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 <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 int udf_load_partition(struct super_block *, kernel_lb_addr *);
  88 static int udf_load_logicalvol(struct super_block *, struct buffer_head *,
  89                                kernel_lb_addr *);
  90 static void udf_load_logicalvolint(struct super_block *, kernel_extent_ad);
  91 static void udf_find_anchor(struct super_block *);
  92 static int udf_find_fileset(struct super_block *, kernel_lb_addr *,
  93                             kernel_lb_addr *);
  94 static void udf_load_pvoldesc(struct super_block *, struct buffer_head *);
  95 static void udf_load_fileset(struct super_block *, struct buffer_head *,
  96                              kernel_lb_addr *);
  97 static int udf_load_partdesc(struct super_block *, struct buffer_head *);
  98 static void udf_open_lvid(struct super_block *);
  99 static void udf_close_lvid(struct super_block *);
 100 static unsigned int udf_count_free(struct super_block *);
 101 static int udf_statfs(struct dentry *, struct kstatfs *);
 102 static int udf_show_options(struct seq_file *, struct vfsmount *);
 103 static void udf_error(struct super_block *sb, const char *function,
 104                       const char *fmt, ...);
 105
 106 struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct udf_sb_info *sbi)
 107 {
 108         struct logicalVolIntegrityDesc *lvid =
 109                 (struct logicalVolIntegrityDesc *)sbi->s_lvid_bh->b_data;
 110         __u32 number_of_partitions = le32_to_cpu(lvid->numOfPartitions);
 111         __u32 offset = number_of_partitions * 2 *
 112                                 sizeof(uint32_t)/sizeof(uint8_t);
 113         return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
 114 }
 115
 116 /* UDF filesystem type */
 117 static int udf_get_sb(struct file_system_type *fs_type,
 118                       int flags, const char *dev_name, void *data,
 119                       struct vfsmount *mnt)
 120 {
 121         return get_sb_bdev(fs_type, flags, dev_name, data, udf_fill_super, mnt);
 122 }
 123
 124 static struct file_system_type udf_fstype = {
 125         .owner          = THIS_MODULE,
 126         .name           = "udf",
 127         .get_sb         = udf_get_sb,
 128         .kill_sb        = kill_block_super,
 129         .fs_flags       = FS_REQUIRES_DEV,
 130 };
 131
 132 static struct kmem_cache *udf_inode_cachep;
 133
 134 static struct inode *udf_alloc_inode(struct super_block *sb)
 135 {
 136         struct udf_inode_info *ei;
 137         ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
 138         if (!ei)
 139                 return NULL;
 140
 141         ei->i_unique = 0;
 142         ei->i_lenExtents = 0;
 143         ei->i_next_alloc_block = 0;
 144         ei->i_next_alloc_goal = 0;
 145         ei->i_strat4096 = 0;
 146
 147         return &ei->vfs_inode;
 148 }
 149
 150 static void udf_destroy_inode(struct inode *inode)
 151 {
 152         kmem_cache_free(udf_inode_cachep, UDF_I(inode));
 153 }
 154
 155 static void init_once(struct kmem_cache *cachep, void *foo)
 156 {
 157         struct udf_inode_info *ei = (struct udf_inode_info *)foo;
 158
 159         ei->i_ext.i_data = NULL;
 160         inode_init_once(&ei->vfs_inode);
 161 }
 162
 163 static int init_inodecache(void)
 164 {
 165         udf_inode_cachep = kmem_cache_create("udf_inode_cache",
 166                                              sizeof(struct udf_inode_info),
 167                                              0, (SLAB_RECLAIM_ACCOUNT |
 168                                                  SLAB_MEM_SPREAD),
 169                                              init_once);
 170         if (!udf_inode_cachep)
 171                 return -ENOMEM;
 172         return 0;
 173 }
 174
 175 static void destroy_inodecache(void)
 176 {
 177         kmem_cache_destroy(udf_inode_cachep);
 178 }
 179
 180 /* Superblock operations */
 181 static const struct super_operations udf_sb_ops = {
 182         .alloc_inode    = udf_alloc_inode,
 183         .destroy_inode  = udf_destroy_inode,
 184         .write_inode    = udf_write_inode,
 185         .delete_inode   = udf_delete_inode,
 186         .clear_inode    = udf_clear_inode,
 187         .put_super      = udf_put_super,
 188         .write_super    = udf_write_super,
 189         .statfs         = udf_statfs,
 190         .remount_fs     = udf_remount_fs,
 191         .show_options   = udf_show_options,
 192 };
 193
 194 struct udf_options {
 195         unsigned char novrs;
 196         unsigned int blocksize;
 197         unsigned int session;
 198         unsigned int lastblock;
 199         unsigned int anchor;
 200         unsigned int volume;
 201         unsigned short partition;
 202         unsigned int fileset;
 203         unsigned int rootdir;
 204         unsigned int flags;
 205         mode_t umask;
 206         gid_t gid;
 207         uid_t uid;
 208         struct nls_table *nls_map;
 209 };
 210
 211 static int __init init_udf_fs(void)
 212 {
 213         int err;
 214
 215         err = init_inodecache();
 216         if (err)
 217                 goto out1;
 218         err = register_filesystem(&udf_fstype);
 219         if (err)
 220                 goto out;
 221
 222         return 0;
 223
 224 out:
 225         destroy_inodecache();
 226
 227 out1:
 228         return err;
 229 }
 230
 231 static void __exit exit_udf_fs(void)
 232 {
 233         unregister_filesystem(&udf_fstype);
 234         destroy_inodecache();
 235 }
 236
 237 module_init(init_udf_fs)
 238 module_exit(exit_udf_fs)
 239
 240 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
 241 {
 242         struct udf_sb_info *sbi = UDF_SB(sb);
 243
 244         sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map),
 245                                   GFP_KERNEL);
 246         if (!sbi->s_partmaps) {
 247                 udf_error(sb, __FUNCTION__,
 248                           "Unable to allocate space for %d partition maps",
 249                           count);
 250                 sbi->s_partitions = 0;
 251                 return -ENOMEM;
 252         }
 253
 254         sbi->s_partitions = count;
 255         return 0;
 256 }
 257
 258 static int udf_show_options(struct seq_file *seq, struct vfsmount *mnt)
 259 {
 260         struct super_block *sb = mnt->mnt_sb;
 261         struct udf_sb_info *sbi = UDF_SB(sb);
 262
 263         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
 264                 seq_puts(seq, ",nostrict");
 265         if (sb->s_blocksize != UDF_DEFAULT_BLOCKSIZE)
 266                 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
 267         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
 268                 seq_puts(seq, ",unhide");
 269         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
 270                 seq_puts(seq, ",undelete");
 271         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
 272                 seq_puts(seq, ",noadinicb");
 273         if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
 274                 seq_puts(seq, ",shortad");
 275         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
 276                 seq_puts(seq, ",uid=forget");
 277         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_IGNORE))
 278                 seq_puts(seq, ",uid=ignore");
 279         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
 280                 seq_puts(seq, ",gid=forget");
 281         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE))
 282                 seq_puts(seq, ",gid=ignore");
 283         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
 284                 seq_printf(seq, ",uid=%u", sbi->s_uid);
 285         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
 286                 seq_printf(seq, ",gid=%u", sbi->s_gid);
 287         if (sbi->s_umask != 0)
 288                 seq_printf(seq, ",umask=%o", sbi->s_umask);
 289         if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
 290                 seq_printf(seq, ",session=%u", sbi->s_session);
 291         if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
 292                 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
 293         /*
 294          * s_anchor[2] could be zeroed out in case there is no anchor
 295          * in the specified block, but then the "anchor=N" option
 296          * originally given by the user wasn't effective, so it's OK
 297          * if we don't show it.
 298          */
 299         if (sbi->s_anchor[2] != 0)
 300                 seq_printf(seq, ",anchor=%u", sbi->s_anchor[2]);
 301         /*
 302          * volume, partition, fileset and rootdir seem to be ignored
 303          * currently
 304          */
 305         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
 306                 seq_puts(seq, ",utf8");
 307         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
 308                 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
 309
 310         return 0;
 311 }
 312
 313 /*
 314  * udf_parse_options
 315  *
 316  * PURPOSE
 317  *      Parse mount options.
 318  *
 319  * DESCRIPTION
 320  *      The following mount options are supported:
 321  *
 322  *      gid=            Set the default group.
 323  *      umask=          Set the default umask.
 324  *      uid=            Set the default user.
 325  *      bs=             Set the block size.
 326  *      unhide          Show otherwise hidden files.
 327  *      undelete        Show deleted files in lists.
 328  *      adinicb         Embed data in the inode (default)
 329  *      noadinicb       Don't embed data in the inode
 330  *      shortad         Use short ad's
 331  *      longad          Use long ad's (default)
 332  *      nostrict        Unset strict conformance
 333  *      iocharset=      Set the NLS character set
 334  *
 335  *      The remaining are for debugging and disaster recovery:
 336  *
 337  *      novrs           Skip volume sequence recognition
 338  *
 339  *      The following expect a offset from 0.
 340  *
 341  *      session=        Set the CDROM session (default= last session)
 342  *      anchor=         Override standard anchor location. (default= 256)
 343  *      volume=         Override the VolumeDesc location. (unused)
 344  *      partition=      Override the PartitionDesc location. (unused)
 345  *      lastblock=      Set the last block of the filesystem/
 346  *
 347  *      The following expect a offset from the partition root.
 348  *
 349  *      fileset=        Override the fileset block location. (unused)
 350  *      rootdir=        Override the root directory location. (unused)
 351  *              WARNING: overriding the rootdir to a non-directory may
 352  *              yield highly unpredictable results.
 353  *
 354  * PRE-CONDITIONS
 355  *      options         Pointer to mount options string.
 356  *      uopts           Pointer to mount options variable.
 357  *
 358  * POST-CONDITIONS
 359  *      <return>        1       Mount options parsed okay.
 360  *      <return>        0       Error parsing mount options.
 361  *
 362  * HISTORY
 363  *      July 1, 1997 - Andrew E. Mileski
 364  *      Written, tested, and released.
 365  */
 366
 367 enum {
 368         Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
 369         Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
 370         Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
 371         Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
 372         Opt_rootdir, Opt_utf8, Opt_iocharset,
 373         Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore
 374 };
 375
 376 static match_table_t tokens = {
 377         {Opt_novrs,     "novrs"},
 378         {Opt_nostrict,  "nostrict"},
 379         {Opt_bs,        "bs=%u"},
 380         {Opt_unhide,    "unhide"},
 381         {Opt_undelete,  "undelete"},
 382         {Opt_noadinicb, "noadinicb"},
 383         {Opt_adinicb,   "adinicb"},
 384         {Opt_shortad,   "shortad"},
 385         {Opt_longad,    "longad"},
 386         {Opt_uforget,   "uid=forget"},
 387         {Opt_uignore,   "uid=ignore"},
 388         {Opt_gforget,   "gid=forget"},
 389         {Opt_gignore,   "gid=ignore"},
 390         {Opt_gid,       "gid=%u"},
 391         {Opt_uid,       "uid=%u"},
 392         {Opt_umask,     "umask=%o"},
 393         {Opt_session,   "session=%u"},
 394         {Opt_lastblock, "lastblock=%u"},
 395         {Opt_anchor,    "anchor=%u"},
 396         {Opt_volume,    "volume=%u"},
 397         {Opt_partition, "partition=%u"},
 398         {Opt_fileset,   "fileset=%u"},
 399         {Opt_rootdir,   "rootdir=%u"},
 400         {Opt_utf8,      "utf8"},
 401         {Opt_iocharset, "iocharset=%s"},
 402         {Opt_err,       NULL}
 403 };
 404
 405 static int udf_parse_options(char *options, struct udf_options *uopt,
 406                              bool remount)
 407 {
 408         char *p;
 409         int option;
 410
 411         uopt->novrs = 0;
 412         uopt->blocksize = UDF_DEFAULT_BLOCKSIZE;
 413         uopt->partition = 0xFFFF;
 414         uopt->session = 0xFFFFFFFF;
 415         uopt->lastblock = 0;
 416         uopt->anchor = 0;
 417         uopt->volume = 0xFFFFFFFF;
 418         uopt->rootdir = 0xFFFFFFFF;
 419         uopt->fileset = 0xFFFFFFFF;
 420         uopt->nls_map = NULL;
 421
 422         if (!options)
 423                 return 1;
 424
 425         while ((p = strsep(&options, ",")) != NULL) {
 426                 substring_t args[MAX_OPT_ARGS];
 427                 int token;
 428                 if (!*p)
 429                         continue;
 430
 431                 token = match_token(p, tokens, args);
 432                 switch (token) {
 433                 case Opt_novrs:
 434                         uopt->novrs = 1;
 435                 case Opt_bs:
 436                         if (match_int(&args[0], &option))
 437                                 return 0;
 438                         uopt->blocksize = option;
 439                         break;
 440                 case Opt_unhide:
 441                         uopt->flags |= (1 << UDF_FLAG_UNHIDE);
 442                         break;
 443                 case Opt_undelete:
 444                         uopt->flags |= (1 << UDF_FLAG_UNDELETE);
 445                         break;
 446                 case Opt_noadinicb:
 447                         uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
 448                         break;
 449                 case Opt_adinicb:
 450                         uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
 451                         break;
 452                 case Opt_shortad:
 453                         uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
 454                         break;
 455                 case Opt_longad:
 456                         uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
 457                         break;
 458                 case Opt_gid:
 459                         if (match_int(args, &option))
 460                                 return 0;
 461                         uopt->gid = option;
 462                         uopt->flags |= (1 << UDF_FLAG_GID_SET);
 463                         break;
 464                 case Opt_uid:
 465                         if (match_int(args, &option))
 466                                 return 0;
 467                         uopt->uid = option;
 468                         uopt->flags |= (1 << UDF_FLAG_UID_SET);
 469                         break;
 470                 case Opt_umask:
 471                         if (match_octal(args, &option))
 472                                 return 0;
 473                         uopt->umask = option;
 474                         break;
 475                 case Opt_nostrict:
 476                         uopt->flags &= ~(1 << UDF_FLAG_STRICT);
 477                         break;
 478                 case Opt_session:
 479                         if (match_int(args, &option))
 480                                 return 0;
 481                         uopt->session = option;
 482                         if (!remount)
 483                                 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
 484                         break;
 485                 case Opt_lastblock:
 486                         if (match_int(args, &option))
 487                                 return 0;
 488                         uopt->lastblock = option;
 489                         if (!remount)
 490                                 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
 491                         break;
 492                 case Opt_anchor:
 493                         if (match_int(args, &option))
 494                                 return 0;
 495                         uopt->anchor = option;
 496                         break;
 497                 case Opt_volume:
 498                         if (match_int(args, &option))
 499                                 return 0;
 500                         uopt->volume = option;
 501                         break;
 502                 case Opt_partition:
 503                         if (match_int(args, &option))
 504                                 return 0;
 505                         uopt->partition = option;
 506                         break;
 507                 case Opt_fileset:
 508                         if (match_int(args, &option))
 509                                 return 0;
 510                         uopt->fileset = option;
 511                         break;
 512                 case Opt_rootdir:
 513                         if (match_int(args, &option))
 514                                 return 0;
 515                         uopt->rootdir = option;
 516                         break;
 517                 case Opt_utf8:
 518                         uopt->flags |= (1 << UDF_FLAG_UTF8);
 519                         break;
 520 #ifdef CONFIG_UDF_NLS
 521                 case Opt_iocharset:
 522                         uopt->nls_map = load_nls(args[0].from);
 523                         uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
 524                         break;
 525 #endif
 526                 case Opt_uignore:
 527                         uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
 528                         break;
 529                 case Opt_uforget:
 530                         uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
 531                         break;
 532                 case Opt_gignore:
 533                         uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
 534                         break;
 535                 case Opt_gforget:
 536                         uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
 537                         break;
 538                 default:
 539                         printk(KERN_ERR "udf: bad mount option \"%s\" "
 540                                "or missing value\n", p);
 541                         return 0;
 542                 }
 543         }
 544         return 1;
 545 }
 546
 547 static void udf_write_super(struct super_block *sb)
 548 {
 549         lock_kernel();
 550
 551         if (!(sb->s_flags & MS_RDONLY))
 552                 udf_open_lvid(sb);
 553         sb->s_dirt = 0;
 554
 555         unlock_kernel();
 556 }
 557
 558 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
 559 {
 560         struct udf_options uopt;
 561         struct udf_sb_info *sbi = UDF_SB(sb);
 562
 563         uopt.flags = sbi->s_flags;
 564         uopt.uid   = sbi->s_uid;
 565         uopt.gid   = sbi->s_gid;
 566         uopt.umask = sbi->s_umask;
 567
 568         if (!udf_parse_options(options, &uopt, true))
 569                 return -EINVAL;
 570
 571         sbi->s_flags = uopt.flags;
 572         sbi->s_uid   = uopt.uid;
 573         sbi->s_gid   = uopt.gid;
 574         sbi->s_umask = uopt.umask;
 575
 576         if (sbi->s_lvid_bh) {
 577                 int write_rev = le16_to_cpu(udf_sb_lvidiu(sbi)->minUDFWriteRev);
 578                 if (write_rev > UDF_MAX_WRITE_VERSION)
 579                         *flags |= MS_RDONLY;
 580         }
 581
 582         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 583                 return 0;
 584         if (*flags & MS_RDONLY)
 585                 udf_close_lvid(sb);
 586         else
 587                 udf_open_lvid(sb);
 588
 589         return 0;
 590 }
 591
 592 static int udf_vrs(struct super_block *sb, int silent)
 593 {
 594         struct volStructDesc *vsd = NULL;
 595         int sector = 32768;
 596         int sectorsize;
 597         struct buffer_head *bh = NULL;
 598         int iso9660 = 0;
 599         int nsr02 = 0;
 600         int nsr03 = 0;
 601         struct udf_sb_info *sbi;
 602
 603         /* Block size must be a multiple of 512 */
 604         if (sb->s_blocksize & 511)
 605                 return 0;
 606         sbi = UDF_SB(sb);
 607
 608         if (sb->s_blocksize < sizeof(struct volStructDesc))
 609                 sectorsize = sizeof(struct volStructDesc);
 610         else
 611                 sectorsize = sb->s_blocksize;
 612
 613         sector += (sbi->s_session << sb->s_blocksize_bits);
 614
 615         udf_debug("Starting at sector %u (%ld byte sectors)\n",
 616                   (sector >> sb->s_blocksize_bits), sb->s_blocksize);
 617         /* Process the sequence (if applicable) */
 618         for (; !nsr02 && !nsr03; sector += sectorsize) {
 619                 /* Read a block */
 620                 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
 621                 if (!bh)
 622                         break;
 623
 624                 /* Look for ISO  descriptors */
 625                 vsd = (struct volStructDesc *)(bh->b_data +
 626                                               (sector & (sb->s_blocksize - 1)));
 627
 628                 if (vsd->stdIdent[0] == 0) {
 629                         brelse(bh);
 630                         break;
 631                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
 632                                     VSD_STD_ID_LEN)) {
 633                         iso9660 = sector;
 634                         switch (vsd->structType) {
 635                         case 0:
 636                                 udf_debug("ISO9660 Boot Record found\n");
 637                                 break;
 638                         case 1:
 639                                 udf_debug("ISO9660 Primary Volume Descriptor "
 640                                           "found\n");
 641                                 break;
 642                         case 2:
 643                                 udf_debug("ISO9660 Supplementary Volume "
 644                                           "Descriptor found\n");
 645                                 break;
 646                         case 3:
 647                                 udf_debug("ISO9660 Volume Partition Descriptor "
 648                                           "found\n");
 649                                 break;
 650                         case 255:
 651                                 udf_debug("ISO9660 Volume Descriptor Set "
 652                                           "Terminator found\n");
 653                                 break;
 654                         default:
 655                                 udf_debug("ISO9660 VRS (%u) found\n",
 656                                           vsd->structType);
 657                                 break;
 658                         }
 659                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
 660                                     VSD_STD_ID_LEN))
 661                         ; /* nothing */
 662                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
 663                                     VSD_STD_ID_LEN)) {
 664                         brelse(bh);
 665                         break;
 666                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
 667                                     VSD_STD_ID_LEN))
 668                         nsr02 = sector;
 669                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
 670                                     VSD_STD_ID_LEN))
 671                         nsr03 = sector;
 672                 brelse(bh);
 673         }
 674
 675         if (nsr03)
 676                 return nsr03;
 677         else if (nsr02)
 678                 return nsr02;
 679         else if (sector - (sbi->s_session << sb->s_blocksize_bits) == 32768)
 680                 return -1;
 681         else
 682                 return 0;
 683 }
 684
 685 /*
 686  * udf_find_anchor
 687  *
 688  * PURPOSE
 689  *      Find an anchor volume descriptor.
 690  *
 691  * PRE-CONDITIONS
 692  *      sb                      Pointer to _locked_ superblock.
 693  *      lastblock               Last block on media.
 694  *
 695  * POST-CONDITIONS
 696  *      <return>                1 if not found, 0 if ok
 697  *
 698  * HISTORY
 699  *      July 1, 1997 - Andrew E. Mileski
 700  *      Written, tested, and released.
 701  */
 702 static void udf_find_anchor(struct super_block *sb)
 703 {
 704         int lastblock;
 705         struct buffer_head *bh = NULL;
 706         uint16_t ident;
 707         uint32_t location;
 708         int i;
 709         struct udf_sb_info *sbi;
 710
 711         sbi = UDF_SB(sb);
 712         lastblock = sbi->s_last_block;
 713
 714         if (lastblock) {
 715                 int varlastblock = udf_variable_to_fixed(lastblock);
 716                 int last[] =  { lastblock, lastblock - 2,
 717                                 lastblock - 150, lastblock - 152,
 718                                 varlastblock, varlastblock - 2,
 719                                 varlastblock - 150, varlastblock - 152 };
 720
 721                 lastblock = 0;
 722
 723                 /* Search for an anchor volume descriptor pointer */
 724
 725                 /*  according to spec, anchor is in either:
 726                  *     block 256
 727                  *     lastblock-256
 728                  *     lastblock
 729                  *  however, if the disc isn't closed, it could be 512 */
 730
 731                 for (i = 0; !lastblock && i < ARRAY_SIZE(last); i++) {
 732                         ident = location = 0;
 733                         if (last[i] >= 0) {
 734                                 bh = sb_bread(sb, last[i]);
 735                                 if (bh) {
 736                                         tag *t = (tag *)bh->b_data;
 737                                         ident = le16_to_cpu(t->tagIdent);
 738                                         location = le32_to_cpu(t->tagLocation);
 739                                         brelse(bh);
 740                                 }
 741                         }
 742
 743                         if (ident == TAG_IDENT_AVDP) {
 744                                 if (location == last[i] - sbi->s_session) {
 745                                         lastblock = last[i] - sbi->s_session;
 746                                         sbi->s_anchor[0] = lastblock;
 747                                         sbi->s_anchor[1] = lastblock - 256;
 748                                 } else if (location ==
 749                                                 udf_variable_to_fixed(last[i]) -
 750                                                         sbi->s_session) {
 751                                         UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
 752                                         lastblock =
 753                                                 udf_variable_to_fixed(last[i]) -
 754                                                         sbi->s_session;
 755                                         sbi->s_anchor[0] = lastblock;
 756                                         sbi->s_anchor[1] = lastblock - 256 -
 757                                                                 sbi->s_session;
 758                                 } else {
 759                                         udf_debug("Anchor found at block %d, "
 760                                                   "location mismatch %d.\n",
 761                                                   last[i], location);
 762                                 }
 763                         } else if (ident == TAG_IDENT_FE ||
 764                                         ident == TAG_IDENT_EFE) {
 765                                 lastblock = last[i];
 766                                 sbi->s_anchor[3] = 512;
 767                         } else {
 768                                 ident = location = 0;
 769                                 if (last[i] >= 256) {
 770                                         bh = sb_bread(sb, last[i] - 256);
 771                                         if (bh) {
 772                                                 tag *t = (tag *)bh->b_data;
 773                                                 ident = le16_to_cpu(
 774                                                                 t->tagIdent);
 775                                                 location = le32_to_cpu(
 776                                                                 t->tagLocation);
 777                                                 brelse(bh);
 778                                         }
 779                                 }
 780
 781                                 if (ident == TAG_IDENT_AVDP &&
 782                                     location == last[i] - 256 -
 783                                                 sbi->s_session) {
 784                                         lastblock = last[i];
 785                                         sbi->s_anchor[1] = last[i] - 256;
 786                                 } else {
 787                                         ident = location = 0;
 788                                         if (last[i] >= 312 + sbi->s_session) {
 789                                                 bh = sb_bread(sb,
 790                                                                 last[i] - 312 -
 791                                                                 sbi->s_session);
 792                                                 if (bh) {
 793                                                         tag *t = (tag *)
 794                                                                  bh->b_data;
 795                                                         ident = le16_to_cpu(
 796                                                                 t->tagIdent);
 797                                                         location = le32_to_cpu(
 798                                                                 t->tagLocation);
 799                                                         brelse(bh);
 800                                                 }
 801                                         }
 802
 803                                         if (ident == TAG_IDENT_AVDP &&
 804                                             location == udf_variable_to_fixed(last[i]) - 256) {
 805                                                 UDF_SET_FLAG(sb,
 806                                                              UDF_FLAG_VARCONV);
 807                                                 lastblock = udf_variable_to_fixed(last[i]);
 808                                                 sbi->s_anchor[1] = lastblock - 256;
 809                                         }
 810                                 }
 811                         }
 812                 }
 813         }
 814
 815         if (!lastblock) {
 816                 /* We haven't found the lastblock. check 312 */
 817                 bh = sb_bread(sb, 312 + sbi->s_session);
 818                 if (bh) {
 819                         tag *t = (tag *)bh->b_data;
 820                         ident = le16_to_cpu(t->tagIdent);
 821                         location = le32_to_cpu(t->tagLocation);
 822                         brelse(bh);
 823
 824                         if (ident == TAG_IDENT_AVDP && location == 256)
 825                                 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
 826                 }
 827         }
 828
 829         for (i = 0; i < ARRAY_SIZE(sbi->s_anchor); i++) {
 830                 if (sbi->s_anchor[i]) {
 831                         bh = udf_read_tagged(sb, sbi->s_anchor[i],
 832                                              sbi->s_anchor[i], &ident);
 833                         if (!bh)
 834                                 sbi->s_anchor[i] = 0;
 835                         else {
 836                                 brelse(bh);
 837                                 if ((ident != TAG_IDENT_AVDP) &&
 838                                     (i || (ident != TAG_IDENT_FE &&
 839                                            ident != TAG_IDENT_EFE)))
 840                                         sbi->s_anchor[i] = 0;
 841                         }
 842                 }
 843         }
 844
 845         sbi->s_last_block = lastblock;
 846 }
 847
 848 static int udf_find_fileset(struct super_block *sb,
 849                             kernel_lb_addr *fileset,
 850                             kernel_lb_addr *root)
 851 {
 852         struct buffer_head *bh = NULL;
 853         long lastblock;
 854         uint16_t ident;
 855         struct udf_sb_info *sbi;
 856
 857         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
 858             fileset->partitionReferenceNum != 0xFFFF) {
 859                 bh = udf_read_ptagged(sb, *fileset, 0, &ident);
 860
 861                 if (!bh) {
 862                         return 1;
 863                 } else if (ident != TAG_IDENT_FSD) {
 864                         brelse(bh);
 865                         return 1;
 866                 }
 867
 868         }
 869
 870         sbi = UDF_SB(sb);
 871         if (!bh) {
 872                 /* Search backwards through the partitions */
 873                 kernel_lb_addr newfileset;
 874
 875 /* --> cvg: FIXME - is it reasonable? */
 876                 return 1;
 877
 878                 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
 879                      (newfileset.partitionReferenceNum != 0xFFFF &&
 880                       fileset->logicalBlockNum == 0xFFFFFFFF &&
 881                       fileset->partitionReferenceNum == 0xFFFF);
 882                      newfileset.partitionReferenceNum--) {
 883                         lastblock = sbi->s_partmaps
 884                                         [newfileset.partitionReferenceNum]
 885                                                 .s_partition_len;
 886                         newfileset.logicalBlockNum = 0;
 887
 888                         do {
 889                                 bh = udf_read_ptagged(sb, newfileset, 0,
 890                                                       &ident);
 891                                 if (!bh) {
 892                                         newfileset.logicalBlockNum++;
 893                                         continue;
 894                                 }
 895
 896                                 switch (ident) {
 897                                 case TAG_IDENT_SBD:
 898                                 {
 899                                         struct spaceBitmapDesc *sp;
 900                                         sp = (struct spaceBitmapDesc *)
 901                                                                 bh->b_data;
 902                                         newfileset.logicalBlockNum += 1 +
 903                                                 ((le32_to_cpu(sp->numOfBytes) +
 904                                                   sizeof(struct spaceBitmapDesc)
 905                                                   - 1) >> sb->s_blocksize_bits);
 906                                         brelse(bh);
 907                                         break;
 908                                 }
 909                                 case TAG_IDENT_FSD:
 910                                         *fileset = newfileset;
 911                                         break;
 912                                 default:
 913                                         newfileset.logicalBlockNum++;
 914                                         brelse(bh);
 915                                         bh = NULL;
 916                                         break;
 917                                 }
 918                         } while (newfileset.logicalBlockNum < lastblock &&
 919                                  fileset->logicalBlockNum == 0xFFFFFFFF &&
 920                                  fileset->partitionReferenceNum == 0xFFFF);
 921                 }
 922         }
 923
 924         if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
 925              fileset->partitionReferenceNum != 0xFFFF) && bh) {
 926                 udf_debug("Fileset at block=%d, partition=%d\n",
 927                           fileset->logicalBlockNum,
 928                           fileset->partitionReferenceNum);
 929
 930                 sbi->s_partition = fileset->partitionReferenceNum;
 931                 udf_load_fileset(sb, bh, root);
 932                 brelse(bh);
 933                 return 0;
 934         }
 935         return 1;
 936 }
 937
 938 static void udf_load_pvoldesc(struct super_block *sb, struct buffer_head *bh)
 939 {
 940         struct primaryVolDesc *pvoldesc;
 941         struct ustr instr;
 942         struct ustr outstr;
 943
 944         pvoldesc = (struct primaryVolDesc *)bh->b_data;
 945
 946         if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
 947                               pvoldesc->recordingDateAndTime)) {
 948                 kernel_timestamp ts;
 949                 ts = lets_to_cpu(pvoldesc->recordingDateAndTime);
 950                 udf_debug("recording time %04u/%02u/%02u"
 951                           " %02u:%02u (%x)\n",
 952                           ts.year, ts.month, ts.day, ts.hour,
 953                           ts.minute, ts.typeAndTimezone);
 954         }
 955
 956         if (!udf_build_ustr(&instr, pvoldesc->volIdent, 32))
 957                 if (udf_CS0toUTF8(&outstr, &instr)) {
 958                         strncpy(UDF_SB(sb)->s_volume_ident, outstr.u_name,
 959                                 outstr.u_len > 31 ? 31 : outstr.u_len);
 960                         udf_debug("volIdent[] = '%s'\n",
 961                                         UDF_SB(sb)->s_volume_ident);
 962                 }
 963
 964         if (!udf_build_ustr(&instr, pvoldesc->volSetIdent, 128))
 965                 if (udf_CS0toUTF8(&outstr, &instr))
 966                         udf_debug("volSetIdent[] = '%s'\n", outstr.u_name);
 967 }
 968
 969 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
 970                              kernel_lb_addr *root)
 971 {
 972         struct fileSetDesc *fset;
 973
 974         fset = (struct fileSetDesc *)bh->b_data;
 975
 976         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
 977
 978         UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
 979
 980         udf_debug("Rootdir at block=%d, partition=%d\n",
 981                   root->logicalBlockNum, root->partitionReferenceNum);
 982 }
 983
 984 int udf_compute_nr_groups(struct super_block *sb, u32 partition)
 985 {
 986         struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
 987         return DIV_ROUND_UP(map->s_partition_len +
 988                             (sizeof(struct spaceBitmapDesc) << 3),
 989                             sb->s_blocksize * 8);
 990 }
 991
 992 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
 993 {
 994         struct udf_bitmap *bitmap;
 995         int nr_groups;
 996         int size;
 997
 998         nr_groups = udf_compute_nr_groups(sb, index);
 999         size = sizeof(struct udf_bitmap) +
1000                 (sizeof(struct buffer_head *) * nr_groups);
1001
1002         if (size <= PAGE_SIZE)
1003                 bitmap = kmalloc(size, GFP_KERNEL);
1004         else
1005                 bitmap = vmalloc(size); /* TODO: get rid of vmalloc */
1006
1007         if (bitmap == NULL) {
1008                 udf_error(sb, __FUNCTION__,
1009                           "Unable to allocate space for bitmap "
1010                           "and %d buffer_head pointers", nr_groups);
1011                 return NULL;
1012         }
1013
1014         memset(bitmap, 0x00, size);
1015         bitmap->s_block_bitmap = (struct buffer_head **)(bitmap + 1);
1016         bitmap->s_nr_groups = nr_groups;
1017         return bitmap;
1018 }
1019
1020 static int udf_load_partdesc(struct super_block *sb, struct buffer_head *bh)
1021 {
1022         struct partitionDesc *p;
1023         int i;
1024         struct udf_part_map *map;
1025         struct udf_sb_info *sbi;
1026
1027         p = (struct partitionDesc *)bh->b_data;
1028         sbi = UDF_SB(sb);
1029
1030         for (i = 0; i < sbi->s_partitions; i++) {
1031                 map = &sbi->s_partmaps[i];
1032                 udf_debug("Searching map: (%d == %d)\n",
1033                           map->s_partition_num,
1034                           le16_to_cpu(p->partitionNumber));
1035                 if (map->s_partition_num ==
1036                                 le16_to_cpu(p->partitionNumber)) {
1037                         map->s_partition_len =
1038                                 le32_to_cpu(p->partitionLength); /* blocks */
1039                         map->s_partition_root =
1040                                 le32_to_cpu(p->partitionStartingLocation);
1041                         if (p->accessType ==
1042                                         cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
1043                                 map->s_partition_flags |=
1044                                                 UDF_PART_FLAG_READ_ONLY;
1045                         if (p->accessType ==
1046                                         cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
1047                                 map->s_partition_flags |=
1048                                                 UDF_PART_FLAG_WRITE_ONCE;
1049                         if (p->accessType ==
1050                                         cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
1051                                 map->s_partition_flags |=
1052                                                 UDF_PART_FLAG_REWRITABLE;
1053                         if (p->accessType ==
1054                                     cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
1055                                 map->s_partition_flags |=
1056                                                 UDF_PART_FLAG_OVERWRITABLE;
1057
1058                         if (!strcmp(p->partitionContents.ident,
1059                                     PD_PARTITION_CONTENTS_NSR02) ||
1060                             !strcmp(p->partitionContents.ident,
1061                                     PD_PARTITION_CONTENTS_NSR03)) {
1062                                 struct partitionHeaderDesc *phd;
1063
1064                                 phd = (struct partitionHeaderDesc *)
1065                                                 (p->partitionContentsUse);
1066                                 if (phd->unallocSpaceTable.extLength) {
1067                                         kernel_lb_addr loc = {
1068                                                 .logicalBlockNum = le32_to_cpu(phd->unallocSpaceTable.extPosition),
1069                                                 .partitionReferenceNum = i,
1070                                         };
1071
1072                                         map->s_uspace.s_table =
1073                                                 udf_iget(sb, loc);
1074                                         if (!map->s_uspace.s_table) {
1075                                                 udf_debug("cannot load unallocSpaceTable (part %d)\n", i);
1076                                                 return 1;
1077                                         }
1078                                         map->s_partition_flags |=
1079                                                 UDF_PART_FLAG_UNALLOC_TABLE;
1080                                         udf_debug("unallocSpaceTable (part %d) @ %ld\n",
1081                                                   i, map->s_uspace.s_table->i_ino);
1082                                 }
1083                                 if (phd->unallocSpaceBitmap.extLength) {
1084                                         struct udf_bitmap *bitmap =
1085                                                 udf_sb_alloc_bitmap(sb, i);
1086                                         map->s_uspace.s_bitmap = bitmap;
1087                                         if (bitmap != NULL) {
1088                                                 bitmap->s_extLength =
1089                                                         le32_to_cpu(phd->unallocSpaceBitmap.extLength);
1090                                                 bitmap->s_extPosition =
1091                                                         le32_to_cpu(phd->unallocSpaceBitmap.extPosition);
1092                                                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1093                                                 udf_debug("unallocSpaceBitmap (part %d) @ %d\n",
1094                                                           i, bitmap->s_extPosition);
1095                                         }
1096                                 }
1097                                 if (phd->partitionIntegrityTable.extLength)
1098                                         udf_debug("partitionIntegrityTable (part %d)\n", i);
1099                                 if (phd->freedSpaceTable.extLength) {
1100                                         kernel_lb_addr loc = {
1101                                                 .logicalBlockNum = le32_to_cpu(phd->freedSpaceTable.extPosition),
1102                                                 .partitionReferenceNum = i,
1103                                         };
1104
1105                                         map->s_fspace.s_table =
1106                                                 udf_iget(sb, loc);
1107                                         if (!map->s_fspace.s_table) {
1108                                                 udf_debug("cannot load freedSpaceTable (part %d)\n", i);
1109                                                 return 1;
1110                                         }
1111                                         map->s_partition_flags |=
1112                                                 UDF_PART_FLAG_FREED_TABLE;
1113                                         udf_debug("freedSpaceTable (part %d) @ %ld\n",
1114                                                   i, map->s_fspace.s_table->i_ino);
1115                                 }
1116                                 if (phd->freedSpaceBitmap.extLength) {
1117                                         struct udf_bitmap *bitmap =
1118                                                 udf_sb_alloc_bitmap(sb, i);
1119                                         map->s_fspace.s_bitmap = bitmap;
1120                                         if (bitmap != NULL) {
1121                                                 bitmap->s_extLength =
1122                                                         le32_to_cpu(phd->freedSpaceBitmap.extLength);
1123                                                 bitmap->s_extPosition =
1124                                                         le32_to_cpu(phd->freedSpaceBitmap.extPosition);
1125                                                 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1126                                                 udf_debug("freedSpaceBitmap (part %d) @ %d\n",
1127                                                           i, bitmap->s_extPosition);
1128                                         }
1129                                 }
1130                         }
1131                         break;
1132                 }
1133         }
1134         if (i == sbi->s_partitions)
1135                 udf_debug("Partition (%d) not found in partition map\n",
1136                           le16_to_cpu(p->partitionNumber));
1137         else
1138                 udf_debug("Partition (%d:%d type %x) starts at physical %d, "
1139                           "block length %d\n",
1140                           le16_to_cpu(p->partitionNumber), i,
1141                           map->s_partition_type,
1142                           map->s_partition_root,
1143                           map->s_partition_len);
1144         return 0;
1145 }
1146
1147 static int udf_load_logicalvol(struct super_block *sb, struct buffer_head *bh,
1148                                kernel_lb_addr *fileset)
1149 {
1150         struct logicalVolDesc *lvd;
1151         int i, j, offset;
1152         uint8_t type;
1153         struct udf_sb_info *sbi = UDF_SB(sb);
1154         struct genericPartitionMap *gpm;
1155
1156         lvd = (struct logicalVolDesc *)bh->b_data;
1157
1158         i = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1159         if (i != 0)
1160                 return i;
1161
1162         for (i = 0, offset = 0;
1163              i < sbi->s_partitions && offset < le32_to_cpu(lvd->mapTableLength);
1164              i++, offset += gpm->partitionMapLength) {
1165                 struct udf_part_map *map = &sbi->s_partmaps[i];
1166                 gpm = (struct genericPartitionMap *)
1167                                 &(lvd->partitionMaps[offset]);
1168                 type = gpm->partitionMapType;
1169                 if (type == 1) {
1170                         struct genericPartitionMap1 *gpm1 =
1171                                 (struct genericPartitionMap1 *)gpm;
1172                         map->s_partition_type = UDF_TYPE1_MAP15;
1173                         map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1174                         map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1175                         map->s_partition_func = NULL;
1176                 } else if (type == 2) {
1177                         struct udfPartitionMap2 *upm2 =
1178                                                 (struct udfPartitionMap2 *)gpm;
1179                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1180                                                 strlen(UDF_ID_VIRTUAL))) {
1181                                 u16 suf =
1182                                         le16_to_cpu(((__le16 *)upm2->partIdent.
1183                                                         identSuffix)[0]);
1184                                 if (suf == 0x0150) {
1185                                         map->s_partition_type =
1186                                                         UDF_VIRTUAL_MAP15;
1187                                         map->s_partition_func =
1188                                                         udf_get_pblock_virt15;
1189                                 } else if (suf == 0x0200) {
1190                                         map->s_partition_type =
1191                                                         UDF_VIRTUAL_MAP20;
1192                                         map->s_partition_func =
1193                                                         udf_get_pblock_virt20;
1194                                 }
1195                         } else if (!strncmp(upm2->partIdent.ident,
1196                                                 UDF_ID_SPARABLE,
1197                                                 strlen(UDF_ID_SPARABLE))) {
1198                                 uint32_t loc;
1199                                 uint16_t ident;
1200                                 struct sparingTable *st;
1201                                 struct sparablePartitionMap *spm =
1202                                         (struct sparablePartitionMap *)gpm;
1203
1204                                 map->s_partition_type = UDF_SPARABLE_MAP15;
1205                                 map->s_type_specific.s_sparing.s_packet_len =
1206                                                 le16_to_cpu(spm->packetLength);
1207                                 for (j = 0; j < spm->numSparingTables; j++) {
1208                                         struct buffer_head *bh2;
1209
1210                                         loc = le32_to_cpu(
1211                                                 spm->locSparingTable[j]);
1212                                         bh2 = udf_read_tagged(sb, loc, loc,
1213                                                              &ident);
1214                                         map->s_type_specific.s_sparing.
1215                                                         s_spar_map[j] = bh2;
1216
1217                                         if (bh2 != NULL) {
1218                                                 st = (struct sparingTable *)
1219                                                                 bh2->b_data;
1220                                                 if (ident != 0 || strncmp(
1221                                                         st->sparingIdent.ident,
1222                                                         UDF_ID_SPARING,
1223                                                         strlen(UDF_ID_SPARING))) {
1224                                                         brelse(bh2);
1225                                                         map->s_type_specific.
1226                                                                 s_sparing.
1227                                                                 s_spar_map[j] =
1228                                                                         NULL;
1229                                                 }
1230                                         }
1231                                 }
1232                                 map->s_partition_func = udf_get_pblock_spar15;
1233                         } else {
1234                                 udf_debug("Unknown ident: %s\n",
1235                                           upm2->partIdent.ident);
1236                                 continue;
1237                         }
1238                         map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1239                         map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1240                 }
1241                 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1242                           i, map->s_partition_num, type,
1243                           map->s_volumeseqnum);
1244         }
1245
1246         if (fileset) {
1247                 long_ad *la = (long_ad *)&(lvd->logicalVolContentsUse[0]);
1248
1249                 *fileset = lelb_to_cpu(la->extLocation);
1250                 udf_debug("FileSet found in LogicalVolDesc at block=%d, "
1251                           "partition=%d\n", fileset->logicalBlockNum,
1252                           fileset->partitionReferenceNum);
1253         }
1254         if (lvd->integritySeqExt.extLength)
1255                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1256
1257         return 0;
1258 }
1259
1260 /*
1261  * udf_load_logicalvolint
1262  *
1263  */
1264 static void udf_load_logicalvolint(struct super_block *sb, kernel_extent_ad loc)
1265 {
1266         struct buffer_head *bh = NULL;
1267         uint16_t ident;
1268         struct udf_sb_info *sbi = UDF_SB(sb);
1269         struct logicalVolIntegrityDesc *lvid;
1270
1271         while (loc.extLength > 0 &&
1272                (bh = udf_read_tagged(sb, loc.extLocation,
1273                                      loc.extLocation, &ident)) &&
1274                ident == TAG_IDENT_LVID) {
1275                 sbi->s_lvid_bh = bh;
1276                 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1277
1278                 if (lvid->nextIntegrityExt.extLength)
1279                         udf_load_logicalvolint(sb,
1280                                 leea_to_cpu(lvid->nextIntegrityExt));
1281
1282                 if (sbi->s_lvid_bh != bh)
1283                         brelse(bh);
1284                 loc.extLength -= sb->s_blocksize;
1285                 loc.extLocation++;
1286         }
1287         if (sbi->s_lvid_bh != bh)
1288                 brelse(bh);
1289 }
1290
1291 /*
1292  * udf_process_sequence
1293  *
1294  * PURPOSE
1295  *      Process a main/reserve volume descriptor sequence.
1296  *
1297  * PRE-CONDITIONS
1298  *      sb                      Pointer to _locked_ superblock.
1299  *      block                   First block of first extent of the sequence.
1300  *      lastblock               Lastblock of first extent of the sequence.
1301  *
1302  * HISTORY
1303  *      July 1, 1997 - Andrew E. Mileski
1304  *      Written, tested, and released.
1305  */
1306 static int udf_process_sequence(struct super_block *sb, long block,
1307                                 long lastblock, kernel_lb_addr *fileset)
1308 {
1309         struct buffer_head *bh = NULL;
1310         struct udf_vds_record vds[VDS_POS_LENGTH];
1311         struct udf_vds_record *curr;
1312         struct generic_desc *gd;
1313         struct volDescPtr *vdp;
1314         int done = 0;
1315         int i, j;
1316         uint32_t vdsn;
1317         uint16_t ident;
1318         long next_s = 0, next_e = 0;
1319
1320         memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1321
1322         /* Read the main descriptor sequence */
1323         for (; (!done && block <= lastblock); block++) {
1324
1325                 bh = udf_read_tagged(sb, block, block, &ident);
1326                 if (!bh)
1327                         break;
1328
1329                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1330                 gd = (struct generic_desc *)bh->b_data;
1331                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1332                 switch (ident) {
1333                 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1334                         curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1335                         if (vdsn >= curr->volDescSeqNum) {
1336                                 curr->volDescSeqNum = vdsn;
1337                                 curr->block = block;
1338                         }
1339                         break;
1340                 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1341                         curr = &vds[VDS_POS_VOL_DESC_PTR];
1342                         if (vdsn >= curr->volDescSeqNum) {
1343                                 curr->volDescSeqNum = vdsn;
1344                                 curr->block = block;
1345
1346                                 vdp = (struct volDescPtr *)bh->b_data;
1347                                 next_s = le32_to_cpu(
1348                                         vdp->nextVolDescSeqExt.extLocation);
1349                                 next_e = le32_to_cpu(
1350                                         vdp->nextVolDescSeqExt.extLength);
1351                                 next_e = next_e >> sb->s_blocksize_bits;
1352                                 next_e += next_s;
1353                         }
1354                         break;
1355                 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1356                         curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1357                         if (vdsn >= curr->volDescSeqNum) {
1358                                 curr->volDescSeqNum = vdsn;
1359                                 curr->block = block;
1360                         }
1361                         break;
1362                 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1363                         curr = &vds[VDS_POS_PARTITION_DESC];
1364                         if (!curr->block)
1365                                 curr->block = block;
1366                         break;
1367                 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1368                         curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1369                         if (vdsn >= curr->volDescSeqNum) {
1370                                 curr->volDescSeqNum = vdsn;
1371                                 curr->block = block;
1372                         }
1373                         break;
1374                 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1375                         curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1376                         if (vdsn >= curr->volDescSeqNum) {
1377                                 curr->volDescSeqNum = vdsn;
1378                                 curr->block = block;
1379                         }
1380                         break;
1381                 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1382                         vds[VDS_POS_TERMINATING_DESC].block = block;
1383                         if (next_e) {
1384                                 block = next_s;
1385                                 lastblock = next_e;
1386                                 next_s = next_e = 0;
1387                         } else
1388                                 done = 1;
1389                         break;
1390                 }
1391                 brelse(bh);
1392         }
1393         for (i = 0; i < VDS_POS_LENGTH; i++) {
1394                 if (vds[i].block) {
1395                         bh = udf_read_tagged(sb, vds[i].block, vds[i].block,
1396                                              &ident);
1397
1398                         if (i == VDS_POS_PRIMARY_VOL_DESC) {
1399                                 udf_load_pvoldesc(sb, bh);
1400                         } else if (i == VDS_POS_LOGICAL_VOL_DESC) {
1401                                 if (udf_load_logicalvol(sb, bh, fileset)) {
1402                                         brelse(bh);
1403                                         return 1;
1404                                 }
1405                         } else if (i == VDS_POS_PARTITION_DESC) {
1406                                 struct buffer_head *bh2 = NULL;
1407                                 if (udf_load_partdesc(sb, bh)) {
1408                                         brelse(bh);
1409                                         return 1;
1410                                 }
1411                                 for (j = vds[i].block + 1;
1412                                      j <  vds[VDS_POS_TERMINATING_DESC].block;
1413                                      j++) {
1414                                         bh2 = udf_read_tagged(sb, j, j, &ident);
1415                                         gd = (struct generic_desc *)bh2->b_data;
1416                                         if (ident == TAG_IDENT_PD)
1417                                                 if (udf_load_partdesc(sb,
1418                                                                       bh2)) {
1419                                                         brelse(bh);
1420                                                         brelse(bh2);
1421                                                         return 1;
1422                                                 }
1423                                         brelse(bh2);
1424                                 }
1425                         }
1426                         brelse(bh);
1427                 }
1428         }
1429
1430         return 0;
1431 }
1432
1433 /*
1434  * udf_check_valid()
1435  */
1436 static int udf_check_valid(struct super_block *sb, int novrs, int silent)
1437 {
1438         long block;
1439
1440         if (novrs) {
1441                 udf_debug("Validity check skipped because of novrs option\n");
1442                 return 0;
1443         }
1444         /* Check that it is NSR02 compliant */
1445         /* Process any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
1446         else {
1447                 block = udf_vrs(sb, silent);
1448                 if (block == -1) {
1449                         struct udf_sb_info *sbi = UDF_SB(sb);
1450                         udf_debug("Failed to read byte 32768. Assuming open "
1451                                   "disc. Skipping validity check\n");
1452                         if (!sbi->s_last_block)
1453                                 sbi->s_last_block = udf_get_last_block(sb);
1454                         return 0;
1455                 } else
1456                         return !block;
1457         }
1458 }
1459
1460 static int udf_load_partition(struct super_block *sb, kernel_lb_addr *fileset)
1461 {
1462         struct anchorVolDescPtr *anchor;
1463         uint16_t ident;
1464         struct buffer_head *bh;
1465         long main_s, main_e, reserve_s, reserve_e;
1466         int i, j;
1467         struct udf_sb_info *sbi;
1468
1469         if (!sb)
1470                 return 1;
1471         sbi = UDF_SB(sb);
1472
1473         for (i = 0; i < ARRAY_SIZE(sbi->s_anchor); i++) {
1474                 if (!sbi->s_anchor[i])
1475                         continue;
1476                 bh = udf_read_tagged(sb, sbi->s_anchor[i], sbi->s_anchor[i],
1477                                      &ident);
1478                 if (!bh)
1479                         continue;
1480
1481                 anchor = (struct anchorVolDescPtr *)bh->b_data;
1482
1483                 /* Locate the main sequence */
1484                 main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1485                 main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1486                 main_e = main_e >> sb->s_blocksize_bits;
1487                 main_e += main_s;
1488
1489                 /* Locate the reserve sequence */
1490                 reserve_s = le32_to_cpu(
1491                                 anchor->reserveVolDescSeqExt.extLocation);
1492                 reserve_e = le32_to_cpu(
1493                                 anchor->reserveVolDescSeqExt.extLength);
1494                 reserve_e = reserve_e >> sb->s_blocksize_bits;
1495                 reserve_e += reserve_s;
1496
1497                 brelse(bh);
1498
1499                 /* Process the main & reserve sequences */
1500                 /* responsible for finding the PartitionDesc(s) */
1501                 if (!(udf_process_sequence(sb, main_s, main_e,
1502                                            fileset) &&
1503                       udf_process_sequence(sb, reserve_s, reserve_e,
1504                                            fileset)))
1505                         break;
1506         }
1507
1508         if (i == ARRAY_SIZE(sbi->s_anchor)) {
1509                 udf_debug("No Anchor block found\n");
1510                 return 1;
1511         }
1512         udf_debug("Using anchor in block %d\n", sbi->s_anchor[i]);
1513
1514         for (i = 0; i < sbi->s_partitions; i++) {
1515                 kernel_lb_addr uninitialized_var(ino);
1516                 struct udf_part_map *map = &sbi->s_partmaps[i];
1517                 switch (map->s_partition_type) {
1518                 case UDF_VIRTUAL_MAP15:
1519                 case UDF_VIRTUAL_MAP20:
1520                         if (!sbi->s_last_block) {
1521                                 sbi->s_last_block = udf_get_last_block(sb);
1522                                 udf_find_anchor(sb);
1523                         }
1524
1525                         if (!sbi->s_last_block) {
1526                                 udf_debug("Unable to determine Lastblock (For "
1527                                           "Virtual Partition)\n");
1528                                 return 1;
1529                         }
1530
1531                         for (j = 0; j < sbi->s_partitions; j++) {
1532                                 struct udf_part_map *map2 = &sbi->s_partmaps[j];
1533                                 if (j != i &&
1534                                     map->s_volumeseqnum ==
1535                                                 map2->s_volumeseqnum &&
1536                                     map->s_partition_num ==
1537                                                 map2->s_partition_num) {
1538                                         ino.partitionReferenceNum = j;
1539                                         ino.logicalBlockNum =
1540                                                 sbi->s_last_block -
1541                                                         map2->s_partition_root;
1542                                         break;
1543                                 }
1544                         }
1545
1546                         if (j == sbi->s_partitions)
1547                                 return 1;
1548
1549                         sbi->s_vat_inode = udf_iget(sb, ino);
1550                         if (!sbi->s_vat_inode)
1551                                 return 1;
1552
1553                         if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1554                                 map->s_type_specific.s_virtual.s_start_offset =
1555                                         udf_ext0_offset(sbi->s_vat_inode);
1556                                 map->s_type_specific.s_virtual.s_num_entries =
1557                                         (sbi->s_vat_inode->i_size - 36) >> 2;
1558                         } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1559                                 uint32_t pos;
1560                                 struct virtualAllocationTable20 *vat20;
1561
1562                                 pos = udf_block_map(sbi->s_vat_inode, 0);
1563                                 bh = sb_bread(sb, pos);
1564                                 if (!bh)
1565                                         return 1;
1566                                 vat20 = (struct virtualAllocationTable20 *)
1567                                         bh->b_data +
1568                                         udf_ext0_offset(sbi->s_vat_inode);
1569                                 map->s_type_specific.s_virtual.s_start_offset =
1570                                         le16_to_cpu(vat20->lengthHeader) +
1571                                         udf_ext0_offset(sbi->s_vat_inode);
1572                                 map->s_type_specific.s_virtual.s_num_entries =
1573                                         (sbi->s_vat_inode->i_size -
1574                                          map->s_type_specific.s_virtual.
1575                                                         s_start_offset) >> 2;
1576                                 brelse(bh);
1577                         }
1578                         map->s_partition_root = udf_get_pblock(sb, 0, i, 0);
1579                         map->s_partition_len =
1580                                 sbi->s_partmaps[ino.partitionReferenceNum].
1581                                                                 s_partition_len;
1582                 }
1583         }
1584         return 0;
1585 }
1586
1587 static void udf_open_lvid(struct super_block *sb)
1588 {
1589         struct udf_sb_info *sbi = UDF_SB(sb);
1590         struct buffer_head *bh = sbi->s_lvid_bh;
1591         if (bh) {
1592                 struct logicalVolIntegrityDesc *lvid =
1593                                 (struct logicalVolIntegrityDesc *)bh->b_data;
1594                 struct logicalVolIntegrityDescImpUse *lvidiu =
1595                                                         udf_sb_lvidiu(sbi);
1596
1597                 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1598                 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1599                 udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
1600                                         CURRENT_TIME);
1601                 lvid->integrityType = LVID_INTEGRITY_TYPE_OPEN;
1602
1603                 lvid->descTag.descCRC = cpu_to_le16(
1604                         udf_crc((char *)lvid + sizeof(tag),
1605                                 le16_to_cpu(lvid->descTag.descCRCLength),
1606                                 0));
1607
1608                 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1609                 mark_buffer_dirty(bh);
1610         }
1611 }
1612
1613 static void udf_close_lvid(struct super_block *sb)
1614 {
1615         struct udf_sb_info *sbi = UDF_SB(sb);
1616         struct buffer_head *bh = sbi->s_lvid_bh;
1617         struct logicalVolIntegrityDesc *lvid;
1618
1619         if (!bh)
1620                 return;
1621
1622         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1623
1624         if (lvid->integrityType == LVID_INTEGRITY_TYPE_OPEN) {
1625                 struct logicalVolIntegrityDescImpUse *lvidiu =
1626                                                         udf_sb_lvidiu(sbi);
1627                 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1628                 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1629                 udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
1630                                         CURRENT_TIME);
1631                 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1632                         lvidiu->maxUDFWriteRev =
1633                                         cpu_to_le16(UDF_MAX_WRITE_VERSION);
1634                 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1635                         lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1636                 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
1637                         lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
1638                 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1639
1640                 lvid->descTag.descCRC = cpu_to_le16(
1641                         udf_crc((char *)lvid + sizeof(tag),
1642                                 le16_to_cpu(lvid->descTag.descCRCLength),
1643                                 0));
1644
1645                 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1646                 mark_buffer_dirty(bh);
1647         }
1648 }
1649
1650 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
1651 {
1652         int i;
1653         int nr_groups = bitmap->s_nr_groups;
1654         int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
1655                                                 nr_groups);
1656
1657         for (i = 0; i < nr_groups; i++)
1658                 if (bitmap->s_block_bitmap[i])
1659                         brelse(bitmap->s_block_bitmap[i]);
1660
1661         if (size <= PAGE_SIZE)
1662                 kfree(bitmap);
1663         else
1664                 vfree(bitmap);
1665 }
1666
1667 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1668 {
1669         int i;
1670         struct inode *inode = NULL;
1671         struct udf_options uopt;
1672         kernel_lb_addr rootdir, fileset;
1673         struct udf_sb_info *sbi;
1674
1675         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1676         uopt.uid = -1;
1677         uopt.gid = -1;
1678         uopt.umask = 0;
1679
1680         sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1681         if (!sbi)
1682                 return -ENOMEM;
1683
1684         sb->s_fs_info = sbi;
1685
1686         mutex_init(&sbi->s_alloc_mutex);
1687
1688         if (!udf_parse_options((char *)options, &uopt, false))
1689                 goto error_out;
1690
1691         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1692             uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
1693                 udf_error(sb, "udf_read_super",
1694                           "utf8 cannot be combined with iocharset\n");
1695                 goto error_out;
1696         }
1697 #ifdef CONFIG_UDF_NLS
1698         if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1699                 uopt.nls_map = load_nls_default();
1700                 if (!uopt.nls_map)
1701                         uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1702                 else
1703                         udf_debug("Using default NLS map\n");
1704         }
1705 #endif
1706         if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1707                 uopt.flags |= (1 << UDF_FLAG_UTF8);
1708
1709         fileset.logicalBlockNum = 0xFFFFFFFF;
1710         fileset.partitionReferenceNum = 0xFFFF;
1711
1712         sbi->s_flags = uopt.flags;
1713         sbi->s_uid = uopt.uid;
1714         sbi->s_gid = uopt.gid;
1715         sbi->s_umask = uopt.umask;
1716         sbi->s_nls_map = uopt.nls_map;
1717
1718         /* Set the block size for all transfers */
1719         if (!sb_min_blocksize(sb, uopt.blocksize)) {
1720                 udf_debug("Bad block size (%d)\n", uopt.blocksize);
1721                 printk(KERN_ERR "udf: bad block size (%d)\n", uopt.blocksize);
1722                 goto error_out;
1723         }
1724
1725         if (uopt.session == 0xFFFFFFFF)
1726                 sbi->s_session = udf_get_last_session(sb);
1727         else
1728                 sbi->s_session = uopt.session;
1729
1730         udf_debug("Multi-session=%d\n", sbi->s_session);
1731
1732         sbi->s_last_block = uopt.lastblock;
1733         sbi->s_anchor[0] = sbi->s_anchor[1] = 0;
1734         sbi->s_anchor[2] = uopt.anchor;
1735         sbi->s_anchor[3] = 256;
1736
1737         if (udf_check_valid(sb, uopt.novrs, silent)) {
1738                 /* read volume recognition sequences */
1739                 printk(KERN_WARNING "UDF-fs: No VRS found\n");
1740                 goto error_out;
1741         }
1742
1743         udf_find_anchor(sb);
1744
1745         /* Fill in the rest of the superblock */
1746         sb->s_op = &udf_sb_ops;
1747         sb->dq_op = NULL;
1748         sb->s_dirt = 0;
1749         sb->s_magic = UDF_SUPER_MAGIC;
1750         sb->s_time_gran = 1000;
1751
1752         if (udf_load_partition(sb, &fileset)) {
1753                 printk(KERN_WARNING "UDF-fs: No partition found (1)\n");
1754                 goto error_out;
1755         }
1756
1757         udf_debug("Lastblock=%d\n", sbi->s_last_block);
1758
1759         if (sbi->s_lvid_bh) {
1760                 struct logicalVolIntegrityDescImpUse *lvidiu =
1761                                                         udf_sb_lvidiu(sbi);
1762                 uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
1763                 uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
1764                 /* uint16_t maxUDFWriteRev =
1765                                 le16_to_cpu(lvidiu->maxUDFWriteRev); */
1766
1767                 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
1768                         printk(KERN_ERR "UDF-fs: minUDFReadRev=%x "
1769                                         "(max is %x)\n",
1770                                le16_to_cpu(lvidiu->minUDFReadRev),
1771                                UDF_MAX_READ_VERSION);
1772                         goto error_out;
1773                 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
1774                         sb->s_flags |= MS_RDONLY;
1775
1776                 sbi->s_udfrev = minUDFWriteRev;
1777
1778                 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1779                         UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
1780                 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
1781                         UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
1782         }
1783
1784         if (!sbi->s_partitions) {
1785                 printk(KERN_WARNING "UDF-fs: No partition found (2)\n");
1786                 goto error_out;
1787         }
1788
1789         if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
1790                         UDF_PART_FLAG_READ_ONLY) {
1791                 printk(KERN_NOTICE "UDF-fs: Partition marked readonly; "
1792                                    "forcing readonly mount\n");
1793                 sb->s_flags |= MS_RDONLY;
1794         }
1795
1796         if (udf_find_fileset(sb, &fileset, &rootdir)) {
1797                 printk(KERN_WARNING "UDF-fs: No fileset found\n");
1798                 goto error_out;
1799         }
1800
1801         if (!silent) {
1802                 timestamp ts;
1803                 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
1804                 udf_info("UDF: Mounting volume '%s', "
1805                          "timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
1806                          sbi->s_volume_ident, le16_to_cpu(ts.year), ts.month, ts.day,
1807                          ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
1808         }
1809         if (!(sb->s_flags & MS_RDONLY))
1810                 udf_open_lvid(sb);
1811
1812         /* Assign the root inode */
1813         /* assign inodes by physical block number */
1814         /* perhaps it's not extensible enough, but for now ... */
1815         inode = udf_iget(sb, rootdir);
1816         if (!inode) {
1817                 printk(KERN_ERR "UDF-fs: Error in udf_iget, block=%d, "
1818                                 "partition=%d\n",
1819                        rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
1820                 goto error_out;
1821         }
1822
1823         /* Allocate a dentry for the root inode */
1824         sb->s_root = d_alloc_root(inode);
1825         if (!sb->s_root) {
1826                 printk(KERN_ERR "UDF-fs: Couldn't allocate root dentry\n");
1827                 iput(inode);
1828                 goto error_out;
1829         }
1830         sb->s_maxbytes = MAX_LFS_FILESIZE;
1831         return 0;
1832
1833 error_out:
1834         if (sbi->s_vat_inode)
1835                 iput(sbi->s_vat_inode);
1836         if (sbi->s_partitions) {
1837                 struct udf_part_map *map = &sbi->s_partmaps[sbi->s_partition];
1838                 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1839                         iput(map->s_uspace.s_table);
1840                 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1841                         iput(map->s_fspace.s_table);
1842                 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1843                         udf_sb_free_bitmap(map->s_uspace.s_bitmap);
1844                 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1845                         udf_sb_free_bitmap(map->s_fspace.s_bitmap);
1846                 if (map->s_partition_type == UDF_SPARABLE_MAP15)
1847                         for (i = 0; i < 4; i++)
1848                                 brelse(map->s_type_specific.s_sparing.
1849                                                 s_spar_map[i]);
1850         }
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                 struct udf_part_map *map = &sbi->s_partmaps[sbi->s_partition];
1904                 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1905                         iput(map->s_uspace.s_table);
1906                 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1907                         iput(map->s_fspace.s_table);
1908                 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1909                         udf_sb_free_bitmap(map->s_uspace.s_bitmap);
1910                 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1911                         udf_sb_free_bitmap(map->s_fspace.s_bitmap);
1912                 if (map->s_partition_type == UDF_SPARABLE_MAP15)
1913                         for (i = 0; i < 4; i++)
1914                                 brelse(map->s_type_specific.s_sparing.
1915                                                 s_spar_map[i]);
1916         }
1917 #ifdef CONFIG_UDF_NLS
1918         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1919                 unload_nls(sbi->s_nls_map);
1920 #endif
1921         if (!(sb->s_flags & MS_RDONLY))
1922                 udf_close_lvid(sb);
1923         brelse(sbi->s_lvid_bh);
1924         kfree(sbi->s_partmaps);
1925         kfree(sb->s_fs_info);
1926         sb->s_fs_info = NULL;
1927 }
1928
1929 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
1930 {
1931         struct super_block *sb = dentry->d_sb;
1932         struct udf_sb_info *sbi = UDF_SB(sb);
1933         struct logicalVolIntegrityDescImpUse *lvidiu;
1934
1935         if (sbi->s_lvid_bh != NULL)
1936                 lvidiu = udf_sb_lvidiu(sbi);
1937         else
1938                 lvidiu = NULL;
1939
1940         buf->f_type = UDF_SUPER_MAGIC;
1941         buf->f_bsize = sb->s_blocksize;
1942         buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
1943         buf->f_bfree = udf_count_free(sb);
1944         buf->f_bavail = buf->f_bfree;
1945         buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
1946                                           le32_to_cpu(lvidiu->numDirs)) : 0)
1947                         + buf->f_bfree;
1948         buf->f_ffree = buf->f_bfree;
1949         /* __kernel_fsid_t f_fsid */
1950         buf->f_namelen = UDF_NAME_LEN - 2;
1951
1952         return 0;
1953 }
1954
1955 static unsigned int udf_count_free_bitmap(struct super_block *sb,
1956                                           struct udf_bitmap *bitmap)
1957 {
1958         struct buffer_head *bh = NULL;
1959         unsigned int accum = 0;
1960         int index;
1961         int block = 0, newblock;
1962         kernel_lb_addr loc;
1963         uint32_t bytes;
1964         uint8_t *ptr;
1965         uint16_t ident;
1966         struct spaceBitmapDesc *bm;
1967
1968         lock_kernel();
1969
1970         loc.logicalBlockNum = bitmap->s_extPosition;
1971         loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
1972         bh = udf_read_ptagged(sb, loc, 0, &ident);
1973
1974         if (!bh) {
1975                 printk(KERN_ERR "udf: udf_count_free failed\n");
1976                 goto out;
1977         } else if (ident != TAG_IDENT_SBD) {
1978                 brelse(bh);
1979                 printk(KERN_ERR "udf: udf_count_free failed\n");
1980                 goto out;
1981         }
1982
1983         bm = (struct spaceBitmapDesc *)bh->b_data;
1984         bytes = le32_to_cpu(bm->numOfBytes);
1985         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
1986         ptr = (uint8_t *)bh->b_data;
1987
1988         while (bytes > 0) {
1989                 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
1990                 accum += bitmap_weight((const unsigned long *)(ptr + index),
1991                                         cur_bytes * 8);
1992                 bytes -= cur_bytes;
1993                 if (bytes) {
1994                         brelse(bh);
1995                         newblock = udf_get_lb_pblock(sb, loc, ++block);
1996                         bh = udf_tread(sb, newblock);
1997                         if (!bh) {
1998                                 udf_debug("read failed\n");
1999                                 goto out;
2000                         }
2001                         index = 0;
2002                         ptr = (uint8_t *)bh->b_data;
2003                 }
2004         }
2005         brelse(bh);
2006
2007 out:
2008         unlock_kernel();
2009
2010         return accum;
2011 }
2012
2013 static unsigned int udf_count_free_table(struct super_block *sb,
2014                                          struct inode *table)
2015 {
2016         unsigned int accum = 0;
2017         uint32_t elen;
2018         kernel_lb_addr eloc;
2019         int8_t etype;
2020         struct extent_position epos;
2021
2022         lock_kernel();
2023
2024         epos.block = UDF_I(table)->i_location;
2025         epos.offset = sizeof(struct unallocSpaceEntry);
2026         epos.bh = NULL;
2027
2028         while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2029                 accum += (elen >> table->i_sb->s_blocksize_bits);
2030
2031         brelse(epos.bh);
2032
2033         unlock_kernel();
2034
2035         return accum;
2036 }
2037
2038 static unsigned int udf_count_free(struct super_block *sb)
2039 {
2040         unsigned int accum = 0;
2041         struct udf_sb_info *sbi;
2042         struct udf_part_map *map;
2043
2044         sbi = UDF_SB(sb);
2045         if (sbi->s_lvid_bh) {
2046                 struct logicalVolIntegrityDesc *lvid =
2047                         (struct logicalVolIntegrityDesc *)
2048                         sbi->s_lvid_bh->b_data;
2049                 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
2050                         accum = le32_to_cpu(
2051                                         lvid->freeSpaceTable[sbi->s_partition]);
2052                         if (accum == 0xFFFFFFFF)
2053                                 accum = 0;
2054                 }
2055         }
2056
2057         if (accum)
2058                 return accum;
2059
2060         map = &sbi->s_partmaps[sbi->s_partition];
2061         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2062                 accum += udf_count_free_bitmap(sb,
2063                                                map->s_uspace.s_bitmap);
2064         }
2065         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
2066                 accum += udf_count_free_bitmap(sb,
2067                                                map->s_fspace.s_bitmap);
2068         }
2069         if (accum)
2070                 return accum;
2071
2072         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2073                 accum += udf_count_free_table(sb,
2074                                               map->s_uspace.s_table);
2075         }
2076         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
2077                 accum += udf_count_free_table(sb,
2078                                               map->s_fspace.s_table);
2079         }
2080
2081         return accum;
2082 }