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 #define VSD_FIRST_SECTOR_OFFSET         32768
  80 #define VSD_MAX_SECTOR_OFFSET           0x800000
  81
  82 enum { UDF_MAX_LINKS = 0xffff };
  83
  84 /* These are the "meat" - everything else is stuffing */
  85 static int udf_fill_super(struct super_block *, void *, int);
  86 static void udf_put_super(struct super_block *);
  87 static int udf_sync_fs(struct super_block *, int);
  88 static int udf_remount_fs(struct super_block *, int *, char *);
  89 static void udf_load_logicalvolint(struct super_block *, struct kernel_extent_ad);
  90 static int udf_find_fileset(struct super_block *, struct kernel_lb_addr *,
  91                             struct kernel_lb_addr *);
  92 static void udf_load_fileset(struct super_block *, struct buffer_head *,
  93                              struct kernel_lb_addr *);
  94 static void udf_open_lvid(struct super_block *);
  95 static void udf_close_lvid(struct super_block *);
  96 static unsigned int udf_count_free(struct super_block *);
  97 static int udf_statfs(struct dentry *, struct kstatfs *);
  98 static int udf_show_options(struct seq_file *, struct dentry *);
  99
 100 struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct super_block *sb)
 101 {
 102         struct logicalVolIntegrityDesc *lvid;
 103         unsigned int partnum;
 104         unsigned int offset;
 105
 106         if (!UDF_SB(sb)->s_lvid_bh)
 107                 return NULL;
 108         lvid = (struct logicalVolIntegrityDesc *)UDF_SB(sb)->s_lvid_bh->b_data;
 109         partnum = le32_to_cpu(lvid->numOfPartitions);
 110         if ((sb->s_blocksize - sizeof(struct logicalVolIntegrityDescImpUse) -
 111              offsetof(struct logicalVolIntegrityDesc, impUse)) /
 112              (2 * sizeof(uint32_t)) < partnum) {
 113                 udf_err(sb, "Logical volume integrity descriptor corrupted "
 114                         "(numOfPartitions = %u)!\n", partnum);
 115                 return NULL;
 116         }
 117         /* The offset is to skip freeSpaceTable and sizeTable arrays */
 118         offset = partnum * 2 * sizeof(uint32_t);
 119         return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
 120 }
 121
 122 /* UDF filesystem type */
 123 static struct dentry *udf_mount(struct file_system_type *fs_type,
 124                       int flags, const char *dev_name, void *data)
 125 {
 126         return mount_bdev(fs_type, flags, dev_name, data, udf_fill_super);
 127 }
 128
 129 static struct file_system_type udf_fstype = {
 130         .owner          = THIS_MODULE,
 131         .name           = "udf",
 132         .mount          = udf_mount,
 133         .kill_sb        = kill_block_super,
 134         .fs_flags       = FS_REQUIRES_DEV,
 135 };
 136 MODULE_ALIAS_FS("udf");
 137
 138 static struct kmem_cache *udf_inode_cachep;
 139
 140 static struct inode *udf_alloc_inode(struct super_block *sb)
 141 {
 142         struct udf_inode_info *ei;
 143         ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
 144         if (!ei)
 145                 return NULL;
 146
 147         ei->i_unique = 0;
 148         ei->i_lenExtents = 0;
 149         ei->i_next_alloc_block = 0;
 150         ei->i_next_alloc_goal = 0;
 151         ei->i_strat4096 = 0;
 152         init_rwsem(&ei->i_data_sem);
 153         ei->cached_extent.lstart = -1;
 154         spin_lock_init(&ei->i_extent_cache_lock);
 155
 156         return &ei->vfs_inode;
 157 }
 158
 159 static void udf_i_callback(struct rcu_head *head)
 160 {
 161         struct inode *inode = container_of(head, struct inode, i_rcu);
 162         kmem_cache_free(udf_inode_cachep, UDF_I(inode));
 163 }
 164
 165 static void udf_destroy_inode(struct inode *inode)
 166 {
 167         call_rcu(&inode->i_rcu, udf_i_callback);
 168 }
 169
 170 static void init_once(void *foo)
 171 {
 172         struct udf_inode_info *ei = (struct udf_inode_info *)foo;
 173
 174         ei->i_ext.i_data = NULL;
 175         inode_init_once(&ei->vfs_inode);
 176 }
 177
 178 static int init_inodecache(void)
 179 {
 180         udf_inode_cachep = kmem_cache_create("udf_inode_cache",
 181                                              sizeof(struct udf_inode_info),
 182                                              0, (SLAB_RECLAIM_ACCOUNT |
 183                                                  SLAB_MEM_SPREAD),
 184                                              init_once);
 185         if (!udf_inode_cachep)
 186                 return -ENOMEM;
 187         return 0;
 188 }
 189
 190 static void destroy_inodecache(void)
 191 {
 192         /*
 193          * Make sure all delayed rcu free inodes are flushed before we
 194          * destroy cache.
 195          */
 196         rcu_barrier();
 197         kmem_cache_destroy(udf_inode_cachep);
 198 }
 199
 200 /* Superblock operations */
 201 static const struct super_operations udf_sb_ops = {
 202         .alloc_inode    = udf_alloc_inode,
 203         .destroy_inode  = udf_destroy_inode,
 204         .write_inode    = udf_write_inode,
 205         .evict_inode    = udf_evict_inode,
 206         .put_super      = udf_put_super,
 207         .sync_fs        = udf_sync_fs,
 208         .statfs         = udf_statfs,
 209         .remount_fs     = udf_remount_fs,
 210         .show_options   = udf_show_options,
 211 };
 212
 213 struct udf_options {
 214         unsigned char novrs;
 215         unsigned int blocksize;
 216         unsigned int session;
 217         unsigned int lastblock;
 218         unsigned int anchor;
 219         unsigned int volume;
 220         unsigned short partition;
 221         unsigned int fileset;
 222         unsigned int rootdir;
 223         unsigned int flags;
 224         umode_t umask;
 225         kgid_t gid;
 226         kuid_t uid;
 227         umode_t fmode;
 228         umode_t dmode;
 229         struct nls_table *nls_map;
 230 };
 231
 232 static int __init init_udf_fs(void)
 233 {
 234         int err;
 235
 236         err = init_inodecache();
 237         if (err)
 238                 goto out1;
 239         err = register_filesystem(&udf_fstype);
 240         if (err)
 241                 goto out;
 242
 243         return 0;
 244
 245 out:
 246         destroy_inodecache();
 247
 248 out1:
 249         return err;
 250 }
 251
 252 static void __exit exit_udf_fs(void)
 253 {
 254         unregister_filesystem(&udf_fstype);
 255         destroy_inodecache();
 256 }
 257
 258 module_init(init_udf_fs)
 259 module_exit(exit_udf_fs)
 260
 261 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
 262 {
 263         struct udf_sb_info *sbi = UDF_SB(sb);
 264
 265         sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map),
 266                                   GFP_KERNEL);
 267         if (!sbi->s_partmaps) {
 268                 udf_err(sb, "Unable to allocate space for %d partition maps\n",
 269                         count);
 270                 sbi->s_partitions = 0;
 271                 return -ENOMEM;
 272         }
 273
 274         sbi->s_partitions = count;
 275         return 0;
 276 }
 277
 278 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
 279 {
 280         int i;
 281         int nr_groups = bitmap->s_nr_groups;
 282         int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
 283                                                 nr_groups);
 284
 285         for (i = 0; i < nr_groups; i++)
 286                 if (bitmap->s_block_bitmap[i])
 287                         brelse(bitmap->s_block_bitmap[i]);
 288
 289         if (size <= PAGE_SIZE)
 290                 kfree(bitmap);
 291         else
 292                 vfree(bitmap);
 293 }
 294
 295 static void udf_free_partition(struct udf_part_map *map)
 296 {
 297         int i;
 298         struct udf_meta_data *mdata;
 299
 300         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
 301                 iput(map->s_uspace.s_table);
 302         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
 303                 iput(map->s_fspace.s_table);
 304         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
 305                 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
 306         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
 307                 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
 308         if (map->s_partition_type == UDF_SPARABLE_MAP15)
 309                 for (i = 0; i < 4; i++)
 310                         brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
 311         else if (map->s_partition_type == UDF_METADATA_MAP25) {
 312                 mdata = &map->s_type_specific.s_metadata;
 313                 iput(mdata->s_metadata_fe);
 314                 mdata->s_metadata_fe = NULL;
 315
 316                 iput(mdata->s_mirror_fe);
 317                 mdata->s_mirror_fe = NULL;
 318
 319                 iput(mdata->s_bitmap_fe);
 320                 mdata->s_bitmap_fe = NULL;
 321         }
 322 }
 323
 324 static void udf_sb_free_partitions(struct super_block *sb)
 325 {
 326         struct udf_sb_info *sbi = UDF_SB(sb);
 327         int i;
 328         if (sbi->s_partmaps == NULL)
 329                 return;
 330         for (i = 0; i < sbi->s_partitions; i++)
 331                 udf_free_partition(&sbi->s_partmaps[i]);
 332         kfree(sbi->s_partmaps);
 333         sbi->s_partmaps = NULL;
 334 }
 335
 336 static int udf_show_options(struct seq_file *seq, struct dentry *root)
 337 {
 338         struct super_block *sb = root->d_sb;
 339         struct udf_sb_info *sbi = UDF_SB(sb);
 340
 341         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
 342                 seq_puts(seq, ",nostrict");
 343         if (UDF_QUERY_FLAG(sb, UDF_FLAG_BLOCKSIZE_SET))
 344                 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
 345         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
 346                 seq_puts(seq, ",unhide");
 347         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
 348                 seq_puts(seq, ",undelete");
 349         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
 350                 seq_puts(seq, ",noadinicb");
 351         if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
 352                 seq_puts(seq, ",shortad");
 353         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
 354                 seq_puts(seq, ",uid=forget");
 355         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_IGNORE))
 356                 seq_puts(seq, ",uid=ignore");
 357         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
 358                 seq_puts(seq, ",gid=forget");
 359         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE))
 360                 seq_puts(seq, ",gid=ignore");
 361         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
 362                 seq_printf(seq, ",uid=%u", from_kuid(&init_user_ns, sbi->s_uid));
 363         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
 364                 seq_printf(seq, ",gid=%u", from_kgid(&init_user_ns, sbi->s_gid));
 365         if (sbi->s_umask != 0)
 366                 seq_printf(seq, ",umask=%ho", sbi->s_umask);
 367         if (sbi->s_fmode != UDF_INVALID_MODE)
 368                 seq_printf(seq, ",mode=%ho", sbi->s_fmode);
 369         if (sbi->s_dmode != UDF_INVALID_MODE)
 370                 seq_printf(seq, ",dmode=%ho", sbi->s_dmode);
 371         if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
 372                 seq_printf(seq, ",session=%u", sbi->s_session);
 373         if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
 374                 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
 375         if (sbi->s_anchor != 0)
 376                 seq_printf(seq, ",anchor=%u", sbi->s_anchor);
 377         /*
 378          * volume, partition, fileset and rootdir seem to be ignored
 379          * currently
 380          */
 381         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
 382                 seq_puts(seq, ",utf8");
 383         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
 384                 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
 385
 386         return 0;
 387 }
 388
 389 /*
 390  * udf_parse_options
 391  *
 392  * PURPOSE
 393  *      Parse mount options.
 394  *
 395  * DESCRIPTION
 396  *      The following mount options are supported:
 397  *
 398  *      gid=            Set the default group.
 399  *      umask=          Set the default umask.
 400  *      mode=           Set the default file permissions.
 401  *      dmode=          Set the default directory permissions.
 402  *      uid=            Set the default user.
 403  *      bs=             Set the block size.
 404  *      unhide          Show otherwise hidden files.
 405  *      undelete        Show deleted files in lists.
 406  *      adinicb         Embed data in the inode (default)
 407  *      noadinicb       Don't embed data in the inode
 408  *      shortad         Use short ad's
 409  *      longad          Use long ad's (default)
 410  *      nostrict        Unset strict conformance
 411  *      iocharset=      Set the NLS character set
 412  *
 413  *      The remaining are for debugging and disaster recovery:
 414  *
 415  *      novrs           Skip volume sequence recognition
 416  *
 417  *      The following expect a offset from 0.
 418  *
 419  *      session=        Set the CDROM session (default= last session)
 420  *      anchor=         Override standard anchor location. (default= 256)
 421  *      volume=         Override the VolumeDesc location. (unused)
 422  *      partition=      Override the PartitionDesc location. (unused)
 423  *      lastblock=      Set the last block of the filesystem/
 424  *
 425  *      The following expect a offset from the partition root.
 426  *
 427  *      fileset=        Override the fileset block location. (unused)
 428  *      rootdir=        Override the root directory location. (unused)
 429  *              WARNING: overriding the rootdir to a non-directory may
 430  *              yield highly unpredictable results.
 431  *
 432  * PRE-CONDITIONS
 433  *      options         Pointer to mount options string.
 434  *      uopts           Pointer to mount options variable.
 435  *
 436  * POST-CONDITIONS
 437  *      <return>        1       Mount options parsed okay.
 438  *      <return>        0       Error parsing mount options.
 439  *
 440  * HISTORY
 441  *      July 1, 1997 - Andrew E. Mileski
 442  *      Written, tested, and released.
 443  */
 444
 445 enum {
 446         Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
 447         Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
 448         Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
 449         Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
 450         Opt_rootdir, Opt_utf8, Opt_iocharset,
 451         Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore,
 452         Opt_fmode, Opt_dmode
 453 };
 454
 455 static const match_table_t tokens = {
 456         {Opt_novrs,     "novrs"},
 457         {Opt_nostrict,  "nostrict"},
 458         {Opt_bs,        "bs=%u"},
 459         {Opt_unhide,    "unhide"},
 460         {Opt_undelete,  "undelete"},
 461         {Opt_noadinicb, "noadinicb"},
 462         {Opt_adinicb,   "adinicb"},
 463         {Opt_shortad,   "shortad"},
 464         {Opt_longad,    "longad"},
 465         {Opt_uforget,   "uid=forget"},
 466         {Opt_uignore,   "uid=ignore"},
 467         {Opt_gforget,   "gid=forget"},
 468         {Opt_gignore,   "gid=ignore"},
 469         {Opt_gid,       "gid=%u"},
 470         {Opt_uid,       "uid=%u"},
 471         {Opt_umask,     "umask=%o"},
 472         {Opt_session,   "session=%u"},
 473         {Opt_lastblock, "lastblock=%u"},
 474         {Opt_anchor,    "anchor=%u"},
 475         {Opt_volume,    "volume=%u"},
 476         {Opt_partition, "partition=%u"},
 477         {Opt_fileset,   "fileset=%u"},
 478         {Opt_rootdir,   "rootdir=%u"},
 479         {Opt_utf8,      "utf8"},
 480         {Opt_iocharset, "iocharset=%s"},
 481         {Opt_fmode,     "mode=%o"},
 482         {Opt_dmode,     "dmode=%o"},
 483         {Opt_err,       NULL}
 484 };
 485
 486 static int udf_parse_options(char *options, struct udf_options *uopt,
 487                              bool remount)
 488 {
 489         char *p;
 490         int option;
 491
 492         uopt->novrs = 0;
 493         uopt->partition = 0xFFFF;
 494         uopt->session = 0xFFFFFFFF;
 495         uopt->lastblock = 0;
 496         uopt->anchor = 0;
 497         uopt->volume = 0xFFFFFFFF;
 498         uopt->rootdir = 0xFFFFFFFF;
 499         uopt->fileset = 0xFFFFFFFF;
 500         uopt->nls_map = NULL;
 501
 502         if (!options)
 503                 return 1;
 504
 505         while ((p = strsep(&options, ",")) != NULL) {
 506                 substring_t args[MAX_OPT_ARGS];
 507                 int token;
 508                 if (!*p)
 509                         continue;
 510
 511                 token = match_token(p, tokens, args);
 512                 switch (token) {
 513                 case Opt_novrs:
 514                         uopt->novrs = 1;
 515                         break;
 516                 case Opt_bs:
 517                         if (match_int(&args[0], &option))
 518                                 return 0;
 519                         uopt->blocksize = option;
 520                         uopt->flags |= (1 << UDF_FLAG_BLOCKSIZE_SET);
 521                         break;
 522                 case Opt_unhide:
 523                         uopt->flags |= (1 << UDF_FLAG_UNHIDE);
 524                         break;
 525                 case Opt_undelete:
 526                         uopt->flags |= (1 << UDF_FLAG_UNDELETE);
 527                         break;
 528                 case Opt_noadinicb:
 529                         uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
 530                         break;
 531                 case Opt_adinicb:
 532                         uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
 533                         break;
 534                 case Opt_shortad:
 535                         uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
 536                         break;
 537                 case Opt_longad:
 538                         uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
 539                         break;
 540                 case Opt_gid:
 541                         if (match_int(args, &option))
 542                                 return 0;
 543                         uopt->gid = make_kgid(current_user_ns(), option);
 544                         if (!gid_valid(uopt->gid))
 545                                 return 0;
 546                         uopt->flags |= (1 << UDF_FLAG_GID_SET);
 547                         break;
 548                 case Opt_uid:
 549                         if (match_int(args, &option))
 550                                 return 0;
 551                         uopt->uid = make_kuid(current_user_ns(), option);
 552                         if (!uid_valid(uopt->uid))
 553                                 return 0;
 554                         uopt->flags |= (1 << UDF_FLAG_UID_SET);
 555                         break;
 556                 case Opt_umask:
 557                         if (match_octal(args, &option))
 558                                 return 0;
 559                         uopt->umask = option;
 560                         break;
 561                 case Opt_nostrict:
 562                         uopt->flags &= ~(1 << UDF_FLAG_STRICT);
 563                         break;
 564                 case Opt_session:
 565                         if (match_int(args, &option))
 566                                 return 0;
 567                         uopt->session = option;
 568                         if (!remount)
 569                                 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
 570                         break;
 571                 case Opt_lastblock:
 572                         if (match_int(args, &option))
 573                                 return 0;
 574                         uopt->lastblock = option;
 575                         if (!remount)
 576                                 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
 577                         break;
 578                 case Opt_anchor:
 579                         if (match_int(args, &option))
 580                                 return 0;
 581                         uopt->anchor = option;
 582                         break;
 583                 case Opt_volume:
 584                         if (match_int(args, &option))
 585                                 return 0;
 586                         uopt->volume = option;
 587                         break;
 588                 case Opt_partition:
 589                         if (match_int(args, &option))
 590                                 return 0;
 591                         uopt->partition = option;
 592                         break;
 593                 case Opt_fileset:
 594                         if (match_int(args, &option))
 595                                 return 0;
 596                         uopt->fileset = option;
 597                         break;
 598                 case Opt_rootdir:
 599                         if (match_int(args, &option))
 600                                 return 0;
 601                         uopt->rootdir = option;
 602                         break;
 603                 case Opt_utf8:
 604                         uopt->flags |= (1 << UDF_FLAG_UTF8);
 605                         break;
 606 #ifdef CONFIG_UDF_NLS
 607                 case Opt_iocharset:
 608                         uopt->nls_map = load_nls(args[0].from);
 609                         uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
 610                         break;
 611 #endif
 612                 case Opt_uignore:
 613                         uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
 614                         break;
 615                 case Opt_uforget:
 616                         uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
 617                         break;
 618                 case Opt_gignore:
 619                         uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
 620                         break;
 621                 case Opt_gforget:
 622                         uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
 623                         break;
 624                 case Opt_fmode:
 625                         if (match_octal(args, &option))
 626                                 return 0;
 627                         uopt->fmode = option & 0777;
 628                         break;
 629                 case Opt_dmode:
 630                         if (match_octal(args, &option))
 631                                 return 0;
 632                         uopt->dmode = option & 0777;
 633                         break;
 634                 default:
 635                         pr_err("bad mount option \"%s\" or missing value\n", p);
 636                         return 0;
 637                 }
 638         }
 639         return 1;
 640 }
 641
 642 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
 643 {
 644         struct udf_options uopt;
 645         struct udf_sb_info *sbi = UDF_SB(sb);
 646         int error = 0;
 647         struct logicalVolIntegrityDescImpUse *lvidiu = udf_sb_lvidiu(sb);
 648
 649         sync_filesystem(sb);
 650         if (lvidiu) {
 651                 int write_rev = le16_to_cpu(lvidiu->minUDFWriteRev);
 652                 if (write_rev > UDF_MAX_WRITE_VERSION && !(*flags & MS_RDONLY))
 653                         return -EACCES;
 654         }
 655
 656         uopt.flags = sbi->s_flags;
 657         uopt.uid   = sbi->s_uid;
 658         uopt.gid   = sbi->s_gid;
 659         uopt.umask = sbi->s_umask;
 660         uopt.fmode = sbi->s_fmode;
 661         uopt.dmode = sbi->s_dmode;
 662
 663         if (!udf_parse_options(options, &uopt, true))
 664                 return -EINVAL;
 665
 666         write_lock(&sbi->s_cred_lock);
 667         sbi->s_flags = uopt.flags;
 668         sbi->s_uid   = uopt.uid;
 669         sbi->s_gid   = uopt.gid;
 670         sbi->s_umask = uopt.umask;
 671         sbi->s_fmode = uopt.fmode;
 672         sbi->s_dmode = uopt.dmode;
 673         write_unlock(&sbi->s_cred_lock);
 674
 675         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 676                 goto out_unlock;
 677
 678         if (*flags & MS_RDONLY)
 679                 udf_close_lvid(sb);
 680         else
 681                 udf_open_lvid(sb);
 682
 683 out_unlock:
 684         return error;
 685 }
 686
 687 /* Check Volume Structure Descriptors (ECMA 167 2/9.1) */
 688 /* We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
 689 static loff_t udf_check_vsd(struct super_block *sb)
 690 {
 691         struct volStructDesc *vsd = NULL;
 692         loff_t sector = VSD_FIRST_SECTOR_OFFSET;
 693         int sectorsize;
 694         struct buffer_head *bh = NULL;
 695         int nsr02 = 0;
 696         int nsr03 = 0;
 697         struct udf_sb_info *sbi;
 698
 699         sbi = UDF_SB(sb);
 700         if (sb->s_blocksize < sizeof(struct volStructDesc))
 701                 sectorsize = sizeof(struct volStructDesc);
 702         else
 703                 sectorsize = sb->s_blocksize;
 704
 705         sector += (sbi->s_session << sb->s_blocksize_bits);
 706
 707         udf_debug("Starting at sector %u (%ld byte sectors)\n",
 708                   (unsigned int)(sector >> sb->s_blocksize_bits),
 709                   sb->s_blocksize);
 710         /* Process the sequence (if applicable). The hard limit on the sector
 711          * offset is arbitrary, hopefully large enough so that all valid UDF
 712          * filesystems will be recognised. There is no mention of an upper
 713          * bound to the size of the volume recognition area in the standard.
 714          *  The limit will prevent the code to read all the sectors of a
 715          * specially crafted image (like a bluray disc full of CD001 sectors),
 716          * potentially causing minutes or even hours of uninterruptible I/O
 717          * activity. This actually happened with uninitialised SSD partitions
 718          * (all 0xFF) before the check for the limit and all valid IDs were
 719          * added */
 720         for (; !nsr02 && !nsr03 && sector < VSD_MAX_SECTOR_OFFSET;
 721              sector += sectorsize) {
 722                 /* Read a block */
 723                 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
 724                 if (!bh)
 725                         break;
 726
 727                 /* Look for ISO  descriptors */
 728                 vsd = (struct volStructDesc *)(bh->b_data +
 729                                               (sector & (sb->s_blocksize - 1)));
 730
 731                 if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
 732                                     VSD_STD_ID_LEN)) {
 733                         switch (vsd->structType) {
 734                         case 0:
 735                                 udf_debug("ISO9660 Boot Record found\n");
 736                                 break;
 737                         case 1:
 738                                 udf_debug("ISO9660 Primary Volume Descriptor found\n");
 739                                 break;
 740                         case 2:
 741                                 udf_debug("ISO9660 Supplementary Volume Descriptor found\n");
 742                                 break;
 743                         case 3:
 744                                 udf_debug("ISO9660 Volume Partition Descriptor found\n");
 745                                 break;
 746                         case 255:
 747                                 udf_debug("ISO9660 Volume Descriptor Set Terminator found\n");
 748                                 break;
 749                         default:
 750                                 udf_debug("ISO9660 VRS (%u) found\n",
 751                                           vsd->structType);
 752                                 break;
 753                         }
 754                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
 755                                     VSD_STD_ID_LEN))
 756                         ; /* nothing */
 757                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
 758                                     VSD_STD_ID_LEN)) {
 759                         brelse(bh);
 760                         break;
 761                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
 762                                     VSD_STD_ID_LEN))
 763                         nsr02 = sector;
 764                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
 765                                     VSD_STD_ID_LEN))
 766                         nsr03 = sector;
 767                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BOOT2,
 768                                     VSD_STD_ID_LEN))
 769                         ; /* nothing */
 770                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CDW02,
 771                                     VSD_STD_ID_LEN))
 772                         ; /* nothing */
 773                 else {
 774                         /* invalid id : end of volume recognition area */
 775                         brelse(bh);
 776                         break;
 777                 }
 778                 brelse(bh);
 779         }
 780
 781         if (nsr03)
 782                 return nsr03;
 783         else if (nsr02)
 784                 return nsr02;
 785         else if (!bh && sector - (sbi->s_session << sb->s_blocksize_bits) ==
 786                         VSD_FIRST_SECTOR_OFFSET)
 787                 return -1;
 788         else
 789                 return 0;
 790 }
 791
 792 static int udf_find_fileset(struct super_block *sb,
 793                             struct kernel_lb_addr *fileset,
 794                             struct kernel_lb_addr *root)
 795 {
 796         struct buffer_head *bh = NULL;
 797         long lastblock;
 798         uint16_t ident;
 799         struct udf_sb_info *sbi;
 800
 801         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
 802             fileset->partitionReferenceNum != 0xFFFF) {
 803                 bh = udf_read_ptagged(sb, fileset, 0, &ident);
 804
 805                 if (!bh) {
 806                         return 1;
 807                 } else if (ident != TAG_IDENT_FSD) {
 808                         brelse(bh);
 809                         return 1;
 810                 }
 811
 812         }
 813
 814         sbi = UDF_SB(sb);
 815         if (!bh) {
 816                 /* Search backwards through the partitions */
 817                 struct kernel_lb_addr newfileset;
 818
 819 /* --> cvg: FIXME - is it reasonable? */
 820                 return 1;
 821
 822                 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
 823                      (newfileset.partitionReferenceNum != 0xFFFF &&
 824                       fileset->logicalBlockNum == 0xFFFFFFFF &&
 825                       fileset->partitionReferenceNum == 0xFFFF);
 826                      newfileset.partitionReferenceNum--) {
 827                         lastblock = sbi->s_partmaps
 828                                         [newfileset.partitionReferenceNum]
 829                                                 .s_partition_len;
 830                         newfileset.logicalBlockNum = 0;
 831
 832                         do {
 833                                 bh = udf_read_ptagged(sb, &newfileset, 0,
 834                                                       &ident);
 835                                 if (!bh) {
 836                                         newfileset.logicalBlockNum++;
 837                                         continue;
 838                                 }
 839
 840                                 switch (ident) {
 841                                 case TAG_IDENT_SBD:
 842                                 {
 843                                         struct spaceBitmapDesc *sp;
 844                                         sp = (struct spaceBitmapDesc *)
 845                                                                 bh->b_data;
 846                                         newfileset.logicalBlockNum += 1 +
 847                                                 ((le32_to_cpu(sp->numOfBytes) +
 848                                                   sizeof(struct spaceBitmapDesc)
 849                                                   - 1) >> sb->s_blocksize_bits);
 850                                         brelse(bh);
 851                                         break;
 852                                 }
 853                                 case TAG_IDENT_FSD:
 854                                         *fileset = newfileset;
 855                                         break;
 856                                 default:
 857                                         newfileset.logicalBlockNum++;
 858                                         brelse(bh);
 859                                         bh = NULL;
 860                                         break;
 861                                 }
 862                         } while (newfileset.logicalBlockNum < lastblock &&
 863                                  fileset->logicalBlockNum == 0xFFFFFFFF &&
 864                                  fileset->partitionReferenceNum == 0xFFFF);
 865                 }
 866         }
 867
 868         if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
 869              fileset->partitionReferenceNum != 0xFFFF) && bh) {
 870                 udf_debug("Fileset at block=%d, partition=%d\n",
 871                           fileset->logicalBlockNum,
 872                           fileset->partitionReferenceNum);
 873
 874                 sbi->s_partition = fileset->partitionReferenceNum;
 875                 udf_load_fileset(sb, bh, root);
 876                 brelse(bh);
 877                 return 0;
 878         }
 879         return 1;
 880 }
 881
 882 /*
 883  * Load primary Volume Descriptor Sequence
 884  *
 885  * Return <0 on error, 0 on success. -EAGAIN is special meaning next sequence
 886  * should be tried.
 887  */
 888 static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
 889 {
 890         struct primaryVolDesc *pvoldesc;
 891         struct ustr *instr, *outstr;
 892         struct buffer_head *bh;
 893         uint16_t ident;
 894         int ret = -ENOMEM;
 895
 896         instr = kmalloc(sizeof(struct ustr), GFP_NOFS);
 897         if (!instr)
 898                 return -ENOMEM;
 899
 900         outstr = kmalloc(sizeof(struct ustr), GFP_NOFS);
 901         if (!outstr)
 902                 goto out1;
 903
 904         bh = udf_read_tagged(sb, block, block, &ident);
 905         if (!bh) {
 906                 ret = -EAGAIN;
 907                 goto out2;
 908         }
 909
 910         if (ident != TAG_IDENT_PVD) {
 911                 ret = -EIO;
 912                 goto out_bh;
 913         }
 914
 915         pvoldesc = (struct primaryVolDesc *)bh->b_data;
 916
 917         if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
 918                               pvoldesc->recordingDateAndTime)) {
 919 #ifdef UDFFS_DEBUG
 920                 struct timestamp *ts = &pvoldesc->recordingDateAndTime;
 921                 udf_debug("recording time %04u/%02u/%02u %02u:%02u (%x)\n",
 922                           le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
 923                           ts->minute, le16_to_cpu(ts->typeAndTimezone));
 924 #endif
 925         }
 926
 927         if (!udf_build_ustr(instr, pvoldesc->volIdent, 32))
 928                 if (udf_CS0toUTF8(outstr, instr)) {
 929                         strncpy(UDF_SB(sb)->s_volume_ident, outstr->u_name,
 930                                 outstr->u_len > 31 ? 31 : outstr->u_len);
 931                         udf_debug("volIdent[] = '%s'\n",
 932                                   UDF_SB(sb)->s_volume_ident);
 933                 }
 934
 935         if (!udf_build_ustr(instr, pvoldesc->volSetIdent, 128))
 936                 if (udf_CS0toUTF8(outstr, instr))
 937                         udf_debug("volSetIdent[] = '%s'\n", outstr->u_name);
 938
 939         ret = 0;
 940 out_bh:
 941         brelse(bh);
 942 out2:
 943         kfree(outstr);
 944 out1:
 945         kfree(instr);
 946         return ret;
 947 }
 948
 949 struct inode *udf_find_metadata_inode_efe(struct super_block *sb,
 950                                         u32 meta_file_loc, u32 partition_num)
 951 {
 952         struct kernel_lb_addr addr;
 953         struct inode *metadata_fe;
 954
 955         addr.logicalBlockNum = meta_file_loc;
 956         addr.partitionReferenceNum = partition_num;
 957
 958         metadata_fe = udf_iget(sb, &addr);
 959
 960         if (metadata_fe == NULL)
 961                 udf_warn(sb, "metadata inode efe not found\n");
 962         else if (UDF_I(metadata_fe)->i_alloc_type != ICBTAG_FLAG_AD_SHORT) {
 963                 udf_warn(sb, "metadata inode efe does not have short allocation descriptors!\n");
 964                 iput(metadata_fe);
 965                 metadata_fe = NULL;
 966         }
 967
 968         return metadata_fe;
 969 }
 970
 971 static int udf_load_metadata_files(struct super_block *sb, int partition)
 972 {
 973         struct udf_sb_info *sbi = UDF_SB(sb);
 974         struct udf_part_map *map;
 975         struct udf_meta_data *mdata;
 976         struct kernel_lb_addr addr;
 977
 978         map = &sbi->s_partmaps[partition];
 979         mdata = &map->s_type_specific.s_metadata;
 980
 981         /* metadata address */
 982         udf_debug("Metadata file location: block = %d part = %d\n",
 983                   mdata->s_meta_file_loc, map->s_partition_num);
 984
 985         mdata->s_metadata_fe = udf_find_metadata_inode_efe(sb,
 986                 mdata->s_meta_file_loc, map->s_partition_num);
 987
 988         if (mdata->s_metadata_fe == NULL) {
 989                 /* mirror file entry */
 990                 udf_debug("Mirror metadata file location: block = %d part = %d\n",
 991                           mdata->s_mirror_file_loc, map->s_partition_num);
 992
 993                 mdata->s_mirror_fe = udf_find_metadata_inode_efe(sb,
 994                         mdata->s_mirror_file_loc, map->s_partition_num);
 995
 996                 if (mdata->s_mirror_fe == NULL) {
 997                         udf_err(sb, "Both metadata and mirror metadata inode efe can not found\n");
 998                         return -EIO;
 999                 }
1000         }
1001
1002         /*
1003          * bitmap file entry
1004          * Note:
1005          * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
1006         */
1007         if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
1008                 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
1009                 addr.partitionReferenceNum = map->s_partition_num;
1010
1011                 udf_debug("Bitmap file location: block = %d part = %d\n",
1012                           addr.logicalBlockNum, addr.partitionReferenceNum);
1013
1014                 mdata->s_bitmap_fe = udf_iget(sb, &addr);
1015                 if (mdata->s_bitmap_fe == NULL) {
1016                         if (sb->s_flags & MS_RDONLY)
1017                                 udf_warn(sb, "bitmap inode efe not found but it's ok since the disc is mounted read-only\n");
1018                         else {
1019                                 udf_err(sb, "bitmap inode efe not found and attempted read-write mount\n");
1020                                 return -EIO;
1021                         }
1022                 }
1023         }
1024
1025         udf_debug("udf_load_metadata_files Ok\n");
1026         return 0;
1027 }
1028
1029 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
1030                              struct kernel_lb_addr *root)
1031 {
1032         struct fileSetDesc *fset;
1033
1034         fset = (struct fileSetDesc *)bh->b_data;
1035
1036         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
1037
1038         UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
1039
1040         udf_debug("Rootdir at block=%d, partition=%d\n",
1041                   root->logicalBlockNum, root->partitionReferenceNum);
1042 }
1043
1044 int udf_compute_nr_groups(struct super_block *sb, u32 partition)
1045 {
1046         struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
1047         return DIV_ROUND_UP(map->s_partition_len +
1048                             (sizeof(struct spaceBitmapDesc) << 3),
1049                             sb->s_blocksize * 8);
1050 }
1051
1052 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
1053 {
1054         struct udf_bitmap *bitmap;
1055         int nr_groups;
1056         int size;
1057
1058         nr_groups = udf_compute_nr_groups(sb, index);
1059         size = sizeof(struct udf_bitmap) +
1060                 (sizeof(struct buffer_head *) * nr_groups);
1061
1062         if (size <= PAGE_SIZE)
1063                 bitmap = kzalloc(size, GFP_KERNEL);
1064         else
1065                 bitmap = vzalloc(size); /* TODO: get rid of vzalloc */
1066
1067         if (bitmap == NULL)
1068                 return NULL;
1069
1070         bitmap->s_nr_groups = nr_groups;
1071         return bitmap;
1072 }
1073
1074 static int udf_fill_partdesc_info(struct super_block *sb,
1075                 struct partitionDesc *p, int p_index)
1076 {
1077         struct udf_part_map *map;
1078         struct udf_sb_info *sbi = UDF_SB(sb);
1079         struct partitionHeaderDesc *phd;
1080
1081         map = &sbi->s_partmaps[p_index];
1082
1083         map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
1084         map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
1085
1086         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
1087                 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
1088         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
1089                 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
1090         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
1091                 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
1092         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
1093                 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
1094
1095         udf_debug("Partition (%d type %x) starts at physical %d, block length %d\n",
1096                   p_index, map->s_partition_type,
1097                   map->s_partition_root, map->s_partition_len);
1098
1099         if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1100             strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
1101                 return 0;
1102
1103         phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1104         if (phd->unallocSpaceTable.extLength) {
1105                 struct kernel_lb_addr loc = {
1106                         .logicalBlockNum = le32_to_cpu(
1107                                 phd->unallocSpaceTable.extPosition),
1108                         .partitionReferenceNum = p_index,
1109                 };
1110
1111                 map->s_uspace.s_table = udf_iget(sb, &loc);
1112                 if (!map->s_uspace.s_table) {
1113                         udf_debug("cannot load unallocSpaceTable (part %d)\n",
1114                                   p_index);
1115                         return -EIO;
1116                 }
1117                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1118                 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
1119                           p_index, map->s_uspace.s_table->i_ino);
1120         }
1121
1122         if (phd->unallocSpaceBitmap.extLength) {
1123                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1124                 if (!bitmap)
1125                         return -ENOMEM;
1126                 map->s_uspace.s_bitmap = bitmap;
1127                 bitmap->s_extPosition = le32_to_cpu(
1128                                 phd->unallocSpaceBitmap.extPosition);
1129                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1130                 udf_debug("unallocSpaceBitmap (part %d) @ %d\n",
1131                           p_index, bitmap->s_extPosition);
1132         }
1133
1134         if (phd->partitionIntegrityTable.extLength)
1135                 udf_debug("partitionIntegrityTable (part %d)\n", p_index);
1136
1137         if (phd->freedSpaceTable.extLength) {
1138                 struct kernel_lb_addr loc = {
1139                         .logicalBlockNum = le32_to_cpu(
1140                                 phd->freedSpaceTable.extPosition),
1141                         .partitionReferenceNum = p_index,
1142                 };
1143
1144                 map->s_fspace.s_table = udf_iget(sb, &loc);
1145                 if (!map->s_fspace.s_table) {
1146                         udf_debug("cannot load freedSpaceTable (part %d)\n",
1147                                   p_index);
1148                         return -EIO;
1149                 }
1150
1151                 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
1152                 udf_debug("freedSpaceTable (part %d) @ %ld\n",
1153                           p_index, map->s_fspace.s_table->i_ino);
1154         }
1155
1156         if (phd->freedSpaceBitmap.extLength) {
1157                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1158                 if (!bitmap)
1159                         return -ENOMEM;
1160                 map->s_fspace.s_bitmap = bitmap;
1161                 bitmap->s_extPosition = le32_to_cpu(
1162                                 phd->freedSpaceBitmap.extPosition);
1163                 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1164                 udf_debug("freedSpaceBitmap (part %d) @ %d\n",
1165                           p_index, bitmap->s_extPosition);
1166         }
1167         return 0;
1168 }
1169
1170 static void udf_find_vat_block(struct super_block *sb, int p_index,
1171                                int type1_index, sector_t start_block)
1172 {
1173         struct udf_sb_info *sbi = UDF_SB(sb);
1174         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1175         sector_t vat_block;
1176         struct kernel_lb_addr ino;
1177
1178         /*
1179          * VAT file entry is in the last recorded block. Some broken disks have
1180          * it a few blocks before so try a bit harder...
1181          */
1182         ino.partitionReferenceNum = type1_index;
1183         for (vat_block = start_block;
1184              vat_block >= map->s_partition_root &&
1185              vat_block >= start_block - 3 &&
1186              !sbi->s_vat_inode; vat_block--) {
1187                 ino.logicalBlockNum = vat_block - map->s_partition_root;
1188                 sbi->s_vat_inode = udf_iget(sb, &ino);
1189         }
1190 }
1191
1192 static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1193 {
1194         struct udf_sb_info *sbi = UDF_SB(sb);
1195         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1196         struct buffer_head *bh = NULL;
1197         struct udf_inode_info *vati;
1198         uint32_t pos;
1199         struct virtualAllocationTable20 *vat20;
1200         sector_t blocks = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
1201
1202         udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block);
1203         if (!sbi->s_vat_inode &&
1204             sbi->s_last_block != blocks - 1) {
1205                 pr_notice("Failed to read VAT inode from the last recorded block (%lu), retrying with the last block of the device (%lu).\n",
1206                           (unsigned long)sbi->s_last_block,
1207                           (unsigned long)blocks - 1);
1208                 udf_find_vat_block(sb, p_index, type1_index, blocks - 1);
1209         }
1210         if (!sbi->s_vat_inode)
1211                 return -EIO;
1212
1213         if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1214                 map->s_type_specific.s_virtual.s_start_offset = 0;
1215                 map->s_type_specific.s_virtual.s_num_entries =
1216                         (sbi->s_vat_inode->i_size - 36) >> 2;
1217         } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1218                 vati = UDF_I(sbi->s_vat_inode);
1219                 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1220                         pos = udf_block_map(sbi->s_vat_inode, 0);
1221                         bh = sb_bread(sb, pos);
1222                         if (!bh)
1223                                 return -EIO;
1224                         vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1225                 } else {
1226                         vat20 = (struct virtualAllocationTable20 *)
1227                                                         vati->i_ext.i_data;
1228                 }
1229
1230                 map->s_type_specific.s_virtual.s_start_offset =
1231                         le16_to_cpu(vat20->lengthHeader);
1232                 map->s_type_specific.s_virtual.s_num_entries =
1233                         (sbi->s_vat_inode->i_size -
1234                                 map->s_type_specific.s_virtual.
1235                                         s_start_offset) >> 2;
1236                 brelse(bh);
1237         }
1238         return 0;
1239 }
1240
1241 /*
1242  * Load partition descriptor block
1243  *
1244  * Returns <0 on error, 0 on success, -EAGAIN is special - try next descriptor
1245  * sequence.
1246  */
1247 static int udf_load_partdesc(struct super_block *sb, sector_t block)
1248 {
1249         struct buffer_head *bh;
1250         struct partitionDesc *p;
1251         struct udf_part_map *map;
1252         struct udf_sb_info *sbi = UDF_SB(sb);
1253         int i, type1_idx;
1254         uint16_t partitionNumber;
1255         uint16_t ident;
1256         int ret;
1257
1258         bh = udf_read_tagged(sb, block, block, &ident);
1259         if (!bh)
1260                 return -EAGAIN;
1261         if (ident != TAG_IDENT_PD) {
1262                 ret = 0;
1263                 goto out_bh;
1264         }
1265
1266         p = (struct partitionDesc *)bh->b_data;
1267         partitionNumber = le16_to_cpu(p->partitionNumber);
1268
1269         /* First scan for TYPE1, SPARABLE and METADATA partitions */
1270         for (i = 0; i < sbi->s_partitions; i++) {
1271                 map = &sbi->s_partmaps[i];
1272                 udf_debug("Searching map: (%d == %d)\n",
1273                           map->s_partition_num, partitionNumber);
1274                 if (map->s_partition_num == partitionNumber &&
1275                     (map->s_partition_type == UDF_TYPE1_MAP15 ||
1276                      map->s_partition_type == UDF_SPARABLE_MAP15))
1277                         break;
1278         }
1279
1280         if (i >= sbi->s_partitions) {
1281                 udf_debug("Partition (%d) not found in partition map\n",
1282                           partitionNumber);
1283                 ret = 0;
1284                 goto out_bh;
1285         }
1286
1287         ret = udf_fill_partdesc_info(sb, p, i);
1288         if (ret < 0)
1289                 goto out_bh;
1290
1291         /*
1292          * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1293          * PHYSICAL partitions are already set up
1294          */
1295         type1_idx = i;
1296 #ifdef UDFFS_DEBUG
1297         map = NULL; /* supress 'maybe used uninitialized' warning */
1298 #endif
1299         for (i = 0; i < sbi->s_partitions; i++) {
1300                 map = &sbi->s_partmaps[i];
1301
1302                 if (map->s_partition_num == partitionNumber &&
1303                     (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1304                      map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1305                      map->s_partition_type == UDF_METADATA_MAP25))
1306                         break;
1307         }
1308
1309         if (i >= sbi->s_partitions) {
1310                 ret = 0;
1311                 goto out_bh;
1312         }
1313
1314         ret = udf_fill_partdesc_info(sb, p, i);
1315         if (ret < 0)
1316                 goto out_bh;
1317
1318         if (map->s_partition_type == UDF_METADATA_MAP25) {
1319                 ret = udf_load_metadata_files(sb, i);
1320                 if (ret < 0) {
1321                         udf_err(sb, "error loading MetaData partition map %d\n",
1322                                 i);
1323                         goto out_bh;
1324                 }
1325         } else {
1326                 /*
1327                  * If we have a partition with virtual map, we don't handle
1328                  * writing to it (we overwrite blocks instead of relocating
1329                  * them).
1330                  */
1331                 if (!(sb->s_flags & MS_RDONLY)) {
1332                         ret = -EACCES;
1333                         goto out_bh;
1334                 }
1335                 ret = udf_load_vat(sb, i, type1_idx);
1336                 if (ret < 0)
1337                         goto out_bh;
1338         }
1339         ret = 0;
1340 out_bh:
1341         /* In case loading failed, we handle cleanup in udf_fill_super */
1342         brelse(bh);
1343         return ret;
1344 }
1345
1346 static int udf_load_sparable_map(struct super_block *sb,
1347                                  struct udf_part_map *map,
1348                                  struct sparablePartitionMap *spm)
1349 {
1350         uint32_t loc;
1351         uint16_t ident;
1352         struct sparingTable *st;
1353         struct udf_sparing_data *sdata = &map->s_type_specific.s_sparing;
1354         int i;
1355         struct buffer_head *bh;
1356
1357         map->s_partition_type = UDF_SPARABLE_MAP15;
1358         sdata->s_packet_len = le16_to_cpu(spm->packetLength);
1359         if (!is_power_of_2(sdata->s_packet_len)) {
1360                 udf_err(sb, "error loading logical volume descriptor: "
1361                         "Invalid packet length %u\n",
1362                         (unsigned)sdata->s_packet_len);
1363                 return -EIO;
1364         }
1365         if (spm->numSparingTables > 4) {
1366                 udf_err(sb, "error loading logical volume descriptor: "
1367                         "Too many sparing tables (%d)\n",
1368                         (int)spm->numSparingTables);
1369                 return -EIO;
1370         }
1371
1372         for (i = 0; i < spm->numSparingTables; i++) {
1373                 loc = le32_to_cpu(spm->locSparingTable[i]);
1374                 bh = udf_read_tagged(sb, loc, loc, &ident);
1375                 if (!bh)
1376                         continue;
1377
1378                 st = (struct sparingTable *)bh->b_data;
1379                 if (ident != 0 ||
1380                     strncmp(st->sparingIdent.ident, UDF_ID_SPARING,
1381                             strlen(UDF_ID_SPARING)) ||
1382                     sizeof(*st) + le16_to_cpu(st->reallocationTableLen) >
1383                                                         sb->s_blocksize) {
1384                         brelse(bh);
1385                         continue;
1386                 }
1387
1388                 sdata->s_spar_map[i] = bh;
1389         }
1390         map->s_partition_func = udf_get_pblock_spar15;
1391         return 0;
1392 }
1393
1394 static int udf_load_logicalvol(struct super_block *sb, sector_t block,
1395                                struct kernel_lb_addr *fileset)
1396 {
1397         struct logicalVolDesc *lvd;
1398         int i, offset;
1399         uint8_t type;
1400         struct udf_sb_info *sbi = UDF_SB(sb);
1401         struct genericPartitionMap *gpm;
1402         uint16_t ident;
1403         struct buffer_head *bh;
1404         unsigned int table_len;
1405         int ret;
1406
1407         bh = udf_read_tagged(sb, block, block, &ident);
1408         if (!bh)
1409                 return -EAGAIN;
1410         BUG_ON(ident != TAG_IDENT_LVD);
1411         lvd = (struct logicalVolDesc *)bh->b_data;
1412         table_len = le32_to_cpu(lvd->mapTableLength);
1413         if (table_len > sb->s_blocksize - sizeof(*lvd)) {
1414                 udf_err(sb, "error loading logical volume descriptor: "
1415                         "Partition table too long (%u > %lu)\n", table_len,
1416                         sb->s_blocksize - sizeof(*lvd));
1417                 ret = -EIO;
1418                 goto out_bh;
1419         }
1420
1421         ret = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1422         if (ret)
1423                 goto out_bh;
1424
1425         for (i = 0, offset = 0;
1426              i < sbi->s_partitions && offset < table_len;
1427              i++, offset += gpm->partitionMapLength) {
1428                 struct udf_part_map *map = &sbi->s_partmaps[i];
1429                 gpm = (struct genericPartitionMap *)
1430                                 &(lvd->partitionMaps[offset]);
1431                 type = gpm->partitionMapType;
1432                 if (type == 1) {
1433                         struct genericPartitionMap1 *gpm1 =
1434                                 (struct genericPartitionMap1 *)gpm;
1435                         map->s_partition_type = UDF_TYPE1_MAP15;
1436                         map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1437                         map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1438                         map->s_partition_func = NULL;
1439                 } else if (type == 2) {
1440                         struct udfPartitionMap2 *upm2 =
1441                                                 (struct udfPartitionMap2 *)gpm;
1442                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1443                                                 strlen(UDF_ID_VIRTUAL))) {
1444                                 u16 suf =
1445                                         le16_to_cpu(((__le16 *)upm2->partIdent.
1446                                                         identSuffix)[0]);
1447                                 if (suf < 0x0200) {
1448                                         map->s_partition_type =
1449                                                         UDF_VIRTUAL_MAP15;
1450                                         map->s_partition_func =
1451                                                         udf_get_pblock_virt15;
1452                                 } else {
1453                                         map->s_partition_type =
1454                                                         UDF_VIRTUAL_MAP20;
1455                                         map->s_partition_func =
1456                                                         udf_get_pblock_virt20;
1457                                 }
1458                         } else if (!strncmp(upm2->partIdent.ident,
1459                                                 UDF_ID_SPARABLE,
1460                                                 strlen(UDF_ID_SPARABLE))) {
1461                                 ret = udf_load_sparable_map(sb, map,
1462                                         (struct sparablePartitionMap *)gpm);
1463                                 if (ret < 0)
1464                                         goto out_bh;
1465                         } else if (!strncmp(upm2->partIdent.ident,
1466                                                 UDF_ID_METADATA,
1467                                                 strlen(UDF_ID_METADATA))) {
1468                                 struct udf_meta_data *mdata =
1469                                         &map->s_type_specific.s_metadata;
1470                                 struct metadataPartitionMap *mdm =
1471                                                 (struct metadataPartitionMap *)
1472                                                 &(lvd->partitionMaps[offset]);
1473                                 udf_debug("Parsing Logical vol part %d type %d  id=%s\n",
1474                                           i, type, UDF_ID_METADATA);
1475
1476                                 map->s_partition_type = UDF_METADATA_MAP25;
1477                                 map->s_partition_func = udf_get_pblock_meta25;
1478
1479                                 mdata->s_meta_file_loc   =
1480                                         le32_to_cpu(mdm->metadataFileLoc);
1481                                 mdata->s_mirror_file_loc =
1482                                         le32_to_cpu(mdm->metadataMirrorFileLoc);
1483                                 mdata->s_bitmap_file_loc =
1484                                         le32_to_cpu(mdm->metadataBitmapFileLoc);
1485                                 mdata->s_alloc_unit_size =
1486                                         le32_to_cpu(mdm->allocUnitSize);
1487                                 mdata->s_align_unit_size =
1488                                         le16_to_cpu(mdm->alignUnitSize);
1489                                 if (mdm->flags & 0x01)
1490                                         mdata->s_flags |= MF_DUPLICATE_MD;
1491
1492                                 udf_debug("Metadata Ident suffix=0x%x\n",
1493                                           le16_to_cpu(*(__le16 *)
1494                                                       mdm->partIdent.identSuffix));
1495                                 udf_debug("Metadata part num=%d\n",
1496                                           le16_to_cpu(mdm->partitionNum));
1497                                 udf_debug("Metadata part alloc unit size=%d\n",
1498                                           le32_to_cpu(mdm->allocUnitSize));
1499                                 udf_debug("Metadata file loc=%d\n",
1500                                           le32_to_cpu(mdm->metadataFileLoc));
1501                                 udf_debug("Mirror file loc=%d\n",
1502                                           le32_to_cpu(mdm->metadataMirrorFileLoc));
1503                                 udf_debug("Bitmap file loc=%d\n",
1504                                           le32_to_cpu(mdm->metadataBitmapFileLoc));
1505                                 udf_debug("Flags: %d %d\n",
1506                                           mdata->s_flags, mdm->flags);
1507                         } else {
1508                                 udf_debug("Unknown ident: %s\n",
1509                                           upm2->partIdent.ident);
1510                                 continue;
1511                         }
1512                         map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1513                         map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1514                 }
1515                 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1516                           i, map->s_partition_num, type, map->s_volumeseqnum);
1517         }
1518
1519         if (fileset) {
1520                 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
1521
1522                 *fileset = lelb_to_cpu(la->extLocation);
1523                 udf_debug("FileSet found in LogicalVolDesc at block=%d, partition=%d\n",
1524                           fileset->logicalBlockNum,
1525                           fileset->partitionReferenceNum);
1526         }
1527         if (lvd->integritySeqExt.extLength)
1528                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1529         ret = 0;
1530 out_bh:
1531         brelse(bh);
1532         return ret;
1533 }
1534
1535 /*
1536  * udf_load_logicalvolint
1537  *
1538  */
1539 static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
1540 {
1541         struct buffer_head *bh = NULL;
1542         uint16_t ident;
1543         struct udf_sb_info *sbi = UDF_SB(sb);
1544         struct logicalVolIntegrityDesc *lvid;
1545
1546         while (loc.extLength > 0 &&
1547                (bh = udf_read_tagged(sb, loc.extLocation,
1548                                      loc.extLocation, &ident)) &&
1549                ident == TAG_IDENT_LVID) {
1550                 sbi->s_lvid_bh = bh;
1551                 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1552
1553                 if (lvid->nextIntegrityExt.extLength)
1554                         udf_load_logicalvolint(sb,
1555                                 leea_to_cpu(lvid->nextIntegrityExt));
1556
1557                 if (sbi->s_lvid_bh != bh)
1558                         brelse(bh);
1559                 loc.extLength -= sb->s_blocksize;
1560                 loc.extLocation++;
1561         }
1562         if (sbi->s_lvid_bh != bh)
1563                 brelse(bh);
1564 }
1565
1566 /*
1567  * Process a main/reserve volume descriptor sequence.
1568  *   @block             First block of first extent of the sequence.
1569  *   @lastblock         Lastblock of first extent of the sequence.
1570  *   @fileset           There we store extent containing root fileset
1571  *
1572  * Returns <0 on error, 0 on success. -EAGAIN is special - try next descriptor
1573  * sequence
1574  */
1575 static noinline int udf_process_sequence(
1576                 struct super_block *sb,
1577                 sector_t block, sector_t lastblock,
1578                 struct kernel_lb_addr *fileset)
1579 {
1580         struct buffer_head *bh = NULL;
1581         struct udf_vds_record vds[VDS_POS_LENGTH];
1582         struct udf_vds_record *curr;
1583         struct generic_desc *gd;
1584         struct volDescPtr *vdp;
1585         int done = 0;
1586         uint32_t vdsn;
1587         uint16_t ident;
1588         long next_s = 0, next_e = 0;
1589         int ret;
1590
1591         memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1592
1593         /*
1594          * Read the main descriptor sequence and find which descriptors
1595          * are in it.
1596          */
1597         for (; (!done && block <= lastblock); block++) {
1598
1599                 bh = udf_read_tagged(sb, block, block, &ident);
1600                 if (!bh) {
1601                         udf_err(sb,
1602                                 "Block %llu of volume descriptor sequence is corrupted or we could not read it\n",
1603                                 (unsigned long long)block);
1604                         return -EAGAIN;
1605                 }
1606
1607                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1608                 gd = (struct generic_desc *)bh->b_data;
1609                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1610                 switch (ident) {
1611                 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1612                         curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1613                         if (vdsn >= curr->volDescSeqNum) {
1614                                 curr->volDescSeqNum = vdsn;
1615                                 curr->block = block;
1616                         }
1617                         break;
1618                 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1619                         curr = &vds[VDS_POS_VOL_DESC_PTR];
1620                         if (vdsn >= curr->volDescSeqNum) {
1621                                 curr->volDescSeqNum = vdsn;
1622                                 curr->block = block;
1623
1624                                 vdp = (struct volDescPtr *)bh->b_data;
1625                                 next_s = le32_to_cpu(
1626                                         vdp->nextVolDescSeqExt.extLocation);
1627                                 next_e = le32_to_cpu(
1628                                         vdp->nextVolDescSeqExt.extLength);
1629                                 next_e = next_e >> sb->s_blocksize_bits;
1630                                 next_e += next_s;
1631                         }
1632                         break;
1633                 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1634                         curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1635                         if (vdsn >= curr->volDescSeqNum) {
1636                                 curr->volDescSeqNum = vdsn;
1637                                 curr->block = block;
1638                         }
1639                         break;
1640                 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1641                         curr = &vds[VDS_POS_PARTITION_DESC];
1642                         if (!curr->block)
1643                                 curr->block = block;
1644                         break;
1645                 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1646                         curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1647                         if (vdsn >= curr->volDescSeqNum) {
1648                                 curr->volDescSeqNum = vdsn;
1649                                 curr->block = block;
1650                         }
1651                         break;
1652                 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1653                         curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1654                         if (vdsn >= curr->volDescSeqNum) {
1655                                 curr->volDescSeqNum = vdsn;
1656                                 curr->block = block;
1657                         }
1658                         break;
1659                 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1660                         vds[VDS_POS_TERMINATING_DESC].block = block;
1661                         if (next_e) {
1662                                 block = next_s;
1663                                 lastblock = next_e;
1664                                 next_s = next_e = 0;
1665                         } else
1666                                 done = 1;
1667                         break;
1668                 }
1669                 brelse(bh);
1670         }
1671         /*
1672          * Now read interesting descriptors again and process them
1673          * in a suitable order
1674          */
1675         if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1676                 udf_err(sb, "Primary Volume Descriptor not found!\n");
1677                 return -EAGAIN;
1678         }
1679         ret = udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block);
1680         if (ret < 0)
1681                 return ret;
1682
1683         if (vds[VDS_POS_LOGICAL_VOL_DESC].block) {
1684                 ret = udf_load_logicalvol(sb,
1685                                           vds[VDS_POS_LOGICAL_VOL_DESC].block,
1686                                           fileset);
1687                 if (ret < 0)
1688                         return ret;
1689         }
1690
1691         if (vds[VDS_POS_PARTITION_DESC].block) {
1692                 /*
1693                  * We rescan the whole descriptor sequence to find
1694                  * partition descriptor blocks and process them.
1695                  */
1696                 for (block = vds[VDS_POS_PARTITION_DESC].block;
1697                      block < vds[VDS_POS_TERMINATING_DESC].block;
1698                      block++) {
1699                         ret = udf_load_partdesc(sb, block);
1700                         if (ret < 0)
1701                                 return ret;
1702                 }
1703         }
1704
1705         return 0;
1706 }
1707
1708 /*
1709  * Load Volume Descriptor Sequence described by anchor in bh
1710  *
1711  * Returns <0 on error, 0 on success
1712  */
1713 static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh,
1714                              struct kernel_lb_addr *fileset)
1715 {
1716         struct anchorVolDescPtr *anchor;
1717         sector_t main_s, main_e, reserve_s, reserve_e;
1718         int ret;
1719
1720         anchor = (struct anchorVolDescPtr *)bh->b_data;
1721
1722         /* Locate the main sequence */
1723         main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1724         main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1725         main_e = main_e >> sb->s_blocksize_bits;
1726         main_e += main_s;
1727
1728         /* Locate the reserve sequence */
1729         reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1730         reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1731         reserve_e = reserve_e >> sb->s_blocksize_bits;
1732         reserve_e += reserve_s;
1733
1734         /* Process the main & reserve sequences */
1735         /* responsible for finding the PartitionDesc(s) */
1736         ret = udf_process_sequence(sb, main_s, main_e, fileset);
1737         if (ret != -EAGAIN)
1738                 return ret;
1739         udf_sb_free_partitions(sb);
1740         ret = udf_process_sequence(sb, reserve_s, reserve_e, fileset);
1741         if (ret < 0) {
1742                 udf_sb_free_partitions(sb);
1743                 /* No sequence was OK, return -EIO */
1744                 if (ret == -EAGAIN)
1745                         ret = -EIO;
1746         }
1747         return ret;
1748 }
1749
1750 /*
1751  * Check whether there is an anchor block in the given block and
1752  * load Volume Descriptor Sequence if so.
1753  *
1754  * Returns <0 on error, 0 on success, -EAGAIN is special - try next anchor
1755  * block
1756  */
1757 static int udf_check_anchor_block(struct super_block *sb, sector_t block,
1758                                   struct kernel_lb_addr *fileset)
1759 {
1760         struct buffer_head *bh;
1761         uint16_t ident;
1762         int ret;
1763
1764         if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
1765             udf_fixed_to_variable(block) >=
1766             sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits)
1767                 return -EAGAIN;
1768
1769         bh = udf_read_tagged(sb, block, block, &ident);
1770         if (!bh)
1771                 return -EAGAIN;
1772         if (ident != TAG_IDENT_AVDP) {
1773                 brelse(bh);
1774                 return -EAGAIN;
1775         }
1776         ret = udf_load_sequence(sb, bh, fileset);
1777         brelse(bh);
1778         return ret;
1779 }
1780
1781 /*
1782  * Search for an anchor volume descriptor pointer.
1783  *
1784  * Returns < 0 on error, 0 on success. -EAGAIN is special - try next set
1785  * of anchors.
1786  */
1787 static int udf_scan_anchors(struct super_block *sb, sector_t *lastblock,
1788                             struct kernel_lb_addr *fileset)
1789 {
1790         sector_t last[6];
1791         int i;
1792         struct udf_sb_info *sbi = UDF_SB(sb);
1793         int last_count = 0;
1794         int ret;
1795
1796         /* First try user provided anchor */
1797         if (sbi->s_anchor) {
1798                 ret = udf_check_anchor_block(sb, sbi->s_anchor, fileset);
1799                 if (ret != -EAGAIN)
1800                         return ret;
1801         }
1802         /*
1803          * according to spec, anchor is in either:
1804          *     block 256
1805          *     lastblock-256
1806          *     lastblock
1807          *  however, if the disc isn't closed, it could be 512.
1808          */
1809         ret = udf_check_anchor_block(sb, sbi->s_session + 256, fileset);
1810         if (ret != -EAGAIN)
1811                 return ret;
1812         /*
1813          * The trouble is which block is the last one. Drives often misreport
1814          * this so we try various possibilities.
1815          */
1816         last[last_count++] = *lastblock;
1817         if (*lastblock >= 1)
1818                 last[last_count++] = *lastblock - 1;
1819         last[last_count++] = *lastblock + 1;
1820         if (*lastblock >= 2)
1821                 last[last_count++] = *lastblock - 2;
1822         if (*lastblock >= 150)
1823                 last[last_count++] = *lastblock - 150;
1824         if (*lastblock >= 152)
1825                 last[last_count++] = *lastblock - 152;
1826
1827         for (i = 0; i < last_count; i++) {
1828                 if (last[i] >= sb->s_bdev->bd_inode->i_size >>
1829                                 sb->s_blocksize_bits)
1830                         continue;
1831                 ret = udf_check_anchor_block(sb, last[i], fileset);
1832                 if (ret != -EAGAIN) {
1833                         if (!ret)
1834                                 *lastblock = last[i];
1835                         return ret;
1836                 }
1837                 if (last[i] < 256)
1838                         continue;
1839                 ret = udf_check_anchor_block(sb, last[i] - 256, fileset);
1840                 if (ret != -EAGAIN) {
1841                         if (!ret)
1842                                 *lastblock = last[i];
1843                         return ret;
1844                 }
1845         }
1846
1847         /* Finally try block 512 in case media is open */
1848         return udf_check_anchor_block(sb, sbi->s_session + 512, fileset);
1849 }
1850
1851 /*
1852  * Find an anchor volume descriptor and load Volume Descriptor Sequence from
1853  * area specified by it. The function expects sbi->s_lastblock to be the last
1854  * block on the media.
1855  *
1856  * Return <0 on error, 0 if anchor found. -EAGAIN is special meaning anchor
1857  * was not found.
1858  */
1859 static int udf_find_anchor(struct super_block *sb,
1860                            struct kernel_lb_addr *fileset)
1861 {
1862         struct udf_sb_info *sbi = UDF_SB(sb);
1863         sector_t lastblock = sbi->s_last_block;
1864         int ret;
1865
1866         ret = udf_scan_anchors(sb, &lastblock, fileset);
1867         if (ret != -EAGAIN)
1868                 goto out;
1869
1870         /* No anchor found? Try VARCONV conversion of block numbers */
1871         UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
1872         lastblock = udf_variable_to_fixed(sbi->s_last_block);
1873         /* Firstly, we try to not convert number of the last block */
1874         ret = udf_scan_anchors(sb, &lastblock, fileset);
1875         if (ret != -EAGAIN)
1876                 goto out;
1877
1878         lastblock = sbi->s_last_block;
1879         /* Secondly, we try with converted number of the last block */
1880         ret = udf_scan_anchors(sb, &lastblock, fileset);
1881         if (ret < 0) {
1882                 /* VARCONV didn't help. Clear it. */
1883                 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
1884         }
1885 out:
1886         if (ret == 0)
1887                 sbi->s_last_block = lastblock;
1888         return ret;
1889 }
1890
1891 /*
1892  * Check Volume Structure Descriptor, find Anchor block and load Volume
1893  * Descriptor Sequence.
1894  *
1895  * Returns < 0 on error, 0 on success. -EAGAIN is special meaning anchor
1896  * block was not found.
1897  */
1898 static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
1899                         int silent, struct kernel_lb_addr *fileset)
1900 {
1901         struct udf_sb_info *sbi = UDF_SB(sb);
1902         loff_t nsr_off;
1903         int ret;
1904
1905         if (!sb_set_blocksize(sb, uopt->blocksize)) {
1906                 if (!silent)
1907                         udf_warn(sb, "Bad block size\n");
1908                 return -EINVAL;
1909         }
1910         sbi->s_last_block = uopt->lastblock;
1911         if (!uopt->novrs) {
1912                 /* Check that it is NSR02 compliant */
1913                 nsr_off = udf_check_vsd(sb);
1914                 if (!nsr_off) {
1915                         if (!silent)
1916                                 udf_warn(sb, "No VRS found\n");
1917                         return 0;
1918                 }
1919                 if (nsr_off == -1)
1920                         udf_debug("Failed to read sector at offset %d. "
1921                                   "Assuming open disc. Skipping validity "
1922                                   "check\n", VSD_FIRST_SECTOR_OFFSET);
1923                 if (!sbi->s_last_block)
1924                         sbi->s_last_block = udf_get_last_block(sb);
1925         } else {
1926                 udf_debug("Validity check skipped because of novrs option\n");
1927         }
1928
1929         /* Look for anchor block and load Volume Descriptor Sequence */
1930         sbi->s_anchor = uopt->anchor;
1931         ret = udf_find_anchor(sb, fileset);
1932         if (ret < 0) {
1933                 if (!silent && ret == -EAGAIN)
1934                         udf_warn(sb, "No anchor found\n");
1935                 return ret;
1936         }
1937         return 0;
1938 }
1939
1940 static void udf_open_lvid(struct super_block *sb)
1941 {
1942         struct udf_sb_info *sbi = UDF_SB(sb);
1943         struct buffer_head *bh = sbi->s_lvid_bh;
1944         struct logicalVolIntegrityDesc *lvid;
1945         struct logicalVolIntegrityDescImpUse *lvidiu;
1946
1947         if (!bh)
1948                 return;
1949         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1950         lvidiu = udf_sb_lvidiu(sb);
1951         if (!lvidiu)
1952                 return;
1953
1954         mutex_lock(&sbi->s_alloc_mutex);
1955         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1956         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1957         udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
1958                                 CURRENT_TIME);
1959         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN);
1960
1961         lvid->descTag.descCRC = cpu_to_le16(
1962                 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1963                         le16_to_cpu(lvid->descTag.descCRCLength)));
1964
1965         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1966         mark_buffer_dirty(bh);
1967         sbi->s_lvid_dirty = 0;
1968         mutex_unlock(&sbi->s_alloc_mutex);
1969         /* Make opening of filesystem visible on the media immediately */
1970         sync_dirty_buffer(bh);
1971 }
1972
1973 static void udf_close_lvid(struct super_block *sb)
1974 {
1975         struct udf_sb_info *sbi = UDF_SB(sb);
1976         struct buffer_head *bh = sbi->s_lvid_bh;
1977         struct logicalVolIntegrityDesc *lvid;
1978         struct logicalVolIntegrityDescImpUse *lvidiu;
1979
1980         if (!bh)
1981                 return;
1982         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1983         lvidiu = udf_sb_lvidiu(sb);
1984         if (!lvidiu)
1985                 return;
1986
1987         mutex_lock(&sbi->s_alloc_mutex);
1988         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1989         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1990         udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
1991         if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1992                 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1993         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1994                 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1995         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
1996                 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
1997         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1998
1999         lvid->descTag.descCRC = cpu_to_le16(
2000                         crc_itu_t(0, (char *)lvid + sizeof(struct tag),
2001                                 le16_to_cpu(lvid->descTag.descCRCLength)));
2002
2003         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
2004         /*
2005          * We set buffer uptodate unconditionally here to avoid spurious
2006          * warnings from mark_buffer_dirty() when previous EIO has marked
2007          * the buffer as !uptodate
2008          */
2009         set_buffer_uptodate(bh);
2010         mark_buffer_dirty(bh);
2011         sbi->s_lvid_dirty = 0;
2012         mutex_unlock(&sbi->s_alloc_mutex);
2013         /* Make closing of filesystem visible on the media immediately */
2014         sync_dirty_buffer(bh);
2015 }
2016
2017 u64 lvid_get_unique_id(struct super_block *sb)
2018 {
2019         struct buffer_head *bh;
2020         struct udf_sb_info *sbi = UDF_SB(sb);
2021         struct logicalVolIntegrityDesc *lvid;
2022         struct logicalVolHeaderDesc *lvhd;
2023         u64 uniqueID;
2024         u64 ret;
2025
2026         bh = sbi->s_lvid_bh;
2027         if (!bh)
2028                 return 0;
2029
2030         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
2031         lvhd = (struct logicalVolHeaderDesc *)lvid->logicalVolContentsUse;
2032
2033         mutex_lock(&sbi->s_alloc_mutex);
2034         ret = uniqueID = le64_to_cpu(lvhd->uniqueID);
2035         if (!(++uniqueID & 0xFFFFFFFF))
2036                 uniqueID += 16;
2037         lvhd->uniqueID = cpu_to_le64(uniqueID);
2038         mutex_unlock(&sbi->s_alloc_mutex);
2039         mark_buffer_dirty(bh);
2040
2041         return ret;
2042 }
2043
2044 static int udf_fill_super(struct super_block *sb, void *options, int silent)
2045 {
2046         int ret = -EINVAL;
2047         struct inode *inode = NULL;
2048         struct udf_options uopt;
2049         struct kernel_lb_addr rootdir, fileset;
2050         struct udf_sb_info *sbi;
2051
2052         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
2053         uopt.uid = INVALID_UID;
2054         uopt.gid = INVALID_GID;
2055         uopt.umask = 0;
2056         uopt.fmode = UDF_INVALID_MODE;
2057         uopt.dmode = UDF_INVALID_MODE;
2058
2059         sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
2060         if (!sbi)
2061                 return -ENOMEM;
2062
2063         sb->s_fs_info = sbi;
2064
2065         mutex_init(&sbi->s_alloc_mutex);
2066
2067         if (!udf_parse_options((char *)options, &uopt, false))
2068                 goto error_out;
2069
2070         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
2071             uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
2072                 udf_err(sb, "utf8 cannot be combined with iocharset\n");
2073                 goto error_out;
2074         }
2075 #ifdef CONFIG_UDF_NLS
2076         if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
2077                 uopt.nls_map = load_nls_default();
2078                 if (!uopt.nls_map)
2079                         uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
2080                 else
2081                         udf_debug("Using default NLS map\n");
2082         }
2083 #endif
2084         if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
2085                 uopt.flags |= (1 << UDF_FLAG_UTF8);
2086
2087         fileset.logicalBlockNum = 0xFFFFFFFF;
2088         fileset.partitionReferenceNum = 0xFFFF;
2089
2090         sbi->s_flags = uopt.flags;
2091         sbi->s_uid = uopt.uid;
2092         sbi->s_gid = uopt.gid;
2093         sbi->s_umask = uopt.umask;
2094         sbi->s_fmode = uopt.fmode;
2095         sbi->s_dmode = uopt.dmode;
2096         sbi->s_nls_map = uopt.nls_map;
2097         rwlock_init(&sbi->s_cred_lock);
2098
2099         if (uopt.session == 0xFFFFFFFF)
2100                 sbi->s_session = udf_get_last_session(sb);
2101         else
2102                 sbi->s_session = uopt.session;
2103
2104         udf_debug("Multi-session=%d\n", sbi->s_session);
2105
2106         /* Fill in the rest of the superblock */
2107         sb->s_op = &udf_sb_ops;
2108         sb->s_export_op = &udf_export_ops;
2109
2110         sb->s_magic = UDF_SUPER_MAGIC;
2111         sb->s_time_gran = 1000;
2112
2113         if (uopt.flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) {
2114                 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
2115         } else {
2116                 uopt.blocksize = bdev_logical_block_size(sb->s_bdev);
2117                 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
2118                 if (ret == -EAGAIN && uopt.blocksize != UDF_DEFAULT_BLOCKSIZE) {
2119                         if (!silent)
2120                                 pr_notice("Rescanning with blocksize %d\n",
2121                                           UDF_DEFAULT_BLOCKSIZE);
2122                         brelse(sbi->s_lvid_bh);
2123                         sbi->s_lvid_bh = NULL;
2124                         uopt.blocksize = UDF_DEFAULT_BLOCKSIZE;
2125                         ret = udf_load_vrs(sb, &uopt, silent, &fileset);
2126                 }
2127         }
2128         if (ret < 0) {
2129                 if (ret == -EAGAIN) {
2130                         udf_warn(sb, "No partition found (1)\n");
2131                         ret = -EINVAL;
2132                 }
2133                 goto error_out;
2134         }
2135
2136         udf_debug("Lastblock=%d\n", sbi->s_last_block);
2137
2138         if (sbi->s_lvid_bh) {
2139                 struct logicalVolIntegrityDescImpUse *lvidiu =
2140                                                         udf_sb_lvidiu(sb);
2141                 uint16_t minUDFReadRev;
2142                 uint16_t minUDFWriteRev;
2143
2144                 if (!lvidiu) {
2145                         ret = -EINVAL;
2146                         goto error_out;
2147                 }
2148                 minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
2149                 minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
2150                 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
2151                         udf_err(sb, "minUDFReadRev=%x (max is %x)\n",
2152                                 minUDFReadRev,
2153                                 UDF_MAX_READ_VERSION);
2154                         ret = -EINVAL;
2155                         goto error_out;
2156                 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION &&
2157                            !(sb->s_flags & MS_RDONLY)) {
2158                         ret = -EACCES;
2159                         goto error_out;
2160                 }
2161
2162                 sbi->s_udfrev = minUDFWriteRev;
2163
2164                 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
2165                         UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
2166                 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
2167                         UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
2168         }
2169
2170         if (!sbi->s_partitions) {
2171                 udf_warn(sb, "No partition found (2)\n");
2172                 ret = -EINVAL;
2173                 goto error_out;
2174         }
2175
2176         if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
2177                         UDF_PART_FLAG_READ_ONLY &&
2178             !(sb->s_flags & MS_RDONLY)) {
2179                 ret = -EACCES;
2180                 goto error_out;
2181         }
2182
2183         if (udf_find_fileset(sb, &fileset, &rootdir)) {
2184                 udf_warn(sb, "No fileset found\n");
2185                 ret = -EINVAL;
2186                 goto error_out;
2187         }
2188
2189         if (!silent) {
2190                 struct timestamp ts;
2191                 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
2192                 udf_info("Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
2193                          sbi->s_volume_ident,
2194                          le16_to_cpu(ts.year), ts.month, ts.day,
2195                          ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
2196         }
2197         if (!(sb->s_flags & MS_RDONLY))
2198                 udf_open_lvid(sb);
2199
2200         /* Assign the root inode */
2201         /* assign inodes by physical block number */
2202         /* perhaps it's not extensible enough, but for now ... */
2203         inode = udf_iget(sb, &rootdir);
2204         if (!inode) {
2205                 udf_err(sb, "Error in udf_iget, block=%d, partition=%d\n",
2206                        rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
2207                 ret = -EIO;
2208                 goto error_out;
2209         }
2210
2211         /* Allocate a dentry for the root inode */
2212         sb->s_root = d_make_root(inode);
2213         if (!sb->s_root) {
2214                 udf_err(sb, "Couldn't allocate root dentry\n");
2215                 ret = -ENOMEM;
2216                 goto error_out;
2217         }
2218         sb->s_maxbytes = MAX_LFS_FILESIZE;
2219         sb->s_max_links = UDF_MAX_LINKS;
2220         return 0;
2221
2222 error_out:
2223         if (sbi->s_vat_inode)
2224                 iput(sbi->s_vat_inode);
2225 #ifdef CONFIG_UDF_NLS
2226         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2227                 unload_nls(sbi->s_nls_map);
2228 #endif
2229         if (!(sb->s_flags & MS_RDONLY))
2230                 udf_close_lvid(sb);
2231         brelse(sbi->s_lvid_bh);
2232         udf_sb_free_partitions(sb);
2233         kfree(sbi);
2234         sb->s_fs_info = NULL;
2235
2236         return ret;
2237 }
2238
2239 void _udf_err(struct super_block *sb, const char *function,
2240               const char *fmt, ...)
2241 {
2242         struct va_format vaf;
2243         va_list args;
2244
2245         va_start(args, fmt);
2246
2247         vaf.fmt = fmt;
2248         vaf.va = &args;
2249
2250         pr_err("error (device %s): %s: %pV", sb->s_id, function, &vaf);
2251
2252         va_end(args);
2253 }
2254
2255 void _udf_warn(struct super_block *sb, const char *function,
2256                const char *fmt, ...)
2257 {
2258         struct va_format vaf;
2259         va_list args;
2260
2261         va_start(args, fmt);
2262
2263         vaf.fmt = fmt;
2264         vaf.va = &args;
2265
2266         pr_warn("warning (device %s): %s: %pV", sb->s_id, function, &vaf);
2267
2268         va_end(args);
2269 }
2270
2271 static void udf_put_super(struct super_block *sb)
2272 {
2273         struct udf_sb_info *sbi;
2274
2275         sbi = UDF_SB(sb);
2276
2277         if (sbi->s_vat_inode)
2278                 iput(sbi->s_vat_inode);
2279 #ifdef CONFIG_UDF_NLS
2280         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2281                 unload_nls(sbi->s_nls_map);
2282 #endif
2283         if (!(sb->s_flags & MS_RDONLY))
2284                 udf_close_lvid(sb);
2285         brelse(sbi->s_lvid_bh);
2286         udf_sb_free_partitions(sb);
2287         kfree(sb->s_fs_info);
2288         sb->s_fs_info = NULL;
2289 }
2290
2291 static int udf_sync_fs(struct super_block *sb, int wait)
2292 {
2293         struct udf_sb_info *sbi = UDF_SB(sb);
2294
2295         mutex_lock(&sbi->s_alloc_mutex);
2296         if (sbi->s_lvid_dirty) {
2297                 /*
2298                  * Blockdevice will be synced later so we don't have to submit
2299                  * the buffer for IO
2300                  */
2301                 mark_buffer_dirty(sbi->s_lvid_bh);
2302                 sbi->s_lvid_dirty = 0;
2303         }
2304         mutex_unlock(&sbi->s_alloc_mutex);
2305
2306         return 0;
2307 }
2308
2309 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
2310 {
2311         struct super_block *sb = dentry->d_sb;
2312         struct udf_sb_info *sbi = UDF_SB(sb);
2313         struct logicalVolIntegrityDescImpUse *lvidiu;
2314         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
2315
2316         lvidiu = udf_sb_lvidiu(sb);
2317         buf->f_type = UDF_SUPER_MAGIC;
2318         buf->f_bsize = sb->s_blocksize;
2319         buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
2320         buf->f_bfree = udf_count_free(sb);
2321         buf->f_bavail = buf->f_bfree;
2322         buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2323                                           le32_to_cpu(lvidiu->numDirs)) : 0)
2324                         + buf->f_bfree;
2325         buf->f_ffree = buf->f_bfree;
2326         buf->f_namelen = UDF_NAME_LEN - 2;
2327         buf->f_fsid.val[0] = (u32)id;
2328         buf->f_fsid.val[1] = (u32)(id >> 32);
2329
2330         return 0;
2331 }
2332
2333 static unsigned int udf_count_free_bitmap(struct super_block *sb,
2334                                           struct udf_bitmap *bitmap)
2335 {
2336         struct buffer_head *bh = NULL;
2337         unsigned int accum = 0;
2338         int index;
2339         int block = 0, newblock;
2340         struct kernel_lb_addr loc;
2341         uint32_t bytes;
2342         uint8_t *ptr;
2343         uint16_t ident;
2344         struct spaceBitmapDesc *bm;
2345
2346         loc.logicalBlockNum = bitmap->s_extPosition;
2347         loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
2348         bh = udf_read_ptagged(sb, &loc, 0, &ident);
2349
2350         if (!bh) {
2351                 udf_err(sb, "udf_count_free failed\n");
2352                 goto out;
2353         } else if (ident != TAG_IDENT_SBD) {
2354                 brelse(bh);
2355                 udf_err(sb, "udf_count_free failed\n");
2356                 goto out;
2357         }
2358
2359         bm = (struct spaceBitmapDesc *)bh->b_data;
2360         bytes = le32_to_cpu(bm->numOfBytes);
2361         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2362         ptr = (uint8_t *)bh->b_data;
2363
2364         while (bytes > 0) {
2365                 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2366                 accum += bitmap_weight((const unsigned long *)(ptr + index),
2367                                         cur_bytes * 8);
2368                 bytes -= cur_bytes;
2369                 if (bytes) {
2370                         brelse(bh);
2371                         newblock = udf_get_lb_pblock(sb, &loc, ++block);
2372                         bh = udf_tread(sb, newblock);
2373                         if (!bh) {
2374                                 udf_debug("read failed\n");
2375                                 goto out;
2376                         }
2377                         index = 0;
2378                         ptr = (uint8_t *)bh->b_data;
2379                 }
2380         }
2381         brelse(bh);
2382 out:
2383         return accum;
2384 }
2385
2386 static unsigned int udf_count_free_table(struct super_block *sb,
2387                                          struct inode *table)
2388 {
2389         unsigned int accum = 0;
2390         uint32_t elen;
2391         struct kernel_lb_addr eloc;
2392         int8_t etype;
2393         struct extent_position epos;
2394
2395         mutex_lock(&UDF_SB(sb)->s_alloc_mutex);
2396         epos.block = UDF_I(table)->i_location;
2397         epos.offset = sizeof(struct unallocSpaceEntry);
2398         epos.bh = NULL;
2399
2400         while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2401                 accum += (elen >> table->i_sb->s_blocksize_bits);
2402
2403         brelse(epos.bh);
2404         mutex_unlock(&UDF_SB(sb)->s_alloc_mutex);
2405
2406         return accum;
2407 }
2408
2409 static unsigned int udf_count_free(struct super_block *sb)
2410 {
2411         unsigned int accum = 0;
2412         struct udf_sb_info *sbi;
2413         struct udf_part_map *map;
2414
2415         sbi = UDF_SB(sb);
2416         if (sbi->s_lvid_bh) {
2417                 struct logicalVolIntegrityDesc *lvid =
2418                         (struct logicalVolIntegrityDesc *)
2419                         sbi->s_lvid_bh->b_data;
2420                 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
2421                         accum = le32_to_cpu(
2422                                         lvid->freeSpaceTable[sbi->s_partition]);
2423                         if (accum == 0xFFFFFFFF)
2424                                 accum = 0;
2425                 }
2426         }
2427
2428         if (accum)
2429                 return accum;
2430
2431         map = &sbi->s_partmaps[sbi->s_partition];
2432         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2433                 accum += udf_count_free_bitmap(sb,
2434                                                map->s_uspace.s_bitmap);
2435         }
2436         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
2437                 accum += udf_count_free_bitmap(sb,
2438                                                map->s_fspace.s_bitmap);
2439         }
2440         if (accum)
2441                 return accum;
2442
2443         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2444                 accum += udf_count_free_table(sb,
2445                                               map->s_uspace.s_table);
2446         }
2447         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
2448                 accum += udf_count_free_table(sb,
2449                                               map->s_fspace.s_table);
2450         }
2451
2452         return accum;
2453 }