fs/udf/super.c

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