kernel/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/vfs.h>
  52 #include <linux/vmalloc.h>
  53 #include <linux/errno.h>
  54 #include <linux/mount.h>
  55 #include <linux/seq_file.h>
  56 #include <linux/bitmap.h>
  57 #include <linux/crc-itu-t.h>
  58 #include <linux/log2.h>
  59 #include <asm/byteorder.h>
  60
  61 #include "udf_sb.h"
  62 #include "udf_i.h"
  63
  64 #include <linux/init.h>
  65 #include <linux/uaccess.h>
  66
  67 #define VDS_POS_PRIMARY_VOL_DESC        0
  68 #define VDS_POS_UNALLOC_SPACE_DESC      1
  69 #define VDS_POS_LOGICAL_VOL_DESC        2
  70 #define VDS_POS_PARTITION_DESC          3
  71 #define VDS_POS_IMP_USE_VOL_DESC        4
  72 #define VDS_POS_VOL_DESC_PTR            5
  73 #define VDS_POS_TERMINATING_DESC        6
  74 #define VDS_POS_LENGTH                  7
  75
  76 #define UDF_DEFAULT_BLOCKSIZE 2048
  77
  78 #define VSD_FIRST_SECTOR_OFFSET         32768
  79 #define VSD_MAX_SECTOR_OFFSET           0x800000
  80
  81 enum { UDF_MAX_LINKS = 0xffff };
  82
  83 /* These are the "meat" - everything else is stuffing */
  84 static int udf_fill_super(struct super_block *, void *, int);
  85 static void udf_put_super(struct super_block *);
  86 static int udf_sync_fs(struct super_block *, int);
  87 static int udf_remount_fs(struct super_block *, int *, char *);
  88 static void udf_load_logicalvolint(struct super_block *, struct kernel_extent_ad);
  89 static int udf_find_fileset(struct super_block *, struct kernel_lb_addr *,
  90                             struct kernel_lb_addr *);
  91 static void udf_load_fileset(struct super_block *, struct buffer_head *,
  92                              struct kernel_lb_addr *);
  93 static void udf_open_lvid(struct super_block *);
  94 static void udf_close_lvid(struct super_block *);
  95 static unsigned int udf_count_free(struct super_block *);
  96 static int udf_statfs(struct dentry *, struct kstatfs *);
  97 static int udf_show_options(struct seq_file *, struct dentry *);
  98
  99 struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct super_block *sb)
 100 {
 101         struct logicalVolIntegrityDesc *lvid;
 102         unsigned int partnum;
 103         unsigned int offset;
 104
 105         if (!UDF_SB(sb)->s_lvid_bh)
 106                 return NULL;
 107         lvid = (struct logicalVolIntegrityDesc *)UDF_SB(sb)->s_lvid_bh->b_data;
 108         partnum = le32_to_cpu(lvid->numOfPartitions);
 109         if ((sb->s_blocksize - sizeof(struct logicalVolIntegrityDescImpUse) -
 110              offsetof(struct logicalVolIntegrityDesc, impUse)) /
 111              (2 * sizeof(uint32_t)) < partnum) {
 112                 udf_err(sb, "Logical volume integrity descriptor corrupted "
 113                         "(numOfPartitions = %u)!\n", partnum);
 114                 return NULL;
 115         }
 116         /* The offset is to skip freeSpaceTable and sizeTable arrays */
 117         offset = partnum * 2 * sizeof(uint32_t);
 118         return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
 119 }
 120
 121 /* UDF filesystem type */
 122 static struct dentry *udf_mount(struct file_system_type *fs_type,
 123                       int flags, const char *dev_name, void *data)
 124 {
 125         return mount_bdev(fs_type, flags, dev_name, data, udf_fill_super);
 126 }
 127
 128 static struct file_system_type udf_fstype = {
 129         .owner          = THIS_MODULE,
 130         .name           = "udf",
 131         .mount          = udf_mount,
 132         .kill_sb        = kill_block_super,
 133         .fs_flags       = FS_REQUIRES_DEV,
 134 };
 135 MODULE_ALIAS_FS("udf");
 136
 137 static struct kmem_cache *udf_inode_cachep;
 138
 139 static struct inode *udf_alloc_inode(struct super_block *sb)
 140 {
 141         struct udf_inode_info *ei;
 142         ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
 143         if (!ei)
 144                 return NULL;
 145
 146         ei->i_unique = 0;
 147         ei->i_lenExtents = 0;
 148         ei->i_next_alloc_block = 0;
 149         ei->i_next_alloc_goal = 0;
 150         ei->i_strat4096 = 0;
 151         init_rwsem(&ei->i_data_sem);
 152         ei->cached_extent.lstart = -1;
 153         spin_lock_init(&ei->i_extent_cache_lock);
 154
 155         return &ei->vfs_inode;
 156 }
 157
 158 static void udf_i_callback(struct rcu_head *head)
 159 {
 160         struct inode *inode = container_of(head, struct inode, i_rcu);
 161         kmem_cache_free(udf_inode_cachep, UDF_I(inode));
 162 }
 163
 164 static void udf_destroy_inode(struct inode *inode)
 165 {
 166         call_rcu(&inode->i_rcu, udf_i_callback);
 167 }
 168
 169 static void init_once(void *foo)
 170 {
 171         struct udf_inode_info *ei = (struct udf_inode_info *)foo;
 172
 173         ei->i_ext.i_data = NULL;
 174         inode_init_once(&ei->vfs_inode);
 175 }
 176
 177 static int __init init_inodecache(void)
 178 {
 179         udf_inode_cachep = kmem_cache_create("udf_inode_cache",
 180                                              sizeof(struct udf_inode_info),
 181                                              0, (SLAB_RECLAIM_ACCOUNT |
 182                                                  SLAB_MEM_SPREAD),
 183                                              init_once);
 184         if (!udf_inode_cachep)
 185                 return -ENOMEM;
 186         return 0;
 187 }
 188
 189 static void destroy_inodecache(void)
 190 {
 191         /*
 192          * Make sure all delayed rcu free inodes are flushed before we
 193          * destroy cache.
 194          */
 195         rcu_barrier();
 196         kmem_cache_destroy(udf_inode_cachep);
 197 }
 198
 199 /* Superblock operations */
 200 static const struct super_operations udf_sb_ops = {
 201         .alloc_inode    = udf_alloc_inode,
 202         .destroy_inode  = udf_destroy_inode,
 203         .write_inode    = udf_write_inode,
 204         .evict_inode    = udf_evict_inode,
 205         .put_super      = udf_put_super,
 206         .sync_fs        = udf_sync_fs,
 207         .statfs         = udf_statfs,
 208         .remount_fs     = udf_remount_fs,
 209         .show_options   = udf_show_options,
 210 };
 211
 212 struct udf_options {
 213         unsigned char novrs;
 214         unsigned int blocksize;
 215         unsigned int session;
 216         unsigned int lastblock;
 217         unsigned int anchor;
 218         unsigned int volume;
 219         unsigned short partition;
 220         unsigned int fileset;
 221         unsigned int rootdir;
 222         unsigned int flags;
 223         umode_t umask;
 224         kgid_t gid;
 225         kuid_t uid;
 226         umode_t fmode;
 227         umode_t dmode;
 228         struct nls_table *nls_map;
 229 };
 230
 231 static int __init init_udf_fs(void)
 232 {
 233         int err;
 234
 235         err = init_inodecache();
 236         if (err)
 237                 goto out1;
 238         err = register_filesystem(&udf_fstype);
 239         if (err)
 240                 goto out;
 241
 242         return 0;
 243
 244 out:
 245         destroy_inodecache();
 246
 247 out1:
 248         return err;
 249 }
 250
 251 static void __exit exit_udf_fs(void)
 252 {
 253         unregister_filesystem(&udf_fstype);
 254         destroy_inodecache();
 255 }
 256
 257 module_init(init_udf_fs)
 258 module_exit(exit_udf_fs)
 259
 260 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
 261 {
 262         struct udf_sb_info *sbi = UDF_SB(sb);
 263
 264         sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map),
 265                                   GFP_KERNEL);
 266         if (!sbi->s_partmaps) {
 267                 udf_err(sb, "Unable to allocate space for %d partition maps\n",
 268                         count);
 269                 sbi->s_partitions = 0;
 270                 return -ENOMEM;
 271         }
 272
 273         sbi->s_partitions = count;
 274         return 0;
 275 }
 276
 277 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
 278 {
 279         int i;
 280         int nr_groups = bitmap->s_nr_groups;
 281         int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
 282                                                 nr_groups);
 283
 284         for (i = 0; i < nr_groups; i++)
 285                 if (bitmap->s_block_bitmap[i])
 286                         brelse(bitmap->s_block_bitmap[i]);
 287
 288         if (size <= PAGE_SIZE)
 289                 kfree(bitmap);
 290         else
 291                 vfree(bitmap);
 292 }
 293
 294 static void udf_free_partition(struct udf_part_map *map)
 295 {
 296         int i;
 297         struct udf_meta_data *mdata;
 298
 299         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
 300                 iput(map->s_uspace.s_table);
 301         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
 302                 iput(map->s_fspace.s_table);
 303         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
 304                 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
 305         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
 306                 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
 307         if (map->s_partition_type == UDF_SPARABLE_MAP15)
 308                 for (i = 0; i < 4; i++)
 309                         brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
 310         else if (map->s_partition_type == UDF_METADATA_MAP25) {
 311                 mdata = &map->s_type_specific.s_metadata;
 312                 iput(mdata->s_metadata_fe);
 313                 mdata->s_metadata_fe = NULL;
 314
 315                 iput(mdata->s_mirror_fe);
 316                 mdata->s_mirror_fe = NULL;
 317
 318                 iput(mdata->s_bitmap_fe);
 319                 mdata->s_bitmap_fe = NULL;
 320         }
 321 }
 322
 323 static void udf_sb_free_partitions(struct super_block *sb)
 324 {
 325         struct udf_sb_info *sbi = UDF_SB(sb);
 326         int i;
 327         if (sbi->s_partmaps == NULL)
 328                 return;
 329         for (i = 0; i < sbi->s_partitions; i++)
 330                 udf_free_partition(&sbi->s_partmaps[i]);
 331         kfree(sbi->s_partmaps);
 332         sbi->s_partmaps = NULL;
 333 }
 334
 335 static int udf_show_options(struct seq_file *seq, struct dentry *root)
 336 {
 337         struct super_block *sb = root->d_sb;
 338         struct udf_sb_info *sbi = UDF_SB(sb);
 339
 340         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
 341                 seq_puts(seq, ",nostrict");
 342         if (UDF_QUERY_FLAG(sb, UDF_FLAG_BLOCKSIZE_SET))
 343                 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
 344         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
 345                 seq_puts(seq, ",unhide");
 346         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
 347                 seq_puts(seq, ",undelete");
 348         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
 349                 seq_puts(seq, ",noadinicb");
 350         if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
 351                 seq_puts(seq, ",shortad");
 352         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
 353                 seq_puts(seq, ",uid=forget");
 354         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_IGNORE))
 355                 seq_puts(seq, ",uid=ignore");
 356         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
 357                 seq_puts(seq, ",gid=forget");
 358         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE))
 359                 seq_puts(seq, ",gid=ignore");
 360         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
 361                 seq_printf(seq, ",uid=%u", from_kuid(&init_user_ns, sbi->s_uid));
 362         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
 363                 seq_printf(seq, ",gid=%u", from_kgid(&init_user_ns, sbi->s_gid));
 364         if (sbi->s_umask != 0)
 365                 seq_printf(seq, ",umask=%ho", sbi->s_umask);
 366         if (sbi->s_fmode != UDF_INVALID_MODE)
 367                 seq_printf(seq, ",mode=%ho", sbi->s_fmode);
 368         if (sbi->s_dmode != UDF_INVALID_MODE)
 369                 seq_printf(seq, ",dmode=%ho", sbi->s_dmode);
 370         if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
 371                 seq_printf(seq, ",session=%u", sbi->s_session);
 372         if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
 373                 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
 374         if (sbi->s_anchor != 0)
 375                 seq_printf(seq, ",anchor=%u", sbi->s_anchor);
 376         /*
 377          * volume, partition, fileset and rootdir seem to be ignored
 378          * currently
 379          */
 380         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
 381                 seq_puts(seq, ",utf8");
 382         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
 383                 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
 384
 385         return 0;
 386 }
 387
 388 /*
 389  * udf_parse_options
 390  *
 391  * PURPOSE
 392  *      Parse mount options.
 393  *
 394  * DESCRIPTION
 395  *      The following mount options are supported:
 396  *
 397  *      gid=            Set the default group.
 398  *      umask=          Set the default umask.
 399  *      mode=           Set the default file permissions.
 400  *      dmode=          Set the default directory permissions.
 401  *      uid=            Set the default user.
 402  *      bs=             Set the block size.
 403  *      unhide          Show otherwise hidden files.
 404  *      undelete        Show deleted files in lists.
 405  *      adinicb         Embed data in the inode (default)
 406  *      noadinicb       Don't embed data in the inode
 407  *      shortad         Use short ad's
 408  *      longad          Use long ad's (default)
 409  *      nostrict        Unset strict conformance
 410  *      iocharset=      Set the NLS character set
 411  *
 412  *      The remaining are for debugging and disaster recovery:
 413  *
 414  *      novrs           Skip volume sequence recognition
 415  *
 416  *      The following expect a offset from 0.
 417  *
 418  *      session=        Set the CDROM session (default= last session)
 419  *      anchor=         Override standard anchor location. (default= 256)
 420  *      volume=         Override the VolumeDesc location. (unused)
 421  *      partition=      Override the PartitionDesc location. (unused)
 422  *      lastblock=      Set the last block of the filesystem/
 423  *
 424  *      The following expect a offset from the partition root.
 425  *
 426  *      fileset=        Override the fileset block location. (unused)
 427  *      rootdir=        Override the root directory location. (unused)
 428  *              WARNING: overriding the rootdir to a non-directory may
 429  *              yield highly unpredictable results.
 430  *
 431  * PRE-CONDITIONS
 432  *      options         Pointer to mount options string.
 433  *      uopts           Pointer to mount options variable.
 434  *
 435  * POST-CONDITIONS
 436  *      <return>        1       Mount options parsed okay.
 437  *      <return>        0       Error parsing mount options.
 438  *
 439  * HISTORY
 440  *      July 1, 1997 - Andrew E. Mileski
 441  *      Written, tested, and released.
 442  */
 443
 444 enum {
 445         Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
 446         Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
 447         Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
 448         Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
 449         Opt_rootdir, Opt_utf8, Opt_iocharset,
 450         Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore,
 451         Opt_fmode, Opt_dmode
 452 };
 453
 454 static const match_table_t tokens = {
 455         {Opt_novrs,     "novrs"},
 456         {Opt_nostrict,  "nostrict"},
 457         {Opt_bs,        "bs=%u"},
 458         {Opt_unhide,    "unhide"},
 459         {Opt_undelete,  "undelete"},
 460         {Opt_noadinicb, "noadinicb"},
 461         {Opt_adinicb,   "adinicb"},
 462         {Opt_shortad,   "shortad"},
 463         {Opt_longad,    "longad"},
 464         {Opt_uforget,   "uid=forget"},
 465         {Opt_uignore,   "uid=ignore"},
 466         {Opt_gforget,   "gid=forget"},
 467         {Opt_gignore,   "gid=ignore"},
 468         {Opt_gid,       "gid=%u"},
 469         {Opt_uid,       "uid=%u"},
 470         {Opt_umask,     "umask=%o"},
 471         {Opt_session,   "session=%u"},
 472         {Opt_lastblock, "lastblock=%u"},
 473         {Opt_anchor,    "anchor=%u"},
 474         {Opt_volume,    "volume=%u"},
 475         {Opt_partition, "partition=%u"},
 476         {Opt_fileset,   "fileset=%u"},
 477         {Opt_rootdir,   "rootdir=%u"},
 478         {Opt_utf8,      "utf8"},
 479         {Opt_iocharset, "iocharset=%s"},
 480         {Opt_fmode,     "mode=%o"},
 481         {Opt_dmode,     "dmode=%o"},
 482         {Opt_err,       NULL}
 483 };
 484
 485 static int udf_parse_options(char *options, struct udf_options *uopt,
 486                              bool remount)
 487 {
 488         char *p;
 489         int option;
 490
 491         uopt->novrs = 0;
 492         uopt->partition = 0xFFFF;
 493         uopt->session = 0xFFFFFFFF;
 494         uopt->lastblock = 0;
 495         uopt->anchor = 0;
 496         uopt->volume = 0xFFFFFFFF;
 497         uopt->rootdir = 0xFFFFFFFF;
 498         uopt->fileset = 0xFFFFFFFF;
 499         uopt->nls_map = NULL;
 500
 501         if (!options)
 502                 return 1;
 503
 504         while ((p = strsep(&options, ",")) != NULL) {
 505                 substring_t args[MAX_OPT_ARGS];
 506                 int token;
 507                 unsigned n;
 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                         n = option;
 520                         if (n != 512 && n != 1024 && n != 2048 && n != 4096)
 521                                 return 0;
 522                         uopt->blocksize = n;
 523                         uopt->flags |= (1 << UDF_FLAG_BLOCKSIZE_SET);
 524                         break;
 525                 case Opt_unhide:
 526                         uopt->flags |= (1 << UDF_FLAG_UNHIDE);
 527                         break;
 528                 case Opt_undelete:
 529                         uopt->flags |= (1 << UDF_FLAG_UNDELETE);
 530                         break;
 531                 case Opt_noadinicb:
 532                         uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
 533                         break;
 534                 case Opt_adinicb:
 535                         uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
 536                         break;
 537                 case Opt_shortad:
 538                         uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
 539                         break;
 540                 case Opt_longad:
 541                         uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
 542                         break;
 543                 case Opt_gid:
 544                         if (match_int(args, &option))
 545                                 return 0;
 546                         uopt->gid = make_kgid(current_user_ns(), option);
 547                         if (!gid_valid(uopt->gid))
 548                                 return 0;
 549                         uopt->flags |= (1 << UDF_FLAG_GID_SET);
 550                         break;
 551                 case Opt_uid:
 552                         if (match_int(args, &option))
 553                                 return 0;
 554                         uopt->uid = make_kuid(current_user_ns(), option);
 555                         if (!uid_valid(uopt->uid))
 556                                 return 0;
 557                         uopt->flags |= (1 << UDF_FLAG_UID_SET);
 558                         break;
 559                 case Opt_umask:
 560                         if (match_octal(args, &option))
 561                                 return 0;
 562                         uopt->umask = option;
 563                         break;
 564                 case Opt_nostrict:
 565                         uopt->flags &= ~(1 << UDF_FLAG_STRICT);
 566                         break;
 567                 case Opt_session:
 568                         if (match_int(args, &option))
 569                                 return 0;
 570                         uopt->session = option;
 571                         if (!remount)
 572                                 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
 573                         break;
 574                 case Opt_lastblock:
 575                         if (match_int(args, &option))
 576                                 return 0;
 577                         uopt->lastblock = option;
 578                         if (!remount)
 579                                 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
 580                         break;
 581                 case Opt_anchor:
 582                         if (match_int(args, &option))
 583                                 return 0;
 584                         uopt->anchor = option;
 585                         break;
 586                 case Opt_volume:
 587                         if (match_int(args, &option))
 588                                 return 0;
 589                         uopt->volume = option;
 590                         break;
 591                 case Opt_partition:
 592                         if (match_int(args, &option))
 593                                 return 0;
 594                         uopt->partition = option;
 595                         break;
 596                 case Opt_fileset:
 597                         if (match_int(args, &option))
 598                                 return 0;
 599                         uopt->fileset = option;
 600                         break;
 601                 case Opt_rootdir:
 602                         if (match_int(args, &option))
 603                                 return 0;
 604                         uopt->rootdir = option;
 605                         break;
 606                 case Opt_utf8:
 607                         uopt->flags |= (1 << UDF_FLAG_UTF8);
 608                         break;
 609 #ifdef CONFIG_UDF_NLS
 610                 case Opt_iocharset:
 611                         uopt->nls_map = load_nls(args[0].from);
 612                         uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
 613                         break;
 614 #endif
 615                 case Opt_uignore:
 616                         uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
 617                         break;
 618                 case Opt_uforget:
 619                         uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
 620                         break;
 621                 case Opt_gignore:
 622                         uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
 623                         break;
 624                 case Opt_gforget:
 625                         uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
 626                         break;
 627                 case Opt_fmode:
 628                         if (match_octal(args, &option))
 629                                 return 0;
 630                         uopt->fmode = option & 0777;
 631                         break;
 632                 case Opt_dmode:
 633                         if (match_octal(args, &option))
 634                                 return 0;
 635                         uopt->dmode = option & 0777;
 636                         break;
 637                 default:
 638                         pr_err("bad mount option \"%s\" or missing value\n", p);
 639                         return 0;
 640                 }
 641         }
 642         return 1;
 643 }
 644
 645 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
 646 {
 647         struct udf_options uopt;
 648         struct udf_sb_info *sbi = UDF_SB(sb);
 649         int error = 0;
 650         struct logicalVolIntegrityDescImpUse *lvidiu = udf_sb_lvidiu(sb);
 651
 652         sync_filesystem(sb);
 653         if (lvidiu) {
 654                 int write_rev = le16_to_cpu(lvidiu->minUDFWriteRev);
 655                 if (write_rev > UDF_MAX_WRITE_VERSION && !(*flags & MS_RDONLY))
 656                         return -EACCES;
 657         }
 658
 659         uopt.flags = sbi->s_flags;
 660         uopt.uid   = sbi->s_uid;
 661         uopt.gid   = sbi->s_gid;
 662         uopt.umask = sbi->s_umask;
 663         uopt.fmode = sbi->s_fmode;
 664         uopt.dmode = sbi->s_dmode;
 665
 666         if (!udf_parse_options(options, &uopt, true))
 667                 return -EINVAL;
 668
 669         write_lock(&sbi->s_cred_lock);
 670         sbi->s_flags = uopt.flags;
 671         sbi->s_uid   = uopt.uid;
 672         sbi->s_gid   = uopt.gid;
 673         sbi->s_umask = uopt.umask;
 674         sbi->s_fmode = uopt.fmode;
 675         sbi->s_dmode = uopt.dmode;
 676         write_unlock(&sbi->s_cred_lock);
 677
 678         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 679                 goto out_unlock;
 680
 681         if (*flags & MS_RDONLY)
 682                 udf_close_lvid(sb);
 683         else
 684                 udf_open_lvid(sb);
 685
 686 out_unlock:
 687         return error;
 688 }
 689
 690 /* Check Volume Structure Descriptors (ECMA 167 2/9.1) */
 691 /* We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
 692 static loff_t udf_check_vsd(struct super_block *sb)
 693 {
 694         struct volStructDesc *vsd = NULL;
 695         loff_t sector = VSD_FIRST_SECTOR_OFFSET;
 696         int sectorsize;
 697         struct buffer_head *bh = NULL;
 698         int nsr02 = 0;
 699         int nsr03 = 0;
 700         struct udf_sb_info *sbi;
 701
 702         sbi = UDF_SB(sb);
 703         if (sb->s_blocksize < sizeof(struct volStructDesc))
 704                 sectorsize = sizeof(struct volStructDesc);
 705         else
 706                 sectorsize = sb->s_blocksize;
 707
 708         sector += (sbi->s_session << sb->s_blocksize_bits);
 709
 710         udf_debug("Starting at sector %u (%ld byte sectors)\n",
 711                   (unsigned int)(sector >> sb->s_blocksize_bits),
 712                   sb->s_blocksize);
 713         /* Process the sequence (if applicable). The hard limit on the sector
 714          * offset is arbitrary, hopefully large enough so that all valid UDF
 715          * filesystems will be recognised. There is no mention of an upper
 716          * bound to the size of the volume recognition area in the standard.
 717          *  The limit will prevent the code to read all the sectors of a
 718          * specially crafted image (like a bluray disc full of CD001 sectors),
 719          * potentially causing minutes or even hours of uninterruptible I/O
 720          * activity. This actually happened with uninitialised SSD partitions
 721          * (all 0xFF) before the check for the limit and all valid IDs were
 722          * added */
 723         for (; !nsr02 && !nsr03 && sector < VSD_MAX_SECTOR_OFFSET;
 724              sector += sectorsize) {
 725                 /* Read a block */
 726                 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
 727                 if (!bh)
 728                         break;
 729
 730                 /* Look for ISO  descriptors */
 731                 vsd = (struct volStructDesc *)(bh->b_data +
 732                                               (sector & (sb->s_blocksize - 1)));
 733
 734                 if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
 735                                     VSD_STD_ID_LEN)) {
 736                         switch (vsd->structType) {
 737                         case 0:
 738                                 udf_debug("ISO9660 Boot Record found\n");
 739                                 break;
 740                         case 1:
 741                                 udf_debug("ISO9660 Primary Volume Descriptor found\n");
 742                                 break;
 743                         case 2:
 744                                 udf_debug("ISO9660 Supplementary Volume Descriptor found\n");
 745                                 break;
 746                         case 3:
 747                                 udf_debug("ISO9660 Volume Partition Descriptor found\n");
 748                                 break;
 749                         case 255:
 750                                 udf_debug("ISO9660 Volume Descriptor Set Terminator found\n");
 751                                 break;
 752                         default:
 753                                 udf_debug("ISO9660 VRS (%u) found\n",
 754                                           vsd->structType);
 755                                 break;
 756                         }
 757                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
 758                                     VSD_STD_ID_LEN))
 759                         ; /* nothing */
 760                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
 761                                     VSD_STD_ID_LEN)) {
 762                         brelse(bh);
 763                         break;
 764                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
 765                                     VSD_STD_ID_LEN))
 766                         nsr02 = sector;
 767                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
 768                                     VSD_STD_ID_LEN))
 769                         nsr03 = sector;
 770                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BOOT2,
 771                                     VSD_STD_ID_LEN))
 772                         ; /* nothing */
 773                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CDW02,
 774                                     VSD_STD_ID_LEN))
 775                         ; /* nothing */
 776                 else {
 777                         /* invalid id : end of volume recognition area */
 778                         brelse(bh);
 779                         break;
 780                 }
 781                 brelse(bh);
 782         }
 783
 784         if (nsr03)
 785                 return nsr03;
 786         else if (nsr02)
 787                 return nsr02;
 788         else if (!bh && sector - (sbi->s_session << sb->s_blocksize_bits) ==
 789                         VSD_FIRST_SECTOR_OFFSET)
 790                 return -1;
 791         else
 792                 return 0;
 793 }
 794
 795 static int udf_find_fileset(struct super_block *sb,
 796                             struct kernel_lb_addr *fileset,
 797                             struct kernel_lb_addr *root)
 798 {
 799         struct buffer_head *bh = NULL;
 800         long lastblock;
 801         uint16_t ident;
 802         struct udf_sb_info *sbi;
 803
 804         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
 805             fileset->partitionReferenceNum != 0xFFFF) {
 806                 bh = udf_read_ptagged(sb, fileset, 0, &ident);
 807
 808                 if (!bh) {
 809                         return 1;
 810                 } else if (ident != TAG_IDENT_FSD) {
 811                         brelse(bh);
 812                         return 1;
 813                 }
 814
 815         }
 816
 817         sbi = UDF_SB(sb);
 818         if (!bh) {
 819                 /* Search backwards through the partitions */
 820                 struct kernel_lb_addr newfileset;
 821
 822 /* --> cvg: FIXME - is it reasonable? */
 823                 return 1;
 824
 825                 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
 826                      (newfileset.partitionReferenceNum != 0xFFFF &&
 827                       fileset->logicalBlockNum == 0xFFFFFFFF &&
 828                       fileset->partitionReferenceNum == 0xFFFF);
 829                      newfileset.partitionReferenceNum--) {
 830                         lastblock = sbi->s_partmaps
 831                                         [newfileset.partitionReferenceNum]
 832                                                 .s_partition_len;
 833                         newfileset.logicalBlockNum = 0;
 834
 835                         do {
 836                                 bh = udf_read_ptagged(sb, &newfileset, 0,
 837                                                       &ident);
 838                                 if (!bh) {
 839                                         newfileset.logicalBlockNum++;
 840                                         continue;
 841                                 }
 842
 843                                 switch (ident) {
 844                                 case TAG_IDENT_SBD:
 845                                 {
 846                                         struct spaceBitmapDesc *sp;
 847                                         sp = (struct spaceBitmapDesc *)
 848                                                                 bh->b_data;
 849                                         newfileset.logicalBlockNum += 1 +
 850                                                 ((le32_to_cpu(sp->numOfBytes) +
 851                                                   sizeof(struct spaceBitmapDesc)
 852                                                   - 1) >> sb->s_blocksize_bits);
 853                                         brelse(bh);
 854                                         break;
 855                                 }
 856                                 case TAG_IDENT_FSD:
 857                                         *fileset = newfileset;
 858                                         break;
 859                                 default:
 860                                         newfileset.logicalBlockNum++;
 861                                         brelse(bh);
 862                                         bh = NULL;
 863                                         break;
 864                                 }
 865                         } while (newfileset.logicalBlockNum < lastblock &&
 866                                  fileset->logicalBlockNum == 0xFFFFFFFF &&
 867                                  fileset->partitionReferenceNum == 0xFFFF);
 868                 }
 869         }
 870
 871         if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
 872              fileset->partitionReferenceNum != 0xFFFF) && bh) {
 873                 udf_debug("Fileset at block=%d, partition=%d\n",
 874                           fileset->logicalBlockNum,
 875                           fileset->partitionReferenceNum);
 876
 877                 sbi->s_partition = fileset->partitionReferenceNum;
 878                 udf_load_fileset(sb, bh, root);
 879                 brelse(bh);
 880                 return 0;
 881         }
 882         return 1;
 883 }
 884
 885 /*
 886  * Load primary Volume Descriptor Sequence
 887  *
 888  * Return <0 on error, 0 on success. -EAGAIN is special meaning next sequence
 889  * should be tried.
 890  */
 891 static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
 892 {
 893         struct primaryVolDesc *pvoldesc;
 894         struct ustr *instr, *outstr;
 895         struct buffer_head *bh;
 896         uint16_t ident;
 897         int ret = -ENOMEM;
 898
 899         instr = kmalloc(sizeof(struct ustr), GFP_NOFS);
 900         if (!instr)
 901                 return -ENOMEM;
 902
 903         outstr = kmalloc(sizeof(struct ustr), GFP_NOFS);
 904         if (!outstr)
 905                 goto out1;
 906
 907         bh = udf_read_tagged(sb, block, block, &ident);
 908         if (!bh) {
 909                 ret = -EAGAIN;
 910                 goto out2;
 911         }
 912
 913         if (ident != TAG_IDENT_PVD) {
 914                 ret = -EIO;
 915                 goto out_bh;
 916         }
 917
 918         pvoldesc = (struct primaryVolDesc *)bh->b_data;
 919
 920         if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
 921                               pvoldesc->recordingDateAndTime)) {
 922 #ifdef UDFFS_DEBUG
 923                 struct timestamp *ts = &pvoldesc->recordingDateAndTime;
 924                 udf_debug("recording time %04u/%02u/%02u %02u:%02u (%x)\n",
 925                           le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
 926                           ts->minute, le16_to_cpu(ts->typeAndTimezone));
 927 #endif
 928         }
 929
 930         if (!udf_build_ustr(instr, pvoldesc->volIdent, 32)) {
 931                 ret = udf_CS0toUTF8(outstr, instr);
 932                 if (ret < 0)
 933                         goto out_bh;
 934
 935                 strncpy(UDF_SB(sb)->s_volume_ident, outstr->u_name,
 936                         outstr->u_len > 31 ? 31 : outstr->u_len);
 937                 udf_debug("volIdent[] = '%s'\n", UDF_SB(sb)->s_volume_ident);
 938         }
 939
 940         if (!udf_build_ustr(instr, pvoldesc->volSetIdent, 128)) {
 941                 ret = udf_CS0toUTF8(outstr, instr);
 942                 if (ret < 0)
 943                         goto out_bh;
 944
 945                 udf_debug("volSetIdent[] = '%s'\n", outstr->u_name);
 946         }
 947
 948         ret = 0;
 949 out_bh:
 950         brelse(bh);
 951 out2:
 952         kfree(outstr);
 953 out1:
 954         kfree(instr);
 955         return ret;
 956 }
 957
 958 struct inode *udf_find_metadata_inode_efe(struct super_block *sb,
 959                                         u32 meta_file_loc, u32 partition_num)
 960 {
 961         struct kernel_lb_addr addr;
 962         struct inode *metadata_fe;
 963
 964         addr.logicalBlockNum = meta_file_loc;
 965         addr.partitionReferenceNum = partition_num;
 966
 967         metadata_fe = udf_iget_special(sb, &addr);
 968
 969         if (IS_ERR(metadata_fe)) {
 970                 udf_warn(sb, "metadata inode efe not found\n");
 971                 return metadata_fe;
 972         }
 973         if (UDF_I(metadata_fe)->i_alloc_type != ICBTAG_FLAG_AD_SHORT) {
 974                 udf_warn(sb, "metadata inode efe does not have short allocation descriptors!\n");
 975                 iput(metadata_fe);
 976                 return ERR_PTR(-EIO);
 977         }
 978
 979         return metadata_fe;
 980 }
 981
 982 static int udf_load_metadata_files(struct super_block *sb, int partition)
 983 {
 984         struct udf_sb_info *sbi = UDF_SB(sb);
 985         struct udf_part_map *map;
 986         struct udf_meta_data *mdata;
 987         struct kernel_lb_addr addr;
 988         struct inode *fe;
 989
 990         map = &sbi->s_partmaps[partition];
 991         mdata = &map->s_type_specific.s_metadata;
 992
 993         /* metadata address */
 994         udf_debug("Metadata file location: block = %d part = %d\n",
 995                   mdata->s_meta_file_loc, map->s_partition_num);
 996
 997         fe = udf_find_metadata_inode_efe(sb, mdata->s_meta_file_loc,
 998                                          map->s_partition_num);
 999         if (IS_ERR(fe)) {
1000                 /* mirror file entry */
1001                 udf_debug("Mirror metadata file location: block = %d part = %d\n",
1002                           mdata->s_mirror_file_loc, map->s_partition_num);
1003
1004                 fe = udf_find_metadata_inode_efe(sb, mdata->s_mirror_file_loc,
1005                                                  map->s_partition_num);
1006
1007                 if (IS_ERR(fe)) {
1008                         udf_err(sb, "Both metadata and mirror metadata inode efe can not found\n");
1009                         return PTR_ERR(fe);
1010                 }
1011                 mdata->s_mirror_fe = fe;
1012         } else
1013                 mdata->s_metadata_fe = fe;
1014
1015
1016         /*
1017          * bitmap file entry
1018          * Note:
1019          * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
1020         */
1021         if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
1022                 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
1023                 addr.partitionReferenceNum = map->s_partition_num;
1024
1025                 udf_debug("Bitmap file location: block = %d part = %d\n",
1026                           addr.logicalBlockNum, addr.partitionReferenceNum);
1027
1028                 fe = udf_iget_special(sb, &addr);
1029                 if (IS_ERR(fe)) {
1030                         if (sb->s_flags & MS_RDONLY)
1031                                 udf_warn(sb, "bitmap inode efe not found but it's ok since the disc is mounted read-only\n");
1032                         else {
1033                                 udf_err(sb, "bitmap inode efe not found and attempted read-write mount\n");
1034                                 return PTR_ERR(fe);
1035                         }
1036                 } else
1037                         mdata->s_bitmap_fe = fe;
1038         }
1039
1040         udf_debug("udf_load_metadata_files Ok\n");
1041         return 0;
1042 }
1043
1044 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
1045                              struct kernel_lb_addr *root)
1046 {
1047         struct fileSetDesc *fset;
1048
1049         fset = (struct fileSetDesc *)bh->b_data;
1050
1051         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
1052
1053         UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
1054
1055         udf_debug("Rootdir at block=%d, partition=%d\n",
1056                   root->logicalBlockNum, root->partitionReferenceNum);
1057 }
1058
1059 int udf_compute_nr_groups(struct super_block *sb, u32 partition)
1060 {
1061         struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
1062         return DIV_ROUND_UP(map->s_partition_len +
1063                             (sizeof(struct spaceBitmapDesc) << 3),
1064                             sb->s_blocksize * 8);
1065 }
1066
1067 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
1068 {
1069         struct udf_bitmap *bitmap;
1070         int nr_groups;
1071         int size;
1072
1073         nr_groups = udf_compute_nr_groups(sb, index);
1074         size = sizeof(struct udf_bitmap) +
1075                 (sizeof(struct buffer_head *) * nr_groups);
1076
1077         if (size <= PAGE_SIZE)
1078                 bitmap = kzalloc(size, GFP_KERNEL);
1079         else
1080                 bitmap = vzalloc(size); /* TODO: get rid of vzalloc */
1081
1082         if (bitmap == NULL)
1083                 return NULL;
1084
1085         bitmap->s_nr_groups = nr_groups;
1086         return bitmap;
1087 }
1088
1089 static int udf_fill_partdesc_info(struct super_block *sb,
1090                 struct partitionDesc *p, int p_index)
1091 {
1092         struct udf_part_map *map;
1093         struct udf_sb_info *sbi = UDF_SB(sb);
1094         struct partitionHeaderDesc *phd;
1095
1096         map = &sbi->s_partmaps[p_index];
1097
1098         map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
1099         map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
1100
1101         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
1102                 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
1103         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
1104                 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
1105         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
1106                 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
1107         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
1108                 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
1109
1110         udf_debug("Partition (%d type %x) starts at physical %d, block length %d\n",
1111                   p_index, map->s_partition_type,
1112                   map->s_partition_root, map->s_partition_len);
1113
1114         if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1115             strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
1116                 return 0;
1117
1118         phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1119         if (phd->unallocSpaceTable.extLength) {
1120                 struct kernel_lb_addr loc = {
1121                         .logicalBlockNum = le32_to_cpu(
1122                                 phd->unallocSpaceTable.extPosition),
1123                         .partitionReferenceNum = p_index,
1124                 };
1125                 struct inode *inode;
1126
1127                 inode = udf_iget_special(sb, &loc);
1128                 if (IS_ERR(inode)) {
1129                         udf_debug("cannot load unallocSpaceTable (part %d)\n",
1130                                   p_index);
1131                         return PTR_ERR(inode);
1132                 }
1133                 map->s_uspace.s_table = inode;
1134                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1135                 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
1136                           p_index, map->s_uspace.s_table->i_ino);
1137         }
1138
1139         if (phd->unallocSpaceBitmap.extLength) {
1140                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1141                 if (!bitmap)
1142                         return -ENOMEM;
1143                 map->s_uspace.s_bitmap = bitmap;
1144                 bitmap->s_extPosition = le32_to_cpu(
1145                                 phd->unallocSpaceBitmap.extPosition);
1146                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1147                 udf_debug("unallocSpaceBitmap (part %d) @ %d\n",
1148                           p_index, bitmap->s_extPosition);
1149         }
1150
1151         if (phd->partitionIntegrityTable.extLength)
1152                 udf_debug("partitionIntegrityTable (part %d)\n", p_index);
1153
1154         if (phd->freedSpaceTable.extLength) {
1155                 struct kernel_lb_addr loc = {
1156                         .logicalBlockNum = le32_to_cpu(
1157                                 phd->freedSpaceTable.extPosition),
1158                         .partitionReferenceNum = p_index,
1159                 };
1160                 struct inode *inode;
1161
1162                 inode = udf_iget_special(sb, &loc);
1163                 if (IS_ERR(inode)) {
1164                         udf_debug("cannot load freedSpaceTable (part %d)\n",
1165                                   p_index);
1166                         return PTR_ERR(inode);
1167                 }
1168                 map->s_fspace.s_table = inode;
1169                 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
1170                 udf_debug("freedSpaceTable (part %d) @ %ld\n",
1171                           p_index, map->s_fspace.s_table->i_ino);
1172         }
1173
1174         if (phd->freedSpaceBitmap.extLength) {
1175                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1176                 if (!bitmap)
1177                         return -ENOMEM;
1178                 map->s_fspace.s_bitmap = bitmap;
1179                 bitmap->s_extPosition = le32_to_cpu(
1180                                 phd->freedSpaceBitmap.extPosition);
1181                 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1182                 udf_debug("freedSpaceBitmap (part %d) @ %d\n",
1183                           p_index, bitmap->s_extPosition);
1184         }
1185         return 0;
1186 }
1187
1188 static void udf_find_vat_block(struct super_block *sb, int p_index,
1189                                int type1_index, sector_t start_block)
1190 {
1191         struct udf_sb_info *sbi = UDF_SB(sb);
1192         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1193         sector_t vat_block;
1194         struct kernel_lb_addr ino;
1195         struct inode *inode;
1196
1197         /*
1198          * VAT file entry is in the last recorded block. Some broken disks have
1199          * it a few blocks before so try a bit harder...
1200          */
1201         ino.partitionReferenceNum = type1_index;
1202         for (vat_block = start_block;
1203              vat_block >= map->s_partition_root &&
1204              vat_block >= start_block - 3; vat_block--) {
1205                 ino.logicalBlockNum = vat_block - map->s_partition_root;
1206                 inode = udf_iget_special(sb, &ino);
1207                 if (!IS_ERR(inode)) {
1208                         sbi->s_vat_inode = inode;
1209                         break;
1210                 }
1211         }
1212 }
1213
1214 static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1215 {
1216         struct udf_sb_info *sbi = UDF_SB(sb);
1217         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1218         struct buffer_head *bh = NULL;
1219         struct udf_inode_info *vati;
1220         uint32_t pos;
1221         struct virtualAllocationTable20 *vat20;
1222         sector_t blocks = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
1223
1224         udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block);
1225         if (!sbi->s_vat_inode &&
1226             sbi->s_last_block != blocks - 1) {
1227                 pr_notice("Failed to read VAT inode from the last recorded block (%lu), retrying with the last block of the device (%lu).\n",
1228                           (unsigned long)sbi->s_last_block,
1229                           (unsigned long)blocks - 1);
1230                 udf_find_vat_block(sb, p_index, type1_index, blocks - 1);
1231         }
1232         if (!sbi->s_vat_inode)
1233                 return -EIO;
1234
1235         if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1236                 map->s_type_specific.s_virtual.s_start_offset = 0;
1237                 map->s_type_specific.s_virtual.s_num_entries =
1238                         (sbi->s_vat_inode->i_size - 36) >> 2;
1239         } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1240                 vati = UDF_I(sbi->s_vat_inode);
1241                 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1242                         pos = udf_block_map(sbi->s_vat_inode, 0);
1243                         bh = sb_bread(sb, pos);
1244                         if (!bh)
1245                                 return -EIO;
1246                         vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1247                 } else {
1248                         vat20 = (struct virtualAllocationTable20 *)
1249                                                         vati->i_ext.i_data;
1250                 }
1251
1252                 map->s_type_specific.s_virtual.s_start_offset =
1253                         le16_to_cpu(vat20->lengthHeader);
1254                 map->s_type_specific.s_virtual.s_num_entries =
1255                         (sbi->s_vat_inode->i_size -
1256                                 map->s_type_specific.s_virtual.
1257                                         s_start_offset) >> 2;
1258                 brelse(bh);
1259         }
1260         return 0;
1261 }
1262
1263 /*
1264  * Load partition descriptor block
1265  *
1266  * Returns <0 on error, 0 on success, -EAGAIN is special - try next descriptor
1267  * sequence.
1268  */
1269 static int udf_load_partdesc(struct super_block *sb, sector_t block)
1270 {
1271         struct buffer_head *bh;
1272         struct partitionDesc *p;
1273         struct udf_part_map *map;
1274         struct udf_sb_info *sbi = UDF_SB(sb);
1275         int i, type1_idx;
1276         uint16_t partitionNumber;
1277         uint16_t ident;
1278         int ret;
1279
1280         bh = udf_read_tagged(sb, block, block, &ident);
1281         if (!bh)
1282                 return -EAGAIN;
1283         if (ident != TAG_IDENT_PD) {
1284                 ret = 0;
1285                 goto out_bh;
1286         }
1287
1288         p = (struct partitionDesc *)bh->b_data;
1289         partitionNumber = le16_to_cpu(p->partitionNumber);
1290
1291         /* First scan for TYPE1, SPARABLE and METADATA partitions */
1292         for (i = 0; i < sbi->s_partitions; i++) {
1293                 map = &sbi->s_partmaps[i];
1294                 udf_debug("Searching map: (%d == %d)\n",
1295                           map->s_partition_num, partitionNumber);
1296                 if (map->s_partition_num == partitionNumber &&
1297                     (map->s_partition_type == UDF_TYPE1_MAP15 ||
1298                      map->s_partition_type == UDF_SPARABLE_MAP15))
1299                         break;
1300         }
1301
1302         if (i >= sbi->s_partitions) {
1303                 udf_debug("Partition (%d) not found in partition map\n",
1304                           partitionNumber);
1305                 ret = 0;
1306                 goto out_bh;
1307         }
1308
1309         ret = udf_fill_partdesc_info(sb, p, i);
1310         if (ret < 0)
1311                 goto out_bh;
1312
1313         /*
1314          * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1315          * PHYSICAL partitions are already set up
1316          */
1317         type1_idx = i;
1318 #ifdef UDFFS_DEBUG
1319         map = NULL; /* supress 'maybe used uninitialized' warning */
1320 #endif
1321         for (i = 0; i < sbi->s_partitions; i++) {
1322                 map = &sbi->s_partmaps[i];
1323
1324                 if (map->s_partition_num == partitionNumber &&
1325                     (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1326                      map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1327                      map->s_partition_type == UDF_METADATA_MAP25))
1328                         break;
1329         }
1330
1331         if (i >= sbi->s_partitions) {
1332                 ret = 0;
1333                 goto out_bh;
1334         }
1335
1336         ret = udf_fill_partdesc_info(sb, p, i);
1337         if (ret < 0)
1338                 goto out_bh;
1339
1340         if (map->s_partition_type == UDF_METADATA_MAP25) {
1341                 ret = udf_load_metadata_files(sb, i);
1342                 if (ret < 0) {
1343                         udf_err(sb, "error loading MetaData partition map %d\n",
1344                                 i);
1345                         goto out_bh;
1346                 }
1347         } else {
1348                 /*
1349                  * If we have a partition with virtual map, we don't handle
1350                  * writing to it (we overwrite blocks instead of relocating
1351                  * them).
1352                  */
1353                 if (!(sb->s_flags & MS_RDONLY)) {
1354                         ret = -EACCES;
1355                         goto out_bh;
1356                 }
1357                 ret = udf_load_vat(sb, i, type1_idx);
1358                 if (ret < 0)
1359                         goto out_bh;
1360         }
1361         ret = 0;
1362 out_bh:
1363         /* In case loading failed, we handle cleanup in udf_fill_super */
1364         brelse(bh);
1365         return ret;
1366 }
1367
1368 static int udf_load_sparable_map(struct super_block *sb,
1369                                  struct udf_part_map *map,
1370                                  struct sparablePartitionMap *spm)
1371 {
1372         uint32_t loc;
1373         uint16_t ident;
1374         struct sparingTable *st;
1375         struct udf_sparing_data *sdata = &map->s_type_specific.s_sparing;
1376         int i;
1377         struct buffer_head *bh;
1378
1379         map->s_partition_type = UDF_SPARABLE_MAP15;
1380         sdata->s_packet_len = le16_to_cpu(spm->packetLength);
1381         if (!is_power_of_2(sdata->s_packet_len)) {
1382                 udf_err(sb, "error loading logical volume descriptor: "
1383                         "Invalid packet length %u\n",
1384                         (unsigned)sdata->s_packet_len);
1385                 return -EIO;
1386         }
1387         if (spm->numSparingTables > 4) {
1388                 udf_err(sb, "error loading logical volume descriptor: "
1389                         "Too many sparing tables (%d)\n",
1390                         (int)spm->numSparingTables);
1391                 return -EIO;
1392         }
1393
1394         for (i = 0; i < spm->numSparingTables; i++) {
1395                 loc = le32_to_cpu(spm->locSparingTable[i]);
1396                 bh = udf_read_tagged(sb, loc, loc, &ident);
1397                 if (!bh)
1398                         continue;
1399
1400                 st = (struct sparingTable *)bh->b_data;
1401                 if (ident != 0 ||
1402                     strncmp(st->sparingIdent.ident, UDF_ID_SPARING,
1403                             strlen(UDF_ID_SPARING)) ||
1404                     sizeof(*st) + le16_to_cpu(st->reallocationTableLen) >
1405                                                         sb->s_blocksize) {
1406                         brelse(bh);
1407                         continue;
1408                 }
1409
1410                 sdata->s_spar_map[i] = bh;
1411         }
1412         map->s_partition_func = udf_get_pblock_spar15;
1413         return 0;
1414 }
1415
1416 static int udf_load_logicalvol(struct super_block *sb, sector_t block,
1417                                struct kernel_lb_addr *fileset)
1418 {
1419         struct logicalVolDesc *lvd;
1420         int i, offset;
1421         uint8_t type;
1422         struct udf_sb_info *sbi = UDF_SB(sb);
1423         struct genericPartitionMap *gpm;
1424         uint16_t ident;
1425         struct buffer_head *bh;
1426         unsigned int table_len;
1427         int ret;
1428
1429         bh = udf_read_tagged(sb, block, block, &ident);
1430         if (!bh)
1431                 return -EAGAIN;
1432         BUG_ON(ident != TAG_IDENT_LVD);
1433         lvd = (struct logicalVolDesc *)bh->b_data;
1434         table_len = le32_to_cpu(lvd->mapTableLength);
1435         if (table_len > sb->s_blocksize - sizeof(*lvd)) {
1436                 udf_err(sb, "error loading logical volume descriptor: "
1437                         "Partition table too long (%u > %lu)\n", table_len,
1438                         sb->s_blocksize - sizeof(*lvd));
1439                 ret = -EIO;
1440                 goto out_bh;
1441         }
1442
1443         ret = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1444         if (ret)
1445                 goto out_bh;
1446
1447         for (i = 0, offset = 0;
1448              i < sbi->s_partitions && offset < table_len;
1449              i++, offset += gpm->partitionMapLength) {
1450                 struct udf_part_map *map = &sbi->s_partmaps[i];
1451                 gpm = (struct genericPartitionMap *)
1452                                 &(lvd->partitionMaps[offset]);
1453                 type = gpm->partitionMapType;
1454                 if (type == 1) {
1455                         struct genericPartitionMap1 *gpm1 =
1456                                 (struct genericPartitionMap1 *)gpm;
1457                         map->s_partition_type = UDF_TYPE1_MAP15;
1458                         map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1459                         map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1460                         map->s_partition_func = NULL;
1461                 } else if (type == 2) {
1462                         struct udfPartitionMap2 *upm2 =
1463                                                 (struct udfPartitionMap2 *)gpm;
1464                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1465                                                 strlen(UDF_ID_VIRTUAL))) {
1466                                 u16 suf =
1467                                         le16_to_cpu(((__le16 *)upm2->partIdent.
1468                                                         identSuffix)[0]);
1469                                 if (suf < 0x0200) {
1470                                         map->s_partition_type =
1471                                                         UDF_VIRTUAL_MAP15;
1472                                         map->s_partition_func =
1473                                                         udf_get_pblock_virt15;
1474                                 } else {
1475                                         map->s_partition_type =
1476                                                         UDF_VIRTUAL_MAP20;
1477                                         map->s_partition_func =
1478                                                         udf_get_pblock_virt20;
1479                                 }
1480                         } else if (!strncmp(upm2->partIdent.ident,
1481                                                 UDF_ID_SPARABLE,
1482                                                 strlen(UDF_ID_SPARABLE))) {
1483                                 ret = udf_load_sparable_map(sb, map,
1484                                         (struct sparablePartitionMap *)gpm);
1485                                 if (ret < 0)
1486                                         goto out_bh;
1487                         } else if (!strncmp(upm2->partIdent.ident,
1488                                                 UDF_ID_METADATA,
1489                                                 strlen(UDF_ID_METADATA))) {
1490                                 struct udf_meta_data *mdata =
1491                                         &map->s_type_specific.s_metadata;
1492                                 struct metadataPartitionMap *mdm =
1493                                                 (struct metadataPartitionMap *)
1494                                                 &(lvd->partitionMaps[offset]);
1495                                 udf_debug("Parsing Logical vol part %d type %d  id=%s\n",
1496                                           i, type, UDF_ID_METADATA);
1497
1498                                 map->s_partition_type = UDF_METADATA_MAP25;
1499                                 map->s_partition_func = udf_get_pblock_meta25;
1500
1501                                 mdata->s_meta_file_loc   =
1502                                         le32_to_cpu(mdm->metadataFileLoc);
1503                                 mdata->s_mirror_file_loc =
1504                                         le32_to_cpu(mdm->metadataMirrorFileLoc);
1505                                 mdata->s_bitmap_file_loc =
1506                                         le32_to_cpu(mdm->metadataBitmapFileLoc);
1507                                 mdata->s_alloc_unit_size =
1508                                         le32_to_cpu(mdm->allocUnitSize);
1509                                 mdata->s_align_unit_size =
1510                                         le16_to_cpu(mdm->alignUnitSize);
1511                                 if (mdm->flags & 0x01)
1512                                         mdata->s_flags |= MF_DUPLICATE_MD;
1513
1514                                 udf_debug("Metadata Ident suffix=0x%x\n",
1515                                           le16_to_cpu(*(__le16 *)
1516                                                       mdm->partIdent.identSuffix));
1517                                 udf_debug("Metadata part num=%d\n",
1518                                           le16_to_cpu(mdm->partitionNum));
1519                                 udf_debug("Metadata part alloc unit size=%d\n",
1520                                           le32_to_cpu(mdm->allocUnitSize));
1521                                 udf_debug("Metadata file loc=%d\n",
1522                                           le32_to_cpu(mdm->metadataFileLoc));
1523                                 udf_debug("Mirror file loc=%d\n",
1524                                           le32_to_cpu(mdm->metadataMirrorFileLoc));
1525                                 udf_debug("Bitmap file loc=%d\n",
1526                                           le32_to_cpu(mdm->metadataBitmapFileLoc));
1527                                 udf_debug("Flags: %d %d\n",
1528                                           mdata->s_flags, mdm->flags);
1529                         } else {
1530                                 udf_debug("Unknown ident: %s\n",
1531                                           upm2->partIdent.ident);
1532                                 continue;
1533                         }
1534                         map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1535                         map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1536                 }
1537                 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1538                           i, map->s_partition_num, type, map->s_volumeseqnum);
1539         }
1540
1541         if (fileset) {
1542                 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
1543
1544                 *fileset = lelb_to_cpu(la->extLocation);
1545                 udf_debug("FileSet found in LogicalVolDesc at block=%d, partition=%d\n",
1546                           fileset->logicalBlockNum,
1547                           fileset->partitionReferenceNum);
1548         }
1549         if (lvd->integritySeqExt.extLength)
1550                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1551         ret = 0;
1552 out_bh:
1553         brelse(bh);
1554         return ret;
1555 }
1556
1557 /*
1558  * udf_load_logicalvolint
1559  *
1560  */
1561 static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
1562 {
1563         struct buffer_head *bh = NULL;
1564         uint16_t ident;
1565         struct udf_sb_info *sbi = UDF_SB(sb);
1566         struct logicalVolIntegrityDesc *lvid;
1567
1568         while (loc.extLength > 0 &&
1569                (bh = udf_read_tagged(sb, loc.extLocation,
1570                                      loc.extLocation, &ident)) &&
1571                ident == TAG_IDENT_LVID) {
1572                 sbi->s_lvid_bh = bh;
1573                 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1574
1575                 if (lvid->nextIntegrityExt.extLength)
1576                         udf_load_logicalvolint(sb,
1577                                 leea_to_cpu(lvid->nextIntegrityExt));
1578
1579                 if (sbi->s_lvid_bh != bh)
1580                         brelse(bh);
1581                 loc.extLength -= sb->s_blocksize;
1582                 loc.extLocation++;
1583         }
1584         if (sbi->s_lvid_bh != bh)
1585                 brelse(bh);
1586 }
1587
1588 /*
1589  * Process a main/reserve volume descriptor sequence.
1590  *   @block             First block of first extent of the sequence.
1591  *   @lastblock         Lastblock of first extent of the sequence.
1592  *   @fileset           There we store extent containing root fileset
1593  *
1594  * Returns <0 on error, 0 on success. -EAGAIN is special - try next descriptor
1595  * sequence
1596  */
1597 static noinline int udf_process_sequence(
1598                 struct super_block *sb,
1599                 sector_t block, sector_t lastblock,
1600                 struct kernel_lb_addr *fileset)
1601 {
1602         struct buffer_head *bh = NULL;
1603         struct udf_vds_record vds[VDS_POS_LENGTH];
1604         struct udf_vds_record *curr;
1605         struct generic_desc *gd;
1606         struct volDescPtr *vdp;
1607         bool done = false;
1608         uint32_t vdsn;
1609         uint16_t ident;
1610         long next_s = 0, next_e = 0;
1611         int ret;
1612
1613         memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1614
1615         /*
1616          * Read the main descriptor sequence and find which descriptors
1617          * are in it.
1618          */
1619         for (; (!done && block <= lastblock); block++) {
1620
1621                 bh = udf_read_tagged(sb, block, block, &ident);
1622                 if (!bh) {
1623                         udf_err(sb,
1624                                 "Block %llu of volume descriptor sequence is corrupted or we could not read it\n",
1625                                 (unsigned long long)block);
1626                         return -EAGAIN;
1627                 }
1628
1629                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1630                 gd = (struct generic_desc *)bh->b_data;
1631                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1632                 switch (ident) {
1633                 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1634                         curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1635                         if (vdsn >= curr->volDescSeqNum) {
1636                                 curr->volDescSeqNum = vdsn;
1637                                 curr->block = block;
1638                         }
1639                         break;
1640                 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1641                         curr = &vds[VDS_POS_VOL_DESC_PTR];
1642                         if (vdsn >= curr->volDescSeqNum) {
1643                                 curr->volDescSeqNum = vdsn;
1644                                 curr->block = block;
1645
1646                                 vdp = (struct volDescPtr *)bh->b_data;
1647                                 next_s = le32_to_cpu(
1648                                         vdp->nextVolDescSeqExt.extLocation);
1649                                 next_e = le32_to_cpu(
1650                                         vdp->nextVolDescSeqExt.extLength);
1651                                 next_e = next_e >> sb->s_blocksize_bits;
1652                                 next_e += next_s;
1653                         }
1654                         break;
1655                 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1656                         curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1657                         if (vdsn >= curr->volDescSeqNum) {
1658                                 curr->volDescSeqNum = vdsn;
1659                                 curr->block = block;
1660                         }
1661                         break;
1662                 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1663                         curr = &vds[VDS_POS_PARTITION_DESC];
1664                         if (!curr->block)
1665                                 curr->block = block;
1666                         break;
1667                 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1668                         curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1669                         if (vdsn >= curr->volDescSeqNum) {
1670                                 curr->volDescSeqNum = vdsn;
1671                                 curr->block = block;
1672                         }
1673                         break;
1674                 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1675                         curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1676                         if (vdsn >= curr->volDescSeqNum) {
1677                                 curr->volDescSeqNum = vdsn;
1678                                 curr->block = block;
1679                         }
1680                         break;
1681                 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1682                         vds[VDS_POS_TERMINATING_DESC].block = block;
1683                         if (next_e) {
1684                                 block = next_s;
1685                                 lastblock = next_e;
1686                                 next_s = next_e = 0;
1687                         } else
1688                                 done = true;
1689                         break;
1690                 }
1691                 brelse(bh);
1692         }
1693         /*
1694          * Now read interesting descriptors again and process them
1695          * in a suitable order
1696          */
1697         if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1698                 udf_err(sb, "Primary Volume Descriptor not found!\n");
1699                 return -EAGAIN;
1700         }
1701         ret = udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block);
1702         if (ret < 0)
1703                 return ret;
1704
1705         if (vds[VDS_POS_LOGICAL_VOL_DESC].block) {
1706                 ret = udf_load_logicalvol(sb,
1707                                           vds[VDS_POS_LOGICAL_VOL_DESC].block,
1708                                           fileset);
1709                 if (ret < 0)
1710                         return ret;
1711         }
1712
1713         if (vds[VDS_POS_PARTITION_DESC].block) {
1714                 /*
1715                  * We rescan the whole descriptor sequence to find
1716                  * partition descriptor blocks and process them.
1717                  */
1718                 for (block = vds[VDS_POS_PARTITION_DESC].block;
1719                      block < vds[VDS_POS_TERMINATING_DESC].block;
1720                      block++) {
1721                         ret = udf_load_partdesc(sb, block);
1722                         if (ret < 0)
1723                                 return ret;
1724                 }
1725         }
1726
1727         return 0;
1728 }
1729
1730 /*
1731  * Load Volume Descriptor Sequence described by anchor in bh
1732  *
1733  * Returns <0 on error, 0 on success
1734  */
1735 static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh,
1736                              struct kernel_lb_addr *fileset)
1737 {
1738         struct anchorVolDescPtr *anchor;
1739         sector_t main_s, main_e, reserve_s, reserve_e;
1740         int ret;
1741
1742         anchor = (struct anchorVolDescPtr *)bh->b_data;
1743
1744         /* Locate the main sequence */
1745         main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1746         main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1747         main_e = main_e >> sb->s_blocksize_bits;
1748         main_e += main_s;
1749
1750         /* Locate the reserve sequence */
1751         reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1752         reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1753         reserve_e = reserve_e >> sb->s_blocksize_bits;
1754         reserve_e += reserve_s;
1755
1756         /* Process the main & reserve sequences */
1757         /* responsible for finding the PartitionDesc(s) */
1758         ret = udf_process_sequence(sb, main_s, main_e, fileset);
1759         if (ret != -EAGAIN)
1760                 return ret;
1761         udf_sb_free_partitions(sb);
1762         ret = udf_process_sequence(sb, reserve_s, reserve_e, fileset);
1763         if (ret < 0) {
1764                 udf_sb_free_partitions(sb);
1765                 /* No sequence was OK, return -EIO */
1766                 if (ret == -EAGAIN)
1767                         ret = -EIO;
1768         }
1769         return ret;
1770 }
1771
1772 /*
1773  * Check whether there is an anchor block in the given block and
1774  * load Volume Descriptor Sequence if so.
1775  *
1776  * Returns <0 on error, 0 on success, -EAGAIN is special - try next anchor
1777  * block
1778  */
1779 static int udf_check_anchor_block(struct super_block *sb, sector_t block,
1780                                   struct kernel_lb_addr *fileset)
1781 {
1782         struct buffer_head *bh;
1783         uint16_t ident;
1784         int ret;
1785
1786         if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
1787             udf_fixed_to_variable(block) >=
1788             sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits)
1789                 return -EAGAIN;
1790
1791         bh = udf_read_tagged(sb, block, block, &ident);
1792         if (!bh)
1793                 return -EAGAIN;
1794         if (ident != TAG_IDENT_AVDP) {
1795                 brelse(bh);
1796                 return -EAGAIN;
1797         }
1798         ret = udf_load_sequence(sb, bh, fileset);
1799         brelse(bh);
1800         return ret;
1801 }
1802
1803 /*
1804  * Search for an anchor volume descriptor pointer.
1805  *
1806  * Returns < 0 on error, 0 on success. -EAGAIN is special - try next set
1807  * of anchors.
1808  */
1809 static int udf_scan_anchors(struct super_block *sb, sector_t *lastblock,
1810                             struct kernel_lb_addr *fileset)
1811 {
1812         sector_t last[6];
1813         int i;
1814         struct udf_sb_info *sbi = UDF_SB(sb);
1815         int last_count = 0;
1816         int ret;
1817
1818         /* First try user provided anchor */
1819         if (sbi->s_anchor) {
1820                 ret = udf_check_anchor_block(sb, sbi->s_anchor, fileset);
1821                 if (ret != -EAGAIN)
1822                         return ret;
1823         }
1824         /*
1825          * according to spec, anchor is in either:
1826          *     block 256
1827          *     lastblock-256
1828          *     lastblock
1829          *  however, if the disc isn't closed, it could be 512.
1830          */
1831         ret = udf_check_anchor_block(sb, sbi->s_session + 256, fileset);
1832         if (ret != -EAGAIN)
1833                 return ret;
1834         /*
1835          * The trouble is which block is the last one. Drives often misreport
1836          * this so we try various possibilities.
1837          */
1838         last[last_count++] = *lastblock;
1839         if (*lastblock >= 1)
1840                 last[last_count++] = *lastblock - 1;
1841         last[last_count++] = *lastblock + 1;
1842         if (*lastblock >= 2)
1843                 last[last_count++] = *lastblock - 2;
1844         if (*lastblock >= 150)
1845                 last[last_count++] = *lastblock - 150;
1846         if (*lastblock >= 152)
1847                 last[last_count++] = *lastblock - 152;
1848
1849         for (i = 0; i < last_count; i++) {
1850                 if (last[i] >= sb->s_bdev->bd_inode->i_size >>
1851                                 sb->s_blocksize_bits)
1852                         continue;
1853                 ret = udf_check_anchor_block(sb, last[i], fileset);
1854                 if (ret != -EAGAIN) {
1855                         if (!ret)
1856                                 *lastblock = last[i];
1857                         return ret;
1858                 }
1859                 if (last[i] < 256)
1860                         continue;
1861                 ret = udf_check_anchor_block(sb, last[i] - 256, fileset);
1862                 if (ret != -EAGAIN) {
1863                         if (!ret)
1864                                 *lastblock = last[i];
1865                         return ret;
1866                 }
1867         }
1868
1869         /* Finally try block 512 in case media is open */
1870         return udf_check_anchor_block(sb, sbi->s_session + 512, fileset);
1871 }
1872
1873 /*
1874  * Find an anchor volume descriptor and load Volume Descriptor Sequence from
1875  * area specified by it. The function expects sbi->s_lastblock to be the last
1876  * block on the media.
1877  *
1878  * Return <0 on error, 0 if anchor found. -EAGAIN is special meaning anchor
1879  * was not found.
1880  */
1881 static int udf_find_anchor(struct super_block *sb,
1882                            struct kernel_lb_addr *fileset)
1883 {
1884         struct udf_sb_info *sbi = UDF_SB(sb);
1885         sector_t lastblock = sbi->s_last_block;
1886         int ret;
1887
1888         ret = udf_scan_anchors(sb, &lastblock, fileset);
1889         if (ret != -EAGAIN)
1890                 goto out;
1891
1892         /* No anchor found? Try VARCONV conversion of block numbers */
1893         UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
1894         lastblock = udf_variable_to_fixed(sbi->s_last_block);
1895         /* Firstly, we try to not convert number of the last block */
1896         ret = udf_scan_anchors(sb, &lastblock, fileset);
1897         if (ret != -EAGAIN)
1898                 goto out;
1899
1900         lastblock = sbi->s_last_block;
1901         /* Secondly, we try with converted number of the last block */
1902         ret = udf_scan_anchors(sb, &lastblock, fileset);
1903         if (ret < 0) {
1904                 /* VARCONV didn't help. Clear it. */
1905                 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
1906         }
1907 out:
1908         if (ret == 0)
1909                 sbi->s_last_block = lastblock;
1910         return ret;
1911 }
1912
1913 /*
1914  * Check Volume Structure Descriptor, find Anchor block and load Volume
1915  * Descriptor Sequence.
1916  *
1917  * Returns < 0 on error, 0 on success. -EAGAIN is special meaning anchor
1918  * block was not found.
1919  */
1920 static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
1921                         int silent, struct kernel_lb_addr *fileset)
1922 {
1923         struct udf_sb_info *sbi = UDF_SB(sb);
1924         loff_t nsr_off;
1925         int ret;
1926
1927         if (!sb_set_blocksize(sb, uopt->blocksize)) {
1928                 if (!silent)
1929                         udf_warn(sb, "Bad block size\n");
1930                 return -EINVAL;
1931         }
1932         sbi->s_last_block = uopt->lastblock;
1933         if (!uopt->novrs) {
1934                 /* Check that it is NSR02 compliant */
1935                 nsr_off = udf_check_vsd(sb);
1936                 if (!nsr_off) {
1937                         if (!silent)
1938                                 udf_warn(sb, "No VRS found\n");
1939                         return 0;
1940                 }
1941                 if (nsr_off == -1)
1942                         udf_debug("Failed to read sector at offset %d. "
1943                                   "Assuming open disc. Skipping validity "
1944                                   "check\n", VSD_FIRST_SECTOR_OFFSET);
1945                 if (!sbi->s_last_block)
1946                         sbi->s_last_block = udf_get_last_block(sb);
1947         } else {
1948                 udf_debug("Validity check skipped because of novrs option\n");
1949         }
1950
1951         /* Look for anchor block and load Volume Descriptor Sequence */
1952         sbi->s_anchor = uopt->anchor;
1953         ret = udf_find_anchor(sb, fileset);
1954         if (ret < 0) {
1955                 if (!silent && ret == -EAGAIN)
1956                         udf_warn(sb, "No anchor found\n");
1957                 return ret;
1958         }
1959         return 0;
1960 }
1961
1962 static void udf_open_lvid(struct super_block *sb)
1963 {
1964         struct udf_sb_info *sbi = UDF_SB(sb);
1965         struct buffer_head *bh = sbi->s_lvid_bh;
1966         struct logicalVolIntegrityDesc *lvid;
1967         struct logicalVolIntegrityDescImpUse *lvidiu;
1968
1969         if (!bh)
1970                 return;
1971         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1972         lvidiu = udf_sb_lvidiu(sb);
1973         if (!lvidiu)
1974                 return;
1975
1976         mutex_lock(&sbi->s_alloc_mutex);
1977         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1978         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1979         udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
1980                                 CURRENT_TIME);
1981         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN);
1982
1983         lvid->descTag.descCRC = cpu_to_le16(
1984                 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1985                         le16_to_cpu(lvid->descTag.descCRCLength)));
1986
1987         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1988         mark_buffer_dirty(bh);
1989         sbi->s_lvid_dirty = 0;
1990         mutex_unlock(&sbi->s_alloc_mutex);
1991         /* Make opening of filesystem visible on the media immediately */
1992         sync_dirty_buffer(bh);
1993 }
1994
1995 static void udf_close_lvid(struct super_block *sb)
1996 {
1997         struct udf_sb_info *sbi = UDF_SB(sb);
1998         struct buffer_head *bh = sbi->s_lvid_bh;
1999         struct logicalVolIntegrityDesc *lvid;
2000         struct logicalVolIntegrityDescImpUse *lvidiu;
2001
2002         if (!bh)
2003                 return;
2004         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
2005         lvidiu = udf_sb_lvidiu(sb);
2006         if (!lvidiu)
2007                 return;
2008
2009         mutex_lock(&sbi->s_alloc_mutex);
2010         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
2011         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
2012         udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
2013         if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
2014                 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
2015         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
2016                 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
2017         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
2018                 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
2019         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
2020
2021         lvid->descTag.descCRC = cpu_to_le16(
2022                         crc_itu_t(0, (char *)lvid + sizeof(struct tag),
2023                                 le16_to_cpu(lvid->descTag.descCRCLength)));
2024
2025         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
2026         /*
2027          * We set buffer uptodate unconditionally here to avoid spurious
2028          * warnings from mark_buffer_dirty() when previous EIO has marked
2029          * the buffer as !uptodate
2030          */
2031         set_buffer_uptodate(bh);
2032         mark_buffer_dirty(bh);
2033         sbi->s_lvid_dirty = 0;
2034         mutex_unlock(&sbi->s_alloc_mutex);
2035         /* Make closing of filesystem visible on the media immediately */
2036         sync_dirty_buffer(bh);
2037 }
2038
2039 u64 lvid_get_unique_id(struct super_block *sb)
2040 {
2041         struct buffer_head *bh;
2042         struct udf_sb_info *sbi = UDF_SB(sb);
2043         struct logicalVolIntegrityDesc *lvid;
2044         struct logicalVolHeaderDesc *lvhd;
2045         u64 uniqueID;
2046         u64 ret;
2047
2048         bh = sbi->s_lvid_bh;
2049         if (!bh)
2050                 return 0;
2051
2052         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
2053         lvhd = (struct logicalVolHeaderDesc *)lvid->logicalVolContentsUse;
2054
2055         mutex_lock(&sbi->s_alloc_mutex);
2056         ret = uniqueID = le64_to_cpu(lvhd->uniqueID);
2057         if (!(++uniqueID & 0xFFFFFFFF))
2058                 uniqueID += 16;
2059         lvhd->uniqueID = cpu_to_le64(uniqueID);
2060         mutex_unlock(&sbi->s_alloc_mutex);
2061         mark_buffer_dirty(bh);
2062
2063         return ret;
2064 }
2065
2066 static int udf_fill_super(struct super_block *sb, void *options, int silent)
2067 {
2068         int ret = -EINVAL;
2069         struct inode *inode = NULL;
2070         struct udf_options uopt;
2071         struct kernel_lb_addr rootdir, fileset;
2072         struct udf_sb_info *sbi;
2073         bool lvid_open = false;
2074
2075         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
2076         uopt.uid = INVALID_UID;
2077         uopt.gid = INVALID_GID;
2078         uopt.umask = 0;
2079         uopt.fmode = UDF_INVALID_MODE;
2080         uopt.dmode = UDF_INVALID_MODE;
2081
2082         sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
2083         if (!sbi)
2084                 return -ENOMEM;
2085
2086         sb->s_fs_info = sbi;
2087
2088         mutex_init(&sbi->s_alloc_mutex);
2089
2090         if (!udf_parse_options((char *)options, &uopt, false))
2091                 goto parse_options_failure;
2092
2093         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
2094             uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
2095                 udf_err(sb, "utf8 cannot be combined with iocharset\n");
2096                 goto parse_options_failure;
2097         }
2098 #ifdef CONFIG_UDF_NLS
2099         if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
2100                 uopt.nls_map = load_nls_default();
2101                 if (!uopt.nls_map)
2102                         uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
2103                 else
2104                         udf_debug("Using default NLS map\n");
2105         }
2106 #endif
2107         if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
2108                 uopt.flags |= (1 << UDF_FLAG_UTF8);
2109
2110         fileset.logicalBlockNum = 0xFFFFFFFF;
2111         fileset.partitionReferenceNum = 0xFFFF;
2112
2113         sbi->s_flags = uopt.flags;
2114         sbi->s_uid = uopt.uid;
2115         sbi->s_gid = uopt.gid;
2116         sbi->s_umask = uopt.umask;
2117         sbi->s_fmode = uopt.fmode;
2118         sbi->s_dmode = uopt.dmode;
2119         sbi->s_nls_map = uopt.nls_map;
2120         rwlock_init(&sbi->s_cred_lock);
2121
2122         if (uopt.session == 0xFFFFFFFF)
2123                 sbi->s_session = udf_get_last_session(sb);
2124         else
2125                 sbi->s_session = uopt.session;
2126
2127         udf_debug("Multi-session=%d\n", sbi->s_session);
2128
2129         /* Fill in the rest of the superblock */
2130         sb->s_op = &udf_sb_ops;
2131         sb->s_export_op = &udf_export_ops;
2132
2133         sb->s_magic = UDF_SUPER_MAGIC;
2134         sb->s_time_gran = 1000;
2135
2136         if (uopt.flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) {
2137                 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
2138         } else {
2139                 uopt.blocksize = bdev_logical_block_size(sb->s_bdev);
2140                 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
2141                 if (ret == -EAGAIN && uopt.blocksize != UDF_DEFAULT_BLOCKSIZE) {
2142                         if (!silent)
2143                                 pr_notice("Rescanning with blocksize %d\n",
2144                                           UDF_DEFAULT_BLOCKSIZE);
2145                         brelse(sbi->s_lvid_bh);
2146                         sbi->s_lvid_bh = NULL;
2147                         uopt.blocksize = UDF_DEFAULT_BLOCKSIZE;
2148                         ret = udf_load_vrs(sb, &uopt, silent, &fileset);
2149                 }
2150         }
2151         if (ret < 0) {
2152                 if (ret == -EAGAIN) {
2153                         udf_warn(sb, "No partition found (1)\n");
2154                         ret = -EINVAL;
2155                 }
2156                 goto error_out;
2157         }
2158
2159         udf_debug("Lastblock=%d\n", sbi->s_last_block);
2160
2161         if (sbi->s_lvid_bh) {
2162                 struct logicalVolIntegrityDescImpUse *lvidiu =
2163                                                         udf_sb_lvidiu(sb);
2164                 uint16_t minUDFReadRev;
2165                 uint16_t minUDFWriteRev;
2166
2167                 if (!lvidiu) {
2168                         ret = -EINVAL;
2169                         goto error_out;
2170                 }
2171                 minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
2172                 minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
2173                 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
2174                         udf_err(sb, "minUDFReadRev=%x (max is %x)\n",
2175                                 minUDFReadRev,
2176                                 UDF_MAX_READ_VERSION);
2177                         ret = -EINVAL;
2178                         goto error_out;
2179                 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION &&
2180                            !(sb->s_flags & MS_RDONLY)) {
2181                         ret = -EACCES;
2182                         goto error_out;
2183                 }
2184
2185                 sbi->s_udfrev = minUDFWriteRev;
2186
2187                 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
2188                         UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
2189                 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
2190                         UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
2191         }
2192
2193         if (!sbi->s_partitions) {
2194                 udf_warn(sb, "No partition found (2)\n");
2195                 ret = -EINVAL;
2196                 goto error_out;
2197         }
2198
2199         if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
2200                         UDF_PART_FLAG_READ_ONLY &&
2201             !(sb->s_flags & MS_RDONLY)) {
2202                 ret = -EACCES;
2203                 goto error_out;
2204         }
2205
2206         if (udf_find_fileset(sb, &fileset, &rootdir)) {
2207                 udf_warn(sb, "No fileset found\n");
2208                 ret = -EINVAL;
2209                 goto error_out;
2210         }
2211
2212         if (!silent) {
2213                 struct timestamp ts;
2214                 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
2215                 udf_info("Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
2216                          sbi->s_volume_ident,
2217                          le16_to_cpu(ts.year), ts.month, ts.day,
2218                          ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
2219         }
2220         if (!(sb->s_flags & MS_RDONLY)) {
2221                 udf_open_lvid(sb);
2222                 lvid_open = true;
2223         }
2224
2225         /* Assign the root inode */
2226         /* assign inodes by physical block number */
2227         /* perhaps it's not extensible enough, but for now ... */
2228         inode = udf_iget(sb, &rootdir);
2229         if (IS_ERR(inode)) {
2230                 udf_err(sb, "Error in udf_iget, block=%d, partition=%d\n",
2231                        rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
2232                 ret = PTR_ERR(inode);
2233                 goto error_out;
2234         }
2235
2236         /* Allocate a dentry for the root inode */
2237         sb->s_root = d_make_root(inode);
2238         if (!sb->s_root) {
2239                 udf_err(sb, "Couldn't allocate root dentry\n");
2240                 ret = -ENOMEM;
2241                 goto error_out;
2242         }
2243         sb->s_maxbytes = MAX_LFS_FILESIZE;
2244         sb->s_max_links = UDF_MAX_LINKS;
2245         return 0;
2246
2247 error_out:
2248         iput(sbi->s_vat_inode);
2249 parse_options_failure:
2250 #ifdef CONFIG_UDF_NLS
2251         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2252                 unload_nls(sbi->s_nls_map);
2253 #endif
2254         if (lvid_open)
2255                 udf_close_lvid(sb);
2256         brelse(sbi->s_lvid_bh);
2257         udf_sb_free_partitions(sb);
2258         kfree(sbi);
2259         sb->s_fs_info = NULL;
2260
2261         return ret;
2262 }
2263
2264 void _udf_err(struct super_block *sb, const char *function,
2265               const char *fmt, ...)
2266 {
2267         struct va_format vaf;
2268         va_list args;
2269
2270         va_start(args, fmt);
2271
2272         vaf.fmt = fmt;
2273         vaf.va = &args;
2274
2275         pr_err("error (device %s): %s: %pV", sb->s_id, function, &vaf);
2276
2277         va_end(args);
2278 }
2279
2280 void _udf_warn(struct super_block *sb, const char *function,
2281                const char *fmt, ...)
2282 {
2283         struct va_format vaf;
2284         va_list args;
2285
2286         va_start(args, fmt);
2287
2288         vaf.fmt = fmt;
2289         vaf.va = &args;
2290
2291         pr_warn("warning (device %s): %s: %pV", sb->s_id, function, &vaf);
2292
2293         va_end(args);
2294 }
2295
2296 static void udf_put_super(struct super_block *sb)
2297 {
2298         struct udf_sb_info *sbi;
2299
2300         sbi = UDF_SB(sb);
2301
2302         iput(sbi->s_vat_inode);
2303 #ifdef CONFIG_UDF_NLS
2304         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2305                 unload_nls(sbi->s_nls_map);
2306 #endif
2307         if (!(sb->s_flags & MS_RDONLY))
2308                 udf_close_lvid(sb);
2309         brelse(sbi->s_lvid_bh);
2310         udf_sb_free_partitions(sb);
2311         mutex_destroy(&sbi->s_alloc_mutex);
2312         kfree(sb->s_fs_info);
2313         sb->s_fs_info = NULL;
2314 }
2315
2316 static int udf_sync_fs(struct super_block *sb, int wait)
2317 {
2318         struct udf_sb_info *sbi = UDF_SB(sb);
2319
2320         mutex_lock(&sbi->s_alloc_mutex);
2321         if (sbi->s_lvid_dirty) {
2322                 /*
2323                  * Blockdevice will be synced later so we don't have to submit
2324                  * the buffer for IO
2325                  */
2326                 mark_buffer_dirty(sbi->s_lvid_bh);
2327                 sbi->s_lvid_dirty = 0;
2328         }
2329         mutex_unlock(&sbi->s_alloc_mutex);
2330
2331         return 0;
2332 }
2333
2334 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
2335 {
2336         struct super_block *sb = dentry->d_sb;
2337         struct udf_sb_info *sbi = UDF_SB(sb);
2338         struct logicalVolIntegrityDescImpUse *lvidiu;
2339         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
2340
2341         lvidiu = udf_sb_lvidiu(sb);
2342         buf->f_type = UDF_SUPER_MAGIC;
2343         buf->f_bsize = sb->s_blocksize;
2344         buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
2345         buf->f_bfree = udf_count_free(sb);
2346         buf->f_bavail = buf->f_bfree;
2347         buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2348                                           le32_to_cpu(lvidiu->numDirs)) : 0)
2349                         + buf->f_bfree;
2350         buf->f_ffree = buf->f_bfree;
2351         buf->f_namelen = UDF_NAME_LEN - 2;
2352         buf->f_fsid.val[0] = (u32)id;
2353         buf->f_fsid.val[1] = (u32)(id >> 32);
2354
2355         return 0;
2356 }
2357
2358 static unsigned int udf_count_free_bitmap(struct super_block *sb,
2359                                           struct udf_bitmap *bitmap)
2360 {
2361         struct buffer_head *bh = NULL;
2362         unsigned int accum = 0;
2363         int index;
2364         int block = 0, newblock;
2365         struct kernel_lb_addr loc;
2366         uint32_t bytes;
2367         uint8_t *ptr;
2368         uint16_t ident;
2369         struct spaceBitmapDesc *bm;
2370
2371         loc.logicalBlockNum = bitmap->s_extPosition;
2372         loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
2373         bh = udf_read_ptagged(sb, &loc, 0, &ident);
2374
2375         if (!bh) {
2376                 udf_err(sb, "udf_count_free failed\n");
2377                 goto out;
2378         } else if (ident != TAG_IDENT_SBD) {
2379                 brelse(bh);
2380                 udf_err(sb, "udf_count_free failed\n");
2381                 goto out;
2382         }
2383
2384         bm = (struct spaceBitmapDesc *)bh->b_data;
2385         bytes = le32_to_cpu(bm->numOfBytes);
2386         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2387         ptr = (uint8_t *)bh->b_data;
2388
2389         while (bytes > 0) {
2390                 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2391                 accum += bitmap_weight((const unsigned long *)(ptr + index),
2392                                         cur_bytes * 8);
2393                 bytes -= cur_bytes;
2394                 if (bytes) {
2395                         brelse(bh);
2396                         newblock = udf_get_lb_pblock(sb, &loc, ++block);
2397                         bh = udf_tread(sb, newblock);
2398                         if (!bh) {
2399                                 udf_debug("read failed\n");
2400                                 goto out;
2401                         }
2402                         index = 0;
2403                         ptr = (uint8_t *)bh->b_data;
2404                 }
2405         }
2406         brelse(bh);
2407 out:
2408         return accum;
2409 }
2410
2411 static unsigned int udf_count_free_table(struct super_block *sb,
2412                                          struct inode *table)
2413 {
2414         unsigned int accum = 0;
2415         uint32_t elen;
2416         struct kernel_lb_addr eloc;
2417         int8_t etype;
2418         struct extent_position epos;
2419
2420         mutex_lock(&UDF_SB(sb)->s_alloc_mutex);
2421         epos.block = UDF_I(table)->i_location;
2422         epos.offset = sizeof(struct unallocSpaceEntry);
2423         epos.bh = NULL;
2424
2425         while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2426                 accum += (elen >> table->i_sb->s_blocksize_bits);
2427
2428         brelse(epos.bh);
2429         mutex_unlock(&UDF_SB(sb)->s_alloc_mutex);
2430
2431         return accum;
2432 }
2433
2434 static unsigned int udf_count_free(struct super_block *sb)
2435 {
2436         unsigned int accum = 0;
2437         struct udf_sb_info *sbi;
2438         struct udf_part_map *map;
2439
2440         sbi = UDF_SB(sb);
2441         if (sbi->s_lvid_bh) {
2442                 struct logicalVolIntegrityDesc *lvid =
2443                         (struct logicalVolIntegrityDesc *)
2444                         sbi->s_lvid_bh->b_data;
2445                 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
2446                         accum = le32_to_cpu(
2447                                         lvid->freeSpaceTable[sbi->s_partition]);
2448                         if (accum == 0xFFFFFFFF)
2449                                 accum = 0;
2450                 }
2451         }
2452
2453         if (accum)
2454                 return accum;
2455
2456         map = &sbi->s_partmaps[sbi->s_partition];
2457         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2458                 accum += udf_count_free_bitmap(sb,
2459                                                map->s_uspace.s_bitmap);
2460         }
2461         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
2462                 accum += udf_count_free_bitmap(sb,
2463                                                map->s_fspace.s_bitmap);
2464         }
2465         if (accum)
2466                 return accum;
2467
2468         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2469                 accum += udf_count_free_table(sb,
2470                                               map->s_uspace.s_table);
2471         }
2472         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
2473                 accum += udf_count_free_table(sb,
2474                                               map->s_fspace.s_table);
2475         }
2476
2477         return accum;
2478 }