fs/udf/super.c

   1 /*
   2  * super.c
   3  *
   4  * PURPOSE
   5  *  Super block routines for the OSTA-UDF(tm) filesystem.
   6  *
   7  * DESCRIPTION
   8  *  OSTA-UDF(tm) = Optical Storage Technology Association
   9  *  Universal Disk Format.
  10  *
  11  *  This code is based on version 2.00 of the UDF specification,
  12  *  and revision 3 of the ECMA 167 standard [equivalent to ISO 13346].
  13  *    http://www.osta.org/
  14  *    http://www.ecma.ch/
  15  *    http://www.iso.org/
  16  *
  17  * COPYRIGHT
  18  *  This file is distributed under the terms of the GNU General Public
  19  *  License (GPL). Copies of the GPL can be obtained from:
  20  *    ftp://prep.ai.mit.edu/pub/gnu/GPL
  21  *  Each contributing author retains all rights to their own work.
  22  *
  23  *  (C) 1998 Dave Boynton
  24  *  (C) 1998-2004 Ben Fennema
  25  *  (C) 2000 Stelias Computing Inc
  26  *
  27  * HISTORY
  28  *
  29  *  09/24/98 dgb  changed to allow compiling outside of kernel, and
  30  *                added some debugging.
  31  *  10/01/98 dgb  updated to allow (some) possibility of compiling w/2.0.34
  32  *  10/16/98      attempting some multi-session support
  33  *  10/17/98      added freespace count for "df"
  34  *  11/11/98 gr   added novrs option
  35  *  11/26/98 dgb  added fileset,anchor mount options
  36  *  12/06/98 blf  really hosed things royally. vat/sparing support. sequenced
  37  *                vol descs. rewrote option handling based on isofs
  38  *  12/20/98      find the free space bitmap (if it exists)
  39  */
  40
  41 #include "udfdecl.h"
  42
  43 #include <linux/blkdev.h>
  44 #include <linux/slab.h>
  45 #include <linux/kernel.h>
  46 #include <linux/module.h>
  47 #include <linux/parser.h>
  48 #include <linux/stat.h>
  49 #include <linux/cdrom.h>
  50 #include <linux/nls.h>
  51 #include <linux/vfs.h>
  52 #include <linux/vmalloc.h>
  53 #include <linux/errno.h>
  54 #include <linux/mount.h>
  55 #include <linux/seq_file.h>
  56 #include <linux/bitmap.h>
  57 #include <linux/crc-itu-t.h>
  58 #include <linux/log2.h>
  59 #include <asm/byteorder.h>
  60
  61 #include "udf_sb.h"
  62 #include "udf_i.h"
  63
  64 #include <linux/init.h>
  65 #include <linux/uaccess.h>
  66
  67 enum {
  68         VDS_POS_PRIMARY_VOL_DESC,
  69         VDS_POS_UNALLOC_SPACE_DESC,
  70         VDS_POS_LOGICAL_VOL_DESC,
  71         VDS_POS_IMP_USE_VOL_DESC,
  72         VDS_POS_LENGTH
  73 };
  74
  75 #define VSD_FIRST_SECTOR_OFFSET         32768
  76 #define VSD_MAX_SECTOR_OFFSET           0x800000
  77
  78 /*
  79  * Maximum number of Terminating Descriptor / Logical Volume Integrity
  80  * Descriptor redirections. The chosen numbers are arbitrary - just that we
  81  * hopefully don't limit any real use of rewritten inode on write-once media
  82  * but avoid looping for too long on corrupted media.
  83  */
  84 #define UDF_MAX_TD_NESTING 64
  85 #define UDF_MAX_LVID_NESTING 1000
  86
  87 enum { UDF_MAX_LINKS = 0xffff };
  88
  89 /* These are the "meat" - everything else is stuffing */
  90 static int udf_fill_super(struct super_block *, void *, int);
  91 static void udf_put_super(struct super_block *);
  92 static int udf_sync_fs(struct super_block *, int);
  93 static int udf_remount_fs(struct super_block *, int *, char *);
  94 static void udf_load_logicalvolint(struct super_block *, struct kernel_extent_ad);
  95 static int udf_find_fileset(struct super_block *, struct kernel_lb_addr *,
  96                             struct kernel_lb_addr *);
  97 static void udf_load_fileset(struct super_block *, struct buffer_head *,
  98                              struct kernel_lb_addr *);
  99 static void udf_open_lvid(struct super_block *);
 100 static void udf_close_lvid(struct super_block *);
 101 static unsigned int udf_count_free(struct super_block *);
 102 static int udf_statfs(struct dentry *, struct kstatfs *);
 103 static int udf_show_options(struct seq_file *, struct dentry *);
 104
 105 struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct super_block *sb)
 106 {
 107         struct logicalVolIntegrityDesc *lvid;
 108         unsigned int partnum;
 109         unsigned int offset;
 110
 111         if (!UDF_SB(sb)->s_lvid_bh)
 112                 return NULL;
 113         lvid = (struct logicalVolIntegrityDesc *)UDF_SB(sb)->s_lvid_bh->b_data;
 114         partnum = le32_to_cpu(lvid->numOfPartitions);
 115         if ((sb->s_blocksize - sizeof(struct logicalVolIntegrityDescImpUse) -
 116              offsetof(struct logicalVolIntegrityDesc, impUse)) /
 117              (2 * sizeof(uint32_t)) < partnum) {
 118                 udf_err(sb, "Logical volume integrity descriptor corrupted "
 119                         "(numOfPartitions = %u)!\n", partnum);
 120                 return NULL;
 121         }
 122         /* The offset is to skip freeSpaceTable and sizeTable arrays */
 123         offset = partnum * 2 * sizeof(uint32_t);
 124         return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
 125 }
 126
 127 /* UDF filesystem type */
 128 static struct dentry *udf_mount(struct file_system_type *fs_type,
 129                       int flags, const char *dev_name, void *data)
 130 {
 131         return mount_bdev(fs_type, flags, dev_name, data, udf_fill_super);
 132 }
 133
 134 static struct file_system_type udf_fstype = {
 135         .owner          = THIS_MODULE,
 136         .name           = "udf",
 137         .mount          = udf_mount,
 138         .kill_sb        = kill_block_super,
 139         .fs_flags       = FS_REQUIRES_DEV,
 140 };
 141 MODULE_ALIAS_FS("udf");
 142
 143 static struct kmem_cache *udf_inode_cachep;
 144
 145 static struct inode *udf_alloc_inode(struct super_block *sb)
 146 {
 147         struct udf_inode_info *ei;
 148         ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
 149         if (!ei)
 150                 return NULL;
 151
 152         ei->i_unique = 0;
 153         ei->i_lenExtents = 0;
 154         ei->i_next_alloc_block = 0;
 155         ei->i_next_alloc_goal = 0;
 156         ei->i_strat4096 = 0;
 157         init_rwsem(&ei->i_data_sem);
 158         ei->cached_extent.lstart = -1;
 159         spin_lock_init(&ei->i_extent_cache_lock);
 160
 161         return &ei->vfs_inode;
 162 }
 163
 164 static void udf_i_callback(struct rcu_head *head)
 165 {
 166         struct inode *inode = container_of(head, struct inode, i_rcu);
 167         kmem_cache_free(udf_inode_cachep, UDF_I(inode));
 168 }
 169
 170 static void udf_destroy_inode(struct inode *inode)
 171 {
 172         call_rcu(&inode->i_rcu, udf_i_callback);
 173 }
 174
 175 static void init_once(void *foo)
 176 {
 177         struct udf_inode_info *ei = (struct udf_inode_info *)foo;
 178
 179         ei->i_ext.i_data = NULL;
 180         inode_init_once(&ei->vfs_inode);
 181 }
 182
 183 static int __init init_inodecache(void)
 184 {
 185         udf_inode_cachep = kmem_cache_create("udf_inode_cache",
 186                                              sizeof(struct udf_inode_info),
 187                                              0, (SLAB_RECLAIM_ACCOUNT |
 188                                                  SLAB_MEM_SPREAD |
 189                                                  SLAB_ACCOUNT),
 190                                              init_once);
 191         if (!udf_inode_cachep)
 192                 return -ENOMEM;
 193         return 0;
 194 }
 195
 196 static void destroy_inodecache(void)
 197 {
 198         /*
 199          * Make sure all delayed rcu free inodes are flushed before we
 200          * destroy cache.
 201          */
 202         rcu_barrier();
 203         kmem_cache_destroy(udf_inode_cachep);
 204 }
 205
 206 /* Superblock operations */
 207 static const struct super_operations udf_sb_ops = {
 208         .alloc_inode    = udf_alloc_inode,
 209         .destroy_inode  = udf_destroy_inode,
 210         .write_inode    = udf_write_inode,
 211         .evict_inode    = udf_evict_inode,
 212         .put_super      = udf_put_super,
 213         .sync_fs        = udf_sync_fs,
 214         .statfs         = udf_statfs,
 215         .remount_fs     = udf_remount_fs,
 216         .show_options   = udf_show_options,
 217 };
 218
 219 struct udf_options {
 220         unsigned char novrs;
 221         unsigned int blocksize;
 222         unsigned int session;
 223         unsigned int lastblock;
 224         unsigned int anchor;
 225         unsigned int flags;
 226         umode_t umask;
 227         kgid_t gid;
 228         kuid_t uid;
 229         umode_t fmode;
 230         umode_t dmode;
 231         struct nls_table *nls_map;
 232 };
 233
 234 static int __init init_udf_fs(void)
 235 {
 236         int err;
 237
 238         err = init_inodecache();
 239         if (err)
 240                 goto out1;
 241         err = register_filesystem(&udf_fstype);
 242         if (err)
 243                 goto out;
 244
 245         return 0;
 246
 247 out:
 248         destroy_inodecache();
 249
 250 out1:
 251         return err;
 252 }
 253
 254 static void __exit exit_udf_fs(void)
 255 {
 256         unregister_filesystem(&udf_fstype);
 257         destroy_inodecache();
 258 }
 259
 260 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
 261 {
 262         struct udf_sb_info *sbi = UDF_SB(sb);
 263
 264         sbi->s_partmaps = kcalloc(count, sizeof(*sbi->s_partmaps), GFP_KERNEL);
 265         if (!sbi->s_partmaps) {
 266                 sbi->s_partitions = 0;
 267                 return -ENOMEM;
 268         }
 269
 270         sbi->s_partitions = count;
 271         return 0;
 272 }
 273
 274 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
 275 {
 276         int i;
 277         int nr_groups = bitmap->s_nr_groups;
 278
 279         for (i = 0; i < nr_groups; i++)
 280                 if (bitmap->s_block_bitmap[i])
 281                         brelse(bitmap->s_block_bitmap[i]);
 282
 283         kvfree(bitmap);
 284 }
 285
 286 static void udf_free_partition(struct udf_part_map *map)
 287 {
 288         int i;
 289         struct udf_meta_data *mdata;
 290
 291         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
 292                 iput(map->s_uspace.s_table);
 293         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
 294                 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
 295         if (map->s_partition_type == UDF_SPARABLE_MAP15)
 296                 for (i = 0; i < 4; i++)
 297                         brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
 298         else if (map->s_partition_type == UDF_METADATA_MAP25) {
 299                 mdata = &map->s_type_specific.s_metadata;
 300                 iput(mdata->s_metadata_fe);
 301                 mdata->s_metadata_fe = NULL;
 302
 303                 iput(mdata->s_mirror_fe);
 304                 mdata->s_mirror_fe = NULL;
 305
 306                 iput(mdata->s_bitmap_fe);
 307                 mdata->s_bitmap_fe = NULL;
 308         }
 309 }
 310
 311 static void udf_sb_free_partitions(struct super_block *sb)
 312 {
 313         struct udf_sb_info *sbi = UDF_SB(sb);
 314         int i;
 315
 316         if (!sbi->s_partmaps)
 317                 return;
 318         for (i = 0; i < sbi->s_partitions; i++)
 319                 udf_free_partition(&sbi->s_partmaps[i]);
 320         kfree(sbi->s_partmaps);
 321         sbi->s_partmaps = NULL;
 322 }
 323
 324 static int udf_show_options(struct seq_file *seq, struct dentry *root)
 325 {
 326         struct super_block *sb = root->d_sb;
 327         struct udf_sb_info *sbi = UDF_SB(sb);
 328
 329         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
 330                 seq_puts(seq, ",nostrict");
 331         if (UDF_QUERY_FLAG(sb, UDF_FLAG_BLOCKSIZE_SET))
 332                 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
 333         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
 334                 seq_puts(seq, ",unhide");
 335         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
 336                 seq_puts(seq, ",undelete");
 337         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
 338                 seq_puts(seq, ",noadinicb");
 339         if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
 340                 seq_puts(seq, ",shortad");
 341         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
 342                 seq_puts(seq, ",uid=forget");
 343         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
 344                 seq_puts(seq, ",gid=forget");
 345         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
 346                 seq_printf(seq, ",uid=%u", from_kuid(&init_user_ns, sbi->s_uid));
 347         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
 348                 seq_printf(seq, ",gid=%u", from_kgid(&init_user_ns, sbi->s_gid));
 349         if (sbi->s_umask != 0)
 350                 seq_printf(seq, ",umask=%ho", sbi->s_umask);
 351         if (sbi->s_fmode != UDF_INVALID_MODE)
 352                 seq_printf(seq, ",mode=%ho", sbi->s_fmode);
 353         if (sbi->s_dmode != UDF_INVALID_MODE)
 354                 seq_printf(seq, ",dmode=%ho", sbi->s_dmode);
 355         if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
 356                 seq_printf(seq, ",session=%d", sbi->s_session);
 357         if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
 358                 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
 359         if (sbi->s_anchor != 0)
 360                 seq_printf(seq, ",anchor=%u", sbi->s_anchor);
 361         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
 362                 seq_puts(seq, ",utf8");
 363         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
 364                 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
 365
 366         return 0;
 367 }
 368
 369 /*
 370  * udf_parse_options
 371  *
 372  * PURPOSE
 373  *      Parse mount options.
 374  *
 375  * DESCRIPTION
 376  *      The following mount options are supported:
 377  *
 378  *      gid=            Set the default group.
 379  *      umask=          Set the default umask.
 380  *      mode=           Set the default file permissions.
 381  *      dmode=          Set the default directory permissions.
 382  *      uid=            Set the default user.
 383  *      bs=             Set the block size.
 384  *      unhide          Show otherwise hidden files.
 385  *      undelete        Show deleted files in lists.
 386  *      adinicb         Embed data in the inode (default)
 387  *      noadinicb       Don't embed data in the inode
 388  *      shortad         Use short ad's
 389  *      longad          Use long ad's (default)
 390  *      nostrict        Unset strict conformance
 391  *      iocharset=      Set the NLS character set
 392  *
 393  *      The remaining are for debugging and disaster recovery:
 394  *
 395  *      novrs           Skip volume sequence recognition
 396  *
 397  *      The following expect a offset from 0.
 398  *
 399  *      session=        Set the CDROM session (default= last session)
 400  *      anchor=         Override standard anchor location. (default= 256)
 401  *      volume=         Override the VolumeDesc location. (unused)
 402  *      partition=      Override the PartitionDesc location. (unused)
 403  *      lastblock=      Set the last block of the filesystem/
 404  *
 405  *      The following expect a offset from the partition root.
 406  *
 407  *      fileset=        Override the fileset block location. (unused)
 408  *      rootdir=        Override the root directory location. (unused)
 409  *              WARNING: overriding the rootdir to a non-directory may
 410  *              yield highly unpredictable results.
 411  *
 412  * PRE-CONDITIONS
 413  *      options         Pointer to mount options string.
 414  *      uopts           Pointer to mount options variable.
 415  *
 416  * POST-CONDITIONS
 417  *      <return>        1       Mount options parsed okay.
 418  *      <return>        0       Error parsing mount options.
 419  *
 420  * HISTORY
 421  *      July 1, 1997 - Andrew E. Mileski
 422  *      Written, tested, and released.
 423  */
 424
 425 enum {
 426         Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
 427         Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
 428         Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
 429         Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
 430         Opt_rootdir, Opt_utf8, Opt_iocharset,
 431         Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore,
 432         Opt_fmode, Opt_dmode
 433 };
 434
 435 static const match_table_t tokens = {
 436         {Opt_novrs,     "novrs"},
 437         {Opt_nostrict,  "nostrict"},
 438         {Opt_bs,        "bs=%u"},
 439         {Opt_unhide,    "unhide"},
 440         {Opt_undelete,  "undelete"},
 441         {Opt_noadinicb, "noadinicb"},
 442         {Opt_adinicb,   "adinicb"},
 443         {Opt_shortad,   "shortad"},
 444         {Opt_longad,    "longad"},
 445         {Opt_uforget,   "uid=forget"},
 446         {Opt_uignore,   "uid=ignore"},
 447         {Opt_gforget,   "gid=forget"},
 448         {Opt_gignore,   "gid=ignore"},
 449         {Opt_gid,       "gid=%u"},
 450         {Opt_uid,       "uid=%u"},
 451         {Opt_umask,     "umask=%o"},
 452         {Opt_session,   "session=%u"},
 453         {Opt_lastblock, "lastblock=%u"},
 454         {Opt_anchor,    "anchor=%u"},
 455         {Opt_volume,    "volume=%u"},
 456         {Opt_partition, "partition=%u"},
 457         {Opt_fileset,   "fileset=%u"},
 458         {Opt_rootdir,   "rootdir=%u"},
 459         {Opt_utf8,      "utf8"},
 460         {Opt_iocharset, "iocharset=%s"},
 461         {Opt_fmode,     "mode=%o"},
 462         {Opt_dmode,     "dmode=%o"},
 463         {Opt_err,       NULL}
 464 };
 465
 466 static int udf_parse_options(char *options, struct udf_options *uopt,
 467                              bool remount)
 468 {
 469         char *p;
 470         int option;
 471
 472         uopt->novrs = 0;
 473         uopt->session = 0xFFFFFFFF;
 474         uopt->lastblock = 0;
 475         uopt->anchor = 0;
 476
 477         if (!options)
 478                 return 1;
 479
 480         while ((p = strsep(&options, ",")) != NULL) {
 481                 substring_t args[MAX_OPT_ARGS];
 482                 int token;
 483                 unsigned n;
 484                 if (!*p)
 485                         continue;
 486
 487                 token = match_token(p, tokens, args);
 488                 switch (token) {
 489                 case Opt_novrs:
 490                         uopt->novrs = 1;
 491                         break;
 492                 case Opt_bs:
 493                         if (match_int(&args[0], &option))
 494                                 return 0;
 495                         n = option;
 496                         if (n != 512 && n != 1024 && n != 2048 && n != 4096)
 497                                 return 0;
 498                         uopt->blocksize = n;
 499                         uopt->flags |= (1 << UDF_FLAG_BLOCKSIZE_SET);
 500                         break;
 501                 case Opt_unhide:
 502                         uopt->flags |= (1 << UDF_FLAG_UNHIDE);
 503                         break;
 504                 case Opt_undelete:
 505                         uopt->flags |= (1 << UDF_FLAG_UNDELETE);
 506                         break;
 507                 case Opt_noadinicb:
 508                         uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
 509                         break;
 510                 case Opt_adinicb:
 511                         uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
 512                         break;
 513                 case Opt_shortad:
 514                         uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
 515                         break;
 516                 case Opt_longad:
 517                         uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
 518                         break;
 519                 case Opt_gid:
 520                         if (match_int(args, &option))
 521                                 return 0;
 522                         uopt->gid = make_kgid(current_user_ns(), option);
 523                         if (!gid_valid(uopt->gid))
 524                                 return 0;
 525                         uopt->flags |= (1 << UDF_FLAG_GID_SET);
 526                         break;
 527                 case Opt_uid:
 528                         if (match_int(args, &option))
 529                                 return 0;
 530                         uopt->uid = make_kuid(current_user_ns(), option);
 531                         if (!uid_valid(uopt->uid))
 532                                 return 0;
 533                         uopt->flags |= (1 << UDF_FLAG_UID_SET);
 534                         break;
 535                 case Opt_umask:
 536                         if (match_octal(args, &option))
 537                                 return 0;
 538                         uopt->umask = option;
 539                         break;
 540                 case Opt_nostrict:
 541                         uopt->flags &= ~(1 << UDF_FLAG_STRICT);
 542                         break;
 543                 case Opt_session:
 544                         if (match_int(args, &option))
 545                                 return 0;
 546                         uopt->session = option;
 547                         if (!remount)
 548                                 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
 549                         break;
 550                 case Opt_lastblock:
 551                         if (match_int(args, &option))
 552                                 return 0;
 553                         uopt->lastblock = option;
 554                         if (!remount)
 555                                 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
 556                         break;
 557                 case Opt_anchor:
 558                         if (match_int(args, &option))
 559                                 return 0;
 560                         uopt->anchor = option;
 561                         break;
 562                 case Opt_volume:
 563                 case Opt_partition:
 564                 case Opt_fileset:
 565                 case Opt_rootdir:
 566                         /* Ignored (never implemented properly) */
 567                         break;
 568                 case Opt_utf8:
 569                         uopt->flags |= (1 << UDF_FLAG_UTF8);
 570                         break;
 571                 case Opt_iocharset:
 572                         if (!remount) {
 573                                 if (uopt->nls_map)
 574                                         unload_nls(uopt->nls_map);
 575                                 uopt->nls_map = load_nls(args[0].from);
 576                                 uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
 577                         }
 578                         break;
 579                 case Opt_uforget:
 580                         uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
 581                         break;
 582                 case Opt_uignore:
 583                 case Opt_gignore:
 584                         /* These options are superseeded by uid=<number> */
 585                         break;
 586                 case Opt_gforget:
 587                         uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
 588                         break;
 589                 case Opt_fmode:
 590                         if (match_octal(args, &option))
 591                                 return 0;
 592                         uopt->fmode = option & 0777;
 593                         break;
 594                 case Opt_dmode:
 595                         if (match_octal(args, &option))
 596                                 return 0;
 597                         uopt->dmode = option & 0777;
 598                         break;
 599                 default:
 600                         pr_err("bad mount option \"%s\" or missing value\n", p);
 601                         return 0;
 602                 }
 603         }
 604         return 1;
 605 }
 606
 607 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
 608 {
 609         struct udf_options uopt;
 610         struct udf_sb_info *sbi = UDF_SB(sb);
 611         int error = 0;
 612
 613         if (!(*flags & SB_RDONLY) && UDF_QUERY_FLAG(sb, UDF_FLAG_RW_INCOMPAT))
 614                 return -EACCES;
 615
 616         sync_filesystem(sb);
 617
 618         uopt.flags = sbi->s_flags;
 619         uopt.uid   = sbi->s_uid;
 620         uopt.gid   = sbi->s_gid;
 621         uopt.umask = sbi->s_umask;
 622         uopt.fmode = sbi->s_fmode;
 623         uopt.dmode = sbi->s_dmode;
 624         uopt.nls_map = NULL;
 625
 626         if (!udf_parse_options(options, &uopt, true))
 627                 return -EINVAL;
 628
 629         write_lock(&sbi->s_cred_lock);
 630         sbi->s_flags = uopt.flags;
 631         sbi->s_uid   = uopt.uid;
 632         sbi->s_gid   = uopt.gid;
 633         sbi->s_umask = uopt.umask;
 634         sbi->s_fmode = uopt.fmode;
 635         sbi->s_dmode = uopt.dmode;
 636         write_unlock(&sbi->s_cred_lock);
 637
 638         if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
 639                 goto out_unlock;
 640
 641         if (*flags & SB_RDONLY)
 642                 udf_close_lvid(sb);
 643         else
 644                 udf_open_lvid(sb);
 645
 646 out_unlock:
 647         return error;
 648 }
 649
 650 /* Check Volume Structure Descriptors (ECMA 167 2/9.1) */
 651 /* We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
 652 static loff_t udf_check_vsd(struct super_block *sb)
 653 {
 654         struct volStructDesc *vsd = NULL;
 655         loff_t sector = VSD_FIRST_SECTOR_OFFSET;
 656         int sectorsize;
 657         struct buffer_head *bh = NULL;
 658         int nsr02 = 0;
 659         int nsr03 = 0;
 660         struct udf_sb_info *sbi;
 661
 662         sbi = UDF_SB(sb);
 663         if (sb->s_blocksize < sizeof(struct volStructDesc))
 664                 sectorsize = sizeof(struct volStructDesc);
 665         else
 666                 sectorsize = sb->s_blocksize;
 667
 668         sector += (((loff_t)sbi->s_session) << sb->s_blocksize_bits);
 669
 670         udf_debug("Starting at sector %u (%lu byte sectors)\n",
 671                   (unsigned int)(sector >> sb->s_blocksize_bits),
 672                   sb->s_blocksize);
 673         /* Process the sequence (if applicable). The hard limit on the sector
 674          * offset is arbitrary, hopefully large enough so that all valid UDF
 675          * filesystems will be recognised. There is no mention of an upper
 676          * bound to the size of the volume recognition area in the standard.
 677          *  The limit will prevent the code to read all the sectors of a
 678          * specially crafted image (like a bluray disc full of CD001 sectors),
 679          * potentially causing minutes or even hours of uninterruptible I/O
 680          * activity. This actually happened with uninitialised SSD partitions
 681          * (all 0xFF) before the check for the limit and all valid IDs were
 682          * added */
 683         for (; !nsr02 && !nsr03 && sector < VSD_MAX_SECTOR_OFFSET;
 684              sector += sectorsize) {
 685                 /* Read a block */
 686                 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
 687                 if (!bh)
 688                         break;
 689
 690                 /* Look for ISO  descriptors */
 691                 vsd = (struct volStructDesc *)(bh->b_data +
 692                                               (sector & (sb->s_blocksize - 1)));
 693
 694                 if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
 695                                     VSD_STD_ID_LEN)) {
 696                         switch (vsd->structType) {
 697                         case 0:
 698                                 udf_debug("ISO9660 Boot Record found\n");
 699                                 break;
 700                         case 1:
 701                                 udf_debug("ISO9660 Primary Volume Descriptor found\n");
 702                                 break;
 703                         case 2:
 704                                 udf_debug("ISO9660 Supplementary Volume Descriptor found\n");
 705                                 break;
 706                         case 3:
 707                                 udf_debug("ISO9660 Volume Partition Descriptor found\n");
 708                                 break;
 709                         case 255:
 710                                 udf_debug("ISO9660 Volume Descriptor Set Terminator found\n");
 711                                 break;
 712                         default:
 713                                 udf_debug("ISO9660 VRS (%u) found\n",
 714                                           vsd->structType);
 715                                 break;
 716                         }
 717                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
 718                                     VSD_STD_ID_LEN))
 719                         ; /* nothing */
 720                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
 721                                     VSD_STD_ID_LEN)) {
 722                         brelse(bh);
 723                         break;
 724                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
 725                                     VSD_STD_ID_LEN))
 726                         nsr02 = sector;
 727                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
 728                                     VSD_STD_ID_LEN))
 729                         nsr03 = sector;
 730                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BOOT2,
 731                                     VSD_STD_ID_LEN))
 732                         ; /* nothing */
 733                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CDW02,
 734                                     VSD_STD_ID_LEN))
 735                         ; /* nothing */
 736                 else {
 737                         /* invalid id : end of volume recognition area */
 738                         brelse(bh);
 739                         break;
 740                 }
 741                 brelse(bh);
 742         }
 743
 744         if (nsr03)
 745                 return nsr03;
 746         else if (nsr02)
 747                 return nsr02;
 748         else if (!bh && sector - (sbi->s_session << sb->s_blocksize_bits) ==
 749                         VSD_FIRST_SECTOR_OFFSET)
 750                 return -1;
 751         else
 752                 return 0;
 753 }
 754
 755 static int udf_find_fileset(struct super_block *sb,
 756                             struct kernel_lb_addr *fileset,
 757                             struct kernel_lb_addr *root)
 758 {
 759         struct buffer_head *bh = NULL;
 760         uint16_t ident;
 761
 762         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
 763             fileset->partitionReferenceNum != 0xFFFF) {
 764                 bh = udf_read_ptagged(sb, fileset, 0, &ident);
 765
 766                 if (!bh) {
 767                         return 1;
 768                 } else if (ident != TAG_IDENT_FSD) {
 769                         brelse(bh);
 770                         return 1;
 771                 }
 772
 773                 udf_debug("Fileset at block=%u, partition=%u\n",
 774                           fileset->logicalBlockNum,
 775                           fileset->partitionReferenceNum);
 776
 777                 UDF_SB(sb)->s_partition = fileset->partitionReferenceNum;
 778                 udf_load_fileset(sb, bh, root);
 779                 brelse(bh);
 780                 return 0;
 781         }
 782         return 1;
 783 }
 784
 785 /*
 786  * Load primary Volume Descriptor Sequence
 787  *
 788  * Return <0 on error, 0 on success. -EAGAIN is special meaning next sequence
 789  * should be tried.
 790  */
 791 static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
 792 {
 793         struct primaryVolDesc *pvoldesc;
 794         uint8_t *outstr;
 795         struct buffer_head *bh;
 796         uint16_t ident;
 797         int ret = -ENOMEM;
 798 #ifdef UDFFS_DEBUG
 799         struct timestamp *ts;
 800 #endif
 801
 802         outstr = kmalloc(128, GFP_NOFS);
 803         if (!outstr)
 804                 return -ENOMEM;
 805
 806         bh = udf_read_tagged(sb, block, block, &ident);
 807         if (!bh) {
 808                 ret = -EAGAIN;
 809                 goto out2;
 810         }
 811
 812         if (ident != TAG_IDENT_PVD) {
 813                 ret = -EIO;
 814                 goto out_bh;
 815         }
 816
 817         pvoldesc = (struct primaryVolDesc *)bh->b_data;
 818
 819         udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
 820                               pvoldesc->recordingDateAndTime);
 821 #ifdef UDFFS_DEBUG
 822         ts = &pvoldesc->recordingDateAndTime;
 823         udf_debug("recording time %04u/%02u/%02u %02u:%02u (%x)\n",
 824                   le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
 825                   ts->minute, le16_to_cpu(ts->typeAndTimezone));
 826 #endif
 827
 828
 829         ret = udf_dstrCS0toChar(sb, outstr, 31, pvoldesc->volIdent, 32);
 830         if (ret < 0) {
 831                 strcpy(UDF_SB(sb)->s_volume_ident, "InvalidName");
 832                 pr_warn("incorrect volume identification, setting to "
 833                         "'InvalidName'\n");
 834         } else {
 835                 strncpy(UDF_SB(sb)->s_volume_ident, outstr, ret);
 836         }
 837         udf_debug("volIdent[] = '%s'\n", UDF_SB(sb)->s_volume_ident);
 838
 839         ret = udf_dstrCS0toChar(sb, outstr, 127, pvoldesc->volSetIdent, 128);
 840         if (ret < 0) {
 841                 ret = 0;
 842                 goto out_bh;
 843         }
 844         outstr[ret] = 0;
 845         udf_debug("volSetIdent[] = '%s'\n", outstr);
 846
 847         ret = 0;
 848 out_bh:
 849         brelse(bh);
 850 out2:
 851         kfree(outstr);
 852         return ret;
 853 }
 854
 855 struct inode *udf_find_metadata_inode_efe(struct super_block *sb,
 856                                         u32 meta_file_loc, u32 partition_ref)
 857 {
 858         struct kernel_lb_addr addr;
 859         struct inode *metadata_fe;
 860
 861         addr.logicalBlockNum = meta_file_loc;
 862         addr.partitionReferenceNum = partition_ref;
 863
 864         metadata_fe = udf_iget_special(sb, &addr);
 865
 866         if (IS_ERR(metadata_fe)) {
 867                 udf_warn(sb, "metadata inode efe not found\n");
 868                 return metadata_fe;
 869         }
 870         if (UDF_I(metadata_fe)->i_alloc_type != ICBTAG_FLAG_AD_SHORT) {
 871                 udf_warn(sb, "metadata inode efe does not have short allocation descriptors!\n");
 872                 iput(metadata_fe);
 873                 return ERR_PTR(-EIO);
 874         }
 875
 876         return metadata_fe;
 877 }
 878
 879 static int udf_load_metadata_files(struct super_block *sb, int partition,
 880                                    int type1_index)
 881 {
 882         struct udf_sb_info *sbi = UDF_SB(sb);
 883         struct udf_part_map *map;
 884         struct udf_meta_data *mdata;
 885         struct kernel_lb_addr addr;
 886         struct inode *fe;
 887
 888         map = &sbi->s_partmaps[partition];
 889         mdata = &map->s_type_specific.s_metadata;
 890         mdata->s_phys_partition_ref = type1_index;
 891
 892         /* metadata address */
 893         udf_debug("Metadata file location: block = %u part = %u\n",
 894                   mdata->s_meta_file_loc, mdata->s_phys_partition_ref);
 895
 896         fe = udf_find_metadata_inode_efe(sb, mdata->s_meta_file_loc,
 897                                          mdata->s_phys_partition_ref);
 898         if (IS_ERR(fe)) {
 899                 /* mirror file entry */
 900                 udf_debug("Mirror metadata file location: block = %u part = %u\n",
 901                           mdata->s_mirror_file_loc, mdata->s_phys_partition_ref);
 902
 903                 fe = udf_find_metadata_inode_efe(sb, mdata->s_mirror_file_loc,
 904                                                  mdata->s_phys_partition_ref);
 905
 906                 if (IS_ERR(fe)) {
 907                         udf_err(sb, "Both metadata and mirror metadata inode efe can not found\n");
 908                         return PTR_ERR(fe);
 909                 }
 910                 mdata->s_mirror_fe = fe;
 911         } else
 912                 mdata->s_metadata_fe = fe;
 913
 914
 915         /*
 916          * bitmap file entry
 917          * Note:
 918          * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
 919         */
 920         if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
 921                 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
 922                 addr.partitionReferenceNum = mdata->s_phys_partition_ref;
 923
 924                 udf_debug("Bitmap file location: block = %u part = %u\n",
 925                           addr.logicalBlockNum, addr.partitionReferenceNum);
 926
 927                 fe = udf_iget_special(sb, &addr);
 928                 if (IS_ERR(fe)) {
 929                         if (sb_rdonly(sb))
 930                                 udf_warn(sb, "bitmap inode efe not found but it's ok since the disc is mounted read-only\n");
 931                         else {
 932                                 udf_err(sb, "bitmap inode efe not found and attempted read-write mount\n");
 933                                 return PTR_ERR(fe);
 934                         }
 935                 } else
 936                         mdata->s_bitmap_fe = fe;
 937         }
 938
 939         udf_debug("udf_load_metadata_files Ok\n");
 940         return 0;
 941 }
 942
 943 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
 944                              struct kernel_lb_addr *root)
 945 {
 946         struct fileSetDesc *fset;
 947
 948         fset = (struct fileSetDesc *)bh->b_data;
 949
 950         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
 951
 952         UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
 953
 954         udf_debug("Rootdir at block=%u, partition=%u\n",
 955                   root->logicalBlockNum, root->partitionReferenceNum);
 956 }
 957
 958 int udf_compute_nr_groups(struct super_block *sb, u32 partition)
 959 {
 960         struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
 961         return DIV_ROUND_UP(map->s_partition_len +
 962                             (sizeof(struct spaceBitmapDesc) << 3),
 963                             sb->s_blocksize * 8);
 964 }
 965
 966 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
 967 {
 968         struct udf_bitmap *bitmap;
 969         int nr_groups;
 970         int size;
 971
 972         nr_groups = udf_compute_nr_groups(sb, index);
 973         size = sizeof(struct udf_bitmap) +
 974                 (sizeof(struct buffer_head *) * nr_groups);
 975
 976         if (size <= PAGE_SIZE)
 977                 bitmap = kzalloc(size, GFP_KERNEL);
 978         else
 979                 bitmap = vzalloc(size); /* TODO: get rid of vzalloc */
 980
 981         if (!bitmap)
 982                 return NULL;
 983
 984         bitmap->s_nr_groups = nr_groups;
 985         return bitmap;
 986 }
 987
 988 static int check_partition_desc(struct super_block *sb,
 989                                 struct partitionDesc *p,
 990                                 struct udf_part_map *map)
 991 {
 992         bool umap, utable, fmap, ftable;
 993         struct partitionHeaderDesc *phd;
 994
 995         switch (le32_to_cpu(p->accessType)) {
 996         case PD_ACCESS_TYPE_READ_ONLY:
 997         case PD_ACCESS_TYPE_WRITE_ONCE:
 998         case PD_ACCESS_TYPE_REWRITABLE:
 999         case PD_ACCESS_TYPE_NONE:
1000                 goto force_ro;
1001         }
1002
1003         /* No Partition Header Descriptor? */
1004         if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1005             strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
1006                 goto force_ro;
1007
1008         phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1009         utable = phd->unallocSpaceTable.extLength;
1010         umap = phd->unallocSpaceBitmap.extLength;
1011         ftable = phd->freedSpaceTable.extLength;
1012         fmap = phd->freedSpaceBitmap.extLength;
1013
1014         /* No allocation info? */
1015         if (!utable && !umap && !ftable && !fmap)
1016                 goto force_ro;
1017
1018         /* We don't support blocks that require erasing before overwrite */
1019         if (ftable || fmap)
1020                 goto force_ro;
1021         /* UDF 2.60: 2.3.3 - no mixing of tables & bitmaps, no VAT. */
1022         if (utable && umap)
1023                 goto force_ro;
1024
1025         if (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1026             map->s_partition_type == UDF_VIRTUAL_MAP20)
1027                 goto force_ro;
1028
1029         return 0;
1030 force_ro:
1031         if (!sb_rdonly(sb))
1032                 return -EACCES;
1033         UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT);
1034         return 0;
1035 }
1036
1037 static int udf_fill_partdesc_info(struct super_block *sb,
1038                 struct partitionDesc *p, int p_index)
1039 {
1040         struct udf_part_map *map;
1041         struct udf_sb_info *sbi = UDF_SB(sb);
1042         struct partitionHeaderDesc *phd;
1043         int err;
1044
1045         map = &sbi->s_partmaps[p_index];
1046
1047         map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
1048         map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
1049
1050         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
1051                 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
1052         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
1053                 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
1054         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
1055                 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
1056         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
1057                 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
1058
1059         udf_debug("Partition (%d type %x) starts at physical %u, block length %u\n",
1060                   p_index, map->s_partition_type,
1061                   map->s_partition_root, map->s_partition_len);
1062
1063         err = check_partition_desc(sb, p, map);
1064         if (err)
1065                 return err;
1066
1067         /*
1068          * Skip loading allocation info it we cannot ever write to the fs.
1069          * This is a correctness thing as we may have decided to force ro mount
1070          * to avoid allocation info we don't support.
1071          */
1072         if (UDF_QUERY_FLAG(sb, UDF_FLAG_RW_INCOMPAT))
1073                 return 0;
1074
1075         phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1076         if (phd->unallocSpaceTable.extLength) {
1077                 struct kernel_lb_addr loc = {
1078                         .logicalBlockNum = le32_to_cpu(
1079                                 phd->unallocSpaceTable.extPosition),
1080                         .partitionReferenceNum = p_index,
1081                 };
1082                 struct inode *inode;
1083
1084                 inode = udf_iget_special(sb, &loc);
1085                 if (IS_ERR(inode)) {
1086                         udf_debug("cannot load unallocSpaceTable (part %d)\n",
1087                                   p_index);
1088                         return PTR_ERR(inode);
1089                 }
1090                 map->s_uspace.s_table = inode;
1091                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1092                 udf_debug("unallocSpaceTable (part %d) @ %lu\n",
1093                           p_index, map->s_uspace.s_table->i_ino);
1094         }
1095
1096         if (phd->unallocSpaceBitmap.extLength) {
1097                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1098                 if (!bitmap)
1099                         return -ENOMEM;
1100                 map->s_uspace.s_bitmap = bitmap;
1101                 bitmap->s_extPosition = le32_to_cpu(
1102                                 phd->unallocSpaceBitmap.extPosition);
1103                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1104                 udf_debug("unallocSpaceBitmap (part %d) @ %u\n",
1105                           p_index, bitmap->s_extPosition);
1106         }
1107
1108         return 0;
1109 }
1110
1111 static void udf_find_vat_block(struct super_block *sb, int p_index,
1112                                int type1_index, sector_t start_block)
1113 {
1114         struct udf_sb_info *sbi = UDF_SB(sb);
1115         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1116         sector_t vat_block;
1117         struct kernel_lb_addr ino;
1118         struct inode *inode;
1119
1120         /*
1121          * VAT file entry is in the last recorded block. Some broken disks have
1122          * it a few blocks before so try a bit harder...
1123          */
1124         ino.partitionReferenceNum = type1_index;
1125         for (vat_block = start_block;
1126              vat_block >= map->s_partition_root &&
1127              vat_block >= start_block - 3; vat_block--) {
1128                 ino.logicalBlockNum = vat_block - map->s_partition_root;
1129                 inode = udf_iget_special(sb, &ino);
1130                 if (!IS_ERR(inode)) {
1131                         sbi->s_vat_inode = inode;
1132                         break;
1133                 }
1134         }
1135 }
1136
1137 static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1138 {
1139         struct udf_sb_info *sbi = UDF_SB(sb);
1140         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1141         struct buffer_head *bh = NULL;
1142         struct udf_inode_info *vati;
1143         uint32_t pos;
1144         struct virtualAllocationTable20 *vat20;
1145         sector_t blocks = i_size_read(sb->s_bdev->bd_inode) >>
1146                           sb->s_blocksize_bits;
1147
1148         udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block);
1149         if (!sbi->s_vat_inode &&
1150             sbi->s_last_block != blocks - 1) {
1151                 pr_notice("Failed to read VAT inode from the last recorded block (%lu), retrying with the last block of the device (%lu).\n",
1152                           (unsigned long)sbi->s_last_block,
1153                           (unsigned long)blocks - 1);
1154                 udf_find_vat_block(sb, p_index, type1_index, blocks - 1);
1155         }
1156         if (!sbi->s_vat_inode)
1157                 return -EIO;
1158
1159         if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1160                 map->s_type_specific.s_virtual.s_start_offset = 0;
1161                 map->s_type_specific.s_virtual.s_num_entries =
1162                         (sbi->s_vat_inode->i_size - 36) >> 2;
1163         } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1164                 vati = UDF_I(sbi->s_vat_inode);
1165                 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1166                         pos = udf_block_map(sbi->s_vat_inode, 0);
1167                         bh = sb_bread(sb, pos);
1168                         if (!bh)
1169                                 return -EIO;
1170                         vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1171                 } else {
1172                         vat20 = (struct virtualAllocationTable20 *)
1173                                                         vati->i_ext.i_data;
1174                 }
1175
1176                 map->s_type_specific.s_virtual.s_start_offset =
1177                         le16_to_cpu(vat20->lengthHeader);
1178                 map->s_type_specific.s_virtual.s_num_entries =
1179                         (sbi->s_vat_inode->i_size -
1180                                 map->s_type_specific.s_virtual.
1181                                         s_start_offset) >> 2;
1182                 brelse(bh);
1183         }
1184         return 0;
1185 }
1186
1187 /*
1188  * Load partition descriptor block
1189  *
1190  * Returns <0 on error, 0 on success, -EAGAIN is special - try next descriptor
1191  * sequence.
1192  */
1193 static int udf_load_partdesc(struct super_block *sb, sector_t block)
1194 {
1195         struct buffer_head *bh;
1196         struct partitionDesc *p;
1197         struct udf_part_map *map;
1198         struct udf_sb_info *sbi = UDF_SB(sb);
1199         int i, type1_idx;
1200         uint16_t partitionNumber;
1201         uint16_t ident;
1202         int ret;
1203
1204         bh = udf_read_tagged(sb, block, block, &ident);
1205         if (!bh)
1206                 return -EAGAIN;
1207         if (ident != TAG_IDENT_PD) {
1208                 ret = 0;
1209                 goto out_bh;
1210         }
1211
1212         p = (struct partitionDesc *)bh->b_data;
1213         partitionNumber = le16_to_cpu(p->partitionNumber);
1214
1215         /* First scan for TYPE1 and SPARABLE partitions */
1216         for (i = 0; i < sbi->s_partitions; i++) {
1217                 map = &sbi->s_partmaps[i];
1218                 udf_debug("Searching map: (%u == %u)\n",
1219                           map->s_partition_num, partitionNumber);
1220                 if (map->s_partition_num == partitionNumber &&
1221                     (map->s_partition_type == UDF_TYPE1_MAP15 ||
1222                      map->s_partition_type == UDF_SPARABLE_MAP15))
1223                         break;
1224         }
1225
1226         if (i >= sbi->s_partitions) {
1227                 udf_debug("Partition (%u) not found in partition map\n",
1228                           partitionNumber);
1229                 ret = 0;
1230                 goto out_bh;
1231         }
1232
1233         ret = udf_fill_partdesc_info(sb, p, i);
1234         if (ret < 0)
1235                 goto out_bh;
1236
1237         /*
1238          * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1239          * PHYSICAL partitions are already set up
1240          */
1241         type1_idx = i;
1242 #ifdef UDFFS_DEBUG
1243         map = NULL; /* supress 'maybe used uninitialized' warning */
1244 #endif
1245         for (i = 0; i < sbi->s_partitions; i++) {
1246                 map = &sbi->s_partmaps[i];
1247
1248                 if (map->s_partition_num == partitionNumber &&
1249                     (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1250                      map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1251                      map->s_partition_type == UDF_METADATA_MAP25))
1252                         break;
1253         }
1254
1255         if (i >= sbi->s_partitions) {
1256                 ret = 0;
1257                 goto out_bh;
1258         }
1259
1260         ret = udf_fill_partdesc_info(sb, p, i);
1261         if (ret < 0)
1262                 goto out_bh;
1263
1264         if (map->s_partition_type == UDF_METADATA_MAP25) {
1265                 ret = udf_load_metadata_files(sb, i, type1_idx);
1266                 if (ret < 0) {
1267                         udf_err(sb, "error loading MetaData partition map %d\n",
1268                                 i);
1269                         goto out_bh;
1270                 }
1271         } else {
1272                 /*
1273                  * If we have a partition with virtual map, we don't handle
1274                  * writing to it (we overwrite blocks instead of relocating
1275                  * them).
1276                  */
1277                 if (!sb_rdonly(sb)) {
1278                         ret = -EACCES;
1279                         goto out_bh;
1280                 }
1281                 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT);
1282                 ret = udf_load_vat(sb, i, type1_idx);
1283                 if (ret < 0)
1284                         goto out_bh;
1285         }
1286         ret = 0;
1287 out_bh:
1288         /* In case loading failed, we handle cleanup in udf_fill_super */
1289         brelse(bh);
1290         return ret;
1291 }
1292
1293 static int udf_load_sparable_map(struct super_block *sb,
1294                                  struct udf_part_map *map,
1295                                  struct sparablePartitionMap *spm)
1296 {
1297         uint32_t loc;
1298         uint16_t ident;
1299         struct sparingTable *st;
1300         struct udf_sparing_data *sdata = &map->s_type_specific.s_sparing;
1301         int i;
1302         struct buffer_head *bh;
1303
1304         map->s_partition_type = UDF_SPARABLE_MAP15;
1305         sdata->s_packet_len = le16_to_cpu(spm->packetLength);
1306         if (!is_power_of_2(sdata->s_packet_len)) {
1307                 udf_err(sb, "error loading logical volume descriptor: "
1308                         "Invalid packet length %u\n",
1309                         (unsigned)sdata->s_packet_len);
1310                 return -EIO;
1311         }
1312         if (spm->numSparingTables > 4) {
1313                 udf_err(sb, "error loading logical volume descriptor: "
1314                         "Too many sparing tables (%d)\n",
1315                         (int)spm->numSparingTables);
1316                 return -EIO;
1317         }
1318
1319         for (i = 0; i < spm->numSparingTables; i++) {
1320                 loc = le32_to_cpu(spm->locSparingTable[i]);
1321                 bh = udf_read_tagged(sb, loc, loc, &ident);
1322                 if (!bh)
1323                         continue;
1324
1325                 st = (struct sparingTable *)bh->b_data;
1326                 if (ident != 0 ||
1327                     strncmp(st->sparingIdent.ident, UDF_ID_SPARING,
1328                             strlen(UDF_ID_SPARING)) ||
1329                     sizeof(*st) + le16_to_cpu(st->reallocationTableLen) >
1330                                                         sb->s_blocksize) {
1331                         brelse(bh);
1332                         continue;
1333                 }
1334
1335                 sdata->s_spar_map[i] = bh;
1336         }
1337         map->s_partition_func = udf_get_pblock_spar15;
1338         return 0;
1339 }
1340
1341 static int udf_load_logicalvol(struct super_block *sb, sector_t block,
1342                                struct kernel_lb_addr *fileset)
1343 {
1344         struct logicalVolDesc *lvd;
1345         int i, offset;
1346         uint8_t type;
1347         struct udf_sb_info *sbi = UDF_SB(sb);
1348         struct genericPartitionMap *gpm;
1349         uint16_t ident;
1350         struct buffer_head *bh;
1351         unsigned int table_len;
1352         int ret;
1353
1354         bh = udf_read_tagged(sb, block, block, &ident);
1355         if (!bh)
1356                 return -EAGAIN;
1357         BUG_ON(ident != TAG_IDENT_LVD);
1358         lvd = (struct logicalVolDesc *)bh->b_data;
1359         table_len = le32_to_cpu(lvd->mapTableLength);
1360         if (table_len > sb->s_blocksize - sizeof(*lvd)) {
1361                 udf_err(sb, "error loading logical volume descriptor: "
1362                         "Partition table too long (%u > %lu)\n", table_len,
1363                         sb->s_blocksize - sizeof(*lvd));
1364                 ret = -EIO;
1365                 goto out_bh;
1366         }
1367
1368         ret = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1369         if (ret)
1370                 goto out_bh;
1371
1372         for (i = 0, offset = 0;
1373              i < sbi->s_partitions && offset < table_len;
1374              i++, offset += gpm->partitionMapLength) {
1375                 struct udf_part_map *map = &sbi->s_partmaps[i];
1376                 gpm = (struct genericPartitionMap *)
1377                                 &(lvd->partitionMaps[offset]);
1378                 type = gpm->partitionMapType;
1379                 if (type == 1) {
1380                         struct genericPartitionMap1 *gpm1 =
1381                                 (struct genericPartitionMap1 *)gpm;
1382                         map->s_partition_type = UDF_TYPE1_MAP15;
1383                         map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1384                         map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1385                         map->s_partition_func = NULL;
1386                 } else if (type == 2) {
1387                         struct udfPartitionMap2 *upm2 =
1388                                                 (struct udfPartitionMap2 *)gpm;
1389                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1390                                                 strlen(UDF_ID_VIRTUAL))) {
1391                                 u16 suf =
1392                                         le16_to_cpu(((__le16 *)upm2->partIdent.
1393                                                         identSuffix)[0]);
1394                                 if (suf < 0x0200) {
1395                                         map->s_partition_type =
1396                                                         UDF_VIRTUAL_MAP15;
1397                                         map->s_partition_func =
1398                                                         udf_get_pblock_virt15;
1399                                 } else {
1400                                         map->s_partition_type =
1401                                                         UDF_VIRTUAL_MAP20;
1402                                         map->s_partition_func =
1403                                                         udf_get_pblock_virt20;
1404                                 }
1405                         } else if (!strncmp(upm2->partIdent.ident,
1406                                                 UDF_ID_SPARABLE,
1407                                                 strlen(UDF_ID_SPARABLE))) {
1408                                 ret = udf_load_sparable_map(sb, map,
1409                                         (struct sparablePartitionMap *)gpm);
1410                                 if (ret < 0)
1411                                         goto out_bh;
1412                         } else if (!strncmp(upm2->partIdent.ident,
1413                                                 UDF_ID_METADATA,
1414                                                 strlen(UDF_ID_METADATA))) {
1415                                 struct udf_meta_data *mdata =
1416                                         &map->s_type_specific.s_metadata;
1417                                 struct metadataPartitionMap *mdm =
1418                                                 (struct metadataPartitionMap *)
1419                                                 &(lvd->partitionMaps[offset]);
1420                                 udf_debug("Parsing Logical vol part %d type %u  id=%s\n",
1421                                           i, type, UDF_ID_METADATA);
1422
1423                                 map->s_partition_type = UDF_METADATA_MAP25;
1424                                 map->s_partition_func = udf_get_pblock_meta25;
1425
1426                                 mdata->s_meta_file_loc   =
1427                                         le32_to_cpu(mdm->metadataFileLoc);
1428                                 mdata->s_mirror_file_loc =
1429                                         le32_to_cpu(mdm->metadataMirrorFileLoc);
1430                                 mdata->s_bitmap_file_loc =
1431                                         le32_to_cpu(mdm->metadataBitmapFileLoc);
1432                                 mdata->s_alloc_unit_size =
1433                                         le32_to_cpu(mdm->allocUnitSize);
1434                                 mdata->s_align_unit_size =
1435                                         le16_to_cpu(mdm->alignUnitSize);
1436                                 if (mdm->flags & 0x01)
1437                                         mdata->s_flags |= MF_DUPLICATE_MD;
1438
1439                                 udf_debug("Metadata Ident suffix=0x%x\n",
1440                                           le16_to_cpu(*(__le16 *)
1441                                                       mdm->partIdent.identSuffix));
1442                                 udf_debug("Metadata part num=%u\n",
1443                                           le16_to_cpu(mdm->partitionNum));
1444                                 udf_debug("Metadata part alloc unit size=%u\n",
1445                                           le32_to_cpu(mdm->allocUnitSize));
1446                                 udf_debug("Metadata file loc=%u\n",
1447                                           le32_to_cpu(mdm->metadataFileLoc));
1448                                 udf_debug("Mirror file loc=%u\n",
1449                                           le32_to_cpu(mdm->metadataMirrorFileLoc));
1450                                 udf_debug("Bitmap file loc=%u\n",
1451                                           le32_to_cpu(mdm->metadataBitmapFileLoc));
1452                                 udf_debug("Flags: %d %u\n",
1453                                           mdata->s_flags, mdm->flags);
1454                         } else {
1455                                 udf_debug("Unknown ident: %s\n",
1456                                           upm2->partIdent.ident);
1457                                 continue;
1458                         }
1459                         map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1460                         map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1461                 }
1462                 udf_debug("Partition (%d:%u) type %u on volume %u\n",
1463                           i, map->s_partition_num, type, map->s_volumeseqnum);
1464         }
1465
1466         if (fileset) {
1467                 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
1468
1469                 *fileset = lelb_to_cpu(la->extLocation);
1470                 udf_debug("FileSet found in LogicalVolDesc at block=%u, partition=%u\n",
1471                           fileset->logicalBlockNum,
1472                           fileset->partitionReferenceNum);
1473         }
1474         if (lvd->integritySeqExt.extLength)
1475                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1476         ret = 0;
1477 out_bh:
1478         brelse(bh);
1479         return ret;
1480 }
1481
1482 /*
1483  * Find the prevailing Logical Volume Integrity Descriptor.
1484  */
1485 static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
1486 {
1487         struct buffer_head *bh, *final_bh;
1488         uint16_t ident;
1489         struct udf_sb_info *sbi = UDF_SB(sb);
1490         struct logicalVolIntegrityDesc *lvid;
1491         int indirections = 0;
1492
1493         while (++indirections <= UDF_MAX_LVID_NESTING) {
1494                 final_bh = NULL;
1495                 while (loc.extLength > 0 &&
1496                         (bh = udf_read_tagged(sb, loc.extLocation,
1497                                         loc.extLocation, &ident))) {
1498                         if (ident != TAG_IDENT_LVID) {
1499                                 brelse(bh);
1500                                 break;
1501                         }
1502
1503                         brelse(final_bh);
1504                         final_bh = bh;
1505
1506                         loc.extLength -= sb->s_blocksize;
1507                         loc.extLocation++;
1508                 }
1509
1510                 if (!final_bh)
1511                         return;
1512
1513                 brelse(sbi->s_lvid_bh);
1514                 sbi->s_lvid_bh = final_bh;
1515
1516                 lvid = (struct logicalVolIntegrityDesc *)final_bh->b_data;
1517                 if (lvid->nextIntegrityExt.extLength == 0)
1518                         return;
1519
1520                 loc = leea_to_cpu(lvid->nextIntegrityExt);
1521         }
1522
1523         udf_warn(sb, "Too many LVID indirections (max %u), ignoring.\n",
1524                 UDF_MAX_LVID_NESTING);
1525         brelse(sbi->s_lvid_bh);
1526         sbi->s_lvid_bh = NULL;
1527 }
1528
1529 /*
1530  * Step for reallocation of table of partition descriptor sequence numbers.
1531  * Must be power of 2.
1532  */
1533 #define PART_DESC_ALLOC_STEP 32
1534
1535 struct part_desc_seq_scan_data {
1536         struct udf_vds_record rec;
1537         u32 partnum;
1538 };
1539
1540 struct desc_seq_scan_data {
1541         struct udf_vds_record vds[VDS_POS_LENGTH];
1542         unsigned int size_part_descs;
1543         unsigned int num_part_descs;
1544         struct part_desc_seq_scan_data *part_descs_loc;
1545 };
1546
1547 static struct udf_vds_record *handle_partition_descriptor(
1548                                 struct buffer_head *bh,
1549                                 struct desc_seq_scan_data *data)
1550 {
1551         struct partitionDesc *desc = (struct partitionDesc *)bh->b_data;
1552         int partnum;
1553         int i;
1554
1555         partnum = le16_to_cpu(desc->partitionNumber);
1556         for (i = 0; i < data->num_part_descs; i++)
1557                 if (partnum == data->part_descs_loc[i].partnum)
1558                         return &(data->part_descs_loc[i].rec);
1559         if (data->num_part_descs >= data->size_part_descs) {
1560                 struct part_desc_seq_scan_data *new_loc;
1561                 unsigned int new_size = ALIGN(partnum, PART_DESC_ALLOC_STEP);
1562
1563                 new_loc = kcalloc(new_size, sizeof(*new_loc), GFP_KERNEL);
1564                 if (!new_loc)
1565                         return ERR_PTR(-ENOMEM);
1566                 memcpy(new_loc, data->part_descs_loc,
1567                        data->size_part_descs * sizeof(*new_loc));
1568                 kfree(data->part_descs_loc);
1569                 data->part_descs_loc = new_loc;
1570                 data->size_part_descs = new_size;
1571         }
1572         return &(data->part_descs_loc[data->num_part_descs++].rec);
1573 }
1574
1575
1576 static struct udf_vds_record *get_volume_descriptor_record(uint16_t ident,
1577                 struct buffer_head *bh, struct desc_seq_scan_data *data)
1578 {
1579         switch (ident) {
1580         case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1581                 return &(data->vds[VDS_POS_PRIMARY_VOL_DESC]);
1582         case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1583                 return &(data->vds[VDS_POS_IMP_USE_VOL_DESC]);
1584         case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1585                 return &(data->vds[VDS_POS_LOGICAL_VOL_DESC]);
1586         case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1587                 return &(data->vds[VDS_POS_UNALLOC_SPACE_DESC]);
1588         case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1589                 return handle_partition_descriptor(bh, data);
1590         }
1591         return NULL;
1592 }
1593
1594 /*
1595  * Process a main/reserve volume descriptor sequence.
1596  *   @block             First block of first extent of the sequence.
1597  *   @lastblock         Lastblock of first extent of the sequence.
1598  *   @fileset           There we store extent containing root fileset
1599  *
1600  * Returns <0 on error, 0 on success. -EAGAIN is special - try next descriptor
1601  * sequence
1602  */
1603 static noinline int udf_process_sequence(
1604                 struct super_block *sb,
1605                 sector_t block, sector_t lastblock,
1606                 struct kernel_lb_addr *fileset)
1607 {
1608         struct buffer_head *bh = NULL;
1609         struct udf_vds_record *curr;
1610         struct generic_desc *gd;
1611         struct volDescPtr *vdp;
1612         bool done = false;
1613         uint32_t vdsn;
1614         uint16_t ident;
1615         int ret;
1616         unsigned int indirections = 0;
1617         struct desc_seq_scan_data data;
1618         unsigned int i;
1619
1620         memset(data.vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1621         data.size_part_descs = PART_DESC_ALLOC_STEP;
1622         data.num_part_descs = 0;
1623         data.part_descs_loc = kcalloc(data.size_part_descs,
1624                                       sizeof(*data.part_descs_loc),
1625                                       GFP_KERNEL);
1626         if (!data.part_descs_loc)
1627                 return -ENOMEM;
1628
1629         /*
1630          * Read the main descriptor sequence and find which descriptors
1631          * are in it.
1632          */
1633         for (; (!done && block <= lastblock); block++) {
1634                 bh = udf_read_tagged(sb, block, block, &ident);
1635                 if (!bh)
1636                         break;
1637
1638                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1639                 gd = (struct generic_desc *)bh->b_data;
1640                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1641                 switch (ident) {
1642                 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1643                         if (++indirections > UDF_MAX_TD_NESTING) {
1644                                 udf_err(sb, "too many Volume Descriptor "
1645                                         "Pointers (max %u supported)\n",
1646                                         UDF_MAX_TD_NESTING);
1647                                 brelse(bh);
1648                                 return -EIO;
1649                         }
1650
1651                         vdp = (struct volDescPtr *)bh->b_data;
1652                         block = le32_to_cpu(vdp->nextVolDescSeqExt.extLocation);
1653                         lastblock = le32_to_cpu(
1654                                 vdp->nextVolDescSeqExt.extLength) >>
1655                                 sb->s_blocksize_bits;
1656                         lastblock += block - 1;
1657                         /* For loop is going to increment 'block' again */
1658                         block--;
1659                         break;
1660                 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1661                 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1662                 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1663                 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1664                 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1665                         curr = get_volume_descriptor_record(ident, bh, &data);
1666                         if (IS_ERR(curr)) {
1667                                 brelse(bh);
1668                                 return PTR_ERR(curr);
1669                         }
1670                         /* Descriptor we don't care about? */
1671                         if (!curr)
1672                                 break;
1673                         if (vdsn >= curr->volDescSeqNum) {
1674                                 curr->volDescSeqNum = vdsn;
1675                                 curr->block = block;
1676                         }
1677                         break;
1678                 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1679                         done = true;
1680                         break;
1681                 }
1682                 brelse(bh);
1683         }
1684         /*
1685          * Now read interesting descriptors again and process them
1686          * in a suitable order
1687          */
1688         if (!data.vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1689                 udf_err(sb, "Primary Volume Descriptor not found!\n");
1690                 return -EAGAIN;
1691         }
1692         ret = udf_load_pvoldesc(sb, data.vds[VDS_POS_PRIMARY_VOL_DESC].block);
1693         if (ret < 0)
1694                 return ret;
1695
1696         if (data.vds[VDS_POS_LOGICAL_VOL_DESC].block) {
1697                 ret = udf_load_logicalvol(sb,
1698                                 data.vds[VDS_POS_LOGICAL_VOL_DESC].block,
1699                                 fileset);
1700                 if (ret < 0)
1701                         return ret;
1702         }
1703
1704         /* Now handle prevailing Partition Descriptors */
1705         for (i = 0; i < data.num_part_descs; i++) {
1706                 ret = udf_load_partdesc(sb, data.part_descs_loc[i].rec.block);
1707                 if (ret < 0)
1708                         return ret;
1709         }
1710
1711         return 0;
1712 }
1713
1714 /*
1715  * Load Volume Descriptor Sequence described by anchor in bh
1716  *
1717  * Returns <0 on error, 0 on success
1718  */
1719 static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh,
1720                              struct kernel_lb_addr *fileset)
1721 {
1722         struct anchorVolDescPtr *anchor;
1723         sector_t main_s, main_e, reserve_s, reserve_e;
1724         int ret;
1725
1726         anchor = (struct anchorVolDescPtr *)bh->b_data;
1727
1728         /* Locate the main sequence */
1729         main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1730         main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1731         main_e = main_e >> sb->s_blocksize_bits;
1732         main_e += main_s - 1;
1733
1734         /* Locate the reserve sequence */
1735         reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1736         reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1737         reserve_e = reserve_e >> sb->s_blocksize_bits;
1738         reserve_e += reserve_s - 1;
1739
1740         /* Process the main & reserve sequences */
1741         /* responsible for finding the PartitionDesc(s) */
1742         ret = udf_process_sequence(sb, main_s, main_e, fileset);
1743         if (ret != -EAGAIN)
1744                 return ret;
1745         udf_sb_free_partitions(sb);
1746         ret = udf_process_sequence(sb, reserve_s, reserve_e, fileset);
1747         if (ret < 0) {
1748                 udf_sb_free_partitions(sb);
1749                 /* No sequence was OK, return -EIO */
1750                 if (ret == -EAGAIN)
1751                         ret = -EIO;
1752         }
1753         return ret;
1754 }
1755
1756 /*
1757  * Check whether there is an anchor block in the given block and
1758  * load Volume Descriptor Sequence if so.
1759  *
1760  * Returns <0 on error, 0 on success, -EAGAIN is special - try next anchor
1761  * block
1762  */
1763 static int udf_check_anchor_block(struct super_block *sb, sector_t block,
1764                                   struct kernel_lb_addr *fileset)
1765 {
1766         struct buffer_head *bh;
1767         uint16_t ident;
1768         int ret;
1769
1770         if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
1771             udf_fixed_to_variable(block) >=
1772             i_size_read(sb->s_bdev->bd_inode) >> sb->s_blocksize_bits)
1773                 return -EAGAIN;
1774
1775         bh = udf_read_tagged(sb, block, block, &ident);
1776         if (!bh)
1777                 return -EAGAIN;
1778         if (ident != TAG_IDENT_AVDP) {
1779                 brelse(bh);
1780                 return -EAGAIN;
1781         }
1782         ret = udf_load_sequence(sb, bh, fileset);
1783         brelse(bh);
1784         return ret;
1785 }
1786
1787 /*
1788  * Search for an anchor volume descriptor pointer.
1789  *
1790  * Returns < 0 on error, 0 on success. -EAGAIN is special - try next set
1791  * of anchors.
1792  */
1793 static int udf_scan_anchors(struct super_block *sb, sector_t *lastblock,
1794                             struct kernel_lb_addr *fileset)
1795 {
1796         sector_t last[6];
1797         int i;
1798         struct udf_sb_info *sbi = UDF_SB(sb);
1799         int last_count = 0;
1800         int ret;
1801
1802         /* First try user provided anchor */
1803         if (sbi->s_anchor) {
1804                 ret = udf_check_anchor_block(sb, sbi->s_anchor, fileset);
1805                 if (ret != -EAGAIN)
1806                         return ret;
1807         }
1808         /*
1809          * according to spec, anchor is in either:
1810          *     block 256
1811          *     lastblock-256
1812          *     lastblock
1813          *  however, if the disc isn't closed, it could be 512.
1814          */
1815         ret = udf_check_anchor_block(sb, sbi->s_session + 256, fileset);
1816         if (ret != -EAGAIN)
1817                 return ret;
1818         /*
1819          * The trouble is which block is the last one. Drives often misreport
1820          * this so we try various possibilities.
1821          */
1822         last[last_count++] = *lastblock;
1823         if (*lastblock >= 1)
1824                 last[last_count++] = *lastblock - 1;
1825         last[last_count++] = *lastblock + 1;
1826         if (*lastblock >= 2)
1827                 last[last_count++] = *lastblock - 2;
1828         if (*lastblock >= 150)
1829                 last[last_count++] = *lastblock - 150;
1830         if (*lastblock >= 152)
1831                 last[last_count++] = *lastblock - 152;
1832
1833         for (i = 0; i < last_count; i++) {
1834                 if (last[i] >= i_size_read(sb->s_bdev->bd_inode) >>
1835                                 sb->s_blocksize_bits)
1836                         continue;
1837                 ret = udf_check_anchor_block(sb, last[i], fileset);
1838                 if (ret != -EAGAIN) {
1839                         if (!ret)
1840                                 *lastblock = last[i];
1841                         return ret;
1842                 }
1843                 if (last[i] < 256)
1844                         continue;
1845                 ret = udf_check_anchor_block(sb, last[i] - 256, fileset);
1846                 if (ret != -EAGAIN) {
1847                         if (!ret)
1848                                 *lastblock = last[i];
1849                         return ret;
1850                 }
1851         }
1852
1853         /* Finally try block 512 in case media is open */
1854         return udf_check_anchor_block(sb, sbi->s_session + 512, fileset);
1855 }
1856
1857 /*
1858  * Find an anchor volume descriptor and load Volume Descriptor Sequence from
1859  * area specified by it. The function expects sbi->s_lastblock to be the last
1860  * block on the media.
1861  *
1862  * Return <0 on error, 0 if anchor found. -EAGAIN is special meaning anchor
1863  * was not found.
1864  */
1865 static int udf_find_anchor(struct super_block *sb,
1866                            struct kernel_lb_addr *fileset)
1867 {
1868         struct udf_sb_info *sbi = UDF_SB(sb);
1869         sector_t lastblock = sbi->s_last_block;
1870         int ret;
1871
1872         ret = udf_scan_anchors(sb, &lastblock, fileset);
1873         if (ret != -EAGAIN)
1874                 goto out;
1875
1876         /* No anchor found? Try VARCONV conversion of block numbers */
1877         UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
1878         lastblock = udf_variable_to_fixed(sbi->s_last_block);
1879         /* Firstly, we try to not convert number of the last block */
1880         ret = udf_scan_anchors(sb, &lastblock, fileset);
1881         if (ret != -EAGAIN)
1882                 goto out;
1883
1884         lastblock = sbi->s_last_block;
1885         /* Secondly, we try with converted number of the last block */
1886         ret = udf_scan_anchors(sb, &lastblock, fileset);
1887         if (ret < 0) {
1888                 /* VARCONV didn't help. Clear it. */
1889                 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
1890         }
1891 out:
1892         if (ret == 0)
1893                 sbi->s_last_block = lastblock;
1894         return ret;
1895 }
1896
1897 /*
1898  * Check Volume Structure Descriptor, find Anchor block and load Volume
1899  * Descriptor Sequence.
1900  *
1901  * Returns < 0 on error, 0 on success. -EAGAIN is special meaning anchor
1902  * block was not found.
1903  */
1904 static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
1905                         int silent, struct kernel_lb_addr *fileset)
1906 {
1907         struct udf_sb_info *sbi = UDF_SB(sb);
1908         loff_t nsr_off;
1909         int ret;
1910
1911         if (!sb_set_blocksize(sb, uopt->blocksize)) {
1912                 if (!silent)
1913                         udf_warn(sb, "Bad block size\n");
1914                 return -EINVAL;
1915         }
1916         sbi->s_last_block = uopt->lastblock;
1917         if (!uopt->novrs) {
1918                 /* Check that it is NSR02 compliant */
1919                 nsr_off = udf_check_vsd(sb);
1920                 if (!nsr_off) {
1921                         if (!silent)
1922                                 udf_warn(sb, "No VRS found\n");
1923                         return -EINVAL;
1924                 }
1925                 if (nsr_off == -1)
1926                         udf_debug("Failed to read sector at offset %d. "
1927                                   "Assuming open disc. Skipping validity "
1928                                   "check\n", VSD_FIRST_SECTOR_OFFSET);
1929                 if (!sbi->s_last_block)
1930                         sbi->s_last_block = udf_get_last_block(sb);
1931         } else {
1932                 udf_debug("Validity check skipped because of novrs option\n");
1933         }
1934
1935         /* Look for anchor block and load Volume Descriptor Sequence */
1936         sbi->s_anchor = uopt->anchor;
1937         ret = udf_find_anchor(sb, fileset);
1938         if (ret < 0) {
1939                 if (!silent && ret == -EAGAIN)
1940                         udf_warn(sb, "No anchor found\n");
1941                 return ret;
1942         }
1943         return 0;
1944 }
1945
1946 static void udf_open_lvid(struct super_block *sb)
1947 {
1948         struct udf_sb_info *sbi = UDF_SB(sb);
1949         struct buffer_head *bh = sbi->s_lvid_bh;
1950         struct logicalVolIntegrityDesc *lvid;
1951         struct logicalVolIntegrityDescImpUse *lvidiu;
1952         struct timespec64 ts;
1953
1954         if (!bh)
1955                 return;
1956         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1957         lvidiu = udf_sb_lvidiu(sb);
1958         if (!lvidiu)
1959                 return;
1960
1961         mutex_lock(&sbi->s_alloc_mutex);
1962         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1963         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1964         ktime_get_real_ts64(&ts);
1965         udf_time_to_disk_stamp(&lvid->recordingDateAndTime, ts);
1966         if (le32_to_cpu(lvid->integrityType) == LVID_INTEGRITY_TYPE_CLOSE)
1967                 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN);
1968         else
1969                 UDF_SET_FLAG(sb, UDF_FLAG_INCONSISTENT);
1970
1971         lvid->descTag.descCRC = cpu_to_le16(
1972                 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1973                         le16_to_cpu(lvid->descTag.descCRCLength)));
1974
1975         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1976         mark_buffer_dirty(bh);
1977         sbi->s_lvid_dirty = 0;
1978         mutex_unlock(&sbi->s_alloc_mutex);
1979         /* Make opening of filesystem visible on the media immediately */
1980         sync_dirty_buffer(bh);
1981 }
1982
1983 static void udf_close_lvid(struct super_block *sb)
1984 {
1985         struct udf_sb_info *sbi = UDF_SB(sb);
1986         struct buffer_head *bh = sbi->s_lvid_bh;
1987         struct logicalVolIntegrityDesc *lvid;
1988         struct logicalVolIntegrityDescImpUse *lvidiu;
1989         struct timespec64 ts;
1990
1991         if (!bh)
1992                 return;
1993         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1994         lvidiu = udf_sb_lvidiu(sb);
1995         if (!lvidiu)
1996                 return;
1997
1998         mutex_lock(&sbi->s_alloc_mutex);
1999         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
2000         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
2001         ktime_get_real_ts64(&ts);
2002         udf_time_to_disk_stamp(&lvid->recordingDateAndTime, ts);
2003         if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
2004                 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
2005         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
2006                 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
2007         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
2008                 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
2009         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_INCONSISTENT))
2010                 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
2011
2012         lvid->descTag.descCRC = cpu_to_le16(
2013                         crc_itu_t(0, (char *)lvid + sizeof(struct tag),
2014                                 le16_to_cpu(lvid->descTag.descCRCLength)));
2015
2016         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
2017         /*
2018          * We set buffer uptodate unconditionally here to avoid spurious
2019          * warnings from mark_buffer_dirty() when previous EIO has marked
2020          * the buffer as !uptodate
2021          */
2022         set_buffer_uptodate(bh);
2023         mark_buffer_dirty(bh);
2024         sbi->s_lvid_dirty = 0;
2025         mutex_unlock(&sbi->s_alloc_mutex);
2026         /* Make closing of filesystem visible on the media immediately */
2027         sync_dirty_buffer(bh);
2028 }
2029
2030 u64 lvid_get_unique_id(struct super_block *sb)
2031 {
2032         struct buffer_head *bh;
2033         struct udf_sb_info *sbi = UDF_SB(sb);
2034         struct logicalVolIntegrityDesc *lvid;
2035         struct logicalVolHeaderDesc *lvhd;
2036         u64 uniqueID;
2037         u64 ret;
2038
2039         bh = sbi->s_lvid_bh;
2040         if (!bh)
2041                 return 0;
2042
2043         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
2044         lvhd = (struct logicalVolHeaderDesc *)lvid->logicalVolContentsUse;
2045
2046         mutex_lock(&sbi->s_alloc_mutex);
2047         ret = uniqueID = le64_to_cpu(lvhd->uniqueID);
2048         if (!(++uniqueID & 0xFFFFFFFF))
2049                 uniqueID += 16;
2050         lvhd->uniqueID = cpu_to_le64(uniqueID);
2051         mutex_unlock(&sbi->s_alloc_mutex);
2052         mark_buffer_dirty(bh);
2053
2054         return ret;
2055 }
2056
2057 static int udf_fill_super(struct super_block *sb, void *options, int silent)
2058 {
2059         int ret = -EINVAL;
2060         struct inode *inode = NULL;
2061         struct udf_options uopt;
2062         struct kernel_lb_addr rootdir, fileset;
2063         struct udf_sb_info *sbi;
2064         bool lvid_open = false;
2065
2066         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
2067         /* By default we'll use overflow[ug]id when UDF inode [ug]id == -1 */
2068         uopt.uid = make_kuid(current_user_ns(), overflowuid);
2069         uopt.gid = make_kgid(current_user_ns(), overflowgid);
2070         uopt.umask = 0;
2071         uopt.fmode = UDF_INVALID_MODE;
2072         uopt.dmode = UDF_INVALID_MODE;
2073         uopt.nls_map = NULL;
2074
2075         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
2076         if (!sbi)
2077                 return -ENOMEM;
2078
2079         sb->s_fs_info = sbi;
2080
2081         mutex_init(&sbi->s_alloc_mutex);
2082
2083         if (!udf_parse_options((char *)options, &uopt, false))
2084                 goto parse_options_failure;
2085
2086         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
2087             uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
2088                 udf_err(sb, "utf8 cannot be combined with iocharset\n");
2089                 goto parse_options_failure;
2090         }
2091         if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
2092                 uopt.nls_map = load_nls_default();
2093                 if (!uopt.nls_map)
2094                         uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
2095                 else
2096                         udf_debug("Using default NLS map\n");
2097         }
2098         if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
2099                 uopt.flags |= (1 << UDF_FLAG_UTF8);
2100
2101         fileset.logicalBlockNum = 0xFFFFFFFF;
2102         fileset.partitionReferenceNum = 0xFFFF;
2103
2104         sbi->s_flags = uopt.flags;
2105         sbi->s_uid = uopt.uid;
2106         sbi->s_gid = uopt.gid;
2107         sbi->s_umask = uopt.umask;
2108         sbi->s_fmode = uopt.fmode;
2109         sbi->s_dmode = uopt.dmode;
2110         sbi->s_nls_map = uopt.nls_map;
2111         rwlock_init(&sbi->s_cred_lock);
2112
2113         if (uopt.session == 0xFFFFFFFF)
2114                 sbi->s_session = udf_get_last_session(sb);
2115         else
2116                 sbi->s_session = uopt.session;
2117
2118         udf_debug("Multi-session=%d\n", sbi->s_session);
2119
2120         /* Fill in the rest of the superblock */
2121         sb->s_op = &udf_sb_ops;
2122         sb->s_export_op = &udf_export_ops;
2123
2124         sb->s_magic = UDF_SUPER_MAGIC;
2125         sb->s_time_gran = 1000;
2126
2127         if (uopt.flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) {
2128                 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
2129         } else {
2130                 uopt.blocksize = bdev_logical_block_size(sb->s_bdev);
2131                 while (uopt.blocksize <= 4096) {
2132                         ret = udf_load_vrs(sb, &uopt, silent, &fileset);
2133                         if (ret < 0) {
2134                                 if (!silent && ret != -EACCES) {
2135                                         pr_notice("Scanning with blocksize %u failed\n",
2136                                                   uopt.blocksize);
2137                                 }
2138                                 brelse(sbi->s_lvid_bh);
2139                                 sbi->s_lvid_bh = NULL;
2140                                 /*
2141                                  * EACCES is special - we want to propagate to
2142                                  * upper layers that we cannot handle RW mount.
2143                                  */
2144                                 if (ret == -EACCES)
2145                                         break;
2146                         } else
2147                                 break;
2148
2149                         uopt.blocksize <<= 1;
2150                 }
2151         }
2152         if (ret < 0) {
2153                 if (ret == -EAGAIN) {
2154                         udf_warn(sb, "No partition found (1)\n");
2155                         ret = -EINVAL;
2156                 }
2157                 goto error_out;
2158         }
2159
2160         udf_debug("Lastblock=%u\n", sbi->s_last_block);
2161
2162         if (sbi->s_lvid_bh) {
2163                 struct logicalVolIntegrityDescImpUse *lvidiu =
2164                                                         udf_sb_lvidiu(sb);
2165                 uint16_t minUDFReadRev;
2166                 uint16_t minUDFWriteRev;
2167
2168                 if (!lvidiu) {
2169                         ret = -EINVAL;
2170                         goto error_out;
2171                 }
2172                 minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
2173                 minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
2174                 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
2175                         udf_err(sb, "minUDFReadRev=%x (max is %x)\n",
2176                                 minUDFReadRev,
2177                                 UDF_MAX_READ_VERSION);
2178                         ret = -EINVAL;
2179                         goto error_out;
2180                 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION) {
2181                         if (!sb_rdonly(sb)) {
2182                                 ret = -EACCES;
2183                                 goto error_out;
2184                         }
2185                         UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT);
2186                 }
2187
2188                 sbi->s_udfrev = minUDFWriteRev;
2189
2190                 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
2191                         UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
2192                 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
2193                         UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
2194         }
2195
2196         if (!sbi->s_partitions) {
2197                 udf_warn(sb, "No partition found (2)\n");
2198                 ret = -EINVAL;
2199                 goto error_out;
2200         }
2201
2202         if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
2203                         UDF_PART_FLAG_READ_ONLY) {
2204                 if (!sb_rdonly(sb)) {
2205                         ret = -EACCES;
2206                         goto error_out;
2207                 }
2208                 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT);
2209         }
2210
2211         if (udf_find_fileset(sb, &fileset, &rootdir)) {
2212                 udf_warn(sb, "No fileset found\n");
2213                 ret = -EINVAL;
2214                 goto error_out;
2215         }
2216
2217         if (!silent) {
2218                 struct timestamp ts;
2219                 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
2220                 udf_info("Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
2221                          sbi->s_volume_ident,
2222                          le16_to_cpu(ts.year), ts.month, ts.day,
2223                          ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
2224         }
2225         if (!sb_rdonly(sb)) {
2226                 udf_open_lvid(sb);
2227                 lvid_open = true;
2228         }
2229
2230         /* Assign the root inode */
2231         /* assign inodes by physical block number */
2232         /* perhaps it's not extensible enough, but for now ... */
2233         inode = udf_iget(sb, &rootdir);
2234         if (IS_ERR(inode)) {
2235                 udf_err(sb, "Error in udf_iget, block=%u, partition=%u\n",
2236                        rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
2237                 ret = PTR_ERR(inode);
2238                 goto error_out;
2239         }
2240
2241         /* Allocate a dentry for the root inode */
2242         sb->s_root = d_make_root(inode);
2243         if (!sb->s_root) {
2244                 udf_err(sb, "Couldn't allocate root dentry\n");
2245                 ret = -ENOMEM;
2246                 goto error_out;
2247         }
2248         sb->s_maxbytes = MAX_LFS_FILESIZE;
2249         sb->s_max_links = UDF_MAX_LINKS;
2250         return 0;
2251
2252 error_out:
2253         iput(sbi->s_vat_inode);
2254 parse_options_failure:
2255         if (uopt.nls_map)
2256                 unload_nls(uopt.nls_map);
2257         if (lvid_open)
2258                 udf_close_lvid(sb);
2259         brelse(sbi->s_lvid_bh);
2260         udf_sb_free_partitions(sb);
2261         kfree(sbi);
2262         sb->s_fs_info = NULL;
2263
2264         return ret;
2265 }
2266
2267 void _udf_err(struct super_block *sb, const char *function,
2268               const char *fmt, ...)
2269 {
2270         struct va_format vaf;
2271         va_list args;
2272
2273         va_start(args, fmt);
2274
2275         vaf.fmt = fmt;
2276         vaf.va = &args;
2277
2278         pr_err("error (device %s): %s: %pV", sb->s_id, function, &vaf);
2279
2280         va_end(args);
2281 }
2282
2283 void _udf_warn(struct super_block *sb, const char *function,
2284                const char *fmt, ...)
2285 {
2286         struct va_format vaf;
2287         va_list args;
2288
2289         va_start(args, fmt);
2290
2291         vaf.fmt = fmt;
2292         vaf.va = &args;
2293
2294         pr_warn("warning (device %s): %s: %pV", sb->s_id, function, &vaf);
2295
2296         va_end(args);
2297 }
2298
2299 static void udf_put_super(struct super_block *sb)
2300 {
2301         struct udf_sb_info *sbi;
2302
2303         sbi = UDF_SB(sb);
2304
2305         iput(sbi->s_vat_inode);
2306         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2307                 unload_nls(sbi->s_nls_map);
2308         if (!sb_rdonly(sb))
2309                 udf_close_lvid(sb);
2310         brelse(sbi->s_lvid_bh);
2311         udf_sb_free_partitions(sb);
2312         mutex_destroy(&sbi->s_alloc_mutex);
2313         kfree(sb->s_fs_info);
2314         sb->s_fs_info = NULL;
2315 }
2316
2317 static int udf_sync_fs(struct super_block *sb, int wait)
2318 {
2319         struct udf_sb_info *sbi = UDF_SB(sb);
2320
2321         mutex_lock(&sbi->s_alloc_mutex);
2322         if (sbi->s_lvid_dirty) {
2323                 /*
2324                  * Blockdevice will be synced later so we don't have to submit
2325                  * the buffer for IO
2326                  */
2327                 mark_buffer_dirty(sbi->s_lvid_bh);
2328                 sbi->s_lvid_dirty = 0;
2329         }
2330         mutex_unlock(&sbi->s_alloc_mutex);
2331
2332         return 0;
2333 }
2334
2335 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
2336 {
2337         struct super_block *sb = dentry->d_sb;
2338         struct udf_sb_info *sbi = UDF_SB(sb);
2339         struct logicalVolIntegrityDescImpUse *lvidiu;
2340         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
2341
2342         lvidiu = udf_sb_lvidiu(sb);
2343         buf->f_type = UDF_SUPER_MAGIC;
2344         buf->f_bsize = sb->s_blocksize;
2345         buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
2346         buf->f_bfree = udf_count_free(sb);
2347         buf->f_bavail = buf->f_bfree;
2348         buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2349                                           le32_to_cpu(lvidiu->numDirs)) : 0)
2350                         + buf->f_bfree;
2351         buf->f_ffree = buf->f_bfree;
2352         buf->f_namelen = UDF_NAME_LEN;
2353         buf->f_fsid.val[0] = (u32)id;
2354         buf->f_fsid.val[1] = (u32)(id >> 32);
2355
2356         return 0;
2357 }
2358
2359 static unsigned int udf_count_free_bitmap(struct super_block *sb,
2360                                           struct udf_bitmap *bitmap)
2361 {
2362         struct buffer_head *bh = NULL;
2363         unsigned int accum = 0;
2364         int index;
2365         udf_pblk_t block = 0, newblock;
2366         struct kernel_lb_addr loc;
2367         uint32_t bytes;
2368         uint8_t *ptr;
2369         uint16_t ident;
2370         struct spaceBitmapDesc *bm;
2371
2372         loc.logicalBlockNum = bitmap->s_extPosition;
2373         loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
2374         bh = udf_read_ptagged(sb, &loc, 0, &ident);
2375
2376         if (!bh) {
2377                 udf_err(sb, "udf_count_free failed\n");
2378                 goto out;
2379         } else if (ident != TAG_IDENT_SBD) {
2380                 brelse(bh);
2381                 udf_err(sb, "udf_count_free failed\n");
2382                 goto out;
2383         }
2384
2385         bm = (struct spaceBitmapDesc *)bh->b_data;
2386         bytes = le32_to_cpu(bm->numOfBytes);
2387         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2388         ptr = (uint8_t *)bh->b_data;
2389
2390         while (bytes > 0) {
2391                 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2392                 accum += bitmap_weight((const unsigned long *)(ptr + index),
2393                                         cur_bytes * 8);
2394                 bytes -= cur_bytes;
2395                 if (bytes) {
2396                         brelse(bh);
2397                         newblock = udf_get_lb_pblock(sb, &loc, ++block);
2398                         bh = udf_tread(sb, newblock);
2399                         if (!bh) {
2400                                 udf_debug("read failed\n");
2401                                 goto out;
2402                         }
2403                         index = 0;
2404                         ptr = (uint8_t *)bh->b_data;
2405                 }
2406         }
2407         brelse(bh);
2408 out:
2409         return accum;
2410 }
2411
2412 static unsigned int udf_count_free_table(struct super_block *sb,
2413                                          struct inode *table)
2414 {
2415         unsigned int accum = 0;
2416         uint32_t elen;
2417         struct kernel_lb_addr eloc;
2418         int8_t etype;
2419         struct extent_position epos;
2420
2421         mutex_lock(&UDF_SB(sb)->s_alloc_mutex);
2422         epos.block = UDF_I(table)->i_location;
2423         epos.offset = sizeof(struct unallocSpaceEntry);
2424         epos.bh = NULL;
2425
2426         while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2427                 accum += (elen >> table->i_sb->s_blocksize_bits);
2428
2429         brelse(epos.bh);
2430         mutex_unlock(&UDF_SB(sb)->s_alloc_mutex);
2431
2432         return accum;
2433 }
2434
2435 static unsigned int udf_count_free(struct super_block *sb)
2436 {
2437         unsigned int accum = 0;
2438         struct udf_sb_info *sbi;
2439         struct udf_part_map *map;
2440
2441         sbi = UDF_SB(sb);
2442         if (sbi->s_lvid_bh) {
2443                 struct logicalVolIntegrityDesc *lvid =
2444                         (struct logicalVolIntegrityDesc *)
2445                         sbi->s_lvid_bh->b_data;
2446                 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
2447                         accum = le32_to_cpu(
2448                                         lvid->freeSpaceTable[sbi->s_partition]);
2449                         if (accum == 0xFFFFFFFF)
2450                                 accum = 0;
2451                 }
2452         }
2453
2454         if (accum)
2455                 return accum;
2456
2457         map = &sbi->s_partmaps[sbi->s_partition];
2458         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2459                 accum += udf_count_free_bitmap(sb,
2460                                                map->s_uspace.s_bitmap);
2461         }
2462         if (accum)
2463                 return accum;
2464
2465         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2466                 accum += udf_count_free_table(sb,
2467                                               map->s_uspace.s_table);
2468         }
2469         return accum;
2470 }
2471
2472 MODULE_AUTHOR("Ben Fennema");
2473 MODULE_DESCRIPTION("Universal Disk Format Filesystem");
2474 MODULE_LICENSE("GPL");
2475 module_init(init_udf_fs)
2476 module_exit(exit_udf_fs)