *bh)
 941 {
 942         struct partitionDesc *p;
 943         int i;
 944         struct udf_part_map *map;
 945         struct udf_sb_info *sbi;
 946
 947         p = (struct partitionDesc *)bh->b_data;
 948         sbi = UDF_SB(sb);
 949
 950         for (i = 0; i < sbi->s_partitions; i++) {
 951                 map = &sbi->s_partmaps[i];
 952                 udf_debug("Searching map: (%d == %d)\n",
 953                           map->s_partition_num, le16_to_cpu(p->partitionNumber));
 954                 if (map->s_partition_num == le16_to_cpu(p->partitionNumber)) {
 955                         map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
 956                         map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
 957                         if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_READ_ONLY)
 958                                 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
 959                         if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_WRITE_ONCE)
 960                                 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
 961                         if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_REWRITABLE)
 962                                 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
 963                         if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_OVERWRITABLE)
 964                                 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
 965
 966                         if (!strcmp(p->partitionContents.ident,
 967                                     PD_PARTITION_CONTENTS_NSR02) ||
 968                             !strcmp(p->partitionContents.ident,
 969                                     PD_PARTITION_CONTENTS_NSR03)) {
 970                                 struct partitionHeaderDesc *phd;
 971
 972                                 phd = (struct partitionHeaderDesc *)(p->partitionContentsUse);
 973                                 if (phd->unallocSpaceTable.extLength) {
 974                                         kernel_lb_addr loc = {
 975                                                 .logicalBlockNum = le32_to_cpu(phd->unallocSpaceTable.extPosition),
 976                                                 .partitionReferenceNum = i,
 977                                         };
 978
 979                                         map->s_uspace.s_table =
 980                                                 udf_iget(sb, loc);
 981                                         if (!map->s_uspace.s_table) {
 982                                                 udf_debug("cannot load unallocSpaceTable (part %d)\n", i);
 983                                                 return 1;
 984                                         }
 985                                         map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
 986                                         udf_debug("unallocSpaceTable (part %d) @ %ld\n",
 987                                                   i, map->s_uspace.s_table->i_ino);
 988                                 }
 989                                 if (phd->unallocSpaceBitmap.extLength) {
 990                                         UDF_SB_ALLOC_BITMAP(sb, i, s_uspace);
 991                                         if (map->s_uspace.s_bitmap != NULL) {
 992                                                 map->s_uspace.s_bitmap->s_extLength =
 993                                                         le32_to_cpu(phd->unallocSpaceBitmap.extLength);
 994                                                 map->s_uspace.s_bitmap->s_extPosition =
 995                                                         le32_to_cpu(phd->unallocSpaceBitmap.extPosition);
 996                                                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
 997                                                 udf_debug("unallocSpaceBitmap (part %d) @ %d\n",
 998                                                           i, map->s_uspace.s_bitmap->s_extPosition);
 999                                         }
1000                                 }
1001                                 if (phd->partitionIntegrityTable.extLength)
1002                                         udf_debug("partitionIntegrityTable (part %d)\n", i);
1003                                 if (phd->freedSpaceTable.extLength) {
1004                                         kernel_lb_addr loc = {
1005                                                 .logicalBlockNum = le32_to_cpu(phd->freedSpaceTable.extPosition),
1006                                                 .partitionReferenceNum = i,
1007                                         };
1008
1009                                         map->s_fspace.s_table =
1010                                                 udf_iget(sb, loc);
1011                                         if (!map->s_fspace.s_table) {
1012                                                 udf_debug("cannot load freedSpaceTable (part %d)\n", i);
1013                                                 return 1;
1014                                         }
1015                                         map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
1016                                         udf_debug("freedSpaceTable (part %d) @ %ld\n",
1017                                                   i, map->s_fspace.s_table->i_ino);
1018                                 }
1019                                 if (phd->freedSpaceBitmap.extLength) {
1020                                         UDF_SB_ALLOC_BITMAP(sb, i, s_fspace);
1021                                         if (map->s_fspace.s_bitmap != NULL) {
1022                                                 map->s_fspace.s_bitmap->s_extLength =
1023                                                         le32_to_cpu(phd->freedSpaceBitmap.extLength);
1024                                                 map->s_fspace.s_bitmap->s_extPosition =
1025                                                         le32_to_cpu(phd->freedSpaceBitmap.extPosition);
1026                                                 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1027                                                 udf_debug("freedSpaceBitmap (part %d) @ %d\n",
1028                                                           i, map->s_fspace.s_bitmap->s_extPosition);
1029                                         }
1030                                 }
1031                         }
1032                         break;
1033                 }
1034         }
1035         if (i == sbi->s_partitions) {
1036                 udf_debug("Partition (%d) not found in partition map\n",
1037                           le16_to_cpu(p->partitionNumber));
1038         } else {
1039                 udf_debug("Partition (%d:%d type %x) starts at physical %d, "
1040                           "block length %d\n",
1041                           le16_to_cpu(p->partitionNumber), i,
1042                           map->s_partition_type,
1043                           map->s_partition_root,
1044                           map->s_partition_len);
1045         }
1046         return 0;
1047 }
1048
1049 static int udf_load_logicalvol(struct super_block *sb, struct buffer_head *bh,
1050                                kernel_lb_addr *fileset)
1051 {
1052         struct logicalVolDesc *lvd;
1053         int i, j, offset;
1054         uint8_t type;
1055         struct udf_sb_info *sbi = UDF_SB(sb);
1056
1057         lvd = (struct logicalVolDesc *)bh->b_data;
1058
1059         i = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1060         if (i != 0)
1061                 return i;
1062
1063         for (i = 0, offset = 0;
1064              i < sbi->s_partitions && offset < le32_to_cpu(lvd->mapTableLength);
1065              i++, offset += ((struct genericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapLength) {
1066                 struct udf_part_map *map = &sbi->s_partmaps[i];
1067                 type = ((struct genericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapType;
1068                 if (type == 1) {
1069                         struct genericPartitionMap1 *gpm1 = (struct genericPartitionMap1 *)&(lvd->partitionMaps[offset]);
1070                         map->s_partition_type = UDF_TYPE1_MAP15;
1071                         map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1072                         map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1073                         map->s_partition_func = NULL;
1074                 } else if (type == 2) {
1075                         struct udfPartitionMap2 *upm2 = (struct udfPartitionMap2 *)&(lvd->partitionMaps[offset]);
1076                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL, strlen(UDF_ID_VIRTUAL))) {
1077                                 if (le16_to_cpu(((__le16 *)upm2->partIdent.identSuffix)[0]) == 0x0150) {
1078                                         map->s_partition_type = UDF_VIRTUAL_MAP15;
1079                                         map->s_partition_func = udf_get_pblock_virt15;
1080                                 } else if (le16_to_cpu(((__le16 *)upm2->partIdent.identSuffix)[0]) == 0x0200) {
1081                                         map->s_partition_type = UDF_VIRTUAL_MAP20;
1082                                         map->s_partition_func = udf_get_pblock_virt20;
1083                                 }
1084                         } else if (!strncmp(upm2->partIdent.ident, UDF_ID_SPARABLE, strlen(UDF_ID_SPARABLE))) {
1085                                 uint32_t loc;
1086                                 uint16_t ident;
1087                                 struct sparingTable *st;
1088                                 struct sparablePartitionMap *spm = (struct sparablePartitionMap *)&(lvd->partitionMaps[offset]);
1089
1090                                 map->s_partition_type = UDF_SPARABLE_MAP15;
1091                                 map->s_type_specific.s_sparing.s_packet_len = le16_to_cpu(spm->packetLength);
1092                                 for (j = 0; j < spm->numSparingTables; j++) {
1093                                         loc = le32_to_cpu(spm->locSparingTable[j]);
1094                                         map->s_type_specific.s_sparing.s_spar_map[j] =
1095                                                 udf_read_tagged(sb, loc, loc, &ident);
1096                                         if (map->s_type_specific.s_sparing.s_spar_map[j] != NULL) {
1097                                                 st = (struct sparingTable *)map->s_type_specific.s_sparing.s_spar_map[j]->b_data;
1098                                                 if (ident != 0 ||
1099                                                     strncmp(st->sparingIdent.ident, UDF_ID_SPARING, strlen(UDF_ID_SPARING))) {
1100                                                         brelse(map->s_type_specific.s_sparing.s_spar_map[j]);
1101                                                         map->s_type_specific.s_sparing.s_spar_map[j] = NULL;
1102                                                 }
1103                                         }
1104                                 }
1105                                 map->s_partition_func = udf_get_pblock_spar15;
1106                         } else {
1107                                 udf_debug("Unknown ident: %s\n",
1108                                           upm2->partIdent.ident);
1109                                 continue;
1110                         }
1111                         map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1112                         map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1113                 }
1114                 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1115                           i, map->s_partition_num, type,
1116                           map->s_volumeseqnum);
1117         }
1118
1119         if (fileset) {
1120                 long_ad *la = (long_ad *)&(lvd->logicalVolContentsUse[0]);
1121
1122                 *fileset = lelb_to_cpu(la->extLocation);
1123                 udf_debug("FileSet found in LogicalVolDesc at block=%d, "
1124                           "partition=%d\n", fileset->logicalBlockNum,
1125                           fileset->partitionReferenceNum);
1126         }
1127         if (lvd->integritySeqExt.extLength)
1128                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1129
1130         return 0;
1131 }
1132
1133 /*
1134  * udf_load_logicalvolint
1135  *
1136  */
1137 static void udf_load_logicalvolint(struct super_block *sb, kernel_extent_ad loc)
1138 {
1139         struct buffer_head *bh = NULL;
1140         uint16_t ident;
1141         struct udf_sb_info *sbi = UDF_SB(sb);
1142         struct logicalVolIntegrityDesc *lvid;
1143
1144         while (loc.extLength > 0 &&
1145                (bh = udf_read_tagged(sb, loc.extLocation,
1146                                      loc.extLocation, &ident)) &&
1147                ident == TAG_IDENT_LVID) {
1148                 sbi->s_lvid_bh = bh;
1149                 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1150
1151                 if (lvid->nextIntegrityExt.extLength)
1152                         udf_load_logicalvolint(sb,
1153                                 leea_to_cpu(lvid->nextIntegrityExt));
1154
1155                 if (sbi->s_lvid_bh != bh)
1156                         brelse(bh);
1157                 loc.extLength -= sb->s_blocksize;
1158                 loc.extLocation++;
1159         }
1160         if (sbi->s_lvid_bh != bh)
1161                 brelse(bh);
1162 }
1163
1164 /*
1165  * udf_process_sequence
1166  *
1167  * PURPOSE
1168  *      Process a main/reserve volume descriptor sequence.
1169  *
1170  * PRE-CONDITIONS
1171  *      sb                      Pointer to _locked_ superblock.
1172  *      block                   First block of first extent of the sequence.
1173  *      lastblock               Lastblock of first extent of the sequence.
1174  *
1175  * HISTORY
1176  *      July 1, 1997 - Andrew E. Mileski
1177  *      Written, tested, and released.
1178  */
1179 static int udf_process_sequence(struct super_block *sb, long block,
1180                                 long lastblock, kernel_lb_addr *fileset)
1181 {
1182         struct buffer_head *bh = NULL;
1183         struct udf_vds_record vds[VDS_POS_LENGTH];
1184         struct generic_desc *gd;
1185         struct volDescPtr *vdp;
1186         int done = 0;
1187         int i, j;
1188         uint32_t vdsn;
1189         uint16_t ident;
1190         long next_s = 0, next_e = 0;
1191
1192         memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1193
1194         /* Read the main descriptor sequence */
1195         for (; (!done && block <= lastblock); block++) {
1196
1197                 bh = udf_read_tagged(sb, block, block, &ident);
1198                 if (!bh)
1199                         break;
1200
1201                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1202                 gd = (struct generic_desc *)bh->b_data;
1203                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1204                 switch (ident) {
1205                 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1206                         if (vdsn >= vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum) {
1207                                 vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum = vdsn;
1208                                 vds[VDS_POS_PRIMARY_VOL_DESC].block = block;
1209                         }
1210                         break;
1211                 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1212                         if (vdsn >= vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum) {
1213                                 vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum = vdsn;
1214                                 vds[VDS_POS_VOL_DESC_PTR].block = block;
1215
1216                                 vdp = (struct volDescPtr *)bh->b_data;
1217                                 next_s = le32_to_cpu(vdp->nextVolDescSeqExt.extLocation);
1218                                 next_e = le32_to_cpu(vdp->nextVolDescSeqExt.extLength);
1219                                 next_e = next_e >> sb->s_blocksize_bits;
1220                                 next_e += next_s;
1221                         }
1222                         break;
1223                 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1224                         if (vdsn >= vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum) {
1225                                 vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum = vdsn;
1226                                 vds[VDS_POS_IMP_USE_VOL_DESC].block = block;
1227                         }
1228                         break;
1229                 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1230                         if (!vds[VDS_POS_PARTITION_DESC].block)
1231                                 vds[VDS_POS_PARTITION_DESC].block = block;
1232                         break;
1233                 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1234                         if (vdsn >= vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum) {
1235                                 vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum = vdsn;
1236                                 vds[VDS_POS_LOGICAL_VOL_DESC].block = block;
1237                         }
1238                         break;
1239                 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1240                         if (vdsn >= vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum) {
1241                                 vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum = vdsn;
1242                                 vds[VDS_POS_UNALLOC_SPACE_DESC].block = block;
1243                         }
1244                         break;
1245                 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1246                         vds[VDS_POS_TERMINATING_DESC].block = block;
1247                         if (next_e) {
1248                                 block = next_s;
1249                                 lastblock = next_e;
1250                                 next_s = next_e = 0;
1251                         } else {
1252                                 done = 1;
1253                         }
1254                         break;
1255                 }
1256                 brelse(bh);
1257         }
1258         for (i = 0; i < VDS_POS_LENGTH; i++) {
1259                 if (vds[i].block) {
1260                         bh = udf_read_tagged(sb, vds[i].block, vds[i].block,
1261                                              &ident);
1262
1263                         if (i == VDS_POS_PRIMARY_VOL_DESC) {
1264                                 udf_load_pvoldesc(sb, bh);
1265                         } else if (i == VDS_POS_LOGICAL_VOL_DESC) {
1266                                 udf_load_logicalvol(sb, bh, fileset); /* TODO: check return value */
1267                         } else if (i == VDS_POS_PARTITION_DESC) {
1268                                 struct buffer_head *bh2 = NULL;
1269                                 if (udf_load_partdesc(sb, bh)) {
1270                                         brelse(bh);
1271                                         return 1;
1272                                 }
1273                                 for (j = vds[i].block + 1;
1274                                      j <  vds[VDS_POS_TERMINATING_DESC].block;
1275                                      j++) {
1276                                         bh2 = udf_read_tagged(sb, j, j, &ident);
1277                                         gd = (struct generic_desc *)bh2->b_data;
1278                                         if (ident == TAG_IDENT_PD)
1279                                                 if (udf_load_partdesc(sb,
1280                                                                       bh2)) {
1281                                                         brelse(bh);
1282                                                         brelse(bh2);
1283                                                         return 1;
1284                                                 }
1285                                         brelse(bh2);
1286                                 }
1287                         }
1288                         brelse(bh);
1289                 }
1290         }
1291
1292         return 0;
1293 }
1294
1295 /*
1296  * udf_check_valid()
1297  */
1298 static int udf_check_valid(struct super_block *sb, int novrs, int silent)
1299 {
1300         long block;
1301
1302         if (novrs) {
1303                 udf_debug("Validity check skipped because of novrs option\n");
1304                 return 0;
1305         }
1306         /* Check that it is NSR02 compliant */
1307         /* Process any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
1308         else {
1309                 block = udf_vrs(sb, silent);
1310                 if (block == -1) {
1311                         struct udf_sb_info *sbi = UDF_SB(sb);
1312                         udf_debug("Failed to read byte 32768. Assuming open "
1313                                   "disc. Skipping validity check\n");
1314                         if (!sbi->s_last_block)
1315                                 sbi->s_last_block = udf_get_last_block(sb);
1316                         return 0;
1317                 } else
1318                         return !block;
1319         }
1320 }
1321
1322 static int udf_load_partition(struct super_block *sb, kernel_lb_addr *fileset)
1323 {
1324         struct anchorVolDescPtr *anchor;
1325         uint16_t ident;
1326         struct buffer_head *bh;
1327         long main_s, main_e, reserve_s, reserve_e;
1328         int i, j;
1329         struct udf_sb_info *sbi;
1330
1331         if (!sb)
1332                 return 1;
1333         sbi = UDF_SB(sb);
1334
1335         for (i = 0; i < ARRAY_SIZE(sbi->s_anchor); i++) {
1336                 if (sbi->s_anchor[i] &&
1337                     (bh = udf_read_tagged(sb, sbi->s_anchor[i],
1338                                           sbi->s_anchor[i], &ident))) {
1339                         anchor = (struct anchorVolDescPtr *)bh->b_data;
1340
1341                         /* Locate the main sequence */
1342                         main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1343                         main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1344                         main_e = main_e >> sb->s_blocksize_bits;
1345                         main_e += main_s;
1346
1347                         /* Locate the reserve sequence */
1348                         reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1349                         reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1350                         reserve_e = reserve_e >> sb->s_blocksize_bits;
1351                         reserve_e += reserve_s;
1352
1353                         brelse(bh);
1354
1355                         /* Process the main & reserve sequences */
1356                         /* responsible for finding the PartitionDesc(s) */
1357                         if (!(udf_process_sequence(sb, main_s, main_e, fileset) &&
1358                               udf_process_sequence(sb, reserve_s, reserve_e, fileset)))
1359                                 break;
1360                 }
1361         }
1362
1363         if (i == ARRAY_SIZE(sbi->s_anchor)) {
1364                 udf_debug("No Anchor block found\n");
1365                 return 1;
1366         } else
1367                 udf_debug("Using anchor in block %d\n", sbi->s_anchor[i]);
1368
1369         for (i = 0; i < sbi->s_partitions; i++) {
1370                 kernel_lb_addr uninitialized_var(ino);
1371                 struct udf_part_map *map = &sbi->s_partmaps[i];
1372                 switch (map->s_partition_type) {
1373                 case UDF_VIRTUAL_MAP15:
1374                 case UDF_VIRTUAL_MAP20:
1375                         if (!sbi->s_last_block) {
1376                                 sbi->s_last_block = udf_get_last_block(sb);
1377                                 udf_find_anchor(sb);
1378                         }
1379
1380                         if (!sbi->s_last_block) {
1381                                 udf_debug("Unable to determine Lastblock (For "
1382                                           "Virtual Partition)\n");
1383                                 return 1;
1384                         }
1385
1386                         for (j = 0; j < sbi->s_partitions; j++) {
1387                                 struct udf_part_map *map2 = &sbi->s_partmaps[j];
1388                                 if (j != i &&
1389                                     map->s_volumeseqnum == map2->s_volumeseqnum &&
1390                                     map->s_partition_num == map2->s_partition_num) {
1391                                         ino.partitionReferenceNum = j;
1392                                         ino.logicalBlockNum = sbi->s_last_block - map2->s_partition_root;
1393                                         break;
1394                                 }
1395                         }
1396
1397                         if (j == sbi->s_partitions)
1398                                 return 1;
1399
1400                         sbi->s_vat_inode = udf_iget(sb, ino);
1401                         if (!sbi->s_vat_inode)
1402                                 return 1;
1403
1404                         if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1405                                 map->s_type_specific.s_virtual.s_start_offset =
1406                                         udf_ext0_offset(sbi->s_vat_inode);
1407                                 map->s_type_specific.s_virtual.s_num_entries =
1408                                         (sbi->s_vat_inode->i_size - 36) >> 2;
1409                         } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1410                                 struct buffer_head *bh = NULL;
1411                                 uint32_t pos;
1412
1413                                 pos = udf_block_map(sbi->s_vat_inode, 0);
1414                                 bh = sb_bread(sb, pos);
1415                                 if (!bh)
1416                                         return 1;
1417                                 map->s_type_specific.s_virtual.s_start_offset =
1418                                         le16_to_cpu(((struct virtualAllocationTable20 *)bh->b_data +
1419                                                      udf_ext0_offset(sbi->s_vat_inode))->lengthHeader) +
1420                                         udf_ext0_offset(sbi->s_vat_inode);
1421                                 map->s_type_specific.s_virtual.s_num_entries = (sbi->s_vat_inode->i_size -
1422                                                                         map->s_type_specific.s_virtual.s_start_offset) >> 2;
1423                                 brelse(bh);
1424                         }
1425                         map->s_partition_root = udf_get_pblock(sb, 0, i, 0);
1426                         map->s_partition_len =
1427                                 sbi->s_partmaps[ino.partitionReferenceNum].
1428                                                                 s_partition_len;
1429                 }
1430         }
1431         return 0;
1432 }
1433
1434 static void udf_open_lvid(struct super_block *sb)
1435 {
1436         struct udf_sb_info *sbi = UDF_SB(sb);
1437         struct buffer_head *bh = sbi->s_lvid_bh;
1438         if (bh) {
1439                 int i;
1440                 kernel_timestamp cpu_time;
1441                 struct logicalVolIntegrityDesc *lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1442                 struct logicalVolIntegrityDescImpUse *lvidiu = udf_sb_lvidiu(sbi);
1443
1444                 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1445                 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1446                 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
1447                         lvid->recordingDateAndTime = cpu_to_lets(cpu_time);
1448                 lvid->integrityType = LVID_INTEGRITY_TYPE_OPEN;
1449
1450                 lvid->descTag.descCRC = cpu_to_le16(udf_crc((char *)lvid + sizeof(tag),
1451                                                                        le16_to_cpu(lvid->descTag.descCRCLength), 0));
1452
1453                 lvid->descTag.tagChecksum = 0;
1454                 for (i = 0; i < 16; i++)
1455                         if (i != 4)
1456                                 lvid->descTag.tagChecksum +=
1457                                         ((uint8_t *) &(lvid->descTag))[i];
1458
1459                 mark_buffer_dirty(bh);
1460         }
1461 }
1462
1463 static void udf_close_lvid(struct super_block *sb)
1464 {
1465         kernel_timestamp cpu_time;
1466         int i;
1467         struct udf_sb_info *sbi = UDF_SB(sb);
1468         struct buffer_head *bh = sbi->s_lvid_bh;
1469         struct logicalVolIntegrityDesc *lvid;
1470
1471         if (!bh)
1472                 return;
1473
1474         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1475
1476         if (lvid->integrityType == LVID_INTEGRITY_TYPE_OPEN) {
1477                 struct logicalVolIntegrityDescImpUse *lvidiu = udf_sb_lvidiu(sbi);
1478                 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1479                 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1480                 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
1481                         lvid->recordingDateAndTime = cpu_to_lets(cpu_time);
1482                 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1483                         lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1484                 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1485                         lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1486                 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
1487                         lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
1488                 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1489
1490                 lvid->descTag.descCRC =
1491                         cpu_to_le16(udf_crc((char *)lvid + sizeof(tag),
1492                                             le16_to_cpu(lvid->descTag.descCRCLength), 0));
1493
1494                 lvid->descTag.tagChecksum = 0;
1495                 for (i = 0; i < 16; i++)
1496                         if (i != 4)
1497                                 lvid->descTag.tagChecksum +=
1498                                         ((uint8_t *)&(lvid->descTag))[i];
1499
1500                 mark_buffer_dirty(bh);
1501         }
1502 }
1503
1504 /*
1505  * udf_read_super
1506  *
1507  * PURPOSE
1508  *      Complete the specified super block.
1509  *
1510  * PRE-CONDITIONS
1511  *      sb                      Pointer to superblock to complete - never NULL.
1512  *      sb->s_dev               Device to read suberblock from.
1513  *      options                 Pointer to mount options.
1514  *      silent                  Silent flag.
1515  *
1516  * HISTORY
1517  *      July 1, 1997 - Andrew E. Mileski
1518  *      Written, tested, and released.
1519  */
1520 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1521 {
1522         int i;
1523         struct inode *inode = NULL;
1524         struct udf_options uopt;
1525         kernel_lb_addr rootdir, fileset;
1526         struct udf_sb_info *sbi;
1527
1528         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1529         uopt.uid = -1;
1530         uopt.gid = -1;
1531         uopt.umask = 0;
1532
1533         sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1534         if (!sbi)
1535                 return -ENOMEM;
1536
1537         sb->s_fs_info = sbi;
1538
1539         mutex_init(&sbi->s_alloc_mutex);
1540
1541         if (!udf_parse_options((char *)options, &uopt))
1542                 goto error_out;
1543
1544         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1545             uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
1546                 udf_error(sb, "udf_read_super",
1547                           "utf8 cannot be combined with iocharset\n");
1548                 goto error_out;
1549         }
1550 #ifdef CONFIG_UDF_NLS
1551         if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1552                 uopt.nls_map = load_nls_default();
1553                 if (!uopt.nls_map)
1554                         uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1555                 else
1556                         udf_debug("Using default NLS map\n");
1557         }
1558 #endif
1559         if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1560                 uopt.flags |= (1 << UDF_FLAG_UTF8);
1561
1562         fileset.logicalBlockNum = 0xFFFFFFFF;
1563         fileset.partitionReferenceNum = 0xFFFF;
1564
1565         sbi->s_flags = uopt.flags;
1566         sbi->s_uid = uopt.uid;
1567         sbi->s_gid = uopt.gid;
1568         sbi->s_umask = uopt.umask;
1569         sbi->s_nls_map = uopt.nls_map;
1570
1571         /* Set the block size for all transfers */
1572         if (!udf_set_blocksize(sb, uopt.blocksize))
1573                 goto error_out;
1574
1575         if (uopt.session == 0xFFFFFFFF)
1576                 sbi->s_session = udf_get_last_session(sb);
1577         else
1578                 sbi->s_session = uopt.session;
1579
1580         udf_debug("Multi-session=%d\n", sbi->s_session);
1581
1582         sbi->s_last_block = uopt.lastblock;
1583         sbi->s_anchor[0] = sbi->s_anchor[1] = 0;
1584         sbi->s_anchor[2] = uopt.anchor;
1585         sbi->s_anchor[3] = 256;
1586
1587         if (udf_check_valid(sb, uopt.novrs, silent)) {
1588                 /* read volume recognition sequences */
1589                 printk(KERN_WARNING "UDF-fs: No VRS found\n");
1590                 goto error_out;
1591         }
1592
1593         udf_find_anchor(sb);
1594
1595         /* Fill in the rest of the superblock */
1596         sb->s_op = &udf_sb_ops;
1597         sb->dq_op = NULL;
1598         sb->s_dirt = 0;
1599         sb->s_magic = UDF_SUPER_MAGIC;
1600         sb->s_time_gran = 1000;
1601
1602         if (udf_load_partition(sb, &fileset)) {
1603                 printk(KERN_WARNING "UDF-fs: No partition found (1)\n");
1604                 goto error_out;
1605         }
1606
1607         udf_debug("Lastblock=%d\n", sbi->s_last_block);
1608
1609         if (sbi->s_lvid_bh) {
1610                 struct logicalVolIntegrityDescImpUse *lvidiu = udf_sb_lvidiu(sbi);
1611                 uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
1612                 uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
1613                 /* uint16_t maxUDFWriteRev = le16_to_cpu(lvidiu->maxUDFWriteRev); */
1614
1615                 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
1616                         printk(KERN_ERR "UDF-fs: minUDFReadRev=%x (max is %x)\n",
1617                                le16_to_cpu(lvidiu->minUDFReadRev),
1618                                UDF_MAX_READ_VERSION);
1619                         goto error_out;
1620                 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION) {
1621                         sb->s_flags |= MS_RDONLY;
1622                 }
1623
1624                 sbi->s_udfrev = minUDFWriteRev;
1625
1626                 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1627                         UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
1628                 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
1629                         UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
1630         }
1631
1632         if (!sbi->s_partitions) {
1633                 printk(KERN_WARNING "UDF-fs: No partition found (2)\n");
1634                 goto error_out;
1635         }
1636
1637         if (sbi->s_partmaps[sbi->s_partition].s_partition_flags & UDF_PART_FLAG_READ_ONLY) {
1638                 printk(KERN_NOTICE "UDF-fs: Partition marked readonly; forcing readonly mount\n");
1639                 sb->s_flags |= MS_RDONLY;
1640         }
1641
1642         if (udf_find_fileset(sb, &fileset, &rootdir)) {
1643                 printk(KERN_WARNING "UDF-fs: No fileset found\n");
1644                 goto error_out;
1645         }
1646
1647         if (!silent) {
1648                 kernel_timestamp ts;
1649                 udf_time_to_stamp(&ts, sbi->s_record_time);
1650                 udf_info("UDF %s (%s) Mounting volume '%s', "
1651                          "timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
1652                          UDFFS_VERSION, UDFFS_DATE,
1653                          sbi->s_volume_ident, ts.year, ts.month, ts.day,
1654                          ts.hour, ts.minute, ts.typeAndTimezone);
1655         }
1656         if (!(sb->s_flags & MS_RDONLY))
1657                 udf_open_lvid(sb);
1658
1659         /* Assign the root inode */
1660         /* assign inodes by physical block number */
1661         /* perhaps it's not extensible enough, but for now ... */
1662         inode = udf_iget(sb, rootdir);
1663         if (!inode) {
1664                 printk(KERN_ERR "UDF-fs: Error in udf_iget, block=%d, partition=%d\n",
1665                        rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
1666                 goto error_out;
1667         }
1668
1669         /* Allocate a dentry for the root inode */
1670         sb->s_root = d_alloc_root(inode);
1671         if (!sb->s_root) {
1672                 printk(KERN_ERR "UDF-fs: Couldn't allocate root dentry\n");
1673                 iput(inode);
1674                 goto error_out;
1675         }
1676         sb->s_maxbytes = MAX_LFS_FILESIZE;
1677         return 0;
1678
1679 error_out:
1680         if (sbi->s_vat_inode)
1681                 iput(sbi->s_vat_inode);
1682         if (sbi->s_partitions) {
1683                 struct udf_part_map *map = &sbi->s_partmaps[sbi->s_partition];
1684                 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1685                         iput(map->s_uspace.s_table);
1686                 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1687                         iput(map->s_fspace.s_table);
1688                 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1689                         UDF_SB_FREE_BITMAP(sb, sbi->s_partition, s_uspace);
1690                 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1691                         UDF_SB_FREE_BITMAP(sb, sbi->s_partition, s_fspace);
1692                 if (map->s_partition_type == UDF_SPARABLE_MAP15)
1693                         for (i = 0; i < 4; i++)
1694                                 brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
1695         }
1696 #ifdef CONFIG_UDF_NLS
1697         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1698                 unload_nls(sbi->s_nls_map);
1699 #endif
1700         if (!(sb->s_flags & MS_RDONLY))
1701                 udf_close_lvid(sb);
1702         brelse(sbi->s_lvid_bh);
1703
1704         kfree(sbi->s_partmaps);
1705         kfree(sbi);
1706         sb->s_fs_info = NULL;
1707
1708         return -EINVAL;
1709 }
1710
1711 void udf_error(struct super_block *sb, const char *function,
1712                const char *fmt, ...)
1713 {
1714         va_list args;
1715
1716         if (!(sb->s_flags & MS_RDONLY)) {
1717                 /* mark sb error */
1718                 sb->s_dirt = 1;
1719         }
1720         va_start(args, fmt);
1721         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1722         va_end(args);
1723         printk(KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
1724                 sb->s_id, function, error_buf);
1725 }
1726
1727 void udf_warning(struct super_block *sb, const char *function,
1728                  const char *fmt, ...)
1729 {
1730         va_list args;
1731
1732         va_start(args, fmt);
1733         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1734         va_end(args);
1735         printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
1736                sb->s_id, function, error_buf);
1737 }
1738
1739 /*
1740  * udf_put_super
1741  *
1742  * PURPOSE
1743  *      Prepare for destruction of the superblock.
1744  *
1745  * DESCRIPTION
1746  *      Called before the filesystem is unmounted.
1747  *
1748  * HISTORY
1749  *      July 1, 1997 - Andrew E. Mileski
1750  *      Written, tested, and released.
1751  */
1752 static void udf_put_super(struct super_block *sb)
1753 {
1754         int i;
1755         struct udf_sb_info *sbi;
1756
1757         sbi = UDF_SB(sb);
1758         if (sbi->s_vat_inode)
1759                 iput(sbi->s_vat_inode);
1760         if (sbi->s_partitions) {
1761                 struct udf_part_map *map = &sbi->s_partmaps[sbi->s_partition];
1762                 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1763                         iput(map->s_uspace.s_table);
1764                 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1765                         iput(map->s_fspace.s_table);
1766                 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1767                         UDF_SB_FREE_BITMAP(sb, sbi->s_partition, s_uspace);
1768                 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1769                         UDF_SB_FREE_BITMAP(sb, sbi->s_partition, s_fspace);
1770                 if (map->s_partition_type == UDF_SPARABLE_MAP15)
1771                         for (i = 0; i < 4; i++)
1772                                 brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
1773         }
1774 #ifdef CONFIG_UDF_NLS
1775         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1776                 unload_nls(sbi->s_nls_map);
1777 #endif
1778         if (!(sb->s_flags & MS_RDONLY))
1779                 udf_close_lvid(sb);
1780         brelse(sbi->s_lvid_bh);
1781         kfree(sbi->s_partmaps);
1782         kfree(sb->s_fs_info);
1783         sb->s_fs_info = NULL;
1784 }
1785
1786 /*
1787  * udf_stat_fs
1788  *
1789  * PURPOSE
1790  *      Return info about the filesystem.
1791  *
1792  * DESCRIPTION
1793  *      Called by sys_statfs()
1794  *
1795  * HISTORY
1796  *      July 1, 1997 - Andrew E. Mileski
1797  *      Written, tested, and released.
1798  */
1799 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
1800 {
1801         struct super_block *sb = dentry->d_sb;
1802         struct udf_sb_info *sbi = UDF_SB(sb);
1803         struct logicalVolIntegrityDescImpUse *lvidiu;
1804
1805         if (sbi->s_lvid_bh != NULL)
1806                 lvidiu = udf_sb_lvidiu(sbi);
1807         else
1808                 lvidiu = NULL;
1809
1810         buf->f_type = UDF_SUPER_MAGIC;
1811         buf->f_bsize = sb->s_blocksize;
1812         buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
1813         buf->f_bfree = udf_count_free(sb);
1814         buf->f_bavail = buf->f_bfree;
1815         buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
1816                                           le32_to_cpu(lvidiu->numDirs)) : 0)
1817                         + buf->f_bfree;
1818         buf->f_ffree = buf->f_bfree;
1819         /* __kernel_fsid_t f_fsid */
1820         buf->f_namelen = UDF_NAME_LEN - 2;
1821
1822         return 0;
1823 }
1824
1825 static unsigned char udf_bitmap_lookup[16] = {
1826         0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4
1827 };
1828
1829 static unsigned int udf_count_free_bitmap(struct super_block *sb, struct udf_bitmap *bitmap)
1830 {
1831         struct buffer_head *bh = NULL;
1832         unsigned int accum = 0;
1833         int index;
1834         int block = 0, newblock;
1835         kernel_lb_addr loc;
1836         uint32_t bytes;
1837         uint8_t value;
1838         uint8_t *ptr;
1839         uint16_t ident;
1840         struct spaceBitmapDesc *bm;
1841
1842         lock_kernel();
1843
1844         loc.logicalBlockNum = bitmap->s_extPosition;
1845         loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
1846         bh = udf_read_ptagged(sb, loc, 0, &ident);
1847
1848         if (!bh) {
1849                 printk(KERN_ERR "udf: udf_count_free failed\n");
1850                 goto out;
1851         } else if (ident != TAG_IDENT_SBD) {
1852                 brelse(bh);
1853                 printk(KERN_ERR "udf: udf_count_free failed\n");
1854                 goto out;
1855         }
1856
1857         bm = (struct spaceBitmapDesc *)bh->b_data;
1858         bytes = le32_to_cpu(bm->numOfBytes);
1859         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
1860         ptr = (uint8_t *)bh->b_data;
1861
1862         while (bytes > 0) {
1863                 while ((bytes > 0) && (index < sb->s_blocksize)) {
1864                         value = ptr[index];
1865                         accum += udf_bitmap_lookup[value & 0x0f];
1866                         accum += udf_bitmap_lookup[value >> 4];
1867                         index++;
1868                         bytes--;
1869                 }
1870                 if (bytes) {
1871                         brelse(bh);
1872                         newblock = udf_get_lb_pblock(sb, loc, ++block);
1873                         bh = udf_tread(sb, newblock);
1874                         if (!bh) {
1875                                 udf_debug("read failed\n");
1876                                 goto out;
1877                         }
1878                         index = 0;
1879                         ptr = (uint8_t *)bh->b_data;
1880                 }
1881         }
1882         brelse(bh);
1883
1884 out:
1885         unlock_kernel();
1886
1887         return accum;
1888 }
1889
1890 static unsigned int udf_count_free_table(struct super_block *sb, struct inode *table)
1891 {
1892         unsigned int accum = 0;
1893         uint32_t elen;
1894         kernel_lb_addr eloc;
1895         int8_t etype;
1896         struct extent_position epos;
1897
1898         lock_kernel();
1899
1900         epos.block = UDF_I_LOCATION(table);
1901         epos.offset = sizeof(struct unallocSpaceEntry);
1902         epos.bh = NULL;
1903
1904         while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
1905                 accum += (elen >> table->i_sb->s_blocksize_bits);
1906
1907         brelse(epos.bh);
1908
1909         unlock_kernel();
1910
1911         return accum;
1912 }
1913
1914 static unsigned int udf_count_free(struct super_block *sb)
1915 {
1916         unsigned int accum = 0;
1917         struct udf_sb_info *sbi;
1918         struct udf_part_map *map;
1919
1920         sbi = UDF_SB(sb);
1921         if (sbi->s_lvid_bh) {
1922                 struct logicalVolIntegrityDesc *lvid = (struct logicalVolIntegrityDesc *)sbi->s_lvid_bh->b_data;
1923                 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
1924                         accum = le32_to_cpu(lvid->freeSpaceTable[sbi->s_partition]);
1925                         if (accum == 0xFFFFFFFF)
1926                                 accum = 0;
1927                 }
1928         }
1929
1930         if (accum)
1931                 return accum;
1932
1933         map = &sbi->s_partmaps[sbi->s_partition];
1934         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
1935                 accum += udf_count_free_bitmap(sb,
1936                                                map->s_uspace.s_bitmap);
1937         }
1938         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
1939                 accum += udf_count_free_bitmap(sb,
1940                                                map->s_fspace.s_bitmap);
1941         }
1942         if (accum)
1943                 return accum;
1944
1945         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
1946                 accum += udf_count_free_table(sb,
1947                                               map->s_uspace.s_table);
1948         }
1949         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
1950                 accum += udf_count_free_table(sb,
1951                                               map->s_fspace.s_table);
1952         }
1953
1954         return accum;
1955 }