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 struct dentry *udf_mount(struct file_system_type *fs_type,
 111                       int flags, const char *dev_name, void *data)
 112 {
 113         return mount_bdev(fs_type, flags, dev_name, data, udf_fill_super);
 114 }
 115
 116 static struct file_system_type udf_fstype = {
 117         .owner          = THIS_MODULE,
 118         .name           = "udf",
 119         .mount          = udf_mount,
 120         .kill_sb        = kill_block_super,
 121         .fs_flags       = FS_REQUIRES_DEV,
 122 };
 123
 124 static struct kmem_cache *udf_inode_cachep;
 125
 126 static struct inode *udf_alloc_inode(struct super_block *sb)
 127 {
 128         struct udf_inode_info *ei;
 129         ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
 130         if (!ei)
 131                 return NULL;
 132
 133         ei->i_unique = 0;
 134         ei->i_lenExtents = 0;
 135         ei->i_next_alloc_block = 0;
 136         ei->i_next_alloc_goal = 0;
 137         ei->i_strat4096 = 0;
 138
 139         return &ei->vfs_inode;
 140 }
 141
 142 static void udf_destroy_inode(struct inode *inode)
 143 {
 144         kmem_cache_free(udf_inode_cachep, UDF_I(inode));
 145 }
 146
 147 static void init_once(void *foo)
 148 {
 149         struct udf_inode_info *ei = (struct udf_inode_info *)foo;
 150
 151         ei->i_ext.i_data = NULL;
 152         inode_init_once(&ei->vfs_inode);
 153 }
 154
 155 static int init_inodecache(void)
 156 {
 157         udf_inode_cachep = kmem_cache_create("udf_inode_cache",
 158                                              sizeof(struct udf_inode_info),
 159                                              0, (SLAB_RECLAIM_ACCOUNT |
 160                                                  SLAB_MEM_SPREAD),
 161                                              init_once);
 162         if (!udf_inode_cachep)
 163                 return -ENOMEM;
 164         return 0;
 165 }
 166
 167 static void destroy_inodecache(void)
 168 {
 169         kmem_cache_destroy(udf_inode_cachep);
 170 }
 171
 172 /* Superblock operations */
 173 static const struct super_operations udf_sb_ops = {
 174         .alloc_inode    = udf_alloc_inode,
 175         .destroy_inode  = udf_destroy_inode,
 176         .write_inode    = udf_write_inode,
 177         .evict_inode    = udf_evict_inode,
 178         .put_super      = udf_put_super,
 179         .sync_fs        = udf_sync_fs,
 180         .statfs         = udf_statfs,
 181         .remount_fs     = udf_remount_fs,
 182         .show_options   = udf_show_options,
 183 };
 184
 185 struct udf_options {
 186         unsigned char novrs;
 187         unsigned int blocksize;
 188         unsigned int session;
 189         unsigned int lastblock;
 190         unsigned int anchor;
 191         unsigned int volume;
 192         unsigned short partition;
 193         unsigned int fileset;
 194         unsigned int rootdir;
 195         unsigned int flags;
 196         mode_t umask;
 197         gid_t gid;
 198         uid_t uid;
 199         mode_t fmode;
 200         mode_t dmode;
 201         struct nls_table *nls_map;
 202 };
 203
 204 static int __init init_udf_fs(void)
 205 {
 206         int err;
 207
 208         err = init_inodecache();
 209         if (err)
 210                 goto out1;
 211         err = register_filesystem(&udf_fstype);
 212         if (err)
 213                 goto out;
 214
 215         return 0;
 216
 217 out:
 218         destroy_inodecache();
 219
 220 out1:
 221         return err;
 222 }
 223
 224 static void __exit exit_udf_fs(void)
 225 {
 226         unregister_filesystem(&udf_fstype);
 227         destroy_inodecache();
 228 }
 229
 230 module_init(init_udf_fs)
 231 module_exit(exit_udf_fs)
 232
 233 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
 234 {
 235         struct udf_sb_info *sbi = UDF_SB(sb);
 236
 237         sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map),
 238                                   GFP_KERNEL);
 239         if (!sbi->s_partmaps) {
 240                 udf_error(sb, __func__,
 241                           "Unable to allocate space for %d partition maps",
 242                           count);
 243                 sbi->s_partitions = 0;
 244                 return -ENOMEM;
 245         }
 246
 247         sbi->s_partitions = count;
 248         return 0;
 249 }
 250
 251 static int udf_show_options(struct seq_file *seq, struct vfsmount *mnt)
 252 {
 253         struct super_block *sb = mnt->mnt_sb;
 254         struct udf_sb_info *sbi = UDF_SB(sb);
 255
 256         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
 257                 seq_puts(seq, ",nostrict");
 258         if (UDF_QUERY_FLAG(sb, UDF_FLAG_BLOCKSIZE_SET))
 259                 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
 260         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
 261                 seq_puts(seq, ",unhide");
 262         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
 263                 seq_puts(seq, ",undelete");
 264         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
 265                 seq_puts(seq, ",noadinicb");
 266         if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
 267                 seq_puts(seq, ",shortad");
 268         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
 269                 seq_puts(seq, ",uid=forget");
 270         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_IGNORE))
 271                 seq_puts(seq, ",uid=ignore");
 272         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
 273                 seq_puts(seq, ",gid=forget");
 274         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE))
 275                 seq_puts(seq, ",gid=ignore");
 276         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
 277                 seq_printf(seq, ",uid=%u", sbi->s_uid);
 278         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
 279                 seq_printf(seq, ",gid=%u", sbi->s_gid);
 280         if (sbi->s_umask != 0)
 281                 seq_printf(seq, ",umask=%o", sbi->s_umask);
 282         if (sbi->s_fmode != UDF_INVALID_MODE)
 283                 seq_printf(seq, ",mode=%o", sbi->s_fmode);
 284         if (sbi->s_dmode != UDF_INVALID_MODE)
 285                 seq_printf(seq, ",dmode=%o", sbi->s_dmode);
 286         if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
 287                 seq_printf(seq, ",session=%u", sbi->s_session);
 288         if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
 289                 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
 290         if (sbi->s_anchor != 0)
 291                 seq_printf(seq, ",anchor=%u", sbi->s_anchor);
 292         /*
 293          * volume, partition, fileset and rootdir seem to be ignored
 294          * currently
 295          */
 296         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
 297                 seq_puts(seq, ",utf8");
 298         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
 299                 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
 300
 301         return 0;
 302 }
 303
 304 /*
 305  * udf_parse_options
 306  *
 307  * PURPOSE
 308  *      Parse mount options.
 309  *
 310  * DESCRIPTION
 311  *      The following mount options are supported:
 312  *
 313  *      gid=            Set the default group.
 314  *      umask=          Set the default umask.
 315  *      mode=           Set the default file permissions.
 316  *      dmode=          Set the default directory permissions.
 317  *      uid=            Set the default user.
 318  *      bs=             Set the block size.
 319  *      unhide          Show otherwise hidden files.
 320  *      undelete        Show deleted files in lists.
 321  *      adinicb         Embed data in the inode (default)
 322  *      noadinicb       Don't embed data in the inode
 323  *      shortad         Use short ad's
 324  *      longad          Use long ad's (default)
 325  *      nostrict        Unset strict conformance
 326  *      iocharset=      Set the NLS character set
 327  *
 328  *      The remaining are for debugging and disaster recovery:
 329  *
 330  *      novrs           Skip volume sequence recognition
 331  *
 332  *      The following expect a offset from 0.
 333  *
 334  *      session=        Set the CDROM session (default= last session)
 335  *      anchor=         Override standard anchor location. (default= 256)
 336  *      volume=         Override the VolumeDesc location. (unused)
 337  *      partition=      Override the PartitionDesc location. (unused)
 338  *      lastblock=      Set the last block of the filesystem/
 339  *
 340  *      The following expect a offset from the partition root.
 341  *
 342  *      fileset=        Override the fileset block location. (unused)
 343  *      rootdir=        Override the root directory location. (unused)
 344  *              WARNING: overriding the rootdir to a non-directory may
 345  *              yield highly unpredictable results.
 346  *
 347  * PRE-CONDITIONS
 348  *      options         Pointer to mount options string.
 349  *      uopts           Pointer to mount options variable.
 350  *
 351  * POST-CONDITIONS
 352  *      <return>        1       Mount options parsed okay.
 353  *      <return>        0       Error parsing mount options.
 354  *
 355  * HISTORY
 356  *      July 1, 1997 - Andrew E. Mileski
 357  *      Written, tested, and released.
 358  */
 359
 360 enum {
 361         Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
 362         Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
 363         Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
 364         Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
 365         Opt_rootdir, Opt_utf8, Opt_iocharset,
 366         Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore,
 367         Opt_fmode, Opt_dmode
 368 };
 369
 370 static const match_table_t tokens = {
 371         {Opt_novrs,     "novrs"},
 372         {Opt_nostrict,  "nostrict"},
 373         {Opt_bs,        "bs=%u"},
 374         {Opt_unhide,    "unhide"},
 375         {Opt_undelete,  "undelete"},
 376         {Opt_noadinicb, "noadinicb"},
 377         {Opt_adinicb,   "adinicb"},
 378         {Opt_shortad,   "shortad"},
 379         {Opt_longad,    "longad"},
 380         {Opt_uforget,   "uid=forget"},
 381         {Opt_uignore,   "uid=ignore"},
 382         {Opt_gforget,   "gid=forget"},
 383         {Opt_gignore,   "gid=ignore"},
 384         {Opt_gid,       "gid=%u"},
 385         {Opt_uid,       "uid=%u"},
 386         {Opt_umask,     "umask=%o"},
 387         {Opt_session,   "session=%u"},
 388         {Opt_lastblock, "lastblock=%u"},
 389         {Opt_anchor,    "anchor=%u"},
 390         {Opt_volume,    "volume=%u"},
 391         {Opt_partition, "partition=%u"},
 392         {Opt_fileset,   "fileset=%u"},
 393         {Opt_rootdir,   "rootdir=%u"},
 394         {Opt_utf8,      "utf8"},
 395         {Opt_iocharset, "iocharset=%s"},
 396         {Opt_fmode,     "mode=%o"},
 397         {Opt_dmode,     "dmode=%o"},
 398         {Opt_err,       NULL}
 399 };
 400
 401 static int udf_parse_options(char *options, struct udf_options *uopt,
 402                              bool remount)
 403 {
 404         char *p;
 405         int option;
 406
 407         uopt->novrs = 0;
 408         uopt->partition = 0xFFFF;
 409         uopt->session = 0xFFFFFFFF;
 410         uopt->lastblock = 0;
 411         uopt->anchor = 0;
 412         uopt->volume = 0xFFFFFFFF;
 413         uopt->rootdir = 0xFFFFFFFF;
 414         uopt->fileset = 0xFFFFFFFF;
 415         uopt->nls_map = NULL;
 416
 417         if (!options)
 418                 return 1;
 419
 420         while ((p = strsep(&options, ",")) != NULL) {
 421                 substring_t args[MAX_OPT_ARGS];
 422                 int token;
 423                 if (!*p)
 424                         continue;
 425
 426                 token = match_token(p, tokens, args);
 427                 switch (token) {
 428                 case Opt_novrs:
 429                         uopt->novrs = 1;
 430                         break;
 431                 case Opt_bs:
 432                         if (match_int(&args[0], &option))
 433                                 return 0;
 434                         uopt->blocksize = option;
 435                         uopt->flags |= (1 << UDF_FLAG_BLOCKSIZE_SET);
 436                         break;
 437                 case Opt_unhide:
 438                         uopt->flags |= (1 << UDF_FLAG_UNHIDE);
 439                         break;
 440                 case Opt_undelete:
 441                         uopt->flags |= (1 << UDF_FLAG_UNDELETE);
 442                         break;
 443                 case Opt_noadinicb:
 444                         uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
 445                         break;
 446                 case Opt_adinicb:
 447                         uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
 448                         break;
 449                 case Opt_shortad:
 450                         uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
 451                         break;
 452                 case Opt_longad:
 453                         uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
 454                         break;
 455                 case Opt_gid:
 456                         if (match_int(args, &option))
 457                                 return 0;
 458                         uopt->gid = option;
 459                         uopt->flags |= (1 << UDF_FLAG_GID_SET);
 460                         break;
 461                 case Opt_uid:
 462                         if (match_int(args, &option))
 463                                 return 0;
 464                         uopt->uid = option;
 465                         uopt->flags |= (1 << UDF_FLAG_UID_SET);
 466                         break;
 467                 case Opt_umask:
 468                         if (match_octal(args, &option))
 469                                 return 0;
 470                         uopt->umask = option;
 471                         break;
 472                 case Opt_nostrict:
 473                         uopt->flags &= ~(1 << UDF_FLAG_STRICT);
 474                         break;
 475                 case Opt_session:
 476                         if (match_int(args, &option))
 477                                 return 0;
 478                         uopt->session = option;
 479                         if (!remount)
 480                                 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
 481                         break;
 482                 case Opt_lastblock:
 483                         if (match_int(args, &option))
 484                                 return 0;
 485                         uopt->lastblock = option;
 486                         if (!remount)
 487                                 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
 488                         break;
 489                 case Opt_anchor:
 490                         if (match_int(args, &option))
 491                                 return 0;
 492                         uopt->anchor = option;
 493                         break;
 494                 case Opt_volume:
 495                         if (match_int(args, &option))
 496                                 return 0;
 497                         uopt->volume = option;
 498                         break;
 499                 case Opt_partition:
 500                         if (match_int(args, &option))
 501                                 return 0;
 502                         uopt->partition = option;
 503                         break;
 504                 case Opt_fileset:
 505                         if (match_int(args, &option))
 506                                 return 0;
 507                         uopt->fileset = option;
 508                         break;
 509                 case Opt_rootdir:
 510                         if (match_int(args, &option))
 511                                 return 0;
 512                         uopt->rootdir = option;
 513                         break;
 514                 case Opt_utf8:
 515                         uopt->flags |= (1 << UDF_FLAG_UTF8);
 516                         break;
 517 #ifdef CONFIG_UDF_NLS
 518                 case Opt_iocharset:
 519                         uopt->nls_map = load_nls(args[0].from);
 520                         uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
 521                         break;
 522 #endif
 523                 case Opt_uignore:
 524                         uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
 525                         break;
 526                 case Opt_uforget:
 527                         uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
 528                         break;
 529                 case Opt_gignore:
 530                         uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
 531                         break;
 532                 case Opt_gforget:
 533                         uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
 534                         break;
 535                 case Opt_fmode:
 536                         if (match_octal(args, &option))
 537                                 return 0;
 538                         uopt->fmode = option & 0777;
 539                         break;
 540                 case Opt_dmode:
 541                         if (match_octal(args, &option))
 542                                 return 0;
 543                         uopt->dmode = option & 0777;
 544                         break;
 545                 default:
 546                         printk(KERN_ERR "udf: bad mount option \"%s\" "
 547                                "or missing value\n", p);
 548                         return 0;
 549                 }
 550         }
 551         return 1;
 552 }
 553
 554 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
 555 {
 556         struct udf_options uopt;
 557         struct udf_sb_info *sbi = UDF_SB(sb);
 558         int error = 0;
 559
 560         uopt.flags = sbi->s_flags;
 561         uopt.uid   = sbi->s_uid;
 562         uopt.gid   = sbi->s_gid;
 563         uopt.umask = sbi->s_umask;
 564         uopt.fmode = sbi->s_fmode;
 565         uopt.dmode = sbi->s_dmode;
 566
 567         if (!udf_parse_options(options, &uopt, true))
 568                 return -EINVAL;
 569
 570         lock_kernel();
 571         sbi->s_flags = uopt.flags;
 572         sbi->s_uid   = uopt.uid;
 573         sbi->s_gid   = uopt.gid;
 574         sbi->s_umask = uopt.umask;
 575         sbi->s_fmode = uopt.fmode;
 576         sbi->s_dmode = uopt.dmode;
 577
 578         if (sbi->s_lvid_bh) {
 579                 int write_rev = le16_to_cpu(udf_sb_lvidiu(sbi)->minUDFWriteRev);
 580                 if (write_rev > UDF_MAX_WRITE_VERSION)
 581                         *flags |= MS_RDONLY;
 582         }
 583
 584         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 585                 goto out_unlock;
 586
 587         if (*flags & MS_RDONLY)
 588                 udf_close_lvid(sb);
 589         else
 590                 udf_open_lvid(sb);
 591
 592 out_unlock:
 593         unlock_kernel();
 594         return error;
 595 }
 596
 597 /* Check Volume Structure Descriptors (ECMA 167 2/9.1) */
 598 /* We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
 599 static loff_t udf_check_vsd(struct super_block *sb)
 600 {
 601         struct volStructDesc *vsd = NULL;
 602         loff_t sector = 32768;
 603         int sectorsize;
 604         struct buffer_head *bh = NULL;
 605         int nsr02 = 0;
 606         int nsr03 = 0;
 607         struct udf_sb_info *sbi;
 608
 609         sbi = UDF_SB(sb);
 610         if (sb->s_blocksize < sizeof(struct volStructDesc))
 611                 sectorsize = sizeof(struct volStructDesc);
 612         else
 613                 sectorsize = sb->s_blocksize;
 614
 615         sector += (sbi->s_session << sb->s_blocksize_bits);
 616
 617         udf_debug("Starting at sector %u (%ld byte sectors)\n",
 618                   (unsigned int)(sector >> sb->s_blocksize_bits),
 619                   sb->s_blocksize);
 620         /* Process the sequence (if applicable) */
 621         for (; !nsr02 && !nsr03; sector += sectorsize) {
 622                 /* Read a block */
 623                 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
 624                 if (!bh)
 625                         break;
 626
 627                 /* Look for ISO  descriptors */
 628                 vsd = (struct volStructDesc *)(bh->b_data +
 629                                               (sector & (sb->s_blocksize - 1)));
 630
 631                 if (vsd->stdIdent[0] == 0) {
 632                         brelse(bh);
 633                         break;
 634                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
 635                                     VSD_STD_ID_LEN)) {
 636                         switch (vsd->structType) {
 637                         case 0:
 638                                 udf_debug("ISO9660 Boot Record found\n");
 639                                 break;
 640                         case 1:
 641                                 udf_debug("ISO9660 Primary Volume Descriptor "
 642                                           "found\n");
 643                                 break;
 644                         case 2:
 645                                 udf_debug("ISO9660 Supplementary Volume "
 646                                           "Descriptor found\n");
 647                                 break;
 648                         case 3:
 649                                 udf_debug("ISO9660 Volume Partition Descriptor "
 650                                           "found\n");
 651                                 break;
 652                         case 255:
 653                                 udf_debug("ISO9660 Volume Descriptor Set "
 654                                           "Terminator found\n");
 655                                 break;
 656                         default:
 657                                 udf_debug("ISO9660 VRS (%u) found\n",
 658                                           vsd->structType);
 659                                 break;
 660                         }
 661                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
 662                                     VSD_STD_ID_LEN))
 663                         ; /* nothing */
 664                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
 665                                     VSD_STD_ID_LEN)) {
 666                         brelse(bh);
 667                         break;
 668                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
 669                                     VSD_STD_ID_LEN))
 670                         nsr02 = sector;
 671                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
 672                                     VSD_STD_ID_LEN))
 673                         nsr03 = sector;
 674                 brelse(bh);
 675         }
 676
 677         if (nsr03)
 678                 return nsr03;
 679         else if (nsr02)
 680                 return nsr02;
 681         else if (sector - (sbi->s_session << sb->s_blocksize_bits) == 32768)
 682                 return -1;
 683         else
 684                 return 0;
 685 }
 686
 687 static int udf_find_fileset(struct super_block *sb,
 688                             struct kernel_lb_addr *fileset,
 689                             struct kernel_lb_addr *root)
 690 {
 691         struct buffer_head *bh = NULL;
 692         long lastblock;
 693         uint16_t ident;
 694         struct udf_sb_info *sbi;
 695
 696         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
 697             fileset->partitionReferenceNum != 0xFFFF) {
 698                 bh = udf_read_ptagged(sb, fileset, 0, &ident);
 699
 700                 if (!bh) {
 701                         return 1;
 702                 } else if (ident != TAG_IDENT_FSD) {
 703                         brelse(bh);
 704                         return 1;
 705                 }
 706
 707         }
 708
 709         sbi = UDF_SB(sb);
 710         if (!bh) {
 711                 /* Search backwards through the partitions */
 712                 struct kernel_lb_addr newfileset;
 713
 714 /* --> cvg: FIXME - is it reasonable? */
 715                 return 1;
 716
 717                 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
 718                      (newfileset.partitionReferenceNum != 0xFFFF &&
 719                       fileset->logicalBlockNum == 0xFFFFFFFF &&
 720                       fileset->partitionReferenceNum == 0xFFFF);
 721                      newfileset.partitionReferenceNum--) {
 722                         lastblock = sbi->s_partmaps
 723                                         [newfileset.partitionReferenceNum]
 724                                                 .s_partition_len;
 725                         newfileset.logicalBlockNum = 0;
 726
 727                         do {
 728                                 bh = udf_read_ptagged(sb, &newfileset, 0,
 729                                                       &ident);
 730                                 if (!bh) {
 731                                         newfileset.logicalBlockNum++;
 732                                         continue;
 733                                 }
 734
 735                                 switch (ident) {
 736                                 case TAG_IDENT_SBD:
 737                                 {
 738                                         struct spaceBitmapDesc *sp;
 739                                         sp = (struct spaceBitmapDesc *)
 740                                                                 bh->b_data;
 741                                         newfileset.logicalBlockNum += 1 +
 742                                                 ((le32_to_cpu(sp->numOfBytes) +
 743                                                   sizeof(struct spaceBitmapDesc)
 744                                                   - 1) >> sb->s_blocksize_bits);
 745                                         brelse(bh);
 746                                         break;
 747                                 }
 748                                 case TAG_IDENT_FSD:
 749                                         *fileset = newfileset;
 750                                         break;
 751                                 default:
 752                                         newfileset.logicalBlockNum++;
 753                                         brelse(bh);
 754                                         bh = NULL;
 755                                         break;
 756                                 }
 757                         } while (newfileset.logicalBlockNum < lastblock &&
 758                                  fileset->logicalBlockNum == 0xFFFFFFFF &&
 759                                  fileset->partitionReferenceNum == 0xFFFF);
 760                 }
 761         }
 762
 763         if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
 764              fileset->partitionReferenceNum != 0xFFFF) && bh) {
 765                 udf_debug("Fileset at block=%d, partition=%d\n",
 766                           fileset->logicalBlockNum,
 767                           fileset->partitionReferenceNum);
 768
 769                 sbi->s_partition = fileset->partitionReferenceNum;
 770                 udf_load_fileset(sb, bh, root);
 771                 brelse(bh);
 772                 return 0;
 773         }
 774         return 1;
 775 }
 776
 777 static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
 778 {
 779         struct primaryVolDesc *pvoldesc;
 780         struct ustr *instr, *outstr;
 781         struct buffer_head *bh;
 782         uint16_t ident;
 783         int ret = 1;
 784
 785         instr = kmalloc(sizeof(struct ustr), GFP_NOFS);
 786         if (!instr)
 787                 return 1;
 788
 789         outstr = kmalloc(sizeof(struct ustr), GFP_NOFS);
 790         if (!outstr)
 791                 goto out1;
 792
 793         bh = udf_read_tagged(sb, block, block, &ident);
 794         if (!bh)
 795                 goto out2;
 796
 797         BUG_ON(ident != TAG_IDENT_PVD);
 798
 799         pvoldesc = (struct primaryVolDesc *)bh->b_data;
 800
 801         if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
 802                               pvoldesc->recordingDateAndTime)) {
 803 #ifdef UDFFS_DEBUG
 804                 struct timestamp *ts = &pvoldesc->recordingDateAndTime;
 805                 udf_debug("recording time %04u/%02u/%02u"
 806                           " %02u:%02u (%x)\n",
 807                           le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
 808                           ts->minute, le16_to_cpu(ts->typeAndTimezone));
 809 #endif
 810         }
 811
 812         if (!udf_build_ustr(instr, pvoldesc->volIdent, 32))
 813                 if (udf_CS0toUTF8(outstr, instr)) {
 814                         strncpy(UDF_SB(sb)->s_volume_ident, outstr->u_name,
 815                                 outstr->u_len > 31 ? 31 : outstr->u_len);
 816                         udf_debug("volIdent[] = '%s'\n",
 817                                         UDF_SB(sb)->s_volume_ident);
 818                 }
 819
 820         if (!udf_build_ustr(instr, pvoldesc->volSetIdent, 128))
 821                 if (udf_CS0toUTF8(outstr, instr))
 822                         udf_debug("volSetIdent[] = '%s'\n", outstr->u_name);
 823
 824         brelse(bh);
 825         ret = 0;
 826 out2:
 827         kfree(outstr);
 828 out1:
 829         kfree(instr);
 830         return ret;
 831 }
 832
 833 static int udf_load_metadata_files(struct super_block *sb, int partition)
 834 {
 835         struct udf_sb_info *sbi = UDF_SB(sb);
 836         struct udf_part_map *map;
 837         struct udf_meta_data *mdata;
 838         struct kernel_lb_addr addr;
 839         int fe_error = 0;
 840
 841         map = &sbi->s_partmaps[partition];
 842         mdata = &map->s_type_specific.s_metadata;
 843
 844         /* metadata address */
 845         addr.logicalBlockNum =  mdata->s_meta_file_loc;
 846         addr.partitionReferenceNum = map->s_partition_num;
 847
 848         udf_debug("Metadata file location: block = %d part = %d\n",
 849                           addr.logicalBlockNum, addr.partitionReferenceNum);
 850
 851         mdata->s_metadata_fe = udf_iget(sb, &addr);
 852
 853         if (mdata->s_metadata_fe == NULL) {
 854                 udf_warning(sb, __func__, "metadata inode efe not found, "
 855                                 "will try mirror inode.");
 856                 fe_error = 1;
 857         } else if (UDF_I(mdata->s_metadata_fe)->i_alloc_type !=
 858                  ICBTAG_FLAG_AD_SHORT) {
 859                 udf_warning(sb, __func__, "metadata inode efe does not have "
 860                         "short allocation descriptors!");
 861                 fe_error = 1;
 862                 iput(mdata->s_metadata_fe);
 863                 mdata->s_metadata_fe = NULL;
 864         }
 865
 866         /* mirror file entry */
 867         addr.logicalBlockNum = mdata->s_mirror_file_loc;
 868         addr.partitionReferenceNum = map->s_partition_num;
 869
 870         udf_debug("Mirror metadata file location: block = %d part = %d\n",
 871                           addr.logicalBlockNum, addr.partitionReferenceNum);
 872
 873         mdata->s_mirror_fe = udf_iget(sb, &addr);
 874
 875         if (mdata->s_mirror_fe == NULL) {
 876                 if (fe_error) {
 877                         udf_error(sb, __func__, "mirror inode efe not found "
 878                         "and metadata inode is missing too, exiting...");
 879                         goto error_exit;
 880                 } else
 881                         udf_warning(sb, __func__, "mirror inode efe not found,"
 882                                         " but metadata inode is OK");
 883         } else if (UDF_I(mdata->s_mirror_fe)->i_alloc_type !=
 884                  ICBTAG_FLAG_AD_SHORT) {
 885                 udf_warning(sb, __func__, "mirror inode efe does not have "
 886                         "short allocation descriptors!");
 887                 iput(mdata->s_mirror_fe);
 888                 mdata->s_mirror_fe = NULL;
 889                 if (fe_error)
 890                         goto error_exit;
 891         }
 892
 893         /*
 894          * bitmap file entry
 895          * Note:
 896          * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
 897         */
 898         if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
 899                 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
 900                 addr.partitionReferenceNum = map->s_partition_num;
 901
 902                 udf_debug("Bitmap file location: block = %d part = %d\n",
 903                         addr.logicalBlockNum, addr.partitionReferenceNum);
 904
 905                 mdata->s_bitmap_fe = udf_iget(sb, &addr);
 906
 907                 if (mdata->s_bitmap_fe == NULL) {
 908                         if (sb->s_flags & MS_RDONLY)
 909                                 udf_warning(sb, __func__, "bitmap inode efe "
 910                                         "not found but it's ok since the disc"
 911                                         " is mounted read-only");
 912                         else {
 913                                 udf_error(sb, __func__, "bitmap inode efe not "
 914                                         "found and attempted read-write mount");
 915                                 goto error_exit;
 916                         }
 917                 }
 918         }
 919
 920         udf_debug("udf_load_metadata_files Ok\n");
 921
 922         return 0;
 923
 924 error_exit:
 925         return 1;
 926 }
 927
 928 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
 929                              struct kernel_lb_addr *root)
 930 {
 931         struct fileSetDesc *fset;
 932
 933         fset = (struct fileSetDesc *)bh->b_data;
 934
 935         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
 936
 937         UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
 938
 939         udf_debug("Rootdir at block=%d, partition=%d\n",
 940                   root->logicalBlockNum, root->partitionReferenceNum);
 941 }
 942
 943 int udf_compute_nr_groups(struct super_block *sb, u32 partition)
 944 {
 945         struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
 946         return DIV_ROUND_UP(map->s_partition_len +
 947                             (sizeof(struct spaceBitmapDesc) << 3),
 948                             sb->s_blocksize * 8);
 949 }
 950
 951 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
 952 {
 953         struct udf_bitmap *bitmap;
 954         int nr_groups;
 955         int size;
 956
 957         nr_groups = udf_compute_nr_groups(sb, index);
 958         size = sizeof(struct udf_bitmap) +
 959                 (sizeof(struct buffer_head *) * nr_groups);
 960
 961         if (size <= PAGE_SIZE)
 962                 bitmap = kmalloc(size, GFP_KERNEL);
 963         else
 964                 bitmap = vmalloc(size); /* TODO: get rid of vmalloc */
 965
 966         if (bitmap == NULL) {
 967                 udf_error(sb, __func__,
 968                           "Unable to allocate space for bitmap "
 969                           "and %d buffer_head pointers", nr_groups);
 970                 return NULL;
 971         }
 972
 973         memset(bitmap, 0x00, size);
 974         bitmap->s_block_bitmap = (struct buffer_head **)(bitmap + 1);
 975         bitmap->s_nr_groups = nr_groups;
 976         return bitmap;
 977 }
 978
 979 static int udf_fill_partdesc_info(struct super_block *sb,
 980                 struct partitionDesc *p, int p_index)
 981 {
 982         struct udf_part_map *map;
 983         struct udf_sb_info *sbi = UDF_SB(sb);
 984         struct partitionHeaderDesc *phd;
 985
 986         map = &sbi->s_partmaps[p_index];
 987
 988         map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
 989         map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
 990
 991         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
 992                 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
 993         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
 994                 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
 995         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
 996                 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
 997         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
 998                 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
 999
1000         udf_debug("Partition (%d type %x) starts at physical %d, "
1001                   "block length %d\n", p_index,
1002                   map->s_partition_type, map->s_partition_root,
1003                   map->s_partition_len);
1004
1005         if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1006             strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
1007                 return 0;
1008
1009         phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1010         if (phd->unallocSpaceTable.extLength) {
1011                 struct kernel_lb_addr loc = {
1012                         .logicalBlockNum = le32_to_cpu(
1013                                 phd->unallocSpaceTable.extPosition),
1014                         .partitionReferenceNum = p_index,
1015                 };
1016
1017                 map->s_uspace.s_table = udf_iget(sb, &loc);
1018                 if (!map->s_uspace.s_table) {
1019                         udf_debug("cannot load unallocSpaceTable (part %d)\n",
1020                                         p_index);
1021                         return 1;
1022                 }
1023                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1024                 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
1025                                 p_index, map->s_uspace.s_table->i_ino);
1026         }
1027
1028         if (phd->unallocSpaceBitmap.extLength) {
1029                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1030                 if (!bitmap)
1031                         return 1;
1032                 map->s_uspace.s_bitmap = bitmap;
1033                 bitmap->s_extLength = le32_to_cpu(
1034                                 phd->unallocSpaceBitmap.extLength);
1035                 bitmap->s_extPosition = le32_to_cpu(
1036                                 phd->unallocSpaceBitmap.extPosition);
1037                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1038                 udf_debug("unallocSpaceBitmap (part %d) @ %d\n", p_index,
1039                                                 bitmap->s_extPosition);
1040         }
1041
1042         if (phd->partitionIntegrityTable.extLength)
1043                 udf_debug("partitionIntegrityTable (part %d)\n", p_index);
1044
1045         if (phd->freedSpaceTable.extLength) {
1046                 struct kernel_lb_addr loc = {
1047                         .logicalBlockNum = le32_to_cpu(
1048                                 phd->freedSpaceTable.extPosition),
1049                         .partitionReferenceNum = p_index,
1050                 };
1051
1052                 map->s_fspace.s_table = udf_iget(sb, &loc);
1053                 if (!map->s_fspace.s_table) {
1054                         udf_debug("cannot load freedSpaceTable (part %d)\n",
1055                                 p_index);
1056                         return 1;
1057                 }
1058
1059                 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
1060                 udf_debug("freedSpaceTable (part %d) @ %ld\n",
1061                                 p_index, map->s_fspace.s_table->i_ino);
1062         }
1063
1064         if (phd->freedSpaceBitmap.extLength) {
1065                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1066                 if (!bitmap)
1067                         return 1;
1068                 map->s_fspace.s_bitmap = bitmap;
1069                 bitmap->s_extLength = le32_to_cpu(
1070                                 phd->freedSpaceBitmap.extLength);
1071                 bitmap->s_extPosition = le32_to_cpu(
1072                                 phd->freedSpaceBitmap.extPosition);
1073                 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1074                 udf_debug("freedSpaceBitmap (part %d) @ %d\n", p_index,
1075                                         bitmap->s_extPosition);
1076         }
1077         return 0;
1078 }
1079
1080 static void udf_find_vat_block(struct super_block *sb, int p_index,
1081                                int type1_index, sector_t start_block)
1082 {
1083         struct udf_sb_info *sbi = UDF_SB(sb);
1084         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1085         sector_t vat_block;
1086         struct kernel_lb_addr ino;
1087
1088         /*
1089          * VAT file entry is in the last recorded block. Some broken disks have
1090          * it a few blocks before so try a bit harder...
1091          */
1092         ino.partitionReferenceNum = type1_index;
1093         for (vat_block = start_block;
1094              vat_block >= map->s_partition_root &&
1095              vat_block >= start_block - 3 &&
1096              !sbi->s_vat_inode; vat_block--) {
1097                 ino.logicalBlockNum = vat_block - map->s_partition_root;
1098                 sbi->s_vat_inode = udf_iget(sb, &ino);
1099         }
1100 }
1101
1102 static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1103 {
1104         struct udf_sb_info *sbi = UDF_SB(sb);
1105         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1106         struct buffer_head *bh = NULL;
1107         struct udf_inode_info *vati;
1108         uint32_t pos;
1109         struct virtualAllocationTable20 *vat20;
1110         sector_t blocks = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
1111
1112         udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block);
1113         if (!sbi->s_vat_inode &&
1114             sbi->s_last_block != blocks - 1) {
1115                 printk(KERN_NOTICE "UDF-fs: Failed to read VAT inode from the"
1116                        " last recorded block (%lu), retrying with the last "
1117                        "block of the device (%lu).\n",
1118                        (unsigned long)sbi->s_last_block,
1119                        (unsigned long)blocks - 1);
1120                 udf_find_vat_block(sb, p_index, type1_index, blocks - 1);
1121         }
1122         if (!sbi->s_vat_inode)
1123                 return 1;
1124
1125         if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1126                 map->s_type_specific.s_virtual.s_start_offset = 0;
1127                 map->s_type_specific.s_virtual.s_num_entries =
1128                         (sbi->s_vat_inode->i_size - 36) >> 2;
1129         } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1130                 vati = UDF_I(sbi->s_vat_inode);
1131                 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1132                         pos = udf_block_map(sbi->s_vat_inode, 0);
1133                         bh = sb_bread(sb, pos);
1134                         if (!bh)
1135                                 return 1;
1136                         vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1137                 } else {
1138                         vat20 = (struct virtualAllocationTable20 *)
1139                                                         vati->i_ext.i_data;
1140                 }
1141
1142                 map->s_type_specific.s_virtual.s_start_offset =
1143                         le16_to_cpu(vat20->lengthHeader);
1144                 map->s_type_specific.s_virtual.s_num_entries =
1145                         (sbi->s_vat_inode->i_size -
1146                                 map->s_type_specific.s_virtual.
1147                                         s_start_offset) >> 2;
1148                 brelse(bh);
1149         }
1150         return 0;
1151 }
1152
1153 static int udf_load_partdesc(struct super_block *sb, sector_t block)
1154 {
1155         struct buffer_head *bh;
1156         struct partitionDesc *p;
1157         struct udf_part_map *map;
1158         struct udf_sb_info *sbi = UDF_SB(sb);
1159         int i, type1_idx;
1160         uint16_t partitionNumber;
1161         uint16_t ident;
1162         int ret = 0;
1163
1164         bh = udf_read_tagged(sb, block, block, &ident);
1165         if (!bh)
1166                 return 1;
1167         if (ident != TAG_IDENT_PD)
1168                 goto out_bh;
1169
1170         p = (struct partitionDesc *)bh->b_data;
1171         partitionNumber = le16_to_cpu(p->partitionNumber);
1172
1173         /* First scan for TYPE1, SPARABLE and METADATA partitions */
1174         for (i = 0; i < sbi->s_partitions; i++) {
1175                 map = &sbi->s_partmaps[i];
1176                 udf_debug("Searching map: (%d == %d)\n",
1177                           map->s_partition_num, partitionNumber);
1178                 if (map->s_partition_num == partitionNumber &&
1179                     (map->s_partition_type == UDF_TYPE1_MAP15 ||
1180                      map->s_partition_type == UDF_SPARABLE_MAP15))
1181                         break;
1182         }
1183
1184         if (i >= sbi->s_partitions) {
1185                 udf_debug("Partition (%d) not found in partition map\n",
1186                           partitionNumber);
1187                 goto out_bh;
1188         }
1189
1190         ret = udf_fill_partdesc_info(sb, p, i);
1191
1192         /*
1193          * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1194          * PHYSICAL partitions are already set up
1195          */
1196         type1_idx = i;
1197         for (i = 0; i < sbi->s_partitions; i++) {
1198                 map = &sbi->s_partmaps[i];
1199
1200                 if (map->s_partition_num == partitionNumber &&
1201                     (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1202                      map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1203                      map->s_partition_type == UDF_METADATA_MAP25))
1204                         break;
1205         }
1206
1207         if (i >= sbi->s_partitions)
1208                 goto out_bh;
1209
1210         ret = udf_fill_partdesc_info(sb, p, i);
1211         if (ret)
1212                 goto out_bh;
1213
1214         if (map->s_partition_type == UDF_METADATA_MAP25) {
1215                 ret = udf_load_metadata_files(sb, i);
1216                 if (ret) {
1217                         printk(KERN_ERR "UDF-fs: error loading MetaData "
1218                         "partition map %d\n", i);
1219                         goto out_bh;
1220                 }
1221         } else {
1222                 ret = udf_load_vat(sb, i, type1_idx);
1223                 if (ret)
1224                         goto out_bh;
1225                 /*
1226                  * Mark filesystem read-only if we have a partition with
1227                  * virtual map since we don't handle writing to it (we
1228                  * overwrite blocks instead of relocating them).
1229                  */
1230                 sb->s_flags |= MS_RDONLY;
1231                 printk(KERN_NOTICE "UDF-fs: Filesystem marked read-only "
1232                         "because writing to pseudooverwrite partition is "
1233                         "not implemented.\n");
1234         }
1235 out_bh:
1236         /* In case loading failed, we handle cleanup in udf_fill_super */
1237         brelse(bh);
1238         return ret;
1239 }
1240
1241 static int udf_load_logicalvol(struct super_block *sb, sector_t block,
1242                                struct kernel_lb_addr *fileset)
1243 {
1244         struct logicalVolDesc *lvd;
1245         int i, j, offset;
1246         uint8_t type;
1247         struct udf_sb_info *sbi = UDF_SB(sb);
1248         struct genericPartitionMap *gpm;
1249         uint16_t ident;
1250         struct buffer_head *bh;
1251         int ret = 0;
1252
1253         bh = udf_read_tagged(sb, block, block, &ident);
1254         if (!bh)
1255                 return 1;
1256         BUG_ON(ident != TAG_IDENT_LVD);
1257         lvd = (struct logicalVolDesc *)bh->b_data;
1258
1259         i = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1260         if (i != 0) {
1261                 ret = i;
1262                 goto out_bh;
1263         }
1264
1265         for (i = 0, offset = 0;
1266              i < sbi->s_partitions && offset < le32_to_cpu(lvd->mapTableLength);
1267              i++, offset += gpm->partitionMapLength) {
1268                 struct udf_part_map *map = &sbi->s_partmaps[i];
1269                 gpm = (struct genericPartitionMap *)
1270                                 &(lvd->partitionMaps[offset]);
1271                 type = gpm->partitionMapType;
1272                 if (type == 1) {
1273                         struct genericPartitionMap1 *gpm1 =
1274                                 (struct genericPartitionMap1 *)gpm;
1275                         map->s_partition_type = UDF_TYPE1_MAP15;
1276                         map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1277                         map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1278                         map->s_partition_func = NULL;
1279                 } else if (type == 2) {
1280                         struct udfPartitionMap2 *upm2 =
1281                                                 (struct udfPartitionMap2 *)gpm;
1282                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1283                                                 strlen(UDF_ID_VIRTUAL))) {
1284                                 u16 suf =
1285                                         le16_to_cpu(((__le16 *)upm2->partIdent.
1286                                                         identSuffix)[0]);
1287                                 if (suf < 0x0200) {
1288                                         map->s_partition_type =
1289                                                         UDF_VIRTUAL_MAP15;
1290                                         map->s_partition_func =
1291                                                         udf_get_pblock_virt15;
1292                                 } else {
1293                                         map->s_partition_type =
1294                                                         UDF_VIRTUAL_MAP20;
1295                                         map->s_partition_func =
1296                                                         udf_get_pblock_virt20;
1297                                 }
1298                         } else if (!strncmp(upm2->partIdent.ident,
1299                                                 UDF_ID_SPARABLE,
1300                                                 strlen(UDF_ID_SPARABLE))) {
1301                                 uint32_t loc;
1302                                 struct sparingTable *st;
1303                                 struct sparablePartitionMap *spm =
1304                                         (struct sparablePartitionMap *)gpm;
1305
1306                                 map->s_partition_type = UDF_SPARABLE_MAP15;
1307                                 map->s_type_specific.s_sparing.s_packet_len =
1308                                                 le16_to_cpu(spm->packetLength);
1309                                 for (j = 0; j < spm->numSparingTables; j++) {
1310                                         struct buffer_head *bh2;
1311
1312                                         loc = le32_to_cpu(
1313                                                 spm->locSparingTable[j]);
1314                                         bh2 = udf_read_tagged(sb, loc, loc,
1315                                                              &ident);
1316                                         map->s_type_specific.s_sparing.
1317                                                         s_spar_map[j] = bh2;
1318
1319                                         if (bh2 == NULL)
1320                                                 continue;
1321
1322                                         st = (struct sparingTable *)bh2->b_data;
1323                                         if (ident != 0 || strncmp(
1324                                                 st->sparingIdent.ident,
1325                                                 UDF_ID_SPARING,
1326                                                 strlen(UDF_ID_SPARING))) {
1327                                                 brelse(bh2);
1328                                                 map->s_type_specific.s_sparing.
1329                                                         s_spar_map[j] = NULL;
1330                                         }
1331                                 }
1332                                 map->s_partition_func = udf_get_pblock_spar15;
1333                         } else if (!strncmp(upm2->partIdent.ident,
1334                                                 UDF_ID_METADATA,
1335                                                 strlen(UDF_ID_METADATA))) {
1336                                 struct udf_meta_data *mdata =
1337                                         &map->s_type_specific.s_metadata;
1338                                 struct metadataPartitionMap *mdm =
1339                                                 (struct metadataPartitionMap *)
1340                                                 &(lvd->partitionMaps[offset]);
1341                                 udf_debug("Parsing Logical vol part %d "
1342                                         "type %d  id=%s\n", i, type,
1343                                         UDF_ID_METADATA);
1344
1345                                 map->s_partition_type = UDF_METADATA_MAP25;
1346                                 map->s_partition_func = udf_get_pblock_meta25;
1347
1348                                 mdata->s_meta_file_loc   =
1349                                         le32_to_cpu(mdm->metadataFileLoc);
1350                                 mdata->s_mirror_file_loc =
1351                                         le32_to_cpu(mdm->metadataMirrorFileLoc);
1352                                 mdata->s_bitmap_file_loc =
1353                                         le32_to_cpu(mdm->metadataBitmapFileLoc);
1354                                 mdata->s_alloc_unit_size =
1355                                         le32_to_cpu(mdm->allocUnitSize);
1356                                 mdata->s_align_unit_size =
1357                                         le16_to_cpu(mdm->alignUnitSize);
1358                                 mdata->s_dup_md_flag     =
1359                                         mdm->flags & 0x01;
1360
1361                                 udf_debug("Metadata Ident suffix=0x%x\n",
1362                                         (le16_to_cpu(
1363                                          ((__le16 *)
1364                                               mdm->partIdent.identSuffix)[0])));
1365                                 udf_debug("Metadata part num=%d\n",
1366                                         le16_to_cpu(mdm->partitionNum));
1367                                 udf_debug("Metadata part alloc unit size=%d\n",
1368                                         le32_to_cpu(mdm->allocUnitSize));
1369                                 udf_debug("Metadata file loc=%d\n",
1370                                         le32_to_cpu(mdm->metadataFileLoc));
1371                                 udf_debug("Mirror file loc=%d\n",
1372                                        le32_to_cpu(mdm->metadataMirrorFileLoc));
1373                                 udf_debug("Bitmap file loc=%d\n",
1374                                        le32_to_cpu(mdm->metadataBitmapFileLoc));
1375                                 udf_debug("Duplicate Flag: %d %d\n",
1376                                         mdata->s_dup_md_flag, mdm->flags);
1377                         } else {
1378                                 udf_debug("Unknown ident: %s\n",
1379                                           upm2->partIdent.ident);
1380                                 continue;
1381                         }
1382                         map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1383                         map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1384                 }
1385                 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1386                           i, map->s_partition_num, type,
1387                           map->s_volumeseqnum);
1388         }
1389
1390         if (fileset) {
1391                 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
1392
1393                 *fileset = lelb_to_cpu(la->extLocation);
1394                 udf_debug("FileSet found in LogicalVolDesc at block=%d, "
1395                           "partition=%d\n", fileset->logicalBlockNum,
1396                           fileset->partitionReferenceNum);
1397         }
1398         if (lvd->integritySeqExt.extLength)
1399                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1400
1401 out_bh:
1402         brelse(bh);
1403         return ret;
1404 }
1405
1406 /*
1407  * udf_load_logicalvolint
1408  *
1409  */
1410 static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
1411 {
1412         struct buffer_head *bh = NULL;
1413         uint16_t ident;
1414         struct udf_sb_info *sbi = UDF_SB(sb);
1415         struct logicalVolIntegrityDesc *lvid;
1416
1417         while (loc.extLength > 0 &&
1418                (bh = udf_read_tagged(sb, loc.extLocation,
1419                                      loc.extLocation, &ident)) &&
1420                ident == TAG_IDENT_LVID) {
1421                 sbi->s_lvid_bh = bh;
1422                 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1423
1424                 if (lvid->nextIntegrityExt.extLength)
1425                         udf_load_logicalvolint(sb,
1426                                 leea_to_cpu(lvid->nextIntegrityExt));
1427
1428                 if (sbi->s_lvid_bh != bh)
1429                         brelse(bh);
1430                 loc.extLength -= sb->s_blocksize;
1431                 loc.extLocation++;
1432         }
1433         if (sbi->s_lvid_bh != bh)
1434                 brelse(bh);
1435 }
1436
1437 /*
1438  * udf_process_sequence
1439  *
1440  * PURPOSE
1441  *      Process a main/reserve volume descriptor sequence.
1442  *
1443  * PRE-CONDITIONS
1444  *      sb                      Pointer to _locked_ superblock.
1445  *      block                   First block of first extent of the sequence.
1446  *      lastblock               Lastblock of first extent of the sequence.
1447  *
1448  * HISTORY
1449  *      July 1, 1997 - Andrew E. Mileski
1450  *      Written, tested, and released.
1451  */
1452 static noinline int udf_process_sequence(struct super_block *sb, long block,
1453                                 long lastblock, struct kernel_lb_addr *fileset)
1454 {
1455         struct buffer_head *bh = NULL;
1456         struct udf_vds_record vds[VDS_POS_LENGTH];
1457         struct udf_vds_record *curr;
1458         struct generic_desc *gd;
1459         struct volDescPtr *vdp;
1460         int done = 0;
1461         uint32_t vdsn;
1462         uint16_t ident;
1463         long next_s = 0, next_e = 0;
1464
1465         memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1466
1467         /*
1468          * Read the main descriptor sequence and find which descriptors
1469          * are in it.
1470          */
1471         for (; (!done && block <= lastblock); block++) {
1472
1473                 bh = udf_read_tagged(sb, block, block, &ident);
1474                 if (!bh) {
1475                         printk(KERN_ERR "udf: Block %Lu of volume descriptor "
1476                                "sequence is corrupted or we could not read "
1477                                "it.\n", (unsigned long long)block);
1478                         return 1;
1479                 }
1480
1481                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1482                 gd = (struct generic_desc *)bh->b_data;
1483                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1484                 switch (ident) {
1485                 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1486                         curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1487                         if (vdsn >= curr->volDescSeqNum) {
1488                                 curr->volDescSeqNum = vdsn;
1489                                 curr->block = block;
1490                         }
1491                         break;
1492                 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1493                         curr = &vds[VDS_POS_VOL_DESC_PTR];
1494                         if (vdsn >= curr->volDescSeqNum) {
1495                                 curr->volDescSeqNum = vdsn;
1496                                 curr->block = block;
1497
1498                                 vdp = (struct volDescPtr *)bh->b_data;
1499                                 next_s = le32_to_cpu(
1500                                         vdp->nextVolDescSeqExt.extLocation);
1501                                 next_e = le32_to_cpu(
1502                                         vdp->nextVolDescSeqExt.extLength);
1503                                 next_e = next_e >> sb->s_blocksize_bits;
1504                                 next_e += next_s;
1505                         }
1506                         break;
1507                 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1508                         curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1509                         if (vdsn >= curr->volDescSeqNum) {
1510                                 curr->volDescSeqNum = vdsn;
1511                                 curr->block = block;
1512                         }
1513                         break;
1514                 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1515                         curr = &vds[VDS_POS_PARTITION_DESC];
1516                         if (!curr->block)
1517                                 curr->block = block;
1518                         break;
1519                 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1520                         curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1521                         if (vdsn >= curr->volDescSeqNum) {
1522                                 curr->volDescSeqNum = vdsn;
1523                                 curr->block = block;
1524                         }
1525                         break;
1526                 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1527                         curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1528                         if (vdsn >= curr->volDescSeqNum) {
1529                                 curr->volDescSeqNum = vdsn;
1530                                 curr->block = block;
1531                         }
1532                         break;
1533                 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1534                         vds[VDS_POS_TERMINATING_DESC].block = block;
1535                         if (next_e) {
1536                                 block = next_s;
1537                                 lastblock = next_e;
1538                                 next_s = next_e = 0;
1539                         } else
1540                                 done = 1;
1541                         break;
1542                 }
1543                 brelse(bh);
1544         }
1545         /*
1546          * Now read interesting descriptors again and process them
1547          * in a suitable order
1548          */
1549         if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1550                 printk(KERN_ERR "udf: Primary Volume Descriptor not found!\n");
1551                 return 1;
1552         }
1553         if (udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block))
1554                 return 1;
1555
1556         if (vds[VDS_POS_LOGICAL_VOL_DESC].block && udf_load_logicalvol(sb,
1557             vds[VDS_POS_LOGICAL_VOL_DESC].block, fileset))
1558                 return 1;
1559
1560         if (vds[VDS_POS_PARTITION_DESC].block) {
1561                 /*
1562                  * We rescan the whole descriptor sequence to find
1563                  * partition descriptor blocks and process them.
1564                  */
1565                 for (block = vds[VDS_POS_PARTITION_DESC].block;
1566                      block < vds[VDS_POS_TERMINATING_DESC].block;
1567                      block++)
1568                         if (udf_load_partdesc(sb, block))
1569                                 return 1;
1570         }
1571
1572         return 0;
1573 }
1574
1575 static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh,
1576                              struct kernel_lb_addr *fileset)
1577 {
1578         struct anchorVolDescPtr *anchor;
1579         long main_s, main_e, reserve_s, reserve_e;
1580
1581         anchor = (struct anchorVolDescPtr *)bh->b_data;
1582
1583         /* Locate the main sequence */
1584         main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1585         main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1586         main_e = main_e >> sb->s_blocksize_bits;
1587         main_e += main_s;
1588
1589         /* Locate the reserve sequence */
1590         reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1591         reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1592         reserve_e = reserve_e >> sb->s_blocksize_bits;
1593         reserve_e += reserve_s;
1594
1595         /* Process the main & reserve sequences */
1596         /* responsible for finding the PartitionDesc(s) */
1597         if (!udf_process_sequence(sb, main_s, main_e, fileset))
1598                 return 1;
1599         return !udf_process_sequence(sb, reserve_s, reserve_e, fileset);
1600 }
1601
1602 /*
1603  * Check whether there is an anchor block in the given block and
1604  * load Volume Descriptor Sequence if so.
1605  */
1606 static int udf_check_anchor_block(struct super_block *sb, sector_t block,
1607                                   struct kernel_lb_addr *fileset)
1608 {
1609         struct buffer_head *bh;
1610         uint16_t ident;
1611         int ret;
1612
1613         if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
1614             udf_fixed_to_variable(block) >=
1615             sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits)
1616                 return 0;
1617
1618         bh = udf_read_tagged(sb, block, block, &ident);
1619         if (!bh)
1620                 return 0;
1621         if (ident != TAG_IDENT_AVDP) {
1622                 brelse(bh);
1623                 return 0;
1624         }
1625         ret = udf_load_sequence(sb, bh, fileset);
1626         brelse(bh);
1627         return ret;
1628 }
1629
1630 /* Search for an anchor volume descriptor pointer */
1631 static sector_t udf_scan_anchors(struct super_block *sb, sector_t lastblock,
1632                                  struct kernel_lb_addr *fileset)
1633 {
1634         sector_t last[6];
1635         int i;
1636         struct udf_sb_info *sbi = UDF_SB(sb);
1637         int last_count = 0;
1638
1639         /* First try user provided anchor */
1640         if (sbi->s_anchor) {
1641                 if (udf_check_anchor_block(sb, sbi->s_anchor, fileset))
1642                         return lastblock;
1643         }
1644         /*
1645          * according to spec, anchor is in either:
1646          *     block 256
1647          *     lastblock-256
1648          *     lastblock
1649          *  however, if the disc isn't closed, it could be 512.
1650          */
1651         if (udf_check_anchor_block(sb, sbi->s_session + 256, fileset))
1652                 return lastblock;
1653         /*
1654          * The trouble is which block is the last one. Drives often misreport
1655          * this so we try various possibilities.
1656          */
1657         last[last_count++] = lastblock;
1658         if (lastblock >= 1)
1659                 last[last_count++] = lastblock - 1;
1660         last[last_count++] = lastblock + 1;
1661         if (lastblock >= 2)
1662                 last[last_count++] = lastblock - 2;
1663         if (lastblock >= 150)
1664                 last[last_count++] = lastblock - 150;
1665         if (lastblock >= 152)
1666                 last[last_count++] = lastblock - 152;
1667
1668         for (i = 0; i < last_count; i++) {
1669                 if (last[i] >= sb->s_bdev->bd_inode->i_size >>
1670                                 sb->s_blocksize_bits)
1671                         continue;
1672                 if (udf_check_anchor_block(sb, last[i], fileset))
1673                         return last[i];
1674                 if (last[i] < 256)
1675                         continue;
1676                 if (udf_check_anchor_block(sb, last[i] - 256, fileset))
1677                         return last[i];
1678         }
1679
1680         /* Finally try block 512 in case media is open */
1681         if (udf_check_anchor_block(sb, sbi->s_session + 512, fileset))
1682                 return last[0];
1683         return 0;
1684 }
1685
1686 /*
1687  * Find an anchor volume descriptor and load Volume Descriptor Sequence from
1688  * area specified by it. The function expects sbi->s_lastblock to be the last
1689  * block on the media.
1690  *
1691  * Return 1 if ok, 0 if not found.
1692  *
1693  */
1694 static int udf_find_anchor(struct super_block *sb,
1695                            struct kernel_lb_addr *fileset)
1696 {
1697         sector_t lastblock;
1698         struct udf_sb_info *sbi = UDF_SB(sb);
1699
1700         lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1701         if (lastblock)
1702                 goto out;
1703
1704         /* No anchor found? Try VARCONV conversion of block numbers */
1705         UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
1706         /* Firstly, we try to not convert number of the last block */
1707         lastblock = udf_scan_anchors(sb,
1708                                 udf_variable_to_fixed(sbi->s_last_block),
1709                                 fileset);
1710         if (lastblock)
1711                 goto out;
1712
1713         /* Secondly, we try with converted number of the last block */
1714         lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1715         if (!lastblock) {
1716                 /* VARCONV didn't help. Clear it. */
1717                 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
1718                 return 0;
1719         }
1720 out:
1721         sbi->s_last_block = lastblock;
1722         return 1;
1723 }
1724
1725 /*
1726  * Check Volume Structure Descriptor, find Anchor block and load Volume
1727  * Descriptor Sequence
1728  */
1729 static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
1730                         int silent, struct kernel_lb_addr *fileset)
1731 {
1732         struct udf_sb_info *sbi = UDF_SB(sb);
1733         loff_t nsr_off;
1734
1735         if (!sb_set_blocksize(sb, uopt->blocksize)) {
1736                 if (!silent)
1737                         printk(KERN_WARNING "UDF-fs: Bad block size\n");
1738                 return 0;
1739         }
1740         sbi->s_last_block = uopt->lastblock;
1741         if (!uopt->novrs) {
1742                 /* Check that it is NSR02 compliant */
1743                 nsr_off = udf_check_vsd(sb);
1744                 if (!nsr_off) {
1745                         if (!silent)
1746                                 printk(KERN_WARNING "UDF-fs: No VRS found\n");
1747                         return 0;
1748                 }
1749                 if (nsr_off == -1)
1750                         udf_debug("Failed to read byte 32768. Assuming open "
1751                                   "disc. Skipping validity check\n");
1752                 if (!sbi->s_last_block)
1753                         sbi->s_last_block = udf_get_last_block(sb);
1754         } else {
1755                 udf_debug("Validity check skipped because of novrs option\n");
1756         }
1757
1758         /* Look for anchor block and load Volume Descriptor Sequence */
1759         sbi->s_anchor = uopt->anchor;
1760         if (!udf_find_anchor(sb, fileset)) {
1761                 if (!silent)
1762                         printk(KERN_WARNING "UDF-fs: No anchor found\n");
1763                 return 0;
1764         }
1765         return 1;
1766 }
1767
1768 static void udf_open_lvid(struct super_block *sb)
1769 {
1770         struct udf_sb_info *sbi = UDF_SB(sb);
1771         struct buffer_head *bh = sbi->s_lvid_bh;
1772         struct logicalVolIntegrityDesc *lvid;
1773         struct logicalVolIntegrityDescImpUse *lvidiu;
1774
1775         if (!bh)
1776                 return;
1777         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1778         lvidiu = udf_sb_lvidiu(sbi);
1779
1780         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1781         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1782         udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
1783                                 CURRENT_TIME);
1784         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN);
1785
1786         lvid->descTag.descCRC = cpu_to_le16(
1787                 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1788                         le16_to_cpu(lvid->descTag.descCRCLength)));
1789
1790         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1791         mark_buffer_dirty(bh);
1792         sbi->s_lvid_dirty = 0;
1793 }
1794
1795 static void udf_close_lvid(struct super_block *sb)
1796 {
1797         struct udf_sb_info *sbi = UDF_SB(sb);
1798         struct buffer_head *bh = sbi->s_lvid_bh;
1799         struct logicalVolIntegrityDesc *lvid;
1800         struct logicalVolIntegrityDescImpUse *lvidiu;
1801
1802         if (!bh)
1803                 return;
1804
1805         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1806         lvidiu = udf_sb_lvidiu(sbi);
1807         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1808         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1809         udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
1810         if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1811                 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1812         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1813                 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1814         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
1815                 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
1816         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1817
1818         lvid->descTag.descCRC = cpu_to_le16(
1819                         crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1820                                 le16_to_cpu(lvid->descTag.descCRCLength)));
1821
1822         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1823         mark_buffer_dirty(bh);
1824         sbi->s_lvid_dirty = 0;
1825 }
1826
1827 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
1828 {
1829         int i;
1830         int nr_groups = bitmap->s_nr_groups;
1831         int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
1832                                                 nr_groups);
1833
1834         for (i = 0; i < nr_groups; i++)
1835                 if (bitmap->s_block_bitmap[i])
1836                         brelse(bitmap->s_block_bitmap[i]);
1837
1838         if (size <= PAGE_SIZE)
1839                 kfree(bitmap);
1840         else
1841                 vfree(bitmap);
1842 }
1843
1844 static void udf_free_partition(struct udf_part_map *map)
1845 {
1846         int i;
1847         struct udf_meta_data *mdata;
1848
1849         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1850                 iput(map->s_uspace.s_table);
1851         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1852                 iput(map->s_fspace.s_table);
1853         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1854                 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
1855         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1856                 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
1857         if (map->s_partition_type == UDF_SPARABLE_MAP15)
1858                 for (i = 0; i < 4; i++)
1859                         brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
1860         else if (map->s_partition_type == UDF_METADATA_MAP25) {
1861                 mdata = &map->s_type_specific.s_metadata;
1862                 iput(mdata->s_metadata_fe);
1863                 mdata->s_metadata_fe = NULL;
1864
1865                 iput(mdata->s_mirror_fe);
1866                 mdata->s_mirror_fe = NULL;
1867
1868                 iput(mdata->s_bitmap_fe);
1869                 mdata->s_bitmap_fe = NULL;
1870         }
1871 }
1872
1873 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1874 {
1875         int i;
1876         int ret;
1877         struct inode *inode = NULL;
1878         struct udf_options uopt;
1879         struct kernel_lb_addr rootdir, fileset;
1880         struct udf_sb_info *sbi;
1881
1882         lock_kernel();
1883
1884         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1885         uopt.uid = -1;
1886         uopt.gid = -1;
1887         uopt.umask = 0;
1888         uopt.fmode = UDF_INVALID_MODE;
1889         uopt.dmode = UDF_INVALID_MODE;
1890
1891         sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1892         if (!sbi) {
1893                 unlock_kernel();
1894                 return -ENOMEM;
1895         }
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         unlock_kernel();
2042         return 0;
2043
2044 error_out:
2045         if (sbi->s_vat_inode)
2046                 iput(sbi->s_vat_inode);
2047         if (sbi->s_partitions)
2048                 for (i = 0; i < sbi->s_partitions; i++)
2049                         udf_free_partition(&sbi->s_partmaps[i]);
2050 #ifdef CONFIG_UDF_NLS
2051         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2052                 unload_nls(sbi->s_nls_map);
2053 #endif
2054         if (!(sb->s_flags & MS_RDONLY))
2055                 udf_close_lvid(sb);
2056         brelse(sbi->s_lvid_bh);
2057
2058         kfree(sbi->s_partmaps);
2059         kfree(sbi);
2060         sb->s_fs_info = NULL;
2061
2062         unlock_kernel();
2063         return -EINVAL;
2064 }
2065
2066 static void udf_error(struct super_block *sb, const char *function,
2067                       const char *fmt, ...)
2068 {
2069         va_list args;
2070
2071         if (!(sb->s_flags & MS_RDONLY)) {
2072                 /* mark sb error */
2073                 sb->s_dirt = 1;
2074         }
2075         va_start(args, fmt);
2076         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2077         va_end(args);
2078         printk(KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
2079                 sb->s_id, function, error_buf);
2080 }
2081
2082 void udf_warning(struct super_block *sb, const char *function,
2083                  const char *fmt, ...)
2084 {
2085         va_list args;
2086
2087         va_start(args, fmt);
2088         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2089         va_end(args);
2090         printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
2091                sb->s_id, function, error_buf);
2092 }
2093
2094 static void udf_put_super(struct super_block *sb)
2095 {
2096         int i;
2097         struct udf_sb_info *sbi;
2098
2099         sbi = UDF_SB(sb);
2100
2101         lock_kernel();
2102
2103         if (sbi->s_vat_inode)
2104                 iput(sbi->s_vat_inode);
2105         if (sbi->s_partitions)
2106                 for (i = 0; i < sbi->s_partitions; i++)
2107                         udf_free_partition(&sbi->s_partmaps[i]);
2108 #ifdef CONFIG_UDF_NLS
2109         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2110                 unload_nls(sbi->s_nls_map);
2111 #endif
2112         if (!(sb->s_flags & MS_RDONLY))
2113                 udf_close_lvid(sb);
2114         brelse(sbi->s_lvid_bh);
2115         kfree(sbi->s_partmaps);
2116         kfree(sb->s_fs_info);
2117         sb->s_fs_info = NULL;
2118
2119         unlock_kernel();
2120 }
2121
2122 static int udf_sync_fs(struct super_block *sb, int wait)
2123 {
2124         struct udf_sb_info *sbi = UDF_SB(sb);
2125
2126         mutex_lock(&sbi->s_alloc_mutex);
2127         if (sbi->s_lvid_dirty) {
2128                 /*
2129                  * Blockdevice will be synced later so we don't have to submit
2130                  * the buffer for IO
2131                  */
2132                 mark_buffer_dirty(sbi->s_lvid_bh);
2133                 sb->s_dirt = 0;
2134                 sbi->s_lvid_dirty = 0;
2135         }
2136         mutex_unlock(&sbi->s_alloc_mutex);
2137
2138         return 0;
2139 }
2140
2141 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
2142 {
2143         struct super_block *sb = dentry->d_sb;
2144         struct udf_sb_info *sbi = UDF_SB(sb);
2145         struct logicalVolIntegrityDescImpUse *lvidiu;
2146         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
2147
2148         if (sbi->s_lvid_bh != NULL)
2149                 lvidiu = udf_sb_lvidiu(sbi);
2150         else
2151                 lvidiu = NULL;
2152
2153         buf->f_type = UDF_SUPER_MAGIC;
2154         buf->f_bsize = sb->s_blocksize;
2155         buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
2156         buf->f_bfree = udf_count_free(sb);
2157         buf->f_bavail = buf->f_bfree;
2158         buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2159                                           le32_to_cpu(lvidiu->numDirs)) : 0)
2160                         + buf->f_bfree;
2161         buf->f_ffree = buf->f_bfree;
2162         buf->f_namelen = UDF_NAME_LEN - 2;
2163         buf->f_fsid.val[0] = (u32)id;
2164         buf->f_fsid.val[1] = (u32)(id >> 32);
2165
2166         return 0;
2167 }
2168
2169 static unsigned int udf_count_free_bitmap(struct super_block *sb,
2170                                           struct udf_bitmap *bitmap)
2171 {
2172         struct buffer_head *bh = NULL;
2173         unsigned int accum = 0;
2174         int index;
2175         int block = 0, newblock;
2176         struct kernel_lb_addr loc;
2177         uint32_t bytes;
2178         uint8_t *ptr;
2179         uint16_t ident;
2180         struct spaceBitmapDesc *bm;
2181
2182         lock_kernel();
2183
2184         loc.logicalBlockNum = bitmap->s_extPosition;
2185         loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
2186         bh = udf_read_ptagged(sb, &loc, 0, &ident);
2187
2188         if (!bh) {
2189                 printk(KERN_ERR "udf: udf_count_free failed\n");
2190                 goto out;
2191         } else if (ident != TAG_IDENT_SBD) {
2192                 brelse(bh);
2193                 printk(KERN_ERR "udf: udf_count_free failed\n");
2194                 goto out;
2195         }
2196
2197         bm = (struct spaceBitmapDesc *)bh->b_data;
2198         bytes = le32_to_cpu(bm->numOfBytes);
2199         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2200         ptr = (uint8_t *)bh->b_data;
2201
2202         while (bytes > 0) {
2203                 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2204                 accum += bitmap_weight((const unsigned long *)(ptr + index),
2205                                         cur_bytes * 8);
2206                 bytes -= cur_bytes;
2207                 if (bytes) {
2208                         brelse(bh);
2209                         newblock = udf_get_lb_pblock(sb, &loc, ++block);
2210                         bh = udf_tread(sb, newblock);
2211                         if (!bh) {
2212                                 udf_debug("read failed\n");
2213                                 goto out;
2214                         }
2215                         index = 0;
2216                         ptr = (uint8_t *)bh->b_data;
2217                 }
2218         }
2219         brelse(bh);
2220
2221 out:
2222         unlock_kernel();
2223
2224         return accum;
2225 }
2226
2227 static unsigned int udf_count_free_table(struct super_block *sb,
2228                                          struct inode *table)
2229 {
2230         unsigned int accum = 0;
2231         uint32_t elen;
2232         struct kernel_lb_addr eloc;
2233         int8_t etype;
2234         struct extent_position epos;
2235
2236         lock_kernel();
2237
2238         epos.block = UDF_I(table)->i_location;
2239         epos.offset = sizeof(struct unallocSpaceEntry);
2240         epos.bh = NULL;
2241
2242         while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2243                 accum += (elen >> table->i_sb->s_blocksize_bits);
2244
2245         brelse(epos.bh);
2246
2247         unlock_kernel();
2248
2249         return accum;
2250 }
2251
2252 static unsigned int udf_count_free(struct super_block *sb)
2253 {
2254         unsigned int accum = 0;
2255         struct udf_sb_info *sbi;
2256         struct udf_part_map *map;
2257
2258         sbi = UDF_SB(sb);
2259         if (sbi->s_lvid_bh) {
2260                 struct logicalVolIntegrityDesc *lvid =
2261                         (struct logicalVolIntegrityDesc *)
2262                         sbi->s_lvid_bh->b_data;
2263                 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
2264                         accum = le32_to_cpu(
2265                                         lvid->freeSpaceTable[sbi->s_partition]);
2266                         if (accum == 0xFFFFFFFF)
2267                                 accum = 0;
2268                 }
2269         }
2270
2271         if (accum)
2272                 return accum;
2273
2274         map = &sbi->s_partmaps[sbi->s_partition];
2275         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2276                 accum += udf_count_free_bitmap(sb,
2277                                                map->s_uspace.s_bitmap);
2278         }
2279         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
2280                 accum += udf_count_free_bitmap(sb,
2281                                                map->s_fspace.s_bitmap);
2282         }
2283         if (accum)
2284                 return accum;
2285
2286         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2287                 accum += udf_count_free_table(sb,
2288                                               map->s_uspace.s_table);
2289         }
2290         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
2291                 accum += udf_count_free_table(sb,
2292                                               map->s_fspace.s_table);
2293         }
2294
2295         return accum;
2296 }