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 int udf_sync_fs(struct super_block *, int);
  85 static int udf_remount_fs(struct super_block *, int *, char *);
  86 static void udf_load_logicalvolint(struct super_block *, struct kernel_extent_ad);
  87 static int udf_find_fileset(struct super_block *, struct kernel_lb_addr *,
  88                             struct kernel_lb_addr *);
  89 static void udf_load_fileset(struct super_block *, struct buffer_head *,
  90                              struct kernel_lb_addr *);
  91 static void udf_open_lvid(struct super_block *);
  92 static void udf_close_lvid(struct super_block *);
  93 static unsigned int udf_count_free(struct super_block *);
  94 static int udf_statfs(struct dentry *, struct kstatfs *);
  95 static int udf_show_options(struct seq_file *, struct vfsmount *);
  96 static void udf_error(struct super_block *sb, const char *function,
  97                       const char *fmt, ...);
  98
  99 struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct udf_sb_info *sbi)
 100 {
 101         struct logicalVolIntegrityDesc *lvid =
 102                 (struct logicalVolIntegrityDesc *)sbi->s_lvid_bh->b_data;
 103         __u32 number_of_partitions = le32_to_cpu(lvid->numOfPartitions);
 104         __u32 offset = number_of_partitions * 2 *
 105                                 sizeof(uint32_t)/sizeof(uint8_t);
 106         return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
 107 }
 108
 109 /* UDF filesystem type */
 110 static int udf_get_sb(struct file_system_type *fs_type,
 111                       int flags, const char *dev_name, void *data,
 112                       struct vfsmount *mnt)
 113 {
 114         return get_sb_bdev(fs_type, flags, dev_name, data, udf_fill_super, mnt);
 115 }
 116
 117 static struct file_system_type udf_fstype = {
 118         .owner          = THIS_MODULE,
 119         .name           = "udf",
 120         .get_sb         = udf_get_sb,
 121         .kill_sb        = kill_block_super,
 122         .fs_flags       = FS_REQUIRES_DEV,
 123 };
 124
 125 static struct kmem_cache *udf_inode_cachep;
 126
 127 static struct inode *udf_alloc_inode(struct super_block *sb)
 128 {
 129         struct udf_inode_info *ei;
 130         ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
 131         if (!ei)
 132                 return NULL;
 133
 134         ei->i_unique = 0;
 135         ei->i_lenExtents = 0;
 136         ei->i_next_alloc_block = 0;
 137         ei->i_next_alloc_goal = 0;
 138         ei->i_strat4096 = 0;
 139
 140         return &ei->vfs_inode;
 141 }
 142
 143 static void udf_destroy_inode(struct inode *inode)
 144 {
 145         kmem_cache_free(udf_inode_cachep, UDF_I(inode));
 146 }
 147
 148 static void init_once(void *foo)
 149 {
 150         struct udf_inode_info *ei = (struct udf_inode_info *)foo;
 151
 152         ei->i_ext.i_data = NULL;
 153         inode_init_once(&ei->vfs_inode);
 154 }
 155
 156 static int init_inodecache(void)
 157 {
 158         udf_inode_cachep = kmem_cache_create("udf_inode_cache",
 159                                              sizeof(struct udf_inode_info),
 160                                              0, (SLAB_RECLAIM_ACCOUNT |
 161                                                  SLAB_MEM_SPREAD),
 162                                              init_once);
 163         if (!udf_inode_cachep)
 164                 return -ENOMEM;
 165         return 0;
 166 }
 167
 168 static void destroy_inodecache(void)
 169 {
 170         kmem_cache_destroy(udf_inode_cachep);
 171 }
 172
 173 /* Superblock operations */
 174 static const struct super_operations udf_sb_ops = {
 175         .alloc_inode    = udf_alloc_inode,
 176         .destroy_inode  = udf_destroy_inode,
 177         .write_inode    = udf_write_inode,
 178         .delete_inode   = udf_delete_inode,
 179         .clear_inode    = udf_clear_inode,
 180         .put_super      = udf_put_super,
 181         .sync_fs        = udf_sync_fs,
 182         .statfs         = udf_statfs,
 183         .remount_fs     = udf_remount_fs,
 184         .show_options   = udf_show_options,
 185 };
 186
 187 struct udf_options {
 188         unsigned char novrs;
 189         unsigned int blocksize;
 190         unsigned int session;
 191         unsigned int lastblock;
 192         unsigned int anchor;
 193         unsigned int volume;
 194         unsigned short partition;
 195         unsigned int fileset;
 196         unsigned int rootdir;
 197         unsigned int flags;
 198         mode_t umask;
 199         gid_t gid;
 200         uid_t uid;
 201         mode_t fmode;
 202         mode_t dmode;
 203         struct nls_table *nls_map;
 204 };
 205
 206 static int __init init_udf_fs(void)
 207 {
 208         int err;
 209
 210         err = init_inodecache();
 211         if (err)
 212                 goto out1;
 213         err = register_filesystem(&udf_fstype);
 214         if (err)
 215                 goto out;
 216
 217         return 0;
 218
 219 out:
 220         destroy_inodecache();
 221
 222 out1:
 223         return err;
 224 }
 225
 226 static void __exit exit_udf_fs(void)
 227 {
 228         unregister_filesystem(&udf_fstype);
 229         destroy_inodecache();
 230 }
 231
 232 module_init(init_udf_fs)
 233 module_exit(exit_udf_fs)
 234
 235 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
 236 {
 237         struct udf_sb_info *sbi = UDF_SB(sb);
 238
 239         sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map),
 240                                   GFP_KERNEL);
 241         if (!sbi->s_partmaps) {
 242                 udf_error(sb, __func__,
 243                           "Unable to allocate space for %d partition maps",
 244                           count);
 245                 sbi->s_partitions = 0;
 246                 return -ENOMEM;
 247         }
 248
 249         sbi->s_partitions = count;
 250         return 0;
 251 }
 252
 253 static int udf_show_options(struct seq_file *seq, struct vfsmount *mnt)
 254 {
 255         struct super_block *sb = mnt->mnt_sb;
 256         struct udf_sb_info *sbi = UDF_SB(sb);
 257
 258         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
 259                 seq_puts(seq, ",nostrict");
 260         if (UDF_QUERY_FLAG(sb, UDF_FLAG_BLOCKSIZE_SET))
 261                 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
 262         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
 263                 seq_puts(seq, ",unhide");
 264         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
 265                 seq_puts(seq, ",undelete");
 266         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
 267                 seq_puts(seq, ",noadinicb");
 268         if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
 269                 seq_puts(seq, ",shortad");
 270         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
 271                 seq_puts(seq, ",uid=forget");
 272         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_IGNORE))
 273                 seq_puts(seq, ",uid=ignore");
 274         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
 275                 seq_puts(seq, ",gid=forget");
 276         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE))
 277                 seq_puts(seq, ",gid=ignore");
 278         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
 279                 seq_printf(seq, ",uid=%u", sbi->s_uid);
 280         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
 281                 seq_printf(seq, ",gid=%u", sbi->s_gid);
 282         if (sbi->s_umask != 0)
 283                 seq_printf(seq, ",umask=%o", sbi->s_umask);
 284         if (sbi->s_fmode != UDF_INVALID_MODE)
 285                 seq_printf(seq, ",mode=%o", sbi->s_fmode);
 286         if (sbi->s_dmode != UDF_INVALID_MODE)
 287                 seq_printf(seq, ",dmode=%o", sbi->s_dmode);
 288         if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
 289                 seq_printf(seq, ",session=%u", sbi->s_session);
 290         if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
 291                 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
 292         if (sbi->s_anchor != 0)
 293                 seq_printf(seq, ",anchor=%u", sbi->s_anchor);
 294         /*
 295          * volume, partition, fileset and rootdir seem to be ignored
 296          * currently
 297          */
 298         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
 299                 seq_puts(seq, ",utf8");
 300         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
 301                 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
 302
 303         return 0;
 304 }
 305
 306 /*
 307  * udf_parse_options
 308  *
 309  * PURPOSE
 310  *      Parse mount options.
 311  *
 312  * DESCRIPTION
 313  *      The following mount options are supported:
 314  *
 315  *      gid=            Set the default group.
 316  *      umask=          Set the default umask.
 317  *      mode=           Set the default file permissions.
 318  *      dmode=          Set the default directory permissions.
 319  *      uid=            Set the default user.
 320  *      bs=             Set the block size.
 321  *      unhide          Show otherwise hidden files.
 322  *      undelete        Show deleted files in lists.
 323  *      adinicb         Embed data in the inode (default)
 324  *      noadinicb       Don't embed data in the inode
 325  *      shortad         Use short ad's
 326  *      longad          Use long ad's (default)
 327  *      nostrict        Unset strict conformance
 328  *      iocharset=      Set the NLS character set
 329  *
 330  *      The remaining are for debugging and disaster recovery:
 331  *
 332  *      novrs           Skip volume sequence recognition
 333  *
 334  *      The following expect a offset from 0.
 335  *
 336  *      session=        Set the CDROM session (default= last session)
 337  *      anchor=         Override standard anchor location. (default= 256)
 338  *      volume=         Override the VolumeDesc location. (unused)
 339  *      partition=      Override the PartitionDesc location. (unused)
 340  *      lastblock=      Set the last block of the filesystem/
 341  *
 342  *      The following expect a offset from the partition root.
 343  *
 344  *      fileset=        Override the fileset block location. (unused)
 345  *      rootdir=        Override the root directory location. (unused)
 346  *              WARNING: overriding the rootdir to a non-directory may
 347  *              yield highly unpredictable results.
 348  *
 349  * PRE-CONDITIONS
 350  *      options         Pointer to mount options string.
 351  *      uopts           Pointer to mount options variable.
 352  *
 353  * POST-CONDITIONS
 354  *      <return>        1       Mount options parsed okay.
 355  *      <return>        0       Error parsing mount options.
 356  *
 357  * HISTORY
 358  *      July 1, 1997 - Andrew E. Mileski
 359  *      Written, tested, and released.
 360  */
 361
 362 enum {
 363         Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
 364         Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
 365         Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
 366         Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
 367         Opt_rootdir, Opt_utf8, Opt_iocharset,
 368         Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore,
 369         Opt_fmode, Opt_dmode
 370 };
 371
 372 static const match_table_t tokens = {
 373         {Opt_novrs,     "novrs"},
 374         {Opt_nostrict,  "nostrict"},
 375         {Opt_bs,        "bs=%u"},
 376         {Opt_unhide,    "unhide"},
 377         {Opt_undelete,  "undelete"},
 378         {Opt_noadinicb, "noadinicb"},
 379         {Opt_adinicb,   "adinicb"},
 380         {Opt_shortad,   "shortad"},
 381         {Opt_longad,    "longad"},
 382         {Opt_uforget,   "uid=forget"},
 383         {Opt_uignore,   "uid=ignore"},
 384         {Opt_gforget,   "gid=forget"},
 385         {Opt_gignore,   "gid=ignore"},
 386         {Opt_gid,       "gid=%u"},
 387         {Opt_uid,       "uid=%u"},
 388         {Opt_umask,     "umask=%o"},
 389         {Opt_session,   "session=%u"},
 390         {Opt_lastblock, "lastblock=%u"},
 391         {Opt_anchor,    "anchor=%u"},
 392         {Opt_volume,    "volume=%u"},
 393         {Opt_partition, "partition=%u"},
 394         {Opt_fileset,   "fileset=%u"},
 395         {Opt_rootdir,   "rootdir=%u"},
 396         {Opt_utf8,      "utf8"},
 397         {Opt_iocharset, "iocharset=%s"},
 398         {Opt_fmode,     "mode=%o"},
 399         {Opt_dmode,     "dmode=%o"},
 400         {Opt_err,       NULL}
 401 };
 402
 403 static int udf_parse_options(char *options, struct udf_options *uopt,
 404                              bool remount)
 405 {
 406         char *p;
 407         int option;
 408
 409         uopt->novrs = 0;
 410         uopt->partition = 0xFFFF;
 411         uopt->session = 0xFFFFFFFF;
 412         uopt->lastblock = 0;
 413         uopt->anchor = 0;
 414         uopt->volume = 0xFFFFFFFF;
 415         uopt->rootdir = 0xFFFFFFFF;
 416         uopt->fileset = 0xFFFFFFFF;
 417         uopt->nls_map = NULL;
 418
 419         if (!options)
 420                 return 1;
 421
 422         while ((p = strsep(&options, ",")) != NULL) {
 423                 substring_t args[MAX_OPT_ARGS];
 424                 int token;
 425                 if (!*p)
 426                         continue;
 427
 428                 token = match_token(p, tokens, args);
 429                 switch (token) {
 430                 case Opt_novrs:
 431                         uopt->novrs = 1;
 432                         break;
 433                 case Opt_bs:
 434                         if (match_int(&args[0], &option))
 435                                 return 0;
 436                         uopt->blocksize = option;
 437                         uopt->flags |= (1 << UDF_FLAG_BLOCKSIZE_SET);
 438                         break;
 439                 case Opt_unhide:
 440                         uopt->flags |= (1 << UDF_FLAG_UNHIDE);
 441                         break;
 442                 case Opt_undelete:
 443                         uopt->flags |= (1 << UDF_FLAG_UNDELETE);
 444                         break;
 445                 case Opt_noadinicb:
 446                         uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
 447                         break;
 448                 case Opt_adinicb:
 449                         uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
 450                         break;
 451                 case Opt_shortad:
 452                         uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
 453                         break;
 454                 case Opt_longad:
 455                         uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
 456                         break;
 457                 case Opt_gid:
 458                         if (match_int(args, &option))
 459                                 return 0;
 460                         uopt->gid = option;
 461                         uopt->flags |= (1 << UDF_FLAG_GID_SET);
 462                         break;
 463                 case Opt_uid:
 464                         if (match_int(args, &option))
 465                                 return 0;
 466                         uopt->uid = option;
 467                         uopt->flags |= (1 << UDF_FLAG_UID_SET);
 468                         break;
 469                 case Opt_umask:
 470                         if (match_octal(args, &option))
 471                                 return 0;
 472                         uopt->umask = option;
 473                         break;
 474                 case Opt_nostrict:
 475                         uopt->flags &= ~(1 << UDF_FLAG_STRICT);
 476                         break;
 477                 case Opt_session:
 478                         if (match_int(args, &option))
 479                                 return 0;
 480                         uopt->session = option;
 481                         if (!remount)
 482                                 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
 483                         break;
 484                 case Opt_lastblock:
 485                         if (match_int(args, &option))
 486                                 return 0;
 487                         uopt->lastblock = option;
 488                         if (!remount)
 489                                 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
 490                         break;
 491                 case Opt_anchor:
 492                         if (match_int(args, &option))
 493                                 return 0;
 494                         uopt->anchor = option;
 495                         break;
 496                 case Opt_volume:
 497                         if (match_int(args, &option))
 498                                 return 0;
 499                         uopt->volume = option;
 500                         break;
 501                 case Opt_partition:
 502                         if (match_int(args, &option))
 503                                 return 0;
 504                         uopt->partition = option;
 505                         break;
 506                 case Opt_fileset:
 507                         if (match_int(args, &option))
 508                                 return 0;
 509                         uopt->fileset = option;
 510                         break;
 511                 case Opt_rootdir:
 512                         if (match_int(args, &option))
 513                                 return 0;
 514                         uopt->rootdir = option;
 515                         break;
 516                 case Opt_utf8:
 517                         uopt->flags |= (1 << UDF_FLAG_UTF8);
 518                         break;
 519 #ifdef CONFIG_UDF_NLS
 520                 case Opt_iocharset:
 521                         uopt->nls_map = load_nls(args[0].from);
 522                         uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
 523                         break;
 524 #endif
 525                 case Opt_uignore:
 526                         uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
 527                         break;
 528                 case Opt_uforget:
 529                         uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
 530                         break;
 531                 case Opt_gignore:
 532                         uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
 533                         break;
 534                 case Opt_gforget:
 535                         uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
 536                         break;
 537                 case Opt_fmode:
 538                         if (match_octal(args, &option))
 539                                 return 0;
 540                         uopt->fmode = option & 0777;
 541                         break;
 542                 case Opt_dmode:
 543                         if (match_octal(args, &option))
 544                                 return 0;
 545                         uopt->dmode = option & 0777;
 546                         break;
 547                 default:
 548                         printk(KERN_ERR "udf: bad mount option \"%s\" "
 549                                "or missing value\n", p);
 550                         return 0;
 551                 }
 552         }
 553         return 1;
 554 }
 555
 556 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
 557 {
 558         struct udf_options uopt;
 559         struct udf_sb_info *sbi = UDF_SB(sb);
 560         int error = 0;
 561
 562         uopt.flags = sbi->s_flags;
 563         uopt.uid   = sbi->s_uid;
 564         uopt.gid   = sbi->s_gid;
 565         uopt.umask = sbi->s_umask;
 566         uopt.fmode = sbi->s_fmode;
 567         uopt.dmode = sbi->s_dmode;
 568
 569         if (!udf_parse_options(options, &uopt, true))
 570                 return -EINVAL;
 571
 572         lock_kernel();
 573         sbi->s_flags = uopt.flags;
 574         sbi->s_uid   = uopt.uid;
 575         sbi->s_gid   = uopt.gid;
 576         sbi->s_umask = uopt.umask;
 577         sbi->s_fmode = uopt.fmode;
 578         sbi->s_dmode = uopt.dmode;
 579
 580         if (sbi->s_lvid_bh) {
 581                 int write_rev = le16_to_cpu(udf_sb_lvidiu(sbi)->minUDFWriteRev);
 582                 if (write_rev > UDF_MAX_WRITE_VERSION)
 583                         *flags |= MS_RDONLY;
 584         }
 585
 586         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 587                 goto out_unlock;
 588
 589         if (*flags & MS_RDONLY)
 590                 udf_close_lvid(sb);
 591         else
 592                 udf_open_lvid(sb);
 593
 594 out_unlock:
 595         unlock_kernel();
 596         return error;
 597 }
 598
 599 /* Check Volume Structure Descriptors (ECMA 167 2/9.1) */
 600 /* We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
 601 static loff_t udf_check_vsd(struct super_block *sb)
 602 {
 603         struct volStructDesc *vsd = NULL;
 604         loff_t sector = 32768;
 605         int sectorsize;
 606         struct buffer_head *bh = NULL;
 607         int nsr02 = 0;
 608         int nsr03 = 0;
 609         struct udf_sb_info *sbi;
 610
 611         sbi = UDF_SB(sb);
 612         if (sb->s_blocksize < sizeof(struct volStructDesc))
 613                 sectorsize = sizeof(struct volStructDesc);
 614         else
 615                 sectorsize = sb->s_blocksize;
 616
 617         sector += (sbi->s_session << sb->s_blocksize_bits);
 618
 619         udf_debug("Starting at sector %u (%ld byte sectors)\n",
 620                   (unsigned int)(sector >> sb->s_blocksize_bits),
 621                   sb->s_blocksize);
 622         /* Process the sequence (if applicable) */
 623         for (; !nsr02 && !nsr03; sector += sectorsize) {
 624                 /* Read a block */
 625                 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
 626                 if (!bh)
 627                         break;
 628
 629                 /* Look for ISO  descriptors */
 630                 vsd = (struct volStructDesc *)(bh->b_data +
 631                                               (sector & (sb->s_blocksize - 1)));
 632
 633                 if (vsd->stdIdent[0] == 0) {
 634                         brelse(bh);
 635                         break;
 636                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
 637                                     VSD_STD_ID_LEN)) {
 638                         switch (vsd->structType) {
 639                         case 0:
 640                                 udf_debug("ISO9660 Boot Record found\n");
 641                                 break;
 642                         case 1:
 643                                 udf_debug("ISO9660 Primary Volume Descriptor "
 644                                           "found\n");
 645                                 break;
 646                         case 2:
 647                                 udf_debug("ISO9660 Supplementary Volume "
 648                                           "Descriptor found\n");
 649                                 break;
 650                         case 3:
 651                                 udf_debug("ISO9660 Volume Partition Descriptor "
 652                                           "found\n");
 653                                 break;
 654                         case 255:
 655                                 udf_debug("ISO9660 Volume Descriptor Set "
 656                                           "Terminator found\n");
 657                                 break;
 658                         default:
 659                                 udf_debug("ISO9660 VRS (%u) found\n",
 660                                           vsd->structType);
 661                                 break;
 662                         }
 663                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
 664                                     VSD_STD_ID_LEN))
 665                         ; /* nothing */
 666                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
 667                                     VSD_STD_ID_LEN)) {
 668                         brelse(bh);
 669                         break;
 670                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
 671                                     VSD_STD_ID_LEN))
 672                         nsr02 = sector;
 673                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
 674                                     VSD_STD_ID_LEN))
 675                         nsr03 = sector;
 676                 brelse(bh);
 677         }
 678
 679         if (nsr03)
 680                 return nsr03;
 681         else if (nsr02)
 682                 return nsr02;
 683         else if (sector - (sbi->s_session << sb->s_blocksize_bits) == 32768)
 684                 return -1;
 685         else
 686                 return 0;
 687 }
 688
 689 static int udf_find_fileset(struct super_block *sb,
 690                             struct kernel_lb_addr *fileset,
 691                             struct kernel_lb_addr *root)
 692 {
 693         struct buffer_head *bh = NULL;
 694         long lastblock;
 695         uint16_t ident;
 696         struct udf_sb_info *sbi;
 697
 698         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
 699             fileset->partitionReferenceNum != 0xFFFF) {
 700                 bh = udf_read_ptagged(sb, fileset, 0, &ident);
 701
 702                 if (!bh) {
 703                         return 1;
 704                 } else if (ident != TAG_IDENT_FSD) {
 705                         brelse(bh);
 706                         return 1;
 707                 }
 708
 709         }
 710
 711         sbi = UDF_SB(sb);
 712         if (!bh) {
 713                 /* Search backwards through the partitions */
 714                 struct kernel_lb_addr newfileset;
 715
 716 /* --> cvg: FIXME - is it reasonable? */
 717                 return 1;
 718
 719                 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
 720                      (newfileset.partitionReferenceNum != 0xFFFF &&
 721                       fileset->logicalBlockNum == 0xFFFFFFFF &&
 722                       fileset->partitionReferenceNum == 0xFFFF);
 723                      newfileset.partitionReferenceNum--) {
 724                         lastblock = sbi->s_partmaps
 725                                         [newfileset.partitionReferenceNum]
 726                                                 .s_partition_len;
 727                         newfileset.logicalBlockNum = 0;
 728
 729                         do {
 730                                 bh = udf_read_ptagged(sb, &newfileset, 0,
 731                                                       &ident);
 732                                 if (!bh) {
 733                                         newfileset.logicalBlockNum++;
 734                                         continue;
 735                                 }
 736
 737                                 switch (ident) {
 738                                 case TAG_IDENT_SBD:
 739                                 {
 740                                         struct spaceBitmapDesc *sp;
 741                                         sp = (struct spaceBitmapDesc *)
 742                                                                 bh->b_data;
 743                                         newfileset.logicalBlockNum += 1 +
 744                                                 ((le32_to_cpu(sp->numOfBytes) +
 745                                                   sizeof(struct spaceBitmapDesc)
 746                                                   - 1) >> sb->s_blocksize_bits);
 747                                         brelse(bh);
 748                                         break;
 749                                 }
 750                                 case TAG_IDENT_FSD:
 751                                         *fileset = newfileset;
 752                                         break;
 753                                 default:
 754                                         newfileset.logicalBlockNum++;
 755                                         brelse(bh);
 756                                         bh = NULL;
 757                                         break;
 758                                 }
 759                         } while (newfileset.logicalBlockNum < lastblock &&
 760                                  fileset->logicalBlockNum == 0xFFFFFFFF &&
 761                                  fileset->partitionReferenceNum == 0xFFFF);
 762                 }
 763         }
 764
 765         if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
 766              fileset->partitionReferenceNum != 0xFFFF) && bh) {
 767                 udf_debug("Fileset at block=%d, partition=%d\n",
 768                           fileset->logicalBlockNum,
 769                           fileset->partitionReferenceNum);
 770
 771                 sbi->s_partition = fileset->partitionReferenceNum;
 772                 udf_load_fileset(sb, bh, root);
 773                 brelse(bh);
 774                 return 0;
 775         }
 776         return 1;
 777 }
 778
 779 static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
 780 {
 781         struct primaryVolDesc *pvoldesc;
 782         struct ustr *instr, *outstr;
 783         struct buffer_head *bh;
 784         uint16_t ident;
 785         int ret = 1;
 786
 787         instr = kmalloc(sizeof(struct ustr), GFP_NOFS);
 788         if (!instr)
 789                 return 1;
 790
 791         outstr = kmalloc(sizeof(struct ustr), GFP_NOFS);
 792         if (!outstr)
 793                 goto out1;
 794
 795         bh = udf_read_tagged(sb, block, block, &ident);
 796         if (!bh)
 797                 goto out2;
 798
 799         BUG_ON(ident != TAG_IDENT_PVD);
 800
 801         pvoldesc = (struct primaryVolDesc *)bh->b_data;
 802
 803         if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
 804                               pvoldesc->recordingDateAndTime)) {
 805 #ifdef UDFFS_DEBUG
 806                 struct timestamp *ts = &pvoldesc->recordingDateAndTime;
 807                 udf_debug("recording time %04u/%02u/%02u"
 808                           " %02u:%02u (%x)\n",
 809                           le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
 810                           ts->minute, le16_to_cpu(ts->typeAndTimezone));
 811 #endif
 812         }
 813
 814         if (!udf_build_ustr(instr, pvoldesc->volIdent, 32))
 815                 if (udf_CS0toUTF8(outstr, instr)) {
 816                         strncpy(UDF_SB(sb)->s_volume_ident, outstr->u_name,
 817                                 outstr->u_len > 31 ? 31 : outstr->u_len);
 818                         udf_debug("volIdent[] = '%s'\n",
 819                                         UDF_SB(sb)->s_volume_ident);
 820                 }
 821
 822         if (!udf_build_ustr(instr, pvoldesc->volSetIdent, 128))
 823                 if (udf_CS0toUTF8(outstr, instr))
 824                         udf_debug("volSetIdent[] = '%s'\n", outstr->u_name);
 825
 826         brelse(bh);
 827         ret = 0;
 828 out2:
 829         kfree(outstr);
 830 out1:
 831         kfree(instr);
 832         return ret;
 833 }
 834
 835 static int udf_load_metadata_files(struct super_block *sb, int partition)
 836 {
 837         struct udf_sb_info *sbi = UDF_SB(sb);
 838         struct udf_part_map *map;
 839         struct udf_meta_data *mdata;
 840         struct kernel_lb_addr addr;
 841         int fe_error = 0;
 842
 843         map = &sbi->s_partmaps[partition];
 844         mdata = &map->s_type_specific.s_metadata;
 845
 846         /* metadata address */
 847         addr.logicalBlockNum =  mdata->s_meta_file_loc;
 848         addr.partitionReferenceNum = map->s_partition_num;
 849
 850         udf_debug("Metadata file location: block = %d part = %d\n",
 851                           addr.logicalBlockNum, addr.partitionReferenceNum);
 852
 853         mdata->s_metadata_fe = udf_iget(sb, &addr);
 854
 855         if (mdata->s_metadata_fe == NULL) {
 856                 udf_warning(sb, __func__, "metadata inode efe not found, "
 857                                 "will try mirror inode.");
 858                 fe_error = 1;
 859         } else if (UDF_I(mdata->s_metadata_fe)->i_alloc_type !=
 860                  ICBTAG_FLAG_AD_SHORT) {
 861                 udf_warning(sb, __func__, "metadata inode efe does not have "
 862                         "short allocation descriptors!");
 863                 fe_error = 1;
 864                 iput(mdata->s_metadata_fe);
 865                 mdata->s_metadata_fe = NULL;
 866         }
 867
 868         /* mirror file entry */
 869         addr.logicalBlockNum = mdata->s_mirror_file_loc;
 870         addr.partitionReferenceNum = map->s_partition_num;
 871
 872         udf_debug("Mirror metadata file location: block = %d part = %d\n",
 873                           addr.logicalBlockNum, addr.partitionReferenceNum);
 874
 875         mdata->s_mirror_fe = udf_iget(sb, &addr);
 876
 877         if (mdata->s_mirror_fe == NULL) {
 878                 if (fe_error) {
 879                         udf_error(sb, __func__, "mirror inode efe not found "
 880                         "and metadata inode is missing too, exiting...");
 881                         goto error_exit;
 882                 } else
 883                         udf_warning(sb, __func__, "mirror inode efe not found,"
 884                                         " but metadata inode is OK");
 885         } else if (UDF_I(mdata->s_mirror_fe)->i_alloc_type !=
 886                  ICBTAG_FLAG_AD_SHORT) {
 887                 udf_warning(sb, __func__, "mirror inode efe does not have "
 888                         "short allocation descriptors!");
 889                 iput(mdata->s_mirror_fe);
 890                 mdata->s_mirror_fe = NULL;
 891                 if (fe_error)
 892                         goto error_exit;
 893         }
 894
 895         /*
 896          * bitmap file entry
 897          * Note:
 898          * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
 899         */
 900         if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
 901                 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
 902                 addr.partitionReferenceNum = map->s_partition_num;
 903
 904                 udf_debug("Bitmap file location: block = %d part = %d\n",
 905                         addr.logicalBlockNum, addr.partitionReferenceNum);
 906
 907                 mdata->s_bitmap_fe = udf_iget(sb, &addr);
 908
 909                 if (mdata->s_bitmap_fe == NULL) {
 910                         if (sb->s_flags & MS_RDONLY)
 911                                 udf_warning(sb, __func__, "bitmap inode efe "
 912                                         "not found but it's ok since the disc"
 913                                         " is mounted read-only");
 914                         else {
 915                                 udf_error(sb, __func__, "bitmap inode efe not "
 916                                         "found and attempted read-write mount");
 917                                 goto error_exit;
 918                         }
 919                 }
 920         }
 921
 922         udf_debug("udf_load_metadata_files Ok\n");
 923
 924         return 0;
 925
 926 error_exit:
 927         return 1;
 928 }
 929
 930 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
 931                              struct kernel_lb_addr *root)
 932 {
 933         struct fileSetDesc *fset;
 934
 935         fset = (struct fileSetDesc *)bh->b_data;
 936
 937         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
 938
 939         UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
 940
 941         udf_debug("Rootdir at block=%d, partition=%d\n",
 942                   root->logicalBlockNum, root->partitionReferenceNum);
 943 }
 944
 945 int udf_compute_nr_groups(struct super_block *sb, u32 partition)
 946 {
 947         struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
 948         return DIV_ROUND_UP(map->s_partition_len +
 949                             (sizeof(struct spaceBitmapDesc) << 3),
 950                             sb->s_blocksize * 8);
 951 }
 952
 953 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
 954 {
 955         struct udf_bitmap *bitmap;
 956         int nr_groups;
 957         int size;
 958
 959         nr_groups = udf_compute_nr_groups(sb, index);
 960         size = sizeof(struct udf_bitmap) +
 961                 (sizeof(struct buffer_head *) * nr_groups);
 962
 963         if (size <= PAGE_SIZE)
 964                 bitmap = kmalloc(size, GFP_KERNEL);
 965         else
 966                 bitmap = vmalloc(size); /* TODO: get rid of vmalloc */
 967
 968         if (bitmap == NULL) {
 969                 udf_error(sb, __func__,
 970                           "Unable to allocate space for bitmap "
 971                           "and %d buffer_head pointers", nr_groups);
 972                 return NULL;
 973         }
 974
 975         memset(bitmap, 0x00, size);
 976         bitmap->s_block_bitmap = (struct buffer_head **)(bitmap + 1);
 977         bitmap->s_nr_groups = nr_groups;
 978         return bitmap;
 979 }
 980
 981 static int udf_fill_partdesc_info(struct super_block *sb,
 982                 struct partitionDesc *p, int p_index)
 983 {
 984         struct udf_part_map *map;
 985         struct udf_sb_info *sbi = UDF_SB(sb);
 986         struct partitionHeaderDesc *phd;
 987
 988         map = &sbi->s_partmaps[p_index];
 989
 990         map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
 991         map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
 992
 993         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
 994                 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
 995         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
 996                 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
 997         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
 998                 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
 999         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
1000                 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
1001
1002         udf_debug("Partition (%d type %x) starts at physical %d, "
1003                   "block length %d\n", p_index,
1004                   map->s_partition_type, map->s_partition_root,
1005                   map->s_partition_len);
1006
1007         if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1008             strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
1009                 return 0;
1010
1011         phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1012         if (phd->unallocSpaceTable.extLength) {
1013                 struct kernel_lb_addr loc = {
1014                         .logicalBlockNum = le32_to_cpu(
1015                                 phd->unallocSpaceTable.extPosition),
1016                         .partitionReferenceNum = p_index,
1017                 };
1018
1019                 map->s_uspace.s_table = udf_iget(sb, &loc);
1020                 if (!map->s_uspace.s_table) {
1021                         udf_debug("cannot load unallocSpaceTable (part %d)\n",
1022                                         p_index);
1023                         return 1;
1024                 }
1025                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1026                 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
1027                                 p_index, map->s_uspace.s_table->i_ino);
1028         }
1029
1030         if (phd->unallocSpaceBitmap.extLength) {
1031                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1032                 if (!bitmap)
1033                         return 1;
1034                 map->s_uspace.s_bitmap = bitmap;
1035                 bitmap->s_extLength = le32_to_cpu(
1036                                 phd->unallocSpaceBitmap.extLength);
1037                 bitmap->s_extPosition = le32_to_cpu(
1038                                 phd->unallocSpaceBitmap.extPosition);
1039                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1040                 udf_debug("unallocSpaceBitmap (part %d) @ %d\n", p_index,
1041                                                 bitmap->s_extPosition);
1042         }
1043
1044         if (phd->partitionIntegrityTable.extLength)
1045                 udf_debug("partitionIntegrityTable (part %d)\n", p_index);
1046
1047         if (phd->freedSpaceTable.extLength) {
1048                 struct kernel_lb_addr loc = {
1049                         .logicalBlockNum = le32_to_cpu(
1050                                 phd->freedSpaceTable.extPosition),
1051                         .partitionReferenceNum = p_index,
1052                 };
1053
1054                 map->s_fspace.s_table = udf_iget(sb, &loc);
1055                 if (!map->s_fspace.s_table) {
1056                         udf_debug("cannot load freedSpaceTable (part %d)\n",
1057                                 p_index);
1058                         return 1;
1059                 }
1060
1061                 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
1062                 udf_debug("freedSpaceTable (part %d) @ %ld\n",
1063                                 p_index, map->s_fspace.s_table->i_ino);
1064         }
1065
1066         if (phd->freedSpaceBitmap.extLength) {
1067                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1068                 if (!bitmap)
1069                         return 1;
1070                 map->s_fspace.s_bitmap = bitmap;
1071                 bitmap->s_extLength = le32_to_cpu(
1072                                 phd->freedSpaceBitmap.extLength);
1073                 bitmap->s_extPosition = le32_to_cpu(
1074                                 phd->freedSpaceBitmap.extPosition);
1075                 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1076                 udf_debug("freedSpaceBitmap (part %d) @ %d\n", p_index,
1077                                         bitmap->s_extPosition);
1078         }
1079         return 0;
1080 }
1081
1082 static void udf_find_vat_block(struct super_block *sb, int p_index,
1083                                int type1_index, sector_t start_block)
1084 {
1085         struct udf_sb_info *sbi = UDF_SB(sb);
1086         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1087         sector_t vat_block;
1088         struct kernel_lb_addr ino;
1089
1090         /*
1091          * VAT file entry is in the last recorded block. Some broken disks have
1092          * it a few blocks before so try a bit harder...
1093          */
1094         ino.partitionReferenceNum = type1_index;
1095         for (vat_block = start_block;
1096              vat_block >= map->s_partition_root &&
1097              vat_block >= start_block - 3 &&
1098              !sbi->s_vat_inode; vat_block--) {
1099                 ino.logicalBlockNum = vat_block - map->s_partition_root;
1100                 sbi->s_vat_inode = udf_iget(sb, &ino);
1101         }
1102 }
1103
1104 static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1105 {
1106         struct udf_sb_info *sbi = UDF_SB(sb);
1107         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1108         struct buffer_head *bh = NULL;
1109         struct udf_inode_info *vati;
1110         uint32_t pos;
1111         struct virtualAllocationTable20 *vat20;
1112         sector_t blocks = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
1113
1114         udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block);
1115         if (!sbi->s_vat_inode &&
1116             sbi->s_last_block != blocks - 1) {
1117                 printk(KERN_NOTICE "UDF-fs: Failed to read VAT inode from the"
1118                        " last recorded block (%lu), retrying with the last "
1119                        "block of the device (%lu).\n",
1120                        (unsigned long)sbi->s_last_block,
1121                        (unsigned long)blocks - 1);
1122                 udf_find_vat_block(sb, p_index, type1_index, blocks - 1);
1123         }
1124         if (!sbi->s_vat_inode)
1125                 return 1;
1126
1127         if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1128                 map->s_type_specific.s_virtual.s_start_offset = 0;
1129                 map->s_type_specific.s_virtual.s_num_entries =
1130                         (sbi->s_vat_inode->i_size - 36) >> 2;
1131         } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1132                 vati = UDF_I(sbi->s_vat_inode);
1133                 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1134                         pos = udf_block_map(sbi->s_vat_inode, 0);
1135                         bh = sb_bread(sb, pos);
1136                         if (!bh)
1137                                 return 1;
1138                         vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1139                 } else {
1140                         vat20 = (struct virtualAllocationTable20 *)
1141                                                         vati->i_ext.i_data;
1142                 }
1143
1144                 map->s_type_specific.s_virtual.s_start_offset =
1145                         le16_to_cpu(vat20->lengthHeader);
1146                 map->s_type_specific.s_virtual.s_num_entries =
1147                         (sbi->s_vat_inode->i_size -
1148                                 map->s_type_specific.s_virtual.
1149                                         s_start_offset) >> 2;
1150                 brelse(bh);
1151         }
1152         return 0;
1153 }
1154
1155 static int udf_load_partdesc(struct super_block *sb, sector_t block)
1156 {
1157         struct buffer_head *bh;
1158         struct partitionDesc *p;
1159         struct udf_part_map *map;
1160         struct udf_sb_info *sbi = UDF_SB(sb);
1161         int i, type1_idx;
1162         uint16_t partitionNumber;
1163         uint16_t ident;
1164         int ret = 0;
1165
1166         bh = udf_read_tagged(sb, block, block, &ident);
1167         if (!bh)
1168                 return 1;
1169         if (ident != TAG_IDENT_PD)
1170                 goto out_bh;
1171
1172         p = (struct partitionDesc *)bh->b_data;
1173         partitionNumber = le16_to_cpu(p->partitionNumber);
1174
1175         /* First scan for TYPE1, SPARABLE and METADATA partitions */
1176         for (i = 0; i < sbi->s_partitions; i++) {
1177                 map = &sbi->s_partmaps[i];
1178                 udf_debug("Searching map: (%d == %d)\n",
1179                           map->s_partition_num, partitionNumber);
1180                 if (map->s_partition_num == partitionNumber &&
1181                     (map->s_partition_type == UDF_TYPE1_MAP15 ||
1182                      map->s_partition_type == UDF_SPARABLE_MAP15))
1183                         break;
1184         }
1185
1186         if (i >= sbi->s_partitions) {
1187                 udf_debug("Partition (%d) not found in partition map\n",
1188                           partitionNumber);
1189                 goto out_bh;
1190         }
1191
1192         ret = udf_fill_partdesc_info(sb, p, i);
1193
1194         /*
1195          * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1196          * PHYSICAL partitions are already set up
1197          */
1198         type1_idx = i;
1199         for (i = 0; i < sbi->s_partitions; i++) {
1200                 map = &sbi->s_partmaps[i];
1201
1202                 if (map->s_partition_num == partitionNumber &&
1203                     (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1204                      map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1205                      map->s_partition_type == UDF_METADATA_MAP25))
1206                         break;
1207         }
1208
1209         if (i >= sbi->s_partitions)
1210                 goto out_bh;
1211
1212         ret = udf_fill_partdesc_info(sb, p, i);
1213         if (ret)
1214                 goto out_bh;
1215
1216         if (map->s_partition_type == UDF_METADATA_MAP25) {
1217                 ret = udf_load_metadata_files(sb, i);
1218                 if (ret) {
1219                         printk(KERN_ERR "UDF-fs: error loading MetaData "
1220                         "partition map %d\n", i);
1221                         goto out_bh;
1222                 }
1223         } else {
1224                 ret = udf_load_vat(sb, i, type1_idx);
1225                 if (ret)
1226                         goto out_bh;
1227                 /*
1228                  * Mark filesystem read-only if we have a partition with
1229                  * virtual map since we don't handle writing to it (we
1230                  * overwrite blocks instead of relocating them).
1231                  */
1232                 sb->s_flags |= MS_RDONLY;
1233                 printk(KERN_NOTICE "UDF-fs: Filesystem marked read-only "
1234                         "because writing to pseudooverwrite partition is "
1235                         "not implemented.\n");
1236         }
1237 out_bh:
1238         /* In case loading failed, we handle cleanup in udf_fill_super */
1239         brelse(bh);
1240         return ret;
1241 }
1242
1243 static int udf_load_logicalvol(struct super_block *sb, sector_t block,
1244                                struct kernel_lb_addr *fileset)
1245 {
1246         struct logicalVolDesc *lvd;
1247         int i, j, offset;
1248         uint8_t type;
1249         struct udf_sb_info *sbi = UDF_SB(sb);
1250         struct genericPartitionMap *gpm;
1251         uint16_t ident;
1252         struct buffer_head *bh;
1253         int ret = 0;
1254
1255         bh = udf_read_tagged(sb, block, block, &ident);
1256         if (!bh)
1257                 return 1;
1258         BUG_ON(ident != TAG_IDENT_LVD);
1259         lvd = (struct logicalVolDesc *)bh->b_data;
1260
1261         i = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1262         if (i != 0) {
1263                 ret = i;
1264                 goto out_bh;
1265         }
1266
1267         for (i = 0, offset = 0;
1268              i < sbi->s_partitions && offset < le32_to_cpu(lvd->mapTableLength);
1269              i++, offset += gpm->partitionMapLength) {
1270                 struct udf_part_map *map = &sbi->s_partmaps[i];
1271                 gpm = (struct genericPartitionMap *)
1272                                 &(lvd->partitionMaps[offset]);
1273                 type = gpm->partitionMapType;
1274                 if (type == 1) {
1275                         struct genericPartitionMap1 *gpm1 =
1276                                 (struct genericPartitionMap1 *)gpm;
1277                         map->s_partition_type = UDF_TYPE1_MAP15;
1278                         map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1279                         map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1280                         map->s_partition_func = NULL;
1281                 } else if (type == 2) {
1282                         struct udfPartitionMap2 *upm2 =
1283                                                 (struct udfPartitionMap2 *)gpm;
1284                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1285                                                 strlen(UDF_ID_VIRTUAL))) {
1286                                 u16 suf =
1287                                         le16_to_cpu(((__le16 *)upm2->partIdent.
1288                                                         identSuffix)[0]);
1289                                 if (suf < 0x0200) {
1290                                         map->s_partition_type =
1291                                                         UDF_VIRTUAL_MAP15;
1292                                         map->s_partition_func =
1293                                                         udf_get_pblock_virt15;
1294                                 } else {
1295                                         map->s_partition_type =
1296                                                         UDF_VIRTUAL_MAP20;
1297                                         map->s_partition_func =
1298                                                         udf_get_pblock_virt20;
1299                                 }
1300                         } else if (!strncmp(upm2->partIdent.ident,
1301                                                 UDF_ID_SPARABLE,
1302                                                 strlen(UDF_ID_SPARABLE))) {
1303                                 uint32_t loc;
1304                                 struct sparingTable *st;
1305                                 struct sparablePartitionMap *spm =
1306                                         (struct sparablePartitionMap *)gpm;
1307
1308                                 map->s_partition_type = UDF_SPARABLE_MAP15;
1309                                 map->s_type_specific.s_sparing.s_packet_len =
1310                                                 le16_to_cpu(spm->packetLength);
1311                                 for (j = 0; j < spm->numSparingTables; j++) {
1312                                         struct buffer_head *bh2;
1313
1314                                         loc = le32_to_cpu(
1315                                                 spm->locSparingTable[j]);
1316                                         bh2 = udf_read_tagged(sb, loc, loc,
1317                                                              &ident);
1318                                         map->s_type_specific.s_sparing.
1319                                                         s_spar_map[j] = bh2;
1320
1321                                         if (bh2 == NULL)
1322                                                 continue;
1323
1324                                         st = (struct sparingTable *)bh2->b_data;
1325                                         if (ident != 0 || strncmp(
1326                                                 st->sparingIdent.ident,
1327                                                 UDF_ID_SPARING,
1328                                                 strlen(UDF_ID_SPARING))) {
1329                                                 brelse(bh2);
1330                                                 map->s_type_specific.s_sparing.
1331                                                         s_spar_map[j] = NULL;
1332                                         }
1333                                 }
1334                                 map->s_partition_func = udf_get_pblock_spar15;
1335                         } else if (!strncmp(upm2->partIdent.ident,
1336                                                 UDF_ID_METADATA,
1337                                                 strlen(UDF_ID_METADATA))) {
1338                                 struct udf_meta_data *mdata =
1339                                         &map->s_type_specific.s_metadata;
1340                                 struct metadataPartitionMap *mdm =
1341                                                 (struct metadataPartitionMap *)
1342                                                 &(lvd->partitionMaps[offset]);
1343                                 udf_debug("Parsing Logical vol part %d "
1344                                         "type %d  id=%s\n", i, type,
1345                                         UDF_ID_METADATA);
1346
1347                                 map->s_partition_type = UDF_METADATA_MAP25;
1348                                 map->s_partition_func = udf_get_pblock_meta25;
1349
1350                                 mdata->s_meta_file_loc   =
1351                                         le32_to_cpu(mdm->metadataFileLoc);
1352                                 mdata->s_mirror_file_loc =
1353                                         le32_to_cpu(mdm->metadataMirrorFileLoc);
1354                                 mdata->s_bitmap_file_loc =
1355                                         le32_to_cpu(mdm->metadataBitmapFileLoc);
1356                                 mdata->s_alloc_unit_size =
1357                                         le32_to_cpu(mdm->allocUnitSize);
1358                                 mdata->s_align_unit_size =
1359                                         le16_to_cpu(mdm->alignUnitSize);
1360                                 mdata->s_dup_md_flag     =
1361                                         mdm->flags & 0x01;
1362
1363                                 udf_debug("Metadata Ident suffix=0x%x\n",
1364                                         (le16_to_cpu(
1365                                          ((__le16 *)
1366                                               mdm->partIdent.identSuffix)[0])));
1367                                 udf_debug("Metadata part num=%d\n",
1368                                         le16_to_cpu(mdm->partitionNum));
1369                                 udf_debug("Metadata part alloc unit size=%d\n",
1370                                         le32_to_cpu(mdm->allocUnitSize));
1371                                 udf_debug("Metadata file loc=%d\n",
1372                                         le32_to_cpu(mdm->metadataFileLoc));
1373                                 udf_debug("Mirror file loc=%d\n",
1374                                        le32_to_cpu(mdm->metadataMirrorFileLoc));
1375                                 udf_debug("Bitmap file loc=%d\n",
1376                                        le32_to_cpu(mdm->metadataBitmapFileLoc));
1377                                 udf_debug("Duplicate Flag: %d %d\n",
1378                                         mdata->s_dup_md_flag, mdm->flags);
1379                         } else {
1380                                 udf_debug("Unknown ident: %s\n",
1381                                           upm2->partIdent.ident);
1382                                 continue;
1383                         }
1384                         map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1385                         map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1386                 }
1387                 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1388                           i, map->s_partition_num, type,
1389                           map->s_volumeseqnum);
1390         }
1391
1392         if (fileset) {
1393                 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
1394
1395                 *fileset = lelb_to_cpu(la->extLocation);
1396                 udf_debug("FileSet found in LogicalVolDesc at block=%d, "
1397                           "partition=%d\n", fileset->logicalBlockNum,
1398                           fileset->partitionReferenceNum);
1399         }
1400         if (lvd->integritySeqExt.extLength)
1401                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1402
1403 out_bh:
1404         brelse(bh);
1405         return ret;
1406 }
1407
1408 /*
1409  * udf_load_logicalvolint
1410  *
1411  */
1412 static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
1413 {
1414         struct buffer_head *bh = NULL;
1415         uint16_t ident;
1416         struct udf_sb_info *sbi = UDF_SB(sb);
1417         struct logicalVolIntegrityDesc *lvid;
1418
1419         while (loc.extLength > 0 &&
1420                (bh = udf_read_tagged(sb, loc.extLocation,
1421                                      loc.extLocation, &ident)) &&
1422                ident == TAG_IDENT_LVID) {
1423                 sbi->s_lvid_bh = bh;
1424                 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1425
1426                 if (lvid->nextIntegrityExt.extLength)
1427                         udf_load_logicalvolint(sb,
1428                                 leea_to_cpu(lvid->nextIntegrityExt));
1429
1430                 if (sbi->s_lvid_bh != bh)
1431                         brelse(bh);
1432                 loc.extLength -= sb->s_blocksize;
1433                 loc.extLocation++;
1434         }
1435         if (sbi->s_lvid_bh != bh)
1436                 brelse(bh);
1437 }
1438
1439 /*
1440  * udf_process_sequence
1441  *
1442  * PURPOSE
1443  *      Process a main/reserve volume descriptor sequence.
1444  *
1445  * PRE-CONDITIONS
1446  *      sb                      Pointer to _locked_ superblock.
1447  *      block                   First block of first extent of the sequence.
1448  *      lastblock               Lastblock of first extent of the sequence.
1449  *
1450  * HISTORY
1451  *      July 1, 1997 - Andrew E. Mileski
1452  *      Written, tested, and released.
1453  */
1454 static noinline int udf_process_sequence(struct super_block *sb, long block,
1455                                 long lastblock, struct kernel_lb_addr *fileset)
1456 {
1457         struct buffer_head *bh = NULL;
1458         struct udf_vds_record vds[VDS_POS_LENGTH];
1459         struct udf_vds_record *curr;
1460         struct generic_desc *gd;
1461         struct volDescPtr *vdp;
1462         int done = 0;
1463         uint32_t vdsn;
1464         uint16_t ident;
1465         long next_s = 0, next_e = 0;
1466
1467         memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1468
1469         /*
1470          * Read the main descriptor sequence and find which descriptors
1471          * are in it.
1472          */
1473         for (; (!done && block <= lastblock); block++) {
1474
1475                 bh = udf_read_tagged(sb, block, block, &ident);
1476                 if (!bh) {
1477                         printk(KERN_ERR "udf: Block %Lu of volume descriptor "
1478                                "sequence is corrupted or we could not read "
1479                                "it.\n", (unsigned long long)block);
1480                         return 1;
1481                 }
1482
1483                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1484                 gd = (struct generic_desc *)bh->b_data;
1485                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1486                 switch (ident) {
1487                 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1488                         curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1489                         if (vdsn >= curr->volDescSeqNum) {
1490                                 curr->volDescSeqNum = vdsn;
1491                                 curr->block = block;
1492                         }
1493                         break;
1494                 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1495                         curr = &vds[VDS_POS_VOL_DESC_PTR];
1496                         if (vdsn >= curr->volDescSeqNum) {
1497                                 curr->volDescSeqNum = vdsn;
1498                                 curr->block = block;
1499
1500                                 vdp = (struct volDescPtr *)bh->b_data;
1501                                 next_s = le32_to_cpu(
1502                                         vdp->nextVolDescSeqExt.extLocation);
1503                                 next_e = le32_to_cpu(
1504                                         vdp->nextVolDescSeqExt.extLength);
1505                                 next_e = next_e >> sb->s_blocksize_bits;
1506                                 next_e += next_s;
1507                         }
1508                         break;
1509                 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1510                         curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1511                         if (vdsn >= curr->volDescSeqNum) {
1512                                 curr->volDescSeqNum = vdsn;
1513                                 curr->block = block;
1514                         }
1515                         break;
1516                 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1517                         curr = &vds[VDS_POS_PARTITION_DESC];
1518                         if (!curr->block)
1519                                 curr->block = block;
1520                         break;
1521                 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1522                         curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1523                         if (vdsn >= curr->volDescSeqNum) {
1524                                 curr->volDescSeqNum = vdsn;
1525                                 curr->block = block;
1526                         }
1527                         break;
1528                 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1529                         curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1530                         if (vdsn >= curr->volDescSeqNum) {
1531                                 curr->volDescSeqNum = vdsn;
1532                                 curr->block = block;
1533                         }
1534                         break;
1535                 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1536                         vds[VDS_POS_TERMINATING_DESC].block = block;
1537                         if (next_e) {
1538                                 block = next_s;
1539                                 lastblock = next_e;
1540                                 next_s = next_e = 0;
1541                         } else
1542                                 done = 1;
1543                         break;
1544                 }
1545                 brelse(bh);
1546         }
1547         /*
1548          * Now read interesting descriptors again and process them
1549          * in a suitable order
1550          */
1551         if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1552                 printk(KERN_ERR "udf: Primary Volume Descriptor not found!\n");
1553                 return 1;
1554         }
1555         if (udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block))
1556                 return 1;
1557
1558         if (vds[VDS_POS_LOGICAL_VOL_DESC].block && udf_load_logicalvol(sb,
1559             vds[VDS_POS_LOGICAL_VOL_DESC].block, fileset))
1560                 return 1;
1561
1562         if (vds[VDS_POS_PARTITION_DESC].block) {
1563                 /*
1564                  * We rescan the whole descriptor sequence to find
1565                  * partition descriptor blocks and process them.
1566                  */
1567                 for (block = vds[VDS_POS_PARTITION_DESC].block;
1568                      block < vds[VDS_POS_TERMINATING_DESC].block;
1569                      block++)
1570                         if (udf_load_partdesc(sb, block))
1571                                 return 1;
1572         }
1573
1574         return 0;
1575 }
1576
1577 static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh,
1578                              struct kernel_lb_addr *fileset)
1579 {
1580         struct anchorVolDescPtr *anchor;
1581         long main_s, main_e, reserve_s, reserve_e;
1582         struct udf_sb_info *sbi;
1583
1584         sbi = UDF_SB(sb);
1585         anchor = (struct anchorVolDescPtr *)bh->b_data;
1586
1587         /* Locate the main sequence */
1588         main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1589         main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1590         main_e = main_e >> sb->s_blocksize_bits;
1591         main_e += main_s;
1592
1593         /* Locate the reserve sequence */
1594         reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1595         reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1596         reserve_e = reserve_e >> sb->s_blocksize_bits;
1597         reserve_e += reserve_s;
1598
1599         /* Process the main & reserve sequences */
1600         /* responsible for finding the PartitionDesc(s) */
1601         if (!udf_process_sequence(sb, main_s, main_e, fileset))
1602                 return 1;
1603         return !udf_process_sequence(sb, reserve_s, reserve_e, fileset);
1604 }
1605
1606 /*
1607  * Check whether there is an anchor block in the given block and
1608  * load Volume Descriptor Sequence if so.
1609  */
1610 static int udf_check_anchor_block(struct super_block *sb, sector_t block,
1611                                   struct kernel_lb_addr *fileset)
1612 {
1613         struct buffer_head *bh;
1614         uint16_t ident;
1615         int ret;
1616
1617         if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
1618             udf_fixed_to_variable(block) >=
1619             sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits)
1620                 return 0;
1621
1622         bh = udf_read_tagged(sb, block, block, &ident);
1623         if (!bh)
1624                 return 0;
1625         if (ident != TAG_IDENT_AVDP) {
1626                 brelse(bh);
1627                 return 0;
1628         }
1629         ret = udf_load_sequence(sb, bh, fileset);
1630         brelse(bh);
1631         return ret;
1632 }
1633
1634 /* Search for an anchor volume descriptor pointer */
1635 static sector_t udf_scan_anchors(struct super_block *sb, sector_t lastblock,
1636                                  struct kernel_lb_addr *fileset)
1637 {
1638         sector_t last[6];
1639         int i;
1640         struct udf_sb_info *sbi = UDF_SB(sb);
1641         int last_count = 0;
1642
1643         /* First try user provided anchor */
1644         if (sbi->s_anchor) {
1645                 if (udf_check_anchor_block(sb, sbi->s_anchor, fileset))
1646                         return lastblock;
1647         }
1648         /*
1649          * according to spec, anchor is in either:
1650          *     block 256
1651          *     lastblock-256
1652          *     lastblock
1653          *  however, if the disc isn't closed, it could be 512.
1654          */
1655         if (udf_check_anchor_block(sb, sbi->s_session + 256, fileset))
1656                 return lastblock;
1657         /*
1658          * The trouble is which block is the last one. Drives often misreport
1659          * this so we try various possibilities.
1660          */
1661         last[last_count++] = lastblock;
1662         if (lastblock >= 1)
1663                 last[last_count++] = lastblock - 1;
1664         last[last_count++] = lastblock + 1;
1665         if (lastblock >= 2)
1666                 last[last_count++] = lastblock - 2;
1667         if (lastblock >= 150)
1668                 last[last_count++] = lastblock - 150;
1669         if (lastblock >= 152)
1670                 last[last_count++] = lastblock - 152;
1671
1672         for (i = 0; i < last_count; i++) {
1673                 if (last[i] >= sb->s_bdev->bd_inode->i_size >>
1674                                 sb->s_blocksize_bits)
1675                         continue;
1676                 if (udf_check_anchor_block(sb, last[i], fileset))
1677                         return last[i];
1678                 if (last[i] < 256)
1679                         continue;
1680                 if (udf_check_anchor_block(sb, last[i] - 256, fileset))
1681                         return last[i];
1682         }
1683
1684         /* Finally try block 512 in case media is open */
1685         if (udf_check_anchor_block(sb, sbi->s_session + 512, fileset))
1686                 return last[0];
1687         return 0;
1688 }
1689
1690 /*
1691  * Find an anchor volume descriptor and load Volume Descriptor Sequence from
1692  * area specified by it. The function expects sbi->s_lastblock to be the last
1693  * block on the media.
1694  *
1695  * Return 1 if ok, 0 if not found.
1696  *
1697  */
1698 static int udf_find_anchor(struct super_block *sb,
1699                            struct kernel_lb_addr *fileset)
1700 {
1701         sector_t lastblock;
1702         struct udf_sb_info *sbi = UDF_SB(sb);
1703
1704         lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1705         if (lastblock)
1706                 goto out;
1707
1708         /* No anchor found? Try VARCONV conversion of block numbers */
1709         UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
1710         /* Firstly, we try to not convert number of the last block */
1711         lastblock = udf_scan_anchors(sb,
1712                                 udf_variable_to_fixed(sbi->s_last_block),
1713                                 fileset);
1714         if (lastblock)
1715                 goto out;
1716
1717         /* Secondly, we try with converted number of the last block */
1718         lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1719         if (!lastblock) {
1720                 /* VARCONV didn't help. Clear it. */
1721                 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
1722                 return 0;
1723         }
1724 out:
1725         sbi->s_last_block = lastblock;
1726         return 1;
1727 }
1728
1729 /*
1730  * Check Volume Structure Descriptor, find Anchor block and load Volume
1731  * Descriptor Sequence
1732  */
1733 static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
1734                         int silent, struct kernel_lb_addr *fileset)
1735 {
1736         struct udf_sb_info *sbi = UDF_SB(sb);
1737         loff_t nsr_off;
1738
1739         if (!sb_set_blocksize(sb, uopt->blocksize)) {
1740                 if (!silent)
1741                         printk(KERN_WARNING "UDF-fs: Bad block size\n");
1742                 return 0;
1743         }
1744         sbi->s_last_block = uopt->lastblock;
1745         if (!uopt->novrs) {
1746                 /* Check that it is NSR02 compliant */
1747                 nsr_off = udf_check_vsd(sb);
1748                 if (!nsr_off) {
1749                         if (!silent)
1750                                 printk(KERN_WARNING "UDF-fs: No VRS found\n");
1751                         return 0;
1752                 }
1753                 if (nsr_off == -1)
1754                         udf_debug("Failed to read byte 32768. Assuming open "
1755                                   "disc. Skipping validity check\n");
1756                 if (!sbi->s_last_block)
1757                         sbi->s_last_block = udf_get_last_block(sb);
1758         } else {
1759                 udf_debug("Validity check skipped because of novrs option\n");
1760         }
1761
1762         /* Look for anchor block and load Volume Descriptor Sequence */
1763         sbi->s_anchor = uopt->anchor;
1764         if (!udf_find_anchor(sb, fileset)) {
1765                 if (!silent)
1766                         printk(KERN_WARNING "UDF-fs: No anchor found\n");
1767                 return 0;
1768         }
1769         return 1;
1770 }
1771
1772 static void udf_open_lvid(struct super_block *sb)
1773 {
1774         struct udf_sb_info *sbi = UDF_SB(sb);
1775         struct buffer_head *bh = sbi->s_lvid_bh;
1776         struct logicalVolIntegrityDesc *lvid;
1777         struct logicalVolIntegrityDescImpUse *lvidiu;
1778
1779         if (!bh)
1780                 return;
1781         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1782         lvidiu = udf_sb_lvidiu(sbi);
1783
1784         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1785         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1786         udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
1787                                 CURRENT_TIME);
1788         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN);
1789
1790         lvid->descTag.descCRC = cpu_to_le16(
1791                 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1792                         le16_to_cpu(lvid->descTag.descCRCLength)));
1793
1794         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1795         mark_buffer_dirty(bh);
1796         sbi->s_lvid_dirty = 0;
1797 }
1798
1799 static void udf_close_lvid(struct super_block *sb)
1800 {
1801         struct udf_sb_info *sbi = UDF_SB(sb);
1802         struct buffer_head *bh = sbi->s_lvid_bh;
1803         struct logicalVolIntegrityDesc *lvid;
1804         struct logicalVolIntegrityDescImpUse *lvidiu;
1805
1806         if (!bh)
1807                 return;
1808
1809         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1810         lvidiu = udf_sb_lvidiu(sbi);
1811         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1812         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1813         udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
1814         if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1815                 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1816         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1817                 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1818         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
1819                 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
1820         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1821
1822         lvid->descTag.descCRC = cpu_to_le16(
1823                         crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1824                                 le16_to_cpu(lvid->descTag.descCRCLength)));
1825
1826         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1827         mark_buffer_dirty(bh);
1828         sbi->s_lvid_dirty = 0;
1829 }
1830
1831 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
1832 {
1833         int i;
1834         int nr_groups = bitmap->s_nr_groups;
1835         int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
1836                                                 nr_groups);
1837
1838         for (i = 0; i < nr_groups; i++)
1839                 if (bitmap->s_block_bitmap[i])
1840                         brelse(bitmap->s_block_bitmap[i]);
1841
1842         if (size <= PAGE_SIZE)
1843                 kfree(bitmap);
1844         else
1845                 vfree(bitmap);
1846 }
1847
1848 static void udf_free_partition(struct udf_part_map *map)
1849 {
1850         int i;
1851         struct udf_meta_data *mdata;
1852
1853         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1854                 iput(map->s_uspace.s_table);
1855         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1856                 iput(map->s_fspace.s_table);
1857         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1858                 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
1859         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1860                 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
1861         if (map->s_partition_type == UDF_SPARABLE_MAP15)
1862                 for (i = 0; i < 4; i++)
1863                         brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
1864         else if (map->s_partition_type == UDF_METADATA_MAP25) {
1865                 mdata = &map->s_type_specific.s_metadata;
1866                 iput(mdata->s_metadata_fe);
1867                 mdata->s_metadata_fe = NULL;
1868
1869                 iput(mdata->s_mirror_fe);
1870                 mdata->s_mirror_fe = NULL;
1871
1872                 iput(mdata->s_bitmap_fe);
1873                 mdata->s_bitmap_fe = NULL;
1874         }
1875 }
1876
1877 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1878 {
1879         int i;
1880         int ret;
1881         struct inode *inode = NULL;
1882         struct udf_options uopt;
1883         struct kernel_lb_addr rootdir, fileset;
1884         struct udf_sb_info *sbi;
1885
1886         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1887         uopt.uid = -1;
1888         uopt.gid = -1;
1889         uopt.umask = 0;
1890         uopt.fmode = UDF_INVALID_MODE;
1891         uopt.dmode = UDF_INVALID_MODE;
1892
1893         sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1894         if (!sbi)
1895                 return -ENOMEM;
1896
1897         sb->s_fs_info = sbi;
1898
1899         mutex_init(&sbi->s_alloc_mutex);
1900
1901         if (!udf_parse_options((char *)options, &uopt, false))
1902                 goto error_out;
1903
1904         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1905             uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
1906                 udf_error(sb, "udf_read_super",
1907                           "utf8 cannot be combined with iocharset\n");
1908                 goto error_out;
1909         }
1910 #ifdef CONFIG_UDF_NLS
1911         if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1912                 uopt.nls_map = load_nls_default();
1913                 if (!uopt.nls_map)
1914                         uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1915                 else
1916                         udf_debug("Using default NLS map\n");
1917         }
1918 #endif
1919         if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1920                 uopt.flags |= (1 << UDF_FLAG_UTF8);
1921
1922         fileset.logicalBlockNum = 0xFFFFFFFF;
1923         fileset.partitionReferenceNum = 0xFFFF;
1924
1925         sbi->s_flags = uopt.flags;
1926         sbi->s_uid = uopt.uid;
1927         sbi->s_gid = uopt.gid;
1928         sbi->s_umask = uopt.umask;
1929         sbi->s_fmode = uopt.fmode;
1930         sbi->s_dmode = uopt.dmode;
1931         sbi->s_nls_map = uopt.nls_map;
1932
1933         if (uopt.session == 0xFFFFFFFF)
1934                 sbi->s_session = udf_get_last_session(sb);
1935         else
1936                 sbi->s_session = uopt.session;
1937
1938         udf_debug("Multi-session=%d\n", sbi->s_session);
1939
1940         /* Fill in the rest of the superblock */
1941         sb->s_op = &udf_sb_ops;
1942         sb->s_export_op = &udf_export_ops;
1943
1944         sb->s_dirt = 0;
1945         sb->s_magic = UDF_SUPER_MAGIC;
1946         sb->s_time_gran = 1000;
1947
1948         if (uopt.flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) {
1949                 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1950         } else {
1951                 uopt.blocksize = bdev_logical_block_size(sb->s_bdev);
1952                 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1953                 if (!ret && uopt.blocksize != UDF_DEFAULT_BLOCKSIZE) {
1954                         if (!silent)
1955                                 printk(KERN_NOTICE
1956                                        "UDF-fs: Rescanning with blocksize "
1957                                        "%d\n", UDF_DEFAULT_BLOCKSIZE);
1958                         uopt.blocksize = UDF_DEFAULT_BLOCKSIZE;
1959                         ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1960                 }
1961         }
1962         if (!ret) {
1963                 printk(KERN_WARNING "UDF-fs: No partition found (1)\n");
1964                 goto error_out;
1965         }
1966
1967         udf_debug("Lastblock=%d\n", sbi->s_last_block);
1968
1969         if (sbi->s_lvid_bh) {
1970                 struct logicalVolIntegrityDescImpUse *lvidiu =
1971                                                         udf_sb_lvidiu(sbi);
1972                 uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
1973                 uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
1974                 /* uint16_t maxUDFWriteRev =
1975                                 le16_to_cpu(lvidiu->maxUDFWriteRev); */
1976
1977                 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
1978                         printk(KERN_ERR "UDF-fs: minUDFReadRev=%x "
1979                                         "(max is %x)\n",
1980                                le16_to_cpu(lvidiu->minUDFReadRev),
1981                                UDF_MAX_READ_VERSION);
1982                         goto error_out;
1983                 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
1984                         sb->s_flags |= MS_RDONLY;
1985
1986                 sbi->s_udfrev = minUDFWriteRev;
1987
1988                 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1989                         UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
1990                 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
1991                         UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
1992         }
1993
1994         if (!sbi->s_partitions) {
1995                 printk(KERN_WARNING "UDF-fs: No partition found (2)\n");
1996                 goto error_out;
1997         }
1998
1999         if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
2000                         UDF_PART_FLAG_READ_ONLY) {
2001                 printk(KERN_NOTICE "UDF-fs: Partition marked readonly; "
2002                                    "forcing readonly mount\n");
2003                 sb->s_flags |= MS_RDONLY;
2004         }
2005
2006         if (udf_find_fileset(sb, &fileset, &rootdir)) {
2007                 printk(KERN_WARNING "UDF-fs: No fileset found\n");
2008                 goto error_out;
2009         }
2010
2011         if (!silent) {
2012                 struct timestamp ts;
2013                 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
2014                 udf_info("UDF: Mounting volume '%s', "
2015                          "timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
2016                          sbi->s_volume_ident, le16_to_cpu(ts.year), ts.month, ts.day,
2017                          ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
2018         }
2019         if (!(sb->s_flags & MS_RDONLY))
2020                 udf_open_lvid(sb);
2021
2022         /* Assign the root inode */
2023         /* assign inodes by physical block number */
2024         /* perhaps it's not extensible enough, but for now ... */
2025         inode = udf_iget(sb, &rootdir);
2026         if (!inode) {
2027                 printk(KERN_ERR "UDF-fs: Error in udf_iget, block=%d, "
2028                                 "partition=%d\n",
2029                        rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
2030                 goto error_out;
2031         }
2032
2033         /* Allocate a dentry for the root inode */
2034         sb->s_root = d_alloc_root(inode);
2035         if (!sb->s_root) {
2036                 printk(KERN_ERR "UDF-fs: Couldn't allocate root dentry\n");
2037                 iput(inode);
2038                 goto error_out;
2039         }
2040         sb->s_maxbytes = MAX_LFS_FILESIZE;
2041         return 0;
2042
2043 error_out:
2044         if (sbi->s_vat_inode)
2045                 iput(sbi->s_vat_inode);
2046         if (sbi->s_partitions)
2047                 for (i = 0; i < sbi->s_partitions; i++)
2048                         udf_free_partition(&sbi->s_partmaps[i]);
2049 #ifdef CONFIG_UDF_NLS
2050         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2051                 unload_nls(sbi->s_nls_map);
2052 #endif
2053         if (!(sb->s_flags & MS_RDONLY))
2054                 udf_close_lvid(sb);
2055         brelse(sbi->s_lvid_bh);
2056
2057         kfree(sbi->s_partmaps);
2058         kfree(sbi);
2059         sb->s_fs_info = NULL;
2060
2061         return -EINVAL;
2062 }
2063
2064 static void udf_error(struct super_block *sb, const char *function,
2065                       const char *fmt, ...)
2066 {
2067         va_list args;
2068
2069         if (!(sb->s_flags & MS_RDONLY)) {
2070                 /* mark sb error */
2071                 sb->s_dirt = 1;
2072         }
2073         va_start(args, fmt);
2074         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2075         va_end(args);
2076         printk(KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
2077                 sb->s_id, function, error_buf);
2078 }
2079
2080 void udf_warning(struct super_block *sb, const char *function,
2081                  const char *fmt, ...)
2082 {
2083         va_list args;
2084
2085         va_start(args, fmt);
2086         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2087         va_end(args);
2088         printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
2089                sb->s_id, function, error_buf);
2090 }
2091
2092 static void udf_put_super(struct super_block *sb)
2093 {
2094         int i;
2095         struct udf_sb_info *sbi;
2096
2097         sbi = UDF_SB(sb);
2098
2099         lock_kernel();
2100
2101         if (sbi->s_vat_inode)
2102                 iput(sbi->s_vat_inode);
2103         if (sbi->s_partitions)
2104                 for (i = 0; i < sbi->s_partitions; i++)
2105                         udf_free_partition(&sbi->s_partmaps[i]);
2106 #ifdef CONFIG_UDF_NLS
2107         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2108                 unload_nls(sbi->s_nls_map);
2109 #endif
2110         if (!(sb->s_flags & MS_RDONLY))
2111                 udf_close_lvid(sb);
2112         brelse(sbi->s_lvid_bh);
2113         kfree(sbi->s_partmaps);
2114         kfree(sb->s_fs_info);
2115         sb->s_fs_info = NULL;
2116
2117         unlock_kernel();
2118 }
2119
2120 static int udf_sync_fs(struct super_block *sb, int wait)
2121 {
2122         struct udf_sb_info *sbi = UDF_SB(sb);
2123
2124         mutex_lock(&sbi->s_alloc_mutex);
2125         if (sbi->s_lvid_dirty) {
2126                 /*
2127                  * Blockdevice will be synced later so we don't have to submit
2128                  * the buffer for IO
2129                  */
2130                 mark_buffer_dirty(sbi->s_lvid_bh);
2131                 sb->s_dirt = 0;
2132                 sbi->s_lvid_dirty = 0;
2133         }
2134         mutex_unlock(&sbi->s_alloc_mutex);
2135
2136         return 0;
2137 }
2138
2139 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
2140 {
2141         struct super_block *sb = dentry->d_sb;
2142         struct udf_sb_info *sbi = UDF_SB(sb);
2143         struct logicalVolIntegrityDescImpUse *lvidiu;
2144         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
2145
2146         if (sbi->s_lvid_bh != NULL)
2147                 lvidiu = udf_sb_lvidiu(sbi);
2148         else
2149                 lvidiu = NULL;
2150
2151         buf->f_type = UDF_SUPER_MAGIC;
2152         buf->f_bsize = sb->s_blocksize;
2153         buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
2154         buf->f_bfree = udf_count_free(sb);
2155         buf->f_bavail = buf->f_bfree;
2156         buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2157                                           le32_to_cpu(lvidiu->numDirs)) : 0)
2158                         + buf->f_bfree;
2159         buf->f_ffree = buf->f_bfree;
2160         buf->f_namelen = UDF_NAME_LEN - 2;
2161         buf->f_fsid.val[0] = (u32)id;
2162         buf->f_fsid.val[1] = (u32)(id >> 32);
2163
2164         return 0;
2165 }
2166
2167 static unsigned int udf_count_free_bitmap(struct super_block *sb,
2168                                           struct udf_bitmap *bitmap)
2169 {
2170         struct buffer_head *bh = NULL;
2171         unsigned int accum = 0;
2172         int index;
2173         int block = 0, newblock;
2174         struct kernel_lb_addr loc;
2175         uint32_t bytes;
2176         uint8_t *ptr;
2177         uint16_t ident;
2178         struct spaceBitmapDesc *bm;
2179
2180         lock_kernel();
2181
2182         loc.logicalBlockNum = bitmap->s_extPosition;
2183         loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
2184         bh = udf_read_ptagged(sb, &loc, 0, &ident);
2185
2186         if (!bh) {
2187                 printk(KERN_ERR "udf: udf_count_free failed\n");
2188                 goto out;
2189         } else if (ident != TAG_IDENT_SBD) {
2190                 brelse(bh);
2191                 printk(KERN_ERR "udf: udf_count_free failed\n");
2192                 goto out;
2193         }
2194
2195         bm = (struct spaceBitmapDesc *)bh->b_data;
2196         bytes = le32_to_cpu(bm->numOfBytes);
2197         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2198         ptr = (uint8_t *)bh->b_data;
2199
2200         while (bytes > 0) {
2201                 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2202                 accum += bitmap_weight((const unsigned long *)(ptr + index),
2203                                         cur_bytes * 8);
2204                 bytes -= cur_bytes;
2205                 if (bytes) {
2206                         brelse(bh);
2207                         newblock = udf_get_lb_pblock(sb, &loc, ++block);
2208                         bh = udf_tread(sb, newblock);
2209                         if (!bh) {
2210                                 udf_debug("read failed\n");
2211                                 goto out;
2212                         }
2213                         index = 0;
2214                         ptr = (uint8_t *)bh->b_data;
2215                 }
2216         }
2217         brelse(bh);
2218
2219 out:
2220         unlock_kernel();
2221
2222         return accum;
2223 }
2224
2225 static unsigned int udf_count_free_table(struct super_block *sb,
2226                                          struct inode *table)
2227 {
2228         unsigned int accum = 0;
2229         uint32_t elen;
2230         struct kernel_lb_addr eloc;
2231         int8_t etype;
2232         struct extent_position epos;
2233
2234         lock_kernel();
2235
2236         epos.block = UDF_I(table)->i_location;
2237         epos.offset = sizeof(struct unallocSpaceEntry);
2238         epos.bh = NULL;
2239
2240         while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2241                 accum += (elen >> table->i_sb->s_blocksize_bits);
2242
2243         brelse(epos.bh);
2244
2245         unlock_kernel();
2246
2247         return accum;
2248 }
2249
2250 static unsigned int udf_count_free(struct super_block *sb)
2251 {
2252         unsigned int accum = 0;
2253         struct udf_sb_info *sbi;
2254         struct udf_part_map *map;
2255
2256         sbi = UDF_SB(sb);
2257         if (sbi->s_lvid_bh) {
2258                 struct logicalVolIntegrityDesc *lvid =
2259                         (struct logicalVolIntegrityDesc *)
2260                         sbi->s_lvid_bh->b_data;
2261                 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
2262                         accum = le32_to_cpu(
2263                                         lvid->freeSpaceTable[sbi->s_partition]);
2264                         if (accum == 0xFFFFFFFF)
2265                                 accum = 0;
2266                 }
2267         }
2268
2269         if (accum)
2270                 return accum;
2271
2272         map = &sbi->s_partmaps[sbi->s_partition];
2273         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2274                 accum += udf_count_free_bitmap(sb,
2275                                                map->s_uspace.s_bitmap);
2276         }
2277         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
2278                 accum += udf_count_free_bitmap(sb,
2279                                                map->s_fspace.s_bitmap);
2280         }
2281         if (accum)
2282                 return accum;
2283
2284         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2285                 accum += udf_count_free_table(sb,
2286                                               map->s_uspace.s_table);
2287         }
2288         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
2289                 accum += udf_count_free_table(sb,
2290                                               map->s_fspace.s_table);
2291         }
2292
2293         return accum;
2294 }