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/buffer_head.h>
  52 #include <linux/vfs.h>
  53 #include <linux/vmalloc.h>
  54 #include <linux/errno.h>
  55 #include <linux/mount.h>
  56 #include <linux/seq_file.h>
  57 #include <linux/bitmap.h>
  58 #include <linux/crc-itu-t.h>
  59 #include <asm/byteorder.h>
  60
  61 #include "udf_sb.h"
  62 #include "udf_i.h"
  63
  64 #include <linux/init.h>
  65 #include <asm/uaccess.h>
  66
  67 #define VDS_POS_PRIMARY_VOL_DESC        0
  68 #define VDS_POS_UNALLOC_SPACE_DESC      1
  69 #define VDS_POS_LOGICAL_VOL_DESC        2
  70 #define VDS_POS_PARTITION_DESC          3
  71 #define VDS_POS_IMP_USE_VOL_DESC        4
  72 #define VDS_POS_VOL_DESC_PTR            5
  73 #define VDS_POS_TERMINATING_DESC        6
  74 #define VDS_POS_LENGTH                  7
  75
  76 #define UDF_DEFAULT_BLOCKSIZE 2048
  77
  78 enum { UDF_MAX_LINKS = 0xffff };
  79
  80 /* These are the "meat" - everything else is stuffing */
  81 static int udf_fill_super(struct super_block *, void *, int);
  82 static void udf_put_super(struct super_block *);
  83 static int udf_sync_fs(struct super_block *, int);
  84 static int udf_remount_fs(struct super_block *, int *, char *);
  85 static void udf_load_logicalvolint(struct super_block *, struct kernel_extent_ad);
  86 static int udf_find_fileset(struct super_block *, struct kernel_lb_addr *,
  87                             struct kernel_lb_addr *);
  88 static void udf_load_fileset(struct super_block *, struct buffer_head *,
  89                              struct kernel_lb_addr *);
  90 static void udf_open_lvid(struct super_block *);
  91 static void udf_close_lvid(struct super_block *);
  92 static unsigned int udf_count_free(struct super_block *);
  93 static int udf_statfs(struct dentry *, struct kstatfs *);
  94 static int udf_show_options(struct seq_file *, struct dentry *);
  95
  96 struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct udf_sb_info *sbi)
  97 {
  98         struct logicalVolIntegrityDesc *lvid =
  99                 (struct logicalVolIntegrityDesc *)sbi->s_lvid_bh->b_data;
 100         __u32 number_of_partitions = le32_to_cpu(lvid->numOfPartitions);
 101         __u32 offset = number_of_partitions * 2 *
 102                                 sizeof(uint32_t)/sizeof(uint8_t);
 103         return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
 104 }
 105
 106 /* UDF filesystem type */
 107 static struct dentry *udf_mount(struct file_system_type *fs_type,
 108                       int flags, const char *dev_name, void *data)
 109 {
 110         return mount_bdev(fs_type, flags, dev_name, data, udf_fill_super);
 111 }
 112
 113 static struct file_system_type udf_fstype = {
 114         .owner          = THIS_MODULE,
 115         .name           = "udf",
 116         .mount          = udf_mount,
 117         .kill_sb        = kill_block_super,
 118         .fs_flags       = FS_REQUIRES_DEV,
 119 };
 120
 121 static struct kmem_cache *udf_inode_cachep;
 122
 123 static struct inode *udf_alloc_inode(struct super_block *sb)
 124 {
 125         struct udf_inode_info *ei;
 126         ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
 127         if (!ei)
 128                 return NULL;
 129
 130         ei->i_unique = 0;
 131         ei->i_lenExtents = 0;
 132         ei->i_next_alloc_block = 0;
 133         ei->i_next_alloc_goal = 0;
 134         ei->i_strat4096 = 0;
 135         init_rwsem(&ei->i_data_sem);
 136
 137         return &ei->vfs_inode;
 138 }
 139
 140 static void udf_i_callback(struct rcu_head *head)
 141 {
 142         struct inode *inode = container_of(head, struct inode, i_rcu);
 143         kmem_cache_free(udf_inode_cachep, UDF_I(inode));
 144 }
 145
 146 static void udf_destroy_inode(struct inode *inode)
 147 {
 148         call_rcu(&inode->i_rcu, udf_i_callback);
 149 }
 150
 151 static void init_once(void *foo)
 152 {
 153         struct udf_inode_info *ei = (struct udf_inode_info *)foo;
 154
 155         ei->i_ext.i_data = NULL;
 156         inode_init_once(&ei->vfs_inode);
 157 }
 158
 159 static int init_inodecache(void)
 160 {
 161         udf_inode_cachep = kmem_cache_create("udf_inode_cache",
 162                                              sizeof(struct udf_inode_info),
 163                                              0, (SLAB_RECLAIM_ACCOUNT |
 164                                                  SLAB_MEM_SPREAD),
 165                                              init_once);
 166         if (!udf_inode_cachep)
 167                 return -ENOMEM;
 168         return 0;
 169 }
 170
 171 static void destroy_inodecache(void)
 172 {
 173         kmem_cache_destroy(udf_inode_cachep);
 174 }
 175
 176 /* Superblock operations */
 177 static const struct super_operations udf_sb_ops = {
 178         .alloc_inode    = udf_alloc_inode,
 179         .destroy_inode  = udf_destroy_inode,
 180         .write_inode    = udf_write_inode,
 181         .evict_inode    = udf_evict_inode,
 182         .put_super      = udf_put_super,
 183         .sync_fs        = udf_sync_fs,
 184         .statfs         = udf_statfs,
 185         .remount_fs     = udf_remount_fs,
 186         .show_options   = udf_show_options,
 187 };
 188
 189 struct udf_options {
 190         unsigned char novrs;
 191         unsigned int blocksize;
 192         unsigned int session;
 193         unsigned int lastblock;
 194         unsigned int anchor;
 195         unsigned int volume;
 196         unsigned short partition;
 197         unsigned int fileset;
 198         unsigned int rootdir;
 199         unsigned int flags;
 200         umode_t umask;
 201         gid_t gid;
 202         uid_t uid;
 203         umode_t fmode;
 204         umode_t dmode;
 205         struct nls_table *nls_map;
 206 };
 207
 208 static int __init init_udf_fs(void)
 209 {
 210         int err;
 211
 212         err = init_inodecache();
 213         if (err)
 214                 goto out1;
 215         err = register_filesystem(&udf_fstype);
 216         if (err)
 217                 goto out;
 218
 219         return 0;
 220
 221 out:
 222         destroy_inodecache();
 223
 224 out1:
 225         return err;
 226 }
 227
 228 static void __exit exit_udf_fs(void)
 229 {
 230         unregister_filesystem(&udf_fstype);
 231         destroy_inodecache();
 232 }
 233
 234 module_init(init_udf_fs)
 235 module_exit(exit_udf_fs)
 236
 237 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
 238 {
 239         struct udf_sb_info *sbi = UDF_SB(sb);
 240
 241         sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map),
 242                                   GFP_KERNEL);
 243         if (!sbi->s_partmaps) {
 244                 udf_err(sb, "Unable to allocate space for %d partition maps\n",
 245                         count);
 246                 sbi->s_partitions = 0;
 247                 return -ENOMEM;
 248         }
 249
 250         sbi->s_partitions = count;
 251         return 0;
 252 }
 253
 254 static int udf_show_options(struct seq_file *seq, struct dentry *root)
 255 {
 256         struct super_block *sb = root->d_sb;
 257         struct udf_sb_info *sbi = UDF_SB(sb);
 258
 259         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
 260                 seq_puts(seq, ",nostrict");
 261         if (UDF_QUERY_FLAG(sb, UDF_FLAG_BLOCKSIZE_SET))
 262                 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
 263         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
 264                 seq_puts(seq, ",unhide");
 265         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
 266                 seq_puts(seq, ",undelete");
 267         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
 268                 seq_puts(seq, ",noadinicb");
 269         if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
 270                 seq_puts(seq, ",shortad");
 271         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
 272                 seq_puts(seq, ",uid=forget");
 273         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_IGNORE))
 274                 seq_puts(seq, ",uid=ignore");
 275         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
 276                 seq_puts(seq, ",gid=forget");
 277         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE))
 278                 seq_puts(seq, ",gid=ignore");
 279         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
 280                 seq_printf(seq, ",uid=%u", sbi->s_uid);
 281         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
 282                 seq_printf(seq, ",gid=%u", sbi->s_gid);
 283         if (sbi->s_umask != 0)
 284                 seq_printf(seq, ",umask=%ho", sbi->s_umask);
 285         if (sbi->s_fmode != UDF_INVALID_MODE)
 286                 seq_printf(seq, ",mode=%ho", sbi->s_fmode);
 287         if (sbi->s_dmode != UDF_INVALID_MODE)
 288                 seq_printf(seq, ",dmode=%ho", sbi->s_dmode);
 289         if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
 290                 seq_printf(seq, ",session=%u", sbi->s_session);
 291         if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
 292                 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
 293         if (sbi->s_anchor != 0)
 294                 seq_printf(seq, ",anchor=%u", sbi->s_anchor);
 295         /*
 296          * volume, partition, fileset and rootdir seem to be ignored
 297          * currently
 298          */
 299         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
 300                 seq_puts(seq, ",utf8");
 301         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
 302                 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
 303
 304         return 0;
 305 }
 306
 307 /*
 308  * udf_parse_options
 309  *
 310  * PURPOSE
 311  *      Parse mount options.
 312  *
 313  * DESCRIPTION
 314  *      The following mount options are supported:
 315  *
 316  *      gid=            Set the default group.
 317  *      umask=          Set the default umask.
 318  *      mode=           Set the default file permissions.
 319  *      dmode=          Set the default directory permissions.
 320  *      uid=            Set the default user.
 321  *      bs=             Set the block size.
 322  *      unhide          Show otherwise hidden files.
 323  *      undelete        Show deleted files in lists.
 324  *      adinicb         Embed data in the inode (default)
 325  *      noadinicb       Don't embed data in the inode
 326  *      shortad         Use short ad's
 327  *      longad          Use long ad's (default)
 328  *      nostrict        Unset strict conformance
 329  *      iocharset=      Set the NLS character set
 330  *
 331  *      The remaining are for debugging and disaster recovery:
 332  *
 333  *      novrs           Skip volume sequence recognition
 334  *
 335  *      The following expect a offset from 0.
 336  *
 337  *      session=        Set the CDROM session (default= last session)
 338  *      anchor=         Override standard anchor location. (default= 256)
 339  *      volume=         Override the VolumeDesc location. (unused)
 340  *      partition=      Override the PartitionDesc location. (unused)
 341  *      lastblock=      Set the last block of the filesystem/
 342  *
 343  *      The following expect a offset from the partition root.
 344  *
 345  *      fileset=        Override the fileset block location. (unused)
 346  *      rootdir=        Override the root directory location. (unused)
 347  *              WARNING: overriding the rootdir to a non-directory may
 348  *              yield highly unpredictable results.
 349  *
 350  * PRE-CONDITIONS
 351  *      options         Pointer to mount options string.
 352  *      uopts           Pointer to mount options variable.
 353  *
 354  * POST-CONDITIONS
 355  *      <return>        1       Mount options parsed okay.
 356  *      <return>        0       Error parsing mount options.
 357  *
 358  * HISTORY
 359  *      July 1, 1997 - Andrew E. Mileski
 360  *      Written, tested, and released.
 361  */
 362
 363 enum {
 364         Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
 365         Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
 366         Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
 367         Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
 368         Opt_rootdir, Opt_utf8, Opt_iocharset,
 369         Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore,
 370         Opt_fmode, Opt_dmode
 371 };
 372
 373 static const match_table_t tokens = {
 374         {Opt_novrs,     "novrs"},
 375         {Opt_nostrict,  "nostrict"},
 376         {Opt_bs,        "bs=%u"},
 377         {Opt_unhide,    "unhide"},
 378         {Opt_undelete,  "undelete"},
 379         {Opt_noadinicb, "noadinicb"},
 380         {Opt_adinicb,   "adinicb"},
 381         {Opt_shortad,   "shortad"},
 382         {Opt_longad,    "longad"},
 383         {Opt_uforget,   "uid=forget"},
 384         {Opt_uignore,   "uid=ignore"},
 385         {Opt_gforget,   "gid=forget"},
 386         {Opt_gignore,   "gid=ignore"},
 387         {Opt_gid,       "gid=%u"},
 388         {Opt_uid,       "uid=%u"},
 389         {Opt_umask,     "umask=%o"},
 390         {Opt_session,   "session=%u"},
 391         {Opt_lastblock, "lastblock=%u"},
 392         {Opt_anchor,    "anchor=%u"},
 393         {Opt_volume,    "volume=%u"},
 394         {Opt_partition, "partition=%u"},
 395         {Opt_fileset,   "fileset=%u"},
 396         {Opt_rootdir,   "rootdir=%u"},
 397         {Opt_utf8,      "utf8"},
 398         {Opt_iocharset, "iocharset=%s"},
 399         {Opt_fmode,     "mode=%o"},
 400         {Opt_dmode,     "dmode=%o"},
 401         {Opt_err,       NULL}
 402 };
 403
 404 static int udf_parse_options(char *options, struct udf_options *uopt,
 405                              bool remount)
 406 {
 407         char *p;
 408         int option;
 409
 410         uopt->novrs = 0;
 411         uopt->partition = 0xFFFF;
 412         uopt->session = 0xFFFFFFFF;
 413         uopt->lastblock = 0;
 414         uopt->anchor = 0;
 415         uopt->volume = 0xFFFFFFFF;
 416         uopt->rootdir = 0xFFFFFFFF;
 417         uopt->fileset = 0xFFFFFFFF;
 418         uopt->nls_map = NULL;
 419
 420         if (!options)
 421                 return 1;
 422
 423         while ((p = strsep(&options, ",")) != NULL) {
 424                 substring_t args[MAX_OPT_ARGS];
 425                 int token;
 426                 if (!*p)
 427                         continue;
 428
 429                 token = match_token(p, tokens, args);
 430                 switch (token) {
 431                 case Opt_novrs:
 432                         uopt->novrs = 1;
 433                         break;
 434                 case Opt_bs:
 435                         if (match_int(&args[0], &option))
 436                                 return 0;
 437                         uopt->blocksize = option;
 438                         uopt->flags |= (1 << UDF_FLAG_BLOCKSIZE_SET);
 439                         break;
 440                 case Opt_unhide:
 441                         uopt->flags |= (1 << UDF_FLAG_UNHIDE);
 442                         break;
 443                 case Opt_undelete:
 444                         uopt->flags |= (1 << UDF_FLAG_UNDELETE);
 445                         break;
 446                 case Opt_noadinicb:
 447                         uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
 448                         break;
 449                 case Opt_adinicb:
 450                         uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
 451                         break;
 452                 case Opt_shortad:
 453                         uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
 454                         break;
 455                 case Opt_longad:
 456                         uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
 457                         break;
 458                 case Opt_gid:
 459                         if (match_int(args, &option))
 460                                 return 0;
 461                         uopt->gid = option;
 462                         uopt->flags |= (1 << UDF_FLAG_GID_SET);
 463                         break;
 464                 case Opt_uid:
 465                         if (match_int(args, &option))
 466                                 return 0;
 467                         uopt->uid = option;
 468                         uopt->flags |= (1 << UDF_FLAG_UID_SET);
 469                         break;
 470                 case Opt_umask:
 471                         if (match_octal(args, &option))
 472                                 return 0;
 473                         uopt->umask = option;
 474                         break;
 475                 case Opt_nostrict:
 476                         uopt->flags &= ~(1 << UDF_FLAG_STRICT);
 477                         break;
 478                 case Opt_session:
 479                         if (match_int(args, &option))
 480                                 return 0;
 481                         uopt->session = option;
 482                         if (!remount)
 483                                 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
 484                         break;
 485                 case Opt_lastblock:
 486                         if (match_int(args, &option))
 487                                 return 0;
 488                         uopt->lastblock = option;
 489                         if (!remount)
 490                                 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
 491                         break;
 492                 case Opt_anchor:
 493                         if (match_int(args, &option))
 494                                 return 0;
 495                         uopt->anchor = option;
 496                         break;
 497                 case Opt_volume:
 498                         if (match_int(args, &option))
 499                                 return 0;
 500                         uopt->volume = option;
 501                         break;
 502                 case Opt_partition:
 503                         if (match_int(args, &option))
 504                                 return 0;
 505                         uopt->partition = option;
 506                         break;
 507                 case Opt_fileset:
 508                         if (match_int(args, &option))
 509                                 return 0;
 510                         uopt->fileset = option;
 511                         break;
 512                 case Opt_rootdir:
 513                         if (match_int(args, &option))
 514                                 return 0;
 515                         uopt->rootdir = option;
 516                         break;
 517                 case Opt_utf8:
 518                         uopt->flags |= (1 << UDF_FLAG_UTF8);
 519                         break;
 520 #ifdef CONFIG_UDF_NLS
 521                 case Opt_iocharset:
 522                         uopt->nls_map = load_nls(args[0].from);
 523                         uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
 524                         break;
 525 #endif
 526                 case Opt_uignore:
 527                         uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
 528                         break;
 529                 case Opt_uforget:
 530                         uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
 531                         break;
 532                 case Opt_gignore:
 533                         uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
 534                         break;
 535                 case Opt_gforget:
 536                         uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
 537                         break;
 538                 case Opt_fmode:
 539                         if (match_octal(args, &option))
 540                                 return 0;
 541                         uopt->fmode = option & 0777;
 542                         break;
 543                 case Opt_dmode:
 544                         if (match_octal(args, &option))
 545                                 return 0;
 546                         uopt->dmode = option & 0777;
 547                         break;
 548                 default:
 549                         pr_err("bad mount option \"%s\" or missing value\n", p);
 550                         return 0;
 551                 }
 552         }
 553         return 1;
 554 }
 555
 556 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
 557 {
 558         struct udf_options uopt;
 559         struct udf_sb_info *sbi = UDF_SB(sb);
 560         int error = 0;
 561
 562         uopt.flags = sbi->s_flags;
 563         uopt.uid   = sbi->s_uid;
 564         uopt.gid   = sbi->s_gid;
 565         uopt.umask = sbi->s_umask;
 566         uopt.fmode = sbi->s_fmode;
 567         uopt.dmode = sbi->s_dmode;
 568
 569         if (!udf_parse_options(options, &uopt, true))
 570                 return -EINVAL;
 571
 572         write_lock(&sbi->s_cred_lock);
 573         sbi->s_flags = uopt.flags;
 574         sbi->s_uid   = uopt.uid;
 575         sbi->s_gid   = uopt.gid;
 576         sbi->s_umask = uopt.umask;
 577         sbi->s_fmode = uopt.fmode;
 578         sbi->s_dmode = uopt.dmode;
 579         write_unlock(&sbi->s_cred_lock);
 580
 581         if (sbi->s_lvid_bh) {
 582                 int write_rev = le16_to_cpu(udf_sb_lvidiu(sbi)->minUDFWriteRev);
 583                 if (write_rev > UDF_MAX_WRITE_VERSION)
 584                         *flags |= MS_RDONLY;
 585         }
 586
 587         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 588                 goto out_unlock;
 589
 590         if (*flags & MS_RDONLY)
 591                 udf_close_lvid(sb);
 592         else
 593                 udf_open_lvid(sb);
 594
 595 out_unlock:
 596         return error;
 597 }
 598
 599 /* Check Volume Structure Descriptors (ECMA 167 2/9.1) */
 600 /* We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
 601 static loff_t udf_check_vsd(struct super_block *sb)
 602 {
 603         struct volStructDesc *vsd = NULL;
 604         loff_t sector = 32768;
 605         int sectorsize;
 606         struct buffer_head *bh = NULL;
 607         int nsr02 = 0;
 608         int nsr03 = 0;
 609         struct udf_sb_info *sbi;
 610
 611         sbi = UDF_SB(sb);
 612         if (sb->s_blocksize < sizeof(struct volStructDesc))
 613                 sectorsize = sizeof(struct volStructDesc);
 614         else
 615                 sectorsize = sb->s_blocksize;
 616
 617         sector += (sbi->s_session << sb->s_blocksize_bits);
 618
 619         udf_debug("Starting at sector %u (%ld byte sectors)\n",
 620                   (unsigned int)(sector >> sb->s_blocksize_bits),
 621                   sb->s_blocksize);
 622         /* Process the sequence (if applicable) */
 623         for (; !nsr02 && !nsr03; sector += sectorsize) {
 624                 /* Read a block */
 625                 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
 626                 if (!bh)
 627                         break;
 628
 629                 /* Look for ISO  descriptors */
 630                 vsd = (struct volStructDesc *)(bh->b_data +
 631                                               (sector & (sb->s_blocksize - 1)));
 632
 633                 if (vsd->stdIdent[0] == 0) {
 634                         brelse(bh);
 635                         break;
 636                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
 637                                     VSD_STD_ID_LEN)) {
 638                         switch (vsd->structType) {
 639                         case 0:
 640                                 udf_debug("ISO9660 Boot Record found\n");
 641                                 break;
 642                         case 1:
 643                                 udf_debug("ISO9660 Primary Volume Descriptor found\n");
 644                                 break;
 645                         case 2:
 646                                 udf_debug("ISO9660 Supplementary Volume Descriptor found\n");
 647                                 break;
 648                         case 3:
 649                                 udf_debug("ISO9660 Volume Partition Descriptor found\n");
 650                                 break;
 651                         case 255:
 652                                 udf_debug("ISO9660 Volume Descriptor Set Terminator found\n");
 653                                 break;
 654                         default:
 655                                 udf_debug("ISO9660 VRS (%u) found\n",
 656                                           vsd->structType);
 657                                 break;
 658                         }
 659                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
 660                                     VSD_STD_ID_LEN))
 661                         ; /* nothing */
 662                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
 663                                     VSD_STD_ID_LEN)) {
 664                         brelse(bh);
 665                         break;
 666                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
 667                                     VSD_STD_ID_LEN))
 668                         nsr02 = sector;
 669                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
 670                                     VSD_STD_ID_LEN))
 671                         nsr03 = sector;
 672                 brelse(bh);
 673         }
 674
 675         if (nsr03)
 676                 return nsr03;
 677         else if (nsr02)
 678                 return nsr02;
 679         else if (sector - (sbi->s_session << sb->s_blocksize_bits) == 32768)
 680                 return -1;
 681         else
 682                 return 0;
 683 }
 684
 685 static int udf_find_fileset(struct super_block *sb,
 686                             struct kernel_lb_addr *fileset,
 687                             struct kernel_lb_addr *root)
 688 {
 689         struct buffer_head *bh = NULL;
 690         long lastblock;
 691         uint16_t ident;
 692         struct udf_sb_info *sbi;
 693
 694         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
 695             fileset->partitionReferenceNum != 0xFFFF) {
 696                 bh = udf_read_ptagged(sb, fileset, 0, &ident);
 697
 698                 if (!bh) {
 699                         return 1;
 700                 } else if (ident != TAG_IDENT_FSD) {
 701                         brelse(bh);
 702                         return 1;
 703                 }
 704
 705         }
 706
 707         sbi = UDF_SB(sb);
 708         if (!bh) {
 709                 /* Search backwards through the partitions */
 710                 struct kernel_lb_addr newfileset;
 711
 712 /* --> cvg: FIXME - is it reasonable? */
 713                 return 1;
 714
 715                 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
 716                      (newfileset.partitionReferenceNum != 0xFFFF &&
 717                       fileset->logicalBlockNum == 0xFFFFFFFF &&
 718                       fileset->partitionReferenceNum == 0xFFFF);
 719                      newfileset.partitionReferenceNum--) {
 720                         lastblock = sbi->s_partmaps
 721                                         [newfileset.partitionReferenceNum]
 722                                                 .s_partition_len;
 723                         newfileset.logicalBlockNum = 0;
 724
 725                         do {
 726                                 bh = udf_read_ptagged(sb, &newfileset, 0,
 727                                                       &ident);
 728                                 if (!bh) {
 729                                         newfileset.logicalBlockNum++;
 730                                         continue;
 731                                 }
 732
 733                                 switch (ident) {
 734                                 case TAG_IDENT_SBD:
 735                                 {
 736                                         struct spaceBitmapDesc *sp;
 737                                         sp = (struct spaceBitmapDesc *)
 738                                                                 bh->b_data;
 739                                         newfileset.logicalBlockNum += 1 +
 740                                                 ((le32_to_cpu(sp->numOfBytes) +
 741                                                   sizeof(struct spaceBitmapDesc)
 742                                                   - 1) >> sb->s_blocksize_bits);
 743                                         brelse(bh);
 744                                         break;
 745                                 }
 746                                 case TAG_IDENT_FSD:
 747                                         *fileset = newfileset;
 748                                         break;
 749                                 default:
 750                                         newfileset.logicalBlockNum++;
 751                                         brelse(bh);
 752                                         bh = NULL;
 753                                         break;
 754                                 }
 755                         } while (newfileset.logicalBlockNum < lastblock &&
 756                                  fileset->logicalBlockNum == 0xFFFFFFFF &&
 757                                  fileset->partitionReferenceNum == 0xFFFF);
 758                 }
 759         }
 760
 761         if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
 762              fileset->partitionReferenceNum != 0xFFFF) && bh) {
 763                 udf_debug("Fileset at block=%d, partition=%d\n",
 764                           fileset->logicalBlockNum,
 765                           fileset->partitionReferenceNum);
 766
 767                 sbi->s_partition = fileset->partitionReferenceNum;
 768                 udf_load_fileset(sb, bh, root);
 769                 brelse(bh);
 770                 return 0;
 771         }
 772         return 1;
 773 }
 774
 775 static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
 776 {
 777         struct primaryVolDesc *pvoldesc;
 778         struct ustr *instr, *outstr;
 779         struct buffer_head *bh;
 780         uint16_t ident;
 781         int ret = 1;
 782
 783         instr = kmalloc(sizeof(struct ustr), GFP_NOFS);
 784         if (!instr)
 785                 return 1;
 786
 787         outstr = kmalloc(sizeof(struct ustr), GFP_NOFS);
 788         if (!outstr)
 789                 goto out1;
 790
 791         bh = udf_read_tagged(sb, block, block, &ident);
 792         if (!bh)
 793                 goto out2;
 794
 795         BUG_ON(ident != TAG_IDENT_PVD);
 796
 797         pvoldesc = (struct primaryVolDesc *)bh->b_data;
 798
 799         if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
 800                               pvoldesc->recordingDateAndTime)) {
 801 #ifdef UDFFS_DEBUG
 802                 struct timestamp *ts = &pvoldesc->recordingDateAndTime;
 803                 udf_debug("recording time %04u/%02u/%02u %02u:%02u (%x)\n",
 804                           le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
 805                           ts->minute, le16_to_cpu(ts->typeAndTimezone));
 806 #endif
 807         }
 808
 809         if (!udf_build_ustr(instr, pvoldesc->volIdent, 32))
 810                 if (udf_CS0toUTF8(outstr, instr)) {
 811                         strncpy(UDF_SB(sb)->s_volume_ident, outstr->u_name,
 812                                 outstr->u_len > 31 ? 31 : outstr->u_len);
 813                         udf_debug("volIdent[] = '%s'\n",
 814                                   UDF_SB(sb)->s_volume_ident);
 815                 }
 816
 817         if (!udf_build_ustr(instr, pvoldesc->volSetIdent, 128))
 818                 if (udf_CS0toUTF8(outstr, instr))
 819                         udf_debug("volSetIdent[] = '%s'\n", outstr->u_name);
 820
 821         brelse(bh);
 822         ret = 0;
 823 out2:
 824         kfree(outstr);
 825 out1:
 826         kfree(instr);
 827         return ret;
 828 }
 829
 830 struct inode *udf_find_metadata_inode_efe(struct super_block *sb,
 831                                         u32 meta_file_loc, u32 partition_num)
 832 {
 833         struct kernel_lb_addr addr;
 834         struct inode *metadata_fe;
 835
 836         addr.logicalBlockNum = meta_file_loc;
 837         addr.partitionReferenceNum = partition_num;
 838
 839         metadata_fe = udf_iget(sb, &addr);
 840
 841         if (metadata_fe == NULL)
 842                 udf_warn(sb, "metadata inode efe not found\n");
 843         else if (UDF_I(metadata_fe)->i_alloc_type != ICBTAG_FLAG_AD_SHORT) {
 844                 udf_warn(sb, "metadata inode efe does not have short allocation descriptors!\n");
 845                 iput(metadata_fe);
 846                 metadata_fe = NULL;
 847         }
 848
 849         return metadata_fe;
 850 }
 851
 852 static int udf_load_metadata_files(struct super_block *sb, int partition)
 853 {
 854         struct udf_sb_info *sbi = UDF_SB(sb);
 855         struct udf_part_map *map;
 856         struct udf_meta_data *mdata;
 857         struct kernel_lb_addr addr;
 858
 859         map = &sbi->s_partmaps[partition];
 860         mdata = &map->s_type_specific.s_metadata;
 861
 862         /* metadata address */
 863         udf_debug("Metadata file location: block = %d part = %d\n",
 864                   mdata->s_meta_file_loc, map->s_partition_num);
 865
 866         mdata->s_metadata_fe = udf_find_metadata_inode_efe(sb,
 867                 mdata->s_meta_file_loc, map->s_partition_num);
 868
 869         if (mdata->s_metadata_fe == NULL) {
 870                 /* mirror file entry */
 871                 udf_debug("Mirror metadata file location: block = %d part = %d\n",
 872                           mdata->s_mirror_file_loc, map->s_partition_num);
 873
 874                 mdata->s_mirror_fe = udf_find_metadata_inode_efe(sb,
 875                         mdata->s_mirror_file_loc, map->s_partition_num);
 876
 877                 if (mdata->s_mirror_fe == NULL) {
 878                         udf_err(sb, "Both metadata and mirror metadata inode efe can not found\n");
 879                         goto error_exit;
 880                 }
 881         }
 882
 883         /*
 884          * bitmap file entry
 885          * Note:
 886          * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
 887         */
 888         if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
 889                 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
 890                 addr.partitionReferenceNum = map->s_partition_num;
 891
 892                 udf_debug("Bitmap file location: block = %d part = %d\n",
 893                           addr.logicalBlockNum, addr.partitionReferenceNum);
 894
 895                 mdata->s_bitmap_fe = udf_iget(sb, &addr);
 896
 897                 if (mdata->s_bitmap_fe == NULL) {
 898                         if (sb->s_flags & MS_RDONLY)
 899                                 udf_warn(sb, "bitmap inode efe not found but it's ok since the disc is mounted read-only\n");
 900                         else {
 901                                 udf_err(sb, "bitmap inode efe not found and attempted read-write mount\n");
 902                                 goto error_exit;
 903                         }
 904                 }
 905         }
 906
 907         udf_debug("udf_load_metadata_files Ok\n");
 908
 909         return 0;
 910
 911 error_exit:
 912         return 1;
 913 }
 914
 915 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
 916                              struct kernel_lb_addr *root)
 917 {
 918         struct fileSetDesc *fset;
 919
 920         fset = (struct fileSetDesc *)bh->b_data;
 921
 922         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
 923
 924         UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
 925
 926         udf_debug("Rootdir at block=%d, partition=%d\n",
 927                   root->logicalBlockNum, root->partitionReferenceNum);
 928 }
 929
 930 int udf_compute_nr_groups(struct super_block *sb, u32 partition)
 931 {
 932         struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
 933         return DIV_ROUND_UP(map->s_partition_len +
 934                             (sizeof(struct spaceBitmapDesc) << 3),
 935                             sb->s_blocksize * 8);
 936 }
 937
 938 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
 939 {
 940         struct udf_bitmap *bitmap;
 941         int nr_groups;
 942         int size;
 943
 944         nr_groups = udf_compute_nr_groups(sb, index);
 945         size = sizeof(struct udf_bitmap) +
 946                 (sizeof(struct buffer_head *) * nr_groups);
 947
 948         if (size <= PAGE_SIZE)
 949                 bitmap = kzalloc(size, GFP_KERNEL);
 950         else
 951                 bitmap = vzalloc(size); /* TODO: get rid of vzalloc */
 952
 953         if (bitmap == NULL)
 954                 return NULL;
 955
 956         bitmap->s_block_bitmap = (struct buffer_head **)(bitmap + 1);
 957         bitmap->s_nr_groups = nr_groups;
 958         return bitmap;
 959 }
 960
 961 static int udf_fill_partdesc_info(struct super_block *sb,
 962                 struct partitionDesc *p, int p_index)
 963 {
 964         struct udf_part_map *map;
 965         struct udf_sb_info *sbi = UDF_SB(sb);
 966         struct partitionHeaderDesc *phd;
 967
 968         map = &sbi->s_partmaps[p_index];
 969
 970         map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
 971         map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
 972
 973         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
 974                 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
 975         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
 976                 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
 977         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
 978                 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
 979         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
 980                 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
 981
 982         udf_debug("Partition (%d type %x) starts at physical %d, block length %d\n",
 983                   p_index, map->s_partition_type,
 984                   map->s_partition_root, map->s_partition_len);
 985
 986         if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
 987             strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
 988                 return 0;
 989
 990         phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
 991         if (phd->unallocSpaceTable.extLength) {
 992                 struct kernel_lb_addr loc = {
 993                         .logicalBlockNum = le32_to_cpu(
 994                                 phd->unallocSpaceTable.extPosition),
 995                         .partitionReferenceNum = p_index,
 996                 };
 997
 998                 map->s_uspace.s_table = udf_iget(sb, &loc);
 999                 if (!map->s_uspace.s_table) {
1000                         udf_debug("cannot load unallocSpaceTable (part %d)\n",
1001                                   p_index);
1002                         return 1;
1003                 }
1004                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1005                 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
1006                           p_index, map->s_uspace.s_table->i_ino);
1007         }
1008
1009         if (phd->unallocSpaceBitmap.extLength) {
1010                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1011                 if (!bitmap)
1012                         return 1;
1013                 map->s_uspace.s_bitmap = bitmap;
1014                 bitmap->s_extLength = le32_to_cpu(
1015                                 phd->unallocSpaceBitmap.extLength);
1016                 bitmap->s_extPosition = le32_to_cpu(
1017                                 phd->unallocSpaceBitmap.extPosition);
1018                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1019                 udf_debug("unallocSpaceBitmap (part %d) @ %d\n",
1020                           p_index, bitmap->s_extPosition);
1021         }
1022
1023         if (phd->partitionIntegrityTable.extLength)
1024                 udf_debug("partitionIntegrityTable (part %d)\n", p_index);
1025
1026         if (phd->freedSpaceTable.extLength) {
1027                 struct kernel_lb_addr loc = {
1028                         .logicalBlockNum = le32_to_cpu(
1029                                 phd->freedSpaceTable.extPosition),
1030                         .partitionReferenceNum = p_index,
1031                 };
1032
1033                 map->s_fspace.s_table = udf_iget(sb, &loc);
1034                 if (!map->s_fspace.s_table) {
1035                         udf_debug("cannot load freedSpaceTable (part %d)\n",
1036                                   p_index);
1037                         return 1;
1038                 }
1039
1040                 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
1041                 udf_debug("freedSpaceTable (part %d) @ %ld\n",
1042                           p_index, map->s_fspace.s_table->i_ino);
1043         }
1044
1045         if (phd->freedSpaceBitmap.extLength) {
1046                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1047                 if (!bitmap)
1048                         return 1;
1049                 map->s_fspace.s_bitmap = bitmap;
1050                 bitmap->s_extLength = le32_to_cpu(
1051                                 phd->freedSpaceBitmap.extLength);
1052                 bitmap->s_extPosition = le32_to_cpu(
1053                                 phd->freedSpaceBitmap.extPosition);
1054                 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1055                 udf_debug("freedSpaceBitmap (part %d) @ %d\n",
1056                           p_index, bitmap->s_extPosition);
1057         }
1058         return 0;
1059 }
1060
1061 static void udf_find_vat_block(struct super_block *sb, int p_index,
1062                                int type1_index, sector_t start_block)
1063 {
1064         struct udf_sb_info *sbi = UDF_SB(sb);
1065         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1066         sector_t vat_block;
1067         struct kernel_lb_addr ino;
1068
1069         /*
1070          * VAT file entry is in the last recorded block. Some broken disks have
1071          * it a few blocks before so try a bit harder...
1072          */
1073         ino.partitionReferenceNum = type1_index;
1074         for (vat_block = start_block;
1075              vat_block >= map->s_partition_root &&
1076              vat_block >= start_block - 3 &&
1077              !sbi->s_vat_inode; vat_block--) {
1078                 ino.logicalBlockNum = vat_block - map->s_partition_root;
1079                 sbi->s_vat_inode = udf_iget(sb, &ino);
1080         }
1081 }
1082
1083 static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1084 {
1085         struct udf_sb_info *sbi = UDF_SB(sb);
1086         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1087         struct buffer_head *bh = NULL;
1088         struct udf_inode_info *vati;
1089         uint32_t pos;
1090         struct virtualAllocationTable20 *vat20;
1091         sector_t blocks = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
1092
1093         udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block);
1094         if (!sbi->s_vat_inode &&
1095             sbi->s_last_block != blocks - 1) {
1096                 pr_notice("Failed to read VAT inode from the last recorded block (%lu), retrying with the last block of the device (%lu).\n",
1097                           (unsigned long)sbi->s_last_block,
1098                           (unsigned long)blocks - 1);
1099                 udf_find_vat_block(sb, p_index, type1_index, blocks - 1);
1100         }
1101         if (!sbi->s_vat_inode)
1102                 return 1;
1103
1104         if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1105                 map->s_type_specific.s_virtual.s_start_offset = 0;
1106                 map->s_type_specific.s_virtual.s_num_entries =
1107                         (sbi->s_vat_inode->i_size - 36) >> 2;
1108         } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1109                 vati = UDF_I(sbi->s_vat_inode);
1110                 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1111                         pos = udf_block_map(sbi->s_vat_inode, 0);
1112                         bh = sb_bread(sb, pos);
1113                         if (!bh)
1114                                 return 1;
1115                         vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1116                 } else {
1117                         vat20 = (struct virtualAllocationTable20 *)
1118                                                         vati->i_ext.i_data;
1119                 }
1120
1121                 map->s_type_specific.s_virtual.s_start_offset =
1122                         le16_to_cpu(vat20->lengthHeader);
1123                 map->s_type_specific.s_virtual.s_num_entries =
1124                         (sbi->s_vat_inode->i_size -
1125                                 map->s_type_specific.s_virtual.
1126                                         s_start_offset) >> 2;
1127                 brelse(bh);
1128         }
1129         return 0;
1130 }
1131
1132 static int udf_load_partdesc(struct super_block *sb, sector_t block)
1133 {
1134         struct buffer_head *bh;
1135         struct partitionDesc *p;
1136         struct udf_part_map *map;
1137         struct udf_sb_info *sbi = UDF_SB(sb);
1138         int i, type1_idx;
1139         uint16_t partitionNumber;
1140         uint16_t ident;
1141         int ret = 0;
1142
1143         bh = udf_read_tagged(sb, block, block, &ident);
1144         if (!bh)
1145                 return 1;
1146         if (ident != TAG_IDENT_PD)
1147                 goto out_bh;
1148
1149         p = (struct partitionDesc *)bh->b_data;
1150         partitionNumber = le16_to_cpu(p->partitionNumber);
1151
1152         /* First scan for TYPE1, SPARABLE and METADATA partitions */
1153         for (i = 0; i < sbi->s_partitions; i++) {
1154                 map = &sbi->s_partmaps[i];
1155                 udf_debug("Searching map: (%d == %d)\n",
1156                           map->s_partition_num, partitionNumber);
1157                 if (map->s_partition_num == partitionNumber &&
1158                     (map->s_partition_type == UDF_TYPE1_MAP15 ||
1159                      map->s_partition_type == UDF_SPARABLE_MAP15))
1160                         break;
1161         }
1162
1163         if (i >= sbi->s_partitions) {
1164                 udf_debug("Partition (%d) not found in partition map\n",
1165                           partitionNumber);
1166                 goto out_bh;
1167         }
1168
1169         ret = udf_fill_partdesc_info(sb, p, i);
1170
1171         /*
1172          * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1173          * PHYSICAL partitions are already set up
1174          */
1175         type1_idx = i;
1176         for (i = 0; i < sbi->s_partitions; i++) {
1177                 map = &sbi->s_partmaps[i];
1178
1179                 if (map->s_partition_num == partitionNumber &&
1180                     (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1181                      map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1182                      map->s_partition_type == UDF_METADATA_MAP25))
1183                         break;
1184         }
1185
1186         if (i >= sbi->s_partitions)
1187                 goto out_bh;
1188
1189         ret = udf_fill_partdesc_info(sb, p, i);
1190         if (ret)
1191                 goto out_bh;
1192
1193         if (map->s_partition_type == UDF_METADATA_MAP25) {
1194                 ret = udf_load_metadata_files(sb, i);
1195                 if (ret) {
1196                         udf_err(sb, "error loading MetaData partition map %d\n",
1197                                 i);
1198                         goto out_bh;
1199                 }
1200         } else {
1201                 ret = udf_load_vat(sb, i, type1_idx);
1202                 if (ret)
1203                         goto out_bh;
1204                 /*
1205                  * Mark filesystem read-only if we have a partition with
1206                  * virtual map since we don't handle writing to it (we
1207                  * overwrite blocks instead of relocating them).
1208                  */
1209                 sb->s_flags |= MS_RDONLY;
1210                 pr_notice("Filesystem marked read-only because writing to pseudooverwrite partition is not implemented\n");
1211         }
1212 out_bh:
1213         /* In case loading failed, we handle cleanup in udf_fill_super */
1214         brelse(bh);
1215         return ret;
1216 }
1217
1218 static int udf_load_logicalvol(struct super_block *sb, sector_t block,
1219                                struct kernel_lb_addr *fileset)
1220 {
1221         struct logicalVolDesc *lvd;
1222         int i, j, offset;
1223         uint8_t type;
1224         struct udf_sb_info *sbi = UDF_SB(sb);
1225         struct genericPartitionMap *gpm;
1226         uint16_t ident;
1227         struct buffer_head *bh;
1228         int ret = 0;
1229
1230         bh = udf_read_tagged(sb, block, block, &ident);
1231         if (!bh)
1232                 return 1;
1233         BUG_ON(ident != TAG_IDENT_LVD);
1234         lvd = (struct logicalVolDesc *)bh->b_data;
1235
1236         ret = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1237         if (ret)
1238                 goto out_bh;
1239
1240         for (i = 0, offset = 0;
1241              i < sbi->s_partitions && offset < le32_to_cpu(lvd->mapTableLength);
1242              i++, offset += gpm->partitionMapLength) {
1243                 struct udf_part_map *map = &sbi->s_partmaps[i];
1244                 gpm = (struct genericPartitionMap *)
1245                                 &(lvd->partitionMaps[offset]);
1246                 type = gpm->partitionMapType;
1247                 if (type == 1) {
1248                         struct genericPartitionMap1 *gpm1 =
1249                                 (struct genericPartitionMap1 *)gpm;
1250                         map->s_partition_type = UDF_TYPE1_MAP15;
1251                         map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1252                         map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1253                         map->s_partition_func = NULL;
1254                 } else if (type == 2) {
1255                         struct udfPartitionMap2 *upm2 =
1256                                                 (struct udfPartitionMap2 *)gpm;
1257                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1258                                                 strlen(UDF_ID_VIRTUAL))) {
1259                                 u16 suf =
1260                                         le16_to_cpu(((__le16 *)upm2->partIdent.
1261                                                         identSuffix)[0]);
1262                                 if (suf < 0x0200) {
1263                                         map->s_partition_type =
1264                                                         UDF_VIRTUAL_MAP15;
1265                                         map->s_partition_func =
1266                                                         udf_get_pblock_virt15;
1267                                 } else {
1268                                         map->s_partition_type =
1269                                                         UDF_VIRTUAL_MAP20;
1270                                         map->s_partition_func =
1271                                                         udf_get_pblock_virt20;
1272                                 }
1273                         } else if (!strncmp(upm2->partIdent.ident,
1274                                                 UDF_ID_SPARABLE,
1275                                                 strlen(UDF_ID_SPARABLE))) {
1276                                 uint32_t loc;
1277                                 struct sparingTable *st;
1278                                 struct sparablePartitionMap *spm =
1279                                         (struct sparablePartitionMap *)gpm;
1280
1281                                 map->s_partition_type = UDF_SPARABLE_MAP15;
1282                                 map->s_type_specific.s_sparing.s_packet_len =
1283                                                 le16_to_cpu(spm->packetLength);
1284                                 for (j = 0; j < spm->numSparingTables; j++) {
1285                                         struct buffer_head *bh2;
1286
1287                                         loc = le32_to_cpu(
1288                                                 spm->locSparingTable[j]);
1289                                         bh2 = udf_read_tagged(sb, loc, loc,
1290                                                              &ident);
1291                                         map->s_type_specific.s_sparing.
1292                                                         s_spar_map[j] = bh2;
1293
1294                                         if (bh2 == NULL)
1295                                                 continue;
1296
1297                                         st = (struct sparingTable *)bh2->b_data;
1298                                         if (ident != 0 || strncmp(
1299                                                 st->sparingIdent.ident,
1300                                                 UDF_ID_SPARING,
1301                                                 strlen(UDF_ID_SPARING))) {
1302                                                 brelse(bh2);
1303                                                 map->s_type_specific.s_sparing.
1304                                                         s_spar_map[j] = NULL;
1305                                         }
1306                                 }
1307                                 map->s_partition_func = udf_get_pblock_spar15;
1308                         } else if (!strncmp(upm2->partIdent.ident,
1309                                                 UDF_ID_METADATA,
1310                                                 strlen(UDF_ID_METADATA))) {
1311                                 struct udf_meta_data *mdata =
1312                                         &map->s_type_specific.s_metadata;
1313                                 struct metadataPartitionMap *mdm =
1314                                                 (struct metadataPartitionMap *)
1315                                                 &(lvd->partitionMaps[offset]);
1316                                 udf_debug("Parsing Logical vol part %d type %d  id=%s\n",
1317                                           i, type, UDF_ID_METADATA);
1318
1319                                 map->s_partition_type = UDF_METADATA_MAP25;
1320                                 map->s_partition_func = udf_get_pblock_meta25;
1321
1322                                 mdata->s_meta_file_loc   =
1323                                         le32_to_cpu(mdm->metadataFileLoc);
1324                                 mdata->s_mirror_file_loc =
1325                                         le32_to_cpu(mdm->metadataMirrorFileLoc);
1326                                 mdata->s_bitmap_file_loc =
1327                                         le32_to_cpu(mdm->metadataBitmapFileLoc);
1328                                 mdata->s_alloc_unit_size =
1329                                         le32_to_cpu(mdm->allocUnitSize);
1330                                 mdata->s_align_unit_size =
1331                                         le16_to_cpu(mdm->alignUnitSize);
1332                                 if (mdm->flags & 0x01)
1333                                         mdata->s_flags |= MF_DUPLICATE_MD;
1334
1335                                 udf_debug("Metadata Ident suffix=0x%x\n",
1336                                           le16_to_cpu(*(__le16 *)
1337                                                       mdm->partIdent.identSuffix));
1338                                 udf_debug("Metadata part num=%d\n",
1339                                           le16_to_cpu(mdm->partitionNum));
1340                                 udf_debug("Metadata part alloc unit size=%d\n",
1341                                           le32_to_cpu(mdm->allocUnitSize));
1342                                 udf_debug("Metadata file loc=%d\n",
1343                                           le32_to_cpu(mdm->metadataFileLoc));
1344                                 udf_debug("Mirror file loc=%d\n",
1345                                           le32_to_cpu(mdm->metadataMirrorFileLoc));
1346                                 udf_debug("Bitmap file loc=%d\n",
1347                                           le32_to_cpu(mdm->metadataBitmapFileLoc));
1348                                 udf_debug("Flags: %d %d\n",
1349                                           mdata->s_flags, mdm->flags);
1350                         } else {
1351                                 udf_debug("Unknown ident: %s\n",
1352                                           upm2->partIdent.ident);
1353                                 continue;
1354                         }
1355                         map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1356                         map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1357                 }
1358                 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1359                           i, map->s_partition_num, type, map->s_volumeseqnum);
1360         }
1361
1362         if (fileset) {
1363                 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
1364
1365                 *fileset = lelb_to_cpu(la->extLocation);
1366                 udf_debug("FileSet found in LogicalVolDesc at block=%d, partition=%d\n",
1367                           fileset->logicalBlockNum,
1368                           fileset->partitionReferenceNum);
1369         }
1370         if (lvd->integritySeqExt.extLength)
1371                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1372
1373 out_bh:
1374         brelse(bh);
1375         return ret;
1376 }
1377
1378 /*
1379  * udf_load_logicalvolint
1380  *
1381  */
1382 static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
1383 {
1384         struct buffer_head *bh = NULL;
1385         uint16_t ident;
1386         struct udf_sb_info *sbi = UDF_SB(sb);
1387         struct logicalVolIntegrityDesc *lvid;
1388
1389         while (loc.extLength > 0 &&
1390                (bh = udf_read_tagged(sb, loc.extLocation,
1391                                      loc.extLocation, &ident)) &&
1392                ident == TAG_IDENT_LVID) {
1393                 sbi->s_lvid_bh = bh;
1394                 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1395
1396                 if (lvid->nextIntegrityExt.extLength)
1397                         udf_load_logicalvolint(sb,
1398                                 leea_to_cpu(lvid->nextIntegrityExt));
1399
1400                 if (sbi->s_lvid_bh != bh)
1401                         brelse(bh);
1402                 loc.extLength -= sb->s_blocksize;
1403                 loc.extLocation++;
1404         }
1405         if (sbi->s_lvid_bh != bh)
1406                 brelse(bh);
1407 }
1408
1409 /*
1410  * udf_process_sequence
1411  *
1412  * PURPOSE
1413  *      Process a main/reserve volume descriptor sequence.
1414  *
1415  * PRE-CONDITIONS
1416  *      sb                      Pointer to _locked_ superblock.
1417  *      block                   First block of first extent of the sequence.
1418  *      lastblock               Lastblock of first extent of the sequence.
1419  *
1420  * HISTORY
1421  *      July 1, 1997 - Andrew E. Mileski
1422  *      Written, tested, and released.
1423  */
1424 static noinline int udf_process_sequence(struct super_block *sb, long block,
1425                                 long lastblock, struct kernel_lb_addr *fileset)
1426 {
1427         struct buffer_head *bh = NULL;
1428         struct udf_vds_record vds[VDS_POS_LENGTH];
1429         struct udf_vds_record *curr;
1430         struct generic_desc *gd;
1431         struct volDescPtr *vdp;
1432         int done = 0;
1433         uint32_t vdsn;
1434         uint16_t ident;
1435         long next_s = 0, next_e = 0;
1436
1437         memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1438
1439         /*
1440          * Read the main descriptor sequence and find which descriptors
1441          * are in it.
1442          */
1443         for (; (!done && block <= lastblock); block++) {
1444
1445                 bh = udf_read_tagged(sb, block, block, &ident);
1446                 if (!bh) {
1447                         udf_err(sb,
1448                                 "Block %llu of volume descriptor sequence is corrupted or we could not read it\n",
1449                                 (unsigned long long)block);
1450                         return 1;
1451                 }
1452
1453                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1454                 gd = (struct generic_desc *)bh->b_data;
1455                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1456                 switch (ident) {
1457                 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1458                         curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1459                         if (vdsn >= curr->volDescSeqNum) {
1460                                 curr->volDescSeqNum = vdsn;
1461                                 curr->block = block;
1462                         }
1463                         break;
1464                 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1465                         curr = &vds[VDS_POS_VOL_DESC_PTR];
1466                         if (vdsn >= curr->volDescSeqNum) {
1467                                 curr->volDescSeqNum = vdsn;
1468                                 curr->block = block;
1469
1470                                 vdp = (struct volDescPtr *)bh->b_data;
1471                                 next_s = le32_to_cpu(
1472                                         vdp->nextVolDescSeqExt.extLocation);
1473                                 next_e = le32_to_cpu(
1474                                         vdp->nextVolDescSeqExt.extLength);
1475                                 next_e = next_e >> sb->s_blocksize_bits;
1476                                 next_e += next_s;
1477                         }
1478                         break;
1479                 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1480                         curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1481                         if (vdsn >= curr->volDescSeqNum) {
1482                                 curr->volDescSeqNum = vdsn;
1483                                 curr->block = block;
1484                         }
1485                         break;
1486                 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1487                         curr = &vds[VDS_POS_PARTITION_DESC];
1488                         if (!curr->block)
1489                                 curr->block = block;
1490                         break;
1491                 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1492                         curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1493                         if (vdsn >= curr->volDescSeqNum) {
1494                                 curr->volDescSeqNum = vdsn;
1495                                 curr->block = block;
1496                         }
1497                         break;
1498                 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1499                         curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1500                         if (vdsn >= curr->volDescSeqNum) {
1501                                 curr->volDescSeqNum = vdsn;
1502                                 curr->block = block;
1503                         }
1504                         break;
1505                 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1506                         vds[VDS_POS_TERMINATING_DESC].block = block;
1507                         if (next_e) {
1508                                 block = next_s;
1509                                 lastblock = next_e;
1510                                 next_s = next_e = 0;
1511                         } else
1512                                 done = 1;
1513                         break;
1514                 }
1515                 brelse(bh);
1516         }
1517         /*
1518          * Now read interesting descriptors again and process them
1519          * in a suitable order
1520          */
1521         if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1522                 udf_err(sb, "Primary Volume Descriptor not found!\n");
1523                 return 1;
1524         }
1525         if (udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block))
1526                 return 1;
1527
1528         if (vds[VDS_POS_LOGICAL_VOL_DESC].block && udf_load_logicalvol(sb,
1529             vds[VDS_POS_LOGICAL_VOL_DESC].block, fileset))
1530                 return 1;
1531
1532         if (vds[VDS_POS_PARTITION_DESC].block) {
1533                 /*
1534                  * We rescan the whole descriptor sequence to find
1535                  * partition descriptor blocks and process them.
1536                  */
1537                 for (block = vds[VDS_POS_PARTITION_DESC].block;
1538                      block < vds[VDS_POS_TERMINATING_DESC].block;
1539                      block++)
1540                         if (udf_load_partdesc(sb, block))
1541                                 return 1;
1542         }
1543
1544         return 0;
1545 }
1546
1547 static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh,
1548                              struct kernel_lb_addr *fileset)
1549 {
1550         struct anchorVolDescPtr *anchor;
1551         long main_s, main_e, reserve_s, reserve_e;
1552
1553         anchor = (struct anchorVolDescPtr *)bh->b_data;
1554
1555         /* Locate the main sequence */
1556         main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1557         main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1558         main_e = main_e >> sb->s_blocksize_bits;
1559         main_e += main_s;
1560
1561         /* Locate the reserve sequence */
1562         reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1563         reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1564         reserve_e = reserve_e >> sb->s_blocksize_bits;
1565         reserve_e += reserve_s;
1566
1567         /* Process the main & reserve sequences */
1568         /* responsible for finding the PartitionDesc(s) */
1569         if (!udf_process_sequence(sb, main_s, main_e, fileset))
1570                 return 1;
1571         return !udf_process_sequence(sb, reserve_s, reserve_e, fileset);
1572 }
1573
1574 /*
1575  * Check whether there is an anchor block in the given block and
1576  * load Volume Descriptor Sequence if so.
1577  */
1578 static int udf_check_anchor_block(struct super_block *sb, sector_t block,
1579                                   struct kernel_lb_addr *fileset)
1580 {
1581         struct buffer_head *bh;
1582         uint16_t ident;
1583         int ret;
1584
1585         if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
1586             udf_fixed_to_variable(block) >=
1587             sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits)
1588                 return 0;
1589
1590         bh = udf_read_tagged(sb, block, block, &ident);
1591         if (!bh)
1592                 return 0;
1593         if (ident != TAG_IDENT_AVDP) {
1594                 brelse(bh);
1595                 return 0;
1596         }
1597         ret = udf_load_sequence(sb, bh, fileset);
1598         brelse(bh);
1599         return ret;
1600 }
1601
1602 /* Search for an anchor volume descriptor pointer */
1603 static sector_t udf_scan_anchors(struct super_block *sb, sector_t lastblock,
1604                                  struct kernel_lb_addr *fileset)
1605 {
1606         sector_t last[6];
1607         int i;
1608         struct udf_sb_info *sbi = UDF_SB(sb);
1609         int last_count = 0;
1610
1611         /* First try user provided anchor */
1612         if (sbi->s_anchor) {
1613                 if (udf_check_anchor_block(sb, sbi->s_anchor, fileset))
1614                         return lastblock;
1615         }
1616         /*
1617          * according to spec, anchor is in either:
1618          *     block 256
1619          *     lastblock-256
1620          *     lastblock
1621          *  however, if the disc isn't closed, it could be 512.
1622          */
1623         if (udf_check_anchor_block(sb, sbi->s_session + 256, fileset))
1624                 return lastblock;
1625         /*
1626          * The trouble is which block is the last one. Drives often misreport
1627          * this so we try various possibilities.
1628          */
1629         last[last_count++] = lastblock;
1630         if (lastblock >= 1)
1631                 last[last_count++] = lastblock - 1;
1632         last[last_count++] = lastblock + 1;
1633         if (lastblock >= 2)
1634                 last[last_count++] = lastblock - 2;
1635         if (lastblock >= 150)
1636                 last[last_count++] = lastblock - 150;
1637         if (lastblock >= 152)
1638                 last[last_count++] = lastblock - 152;
1639
1640         for (i = 0; i < last_count; i++) {
1641                 if (last[i] >= sb->s_bdev->bd_inode->i_size >>
1642                                 sb->s_blocksize_bits)
1643                         continue;
1644                 if (udf_check_anchor_block(sb, last[i], fileset))
1645                         return last[i];
1646                 if (last[i] < 256)
1647                         continue;
1648                 if (udf_check_anchor_block(sb, last[i] - 256, fileset))
1649                         return last[i];
1650         }
1651
1652         /* Finally try block 512 in case media is open */
1653         if (udf_check_anchor_block(sb, sbi->s_session + 512, fileset))
1654                 return last[0];
1655         return 0;
1656 }
1657
1658 /*
1659  * Find an anchor volume descriptor and load Volume Descriptor Sequence from
1660  * area specified by it. The function expects sbi->s_lastblock to be the last
1661  * block on the media.
1662  *
1663  * Return 1 if ok, 0 if not found.
1664  *
1665  */
1666 static int udf_find_anchor(struct super_block *sb,
1667                            struct kernel_lb_addr *fileset)
1668 {
1669         sector_t lastblock;
1670         struct udf_sb_info *sbi = UDF_SB(sb);
1671
1672         lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1673         if (lastblock)
1674                 goto out;
1675
1676         /* No anchor found? Try VARCONV conversion of block numbers */
1677         UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
1678         /* Firstly, we try to not convert number of the last block */
1679         lastblock = udf_scan_anchors(sb,
1680                                 udf_variable_to_fixed(sbi->s_last_block),
1681                                 fileset);
1682         if (lastblock)
1683                 goto out;
1684
1685         /* Secondly, we try with converted number of the last block */
1686         lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1687         if (!lastblock) {
1688                 /* VARCONV didn't help. Clear it. */
1689                 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
1690                 return 0;
1691         }
1692 out:
1693         sbi->s_last_block = lastblock;
1694         return 1;
1695 }
1696
1697 /*
1698  * Check Volume Structure Descriptor, find Anchor block and load Volume
1699  * Descriptor Sequence
1700  */
1701 static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
1702                         int silent, struct kernel_lb_addr *fileset)
1703 {
1704         struct udf_sb_info *sbi = UDF_SB(sb);
1705         loff_t nsr_off;
1706
1707         if (!sb_set_blocksize(sb, uopt->blocksize)) {
1708                 if (!silent)
1709                         udf_warn(sb, "Bad block size\n");
1710                 return 0;
1711         }
1712         sbi->s_last_block = uopt->lastblock;
1713         if (!uopt->novrs) {
1714                 /* Check that it is NSR02 compliant */
1715                 nsr_off = udf_check_vsd(sb);
1716                 if (!nsr_off) {
1717                         if (!silent)
1718                                 udf_warn(sb, "No VRS found\n");
1719                         return 0;
1720                 }
1721                 if (nsr_off == -1)
1722                         udf_debug("Failed to read byte 32768. Assuming open disc. Skipping validity check\n");
1723                 if (!sbi->s_last_block)
1724                         sbi->s_last_block = udf_get_last_block(sb);
1725         } else {
1726                 udf_debug("Validity check skipped because of novrs option\n");
1727         }
1728
1729         /* Look for anchor block and load Volume Descriptor Sequence */
1730         sbi->s_anchor = uopt->anchor;
1731         if (!udf_find_anchor(sb, fileset)) {
1732                 if (!silent)
1733                         udf_warn(sb, "No anchor found\n");
1734                 return 0;
1735         }
1736         return 1;
1737 }
1738
1739 static void udf_open_lvid(struct super_block *sb)
1740 {
1741         struct udf_sb_info *sbi = UDF_SB(sb);
1742         struct buffer_head *bh = sbi->s_lvid_bh;
1743         struct logicalVolIntegrityDesc *lvid;
1744         struct logicalVolIntegrityDescImpUse *lvidiu;
1745
1746         if (!bh)
1747                 return;
1748
1749         mutex_lock(&sbi->s_alloc_mutex);
1750         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1751         lvidiu = udf_sb_lvidiu(sbi);
1752
1753         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1754         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1755         udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
1756                                 CURRENT_TIME);
1757         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN);
1758
1759         lvid->descTag.descCRC = cpu_to_le16(
1760                 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1761                         le16_to_cpu(lvid->descTag.descCRCLength)));
1762
1763         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1764         mark_buffer_dirty(bh);
1765         sbi->s_lvid_dirty = 0;
1766         mutex_unlock(&sbi->s_alloc_mutex);
1767 }
1768
1769 static void udf_close_lvid(struct super_block *sb)
1770 {
1771         struct udf_sb_info *sbi = UDF_SB(sb);
1772         struct buffer_head *bh = sbi->s_lvid_bh;
1773         struct logicalVolIntegrityDesc *lvid;
1774         struct logicalVolIntegrityDescImpUse *lvidiu;
1775
1776         if (!bh)
1777                 return;
1778
1779         mutex_lock(&sbi->s_alloc_mutex);
1780         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1781         lvidiu = udf_sb_lvidiu(sbi);
1782         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1783         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1784         udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
1785         if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1786                 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1787         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1788                 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1789         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
1790                 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
1791         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1792
1793         lvid->descTag.descCRC = cpu_to_le16(
1794                         crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1795                                 le16_to_cpu(lvid->descTag.descCRCLength)));
1796
1797         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1798         /*
1799          * We set buffer uptodate unconditionally here to avoid spurious
1800          * warnings from mark_buffer_dirty() when previous EIO has marked
1801          * the buffer as !uptodate
1802          */
1803         set_buffer_uptodate(bh);
1804         mark_buffer_dirty(bh);
1805         sbi->s_lvid_dirty = 0;
1806         mutex_unlock(&sbi->s_alloc_mutex);
1807 }
1808
1809 u64 lvid_get_unique_id(struct super_block *sb)
1810 {
1811         struct buffer_head *bh;
1812         struct udf_sb_info *sbi = UDF_SB(sb);
1813         struct logicalVolIntegrityDesc *lvid;
1814         struct logicalVolHeaderDesc *lvhd;
1815         u64 uniqueID;
1816         u64 ret;
1817
1818         bh = sbi->s_lvid_bh;
1819         if (!bh)
1820                 return 0;
1821
1822         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1823         lvhd = (struct logicalVolHeaderDesc *)lvid->logicalVolContentsUse;
1824
1825         mutex_lock(&sbi->s_alloc_mutex);
1826         ret = uniqueID = le64_to_cpu(lvhd->uniqueID);
1827         if (!(++uniqueID & 0xFFFFFFFF))
1828                 uniqueID += 16;
1829         lvhd->uniqueID = cpu_to_le64(uniqueID);
1830         mutex_unlock(&sbi->s_alloc_mutex);
1831         mark_buffer_dirty(bh);
1832
1833         return ret;
1834 }
1835
1836 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
1837 {
1838         int i;
1839         int nr_groups = bitmap->s_nr_groups;
1840         int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
1841                                                 nr_groups);
1842
1843         for (i = 0; i < nr_groups; i++)
1844                 if (bitmap->s_block_bitmap[i])
1845                         brelse(bitmap->s_block_bitmap[i]);
1846
1847         if (size <= PAGE_SIZE)
1848                 kfree(bitmap);
1849         else
1850                 vfree(bitmap);
1851 }
1852
1853 static void udf_free_partition(struct udf_part_map *map)
1854 {
1855         int i;
1856         struct udf_meta_data *mdata;
1857
1858         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1859                 iput(map->s_uspace.s_table);
1860         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1861                 iput(map->s_fspace.s_table);
1862         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1863                 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
1864         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1865                 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
1866         if (map->s_partition_type == UDF_SPARABLE_MAP15)
1867                 for (i = 0; i < 4; i++)
1868                         brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
1869         else if (map->s_partition_type == UDF_METADATA_MAP25) {
1870                 mdata = &map->s_type_specific.s_metadata;
1871                 iput(mdata->s_metadata_fe);
1872                 mdata->s_metadata_fe = NULL;
1873
1874                 iput(mdata->s_mirror_fe);
1875                 mdata->s_mirror_fe = NULL;
1876
1877                 iput(mdata->s_bitmap_fe);
1878                 mdata->s_bitmap_fe = NULL;
1879         }
1880 }
1881
1882 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1883 {
1884         int i;
1885         int ret;
1886         struct inode *inode = NULL;
1887         struct udf_options uopt;
1888         struct kernel_lb_addr rootdir, fileset;
1889         struct udf_sb_info *sbi;
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                 return -ENOMEM;
1901
1902         sb->s_fs_info = sbi;
1903
1904         mutex_init(&sbi->s_alloc_mutex);
1905
1906         if (!udf_parse_options((char *)options, &uopt, false))
1907                 goto error_out;
1908
1909         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1910             uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
1911                 udf_err(sb, "utf8 cannot be combined with iocharset\n");
1912                 goto error_out;
1913         }
1914 #ifdef CONFIG_UDF_NLS
1915         if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1916                 uopt.nls_map = load_nls_default();
1917                 if (!uopt.nls_map)
1918                         uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1919                 else
1920                         udf_debug("Using default NLS map\n");
1921         }
1922 #endif
1923         if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1924                 uopt.flags |= (1 << UDF_FLAG_UTF8);
1925
1926         fileset.logicalBlockNum = 0xFFFFFFFF;
1927         fileset.partitionReferenceNum = 0xFFFF;
1928
1929         sbi->s_flags = uopt.flags;
1930         sbi->s_uid = uopt.uid;
1931         sbi->s_gid = uopt.gid;
1932         sbi->s_umask = uopt.umask;
1933         sbi->s_fmode = uopt.fmode;
1934         sbi->s_dmode = uopt.dmode;
1935         sbi->s_nls_map = uopt.nls_map;
1936         rwlock_init(&sbi->s_cred_lock);
1937
1938         if (uopt.session == 0xFFFFFFFF)
1939                 sbi->s_session = udf_get_last_session(sb);
1940         else
1941                 sbi->s_session = uopt.session;
1942
1943         udf_debug("Multi-session=%d\n", sbi->s_session);
1944
1945         /* Fill in the rest of the superblock */
1946         sb->s_op = &udf_sb_ops;
1947         sb->s_export_op = &udf_export_ops;
1948
1949         sb->s_dirt = 0;
1950         sb->s_magic = UDF_SUPER_MAGIC;
1951         sb->s_time_gran = 1000;
1952
1953         if (uopt.flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) {
1954                 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1955         } else {
1956                 uopt.blocksize = bdev_logical_block_size(sb->s_bdev);
1957                 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1958                 if (!ret && uopt.blocksize != UDF_DEFAULT_BLOCKSIZE) {
1959                         if (!silent)
1960                                 pr_notice("Rescanning with blocksize %d\n",
1961                                           UDF_DEFAULT_BLOCKSIZE);
1962                         uopt.blocksize = UDF_DEFAULT_BLOCKSIZE;
1963                         ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1964                 }
1965         }
1966         if (!ret) {
1967                 udf_warn(sb, "No partition found (1)\n");
1968                 goto error_out;
1969         }
1970
1971         udf_debug("Lastblock=%d\n", sbi->s_last_block);
1972
1973         if (sbi->s_lvid_bh) {
1974                 struct logicalVolIntegrityDescImpUse *lvidiu =
1975                                                         udf_sb_lvidiu(sbi);
1976                 uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
1977                 uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
1978                 /* uint16_t maxUDFWriteRev =
1979                                 le16_to_cpu(lvidiu->maxUDFWriteRev); */
1980
1981                 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
1982                         udf_err(sb, "minUDFReadRev=%x (max is %x)\n",
1983                                 le16_to_cpu(lvidiu->minUDFReadRev),
1984                                 UDF_MAX_READ_VERSION);
1985                         goto error_out;
1986                 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
1987                         sb->s_flags |= MS_RDONLY;
1988
1989                 sbi->s_udfrev = minUDFWriteRev;
1990
1991                 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1992                         UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
1993                 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
1994                         UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
1995         }
1996
1997         if (!sbi->s_partitions) {
1998                 udf_warn(sb, "No partition found (2)\n");
1999                 goto error_out;
2000         }
2001
2002         if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
2003                         UDF_PART_FLAG_READ_ONLY) {
2004                 pr_notice("Partition marked readonly; forcing readonly mount\n");
2005                 sb->s_flags |= MS_RDONLY;
2006         }
2007
2008         if (udf_find_fileset(sb, &fileset, &rootdir)) {
2009                 udf_warn(sb, "No fileset found\n");
2010                 goto error_out;
2011         }
2012
2013         if (!silent) {
2014                 struct timestamp ts;
2015                 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
2016                 udf_info("Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
2017                          sbi->s_volume_ident,
2018                          le16_to_cpu(ts.year), ts.month, ts.day,
2019                          ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
2020         }
2021         if (!(sb->s_flags & MS_RDONLY))
2022                 udf_open_lvid(sb);
2023
2024         /* Assign the root inode */
2025         /* assign inodes by physical block number */
2026         /* perhaps it's not extensible enough, but for now ... */
2027         inode = udf_iget(sb, &rootdir);
2028         if (!inode) {
2029                 udf_err(sb, "Error in udf_iget, block=%d, partition=%d\n",
2030                        rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
2031                 goto error_out;
2032         }
2033
2034         /* Allocate a dentry for the root inode */
2035         sb->s_root = d_make_root(inode);
2036         if (!sb->s_root) {
2037                 udf_err(sb, "Couldn't allocate root dentry\n");
2038                 goto error_out;
2039         }
2040         sb->s_maxbytes = MAX_LFS_FILESIZE;
2041         sb->s_max_links = UDF_MAX_LINKS;
2042         return 0;
2043
2044 error_out:
2045         if (sbi->s_vat_inode)
2046                 iput(sbi->s_vat_inode);
2047         if (sbi->s_partitions)
2048                 for (i = 0; i < sbi->s_partitions; i++)
2049                         udf_free_partition(&sbi->s_partmaps[i]);
2050 #ifdef CONFIG_UDF_NLS
2051         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2052                 unload_nls(sbi->s_nls_map);
2053 #endif
2054         if (!(sb->s_flags & MS_RDONLY))
2055                 udf_close_lvid(sb);
2056         brelse(sbi->s_lvid_bh);
2057
2058         kfree(sbi->s_partmaps);
2059         kfree(sbi);
2060         sb->s_fs_info = NULL;
2061
2062         return -EINVAL;
2063 }
2064
2065 void _udf_err(struct super_block *sb, const char *function,
2066               const char *fmt, ...)
2067 {
2068         struct va_format vaf;
2069         va_list args;
2070
2071         /* mark sb error */
2072         if (!(sb->s_flags & MS_RDONLY))
2073                 sb->s_dirt = 1;
2074
2075         va_start(args, fmt);
2076
2077         vaf.fmt = fmt;
2078         vaf.va = &args;
2079
2080         pr_err("error (device %s): %s: %pV", sb->s_id, function, &vaf);
2081
2082         va_end(args);
2083 }
2084
2085 void _udf_warn(struct super_block *sb, const char *function,
2086                const char *fmt, ...)
2087 {
2088         struct va_format vaf;
2089         va_list args;
2090
2091         va_start(args, fmt);
2092
2093         vaf.fmt = fmt;
2094         vaf.va = &args;
2095
2096         pr_warn("warning (device %s): %s: %pV", sb->s_id, function, &vaf);
2097
2098         va_end(args);
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         if (sbi->s_vat_inode)
2109                 iput(sbi->s_vat_inode);
2110         if (sbi->s_partitions)
2111                 for (i = 0; i < sbi->s_partitions; i++)
2112                         udf_free_partition(&sbi->s_partmaps[i]);
2113 #ifdef CONFIG_UDF_NLS
2114         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2115                 unload_nls(sbi->s_nls_map);
2116 #endif
2117         if (!(sb->s_flags & MS_RDONLY))
2118                 udf_close_lvid(sb);
2119         brelse(sbi->s_lvid_bh);
2120         kfree(sbi->s_partmaps);
2121         kfree(sb->s_fs_info);
2122         sb->s_fs_info = NULL;
2123 }
2124
2125 static int udf_sync_fs(struct super_block *sb, int wait)
2126 {
2127         struct udf_sb_info *sbi = UDF_SB(sb);
2128
2129         mutex_lock(&sbi->s_alloc_mutex);
2130         if (sbi->s_lvid_dirty) {
2131                 /*
2132                  * Blockdevice will be synced later so we don't have to submit
2133                  * the buffer for IO
2134                  */
2135                 mark_buffer_dirty(sbi->s_lvid_bh);
2136                 sb->s_dirt = 0;
2137                 sbi->s_lvid_dirty = 0;
2138         }
2139         mutex_unlock(&sbi->s_alloc_mutex);
2140
2141         return 0;
2142 }
2143
2144 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
2145 {
2146         struct super_block *sb = dentry->d_sb;
2147         struct udf_sb_info *sbi = UDF_SB(sb);
2148         struct logicalVolIntegrityDescImpUse *lvidiu;
2149         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
2150
2151         if (sbi->s_lvid_bh != NULL)
2152                 lvidiu = udf_sb_lvidiu(sbi);
2153         else
2154                 lvidiu = NULL;
2155
2156         buf->f_type = UDF_SUPER_MAGIC;
2157         buf->f_bsize = sb->s_blocksize;
2158         buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
2159         buf->f_bfree = udf_count_free(sb);
2160         buf->f_bavail = buf->f_bfree;
2161         buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2162                                           le32_to_cpu(lvidiu->numDirs)) : 0)
2163                         + buf->f_bfree;
2164         buf->f_ffree = buf->f_bfree;
2165         buf->f_namelen = UDF_NAME_LEN - 2;
2166         buf->f_fsid.val[0] = (u32)id;
2167         buf->f_fsid.val[1] = (u32)(id >> 32);
2168
2169         return 0;
2170 }
2171
2172 static unsigned int udf_count_free_bitmap(struct super_block *sb,
2173                                           struct udf_bitmap *bitmap)
2174 {
2175         struct buffer_head *bh = NULL;
2176         unsigned int accum = 0;
2177         int index;
2178         int block = 0, newblock;
2179         struct kernel_lb_addr loc;
2180         uint32_t bytes;
2181         uint8_t *ptr;
2182         uint16_t ident;
2183         struct spaceBitmapDesc *bm;
2184
2185         loc.logicalBlockNum = bitmap->s_extPosition;
2186         loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
2187         bh = udf_read_ptagged(sb, &loc, 0, &ident);
2188
2189         if (!bh) {
2190                 udf_err(sb, "udf_count_free failed\n");
2191                 goto out;
2192         } else if (ident != TAG_IDENT_SBD) {
2193                 brelse(bh);
2194                 udf_err(sb, "udf_count_free failed\n");
2195                 goto out;
2196         }
2197
2198         bm = (struct spaceBitmapDesc *)bh->b_data;
2199         bytes = le32_to_cpu(bm->numOfBytes);
2200         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2201         ptr = (uint8_t *)bh->b_data;
2202
2203         while (bytes > 0) {
2204                 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2205                 accum += bitmap_weight((const unsigned long *)(ptr + index),
2206                                         cur_bytes * 8);
2207                 bytes -= cur_bytes;
2208                 if (bytes) {
2209                         brelse(bh);
2210                         newblock = udf_get_lb_pblock(sb, &loc, ++block);
2211                         bh = udf_tread(sb, newblock);
2212                         if (!bh) {
2213                                 udf_debug("read failed\n");
2214                                 goto out;
2215                         }
2216                         index = 0;
2217                         ptr = (uint8_t *)bh->b_data;
2218                 }
2219         }
2220         brelse(bh);
2221 out:
2222         return accum;
2223 }
2224
2225 static unsigned int udf_count_free_table(struct super_block *sb,
2226                                          struct inode *table)
2227 {
2228         unsigned int accum = 0;
2229         uint32_t elen;
2230         struct kernel_lb_addr eloc;
2231         int8_t etype;
2232         struct extent_position epos;
2233
2234         mutex_lock(&UDF_SB(sb)->s_alloc_mutex);
2235         epos.block = UDF_I(table)->i_location;
2236         epos.offset = sizeof(struct unallocSpaceEntry);
2237         epos.bh = NULL;
2238
2239         while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2240                 accum += (elen >> table->i_sb->s_blocksize_bits);
2241
2242         brelse(epos.bh);
2243         mutex_unlock(&UDF_SB(sb)->s_alloc_mutex);
2244
2245         return accum;
2246 }
2247
2248 static unsigned int udf_count_free(struct super_block *sb)
2249 {
2250         unsigned int accum = 0;
2251         struct udf_sb_info *sbi;
2252         struct udf_part_map *map;
2253
2254         sbi = UDF_SB(sb);
2255         if (sbi->s_lvid_bh) {
2256                 struct logicalVolIntegrityDesc *lvid =
2257                         (struct logicalVolIntegrityDesc *)
2258                         sbi->s_lvid_bh->b_data;
2259                 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
2260                         accum = le32_to_cpu(
2261                                         lvid->freeSpaceTable[sbi->s_partition]);
2262                         if (accum == 0xFFFFFFFF)
2263                                 accum = 0;
2264                 }
2265         }
2266
2267         if (accum)
2268                 return accum;
2269
2270         map = &sbi->s_partmaps[sbi->s_partition];
2271         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2272                 accum += udf_count_free_bitmap(sb,
2273                                                map->s_uspace.s_bitmap);
2274         }
2275         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
2276                 accum += udf_count_free_bitmap(sb,
2277                                                map->s_fspace.s_bitmap);
2278         }
2279         if (accum)
2280                 return accum;
2281
2282         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2283                 accum += udf_count_free_table(sb,
2284                                               map->s_uspace.s_table);
2285         }
2286         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
2287                 accum += udf_count_free_table(sb,
2288                                               map->s_fspace.s_table);
2289         }
2290
2291         return accum;
2292 }