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   1 /*
   2  * super.c
   3  *
   4  * PURPOSE
   5  *  Super block routines for the OSTA-UDF(tm) filesystem.
   6  *
   7  * DESCRIPTION
   8  *  OSTA-UDF(tm) = Optical Storage Technology Association
   9  *  Universal Disk Format.
  10  *
  11  *  This code is based on version 2.00 of the UDF specification,
  12  *  and revision 3 of the ECMA 167 standard [equivalent to ISO 13346].
  13  *    http://www.osta.org/
  14  *    http://www.ecma.ch/
  15  *    http://www.iso.org/
  16  *
  17  * COPYRIGHT
  18  *  This file is distributed under the terms of the GNU General Public
  19  *  License (GPL). Copies of the GPL can be obtained from:
  20  *    ftp://prep.ai.mit.edu/pub/gnu/GPL
  21  *  Each contributing author retains all rights to their own work.
  22  *
  23  *  (C) 1998 Dave Boynton
  24  *  (C) 1998-2004 Ben Fennema
  25  *  (C) 2000 Stelias Computing Inc
  26  *
  27  * HISTORY
  28  *
  29  *  09/24/98 dgb  changed to allow compiling outside of kernel, and
  30  *                added some debugging.
  31  *  10/01/98 dgb  updated to allow (some) possibility of compiling w/2.0.34
  32  *  10/16/98      attempting some multi-session support
  33  *  10/17/98      added freespace count for "df"
  34  *  11/11/98 gr   added novrs option
  35  *  11/26/98 dgb  added fileset,anchor mount options
  36  *  12/06/98 blf  really hosed things royally. vat/sparing support. sequenced
  37  *                vol descs. rewrote option handling based on isofs
  38  *  12/20/98      find the free space bitmap (if it exists)
  39  */
  40
  41 #include "udfdecl.h"
  42
  43 #include <linux/blkdev.h>
  44 #include <linux/slab.h>
  45 #include <linux/kernel.h>
  46 #include <linux/module.h>
  47 #include <linux/parser.h>
  48 #include <linux/stat.h>
  49 #include <linux/cdrom.h>
  50 #include <linux/nls.h>
  51 #include <linux/smp_lock.h>
  52 #include <linux/buffer_head.h>
  53 #include <linux/vfs.h>
  54 #include <linux/vmalloc.h>
  55 #include <linux/errno.h>
  56 #include <linux/mount.h>
  57 #include <linux/seq_file.h>
  58 #include <linux/bitmap.h>
  59 #include <linux/crc-itu-t.h>
  60 #include <asm/byteorder.h>
  61
  62 #include "udf_sb.h"
  63 #include "udf_i.h"
  64
  65 #include <linux/init.h>
  66 #include <asm/uaccess.h>
  67
  68 #define VDS_POS_PRIMARY_VOL_DESC        0
  69 #define VDS_POS_UNALLOC_SPACE_DESC      1
  70 #define VDS_POS_LOGICAL_VOL_DESC        2
  71 #define VDS_POS_PARTITION_DESC          3
  72 #define VDS_POS_IMP_USE_VOL_DESC        4
  73 #define VDS_POS_VOL_DESC_PTR            5
  74 #define VDS_POS_TERMINATING_DESC        6
  75 #define VDS_POS_LENGTH                  7
  76
  77 #define UDF_DEFAULT_BLOCKSIZE 2048
  78
  79 static char error_buf[1024];
  80
  81 /* These are the "meat" - everything else is stuffing */
  82 static int udf_fill_super(struct super_block *, void *, int);
  83 static void udf_put_super(struct super_block *);
  84 static void udf_write_super(struct super_block *);
  85 static int udf_remount_fs(struct super_block *, int *, char *);
  86 static void udf_load_logicalvolint(struct super_block *, struct kernel_extent_ad);
  87 static int udf_find_fileset(struct super_block *, struct kernel_lb_addr *,
  88                             struct kernel_lb_addr *);
  89 static void udf_load_fileset(struct super_block *, struct buffer_head *,
  90                              struct kernel_lb_addr *);
  91 static void udf_open_lvid(struct super_block *);
  92 static void udf_close_lvid(struct super_block *);
  93 static unsigned int udf_count_free(struct super_block *);
  94 static int udf_statfs(struct dentry *, struct kstatfs *);
  95 static int udf_show_options(struct seq_file *, struct vfsmount *);
  96 static void udf_error(struct super_block *sb, const char *function,
  97                       const char *fmt, ...);
  98
  99 struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct udf_sb_info *sbi)
 100 {
 101         struct logicalVolIntegrityDesc *lvid =
 102                 (struct logicalVolIntegrityDesc *)sbi->s_lvid_bh->b_data;
 103         __u32 number_of_partitions = le32_to_cpu(lvid->numOfPartitions);
 104         __u32 offset = number_of_partitions * 2 *
 105                                 sizeof(uint32_t)/sizeof(uint8_t);
 106         return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
 107 }
 108
 109 /* UDF filesystem type */
 110 static int udf_get_sb(struct file_system_type *fs_type,
 111                       int flags, const char *dev_name, void *data,
 112                       struct vfsmount *mnt)
 113 {
 114         return get_sb_bdev(fs_type, flags, dev_name, data, udf_fill_super, mnt);
 115 }
 116
 117 static struct file_system_type udf_fstype = {
 118         .owner          = THIS_MODULE,
 119         .name           = "udf",
 120         .get_sb         = udf_get_sb,
 121         .kill_sb        = kill_block_super,
 122         .fs_flags       = FS_REQUIRES_DEV,
 123 };
 124
 125 static struct kmem_cache *udf_inode_cachep;
 126
 127 static struct inode *udf_alloc_inode(struct super_block *sb)
 128 {
 129         struct udf_inode_info *ei;
 130         ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
 131         if (!ei)
 132                 return NULL;
 133
 134         ei->i_unique = 0;
 135         ei->i_lenExtents = 0;
 136         ei->i_next_alloc_block = 0;
 137         ei->i_next_alloc_goal = 0;
 138         ei->i_strat4096 = 0;
 139
 140         return &ei->vfs_inode;
 141 }
 142
 143 static void udf_destroy_inode(struct inode *inode)
 144 {
 145         kmem_cache_free(udf_inode_cachep, UDF_I(inode));
 146 }
 147
 148 static void init_once(void *foo)
 149 {
 150         struct udf_inode_info *ei = (struct udf_inode_info *)foo;
 151
 152         ei->i_ext.i_data = NULL;
 153         inode_init_once(&ei->vfs_inode);
 154 }
 155
 156 static int init_inodecache(void)
 157 {
 158         udf_inode_cachep = kmem_cache_create("udf_inode_cache",
 159                                              sizeof(struct udf_inode_info),
 160                                              0, (SLAB_RECLAIM_ACCOUNT |
 161                                                  SLAB_MEM_SPREAD),
 162                                              init_once);
 163         if (!udf_inode_cachep)
 164                 return -ENOMEM;
 165         return 0;
 166 }
 167
 168 static void destroy_inodecache(void)
 169 {
 170         kmem_cache_destroy(udf_inode_cachep);
 171 }
 172
 173 /* Superblock operations */
 174 static const struct super_operations udf_sb_ops = {
 175         .alloc_inode    = udf_alloc_inode,
 176         .destroy_inode  = udf_destroy_inode,
 177         .write_inode    = udf_write_inode,
 178         .delete_inode   = udf_delete_inode,
 179         .clear_inode    = udf_clear_inode,
 180         .put_super      = udf_put_super,
 181         .write_super    = udf_write_super,
 182         .statfs         = udf_statfs,
 183         .remount_fs     = udf_remount_fs,
 184         .show_options   = udf_show_options,
 185 };
 186
 187 struct udf_options {
 188         unsigned char novrs;
 189         unsigned int blocksize;
 190         unsigned int session;
 191         unsigned int lastblock;
 192         unsigned int anchor;
 193         unsigned int volume;
 194         unsigned short partition;
 195         unsigned int fileset;
 196         unsigned int rootdir;
 197         unsigned int flags;
 198         mode_t umask;
 199         gid_t gid;
 200         uid_t uid;
 201         mode_t fmode;
 202         mode_t dmode;
 203         struct nls_table *nls_map;
 204 };
 205
 206 static int __init init_udf_fs(void)
 207 {
 208         int err;
 209
 210         err = init_inodecache();
 211         if (err)
 212                 goto out1;
 213         err = register_filesystem(&udf_fstype);
 214         if (err)
 215                 goto out;
 216
 217         return 0;
 218
 219 out:
 220         destroy_inodecache();
 221
 222 out1:
 223         return err;
 224 }
 225
 226 static void __exit exit_udf_fs(void)
 227 {
 228         unregister_filesystem(&udf_fstype);
 229         destroy_inodecache();
 230 }
 231
 232 module_init(init_udf_fs)
 233 module_exit(exit_udf_fs)
 234
 235 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
 236 {
 237         struct udf_sb_info *sbi = UDF_SB(sb);
 238
 239         sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map),
 240                                   GFP_KERNEL);
 241         if (!sbi->s_partmaps) {
 242                 udf_error(sb, __func__,
 243                           "Unable to allocate space for %d partition maps",
 244                           count);
 245                 sbi->s_partitions = 0;
 246                 return -ENOMEM;
 247         }
 248
 249         sbi->s_partitions = count;
 250         return 0;
 251 }
 252
 253 static int udf_show_options(struct seq_file *seq, struct vfsmount *mnt)
 254 {
 255         struct super_block *sb = mnt->mnt_sb;
 256         struct udf_sb_info *sbi = UDF_SB(sb);
 257
 258         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
 259                 seq_puts(seq, ",nostrict");
 260         if (UDF_QUERY_FLAG(sb, UDF_FLAG_BLOCKSIZE_SET))
 261                 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
 262         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
 263                 seq_puts(seq, ",unhide");
 264         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
 265                 seq_puts(seq, ",undelete");
 266         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
 267                 seq_puts(seq, ",noadinicb");
 268         if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
 269                 seq_puts(seq, ",shortad");
 270         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
 271                 seq_puts(seq, ",uid=forget");
 272         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_IGNORE))
 273                 seq_puts(seq, ",uid=ignore");
 274         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
 275                 seq_puts(seq, ",gid=forget");
 276         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE))
 277                 seq_puts(seq, ",gid=ignore");
 278         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
 279                 seq_printf(seq, ",uid=%u", sbi->s_uid);
 280         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
 281                 seq_printf(seq, ",gid=%u", sbi->s_gid);
 282         if (sbi->s_umask != 0)
 283                 seq_printf(seq, ",umask=%o", sbi->s_umask);
 284         if (sbi->s_fmode != UDF_INVALID_MODE)
 285                 seq_printf(seq, ",mode=%o", sbi->s_fmode);
 286         if (sbi->s_dmode != UDF_INVALID_MODE)
 287                 seq_printf(seq, ",dmode=%o", sbi->s_dmode);
 288         if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
 289                 seq_printf(seq, ",session=%u", sbi->s_session);
 290         if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
 291                 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
 292         if (sbi->s_anchor != 0)
 293                 seq_printf(seq, ",anchor=%u", sbi->s_anchor);
 294         /*
 295          * volume, partition, fileset and rootdir seem to be ignored
 296          * currently
 297          */
 298         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
 299                 seq_puts(seq, ",utf8");
 300         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
 301                 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
 302
 303         return 0;
 304 }
 305
 306 /*
 307  * udf_parse_options
 308  *
 309  * PURPOSE
 310  *      Parse mount options.
 311  *
 312  * DESCRIPTION
 313  *      The following mount options are supported:
 314  *
 315  *      gid=            Set the default group.
 316  *      umask=          Set the default umask.
 317  *      mode=           Set the default file permissions.
 318  *      dmode=          Set the default directory permissions.
 319  *      uid=            Set the default user.
 320  *      bs=             Set the block size.
 321  *      unhide          Show otherwise hidden files.
 322  *      undelete        Show deleted files in lists.
 323  *      adinicb         Embed data in the inode (default)
 324  *      noadinicb       Don't embed data in the inode
 325  *      shortad         Use short ad's
 326  *      longad          Use long ad's (default)
 327  *      nostrict        Unset strict conformance
 328  *      iocharset=      Set the NLS character set
 329  *
 330  *      The remaining are for debugging and disaster recovery:
 331  *
 332  *      novrs           Skip volume sequence recognition
 333  *
 334  *      The following expect a offset from 0.
 335  *
 336  *      session=        Set the CDROM session (default= last session)
 337  *      anchor=         Override standard anchor location. (default= 256)
 338  *      volume=         Override the VolumeDesc location. (unused)
 339  *      partition=      Override the PartitionDesc location. (unused)
 340  *      lastblock=      Set the last block of the filesystem/
 341  *
 342  *      The following expect a offset from the partition root.
 343  *
 344  *      fileset=        Override the fileset block location. (unused)
 345  *      rootdir=        Override the root directory location. (unused)
 346  *              WARNING: overriding the rootdir to a non-directory may
 347  *              yield highly unpredictable results.
 348  *
 349  * PRE-CONDITIONS
 350  *      options         Pointer to mount options string.
 351  *      uopts           Pointer to mount options variable.
 352  *
 353  * POST-CONDITIONS
 354  *      <return>        1       Mount options parsed okay.
 355  *      <return>        0       Error parsing mount options.
 356  *
 357  * HISTORY
 358  *      July 1, 1997 - Andrew E. Mileski
 359  *      Written, tested, and released.
 360  */
 361
 362 enum {
 363         Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
 364         Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
 365         Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
 366         Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
 367         Opt_rootdir, Opt_utf8, Opt_iocharset,
 368         Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore,
 369         Opt_fmode, Opt_dmode
 370 };
 371
 372 static const match_table_t tokens = {
 373         {Opt_novrs,     "novrs"},
 374         {Opt_nostrict,  "nostrict"},
 375         {Opt_bs,        "bs=%u"},
 376         {Opt_unhide,    "unhide"},
 377         {Opt_undelete,  "undelete"},
 378         {Opt_noadinicb, "noadinicb"},
 379         {Opt_adinicb,   "adinicb"},
 380         {Opt_shortad,   "shortad"},
 381         {Opt_longad,    "longad"},
 382         {Opt_uforget,   "uid=forget"},
 383         {Opt_uignore,   "uid=ignore"},
 384         {Opt_gforget,   "gid=forget"},
 385         {Opt_gignore,   "gid=ignore"},
 386         {Opt_gid,       "gid=%u"},
 387         {Opt_uid,       "uid=%u"},
 388         {Opt_umask,     "umask=%o"},
 389         {Opt_session,   "session=%u"},
 390         {Opt_lastblock, "lastblock=%u"},
 391         {Opt_anchor,    "anchor=%u"},
 392         {Opt_volume,    "volume=%u"},
 393         {Opt_partition, "partition=%u"},
 394         {Opt_fileset,   "fileset=%u"},
 395         {Opt_rootdir,   "rootdir=%u"},
 396         {Opt_utf8,      "utf8"},
 397         {Opt_iocharset, "iocharset=%s"},
 398         {Opt_fmode,     "mode=%o"},
 399         {Opt_dmode,     "dmode=%o"},
 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->partition = 0xFFFF;
 411         uopt->session = 0xFFFFFFFF;
 412         uopt->lastblock = 0;
 413         uopt->anchor = 0;
 414         uopt->volume = 0xFFFFFFFF;
 415         uopt->rootdir = 0xFFFFFFFF;
 416         uopt->fileset = 0xFFFFFFFF;
 417         uopt->nls_map = NULL;
 418
 419         if (!options)
 420                 return 1;
 421
 422         while ((p = strsep(&options, ",")) != NULL) {
 423                 substring_t args[MAX_OPT_ARGS];
 424                 int token;
 425                 if (!*p)
 426                         continue;
 427
 428                 token = match_token(p, tokens, args);
 429                 switch (token) {
 430                 case Opt_novrs:
 431                         uopt->novrs = 1;
 432                         break;
 433                 case Opt_bs:
 434                         if (match_int(&args[0], &option))
 435                                 return 0;
 436                         uopt->blocksize = option;
 437                         uopt->flags |= (1 << UDF_FLAG_BLOCKSIZE_SET);
 438                         break;
 439                 case Opt_unhide:
 440                         uopt->flags |= (1 << UDF_FLAG_UNHIDE);
 441                         break;
 442                 case Opt_undelete:
 443                         uopt->flags |= (1 << UDF_FLAG_UNDELETE);
 444                         break;
 445                 case Opt_noadinicb:
 446                         uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
 447                         break;
 448                 case Opt_adinicb:
 449                         uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
 450                         break;
 451                 case Opt_shortad:
 452                         uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
 453                         break;
 454                 case Opt_longad:
 455                         uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
 456                         break;
 457                 case Opt_gid:
 458                         if (match_int(args, &option))
 459                                 return 0;
 460                         uopt->gid = option;
 461                         uopt->flags |= (1 << UDF_FLAG_GID_SET);
 462                         break;
 463                 case Opt_uid:
 464                         if (match_int(args, &option))
 465                                 return 0;
 466                         uopt->uid = option;
 467                         uopt->flags |= (1 << UDF_FLAG_UID_SET);
 468                         break;
 469                 case Opt_umask:
 470                         if (match_octal(args, &option))
 471                                 return 0;
 472                         uopt->umask = option;
 473                         break;
 474                 case Opt_nostrict:
 475                         uopt->flags &= ~(1 << UDF_FLAG_STRICT);
 476                         break;
 477                 case Opt_session:
 478                         if (match_int(args, &option))
 479                                 return 0;
 480                         uopt->session = option;
 481                         if (!remount)
 482                                 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
 483                         break;
 484                 case Opt_lastblock:
 485                         if (match_int(args, &option))
 486                                 return 0;
 487                         uopt->lastblock = option;
 488                         if (!remount)
 489                                 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
 490                         break;
 491                 case Opt_anchor:
 492                         if (match_int(args, &option))
 493                                 return 0;
 494                         uopt->anchor = option;
 495                         break;
 496                 case Opt_volume:
 497                         if (match_int(args, &option))
 498                                 return 0;
 499                         uopt->volume = option;
 500                         break;
 501                 case Opt_partition:
 502                         if (match_int(args, &option))
 503                                 return 0;
 504                         uopt->partition = option;
 505                         break;
 506                 case Opt_fileset:
 507                         if (match_int(args, &option))
 508                                 return 0;
 509                         uopt->fileset = option;
 510                         break;
 511                 case Opt_rootdir:
 512                         if (match_int(args, &option))
 513                                 return 0;
 514                         uopt->rootdir = option;
 515                         break;
 516                 case Opt_utf8:
 517                         uopt->flags |= (1 << UDF_FLAG_UTF8);
 518                         break;
 519 #ifdef CONFIG_UDF_NLS
 520                 case Opt_iocharset:
 521                         uopt->nls_map = load_nls(args[0].from);
 522                         uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
 523                         break;
 524 #endif
 525                 case Opt_uignore:
 526                         uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
 527                         break;
 528                 case Opt_uforget:
 529                         uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
 530                         break;
 531                 case Opt_gignore:
 532                         uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
 533                         break;
 534                 case Opt_gforget:
 535                         uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
 536                         break;
 537                 case Opt_fmode:
 538                         if (match_octal(args, &option))
 539                                 return 0;
 540                         uopt->fmode = option & 0777;
 541                         break;
 542                 case Opt_dmode:
 543                         if (match_octal(args, &option))
 544                                 return 0;
 545                         uopt->dmode = option & 0777;
 546                         break;
 547                 default:
 548                         printk(KERN_ERR "udf: bad mount option \"%s\" "
 549                                "or missing value\n", p);
 550                         return 0;
 551                 }
 552         }
 553         return 1;
 554 }
 555
 556 static void udf_write_super(struct super_block *sb)
 557 {
 558         lock_kernel();
 559
 560         if (!(sb->s_flags & MS_RDONLY))
 561                 udf_open_lvid(sb);
 562         sb->s_dirt = 0;
 563
 564         unlock_kernel();
 565 }
 566
 567 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
 568 {
 569         struct udf_options uopt;
 570         struct udf_sb_info *sbi = UDF_SB(sb);
 571
 572         uopt.flags = sbi->s_flags;
 573         uopt.uid   = sbi->s_uid;
 574         uopt.gid   = sbi->s_gid;
 575         uopt.umask = sbi->s_umask;
 576         uopt.fmode = sbi->s_fmode;
 577         uopt.dmode = sbi->s_dmode;
 578
 579         if (!udf_parse_options(options, &uopt, true))
 580                 return -EINVAL;
 581
 582         sbi->s_flags = uopt.flags;
 583         sbi->s_uid   = uopt.uid;
 584         sbi->s_gid   = uopt.gid;
 585         sbi->s_umask = uopt.umask;
 586         sbi->s_fmode = uopt.fmode;
 587         sbi->s_dmode = uopt.dmode;
 588
 589         if (sbi->s_lvid_bh) {
 590                 int write_rev = le16_to_cpu(udf_sb_lvidiu(sbi)->minUDFWriteRev);
 591                 if (write_rev > UDF_MAX_WRITE_VERSION)
 592                         *flags |= MS_RDONLY;
 593         }
 594
 595         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 596                 return 0;
 597         if (*flags & MS_RDONLY)
 598                 udf_close_lvid(sb);
 599         else
 600                 udf_open_lvid(sb);
 601
 602         return 0;
 603 }
 604
 605 /* Check Volume Structure Descriptors (ECMA 167 2/9.1) */
 606 /* We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
 607 static loff_t udf_check_vsd(struct super_block *sb)
 608 {
 609         struct volStructDesc *vsd = NULL;
 610         loff_t sector = 32768;
 611         int sectorsize;
 612         struct buffer_head *bh = NULL;
 613         int nsr02 = 0;
 614         int nsr03 = 0;
 615         struct udf_sb_info *sbi;
 616
 617         sbi = UDF_SB(sb);
 618         if (sb->s_blocksize < sizeof(struct volStructDesc))
 619                 sectorsize = sizeof(struct volStructDesc);
 620         else
 621                 sectorsize = sb->s_blocksize;
 622
 623         sector += (sbi->s_session << sb->s_blocksize_bits);
 624
 625         udf_debug("Starting at sector %u (%ld byte sectors)\n",
 626                   (unsigned int)(sector >> sb->s_blocksize_bits),
 627                   sb->s_blocksize);
 628         /* Process the sequence (if applicable) */
 629         for (; !nsr02 && !nsr03; sector += sectorsize) {
 630                 /* Read a block */
 631                 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
 632                 if (!bh)
 633                         break;
 634
 635                 /* Look for ISO  descriptors */
 636                 vsd = (struct volStructDesc *)(bh->b_data +
 637                                               (sector & (sb->s_blocksize - 1)));
 638
 639                 if (vsd->stdIdent[0] == 0) {
 640                         brelse(bh);
 641                         break;
 642                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
 643                                     VSD_STD_ID_LEN)) {
 644                         switch (vsd->structType) {
 645                         case 0:
 646                                 udf_debug("ISO9660 Boot Record found\n");
 647                                 break;
 648                         case 1:
 649                                 udf_debug("ISO9660 Primary Volume Descriptor "
 650                                           "found\n");
 651                                 break;
 652                         case 2:
 653                                 udf_debug("ISO9660 Supplementary Volume "
 654                                           "Descriptor found\n");
 655                                 break;
 656                         case 3:
 657                                 udf_debug("ISO9660 Volume Partition Descriptor "
 658                                           "found\n");
 659                                 break;
 660                         case 255:
 661                                 udf_debug("ISO9660 Volume Descriptor Set "
 662                                           "Terminator found\n");
 663                                 break;
 664                         default:
 665                                 udf_debug("ISO9660 VRS (%u) found\n",
 666                                           vsd->structType);
 667                                 break;
 668                         }
 669                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
 670                                     VSD_STD_ID_LEN))
 671                         ; /* nothing */
 672                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
 673                                     VSD_STD_ID_LEN)) {
 674                         brelse(bh);
 675                         break;
 676                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
 677                                     VSD_STD_ID_LEN))
 678                         nsr02 = sector;
 679                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
 680                                     VSD_STD_ID_LEN))
 681                         nsr03 = sector;
 682                 brelse(bh);
 683         }
 684
 685         if (nsr03)
 686                 return nsr03;
 687         else if (nsr02)
 688                 return nsr02;
 689         else if (sector - (sbi->s_session << sb->s_blocksize_bits) == 32768)
 690                 return -1;
 691         else
 692                 return 0;
 693 }
 694
 695 static int udf_find_fileset(struct super_block *sb,
 696                             struct kernel_lb_addr *fileset,
 697                             struct kernel_lb_addr *root)
 698 {
 699         struct buffer_head *bh = NULL;
 700         long lastblock;
 701         uint16_t ident;
 702         struct udf_sb_info *sbi;
 703
 704         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
 705             fileset->partitionReferenceNum != 0xFFFF) {
 706                 bh = udf_read_ptagged(sb, fileset, 0, &ident);
 707
 708                 if (!bh) {
 709                         return 1;
 710                 } else if (ident != TAG_IDENT_FSD) {
 711                         brelse(bh);
 712                         return 1;
 713                 }
 714
 715         }
 716
 717         sbi = UDF_SB(sb);
 718         if (!bh) {
 719                 /* Search backwards through the partitions */
 720                 struct kernel_lb_addr newfileset;
 721
 722 /* --> cvg: FIXME - is it reasonable? */
 723                 return 1;
 724
 725                 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
 726                      (newfileset.partitionReferenceNum != 0xFFFF &&
 727                       fileset->logicalBlockNum == 0xFFFFFFFF &&
 728                       fileset->partitionReferenceNum == 0xFFFF);
 729                      newfileset.partitionReferenceNum--) {
 730                         lastblock = sbi->s_partmaps
 731                                         [newfileset.partitionReferenceNum]
 732                                                 .s_partition_len;
 733                         newfileset.logicalBlockNum = 0;
 734
 735                         do {
 736                                 bh = udf_read_ptagged(sb, &newfileset, 0,
 737                                                       &ident);
 738                                 if (!bh) {
 739                                         newfileset.logicalBlockNum++;
 740                                         continue;
 741                                 }
 742
 743                                 switch (ident) {
 744                                 case TAG_IDENT_SBD:
 745                                 {
 746                                         struct spaceBitmapDesc *sp;
 747                                         sp = (struct spaceBitmapDesc *)
 748                                                                 bh->b_data;
 749                                         newfileset.logicalBlockNum += 1 +
 750                                                 ((le32_to_cpu(sp->numOfBytes) +
 751                                                   sizeof(struct spaceBitmapDesc)
 752                                                   - 1) >> sb->s_blocksize_bits);
 753                                         brelse(bh);
 754                                         break;
 755                                 }
 756                                 case TAG_IDENT_FSD:
 757                                         *fileset = newfileset;
 758                                         break;
 759                                 default:
 760                                         newfileset.logicalBlockNum++;
 761                                         brelse(bh);
 762                                         bh = NULL;
 763                                         break;
 764                                 }
 765                         } while (newfileset.logicalBlockNum < lastblock &&
 766                                  fileset->logicalBlockNum == 0xFFFFFFFF &&
 767                                  fileset->partitionReferenceNum == 0xFFFF);
 768                 }
 769         }
 770
 771         if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
 772              fileset->partitionReferenceNum != 0xFFFF) && bh) {
 773                 udf_debug("Fileset at block=%d, partition=%d\n",
 774                           fileset->logicalBlockNum,
 775                           fileset->partitionReferenceNum);
 776
 777                 sbi->s_partition = fileset->partitionReferenceNum;
 778                 udf_load_fileset(sb, bh, root);
 779                 brelse(bh);
 780                 return 0;
 781         }
 782         return 1;
 783 }
 784
 785 static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
 786 {
 787         struct primaryVolDesc *pvoldesc;
 788         struct ustr *instr, *outstr;
 789         struct buffer_head *bh;
 790         uint16_t ident;
 791         int ret = 1;
 792
 793         instr = kmalloc(sizeof(struct ustr), GFP_NOFS);
 794         if (!instr)
 795                 return 1;
 796
 797         outstr = kmalloc(sizeof(struct ustr), GFP_NOFS);
 798         if (!outstr)
 799                 goto out1;
 800
 801         bh = udf_read_tagged(sb, block, block, &ident);
 802         if (!bh)
 803                 goto out2;
 804
 805         BUG_ON(ident != TAG_IDENT_PVD);
 806
 807         pvoldesc = (struct primaryVolDesc *)bh->b_data;
 808
 809         if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
 810                               pvoldesc->recordingDateAndTime)) {
 811 #ifdef UDFFS_DEBUG
 812                 struct timestamp *ts = &pvoldesc->recordingDateAndTime;
 813                 udf_debug("recording time %04u/%02u/%02u"
 814                           " %02u:%02u (%x)\n",
 815                           le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
 816                           ts->minute, le16_to_cpu(ts->typeAndTimezone));
 817 #endif
 818         }
 819
 820         if (!udf_build_ustr(instr, pvoldesc->volIdent, 32))
 821                 if (udf_CS0toUTF8(outstr, instr)) {
 822                         strncpy(UDF_SB(sb)->s_volume_ident, outstr->u_name,
 823                                 outstr->u_len > 31 ? 31 : outstr->u_len);
 824                         udf_debug("volIdent[] = '%s'\n",
 825                                         UDF_SB(sb)->s_volume_ident);
 826                 }
 827
 828         if (!udf_build_ustr(instr, pvoldesc->volSetIdent, 128))
 829                 if (udf_CS0toUTF8(outstr, instr))
 830                         udf_debug("volSetIdent[] = '%s'\n", outstr->u_name);
 831
 832         brelse(bh);
 833         ret = 0;
 834 out2:
 835         kfree(outstr);
 836 out1:
 837         kfree(instr);
 838         return ret;
 839 }
 840
 841 static int udf_load_metadata_files(struct super_block *sb, int partition)
 842 {
 843         struct udf_sb_info *sbi = UDF_SB(sb);
 844         struct udf_part_map *map;
 845         struct udf_meta_data *mdata;
 846         struct kernel_lb_addr addr;
 847         int fe_error = 0;
 848
 849         map = &sbi->s_partmaps[partition];
 850         mdata = &map->s_type_specific.s_metadata;
 851
 852         /* metadata address */
 853         addr.logicalBlockNum =  mdata->s_meta_file_loc;
 854         addr.partitionReferenceNum = map->s_partition_num;
 855
 856         udf_debug("Metadata file location: block = %d part = %d\n",
 857                           addr.logicalBlockNum, addr.partitionReferenceNum);
 858
 859         mdata->s_metadata_fe = udf_iget(sb, &addr);
 860
 861         if (mdata->s_metadata_fe == NULL) {
 862                 udf_warning(sb, __func__, "metadata inode efe not found, "
 863                                 "will try mirror inode.");
 864                 fe_error = 1;
 865         } else if (UDF_I(mdata->s_metadata_fe)->i_alloc_type !=
 866                  ICBTAG_FLAG_AD_SHORT) {
 867                 udf_warning(sb, __func__, "metadata inode efe does not have "
 868                         "short allocation descriptors!");
 869                 fe_error = 1;
 870                 iput(mdata->s_metadata_fe);
 871                 mdata->s_metadata_fe = NULL;
 872         }
 873
 874         /* mirror file entry */
 875         addr.logicalBlockNum = mdata->s_mirror_file_loc;
 876         addr.partitionReferenceNum = map->s_partition_num;
 877
 878         udf_debug("Mirror metadata file location: block = %d part = %d\n",
 879                           addr.logicalBlockNum, addr.partitionReferenceNum);
 880
 881         mdata->s_mirror_fe = udf_iget(sb, &addr);
 882
 883         if (mdata->s_mirror_fe == NULL) {
 884                 if (fe_error) {
 885                         udf_error(sb, __func__, "mirror inode efe not found "
 886                         "and metadata inode is missing too, exiting...");
 887                         goto error_exit;
 888                 } else
 889                         udf_warning(sb, __func__, "mirror inode efe not found,"
 890                                         " but metadata inode is OK");
 891         } else if (UDF_I(mdata->s_mirror_fe)->i_alloc_type !=
 892                  ICBTAG_FLAG_AD_SHORT) {
 893                 udf_warning(sb, __func__, "mirror inode efe does not have "
 894                         "short allocation descriptors!");
 895                 iput(mdata->s_mirror_fe);
 896                 mdata->s_mirror_fe = NULL;
 897                 if (fe_error)
 898                         goto error_exit;
 899         }
 900
 901         /*
 902          * bitmap file entry
 903          * Note:
 904          * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
 905         */
 906         if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
 907                 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
 908                 addr.partitionReferenceNum = map->s_partition_num;
 909
 910                 udf_debug("Bitmap file location: block = %d part = %d\n",
 911                         addr.logicalBlockNum, addr.partitionReferenceNum);
 912
 913                 mdata->s_bitmap_fe = udf_iget(sb, &addr);
 914
 915                 if (mdata->s_bitmap_fe == NULL) {
 916                         if (sb->s_flags & MS_RDONLY)
 917                                 udf_warning(sb, __func__, "bitmap inode efe "
 918                                         "not found but it's ok since the disc"
 919                                         " is mounted read-only");
 920                         else {
 921                                 udf_error(sb, __func__, "bitmap inode efe not "
 922                                         "found and attempted read-write mount");
 923                                 goto error_exit;
 924                         }
 925                 }
 926         }
 927
 928         udf_debug("udf_load_metadata_files Ok\n");
 929
 930         return 0;
 931
 932 error_exit:
 933         return 1;
 934 }
 935
 936 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
 937                              struct kernel_lb_addr *root)
 938 {
 939         struct fileSetDesc *fset;
 940
 941         fset = (struct fileSetDesc *)bh->b_data;
 942
 943         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
 944
 945         UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
 946
 947         udf_debug("Rootdir at block=%d, partition=%d\n",
 948                   root->logicalBlockNum, root->partitionReferenceNum);
 949 }
 950
 951 int udf_compute_nr_groups(struct super_block *sb, u32 partition)
 952 {
 953         struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
 954         return DIV_ROUND_UP(map->s_partition_len +
 955                             (sizeof(struct spaceBitmapDesc) << 3),
 956                             sb->s_blocksize * 8);
 957 }
 958
 959 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
 960 {
 961         struct udf_bitmap *bitmap;
 962         int nr_groups;
 963         int size;
 964
 965         nr_groups = udf_compute_nr_groups(sb, index);
 966         size = sizeof(struct udf_bitmap) +
 967                 (sizeof(struct buffer_head *) * nr_groups);
 968
 969         if (size <= PAGE_SIZE)
 970                 bitmap = kmalloc(size, GFP_KERNEL);
 971         else
 972                 bitmap = vmalloc(size); /* TODO: get rid of vmalloc */
 973
 974         if (bitmap == NULL) {
 975                 udf_error(sb, __func__,
 976                           "Unable to allocate space for bitmap "
 977                           "and %d buffer_head pointers", nr_groups);
 978                 return NULL;
 979         }
 980
 981         memset(bitmap, 0x00, size);
 982         bitmap->s_block_bitmap = (struct buffer_head **)(bitmap + 1);
 983         bitmap->s_nr_groups = nr_groups;
 984         return bitmap;
 985 }
 986
 987 static int udf_fill_partdesc_info(struct super_block *sb,
 988                 struct partitionDesc *p, int p_index)
 989 {
 990         struct udf_part_map *map;
 991         struct udf_sb_info *sbi = UDF_SB(sb);
 992         struct partitionHeaderDesc *phd;
 993
 994         map = &sbi->s_partmaps[p_index];
 995
 996         map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
 997         map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
 998
 999         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
1000                 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
1001         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
1002                 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
1003         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
1004                 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
1005         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
1006                 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
1007
1008         udf_debug("Partition (%d type %x) starts at physical %d, "
1009                   "block length %d\n", p_index,
1010                   map->s_partition_type, map->s_partition_root,
1011                   map->s_partition_len);
1012
1013         if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1014             strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
1015                 return 0;
1016
1017         phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1018         if (phd->unallocSpaceTable.extLength) {
1019                 struct kernel_lb_addr loc = {
1020                         .logicalBlockNum = le32_to_cpu(
1021                                 phd->unallocSpaceTable.extPosition),
1022                         .partitionReferenceNum = p_index,
1023                 };
1024
1025                 map->s_uspace.s_table = udf_iget(sb, &loc);
1026                 if (!map->s_uspace.s_table) {
1027                         udf_debug("cannot load unallocSpaceTable (part %d)\n",
1028                                         p_index);
1029                         return 1;
1030                 }
1031                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1032                 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
1033                                 p_index, map->s_uspace.s_table->i_ino);
1034         }
1035
1036         if (phd->unallocSpaceBitmap.extLength) {
1037                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1038                 if (!bitmap)
1039                         return 1;
1040                 map->s_uspace.s_bitmap = bitmap;
1041                 bitmap->s_extLength = le32_to_cpu(
1042                                 phd->unallocSpaceBitmap.extLength);
1043                 bitmap->s_extPosition = le32_to_cpu(
1044                                 phd->unallocSpaceBitmap.extPosition);
1045                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1046                 udf_debug("unallocSpaceBitmap (part %d) @ %d\n", p_index,
1047                                                 bitmap->s_extPosition);
1048         }
1049
1050         if (phd->partitionIntegrityTable.extLength)
1051                 udf_debug("partitionIntegrityTable (part %d)\n", p_index);
1052
1053         if (phd->freedSpaceTable.extLength) {
1054                 struct kernel_lb_addr loc = {
1055                         .logicalBlockNum = le32_to_cpu(
1056                                 phd->freedSpaceTable.extPosition),
1057                         .partitionReferenceNum = p_index,
1058                 };
1059
1060                 map->s_fspace.s_table = udf_iget(sb, &loc);
1061                 if (!map->s_fspace.s_table) {
1062                         udf_debug("cannot load freedSpaceTable (part %d)\n",
1063                                 p_index);
1064                         return 1;
1065                 }
1066
1067                 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
1068                 udf_debug("freedSpaceTable (part %d) @ %ld\n",
1069                                 p_index, map->s_fspace.s_table->i_ino);
1070         }
1071
1072         if (phd->freedSpaceBitmap.extLength) {
1073                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1074                 if (!bitmap)
1075                         return 1;
1076                 map->s_fspace.s_bitmap = bitmap;
1077                 bitmap->s_extLength = le32_to_cpu(
1078                                 phd->freedSpaceBitmap.extLength);
1079                 bitmap->s_extPosition = le32_to_cpu(
1080                                 phd->freedSpaceBitmap.extPosition);
1081                 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1082                 udf_debug("freedSpaceBitmap (part %d) @ %d\n", p_index,
1083                                         bitmap->s_extPosition);
1084         }
1085         return 0;
1086 }
1087
1088 static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1089 {
1090         struct udf_sb_info *sbi = UDF_SB(sb);
1091         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1092         struct kernel_lb_addr ino;
1093         struct buffer_head *bh = NULL;
1094         struct udf_inode_info *vati;
1095         uint32_t pos;
1096         struct virtualAllocationTable20 *vat20;
1097
1098         /* VAT file entry is in the last recorded block */
1099         ino.partitionReferenceNum = type1_index;
1100         ino.logicalBlockNum = sbi->s_last_block - map->s_partition_root;
1101         sbi->s_vat_inode = udf_iget(sb, &ino);
1102         if (!sbi->s_vat_inode)
1103                 return 1;
1104
1105         if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1106                 map->s_type_specific.s_virtual.s_start_offset = 0;
1107                 map->s_type_specific.s_virtual.s_num_entries =
1108                         (sbi->s_vat_inode->i_size - 36) >> 2;
1109         } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1110                 vati = UDF_I(sbi->s_vat_inode);
1111                 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1112                         pos = udf_block_map(sbi->s_vat_inode, 0);
1113                         bh = sb_bread(sb, pos);
1114                         if (!bh)
1115                                 return 1;
1116                         vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1117                 } else {
1118                         vat20 = (struct virtualAllocationTable20 *)
1119                                                         vati->i_ext.i_data;
1120                 }
1121
1122                 map->s_type_specific.s_virtual.s_start_offset =
1123                         le16_to_cpu(vat20->lengthHeader);
1124                 map->s_type_specific.s_virtual.s_num_entries =
1125                         (sbi->s_vat_inode->i_size -
1126                                 map->s_type_specific.s_virtual.
1127                                         s_start_offset) >> 2;
1128                 brelse(bh);
1129         }
1130         return 0;
1131 }
1132
1133 static int udf_load_partdesc(struct super_block *sb, sector_t block)
1134 {
1135         struct buffer_head *bh;
1136         struct partitionDesc *p;
1137         struct udf_part_map *map;
1138         struct udf_sb_info *sbi = UDF_SB(sb);
1139         int i, type1_idx;
1140         uint16_t partitionNumber;
1141         uint16_t ident;
1142         int ret = 0;
1143
1144         bh = udf_read_tagged(sb, block, block, &ident);
1145         if (!bh)
1146                 return 1;
1147         if (ident != TAG_IDENT_PD)
1148                 goto out_bh;
1149
1150         p = (struct partitionDesc *)bh->b_data;
1151         partitionNumber = le16_to_cpu(p->partitionNumber);
1152
1153         /* First scan for TYPE1, SPARABLE and METADATA partitions */
1154         for (i = 0; i < sbi->s_partitions; i++) {
1155                 map = &sbi->s_partmaps[i];
1156                 udf_debug("Searching map: (%d == %d)\n",
1157                           map->s_partition_num, partitionNumber);
1158                 if (map->s_partition_num == partitionNumber &&
1159                     (map->s_partition_type == UDF_TYPE1_MAP15 ||
1160                      map->s_partition_type == UDF_SPARABLE_MAP15))
1161                         break;
1162         }
1163
1164         if (i >= sbi->s_partitions) {
1165                 udf_debug("Partition (%d) not found in partition map\n",
1166                           partitionNumber);
1167                 goto out_bh;
1168         }
1169
1170         ret = udf_fill_partdesc_info(sb, p, i);
1171
1172         /*
1173          * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1174          * PHYSICAL partitions are already set up
1175          */
1176         type1_idx = i;
1177         for (i = 0; i < sbi->s_partitions; i++) {
1178                 map = &sbi->s_partmaps[i];
1179
1180                 if (map->s_partition_num == partitionNumber &&
1181                     (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1182                      map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1183                      map->s_partition_type == UDF_METADATA_MAP25))
1184                         break;
1185         }
1186
1187         if (i >= sbi->s_partitions)
1188                 goto out_bh;
1189
1190         ret = udf_fill_partdesc_info(sb, p, i);
1191         if (ret)
1192                 goto out_bh;
1193
1194         if (map->s_partition_type == UDF_METADATA_MAP25) {
1195                 ret = udf_load_metadata_files(sb, i);
1196                 if (ret) {
1197                         printk(KERN_ERR "UDF-fs: error loading MetaData "
1198                         "partition map %d\n", i);
1199                         goto out_bh;
1200                 }
1201         } else {
1202                 ret = udf_load_vat(sb, i, type1_idx);
1203                 if (ret)
1204                         goto out_bh;
1205                 /*
1206                  * Mark filesystem read-only if we have a partition with
1207                  * virtual map since we don't handle writing to it (we
1208                  * overwrite blocks instead of relocating them).
1209                  */
1210                 sb->s_flags |= MS_RDONLY;
1211                 printk(KERN_NOTICE "UDF-fs: Filesystem marked read-only "
1212                         "because writing to pseudooverwrite partition is "
1213                         "not implemented.\n");
1214         }
1215 out_bh:
1216         /* In case loading failed, we handle cleanup in udf_fill_super */
1217         brelse(bh);
1218         return ret;
1219 }
1220
1221 static int udf_load_logicalvol(struct super_block *sb, sector_t block,
1222                                struct kernel_lb_addr *fileset)
1223 {
1224         struct logicalVolDesc *lvd;
1225         int i, j, offset;
1226         uint8_t type;
1227         struct udf_sb_info *sbi = UDF_SB(sb);
1228         struct genericPartitionMap *gpm;
1229         uint16_t ident;
1230         struct buffer_head *bh;
1231         int ret = 0;
1232
1233         bh = udf_read_tagged(sb, block, block, &ident);
1234         if (!bh)
1235                 return 1;
1236         BUG_ON(ident != TAG_IDENT_LVD);
1237         lvd = (struct logicalVolDesc *)bh->b_data;
1238
1239         i = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1240         if (i != 0) {
1241                 ret = i;
1242                 goto out_bh;
1243         }
1244
1245         for (i = 0, offset = 0;
1246              i < sbi->s_partitions && offset < le32_to_cpu(lvd->mapTableLength);
1247              i++, offset += gpm->partitionMapLength) {
1248                 struct udf_part_map *map = &sbi->s_partmaps[i];
1249                 gpm = (struct genericPartitionMap *)
1250                                 &(lvd->partitionMaps[offset]);
1251                 type = gpm->partitionMapType;
1252                 if (type == 1) {
1253                         struct genericPartitionMap1 *gpm1 =
1254                                 (struct genericPartitionMap1 *)gpm;
1255                         map->s_partition_type = UDF_TYPE1_MAP15;
1256                         map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1257                         map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1258                         map->s_partition_func = NULL;
1259                 } else if (type == 2) {
1260                         struct udfPartitionMap2 *upm2 =
1261                                                 (struct udfPartitionMap2 *)gpm;
1262                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1263                                                 strlen(UDF_ID_VIRTUAL))) {
1264                                 u16 suf =
1265                                         le16_to_cpu(((__le16 *)upm2->partIdent.
1266                                                         identSuffix)[0]);
1267                                 if (suf < 0x0200) {
1268                                         map->s_partition_type =
1269                                                         UDF_VIRTUAL_MAP15;
1270                                         map->s_partition_func =
1271                                                         udf_get_pblock_virt15;
1272                                 } else {
1273                                         map->s_partition_type =
1274                                                         UDF_VIRTUAL_MAP20;
1275                                         map->s_partition_func =
1276                                                         udf_get_pblock_virt20;
1277                                 }
1278                         } else if (!strncmp(upm2->partIdent.ident,
1279                                                 UDF_ID_SPARABLE,
1280                                                 strlen(UDF_ID_SPARABLE))) {
1281                                 uint32_t loc;
1282                                 struct sparingTable *st;
1283                                 struct sparablePartitionMap *spm =
1284                                         (struct sparablePartitionMap *)gpm;
1285
1286                                 map->s_partition_type = UDF_SPARABLE_MAP15;
1287                                 map->s_type_specific.s_sparing.s_packet_len =
1288                                                 le16_to_cpu(spm->packetLength);
1289                                 for (j = 0; j < spm->numSparingTables; j++) {
1290                                         struct buffer_head *bh2;
1291
1292                                         loc = le32_to_cpu(
1293                                                 spm->locSparingTable[j]);
1294                                         bh2 = udf_read_tagged(sb, loc, loc,
1295                                                              &ident);
1296                                         map->s_type_specific.s_sparing.
1297                                                         s_spar_map[j] = bh2;
1298
1299                                         if (bh2 == NULL)
1300                                                 continue;
1301
1302                                         st = (struct sparingTable *)bh2->b_data;
1303                                         if (ident != 0 || strncmp(
1304                                                 st->sparingIdent.ident,
1305                                                 UDF_ID_SPARING,
1306                                                 strlen(UDF_ID_SPARING))) {
1307                                                 brelse(bh2);
1308                                                 map->s_type_specific.s_sparing.
1309                                                         s_spar_map[j] = NULL;
1310                                         }
1311                                 }
1312                                 map->s_partition_func = udf_get_pblock_spar15;
1313                         } else if (!strncmp(upm2->partIdent.ident,
1314                                                 UDF_ID_METADATA,
1315                                                 strlen(UDF_ID_METADATA))) {
1316                                 struct udf_meta_data *mdata =
1317                                         &map->s_type_specific.s_metadata;
1318                                 struct metadataPartitionMap *mdm =
1319                                                 (struct metadataPartitionMap *)
1320                                                 &(lvd->partitionMaps[offset]);
1321                                 udf_debug("Parsing Logical vol part %d "
1322                                         "type %d  id=%s\n", i, type,
1323                                         UDF_ID_METADATA);
1324
1325                                 map->s_partition_type = UDF_METADATA_MAP25;
1326                                 map->s_partition_func = udf_get_pblock_meta25;
1327
1328                                 mdata->s_meta_file_loc   =
1329                                         le32_to_cpu(mdm->metadataFileLoc);
1330                                 mdata->s_mirror_file_loc =
1331                                         le32_to_cpu(mdm->metadataMirrorFileLoc);
1332                                 mdata->s_bitmap_file_loc =
1333                                         le32_to_cpu(mdm->metadataBitmapFileLoc);
1334                                 mdata->s_alloc_unit_size =
1335                                         le32_to_cpu(mdm->allocUnitSize);
1336                                 mdata->s_align_unit_size =
1337                                         le16_to_cpu(mdm->alignUnitSize);
1338                                 mdata->s_dup_md_flag     =
1339                                         mdm->flags & 0x01;
1340
1341                                 udf_debug("Metadata Ident suffix=0x%x\n",
1342                                         (le16_to_cpu(
1343                                          ((__le16 *)
1344                                               mdm->partIdent.identSuffix)[0])));
1345                                 udf_debug("Metadata part num=%d\n",
1346                                         le16_to_cpu(mdm->partitionNum));
1347                                 udf_debug("Metadata part alloc unit size=%d\n",
1348                                         le32_to_cpu(mdm->allocUnitSize));
1349                                 udf_debug("Metadata file loc=%d\n",
1350                                         le32_to_cpu(mdm->metadataFileLoc));
1351                                 udf_debug("Mirror file loc=%d\n",
1352                                        le32_to_cpu(mdm->metadataMirrorFileLoc));
1353                                 udf_debug("Bitmap file loc=%d\n",
1354                                        le32_to_cpu(mdm->metadataBitmapFileLoc));
1355                                 udf_debug("Duplicate Flag: %d %d\n",
1356                                         mdata->s_dup_md_flag, mdm->flags);
1357                         } else {
1358                                 udf_debug("Unknown ident: %s\n",
1359                                           upm2->partIdent.ident);
1360                                 continue;
1361                         }
1362                         map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1363                         map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1364                 }
1365                 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1366                           i, map->s_partition_num, type,
1367                           map->s_volumeseqnum);
1368         }
1369
1370         if (fileset) {
1371                 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
1372
1373                 *fileset = lelb_to_cpu(la->extLocation);
1374                 udf_debug("FileSet found in LogicalVolDesc at block=%d, "
1375                           "partition=%d\n", fileset->logicalBlockNum,
1376                           fileset->partitionReferenceNum);
1377         }
1378         if (lvd->integritySeqExt.extLength)
1379                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1380
1381 out_bh:
1382         brelse(bh);
1383         return ret;
1384 }
1385
1386 /*
1387  * udf_load_logicalvolint
1388  *
1389  */
1390 static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
1391 {
1392         struct buffer_head *bh = NULL;
1393         uint16_t ident;
1394         struct udf_sb_info *sbi = UDF_SB(sb);
1395         struct logicalVolIntegrityDesc *lvid;
1396
1397         while (loc.extLength > 0 &&
1398                (bh = udf_read_tagged(sb, loc.extLocation,
1399                                      loc.extLocation, &ident)) &&
1400                ident == TAG_IDENT_LVID) {
1401                 sbi->s_lvid_bh = bh;
1402                 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1403
1404                 if (lvid->nextIntegrityExt.extLength)
1405                         udf_load_logicalvolint(sb,
1406                                 leea_to_cpu(lvid->nextIntegrityExt));
1407
1408                 if (sbi->s_lvid_bh != bh)
1409                         brelse(bh);
1410                 loc.extLength -= sb->s_blocksize;
1411                 loc.extLocation++;
1412         }
1413         if (sbi->s_lvid_bh != bh)
1414                 brelse(bh);
1415 }
1416
1417 /*
1418  * udf_process_sequence
1419  *
1420  * PURPOSE
1421  *      Process a main/reserve volume descriptor sequence.
1422  *
1423  * PRE-CONDITIONS
1424  *      sb                      Pointer to _locked_ superblock.
1425  *      block                   First block of first extent of the sequence.
1426  *      lastblock               Lastblock of first extent of the sequence.
1427  *
1428  * HISTORY
1429  *      July 1, 1997 - Andrew E. Mileski
1430  *      Written, tested, and released.
1431  */
1432 static noinline int udf_process_sequence(struct super_block *sb, long block,
1433                                 long lastblock, struct kernel_lb_addr *fileset)
1434 {
1435         struct buffer_head *bh = NULL;
1436         struct udf_vds_record vds[VDS_POS_LENGTH];
1437         struct udf_vds_record *curr;
1438         struct generic_desc *gd;
1439         struct volDescPtr *vdp;
1440         int done = 0;
1441         uint32_t vdsn;
1442         uint16_t ident;
1443         long next_s = 0, next_e = 0;
1444
1445         memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1446
1447         /*
1448          * Read the main descriptor sequence and find which descriptors
1449          * are in it.
1450          */
1451         for (; (!done && block <= lastblock); block++) {
1452
1453                 bh = udf_read_tagged(sb, block, block, &ident);
1454                 if (!bh) {
1455                         printk(KERN_ERR "udf: Block %Lu of volume descriptor "
1456                                "sequence is corrupted or we could not read "
1457                                "it.\n", (unsigned long long)block);
1458                         return 1;
1459                 }
1460
1461                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1462                 gd = (struct generic_desc *)bh->b_data;
1463                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1464                 switch (ident) {
1465                 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1466                         curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1467                         if (vdsn >= curr->volDescSeqNum) {
1468                                 curr->volDescSeqNum = vdsn;
1469                                 curr->block = block;
1470                         }
1471                         break;
1472                 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1473                         curr = &vds[VDS_POS_VOL_DESC_PTR];
1474                         if (vdsn >= curr->volDescSeqNum) {
1475                                 curr->volDescSeqNum = vdsn;
1476                                 curr->block = block;
1477
1478                                 vdp = (struct volDescPtr *)bh->b_data;
1479                                 next_s = le32_to_cpu(
1480                                         vdp->nextVolDescSeqExt.extLocation);
1481                                 next_e = le32_to_cpu(
1482                                         vdp->nextVolDescSeqExt.extLength);
1483                                 next_e = next_e >> sb->s_blocksize_bits;
1484                                 next_e += next_s;
1485                         }
1486                         break;
1487                 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1488                         curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1489                         if (vdsn >= curr->volDescSeqNum) {
1490                                 curr->volDescSeqNum = vdsn;
1491                                 curr->block = block;
1492                         }
1493                         break;
1494                 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1495                         curr = &vds[VDS_POS_PARTITION_DESC];
1496                         if (!curr->block)
1497                                 curr->block = block;
1498                         break;
1499                 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1500                         curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1501                         if (vdsn >= curr->volDescSeqNum) {
1502                                 curr->volDescSeqNum = vdsn;
1503                                 curr->block = block;
1504                         }
1505                         break;
1506                 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1507                         curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1508                         if (vdsn >= curr->volDescSeqNum) {
1509                                 curr->volDescSeqNum = vdsn;
1510                                 curr->block = block;
1511                         }
1512                         break;
1513                 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1514                         vds[VDS_POS_TERMINATING_DESC].block = block;
1515                         if (next_e) {
1516                                 block = next_s;
1517                                 lastblock = next_e;
1518                                 next_s = next_e = 0;
1519                         } else
1520                                 done = 1;
1521                         break;
1522                 }
1523                 brelse(bh);
1524         }
1525         /*
1526          * Now read interesting descriptors again and process them
1527          * in a suitable order
1528          */
1529         if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1530                 printk(KERN_ERR "udf: Primary Volume Descriptor not found!\n");
1531                 return 1;
1532         }
1533         if (udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block))
1534                 return 1;
1535
1536         if (vds[VDS_POS_LOGICAL_VOL_DESC].block && udf_load_logicalvol(sb,
1537             vds[VDS_POS_LOGICAL_VOL_DESC].block, fileset))
1538                 return 1;
1539
1540         if (vds[VDS_POS_PARTITION_DESC].block) {
1541                 /*
1542                  * We rescan the whole descriptor sequence to find
1543                  * partition descriptor blocks and process them.
1544                  */
1545                 for (block = vds[VDS_POS_PARTITION_DESC].block;
1546                      block < vds[VDS_POS_TERMINATING_DESC].block;
1547                      block++)
1548                         if (udf_load_partdesc(sb, block))
1549                                 return 1;
1550         }
1551
1552         return 0;
1553 }
1554
1555 static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh,
1556                              struct kernel_lb_addr *fileset)
1557 {
1558         struct anchorVolDescPtr *anchor;
1559         long main_s, main_e, reserve_s, reserve_e;
1560         struct udf_sb_info *sbi;
1561
1562         sbi = UDF_SB(sb);
1563         anchor = (struct anchorVolDescPtr *)bh->b_data;
1564
1565         /* Locate the main sequence */
1566         main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1567         main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1568         main_e = main_e >> sb->s_blocksize_bits;
1569         main_e += main_s;
1570
1571         /* Locate the reserve sequence */
1572         reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1573         reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1574         reserve_e = reserve_e >> sb->s_blocksize_bits;
1575         reserve_e += reserve_s;
1576
1577         /* Process the main & reserve sequences */
1578         /* responsible for finding the PartitionDesc(s) */
1579         if (!udf_process_sequence(sb, main_s, main_e, fileset))
1580                 return 1;
1581         return !udf_process_sequence(sb, reserve_s, reserve_e, fileset);
1582 }
1583
1584 /*
1585  * Check whether there is an anchor block in the given block and
1586  * load Volume Descriptor Sequence if so.
1587  */
1588 static int udf_check_anchor_block(struct super_block *sb, sector_t block,
1589                                   struct kernel_lb_addr *fileset)
1590 {
1591         struct buffer_head *bh;
1592         uint16_t ident;
1593         int ret;
1594
1595         if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
1596             udf_fixed_to_variable(block) >=
1597             sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits)
1598                 return 0;
1599
1600         bh = udf_read_tagged(sb, block, block, &ident);
1601         if (!bh)
1602                 return 0;
1603         if (ident != TAG_IDENT_AVDP) {
1604                 brelse(bh);
1605                 return 0;
1606         }
1607         ret = udf_load_sequence(sb, bh, fileset);
1608         brelse(bh);
1609         return ret;
1610 }
1611
1612 /* Search for an anchor volume descriptor pointer */
1613 static sector_t udf_scan_anchors(struct super_block *sb, sector_t lastblock,
1614                                  struct kernel_lb_addr *fileset)
1615 {
1616         sector_t last[6];
1617         int i;
1618         struct udf_sb_info *sbi = UDF_SB(sb);
1619         int last_count = 0;
1620
1621         /* First try user provided anchor */
1622         if (sbi->s_anchor) {
1623                 if (udf_check_anchor_block(sb, sbi->s_anchor, fileset))
1624                         return lastblock;
1625         }
1626         /*
1627          * according to spec, anchor is in either:
1628          *     block 256
1629          *     lastblock-256
1630          *     lastblock
1631          *  however, if the disc isn't closed, it could be 512.
1632          */
1633         if (udf_check_anchor_block(sb, sbi->s_session + 256, fileset))
1634                 return lastblock;
1635         /*
1636          * The trouble is which block is the last one. Drives often misreport
1637          * this so we try various possibilities.
1638          */
1639         last[last_count++] = lastblock;
1640         if (lastblock >= 1)
1641                 last[last_count++] = lastblock - 1;
1642         last[last_count++] = lastblock + 1;
1643         if (lastblock >= 2)
1644                 last[last_count++] = lastblock - 2;
1645         if (lastblock >= 150)
1646                 last[last_count++] = lastblock - 150;
1647         if (lastblock >= 152)
1648                 last[last_count++] = lastblock - 152;
1649
1650         for (i = 0; i < last_count; i++) {
1651                 if (last[i] >= sb->s_bdev->bd_inode->i_size >>
1652                                 sb->s_blocksize_bits)
1653                         continue;
1654                 if (udf_check_anchor_block(sb, last[i], fileset))
1655                         return last[i];
1656                 if (last[i] < 256)
1657                         continue;
1658                 if (udf_check_anchor_block(sb, last[i] - 256, fileset))
1659                         return last[i];
1660         }
1661
1662         /* Finally try block 512 in case media is open */
1663         if (udf_check_anchor_block(sb, sbi->s_session + 512, fileset))
1664                 return last[0];
1665         return 0;
1666 }
1667
1668 /*
1669  * Find an anchor volume descriptor and load Volume Descriptor Sequence from
1670  * area specified by it. The function expects sbi->s_lastblock to be the last
1671  * block on the media.
1672  *
1673  * Return 1 if ok, 0 if not found.
1674  *
1675  */
1676 static int udf_find_anchor(struct super_block *sb,
1677                            struct kernel_lb_addr *fileset)
1678 {
1679         sector_t lastblock;
1680         struct udf_sb_info *sbi = UDF_SB(sb);
1681
1682         lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1683         if (lastblock)
1684                 goto out;
1685
1686         /* No anchor found? Try VARCONV conversion of block numbers */
1687         UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
1688         /* Firstly, we try to not convert number of the last block */
1689         lastblock = udf_scan_anchors(sb,
1690                                 udf_variable_to_fixed(sbi->s_last_block),
1691                                 fileset);
1692         if (lastblock)
1693                 goto out;
1694
1695         /* Secondly, we try with converted number of the last block */
1696         lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1697         if (!lastblock) {
1698                 /* VARCONV didn't help. Clear it. */
1699                 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
1700                 return 0;
1701         }
1702 out:
1703         sbi->s_last_block = lastblock;
1704         return 1;
1705 }
1706
1707 /*
1708  * Check Volume Structure Descriptor, find Anchor block and load Volume
1709  * Descriptor Sequence
1710  */
1711 static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
1712                         int silent, struct kernel_lb_addr *fileset)
1713 {
1714         struct udf_sb_info *sbi = UDF_SB(sb);
1715         loff_t nsr_off;
1716
1717         if (!sb_set_blocksize(sb, uopt->blocksize)) {
1718                 if (!silent)
1719                         printk(KERN_WARNING "UDF-fs: Bad block size\n");
1720                 return 0;
1721         }
1722         sbi->s_last_block = uopt->lastblock;
1723         if (!uopt->novrs) {
1724                 /* Check that it is NSR02 compliant */
1725                 nsr_off = udf_check_vsd(sb);
1726                 if (!nsr_off) {
1727                         if (!silent)
1728                                 printk(KERN_WARNING "UDF-fs: No VRS found\n");
1729                         return 0;
1730                 }
1731                 if (nsr_off == -1)
1732                         udf_debug("Failed to read byte 32768. Assuming open "
1733                                   "disc. Skipping validity check\n");
1734                 if (!sbi->s_last_block)
1735                         sbi->s_last_block = udf_get_last_block(sb);
1736         } else {
1737                 udf_debug("Validity check skipped because of novrs option\n");
1738         }
1739
1740         /* Look for anchor block and load Volume Descriptor Sequence */
1741         sbi->s_anchor = uopt->anchor;
1742         if (!udf_find_anchor(sb, fileset)) {
1743                 if (!silent)
1744                         printk(KERN_WARNING "UDF-fs: No anchor found\n");
1745                 return 0;
1746         }
1747         return 1;
1748 }
1749
1750 static void udf_open_lvid(struct super_block *sb)
1751 {
1752         struct udf_sb_info *sbi = UDF_SB(sb);
1753         struct buffer_head *bh = sbi->s_lvid_bh;
1754         struct logicalVolIntegrityDesc *lvid;
1755         struct logicalVolIntegrityDescImpUse *lvidiu;
1756         if (!bh)
1757                 return;
1758
1759         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1760         lvidiu = udf_sb_lvidiu(sbi);
1761
1762         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1763         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1764         udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
1765                                 CURRENT_TIME);
1766         lvid->integrityType = LVID_INTEGRITY_TYPE_OPEN;
1767
1768         lvid->descTag.descCRC = cpu_to_le16(
1769                 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1770                         le16_to_cpu(lvid->descTag.descCRCLength)));
1771
1772         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1773         mark_buffer_dirty(bh);
1774 }
1775
1776 static void udf_close_lvid(struct super_block *sb)
1777 {
1778         struct udf_sb_info *sbi = UDF_SB(sb);
1779         struct buffer_head *bh = sbi->s_lvid_bh;
1780         struct logicalVolIntegrityDesc *lvid;
1781         struct logicalVolIntegrityDescImpUse *lvidiu;
1782
1783         if (!bh)
1784                 return;
1785
1786         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1787
1788         if (lvid->integrityType != LVID_INTEGRITY_TYPE_OPEN)
1789                 return;
1790
1791         lvidiu = udf_sb_lvidiu(sbi);
1792         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1793         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1794         udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
1795         if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1796                 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1797         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1798                 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1799         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
1800                 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
1801         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1802
1803         lvid->descTag.descCRC = cpu_to_le16(
1804                         crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1805                                 le16_to_cpu(lvid->descTag.descCRCLength)));
1806
1807         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1808         mark_buffer_dirty(bh);
1809 }
1810
1811 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
1812 {
1813         int i;
1814         int nr_groups = bitmap->s_nr_groups;
1815         int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
1816                                                 nr_groups);
1817
1818         for (i = 0; i < nr_groups; i++)
1819                 if (bitmap->s_block_bitmap[i])
1820                         brelse(bitmap->s_block_bitmap[i]);
1821
1822         if (size <= PAGE_SIZE)
1823                 kfree(bitmap);
1824         else
1825                 vfree(bitmap);
1826 }
1827
1828 static void udf_free_partition(struct udf_part_map *map)
1829 {
1830         int i;
1831         struct udf_meta_data *mdata;
1832
1833         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1834                 iput(map->s_uspace.s_table);
1835         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1836                 iput(map->s_fspace.s_table);
1837         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1838                 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
1839         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1840                 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
1841         if (map->s_partition_type == UDF_SPARABLE_MAP15)
1842                 for (i = 0; i < 4; i++)
1843                         brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
1844         else if (map->s_partition_type == UDF_METADATA_MAP25) {
1845                 mdata = &map->s_type_specific.s_metadata;
1846                 iput(mdata->s_metadata_fe);
1847                 mdata->s_metadata_fe = NULL;
1848
1849                 iput(mdata->s_mirror_fe);
1850                 mdata->s_mirror_fe = NULL;
1851
1852                 iput(mdata->s_bitmap_fe);
1853                 mdata->s_bitmap_fe = NULL;
1854         }
1855 }
1856
1857 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1858 {
1859         int i;
1860         int ret;
1861         struct inode *inode = NULL;
1862         struct udf_options uopt;
1863         struct kernel_lb_addr rootdir, fileset;
1864         struct udf_sb_info *sbi;
1865
1866         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1867         uopt.uid = -1;
1868         uopt.gid = -1;
1869         uopt.umask = 0;
1870         uopt.fmode = UDF_INVALID_MODE;
1871         uopt.dmode = UDF_INVALID_MODE;
1872
1873         sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1874         if (!sbi)
1875                 return -ENOMEM;
1876
1877         sb->s_fs_info = sbi;
1878
1879         mutex_init(&sbi->s_alloc_mutex);
1880
1881         if (!udf_parse_options((char *)options, &uopt, false))
1882                 goto error_out;
1883
1884         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1885             uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
1886                 udf_error(sb, "udf_read_super",
1887                           "utf8 cannot be combined with iocharset\n");
1888                 goto error_out;
1889         }
1890 #ifdef CONFIG_UDF_NLS
1891         if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1892                 uopt.nls_map = load_nls_default();
1893                 if (!uopt.nls_map)
1894                         uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1895                 else
1896                         udf_debug("Using default NLS map\n");
1897         }
1898 #endif
1899         if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1900                 uopt.flags |= (1 << UDF_FLAG_UTF8);
1901
1902         fileset.logicalBlockNum = 0xFFFFFFFF;
1903         fileset.partitionReferenceNum = 0xFFFF;
1904
1905         sbi->s_flags = uopt.flags;
1906         sbi->s_uid = uopt.uid;
1907         sbi->s_gid = uopt.gid;
1908         sbi->s_umask = uopt.umask;
1909         sbi->s_fmode = uopt.fmode;
1910         sbi->s_dmode = uopt.dmode;
1911         sbi->s_nls_map = uopt.nls_map;
1912
1913         if (uopt.session == 0xFFFFFFFF)
1914                 sbi->s_session = udf_get_last_session(sb);
1915         else
1916                 sbi->s_session = uopt.session;
1917
1918         udf_debug("Multi-session=%d\n", sbi->s_session);
1919
1920         /* Fill in the rest of the superblock */
1921         sb->s_op = &udf_sb_ops;
1922         sb->s_export_op = &udf_export_ops;
1923         sb->dq_op = NULL;
1924         sb->s_dirt = 0;
1925         sb->s_magic = UDF_SUPER_MAGIC;
1926         sb->s_time_gran = 1000;
1927
1928         if (uopt.flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) {
1929                 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1930         } else {
1931                 uopt.blocksize = bdev_hardsect_size(sb->s_bdev);
1932                 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1933                 if (!ret && uopt.blocksize != UDF_DEFAULT_BLOCKSIZE) {
1934                         if (!silent)
1935                                 printk(KERN_NOTICE
1936                                        "UDF-fs: Rescanning with blocksize "
1937                                        "%d\n", UDF_DEFAULT_BLOCKSIZE);
1938                         uopt.blocksize = UDF_DEFAULT_BLOCKSIZE;
1939                         ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1940                 }
1941         }
1942         if (!ret) {
1943                 printk(KERN_WARNING "UDF-fs: No partition found (1)\n");
1944                 goto error_out;
1945         }
1946
1947         udf_debug("Lastblock=%d\n", sbi->s_last_block);
1948
1949         if (sbi->s_lvid_bh) {
1950                 struct logicalVolIntegrityDescImpUse *lvidiu =
1951                                                         udf_sb_lvidiu(sbi);
1952                 uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
1953                 uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
1954                 /* uint16_t maxUDFWriteRev =
1955                                 le16_to_cpu(lvidiu->maxUDFWriteRev); */
1956
1957                 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
1958                         printk(KERN_ERR "UDF-fs: minUDFReadRev=%x "
1959                                         "(max is %x)\n",
1960                                le16_to_cpu(lvidiu->minUDFReadRev),
1961                                UDF_MAX_READ_VERSION);
1962                         goto error_out;
1963                 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
1964                         sb->s_flags |= MS_RDONLY;
1965
1966                 sbi->s_udfrev = minUDFWriteRev;
1967
1968                 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1969                         UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
1970                 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
1971                         UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
1972         }
1973
1974         if (!sbi->s_partitions) {
1975                 printk(KERN_WARNING "UDF-fs: No partition found (2)\n");
1976                 goto error_out;
1977         }
1978
1979         if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
1980                         UDF_PART_FLAG_READ_ONLY) {
1981                 printk(KERN_NOTICE "UDF-fs: Partition marked readonly; "
1982                                    "forcing readonly mount\n");
1983                 sb->s_flags |= MS_RDONLY;
1984         }
1985
1986         if (udf_find_fileset(sb, &fileset, &rootdir)) {
1987                 printk(KERN_WARNING "UDF-fs: No fileset found\n");
1988                 goto error_out;
1989         }
1990
1991         if (!silent) {
1992                 struct timestamp ts;
1993                 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
1994                 udf_info("UDF: Mounting volume '%s', "
1995                          "timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
1996                          sbi->s_volume_ident, le16_to_cpu(ts.year), ts.month, ts.day,
1997                          ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
1998         }
1999         if (!(sb->s_flags & MS_RDONLY))
2000                 udf_open_lvid(sb);
2001
2002         /* Assign the root inode */
2003         /* assign inodes by physical block number */
2004         /* perhaps it's not extensible enough, but for now ... */
2005         inode = udf_iget(sb, &rootdir);
2006         if (!inode) {
2007                 printk(KERN_ERR "UDF-fs: Error in udf_iget, block=%d, "
2008                                 "partition=%d\n",
2009                        rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
2010                 goto error_out;
2011         }
2012
2013         /* Allocate a dentry for the root inode */
2014         sb->s_root = d_alloc_root(inode);
2015         if (!sb->s_root) {
2016                 printk(KERN_ERR "UDF-fs: Couldn't allocate root dentry\n");
2017                 iput(inode);
2018                 goto error_out;
2019         }
2020         sb->s_maxbytes = MAX_LFS_FILESIZE;
2021         return 0;
2022
2023 error_out:
2024         if (sbi->s_vat_inode)
2025                 iput(sbi->s_vat_inode);
2026         if (sbi->s_partitions)
2027                 for (i = 0; i < sbi->s_partitions; i++)
2028                         udf_free_partition(&sbi->s_partmaps[i]);
2029 #ifdef CONFIG_UDF_NLS
2030         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2031                 unload_nls(sbi->s_nls_map);
2032 #endif
2033         if (!(sb->s_flags & MS_RDONLY))
2034                 udf_close_lvid(sb);
2035         brelse(sbi->s_lvid_bh);
2036
2037         kfree(sbi->s_partmaps);
2038         kfree(sbi);
2039         sb->s_fs_info = NULL;
2040
2041         return -EINVAL;
2042 }
2043
2044 static void udf_error(struct super_block *sb, const char *function,
2045                       const char *fmt, ...)
2046 {
2047         va_list args;
2048
2049         if (!(sb->s_flags & MS_RDONLY)) {
2050                 /* mark sb error */
2051                 sb->s_dirt = 1;
2052         }
2053         va_start(args, fmt);
2054         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2055         va_end(args);
2056         printk(KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
2057                 sb->s_id, function, error_buf);
2058 }
2059
2060 void udf_warning(struct super_block *sb, const char *function,
2061                  const char *fmt, ...)
2062 {
2063         va_list args;
2064
2065         va_start(args, fmt);
2066         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2067         va_end(args);
2068         printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
2069                sb->s_id, function, error_buf);
2070 }
2071
2072 static void udf_put_super(struct super_block *sb)
2073 {
2074         int i;
2075         struct udf_sb_info *sbi;
2076
2077         sbi = UDF_SB(sb);
2078         if (sbi->s_vat_inode)
2079                 iput(sbi->s_vat_inode);
2080         if (sbi->s_partitions)
2081                 for (i = 0; i < sbi->s_partitions; i++)
2082                         udf_free_partition(&sbi->s_partmaps[i]);
2083 #ifdef CONFIG_UDF_NLS
2084         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2085                 unload_nls(sbi->s_nls_map);
2086 #endif
2087         if (!(sb->s_flags & MS_RDONLY))
2088                 udf_close_lvid(sb);
2089         brelse(sbi->s_lvid_bh);
2090         kfree(sbi->s_partmaps);
2091         kfree(sb->s_fs_info);
2092         sb->s_fs_info = NULL;
2093 }
2094
2095 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
2096 {
2097         struct super_block *sb = dentry->d_sb;
2098         struct udf_sb_info *sbi = UDF_SB(sb);
2099         struct logicalVolIntegrityDescImpUse *lvidiu;
2100         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
2101
2102         if (sbi->s_lvid_bh != NULL)
2103                 lvidiu = udf_sb_lvidiu(sbi);
2104         else
2105                 lvidiu = NULL;
2106
2107         buf->f_type = UDF_SUPER_MAGIC;
2108         buf->f_bsize = sb->s_blocksize;
2109         buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
2110         buf->f_bfree = udf_count_free(sb);
2111         buf->f_bavail = buf->f_bfree;
2112         buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2113                                           le32_to_cpu(lvidiu->numDirs)) : 0)
2114                         + buf->f_bfree;
2115         buf->f_ffree = buf->f_bfree;
2116         buf->f_namelen = UDF_NAME_LEN - 2;
2117         buf->f_fsid.val[0] = (u32)id;
2118         buf->f_fsid.val[1] = (u32)(id >> 32);
2119
2120         return 0;
2121 }
2122
2123 static unsigned int udf_count_free_bitmap(struct super_block *sb,
2124                                           struct udf_bitmap *bitmap)
2125 {
2126         struct buffer_head *bh = NULL;
2127         unsigned int accum = 0;
2128         int index;
2129         int block = 0, newblock;
2130         struct kernel_lb_addr loc;
2131         uint32_t bytes;
2132         uint8_t *ptr;
2133         uint16_t ident;
2134         struct spaceBitmapDesc *bm;
2135
2136         lock_kernel();
2137
2138         loc.logicalBlockNum = bitmap->s_extPosition;
2139         loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
2140         bh = udf_read_ptagged(sb, &loc, 0, &ident);
2141
2142         if (!bh) {
2143                 printk(KERN_ERR "udf: udf_count_free failed\n");
2144                 goto out;
2145         } else if (ident != TAG_IDENT_SBD) {
2146                 brelse(bh);
2147                 printk(KERN_ERR "udf: udf_count_free failed\n");
2148                 goto out;
2149         }
2150
2151         bm = (struct spaceBitmapDesc *)bh->b_data;
2152         bytes = le32_to_cpu(bm->numOfBytes);
2153         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2154         ptr = (uint8_t *)bh->b_data;
2155
2156         while (bytes > 0) {
2157                 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2158                 accum += bitmap_weight((const unsigned long *)(ptr + index),
2159                                         cur_bytes * 8);
2160                 bytes -= cur_bytes;
2161                 if (bytes) {
2162                         brelse(bh);
2163                         newblock = udf_get_lb_pblock(sb, &loc, ++block);
2164                         bh = udf_tread(sb, newblock);
2165                         if (!bh) {
2166                                 udf_debug("read failed\n");
2167                                 goto out;
2168                         }
2169                         index = 0;
2170                         ptr = (uint8_t *)bh->b_data;
2171                 }
2172         }
2173         brelse(bh);
2174
2175 out:
2176         unlock_kernel();
2177
2178         return accum;
2179 }
2180
2181 static unsigned int udf_count_free_table(struct super_block *sb,
2182                                          struct inode *table)
2183 {
2184         unsigned int accum = 0;
2185         uint32_t elen;
2186         struct kernel_lb_addr eloc;
2187         int8_t etype;
2188         struct extent_position epos;
2189
2190         lock_kernel();
2191
2192         epos.block = UDF_I(table)->i_location;
2193         epos.offset = sizeof(struct unallocSpaceEntry);
2194         epos.bh = NULL;
2195
2196         while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2197                 accum += (elen >> table->i_sb->s_blocksize_bits);
2198
2199         brelse(epos.bh);
2200
2201         unlock_kernel();
2202
2203         return accum;
2204 }
2205
2206 static unsigned int udf_count_free(struct super_block *sb)
2207 {
2208         unsigned int accum = 0;
2209         struct udf_sb_info *sbi;
2210         struct udf_part_map *map;
2211
2212         sbi = UDF_SB(sb);
2213         if (sbi->s_lvid_bh) {
2214                 struct logicalVolIntegrityDesc *lvid =
2215                         (struct logicalVolIntegrityDesc *)
2216                         sbi->s_lvid_bh->b_data;
2217                 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
2218                         accum = le32_to_cpu(
2219                                         lvid->freeSpaceTable[sbi->s_partition]);
2220                         if (accum == 0xFFFFFFFF)
2221                                 accum = 0;
2222                 }
2223         }
2224
2225         if (accum)
2226                 return accum;
2227
2228         map = &sbi->s_partmaps[sbi->s_partition];
2229         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2230                 accum += udf_count_free_bitmap(sb,
2231                                                map->s_uspace.s_bitmap);
2232         }
2233         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
2234                 accum += udf_count_free_bitmap(sb,
2235                                                map->s_fspace.s_bitmap);
2236         }
2237         if (accum)
2238                 return accum;
2239
2240         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2241                 accum += udf_count_free_table(sb,
2242                                               map->s_uspace.s_table);
2243         }
2244         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
2245                 accum += udf_count_free_table(sb,
2246                                               map->s_fspace.s_table);
2247         }
2248
2249         return accum;
2250 }