fs/udf/super.c

   1 /*
   2  * super.c
   3  *
   4  * PURPOSE
   5  *  Super block routines for the OSTA-UDF(tm) filesystem.
   6  *
   7  * DESCRIPTION
   8  *  OSTA-UDF(tm) = Optical Storage Technology Association
   9  *  Universal Disk Format.
  10  *
  11  *  This code is based on version 2.00 of the UDF specification,
  12  *  and revision 3 of the ECMA 167 standard [equivalent to ISO 13346].
  13  *    http://www.osta.org/
  14  *    http://www.ecma.ch/
  15  *    http://www.iso.org/
  16  *
  17  * COPYRIGHT
  18  *  This file is distributed under the terms of the GNU General Public
  19  *  License (GPL). Copies of the GPL can be obtained from:
  20  *    ftp://prep.ai.mit.edu/pub/gnu/GPL
  21  *  Each contributing author retains all rights to their own work.
  22  *
  23  *  (C) 1998 Dave Boynton
  24  *  (C) 1998-2004 Ben Fennema
  25  *  (C) 2000 Stelias Computing Inc
  26  *
  27  * HISTORY
  28  *
  29  *  09/24/98 dgb  changed to allow compiling outside of kernel, and
  30  *                added some debugging.
  31  *  10/01/98 dgb  updated to allow (some) possibility of compiling w/2.0.34
  32  *  10/16/98      attempting some multi-session support
  33  *  10/17/98      added freespace count for "df"
  34  *  11/11/98 gr   added novrs option
  35  *  11/26/98 dgb  added fileset,anchor mount options
  36  *  12/06/98 blf  really hosed things royally. vat/sparing support. sequenced
  37  *                vol descs. rewrote option handling based on isofs
  38  *  12/20/98      find the free space bitmap (if it exists)
  39  */
  40
  41 #include "udfdecl.h"
  42
  43 #include <linux/blkdev.h>
  44 #include <linux/slab.h>
  45 #include <linux/kernel.h>
  46 #include <linux/module.h>
  47 #include <linux/parser.h>
  48 #include <linux/stat.h>
  49 #include <linux/cdrom.h>
  50 #include <linux/nls.h>
  51 #include <linux/smp_lock.h>
  52 #include <linux/buffer_head.h>
  53 #include <linux/vfs.h>
  54 #include <linux/vmalloc.h>
  55 #include <linux/errno.h>
  56 #include <linux/mount.h>
  57 #include <linux/seq_file.h>
  58 #include <linux/bitmap.h>
  59 #include <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 struct dentry *udf_mount(struct file_system_type *fs_type,
 111                       int flags, const char *dev_name, void *data)
 112 {
 113         return mount_bdev(fs_type, flags, dev_name, data, udf_fill_super);
 114 }
 115
 116 static struct file_system_type udf_fstype = {
 117         .owner          = THIS_MODULE,
 118         .name           = "udf",
 119         .mount          = udf_mount,
 120         .kill_sb        = kill_block_super,
 121         .fs_flags       = FS_REQUIRES_DEV,
 122 };
 123
 124 static struct kmem_cache *udf_inode_cachep;
 125
 126 static struct inode *udf_alloc_inode(struct super_block *sb)
 127 {
 128         struct udf_inode_info *ei;
 129         ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
 130         if (!ei)
 131                 return NULL;
 132
 133         ei->i_unique = 0;
 134         ei->i_lenExtents = 0;
 135         ei->i_next_alloc_block = 0;
 136         ei->i_next_alloc_goal = 0;
 137         ei->i_strat4096 = 0;
 138
 139         return &ei->vfs_inode;
 140 }
 141
 142 static void udf_destroy_inode(struct inode *inode)
 143 {
 144         kmem_cache_free(udf_inode_cachep, UDF_I(inode));
 145 }
 146
 147 static void init_once(void *foo)
 148 {
 149         struct udf_inode_info *ei = (struct udf_inode_info *)foo;
 150
 151         ei->i_ext.i_data = NULL;
 152         inode_init_once(&ei->vfs_inode);
 153 }
 154
 155 static int init_inodecache(void)
 156 {
 157         udf_inode_cachep = kmem_cache_create("udf_inode_cache",
 158                                              sizeof(struct udf_inode_info),
 159                                              0, (SLAB_RECLAIM_ACCOUNT |
 160                                                  SLAB_MEM_SPREAD),
 161                                              init_once);
 162         if (!udf_inode_cachep)
 163                 return -ENOMEM;
 164         return 0;
 165 }
 166
 167 static void destroy_inodecache(void)
 168 {
 169         kmem_cache_destroy(udf_inode_cachep);
 170 }
 171
 172 /* Superblock operations */
 173 static const struct super_operations udf_sb_ops = {
 174         .alloc_inode    = udf_alloc_inode,
 175         .destroy_inode  = udf_destroy_inode,
 176         .write_inode    = udf_write_inode,
 177         .evict_inode    = udf_evict_inode,
 178         .put_super      = udf_put_super,
 179         .sync_fs        = udf_sync_fs,
 180         .statfs         = udf_statfs,
 181         .remount_fs     = udf_remount_fs,
 182         .show_options   = udf_show_options,
 183 };
 184
 185 struct udf_options {
 186         unsigned char novrs;
 187         unsigned int blocksize;
 188         unsigned int session;
 189         unsigned int lastblock;
 190         unsigned int anchor;
 191         unsigned int volume;
 192         unsigned short partition;
 193         unsigned int fileset;
 194         unsigned int rootdir;
 195         unsigned int flags;
 196         mode_t umask;
 197         gid_t gid;
 198         uid_t uid;
 199         mode_t fmode;
 200         mode_t dmode;
 201         struct nls_table *nls_map;
 202 };
 203
 204 static int __init init_udf_fs(void)
 205 {
 206         int err;
 207
 208         err = init_inodecache();
 209         if (err)
 210                 goto out1;
 211         err = register_filesystem(&udf_fstype);
 212         if (err)
 213                 goto out;
 214
 215         return 0;
 216
 217 out:
 218         destroy_inodecache();
 219
 220 out1:
 221         return err;
 222 }
 223
 224 static void __exit exit_udf_fs(void)
 225 {
 226         unregister_filesystem(&udf_fstype);
 227         destroy_inodecache();
 228 }
 229
 230 module_init(init_udf_fs)
 231 module_exit(exit_udf_fs)
 232
 233 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
 234 {
 235         struct udf_sb_info *sbi = UDF_SB(sb);
 236
 237         sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map),
 238                                   GFP_KERNEL);
 239         if (!sbi->s_partmaps) {
 240                 udf_error(sb, __func__,
 241                           "Unable to allocate space for %d partition maps",
 242                           count);
 243                 sbi->s_partitions = 0;
 244                 return -ENOMEM;
 245         }
 246
 247         sbi->s_partitions = count;
 248         return 0;
 249 }
 250
 251 static int udf_show_options(struct seq_file *seq, struct vfsmount *mnt)
 252 {
 253         struct super_block *sb = mnt->mnt_sb;
 254         struct udf_sb_info *sbi = UDF_SB(sb);
 255
 256         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
 257                 seq_puts(seq, ",nostrict");
 258         if (UDF_QUERY_FLAG(sb, UDF_FLAG_BLOCKSIZE_SET))
 259                 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
 260         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
 261                 seq_puts(seq, ",unhide");
 262         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
 263                 seq_puts(seq, ",undelete");
 264         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
 265                 seq_puts(seq, ",noadinicb");
 266         if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
 267                 seq_puts(seq, ",shortad");
 268         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
 269                 seq_puts(seq, ",uid=forget");
 270         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_IGNORE))
 271                 seq_puts(seq, ",uid=ignore");
 272         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
 273                 seq_puts(seq, ",gid=forget");
 274         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE))
 275                 seq_puts(seq, ",gid=ignore");
 276         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
 277                 seq_printf(seq, ",uid=%u", sbi->s_uid);
 278         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
 279                 seq_printf(seq, ",gid=%u", sbi->s_gid);
 280         if (sbi->s_umask != 0)
 281                 seq_printf(seq, ",umask=%o", sbi->s_umask);
 282         if (sbi->s_fmode != UDF_INVALID_MODE)
 283                 seq_printf(seq, ",mode=%o", sbi->s_fmode);
 284         if (sbi->s_dmode != UDF_INVALID_MODE)
 285                 seq_printf(seq, ",dmode=%o", sbi->s_dmode);
 286         if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
 287                 seq_printf(seq, ",session=%u", sbi->s_session);
 288         if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
 289                 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
 290         if (sbi->s_anchor != 0)
 291                 seq_printf(seq, ",anchor=%u", sbi->s_anchor);
 292         /*
 293          * volume, partition, fileset and rootdir seem to be ignored
 294          * currently
 295          */
 296         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
 297                 seq_puts(seq, ",utf8");
 298         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
 299                 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
 300
 301         return 0;
 302 }
 303
 304 /*
 305  * udf_parse_options
 306  *
 307  * PURPOSE
 308  *      Parse mount options.
 309  *
 310  * DESCRIPTION
 311  *      The following mount options are supported:
 312  *
 313  *      gid=            Set the default group.
 314  *      umask=          Set the default umask.
 315  *      mode=           Set the default file permissions.
 316  *      dmode=          Set the default directory permissions.
 317  *      uid=            Set the default user.
 318  *      bs=             Set the block size.
 319  *      unhide          Show otherwise hidden files.
 320  *      undelete        Show deleted files in lists.
 321  *      adinicb         Embed data in the inode (default)
 322  *      noadinicb       Don't embed data in the inode
 323  *      shortad         Use short ad's
 324  *      longad          Use long ad's (default)
 325  *      nostrict        Unset strict conformance
 326  *      iocharset=      Set the NLS character set
 327  *
 328  *      The remaining are for debugging and disaster recovery:
 329  *
 330  *      novrs           Skip volume sequence recognition
 331  *
 332  *      The following expect a offset from 0.
 333  *
 334  *      session=        Set the CDROM session (default= last session)
 335  *      anchor=         Override standard anchor location. (default= 256)
 336  *      volume=         Override the VolumeDesc location. (unused)
 337  *      partition=      Override the PartitionDesc location. (unused)
 338  *      lastblock=      Set the last block of the filesystem/
 339  *
 340  *      The following expect a offset from the partition root.
 341  *
 342  *      fileset=        Override the fileset block location. (unused)
 343  *      rootdir=        Override the root directory location. (unused)
 344  *              WARNING: overriding the rootdir to a non-directory may
 345  *              yield highly unpredictable results.
 346  *
 347  * PRE-CONDITIONS
 348  *      options         Pointer to mount options string.
 349  *      uopts           Pointer to mount options variable.
 350  *
 351  * POST-CONDITIONS
 352  *      <return>        1       Mount options parsed okay.
 353  *      <return>        0       Error parsing mount options.
 354  *
 355  * HISTORY
 356  *      July 1, 1997 - Andrew E. Mileski
 357  *      Written, tested, and released.
 358  */
 359
 360 enum {
 361         Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
 362         Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
 363         Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
 364         Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
 365         Opt_rootdir, Opt_utf8, Opt_iocharset,
 366         Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore,
 367         Opt_fmode, Opt_dmode
 368 };
 369
 370 static const match_table_t tokens = {
 371         {Opt_novrs,     "novrs"},
 372         {Opt_nostrict,  "nostrict"},
 373         {Opt_bs,        "bs=%u"},
 374         {Opt_unhide,    "unhide"},
 375         {Opt_undelete,  "undelete"},
 376         {Opt_noadinicb, "noadinicb"},
 377         {Opt_adinicb,   "adinicb"},
 378         {Opt_shortad,   "shortad"},
 379         {Opt_longad,    "longad"},
 380         {Opt_uforget,   "uid=forget"},
 381         {Opt_uignore,   "uid=ignore"},
 382         {Opt_gforget,   "gid=forget"},
 383         {Opt_gignore,   "gid=ignore"},
 384         {Opt_gid,       "gid=%u"},
 385         {Opt_uid,       "uid=%u"},
 386         {Opt_umask,     "umask=%o"},
 387         {Opt_session,   "session=%u"},
 388         {Opt_lastblock, "lastblock=%u"},
 389         {Opt_anchor,    "anchor=%u"},
 390         {Opt_volume,    "volume=%u"},
 391         {Opt_partition, "partition=%u"},
 392         {Opt_fileset,   "fileset=%u"},
 393         {Opt_rootdir,   "rootdir=%u"},
 394         {Opt_utf8,      "utf8"},
 395         {Opt_iocharset, "iocharset=%s"},
 396         {Opt_fmode,     "mode=%o"},
 397         {Opt_dmode,     "dmode=%o"},
 398         {Opt_err,       NULL}
 399 };
 400
 401 static int udf_parse_options(char *options, struct udf_options *uopt,
 402                              bool remount)
 403 {
 404         char *p;
 405         int option;
 406
 407         uopt->novrs = 0;
 408         uopt->partition = 0xFFFF;
 409         uopt->session = 0xFFFFFFFF;
 410         uopt->lastblock = 0;
 411         uopt->anchor = 0;
 412         uopt->volume = 0xFFFFFFFF;
 413         uopt->rootdir = 0xFFFFFFFF;
 414         uopt->fileset = 0xFFFFFFFF;
 415         uopt->nls_map = NULL;
 416
 417         if (!options)
 418                 return 1;
 419
 420         while ((p = strsep(&options, ",")) != NULL) {
 421                 substring_t args[MAX_OPT_ARGS];
 422                 int token;
 423                 if (!*p)
 424                         continue;
 425
 426                 token = match_token(p, tokens, args);
 427                 switch (token) {
 428                 case Opt_novrs:
 429                         uopt->novrs = 1;
 430                         break;
 431                 case Opt_bs:
 432                         if (match_int(&args[0], &option))
 433                                 return 0;
 434                         uopt->blocksize = option;
 435                         uopt->flags |= (1 << UDF_FLAG_BLOCKSIZE_SET);
 436                         break;
 437                 case Opt_unhide:
 438                         uopt->flags |= (1 << UDF_FLAG_UNHIDE);
 439                         break;
 440                 case Opt_undelete:
 441                         uopt->flags |= (1 << UDF_FLAG_UNDELETE);
 442                         break;
 443                 case Opt_noadinicb:
 444                         uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
 445                         break;
 446                 case Opt_adinicb:
 447                         uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
 448                         break;
 449                 case Opt_shortad:
 450                         uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
 451                         break;
 452                 case Opt_longad:
 453                         uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
 454                         break;
 455                 case Opt_gid:
 456                         if (match_int(args, &option))
 457                                 return 0;
 458                         uopt->gid = option;
 459                         uopt->flags |= (1 << UDF_FLAG_GID_SET);
 460                         break;
 461                 case Opt_uid:
 462                         if (match_int(args, &option))
 463                                 return 0;
 464                         uopt->uid = option;
 465                         uopt->flags |= (1 << UDF_FLAG_UID_SET);
 466                         break;
 467                 case Opt_umask:
 468                         if (match_octal(args, &option))
 469                                 return 0;
 470                         uopt->umask = option;
 471                         break;
 472                 case Opt_nostrict:
 473                         uopt->flags &= ~(1 << UDF_FLAG_STRICT);
 474                         break;
 475                 case Opt_session:
 476                         if (match_int(args, &option))
 477                                 return 0;
 478                         uopt->session = option;
 479                         if (!remount)
 480                                 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
 481                         break;
 482                 case Opt_lastblock:
 483                         if (match_int(args, &option))
 484                                 return 0;
 485                         uopt->lastblock = option;
 486                         if (!remount)
 487                                 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
 488                         break;
 489                 case Opt_anchor:
 490                         if (match_int(args, &option))
 491                                 return 0;
 492                         uopt->anchor = option;
 493                         break;
 494                 case Opt_volume:
 495                         if (match_int(args, &option))
 496                                 return 0;
 497                         uopt->volume = option;
 498                         break;
 499                 case Opt_partition:
 500                         if (match_int(args, &option))
 501                                 return 0;
 502                         uopt->partition = option;
 503                         break;
 504                 case Opt_fileset:
 505                         if (match_int(args, &option))
 506                                 return 0;
 507                         uopt->fileset = option;
 508                         break;
 509                 case Opt_rootdir:
 510                         if (match_int(args, &option))
 511                                 return 0;
 512                         uopt->rootdir = option;
 513                         break;
 514                 case Opt_utf8:
 515                         uopt->flags |= (1 << UDF_FLAG_UTF8);
 516                         break;
 517 #ifdef CONFIG_UDF_NLS
 518                 case Opt_iocharset:
 519                         uopt->nls_map = load_nls(args[0].from);
 520                         uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
 521                         break;
 522 #endif
 523                 case Opt_uignore:
 524                         uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
 525                         break;
 526                 case Opt_uforget:
 527                         uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
 528                         break;
 529                 case Opt_gignore:
 530                         uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
 531                         break;
 532                 case Opt_gforget:
 533                         uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
 534                         break;
 535                 case Opt_fmode:
 536                         if (match_octal(args, &option))
 537                                 return 0;
 538                         uopt->fmode = option & 0777;
 539                         break;
 540                 case Opt_dmode:
 541                         if (match_octal(args, &option))
 542                                 return 0;
 543                         uopt->dmode = option & 0777;
 544                         break;
 545                 default:
 546                         printk(KERN_ERR "udf: bad mount option \"%s\" "
 547                                "or missing value\n", p);
 548                         return 0;
 549                 }
 550         }
 551         return 1;
 552 }
 553
 554 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
 555 {
 556         struct udf_options uopt;
 557         struct udf_sb_info *sbi = UDF_SB(sb);
 558         int error = 0;
 559
 560         uopt.flags = sbi->s_flags;
 561         uopt.uid   = sbi->s_uid;
 562         uopt.gid   = sbi->s_gid;
 563         uopt.umask = sbi->s_umask;
 564         uopt.fmode = sbi->s_fmode;
 565         uopt.dmode = sbi->s_dmode;
 566
 567         if (!udf_parse_options(options, &uopt, true))
 568                 return -EINVAL;
 569
 570         lock_kernel();
 571         sbi->s_flags = uopt.flags;
 572         sbi->s_uid   = uopt.uid;
 573         sbi->s_gid   = uopt.gid;
 574         sbi->s_umask = uopt.umask;
 575         sbi->s_fmode = uopt.fmode;
 576         sbi->s_dmode = uopt.dmode;
 577
 578         if (sbi->s_lvid_bh) {
 579                 int write_rev = le16_to_cpu(udf_sb_lvidiu(sbi)->minUDFWriteRev);
 580                 if (write_rev > UDF_MAX_WRITE_VERSION)
 581                         *flags |= MS_RDONLY;
 582         }
 583
 584         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 585                 goto out_unlock;
 586
 587         if (*flags & MS_RDONLY)
 588                 udf_close_lvid(sb);
 589         else
 590                 udf_open_lvid(sb);
 591
 592 out_unlock:
 593         unlock_kernel();
 594         return error;
 595 }
 596
 597 /* Check Volume Structure Descriptors (ECMA 167 2/9.1) */
 598 /* We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
 599 static loff_t udf_check_vsd(struct super_block *sb)
 600 {
 601         struct volStructDesc *vsd = NULL;
 602         loff_t sector = 32768;
 603         int sectorsize;
 604         struct buffer_head *bh = NULL;
 605         int nsr02 = 0;
 606         int nsr03 = 0;
 607         struct udf_sb_info *sbi;
 608
 609         sbi = UDF_SB(sb);
 610         if (sb->s_blocksize < sizeof(struct volStructDesc))
 611                 sectorsize = sizeof(struct volStructDesc);
 612         else
 613                 sectorsize = sb->s_blocksize;
 614
 615         sector += (sbi->s_session << sb->s_blocksize_bits);
 616
 617         udf_debug("Starting at sector %u (%ld byte sectors)\n",
 618                   (unsigned int)(sector >> sb->s_blocksize_bits),
 619                   sb->s_blocksize);
 620         /* Process the sequence (if applicable) */
 621         for (; !nsr02 && !nsr03; sector += sectorsize) {
 622                 /* Read a block */
 623                 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
 624                 if (!bh)
 625                         break;
 626
 627                 /* Look for ISO  descriptors */
 628                 vsd = (struct volStructDesc *)(bh->b_data +
 629                                               (sector & (sb->s_blocksize - 1)));
 630
 631                 if (vsd->stdIdent[0] == 0) {
 632                         brelse(bh);
 633                         break;
 634                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
 635                                     VSD_STD_ID_LEN)) {
 636                         switch (vsd->structType) {
 637                         case 0:
 638                                 udf_debug("ISO9660 Boot Record found\n");
 639                                 break;
 640                         case 1:
 641                                 udf_debug("ISO9660 Primary Volume Descriptor "
 642                                           "found\n");
 643                                 break;
 644                         case 2:
 645                                 udf_debug("ISO9660 Supplementary Volume "
 646                                           "Descriptor found\n");
 647                                 break;
 648                         case 3:
 649                                 udf_debug("ISO9660 Volume Partition Descriptor "
 650                                           "found\n");
 651                                 break;
 652                         case 255:
 653                                 udf_debug("ISO9660 Volume Descriptor Set "
 654                                           "Terminator found\n");
 655                                 break;
 656                         default:
 657                                 udf_debug("ISO9660 VRS (%u) found\n",
 658                                           vsd->structType);
 659                                 break;
 660                         }
 661                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
 662                                     VSD_STD_ID_LEN))
 663                         ; /* nothing */
 664                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
 665                                     VSD_STD_ID_LEN)) {
 666                         brelse(bh);
 667                         break;
 668                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
 669                                     VSD_STD_ID_LEN))
 670                         nsr02 = sector;
 671                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
 672                                     VSD_STD_ID_LEN))
 673                         nsr03 = sector;
 674                 brelse(bh);
 675         }
 676
 677         if (nsr03)
 678                 return nsr03;
 679         else if (nsr02)
 680                 return nsr02;
 681         else if (sector - (sbi->s_session << sb->s_blocksize_bits) == 32768)
 682                 return -1;
 683         else
 684                 return 0;
 685 }
 686
 687 static int udf_find_fileset(struct super_block *sb,
 688                             struct kernel_lb_addr *fileset,
 689                             struct kernel_lb_addr *root)
 690 {
 691         struct buffer_head *bh = NULL;
 692         long lastblock;
 693         uint16_t ident;
 694         struct udf_sb_info *sbi;
 695
 696         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
 697             fileset->partitionReferenceNum != 0xFFFF) {
 698                 bh = udf_read_ptagged(sb, fileset, 0, &ident);
 699
 700                 if (!bh) {
 701                         return 1;
 702                 } else if (ident != TAG_IDENT_FSD) {
 703                         brelse(bh);
 704                         return 1;
 705                 }
 706
 707         }
 708
 709         sbi = UDF_SB(sb);
 710         if (!bh) {
 711                 /* Search backwards through the partitions */
 712                 struct kernel_lb_addr newfileset;
 713
 714 /* --> cvg: FIXME - is it reasonable? */
 715                 return 1;
 716
 717                 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
 718                      (newfileset.partitionReferenceNum != 0xFFFF &&
 719                       fileset->logicalBlockNum == 0xFFFFFFFF &&
 720                       fileset->partitionReferenceNum == 0xFFFF);
 721                      newfileset.partitionReferenceNum--) {
 722                         lastblock = sbi->s_partmaps
 723                                         [newfileset.partitionReferenceNum]
 724                                                 .s_partition_len;
 725                         newfileset.logicalBlockNum = 0;
 726
 727                         do {
 728                                 bh = udf_read_ptagged(sb, &newfileset, 0,
 729                                                       &ident);
 730                                 if (!bh) {
 731                                         newfileset.logicalBlockNum++;
 732                                         continue;
 733                                 }
 734
 735                                 switch (ident) {
 736                                 case TAG_IDENT_SBD:
 737                                 {
 738                                         struct spaceBitmapDesc *sp;
 739                                         sp = (struct spaceBitmapDesc *)
 740                                                                 bh->b_data;
 741                                         newfileset.logicalBlockNum += 1 +
 742                                                 ((le32_to_cpu(sp->numOfBytes) +
 743                                                   sizeof(struct spaceBitmapDesc)
 744                                                   - 1) >> sb->s_blocksize_bits);
 745                                         brelse(bh);
 746                                         break;
 747                                 }
 748                                 case TAG_IDENT_FSD:
 749                                         *fileset = newfileset;
 750                                         break;
 751                                 default:
 752                                         newfileset.logicalBlockNum++;
 753                                         brelse(bh);
 754                                         bh = NULL;
 755                                         break;
 756                                 }
 757                         } while (newfileset.logicalBlockNum < lastblock &&
 758                                  fileset->logicalBlockNum == 0xFFFFFFFF &&
 759                                  fileset->partitionReferenceNum == 0xFFFF);
 760                 }
 761         }
 762
 763         if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
 764              fileset->partitionReferenceNum != 0xFFFF) && bh) {
 765                 udf_debug("Fileset at block=%d, partition=%d\n",
 766                           fileset->logicalBlockNum,
 767                           fileset->partitionReferenceNum);
 768
 769                 sbi->s_partition = fileset->partitionReferenceNum;
 770                 udf_load_fileset(sb, bh, root);
 771                 brelse(bh);
 772                 return 0;
 773         }
 774         return 1;
 775 }
 776
 777 static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
 778 {
 779         struct primaryVolDesc *pvoldesc;
 780         struct ustr *instr, *outstr;
 781         struct buffer_head *bh;
 782         uint16_t ident;
 783         int ret = 1;
 784
 785         instr = kmalloc(sizeof(struct ustr), GFP_NOFS);
 786         if (!instr)
 787                 return 1;
 788
 789         outstr = kmalloc(sizeof(struct ustr), GFP_NOFS);
 790         if (!outstr)
 791                 goto out1;
 792
 793         bh = udf_read_tagged(sb, block, block, &ident);
 794         if (!bh)
 795                 goto out2;
 796
 797         BUG_ON(ident != TAG_IDENT_PVD);
 798
 799         pvoldesc = (struct primaryVolDesc *)bh->b_data;
 800
 801         if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
 802                               pvoldesc->recordingDateAndTime)) {
 803 #ifdef UDFFS_DEBUG
 804                 struct timestamp *ts = &pvoldesc->recordingDateAndTime;
 805                 udf_debug("recording time %04u/%02u/%02u"
 806                           " %02u:%02u (%x)\n",
 807                           le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
 808                           ts->minute, le16_to_cpu(ts->typeAndTimezone));
 809 #endif
 810         }
 811
 812         if (!udf_build_ustr(instr, pvoldesc->volIdent, 32))
 813                 if (udf_CS0toUTF8(outstr, instr)) {
 814                         strncpy(UDF_SB(sb)->s_volume_ident, outstr->u_name,
 815                                 outstr->u_len > 31 ? 31 : outstr->u_len);
 816                         udf_debug("volIdent[] = '%s'\n",
 817                                         UDF_SB(sb)->s_volume_ident);
 818                 }
 819
 820         if (!udf_build_ustr(instr, pvoldesc->volSetIdent, 128))
 821                 if (udf_CS0toUTF8(outstr, instr))
 822                         udf_debug("volSetIdent[] = '%s'\n", outstr->u_name);
 823
 824         brelse(bh);
 825         ret = 0;
 826 out2:
 827         kfree(outstr);
 828 out1:
 829         kfree(instr);
 830         return ret;
 831 }
 832
 833 static int udf_load_metadata_files(struct super_block *sb, int partition)
 834 {
 835         struct udf_sb_info *sbi = UDF_SB(sb);
 836         struct udf_part_map *map;
 837         struct udf_meta_data *mdata;
 838         struct kernel_lb_addr addr;
 839         int fe_error = 0;
 840
 841         map = &sbi->s_partmaps[partition];
 842         mdata = &map->s_type_specific.s_metadata;
 843
 844         /* metadata address */
 845         addr.logicalBlockNum =  mdata->s_meta_file_loc;
 846         addr.partitionReferenceNum = map->s_partition_num;
 847
 848         udf_debug("Metadata file location: block = %d part = %d\n",
 849                           addr.logicalBlockNum, addr.partitionReferenceNum);
 850
 851         mdata->s_metadata_fe = udf_iget(sb, &addr);
 852
 853         if (mdata->s_metadata_fe == NULL) {
 854                 udf_warning(sb, __func__, "metadata inode efe not found, "
 855                                 "will try mirror inode.");
 856                 fe_error = 1;
 857         } else if (UDF_I(mdata->s_metadata_fe)->i_alloc_type !=
 858                  ICBTAG_FLAG_AD_SHORT) {
 859                 udf_warning(sb, __func__, "metadata inode efe does not have "
 860                         "short allocation descriptors!");
 861                 fe_error = 1;
 862                 iput(mdata->s_metadata_fe);
 863                 mdata->s_metadata_fe = NULL;
 864         }
 865
 866         /* mirror file entry */
 867         addr.logicalBlockNum = mdata->s_mirror_file_loc;
 868         addr.partitionReferenceNum = map->s_partition_num;
 869
 870         udf_debug("Mirror metadata file location: block = %d part = %d\n",
 871                           addr.logicalBlockNum, addr.partitionReferenceNum);
 872
 873         mdata->s_mirror_fe = udf_iget(sb, &addr);
 874
 875         if (mdata->s_mirror_fe == NULL) {
 876                 if (fe_error) {
 877                         udf_error(sb, __func__, "mirror inode efe not found "
 878                         "and metadata inode is missing too, exiting...");
 879                         goto error_exit;
 880                 } else
 881                         udf_warning(sb, __func__, "mirror inode efe not found,"
 882                                         " but metadata inode is OK");
 883         } else if (UDF_I(mdata->s_mirror_fe)->i_alloc_type !=
 884                  ICBTAG_FLAG_AD_SHORT) {
 885                 udf_warning(sb, __func__, "mirror inode efe does not have "
 886                         "short allocation descriptors!");
 887                 iput(mdata->s_mirror_fe);
 888                 mdata->s_mirror_fe = NULL;
 889                 if (fe_error)
 890                         goto error_exit;
 891         }
 892
 893         /*
 894          * bitmap file entry
 895          * Note:
 896          * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
 897         */
 898         if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
 899                 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
 900                 addr.partitionReferenceNum = map->s_partition_num;
 901
 902                 udf_debug("Bitmap file location: block = %d part = %d\n",
 903                         addr.logicalBlockNum, addr.partitionReferenceNum);
 904
 905                 mdata->s_bitmap_fe = udf_iget(sb, &addr);
 906
 907                 if (mdata->s_bitmap_fe == NULL) {
 908                         if (sb->s_flags & MS_RDONLY)
 909                                 udf_warning(sb, __func__, "bitmap inode efe "
 910                                         "not found but it's ok since the disc"
 911                                         " is mounted read-only");
 912                         else {
 913                                 udf_error(sb, __func__, "bitmap inode efe not "
 914                                         "found and attempted read-write mount");
 915                                 goto error_exit;
 916                         }
 917                 }
 918         }
 919
 920         udf_debug("udf_load_metadata_files Ok\n");
 921
 922         return 0;
 923
 924 error_exit:
 925         return 1;
 926 }
 927
 928 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
 929                              struct kernel_lb_addr *root)
 930 {
 931         struct fileSetDesc *fset;
 932
 933         fset = (struct fileSetDesc *)bh->b_data;
 934
 935         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
 936
 937         UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
 938
 939         udf_debug("Rootdir at block=%d, partition=%d\n",
 940                   root->logicalBlockNum, root->partitionReferenceNum);
 941 }
 942
 943 int udf_compute_nr_groups(struct super_block *sb, u32 partition)
 944 {
 945         struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
 946         return DIV_ROUND_UP(map->s_partition_len +
 947                             (sizeof(struct spaceBitmapDesc) << 3),
 948                             sb->s_blocksize * 8);
 949 }
 950
 951 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
 952 {
 953         struct udf_bitmap *bitmap;
 954         int nr_groups;
 955         int size;
 956
 957         nr_groups = udf_compute_nr_groups(sb, index);
 958         size = sizeof(struct udf_bitmap) +
 959                 (sizeof(struct buffer_head *) * nr_groups);
 960
 961         if (size <= PAGE_SIZE)
 962                 bitmap = kzalloc(size, GFP_KERNEL);
 963         else
 964                 bitmap = vzalloc(size); /* TODO: get rid of vzalloc */
 965
 966         if (bitmap == NULL) {
 967                 udf_error(sb, __func__,
 968                           "Unable to allocate space for bitmap "
 969                           "and %d buffer_head pointers", nr_groups);
 970                 return NULL;
 971         }
 972
 973         bitmap->s_block_bitmap = (struct buffer_head **)(bitmap + 1);
 974         bitmap->s_nr_groups = nr_groups;
 975         return bitmap;
 976 }
 977
 978 static int udf_fill_partdesc_info(struct super_block *sb,
 979                 struct partitionDesc *p, int p_index)
 980 {
 981         struct udf_part_map *map;
 982         struct udf_sb_info *sbi = UDF_SB(sb);
 983         struct partitionHeaderDesc *phd;
 984
 985         map = &sbi->s_partmaps[p_index];
 986
 987         map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
 988         map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
 989
 990         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
 991                 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
 992         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
 993                 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
 994         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
 995                 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
 996         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
 997                 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
 998
 999         udf_debug("Partition (%d type %x) starts at physical %d, "
1000                   "block length %d\n", p_index,
1001                   map->s_partition_type, map->s_partition_root,
1002                   map->s_partition_len);
1003
1004         if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1005             strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
1006                 return 0;
1007
1008         phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1009         if (phd->unallocSpaceTable.extLength) {
1010                 struct kernel_lb_addr loc = {
1011                         .logicalBlockNum = le32_to_cpu(
1012                                 phd->unallocSpaceTable.extPosition),
1013                         .partitionReferenceNum = p_index,
1014                 };
1015
1016                 map->s_uspace.s_table = udf_iget(sb, &loc);
1017                 if (!map->s_uspace.s_table) {
1018                         udf_debug("cannot load unallocSpaceTable (part %d)\n",
1019                                         p_index);
1020                         return 1;
1021                 }
1022                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1023                 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
1024                                 p_index, map->s_uspace.s_table->i_ino);
1025         }
1026
1027         if (phd->unallocSpaceBitmap.extLength) {
1028                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1029                 if (!bitmap)
1030                         return 1;
1031                 map->s_uspace.s_bitmap = bitmap;
1032                 bitmap->s_extLength = le32_to_cpu(
1033                                 phd->unallocSpaceBitmap.extLength);
1034                 bitmap->s_extPosition = le32_to_cpu(
1035                                 phd->unallocSpaceBitmap.extPosition);
1036                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1037                 udf_debug("unallocSpaceBitmap (part %d) @ %d\n", p_index,
1038                                                 bitmap->s_extPosition);
1039         }
1040
1041         if (phd->partitionIntegrityTable.extLength)
1042                 udf_debug("partitionIntegrityTable (part %d)\n", p_index);
1043
1044         if (phd->freedSpaceTable.extLength) {
1045                 struct kernel_lb_addr loc = {
1046                         .logicalBlockNum = le32_to_cpu(
1047                                 phd->freedSpaceTable.extPosition),
1048                         .partitionReferenceNum = p_index,
1049                 };
1050
1051                 map->s_fspace.s_table = udf_iget(sb, &loc);
1052                 if (!map->s_fspace.s_table) {
1053                         udf_debug("cannot load freedSpaceTable (part %d)\n",
1054                                 p_index);
1055                         return 1;
1056                 }
1057
1058                 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
1059                 udf_debug("freedSpaceTable (part %d) @ %ld\n",
1060                                 p_index, map->s_fspace.s_table->i_ino);
1061         }
1062
1063         if (phd->freedSpaceBitmap.extLength) {
1064                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1065                 if (!bitmap)
1066                         return 1;
1067                 map->s_fspace.s_bitmap = bitmap;
1068                 bitmap->s_extLength = le32_to_cpu(
1069                                 phd->freedSpaceBitmap.extLength);
1070                 bitmap->s_extPosition = le32_to_cpu(
1071                                 phd->freedSpaceBitmap.extPosition);
1072                 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1073                 udf_debug("freedSpaceBitmap (part %d) @ %d\n", p_index,
1074                                         bitmap->s_extPosition);
1075         }
1076         return 0;
1077 }
1078
1079 static void udf_find_vat_block(struct super_block *sb, int p_index,
1080                                int type1_index, sector_t start_block)
1081 {
1082         struct udf_sb_info *sbi = UDF_SB(sb);
1083         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1084         sector_t vat_block;
1085         struct kernel_lb_addr ino;
1086
1087         /*
1088          * VAT file entry is in the last recorded block. Some broken disks have
1089          * it a few blocks before so try a bit harder...
1090          */
1091         ino.partitionReferenceNum = type1_index;
1092         for (vat_block = start_block;
1093              vat_block >= map->s_partition_root &&
1094              vat_block >= start_block - 3 &&
1095              !sbi->s_vat_inode; vat_block--) {
1096                 ino.logicalBlockNum = vat_block - map->s_partition_root;
1097                 sbi->s_vat_inode = udf_iget(sb, &ino);
1098         }
1099 }
1100
1101 static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1102 {
1103         struct udf_sb_info *sbi = UDF_SB(sb);
1104         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1105         struct buffer_head *bh = NULL;
1106         struct udf_inode_info *vati;
1107         uint32_t pos;
1108         struct virtualAllocationTable20 *vat20;
1109         sector_t blocks = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
1110
1111         udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block);
1112         if (!sbi->s_vat_inode &&
1113             sbi->s_last_block != blocks - 1) {
1114                 printk(KERN_NOTICE "UDF-fs: Failed to read VAT inode from the"
1115                        " last recorded block (%lu), retrying with the last "
1116                        "block of the device (%lu).\n",
1117                        (unsigned long)sbi->s_last_block,
1118                        (unsigned long)blocks - 1);
1119                 udf_find_vat_block(sb, p_index, type1_index, blocks - 1);
1120         }
1121         if (!sbi->s_vat_inode)
1122                 return 1;
1123
1124         if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1125                 map->s_type_specific.s_virtual.s_start_offset = 0;
1126                 map->s_type_specific.s_virtual.s_num_entries =
1127                         (sbi->s_vat_inode->i_size - 36) >> 2;
1128         } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1129                 vati = UDF_I(sbi->s_vat_inode);
1130                 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1131                         pos = udf_block_map(sbi->s_vat_inode, 0);
1132                         bh = sb_bread(sb, pos);
1133                         if (!bh)
1134                                 return 1;
1135                         vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1136                 } else {
1137                         vat20 = (struct virtualAllocationTable20 *)
1138                                                         vati->i_ext.i_data;
1139                 }
1140
1141                 map->s_type_specific.s_virtual.s_start_offset =
1142                         le16_to_cpu(vat20->lengthHeader);
1143                 map->s_type_specific.s_virtual.s_num_entries =
1144                         (sbi->s_vat_inode->i_size -
1145                                 map->s_type_specific.s_virtual.
1146                                         s_start_offset) >> 2;
1147                 brelse(bh);
1148         }
1149         return 0;
1150 }
1151
1152 static int udf_load_partdesc(struct super_block *sb, sector_t block)
1153 {
1154         struct buffer_head *bh;
1155         struct partitionDesc *p;
1156         struct udf_part_map *map;
1157         struct udf_sb_info *sbi = UDF_SB(sb);
1158         int i, type1_idx;
1159         uint16_t partitionNumber;
1160         uint16_t ident;
1161         int ret = 0;
1162
1163         bh = udf_read_tagged(sb, block, block, &ident);
1164         if (!bh)
1165                 return 1;
1166         if (ident != TAG_IDENT_PD)
1167                 goto out_bh;
1168
1169         p = (struct partitionDesc *)bh->b_data;
1170         partitionNumber = le16_to_cpu(p->partitionNumber);
1171
1172         /* First scan for TYPE1, SPARABLE and METADATA partitions */
1173         for (i = 0; i < sbi->s_partitions; i++) {
1174                 map = &sbi->s_partmaps[i];
1175                 udf_debug("Searching map: (%d == %d)\n",
1176                           map->s_partition_num, partitionNumber);
1177                 if (map->s_partition_num == partitionNumber &&
1178                     (map->s_partition_type == UDF_TYPE1_MAP15 ||
1179                      map->s_partition_type == UDF_SPARABLE_MAP15))
1180                         break;
1181         }
1182
1183         if (i >= sbi->s_partitions) {
1184                 udf_debug("Partition (%d) not found in partition map\n",
1185                           partitionNumber);
1186                 goto out_bh;
1187         }
1188
1189         ret = udf_fill_partdesc_info(sb, p, i);
1190
1191         /*
1192          * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1193          * PHYSICAL partitions are already set up
1194          */
1195         type1_idx = i;
1196         for (i = 0; i < sbi->s_partitions; i++) {
1197                 map = &sbi->s_partmaps[i];
1198
1199                 if (map->s_partition_num == partitionNumber &&
1200                     (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1201                      map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1202                      map->s_partition_type == UDF_METADATA_MAP25))
1203                         break;
1204         }
1205
1206         if (i >= sbi->s_partitions)
1207                 goto out_bh;
1208
1209         ret = udf_fill_partdesc_info(sb, p, i);
1210         if (ret)
1211                 goto out_bh;
1212
1213         if (map->s_partition_type == UDF_METADATA_MAP25) {
1214                 ret = udf_load_metadata_files(sb, i);
1215                 if (ret) {
1216                         printk(KERN_ERR "UDF-fs: error loading MetaData "
1217                         "partition map %d\n", i);
1218                         goto out_bh;
1219                 }
1220         } else {
1221                 ret = udf_load_vat(sb, i, type1_idx);
1222                 if (ret)
1223                         goto out_bh;
1224                 /*
1225                  * Mark filesystem read-only if we have a partition with
1226                  * virtual map since we don't handle writing to it (we
1227                  * overwrite blocks instead of relocating them).
1228                  */
1229                 sb->s_flags |= MS_RDONLY;
1230                 printk(KERN_NOTICE "UDF-fs: Filesystem marked read-only "
1231                         "because writing to pseudooverwrite partition is "
1232                         "not implemented.\n");
1233         }
1234 out_bh:
1235         /* In case loading failed, we handle cleanup in udf_fill_super */
1236         brelse(bh);
1237         return ret;
1238 }
1239
1240 static int udf_load_logicalvol(struct super_block *sb, sector_t block,
1241                                struct kernel_lb_addr *fileset)
1242 {
1243         struct logicalVolDesc *lvd;
1244         int i, j, offset;
1245         uint8_t type;
1246         struct udf_sb_info *sbi = UDF_SB(sb);
1247         struct genericPartitionMap *gpm;
1248         uint16_t ident;
1249         struct buffer_head *bh;
1250         int ret = 0;
1251
1252         bh = udf_read_tagged(sb, block, block, &ident);
1253         if (!bh)
1254                 return 1;
1255         BUG_ON(ident != TAG_IDENT_LVD);
1256         lvd = (struct logicalVolDesc *)bh->b_data;
1257
1258         i = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1259         if (i != 0) {
1260                 ret = i;
1261                 goto out_bh;
1262         }
1263
1264         for (i = 0, offset = 0;
1265              i < sbi->s_partitions && offset < le32_to_cpu(lvd->mapTableLength);
1266              i++, offset += gpm->partitionMapLength) {
1267                 struct udf_part_map *map = &sbi->s_partmaps[i];
1268                 gpm = (struct genericPartitionMap *)
1269                                 &(lvd->partitionMaps[offset]);
1270                 type = gpm->partitionMapType;
1271                 if (type == 1) {
1272                         struct genericPartitionMap1 *gpm1 =
1273                                 (struct genericPartitionMap1 *)gpm;
1274                         map->s_partition_type = UDF_TYPE1_MAP15;
1275                         map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1276                         map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1277                         map->s_partition_func = NULL;
1278                 } else if (type == 2) {
1279                         struct udfPartitionMap2 *upm2 =
1280                                                 (struct udfPartitionMap2 *)gpm;
1281                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1282                                                 strlen(UDF_ID_VIRTUAL))) {
1283                                 u16 suf =
1284                                         le16_to_cpu(((__le16 *)upm2->partIdent.
1285                                                         identSuffix)[0]);
1286                                 if (suf < 0x0200) {
1287                                         map->s_partition_type =
1288                                                         UDF_VIRTUAL_MAP15;
1289                                         map->s_partition_func =
1290                                                         udf_get_pblock_virt15;
1291                                 } else {
1292                                         map->s_partition_type =
1293                                                         UDF_VIRTUAL_MAP20;
1294                                         map->s_partition_func =
1295                                                         udf_get_pblock_virt20;
1296                                 }
1297                         } else if (!strncmp(upm2->partIdent.ident,
1298                                                 UDF_ID_SPARABLE,
1299                                                 strlen(UDF_ID_SPARABLE))) {
1300                                 uint32_t loc;
1301                                 struct sparingTable *st;
1302                                 struct sparablePartitionMap *spm =
1303                                         (struct sparablePartitionMap *)gpm;
1304
1305                                 map->s_partition_type = UDF_SPARABLE_MAP15;
1306                                 map->s_type_specific.s_sparing.s_packet_len =
1307                                                 le16_to_cpu(spm->packetLength);
1308                                 for (j = 0; j < spm->numSparingTables; j++) {
1309                                         struct buffer_head *bh2;
1310
1311                                         loc = le32_to_cpu(
1312                                                 spm->locSparingTable[j]);
1313                                         bh2 = udf_read_tagged(sb, loc, loc,
1314                                                              &ident);
1315                                         map->s_type_specific.s_sparing.
1316                                                         s_spar_map[j] = bh2;
1317
1318                                         if (bh2 == NULL)
1319                                                 continue;
1320
1321                                         st = (struct sparingTable *)bh2->b_data;
1322                                         if (ident != 0 || strncmp(
1323                                                 st->sparingIdent.ident,
1324                                                 UDF_ID_SPARING,
1325                                                 strlen(UDF_ID_SPARING))) {
1326                                                 brelse(bh2);
1327                                                 map->s_type_specific.s_sparing.
1328                                                         s_spar_map[j] = NULL;
1329                                         }
1330                                 }
1331                                 map->s_partition_func = udf_get_pblock_spar15;
1332                         } else if (!strncmp(upm2->partIdent.ident,
1333                                                 UDF_ID_METADATA,
1334                                                 strlen(UDF_ID_METADATA))) {
1335                                 struct udf_meta_data *mdata =
1336                                         &map->s_type_specific.s_metadata;
1337                                 struct metadataPartitionMap *mdm =
1338                                                 (struct metadataPartitionMap *)
1339                                                 &(lvd->partitionMaps[offset]);
1340                                 udf_debug("Parsing Logical vol part %d "
1341                                         "type %d  id=%s\n", i, type,
1342                                         UDF_ID_METADATA);
1343
1344                                 map->s_partition_type = UDF_METADATA_MAP25;
1345                                 map->s_partition_func = udf_get_pblock_meta25;
1346
1347                                 mdata->s_meta_file_loc   =
1348                                         le32_to_cpu(mdm->metadataFileLoc);
1349                                 mdata->s_mirror_file_loc =
1350                                         le32_to_cpu(mdm->metadataMirrorFileLoc);
1351                                 mdata->s_bitmap_file_loc =
1352                                         le32_to_cpu(mdm->metadataBitmapFileLoc);
1353                                 mdata->s_alloc_unit_size =
1354                                         le32_to_cpu(mdm->allocUnitSize);
1355                                 mdata->s_align_unit_size =
1356                                         le16_to_cpu(mdm->alignUnitSize);
1357                                 mdata->s_dup_md_flag     =
1358                                         mdm->flags & 0x01;
1359
1360                                 udf_debug("Metadata Ident suffix=0x%x\n",
1361                                         (le16_to_cpu(
1362                                          ((__le16 *)
1363                                               mdm->partIdent.identSuffix)[0])));
1364                                 udf_debug("Metadata part num=%d\n",
1365                                         le16_to_cpu(mdm->partitionNum));
1366                                 udf_debug("Metadata part alloc unit size=%d\n",
1367                                         le32_to_cpu(mdm->allocUnitSize));
1368                                 udf_debug("Metadata file loc=%d\n",
1369                                         le32_to_cpu(mdm->metadataFileLoc));
1370                                 udf_debug("Mirror file loc=%d\n",
1371                                        le32_to_cpu(mdm->metadataMirrorFileLoc));
1372                                 udf_debug("Bitmap file loc=%d\n",
1373                                        le32_to_cpu(mdm->metadataBitmapFileLoc));
1374                                 udf_debug("Duplicate Flag: %d %d\n",
1375                                         mdata->s_dup_md_flag, mdm->flags);
1376                         } else {
1377                                 udf_debug("Unknown ident: %s\n",
1378                                           upm2->partIdent.ident);
1379                                 continue;
1380                         }
1381                         map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1382                         map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1383                 }
1384                 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1385                           i, map->s_partition_num, type,
1386                           map->s_volumeseqnum);
1387         }
1388
1389         if (fileset) {
1390                 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
1391
1392                 *fileset = lelb_to_cpu(la->extLocation);
1393                 udf_debug("FileSet found in LogicalVolDesc at block=%d, "
1394                           "partition=%d\n", fileset->logicalBlockNum,
1395                           fileset->partitionReferenceNum);
1396         }
1397         if (lvd->integritySeqExt.extLength)
1398                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1399
1400 out_bh:
1401         brelse(bh);
1402         return ret;
1403 }
1404
1405 /*
1406  * udf_load_logicalvolint
1407  *
1408  */
1409 static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
1410 {
1411         struct buffer_head *bh = NULL;
1412         uint16_t ident;
1413         struct udf_sb_info *sbi = UDF_SB(sb);
1414         struct logicalVolIntegrityDesc *lvid;
1415
1416         while (loc.extLength > 0 &&
1417                (bh = udf_read_tagged(sb, loc.extLocation,
1418                                      loc.extLocation, &ident)) &&
1419                ident == TAG_IDENT_LVID) {
1420                 sbi->s_lvid_bh = bh;
1421                 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1422
1423                 if (lvid->nextIntegrityExt.extLength)
1424                         udf_load_logicalvolint(sb,
1425                                 leea_to_cpu(lvid->nextIntegrityExt));
1426
1427                 if (sbi->s_lvid_bh != bh)
1428                         brelse(bh);
1429                 loc.extLength -= sb->s_blocksize;
1430                 loc.extLocation++;
1431         }
1432         if (sbi->s_lvid_bh != bh)
1433                 brelse(bh);
1434 }
1435
1436 /*
1437  * udf_process_sequence
1438  *
1439  * PURPOSE
1440  *      Process a main/reserve volume descriptor sequence.
1441  *
1442  * PRE-CONDITIONS
1443  *      sb                      Pointer to _locked_ superblock.
1444  *      block                   First block of first extent of the sequence.
1445  *      lastblock               Lastblock of first extent of the sequence.
1446  *
1447  * HISTORY
1448  *      July 1, 1997 - Andrew E. Mileski
1449  *      Written, tested, and released.
1450  */
1451 static noinline int udf_process_sequence(struct super_block *sb, long block,
1452                                 long lastblock, struct kernel_lb_addr *fileset)
1453 {
1454         struct buffer_head *bh = NULL;
1455         struct udf_vds_record vds[VDS_POS_LENGTH];
1456         struct udf_vds_record *curr;
1457         struct generic_desc *gd;
1458         struct volDescPtr *vdp;
1459         int done = 0;
1460         uint32_t vdsn;
1461         uint16_t ident;
1462         long next_s = 0, next_e = 0;
1463
1464         memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1465
1466         /*
1467          * Read the main descriptor sequence and find which descriptors
1468          * are in it.
1469          */
1470         for (; (!done && block <= lastblock); block++) {
1471
1472                 bh = udf_read_tagged(sb, block, block, &ident);
1473                 if (!bh) {
1474                         printk(KERN_ERR "udf: Block %Lu of volume descriptor "
1475                                "sequence is corrupted or we could not read "
1476                                "it.\n", (unsigned long long)block);
1477                         return 1;
1478                 }
1479
1480                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1481                 gd = (struct generic_desc *)bh->b_data;
1482                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1483                 switch (ident) {
1484                 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1485                         curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1486                         if (vdsn >= curr->volDescSeqNum) {
1487                                 curr->volDescSeqNum = vdsn;
1488                                 curr->block = block;
1489                         }
1490                         break;
1491                 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1492                         curr = &vds[VDS_POS_VOL_DESC_PTR];
1493                         if (vdsn >= curr->volDescSeqNum) {
1494                                 curr->volDescSeqNum = vdsn;
1495                                 curr->block = block;
1496
1497                                 vdp = (struct volDescPtr *)bh->b_data;
1498                                 next_s = le32_to_cpu(
1499                                         vdp->nextVolDescSeqExt.extLocation);
1500                                 next_e = le32_to_cpu(
1501                                         vdp->nextVolDescSeqExt.extLength);
1502                                 next_e = next_e >> sb->s_blocksize_bits;
1503                                 next_e += next_s;
1504                         }
1505                         break;
1506                 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1507                         curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1508                         if (vdsn >= curr->volDescSeqNum) {
1509                                 curr->volDescSeqNum = vdsn;
1510                                 curr->block = block;
1511                         }
1512                         break;
1513                 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1514                         curr = &vds[VDS_POS_PARTITION_DESC];
1515                         if (!curr->block)
1516                                 curr->block = block;
1517                         break;
1518                 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1519                         curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1520                         if (vdsn >= curr->volDescSeqNum) {
1521                                 curr->volDescSeqNum = vdsn;
1522                                 curr->block = block;
1523                         }
1524                         break;
1525                 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1526                         curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1527                         if (vdsn >= curr->volDescSeqNum) {
1528                                 curr->volDescSeqNum = vdsn;
1529                                 curr->block = block;
1530                         }
1531                         break;
1532                 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1533                         vds[VDS_POS_TERMINATING_DESC].block = block;
1534                         if (next_e) {
1535                                 block = next_s;
1536                                 lastblock = next_e;
1537                                 next_s = next_e = 0;
1538                         } else
1539                                 done = 1;
1540                         break;
1541                 }
1542                 brelse(bh);
1543         }
1544         /*
1545          * Now read interesting descriptors again and process them
1546          * in a suitable order
1547          */
1548         if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1549                 printk(KERN_ERR "udf: Primary Volume Descriptor not found!\n");
1550                 return 1;
1551         }
1552         if (udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block))
1553                 return 1;
1554
1555         if (vds[VDS_POS_LOGICAL_VOL_DESC].block && udf_load_logicalvol(sb,
1556             vds[VDS_POS_LOGICAL_VOL_DESC].block, fileset))
1557                 return 1;
1558
1559         if (vds[VDS_POS_PARTITION_DESC].block) {
1560                 /*
1561                  * We rescan the whole descriptor sequence to find
1562                  * partition descriptor blocks and process them.
1563                  */
1564                 for (block = vds[VDS_POS_PARTITION_DESC].block;
1565                      block < vds[VDS_POS_TERMINATING_DESC].block;
1566                      block++)
1567                         if (udf_load_partdesc(sb, block))
1568                                 return 1;
1569         }
1570
1571         return 0;
1572 }
1573
1574 static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh,
1575                              struct kernel_lb_addr *fileset)
1576 {
1577         struct anchorVolDescPtr *anchor;
1578         long main_s, main_e, reserve_s, reserve_e;
1579
1580         anchor = (struct anchorVolDescPtr *)bh->b_data;
1581
1582         /* Locate the main sequence */
1583         main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1584         main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1585         main_e = main_e >> sb->s_blocksize_bits;
1586         main_e += main_s;
1587
1588         /* Locate the reserve sequence */
1589         reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1590         reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1591         reserve_e = reserve_e >> sb->s_blocksize_bits;
1592         reserve_e += reserve_s;
1593
1594         /* Process the main & reserve sequences */
1595         /* responsible for finding the PartitionDesc(s) */
1596         if (!udf_process_sequence(sb, main_s, main_e, fileset))
1597                 return 1;
1598         return !udf_process_sequence(sb, reserve_s, reserve_e, fileset);
1599 }
1600
1601 /*
1602  * Check whether there is an anchor block in the given block and
1603  * load Volume Descriptor Sequence if so.
1604  */
1605 static int udf_check_anchor_block(struct super_block *sb, sector_t block,
1606                                   struct kernel_lb_addr *fileset)
1607 {
1608         struct buffer_head *bh;
1609         uint16_t ident;
1610         int ret;
1611
1612         if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
1613             udf_fixed_to_variable(block) >=
1614             sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits)
1615                 return 0;
1616
1617         bh = udf_read_tagged(sb, block, block, &ident);
1618         if (!bh)
1619                 return 0;
1620         if (ident != TAG_IDENT_AVDP) {
1621                 brelse(bh);
1622                 return 0;
1623         }
1624         ret = udf_load_sequence(sb, bh, fileset);
1625         brelse(bh);
1626         return ret;
1627 }
1628
1629 /* Search for an anchor volume descriptor pointer */
1630 static sector_t udf_scan_anchors(struct super_block *sb, sector_t lastblock,
1631                                  struct kernel_lb_addr *fileset)
1632 {
1633         sector_t last[6];
1634         int i;
1635         struct udf_sb_info *sbi = UDF_SB(sb);
1636         int last_count = 0;
1637
1638         /* First try user provided anchor */
1639         if (sbi->s_anchor) {
1640                 if (udf_check_anchor_block(sb, sbi->s_anchor, fileset))
1641                         return lastblock;
1642         }
1643         /*
1644          * according to spec, anchor is in either:
1645          *     block 256
1646          *     lastblock-256
1647          *     lastblock
1648          *  however, if the disc isn't closed, it could be 512.
1649          */
1650         if (udf_check_anchor_block(sb, sbi->s_session + 256, fileset))
1651                 return lastblock;
1652         /*
1653          * The trouble is which block is the last one. Drives often misreport
1654          * this so we try various possibilities.
1655          */
1656         last[last_count++] = lastblock;
1657         if (lastblock >= 1)
1658                 last[last_count++] = lastblock - 1;
1659         last[last_count++] = lastblock + 1;
1660         if (lastblock >= 2)
1661                 last[last_count++] = lastblock - 2;
1662         if (lastblock >= 150)
1663                 last[last_count++] = lastblock - 150;
1664         if (lastblock >= 152)
1665                 last[last_count++] = lastblock - 152;
1666
1667         for (i = 0; i < last_count; i++) {
1668                 if (last[i] >= sb->s_bdev->bd_inode->i_size >>
1669                                 sb->s_blocksize_bits)
1670                         continue;
1671                 if (udf_check_anchor_block(sb, last[i], fileset))
1672                         return last[i];
1673                 if (last[i] < 256)
1674                         continue;
1675                 if (udf_check_anchor_block(sb, last[i] - 256, fileset))
1676                         return last[i];
1677         }
1678
1679         /* Finally try block 512 in case media is open */
1680         if (udf_check_anchor_block(sb, sbi->s_session + 512, fileset))
1681                 return last[0];
1682         return 0;
1683 }
1684
1685 /*
1686  * Find an anchor volume descriptor and load Volume Descriptor Sequence from
1687  * area specified by it. The function expects sbi->s_lastblock to be the last
1688  * block on the media.
1689  *
1690  * Return 1 if ok, 0 if not found.
1691  *
1692  */
1693 static int udf_find_anchor(struct super_block *sb,
1694                            struct kernel_lb_addr *fileset)
1695 {
1696         sector_t lastblock;
1697         struct udf_sb_info *sbi = UDF_SB(sb);
1698
1699         lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1700         if (lastblock)
1701                 goto out;
1702
1703         /* No anchor found? Try VARCONV conversion of block numbers */
1704         UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
1705         /* Firstly, we try to not convert number of the last block */
1706         lastblock = udf_scan_anchors(sb,
1707                                 udf_variable_to_fixed(sbi->s_last_block),
1708                                 fileset);
1709         if (lastblock)
1710                 goto out;
1711
1712         /* Secondly, we try with converted number of the last block */
1713         lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1714         if (!lastblock) {
1715                 /* VARCONV didn't help. Clear it. */
1716                 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
1717                 return 0;
1718         }
1719 out:
1720         sbi->s_last_block = lastblock;
1721         return 1;
1722 }
1723
1724 /*
1725  * Check Volume Structure Descriptor, find Anchor block and load Volume
1726  * Descriptor Sequence
1727  */
1728 static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
1729                         int silent, struct kernel_lb_addr *fileset)
1730 {
1731         struct udf_sb_info *sbi = UDF_SB(sb);
1732         loff_t nsr_off;
1733
1734         if (!sb_set_blocksize(sb, uopt->blocksize)) {
1735                 if (!silent)
1736                         printk(KERN_WARNING "UDF-fs: Bad block size\n");
1737                 return 0;
1738         }
1739         sbi->s_last_block = uopt->lastblock;
1740         if (!uopt->novrs) {
1741                 /* Check that it is NSR02 compliant */
1742                 nsr_off = udf_check_vsd(sb);
1743                 if (!nsr_off) {
1744                         if (!silent)
1745                                 printk(KERN_WARNING "UDF-fs: No VRS found\n");
1746                         return 0;
1747                 }
1748                 if (nsr_off == -1)
1749                         udf_debug("Failed to read byte 32768. Assuming open "
1750                                   "disc. Skipping validity check\n");
1751                 if (!sbi->s_last_block)
1752                         sbi->s_last_block = udf_get_last_block(sb);
1753         } else {
1754                 udf_debug("Validity check skipped because of novrs option\n");
1755         }
1756
1757         /* Look for anchor block and load Volume Descriptor Sequence */
1758         sbi->s_anchor = uopt->anchor;
1759         if (!udf_find_anchor(sb, fileset)) {
1760                 if (!silent)
1761                         printk(KERN_WARNING "UDF-fs: No anchor found\n");
1762                 return 0;
1763         }
1764         return 1;
1765 }
1766
1767 static void udf_open_lvid(struct super_block *sb)
1768 {
1769         struct udf_sb_info *sbi = UDF_SB(sb);
1770         struct buffer_head *bh = sbi->s_lvid_bh;
1771         struct logicalVolIntegrityDesc *lvid;
1772         struct logicalVolIntegrityDescImpUse *lvidiu;
1773
1774         if (!bh)
1775                 return;
1776         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1777         lvidiu = udf_sb_lvidiu(sbi);
1778
1779         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1780         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1781         udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
1782                                 CURRENT_TIME);
1783         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN);
1784
1785         lvid->descTag.descCRC = cpu_to_le16(
1786                 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1787                         le16_to_cpu(lvid->descTag.descCRCLength)));
1788
1789         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1790         mark_buffer_dirty(bh);
1791         sbi->s_lvid_dirty = 0;
1792 }
1793
1794 static void udf_close_lvid(struct super_block *sb)
1795 {
1796         struct udf_sb_info *sbi = UDF_SB(sb);
1797         struct buffer_head *bh = sbi->s_lvid_bh;
1798         struct logicalVolIntegrityDesc *lvid;
1799         struct logicalVolIntegrityDescImpUse *lvidiu;
1800
1801         if (!bh)
1802                 return;
1803
1804         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1805         lvidiu = udf_sb_lvidiu(sbi);
1806         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1807         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1808         udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
1809         if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1810                 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1811         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1812                 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1813         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
1814                 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
1815         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1816
1817         lvid->descTag.descCRC = cpu_to_le16(
1818                         crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1819                                 le16_to_cpu(lvid->descTag.descCRCLength)));
1820
1821         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1822         mark_buffer_dirty(bh);
1823         sbi->s_lvid_dirty = 0;
1824 }
1825
1826 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
1827 {
1828         int i;
1829         int nr_groups = bitmap->s_nr_groups;
1830         int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
1831                                                 nr_groups);
1832
1833         for (i = 0; i < nr_groups; i++)
1834                 if (bitmap->s_block_bitmap[i])
1835                         brelse(bitmap->s_block_bitmap[i]);
1836
1837         if (size <= PAGE_SIZE)
1838                 kfree(bitmap);
1839         else
1840                 vfree(bitmap);
1841 }
1842
1843 static void udf_free_partition(struct udf_part_map *map)
1844 {
1845         int i;
1846         struct udf_meta_data *mdata;
1847
1848         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1849                 iput(map->s_uspace.s_table);
1850         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1851                 iput(map->s_fspace.s_table);
1852         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1853                 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
1854         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1855                 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
1856         if (map->s_partition_type == UDF_SPARABLE_MAP15)
1857                 for (i = 0; i < 4; i++)
1858                         brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
1859         else if (map->s_partition_type == UDF_METADATA_MAP25) {
1860                 mdata = &map->s_type_specific.s_metadata;
1861                 iput(mdata->s_metadata_fe);
1862                 mdata->s_metadata_fe = NULL;
1863
1864                 iput(mdata->s_mirror_fe);
1865                 mdata->s_mirror_fe = NULL;
1866
1867                 iput(mdata->s_bitmap_fe);
1868                 mdata->s_bitmap_fe = NULL;
1869         }
1870 }
1871
1872 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1873 {
1874         int i;
1875         int ret;
1876         struct inode *inode = NULL;
1877         struct udf_options uopt;
1878         struct kernel_lb_addr rootdir, fileset;
1879         struct udf_sb_info *sbi;
1880
1881         lock_kernel();
1882
1883         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1884         uopt.uid = -1;
1885         uopt.gid = -1;
1886         uopt.umask = 0;
1887         uopt.fmode = UDF_INVALID_MODE;
1888         uopt.dmode = UDF_INVALID_MODE;
1889
1890         sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1891         if (!sbi) {
1892                 unlock_kernel();
1893                 return -ENOMEM;
1894         }
1895
1896         sb->s_fs_info = sbi;
1897
1898         mutex_init(&sbi->s_alloc_mutex);
1899
1900         if (!udf_parse_options((char *)options, &uopt, false))
1901                 goto error_out;
1902
1903         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1904             uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
1905                 udf_error(sb, "udf_read_super",
1906                           "utf8 cannot be combined with iocharset\n");
1907                 goto error_out;
1908         }
1909 #ifdef CONFIG_UDF_NLS
1910         if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1911                 uopt.nls_map = load_nls_default();
1912                 if (!uopt.nls_map)
1913                         uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1914                 else
1915                         udf_debug("Using default NLS map\n");
1916         }
1917 #endif
1918         if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1919                 uopt.flags |= (1 << UDF_FLAG_UTF8);
1920
1921         fileset.logicalBlockNum = 0xFFFFFFFF;
1922         fileset.partitionReferenceNum = 0xFFFF;
1923
1924         sbi->s_flags = uopt.flags;
1925         sbi->s_uid = uopt.uid;
1926         sbi->s_gid = uopt.gid;
1927         sbi->s_umask = uopt.umask;
1928         sbi->s_fmode = uopt.fmode;
1929         sbi->s_dmode = uopt.dmode;
1930         sbi->s_nls_map = uopt.nls_map;
1931
1932         if (uopt.session == 0xFFFFFFFF)
1933                 sbi->s_session = udf_get_last_session(sb);
1934         else
1935                 sbi->s_session = uopt.session;
1936
1937         udf_debug("Multi-session=%d\n", sbi->s_session);
1938
1939         /* Fill in the rest of the superblock */
1940         sb->s_op = &udf_sb_ops;
1941         sb->s_export_op = &udf_export_ops;
1942
1943         sb->s_dirt = 0;
1944         sb->s_magic = UDF_SUPER_MAGIC;
1945         sb->s_time_gran = 1000;
1946
1947         if (uopt.flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) {
1948                 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1949         } else {
1950                 uopt.blocksize = bdev_logical_block_size(sb->s_bdev);
1951                 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1952                 if (!ret && uopt.blocksize != UDF_DEFAULT_BLOCKSIZE) {
1953                         if (!silent)
1954                                 printk(KERN_NOTICE
1955                                        "UDF-fs: Rescanning with blocksize "
1956                                        "%d\n", UDF_DEFAULT_BLOCKSIZE);
1957                         uopt.blocksize = UDF_DEFAULT_BLOCKSIZE;
1958                         ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1959                 }
1960         }
1961         if (!ret) {
1962                 printk(KERN_WARNING "UDF-fs: No partition found (1)\n");
1963                 goto error_out;
1964         }
1965
1966         udf_debug("Lastblock=%d\n", sbi->s_last_block);
1967
1968         if (sbi->s_lvid_bh) {
1969                 struct logicalVolIntegrityDescImpUse *lvidiu =
1970                                                         udf_sb_lvidiu(sbi);
1971                 uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
1972                 uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
1973                 /* uint16_t maxUDFWriteRev =
1974                                 le16_to_cpu(lvidiu->maxUDFWriteRev); */
1975
1976                 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
1977                         printk(KERN_ERR "UDF-fs: minUDFReadRev=%x "
1978                                         "(max is %x)\n",
1979                                le16_to_cpu(lvidiu->minUDFReadRev),
1980                                UDF_MAX_READ_VERSION);
1981                         goto error_out;
1982                 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
1983                         sb->s_flags |= MS_RDONLY;
1984
1985                 sbi->s_udfrev = minUDFWriteRev;
1986
1987                 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1988                         UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
1989                 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
1990                         UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
1991         }
1992
1993         if (!sbi->s_partitions) {
1994                 printk(KERN_WARNING "UDF-fs: No partition found (2)\n");
1995                 goto error_out;
1996         }
1997
1998         if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
1999                         UDF_PART_FLAG_READ_ONLY) {
2000                 printk(KERN_NOTICE "UDF-fs: Partition marked readonly; "
2001                                    "forcing readonly mount\n");
2002                 sb->s_flags |= MS_RDONLY;
2003         }
2004
2005         if (udf_find_fileset(sb, &fileset, &rootdir)) {
2006                 printk(KERN_WARNING "UDF-fs: No fileset found\n");
2007                 goto error_out;
2008         }
2009
2010         if (!silent) {
2011                 struct timestamp ts;
2012                 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
2013                 udf_info("UDF: Mounting volume '%s', "
2014                          "timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
2015                          sbi->s_volume_ident, le16_to_cpu(ts.year), ts.month, ts.day,
2016                          ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
2017         }
2018         if (!(sb->s_flags & MS_RDONLY))
2019                 udf_open_lvid(sb);
2020
2021         /* Assign the root inode */
2022         /* assign inodes by physical block number */
2023         /* perhaps it's not extensible enough, but for now ... */
2024         inode = udf_iget(sb, &rootdir);
2025         if (!inode) {
2026                 printk(KERN_ERR "UDF-fs: Error in udf_iget, block=%d, "
2027                                 "partition=%d\n",
2028                        rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
2029                 goto error_out;
2030         }
2031
2032         /* Allocate a dentry for the root inode */
2033         sb->s_root = d_alloc_root(inode);
2034         if (!sb->s_root) {
2035                 printk(KERN_ERR "UDF-fs: Couldn't allocate root dentry\n");
2036                 iput(inode);
2037                 goto error_out;
2038         }
2039         sb->s_maxbytes = MAX_LFS_FILESIZE;
2040         unlock_kernel();
2041         return 0;
2042
2043 error_out:
2044         if (sbi->s_vat_inode)
2045                 iput(sbi->s_vat_inode);
2046         if (sbi->s_partitions)
2047                 for (i = 0; i < sbi->s_partitions; i++)
2048                         udf_free_partition(&sbi->s_partmaps[i]);
2049 #ifdef CONFIG_UDF_NLS
2050         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2051                 unload_nls(sbi->s_nls_map);
2052 #endif
2053         if (!(sb->s_flags & MS_RDONLY))
2054                 udf_close_lvid(sb);
2055         brelse(sbi->s_lvid_bh);
2056
2057         kfree(sbi->s_partmaps);
2058         kfree(sbi);
2059         sb->s_fs_info = NULL;
2060
2061         unlock_kernel();
2062         return -EINVAL;
2063 }
2064
2065 static void udf_error(struct super_block *sb, const char *function,
2066                       const char *fmt, ...)
2067 {
2068         va_list args;
2069
2070         if (!(sb->s_flags & MS_RDONLY)) {
2071                 /* mark sb error */
2072                 sb->s_dirt = 1;
2073         }
2074         va_start(args, fmt);
2075         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2076         va_end(args);
2077         printk(KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
2078                 sb->s_id, function, error_buf);
2079 }
2080
2081 void udf_warning(struct super_block *sb, const char *function,
2082                  const char *fmt, ...)
2083 {
2084         va_list args;
2085
2086         va_start(args, fmt);
2087         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2088         va_end(args);
2089         printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
2090                sb->s_id, function, error_buf);
2091 }
2092
2093 static void udf_put_super(struct super_block *sb)
2094 {
2095         int i;
2096         struct udf_sb_info *sbi;
2097
2098         sbi = UDF_SB(sb);
2099
2100         lock_kernel();
2101
2102         if (sbi->s_vat_inode)
2103                 iput(sbi->s_vat_inode);
2104         if (sbi->s_partitions)
2105                 for (i = 0; i < sbi->s_partitions; i++)
2106                         udf_free_partition(&sbi->s_partmaps[i]);
2107 #ifdef CONFIG_UDF_NLS
2108         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2109                 unload_nls(sbi->s_nls_map);
2110 #endif
2111         if (!(sb->s_flags & MS_RDONLY))
2112                 udf_close_lvid(sb);
2113         brelse(sbi->s_lvid_bh);
2114         kfree(sbi->s_partmaps);
2115         kfree(sb->s_fs_info);
2116         sb->s_fs_info = NULL;
2117
2118         unlock_kernel();
2119 }
2120
2121 static int udf_sync_fs(struct super_block *sb, int wait)
2122 {
2123         struct udf_sb_info *sbi = UDF_SB(sb);
2124
2125         mutex_lock(&sbi->s_alloc_mutex);
2126         if (sbi->s_lvid_dirty) {
2127                 /*
2128                  * Blockdevice will be synced later so we don't have to submit
2129                  * the buffer for IO
2130                  */
2131                 mark_buffer_dirty(sbi->s_lvid_bh);
2132                 sb->s_dirt = 0;
2133                 sbi->s_lvid_dirty = 0;
2134         }
2135         mutex_unlock(&sbi->s_alloc_mutex);
2136
2137         return 0;
2138 }
2139
2140 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
2141 {
2142         struct super_block *sb = dentry->d_sb;
2143         struct udf_sb_info *sbi = UDF_SB(sb);
2144         struct logicalVolIntegrityDescImpUse *lvidiu;
2145         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
2146
2147         if (sbi->s_lvid_bh != NULL)
2148                 lvidiu = udf_sb_lvidiu(sbi);
2149         else
2150                 lvidiu = NULL;
2151
2152         buf->f_type = UDF_SUPER_MAGIC;
2153         buf->f_bsize = sb->s_blocksize;
2154         buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
2155         buf->f_bfree = udf_count_free(sb);
2156         buf->f_bavail = buf->f_bfree;
2157         buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2158                                           le32_to_cpu(lvidiu->numDirs)) : 0)
2159                         + buf->f_bfree;
2160         buf->f_ffree = buf->f_bfree;
2161         buf->f_namelen = UDF_NAME_LEN - 2;
2162         buf->f_fsid.val[0] = (u32)id;
2163         buf->f_fsid.val[1] = (u32)(id >> 32);
2164
2165         return 0;
2166 }
2167
2168 static unsigned int udf_count_free_bitmap(struct super_block *sb,
2169                                           struct udf_bitmap *bitmap)
2170 {
2171         struct buffer_head *bh = NULL;
2172         unsigned int accum = 0;
2173         int index;
2174         int block = 0, newblock;
2175         struct kernel_lb_addr loc;
2176         uint32_t bytes;
2177         uint8_t *ptr;
2178         uint16_t ident;
2179         struct spaceBitmapDesc *bm;
2180
2181         lock_kernel();
2182
2183         loc.logicalBlockNum = bitmap->s_extPosition;
2184         loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
2185         bh = udf_read_ptagged(sb, &loc, 0, &ident);
2186
2187         if (!bh) {
2188                 printk(KERN_ERR "udf: udf_count_free failed\n");
2189                 goto out;
2190         } else if (ident != TAG_IDENT_SBD) {
2191                 brelse(bh);
2192                 printk(KERN_ERR "udf: udf_count_free failed\n");
2193                 goto out;
2194         }
2195
2196         bm = (struct spaceBitmapDesc *)bh->b_data;
2197         bytes = le32_to_cpu(bm->numOfBytes);
2198         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2199         ptr = (uint8_t *)bh->b_data;
2200
2201         while (bytes > 0) {
2202                 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2203                 accum += bitmap_weight((const unsigned long *)(ptr + index),
2204                                         cur_bytes * 8);
2205                 bytes -= cur_bytes;
2206                 if (bytes) {
2207                         brelse(bh);
2208                         newblock = udf_get_lb_pblock(sb, &loc, ++block);
2209                         bh = udf_tread(sb, newblock);
2210                         if (!bh) {
2211                                 udf_debug("read failed\n");
2212                                 goto out;
2213                         }
2214                         index = 0;
2215                         ptr = (uint8_t *)bh->b_data;
2216                 }
2217         }
2218         brelse(bh);
2219
2220 out:
2221         unlock_kernel();
2222
2223         return accum;
2224 }
2225
2226 static unsigned int udf_count_free_table(struct super_block *sb,
2227                                          struct inode *table)
2228 {
2229         unsigned int accum = 0;
2230         uint32_t elen;
2231         struct kernel_lb_addr eloc;
2232         int8_t etype;
2233         struct extent_position epos;
2234
2235         lock_kernel();
2236
2237         epos.block = UDF_I(table)->i_location;
2238         epos.offset = sizeof(struct unallocSpaceEntry);
2239         epos.bh = NULL;
2240
2241         while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2242                 accum += (elen >> table->i_sb->s_blocksize_bits);
2243
2244         brelse(epos.bh);
2245
2246         unlock_kernel();
2247
2248         return accum;
2249 }
2250
2251 static unsigned int udf_count_free(struct super_block *sb)
2252 {
2253         unsigned int accum = 0;
2254         struct udf_sb_info *sbi;
2255         struct udf_part_map *map;
2256
2257         sbi = UDF_SB(sb);
2258         if (sbi->s_lvid_bh) {
2259                 struct logicalVolIntegrityDesc *lvid =
2260                         (struct logicalVolIntegrityDesc *)
2261                         sbi->s_lvid_bh->b_data;
2262                 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
2263                         accum = le32_to_cpu(
2264                                         lvid->freeSpaceTable[sbi->s_partition]);
2265                         if (accum == 0xFFFFFFFF)
2266                                 accum = 0;
2267                 }
2268         }
2269
2270         if (accum)
2271                 return accum;
2272
2273         map = &sbi->s_partmaps[sbi->s_partition];
2274         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2275                 accum += udf_count_free_bitmap(sb,
2276                                                map->s_uspace.s_bitmap);
2277         }
2278         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
2279                 accum += udf_count_free_bitmap(sb,
2280                                                map->s_fspace.s_bitmap);
2281         }
2282         if (accum)
2283                 return accum;
2284
2285         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2286                 accum += udf_count_free_table(sb,
2287                                               map->s_uspace.s_table);
2288         }
2289         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
2290                 accum += udf_count_free_table(sb,
2291                                               map->s_fspace.s_table);
2292         }
2293
2294         return accum;
2295 }