fs/udf/super.c

   1 /*
   2  * super.c
   3  *
   4  * PURPOSE
   5  *  Super block routines for the OSTA-UDF(tm) filesystem.
   6  *
   7  * DESCRIPTION
   8  *  OSTA-UDF(tm) = Optical Storage Technology Association
   9  *  Universal Disk Format.
  10  *
  11  *  This code is based on version 2.00 of the UDF specification,
  12  *  and revision 3 of the ECMA 167 standard [equivalent to ISO 13346].
  13  *    http://www.osta.org/
  14  *    http://www.ecma.ch/
  15  *    http://www.iso.org/
  16  *
  17  * COPYRIGHT
  18  *  This file is distributed under the terms of the GNU General Public
  19  *  License (GPL). Copies of the GPL can be obtained from:
  20  *    ftp://prep.ai.mit.edu/pub/gnu/GPL
  21  *  Each contributing author retains all rights to their own work.
  22  *
  23  *  (C) 1998 Dave Boynton
  24  *  (C) 1998-2004 Ben Fennema
  25  *  (C) 2000 Stelias Computing Inc
  26  *
  27  * HISTORY
  28  *
  29  *  09/24/98 dgb  changed to allow compiling outside of kernel, and
  30  *                added some debugging.
  31  *  10/01/98 dgb  updated to allow (some) possibility of compiling w/2.0.34
  32  *  10/16/98      attempting some multi-session support
  33  *  10/17/98      added freespace count for "df"
  34  *  11/11/98 gr   added novrs option
  35  *  11/26/98 dgb  added fileset,anchor mount options
  36  *  12/06/98 blf  really hosed things royally. vat/sparing support. sequenced
  37  *                vol descs. rewrote option handling based on isofs
  38  *  12/20/98      find the free space bitmap (if it exists)
  39  */
  40
  41 #include "udfdecl.h"
  42
  43 #include <linux/blkdev.h>
  44 #include <linux/slab.h>
  45 #include <linux/kernel.h>
  46 #include <linux/module.h>
  47 #include <linux/parser.h>
  48 #include <linux/stat.h>
  49 #include <linux/cdrom.h>
  50 #include <linux/nls.h>
  51 #include <linux/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                         break;
 443                 case Opt_bs:
 444                         if (match_int(&args[0], &option))
 445                                 return 0;
 446                         uopt->blocksize = option;
 447                         break;
 448                 case Opt_unhide:
 449                         uopt->flags |= (1 << UDF_FLAG_UNHIDE);
 450                         break;
 451                 case Opt_undelete:
 452                         uopt->flags |= (1 << UDF_FLAG_UNDELETE);
 453                         break;
 454                 case Opt_noadinicb:
 455                         uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
 456                         break;
 457                 case Opt_adinicb:
 458                         uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
 459                         break;
 460                 case Opt_shortad:
 461                         uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
 462                         break;
 463                 case Opt_longad:
 464                         uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
 465                         break;
 466                 case Opt_gid:
 467                         if (match_int(args, &option))
 468                                 return 0;
 469                         uopt->gid = option;
 470                         uopt->flags |= (1 << UDF_FLAG_GID_SET);
 471                         break;
 472                 case Opt_uid:
 473                         if (match_int(args, &option))
 474                                 return 0;
 475                         uopt->uid = option;
 476                         uopt->flags |= (1 << UDF_FLAG_UID_SET);
 477                         break;
 478                 case Opt_umask:
 479                         if (match_octal(args, &option))
 480                                 return 0;
 481                         uopt->umask = option;
 482                         break;
 483                 case Opt_nostrict:
 484                         uopt->flags &= ~(1 << UDF_FLAG_STRICT);
 485                         break;
 486                 case Opt_session:
 487                         if (match_int(args, &option))
 488                                 return 0;
 489                         uopt->session = option;
 490                         if (!remount)
 491                                 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
 492                         break;
 493                 case Opt_lastblock:
 494                         if (match_int(args, &option))
 495                                 return 0;
 496                         uopt->lastblock = option;
 497                         if (!remount)
 498                                 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
 499                         break;
 500                 case Opt_anchor:
 501                         if (match_int(args, &option))
 502                                 return 0;
 503                         uopt->anchor = option;
 504                         break;
 505                 case Opt_volume:
 506                         if (match_int(args, &option))
 507                                 return 0;
 508                         uopt->volume = option;
 509                         break;
 510                 case Opt_partition:
 511                         if (match_int(args, &option))
 512                                 return 0;
 513                         uopt->partition = option;
 514                         break;
 515                 case Opt_fileset:
 516                         if (match_int(args, &option))
 517                                 return 0;
 518                         uopt->fileset = option;
 519                         break;
 520                 case Opt_rootdir:
 521                         if (match_int(args, &option))
 522                                 return 0;
 523                         uopt->rootdir = option;
 524                         break;
 525                 case Opt_utf8:
 526                         uopt->flags |= (1 << UDF_FLAG_UTF8);
 527                         break;
 528 #ifdef CONFIG_UDF_NLS
 529                 case Opt_iocharset:
 530                         uopt->nls_map = load_nls(args[0].from);
 531                         uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
 532                         break;
 533 #endif
 534                 case Opt_uignore:
 535                         uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
 536                         break;
 537                 case Opt_uforget:
 538                         uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
 539                         break;
 540                 case Opt_gignore:
 541                         uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
 542                         break;
 543                 case Opt_gforget:
 544                         uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
 545                         break;
 546                 case Opt_fmode:
 547                         if (match_octal(args, &option))
 548                                 return 0;
 549                         uopt->fmode = option & 0777;
 550                         break;
 551                 case Opt_dmode:
 552                         if (match_octal(args, &option))
 553                                 return 0;
 554                         uopt->dmode = option & 0777;
 555                         break;
 556                 default:
 557                         printk(KERN_ERR "udf: bad mount option \"%s\" "
 558                                "or missing value\n", p);
 559                         return 0;
 560                 }
 561         }
 562         return 1;
 563 }
 564
 565 static void udf_write_super(struct super_block *sb)
 566 {
 567         lock_kernel();
 568
 569         if (!(sb->s_flags & MS_RDONLY))
 570                 udf_open_lvid(sb);
 571         sb->s_dirt = 0;
 572
 573         unlock_kernel();
 574 }
 575
 576 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
 577 {
 578         struct udf_options uopt;
 579         struct udf_sb_info *sbi = UDF_SB(sb);
 580
 581         uopt.flags = sbi->s_flags;
 582         uopt.uid   = sbi->s_uid;
 583         uopt.gid   = sbi->s_gid;
 584         uopt.umask = sbi->s_umask;
 585         uopt.fmode = sbi->s_fmode;
 586         uopt.dmode = sbi->s_dmode;
 587
 588         if (!udf_parse_options(options, &uopt, true))
 589                 return -EINVAL;
 590
 591         sbi->s_flags = uopt.flags;
 592         sbi->s_uid   = uopt.uid;
 593         sbi->s_gid   = uopt.gid;
 594         sbi->s_umask = uopt.umask;
 595         sbi->s_fmode = uopt.fmode;
 596         sbi->s_dmode = uopt.dmode;
 597
 598         if (sbi->s_lvid_bh) {
 599                 int write_rev = le16_to_cpu(udf_sb_lvidiu(sbi)->minUDFWriteRev);
 600                 if (write_rev > UDF_MAX_WRITE_VERSION)
 601                         *flags |= MS_RDONLY;
 602         }
 603
 604         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 605                 return 0;
 606         if (*flags & MS_RDONLY)
 607                 udf_close_lvid(sb);
 608         else
 609                 udf_open_lvid(sb);
 610
 611         return 0;
 612 }
 613
 614 static int udf_vrs(struct super_block *sb, int silent)
 615 {
 616         struct volStructDesc *vsd = NULL;
 617         loff_t sector = 32768;
 618         int sectorsize;
 619         struct buffer_head *bh = NULL;
 620         int iso9660 = 0;
 621         int nsr02 = 0;
 622         int nsr03 = 0;
 623         struct udf_sb_info *sbi;
 624
 625         /* Block size must be a multiple of 512 */
 626         if (sb->s_blocksize & 511)
 627                 return 0;
 628         sbi = UDF_SB(sb);
 629
 630         if (sb->s_blocksize < sizeof(struct volStructDesc))
 631                 sectorsize = sizeof(struct volStructDesc);
 632         else
 633                 sectorsize = sb->s_blocksize;
 634
 635         sector += (sbi->s_session << sb->s_blocksize_bits);
 636
 637         udf_debug("Starting at sector %u (%ld byte sectors)\n",
 638                   (unsigned int)(sector >> sb->s_blocksize_bits),
 639                   sb->s_blocksize);
 640         /* Process the sequence (if applicable) */
 641         for (; !nsr02 && !nsr03; sector += sectorsize) {
 642                 /* Read a block */
 643                 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
 644                 if (!bh)
 645                         break;
 646
 647                 /* Look for ISO  descriptors */
 648                 vsd = (struct volStructDesc *)(bh->b_data +
 649                                               (sector & (sb->s_blocksize - 1)));
 650
 651                 if (vsd->stdIdent[0] == 0) {
 652                         brelse(bh);
 653                         break;
 654                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
 655                                     VSD_STD_ID_LEN)) {
 656                         iso9660 = sector;
 657                         switch (vsd->structType) {
 658                         case 0:
 659                                 udf_debug("ISO9660 Boot Record found\n");
 660                                 break;
 661                         case 1:
 662                                 udf_debug("ISO9660 Primary Volume Descriptor "
 663                                           "found\n");
 664                                 break;
 665                         case 2:
 666                                 udf_debug("ISO9660 Supplementary Volume "
 667                                           "Descriptor found\n");
 668                                 break;
 669                         case 3:
 670                                 udf_debug("ISO9660 Volume Partition Descriptor "
 671                                           "found\n");
 672                                 break;
 673                         case 255:
 674                                 udf_debug("ISO9660 Volume Descriptor Set "
 675                                           "Terminator found\n");
 676                                 break;
 677                         default:
 678                                 udf_debug("ISO9660 VRS (%u) found\n",
 679                                           vsd->structType);
 680                                 break;
 681                         }
 682                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
 683                                     VSD_STD_ID_LEN))
 684                         ; /* nothing */
 685                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
 686                                     VSD_STD_ID_LEN)) {
 687                         brelse(bh);
 688                         break;
 689                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
 690                                     VSD_STD_ID_LEN))
 691                         nsr02 = sector;
 692                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
 693                                     VSD_STD_ID_LEN))
 694                         nsr03 = sector;
 695                 brelse(bh);
 696         }
 697
 698         if (nsr03)
 699                 return nsr03;
 700         else if (nsr02)
 701                 return nsr02;
 702         else if (sector - (sbi->s_session << sb->s_blocksize_bits) == 32768)
 703                 return -1;
 704         else
 705                 return 0;
 706 }
 707
 708 /*
 709  * Check whether there is an anchor block in the given block
 710  */
 711 static int udf_check_anchor_block(struct super_block *sb, sector_t block)
 712 {
 713         struct buffer_head *bh;
 714         uint16_t ident;
 715
 716         if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
 717             udf_fixed_to_variable(block) >=
 718             sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits)
 719                 return 0;
 720
 721         bh = udf_read_tagged(sb, block, block, &ident);
 722         if (!bh)
 723                 return 0;
 724         brelse(bh);
 725
 726         return ident == TAG_IDENT_AVDP;
 727 }
 728
 729 /* Search for an anchor volume descriptor pointer */
 730 static sector_t udf_scan_anchors(struct super_block *sb, sector_t lastblock)
 731 {
 732         sector_t last[6];
 733         int i;
 734         struct udf_sb_info *sbi = UDF_SB(sb);
 735         int last_count = 0;
 736
 737         last[last_count++] = lastblock;
 738         if (lastblock >= 1)
 739                 last[last_count++] = lastblock - 1;
 740         last[last_count++] = lastblock + 1;
 741         if (lastblock >= 2)
 742                 last[last_count++] = lastblock - 2;
 743         if (lastblock >= 150)
 744                 last[last_count++] = lastblock - 150;
 745         if (lastblock >= 152)
 746                 last[last_count++] = lastblock - 152;
 747
 748         /*  according to spec, anchor is in either:
 749          *     block 256
 750          *     lastblock-256
 751          *     lastblock
 752          *  however, if the disc isn't closed, it could be 512 */
 753
 754         for (i = 0; i < last_count; i++) {
 755                 if (last[i] >= sb->s_bdev->bd_inode->i_size >>
 756                                 sb->s_blocksize_bits)
 757                         continue;
 758
 759                 if (udf_check_anchor_block(sb, last[i])) {
 760                         sbi->s_anchor[0] = last[i];
 761                         sbi->s_anchor[1] = last[i] - 256;
 762                         return last[i];
 763                 }
 764
 765                 if (last[i] < 256)
 766                         continue;
 767
 768                 if (udf_check_anchor_block(sb, last[i] - 256)) {
 769                         sbi->s_anchor[1] = last[i] - 256;
 770                         return last[i];
 771                 }
 772         }
 773
 774         if (udf_check_anchor_block(sb, sbi->s_session + 256)) {
 775                 sbi->s_anchor[0] = sbi->s_session + 256;
 776                 return last[0];
 777         }
 778         if (udf_check_anchor_block(sb, sbi->s_session + 512)) {
 779                 sbi->s_anchor[0] = sbi->s_session + 512;
 780                 return last[0];
 781         }
 782         return 0;
 783 }
 784
 785 /*
 786  * Find an anchor volume descriptor. The function expects sbi->s_lastblock to
 787  * be the last block on the media.
 788  *
 789  * Return 1 if not found, 0 if ok
 790  *
 791  */
 792 static void udf_find_anchor(struct super_block *sb)
 793 {
 794         sector_t lastblock;
 795         struct buffer_head *bh = NULL;
 796         uint16_t ident;
 797         int i;
 798         struct udf_sb_info *sbi = UDF_SB(sb);
 799
 800         lastblock = udf_scan_anchors(sb, sbi->s_last_block);
 801         if (lastblock)
 802                 goto check_anchor;
 803
 804         /* No anchor found? Try VARCONV conversion of block numbers */
 805         UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
 806         /* Firstly, we try to not convert number of the last block */
 807         lastblock = udf_scan_anchors(sb,
 808                                 udf_variable_to_fixed(sbi->s_last_block));
 809         if (lastblock)
 810                 goto check_anchor;
 811
 812         /* Secondly, we try with converted number of the last block */
 813         lastblock = udf_scan_anchors(sb, sbi->s_last_block);
 814         if (!lastblock) {
 815                 /* VARCONV didn't help. Clear it. */
 816                 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
 817         }
 818
 819 check_anchor:
 820         /*
 821          * Check located anchors and the anchor block supplied via
 822          * mount options
 823          */
 824         for (i = 0; i < ARRAY_SIZE(sbi->s_anchor); i++) {
 825                 if (!sbi->s_anchor[i])
 826                         continue;
 827                 bh = udf_read_tagged(sb, sbi->s_anchor[i],
 828                                         sbi->s_anchor[i], &ident);
 829                 if (!bh)
 830                         sbi->s_anchor[i] = 0;
 831                 else {
 832                         brelse(bh);
 833                         if (ident != TAG_IDENT_AVDP)
 834                                 sbi->s_anchor[i] = 0;
 835                 }
 836         }
 837
 838         sbi->s_last_block = lastblock;
 839 }
 840
 841 static int udf_find_fileset(struct super_block *sb,
 842                             struct kernel_lb_addr *fileset,
 843                             struct kernel_lb_addr *root)
 844 {
 845         struct buffer_head *bh = NULL;
 846         long lastblock;
 847         uint16_t ident;
 848         struct udf_sb_info *sbi;
 849
 850         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
 851             fileset->partitionReferenceNum != 0xFFFF) {
 852                 bh = udf_read_ptagged(sb, fileset, 0, &ident);
 853
 854                 if (!bh) {
 855                         return 1;
 856                 } else if (ident != TAG_IDENT_FSD) {
 857                         brelse(bh);
 858                         return 1;
 859                 }
 860
 861         }
 862
 863         sbi = UDF_SB(sb);
 864         if (!bh) {
 865                 /* Search backwards through the partitions */
 866                 struct kernel_lb_addr newfileset;
 867
 868 /* --> cvg: FIXME - is it reasonable? */
 869                 return 1;
 870
 871                 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
 872                      (newfileset.partitionReferenceNum != 0xFFFF &&
 873                       fileset->logicalBlockNum == 0xFFFFFFFF &&
 874                       fileset->partitionReferenceNum == 0xFFFF);
 875                      newfileset.partitionReferenceNum--) {
 876                         lastblock = sbi->s_partmaps
 877                                         [newfileset.partitionReferenceNum]
 878                                                 .s_partition_len;
 879                         newfileset.logicalBlockNum = 0;
 880
 881                         do {
 882                                 bh = udf_read_ptagged(sb, &newfileset, 0,
 883                                                       &ident);
 884                                 if (!bh) {
 885                                         newfileset.logicalBlockNum++;
 886                                         continue;
 887                                 }
 888
 889                                 switch (ident) {
 890                                 case TAG_IDENT_SBD:
 891                                 {
 892                                         struct spaceBitmapDesc *sp;
 893                                         sp = (struct spaceBitmapDesc *)
 894                                                                 bh->b_data;
 895                                         newfileset.logicalBlockNum += 1 +
 896                                                 ((le32_to_cpu(sp->numOfBytes) +
 897                                                   sizeof(struct spaceBitmapDesc)
 898                                                   - 1) >> sb->s_blocksize_bits);
 899                                         brelse(bh);
 900                                         break;
 901                                 }
 902                                 case TAG_IDENT_FSD:
 903                                         *fileset = newfileset;
 904                                         break;
 905                                 default:
 906                                         newfileset.logicalBlockNum++;
 907                                         brelse(bh);
 908                                         bh = NULL;
 909                                         break;
 910                                 }
 911                         } while (newfileset.logicalBlockNum < lastblock &&
 912                                  fileset->logicalBlockNum == 0xFFFFFFFF &&
 913                                  fileset->partitionReferenceNum == 0xFFFF);
 914                 }
 915         }
 916
 917         if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
 918              fileset->partitionReferenceNum != 0xFFFF) && bh) {
 919                 udf_debug("Fileset at block=%d, partition=%d\n",
 920                           fileset->logicalBlockNum,
 921                           fileset->partitionReferenceNum);
 922
 923                 sbi->s_partition = fileset->partitionReferenceNum;
 924                 udf_load_fileset(sb, bh, root);
 925                 brelse(bh);
 926                 return 0;
 927         }
 928         return 1;
 929 }
 930
 931 static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
 932 {
 933         struct primaryVolDesc *pvoldesc;
 934         struct ustr *instr, *outstr;
 935         struct buffer_head *bh;
 936         uint16_t ident;
 937         int ret = 1;
 938
 939         instr = kmalloc(sizeof(struct ustr), GFP_NOFS);
 940         if (!instr)
 941                 return 1;
 942
 943         outstr = kmalloc(sizeof(struct ustr), GFP_NOFS);
 944         if (!outstr)
 945                 goto out1;
 946
 947         bh = udf_read_tagged(sb, block, block, &ident);
 948         if (!bh)
 949                 goto out2;
 950
 951         BUG_ON(ident != TAG_IDENT_PVD);
 952
 953         pvoldesc = (struct primaryVolDesc *)bh->b_data;
 954
 955         if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
 956                               pvoldesc->recordingDateAndTime)) {
 957 #ifdef UDFFS_DEBUG
 958                 struct timestamp *ts = &pvoldesc->recordingDateAndTime;
 959                 udf_debug("recording time %04u/%02u/%02u"
 960                           " %02u:%02u (%x)\n",
 961                           le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
 962                           ts->minute, le16_to_cpu(ts->typeAndTimezone));
 963 #endif
 964         }
 965
 966         if (!udf_build_ustr(instr, pvoldesc->volIdent, 32))
 967                 if (udf_CS0toUTF8(outstr, instr)) {
 968                         strncpy(UDF_SB(sb)->s_volume_ident, outstr->u_name,
 969                                 outstr->u_len > 31 ? 31 : outstr->u_len);
 970                         udf_debug("volIdent[] = '%s'\n",
 971                                         UDF_SB(sb)->s_volume_ident);
 972                 }
 973
 974         if (!udf_build_ustr(instr, pvoldesc->volSetIdent, 128))
 975                 if (udf_CS0toUTF8(outstr, instr))
 976                         udf_debug("volSetIdent[] = '%s'\n", outstr->u_name);
 977
 978         brelse(bh);
 979         ret = 0;
 980 out2:
 981         kfree(outstr);
 982 out1:
 983         kfree(instr);
 984         return ret;
 985 }
 986
 987 static int udf_load_metadata_files(struct super_block *sb, int partition)
 988 {
 989         struct udf_sb_info *sbi = UDF_SB(sb);
 990         struct udf_part_map *map;
 991         struct udf_meta_data *mdata;
 992         struct kernel_lb_addr addr;
 993         int fe_error = 0;
 994
 995         map = &sbi->s_partmaps[partition];
 996         mdata = &map->s_type_specific.s_metadata;
 997
 998         /* metadata address */
 999         addr.logicalBlockNum =  mdata->s_meta_file_loc;
1000         addr.partitionReferenceNum = map->s_partition_num;
1001
1002         udf_debug("Metadata file location: block = %d part = %d\n",
1003                           addr.logicalBlockNum, addr.partitionReferenceNum);
1004
1005         mdata->s_metadata_fe = udf_iget(sb, &addr);
1006
1007         if (mdata->s_metadata_fe == NULL) {
1008                 udf_warning(sb, __func__, "metadata inode efe not found, "
1009                                 "will try mirror inode.");
1010                 fe_error = 1;
1011         } else if (UDF_I(mdata->s_metadata_fe)->i_alloc_type !=
1012                  ICBTAG_FLAG_AD_SHORT) {
1013                 udf_warning(sb, __func__, "metadata inode efe does not have "
1014                         "short allocation descriptors!");
1015                 fe_error = 1;
1016                 iput(mdata->s_metadata_fe);
1017                 mdata->s_metadata_fe = NULL;
1018         }
1019
1020         /* mirror file entry */
1021         addr.logicalBlockNum = mdata->s_mirror_file_loc;
1022         addr.partitionReferenceNum = map->s_partition_num;
1023
1024         udf_debug("Mirror metadata file location: block = %d part = %d\n",
1025                           addr.logicalBlockNum, addr.partitionReferenceNum);
1026
1027         mdata->s_mirror_fe = udf_iget(sb, &addr);
1028
1029         if (mdata->s_mirror_fe == NULL) {
1030                 if (fe_error) {
1031                         udf_error(sb, __func__, "mirror inode efe not found "
1032                         "and metadata inode is missing too, exiting...");
1033                         goto error_exit;
1034                 } else
1035                         udf_warning(sb, __func__, "mirror inode efe not found,"
1036                                         " but metadata inode is OK");
1037         } else if (UDF_I(mdata->s_mirror_fe)->i_alloc_type !=
1038                  ICBTAG_FLAG_AD_SHORT) {
1039                 udf_warning(sb, __func__, "mirror inode efe does not have "
1040                         "short allocation descriptors!");
1041                 iput(mdata->s_mirror_fe);
1042                 mdata->s_mirror_fe = NULL;
1043                 if (fe_error)
1044                         goto error_exit;
1045         }
1046
1047         /*
1048          * bitmap file entry
1049          * Note:
1050          * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
1051         */
1052         if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
1053                 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
1054                 addr.partitionReferenceNum = map->s_partition_num;
1055
1056                 udf_debug("Bitmap file location: block = %d part = %d\n",
1057                         addr.logicalBlockNum, addr.partitionReferenceNum);
1058
1059                 mdata->s_bitmap_fe = udf_iget(sb, &addr);
1060
1061                 if (mdata->s_bitmap_fe == NULL) {
1062                         if (sb->s_flags & MS_RDONLY)
1063                                 udf_warning(sb, __func__, "bitmap inode efe "
1064                                         "not found but it's ok since the disc"
1065                                         " is mounted read-only");
1066                         else {
1067                                 udf_error(sb, __func__, "bitmap inode efe not "
1068                                         "found and attempted read-write mount");
1069                                 goto error_exit;
1070                         }
1071                 }
1072         }
1073
1074         udf_debug("udf_load_metadata_files Ok\n");
1075
1076         return 0;
1077
1078 error_exit:
1079         return 1;
1080 }
1081
1082 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
1083                              struct kernel_lb_addr *root)
1084 {
1085         struct fileSetDesc *fset;
1086
1087         fset = (struct fileSetDesc *)bh->b_data;
1088
1089         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
1090
1091         UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
1092
1093         udf_debug("Rootdir at block=%d, partition=%d\n",
1094                   root->logicalBlockNum, root->partitionReferenceNum);
1095 }
1096
1097 int udf_compute_nr_groups(struct super_block *sb, u32 partition)
1098 {
1099         struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
1100         return DIV_ROUND_UP(map->s_partition_len +
1101                             (sizeof(struct spaceBitmapDesc) << 3),
1102                             sb->s_blocksize * 8);
1103 }
1104
1105 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
1106 {
1107         struct udf_bitmap *bitmap;
1108         int nr_groups;
1109         int size;
1110
1111         nr_groups = udf_compute_nr_groups(sb, index);
1112         size = sizeof(struct udf_bitmap) +
1113                 (sizeof(struct buffer_head *) * nr_groups);
1114
1115         if (size <= PAGE_SIZE)
1116                 bitmap = kmalloc(size, GFP_KERNEL);
1117         else
1118                 bitmap = vmalloc(size); /* TODO: get rid of vmalloc */
1119
1120         if (bitmap == NULL) {
1121                 udf_error(sb, __func__,
1122                           "Unable to allocate space for bitmap "
1123                           "and %d buffer_head pointers", nr_groups);
1124                 return NULL;
1125         }
1126
1127         memset(bitmap, 0x00, size);
1128         bitmap->s_block_bitmap = (struct buffer_head **)(bitmap + 1);
1129         bitmap->s_nr_groups = nr_groups;
1130         return bitmap;
1131 }
1132
1133 static int udf_fill_partdesc_info(struct super_block *sb,
1134                 struct partitionDesc *p, int p_index)
1135 {
1136         struct udf_part_map *map;
1137         struct udf_sb_info *sbi = UDF_SB(sb);
1138         struct partitionHeaderDesc *phd;
1139
1140         map = &sbi->s_partmaps[p_index];
1141
1142         map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
1143         map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
1144
1145         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
1146                 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
1147         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
1148                 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
1149         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
1150                 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
1151         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
1152                 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
1153
1154         udf_debug("Partition (%d type %x) starts at physical %d, "
1155                   "block length %d\n", p_index,
1156                   map->s_partition_type, map->s_partition_root,
1157                   map->s_partition_len);
1158
1159         if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1160             strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
1161                 return 0;
1162
1163         phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1164         if (phd->unallocSpaceTable.extLength) {
1165                 struct kernel_lb_addr loc = {
1166                         .logicalBlockNum = le32_to_cpu(
1167                                 phd->unallocSpaceTable.extPosition),
1168                         .partitionReferenceNum = p_index,
1169                 };
1170
1171                 map->s_uspace.s_table = udf_iget(sb, &loc);
1172                 if (!map->s_uspace.s_table) {
1173                         udf_debug("cannot load unallocSpaceTable (part %d)\n",
1174                                         p_index);
1175                         return 1;
1176                 }
1177                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1178                 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
1179                                 p_index, map->s_uspace.s_table->i_ino);
1180         }
1181
1182         if (phd->unallocSpaceBitmap.extLength) {
1183                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1184                 if (!bitmap)
1185                         return 1;
1186                 map->s_uspace.s_bitmap = bitmap;
1187                 bitmap->s_extLength = le32_to_cpu(
1188                                 phd->unallocSpaceBitmap.extLength);
1189                 bitmap->s_extPosition = le32_to_cpu(
1190                                 phd->unallocSpaceBitmap.extPosition);
1191                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1192                 udf_debug("unallocSpaceBitmap (part %d) @ %d\n", p_index,
1193                                                 bitmap->s_extPosition);
1194         }
1195
1196         if (phd->partitionIntegrityTable.extLength)
1197                 udf_debug("partitionIntegrityTable (part %d)\n", p_index);
1198
1199         if (phd->freedSpaceTable.extLength) {
1200                 struct kernel_lb_addr loc = {
1201                         .logicalBlockNum = le32_to_cpu(
1202                                 phd->freedSpaceTable.extPosition),
1203                         .partitionReferenceNum = p_index,
1204                 };
1205
1206                 map->s_fspace.s_table = udf_iget(sb, &loc);
1207                 if (!map->s_fspace.s_table) {
1208                         udf_debug("cannot load freedSpaceTable (part %d)\n",
1209                                 p_index);
1210                         return 1;
1211                 }
1212
1213                 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
1214                 udf_debug("freedSpaceTable (part %d) @ %ld\n",
1215                                 p_index, map->s_fspace.s_table->i_ino);
1216         }
1217
1218         if (phd->freedSpaceBitmap.extLength) {
1219                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1220                 if (!bitmap)
1221                         return 1;
1222                 map->s_fspace.s_bitmap = bitmap;
1223                 bitmap->s_extLength = le32_to_cpu(
1224                                 phd->freedSpaceBitmap.extLength);
1225                 bitmap->s_extPosition = le32_to_cpu(
1226                                 phd->freedSpaceBitmap.extPosition);
1227                 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1228                 udf_debug("freedSpaceBitmap (part %d) @ %d\n", p_index,
1229                                         bitmap->s_extPosition);
1230         }
1231         return 0;
1232 }
1233
1234 static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1235 {
1236         struct udf_sb_info *sbi = UDF_SB(sb);
1237         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1238         struct kernel_lb_addr ino;
1239         struct buffer_head *bh = NULL;
1240         struct udf_inode_info *vati;
1241         uint32_t pos;
1242         struct virtualAllocationTable20 *vat20;
1243
1244         /* VAT file entry is in the last recorded block */
1245         ino.partitionReferenceNum = type1_index;
1246         ino.logicalBlockNum = sbi->s_last_block - map->s_partition_root;
1247         sbi->s_vat_inode = udf_iget(sb, &ino);
1248         if (!sbi->s_vat_inode)
1249                 return 1;
1250
1251         if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1252                 map->s_type_specific.s_virtual.s_start_offset = 0;
1253                 map->s_type_specific.s_virtual.s_num_entries =
1254                         (sbi->s_vat_inode->i_size - 36) >> 2;
1255         } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1256                 vati = UDF_I(sbi->s_vat_inode);
1257                 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1258                         pos = udf_block_map(sbi->s_vat_inode, 0);
1259                         bh = sb_bread(sb, pos);
1260                         if (!bh)
1261                                 return 1;
1262                         vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1263                 } else {
1264                         vat20 = (struct virtualAllocationTable20 *)
1265                                                         vati->i_ext.i_data;
1266                 }
1267
1268                 map->s_type_specific.s_virtual.s_start_offset =
1269                         le16_to_cpu(vat20->lengthHeader);
1270                 map->s_type_specific.s_virtual.s_num_entries =
1271                         (sbi->s_vat_inode->i_size -
1272                                 map->s_type_specific.s_virtual.
1273                                         s_start_offset) >> 2;
1274                 brelse(bh);
1275         }
1276         return 0;
1277 }
1278
1279 static int udf_load_partdesc(struct super_block *sb, sector_t block)
1280 {
1281         struct buffer_head *bh;
1282         struct partitionDesc *p;
1283         struct udf_part_map *map;
1284         struct udf_sb_info *sbi = UDF_SB(sb);
1285         int i, type1_idx;
1286         uint16_t partitionNumber;
1287         uint16_t ident;
1288         int ret = 0;
1289
1290         bh = udf_read_tagged(sb, block, block, &ident);
1291         if (!bh)
1292                 return 1;
1293         if (ident != TAG_IDENT_PD)
1294                 goto out_bh;
1295
1296         p = (struct partitionDesc *)bh->b_data;
1297         partitionNumber = le16_to_cpu(p->partitionNumber);
1298
1299         /* First scan for TYPE1, SPARABLE and METADATA partitions */
1300         for (i = 0; i < sbi->s_partitions; i++) {
1301                 map = &sbi->s_partmaps[i];
1302                 udf_debug("Searching map: (%d == %d)\n",
1303                           map->s_partition_num, partitionNumber);
1304                 if (map->s_partition_num == partitionNumber &&
1305                     (map->s_partition_type == UDF_TYPE1_MAP15 ||
1306                      map->s_partition_type == UDF_SPARABLE_MAP15))
1307                         break;
1308         }
1309
1310         if (i >= sbi->s_partitions) {
1311                 udf_debug("Partition (%d) not found in partition map\n",
1312                           partitionNumber);
1313                 goto out_bh;
1314         }
1315
1316         ret = udf_fill_partdesc_info(sb, p, i);
1317
1318         /*
1319          * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1320          * PHYSICAL partitions are already set up
1321          */
1322         type1_idx = i;
1323         for (i = 0; i < sbi->s_partitions; i++) {
1324                 map = &sbi->s_partmaps[i];
1325
1326                 if (map->s_partition_num == partitionNumber &&
1327                     (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1328                      map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1329                      map->s_partition_type == UDF_METADATA_MAP25))
1330                         break;
1331         }
1332
1333         if (i >= sbi->s_partitions)
1334                 goto out_bh;
1335
1336         ret = udf_fill_partdesc_info(sb, p, i);
1337         if (ret)
1338                 goto out_bh;
1339
1340         if (map->s_partition_type == UDF_METADATA_MAP25) {
1341                 ret = udf_load_metadata_files(sb, i);
1342                 if (ret) {
1343                         printk(KERN_ERR "UDF-fs: error loading MetaData "
1344                         "partition map %d\n", i);
1345                         goto out_bh;
1346                 }
1347         } else {
1348                 ret = udf_load_vat(sb, i, type1_idx);
1349                 if (ret)
1350                         goto out_bh;
1351                 /*
1352                  * Mark filesystem read-only if we have a partition with
1353                  * virtual map since we don't handle writing to it (we
1354                  * overwrite blocks instead of relocating them).
1355                  */
1356                 sb->s_flags |= MS_RDONLY;
1357                 printk(KERN_NOTICE "UDF-fs: Filesystem marked read-only "
1358                         "because writing to pseudooverwrite partition is "
1359                         "not implemented.\n");
1360         }
1361 out_bh:
1362         /* In case loading failed, we handle cleanup in udf_fill_super */
1363         brelse(bh);
1364         return ret;
1365 }
1366
1367 static int udf_load_logicalvol(struct super_block *sb, sector_t block,
1368                                struct kernel_lb_addr *fileset)
1369 {
1370         struct logicalVolDesc *lvd;
1371         int i, j, offset;
1372         uint8_t type;
1373         struct udf_sb_info *sbi = UDF_SB(sb);
1374         struct genericPartitionMap *gpm;
1375         uint16_t ident;
1376         struct buffer_head *bh;
1377         int ret = 0;
1378
1379         bh = udf_read_tagged(sb, block, block, &ident);
1380         if (!bh)
1381                 return 1;
1382         BUG_ON(ident != TAG_IDENT_LVD);
1383         lvd = (struct logicalVolDesc *)bh->b_data;
1384
1385         i = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1386         if (i != 0) {
1387                 ret = i;
1388                 goto out_bh;
1389         }
1390
1391         for (i = 0, offset = 0;
1392              i < sbi->s_partitions && offset < le32_to_cpu(lvd->mapTableLength);
1393              i++, offset += gpm->partitionMapLength) {
1394                 struct udf_part_map *map = &sbi->s_partmaps[i];
1395                 gpm = (struct genericPartitionMap *)
1396                                 &(lvd->partitionMaps[offset]);
1397                 type = gpm->partitionMapType;
1398                 if (type == 1) {
1399                         struct genericPartitionMap1 *gpm1 =
1400                                 (struct genericPartitionMap1 *)gpm;
1401                         map->s_partition_type = UDF_TYPE1_MAP15;
1402                         map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1403                         map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1404                         map->s_partition_func = NULL;
1405                 } else if (type == 2) {
1406                         struct udfPartitionMap2 *upm2 =
1407                                                 (struct udfPartitionMap2 *)gpm;
1408                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1409                                                 strlen(UDF_ID_VIRTUAL))) {
1410                                 u16 suf =
1411                                         le16_to_cpu(((__le16 *)upm2->partIdent.
1412                                                         identSuffix)[0]);
1413                                 if (suf < 0x0200) {
1414                                         map->s_partition_type =
1415                                                         UDF_VIRTUAL_MAP15;
1416                                         map->s_partition_func =
1417                                                         udf_get_pblock_virt15;
1418                                 } else {
1419                                         map->s_partition_type =
1420                                                         UDF_VIRTUAL_MAP20;
1421                                         map->s_partition_func =
1422                                                         udf_get_pblock_virt20;
1423                                 }
1424                         } else if (!strncmp(upm2->partIdent.ident,
1425                                                 UDF_ID_SPARABLE,
1426                                                 strlen(UDF_ID_SPARABLE))) {
1427                                 uint32_t loc;
1428                                 struct sparingTable *st;
1429                                 struct sparablePartitionMap *spm =
1430                                         (struct sparablePartitionMap *)gpm;
1431
1432                                 map->s_partition_type = UDF_SPARABLE_MAP15;
1433                                 map->s_type_specific.s_sparing.s_packet_len =
1434                                                 le16_to_cpu(spm->packetLength);
1435                                 for (j = 0; j < spm->numSparingTables; j++) {
1436                                         struct buffer_head *bh2;
1437
1438                                         loc = le32_to_cpu(
1439                                                 spm->locSparingTable[j]);
1440                                         bh2 = udf_read_tagged(sb, loc, loc,
1441                                                              &ident);
1442                                         map->s_type_specific.s_sparing.
1443                                                         s_spar_map[j] = bh2;
1444
1445                                         if (bh2 == NULL)
1446                                                 continue;
1447
1448                                         st = (struct sparingTable *)bh2->b_data;
1449                                         if (ident != 0 || strncmp(
1450                                                 st->sparingIdent.ident,
1451                                                 UDF_ID_SPARING,
1452                                                 strlen(UDF_ID_SPARING))) {
1453                                                 brelse(bh2);
1454                                                 map->s_type_specific.s_sparing.
1455                                                         s_spar_map[j] = NULL;
1456                                         }
1457                                 }
1458                                 map->s_partition_func = udf_get_pblock_spar15;
1459                         } else if (!strncmp(upm2->partIdent.ident,
1460                                                 UDF_ID_METADATA,
1461                                                 strlen(UDF_ID_METADATA))) {
1462                                 struct udf_meta_data *mdata =
1463                                         &map->s_type_specific.s_metadata;
1464                                 struct metadataPartitionMap *mdm =
1465                                                 (struct metadataPartitionMap *)
1466                                                 &(lvd->partitionMaps[offset]);
1467                                 udf_debug("Parsing Logical vol part %d "
1468                                         "type %d  id=%s\n", i, type,
1469                                         UDF_ID_METADATA);
1470
1471                                 map->s_partition_type = UDF_METADATA_MAP25;
1472                                 map->s_partition_func = udf_get_pblock_meta25;
1473
1474                                 mdata->s_meta_file_loc   =
1475                                         le32_to_cpu(mdm->metadataFileLoc);
1476                                 mdata->s_mirror_file_loc =
1477                                         le32_to_cpu(mdm->metadataMirrorFileLoc);
1478                                 mdata->s_bitmap_file_loc =
1479                                         le32_to_cpu(mdm->metadataBitmapFileLoc);
1480                                 mdata->s_alloc_unit_size =
1481                                         le32_to_cpu(mdm->allocUnitSize);
1482                                 mdata->s_align_unit_size =
1483                                         le16_to_cpu(mdm->alignUnitSize);
1484                                 mdata->s_dup_md_flag     =
1485                                         mdm->flags & 0x01;
1486
1487                                 udf_debug("Metadata Ident suffix=0x%x\n",
1488                                         (le16_to_cpu(
1489                                          ((__le16 *)
1490                                               mdm->partIdent.identSuffix)[0])));
1491                                 udf_debug("Metadata part num=%d\n",
1492                                         le16_to_cpu(mdm->partitionNum));
1493                                 udf_debug("Metadata part alloc unit size=%d\n",
1494                                         le32_to_cpu(mdm->allocUnitSize));
1495                                 udf_debug("Metadata file loc=%d\n",
1496                                         le32_to_cpu(mdm->metadataFileLoc));
1497                                 udf_debug("Mirror file loc=%d\n",
1498                                        le32_to_cpu(mdm->metadataMirrorFileLoc));
1499                                 udf_debug("Bitmap file loc=%d\n",
1500                                        le32_to_cpu(mdm->metadataBitmapFileLoc));
1501                                 udf_debug("Duplicate Flag: %d %d\n",
1502                                         mdata->s_dup_md_flag, mdm->flags);
1503                         } else {
1504                                 udf_debug("Unknown ident: %s\n",
1505                                           upm2->partIdent.ident);
1506                                 continue;
1507                         }
1508                         map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1509                         map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1510                 }
1511                 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1512                           i, map->s_partition_num, type,
1513                           map->s_volumeseqnum);
1514         }
1515
1516         if (fileset) {
1517                 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
1518
1519                 *fileset = lelb_to_cpu(la->extLocation);
1520                 udf_debug("FileSet found in LogicalVolDesc at block=%d, "
1521                           "partition=%d\n", fileset->logicalBlockNum,
1522                           fileset->partitionReferenceNum);
1523         }
1524         if (lvd->integritySeqExt.extLength)
1525                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1526
1527 out_bh:
1528         brelse(bh);
1529         return ret;
1530 }
1531
1532 /*
1533  * udf_load_logicalvolint
1534  *
1535  */
1536 static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
1537 {
1538         struct buffer_head *bh = NULL;
1539         uint16_t ident;
1540         struct udf_sb_info *sbi = UDF_SB(sb);
1541         struct logicalVolIntegrityDesc *lvid;
1542
1543         while (loc.extLength > 0 &&
1544                (bh = udf_read_tagged(sb, loc.extLocation,
1545                                      loc.extLocation, &ident)) &&
1546                ident == TAG_IDENT_LVID) {
1547                 sbi->s_lvid_bh = bh;
1548                 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1549
1550                 if (lvid->nextIntegrityExt.extLength)
1551                         udf_load_logicalvolint(sb,
1552                                 leea_to_cpu(lvid->nextIntegrityExt));
1553
1554                 if (sbi->s_lvid_bh != bh)
1555                         brelse(bh);
1556                 loc.extLength -= sb->s_blocksize;
1557                 loc.extLocation++;
1558         }
1559         if (sbi->s_lvid_bh != bh)
1560                 brelse(bh);
1561 }
1562
1563 /*
1564  * udf_process_sequence
1565  *
1566  * PURPOSE
1567  *      Process a main/reserve volume descriptor sequence.
1568  *
1569  * PRE-CONDITIONS
1570  *      sb                      Pointer to _locked_ superblock.
1571  *      block                   First block of first extent of the sequence.
1572  *      lastblock               Lastblock of first extent of the sequence.
1573  *
1574  * HISTORY
1575  *      July 1, 1997 - Andrew E. Mileski
1576  *      Written, tested, and released.
1577  */
1578 static noinline int udf_process_sequence(struct super_block *sb, long block,
1579                                 long lastblock, struct kernel_lb_addr *fileset)
1580 {
1581         struct buffer_head *bh = NULL;
1582         struct udf_vds_record vds[VDS_POS_LENGTH];
1583         struct udf_vds_record *curr;
1584         struct generic_desc *gd;
1585         struct volDescPtr *vdp;
1586         int done = 0;
1587         uint32_t vdsn;
1588         uint16_t ident;
1589         long next_s = 0, next_e = 0;
1590
1591         memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1592
1593         /*
1594          * Read the main descriptor sequence and find which descriptors
1595          * are in it.
1596          */
1597         for (; (!done && block <= lastblock); block++) {
1598
1599                 bh = udf_read_tagged(sb, block, block, &ident);
1600                 if (!bh) {
1601                         printk(KERN_ERR "udf: Block %Lu of volume descriptor "
1602                                "sequence is corrupted or we could not read "
1603                                "it.\n", (unsigned long long)block);
1604                         return 1;
1605                 }
1606
1607                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1608                 gd = (struct generic_desc *)bh->b_data;
1609                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1610                 switch (ident) {
1611                 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1612                         curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1613                         if (vdsn >= curr->volDescSeqNum) {
1614                                 curr->volDescSeqNum = vdsn;
1615                                 curr->block = block;
1616                         }
1617                         break;
1618                 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1619                         curr = &vds[VDS_POS_VOL_DESC_PTR];
1620                         if (vdsn >= curr->volDescSeqNum) {
1621                                 curr->volDescSeqNum = vdsn;
1622                                 curr->block = block;
1623
1624                                 vdp = (struct volDescPtr *)bh->b_data;
1625                                 next_s = le32_to_cpu(
1626                                         vdp->nextVolDescSeqExt.extLocation);
1627                                 next_e = le32_to_cpu(
1628                                         vdp->nextVolDescSeqExt.extLength);
1629                                 next_e = next_e >> sb->s_blocksize_bits;
1630                                 next_e += next_s;
1631                         }
1632                         break;
1633                 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1634                         curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1635                         if (vdsn >= curr->volDescSeqNum) {
1636                                 curr->volDescSeqNum = vdsn;
1637                                 curr->block = block;
1638                         }
1639                         break;
1640                 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1641                         curr = &vds[VDS_POS_PARTITION_DESC];
1642                         if (!curr->block)
1643                                 curr->block = block;
1644                         break;
1645                 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1646                         curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1647                         if (vdsn >= curr->volDescSeqNum) {
1648                                 curr->volDescSeqNum = vdsn;
1649                                 curr->block = block;
1650                         }
1651                         break;
1652                 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1653                         curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1654                         if (vdsn >= curr->volDescSeqNum) {
1655                                 curr->volDescSeqNum = vdsn;
1656                                 curr->block = block;
1657                         }
1658                         break;
1659                 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1660                         vds[VDS_POS_TERMINATING_DESC].block = block;
1661                         if (next_e) {
1662                                 block = next_s;
1663                                 lastblock = next_e;
1664                                 next_s = next_e = 0;
1665                         } else
1666                                 done = 1;
1667                         break;
1668                 }
1669                 brelse(bh);
1670         }
1671         /*
1672          * Now read interesting descriptors again and process them
1673          * in a suitable order
1674          */
1675         if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1676                 printk(KERN_ERR "udf: Primary Volume Descriptor not found!\n");
1677                 return 1;
1678         }
1679         if (udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block))
1680                 return 1;
1681
1682         if (vds[VDS_POS_LOGICAL_VOL_DESC].block && udf_load_logicalvol(sb,
1683             vds[VDS_POS_LOGICAL_VOL_DESC].block, fileset))
1684                 return 1;
1685
1686         if (vds[VDS_POS_PARTITION_DESC].block) {
1687                 /*
1688                  * We rescan the whole descriptor sequence to find
1689                  * partition descriptor blocks and process them.
1690                  */
1691                 for (block = vds[VDS_POS_PARTITION_DESC].block;
1692                      block < vds[VDS_POS_TERMINATING_DESC].block;
1693                      block++)
1694                         if (udf_load_partdesc(sb, block))
1695                                 return 1;
1696         }
1697
1698         return 0;
1699 }
1700
1701 /*
1702  * udf_check_valid()
1703  */
1704 static int udf_check_valid(struct super_block *sb, int novrs, int silent)
1705 {
1706         long block;
1707         struct udf_sb_info *sbi = UDF_SB(sb);
1708
1709         if (novrs) {
1710                 udf_debug("Validity check skipped because of novrs option\n");
1711                 return 0;
1712         }
1713         /* Check that it is NSR02 compliant */
1714         /* Process any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
1715         block = udf_vrs(sb, silent);
1716         if (block == -1)
1717                 udf_debug("Failed to read byte 32768. Assuming open "
1718                           "disc. Skipping validity check\n");
1719         if (block && !sbi->s_last_block)
1720                 sbi->s_last_block = udf_get_last_block(sb);
1721         return !block;
1722 }
1723
1724 static int udf_load_sequence(struct super_block *sb, struct kernel_lb_addr *fileset)
1725 {
1726         struct anchorVolDescPtr *anchor;
1727         uint16_t ident;
1728         struct buffer_head *bh;
1729         long main_s, main_e, reserve_s, reserve_e;
1730         int i;
1731         struct udf_sb_info *sbi;
1732
1733         if (!sb)
1734                 return 1;
1735         sbi = UDF_SB(sb);
1736
1737         for (i = 0; i < ARRAY_SIZE(sbi->s_anchor); i++) {
1738                 if (!sbi->s_anchor[i])
1739                         continue;
1740
1741                 bh = udf_read_tagged(sb, sbi->s_anchor[i], sbi->s_anchor[i],
1742                                      &ident);
1743                 if (!bh)
1744                         continue;
1745
1746                 anchor = (struct anchorVolDescPtr *)bh->b_data;
1747
1748                 /* Locate the main sequence */
1749                 main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1750                 main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1751                 main_e = main_e >> sb->s_blocksize_bits;
1752                 main_e += main_s;
1753
1754                 /* Locate the reserve sequence */
1755                 reserve_s = le32_to_cpu(
1756                                 anchor->reserveVolDescSeqExt.extLocation);
1757                 reserve_e = le32_to_cpu(
1758                                 anchor->reserveVolDescSeqExt.extLength);
1759                 reserve_e = reserve_e >> sb->s_blocksize_bits;
1760                 reserve_e += reserve_s;
1761
1762                 brelse(bh);
1763
1764                 /* Process the main & reserve sequences */
1765                 /* responsible for finding the PartitionDesc(s) */
1766                 if (!(udf_process_sequence(sb, main_s, main_e,
1767                                            fileset) &&
1768                       udf_process_sequence(sb, reserve_s, reserve_e,
1769                                            fileset)))
1770                         break;
1771         }
1772
1773         if (i == ARRAY_SIZE(sbi->s_anchor)) {
1774                 udf_debug("No Anchor block found\n");
1775                 return 1;
1776         }
1777         udf_debug("Using anchor in block %d\n", sbi->s_anchor[i]);
1778
1779         return 0;
1780 }
1781
1782 static void udf_open_lvid(struct super_block *sb)
1783 {
1784         struct udf_sb_info *sbi = UDF_SB(sb);
1785         struct buffer_head *bh = sbi->s_lvid_bh;
1786         struct logicalVolIntegrityDesc *lvid;
1787         struct logicalVolIntegrityDescImpUse *lvidiu;
1788         if (!bh)
1789                 return;
1790
1791         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1792         lvidiu = udf_sb_lvidiu(sbi);
1793
1794         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1795         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1796         udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
1797                                 CURRENT_TIME);
1798         lvid->integrityType = LVID_INTEGRITY_TYPE_OPEN;
1799
1800         lvid->descTag.descCRC = cpu_to_le16(
1801                 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1802                         le16_to_cpu(lvid->descTag.descCRCLength)));
1803
1804         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1805         mark_buffer_dirty(bh);
1806 }
1807
1808 static void udf_close_lvid(struct super_block *sb)
1809 {
1810         struct udf_sb_info *sbi = UDF_SB(sb);
1811         struct buffer_head *bh = sbi->s_lvid_bh;
1812         struct logicalVolIntegrityDesc *lvid;
1813         struct logicalVolIntegrityDescImpUse *lvidiu;
1814
1815         if (!bh)
1816                 return;
1817
1818         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1819
1820         if (lvid->integrityType != LVID_INTEGRITY_TYPE_OPEN)
1821                 return;
1822
1823         lvidiu = udf_sb_lvidiu(sbi);
1824         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1825         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1826         udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
1827         if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1828                 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1829         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1830                 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1831         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
1832                 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
1833         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1834
1835         lvid->descTag.descCRC = cpu_to_le16(
1836                         crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1837                                 le16_to_cpu(lvid->descTag.descCRCLength)));
1838
1839         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1840         mark_buffer_dirty(bh);
1841 }
1842
1843 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
1844 {
1845         int i;
1846         int nr_groups = bitmap->s_nr_groups;
1847         int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
1848                                                 nr_groups);
1849
1850         for (i = 0; i < nr_groups; i++)
1851                 if (bitmap->s_block_bitmap[i])
1852                         brelse(bitmap->s_block_bitmap[i]);
1853
1854         if (size <= PAGE_SIZE)
1855                 kfree(bitmap);
1856         else
1857                 vfree(bitmap);
1858 }
1859
1860 static void udf_free_partition(struct udf_part_map *map)
1861 {
1862         int i;
1863         struct udf_meta_data *mdata;
1864
1865         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1866                 iput(map->s_uspace.s_table);
1867         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1868                 iput(map->s_fspace.s_table);
1869         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1870                 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
1871         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1872                 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
1873         if (map->s_partition_type == UDF_SPARABLE_MAP15)
1874                 for (i = 0; i < 4; i++)
1875                         brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
1876         else if (map->s_partition_type == UDF_METADATA_MAP25) {
1877                 mdata = &map->s_type_specific.s_metadata;
1878                 iput(mdata->s_metadata_fe);
1879                 mdata->s_metadata_fe = NULL;
1880
1881                 iput(mdata->s_mirror_fe);
1882                 mdata->s_mirror_fe = NULL;
1883
1884                 iput(mdata->s_bitmap_fe);
1885                 mdata->s_bitmap_fe = NULL;
1886         }
1887 }
1888
1889 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1890 {
1891         int i;
1892         struct inode *inode = NULL;
1893         struct udf_options uopt;
1894         struct kernel_lb_addr rootdir, fileset;
1895         struct udf_sb_info *sbi;
1896
1897         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1898         uopt.uid = -1;
1899         uopt.gid = -1;
1900         uopt.umask = 0;
1901         uopt.fmode = UDF_INVALID_MODE;
1902         uopt.dmode = UDF_INVALID_MODE;
1903
1904         sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1905         if (!sbi)
1906                 return -ENOMEM;
1907
1908         sb->s_fs_info = sbi;
1909
1910         mutex_init(&sbi->s_alloc_mutex);
1911
1912         if (!udf_parse_options((char *)options, &uopt, false))
1913                 goto error_out;
1914
1915         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1916             uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
1917                 udf_error(sb, "udf_read_super",
1918                           "utf8 cannot be combined with iocharset\n");
1919                 goto error_out;
1920         }
1921 #ifdef CONFIG_UDF_NLS
1922         if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1923                 uopt.nls_map = load_nls_default();
1924                 if (!uopt.nls_map)
1925                         uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1926                 else
1927                         udf_debug("Using default NLS map\n");
1928         }
1929 #endif
1930         if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1931                 uopt.flags |= (1 << UDF_FLAG_UTF8);
1932
1933         fileset.logicalBlockNum = 0xFFFFFFFF;
1934         fileset.partitionReferenceNum = 0xFFFF;
1935
1936         sbi->s_flags = uopt.flags;
1937         sbi->s_uid = uopt.uid;
1938         sbi->s_gid = uopt.gid;
1939         sbi->s_umask = uopt.umask;
1940         sbi->s_fmode = uopt.fmode;
1941         sbi->s_dmode = uopt.dmode;
1942         sbi->s_nls_map = uopt.nls_map;
1943
1944         /* Set the block size for all transfers */
1945         if (!sb_min_blocksize(sb, uopt.blocksize)) {
1946                 udf_debug("Bad block size (%d)\n", uopt.blocksize);
1947                 printk(KERN_ERR "udf: bad block size (%d)\n", uopt.blocksize);
1948                 goto error_out;
1949         }
1950
1951         if (uopt.session == 0xFFFFFFFF)
1952                 sbi->s_session = udf_get_last_session(sb);
1953         else
1954                 sbi->s_session = uopt.session;
1955
1956         udf_debug("Multi-session=%d\n", sbi->s_session);
1957
1958         sbi->s_last_block = uopt.lastblock;
1959         sbi->s_anchor[0] = sbi->s_anchor[1] = 0;
1960         sbi->s_anchor[2] = uopt.anchor;
1961
1962         if (udf_check_valid(sb, uopt.novrs, silent)) {
1963                 /* read volume recognition sequences */
1964                 printk(KERN_WARNING "UDF-fs: No VRS found\n");
1965                 goto error_out;
1966         }
1967
1968         udf_find_anchor(sb);
1969
1970         /* Fill in the rest of the superblock */
1971         sb->s_op = &udf_sb_ops;
1972         sb->s_export_op = &udf_export_ops;
1973         sb->dq_op = NULL;
1974         sb->s_dirt = 0;
1975         sb->s_magic = UDF_SUPER_MAGIC;
1976         sb->s_time_gran = 1000;
1977
1978         if (udf_load_sequence(sb, &fileset)) {
1979                 printk(KERN_WARNING "UDF-fs: No partition found (1)\n");
1980                 goto error_out;
1981         }
1982
1983         udf_debug("Lastblock=%d\n", sbi->s_last_block);
1984
1985         if (sbi->s_lvid_bh) {
1986                 struct logicalVolIntegrityDescImpUse *lvidiu =
1987                                                         udf_sb_lvidiu(sbi);
1988                 uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
1989                 uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
1990                 /* uint16_t maxUDFWriteRev =
1991                                 le16_to_cpu(lvidiu->maxUDFWriteRev); */
1992
1993                 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
1994                         printk(KERN_ERR "UDF-fs: minUDFReadRev=%x "
1995                                         "(max is %x)\n",
1996                                le16_to_cpu(lvidiu->minUDFReadRev),
1997                                UDF_MAX_READ_VERSION);
1998                         goto error_out;
1999                 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
2000                         sb->s_flags |= MS_RDONLY;
2001
2002                 sbi->s_udfrev = minUDFWriteRev;
2003
2004                 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
2005                         UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
2006                 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
2007                         UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
2008         }
2009
2010         if (!sbi->s_partitions) {
2011                 printk(KERN_WARNING "UDF-fs: No partition found (2)\n");
2012                 goto error_out;
2013         }
2014
2015         if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
2016                         UDF_PART_FLAG_READ_ONLY) {
2017                 printk(KERN_NOTICE "UDF-fs: Partition marked readonly; "
2018                                    "forcing readonly mount\n");
2019                 sb->s_flags |= MS_RDONLY;
2020         }
2021
2022         if (udf_find_fileset(sb, &fileset, &rootdir)) {
2023                 printk(KERN_WARNING "UDF-fs: No fileset found\n");
2024                 goto error_out;
2025         }
2026
2027         if (!silent) {
2028                 struct timestamp ts;
2029                 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
2030                 udf_info("UDF: Mounting volume '%s', "
2031                          "timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
2032                          sbi->s_volume_ident, le16_to_cpu(ts.year), ts.month, ts.day,
2033                          ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
2034         }
2035         if (!(sb->s_flags & MS_RDONLY))
2036                 udf_open_lvid(sb);
2037
2038         /* Assign the root inode */
2039         /* assign inodes by physical block number */
2040         /* perhaps it's not extensible enough, but for now ... */
2041         inode = udf_iget(sb, &rootdir);
2042         if (!inode) {
2043                 printk(KERN_ERR "UDF-fs: Error in udf_iget, block=%d, "
2044                                 "partition=%d\n",
2045                        rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
2046                 goto error_out;
2047         }
2048
2049         /* Allocate a dentry for the root inode */
2050         sb->s_root = d_alloc_root(inode);
2051         if (!sb->s_root) {
2052                 printk(KERN_ERR "UDF-fs: Couldn't allocate root dentry\n");
2053                 iput(inode);
2054                 goto error_out;
2055         }
2056         sb->s_maxbytes = MAX_LFS_FILESIZE;
2057         return 0;
2058
2059 error_out:
2060         if (sbi->s_vat_inode)
2061                 iput(sbi->s_vat_inode);
2062         if (sbi->s_partitions)
2063                 for (i = 0; i < sbi->s_partitions; i++)
2064                         udf_free_partition(&sbi->s_partmaps[i]);
2065 #ifdef CONFIG_UDF_NLS
2066         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2067                 unload_nls(sbi->s_nls_map);
2068 #endif
2069         if (!(sb->s_flags & MS_RDONLY))
2070                 udf_close_lvid(sb);
2071         brelse(sbi->s_lvid_bh);
2072
2073         kfree(sbi->s_partmaps);
2074         kfree(sbi);
2075         sb->s_fs_info = NULL;
2076
2077         return -EINVAL;
2078 }
2079
2080 static void udf_error(struct super_block *sb, const char *function,
2081                       const char *fmt, ...)
2082 {
2083         va_list args;
2084
2085         if (!(sb->s_flags & MS_RDONLY)) {
2086                 /* mark sb error */
2087                 sb->s_dirt = 1;
2088         }
2089         va_start(args, fmt);
2090         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2091         va_end(args);
2092         printk(KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
2093                 sb->s_id, function, error_buf);
2094 }
2095
2096 void udf_warning(struct super_block *sb, const char *function,
2097                  const char *fmt, ...)
2098 {
2099         va_list args;
2100
2101         va_start(args, fmt);
2102         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2103         va_end(args);
2104         printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
2105                sb->s_id, function, error_buf);
2106 }
2107
2108 static void udf_put_super(struct super_block *sb)
2109 {
2110         int i;
2111         struct udf_sb_info *sbi;
2112
2113         sbi = UDF_SB(sb);
2114         if (sbi->s_vat_inode)
2115                 iput(sbi->s_vat_inode);
2116         if (sbi->s_partitions)
2117                 for (i = 0; i < sbi->s_partitions; i++)
2118                         udf_free_partition(&sbi->s_partmaps[i]);
2119 #ifdef CONFIG_UDF_NLS
2120         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2121                 unload_nls(sbi->s_nls_map);
2122 #endif
2123         if (!(sb->s_flags & MS_RDONLY))
2124                 udf_close_lvid(sb);
2125         brelse(sbi->s_lvid_bh);
2126         kfree(sbi->s_partmaps);
2127         kfree(sb->s_fs_info);
2128         sb->s_fs_info = NULL;
2129 }
2130
2131 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
2132 {
2133         struct super_block *sb = dentry->d_sb;
2134         struct udf_sb_info *sbi = UDF_SB(sb);
2135         struct logicalVolIntegrityDescImpUse *lvidiu;
2136         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
2137
2138         if (sbi->s_lvid_bh != NULL)
2139                 lvidiu = udf_sb_lvidiu(sbi);
2140         else
2141                 lvidiu = NULL;
2142
2143         buf->f_type = UDF_SUPER_MAGIC;
2144         buf->f_bsize = sb->s_blocksize;
2145         buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
2146         buf->f_bfree = udf_count_free(sb);
2147         buf->f_bavail = buf->f_bfree;
2148         buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2149                                           le32_to_cpu(lvidiu->numDirs)) : 0)
2150                         + buf->f_bfree;
2151         buf->f_ffree = buf->f_bfree;
2152         buf->f_namelen = UDF_NAME_LEN - 2;
2153         buf->f_fsid.val[0] = (u32)id;
2154         buf->f_fsid.val[1] = (u32)(id >> 32);
2155
2156         return 0;
2157 }
2158
2159 static unsigned int udf_count_free_bitmap(struct super_block *sb,
2160                                           struct udf_bitmap *bitmap)
2161 {
2162         struct buffer_head *bh = NULL;
2163         unsigned int accum = 0;
2164         int index;
2165         int block = 0, newblock;
2166         struct kernel_lb_addr loc;
2167         uint32_t bytes;
2168         uint8_t *ptr;
2169         uint16_t ident;
2170         struct spaceBitmapDesc *bm;
2171
2172         lock_kernel();
2173
2174         loc.logicalBlockNum = bitmap->s_extPosition;
2175         loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
2176         bh = udf_read_ptagged(sb, &loc, 0, &ident);
2177
2178         if (!bh) {
2179                 printk(KERN_ERR "udf: udf_count_free failed\n");
2180                 goto out;
2181         } else if (ident != TAG_IDENT_SBD) {
2182                 brelse(bh);
2183                 printk(KERN_ERR "udf: udf_count_free failed\n");
2184                 goto out;
2185         }
2186
2187         bm = (struct spaceBitmapDesc *)bh->b_data;
2188         bytes = le32_to_cpu(bm->numOfBytes);
2189         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2190         ptr = (uint8_t *)bh->b_data;
2191
2192         while (bytes > 0) {
2193                 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2194                 accum += bitmap_weight((const unsigned long *)(ptr + index),
2195                                         cur_bytes * 8);
2196                 bytes -= cur_bytes;
2197                 if (bytes) {
2198                         brelse(bh);
2199                         newblock = udf_get_lb_pblock(sb, &loc, ++block);
2200                         bh = udf_tread(sb, newblock);
2201                         if (!bh) {
2202                                 udf_debug("read failed\n");
2203                                 goto out;
2204                         }
2205                         index = 0;
2206                         ptr = (uint8_t *)bh->b_data;
2207                 }
2208         }
2209         brelse(bh);
2210
2211 out:
2212         unlock_kernel();
2213
2214         return accum;
2215 }
2216
2217 static unsigned int udf_count_free_table(struct super_block *sb,
2218                                          struct inode *table)
2219 {
2220         unsigned int accum = 0;
2221         uint32_t elen;
2222         struct kernel_lb_addr eloc;
2223         int8_t etype;
2224         struct extent_position epos;
2225
2226         lock_kernel();
2227
2228         epos.block = UDF_I(table)->i_location;
2229         epos.offset = sizeof(struct unallocSpaceEntry);
2230         epos.bh = NULL;
2231
2232         while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2233                 accum += (elen >> table->i_sb->s_blocksize_bits);
2234
2235         brelse(epos.bh);
2236
2237         unlock_kernel();
2238
2239         return accum;
2240 }
2241
2242 static unsigned int udf_count_free(struct super_block *sb)
2243 {
2244         unsigned int accum = 0;
2245         struct udf_sb_info *sbi;
2246         struct udf_part_map *map;
2247
2248         sbi = UDF_SB(sb);
2249         if (sbi->s_lvid_bh) {
2250                 struct logicalVolIntegrityDesc *lvid =
2251                         (struct logicalVolIntegrityDesc *)
2252                         sbi->s_lvid_bh->b_data;
2253                 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
2254                         accum = le32_to_cpu(
2255                                         lvid->freeSpaceTable[sbi->s_partition]);
2256                         if (accum == 0xFFFFFFFF)
2257                                 accum = 0;
2258                 }
2259         }
2260
2261         if (accum)
2262                 return accum;
2263
2264         map = &sbi->s_partmaps[sbi->s_partition];
2265         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2266                 accum += udf_count_free_bitmap(sb,
2267                                                map->s_uspace.s_bitmap);
2268         }
2269         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
2270                 accum += udf_count_free_bitmap(sb,
2271                                                map->s_fspace.s_bitmap);
2272         }
2273         if (accum)
2274                 return accum;
2275
2276         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2277                 accum += udf_count_free_table(sb,
2278                                               map->s_uspace.s_table);
2279         }
2280         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
2281                 accum += udf_count_free_table(sb,
2282                                               map->s_fspace.s_table);
2283         }
2284
2285         return accum;
2286 }