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/quotaops.h>
  58 #include <linux/seq_file.h>
  59 #include <linux/bitmap.h>
  60 #include <linux/crc-itu-t.h>
  61 #include <asm/byteorder.h>
  62
  63 #include "udf_sb.h"
  64 #include "udf_i.h"
  65
  66 #include <linux/init.h>
  67 #include <asm/uaccess.h>
  68
  69 #define VDS_POS_PRIMARY_VOL_DESC        0
  70 #define VDS_POS_UNALLOC_SPACE_DESC      1
  71 #define VDS_POS_LOGICAL_VOL_DESC        2
  72 #define VDS_POS_PARTITION_DESC          3
  73 #define VDS_POS_IMP_USE_VOL_DESC        4
  74 #define VDS_POS_VOL_DESC_PTR            5
  75 #define VDS_POS_TERMINATING_DESC        6
  76 #define VDS_POS_LENGTH                  7
  77
  78 #define UDF_DEFAULT_BLOCKSIZE 2048
  79
  80 static char error_buf[1024];
  81
  82 /* These are the "meat" - everything else is stuffing */
  83 static int udf_fill_super(struct super_block *, void *, int);
  84 static void udf_put_super(struct super_block *);
  85 static int udf_sync_fs(struct super_block *, int);
  86 static int udf_remount_fs(struct super_block *, int *, char *);
  87 static void udf_load_logicalvolint(struct super_block *, struct kernel_extent_ad);
  88 static int udf_find_fileset(struct super_block *, struct kernel_lb_addr *,
  89                             struct kernel_lb_addr *);
  90 static void udf_load_fileset(struct super_block *, struct buffer_head *,
  91                              struct kernel_lb_addr *);
  92 static void udf_open_lvid(struct super_block *);
  93 static void udf_close_lvid(struct super_block *);
  94 static unsigned int udf_count_free(struct super_block *);
  95 static int udf_statfs(struct dentry *, struct kstatfs *);
  96 static int udf_show_options(struct seq_file *, struct vfsmount *);
  97 static void udf_error(struct super_block *sb, const char *function,
  98                       const char *fmt, ...);
  99
 100 struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct udf_sb_info *sbi)
 101 {
 102         struct logicalVolIntegrityDesc *lvid =
 103                 (struct logicalVolIntegrityDesc *)sbi->s_lvid_bh->b_data;
 104         __u32 number_of_partitions = le32_to_cpu(lvid->numOfPartitions);
 105         __u32 offset = number_of_partitions * 2 *
 106                                 sizeof(uint32_t)/sizeof(uint8_t);
 107         return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
 108 }
 109
 110 /* UDF filesystem type */
 111 static int udf_get_sb(struct file_system_type *fs_type,
 112                       int flags, const char *dev_name, void *data,
 113                       struct vfsmount *mnt)
 114 {
 115         return get_sb_bdev(fs_type, flags, dev_name, data, udf_fill_super, mnt);
 116 }
 117
 118 static struct file_system_type udf_fstype = {
 119         .owner          = THIS_MODULE,
 120         .name           = "udf",
 121         .get_sb         = udf_get_sb,
 122         .kill_sb        = kill_block_super,
 123         .fs_flags       = FS_REQUIRES_DEV,
 124 };
 125
 126 static struct kmem_cache *udf_inode_cachep;
 127
 128 static struct inode *udf_alloc_inode(struct super_block *sb)
 129 {
 130         struct udf_inode_info *ei;
 131         ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
 132         if (!ei)
 133                 return NULL;
 134
 135         ei->i_unique = 0;
 136         ei->i_lenExtents = 0;
 137         ei->i_next_alloc_block = 0;
 138         ei->i_next_alloc_goal = 0;
 139         ei->i_strat4096 = 0;
 140
 141         return &ei->vfs_inode;
 142 }
 143
 144 static void udf_destroy_inode(struct inode *inode)
 145 {
 146         kmem_cache_free(udf_inode_cachep, UDF_I(inode));
 147 }
 148
 149 static void init_once(void *foo)
 150 {
 151         struct udf_inode_info *ei = (struct udf_inode_info *)foo;
 152
 153         ei->i_ext.i_data = NULL;
 154         inode_init_once(&ei->vfs_inode);
 155 }
 156
 157 static int init_inodecache(void)
 158 {
 159         udf_inode_cachep = kmem_cache_create("udf_inode_cache",
 160                                              sizeof(struct udf_inode_info),
 161                                              0, (SLAB_RECLAIM_ACCOUNT |
 162                                                  SLAB_MEM_SPREAD),
 163                                              init_once);
 164         if (!udf_inode_cachep)
 165                 return -ENOMEM;
 166         return 0;
 167 }
 168
 169 static void destroy_inodecache(void)
 170 {
 171         kmem_cache_destroy(udf_inode_cachep);
 172 }
 173
 174 /* Superblock operations */
 175 static const struct super_operations udf_sb_ops = {
 176         .alloc_inode    = udf_alloc_inode,
 177         .destroy_inode  = udf_destroy_inode,
 178         .write_inode    = udf_write_inode,
 179         .delete_inode   = udf_delete_inode,
 180         .clear_inode    = udf_clear_inode,
 181         .put_super      = udf_put_super,
 182         .sync_fs        = udf_sync_fs,
 183         .statfs         = udf_statfs,
 184         .remount_fs     = udf_remount_fs,
 185         .show_options   = udf_show_options,
 186 };
 187
 188 struct udf_options {
 189         unsigned char novrs;
 190         unsigned int blocksize;
 191         unsigned int session;
 192         unsigned int lastblock;
 193         unsigned int anchor;
 194         unsigned int volume;
 195         unsigned short partition;
 196         unsigned int fileset;
 197         unsigned int rootdir;
 198         unsigned int flags;
 199         mode_t umask;
 200         gid_t gid;
 201         uid_t uid;
 202         mode_t fmode;
 203         mode_t dmode;
 204         struct nls_table *nls_map;
 205 };
 206
 207 static int __init init_udf_fs(void)
 208 {
 209         int err;
 210
 211         err = init_inodecache();
 212         if (err)
 213                 goto out1;
 214         err = register_filesystem(&udf_fstype);
 215         if (err)
 216                 goto out;
 217
 218         return 0;
 219
 220 out:
 221         destroy_inodecache();
 222
 223 out1:
 224         return err;
 225 }
 226
 227 static void __exit exit_udf_fs(void)
 228 {
 229         unregister_filesystem(&udf_fstype);
 230         destroy_inodecache();
 231 }
 232
 233 module_init(init_udf_fs)
 234 module_exit(exit_udf_fs)
 235
 236 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
 237 {
 238         struct udf_sb_info *sbi = UDF_SB(sb);
 239
 240         sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map),
 241                                   GFP_KERNEL);
 242         if (!sbi->s_partmaps) {
 243                 udf_error(sb, __func__,
 244                           "Unable to allocate space for %d partition maps",
 245                           count);
 246                 sbi->s_partitions = 0;
 247                 return -ENOMEM;
 248         }
 249
 250         sbi->s_partitions = count;
 251         return 0;
 252 }
 253
 254 static int udf_show_options(struct seq_file *seq, struct vfsmount *mnt)
 255 {
 256         struct super_block *sb = mnt->mnt_sb;
 257         struct udf_sb_info *sbi = UDF_SB(sb);
 258
 259         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
 260                 seq_puts(seq, ",nostrict");
 261         if (UDF_QUERY_FLAG(sb, UDF_FLAG_BLOCKSIZE_SET))
 262                 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
 263         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
 264                 seq_puts(seq, ",unhide");
 265         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
 266                 seq_puts(seq, ",undelete");
 267         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
 268                 seq_puts(seq, ",noadinicb");
 269         if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
 270                 seq_puts(seq, ",shortad");
 271         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
 272                 seq_puts(seq, ",uid=forget");
 273         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_IGNORE))
 274                 seq_puts(seq, ",uid=ignore");
 275         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
 276                 seq_puts(seq, ",gid=forget");
 277         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE))
 278                 seq_puts(seq, ",gid=ignore");
 279         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
 280                 seq_printf(seq, ",uid=%u", sbi->s_uid);
 281         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
 282                 seq_printf(seq, ",gid=%u", sbi->s_gid);
 283         if (sbi->s_umask != 0)
 284                 seq_printf(seq, ",umask=%o", sbi->s_umask);
 285         if (sbi->s_fmode != UDF_INVALID_MODE)
 286                 seq_printf(seq, ",mode=%o", sbi->s_fmode);
 287         if (sbi->s_dmode != UDF_INVALID_MODE)
 288                 seq_printf(seq, ",dmode=%o", sbi->s_dmode);
 289         if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
 290                 seq_printf(seq, ",session=%u", sbi->s_session);
 291         if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
 292                 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
 293         if (sbi->s_anchor != 0)
 294                 seq_printf(seq, ",anchor=%u", sbi->s_anchor);
 295         /*
 296          * volume, partition, fileset and rootdir seem to be ignored
 297          * currently
 298          */
 299         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
 300                 seq_puts(seq, ",utf8");
 301         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
 302                 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
 303
 304         return 0;
 305 }
 306
 307 /*
 308  * udf_parse_options
 309  *
 310  * PURPOSE
 311  *      Parse mount options.
 312  *
 313  * DESCRIPTION
 314  *      The following mount options are supported:
 315  *
 316  *      gid=            Set the default group.
 317  *      umask=          Set the default umask.
 318  *      mode=           Set the default file permissions.
 319  *      dmode=          Set the default directory permissions.
 320  *      uid=            Set the default user.
 321  *      bs=             Set the block size.
 322  *      unhide          Show otherwise hidden files.
 323  *      undelete        Show deleted files in lists.
 324  *      adinicb         Embed data in the inode (default)
 325  *      noadinicb       Don't embed data in the inode
 326  *      shortad         Use short ad's
 327  *      longad          Use long ad's (default)
 328  *      nostrict        Unset strict conformance
 329  *      iocharset=      Set the NLS character set
 330  *
 331  *      The remaining are for debugging and disaster recovery:
 332  *
 333  *      novrs           Skip volume sequence recognition
 334  *
 335  *      The following expect a offset from 0.
 336  *
 337  *      session=        Set the CDROM session (default= last session)
 338  *      anchor=         Override standard anchor location. (default= 256)
 339  *      volume=         Override the VolumeDesc location. (unused)
 340  *      partition=      Override the PartitionDesc location. (unused)
 341  *      lastblock=      Set the last block of the filesystem/
 342  *
 343  *      The following expect a offset from the partition root.
 344  *
 345  *      fileset=        Override the fileset block location. (unused)
 346  *      rootdir=        Override the root directory location. (unused)
 347  *              WARNING: overriding the rootdir to a non-directory may
 348  *              yield highly unpredictable results.
 349  *
 350  * PRE-CONDITIONS
 351  *      options         Pointer to mount options string.
 352  *      uopts           Pointer to mount options variable.
 353  *
 354  * POST-CONDITIONS
 355  *      <return>        1       Mount options parsed okay.
 356  *      <return>        0       Error parsing mount options.
 357  *
 358  * HISTORY
 359  *      July 1, 1997 - Andrew E. Mileski
 360  *      Written, tested, and released.
 361  */
 362
 363 enum {
 364         Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
 365         Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
 366         Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
 367         Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
 368         Opt_rootdir, Opt_utf8, Opt_iocharset,
 369         Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore,
 370         Opt_fmode, Opt_dmode
 371 };
 372
 373 static const match_table_t tokens = {
 374         {Opt_novrs,     "novrs"},
 375         {Opt_nostrict,  "nostrict"},
 376         {Opt_bs,        "bs=%u"},
 377         {Opt_unhide,    "unhide"},
 378         {Opt_undelete,  "undelete"},
 379         {Opt_noadinicb, "noadinicb"},
 380         {Opt_adinicb,   "adinicb"},
 381         {Opt_shortad,   "shortad"},
 382         {Opt_longad,    "longad"},
 383         {Opt_uforget,   "uid=forget"},
 384         {Opt_uignore,   "uid=ignore"},
 385         {Opt_gforget,   "gid=forget"},
 386         {Opt_gignore,   "gid=ignore"},
 387         {Opt_gid,       "gid=%u"},
 388         {Opt_uid,       "uid=%u"},
 389         {Opt_umask,     "umask=%o"},
 390         {Opt_session,   "session=%u"},
 391         {Opt_lastblock, "lastblock=%u"},
 392         {Opt_anchor,    "anchor=%u"},
 393         {Opt_volume,    "volume=%u"},
 394         {Opt_partition, "partition=%u"},
 395         {Opt_fileset,   "fileset=%u"},
 396         {Opt_rootdir,   "rootdir=%u"},
 397         {Opt_utf8,      "utf8"},
 398         {Opt_iocharset, "iocharset=%s"},
 399         {Opt_fmode,     "mode=%o"},
 400         {Opt_dmode,     "dmode=%o"},
 401         {Opt_err,       NULL}
 402 };
 403
 404 static int udf_parse_options(char *options, struct udf_options *uopt,
 405                              bool remount)
 406 {
 407         char *p;
 408         int option;
 409
 410         uopt->novrs = 0;
 411         uopt->partition = 0xFFFF;
 412         uopt->session = 0xFFFFFFFF;
 413         uopt->lastblock = 0;
 414         uopt->anchor = 0;
 415         uopt->volume = 0xFFFFFFFF;
 416         uopt->rootdir = 0xFFFFFFFF;
 417         uopt->fileset = 0xFFFFFFFF;
 418         uopt->nls_map = NULL;
 419
 420         if (!options)
 421                 return 1;
 422
 423         while ((p = strsep(&options, ",")) != NULL) {
 424                 substring_t args[MAX_OPT_ARGS];
 425                 int token;
 426                 if (!*p)
 427                         continue;
 428
 429                 token = match_token(p, tokens, args);
 430                 switch (token) {
 431                 case Opt_novrs:
 432                         uopt->novrs = 1;
 433                         break;
 434                 case Opt_bs:
 435                         if (match_int(&args[0], &option))
 436                                 return 0;
 437                         uopt->blocksize = option;
 438                         uopt->flags |= (1 << UDF_FLAG_BLOCKSIZE_SET);
 439                         break;
 440                 case Opt_unhide:
 441                         uopt->flags |= (1 << UDF_FLAG_UNHIDE);
 442                         break;
 443                 case Opt_undelete:
 444                         uopt->flags |= (1 << UDF_FLAG_UNDELETE);
 445                         break;
 446                 case Opt_noadinicb:
 447                         uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
 448                         break;
 449                 case Opt_adinicb:
 450                         uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
 451                         break;
 452                 case Opt_shortad:
 453                         uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
 454                         break;
 455                 case Opt_longad:
 456                         uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
 457                         break;
 458                 case Opt_gid:
 459                         if (match_int(args, &option))
 460                                 return 0;
 461                         uopt->gid = option;
 462                         uopt->flags |= (1 << UDF_FLAG_GID_SET);
 463                         break;
 464                 case Opt_uid:
 465                         if (match_int(args, &option))
 466                                 return 0;
 467                         uopt->uid = option;
 468                         uopt->flags |= (1 << UDF_FLAG_UID_SET);
 469                         break;
 470                 case Opt_umask:
 471                         if (match_octal(args, &option))
 472                                 return 0;
 473                         uopt->umask = option;
 474                         break;
 475                 case Opt_nostrict:
 476                         uopt->flags &= ~(1 << UDF_FLAG_STRICT);
 477                         break;
 478                 case Opt_session:
 479                         if (match_int(args, &option))
 480                                 return 0;
 481                         uopt->session = option;
 482                         if (!remount)
 483                                 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
 484                         break;
 485                 case Opt_lastblock:
 486                         if (match_int(args, &option))
 487                                 return 0;
 488                         uopt->lastblock = option;
 489                         if (!remount)
 490                                 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
 491                         break;
 492                 case Opt_anchor:
 493                         if (match_int(args, &option))
 494                                 return 0;
 495                         uopt->anchor = option;
 496                         break;
 497                 case Opt_volume:
 498                         if (match_int(args, &option))
 499                                 return 0;
 500                         uopt->volume = option;
 501                         break;
 502                 case Opt_partition:
 503                         if (match_int(args, &option))
 504                                 return 0;
 505                         uopt->partition = option;
 506                         break;
 507                 case Opt_fileset:
 508                         if (match_int(args, &option))
 509                                 return 0;
 510                         uopt->fileset = option;
 511                         break;
 512                 case Opt_rootdir:
 513                         if (match_int(args, &option))
 514                                 return 0;
 515                         uopt->rootdir = option;
 516                         break;
 517                 case Opt_utf8:
 518                         uopt->flags |= (1 << UDF_FLAG_UTF8);
 519                         break;
 520 #ifdef CONFIG_UDF_NLS
 521                 case Opt_iocharset:
 522                         uopt->nls_map = load_nls(args[0].from);
 523                         uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
 524                         break;
 525 #endif
 526                 case Opt_uignore:
 527                         uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
 528                         break;
 529                 case Opt_uforget:
 530                         uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
 531                         break;
 532                 case Opt_gignore:
 533                         uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
 534                         break;
 535                 case Opt_gforget:
 536                         uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
 537                         break;
 538                 case Opt_fmode:
 539                         if (match_octal(args, &option))
 540                                 return 0;
 541                         uopt->fmode = option & 0777;
 542                         break;
 543                 case Opt_dmode:
 544                         if (match_octal(args, &option))
 545                                 return 0;
 546                         uopt->dmode = option & 0777;
 547                         break;
 548                 default:
 549                         printk(KERN_ERR "udf: bad mount option \"%s\" "
 550                                "or missing value\n", p);
 551                         return 0;
 552                 }
 553         }
 554         return 1;
 555 }
 556
 557 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
 558 {
 559         struct udf_options uopt;
 560         struct udf_sb_info *sbi = UDF_SB(sb);
 561         int error = 0;
 562
 563         uopt.flags = sbi->s_flags;
 564         uopt.uid   = sbi->s_uid;
 565         uopt.gid   = sbi->s_gid;
 566         uopt.umask = sbi->s_umask;
 567         uopt.fmode = sbi->s_fmode;
 568         uopt.dmode = sbi->s_dmode;
 569
 570         if (!udf_parse_options(options, &uopt, true))
 571                 return -EINVAL;
 572
 573         lock_kernel();
 574         sbi->s_flags = uopt.flags;
 575         sbi->s_uid   = uopt.uid;
 576         sbi->s_gid   = uopt.gid;
 577         sbi->s_umask = uopt.umask;
 578         sbi->s_fmode = uopt.fmode;
 579         sbi->s_dmode = uopt.dmode;
 580
 581         if (sbi->s_lvid_bh) {
 582                 int write_rev = le16_to_cpu(udf_sb_lvidiu(sbi)->minUDFWriteRev);
 583                 if (write_rev > UDF_MAX_WRITE_VERSION)
 584                         *flags |= MS_RDONLY;
 585         }
 586
 587         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 588                 goto out_unlock;
 589
 590         if (*flags & MS_RDONLY) {
 591                 udf_close_lvid(sb);
 592
 593                 error = vfs_dq_off(sb, 1);
 594                 if (error < 0 && error != -ENOSYS)
 595                         error = -EBUSY;
 596         } else {
 597                 udf_open_lvid(sb);
 598
 599                 /* mark the fs r/w for quota activity */
 600                 sb->s_flags &= ~MS_RDONLY;
 601                 vfs_dq_quota_on_remount(sb);
 602         }
 603
 604 out_unlock:
 605         unlock_kernel();
 606         return error;
 607 }
 608
 609 /* Check Volume Structure Descriptors (ECMA 167 2/9.1) */
 610 /* We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
 611 static loff_t udf_check_vsd(struct super_block *sb)
 612 {
 613         struct volStructDesc *vsd = NULL;
 614         loff_t sector = 32768;
 615         int sectorsize;
 616         struct buffer_head *bh = NULL;
 617         int nsr02 = 0;
 618         int nsr03 = 0;
 619         struct udf_sb_info *sbi;
 620
 621         sbi = UDF_SB(sb);
 622         if (sb->s_blocksize < sizeof(struct volStructDesc))
 623                 sectorsize = sizeof(struct volStructDesc);
 624         else
 625                 sectorsize = sb->s_blocksize;
 626
 627         sector += (sbi->s_session << sb->s_blocksize_bits);
 628
 629         udf_debug("Starting at sector %u (%ld byte sectors)\n",
 630                   (unsigned int)(sector >> sb->s_blocksize_bits),
 631                   sb->s_blocksize);
 632         /* Process the sequence (if applicable) */
 633         for (; !nsr02 && !nsr03; sector += sectorsize) {
 634                 /* Read a block */
 635                 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
 636                 if (!bh)
 637                         break;
 638
 639                 /* Look for ISO  descriptors */
 640                 vsd = (struct volStructDesc *)(bh->b_data +
 641                                               (sector & (sb->s_blocksize - 1)));
 642
 643                 if (vsd->stdIdent[0] == 0) {
 644                         brelse(bh);
 645                         break;
 646                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
 647                                     VSD_STD_ID_LEN)) {
 648                         switch (vsd->structType) {
 649                         case 0:
 650                                 udf_debug("ISO9660 Boot Record found\n");
 651                                 break;
 652                         case 1:
 653                                 udf_debug("ISO9660 Primary Volume Descriptor "
 654                                           "found\n");
 655                                 break;
 656                         case 2:
 657                                 udf_debug("ISO9660 Supplementary Volume "
 658                                           "Descriptor found\n");
 659                                 break;
 660                         case 3:
 661                                 udf_debug("ISO9660 Volume Partition Descriptor "
 662                                           "found\n");
 663                                 break;
 664                         case 255:
 665                                 udf_debug("ISO9660 Volume Descriptor Set "
 666                                           "Terminator found\n");
 667                                 break;
 668                         default:
 669                                 udf_debug("ISO9660 VRS (%u) found\n",
 670                                           vsd->structType);
 671                                 break;
 672                         }
 673                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
 674                                     VSD_STD_ID_LEN))
 675                         ; /* nothing */
 676                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
 677                                     VSD_STD_ID_LEN)) {
 678                         brelse(bh);
 679                         break;
 680                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
 681                                     VSD_STD_ID_LEN))
 682                         nsr02 = sector;
 683                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
 684                                     VSD_STD_ID_LEN))
 685                         nsr03 = sector;
 686                 brelse(bh);
 687         }
 688
 689         if (nsr03)
 690                 return nsr03;
 691         else if (nsr02)
 692                 return nsr02;
 693         else if (sector - (sbi->s_session << sb->s_blocksize_bits) == 32768)
 694                 return -1;
 695         else
 696                 return 0;
 697 }
 698
 699 static int udf_find_fileset(struct super_block *sb,
 700                             struct kernel_lb_addr *fileset,
 701                             struct kernel_lb_addr *root)
 702 {
 703         struct buffer_head *bh = NULL;
 704         long lastblock;
 705         uint16_t ident;
 706         struct udf_sb_info *sbi;
 707
 708         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
 709             fileset->partitionReferenceNum != 0xFFFF) {
 710                 bh = udf_read_ptagged(sb, fileset, 0, &ident);
 711
 712                 if (!bh) {
 713                         return 1;
 714                 } else if (ident != TAG_IDENT_FSD) {
 715                         brelse(bh);
 716                         return 1;
 717                 }
 718
 719         }
 720
 721         sbi = UDF_SB(sb);
 722         if (!bh) {
 723                 /* Search backwards through the partitions */
 724                 struct kernel_lb_addr newfileset;
 725
 726 /* --> cvg: FIXME - is it reasonable? */
 727                 return 1;
 728
 729                 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
 730                      (newfileset.partitionReferenceNum != 0xFFFF &&
 731                       fileset->logicalBlockNum == 0xFFFFFFFF &&
 732                       fileset->partitionReferenceNum == 0xFFFF);
 733                      newfileset.partitionReferenceNum--) {
 734                         lastblock = sbi->s_partmaps
 735                                         [newfileset.partitionReferenceNum]
 736                                                 .s_partition_len;
 737                         newfileset.logicalBlockNum = 0;
 738
 739                         do {
 740                                 bh = udf_read_ptagged(sb, &newfileset, 0,
 741                                                       &ident);
 742                                 if (!bh) {
 743                                         newfileset.logicalBlockNum++;
 744                                         continue;
 745                                 }
 746
 747                                 switch (ident) {
 748                                 case TAG_IDENT_SBD:
 749                                 {
 750                                         struct spaceBitmapDesc *sp;
 751                                         sp = (struct spaceBitmapDesc *)
 752                                                                 bh->b_data;
 753                                         newfileset.logicalBlockNum += 1 +
 754                                                 ((le32_to_cpu(sp->numOfBytes) +
 755                                                   sizeof(struct spaceBitmapDesc)
 756                                                   - 1) >> sb->s_blocksize_bits);
 757                                         brelse(bh);
 758                                         break;
 759                                 }
 760                                 case TAG_IDENT_FSD:
 761                                         *fileset = newfileset;
 762                                         break;
 763                                 default:
 764                                         newfileset.logicalBlockNum++;
 765                                         brelse(bh);
 766                                         bh = NULL;
 767                                         break;
 768                                 }
 769                         } while (newfileset.logicalBlockNum < lastblock &&
 770                                  fileset->logicalBlockNum == 0xFFFFFFFF &&
 771                                  fileset->partitionReferenceNum == 0xFFFF);
 772                 }
 773         }
 774
 775         if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
 776              fileset->partitionReferenceNum != 0xFFFF) && bh) {
 777                 udf_debug("Fileset at block=%d, partition=%d\n",
 778                           fileset->logicalBlockNum,
 779                           fileset->partitionReferenceNum);
 780
 781                 sbi->s_partition = fileset->partitionReferenceNum;
 782                 udf_load_fileset(sb, bh, root);
 783                 brelse(bh);
 784                 return 0;
 785         }
 786         return 1;
 787 }
 788
 789 static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
 790 {
 791         struct primaryVolDesc *pvoldesc;
 792         struct ustr *instr, *outstr;
 793         struct buffer_head *bh;
 794         uint16_t ident;
 795         int ret = 1;
 796
 797         instr = kmalloc(sizeof(struct ustr), GFP_NOFS);
 798         if (!instr)
 799                 return 1;
 800
 801         outstr = kmalloc(sizeof(struct ustr), GFP_NOFS);
 802         if (!outstr)
 803                 goto out1;
 804
 805         bh = udf_read_tagged(sb, block, block, &ident);
 806         if (!bh)
 807                 goto out2;
 808
 809         BUG_ON(ident != TAG_IDENT_PVD);
 810
 811         pvoldesc = (struct primaryVolDesc *)bh->b_data;
 812
 813         if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
 814                               pvoldesc->recordingDateAndTime)) {
 815 #ifdef UDFFS_DEBUG
 816                 struct timestamp *ts = &pvoldesc->recordingDateAndTime;
 817                 udf_debug("recording time %04u/%02u/%02u"
 818                           " %02u:%02u (%x)\n",
 819                           le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
 820                           ts->minute, le16_to_cpu(ts->typeAndTimezone));
 821 #endif
 822         }
 823
 824         if (!udf_build_ustr(instr, pvoldesc->volIdent, 32))
 825                 if (udf_CS0toUTF8(outstr, instr)) {
 826                         strncpy(UDF_SB(sb)->s_volume_ident, outstr->u_name,
 827                                 outstr->u_len > 31 ? 31 : outstr->u_len);
 828                         udf_debug("volIdent[] = '%s'\n",
 829                                         UDF_SB(sb)->s_volume_ident);
 830                 }
 831
 832         if (!udf_build_ustr(instr, pvoldesc->volSetIdent, 128))
 833                 if (udf_CS0toUTF8(outstr, instr))
 834                         udf_debug("volSetIdent[] = '%s'\n", outstr->u_name);
 835
 836         brelse(bh);
 837         ret = 0;
 838 out2:
 839         kfree(outstr);
 840 out1:
 841         kfree(instr);
 842         return ret;
 843 }
 844
 845 static int udf_load_metadata_files(struct super_block *sb, int partition)
 846 {
 847         struct udf_sb_info *sbi = UDF_SB(sb);
 848         struct udf_part_map *map;
 849         struct udf_meta_data *mdata;
 850         struct kernel_lb_addr addr;
 851         int fe_error = 0;
 852
 853         map = &sbi->s_partmaps[partition];
 854         mdata = &map->s_type_specific.s_metadata;
 855
 856         /* metadata address */
 857         addr.logicalBlockNum =  mdata->s_meta_file_loc;
 858         addr.partitionReferenceNum = map->s_partition_num;
 859
 860         udf_debug("Metadata file location: block = %d part = %d\n",
 861                           addr.logicalBlockNum, addr.partitionReferenceNum);
 862
 863         mdata->s_metadata_fe = udf_iget(sb, &addr);
 864
 865         if (mdata->s_metadata_fe == NULL) {
 866                 udf_warning(sb, __func__, "metadata inode efe not found, "
 867                                 "will try mirror inode.");
 868                 fe_error = 1;
 869         } else if (UDF_I(mdata->s_metadata_fe)->i_alloc_type !=
 870                  ICBTAG_FLAG_AD_SHORT) {
 871                 udf_warning(sb, __func__, "metadata inode efe does not have "
 872                         "short allocation descriptors!");
 873                 fe_error = 1;
 874                 iput(mdata->s_metadata_fe);
 875                 mdata->s_metadata_fe = NULL;
 876         }
 877
 878         /* mirror file entry */
 879         addr.logicalBlockNum = mdata->s_mirror_file_loc;
 880         addr.partitionReferenceNum = map->s_partition_num;
 881
 882         udf_debug("Mirror metadata file location: block = %d part = %d\n",
 883                           addr.logicalBlockNum, addr.partitionReferenceNum);
 884
 885         mdata->s_mirror_fe = udf_iget(sb, &addr);
 886
 887         if (mdata->s_mirror_fe == NULL) {
 888                 if (fe_error) {
 889                         udf_error(sb, __func__, "mirror inode efe not found "
 890                         "and metadata inode is missing too, exiting...");
 891                         goto error_exit;
 892                 } else
 893                         udf_warning(sb, __func__, "mirror inode efe not found,"
 894                                         " but metadata inode is OK");
 895         } else if (UDF_I(mdata->s_mirror_fe)->i_alloc_type !=
 896                  ICBTAG_FLAG_AD_SHORT) {
 897                 udf_warning(sb, __func__, "mirror inode efe does not have "
 898                         "short allocation descriptors!");
 899                 iput(mdata->s_mirror_fe);
 900                 mdata->s_mirror_fe = NULL;
 901                 if (fe_error)
 902                         goto error_exit;
 903         }
 904
 905         /*
 906          * bitmap file entry
 907          * Note:
 908          * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
 909         */
 910         if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
 911                 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
 912                 addr.partitionReferenceNum = map->s_partition_num;
 913
 914                 udf_debug("Bitmap file location: block = %d part = %d\n",
 915                         addr.logicalBlockNum, addr.partitionReferenceNum);
 916
 917                 mdata->s_bitmap_fe = udf_iget(sb, &addr);
 918
 919                 if (mdata->s_bitmap_fe == NULL) {
 920                         if (sb->s_flags & MS_RDONLY)
 921                                 udf_warning(sb, __func__, "bitmap inode efe "
 922                                         "not found but it's ok since the disc"
 923                                         " is mounted read-only");
 924                         else {
 925                                 udf_error(sb, __func__, "bitmap inode efe not "
 926                                         "found and attempted read-write mount");
 927                                 goto error_exit;
 928                         }
 929                 }
 930         }
 931
 932         udf_debug("udf_load_metadata_files Ok\n");
 933
 934         return 0;
 935
 936 error_exit:
 937         return 1;
 938 }
 939
 940 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
 941                              struct kernel_lb_addr *root)
 942 {
 943         struct fileSetDesc *fset;
 944
 945         fset = (struct fileSetDesc *)bh->b_data;
 946
 947         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
 948
 949         UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
 950
 951         udf_debug("Rootdir at block=%d, partition=%d\n",
 952                   root->logicalBlockNum, root->partitionReferenceNum);
 953 }
 954
 955 int udf_compute_nr_groups(struct super_block *sb, u32 partition)
 956 {
 957         struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
 958         return DIV_ROUND_UP(map->s_partition_len +
 959                             (sizeof(struct spaceBitmapDesc) << 3),
 960                             sb->s_blocksize * 8);
 961 }
 962
 963 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
 964 {
 965         struct udf_bitmap *bitmap;
 966         int nr_groups;
 967         int size;
 968
 969         nr_groups = udf_compute_nr_groups(sb, index);
 970         size = sizeof(struct udf_bitmap) +
 971                 (sizeof(struct buffer_head *) * nr_groups);
 972
 973         if (size <= PAGE_SIZE)
 974                 bitmap = kmalloc(size, GFP_KERNEL);
 975         else
 976                 bitmap = vmalloc(size); /* TODO: get rid of vmalloc */
 977
 978         if (bitmap == NULL) {
 979                 udf_error(sb, __func__,
 980                           "Unable to allocate space for bitmap "
 981                           "and %d buffer_head pointers", nr_groups);
 982                 return NULL;
 983         }
 984
 985         memset(bitmap, 0x00, size);
 986         bitmap->s_block_bitmap = (struct buffer_head **)(bitmap + 1);
 987         bitmap->s_nr_groups = nr_groups;
 988         return bitmap;
 989 }
 990
 991 static int udf_fill_partdesc_info(struct super_block *sb,
 992                 struct partitionDesc *p, int p_index)
 993 {
 994         struct udf_part_map *map;
 995         struct udf_sb_info *sbi = UDF_SB(sb);
 996         struct partitionHeaderDesc *phd;
 997
 998         map = &sbi->s_partmaps[p_index];
 999
1000         map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
1001         map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
1002
1003         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
1004                 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
1005         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
1006                 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
1007         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
1008                 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
1009         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
1010                 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
1011
1012         udf_debug("Partition (%d type %x) starts at physical %d, "
1013                   "block length %d\n", p_index,
1014                   map->s_partition_type, map->s_partition_root,
1015                   map->s_partition_len);
1016
1017         if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1018             strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
1019                 return 0;
1020
1021         phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1022         if (phd->unallocSpaceTable.extLength) {
1023                 struct kernel_lb_addr loc = {
1024                         .logicalBlockNum = le32_to_cpu(
1025                                 phd->unallocSpaceTable.extPosition),
1026                         .partitionReferenceNum = p_index,
1027                 };
1028
1029                 map->s_uspace.s_table = udf_iget(sb, &loc);
1030                 if (!map->s_uspace.s_table) {
1031                         udf_debug("cannot load unallocSpaceTable (part %d)\n",
1032                                         p_index);
1033                         return 1;
1034                 }
1035                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1036                 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
1037                                 p_index, map->s_uspace.s_table->i_ino);
1038         }
1039
1040         if (phd->unallocSpaceBitmap.extLength) {
1041                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1042                 if (!bitmap)
1043                         return 1;
1044                 map->s_uspace.s_bitmap = bitmap;
1045                 bitmap->s_extLength = le32_to_cpu(
1046                                 phd->unallocSpaceBitmap.extLength);
1047                 bitmap->s_extPosition = le32_to_cpu(
1048                                 phd->unallocSpaceBitmap.extPosition);
1049                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1050                 udf_debug("unallocSpaceBitmap (part %d) @ %d\n", p_index,
1051                                                 bitmap->s_extPosition);
1052         }
1053
1054         if (phd->partitionIntegrityTable.extLength)
1055                 udf_debug("partitionIntegrityTable (part %d)\n", p_index);
1056
1057         if (phd->freedSpaceTable.extLength) {
1058                 struct kernel_lb_addr loc = {
1059                         .logicalBlockNum = le32_to_cpu(
1060                                 phd->freedSpaceTable.extPosition),
1061                         .partitionReferenceNum = p_index,
1062                 };
1063
1064                 map->s_fspace.s_table = udf_iget(sb, &loc);
1065                 if (!map->s_fspace.s_table) {
1066                         udf_debug("cannot load freedSpaceTable (part %d)\n",
1067                                 p_index);
1068                         return 1;
1069                 }
1070
1071                 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
1072                 udf_debug("freedSpaceTable (part %d) @ %ld\n",
1073                                 p_index, map->s_fspace.s_table->i_ino);
1074         }
1075
1076         if (phd->freedSpaceBitmap.extLength) {
1077                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1078                 if (!bitmap)
1079                         return 1;
1080                 map->s_fspace.s_bitmap = bitmap;
1081                 bitmap->s_extLength = le32_to_cpu(
1082                                 phd->freedSpaceBitmap.extLength);
1083                 bitmap->s_extPosition = le32_to_cpu(
1084                                 phd->freedSpaceBitmap.extPosition);
1085                 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1086                 udf_debug("freedSpaceBitmap (part %d) @ %d\n", p_index,
1087                                         bitmap->s_extPosition);
1088         }
1089         return 0;
1090 }
1091
1092 static void udf_find_vat_block(struct super_block *sb, int p_index,
1093                                int type1_index, sector_t start_block)
1094 {
1095         struct udf_sb_info *sbi = UDF_SB(sb);
1096         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1097         sector_t vat_block;
1098         struct kernel_lb_addr ino;
1099
1100         /*
1101          * VAT file entry is in the last recorded block. Some broken disks have
1102          * it a few blocks before so try a bit harder...
1103          */
1104         ino.partitionReferenceNum = type1_index;
1105         for (vat_block = start_block;
1106              vat_block >= map->s_partition_root &&
1107              vat_block >= start_block - 3 &&
1108              !sbi->s_vat_inode; vat_block--) {
1109                 ino.logicalBlockNum = vat_block - map->s_partition_root;
1110                 sbi->s_vat_inode = udf_iget(sb, &ino);
1111         }
1112 }
1113
1114 static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1115 {
1116         struct udf_sb_info *sbi = UDF_SB(sb);
1117         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1118         struct buffer_head *bh = NULL;
1119         struct udf_inode_info *vati;
1120         uint32_t pos;
1121         struct virtualAllocationTable20 *vat20;
1122         sector_t blocks = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
1123
1124         udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block);
1125         if (!sbi->s_vat_inode &&
1126             sbi->s_last_block != blocks - 1) {
1127                 printk(KERN_NOTICE "UDF-fs: Failed to read VAT inode from the"
1128                        " last recorded block (%lu), retrying with the last "
1129                        "block of the device (%lu).\n",
1130                        (unsigned long)sbi->s_last_block,
1131                        (unsigned long)blocks - 1);
1132                 udf_find_vat_block(sb, p_index, type1_index, blocks - 1);
1133         }
1134         if (!sbi->s_vat_inode)
1135                 return 1;
1136
1137         if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1138                 map->s_type_specific.s_virtual.s_start_offset = 0;
1139                 map->s_type_specific.s_virtual.s_num_entries =
1140                         (sbi->s_vat_inode->i_size - 36) >> 2;
1141         } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1142                 vati = UDF_I(sbi->s_vat_inode);
1143                 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1144                         pos = udf_block_map(sbi->s_vat_inode, 0);
1145                         bh = sb_bread(sb, pos);
1146                         if (!bh)
1147                                 return 1;
1148                         vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1149                 } else {
1150                         vat20 = (struct virtualAllocationTable20 *)
1151                                                         vati->i_ext.i_data;
1152                 }
1153
1154                 map->s_type_specific.s_virtual.s_start_offset =
1155                         le16_to_cpu(vat20->lengthHeader);
1156                 map->s_type_specific.s_virtual.s_num_entries =
1157                         (sbi->s_vat_inode->i_size -
1158                                 map->s_type_specific.s_virtual.
1159                                         s_start_offset) >> 2;
1160                 brelse(bh);
1161         }
1162         return 0;
1163 }
1164
1165 static int udf_load_partdesc(struct super_block *sb, sector_t block)
1166 {
1167         struct buffer_head *bh;
1168         struct partitionDesc *p;
1169         struct udf_part_map *map;
1170         struct udf_sb_info *sbi = UDF_SB(sb);
1171         int i, type1_idx;
1172         uint16_t partitionNumber;
1173         uint16_t ident;
1174         int ret = 0;
1175
1176         bh = udf_read_tagged(sb, block, block, &ident);
1177         if (!bh)
1178                 return 1;
1179         if (ident != TAG_IDENT_PD)
1180                 goto out_bh;
1181
1182         p = (struct partitionDesc *)bh->b_data;
1183         partitionNumber = le16_to_cpu(p->partitionNumber);
1184
1185         /* First scan for TYPE1, SPARABLE and METADATA partitions */
1186         for (i = 0; i < sbi->s_partitions; i++) {
1187                 map = &sbi->s_partmaps[i];
1188                 udf_debug("Searching map: (%d == %d)\n",
1189                           map->s_partition_num, partitionNumber);
1190                 if (map->s_partition_num == partitionNumber &&
1191                     (map->s_partition_type == UDF_TYPE1_MAP15 ||
1192                      map->s_partition_type == UDF_SPARABLE_MAP15))
1193                         break;
1194         }
1195
1196         if (i >= sbi->s_partitions) {
1197                 udf_debug("Partition (%d) not found in partition map\n",
1198                           partitionNumber);
1199                 goto out_bh;
1200         }
1201
1202         ret = udf_fill_partdesc_info(sb, p, i);
1203
1204         /*
1205          * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1206          * PHYSICAL partitions are already set up
1207          */
1208         type1_idx = i;
1209         for (i = 0; i < sbi->s_partitions; i++) {
1210                 map = &sbi->s_partmaps[i];
1211
1212                 if (map->s_partition_num == partitionNumber &&
1213                     (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1214                      map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1215                      map->s_partition_type == UDF_METADATA_MAP25))
1216                         break;
1217         }
1218
1219         if (i >= sbi->s_partitions)
1220                 goto out_bh;
1221
1222         ret = udf_fill_partdesc_info(sb, p, i);
1223         if (ret)
1224                 goto out_bh;
1225
1226         if (map->s_partition_type == UDF_METADATA_MAP25) {
1227                 ret = udf_load_metadata_files(sb, i);
1228                 if (ret) {
1229                         printk(KERN_ERR "UDF-fs: error loading MetaData "
1230                         "partition map %d\n", i);
1231                         goto out_bh;
1232                 }
1233         } else {
1234                 ret = udf_load_vat(sb, i, type1_idx);
1235                 if (ret)
1236                         goto out_bh;
1237                 /*
1238                  * Mark filesystem read-only if we have a partition with
1239                  * virtual map since we don't handle writing to it (we
1240                  * overwrite blocks instead of relocating them).
1241                  */
1242                 sb->s_flags |= MS_RDONLY;
1243                 printk(KERN_NOTICE "UDF-fs: Filesystem marked read-only "
1244                         "because writing to pseudooverwrite partition is "
1245                         "not implemented.\n");
1246         }
1247 out_bh:
1248         /* In case loading failed, we handle cleanup in udf_fill_super */
1249         brelse(bh);
1250         return ret;
1251 }
1252
1253 static int udf_load_logicalvol(struct super_block *sb, sector_t block,
1254                                struct kernel_lb_addr *fileset)
1255 {
1256         struct logicalVolDesc *lvd;
1257         int i, j, offset;
1258         uint8_t type;
1259         struct udf_sb_info *sbi = UDF_SB(sb);
1260         struct genericPartitionMap *gpm;
1261         uint16_t ident;
1262         struct buffer_head *bh;
1263         int ret = 0;
1264
1265         bh = udf_read_tagged(sb, block, block, &ident);
1266         if (!bh)
1267                 return 1;
1268         BUG_ON(ident != TAG_IDENT_LVD);
1269         lvd = (struct logicalVolDesc *)bh->b_data;
1270
1271         i = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1272         if (i != 0) {
1273                 ret = i;
1274                 goto out_bh;
1275         }
1276
1277         for (i = 0, offset = 0;
1278              i < sbi->s_partitions && offset < le32_to_cpu(lvd->mapTableLength);
1279              i++, offset += gpm->partitionMapLength) {
1280                 struct udf_part_map *map = &sbi->s_partmaps[i];
1281                 gpm = (struct genericPartitionMap *)
1282                                 &(lvd->partitionMaps[offset]);
1283                 type = gpm->partitionMapType;
1284                 if (type == 1) {
1285                         struct genericPartitionMap1 *gpm1 =
1286                                 (struct genericPartitionMap1 *)gpm;
1287                         map->s_partition_type = UDF_TYPE1_MAP15;
1288                         map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1289                         map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1290                         map->s_partition_func = NULL;
1291                 } else if (type == 2) {
1292                         struct udfPartitionMap2 *upm2 =
1293                                                 (struct udfPartitionMap2 *)gpm;
1294                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1295                                                 strlen(UDF_ID_VIRTUAL))) {
1296                                 u16 suf =
1297                                         le16_to_cpu(((__le16 *)upm2->partIdent.
1298                                                         identSuffix)[0]);
1299                                 if (suf < 0x0200) {
1300                                         map->s_partition_type =
1301                                                         UDF_VIRTUAL_MAP15;
1302                                         map->s_partition_func =
1303                                                         udf_get_pblock_virt15;
1304                                 } else {
1305                                         map->s_partition_type =
1306                                                         UDF_VIRTUAL_MAP20;
1307                                         map->s_partition_func =
1308                                                         udf_get_pblock_virt20;
1309                                 }
1310                         } else if (!strncmp(upm2->partIdent.ident,
1311                                                 UDF_ID_SPARABLE,
1312                                                 strlen(UDF_ID_SPARABLE))) {
1313                                 uint32_t loc;
1314                                 struct sparingTable *st;
1315                                 struct sparablePartitionMap *spm =
1316                                         (struct sparablePartitionMap *)gpm;
1317
1318                                 map->s_partition_type = UDF_SPARABLE_MAP15;
1319                                 map->s_type_specific.s_sparing.s_packet_len =
1320                                                 le16_to_cpu(spm->packetLength);
1321                                 for (j = 0; j < spm->numSparingTables; j++) {
1322                                         struct buffer_head *bh2;
1323
1324                                         loc = le32_to_cpu(
1325                                                 spm->locSparingTable[j]);
1326                                         bh2 = udf_read_tagged(sb, loc, loc,
1327                                                              &ident);
1328                                         map->s_type_specific.s_sparing.
1329                                                         s_spar_map[j] = bh2;
1330
1331                                         if (bh2 == NULL)
1332                                                 continue;
1333
1334                                         st = (struct sparingTable *)bh2->b_data;
1335                                         if (ident != 0 || strncmp(
1336                                                 st->sparingIdent.ident,
1337                                                 UDF_ID_SPARING,
1338                                                 strlen(UDF_ID_SPARING))) {
1339                                                 brelse(bh2);
1340                                                 map->s_type_specific.s_sparing.
1341                                                         s_spar_map[j] = NULL;
1342                                         }
1343                                 }
1344                                 map->s_partition_func = udf_get_pblock_spar15;
1345                         } else if (!strncmp(upm2->partIdent.ident,
1346                                                 UDF_ID_METADATA,
1347                                                 strlen(UDF_ID_METADATA))) {
1348                                 struct udf_meta_data *mdata =
1349                                         &map->s_type_specific.s_metadata;
1350                                 struct metadataPartitionMap *mdm =
1351                                                 (struct metadataPartitionMap *)
1352                                                 &(lvd->partitionMaps[offset]);
1353                                 udf_debug("Parsing Logical vol part %d "
1354                                         "type %d  id=%s\n", i, type,
1355                                         UDF_ID_METADATA);
1356
1357                                 map->s_partition_type = UDF_METADATA_MAP25;
1358                                 map->s_partition_func = udf_get_pblock_meta25;
1359
1360                                 mdata->s_meta_file_loc   =
1361                                         le32_to_cpu(mdm->metadataFileLoc);
1362                                 mdata->s_mirror_file_loc =
1363                                         le32_to_cpu(mdm->metadataMirrorFileLoc);
1364                                 mdata->s_bitmap_file_loc =
1365                                         le32_to_cpu(mdm->metadataBitmapFileLoc);
1366                                 mdata->s_alloc_unit_size =
1367                                         le32_to_cpu(mdm->allocUnitSize);
1368                                 mdata->s_align_unit_size =
1369                                         le16_to_cpu(mdm->alignUnitSize);
1370                                 mdata->s_dup_md_flag     =
1371                                         mdm->flags & 0x01;
1372
1373                                 udf_debug("Metadata Ident suffix=0x%x\n",
1374                                         (le16_to_cpu(
1375                                          ((__le16 *)
1376                                               mdm->partIdent.identSuffix)[0])));
1377                                 udf_debug("Metadata part num=%d\n",
1378                                         le16_to_cpu(mdm->partitionNum));
1379                                 udf_debug("Metadata part alloc unit size=%d\n",
1380                                         le32_to_cpu(mdm->allocUnitSize));
1381                                 udf_debug("Metadata file loc=%d\n",
1382                                         le32_to_cpu(mdm->metadataFileLoc));
1383                                 udf_debug("Mirror file loc=%d\n",
1384                                        le32_to_cpu(mdm->metadataMirrorFileLoc));
1385                                 udf_debug("Bitmap file loc=%d\n",
1386                                        le32_to_cpu(mdm->metadataBitmapFileLoc));
1387                                 udf_debug("Duplicate Flag: %d %d\n",
1388                                         mdata->s_dup_md_flag, mdm->flags);
1389                         } else {
1390                                 udf_debug("Unknown ident: %s\n",
1391                                           upm2->partIdent.ident);
1392                                 continue;
1393                         }
1394                         map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1395                         map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1396                 }
1397                 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1398                           i, map->s_partition_num, type,
1399                           map->s_volumeseqnum);
1400         }
1401
1402         if (fileset) {
1403                 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
1404
1405                 *fileset = lelb_to_cpu(la->extLocation);
1406                 udf_debug("FileSet found in LogicalVolDesc at block=%d, "
1407                           "partition=%d\n", fileset->logicalBlockNum,
1408                           fileset->partitionReferenceNum);
1409         }
1410         if (lvd->integritySeqExt.extLength)
1411                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1412
1413 out_bh:
1414         brelse(bh);
1415         return ret;
1416 }
1417
1418 /*
1419  * udf_load_logicalvolint
1420  *
1421  */
1422 static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
1423 {
1424         struct buffer_head *bh = NULL;
1425         uint16_t ident;
1426         struct udf_sb_info *sbi = UDF_SB(sb);
1427         struct logicalVolIntegrityDesc *lvid;
1428
1429         while (loc.extLength > 0 &&
1430                (bh = udf_read_tagged(sb, loc.extLocation,
1431                                      loc.extLocation, &ident)) &&
1432                ident == TAG_IDENT_LVID) {
1433                 sbi->s_lvid_bh = bh;
1434                 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1435
1436                 if (lvid->nextIntegrityExt.extLength)
1437                         udf_load_logicalvolint(sb,
1438                                 leea_to_cpu(lvid->nextIntegrityExt));
1439
1440                 if (sbi->s_lvid_bh != bh)
1441                         brelse(bh);
1442                 loc.extLength -= sb->s_blocksize;
1443                 loc.extLocation++;
1444         }
1445         if (sbi->s_lvid_bh != bh)
1446                 brelse(bh);
1447 }
1448
1449 /*
1450  * udf_process_sequence
1451  *
1452  * PURPOSE
1453  *      Process a main/reserve volume descriptor sequence.
1454  *
1455  * PRE-CONDITIONS
1456  *      sb                      Pointer to _locked_ superblock.
1457  *      block                   First block of first extent of the sequence.
1458  *      lastblock               Lastblock of first extent of the sequence.
1459  *
1460  * HISTORY
1461  *      July 1, 1997 - Andrew E. Mileski
1462  *      Written, tested, and released.
1463  */
1464 static noinline int udf_process_sequence(struct super_block *sb, long block,
1465                                 long lastblock, struct kernel_lb_addr *fileset)
1466 {
1467         struct buffer_head *bh = NULL;
1468         struct udf_vds_record vds[VDS_POS_LENGTH];
1469         struct udf_vds_record *curr;
1470         struct generic_desc *gd;
1471         struct volDescPtr *vdp;
1472         int done = 0;
1473         uint32_t vdsn;
1474         uint16_t ident;
1475         long next_s = 0, next_e = 0;
1476
1477         memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1478
1479         /*
1480          * Read the main descriptor sequence and find which descriptors
1481          * are in it.
1482          */
1483         for (; (!done && block <= lastblock); block++) {
1484
1485                 bh = udf_read_tagged(sb, block, block, &ident);
1486                 if (!bh) {
1487                         printk(KERN_ERR "udf: Block %Lu of volume descriptor "
1488                                "sequence is corrupted or we could not read "
1489                                "it.\n", (unsigned long long)block);
1490                         return 1;
1491                 }
1492
1493                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1494                 gd = (struct generic_desc *)bh->b_data;
1495                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1496                 switch (ident) {
1497                 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1498                         curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1499                         if (vdsn >= curr->volDescSeqNum) {
1500                                 curr->volDescSeqNum = vdsn;
1501                                 curr->block = block;
1502                         }
1503                         break;
1504                 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1505                         curr = &vds[VDS_POS_VOL_DESC_PTR];
1506                         if (vdsn >= curr->volDescSeqNum) {
1507                                 curr->volDescSeqNum = vdsn;
1508                                 curr->block = block;
1509
1510                                 vdp = (struct volDescPtr *)bh->b_data;
1511                                 next_s = le32_to_cpu(
1512                                         vdp->nextVolDescSeqExt.extLocation);
1513                                 next_e = le32_to_cpu(
1514                                         vdp->nextVolDescSeqExt.extLength);
1515                                 next_e = next_e >> sb->s_blocksize_bits;
1516                                 next_e += next_s;
1517                         }
1518                         break;
1519                 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1520                         curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1521                         if (vdsn >= curr->volDescSeqNum) {
1522                                 curr->volDescSeqNum = vdsn;
1523                                 curr->block = block;
1524                         }
1525                         break;
1526                 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1527                         curr = &vds[VDS_POS_PARTITION_DESC];
1528                         if (!curr->block)
1529                                 curr->block = block;
1530                         break;
1531                 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1532                         curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1533                         if (vdsn >= curr->volDescSeqNum) {
1534                                 curr->volDescSeqNum = vdsn;
1535                                 curr->block = block;
1536                         }
1537                         break;
1538                 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1539                         curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1540                         if (vdsn >= curr->volDescSeqNum) {
1541                                 curr->volDescSeqNum = vdsn;
1542                                 curr->block = block;
1543                         }
1544                         break;
1545                 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1546                         vds[VDS_POS_TERMINATING_DESC].block = block;
1547                         if (next_e) {
1548                                 block = next_s;
1549                                 lastblock = next_e;
1550                                 next_s = next_e = 0;
1551                         } else
1552                                 done = 1;
1553                         break;
1554                 }
1555                 brelse(bh);
1556         }
1557         /*
1558          * Now read interesting descriptors again and process them
1559          * in a suitable order
1560          */
1561         if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1562                 printk(KERN_ERR "udf: Primary Volume Descriptor not found!\n");
1563                 return 1;
1564         }
1565         if (udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block))
1566                 return 1;
1567
1568         if (vds[VDS_POS_LOGICAL_VOL_DESC].block && udf_load_logicalvol(sb,
1569             vds[VDS_POS_LOGICAL_VOL_DESC].block, fileset))
1570                 return 1;
1571
1572         if (vds[VDS_POS_PARTITION_DESC].block) {
1573                 /*
1574                  * We rescan the whole descriptor sequence to find
1575                  * partition descriptor blocks and process them.
1576                  */
1577                 for (block = vds[VDS_POS_PARTITION_DESC].block;
1578                      block < vds[VDS_POS_TERMINATING_DESC].block;
1579                      block++)
1580                         if (udf_load_partdesc(sb, block))
1581                                 return 1;
1582         }
1583
1584         return 0;
1585 }
1586
1587 static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh,
1588                              struct kernel_lb_addr *fileset)
1589 {
1590         struct anchorVolDescPtr *anchor;
1591         long main_s, main_e, reserve_s, reserve_e;
1592         struct udf_sb_info *sbi;
1593
1594         sbi = UDF_SB(sb);
1595         anchor = (struct anchorVolDescPtr *)bh->b_data;
1596
1597         /* Locate the main sequence */
1598         main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1599         main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1600         main_e = main_e >> sb->s_blocksize_bits;
1601         main_e += main_s;
1602
1603         /* Locate the reserve sequence */
1604         reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1605         reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1606         reserve_e = reserve_e >> sb->s_blocksize_bits;
1607         reserve_e += reserve_s;
1608
1609         /* Process the main & reserve sequences */
1610         /* responsible for finding the PartitionDesc(s) */
1611         if (!udf_process_sequence(sb, main_s, main_e, fileset))
1612                 return 1;
1613         return !udf_process_sequence(sb, reserve_s, reserve_e, fileset);
1614 }
1615
1616 /*
1617  * Check whether there is an anchor block in the given block and
1618  * load Volume Descriptor Sequence if so.
1619  */
1620 static int udf_check_anchor_block(struct super_block *sb, sector_t block,
1621                                   struct kernel_lb_addr *fileset)
1622 {
1623         struct buffer_head *bh;
1624         uint16_t ident;
1625         int ret;
1626
1627         if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
1628             udf_fixed_to_variable(block) >=
1629             sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits)
1630                 return 0;
1631
1632         bh = udf_read_tagged(sb, block, block, &ident);
1633         if (!bh)
1634                 return 0;
1635         if (ident != TAG_IDENT_AVDP) {
1636                 brelse(bh);
1637                 return 0;
1638         }
1639         ret = udf_load_sequence(sb, bh, fileset);
1640         brelse(bh);
1641         return ret;
1642 }
1643
1644 /* Search for an anchor volume descriptor pointer */
1645 static sector_t udf_scan_anchors(struct super_block *sb, sector_t lastblock,
1646                                  struct kernel_lb_addr *fileset)
1647 {
1648         sector_t last[6];
1649         int i;
1650         struct udf_sb_info *sbi = UDF_SB(sb);
1651         int last_count = 0;
1652
1653         /* First try user provided anchor */
1654         if (sbi->s_anchor) {
1655                 if (udf_check_anchor_block(sb, sbi->s_anchor, fileset))
1656                         return lastblock;
1657         }
1658         /*
1659          * according to spec, anchor is in either:
1660          *     block 256
1661          *     lastblock-256
1662          *     lastblock
1663          *  however, if the disc isn't closed, it could be 512.
1664          */
1665         if (udf_check_anchor_block(sb, sbi->s_session + 256, fileset))
1666                 return lastblock;
1667         /*
1668          * The trouble is which block is the last one. Drives often misreport
1669          * this so we try various possibilities.
1670          */
1671         last[last_count++] = lastblock;
1672         if (lastblock >= 1)
1673                 last[last_count++] = lastblock - 1;
1674         last[last_count++] = lastblock + 1;
1675         if (lastblock >= 2)
1676                 last[last_count++] = lastblock - 2;
1677         if (lastblock >= 150)
1678                 last[last_count++] = lastblock - 150;
1679         if (lastblock >= 152)
1680                 last[last_count++] = lastblock - 152;
1681
1682         for (i = 0; i < last_count; i++) {
1683                 if (last[i] >= sb->s_bdev->bd_inode->i_size >>
1684                                 sb->s_blocksize_bits)
1685                         continue;
1686                 if (udf_check_anchor_block(sb, last[i], fileset))
1687                         return last[i];
1688                 if (last[i] < 256)
1689                         continue;
1690                 if (udf_check_anchor_block(sb, last[i] - 256, fileset))
1691                         return last[i];
1692         }
1693
1694         /* Finally try block 512 in case media is open */
1695         if (udf_check_anchor_block(sb, sbi->s_session + 512, fileset))
1696                 return last[0];
1697         return 0;
1698 }
1699
1700 /*
1701  * Find an anchor volume descriptor and load Volume Descriptor Sequence from
1702  * area specified by it. The function expects sbi->s_lastblock to be the last
1703  * block on the media.
1704  *
1705  * Return 1 if ok, 0 if not found.
1706  *
1707  */
1708 static int udf_find_anchor(struct super_block *sb,
1709                            struct kernel_lb_addr *fileset)
1710 {
1711         sector_t lastblock;
1712         struct udf_sb_info *sbi = UDF_SB(sb);
1713
1714         lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1715         if (lastblock)
1716                 goto out;
1717
1718         /* No anchor found? Try VARCONV conversion of block numbers */
1719         UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
1720         /* Firstly, we try to not convert number of the last block */
1721         lastblock = udf_scan_anchors(sb,
1722                                 udf_variable_to_fixed(sbi->s_last_block),
1723                                 fileset);
1724         if (lastblock)
1725                 goto out;
1726
1727         /* Secondly, we try with converted number of the last block */
1728         lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1729         if (!lastblock) {
1730                 /* VARCONV didn't help. Clear it. */
1731                 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
1732                 return 0;
1733         }
1734 out:
1735         sbi->s_last_block = lastblock;
1736         return 1;
1737 }
1738
1739 /*
1740  * Check Volume Structure Descriptor, find Anchor block and load Volume
1741  * Descriptor Sequence
1742  */
1743 static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
1744                         int silent, struct kernel_lb_addr *fileset)
1745 {
1746         struct udf_sb_info *sbi = UDF_SB(sb);
1747         loff_t nsr_off;
1748
1749         if (!sb_set_blocksize(sb, uopt->blocksize)) {
1750                 if (!silent)
1751                         printk(KERN_WARNING "UDF-fs: Bad block size\n");
1752                 return 0;
1753         }
1754         sbi->s_last_block = uopt->lastblock;
1755         if (!uopt->novrs) {
1756                 /* Check that it is NSR02 compliant */
1757                 nsr_off = udf_check_vsd(sb);
1758                 if (!nsr_off) {
1759                         if (!silent)
1760                                 printk(KERN_WARNING "UDF-fs: No VRS found\n");
1761                         return 0;
1762                 }
1763                 if (nsr_off == -1)
1764                         udf_debug("Failed to read byte 32768. Assuming open "
1765                                   "disc. Skipping validity check\n");
1766                 if (!sbi->s_last_block)
1767                         sbi->s_last_block = udf_get_last_block(sb);
1768         } else {
1769                 udf_debug("Validity check skipped because of novrs option\n");
1770         }
1771
1772         /* Look for anchor block and load Volume Descriptor Sequence */
1773         sbi->s_anchor = uopt->anchor;
1774         if (!udf_find_anchor(sb, fileset)) {
1775                 if (!silent)
1776                         printk(KERN_WARNING "UDF-fs: No anchor found\n");
1777                 return 0;
1778         }
1779         return 1;
1780 }
1781
1782 static void udf_open_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         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1792         lvidiu = udf_sb_lvidiu(sbi);
1793
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,
1797                                 CURRENT_TIME);
1798         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN);
1799
1800         lvid->descTag.descCRC = cpu_to_le16(
1801                 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1802                         le16_to_cpu(lvid->descTag.descCRCLength)));
1803
1804         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1805         mark_buffer_dirty(bh);
1806         sbi->s_lvid_dirty = 0;
1807 }
1808
1809 static void udf_close_lvid(struct super_block *sb)
1810 {
1811         struct udf_sb_info *sbi = UDF_SB(sb);
1812         struct buffer_head *bh = sbi->s_lvid_bh;
1813         struct logicalVolIntegrityDesc *lvid;
1814         struct logicalVolIntegrityDescImpUse *lvidiu;
1815
1816         if (!bh)
1817                 return;
1818
1819         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1820         lvidiu = udf_sb_lvidiu(sbi);
1821         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1822         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1823         udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
1824         if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1825                 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1826         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1827                 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1828         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
1829                 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
1830         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1831
1832         lvid->descTag.descCRC = cpu_to_le16(
1833                         crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1834                                 le16_to_cpu(lvid->descTag.descCRCLength)));
1835
1836         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1837         mark_buffer_dirty(bh);
1838         sbi->s_lvid_dirty = 0;
1839 }
1840
1841 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
1842 {
1843         int i;
1844         int nr_groups = bitmap->s_nr_groups;
1845         int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
1846                                                 nr_groups);
1847
1848         for (i = 0; i < nr_groups; i++)
1849                 if (bitmap->s_block_bitmap[i])
1850                         brelse(bitmap->s_block_bitmap[i]);
1851
1852         if (size <= PAGE_SIZE)
1853                 kfree(bitmap);
1854         else
1855                 vfree(bitmap);
1856 }
1857
1858 static void udf_free_partition(struct udf_part_map *map)
1859 {
1860         int i;
1861         struct udf_meta_data *mdata;
1862
1863         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1864                 iput(map->s_uspace.s_table);
1865         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1866                 iput(map->s_fspace.s_table);
1867         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1868                 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
1869         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1870                 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
1871         if (map->s_partition_type == UDF_SPARABLE_MAP15)
1872                 for (i = 0; i < 4; i++)
1873                         brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
1874         else if (map->s_partition_type == UDF_METADATA_MAP25) {
1875                 mdata = &map->s_type_specific.s_metadata;
1876                 iput(mdata->s_metadata_fe);
1877                 mdata->s_metadata_fe = NULL;
1878
1879                 iput(mdata->s_mirror_fe);
1880                 mdata->s_mirror_fe = NULL;
1881
1882                 iput(mdata->s_bitmap_fe);
1883                 mdata->s_bitmap_fe = NULL;
1884         }
1885 }
1886
1887 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1888 {
1889         int i;
1890         int ret;
1891         struct inode *inode = NULL;
1892         struct udf_options uopt;
1893         struct kernel_lb_addr rootdir, fileset;
1894         struct udf_sb_info *sbi;
1895
1896         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1897         uopt.uid = -1;
1898         uopt.gid = -1;
1899         uopt.umask = 0;
1900         uopt.fmode = UDF_INVALID_MODE;
1901         uopt.dmode = UDF_INVALID_MODE;
1902
1903         sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1904         if (!sbi)
1905                 return -ENOMEM;
1906
1907         sb->s_fs_info = sbi;
1908
1909         mutex_init(&sbi->s_alloc_mutex);
1910
1911         if (!udf_parse_options((char *)options, &uopt, false))
1912                 goto error_out;
1913
1914         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1915             uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
1916                 udf_error(sb, "udf_read_super",
1917                           "utf8 cannot be combined with iocharset\n");
1918                 goto error_out;
1919         }
1920 #ifdef CONFIG_UDF_NLS
1921         if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1922                 uopt.nls_map = load_nls_default();
1923                 if (!uopt.nls_map)
1924                         uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1925                 else
1926                         udf_debug("Using default NLS map\n");
1927         }
1928 #endif
1929         if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1930                 uopt.flags |= (1 << UDF_FLAG_UTF8);
1931
1932         fileset.logicalBlockNum = 0xFFFFFFFF;
1933         fileset.partitionReferenceNum = 0xFFFF;
1934
1935         sbi->s_flags = uopt.flags;
1936         sbi->s_uid = uopt.uid;
1937         sbi->s_gid = uopt.gid;
1938         sbi->s_umask = uopt.umask;
1939         sbi->s_fmode = uopt.fmode;
1940         sbi->s_dmode = uopt.dmode;
1941         sbi->s_nls_map = uopt.nls_map;
1942
1943         if (uopt.session == 0xFFFFFFFF)
1944                 sbi->s_session = udf_get_last_session(sb);
1945         else
1946                 sbi->s_session = uopt.session;
1947
1948         udf_debug("Multi-session=%d\n", sbi->s_session);
1949
1950         /* Fill in the rest of the superblock */
1951         sb->s_op = &udf_sb_ops;
1952         sb->s_export_op = &udf_export_ops;
1953         sb->dq_op = NULL;
1954         sb->s_dirt = 0;
1955         sb->s_magic = UDF_SUPER_MAGIC;
1956         sb->s_time_gran = 1000;
1957
1958         if (uopt.flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) {
1959                 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1960         } else {
1961                 uopt.blocksize = bdev_logical_block_size(sb->s_bdev);
1962                 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1963                 if (!ret && uopt.blocksize != UDF_DEFAULT_BLOCKSIZE) {
1964                         if (!silent)
1965                                 printk(KERN_NOTICE
1966                                        "UDF-fs: Rescanning with blocksize "
1967                                        "%d\n", UDF_DEFAULT_BLOCKSIZE);
1968                         uopt.blocksize = UDF_DEFAULT_BLOCKSIZE;
1969                         ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1970                 }
1971         }
1972         if (!ret) {
1973                 printk(KERN_WARNING "UDF-fs: No partition found (1)\n");
1974                 goto error_out;
1975         }
1976
1977         udf_debug("Lastblock=%d\n", sbi->s_last_block);
1978
1979         if (sbi->s_lvid_bh) {
1980                 struct logicalVolIntegrityDescImpUse *lvidiu =
1981                                                         udf_sb_lvidiu(sbi);
1982                 uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
1983                 uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
1984                 /* uint16_t maxUDFWriteRev =
1985                                 le16_to_cpu(lvidiu->maxUDFWriteRev); */
1986
1987                 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
1988                         printk(KERN_ERR "UDF-fs: minUDFReadRev=%x "
1989                                         "(max is %x)\n",
1990                                le16_to_cpu(lvidiu->minUDFReadRev),
1991                                UDF_MAX_READ_VERSION);
1992                         goto error_out;
1993                 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
1994                         sb->s_flags |= MS_RDONLY;
1995
1996                 sbi->s_udfrev = minUDFWriteRev;
1997
1998                 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1999                         UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
2000                 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
2001                         UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
2002         }
2003
2004         if (!sbi->s_partitions) {
2005                 printk(KERN_WARNING "UDF-fs: No partition found (2)\n");
2006                 goto error_out;
2007         }
2008
2009         if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
2010                         UDF_PART_FLAG_READ_ONLY) {
2011                 printk(KERN_NOTICE "UDF-fs: Partition marked readonly; "
2012                                    "forcing readonly mount\n");
2013                 sb->s_flags |= MS_RDONLY;
2014         }
2015
2016         if (udf_find_fileset(sb, &fileset, &rootdir)) {
2017                 printk(KERN_WARNING "UDF-fs: No fileset found\n");
2018                 goto error_out;
2019         }
2020
2021         if (!silent) {
2022                 struct timestamp ts;
2023                 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
2024                 udf_info("UDF: Mounting volume '%s', "
2025                          "timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
2026                          sbi->s_volume_ident, le16_to_cpu(ts.year), ts.month, ts.day,
2027                          ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
2028         }
2029         if (!(sb->s_flags & MS_RDONLY))
2030                 udf_open_lvid(sb);
2031
2032         /* Assign the root inode */
2033         /* assign inodes by physical block number */
2034         /* perhaps it's not extensible enough, but for now ... */
2035         inode = udf_iget(sb, &rootdir);
2036         if (!inode) {
2037                 printk(KERN_ERR "UDF-fs: Error in udf_iget, block=%d, "
2038                                 "partition=%d\n",
2039                        rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
2040                 goto error_out;
2041         }
2042
2043         /* Allocate a dentry for the root inode */
2044         sb->s_root = d_alloc_root(inode);
2045         if (!sb->s_root) {
2046                 printk(KERN_ERR "UDF-fs: Couldn't allocate root dentry\n");
2047                 iput(inode);
2048                 goto error_out;
2049         }
2050         sb->s_maxbytes = MAX_LFS_FILESIZE;
2051         return 0;
2052
2053 error_out:
2054         if (sbi->s_vat_inode)
2055                 iput(sbi->s_vat_inode);
2056         if (sbi->s_partitions)
2057                 for (i = 0; i < sbi->s_partitions; i++)
2058                         udf_free_partition(&sbi->s_partmaps[i]);
2059 #ifdef CONFIG_UDF_NLS
2060         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2061                 unload_nls(sbi->s_nls_map);
2062 #endif
2063         if (!(sb->s_flags & MS_RDONLY))
2064                 udf_close_lvid(sb);
2065         brelse(sbi->s_lvid_bh);
2066
2067         kfree(sbi->s_partmaps);
2068         kfree(sbi);
2069         sb->s_fs_info = NULL;
2070
2071         return -EINVAL;
2072 }
2073
2074 static void udf_error(struct super_block *sb, const char *function,
2075                       const char *fmt, ...)
2076 {
2077         va_list args;
2078
2079         if (!(sb->s_flags & MS_RDONLY)) {
2080                 /* mark sb error */
2081                 sb->s_dirt = 1;
2082         }
2083         va_start(args, fmt);
2084         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2085         va_end(args);
2086         printk(KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
2087                 sb->s_id, function, error_buf);
2088 }
2089
2090 void udf_warning(struct super_block *sb, const char *function,
2091                  const char *fmt, ...)
2092 {
2093         va_list args;
2094
2095         va_start(args, fmt);
2096         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2097         va_end(args);
2098         printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
2099                sb->s_id, function, error_buf);
2100 }
2101
2102 static void udf_put_super(struct super_block *sb)
2103 {
2104         int i;
2105         struct udf_sb_info *sbi;
2106
2107         sbi = UDF_SB(sb);
2108
2109         lock_kernel();
2110
2111         if (sbi->s_vat_inode)
2112                 iput(sbi->s_vat_inode);
2113         if (sbi->s_partitions)
2114                 for (i = 0; i < sbi->s_partitions; i++)
2115                         udf_free_partition(&sbi->s_partmaps[i]);
2116 #ifdef CONFIG_UDF_NLS
2117         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2118                 unload_nls(sbi->s_nls_map);
2119 #endif
2120         if (!(sb->s_flags & MS_RDONLY))
2121                 udf_close_lvid(sb);
2122         brelse(sbi->s_lvid_bh);
2123         kfree(sbi->s_partmaps);
2124         kfree(sb->s_fs_info);
2125         sb->s_fs_info = NULL;
2126
2127         unlock_kernel();
2128 }
2129
2130 static int udf_sync_fs(struct super_block *sb, int wait)
2131 {
2132         struct udf_sb_info *sbi = UDF_SB(sb);
2133
2134         mutex_lock(&sbi->s_alloc_mutex);
2135         if (sbi->s_lvid_dirty) {
2136                 /*
2137                  * Blockdevice will be synced later so we don't have to submit
2138                  * the buffer for IO
2139                  */
2140                 mark_buffer_dirty(sbi->s_lvid_bh);
2141                 sb->s_dirt = 0;
2142                 sbi->s_lvid_dirty = 0;
2143         }
2144         mutex_unlock(&sbi->s_alloc_mutex);
2145
2146         return 0;
2147 }
2148
2149 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
2150 {
2151         struct super_block *sb = dentry->d_sb;
2152         struct udf_sb_info *sbi = UDF_SB(sb);
2153         struct logicalVolIntegrityDescImpUse *lvidiu;
2154         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
2155
2156         if (sbi->s_lvid_bh != NULL)
2157                 lvidiu = udf_sb_lvidiu(sbi);
2158         else
2159                 lvidiu = NULL;
2160
2161         buf->f_type = UDF_SUPER_MAGIC;
2162         buf->f_bsize = sb->s_blocksize;
2163         buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
2164         buf->f_bfree = udf_count_free(sb);
2165         buf->f_bavail = buf->f_bfree;
2166         buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2167                                           le32_to_cpu(lvidiu->numDirs)) : 0)
2168                         + buf->f_bfree;
2169         buf->f_ffree = buf->f_bfree;
2170         buf->f_namelen = UDF_NAME_LEN - 2;
2171         buf->f_fsid.val[0] = (u32)id;
2172         buf->f_fsid.val[1] = (u32)(id >> 32);
2173
2174         return 0;
2175 }
2176
2177 static unsigned int udf_count_free_bitmap(struct super_block *sb,
2178                                           struct udf_bitmap *bitmap)
2179 {
2180         struct buffer_head *bh = NULL;
2181         unsigned int accum = 0;
2182         int index;
2183         int block = 0, newblock;
2184         struct kernel_lb_addr loc;
2185         uint32_t bytes;
2186         uint8_t *ptr;
2187         uint16_t ident;
2188         struct spaceBitmapDesc *bm;
2189
2190         lock_kernel();
2191
2192         loc.logicalBlockNum = bitmap->s_extPosition;
2193         loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
2194         bh = udf_read_ptagged(sb, &loc, 0, &ident);
2195
2196         if (!bh) {
2197                 printk(KERN_ERR "udf: udf_count_free failed\n");
2198                 goto out;
2199         } else if (ident != TAG_IDENT_SBD) {
2200                 brelse(bh);
2201                 printk(KERN_ERR "udf: udf_count_free failed\n");
2202                 goto out;
2203         }
2204
2205         bm = (struct spaceBitmapDesc *)bh->b_data;
2206         bytes = le32_to_cpu(bm->numOfBytes);
2207         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2208         ptr = (uint8_t *)bh->b_data;
2209
2210         while (bytes > 0) {
2211                 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2212                 accum += bitmap_weight((const unsigned long *)(ptr + index),
2213                                         cur_bytes * 8);
2214                 bytes -= cur_bytes;
2215                 if (bytes) {
2216                         brelse(bh);
2217                         newblock = udf_get_lb_pblock(sb, &loc, ++block);
2218                         bh = udf_tread(sb, newblock);
2219                         if (!bh) {
2220                                 udf_debug("read failed\n");
2221                                 goto out;
2222                         }
2223                         index = 0;
2224                         ptr = (uint8_t *)bh->b_data;
2225                 }
2226         }
2227         brelse(bh);
2228
2229 out:
2230         unlock_kernel();
2231
2232         return accum;
2233 }
2234
2235 static unsigned int udf_count_free_table(struct super_block *sb,
2236                                          struct inode *table)
2237 {
2238         unsigned int accum = 0;
2239         uint32_t elen;
2240         struct kernel_lb_addr eloc;
2241         int8_t etype;
2242         struct extent_position epos;
2243
2244         lock_kernel();
2245
2246         epos.block = UDF_I(table)->i_location;
2247         epos.offset = sizeof(struct unallocSpaceEntry);
2248         epos.bh = NULL;
2249
2250         while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2251                 accum += (elen >> table->i_sb->s_blocksize_bits);
2252
2253         brelse(epos.bh);
2254
2255         unlock_kernel();
2256
2257         return accum;
2258 }
2259
2260 static unsigned int udf_count_free(struct super_block *sb)
2261 {
2262         unsigned int accum = 0;
2263         struct udf_sb_info *sbi;
2264         struct udf_part_map *map;
2265
2266         sbi = UDF_SB(sb);
2267         if (sbi->s_lvid_bh) {
2268                 struct logicalVolIntegrityDesc *lvid =
2269                         (struct logicalVolIntegrityDesc *)
2270                         sbi->s_lvid_bh->b_data;
2271                 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
2272                         accum = le32_to_cpu(
2273                                         lvid->freeSpaceTable[sbi->s_partition]);
2274                         if (accum == 0xFFFFFFFF)
2275                                 accum = 0;
2276                 }
2277         }
2278
2279         if (accum)
2280                 return accum;
2281
2282         map = &sbi->s_partmaps[sbi->s_partition];
2283         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2284                 accum += udf_count_free_bitmap(sb,
2285                                                map->s_uspace.s_bitmap);
2286         }
2287         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
2288                 accum += udf_count_free_bitmap(sb,
2289                                                map->s_fspace.s_bitmap);
2290         }
2291         if (accum)
2292                 return accum;
2293
2294         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2295                 accum += udf_count_free_table(sb,
2296                                               map->s_uspace.s_table);
2297         }
2298         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
2299                 accum += udf_count_free_table(sb,
2300                                               map->s_fspace.s_table);
2301         }
2302
2303         return accum;
2304 }