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   1 /*
   2  * super.c
   3  *
   4  * PURPOSE
   5  *  Super block routines for the OSTA-UDF(tm) filesystem.
   6  *
   7  * DESCRIPTION
   8  *  OSTA-UDF(tm) = Optical Storage Technology Association
   9  *  Universal Disk Format.
  10  *
  11  *  This code is based on version 2.00 of the UDF specification,
  12  *  and revision 3 of the ECMA 167 standard [equivalent to ISO 13346].
  13  *    http://www.osta.org/
  14  *    http://www.ecma.ch/
  15  *    http://www.iso.org/
  16  *
  17  * COPYRIGHT
  18  *  This file is distributed under the terms of the GNU General Public
  19  *  License (GPL). Copies of the GPL can be obtained from:
  20  *    ftp://prep.ai.mit.edu/pub/gnu/GPL
  21  *  Each contributing author retains all rights to their own work.
  22  *
  23  *  (C) 1998 Dave Boynton
  24  *  (C) 1998-2004 Ben Fennema
  25  *  (C) 2000 Stelias Computing Inc
  26  *
  27  * HISTORY
  28  *
  29  *  09/24/98 dgb  changed to allow compiling outside of kernel, and
  30  *                added some debugging.
  31  *  10/01/98 dgb  updated to allow (some) possibility of compiling w/2.0.34
  32  *  10/16/98      attempting some multi-session support
  33  *  10/17/98      added freespace count for "df"
  34  *  11/11/98 gr   added novrs option
  35  *  11/26/98 dgb  added fileset,anchor mount options
  36  *  12/06/98 blf  really hosed things royally. vat/sparing support. sequenced
  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 <linux/mount.h>
  57 #include <linux/seq_file.h>
  58 #include <linux/bitmap.h>
  59 #include <asm/byteorder.h>
  60
  61 #include "udf_sb.h"
  62 #include "udf_i.h"
  63
  64 #include <linux/init.h>
  65 #include <asm/uaccess.h>
  66
  67 #define VDS_POS_PRIMARY_VOL_DESC        0
  68 #define VDS_POS_UNALLOC_SPACE_DESC      1
  69 #define VDS_POS_LOGICAL_VOL_DESC        2
  70 #define VDS_POS_PARTITION_DESC          3
  71 #define VDS_POS_IMP_USE_VOL_DESC        4
  72 #define VDS_POS_VOL_DESC_PTR            5
  73 #define VDS_POS_TERMINATING_DESC        6
  74 #define VDS_POS_LENGTH                  7
  75
  76 #define UDF_DEFAULT_BLOCKSIZE 2048
  77
  78 static char error_buf[1024];
  79
  80 /* These are the "meat" - everything else is stuffing */
  81 static int udf_fill_super(struct super_block *, void *, int);
  82 static void udf_put_super(struct super_block *);
  83 static void udf_write_super(struct super_block *);
  84 static int udf_remount_fs(struct super_block *, int *, char *);
  85 static int udf_check_valid(struct super_block *, int, int);
  86 static int udf_vrs(struct super_block *sb, int silent);
  87 static void udf_load_logicalvolint(struct super_block *, kernel_extent_ad);
  88 static void udf_find_anchor(struct super_block *);
  89 static int udf_find_fileset(struct super_block *, kernel_lb_addr *,
  90                             kernel_lb_addr *);
  91 static void udf_load_fileset(struct super_block *, struct buffer_head *,
  92                              kernel_lb_addr *);
  93 static void udf_open_lvid(struct super_block *);
  94 static void udf_close_lvid(struct super_block *);
  95 static unsigned int udf_count_free(struct super_block *);
  96 static int udf_statfs(struct dentry *, struct kstatfs *);
  97 static int udf_show_options(struct seq_file *, struct vfsmount *);
  98 static void udf_error(struct super_block *sb, const char *function,
  99                       const char *fmt, ...);
 100
 101 struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct udf_sb_info *sbi)
 102 {
 103         struct logicalVolIntegrityDesc *lvid =
 104                 (struct logicalVolIntegrityDesc *)sbi->s_lvid_bh->b_data;
 105         __u32 number_of_partitions = le32_to_cpu(lvid->numOfPartitions);
 106         __u32 offset = number_of_partitions * 2 *
 107                                 sizeof(uint32_t)/sizeof(uint8_t);
 108         return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
 109 }
 110
 111 /* UDF filesystem type */
 112 static int udf_get_sb(struct file_system_type *fs_type,
 113                       int flags, const char *dev_name, void *data,
 114                       struct vfsmount *mnt)
 115 {
 116         return get_sb_bdev(fs_type, flags, dev_name, data, udf_fill_super, mnt);
 117 }
 118
 119 static struct file_system_type udf_fstype = {
 120         .owner          = THIS_MODULE,
 121         .name           = "udf",
 122         .get_sb         = udf_get_sb,
 123         .kill_sb        = kill_block_super,
 124         .fs_flags       = FS_REQUIRES_DEV,
 125 };
 126
 127 static struct kmem_cache *udf_inode_cachep;
 128
 129 static struct inode *udf_alloc_inode(struct super_block *sb)
 130 {
 131         struct udf_inode_info *ei;
 132         ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
 133         if (!ei)
 134                 return NULL;
 135
 136         ei->i_unique = 0;
 137         ei->i_lenExtents = 0;
 138         ei->i_next_alloc_block = 0;
 139         ei->i_next_alloc_goal = 0;
 140         ei->i_strat4096 = 0;
 141
 142         return &ei->vfs_inode;
 143 }
 144
 145 static void udf_destroy_inode(struct inode *inode)
 146 {
 147         kmem_cache_free(udf_inode_cachep, UDF_I(inode));
 148 }
 149
 150 static void init_once(struct kmem_cache *cachep, void *foo)
 151 {
 152         struct udf_inode_info *ei = (struct udf_inode_info *)foo;
 153
 154         ei->i_ext.i_data = NULL;
 155         inode_init_once(&ei->vfs_inode);
 156 }
 157
 158 static int init_inodecache(void)
 159 {
 160         udf_inode_cachep = kmem_cache_create("udf_inode_cache",
 161                                              sizeof(struct udf_inode_info),
 162                                              0, (SLAB_RECLAIM_ACCOUNT |
 163                                                  SLAB_MEM_SPREAD),
 164                                              init_once);
 165         if (!udf_inode_cachep)
 166                 return -ENOMEM;
 167         return 0;
 168 }
 169
 170 static void destroy_inodecache(void)
 171 {
 172         kmem_cache_destroy(udf_inode_cachep);
 173 }
 174
 175 /* Superblock operations */
 176 static const struct super_operations udf_sb_ops = {
 177         .alloc_inode    = udf_alloc_inode,
 178         .destroy_inode  = udf_destroy_inode,
 179         .write_inode    = udf_write_inode,
 180         .delete_inode   = udf_delete_inode,
 181         .clear_inode    = udf_clear_inode,
 182         .put_super      = udf_put_super,
 183         .write_super    = udf_write_super,
 184         .statfs         = udf_statfs,
 185         .remount_fs     = udf_remount_fs,
 186         .show_options   = udf_show_options,
 187 };
 188
 189 struct udf_options {
 190         unsigned char novrs;
 191         unsigned int blocksize;
 192         unsigned int session;
 193         unsigned int lastblock;
 194         unsigned int anchor;
 195         unsigned int volume;
 196         unsigned short partition;
 197         unsigned int fileset;
 198         unsigned int rootdir;
 199         unsigned int flags;
 200         mode_t umask;
 201         gid_t gid;
 202         uid_t uid;
 203         struct nls_table *nls_map;
 204 };
 205
 206 static int __init init_udf_fs(void)
 207 {
 208         int err;
 209
 210         err = init_inodecache();
 211         if (err)
 212                 goto out1;
 213         err = register_filesystem(&udf_fstype);
 214         if (err)
 215                 goto out;
 216
 217         return 0;
 218
 219 out:
 220         destroy_inodecache();
 221
 222 out1:
 223         return err;
 224 }
 225
 226 static void __exit exit_udf_fs(void)
 227 {
 228         unregister_filesystem(&udf_fstype);
 229         destroy_inodecache();
 230 }
 231
 232 module_init(init_udf_fs)
 233 module_exit(exit_udf_fs)
 234
 235 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
 236 {
 237         struct udf_sb_info *sbi = UDF_SB(sb);
 238
 239         sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map),
 240                                   GFP_KERNEL);
 241         if (!sbi->s_partmaps) {
 242                 udf_error(sb, __FUNCTION__,
 243                           "Unable to allocate space for %d partition maps",
 244                           count);
 245                 sbi->s_partitions = 0;
 246                 return -ENOMEM;
 247         }
 248
 249         sbi->s_partitions = count;
 250         return 0;
 251 }
 252
 253 static int udf_show_options(struct seq_file *seq, struct vfsmount *mnt)
 254 {
 255         struct super_block *sb = mnt->mnt_sb;
 256         struct udf_sb_info *sbi = UDF_SB(sb);
 257
 258         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
 259                 seq_puts(seq, ",nostrict");
 260         if (sb->s_blocksize != UDF_DEFAULT_BLOCKSIZE)
 261                 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
 262         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
 263                 seq_puts(seq, ",unhide");
 264         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
 265                 seq_puts(seq, ",undelete");
 266         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
 267                 seq_puts(seq, ",noadinicb");
 268         if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
 269                 seq_puts(seq, ",shortad");
 270         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
 271                 seq_puts(seq, ",uid=forget");
 272         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_IGNORE))
 273                 seq_puts(seq, ",uid=ignore");
 274         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
 275                 seq_puts(seq, ",gid=forget");
 276         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE))
 277                 seq_puts(seq, ",gid=ignore");
 278         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
 279                 seq_printf(seq, ",uid=%u", sbi->s_uid);
 280         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
 281                 seq_printf(seq, ",gid=%u", sbi->s_gid);
 282         if (sbi->s_umask != 0)
 283                 seq_printf(seq, ",umask=%o", sbi->s_umask);
 284         if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
 285                 seq_printf(seq, ",session=%u", sbi->s_session);
 286         if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
 287                 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
 288         /*
 289          * s_anchor[2] could be zeroed out in case there is no anchor
 290          * in the specified block, but then the "anchor=N" option
 291          * originally given by the user wasn't effective, so it's OK
 292          * if we don't show it.
 293          */
 294         if (sbi->s_anchor[2] != 0)
 295                 seq_printf(seq, ",anchor=%u", sbi->s_anchor[2]);
 296         /*
 297          * volume, partition, fileset and rootdir seem to be ignored
 298          * currently
 299          */
 300         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
 301                 seq_puts(seq, ",utf8");
 302         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
 303                 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
 304
 305         return 0;
 306 }
 307
 308 /*
 309  * udf_parse_options
 310  *
 311  * PURPOSE
 312  *      Parse mount options.
 313  *
 314  * DESCRIPTION
 315  *      The following mount options are supported:
 316  *
 317  *      gid=            Set the default group.
 318  *      umask=          Set the default umask.
 319  *      uid=            Set the default user.
 320  *      bs=             Set the block size.
 321  *      unhide          Show otherwise hidden files.
 322  *      undelete        Show deleted files in lists.
 323  *      adinicb         Embed data in the inode (default)
 324  *      noadinicb       Don't embed data in the inode
 325  *      shortad         Use short ad's
 326  *      longad          Use long ad's (default)
 327  *      nostrict        Unset strict conformance
 328  *      iocharset=      Set the NLS character set
 329  *
 330  *      The remaining are for debugging and disaster recovery:
 331  *
 332  *      novrs           Skip volume sequence recognition
 333  *
 334  *      The following expect a offset from 0.
 335  *
 336  *      session=        Set the CDROM session (default= last session)
 337  *      anchor=         Override standard anchor location. (default= 256)
 338  *      volume=         Override the VolumeDesc location. (unused)
 339  *      partition=      Override the PartitionDesc location. (unused)
 340  *      lastblock=      Set the last block of the filesystem/
 341  *
 342  *      The following expect a offset from the partition root.
 343  *
 344  *      fileset=        Override the fileset block location. (unused)
 345  *      rootdir=        Override the root directory location. (unused)
 346  *              WARNING: overriding the rootdir to a non-directory may
 347  *              yield highly unpredictable results.
 348  *
 349  * PRE-CONDITIONS
 350  *      options         Pointer to mount options string.
 351  *      uopts           Pointer to mount options variable.
 352  *
 353  * POST-CONDITIONS
 354  *      <return>        1       Mount options parsed okay.
 355  *      <return>        0       Error parsing mount options.
 356  *
 357  * HISTORY
 358  *      July 1, 1997 - Andrew E. Mileski
 359  *      Written, tested, and released.
 360  */
 361
 362 enum {
 363         Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
 364         Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
 365         Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
 366         Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
 367         Opt_rootdir, Opt_utf8, Opt_iocharset,
 368         Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore
 369 };
 370
 371 static match_table_t tokens = {
 372         {Opt_novrs,     "novrs"},
 373         {Opt_nostrict,  "nostrict"},
 374         {Opt_bs,        "bs=%u"},
 375         {Opt_unhide,    "unhide"},
 376         {Opt_undelete,  "undelete"},
 377         {Opt_noadinicb, "noadinicb"},
 378         {Opt_adinicb,   "adinicb"},
 379         {Opt_shortad,   "shortad"},
 380         {Opt_longad,    "longad"},
 381         {Opt_uforget,   "uid=forget"},
 382         {Opt_uignore,   "uid=ignore"},
 383         {Opt_gforget,   "gid=forget"},
 384         {Opt_gignore,   "gid=ignore"},
 385         {Opt_gid,       "gid=%u"},
 386         {Opt_uid,       "uid=%u"},
 387         {Opt_umask,     "umask=%o"},
 388         {Opt_session,   "session=%u"},
 389         {Opt_lastblock, "lastblock=%u"},
 390         {Opt_anchor,    "anchor=%u"},
 391         {Opt_volume,    "volume=%u"},
 392         {Opt_partition, "partition=%u"},
 393         {Opt_fileset,   "fileset=%u"},
 394         {Opt_rootdir,   "rootdir=%u"},
 395         {Opt_utf8,      "utf8"},
 396         {Opt_iocharset, "iocharset=%s"},
 397         {Opt_err,       NULL}
 398 };
 399
 400 static int udf_parse_options(char *options, struct udf_options *uopt,
 401                              bool remount)
 402 {
 403         char *p;
 404         int option;
 405
 406         uopt->novrs = 0;
 407         uopt->blocksize = UDF_DEFAULT_BLOCKSIZE;
 408         uopt->partition = 0xFFFF;
 409         uopt->session = 0xFFFFFFFF;
 410         uopt->lastblock = 0;
 411         uopt->anchor = 0;
 412         uopt->volume = 0xFFFFFFFF;
 413         uopt->rootdir = 0xFFFFFFFF;
 414         uopt->fileset = 0xFFFFFFFF;
 415         uopt->nls_map = NULL;
 416
 417         if (!options)
 418                 return 1;
 419
 420         while ((p = strsep(&options, ",")) != NULL) {
 421                 substring_t args[MAX_OPT_ARGS];
 422                 int token;
 423                 if (!*p)
 424                         continue;
 425
 426                 token = match_token(p, tokens, args);
 427                 switch (token) {
 428                 case Opt_novrs:
 429                         uopt->novrs = 1;
 430                 case Opt_bs:
 431                         if (match_int(&args[0], &option))
 432                                 return 0;
 433                         uopt->blocksize = option;
 434                         break;
 435                 case Opt_unhide:
 436                         uopt->flags |= (1 << UDF_FLAG_UNHIDE);
 437                         break;
 438                 case Opt_undelete:
 439                         uopt->flags |= (1 << UDF_FLAG_UNDELETE);
 440                         break;
 441                 case Opt_noadinicb:
 442                         uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
 443                         break;
 444                 case Opt_adinicb:
 445                         uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
 446                         break;
 447                 case Opt_shortad:
 448                         uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
 449                         break;
 450                 case Opt_longad:
 451                         uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
 452                         break;
 453                 case Opt_gid:
 454                         if (match_int(args, &option))
 455                                 return 0;
 456                         uopt->gid = option;
 457                         uopt->flags |= (1 << UDF_FLAG_GID_SET);
 458                         break;
 459                 case Opt_uid:
 460                         if (match_int(args, &option))
 461                                 return 0;
 462                         uopt->uid = option;
 463                         uopt->flags |= (1 << UDF_FLAG_UID_SET);
 464                         break;
 465                 case Opt_umask:
 466                         if (match_octal(args, &option))
 467                                 return 0;
 468                         uopt->umask = option;
 469                         break;
 470                 case Opt_nostrict:
 471                         uopt->flags &= ~(1 << UDF_FLAG_STRICT);
 472                         break;
 473                 case Opt_session:
 474                         if (match_int(args, &option))
 475                                 return 0;
 476                         uopt->session = option;
 477                         if (!remount)
 478                                 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
 479                         break;
 480                 case Opt_lastblock:
 481                         if (match_int(args, &option))
 482                                 return 0;
 483                         uopt->lastblock = option;
 484                         if (!remount)
 485                                 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
 486                         break;
 487                 case Opt_anchor:
 488                         if (match_int(args, &option))
 489                                 return 0;
 490                         uopt->anchor = option;
 491                         break;
 492                 case Opt_volume:
 493                         if (match_int(args, &option))
 494                                 return 0;
 495                         uopt->volume = option;
 496                         break;
 497                 case Opt_partition:
 498                         if (match_int(args, &option))
 499                                 return 0;
 500                         uopt->partition = option;
 501                         break;
 502                 case Opt_fileset:
 503                         if (match_int(args, &option))
 504                                 return 0;
 505                         uopt->fileset = option;
 506                         break;
 507                 case Opt_rootdir:
 508                         if (match_int(args, &option))
 509                                 return 0;
 510                         uopt->rootdir = option;
 511                         break;
 512                 case Opt_utf8:
 513                         uopt->flags |= (1 << UDF_FLAG_UTF8);
 514                         break;
 515 #ifdef CONFIG_UDF_NLS
 516                 case Opt_iocharset:
 517                         uopt->nls_map = load_nls(args[0].from);
 518                         uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
 519                         break;
 520 #endif
 521                 case Opt_uignore:
 522                         uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
 523                         break;
 524                 case Opt_uforget:
 525                         uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
 526                         break;
 527                 case Opt_gignore:
 528                         uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
 529                         break;
 530                 case Opt_gforget:
 531                         uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
 532                         break;
 533                 default:
 534                         printk(KERN_ERR "udf: bad mount option \"%s\" "
 535                                "or missing value\n", p);
 536                         return 0;
 537                 }
 538         }
 539         return 1;
 540 }
 541
 542 static void udf_write_super(struct super_block *sb)
 543 {
 544         lock_kernel();
 545
 546         if (!(sb->s_flags & MS_RDONLY))
 547                 udf_open_lvid(sb);
 548         sb->s_dirt = 0;
 549
 550         unlock_kernel();
 551 }
 552
 553 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
 554 {
 555         struct udf_options uopt;
 556         struct udf_sb_info *sbi = UDF_SB(sb);
 557
 558         uopt.flags = sbi->s_flags;
 559         uopt.uid   = sbi->s_uid;
 560         uopt.gid   = sbi->s_gid;
 561         uopt.umask = sbi->s_umask;
 562
 563         if (!udf_parse_options(options, &uopt, true))
 564                 return -EINVAL;
 565
 566         sbi->s_flags = uopt.flags;
 567         sbi->s_uid   = uopt.uid;
 568         sbi->s_gid   = uopt.gid;
 569         sbi->s_umask = uopt.umask;
 570
 571         if (sbi->s_lvid_bh) {
 572                 int write_rev = le16_to_cpu(udf_sb_lvidiu(sbi)->minUDFWriteRev);
 573                 if (write_rev > UDF_MAX_WRITE_VERSION)
 574                         *flags |= MS_RDONLY;
 575         }
 576
 577         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 578                 return 0;
 579         if (*flags & MS_RDONLY)
 580                 udf_close_lvid(sb);
 581         else
 582                 udf_open_lvid(sb);
 583
 584         return 0;
 585 }
 586
 587 static int udf_vrs(struct super_block *sb, int silent)
 588 {
 589         struct volStructDesc *vsd = NULL;
 590         int sector = 32768;
 591         int sectorsize;
 592         struct buffer_head *bh = NULL;
 593         int iso9660 = 0;
 594         int nsr02 = 0;
 595         int nsr03 = 0;
 596         struct udf_sb_info *sbi;
 597
 598         /* Block size must be a multiple of 512 */
 599         if (sb->s_blocksize & 511)
 600                 return 0;
 601         sbi = UDF_SB(sb);
 602
 603         if (sb->s_blocksize < sizeof(struct volStructDesc))
 604                 sectorsize = sizeof(struct volStructDesc);
 605         else
 606                 sectorsize = sb->s_blocksize;
 607
 608         sector += (sbi->s_session << sb->s_blocksize_bits);
 609
 610         udf_debug("Starting at sector %u (%ld byte sectors)\n",
 611                   (sector >> sb->s_blocksize_bits), sb->s_blocksize);
 612         /* Process the sequence (if applicable) */
 613         for (; !nsr02 && !nsr03; sector += sectorsize) {
 614                 /* Read a block */
 615                 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
 616                 if (!bh)
 617                         break;
 618
 619                 /* Look for ISO  descriptors */
 620                 vsd = (struct volStructDesc *)(bh->b_data +
 621                                               (sector & (sb->s_blocksize - 1)));
 622
 623                 if (vsd->stdIdent[0] == 0) {
 624                         brelse(bh);
 625                         break;
 626                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
 627                                     VSD_STD_ID_LEN)) {
 628                         iso9660 = sector;
 629                         switch (vsd->structType) {
 630                         case 0:
 631                                 udf_debug("ISO9660 Boot Record found\n");
 632                                 break;
 633                         case 1:
 634                                 udf_debug("ISO9660 Primary Volume Descriptor "
 635                                           "found\n");
 636                                 break;
 637                         case 2:
 638                                 udf_debug("ISO9660 Supplementary Volume "
 639                                           "Descriptor found\n");
 640                                 break;
 641                         case 3:
 642                                 udf_debug("ISO9660 Volume Partition Descriptor "
 643                                           "found\n");
 644                                 break;
 645                         case 255:
 646                                 udf_debug("ISO9660 Volume Descriptor Set "
 647                                           "Terminator found\n");
 648                                 break;
 649                         default:
 650                                 udf_debug("ISO9660 VRS (%u) found\n",
 651                                           vsd->structType);
 652                                 break;
 653                         }
 654                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
 655                                     VSD_STD_ID_LEN))
 656                         ; /* nothing */
 657                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
 658                                     VSD_STD_ID_LEN)) {
 659                         brelse(bh);
 660                         break;
 661                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
 662                                     VSD_STD_ID_LEN))
 663                         nsr02 = sector;
 664                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
 665                                     VSD_STD_ID_LEN))
 666                         nsr03 = sector;
 667                 brelse(bh);
 668         }
 669
 670         if (nsr03)
 671                 return nsr03;
 672         else if (nsr02)
 673                 return nsr02;
 674         else if (sector - (sbi->s_session << sb->s_blocksize_bits) == 32768)
 675                 return -1;
 676         else
 677                 return 0;
 678 }
 679
 680 /*
 681  * Check whether there is an anchor block in the given block
 682  */
 683 static int udf_check_anchor_block(struct super_block *sb, sector_t block,
 684                                         bool varconv)
 685 {
 686         struct buffer_head *bh = NULL;
 687         tag *t;
 688         uint16_t ident;
 689         uint32_t location;
 690
 691         if (varconv) {
 692                 if (udf_fixed_to_variable(block) >=
 693                     sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits)
 694                         return 0;
 695                 bh = sb_bread(sb, udf_fixed_to_variable(block));
 696         }
 697         else
 698                 bh = sb_bread(sb, block);
 699
 700         if (!bh)
 701                 return 0;
 702
 703         t = (tag *)bh->b_data;
 704         ident = le16_to_cpu(t->tagIdent);
 705         location = le32_to_cpu(t->tagLocation);
 706         brelse(bh);
 707         if (ident != TAG_IDENT_AVDP)
 708                 return 0;
 709         return location == block;
 710 }
 711
 712 /* Search for an anchor volume descriptor pointer */
 713 static sector_t udf_scan_anchors(struct super_block *sb, bool varconv,
 714                                         sector_t lastblock)
 715 {
 716         sector_t last[6];
 717         int i;
 718         struct udf_sb_info *sbi = UDF_SB(sb);
 719
 720         last[0] = lastblock;
 721         last[1] = last[0] - 1;
 722         last[2] = last[0] + 1;
 723         last[3] = last[0] - 2;
 724         last[4] = last[0] - 150;
 725         last[5] = last[0] - 152;
 726
 727         /*  according to spec, anchor is in either:
 728          *     block 256
 729          *     lastblock-256
 730          *     lastblock
 731          *  however, if the disc isn't closed, it could be 512 */
 732
 733         for (i = 0; i < ARRAY_SIZE(last); i++) {
 734                 if (last[i] < 0)
 735                         continue;
 736                 if (last[i] >= sb->s_bdev->bd_inode->i_size >>
 737                                 sb->s_blocksize_bits)
 738                         continue;
 739
 740                 if (udf_check_anchor_block(sb, last[i], varconv)) {
 741                         sbi->s_anchor[0] = last[i];
 742                         sbi->s_anchor[1] = last[i] - 256;
 743                         return last[i];
 744                 }
 745
 746                 if (last[i] < 256)
 747                         continue;
 748
 749                 if (udf_check_anchor_block(sb, last[i] - 256, varconv)) {
 750                         sbi->s_anchor[1] = last[i] - 256;
 751                         return last[i];
 752                 }
 753         }
 754
 755         if (udf_check_anchor_block(sb, sbi->s_session + 256, varconv)) {
 756                 sbi->s_anchor[0] = sbi->s_session + 256;
 757                 return last[0];
 758         }
 759         if (udf_check_anchor_block(sb, sbi->s_session + 512, varconv)) {
 760                 sbi->s_anchor[0] = sbi->s_session + 512;
 761                 return last[0];
 762         }
 763         return 0;
 764 }
 765
 766 /*
 767  * Find an anchor volume descriptor. The function expects sbi->s_lastblock to
 768  * be the last block on the media.
 769  *
 770  * Return 1 if not found, 0 if ok
 771  *
 772  */
 773 static void udf_find_anchor(struct super_block *sb)
 774 {
 775         sector_t lastblock;
 776         struct buffer_head *bh = NULL;
 777         uint16_t ident;
 778         int i;
 779         struct udf_sb_info *sbi = UDF_SB(sb);
 780
 781         lastblock = udf_scan_anchors(sb, 0, sbi->s_last_block);
 782         if (lastblock)
 783                 goto check_anchor;
 784
 785         /* No anchor found? Try VARCONV conversion of block numbers */
 786         /* Firstly, we try to not convert number of the last block */
 787         lastblock = udf_scan_anchors(sb, 1,
 788                                 udf_variable_to_fixed(sbi->s_last_block));
 789         if (lastblock) {
 790                 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
 791                 goto check_anchor;
 792         }
 793
 794         /* Secondly, we try with converted number of the last block */
 795         lastblock = udf_scan_anchors(sb, 1, sbi->s_last_block);
 796         if (lastblock)
 797                 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
 798
 799 check_anchor:
 800         /*
 801          * Check located anchors and the anchor block supplied via
 802          * mount options
 803          */
 804         for (i = 0; i < ARRAY_SIZE(sbi->s_anchor); i++) {
 805                 if (!sbi->s_anchor[i])
 806                         continue;
 807                 bh = udf_read_tagged(sb, sbi->s_anchor[i],
 808                                         sbi->s_anchor[i], &ident);
 809                 if (!bh)
 810                         sbi->s_anchor[i] = 0;
 811                 else {
 812                         brelse(bh);
 813                         if (ident != TAG_IDENT_AVDP)
 814                                 sbi->s_anchor[i] = 0;
 815                 }
 816         }
 817
 818         sbi->s_last_block = lastblock;
 819 }
 820
 821 static int udf_find_fileset(struct super_block *sb,
 822                             kernel_lb_addr *fileset,
 823                             kernel_lb_addr *root)
 824 {
 825         struct buffer_head *bh = NULL;
 826         long lastblock;
 827         uint16_t ident;
 828         struct udf_sb_info *sbi;
 829
 830         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
 831             fileset->partitionReferenceNum != 0xFFFF) {
 832                 bh = udf_read_ptagged(sb, *fileset, 0, &ident);
 833
 834                 if (!bh) {
 835                         return 1;
 836                 } else if (ident != TAG_IDENT_FSD) {
 837                         brelse(bh);
 838                         return 1;
 839                 }
 840
 841         }
 842
 843         sbi = UDF_SB(sb);
 844         if (!bh) {
 845                 /* Search backwards through the partitions */
 846                 kernel_lb_addr newfileset;
 847
 848 /* --> cvg: FIXME - is it reasonable? */
 849                 return 1;
 850
 851                 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
 852                      (newfileset.partitionReferenceNum != 0xFFFF &&
 853                       fileset->logicalBlockNum == 0xFFFFFFFF &&
 854                       fileset->partitionReferenceNum == 0xFFFF);
 855                      newfileset.partitionReferenceNum--) {
 856                         lastblock = sbi->s_partmaps
 857                                         [newfileset.partitionReferenceNum]
 858                                                 .s_partition_len;
 859                         newfileset.logicalBlockNum = 0;
 860
 861                         do {
 862                                 bh = udf_read_ptagged(sb, newfileset, 0,
 863                                                       &ident);
 864                                 if (!bh) {
 865                                         newfileset.logicalBlockNum++;
 866                                         continue;
 867                                 }
 868
 869                                 switch (ident) {
 870                                 case TAG_IDENT_SBD:
 871                                 {
 872                                         struct spaceBitmapDesc *sp;
 873                                         sp = (struct spaceBitmapDesc *)
 874                                                                 bh->b_data;
 875                                         newfileset.logicalBlockNum += 1 +
 876                                                 ((le32_to_cpu(sp->numOfBytes) +
 877                                                   sizeof(struct spaceBitmapDesc)
 878                                                   - 1) >> sb->s_blocksize_bits);
 879                                         brelse(bh);
 880                                         break;
 881                                 }
 882                                 case TAG_IDENT_FSD:
 883                                         *fileset = newfileset;
 884                                         break;
 885                                 default:
 886                                         newfileset.logicalBlockNum++;
 887                                         brelse(bh);
 888                                         bh = NULL;
 889                                         break;
 890                                 }
 891                         } while (newfileset.logicalBlockNum < lastblock &&
 892                                  fileset->logicalBlockNum == 0xFFFFFFFF &&
 893                                  fileset->partitionReferenceNum == 0xFFFF);
 894                 }
 895         }
 896
 897         if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
 898              fileset->partitionReferenceNum != 0xFFFF) && bh) {
 899                 udf_debug("Fileset at block=%d, partition=%d\n",
 900                           fileset->logicalBlockNum,
 901                           fileset->partitionReferenceNum);
 902
 903                 sbi->s_partition = fileset->partitionReferenceNum;
 904                 udf_load_fileset(sb, bh, root);
 905                 brelse(bh);
 906                 return 0;
 907         }
 908         return 1;
 909 }
 910
 911 static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
 912 {
 913         struct primaryVolDesc *pvoldesc;
 914         struct ustr instr;
 915         struct ustr outstr;
 916         struct buffer_head *bh;
 917         uint16_t ident;
 918
 919         bh = udf_read_tagged(sb, block, block, &ident);
 920         if (!bh)
 921                 return 1;
 922         BUG_ON(ident != TAG_IDENT_PVD);
 923
 924         pvoldesc = (struct primaryVolDesc *)bh->b_data;
 925
 926         if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
 927                               pvoldesc->recordingDateAndTime)) {
 928 #ifdef UDFFS_DEBUG
 929                 timestamp *ts = &pvoldesc->recordingDateAndTime;
 930                 udf_debug("recording time %04u/%02u/%02u"
 931                           " %02u:%02u (%x)\n",
 932                           le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
 933                           ts->minute, le16_to_cpu(ts->typeAndTimezone));
 934 #endif
 935         }
 936
 937         if (!udf_build_ustr(&instr, pvoldesc->volIdent, 32))
 938                 if (udf_CS0toUTF8(&outstr, &instr)) {
 939                         strncpy(UDF_SB(sb)->s_volume_ident, outstr.u_name,
 940                                 outstr.u_len > 31 ? 31 : outstr.u_len);
 941                         udf_debug("volIdent[] = '%s'\n",
 942                                         UDF_SB(sb)->s_volume_ident);
 943                 }
 944
 945         if (!udf_build_ustr(&instr, pvoldesc->volSetIdent, 128))
 946                 if (udf_CS0toUTF8(&outstr, &instr))
 947                         udf_debug("volSetIdent[] = '%s'\n", outstr.u_name);
 948
 949         brelse(bh);
 950         return 0;
 951 }
 952
 953 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
 954                              kernel_lb_addr *root)
 955 {
 956         struct fileSetDesc *fset;
 957
 958         fset = (struct fileSetDesc *)bh->b_data;
 959
 960         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
 961
 962         UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
 963
 964         udf_debug("Rootdir at block=%d, partition=%d\n",
 965                   root->logicalBlockNum, root->partitionReferenceNum);
 966 }
 967
 968 int udf_compute_nr_groups(struct super_block *sb, u32 partition)
 969 {
 970         struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
 971         return DIV_ROUND_UP(map->s_partition_len +
 972                             (sizeof(struct spaceBitmapDesc) << 3),
 973                             sb->s_blocksize * 8);
 974 }
 975
 976 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
 977 {
 978         struct udf_bitmap *bitmap;
 979         int nr_groups;
 980         int size;
 981
 982         nr_groups = udf_compute_nr_groups(sb, index);
 983         size = sizeof(struct udf_bitmap) +
 984                 (sizeof(struct buffer_head *) * nr_groups);
 985
 986         if (size <= PAGE_SIZE)
 987                 bitmap = kmalloc(size, GFP_KERNEL);
 988         else
 989                 bitmap = vmalloc(size); /* TODO: get rid of vmalloc */
 990
 991         if (bitmap == NULL) {
 992                 udf_error(sb, __FUNCTION__,
 993                           "Unable to allocate space for bitmap "
 994                           "and %d buffer_head pointers", nr_groups);
 995                 return NULL;
 996         }
 997
 998         memset(bitmap, 0x00, size);
 999         bitmap->s_block_bitmap = (struct buffer_head **)(bitmap + 1);
1000         bitmap->s_nr_groups = nr_groups;
1001         return bitmap;
1002 }
1003
1004 static int udf_fill_partdesc_info(struct super_block *sb,
1005                 struct partitionDesc *p, int p_index)
1006 {
1007         struct udf_part_map *map;
1008         struct udf_sb_info *sbi = UDF_SB(sb);
1009         struct partitionHeaderDesc *phd;
1010
1011         map = &sbi->s_partmaps[p_index];
1012
1013         map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
1014         map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
1015
1016         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
1017                 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
1018         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
1019                 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
1020         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
1021                 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
1022         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
1023                 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
1024
1025         udf_debug("Partition (%d:%d type %x) starts at physical %d, "
1026                   "block length %d\n", partitionNumber, p_index,
1027                   map->s_partition_type, map->s_partition_root,
1028                   map->s_partition_len);
1029
1030         if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1031             strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
1032                 return 0;
1033
1034         phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1035         if (phd->unallocSpaceTable.extLength) {
1036                 kernel_lb_addr loc = {
1037                         .logicalBlockNum = le32_to_cpu(
1038                                 phd->unallocSpaceTable.extPosition),
1039                         .partitionReferenceNum = p_index,
1040                 };
1041
1042                 map->s_uspace.s_table = udf_iget(sb, loc);
1043                 if (!map->s_uspace.s_table) {
1044                         udf_debug("cannot load unallocSpaceTable (part %d)\n",
1045                                         p_index);
1046                         return 1;
1047                 }
1048                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1049                 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
1050                                 p_index, map->s_uspace.s_table->i_ino);
1051         }
1052
1053         if (phd->unallocSpaceBitmap.extLength) {
1054                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1055                 if (!bitmap)
1056                         return 1;
1057                 map->s_uspace.s_bitmap = bitmap;
1058                 bitmap->s_extLength = le32_to_cpu(
1059                                 phd->unallocSpaceBitmap.extLength);
1060                 bitmap->s_extPosition = le32_to_cpu(
1061                                 phd->unallocSpaceBitmap.extPosition);
1062                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1063                 udf_debug("unallocSpaceBitmap (part %d) @ %d\n", p_index,
1064                                                 bitmap->s_extPosition);
1065         }
1066
1067         if (phd->partitionIntegrityTable.extLength)
1068                 udf_debug("partitionIntegrityTable (part %d)\n", p_index);
1069
1070         if (phd->freedSpaceTable.extLength) {
1071                 kernel_lb_addr loc = {
1072                         .logicalBlockNum = le32_to_cpu(
1073                                 phd->freedSpaceTable.extPosition),
1074                         .partitionReferenceNum = p_index,
1075                 };
1076
1077                 map->s_fspace.s_table = udf_iget(sb, loc);
1078                 if (!map->s_fspace.s_table) {
1079                         udf_debug("cannot load freedSpaceTable (part %d)\n",
1080                                 p_index);
1081                         return 1;
1082                 }
1083
1084                 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
1085                 udf_debug("freedSpaceTable (part %d) @ %ld\n",
1086                                 p_index, map->s_fspace.s_table->i_ino);
1087         }
1088
1089         if (phd->freedSpaceBitmap.extLength) {
1090                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1091                 if (!bitmap)
1092                         return 1;
1093                 map->s_fspace.s_bitmap = bitmap;
1094                 bitmap->s_extLength = le32_to_cpu(
1095                                 phd->freedSpaceBitmap.extLength);
1096                 bitmap->s_extPosition = le32_to_cpu(
1097                                 phd->freedSpaceBitmap.extPosition);
1098                 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1099                 udf_debug("freedSpaceBitmap (part %d) @ %d\n", p_index,
1100                                         bitmap->s_extPosition);
1101         }
1102         return 0;
1103 }
1104
1105 static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1106 {
1107         struct udf_sb_info *sbi = UDF_SB(sb);
1108         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1109         kernel_lb_addr ino;
1110         struct buffer_head *bh;
1111
1112         /* VAT file entry is in the last recorded block */
1113         ino.partitionReferenceNum = type1_index;
1114         ino.logicalBlockNum = sbi->s_last_block - map->s_partition_root;
1115         sbi->s_vat_inode = udf_iget(sb, ino);
1116         if (!sbi->s_vat_inode)
1117                 return 1;
1118
1119         if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1120                 map->s_type_specific.s_virtual.s_start_offset =
1121                         udf_ext0_offset(sbi->s_vat_inode);
1122                 map->s_type_specific.s_virtual.s_num_entries =
1123                         (sbi->s_vat_inode->i_size - 36) >> 2;
1124         } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1125                 uint32_t pos;
1126                 struct virtualAllocationTable20 *vat20;
1127
1128                 pos = udf_block_map(sbi->s_vat_inode, 0);
1129                 bh = sb_bread(sb, pos);
1130                 if (!bh)
1131                         return 1;
1132                 vat20 = (struct virtualAllocationTable20 *)bh->b_data +
1133                                 udf_ext0_offset(sbi->s_vat_inode);
1134                 map->s_type_specific.s_virtual.s_start_offset =
1135                         le16_to_cpu(vat20->lengthHeader) +
1136                         udf_ext0_offset(sbi->s_vat_inode);
1137                 map->s_type_specific.s_virtual.s_num_entries =
1138                         (sbi->s_vat_inode->i_size -
1139                                 map->s_type_specific.s_virtual.
1140                                         s_start_offset) >> 2;
1141                 brelse(bh);
1142         }
1143         return 0;
1144 }
1145
1146 static int udf_load_partdesc(struct super_block *sb, sector_t block)
1147 {
1148         struct buffer_head *bh;
1149         struct partitionDesc *p;
1150         struct udf_part_map *map;
1151         struct udf_sb_info *sbi = UDF_SB(sb);
1152         int i, type1_idx;
1153         uint16_t partitionNumber;
1154         uint16_t ident;
1155         int ret = 0;
1156
1157         bh = udf_read_tagged(sb, block, block, &ident);
1158         if (!bh)
1159                 return 1;
1160         if (ident != TAG_IDENT_PD)
1161                 goto out_bh;
1162
1163         p = (struct partitionDesc *)bh->b_data;
1164         partitionNumber = le16_to_cpu(p->partitionNumber);
1165
1166         /* First scan for TYPE1 and SPARABLE partitions */
1167         for (i = 0; i < sbi->s_partitions; i++) {
1168                 map = &sbi->s_partmaps[i];
1169                 udf_debug("Searching map: (%d == %d)\n",
1170                           map->s_partition_num, partitionNumber);
1171                 if (map->s_partition_num == partitionNumber &&
1172                     (map->s_partition_type == UDF_TYPE1_MAP15 ||
1173                      map->s_partition_type == UDF_SPARABLE_MAP15))
1174                         break;
1175         }
1176
1177         if (i >= sbi->s_partitions) {
1178                 udf_debug("Partition (%d) not found in partition map\n",
1179                           partitionNumber);
1180                 goto out_bh;
1181         }
1182
1183         ret = udf_fill_partdesc_info(sb, p, i);
1184
1185         /*
1186          * Now rescan for VIRTUAL partitions when TYPE1 partitions are
1187          * already set up
1188          */
1189         type1_idx = i;
1190         for (i = 0; i < sbi->s_partitions; i++) {
1191                 map = &sbi->s_partmaps[i];
1192
1193                 if (map->s_partition_num == partitionNumber &&
1194                     (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1195                      map->s_partition_type == UDF_VIRTUAL_MAP20))
1196                         break;
1197         }
1198
1199         if (i >= sbi->s_partitions)
1200                 goto out_bh;
1201
1202         ret = udf_fill_partdesc_info(sb, p, i);
1203         if (ret)
1204                 goto out_bh;
1205
1206         ret = udf_load_vat(sb, i, type1_idx);
1207 out_bh:
1208         /* In case loading failed, we handle cleanup in udf_fill_super */
1209         brelse(bh);
1210         return ret;
1211 }
1212
1213 static int udf_load_logicalvol(struct super_block *sb, sector_t block,
1214                                kernel_lb_addr *fileset)
1215 {
1216         struct logicalVolDesc *lvd;
1217         int i, j, offset;
1218         uint8_t type;
1219         struct udf_sb_info *sbi = UDF_SB(sb);
1220         struct genericPartitionMap *gpm;
1221         uint16_t ident;
1222         struct buffer_head *bh;
1223         int ret = 0;
1224
1225         bh = udf_read_tagged(sb, block, block, &ident);
1226         if (!bh)
1227                 return 1;
1228         BUG_ON(ident != TAG_IDENT_LVD);
1229         lvd = (struct logicalVolDesc *)bh->b_data;
1230
1231         i = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1232         if (i != 0) {
1233                 ret = i;
1234                 goto out_bh;
1235         }
1236
1237         for (i = 0, offset = 0;
1238              i < sbi->s_partitions && offset < le32_to_cpu(lvd->mapTableLength);
1239              i++, offset += gpm->partitionMapLength) {
1240                 struct udf_part_map *map = &sbi->s_partmaps[i];
1241                 gpm = (struct genericPartitionMap *)
1242                                 &(lvd->partitionMaps[offset]);
1243                 type = gpm->partitionMapType;
1244                 if (type == 1) {
1245                         struct genericPartitionMap1 *gpm1 =
1246                                 (struct genericPartitionMap1 *)gpm;
1247                         map->s_partition_type = UDF_TYPE1_MAP15;
1248                         map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1249                         map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1250                         map->s_partition_func = NULL;
1251                 } else if (type == 2) {
1252                         struct udfPartitionMap2 *upm2 =
1253                                                 (struct udfPartitionMap2 *)gpm;
1254                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1255                                                 strlen(UDF_ID_VIRTUAL))) {
1256                                 u16 suf =
1257                                         le16_to_cpu(((__le16 *)upm2->partIdent.
1258                                                         identSuffix)[0]);
1259                                 if (suf < 0x0200) {
1260                                         map->s_partition_type =
1261                                                         UDF_VIRTUAL_MAP15;
1262                                         map->s_partition_func =
1263                                                         udf_get_pblock_virt15;
1264                                 } else {
1265                                         map->s_partition_type =
1266                                                         UDF_VIRTUAL_MAP20;
1267                                         map->s_partition_func =
1268                                                         udf_get_pblock_virt20;
1269                                 }
1270                         } else if (!strncmp(upm2->partIdent.ident,
1271                                                 UDF_ID_SPARABLE,
1272                                                 strlen(UDF_ID_SPARABLE))) {
1273                                 uint32_t loc;
1274                                 struct sparingTable *st;
1275                                 struct sparablePartitionMap *spm =
1276                                         (struct sparablePartitionMap *)gpm;
1277
1278                                 map->s_partition_type = UDF_SPARABLE_MAP15;
1279                                 map->s_type_specific.s_sparing.s_packet_len =
1280                                                 le16_to_cpu(spm->packetLength);
1281                                 for (j = 0; j < spm->numSparingTables; j++) {
1282                                         struct buffer_head *bh2;
1283
1284                                         loc = le32_to_cpu(
1285                                                 spm->locSparingTable[j]);
1286                                         bh2 = udf_read_tagged(sb, loc, loc,
1287                                                              &ident);
1288                                         map->s_type_specific.s_sparing.
1289                                                         s_spar_map[j] = bh2;
1290
1291                                         if (bh2 == NULL)
1292                                                 continue;
1293
1294                                         st = (struct sparingTable *)bh2->b_data;
1295                                         if (ident != 0 || strncmp(
1296                                                 st->sparingIdent.ident,
1297                                                 UDF_ID_SPARING,
1298                                                 strlen(UDF_ID_SPARING))) {
1299                                                 brelse(bh2);
1300                                                 map->s_type_specific.s_sparing.
1301                                                         s_spar_map[j] = NULL;
1302                                         }
1303                                 }
1304                                 map->s_partition_func = udf_get_pblock_spar15;
1305                         } else {
1306                                 udf_debug("Unknown ident: %s\n",
1307                                           upm2->partIdent.ident);
1308                                 continue;
1309                         }
1310                         map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1311                         map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1312                 }
1313                 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1314                           i, map->s_partition_num, type,
1315                           map->s_volumeseqnum);
1316         }
1317
1318         if (fileset) {
1319                 long_ad *la = (long_ad *)&(lvd->logicalVolContentsUse[0]);
1320
1321                 *fileset = lelb_to_cpu(la->extLocation);
1322                 udf_debug("FileSet found in LogicalVolDesc at block=%d, "
1323                           "partition=%d\n", fileset->logicalBlockNum,
1324                           fileset->partitionReferenceNum);
1325         }
1326         if (lvd->integritySeqExt.extLength)
1327                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1328
1329 out_bh:
1330         brelse(bh);
1331         return ret;
1332 }
1333
1334 /*
1335  * udf_load_logicalvolint
1336  *
1337  */
1338 static void udf_load_logicalvolint(struct super_block *sb, kernel_extent_ad loc)
1339 {
1340         struct buffer_head *bh = NULL;
1341         uint16_t ident;
1342         struct udf_sb_info *sbi = UDF_SB(sb);
1343         struct logicalVolIntegrityDesc *lvid;
1344
1345         while (loc.extLength > 0 &&
1346                (bh = udf_read_tagged(sb, loc.extLocation,
1347                                      loc.extLocation, &ident)) &&
1348                ident == TAG_IDENT_LVID) {
1349                 sbi->s_lvid_bh = bh;
1350                 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1351
1352                 if (lvid->nextIntegrityExt.extLength)
1353                         udf_load_logicalvolint(sb,
1354                                 leea_to_cpu(lvid->nextIntegrityExt));
1355
1356                 if (sbi->s_lvid_bh != bh)
1357                         brelse(bh);
1358                 loc.extLength -= sb->s_blocksize;
1359                 loc.extLocation++;
1360         }
1361         if (sbi->s_lvid_bh != bh)
1362                 brelse(bh);
1363 }
1364
1365 /*
1366  * udf_process_sequence
1367  *
1368  * PURPOSE
1369  *      Process a main/reserve volume descriptor sequence.
1370  *
1371  * PRE-CONDITIONS
1372  *      sb                      Pointer to _locked_ superblock.
1373  *      block                   First block of first extent of the sequence.
1374  *      lastblock               Lastblock of first extent of the sequence.
1375  *
1376  * HISTORY
1377  *      July 1, 1997 - Andrew E. Mileski
1378  *      Written, tested, and released.
1379  */
1380 static noinline int udf_process_sequence(struct super_block *sb, long block,
1381                                 long lastblock, kernel_lb_addr *fileset)
1382 {
1383         struct buffer_head *bh = NULL;
1384         struct udf_vds_record vds[VDS_POS_LENGTH];
1385         struct udf_vds_record *curr;
1386         struct generic_desc *gd;
1387         struct volDescPtr *vdp;
1388         int done = 0;
1389         uint32_t vdsn;
1390         uint16_t ident;
1391         long next_s = 0, next_e = 0;
1392
1393         memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1394
1395         /*
1396          * Read the main descriptor sequence and find which descriptors
1397          * are in it.
1398          */
1399         for (; (!done && block <= lastblock); block++) {
1400
1401                 bh = udf_read_tagged(sb, block, block, &ident);
1402                 if (!bh) {
1403                         printk(KERN_ERR "udf: Block %Lu of volume descriptor "
1404                                "sequence is corrupted or we could not read "
1405                                "it.\n", (unsigned long long)block);
1406                         return 1;
1407                 }
1408
1409                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1410                 gd = (struct generic_desc *)bh->b_data;
1411                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1412                 switch (ident) {
1413                 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1414                         curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1415                         if (vdsn >= curr->volDescSeqNum) {
1416                                 curr->volDescSeqNum = vdsn;
1417                                 curr->block = block;
1418                         }
1419                         break;
1420                 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1421                         curr = &vds[VDS_POS_VOL_DESC_PTR];
1422                         if (vdsn >= curr->volDescSeqNum) {
1423                                 curr->volDescSeqNum = vdsn;
1424                                 curr->block = block;
1425
1426                                 vdp = (struct volDescPtr *)bh->b_data;
1427                                 next_s = le32_to_cpu(
1428                                         vdp->nextVolDescSeqExt.extLocation);
1429                                 next_e = le32_to_cpu(
1430                                         vdp->nextVolDescSeqExt.extLength);
1431                                 next_e = next_e >> sb->s_blocksize_bits;
1432                                 next_e += next_s;
1433                         }
1434                         break;
1435                 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1436                         curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1437                         if (vdsn >= curr->volDescSeqNum) {
1438                                 curr->volDescSeqNum = vdsn;
1439                                 curr->block = block;
1440                         }
1441                         break;
1442                 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1443                         curr = &vds[VDS_POS_PARTITION_DESC];
1444                         if (!curr->block)
1445                                 curr->block = block;
1446                         break;
1447                 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1448                         curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1449                         if (vdsn >= curr->volDescSeqNum) {
1450                                 curr->volDescSeqNum = vdsn;
1451                                 curr->block = block;
1452                         }
1453                         break;
1454                 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1455                         curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1456                         if (vdsn >= curr->volDescSeqNum) {
1457                                 curr->volDescSeqNum = vdsn;
1458                                 curr->block = block;
1459                         }
1460                         break;
1461                 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1462                         vds[VDS_POS_TERMINATING_DESC].block = block;
1463                         if (next_e) {
1464                                 block = next_s;
1465                                 lastblock = next_e;
1466                                 next_s = next_e = 0;
1467                         } else
1468                                 done = 1;
1469                         break;
1470                 }
1471                 brelse(bh);
1472         }
1473         /*
1474          * Now read interesting descriptors again and process them
1475          * in a suitable order
1476          */
1477         if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1478                 printk(KERN_ERR "udf: Primary Volume Descriptor not found!\n");
1479                 return 1;
1480         }
1481         if (udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block))
1482                 return 1;
1483
1484         if (vds[VDS_POS_LOGICAL_VOL_DESC].block && udf_load_logicalvol(sb,
1485             vds[VDS_POS_LOGICAL_VOL_DESC].block, fileset))
1486                 return 1;
1487
1488         if (vds[VDS_POS_PARTITION_DESC].block) {
1489                 /*
1490                  * We rescan the whole descriptor sequence to find
1491                  * partition descriptor blocks and process them.
1492                  */
1493                 for (block = vds[VDS_POS_PARTITION_DESC].block;
1494                      block < vds[VDS_POS_TERMINATING_DESC].block;
1495                      block++)
1496                         if (udf_load_partdesc(sb, block))
1497                                 return 1;
1498         }
1499
1500         return 0;
1501 }
1502
1503 /*
1504  * udf_check_valid()
1505  */
1506 static int udf_check_valid(struct super_block *sb, int novrs, int silent)
1507 {
1508         long block;
1509         struct udf_sb_info *sbi = UDF_SB(sb);
1510
1511         if (novrs) {
1512                 udf_debug("Validity check skipped because of novrs option\n");
1513                 return 0;
1514         }
1515         /* Check that it is NSR02 compliant */
1516         /* Process any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
1517         block = udf_vrs(sb, silent);
1518         if (block == -1)
1519                 udf_debug("Failed to read byte 32768. Assuming open "
1520                           "disc. Skipping validity check\n");
1521         if (block && !sbi->s_last_block)
1522                 sbi->s_last_block = udf_get_last_block(sb);
1523         return !block;
1524 }
1525
1526 static int udf_load_sequence(struct super_block *sb, kernel_lb_addr *fileset)
1527 {
1528         struct anchorVolDescPtr *anchor;
1529         uint16_t ident;
1530         struct buffer_head *bh;
1531         long main_s, main_e, reserve_s, reserve_e;
1532         int i;
1533         struct udf_sb_info *sbi;
1534
1535         if (!sb)
1536                 return 1;
1537         sbi = UDF_SB(sb);
1538
1539         for (i = 0; i < ARRAY_SIZE(sbi->s_anchor); i++) {
1540                 if (!sbi->s_anchor[i])
1541                         continue;
1542
1543                 bh = udf_read_tagged(sb, sbi->s_anchor[i], sbi->s_anchor[i],
1544                                      &ident);
1545                 if (!bh)
1546                         continue;
1547
1548                 anchor = (struct anchorVolDescPtr *)bh->b_data;
1549
1550                 /* Locate the main sequence */
1551                 main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1552                 main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1553                 main_e = main_e >> sb->s_blocksize_bits;
1554                 main_e += main_s;
1555
1556                 /* Locate the reserve sequence */
1557                 reserve_s = le32_to_cpu(
1558                                 anchor->reserveVolDescSeqExt.extLocation);
1559                 reserve_e = le32_to_cpu(
1560                                 anchor->reserveVolDescSeqExt.extLength);
1561                 reserve_e = reserve_e >> sb->s_blocksize_bits;
1562                 reserve_e += reserve_s;
1563
1564                 brelse(bh);
1565
1566                 /* Process the main & reserve sequences */
1567                 /* responsible for finding the PartitionDesc(s) */
1568                 if (!(udf_process_sequence(sb, main_s, main_e,
1569                                            fileset) &&
1570                       udf_process_sequence(sb, reserve_s, reserve_e,
1571                                            fileset)))
1572                         break;
1573         }
1574
1575         if (i == ARRAY_SIZE(sbi->s_anchor)) {
1576                 udf_debug("No Anchor block found\n");
1577                 return 1;
1578         }
1579         udf_debug("Using anchor in block %d\n", sbi->s_anchor[i]);
1580
1581         return 0;
1582 }
1583
1584 static void udf_open_lvid(struct super_block *sb)
1585 {
1586         struct udf_sb_info *sbi = UDF_SB(sb);
1587         struct buffer_head *bh = sbi->s_lvid_bh;
1588         struct logicalVolIntegrityDesc *lvid;
1589         struct logicalVolIntegrityDescImpUse *lvidiu;
1590         if (!bh)
1591                 return;
1592
1593         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1594         lvidiu = udf_sb_lvidiu(sbi);
1595
1596         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1597         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1598         udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
1599                                 CURRENT_TIME);
1600         lvid->integrityType = LVID_INTEGRITY_TYPE_OPEN;
1601
1602         lvid->descTag.descCRC = cpu_to_le16(
1603                 udf_crc((char *)lvid + sizeof(tag),
1604                         le16_to_cpu(lvid->descTag.descCRCLength), 0));
1605
1606         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1607         mark_buffer_dirty(bh);
1608 }
1609
1610 static void udf_close_lvid(struct super_block *sb)
1611 {
1612         struct udf_sb_info *sbi = UDF_SB(sb);
1613         struct buffer_head *bh = sbi->s_lvid_bh;
1614         struct logicalVolIntegrityDesc *lvid;
1615         struct logicalVolIntegrityDescImpUse *lvidiu;
1616
1617         if (!bh)
1618                 return;
1619
1620         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1621
1622         if (lvid->integrityType != LVID_INTEGRITY_TYPE_OPEN)
1623                 return;
1624
1625         lvidiu = udf_sb_lvidiu(sbi);
1626         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1627         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1628         udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
1629         if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1630                 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1631         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1632                 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1633         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
1634                 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
1635         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1636
1637         lvid->descTag.descCRC = cpu_to_le16(
1638                 udf_crc((char *)lvid + sizeof(tag),
1639                         le16_to_cpu(lvid->descTag.descCRCLength),
1640                         0));
1641
1642         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1643         mark_buffer_dirty(bh);
1644 }
1645
1646 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
1647 {
1648         int i;
1649         int nr_groups = bitmap->s_nr_groups;
1650         int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
1651                                                 nr_groups);
1652
1653         for (i = 0; i < nr_groups; i++)
1654                 if (bitmap->s_block_bitmap[i])
1655                         brelse(bitmap->s_block_bitmap[i]);
1656
1657         if (size <= PAGE_SIZE)
1658                 kfree(bitmap);
1659         else
1660                 vfree(bitmap);
1661 }
1662
1663 static void udf_free_partition(struct udf_part_map *map)
1664 {
1665         int i;
1666
1667         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1668                 iput(map->s_uspace.s_table);
1669         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1670                 iput(map->s_fspace.s_table);
1671         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1672                 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
1673         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1674                 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
1675         if (map->s_partition_type == UDF_SPARABLE_MAP15)
1676                 for (i = 0; i < 4; i++)
1677                         brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
1678 }
1679
1680 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1681 {
1682         int i;
1683         struct inode *inode = NULL;
1684         struct udf_options uopt;
1685         kernel_lb_addr rootdir, fileset;
1686         struct udf_sb_info *sbi;
1687
1688         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1689         uopt.uid = -1;
1690         uopt.gid = -1;
1691         uopt.umask = 0;
1692
1693         sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1694         if (!sbi)
1695                 return -ENOMEM;
1696
1697         sb->s_fs_info = sbi;
1698
1699         mutex_init(&sbi->s_alloc_mutex);
1700
1701         if (!udf_parse_options((char *)options, &uopt, false))
1702                 goto error_out;
1703
1704         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1705             uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
1706                 udf_error(sb, "udf_read_super",
1707                           "utf8 cannot be combined with iocharset\n");
1708                 goto error_out;
1709         }
1710 #ifdef CONFIG_UDF_NLS
1711         if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1712                 uopt.nls_map = load_nls_default();
1713                 if (!uopt.nls_map)
1714                         uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1715                 else
1716                         udf_debug("Using default NLS map\n");
1717         }
1718 #endif
1719         if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1720                 uopt.flags |= (1 << UDF_FLAG_UTF8);
1721
1722         fileset.logicalBlockNum = 0xFFFFFFFF;
1723         fileset.partitionReferenceNum = 0xFFFF;
1724
1725         sbi->s_flags = uopt.flags;
1726         sbi->s_uid = uopt.uid;
1727         sbi->s_gid = uopt.gid;
1728         sbi->s_umask = uopt.umask;
1729         sbi->s_nls_map = uopt.nls_map;
1730
1731         /* Set the block size for all transfers */
1732         if (!sb_min_blocksize(sb, uopt.blocksize)) {
1733                 udf_debug("Bad block size (%d)\n", uopt.blocksize);
1734                 printk(KERN_ERR "udf: bad block size (%d)\n", uopt.blocksize);
1735                 goto error_out;
1736         }
1737
1738         if (uopt.session == 0xFFFFFFFF)
1739                 sbi->s_session = udf_get_last_session(sb);
1740         else
1741                 sbi->s_session = uopt.session;
1742
1743         udf_debug("Multi-session=%d\n", sbi->s_session);
1744
1745         sbi->s_last_block = uopt.lastblock;
1746         sbi->s_anchor[0] = sbi->s_anchor[1] = 0;
1747         sbi->s_anchor[2] = uopt.anchor;
1748
1749         if (udf_check_valid(sb, uopt.novrs, silent)) {
1750                 /* read volume recognition sequences */
1751                 printk(KERN_WARNING "UDF-fs: No VRS found\n");
1752                 goto error_out;
1753         }
1754
1755         udf_find_anchor(sb);
1756
1757         /* Fill in the rest of the superblock */
1758         sb->s_op = &udf_sb_ops;
1759         sb->dq_op = NULL;
1760         sb->s_dirt = 0;
1761         sb->s_magic = UDF_SUPER_MAGIC;
1762         sb->s_time_gran = 1000;
1763
1764         if (udf_load_sequence(sb, &fileset)) {
1765                 printk(KERN_WARNING "UDF-fs: No partition found (1)\n");
1766                 goto error_out;
1767         }
1768
1769         udf_debug("Lastblock=%d\n", sbi->s_last_block);
1770
1771         if (sbi->s_lvid_bh) {
1772                 struct logicalVolIntegrityDescImpUse *lvidiu =
1773                                                         udf_sb_lvidiu(sbi);
1774                 uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
1775                 uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
1776                 /* uint16_t maxUDFWriteRev =
1777                                 le16_to_cpu(lvidiu->maxUDFWriteRev); */
1778
1779                 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
1780                         printk(KERN_ERR "UDF-fs: minUDFReadRev=%x "
1781                                         "(max is %x)\n",
1782                                le16_to_cpu(lvidiu->minUDFReadRev),
1783                                UDF_MAX_READ_VERSION);
1784                         goto error_out;
1785                 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
1786                         sb->s_flags |= MS_RDONLY;
1787
1788                 sbi->s_udfrev = minUDFWriteRev;
1789
1790                 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1791                         UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
1792                 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
1793                         UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
1794         }
1795
1796         if (!sbi->s_partitions) {
1797                 printk(KERN_WARNING "UDF-fs: No partition found (2)\n");
1798                 goto error_out;
1799         }
1800
1801         if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
1802                         UDF_PART_FLAG_READ_ONLY) {
1803                 printk(KERN_NOTICE "UDF-fs: Partition marked readonly; "
1804                                    "forcing readonly mount\n");
1805                 sb->s_flags |= MS_RDONLY;
1806         }
1807
1808         if (udf_find_fileset(sb, &fileset, &rootdir)) {
1809                 printk(KERN_WARNING "UDF-fs: No fileset found\n");
1810                 goto error_out;
1811         }
1812
1813         if (!silent) {
1814                 timestamp ts;
1815                 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
1816                 udf_info("UDF: Mounting volume '%s', "
1817                          "timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
1818                          sbi->s_volume_ident, le16_to_cpu(ts.year), ts.month, ts.day,
1819                          ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
1820         }
1821         if (!(sb->s_flags & MS_RDONLY))
1822                 udf_open_lvid(sb);
1823
1824         /* Assign the root inode */
1825         /* assign inodes by physical block number */
1826         /* perhaps it's not extensible enough, but for now ... */
1827         inode = udf_iget(sb, rootdir);
1828         if (!inode) {
1829                 printk(KERN_ERR "UDF-fs: Error in udf_iget, block=%d, "
1830                                 "partition=%d\n",
1831                        rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
1832                 goto error_out;
1833         }
1834
1835         /* Allocate a dentry for the root inode */
1836         sb->s_root = d_alloc_root(inode);
1837         if (!sb->s_root) {
1838                 printk(KERN_ERR "UDF-fs: Couldn't allocate root dentry\n");
1839                 iput(inode);
1840                 goto error_out;
1841         }
1842         sb->s_maxbytes = MAX_LFS_FILESIZE;
1843         return 0;
1844
1845 error_out:
1846         if (sbi->s_vat_inode)
1847                 iput(sbi->s_vat_inode);
1848         if (sbi->s_partitions)
1849                 for (i = 0; i < sbi->s_partitions; i++)
1850                         udf_free_partition(&sbi->s_partmaps[i]);
1851 #ifdef CONFIG_UDF_NLS
1852         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1853                 unload_nls(sbi->s_nls_map);
1854 #endif
1855         if (!(sb->s_flags & MS_RDONLY))
1856                 udf_close_lvid(sb);
1857         brelse(sbi->s_lvid_bh);
1858
1859         kfree(sbi->s_partmaps);
1860         kfree(sbi);
1861         sb->s_fs_info = NULL;
1862
1863         return -EINVAL;
1864 }
1865
1866 static void udf_error(struct super_block *sb, const char *function,
1867                       const char *fmt, ...)
1868 {
1869         va_list args;
1870
1871         if (!(sb->s_flags & MS_RDONLY)) {
1872                 /* mark sb error */
1873                 sb->s_dirt = 1;
1874         }
1875         va_start(args, fmt);
1876         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1877         va_end(args);
1878         printk(KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
1879                 sb->s_id, function, error_buf);
1880 }
1881
1882 void udf_warning(struct super_block *sb, const char *function,
1883                  const char *fmt, ...)
1884 {
1885         va_list args;
1886
1887         va_start(args, fmt);
1888         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1889         va_end(args);
1890         printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
1891                sb->s_id, function, error_buf);
1892 }
1893
1894 static void udf_put_super(struct super_block *sb)
1895 {
1896         int i;
1897         struct udf_sb_info *sbi;
1898
1899         sbi = UDF_SB(sb);
1900         if (sbi->s_vat_inode)
1901                 iput(sbi->s_vat_inode);
1902         if (sbi->s_partitions)
1903                 for (i = 0; i < sbi->s_partitions; i++)
1904                         udf_free_partition(&sbi->s_partmaps[i]);
1905 #ifdef CONFIG_UDF_NLS
1906         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1907                 unload_nls(sbi->s_nls_map);
1908 #endif
1909         if (!(sb->s_flags & MS_RDONLY))
1910                 udf_close_lvid(sb);
1911         brelse(sbi->s_lvid_bh);
1912         kfree(sbi->s_partmaps);
1913         kfree(sb->s_fs_info);
1914         sb->s_fs_info = NULL;
1915 }
1916
1917 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
1918 {
1919         struct super_block *sb = dentry->d_sb;
1920         struct udf_sb_info *sbi = UDF_SB(sb);
1921         struct logicalVolIntegrityDescImpUse *lvidiu;
1922
1923         if (sbi->s_lvid_bh != NULL)
1924                 lvidiu = udf_sb_lvidiu(sbi);
1925         else
1926                 lvidiu = NULL;
1927
1928         buf->f_type = UDF_SUPER_MAGIC;
1929         buf->f_bsize = sb->s_blocksize;
1930         buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
1931         buf->f_bfree = udf_count_free(sb);
1932         buf->f_bavail = buf->f_bfree;
1933         buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
1934                                           le32_to_cpu(lvidiu->numDirs)) : 0)
1935                         + buf->f_bfree;
1936         buf->f_ffree = buf->f_bfree;
1937         /* __kernel_fsid_t f_fsid */
1938         buf->f_namelen = UDF_NAME_LEN - 2;
1939
1940         return 0;
1941 }
1942
1943 static unsigned int udf_count_free_bitmap(struct super_block *sb,
1944                                           struct udf_bitmap *bitmap)
1945 {
1946         struct buffer_head *bh = NULL;
1947         unsigned int accum = 0;
1948         int index;
1949         int block = 0, newblock;
1950         kernel_lb_addr loc;
1951         uint32_t bytes;
1952         uint8_t *ptr;
1953         uint16_t ident;
1954         struct spaceBitmapDesc *bm;
1955
1956         lock_kernel();
1957
1958         loc.logicalBlockNum = bitmap->s_extPosition;
1959         loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
1960         bh = udf_read_ptagged(sb, loc, 0, &ident);
1961
1962         if (!bh) {
1963                 printk(KERN_ERR "udf: udf_count_free failed\n");
1964                 goto out;
1965         } else if (ident != TAG_IDENT_SBD) {
1966                 brelse(bh);
1967                 printk(KERN_ERR "udf: udf_count_free failed\n");
1968                 goto out;
1969         }
1970
1971         bm = (struct spaceBitmapDesc *)bh->b_data;
1972         bytes = le32_to_cpu(bm->numOfBytes);
1973         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
1974         ptr = (uint8_t *)bh->b_data;
1975
1976         while (bytes > 0) {
1977                 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
1978                 accum += bitmap_weight((const unsigned long *)(ptr + index),
1979                                         cur_bytes * 8);
1980                 bytes -= cur_bytes;
1981                 if (bytes) {
1982                         brelse(bh);
1983                         newblock = udf_get_lb_pblock(sb, loc, ++block);
1984                         bh = udf_tread(sb, newblock);
1985                         if (!bh) {
1986                                 udf_debug("read failed\n");
1987                                 goto out;
1988                         }
1989                         index = 0;
1990                         ptr = (uint8_t *)bh->b_data;
1991                 }
1992         }
1993         brelse(bh);
1994
1995 out:
1996         unlock_kernel();
1997
1998         return accum;
1999 }
2000
2001 static unsigned int udf_count_free_table(struct super_block *sb,
2002                                          struct inode *table)
2003 {
2004         unsigned int accum = 0;
2005         uint32_t elen;
2006         kernel_lb_addr eloc;
2007         int8_t etype;
2008         struct extent_position epos;
2009
2010         lock_kernel();
2011
2012         epos.block = UDF_I(table)->i_location;
2013         epos.offset = sizeof(struct unallocSpaceEntry);
2014         epos.bh = NULL;
2015
2016         while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2017                 accum += (elen >> table->i_sb->s_blocksize_bits);
2018
2019         brelse(epos.bh);
2020
2021         unlock_kernel();
2022
2023         return accum;
2024 }
2025
2026 static unsigned int udf_count_free(struct super_block *sb)
2027 {
2028         unsigned int accum = 0;
2029         struct udf_sb_info *sbi;
2030         struct udf_part_map *map;
2031
2032         sbi = UDF_SB(sb);
2033         if (sbi->s_lvid_bh) {
2034                 struct logicalVolIntegrityDesc *lvid =
2035                         (struct logicalVolIntegrityDesc *)
2036                         sbi->s_lvid_bh->b_data;
2037                 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
2038                         accum = le32_to_cpu(
2039                                         lvid->freeSpaceTable[sbi->s_partition]);
2040                         if (accum == 0xFFFFFFFF)
2041                                 accum = 0;
2042                 }
2043         }
2044
2045         if (accum)
2046                 return accum;
2047
2048         map = &sbi->s_partmaps[sbi->s_partition];
2049         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2050                 accum += udf_count_free_bitmap(sb,
2051                                                map->s_uspace.s_bitmap);
2052         }
2053         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
2054                 accum += udf_count_free_bitmap(sb,
2055                                                map->s_fspace.s_bitmap);
2056         }
2057         if (accum)
2058                 return accum;
2059
2060         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2061                 accum += udf_count_free_table(sb,
2062                                               map->s_uspace.s_table);
2063         }
2064         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
2065                 accum += udf_count_free_table(sb,
2066                                               map->s_fspace.s_table);
2067         }
2068
2069         return accum;
2070 }