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 found\n");
 643                                 break;
 644                         case 2:
 645                                 udf_debug("ISO9660 Supplementary Volume Descriptor found\n");
 646                                 break;
 647                         case 3:
 648                                 udf_debug("ISO9660 Volume Partition Descriptor found\n");
 649                                 break;
 650                         case 255:
 651                                 udf_debug("ISO9660 Volume Descriptor Set Terminator found\n");
 652                                 break;
 653                         default:
 654                                 udf_debug("ISO9660 VRS (%u) found\n",
 655                                           vsd->structType);
 656                                 break;
 657                         }
 658                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
 659                                     VSD_STD_ID_LEN))
 660                         ; /* nothing */
 661                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
 662                                     VSD_STD_ID_LEN)) {
 663                         brelse(bh);
 664                         break;
 665                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
 666                                     VSD_STD_ID_LEN))
 667                         nsr02 = sector;
 668                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
 669                                     VSD_STD_ID_LEN))
 670                         nsr03 = sector;
 671                 brelse(bh);
 672         }
 673
 674         if (nsr03)
 675                 return nsr03;
 676         else if (nsr02)
 677                 return nsr02;
 678         else if (sector - (sbi->s_session << sb->s_blocksize_bits) == 32768)
 679                 return -1;
 680         else
 681                 return 0;
 682 }
 683
 684 static int udf_find_fileset(struct super_block *sb,
 685                             struct kernel_lb_addr *fileset,
 686                             struct kernel_lb_addr *root)
 687 {
 688         struct buffer_head *bh = NULL;
 689         long lastblock;
 690         uint16_t ident;
 691         struct udf_sb_info *sbi;
 692
 693         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
 694             fileset->partitionReferenceNum != 0xFFFF) {
 695                 bh = udf_read_ptagged(sb, fileset, 0, &ident);
 696
 697                 if (!bh) {
 698                         return 1;
 699                 } else if (ident != TAG_IDENT_FSD) {
 700                         brelse(bh);
 701                         return 1;
 702                 }
 703
 704         }
 705
 706         sbi = UDF_SB(sb);
 707         if (!bh) {
 708                 /* Search backwards through the partitions */
 709                 struct kernel_lb_addr newfileset;
 710
 711 /* --> cvg: FIXME - is it reasonable? */
 712                 return 1;
 713
 714                 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
 715                      (newfileset.partitionReferenceNum != 0xFFFF &&
 716                       fileset->logicalBlockNum == 0xFFFFFFFF &&
 717                       fileset->partitionReferenceNum == 0xFFFF);
 718                      newfileset.partitionReferenceNum--) {
 719                         lastblock = sbi->s_partmaps
 720                                         [newfileset.partitionReferenceNum]
 721                                                 .s_partition_len;
 722                         newfileset.logicalBlockNum = 0;
 723
 724                         do {
 725                                 bh = udf_read_ptagged(sb, &newfileset, 0,
 726                                                       &ident);
 727                                 if (!bh) {
 728                                         newfileset.logicalBlockNum++;
 729                                         continue;
 730                                 }
 731
 732                                 switch (ident) {
 733                                 case TAG_IDENT_SBD:
 734                                 {
 735                                         struct spaceBitmapDesc *sp;
 736                                         sp = (struct spaceBitmapDesc *)
 737                                                                 bh->b_data;
 738                                         newfileset.logicalBlockNum += 1 +
 739                                                 ((le32_to_cpu(sp->numOfBytes) +
 740                                                   sizeof(struct spaceBitmapDesc)
 741                                                   - 1) >> sb->s_blocksize_bits);
 742                                         brelse(bh);
 743                                         break;
 744                                 }
 745                                 case TAG_IDENT_FSD:
 746                                         *fileset = newfileset;
 747                                         break;
 748                                 default:
 749                                         newfileset.logicalBlockNum++;
 750                                         brelse(bh);
 751                                         bh = NULL;
 752                                         break;
 753                                 }
 754                         } while (newfileset.logicalBlockNum < lastblock &&
 755                                  fileset->logicalBlockNum == 0xFFFFFFFF &&
 756                                  fileset->partitionReferenceNum == 0xFFFF);
 757                 }
 758         }
 759
 760         if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
 761              fileset->partitionReferenceNum != 0xFFFF) && bh) {
 762                 udf_debug("Fileset at block=%d, partition=%d\n",
 763                           fileset->logicalBlockNum,
 764                           fileset->partitionReferenceNum);
 765
 766                 sbi->s_partition = fileset->partitionReferenceNum;
 767                 udf_load_fileset(sb, bh, root);
 768                 brelse(bh);
 769                 return 0;
 770         }
 771         return 1;
 772 }
 773
 774 static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
 775 {
 776         struct primaryVolDesc *pvoldesc;
 777         struct ustr *instr, *outstr;
 778         struct buffer_head *bh;
 779         uint16_t ident;
 780         int ret = 1;
 781
 782         instr = kmalloc(sizeof(struct ustr), GFP_NOFS);
 783         if (!instr)
 784                 return 1;
 785
 786         outstr = kmalloc(sizeof(struct ustr), GFP_NOFS);
 787         if (!outstr)
 788                 goto out1;
 789
 790         bh = udf_read_tagged(sb, block, block, &ident);
 791         if (!bh)
 792                 goto out2;
 793
 794         BUG_ON(ident != TAG_IDENT_PVD);
 795
 796         pvoldesc = (struct primaryVolDesc *)bh->b_data;
 797
 798         if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
 799                               pvoldesc->recordingDateAndTime)) {
 800 #ifdef UDFFS_DEBUG
 801                 struct timestamp *ts = &pvoldesc->recordingDateAndTime;
 802                 udf_debug("recording time %04u/%02u/%02u %02u:%02u (%x)\n",
 803                           le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
 804                           ts->minute, le16_to_cpu(ts->typeAndTimezone));
 805 #endif
 806         }
 807
 808         if (!udf_build_ustr(instr, pvoldesc->volIdent, 32))
 809                 if (udf_CS0toUTF8(outstr, instr)) {
 810                         strncpy(UDF_SB(sb)->s_volume_ident, outstr->u_name,
 811                                 outstr->u_len > 31 ? 31 : outstr->u_len);
 812                         udf_debug("volIdent[] = '%s'\n",
 813                                   UDF_SB(sb)->s_volume_ident);
 814                 }
 815
 816         if (!udf_build_ustr(instr, pvoldesc->volSetIdent, 128))
 817                 if (udf_CS0toUTF8(outstr, instr))
 818                         udf_debug("volSetIdent[] = '%s'\n", outstr->u_name);
 819
 820         brelse(bh);
 821         ret = 0;
 822 out2:
 823         kfree(outstr);
 824 out1:
 825         kfree(instr);
 826         return ret;
 827 }
 828
 829 struct inode *udf_find_metadata_inode_efe(struct super_block *sb,
 830                                         u32 meta_file_loc, u32 partition_num)
 831 {
 832         struct kernel_lb_addr addr;
 833         struct inode *metadata_fe;
 834
 835         addr.logicalBlockNum = meta_file_loc;
 836         addr.partitionReferenceNum = partition_num;
 837
 838         metadata_fe = udf_iget(sb, &addr);
 839
 840         if (metadata_fe == NULL)
 841                 udf_warn(sb, "metadata inode efe not found\n");
 842         else if (UDF_I(metadata_fe)->i_alloc_type != ICBTAG_FLAG_AD_SHORT) {
 843                 udf_warn(sb, "metadata inode efe does not have short allocation descriptors!\n");
 844                 iput(metadata_fe);
 845                 metadata_fe = NULL;
 846         }
 847
 848         return metadata_fe;
 849 }
 850
 851 static int udf_load_metadata_files(struct super_block *sb, int partition)
 852 {
 853         struct udf_sb_info *sbi = UDF_SB(sb);
 854         struct udf_part_map *map;
 855         struct udf_meta_data *mdata;
 856         struct kernel_lb_addr addr;
 857
 858         map = &sbi->s_partmaps[partition];
 859         mdata = &map->s_type_specific.s_metadata;
 860
 861         /* metadata address */
 862         udf_debug("Metadata file location: block = %d part = %d\n",
 863                   mdata->s_meta_file_loc, map->s_partition_num);
 864
 865         mdata->s_metadata_fe = udf_find_metadata_inode_efe(sb,
 866                 mdata->s_meta_file_loc, map->s_partition_num);
 867
 868         if (mdata->s_metadata_fe == NULL) {
 869                 /* mirror file entry */
 870                 udf_debug("Mirror metadata file location: block = %d part = %d\n",
 871                           mdata->s_mirror_file_loc, map->s_partition_num);
 872
 873                 mdata->s_mirror_fe = udf_find_metadata_inode_efe(sb,
 874                         mdata->s_mirror_file_loc, map->s_partition_num);
 875
 876                 if (mdata->s_mirror_fe == NULL) {
 877                         udf_err(sb, "Both metadata and mirror metadata inode efe can not found\n");
 878                         goto error_exit;
 879                 }
 880         }
 881
 882         /*
 883          * bitmap file entry
 884          * Note:
 885          * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
 886         */
 887         if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
 888                 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
 889                 addr.partitionReferenceNum = map->s_partition_num;
 890
 891                 udf_debug("Bitmap file location: block = %d part = %d\n",
 892                           addr.logicalBlockNum, addr.partitionReferenceNum);
 893
 894                 mdata->s_bitmap_fe = udf_iget(sb, &addr);
 895
 896                 if (mdata->s_bitmap_fe == NULL) {
 897                         if (sb->s_flags & MS_RDONLY)
 898                                 udf_warn(sb, "bitmap inode efe not found but it's ok since the disc is mounted read-only\n");
 899                         else {
 900                                 udf_err(sb, "bitmap inode efe not found and attempted read-write mount\n");
 901                                 goto error_exit;
 902                         }
 903                 }
 904         }
 905
 906         udf_debug("udf_load_metadata_files Ok\n");
 907
 908         return 0;
 909
 910 error_exit:
 911         return 1;
 912 }
 913
 914 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
 915                              struct kernel_lb_addr *root)
 916 {
 917         struct fileSetDesc *fset;
 918
 919         fset = (struct fileSetDesc *)bh->b_data;
 920
 921         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
 922
 923         UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
 924
 925         udf_debug("Rootdir at block=%d, partition=%d\n",
 926                   root->logicalBlockNum, root->partitionReferenceNum);
 927 }
 928
 929 int udf_compute_nr_groups(struct super_block *sb, u32 partition)
 930 {
 931         struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
 932         return DIV_ROUND_UP(map->s_partition_len +
 933                             (sizeof(struct spaceBitmapDesc) << 3),
 934                             sb->s_blocksize * 8);
 935 }
 936
 937 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
 938 {
 939         struct udf_bitmap *bitmap;
 940         int nr_groups;
 941         int size;
 942
 943         nr_groups = udf_compute_nr_groups(sb, index);
 944         size = sizeof(struct udf_bitmap) +
 945                 (sizeof(struct buffer_head *) * nr_groups);
 946
 947         if (size <= PAGE_SIZE)
 948                 bitmap = kzalloc(size, GFP_KERNEL);
 949         else
 950                 bitmap = vzalloc(size); /* TODO: get rid of vzalloc */
 951
 952         if (bitmap == NULL) {
 953                 udf_err(sb, "Unable to allocate space for bitmap and %d buffer_head pointers\n",
 954                         nr_groups);
 955                 return NULL;
 956         }
 957
 958         bitmap->s_block_bitmap = (struct buffer_head **)(bitmap + 1);
 959         bitmap->s_nr_groups = nr_groups;
 960         return bitmap;
 961 }
 962
 963 static int udf_fill_partdesc_info(struct super_block *sb,
 964                 struct partitionDesc *p, int p_index)
 965 {
 966         struct udf_part_map *map;
 967         struct udf_sb_info *sbi = UDF_SB(sb);
 968         struct partitionHeaderDesc *phd;
 969
 970         map = &sbi->s_partmaps[p_index];
 971
 972         map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
 973         map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
 974
 975         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
 976                 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
 977         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
 978                 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
 979         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
 980                 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
 981         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
 982                 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
 983
 984         udf_debug("Partition (%d type %x) starts at physical %d, block length %d\n",
 985                   p_index, map->s_partition_type,
 986                   map->s_partition_root, map->s_partition_len);
 987
 988         if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
 989             strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
 990                 return 0;
 991
 992         phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
 993         if (phd->unallocSpaceTable.extLength) {
 994                 struct kernel_lb_addr loc = {
 995                         .logicalBlockNum = le32_to_cpu(
 996                                 phd->unallocSpaceTable.extPosition),
 997                         .partitionReferenceNum = p_index,
 998                 };
 999
1000                 map->s_uspace.s_table = udf_iget(sb, &loc);
1001                 if (!map->s_uspace.s_table) {
1002                         udf_debug("cannot load unallocSpaceTable (part %d)\n",
1003                                   p_index);
1004                         return 1;
1005                 }
1006                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1007                 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
1008                           p_index, map->s_uspace.s_table->i_ino);
1009         }
1010
1011         if (phd->unallocSpaceBitmap.extLength) {
1012                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1013                 if (!bitmap)
1014                         return 1;
1015                 map->s_uspace.s_bitmap = bitmap;
1016                 bitmap->s_extLength = le32_to_cpu(
1017                                 phd->unallocSpaceBitmap.extLength);
1018                 bitmap->s_extPosition = le32_to_cpu(
1019                                 phd->unallocSpaceBitmap.extPosition);
1020                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1021                 udf_debug("unallocSpaceBitmap (part %d) @ %d\n",
1022                           p_index, bitmap->s_extPosition);
1023         }
1024
1025         if (phd->partitionIntegrityTable.extLength)
1026                 udf_debug("partitionIntegrityTable (part %d)\n", p_index);
1027
1028         if (phd->freedSpaceTable.extLength) {
1029                 struct kernel_lb_addr loc = {
1030                         .logicalBlockNum = le32_to_cpu(
1031                                 phd->freedSpaceTable.extPosition),
1032                         .partitionReferenceNum = p_index,
1033                 };
1034
1035                 map->s_fspace.s_table = udf_iget(sb, &loc);
1036                 if (!map->s_fspace.s_table) {
1037                         udf_debug("cannot load freedSpaceTable (part %d)\n",
1038                                   p_index);
1039                         return 1;
1040                 }
1041
1042                 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
1043                 udf_debug("freedSpaceTable (part %d) @ %ld\n",
1044                           p_index, map->s_fspace.s_table->i_ino);
1045         }
1046
1047         if (phd->freedSpaceBitmap.extLength) {
1048                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1049                 if (!bitmap)
1050                         return 1;
1051                 map->s_fspace.s_bitmap = bitmap;
1052                 bitmap->s_extLength = le32_to_cpu(
1053                                 phd->freedSpaceBitmap.extLength);
1054                 bitmap->s_extPosition = le32_to_cpu(
1055                                 phd->freedSpaceBitmap.extPosition);
1056                 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1057                 udf_debug("freedSpaceBitmap (part %d) @ %d\n",
1058                           p_index, bitmap->s_extPosition);
1059         }
1060         return 0;
1061 }
1062
1063 static void udf_find_vat_block(struct super_block *sb, int p_index,
1064                                int type1_index, sector_t start_block)
1065 {
1066         struct udf_sb_info *sbi = UDF_SB(sb);
1067         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1068         sector_t vat_block;
1069         struct kernel_lb_addr ino;
1070
1071         /*
1072          * VAT file entry is in the last recorded block. Some broken disks have
1073          * it a few blocks before so try a bit harder...
1074          */
1075         ino.partitionReferenceNum = type1_index;
1076         for (vat_block = start_block;
1077              vat_block >= map->s_partition_root &&
1078              vat_block >= start_block - 3 &&
1079              !sbi->s_vat_inode; vat_block--) {
1080                 ino.logicalBlockNum = vat_block - map->s_partition_root;
1081                 sbi->s_vat_inode = udf_iget(sb, &ino);
1082         }
1083 }
1084
1085 static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1086 {
1087         struct udf_sb_info *sbi = UDF_SB(sb);
1088         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1089         struct buffer_head *bh = NULL;
1090         struct udf_inode_info *vati;
1091         uint32_t pos;
1092         struct virtualAllocationTable20 *vat20;
1093         sector_t blocks = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
1094
1095         udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block);
1096         if (!sbi->s_vat_inode &&
1097             sbi->s_last_block != blocks - 1) {
1098                 pr_notice("Failed to read VAT inode from the last recorded block (%lu), retrying with the last block of the device (%lu).\n",
1099                           (unsigned long)sbi->s_last_block,
1100                           (unsigned long)blocks - 1);
1101                 udf_find_vat_block(sb, p_index, type1_index, blocks - 1);
1102         }
1103         if (!sbi->s_vat_inode)
1104                 return 1;
1105
1106         if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1107                 map->s_type_specific.s_virtual.s_start_offset = 0;
1108                 map->s_type_specific.s_virtual.s_num_entries =
1109                         (sbi->s_vat_inode->i_size - 36) >> 2;
1110         } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1111                 vati = UDF_I(sbi->s_vat_inode);
1112                 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1113                         pos = udf_block_map(sbi->s_vat_inode, 0);
1114                         bh = sb_bread(sb, pos);
1115                         if (!bh)
1116                                 return 1;
1117                         vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1118                 } else {
1119                         vat20 = (struct virtualAllocationTable20 *)
1120                                                         vati->i_ext.i_data;
1121                 }
1122
1123                 map->s_type_specific.s_virtual.s_start_offset =
1124                         le16_to_cpu(vat20->lengthHeader);
1125                 map->s_type_specific.s_virtual.s_num_entries =
1126                         (sbi->s_vat_inode->i_size -
1127                                 map->s_type_specific.s_virtual.
1128                                         s_start_offset) >> 2;
1129                 brelse(bh);
1130         }
1131         return 0;
1132 }
1133
1134 static int udf_load_partdesc(struct super_block *sb, sector_t block)
1135 {
1136         struct buffer_head *bh;
1137         struct partitionDesc *p;
1138         struct udf_part_map *map;
1139         struct udf_sb_info *sbi = UDF_SB(sb);
1140         int i, type1_idx;
1141         uint16_t partitionNumber;
1142         uint16_t ident;
1143         int ret = 0;
1144
1145         bh = udf_read_tagged(sb, block, block, &ident);
1146         if (!bh)
1147                 return 1;
1148         if (ident != TAG_IDENT_PD)
1149                 goto out_bh;
1150
1151         p = (struct partitionDesc *)bh->b_data;
1152         partitionNumber = le16_to_cpu(p->partitionNumber);
1153
1154         /* First scan for TYPE1, SPARABLE and METADATA partitions */
1155         for (i = 0; i < sbi->s_partitions; i++) {
1156                 map = &sbi->s_partmaps[i];
1157                 udf_debug("Searching map: (%d == %d)\n",
1158                           map->s_partition_num, partitionNumber);
1159                 if (map->s_partition_num == partitionNumber &&
1160                     (map->s_partition_type == UDF_TYPE1_MAP15 ||
1161                      map->s_partition_type == UDF_SPARABLE_MAP15))
1162                         break;
1163         }
1164
1165         if (i >= sbi->s_partitions) {
1166                 udf_debug("Partition (%d) not found in partition map\n",
1167                           partitionNumber);
1168                 goto out_bh;
1169         }
1170
1171         ret = udf_fill_partdesc_info(sb, p, i);
1172
1173         /*
1174          * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1175          * PHYSICAL partitions are already set up
1176          */
1177         type1_idx = i;
1178         for (i = 0; i < sbi->s_partitions; i++) {
1179                 map = &sbi->s_partmaps[i];
1180
1181                 if (map->s_partition_num == partitionNumber &&
1182                     (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1183                      map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1184                      map->s_partition_type == UDF_METADATA_MAP25))
1185                         break;
1186         }
1187
1188         if (i >= sbi->s_partitions)
1189                 goto out_bh;
1190
1191         ret = udf_fill_partdesc_info(sb, p, i);
1192         if (ret)
1193                 goto out_bh;
1194
1195         if (map->s_partition_type == UDF_METADATA_MAP25) {
1196                 ret = udf_load_metadata_files(sb, i);
1197                 if (ret) {
1198                         udf_err(sb, "error loading MetaData partition map %d\n",
1199                                 i);
1200                         goto out_bh;
1201                 }
1202         } else {
1203                 ret = udf_load_vat(sb, i, type1_idx);
1204                 if (ret)
1205                         goto out_bh;
1206                 /*
1207                  * Mark filesystem read-only if we have a partition with
1208                  * virtual map since we don't handle writing to it (we
1209                  * overwrite blocks instead of relocating them).
1210                  */
1211                 sb->s_flags |= MS_RDONLY;
1212                 pr_notice("Filesystem marked read-only because writing to pseudooverwrite partition is not implemented\n");
1213         }
1214 out_bh:
1215         /* In case loading failed, we handle cleanup in udf_fill_super */
1216         brelse(bh);
1217         return ret;
1218 }
1219
1220 static int udf_load_logicalvol(struct super_block *sb, sector_t block,
1221                                struct kernel_lb_addr *fileset)
1222 {
1223         struct logicalVolDesc *lvd;
1224         int i, j, offset;
1225         uint8_t type;
1226         struct udf_sb_info *sbi = UDF_SB(sb);
1227         struct genericPartitionMap *gpm;
1228         uint16_t ident;
1229         struct buffer_head *bh;
1230         int ret = 0;
1231
1232         bh = udf_read_tagged(sb, block, block, &ident);
1233         if (!bh)
1234                 return 1;
1235         BUG_ON(ident != TAG_IDENT_LVD);
1236         lvd = (struct logicalVolDesc *)bh->b_data;
1237
1238         i = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1239         if (i != 0) {
1240                 ret = i;
1241                 goto out_bh;
1242         }
1243
1244         for (i = 0, offset = 0;
1245              i < sbi->s_partitions && offset < le32_to_cpu(lvd->mapTableLength);
1246              i++, offset += gpm->partitionMapLength) {
1247                 struct udf_part_map *map = &sbi->s_partmaps[i];
1248                 gpm = (struct genericPartitionMap *)
1249                                 &(lvd->partitionMaps[offset]);
1250                 type = gpm->partitionMapType;
1251                 if (type == 1) {
1252                         struct genericPartitionMap1 *gpm1 =
1253                                 (struct genericPartitionMap1 *)gpm;
1254                         map->s_partition_type = UDF_TYPE1_MAP15;
1255                         map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1256                         map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1257                         map->s_partition_func = NULL;
1258                 } else if (type == 2) {
1259                         struct udfPartitionMap2 *upm2 =
1260                                                 (struct udfPartitionMap2 *)gpm;
1261                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1262                                                 strlen(UDF_ID_VIRTUAL))) {
1263                                 u16 suf =
1264                                         le16_to_cpu(((__le16 *)upm2->partIdent.
1265                                                         identSuffix)[0]);
1266                                 if (suf < 0x0200) {
1267                                         map->s_partition_type =
1268                                                         UDF_VIRTUAL_MAP15;
1269                                         map->s_partition_func =
1270                                                         udf_get_pblock_virt15;
1271                                 } else {
1272                                         map->s_partition_type =
1273                                                         UDF_VIRTUAL_MAP20;
1274                                         map->s_partition_func =
1275                                                         udf_get_pblock_virt20;
1276                                 }
1277                         } else if (!strncmp(upm2->partIdent.ident,
1278                                                 UDF_ID_SPARABLE,
1279                                                 strlen(UDF_ID_SPARABLE))) {
1280                                 uint32_t loc;
1281                                 struct sparingTable *st;
1282                                 struct sparablePartitionMap *spm =
1283                                         (struct sparablePartitionMap *)gpm;
1284
1285                                 map->s_partition_type = UDF_SPARABLE_MAP15;
1286                                 map->s_type_specific.s_sparing.s_packet_len =
1287                                                 le16_to_cpu(spm->packetLength);
1288                                 for (j = 0; j < spm->numSparingTables; j++) {
1289                                         struct buffer_head *bh2;
1290
1291                                         loc = le32_to_cpu(
1292                                                 spm->locSparingTable[j]);
1293                                         bh2 = udf_read_tagged(sb, loc, loc,
1294                                                              &ident);
1295                                         map->s_type_specific.s_sparing.
1296                                                         s_spar_map[j] = bh2;
1297
1298                                         if (bh2 == NULL)
1299                                                 continue;
1300
1301                                         st = (struct sparingTable *)bh2->b_data;
1302                                         if (ident != 0 || strncmp(
1303                                                 st->sparingIdent.ident,
1304                                                 UDF_ID_SPARING,
1305                                                 strlen(UDF_ID_SPARING))) {
1306                                                 brelse(bh2);
1307                                                 map->s_type_specific.s_sparing.
1308                                                         s_spar_map[j] = NULL;
1309                                         }
1310                                 }
1311                                 map->s_partition_func = udf_get_pblock_spar15;
1312                         } else if (!strncmp(upm2->partIdent.ident,
1313                                                 UDF_ID_METADATA,
1314                                                 strlen(UDF_ID_METADATA))) {
1315                                 struct udf_meta_data *mdata =
1316                                         &map->s_type_specific.s_metadata;
1317                                 struct metadataPartitionMap *mdm =
1318                                                 (struct metadataPartitionMap *)
1319                                                 &(lvd->partitionMaps[offset]);
1320                                 udf_debug("Parsing Logical vol part %d type %d  id=%s\n",
1321                                           i, type, UDF_ID_METADATA);
1322
1323                                 map->s_partition_type = UDF_METADATA_MAP25;
1324                                 map->s_partition_func = udf_get_pblock_meta25;
1325
1326                                 mdata->s_meta_file_loc   =
1327                                         le32_to_cpu(mdm->metadataFileLoc);
1328                                 mdata->s_mirror_file_loc =
1329                                         le32_to_cpu(mdm->metadataMirrorFileLoc);
1330                                 mdata->s_bitmap_file_loc =
1331                                         le32_to_cpu(mdm->metadataBitmapFileLoc);
1332                                 mdata->s_alloc_unit_size =
1333                                         le32_to_cpu(mdm->allocUnitSize);
1334                                 mdata->s_align_unit_size =
1335                                         le16_to_cpu(mdm->alignUnitSize);
1336                                 if (mdm->flags & 0x01)
1337                                         mdata->s_flags |= MF_DUPLICATE_MD;
1338
1339                                 udf_debug("Metadata Ident suffix=0x%x\n",
1340                                           le16_to_cpu(*(__le16 *)
1341                                                       mdm->partIdent.identSuffix));
1342                                 udf_debug("Metadata part num=%d\n",
1343                                           le16_to_cpu(mdm->partitionNum));
1344                                 udf_debug("Metadata part alloc unit size=%d\n",
1345                                           le32_to_cpu(mdm->allocUnitSize));
1346                                 udf_debug("Metadata file loc=%d\n",
1347                                           le32_to_cpu(mdm->metadataFileLoc));
1348                                 udf_debug("Mirror file loc=%d\n",
1349                                           le32_to_cpu(mdm->metadataMirrorFileLoc));
1350                                 udf_debug("Bitmap file loc=%d\n",
1351                                           le32_to_cpu(mdm->metadataBitmapFileLoc));
1352                                 udf_debug("Flags: %d %d\n",
1353                                           mdata->s_flags, mdm->flags);
1354                         } else {
1355                                 udf_debug("Unknown ident: %s\n",
1356                                           upm2->partIdent.ident);
1357                                 continue;
1358                         }
1359                         map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1360                         map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1361                 }
1362                 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1363                           i, map->s_partition_num, type, map->s_volumeseqnum);
1364         }
1365
1366         if (fileset) {
1367                 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
1368
1369                 *fileset = lelb_to_cpu(la->extLocation);
1370                 udf_debug("FileSet found in LogicalVolDesc at block=%d, partition=%d\n",
1371                           fileset->logicalBlockNum,
1372                           fileset->partitionReferenceNum);
1373         }
1374         if (lvd->integritySeqExt.extLength)
1375                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1376
1377 out_bh:
1378         brelse(bh);
1379         return ret;
1380 }
1381
1382 /*
1383  * udf_load_logicalvolint
1384  *
1385  */
1386 static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
1387 {
1388         struct buffer_head *bh = NULL;
1389         uint16_t ident;
1390         struct udf_sb_info *sbi = UDF_SB(sb);
1391         struct logicalVolIntegrityDesc *lvid;
1392
1393         while (loc.extLength > 0 &&
1394                (bh = udf_read_tagged(sb, loc.extLocation,
1395                                      loc.extLocation, &ident)) &&
1396                ident == TAG_IDENT_LVID) {
1397                 sbi->s_lvid_bh = bh;
1398                 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1399
1400                 if (lvid->nextIntegrityExt.extLength)
1401                         udf_load_logicalvolint(sb,
1402                                 leea_to_cpu(lvid->nextIntegrityExt));
1403
1404                 if (sbi->s_lvid_bh != bh)
1405                         brelse(bh);
1406                 loc.extLength -= sb->s_blocksize;
1407                 loc.extLocation++;
1408         }
1409         if (sbi->s_lvid_bh != bh)
1410                 brelse(bh);
1411 }
1412
1413 /*
1414  * udf_process_sequence
1415  *
1416  * PURPOSE
1417  *      Process a main/reserve volume descriptor sequence.
1418  *
1419  * PRE-CONDITIONS
1420  *      sb                      Pointer to _locked_ superblock.
1421  *      block                   First block of first extent of the sequence.
1422  *      lastblock               Lastblock of first extent of the sequence.
1423  *
1424  * HISTORY
1425  *      July 1, 1997 - Andrew E. Mileski
1426  *      Written, tested, and released.
1427  */
1428 static noinline int udf_process_sequence(struct super_block *sb, long block,
1429                                 long lastblock, struct kernel_lb_addr *fileset)
1430 {
1431         struct buffer_head *bh = NULL;
1432         struct udf_vds_record vds[VDS_POS_LENGTH];
1433         struct udf_vds_record *curr;
1434         struct generic_desc *gd;
1435         struct volDescPtr *vdp;
1436         int done = 0;
1437         uint32_t vdsn;
1438         uint16_t ident;
1439         long next_s = 0, next_e = 0;
1440
1441         memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1442
1443         /*
1444          * Read the main descriptor sequence and find which descriptors
1445          * are in it.
1446          */
1447         for (; (!done && block <= lastblock); block++) {
1448
1449                 bh = udf_read_tagged(sb, block, block, &ident);
1450                 if (!bh) {
1451                         udf_err(sb,
1452                                 "Block %llu of volume descriptor sequence is corrupted or we could not read it\n",
1453                                 (unsigned long long)block);
1454                         return 1;
1455                 }
1456
1457                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1458                 gd = (struct generic_desc *)bh->b_data;
1459                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1460                 switch (ident) {
1461                 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1462                         curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1463                         if (vdsn >= curr->volDescSeqNum) {
1464                                 curr->volDescSeqNum = vdsn;
1465                                 curr->block = block;
1466                         }
1467                         break;
1468                 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1469                         curr = &vds[VDS_POS_VOL_DESC_PTR];
1470                         if (vdsn >= curr->volDescSeqNum) {
1471                                 curr->volDescSeqNum = vdsn;
1472                                 curr->block = block;
1473
1474                                 vdp = (struct volDescPtr *)bh->b_data;
1475                                 next_s = le32_to_cpu(
1476                                         vdp->nextVolDescSeqExt.extLocation);
1477                                 next_e = le32_to_cpu(
1478                                         vdp->nextVolDescSeqExt.extLength);
1479                                 next_e = next_e >> sb->s_blocksize_bits;
1480                                 next_e += next_s;
1481                         }
1482                         break;
1483                 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1484                         curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1485                         if (vdsn >= curr->volDescSeqNum) {
1486                                 curr->volDescSeqNum = vdsn;
1487                                 curr->block = block;
1488                         }
1489                         break;
1490                 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1491                         curr = &vds[VDS_POS_PARTITION_DESC];
1492                         if (!curr->block)
1493                                 curr->block = block;
1494                         break;
1495                 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1496                         curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1497                         if (vdsn >= curr->volDescSeqNum) {
1498                                 curr->volDescSeqNum = vdsn;
1499                                 curr->block = block;
1500                         }
1501                         break;
1502                 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1503                         curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1504                         if (vdsn >= curr->volDescSeqNum) {
1505                                 curr->volDescSeqNum = vdsn;
1506                                 curr->block = block;
1507                         }
1508                         break;
1509                 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1510                         vds[VDS_POS_TERMINATING_DESC].block = block;
1511                         if (next_e) {
1512                                 block = next_s;
1513                                 lastblock = next_e;
1514                                 next_s = next_e = 0;
1515                         } else
1516                                 done = 1;
1517                         break;
1518                 }
1519                 brelse(bh);
1520         }
1521         /*
1522          * Now read interesting descriptors again and process them
1523          * in a suitable order
1524          */
1525         if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1526                 udf_err(sb, "Primary Volume Descriptor not found!\n");
1527                 return 1;
1528         }
1529         if (udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block))
1530                 return 1;
1531
1532         if (vds[VDS_POS_LOGICAL_VOL_DESC].block && udf_load_logicalvol(sb,
1533             vds[VDS_POS_LOGICAL_VOL_DESC].block, fileset))
1534                 return 1;
1535
1536         if (vds[VDS_POS_PARTITION_DESC].block) {
1537                 /*
1538                  * We rescan the whole descriptor sequence to find
1539                  * partition descriptor blocks and process them.
1540                  */
1541                 for (block = vds[VDS_POS_PARTITION_DESC].block;
1542                      block < vds[VDS_POS_TERMINATING_DESC].block;
1543                      block++)
1544                         if (udf_load_partdesc(sb, block))
1545                                 return 1;
1546         }
1547
1548         return 0;
1549 }
1550
1551 static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh,
1552                              struct kernel_lb_addr *fileset)
1553 {
1554         struct anchorVolDescPtr *anchor;
1555         long main_s, main_e, reserve_s, reserve_e;
1556
1557         anchor = (struct anchorVolDescPtr *)bh->b_data;
1558
1559         /* Locate the main sequence */
1560         main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1561         main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1562         main_e = main_e >> sb->s_blocksize_bits;
1563         main_e += main_s;
1564
1565         /* Locate the reserve sequence */
1566         reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1567         reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1568         reserve_e = reserve_e >> sb->s_blocksize_bits;
1569         reserve_e += reserve_s;
1570
1571         /* Process the main & reserve sequences */
1572         /* responsible for finding the PartitionDesc(s) */
1573         if (!udf_process_sequence(sb, main_s, main_e, fileset))
1574                 return 1;
1575         return !udf_process_sequence(sb, reserve_s, reserve_e, fileset);
1576 }
1577
1578 /*
1579  * Check whether there is an anchor block in the given block and
1580  * load Volume Descriptor Sequence if so.
1581  */
1582 static int udf_check_anchor_block(struct super_block *sb, sector_t block,
1583                                   struct kernel_lb_addr *fileset)
1584 {
1585         struct buffer_head *bh;
1586         uint16_t ident;
1587         int ret;
1588
1589         if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
1590             udf_fixed_to_variable(block) >=
1591             sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits)
1592                 return 0;
1593
1594         bh = udf_read_tagged(sb, block, block, &ident);
1595         if (!bh)
1596                 return 0;
1597         if (ident != TAG_IDENT_AVDP) {
1598                 brelse(bh);
1599                 return 0;
1600         }
1601         ret = udf_load_sequence(sb, bh, fileset);
1602         brelse(bh);
1603         return ret;
1604 }
1605
1606 /* Search for an anchor volume descriptor pointer */
1607 static sector_t udf_scan_anchors(struct super_block *sb, sector_t lastblock,
1608                                  struct kernel_lb_addr *fileset)
1609 {
1610         sector_t last[6];
1611         int i;
1612         struct udf_sb_info *sbi = UDF_SB(sb);
1613         int last_count = 0;
1614
1615         /* First try user provided anchor */
1616         if (sbi->s_anchor) {
1617                 if (udf_check_anchor_block(sb, sbi->s_anchor, fileset))
1618                         return lastblock;
1619         }
1620         /*
1621          * according to spec, anchor is in either:
1622          *     block 256
1623          *     lastblock-256
1624          *     lastblock
1625          *  however, if the disc isn't closed, it could be 512.
1626          */
1627         if (udf_check_anchor_block(sb, sbi->s_session + 256, fileset))
1628                 return lastblock;
1629         /*
1630          * The trouble is which block is the last one. Drives often misreport
1631          * this so we try various possibilities.
1632          */
1633         last[last_count++] = lastblock;
1634         if (lastblock >= 1)
1635                 last[last_count++] = lastblock - 1;
1636         last[last_count++] = lastblock + 1;
1637         if (lastblock >= 2)
1638                 last[last_count++] = lastblock - 2;
1639         if (lastblock >= 150)
1640                 last[last_count++] = lastblock - 150;
1641         if (lastblock >= 152)
1642                 last[last_count++] = lastblock - 152;
1643
1644         for (i = 0; i < last_count; i++) {
1645                 if (last[i] >= sb->s_bdev->bd_inode->i_size >>
1646                                 sb->s_blocksize_bits)
1647                         continue;
1648                 if (udf_check_anchor_block(sb, last[i], fileset))
1649                         return last[i];
1650                 if (last[i] < 256)
1651                         continue;
1652                 if (udf_check_anchor_block(sb, last[i] - 256, fileset))
1653                         return last[i];
1654         }
1655
1656         /* Finally try block 512 in case media is open */
1657         if (udf_check_anchor_block(sb, sbi->s_session + 512, fileset))
1658                 return last[0];
1659         return 0;
1660 }
1661
1662 /*
1663  * Find an anchor volume descriptor and load Volume Descriptor Sequence from
1664  * area specified by it. The function expects sbi->s_lastblock to be the last
1665  * block on the media.
1666  *
1667  * Return 1 if ok, 0 if not found.
1668  *
1669  */
1670 static int udf_find_anchor(struct super_block *sb,
1671                            struct kernel_lb_addr *fileset)
1672 {
1673         sector_t lastblock;
1674         struct udf_sb_info *sbi = UDF_SB(sb);
1675
1676         lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1677         if (lastblock)
1678                 goto out;
1679
1680         /* No anchor found? Try VARCONV conversion of block numbers */
1681         UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
1682         /* Firstly, we try to not convert number of the last block */
1683         lastblock = udf_scan_anchors(sb,
1684                                 udf_variable_to_fixed(sbi->s_last_block),
1685                                 fileset);
1686         if (lastblock)
1687                 goto out;
1688
1689         /* Secondly, we try with converted number of the last block */
1690         lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1691         if (!lastblock) {
1692                 /* VARCONV didn't help. Clear it. */
1693                 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
1694                 return 0;
1695         }
1696 out:
1697         sbi->s_last_block = lastblock;
1698         return 1;
1699 }
1700
1701 /*
1702  * Check Volume Structure Descriptor, find Anchor block and load Volume
1703  * Descriptor Sequence
1704  */
1705 static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
1706                         int silent, struct kernel_lb_addr *fileset)
1707 {
1708         struct udf_sb_info *sbi = UDF_SB(sb);
1709         loff_t nsr_off;
1710
1711         if (!sb_set_blocksize(sb, uopt->blocksize)) {
1712                 if (!silent)
1713                         udf_warn(sb, "Bad block size\n");
1714                 return 0;
1715         }
1716         sbi->s_last_block = uopt->lastblock;
1717         if (!uopt->novrs) {
1718                 /* Check that it is NSR02 compliant */
1719                 nsr_off = udf_check_vsd(sb);
1720                 if (!nsr_off) {
1721                         if (!silent)
1722                                 udf_warn(sb, "No VRS found\n");
1723                         return 0;
1724                 }
1725                 if (nsr_off == -1)
1726                         udf_debug("Failed to read byte 32768. Assuming open disc. Skipping validity check\n");
1727                 if (!sbi->s_last_block)
1728                         sbi->s_last_block = udf_get_last_block(sb);
1729         } else {
1730                 udf_debug("Validity check skipped because of novrs option\n");
1731         }
1732
1733         /* Look for anchor block and load Volume Descriptor Sequence */
1734         sbi->s_anchor = uopt->anchor;
1735         if (!udf_find_anchor(sb, fileset)) {
1736                 if (!silent)
1737                         udf_warn(sb, "No anchor found\n");
1738                 return 0;
1739         }
1740         return 1;
1741 }
1742
1743 static void udf_open_lvid(struct super_block *sb)
1744 {
1745         struct udf_sb_info *sbi = UDF_SB(sb);
1746         struct buffer_head *bh = sbi->s_lvid_bh;
1747         struct logicalVolIntegrityDesc *lvid;
1748         struct logicalVolIntegrityDescImpUse *lvidiu;
1749
1750         if (!bh)
1751                 return;
1752
1753         mutex_lock(&sbi->s_alloc_mutex);
1754         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1755         lvidiu = udf_sb_lvidiu(sbi);
1756
1757         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1758         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1759         udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
1760                                 CURRENT_TIME);
1761         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN);
1762
1763         lvid->descTag.descCRC = cpu_to_le16(
1764                 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1765                         le16_to_cpu(lvid->descTag.descCRCLength)));
1766
1767         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1768         mark_buffer_dirty(bh);
1769         sbi->s_lvid_dirty = 0;
1770         mutex_unlock(&sbi->s_alloc_mutex);
1771 }
1772
1773 static void udf_close_lvid(struct super_block *sb)
1774 {
1775         struct udf_sb_info *sbi = UDF_SB(sb);
1776         struct buffer_head *bh = sbi->s_lvid_bh;
1777         struct logicalVolIntegrityDesc *lvid;
1778         struct logicalVolIntegrityDescImpUse *lvidiu;
1779
1780         if (!bh)
1781                 return;
1782
1783         mutex_lock(&sbi->s_alloc_mutex);
1784         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1785         lvidiu = udf_sb_lvidiu(sbi);
1786         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1787         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1788         udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
1789         if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1790                 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1791         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1792                 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1793         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
1794                 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
1795         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1796
1797         lvid->descTag.descCRC = cpu_to_le16(
1798                         crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1799                                 le16_to_cpu(lvid->descTag.descCRCLength)));
1800
1801         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1802         /*
1803          * We set buffer uptodate unconditionally here to avoid spurious
1804          * warnings from mark_buffer_dirty() when previous EIO has marked
1805          * the buffer as !uptodate
1806          */
1807         set_buffer_uptodate(bh);
1808         mark_buffer_dirty(bh);
1809         sbi->s_lvid_dirty = 0;
1810         mutex_unlock(&sbi->s_alloc_mutex);
1811 }
1812
1813 u64 lvid_get_unique_id(struct super_block *sb)
1814 {
1815         struct buffer_head *bh;
1816         struct udf_sb_info *sbi = UDF_SB(sb);
1817         struct logicalVolIntegrityDesc *lvid;
1818         struct logicalVolHeaderDesc *lvhd;
1819         u64 uniqueID;
1820         u64 ret;
1821
1822         bh = sbi->s_lvid_bh;
1823         if (!bh)
1824                 return 0;
1825
1826         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1827         lvhd = (struct logicalVolHeaderDesc *)lvid->logicalVolContentsUse;
1828
1829         mutex_lock(&sbi->s_alloc_mutex);
1830         ret = uniqueID = le64_to_cpu(lvhd->uniqueID);
1831         if (!(++uniqueID & 0xFFFFFFFF))
1832                 uniqueID += 16;
1833         lvhd->uniqueID = cpu_to_le64(uniqueID);
1834         mutex_unlock(&sbi->s_alloc_mutex);
1835         mark_buffer_dirty(bh);
1836
1837         return ret;
1838 }
1839
1840 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
1841 {
1842         int i;
1843         int nr_groups = bitmap->s_nr_groups;
1844         int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
1845                                                 nr_groups);
1846
1847         for (i = 0; i < nr_groups; i++)
1848                 if (bitmap->s_block_bitmap[i])
1849                         brelse(bitmap->s_block_bitmap[i]);
1850
1851         if (size <= PAGE_SIZE)
1852                 kfree(bitmap);
1853         else
1854                 vfree(bitmap);
1855 }
1856
1857 static void udf_free_partition(struct udf_part_map *map)
1858 {
1859         int i;
1860         struct udf_meta_data *mdata;
1861
1862         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1863                 iput(map->s_uspace.s_table);
1864         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1865                 iput(map->s_fspace.s_table);
1866         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1867                 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
1868         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1869                 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
1870         if (map->s_partition_type == UDF_SPARABLE_MAP15)
1871                 for (i = 0; i < 4; i++)
1872                         brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
1873         else if (map->s_partition_type == UDF_METADATA_MAP25) {
1874                 mdata = &map->s_type_specific.s_metadata;
1875                 iput(mdata->s_metadata_fe);
1876                 mdata->s_metadata_fe = NULL;
1877
1878                 iput(mdata->s_mirror_fe);
1879                 mdata->s_mirror_fe = NULL;
1880
1881                 iput(mdata->s_bitmap_fe);
1882                 mdata->s_bitmap_fe = NULL;
1883         }
1884 }
1885
1886 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1887 {
1888         int i;
1889         int ret;
1890         struct inode *inode = NULL;
1891         struct udf_options uopt;
1892         struct kernel_lb_addr rootdir, fileset;
1893         struct udf_sb_info *sbi;
1894
1895         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1896         uopt.uid = -1;
1897         uopt.gid = -1;
1898         uopt.umask = 0;
1899         uopt.fmode = UDF_INVALID_MODE;
1900         uopt.dmode = UDF_INVALID_MODE;
1901
1902         sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1903         if (!sbi)
1904                 return -ENOMEM;
1905
1906         sb->s_fs_info = sbi;
1907
1908         mutex_init(&sbi->s_alloc_mutex);
1909
1910         if (!udf_parse_options((char *)options, &uopt, false))
1911                 goto error_out;
1912
1913         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1914             uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
1915                 udf_err(sb, "utf8 cannot be combined with iocharset\n");
1916                 goto error_out;
1917         }
1918 #ifdef CONFIG_UDF_NLS
1919         if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1920                 uopt.nls_map = load_nls_default();
1921                 if (!uopt.nls_map)
1922                         uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1923                 else
1924                         udf_debug("Using default NLS map\n");
1925         }
1926 #endif
1927         if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1928                 uopt.flags |= (1 << UDF_FLAG_UTF8);
1929
1930         fileset.logicalBlockNum = 0xFFFFFFFF;
1931         fileset.partitionReferenceNum = 0xFFFF;
1932
1933         sbi->s_flags = uopt.flags;
1934         sbi->s_uid = uopt.uid;
1935         sbi->s_gid = uopt.gid;
1936         sbi->s_umask = uopt.umask;
1937         sbi->s_fmode = uopt.fmode;
1938         sbi->s_dmode = uopt.dmode;
1939         sbi->s_nls_map = uopt.nls_map;
1940         rwlock_init(&sbi->s_cred_lock);
1941
1942         if (uopt.session == 0xFFFFFFFF)
1943                 sbi->s_session = udf_get_last_session(sb);
1944         else
1945                 sbi->s_session = uopt.session;
1946
1947         udf_debug("Multi-session=%d\n", sbi->s_session);
1948
1949         /* Fill in the rest of the superblock */
1950         sb->s_op = &udf_sb_ops;
1951         sb->s_export_op = &udf_export_ops;
1952
1953         sb->s_dirt = 0;
1954         sb->s_magic = UDF_SUPER_MAGIC;
1955         sb->s_time_gran = 1000;
1956
1957         if (uopt.flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) {
1958                 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1959         } else {
1960                 uopt.blocksize = bdev_logical_block_size(sb->s_bdev);
1961                 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1962                 if (!ret && uopt.blocksize != UDF_DEFAULT_BLOCKSIZE) {
1963                         if (!silent)
1964                                 pr_notice("Rescanning with blocksize %d\n",
1965                                           UDF_DEFAULT_BLOCKSIZE);
1966                         uopt.blocksize = UDF_DEFAULT_BLOCKSIZE;
1967                         ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1968                 }
1969         }
1970         if (!ret) {
1971                 udf_warn(sb, "No partition found (1)\n");
1972                 goto error_out;
1973         }
1974
1975         udf_debug("Lastblock=%d\n", sbi->s_last_block);
1976
1977         if (sbi->s_lvid_bh) {
1978                 struct logicalVolIntegrityDescImpUse *lvidiu =
1979                                                         udf_sb_lvidiu(sbi);
1980                 uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
1981                 uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
1982                 /* uint16_t maxUDFWriteRev =
1983                                 le16_to_cpu(lvidiu->maxUDFWriteRev); */
1984
1985                 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
1986                         udf_err(sb, "minUDFReadRev=%x (max is %x)\n",
1987                                 le16_to_cpu(lvidiu->minUDFReadRev),
1988                                 UDF_MAX_READ_VERSION);
1989                         goto error_out;
1990                 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
1991                         sb->s_flags |= MS_RDONLY;
1992
1993                 sbi->s_udfrev = minUDFWriteRev;
1994
1995                 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1996                         UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
1997                 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
1998                         UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
1999         }
2000
2001         if (!sbi->s_partitions) {
2002                 udf_warn(sb, "No partition found (2)\n");
2003                 goto error_out;
2004         }
2005
2006         if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
2007                         UDF_PART_FLAG_READ_ONLY) {
2008                 pr_notice("Partition marked readonly; forcing readonly mount\n");
2009                 sb->s_flags |= MS_RDONLY;
2010         }
2011
2012         if (udf_find_fileset(sb, &fileset, &rootdir)) {
2013                 udf_warn(sb, "No fileset found\n");
2014                 goto error_out;
2015         }
2016
2017         if (!silent) {
2018                 struct timestamp ts;
2019                 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
2020                 udf_info("Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
2021                          sbi->s_volume_ident,
2022                          le16_to_cpu(ts.year), ts.month, ts.day,
2023                          ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
2024         }
2025         if (!(sb->s_flags & MS_RDONLY))
2026                 udf_open_lvid(sb);
2027
2028         /* Assign the root inode */
2029         /* assign inodes by physical block number */
2030         /* perhaps it's not extensible enough, but for now ... */
2031         inode = udf_iget(sb, &rootdir);
2032         if (!inode) {
2033                 udf_err(sb, "Error in udf_iget, block=%d, partition=%d\n",
2034                        rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
2035                 goto error_out;
2036         }
2037
2038         /* Allocate a dentry for the root inode */
2039         sb->s_root = d_alloc_root(inode);
2040         if (!sb->s_root) {
2041                 udf_err(sb, "Couldn't allocate root dentry\n");
2042                 iput(inode);
2043                 goto error_out;
2044         }
2045         sb->s_maxbytes = MAX_LFS_FILESIZE;
2046         return 0;
2047
2048 error_out:
2049         if (sbi->s_vat_inode)
2050                 iput(sbi->s_vat_inode);
2051         if (sbi->s_partitions)
2052                 for (i = 0; i < sbi->s_partitions; i++)
2053                         udf_free_partition(&sbi->s_partmaps[i]);
2054 #ifdef CONFIG_UDF_NLS
2055         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2056                 unload_nls(sbi->s_nls_map);
2057 #endif
2058         if (!(sb->s_flags & MS_RDONLY))
2059                 udf_close_lvid(sb);
2060         brelse(sbi->s_lvid_bh);
2061
2062         kfree(sbi->s_partmaps);
2063         kfree(sbi);
2064         sb->s_fs_info = NULL;
2065
2066         return -EINVAL;
2067 }
2068
2069 void _udf_err(struct super_block *sb, const char *function,
2070               const char *fmt, ...)
2071 {
2072         struct va_format vaf;
2073         va_list args;
2074
2075         /* mark sb error */
2076         if (!(sb->s_flags & MS_RDONLY))
2077                 sb->s_dirt = 1;
2078
2079         va_start(args, fmt);
2080
2081         vaf.fmt = fmt;
2082         vaf.va = &args;
2083
2084         pr_err("error (device %s): %s: %pV", sb->s_id, function, &vaf);
2085
2086         va_end(args);
2087 }
2088
2089 void _udf_warn(struct super_block *sb, const char *function,
2090                const char *fmt, ...)
2091 {
2092         struct va_format vaf;
2093         va_list args;
2094
2095         va_start(args, fmt);
2096
2097         vaf.fmt = fmt;
2098         vaf.va = &args;
2099
2100         pr_warn("warning (device %s): %s: %pV", sb->s_id, function, &vaf);
2101
2102         va_end(args);
2103 }
2104
2105 static void udf_put_super(struct super_block *sb)
2106 {
2107         int i;
2108         struct udf_sb_info *sbi;
2109
2110         sbi = UDF_SB(sb);
2111
2112         if (sbi->s_vat_inode)
2113                 iput(sbi->s_vat_inode);
2114         if (sbi->s_partitions)
2115                 for (i = 0; i < sbi->s_partitions; i++)
2116                         udf_free_partition(&sbi->s_partmaps[i]);
2117 #ifdef CONFIG_UDF_NLS
2118         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2119                 unload_nls(sbi->s_nls_map);
2120 #endif
2121         if (!(sb->s_flags & MS_RDONLY))
2122                 udf_close_lvid(sb);
2123         brelse(sbi->s_lvid_bh);
2124         kfree(sbi->s_partmaps);
2125         kfree(sb->s_fs_info);
2126         sb->s_fs_info = NULL;
2127 }
2128
2129 static int udf_sync_fs(struct super_block *sb, int wait)
2130 {
2131         struct udf_sb_info *sbi = UDF_SB(sb);
2132
2133         mutex_lock(&sbi->s_alloc_mutex);
2134         if (sbi->s_lvid_dirty) {
2135                 /*
2136                  * Blockdevice will be synced later so we don't have to submit
2137                  * the buffer for IO
2138                  */
2139                 mark_buffer_dirty(sbi->s_lvid_bh);
2140                 sb->s_dirt = 0;
2141                 sbi->s_lvid_dirty = 0;
2142         }
2143         mutex_unlock(&sbi->s_alloc_mutex);
2144
2145         return 0;
2146 }
2147
2148 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
2149 {
2150         struct super_block *sb = dentry->d_sb;
2151         struct udf_sb_info *sbi = UDF_SB(sb);
2152         struct logicalVolIntegrityDescImpUse *lvidiu;
2153         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
2154
2155         if (sbi->s_lvid_bh != NULL)
2156                 lvidiu = udf_sb_lvidiu(sbi);
2157         else
2158                 lvidiu = NULL;
2159
2160         buf->f_type = UDF_SUPER_MAGIC;
2161         buf->f_bsize = sb->s_blocksize;
2162         buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
2163         buf->f_bfree = udf_count_free(sb);
2164         buf->f_bavail = buf->f_bfree;
2165         buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2166                                           le32_to_cpu(lvidiu->numDirs)) : 0)
2167                         + buf->f_bfree;
2168         buf->f_ffree = buf->f_bfree;
2169         buf->f_namelen = UDF_NAME_LEN - 2;
2170         buf->f_fsid.val[0] = (u32)id;
2171         buf->f_fsid.val[1] = (u32)(id >> 32);
2172
2173         return 0;
2174 }
2175
2176 static unsigned int udf_count_free_bitmap(struct super_block *sb,
2177                                           struct udf_bitmap *bitmap)
2178 {
2179         struct buffer_head *bh = NULL;
2180         unsigned int accum = 0;
2181         int index;
2182         int block = 0, newblock;
2183         struct kernel_lb_addr loc;
2184         uint32_t bytes;
2185         uint8_t *ptr;
2186         uint16_t ident;
2187         struct spaceBitmapDesc *bm;
2188
2189         loc.logicalBlockNum = bitmap->s_extPosition;
2190         loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
2191         bh = udf_read_ptagged(sb, &loc, 0, &ident);
2192
2193         if (!bh) {
2194                 udf_err(sb, "udf_count_free failed\n");
2195                 goto out;
2196         } else if (ident != TAG_IDENT_SBD) {
2197                 brelse(bh);
2198                 udf_err(sb, "udf_count_free failed\n");
2199                 goto out;
2200         }
2201
2202         bm = (struct spaceBitmapDesc *)bh->b_data;
2203         bytes = le32_to_cpu(bm->numOfBytes);
2204         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2205         ptr = (uint8_t *)bh->b_data;
2206
2207         while (bytes > 0) {
2208                 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2209                 accum += bitmap_weight((const unsigned long *)(ptr + index),
2210                                         cur_bytes * 8);
2211                 bytes -= cur_bytes;
2212                 if (bytes) {
2213                         brelse(bh);
2214                         newblock = udf_get_lb_pblock(sb, &loc, ++block);
2215                         bh = udf_tread(sb, newblock);
2216                         if (!bh) {
2217                                 udf_debug("read failed\n");
2218                                 goto out;
2219                         }
2220                         index = 0;
2221                         ptr = (uint8_t *)bh->b_data;
2222                 }
2223         }
2224         brelse(bh);
2225 out:
2226         return accum;
2227 }
2228
2229 static unsigned int udf_count_free_table(struct super_block *sb,
2230                                          struct inode *table)
2231 {
2232         unsigned int accum = 0;
2233         uint32_t elen;
2234         struct kernel_lb_addr eloc;
2235         int8_t etype;
2236         struct extent_position epos;
2237
2238         mutex_lock(&UDF_SB(sb)->s_alloc_mutex);
2239         epos.block = UDF_I(table)->i_location;
2240         epos.offset = sizeof(struct unallocSpaceEntry);
2241         epos.bh = NULL;
2242
2243         while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2244                 accum += (elen >> table->i_sb->s_blocksize_bits);
2245
2246         brelse(epos.bh);
2247         mutex_unlock(&UDF_SB(sb)->s_alloc_mutex);
2248
2249         return accum;
2250 }
2251
2252 static unsigned int udf_count_free(struct super_block *sb)
2253 {
2254         unsigned int accum = 0;
2255         struct udf_sb_info *sbi;
2256         struct udf_part_map *map;
2257
2258         sbi = UDF_SB(sb);
2259         if (sbi->s_lvid_bh) {
2260                 struct logicalVolIntegrityDesc *lvid =
2261                         (struct logicalVolIntegrityDesc *)
2262                         sbi->s_lvid_bh->b_data;
2263                 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
2264                         accum = le32_to_cpu(
2265                                         lvid->freeSpaceTable[sbi->s_partition]);
2266                         if (accum == 0xFFFFFFFF)
2267                                 accum = 0;
2268                 }
2269         }
2270
2271         if (accum)
2272                 return accum;
2273
2274         map = &sbi->s_partmaps[sbi->s_partition];
2275         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2276                 accum += udf_count_free_bitmap(sb,
2277                                                map->s_uspace.s_bitmap);
2278         }
2279         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
2280                 accum += udf_count_free_bitmap(sb,
2281                                                map->s_fspace.s_bitmap);
2282         }
2283         if (accum)
2284                 return accum;
2285
2286         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2287                 accum += udf_count_free_table(sb,
2288                                               map->s_uspace.s_table);
2289         }
2290         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
2291                 accum += udf_count_free_table(sb,
2292                                               map->s_fspace.s_table);
2293         }
2294
2295         return accum;
2296 }