fs/udf/super.c

   1 /*
   2  * super.c
   3  *
   4  * PURPOSE
   5  *  Super block routines for the OSTA-UDF(tm) filesystem.
   6  *
   7  * DESCRIPTION
   8  *  OSTA-UDF(tm) = Optical Storage Technology Association
   9  *  Universal Disk Format.
  10  *
  11  *  This code is based on version 2.00 of the UDF specification,
  12  *  and revision 3 of the ECMA 167 standard [equivalent to ISO 13346].
  13  *    http://www.osta.org/
  14  *    http://www.ecma.ch/
  15  *    http://www.iso.org/
  16  *
  17  * COPYRIGHT
  18  *  This file is distributed under the terms of the GNU General Public
  19  *  License (GPL). Copies of the GPL can be obtained from:
  20  *    ftp://prep.ai.mit.edu/pub/gnu/GPL
  21  *  Each contributing author retains all rights to their own work.
  22  *
  23  *  (C) 1998 Dave Boynton
  24  *  (C) 1998-2004 Ben Fennema
  25  *  (C) 2000 Stelias Computing Inc
  26  *
  27  * HISTORY
  28  *
  29  *  09/24/98 dgb  changed to allow compiling outside of kernel, and
  30  *                added some debugging.
  31  *  10/01/98 dgb  updated to allow (some) possibility of compiling w/2.0.34
  32  *  10/16/98      attempting some multi-session support
  33  *  10/17/98      added freespace count for "df"
  34  *  11/11/98 gr   added novrs option
  35  *  11/26/98 dgb  added fileset,anchor mount options
  36  *  12/06/98 blf  really hosed things royally. vat/sparing support. sequenced
  37  *                vol descs. rewrote option handling based on isofs
  38  *  12/20/98      find the free space bitmap (if it exists)
  39  */
  40
  41 #include "udfdecl.h"
  42
  43 #include <linux/blkdev.h>
  44 #include <linux/slab.h>
  45 #include <linux/kernel.h>
  46 #include <linux/module.h>
  47 #include <linux/parser.h>
  48 #include <linux/stat.h>
  49 #include <linux/cdrom.h>
  50 #include <linux/nls.h>
  51 #include <linux/buffer_head.h>
  52 #include <linux/vfs.h>
  53 #include <linux/vmalloc.h>
  54 #include <linux/errno.h>
  55 #include <linux/mount.h>
  56 #include <linux/seq_file.h>
  57 #include <linux/bitmap.h>
  58 #include <linux/crc-itu-t.h>
  59 #include <linux/log2.h>
  60 #include <asm/byteorder.h>
  61
  62 #include "udf_sb.h"
  63 #include "udf_i.h"
  64
  65 #include <linux/init.h>
  66 #include <asm/uaccess.h>
  67
  68 #define VDS_POS_PRIMARY_VOL_DESC        0
  69 #define VDS_POS_UNALLOC_SPACE_DESC      1
  70 #define VDS_POS_LOGICAL_VOL_DESC        2
  71 #define VDS_POS_PARTITION_DESC          3
  72 #define VDS_POS_IMP_USE_VOL_DESC        4
  73 #define VDS_POS_VOL_DESC_PTR            5
  74 #define VDS_POS_TERMINATING_DESC        6
  75 #define VDS_POS_LENGTH                  7
  76
  77 #define UDF_DEFAULT_BLOCKSIZE 2048
  78
  79 #define VSD_FIRST_SECTOR_OFFSET         32768
  80 #define VSD_MAX_SECTOR_OFFSET           0x800000
  81
  82 enum { UDF_MAX_LINKS = 0xffff };
  83
  84 /* These are the "meat" - everything else is stuffing */
  85 static int udf_fill_super(struct super_block *, void *, int);
  86 static void udf_put_super(struct super_block *);
  87 static int udf_sync_fs(struct super_block *, int);
  88 static int udf_remount_fs(struct super_block *, int *, char *);
  89 static void udf_load_logicalvolint(struct super_block *, struct kernel_extent_ad);
  90 static int udf_find_fileset(struct super_block *, struct kernel_lb_addr *,
  91                             struct kernel_lb_addr *);
  92 static void udf_load_fileset(struct super_block *, struct buffer_head *,
  93                              struct kernel_lb_addr *);
  94 static void udf_open_lvid(struct super_block *);
  95 static void udf_close_lvid(struct super_block *);
  96 static unsigned int udf_count_free(struct super_block *);
  97 static int udf_statfs(struct dentry *, struct kstatfs *);
  98 static int udf_show_options(struct seq_file *, struct dentry *);
  99
 100 struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct super_block *sb)
 101 {
 102         struct logicalVolIntegrityDesc *lvid;
 103         unsigned int partnum;
 104         unsigned int offset;
 105
 106         if (!UDF_SB(sb)->s_lvid_bh)
 107                 return NULL;
 108         lvid = (struct logicalVolIntegrityDesc *)UDF_SB(sb)->s_lvid_bh->b_data;
 109         partnum = le32_to_cpu(lvid->numOfPartitions);
 110         if ((sb->s_blocksize - sizeof(struct logicalVolIntegrityDescImpUse) -
 111              offsetof(struct logicalVolIntegrityDesc, impUse)) /
 112              (2 * sizeof(uint32_t)) < partnum) {
 113                 udf_err(sb, "Logical volume integrity descriptor corrupted "
 114                         "(numOfPartitions = %u)!\n", partnum);
 115                 return NULL;
 116         }
 117         /* The offset is to skip freeSpaceTable and sizeTable arrays */
 118         offset = partnum * 2 * sizeof(uint32_t);
 119         return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
 120 }
 121
 122 /* UDF filesystem type */
 123 static struct dentry *udf_mount(struct file_system_type *fs_type,
 124                       int flags, const char *dev_name, void *data)
 125 {
 126         return mount_bdev(fs_type, flags, dev_name, data, udf_fill_super);
 127 }
 128
 129 static struct file_system_type udf_fstype = {
 130         .owner          = THIS_MODULE,
 131         .name           = "udf",
 132         .mount          = udf_mount,
 133         .kill_sb        = kill_block_super,
 134         .fs_flags       = FS_REQUIRES_DEV,
 135 };
 136 MODULE_ALIAS_FS("udf");
 137
 138 static struct kmem_cache *udf_inode_cachep;
 139
 140 static struct inode *udf_alloc_inode(struct super_block *sb)
 141 {
 142         struct udf_inode_info *ei;
 143         ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
 144         if (!ei)
 145                 return NULL;
 146
 147         ei->i_unique = 0;
 148         ei->i_lenExtents = 0;
 149         ei->i_next_alloc_block = 0;
 150         ei->i_next_alloc_goal = 0;
 151         ei->i_strat4096 = 0;
 152         init_rwsem(&ei->i_data_sem);
 153         ei->cached_extent.lstart = -1;
 154         spin_lock_init(&ei->i_extent_cache_lock);
 155
 156         return &ei->vfs_inode;
 157 }
 158
 159 static void udf_i_callback(struct rcu_head *head)
 160 {
 161         struct inode *inode = container_of(head, struct inode, i_rcu);
 162         kmem_cache_free(udf_inode_cachep, UDF_I(inode));
 163 }
 164
 165 static void udf_destroy_inode(struct inode *inode)
 166 {
 167         call_rcu(&inode->i_rcu, udf_i_callback);
 168 }
 169
 170 static void init_once(void *foo)
 171 {
 172         struct udf_inode_info *ei = (struct udf_inode_info *)foo;
 173
 174         ei->i_ext.i_data = NULL;
 175         inode_init_once(&ei->vfs_inode);
 176 }
 177
 178 static int __init init_inodecache(void)
 179 {
 180         udf_inode_cachep = kmem_cache_create("udf_inode_cache",
 181                                              sizeof(struct udf_inode_info),
 182                                              0, (SLAB_RECLAIM_ACCOUNT |
 183                                                  SLAB_MEM_SPREAD),
 184                                              init_once);
 185         if (!udf_inode_cachep)
 186                 return -ENOMEM;
 187         return 0;
 188 }
 189
 190 static void destroy_inodecache(void)
 191 {
 192         /*
 193          * Make sure all delayed rcu free inodes are flushed before we
 194          * destroy cache.
 195          */
 196         rcu_barrier();
 197         kmem_cache_destroy(udf_inode_cachep);
 198 }
 199
 200 /* Superblock operations */
 201 static const struct super_operations udf_sb_ops = {
 202         .alloc_inode    = udf_alloc_inode,
 203         .destroy_inode  = udf_destroy_inode,
 204         .write_inode    = udf_write_inode,
 205         .evict_inode    = udf_evict_inode,
 206         .put_super      = udf_put_super,
 207         .sync_fs        = udf_sync_fs,
 208         .statfs         = udf_statfs,
 209         .remount_fs     = udf_remount_fs,
 210         .show_options   = udf_show_options,
 211 };
 212
 213 struct udf_options {
 214         unsigned char novrs;
 215         unsigned int blocksize;
 216         unsigned int session;
 217         unsigned int lastblock;
 218         unsigned int anchor;
 219         unsigned int volume;
 220         unsigned short partition;
 221         unsigned int fileset;
 222         unsigned int rootdir;
 223         unsigned int flags;
 224         umode_t umask;
 225         kgid_t gid;
 226         kuid_t uid;
 227         umode_t fmode;
 228         umode_t dmode;
 229         struct nls_table *nls_map;
 230 };
 231
 232 static int __init init_udf_fs(void)
 233 {
 234         int err;
 235
 236         err = init_inodecache();
 237         if (err)
 238                 goto out1;
 239         err = register_filesystem(&udf_fstype);
 240         if (err)
 241                 goto out;
 242
 243         return 0;
 244
 245 out:
 246         destroy_inodecache();
 247
 248 out1:
 249         return err;
 250 }
 251
 252 static void __exit exit_udf_fs(void)
 253 {
 254         unregister_filesystem(&udf_fstype);
 255         destroy_inodecache();
 256 }
 257
 258 module_init(init_udf_fs)
 259 module_exit(exit_udf_fs)
 260
 261 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
 262 {
 263         struct udf_sb_info *sbi = UDF_SB(sb);
 264
 265         sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map),
 266                                   GFP_KERNEL);
 267         if (!sbi->s_partmaps) {
 268                 udf_err(sb, "Unable to allocate space for %d partition maps\n",
 269                         count);
 270                 sbi->s_partitions = 0;
 271                 return -ENOMEM;
 272         }
 273
 274         sbi->s_partitions = count;
 275         return 0;
 276 }
 277
 278 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
 279 {
 280         int i;
 281         int nr_groups = bitmap->s_nr_groups;
 282         int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
 283                                                 nr_groups);
 284
 285         for (i = 0; i < nr_groups; i++)
 286                 if (bitmap->s_block_bitmap[i])
 287                         brelse(bitmap->s_block_bitmap[i]);
 288
 289         if (size <= PAGE_SIZE)
 290                 kfree(bitmap);
 291         else
 292                 vfree(bitmap);
 293 }
 294
 295 static void udf_free_partition(struct udf_part_map *map)
 296 {
 297         int i;
 298         struct udf_meta_data *mdata;
 299
 300         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
 301                 iput(map->s_uspace.s_table);
 302         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
 303                 iput(map->s_fspace.s_table);
 304         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
 305                 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
 306         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
 307                 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
 308         if (map->s_partition_type == UDF_SPARABLE_MAP15)
 309                 for (i = 0; i < 4; i++)
 310                         brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
 311         else if (map->s_partition_type == UDF_METADATA_MAP25) {
 312                 mdata = &map->s_type_specific.s_metadata;
 313                 iput(mdata->s_metadata_fe);
 314                 mdata->s_metadata_fe = NULL;
 315
 316                 iput(mdata->s_mirror_fe);
 317                 mdata->s_mirror_fe = NULL;
 318
 319                 iput(mdata->s_bitmap_fe);
 320                 mdata->s_bitmap_fe = NULL;
 321         }
 322 }
 323
 324 static void udf_sb_free_partitions(struct super_block *sb)
 325 {
 326         struct udf_sb_info *sbi = UDF_SB(sb);
 327         int i;
 328         if (sbi->s_partmaps == NULL)
 329                 return;
 330         for (i = 0; i < sbi->s_partitions; i++)
 331                 udf_free_partition(&sbi->s_partmaps[i]);
 332         kfree(sbi->s_partmaps);
 333         sbi->s_partmaps = NULL;
 334 }
 335
 336 static int udf_show_options(struct seq_file *seq, struct dentry *root)
 337 {
 338         struct super_block *sb = root->d_sb;
 339         struct udf_sb_info *sbi = UDF_SB(sb);
 340
 341         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
 342                 seq_puts(seq, ",nostrict");
 343         if (UDF_QUERY_FLAG(sb, UDF_FLAG_BLOCKSIZE_SET))
 344                 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
 345         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
 346                 seq_puts(seq, ",unhide");
 347         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
 348                 seq_puts(seq, ",undelete");
 349         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
 350                 seq_puts(seq, ",noadinicb");
 351         if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
 352                 seq_puts(seq, ",shortad");
 353         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
 354                 seq_puts(seq, ",uid=forget");
 355         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_IGNORE))
 356                 seq_puts(seq, ",uid=ignore");
 357         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
 358                 seq_puts(seq, ",gid=forget");
 359         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE))
 360                 seq_puts(seq, ",gid=ignore");
 361         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
 362                 seq_printf(seq, ",uid=%u", from_kuid(&init_user_ns, sbi->s_uid));
 363         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
 364                 seq_printf(seq, ",gid=%u", from_kgid(&init_user_ns, sbi->s_gid));
 365         if (sbi->s_umask != 0)
 366                 seq_printf(seq, ",umask=%ho", sbi->s_umask);
 367         if (sbi->s_fmode != UDF_INVALID_MODE)
 368                 seq_printf(seq, ",mode=%ho", sbi->s_fmode);
 369         if (sbi->s_dmode != UDF_INVALID_MODE)
 370                 seq_printf(seq, ",dmode=%ho", sbi->s_dmode);
 371         if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
 372                 seq_printf(seq, ",session=%u", sbi->s_session);
 373         if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
 374                 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
 375         if (sbi->s_anchor != 0)
 376                 seq_printf(seq, ",anchor=%u", sbi->s_anchor);
 377         /*
 378          * volume, partition, fileset and rootdir seem to be ignored
 379          * currently
 380          */
 381         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
 382                 seq_puts(seq, ",utf8");
 383         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
 384                 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
 385
 386         return 0;
 387 }
 388
 389 /*
 390  * udf_parse_options
 391  *
 392  * PURPOSE
 393  *      Parse mount options.
 394  *
 395  * DESCRIPTION
 396  *      The following mount options are supported:
 397  *
 398  *      gid=            Set the default group.
 399  *      umask=          Set the default umask.
 400  *      mode=           Set the default file permissions.
 401  *      dmode=          Set the default directory permissions.
 402  *      uid=            Set the default user.
 403  *      bs=             Set the block size.
 404  *      unhide          Show otherwise hidden files.
 405  *      undelete        Show deleted files in lists.
 406  *      adinicb         Embed data in the inode (default)
 407  *      noadinicb       Don't embed data in the inode
 408  *      shortad         Use short ad's
 409  *      longad          Use long ad's (default)
 410  *      nostrict        Unset strict conformance
 411  *      iocharset=      Set the NLS character set
 412  *
 413  *      The remaining are for debugging and disaster recovery:
 414  *
 415  *      novrs           Skip volume sequence recognition
 416  *
 417  *      The following expect a offset from 0.
 418  *
 419  *      session=        Set the CDROM session (default= last session)
 420  *      anchor=         Override standard anchor location. (default= 256)
 421  *      volume=         Override the VolumeDesc location. (unused)
 422  *      partition=      Override the PartitionDesc location. (unused)
 423  *      lastblock=      Set the last block of the filesystem/
 424  *
 425  *      The following expect a offset from the partition root.
 426  *
 427  *      fileset=        Override the fileset block location. (unused)
 428  *      rootdir=        Override the root directory location. (unused)
 429  *              WARNING: overriding the rootdir to a non-directory may
 430  *              yield highly unpredictable results.
 431  *
 432  * PRE-CONDITIONS
 433  *      options         Pointer to mount options string.
 434  *      uopts           Pointer to mount options variable.
 435  *
 436  * POST-CONDITIONS
 437  *      <return>        1       Mount options parsed okay.
 438  *      <return>        0       Error parsing mount options.
 439  *
 440  * HISTORY
 441  *      July 1, 1997 - Andrew E. Mileski
 442  *      Written, tested, and released.
 443  */
 444
 445 enum {
 446         Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
 447         Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
 448         Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
 449         Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
 450         Opt_rootdir, Opt_utf8, Opt_iocharset,
 451         Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore,
 452         Opt_fmode, Opt_dmode
 453 };
 454
 455 static const match_table_t tokens = {
 456         {Opt_novrs,     "novrs"},
 457         {Opt_nostrict,  "nostrict"},
 458         {Opt_bs,        "bs=%u"},
 459         {Opt_unhide,    "unhide"},
 460         {Opt_undelete,  "undelete"},
 461         {Opt_noadinicb, "noadinicb"},
 462         {Opt_adinicb,   "adinicb"},
 463         {Opt_shortad,   "shortad"},
 464         {Opt_longad,    "longad"},
 465         {Opt_uforget,   "uid=forget"},
 466         {Opt_uignore,   "uid=ignore"},
 467         {Opt_gforget,   "gid=forget"},
 468         {Opt_gignore,   "gid=ignore"},
 469         {Opt_gid,       "gid=%u"},
 470         {Opt_uid,       "uid=%u"},
 471         {Opt_umask,     "umask=%o"},
 472         {Opt_session,   "session=%u"},
 473         {Opt_lastblock, "lastblock=%u"},
 474         {Opt_anchor,    "anchor=%u"},
 475         {Opt_volume,    "volume=%u"},
 476         {Opt_partition, "partition=%u"},
 477         {Opt_fileset,   "fileset=%u"},
 478         {Opt_rootdir,   "rootdir=%u"},
 479         {Opt_utf8,      "utf8"},
 480         {Opt_iocharset, "iocharset=%s"},
 481         {Opt_fmode,     "mode=%o"},
 482         {Opt_dmode,     "dmode=%o"},
 483         {Opt_err,       NULL}
 484 };
 485
 486 static int udf_parse_options(char *options, struct udf_options *uopt,
 487                              bool remount)
 488 {
 489         char *p;
 490         int option;
 491
 492         uopt->novrs = 0;
 493         uopt->partition = 0xFFFF;
 494         uopt->session = 0xFFFFFFFF;
 495         uopt->lastblock = 0;
 496         uopt->anchor = 0;
 497         uopt->volume = 0xFFFFFFFF;
 498         uopt->rootdir = 0xFFFFFFFF;
 499         uopt->fileset = 0xFFFFFFFF;
 500         uopt->nls_map = NULL;
 501
 502         if (!options)
 503                 return 1;
 504
 505         while ((p = strsep(&options, ",")) != NULL) {
 506                 substring_t args[MAX_OPT_ARGS];
 507                 int token;
 508                 unsigned n;
 509                 if (!*p)
 510                         continue;
 511
 512                 token = match_token(p, tokens, args);
 513                 switch (token) {
 514                 case Opt_novrs:
 515                         uopt->novrs = 1;
 516                         break;
 517                 case Opt_bs:
 518                         if (match_int(&args[0], &option))
 519                                 return 0;
 520                         n = option;
 521                         if (n != 512 && n != 1024 && n != 2048 && n != 4096)
 522                                 return 0;
 523                         uopt->blocksize = n;
 524                         uopt->flags |= (1 << UDF_FLAG_BLOCKSIZE_SET);
 525                         break;
 526                 case Opt_unhide:
 527                         uopt->flags |= (1 << UDF_FLAG_UNHIDE);
 528                         break;
 529                 case Opt_undelete:
 530                         uopt->flags |= (1 << UDF_FLAG_UNDELETE);
 531                         break;
 532                 case Opt_noadinicb:
 533                         uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
 534                         break;
 535                 case Opt_adinicb:
 536                         uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
 537                         break;
 538                 case Opt_shortad:
 539                         uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
 540                         break;
 541                 case Opt_longad:
 542                         uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
 543                         break;
 544                 case Opt_gid:
 545                         if (match_int(args, &option))
 546                                 return 0;
 547                         uopt->gid = make_kgid(current_user_ns(), option);
 548                         if (!gid_valid(uopt->gid))
 549                                 return 0;
 550                         uopt->flags |= (1 << UDF_FLAG_GID_SET);
 551                         break;
 552                 case Opt_uid:
 553                         if (match_int(args, &option))
 554                                 return 0;
 555                         uopt->uid = make_kuid(current_user_ns(), option);
 556                         if (!uid_valid(uopt->uid))
 557                                 return 0;
 558                         uopt->flags |= (1 << UDF_FLAG_UID_SET);
 559                         break;
 560                 case Opt_umask:
 561                         if (match_octal(args, &option))
 562                                 return 0;
 563                         uopt->umask = option;
 564                         break;
 565                 case Opt_nostrict:
 566                         uopt->flags &= ~(1 << UDF_FLAG_STRICT);
 567                         break;
 568                 case Opt_session:
 569                         if (match_int(args, &option))
 570                                 return 0;
 571                         uopt->session = option;
 572                         if (!remount)
 573                                 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
 574                         break;
 575                 case Opt_lastblock:
 576                         if (match_int(args, &option))
 577                                 return 0;
 578                         uopt->lastblock = option;
 579                         if (!remount)
 580                                 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
 581                         break;
 582                 case Opt_anchor:
 583                         if (match_int(args, &option))
 584                                 return 0;
 585                         uopt->anchor = option;
 586                         break;
 587                 case Opt_volume:
 588                         if (match_int(args, &option))
 589                                 return 0;
 590                         uopt->volume = option;
 591                         break;
 592                 case Opt_partition:
 593                         if (match_int(args, &option))
 594                                 return 0;
 595                         uopt->partition = option;
 596                         break;
 597                 case Opt_fileset:
 598                         if (match_int(args, &option))
 599                                 return 0;
 600                         uopt->fileset = option;
 601                         break;
 602                 case Opt_rootdir:
 603                         if (match_int(args, &option))
 604                                 return 0;
 605                         uopt->rootdir = option;
 606                         break;
 607                 case Opt_utf8:
 608                         uopt->flags |= (1 << UDF_FLAG_UTF8);
 609                         break;
 610 #ifdef CONFIG_UDF_NLS
 611                 case Opt_iocharset:
 612                         uopt->nls_map = load_nls(args[0].from);
 613                         uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
 614                         break;
 615 #endif
 616                 case Opt_uignore:
 617                         uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
 618                         break;
 619                 case Opt_uforget:
 620                         uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
 621                         break;
 622                 case Opt_gignore:
 623                         uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
 624                         break;
 625                 case Opt_gforget:
 626                         uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
 627                         break;
 628                 case Opt_fmode:
 629                         if (match_octal(args, &option))
 630                                 return 0;
 631                         uopt->fmode = option & 0777;
 632                         break;
 633                 case Opt_dmode:
 634                         if (match_octal(args, &option))
 635                                 return 0;
 636                         uopt->dmode = option & 0777;
 637                         break;
 638                 default:
 639                         pr_err("bad mount option \"%s\" or missing value\n", p);
 640                         return 0;
 641                 }
 642         }
 643         return 1;
 644 }
 645
 646 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
 647 {
 648         struct udf_options uopt;
 649         struct udf_sb_info *sbi = UDF_SB(sb);
 650         int error = 0;
 651         struct logicalVolIntegrityDescImpUse *lvidiu = udf_sb_lvidiu(sb);
 652
 653         sync_filesystem(sb);
 654         if (lvidiu) {
 655                 int write_rev = le16_to_cpu(lvidiu->minUDFWriteRev);
 656                 if (write_rev > UDF_MAX_WRITE_VERSION && !(*flags & MS_RDONLY))
 657                         return -EACCES;
 658         }
 659
 660         uopt.flags = sbi->s_flags;
 661         uopt.uid   = sbi->s_uid;
 662         uopt.gid   = sbi->s_gid;
 663         uopt.umask = sbi->s_umask;
 664         uopt.fmode = sbi->s_fmode;
 665         uopt.dmode = sbi->s_dmode;
 666
 667         if (!udf_parse_options(options, &uopt, true))
 668                 return -EINVAL;
 669
 670         write_lock(&sbi->s_cred_lock);
 671         sbi->s_flags = uopt.flags;
 672         sbi->s_uid   = uopt.uid;
 673         sbi->s_gid   = uopt.gid;
 674         sbi->s_umask = uopt.umask;
 675         sbi->s_fmode = uopt.fmode;
 676         sbi->s_dmode = uopt.dmode;
 677         write_unlock(&sbi->s_cred_lock);
 678
 679         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 680                 goto out_unlock;
 681
 682         if (*flags & MS_RDONLY)
 683                 udf_close_lvid(sb);
 684         else
 685                 udf_open_lvid(sb);
 686
 687 out_unlock:
 688         return error;
 689 }
 690
 691 /* Check Volume Structure Descriptors (ECMA 167 2/9.1) */
 692 /* We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
 693 static loff_t udf_check_vsd(struct super_block *sb)
 694 {
 695         struct volStructDesc *vsd = NULL;
 696         loff_t sector = VSD_FIRST_SECTOR_OFFSET;
 697         int sectorsize;
 698         struct buffer_head *bh = NULL;
 699         int nsr02 = 0;
 700         int nsr03 = 0;
 701         struct udf_sb_info *sbi;
 702
 703         sbi = UDF_SB(sb);
 704         if (sb->s_blocksize < sizeof(struct volStructDesc))
 705                 sectorsize = sizeof(struct volStructDesc);
 706         else
 707                 sectorsize = sb->s_blocksize;
 708
 709         sector += (sbi->s_session << sb->s_blocksize_bits);
 710
 711         udf_debug("Starting at sector %u (%ld byte sectors)\n",
 712                   (unsigned int)(sector >> sb->s_blocksize_bits),
 713                   sb->s_blocksize);
 714         /* Process the sequence (if applicable). The hard limit on the sector
 715          * offset is arbitrary, hopefully large enough so that all valid UDF
 716          * filesystems will be recognised. There is no mention of an upper
 717          * bound to the size of the volume recognition area in the standard.
 718          *  The limit will prevent the code to read all the sectors of a
 719          * specially crafted image (like a bluray disc full of CD001 sectors),
 720          * potentially causing minutes or even hours of uninterruptible I/O
 721          * activity. This actually happened with uninitialised SSD partitions
 722          * (all 0xFF) before the check for the limit and all valid IDs were
 723          * added */
 724         for (; !nsr02 && !nsr03 && sector < VSD_MAX_SECTOR_OFFSET;
 725              sector += sectorsize) {
 726                 /* Read a block */
 727                 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
 728                 if (!bh)
 729                         break;
 730
 731                 /* Look for ISO  descriptors */
 732                 vsd = (struct volStructDesc *)(bh->b_data +
 733                                               (sector & (sb->s_blocksize - 1)));
 734
 735                 if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
 736                                     VSD_STD_ID_LEN)) {
 737                         switch (vsd->structType) {
 738                         case 0:
 739                                 udf_debug("ISO9660 Boot Record found\n");
 740                                 break;
 741                         case 1:
 742                                 udf_debug("ISO9660 Primary Volume Descriptor found\n");
 743                                 break;
 744                         case 2:
 745                                 udf_debug("ISO9660 Supplementary Volume Descriptor found\n");
 746                                 break;
 747                         case 3:
 748                                 udf_debug("ISO9660 Volume Partition Descriptor found\n");
 749                                 break;
 750                         case 255:
 751                                 udf_debug("ISO9660 Volume Descriptor Set Terminator found\n");
 752                                 break;
 753                         default:
 754                                 udf_debug("ISO9660 VRS (%u) found\n",
 755                                           vsd->structType);
 756                                 break;
 757                         }
 758                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
 759                                     VSD_STD_ID_LEN))
 760                         ; /* nothing */
 761                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
 762                                     VSD_STD_ID_LEN)) {
 763                         brelse(bh);
 764                         break;
 765                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
 766                                     VSD_STD_ID_LEN))
 767                         nsr02 = sector;
 768                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
 769                                     VSD_STD_ID_LEN))
 770                         nsr03 = sector;
 771                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BOOT2,
 772                                     VSD_STD_ID_LEN))
 773                         ; /* nothing */
 774                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CDW02,
 775                                     VSD_STD_ID_LEN))
 776                         ; /* nothing */
 777                 else {
 778                         /* invalid id : end of volume recognition area */
 779                         brelse(bh);
 780                         break;
 781                 }
 782                 brelse(bh);
 783         }
 784
 785         if (nsr03)
 786                 return nsr03;
 787         else if (nsr02)
 788                 return nsr02;
 789         else if (!bh && sector - (sbi->s_session << sb->s_blocksize_bits) ==
 790                         VSD_FIRST_SECTOR_OFFSET)
 791                 return -1;
 792         else
 793                 return 0;
 794 }
 795
 796 static int udf_find_fileset(struct super_block *sb,
 797                             struct kernel_lb_addr *fileset,
 798                             struct kernel_lb_addr *root)
 799 {
 800         struct buffer_head *bh = NULL;
 801         long lastblock;
 802         uint16_t ident;
 803         struct udf_sb_info *sbi;
 804
 805         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
 806             fileset->partitionReferenceNum != 0xFFFF) {
 807                 bh = udf_read_ptagged(sb, fileset, 0, &ident);
 808
 809                 if (!bh) {
 810                         return 1;
 811                 } else if (ident != TAG_IDENT_FSD) {
 812                         brelse(bh);
 813                         return 1;
 814                 }
 815
 816         }
 817
 818         sbi = UDF_SB(sb);
 819         if (!bh) {
 820                 /* Search backwards through the partitions */
 821                 struct kernel_lb_addr newfileset;
 822
 823 /* --> cvg: FIXME - is it reasonable? */
 824                 return 1;
 825
 826                 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
 827                      (newfileset.partitionReferenceNum != 0xFFFF &&
 828                       fileset->logicalBlockNum == 0xFFFFFFFF &&
 829                       fileset->partitionReferenceNum == 0xFFFF);
 830                      newfileset.partitionReferenceNum--) {
 831                         lastblock = sbi->s_partmaps
 832                                         [newfileset.partitionReferenceNum]
 833                                                 .s_partition_len;
 834                         newfileset.logicalBlockNum = 0;
 835
 836                         do {
 837                                 bh = udf_read_ptagged(sb, &newfileset, 0,
 838                                                       &ident);
 839                                 if (!bh) {
 840                                         newfileset.logicalBlockNum++;
 841                                         continue;
 842                                 }
 843
 844                                 switch (ident) {
 845                                 case TAG_IDENT_SBD:
 846                                 {
 847                                         struct spaceBitmapDesc *sp;
 848                                         sp = (struct spaceBitmapDesc *)
 849                                                                 bh->b_data;
 850                                         newfileset.logicalBlockNum += 1 +
 851                                                 ((le32_to_cpu(sp->numOfBytes) +
 852                                                   sizeof(struct spaceBitmapDesc)
 853                                                   - 1) >> sb->s_blocksize_bits);
 854                                         brelse(bh);
 855                                         break;
 856                                 }
 857                                 case TAG_IDENT_FSD:
 858                                         *fileset = newfileset;
 859                                         break;
 860                                 default:
 861                                         newfileset.logicalBlockNum++;
 862                                         brelse(bh);
 863                                         bh = NULL;
 864                                         break;
 865                                 }
 866                         } while (newfileset.logicalBlockNum < lastblock &&
 867                                  fileset->logicalBlockNum == 0xFFFFFFFF &&
 868                                  fileset->partitionReferenceNum == 0xFFFF);
 869                 }
 870         }
 871
 872         if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
 873              fileset->partitionReferenceNum != 0xFFFF) && bh) {
 874                 udf_debug("Fileset at block=%d, partition=%d\n",
 875                           fileset->logicalBlockNum,
 876                           fileset->partitionReferenceNum);
 877
 878                 sbi->s_partition = fileset->partitionReferenceNum;
 879                 udf_load_fileset(sb, bh, root);
 880                 brelse(bh);
 881                 return 0;
 882         }
 883         return 1;
 884 }
 885
 886 /*
 887  * Load primary Volume Descriptor Sequence
 888  *
 889  * Return <0 on error, 0 on success. -EAGAIN is special meaning next sequence
 890  * should be tried.
 891  */
 892 static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
 893 {
 894         struct primaryVolDesc *pvoldesc;
 895         struct ustr *instr, *outstr;
 896         struct buffer_head *bh;
 897         uint16_t ident;
 898         int ret = -ENOMEM;
 899
 900         instr = kmalloc(sizeof(struct ustr), GFP_NOFS);
 901         if (!instr)
 902                 return -ENOMEM;
 903
 904         outstr = kmalloc(sizeof(struct ustr), GFP_NOFS);
 905         if (!outstr)
 906                 goto out1;
 907
 908         bh = udf_read_tagged(sb, block, block, &ident);
 909         if (!bh) {
 910                 ret = -EAGAIN;
 911                 goto out2;
 912         }
 913
 914         if (ident != TAG_IDENT_PVD) {
 915                 ret = -EIO;
 916                 goto out_bh;
 917         }
 918
 919         pvoldesc = (struct primaryVolDesc *)bh->b_data;
 920
 921         if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
 922                               pvoldesc->recordingDateAndTime)) {
 923 #ifdef UDFFS_DEBUG
 924                 struct timestamp *ts = &pvoldesc->recordingDateAndTime;
 925                 udf_debug("recording time %04u/%02u/%02u %02u:%02u (%x)\n",
 926                           le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
 927                           ts->minute, le16_to_cpu(ts->typeAndTimezone));
 928 #endif
 929         }
 930
 931         if (!udf_build_ustr(instr, pvoldesc->volIdent, 32))
 932                 if (udf_CS0toUTF8(outstr, instr)) {
 933                         strncpy(UDF_SB(sb)->s_volume_ident, outstr->u_name,
 934                                 outstr->u_len > 31 ? 31 : outstr->u_len);
 935                         udf_debug("volIdent[] = '%s'\n",
 936                                   UDF_SB(sb)->s_volume_ident);
 937                 }
 938
 939         if (!udf_build_ustr(instr, pvoldesc->volSetIdent, 128))
 940                 if (udf_CS0toUTF8(outstr, instr))
 941                         udf_debug("volSetIdent[] = '%s'\n", outstr->u_name);
 942
 943         ret = 0;
 944 out_bh:
 945         brelse(bh);
 946 out2:
 947         kfree(outstr);
 948 out1:
 949         kfree(instr);
 950         return ret;
 951 }
 952
 953 struct inode *udf_find_metadata_inode_efe(struct super_block *sb,
 954                                         u32 meta_file_loc, u32 partition_num)
 955 {
 956         struct kernel_lb_addr addr;
 957         struct inode *metadata_fe;
 958
 959         addr.logicalBlockNum = meta_file_loc;
 960         addr.partitionReferenceNum = partition_num;
 961
 962         metadata_fe = udf_iget(sb, &addr);
 963
 964         if (metadata_fe == NULL)
 965                 udf_warn(sb, "metadata inode efe not found\n");
 966         else if (UDF_I(metadata_fe)->i_alloc_type != ICBTAG_FLAG_AD_SHORT) {
 967                 udf_warn(sb, "metadata inode efe does not have short allocation descriptors!\n");
 968                 iput(metadata_fe);
 969                 metadata_fe = NULL;
 970         }
 971
 972         return metadata_fe;
 973 }
 974
 975 static int udf_load_metadata_files(struct super_block *sb, int partition)
 976 {
 977         struct udf_sb_info *sbi = UDF_SB(sb);
 978         struct udf_part_map *map;
 979         struct udf_meta_data *mdata;
 980         struct kernel_lb_addr addr;
 981
 982         map = &sbi->s_partmaps[partition];
 983         mdata = &map->s_type_specific.s_metadata;
 984
 985         /* metadata address */
 986         udf_debug("Metadata file location: block = %d part = %d\n",
 987                   mdata->s_meta_file_loc, map->s_partition_num);
 988
 989         mdata->s_metadata_fe = udf_find_metadata_inode_efe(sb,
 990                 mdata->s_meta_file_loc, map->s_partition_num);
 991
 992         if (mdata->s_metadata_fe == NULL) {
 993                 /* mirror file entry */
 994                 udf_debug("Mirror metadata file location: block = %d part = %d\n",
 995                           mdata->s_mirror_file_loc, map->s_partition_num);
 996
 997                 mdata->s_mirror_fe = udf_find_metadata_inode_efe(sb,
 998                         mdata->s_mirror_file_loc, map->s_partition_num);
 999
1000                 if (mdata->s_mirror_fe == NULL) {
1001                         udf_err(sb, "Both metadata and mirror metadata inode efe can not found\n");
1002                         return -EIO;
1003                 }
1004         }
1005
1006         /*
1007          * bitmap file entry
1008          * Note:
1009          * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
1010         */
1011         if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
1012                 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
1013                 addr.partitionReferenceNum = map->s_partition_num;
1014
1015                 udf_debug("Bitmap file location: block = %d part = %d\n",
1016                           addr.logicalBlockNum, addr.partitionReferenceNum);
1017
1018                 mdata->s_bitmap_fe = udf_iget(sb, &addr);
1019                 if (mdata->s_bitmap_fe == NULL) {
1020                         if (sb->s_flags & MS_RDONLY)
1021                                 udf_warn(sb, "bitmap inode efe not found but it's ok since the disc is mounted read-only\n");
1022                         else {
1023                                 udf_err(sb, "bitmap inode efe not found and attempted read-write mount\n");
1024                                 return -EIO;
1025                         }
1026                 }
1027         }
1028
1029         udf_debug("udf_load_metadata_files Ok\n");
1030         return 0;
1031 }
1032
1033 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
1034                              struct kernel_lb_addr *root)
1035 {
1036         struct fileSetDesc *fset;
1037
1038         fset = (struct fileSetDesc *)bh->b_data;
1039
1040         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
1041
1042         UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
1043
1044         udf_debug("Rootdir at block=%d, partition=%d\n",
1045                   root->logicalBlockNum, root->partitionReferenceNum);
1046 }
1047
1048 int udf_compute_nr_groups(struct super_block *sb, u32 partition)
1049 {
1050         struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
1051         return DIV_ROUND_UP(map->s_partition_len +
1052                             (sizeof(struct spaceBitmapDesc) << 3),
1053                             sb->s_blocksize * 8);
1054 }
1055
1056 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
1057 {
1058         struct udf_bitmap *bitmap;
1059         int nr_groups;
1060         int size;
1061
1062         nr_groups = udf_compute_nr_groups(sb, index);
1063         size = sizeof(struct udf_bitmap) +
1064                 (sizeof(struct buffer_head *) * nr_groups);
1065
1066         if (size <= PAGE_SIZE)
1067                 bitmap = kzalloc(size, GFP_KERNEL);
1068         else
1069                 bitmap = vzalloc(size); /* TODO: get rid of vzalloc */
1070
1071         if (bitmap == NULL)
1072                 return NULL;
1073
1074         bitmap->s_nr_groups = nr_groups;
1075         return bitmap;
1076 }
1077
1078 static int udf_fill_partdesc_info(struct super_block *sb,
1079                 struct partitionDesc *p, int p_index)
1080 {
1081         struct udf_part_map *map;
1082         struct udf_sb_info *sbi = UDF_SB(sb);
1083         struct partitionHeaderDesc *phd;
1084
1085         map = &sbi->s_partmaps[p_index];
1086
1087         map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
1088         map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
1089
1090         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
1091                 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
1092         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
1093                 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
1094         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
1095                 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
1096         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
1097                 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
1098
1099         udf_debug("Partition (%d type %x) starts at physical %d, block length %d\n",
1100                   p_index, map->s_partition_type,
1101                   map->s_partition_root, map->s_partition_len);
1102
1103         if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1104             strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
1105                 return 0;
1106
1107         phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1108         if (phd->unallocSpaceTable.extLength) {
1109                 struct kernel_lb_addr loc = {
1110                         .logicalBlockNum = le32_to_cpu(
1111                                 phd->unallocSpaceTable.extPosition),
1112                         .partitionReferenceNum = p_index,
1113                 };
1114
1115                 map->s_uspace.s_table = udf_iget(sb, &loc);
1116                 if (!map->s_uspace.s_table) {
1117                         udf_debug("cannot load unallocSpaceTable (part %d)\n",
1118                                   p_index);
1119                         return -EIO;
1120                 }
1121                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1122                 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
1123                           p_index, map->s_uspace.s_table->i_ino);
1124         }
1125
1126         if (phd->unallocSpaceBitmap.extLength) {
1127                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1128                 if (!bitmap)
1129                         return -ENOMEM;
1130                 map->s_uspace.s_bitmap = bitmap;
1131                 bitmap->s_extPosition = le32_to_cpu(
1132                                 phd->unallocSpaceBitmap.extPosition);
1133                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1134                 udf_debug("unallocSpaceBitmap (part %d) @ %d\n",
1135                           p_index, bitmap->s_extPosition);
1136         }
1137
1138         if (phd->partitionIntegrityTable.extLength)
1139                 udf_debug("partitionIntegrityTable (part %d)\n", p_index);
1140
1141         if (phd->freedSpaceTable.extLength) {
1142                 struct kernel_lb_addr loc = {
1143                         .logicalBlockNum = le32_to_cpu(
1144                                 phd->freedSpaceTable.extPosition),
1145                         .partitionReferenceNum = p_index,
1146                 };
1147
1148                 map->s_fspace.s_table = udf_iget(sb, &loc);
1149                 if (!map->s_fspace.s_table) {
1150                         udf_debug("cannot load freedSpaceTable (part %d)\n",
1151                                   p_index);
1152                         return -EIO;
1153                 }
1154
1155                 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
1156                 udf_debug("freedSpaceTable (part %d) @ %ld\n",
1157                           p_index, map->s_fspace.s_table->i_ino);
1158         }
1159
1160         if (phd->freedSpaceBitmap.extLength) {
1161                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1162                 if (!bitmap)
1163                         return -ENOMEM;
1164                 map->s_fspace.s_bitmap = bitmap;
1165                 bitmap->s_extPosition = le32_to_cpu(
1166                                 phd->freedSpaceBitmap.extPosition);
1167                 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1168                 udf_debug("freedSpaceBitmap (part %d) @ %d\n",
1169                           p_index, bitmap->s_extPosition);
1170         }
1171         return 0;
1172 }
1173
1174 static void udf_find_vat_block(struct super_block *sb, int p_index,
1175                                int type1_index, sector_t start_block)
1176 {
1177         struct udf_sb_info *sbi = UDF_SB(sb);
1178         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1179         sector_t vat_block;
1180         struct kernel_lb_addr ino;
1181
1182         /*
1183          * VAT file entry is in the last recorded block. Some broken disks have
1184          * it a few blocks before so try a bit harder...
1185          */
1186         ino.partitionReferenceNum = type1_index;
1187         for (vat_block = start_block;
1188              vat_block >= map->s_partition_root &&
1189              vat_block >= start_block - 3 &&
1190              !sbi->s_vat_inode; vat_block--) {
1191                 ino.logicalBlockNum = vat_block - map->s_partition_root;
1192                 sbi->s_vat_inode = udf_iget(sb, &ino);
1193         }
1194 }
1195
1196 static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1197 {
1198         struct udf_sb_info *sbi = UDF_SB(sb);
1199         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1200         struct buffer_head *bh = NULL;
1201         struct udf_inode_info *vati;
1202         uint32_t pos;
1203         struct virtualAllocationTable20 *vat20;
1204         sector_t blocks = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
1205
1206         udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block);
1207         if (!sbi->s_vat_inode &&
1208             sbi->s_last_block != blocks - 1) {
1209                 pr_notice("Failed to read VAT inode from the last recorded block (%lu), retrying with the last block of the device (%lu).\n",
1210                           (unsigned long)sbi->s_last_block,
1211                           (unsigned long)blocks - 1);
1212                 udf_find_vat_block(sb, p_index, type1_index, blocks - 1);
1213         }
1214         if (!sbi->s_vat_inode)
1215                 return -EIO;
1216
1217         if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1218                 map->s_type_specific.s_virtual.s_start_offset = 0;
1219                 map->s_type_specific.s_virtual.s_num_entries =
1220                         (sbi->s_vat_inode->i_size - 36) >> 2;
1221         } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1222                 vati = UDF_I(sbi->s_vat_inode);
1223                 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1224                         pos = udf_block_map(sbi->s_vat_inode, 0);
1225                         bh = sb_bread(sb, pos);
1226                         if (!bh)
1227                                 return -EIO;
1228                         vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1229                 } else {
1230                         vat20 = (struct virtualAllocationTable20 *)
1231                                                         vati->i_ext.i_data;
1232                 }
1233
1234                 map->s_type_specific.s_virtual.s_start_offset =
1235                         le16_to_cpu(vat20->lengthHeader);
1236                 map->s_type_specific.s_virtual.s_num_entries =
1237                         (sbi->s_vat_inode->i_size -
1238                                 map->s_type_specific.s_virtual.
1239                                         s_start_offset) >> 2;
1240                 brelse(bh);
1241         }
1242         return 0;
1243 }
1244
1245 /*
1246  * Load partition descriptor block
1247  *
1248  * Returns <0 on error, 0 on success, -EAGAIN is special - try next descriptor
1249  * sequence.
1250  */
1251 static int udf_load_partdesc(struct super_block *sb, sector_t block)
1252 {
1253         struct buffer_head *bh;
1254         struct partitionDesc *p;
1255         struct udf_part_map *map;
1256         struct udf_sb_info *sbi = UDF_SB(sb);
1257         int i, type1_idx;
1258         uint16_t partitionNumber;
1259         uint16_t ident;
1260         int ret;
1261
1262         bh = udf_read_tagged(sb, block, block, &ident);
1263         if (!bh)
1264                 return -EAGAIN;
1265         if (ident != TAG_IDENT_PD) {
1266                 ret = 0;
1267                 goto out_bh;
1268         }
1269
1270         p = (struct partitionDesc *)bh->b_data;
1271         partitionNumber = le16_to_cpu(p->partitionNumber);
1272
1273         /* First scan for TYPE1, SPARABLE and METADATA partitions */
1274         for (i = 0; i < sbi->s_partitions; i++) {
1275                 map = &sbi->s_partmaps[i];
1276                 udf_debug("Searching map: (%d == %d)\n",
1277                           map->s_partition_num, partitionNumber);
1278                 if (map->s_partition_num == partitionNumber &&
1279                     (map->s_partition_type == UDF_TYPE1_MAP15 ||
1280                      map->s_partition_type == UDF_SPARABLE_MAP15))
1281                         break;
1282         }
1283
1284         if (i >= sbi->s_partitions) {
1285                 udf_debug("Partition (%d) not found in partition map\n",
1286                           partitionNumber);
1287                 ret = 0;
1288                 goto out_bh;
1289         }
1290
1291         ret = udf_fill_partdesc_info(sb, p, i);
1292         if (ret < 0)
1293                 goto out_bh;
1294
1295         /*
1296          * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1297          * PHYSICAL partitions are already set up
1298          */
1299         type1_idx = i;
1300 #ifdef UDFFS_DEBUG
1301         map = NULL; /* supress 'maybe used uninitialized' warning */
1302 #endif
1303         for (i = 0; i < sbi->s_partitions; i++) {
1304                 map = &sbi->s_partmaps[i];
1305
1306                 if (map->s_partition_num == partitionNumber &&
1307                     (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1308                      map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1309                      map->s_partition_type == UDF_METADATA_MAP25))
1310                         break;
1311         }
1312
1313         if (i >= sbi->s_partitions) {
1314                 ret = 0;
1315                 goto out_bh;
1316         }
1317
1318         ret = udf_fill_partdesc_info(sb, p, i);
1319         if (ret < 0)
1320                 goto out_bh;
1321
1322         if (map->s_partition_type == UDF_METADATA_MAP25) {
1323                 ret = udf_load_metadata_files(sb, i);
1324                 if (ret < 0) {
1325                         udf_err(sb, "error loading MetaData partition map %d\n",
1326                                 i);
1327                         goto out_bh;
1328                 }
1329         } else {
1330                 /*
1331                  * If we have a partition with virtual map, we don't handle
1332                  * writing to it (we overwrite blocks instead of relocating
1333                  * them).
1334                  */
1335                 if (!(sb->s_flags & MS_RDONLY)) {
1336                         ret = -EACCES;
1337                         goto out_bh;
1338                 }
1339                 ret = udf_load_vat(sb, i, type1_idx);
1340                 if (ret < 0)
1341                         goto out_bh;
1342         }
1343         ret = 0;
1344 out_bh:
1345         /* In case loading failed, we handle cleanup in udf_fill_super */
1346         brelse(bh);
1347         return ret;
1348 }
1349
1350 static int udf_load_sparable_map(struct super_block *sb,
1351                                  struct udf_part_map *map,
1352                                  struct sparablePartitionMap *spm)
1353 {
1354         uint32_t loc;
1355         uint16_t ident;
1356         struct sparingTable *st;
1357         struct udf_sparing_data *sdata = &map->s_type_specific.s_sparing;
1358         int i;
1359         struct buffer_head *bh;
1360
1361         map->s_partition_type = UDF_SPARABLE_MAP15;
1362         sdata->s_packet_len = le16_to_cpu(spm->packetLength);
1363         if (!is_power_of_2(sdata->s_packet_len)) {
1364                 udf_err(sb, "error loading logical volume descriptor: "
1365                         "Invalid packet length %u\n",
1366                         (unsigned)sdata->s_packet_len);
1367                 return -EIO;
1368         }
1369         if (spm->numSparingTables > 4) {
1370                 udf_err(sb, "error loading logical volume descriptor: "
1371                         "Too many sparing tables (%d)\n",
1372                         (int)spm->numSparingTables);
1373                 return -EIO;
1374         }
1375
1376         for (i = 0; i < spm->numSparingTables; i++) {
1377                 loc = le32_to_cpu(spm->locSparingTable[i]);
1378                 bh = udf_read_tagged(sb, loc, loc, &ident);
1379                 if (!bh)
1380                         continue;
1381
1382                 st = (struct sparingTable *)bh->b_data;
1383                 if (ident != 0 ||
1384                     strncmp(st->sparingIdent.ident, UDF_ID_SPARING,
1385                             strlen(UDF_ID_SPARING)) ||
1386                     sizeof(*st) + le16_to_cpu(st->reallocationTableLen) >
1387                                                         sb->s_blocksize) {
1388                         brelse(bh);
1389                         continue;
1390                 }
1391
1392                 sdata->s_spar_map[i] = bh;
1393         }
1394         map->s_partition_func = udf_get_pblock_spar15;
1395         return 0;
1396 }
1397
1398 static int udf_load_logicalvol(struct super_block *sb, sector_t block,
1399                                struct kernel_lb_addr *fileset)
1400 {
1401         struct logicalVolDesc *lvd;
1402         int i, offset;
1403         uint8_t type;
1404         struct udf_sb_info *sbi = UDF_SB(sb);
1405         struct genericPartitionMap *gpm;
1406         uint16_t ident;
1407         struct buffer_head *bh;
1408         unsigned int table_len;
1409         int ret;
1410
1411         bh = udf_read_tagged(sb, block, block, &ident);
1412         if (!bh)
1413                 return -EAGAIN;
1414         BUG_ON(ident != TAG_IDENT_LVD);
1415         lvd = (struct logicalVolDesc *)bh->b_data;
1416         table_len = le32_to_cpu(lvd->mapTableLength);
1417         if (table_len > sb->s_blocksize - sizeof(*lvd)) {
1418                 udf_err(sb, "error loading logical volume descriptor: "
1419                         "Partition table too long (%u > %lu)\n", table_len,
1420                         sb->s_blocksize - sizeof(*lvd));
1421                 ret = -EIO;
1422                 goto out_bh;
1423         }
1424
1425         ret = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1426         if (ret)
1427                 goto out_bh;
1428
1429         for (i = 0, offset = 0;
1430              i < sbi->s_partitions && offset < table_len;
1431              i++, offset += gpm->partitionMapLength) {
1432                 struct udf_part_map *map = &sbi->s_partmaps[i];
1433                 gpm = (struct genericPartitionMap *)
1434                                 &(lvd->partitionMaps[offset]);
1435                 type = gpm->partitionMapType;
1436                 if (type == 1) {
1437                         struct genericPartitionMap1 *gpm1 =
1438                                 (struct genericPartitionMap1 *)gpm;
1439                         map->s_partition_type = UDF_TYPE1_MAP15;
1440                         map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1441                         map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1442                         map->s_partition_func = NULL;
1443                 } else if (type == 2) {
1444                         struct udfPartitionMap2 *upm2 =
1445                                                 (struct udfPartitionMap2 *)gpm;
1446                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1447                                                 strlen(UDF_ID_VIRTUAL))) {
1448                                 u16 suf =
1449                                         le16_to_cpu(((__le16 *)upm2->partIdent.
1450                                                         identSuffix)[0]);
1451                                 if (suf < 0x0200) {
1452                                         map->s_partition_type =
1453                                                         UDF_VIRTUAL_MAP15;
1454                                         map->s_partition_func =
1455                                                         udf_get_pblock_virt15;
1456                                 } else {
1457                                         map->s_partition_type =
1458                                                         UDF_VIRTUAL_MAP20;
1459                                         map->s_partition_func =
1460                                                         udf_get_pblock_virt20;
1461                                 }
1462                         } else if (!strncmp(upm2->partIdent.ident,
1463                                                 UDF_ID_SPARABLE,
1464                                                 strlen(UDF_ID_SPARABLE))) {
1465                                 ret = udf_load_sparable_map(sb, map,
1466                                         (struct sparablePartitionMap *)gpm);
1467                                 if (ret < 0)
1468                                         goto out_bh;
1469                         } else if (!strncmp(upm2->partIdent.ident,
1470                                                 UDF_ID_METADATA,
1471                                                 strlen(UDF_ID_METADATA))) {
1472                                 struct udf_meta_data *mdata =
1473                                         &map->s_type_specific.s_metadata;
1474                                 struct metadataPartitionMap *mdm =
1475                                                 (struct metadataPartitionMap *)
1476                                                 &(lvd->partitionMaps[offset]);
1477                                 udf_debug("Parsing Logical vol part %d type %d  id=%s\n",
1478                                           i, type, UDF_ID_METADATA);
1479
1480                                 map->s_partition_type = UDF_METADATA_MAP25;
1481                                 map->s_partition_func = udf_get_pblock_meta25;
1482
1483                                 mdata->s_meta_file_loc   =
1484                                         le32_to_cpu(mdm->metadataFileLoc);
1485                                 mdata->s_mirror_file_loc =
1486                                         le32_to_cpu(mdm->metadataMirrorFileLoc);
1487                                 mdata->s_bitmap_file_loc =
1488                                         le32_to_cpu(mdm->metadataBitmapFileLoc);
1489                                 mdata->s_alloc_unit_size =
1490                                         le32_to_cpu(mdm->allocUnitSize);
1491                                 mdata->s_align_unit_size =
1492                                         le16_to_cpu(mdm->alignUnitSize);
1493                                 if (mdm->flags & 0x01)
1494                                         mdata->s_flags |= MF_DUPLICATE_MD;
1495
1496                                 udf_debug("Metadata Ident suffix=0x%x\n",
1497                                           le16_to_cpu(*(__le16 *)
1498                                                       mdm->partIdent.identSuffix));
1499                                 udf_debug("Metadata part num=%d\n",
1500                                           le16_to_cpu(mdm->partitionNum));
1501                                 udf_debug("Metadata part alloc unit size=%d\n",
1502                                           le32_to_cpu(mdm->allocUnitSize));
1503                                 udf_debug("Metadata file loc=%d\n",
1504                                           le32_to_cpu(mdm->metadataFileLoc));
1505                                 udf_debug("Mirror file loc=%d\n",
1506                                           le32_to_cpu(mdm->metadataMirrorFileLoc));
1507                                 udf_debug("Bitmap file loc=%d\n",
1508                                           le32_to_cpu(mdm->metadataBitmapFileLoc));
1509                                 udf_debug("Flags: %d %d\n",
1510                                           mdata->s_flags, mdm->flags);
1511                         } else {
1512                                 udf_debug("Unknown ident: %s\n",
1513                                           upm2->partIdent.ident);
1514                                 continue;
1515                         }
1516                         map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1517                         map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1518                 }
1519                 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1520                           i, map->s_partition_num, type, map->s_volumeseqnum);
1521         }
1522
1523         if (fileset) {
1524                 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
1525
1526                 *fileset = lelb_to_cpu(la->extLocation);
1527                 udf_debug("FileSet found in LogicalVolDesc at block=%d, partition=%d\n",
1528                           fileset->logicalBlockNum,
1529                           fileset->partitionReferenceNum);
1530         }
1531         if (lvd->integritySeqExt.extLength)
1532                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1533         ret = 0;
1534 out_bh:
1535         brelse(bh);
1536         return ret;
1537 }
1538
1539 /*
1540  * udf_load_logicalvolint
1541  *
1542  */
1543 static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
1544 {
1545         struct buffer_head *bh = NULL;
1546         uint16_t ident;
1547         struct udf_sb_info *sbi = UDF_SB(sb);
1548         struct logicalVolIntegrityDesc *lvid;
1549
1550         while (loc.extLength > 0 &&
1551                (bh = udf_read_tagged(sb, loc.extLocation,
1552                                      loc.extLocation, &ident)) &&
1553                ident == TAG_IDENT_LVID) {
1554                 sbi->s_lvid_bh = bh;
1555                 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1556
1557                 if (lvid->nextIntegrityExt.extLength)
1558                         udf_load_logicalvolint(sb,
1559                                 leea_to_cpu(lvid->nextIntegrityExt));
1560
1561                 if (sbi->s_lvid_bh != bh)
1562                         brelse(bh);
1563                 loc.extLength -= sb->s_blocksize;
1564                 loc.extLocation++;
1565         }
1566         if (sbi->s_lvid_bh != bh)
1567                 brelse(bh);
1568 }
1569
1570 /*
1571  * Process a main/reserve volume descriptor sequence.
1572  *   @block             First block of first extent of the sequence.
1573  *   @lastblock         Lastblock of first extent of the sequence.
1574  *   @fileset           There we store extent containing root fileset
1575  *
1576  * Returns <0 on error, 0 on success. -EAGAIN is special - try next descriptor
1577  * sequence
1578  */
1579 static noinline int udf_process_sequence(
1580                 struct super_block *sb,
1581                 sector_t block, sector_t lastblock,
1582                 struct kernel_lb_addr *fileset)
1583 {
1584         struct buffer_head *bh = NULL;
1585         struct udf_vds_record vds[VDS_POS_LENGTH];
1586         struct udf_vds_record *curr;
1587         struct generic_desc *gd;
1588         struct volDescPtr *vdp;
1589         int done = 0;
1590         uint32_t vdsn;
1591         uint16_t ident;
1592         long next_s = 0, next_e = 0;
1593         int ret;
1594
1595         memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1596
1597         /*
1598          * Read the main descriptor sequence and find which descriptors
1599          * are in it.
1600          */
1601         for (; (!done && block <= lastblock); block++) {
1602
1603                 bh = udf_read_tagged(sb, block, block, &ident);
1604                 if (!bh) {
1605                         udf_err(sb,
1606                                 "Block %llu of volume descriptor sequence is corrupted or we could not read it\n",
1607                                 (unsigned long long)block);
1608                         return -EAGAIN;
1609                 }
1610
1611                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1612                 gd = (struct generic_desc *)bh->b_data;
1613                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1614                 switch (ident) {
1615                 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1616                         curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1617                         if (vdsn >= curr->volDescSeqNum) {
1618                                 curr->volDescSeqNum = vdsn;
1619                                 curr->block = block;
1620                         }
1621                         break;
1622                 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1623                         curr = &vds[VDS_POS_VOL_DESC_PTR];
1624                         if (vdsn >= curr->volDescSeqNum) {
1625                                 curr->volDescSeqNum = vdsn;
1626                                 curr->block = block;
1627
1628                                 vdp = (struct volDescPtr *)bh->b_data;
1629                                 next_s = le32_to_cpu(
1630                                         vdp->nextVolDescSeqExt.extLocation);
1631                                 next_e = le32_to_cpu(
1632                                         vdp->nextVolDescSeqExt.extLength);
1633                                 next_e = next_e >> sb->s_blocksize_bits;
1634                                 next_e += next_s;
1635                         }
1636                         break;
1637                 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1638                         curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1639                         if (vdsn >= curr->volDescSeqNum) {
1640                                 curr->volDescSeqNum = vdsn;
1641                                 curr->block = block;
1642                         }
1643                         break;
1644                 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1645                         curr = &vds[VDS_POS_PARTITION_DESC];
1646                         if (!curr->block)
1647                                 curr->block = block;
1648                         break;
1649                 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1650                         curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1651                         if (vdsn >= curr->volDescSeqNum) {
1652                                 curr->volDescSeqNum = vdsn;
1653                                 curr->block = block;
1654                         }
1655                         break;
1656                 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1657                         curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1658                         if (vdsn >= curr->volDescSeqNum) {
1659                                 curr->volDescSeqNum = vdsn;
1660                                 curr->block = block;
1661                         }
1662                         break;
1663                 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1664                         vds[VDS_POS_TERMINATING_DESC].block = block;
1665                         if (next_e) {
1666                                 block = next_s;
1667                                 lastblock = next_e;
1668                                 next_s = next_e = 0;
1669                         } else
1670                                 done = 1;
1671                         break;
1672                 }
1673                 brelse(bh);
1674         }
1675         /*
1676          * Now read interesting descriptors again and process them
1677          * in a suitable order
1678          */
1679         if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1680                 udf_err(sb, "Primary Volume Descriptor not found!\n");
1681                 return -EAGAIN;
1682         }
1683         ret = udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block);
1684         if (ret < 0)
1685                 return ret;
1686
1687         if (vds[VDS_POS_LOGICAL_VOL_DESC].block) {
1688                 ret = udf_load_logicalvol(sb,
1689                                           vds[VDS_POS_LOGICAL_VOL_DESC].block,
1690                                           fileset);
1691                 if (ret < 0)
1692                         return ret;
1693         }
1694
1695         if (vds[VDS_POS_PARTITION_DESC].block) {
1696                 /*
1697                  * We rescan the whole descriptor sequence to find
1698                  * partition descriptor blocks and process them.
1699                  */
1700                 for (block = vds[VDS_POS_PARTITION_DESC].block;
1701                      block < vds[VDS_POS_TERMINATING_DESC].block;
1702                      block++) {
1703                         ret = udf_load_partdesc(sb, block);
1704                         if (ret < 0)
1705                                 return ret;
1706                 }
1707         }
1708
1709         return 0;
1710 }
1711
1712 /*
1713  * Load Volume Descriptor Sequence described by anchor in bh
1714  *
1715  * Returns <0 on error, 0 on success
1716  */
1717 static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh,
1718                              struct kernel_lb_addr *fileset)
1719 {
1720         struct anchorVolDescPtr *anchor;
1721         sector_t main_s, main_e, reserve_s, reserve_e;
1722         int ret;
1723
1724         anchor = (struct anchorVolDescPtr *)bh->b_data;
1725
1726         /* Locate the main sequence */
1727         main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1728         main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1729         main_e = main_e >> sb->s_blocksize_bits;
1730         main_e += main_s;
1731
1732         /* Locate the reserve sequence */
1733         reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1734         reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1735         reserve_e = reserve_e >> sb->s_blocksize_bits;
1736         reserve_e += reserve_s;
1737
1738         /* Process the main & reserve sequences */
1739         /* responsible for finding the PartitionDesc(s) */
1740         ret = udf_process_sequence(sb, main_s, main_e, fileset);
1741         if (ret != -EAGAIN)
1742                 return ret;
1743         udf_sb_free_partitions(sb);
1744         ret = udf_process_sequence(sb, reserve_s, reserve_e, fileset);
1745         if (ret < 0) {
1746                 udf_sb_free_partitions(sb);
1747                 /* No sequence was OK, return -EIO */
1748                 if (ret == -EAGAIN)
1749                         ret = -EIO;
1750         }
1751         return ret;
1752 }
1753
1754 /*
1755  * Check whether there is an anchor block in the given block and
1756  * load Volume Descriptor Sequence if so.
1757  *
1758  * Returns <0 on error, 0 on success, -EAGAIN is special - try next anchor
1759  * block
1760  */
1761 static int udf_check_anchor_block(struct super_block *sb, sector_t block,
1762                                   struct kernel_lb_addr *fileset)
1763 {
1764         struct buffer_head *bh;
1765         uint16_t ident;
1766         int ret;
1767
1768         if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
1769             udf_fixed_to_variable(block) >=
1770             sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits)
1771                 return -EAGAIN;
1772
1773         bh = udf_read_tagged(sb, block, block, &ident);
1774         if (!bh)
1775                 return -EAGAIN;
1776         if (ident != TAG_IDENT_AVDP) {
1777                 brelse(bh);
1778                 return -EAGAIN;
1779         }
1780         ret = udf_load_sequence(sb, bh, fileset);
1781         brelse(bh);
1782         return ret;
1783 }
1784
1785 /*
1786  * Search for an anchor volume descriptor pointer.
1787  *
1788  * Returns < 0 on error, 0 on success. -EAGAIN is special - try next set
1789  * of anchors.
1790  */
1791 static int udf_scan_anchors(struct super_block *sb, sector_t *lastblock,
1792                             struct kernel_lb_addr *fileset)
1793 {
1794         sector_t last[6];
1795         int i;
1796         struct udf_sb_info *sbi = UDF_SB(sb);
1797         int last_count = 0;
1798         int ret;
1799
1800         /* First try user provided anchor */
1801         if (sbi->s_anchor) {
1802                 ret = udf_check_anchor_block(sb, sbi->s_anchor, fileset);
1803                 if (ret != -EAGAIN)
1804                         return ret;
1805         }
1806         /*
1807          * according to spec, anchor is in either:
1808          *     block 256
1809          *     lastblock-256
1810          *     lastblock
1811          *  however, if the disc isn't closed, it could be 512.
1812          */
1813         ret = udf_check_anchor_block(sb, sbi->s_session + 256, fileset);
1814         if (ret != -EAGAIN)
1815                 return ret;
1816         /*
1817          * The trouble is which block is the last one. Drives often misreport
1818          * this so we try various possibilities.
1819          */
1820         last[last_count++] = *lastblock;
1821         if (*lastblock >= 1)
1822                 last[last_count++] = *lastblock - 1;
1823         last[last_count++] = *lastblock + 1;
1824         if (*lastblock >= 2)
1825                 last[last_count++] = *lastblock - 2;
1826         if (*lastblock >= 150)
1827                 last[last_count++] = *lastblock - 150;
1828         if (*lastblock >= 152)
1829                 last[last_count++] = *lastblock - 152;
1830
1831         for (i = 0; i < last_count; i++) {
1832                 if (last[i] >= sb->s_bdev->bd_inode->i_size >>
1833                                 sb->s_blocksize_bits)
1834                         continue;
1835                 ret = udf_check_anchor_block(sb, last[i], fileset);
1836                 if (ret != -EAGAIN) {
1837                         if (!ret)
1838                                 *lastblock = last[i];
1839                         return ret;
1840                 }
1841                 if (last[i] < 256)
1842                         continue;
1843                 ret = udf_check_anchor_block(sb, last[i] - 256, fileset);
1844                 if (ret != -EAGAIN) {
1845                         if (!ret)
1846                                 *lastblock = last[i];
1847                         return ret;
1848                 }
1849         }
1850
1851         /* Finally try block 512 in case media is open */
1852         return udf_check_anchor_block(sb, sbi->s_session + 512, fileset);
1853 }
1854
1855 /*
1856  * Find an anchor volume descriptor and load Volume Descriptor Sequence from
1857  * area specified by it. The function expects sbi->s_lastblock to be the last
1858  * block on the media.
1859  *
1860  * Return <0 on error, 0 if anchor found. -EAGAIN is special meaning anchor
1861  * was not found.
1862  */
1863 static int udf_find_anchor(struct super_block *sb,
1864                            struct kernel_lb_addr *fileset)
1865 {
1866         struct udf_sb_info *sbi = UDF_SB(sb);
1867         sector_t lastblock = sbi->s_last_block;
1868         int ret;
1869
1870         ret = udf_scan_anchors(sb, &lastblock, fileset);
1871         if (ret != -EAGAIN)
1872                 goto out;
1873
1874         /* No anchor found? Try VARCONV conversion of block numbers */
1875         UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
1876         lastblock = udf_variable_to_fixed(sbi->s_last_block);
1877         /* Firstly, we try to not convert number of the last block */
1878         ret = udf_scan_anchors(sb, &lastblock, fileset);
1879         if (ret != -EAGAIN)
1880                 goto out;
1881
1882         lastblock = sbi->s_last_block;
1883         /* Secondly, we try with converted number of the last block */
1884         ret = udf_scan_anchors(sb, &lastblock, fileset);
1885         if (ret < 0) {
1886                 /* VARCONV didn't help. Clear it. */
1887                 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
1888         }
1889 out:
1890         if (ret == 0)
1891                 sbi->s_last_block = lastblock;
1892         return ret;
1893 }
1894
1895 /*
1896  * Check Volume Structure Descriptor, find Anchor block and load Volume
1897  * Descriptor Sequence.
1898  *
1899  * Returns < 0 on error, 0 on success. -EAGAIN is special meaning anchor
1900  * block was not found.
1901  */
1902 static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
1903                         int silent, struct kernel_lb_addr *fileset)
1904 {
1905         struct udf_sb_info *sbi = UDF_SB(sb);
1906         loff_t nsr_off;
1907         int ret;
1908
1909         if (!sb_set_blocksize(sb, uopt->blocksize)) {
1910                 if (!silent)
1911                         udf_warn(sb, "Bad block size\n");
1912                 return -EINVAL;
1913         }
1914         sbi->s_last_block = uopt->lastblock;
1915         if (!uopt->novrs) {
1916                 /* Check that it is NSR02 compliant */
1917                 nsr_off = udf_check_vsd(sb);
1918                 if (!nsr_off) {
1919                         if (!silent)
1920                                 udf_warn(sb, "No VRS found\n");
1921                         return 0;
1922                 }
1923                 if (nsr_off == -1)
1924                         udf_debug("Failed to read sector at offset %d. "
1925                                   "Assuming open disc. Skipping validity "
1926                                   "check\n", VSD_FIRST_SECTOR_OFFSET);
1927                 if (!sbi->s_last_block)
1928                         sbi->s_last_block = udf_get_last_block(sb);
1929         } else {
1930                 udf_debug("Validity check skipped because of novrs option\n");
1931         }
1932
1933         /* Look for anchor block and load Volume Descriptor Sequence */
1934         sbi->s_anchor = uopt->anchor;
1935         ret = udf_find_anchor(sb, fileset);
1936         if (ret < 0) {
1937                 if (!silent && ret == -EAGAIN)
1938                         udf_warn(sb, "No anchor found\n");
1939                 return ret;
1940         }
1941         return 0;
1942 }
1943
1944 static void udf_open_lvid(struct super_block *sb)
1945 {
1946         struct udf_sb_info *sbi = UDF_SB(sb);
1947         struct buffer_head *bh = sbi->s_lvid_bh;
1948         struct logicalVolIntegrityDesc *lvid;
1949         struct logicalVolIntegrityDescImpUse *lvidiu;
1950
1951         if (!bh)
1952                 return;
1953         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1954         lvidiu = udf_sb_lvidiu(sb);
1955         if (!lvidiu)
1956                 return;
1957
1958         mutex_lock(&sbi->s_alloc_mutex);
1959         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1960         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1961         udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
1962                                 CURRENT_TIME);
1963         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN);
1964
1965         lvid->descTag.descCRC = cpu_to_le16(
1966                 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1967                         le16_to_cpu(lvid->descTag.descCRCLength)));
1968
1969         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1970         mark_buffer_dirty(bh);
1971         sbi->s_lvid_dirty = 0;
1972         mutex_unlock(&sbi->s_alloc_mutex);
1973         /* Make opening of filesystem visible on the media immediately */
1974         sync_dirty_buffer(bh);
1975 }
1976
1977 static void udf_close_lvid(struct super_block *sb)
1978 {
1979         struct udf_sb_info *sbi = UDF_SB(sb);
1980         struct buffer_head *bh = sbi->s_lvid_bh;
1981         struct logicalVolIntegrityDesc *lvid;
1982         struct logicalVolIntegrityDescImpUse *lvidiu;
1983
1984         if (!bh)
1985                 return;
1986         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1987         lvidiu = udf_sb_lvidiu(sb);
1988         if (!lvidiu)
1989                 return;
1990
1991         mutex_lock(&sbi->s_alloc_mutex);
1992         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1993         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1994         udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
1995         if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1996                 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1997         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1998                 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1999         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
2000                 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
2001         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
2002
2003         lvid->descTag.descCRC = cpu_to_le16(
2004                         crc_itu_t(0, (char *)lvid + sizeof(struct tag),
2005                                 le16_to_cpu(lvid->descTag.descCRCLength)));
2006
2007         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
2008         /*
2009          * We set buffer uptodate unconditionally here to avoid spurious
2010          * warnings from mark_buffer_dirty() when previous EIO has marked
2011          * the buffer as !uptodate
2012          */
2013         set_buffer_uptodate(bh);
2014         mark_buffer_dirty(bh);
2015         sbi->s_lvid_dirty = 0;
2016         mutex_unlock(&sbi->s_alloc_mutex);
2017         /* Make closing of filesystem visible on the media immediately */
2018         sync_dirty_buffer(bh);
2019 }
2020
2021 u64 lvid_get_unique_id(struct super_block *sb)
2022 {
2023         struct buffer_head *bh;
2024         struct udf_sb_info *sbi = UDF_SB(sb);
2025         struct logicalVolIntegrityDesc *lvid;
2026         struct logicalVolHeaderDesc *lvhd;
2027         u64 uniqueID;
2028         u64 ret;
2029
2030         bh = sbi->s_lvid_bh;
2031         if (!bh)
2032                 return 0;
2033
2034         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
2035         lvhd = (struct logicalVolHeaderDesc *)lvid->logicalVolContentsUse;
2036
2037         mutex_lock(&sbi->s_alloc_mutex);
2038         ret = uniqueID = le64_to_cpu(lvhd->uniqueID);
2039         if (!(++uniqueID & 0xFFFFFFFF))
2040                 uniqueID += 16;
2041         lvhd->uniqueID = cpu_to_le64(uniqueID);
2042         mutex_unlock(&sbi->s_alloc_mutex);
2043         mark_buffer_dirty(bh);
2044
2045         return ret;
2046 }
2047
2048 static int udf_fill_super(struct super_block *sb, void *options, int silent)
2049 {
2050         int ret = -EINVAL;
2051         struct inode *inode = NULL;
2052         struct udf_options uopt;
2053         struct kernel_lb_addr rootdir, fileset;
2054         struct udf_sb_info *sbi;
2055
2056         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
2057         uopt.uid = INVALID_UID;
2058         uopt.gid = INVALID_GID;
2059         uopt.umask = 0;
2060         uopt.fmode = UDF_INVALID_MODE;
2061         uopt.dmode = UDF_INVALID_MODE;
2062
2063         sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
2064         if (!sbi)
2065                 return -ENOMEM;
2066
2067         sb->s_fs_info = sbi;
2068
2069         mutex_init(&sbi->s_alloc_mutex);
2070
2071         if (!udf_parse_options((char *)options, &uopt, false))
2072                 goto error_out;
2073
2074         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
2075             uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
2076                 udf_err(sb, "utf8 cannot be combined with iocharset\n");
2077                 goto error_out;
2078         }
2079 #ifdef CONFIG_UDF_NLS
2080         if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
2081                 uopt.nls_map = load_nls_default();
2082                 if (!uopt.nls_map)
2083                         uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
2084                 else
2085                         udf_debug("Using default NLS map\n");
2086         }
2087 #endif
2088         if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
2089                 uopt.flags |= (1 << UDF_FLAG_UTF8);
2090
2091         fileset.logicalBlockNum = 0xFFFFFFFF;
2092         fileset.partitionReferenceNum = 0xFFFF;
2093
2094         sbi->s_flags = uopt.flags;
2095         sbi->s_uid = uopt.uid;
2096         sbi->s_gid = uopt.gid;
2097         sbi->s_umask = uopt.umask;
2098         sbi->s_fmode = uopt.fmode;
2099         sbi->s_dmode = uopt.dmode;
2100         sbi->s_nls_map = uopt.nls_map;
2101         rwlock_init(&sbi->s_cred_lock);
2102
2103         if (uopt.session == 0xFFFFFFFF)
2104                 sbi->s_session = udf_get_last_session(sb);
2105         else
2106                 sbi->s_session = uopt.session;
2107
2108         udf_debug("Multi-session=%d\n", sbi->s_session);
2109
2110         /* Fill in the rest of the superblock */
2111         sb->s_op = &udf_sb_ops;
2112         sb->s_export_op = &udf_export_ops;
2113
2114         sb->s_magic = UDF_SUPER_MAGIC;
2115         sb->s_time_gran = 1000;
2116
2117         if (uopt.flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) {
2118                 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
2119         } else {
2120                 uopt.blocksize = bdev_logical_block_size(sb->s_bdev);
2121                 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
2122                 if (ret == -EAGAIN && uopt.blocksize != UDF_DEFAULT_BLOCKSIZE) {
2123                         if (!silent)
2124                                 pr_notice("Rescanning with blocksize %d\n",
2125                                           UDF_DEFAULT_BLOCKSIZE);
2126                         brelse(sbi->s_lvid_bh);
2127                         sbi->s_lvid_bh = NULL;
2128                         uopt.blocksize = UDF_DEFAULT_BLOCKSIZE;
2129                         ret = udf_load_vrs(sb, &uopt, silent, &fileset);
2130                 }
2131         }
2132         if (ret < 0) {
2133                 if (ret == -EAGAIN) {
2134                         udf_warn(sb, "No partition found (1)\n");
2135                         ret = -EINVAL;
2136                 }
2137                 goto error_out;
2138         }
2139
2140         udf_debug("Lastblock=%d\n", sbi->s_last_block);
2141
2142         if (sbi->s_lvid_bh) {
2143                 struct logicalVolIntegrityDescImpUse *lvidiu =
2144                                                         udf_sb_lvidiu(sb);
2145                 uint16_t minUDFReadRev;
2146                 uint16_t minUDFWriteRev;
2147
2148                 if (!lvidiu) {
2149                         ret = -EINVAL;
2150                         goto error_out;
2151                 }
2152                 minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
2153                 minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
2154                 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
2155                         udf_err(sb, "minUDFReadRev=%x (max is %x)\n",
2156                                 minUDFReadRev,
2157                                 UDF_MAX_READ_VERSION);
2158                         ret = -EINVAL;
2159                         goto error_out;
2160                 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION &&
2161                            !(sb->s_flags & MS_RDONLY)) {
2162                         ret = -EACCES;
2163                         goto error_out;
2164                 }
2165
2166                 sbi->s_udfrev = minUDFWriteRev;
2167
2168                 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
2169                         UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
2170                 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
2171                         UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
2172         }
2173
2174         if (!sbi->s_partitions) {
2175                 udf_warn(sb, "No partition found (2)\n");
2176                 ret = -EINVAL;
2177                 goto error_out;
2178         }
2179
2180         if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
2181                         UDF_PART_FLAG_READ_ONLY &&
2182             !(sb->s_flags & MS_RDONLY)) {
2183                 ret = -EACCES;
2184                 goto error_out;
2185         }
2186
2187         if (udf_find_fileset(sb, &fileset, &rootdir)) {
2188                 udf_warn(sb, "No fileset found\n");
2189                 ret = -EINVAL;
2190                 goto error_out;
2191         }
2192
2193         if (!silent) {
2194                 struct timestamp ts;
2195                 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
2196                 udf_info("Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
2197                          sbi->s_volume_ident,
2198                          le16_to_cpu(ts.year), ts.month, ts.day,
2199                          ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
2200         }
2201         if (!(sb->s_flags & MS_RDONLY))
2202                 udf_open_lvid(sb);
2203
2204         /* Assign the root inode */
2205         /* assign inodes by physical block number */
2206         /* perhaps it's not extensible enough, but for now ... */
2207         inode = udf_iget(sb, &rootdir);
2208         if (!inode) {
2209                 udf_err(sb, "Error in udf_iget, block=%d, partition=%d\n",
2210                        rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
2211                 ret = -EIO;
2212                 goto error_out;
2213         }
2214
2215         /* Allocate a dentry for the root inode */
2216         sb->s_root = d_make_root(inode);
2217         if (!sb->s_root) {
2218                 udf_err(sb, "Couldn't allocate root dentry\n");
2219                 ret = -ENOMEM;
2220                 goto error_out;
2221         }
2222         sb->s_maxbytes = MAX_LFS_FILESIZE;
2223         sb->s_max_links = UDF_MAX_LINKS;
2224         return 0;
2225
2226 error_out:
2227         if (sbi->s_vat_inode)
2228                 iput(sbi->s_vat_inode);
2229 #ifdef CONFIG_UDF_NLS
2230         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2231                 unload_nls(sbi->s_nls_map);
2232 #endif
2233         if (!(sb->s_flags & MS_RDONLY))
2234                 udf_close_lvid(sb);
2235         brelse(sbi->s_lvid_bh);
2236         udf_sb_free_partitions(sb);
2237         kfree(sbi);
2238         sb->s_fs_info = NULL;
2239
2240         return ret;
2241 }
2242
2243 void _udf_err(struct super_block *sb, const char *function,
2244               const char *fmt, ...)
2245 {
2246         struct va_format vaf;
2247         va_list args;
2248
2249         va_start(args, fmt);
2250
2251         vaf.fmt = fmt;
2252         vaf.va = &args;
2253
2254         pr_err("error (device %s): %s: %pV", sb->s_id, function, &vaf);
2255
2256         va_end(args);
2257 }
2258
2259 void _udf_warn(struct super_block *sb, const char *function,
2260                const char *fmt, ...)
2261 {
2262         struct va_format vaf;
2263         va_list args;
2264
2265         va_start(args, fmt);
2266
2267         vaf.fmt = fmt;
2268         vaf.va = &args;
2269
2270         pr_warn("warning (device %s): %s: %pV", sb->s_id, function, &vaf);
2271
2272         va_end(args);
2273 }
2274
2275 static void udf_put_super(struct super_block *sb)
2276 {
2277         struct udf_sb_info *sbi;
2278
2279         sbi = UDF_SB(sb);
2280
2281         if (sbi->s_vat_inode)
2282                 iput(sbi->s_vat_inode);
2283 #ifdef CONFIG_UDF_NLS
2284         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2285                 unload_nls(sbi->s_nls_map);
2286 #endif
2287         if (!(sb->s_flags & MS_RDONLY))
2288                 udf_close_lvid(sb);
2289         brelse(sbi->s_lvid_bh);
2290         udf_sb_free_partitions(sb);
2291         kfree(sb->s_fs_info);
2292         sb->s_fs_info = NULL;
2293 }
2294
2295 static int udf_sync_fs(struct super_block *sb, int wait)
2296 {
2297         struct udf_sb_info *sbi = UDF_SB(sb);
2298
2299         mutex_lock(&sbi->s_alloc_mutex);
2300         if (sbi->s_lvid_dirty) {
2301                 /*
2302                  * Blockdevice will be synced later so we don't have to submit
2303                  * the buffer for IO
2304                  */
2305                 mark_buffer_dirty(sbi->s_lvid_bh);
2306                 sbi->s_lvid_dirty = 0;
2307         }
2308         mutex_unlock(&sbi->s_alloc_mutex);
2309
2310         return 0;
2311 }
2312
2313 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
2314 {
2315         struct super_block *sb = dentry->d_sb;
2316         struct udf_sb_info *sbi = UDF_SB(sb);
2317         struct logicalVolIntegrityDescImpUse *lvidiu;
2318         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
2319
2320         lvidiu = udf_sb_lvidiu(sb);
2321         buf->f_type = UDF_SUPER_MAGIC;
2322         buf->f_bsize = sb->s_blocksize;
2323         buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
2324         buf->f_bfree = udf_count_free(sb);
2325         buf->f_bavail = buf->f_bfree;
2326         buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2327                                           le32_to_cpu(lvidiu->numDirs)) : 0)
2328                         + buf->f_bfree;
2329         buf->f_ffree = buf->f_bfree;
2330         buf->f_namelen = UDF_NAME_LEN - 2;
2331         buf->f_fsid.val[0] = (u32)id;
2332         buf->f_fsid.val[1] = (u32)(id >> 32);
2333
2334         return 0;
2335 }
2336
2337 static unsigned int udf_count_free_bitmap(struct super_block *sb,
2338                                           struct udf_bitmap *bitmap)
2339 {
2340         struct buffer_head *bh = NULL;
2341         unsigned int accum = 0;
2342         int index;
2343         int block = 0, newblock;
2344         struct kernel_lb_addr loc;
2345         uint32_t bytes;
2346         uint8_t *ptr;
2347         uint16_t ident;
2348         struct spaceBitmapDesc *bm;
2349
2350         loc.logicalBlockNum = bitmap->s_extPosition;
2351         loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
2352         bh = udf_read_ptagged(sb, &loc, 0, &ident);
2353
2354         if (!bh) {
2355                 udf_err(sb, "udf_count_free failed\n");
2356                 goto out;
2357         } else if (ident != TAG_IDENT_SBD) {
2358                 brelse(bh);
2359                 udf_err(sb, "udf_count_free failed\n");
2360                 goto out;
2361         }
2362
2363         bm = (struct spaceBitmapDesc *)bh->b_data;
2364         bytes = le32_to_cpu(bm->numOfBytes);
2365         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2366         ptr = (uint8_t *)bh->b_data;
2367
2368         while (bytes > 0) {
2369                 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2370                 accum += bitmap_weight((const unsigned long *)(ptr + index),
2371                                         cur_bytes * 8);
2372                 bytes -= cur_bytes;
2373                 if (bytes) {
2374                         brelse(bh);
2375                         newblock = udf_get_lb_pblock(sb, &loc, ++block);
2376                         bh = udf_tread(sb, newblock);
2377                         if (!bh) {
2378                                 udf_debug("read failed\n");
2379                                 goto out;
2380                         }
2381                         index = 0;
2382                         ptr = (uint8_t *)bh->b_data;
2383                 }
2384         }
2385         brelse(bh);
2386 out:
2387         return accum;
2388 }
2389
2390 static unsigned int udf_count_free_table(struct super_block *sb,
2391                                          struct inode *table)
2392 {
2393         unsigned int accum = 0;
2394         uint32_t elen;
2395         struct kernel_lb_addr eloc;
2396         int8_t etype;
2397         struct extent_position epos;
2398
2399         mutex_lock(&UDF_SB(sb)->s_alloc_mutex);
2400         epos.block = UDF_I(table)->i_location;
2401         epos.offset = sizeof(struct unallocSpaceEntry);
2402         epos.bh = NULL;
2403
2404         while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2405                 accum += (elen >> table->i_sb->s_blocksize_bits);
2406
2407         brelse(epos.bh);
2408         mutex_unlock(&UDF_SB(sb)->s_alloc_mutex);
2409
2410         return accum;
2411 }
2412
2413 static unsigned int udf_count_free(struct super_block *sb)
2414 {
2415         unsigned int accum = 0;
2416         struct udf_sb_info *sbi;
2417         struct udf_part_map *map;
2418
2419         sbi = UDF_SB(sb);
2420         if (sbi->s_lvid_bh) {
2421                 struct logicalVolIntegrityDesc *lvid =
2422                         (struct logicalVolIntegrityDesc *)
2423                         sbi->s_lvid_bh->b_data;
2424                 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
2425                         accum = le32_to_cpu(
2426                                         lvid->freeSpaceTable[sbi->s_partition]);
2427                         if (accum == 0xFFFFFFFF)
2428                                 accum = 0;
2429                 }
2430         }
2431
2432         if (accum)
2433                 return accum;
2434
2435         map = &sbi->s_partmaps[sbi->s_partition];
2436         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2437                 accum += udf_count_free_bitmap(sb,
2438                                                map->s_uspace.s_bitmap);
2439         }
2440         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
2441                 accum += udf_count_free_bitmap(sb,
2442                                                map->s_fspace.s_bitmap);
2443         }
2444         if (accum)
2445                 return accum;
2446
2447         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2448                 accum += udf_count_free_table(sb,
2449                                               map->s_uspace.s_table);
2450         }
2451         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
2452                 accum += udf_count_free_table(sb,
2453                                               map->s_fspace.s_table);
2454         }
2455
2456         return accum;
2457 }