Pileus Git - ~andy/linux/blob - 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 /* These are the "meat" - everything else is stuffing */
  79 static int udf_fill_super(struct super_block *, void *, int);
  80 static void udf_put_super(struct super_block *);
  81 static int udf_sync_fs(struct super_block *, int);
  82 static int udf_remount_fs(struct super_block *, int *, char *);
  83 static void udf_load_logicalvolint(struct super_block *, struct kernel_extent_ad);
  84 static int udf_find_fileset(struct super_block *, struct kernel_lb_addr *,
  85                             struct kernel_lb_addr *);
  86 static void udf_load_fileset(struct super_block *, struct buffer_head *,
  87                              struct kernel_lb_addr *);
  88 static void udf_open_lvid(struct super_block *);
  89 static void udf_close_lvid(struct super_block *);
  90 static unsigned int udf_count_free(struct super_block *);
  91 static int udf_statfs(struct dentry *, struct kstatfs *);
  92 static int udf_show_options(struct seq_file *, struct vfsmount *);
  93
  94 struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct udf_sb_info *sbi)
  95 {
  96         struct logicalVolIntegrityDesc *lvid =
  97                 (struct logicalVolIntegrityDesc *)sbi->s_lvid_bh->b_data;
  98         __u32 number_of_partitions = le32_to_cpu(lvid->numOfPartitions);
  99         __u32 offset = number_of_partitions * 2 *
 100                                 sizeof(uint32_t)/sizeof(uint8_t);
 101         return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
 102 }
 103
 104 /* UDF filesystem type */
 105 static struct dentry *udf_mount(struct file_system_type *fs_type,
 106                       int flags, const char *dev_name, void *data)
 107 {
 108         return mount_bdev(fs_type, flags, dev_name, data, udf_fill_super);
 109 }
 110
 111 static struct file_system_type udf_fstype = {
 112         .owner          = THIS_MODULE,
 113         .name           = "udf",
 114         .mount          = udf_mount,
 115         .kill_sb        = kill_block_super,
 116         .fs_flags       = FS_REQUIRES_DEV,
 117 };
 118
 119 static struct kmem_cache *udf_inode_cachep;
 120
 121 static struct inode *udf_alloc_inode(struct super_block *sb)
 122 {
 123         struct udf_inode_info *ei;
 124         ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
 125         if (!ei)
 126                 return NULL;
 127
 128         ei->i_unique = 0;
 129         ei->i_lenExtents = 0;
 130         ei->i_next_alloc_block = 0;
 131         ei->i_next_alloc_goal = 0;
 132         ei->i_strat4096 = 0;
 133         init_rwsem(&ei->i_data_sem);
 134
 135         return &ei->vfs_inode;
 136 }
 137
 138 static void udf_i_callback(struct rcu_head *head)
 139 {
 140         struct inode *inode = container_of(head, struct inode, i_rcu);
 141         INIT_LIST_HEAD(&inode->i_dentry);
 142         kmem_cache_free(udf_inode_cachep, UDF_I(inode));
 143 }
 144
 145 static void udf_destroy_inode(struct inode *inode)
 146 {
 147         call_rcu(&inode->i_rcu, udf_i_callback);
 148 }
 149
 150 static void init_once(void *foo)
 151 {
 152         struct udf_inode_info *ei = (struct udf_inode_info *)foo;
 153
 154         ei->i_ext.i_data = NULL;
 155         inode_init_once(&ei->vfs_inode);
 156 }
 157
 158 static int init_inodecache(void)
 159 {
 160         udf_inode_cachep = kmem_cache_create("udf_inode_cache",
 161                                              sizeof(struct udf_inode_info),
 162                                              0, (SLAB_RECLAIM_ACCOUNT |
 163                                                  SLAB_MEM_SPREAD),
 164                                              init_once);
 165         if (!udf_inode_cachep)
 166                 return -ENOMEM;
 167         return 0;
 168 }
 169
 170 static void destroy_inodecache(void)
 171 {
 172         kmem_cache_destroy(udf_inode_cachep);
 173 }
 174
 175 /* Superblock operations */
 176 static const struct super_operations udf_sb_ops = {
 177         .alloc_inode    = udf_alloc_inode,
 178         .destroy_inode  = udf_destroy_inode,
 179         .write_inode    = udf_write_inode,
 180         .evict_inode    = udf_evict_inode,
 181         .put_super      = udf_put_super,
 182         .sync_fs        = udf_sync_fs,
 183         .statfs         = udf_statfs,
 184         .remount_fs     = udf_remount_fs,
 185         .show_options   = udf_show_options,
 186 };
 187
 188 struct udf_options {
 189         unsigned char novrs;
 190         unsigned int blocksize;
 191         unsigned int session;
 192         unsigned int lastblock;
 193         unsigned int anchor;
 194         unsigned int volume;
 195         unsigned short partition;
 196         unsigned int fileset;
 197         unsigned int rootdir;
 198         unsigned int flags;
 199         mode_t umask;
 200         gid_t gid;
 201         uid_t uid;
 202         mode_t fmode;
 203         mode_t dmode;
 204         struct nls_table *nls_map;
 205 };
 206
 207 static int __init init_udf_fs(void)
 208 {
 209         int err;
 210
 211         err = init_inodecache();
 212         if (err)
 213                 goto out1;
 214         err = register_filesystem(&udf_fstype);
 215         if (err)
 216                 goto out;
 217
 218         return 0;
 219
 220 out:
 221         destroy_inodecache();
 222
 223 out1:
 224         return err;
 225 }
 226
 227 static void __exit exit_udf_fs(void)
 228 {
 229         unregister_filesystem(&udf_fstype);
 230         destroy_inodecache();
 231 }
 232
 233 module_init(init_udf_fs)
 234 module_exit(exit_udf_fs)
 235
 236 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
 237 {
 238         struct udf_sb_info *sbi = UDF_SB(sb);
 239
 240         sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map),
 241                                   GFP_KERNEL);
 242         if (!sbi->s_partmaps) {
 243                 udf_err(sb, "Unable to allocate space for %d partition maps\n",
 244                         count);
 245                 sbi->s_partitions = 0;
 246                 return -ENOMEM;
 247         }
 248
 249         sbi->s_partitions = count;
 250         return 0;
 251 }
 252
 253 static int udf_show_options(struct seq_file *seq, struct vfsmount *mnt)
 254 {
 255         struct super_block *sb = mnt->mnt_sb;
 256         struct udf_sb_info *sbi = UDF_SB(sb);
 257
 258         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
 259                 seq_puts(seq, ",nostrict");
 260         if (UDF_QUERY_FLAG(sb, UDF_FLAG_BLOCKSIZE_SET))
 261                 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
 262         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
 263                 seq_puts(seq, ",unhide");
 264         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
 265                 seq_puts(seq, ",undelete");
 266         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
 267                 seq_puts(seq, ",noadinicb");
 268         if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
 269                 seq_puts(seq, ",shortad");
 270         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
 271                 seq_puts(seq, ",uid=forget");
 272         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_IGNORE))
 273                 seq_puts(seq, ",uid=ignore");
 274         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
 275                 seq_puts(seq, ",gid=forget");
 276         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE))
 277                 seq_puts(seq, ",gid=ignore");
 278         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
 279                 seq_printf(seq, ",uid=%u", sbi->s_uid);
 280         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
 281                 seq_printf(seq, ",gid=%u", sbi->s_gid);
 282         if (sbi->s_umask != 0)
 283                 seq_printf(seq, ",umask=%o", sbi->s_umask);
 284         if (sbi->s_fmode != UDF_INVALID_MODE)
 285                 seq_printf(seq, ",mode=%o", sbi->s_fmode);
 286         if (sbi->s_dmode != UDF_INVALID_MODE)
 287                 seq_printf(seq, ",dmode=%o", sbi->s_dmode);
 288         if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
 289                 seq_printf(seq, ",session=%u", sbi->s_session);
 290         if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
 291                 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
 292         if (sbi->s_anchor != 0)
 293                 seq_printf(seq, ",anchor=%u", sbi->s_anchor);
 294         /*
 295          * volume, partition, fileset and rootdir seem to be ignored
 296          * currently
 297          */
 298         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
 299                 seq_puts(seq, ",utf8");
 300         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
 301                 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
 302
 303         return 0;
 304 }
 305
 306 /*
 307  * udf_parse_options
 308  *
 309  * PURPOSE
 310  *      Parse mount options.
 311  *
 312  * DESCRIPTION
 313  *      The following mount options are supported:
 314  *
 315  *      gid=            Set the default group.
 316  *      umask=          Set the default umask.
 317  *      mode=           Set the default file permissions.
 318  *      dmode=          Set the default directory permissions.
 319  *      uid=            Set the default user.
 320  *      bs=             Set the block size.
 321  *      unhide          Show otherwise hidden files.
 322  *      undelete        Show deleted files in lists.
 323  *      adinicb         Embed data in the inode (default)
 324  *      noadinicb       Don't embed data in the inode
 325  *      shortad         Use short ad's
 326  *      longad          Use long ad's (default)
 327  *      nostrict        Unset strict conformance
 328  *      iocharset=      Set the NLS character set
 329  *
 330  *      The remaining are for debugging and disaster recovery:
 331  *
 332  *      novrs           Skip volume sequence recognition
 333  *
 334  *      The following expect a offset from 0.
 335  *
 336  *      session=        Set the CDROM session (default= last session)
 337  *      anchor=         Override standard anchor location. (default= 256)
 338  *      volume=         Override the VolumeDesc location. (unused)
 339  *      partition=      Override the PartitionDesc location. (unused)
 340  *      lastblock=      Set the last block of the filesystem/
 341  *
 342  *      The following expect a offset from the partition root.
 343  *
 344  *      fileset=        Override the fileset block location. (unused)
 345  *      rootdir=        Override the root directory location. (unused)
 346  *              WARNING: overriding the rootdir to a non-directory may
 347  *              yield highly unpredictable results.
 348  *
 349  * PRE-CONDITIONS
 350  *      options         Pointer to mount options string.
 351  *      uopts           Pointer to mount options variable.
 352  *
 353  * POST-CONDITIONS
 354  *      <return>        1       Mount options parsed okay.
 355  *      <return>        0       Error parsing mount options.
 356  *
 357  * HISTORY
 358  *      July 1, 1997 - Andrew E. Mileski
 359  *      Written, tested, and released.
 360  */
 361
 362 enum {
 363         Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
 364         Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
 365         Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
 366         Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
 367         Opt_rootdir, Opt_utf8, Opt_iocharset,
 368         Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore,
 369         Opt_fmode, Opt_dmode
 370 };
 371
 372 static const match_table_t tokens = {
 373         {Opt_novrs,     "novrs"},
 374         {Opt_nostrict,  "nostrict"},
 375         {Opt_bs,        "bs=%u"},
 376         {Opt_unhide,    "unhide"},
 377         {Opt_undelete,  "undelete"},
 378         {Opt_noadinicb, "noadinicb"},
 379         {Opt_adinicb,   "adinicb"},
 380         {Opt_shortad,   "shortad"},
 381         {Opt_longad,    "longad"},
 382         {Opt_uforget,   "uid=forget"},
 383         {Opt_uignore,   "uid=ignore"},
 384         {Opt_gforget,   "gid=forget"},
 385         {Opt_gignore,   "gid=ignore"},
 386         {Opt_gid,       "gid=%u"},
 387         {Opt_uid,       "uid=%u"},
 388         {Opt_umask,     "umask=%o"},
 389         {Opt_session,   "session=%u"},
 390         {Opt_lastblock, "lastblock=%u"},
 391         {Opt_anchor,    "anchor=%u"},
 392         {Opt_volume,    "volume=%u"},
 393         {Opt_partition, "partition=%u"},
 394         {Opt_fileset,   "fileset=%u"},
 395         {Opt_rootdir,   "rootdir=%u"},
 396         {Opt_utf8,      "utf8"},
 397         {Opt_iocharset, "iocharset=%s"},
 398         {Opt_fmode,     "mode=%o"},
 399         {Opt_dmode,     "dmode=%o"},
 400         {Opt_err,       NULL}
 401 };
 402
 403 static int udf_parse_options(char *options, struct udf_options *uopt,
 404                              bool remount)
 405 {
 406         char *p;
 407         int option;
 408
 409         uopt->novrs = 0;
 410         uopt->partition = 0xFFFF;
 411         uopt->session = 0xFFFFFFFF;
 412         uopt->lastblock = 0;
 413         uopt->anchor = 0;
 414         uopt->volume = 0xFFFFFFFF;
 415         uopt->rootdir = 0xFFFFFFFF;
 416         uopt->fileset = 0xFFFFFFFF;
 417         uopt->nls_map = NULL;
 418
 419         if (!options)
 420                 return 1;
 421
 422         while ((p = strsep(&options, ",")) != NULL) {
 423                 substring_t args[MAX_OPT_ARGS];
 424                 int token;
 425                 if (!*p)
 426                         continue;
 427
 428                 token = match_token(p, tokens, args);
 429                 switch (token) {
 430                 case Opt_novrs:
 431                         uopt->novrs = 1;
 432                         break;
 433                 case Opt_bs:
 434                         if (match_int(&args[0], &option))
 435                                 return 0;
 436                         uopt->blocksize = option;
 437                         uopt->flags |= (1 << UDF_FLAG_BLOCKSIZE_SET);
 438                         break;
 439                 case Opt_unhide:
 440                         uopt->flags |= (1 << UDF_FLAG_UNHIDE);
 441                         break;
 442                 case Opt_undelete:
 443                         uopt->flags |= (1 << UDF_FLAG_UNDELETE);
 444                         break;
 445                 case Opt_noadinicb:
 446                         uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
 447                         break;
 448                 case Opt_adinicb:
 449                         uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
 450                         break;
 451                 case Opt_shortad:
 452                         uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
 453                         break;
 454                 case Opt_longad:
 455                         uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
 456                         break;
 457                 case Opt_gid:
 458                         if (match_int(args, &option))
 459                                 return 0;
 460                         uopt->gid = option;
 461                         uopt->flags |= (1 << UDF_FLAG_GID_SET);
 462                         break;
 463                 case Opt_uid:
 464                         if (match_int(args, &option))
 465                                 return 0;
 466                         uopt->uid = option;
 467                         uopt->flags |= (1 << UDF_FLAG_UID_SET);
 468                         break;
 469                 case Opt_umask:
 470                         if (match_octal(args, &option))
 471                                 return 0;
 472                         uopt->umask = option;
 473                         break;
 474                 case Opt_nostrict:
 475                         uopt->flags &= ~(1 << UDF_FLAG_STRICT);
 476                         break;
 477                 case Opt_session:
 478                         if (match_int(args, &option))
 479                                 return 0;
 480                         uopt->session = option;
 481                         if (!remount)
 482                                 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
 483                         break;
 484                 case Opt_lastblock:
 485                         if (match_int(args, &option))
 486                                 return 0;
 487                         uopt->lastblock = option;
 488                         if (!remount)
 489                                 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
 490                         break;
 491                 case Opt_anchor:
 492                         if (match_int(args, &option))
 493                                 return 0;
 494                         uopt->anchor = option;
 495                         break;
 496                 case Opt_volume:
 497                         if (match_int(args, &option))
 498                                 return 0;
 499                         uopt->volume = option;
 500                         break;
 501                 case Opt_partition:
 502                         if (match_int(args, &option))
 503                                 return 0;
 504                         uopt->partition = option;
 505                         break;
 506                 case Opt_fileset:
 507                         if (match_int(args, &option))
 508                                 return 0;
 509                         uopt->fileset = option;
 510                         break;
 511                 case Opt_rootdir:
 512                         if (match_int(args, &option))
 513                                 return 0;
 514                         uopt->rootdir = option;
 515                         break;
 516                 case Opt_utf8:
 517                         uopt->flags |= (1 << UDF_FLAG_UTF8);
 518                         break;
 519 #ifdef CONFIG_UDF_NLS
 520                 case Opt_iocharset:
 521                         uopt->nls_map = load_nls(args[0].from);
 522                         uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
 523                         break;
 524 #endif
 525                 case Opt_uignore:
 526                         uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
 527                         break;
 528                 case Opt_uforget:
 529                         uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
 530                         break;
 531                 case Opt_gignore:
 532                         uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
 533                         break;
 534                 case Opt_gforget:
 535                         uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
 536                         break;
 537                 case Opt_fmode:
 538                         if (match_octal(args, &option))
 539                                 return 0;
 540                         uopt->fmode = option & 0777;
 541                         break;
 542                 case Opt_dmode:
 543                         if (match_octal(args, &option))
 544                                 return 0;
 545                         uopt->dmode = option & 0777;
 546                         break;
 547                 default:
 548                         pr_err("bad mount option \"%s\" or missing value\n", p);
 549                         return 0;
 550                 }
 551         }
 552         return 1;
 553 }
 554
 555 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
 556 {
 557         struct udf_options uopt;
 558         struct udf_sb_info *sbi = UDF_SB(sb);
 559         int error = 0;
 560
 561         uopt.flags = sbi->s_flags;
 562         uopt.uid   = sbi->s_uid;
 563         uopt.gid   = sbi->s_gid;
 564         uopt.umask = sbi->s_umask;
 565         uopt.fmode = sbi->s_fmode;
 566         uopt.dmode = sbi->s_dmode;
 567
 568         if (!udf_parse_options(options, &uopt, true))
 569                 return -EINVAL;
 570
 571         write_lock(&sbi->s_cred_lock);
 572         sbi->s_flags = uopt.flags;
 573         sbi->s_uid   = uopt.uid;
 574         sbi->s_gid   = uopt.gid;
 575         sbi->s_umask = uopt.umask;
 576         sbi->s_fmode = uopt.fmode;
 577         sbi->s_dmode = uopt.dmode;
 578         write_unlock(&sbi->s_cred_lock);
 579
 580         if (sbi->s_lvid_bh) {
 581                 int write_rev = le16_to_cpu(udf_sb_lvidiu(sbi)->minUDFWriteRev);
 582                 if (write_rev > UDF_MAX_WRITE_VERSION)
 583                         *flags |= MS_RDONLY;
 584         }
 585
 586         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 587                 goto out_unlock;
 588
 589         if (*flags & MS_RDONLY)
 590                 udf_close_lvid(sb);
 591         else
 592                 udf_open_lvid(sb);
 593
 594 out_unlock:
 595         return error;
 596 }
 597
 598 /* Check Volume Structure Descriptors (ECMA 167 2/9.1) */
 599 /* We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
 600 static loff_t udf_check_vsd(struct super_block *sb)
 601 {
 602         struct volStructDesc *vsd = NULL;
 603         loff_t sector = 32768;
 604         int sectorsize;
 605         struct buffer_head *bh = NULL;
 606         int nsr02 = 0;
 607         int nsr03 = 0;
 608         struct udf_sb_info *sbi;
 609
 610         sbi = UDF_SB(sb);
 611         if (sb->s_blocksize < sizeof(struct volStructDesc))
 612                 sectorsize = sizeof(struct volStructDesc);
 613         else
 614                 sectorsize = sb->s_blocksize;
 615
 616         sector += (sbi->s_session << sb->s_blocksize_bits);
 617
 618         udf_debug("Starting at sector %u (%ld byte sectors)\n",
 619                   (unsigned int)(sector >> sb->s_blocksize_bits),
 620                   sb->s_blocksize);
 621         /* Process the sequence (if applicable) */
 622         for (; !nsr02 && !nsr03; sector += sectorsize) {
 623                 /* Read a block */
 624                 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
 625                 if (!bh)
 626                         break;
 627
 628                 /* Look for ISO  descriptors */
 629                 vsd = (struct volStructDesc *)(bh->b_data +
 630                                               (sector & (sb->s_blocksize - 1)));
 631
 632                 if (vsd->stdIdent[0] == 0) {
 633                         brelse(bh);
 634                         break;
 635                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
 636                                     VSD_STD_ID_LEN)) {
 637                         switch (vsd->structType) {
 638                         case 0:
 639                                 udf_debug("ISO9660 Boot Record found\n");
 640                                 break;
 641                         case 1:
 642                                 udf_debug("ISO9660 Primary Volume Descriptor "
 643                                           "found\n");
 644                                 break;
 645                         case 2:
 646                                 udf_debug("ISO9660 Supplementary Volume "
 647                                           "Descriptor found\n");
 648                                 break;
 649                         case 3:
 650                                 udf_debug("ISO9660 Volume Partition Descriptor "
 651                                           "found\n");
 652                                 break;
 653                         case 255:
 654                                 udf_debug("ISO9660 Volume Descriptor Set "
 655                                           "Terminator found\n");
 656                                 break;
 657                         default:
 658                                 udf_debug("ISO9660 VRS (%u) found\n",
 659                                           vsd->structType);
 660                                 break;
 661                         }
 662                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
 663                                     VSD_STD_ID_LEN))
 664                         ; /* nothing */
 665                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
 666                                     VSD_STD_ID_LEN)) {
 667                         brelse(bh);
 668                         break;
 669                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
 670                                     VSD_STD_ID_LEN))
 671                         nsr02 = sector;
 672                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
 673                                     VSD_STD_ID_LEN))
 674                         nsr03 = sector;
 675                 brelse(bh);
 676         }
 677
 678         if (nsr03)
 679                 return nsr03;
 680         else if (nsr02)
 681                 return nsr02;
 682         else if (sector - (sbi->s_session << sb->s_blocksize_bits) == 32768)
 683                 return -1;
 684         else
 685                 return 0;
 686 }
 687
 688 static int udf_find_fileset(struct super_block *sb,
 689                             struct kernel_lb_addr *fileset,
 690                             struct kernel_lb_addr *root)
 691 {
 692         struct buffer_head *bh = NULL;
 693         long lastblock;
 694         uint16_t ident;
 695         struct udf_sb_info *sbi;
 696
 697         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
 698             fileset->partitionReferenceNum != 0xFFFF) {
 699                 bh = udf_read_ptagged(sb, fileset, 0, &ident);
 700
 701                 if (!bh) {
 702                         return 1;
 703                 } else if (ident != TAG_IDENT_FSD) {
 704                         brelse(bh);
 705                         return 1;
 706                 }
 707
 708         }
 709
 710         sbi = UDF_SB(sb);
 711         if (!bh) {
 712                 /* Search backwards through the partitions */
 713                 struct kernel_lb_addr newfileset;
 714
 715 /* --> cvg: FIXME - is it reasonable? */
 716                 return 1;
 717
 718                 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
 719                      (newfileset.partitionReferenceNum != 0xFFFF &&
 720                       fileset->logicalBlockNum == 0xFFFFFFFF &&
 721                       fileset->partitionReferenceNum == 0xFFFF);
 722                      newfileset.partitionReferenceNum--) {
 723                         lastblock = sbi->s_partmaps
 724                                         [newfileset.partitionReferenceNum]
 725                                                 .s_partition_len;
 726                         newfileset.logicalBlockNum = 0;
 727
 728                         do {
 729                                 bh = udf_read_ptagged(sb, &newfileset, 0,
 730                                                       &ident);
 731                                 if (!bh) {
 732                                         newfileset.logicalBlockNum++;
 733                                         continue;
 734                                 }
 735
 736                                 switch (ident) {
 737                                 case TAG_IDENT_SBD:
 738                                 {
 739                                         struct spaceBitmapDesc *sp;
 740                                         sp = (struct spaceBitmapDesc *)
 741                                                                 bh->b_data;
 742                                         newfileset.logicalBlockNum += 1 +
 743                                                 ((le32_to_cpu(sp->numOfBytes) +
 744                                                   sizeof(struct spaceBitmapDesc)
 745                                                   - 1) >> sb->s_blocksize_bits);
 746                                         brelse(bh);
 747                                         break;
 748                                 }
 749                                 case TAG_IDENT_FSD:
 750                                         *fileset = newfileset;
 751                                         break;
 752                                 default:
 753                                         newfileset.logicalBlockNum++;
 754                                         brelse(bh);
 755                                         bh = NULL;
 756                                         break;
 757                                 }
 758                         } while (newfileset.logicalBlockNum < lastblock &&
 759                                  fileset->logicalBlockNum == 0xFFFFFFFF &&
 760                                  fileset->partitionReferenceNum == 0xFFFF);
 761                 }
 762         }
 763
 764         if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
 765              fileset->partitionReferenceNum != 0xFFFF) && bh) {
 766                 udf_debug("Fileset at block=%d, partition=%d\n",
 767                           fileset->logicalBlockNum,
 768                           fileset->partitionReferenceNum);
 769
 770                 sbi->s_partition = fileset->partitionReferenceNum;
 771                 udf_load_fileset(sb, bh, root);
 772                 brelse(bh);
 773                 return 0;
 774         }
 775         return 1;
 776 }
 777
 778 static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
 779 {
 780         struct primaryVolDesc *pvoldesc;
 781         struct ustr *instr, *outstr;
 782         struct buffer_head *bh;
 783         uint16_t ident;
 784         int ret = 1;
 785
 786         instr = kmalloc(sizeof(struct ustr), GFP_NOFS);
 787         if (!instr)
 788                 return 1;
 789
 790         outstr = kmalloc(sizeof(struct ustr), GFP_NOFS);
 791         if (!outstr)
 792                 goto out1;
 793
 794         bh = udf_read_tagged(sb, block, block, &ident);
 795         if (!bh)
 796                 goto out2;
 797
 798         BUG_ON(ident != TAG_IDENT_PVD);
 799
 800         pvoldesc = (struct primaryVolDesc *)bh->b_data;
 801
 802         if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
 803                               pvoldesc->recordingDateAndTime)) {
 804 #ifdef UDFFS_DEBUG
 805                 struct timestamp *ts = &pvoldesc->recordingDateAndTime;
 806                 udf_debug("recording time %04u/%02u/%02u"
 807                           " %02u:%02u (%x)\n",
 808                           le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
 809                           ts->minute, le16_to_cpu(ts->typeAndTimezone));
 810 #endif
 811         }
 812
 813         if (!udf_build_ustr(instr, pvoldesc->volIdent, 32))
 814                 if (udf_CS0toUTF8(outstr, instr)) {
 815                         strncpy(UDF_SB(sb)->s_volume_ident, outstr->u_name,
 816                                 outstr->u_len > 31 ? 31 : outstr->u_len);
 817                         udf_debug("volIdent[] = '%s'\n",
 818                                         UDF_SB(sb)->s_volume_ident);
 819                 }
 820
 821         if (!udf_build_ustr(instr, pvoldesc->volSetIdent, 128))
 822                 if (udf_CS0toUTF8(outstr, instr))
 823                         udf_debug("volSetIdent[] = '%s'\n", outstr->u_name);
 824
 825         brelse(bh);
 826         ret = 0;
 827 out2:
 828         kfree(outstr);
 829 out1:
 830         kfree(instr);
 831         return ret;
 832 }
 833
 834 static int udf_load_metadata_files(struct super_block *sb, int partition)
 835 {
 836         struct udf_sb_info *sbi = UDF_SB(sb);
 837         struct udf_part_map *map;
 838         struct udf_meta_data *mdata;
 839         struct kernel_lb_addr addr;
 840         int fe_error = 0;
 841
 842         map = &sbi->s_partmaps[partition];
 843         mdata = &map->s_type_specific.s_metadata;
 844
 845         /* metadata address */
 846         addr.logicalBlockNum =  mdata->s_meta_file_loc;
 847         addr.partitionReferenceNum = map->s_partition_num;
 848
 849         udf_debug("Metadata file location: block = %d part = %d\n",
 850                           addr.logicalBlockNum, addr.partitionReferenceNum);
 851
 852         mdata->s_metadata_fe = udf_iget(sb, &addr);
 853
 854         if (mdata->s_metadata_fe == NULL) {
 855                 udf_warn(sb, "metadata inode efe not found, will try mirror inode\n");
 856                 fe_error = 1;
 857         } else if (UDF_I(mdata->s_metadata_fe)->i_alloc_type !=
 858                  ICBTAG_FLAG_AD_SHORT) {
 859                 udf_warn(sb, "metadata inode efe does not have short allocation descriptors!\n");
 860                 fe_error = 1;
 861                 iput(mdata->s_metadata_fe);
 862                 mdata->s_metadata_fe = NULL;
 863         }
 864
 865         /* mirror file entry */
 866         addr.logicalBlockNum = mdata->s_mirror_file_loc;
 867         addr.partitionReferenceNum = map->s_partition_num;
 868
 869         udf_debug("Mirror metadata file location: block = %d part = %d\n",
 870                           addr.logicalBlockNum, addr.partitionReferenceNum);
 871
 872         mdata->s_mirror_fe = udf_iget(sb, &addr);
 873
 874         if (mdata->s_mirror_fe == NULL) {
 875                 if (fe_error) {
 876                         udf_err(sb, "mirror inode efe not found and metadata inode is missing too, exiting...\n");
 877                         goto error_exit;
 878                 } else
 879                         udf_warn(sb, "mirror inode efe not found, but metadata inode is OK\n");
 880         } else if (UDF_I(mdata->s_mirror_fe)->i_alloc_type !=
 881                  ICBTAG_FLAG_AD_SHORT) {
 882                 udf_warn(sb, "mirror inode efe does not have short allocation descriptors!\n");
 883                 iput(mdata->s_mirror_fe);
 884                 mdata->s_mirror_fe = NULL;
 885                 if (fe_error)
 886                         goto error_exit;
 887         }
 888
 889         /*
 890          * bitmap file entry
 891          * Note:
 892          * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
 893         */
 894         if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
 895                 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
 896                 addr.partitionReferenceNum = map->s_partition_num;
 897
 898                 udf_debug("Bitmap file location: block = %d part = %d\n",
 899                         addr.logicalBlockNum, addr.partitionReferenceNum);
 900
 901                 mdata->s_bitmap_fe = udf_iget(sb, &addr);
 902
 903                 if (mdata->s_bitmap_fe == NULL) {
 904                         if (sb->s_flags & MS_RDONLY)
 905                                 udf_warn(sb, "bitmap inode efe not found but it's ok since the disc is mounted read-only\n");
 906                         else {
 907                                 udf_err(sb, "bitmap inode efe not found and attempted read-write mount\n");
 908                                 goto error_exit;
 909                         }
 910                 }
 911         }
 912
 913         udf_debug("udf_load_metadata_files Ok\n");
 914
 915         return 0;
 916
 917 error_exit:
 918         return 1;
 919 }
 920
 921 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
 922                              struct kernel_lb_addr *root)
 923 {
 924         struct fileSetDesc *fset;
 925
 926         fset = (struct fileSetDesc *)bh->b_data;
 927
 928         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
 929
 930         UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
 931
 932         udf_debug("Rootdir at block=%d, partition=%d\n",
 933                   root->logicalBlockNum, root->partitionReferenceNum);
 934 }
 935
 936 int udf_compute_nr_groups(struct super_block *sb, u32 partition)
 937 {
 938         struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
 939         return DIV_ROUND_UP(map->s_partition_len +
 940                             (sizeof(struct spaceBitmapDesc) << 3),
 941                             sb->s_blocksize * 8);
 942 }
 943
 944 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
 945 {
 946         struct udf_bitmap *bitmap;
 947         int nr_groups;
 948         int size;
 949
 950         nr_groups = udf_compute_nr_groups(sb, index);
 951         size = sizeof(struct udf_bitmap) +
 952                 (sizeof(struct buffer_head *) * nr_groups);
 953
 954         if (size <= PAGE_SIZE)
 955                 bitmap = kzalloc(size, GFP_KERNEL);
 956         else
 957                 bitmap = vzalloc(size); /* TODO: get rid of vzalloc */
 958
 959         if (bitmap == NULL) {
 960                 udf_err(sb, "Unable to allocate space for bitmap and %d buffer_head pointers\n",
 961                         nr_groups);
 962                 return NULL;
 963         }
 964
 965         bitmap->s_block_bitmap = (struct buffer_head **)(bitmap + 1);
 966         bitmap->s_nr_groups = nr_groups;
 967         return bitmap;
 968 }
 969
 970 static int udf_fill_partdesc_info(struct super_block *sb,
 971                 struct partitionDesc *p, int p_index)
 972 {
 973         struct udf_part_map *map;
 974         struct udf_sb_info *sbi = UDF_SB(sb);
 975         struct partitionHeaderDesc *phd;
 976
 977         map = &sbi->s_partmaps[p_index];
 978
 979         map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
 980         map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
 981
 982         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
 983                 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
 984         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
 985                 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
 986         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
 987                 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
 988         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
 989                 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
 990
 991         udf_debug("Partition (%d type %x) starts at physical %d, "
 992                   "block length %d\n", p_index,
 993                   map->s_partition_type, map->s_partition_root,
 994                   map->s_partition_len);
 995
 996         if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
 997             strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
 998                 return 0;
 999
1000         phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1001         if (phd->unallocSpaceTable.extLength) {
1002                 struct kernel_lb_addr loc = {
1003                         .logicalBlockNum = le32_to_cpu(
1004                                 phd->unallocSpaceTable.extPosition),
1005                         .partitionReferenceNum = p_index,
1006                 };
1007
1008                 map->s_uspace.s_table = udf_iget(sb, &loc);
1009                 if (!map->s_uspace.s_table) {
1010                         udf_debug("cannot load unallocSpaceTable (part %d)\n",
1011                                         p_index);
1012                         return 1;
1013                 }
1014                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1015                 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
1016                                 p_index, map->s_uspace.s_table->i_ino);
1017         }
1018
1019         if (phd->unallocSpaceBitmap.extLength) {
1020                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1021                 if (!bitmap)
1022                         return 1;
1023                 map->s_uspace.s_bitmap = bitmap;
1024                 bitmap->s_extLength = le32_to_cpu(
1025                                 phd->unallocSpaceBitmap.extLength);
1026                 bitmap->s_extPosition = le32_to_cpu(
1027                                 phd->unallocSpaceBitmap.extPosition);
1028                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1029                 udf_debug("unallocSpaceBitmap (part %d) @ %d\n", p_index,
1030                                                 bitmap->s_extPosition);
1031         }
1032
1033         if (phd->partitionIntegrityTable.extLength)
1034                 udf_debug("partitionIntegrityTable (part %d)\n", p_index);
1035
1036         if (phd->freedSpaceTable.extLength) {
1037                 struct kernel_lb_addr loc = {
1038                         .logicalBlockNum = le32_to_cpu(
1039                                 phd->freedSpaceTable.extPosition),
1040                         .partitionReferenceNum = p_index,
1041                 };
1042
1043                 map->s_fspace.s_table = udf_iget(sb, &loc);
1044                 if (!map->s_fspace.s_table) {
1045                         udf_debug("cannot load freedSpaceTable (part %d)\n",
1046                                 p_index);
1047                         return 1;
1048                 }
1049
1050                 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
1051                 udf_debug("freedSpaceTable (part %d) @ %ld\n",
1052                                 p_index, map->s_fspace.s_table->i_ino);
1053         }
1054
1055         if (phd->freedSpaceBitmap.extLength) {
1056                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1057                 if (!bitmap)
1058                         return 1;
1059                 map->s_fspace.s_bitmap = bitmap;
1060                 bitmap->s_extLength = le32_to_cpu(
1061                                 phd->freedSpaceBitmap.extLength);
1062                 bitmap->s_extPosition = le32_to_cpu(
1063                                 phd->freedSpaceBitmap.extPosition);
1064                 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1065                 udf_debug("freedSpaceBitmap (part %d) @ %d\n", p_index,
1066                                         bitmap->s_extPosition);
1067         }
1068         return 0;
1069 }
1070
1071 static void udf_find_vat_block(struct super_block *sb, int p_index,
1072                                int type1_index, sector_t start_block)
1073 {
1074         struct udf_sb_info *sbi = UDF_SB(sb);
1075         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1076         sector_t vat_block;
1077         struct kernel_lb_addr ino;
1078
1079         /*
1080          * VAT file entry is in the last recorded block. Some broken disks have
1081          * it a few blocks before so try a bit harder...
1082          */
1083         ino.partitionReferenceNum = type1_index;
1084         for (vat_block = start_block;
1085              vat_block >= map->s_partition_root &&
1086              vat_block >= start_block - 3 &&
1087              !sbi->s_vat_inode; vat_block--) {
1088                 ino.logicalBlockNum = vat_block - map->s_partition_root;
1089                 sbi->s_vat_inode = udf_iget(sb, &ino);
1090         }
1091 }
1092
1093 static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1094 {
1095         struct udf_sb_info *sbi = UDF_SB(sb);
1096         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1097         struct buffer_head *bh = NULL;
1098         struct udf_inode_info *vati;
1099         uint32_t pos;
1100         struct virtualAllocationTable20 *vat20;
1101         sector_t blocks = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
1102
1103         udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block);
1104         if (!sbi->s_vat_inode &&
1105             sbi->s_last_block != blocks - 1) {
1106                 pr_notice("Failed to read VAT inode from the last recorded block (%lu), retrying with the last block of the device (%lu).\n",
1107                           (unsigned long)sbi->s_last_block,
1108                           (unsigned long)blocks - 1);
1109                 udf_find_vat_block(sb, p_index, type1_index, blocks - 1);
1110         }
1111         if (!sbi->s_vat_inode)
1112                 return 1;
1113
1114         if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1115                 map->s_type_specific.s_virtual.s_start_offset = 0;
1116                 map->s_type_specific.s_virtual.s_num_entries =
1117                         (sbi->s_vat_inode->i_size - 36) >> 2;
1118         } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1119                 vati = UDF_I(sbi->s_vat_inode);
1120                 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1121                         pos = udf_block_map(sbi->s_vat_inode, 0);
1122                         bh = sb_bread(sb, pos);
1123                         if (!bh)
1124                                 return 1;
1125                         vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1126                 } else {
1127                         vat20 = (struct virtualAllocationTable20 *)
1128                                                         vati->i_ext.i_data;
1129                 }
1130
1131                 map->s_type_specific.s_virtual.s_start_offset =
1132                         le16_to_cpu(vat20->lengthHeader);
1133                 map->s_type_specific.s_virtual.s_num_entries =
1134                         (sbi->s_vat_inode->i_size -
1135                                 map->s_type_specific.s_virtual.
1136                                         s_start_offset) >> 2;
1137                 brelse(bh);
1138         }
1139         return 0;
1140 }
1141
1142 static int udf_load_partdesc(struct super_block *sb, sector_t block)
1143 {
1144         struct buffer_head *bh;
1145         struct partitionDesc *p;
1146         struct udf_part_map *map;
1147         struct udf_sb_info *sbi = UDF_SB(sb);
1148         int i, type1_idx;
1149         uint16_t partitionNumber;
1150         uint16_t ident;
1151         int ret = 0;
1152
1153         bh = udf_read_tagged(sb, block, block, &ident);
1154         if (!bh)
1155                 return 1;
1156         if (ident != TAG_IDENT_PD)
1157                 goto out_bh;
1158
1159         p = (struct partitionDesc *)bh->b_data;
1160         partitionNumber = le16_to_cpu(p->partitionNumber);
1161
1162         /* First scan for TYPE1, SPARABLE and METADATA partitions */
1163         for (i = 0; i < sbi->s_partitions; i++) {
1164                 map = &sbi->s_partmaps[i];
1165                 udf_debug("Searching map: (%d == %d)\n",
1166                           map->s_partition_num, partitionNumber);
1167                 if (map->s_partition_num == partitionNumber &&
1168                     (map->s_partition_type == UDF_TYPE1_MAP15 ||
1169                      map->s_partition_type == UDF_SPARABLE_MAP15))
1170                         break;
1171         }
1172
1173         if (i >= sbi->s_partitions) {
1174                 udf_debug("Partition (%d) not found in partition map\n",
1175                           partitionNumber);
1176                 goto out_bh;
1177         }
1178
1179         ret = udf_fill_partdesc_info(sb, p, i);
1180
1181         /*
1182          * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1183          * PHYSICAL partitions are already set up
1184          */
1185         type1_idx = i;
1186         for (i = 0; i < sbi->s_partitions; i++) {
1187                 map = &sbi->s_partmaps[i];
1188
1189                 if (map->s_partition_num == partitionNumber &&
1190                     (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1191                      map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1192                      map->s_partition_type == UDF_METADATA_MAP25))
1193                         break;
1194         }
1195
1196         if (i >= sbi->s_partitions)
1197                 goto out_bh;
1198
1199         ret = udf_fill_partdesc_info(sb, p, i);
1200         if (ret)
1201                 goto out_bh;
1202
1203         if (map->s_partition_type == UDF_METADATA_MAP25) {
1204                 ret = udf_load_metadata_files(sb, i);
1205                 if (ret) {
1206                         udf_err(sb, "error loading MetaData partition map %d\n",
1207                                 i);
1208                         goto out_bh;
1209                 }
1210         } else {
1211                 ret = udf_load_vat(sb, i, type1_idx);
1212                 if (ret)
1213                         goto out_bh;
1214                 /*
1215                  * Mark filesystem read-only if we have a partition with
1216                  * virtual map since we don't handle writing to it (we
1217                  * overwrite blocks instead of relocating them).
1218                  */
1219                 sb->s_flags |= MS_RDONLY;
1220                 pr_notice("Filesystem marked read-only because writing to pseudooverwrite partition is not implemented\n");
1221         }
1222 out_bh:
1223         /* In case loading failed, we handle cleanup in udf_fill_super */
1224         brelse(bh);
1225         return ret;
1226 }
1227
1228 static int udf_load_logicalvol(struct super_block *sb, sector_t block,
1229                                struct kernel_lb_addr *fileset)
1230 {
1231         struct logicalVolDesc *lvd;
1232         int i, j, offset;
1233         uint8_t type;
1234         struct udf_sb_info *sbi = UDF_SB(sb);
1235         struct genericPartitionMap *gpm;
1236         uint16_t ident;
1237         struct buffer_head *bh;
1238         int ret = 0;
1239
1240         bh = udf_read_tagged(sb, block, block, &ident);
1241         if (!bh)
1242                 return 1;
1243         BUG_ON(ident != TAG_IDENT_LVD);
1244         lvd = (struct logicalVolDesc *)bh->b_data;
1245
1246         i = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1247         if (i != 0) {
1248                 ret = i;
1249                 goto out_bh;
1250         }
1251
1252         for (i = 0, offset = 0;
1253              i < sbi->s_partitions && offset < le32_to_cpu(lvd->mapTableLength);
1254              i++, offset += gpm->partitionMapLength) {
1255                 struct udf_part_map *map = &sbi->s_partmaps[i];
1256                 gpm = (struct genericPartitionMap *)
1257                                 &(lvd->partitionMaps[offset]);
1258                 type = gpm->partitionMapType;
1259                 if (type == 1) {
1260                         struct genericPartitionMap1 *gpm1 =
1261                                 (struct genericPartitionMap1 *)gpm;
1262                         map->s_partition_type = UDF_TYPE1_MAP15;
1263                         map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1264                         map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1265                         map->s_partition_func = NULL;
1266                 } else if (type == 2) {
1267                         struct udfPartitionMap2 *upm2 =
1268                                                 (struct udfPartitionMap2 *)gpm;
1269                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1270                                                 strlen(UDF_ID_VIRTUAL))) {
1271                                 u16 suf =
1272                                         le16_to_cpu(((__le16 *)upm2->partIdent.
1273                                                         identSuffix)[0]);
1274                                 if (suf < 0x0200) {
1275                                         map->s_partition_type =
1276                                                         UDF_VIRTUAL_MAP15;
1277                                         map->s_partition_func =
1278                                                         udf_get_pblock_virt15;
1279                                 } else {
1280                                         map->s_partition_type =
1281                                                         UDF_VIRTUAL_MAP20;
1282                                         map->s_partition_func =
1283                                                         udf_get_pblock_virt20;
1284                                 }
1285                         } else if (!strncmp(upm2->partIdent.ident,
1286                                                 UDF_ID_SPARABLE,
1287                                                 strlen(UDF_ID_SPARABLE))) {
1288                                 uint32_t loc;
1289                                 struct sparingTable *st;
1290                                 struct sparablePartitionMap *spm =
1291                                         (struct sparablePartitionMap *)gpm;
1292
1293                                 map->s_partition_type = UDF_SPARABLE_MAP15;
1294                                 map->s_type_specific.s_sparing.s_packet_len =
1295                                                 le16_to_cpu(spm->packetLength);
1296                                 for (j = 0; j < spm->numSparingTables; j++) {
1297                                         struct buffer_head *bh2;
1298
1299                                         loc = le32_to_cpu(
1300                                                 spm->locSparingTable[j]);
1301                                         bh2 = udf_read_tagged(sb, loc, loc,
1302                                                              &ident);
1303                                         map->s_type_specific.s_sparing.
1304                                                         s_spar_map[j] = bh2;
1305
1306                                         if (bh2 == NULL)
1307                                                 continue;
1308
1309                                         st = (struct sparingTable *)bh2->b_data;
1310                                         if (ident != 0 || strncmp(
1311                                                 st->sparingIdent.ident,
1312                                                 UDF_ID_SPARING,
1313                                                 strlen(UDF_ID_SPARING))) {
1314                                                 brelse(bh2);
1315                                                 map->s_type_specific.s_sparing.
1316                                                         s_spar_map[j] = NULL;
1317                                         }
1318                                 }
1319                                 map->s_partition_func = udf_get_pblock_spar15;
1320                         } else if (!strncmp(upm2->partIdent.ident,
1321                                                 UDF_ID_METADATA,
1322                                                 strlen(UDF_ID_METADATA))) {
1323                                 struct udf_meta_data *mdata =
1324                                         &map->s_type_specific.s_metadata;
1325                                 struct metadataPartitionMap *mdm =
1326                                                 (struct metadataPartitionMap *)
1327                                                 &(lvd->partitionMaps[offset]);
1328                                 udf_debug("Parsing Logical vol part %d "
1329                                         "type %d  id=%s\n", i, type,
1330                                         UDF_ID_METADATA);
1331
1332                                 map->s_partition_type = UDF_METADATA_MAP25;
1333                                 map->s_partition_func = udf_get_pblock_meta25;
1334
1335                                 mdata->s_meta_file_loc   =
1336                                         le32_to_cpu(mdm->metadataFileLoc);
1337                                 mdata->s_mirror_file_loc =
1338                                         le32_to_cpu(mdm->metadataMirrorFileLoc);
1339                                 mdata->s_bitmap_file_loc =
1340                                         le32_to_cpu(mdm->metadataBitmapFileLoc);
1341                                 mdata->s_alloc_unit_size =
1342                                         le32_to_cpu(mdm->allocUnitSize);
1343                                 mdata->s_align_unit_size =
1344                                         le16_to_cpu(mdm->alignUnitSize);
1345                                 mdata->s_dup_md_flag     =
1346                                         mdm->flags & 0x01;
1347
1348                                 udf_debug("Metadata Ident suffix=0x%x\n",
1349                                         (le16_to_cpu(
1350                                          ((__le16 *)
1351                                               mdm->partIdent.identSuffix)[0])));
1352                                 udf_debug("Metadata part num=%d\n",
1353                                         le16_to_cpu(mdm->partitionNum));
1354                                 udf_debug("Metadata part alloc unit size=%d\n",
1355                                         le32_to_cpu(mdm->allocUnitSize));
1356                                 udf_debug("Metadata file loc=%d\n",
1357                                         le32_to_cpu(mdm->metadataFileLoc));
1358                                 udf_debug("Mirror file loc=%d\n",
1359                                        le32_to_cpu(mdm->metadataMirrorFileLoc));
1360                                 udf_debug("Bitmap file loc=%d\n",
1361                                        le32_to_cpu(mdm->metadataBitmapFileLoc));
1362                                 udf_debug("Duplicate Flag: %d %d\n",
1363                                         mdata->s_dup_md_flag, mdm->flags);
1364                         } else {
1365                                 udf_debug("Unknown ident: %s\n",
1366                                           upm2->partIdent.ident);
1367                                 continue;
1368                         }
1369                         map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1370                         map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1371                 }
1372                 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1373                           i, map->s_partition_num, type,
1374                           map->s_volumeseqnum);
1375         }
1376
1377         if (fileset) {
1378                 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
1379
1380                 *fileset = lelb_to_cpu(la->extLocation);
1381                 udf_debug("FileSet found in LogicalVolDesc at block=%d, "
1382                           "partition=%d\n", fileset->logicalBlockNum,
1383                           fileset->partitionReferenceNum);
1384         }
1385         if (lvd->integritySeqExt.extLength)
1386                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1387
1388 out_bh:
1389         brelse(bh);
1390         return ret;
1391 }
1392
1393 /*
1394  * udf_load_logicalvolint
1395  *
1396  */
1397 static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
1398 {
1399         struct buffer_head *bh = NULL;
1400         uint16_t ident;
1401         struct udf_sb_info *sbi = UDF_SB(sb);
1402         struct logicalVolIntegrityDesc *lvid;
1403
1404         while (loc.extLength > 0 &&
1405                (bh = udf_read_tagged(sb, loc.extLocation,
1406                                      loc.extLocation, &ident)) &&
1407                ident == TAG_IDENT_LVID) {
1408                 sbi->s_lvid_bh = bh;
1409                 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1410
1411                 if (lvid->nextIntegrityExt.extLength)
1412                         udf_load_logicalvolint(sb,
1413                                 leea_to_cpu(lvid->nextIntegrityExt));
1414
1415                 if (sbi->s_lvid_bh != bh)
1416                         brelse(bh);
1417                 loc.extLength -= sb->s_blocksize;
1418                 loc.extLocation++;
1419         }
1420         if (sbi->s_lvid_bh != bh)
1421                 brelse(bh);
1422 }
1423
1424 /*
1425  * udf_process_sequence
1426  *
1427  * PURPOSE
1428  *      Process a main/reserve volume descriptor sequence.
1429  *
1430  * PRE-CONDITIONS
1431  *      sb                      Pointer to _locked_ superblock.
1432  *      block                   First block of first extent of the sequence.
1433  *      lastblock               Lastblock of first extent of the sequence.
1434  *
1435  * HISTORY
1436  *      July 1, 1997 - Andrew E. Mileski
1437  *      Written, tested, and released.
1438  */
1439 static noinline int udf_process_sequence(struct super_block *sb, long block,
1440                                 long lastblock, struct kernel_lb_addr *fileset)
1441 {
1442         struct buffer_head *bh = NULL;
1443         struct udf_vds_record vds[VDS_POS_LENGTH];
1444         struct udf_vds_record *curr;
1445         struct generic_desc *gd;
1446         struct volDescPtr *vdp;
1447         int done = 0;
1448         uint32_t vdsn;
1449         uint16_t ident;
1450         long next_s = 0, next_e = 0;
1451
1452         memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1453
1454         /*
1455          * Read the main descriptor sequence and find which descriptors
1456          * are in it.
1457          */
1458         for (; (!done && block <= lastblock); block++) {
1459
1460                 bh = udf_read_tagged(sb, block, block, &ident);
1461                 if (!bh) {
1462                         udf_err(sb,
1463                                 "Block %llu of volume descriptor sequence is corrupted or we could not read it\n",
1464                                 (unsigned long long)block);
1465                         return 1;
1466                 }
1467
1468                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1469                 gd = (struct generic_desc *)bh->b_data;
1470                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1471                 switch (ident) {
1472                 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1473                         curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1474                         if (vdsn >= curr->volDescSeqNum) {
1475                                 curr->volDescSeqNum = vdsn;
1476                                 curr->block = block;
1477                         }
1478                         break;
1479                 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1480                         curr = &vds[VDS_POS_VOL_DESC_PTR];
1481                         if (vdsn >= curr->volDescSeqNum) {
1482                                 curr->volDescSeqNum = vdsn;
1483                                 curr->block = block;
1484
1485                                 vdp = (struct volDescPtr *)bh->b_data;
1486                                 next_s = le32_to_cpu(
1487                                         vdp->nextVolDescSeqExt.extLocation);
1488                                 next_e = le32_to_cpu(
1489                                         vdp->nextVolDescSeqExt.extLength);
1490                                 next_e = next_e >> sb->s_blocksize_bits;
1491                                 next_e += next_s;
1492                         }
1493                         break;
1494                 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1495                         curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1496                         if (vdsn >= curr->volDescSeqNum) {
1497                                 curr->volDescSeqNum = vdsn;
1498                                 curr->block = block;
1499                         }
1500                         break;
1501                 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1502                         curr = &vds[VDS_POS_PARTITION_DESC];
1503                         if (!curr->block)
1504                                 curr->block = block;
1505                         break;
1506                 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1507                         curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1508                         if (vdsn >= curr->volDescSeqNum) {
1509                                 curr->volDescSeqNum = vdsn;
1510                                 curr->block = block;
1511                         }
1512                         break;
1513                 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1514                         curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1515                         if (vdsn >= curr->volDescSeqNum) {
1516                                 curr->volDescSeqNum = vdsn;
1517                                 curr->block = block;
1518                         }
1519                         break;
1520                 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1521                         vds[VDS_POS_TERMINATING_DESC].block = block;
1522                         if (next_e) {
1523                                 block = next_s;
1524                                 lastblock = next_e;
1525                                 next_s = next_e = 0;
1526                         } else
1527                                 done = 1;
1528                         break;
1529                 }
1530                 brelse(bh);
1531         }
1532         /*
1533          * Now read interesting descriptors again and process them
1534          * in a suitable order
1535          */
1536         if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1537                 udf_err(sb, "Primary Volume Descriptor not found!\n");
1538                 return 1;
1539         }
1540         if (udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block))
1541                 return 1;
1542
1543         if (vds[VDS_POS_LOGICAL_VOL_DESC].block && udf_load_logicalvol(sb,
1544             vds[VDS_POS_LOGICAL_VOL_DESC].block, fileset))
1545                 return 1;
1546
1547         if (vds[VDS_POS_PARTITION_DESC].block) {
1548                 /*
1549                  * We rescan the whole descriptor sequence to find
1550                  * partition descriptor blocks and process them.
1551                  */
1552                 for (block = vds[VDS_POS_PARTITION_DESC].block;
1553                      block < vds[VDS_POS_TERMINATING_DESC].block;
1554                      block++)
1555                         if (udf_load_partdesc(sb, block))
1556                                 return 1;
1557         }
1558
1559         return 0;
1560 }
1561
1562 static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh,
1563                              struct kernel_lb_addr *fileset)
1564 {
1565         struct anchorVolDescPtr *anchor;
1566         long main_s, main_e, reserve_s, reserve_e;
1567
1568         anchor = (struct anchorVolDescPtr *)bh->b_data;
1569
1570         /* Locate the main sequence */
1571         main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1572         main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1573         main_e = main_e >> sb->s_blocksize_bits;
1574         main_e += main_s;
1575
1576         /* Locate the reserve sequence */
1577         reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1578         reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1579         reserve_e = reserve_e >> sb->s_blocksize_bits;
1580         reserve_e += reserve_s;
1581
1582         /* Process the main & reserve sequences */
1583         /* responsible for finding the PartitionDesc(s) */
1584         if (!udf_process_sequence(sb, main_s, main_e, fileset))
1585                 return 1;
1586         return !udf_process_sequence(sb, reserve_s, reserve_e, fileset);
1587 }
1588
1589 /*
1590  * Check whether there is an anchor block in the given block and
1591  * load Volume Descriptor Sequence if so.
1592  */
1593 static int udf_check_anchor_block(struct super_block *sb, sector_t block,
1594                                   struct kernel_lb_addr *fileset)
1595 {
1596         struct buffer_head *bh;
1597         uint16_t ident;
1598         int ret;
1599
1600         if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
1601             udf_fixed_to_variable(block) >=
1602             sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits)
1603                 return 0;
1604
1605         bh = udf_read_tagged(sb, block, block, &ident);
1606         if (!bh)
1607                 return 0;
1608         if (ident != TAG_IDENT_AVDP) {
1609                 brelse(bh);
1610                 return 0;
1611         }
1612         ret = udf_load_sequence(sb, bh, fileset);
1613         brelse(bh);
1614         return ret;
1615 }
1616
1617 /* Search for an anchor volume descriptor pointer */
1618 static sector_t udf_scan_anchors(struct super_block *sb, sector_t lastblock,
1619                                  struct kernel_lb_addr *fileset)
1620 {
1621         sector_t last[6];
1622         int i;
1623         struct udf_sb_info *sbi = UDF_SB(sb);
1624         int last_count = 0;
1625
1626         /* First try user provided anchor */
1627         if (sbi->s_anchor) {
1628                 if (udf_check_anchor_block(sb, sbi->s_anchor, fileset))
1629                         return lastblock;
1630         }
1631         /*
1632          * according to spec, anchor is in either:
1633          *     block 256
1634          *     lastblock-256
1635          *     lastblock
1636          *  however, if the disc isn't closed, it could be 512.
1637          */
1638         if (udf_check_anchor_block(sb, sbi->s_session + 256, fileset))
1639                 return lastblock;
1640         /*
1641          * The trouble is which block is the last one. Drives often misreport
1642          * this so we try various possibilities.
1643          */
1644         last[last_count++] = lastblock;
1645         if (lastblock >= 1)
1646                 last[last_count++] = lastblock - 1;
1647         last[last_count++] = lastblock + 1;
1648         if (lastblock >= 2)
1649                 last[last_count++] = lastblock - 2;
1650         if (lastblock >= 150)
1651                 last[last_count++] = lastblock - 150;
1652         if (lastblock >= 152)
1653                 last[last_count++] = lastblock - 152;
1654
1655         for (i = 0; i < last_count; i++) {
1656                 if (last[i] >= sb->s_bdev->bd_inode->i_size >>
1657                                 sb->s_blocksize_bits)
1658                         continue;
1659                 if (udf_check_anchor_block(sb, last[i], fileset))
1660                         return last[i];
1661                 if (last[i] < 256)
1662                         continue;
1663                 if (udf_check_anchor_block(sb, last[i] - 256, fileset))
1664                         return last[i];
1665         }
1666
1667         /* Finally try block 512 in case media is open */
1668         if (udf_check_anchor_block(sb, sbi->s_session + 512, fileset))
1669                 return last[0];
1670         return 0;
1671 }
1672
1673 /*
1674  * Find an anchor volume descriptor and load Volume Descriptor Sequence from
1675  * area specified by it. The function expects sbi->s_lastblock to be the last
1676  * block on the media.
1677  *
1678  * Return 1 if ok, 0 if not found.
1679  *
1680  */
1681 static int udf_find_anchor(struct super_block *sb,
1682                            struct kernel_lb_addr *fileset)
1683 {
1684         sector_t lastblock;
1685         struct udf_sb_info *sbi = UDF_SB(sb);
1686
1687         lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1688         if (lastblock)
1689                 goto out;
1690
1691         /* No anchor found? Try VARCONV conversion of block numbers */
1692         UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
1693         /* Firstly, we try to not convert number of the last block */
1694         lastblock = udf_scan_anchors(sb,
1695                                 udf_variable_to_fixed(sbi->s_last_block),
1696                                 fileset);
1697         if (lastblock)
1698                 goto out;
1699
1700         /* Secondly, we try with converted number of the last block */
1701         lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1702         if (!lastblock) {
1703                 /* VARCONV didn't help. Clear it. */
1704                 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
1705                 return 0;
1706         }
1707 out:
1708         sbi->s_last_block = lastblock;
1709         return 1;
1710 }
1711
1712 /*
1713  * Check Volume Structure Descriptor, find Anchor block and load Volume
1714  * Descriptor Sequence
1715  */
1716 static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
1717                         int silent, struct kernel_lb_addr *fileset)
1718 {
1719         struct udf_sb_info *sbi = UDF_SB(sb);
1720         loff_t nsr_off;
1721
1722         if (!sb_set_blocksize(sb, uopt->blocksize)) {
1723                 if (!silent)
1724                         udf_warn(sb, "Bad block size\n");
1725                 return 0;
1726         }
1727         sbi->s_last_block = uopt->lastblock;
1728         if (!uopt->novrs) {
1729                 /* Check that it is NSR02 compliant */
1730                 nsr_off = udf_check_vsd(sb);
1731                 if (!nsr_off) {
1732                         if (!silent)
1733                                 udf_warn(sb, "No VRS found\n");
1734                         return 0;
1735                 }
1736                 if (nsr_off == -1)
1737                         udf_debug("Failed to read byte 32768. Assuming open "
1738                                   "disc. Skipping validity check\n");
1739                 if (!sbi->s_last_block)
1740                         sbi->s_last_block = udf_get_last_block(sb);
1741         } else {
1742                 udf_debug("Validity check skipped because of novrs option\n");
1743         }
1744
1745         /* Look for anchor block and load Volume Descriptor Sequence */
1746         sbi->s_anchor = uopt->anchor;
1747         if (!udf_find_anchor(sb, fileset)) {
1748                 if (!silent)
1749                         udf_warn(sb, "No anchor found\n");
1750                 return 0;
1751         }
1752         return 1;
1753 }
1754
1755 static void udf_open_lvid(struct super_block *sb)
1756 {
1757         struct udf_sb_info *sbi = UDF_SB(sb);
1758         struct buffer_head *bh = sbi->s_lvid_bh;
1759         struct logicalVolIntegrityDesc *lvid;
1760         struct logicalVolIntegrityDescImpUse *lvidiu;
1761
1762         if (!bh)
1763                 return;
1764
1765         mutex_lock(&sbi->s_alloc_mutex);
1766         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1767         lvidiu = udf_sb_lvidiu(sbi);
1768
1769         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1770         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1771         udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
1772                                 CURRENT_TIME);
1773         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN);
1774
1775         lvid->descTag.descCRC = cpu_to_le16(
1776                 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1777                         le16_to_cpu(lvid->descTag.descCRCLength)));
1778
1779         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1780         mark_buffer_dirty(bh);
1781         sbi->s_lvid_dirty = 0;
1782         mutex_unlock(&sbi->s_alloc_mutex);
1783 }
1784
1785 static void udf_close_lvid(struct super_block *sb)
1786 {
1787         struct udf_sb_info *sbi = UDF_SB(sb);
1788         struct buffer_head *bh = sbi->s_lvid_bh;
1789         struct logicalVolIntegrityDesc *lvid;
1790         struct logicalVolIntegrityDescImpUse *lvidiu;
1791
1792         if (!bh)
1793                 return;
1794
1795         mutex_lock(&sbi->s_alloc_mutex);
1796         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1797         lvidiu = udf_sb_lvidiu(sbi);
1798         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1799         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1800         udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
1801         if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1802                 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1803         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1804                 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1805         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
1806                 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
1807         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1808
1809         lvid->descTag.descCRC = cpu_to_le16(
1810                         crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1811                                 le16_to_cpu(lvid->descTag.descCRCLength)));
1812
1813         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1814         mark_buffer_dirty(bh);
1815         sbi->s_lvid_dirty = 0;
1816         mutex_unlock(&sbi->s_alloc_mutex);
1817 }
1818
1819 u64 lvid_get_unique_id(struct super_block *sb)
1820 {
1821         struct buffer_head *bh;
1822         struct udf_sb_info *sbi = UDF_SB(sb);
1823         struct logicalVolIntegrityDesc *lvid;
1824         struct logicalVolHeaderDesc *lvhd;
1825         u64 uniqueID;
1826         u64 ret;
1827
1828         bh = sbi->s_lvid_bh;
1829         if (!bh)
1830                 return 0;
1831
1832         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1833         lvhd = (struct logicalVolHeaderDesc *)lvid->logicalVolContentsUse;
1834
1835         mutex_lock(&sbi->s_alloc_mutex);
1836         ret = uniqueID = le64_to_cpu(lvhd->uniqueID);
1837         if (!(++uniqueID & 0xFFFFFFFF))
1838                 uniqueID += 16;
1839         lvhd->uniqueID = cpu_to_le64(uniqueID);
1840         mutex_unlock(&sbi->s_alloc_mutex);
1841         mark_buffer_dirty(bh);
1842
1843         return ret;
1844 }
1845
1846 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
1847 {
1848         int i;
1849         int nr_groups = bitmap->s_nr_groups;
1850         int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
1851                                                 nr_groups);
1852
1853         for (i = 0; i < nr_groups; i++)
1854                 if (bitmap->s_block_bitmap[i])
1855                         brelse(bitmap->s_block_bitmap[i]);
1856
1857         if (size <= PAGE_SIZE)
1858                 kfree(bitmap);
1859         else
1860                 vfree(bitmap);
1861 }
1862
1863 static void udf_free_partition(struct udf_part_map *map)
1864 {
1865         int i;
1866         struct udf_meta_data *mdata;
1867
1868         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1869                 iput(map->s_uspace.s_table);
1870         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1871                 iput(map->s_fspace.s_table);
1872         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1873                 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
1874         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1875                 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
1876         if (map->s_partition_type == UDF_SPARABLE_MAP15)
1877                 for (i = 0; i < 4; i++)
1878                         brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
1879         else if (map->s_partition_type == UDF_METADATA_MAP25) {
1880                 mdata = &map->s_type_specific.s_metadata;
1881                 iput(mdata->s_metadata_fe);
1882                 mdata->s_metadata_fe = NULL;
1883
1884                 iput(mdata->s_mirror_fe);
1885                 mdata->s_mirror_fe = NULL;
1886
1887                 iput(mdata->s_bitmap_fe);
1888                 mdata->s_bitmap_fe = NULL;
1889         }
1890 }
1891
1892 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1893 {
1894         int i;
1895         int ret;
1896         struct inode *inode = NULL;
1897         struct udf_options uopt;
1898         struct kernel_lb_addr rootdir, fileset;
1899         struct udf_sb_info *sbi;
1900
1901         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1902         uopt.uid = -1;
1903         uopt.gid = -1;
1904         uopt.umask = 0;
1905         uopt.fmode = UDF_INVALID_MODE;
1906         uopt.dmode = UDF_INVALID_MODE;
1907
1908         sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1909         if (!sbi)
1910                 return -ENOMEM;
1911
1912         sb->s_fs_info = sbi;
1913
1914         mutex_init(&sbi->s_alloc_mutex);
1915
1916         if (!udf_parse_options((char *)options, &uopt, false))
1917                 goto error_out;
1918
1919         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1920             uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
1921                 udf_err(sb, "utf8 cannot be combined with iocharset\n");
1922                 goto error_out;
1923         }
1924 #ifdef CONFIG_UDF_NLS
1925         if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1926                 uopt.nls_map = load_nls_default();
1927                 if (!uopt.nls_map)
1928                         uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1929                 else
1930                         udf_debug("Using default NLS map\n");
1931         }
1932 #endif
1933         if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1934                 uopt.flags |= (1 << UDF_FLAG_UTF8);
1935
1936         fileset.logicalBlockNum = 0xFFFFFFFF;
1937         fileset.partitionReferenceNum = 0xFFFF;
1938
1939         sbi->s_flags = uopt.flags;
1940         sbi->s_uid = uopt.uid;
1941         sbi->s_gid = uopt.gid;
1942         sbi->s_umask = uopt.umask;
1943         sbi->s_fmode = uopt.fmode;
1944         sbi->s_dmode = uopt.dmode;
1945         sbi->s_nls_map = uopt.nls_map;
1946         rwlock_init(&sbi->s_cred_lock);
1947
1948         if (uopt.session == 0xFFFFFFFF)
1949                 sbi->s_session = udf_get_last_session(sb);
1950         else
1951                 sbi->s_session = uopt.session;
1952
1953         udf_debug("Multi-session=%d\n", sbi->s_session);
1954
1955         /* Fill in the rest of the superblock */
1956         sb->s_op = &udf_sb_ops;
1957         sb->s_export_op = &udf_export_ops;
1958
1959         sb->s_dirt = 0;
1960         sb->s_magic = UDF_SUPER_MAGIC;
1961         sb->s_time_gran = 1000;
1962
1963         if (uopt.flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) {
1964                 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1965         } else {
1966                 uopt.blocksize = bdev_logical_block_size(sb->s_bdev);
1967                 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1968                 if (!ret && uopt.blocksize != UDF_DEFAULT_BLOCKSIZE) {
1969                         if (!silent)
1970                                 pr_notice("Rescanning with blocksize %d\n",
1971                                           UDF_DEFAULT_BLOCKSIZE);
1972                         uopt.blocksize = UDF_DEFAULT_BLOCKSIZE;
1973                         ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1974                 }
1975         }
1976         if (!ret) {
1977                 udf_warn(sb, "No partition found (1)\n");
1978                 goto error_out;
1979         }
1980
1981         udf_debug("Lastblock=%d\n", sbi->s_last_block);
1982
1983         if (sbi->s_lvid_bh) {
1984                 struct logicalVolIntegrityDescImpUse *lvidiu =
1985                                                         udf_sb_lvidiu(sbi);
1986                 uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
1987                 uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
1988                 /* uint16_t maxUDFWriteRev =
1989                                 le16_to_cpu(lvidiu->maxUDFWriteRev); */
1990
1991                 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
1992                         udf_err(sb, "minUDFReadRev=%x (max is %x)\n",
1993                                 le16_to_cpu(lvidiu->minUDFReadRev),
1994                                 UDF_MAX_READ_VERSION);
1995                         goto error_out;
1996                 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
1997                         sb->s_flags |= MS_RDONLY;
1998
1999                 sbi->s_udfrev = minUDFWriteRev;
2000
2001                 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
2002                         UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
2003                 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
2004                         UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
2005         }
2006
2007         if (!sbi->s_partitions) {
2008                 udf_warn(sb, "No partition found (2)\n");
2009                 goto error_out;
2010         }
2011
2012         if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
2013                         UDF_PART_FLAG_READ_ONLY) {
2014                 pr_notice("Partition marked readonly; forcing readonly mount\n");
2015                 sb->s_flags |= MS_RDONLY;
2016         }
2017
2018         if (udf_find_fileset(sb, &fileset, &rootdir)) {
2019                 udf_warn(sb, "No fileset found\n");
2020                 goto error_out;
2021         }
2022
2023         if (!silent) {
2024                 struct timestamp ts;
2025                 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
2026                 udf_info("Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
2027                          sbi->s_volume_ident,
2028                          le16_to_cpu(ts.year), ts.month, ts.day,
2029                          ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
2030         }
2031         if (!(sb->s_flags & MS_RDONLY))
2032                 udf_open_lvid(sb);
2033
2034         /* Assign the root inode */
2035         /* assign inodes by physical block number */
2036         /* perhaps it's not extensible enough, but for now ... */
2037         inode = udf_iget(sb, &rootdir);
2038         if (!inode) {
2039                 udf_err(sb, "Error in udf_iget, block=%d, partition=%d\n",
2040                        rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
2041                 goto error_out;
2042         }
2043
2044         /* Allocate a dentry for the root inode */
2045         sb->s_root = d_alloc_root(inode);
2046         if (!sb->s_root) {
2047                 udf_err(sb, "Couldn't allocate root dentry\n");
2048                 iput(inode);
2049                 goto error_out;
2050         }
2051         sb->s_maxbytes = MAX_LFS_FILESIZE;
2052         return 0;
2053
2054 error_out:
2055         if (sbi->s_vat_inode)
2056                 iput(sbi->s_vat_inode);
2057         if (sbi->s_partitions)
2058                 for (i = 0; i < sbi->s_partitions; i++)
2059                         udf_free_partition(&sbi->s_partmaps[i]);
2060 #ifdef CONFIG_UDF_NLS
2061         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2062                 unload_nls(sbi->s_nls_map);
2063 #endif
2064         if (!(sb->s_flags & MS_RDONLY))
2065                 udf_close_lvid(sb);
2066         brelse(sbi->s_lvid_bh);
2067
2068         kfree(sbi->s_partmaps);
2069         kfree(sbi);
2070         sb->s_fs_info = NULL;
2071
2072         return -EINVAL;
2073 }
2074
2075 void _udf_err(struct super_block *sb, const char *function,
2076               const char *fmt, ...)
2077 {
2078         struct va_format vaf;
2079         va_list args;
2080
2081         /* mark sb error */
2082         if (!(sb->s_flags & MS_RDONLY))
2083                 sb->s_dirt = 1;
2084
2085         va_start(args, fmt);
2086
2087         vaf.fmt = fmt;
2088         vaf.va = &args;
2089
2090         pr_err("error (device %s): %s: %pV", sb->s_id, function, &vaf);
2091
2092         va_end(args);
2093 }
2094
2095 void _udf_warn(struct super_block *sb, const char *function,
2096                const char *fmt, ...)
2097 {
2098         struct va_format vaf;
2099         va_list args;
2100
2101         va_start(args, fmt);
2102
2103         vaf.fmt = fmt;
2104         vaf.va = &args;
2105
2106         pr_warn("warning (device %s): %s: %pV", sb->s_id, function, &vaf);
2107
2108         va_end(args);
2109 }
2110
2111 static void udf_put_super(struct super_block *sb)
2112 {
2113         int i;
2114         struct udf_sb_info *sbi;
2115
2116         sbi = UDF_SB(sb);
2117
2118         if (sbi->s_vat_inode)
2119                 iput(sbi->s_vat_inode);
2120         if (sbi->s_partitions)
2121                 for (i = 0; i < sbi->s_partitions; i++)
2122                         udf_free_partition(&sbi->s_partmaps[i]);
2123 #ifdef CONFIG_UDF_NLS
2124         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2125                 unload_nls(sbi->s_nls_map);
2126 #endif
2127         if (!(sb->s_flags & MS_RDONLY))
2128                 udf_close_lvid(sb);
2129         brelse(sbi->s_lvid_bh);
2130         kfree(sbi->s_partmaps);
2131         kfree(sb->s_fs_info);
2132         sb->s_fs_info = NULL;
2133 }
2134
2135 static int udf_sync_fs(struct super_block *sb, int wait)
2136 {
2137         struct udf_sb_info *sbi = UDF_SB(sb);
2138
2139         mutex_lock(&sbi->s_alloc_mutex);
2140         if (sbi->s_lvid_dirty) {
2141                 /*
2142                  * Blockdevice will be synced later so we don't have to submit
2143                  * the buffer for IO
2144                  */
2145                 mark_buffer_dirty(sbi->s_lvid_bh);
2146                 sb->s_dirt = 0;
2147                 sbi->s_lvid_dirty = 0;
2148         }
2149         mutex_unlock(&sbi->s_alloc_mutex);
2150
2151         return 0;
2152 }
2153
2154 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
2155 {
2156         struct super_block *sb = dentry->d_sb;
2157         struct udf_sb_info *sbi = UDF_SB(sb);
2158         struct logicalVolIntegrityDescImpUse *lvidiu;
2159         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
2160
2161         if (sbi->s_lvid_bh != NULL)
2162                 lvidiu = udf_sb_lvidiu(sbi);
2163         else
2164                 lvidiu = NULL;
2165
2166         buf->f_type = UDF_SUPER_MAGIC;
2167         buf->f_bsize = sb->s_blocksize;
2168         buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
2169         buf->f_bfree = udf_count_free(sb);
2170         buf->f_bavail = buf->f_bfree;
2171         buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2172                                           le32_to_cpu(lvidiu->numDirs)) : 0)
2173                         + buf->f_bfree;
2174         buf->f_ffree = buf->f_bfree;
2175         buf->f_namelen = UDF_NAME_LEN - 2;
2176         buf->f_fsid.val[0] = (u32)id;
2177         buf->f_fsid.val[1] = (u32)(id >> 32);
2178
2179         return 0;
2180 }
2181
2182 static unsigned int udf_count_free_bitmap(struct super_block *sb,
2183                                           struct udf_bitmap *bitmap)
2184 {
2185         struct buffer_head *bh = NULL;
2186         unsigned int accum = 0;
2187         int index;
2188         int block = 0, newblock;
2189         struct kernel_lb_addr loc;
2190         uint32_t bytes;
2191         uint8_t *ptr;
2192         uint16_t ident;
2193         struct spaceBitmapDesc *bm;
2194
2195         loc.logicalBlockNum = bitmap->s_extPosition;
2196         loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
2197         bh = udf_read_ptagged(sb, &loc, 0, &ident);
2198
2199         if (!bh) {
2200                 udf_err(sb, "udf_count_free failed\n");
2201                 goto out;
2202         } else if (ident != TAG_IDENT_SBD) {
2203                 brelse(bh);
2204                 udf_err(sb, "udf_count_free failed\n");
2205                 goto out;
2206         }
2207
2208         bm = (struct spaceBitmapDesc *)bh->b_data;
2209         bytes = le32_to_cpu(bm->numOfBytes);
2210         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2211         ptr = (uint8_t *)bh->b_data;
2212
2213         while (bytes > 0) {
2214                 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2215                 accum += bitmap_weight((const unsigned long *)(ptr + index),
2216                                         cur_bytes * 8);
2217                 bytes -= cur_bytes;
2218                 if (bytes) {
2219                         brelse(bh);
2220                         newblock = udf_get_lb_pblock(sb, &loc, ++block);
2221                         bh = udf_tread(sb, newblock);
2222                         if (!bh) {
2223                                 udf_debug("read failed\n");
2224                                 goto out;
2225                         }
2226                         index = 0;
2227                         ptr = (uint8_t *)bh->b_data;
2228                 }
2229         }
2230         brelse(bh);
2231 out:
2232         return accum;
2233 }
2234
2235 static unsigned int udf_count_free_table(struct super_block *sb,
2236                                          struct inode *table)
2237 {
2238         unsigned int accum = 0;
2239         uint32_t elen;
2240         struct kernel_lb_addr eloc;
2241         int8_t etype;
2242         struct extent_position epos;
2243
2244         mutex_lock(&UDF_SB(sb)->s_alloc_mutex);
2245         epos.block = UDF_I(table)->i_location;
2246         epos.offset = sizeof(struct unallocSpaceEntry);
2247         epos.bh = NULL;
2248
2249         while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2250                 accum += (elen >> table->i_sb->s_blocksize_bits);
2251
2252         brelse(epos.bh);
2253         mutex_unlock(&UDF_SB(sb)->s_alloc_mutex);
2254
2255         return accum;
2256 }
2257
2258 static unsigned int udf_count_free(struct super_block *sb)
2259 {
2260         unsigned int accum = 0;
2261         struct udf_sb_info *sbi;
2262         struct udf_part_map *map;
2263
2264         sbi = UDF_SB(sb);
2265         if (sbi->s_lvid_bh) {
2266                 struct logicalVolIntegrityDesc *lvid =
2267                         (struct logicalVolIntegrityDesc *)
2268                         sbi->s_lvid_bh->b_data;
2269                 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
2270                         accum = le32_to_cpu(
2271                                         lvid->freeSpaceTable[sbi->s_partition]);
2272                         if (accum == 0xFFFFFFFF)
2273                                 accum = 0;
2274                 }
2275         }
2276
2277         if (accum)
2278                 return accum;
2279
2280         map = &sbi->s_partmaps[sbi->s_partition];
2281         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2282                 accum += udf_count_free_bitmap(sb,
2283                                                map->s_uspace.s_bitmap);
2284         }
2285         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
2286                 accum += udf_count_free_bitmap(sb,
2287                                                map->s_fspace.s_bitmap);
2288         }
2289         if (accum)
2290                 return accum;
2291
2292         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2293                 accum += udf_count_free_table(sb,
2294                                               map->s_uspace.s_table);
2295         }
2296         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
2297                 accum += udf_count_free_table(sb,
2298                                               map->s_fspace.s_table);
2299         }
2300
2301         return accum;
2302 }