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 static char error_buf[1024];
  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 vfsmount *);
  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         INIT_LIST_HEAD(&inode->i_dentry);
 144         kmem_cache_free(udf_inode_cachep, UDF_I(inode));
 145 }
 146
 147 static void udf_destroy_inode(struct inode *inode)
 148 {
 149         call_rcu(&inode->i_rcu, udf_i_callback);
 150 }
 151
 152 static void init_once(void *foo)
 153 {
 154         struct udf_inode_info *ei = (struct udf_inode_info *)foo;
 155
 156         ei->i_ext.i_data = NULL;
 157         inode_init_once(&ei->vfs_inode);
 158 }
 159
 160 static int init_inodecache(void)
 161 {
 162         udf_inode_cachep = kmem_cache_create("udf_inode_cache",
 163                                              sizeof(struct udf_inode_info),
 164                                              0, (SLAB_RECLAIM_ACCOUNT |
 165                                                  SLAB_MEM_SPREAD),
 166                                              init_once);
 167         if (!udf_inode_cachep)
 168                 return -ENOMEM;
 169         return 0;
 170 }
 171
 172 static void destroy_inodecache(void)
 173 {
 174         kmem_cache_destroy(udf_inode_cachep);
 175 }
 176
 177 /* Superblock operations */
 178 static const struct super_operations udf_sb_ops = {
 179         .alloc_inode    = udf_alloc_inode,
 180         .destroy_inode  = udf_destroy_inode,
 181         .write_inode    = udf_write_inode,
 182         .evict_inode    = udf_evict_inode,
 183         .put_super      = udf_put_super,
 184         .sync_fs        = udf_sync_fs,
 185         .statfs         = udf_statfs,
 186         .remount_fs     = udf_remount_fs,
 187         .show_options   = udf_show_options,
 188 };
 189
 190 struct udf_options {
 191         unsigned char novrs;
 192         unsigned int blocksize;
 193         unsigned int session;
 194         unsigned int lastblock;
 195         unsigned int anchor;
 196         unsigned int volume;
 197         unsigned short partition;
 198         unsigned int fileset;
 199         unsigned int rootdir;
 200         unsigned int flags;
 201         mode_t umask;
 202         gid_t gid;
 203         uid_t uid;
 204         mode_t fmode;
 205         mode_t dmode;
 206         struct nls_table *nls_map;
 207 };
 208
 209 static int __init init_udf_fs(void)
 210 {
 211         int err;
 212
 213         err = init_inodecache();
 214         if (err)
 215                 goto out1;
 216         err = register_filesystem(&udf_fstype);
 217         if (err)
 218                 goto out;
 219
 220         return 0;
 221
 222 out:
 223         destroy_inodecache();
 224
 225 out1:
 226         return err;
 227 }
 228
 229 static void __exit exit_udf_fs(void)
 230 {
 231         unregister_filesystem(&udf_fstype);
 232         destroy_inodecache();
 233 }
 234
 235 module_init(init_udf_fs)
 236 module_exit(exit_udf_fs)
 237
 238 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
 239 {
 240         struct udf_sb_info *sbi = UDF_SB(sb);
 241
 242         sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map),
 243                                   GFP_KERNEL);
 244         if (!sbi->s_partmaps) {
 245                 udf_err(sb, "Unable to allocate space for %d partition maps\n",
 246                         count);
 247                 sbi->s_partitions = 0;
 248                 return -ENOMEM;
 249         }
 250
 251         sbi->s_partitions = count;
 252         return 0;
 253 }
 254
 255 static int udf_show_options(struct seq_file *seq, struct vfsmount *mnt)
 256 {
 257         struct super_block *sb = mnt->mnt_sb;
 258         struct udf_sb_info *sbi = UDF_SB(sb);
 259
 260         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
 261                 seq_puts(seq, ",nostrict");
 262         if (UDF_QUERY_FLAG(sb, UDF_FLAG_BLOCKSIZE_SET))
 263                 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
 264         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
 265                 seq_puts(seq, ",unhide");
 266         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
 267                 seq_puts(seq, ",undelete");
 268         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
 269                 seq_puts(seq, ",noadinicb");
 270         if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
 271                 seq_puts(seq, ",shortad");
 272         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
 273                 seq_puts(seq, ",uid=forget");
 274         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_IGNORE))
 275                 seq_puts(seq, ",uid=ignore");
 276         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
 277                 seq_puts(seq, ",gid=forget");
 278         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE))
 279                 seq_puts(seq, ",gid=ignore");
 280         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
 281                 seq_printf(seq, ",uid=%u", sbi->s_uid);
 282         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
 283                 seq_printf(seq, ",gid=%u", sbi->s_gid);
 284         if (sbi->s_umask != 0)
 285                 seq_printf(seq, ",umask=%o", sbi->s_umask);
 286         if (sbi->s_fmode != UDF_INVALID_MODE)
 287                 seq_printf(seq, ",mode=%o", sbi->s_fmode);
 288         if (sbi->s_dmode != UDF_INVALID_MODE)
 289                 seq_printf(seq, ",dmode=%o", sbi->s_dmode);
 290         if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
 291                 seq_printf(seq, ",session=%u", sbi->s_session);
 292         if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
 293                 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
 294         if (sbi->s_anchor != 0)
 295                 seq_printf(seq, ",anchor=%u", sbi->s_anchor);
 296         /*
 297          * volume, partition, fileset and rootdir seem to be ignored
 298          * currently
 299          */
 300         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
 301                 seq_puts(seq, ",utf8");
 302         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
 303                 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
 304
 305         return 0;
 306 }
 307
 308 /*
 309  * udf_parse_options
 310  *
 311  * PURPOSE
 312  *      Parse mount options.
 313  *
 314  * DESCRIPTION
 315  *      The following mount options are supported:
 316  *
 317  *      gid=            Set the default group.
 318  *      umask=          Set the default umask.
 319  *      mode=           Set the default file permissions.
 320  *      dmode=          Set the default directory permissions.
 321  *      uid=            Set the default user.
 322  *      bs=             Set the block size.
 323  *      unhide          Show otherwise hidden files.
 324  *      undelete        Show deleted files in lists.
 325  *      adinicb         Embed data in the inode (default)
 326  *      noadinicb       Don't embed data in the inode
 327  *      shortad         Use short ad's
 328  *      longad          Use long ad's (default)
 329  *      nostrict        Unset strict conformance
 330  *      iocharset=      Set the NLS character set
 331  *
 332  *      The remaining are for debugging and disaster recovery:
 333  *
 334  *      novrs           Skip volume sequence recognition
 335  *
 336  *      The following expect a offset from 0.
 337  *
 338  *      session=        Set the CDROM session (default= last session)
 339  *      anchor=         Override standard anchor location. (default= 256)
 340  *      volume=         Override the VolumeDesc location. (unused)
 341  *      partition=      Override the PartitionDesc location. (unused)
 342  *      lastblock=      Set the last block of the filesystem/
 343  *
 344  *      The following expect a offset from the partition root.
 345  *
 346  *      fileset=        Override the fileset block location. (unused)
 347  *      rootdir=        Override the root directory location. (unused)
 348  *              WARNING: overriding the rootdir to a non-directory may
 349  *              yield highly unpredictable results.
 350  *
 351  * PRE-CONDITIONS
 352  *      options         Pointer to mount options string.
 353  *      uopts           Pointer to mount options variable.
 354  *
 355  * POST-CONDITIONS
 356  *      <return>        1       Mount options parsed okay.
 357  *      <return>        0       Error parsing mount options.
 358  *
 359  * HISTORY
 360  *      July 1, 1997 - Andrew E. Mileski
 361  *      Written, tested, and released.
 362  */
 363
 364 enum {
 365         Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
 366         Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
 367         Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
 368         Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
 369         Opt_rootdir, Opt_utf8, Opt_iocharset,
 370         Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore,
 371         Opt_fmode, Opt_dmode
 372 };
 373
 374 static const match_table_t tokens = {
 375         {Opt_novrs,     "novrs"},
 376         {Opt_nostrict,  "nostrict"},
 377         {Opt_bs,        "bs=%u"},
 378         {Opt_unhide,    "unhide"},
 379         {Opt_undelete,  "undelete"},
 380         {Opt_noadinicb, "noadinicb"},
 381         {Opt_adinicb,   "adinicb"},
 382         {Opt_shortad,   "shortad"},
 383         {Opt_longad,    "longad"},
 384         {Opt_uforget,   "uid=forget"},
 385         {Opt_uignore,   "uid=ignore"},
 386         {Opt_gforget,   "gid=forget"},
 387         {Opt_gignore,   "gid=ignore"},
 388         {Opt_gid,       "gid=%u"},
 389         {Opt_uid,       "uid=%u"},
 390         {Opt_umask,     "umask=%o"},
 391         {Opt_session,   "session=%u"},
 392         {Opt_lastblock, "lastblock=%u"},
 393         {Opt_anchor,    "anchor=%u"},
 394         {Opt_volume,    "volume=%u"},
 395         {Opt_partition, "partition=%u"},
 396         {Opt_fileset,   "fileset=%u"},
 397         {Opt_rootdir,   "rootdir=%u"},
 398         {Opt_utf8,      "utf8"},
 399         {Opt_iocharset, "iocharset=%s"},
 400         {Opt_fmode,     "mode=%o"},
 401         {Opt_dmode,     "dmode=%o"},
 402         {Opt_err,       NULL}
 403 };
 404
 405 static int udf_parse_options(char *options, struct udf_options *uopt,
 406                              bool remount)
 407 {
 408         char *p;
 409         int option;
 410
 411         uopt->novrs = 0;
 412         uopt->partition = 0xFFFF;
 413         uopt->session = 0xFFFFFFFF;
 414         uopt->lastblock = 0;
 415         uopt->anchor = 0;
 416         uopt->volume = 0xFFFFFFFF;
 417         uopt->rootdir = 0xFFFFFFFF;
 418         uopt->fileset = 0xFFFFFFFF;
 419         uopt->nls_map = NULL;
 420
 421         if (!options)
 422                 return 1;
 423
 424         while ((p = strsep(&options, ",")) != NULL) {
 425                 substring_t args[MAX_OPT_ARGS];
 426                 int token;
 427                 if (!*p)
 428                         continue;
 429
 430                 token = match_token(p, tokens, args);
 431                 switch (token) {
 432                 case Opt_novrs:
 433                         uopt->novrs = 1;
 434                         break;
 435                 case Opt_bs:
 436                         if (match_int(&args[0], &option))
 437                                 return 0;
 438                         uopt->blocksize = option;
 439                         uopt->flags |= (1 << UDF_FLAG_BLOCKSIZE_SET);
 440                         break;
 441                 case Opt_unhide:
 442                         uopt->flags |= (1 << UDF_FLAG_UNHIDE);
 443                         break;
 444                 case Opt_undelete:
 445                         uopt->flags |= (1 << UDF_FLAG_UNDELETE);
 446                         break;
 447                 case Opt_noadinicb:
 448                         uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
 449                         break;
 450                 case Opt_adinicb:
 451                         uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
 452                         break;
 453                 case Opt_shortad:
 454                         uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
 455                         break;
 456                 case Opt_longad:
 457                         uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
 458                         break;
 459                 case Opt_gid:
 460                         if (match_int(args, &option))
 461                                 return 0;
 462                         uopt->gid = option;
 463                         uopt->flags |= (1 << UDF_FLAG_GID_SET);
 464                         break;
 465                 case Opt_uid:
 466                         if (match_int(args, &option))
 467                                 return 0;
 468                         uopt->uid = option;
 469                         uopt->flags |= (1 << UDF_FLAG_UID_SET);
 470                         break;
 471                 case Opt_umask:
 472                         if (match_octal(args, &option))
 473                                 return 0;
 474                         uopt->umask = option;
 475                         break;
 476                 case Opt_nostrict:
 477                         uopt->flags &= ~(1 << UDF_FLAG_STRICT);
 478                         break;
 479                 case Opt_session:
 480                         if (match_int(args, &option))
 481                                 return 0;
 482                         uopt->session = option;
 483                         if (!remount)
 484                                 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
 485                         break;
 486                 case Opt_lastblock:
 487                         if (match_int(args, &option))
 488                                 return 0;
 489                         uopt->lastblock = option;
 490                         if (!remount)
 491                                 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
 492                         break;
 493                 case Opt_anchor:
 494                         if (match_int(args, &option))
 495                                 return 0;
 496                         uopt->anchor = option;
 497                         break;
 498                 case Opt_volume:
 499                         if (match_int(args, &option))
 500                                 return 0;
 501                         uopt->volume = option;
 502                         break;
 503                 case Opt_partition:
 504                         if (match_int(args, &option))
 505                                 return 0;
 506                         uopt->partition = option;
 507                         break;
 508                 case Opt_fileset:
 509                         if (match_int(args, &option))
 510                                 return 0;
 511                         uopt->fileset = option;
 512                         break;
 513                 case Opt_rootdir:
 514                         if (match_int(args, &option))
 515                                 return 0;
 516                         uopt->rootdir = option;
 517                         break;
 518                 case Opt_utf8:
 519                         uopt->flags |= (1 << UDF_FLAG_UTF8);
 520                         break;
 521 #ifdef CONFIG_UDF_NLS
 522                 case Opt_iocharset:
 523                         uopt->nls_map = load_nls(args[0].from);
 524                         uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
 525                         break;
 526 #endif
 527                 case Opt_uignore:
 528                         uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
 529                         break;
 530                 case Opt_uforget:
 531                         uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
 532                         break;
 533                 case Opt_gignore:
 534                         uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
 535                         break;
 536                 case Opt_gforget:
 537                         uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
 538                         break;
 539                 case Opt_fmode:
 540                         if (match_octal(args, &option))
 541                                 return 0;
 542                         uopt->fmode = option & 0777;
 543                         break;
 544                 case Opt_dmode:
 545                         if (match_octal(args, &option))
 546                                 return 0;
 547                         uopt->dmode = option & 0777;
 548                         break;
 549                 default:
 550                         printk(KERN_ERR "udf: bad mount option \"%s\" "
 551                                "or missing value\n", p);
 552                         return 0;
 553                 }
 554         }
 555         return 1;
 556 }
 557
 558 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
 559 {
 560         struct udf_options uopt;
 561         struct udf_sb_info *sbi = UDF_SB(sb);
 562         int error = 0;
 563
 564         uopt.flags = sbi->s_flags;
 565         uopt.uid   = sbi->s_uid;
 566         uopt.gid   = sbi->s_gid;
 567         uopt.umask = sbi->s_umask;
 568         uopt.fmode = sbi->s_fmode;
 569         uopt.dmode = sbi->s_dmode;
 570
 571         if (!udf_parse_options(options, &uopt, true))
 572                 return -EINVAL;
 573
 574         write_lock(&sbi->s_cred_lock);
 575         sbi->s_flags = uopt.flags;
 576         sbi->s_uid   = uopt.uid;
 577         sbi->s_gid   = uopt.gid;
 578         sbi->s_umask = uopt.umask;
 579         sbi->s_fmode = uopt.fmode;
 580         sbi->s_dmode = uopt.dmode;
 581         write_unlock(&sbi->s_cred_lock);
 582
 583         if (sbi->s_lvid_bh) {
 584                 int write_rev = le16_to_cpu(udf_sb_lvidiu(sbi)->minUDFWriteRev);
 585                 if (write_rev > UDF_MAX_WRITE_VERSION)
 586                         *flags |= MS_RDONLY;
 587         }
 588
 589         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 590                 goto out_unlock;
 591
 592         if (*flags & MS_RDONLY)
 593                 udf_close_lvid(sb);
 594         else
 595                 udf_open_lvid(sb);
 596
 597 out_unlock:
 598         return error;
 599 }
 600
 601 /* Check Volume Structure Descriptors (ECMA 167 2/9.1) */
 602 /* We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
 603 static loff_t udf_check_vsd(struct super_block *sb)
 604 {
 605         struct volStructDesc *vsd = NULL;
 606         loff_t sector = 32768;
 607         int sectorsize;
 608         struct buffer_head *bh = NULL;
 609         int nsr02 = 0;
 610         int nsr03 = 0;
 611         struct udf_sb_info *sbi;
 612
 613         sbi = UDF_SB(sb);
 614         if (sb->s_blocksize < sizeof(struct volStructDesc))
 615                 sectorsize = sizeof(struct volStructDesc);
 616         else
 617                 sectorsize = sb->s_blocksize;
 618
 619         sector += (sbi->s_session << sb->s_blocksize_bits);
 620
 621         udf_debug("Starting at sector %u (%ld byte sectors)\n",
 622                   (unsigned int)(sector >> sb->s_blocksize_bits),
 623                   sb->s_blocksize);
 624         /* Process the sequence (if applicable) */
 625         for (; !nsr02 && !nsr03; sector += sectorsize) {
 626                 /* Read a block */
 627                 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
 628                 if (!bh)
 629                         break;
 630
 631                 /* Look for ISO  descriptors */
 632                 vsd = (struct volStructDesc *)(bh->b_data +
 633                                               (sector & (sb->s_blocksize - 1)));
 634
 635                 if (vsd->stdIdent[0] == 0) {
 636                         brelse(bh);
 637                         break;
 638                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
 639                                     VSD_STD_ID_LEN)) {
 640                         switch (vsd->structType) {
 641                         case 0:
 642                                 udf_debug("ISO9660 Boot Record found\n");
 643                                 break;
 644                         case 1:
 645                                 udf_debug("ISO9660 Primary Volume Descriptor "
 646                                           "found\n");
 647                                 break;
 648                         case 2:
 649                                 udf_debug("ISO9660 Supplementary Volume "
 650                                           "Descriptor found\n");
 651                                 break;
 652                         case 3:
 653                                 udf_debug("ISO9660 Volume Partition Descriptor "
 654                                           "found\n");
 655                                 break;
 656                         case 255:
 657                                 udf_debug("ISO9660 Volume Descriptor Set "
 658                                           "Terminator found\n");
 659                                 break;
 660                         default:
 661                                 udf_debug("ISO9660 VRS (%u) found\n",
 662                                           vsd->structType);
 663                                 break;
 664                         }
 665                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
 666                                     VSD_STD_ID_LEN))
 667                         ; /* nothing */
 668                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
 669                                     VSD_STD_ID_LEN)) {
 670                         brelse(bh);
 671                         break;
 672                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
 673                                     VSD_STD_ID_LEN))
 674                         nsr02 = sector;
 675                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
 676                                     VSD_STD_ID_LEN))
 677                         nsr03 = sector;
 678                 brelse(bh);
 679         }
 680
 681         if (nsr03)
 682                 return nsr03;
 683         else if (nsr02)
 684                 return nsr02;
 685         else if (sector - (sbi->s_session << sb->s_blocksize_bits) == 32768)
 686                 return -1;
 687         else
 688                 return 0;
 689 }
 690
 691 static int udf_find_fileset(struct super_block *sb,
 692                             struct kernel_lb_addr *fileset,
 693                             struct kernel_lb_addr *root)
 694 {
 695         struct buffer_head *bh = NULL;
 696         long lastblock;
 697         uint16_t ident;
 698         struct udf_sb_info *sbi;
 699
 700         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
 701             fileset->partitionReferenceNum != 0xFFFF) {
 702                 bh = udf_read_ptagged(sb, fileset, 0, &ident);
 703
 704                 if (!bh) {
 705                         return 1;
 706                 } else if (ident != TAG_IDENT_FSD) {
 707                         brelse(bh);
 708                         return 1;
 709                 }
 710
 711         }
 712
 713         sbi = UDF_SB(sb);
 714         if (!bh) {
 715                 /* Search backwards through the partitions */
 716                 struct kernel_lb_addr newfileset;
 717
 718 /* --> cvg: FIXME - is it reasonable? */
 719                 return 1;
 720
 721                 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
 722                      (newfileset.partitionReferenceNum != 0xFFFF &&
 723                       fileset->logicalBlockNum == 0xFFFFFFFF &&
 724                       fileset->partitionReferenceNum == 0xFFFF);
 725                      newfileset.partitionReferenceNum--) {
 726                         lastblock = sbi->s_partmaps
 727                                         [newfileset.partitionReferenceNum]
 728                                                 .s_partition_len;
 729                         newfileset.logicalBlockNum = 0;
 730
 731                         do {
 732                                 bh = udf_read_ptagged(sb, &newfileset, 0,
 733                                                       &ident);
 734                                 if (!bh) {
 735                                         newfileset.logicalBlockNum++;
 736                                         continue;
 737                                 }
 738
 739                                 switch (ident) {
 740                                 case TAG_IDENT_SBD:
 741                                 {
 742                                         struct spaceBitmapDesc *sp;
 743                                         sp = (struct spaceBitmapDesc *)
 744                                                                 bh->b_data;
 745                                         newfileset.logicalBlockNum += 1 +
 746                                                 ((le32_to_cpu(sp->numOfBytes) +
 747                                                   sizeof(struct spaceBitmapDesc)
 748                                                   - 1) >> sb->s_blocksize_bits);
 749                                         brelse(bh);
 750                                         break;
 751                                 }
 752                                 case TAG_IDENT_FSD:
 753                                         *fileset = newfileset;
 754                                         break;
 755                                 default:
 756                                         newfileset.logicalBlockNum++;
 757                                         brelse(bh);
 758                                         bh = NULL;
 759                                         break;
 760                                 }
 761                         } while (newfileset.logicalBlockNum < lastblock &&
 762                                  fileset->logicalBlockNum == 0xFFFFFFFF &&
 763                                  fileset->partitionReferenceNum == 0xFFFF);
 764                 }
 765         }
 766
 767         if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
 768              fileset->partitionReferenceNum != 0xFFFF) && bh) {
 769                 udf_debug("Fileset at block=%d, partition=%d\n",
 770                           fileset->logicalBlockNum,
 771                           fileset->partitionReferenceNum);
 772
 773                 sbi->s_partition = fileset->partitionReferenceNum;
 774                 udf_load_fileset(sb, bh, root);
 775                 brelse(bh);
 776                 return 0;
 777         }
 778         return 1;
 779 }
 780
 781 static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
 782 {
 783         struct primaryVolDesc *pvoldesc;
 784         struct ustr *instr, *outstr;
 785         struct buffer_head *bh;
 786         uint16_t ident;
 787         int ret = 1;
 788
 789         instr = kmalloc(sizeof(struct ustr), GFP_NOFS);
 790         if (!instr)
 791                 return 1;
 792
 793         outstr = kmalloc(sizeof(struct ustr), GFP_NOFS);
 794         if (!outstr)
 795                 goto out1;
 796
 797         bh = udf_read_tagged(sb, block, block, &ident);
 798         if (!bh)
 799                 goto out2;
 800
 801         BUG_ON(ident != TAG_IDENT_PVD);
 802
 803         pvoldesc = (struct primaryVolDesc *)bh->b_data;
 804
 805         if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
 806                               pvoldesc->recordingDateAndTime)) {
 807 #ifdef UDFFS_DEBUG
 808                 struct timestamp *ts = &pvoldesc->recordingDateAndTime;
 809                 udf_debug("recording time %04u/%02u/%02u"
 810                           " %02u:%02u (%x)\n",
 811                           le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
 812                           ts->minute, le16_to_cpu(ts->typeAndTimezone));
 813 #endif
 814         }
 815
 816         if (!udf_build_ustr(instr, pvoldesc->volIdent, 32))
 817                 if (udf_CS0toUTF8(outstr, instr)) {
 818                         strncpy(UDF_SB(sb)->s_volume_ident, outstr->u_name,
 819                                 outstr->u_len > 31 ? 31 : outstr->u_len);
 820                         udf_debug("volIdent[] = '%s'\n",
 821                                         UDF_SB(sb)->s_volume_ident);
 822                 }
 823
 824         if (!udf_build_ustr(instr, pvoldesc->volSetIdent, 128))
 825                 if (udf_CS0toUTF8(outstr, instr))
 826                         udf_debug("volSetIdent[] = '%s'\n", outstr->u_name);
 827
 828         brelse(bh);
 829         ret = 0;
 830 out2:
 831         kfree(outstr);
 832 out1:
 833         kfree(instr);
 834         return ret;
 835 }
 836
 837 static int udf_load_metadata_files(struct super_block *sb, int partition)
 838 {
 839         struct udf_sb_info *sbi = UDF_SB(sb);
 840         struct udf_part_map *map;
 841         struct udf_meta_data *mdata;
 842         struct kernel_lb_addr addr;
 843         int fe_error = 0;
 844
 845         map = &sbi->s_partmaps[partition];
 846         mdata = &map->s_type_specific.s_metadata;
 847
 848         /* metadata address */
 849         addr.logicalBlockNum =  mdata->s_meta_file_loc;
 850         addr.partitionReferenceNum = map->s_partition_num;
 851
 852         udf_debug("Metadata file location: block = %d part = %d\n",
 853                           addr.logicalBlockNum, addr.partitionReferenceNum);
 854
 855         mdata->s_metadata_fe = udf_iget(sb, &addr);
 856
 857         if (mdata->s_metadata_fe == NULL) {
 858                 udf_warn(sb, "metadata inode efe not found, will try mirror inode\n");
 859                 fe_error = 1;
 860         } else if (UDF_I(mdata->s_metadata_fe)->i_alloc_type !=
 861                  ICBTAG_FLAG_AD_SHORT) {
 862                 udf_warn(sb, "metadata inode efe does not have short allocation descriptors!\n");
 863                 fe_error = 1;
 864                 iput(mdata->s_metadata_fe);
 865                 mdata->s_metadata_fe = NULL;
 866         }
 867
 868         /* mirror file entry */
 869         addr.logicalBlockNum = mdata->s_mirror_file_loc;
 870         addr.partitionReferenceNum = map->s_partition_num;
 871
 872         udf_debug("Mirror metadata file location: block = %d part = %d\n",
 873                           addr.logicalBlockNum, addr.partitionReferenceNum);
 874
 875         mdata->s_mirror_fe = udf_iget(sb, &addr);
 876
 877         if (mdata->s_mirror_fe == NULL) {
 878                 if (fe_error) {
 879                         udf_err(sb, "mirror inode efe not found and metadata inode is missing too, exiting...\n");
 880                         goto error_exit;
 881                 } else
 882                         udf_warn(sb, "mirror inode efe not found, but metadata inode is OK\n");
 883         } else if (UDF_I(mdata->s_mirror_fe)->i_alloc_type !=
 884                  ICBTAG_FLAG_AD_SHORT) {
 885                 udf_warn(sb, "mirror inode efe does not have short allocation descriptors!\n");
 886                 iput(mdata->s_mirror_fe);
 887                 mdata->s_mirror_fe = NULL;
 888                 if (fe_error)
 889                         goto error_exit;
 890         }
 891
 892         /*
 893          * bitmap file entry
 894          * Note:
 895          * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
 896         */
 897         if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
 898                 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
 899                 addr.partitionReferenceNum = map->s_partition_num;
 900
 901                 udf_debug("Bitmap file location: block = %d part = %d\n",
 902                         addr.logicalBlockNum, addr.partitionReferenceNum);
 903
 904                 mdata->s_bitmap_fe = udf_iget(sb, &addr);
 905
 906                 if (mdata->s_bitmap_fe == NULL) {
 907                         if (sb->s_flags & MS_RDONLY)
 908                                 udf_warn(sb, "bitmap inode efe not found but it's ok since the disc is mounted read-only\n");
 909                         else {
 910                                 udf_err(sb, "bitmap inode efe not found and attempted read-write mount\n");
 911                                 goto error_exit;
 912                         }
 913                 }
 914         }
 915
 916         udf_debug("udf_load_metadata_files Ok\n");
 917
 918         return 0;
 919
 920 error_exit:
 921         return 1;
 922 }
 923
 924 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
 925                              struct kernel_lb_addr *root)
 926 {
 927         struct fileSetDesc *fset;
 928
 929         fset = (struct fileSetDesc *)bh->b_data;
 930
 931         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
 932
 933         UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
 934
 935         udf_debug("Rootdir at block=%d, partition=%d\n",
 936                   root->logicalBlockNum, root->partitionReferenceNum);
 937 }
 938
 939 int udf_compute_nr_groups(struct super_block *sb, u32 partition)
 940 {
 941         struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
 942         return DIV_ROUND_UP(map->s_partition_len +
 943                             (sizeof(struct spaceBitmapDesc) << 3),
 944                             sb->s_blocksize * 8);
 945 }
 946
 947 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
 948 {
 949         struct udf_bitmap *bitmap;
 950         int nr_groups;
 951         int size;
 952
 953         nr_groups = udf_compute_nr_groups(sb, index);
 954         size = sizeof(struct udf_bitmap) +
 955                 (sizeof(struct buffer_head *) * nr_groups);
 956
 957         if (size <= PAGE_SIZE)
 958                 bitmap = kzalloc(size, GFP_KERNEL);
 959         else
 960                 bitmap = vzalloc(size); /* TODO: get rid of vzalloc */
 961
 962         if (bitmap == NULL) {
 963                 udf_err(sb, "Unable to allocate space for bitmap and %d buffer_head pointers\n",
 964                         nr_groups);
 965                 return NULL;
 966         }
 967
 968         bitmap->s_block_bitmap = (struct buffer_head **)(bitmap + 1);
 969         bitmap->s_nr_groups = nr_groups;
 970         return bitmap;
 971 }
 972
 973 static int udf_fill_partdesc_info(struct super_block *sb,
 974                 struct partitionDesc *p, int p_index)
 975 {
 976         struct udf_part_map *map;
 977         struct udf_sb_info *sbi = UDF_SB(sb);
 978         struct partitionHeaderDesc *phd;
 979
 980         map = &sbi->s_partmaps[p_index];
 981
 982         map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
 983         map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
 984
 985         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
 986                 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
 987         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
 988                 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
 989         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
 990                 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
 991         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
 992                 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
 993
 994         udf_debug("Partition (%d type %x) starts at physical %d, "
 995                   "block length %d\n", p_index,
 996                   map->s_partition_type, map->s_partition_root,
 997                   map->s_partition_len);
 998
 999         if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1000             strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
1001                 return 0;
1002
1003         phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1004         if (phd->unallocSpaceTable.extLength) {
1005                 struct kernel_lb_addr loc = {
1006                         .logicalBlockNum = le32_to_cpu(
1007                                 phd->unallocSpaceTable.extPosition),
1008                         .partitionReferenceNum = p_index,
1009                 };
1010
1011                 map->s_uspace.s_table = udf_iget(sb, &loc);
1012                 if (!map->s_uspace.s_table) {
1013                         udf_debug("cannot load unallocSpaceTable (part %d)\n",
1014                                         p_index);
1015                         return 1;
1016                 }
1017                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1018                 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
1019                                 p_index, map->s_uspace.s_table->i_ino);
1020         }
1021
1022         if (phd->unallocSpaceBitmap.extLength) {
1023                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1024                 if (!bitmap)
1025                         return 1;
1026                 map->s_uspace.s_bitmap = bitmap;
1027                 bitmap->s_extLength = le32_to_cpu(
1028                                 phd->unallocSpaceBitmap.extLength);
1029                 bitmap->s_extPosition = le32_to_cpu(
1030                                 phd->unallocSpaceBitmap.extPosition);
1031                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1032                 udf_debug("unallocSpaceBitmap (part %d) @ %d\n", p_index,
1033                                                 bitmap->s_extPosition);
1034         }
1035
1036         if (phd->partitionIntegrityTable.extLength)
1037                 udf_debug("partitionIntegrityTable (part %d)\n", p_index);
1038
1039         if (phd->freedSpaceTable.extLength) {
1040                 struct kernel_lb_addr loc = {
1041                         .logicalBlockNum = le32_to_cpu(
1042                                 phd->freedSpaceTable.extPosition),
1043                         .partitionReferenceNum = p_index,
1044                 };
1045
1046                 map->s_fspace.s_table = udf_iget(sb, &loc);
1047                 if (!map->s_fspace.s_table) {
1048                         udf_debug("cannot load freedSpaceTable (part %d)\n",
1049                                 p_index);
1050                         return 1;
1051                 }
1052
1053                 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
1054                 udf_debug("freedSpaceTable (part %d) @ %ld\n",
1055                                 p_index, map->s_fspace.s_table->i_ino);
1056         }
1057
1058         if (phd->freedSpaceBitmap.extLength) {
1059                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1060                 if (!bitmap)
1061                         return 1;
1062                 map->s_fspace.s_bitmap = bitmap;
1063                 bitmap->s_extLength = le32_to_cpu(
1064                                 phd->freedSpaceBitmap.extLength);
1065                 bitmap->s_extPosition = le32_to_cpu(
1066                                 phd->freedSpaceBitmap.extPosition);
1067                 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1068                 udf_debug("freedSpaceBitmap (part %d) @ %d\n", p_index,
1069                                         bitmap->s_extPosition);
1070         }
1071         return 0;
1072 }
1073
1074 static void udf_find_vat_block(struct super_block *sb, int p_index,
1075                                int type1_index, sector_t start_block)
1076 {
1077         struct udf_sb_info *sbi = UDF_SB(sb);
1078         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1079         sector_t vat_block;
1080         struct kernel_lb_addr ino;
1081
1082         /*
1083          * VAT file entry is in the last recorded block. Some broken disks have
1084          * it a few blocks before so try a bit harder...
1085          */
1086         ino.partitionReferenceNum = type1_index;
1087         for (vat_block = start_block;
1088              vat_block >= map->s_partition_root &&
1089              vat_block >= start_block - 3 &&
1090              !sbi->s_vat_inode; vat_block--) {
1091                 ino.logicalBlockNum = vat_block - map->s_partition_root;
1092                 sbi->s_vat_inode = udf_iget(sb, &ino);
1093         }
1094 }
1095
1096 static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1097 {
1098         struct udf_sb_info *sbi = UDF_SB(sb);
1099         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1100         struct buffer_head *bh = NULL;
1101         struct udf_inode_info *vati;
1102         uint32_t pos;
1103         struct virtualAllocationTable20 *vat20;
1104         sector_t blocks = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
1105
1106         udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block);
1107         if (!sbi->s_vat_inode &&
1108             sbi->s_last_block != blocks - 1) {
1109                 printk(KERN_NOTICE "UDF-fs: Failed to read VAT inode from the"
1110                        " last recorded block (%lu), retrying with the last "
1111                        "block of the device (%lu).\n",
1112                        (unsigned long)sbi->s_last_block,
1113                        (unsigned long)blocks - 1);
1114                 udf_find_vat_block(sb, p_index, type1_index, blocks - 1);
1115         }
1116         if (!sbi->s_vat_inode)
1117                 return 1;
1118
1119         if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1120                 map->s_type_specific.s_virtual.s_start_offset = 0;
1121                 map->s_type_specific.s_virtual.s_num_entries =
1122                         (sbi->s_vat_inode->i_size - 36) >> 2;
1123         } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1124                 vati = UDF_I(sbi->s_vat_inode);
1125                 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1126                         pos = udf_block_map(sbi->s_vat_inode, 0);
1127                         bh = sb_bread(sb, pos);
1128                         if (!bh)
1129                                 return 1;
1130                         vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1131                 } else {
1132                         vat20 = (struct virtualAllocationTable20 *)
1133                                                         vati->i_ext.i_data;
1134                 }
1135
1136                 map->s_type_specific.s_virtual.s_start_offset =
1137                         le16_to_cpu(vat20->lengthHeader);
1138                 map->s_type_specific.s_virtual.s_num_entries =
1139                         (sbi->s_vat_inode->i_size -
1140                                 map->s_type_specific.s_virtual.
1141                                         s_start_offset) >> 2;
1142                 brelse(bh);
1143         }
1144         return 0;
1145 }
1146
1147 static int udf_load_partdesc(struct super_block *sb, sector_t block)
1148 {
1149         struct buffer_head *bh;
1150         struct partitionDesc *p;
1151         struct udf_part_map *map;
1152         struct udf_sb_info *sbi = UDF_SB(sb);
1153         int i, type1_idx;
1154         uint16_t partitionNumber;
1155         uint16_t ident;
1156         int ret = 0;
1157
1158         bh = udf_read_tagged(sb, block, block, &ident);
1159         if (!bh)
1160                 return 1;
1161         if (ident != TAG_IDENT_PD)
1162                 goto out_bh;
1163
1164         p = (struct partitionDesc *)bh->b_data;
1165         partitionNumber = le16_to_cpu(p->partitionNumber);
1166
1167         /* First scan for TYPE1, SPARABLE and METADATA partitions */
1168         for (i = 0; i < sbi->s_partitions; i++) {
1169                 map = &sbi->s_partmaps[i];
1170                 udf_debug("Searching map: (%d == %d)\n",
1171                           map->s_partition_num, partitionNumber);
1172                 if (map->s_partition_num == partitionNumber &&
1173                     (map->s_partition_type == UDF_TYPE1_MAP15 ||
1174                      map->s_partition_type == UDF_SPARABLE_MAP15))
1175                         break;
1176         }
1177
1178         if (i >= sbi->s_partitions) {
1179                 udf_debug("Partition (%d) not found in partition map\n",
1180                           partitionNumber);
1181                 goto out_bh;
1182         }
1183
1184         ret = udf_fill_partdesc_info(sb, p, i);
1185
1186         /*
1187          * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1188          * PHYSICAL partitions are already set up
1189          */
1190         type1_idx = i;
1191         for (i = 0; i < sbi->s_partitions; i++) {
1192                 map = &sbi->s_partmaps[i];
1193
1194                 if (map->s_partition_num == partitionNumber &&
1195                     (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1196                      map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1197                      map->s_partition_type == UDF_METADATA_MAP25))
1198                         break;
1199         }
1200
1201         if (i >= sbi->s_partitions)
1202                 goto out_bh;
1203
1204         ret = udf_fill_partdesc_info(sb, p, i);
1205         if (ret)
1206                 goto out_bh;
1207
1208         if (map->s_partition_type == UDF_METADATA_MAP25) {
1209                 ret = udf_load_metadata_files(sb, i);
1210                 if (ret) {
1211                         printk(KERN_ERR "UDF-fs: error loading MetaData "
1212                         "partition map %d\n", i);
1213                         goto out_bh;
1214                 }
1215         } else {
1216                 ret = udf_load_vat(sb, i, type1_idx);
1217                 if (ret)
1218                         goto out_bh;
1219                 /*
1220                  * Mark filesystem read-only if we have a partition with
1221                  * virtual map since we don't handle writing to it (we
1222                  * overwrite blocks instead of relocating them).
1223                  */
1224                 sb->s_flags |= MS_RDONLY;
1225                 printk(KERN_NOTICE "UDF-fs: Filesystem marked read-only "
1226                         "because writing to pseudooverwrite partition is "
1227                         "not implemented.\n");
1228         }
1229 out_bh:
1230         /* In case loading failed, we handle cleanup in udf_fill_super */
1231         brelse(bh);
1232         return ret;
1233 }
1234
1235 static int udf_load_logicalvol(struct super_block *sb, sector_t block,
1236                                struct kernel_lb_addr *fileset)
1237 {
1238         struct logicalVolDesc *lvd;
1239         int i, j, offset;
1240         uint8_t type;
1241         struct udf_sb_info *sbi = UDF_SB(sb);
1242         struct genericPartitionMap *gpm;
1243         uint16_t ident;
1244         struct buffer_head *bh;
1245         int ret = 0;
1246
1247         bh = udf_read_tagged(sb, block, block, &ident);
1248         if (!bh)
1249                 return 1;
1250         BUG_ON(ident != TAG_IDENT_LVD);
1251         lvd = (struct logicalVolDesc *)bh->b_data;
1252
1253         i = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1254         if (i != 0) {
1255                 ret = i;
1256                 goto out_bh;
1257         }
1258
1259         for (i = 0, offset = 0;
1260              i < sbi->s_partitions && offset < le32_to_cpu(lvd->mapTableLength);
1261              i++, offset += gpm->partitionMapLength) {
1262                 struct udf_part_map *map = &sbi->s_partmaps[i];
1263                 gpm = (struct genericPartitionMap *)
1264                                 &(lvd->partitionMaps[offset]);
1265                 type = gpm->partitionMapType;
1266                 if (type == 1) {
1267                         struct genericPartitionMap1 *gpm1 =
1268                                 (struct genericPartitionMap1 *)gpm;
1269                         map->s_partition_type = UDF_TYPE1_MAP15;
1270                         map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1271                         map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1272                         map->s_partition_func = NULL;
1273                 } else if (type == 2) {
1274                         struct udfPartitionMap2 *upm2 =
1275                                                 (struct udfPartitionMap2 *)gpm;
1276                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1277                                                 strlen(UDF_ID_VIRTUAL))) {
1278                                 u16 suf =
1279                                         le16_to_cpu(((__le16 *)upm2->partIdent.
1280                                                         identSuffix)[0]);
1281                                 if (suf < 0x0200) {
1282                                         map->s_partition_type =
1283                                                         UDF_VIRTUAL_MAP15;
1284                                         map->s_partition_func =
1285                                                         udf_get_pblock_virt15;
1286                                 } else {
1287                                         map->s_partition_type =
1288                                                         UDF_VIRTUAL_MAP20;
1289                                         map->s_partition_func =
1290                                                         udf_get_pblock_virt20;
1291                                 }
1292                         } else if (!strncmp(upm2->partIdent.ident,
1293                                                 UDF_ID_SPARABLE,
1294                                                 strlen(UDF_ID_SPARABLE))) {
1295                                 uint32_t loc;
1296                                 struct sparingTable *st;
1297                                 struct sparablePartitionMap *spm =
1298                                         (struct sparablePartitionMap *)gpm;
1299
1300                                 map->s_partition_type = UDF_SPARABLE_MAP15;
1301                                 map->s_type_specific.s_sparing.s_packet_len =
1302                                                 le16_to_cpu(spm->packetLength);
1303                                 for (j = 0; j < spm->numSparingTables; j++) {
1304                                         struct buffer_head *bh2;
1305
1306                                         loc = le32_to_cpu(
1307                                                 spm->locSparingTable[j]);
1308                                         bh2 = udf_read_tagged(sb, loc, loc,
1309                                                              &ident);
1310                                         map->s_type_specific.s_sparing.
1311                                                         s_spar_map[j] = bh2;
1312
1313                                         if (bh2 == NULL)
1314                                                 continue;
1315
1316                                         st = (struct sparingTable *)bh2->b_data;
1317                                         if (ident != 0 || strncmp(
1318                                                 st->sparingIdent.ident,
1319                                                 UDF_ID_SPARING,
1320                                                 strlen(UDF_ID_SPARING))) {
1321                                                 brelse(bh2);
1322                                                 map->s_type_specific.s_sparing.
1323                                                         s_spar_map[j] = NULL;
1324                                         }
1325                                 }
1326                                 map->s_partition_func = udf_get_pblock_spar15;
1327                         } else if (!strncmp(upm2->partIdent.ident,
1328                                                 UDF_ID_METADATA,
1329                                                 strlen(UDF_ID_METADATA))) {
1330                                 struct udf_meta_data *mdata =
1331                                         &map->s_type_specific.s_metadata;
1332                                 struct metadataPartitionMap *mdm =
1333                                                 (struct metadataPartitionMap *)
1334                                                 &(lvd->partitionMaps[offset]);
1335                                 udf_debug("Parsing Logical vol part %d "
1336                                         "type %d  id=%s\n", i, type,
1337                                         UDF_ID_METADATA);
1338
1339                                 map->s_partition_type = UDF_METADATA_MAP25;
1340                                 map->s_partition_func = udf_get_pblock_meta25;
1341
1342                                 mdata->s_meta_file_loc   =
1343                                         le32_to_cpu(mdm->metadataFileLoc);
1344                                 mdata->s_mirror_file_loc =
1345                                         le32_to_cpu(mdm->metadataMirrorFileLoc);
1346                                 mdata->s_bitmap_file_loc =
1347                                         le32_to_cpu(mdm->metadataBitmapFileLoc);
1348                                 mdata->s_alloc_unit_size =
1349                                         le32_to_cpu(mdm->allocUnitSize);
1350                                 mdata->s_align_unit_size =
1351                                         le16_to_cpu(mdm->alignUnitSize);
1352                                 mdata->s_dup_md_flag     =
1353                                         mdm->flags & 0x01;
1354
1355                                 udf_debug("Metadata Ident suffix=0x%x\n",
1356                                         (le16_to_cpu(
1357                                          ((__le16 *)
1358                                               mdm->partIdent.identSuffix)[0])));
1359                                 udf_debug("Metadata part num=%d\n",
1360                                         le16_to_cpu(mdm->partitionNum));
1361                                 udf_debug("Metadata part alloc unit size=%d\n",
1362                                         le32_to_cpu(mdm->allocUnitSize));
1363                                 udf_debug("Metadata file loc=%d\n",
1364                                         le32_to_cpu(mdm->metadataFileLoc));
1365                                 udf_debug("Mirror file loc=%d\n",
1366                                        le32_to_cpu(mdm->metadataMirrorFileLoc));
1367                                 udf_debug("Bitmap file loc=%d\n",
1368                                        le32_to_cpu(mdm->metadataBitmapFileLoc));
1369                                 udf_debug("Duplicate Flag: %d %d\n",
1370                                         mdata->s_dup_md_flag, mdm->flags);
1371                         } else {
1372                                 udf_debug("Unknown ident: %s\n",
1373                                           upm2->partIdent.ident);
1374                                 continue;
1375                         }
1376                         map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1377                         map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1378                 }
1379                 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1380                           i, map->s_partition_num, type,
1381                           map->s_volumeseqnum);
1382         }
1383
1384         if (fileset) {
1385                 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
1386
1387                 *fileset = lelb_to_cpu(la->extLocation);
1388                 udf_debug("FileSet found in LogicalVolDesc at block=%d, "
1389                           "partition=%d\n", fileset->logicalBlockNum,
1390                           fileset->partitionReferenceNum);
1391         }
1392         if (lvd->integritySeqExt.extLength)
1393                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1394
1395 out_bh:
1396         brelse(bh);
1397         return ret;
1398 }
1399
1400 /*
1401  * udf_load_logicalvolint
1402  *
1403  */
1404 static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
1405 {
1406         struct buffer_head *bh = NULL;
1407         uint16_t ident;
1408         struct udf_sb_info *sbi = UDF_SB(sb);
1409         struct logicalVolIntegrityDesc *lvid;
1410
1411         while (loc.extLength > 0 &&
1412                (bh = udf_read_tagged(sb, loc.extLocation,
1413                                      loc.extLocation, &ident)) &&
1414                ident == TAG_IDENT_LVID) {
1415                 sbi->s_lvid_bh = bh;
1416                 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1417
1418                 if (lvid->nextIntegrityExt.extLength)
1419                         udf_load_logicalvolint(sb,
1420                                 leea_to_cpu(lvid->nextIntegrityExt));
1421
1422                 if (sbi->s_lvid_bh != bh)
1423                         brelse(bh);
1424                 loc.extLength -= sb->s_blocksize;
1425                 loc.extLocation++;
1426         }
1427         if (sbi->s_lvid_bh != bh)
1428                 brelse(bh);
1429 }
1430
1431 /*
1432  * udf_process_sequence
1433  *
1434  * PURPOSE
1435  *      Process a main/reserve volume descriptor sequence.
1436  *
1437  * PRE-CONDITIONS
1438  *      sb                      Pointer to _locked_ superblock.
1439  *      block                   First block of first extent of the sequence.
1440  *      lastblock               Lastblock of first extent of the sequence.
1441  *
1442  * HISTORY
1443  *      July 1, 1997 - Andrew E. Mileski
1444  *      Written, tested, and released.
1445  */
1446 static noinline int udf_process_sequence(struct super_block *sb, long block,
1447                                 long lastblock, struct kernel_lb_addr *fileset)
1448 {
1449         struct buffer_head *bh = NULL;
1450         struct udf_vds_record vds[VDS_POS_LENGTH];
1451         struct udf_vds_record *curr;
1452         struct generic_desc *gd;
1453         struct volDescPtr *vdp;
1454         int done = 0;
1455         uint32_t vdsn;
1456         uint16_t ident;
1457         long next_s = 0, next_e = 0;
1458
1459         memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1460
1461         /*
1462          * Read the main descriptor sequence and find which descriptors
1463          * are in it.
1464          */
1465         for (; (!done && block <= lastblock); block++) {
1466
1467                 bh = udf_read_tagged(sb, block, block, &ident);
1468                 if (!bh) {
1469                         printk(KERN_ERR "udf: Block %Lu of volume descriptor "
1470                                "sequence is corrupted or we could not read "
1471                                "it.\n", (unsigned long long)block);
1472                         return 1;
1473                 }
1474
1475                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1476                 gd = (struct generic_desc *)bh->b_data;
1477                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1478                 switch (ident) {
1479                 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1480                         curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1481                         if (vdsn >= curr->volDescSeqNum) {
1482                                 curr->volDescSeqNum = vdsn;
1483                                 curr->block = block;
1484                         }
1485                         break;
1486                 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1487                         curr = &vds[VDS_POS_VOL_DESC_PTR];
1488                         if (vdsn >= curr->volDescSeqNum) {
1489                                 curr->volDescSeqNum = vdsn;
1490                                 curr->block = block;
1491
1492                                 vdp = (struct volDescPtr *)bh->b_data;
1493                                 next_s = le32_to_cpu(
1494                                         vdp->nextVolDescSeqExt.extLocation);
1495                                 next_e = le32_to_cpu(
1496                                         vdp->nextVolDescSeqExt.extLength);
1497                                 next_e = next_e >> sb->s_blocksize_bits;
1498                                 next_e += next_s;
1499                         }
1500                         break;
1501                 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1502                         curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1503                         if (vdsn >= curr->volDescSeqNum) {
1504                                 curr->volDescSeqNum = vdsn;
1505                                 curr->block = block;
1506                         }
1507                         break;
1508                 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1509                         curr = &vds[VDS_POS_PARTITION_DESC];
1510                         if (!curr->block)
1511                                 curr->block = block;
1512                         break;
1513                 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1514                         curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1515                         if (vdsn >= curr->volDescSeqNum) {
1516                                 curr->volDescSeqNum = vdsn;
1517                                 curr->block = block;
1518                         }
1519                         break;
1520                 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1521                         curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1522                         if (vdsn >= curr->volDescSeqNum) {
1523                                 curr->volDescSeqNum = vdsn;
1524                                 curr->block = block;
1525                         }
1526                         break;
1527                 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1528                         vds[VDS_POS_TERMINATING_DESC].block = block;
1529                         if (next_e) {
1530                                 block = next_s;
1531                                 lastblock = next_e;
1532                                 next_s = next_e = 0;
1533                         } else
1534                                 done = 1;
1535                         break;
1536                 }
1537                 brelse(bh);
1538         }
1539         /*
1540          * Now read interesting descriptors again and process them
1541          * in a suitable order
1542          */
1543         if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1544                 printk(KERN_ERR "udf: Primary Volume Descriptor not found!\n");
1545                 return 1;
1546         }
1547         if (udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block))
1548                 return 1;
1549
1550         if (vds[VDS_POS_LOGICAL_VOL_DESC].block && udf_load_logicalvol(sb,
1551             vds[VDS_POS_LOGICAL_VOL_DESC].block, fileset))
1552                 return 1;
1553
1554         if (vds[VDS_POS_PARTITION_DESC].block) {
1555                 /*
1556                  * We rescan the whole descriptor sequence to find
1557                  * partition descriptor blocks and process them.
1558                  */
1559                 for (block = vds[VDS_POS_PARTITION_DESC].block;
1560                      block < vds[VDS_POS_TERMINATING_DESC].block;
1561                      block++)
1562                         if (udf_load_partdesc(sb, block))
1563                                 return 1;
1564         }
1565
1566         return 0;
1567 }
1568
1569 static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh,
1570                              struct kernel_lb_addr *fileset)
1571 {
1572         struct anchorVolDescPtr *anchor;
1573         long main_s, main_e, reserve_s, reserve_e;
1574
1575         anchor = (struct anchorVolDescPtr *)bh->b_data;
1576
1577         /* Locate the main sequence */
1578         main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1579         main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1580         main_e = main_e >> sb->s_blocksize_bits;
1581         main_e += main_s;
1582
1583         /* Locate the reserve sequence */
1584         reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1585         reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1586         reserve_e = reserve_e >> sb->s_blocksize_bits;
1587         reserve_e += reserve_s;
1588
1589         /* Process the main & reserve sequences */
1590         /* responsible for finding the PartitionDesc(s) */
1591         if (!udf_process_sequence(sb, main_s, main_e, fileset))
1592                 return 1;
1593         return !udf_process_sequence(sb, reserve_s, reserve_e, fileset);
1594 }
1595
1596 /*
1597  * Check whether there is an anchor block in the given block and
1598  * load Volume Descriptor Sequence if so.
1599  */
1600 static int udf_check_anchor_block(struct super_block *sb, sector_t block,
1601                                   struct kernel_lb_addr *fileset)
1602 {
1603         struct buffer_head *bh;
1604         uint16_t ident;
1605         int ret;
1606
1607         if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
1608             udf_fixed_to_variable(block) >=
1609             sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits)
1610                 return 0;
1611
1612         bh = udf_read_tagged(sb, block, block, &ident);
1613         if (!bh)
1614                 return 0;
1615         if (ident != TAG_IDENT_AVDP) {
1616                 brelse(bh);
1617                 return 0;
1618         }
1619         ret = udf_load_sequence(sb, bh, fileset);
1620         brelse(bh);
1621         return ret;
1622 }
1623
1624 /* Search for an anchor volume descriptor pointer */
1625 static sector_t udf_scan_anchors(struct super_block *sb, sector_t lastblock,
1626                                  struct kernel_lb_addr *fileset)
1627 {
1628         sector_t last[6];
1629         int i;
1630         struct udf_sb_info *sbi = UDF_SB(sb);
1631         int last_count = 0;
1632
1633         /* First try user provided anchor */
1634         if (sbi->s_anchor) {
1635                 if (udf_check_anchor_block(sb, sbi->s_anchor, fileset))
1636                         return lastblock;
1637         }
1638         /*
1639          * according to spec, anchor is in either:
1640          *     block 256
1641          *     lastblock-256
1642          *     lastblock
1643          *  however, if the disc isn't closed, it could be 512.
1644          */
1645         if (udf_check_anchor_block(sb, sbi->s_session + 256, fileset))
1646                 return lastblock;
1647         /*
1648          * The trouble is which block is the last one. Drives often misreport
1649          * this so we try various possibilities.
1650          */
1651         last[last_count++] = lastblock;
1652         if (lastblock >= 1)
1653                 last[last_count++] = lastblock - 1;
1654         last[last_count++] = lastblock + 1;
1655         if (lastblock >= 2)
1656                 last[last_count++] = lastblock - 2;
1657         if (lastblock >= 150)
1658                 last[last_count++] = lastblock - 150;
1659         if (lastblock >= 152)
1660                 last[last_count++] = lastblock - 152;
1661
1662         for (i = 0; i < last_count; i++) {
1663                 if (last[i] >= sb->s_bdev->bd_inode->i_size >>
1664                                 sb->s_blocksize_bits)
1665                         continue;
1666                 if (udf_check_anchor_block(sb, last[i], fileset))
1667                         return last[i];
1668                 if (last[i] < 256)
1669                         continue;
1670                 if (udf_check_anchor_block(sb, last[i] - 256, fileset))
1671                         return last[i];
1672         }
1673
1674         /* Finally try block 512 in case media is open */
1675         if (udf_check_anchor_block(sb, sbi->s_session + 512, fileset))
1676                 return last[0];
1677         return 0;
1678 }
1679
1680 /*
1681  * Find an anchor volume descriptor and load Volume Descriptor Sequence from
1682  * area specified by it. The function expects sbi->s_lastblock to be the last
1683  * block on the media.
1684  *
1685  * Return 1 if ok, 0 if not found.
1686  *
1687  */
1688 static int udf_find_anchor(struct super_block *sb,
1689                            struct kernel_lb_addr *fileset)
1690 {
1691         sector_t lastblock;
1692         struct udf_sb_info *sbi = UDF_SB(sb);
1693
1694         lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1695         if (lastblock)
1696                 goto out;
1697
1698         /* No anchor found? Try VARCONV conversion of block numbers */
1699         UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
1700         /* Firstly, we try to not convert number of the last block */
1701         lastblock = udf_scan_anchors(sb,
1702                                 udf_variable_to_fixed(sbi->s_last_block),
1703                                 fileset);
1704         if (lastblock)
1705                 goto out;
1706
1707         /* Secondly, we try with converted number of the last block */
1708         lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1709         if (!lastblock) {
1710                 /* VARCONV didn't help. Clear it. */
1711                 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
1712                 return 0;
1713         }
1714 out:
1715         sbi->s_last_block = lastblock;
1716         return 1;
1717 }
1718
1719 /*
1720  * Check Volume Structure Descriptor, find Anchor block and load Volume
1721  * Descriptor Sequence
1722  */
1723 static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
1724                         int silent, struct kernel_lb_addr *fileset)
1725 {
1726         struct udf_sb_info *sbi = UDF_SB(sb);
1727         loff_t nsr_off;
1728
1729         if (!sb_set_blocksize(sb, uopt->blocksize)) {
1730                 if (!silent)
1731                         printk(KERN_WARNING "UDF-fs: Bad block size\n");
1732                 return 0;
1733         }
1734         sbi->s_last_block = uopt->lastblock;
1735         if (!uopt->novrs) {
1736                 /* Check that it is NSR02 compliant */
1737                 nsr_off = udf_check_vsd(sb);
1738                 if (!nsr_off) {
1739                         if (!silent)
1740                                 printk(KERN_WARNING "UDF-fs: No VRS found\n");
1741                         return 0;
1742                 }
1743                 if (nsr_off == -1)
1744                         udf_debug("Failed to read byte 32768. Assuming open "
1745                                   "disc. Skipping validity check\n");
1746                 if (!sbi->s_last_block)
1747                         sbi->s_last_block = udf_get_last_block(sb);
1748         } else {
1749                 udf_debug("Validity check skipped because of novrs option\n");
1750         }
1751
1752         /* Look for anchor block and load Volume Descriptor Sequence */
1753         sbi->s_anchor = uopt->anchor;
1754         if (!udf_find_anchor(sb, fileset)) {
1755                 if (!silent)
1756                         printk(KERN_WARNING "UDF-fs: No anchor found\n");
1757                 return 0;
1758         }
1759         return 1;
1760 }
1761
1762 static void udf_open_lvid(struct super_block *sb)
1763 {
1764         struct udf_sb_info *sbi = UDF_SB(sb);
1765         struct buffer_head *bh = sbi->s_lvid_bh;
1766         struct logicalVolIntegrityDesc *lvid;
1767         struct logicalVolIntegrityDescImpUse *lvidiu;
1768
1769         if (!bh)
1770                 return;
1771
1772         mutex_lock(&sbi->s_alloc_mutex);
1773         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1774         lvidiu = udf_sb_lvidiu(sbi);
1775
1776         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1777         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1778         udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
1779                                 CURRENT_TIME);
1780         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN);
1781
1782         lvid->descTag.descCRC = cpu_to_le16(
1783                 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1784                         le16_to_cpu(lvid->descTag.descCRCLength)));
1785
1786         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1787         mark_buffer_dirty(bh);
1788         sbi->s_lvid_dirty = 0;
1789         mutex_unlock(&sbi->s_alloc_mutex);
1790 }
1791
1792 static void udf_close_lvid(struct super_block *sb)
1793 {
1794         struct udf_sb_info *sbi = UDF_SB(sb);
1795         struct buffer_head *bh = sbi->s_lvid_bh;
1796         struct logicalVolIntegrityDesc *lvid;
1797         struct logicalVolIntegrityDescImpUse *lvidiu;
1798
1799         if (!bh)
1800                 return;
1801
1802         mutex_lock(&sbi->s_alloc_mutex);
1803         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1804         lvidiu = udf_sb_lvidiu(sbi);
1805         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1806         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1807         udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
1808         if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1809                 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1810         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1811                 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1812         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
1813                 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
1814         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1815
1816         lvid->descTag.descCRC = cpu_to_le16(
1817                         crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1818                                 le16_to_cpu(lvid->descTag.descCRCLength)));
1819
1820         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1821         mark_buffer_dirty(bh);
1822         sbi->s_lvid_dirty = 0;
1823         mutex_unlock(&sbi->s_alloc_mutex);
1824 }
1825
1826 u64 lvid_get_unique_id(struct super_block *sb)
1827 {
1828         struct buffer_head *bh;
1829         struct udf_sb_info *sbi = UDF_SB(sb);
1830         struct logicalVolIntegrityDesc *lvid;
1831         struct logicalVolHeaderDesc *lvhd;
1832         u64 uniqueID;
1833         u64 ret;
1834
1835         bh = sbi->s_lvid_bh;
1836         if (!bh)
1837                 return 0;
1838
1839         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1840         lvhd = (struct logicalVolHeaderDesc *)lvid->logicalVolContentsUse;
1841
1842         mutex_lock(&sbi->s_alloc_mutex);
1843         ret = uniqueID = le64_to_cpu(lvhd->uniqueID);
1844         if (!(++uniqueID & 0xFFFFFFFF))
1845                 uniqueID += 16;
1846         lvhd->uniqueID = cpu_to_le64(uniqueID);
1847         mutex_unlock(&sbi->s_alloc_mutex);
1848         mark_buffer_dirty(bh);
1849
1850         return ret;
1851 }
1852
1853 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
1854 {
1855         int i;
1856         int nr_groups = bitmap->s_nr_groups;
1857         int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
1858                                                 nr_groups);
1859
1860         for (i = 0; i < nr_groups; i++)
1861                 if (bitmap->s_block_bitmap[i])
1862                         brelse(bitmap->s_block_bitmap[i]);
1863
1864         if (size <= PAGE_SIZE)
1865                 kfree(bitmap);
1866         else
1867                 vfree(bitmap);
1868 }
1869
1870 static void udf_free_partition(struct udf_part_map *map)
1871 {
1872         int i;
1873         struct udf_meta_data *mdata;
1874
1875         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1876                 iput(map->s_uspace.s_table);
1877         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1878                 iput(map->s_fspace.s_table);
1879         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1880                 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
1881         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1882                 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
1883         if (map->s_partition_type == UDF_SPARABLE_MAP15)
1884                 for (i = 0; i < 4; i++)
1885                         brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
1886         else if (map->s_partition_type == UDF_METADATA_MAP25) {
1887                 mdata = &map->s_type_specific.s_metadata;
1888                 iput(mdata->s_metadata_fe);
1889                 mdata->s_metadata_fe = NULL;
1890
1891                 iput(mdata->s_mirror_fe);
1892                 mdata->s_mirror_fe = NULL;
1893
1894                 iput(mdata->s_bitmap_fe);
1895                 mdata->s_bitmap_fe = NULL;
1896         }
1897 }
1898
1899 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1900 {
1901         int i;
1902         int ret;
1903         struct inode *inode = NULL;
1904         struct udf_options uopt;
1905         struct kernel_lb_addr rootdir, fileset;
1906         struct udf_sb_info *sbi;
1907
1908         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1909         uopt.uid = -1;
1910         uopt.gid = -1;
1911         uopt.umask = 0;
1912         uopt.fmode = UDF_INVALID_MODE;
1913         uopt.dmode = UDF_INVALID_MODE;
1914
1915         sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1916         if (!sbi)
1917                 return -ENOMEM;
1918
1919         sb->s_fs_info = sbi;
1920
1921         mutex_init(&sbi->s_alloc_mutex);
1922
1923         if (!udf_parse_options((char *)options, &uopt, false))
1924                 goto error_out;
1925
1926         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1927             uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
1928                 udf_err(sb, "utf8 cannot be combined with iocharset\n");
1929                 goto error_out;
1930         }
1931 #ifdef CONFIG_UDF_NLS
1932         if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1933                 uopt.nls_map = load_nls_default();
1934                 if (!uopt.nls_map)
1935                         uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1936                 else
1937                         udf_debug("Using default NLS map\n");
1938         }
1939 #endif
1940         if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1941                 uopt.flags |= (1 << UDF_FLAG_UTF8);
1942
1943         fileset.logicalBlockNum = 0xFFFFFFFF;
1944         fileset.partitionReferenceNum = 0xFFFF;
1945
1946         sbi->s_flags = uopt.flags;
1947         sbi->s_uid = uopt.uid;
1948         sbi->s_gid = uopt.gid;
1949         sbi->s_umask = uopt.umask;
1950         sbi->s_fmode = uopt.fmode;
1951         sbi->s_dmode = uopt.dmode;
1952         sbi->s_nls_map = uopt.nls_map;
1953         rwlock_init(&sbi->s_cred_lock);
1954
1955         if (uopt.session == 0xFFFFFFFF)
1956                 sbi->s_session = udf_get_last_session(sb);
1957         else
1958                 sbi->s_session = uopt.session;
1959
1960         udf_debug("Multi-session=%d\n", sbi->s_session);
1961
1962         /* Fill in the rest of the superblock */
1963         sb->s_op = &udf_sb_ops;
1964         sb->s_export_op = &udf_export_ops;
1965
1966         sb->s_dirt = 0;
1967         sb->s_magic = UDF_SUPER_MAGIC;
1968         sb->s_time_gran = 1000;
1969
1970         if (uopt.flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) {
1971                 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1972         } else {
1973                 uopt.blocksize = bdev_logical_block_size(sb->s_bdev);
1974                 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1975                 if (!ret && uopt.blocksize != UDF_DEFAULT_BLOCKSIZE) {
1976                         if (!silent)
1977                                 printk(KERN_NOTICE
1978                                        "UDF-fs: Rescanning with blocksize "
1979                                        "%d\n", UDF_DEFAULT_BLOCKSIZE);
1980                         uopt.blocksize = UDF_DEFAULT_BLOCKSIZE;
1981                         ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1982                 }
1983         }
1984         if (!ret) {
1985                 printk(KERN_WARNING "UDF-fs: No partition found (1)\n");
1986                 goto error_out;
1987         }
1988
1989         udf_debug("Lastblock=%d\n", sbi->s_last_block);
1990
1991         if (sbi->s_lvid_bh) {
1992                 struct logicalVolIntegrityDescImpUse *lvidiu =
1993                                                         udf_sb_lvidiu(sbi);
1994                 uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
1995                 uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
1996                 /* uint16_t maxUDFWriteRev =
1997                                 le16_to_cpu(lvidiu->maxUDFWriteRev); */
1998
1999                 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
2000                         printk(KERN_ERR "UDF-fs: minUDFReadRev=%x "
2001                                         "(max is %x)\n",
2002                                le16_to_cpu(lvidiu->minUDFReadRev),
2003                                UDF_MAX_READ_VERSION);
2004                         goto error_out;
2005                 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
2006                         sb->s_flags |= MS_RDONLY;
2007
2008                 sbi->s_udfrev = minUDFWriteRev;
2009
2010                 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
2011                         UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
2012                 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
2013                         UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
2014         }
2015
2016         if (!sbi->s_partitions) {
2017                 printk(KERN_WARNING "UDF-fs: No partition found (2)\n");
2018                 goto error_out;
2019         }
2020
2021         if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
2022                         UDF_PART_FLAG_READ_ONLY) {
2023                 printk(KERN_NOTICE "UDF-fs: Partition marked readonly; "
2024                                    "forcing readonly mount\n");
2025                 sb->s_flags |= MS_RDONLY;
2026         }
2027
2028         if (udf_find_fileset(sb, &fileset, &rootdir)) {
2029                 printk(KERN_WARNING "UDF-fs: No fileset found\n");
2030                 goto error_out;
2031         }
2032
2033         if (!silent) {
2034                 struct timestamp ts;
2035                 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
2036                 udf_info("UDF: Mounting volume '%s', "
2037                          "timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
2038                          sbi->s_volume_ident, le16_to_cpu(ts.year), ts.month, ts.day,
2039                          ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
2040         }
2041         if (!(sb->s_flags & MS_RDONLY))
2042                 udf_open_lvid(sb);
2043
2044         /* Assign the root inode */
2045         /* assign inodes by physical block number */
2046         /* perhaps it's not extensible enough, but for now ... */
2047         inode = udf_iget(sb, &rootdir);
2048         if (!inode) {
2049                 printk(KERN_ERR "UDF-fs: Error in udf_iget, block=%d, "
2050                                 "partition=%d\n",
2051                        rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
2052                 goto error_out;
2053         }
2054
2055         /* Allocate a dentry for the root inode */
2056         sb->s_root = d_alloc_root(inode);
2057         if (!sb->s_root) {
2058                 printk(KERN_ERR "UDF-fs: Couldn't allocate root dentry\n");
2059                 iput(inode);
2060                 goto error_out;
2061         }
2062         sb->s_maxbytes = MAX_LFS_FILESIZE;
2063         return 0;
2064
2065 error_out:
2066         if (sbi->s_vat_inode)
2067                 iput(sbi->s_vat_inode);
2068         if (sbi->s_partitions)
2069                 for (i = 0; i < sbi->s_partitions; i++)
2070                         udf_free_partition(&sbi->s_partmaps[i]);
2071 #ifdef CONFIG_UDF_NLS
2072         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2073                 unload_nls(sbi->s_nls_map);
2074 #endif
2075         if (!(sb->s_flags & MS_RDONLY))
2076                 udf_close_lvid(sb);
2077         brelse(sbi->s_lvid_bh);
2078
2079         kfree(sbi->s_partmaps);
2080         kfree(sbi);
2081         sb->s_fs_info = NULL;
2082
2083         return -EINVAL;
2084 }
2085
2086 void _udf_err(struct super_block *sb, const char *function,
2087               const char *fmt, ...)
2088 {
2089         va_list args;
2090
2091         if (!(sb->s_flags & MS_RDONLY)) {
2092                 /* mark sb error */
2093                 sb->s_dirt = 1;
2094         }
2095         va_start(args, fmt);
2096         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2097         va_end(args);
2098         printk(KERN_CRIT "UDF-fs error (device %s): %s: %s",
2099                sb->s_id, function, error_buf);
2100 }
2101
2102 void _udf_warn(struct super_block *sb, const char *function,
2103                const char *fmt, ...)
2104 {
2105         va_list args;
2106
2107         va_start(args, fmt);
2108         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2109         va_end(args);
2110         printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s",
2111                sb->s_id, function, error_buf);
2112 }
2113
2114 static void udf_put_super(struct super_block *sb)
2115 {
2116         int i;
2117         struct udf_sb_info *sbi;
2118
2119         sbi = UDF_SB(sb);
2120
2121         if (sbi->s_vat_inode)
2122                 iput(sbi->s_vat_inode);
2123         if (sbi->s_partitions)
2124                 for (i = 0; i < sbi->s_partitions; i++)
2125                         udf_free_partition(&sbi->s_partmaps[i]);
2126 #ifdef CONFIG_UDF_NLS
2127         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2128                 unload_nls(sbi->s_nls_map);
2129 #endif
2130         if (!(sb->s_flags & MS_RDONLY))
2131                 udf_close_lvid(sb);
2132         brelse(sbi->s_lvid_bh);
2133         kfree(sbi->s_partmaps);
2134         kfree(sb->s_fs_info);
2135         sb->s_fs_info = NULL;
2136 }
2137
2138 static int udf_sync_fs(struct super_block *sb, int wait)
2139 {
2140         struct udf_sb_info *sbi = UDF_SB(sb);
2141
2142         mutex_lock(&sbi->s_alloc_mutex);
2143         if (sbi->s_lvid_dirty) {
2144                 /*
2145                  * Blockdevice will be synced later so we don't have to submit
2146                  * the buffer for IO
2147                  */
2148                 mark_buffer_dirty(sbi->s_lvid_bh);
2149                 sb->s_dirt = 0;
2150                 sbi->s_lvid_dirty = 0;
2151         }
2152         mutex_unlock(&sbi->s_alloc_mutex);
2153
2154         return 0;
2155 }
2156
2157 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
2158 {
2159         struct super_block *sb = dentry->d_sb;
2160         struct udf_sb_info *sbi = UDF_SB(sb);
2161         struct logicalVolIntegrityDescImpUse *lvidiu;
2162         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
2163
2164         if (sbi->s_lvid_bh != NULL)
2165                 lvidiu = udf_sb_lvidiu(sbi);
2166         else
2167                 lvidiu = NULL;
2168
2169         buf->f_type = UDF_SUPER_MAGIC;
2170         buf->f_bsize = sb->s_blocksize;
2171         buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
2172         buf->f_bfree = udf_count_free(sb);
2173         buf->f_bavail = buf->f_bfree;
2174         buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2175                                           le32_to_cpu(lvidiu->numDirs)) : 0)
2176                         + buf->f_bfree;
2177         buf->f_ffree = buf->f_bfree;
2178         buf->f_namelen = UDF_NAME_LEN - 2;
2179         buf->f_fsid.val[0] = (u32)id;
2180         buf->f_fsid.val[1] = (u32)(id >> 32);
2181
2182         return 0;
2183 }
2184
2185 static unsigned int udf_count_free_bitmap(struct super_block *sb,
2186                                           struct udf_bitmap *bitmap)
2187 {
2188         struct buffer_head *bh = NULL;
2189         unsigned int accum = 0;
2190         int index;
2191         int block = 0, newblock;
2192         struct kernel_lb_addr loc;
2193         uint32_t bytes;
2194         uint8_t *ptr;
2195         uint16_t ident;
2196         struct spaceBitmapDesc *bm;
2197
2198         loc.logicalBlockNum = bitmap->s_extPosition;
2199         loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
2200         bh = udf_read_ptagged(sb, &loc, 0, &ident);
2201
2202         if (!bh) {
2203                 printk(KERN_ERR "udf: udf_count_free failed\n");
2204                 goto out;
2205         } else if (ident != TAG_IDENT_SBD) {
2206                 brelse(bh);
2207                 printk(KERN_ERR "udf: udf_count_free failed\n");
2208                 goto out;
2209         }
2210
2211         bm = (struct spaceBitmapDesc *)bh->b_data;
2212         bytes = le32_to_cpu(bm->numOfBytes);
2213         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2214         ptr = (uint8_t *)bh->b_data;
2215
2216         while (bytes > 0) {
2217                 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2218                 accum += bitmap_weight((const unsigned long *)(ptr + index),
2219                                         cur_bytes * 8);
2220                 bytes -= cur_bytes;
2221                 if (bytes) {
2222                         brelse(bh);
2223                         newblock = udf_get_lb_pblock(sb, &loc, ++block);
2224                         bh = udf_tread(sb, newblock);
2225                         if (!bh) {
2226                                 udf_debug("read failed\n");
2227                                 goto out;
2228                         }
2229                         index = 0;
2230                         ptr = (uint8_t *)bh->b_data;
2231                 }
2232         }
2233         brelse(bh);
2234 out:
2235         return accum;
2236 }
2237
2238 static unsigned int udf_count_free_table(struct super_block *sb,
2239                                          struct inode *table)
2240 {
2241         unsigned int accum = 0;
2242         uint32_t elen;
2243         struct kernel_lb_addr eloc;
2244         int8_t etype;
2245         struct extent_position epos;
2246
2247         mutex_lock(&UDF_SB(sb)->s_alloc_mutex);
2248         epos.block = UDF_I(table)->i_location;
2249         epos.offset = sizeof(struct unallocSpaceEntry);
2250         epos.bh = NULL;
2251
2252         while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2253                 accum += (elen >> table->i_sb->s_blocksize_bits);
2254
2255         brelse(epos.bh);
2256         mutex_unlock(&UDF_SB(sb)->s_alloc_mutex);
2257
2258         return accum;
2259 }
2260
2261 static unsigned int udf_count_free(struct super_block *sb)
2262 {
2263         unsigned int accum = 0;
2264         struct udf_sb_info *sbi;
2265         struct udf_part_map *map;
2266
2267         sbi = UDF_SB(sb);
2268         if (sbi->s_lvid_bh) {
2269                 struct logicalVolIntegrityDesc *lvid =
2270                         (struct logicalVolIntegrityDesc *)
2271                         sbi->s_lvid_bh->b_data;
2272                 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
2273                         accum = le32_to_cpu(
2274                                         lvid->freeSpaceTable[sbi->s_partition]);
2275                         if (accum == 0xFFFFFFFF)
2276                                 accum = 0;
2277                 }
2278         }
2279
2280         if (accum)
2281                 return accum;
2282
2283         map = &sbi->s_partmaps[sbi->s_partition];
2284         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2285                 accum += udf_count_free_bitmap(sb,
2286                                                map->s_uspace.s_bitmap);
2287         }
2288         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
2289                 accum += udf_count_free_bitmap(sb,
2290                                                map->s_fspace.s_bitmap);
2291         }
2292         if (accum)
2293                 return accum;
2294
2295         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2296                 accum += udf_count_free_table(sb,
2297                                               map->s_uspace.s_table);
2298         }
2299         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
2300                 accum += udf_count_free_table(sb,
2301                                               map->s_fspace.s_table);
2302         }
2303
2304         return accum;
2305 }