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/buffer_head.h>
  52 #include <linux/vfs.h>
  53 #include <linux/vmalloc.h>
  54 #include <linux/errno.h>
  55 #include <linux/mount.h>
  56 #include <linux/seq_file.h>
  57 #include <linux/bitmap.h>
  58 #include <linux/crc-itu-t.h>
  59 #include <linux/log2.h>
  60 #include <asm/byteorder.h>
  61
  62 #include "udf_sb.h"
  63 #include "udf_i.h"
  64
  65 #include <linux/init.h>
  66 #include <asm/uaccess.h>
  67
  68 #define VDS_POS_PRIMARY_VOL_DESC        0
  69 #define VDS_POS_UNALLOC_SPACE_DESC      1
  70 #define VDS_POS_LOGICAL_VOL_DESC        2
  71 #define VDS_POS_PARTITION_DESC          3
  72 #define VDS_POS_IMP_USE_VOL_DESC        4
  73 #define VDS_POS_VOL_DESC_PTR            5
  74 #define VDS_POS_TERMINATING_DESC        6
  75 #define VDS_POS_LENGTH                  7
  76
  77 #define UDF_DEFAULT_BLOCKSIZE 2048
  78
  79 enum { UDF_MAX_LINKS = 0xffff };
  80
  81 /* These are the "meat" - everything else is stuffing */
  82 static int udf_fill_super(struct super_block *, void *, int);
  83 static void udf_put_super(struct super_block *);
  84 static int udf_sync_fs(struct super_block *, int);
  85 static int udf_remount_fs(struct super_block *, int *, char *);
  86 static void udf_load_logicalvolint(struct super_block *, struct kernel_extent_ad);
  87 static int udf_find_fileset(struct super_block *, struct kernel_lb_addr *,
  88                             struct kernel_lb_addr *);
  89 static void udf_load_fileset(struct super_block *, struct buffer_head *,
  90                              struct kernel_lb_addr *);
  91 static void udf_open_lvid(struct super_block *);
  92 static void udf_close_lvid(struct super_block *);
  93 static unsigned int udf_count_free(struct super_block *);
  94 static int udf_statfs(struct dentry *, struct kstatfs *);
  95 static int udf_show_options(struct seq_file *, struct dentry *);
  96
  97 struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct udf_sb_info *sbi)
  98 {
  99         struct logicalVolIntegrityDesc *lvid =
 100                 (struct logicalVolIntegrityDesc *)sbi->s_lvid_bh->b_data;
 101         __u32 number_of_partitions = le32_to_cpu(lvid->numOfPartitions);
 102         __u32 offset = number_of_partitions * 2 *
 103                                 sizeof(uint32_t)/sizeof(uint8_t);
 104         return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
 105 }
 106
 107 /* UDF filesystem type */
 108 static struct dentry *udf_mount(struct file_system_type *fs_type,
 109                       int flags, const char *dev_name, void *data)
 110 {
 111         return mount_bdev(fs_type, flags, dev_name, data, udf_fill_super);
 112 }
 113
 114 static struct file_system_type udf_fstype = {
 115         .owner          = THIS_MODULE,
 116         .name           = "udf",
 117         .mount          = udf_mount,
 118         .kill_sb        = kill_block_super,
 119         .fs_flags       = FS_REQUIRES_DEV,
 120 };
 121
 122 static struct kmem_cache *udf_inode_cachep;
 123
 124 static struct inode *udf_alloc_inode(struct super_block *sb)
 125 {
 126         struct udf_inode_info *ei;
 127         ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
 128         if (!ei)
 129                 return NULL;
 130
 131         ei->i_unique = 0;
 132         ei->i_lenExtents = 0;
 133         ei->i_next_alloc_block = 0;
 134         ei->i_next_alloc_goal = 0;
 135         ei->i_strat4096 = 0;
 136         init_rwsem(&ei->i_data_sem);
 137
 138         return &ei->vfs_inode;
 139 }
 140
 141 static void udf_i_callback(struct rcu_head *head)
 142 {
 143         struct inode *inode = container_of(head, struct inode, i_rcu);
 144         kmem_cache_free(udf_inode_cachep, UDF_I(inode));
 145 }
 146
 147 static void udf_destroy_inode(struct inode *inode)
 148 {
 149         call_rcu(&inode->i_rcu, udf_i_callback);
 150 }
 151
 152 static void init_once(void *foo)
 153 {
 154         struct udf_inode_info *ei = (struct udf_inode_info *)foo;
 155
 156         ei->i_ext.i_data = NULL;
 157         inode_init_once(&ei->vfs_inode);
 158 }
 159
 160 static int init_inodecache(void)
 161 {
 162         udf_inode_cachep = kmem_cache_create("udf_inode_cache",
 163                                              sizeof(struct udf_inode_info),
 164                                              0, (SLAB_RECLAIM_ACCOUNT |
 165                                                  SLAB_MEM_SPREAD),
 166                                              init_once);
 167         if (!udf_inode_cachep)
 168                 return -ENOMEM;
 169         return 0;
 170 }
 171
 172 static void destroy_inodecache(void)
 173 {
 174         kmem_cache_destroy(udf_inode_cachep);
 175 }
 176
 177 /* Superblock operations */
 178 static const struct super_operations udf_sb_ops = {
 179         .alloc_inode    = udf_alloc_inode,
 180         .destroy_inode  = udf_destroy_inode,
 181         .write_inode    = udf_write_inode,
 182         .evict_inode    = udf_evict_inode,
 183         .put_super      = udf_put_super,
 184         .sync_fs        = udf_sync_fs,
 185         .statfs         = udf_statfs,
 186         .remount_fs     = udf_remount_fs,
 187         .show_options   = udf_show_options,
 188 };
 189
 190 struct udf_options {
 191         unsigned char novrs;
 192         unsigned int blocksize;
 193         unsigned int session;
 194         unsigned int lastblock;
 195         unsigned int anchor;
 196         unsigned int volume;
 197         unsigned short partition;
 198         unsigned int fileset;
 199         unsigned int rootdir;
 200         unsigned int flags;
 201         umode_t umask;
 202         gid_t gid;
 203         uid_t uid;
 204         umode_t fmode;
 205         umode_t dmode;
 206         struct nls_table *nls_map;
 207 };
 208
 209 static int __init init_udf_fs(void)
 210 {
 211         int err;
 212
 213         err = init_inodecache();
 214         if (err)
 215                 goto out1;
 216         err = register_filesystem(&udf_fstype);
 217         if (err)
 218                 goto out;
 219
 220         return 0;
 221
 222 out:
 223         destroy_inodecache();
 224
 225 out1:
 226         return err;
 227 }
 228
 229 static void __exit exit_udf_fs(void)
 230 {
 231         unregister_filesystem(&udf_fstype);
 232         destroy_inodecache();
 233 }
 234
 235 module_init(init_udf_fs)
 236 module_exit(exit_udf_fs)
 237
 238 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
 239 {
 240         struct udf_sb_info *sbi = UDF_SB(sb);
 241
 242         sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map),
 243                                   GFP_KERNEL);
 244         if (!sbi->s_partmaps) {
 245                 udf_err(sb, "Unable to allocate space for %d partition maps\n",
 246                         count);
 247                 sbi->s_partitions = 0;
 248                 return -ENOMEM;
 249         }
 250
 251         sbi->s_partitions = count;
 252         return 0;
 253 }
 254
 255 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
 256 {
 257         int i;
 258         int nr_groups = bitmap->s_nr_groups;
 259         int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
 260                                                 nr_groups);
 261
 262         for (i = 0; i < nr_groups; i++)
 263                 if (bitmap->s_block_bitmap[i])
 264                         brelse(bitmap->s_block_bitmap[i]);
 265
 266         if (size <= PAGE_SIZE)
 267                 kfree(bitmap);
 268         else
 269                 vfree(bitmap);
 270 }
 271
 272 static void udf_free_partition(struct udf_part_map *map)
 273 {
 274         int i;
 275         struct udf_meta_data *mdata;
 276
 277         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
 278                 iput(map->s_uspace.s_table);
 279         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
 280                 iput(map->s_fspace.s_table);
 281         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
 282                 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
 283         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
 284                 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
 285         if (map->s_partition_type == UDF_SPARABLE_MAP15)
 286                 for (i = 0; i < 4; i++)
 287                         brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
 288         else if (map->s_partition_type == UDF_METADATA_MAP25) {
 289                 mdata = &map->s_type_specific.s_metadata;
 290                 iput(mdata->s_metadata_fe);
 291                 mdata->s_metadata_fe = NULL;
 292
 293                 iput(mdata->s_mirror_fe);
 294                 mdata->s_mirror_fe = NULL;
 295
 296                 iput(mdata->s_bitmap_fe);
 297                 mdata->s_bitmap_fe = NULL;
 298         }
 299 }
 300
 301 static void udf_sb_free_partitions(struct super_block *sb)
 302 {
 303         struct udf_sb_info *sbi = UDF_SB(sb);
 304         int i;
 305
 306         for (i = 0; i < sbi->s_partitions; i++)
 307                 udf_free_partition(&sbi->s_partmaps[i]);
 308         kfree(sbi->s_partmaps);
 309         sbi->s_partmaps = NULL;
 310 }
 311
 312 static int udf_show_options(struct seq_file *seq, struct dentry *root)
 313 {
 314         struct super_block *sb = root->d_sb;
 315         struct udf_sb_info *sbi = UDF_SB(sb);
 316
 317         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
 318                 seq_puts(seq, ",nostrict");
 319         if (UDF_QUERY_FLAG(sb, UDF_FLAG_BLOCKSIZE_SET))
 320                 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
 321         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
 322                 seq_puts(seq, ",unhide");
 323         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
 324                 seq_puts(seq, ",undelete");
 325         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
 326                 seq_puts(seq, ",noadinicb");
 327         if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
 328                 seq_puts(seq, ",shortad");
 329         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
 330                 seq_puts(seq, ",uid=forget");
 331         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_IGNORE))
 332                 seq_puts(seq, ",uid=ignore");
 333         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
 334                 seq_puts(seq, ",gid=forget");
 335         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE))
 336                 seq_puts(seq, ",gid=ignore");
 337         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
 338                 seq_printf(seq, ",uid=%u", sbi->s_uid);
 339         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
 340                 seq_printf(seq, ",gid=%u", sbi->s_gid);
 341         if (sbi->s_umask != 0)
 342                 seq_printf(seq, ",umask=%ho", sbi->s_umask);
 343         if (sbi->s_fmode != UDF_INVALID_MODE)
 344                 seq_printf(seq, ",mode=%ho", sbi->s_fmode);
 345         if (sbi->s_dmode != UDF_INVALID_MODE)
 346                 seq_printf(seq, ",dmode=%ho", sbi->s_dmode);
 347         if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
 348                 seq_printf(seq, ",session=%u", sbi->s_session);
 349         if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
 350                 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
 351         if (sbi->s_anchor != 0)
 352                 seq_printf(seq, ",anchor=%u", sbi->s_anchor);
 353         /*
 354          * volume, partition, fileset and rootdir seem to be ignored
 355          * currently
 356          */
 357         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
 358                 seq_puts(seq, ",utf8");
 359         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
 360                 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
 361
 362         return 0;
 363 }
 364
 365 /*
 366  * udf_parse_options
 367  *
 368  * PURPOSE
 369  *      Parse mount options.
 370  *
 371  * DESCRIPTION
 372  *      The following mount options are supported:
 373  *
 374  *      gid=            Set the default group.
 375  *      umask=          Set the default umask.
 376  *      mode=           Set the default file permissions.
 377  *      dmode=          Set the default directory permissions.
 378  *      uid=            Set the default user.
 379  *      bs=             Set the block size.
 380  *      unhide          Show otherwise hidden files.
 381  *      undelete        Show deleted files in lists.
 382  *      adinicb         Embed data in the inode (default)
 383  *      noadinicb       Don't embed data in the inode
 384  *      shortad         Use short ad's
 385  *      longad          Use long ad's (default)
 386  *      nostrict        Unset strict conformance
 387  *      iocharset=      Set the NLS character set
 388  *
 389  *      The remaining are for debugging and disaster recovery:
 390  *
 391  *      novrs           Skip volume sequence recognition
 392  *
 393  *      The following expect a offset from 0.
 394  *
 395  *      session=        Set the CDROM session (default= last session)
 396  *      anchor=         Override standard anchor location. (default= 256)
 397  *      volume=         Override the VolumeDesc location. (unused)
 398  *      partition=      Override the PartitionDesc location. (unused)
 399  *      lastblock=      Set the last block of the filesystem/
 400  *
 401  *      The following expect a offset from the partition root.
 402  *
 403  *      fileset=        Override the fileset block location. (unused)
 404  *      rootdir=        Override the root directory location. (unused)
 405  *              WARNING: overriding the rootdir to a non-directory may
 406  *              yield highly unpredictable results.
 407  *
 408  * PRE-CONDITIONS
 409  *      options         Pointer to mount options string.
 410  *      uopts           Pointer to mount options variable.
 411  *
 412  * POST-CONDITIONS
 413  *      <return>        1       Mount options parsed okay.
 414  *      <return>        0       Error parsing mount options.
 415  *
 416  * HISTORY
 417  *      July 1, 1997 - Andrew E. Mileski
 418  *      Written, tested, and released.
 419  */
 420
 421 enum {
 422         Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
 423         Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
 424         Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
 425         Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
 426         Opt_rootdir, Opt_utf8, Opt_iocharset,
 427         Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore,
 428         Opt_fmode, Opt_dmode
 429 };
 430
 431 static const match_table_t tokens = {
 432         {Opt_novrs,     "novrs"},
 433         {Opt_nostrict,  "nostrict"},
 434         {Opt_bs,        "bs=%u"},
 435         {Opt_unhide,    "unhide"},
 436         {Opt_undelete,  "undelete"},
 437         {Opt_noadinicb, "noadinicb"},
 438         {Opt_adinicb,   "adinicb"},
 439         {Opt_shortad,   "shortad"},
 440         {Opt_longad,    "longad"},
 441         {Opt_uforget,   "uid=forget"},
 442         {Opt_uignore,   "uid=ignore"},
 443         {Opt_gforget,   "gid=forget"},
 444         {Opt_gignore,   "gid=ignore"},
 445         {Opt_gid,       "gid=%u"},
 446         {Opt_uid,       "uid=%u"},
 447         {Opt_umask,     "umask=%o"},
 448         {Opt_session,   "session=%u"},
 449         {Opt_lastblock, "lastblock=%u"},
 450         {Opt_anchor,    "anchor=%u"},
 451         {Opt_volume,    "volume=%u"},
 452         {Opt_partition, "partition=%u"},
 453         {Opt_fileset,   "fileset=%u"},
 454         {Opt_rootdir,   "rootdir=%u"},
 455         {Opt_utf8,      "utf8"},
 456         {Opt_iocharset, "iocharset=%s"},
 457         {Opt_fmode,     "mode=%o"},
 458         {Opt_dmode,     "dmode=%o"},
 459         {Opt_err,       NULL}
 460 };
 461
 462 static int udf_parse_options(char *options, struct udf_options *uopt,
 463                              bool remount)
 464 {
 465         char *p;
 466         int option;
 467
 468         uopt->novrs = 0;
 469         uopt->partition = 0xFFFF;
 470         uopt->session = 0xFFFFFFFF;
 471         uopt->lastblock = 0;
 472         uopt->anchor = 0;
 473         uopt->volume = 0xFFFFFFFF;
 474         uopt->rootdir = 0xFFFFFFFF;
 475         uopt->fileset = 0xFFFFFFFF;
 476         uopt->nls_map = NULL;
 477
 478         if (!options)
 479                 return 1;
 480
 481         while ((p = strsep(&options, ",")) != NULL) {
 482                 substring_t args[MAX_OPT_ARGS];
 483                 int token;
 484                 if (!*p)
 485                         continue;
 486
 487                 token = match_token(p, tokens, args);
 488                 switch (token) {
 489                 case Opt_novrs:
 490                         uopt->novrs = 1;
 491                         break;
 492                 case Opt_bs:
 493                         if (match_int(&args[0], &option))
 494                                 return 0;
 495                         uopt->blocksize = option;
 496                         uopt->flags |= (1 << UDF_FLAG_BLOCKSIZE_SET);
 497                         break;
 498                 case Opt_unhide:
 499                         uopt->flags |= (1 << UDF_FLAG_UNHIDE);
 500                         break;
 501                 case Opt_undelete:
 502                         uopt->flags |= (1 << UDF_FLAG_UNDELETE);
 503                         break;
 504                 case Opt_noadinicb:
 505                         uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
 506                         break;
 507                 case Opt_adinicb:
 508                         uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
 509                         break;
 510                 case Opt_shortad:
 511                         uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
 512                         break;
 513                 case Opt_longad:
 514                         uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
 515                         break;
 516                 case Opt_gid:
 517                         if (match_int(args, &option))
 518                                 return 0;
 519                         uopt->gid = option;
 520                         uopt->flags |= (1 << UDF_FLAG_GID_SET);
 521                         break;
 522                 case Opt_uid:
 523                         if (match_int(args, &option))
 524                                 return 0;
 525                         uopt->uid = option;
 526                         uopt->flags |= (1 << UDF_FLAG_UID_SET);
 527                         break;
 528                 case Opt_umask:
 529                         if (match_octal(args, &option))
 530                                 return 0;
 531                         uopt->umask = option;
 532                         break;
 533                 case Opt_nostrict:
 534                         uopt->flags &= ~(1 << UDF_FLAG_STRICT);
 535                         break;
 536                 case Opt_session:
 537                         if (match_int(args, &option))
 538                                 return 0;
 539                         uopt->session = option;
 540                         if (!remount)
 541                                 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
 542                         break;
 543                 case Opt_lastblock:
 544                         if (match_int(args, &option))
 545                                 return 0;
 546                         uopt->lastblock = option;
 547                         if (!remount)
 548                                 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
 549                         break;
 550                 case Opt_anchor:
 551                         if (match_int(args, &option))
 552                                 return 0;
 553                         uopt->anchor = option;
 554                         break;
 555                 case Opt_volume:
 556                         if (match_int(args, &option))
 557                                 return 0;
 558                         uopt->volume = option;
 559                         break;
 560                 case Opt_partition:
 561                         if (match_int(args, &option))
 562                                 return 0;
 563                         uopt->partition = option;
 564                         break;
 565                 case Opt_fileset:
 566                         if (match_int(args, &option))
 567                                 return 0;
 568                         uopt->fileset = option;
 569                         break;
 570                 case Opt_rootdir:
 571                         if (match_int(args, &option))
 572                                 return 0;
 573                         uopt->rootdir = option;
 574                         break;
 575                 case Opt_utf8:
 576                         uopt->flags |= (1 << UDF_FLAG_UTF8);
 577                         break;
 578 #ifdef CONFIG_UDF_NLS
 579                 case Opt_iocharset:
 580                         uopt->nls_map = load_nls(args[0].from);
 581                         uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
 582                         break;
 583 #endif
 584                 case Opt_uignore:
 585                         uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
 586                         break;
 587                 case Opt_uforget:
 588                         uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
 589                         break;
 590                 case Opt_gignore:
 591                         uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
 592                         break;
 593                 case Opt_gforget:
 594                         uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
 595                         break;
 596                 case Opt_fmode:
 597                         if (match_octal(args, &option))
 598                                 return 0;
 599                         uopt->fmode = option & 0777;
 600                         break;
 601                 case Opt_dmode:
 602                         if (match_octal(args, &option))
 603                                 return 0;
 604                         uopt->dmode = option & 0777;
 605                         break;
 606                 default:
 607                         pr_err("bad mount option \"%s\" or missing value\n", p);
 608                         return 0;
 609                 }
 610         }
 611         return 1;
 612 }
 613
 614 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
 615 {
 616         struct udf_options uopt;
 617         struct udf_sb_info *sbi = UDF_SB(sb);
 618         int error = 0;
 619
 620         uopt.flags = sbi->s_flags;
 621         uopt.uid   = sbi->s_uid;
 622         uopt.gid   = sbi->s_gid;
 623         uopt.umask = sbi->s_umask;
 624         uopt.fmode = sbi->s_fmode;
 625         uopt.dmode = sbi->s_dmode;
 626
 627         if (!udf_parse_options(options, &uopt, true))
 628                 return -EINVAL;
 629
 630         write_lock(&sbi->s_cred_lock);
 631         sbi->s_flags = uopt.flags;
 632         sbi->s_uid   = uopt.uid;
 633         sbi->s_gid   = uopt.gid;
 634         sbi->s_umask = uopt.umask;
 635         sbi->s_fmode = uopt.fmode;
 636         sbi->s_dmode = uopt.dmode;
 637         write_unlock(&sbi->s_cred_lock);
 638
 639         if (sbi->s_lvid_bh) {
 640                 int write_rev = le16_to_cpu(udf_sb_lvidiu(sbi)->minUDFWriteRev);
 641                 if (write_rev > UDF_MAX_WRITE_VERSION)
 642                         *flags |= MS_RDONLY;
 643         }
 644
 645         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 646                 goto out_unlock;
 647
 648         if (*flags & MS_RDONLY)
 649                 udf_close_lvid(sb);
 650         else
 651                 udf_open_lvid(sb);
 652
 653 out_unlock:
 654         return error;
 655 }
 656
 657 /* Check Volume Structure Descriptors (ECMA 167 2/9.1) */
 658 /* We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
 659 static loff_t udf_check_vsd(struct super_block *sb)
 660 {
 661         struct volStructDesc *vsd = NULL;
 662         loff_t sector = 32768;
 663         int sectorsize;
 664         struct buffer_head *bh = NULL;
 665         int nsr02 = 0;
 666         int nsr03 = 0;
 667         struct udf_sb_info *sbi;
 668
 669         sbi = UDF_SB(sb);
 670         if (sb->s_blocksize < sizeof(struct volStructDesc))
 671                 sectorsize = sizeof(struct volStructDesc);
 672         else
 673                 sectorsize = sb->s_blocksize;
 674
 675         sector += (sbi->s_session << sb->s_blocksize_bits);
 676
 677         udf_debug("Starting at sector %u (%ld byte sectors)\n",
 678                   (unsigned int)(sector >> sb->s_blocksize_bits),
 679                   sb->s_blocksize);
 680         /* Process the sequence (if applicable) */
 681         for (; !nsr02 && !nsr03; sector += sectorsize) {
 682                 /* Read a block */
 683                 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
 684                 if (!bh)
 685                         break;
 686
 687                 /* Look for ISO  descriptors */
 688                 vsd = (struct volStructDesc *)(bh->b_data +
 689                                               (sector & (sb->s_blocksize - 1)));
 690
 691                 if (vsd->stdIdent[0] == 0) {
 692                         brelse(bh);
 693                         break;
 694                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
 695                                     VSD_STD_ID_LEN)) {
 696                         switch (vsd->structType) {
 697                         case 0:
 698                                 udf_debug("ISO9660 Boot Record found\n");
 699                                 break;
 700                         case 1:
 701                                 udf_debug("ISO9660 Primary Volume Descriptor found\n");
 702                                 break;
 703                         case 2:
 704                                 udf_debug("ISO9660 Supplementary Volume Descriptor found\n");
 705                                 break;
 706                         case 3:
 707                                 udf_debug("ISO9660 Volume Partition Descriptor found\n");
 708                                 break;
 709                         case 255:
 710                                 udf_debug("ISO9660 Volume Descriptor Set Terminator found\n");
 711                                 break;
 712                         default:
 713                                 udf_debug("ISO9660 VRS (%u) found\n",
 714                                           vsd->structType);
 715                                 break;
 716                         }
 717                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
 718                                     VSD_STD_ID_LEN))
 719                         ; /* nothing */
 720                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
 721                                     VSD_STD_ID_LEN)) {
 722                         brelse(bh);
 723                         break;
 724                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
 725                                     VSD_STD_ID_LEN))
 726                         nsr02 = sector;
 727                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
 728                                     VSD_STD_ID_LEN))
 729                         nsr03 = sector;
 730                 brelse(bh);
 731         }
 732
 733         if (nsr03)
 734                 return nsr03;
 735         else if (nsr02)
 736                 return nsr02;
 737         else if (sector - (sbi->s_session << sb->s_blocksize_bits) == 32768)
 738                 return -1;
 739         else
 740                 return 0;
 741 }
 742
 743 static int udf_find_fileset(struct super_block *sb,
 744                             struct kernel_lb_addr *fileset,
 745                             struct kernel_lb_addr *root)
 746 {
 747         struct buffer_head *bh = NULL;
 748         long lastblock;
 749         uint16_t ident;
 750         struct udf_sb_info *sbi;
 751
 752         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
 753             fileset->partitionReferenceNum != 0xFFFF) {
 754                 bh = udf_read_ptagged(sb, fileset, 0, &ident);
 755
 756                 if (!bh) {
 757                         return 1;
 758                 } else if (ident != TAG_IDENT_FSD) {
 759                         brelse(bh);
 760                         return 1;
 761                 }
 762
 763         }
 764
 765         sbi = UDF_SB(sb);
 766         if (!bh) {
 767                 /* Search backwards through the partitions */
 768                 struct kernel_lb_addr newfileset;
 769
 770 /* --> cvg: FIXME - is it reasonable? */
 771                 return 1;
 772
 773                 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
 774                      (newfileset.partitionReferenceNum != 0xFFFF &&
 775                       fileset->logicalBlockNum == 0xFFFFFFFF &&
 776                       fileset->partitionReferenceNum == 0xFFFF);
 777                      newfileset.partitionReferenceNum--) {
 778                         lastblock = sbi->s_partmaps
 779                                         [newfileset.partitionReferenceNum]
 780                                                 .s_partition_len;
 781                         newfileset.logicalBlockNum = 0;
 782
 783                         do {
 784                                 bh = udf_read_ptagged(sb, &newfileset, 0,
 785                                                       &ident);
 786                                 if (!bh) {
 787                                         newfileset.logicalBlockNum++;
 788                                         continue;
 789                                 }
 790
 791                                 switch (ident) {
 792                                 case TAG_IDENT_SBD:
 793                                 {
 794                                         struct spaceBitmapDesc *sp;
 795                                         sp = (struct spaceBitmapDesc *)
 796                                                                 bh->b_data;
 797                                         newfileset.logicalBlockNum += 1 +
 798                                                 ((le32_to_cpu(sp->numOfBytes) +
 799                                                   sizeof(struct spaceBitmapDesc)
 800                                                   - 1) >> sb->s_blocksize_bits);
 801                                         brelse(bh);
 802                                         break;
 803                                 }
 804                                 case TAG_IDENT_FSD:
 805                                         *fileset = newfileset;
 806                                         break;
 807                                 default:
 808                                         newfileset.logicalBlockNum++;
 809                                         brelse(bh);
 810                                         bh = NULL;
 811                                         break;
 812                                 }
 813                         } while (newfileset.logicalBlockNum < lastblock &&
 814                                  fileset->logicalBlockNum == 0xFFFFFFFF &&
 815                                  fileset->partitionReferenceNum == 0xFFFF);
 816                 }
 817         }
 818
 819         if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
 820              fileset->partitionReferenceNum != 0xFFFF) && bh) {
 821                 udf_debug("Fileset at block=%d, partition=%d\n",
 822                           fileset->logicalBlockNum,
 823                           fileset->partitionReferenceNum);
 824
 825                 sbi->s_partition = fileset->partitionReferenceNum;
 826                 udf_load_fileset(sb, bh, root);
 827                 brelse(bh);
 828                 return 0;
 829         }
 830         return 1;
 831 }
 832
 833 static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
 834 {
 835         struct primaryVolDesc *pvoldesc;
 836         struct ustr *instr, *outstr;
 837         struct buffer_head *bh;
 838         uint16_t ident;
 839         int ret = 1;
 840
 841         instr = kmalloc(sizeof(struct ustr), GFP_NOFS);
 842         if (!instr)
 843                 return 1;
 844
 845         outstr = kmalloc(sizeof(struct ustr), GFP_NOFS);
 846         if (!outstr)
 847                 goto out1;
 848
 849         bh = udf_read_tagged(sb, block, block, &ident);
 850         if (!bh)
 851                 goto out2;
 852
 853         BUG_ON(ident != TAG_IDENT_PVD);
 854
 855         pvoldesc = (struct primaryVolDesc *)bh->b_data;
 856
 857         if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
 858                               pvoldesc->recordingDateAndTime)) {
 859 #ifdef UDFFS_DEBUG
 860                 struct timestamp *ts = &pvoldesc->recordingDateAndTime;
 861                 udf_debug("recording time %04u/%02u/%02u %02u:%02u (%x)\n",
 862                           le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
 863                           ts->minute, le16_to_cpu(ts->typeAndTimezone));
 864 #endif
 865         }
 866
 867         if (!udf_build_ustr(instr, pvoldesc->volIdent, 32))
 868                 if (udf_CS0toUTF8(outstr, instr)) {
 869                         strncpy(UDF_SB(sb)->s_volume_ident, outstr->u_name,
 870                                 outstr->u_len > 31 ? 31 : outstr->u_len);
 871                         udf_debug("volIdent[] = '%s'\n",
 872                                   UDF_SB(sb)->s_volume_ident);
 873                 }
 874
 875         if (!udf_build_ustr(instr, pvoldesc->volSetIdent, 128))
 876                 if (udf_CS0toUTF8(outstr, instr))
 877                         udf_debug("volSetIdent[] = '%s'\n", outstr->u_name);
 878
 879         brelse(bh);
 880         ret = 0;
 881 out2:
 882         kfree(outstr);
 883 out1:
 884         kfree(instr);
 885         return ret;
 886 }
 887
 888 struct inode *udf_find_metadata_inode_efe(struct super_block *sb,
 889                                         u32 meta_file_loc, u32 partition_num)
 890 {
 891         struct kernel_lb_addr addr;
 892         struct inode *metadata_fe;
 893
 894         addr.logicalBlockNum = meta_file_loc;
 895         addr.partitionReferenceNum = partition_num;
 896
 897         metadata_fe = udf_iget(sb, &addr);
 898
 899         if (metadata_fe == NULL)
 900                 udf_warn(sb, "metadata inode efe not found\n");
 901         else if (UDF_I(metadata_fe)->i_alloc_type != ICBTAG_FLAG_AD_SHORT) {
 902                 udf_warn(sb, "metadata inode efe does not have short allocation descriptors!\n");
 903                 iput(metadata_fe);
 904                 metadata_fe = NULL;
 905         }
 906
 907         return metadata_fe;
 908 }
 909
 910 static int udf_load_metadata_files(struct super_block *sb, int partition)
 911 {
 912         struct udf_sb_info *sbi = UDF_SB(sb);
 913         struct udf_part_map *map;
 914         struct udf_meta_data *mdata;
 915         struct kernel_lb_addr addr;
 916
 917         map = &sbi->s_partmaps[partition];
 918         mdata = &map->s_type_specific.s_metadata;
 919
 920         /* metadata address */
 921         udf_debug("Metadata file location: block = %d part = %d\n",
 922                   mdata->s_meta_file_loc, map->s_partition_num);
 923
 924         mdata->s_metadata_fe = udf_find_metadata_inode_efe(sb,
 925                 mdata->s_meta_file_loc, map->s_partition_num);
 926
 927         if (mdata->s_metadata_fe == NULL) {
 928                 /* mirror file entry */
 929                 udf_debug("Mirror metadata file location: block = %d part = %d\n",
 930                           mdata->s_mirror_file_loc, map->s_partition_num);
 931
 932                 mdata->s_mirror_fe = udf_find_metadata_inode_efe(sb,
 933                         mdata->s_mirror_file_loc, map->s_partition_num);
 934
 935                 if (mdata->s_mirror_fe == NULL) {
 936                         udf_err(sb, "Both metadata and mirror metadata inode efe can not found\n");
 937                         goto error_exit;
 938                 }
 939         }
 940
 941         /*
 942          * bitmap file entry
 943          * Note:
 944          * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
 945         */
 946         if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
 947                 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
 948                 addr.partitionReferenceNum = map->s_partition_num;
 949
 950                 udf_debug("Bitmap file location: block = %d part = %d\n",
 951                           addr.logicalBlockNum, addr.partitionReferenceNum);
 952
 953                 mdata->s_bitmap_fe = udf_iget(sb, &addr);
 954
 955                 if (mdata->s_bitmap_fe == NULL) {
 956                         if (sb->s_flags & MS_RDONLY)
 957                                 udf_warn(sb, "bitmap inode efe not found but it's ok since the disc is mounted read-only\n");
 958                         else {
 959                                 udf_err(sb, "bitmap inode efe not found and attempted read-write mount\n");
 960                                 goto error_exit;
 961                         }
 962                 }
 963         }
 964
 965         udf_debug("udf_load_metadata_files Ok\n");
 966
 967         return 0;
 968
 969 error_exit:
 970         return 1;
 971 }
 972
 973 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
 974                              struct kernel_lb_addr *root)
 975 {
 976         struct fileSetDesc *fset;
 977
 978         fset = (struct fileSetDesc *)bh->b_data;
 979
 980         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
 981
 982         UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
 983
 984         udf_debug("Rootdir at block=%d, partition=%d\n",
 985                   root->logicalBlockNum, root->partitionReferenceNum);
 986 }
 987
 988 int udf_compute_nr_groups(struct super_block *sb, u32 partition)
 989 {
 990         struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
 991         return DIV_ROUND_UP(map->s_partition_len +
 992                             (sizeof(struct spaceBitmapDesc) << 3),
 993                             sb->s_blocksize * 8);
 994 }
 995
 996 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
 997 {
 998         struct udf_bitmap *bitmap;
 999         int nr_groups;
1000         int size;
1001
1002         nr_groups = udf_compute_nr_groups(sb, index);
1003         size = sizeof(struct udf_bitmap) +
1004                 (sizeof(struct buffer_head *) * nr_groups);
1005
1006         if (size <= PAGE_SIZE)
1007                 bitmap = kzalloc(size, GFP_KERNEL);
1008         else
1009                 bitmap = vzalloc(size); /* TODO: get rid of vzalloc */
1010
1011         if (bitmap == NULL)
1012                 return NULL;
1013
1014         bitmap->s_block_bitmap = (struct buffer_head **)(bitmap + 1);
1015         bitmap->s_nr_groups = nr_groups;
1016         return bitmap;
1017 }
1018
1019 static int udf_fill_partdesc_info(struct super_block *sb,
1020                 struct partitionDesc *p, int p_index)
1021 {
1022         struct udf_part_map *map;
1023         struct udf_sb_info *sbi = UDF_SB(sb);
1024         struct partitionHeaderDesc *phd;
1025
1026         map = &sbi->s_partmaps[p_index];
1027
1028         map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
1029         map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
1030
1031         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
1032                 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
1033         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
1034                 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
1035         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
1036                 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
1037         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
1038                 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
1039
1040         udf_debug("Partition (%d type %x) starts at physical %d, block length %d\n",
1041                   p_index, map->s_partition_type,
1042                   map->s_partition_root, map->s_partition_len);
1043
1044         if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1045             strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
1046                 return 0;
1047
1048         phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1049         if (phd->unallocSpaceTable.extLength) {
1050                 struct kernel_lb_addr loc = {
1051                         .logicalBlockNum = le32_to_cpu(
1052                                 phd->unallocSpaceTable.extPosition),
1053                         .partitionReferenceNum = p_index,
1054                 };
1055
1056                 map->s_uspace.s_table = udf_iget(sb, &loc);
1057                 if (!map->s_uspace.s_table) {
1058                         udf_debug("cannot load unallocSpaceTable (part %d)\n",
1059                                   p_index);
1060                         return 1;
1061                 }
1062                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1063                 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
1064                           p_index, map->s_uspace.s_table->i_ino);
1065         }
1066
1067         if (phd->unallocSpaceBitmap.extLength) {
1068                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1069                 if (!bitmap)
1070                         return 1;
1071                 map->s_uspace.s_bitmap = bitmap;
1072                 bitmap->s_extLength = le32_to_cpu(
1073                                 phd->unallocSpaceBitmap.extLength);
1074                 bitmap->s_extPosition = le32_to_cpu(
1075                                 phd->unallocSpaceBitmap.extPosition);
1076                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1077                 udf_debug("unallocSpaceBitmap (part %d) @ %d\n",
1078                           p_index, bitmap->s_extPosition);
1079         }
1080
1081         if (phd->partitionIntegrityTable.extLength)
1082                 udf_debug("partitionIntegrityTable (part %d)\n", p_index);
1083
1084         if (phd->freedSpaceTable.extLength) {
1085                 struct kernel_lb_addr loc = {
1086                         .logicalBlockNum = le32_to_cpu(
1087                                 phd->freedSpaceTable.extPosition),
1088                         .partitionReferenceNum = p_index,
1089                 };
1090
1091                 map->s_fspace.s_table = udf_iget(sb, &loc);
1092                 if (!map->s_fspace.s_table) {
1093                         udf_debug("cannot load freedSpaceTable (part %d)\n",
1094                                   p_index);
1095                         return 1;
1096                 }
1097
1098                 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
1099                 udf_debug("freedSpaceTable (part %d) @ %ld\n",
1100                           p_index, map->s_fspace.s_table->i_ino);
1101         }
1102
1103         if (phd->freedSpaceBitmap.extLength) {
1104                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1105                 if (!bitmap)
1106                         return 1;
1107                 map->s_fspace.s_bitmap = bitmap;
1108                 bitmap->s_extLength = le32_to_cpu(
1109                                 phd->freedSpaceBitmap.extLength);
1110                 bitmap->s_extPosition = le32_to_cpu(
1111                                 phd->freedSpaceBitmap.extPosition);
1112                 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1113                 udf_debug("freedSpaceBitmap (part %d) @ %d\n",
1114                           p_index, bitmap->s_extPosition);
1115         }
1116         return 0;
1117 }
1118
1119 static void udf_find_vat_block(struct super_block *sb, int p_index,
1120                                int type1_index, sector_t start_block)
1121 {
1122         struct udf_sb_info *sbi = UDF_SB(sb);
1123         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1124         sector_t vat_block;
1125         struct kernel_lb_addr ino;
1126
1127         /*
1128          * VAT file entry is in the last recorded block. Some broken disks have
1129          * it a few blocks before so try a bit harder...
1130          */
1131         ino.partitionReferenceNum = type1_index;
1132         for (vat_block = start_block;
1133              vat_block >= map->s_partition_root &&
1134              vat_block >= start_block - 3 &&
1135              !sbi->s_vat_inode; vat_block--) {
1136                 ino.logicalBlockNum = vat_block - map->s_partition_root;
1137                 sbi->s_vat_inode = udf_iget(sb, &ino);
1138         }
1139 }
1140
1141 static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1142 {
1143         struct udf_sb_info *sbi = UDF_SB(sb);
1144         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1145         struct buffer_head *bh = NULL;
1146         struct udf_inode_info *vati;
1147         uint32_t pos;
1148         struct virtualAllocationTable20 *vat20;
1149         sector_t blocks = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
1150
1151         udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block);
1152         if (!sbi->s_vat_inode &&
1153             sbi->s_last_block != blocks - 1) {
1154                 pr_notice("Failed to read VAT inode from the last recorded block (%lu), retrying with the last block of the device (%lu).\n",
1155                           (unsigned long)sbi->s_last_block,
1156                           (unsigned long)blocks - 1);
1157                 udf_find_vat_block(sb, p_index, type1_index, blocks - 1);
1158         }
1159         if (!sbi->s_vat_inode)
1160                 return 1;
1161
1162         if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1163                 map->s_type_specific.s_virtual.s_start_offset = 0;
1164                 map->s_type_specific.s_virtual.s_num_entries =
1165                         (sbi->s_vat_inode->i_size - 36) >> 2;
1166         } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1167                 vati = UDF_I(sbi->s_vat_inode);
1168                 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1169                         pos = udf_block_map(sbi->s_vat_inode, 0);
1170                         bh = sb_bread(sb, pos);
1171                         if (!bh)
1172                                 return 1;
1173                         vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1174                 } else {
1175                         vat20 = (struct virtualAllocationTable20 *)
1176                                                         vati->i_ext.i_data;
1177                 }
1178
1179                 map->s_type_specific.s_virtual.s_start_offset =
1180                         le16_to_cpu(vat20->lengthHeader);
1181                 map->s_type_specific.s_virtual.s_num_entries =
1182                         (sbi->s_vat_inode->i_size -
1183                                 map->s_type_specific.s_virtual.
1184                                         s_start_offset) >> 2;
1185                 brelse(bh);
1186         }
1187         return 0;
1188 }
1189
1190 static int udf_load_partdesc(struct super_block *sb, sector_t block)
1191 {
1192         struct buffer_head *bh;
1193         struct partitionDesc *p;
1194         struct udf_part_map *map;
1195         struct udf_sb_info *sbi = UDF_SB(sb);
1196         int i, type1_idx;
1197         uint16_t partitionNumber;
1198         uint16_t ident;
1199         int ret = 0;
1200
1201         bh = udf_read_tagged(sb, block, block, &ident);
1202         if (!bh)
1203                 return 1;
1204         if (ident != TAG_IDENT_PD)
1205                 goto out_bh;
1206
1207         p = (struct partitionDesc *)bh->b_data;
1208         partitionNumber = le16_to_cpu(p->partitionNumber);
1209
1210         /* First scan for TYPE1, SPARABLE and METADATA partitions */
1211         for (i = 0; i < sbi->s_partitions; i++) {
1212                 map = &sbi->s_partmaps[i];
1213                 udf_debug("Searching map: (%d == %d)\n",
1214                           map->s_partition_num, partitionNumber);
1215                 if (map->s_partition_num == partitionNumber &&
1216                     (map->s_partition_type == UDF_TYPE1_MAP15 ||
1217                      map->s_partition_type == UDF_SPARABLE_MAP15))
1218                         break;
1219         }
1220
1221         if (i >= sbi->s_partitions) {
1222                 udf_debug("Partition (%d) not found in partition map\n",
1223                           partitionNumber);
1224                 goto out_bh;
1225         }
1226
1227         ret = udf_fill_partdesc_info(sb, p, i);
1228
1229         /*
1230          * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1231          * PHYSICAL partitions are already set up
1232          */
1233         type1_idx = i;
1234         for (i = 0; i < sbi->s_partitions; i++) {
1235                 map = &sbi->s_partmaps[i];
1236
1237                 if (map->s_partition_num == partitionNumber &&
1238                     (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1239                      map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1240                      map->s_partition_type == UDF_METADATA_MAP25))
1241                         break;
1242         }
1243
1244         if (i >= sbi->s_partitions)
1245                 goto out_bh;
1246
1247         ret = udf_fill_partdesc_info(sb, p, i);
1248         if (ret)
1249                 goto out_bh;
1250
1251         if (map->s_partition_type == UDF_METADATA_MAP25) {
1252                 ret = udf_load_metadata_files(sb, i);
1253                 if (ret) {
1254                         udf_err(sb, "error loading MetaData partition map %d\n",
1255                                 i);
1256                         goto out_bh;
1257                 }
1258         } else {
1259                 ret = udf_load_vat(sb, i, type1_idx);
1260                 if (ret)
1261                         goto out_bh;
1262                 /*
1263                  * Mark filesystem read-only if we have a partition with
1264                  * virtual map since we don't handle writing to it (we
1265                  * overwrite blocks instead of relocating them).
1266                  */
1267                 sb->s_flags |= MS_RDONLY;
1268                 pr_notice("Filesystem marked read-only because writing to pseudooverwrite partition is not implemented\n");
1269         }
1270 out_bh:
1271         /* In case loading failed, we handle cleanup in udf_fill_super */
1272         brelse(bh);
1273         return ret;
1274 }
1275
1276 static int udf_load_sparable_map(struct super_block *sb,
1277                                  struct udf_part_map *map,
1278                                  struct sparablePartitionMap *spm)
1279 {
1280         uint32_t loc;
1281         uint16_t ident;
1282         struct sparingTable *st;
1283         struct udf_sparing_data *sdata = &map->s_type_specific.s_sparing;
1284         int i;
1285         struct buffer_head *bh;
1286
1287         map->s_partition_type = UDF_SPARABLE_MAP15;
1288         sdata->s_packet_len = le16_to_cpu(spm->packetLength);
1289         if (!is_power_of_2(sdata->s_packet_len)) {
1290                 udf_err(sb, "error loading logical volume descriptor: "
1291                         "Invalid packet length %u\n",
1292                         (unsigned)sdata->s_packet_len);
1293                 return -EIO;
1294         }
1295         if (spm->numSparingTables > 4) {
1296                 udf_err(sb, "error loading logical volume descriptor: "
1297                         "Too many sparing tables (%d)\n",
1298                         (int)spm->numSparingTables);
1299                 return -EIO;
1300         }
1301
1302         for (i = 0; i < spm->numSparingTables; i++) {
1303                 loc = le32_to_cpu(spm->locSparingTable[i]);
1304                 bh = udf_read_tagged(sb, loc, loc, &ident);
1305                 if (!bh)
1306                         continue;
1307
1308                 st = (struct sparingTable *)bh->b_data;
1309                 if (ident != 0 ||
1310                     strncmp(st->sparingIdent.ident, UDF_ID_SPARING,
1311                             strlen(UDF_ID_SPARING)) ||
1312                     sizeof(*st) + le16_to_cpu(st->reallocationTableLen) >
1313                                                         sb->s_blocksize) {
1314                         brelse(bh);
1315                         continue;
1316                 }
1317
1318                 sdata->s_spar_map[i] = bh;
1319         }
1320         map->s_partition_func = udf_get_pblock_spar15;
1321         return 0;
1322 }
1323
1324 static int udf_load_logicalvol(struct super_block *sb, sector_t block,
1325                                struct kernel_lb_addr *fileset)
1326 {
1327         struct logicalVolDesc *lvd;
1328         int i, offset;
1329         uint8_t type;
1330         struct udf_sb_info *sbi = UDF_SB(sb);
1331         struct genericPartitionMap *gpm;
1332         uint16_t ident;
1333         struct buffer_head *bh;
1334         unsigned int table_len;
1335         int ret = 0;
1336
1337         bh = udf_read_tagged(sb, block, block, &ident);
1338         if (!bh)
1339                 return 1;
1340         BUG_ON(ident != TAG_IDENT_LVD);
1341         lvd = (struct logicalVolDesc *)bh->b_data;
1342         table_len = le32_to_cpu(lvd->mapTableLength);
1343         if (table_len > sb->s_blocksize - sizeof(*lvd)) {
1344                 udf_err(sb, "error loading logical volume descriptor: "
1345                         "Partition table too long (%u > %lu)\n", table_len,
1346                         sb->s_blocksize - sizeof(*lvd));
1347                 ret = 1;
1348                 goto out_bh;
1349         }
1350
1351         ret = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1352         if (ret)
1353                 goto out_bh;
1354
1355         for (i = 0, offset = 0;
1356              i < sbi->s_partitions && offset < table_len;
1357              i++, offset += gpm->partitionMapLength) {
1358                 struct udf_part_map *map = &sbi->s_partmaps[i];
1359                 gpm = (struct genericPartitionMap *)
1360                                 &(lvd->partitionMaps[offset]);
1361                 type = gpm->partitionMapType;
1362                 if (type == 1) {
1363                         struct genericPartitionMap1 *gpm1 =
1364                                 (struct genericPartitionMap1 *)gpm;
1365                         map->s_partition_type = UDF_TYPE1_MAP15;
1366                         map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1367                         map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1368                         map->s_partition_func = NULL;
1369                 } else if (type == 2) {
1370                         struct udfPartitionMap2 *upm2 =
1371                                                 (struct udfPartitionMap2 *)gpm;
1372                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1373                                                 strlen(UDF_ID_VIRTUAL))) {
1374                                 u16 suf =
1375                                         le16_to_cpu(((__le16 *)upm2->partIdent.
1376                                                         identSuffix)[0]);
1377                                 if (suf < 0x0200) {
1378                                         map->s_partition_type =
1379                                                         UDF_VIRTUAL_MAP15;
1380                                         map->s_partition_func =
1381                                                         udf_get_pblock_virt15;
1382                                 } else {
1383                                         map->s_partition_type =
1384                                                         UDF_VIRTUAL_MAP20;
1385                                         map->s_partition_func =
1386                                                         udf_get_pblock_virt20;
1387                                 }
1388                         } else if (!strncmp(upm2->partIdent.ident,
1389                                                 UDF_ID_SPARABLE,
1390                                                 strlen(UDF_ID_SPARABLE))) {
1391                                 if (udf_load_sparable_map(sb, map,
1392                                     (struct sparablePartitionMap *)gpm) < 0) {
1393                                         ret = 1;
1394                                         goto out_bh;
1395                                 }
1396                         } else if (!strncmp(upm2->partIdent.ident,
1397                                                 UDF_ID_METADATA,
1398                                                 strlen(UDF_ID_METADATA))) {
1399                                 struct udf_meta_data *mdata =
1400                                         &map->s_type_specific.s_metadata;
1401                                 struct metadataPartitionMap *mdm =
1402                                                 (struct metadataPartitionMap *)
1403                                                 &(lvd->partitionMaps[offset]);
1404                                 udf_debug("Parsing Logical vol part %d type %d  id=%s\n",
1405                                           i, type, UDF_ID_METADATA);
1406
1407                                 map->s_partition_type = UDF_METADATA_MAP25;
1408                                 map->s_partition_func = udf_get_pblock_meta25;
1409
1410                                 mdata->s_meta_file_loc   =
1411                                         le32_to_cpu(mdm->metadataFileLoc);
1412                                 mdata->s_mirror_file_loc =
1413                                         le32_to_cpu(mdm->metadataMirrorFileLoc);
1414                                 mdata->s_bitmap_file_loc =
1415                                         le32_to_cpu(mdm->metadataBitmapFileLoc);
1416                                 mdata->s_alloc_unit_size =
1417                                         le32_to_cpu(mdm->allocUnitSize);
1418                                 mdata->s_align_unit_size =
1419                                         le16_to_cpu(mdm->alignUnitSize);
1420                                 if (mdm->flags & 0x01)
1421                                         mdata->s_flags |= MF_DUPLICATE_MD;
1422
1423                                 udf_debug("Metadata Ident suffix=0x%x\n",
1424                                           le16_to_cpu(*(__le16 *)
1425                                                       mdm->partIdent.identSuffix));
1426                                 udf_debug("Metadata part num=%d\n",
1427                                           le16_to_cpu(mdm->partitionNum));
1428                                 udf_debug("Metadata part alloc unit size=%d\n",
1429                                           le32_to_cpu(mdm->allocUnitSize));
1430                                 udf_debug("Metadata file loc=%d\n",
1431                                           le32_to_cpu(mdm->metadataFileLoc));
1432                                 udf_debug("Mirror file loc=%d\n",
1433                                           le32_to_cpu(mdm->metadataMirrorFileLoc));
1434                                 udf_debug("Bitmap file loc=%d\n",
1435                                           le32_to_cpu(mdm->metadataBitmapFileLoc));
1436                                 udf_debug("Flags: %d %d\n",
1437                                           mdata->s_flags, mdm->flags);
1438                         } else {
1439                                 udf_debug("Unknown ident: %s\n",
1440                                           upm2->partIdent.ident);
1441                                 continue;
1442                         }
1443                         map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1444                         map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1445                 }
1446                 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1447                           i, map->s_partition_num, type, map->s_volumeseqnum);
1448         }
1449
1450         if (fileset) {
1451                 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
1452
1453                 *fileset = lelb_to_cpu(la->extLocation);
1454                 udf_debug("FileSet found in LogicalVolDesc at block=%d, partition=%d\n",
1455                           fileset->logicalBlockNum,
1456                           fileset->partitionReferenceNum);
1457         }
1458         if (lvd->integritySeqExt.extLength)
1459                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1460
1461 out_bh:
1462         brelse(bh);
1463         return ret;
1464 }
1465
1466 /*
1467  * udf_load_logicalvolint
1468  *
1469  */
1470 static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
1471 {
1472         struct buffer_head *bh = NULL;
1473         uint16_t ident;
1474         struct udf_sb_info *sbi = UDF_SB(sb);
1475         struct logicalVolIntegrityDesc *lvid;
1476
1477         while (loc.extLength > 0 &&
1478                (bh = udf_read_tagged(sb, loc.extLocation,
1479                                      loc.extLocation, &ident)) &&
1480                ident == TAG_IDENT_LVID) {
1481                 sbi->s_lvid_bh = bh;
1482                 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1483
1484                 if (lvid->nextIntegrityExt.extLength)
1485                         udf_load_logicalvolint(sb,
1486                                 leea_to_cpu(lvid->nextIntegrityExt));
1487
1488                 if (sbi->s_lvid_bh != bh)
1489                         brelse(bh);
1490                 loc.extLength -= sb->s_blocksize;
1491                 loc.extLocation++;
1492         }
1493         if (sbi->s_lvid_bh != bh)
1494                 brelse(bh);
1495 }
1496
1497 /*
1498  * udf_process_sequence
1499  *
1500  * PURPOSE
1501  *      Process a main/reserve volume descriptor sequence.
1502  *
1503  * PRE-CONDITIONS
1504  *      sb                      Pointer to _locked_ superblock.
1505  *      block                   First block of first extent of the sequence.
1506  *      lastblock               Lastblock of first extent of the sequence.
1507  *
1508  * HISTORY
1509  *      July 1, 1997 - Andrew E. Mileski
1510  *      Written, tested, and released.
1511  */
1512 static noinline int udf_process_sequence(struct super_block *sb, long block,
1513                                 long lastblock, struct kernel_lb_addr *fileset)
1514 {
1515         struct buffer_head *bh = NULL;
1516         struct udf_vds_record vds[VDS_POS_LENGTH];
1517         struct udf_vds_record *curr;
1518         struct generic_desc *gd;
1519         struct volDescPtr *vdp;
1520         int done = 0;
1521         uint32_t vdsn;
1522         uint16_t ident;
1523         long next_s = 0, next_e = 0;
1524
1525         memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1526
1527         /*
1528          * Read the main descriptor sequence and find which descriptors
1529          * are in it.
1530          */
1531         for (; (!done && block <= lastblock); block++) {
1532
1533                 bh = udf_read_tagged(sb, block, block, &ident);
1534                 if (!bh) {
1535                         udf_err(sb,
1536                                 "Block %llu of volume descriptor sequence is corrupted or we could not read it\n",
1537                                 (unsigned long long)block);
1538                         return 1;
1539                 }
1540
1541                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1542                 gd = (struct generic_desc *)bh->b_data;
1543                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1544                 switch (ident) {
1545                 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1546                         curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1547                         if (vdsn >= curr->volDescSeqNum) {
1548                                 curr->volDescSeqNum = vdsn;
1549                                 curr->block = block;
1550                         }
1551                         break;
1552                 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1553                         curr = &vds[VDS_POS_VOL_DESC_PTR];
1554                         if (vdsn >= curr->volDescSeqNum) {
1555                                 curr->volDescSeqNum = vdsn;
1556                                 curr->block = block;
1557
1558                                 vdp = (struct volDescPtr *)bh->b_data;
1559                                 next_s = le32_to_cpu(
1560                                         vdp->nextVolDescSeqExt.extLocation);
1561                                 next_e = le32_to_cpu(
1562                                         vdp->nextVolDescSeqExt.extLength);
1563                                 next_e = next_e >> sb->s_blocksize_bits;
1564                                 next_e += next_s;
1565                         }
1566                         break;
1567                 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1568                         curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1569                         if (vdsn >= curr->volDescSeqNum) {
1570                                 curr->volDescSeqNum = vdsn;
1571                                 curr->block = block;
1572                         }
1573                         break;
1574                 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1575                         curr = &vds[VDS_POS_PARTITION_DESC];
1576                         if (!curr->block)
1577                                 curr->block = block;
1578                         break;
1579                 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1580                         curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1581                         if (vdsn >= curr->volDescSeqNum) {
1582                                 curr->volDescSeqNum = vdsn;
1583                                 curr->block = block;
1584                         }
1585                         break;
1586                 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1587                         curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1588                         if (vdsn >= curr->volDescSeqNum) {
1589                                 curr->volDescSeqNum = vdsn;
1590                                 curr->block = block;
1591                         }
1592                         break;
1593                 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1594                         vds[VDS_POS_TERMINATING_DESC].block = block;
1595                         if (next_e) {
1596                                 block = next_s;
1597                                 lastblock = next_e;
1598                                 next_s = next_e = 0;
1599                         } else
1600                                 done = 1;
1601                         break;
1602                 }
1603                 brelse(bh);
1604         }
1605         /*
1606          * Now read interesting descriptors again and process them
1607          * in a suitable order
1608          */
1609         if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1610                 udf_err(sb, "Primary Volume Descriptor not found!\n");
1611                 return 1;
1612         }
1613         if (udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block))
1614                 return 1;
1615
1616         if (vds[VDS_POS_LOGICAL_VOL_DESC].block && udf_load_logicalvol(sb,
1617             vds[VDS_POS_LOGICAL_VOL_DESC].block, fileset))
1618                 return 1;
1619
1620         if (vds[VDS_POS_PARTITION_DESC].block) {
1621                 /*
1622                  * We rescan the whole descriptor sequence to find
1623                  * partition descriptor blocks and process them.
1624                  */
1625                 for (block = vds[VDS_POS_PARTITION_DESC].block;
1626                      block < vds[VDS_POS_TERMINATING_DESC].block;
1627                      block++)
1628                         if (udf_load_partdesc(sb, block))
1629                                 return 1;
1630         }
1631
1632         return 0;
1633 }
1634
1635 static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh,
1636                              struct kernel_lb_addr *fileset)
1637 {
1638         struct anchorVolDescPtr *anchor;
1639         long main_s, main_e, reserve_s, reserve_e;
1640
1641         anchor = (struct anchorVolDescPtr *)bh->b_data;
1642
1643         /* Locate the main sequence */
1644         main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1645         main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1646         main_e = main_e >> sb->s_blocksize_bits;
1647         main_e += main_s;
1648
1649         /* Locate the reserve sequence */
1650         reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1651         reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1652         reserve_e = reserve_e >> sb->s_blocksize_bits;
1653         reserve_e += reserve_s;
1654
1655         /* Process the main & reserve sequences */
1656         /* responsible for finding the PartitionDesc(s) */
1657         if (!udf_process_sequence(sb, main_s, main_e, fileset))
1658                 return 1;
1659         udf_sb_free_partitions(sb);
1660         if (!udf_process_sequence(sb, reserve_s, reserve_e, fileset))
1661                 return 1;
1662         udf_sb_free_partitions(sb);
1663         return 0;
1664 }
1665
1666 /*
1667  * Check whether there is an anchor block in the given block and
1668  * load Volume Descriptor Sequence if so.
1669  */
1670 static int udf_check_anchor_block(struct super_block *sb, sector_t block,
1671                                   struct kernel_lb_addr *fileset)
1672 {
1673         struct buffer_head *bh;
1674         uint16_t ident;
1675         int ret;
1676
1677         if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
1678             udf_fixed_to_variable(block) >=
1679             sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits)
1680                 return 0;
1681
1682         bh = udf_read_tagged(sb, block, block, &ident);
1683         if (!bh)
1684                 return 0;
1685         if (ident != TAG_IDENT_AVDP) {
1686                 brelse(bh);
1687                 return 0;
1688         }
1689         ret = udf_load_sequence(sb, bh, fileset);
1690         brelse(bh);
1691         return ret;
1692 }
1693
1694 /* Search for an anchor volume descriptor pointer */
1695 static sector_t udf_scan_anchors(struct super_block *sb, sector_t lastblock,
1696                                  struct kernel_lb_addr *fileset)
1697 {
1698         sector_t last[6];
1699         int i;
1700         struct udf_sb_info *sbi = UDF_SB(sb);
1701         int last_count = 0;
1702
1703         /* First try user provided anchor */
1704         if (sbi->s_anchor) {
1705                 if (udf_check_anchor_block(sb, sbi->s_anchor, fileset))
1706                         return lastblock;
1707         }
1708         /*
1709          * according to spec, anchor is in either:
1710          *     block 256
1711          *     lastblock-256
1712          *     lastblock
1713          *  however, if the disc isn't closed, it could be 512.
1714          */
1715         if (udf_check_anchor_block(sb, sbi->s_session + 256, fileset))
1716                 return lastblock;
1717         /*
1718          * The trouble is which block is the last one. Drives often misreport
1719          * this so we try various possibilities.
1720          */
1721         last[last_count++] = lastblock;
1722         if (lastblock >= 1)
1723                 last[last_count++] = lastblock - 1;
1724         last[last_count++] = lastblock + 1;
1725         if (lastblock >= 2)
1726                 last[last_count++] = lastblock - 2;
1727         if (lastblock >= 150)
1728                 last[last_count++] = lastblock - 150;
1729         if (lastblock >= 152)
1730                 last[last_count++] = lastblock - 152;
1731
1732         for (i = 0; i < last_count; i++) {
1733                 if (last[i] >= sb->s_bdev->bd_inode->i_size >>
1734                                 sb->s_blocksize_bits)
1735                         continue;
1736                 if (udf_check_anchor_block(sb, last[i], fileset))
1737                         return last[i];
1738                 if (last[i] < 256)
1739                         continue;
1740                 if (udf_check_anchor_block(sb, last[i] - 256, fileset))
1741                         return last[i];
1742         }
1743
1744         /* Finally try block 512 in case media is open */
1745         if (udf_check_anchor_block(sb, sbi->s_session + 512, fileset))
1746                 return last[0];
1747         return 0;
1748 }
1749
1750 /*
1751  * Find an anchor volume descriptor and load Volume Descriptor Sequence from
1752  * area specified by it. The function expects sbi->s_lastblock to be the last
1753  * block on the media.
1754  *
1755  * Return 1 if ok, 0 if not found.
1756  *
1757  */
1758 static int udf_find_anchor(struct super_block *sb,
1759                            struct kernel_lb_addr *fileset)
1760 {
1761         sector_t lastblock;
1762         struct udf_sb_info *sbi = UDF_SB(sb);
1763
1764         lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1765         if (lastblock)
1766                 goto out;
1767
1768         /* No anchor found? Try VARCONV conversion of block numbers */
1769         UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
1770         /* Firstly, we try to not convert number of the last block */
1771         lastblock = udf_scan_anchors(sb,
1772                                 udf_variable_to_fixed(sbi->s_last_block),
1773                                 fileset);
1774         if (lastblock)
1775                 goto out;
1776
1777         /* Secondly, we try with converted number of the last block */
1778         lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1779         if (!lastblock) {
1780                 /* VARCONV didn't help. Clear it. */
1781                 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
1782                 return 0;
1783         }
1784 out:
1785         sbi->s_last_block = lastblock;
1786         return 1;
1787 }
1788
1789 /*
1790  * Check Volume Structure Descriptor, find Anchor block and load Volume
1791  * Descriptor Sequence
1792  */
1793 static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
1794                         int silent, struct kernel_lb_addr *fileset)
1795 {
1796         struct udf_sb_info *sbi = UDF_SB(sb);
1797         loff_t nsr_off;
1798
1799         if (!sb_set_blocksize(sb, uopt->blocksize)) {
1800                 if (!silent)
1801                         udf_warn(sb, "Bad block size\n");
1802                 return 0;
1803         }
1804         sbi->s_last_block = uopt->lastblock;
1805         if (!uopt->novrs) {
1806                 /* Check that it is NSR02 compliant */
1807                 nsr_off = udf_check_vsd(sb);
1808                 if (!nsr_off) {
1809                         if (!silent)
1810                                 udf_warn(sb, "No VRS found\n");
1811                         return 0;
1812                 }
1813                 if (nsr_off == -1)
1814                         udf_debug("Failed to read byte 32768. Assuming open disc. Skipping validity check\n");
1815                 if (!sbi->s_last_block)
1816                         sbi->s_last_block = udf_get_last_block(sb);
1817         } else {
1818                 udf_debug("Validity check skipped because of novrs option\n");
1819         }
1820
1821         /* Look for anchor block and load Volume Descriptor Sequence */
1822         sbi->s_anchor = uopt->anchor;
1823         if (!udf_find_anchor(sb, fileset)) {
1824                 if (!silent)
1825                         udf_warn(sb, "No anchor found\n");
1826                 return 0;
1827         }
1828         return 1;
1829 }
1830
1831 static void udf_open_lvid(struct super_block *sb)
1832 {
1833         struct udf_sb_info *sbi = UDF_SB(sb);
1834         struct buffer_head *bh = sbi->s_lvid_bh;
1835         struct logicalVolIntegrityDesc *lvid;
1836         struct logicalVolIntegrityDescImpUse *lvidiu;
1837
1838         if (!bh)
1839                 return;
1840
1841         mutex_lock(&sbi->s_alloc_mutex);
1842         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1843         lvidiu = udf_sb_lvidiu(sbi);
1844
1845         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1846         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1847         udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
1848                                 CURRENT_TIME);
1849         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN);
1850
1851         lvid->descTag.descCRC = cpu_to_le16(
1852                 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1853                         le16_to_cpu(lvid->descTag.descCRCLength)));
1854
1855         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1856         mark_buffer_dirty(bh);
1857         sbi->s_lvid_dirty = 0;
1858         mutex_unlock(&sbi->s_alloc_mutex);
1859 }
1860
1861 static void udf_close_lvid(struct super_block *sb)
1862 {
1863         struct udf_sb_info *sbi = UDF_SB(sb);
1864         struct buffer_head *bh = sbi->s_lvid_bh;
1865         struct logicalVolIntegrityDesc *lvid;
1866         struct logicalVolIntegrityDescImpUse *lvidiu;
1867
1868         if (!bh)
1869                 return;
1870
1871         mutex_lock(&sbi->s_alloc_mutex);
1872         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1873         lvidiu = udf_sb_lvidiu(sbi);
1874         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1875         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1876         udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
1877         if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1878                 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1879         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1880                 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1881         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
1882                 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
1883         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1884
1885         lvid->descTag.descCRC = cpu_to_le16(
1886                         crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1887                                 le16_to_cpu(lvid->descTag.descCRCLength)));
1888
1889         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1890         /*
1891          * We set buffer uptodate unconditionally here to avoid spurious
1892          * warnings from mark_buffer_dirty() when previous EIO has marked
1893          * the buffer as !uptodate
1894          */
1895         set_buffer_uptodate(bh);
1896         mark_buffer_dirty(bh);
1897         sbi->s_lvid_dirty = 0;
1898         mutex_unlock(&sbi->s_alloc_mutex);
1899 }
1900
1901 u64 lvid_get_unique_id(struct super_block *sb)
1902 {
1903         struct buffer_head *bh;
1904         struct udf_sb_info *sbi = UDF_SB(sb);
1905         struct logicalVolIntegrityDesc *lvid;
1906         struct logicalVolHeaderDesc *lvhd;
1907         u64 uniqueID;
1908         u64 ret;
1909
1910         bh = sbi->s_lvid_bh;
1911         if (!bh)
1912                 return 0;
1913
1914         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1915         lvhd = (struct logicalVolHeaderDesc *)lvid->logicalVolContentsUse;
1916
1917         mutex_lock(&sbi->s_alloc_mutex);
1918         ret = uniqueID = le64_to_cpu(lvhd->uniqueID);
1919         if (!(++uniqueID & 0xFFFFFFFF))
1920                 uniqueID += 16;
1921         lvhd->uniqueID = cpu_to_le64(uniqueID);
1922         mutex_unlock(&sbi->s_alloc_mutex);
1923         mark_buffer_dirty(bh);
1924
1925         return ret;
1926 }
1927
1928 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1929 {
1930         int ret;
1931         struct inode *inode = NULL;
1932         struct udf_options uopt;
1933         struct kernel_lb_addr rootdir, fileset;
1934         struct udf_sb_info *sbi;
1935
1936         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1937         uopt.uid = -1;
1938         uopt.gid = -1;
1939         uopt.umask = 0;
1940         uopt.fmode = UDF_INVALID_MODE;
1941         uopt.dmode = UDF_INVALID_MODE;
1942
1943         sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1944         if (!sbi)
1945                 return -ENOMEM;
1946
1947         sb->s_fs_info = sbi;
1948
1949         mutex_init(&sbi->s_alloc_mutex);
1950
1951         if (!udf_parse_options((char *)options, &uopt, false))
1952                 goto error_out;
1953
1954         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1955             uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
1956                 udf_err(sb, "utf8 cannot be combined with iocharset\n");
1957                 goto error_out;
1958         }
1959 #ifdef CONFIG_UDF_NLS
1960         if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1961                 uopt.nls_map = load_nls_default();
1962                 if (!uopt.nls_map)
1963                         uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1964                 else
1965                         udf_debug("Using default NLS map\n");
1966         }
1967 #endif
1968         if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1969                 uopt.flags |= (1 << UDF_FLAG_UTF8);
1970
1971         fileset.logicalBlockNum = 0xFFFFFFFF;
1972         fileset.partitionReferenceNum = 0xFFFF;
1973
1974         sbi->s_flags = uopt.flags;
1975         sbi->s_uid = uopt.uid;
1976         sbi->s_gid = uopt.gid;
1977         sbi->s_umask = uopt.umask;
1978         sbi->s_fmode = uopt.fmode;
1979         sbi->s_dmode = uopt.dmode;
1980         sbi->s_nls_map = uopt.nls_map;
1981         rwlock_init(&sbi->s_cred_lock);
1982
1983         if (uopt.session == 0xFFFFFFFF)
1984                 sbi->s_session = udf_get_last_session(sb);
1985         else
1986                 sbi->s_session = uopt.session;
1987
1988         udf_debug("Multi-session=%d\n", sbi->s_session);
1989
1990         /* Fill in the rest of the superblock */
1991         sb->s_op = &udf_sb_ops;
1992         sb->s_export_op = &udf_export_ops;
1993
1994         sb->s_magic = UDF_SUPER_MAGIC;
1995         sb->s_time_gran = 1000;
1996
1997         if (uopt.flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) {
1998                 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1999         } else {
2000                 uopt.blocksize = bdev_logical_block_size(sb->s_bdev);
2001                 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
2002                 if (!ret && uopt.blocksize != UDF_DEFAULT_BLOCKSIZE) {
2003                         if (!silent)
2004                                 pr_notice("Rescanning with blocksize %d\n",
2005                                           UDF_DEFAULT_BLOCKSIZE);
2006                         brelse(sbi->s_lvid_bh);
2007                         sbi->s_lvid_bh = NULL;
2008                         uopt.blocksize = UDF_DEFAULT_BLOCKSIZE;
2009                         ret = udf_load_vrs(sb, &uopt, silent, &fileset);
2010                 }
2011         }
2012         if (!ret) {
2013                 udf_warn(sb, "No partition found (1)\n");
2014                 goto error_out;
2015         }
2016
2017         udf_debug("Lastblock=%d\n", sbi->s_last_block);
2018
2019         if (sbi->s_lvid_bh) {
2020                 struct logicalVolIntegrityDescImpUse *lvidiu =
2021                                                         udf_sb_lvidiu(sbi);
2022                 uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
2023                 uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
2024                 /* uint16_t maxUDFWriteRev =
2025                                 le16_to_cpu(lvidiu->maxUDFWriteRev); */
2026
2027                 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
2028                         udf_err(sb, "minUDFReadRev=%x (max is %x)\n",
2029                                 le16_to_cpu(lvidiu->minUDFReadRev),
2030                                 UDF_MAX_READ_VERSION);
2031                         goto error_out;
2032                 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
2033                         sb->s_flags |= MS_RDONLY;
2034
2035                 sbi->s_udfrev = minUDFWriteRev;
2036
2037                 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
2038                         UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
2039                 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
2040                         UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
2041         }
2042
2043         if (!sbi->s_partitions) {
2044                 udf_warn(sb, "No partition found (2)\n");
2045                 goto error_out;
2046         }
2047
2048         if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
2049                         UDF_PART_FLAG_READ_ONLY) {
2050                 pr_notice("Partition marked readonly; forcing readonly mount\n");
2051                 sb->s_flags |= MS_RDONLY;
2052         }
2053
2054         if (udf_find_fileset(sb, &fileset, &rootdir)) {
2055                 udf_warn(sb, "No fileset found\n");
2056                 goto error_out;
2057         }
2058
2059         if (!silent) {
2060                 struct timestamp ts;
2061                 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
2062                 udf_info("Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
2063                          sbi->s_volume_ident,
2064                          le16_to_cpu(ts.year), ts.month, ts.day,
2065                          ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
2066         }
2067         if (!(sb->s_flags & MS_RDONLY))
2068                 udf_open_lvid(sb);
2069
2070         /* Assign the root inode */
2071         /* assign inodes by physical block number */
2072         /* perhaps it's not extensible enough, but for now ... */
2073         inode = udf_iget(sb, &rootdir);
2074         if (!inode) {
2075                 udf_err(sb, "Error in udf_iget, block=%d, partition=%d\n",
2076                        rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
2077                 goto error_out;
2078         }
2079
2080         /* Allocate a dentry for the root inode */
2081         sb->s_root = d_make_root(inode);
2082         if (!sb->s_root) {
2083                 udf_err(sb, "Couldn't allocate root dentry\n");
2084                 goto error_out;
2085         }
2086         sb->s_maxbytes = MAX_LFS_FILESIZE;
2087         sb->s_max_links = UDF_MAX_LINKS;
2088         return 0;
2089
2090 error_out:
2091         if (sbi->s_vat_inode)
2092                 iput(sbi->s_vat_inode);
2093 #ifdef CONFIG_UDF_NLS
2094         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2095                 unload_nls(sbi->s_nls_map);
2096 #endif
2097         if (!(sb->s_flags & MS_RDONLY))
2098                 udf_close_lvid(sb);
2099         brelse(sbi->s_lvid_bh);
2100         udf_sb_free_partitions(sb);
2101         kfree(sbi);
2102         sb->s_fs_info = NULL;
2103
2104         return -EINVAL;
2105 }
2106
2107 void _udf_err(struct super_block *sb, const char *function,
2108               const char *fmt, ...)
2109 {
2110         struct va_format vaf;
2111         va_list args;
2112
2113         va_start(args, fmt);
2114
2115         vaf.fmt = fmt;
2116         vaf.va = &args;
2117
2118         pr_err("error (device %s): %s: %pV", sb->s_id, function, &vaf);
2119
2120         va_end(args);
2121 }
2122
2123 void _udf_warn(struct super_block *sb, const char *function,
2124                const char *fmt, ...)
2125 {
2126         struct va_format vaf;
2127         va_list args;
2128
2129         va_start(args, fmt);
2130
2131         vaf.fmt = fmt;
2132         vaf.va = &args;
2133
2134         pr_warn("warning (device %s): %s: %pV", sb->s_id, function, &vaf);
2135
2136         va_end(args);
2137 }
2138
2139 static void udf_put_super(struct super_block *sb)
2140 {
2141         struct udf_sb_info *sbi;
2142
2143         sbi = UDF_SB(sb);
2144
2145         if (sbi->s_vat_inode)
2146                 iput(sbi->s_vat_inode);
2147 #ifdef CONFIG_UDF_NLS
2148         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2149                 unload_nls(sbi->s_nls_map);
2150 #endif
2151         if (!(sb->s_flags & MS_RDONLY))
2152                 udf_close_lvid(sb);
2153         brelse(sbi->s_lvid_bh);
2154         udf_sb_free_partitions(sb);
2155         kfree(sb->s_fs_info);
2156         sb->s_fs_info = NULL;
2157 }
2158
2159 static int udf_sync_fs(struct super_block *sb, int wait)
2160 {
2161         struct udf_sb_info *sbi = UDF_SB(sb);
2162
2163         mutex_lock(&sbi->s_alloc_mutex);
2164         if (sbi->s_lvid_dirty) {
2165                 /*
2166                  * Blockdevice will be synced later so we don't have to submit
2167                  * the buffer for IO
2168                  */
2169                 mark_buffer_dirty(sbi->s_lvid_bh);
2170                 sbi->s_lvid_dirty = 0;
2171         }
2172         mutex_unlock(&sbi->s_alloc_mutex);
2173
2174         return 0;
2175 }
2176
2177 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
2178 {
2179         struct super_block *sb = dentry->d_sb;
2180         struct udf_sb_info *sbi = UDF_SB(sb);
2181         struct logicalVolIntegrityDescImpUse *lvidiu;
2182         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
2183
2184         if (sbi->s_lvid_bh != NULL)
2185                 lvidiu = udf_sb_lvidiu(sbi);
2186         else
2187                 lvidiu = NULL;
2188
2189         buf->f_type = UDF_SUPER_MAGIC;
2190         buf->f_bsize = sb->s_blocksize;
2191         buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
2192         buf->f_bfree = udf_count_free(sb);
2193         buf->f_bavail = buf->f_bfree;
2194         buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2195                                           le32_to_cpu(lvidiu->numDirs)) : 0)
2196                         + buf->f_bfree;
2197         buf->f_ffree = buf->f_bfree;
2198         buf->f_namelen = UDF_NAME_LEN - 2;
2199         buf->f_fsid.val[0] = (u32)id;
2200         buf->f_fsid.val[1] = (u32)(id >> 32);
2201
2202         return 0;
2203 }
2204
2205 static unsigned int udf_count_free_bitmap(struct super_block *sb,
2206                                           struct udf_bitmap *bitmap)
2207 {
2208         struct buffer_head *bh = NULL;
2209         unsigned int accum = 0;
2210         int index;
2211         int block = 0, newblock;
2212         struct kernel_lb_addr loc;
2213         uint32_t bytes;
2214         uint8_t *ptr;
2215         uint16_t ident;
2216         struct spaceBitmapDesc *bm;
2217
2218         loc.logicalBlockNum = bitmap->s_extPosition;
2219         loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
2220         bh = udf_read_ptagged(sb, &loc, 0, &ident);
2221
2222         if (!bh) {
2223                 udf_err(sb, "udf_count_free failed\n");
2224                 goto out;
2225         } else if (ident != TAG_IDENT_SBD) {
2226                 brelse(bh);
2227                 udf_err(sb, "udf_count_free failed\n");
2228                 goto out;
2229         }
2230
2231         bm = (struct spaceBitmapDesc *)bh->b_data;
2232         bytes = le32_to_cpu(bm->numOfBytes);
2233         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2234         ptr = (uint8_t *)bh->b_data;
2235
2236         while (bytes > 0) {
2237                 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2238                 accum += bitmap_weight((const unsigned long *)(ptr + index),
2239                                         cur_bytes * 8);
2240                 bytes -= cur_bytes;
2241                 if (bytes) {
2242                         brelse(bh);
2243                         newblock = udf_get_lb_pblock(sb, &loc, ++block);
2244                         bh = udf_tread(sb, newblock);
2245                         if (!bh) {
2246                                 udf_debug("read failed\n");
2247                                 goto out;
2248                         }
2249                         index = 0;
2250                         ptr = (uint8_t *)bh->b_data;
2251                 }
2252         }
2253         brelse(bh);
2254 out:
2255         return accum;
2256 }
2257
2258 static unsigned int udf_count_free_table(struct super_block *sb,
2259                                          struct inode *table)
2260 {
2261         unsigned int accum = 0;
2262         uint32_t elen;
2263         struct kernel_lb_addr eloc;
2264         int8_t etype;
2265         struct extent_position epos;
2266
2267         mutex_lock(&UDF_SB(sb)->s_alloc_mutex);
2268         epos.block = UDF_I(table)->i_location;
2269         epos.offset = sizeof(struct unallocSpaceEntry);
2270         epos.bh = NULL;
2271
2272         while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2273                 accum += (elen >> table->i_sb->s_blocksize_bits);
2274
2275         brelse(epos.bh);
2276         mutex_unlock(&UDF_SB(sb)->s_alloc_mutex);
2277
2278         return accum;
2279 }
2280
2281 static unsigned int udf_count_free(struct super_block *sb)
2282 {
2283         unsigned int accum = 0;
2284         struct udf_sb_info *sbi;
2285         struct udf_part_map *map;
2286
2287         sbi = UDF_SB(sb);
2288         if (sbi->s_lvid_bh) {
2289                 struct logicalVolIntegrityDesc *lvid =
2290                         (struct logicalVolIntegrityDesc *)
2291                         sbi->s_lvid_bh->b_data;
2292                 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
2293                         accum = le32_to_cpu(
2294                                         lvid->freeSpaceTable[sbi->s_partition]);
2295                         if (accum == 0xFFFFFFFF)
2296                                 accum = 0;
2297                 }
2298         }
2299
2300         if (accum)
2301                 return accum;
2302
2303         map = &sbi->s_partmaps[sbi->s_partition];
2304         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2305                 accum += udf_count_free_bitmap(sb,
2306                                                map->s_uspace.s_bitmap);
2307         }
2308         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
2309                 accum += udf_count_free_bitmap(sb,
2310                                                map->s_fspace.s_bitmap);
2311         }
2312         if (accum)
2313                 return accum;
2314
2315         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2316                 accum += udf_count_free_table(sb,
2317                                               map->s_uspace.s_table);
2318         }
2319         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
2320                 accum += udf_count_free_table(sb,
2321                                               map->s_fspace.s_table);
2322         }
2323
2324         return accum;
2325 }