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   1 /*
   2  * super.c
   3  *
   4  * PURPOSE
   5  *  Super block routines for the OSTA-UDF(tm) filesystem.
   6  *
   7  * DESCRIPTION
   8  *  OSTA-UDF(tm) = Optical Storage Technology Association
   9  *  Universal Disk Format.
  10  *
  11  *  This code is based on version 2.00 of the UDF specification,
  12  *  and revision 3 of the ECMA 167 standard [equivalent to ISO 13346].
  13  *    http://www.osta.org/
  14  *    http://www.ecma.ch/
  15  *    http://www.iso.org/
  16  *
  17  * COPYRIGHT
  18  *  This file is distributed under the terms of the GNU General Public
  19  *  License (GPL). Copies of the GPL can be obtained from:
  20  *    ftp://prep.ai.mit.edu/pub/gnu/GPL
  21  *  Each contributing author retains all rights to their own work.
  22  *
  23  *  (C) 1998 Dave Boynton
  24  *  (C) 1998-2004 Ben Fennema
  25  *  (C) 2000 Stelias Computing Inc
  26  *
  27  * HISTORY
  28  *
  29  *  09/24/98 dgb  changed to allow compiling outside of kernel, and
  30  *                added some debugging.
  31  *  10/01/98 dgb  updated to allow (some) possibility of compiling w/2.0.34
  32  *  10/16/98      attempting some multi-session support
  33  *  10/17/98      added freespace count for "df"
  34  *  11/11/98 gr   added novrs option
  35  *  11/26/98 dgb  added fileset,anchor mount options
  36  *  12/06/98 blf  really hosed things royally. vat/sparing support. sequenced
  37  *                vol descs. rewrote option handling based on isofs
  38  *  12/20/98      find the free space bitmap (if it exists)
  39  */
  40
  41 #include "udfdecl.h"
  42
  43 #include <linux/blkdev.h>
  44 #include <linux/slab.h>
  45 #include <linux/kernel.h>
  46 #include <linux/module.h>
  47 #include <linux/parser.h>
  48 #include <linux/stat.h>
  49 #include <linux/cdrom.h>
  50 #include <linux/nls.h>
  51 #include <linux/smp_lock.h>
  52 #include <linux/buffer_head.h>
  53 #include <linux/vfs.h>
  54 #include <linux/vmalloc.h>
  55 #include <linux/errno.h>
  56 #include <linux/mount.h>
  57 #include <linux/seq_file.h>
  58 #include <linux/bitmap.h>
  59 #include <linux/crc-itu-t.h>
  60 #include <asm/byteorder.h>
  61
  62 #include "udf_sb.h"
  63 #include "udf_i.h"
  64
  65 #include <linux/init.h>
  66 #include <asm/uaccess.h>
  67
  68 #define VDS_POS_PRIMARY_VOL_DESC        0
  69 #define VDS_POS_UNALLOC_SPACE_DESC      1
  70 #define VDS_POS_LOGICAL_VOL_DESC        2
  71 #define VDS_POS_PARTITION_DESC          3
  72 #define VDS_POS_IMP_USE_VOL_DESC        4
  73 #define VDS_POS_VOL_DESC_PTR            5
  74 #define VDS_POS_TERMINATING_DESC        6
  75 #define VDS_POS_LENGTH                  7
  76
  77 #define UDF_DEFAULT_BLOCKSIZE 2048
  78
  79 static char error_buf[1024];
  80
  81 /* These are the "meat" - everything else is stuffing */
  82 static int udf_fill_super(struct super_block *, void *, int);
  83 static void udf_put_super(struct super_block *);
  84 static void udf_write_super(struct super_block *);
  85 static int udf_remount_fs(struct super_block *, int *, char *);
  86 static int udf_check_valid(struct super_block *, int, int);
  87 static int udf_vrs(struct super_block *sb, int silent);
  88 static void udf_load_logicalvolint(struct super_block *, struct kernel_extent_ad);
  89 static void udf_find_anchor(struct super_block *);
  90 static int udf_find_fileset(struct super_block *, struct kernel_lb_addr *,
  91                             struct kernel_lb_addr *);
  92 static void udf_load_fileset(struct super_block *, struct buffer_head *,
  93                              struct kernel_lb_addr *);
  94 static void udf_open_lvid(struct super_block *);
  95 static void udf_close_lvid(struct super_block *);
  96 static unsigned int udf_count_free(struct super_block *);
  97 static int udf_statfs(struct dentry *, struct kstatfs *);
  98 static int udf_show_options(struct seq_file *, struct vfsmount *);
  99 static void udf_error(struct super_block *sb, const char *function,
 100                       const char *fmt, ...);
 101
 102 struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct udf_sb_info *sbi)
 103 {
 104         struct logicalVolIntegrityDesc *lvid =
 105                 (struct logicalVolIntegrityDesc *)sbi->s_lvid_bh->b_data;
 106         __u32 number_of_partitions = le32_to_cpu(lvid->numOfPartitions);
 107         __u32 offset = number_of_partitions * 2 *
 108                                 sizeof(uint32_t)/sizeof(uint8_t);
 109         return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
 110 }
 111
 112 /* UDF filesystem type */
 113 static int udf_get_sb(struct file_system_type *fs_type,
 114                       int flags, const char *dev_name, void *data,
 115                       struct vfsmount *mnt)
 116 {
 117         return get_sb_bdev(fs_type, flags, dev_name, data, udf_fill_super, mnt);
 118 }
 119
 120 static struct file_system_type udf_fstype = {
 121         .owner          = THIS_MODULE,
 122         .name           = "udf",
 123         .get_sb         = udf_get_sb,
 124         .kill_sb        = kill_block_super,
 125         .fs_flags       = FS_REQUIRES_DEV,
 126 };
 127
 128 static struct kmem_cache *udf_inode_cachep;
 129
 130 static struct inode *udf_alloc_inode(struct super_block *sb)
 131 {
 132         struct udf_inode_info *ei;
 133         ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
 134         if (!ei)
 135                 return NULL;
 136
 137         ei->i_unique = 0;
 138         ei->i_lenExtents = 0;
 139         ei->i_next_alloc_block = 0;
 140         ei->i_next_alloc_goal = 0;
 141         ei->i_strat4096 = 0;
 142
 143         return &ei->vfs_inode;
 144 }
 145
 146 static void udf_destroy_inode(struct inode *inode)
 147 {
 148         kmem_cache_free(udf_inode_cachep, UDF_I(inode));
 149 }
 150
 151 static void init_once(void *foo)
 152 {
 153         struct udf_inode_info *ei = (struct udf_inode_info *)foo;
 154
 155         ei->i_ext.i_data = NULL;
 156         inode_init_once(&ei->vfs_inode);
 157 }
 158
 159 static int init_inodecache(void)
 160 {
 161         udf_inode_cachep = kmem_cache_create("udf_inode_cache",
 162                                              sizeof(struct udf_inode_info),
 163                                              0, (SLAB_RECLAIM_ACCOUNT |
 164                                                  SLAB_MEM_SPREAD),
 165                                              init_once);
 166         if (!udf_inode_cachep)
 167                 return -ENOMEM;
 168         return 0;
 169 }
 170
 171 static void destroy_inodecache(void)
 172 {
 173         kmem_cache_destroy(udf_inode_cachep);
 174 }
 175
 176 /* Superblock operations */
 177 static const struct super_operations udf_sb_ops = {
 178         .alloc_inode    = udf_alloc_inode,
 179         .destroy_inode  = udf_destroy_inode,
 180         .write_inode    = udf_write_inode,
 181         .delete_inode   = udf_delete_inode,
 182         .clear_inode    = udf_clear_inode,
 183         .put_super      = udf_put_super,
 184         .write_super    = udf_write_super,
 185         .statfs         = udf_statfs,
 186         .remount_fs     = udf_remount_fs,
 187         .show_options   = udf_show_options,
 188 };
 189
 190 struct udf_options {
 191         unsigned char novrs;
 192         unsigned int blocksize;
 193         unsigned int session;
 194         unsigned int lastblock;
 195         unsigned int anchor;
 196         unsigned int volume;
 197         unsigned short partition;
 198         unsigned int fileset;
 199         unsigned int rootdir;
 200         unsigned int flags;
 201         mode_t umask;
 202         gid_t gid;
 203         uid_t uid;
 204         mode_t fmode;
 205         mode_t dmode;
 206         struct nls_table *nls_map;
 207 };
 208
 209 static int __init init_udf_fs(void)
 210 {
 211         int err;
 212
 213         err = init_inodecache();
 214         if (err)
 215                 goto out1;
 216         err = register_filesystem(&udf_fstype);
 217         if (err)
 218                 goto out;
 219
 220         return 0;
 221
 222 out:
 223         destroy_inodecache();
 224
 225 out1:
 226         return err;
 227 }
 228
 229 static void __exit exit_udf_fs(void)
 230 {
 231         unregister_filesystem(&udf_fstype);
 232         destroy_inodecache();
 233 }
 234
 235 module_init(init_udf_fs)
 236 module_exit(exit_udf_fs)
 237
 238 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
 239 {
 240         struct udf_sb_info *sbi = UDF_SB(sb);
 241
 242         sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map),
 243                                   GFP_KERNEL);
 244         if (!sbi->s_partmaps) {
 245                 udf_error(sb, __func__,
 246                           "Unable to allocate space for %d partition maps",
 247                           count);
 248                 sbi->s_partitions = 0;
 249                 return -ENOMEM;
 250         }
 251
 252         sbi->s_partitions = count;
 253         return 0;
 254 }
 255
 256 static int udf_show_options(struct seq_file *seq, struct vfsmount *mnt)
 257 {
 258         struct super_block *sb = mnt->mnt_sb;
 259         struct udf_sb_info *sbi = UDF_SB(sb);
 260
 261         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
 262                 seq_puts(seq, ",nostrict");
 263         if (sb->s_blocksize != UDF_DEFAULT_BLOCKSIZE)
 264                 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
 265         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
 266                 seq_puts(seq, ",unhide");
 267         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
 268                 seq_puts(seq, ",undelete");
 269         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
 270                 seq_puts(seq, ",noadinicb");
 271         if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
 272                 seq_puts(seq, ",shortad");
 273         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
 274                 seq_puts(seq, ",uid=forget");
 275         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_IGNORE))
 276                 seq_puts(seq, ",uid=ignore");
 277         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
 278                 seq_puts(seq, ",gid=forget");
 279         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE))
 280                 seq_puts(seq, ",gid=ignore");
 281         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
 282                 seq_printf(seq, ",uid=%u", sbi->s_uid);
 283         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
 284                 seq_printf(seq, ",gid=%u", sbi->s_gid);
 285         if (sbi->s_umask != 0)
 286                 seq_printf(seq, ",umask=%o", sbi->s_umask);
 287         if (sbi->s_fmode != UDF_INVALID_MODE)
 288                 seq_printf(seq, ",mode=%o", sbi->s_fmode);
 289         if (sbi->s_dmode != UDF_INVALID_MODE)
 290                 seq_printf(seq, ",dmode=%o", sbi->s_dmode);
 291         if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
 292                 seq_printf(seq, ",session=%u", sbi->s_session);
 293         if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
 294                 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
 295         /*
 296          * s_anchor[2] could be zeroed out in case there is no anchor
 297          * in the specified block, but then the "anchor=N" option
 298          * originally given by the user wasn't effective, so it's OK
 299          * if we don't show it.
 300          */
 301         if (sbi->s_anchor[2] != 0)
 302                 seq_printf(seq, ",anchor=%u", sbi->s_anchor[2]);
 303         /*
 304          * volume, partition, fileset and rootdir seem to be ignored
 305          * currently
 306          */
 307         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
 308                 seq_puts(seq, ",utf8");
 309         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
 310                 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
 311
 312         return 0;
 313 }
 314
 315 /*
 316  * udf_parse_options
 317  *
 318  * PURPOSE
 319  *      Parse mount options.
 320  *
 321  * DESCRIPTION
 322  *      The following mount options are supported:
 323  *
 324  *      gid=            Set the default group.
 325  *      umask=          Set the default umask.
 326  *      mode=           Set the default file permissions.
 327  *      dmode=          Set the default directory permissions.
 328  *      uid=            Set the default user.
 329  *      bs=             Set the block size.
 330  *      unhide          Show otherwise hidden files.
 331  *      undelete        Show deleted files in lists.
 332  *      adinicb         Embed data in the inode (default)
 333  *      noadinicb       Don't embed data in the inode
 334  *      shortad         Use short ad's
 335  *      longad          Use long ad's (default)
 336  *      nostrict        Unset strict conformance
 337  *      iocharset=      Set the NLS character set
 338  *
 339  *      The remaining are for debugging and disaster recovery:
 340  *
 341  *      novrs           Skip volume sequence recognition
 342  *
 343  *      The following expect a offset from 0.
 344  *
 345  *      session=        Set the CDROM session (default= last session)
 346  *      anchor=         Override standard anchor location. (default= 256)
 347  *      volume=         Override the VolumeDesc location. (unused)
 348  *      partition=      Override the PartitionDesc location. (unused)
 349  *      lastblock=      Set the last block of the filesystem/
 350  *
 351  *      The following expect a offset from the partition root.
 352  *
 353  *      fileset=        Override the fileset block location. (unused)
 354  *      rootdir=        Override the root directory location. (unused)
 355  *              WARNING: overriding the rootdir to a non-directory may
 356  *              yield highly unpredictable results.
 357  *
 358  * PRE-CONDITIONS
 359  *      options         Pointer to mount options string.
 360  *      uopts           Pointer to mount options variable.
 361  *
 362  * POST-CONDITIONS
 363  *      <return>        1       Mount options parsed okay.
 364  *      <return>        0       Error parsing mount options.
 365  *
 366  * HISTORY
 367  *      July 1, 1997 - Andrew E. Mileski
 368  *      Written, tested, and released.
 369  */
 370
 371 enum {
 372         Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
 373         Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
 374         Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
 375         Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
 376         Opt_rootdir, Opt_utf8, Opt_iocharset,
 377         Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore,
 378         Opt_fmode, Opt_dmode
 379 };
 380
 381 static const match_table_t tokens = {
 382         {Opt_novrs,     "novrs"},
 383         {Opt_nostrict,  "nostrict"},
 384         {Opt_bs,        "bs=%u"},
 385         {Opt_unhide,    "unhide"},
 386         {Opt_undelete,  "undelete"},
 387         {Opt_noadinicb, "noadinicb"},
 388         {Opt_adinicb,   "adinicb"},
 389         {Opt_shortad,   "shortad"},
 390         {Opt_longad,    "longad"},
 391         {Opt_uforget,   "uid=forget"},
 392         {Opt_uignore,   "uid=ignore"},
 393         {Opt_gforget,   "gid=forget"},
 394         {Opt_gignore,   "gid=ignore"},
 395         {Opt_gid,       "gid=%u"},
 396         {Opt_uid,       "uid=%u"},
 397         {Opt_umask,     "umask=%o"},
 398         {Opt_session,   "session=%u"},
 399         {Opt_lastblock, "lastblock=%u"},
 400         {Opt_anchor,    "anchor=%u"},
 401         {Opt_volume,    "volume=%u"},
 402         {Opt_partition, "partition=%u"},
 403         {Opt_fileset,   "fileset=%u"},
 404         {Opt_rootdir,   "rootdir=%u"},
 405         {Opt_utf8,      "utf8"},
 406         {Opt_iocharset, "iocharset=%s"},
 407         {Opt_fmode,     "mode=%o"},
 408         {Opt_dmode,     "dmode=%o"},
 409         {Opt_err,       NULL}
 410 };
 411
 412 static int udf_parse_options(char *options, struct udf_options *uopt,
 413                              bool remount)
 414 {
 415         char *p;
 416         int option;
 417
 418         uopt->novrs = 0;
 419         uopt->blocksize = UDF_DEFAULT_BLOCKSIZE;
 420         uopt->partition = 0xFFFF;
 421         uopt->session = 0xFFFFFFFF;
 422         uopt->lastblock = 0;
 423         uopt->anchor = 0;
 424         uopt->volume = 0xFFFFFFFF;
 425         uopt->rootdir = 0xFFFFFFFF;
 426         uopt->fileset = 0xFFFFFFFF;
 427         uopt->nls_map = NULL;
 428
 429         if (!options)
 430                 return 1;
 431
 432         while ((p = strsep(&options, ",")) != NULL) {
 433                 substring_t args[MAX_OPT_ARGS];
 434                 int token;
 435                 if (!*p)
 436                         continue;
 437
 438                 token = match_token(p, tokens, args);
 439                 switch (token) {
 440                 case Opt_novrs:
 441                         uopt->novrs = 1;
 442                 case Opt_bs:
 443                         if (match_int(&args[0], &option))
 444                                 return 0;
 445                         uopt->blocksize = option;
 446                         break;
 447                 case Opt_unhide:
 448                         uopt->flags |= (1 << UDF_FLAG_UNHIDE);
 449                         break;
 450                 case Opt_undelete:
 451                         uopt->flags |= (1 << UDF_FLAG_UNDELETE);
 452                         break;
 453                 case Opt_noadinicb:
 454                         uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
 455                         break;
 456                 case Opt_adinicb:
 457                         uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
 458                         break;
 459                 case Opt_shortad:
 460                         uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
 461                         break;
 462                 case Opt_longad:
 463                         uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
 464                         break;
 465                 case Opt_gid:
 466                         if (match_int(args, &option))
 467                                 return 0;
 468                         uopt->gid = option;
 469                         uopt->flags |= (1 << UDF_FLAG_GID_SET);
 470                         break;
 471                 case Opt_uid:
 472                         if (match_int(args, &option))
 473                                 return 0;
 474                         uopt->uid = option;
 475                         uopt->flags |= (1 << UDF_FLAG_UID_SET);
 476                         break;
 477                 case Opt_umask:
 478                         if (match_octal(args, &option))
 479                                 return 0;
 480                         uopt->umask = option;
 481                         break;
 482                 case Opt_nostrict:
 483                         uopt->flags &= ~(1 << UDF_FLAG_STRICT);
 484                         break;
 485                 case Opt_session:
 486                         if (match_int(args, &option))
 487                                 return 0;
 488                         uopt->session = option;
 489                         if (!remount)
 490                                 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
 491                         break;
 492                 case Opt_lastblock:
 493                         if (match_int(args, &option))
 494                                 return 0;
 495                         uopt->lastblock = option;
 496                         if (!remount)
 497                                 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
 498                         break;
 499                 case Opt_anchor:
 500                         if (match_int(args, &option))
 501                                 return 0;
 502                         uopt->anchor = option;
 503                         break;
 504                 case Opt_volume:
 505                         if (match_int(args, &option))
 506                                 return 0;
 507                         uopt->volume = option;
 508                         break;
 509                 case Opt_partition:
 510                         if (match_int(args, &option))
 511                                 return 0;
 512                         uopt->partition = option;
 513                         break;
 514                 case Opt_fileset:
 515                         if (match_int(args, &option))
 516                                 return 0;
 517                         uopt->fileset = option;
 518                         break;
 519                 case Opt_rootdir:
 520                         if (match_int(args, &option))
 521                                 return 0;
 522                         uopt->rootdir = option;
 523                         break;
 524                 case Opt_utf8:
 525                         uopt->flags |= (1 << UDF_FLAG_UTF8);
 526                         break;
 527 #ifdef CONFIG_UDF_NLS
 528                 case Opt_iocharset:
 529                         uopt->nls_map = load_nls(args[0].from);
 530                         uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
 531                         break;
 532 #endif
 533                 case Opt_uignore:
 534                         uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
 535                         break;
 536                 case Opt_uforget:
 537                         uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
 538                         break;
 539                 case Opt_gignore:
 540                         uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
 541                         break;
 542                 case Opt_gforget:
 543                         uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
 544                         break;
 545                 case Opt_fmode:
 546                         if (match_octal(args, &option))
 547                                 return 0;
 548                         uopt->fmode = option & 0777;
 549                         break;
 550                 case Opt_dmode:
 551                         if (match_octal(args, &option))
 552                                 return 0;
 553                         uopt->dmode = option & 0777;
 554                         break;
 555                 default:
 556                         printk(KERN_ERR "udf: bad mount option \"%s\" "
 557                                "or missing value\n", p);
 558                         return 0;
 559                 }
 560         }
 561         return 1;
 562 }
 563
 564 static void udf_write_super(struct super_block *sb)
 565 {
 566         lock_kernel();
 567
 568         if (!(sb->s_flags & MS_RDONLY))
 569                 udf_open_lvid(sb);
 570         sb->s_dirt = 0;
 571
 572         unlock_kernel();
 573 }
 574
 575 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
 576 {
 577         struct udf_options uopt;
 578         struct udf_sb_info *sbi = UDF_SB(sb);
 579
 580         uopt.flags = sbi->s_flags;
 581         uopt.uid   = sbi->s_uid;
 582         uopt.gid   = sbi->s_gid;
 583         uopt.umask = sbi->s_umask;
 584         uopt.fmode = sbi->s_fmode;
 585         uopt.dmode = sbi->s_dmode;
 586
 587         if (!udf_parse_options(options, &uopt, true))
 588                 return -EINVAL;
 589
 590         sbi->s_flags = uopt.flags;
 591         sbi->s_uid   = uopt.uid;
 592         sbi->s_gid   = uopt.gid;
 593         sbi->s_umask = uopt.umask;
 594         sbi->s_fmode = uopt.fmode;
 595         sbi->s_dmode = uopt.dmode;
 596
 597         if (sbi->s_lvid_bh) {
 598                 int write_rev = le16_to_cpu(udf_sb_lvidiu(sbi)->minUDFWriteRev);
 599                 if (write_rev > UDF_MAX_WRITE_VERSION)
 600                         *flags |= MS_RDONLY;
 601         }
 602
 603         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 604                 return 0;
 605         if (*flags & MS_RDONLY)
 606                 udf_close_lvid(sb);
 607         else
 608                 udf_open_lvid(sb);
 609
 610         return 0;
 611 }
 612
 613 static int udf_vrs(struct super_block *sb, int silent)
 614 {
 615         struct volStructDesc *vsd = NULL;
 616         loff_t sector = 32768;
 617         int sectorsize;
 618         struct buffer_head *bh = NULL;
 619         int iso9660 = 0;
 620         int nsr02 = 0;
 621         int nsr03 = 0;
 622         struct udf_sb_info *sbi;
 623
 624         /* Block size must be a multiple of 512 */
 625         if (sb->s_blocksize & 511)
 626                 return 0;
 627         sbi = UDF_SB(sb);
 628
 629         if (sb->s_blocksize < sizeof(struct volStructDesc))
 630                 sectorsize = sizeof(struct volStructDesc);
 631         else
 632                 sectorsize = sb->s_blocksize;
 633
 634         sector += (sbi->s_session << sb->s_blocksize_bits);
 635
 636         udf_debug("Starting at sector %u (%ld byte sectors)\n",
 637                   (unsigned int)(sector >> sb->s_blocksize_bits),
 638                   sb->s_blocksize);
 639         /* Process the sequence (if applicable) */
 640         for (; !nsr02 && !nsr03; sector += sectorsize) {
 641                 /* Read a block */
 642                 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
 643                 if (!bh)
 644                         break;
 645
 646                 /* Look for ISO  descriptors */
 647                 vsd = (struct volStructDesc *)(bh->b_data +
 648                                               (sector & (sb->s_blocksize - 1)));
 649
 650                 if (vsd->stdIdent[0] == 0) {
 651                         brelse(bh);
 652                         break;
 653                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
 654                                     VSD_STD_ID_LEN)) {
 655                         iso9660 = sector;
 656                         switch (vsd->structType) {
 657                         case 0:
 658                                 udf_debug("ISO9660 Boot Record found\n");
 659                                 break;
 660                         case 1:
 661                                 udf_debug("ISO9660 Primary Volume Descriptor "
 662                                           "found\n");
 663                                 break;
 664                         case 2:
 665                                 udf_debug("ISO9660 Supplementary Volume "
 666                                           "Descriptor found\n");
 667                                 break;
 668                         case 3:
 669                                 udf_debug("ISO9660 Volume Partition Descriptor "
 670                                           "found\n");
 671                                 break;
 672                         case 255:
 673                                 udf_debug("ISO9660 Volume Descriptor Set "
 674                                           "Terminator found\n");
 675                                 break;
 676                         default:
 677                                 udf_debug("ISO9660 VRS (%u) found\n",
 678                                           vsd->structType);
 679                                 break;
 680                         }
 681                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
 682                                     VSD_STD_ID_LEN))
 683                         ; /* nothing */
 684                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
 685                                     VSD_STD_ID_LEN)) {
 686                         brelse(bh);
 687                         break;
 688                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
 689                                     VSD_STD_ID_LEN))
 690                         nsr02 = sector;
 691                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
 692                                     VSD_STD_ID_LEN))
 693                         nsr03 = sector;
 694                 brelse(bh);
 695         }
 696
 697         if (nsr03)
 698                 return nsr03;
 699         else if (nsr02)
 700                 return nsr02;
 701         else if (sector - (sbi->s_session << sb->s_blocksize_bits) == 32768)
 702                 return -1;
 703         else
 704                 return 0;
 705 }
 706
 707 /*
 708  * Check whether there is an anchor block in the given block
 709  */
 710 static int udf_check_anchor_block(struct super_block *sb, sector_t block)
 711 {
 712         struct buffer_head *bh;
 713         uint16_t ident;
 714
 715         if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
 716             udf_fixed_to_variable(block) >=
 717             sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits)
 718                 return 0;
 719
 720         bh = udf_read_tagged(sb, block, block, &ident);
 721         if (!bh)
 722                 return 0;
 723         brelse(bh);
 724
 725         return ident == TAG_IDENT_AVDP;
 726 }
 727
 728 /* Search for an anchor volume descriptor pointer */
 729 static sector_t udf_scan_anchors(struct super_block *sb, sector_t lastblock)
 730 {
 731         sector_t last[6];
 732         int i;
 733         struct udf_sb_info *sbi = UDF_SB(sb);
 734         int last_count = 0;
 735
 736         last[last_count++] = lastblock;
 737         if (lastblock >= 1)
 738                 last[last_count++] = lastblock - 1;
 739         last[last_count++] = lastblock + 1;
 740         if (lastblock >= 2)
 741                 last[last_count++] = lastblock - 2;
 742         if (lastblock >= 150)
 743                 last[last_count++] = lastblock - 150;
 744         if (lastblock >= 152)
 745                 last[last_count++] = lastblock - 152;
 746
 747         /*  according to spec, anchor is in either:
 748          *     block 256
 749          *     lastblock-256
 750          *     lastblock
 751          *  however, if the disc isn't closed, it could be 512 */
 752
 753         for (i = 0; i < last_count; i++) {
 754                 if (last[i] >= sb->s_bdev->bd_inode->i_size >>
 755                                 sb->s_blocksize_bits)
 756                         continue;
 757
 758                 if (udf_check_anchor_block(sb, last[i])) {
 759                         sbi->s_anchor[0] = last[i];
 760                         sbi->s_anchor[1] = last[i] - 256;
 761                         return last[i];
 762                 }
 763
 764                 if (last[i] < 256)
 765                         continue;
 766
 767                 if (udf_check_anchor_block(sb, last[i] - 256)) {
 768                         sbi->s_anchor[1] = last[i] - 256;
 769                         return last[i];
 770                 }
 771         }
 772
 773         if (udf_check_anchor_block(sb, sbi->s_session + 256)) {
 774                 sbi->s_anchor[0] = sbi->s_session + 256;
 775                 return last[0];
 776         }
 777         if (udf_check_anchor_block(sb, sbi->s_session + 512)) {
 778                 sbi->s_anchor[0] = sbi->s_session + 512;
 779                 return last[0];
 780         }
 781         return 0;
 782 }
 783
 784 /*
 785  * Find an anchor volume descriptor. The function expects sbi->s_lastblock to
 786  * be the last block on the media.
 787  *
 788  * Return 1 if not found, 0 if ok
 789  *
 790  */
 791 static void udf_find_anchor(struct super_block *sb)
 792 {
 793         sector_t lastblock;
 794         struct buffer_head *bh = NULL;
 795         uint16_t ident;
 796         int i;
 797         struct udf_sb_info *sbi = UDF_SB(sb);
 798
 799         lastblock = udf_scan_anchors(sb, sbi->s_last_block);
 800         if (lastblock)
 801                 goto check_anchor;
 802
 803         /* No anchor found? Try VARCONV conversion of block numbers */
 804         UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
 805         /* Firstly, we try to not convert number of the last block */
 806         lastblock = udf_scan_anchors(sb,
 807                                 udf_variable_to_fixed(sbi->s_last_block));
 808         if (lastblock)
 809                 goto check_anchor;
 810
 811         /* Secondly, we try with converted number of the last block */
 812         lastblock = udf_scan_anchors(sb, sbi->s_last_block);
 813         if (!lastblock) {
 814                 /* VARCONV didn't help. Clear it. */
 815                 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
 816         }
 817
 818 check_anchor:
 819         /*
 820          * Check located anchors and the anchor block supplied via
 821          * mount options
 822          */
 823         for (i = 0; i < ARRAY_SIZE(sbi->s_anchor); i++) {
 824                 if (!sbi->s_anchor[i])
 825                         continue;
 826                 bh = udf_read_tagged(sb, sbi->s_anchor[i],
 827                                         sbi->s_anchor[i], &ident);
 828                 if (!bh)
 829                         sbi->s_anchor[i] = 0;
 830                 else {
 831                         brelse(bh);
 832                         if (ident != TAG_IDENT_AVDP)
 833                                 sbi->s_anchor[i] = 0;
 834                 }
 835         }
 836
 837         sbi->s_last_block = lastblock;
 838 }
 839
 840 static int udf_find_fileset(struct super_block *sb,
 841                             struct kernel_lb_addr *fileset,
 842                             struct kernel_lb_addr *root)
 843 {
 844         struct buffer_head *bh = NULL;
 845         long lastblock;
 846         uint16_t ident;
 847         struct udf_sb_info *sbi;
 848
 849         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
 850             fileset->partitionReferenceNum != 0xFFFF) {
 851                 bh = udf_read_ptagged(sb, fileset, 0, &ident);
 852
 853                 if (!bh) {
 854                         return 1;
 855                 } else if (ident != TAG_IDENT_FSD) {
 856                         brelse(bh);
 857                         return 1;
 858                 }
 859
 860         }
 861
 862         sbi = UDF_SB(sb);
 863         if (!bh) {
 864                 /* Search backwards through the partitions */
 865                 struct kernel_lb_addr newfileset;
 866
 867 /* --> cvg: FIXME - is it reasonable? */
 868                 return 1;
 869
 870                 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
 871                      (newfileset.partitionReferenceNum != 0xFFFF &&
 872                       fileset->logicalBlockNum == 0xFFFFFFFF &&
 873                       fileset->partitionReferenceNum == 0xFFFF);
 874                      newfileset.partitionReferenceNum--) {
 875                         lastblock = sbi->s_partmaps
 876                                         [newfileset.partitionReferenceNum]
 877                                                 .s_partition_len;
 878                         newfileset.logicalBlockNum = 0;
 879
 880                         do {
 881                                 bh = udf_read_ptagged(sb, &newfileset, 0,
 882                                                       &ident);
 883                                 if (!bh) {
 884                                         newfileset.logicalBlockNum++;
 885                                         continue;
 886                                 }
 887
 888                                 switch (ident) {
 889                                 case TAG_IDENT_SBD:
 890                                 {
 891                                         struct spaceBitmapDesc *sp;
 892                                         sp = (struct spaceBitmapDesc *)
 893                                                                 bh->b_data;
 894                                         newfileset.logicalBlockNum += 1 +
 895                                                 ((le32_to_cpu(sp->numOfBytes) +
 896                                                   sizeof(struct spaceBitmapDesc)
 897                                                   - 1) >> sb->s_blocksize_bits);
 898                                         brelse(bh);
 899                                         break;
 900                                 }
 901                                 case TAG_IDENT_FSD:
 902                                         *fileset = newfileset;
 903                                         break;
 904                                 default:
 905                                         newfileset.logicalBlockNum++;
 906                                         brelse(bh);
 907                                         bh = NULL;
 908                                         break;
 909                                 }
 910                         } while (newfileset.logicalBlockNum < lastblock &&
 911                                  fileset->logicalBlockNum == 0xFFFFFFFF &&
 912                                  fileset->partitionReferenceNum == 0xFFFF);
 913                 }
 914         }
 915
 916         if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
 917              fileset->partitionReferenceNum != 0xFFFF) && bh) {
 918                 udf_debug("Fileset at block=%d, partition=%d\n",
 919                           fileset->logicalBlockNum,
 920                           fileset->partitionReferenceNum);
 921
 922                 sbi->s_partition = fileset->partitionReferenceNum;
 923                 udf_load_fileset(sb, bh, root);
 924                 brelse(bh);
 925                 return 0;
 926         }
 927         return 1;
 928 }
 929
 930 static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
 931 {
 932         struct primaryVolDesc *pvoldesc;
 933         struct ustr *instr, *outstr;
 934         struct buffer_head *bh;
 935         uint16_t ident;
 936         int ret = 1;
 937
 938         instr = kmalloc(sizeof(struct ustr), GFP_NOFS);
 939         if (!instr)
 940                 return 1;
 941
 942         outstr = kmalloc(sizeof(struct ustr), GFP_NOFS);
 943         if (!outstr)
 944                 goto out1;
 945
 946         bh = udf_read_tagged(sb, block, block, &ident);
 947         if (!bh)
 948                 goto out2;
 949
 950         BUG_ON(ident != TAG_IDENT_PVD);
 951
 952         pvoldesc = (struct primaryVolDesc *)bh->b_data;
 953
 954         if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
 955                               pvoldesc->recordingDateAndTime)) {
 956 #ifdef UDFFS_DEBUG
 957                 struct timestamp *ts = &pvoldesc->recordingDateAndTime;
 958                 udf_debug("recording time %04u/%02u/%02u"
 959                           " %02u:%02u (%x)\n",
 960                           le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
 961                           ts->minute, le16_to_cpu(ts->typeAndTimezone));
 962 #endif
 963         }
 964
 965         if (!udf_build_ustr(instr, pvoldesc->volIdent, 32))
 966                 if (udf_CS0toUTF8(outstr, instr)) {
 967                         strncpy(UDF_SB(sb)->s_volume_ident, outstr->u_name,
 968                                 outstr->u_len > 31 ? 31 : outstr->u_len);
 969                         udf_debug("volIdent[] = '%s'\n",
 970                                         UDF_SB(sb)->s_volume_ident);
 971                 }
 972
 973         if (!udf_build_ustr(instr, pvoldesc->volSetIdent, 128))
 974                 if (udf_CS0toUTF8(outstr, instr))
 975                         udf_debug("volSetIdent[] = '%s'\n", outstr->u_name);
 976
 977         brelse(bh);
 978         ret = 0;
 979 out2:
 980         kfree(outstr);
 981 out1:
 982         kfree(instr);
 983         return ret;
 984 }
 985
 986 static int udf_load_metadata_files(struct super_block *sb, int partition)
 987 {
 988         struct udf_sb_info *sbi = UDF_SB(sb);
 989         struct udf_part_map *map;
 990         struct udf_meta_data *mdata;
 991         struct kernel_lb_addr addr;
 992         int fe_error = 0;
 993
 994         map = &sbi->s_partmaps[partition];
 995         mdata = &map->s_type_specific.s_metadata;
 996
 997         /* metadata address */
 998         addr.logicalBlockNum =  mdata->s_meta_file_loc;
 999         addr.partitionReferenceNum = map->s_partition_num;
1000
1001         udf_debug("Metadata file location: block = %d part = %d\n",
1002                           addr.logicalBlockNum, addr.partitionReferenceNum);
1003
1004         mdata->s_metadata_fe = udf_iget(sb, &addr);
1005
1006         if (mdata->s_metadata_fe == NULL) {
1007                 udf_warning(sb, __func__, "metadata inode efe not found, "
1008                                 "will try mirror inode.");
1009                 fe_error = 1;
1010         } else if (UDF_I(mdata->s_metadata_fe)->i_alloc_type !=
1011                  ICBTAG_FLAG_AD_SHORT) {
1012                 udf_warning(sb, __func__, "metadata inode efe does not have "
1013                         "short allocation descriptors!");
1014                 fe_error = 1;
1015                 iput(mdata->s_metadata_fe);
1016                 mdata->s_metadata_fe = NULL;
1017         }
1018
1019         /* mirror file entry */
1020         addr.logicalBlockNum = mdata->s_mirror_file_loc;
1021         addr.partitionReferenceNum = map->s_partition_num;
1022
1023         udf_debug("Mirror metadata file location: block = %d part = %d\n",
1024                           addr.logicalBlockNum, addr.partitionReferenceNum);
1025
1026         mdata->s_mirror_fe = udf_iget(sb, &addr);
1027
1028         if (mdata->s_mirror_fe == NULL) {
1029                 if (fe_error) {
1030                         udf_error(sb, __func__, "mirror inode efe not found "
1031                         "and metadata inode is missing too, exiting...");
1032                         goto error_exit;
1033                 } else
1034                         udf_warning(sb, __func__, "mirror inode efe not found,"
1035                                         " but metadata inode is OK");
1036         } else if (UDF_I(mdata->s_mirror_fe)->i_alloc_type !=
1037                  ICBTAG_FLAG_AD_SHORT) {
1038                 udf_warning(sb, __func__, "mirror inode efe does not have "
1039                         "short allocation descriptors!");
1040                 iput(mdata->s_mirror_fe);
1041                 mdata->s_mirror_fe = NULL;
1042                 if (fe_error)
1043                         goto error_exit;
1044         }
1045
1046         /*
1047          * bitmap file entry
1048          * Note:
1049          * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
1050         */
1051         if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
1052                 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
1053                 addr.partitionReferenceNum = map->s_partition_num;
1054
1055                 udf_debug("Bitmap file location: block = %d part = %d\n",
1056                         addr.logicalBlockNum, addr.partitionReferenceNum);
1057
1058                 mdata->s_bitmap_fe = udf_iget(sb, &addr);
1059
1060                 if (mdata->s_bitmap_fe == NULL) {
1061                         if (sb->s_flags & MS_RDONLY)
1062                                 udf_warning(sb, __func__, "bitmap inode efe "
1063                                         "not found but it's ok since the disc"
1064                                         " is mounted read-only");
1065                         else {
1066                                 udf_error(sb, __func__, "bitmap inode efe not "
1067                                         "found and attempted read-write mount");
1068                                 goto error_exit;
1069                         }
1070                 }
1071         }
1072
1073         udf_debug("udf_load_metadata_files Ok\n");
1074
1075         return 0;
1076
1077 error_exit:
1078         return 1;
1079 }
1080
1081 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
1082                              struct kernel_lb_addr *root)
1083 {
1084         struct fileSetDesc *fset;
1085
1086         fset = (struct fileSetDesc *)bh->b_data;
1087
1088         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
1089
1090         UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
1091
1092         udf_debug("Rootdir at block=%d, partition=%d\n",
1093                   root->logicalBlockNum, root->partitionReferenceNum);
1094 }
1095
1096 int udf_compute_nr_groups(struct super_block *sb, u32 partition)
1097 {
1098         struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
1099         return DIV_ROUND_UP(map->s_partition_len +
1100                             (sizeof(struct spaceBitmapDesc) << 3),
1101                             sb->s_blocksize * 8);
1102 }
1103
1104 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
1105 {
1106         struct udf_bitmap *bitmap;
1107         int nr_groups;
1108         int size;
1109
1110         nr_groups = udf_compute_nr_groups(sb, index);
1111         size = sizeof(struct udf_bitmap) +
1112                 (sizeof(struct buffer_head *) * nr_groups);
1113
1114         if (size <= PAGE_SIZE)
1115                 bitmap = kmalloc(size, GFP_KERNEL);
1116         else
1117                 bitmap = vmalloc(size); /* TODO: get rid of vmalloc */
1118
1119         if (bitmap == NULL) {
1120                 udf_error(sb, __func__,
1121                           "Unable to allocate space for bitmap "
1122                           "and %d buffer_head pointers", nr_groups);
1123                 return NULL;
1124         }
1125
1126         memset(bitmap, 0x00, size);
1127         bitmap->s_block_bitmap = (struct buffer_head **)(bitmap + 1);
1128         bitmap->s_nr_groups = nr_groups;
1129         return bitmap;
1130 }
1131
1132 static int udf_fill_partdesc_info(struct super_block *sb,
1133                 struct partitionDesc *p, int p_index)
1134 {
1135         struct udf_part_map *map;
1136         struct udf_sb_info *sbi = UDF_SB(sb);
1137         struct partitionHeaderDesc *phd;
1138
1139         map = &sbi->s_partmaps[p_index];
1140
1141         map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
1142         map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
1143
1144         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
1145                 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
1146         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
1147                 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
1148         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
1149                 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
1150         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
1151                 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
1152
1153         udf_debug("Partition (%d type %x) starts at physical %d, "
1154                   "block length %d\n", p_index,
1155                   map->s_partition_type, map->s_partition_root,
1156                   map->s_partition_len);
1157
1158         if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1159             strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
1160                 return 0;
1161
1162         phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1163         if (phd->unallocSpaceTable.extLength) {
1164                 struct kernel_lb_addr loc = {
1165                         .logicalBlockNum = le32_to_cpu(
1166                                 phd->unallocSpaceTable.extPosition),
1167                         .partitionReferenceNum = p_index,
1168                 };
1169
1170                 map->s_uspace.s_table = udf_iget(sb, &loc);
1171                 if (!map->s_uspace.s_table) {
1172                         udf_debug("cannot load unallocSpaceTable (part %d)\n",
1173                                         p_index);
1174                         return 1;
1175                 }
1176                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1177                 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
1178                                 p_index, map->s_uspace.s_table->i_ino);
1179         }
1180
1181         if (phd->unallocSpaceBitmap.extLength) {
1182                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1183                 if (!bitmap)
1184                         return 1;
1185                 map->s_uspace.s_bitmap = bitmap;
1186                 bitmap->s_extLength = le32_to_cpu(
1187                                 phd->unallocSpaceBitmap.extLength);
1188                 bitmap->s_extPosition = le32_to_cpu(
1189                                 phd->unallocSpaceBitmap.extPosition);
1190                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1191                 udf_debug("unallocSpaceBitmap (part %d) @ %d\n", p_index,
1192                                                 bitmap->s_extPosition);
1193         }
1194
1195         if (phd->partitionIntegrityTable.extLength)
1196                 udf_debug("partitionIntegrityTable (part %d)\n", p_index);
1197
1198         if (phd->freedSpaceTable.extLength) {
1199                 struct kernel_lb_addr loc = {
1200                         .logicalBlockNum = le32_to_cpu(
1201                                 phd->freedSpaceTable.extPosition),
1202                         .partitionReferenceNum = p_index,
1203                 };
1204
1205                 map->s_fspace.s_table = udf_iget(sb, &loc);
1206                 if (!map->s_fspace.s_table) {
1207                         udf_debug("cannot load freedSpaceTable (part %d)\n",
1208                                 p_index);
1209                         return 1;
1210                 }
1211
1212                 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
1213                 udf_debug("freedSpaceTable (part %d) @ %ld\n",
1214                                 p_index, map->s_fspace.s_table->i_ino);
1215         }
1216
1217         if (phd->freedSpaceBitmap.extLength) {
1218                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1219                 if (!bitmap)
1220                         return 1;
1221                 map->s_fspace.s_bitmap = bitmap;
1222                 bitmap->s_extLength = le32_to_cpu(
1223                                 phd->freedSpaceBitmap.extLength);
1224                 bitmap->s_extPosition = le32_to_cpu(
1225                                 phd->freedSpaceBitmap.extPosition);
1226                 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1227                 udf_debug("freedSpaceBitmap (part %d) @ %d\n", p_index,
1228                                         bitmap->s_extPosition);
1229         }
1230         return 0;
1231 }
1232
1233 static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1234 {
1235         struct udf_sb_info *sbi = UDF_SB(sb);
1236         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1237         struct kernel_lb_addr ino;
1238         struct buffer_head *bh = NULL;
1239         struct udf_inode_info *vati;
1240         uint32_t pos;
1241         struct virtualAllocationTable20 *vat20;
1242
1243         /* VAT file entry is in the last recorded block */
1244         ino.partitionReferenceNum = type1_index;
1245         ino.logicalBlockNum = sbi->s_last_block - map->s_partition_root;
1246         sbi->s_vat_inode = udf_iget(sb, &ino);
1247         if (!sbi->s_vat_inode)
1248                 return 1;
1249
1250         if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1251                 map->s_type_specific.s_virtual.s_start_offset = 0;
1252                 map->s_type_specific.s_virtual.s_num_entries =
1253                         (sbi->s_vat_inode->i_size - 36) >> 2;
1254         } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1255                 vati = UDF_I(sbi->s_vat_inode);
1256                 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1257                         pos = udf_block_map(sbi->s_vat_inode, 0);
1258                         bh = sb_bread(sb, pos);
1259                         if (!bh)
1260                                 return 1;
1261                         vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1262                 } else {
1263                         vat20 = (struct virtualAllocationTable20 *)
1264                                                         vati->i_ext.i_data;
1265                 }
1266
1267                 map->s_type_specific.s_virtual.s_start_offset =
1268                         le16_to_cpu(vat20->lengthHeader);
1269                 map->s_type_specific.s_virtual.s_num_entries =
1270                         (sbi->s_vat_inode->i_size -
1271                                 map->s_type_specific.s_virtual.
1272                                         s_start_offset) >> 2;
1273                 brelse(bh);
1274         }
1275         return 0;
1276 }
1277
1278 static int udf_load_partdesc(struct super_block *sb, sector_t block)
1279 {
1280         struct buffer_head *bh;
1281         struct partitionDesc *p;
1282         struct udf_part_map *map;
1283         struct udf_sb_info *sbi = UDF_SB(sb);
1284         int i, type1_idx;
1285         uint16_t partitionNumber;
1286         uint16_t ident;
1287         int ret = 0;
1288
1289         bh = udf_read_tagged(sb, block, block, &ident);
1290         if (!bh)
1291                 return 1;
1292         if (ident != TAG_IDENT_PD)
1293                 goto out_bh;
1294
1295         p = (struct partitionDesc *)bh->b_data;
1296         partitionNumber = le16_to_cpu(p->partitionNumber);
1297
1298         /* First scan for TYPE1, SPARABLE and METADATA partitions */
1299         for (i = 0; i < sbi->s_partitions; i++) {
1300                 map = &sbi->s_partmaps[i];
1301                 udf_debug("Searching map: (%d == %d)\n",
1302                           map->s_partition_num, partitionNumber);
1303                 if (map->s_partition_num == partitionNumber &&
1304                     (map->s_partition_type == UDF_TYPE1_MAP15 ||
1305                      map->s_partition_type == UDF_SPARABLE_MAP15))
1306                         break;
1307         }
1308
1309         if (i >= sbi->s_partitions) {
1310                 udf_debug("Partition (%d) not found in partition map\n",
1311                           partitionNumber);
1312                 goto out_bh;
1313         }
1314
1315         ret = udf_fill_partdesc_info(sb, p, i);
1316
1317         /*
1318          * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1319          * PHYSICAL partitions are already set up
1320          */
1321         type1_idx = i;
1322         for (i = 0; i < sbi->s_partitions; i++) {
1323                 map = &sbi->s_partmaps[i];
1324
1325                 if (map->s_partition_num == partitionNumber &&
1326                     (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1327                      map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1328                      map->s_partition_type == UDF_METADATA_MAP25))
1329                         break;
1330         }
1331
1332         if (i >= sbi->s_partitions)
1333                 goto out_bh;
1334
1335         ret = udf_fill_partdesc_info(sb, p, i);
1336         if (ret)
1337                 goto out_bh;
1338
1339         if (map->s_partition_type == UDF_METADATA_MAP25) {
1340                 ret = udf_load_metadata_files(sb, i);
1341                 if (ret) {
1342                         printk(KERN_ERR "UDF-fs: error loading MetaData "
1343                         "partition map %d\n", i);
1344                         goto out_bh;
1345                 }
1346         } else {
1347                 ret = udf_load_vat(sb, i, type1_idx);
1348                 if (ret)
1349                         goto out_bh;
1350                 /*
1351                  * Mark filesystem read-only if we have a partition with
1352                  * virtual map since we don't handle writing to it (we
1353                  * overwrite blocks instead of relocating them).
1354                  */
1355                 sb->s_flags |= MS_RDONLY;
1356                 printk(KERN_NOTICE "UDF-fs: Filesystem marked read-only "
1357                         "because writing to pseudooverwrite partition is "
1358                         "not implemented.\n");
1359         }
1360 out_bh:
1361         /* In case loading failed, we handle cleanup in udf_fill_super */
1362         brelse(bh);
1363         return ret;
1364 }
1365
1366 static int udf_load_logicalvol(struct super_block *sb, sector_t block,
1367                                struct kernel_lb_addr *fileset)
1368 {
1369         struct logicalVolDesc *lvd;
1370         int i, j, offset;
1371         uint8_t type;
1372         struct udf_sb_info *sbi = UDF_SB(sb);
1373         struct genericPartitionMap *gpm;
1374         uint16_t ident;
1375         struct buffer_head *bh;
1376         int ret = 0;
1377
1378         bh = udf_read_tagged(sb, block, block, &ident);
1379         if (!bh)
1380                 return 1;
1381         BUG_ON(ident != TAG_IDENT_LVD);
1382         lvd = (struct logicalVolDesc *)bh->b_data;
1383
1384         i = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1385         if (i != 0) {
1386                 ret = i;
1387                 goto out_bh;
1388         }
1389
1390         for (i = 0, offset = 0;
1391              i < sbi->s_partitions && offset < le32_to_cpu(lvd->mapTableLength);
1392              i++, offset += gpm->partitionMapLength) {
1393                 struct udf_part_map *map = &sbi->s_partmaps[i];
1394                 gpm = (struct genericPartitionMap *)
1395                                 &(lvd->partitionMaps[offset]);
1396                 type = gpm->partitionMapType;
1397                 if (type == 1) {
1398                         struct genericPartitionMap1 *gpm1 =
1399                                 (struct genericPartitionMap1 *)gpm;
1400                         map->s_partition_type = UDF_TYPE1_MAP15;
1401                         map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1402                         map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1403                         map->s_partition_func = NULL;
1404                 } else if (type == 2) {
1405                         struct udfPartitionMap2 *upm2 =
1406                                                 (struct udfPartitionMap2 *)gpm;
1407                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1408                                                 strlen(UDF_ID_VIRTUAL))) {
1409                                 u16 suf =
1410                                         le16_to_cpu(((__le16 *)upm2->partIdent.
1411                                                         identSuffix)[0]);
1412                                 if (suf < 0x0200) {
1413                                         map->s_partition_type =
1414                                                         UDF_VIRTUAL_MAP15;
1415                                         map->s_partition_func =
1416                                                         udf_get_pblock_virt15;
1417                                 } else {
1418                                         map->s_partition_type =
1419                                                         UDF_VIRTUAL_MAP20;
1420                                         map->s_partition_func =
1421                                                         udf_get_pblock_virt20;
1422                                 }
1423                         } else if (!strncmp(upm2->partIdent.ident,
1424                                                 UDF_ID_SPARABLE,
1425                                                 strlen(UDF_ID_SPARABLE))) {
1426                                 uint32_t loc;
1427                                 struct sparingTable *st;
1428                                 struct sparablePartitionMap *spm =
1429                                         (struct sparablePartitionMap *)gpm;
1430
1431                                 map->s_partition_type = UDF_SPARABLE_MAP15;
1432                                 map->s_type_specific.s_sparing.s_packet_len =
1433                                                 le16_to_cpu(spm->packetLength);
1434                                 for (j = 0; j < spm->numSparingTables; j++) {
1435                                         struct buffer_head *bh2;
1436
1437                                         loc = le32_to_cpu(
1438                                                 spm->locSparingTable[j]);
1439                                         bh2 = udf_read_tagged(sb, loc, loc,
1440                                                              &ident);
1441                                         map->s_type_specific.s_sparing.
1442                                                         s_spar_map[j] = bh2;
1443
1444                                         if (bh2 == NULL)
1445                                                 continue;
1446
1447                                         st = (struct sparingTable *)bh2->b_data;
1448                                         if (ident != 0 || strncmp(
1449                                                 st->sparingIdent.ident,
1450                                                 UDF_ID_SPARING,
1451                                                 strlen(UDF_ID_SPARING))) {
1452                                                 brelse(bh2);
1453                                                 map->s_type_specific.s_sparing.
1454                                                         s_spar_map[j] = NULL;
1455                                         }
1456                                 }
1457                                 map->s_partition_func = udf_get_pblock_spar15;
1458                         } else if (!strncmp(upm2->partIdent.ident,
1459                                                 UDF_ID_METADATA,
1460                                                 strlen(UDF_ID_METADATA))) {
1461                                 struct udf_meta_data *mdata =
1462                                         &map->s_type_specific.s_metadata;
1463                                 struct metadataPartitionMap *mdm =
1464                                                 (struct metadataPartitionMap *)
1465                                                 &(lvd->partitionMaps[offset]);
1466                                 udf_debug("Parsing Logical vol part %d "
1467                                         "type %d  id=%s\n", i, type,
1468                                         UDF_ID_METADATA);
1469
1470                                 map->s_partition_type = UDF_METADATA_MAP25;
1471                                 map->s_partition_func = udf_get_pblock_meta25;
1472
1473                                 mdata->s_meta_file_loc   =
1474                                         le32_to_cpu(mdm->metadataFileLoc);
1475                                 mdata->s_mirror_file_loc =
1476                                         le32_to_cpu(mdm->metadataMirrorFileLoc);
1477                                 mdata->s_bitmap_file_loc =
1478                                         le32_to_cpu(mdm->metadataBitmapFileLoc);
1479                                 mdata->s_alloc_unit_size =
1480                                         le32_to_cpu(mdm->allocUnitSize);
1481                                 mdata->s_align_unit_size =
1482                                         le16_to_cpu(mdm->alignUnitSize);
1483                                 mdata->s_dup_md_flag     =
1484                                         mdm->flags & 0x01;
1485
1486                                 udf_debug("Metadata Ident suffix=0x%x\n",
1487                                         (le16_to_cpu(
1488                                          ((__le16 *)
1489                                               mdm->partIdent.identSuffix)[0])));
1490                                 udf_debug("Metadata part num=%d\n",
1491                                         le16_to_cpu(mdm->partitionNum));
1492                                 udf_debug("Metadata part alloc unit size=%d\n",
1493                                         le32_to_cpu(mdm->allocUnitSize));
1494                                 udf_debug("Metadata file loc=%d\n",
1495                                         le32_to_cpu(mdm->metadataFileLoc));
1496                                 udf_debug("Mirror file loc=%d\n",
1497                                        le32_to_cpu(mdm->metadataMirrorFileLoc));
1498                                 udf_debug("Bitmap file loc=%d\n",
1499                                        le32_to_cpu(mdm->metadataBitmapFileLoc));
1500                                 udf_debug("Duplicate Flag: %d %d\n",
1501                                         mdata->s_dup_md_flag, mdm->flags);
1502                         } else {
1503                                 udf_debug("Unknown ident: %s\n",
1504                                           upm2->partIdent.ident);
1505                                 continue;
1506                         }
1507                         map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1508                         map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1509                 }
1510                 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1511                           i, map->s_partition_num, type,
1512                           map->s_volumeseqnum);
1513         }
1514
1515         if (fileset) {
1516                 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
1517
1518                 *fileset = lelb_to_cpu(la->extLocation);
1519                 udf_debug("FileSet found in LogicalVolDesc at block=%d, "
1520                           "partition=%d\n", fileset->logicalBlockNum,
1521                           fileset->partitionReferenceNum);
1522         }
1523         if (lvd->integritySeqExt.extLength)
1524                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1525
1526 out_bh:
1527         brelse(bh);
1528         return ret;
1529 }
1530
1531 /*
1532  * udf_load_logicalvolint
1533  *
1534  */
1535 static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
1536 {
1537         struct buffer_head *bh = NULL;
1538         uint16_t ident;
1539         struct udf_sb_info *sbi = UDF_SB(sb);
1540         struct logicalVolIntegrityDesc *lvid;
1541
1542         while (loc.extLength > 0 &&
1543                (bh = udf_read_tagged(sb, loc.extLocation,
1544                                      loc.extLocation, &ident)) &&
1545                ident == TAG_IDENT_LVID) {
1546                 sbi->s_lvid_bh = bh;
1547                 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1548
1549                 if (lvid->nextIntegrityExt.extLength)
1550                         udf_load_logicalvolint(sb,
1551                                 leea_to_cpu(lvid->nextIntegrityExt));
1552
1553                 if (sbi->s_lvid_bh != bh)
1554                         brelse(bh);
1555                 loc.extLength -= sb->s_blocksize;
1556                 loc.extLocation++;
1557         }
1558         if (sbi->s_lvid_bh != bh)
1559                 brelse(bh);
1560 }
1561
1562 /*
1563  * udf_process_sequence
1564  *
1565  * PURPOSE
1566  *      Process a main/reserve volume descriptor sequence.
1567  *
1568  * PRE-CONDITIONS
1569  *      sb                      Pointer to _locked_ superblock.
1570  *      block                   First block of first extent of the sequence.
1571  *      lastblock               Lastblock of first extent of the sequence.
1572  *
1573  * HISTORY
1574  *      July 1, 1997 - Andrew E. Mileski
1575  *      Written, tested, and released.
1576  */
1577 static noinline int udf_process_sequence(struct super_block *sb, long block,
1578                                 long lastblock, struct kernel_lb_addr *fileset)
1579 {
1580         struct buffer_head *bh = NULL;
1581         struct udf_vds_record vds[VDS_POS_LENGTH];
1582         struct udf_vds_record *curr;
1583         struct generic_desc *gd;
1584         struct volDescPtr *vdp;
1585         int done = 0;
1586         uint32_t vdsn;
1587         uint16_t ident;
1588         long next_s = 0, next_e = 0;
1589
1590         memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1591
1592         /*
1593          * Read the main descriptor sequence and find which descriptors
1594          * are in it.
1595          */
1596         for (; (!done && block <= lastblock); block++) {
1597
1598                 bh = udf_read_tagged(sb, block, block, &ident);
1599                 if (!bh) {
1600                         printk(KERN_ERR "udf: Block %Lu of volume descriptor "
1601                                "sequence is corrupted or we could not read "
1602                                "it.\n", (unsigned long long)block);
1603                         return 1;
1604                 }
1605
1606                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1607                 gd = (struct generic_desc *)bh->b_data;
1608                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1609                 switch (ident) {
1610                 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1611                         curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1612                         if (vdsn >= curr->volDescSeqNum) {
1613                                 curr->volDescSeqNum = vdsn;
1614                                 curr->block = block;
1615                         }
1616                         break;
1617                 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1618                         curr = &vds[VDS_POS_VOL_DESC_PTR];
1619                         if (vdsn >= curr->volDescSeqNum) {
1620                                 curr->volDescSeqNum = vdsn;
1621                                 curr->block = block;
1622
1623                                 vdp = (struct volDescPtr *)bh->b_data;
1624                                 next_s = le32_to_cpu(
1625                                         vdp->nextVolDescSeqExt.extLocation);
1626                                 next_e = le32_to_cpu(
1627                                         vdp->nextVolDescSeqExt.extLength);
1628                                 next_e = next_e >> sb->s_blocksize_bits;
1629                                 next_e += next_s;
1630                         }
1631                         break;
1632                 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1633                         curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1634                         if (vdsn >= curr->volDescSeqNum) {
1635                                 curr->volDescSeqNum = vdsn;
1636                                 curr->block = block;
1637                         }
1638                         break;
1639                 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1640                         curr = &vds[VDS_POS_PARTITION_DESC];
1641                         if (!curr->block)
1642                                 curr->block = block;
1643                         break;
1644                 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1645                         curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1646                         if (vdsn >= curr->volDescSeqNum) {
1647                                 curr->volDescSeqNum = vdsn;
1648                                 curr->block = block;
1649                         }
1650                         break;
1651                 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1652                         curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1653                         if (vdsn >= curr->volDescSeqNum) {
1654                                 curr->volDescSeqNum = vdsn;
1655                                 curr->block = block;
1656                         }
1657                         break;
1658                 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1659                         vds[VDS_POS_TERMINATING_DESC].block = block;
1660                         if (next_e) {
1661                                 block = next_s;
1662                                 lastblock = next_e;
1663                                 next_s = next_e = 0;
1664                         } else
1665                                 done = 1;
1666                         break;
1667                 }
1668                 brelse(bh);
1669         }
1670         /*
1671          * Now read interesting descriptors again and process them
1672          * in a suitable order
1673          */
1674         if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1675                 printk(KERN_ERR "udf: Primary Volume Descriptor not found!\n");
1676                 return 1;
1677         }
1678         if (udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block))
1679                 return 1;
1680
1681         if (vds[VDS_POS_LOGICAL_VOL_DESC].block && udf_load_logicalvol(sb,
1682             vds[VDS_POS_LOGICAL_VOL_DESC].block, fileset))
1683                 return 1;
1684
1685         if (vds[VDS_POS_PARTITION_DESC].block) {
1686                 /*
1687                  * We rescan the whole descriptor sequence to find
1688                  * partition descriptor blocks and process them.
1689                  */
1690                 for (block = vds[VDS_POS_PARTITION_DESC].block;
1691                      block < vds[VDS_POS_TERMINATING_DESC].block;
1692                      block++)
1693                         if (udf_load_partdesc(sb, block))
1694                                 return 1;
1695         }
1696
1697         return 0;
1698 }
1699
1700 /*
1701  * udf_check_valid()
1702  */
1703 static int udf_check_valid(struct super_block *sb, int novrs, int silent)
1704 {
1705         long block;
1706         struct udf_sb_info *sbi = UDF_SB(sb);
1707
1708         if (novrs) {
1709                 udf_debug("Validity check skipped because of novrs option\n");
1710                 return 0;
1711         }
1712         /* Check that it is NSR02 compliant */
1713         /* Process any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
1714         block = udf_vrs(sb, silent);
1715         if (block == -1)
1716                 udf_debug("Failed to read byte 32768. Assuming open "
1717                           "disc. Skipping validity check\n");
1718         if (block && !sbi->s_last_block)
1719                 sbi->s_last_block = udf_get_last_block(sb);
1720         return !block;
1721 }
1722
1723 static int udf_load_sequence(struct super_block *sb, struct kernel_lb_addr *fileset)
1724 {
1725         struct anchorVolDescPtr *anchor;
1726         uint16_t ident;
1727         struct buffer_head *bh;
1728         long main_s, main_e, reserve_s, reserve_e;
1729         int i;
1730         struct udf_sb_info *sbi;
1731
1732         if (!sb)
1733                 return 1;
1734         sbi = UDF_SB(sb);
1735
1736         for (i = 0; i < ARRAY_SIZE(sbi->s_anchor); i++) {
1737                 if (!sbi->s_anchor[i])
1738                         continue;
1739
1740                 bh = udf_read_tagged(sb, sbi->s_anchor[i], sbi->s_anchor[i],
1741                                      &ident);
1742                 if (!bh)
1743                         continue;
1744
1745                 anchor = (struct anchorVolDescPtr *)bh->b_data;
1746
1747                 /* Locate the main sequence */
1748                 main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1749                 main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1750                 main_e = main_e >> sb->s_blocksize_bits;
1751                 main_e += main_s;
1752
1753                 /* Locate the reserve sequence */
1754                 reserve_s = le32_to_cpu(
1755                                 anchor->reserveVolDescSeqExt.extLocation);
1756                 reserve_e = le32_to_cpu(
1757                                 anchor->reserveVolDescSeqExt.extLength);
1758                 reserve_e = reserve_e >> sb->s_blocksize_bits;
1759                 reserve_e += reserve_s;
1760
1761                 brelse(bh);
1762
1763                 /* Process the main & reserve sequences */
1764                 /* responsible for finding the PartitionDesc(s) */
1765                 if (!(udf_process_sequence(sb, main_s, main_e,
1766                                            fileset) &&
1767                       udf_process_sequence(sb, reserve_s, reserve_e,
1768                                            fileset)))
1769                         break;
1770         }
1771
1772         if (i == ARRAY_SIZE(sbi->s_anchor)) {
1773                 udf_debug("No Anchor block found\n");
1774                 return 1;
1775         }
1776         udf_debug("Using anchor in block %d\n", sbi->s_anchor[i]);
1777
1778         return 0;
1779 }
1780
1781 static void udf_open_lvid(struct super_block *sb)
1782 {
1783         struct udf_sb_info *sbi = UDF_SB(sb);
1784         struct buffer_head *bh = sbi->s_lvid_bh;
1785         struct logicalVolIntegrityDesc *lvid;
1786         struct logicalVolIntegrityDescImpUse *lvidiu;
1787         if (!bh)
1788                 return;
1789
1790         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1791         lvidiu = udf_sb_lvidiu(sbi);
1792
1793         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1794         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1795         udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
1796                                 CURRENT_TIME);
1797         lvid->integrityType = LVID_INTEGRITY_TYPE_OPEN;
1798
1799         lvid->descTag.descCRC = cpu_to_le16(
1800                 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1801                         le16_to_cpu(lvid->descTag.descCRCLength)));
1802
1803         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1804         mark_buffer_dirty(bh);
1805 }
1806
1807 static void udf_close_lvid(struct super_block *sb)
1808 {
1809         struct udf_sb_info *sbi = UDF_SB(sb);
1810         struct buffer_head *bh = sbi->s_lvid_bh;
1811         struct logicalVolIntegrityDesc *lvid;
1812         struct logicalVolIntegrityDescImpUse *lvidiu;
1813
1814         if (!bh)
1815                 return;
1816
1817         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1818
1819         if (lvid->integrityType != LVID_INTEGRITY_TYPE_OPEN)
1820                 return;
1821
1822         lvidiu = udf_sb_lvidiu(sbi);
1823         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1824         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1825         udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
1826         if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1827                 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1828         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1829                 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1830         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
1831                 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
1832         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1833
1834         lvid->descTag.descCRC = cpu_to_le16(
1835                         crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1836                                 le16_to_cpu(lvid->descTag.descCRCLength)));
1837
1838         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1839         mark_buffer_dirty(bh);
1840 }
1841
1842 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
1843 {
1844         int i;
1845         int nr_groups = bitmap->s_nr_groups;
1846         int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
1847                                                 nr_groups);
1848
1849         for (i = 0; i < nr_groups; i++)
1850                 if (bitmap->s_block_bitmap[i])
1851                         brelse(bitmap->s_block_bitmap[i]);
1852
1853         if (size <= PAGE_SIZE)
1854                 kfree(bitmap);
1855         else
1856                 vfree(bitmap);
1857 }
1858
1859 static void udf_free_partition(struct udf_part_map *map)
1860 {
1861         int i;
1862         struct udf_meta_data *mdata;
1863
1864         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1865                 iput(map->s_uspace.s_table);
1866         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1867                 iput(map->s_fspace.s_table);
1868         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1869                 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
1870         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1871                 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
1872         if (map->s_partition_type == UDF_SPARABLE_MAP15)
1873                 for (i = 0; i < 4; i++)
1874                         brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
1875         else if (map->s_partition_type == UDF_METADATA_MAP25) {
1876                 mdata = &map->s_type_specific.s_metadata;
1877                 iput(mdata->s_metadata_fe);
1878                 mdata->s_metadata_fe = NULL;
1879
1880                 iput(mdata->s_mirror_fe);
1881                 mdata->s_mirror_fe = NULL;
1882
1883                 iput(mdata->s_bitmap_fe);
1884                 mdata->s_bitmap_fe = NULL;
1885         }
1886 }
1887
1888 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1889 {
1890         int i;
1891         struct inode *inode = NULL;
1892         struct udf_options uopt;
1893         struct kernel_lb_addr rootdir, fileset;
1894         struct udf_sb_info *sbi;
1895
1896         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1897         uopt.uid = -1;
1898         uopt.gid = -1;
1899         uopt.umask = 0;
1900         uopt.fmode = UDF_INVALID_MODE;
1901         uopt.dmode = UDF_INVALID_MODE;
1902
1903         sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1904         if (!sbi)
1905                 return -ENOMEM;
1906
1907         sb->s_fs_info = sbi;
1908
1909         mutex_init(&sbi->s_alloc_mutex);
1910
1911         if (!udf_parse_options((char *)options, &uopt, false))
1912                 goto error_out;
1913
1914         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1915             uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
1916                 udf_error(sb, "udf_read_super",
1917                           "utf8 cannot be combined with iocharset\n");
1918                 goto error_out;
1919         }
1920 #ifdef CONFIG_UDF_NLS
1921         if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1922                 uopt.nls_map = load_nls_default();
1923                 if (!uopt.nls_map)
1924                         uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1925                 else
1926                         udf_debug("Using default NLS map\n");
1927         }
1928 #endif
1929         if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1930                 uopt.flags |= (1 << UDF_FLAG_UTF8);
1931
1932         fileset.logicalBlockNum = 0xFFFFFFFF;
1933         fileset.partitionReferenceNum = 0xFFFF;
1934
1935         sbi->s_flags = uopt.flags;
1936         sbi->s_uid = uopt.uid;
1937         sbi->s_gid = uopt.gid;
1938         sbi->s_umask = uopt.umask;
1939         sbi->s_fmode = uopt.fmode;
1940         sbi->s_dmode = uopt.dmode;
1941         sbi->s_nls_map = uopt.nls_map;
1942
1943         /* Set the block size for all transfers */
1944         if (!sb_min_blocksize(sb, uopt.blocksize)) {
1945                 udf_debug("Bad block size (%d)\n", uopt.blocksize);
1946                 printk(KERN_ERR "udf: bad block size (%d)\n", uopt.blocksize);
1947                 goto error_out;
1948         }
1949
1950         if (uopt.session == 0xFFFFFFFF)
1951                 sbi->s_session = udf_get_last_session(sb);
1952         else
1953                 sbi->s_session = uopt.session;
1954
1955         udf_debug("Multi-session=%d\n", sbi->s_session);
1956
1957         sbi->s_last_block = uopt.lastblock;
1958         sbi->s_anchor[0] = sbi->s_anchor[1] = 0;
1959         sbi->s_anchor[2] = uopt.anchor;
1960
1961         if (udf_check_valid(sb, uopt.novrs, silent)) {
1962                 /* read volume recognition sequences */
1963                 printk(KERN_WARNING "UDF-fs: No VRS found\n");
1964                 goto error_out;
1965         }
1966
1967         udf_find_anchor(sb);
1968
1969         /* Fill in the rest of the superblock */
1970         sb->s_op = &udf_sb_ops;
1971         sb->s_export_op = &udf_export_ops;
1972         sb->dq_op = NULL;
1973         sb->s_dirt = 0;
1974         sb->s_magic = UDF_SUPER_MAGIC;
1975         sb->s_time_gran = 1000;
1976
1977         if (udf_load_sequence(sb, &fileset)) {
1978                 printk(KERN_WARNING "UDF-fs: No partition found (1)\n");
1979                 goto error_out;
1980         }
1981
1982         udf_debug("Lastblock=%d\n", sbi->s_last_block);
1983
1984         if (sbi->s_lvid_bh) {
1985                 struct logicalVolIntegrityDescImpUse *lvidiu =
1986                                                         udf_sb_lvidiu(sbi);
1987                 uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
1988                 uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
1989                 /* uint16_t maxUDFWriteRev =
1990                                 le16_to_cpu(lvidiu->maxUDFWriteRev); */
1991
1992                 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
1993                         printk(KERN_ERR "UDF-fs: minUDFReadRev=%x "
1994                                         "(max is %x)\n",
1995                                le16_to_cpu(lvidiu->minUDFReadRev),
1996                                UDF_MAX_READ_VERSION);
1997                         goto error_out;
1998                 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
1999                         sb->s_flags |= MS_RDONLY;
2000
2001                 sbi->s_udfrev = minUDFWriteRev;
2002
2003                 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
2004                         UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
2005                 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
2006                         UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
2007         }
2008
2009         if (!sbi->s_partitions) {
2010                 printk(KERN_WARNING "UDF-fs: No partition found (2)\n");
2011                 goto error_out;
2012         }
2013
2014         if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
2015                         UDF_PART_FLAG_READ_ONLY) {
2016                 printk(KERN_NOTICE "UDF-fs: Partition marked readonly; "
2017                                    "forcing readonly mount\n");
2018                 sb->s_flags |= MS_RDONLY;
2019         }
2020
2021         if (udf_find_fileset(sb, &fileset, &rootdir)) {
2022                 printk(KERN_WARNING "UDF-fs: No fileset found\n");
2023                 goto error_out;
2024         }
2025
2026         if (!silent) {
2027                 struct timestamp ts;
2028                 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
2029                 udf_info("UDF: Mounting volume '%s', "
2030                          "timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
2031                          sbi->s_volume_ident, le16_to_cpu(ts.year), ts.month, ts.day,
2032                          ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
2033         }
2034         if (!(sb->s_flags & MS_RDONLY))
2035                 udf_open_lvid(sb);
2036
2037         /* Assign the root inode */
2038         /* assign inodes by physical block number */
2039         /* perhaps it's not extensible enough, but for now ... */
2040         inode = udf_iget(sb, &rootdir);
2041         if (!inode) {
2042                 printk(KERN_ERR "UDF-fs: Error in udf_iget, block=%d, "
2043                                 "partition=%d\n",
2044                        rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
2045                 goto error_out;
2046         }
2047
2048         /* Allocate a dentry for the root inode */
2049         sb->s_root = d_alloc_root(inode);
2050         if (!sb->s_root) {
2051                 printk(KERN_ERR "UDF-fs: Couldn't allocate root dentry\n");
2052                 iput(inode);
2053                 goto error_out;
2054         }
2055         sb->s_maxbytes = MAX_LFS_FILESIZE;
2056         return 0;
2057
2058 error_out:
2059         if (sbi->s_vat_inode)
2060                 iput(sbi->s_vat_inode);
2061         if (sbi->s_partitions)
2062                 for (i = 0; i < sbi->s_partitions; i++)
2063                         udf_free_partition(&sbi->s_partmaps[i]);
2064 #ifdef CONFIG_UDF_NLS
2065         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2066                 unload_nls(sbi->s_nls_map);
2067 #endif
2068         if (!(sb->s_flags & MS_RDONLY))
2069                 udf_close_lvid(sb);
2070         brelse(sbi->s_lvid_bh);
2071
2072         kfree(sbi->s_partmaps);
2073         kfree(sbi);
2074         sb->s_fs_info = NULL;
2075
2076         return -EINVAL;
2077 }
2078
2079 static void udf_error(struct super_block *sb, const char *function,
2080                       const char *fmt, ...)
2081 {
2082         va_list args;
2083
2084         if (!(sb->s_flags & MS_RDONLY)) {
2085                 /* mark sb error */
2086                 sb->s_dirt = 1;
2087         }
2088         va_start(args, fmt);
2089         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2090         va_end(args);
2091         printk(KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
2092                 sb->s_id, function, error_buf);
2093 }
2094
2095 void udf_warning(struct super_block *sb, const char *function,
2096                  const char *fmt, ...)
2097 {
2098         va_list args;
2099
2100         va_start(args, fmt);
2101         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2102         va_end(args);
2103         printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
2104                sb->s_id, function, error_buf);
2105 }
2106
2107 static void udf_put_super(struct super_block *sb)
2108 {
2109         int i;
2110         struct udf_sb_info *sbi;
2111
2112         sbi = UDF_SB(sb);
2113         if (sbi->s_vat_inode)
2114                 iput(sbi->s_vat_inode);
2115         if (sbi->s_partitions)
2116                 for (i = 0; i < sbi->s_partitions; i++)
2117                         udf_free_partition(&sbi->s_partmaps[i]);
2118 #ifdef CONFIG_UDF_NLS
2119         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2120                 unload_nls(sbi->s_nls_map);
2121 #endif
2122         if (!(sb->s_flags & MS_RDONLY))
2123                 udf_close_lvid(sb);
2124         brelse(sbi->s_lvid_bh);
2125         kfree(sbi->s_partmaps);
2126         kfree(sb->s_fs_info);
2127         sb->s_fs_info = NULL;
2128 }
2129
2130 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
2131 {
2132         struct super_block *sb = dentry->d_sb;
2133         struct udf_sb_info *sbi = UDF_SB(sb);
2134         struct logicalVolIntegrityDescImpUse *lvidiu;
2135         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
2136
2137         if (sbi->s_lvid_bh != NULL)
2138                 lvidiu = udf_sb_lvidiu(sbi);
2139         else
2140                 lvidiu = NULL;
2141
2142         buf->f_type = UDF_SUPER_MAGIC;
2143         buf->f_bsize = sb->s_blocksize;
2144         buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
2145         buf->f_bfree = udf_count_free(sb);
2146         buf->f_bavail = buf->f_bfree;
2147         buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2148                                           le32_to_cpu(lvidiu->numDirs)) : 0)
2149                         + buf->f_bfree;
2150         buf->f_ffree = buf->f_bfree;
2151         buf->f_namelen = UDF_NAME_LEN - 2;
2152         buf->f_fsid.val[0] = (u32)id;
2153         buf->f_fsid.val[1] = (u32)(id >> 32);
2154
2155         return 0;
2156 }
2157
2158 static unsigned int udf_count_free_bitmap(struct super_block *sb,
2159                                           struct udf_bitmap *bitmap)
2160 {
2161         struct buffer_head *bh = NULL;
2162         unsigned int accum = 0;
2163         int index;
2164         int block = 0, newblock;
2165         struct kernel_lb_addr loc;
2166         uint32_t bytes;
2167         uint8_t *ptr;
2168         uint16_t ident;
2169         struct spaceBitmapDesc *bm;
2170
2171         lock_kernel();
2172
2173         loc.logicalBlockNum = bitmap->s_extPosition;
2174         loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
2175         bh = udf_read_ptagged(sb, &loc, 0, &ident);
2176
2177         if (!bh) {
2178                 printk(KERN_ERR "udf: udf_count_free failed\n");
2179                 goto out;
2180         } else if (ident != TAG_IDENT_SBD) {
2181                 brelse(bh);
2182                 printk(KERN_ERR "udf: udf_count_free failed\n");
2183                 goto out;
2184         }
2185
2186         bm = (struct spaceBitmapDesc *)bh->b_data;
2187         bytes = le32_to_cpu(bm->numOfBytes);
2188         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2189         ptr = (uint8_t *)bh->b_data;
2190
2191         while (bytes > 0) {
2192                 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2193                 accum += bitmap_weight((const unsigned long *)(ptr + index),
2194                                         cur_bytes * 8);
2195                 bytes -= cur_bytes;
2196                 if (bytes) {
2197                         brelse(bh);
2198                         newblock = udf_get_lb_pblock(sb, &loc, ++block);
2199                         bh = udf_tread(sb, newblock);
2200                         if (!bh) {
2201                                 udf_debug("read failed\n");
2202                                 goto out;
2203                         }
2204                         index = 0;
2205                         ptr = (uint8_t *)bh->b_data;
2206                 }
2207         }
2208         brelse(bh);
2209
2210 out:
2211         unlock_kernel();
2212
2213         return accum;
2214 }
2215
2216 static unsigned int udf_count_free_table(struct super_block *sb,
2217                                          struct inode *table)
2218 {
2219         unsigned int accum = 0;
2220         uint32_t elen;
2221         struct kernel_lb_addr eloc;
2222         int8_t etype;
2223         struct extent_position epos;
2224
2225         lock_kernel();
2226
2227         epos.block = UDF_I(table)->i_location;
2228         epos.offset = sizeof(struct unallocSpaceEntry);
2229         epos.bh = NULL;
2230
2231         while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2232                 accum += (elen >> table->i_sb->s_blocksize_bits);
2233
2234         brelse(epos.bh);
2235
2236         unlock_kernel();
2237
2238         return accum;
2239 }
2240
2241 static unsigned int udf_count_free(struct super_block *sb)
2242 {
2243         unsigned int accum = 0;
2244         struct udf_sb_info *sbi;
2245         struct udf_part_map *map;
2246
2247         sbi = UDF_SB(sb);
2248         if (sbi->s_lvid_bh) {
2249                 struct logicalVolIntegrityDesc *lvid =
2250                         (struct logicalVolIntegrityDesc *)
2251                         sbi->s_lvid_bh->b_data;
2252                 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
2253                         accum = le32_to_cpu(
2254                                         lvid->freeSpaceTable[sbi->s_partition]);
2255                         if (accum == 0xFFFFFFFF)
2256                                 accum = 0;
2257                 }
2258         }
2259
2260         if (accum)
2261                 return accum;
2262
2263         map = &sbi->s_partmaps[sbi->s_partition];
2264         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2265                 accum += udf_count_free_bitmap(sb,
2266                                                map->s_uspace.s_bitmap);
2267         }
2268         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
2269                 accum += udf_count_free_bitmap(sb,
2270                                                map->s_fspace.s_bitmap);
2271         }
2272         if (accum)
2273                 return accum;
2274
2275         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2276                 accum += udf_count_free_table(sb,
2277                                               map->s_uspace.s_table);
2278         }
2279         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
2280                 accum += udf_count_free_table(sb,
2281                                               map->s_fspace.s_table);
2282         }
2283
2284         return accum;
2285 }