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 <asm/byteorder.h>
  59
  60 #include <linux/udf_fs.h>
  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
 104 struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct udf_sb_info *sbi)
 105 {
 106         struct logicalVolIntegrityDesc *lvid =
 107                 (struct logicalVolIntegrityDesc *)sbi->s_lvid_bh->b_data;
 108         __u32 number_of_partitions = le32_to_cpu(lvid->numOfPartitions);
 109         __u32 offset = number_of_partitions * 2 *
 110                                 sizeof(uint32_t)/sizeof(uint8_t);
 111         return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
 112 }
 113
 114 /* UDF filesystem type */
 115 static int udf_get_sb(struct file_system_type *fs_type,
 116                       int flags, const char *dev_name, void *data,
 117                       struct vfsmount *mnt)
 118 {
 119         return get_sb_bdev(fs_type, flags, dev_name, data, udf_fill_super, mnt);
 120 }
 121
 122 static struct file_system_type udf_fstype = {
 123         .owner          = THIS_MODULE,
 124         .name           = "udf",
 125         .get_sb         = udf_get_sb,
 126         .kill_sb        = kill_block_super,
 127         .fs_flags       = FS_REQUIRES_DEV,
 128 };
 129
 130 static struct kmem_cache *udf_inode_cachep;
 131
 132 static struct inode *udf_alloc_inode(struct super_block *sb)
 133 {
 134         struct udf_inode_info *ei;
 135         ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
 136         if (!ei)
 137                 return NULL;
 138
 139         ei->i_unique = 0;
 140         ei->i_lenExtents = 0;
 141         ei->i_next_alloc_block = 0;
 142         ei->i_next_alloc_goal = 0;
 143         ei->i_strat4096 = 0;
 144
 145         return &ei->vfs_inode;
 146 }
 147
 148 static void udf_destroy_inode(struct inode *inode)
 149 {
 150         kmem_cache_free(udf_inode_cachep, UDF_I(inode));
 151 }
 152
 153 static void init_once(struct kmem_cache *cachep, void *foo)
 154 {
 155         struct udf_inode_info *ei = (struct udf_inode_info *)foo;
 156
 157         ei->i_ext.i_data = NULL;
 158         inode_init_once(&ei->vfs_inode);
 159 }
 160
 161 static int init_inodecache(void)
 162 {
 163         udf_inode_cachep = kmem_cache_create("udf_inode_cache",
 164                                              sizeof(struct udf_inode_info),
 165                                              0, (SLAB_RECLAIM_ACCOUNT |
 166                                                  SLAB_MEM_SPREAD),
 167                                              init_once);
 168         if (!udf_inode_cachep)
 169                 return -ENOMEM;
 170         return 0;
 171 }
 172
 173 static void destroy_inodecache(void)
 174 {
 175         kmem_cache_destroy(udf_inode_cachep);
 176 }
 177
 178 /* Superblock operations */
 179 static const struct super_operations udf_sb_ops = {
 180         .alloc_inode    = udf_alloc_inode,
 181         .destroy_inode  = udf_destroy_inode,
 182         .write_inode    = udf_write_inode,
 183         .delete_inode   = udf_delete_inode,
 184         .clear_inode    = udf_clear_inode,
 185         .put_super      = udf_put_super,
 186         .write_super    = udf_write_super,
 187         .statfs         = udf_statfs,
 188         .remount_fs     = udf_remount_fs,
 189         .show_options   = udf_show_options,
 190 };
 191
 192 struct udf_options {
 193         unsigned char novrs;
 194         unsigned int blocksize;
 195         unsigned int session;
 196         unsigned int lastblock;
 197         unsigned int anchor;
 198         unsigned int volume;
 199         unsigned short partition;
 200         unsigned int fileset;
 201         unsigned int rootdir;
 202         unsigned int flags;
 203         mode_t umask;
 204         gid_t gid;
 205         uid_t uid;
 206         struct nls_table *nls_map;
 207 };
 208
 209 static int __init init_udf_fs(void)
 210 {
 211         int err;
 212
 213         err = init_inodecache();
 214         if (err)
 215                 goto out1;
 216         err = register_filesystem(&udf_fstype);
 217         if (err)
 218                 goto out;
 219
 220         return 0;
 221
 222 out:
 223         destroy_inodecache();
 224
 225 out1:
 226         return err;
 227 }
 228
 229 static void __exit exit_udf_fs(void)
 230 {
 231         unregister_filesystem(&udf_fstype);
 232         destroy_inodecache();
 233 }
 234
 235 module_init(init_udf_fs)
 236 module_exit(exit_udf_fs)
 237
 238 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
 239 {
 240         struct udf_sb_info *sbi = UDF_SB(sb);
 241
 242         sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map),
 243                                   GFP_KERNEL);
 244         if (!sbi->s_partmaps) {
 245                 udf_error(sb, __FUNCTION__,
 246                           "Unable to allocate space for %d partition maps",
 247                           count);
 248                 sbi->s_partitions = 0;
 249                 return -ENOMEM;
 250         }
 251
 252         sbi->s_partitions = count;
 253         return 0;
 254 }
 255
 256 static int udf_show_options(struct seq_file *seq, struct vfsmount *mnt)
 257 {
 258         struct super_block *sb = mnt->mnt_sb;
 259         struct udf_sb_info *sbi = UDF_SB(sb);
 260
 261         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
 262                 seq_puts(seq, ",nostrict");
 263         if (sb->s_blocksize != UDF_DEFAULT_BLOCKSIZE)
 264                 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
 265         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
 266                 seq_puts(seq, ",unhide");
 267         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
 268                 seq_puts(seq, ",undelete");
 269         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
 270                 seq_puts(seq, ",noadinicb");
 271         if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
 272                 seq_puts(seq, ",shortad");
 273         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
 274                 seq_puts(seq, ",uid=forget");
 275         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_IGNORE))
 276                 seq_puts(seq, ",uid=ignore");
 277         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
 278                 seq_puts(seq, ",gid=forget");
 279         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE))
 280                 seq_puts(seq, ",gid=ignore");
 281         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
 282                 seq_printf(seq, ",uid=%u", sbi->s_uid);
 283         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
 284                 seq_printf(seq, ",gid=%u", sbi->s_gid);
 285         if (sbi->s_umask != 0)
 286                 seq_printf(seq, ",umask=%o", sbi->s_umask);
 287         if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
 288                 seq_printf(seq, ",session=%u", sbi->s_session);
 289         if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
 290                 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
 291         /*
 292          * s_anchor[2] could be zeroed out in case there is no anchor
 293          * in the specified block, but then the "anchor=N" option
 294          * originally given by the user wasn't effective, so it's OK
 295          * if we don't show it.
 296          */
 297         if (sbi->s_anchor[2] != 0)
 298                 seq_printf(seq, ",anchor=%u", sbi->s_anchor[2]);
 299         /*
 300          * volume, partition, fileset and rootdir seem to be ignored
 301          * currently
 302          */
 303         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
 304                 seq_puts(seq, ",utf8");
 305         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
 306                 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
 307
 308         return 0;
 309 }
 310
 311 /*
 312  * udf_parse_options
 313  *
 314  * PURPOSE
 315  *      Parse mount options.
 316  *
 317  * DESCRIPTION
 318  *      The following mount options are supported:
 319  *
 320  *      gid=            Set the default group.
 321  *      umask=          Set the default umask.
 322  *      uid=            Set the default user.
 323  *      bs=             Set the block size.
 324  *      unhide          Show otherwise hidden files.
 325  *      undelete        Show deleted files in lists.
 326  *      adinicb         Embed data in the inode (default)
 327  *      noadinicb       Don't embed data in the inode
 328  *      shortad         Use short ad's
 329  *      longad          Use long ad's (default)
 330  *      nostrict        Unset strict conformance
 331  *      iocharset=      Set the NLS character set
 332  *
 333  *      The remaining are for debugging and disaster recovery:
 334  *
 335  *      novrs           Skip volume sequence recognition
 336  *
 337  *      The following expect a offset from 0.
 338  *
 339  *      session=        Set the CDROM session (default= last session)
 340  *      anchor=         Override standard anchor location. (default= 256)
 341  *      volume=         Override the VolumeDesc location. (unused)
 342  *      partition=      Override the PartitionDesc location. (unused)
 343  *      lastblock=      Set the last block of the filesystem/
 344  *
 345  *      The following expect a offset from the partition root.
 346  *
 347  *      fileset=        Override the fileset block location. (unused)
 348  *      rootdir=        Override the root directory location. (unused)
 349  *              WARNING: overriding the rootdir to a non-directory may
 350  *              yield highly unpredictable results.
 351  *
 352  * PRE-CONDITIONS
 353  *      options         Pointer to mount options string.
 354  *      uopts           Pointer to mount options variable.
 355  *
 356  * POST-CONDITIONS
 357  *      <return>        1       Mount options parsed okay.
 358  *      <return>        0       Error parsing mount options.
 359  *
 360  * HISTORY
 361  *      July 1, 1997 - Andrew E. Mileski
 362  *      Written, tested, and released.
 363  */
 364
 365 enum {
 366         Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
 367         Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
 368         Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
 369         Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
 370         Opt_rootdir, Opt_utf8, Opt_iocharset,
 371         Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore
 372 };
 373
 374 static match_table_t tokens = {
 375         {Opt_novrs,     "novrs"},
 376         {Opt_nostrict,  "nostrict"},
 377         {Opt_bs,        "bs=%u"},
 378         {Opt_unhide,    "unhide"},
 379         {Opt_undelete,  "undelete"},
 380         {Opt_noadinicb, "noadinicb"},
 381         {Opt_adinicb,   "adinicb"},
 382         {Opt_shortad,   "shortad"},
 383         {Opt_longad,    "longad"},
 384         {Opt_uforget,   "uid=forget"},
 385         {Opt_uignore,   "uid=ignore"},
 386         {Opt_gforget,   "gid=forget"},
 387         {Opt_gignore,   "gid=ignore"},
 388         {Opt_gid,       "gid=%u"},
 389         {Opt_uid,       "uid=%u"},
 390         {Opt_umask,     "umask=%o"},
 391         {Opt_session,   "session=%u"},
 392         {Opt_lastblock, "lastblock=%u"},
 393         {Opt_anchor,    "anchor=%u"},
 394         {Opt_volume,    "volume=%u"},
 395         {Opt_partition, "partition=%u"},
 396         {Opt_fileset,   "fileset=%u"},
 397         {Opt_rootdir,   "rootdir=%u"},
 398         {Opt_utf8,      "utf8"},
 399         {Opt_iocharset, "iocharset=%s"},
 400         {Opt_err,       NULL}
 401 };
 402
 403 static int udf_parse_options(char *options, struct udf_options *uopt,
 404                              bool remount)
 405 {
 406         char *p;
 407         int option;
 408
 409         uopt->novrs = 0;
 410         uopt->blocksize = UDF_DEFAULT_BLOCKSIZE;
 411         uopt->partition = 0xFFFF;
 412         uopt->session = 0xFFFFFFFF;
 413         uopt->lastblock = 0;
 414         uopt->anchor = 0;
 415         uopt->volume = 0xFFFFFFFF;
 416         uopt->rootdir = 0xFFFFFFFF;
 417         uopt->fileset = 0xFFFFFFFF;
 418         uopt->nls_map = NULL;
 419
 420         if (!options)
 421                 return 1;
 422
 423         while ((p = strsep(&options, ",")) != NULL) {
 424                 substring_t args[MAX_OPT_ARGS];
 425                 int token;
 426                 if (!*p)
 427                         continue;
 428
 429                 token = match_token(p, tokens, args);
 430                 switch (token) {
 431                 case Opt_novrs:
 432                         uopt->novrs = 1;
 433                 case Opt_bs:
 434                         if (match_int(&args[0], &option))
 435                                 return 0;
 436                         uopt->blocksize = option;
 437                         break;
 438                 case Opt_unhide:
 439                         uopt->flags |= (1 << UDF_FLAG_UNHIDE);
 440                         break;
 441                 case Opt_undelete:
 442                         uopt->flags |= (1 << UDF_FLAG_UNDELETE);
 443                         break;
 444                 case Opt_noadinicb:
 445                         uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
 446                         break;
 447                 case Opt_adinicb:
 448                         uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
 449                         break;
 450                 case Opt_shortad:
 451                         uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
 452                         break;
 453                 case Opt_longad:
 454                         uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
 455                         break;
 456                 case Opt_gid:
 457                         if (match_int(args, &option))
 458                                 return 0;
 459                         uopt->gid = option;
 460                         uopt->flags |= (1 << UDF_FLAG_GID_SET);
 461                         break;
 462                 case Opt_uid:
 463                         if (match_int(args, &option))
 464                                 return 0;
 465                         uopt->uid = option;
 466                         uopt->flags |= (1 << UDF_FLAG_UID_SET);
 467                         break;
 468                 case Opt_umask:
 469                         if (match_octal(args, &option))
 470                                 return 0;
 471                         uopt->umask = option;
 472                         break;
 473                 case Opt_nostrict:
 474                         uopt->flags &= ~(1 << UDF_FLAG_STRICT);
 475                         break;
 476                 case Opt_session:
 477                         if (match_int(args, &option))
 478                                 return 0;
 479                         uopt->session = option;
 480                         if (!remount)
 481                                 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
 482                         break;
 483                 case Opt_lastblock:
 484                         if (match_int(args, &option))
 485                                 return 0;
 486                         uopt->lastblock = option;
 487                         if (!remount)
 488                                 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
 489                         break;
 490                 case Opt_anchor:
 491                         if (match_int(args, &option))
 492                                 return 0;
 493                         uopt->anchor = option;
 494                         break;
 495                 case Opt_volume:
 496                         if (match_int(args, &option))
 497                                 return 0;
 498                         uopt->volume = option;
 499                         break;
 500                 case Opt_partition:
 501                         if (match_int(args, &option))
 502                                 return 0;
 503                         uopt->partition = option;
 504                         break;
 505                 case Opt_fileset:
 506                         if (match_int(args, &option))
 507                                 return 0;
 508                         uopt->fileset = option;
 509                         break;
 510                 case Opt_rootdir:
 511                         if (match_int(args, &option))
 512                                 return 0;
 513                         uopt->rootdir = option;
 514                         break;
 515                 case Opt_utf8:
 516                         uopt->flags |= (1 << UDF_FLAG_UTF8);
 517                         break;
 518 #ifdef CONFIG_UDF_NLS
 519                 case Opt_iocharset:
 520                         uopt->nls_map = load_nls(args[0].from);
 521                         uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
 522                         break;
 523 #endif
 524                 case Opt_uignore:
 525                         uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
 526                         break;
 527                 case Opt_uforget:
 528                         uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
 529                         break;
 530                 case Opt_gignore:
 531                         uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
 532                         break;
 533                 case Opt_gforget:
 534                         uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
 535                         break;
 536                 default:
 537                         printk(KERN_ERR "udf: bad mount option \"%s\" "
 538                                "or missing value\n", p);
 539                         return 0;
 540                 }
 541         }
 542         return 1;
 543 }
 544
 545 static void udf_write_super(struct super_block *sb)
 546 {
 547         lock_kernel();
 548
 549         if (!(sb->s_flags & MS_RDONLY))
 550                 udf_open_lvid(sb);
 551         sb->s_dirt = 0;
 552
 553         unlock_kernel();
 554 }
 555
 556 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
 557 {
 558         struct udf_options uopt;
 559         struct udf_sb_info *sbi = UDF_SB(sb);
 560
 561         uopt.flags = sbi->s_flags;
 562         uopt.uid   = sbi->s_uid;
 563         uopt.gid   = sbi->s_gid;
 564         uopt.umask = sbi->s_umask;
 565
 566         if (!udf_parse_options(options, &uopt, true))
 567                 return -EINVAL;
 568
 569         sbi->s_flags = uopt.flags;
 570         sbi->s_uid   = uopt.uid;
 571         sbi->s_gid   = uopt.gid;
 572         sbi->s_umask = uopt.umask;
 573
 574         if (sbi->s_lvid_bh) {
 575                 int write_rev = le16_to_cpu(udf_sb_lvidiu(sbi)->minUDFWriteRev);
 576                 if (write_rev > UDF_MAX_WRITE_VERSION)
 577                         *flags |= MS_RDONLY;
 578         }
 579
 580         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 581                 return 0;
 582         if (*flags & MS_RDONLY)
 583                 udf_close_lvid(sb);
 584         else
 585                 udf_open_lvid(sb);
 586
 587         return 0;
 588 }
 589
 590 /*
 591  * udf_set_blocksize
 592  *
 593  * PURPOSE
 594  *      Set the block size to be used in all transfers.
 595  *
 596  * DESCRIPTION
 597  *      To allow room for a DMA transfer, it is best to guess big when unsure.
 598  *      This routine picks 2048 bytes as the blocksize when guessing. This
 599  *      should be adequate until devices with larger block sizes become common.
 600  *
 601  *      Note that the Linux kernel can currently only deal with blocksizes of
 602  *      512, 1024, 2048, 4096, and 8192 bytes.
 603  *
 604  * PRE-CONDITIONS
 605  *      sb                      Pointer to _locked_ superblock.
 606  *
 607  * POST-CONDITIONS
 608  *      sb->s_blocksize         Blocksize.
 609  *      sb->s_blocksize_bits    log2 of blocksize.
 610  *      <return>        0       Blocksize is valid.
 611  *      <return>        1       Blocksize is invalid.
 612  *
 613  * HISTORY
 614  *      July 1, 1997 - Andrew E. Mileski
 615  *      Written, tested, and released.
 616  */
 617 static int udf_set_blocksize(struct super_block *sb, int bsize)
 618 {
 619         if (!sb_min_blocksize(sb, bsize)) {
 620                 udf_debug("Bad block size (%d)\n", bsize);
 621                 printk(KERN_ERR "udf: bad block size (%d)\n", bsize);
 622                 return 0;
 623         }
 624
 625         return sb->s_blocksize;
 626 }
 627
 628 static int udf_vrs(struct super_block *sb, int silent)
 629 {
 630         struct volStructDesc *vsd = NULL;
 631         int sector = 32768;
 632         int sectorsize;
 633         struct buffer_head *bh = NULL;
 634         int iso9660 = 0;
 635         int nsr02 = 0;
 636         int nsr03 = 0;
 637         struct udf_sb_info *sbi;
 638
 639         /* Block size must be a multiple of 512 */
 640         if (sb->s_blocksize & 511)
 641                 return 0;
 642         sbi = UDF_SB(sb);
 643
 644         if (sb->s_blocksize < sizeof(struct volStructDesc))
 645                 sectorsize = sizeof(struct volStructDesc);
 646         else
 647                 sectorsize = sb->s_blocksize;
 648
 649         sector += (sbi->s_session << sb->s_blocksize_bits);
 650
 651         udf_debug("Starting at sector %u (%ld byte sectors)\n",
 652                   (sector >> sb->s_blocksize_bits), sb->s_blocksize);
 653         /* Process the sequence (if applicable) */
 654         for (; !nsr02 && !nsr03; sector += sectorsize) {
 655                 /* Read a block */
 656                 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
 657                 if (!bh)
 658                         break;
 659
 660                 /* Look for ISO  descriptors */
 661                 vsd = (struct volStructDesc *)(bh->b_data +
 662                                               (sector & (sb->s_blocksize - 1)));
 663
 664                 if (vsd->stdIdent[0] == 0) {
 665                         brelse(bh);
 666                         break;
 667                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
 668                                     VSD_STD_ID_LEN)) {
 669                         iso9660 = sector;
 670                         switch (vsd->structType) {
 671                         case 0:
 672                                 udf_debug("ISO9660 Boot Record found\n");
 673                                 break;
 674                         case 1:
 675                                 udf_debug("ISO9660 Primary Volume Descriptor "
 676                                           "found\n");
 677                                 break;
 678                         case 2:
 679                                 udf_debug("ISO9660 Supplementary Volume "
 680                                           "Descriptor found\n");
 681                                 break;
 682                         case 3:
 683                                 udf_debug("ISO9660 Volume Partition Descriptor "
 684                                           "found\n");
 685                                 break;
 686                         case 255:
 687                                 udf_debug("ISO9660 Volume Descriptor Set "
 688                                           "Terminator found\n");
 689                                 break;
 690                         default:
 691                                 udf_debug("ISO9660 VRS (%u) found\n",
 692                                           vsd->structType);
 693                                 break;
 694                         }
 695                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
 696                                     VSD_STD_ID_LEN))
 697                         ; /* nothing */
 698                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
 699                                     VSD_STD_ID_LEN)) {
 700                         brelse(bh);
 701                         break;
 702                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
 703                                     VSD_STD_ID_LEN))
 704                         nsr02 = sector;
 705                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
 706                                     VSD_STD_ID_LEN))
 707                         nsr03 = sector;
 708                 brelse(bh);
 709         }
 710
 711         if (nsr03)
 712                 return nsr03;
 713         else if (nsr02)
 714                 return nsr02;
 715         else if (sector - (sbi->s_session << sb->s_blocksize_bits) == 32768)
 716                 return -1;
 717         else
 718                 return 0;
 719 }
 720
 721 /*
 722  * udf_find_anchor
 723  *
 724  * PURPOSE
 725  *      Find an anchor volume descriptor.
 726  *
 727  * PRE-CONDITIONS
 728  *      sb                      Pointer to _locked_ superblock.
 729  *      lastblock               Last block on media.
 730  *
 731  * POST-CONDITIONS
 732  *      <return>                1 if not found, 0 if ok
 733  *
 734  * HISTORY
 735  *      July 1, 1997 - Andrew E. Mileski
 736  *      Written, tested, and released.
 737  */
 738 static void udf_find_anchor(struct super_block *sb)
 739 {
 740         int lastblock;
 741         struct buffer_head *bh = NULL;
 742         uint16_t ident;
 743         uint32_t location;
 744         int i;
 745         struct udf_sb_info *sbi;
 746
 747         sbi = UDF_SB(sb);
 748         lastblock = sbi->s_last_block;
 749
 750         if (lastblock) {
 751                 int varlastblock = udf_variable_to_fixed(lastblock);
 752                 int last[] =  { lastblock, lastblock - 2,
 753                                 lastblock - 150, lastblock - 152,
 754                                 varlastblock, varlastblock - 2,
 755                                 varlastblock - 150, varlastblock - 152 };
 756
 757                 lastblock = 0;
 758
 759                 /* Search for an anchor volume descriptor pointer */
 760
 761                 /*  according to spec, anchor is in either:
 762                  *     block 256
 763                  *     lastblock-256
 764                  *     lastblock
 765                  *  however, if the disc isn't closed, it could be 512 */
 766
 767                 for (i = 0; !lastblock && i < ARRAY_SIZE(last); i++) {
 768                         ident = location = 0;
 769                         if (last[i] >= 0) {
 770                                 bh = sb_bread(sb, last[i]);
 771                                 if (bh) {
 772                                         tag *t = (tag *)bh->b_data;
 773                                         ident = le16_to_cpu(t->tagIdent);
 774                                         location = le32_to_cpu(t->tagLocation);
 775                                         brelse(bh);
 776                                 }
 777                         }
 778
 779                         if (ident == TAG_IDENT_AVDP) {
 780                                 if (location == last[i] - sbi->s_session) {
 781                                         lastblock = last[i] - sbi->s_session;
 782                                         sbi->s_anchor[0] = lastblock;
 783                                         sbi->s_anchor[1] = lastblock - 256;
 784                                 } else if (location ==
 785                                                 udf_variable_to_fixed(last[i]) -
 786                                                         sbi->s_session) {
 787                                         UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
 788                                         lastblock =
 789                                                 udf_variable_to_fixed(last[i]) -
 790                                                         sbi->s_session;
 791                                         sbi->s_anchor[0] = lastblock;
 792                                         sbi->s_anchor[1] = lastblock - 256 -
 793                                                                 sbi->s_session;
 794                                 } else {
 795                                         udf_debug("Anchor found at block %d, "
 796                                                   "location mismatch %d.\n",
 797                                                   last[i], location);
 798                                 }
 799                         } else if (ident == TAG_IDENT_FE ||
 800                                         ident == TAG_IDENT_EFE) {
 801                                 lastblock = last[i];
 802                                 sbi->s_anchor[3] = 512;
 803                         } else {
 804                                 ident = location = 0;
 805                                 if (last[i] >= 256) {
 806                                         bh = sb_bread(sb, last[i] - 256);
 807                                         if (bh) {
 808                                                 tag *t = (tag *)bh->b_data;
 809                                                 ident = le16_to_cpu(
 810                                                                 t->tagIdent);
 811                                                 location = le32_to_cpu(
 812                                                                 t->tagLocation);
 813                                                 brelse(bh);
 814                                         }
 815                                 }
 816
 817                                 if (ident == TAG_IDENT_AVDP &&
 818                                     location == last[i] - 256 -
 819                                                 sbi->s_session) {
 820                                         lastblock = last[i];
 821                                         sbi->s_anchor[1] = last[i] - 256;
 822                                 } else {
 823                                         ident = location = 0;
 824                                         if (last[i] >= 312 + sbi->s_session) {
 825                                                 bh = sb_bread(sb,
 826                                                                 last[i] - 312 -
 827                                                                 sbi->s_session);
 828                                                 if (bh) {
 829                                                         tag *t = (tag *)
 830                                                                  bh->b_data;
 831                                                         ident = le16_to_cpu(
 832                                                                 t->tagIdent);
 833                                                         location = le32_to_cpu(
 834                                                                 t->tagLocation);
 835                                                         brelse(bh);
 836                                                 }
 837                                         }
 838
 839                                         if (ident == TAG_IDENT_AVDP &&
 840                                             location == udf_variable_to_fixed(last[i]) - 256) {
 841                                                 UDF_SET_FLAG(sb,
 842                                                              UDF_FLAG_VARCONV);
 843                                                 lastblock = udf_variable_to_fixed(last[i]);
 844                                                 sbi->s_anchor[1] = lastblock - 256;
 845                                         }
 846                                 }
 847                         }
 848                 }
 849         }
 850
 851         if (!lastblock) {
 852                 /* We haven't found the lastblock. check 312 */
 853                 bh = sb_bread(sb, 312 + sbi->s_session);
 854                 if (bh) {
 855                         tag *t = (tag *)bh->b_data;
 856                         ident = le16_to_cpu(t->tagIdent);
 857                         location = le32_to_cpu(t->tagLocation);
 858                         brelse(bh);
 859
 860                         if (ident == TAG_IDENT_AVDP && location == 256)
 861                                 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
 862                 }
 863         }
 864
 865         for (i = 0; i < ARRAY_SIZE(sbi->s_anchor); i++) {
 866                 if (sbi->s_anchor[i]) {
 867                         bh = udf_read_tagged(sb, sbi->s_anchor[i],
 868                                              sbi->s_anchor[i], &ident);
 869                         if (!bh)
 870                                 sbi->s_anchor[i] = 0;
 871                         else {
 872                                 brelse(bh);
 873                                 if ((ident != TAG_IDENT_AVDP) &&
 874                                     (i || (ident != TAG_IDENT_FE &&
 875                                            ident != TAG_IDENT_EFE)))
 876                                         sbi->s_anchor[i] = 0;
 877                         }
 878                 }
 879         }
 880
 881         sbi->s_last_block = lastblock;
 882 }
 883
 884 static int udf_find_fileset(struct super_block *sb,
 885                             kernel_lb_addr *fileset,
 886                             kernel_lb_addr *root)
 887 {
 888         struct buffer_head *bh = NULL;
 889         long lastblock;
 890         uint16_t ident;
 891         struct udf_sb_info *sbi;
 892
 893         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
 894             fileset->partitionReferenceNum != 0xFFFF) {
 895                 bh = udf_read_ptagged(sb, *fileset, 0, &ident);
 896
 897                 if (!bh) {
 898                         return 1;
 899                 } else if (ident != TAG_IDENT_FSD) {
 900                         brelse(bh);
 901                         return 1;
 902                 }
 903
 904         }
 905
 906         sbi = UDF_SB(sb);
 907         if (!bh) {
 908                 /* Search backwards through the partitions */
 909                 kernel_lb_addr newfileset;
 910
 911 /* --> cvg: FIXME - is it reasonable? */
 912                 return 1;
 913
 914                 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
 915                      (newfileset.partitionReferenceNum != 0xFFFF &&
 916                       fileset->logicalBlockNum == 0xFFFFFFFF &&
 917                       fileset->partitionReferenceNum == 0xFFFF);
 918                      newfileset.partitionReferenceNum--) {
 919                         lastblock = sbi->s_partmaps
 920                                         [newfileset.partitionReferenceNum]
 921                                                 .s_partition_len;
 922                         newfileset.logicalBlockNum = 0;
 923
 924                         do {
 925                                 bh = udf_read_ptagged(sb, newfileset, 0,
 926                                                       &ident);
 927                                 if (!bh) {
 928                                         newfileset.logicalBlockNum++;
 929                                         continue;
 930                                 }
 931
 932                                 switch (ident) {
 933                                 case TAG_IDENT_SBD:
 934                                 {
 935                                         struct spaceBitmapDesc *sp;
 936                                         sp = (struct spaceBitmapDesc *)
 937                                                                 bh->b_data;
 938                                         newfileset.logicalBlockNum += 1 +
 939                                                 ((le32_to_cpu(sp->numOfBytes) +
 940                                                   sizeof(struct spaceBitmapDesc)
 941                                                   - 1) >> sb->s_blocksize_bits);
 942                                         brelse(bh);
 943                                         break;
 944                                 }
 945                                 case TAG_IDENT_FSD:
 946                                         *fileset = newfileset;
 947                                         break;
 948                                 default:
 949                                         newfileset.logicalBlockNum++;
 950                                         brelse(bh);
 951                                         bh = NULL;
 952                                         break;
 953                                 }
 954                         } while (newfileset.logicalBlockNum < lastblock &&
 955                                  fileset->logicalBlockNum == 0xFFFFFFFF &&
 956                                  fileset->partitionReferenceNum == 0xFFFF);
 957                 }
 958         }
 959
 960         if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
 961              fileset->partitionReferenceNum != 0xFFFF) && bh) {
 962                 udf_debug("Fileset at block=%d, partition=%d\n",
 963                           fileset->logicalBlockNum,
 964                           fileset->partitionReferenceNum);
 965
 966                 sbi->s_partition = fileset->partitionReferenceNum;
 967                 udf_load_fileset(sb, bh, root);
 968                 brelse(bh);
 969                 return 0;
 970         }
 971         return 1;
 972 }
 973
 974 static void udf_load_pvoldesc(struct super_block *sb, struct buffer_head *bh)
 975 {
 976         struct primaryVolDesc *pvoldesc;
 977         time_t recording;
 978         long recording_usec;
 979         struct ustr instr;
 980         struct ustr outstr;
 981
 982         pvoldesc = (struct primaryVolDesc *)bh->b_data;
 983
 984         if (udf_stamp_to_time(&recording, &recording_usec,
 985                               lets_to_cpu(pvoldesc->recordingDateAndTime))) {
 986                 kernel_timestamp ts;
 987                 ts = lets_to_cpu(pvoldesc->recordingDateAndTime);
 988                 udf_debug("recording time %ld/%ld, %04u/%02u/%02u"
 989                           " %02u:%02u (%x)\n",
 990                           recording, recording_usec,
 991                           ts.year, ts.month, ts.day, ts.hour,
 992                           ts.minute, ts.typeAndTimezone);
 993                 UDF_SB(sb)->s_record_time.tv_sec = recording;
 994                 UDF_SB(sb)->s_record_time.tv_nsec = recording_usec * 1000;
 995         }
 996
 997         if (!udf_build_ustr(&instr, pvoldesc->volIdent, 32))
 998                 if (udf_CS0toUTF8(&outstr, &instr)) {
 999                         strncpy(UDF_SB(sb)->s_volume_ident, outstr.u_name,
1000                                 outstr.u_len > 31 ? 31 : outstr.u_len);
1001                         udf_debug("volIdent[] = '%s'\n",
1002                                         UDF_SB(sb)->s_volume_ident);
1003                 }
1004
1005         if (!udf_build_ustr(&instr, pvoldesc->volSetIdent, 128))
1006                 if (udf_CS0toUTF8(&outstr, &instr))
1007                         udf_debug("volSetIdent[] = '%s'\n", outstr.u_name);
1008 }
1009
1010 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
1011                              kernel_lb_addr *root)
1012 {
1013         struct fileSetDesc *fset;
1014
1015         fset = (struct fileSetDesc *)bh->b_data;
1016
1017         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
1018
1019         UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
1020
1021         udf_debug("Rootdir at block=%d, partition=%d\n",
1022                   root->logicalBlockNum, root->partitionReferenceNum);
1023 }
1024
1025 int udf_compute_nr_groups(struct super_block *sb, u32 partition)
1026 {
1027         struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
1028         return (map->s_partition_len +
1029                 (sizeof(struct spaceBitmapDesc) << 3) +
1030                 (sb->s_blocksize * 8) - 1) /
1031                 (sb->s_blocksize * 8);
1032 }
1033
1034 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
1035 {
1036         struct udf_bitmap *bitmap;
1037         int nr_groups;
1038         int size;
1039
1040         nr_groups = udf_compute_nr_groups(sb, index);
1041         size = sizeof(struct udf_bitmap) +
1042                 (sizeof(struct buffer_head *) * nr_groups);
1043
1044         if (size <= PAGE_SIZE)
1045                 bitmap = kmalloc(size, GFP_KERNEL);
1046         else
1047                 bitmap = vmalloc(size); /* TODO: get rid of vmalloc */
1048
1049         if (bitmap == NULL) {
1050                 udf_error(sb, __FUNCTION__,
1051                           "Unable to allocate space for bitmap "
1052                           "and %d buffer_head pointers", nr_groups);
1053                 return NULL;
1054         }
1055
1056         memset(bitmap, 0x00, size);
1057         bitmap->s_block_bitmap = (struct buffer_head **)(bitmap + 1);
1058         bitmap->s_nr_groups = nr_groups;
1059         return bitmap;
1060 }
1061
1062 static int udf_load_partdesc(struct super_block *sb, struct buffer_head *bh)
1063 {
1064         struct partitionDesc *p;
1065         int i;
1066         struct udf_part_map *map;
1067         struct udf_sb_info *sbi;
1068
1069         p = (struct partitionDesc *)bh->b_data;
1070         sbi = UDF_SB(sb);
1071
1072         for (i = 0; i < sbi->s_partitions; i++) {
1073                 map = &sbi->s_partmaps[i];
1074                 udf_debug("Searching map: (%d == %d)\n",
1075                           map->s_partition_num,
1076                           le16_to_cpu(p->partitionNumber));
1077                 if (map->s_partition_num ==
1078                                 le16_to_cpu(p->partitionNumber)) {
1079                         map->s_partition_len =
1080                                 le32_to_cpu(p->partitionLength); /* blocks */
1081                         map->s_partition_root =
1082                                 le32_to_cpu(p->partitionStartingLocation);
1083                         if (p->accessType ==
1084                                         cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
1085                                 map->s_partition_flags |=
1086                                                 UDF_PART_FLAG_READ_ONLY;
1087                         if (p->accessType ==
1088                                         cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
1089                                 map->s_partition_flags |=
1090                                                 UDF_PART_FLAG_WRITE_ONCE;
1091                         if (p->accessType ==
1092                                         cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
1093                                 map->s_partition_flags |=
1094                                                 UDF_PART_FLAG_REWRITABLE;
1095                         if (p->accessType ==
1096                                     cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
1097                                 map->s_partition_flags |=
1098                                                 UDF_PART_FLAG_OVERWRITABLE;
1099
1100                         if (!strcmp(p->partitionContents.ident,
1101                                     PD_PARTITION_CONTENTS_NSR02) ||
1102                             !strcmp(p->partitionContents.ident,
1103                                     PD_PARTITION_CONTENTS_NSR03)) {
1104                                 struct partitionHeaderDesc *phd;
1105
1106                                 phd = (struct partitionHeaderDesc *)
1107                                                 (p->partitionContentsUse);
1108                                 if (phd->unallocSpaceTable.extLength) {
1109                                         kernel_lb_addr loc = {
1110                                                 .logicalBlockNum = le32_to_cpu(phd->unallocSpaceTable.extPosition),
1111                                                 .partitionReferenceNum = i,
1112                                         };
1113
1114                                         map->s_uspace.s_table =
1115                                                 udf_iget(sb, loc);
1116                                         if (!map->s_uspace.s_table) {
1117                                                 udf_debug("cannot load unallocSpaceTable (part %d)\n", i);
1118                                                 return 1;
1119                                         }
1120                                         map->s_partition_flags |=
1121                                                 UDF_PART_FLAG_UNALLOC_TABLE;
1122                                         udf_debug("unallocSpaceTable (part %d) @ %ld\n",
1123                                                   i, map->s_uspace.s_table->i_ino);
1124                                 }
1125                                 if (phd->unallocSpaceBitmap.extLength) {
1126                                         struct udf_bitmap *bitmap =
1127                                                 udf_sb_alloc_bitmap(sb, i);
1128                                         map->s_uspace.s_bitmap = bitmap;
1129                                         if (bitmap != NULL) {
1130                                                 bitmap->s_extLength =
1131                                                         le32_to_cpu(phd->unallocSpaceBitmap.extLength);
1132                                                 bitmap->s_extPosition =
1133                                                         le32_to_cpu(phd->unallocSpaceBitmap.extPosition);
1134                                                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1135                                                 udf_debug("unallocSpaceBitmap (part %d) @ %d\n",
1136                                                           i, bitmap->s_extPosition);
1137                                         }
1138                                 }
1139                                 if (phd->partitionIntegrityTable.extLength)
1140                                         udf_debug("partitionIntegrityTable (part %d)\n", i);
1141                                 if (phd->freedSpaceTable.extLength) {
1142                                         kernel_lb_addr loc = {
1143                                                 .logicalBlockNum = le32_to_cpu(phd->freedSpaceTable.extPosition),
1144                                                 .partitionReferenceNum = i,
1145                                         };
1146
1147                                         map->s_fspace.s_table =
1148                                                 udf_iget(sb, loc);
1149                                         if (!map->s_fspace.s_table) {
1150                                                 udf_debug("cannot load freedSpaceTable (part %d)\n", i);
1151                                                 return 1;
1152                                         }
1153                                         map->s_partition_flags |=
1154                                                 UDF_PART_FLAG_FREED_TABLE;
1155                                         udf_debug("freedSpaceTable (part %d) @ %ld\n",
1156                                                   i, map->s_fspace.s_table->i_ino);
1157                                 }
1158                                 if (phd->freedSpaceBitmap.extLength) {
1159                                         struct udf_bitmap *bitmap =
1160                                                 udf_sb_alloc_bitmap(sb, i);
1161                                         map->s_fspace.s_bitmap = bitmap;
1162                                         if (bitmap != NULL) {
1163                                                 bitmap->s_extLength =
1164                                                         le32_to_cpu(phd->freedSpaceBitmap.extLength);
1165                                                 bitmap->s_extPosition =
1166                                                         le32_to_cpu(phd->freedSpaceBitmap.extPosition);
1167                                                 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1168                                                 udf_debug("freedSpaceBitmap (part %d) @ %d\n",
1169                                                           i, bitmap->s_extPosition);
1170                                         }
1171                                 }
1172                         }
1173                         break;
1174                 }
1175         }
1176         if (i == sbi->s_partitions)
1177                 udf_debug("Partition (%d) not found in partition map\n",
1178                           le16_to_cpu(p->partitionNumber));
1179         else
1180                 udf_debug("Partition (%d:%d type %x) starts at physical %d, "
1181                           "block length %d\n",
1182                           le16_to_cpu(p->partitionNumber), i,
1183                           map->s_partition_type,
1184                           map->s_partition_root,
1185                           map->s_partition_len);
1186         return 0;
1187 }
1188
1189 static int udf_load_logicalvol(struct super_block *sb, struct buffer_head *bh,
1190                                kernel_lb_addr *fileset)
1191 {
1192         struct logicalVolDesc *lvd;
1193         int i, j, offset;
1194         uint8_t type;
1195         struct udf_sb_info *sbi = UDF_SB(sb);
1196         struct genericPartitionMap *gpm;
1197
1198         lvd = (struct logicalVolDesc *)bh->b_data;
1199
1200         i = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1201         if (i != 0)
1202                 return i;
1203
1204         for (i = 0, offset = 0;
1205              i < sbi->s_partitions && offset < le32_to_cpu(lvd->mapTableLength);
1206              i++, offset += gpm->partitionMapLength) {
1207                 struct udf_part_map *map = &sbi->s_partmaps[i];
1208                 gpm = (struct genericPartitionMap *)
1209                                 &(lvd->partitionMaps[offset]);
1210                 type = gpm->partitionMapType;
1211                 if (type == 1) {
1212                         struct genericPartitionMap1 *gpm1 =
1213                                 (struct genericPartitionMap1 *)gpm;
1214                         map->s_partition_type = UDF_TYPE1_MAP15;
1215                         map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1216                         map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1217                         map->s_partition_func = NULL;
1218                 } else if (type == 2) {
1219                         struct udfPartitionMap2 *upm2 =
1220                                                 (struct udfPartitionMap2 *)gpm;
1221                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1222                                                 strlen(UDF_ID_VIRTUAL))) {
1223                                 u16 suf =
1224                                         le16_to_cpu(((__le16 *)upm2->partIdent.
1225                                                         identSuffix)[0]);
1226                                 if (suf == 0x0150) {
1227                                         map->s_partition_type =
1228                                                         UDF_VIRTUAL_MAP15;
1229                                         map->s_partition_func =
1230                                                         udf_get_pblock_virt15;
1231                                 } else if (suf == 0x0200) {
1232                                         map->s_partition_type =
1233                                                         UDF_VIRTUAL_MAP20;
1234                                         map->s_partition_func =
1235                                                         udf_get_pblock_virt20;
1236                                 }
1237                         } else if (!strncmp(upm2->partIdent.ident,
1238                                                 UDF_ID_SPARABLE,
1239                                                 strlen(UDF_ID_SPARABLE))) {
1240                                 uint32_t loc;
1241                                 uint16_t ident;
1242                                 struct sparingTable *st;
1243                                 struct sparablePartitionMap *spm =
1244                                         (struct sparablePartitionMap *)gpm;
1245
1246                                 map->s_partition_type = UDF_SPARABLE_MAP15;
1247                                 map->s_type_specific.s_sparing.s_packet_len =
1248                                                 le16_to_cpu(spm->packetLength);
1249                                 for (j = 0; j < spm->numSparingTables; j++) {
1250                                         struct buffer_head *bh2;
1251
1252                                         loc = le32_to_cpu(
1253                                                 spm->locSparingTable[j]);
1254                                         bh2 = udf_read_tagged(sb, loc, loc,
1255                                                              &ident);
1256                                         map->s_type_specific.s_sparing.
1257                                                         s_spar_map[j] = bh2;
1258
1259                                         if (bh2 != NULL) {
1260                                                 st = (struct sparingTable *)
1261                                                                 bh2->b_data;
1262                                                 if (ident != 0 || strncmp(
1263                                                         st->sparingIdent.ident,
1264                                                         UDF_ID_SPARING,
1265                                                         strlen(UDF_ID_SPARING))) {
1266                                                         brelse(bh2);
1267                                                         map->s_type_specific.
1268                                                                 s_sparing.
1269                                                                 s_spar_map[j] =
1270                                                                         NULL;
1271                                                 }
1272                                         }
1273                                 }
1274                                 map->s_partition_func = udf_get_pblock_spar15;
1275                         } else {
1276                                 udf_debug("Unknown ident: %s\n",
1277                                           upm2->partIdent.ident);
1278                                 continue;
1279                         }
1280                         map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1281                         map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1282                 }
1283                 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1284                           i, map->s_partition_num, type,
1285                           map->s_volumeseqnum);
1286         }
1287
1288         if (fileset) {
1289                 long_ad *la = (long_ad *)&(lvd->logicalVolContentsUse[0]);
1290
1291                 *fileset = lelb_to_cpu(la->extLocation);
1292                 udf_debug("FileSet found in LogicalVolDesc at block=%d, "
1293                           "partition=%d\n", fileset->logicalBlockNum,
1294                           fileset->partitionReferenceNum);
1295         }
1296         if (lvd->integritySeqExt.extLength)
1297                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1298
1299         return 0;
1300 }
1301
1302 /*
1303  * udf_load_logicalvolint
1304  *
1305  */
1306 static void udf_load_logicalvolint(struct super_block *sb, kernel_extent_ad loc)
1307 {
1308         struct buffer_head *bh = NULL;
1309         uint16_t ident;
1310         struct udf_sb_info *sbi = UDF_SB(sb);
1311         struct logicalVolIntegrityDesc *lvid;
1312
1313         while (loc.extLength > 0 &&
1314                (bh = udf_read_tagged(sb, loc.extLocation,
1315                                      loc.extLocation, &ident)) &&
1316                ident == TAG_IDENT_LVID) {
1317                 sbi->s_lvid_bh = bh;
1318                 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1319
1320                 if (lvid->nextIntegrityExt.extLength)
1321                         udf_load_logicalvolint(sb,
1322                                 leea_to_cpu(lvid->nextIntegrityExt));
1323
1324                 if (sbi->s_lvid_bh != bh)
1325                         brelse(bh);
1326                 loc.extLength -= sb->s_blocksize;
1327                 loc.extLocation++;
1328         }
1329         if (sbi->s_lvid_bh != bh)
1330                 brelse(bh);
1331 }
1332
1333 /*
1334  * udf_process_sequence
1335  *
1336  * PURPOSE
1337  *      Process a main/reserve volume descriptor sequence.
1338  *
1339  * PRE-CONDITIONS
1340  *      sb                      Pointer to _locked_ superblock.
1341  *      block                   First block of first extent of the sequence.
1342  *      lastblock               Lastblock of first extent of the sequence.
1343  *
1344  * HISTORY
1345  *      July 1, 1997 - Andrew E. Mileski
1346  *      Written, tested, and released.
1347  */
1348 static int udf_process_sequence(struct super_block *sb, long block,
1349                                 long lastblock, kernel_lb_addr *fileset)
1350 {
1351         struct buffer_head *bh = NULL;
1352         struct udf_vds_record vds[VDS_POS_LENGTH];
1353         struct udf_vds_record *curr;
1354         struct generic_desc *gd;
1355         struct volDescPtr *vdp;
1356         int done = 0;
1357         int i, j;
1358         uint32_t vdsn;
1359         uint16_t ident;
1360         long next_s = 0, next_e = 0;
1361
1362         memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1363
1364         /* Read the main descriptor sequence */
1365         for (; (!done && block <= lastblock); block++) {
1366
1367                 bh = udf_read_tagged(sb, block, block, &ident);
1368                 if (!bh)
1369                         break;
1370
1371                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1372                 gd = (struct generic_desc *)bh->b_data;
1373                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1374                 switch (ident) {
1375                 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1376                         curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1377                         if (vdsn >= curr->volDescSeqNum) {
1378                                 curr->volDescSeqNum = vdsn;
1379                                 curr->block = block;
1380                         }
1381                         break;
1382                 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1383                         curr = &vds[VDS_POS_VOL_DESC_PTR];
1384                         if (vdsn >= curr->volDescSeqNum) {
1385                                 curr->volDescSeqNum = vdsn;
1386                                 curr->block = block;
1387
1388                                 vdp = (struct volDescPtr *)bh->b_data;
1389                                 next_s = le32_to_cpu(
1390                                         vdp->nextVolDescSeqExt.extLocation);
1391                                 next_e = le32_to_cpu(
1392                                         vdp->nextVolDescSeqExt.extLength);
1393                                 next_e = next_e >> sb->s_blocksize_bits;
1394                                 next_e += next_s;
1395                         }
1396                         break;
1397                 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1398                         curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1399                         if (vdsn >= curr->volDescSeqNum) {
1400                                 curr->volDescSeqNum = vdsn;
1401                                 curr->block = block;
1402                         }
1403                         break;
1404                 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1405                         curr = &vds[VDS_POS_PARTITION_DESC];
1406                         if (!curr->block)
1407                                 curr->block = block;
1408                         break;
1409                 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1410                         curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1411                         if (vdsn >= curr->volDescSeqNum) {
1412                                 curr->volDescSeqNum = vdsn;
1413                                 curr->block = block;
1414                         }
1415                         break;
1416                 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1417                         curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1418                         if (vdsn >= curr->volDescSeqNum) {
1419                                 curr->volDescSeqNum = vdsn;
1420                                 curr->block = block;
1421                         }
1422                         break;
1423                 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1424                         vds[VDS_POS_TERMINATING_DESC].block = block;
1425                         if (next_e) {
1426                                 block = next_s;
1427                                 lastblock = next_e;
1428                                 next_s = next_e = 0;
1429                         } else
1430                                 done = 1;
1431                         break;
1432                 }
1433                 brelse(bh);
1434         }
1435         for (i = 0; i < VDS_POS_LENGTH; i++) {
1436                 if (vds[i].block) {
1437                         bh = udf_read_tagged(sb, vds[i].block, vds[i].block,
1438                                              &ident);
1439
1440                         if (i == VDS_POS_PRIMARY_VOL_DESC) {
1441                                 udf_load_pvoldesc(sb, bh);
1442                         } else if (i == VDS_POS_LOGICAL_VOL_DESC) {
1443                                 if (udf_load_logicalvol(sb, bh, fileset)) {
1444                                         brelse(bh);
1445                                         return 1;
1446                                 }
1447                         } else if (i == VDS_POS_PARTITION_DESC) {
1448                                 struct buffer_head *bh2 = NULL;
1449                                 if (udf_load_partdesc(sb, bh)) {
1450                                         brelse(bh);
1451                                         return 1;
1452                                 }
1453                                 for (j = vds[i].block + 1;
1454                                      j <  vds[VDS_POS_TERMINATING_DESC].block;
1455                                      j++) {
1456                                         bh2 = udf_read_tagged(sb, j, j, &ident);
1457                                         gd = (struct generic_desc *)bh2->b_data;
1458                                         if (ident == TAG_IDENT_PD)
1459                                                 if (udf_load_partdesc(sb,
1460                                                                       bh2)) {
1461                                                         brelse(bh);
1462                                                         brelse(bh2);
1463                                                         return 1;
1464                                                 }
1465                                         brelse(bh2);
1466                                 }
1467                         }
1468                         brelse(bh);
1469                 }
1470         }
1471
1472         return 0;
1473 }
1474
1475 /*
1476  * udf_check_valid()
1477  */
1478 static int udf_check_valid(struct super_block *sb, int novrs, int silent)
1479 {
1480         long block;
1481
1482         if (novrs) {
1483                 udf_debug("Validity check skipped because of novrs option\n");
1484                 return 0;
1485         }
1486         /* Check that it is NSR02 compliant */
1487         /* Process any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
1488         else {
1489                 block = udf_vrs(sb, silent);
1490                 if (block == -1) {
1491                         struct udf_sb_info *sbi = UDF_SB(sb);
1492                         udf_debug("Failed to read byte 32768. Assuming open "
1493                                   "disc. Skipping validity check\n");
1494                         if (!sbi->s_last_block)
1495                                 sbi->s_last_block = udf_get_last_block(sb);
1496                         return 0;
1497                 } else
1498                         return !block;
1499         }
1500 }
1501
1502 static int udf_load_partition(struct super_block *sb, kernel_lb_addr *fileset)
1503 {
1504         struct anchorVolDescPtr *anchor;
1505         uint16_t ident;
1506         struct buffer_head *bh;
1507         long main_s, main_e, reserve_s, reserve_e;
1508         int i, j;
1509         struct udf_sb_info *sbi;
1510
1511         if (!sb)
1512                 return 1;
1513         sbi = UDF_SB(sb);
1514
1515         for (i = 0; i < ARRAY_SIZE(sbi->s_anchor); i++) {
1516                 if (!sbi->s_anchor[i])
1517                         continue;
1518                 bh = udf_read_tagged(sb, sbi->s_anchor[i], sbi->s_anchor[i],
1519                                      &ident);
1520                 if (!bh)
1521                         continue;
1522
1523                 anchor = (struct anchorVolDescPtr *)bh->b_data;
1524
1525                 /* Locate the main sequence */
1526                 main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1527                 main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1528                 main_e = main_e >> sb->s_blocksize_bits;
1529                 main_e += main_s;
1530
1531                 /* Locate the reserve sequence */
1532                 reserve_s = le32_to_cpu(
1533                                 anchor->reserveVolDescSeqExt.extLocation);
1534                 reserve_e = le32_to_cpu(
1535                                 anchor->reserveVolDescSeqExt.extLength);
1536                 reserve_e = reserve_e >> sb->s_blocksize_bits;
1537                 reserve_e += reserve_s;
1538
1539                 brelse(bh);
1540
1541                 /* Process the main & reserve sequences */
1542                 /* responsible for finding the PartitionDesc(s) */
1543                 if (!(udf_process_sequence(sb, main_s, main_e,
1544                                            fileset) &&
1545                       udf_process_sequence(sb, reserve_s, reserve_e,
1546                                            fileset)))
1547                         break;
1548         }
1549
1550         if (i == ARRAY_SIZE(sbi->s_anchor)) {
1551                 udf_debug("No Anchor block found\n");
1552                 return 1;
1553         }
1554         udf_debug("Using anchor in block %d\n", sbi->s_anchor[i]);
1555
1556         for (i = 0; i < sbi->s_partitions; i++) {
1557                 kernel_lb_addr uninitialized_var(ino);
1558                 struct udf_part_map *map = &sbi->s_partmaps[i];
1559                 switch (map->s_partition_type) {
1560                 case UDF_VIRTUAL_MAP15:
1561                 case UDF_VIRTUAL_MAP20:
1562                         if (!sbi->s_last_block) {
1563                                 sbi->s_last_block = udf_get_last_block(sb);
1564                                 udf_find_anchor(sb);
1565                         }
1566
1567                         if (!sbi->s_last_block) {
1568                                 udf_debug("Unable to determine Lastblock (For "
1569                                           "Virtual Partition)\n");
1570                                 return 1;
1571                         }
1572
1573                         for (j = 0; j < sbi->s_partitions; j++) {
1574                                 struct udf_part_map *map2 = &sbi->s_partmaps[j];
1575                                 if (j != i &&
1576                                     map->s_volumeseqnum ==
1577                                                 map2->s_volumeseqnum &&
1578                                     map->s_partition_num ==
1579                                                 map2->s_partition_num) {
1580                                         ino.partitionReferenceNum = j;
1581                                         ino.logicalBlockNum =
1582                                                 sbi->s_last_block -
1583                                                         map2->s_partition_root;
1584                                         break;
1585                                 }
1586                         }
1587
1588                         if (j == sbi->s_partitions)
1589                                 return 1;
1590
1591                         sbi->s_vat_inode = udf_iget(sb, ino);
1592                         if (!sbi->s_vat_inode)
1593                                 return 1;
1594
1595                         if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1596                                 map->s_type_specific.s_virtual.s_start_offset =
1597                                         udf_ext0_offset(sbi->s_vat_inode);
1598                                 map->s_type_specific.s_virtual.s_num_entries =
1599                                         (sbi->s_vat_inode->i_size - 36) >> 2;
1600                         } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1601                                 uint32_t pos;
1602                                 struct virtualAllocationTable20 *vat20;
1603
1604                                 pos = udf_block_map(sbi->s_vat_inode, 0);
1605                                 bh = sb_bread(sb, pos);
1606                                 if (!bh)
1607                                         return 1;
1608                                 vat20 = (struct virtualAllocationTable20 *)
1609                                         bh->b_data +
1610                                         udf_ext0_offset(sbi->s_vat_inode);
1611                                 map->s_type_specific.s_virtual.s_start_offset =
1612                                         le16_to_cpu(vat20->lengthHeader) +
1613                                         udf_ext0_offset(sbi->s_vat_inode);
1614                                 map->s_type_specific.s_virtual.s_num_entries =
1615                                         (sbi->s_vat_inode->i_size -
1616                                          map->s_type_specific.s_virtual.
1617                                                         s_start_offset) >> 2;
1618                                 brelse(bh);
1619                         }
1620                         map->s_partition_root = udf_get_pblock(sb, 0, i, 0);
1621                         map->s_partition_len =
1622                                 sbi->s_partmaps[ino.partitionReferenceNum].
1623                                                                 s_partition_len;
1624                 }
1625         }
1626         return 0;
1627 }
1628
1629 static void udf_open_lvid(struct super_block *sb)
1630 {
1631         struct udf_sb_info *sbi = UDF_SB(sb);
1632         struct buffer_head *bh = sbi->s_lvid_bh;
1633         if (bh) {
1634                 kernel_timestamp cpu_time;
1635                 struct logicalVolIntegrityDesc *lvid =
1636                                 (struct logicalVolIntegrityDesc *)bh->b_data;
1637                 struct logicalVolIntegrityDescImpUse *lvidiu =
1638                                                         udf_sb_lvidiu(sbi);
1639
1640                 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1641                 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1642                 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
1643                         lvid->recordingDateAndTime = cpu_to_lets(cpu_time);
1644                 lvid->integrityType = LVID_INTEGRITY_TYPE_OPEN;
1645
1646                 lvid->descTag.descCRC = cpu_to_le16(
1647                         udf_crc((char *)lvid + sizeof(tag),
1648                                 le16_to_cpu(lvid->descTag.descCRCLength),
1649                                 0));
1650
1651                 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1652                 mark_buffer_dirty(bh);
1653         }
1654 }
1655
1656 static void udf_close_lvid(struct super_block *sb)
1657 {
1658         kernel_timestamp cpu_time;
1659         struct udf_sb_info *sbi = UDF_SB(sb);
1660         struct buffer_head *bh = sbi->s_lvid_bh;
1661         struct logicalVolIntegrityDesc *lvid;
1662
1663         if (!bh)
1664                 return;
1665
1666         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1667
1668         if (lvid->integrityType == LVID_INTEGRITY_TYPE_OPEN) {
1669                 struct logicalVolIntegrityDescImpUse *lvidiu =
1670                                                         udf_sb_lvidiu(sbi);
1671                 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1672                 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1673                 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
1674                         lvid->recordingDateAndTime = cpu_to_lets(cpu_time);
1675                 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1676                         lvidiu->maxUDFWriteRev =
1677                                         cpu_to_le16(UDF_MAX_WRITE_VERSION);
1678                 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1679                         lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1680                 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
1681                         lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
1682                 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1683
1684                 lvid->descTag.descCRC = cpu_to_le16(
1685                         udf_crc((char *)lvid + sizeof(tag),
1686                                 le16_to_cpu(lvid->descTag.descCRCLength),
1687                                 0));
1688
1689                 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1690                 mark_buffer_dirty(bh);
1691         }
1692 }
1693
1694 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
1695 {
1696         int i;
1697         int nr_groups = bitmap->s_nr_groups;
1698         int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
1699                                                 nr_groups);
1700
1701         for (i = 0; i < nr_groups; i++)
1702                 if (bitmap->s_block_bitmap[i])
1703                         brelse(bitmap->s_block_bitmap[i]);
1704
1705         if (size <= PAGE_SIZE)
1706                 kfree(bitmap);
1707         else
1708                 vfree(bitmap);
1709 }
1710
1711 /*
1712  * udf_read_super
1713  *
1714  * PURPOSE
1715  *      Complete the specified super block.
1716  *
1717  * PRE-CONDITIONS
1718  *      sb                      Pointer to superblock to complete - never NULL.
1719  *      sb->s_dev               Device to read suberblock from.
1720  *      options                 Pointer to mount options.
1721  *      silent                  Silent flag.
1722  *
1723  * HISTORY
1724  *      July 1, 1997 - Andrew E. Mileski
1725  *      Written, tested, and released.
1726  */
1727 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1728 {
1729         int i;
1730         struct inode *inode = NULL;
1731         struct udf_options uopt;
1732         kernel_lb_addr rootdir, fileset;
1733         struct udf_sb_info *sbi;
1734
1735         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1736         uopt.uid = -1;
1737         uopt.gid = -1;
1738         uopt.umask = 0;
1739
1740         sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1741         if (!sbi)
1742                 return -ENOMEM;
1743
1744         sb->s_fs_info = sbi;
1745
1746         mutex_init(&sbi->s_alloc_mutex);
1747
1748         if (!udf_parse_options((char *)options, &uopt, false))
1749                 goto error_out;
1750
1751         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1752             uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
1753                 udf_error(sb, "udf_read_super",
1754                           "utf8 cannot be combined with iocharset\n");
1755                 goto error_out;
1756         }
1757 #ifdef CONFIG_UDF_NLS
1758         if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1759                 uopt.nls_map = load_nls_default();
1760                 if (!uopt.nls_map)
1761                         uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1762                 else
1763                         udf_debug("Using default NLS map\n");
1764         }
1765 #endif
1766         if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1767                 uopt.flags |= (1 << UDF_FLAG_UTF8);
1768
1769         fileset.logicalBlockNum = 0xFFFFFFFF;
1770         fileset.partitionReferenceNum = 0xFFFF;
1771
1772         sbi->s_flags = uopt.flags;
1773         sbi->s_uid = uopt.uid;
1774         sbi->s_gid = uopt.gid;
1775         sbi->s_umask = uopt.umask;
1776         sbi->s_nls_map = uopt.nls_map;
1777
1778         /* Set the block size for all transfers */
1779         if (!udf_set_blocksize(sb, uopt.blocksize))
1780                 goto error_out;
1781
1782         if (uopt.session == 0xFFFFFFFF)
1783                 sbi->s_session = udf_get_last_session(sb);
1784         else
1785                 sbi->s_session = uopt.session;
1786
1787         udf_debug("Multi-session=%d\n", sbi->s_session);
1788
1789         sbi->s_last_block = uopt.lastblock;
1790         sbi->s_anchor[0] = sbi->s_anchor[1] = 0;
1791         sbi->s_anchor[2] = uopt.anchor;
1792         sbi->s_anchor[3] = 256;
1793
1794         if (udf_check_valid(sb, uopt.novrs, silent)) {
1795                 /* read volume recognition sequences */
1796                 printk(KERN_WARNING "UDF-fs: No VRS found\n");
1797                 goto error_out;
1798         }
1799
1800         udf_find_anchor(sb);
1801
1802         /* Fill in the rest of the superblock */
1803         sb->s_op = &udf_sb_ops;
1804         sb->dq_op = NULL;
1805         sb->s_dirt = 0;
1806         sb->s_magic = UDF_SUPER_MAGIC;
1807         sb->s_time_gran = 1000;
1808
1809         if (udf_load_partition(sb, &fileset)) {
1810                 printk(KERN_WARNING "UDF-fs: No partition found (1)\n");
1811                 goto error_out;
1812         }
1813
1814         udf_debug("Lastblock=%d\n", sbi->s_last_block);
1815
1816         if (sbi->s_lvid_bh) {
1817                 struct logicalVolIntegrityDescImpUse *lvidiu =
1818                                                         udf_sb_lvidiu(sbi);
1819                 uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
1820                 uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
1821                 /* uint16_t maxUDFWriteRev =
1822                                 le16_to_cpu(lvidiu->maxUDFWriteRev); */
1823
1824                 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
1825                         printk(KERN_ERR "UDF-fs: minUDFReadRev=%x "
1826                                         "(max is %x)\n",
1827                                le16_to_cpu(lvidiu->minUDFReadRev),
1828                                UDF_MAX_READ_VERSION);
1829                         goto error_out;
1830                 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
1831                         sb->s_flags |= MS_RDONLY;
1832
1833                 sbi->s_udfrev = minUDFWriteRev;
1834
1835                 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1836                         UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
1837                 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
1838                         UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
1839         }
1840
1841         if (!sbi->s_partitions) {
1842                 printk(KERN_WARNING "UDF-fs: No partition found (2)\n");
1843                 goto error_out;
1844         }
1845
1846         if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
1847                         UDF_PART_FLAG_READ_ONLY) {
1848                 printk(KERN_NOTICE "UDF-fs: Partition marked readonly; "
1849                                    "forcing readonly mount\n");
1850                 sb->s_flags |= MS_RDONLY;
1851         }
1852
1853         if (udf_find_fileset(sb, &fileset, &rootdir)) {
1854                 printk(KERN_WARNING "UDF-fs: No fileset found\n");
1855                 goto error_out;
1856         }
1857
1858         if (!silent) {
1859                 kernel_timestamp ts;
1860                 udf_time_to_stamp(&ts, sbi->s_record_time);
1861                 udf_info("UDF: Mounting volume '%s', "
1862                          "timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
1863                          sbi->s_volume_ident, ts.year, ts.month, ts.day,
1864                          ts.hour, ts.minute, ts.typeAndTimezone);
1865         }
1866         if (!(sb->s_flags & MS_RDONLY))
1867                 udf_open_lvid(sb);
1868
1869         /* Assign the root inode */
1870         /* assign inodes by physical block number */
1871         /* perhaps it's not extensible enough, but for now ... */
1872         inode = udf_iget(sb, rootdir);
1873         if (!inode) {
1874                 printk(KERN_ERR "UDF-fs: Error in udf_iget, block=%d, "
1875                                 "partition=%d\n",
1876                        rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
1877                 goto error_out;
1878         }
1879
1880         /* Allocate a dentry for the root inode */
1881         sb->s_root = d_alloc_root(inode);
1882         if (!sb->s_root) {
1883                 printk(KERN_ERR "UDF-fs: Couldn't allocate root dentry\n");
1884                 iput(inode);
1885                 goto error_out;
1886         }
1887         sb->s_maxbytes = MAX_LFS_FILESIZE;
1888         return 0;
1889
1890 error_out:
1891         if (sbi->s_vat_inode)
1892                 iput(sbi->s_vat_inode);
1893         if (sbi->s_partitions) {
1894                 struct udf_part_map *map = &sbi->s_partmaps[sbi->s_partition];
1895                 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1896                         iput(map->s_uspace.s_table);
1897                 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1898                         iput(map->s_fspace.s_table);
1899                 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1900                         udf_sb_free_bitmap(map->s_uspace.s_bitmap);
1901                 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1902                         udf_sb_free_bitmap(map->s_fspace.s_bitmap);
1903                 if (map->s_partition_type == UDF_SPARABLE_MAP15)
1904                         for (i = 0; i < 4; i++)
1905                                 brelse(map->s_type_specific.s_sparing.
1906                                                 s_spar_map[i]);
1907         }
1908 #ifdef CONFIG_UDF_NLS
1909         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1910                 unload_nls(sbi->s_nls_map);
1911 #endif
1912         if (!(sb->s_flags & MS_RDONLY))
1913                 udf_close_lvid(sb);
1914         brelse(sbi->s_lvid_bh);
1915
1916         kfree(sbi->s_partmaps);
1917         kfree(sbi);
1918         sb->s_fs_info = NULL;
1919
1920         return -EINVAL;
1921 }
1922
1923 void udf_error(struct super_block *sb, const char *function,
1924                const char *fmt, ...)
1925 {
1926         va_list args;
1927
1928         if (!(sb->s_flags & MS_RDONLY)) {
1929                 /* mark sb error */
1930                 sb->s_dirt = 1;
1931         }
1932         va_start(args, fmt);
1933         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1934         va_end(args);
1935         printk(KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
1936                 sb->s_id, function, error_buf);
1937 }
1938
1939 void udf_warning(struct super_block *sb, const char *function,
1940                  const char *fmt, ...)
1941 {
1942         va_list args;
1943
1944         va_start(args, fmt);
1945         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1946         va_end(args);
1947         printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
1948                sb->s_id, function, error_buf);
1949 }
1950
1951 /*
1952  * udf_put_super
1953  *
1954  * PURPOSE
1955  *      Prepare for destruction of the superblock.
1956  *
1957  * DESCRIPTION
1958  *      Called before the filesystem is unmounted.
1959  *
1960  * HISTORY
1961  *      July 1, 1997 - Andrew E. Mileski
1962  *      Written, tested, and released.
1963  */
1964 static void udf_put_super(struct super_block *sb)
1965 {
1966         int i;
1967         struct udf_sb_info *sbi;
1968
1969         sbi = UDF_SB(sb);
1970         if (sbi->s_vat_inode)
1971                 iput(sbi->s_vat_inode);
1972         if (sbi->s_partitions) {
1973                 struct udf_part_map *map = &sbi->s_partmaps[sbi->s_partition];
1974                 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1975                         iput(map->s_uspace.s_table);
1976                 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1977                         iput(map->s_fspace.s_table);
1978                 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1979                         udf_sb_free_bitmap(map->s_uspace.s_bitmap);
1980                 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1981                         udf_sb_free_bitmap(map->s_fspace.s_bitmap);
1982                 if (map->s_partition_type == UDF_SPARABLE_MAP15)
1983                         for (i = 0; i < 4; i++)
1984                                 brelse(map->s_type_specific.s_sparing.
1985                                                 s_spar_map[i]);
1986         }
1987 #ifdef CONFIG_UDF_NLS
1988         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1989                 unload_nls(sbi->s_nls_map);
1990 #endif
1991         if (!(sb->s_flags & MS_RDONLY))
1992                 udf_close_lvid(sb);
1993         brelse(sbi->s_lvid_bh);
1994         kfree(sbi->s_partmaps);
1995         kfree(sb->s_fs_info);
1996         sb->s_fs_info = NULL;
1997 }
1998
1999 /*
2000  * udf_stat_fs
2001  *
2002  * PURPOSE
2003  *      Return info about the filesystem.
2004  *
2005  * DESCRIPTION
2006  *      Called by sys_statfs()
2007  *
2008  * HISTORY
2009  *      July 1, 1997 - Andrew E. Mileski
2010  *      Written, tested, and released.
2011  */
2012 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
2013 {
2014         struct super_block *sb = dentry->d_sb;
2015         struct udf_sb_info *sbi = UDF_SB(sb);
2016         struct logicalVolIntegrityDescImpUse *lvidiu;
2017
2018         if (sbi->s_lvid_bh != NULL)
2019                 lvidiu = udf_sb_lvidiu(sbi);
2020         else
2021                 lvidiu = NULL;
2022
2023         buf->f_type = UDF_SUPER_MAGIC;
2024         buf->f_bsize = sb->s_blocksize;
2025         buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
2026         buf->f_bfree = udf_count_free(sb);
2027         buf->f_bavail = buf->f_bfree;
2028         buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2029                                           le32_to_cpu(lvidiu->numDirs)) : 0)
2030                         + buf->f_bfree;
2031         buf->f_ffree = buf->f_bfree;
2032         /* __kernel_fsid_t f_fsid */
2033         buf->f_namelen = UDF_NAME_LEN - 2;
2034
2035         return 0;
2036 }
2037
2038 static unsigned char udf_bitmap_lookup[16] = {
2039         0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4
2040 };
2041
2042 static unsigned int udf_count_free_bitmap(struct super_block *sb,
2043                                           struct udf_bitmap *bitmap)
2044 {
2045         struct buffer_head *bh = NULL;
2046         unsigned int accum = 0;
2047         int index;
2048         int block = 0, newblock;
2049         kernel_lb_addr loc;
2050         uint32_t bytes;
2051         uint8_t value;
2052         uint8_t *ptr;
2053         uint16_t ident;
2054         struct spaceBitmapDesc *bm;
2055
2056         lock_kernel();
2057
2058         loc.logicalBlockNum = bitmap->s_extPosition;
2059         loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
2060         bh = udf_read_ptagged(sb, loc, 0, &ident);
2061
2062         if (!bh) {
2063                 printk(KERN_ERR "udf: udf_count_free failed\n");
2064                 goto out;
2065         } else if (ident != TAG_IDENT_SBD) {
2066                 brelse(bh);
2067                 printk(KERN_ERR "udf: udf_count_free failed\n");
2068                 goto out;
2069         }
2070
2071         bm = (struct spaceBitmapDesc *)bh->b_data;
2072         bytes = le32_to_cpu(bm->numOfBytes);
2073         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2074         ptr = (uint8_t *)bh->b_data;
2075
2076         while (bytes > 0) {
2077                 while ((bytes > 0) && (index < sb->s_blocksize)) {
2078                         value = ptr[index];
2079                         accum += udf_bitmap_lookup[value & 0x0f];
2080                         accum += udf_bitmap_lookup[value >> 4];
2081                         index++;
2082                         bytes--;
2083                 }
2084                 if (bytes) {
2085                         brelse(bh);
2086                         newblock = udf_get_lb_pblock(sb, loc, ++block);
2087                         bh = udf_tread(sb, newblock);
2088                         if (!bh) {
2089                                 udf_debug("read failed\n");
2090                                 goto out;
2091                         }
2092                         index = 0;
2093                         ptr = (uint8_t *)bh->b_data;
2094                 }
2095         }
2096         brelse(bh);
2097
2098 out:
2099         unlock_kernel();
2100
2101         return accum;
2102 }
2103
2104 static unsigned int udf_count_free_table(struct super_block *sb,
2105                                          struct inode *table)
2106 {
2107         unsigned int accum = 0;
2108         uint32_t elen;
2109         kernel_lb_addr eloc;
2110         int8_t etype;
2111         struct extent_position epos;
2112
2113         lock_kernel();
2114
2115         epos.block = UDF_I(table)->i_location;
2116         epos.offset = sizeof(struct unallocSpaceEntry);
2117         epos.bh = NULL;
2118
2119         while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2120                 accum += (elen >> table->i_sb->s_blocksize_bits);
2121
2122         brelse(epos.bh);
2123
2124         unlock_kernel();
2125
2126         return accum;
2127 }
2128
2129 static unsigned int udf_count_free(struct super_block *sb)
2130 {
2131         unsigned int accum = 0;
2132         struct udf_sb_info *sbi;
2133         struct udf_part_map *map;
2134
2135         sbi = UDF_SB(sb);
2136         if (sbi->s_lvid_bh) {
2137                 struct logicalVolIntegrityDesc *lvid =
2138                         (struct logicalVolIntegrityDesc *)
2139                         sbi->s_lvid_bh->b_data;
2140                 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
2141                         accum = le32_to_cpu(
2142                                         lvid->freeSpaceTable[sbi->s_partition]);
2143                         if (accum == 0xFFFFFFFF)
2144                                 accum = 0;
2145                 }
2146         }
2147
2148         if (accum)
2149                 return accum;
2150
2151         map = &sbi->s_partmaps[sbi->s_partition];
2152         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2153                 accum += udf_count_free_bitmap(sb,
2154                                                map->s_uspace.s_bitmap);
2155         }
2156         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
2157                 accum += udf_count_free_bitmap(sb,
2158                                                map->s_fspace.s_bitmap);
2159         }
2160         if (accum)
2161                 return accum;
2162
2163         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2164                 accum += udf_count_free_table(sb,
2165                                               map->s_uspace.s_table);
2166         }
2167         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
2168                 accum += udf_count_free_table(sb,
2169                                               map->s_fspace.s_table);
2170         }
2171
2172         return accum;
2173 }