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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 int udf_sync_fs(struct super_block *, int);
  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         .sync_fs        = udf_sync_fs,
 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 int udf_remount_fs(struct super_block *sb, int *flags, char *options)
 557 {
 558         struct udf_options uopt;
 559         struct udf_sb_info *sbi = UDF_SB(sb);
 560
 561         uopt.flags = sbi->s_flags;
 562         uopt.uid   = sbi->s_uid;
 563         uopt.gid   = sbi->s_gid;
 564         uopt.umask = sbi->s_umask;
 565         uopt.fmode = sbi->s_fmode;
 566         uopt.dmode = sbi->s_dmode;
 567
 568         if (!udf_parse_options(options, &uopt, true))
 569                 return -EINVAL;
 570
 571         lock_kernel();
 572         sbi->s_flags = uopt.flags;
 573         sbi->s_uid   = uopt.uid;
 574         sbi->s_gid   = uopt.gid;
 575         sbi->s_umask = uopt.umask;
 576         sbi->s_fmode = uopt.fmode;
 577         sbi->s_dmode = uopt.dmode;
 578
 579         if (sbi->s_lvid_bh) {
 580                 int write_rev = le16_to_cpu(udf_sb_lvidiu(sbi)->minUDFWriteRev);
 581                 if (write_rev > UDF_MAX_WRITE_VERSION)
 582                         *flags |= MS_RDONLY;
 583         }
 584
 585         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) {
 586                 unlock_kernel();
 587                 return 0;
 588         }
 589         if (*flags & MS_RDONLY)
 590                 udf_close_lvid(sb);
 591         else
 592                 udf_open_lvid(sb);
 593
 594         unlock_kernel();
 595         return 0;
 596 }
 597
 598 /* Check Volume Structure Descriptors (ECMA 167 2/9.1) */
 599 /* We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
 600 static loff_t udf_check_vsd(struct super_block *sb)
 601 {
 602         struct volStructDesc *vsd = NULL;
 603         loff_t sector = 32768;
 604         int sectorsize;
 605         struct buffer_head *bh = NULL;
 606         int nsr02 = 0;
 607         int nsr03 = 0;
 608         struct udf_sb_info *sbi;
 609
 610         sbi = UDF_SB(sb);
 611         if (sb->s_blocksize < sizeof(struct volStructDesc))
 612                 sectorsize = sizeof(struct volStructDesc);
 613         else
 614                 sectorsize = sb->s_blocksize;
 615
 616         sector += (sbi->s_session << sb->s_blocksize_bits);
 617
 618         udf_debug("Starting at sector %u (%ld byte sectors)\n",
 619                   (unsigned int)(sector >> sb->s_blocksize_bits),
 620                   sb->s_blocksize);
 621         /* Process the sequence (if applicable) */
 622         for (; !nsr02 && !nsr03; sector += sectorsize) {
 623                 /* Read a block */
 624                 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
 625                 if (!bh)
 626                         break;
 627
 628                 /* Look for ISO  descriptors */
 629                 vsd = (struct volStructDesc *)(bh->b_data +
 630                                               (sector & (sb->s_blocksize - 1)));
 631
 632                 if (vsd->stdIdent[0] == 0) {
 633                         brelse(bh);
 634                         break;
 635                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
 636                                     VSD_STD_ID_LEN)) {
 637                         switch (vsd->structType) {
 638                         case 0:
 639                                 udf_debug("ISO9660 Boot Record found\n");
 640                                 break;
 641                         case 1:
 642                                 udf_debug("ISO9660 Primary Volume Descriptor "
 643                                           "found\n");
 644                                 break;
 645                         case 2:
 646                                 udf_debug("ISO9660 Supplementary Volume "
 647                                           "Descriptor found\n");
 648                                 break;
 649                         case 3:
 650                                 udf_debug("ISO9660 Volume Partition Descriptor "
 651                                           "found\n");
 652                                 break;
 653                         case 255:
 654                                 udf_debug("ISO9660 Volume Descriptor Set "
 655                                           "Terminator found\n");
 656                                 break;
 657                         default:
 658                                 udf_debug("ISO9660 VRS (%u) found\n",
 659                                           vsd->structType);
 660                                 break;
 661                         }
 662                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
 663                                     VSD_STD_ID_LEN))
 664                         ; /* nothing */
 665                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
 666                                     VSD_STD_ID_LEN)) {
 667                         brelse(bh);
 668                         break;
 669                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
 670                                     VSD_STD_ID_LEN))
 671                         nsr02 = sector;
 672                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
 673                                     VSD_STD_ID_LEN))
 674                         nsr03 = sector;
 675                 brelse(bh);
 676         }
 677
 678         if (nsr03)
 679                 return nsr03;
 680         else if (nsr02)
 681                 return nsr02;
 682         else if (sector - (sbi->s_session << sb->s_blocksize_bits) == 32768)
 683                 return -1;
 684         else
 685                 return 0;
 686 }
 687
 688 static int udf_find_fileset(struct super_block *sb,
 689                             struct kernel_lb_addr *fileset,
 690                             struct kernel_lb_addr *root)
 691 {
 692         struct buffer_head *bh = NULL;
 693         long lastblock;
 694         uint16_t ident;
 695         struct udf_sb_info *sbi;
 696
 697         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
 698             fileset->partitionReferenceNum != 0xFFFF) {
 699                 bh = udf_read_ptagged(sb, fileset, 0, &ident);
 700
 701                 if (!bh) {
 702                         return 1;
 703                 } else if (ident != TAG_IDENT_FSD) {
 704                         brelse(bh);
 705                         return 1;
 706                 }
 707
 708         }
 709
 710         sbi = UDF_SB(sb);
 711         if (!bh) {
 712                 /* Search backwards through the partitions */
 713                 struct kernel_lb_addr newfileset;
 714
 715 /* --> cvg: FIXME - is it reasonable? */
 716                 return 1;
 717
 718                 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
 719                      (newfileset.partitionReferenceNum != 0xFFFF &&
 720                       fileset->logicalBlockNum == 0xFFFFFFFF &&
 721                       fileset->partitionReferenceNum == 0xFFFF);
 722                      newfileset.partitionReferenceNum--) {
 723                         lastblock = sbi->s_partmaps
 724                                         [newfileset.partitionReferenceNum]
 725                                                 .s_partition_len;
 726                         newfileset.logicalBlockNum = 0;
 727
 728                         do {
 729                                 bh = udf_read_ptagged(sb, &newfileset, 0,
 730                                                       &ident);
 731                                 if (!bh) {
 732                                         newfileset.logicalBlockNum++;
 733                                         continue;
 734                                 }
 735
 736                                 switch (ident) {
 737                                 case TAG_IDENT_SBD:
 738                                 {
 739                                         struct spaceBitmapDesc *sp;
 740                                         sp = (struct spaceBitmapDesc *)
 741                                                                 bh->b_data;
 742                                         newfileset.logicalBlockNum += 1 +
 743                                                 ((le32_to_cpu(sp->numOfBytes) +
 744                                                   sizeof(struct spaceBitmapDesc)
 745                                                   - 1) >> sb->s_blocksize_bits);
 746                                         brelse(bh);
 747                                         break;
 748                                 }
 749                                 case TAG_IDENT_FSD:
 750                                         *fileset = newfileset;
 751                                         break;
 752                                 default:
 753                                         newfileset.logicalBlockNum++;
 754                                         brelse(bh);
 755                                         bh = NULL;
 756                                         break;
 757                                 }
 758                         } while (newfileset.logicalBlockNum < lastblock &&
 759                                  fileset->logicalBlockNum == 0xFFFFFFFF &&
 760                                  fileset->partitionReferenceNum == 0xFFFF);
 761                 }
 762         }
 763
 764         if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
 765              fileset->partitionReferenceNum != 0xFFFF) && bh) {
 766                 udf_debug("Fileset at block=%d, partition=%d\n",
 767                           fileset->logicalBlockNum,
 768                           fileset->partitionReferenceNum);
 769
 770                 sbi->s_partition = fileset->partitionReferenceNum;
 771                 udf_load_fileset(sb, bh, root);
 772                 brelse(bh);
 773                 return 0;
 774         }
 775         return 1;
 776 }
 777
 778 static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
 779 {
 780         struct primaryVolDesc *pvoldesc;
 781         struct ustr *instr, *outstr;
 782         struct buffer_head *bh;
 783         uint16_t ident;
 784         int ret = 1;
 785
 786         instr = kmalloc(sizeof(struct ustr), GFP_NOFS);
 787         if (!instr)
 788                 return 1;
 789
 790         outstr = kmalloc(sizeof(struct ustr), GFP_NOFS);
 791         if (!outstr)
 792                 goto out1;
 793
 794         bh = udf_read_tagged(sb, block, block, &ident);
 795         if (!bh)
 796                 goto out2;
 797
 798         BUG_ON(ident != TAG_IDENT_PVD);
 799
 800         pvoldesc = (struct primaryVolDesc *)bh->b_data;
 801
 802         if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
 803                               pvoldesc->recordingDateAndTime)) {
 804 #ifdef UDFFS_DEBUG
 805                 struct timestamp *ts = &pvoldesc->recordingDateAndTime;
 806                 udf_debug("recording time %04u/%02u/%02u"
 807                           " %02u:%02u (%x)\n",
 808                           le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
 809                           ts->minute, le16_to_cpu(ts->typeAndTimezone));
 810 #endif
 811         }
 812
 813         if (!udf_build_ustr(instr, pvoldesc->volIdent, 32))
 814                 if (udf_CS0toUTF8(outstr, instr)) {
 815                         strncpy(UDF_SB(sb)->s_volume_ident, outstr->u_name,
 816                                 outstr->u_len > 31 ? 31 : outstr->u_len);
 817                         udf_debug("volIdent[] = '%s'\n",
 818                                         UDF_SB(sb)->s_volume_ident);
 819                 }
 820
 821         if (!udf_build_ustr(instr, pvoldesc->volSetIdent, 128))
 822                 if (udf_CS0toUTF8(outstr, instr))
 823                         udf_debug("volSetIdent[] = '%s'\n", outstr->u_name);
 824
 825         brelse(bh);
 826         ret = 0;
 827 out2:
 828         kfree(outstr);
 829 out1:
 830         kfree(instr);
 831         return ret;
 832 }
 833
 834 static int udf_load_metadata_files(struct super_block *sb, int partition)
 835 {
 836         struct udf_sb_info *sbi = UDF_SB(sb);
 837         struct udf_part_map *map;
 838         struct udf_meta_data *mdata;
 839         struct kernel_lb_addr addr;
 840         int fe_error = 0;
 841
 842         map = &sbi->s_partmaps[partition];
 843         mdata = &map->s_type_specific.s_metadata;
 844
 845         /* metadata address */
 846         addr.logicalBlockNum =  mdata->s_meta_file_loc;
 847         addr.partitionReferenceNum = map->s_partition_num;
 848
 849         udf_debug("Metadata file location: block = %d part = %d\n",
 850                           addr.logicalBlockNum, addr.partitionReferenceNum);
 851
 852         mdata->s_metadata_fe = udf_iget(sb, &addr);
 853
 854         if (mdata->s_metadata_fe == NULL) {
 855                 udf_warning(sb, __func__, "metadata inode efe not found, "
 856                                 "will try mirror inode.");
 857                 fe_error = 1;
 858         } else if (UDF_I(mdata->s_metadata_fe)->i_alloc_type !=
 859                  ICBTAG_FLAG_AD_SHORT) {
 860                 udf_warning(sb, __func__, "metadata inode efe does not have "
 861                         "short allocation descriptors!");
 862                 fe_error = 1;
 863                 iput(mdata->s_metadata_fe);
 864                 mdata->s_metadata_fe = NULL;
 865         }
 866
 867         /* mirror file entry */
 868         addr.logicalBlockNum = mdata->s_mirror_file_loc;
 869         addr.partitionReferenceNum = map->s_partition_num;
 870
 871         udf_debug("Mirror metadata file location: block = %d part = %d\n",
 872                           addr.logicalBlockNum, addr.partitionReferenceNum);
 873
 874         mdata->s_mirror_fe = udf_iget(sb, &addr);
 875
 876         if (mdata->s_mirror_fe == NULL) {
 877                 if (fe_error) {
 878                         udf_error(sb, __func__, "mirror inode efe not found "
 879                         "and metadata inode is missing too, exiting...");
 880                         goto error_exit;
 881                 } else
 882                         udf_warning(sb, __func__, "mirror inode efe not found,"
 883                                         " but metadata inode is OK");
 884         } else if (UDF_I(mdata->s_mirror_fe)->i_alloc_type !=
 885                  ICBTAG_FLAG_AD_SHORT) {
 886                 udf_warning(sb, __func__, "mirror inode efe does not have "
 887                         "short allocation descriptors!");
 888                 iput(mdata->s_mirror_fe);
 889                 mdata->s_mirror_fe = NULL;
 890                 if (fe_error)
 891                         goto error_exit;
 892         }
 893
 894         /*
 895          * bitmap file entry
 896          * Note:
 897          * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
 898         */
 899         if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
 900                 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
 901                 addr.partitionReferenceNum = map->s_partition_num;
 902
 903                 udf_debug("Bitmap file location: block = %d part = %d\n",
 904                         addr.logicalBlockNum, addr.partitionReferenceNum);
 905
 906                 mdata->s_bitmap_fe = udf_iget(sb, &addr);
 907
 908                 if (mdata->s_bitmap_fe == NULL) {
 909                         if (sb->s_flags & MS_RDONLY)
 910                                 udf_warning(sb, __func__, "bitmap inode efe "
 911                                         "not found but it's ok since the disc"
 912                                         " is mounted read-only");
 913                         else {
 914                                 udf_error(sb, __func__, "bitmap inode efe not "
 915                                         "found and attempted read-write mount");
 916                                 goto error_exit;
 917                         }
 918                 }
 919         }
 920
 921         udf_debug("udf_load_metadata_files Ok\n");
 922
 923         return 0;
 924
 925 error_exit:
 926         return 1;
 927 }
 928
 929 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
 930                              struct kernel_lb_addr *root)
 931 {
 932         struct fileSetDesc *fset;
 933
 934         fset = (struct fileSetDesc *)bh->b_data;
 935
 936         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
 937
 938         UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
 939
 940         udf_debug("Rootdir at block=%d, partition=%d\n",
 941                   root->logicalBlockNum, root->partitionReferenceNum);
 942 }
 943
 944 int udf_compute_nr_groups(struct super_block *sb, u32 partition)
 945 {
 946         struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
 947         return DIV_ROUND_UP(map->s_partition_len +
 948                             (sizeof(struct spaceBitmapDesc) << 3),
 949                             sb->s_blocksize * 8);
 950 }
 951
 952 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
 953 {
 954         struct udf_bitmap *bitmap;
 955         int nr_groups;
 956         int size;
 957
 958         nr_groups = udf_compute_nr_groups(sb, index);
 959         size = sizeof(struct udf_bitmap) +
 960                 (sizeof(struct buffer_head *) * nr_groups);
 961
 962         if (size <= PAGE_SIZE)
 963                 bitmap = kmalloc(size, GFP_KERNEL);
 964         else
 965                 bitmap = vmalloc(size); /* TODO: get rid of vmalloc */
 966
 967         if (bitmap == NULL) {
 968                 udf_error(sb, __func__,
 969                           "Unable to allocate space for bitmap "
 970                           "and %d buffer_head pointers", nr_groups);
 971                 return NULL;
 972         }
 973
 974         memset(bitmap, 0x00, size);
 975         bitmap->s_block_bitmap = (struct buffer_head **)(bitmap + 1);
 976         bitmap->s_nr_groups = nr_groups;
 977         return bitmap;
 978 }
 979
 980 static int udf_fill_partdesc_info(struct super_block *sb,
 981                 struct partitionDesc *p, int p_index)
 982 {
 983         struct udf_part_map *map;
 984         struct udf_sb_info *sbi = UDF_SB(sb);
 985         struct partitionHeaderDesc *phd;
 986
 987         map = &sbi->s_partmaps[p_index];
 988
 989         map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
 990         map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
 991
 992         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
 993                 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
 994         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
 995                 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
 996         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
 997                 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
 998         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
 999                 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
1000
1001         udf_debug("Partition (%d type %x) starts at physical %d, "
1002                   "block length %d\n", p_index,
1003                   map->s_partition_type, map->s_partition_root,
1004                   map->s_partition_len);
1005
1006         if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1007             strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
1008                 return 0;
1009
1010         phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1011         if (phd->unallocSpaceTable.extLength) {
1012                 struct kernel_lb_addr loc = {
1013                         .logicalBlockNum = le32_to_cpu(
1014                                 phd->unallocSpaceTable.extPosition),
1015                         .partitionReferenceNum = p_index,
1016                 };
1017
1018                 map->s_uspace.s_table = udf_iget(sb, &loc);
1019                 if (!map->s_uspace.s_table) {
1020                         udf_debug("cannot load unallocSpaceTable (part %d)\n",
1021                                         p_index);
1022                         return 1;
1023                 }
1024                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1025                 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
1026                                 p_index, map->s_uspace.s_table->i_ino);
1027         }
1028
1029         if (phd->unallocSpaceBitmap.extLength) {
1030                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1031                 if (!bitmap)
1032                         return 1;
1033                 map->s_uspace.s_bitmap = bitmap;
1034                 bitmap->s_extLength = le32_to_cpu(
1035                                 phd->unallocSpaceBitmap.extLength);
1036                 bitmap->s_extPosition = le32_to_cpu(
1037                                 phd->unallocSpaceBitmap.extPosition);
1038                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1039                 udf_debug("unallocSpaceBitmap (part %d) @ %d\n", p_index,
1040                                                 bitmap->s_extPosition);
1041         }
1042
1043         if (phd->partitionIntegrityTable.extLength)
1044                 udf_debug("partitionIntegrityTable (part %d)\n", p_index);
1045
1046         if (phd->freedSpaceTable.extLength) {
1047                 struct kernel_lb_addr loc = {
1048                         .logicalBlockNum = le32_to_cpu(
1049                                 phd->freedSpaceTable.extPosition),
1050                         .partitionReferenceNum = p_index,
1051                 };
1052
1053                 map->s_fspace.s_table = udf_iget(sb, &loc);
1054                 if (!map->s_fspace.s_table) {
1055                         udf_debug("cannot load freedSpaceTable (part %d)\n",
1056                                 p_index);
1057                         return 1;
1058                 }
1059
1060                 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
1061                 udf_debug("freedSpaceTable (part %d) @ %ld\n",
1062                                 p_index, map->s_fspace.s_table->i_ino);
1063         }
1064
1065         if (phd->freedSpaceBitmap.extLength) {
1066                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1067                 if (!bitmap)
1068                         return 1;
1069                 map->s_fspace.s_bitmap = bitmap;
1070                 bitmap->s_extLength = le32_to_cpu(
1071                                 phd->freedSpaceBitmap.extLength);
1072                 bitmap->s_extPosition = le32_to_cpu(
1073                                 phd->freedSpaceBitmap.extPosition);
1074                 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1075                 udf_debug("freedSpaceBitmap (part %d) @ %d\n", p_index,
1076                                         bitmap->s_extPosition);
1077         }
1078         return 0;
1079 }
1080
1081 static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1082 {
1083         struct udf_sb_info *sbi = UDF_SB(sb);
1084         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1085         struct kernel_lb_addr ino;
1086         struct buffer_head *bh = NULL;
1087         struct udf_inode_info *vati;
1088         uint32_t pos;
1089         struct virtualAllocationTable20 *vat20;
1090
1091         /* VAT file entry is in the last recorded block */
1092         ino.partitionReferenceNum = type1_index;
1093         ino.logicalBlockNum = sbi->s_last_block - map->s_partition_root;
1094         sbi->s_vat_inode = udf_iget(sb, &ino);
1095         if (!sbi->s_vat_inode)
1096                 return 1;
1097
1098         if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1099                 map->s_type_specific.s_virtual.s_start_offset = 0;
1100                 map->s_type_specific.s_virtual.s_num_entries =
1101                         (sbi->s_vat_inode->i_size - 36) >> 2;
1102         } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1103                 vati = UDF_I(sbi->s_vat_inode);
1104                 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1105                         pos = udf_block_map(sbi->s_vat_inode, 0);
1106                         bh = sb_bread(sb, pos);
1107                         if (!bh)
1108                                 return 1;
1109                         vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1110                 } else {
1111                         vat20 = (struct virtualAllocationTable20 *)
1112                                                         vati->i_ext.i_data;
1113                 }
1114
1115                 map->s_type_specific.s_virtual.s_start_offset =
1116                         le16_to_cpu(vat20->lengthHeader);
1117                 map->s_type_specific.s_virtual.s_num_entries =
1118                         (sbi->s_vat_inode->i_size -
1119                                 map->s_type_specific.s_virtual.
1120                                         s_start_offset) >> 2;
1121                 brelse(bh);
1122         }
1123         return 0;
1124 }
1125
1126 static int udf_load_partdesc(struct super_block *sb, sector_t block)
1127 {
1128         struct buffer_head *bh;
1129         struct partitionDesc *p;
1130         struct udf_part_map *map;
1131         struct udf_sb_info *sbi = UDF_SB(sb);
1132         int i, type1_idx;
1133         uint16_t partitionNumber;
1134         uint16_t ident;
1135         int ret = 0;
1136
1137         bh = udf_read_tagged(sb, block, block, &ident);
1138         if (!bh)
1139                 return 1;
1140         if (ident != TAG_IDENT_PD)
1141                 goto out_bh;
1142
1143         p = (struct partitionDesc *)bh->b_data;
1144         partitionNumber = le16_to_cpu(p->partitionNumber);
1145
1146         /* First scan for TYPE1, SPARABLE and METADATA partitions */
1147         for (i = 0; i < sbi->s_partitions; i++) {
1148                 map = &sbi->s_partmaps[i];
1149                 udf_debug("Searching map: (%d == %d)\n",
1150                           map->s_partition_num, partitionNumber);
1151                 if (map->s_partition_num == partitionNumber &&
1152                     (map->s_partition_type == UDF_TYPE1_MAP15 ||
1153                      map->s_partition_type == UDF_SPARABLE_MAP15))
1154                         break;
1155         }
1156
1157         if (i >= sbi->s_partitions) {
1158                 udf_debug("Partition (%d) not found in partition map\n",
1159                           partitionNumber);
1160                 goto out_bh;
1161         }
1162
1163         ret = udf_fill_partdesc_info(sb, p, i);
1164
1165         /*
1166          * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1167          * PHYSICAL partitions are already set up
1168          */
1169         type1_idx = i;
1170         for (i = 0; i < sbi->s_partitions; i++) {
1171                 map = &sbi->s_partmaps[i];
1172
1173                 if (map->s_partition_num == partitionNumber &&
1174                     (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1175                      map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1176                      map->s_partition_type == UDF_METADATA_MAP25))
1177                         break;
1178         }
1179
1180         if (i >= sbi->s_partitions)
1181                 goto out_bh;
1182
1183         ret = udf_fill_partdesc_info(sb, p, i);
1184         if (ret)
1185                 goto out_bh;
1186
1187         if (map->s_partition_type == UDF_METADATA_MAP25) {
1188                 ret = udf_load_metadata_files(sb, i);
1189                 if (ret) {
1190                         printk(KERN_ERR "UDF-fs: error loading MetaData "
1191                         "partition map %d\n", i);
1192                         goto out_bh;
1193                 }
1194         } else {
1195                 ret = udf_load_vat(sb, i, type1_idx);
1196                 if (ret)
1197                         goto out_bh;
1198                 /*
1199                  * Mark filesystem read-only if we have a partition with
1200                  * virtual map since we don't handle writing to it (we
1201                  * overwrite blocks instead of relocating them).
1202                  */
1203                 sb->s_flags |= MS_RDONLY;
1204                 printk(KERN_NOTICE "UDF-fs: Filesystem marked read-only "
1205                         "because writing to pseudooverwrite partition is "
1206                         "not implemented.\n");
1207         }
1208 out_bh:
1209         /* In case loading failed, we handle cleanup in udf_fill_super */
1210         brelse(bh);
1211         return ret;
1212 }
1213
1214 static int udf_load_logicalvol(struct super_block *sb, sector_t block,
1215                                struct kernel_lb_addr *fileset)
1216 {
1217         struct logicalVolDesc *lvd;
1218         int i, j, offset;
1219         uint8_t type;
1220         struct udf_sb_info *sbi = UDF_SB(sb);
1221         struct genericPartitionMap *gpm;
1222         uint16_t ident;
1223         struct buffer_head *bh;
1224         int ret = 0;
1225
1226         bh = udf_read_tagged(sb, block, block, &ident);
1227         if (!bh)
1228                 return 1;
1229         BUG_ON(ident != TAG_IDENT_LVD);
1230         lvd = (struct logicalVolDesc *)bh->b_data;
1231
1232         i = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1233         if (i != 0) {
1234                 ret = i;
1235                 goto out_bh;
1236         }
1237
1238         for (i = 0, offset = 0;
1239              i < sbi->s_partitions && offset < le32_to_cpu(lvd->mapTableLength);
1240              i++, offset += gpm->partitionMapLength) {
1241                 struct udf_part_map *map = &sbi->s_partmaps[i];
1242                 gpm = (struct genericPartitionMap *)
1243                                 &(lvd->partitionMaps[offset]);
1244                 type = gpm->partitionMapType;
1245                 if (type == 1) {
1246                         struct genericPartitionMap1 *gpm1 =
1247                                 (struct genericPartitionMap1 *)gpm;
1248                         map->s_partition_type = UDF_TYPE1_MAP15;
1249                         map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1250                         map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1251                         map->s_partition_func = NULL;
1252                 } else if (type == 2) {
1253                         struct udfPartitionMap2 *upm2 =
1254                                                 (struct udfPartitionMap2 *)gpm;
1255                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1256                                                 strlen(UDF_ID_VIRTUAL))) {
1257                                 u16 suf =
1258                                         le16_to_cpu(((__le16 *)upm2->partIdent.
1259                                                         identSuffix)[0]);
1260                                 if (suf < 0x0200) {
1261                                         map->s_partition_type =
1262                                                         UDF_VIRTUAL_MAP15;
1263                                         map->s_partition_func =
1264                                                         udf_get_pblock_virt15;
1265                                 } else {
1266                                         map->s_partition_type =
1267                                                         UDF_VIRTUAL_MAP20;
1268                                         map->s_partition_func =
1269                                                         udf_get_pblock_virt20;
1270                                 }
1271                         } else if (!strncmp(upm2->partIdent.ident,
1272                                                 UDF_ID_SPARABLE,
1273                                                 strlen(UDF_ID_SPARABLE))) {
1274                                 uint32_t loc;
1275                                 struct sparingTable *st;
1276                                 struct sparablePartitionMap *spm =
1277                                         (struct sparablePartitionMap *)gpm;
1278
1279                                 map->s_partition_type = UDF_SPARABLE_MAP15;
1280                                 map->s_type_specific.s_sparing.s_packet_len =
1281                                                 le16_to_cpu(spm->packetLength);
1282                                 for (j = 0; j < spm->numSparingTables; j++) {
1283                                         struct buffer_head *bh2;
1284
1285                                         loc = le32_to_cpu(
1286                                                 spm->locSparingTable[j]);
1287                                         bh2 = udf_read_tagged(sb, loc, loc,
1288                                                              &ident);
1289                                         map->s_type_specific.s_sparing.
1290                                                         s_spar_map[j] = bh2;
1291
1292                                         if (bh2 == NULL)
1293                                                 continue;
1294
1295                                         st = (struct sparingTable *)bh2->b_data;
1296                                         if (ident != 0 || strncmp(
1297                                                 st->sparingIdent.ident,
1298                                                 UDF_ID_SPARING,
1299                                                 strlen(UDF_ID_SPARING))) {
1300                                                 brelse(bh2);
1301                                                 map->s_type_specific.s_sparing.
1302                                                         s_spar_map[j] = NULL;
1303                                         }
1304                                 }
1305                                 map->s_partition_func = udf_get_pblock_spar15;
1306                         } else if (!strncmp(upm2->partIdent.ident,
1307                                                 UDF_ID_METADATA,
1308                                                 strlen(UDF_ID_METADATA))) {
1309                                 struct udf_meta_data *mdata =
1310                                         &map->s_type_specific.s_metadata;
1311                                 struct metadataPartitionMap *mdm =
1312                                                 (struct metadataPartitionMap *)
1313                                                 &(lvd->partitionMaps[offset]);
1314                                 udf_debug("Parsing Logical vol part %d "
1315                                         "type %d  id=%s\n", i, type,
1316                                         UDF_ID_METADATA);
1317
1318                                 map->s_partition_type = UDF_METADATA_MAP25;
1319                                 map->s_partition_func = udf_get_pblock_meta25;
1320
1321                                 mdata->s_meta_file_loc   =
1322                                         le32_to_cpu(mdm->metadataFileLoc);
1323                                 mdata->s_mirror_file_loc =
1324                                         le32_to_cpu(mdm->metadataMirrorFileLoc);
1325                                 mdata->s_bitmap_file_loc =
1326                                         le32_to_cpu(mdm->metadataBitmapFileLoc);
1327                                 mdata->s_alloc_unit_size =
1328                                         le32_to_cpu(mdm->allocUnitSize);
1329                                 mdata->s_align_unit_size =
1330                                         le16_to_cpu(mdm->alignUnitSize);
1331                                 mdata->s_dup_md_flag     =
1332                                         mdm->flags & 0x01;
1333
1334                                 udf_debug("Metadata Ident suffix=0x%x\n",
1335                                         (le16_to_cpu(
1336                                          ((__le16 *)
1337                                               mdm->partIdent.identSuffix)[0])));
1338                                 udf_debug("Metadata part num=%d\n",
1339                                         le16_to_cpu(mdm->partitionNum));
1340                                 udf_debug("Metadata part alloc unit size=%d\n",
1341                                         le32_to_cpu(mdm->allocUnitSize));
1342                                 udf_debug("Metadata file loc=%d\n",
1343                                         le32_to_cpu(mdm->metadataFileLoc));
1344                                 udf_debug("Mirror file loc=%d\n",
1345                                        le32_to_cpu(mdm->metadataMirrorFileLoc));
1346                                 udf_debug("Bitmap file loc=%d\n",
1347                                        le32_to_cpu(mdm->metadataBitmapFileLoc));
1348                                 udf_debug("Duplicate Flag: %d %d\n",
1349                                         mdata->s_dup_md_flag, mdm->flags);
1350                         } else {
1351                                 udf_debug("Unknown ident: %s\n",
1352                                           upm2->partIdent.ident);
1353                                 continue;
1354                         }
1355                         map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1356                         map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1357                 }
1358                 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1359                           i, map->s_partition_num, type,
1360                           map->s_volumeseqnum);
1361         }
1362
1363         if (fileset) {
1364                 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
1365
1366                 *fileset = lelb_to_cpu(la->extLocation);
1367                 udf_debug("FileSet found in LogicalVolDesc at block=%d, "
1368                           "partition=%d\n", fileset->logicalBlockNum,
1369                           fileset->partitionReferenceNum);
1370         }
1371         if (lvd->integritySeqExt.extLength)
1372                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1373
1374 out_bh:
1375         brelse(bh);
1376         return ret;
1377 }
1378
1379 /*
1380  * udf_load_logicalvolint
1381  *
1382  */
1383 static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
1384 {
1385         struct buffer_head *bh = NULL;
1386         uint16_t ident;
1387         struct udf_sb_info *sbi = UDF_SB(sb);
1388         struct logicalVolIntegrityDesc *lvid;
1389
1390         while (loc.extLength > 0 &&
1391                (bh = udf_read_tagged(sb, loc.extLocation,
1392                                      loc.extLocation, &ident)) &&
1393                ident == TAG_IDENT_LVID) {
1394                 sbi->s_lvid_bh = bh;
1395                 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1396
1397                 if (lvid->nextIntegrityExt.extLength)
1398                         udf_load_logicalvolint(sb,
1399                                 leea_to_cpu(lvid->nextIntegrityExt));
1400
1401                 if (sbi->s_lvid_bh != bh)
1402                         brelse(bh);
1403                 loc.extLength -= sb->s_blocksize;
1404                 loc.extLocation++;
1405         }
1406         if (sbi->s_lvid_bh != bh)
1407                 brelse(bh);
1408 }
1409
1410 /*
1411  * udf_process_sequence
1412  *
1413  * PURPOSE
1414  *      Process a main/reserve volume descriptor sequence.
1415  *
1416  * PRE-CONDITIONS
1417  *      sb                      Pointer to _locked_ superblock.
1418  *      block                   First block of first extent of the sequence.
1419  *      lastblock               Lastblock of first extent of the sequence.
1420  *
1421  * HISTORY
1422  *      July 1, 1997 - Andrew E. Mileski
1423  *      Written, tested, and released.
1424  */
1425 static noinline int udf_process_sequence(struct super_block *sb, long block,
1426                                 long lastblock, struct kernel_lb_addr *fileset)
1427 {
1428         struct buffer_head *bh = NULL;
1429         struct udf_vds_record vds[VDS_POS_LENGTH];
1430         struct udf_vds_record *curr;
1431         struct generic_desc *gd;
1432         struct volDescPtr *vdp;
1433         int done = 0;
1434         uint32_t vdsn;
1435         uint16_t ident;
1436         long next_s = 0, next_e = 0;
1437
1438         memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1439
1440         /*
1441          * Read the main descriptor sequence and find which descriptors
1442          * are in it.
1443          */
1444         for (; (!done && block <= lastblock); block++) {
1445
1446                 bh = udf_read_tagged(sb, block, block, &ident);
1447                 if (!bh) {
1448                         printk(KERN_ERR "udf: Block %Lu of volume descriptor "
1449                                "sequence is corrupted or we could not read "
1450                                "it.\n", (unsigned long long)block);
1451                         return 1;
1452                 }
1453
1454                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1455                 gd = (struct generic_desc *)bh->b_data;
1456                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1457                 switch (ident) {
1458                 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1459                         curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1460                         if (vdsn >= curr->volDescSeqNum) {
1461                                 curr->volDescSeqNum = vdsn;
1462                                 curr->block = block;
1463                         }
1464                         break;
1465                 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1466                         curr = &vds[VDS_POS_VOL_DESC_PTR];
1467                         if (vdsn >= curr->volDescSeqNum) {
1468                                 curr->volDescSeqNum = vdsn;
1469                                 curr->block = block;
1470
1471                                 vdp = (struct volDescPtr *)bh->b_data;
1472                                 next_s = le32_to_cpu(
1473                                         vdp->nextVolDescSeqExt.extLocation);
1474                                 next_e = le32_to_cpu(
1475                                         vdp->nextVolDescSeqExt.extLength);
1476                                 next_e = next_e >> sb->s_blocksize_bits;
1477                                 next_e += next_s;
1478                         }
1479                         break;
1480                 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1481                         curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1482                         if (vdsn >= curr->volDescSeqNum) {
1483                                 curr->volDescSeqNum = vdsn;
1484                                 curr->block = block;
1485                         }
1486                         break;
1487                 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1488                         curr = &vds[VDS_POS_PARTITION_DESC];
1489                         if (!curr->block)
1490                                 curr->block = block;
1491                         break;
1492                 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1493                         curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1494                         if (vdsn >= curr->volDescSeqNum) {
1495                                 curr->volDescSeqNum = vdsn;
1496                                 curr->block = block;
1497                         }
1498                         break;
1499                 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1500                         curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1501                         if (vdsn >= curr->volDescSeqNum) {
1502                                 curr->volDescSeqNum = vdsn;
1503                                 curr->block = block;
1504                         }
1505                         break;
1506                 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1507                         vds[VDS_POS_TERMINATING_DESC].block = block;
1508                         if (next_e) {
1509                                 block = next_s;
1510                                 lastblock = next_e;
1511                                 next_s = next_e = 0;
1512                         } else
1513                                 done = 1;
1514                         break;
1515                 }
1516                 brelse(bh);
1517         }
1518         /*
1519          * Now read interesting descriptors again and process them
1520          * in a suitable order
1521          */
1522         if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1523                 printk(KERN_ERR "udf: Primary Volume Descriptor not found!\n");
1524                 return 1;
1525         }
1526         if (udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block))
1527                 return 1;
1528
1529         if (vds[VDS_POS_LOGICAL_VOL_DESC].block && udf_load_logicalvol(sb,
1530             vds[VDS_POS_LOGICAL_VOL_DESC].block, fileset))
1531                 return 1;
1532
1533         if (vds[VDS_POS_PARTITION_DESC].block) {
1534                 /*
1535                  * We rescan the whole descriptor sequence to find
1536                  * partition descriptor blocks and process them.
1537                  */
1538                 for (block = vds[VDS_POS_PARTITION_DESC].block;
1539                      block < vds[VDS_POS_TERMINATING_DESC].block;
1540                      block++)
1541                         if (udf_load_partdesc(sb, block))
1542                                 return 1;
1543         }
1544
1545         return 0;
1546 }
1547
1548 static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh,
1549                              struct kernel_lb_addr *fileset)
1550 {
1551         struct anchorVolDescPtr *anchor;
1552         long main_s, main_e, reserve_s, reserve_e;
1553         struct udf_sb_info *sbi;
1554
1555         sbi = UDF_SB(sb);
1556         anchor = (struct anchorVolDescPtr *)bh->b_data;
1557
1558         /* Locate the main sequence */
1559         main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1560         main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1561         main_e = main_e >> sb->s_blocksize_bits;
1562         main_e += main_s;
1563
1564         /* Locate the reserve sequence */
1565         reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1566         reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1567         reserve_e = reserve_e >> sb->s_blocksize_bits;
1568         reserve_e += reserve_s;
1569
1570         /* Process the main & reserve sequences */
1571         /* responsible for finding the PartitionDesc(s) */
1572         if (!udf_process_sequence(sb, main_s, main_e, fileset))
1573                 return 1;
1574         return !udf_process_sequence(sb, reserve_s, reserve_e, fileset);
1575 }
1576
1577 /*
1578  * Check whether there is an anchor block in the given block and
1579  * load Volume Descriptor Sequence if so.
1580  */
1581 static int udf_check_anchor_block(struct super_block *sb, sector_t block,
1582                                   struct kernel_lb_addr *fileset)
1583 {
1584         struct buffer_head *bh;
1585         uint16_t ident;
1586         int ret;
1587
1588         if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
1589             udf_fixed_to_variable(block) >=
1590             sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits)
1591                 return 0;
1592
1593         bh = udf_read_tagged(sb, block, block, &ident);
1594         if (!bh)
1595                 return 0;
1596         if (ident != TAG_IDENT_AVDP) {
1597                 brelse(bh);
1598                 return 0;
1599         }
1600         ret = udf_load_sequence(sb, bh, fileset);
1601         brelse(bh);
1602         return ret;
1603 }
1604
1605 /* Search for an anchor volume descriptor pointer */
1606 static sector_t udf_scan_anchors(struct super_block *sb, sector_t lastblock,
1607                                  struct kernel_lb_addr *fileset)
1608 {
1609         sector_t last[6];
1610         int i;
1611         struct udf_sb_info *sbi = UDF_SB(sb);
1612         int last_count = 0;
1613
1614         /* First try user provided anchor */
1615         if (sbi->s_anchor) {
1616                 if (udf_check_anchor_block(sb, sbi->s_anchor, fileset))
1617                         return lastblock;
1618         }
1619         /*
1620          * according to spec, anchor is in either:
1621          *     block 256
1622          *     lastblock-256
1623          *     lastblock
1624          *  however, if the disc isn't closed, it could be 512.
1625          */
1626         if (udf_check_anchor_block(sb, sbi->s_session + 256, fileset))
1627                 return lastblock;
1628         /*
1629          * The trouble is which block is the last one. Drives often misreport
1630          * this so we try various possibilities.
1631          */
1632         last[last_count++] = lastblock;
1633         if (lastblock >= 1)
1634                 last[last_count++] = lastblock - 1;
1635         last[last_count++] = lastblock + 1;
1636         if (lastblock >= 2)
1637                 last[last_count++] = lastblock - 2;
1638         if (lastblock >= 150)
1639                 last[last_count++] = lastblock - 150;
1640         if (lastblock >= 152)
1641                 last[last_count++] = lastblock - 152;
1642
1643         for (i = 0; i < last_count; i++) {
1644                 if (last[i] >= sb->s_bdev->bd_inode->i_size >>
1645                                 sb->s_blocksize_bits)
1646                         continue;
1647                 if (udf_check_anchor_block(sb, last[i], fileset))
1648                         return last[i];
1649                 if (last[i] < 256)
1650                         continue;
1651                 if (udf_check_anchor_block(sb, last[i] - 256, fileset))
1652                         return last[i];
1653         }
1654
1655         /* Finally try block 512 in case media is open */
1656         if (udf_check_anchor_block(sb, sbi->s_session + 512, fileset))
1657                 return last[0];
1658         return 0;
1659 }
1660
1661 /*
1662  * Find an anchor volume descriptor and load Volume Descriptor Sequence from
1663  * area specified by it. The function expects sbi->s_lastblock to be the last
1664  * block on the media.
1665  *
1666  * Return 1 if ok, 0 if not found.
1667  *
1668  */
1669 static int udf_find_anchor(struct super_block *sb,
1670                            struct kernel_lb_addr *fileset)
1671 {
1672         sector_t lastblock;
1673         struct udf_sb_info *sbi = UDF_SB(sb);
1674
1675         lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1676         if (lastblock)
1677                 goto out;
1678
1679         /* No anchor found? Try VARCONV conversion of block numbers */
1680         UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
1681         /* Firstly, we try to not convert number of the last block */
1682         lastblock = udf_scan_anchors(sb,
1683                                 udf_variable_to_fixed(sbi->s_last_block),
1684                                 fileset);
1685         if (lastblock)
1686                 goto out;
1687
1688         /* Secondly, we try with converted number of the last block */
1689         lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1690         if (!lastblock) {
1691                 /* VARCONV didn't help. Clear it. */
1692                 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
1693                 return 0;
1694         }
1695 out:
1696         sbi->s_last_block = lastblock;
1697         return 1;
1698 }
1699
1700 /*
1701  * Check Volume Structure Descriptor, find Anchor block and load Volume
1702  * Descriptor Sequence
1703  */
1704 static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
1705                         int silent, struct kernel_lb_addr *fileset)
1706 {
1707         struct udf_sb_info *sbi = UDF_SB(sb);
1708         loff_t nsr_off;
1709
1710         if (!sb_set_blocksize(sb, uopt->blocksize)) {
1711                 if (!silent)
1712                         printk(KERN_WARNING "UDF-fs: Bad block size\n");
1713                 return 0;
1714         }
1715         sbi->s_last_block = uopt->lastblock;
1716         if (!uopt->novrs) {
1717                 /* Check that it is NSR02 compliant */
1718                 nsr_off = udf_check_vsd(sb);
1719                 if (!nsr_off) {
1720                         if (!silent)
1721                                 printk(KERN_WARNING "UDF-fs: No VRS found\n");
1722                         return 0;
1723                 }
1724                 if (nsr_off == -1)
1725                         udf_debug("Failed to read byte 32768. Assuming open "
1726                                   "disc. Skipping validity check\n");
1727                 if (!sbi->s_last_block)
1728                         sbi->s_last_block = udf_get_last_block(sb);
1729         } else {
1730                 udf_debug("Validity check skipped because of novrs option\n");
1731         }
1732
1733         /* Look for anchor block and load Volume Descriptor Sequence */
1734         sbi->s_anchor = uopt->anchor;
1735         if (!udf_find_anchor(sb, fileset)) {
1736                 if (!silent)
1737                         printk(KERN_WARNING "UDF-fs: No anchor found\n");
1738                 return 0;
1739         }
1740         return 1;
1741 }
1742
1743 static void udf_open_lvid(struct super_block *sb)
1744 {
1745         struct udf_sb_info *sbi = UDF_SB(sb);
1746         struct buffer_head *bh = sbi->s_lvid_bh;
1747         struct logicalVolIntegrityDesc *lvid;
1748         struct logicalVolIntegrityDescImpUse *lvidiu;
1749
1750         if (!bh)
1751                 return;
1752         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1753         lvidiu = udf_sb_lvidiu(sbi);
1754
1755         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1756         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1757         udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
1758                                 CURRENT_TIME);
1759         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN);
1760
1761         lvid->descTag.descCRC = cpu_to_le16(
1762                 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1763                         le16_to_cpu(lvid->descTag.descCRCLength)));
1764
1765         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1766         mark_buffer_dirty(bh);
1767         sbi->s_lvid_dirty = 0;
1768 }
1769
1770 static void udf_close_lvid(struct super_block *sb)
1771 {
1772         struct udf_sb_info *sbi = UDF_SB(sb);
1773         struct buffer_head *bh = sbi->s_lvid_bh;
1774         struct logicalVolIntegrityDesc *lvid;
1775         struct logicalVolIntegrityDescImpUse *lvidiu;
1776
1777         if (!bh)
1778                 return;
1779
1780         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1781         lvidiu = udf_sb_lvidiu(sbi);
1782         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1783         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1784         udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
1785         if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1786                 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1787         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1788                 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1789         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
1790                 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
1791         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1792
1793         lvid->descTag.descCRC = cpu_to_le16(
1794                         crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1795                                 le16_to_cpu(lvid->descTag.descCRCLength)));
1796
1797         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1798         mark_buffer_dirty(bh);
1799         sbi->s_lvid_dirty = 0;
1800 }
1801
1802 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
1803 {
1804         int i;
1805         int nr_groups = bitmap->s_nr_groups;
1806         int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
1807                                                 nr_groups);
1808
1809         for (i = 0; i < nr_groups; i++)
1810                 if (bitmap->s_block_bitmap[i])
1811                         brelse(bitmap->s_block_bitmap[i]);
1812
1813         if (size <= PAGE_SIZE)
1814                 kfree(bitmap);
1815         else
1816                 vfree(bitmap);
1817 }
1818
1819 static void udf_free_partition(struct udf_part_map *map)
1820 {
1821         int i;
1822         struct udf_meta_data *mdata;
1823
1824         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1825                 iput(map->s_uspace.s_table);
1826         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1827                 iput(map->s_fspace.s_table);
1828         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1829                 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
1830         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1831                 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
1832         if (map->s_partition_type == UDF_SPARABLE_MAP15)
1833                 for (i = 0; i < 4; i++)
1834                         brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
1835         else if (map->s_partition_type == UDF_METADATA_MAP25) {
1836                 mdata = &map->s_type_specific.s_metadata;
1837                 iput(mdata->s_metadata_fe);
1838                 mdata->s_metadata_fe = NULL;
1839
1840                 iput(mdata->s_mirror_fe);
1841                 mdata->s_mirror_fe = NULL;
1842
1843                 iput(mdata->s_bitmap_fe);
1844                 mdata->s_bitmap_fe = NULL;
1845         }
1846 }
1847
1848 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1849 {
1850         int i;
1851         int ret;
1852         struct inode *inode = NULL;
1853         struct udf_options uopt;
1854         struct kernel_lb_addr rootdir, fileset;
1855         struct udf_sb_info *sbi;
1856
1857         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1858         uopt.uid = -1;
1859         uopt.gid = -1;
1860         uopt.umask = 0;
1861         uopt.fmode = UDF_INVALID_MODE;
1862         uopt.dmode = UDF_INVALID_MODE;
1863
1864         sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1865         if (!sbi)
1866                 return -ENOMEM;
1867
1868         sb->s_fs_info = sbi;
1869
1870         mutex_init(&sbi->s_alloc_mutex);
1871
1872         if (!udf_parse_options((char *)options, &uopt, false))
1873                 goto error_out;
1874
1875         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1876             uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
1877                 udf_error(sb, "udf_read_super",
1878                           "utf8 cannot be combined with iocharset\n");
1879                 goto error_out;
1880         }
1881 #ifdef CONFIG_UDF_NLS
1882         if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1883                 uopt.nls_map = load_nls_default();
1884                 if (!uopt.nls_map)
1885                         uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1886                 else
1887                         udf_debug("Using default NLS map\n");
1888         }
1889 #endif
1890         if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1891                 uopt.flags |= (1 << UDF_FLAG_UTF8);
1892
1893         fileset.logicalBlockNum = 0xFFFFFFFF;
1894         fileset.partitionReferenceNum = 0xFFFF;
1895
1896         sbi->s_flags = uopt.flags;
1897         sbi->s_uid = uopt.uid;
1898         sbi->s_gid = uopt.gid;
1899         sbi->s_umask = uopt.umask;
1900         sbi->s_fmode = uopt.fmode;
1901         sbi->s_dmode = uopt.dmode;
1902         sbi->s_nls_map = uopt.nls_map;
1903
1904         if (uopt.session == 0xFFFFFFFF)
1905                 sbi->s_session = udf_get_last_session(sb);
1906         else
1907                 sbi->s_session = uopt.session;
1908
1909         udf_debug("Multi-session=%d\n", sbi->s_session);
1910
1911         /* Fill in the rest of the superblock */
1912         sb->s_op = &udf_sb_ops;
1913         sb->s_export_op = &udf_export_ops;
1914         sb->dq_op = NULL;
1915         sb->s_dirt = 0;
1916         sb->s_magic = UDF_SUPER_MAGIC;
1917         sb->s_time_gran = 1000;
1918
1919         if (uopt.flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) {
1920                 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1921         } else {
1922                 uopt.blocksize = bdev_logical_block_size(sb->s_bdev);
1923                 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1924                 if (!ret && uopt.blocksize != UDF_DEFAULT_BLOCKSIZE) {
1925                         if (!silent)
1926                                 printk(KERN_NOTICE
1927                                        "UDF-fs: Rescanning with blocksize "
1928                                        "%d\n", UDF_DEFAULT_BLOCKSIZE);
1929                         uopt.blocksize = UDF_DEFAULT_BLOCKSIZE;
1930                         ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1931                 }
1932         }
1933         if (!ret) {
1934                 printk(KERN_WARNING "UDF-fs: No partition found (1)\n");
1935                 goto error_out;
1936         }
1937
1938         udf_debug("Lastblock=%d\n", sbi->s_last_block);
1939
1940         if (sbi->s_lvid_bh) {
1941                 struct logicalVolIntegrityDescImpUse *lvidiu =
1942                                                         udf_sb_lvidiu(sbi);
1943                 uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
1944                 uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
1945                 /* uint16_t maxUDFWriteRev =
1946                                 le16_to_cpu(lvidiu->maxUDFWriteRev); */
1947
1948                 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
1949                         printk(KERN_ERR "UDF-fs: minUDFReadRev=%x "
1950                                         "(max is %x)\n",
1951                                le16_to_cpu(lvidiu->minUDFReadRev),
1952                                UDF_MAX_READ_VERSION);
1953                         goto error_out;
1954                 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
1955                         sb->s_flags |= MS_RDONLY;
1956
1957                 sbi->s_udfrev = minUDFWriteRev;
1958
1959                 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1960                         UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
1961                 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
1962                         UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
1963         }
1964
1965         if (!sbi->s_partitions) {
1966                 printk(KERN_WARNING "UDF-fs: No partition found (2)\n");
1967                 goto error_out;
1968         }
1969
1970         if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
1971                         UDF_PART_FLAG_READ_ONLY) {
1972                 printk(KERN_NOTICE "UDF-fs: Partition marked readonly; "
1973                                    "forcing readonly mount\n");
1974                 sb->s_flags |= MS_RDONLY;
1975         }
1976
1977         if (udf_find_fileset(sb, &fileset, &rootdir)) {
1978                 printk(KERN_WARNING "UDF-fs: No fileset found\n");
1979                 goto error_out;
1980         }
1981
1982         if (!silent) {
1983                 struct timestamp ts;
1984                 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
1985                 udf_info("UDF: Mounting volume '%s', "
1986                          "timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
1987                          sbi->s_volume_ident, le16_to_cpu(ts.year), ts.month, ts.day,
1988                          ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
1989         }
1990         if (!(sb->s_flags & MS_RDONLY))
1991                 udf_open_lvid(sb);
1992
1993         /* Assign the root inode */
1994         /* assign inodes by physical block number */
1995         /* perhaps it's not extensible enough, but for now ... */
1996         inode = udf_iget(sb, &rootdir);
1997         if (!inode) {
1998                 printk(KERN_ERR "UDF-fs: Error in udf_iget, block=%d, "
1999                                 "partition=%d\n",
2000                        rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
2001                 goto error_out;
2002         }
2003
2004         /* Allocate a dentry for the root inode */
2005         sb->s_root = d_alloc_root(inode);
2006         if (!sb->s_root) {
2007                 printk(KERN_ERR "UDF-fs: Couldn't allocate root dentry\n");
2008                 iput(inode);
2009                 goto error_out;
2010         }
2011         sb->s_maxbytes = MAX_LFS_FILESIZE;
2012         return 0;
2013
2014 error_out:
2015         if (sbi->s_vat_inode)
2016                 iput(sbi->s_vat_inode);
2017         if (sbi->s_partitions)
2018                 for (i = 0; i < sbi->s_partitions; i++)
2019                         udf_free_partition(&sbi->s_partmaps[i]);
2020 #ifdef CONFIG_UDF_NLS
2021         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2022                 unload_nls(sbi->s_nls_map);
2023 #endif
2024         if (!(sb->s_flags & MS_RDONLY))
2025                 udf_close_lvid(sb);
2026         brelse(sbi->s_lvid_bh);
2027
2028         kfree(sbi->s_partmaps);
2029         kfree(sbi);
2030         sb->s_fs_info = NULL;
2031
2032         return -EINVAL;
2033 }
2034
2035 static void udf_error(struct super_block *sb, const char *function,
2036                       const char *fmt, ...)
2037 {
2038         va_list args;
2039
2040         if (!(sb->s_flags & MS_RDONLY)) {
2041                 /* mark sb error */
2042                 sb->s_dirt = 1;
2043         }
2044         va_start(args, fmt);
2045         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2046         va_end(args);
2047         printk(KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
2048                 sb->s_id, function, error_buf);
2049 }
2050
2051 void udf_warning(struct super_block *sb, const char *function,
2052                  const char *fmt, ...)
2053 {
2054         va_list args;
2055
2056         va_start(args, fmt);
2057         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2058         va_end(args);
2059         printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
2060                sb->s_id, function, error_buf);
2061 }
2062
2063 static void udf_put_super(struct super_block *sb)
2064 {
2065         int i;
2066         struct udf_sb_info *sbi;
2067
2068         sbi = UDF_SB(sb);
2069
2070         lock_kernel();
2071
2072         if (sbi->s_vat_inode)
2073                 iput(sbi->s_vat_inode);
2074         if (sbi->s_partitions)
2075                 for (i = 0; i < sbi->s_partitions; i++)
2076                         udf_free_partition(&sbi->s_partmaps[i]);
2077 #ifdef CONFIG_UDF_NLS
2078         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2079                 unload_nls(sbi->s_nls_map);
2080 #endif
2081         if (!(sb->s_flags & MS_RDONLY))
2082                 udf_close_lvid(sb);
2083         brelse(sbi->s_lvid_bh);
2084         kfree(sbi->s_partmaps);
2085         kfree(sb->s_fs_info);
2086         sb->s_fs_info = NULL;
2087
2088         unlock_kernel();
2089 }
2090
2091 static int udf_sync_fs(struct super_block *sb, int wait)
2092 {
2093         struct udf_sb_info *sbi = UDF_SB(sb);
2094
2095         mutex_lock(&sbi->s_alloc_mutex);
2096         if (sbi->s_lvid_dirty) {
2097                 /*
2098                  * Blockdevice will be synced later so we don't have to submit
2099                  * the buffer for IO
2100                  */
2101                 mark_buffer_dirty(sbi->s_lvid_bh);
2102                 sb->s_dirt = 0;
2103                 sbi->s_lvid_dirty = 0;
2104         }
2105         mutex_unlock(&sbi->s_alloc_mutex);
2106
2107         return 0;
2108 }
2109
2110 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
2111 {
2112         struct super_block *sb = dentry->d_sb;
2113         struct udf_sb_info *sbi = UDF_SB(sb);
2114         struct logicalVolIntegrityDescImpUse *lvidiu;
2115         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
2116
2117         if (sbi->s_lvid_bh != NULL)
2118                 lvidiu = udf_sb_lvidiu(sbi);
2119         else
2120                 lvidiu = NULL;
2121
2122         buf->f_type = UDF_SUPER_MAGIC;
2123         buf->f_bsize = sb->s_blocksize;
2124         buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
2125         buf->f_bfree = udf_count_free(sb);
2126         buf->f_bavail = buf->f_bfree;
2127         buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2128                                           le32_to_cpu(lvidiu->numDirs)) : 0)
2129                         + buf->f_bfree;
2130         buf->f_ffree = buf->f_bfree;
2131         buf->f_namelen = UDF_NAME_LEN - 2;
2132         buf->f_fsid.val[0] = (u32)id;
2133         buf->f_fsid.val[1] = (u32)(id >> 32);
2134
2135         return 0;
2136 }
2137
2138 static unsigned int udf_count_free_bitmap(struct super_block *sb,
2139                                           struct udf_bitmap *bitmap)
2140 {
2141         struct buffer_head *bh = NULL;
2142         unsigned int accum = 0;
2143         int index;
2144         int block = 0, newblock;
2145         struct kernel_lb_addr loc;
2146         uint32_t bytes;
2147         uint8_t *ptr;
2148         uint16_t ident;
2149         struct spaceBitmapDesc *bm;
2150
2151         lock_kernel();
2152
2153         loc.logicalBlockNum = bitmap->s_extPosition;
2154         loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
2155         bh = udf_read_ptagged(sb, &loc, 0, &ident);
2156
2157         if (!bh) {
2158                 printk(KERN_ERR "udf: udf_count_free failed\n");
2159                 goto out;
2160         } else if (ident != TAG_IDENT_SBD) {
2161                 brelse(bh);
2162                 printk(KERN_ERR "udf: udf_count_free failed\n");
2163                 goto out;
2164         }
2165
2166         bm = (struct spaceBitmapDesc *)bh->b_data;
2167         bytes = le32_to_cpu(bm->numOfBytes);
2168         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2169         ptr = (uint8_t *)bh->b_data;
2170
2171         while (bytes > 0) {
2172                 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2173                 accum += bitmap_weight((const unsigned long *)(ptr + index),
2174                                         cur_bytes * 8);
2175                 bytes -= cur_bytes;
2176                 if (bytes) {
2177                         brelse(bh);
2178                         newblock = udf_get_lb_pblock(sb, &loc, ++block);
2179                         bh = udf_tread(sb, newblock);
2180                         if (!bh) {
2181                                 udf_debug("read failed\n");
2182                                 goto out;
2183                         }
2184                         index = 0;
2185                         ptr = (uint8_t *)bh->b_data;
2186                 }
2187         }
2188         brelse(bh);
2189
2190 out:
2191         unlock_kernel();
2192
2193         return accum;
2194 }
2195
2196 static unsigned int udf_count_free_table(struct super_block *sb,
2197                                          struct inode *table)
2198 {
2199         unsigned int accum = 0;
2200         uint32_t elen;
2201         struct kernel_lb_addr eloc;
2202         int8_t etype;
2203         struct extent_position epos;
2204
2205         lock_kernel();
2206
2207         epos.block = UDF_I(table)->i_location;
2208         epos.offset = sizeof(struct unallocSpaceEntry);
2209         epos.bh = NULL;
2210
2211         while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2212                 accum += (elen >> table->i_sb->s_blocksize_bits);
2213
2214         brelse(epos.bh);
2215
2216         unlock_kernel();
2217
2218         return accum;
2219 }
2220
2221 static unsigned int udf_count_free(struct super_block *sb)
2222 {
2223         unsigned int accum = 0;
2224         struct udf_sb_info *sbi;
2225         struct udf_part_map *map;
2226
2227         sbi = UDF_SB(sb);
2228         if (sbi->s_lvid_bh) {
2229                 struct logicalVolIntegrityDesc *lvid =
2230                         (struct logicalVolIntegrityDesc *)
2231                         sbi->s_lvid_bh->b_data;
2232                 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
2233                         accum = le32_to_cpu(
2234                                         lvid->freeSpaceTable[sbi->s_partition]);
2235                         if (accum == 0xFFFFFFFF)
2236                                 accum = 0;
2237                 }
2238         }
2239
2240         if (accum)
2241                 return accum;
2242
2243         map = &sbi->s_partmaps[sbi->s_partition];
2244         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2245                 accum += udf_count_free_bitmap(sb,
2246                                                map->s_uspace.s_bitmap);
2247         }
2248         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
2249                 accum += udf_count_free_bitmap(sb,
2250                                                map->s_fspace.s_bitmap);
2251         }
2252         if (accum)
2253                 return accum;
2254
2255         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2256                 accum += udf_count_free_table(sb,
2257                                               map->s_uspace.s_table);
2258         }
2259         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
2260                 accum += udf_count_free_table(sb,
2261                                               map->s_fspace.s_table);
2262         }
2263
2264         return accum;
2265 }