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