fs/udf/super.c

   1 /*
   2  * super.c
   3  *
   4  * PURPOSE
   5  *  Super block routines for the OSTA-UDF(tm) filesystem.
   6  *
   7  * DESCRIPTION
   8  *  OSTA-UDF(tm) = Optical Storage Technology Association
   9  *  Universal Disk Format.
  10  *
  11  *  This code is based on version 2.00 of the UDF specification,
  12  *  and revision 3 of the ECMA 167 standard [equivalent to ISO 13346].
  13  *    http://www.osta.org/
  14  *    http://www.ecma.ch/
  15  *    http://www.iso.org/
  16  *
  17  * COPYRIGHT
  18  *  This file is distributed under the terms of the GNU General Public
  19  *  License (GPL). Copies of the GPL can be obtained from:
  20  *    ftp://prep.ai.mit.edu/pub/gnu/GPL
  21  *  Each contributing author retains all rights to their own work.
  22  *
  23  *  (C) 1998 Dave Boynton
  24  *  (C) 1998-2004 Ben Fennema
  25  *  (C) 2000 Stelias Computing Inc
  26  *
  27  * HISTORY
  28  *
  29  *  09/24/98 dgb  changed to allow compiling outside of kernel, and
  30  *                added some debugging.
  31  *  10/01/98 dgb  updated to allow (some) possibility of compiling w/2.0.34
  32  *  10/16/98      attempting some multi-session support
  33  *  10/17/98      added freespace count for "df"
  34  *  11/11/98 gr   added novrs option
  35  *  11/26/98 dgb  added fileset,anchor mount options
  36  *  12/06/98 blf  really hosed things royally. vat/sparing support. sequenced
  37  *                vol descs. rewrote option handling based on isofs
  38  *  12/20/98      find the free space bitmap (if it exists)
  39  */
  40
  41 #include "udfdecl.h"
  42
  43 #include <linux/blkdev.h>
  44 #include <linux/slab.h>
  45 #include <linux/kernel.h>
  46 #include <linux/module.h>
  47 #include <linux/parser.h>
  48 #include <linux/stat.h>
  49 #include <linux/cdrom.h>
  50 #include <linux/nls.h>
  51 #include <linux/smp_lock.h>
  52 #include <linux/buffer_head.h>
  53 #include <linux/vfs.h>
  54 #include <linux/vmalloc.h>
  55 #include <linux/errno.h>
  56 #include <linux/mount.h>
  57 #include <linux/seq_file.h>
  58 #include <linux/bitmap.h>
  59 #include <linux/crc-itu-t.h>
  60 #include <asm/byteorder.h>
  61
  62 #include "udf_sb.h"
  63 #include "udf_i.h"
  64
  65 #include <linux/init.h>
  66 #include <asm/uaccess.h>
  67
  68 #define VDS_POS_PRIMARY_VOL_DESC        0
  69 #define VDS_POS_UNALLOC_SPACE_DESC      1
  70 #define VDS_POS_LOGICAL_VOL_DESC        2
  71 #define VDS_POS_PARTITION_DESC          3
  72 #define VDS_POS_IMP_USE_VOL_DESC        4
  73 #define VDS_POS_VOL_DESC_PTR            5
  74 #define VDS_POS_TERMINATING_DESC        6
  75 #define VDS_POS_LENGTH                  7
  76
  77 #define UDF_DEFAULT_BLOCKSIZE 2048
  78
  79 static char error_buf[1024];
  80
  81 /* These are the "meat" - everything else is stuffing */
  82 static int udf_fill_super(struct super_block *, void *, int);
  83 static void udf_put_super(struct super_block *);
  84 static int udf_sync_fs(struct super_block *, int);
  85 static int udf_remount_fs(struct super_block *, int *, char *);
  86 static void udf_load_logicalvolint(struct super_block *, struct kernel_extent_ad);
  87 static int udf_find_fileset(struct super_block *, struct kernel_lb_addr *,
  88                             struct kernel_lb_addr *);
  89 static void udf_load_fileset(struct super_block *, struct buffer_head *,
  90                              struct kernel_lb_addr *);
  91 static void udf_open_lvid(struct super_block *);
  92 static void udf_close_lvid(struct super_block *);
  93 static unsigned int udf_count_free(struct super_block *);
  94 static int udf_statfs(struct dentry *, struct kstatfs *);
  95 static int udf_show_options(struct seq_file *, struct vfsmount *);
  96 static void udf_error(struct super_block *sb, const char *function,
  97                       const char *fmt, ...);
  98
  99 struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct udf_sb_info *sbi)
 100 {
 101         struct logicalVolIntegrityDesc *lvid =
 102                 (struct logicalVolIntegrityDesc *)sbi->s_lvid_bh->b_data;
 103         __u32 number_of_partitions = le32_to_cpu(lvid->numOfPartitions);
 104         __u32 offset = number_of_partitions * 2 *
 105                                 sizeof(uint32_t)/sizeof(uint8_t);
 106         return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
 107 }
 108
 109 /* UDF filesystem type */
 110 static int udf_get_sb(struct file_system_type *fs_type,
 111                       int flags, const char *dev_name, void *data,
 112                       struct vfsmount *mnt)
 113 {
 114         return get_sb_bdev(fs_type, flags, dev_name, data, udf_fill_super, mnt);
 115 }
 116
 117 static struct file_system_type udf_fstype = {
 118         .owner          = THIS_MODULE,
 119         .name           = "udf",
 120         .get_sb         = udf_get_sb,
 121         .kill_sb        = kill_block_super,
 122         .fs_flags       = FS_REQUIRES_DEV,
 123 };
 124
 125 static struct kmem_cache *udf_inode_cachep;
 126
 127 static struct inode *udf_alloc_inode(struct super_block *sb)
 128 {
 129         struct udf_inode_info *ei;
 130         ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
 131         if (!ei)
 132                 return NULL;
 133
 134         ei->i_unique = 0;
 135         ei->i_lenExtents = 0;
 136         ei->i_next_alloc_block = 0;
 137         ei->i_next_alloc_goal = 0;
 138         ei->i_strat4096 = 0;
 139
 140         return &ei->vfs_inode;
 141 }
 142
 143 static void udf_destroy_inode(struct inode *inode)
 144 {
 145         kmem_cache_free(udf_inode_cachep, UDF_I(inode));
 146 }
 147
 148 static void init_once(void *foo)
 149 {
 150         struct udf_inode_info *ei = (struct udf_inode_info *)foo;
 151
 152         ei->i_ext.i_data = NULL;
 153         inode_init_once(&ei->vfs_inode);
 154 }
 155
 156 static int init_inodecache(void)
 157 {
 158         udf_inode_cachep = kmem_cache_create("udf_inode_cache",
 159                                              sizeof(struct udf_inode_info),
 160                                              0, (SLAB_RECLAIM_ACCOUNT |
 161                                                  SLAB_MEM_SPREAD),
 162                                              init_once);
 163         if (!udf_inode_cachep)
 164                 return -ENOMEM;
 165         return 0;
 166 }
 167
 168 static void destroy_inodecache(void)
 169 {
 170         kmem_cache_destroy(udf_inode_cachep);
 171 }
 172
 173 /* Superblock operations */
 174 static const struct super_operations udf_sb_ops = {
 175         .alloc_inode    = udf_alloc_inode,
 176         .destroy_inode  = udf_destroy_inode,
 177         .write_inode    = udf_write_inode,
 178         .delete_inode   = udf_delete_inode,
 179         .clear_inode    = udf_clear_inode,
 180         .put_super      = udf_put_super,
 181         .sync_fs        = udf_sync_fs,
 182         .statfs         = udf_statfs,
 183         .remount_fs     = udf_remount_fs,
 184         .show_options   = udf_show_options,
 185 };
 186
 187 struct udf_options {
 188         unsigned char novrs;
 189         unsigned int blocksize;
 190         unsigned int session;
 191         unsigned int lastblock;
 192         unsigned int anchor;
 193         unsigned int volume;
 194         unsigned short partition;
 195         unsigned int fileset;
 196         unsigned int rootdir;
 197         unsigned int flags;
 198         mode_t umask;
 199         gid_t gid;
 200         uid_t uid;
 201         mode_t fmode;
 202         mode_t dmode;
 203         struct nls_table *nls_map;
 204 };
 205
 206 static int __init init_udf_fs(void)
 207 {
 208         int err;
 209
 210         err = init_inodecache();
 211         if (err)
 212                 goto out1;
 213         err = register_filesystem(&udf_fstype);
 214         if (err)
 215                 goto out;
 216
 217         return 0;
 218
 219 out:
 220         destroy_inodecache();
 221
 222 out1:
 223         return err;
 224 }
 225
 226 static void __exit exit_udf_fs(void)
 227 {
 228         unregister_filesystem(&udf_fstype);
 229         destroy_inodecache();
 230 }
 231
 232 module_init(init_udf_fs)
 233 module_exit(exit_udf_fs)
 234
 235 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
 236 {
 237         struct udf_sb_info *sbi = UDF_SB(sb);
 238
 239         sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map),
 240                                   GFP_KERNEL);
 241         if (!sbi->s_partmaps) {
 242                 udf_error(sb, __func__,
 243                           "Unable to allocate space for %d partition maps",
 244                           count);
 245                 sbi->s_partitions = 0;
 246                 return -ENOMEM;
 247         }
 248
 249         sbi->s_partitions = count;
 250         return 0;
 251 }
 252
 253 static int udf_show_options(struct seq_file *seq, struct vfsmount *mnt)
 254 {
 255         struct super_block *sb = mnt->mnt_sb;
 256         struct udf_sb_info *sbi = UDF_SB(sb);
 257
 258         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
 259                 seq_puts(seq, ",nostrict");
 260         if (UDF_QUERY_FLAG(sb, UDF_FLAG_BLOCKSIZE_SET))
 261                 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
 262         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
 263                 seq_puts(seq, ",unhide");
 264         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
 265                 seq_puts(seq, ",undelete");
 266         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
 267                 seq_puts(seq, ",noadinicb");
 268         if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
 269                 seq_puts(seq, ",shortad");
 270         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
 271                 seq_puts(seq, ",uid=forget");
 272         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_IGNORE))
 273                 seq_puts(seq, ",uid=ignore");
 274         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
 275                 seq_puts(seq, ",gid=forget");
 276         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE))
 277                 seq_puts(seq, ",gid=ignore");
 278         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
 279                 seq_printf(seq, ",uid=%u", sbi->s_uid);
 280         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
 281                 seq_printf(seq, ",gid=%u", sbi->s_gid);
 282         if (sbi->s_umask != 0)
 283                 seq_printf(seq, ",umask=%o", sbi->s_umask);
 284         if (sbi->s_fmode != UDF_INVALID_MODE)
 285                 seq_printf(seq, ",mode=%o", sbi->s_fmode);
 286         if (sbi->s_dmode != UDF_INVALID_MODE)
 287                 seq_printf(seq, ",dmode=%o", sbi->s_dmode);
 288         if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
 289                 seq_printf(seq, ",session=%u", sbi->s_session);
 290         if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
 291                 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
 292         if (sbi->s_anchor != 0)
 293                 seq_printf(seq, ",anchor=%u", sbi->s_anchor);
 294         /*
 295          * volume, partition, fileset and rootdir seem to be ignored
 296          * currently
 297          */
 298         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
 299                 seq_puts(seq, ",utf8");
 300         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
 301                 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
 302
 303         return 0;
 304 }
 305
 306 /*
 307  * udf_parse_options
 308  *
 309  * PURPOSE
 310  *      Parse mount options.
 311  *
 312  * DESCRIPTION
 313  *      The following mount options are supported:
 314  *
 315  *      gid=            Set the default group.
 316  *      umask=          Set the default umask.
 317  *      mode=           Set the default file permissions.
 318  *      dmode=          Set the default directory permissions.
 319  *      uid=            Set the default user.
 320  *      bs=             Set the block size.
 321  *      unhide          Show otherwise hidden files.
 322  *      undelete        Show deleted files in lists.
 323  *      adinicb         Embed data in the inode (default)
 324  *      noadinicb       Don't embed data in the inode
 325  *      shortad         Use short ad's
 326  *      longad          Use long ad's (default)
 327  *      nostrict        Unset strict conformance
 328  *      iocharset=      Set the NLS character set
 329  *
 330  *      The remaining are for debugging and disaster recovery:
 331  *
 332  *      novrs           Skip volume sequence recognition
 333  *
 334  *      The following expect a offset from 0.
 335  *
 336  *      session=        Set the CDROM session (default= last session)
 337  *      anchor=         Override standard anchor location. (default= 256)
 338  *      volume=         Override the VolumeDesc location. (unused)
 339  *      partition=      Override the PartitionDesc location. (unused)
 340  *      lastblock=      Set the last block of the filesystem/
 341  *
 342  *      The following expect a offset from the partition root.
 343  *
 344  *      fileset=        Override the fileset block location. (unused)
 345  *      rootdir=        Override the root directory location. (unused)
 346  *              WARNING: overriding the rootdir to a non-directory may
 347  *              yield highly unpredictable results.
 348  *
 349  * PRE-CONDITIONS
 350  *      options         Pointer to mount options string.
 351  *      uopts           Pointer to mount options variable.
 352  *
 353  * POST-CONDITIONS
 354  *      <return>        1       Mount options parsed okay.
 355  *      <return>        0       Error parsing mount options.
 356  *
 357  * HISTORY
 358  *      July 1, 1997 - Andrew E. Mileski
 359  *      Written, tested, and released.
 360  */
 361
 362 enum {
 363         Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
 364         Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
 365         Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
 366         Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
 367         Opt_rootdir, Opt_utf8, Opt_iocharset,
 368         Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore,
 369         Opt_fmode, Opt_dmode
 370 };
 371
 372 static const match_table_t tokens = {
 373         {Opt_novrs,     "novrs"},
 374         {Opt_nostrict,  "nostrict"},
 375         {Opt_bs,        "bs=%u"},
 376         {Opt_unhide,    "unhide"},
 377         {Opt_undelete,  "undelete"},
 378         {Opt_noadinicb, "noadinicb"},
 379         {Opt_adinicb,   "adinicb"},
 380         {Opt_shortad,   "shortad"},
 381         {Opt_longad,    "longad"},
 382         {Opt_uforget,   "uid=forget"},
 383         {Opt_uignore,   "uid=ignore"},
 384         {Opt_gforget,   "gid=forget"},
 385         {Opt_gignore,   "gid=ignore"},
 386         {Opt_gid,       "gid=%u"},
 387         {Opt_uid,       "uid=%u"},
 388         {Opt_umask,     "umask=%o"},
 389         {Opt_session,   "session=%u"},
 390         {Opt_lastblock, "lastblock=%u"},
 391         {Opt_anchor,    "anchor=%u"},
 392         {Opt_volume,    "volume=%u"},
 393         {Opt_partition, "partition=%u"},
 394         {Opt_fileset,   "fileset=%u"},
 395         {Opt_rootdir,   "rootdir=%u"},
 396         {Opt_utf8,      "utf8"},
 397         {Opt_iocharset, "iocharset=%s"},
 398         {Opt_fmode,     "mode=%o"},
 399         {Opt_dmode,     "dmode=%o"},
 400         {Opt_err,       NULL}
 401 };
 402
 403 static int udf_parse_options(char *options, struct udf_options *uopt,
 404                              bool remount)
 405 {
 406         char *p;
 407         int option;
 408
 409         uopt->novrs = 0;
 410         uopt->partition = 0xFFFF;
 411         uopt->session = 0xFFFFFFFF;
 412         uopt->lastblock = 0;
 413         uopt->anchor = 0;
 414         uopt->volume = 0xFFFFFFFF;
 415         uopt->rootdir = 0xFFFFFFFF;
 416         uopt->fileset = 0xFFFFFFFF;
 417         uopt->nls_map = NULL;
 418
 419         if (!options)
 420                 return 1;
 421
 422         while ((p = strsep(&options, ",")) != NULL) {
 423                 substring_t args[MAX_OPT_ARGS];
 424                 int token;
 425                 if (!*p)
 426                         continue;
 427
 428                 token = match_token(p, tokens, args);
 429                 switch (token) {
 430                 case Opt_novrs:
 431                         uopt->novrs = 1;
 432                         break;
 433                 case Opt_bs:
 434                         if (match_int(&args[0], &option))
 435                                 return 0;
 436                         uopt->blocksize = option;
 437                         uopt->flags |= (1 << UDF_FLAG_BLOCKSIZE_SET);
 438                         break;
 439                 case Opt_unhide:
 440                         uopt->flags |= (1 << UDF_FLAG_UNHIDE);
 441                         break;
 442                 case Opt_undelete:
 443                         uopt->flags |= (1 << UDF_FLAG_UNDELETE);
 444                         break;
 445                 case Opt_noadinicb:
 446                         uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
 447                         break;
 448                 case Opt_adinicb:
 449                         uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
 450                         break;
 451                 case Opt_shortad:
 452                         uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
 453                         break;
 454                 case Opt_longad:
 455                         uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
 456                         break;
 457                 case Opt_gid:
 458                         if (match_int(args, &option))
 459                                 return 0;
 460                         uopt->gid = option;
 461                         uopt->flags |= (1 << UDF_FLAG_GID_SET);
 462                         break;
 463                 case Opt_uid:
 464                         if (match_int(args, &option))
 465                                 return 0;
 466                         uopt->uid = option;
 467                         uopt->flags |= (1 << UDF_FLAG_UID_SET);
 468                         break;
 469                 case Opt_umask:
 470                         if (match_octal(args, &option))
 471                                 return 0;
 472                         uopt->umask = option;
 473                         break;
 474                 case Opt_nostrict:
 475                         uopt->flags &= ~(1 << UDF_FLAG_STRICT);
 476                         break;
 477                 case Opt_session:
 478                         if (match_int(args, &option))
 479                                 return 0;
 480                         uopt->session = option;
 481                         if (!remount)
 482                                 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
 483                         break;
 484                 case Opt_lastblock:
 485                         if (match_int(args, &option))
 486                                 return 0;
 487                         uopt->lastblock = option;
 488                         if (!remount)
 489                                 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
 490                         break;
 491                 case Opt_anchor:
 492                         if (match_int(args, &option))
 493                                 return 0;
 494                         uopt->anchor = option;
 495                         break;
 496                 case Opt_volume:
 497                         if (match_int(args, &option))
 498                                 return 0;
 499                         uopt->volume = option;
 500                         break;
 501                 case Opt_partition:
 502                         if (match_int(args, &option))
 503                                 return 0;
 504                         uopt->partition = option;
 505                         break;
 506                 case Opt_fileset:
 507                         if (match_int(args, &option))
 508                                 return 0;
 509                         uopt->fileset = option;
 510                         break;
 511                 case Opt_rootdir:
 512                         if (match_int(args, &option))
 513                                 return 0;
 514                         uopt->rootdir = option;
 515                         break;
 516                 case Opt_utf8:
 517                         uopt->flags |= (1 << UDF_FLAG_UTF8);
 518                         break;
 519 #ifdef CONFIG_UDF_NLS
 520                 case Opt_iocharset:
 521                         uopt->nls_map = load_nls(args[0].from);
 522                         uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
 523                         break;
 524 #endif
 525                 case Opt_uignore:
 526                         uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
 527                         break;
 528                 case Opt_uforget:
 529                         uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
 530                         break;
 531                 case Opt_gignore:
 532                         uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
 533                         break;
 534                 case Opt_gforget:
 535                         uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
 536                         break;
 537                 case Opt_fmode:
 538                         if (match_octal(args, &option))
 539                                 return 0;
 540                         uopt->fmode = option & 0777;
 541                         break;
 542                 case Opt_dmode:
 543                         if (match_octal(args, &option))
 544                                 return 0;
 545                         uopt->dmode = option & 0777;
 546                         break;
 547                 default:
 548                         printk(KERN_ERR "udf: bad mount option \"%s\" "
 549                                "or missing value\n", p);
 550                         return 0;
 551                 }
 552         }
 553         return 1;
 554 }
 555
 556 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
 557 {
 558         struct udf_options uopt;
 559         struct udf_sb_info *sbi = UDF_SB(sb);
 560
 561         uopt.flags = sbi->s_flags;
 562         uopt.uid   = sbi->s_uid;
 563         uopt.gid   = sbi->s_gid;
 564         uopt.umask = sbi->s_umask;
 565         uopt.fmode = sbi->s_fmode;
 566         uopt.dmode = sbi->s_dmode;
 567
 568         if (!udf_parse_options(options, &uopt, true))
 569                 return -EINVAL;
 570
 571         lock_kernel();
 572         sbi->s_flags = uopt.flags;
 573         sbi->s_uid   = uopt.uid;
 574         sbi->s_gid   = uopt.gid;
 575         sbi->s_umask = uopt.umask;
 576         sbi->s_fmode = uopt.fmode;
 577         sbi->s_dmode = uopt.dmode;
 578
 579         if (sbi->s_lvid_bh) {
 580                 int write_rev = le16_to_cpu(udf_sb_lvidiu(sbi)->minUDFWriteRev);
 581                 if (write_rev > UDF_MAX_WRITE_VERSION)
 582                         *flags |= MS_RDONLY;
 583         }
 584
 585         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) {
 586                 unlock_kernel();
 587                 return 0;
 588         }
 589         if (*flags & MS_RDONLY)
 590                 udf_close_lvid(sb);
 591         else
 592                 udf_open_lvid(sb);
 593
 594         unlock_kernel();
 595         return 0;
 596 }
 597
 598 /* Check Volume Structure Descriptors (ECMA 167 2/9.1) */
 599 /* We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
 600 static loff_t udf_check_vsd(struct super_block *sb)
 601 {
 602         struct volStructDesc *vsd = NULL;
 603         loff_t sector = 32768;
 604         int sectorsize;
 605         struct buffer_head *bh = NULL;
 606         int nsr02 = 0;
 607         int nsr03 = 0;
 608         struct udf_sb_info *sbi;
 609
 610         sbi = UDF_SB(sb);
 611         if (sb->s_blocksize < sizeof(struct volStructDesc))
 612                 sectorsize = sizeof(struct volStructDesc);
 613         else
 614                 sectorsize = sb->s_blocksize;
 615
 616         sector += (sbi->s_session << sb->s_blocksize_bits);
 617
 618         udf_debug("Starting at sector %u (%ld byte sectors)\n",
 619                   (unsigned int)(sector >> sb->s_blocksize_bits),
 620                   sb->s_blocksize);
 621         /* Process the sequence (if applicable) */
 622         for (; !nsr02 && !nsr03; sector += sectorsize) {
 623                 /* Read a block */
 624                 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
 625                 if (!bh)
 626                         break;
 627
 628                 /* Look for ISO  descriptors */
 629                 vsd = (struct volStructDesc *)(bh->b_data +
 630                                               (sector & (sb->s_blocksize - 1)));
 631
 632                 if (vsd->stdIdent[0] == 0) {
 633                         brelse(bh);
 634                         break;
 635                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
 636                                     VSD_STD_ID_LEN)) {
 637                         switch (vsd->structType) {
 638                         case 0:
 639                                 udf_debug("ISO9660 Boot Record found\n");
 640                                 break;
 641                         case 1:
 642                                 udf_debug("ISO9660 Primary Volume Descriptor "
 643                                           "found\n");
 644                                 break;
 645                         case 2:
 646                                 udf_debug("ISO9660 Supplementary Volume "
 647                                           "Descriptor found\n");
 648                                 break;
 649                         case 3:
 650                                 udf_debug("ISO9660 Volume Partition Descriptor "
 651                                           "found\n");
 652                                 break;
 653                         case 255:
 654                                 udf_debug("ISO9660 Volume Descriptor Set "
 655                                           "Terminator found\n");
 656                                 break;
 657                         default:
 658                                 udf_debug("ISO9660 VRS (%u) found\n",
 659                                           vsd->structType);
 660                                 break;
 661                         }
 662                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
 663                                     VSD_STD_ID_LEN))
 664                         ; /* nothing */
 665                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
 666                                     VSD_STD_ID_LEN)) {
 667                         brelse(bh);
 668                         break;
 669                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
 670                                     VSD_STD_ID_LEN))
 671                         nsr02 = sector;
 672                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
 673                                     VSD_STD_ID_LEN))
 674                         nsr03 = sector;
 675                 brelse(bh);
 676         }
 677
 678         if (nsr03)
 679                 return nsr03;
 680         else if (nsr02)
 681                 return nsr02;
 682         else if (sector - (sbi->s_session << sb->s_blocksize_bits) == 32768)
 683                 return -1;
 684         else
 685                 return 0;
 686 }
 687
 688 static int udf_find_fileset(struct super_block *sb,
 689                             struct kernel_lb_addr *fileset,
 690                             struct kernel_lb_addr *root)
 691 {
 692         struct buffer_head *bh = NULL;
 693         long lastblock;
 694         uint16_t ident;
 695         struct udf_sb_info *sbi;
 696
 697         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
 698             fileset->partitionReferenceNum != 0xFFFF) {
 699                 bh = udf_read_ptagged(sb, fileset, 0, &ident);
 700
 701                 if (!bh) {
 702                         return 1;
 703                 } else if (ident != TAG_IDENT_FSD) {
 704                         brelse(bh);
 705                         return 1;
 706                 }
 707
 708         }
 709
 710         sbi = UDF_SB(sb);
 711         if (!bh) {
 712                 /* Search backwards through the partitions */
 713                 struct kernel_lb_addr newfileset;
 714
 715 /* --> cvg: FIXME - is it reasonable? */
 716                 return 1;
 717
 718                 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
 719                      (newfileset.partitionReferenceNum != 0xFFFF &&
 720                       fileset->logicalBlockNum == 0xFFFFFFFF &&
 721                       fileset->partitionReferenceNum == 0xFFFF);
 722                      newfileset.partitionReferenceNum--) {
 723                         lastblock = sbi->s_partmaps
 724                                         [newfileset.partitionReferenceNum]
 725                                                 .s_partition_len;
 726                         newfileset.logicalBlockNum = 0;
 727
 728                         do {
 729                                 bh = udf_read_ptagged(sb, &newfileset, 0,
 730                                                       &ident);
 731                                 if (!bh) {
 732                                         newfileset.logicalBlockNum++;
 733                                         continue;
 734                                 }
 735
 736                                 switch (ident) {
 737                                 case TAG_IDENT_SBD:
 738                                 {
 739                                         struct spaceBitmapDesc *sp;
 740                                         sp = (struct spaceBitmapDesc *)
 741                                                                 bh->b_data;
 742                                         newfileset.logicalBlockNum += 1 +
 743                                                 ((le32_to_cpu(sp->numOfBytes) +
 744                                                   sizeof(struct spaceBitmapDesc)
 745                                                   - 1) >> sb->s_blocksize_bits);
 746                                         brelse(bh);
 747                                         break;
 748                                 }
 749                                 case TAG_IDENT_FSD:
 750                                         *fileset = newfileset;
 751                                         break;
 752                                 default:
 753                                         newfileset.logicalBlockNum++;
 754                                         brelse(bh);
 755                                         bh = NULL;
 756                                         break;
 757                                 }
 758                         } while (newfileset.logicalBlockNum < lastblock &&
 759                                  fileset->logicalBlockNum == 0xFFFFFFFF &&
 760                                  fileset->partitionReferenceNum == 0xFFFF);
 761                 }
 762         }
 763
 764         if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
 765              fileset->partitionReferenceNum != 0xFFFF) && bh) {
 766                 udf_debug("Fileset at block=%d, partition=%d\n",
 767                           fileset->logicalBlockNum,
 768                           fileset->partitionReferenceNum);
 769
 770                 sbi->s_partition = fileset->partitionReferenceNum;
 771                 udf_load_fileset(sb, bh, root);
 772                 brelse(bh);
 773                 return 0;
 774         }
 775         return 1;
 776 }
 777
 778 static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
 779 {
 780         struct primaryVolDesc *pvoldesc;
 781         struct ustr *instr, *outstr;
 782         struct buffer_head *bh;
 783         uint16_t ident;
 784         int ret = 1;
 785
 786         instr = kmalloc(sizeof(struct ustr), GFP_NOFS);
 787         if (!instr)
 788                 return 1;
 789
 790         outstr = kmalloc(sizeof(struct ustr), GFP_NOFS);
 791         if (!outstr)
 792                 goto out1;
 793
 794         bh = udf_read_tagged(sb, block, block, &ident);
 795         if (!bh)
 796                 goto out2;
 797
 798         BUG_ON(ident != TAG_IDENT_PVD);
 799
 800         pvoldesc = (struct primaryVolDesc *)bh->b_data;
 801
 802         if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
 803                               pvoldesc->recordingDateAndTime)) {
 804 #ifdef UDFFS_DEBUG
 805                 struct timestamp *ts = &pvoldesc->recordingDateAndTime;
 806                 udf_debug("recording time %04u/%02u/%02u"
 807                           " %02u:%02u (%x)\n",
 808                           le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
 809                           ts->minute, le16_to_cpu(ts->typeAndTimezone));
 810 #endif
 811         }
 812
 813         if (!udf_build_ustr(instr, pvoldesc->volIdent, 32))
 814                 if (udf_CS0toUTF8(outstr, instr)) {
 815                         strncpy(UDF_SB(sb)->s_volume_ident, outstr->u_name,
 816                                 outstr->u_len > 31 ? 31 : outstr->u_len);
 817                         udf_debug("volIdent[] = '%s'\n",
 818                                         UDF_SB(sb)->s_volume_ident);
 819                 }
 820
 821         if (!udf_build_ustr(instr, pvoldesc->volSetIdent, 128))
 822                 if (udf_CS0toUTF8(outstr, instr))
 823                         udf_debug("volSetIdent[] = '%s'\n", outstr->u_name);
 824
 825         brelse(bh);
 826         ret = 0;
 827 out2:
 828         kfree(outstr);
 829 out1:
 830         kfree(instr);
 831         return ret;
 832 }
 833
 834 static int udf_load_metadata_files(struct super_block *sb, int partition)
 835 {
 836         struct udf_sb_info *sbi = UDF_SB(sb);
 837         struct udf_part_map *map;
 838         struct udf_meta_data *mdata;
 839         struct kernel_lb_addr addr;
 840         int fe_error = 0;
 841
 842         map = &sbi->s_partmaps[partition];
 843         mdata = &map->s_type_specific.s_metadata;
 844
 845         /* metadata address */
 846         addr.logicalBlockNum =  mdata->s_meta_file_loc;
 847         addr.partitionReferenceNum = map->s_partition_num;
 848
 849         udf_debug("Metadata file location: block = %d part = %d\n",
 850                           addr.logicalBlockNum, addr.partitionReferenceNum);
 851
 852         mdata->s_metadata_fe = udf_iget(sb, &addr);
 853
 854         if (mdata->s_metadata_fe == NULL) {
 855                 udf_warning(sb, __func__, "metadata inode efe not found, "
 856                                 "will try mirror inode.");
 857                 fe_error = 1;
 858         } else if (UDF_I(mdata->s_metadata_fe)->i_alloc_type !=
 859                  ICBTAG_FLAG_AD_SHORT) {
 860                 udf_warning(sb, __func__, "metadata inode efe does not have "
 861                         "short allocation descriptors!");
 862                 fe_error = 1;
 863                 iput(mdata->s_metadata_fe);
 864                 mdata->s_metadata_fe = NULL;
 865         }
 866
 867         /* mirror file entry */
 868         addr.logicalBlockNum = mdata->s_mirror_file_loc;
 869         addr.partitionReferenceNum = map->s_partition_num;
 870
 871         udf_debug("Mirror metadata file location: block = %d part = %d\n",
 872                           addr.logicalBlockNum, addr.partitionReferenceNum);
 873
 874         mdata->s_mirror_fe = udf_iget(sb, &addr);
 875
 876         if (mdata->s_mirror_fe == NULL) {
 877                 if (fe_error) {
 878                         udf_error(sb, __func__, "mirror inode efe not found "
 879                         "and metadata inode is missing too, exiting...");
 880                         goto error_exit;
 881                 } else
 882                         udf_warning(sb, __func__, "mirror inode efe not found,"
 883                                         " but metadata inode is OK");
 884         } else if (UDF_I(mdata->s_mirror_fe)->i_alloc_type !=
 885                  ICBTAG_FLAG_AD_SHORT) {
 886                 udf_warning(sb, __func__, "mirror inode efe does not have "
 887                         "short allocation descriptors!");
 888                 iput(mdata->s_mirror_fe);
 889                 mdata->s_mirror_fe = NULL;
 890                 if (fe_error)
 891                         goto error_exit;
 892         }
 893
 894         /*
 895          * bitmap file entry
 896          * Note:
 897          * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
 898         */
 899         if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
 900                 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
 901                 addr.partitionReferenceNum = map->s_partition_num;
 902
 903                 udf_debug("Bitmap file location: block = %d part = %d\n",
 904                         addr.logicalBlockNum, addr.partitionReferenceNum);
 905
 906                 mdata->s_bitmap_fe = udf_iget(sb, &addr);
 907
 908                 if (mdata->s_bitmap_fe == NULL) {
 909                         if (sb->s_flags & MS_RDONLY)
 910                                 udf_warning(sb, __func__, "bitmap inode efe "
 911                                         "not found but it's ok since the disc"
 912                                         " is mounted read-only");
 913                         else {
 914                                 udf_error(sb, __func__, "bitmap inode efe not "
 915                                         "found and attempted read-write mount");
 916                                 goto error_exit;
 917                         }
 918                 }
 919         }
 920
 921         udf_debug("udf_load_metadata_files Ok\n");
 922
 923         return 0;
 924
 925 error_exit:
 926         return 1;
 927 }
 928
 929 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
 930                              struct kernel_lb_addr *root)
 931 {
 932         struct fileSetDesc *fset;
 933
 934         fset = (struct fileSetDesc *)bh->b_data;
 935
 936         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
 937
 938         UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
 939
 940         udf_debug("Rootdir at block=%d, partition=%d\n",
 941                   root->logicalBlockNum, root->partitionReferenceNum);
 942 }
 943
 944 int udf_compute_nr_groups(struct super_block *sb, u32 partition)
 945 {
 946         struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
 947         return DIV_ROUND_UP(map->s_partition_len +
 948                             (sizeof(struct spaceBitmapDesc) << 3),
 949                             sb->s_blocksize * 8);
 950 }
 951
 952 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
 953 {
 954         struct udf_bitmap *bitmap;
 955         int nr_groups;
 956         int size;
 957
 958         nr_groups = udf_compute_nr_groups(sb, index);
 959         size = sizeof(struct udf_bitmap) +
 960                 (sizeof(struct buffer_head *) * nr_groups);
 961
 962         if (size <= PAGE_SIZE)
 963                 bitmap = kmalloc(size, GFP_KERNEL);
 964         else
 965                 bitmap = vmalloc(size); /* TODO: get rid of vmalloc */
 966
 967         if (bitmap == NULL) {
 968                 udf_error(sb, __func__,
 969                           "Unable to allocate space for bitmap "
 970                           "and %d buffer_head pointers", nr_groups);
 971                 return NULL;
 972         }
 973
 974         memset(bitmap, 0x00, size);
 975         bitmap->s_block_bitmap = (struct buffer_head **)(bitmap + 1);
 976         bitmap->s_nr_groups = nr_groups;
 977         return bitmap;
 978 }
 979
 980 static int udf_fill_partdesc_info(struct super_block *sb,
 981                 struct partitionDesc *p, int p_index)
 982 {
 983         struct udf_part_map *map;
 984         struct udf_sb_info *sbi = UDF_SB(sb);
 985         struct partitionHeaderDesc *phd;
 986
 987         map = &sbi->s_partmaps[p_index];
 988
 989         map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
 990         map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
 991
 992         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
 993                 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
 994         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
 995                 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
 996         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
 997                 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
 998         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
 999                 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
1000
1001         udf_debug("Partition (%d type %x) starts at physical %d, "
1002                   "block length %d\n", p_index,
1003                   map->s_partition_type, map->s_partition_root,
1004                   map->s_partition_len);
1005
1006         if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1007             strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
1008                 return 0;
1009
1010         phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1011         if (phd->unallocSpaceTable.extLength) {
1012                 struct kernel_lb_addr loc = {
1013                         .logicalBlockNum = le32_to_cpu(
1014                                 phd->unallocSpaceTable.extPosition),
1015                         .partitionReferenceNum = p_index,
1016                 };
1017
1018                 map->s_uspace.s_table = udf_iget(sb, &loc);
1019                 if (!map->s_uspace.s_table) {
1020                         udf_debug("cannot load unallocSpaceTable (part %d)\n",
1021                                         p_index);
1022                         return 1;
1023                 }
1024                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1025                 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
1026                                 p_index, map->s_uspace.s_table->i_ino);
1027         }
1028
1029         if (phd->unallocSpaceBitmap.extLength) {
1030                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1031                 if (!bitmap)
1032                         return 1;
1033                 map->s_uspace.s_bitmap = bitmap;
1034                 bitmap->s_extLength = le32_to_cpu(
1035                                 phd->unallocSpaceBitmap.extLength);
1036                 bitmap->s_extPosition = le32_to_cpu(
1037                                 phd->unallocSpaceBitmap.extPosition);
1038                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1039                 udf_debug("unallocSpaceBitmap (part %d) @ %d\n", p_index,
1040                                                 bitmap->s_extPosition);
1041         }
1042
1043         if (phd->partitionIntegrityTable.extLength)
1044                 udf_debug("partitionIntegrityTable (part %d)\n", p_index);
1045
1046         if (phd->freedSpaceTable.extLength) {
1047                 struct kernel_lb_addr loc = {
1048                         .logicalBlockNum = le32_to_cpu(
1049                                 phd->freedSpaceTable.extPosition),
1050                         .partitionReferenceNum = p_index,
1051                 };
1052
1053                 map->s_fspace.s_table = udf_iget(sb, &loc);
1054                 if (!map->s_fspace.s_table) {
1055                         udf_debug("cannot load freedSpaceTable (part %d)\n",
1056                                 p_index);
1057                         return 1;
1058                 }
1059
1060                 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
1061                 udf_debug("freedSpaceTable (part %d) @ %ld\n",
1062                                 p_index, map->s_fspace.s_table->i_ino);
1063         }
1064
1065         if (phd->freedSpaceBitmap.extLength) {
1066                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1067                 if (!bitmap)
1068                         return 1;
1069                 map->s_fspace.s_bitmap = bitmap;
1070                 bitmap->s_extLength = le32_to_cpu(
1071                                 phd->freedSpaceBitmap.extLength);
1072                 bitmap->s_extPosition = le32_to_cpu(
1073                                 phd->freedSpaceBitmap.extPosition);
1074                 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1075                 udf_debug("freedSpaceBitmap (part %d) @ %d\n", p_index,
1076                                         bitmap->s_extPosition);
1077         }
1078         return 0;
1079 }
1080
1081 static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1082 {
1083         struct udf_sb_info *sbi = UDF_SB(sb);
1084         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1085         struct kernel_lb_addr ino;
1086         struct buffer_head *bh = NULL;
1087         struct udf_inode_info *vati;
1088         uint32_t pos;
1089         struct virtualAllocationTable20 *vat20;
1090         sector_t blocks = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
1091
1092         /* VAT file entry is in the last recorded block */
1093         ino.partitionReferenceNum = type1_index;
1094         ino.logicalBlockNum = sbi->s_last_block - map->s_partition_root;
1095         sbi->s_vat_inode = udf_iget(sb, &ino);
1096         if (!sbi->s_vat_inode &&
1097             sbi->s_last_block != blocks - 1) {
1098                 printk(KERN_NOTICE "UDF-fs: Failed to read VAT inode from the"
1099                        " last recorded block (%lu), retrying with the last "
1100                        "block of the device (%lu).\n",
1101                        (unsigned long)sbi->s_last_block,
1102                        (unsigned long)blocks - 1);
1103                 ino.partitionReferenceNum = type1_index;
1104                 ino.logicalBlockNum = blocks - 1 - map->s_partition_root;
1105                 sbi->s_vat_inode = udf_iget(sb, &ino);
1106         }
1107         if (!sbi->s_vat_inode)
1108                 return 1;
1109
1110         if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1111                 map->s_type_specific.s_virtual.s_start_offset = 0;
1112                 map->s_type_specific.s_virtual.s_num_entries =
1113                         (sbi->s_vat_inode->i_size - 36) >> 2;
1114         } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1115                 vati = UDF_I(sbi->s_vat_inode);
1116                 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1117                         pos = udf_block_map(sbi->s_vat_inode, 0);
1118                         bh = sb_bread(sb, pos);
1119                         if (!bh)
1120                                 return 1;
1121                         vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1122                 } else {
1123                         vat20 = (struct virtualAllocationTable20 *)
1124                                                         vati->i_ext.i_data;
1125                 }
1126
1127                 map->s_type_specific.s_virtual.s_start_offset =
1128                         le16_to_cpu(vat20->lengthHeader);
1129                 map->s_type_specific.s_virtual.s_num_entries =
1130                         (sbi->s_vat_inode->i_size -
1131                                 map->s_type_specific.s_virtual.
1132                                         s_start_offset) >> 2;
1133                 brelse(bh);
1134         }
1135         return 0;
1136 }
1137
1138 static int udf_load_partdesc(struct super_block *sb, sector_t block)
1139 {
1140         struct buffer_head *bh;
1141         struct partitionDesc *p;
1142         struct udf_part_map *map;
1143         struct udf_sb_info *sbi = UDF_SB(sb);
1144         int i, type1_idx;
1145         uint16_t partitionNumber;
1146         uint16_t ident;
1147         int ret = 0;
1148
1149         bh = udf_read_tagged(sb, block, block, &ident);
1150         if (!bh)
1151                 return 1;
1152         if (ident != TAG_IDENT_PD)
1153                 goto out_bh;
1154
1155         p = (struct partitionDesc *)bh->b_data;
1156         partitionNumber = le16_to_cpu(p->partitionNumber);
1157
1158         /* First scan for TYPE1, SPARABLE and METADATA partitions */
1159         for (i = 0; i < sbi->s_partitions; i++) {
1160                 map = &sbi->s_partmaps[i];
1161                 udf_debug("Searching map: (%d == %d)\n",
1162                           map->s_partition_num, partitionNumber);
1163                 if (map->s_partition_num == partitionNumber &&
1164                     (map->s_partition_type == UDF_TYPE1_MAP15 ||
1165                      map->s_partition_type == UDF_SPARABLE_MAP15))
1166                         break;
1167         }
1168
1169         if (i >= sbi->s_partitions) {
1170                 udf_debug("Partition (%d) not found in partition map\n",
1171                           partitionNumber);
1172                 goto out_bh;
1173         }
1174
1175         ret = udf_fill_partdesc_info(sb, p, i);
1176
1177         /*
1178          * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1179          * PHYSICAL partitions are already set up
1180          */
1181         type1_idx = i;
1182         for (i = 0; i < sbi->s_partitions; i++) {
1183                 map = &sbi->s_partmaps[i];
1184
1185                 if (map->s_partition_num == partitionNumber &&
1186                     (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1187                      map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1188                      map->s_partition_type == UDF_METADATA_MAP25))
1189                         break;
1190         }
1191
1192         if (i >= sbi->s_partitions)
1193                 goto out_bh;
1194
1195         ret = udf_fill_partdesc_info(sb, p, i);
1196         if (ret)
1197                 goto out_bh;
1198
1199         if (map->s_partition_type == UDF_METADATA_MAP25) {
1200                 ret = udf_load_metadata_files(sb, i);
1201                 if (ret) {
1202                         printk(KERN_ERR "UDF-fs: error loading MetaData "
1203                         "partition map %d\n", i);
1204                         goto out_bh;
1205                 }
1206         } else {
1207                 ret = udf_load_vat(sb, i, type1_idx);
1208                 if (ret)
1209                         goto out_bh;
1210                 /*
1211                  * Mark filesystem read-only if we have a partition with
1212                  * virtual map since we don't handle writing to it (we
1213                  * overwrite blocks instead of relocating them).
1214                  */
1215                 sb->s_flags |= MS_RDONLY;
1216                 printk(KERN_NOTICE "UDF-fs: Filesystem marked read-only "
1217                         "because writing to pseudooverwrite partition is "
1218                         "not implemented.\n");
1219         }
1220 out_bh:
1221         /* In case loading failed, we handle cleanup in udf_fill_super */
1222         brelse(bh);
1223         return ret;
1224 }
1225
1226 static int udf_load_logicalvol(struct super_block *sb, sector_t block,
1227                                struct kernel_lb_addr *fileset)
1228 {
1229         struct logicalVolDesc *lvd;
1230         int i, j, offset;
1231         uint8_t type;
1232         struct udf_sb_info *sbi = UDF_SB(sb);
1233         struct genericPartitionMap *gpm;
1234         uint16_t ident;
1235         struct buffer_head *bh;
1236         int ret = 0;
1237
1238         bh = udf_read_tagged(sb, block, block, &ident);
1239         if (!bh)
1240                 return 1;
1241         BUG_ON(ident != TAG_IDENT_LVD);
1242         lvd = (struct logicalVolDesc *)bh->b_data;
1243
1244         i = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1245         if (i != 0) {
1246                 ret = i;
1247                 goto out_bh;
1248         }
1249
1250         for (i = 0, offset = 0;
1251              i < sbi->s_partitions && offset < le32_to_cpu(lvd->mapTableLength);
1252              i++, offset += gpm->partitionMapLength) {
1253                 struct udf_part_map *map = &sbi->s_partmaps[i];
1254                 gpm = (struct genericPartitionMap *)
1255                                 &(lvd->partitionMaps[offset]);
1256                 type = gpm->partitionMapType;
1257                 if (type == 1) {
1258                         struct genericPartitionMap1 *gpm1 =
1259                                 (struct genericPartitionMap1 *)gpm;
1260                         map->s_partition_type = UDF_TYPE1_MAP15;
1261                         map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1262                         map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1263                         map->s_partition_func = NULL;
1264                 } else if (type == 2) {
1265                         struct udfPartitionMap2 *upm2 =
1266                                                 (struct udfPartitionMap2 *)gpm;
1267                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1268                                                 strlen(UDF_ID_VIRTUAL))) {
1269                                 u16 suf =
1270                                         le16_to_cpu(((__le16 *)upm2->partIdent.
1271                                                         identSuffix)[0]);
1272                                 if (suf < 0x0200) {
1273                                         map->s_partition_type =
1274                                                         UDF_VIRTUAL_MAP15;
1275                                         map->s_partition_func =
1276                                                         udf_get_pblock_virt15;
1277                                 } else {
1278                                         map->s_partition_type =
1279                                                         UDF_VIRTUAL_MAP20;
1280                                         map->s_partition_func =
1281                                                         udf_get_pblock_virt20;
1282                                 }
1283                         } else if (!strncmp(upm2->partIdent.ident,
1284                                                 UDF_ID_SPARABLE,
1285                                                 strlen(UDF_ID_SPARABLE))) {
1286                                 uint32_t loc;
1287                                 struct sparingTable *st;
1288                                 struct sparablePartitionMap *spm =
1289                                         (struct sparablePartitionMap *)gpm;
1290
1291                                 map->s_partition_type = UDF_SPARABLE_MAP15;
1292                                 map->s_type_specific.s_sparing.s_packet_len =
1293                                                 le16_to_cpu(spm->packetLength);
1294                                 for (j = 0; j < spm->numSparingTables; j++) {
1295                                         struct buffer_head *bh2;
1296
1297                                         loc = le32_to_cpu(
1298                                                 spm->locSparingTable[j]);
1299                                         bh2 = udf_read_tagged(sb, loc, loc,
1300                                                              &ident);
1301                                         map->s_type_specific.s_sparing.
1302                                                         s_spar_map[j] = bh2;
1303
1304                                         if (bh2 == NULL)
1305                                                 continue;
1306
1307                                         st = (struct sparingTable *)bh2->b_data;
1308                                         if (ident != 0 || strncmp(
1309                                                 st->sparingIdent.ident,
1310                                                 UDF_ID_SPARING,
1311                                                 strlen(UDF_ID_SPARING))) {
1312                                                 brelse(bh2);
1313                                                 map->s_type_specific.s_sparing.
1314                                                         s_spar_map[j] = NULL;
1315                                         }
1316                                 }
1317                                 map->s_partition_func = udf_get_pblock_spar15;
1318                         } else if (!strncmp(upm2->partIdent.ident,
1319                                                 UDF_ID_METADATA,
1320                                                 strlen(UDF_ID_METADATA))) {
1321                                 struct udf_meta_data *mdata =
1322                                         &map->s_type_specific.s_metadata;
1323                                 struct metadataPartitionMap *mdm =
1324                                                 (struct metadataPartitionMap *)
1325                                                 &(lvd->partitionMaps[offset]);
1326                                 udf_debug("Parsing Logical vol part %d "
1327                                         "type %d  id=%s\n", i, type,
1328                                         UDF_ID_METADATA);
1329
1330                                 map->s_partition_type = UDF_METADATA_MAP25;
1331                                 map->s_partition_func = udf_get_pblock_meta25;
1332
1333                                 mdata->s_meta_file_loc   =
1334                                         le32_to_cpu(mdm->metadataFileLoc);
1335                                 mdata->s_mirror_file_loc =
1336                                         le32_to_cpu(mdm->metadataMirrorFileLoc);
1337                                 mdata->s_bitmap_file_loc =
1338                                         le32_to_cpu(mdm->metadataBitmapFileLoc);
1339                                 mdata->s_alloc_unit_size =
1340                                         le32_to_cpu(mdm->allocUnitSize);
1341                                 mdata->s_align_unit_size =
1342                                         le16_to_cpu(mdm->alignUnitSize);
1343                                 mdata->s_dup_md_flag     =
1344                                         mdm->flags & 0x01;
1345
1346                                 udf_debug("Metadata Ident suffix=0x%x\n",
1347                                         (le16_to_cpu(
1348                                          ((__le16 *)
1349                                               mdm->partIdent.identSuffix)[0])));
1350                                 udf_debug("Metadata part num=%d\n",
1351                                         le16_to_cpu(mdm->partitionNum));
1352                                 udf_debug("Metadata part alloc unit size=%d\n",
1353                                         le32_to_cpu(mdm->allocUnitSize));
1354                                 udf_debug("Metadata file loc=%d\n",
1355                                         le32_to_cpu(mdm->metadataFileLoc));
1356                                 udf_debug("Mirror file loc=%d\n",
1357                                        le32_to_cpu(mdm->metadataMirrorFileLoc));
1358                                 udf_debug("Bitmap file loc=%d\n",
1359                                        le32_to_cpu(mdm->metadataBitmapFileLoc));
1360                                 udf_debug("Duplicate Flag: %d %d\n",
1361                                         mdata->s_dup_md_flag, mdm->flags);
1362                         } else {
1363                                 udf_debug("Unknown ident: %s\n",
1364                                           upm2->partIdent.ident);
1365                                 continue;
1366                         }
1367                         map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1368                         map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1369                 }
1370                 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1371                           i, map->s_partition_num, type,
1372                           map->s_volumeseqnum);
1373         }
1374
1375         if (fileset) {
1376                 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
1377
1378                 *fileset = lelb_to_cpu(la->extLocation);
1379                 udf_debug("FileSet found in LogicalVolDesc at block=%d, "
1380                           "partition=%d\n", fileset->logicalBlockNum,
1381                           fileset->partitionReferenceNum);
1382         }
1383         if (lvd->integritySeqExt.extLength)
1384                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1385
1386 out_bh:
1387         brelse(bh);
1388         return ret;
1389 }
1390
1391 /*
1392  * udf_load_logicalvolint
1393  *
1394  */
1395 static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
1396 {
1397         struct buffer_head *bh = NULL;
1398         uint16_t ident;
1399         struct udf_sb_info *sbi = UDF_SB(sb);
1400         struct logicalVolIntegrityDesc *lvid;
1401
1402         while (loc.extLength > 0 &&
1403                (bh = udf_read_tagged(sb, loc.extLocation,
1404                                      loc.extLocation, &ident)) &&
1405                ident == TAG_IDENT_LVID) {
1406                 sbi->s_lvid_bh = bh;
1407                 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1408
1409                 if (lvid->nextIntegrityExt.extLength)
1410                         udf_load_logicalvolint(sb,
1411                                 leea_to_cpu(lvid->nextIntegrityExt));
1412
1413                 if (sbi->s_lvid_bh != bh)
1414                         brelse(bh);
1415                 loc.extLength -= sb->s_blocksize;
1416                 loc.extLocation++;
1417         }
1418         if (sbi->s_lvid_bh != bh)
1419                 brelse(bh);
1420 }
1421
1422 /*
1423  * udf_process_sequence
1424  *
1425  * PURPOSE
1426  *      Process a main/reserve volume descriptor sequence.
1427  *
1428  * PRE-CONDITIONS
1429  *      sb                      Pointer to _locked_ superblock.
1430  *      block                   First block of first extent of the sequence.
1431  *      lastblock               Lastblock of first extent of the sequence.
1432  *
1433  * HISTORY
1434  *      July 1, 1997 - Andrew E. Mileski
1435  *      Written, tested, and released.
1436  */
1437 static noinline int udf_process_sequence(struct super_block *sb, long block,
1438                                 long lastblock, struct kernel_lb_addr *fileset)
1439 {
1440         struct buffer_head *bh = NULL;
1441         struct udf_vds_record vds[VDS_POS_LENGTH];
1442         struct udf_vds_record *curr;
1443         struct generic_desc *gd;
1444         struct volDescPtr *vdp;
1445         int done = 0;
1446         uint32_t vdsn;
1447         uint16_t ident;
1448         long next_s = 0, next_e = 0;
1449
1450         memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1451
1452         /*
1453          * Read the main descriptor sequence and find which descriptors
1454          * are in it.
1455          */
1456         for (; (!done && block <= lastblock); block++) {
1457
1458                 bh = udf_read_tagged(sb, block, block, &ident);
1459                 if (!bh) {
1460                         printk(KERN_ERR "udf: Block %Lu of volume descriptor "
1461                                "sequence is corrupted or we could not read "
1462                                "it.\n", (unsigned long long)block);
1463                         return 1;
1464                 }
1465
1466                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1467                 gd = (struct generic_desc *)bh->b_data;
1468                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1469                 switch (ident) {
1470                 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1471                         curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1472                         if (vdsn >= curr->volDescSeqNum) {
1473                                 curr->volDescSeqNum = vdsn;
1474                                 curr->block = block;
1475                         }
1476                         break;
1477                 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1478                         curr = &vds[VDS_POS_VOL_DESC_PTR];
1479                         if (vdsn >= curr->volDescSeqNum) {
1480                                 curr->volDescSeqNum = vdsn;
1481                                 curr->block = block;
1482
1483                                 vdp = (struct volDescPtr *)bh->b_data;
1484                                 next_s = le32_to_cpu(
1485                                         vdp->nextVolDescSeqExt.extLocation);
1486                                 next_e = le32_to_cpu(
1487                                         vdp->nextVolDescSeqExt.extLength);
1488                                 next_e = next_e >> sb->s_blocksize_bits;
1489                                 next_e += next_s;
1490                         }
1491                         break;
1492                 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1493                         curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1494                         if (vdsn >= curr->volDescSeqNum) {
1495                                 curr->volDescSeqNum = vdsn;
1496                                 curr->block = block;
1497                         }
1498                         break;
1499                 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1500                         curr = &vds[VDS_POS_PARTITION_DESC];
1501                         if (!curr->block)
1502                                 curr->block = block;
1503                         break;
1504                 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1505                         curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1506                         if (vdsn >= curr->volDescSeqNum) {
1507                                 curr->volDescSeqNum = vdsn;
1508                                 curr->block = block;
1509                         }
1510                         break;
1511                 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1512                         curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1513                         if (vdsn >= curr->volDescSeqNum) {
1514                                 curr->volDescSeqNum = vdsn;
1515                                 curr->block = block;
1516                         }
1517                         break;
1518                 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1519                         vds[VDS_POS_TERMINATING_DESC].block = block;
1520                         if (next_e) {
1521                                 block = next_s;
1522                                 lastblock = next_e;
1523                                 next_s = next_e = 0;
1524                         } else
1525                                 done = 1;
1526                         break;
1527                 }
1528                 brelse(bh);
1529         }
1530         /*
1531          * Now read interesting descriptors again and process them
1532          * in a suitable order
1533          */
1534         if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1535                 printk(KERN_ERR "udf: Primary Volume Descriptor not found!\n");
1536                 return 1;
1537         }
1538         if (udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block))
1539                 return 1;
1540
1541         if (vds[VDS_POS_LOGICAL_VOL_DESC].block && udf_load_logicalvol(sb,
1542             vds[VDS_POS_LOGICAL_VOL_DESC].block, fileset))
1543                 return 1;
1544
1545         if (vds[VDS_POS_PARTITION_DESC].block) {
1546                 /*
1547                  * We rescan the whole descriptor sequence to find
1548                  * partition descriptor blocks and process them.
1549                  */
1550                 for (block = vds[VDS_POS_PARTITION_DESC].block;
1551                      block < vds[VDS_POS_TERMINATING_DESC].block;
1552                      block++)
1553                         if (udf_load_partdesc(sb, block))
1554                                 return 1;
1555         }
1556
1557         return 0;
1558 }
1559
1560 static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh,
1561                              struct kernel_lb_addr *fileset)
1562 {
1563         struct anchorVolDescPtr *anchor;
1564         long main_s, main_e, reserve_s, reserve_e;
1565         struct udf_sb_info *sbi;
1566
1567         sbi = UDF_SB(sb);
1568         anchor = (struct anchorVolDescPtr *)bh->b_data;
1569
1570         /* Locate the main sequence */
1571         main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1572         main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1573         main_e = main_e >> sb->s_blocksize_bits;
1574         main_e += main_s;
1575
1576         /* Locate the reserve sequence */
1577         reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1578         reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1579         reserve_e = reserve_e >> sb->s_blocksize_bits;
1580         reserve_e += reserve_s;
1581
1582         /* Process the main & reserve sequences */
1583         /* responsible for finding the PartitionDesc(s) */
1584         if (!udf_process_sequence(sb, main_s, main_e, fileset))
1585                 return 1;
1586         return !udf_process_sequence(sb, reserve_s, reserve_e, fileset);
1587 }
1588
1589 /*
1590  * Check whether there is an anchor block in the given block and
1591  * load Volume Descriptor Sequence if so.
1592  */
1593 static int udf_check_anchor_block(struct super_block *sb, sector_t block,
1594                                   struct kernel_lb_addr *fileset)
1595 {
1596         struct buffer_head *bh;
1597         uint16_t ident;
1598         int ret;
1599
1600         if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
1601             udf_fixed_to_variable(block) >=
1602             sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits)
1603                 return 0;
1604
1605         bh = udf_read_tagged(sb, block, block, &ident);
1606         if (!bh)
1607                 return 0;
1608         if (ident != TAG_IDENT_AVDP) {
1609                 brelse(bh);
1610                 return 0;
1611         }
1612         ret = udf_load_sequence(sb, bh, fileset);
1613         brelse(bh);
1614         return ret;
1615 }
1616
1617 /* Search for an anchor volume descriptor pointer */
1618 static sector_t udf_scan_anchors(struct super_block *sb, sector_t lastblock,
1619                                  struct kernel_lb_addr *fileset)
1620 {
1621         sector_t last[6];
1622         int i;
1623         struct udf_sb_info *sbi = UDF_SB(sb);
1624         int last_count = 0;
1625
1626         /* First try user provided anchor */
1627         if (sbi->s_anchor) {
1628                 if (udf_check_anchor_block(sb, sbi->s_anchor, fileset))
1629                         return lastblock;
1630         }
1631         /*
1632          * according to spec, anchor is in either:
1633          *     block 256
1634          *     lastblock-256
1635          *     lastblock
1636          *  however, if the disc isn't closed, it could be 512.
1637          */
1638         if (udf_check_anchor_block(sb, sbi->s_session + 256, fileset))
1639                 return lastblock;
1640         /*
1641          * The trouble is which block is the last one. Drives often misreport
1642          * this so we try various possibilities.
1643          */
1644         last[last_count++] = lastblock;
1645         if (lastblock >= 1)
1646                 last[last_count++] = lastblock - 1;
1647         last[last_count++] = lastblock + 1;
1648         if (lastblock >= 2)
1649                 last[last_count++] = lastblock - 2;
1650         if (lastblock >= 150)
1651                 last[last_count++] = lastblock - 150;
1652         if (lastblock >= 152)
1653                 last[last_count++] = lastblock - 152;
1654
1655         for (i = 0; i < last_count; i++) {
1656                 if (last[i] >= sb->s_bdev->bd_inode->i_size >>
1657                                 sb->s_blocksize_bits)
1658                         continue;
1659                 if (udf_check_anchor_block(sb, last[i], fileset))
1660                         return last[i];
1661                 if (last[i] < 256)
1662                         continue;
1663                 if (udf_check_anchor_block(sb, last[i] - 256, fileset))
1664                         return last[i];
1665         }
1666
1667         /* Finally try block 512 in case media is open */
1668         if (udf_check_anchor_block(sb, sbi->s_session + 512, fileset))
1669                 return last[0];
1670         return 0;
1671 }
1672
1673 /*
1674  * Find an anchor volume descriptor and load Volume Descriptor Sequence from
1675  * area specified by it. The function expects sbi->s_lastblock to be the last
1676  * block on the media.
1677  *
1678  * Return 1 if ok, 0 if not found.
1679  *
1680  */
1681 static int udf_find_anchor(struct super_block *sb,
1682                            struct kernel_lb_addr *fileset)
1683 {
1684         sector_t lastblock;
1685         struct udf_sb_info *sbi = UDF_SB(sb);
1686
1687         lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1688         if (lastblock)
1689                 goto out;
1690
1691         /* No anchor found? Try VARCONV conversion of block numbers */
1692         UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
1693         /* Firstly, we try to not convert number of the last block */
1694         lastblock = udf_scan_anchors(sb,
1695                                 udf_variable_to_fixed(sbi->s_last_block),
1696                                 fileset);
1697         if (lastblock)
1698                 goto out;
1699
1700         /* Secondly, we try with converted number of the last block */
1701         lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1702         if (!lastblock) {
1703                 /* VARCONV didn't help. Clear it. */
1704                 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
1705                 return 0;
1706         }
1707 out:
1708         sbi->s_last_block = lastblock;
1709         return 1;
1710 }
1711
1712 /*
1713  * Check Volume Structure Descriptor, find Anchor block and load Volume
1714  * Descriptor Sequence
1715  */
1716 static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
1717                         int silent, struct kernel_lb_addr *fileset)
1718 {
1719         struct udf_sb_info *sbi = UDF_SB(sb);
1720         loff_t nsr_off;
1721
1722         if (!sb_set_blocksize(sb, uopt->blocksize)) {
1723                 if (!silent)
1724                         printk(KERN_WARNING "UDF-fs: Bad block size\n");
1725                 return 0;
1726         }
1727         sbi->s_last_block = uopt->lastblock;
1728         if (!uopt->novrs) {
1729                 /* Check that it is NSR02 compliant */
1730                 nsr_off = udf_check_vsd(sb);
1731                 if (!nsr_off) {
1732                         if (!silent)
1733                                 printk(KERN_WARNING "UDF-fs: No VRS found\n");
1734                         return 0;
1735                 }
1736                 if (nsr_off == -1)
1737                         udf_debug("Failed to read byte 32768. Assuming open "
1738                                   "disc. Skipping validity check\n");
1739                 if (!sbi->s_last_block)
1740                         sbi->s_last_block = udf_get_last_block(sb);
1741         } else {
1742                 udf_debug("Validity check skipped because of novrs option\n");
1743         }
1744
1745         /* Look for anchor block and load Volume Descriptor Sequence */
1746         sbi->s_anchor = uopt->anchor;
1747         if (!udf_find_anchor(sb, fileset)) {
1748                 if (!silent)
1749                         printk(KERN_WARNING "UDF-fs: No anchor found\n");
1750                 return 0;
1751         }
1752         return 1;
1753 }
1754
1755 static void udf_open_lvid(struct super_block *sb)
1756 {
1757         struct udf_sb_info *sbi = UDF_SB(sb);
1758         struct buffer_head *bh = sbi->s_lvid_bh;
1759         struct logicalVolIntegrityDesc *lvid;
1760         struct logicalVolIntegrityDescImpUse *lvidiu;
1761
1762         if (!bh)
1763                 return;
1764         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1765         lvidiu = udf_sb_lvidiu(sbi);
1766
1767         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1768         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1769         udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
1770                                 CURRENT_TIME);
1771         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN);
1772
1773         lvid->descTag.descCRC = cpu_to_le16(
1774                 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1775                         le16_to_cpu(lvid->descTag.descCRCLength)));
1776
1777         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1778         mark_buffer_dirty(bh);
1779         sbi->s_lvid_dirty = 0;
1780 }
1781
1782 static void udf_close_lvid(struct super_block *sb)
1783 {
1784         struct udf_sb_info *sbi = UDF_SB(sb);
1785         struct buffer_head *bh = sbi->s_lvid_bh;
1786         struct logicalVolIntegrityDesc *lvid;
1787         struct logicalVolIntegrityDescImpUse *lvidiu;
1788
1789         if (!bh)
1790                 return;
1791
1792         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1793         lvidiu = udf_sb_lvidiu(sbi);
1794         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1795         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1796         udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
1797         if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1798                 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1799         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1800                 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1801         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
1802                 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
1803         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1804
1805         lvid->descTag.descCRC = cpu_to_le16(
1806                         crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1807                                 le16_to_cpu(lvid->descTag.descCRCLength)));
1808
1809         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1810         mark_buffer_dirty(bh);
1811         sbi->s_lvid_dirty = 0;
1812 }
1813
1814 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
1815 {
1816         int i;
1817         int nr_groups = bitmap->s_nr_groups;
1818         int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
1819                                                 nr_groups);
1820
1821         for (i = 0; i < nr_groups; i++)
1822                 if (bitmap->s_block_bitmap[i])
1823                         brelse(bitmap->s_block_bitmap[i]);
1824
1825         if (size <= PAGE_SIZE)
1826                 kfree(bitmap);
1827         else
1828                 vfree(bitmap);
1829 }
1830
1831 static void udf_free_partition(struct udf_part_map *map)
1832 {
1833         int i;
1834         struct udf_meta_data *mdata;
1835
1836         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1837                 iput(map->s_uspace.s_table);
1838         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1839                 iput(map->s_fspace.s_table);
1840         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1841                 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
1842         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1843                 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
1844         if (map->s_partition_type == UDF_SPARABLE_MAP15)
1845                 for (i = 0; i < 4; i++)
1846                         brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
1847         else if (map->s_partition_type == UDF_METADATA_MAP25) {
1848                 mdata = &map->s_type_specific.s_metadata;
1849                 iput(mdata->s_metadata_fe);
1850                 mdata->s_metadata_fe = NULL;
1851
1852                 iput(mdata->s_mirror_fe);
1853                 mdata->s_mirror_fe = NULL;
1854
1855                 iput(mdata->s_bitmap_fe);
1856                 mdata->s_bitmap_fe = NULL;
1857         }
1858 }
1859
1860 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1861 {
1862         int i;
1863         int ret;
1864         struct inode *inode = NULL;
1865         struct udf_options uopt;
1866         struct kernel_lb_addr rootdir, fileset;
1867         struct udf_sb_info *sbi;
1868
1869         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1870         uopt.uid = -1;
1871         uopt.gid = -1;
1872         uopt.umask = 0;
1873         uopt.fmode = UDF_INVALID_MODE;
1874         uopt.dmode = UDF_INVALID_MODE;
1875
1876         sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1877         if (!sbi)
1878                 return -ENOMEM;
1879
1880         sb->s_fs_info = sbi;
1881
1882         mutex_init(&sbi->s_alloc_mutex);
1883
1884         if (!udf_parse_options((char *)options, &uopt, false))
1885                 goto error_out;
1886
1887         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1888             uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
1889                 udf_error(sb, "udf_read_super",
1890                           "utf8 cannot be combined with iocharset\n");
1891                 goto error_out;
1892         }
1893 #ifdef CONFIG_UDF_NLS
1894         if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1895                 uopt.nls_map = load_nls_default();
1896                 if (!uopt.nls_map)
1897                         uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1898                 else
1899                         udf_debug("Using default NLS map\n");
1900         }
1901 #endif
1902         if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1903                 uopt.flags |= (1 << UDF_FLAG_UTF8);
1904
1905         fileset.logicalBlockNum = 0xFFFFFFFF;
1906         fileset.partitionReferenceNum = 0xFFFF;
1907
1908         sbi->s_flags = uopt.flags;
1909         sbi->s_uid = uopt.uid;
1910         sbi->s_gid = uopt.gid;
1911         sbi->s_umask = uopt.umask;
1912         sbi->s_fmode = uopt.fmode;
1913         sbi->s_dmode = uopt.dmode;
1914         sbi->s_nls_map = uopt.nls_map;
1915
1916         if (uopt.session == 0xFFFFFFFF)
1917                 sbi->s_session = udf_get_last_session(sb);
1918         else
1919                 sbi->s_session = uopt.session;
1920
1921         udf_debug("Multi-session=%d\n", sbi->s_session);
1922
1923         /* Fill in the rest of the superblock */
1924         sb->s_op = &udf_sb_ops;
1925         sb->s_export_op = &udf_export_ops;
1926         sb->dq_op = NULL;
1927         sb->s_dirt = 0;
1928         sb->s_magic = UDF_SUPER_MAGIC;
1929         sb->s_time_gran = 1000;
1930
1931         if (uopt.flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) {
1932                 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1933         } else {
1934                 uopt.blocksize = bdev_logical_block_size(sb->s_bdev);
1935                 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1936                 if (!ret && uopt.blocksize != UDF_DEFAULT_BLOCKSIZE) {
1937                         if (!silent)
1938                                 printk(KERN_NOTICE
1939                                        "UDF-fs: Rescanning with blocksize "
1940                                        "%d\n", UDF_DEFAULT_BLOCKSIZE);
1941                         uopt.blocksize = UDF_DEFAULT_BLOCKSIZE;
1942                         ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1943                 }
1944         }
1945         if (!ret) {
1946                 printk(KERN_WARNING "UDF-fs: No partition found (1)\n");
1947                 goto error_out;
1948         }
1949
1950         udf_debug("Lastblock=%d\n", sbi->s_last_block);
1951
1952         if (sbi->s_lvid_bh) {
1953                 struct logicalVolIntegrityDescImpUse *lvidiu =
1954                                                         udf_sb_lvidiu(sbi);
1955                 uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
1956                 uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
1957                 /* uint16_t maxUDFWriteRev =
1958                                 le16_to_cpu(lvidiu->maxUDFWriteRev); */
1959
1960                 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
1961                         printk(KERN_ERR "UDF-fs: minUDFReadRev=%x "
1962                                         "(max is %x)\n",
1963                                le16_to_cpu(lvidiu->minUDFReadRev),
1964                                UDF_MAX_READ_VERSION);
1965                         goto error_out;
1966                 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
1967                         sb->s_flags |= MS_RDONLY;
1968
1969                 sbi->s_udfrev = minUDFWriteRev;
1970
1971                 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1972                         UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
1973                 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
1974                         UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
1975         }
1976
1977         if (!sbi->s_partitions) {
1978                 printk(KERN_WARNING "UDF-fs: No partition found (2)\n");
1979                 goto error_out;
1980         }
1981
1982         if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
1983                         UDF_PART_FLAG_READ_ONLY) {
1984                 printk(KERN_NOTICE "UDF-fs: Partition marked readonly; "
1985                                    "forcing readonly mount\n");
1986                 sb->s_flags |= MS_RDONLY;
1987         }
1988
1989         if (udf_find_fileset(sb, &fileset, &rootdir)) {
1990                 printk(KERN_WARNING "UDF-fs: No fileset found\n");
1991                 goto error_out;
1992         }
1993
1994         if (!silent) {
1995                 struct timestamp ts;
1996                 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
1997                 udf_info("UDF: Mounting volume '%s', "
1998                          "timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
1999                          sbi->s_volume_ident, le16_to_cpu(ts.year), ts.month, ts.day,
2000                          ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
2001         }
2002         if (!(sb->s_flags & MS_RDONLY))
2003                 udf_open_lvid(sb);
2004
2005         /* Assign the root inode */
2006         /* assign inodes by physical block number */
2007         /* perhaps it's not extensible enough, but for now ... */
2008         inode = udf_iget(sb, &rootdir);
2009         if (!inode) {
2010                 printk(KERN_ERR "UDF-fs: Error in udf_iget, block=%d, "
2011                                 "partition=%d\n",
2012                        rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
2013                 goto error_out;
2014         }
2015
2016         /* Allocate a dentry for the root inode */
2017         sb->s_root = d_alloc_root(inode);
2018         if (!sb->s_root) {
2019                 printk(KERN_ERR "UDF-fs: Couldn't allocate root dentry\n");
2020                 iput(inode);
2021                 goto error_out;
2022         }
2023         sb->s_maxbytes = MAX_LFS_FILESIZE;
2024         return 0;
2025
2026 error_out:
2027         if (sbi->s_vat_inode)
2028                 iput(sbi->s_vat_inode);
2029         if (sbi->s_partitions)
2030                 for (i = 0; i < sbi->s_partitions; i++)
2031                         udf_free_partition(&sbi->s_partmaps[i]);
2032 #ifdef CONFIG_UDF_NLS
2033         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2034                 unload_nls(sbi->s_nls_map);
2035 #endif
2036         if (!(sb->s_flags & MS_RDONLY))
2037                 udf_close_lvid(sb);
2038         brelse(sbi->s_lvid_bh);
2039
2040         kfree(sbi->s_partmaps);
2041         kfree(sbi);
2042         sb->s_fs_info = NULL;
2043
2044         return -EINVAL;
2045 }
2046
2047 static void udf_error(struct super_block *sb, const char *function,
2048                       const char *fmt, ...)
2049 {
2050         va_list args;
2051
2052         if (!(sb->s_flags & MS_RDONLY)) {
2053                 /* mark sb error */
2054                 sb->s_dirt = 1;
2055         }
2056         va_start(args, fmt);
2057         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2058         va_end(args);
2059         printk(KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
2060                 sb->s_id, function, error_buf);
2061 }
2062
2063 void udf_warning(struct super_block *sb, const char *function,
2064                  const char *fmt, ...)
2065 {
2066         va_list args;
2067
2068         va_start(args, fmt);
2069         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2070         va_end(args);
2071         printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
2072                sb->s_id, function, error_buf);
2073 }
2074
2075 static void udf_put_super(struct super_block *sb)
2076 {
2077         int i;
2078         struct udf_sb_info *sbi;
2079
2080         sbi = UDF_SB(sb);
2081
2082         lock_kernel();
2083
2084         if (sbi->s_vat_inode)
2085                 iput(sbi->s_vat_inode);
2086         if (sbi->s_partitions)
2087                 for (i = 0; i < sbi->s_partitions; i++)
2088                         udf_free_partition(&sbi->s_partmaps[i]);
2089 #ifdef CONFIG_UDF_NLS
2090         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2091                 unload_nls(sbi->s_nls_map);
2092 #endif
2093         if (!(sb->s_flags & MS_RDONLY))
2094                 udf_close_lvid(sb);
2095         brelse(sbi->s_lvid_bh);
2096         kfree(sbi->s_partmaps);
2097         kfree(sb->s_fs_info);
2098         sb->s_fs_info = NULL;
2099
2100         unlock_kernel();
2101 }
2102
2103 static int udf_sync_fs(struct super_block *sb, int wait)
2104 {
2105         struct udf_sb_info *sbi = UDF_SB(sb);
2106
2107         mutex_lock(&sbi->s_alloc_mutex);
2108         if (sbi->s_lvid_dirty) {
2109                 /*
2110                  * Blockdevice will be synced later so we don't have to submit
2111                  * the buffer for IO
2112                  */
2113                 mark_buffer_dirty(sbi->s_lvid_bh);
2114                 sb->s_dirt = 0;
2115                 sbi->s_lvid_dirty = 0;
2116         }
2117         mutex_unlock(&sbi->s_alloc_mutex);
2118
2119         return 0;
2120 }
2121
2122 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
2123 {
2124         struct super_block *sb = dentry->d_sb;
2125         struct udf_sb_info *sbi = UDF_SB(sb);
2126         struct logicalVolIntegrityDescImpUse *lvidiu;
2127         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
2128
2129         if (sbi->s_lvid_bh != NULL)
2130                 lvidiu = udf_sb_lvidiu(sbi);
2131         else
2132                 lvidiu = NULL;
2133
2134         buf->f_type = UDF_SUPER_MAGIC;
2135         buf->f_bsize = sb->s_blocksize;
2136         buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
2137         buf->f_bfree = udf_count_free(sb);
2138         buf->f_bavail = buf->f_bfree;
2139         buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2140                                           le32_to_cpu(lvidiu->numDirs)) : 0)
2141                         + buf->f_bfree;
2142         buf->f_ffree = buf->f_bfree;
2143         buf->f_namelen = UDF_NAME_LEN - 2;
2144         buf->f_fsid.val[0] = (u32)id;
2145         buf->f_fsid.val[1] = (u32)(id >> 32);
2146
2147         return 0;
2148 }
2149
2150 static unsigned int udf_count_free_bitmap(struct super_block *sb,
2151                                           struct udf_bitmap *bitmap)
2152 {
2153         struct buffer_head *bh = NULL;
2154         unsigned int accum = 0;
2155         int index;
2156         int block = 0, newblock;
2157         struct kernel_lb_addr loc;
2158         uint32_t bytes;
2159         uint8_t *ptr;
2160         uint16_t ident;
2161         struct spaceBitmapDesc *bm;
2162
2163         lock_kernel();
2164
2165         loc.logicalBlockNum = bitmap->s_extPosition;
2166         loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
2167         bh = udf_read_ptagged(sb, &loc, 0, &ident);
2168
2169         if (!bh) {
2170                 printk(KERN_ERR "udf: udf_count_free failed\n");
2171                 goto out;
2172         } else if (ident != TAG_IDENT_SBD) {
2173                 brelse(bh);
2174                 printk(KERN_ERR "udf: udf_count_free failed\n");
2175                 goto out;
2176         }
2177
2178         bm = (struct spaceBitmapDesc *)bh->b_data;
2179         bytes = le32_to_cpu(bm->numOfBytes);
2180         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2181         ptr = (uint8_t *)bh->b_data;
2182
2183         while (bytes > 0) {
2184                 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2185                 accum += bitmap_weight((const unsigned long *)(ptr + index),
2186                                         cur_bytes * 8);
2187                 bytes -= cur_bytes;
2188                 if (bytes) {
2189                         brelse(bh);
2190                         newblock = udf_get_lb_pblock(sb, &loc, ++block);
2191                         bh = udf_tread(sb, newblock);
2192                         if (!bh) {
2193                                 udf_debug("read failed\n");
2194                                 goto out;
2195                         }
2196                         index = 0;
2197                         ptr = (uint8_t *)bh->b_data;
2198                 }
2199         }
2200         brelse(bh);
2201
2202 out:
2203         unlock_kernel();
2204
2205         return accum;
2206 }
2207
2208 static unsigned int udf_count_free_table(struct super_block *sb,
2209                                          struct inode *table)
2210 {
2211         unsigned int accum = 0;
2212         uint32_t elen;
2213         struct kernel_lb_addr eloc;
2214         int8_t etype;
2215         struct extent_position epos;
2216
2217         lock_kernel();
2218
2219         epos.block = UDF_I(table)->i_location;
2220         epos.offset = sizeof(struct unallocSpaceEntry);
2221         epos.bh = NULL;
2222
2223         while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2224                 accum += (elen >> table->i_sb->s_blocksize_bits);
2225
2226         brelse(epos.bh);
2227
2228         unlock_kernel();
2229
2230         return accum;
2231 }
2232
2233 static unsigned int udf_count_free(struct super_block *sb)
2234 {
2235         unsigned int accum = 0;
2236         struct udf_sb_info *sbi;
2237         struct udf_part_map *map;
2238
2239         sbi = UDF_SB(sb);
2240         if (sbi->s_lvid_bh) {
2241                 struct logicalVolIntegrityDesc *lvid =
2242                         (struct logicalVolIntegrityDesc *)
2243                         sbi->s_lvid_bh->b_data;
2244                 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
2245                         accum = le32_to_cpu(
2246                                         lvid->freeSpaceTable[sbi->s_partition]);
2247                         if (accum == 0xFFFFFFFF)
2248                                 accum = 0;
2249                 }
2250         }
2251
2252         if (accum)
2253                 return accum;
2254
2255         map = &sbi->s_partmaps[sbi->s_partition];
2256         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2257                 accum += udf_count_free_bitmap(sb,
2258                                                map->s_uspace.s_bitmap);
2259         }
2260         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
2261                 accum += udf_count_free_bitmap(sb,
2262                                                map->s_fspace.s_bitmap);
2263         }
2264         if (accum)
2265                 return accum;
2266
2267         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2268                 accum += udf_count_free_table(sb,
2269                                               map->s_uspace.s_table);
2270         }
2271         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
2272                 accum += udf_count_free_table(sb,
2273                                               map->s_fspace.s_table);
2274         }
2275
2276         return accum;
2277 }