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_i_callback(struct rcu_head *head)
 143 {
 144         struct inode *inode = container_of(head, struct inode, i_rcu);
 145         INIT_LIST_HEAD(&inode->i_dentry);
 146         kmem_cache_free(udf_inode_cachep, UDF_I(inode));
 147 }
 148
 149 static void udf_destroy_inode(struct inode *inode)
 150 {
 151         call_rcu(&inode->i_rcu, udf_i_callback);
 152 }
 153
 154 static void init_once(void *foo)
 155 {
 156         struct udf_inode_info *ei = (struct udf_inode_info *)foo;
 157
 158         ei->i_ext.i_data = NULL;
 159         inode_init_once(&ei->vfs_inode);
 160 }
 161
 162 static int init_inodecache(void)
 163 {
 164         udf_inode_cachep = kmem_cache_create("udf_inode_cache",
 165                                              sizeof(struct udf_inode_info),
 166                                              0, (SLAB_RECLAIM_ACCOUNT |
 167                                                  SLAB_MEM_SPREAD),
 168                                              init_once);
 169         if (!udf_inode_cachep)
 170                 return -ENOMEM;
 171         return 0;
 172 }
 173
 174 static void destroy_inodecache(void)
 175 {
 176         kmem_cache_destroy(udf_inode_cachep);
 177 }
 178
 179 /* Superblock operations */
 180 static const struct super_operations udf_sb_ops = {
 181         .alloc_inode    = udf_alloc_inode,
 182         .destroy_inode  = udf_destroy_inode,
 183         .write_inode    = udf_write_inode,
 184         .evict_inode    = udf_evict_inode,
 185         .put_super      = udf_put_super,
 186         .sync_fs        = udf_sync_fs,
 187         .statfs         = udf_statfs,
 188         .remount_fs     = udf_remount_fs,
 189         .show_options   = udf_show_options,
 190 };
 191
 192 struct udf_options {
 193         unsigned char novrs;
 194         unsigned int blocksize;
 195         unsigned int session;
 196         unsigned int lastblock;
 197         unsigned int anchor;
 198         unsigned int volume;
 199         unsigned short partition;
 200         unsigned int fileset;
 201         unsigned int rootdir;
 202         unsigned int flags;
 203         mode_t umask;
 204         gid_t gid;
 205         uid_t uid;
 206         mode_t fmode;
 207         mode_t dmode;
 208         struct nls_table *nls_map;
 209 };
 210
 211 static int __init init_udf_fs(void)
 212 {
 213         int err;
 214
 215         err = init_inodecache();
 216         if (err)
 217                 goto out1;
 218         err = register_filesystem(&udf_fstype);
 219         if (err)
 220                 goto out;
 221
 222         return 0;
 223
 224 out:
 225         destroy_inodecache();
 226
 227 out1:
 228         return err;
 229 }
 230
 231 static void __exit exit_udf_fs(void)
 232 {
 233         unregister_filesystem(&udf_fstype);
 234         destroy_inodecache();
 235 }
 236
 237 module_init(init_udf_fs)
 238 module_exit(exit_udf_fs)
 239
 240 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
 241 {
 242         struct udf_sb_info *sbi = UDF_SB(sb);
 243
 244         sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map),
 245                                   GFP_KERNEL);
 246         if (!sbi->s_partmaps) {
 247                 udf_error(sb, __func__,
 248                           "Unable to allocate space for %d partition maps",
 249                           count);
 250                 sbi->s_partitions = 0;
 251                 return -ENOMEM;
 252         }
 253
 254         sbi->s_partitions = count;
 255         return 0;
 256 }
 257
 258 static int udf_show_options(struct seq_file *seq, struct vfsmount *mnt)
 259 {
 260         struct super_block *sb = mnt->mnt_sb;
 261         struct udf_sb_info *sbi = UDF_SB(sb);
 262
 263         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
 264                 seq_puts(seq, ",nostrict");
 265         if (UDF_QUERY_FLAG(sb, UDF_FLAG_BLOCKSIZE_SET))
 266                 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
 267         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
 268                 seq_puts(seq, ",unhide");
 269         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
 270                 seq_puts(seq, ",undelete");
 271         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
 272                 seq_puts(seq, ",noadinicb");
 273         if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
 274                 seq_puts(seq, ",shortad");
 275         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
 276                 seq_puts(seq, ",uid=forget");
 277         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_IGNORE))
 278                 seq_puts(seq, ",uid=ignore");
 279         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
 280                 seq_puts(seq, ",gid=forget");
 281         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE))
 282                 seq_puts(seq, ",gid=ignore");
 283         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
 284                 seq_printf(seq, ",uid=%u", sbi->s_uid);
 285         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
 286                 seq_printf(seq, ",gid=%u", sbi->s_gid);
 287         if (sbi->s_umask != 0)
 288                 seq_printf(seq, ",umask=%o", sbi->s_umask);
 289         if (sbi->s_fmode != UDF_INVALID_MODE)
 290                 seq_printf(seq, ",mode=%o", sbi->s_fmode);
 291         if (sbi->s_dmode != UDF_INVALID_MODE)
 292                 seq_printf(seq, ",dmode=%o", sbi->s_dmode);
 293         if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
 294                 seq_printf(seq, ",session=%u", sbi->s_session);
 295         if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
 296                 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
 297         if (sbi->s_anchor != 0)
 298                 seq_printf(seq, ",anchor=%u", sbi->s_anchor);
 299         /*
 300          * volume, partition, fileset and rootdir seem to be ignored
 301          * currently
 302          */
 303         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
 304                 seq_puts(seq, ",utf8");
 305         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
 306                 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
 307
 308         return 0;
 309 }
 310
 311 /*
 312  * udf_parse_options
 313  *
 314  * PURPOSE
 315  *      Parse mount options.
 316  *
 317  * DESCRIPTION
 318  *      The following mount options are supported:
 319  *
 320  *      gid=            Set the default group.
 321  *      umask=          Set the default umask.
 322  *      mode=           Set the default file permissions.
 323  *      dmode=          Set the default directory permissions.
 324  *      uid=            Set the default user.
 325  *      bs=             Set the block size.
 326  *      unhide          Show otherwise hidden files.
 327  *      undelete        Show deleted files in lists.
 328  *      adinicb         Embed data in the inode (default)
 329  *      noadinicb       Don't embed data in the inode
 330  *      shortad         Use short ad's
 331  *      longad          Use long ad's (default)
 332  *      nostrict        Unset strict conformance
 333  *      iocharset=      Set the NLS character set
 334  *
 335  *      The remaining are for debugging and disaster recovery:
 336  *
 337  *      novrs           Skip volume sequence recognition
 338  *
 339  *      The following expect a offset from 0.
 340  *
 341  *      session=        Set the CDROM session (default= last session)
 342  *      anchor=         Override standard anchor location. (default= 256)
 343  *      volume=         Override the VolumeDesc location. (unused)
 344  *      partition=      Override the PartitionDesc location. (unused)
 345  *      lastblock=      Set the last block of the filesystem/
 346  *
 347  *      The following expect a offset from the partition root.
 348  *
 349  *      fileset=        Override the fileset block location. (unused)
 350  *      rootdir=        Override the root directory location. (unused)
 351  *              WARNING: overriding the rootdir to a non-directory may
 352  *              yield highly unpredictable results.
 353  *
 354  * PRE-CONDITIONS
 355  *      options         Pointer to mount options string.
 356  *      uopts           Pointer to mount options variable.
 357  *
 358  * POST-CONDITIONS
 359  *      <return>        1       Mount options parsed okay.
 360  *      <return>        0       Error parsing mount options.
 361  *
 362  * HISTORY
 363  *      July 1, 1997 - Andrew E. Mileski
 364  *      Written, tested, and released.
 365  */
 366
 367 enum {
 368         Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
 369         Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
 370         Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
 371         Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
 372         Opt_rootdir, Opt_utf8, Opt_iocharset,
 373         Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore,
 374         Opt_fmode, Opt_dmode
 375 };
 376
 377 static const match_table_t tokens = {
 378         {Opt_novrs,     "novrs"},
 379         {Opt_nostrict,  "nostrict"},
 380         {Opt_bs,        "bs=%u"},
 381         {Opt_unhide,    "unhide"},
 382         {Opt_undelete,  "undelete"},
 383         {Opt_noadinicb, "noadinicb"},
 384         {Opt_adinicb,   "adinicb"},
 385         {Opt_shortad,   "shortad"},
 386         {Opt_longad,    "longad"},
 387         {Opt_uforget,   "uid=forget"},
 388         {Opt_uignore,   "uid=ignore"},
 389         {Opt_gforget,   "gid=forget"},
 390         {Opt_gignore,   "gid=ignore"},
 391         {Opt_gid,       "gid=%u"},
 392         {Opt_uid,       "uid=%u"},
 393         {Opt_umask,     "umask=%o"},
 394         {Opt_session,   "session=%u"},
 395         {Opt_lastblock, "lastblock=%u"},
 396         {Opt_anchor,    "anchor=%u"},
 397         {Opt_volume,    "volume=%u"},
 398         {Opt_partition, "partition=%u"},
 399         {Opt_fileset,   "fileset=%u"},
 400         {Opt_rootdir,   "rootdir=%u"},
 401         {Opt_utf8,      "utf8"},
 402         {Opt_iocharset, "iocharset=%s"},
 403         {Opt_fmode,     "mode=%o"},
 404         {Opt_dmode,     "dmode=%o"},
 405         {Opt_err,       NULL}
 406 };
 407
 408 static int udf_parse_options(char *options, struct udf_options *uopt,
 409                              bool remount)
 410 {
 411         char *p;
 412         int option;
 413
 414         uopt->novrs = 0;
 415         uopt->partition = 0xFFFF;
 416         uopt->session = 0xFFFFFFFF;
 417         uopt->lastblock = 0;
 418         uopt->anchor = 0;
 419         uopt->volume = 0xFFFFFFFF;
 420         uopt->rootdir = 0xFFFFFFFF;
 421         uopt->fileset = 0xFFFFFFFF;
 422         uopt->nls_map = NULL;
 423
 424         if (!options)
 425                 return 1;
 426
 427         while ((p = strsep(&options, ",")) != NULL) {
 428                 substring_t args[MAX_OPT_ARGS];
 429                 int token;
 430                 if (!*p)
 431                         continue;
 432
 433                 token = match_token(p, tokens, args);
 434                 switch (token) {
 435                 case Opt_novrs:
 436                         uopt->novrs = 1;
 437                         break;
 438                 case Opt_bs:
 439                         if (match_int(&args[0], &option))
 440                                 return 0;
 441                         uopt->blocksize = option;
 442                         uopt->flags |= (1 << UDF_FLAG_BLOCKSIZE_SET);
 443                         break;
 444                 case Opt_unhide:
 445                         uopt->flags |= (1 << UDF_FLAG_UNHIDE);
 446                         break;
 447                 case Opt_undelete:
 448                         uopt->flags |= (1 << UDF_FLAG_UNDELETE);
 449                         break;
 450                 case Opt_noadinicb:
 451                         uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
 452                         break;
 453                 case Opt_adinicb:
 454                         uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
 455                         break;
 456                 case Opt_shortad:
 457                         uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
 458                         break;
 459                 case Opt_longad:
 460                         uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
 461                         break;
 462                 case Opt_gid:
 463                         if (match_int(args, &option))
 464                                 return 0;
 465                         uopt->gid = option;
 466                         uopt->flags |= (1 << UDF_FLAG_GID_SET);
 467                         break;
 468                 case Opt_uid:
 469                         if (match_int(args, &option))
 470                                 return 0;
 471                         uopt->uid = option;
 472                         uopt->flags |= (1 << UDF_FLAG_UID_SET);
 473                         break;
 474                 case Opt_umask:
 475                         if (match_octal(args, &option))
 476                                 return 0;
 477                         uopt->umask = option;
 478                         break;
 479                 case Opt_nostrict:
 480                         uopt->flags &= ~(1 << UDF_FLAG_STRICT);
 481                         break;
 482                 case Opt_session:
 483                         if (match_int(args, &option))
 484                                 return 0;
 485                         uopt->session = option;
 486                         if (!remount)
 487                                 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
 488                         break;
 489                 case Opt_lastblock:
 490                         if (match_int(args, &option))
 491                                 return 0;
 492                         uopt->lastblock = option;
 493                         if (!remount)
 494                                 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
 495                         break;
 496                 case Opt_anchor:
 497                         if (match_int(args, &option))
 498                                 return 0;
 499                         uopt->anchor = option;
 500                         break;
 501                 case Opt_volume:
 502                         if (match_int(args, &option))
 503                                 return 0;
 504                         uopt->volume = option;
 505                         break;
 506                 case Opt_partition:
 507                         if (match_int(args, &option))
 508                                 return 0;
 509                         uopt->partition = option;
 510                         break;
 511                 case Opt_fileset:
 512                         if (match_int(args, &option))
 513                                 return 0;
 514                         uopt->fileset = option;
 515                         break;
 516                 case Opt_rootdir:
 517                         if (match_int(args, &option))
 518                                 return 0;
 519                         uopt->rootdir = option;
 520                         break;
 521                 case Opt_utf8:
 522                         uopt->flags |= (1 << UDF_FLAG_UTF8);
 523                         break;
 524 #ifdef CONFIG_UDF_NLS
 525                 case Opt_iocharset:
 526                         uopt->nls_map = load_nls(args[0].from);
 527                         uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
 528                         break;
 529 #endif
 530                 case Opt_uignore:
 531                         uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
 532                         break;
 533                 case Opt_uforget:
 534                         uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
 535                         break;
 536                 case Opt_gignore:
 537                         uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
 538                         break;
 539                 case Opt_gforget:
 540                         uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
 541                         break;
 542                 case Opt_fmode:
 543                         if (match_octal(args, &option))
 544                                 return 0;
 545                         uopt->fmode = option & 0777;
 546                         break;
 547                 case Opt_dmode:
 548                         if (match_octal(args, &option))
 549                                 return 0;
 550                         uopt->dmode = option & 0777;
 551                         break;
 552                 default:
 553                         printk(KERN_ERR "udf: bad mount option \"%s\" "
 554                                "or missing value\n", p);
 555                         return 0;
 556                 }
 557         }
 558         return 1;
 559 }
 560
 561 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
 562 {
 563         struct udf_options uopt;
 564         struct udf_sb_info *sbi = UDF_SB(sb);
 565         int error = 0;
 566
 567         uopt.flags = sbi->s_flags;
 568         uopt.uid   = sbi->s_uid;
 569         uopt.gid   = sbi->s_gid;
 570         uopt.umask = sbi->s_umask;
 571         uopt.fmode = sbi->s_fmode;
 572         uopt.dmode = sbi->s_dmode;
 573
 574         if (!udf_parse_options(options, &uopt, true))
 575                 return -EINVAL;
 576
 577         lock_kernel();
 578         sbi->s_flags = uopt.flags;
 579         sbi->s_uid   = uopt.uid;
 580         sbi->s_gid   = uopt.gid;
 581         sbi->s_umask = uopt.umask;
 582         sbi->s_fmode = uopt.fmode;
 583         sbi->s_dmode = uopt.dmode;
 584
 585         if (sbi->s_lvid_bh) {
 586                 int write_rev = le16_to_cpu(udf_sb_lvidiu(sbi)->minUDFWriteRev);
 587                 if (write_rev > UDF_MAX_WRITE_VERSION)
 588                         *flags |= MS_RDONLY;
 589         }
 590
 591         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 592                 goto out_unlock;
 593
 594         if (*flags & MS_RDONLY)
 595                 udf_close_lvid(sb);
 596         else
 597                 udf_open_lvid(sb);
 598
 599 out_unlock:
 600         unlock_kernel();
 601         return error;
 602 }
 603
 604 /* Check Volume Structure Descriptors (ECMA 167 2/9.1) */
 605 /* We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
 606 static loff_t udf_check_vsd(struct super_block *sb)
 607 {
 608         struct volStructDesc *vsd = NULL;
 609         loff_t sector = 32768;
 610         int sectorsize;
 611         struct buffer_head *bh = NULL;
 612         int nsr02 = 0;
 613         int nsr03 = 0;
 614         struct udf_sb_info *sbi;
 615
 616         sbi = UDF_SB(sb);
 617         if (sb->s_blocksize < sizeof(struct volStructDesc))
 618                 sectorsize = sizeof(struct volStructDesc);
 619         else
 620                 sectorsize = sb->s_blocksize;
 621
 622         sector += (sbi->s_session << sb->s_blocksize_bits);
 623
 624         udf_debug("Starting at sector %u (%ld byte sectors)\n",
 625                   (unsigned int)(sector >> sb->s_blocksize_bits),
 626                   sb->s_blocksize);
 627         /* Process the sequence (if applicable) */
 628         for (; !nsr02 && !nsr03; sector += sectorsize) {
 629                 /* Read a block */
 630                 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
 631                 if (!bh)
 632                         break;
 633
 634                 /* Look for ISO  descriptors */
 635                 vsd = (struct volStructDesc *)(bh->b_data +
 636                                               (sector & (sb->s_blocksize - 1)));
 637
 638                 if (vsd->stdIdent[0] == 0) {
 639                         brelse(bh);
 640                         break;
 641                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
 642                                     VSD_STD_ID_LEN)) {
 643                         switch (vsd->structType) {
 644                         case 0:
 645                                 udf_debug("ISO9660 Boot Record found\n");
 646                                 break;
 647                         case 1:
 648                                 udf_debug("ISO9660 Primary Volume Descriptor "
 649                                           "found\n");
 650                                 break;
 651                         case 2:
 652                                 udf_debug("ISO9660 Supplementary Volume "
 653                                           "Descriptor found\n");
 654                                 break;
 655                         case 3:
 656                                 udf_debug("ISO9660 Volume Partition Descriptor "
 657                                           "found\n");
 658                                 break;
 659                         case 255:
 660                                 udf_debug("ISO9660 Volume Descriptor Set "
 661                                           "Terminator found\n");
 662                                 break;
 663                         default:
 664                                 udf_debug("ISO9660 VRS (%u) found\n",
 665                                           vsd->structType);
 666                                 break;
 667                         }
 668                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
 669                                     VSD_STD_ID_LEN))
 670                         ; /* nothing */
 671                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
 672                                     VSD_STD_ID_LEN)) {
 673                         brelse(bh);
 674                         break;
 675                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
 676                                     VSD_STD_ID_LEN))
 677                         nsr02 = sector;
 678                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
 679                                     VSD_STD_ID_LEN))
 680                         nsr03 = sector;
 681                 brelse(bh);
 682         }
 683
 684         if (nsr03)
 685                 return nsr03;
 686         else if (nsr02)
 687                 return nsr02;
 688         else if (sector - (sbi->s_session << sb->s_blocksize_bits) == 32768)
 689                 return -1;
 690         else
 691                 return 0;
 692 }
 693
 694 static int udf_find_fileset(struct super_block *sb,
 695                             struct kernel_lb_addr *fileset,
 696                             struct kernel_lb_addr *root)
 697 {
 698         struct buffer_head *bh = NULL;
 699         long lastblock;
 700         uint16_t ident;
 701         struct udf_sb_info *sbi;
 702
 703         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
 704             fileset->partitionReferenceNum != 0xFFFF) {
 705                 bh = udf_read_ptagged(sb, fileset, 0, &ident);
 706
 707                 if (!bh) {
 708                         return 1;
 709                 } else if (ident != TAG_IDENT_FSD) {
 710                         brelse(bh);
 711                         return 1;
 712                 }
 713
 714         }
 715
 716         sbi = UDF_SB(sb);
 717         if (!bh) {
 718                 /* Search backwards through the partitions */
 719                 struct kernel_lb_addr newfileset;
 720
 721 /* --> cvg: FIXME - is it reasonable? */
 722                 return 1;
 723
 724                 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
 725                      (newfileset.partitionReferenceNum != 0xFFFF &&
 726                       fileset->logicalBlockNum == 0xFFFFFFFF &&
 727                       fileset->partitionReferenceNum == 0xFFFF);
 728                      newfileset.partitionReferenceNum--) {
 729                         lastblock = sbi->s_partmaps
 730                                         [newfileset.partitionReferenceNum]
 731                                                 .s_partition_len;
 732                         newfileset.logicalBlockNum = 0;
 733
 734                         do {
 735                                 bh = udf_read_ptagged(sb, &newfileset, 0,
 736                                                       &ident);
 737                                 if (!bh) {
 738                                         newfileset.logicalBlockNum++;
 739                                         continue;
 740                                 }
 741
 742                                 switch (ident) {
 743                                 case TAG_IDENT_SBD:
 744                                 {
 745                                         struct spaceBitmapDesc *sp;
 746                                         sp = (struct spaceBitmapDesc *)
 747                                                                 bh->b_data;
 748                                         newfileset.logicalBlockNum += 1 +
 749                                                 ((le32_to_cpu(sp->numOfBytes) +
 750                                                   sizeof(struct spaceBitmapDesc)
 751                                                   - 1) >> sb->s_blocksize_bits);
 752                                         brelse(bh);
 753                                         break;
 754                                 }
 755                                 case TAG_IDENT_FSD:
 756                                         *fileset = newfileset;
 757                                         break;
 758                                 default:
 759                                         newfileset.logicalBlockNum++;
 760                                         brelse(bh);
 761                                         bh = NULL;
 762                                         break;
 763                                 }
 764                         } while (newfileset.logicalBlockNum < lastblock &&
 765                                  fileset->logicalBlockNum == 0xFFFFFFFF &&
 766                                  fileset->partitionReferenceNum == 0xFFFF);
 767                 }
 768         }
 769
 770         if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
 771              fileset->partitionReferenceNum != 0xFFFF) && bh) {
 772                 udf_debug("Fileset at block=%d, partition=%d\n",
 773                           fileset->logicalBlockNum,
 774                           fileset->partitionReferenceNum);
 775
 776                 sbi->s_partition = fileset->partitionReferenceNum;
 777                 udf_load_fileset(sb, bh, root);
 778                 brelse(bh);
 779                 return 0;
 780         }
 781         return 1;
 782 }
 783
 784 static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
 785 {
 786         struct primaryVolDesc *pvoldesc;
 787         struct ustr *instr, *outstr;
 788         struct buffer_head *bh;
 789         uint16_t ident;
 790         int ret = 1;
 791
 792         instr = kmalloc(sizeof(struct ustr), GFP_NOFS);
 793         if (!instr)
 794                 return 1;
 795
 796         outstr = kmalloc(sizeof(struct ustr), GFP_NOFS);
 797         if (!outstr)
 798                 goto out1;
 799
 800         bh = udf_read_tagged(sb, block, block, &ident);
 801         if (!bh)
 802                 goto out2;
 803
 804         BUG_ON(ident != TAG_IDENT_PVD);
 805
 806         pvoldesc = (struct primaryVolDesc *)bh->b_data;
 807
 808         if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
 809                               pvoldesc->recordingDateAndTime)) {
 810 #ifdef UDFFS_DEBUG
 811                 struct timestamp *ts = &pvoldesc->recordingDateAndTime;
 812                 udf_debug("recording time %04u/%02u/%02u"
 813                           " %02u:%02u (%x)\n",
 814                           le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
 815                           ts->minute, le16_to_cpu(ts->typeAndTimezone));
 816 #endif
 817         }
 818
 819         if (!udf_build_ustr(instr, pvoldesc->volIdent, 32))
 820                 if (udf_CS0toUTF8(outstr, instr)) {
 821                         strncpy(UDF_SB(sb)->s_volume_ident, outstr->u_name,
 822                                 outstr->u_len > 31 ? 31 : outstr->u_len);
 823                         udf_debug("volIdent[] = '%s'\n",
 824                                         UDF_SB(sb)->s_volume_ident);
 825                 }
 826
 827         if (!udf_build_ustr(instr, pvoldesc->volSetIdent, 128))
 828                 if (udf_CS0toUTF8(outstr, instr))
 829                         udf_debug("volSetIdent[] = '%s'\n", outstr->u_name);
 830
 831         brelse(bh);
 832         ret = 0;
 833 out2:
 834         kfree(outstr);
 835 out1:
 836         kfree(instr);
 837         return ret;
 838 }
 839
 840 static int udf_load_metadata_files(struct super_block *sb, int partition)
 841 {
 842         struct udf_sb_info *sbi = UDF_SB(sb);
 843         struct udf_part_map *map;
 844         struct udf_meta_data *mdata;
 845         struct kernel_lb_addr addr;
 846         int fe_error = 0;
 847
 848         map = &sbi->s_partmaps[partition];
 849         mdata = &map->s_type_specific.s_metadata;
 850
 851         /* metadata address */
 852         addr.logicalBlockNum =  mdata->s_meta_file_loc;
 853         addr.partitionReferenceNum = map->s_partition_num;
 854
 855         udf_debug("Metadata file location: block = %d part = %d\n",
 856                           addr.logicalBlockNum, addr.partitionReferenceNum);
 857
 858         mdata->s_metadata_fe = udf_iget(sb, &addr);
 859
 860         if (mdata->s_metadata_fe == NULL) {
 861                 udf_warning(sb, __func__, "metadata inode efe not found, "
 862                                 "will try mirror inode.");
 863                 fe_error = 1;
 864         } else if (UDF_I(mdata->s_metadata_fe)->i_alloc_type !=
 865                  ICBTAG_FLAG_AD_SHORT) {
 866                 udf_warning(sb, __func__, "metadata inode efe does not have "
 867                         "short allocation descriptors!");
 868                 fe_error = 1;
 869                 iput(mdata->s_metadata_fe);
 870                 mdata->s_metadata_fe = NULL;
 871         }
 872
 873         /* mirror file entry */
 874         addr.logicalBlockNum = mdata->s_mirror_file_loc;
 875         addr.partitionReferenceNum = map->s_partition_num;
 876
 877         udf_debug("Mirror metadata file location: block = %d part = %d\n",
 878                           addr.logicalBlockNum, addr.partitionReferenceNum);
 879
 880         mdata->s_mirror_fe = udf_iget(sb, &addr);
 881
 882         if (mdata->s_mirror_fe == NULL) {
 883                 if (fe_error) {
 884                         udf_error(sb, __func__, "mirror inode efe not found "
 885                         "and metadata inode is missing too, exiting...");
 886                         goto error_exit;
 887                 } else
 888                         udf_warning(sb, __func__, "mirror inode efe not found,"
 889                                         " but metadata inode is OK");
 890         } else if (UDF_I(mdata->s_mirror_fe)->i_alloc_type !=
 891                  ICBTAG_FLAG_AD_SHORT) {
 892                 udf_warning(sb, __func__, "mirror inode efe does not have "
 893                         "short allocation descriptors!");
 894                 iput(mdata->s_mirror_fe);
 895                 mdata->s_mirror_fe = NULL;
 896                 if (fe_error)
 897                         goto error_exit;
 898         }
 899
 900         /*
 901          * bitmap file entry
 902          * Note:
 903          * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
 904         */
 905         if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
 906                 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
 907                 addr.partitionReferenceNum = map->s_partition_num;
 908
 909                 udf_debug("Bitmap file location: block = %d part = %d\n",
 910                         addr.logicalBlockNum, addr.partitionReferenceNum);
 911
 912                 mdata->s_bitmap_fe = udf_iget(sb, &addr);
 913
 914                 if (mdata->s_bitmap_fe == NULL) {
 915                         if (sb->s_flags & MS_RDONLY)
 916                                 udf_warning(sb, __func__, "bitmap inode efe "
 917                                         "not found but it's ok since the disc"
 918                                         " is mounted read-only");
 919                         else {
 920                                 udf_error(sb, __func__, "bitmap inode efe not "
 921                                         "found and attempted read-write mount");
 922                                 goto error_exit;
 923                         }
 924                 }
 925         }
 926
 927         udf_debug("udf_load_metadata_files Ok\n");
 928
 929         return 0;
 930
 931 error_exit:
 932         return 1;
 933 }
 934
 935 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
 936                              struct kernel_lb_addr *root)
 937 {
 938         struct fileSetDesc *fset;
 939
 940         fset = (struct fileSetDesc *)bh->b_data;
 941
 942         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
 943
 944         UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
 945
 946         udf_debug("Rootdir at block=%d, partition=%d\n",
 947                   root->logicalBlockNum, root->partitionReferenceNum);
 948 }
 949
 950 int udf_compute_nr_groups(struct super_block *sb, u32 partition)
 951 {
 952         struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
 953         return DIV_ROUND_UP(map->s_partition_len +
 954                             (sizeof(struct spaceBitmapDesc) << 3),
 955                             sb->s_blocksize * 8);
 956 }
 957
 958 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
 959 {
 960         struct udf_bitmap *bitmap;
 961         int nr_groups;
 962         int size;
 963
 964         nr_groups = udf_compute_nr_groups(sb, index);
 965         size = sizeof(struct udf_bitmap) +
 966                 (sizeof(struct buffer_head *) * nr_groups);
 967
 968         if (size <= PAGE_SIZE)
 969                 bitmap = kmalloc(size, GFP_KERNEL);
 970         else
 971                 bitmap = vmalloc(size); /* TODO: get rid of vmalloc */
 972
 973         if (bitmap == NULL) {
 974                 udf_error(sb, __func__,
 975                           "Unable to allocate space for bitmap "
 976                           "and %d buffer_head pointers", nr_groups);
 977                 return NULL;
 978         }
 979
 980         memset(bitmap, 0x00, size);
 981         bitmap->s_block_bitmap = (struct buffer_head **)(bitmap + 1);
 982         bitmap->s_nr_groups = nr_groups;
 983         return bitmap;
 984 }
 985
 986 static int udf_fill_partdesc_info(struct super_block *sb,
 987                 struct partitionDesc *p, int p_index)
 988 {
 989         struct udf_part_map *map;
 990         struct udf_sb_info *sbi = UDF_SB(sb);
 991         struct partitionHeaderDesc *phd;
 992
 993         map = &sbi->s_partmaps[p_index];
 994
 995         map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
 996         map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
 997
 998         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
 999                 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
1000         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
1001                 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
1002         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
1003                 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
1004         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
1005                 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
1006
1007         udf_debug("Partition (%d type %x) starts at physical %d, "
1008                   "block length %d\n", p_index,
1009                   map->s_partition_type, map->s_partition_root,
1010                   map->s_partition_len);
1011
1012         if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1013             strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
1014                 return 0;
1015
1016         phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1017         if (phd->unallocSpaceTable.extLength) {
1018                 struct kernel_lb_addr loc = {
1019                         .logicalBlockNum = le32_to_cpu(
1020                                 phd->unallocSpaceTable.extPosition),
1021                         .partitionReferenceNum = p_index,
1022                 };
1023
1024                 map->s_uspace.s_table = udf_iget(sb, &loc);
1025                 if (!map->s_uspace.s_table) {
1026                         udf_debug("cannot load unallocSpaceTable (part %d)\n",
1027                                         p_index);
1028                         return 1;
1029                 }
1030                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1031                 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
1032                                 p_index, map->s_uspace.s_table->i_ino);
1033         }
1034
1035         if (phd->unallocSpaceBitmap.extLength) {
1036                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1037                 if (!bitmap)
1038                         return 1;
1039                 map->s_uspace.s_bitmap = bitmap;
1040                 bitmap->s_extLength = le32_to_cpu(
1041                                 phd->unallocSpaceBitmap.extLength);
1042                 bitmap->s_extPosition = le32_to_cpu(
1043                                 phd->unallocSpaceBitmap.extPosition);
1044                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1045                 udf_debug("unallocSpaceBitmap (part %d) @ %d\n", p_index,
1046                                                 bitmap->s_extPosition);
1047         }
1048
1049         if (phd->partitionIntegrityTable.extLength)
1050                 udf_debug("partitionIntegrityTable (part %d)\n", p_index);
1051
1052         if (phd->freedSpaceTable.extLength) {
1053                 struct kernel_lb_addr loc = {
1054                         .logicalBlockNum = le32_to_cpu(
1055                                 phd->freedSpaceTable.extPosition),
1056                         .partitionReferenceNum = p_index,
1057                 };
1058
1059                 map->s_fspace.s_table = udf_iget(sb, &loc);
1060                 if (!map->s_fspace.s_table) {
1061                         udf_debug("cannot load freedSpaceTable (part %d)\n",
1062                                 p_index);
1063                         return 1;
1064                 }
1065
1066                 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
1067                 udf_debug("freedSpaceTable (part %d) @ %ld\n",
1068                                 p_index, map->s_fspace.s_table->i_ino);
1069         }
1070
1071         if (phd->freedSpaceBitmap.extLength) {
1072                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1073                 if (!bitmap)
1074                         return 1;
1075                 map->s_fspace.s_bitmap = bitmap;
1076                 bitmap->s_extLength = le32_to_cpu(
1077                                 phd->freedSpaceBitmap.extLength);
1078                 bitmap->s_extPosition = le32_to_cpu(
1079                                 phd->freedSpaceBitmap.extPosition);
1080                 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1081                 udf_debug("freedSpaceBitmap (part %d) @ %d\n", p_index,
1082                                         bitmap->s_extPosition);
1083         }
1084         return 0;
1085 }
1086
1087 static void udf_find_vat_block(struct super_block *sb, int p_index,
1088                                int type1_index, sector_t start_block)
1089 {
1090         struct udf_sb_info *sbi = UDF_SB(sb);
1091         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1092         sector_t vat_block;
1093         struct kernel_lb_addr ino;
1094
1095         /*
1096          * VAT file entry is in the last recorded block. Some broken disks have
1097          * it a few blocks before so try a bit harder...
1098          */
1099         ino.partitionReferenceNum = type1_index;
1100         for (vat_block = start_block;
1101              vat_block >= map->s_partition_root &&
1102              vat_block >= start_block - 3 &&
1103              !sbi->s_vat_inode; vat_block--) {
1104                 ino.logicalBlockNum = vat_block - map->s_partition_root;
1105                 sbi->s_vat_inode = udf_iget(sb, &ino);
1106         }
1107 }
1108
1109 static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1110 {
1111         struct udf_sb_info *sbi = UDF_SB(sb);
1112         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1113         struct buffer_head *bh = NULL;
1114         struct udf_inode_info *vati;
1115         uint32_t pos;
1116         struct virtualAllocationTable20 *vat20;
1117         sector_t blocks = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
1118
1119         udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block);
1120         if (!sbi->s_vat_inode &&
1121             sbi->s_last_block != blocks - 1) {
1122                 printk(KERN_NOTICE "UDF-fs: Failed to read VAT inode from the"
1123                        " last recorded block (%lu), retrying with the last "
1124                        "block of the device (%lu).\n",
1125                        (unsigned long)sbi->s_last_block,
1126                        (unsigned long)blocks - 1);
1127                 udf_find_vat_block(sb, p_index, type1_index, blocks - 1);
1128         }
1129         if (!sbi->s_vat_inode)
1130                 return 1;
1131
1132         if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1133                 map->s_type_specific.s_virtual.s_start_offset = 0;
1134                 map->s_type_specific.s_virtual.s_num_entries =
1135                         (sbi->s_vat_inode->i_size - 36) >> 2;
1136         } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1137                 vati = UDF_I(sbi->s_vat_inode);
1138                 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1139                         pos = udf_block_map(sbi->s_vat_inode, 0);
1140                         bh = sb_bread(sb, pos);
1141                         if (!bh)
1142                                 return 1;
1143                         vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1144                 } else {
1145                         vat20 = (struct virtualAllocationTable20 *)
1146                                                         vati->i_ext.i_data;
1147                 }
1148
1149                 map->s_type_specific.s_virtual.s_start_offset =
1150                         le16_to_cpu(vat20->lengthHeader);
1151                 map->s_type_specific.s_virtual.s_num_entries =
1152                         (sbi->s_vat_inode->i_size -
1153                                 map->s_type_specific.s_virtual.
1154                                         s_start_offset) >> 2;
1155                 brelse(bh);
1156         }
1157         return 0;
1158 }
1159
1160 static int udf_load_partdesc(struct super_block *sb, sector_t block)
1161 {
1162         struct buffer_head *bh;
1163         struct partitionDesc *p;
1164         struct udf_part_map *map;
1165         struct udf_sb_info *sbi = UDF_SB(sb);
1166         int i, type1_idx;
1167         uint16_t partitionNumber;
1168         uint16_t ident;
1169         int ret = 0;
1170
1171         bh = udf_read_tagged(sb, block, block, &ident);
1172         if (!bh)
1173                 return 1;
1174         if (ident != TAG_IDENT_PD)
1175                 goto out_bh;
1176
1177         p = (struct partitionDesc *)bh->b_data;
1178         partitionNumber = le16_to_cpu(p->partitionNumber);
1179
1180         /* First scan for TYPE1, SPARABLE and METADATA partitions */
1181         for (i = 0; i < sbi->s_partitions; i++) {
1182                 map = &sbi->s_partmaps[i];
1183                 udf_debug("Searching map: (%d == %d)\n",
1184                           map->s_partition_num, partitionNumber);
1185                 if (map->s_partition_num == partitionNumber &&
1186                     (map->s_partition_type == UDF_TYPE1_MAP15 ||
1187                      map->s_partition_type == UDF_SPARABLE_MAP15))
1188                         break;
1189         }
1190
1191         if (i >= sbi->s_partitions) {
1192                 udf_debug("Partition (%d) not found in partition map\n",
1193                           partitionNumber);
1194                 goto out_bh;
1195         }
1196
1197         ret = udf_fill_partdesc_info(sb, p, i);
1198
1199         /*
1200          * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1201          * PHYSICAL partitions are already set up
1202          */
1203         type1_idx = i;
1204         for (i = 0; i < sbi->s_partitions; i++) {
1205                 map = &sbi->s_partmaps[i];
1206
1207                 if (map->s_partition_num == partitionNumber &&
1208                     (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1209                      map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1210                      map->s_partition_type == UDF_METADATA_MAP25))
1211                         break;
1212         }
1213
1214         if (i >= sbi->s_partitions)
1215                 goto out_bh;
1216
1217         ret = udf_fill_partdesc_info(sb, p, i);
1218         if (ret)
1219                 goto out_bh;
1220
1221         if (map->s_partition_type == UDF_METADATA_MAP25) {
1222                 ret = udf_load_metadata_files(sb, i);
1223                 if (ret) {
1224                         printk(KERN_ERR "UDF-fs: error loading MetaData "
1225                         "partition map %d\n", i);
1226                         goto out_bh;
1227                 }
1228         } else {
1229                 ret = udf_load_vat(sb, i, type1_idx);
1230                 if (ret)
1231                         goto out_bh;
1232                 /*
1233                  * Mark filesystem read-only if we have a partition with
1234                  * virtual map since we don't handle writing to it (we
1235                  * overwrite blocks instead of relocating them).
1236                  */
1237                 sb->s_flags |= MS_RDONLY;
1238                 printk(KERN_NOTICE "UDF-fs: Filesystem marked read-only "
1239                         "because writing to pseudooverwrite partition is "
1240                         "not implemented.\n");
1241         }
1242 out_bh:
1243         /* In case loading failed, we handle cleanup in udf_fill_super */
1244         brelse(bh);
1245         return ret;
1246 }
1247
1248 static int udf_load_logicalvol(struct super_block *sb, sector_t block,
1249                                struct kernel_lb_addr *fileset)
1250 {
1251         struct logicalVolDesc *lvd;
1252         int i, j, offset;
1253         uint8_t type;
1254         struct udf_sb_info *sbi = UDF_SB(sb);
1255         struct genericPartitionMap *gpm;
1256         uint16_t ident;
1257         struct buffer_head *bh;
1258         int ret = 0;
1259
1260         bh = udf_read_tagged(sb, block, block, &ident);
1261         if (!bh)
1262                 return 1;
1263         BUG_ON(ident != TAG_IDENT_LVD);
1264         lvd = (struct logicalVolDesc *)bh->b_data;
1265
1266         i = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1267         if (i != 0) {
1268                 ret = i;
1269                 goto out_bh;
1270         }
1271
1272         for (i = 0, offset = 0;
1273              i < sbi->s_partitions && offset < le32_to_cpu(lvd->mapTableLength);
1274              i++, offset += gpm->partitionMapLength) {
1275                 struct udf_part_map *map = &sbi->s_partmaps[i];
1276                 gpm = (struct genericPartitionMap *)
1277                                 &(lvd->partitionMaps[offset]);
1278                 type = gpm->partitionMapType;
1279                 if (type == 1) {
1280                         struct genericPartitionMap1 *gpm1 =
1281                                 (struct genericPartitionMap1 *)gpm;
1282                         map->s_partition_type = UDF_TYPE1_MAP15;
1283                         map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1284                         map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1285                         map->s_partition_func = NULL;
1286                 } else if (type == 2) {
1287                         struct udfPartitionMap2 *upm2 =
1288                                                 (struct udfPartitionMap2 *)gpm;
1289                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1290                                                 strlen(UDF_ID_VIRTUAL))) {
1291                                 u16 suf =
1292                                         le16_to_cpu(((__le16 *)upm2->partIdent.
1293                                                         identSuffix)[0]);
1294                                 if (suf < 0x0200) {
1295                                         map->s_partition_type =
1296                                                         UDF_VIRTUAL_MAP15;
1297                                         map->s_partition_func =
1298                                                         udf_get_pblock_virt15;
1299                                 } else {
1300                                         map->s_partition_type =
1301                                                         UDF_VIRTUAL_MAP20;
1302                                         map->s_partition_func =
1303                                                         udf_get_pblock_virt20;
1304                                 }
1305                         } else if (!strncmp(upm2->partIdent.ident,
1306                                                 UDF_ID_SPARABLE,
1307                                                 strlen(UDF_ID_SPARABLE))) {
1308                                 uint32_t loc;
1309                                 struct sparingTable *st;
1310                                 struct sparablePartitionMap *spm =
1311                                         (struct sparablePartitionMap *)gpm;
1312
1313                                 map->s_partition_type = UDF_SPARABLE_MAP15;
1314                                 map->s_type_specific.s_sparing.s_packet_len =
1315                                                 le16_to_cpu(spm->packetLength);
1316                                 for (j = 0; j < spm->numSparingTables; j++) {
1317                                         struct buffer_head *bh2;
1318
1319                                         loc = le32_to_cpu(
1320                                                 spm->locSparingTable[j]);
1321                                         bh2 = udf_read_tagged(sb, loc, loc,
1322                                                              &ident);
1323                                         map->s_type_specific.s_sparing.
1324                                                         s_spar_map[j] = bh2;
1325
1326                                         if (bh2 == NULL)
1327                                                 continue;
1328
1329                                         st = (struct sparingTable *)bh2->b_data;
1330                                         if (ident != 0 || strncmp(
1331                                                 st->sparingIdent.ident,
1332                                                 UDF_ID_SPARING,
1333                                                 strlen(UDF_ID_SPARING))) {
1334                                                 brelse(bh2);
1335                                                 map->s_type_specific.s_sparing.
1336                                                         s_spar_map[j] = NULL;
1337                                         }
1338                                 }
1339                                 map->s_partition_func = udf_get_pblock_spar15;
1340                         } else if (!strncmp(upm2->partIdent.ident,
1341                                                 UDF_ID_METADATA,
1342                                                 strlen(UDF_ID_METADATA))) {
1343                                 struct udf_meta_data *mdata =
1344                                         &map->s_type_specific.s_metadata;
1345                                 struct metadataPartitionMap *mdm =
1346                                                 (struct metadataPartitionMap *)
1347                                                 &(lvd->partitionMaps[offset]);
1348                                 udf_debug("Parsing Logical vol part %d "
1349                                         "type %d  id=%s\n", i, type,
1350                                         UDF_ID_METADATA);
1351
1352                                 map->s_partition_type = UDF_METADATA_MAP25;
1353                                 map->s_partition_func = udf_get_pblock_meta25;
1354
1355                                 mdata->s_meta_file_loc   =
1356                                         le32_to_cpu(mdm->metadataFileLoc);
1357                                 mdata->s_mirror_file_loc =
1358                                         le32_to_cpu(mdm->metadataMirrorFileLoc);
1359                                 mdata->s_bitmap_file_loc =
1360                                         le32_to_cpu(mdm->metadataBitmapFileLoc);
1361                                 mdata->s_alloc_unit_size =
1362                                         le32_to_cpu(mdm->allocUnitSize);
1363                                 mdata->s_align_unit_size =
1364                                         le16_to_cpu(mdm->alignUnitSize);
1365                                 mdata->s_dup_md_flag     =
1366                                         mdm->flags & 0x01;
1367
1368                                 udf_debug("Metadata Ident suffix=0x%x\n",
1369                                         (le16_to_cpu(
1370                                          ((__le16 *)
1371                                               mdm->partIdent.identSuffix)[0])));
1372                                 udf_debug("Metadata part num=%d\n",
1373                                         le16_to_cpu(mdm->partitionNum));
1374                                 udf_debug("Metadata part alloc unit size=%d\n",
1375                                         le32_to_cpu(mdm->allocUnitSize));
1376                                 udf_debug("Metadata file loc=%d\n",
1377                                         le32_to_cpu(mdm->metadataFileLoc));
1378                                 udf_debug("Mirror file loc=%d\n",
1379                                        le32_to_cpu(mdm->metadataMirrorFileLoc));
1380                                 udf_debug("Bitmap file loc=%d\n",
1381                                        le32_to_cpu(mdm->metadataBitmapFileLoc));
1382                                 udf_debug("Duplicate Flag: %d %d\n",
1383                                         mdata->s_dup_md_flag, mdm->flags);
1384                         } else {
1385                                 udf_debug("Unknown ident: %s\n",
1386                                           upm2->partIdent.ident);
1387                                 continue;
1388                         }
1389                         map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1390                         map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1391                 }
1392                 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1393                           i, map->s_partition_num, type,
1394                           map->s_volumeseqnum);
1395         }
1396
1397         if (fileset) {
1398                 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
1399
1400                 *fileset = lelb_to_cpu(la->extLocation);
1401                 udf_debug("FileSet found in LogicalVolDesc at block=%d, "
1402                           "partition=%d\n", fileset->logicalBlockNum,
1403                           fileset->partitionReferenceNum);
1404         }
1405         if (lvd->integritySeqExt.extLength)
1406                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1407
1408 out_bh:
1409         brelse(bh);
1410         return ret;
1411 }
1412
1413 /*
1414  * udf_load_logicalvolint
1415  *
1416  */
1417 static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
1418 {
1419         struct buffer_head *bh = NULL;
1420         uint16_t ident;
1421         struct udf_sb_info *sbi = UDF_SB(sb);
1422         struct logicalVolIntegrityDesc *lvid;
1423
1424         while (loc.extLength > 0 &&
1425                (bh = udf_read_tagged(sb, loc.extLocation,
1426                                      loc.extLocation, &ident)) &&
1427                ident == TAG_IDENT_LVID) {
1428                 sbi->s_lvid_bh = bh;
1429                 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1430
1431                 if (lvid->nextIntegrityExt.extLength)
1432                         udf_load_logicalvolint(sb,
1433                                 leea_to_cpu(lvid->nextIntegrityExt));
1434
1435                 if (sbi->s_lvid_bh != bh)
1436                         brelse(bh);
1437                 loc.extLength -= sb->s_blocksize;
1438                 loc.extLocation++;
1439         }
1440         if (sbi->s_lvid_bh != bh)
1441                 brelse(bh);
1442 }
1443
1444 /*
1445  * udf_process_sequence
1446  *
1447  * PURPOSE
1448  *      Process a main/reserve volume descriptor sequence.
1449  *
1450  * PRE-CONDITIONS
1451  *      sb                      Pointer to _locked_ superblock.
1452  *      block                   First block of first extent of the sequence.
1453  *      lastblock               Lastblock of first extent of the sequence.
1454  *
1455  * HISTORY
1456  *      July 1, 1997 - Andrew E. Mileski
1457  *      Written, tested, and released.
1458  */
1459 static noinline int udf_process_sequence(struct super_block *sb, long block,
1460                                 long lastblock, struct kernel_lb_addr *fileset)
1461 {
1462         struct buffer_head *bh = NULL;
1463         struct udf_vds_record vds[VDS_POS_LENGTH];
1464         struct udf_vds_record *curr;
1465         struct generic_desc *gd;
1466         struct volDescPtr *vdp;
1467         int done = 0;
1468         uint32_t vdsn;
1469         uint16_t ident;
1470         long next_s = 0, next_e = 0;
1471
1472         memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1473
1474         /*
1475          * Read the main descriptor sequence and find which descriptors
1476          * are in it.
1477          */
1478         for (; (!done && block <= lastblock); block++) {
1479
1480                 bh = udf_read_tagged(sb, block, block, &ident);
1481                 if (!bh) {
1482                         printk(KERN_ERR "udf: Block %Lu of volume descriptor "
1483                                "sequence is corrupted or we could not read "
1484                                "it.\n", (unsigned long long)block);
1485                         return 1;
1486                 }
1487
1488                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1489                 gd = (struct generic_desc *)bh->b_data;
1490                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1491                 switch (ident) {
1492                 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1493                         curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1494                         if (vdsn >= curr->volDescSeqNum) {
1495                                 curr->volDescSeqNum = vdsn;
1496                                 curr->block = block;
1497                         }
1498                         break;
1499                 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1500                         curr = &vds[VDS_POS_VOL_DESC_PTR];
1501                         if (vdsn >= curr->volDescSeqNum) {
1502                                 curr->volDescSeqNum = vdsn;
1503                                 curr->block = block;
1504
1505                                 vdp = (struct volDescPtr *)bh->b_data;
1506                                 next_s = le32_to_cpu(
1507                                         vdp->nextVolDescSeqExt.extLocation);
1508                                 next_e = le32_to_cpu(
1509                                         vdp->nextVolDescSeqExt.extLength);
1510                                 next_e = next_e >> sb->s_blocksize_bits;
1511                                 next_e += next_s;
1512                         }
1513                         break;
1514                 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1515                         curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1516                         if (vdsn >= curr->volDescSeqNum) {
1517                                 curr->volDescSeqNum = vdsn;
1518                                 curr->block = block;
1519                         }
1520                         break;
1521                 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1522                         curr = &vds[VDS_POS_PARTITION_DESC];
1523                         if (!curr->block)
1524                                 curr->block = block;
1525                         break;
1526                 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1527                         curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1528                         if (vdsn >= curr->volDescSeqNum) {
1529                                 curr->volDescSeqNum = vdsn;
1530                                 curr->block = block;
1531                         }
1532                         break;
1533                 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1534                         curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1535                         if (vdsn >= curr->volDescSeqNum) {
1536                                 curr->volDescSeqNum = vdsn;
1537                                 curr->block = block;
1538                         }
1539                         break;
1540                 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1541                         vds[VDS_POS_TERMINATING_DESC].block = block;
1542                         if (next_e) {
1543                                 block = next_s;
1544                                 lastblock = next_e;
1545                                 next_s = next_e = 0;
1546                         } else
1547                                 done = 1;
1548                         break;
1549                 }
1550                 brelse(bh);
1551         }
1552         /*
1553          * Now read interesting descriptors again and process them
1554          * in a suitable order
1555          */
1556         if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1557                 printk(KERN_ERR "udf: Primary Volume Descriptor not found!\n");
1558                 return 1;
1559         }
1560         if (udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block))
1561                 return 1;
1562
1563         if (vds[VDS_POS_LOGICAL_VOL_DESC].block && udf_load_logicalvol(sb,
1564             vds[VDS_POS_LOGICAL_VOL_DESC].block, fileset))
1565                 return 1;
1566
1567         if (vds[VDS_POS_PARTITION_DESC].block) {
1568                 /*
1569                  * We rescan the whole descriptor sequence to find
1570                  * partition descriptor blocks and process them.
1571                  */
1572                 for (block = vds[VDS_POS_PARTITION_DESC].block;
1573                      block < vds[VDS_POS_TERMINATING_DESC].block;
1574                      block++)
1575                         if (udf_load_partdesc(sb, block))
1576                                 return 1;
1577         }
1578
1579         return 0;
1580 }
1581
1582 static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh,
1583                              struct kernel_lb_addr *fileset)
1584 {
1585         struct anchorVolDescPtr *anchor;
1586         long main_s, main_e, reserve_s, reserve_e;
1587
1588         anchor = (struct anchorVolDescPtr *)bh->b_data;
1589
1590         /* Locate the main sequence */
1591         main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1592         main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1593         main_e = main_e >> sb->s_blocksize_bits;
1594         main_e += main_s;
1595
1596         /* Locate the reserve sequence */
1597         reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1598         reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1599         reserve_e = reserve_e >> sb->s_blocksize_bits;
1600         reserve_e += reserve_s;
1601
1602         /* Process the main & reserve sequences */
1603         /* responsible for finding the PartitionDesc(s) */
1604         if (!udf_process_sequence(sb, main_s, main_e, fileset))
1605                 return 1;
1606         return !udf_process_sequence(sb, reserve_s, reserve_e, fileset);
1607 }
1608
1609 /*
1610  * Check whether there is an anchor block in the given block and
1611  * load Volume Descriptor Sequence if so.
1612  */
1613 static int udf_check_anchor_block(struct super_block *sb, sector_t block,
1614                                   struct kernel_lb_addr *fileset)
1615 {
1616         struct buffer_head *bh;
1617         uint16_t ident;
1618         int ret;
1619
1620         if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
1621             udf_fixed_to_variable(block) >=
1622             sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits)
1623                 return 0;
1624
1625         bh = udf_read_tagged(sb, block, block, &ident);
1626         if (!bh)
1627                 return 0;
1628         if (ident != TAG_IDENT_AVDP) {
1629                 brelse(bh);
1630                 return 0;
1631         }
1632         ret = udf_load_sequence(sb, bh, fileset);
1633         brelse(bh);
1634         return ret;
1635 }
1636
1637 /* Search for an anchor volume descriptor pointer */
1638 static sector_t udf_scan_anchors(struct super_block *sb, sector_t lastblock,
1639                                  struct kernel_lb_addr *fileset)
1640 {
1641         sector_t last[6];
1642         int i;
1643         struct udf_sb_info *sbi = UDF_SB(sb);
1644         int last_count = 0;
1645
1646         /* First try user provided anchor */
1647         if (sbi->s_anchor) {
1648                 if (udf_check_anchor_block(sb, sbi->s_anchor, fileset))
1649                         return lastblock;
1650         }
1651         /*
1652          * according to spec, anchor is in either:
1653          *     block 256
1654          *     lastblock-256
1655          *     lastblock
1656          *  however, if the disc isn't closed, it could be 512.
1657          */
1658         if (udf_check_anchor_block(sb, sbi->s_session + 256, fileset))
1659                 return lastblock;
1660         /*
1661          * The trouble is which block is the last one. Drives often misreport
1662          * this so we try various possibilities.
1663          */
1664         last[last_count++] = lastblock;
1665         if (lastblock >= 1)
1666                 last[last_count++] = lastblock - 1;
1667         last[last_count++] = lastblock + 1;
1668         if (lastblock >= 2)
1669                 last[last_count++] = lastblock - 2;
1670         if (lastblock >= 150)
1671                 last[last_count++] = lastblock - 150;
1672         if (lastblock >= 152)
1673                 last[last_count++] = lastblock - 152;
1674
1675         for (i = 0; i < last_count; i++) {
1676                 if (last[i] >= sb->s_bdev->bd_inode->i_size >>
1677                                 sb->s_blocksize_bits)
1678                         continue;
1679                 if (udf_check_anchor_block(sb, last[i], fileset))
1680                         return last[i];
1681                 if (last[i] < 256)
1682                         continue;
1683                 if (udf_check_anchor_block(sb, last[i] - 256, fileset))
1684                         return last[i];
1685         }
1686
1687         /* Finally try block 512 in case media is open */
1688         if (udf_check_anchor_block(sb, sbi->s_session + 512, fileset))
1689                 return last[0];
1690         return 0;
1691 }
1692
1693 /*
1694  * Find an anchor volume descriptor and load Volume Descriptor Sequence from
1695  * area specified by it. The function expects sbi->s_lastblock to be the last
1696  * block on the media.
1697  *
1698  * Return 1 if ok, 0 if not found.
1699  *
1700  */
1701 static int udf_find_anchor(struct super_block *sb,
1702                            struct kernel_lb_addr *fileset)
1703 {
1704         sector_t lastblock;
1705         struct udf_sb_info *sbi = UDF_SB(sb);
1706
1707         lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1708         if (lastblock)
1709                 goto out;
1710
1711         /* No anchor found? Try VARCONV conversion of block numbers */
1712         UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
1713         /* Firstly, we try to not convert number of the last block */
1714         lastblock = udf_scan_anchors(sb,
1715                                 udf_variable_to_fixed(sbi->s_last_block),
1716                                 fileset);
1717         if (lastblock)
1718                 goto out;
1719
1720         /* Secondly, we try with converted number of the last block */
1721         lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1722         if (!lastblock) {
1723                 /* VARCONV didn't help. Clear it. */
1724                 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
1725                 return 0;
1726         }
1727 out:
1728         sbi->s_last_block = lastblock;
1729         return 1;
1730 }
1731
1732 /*
1733  * Check Volume Structure Descriptor, find Anchor block and load Volume
1734  * Descriptor Sequence
1735  */
1736 static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
1737                         int silent, struct kernel_lb_addr *fileset)
1738 {
1739         struct udf_sb_info *sbi = UDF_SB(sb);
1740         loff_t nsr_off;
1741
1742         if (!sb_set_blocksize(sb, uopt->blocksize)) {
1743                 if (!silent)
1744                         printk(KERN_WARNING "UDF-fs: Bad block size\n");
1745                 return 0;
1746         }
1747         sbi->s_last_block = uopt->lastblock;
1748         if (!uopt->novrs) {
1749                 /* Check that it is NSR02 compliant */
1750                 nsr_off = udf_check_vsd(sb);
1751                 if (!nsr_off) {
1752                         if (!silent)
1753                                 printk(KERN_WARNING "UDF-fs: No VRS found\n");
1754                         return 0;
1755                 }
1756                 if (nsr_off == -1)
1757                         udf_debug("Failed to read byte 32768. Assuming open "
1758                                   "disc. Skipping validity check\n");
1759                 if (!sbi->s_last_block)
1760                         sbi->s_last_block = udf_get_last_block(sb);
1761         } else {
1762                 udf_debug("Validity check skipped because of novrs option\n");
1763         }
1764
1765         /* Look for anchor block and load Volume Descriptor Sequence */
1766         sbi->s_anchor = uopt->anchor;
1767         if (!udf_find_anchor(sb, fileset)) {
1768                 if (!silent)
1769                         printk(KERN_WARNING "UDF-fs: No anchor found\n");
1770                 return 0;
1771         }
1772         return 1;
1773 }
1774
1775 static void udf_open_lvid(struct super_block *sb)
1776 {
1777         struct udf_sb_info *sbi = UDF_SB(sb);
1778         struct buffer_head *bh = sbi->s_lvid_bh;
1779         struct logicalVolIntegrityDesc *lvid;
1780         struct logicalVolIntegrityDescImpUse *lvidiu;
1781
1782         if (!bh)
1783                 return;
1784         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1785         lvidiu = udf_sb_lvidiu(sbi);
1786
1787         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1788         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1789         udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
1790                                 CURRENT_TIME);
1791         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN);
1792
1793         lvid->descTag.descCRC = cpu_to_le16(
1794                 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1795                         le16_to_cpu(lvid->descTag.descCRCLength)));
1796
1797         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1798         mark_buffer_dirty(bh);
1799         sbi->s_lvid_dirty = 0;
1800 }
1801
1802 static void udf_close_lvid(struct super_block *sb)
1803 {
1804         struct udf_sb_info *sbi = UDF_SB(sb);
1805         struct buffer_head *bh = sbi->s_lvid_bh;
1806         struct logicalVolIntegrityDesc *lvid;
1807         struct logicalVolIntegrityDescImpUse *lvidiu;
1808
1809         if (!bh)
1810                 return;
1811
1812         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1813         lvidiu = udf_sb_lvidiu(sbi);
1814         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1815         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1816         udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
1817         if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1818                 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1819         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1820                 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1821         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
1822                 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
1823         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1824
1825         lvid->descTag.descCRC = cpu_to_le16(
1826                         crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1827                                 le16_to_cpu(lvid->descTag.descCRCLength)));
1828
1829         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1830         mark_buffer_dirty(bh);
1831         sbi->s_lvid_dirty = 0;
1832 }
1833
1834 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
1835 {
1836         int i;
1837         int nr_groups = bitmap->s_nr_groups;
1838         int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
1839                                                 nr_groups);
1840
1841         for (i = 0; i < nr_groups; i++)
1842                 if (bitmap->s_block_bitmap[i])
1843                         brelse(bitmap->s_block_bitmap[i]);
1844
1845         if (size <= PAGE_SIZE)
1846                 kfree(bitmap);
1847         else
1848                 vfree(bitmap);
1849 }
1850
1851 static void udf_free_partition(struct udf_part_map *map)
1852 {
1853         int i;
1854         struct udf_meta_data *mdata;
1855
1856         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1857                 iput(map->s_uspace.s_table);
1858         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1859                 iput(map->s_fspace.s_table);
1860         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1861                 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
1862         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1863                 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
1864         if (map->s_partition_type == UDF_SPARABLE_MAP15)
1865                 for (i = 0; i < 4; i++)
1866                         brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
1867         else if (map->s_partition_type == UDF_METADATA_MAP25) {
1868                 mdata = &map->s_type_specific.s_metadata;
1869                 iput(mdata->s_metadata_fe);
1870                 mdata->s_metadata_fe = NULL;
1871
1872                 iput(mdata->s_mirror_fe);
1873                 mdata->s_mirror_fe = NULL;
1874
1875                 iput(mdata->s_bitmap_fe);
1876                 mdata->s_bitmap_fe = NULL;
1877         }
1878 }
1879
1880 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1881 {
1882         int i;
1883         int ret;
1884         struct inode *inode = NULL;
1885         struct udf_options uopt;
1886         struct kernel_lb_addr rootdir, fileset;
1887         struct udf_sb_info *sbi;
1888
1889         lock_kernel();
1890
1891         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1892         uopt.uid = -1;
1893         uopt.gid = -1;
1894         uopt.umask = 0;
1895         uopt.fmode = UDF_INVALID_MODE;
1896         uopt.dmode = UDF_INVALID_MODE;
1897
1898         sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1899         if (!sbi) {
1900                 unlock_kernel();
1901                 return -ENOMEM;
1902         }
1903
1904         sb->s_fs_info = sbi;
1905
1906         mutex_init(&sbi->s_alloc_mutex);
1907
1908         if (!udf_parse_options((char *)options, &uopt, false))
1909                 goto error_out;
1910
1911         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1912             uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
1913                 udf_error(sb, "udf_read_super",
1914                           "utf8 cannot be combined with iocharset\n");
1915                 goto error_out;
1916         }
1917 #ifdef CONFIG_UDF_NLS
1918         if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1919                 uopt.nls_map = load_nls_default();
1920                 if (!uopt.nls_map)
1921                         uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1922                 else
1923                         udf_debug("Using default NLS map\n");
1924         }
1925 #endif
1926         if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1927                 uopt.flags |= (1 << UDF_FLAG_UTF8);
1928
1929         fileset.logicalBlockNum = 0xFFFFFFFF;
1930         fileset.partitionReferenceNum = 0xFFFF;
1931
1932         sbi->s_flags = uopt.flags;
1933         sbi->s_uid = uopt.uid;
1934         sbi->s_gid = uopt.gid;
1935         sbi->s_umask = uopt.umask;
1936         sbi->s_fmode = uopt.fmode;
1937         sbi->s_dmode = uopt.dmode;
1938         sbi->s_nls_map = uopt.nls_map;
1939
1940         if (uopt.session == 0xFFFFFFFF)
1941                 sbi->s_session = udf_get_last_session(sb);
1942         else
1943                 sbi->s_session = uopt.session;
1944
1945         udf_debug("Multi-session=%d\n", sbi->s_session);
1946
1947         /* Fill in the rest of the superblock */
1948         sb->s_op = &udf_sb_ops;
1949         sb->s_export_op = &udf_export_ops;
1950
1951         sb->s_dirt = 0;
1952         sb->s_magic = UDF_SUPER_MAGIC;
1953         sb->s_time_gran = 1000;
1954
1955         if (uopt.flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) {
1956                 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1957         } else {
1958                 uopt.blocksize = bdev_logical_block_size(sb->s_bdev);
1959                 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1960                 if (!ret && uopt.blocksize != UDF_DEFAULT_BLOCKSIZE) {
1961                         if (!silent)
1962                                 printk(KERN_NOTICE
1963                                        "UDF-fs: Rescanning with blocksize "
1964                                        "%d\n", UDF_DEFAULT_BLOCKSIZE);
1965                         uopt.blocksize = UDF_DEFAULT_BLOCKSIZE;
1966                         ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1967                 }
1968         }
1969         if (!ret) {
1970                 printk(KERN_WARNING "UDF-fs: No partition found (1)\n");
1971                 goto error_out;
1972         }
1973
1974         udf_debug("Lastblock=%d\n", sbi->s_last_block);
1975
1976         if (sbi->s_lvid_bh) {
1977                 struct logicalVolIntegrityDescImpUse *lvidiu =
1978                                                         udf_sb_lvidiu(sbi);
1979                 uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
1980                 uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
1981                 /* uint16_t maxUDFWriteRev =
1982                                 le16_to_cpu(lvidiu->maxUDFWriteRev); */
1983
1984                 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
1985                         printk(KERN_ERR "UDF-fs: minUDFReadRev=%x "
1986                                         "(max is %x)\n",
1987                                le16_to_cpu(lvidiu->minUDFReadRev),
1988                                UDF_MAX_READ_VERSION);
1989                         goto error_out;
1990                 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
1991                         sb->s_flags |= MS_RDONLY;
1992
1993                 sbi->s_udfrev = minUDFWriteRev;
1994
1995                 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1996                         UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
1997                 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
1998                         UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
1999         }
2000
2001         if (!sbi->s_partitions) {
2002                 printk(KERN_WARNING "UDF-fs: No partition found (2)\n");
2003                 goto error_out;
2004         }
2005
2006         if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
2007                         UDF_PART_FLAG_READ_ONLY) {
2008                 printk(KERN_NOTICE "UDF-fs: Partition marked readonly; "
2009                                    "forcing readonly mount\n");
2010                 sb->s_flags |= MS_RDONLY;
2011         }
2012
2013         if (udf_find_fileset(sb, &fileset, &rootdir)) {
2014                 printk(KERN_WARNING "UDF-fs: No fileset found\n");
2015                 goto error_out;
2016         }
2017
2018         if (!silent) {
2019                 struct timestamp ts;
2020                 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
2021                 udf_info("UDF: Mounting volume '%s', "
2022                          "timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
2023                          sbi->s_volume_ident, le16_to_cpu(ts.year), ts.month, ts.day,
2024                          ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
2025         }
2026         if (!(sb->s_flags & MS_RDONLY))
2027                 udf_open_lvid(sb);
2028
2029         /* Assign the root inode */
2030         /* assign inodes by physical block number */
2031         /* perhaps it's not extensible enough, but for now ... */
2032         inode = udf_iget(sb, &rootdir);
2033         if (!inode) {
2034                 printk(KERN_ERR "UDF-fs: Error in udf_iget, block=%d, "
2035                                 "partition=%d\n",
2036                        rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
2037                 goto error_out;
2038         }
2039
2040         /* Allocate a dentry for the root inode */
2041         sb->s_root = d_alloc_root(inode);
2042         if (!sb->s_root) {
2043                 printk(KERN_ERR "UDF-fs: Couldn't allocate root dentry\n");
2044                 iput(inode);
2045                 goto error_out;
2046         }
2047         sb->s_maxbytes = MAX_LFS_FILESIZE;
2048         unlock_kernel();
2049         return 0;
2050
2051 error_out:
2052         if (sbi->s_vat_inode)
2053                 iput(sbi->s_vat_inode);
2054         if (sbi->s_partitions)
2055                 for (i = 0; i < sbi->s_partitions; i++)
2056                         udf_free_partition(&sbi->s_partmaps[i]);
2057 #ifdef CONFIG_UDF_NLS
2058         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2059                 unload_nls(sbi->s_nls_map);
2060 #endif
2061         if (!(sb->s_flags & MS_RDONLY))
2062                 udf_close_lvid(sb);
2063         brelse(sbi->s_lvid_bh);
2064
2065         kfree(sbi->s_partmaps);
2066         kfree(sbi);
2067         sb->s_fs_info = NULL;
2068
2069         unlock_kernel();
2070         return -EINVAL;
2071 }
2072
2073 static void udf_error(struct super_block *sb, const char *function,
2074                       const char *fmt, ...)
2075 {
2076         va_list args;
2077
2078         if (!(sb->s_flags & MS_RDONLY)) {
2079                 /* mark sb error */
2080                 sb->s_dirt = 1;
2081         }
2082         va_start(args, fmt);
2083         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2084         va_end(args);
2085         printk(KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
2086                 sb->s_id, function, error_buf);
2087 }
2088
2089 void udf_warning(struct super_block *sb, const char *function,
2090                  const char *fmt, ...)
2091 {
2092         va_list args;
2093
2094         va_start(args, fmt);
2095         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2096         va_end(args);
2097         printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
2098                sb->s_id, function, error_buf);
2099 }
2100
2101 static void udf_put_super(struct super_block *sb)
2102 {
2103         int i;
2104         struct udf_sb_info *sbi;
2105
2106         sbi = UDF_SB(sb);
2107
2108         lock_kernel();
2109
2110         if (sbi->s_vat_inode)
2111                 iput(sbi->s_vat_inode);
2112         if (sbi->s_partitions)
2113                 for (i = 0; i < sbi->s_partitions; i++)
2114                         udf_free_partition(&sbi->s_partmaps[i]);
2115 #ifdef CONFIG_UDF_NLS
2116         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2117                 unload_nls(sbi->s_nls_map);
2118 #endif
2119         if (!(sb->s_flags & MS_RDONLY))
2120                 udf_close_lvid(sb);
2121         brelse(sbi->s_lvid_bh);
2122         kfree(sbi->s_partmaps);
2123         kfree(sb->s_fs_info);
2124         sb->s_fs_info = NULL;
2125
2126         unlock_kernel();
2127 }
2128
2129 static int udf_sync_fs(struct super_block *sb, int wait)
2130 {
2131         struct udf_sb_info *sbi = UDF_SB(sb);
2132
2133         mutex_lock(&sbi->s_alloc_mutex);
2134         if (sbi->s_lvid_dirty) {
2135                 /*
2136                  * Blockdevice will be synced later so we don't have to submit
2137                  * the buffer for IO
2138                  */
2139                 mark_buffer_dirty(sbi->s_lvid_bh);
2140                 sb->s_dirt = 0;
2141                 sbi->s_lvid_dirty = 0;
2142         }
2143         mutex_unlock(&sbi->s_alloc_mutex);
2144
2145         return 0;
2146 }
2147
2148 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
2149 {
2150         struct super_block *sb = dentry->d_sb;
2151         struct udf_sb_info *sbi = UDF_SB(sb);
2152         struct logicalVolIntegrityDescImpUse *lvidiu;
2153         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
2154
2155         if (sbi->s_lvid_bh != NULL)
2156                 lvidiu = udf_sb_lvidiu(sbi);
2157         else
2158                 lvidiu = NULL;
2159
2160         buf->f_type = UDF_SUPER_MAGIC;
2161         buf->f_bsize = sb->s_blocksize;
2162         buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
2163         buf->f_bfree = udf_count_free(sb);
2164         buf->f_bavail = buf->f_bfree;
2165         buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2166                                           le32_to_cpu(lvidiu->numDirs)) : 0)
2167                         + buf->f_bfree;
2168         buf->f_ffree = buf->f_bfree;
2169         buf->f_namelen = UDF_NAME_LEN - 2;
2170         buf->f_fsid.val[0] = (u32)id;
2171         buf->f_fsid.val[1] = (u32)(id >> 32);
2172
2173         return 0;
2174 }
2175
2176 static unsigned int udf_count_free_bitmap(struct super_block *sb,
2177                                           struct udf_bitmap *bitmap)
2178 {
2179         struct buffer_head *bh = NULL;
2180         unsigned int accum = 0;
2181         int index;
2182         int block = 0, newblock;
2183         struct kernel_lb_addr loc;
2184         uint32_t bytes;
2185         uint8_t *ptr;
2186         uint16_t ident;
2187         struct spaceBitmapDesc *bm;
2188
2189         lock_kernel();
2190
2191         loc.logicalBlockNum = bitmap->s_extPosition;
2192         loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
2193         bh = udf_read_ptagged(sb, &loc, 0, &ident);
2194
2195         if (!bh) {
2196                 printk(KERN_ERR "udf: udf_count_free failed\n");
2197                 goto out;
2198         } else if (ident != TAG_IDENT_SBD) {
2199                 brelse(bh);
2200                 printk(KERN_ERR "udf: udf_count_free failed\n");
2201                 goto out;
2202         }
2203
2204         bm = (struct spaceBitmapDesc *)bh->b_data;
2205         bytes = le32_to_cpu(bm->numOfBytes);
2206         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2207         ptr = (uint8_t *)bh->b_data;
2208
2209         while (bytes > 0) {
2210                 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2211                 accum += bitmap_weight((const unsigned long *)(ptr + index),
2212                                         cur_bytes * 8);
2213                 bytes -= cur_bytes;
2214                 if (bytes) {
2215                         brelse(bh);
2216                         newblock = udf_get_lb_pblock(sb, &loc, ++block);
2217                         bh = udf_tread(sb, newblock);
2218                         if (!bh) {
2219                                 udf_debug("read failed\n");
2220                                 goto out;
2221                         }
2222                         index = 0;
2223                         ptr = (uint8_t *)bh->b_data;
2224                 }
2225         }
2226         brelse(bh);
2227
2228 out:
2229         unlock_kernel();
2230
2231         return accum;
2232 }
2233
2234 static unsigned int udf_count_free_table(struct super_block *sb,
2235                                          struct inode *table)
2236 {
2237         unsigned int accum = 0;
2238         uint32_t elen;
2239         struct kernel_lb_addr eloc;
2240         int8_t etype;
2241         struct extent_position epos;
2242
2243         lock_kernel();
2244
2245         epos.block = UDF_I(table)->i_location;
2246         epos.offset = sizeof(struct unallocSpaceEntry);
2247         epos.bh = NULL;
2248
2249         while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2250                 accum += (elen >> table->i_sb->s_blocksize_bits);
2251
2252         brelse(epos.bh);
2253
2254         unlock_kernel();
2255
2256         return accum;
2257 }
2258
2259 static unsigned int udf_count_free(struct super_block *sb)
2260 {
2261         unsigned int accum = 0;
2262         struct udf_sb_info *sbi;
2263         struct udf_part_map *map;
2264
2265         sbi = UDF_SB(sb);
2266         if (sbi->s_lvid_bh) {
2267                 struct logicalVolIntegrityDesc *lvid =
2268                         (struct logicalVolIntegrityDesc *)
2269                         sbi->s_lvid_bh->b_data;
2270                 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
2271                         accum = le32_to_cpu(
2272                                         lvid->freeSpaceTable[sbi->s_partition]);
2273                         if (accum == 0xFFFFFFFF)
2274                                 accum = 0;
2275                 }
2276         }
2277
2278         if (accum)
2279                 return accum;
2280
2281         map = &sbi->s_partmaps[sbi->s_partition];
2282         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2283                 accum += udf_count_free_bitmap(sb,
2284                                                map->s_uspace.s_bitmap);
2285         }
2286         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
2287                 accum += udf_count_free_bitmap(sb,
2288                                                map->s_fspace.s_bitmap);
2289         }
2290         if (accum)
2291                 return accum;
2292
2293         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2294                 accum += udf_count_free_table(sb,
2295                                               map->s_uspace.s_table);
2296         }
2297         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
2298                 accum += udf_count_free_table(sb,
2299                                               map->s_fspace.s_table);
2300         }
2301
2302         return accum;
2303 }