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  *    https://www.ecma.ch/
  15  *    https://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 void udf_open_lvid(struct super_block *);
  96 static void udf_close_lvid(struct super_block *);
  97 static unsigned int udf_count_free(struct super_block *);
  98 static int udf_statfs(struct dentry *, struct kstatfs *);
  99 static int udf_show_options(struct seq_file *, struct dentry *);
 100
 101 struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct super_block *sb)
 102 {
 103         struct logicalVolIntegrityDesc *lvid;
 104         unsigned int partnum;
 105         unsigned int offset;
 106
 107         if (!UDF_SB(sb)->s_lvid_bh)
 108                 return NULL;
 109         lvid = (struct logicalVolIntegrityDesc *)UDF_SB(sb)->s_lvid_bh->b_data;
 110         partnum = le32_to_cpu(lvid->numOfPartitions);
 111         /* The offset is to skip freeSpaceTable and sizeTable arrays */
 112         offset = partnum * 2 * sizeof(uint32_t);
 113         return (struct logicalVolIntegrityDescImpUse *)
 114                                         (((uint8_t *)(lvid + 1)) + offset);
 115 }
 116
 117 /* UDF filesystem type */
 118 static struct dentry *udf_mount(struct file_system_type *fs_type,
 119                       int flags, const char *dev_name, void *data)
 120 {
 121         return mount_bdev(fs_type, flags, dev_name, data, udf_fill_super);
 122 }
 123
 124 static struct file_system_type udf_fstype = {
 125         .owner          = THIS_MODULE,
 126         .name           = "udf",
 127         .mount          = udf_mount,
 128         .kill_sb        = kill_block_super,
 129         .fs_flags       = FS_REQUIRES_DEV,
 130 };
 131 MODULE_ALIAS_FS("udf");
 132
 133 static struct kmem_cache *udf_inode_cachep;
 134
 135 static struct inode *udf_alloc_inode(struct super_block *sb)
 136 {
 137         struct udf_inode_info *ei;
 138         ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
 139         if (!ei)
 140                 return NULL;
 141
 142         ei->i_unique = 0;
 143         ei->i_lenExtents = 0;
 144         ei->i_lenStreams = 0;
 145         ei->i_next_alloc_block = 0;
 146         ei->i_next_alloc_goal = 0;
 147         ei->i_strat4096 = 0;
 148         ei->i_streamdir = 0;
 149         init_rwsem(&ei->i_data_sem);
 150         ei->cached_extent.lstart = -1;
 151         spin_lock_init(&ei->i_extent_cache_lock);
 152
 153         return &ei->vfs_inode;
 154 }
 155
 156 static void udf_free_in_core_inode(struct inode *inode)
 157 {
 158         kmem_cache_free(udf_inode_cachep, UDF_I(inode));
 159 }
 160
 161 static void init_once(void *foo)
 162 {
 163         struct udf_inode_info *ei = (struct udf_inode_info *)foo;
 164
 165         ei->i_data = NULL;
 166         inode_init_once(&ei->vfs_inode);
 167 }
 168
 169 static int __init init_inodecache(void)
 170 {
 171         udf_inode_cachep = kmem_cache_create("udf_inode_cache",
 172                                              sizeof(struct udf_inode_info),
 173                                              0, (SLAB_RECLAIM_ACCOUNT |
 174                                                  SLAB_MEM_SPREAD |
 175                                                  SLAB_ACCOUNT),
 176                                              init_once);
 177         if (!udf_inode_cachep)
 178                 return -ENOMEM;
 179         return 0;
 180 }
 181
 182 static void destroy_inodecache(void)
 183 {
 184         /*
 185          * Make sure all delayed rcu free inodes are flushed before we
 186          * destroy cache.
 187          */
 188         rcu_barrier();
 189         kmem_cache_destroy(udf_inode_cachep);
 190 }
 191
 192 /* Superblock operations */
 193 static const struct super_operations udf_sb_ops = {
 194         .alloc_inode    = udf_alloc_inode,
 195         .free_inode     = udf_free_in_core_inode,
 196         .write_inode    = udf_write_inode,
 197         .evict_inode    = udf_evict_inode,
 198         .put_super      = udf_put_super,
 199         .sync_fs        = udf_sync_fs,
 200         .statfs         = udf_statfs,
 201         .remount_fs     = udf_remount_fs,
 202         .show_options   = udf_show_options,
 203 };
 204
 205 struct udf_options {
 206         unsigned char novrs;
 207         unsigned int blocksize;
 208         unsigned int session;
 209         unsigned int lastblock;
 210         unsigned int anchor;
 211         unsigned int flags;
 212         umode_t umask;
 213         kgid_t gid;
 214         kuid_t uid;
 215         umode_t fmode;
 216         umode_t dmode;
 217         struct nls_table *nls_map;
 218 };
 219
 220 static int __init init_udf_fs(void)
 221 {
 222         int err;
 223
 224         err = init_inodecache();
 225         if (err)
 226                 goto out1;
 227         err = register_filesystem(&udf_fstype);
 228         if (err)
 229                 goto out;
 230
 231         return 0;
 232
 233 out:
 234         destroy_inodecache();
 235
 236 out1:
 237         return err;
 238 }
 239
 240 static void __exit exit_udf_fs(void)
 241 {
 242         unregister_filesystem(&udf_fstype);
 243         destroy_inodecache();
 244 }
 245
 246 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
 247 {
 248         struct udf_sb_info *sbi = UDF_SB(sb);
 249
 250         sbi->s_partmaps = kcalloc(count, sizeof(*sbi->s_partmaps), GFP_KERNEL);
 251         if (!sbi->s_partmaps) {
 252                 sbi->s_partitions = 0;
 253                 return -ENOMEM;
 254         }
 255
 256         sbi->s_partitions = count;
 257         return 0;
 258 }
 259
 260 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
 261 {
 262         int i;
 263         int nr_groups = bitmap->s_nr_groups;
 264
 265         for (i = 0; i < nr_groups; i++)
 266                 brelse(bitmap->s_block_bitmap[i]);
 267
 268         kvfree(bitmap);
 269 }
 270
 271 static void udf_free_partition(struct udf_part_map *map)
 272 {
 273         int i;
 274         struct udf_meta_data *mdata;
 275
 276         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
 277                 iput(map->s_uspace.s_table);
 278         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
 279                 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
 280         if (map->s_partition_type == UDF_SPARABLE_MAP15)
 281                 for (i = 0; i < 4; i++)
 282                         brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
 283         else if (map->s_partition_type == UDF_METADATA_MAP25) {
 284                 mdata = &map->s_type_specific.s_metadata;
 285                 iput(mdata->s_metadata_fe);
 286                 mdata->s_metadata_fe = NULL;
 287
 288                 iput(mdata->s_mirror_fe);
 289                 mdata->s_mirror_fe = NULL;
 290
 291                 iput(mdata->s_bitmap_fe);
 292                 mdata->s_bitmap_fe = NULL;
 293         }
 294 }
 295
 296 static void udf_sb_free_partitions(struct super_block *sb)
 297 {
 298         struct udf_sb_info *sbi = UDF_SB(sb);
 299         int i;
 300
 301         if (!sbi->s_partmaps)
 302                 return;
 303         for (i = 0; i < sbi->s_partitions; i++)
 304                 udf_free_partition(&sbi->s_partmaps[i]);
 305         kfree(sbi->s_partmaps);
 306         sbi->s_partmaps = NULL;
 307 }
 308
 309 static int udf_show_options(struct seq_file *seq, struct dentry *root)
 310 {
 311         struct super_block *sb = root->d_sb;
 312         struct udf_sb_info *sbi = UDF_SB(sb);
 313
 314         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
 315                 seq_puts(seq, ",nostrict");
 316         if (UDF_QUERY_FLAG(sb, UDF_FLAG_BLOCKSIZE_SET))
 317                 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
 318         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
 319                 seq_puts(seq, ",unhide");
 320         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
 321                 seq_puts(seq, ",undelete");
 322         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
 323                 seq_puts(seq, ",noadinicb");
 324         if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
 325                 seq_puts(seq, ",shortad");
 326         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
 327                 seq_puts(seq, ",uid=forget");
 328         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
 329                 seq_puts(seq, ",gid=forget");
 330         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
 331                 seq_printf(seq, ",uid=%u", from_kuid(&init_user_ns, sbi->s_uid));
 332         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
 333                 seq_printf(seq, ",gid=%u", from_kgid(&init_user_ns, sbi->s_gid));
 334         if (sbi->s_umask != 0)
 335                 seq_printf(seq, ",umask=%ho", sbi->s_umask);
 336         if (sbi->s_fmode != UDF_INVALID_MODE)
 337                 seq_printf(seq, ",mode=%ho", sbi->s_fmode);
 338         if (sbi->s_dmode != UDF_INVALID_MODE)
 339                 seq_printf(seq, ",dmode=%ho", sbi->s_dmode);
 340         if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
 341                 seq_printf(seq, ",session=%d", sbi->s_session);
 342         if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
 343                 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
 344         if (sbi->s_anchor != 0)
 345                 seq_printf(seq, ",anchor=%u", sbi->s_anchor);
 346         if (sbi->s_nls_map)
 347                 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
 348         else
 349                 seq_puts(seq, ",iocharset=utf8");
 350
 351         return 0;
 352 }
 353
 354 /*
 355  * udf_parse_options
 356  *
 357  * PURPOSE
 358  *      Parse mount options.
 359  *
 360  * DESCRIPTION
 361  *      The following mount options are supported:
 362  *
 363  *      gid=            Set the default group.
 364  *      umask=          Set the default umask.
 365  *      mode=           Set the default file permissions.
 366  *      dmode=          Set the default directory permissions.
 367  *      uid=            Set the default user.
 368  *      bs=             Set the block size.
 369  *      unhide          Show otherwise hidden files.
 370  *      undelete        Show deleted files in lists.
 371  *      adinicb         Embed data in the inode (default)
 372  *      noadinicb       Don't embed data in the inode
 373  *      shortad         Use short ad's
 374  *      longad          Use long ad's (default)
 375  *      nostrict        Unset strict conformance
 376  *      iocharset=      Set the NLS character set
 377  *
 378  *      The remaining are for debugging and disaster recovery:
 379  *
 380  *      novrs           Skip volume sequence recognition
 381  *
 382  *      The following expect a offset from 0.
 383  *
 384  *      session=        Set the CDROM session (default= last session)
 385  *      anchor=         Override standard anchor location. (default= 256)
 386  *      volume=         Override the VolumeDesc location. (unused)
 387  *      partition=      Override the PartitionDesc location. (unused)
 388  *      lastblock=      Set the last block of the filesystem/
 389  *
 390  *      The following expect a offset from the partition root.
 391  *
 392  *      fileset=        Override the fileset block location. (unused)
 393  *      rootdir=        Override the root directory location. (unused)
 394  *              WARNING: overriding the rootdir to a non-directory may
 395  *              yield highly unpredictable results.
 396  *
 397  * PRE-CONDITIONS
 398  *      options         Pointer to mount options string.
 399  *      uopts           Pointer to mount options variable.
 400  *
 401  * POST-CONDITIONS
 402  *      <return>        1       Mount options parsed okay.
 403  *      <return>        0       Error parsing mount options.
 404  *
 405  * HISTORY
 406  *      July 1, 1997 - Andrew E. Mileski
 407  *      Written, tested, and released.
 408  */
 409
 410 enum {
 411         Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
 412         Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
 413         Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
 414         Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
 415         Opt_rootdir, Opt_utf8, Opt_iocharset,
 416         Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore,
 417         Opt_fmode, Opt_dmode
 418 };
 419
 420 static const match_table_t tokens = {
 421         {Opt_novrs,     "novrs"},
 422         {Opt_nostrict,  "nostrict"},
 423         {Opt_bs,        "bs=%u"},
 424         {Opt_unhide,    "unhide"},
 425         {Opt_undelete,  "undelete"},
 426         {Opt_noadinicb, "noadinicb"},
 427         {Opt_adinicb,   "adinicb"},
 428         {Opt_shortad,   "shortad"},
 429         {Opt_longad,    "longad"},
 430         {Opt_uforget,   "uid=forget"},
 431         {Opt_uignore,   "uid=ignore"},
 432         {Opt_gforget,   "gid=forget"},
 433         {Opt_gignore,   "gid=ignore"},
 434         {Opt_gid,       "gid=%u"},
 435         {Opt_uid,       "uid=%u"},
 436         {Opt_umask,     "umask=%o"},
 437         {Opt_session,   "session=%u"},
 438         {Opt_lastblock, "lastblock=%u"},
 439         {Opt_anchor,    "anchor=%u"},
 440         {Opt_volume,    "volume=%u"},
 441         {Opt_partition, "partition=%u"},
 442         {Opt_fileset,   "fileset=%u"},
 443         {Opt_rootdir,   "rootdir=%u"},
 444         {Opt_utf8,      "utf8"},
 445         {Opt_iocharset, "iocharset=%s"},
 446         {Opt_fmode,     "mode=%o"},
 447         {Opt_dmode,     "dmode=%o"},
 448         {Opt_err,       NULL}
 449 };
 450
 451 static int udf_parse_options(char *options, struct udf_options *uopt,
 452                              bool remount)
 453 {
 454         char *p;
 455         int option;
 456         unsigned int uv;
 457
 458         uopt->novrs = 0;
 459         uopt->session = 0xFFFFFFFF;
 460         uopt->lastblock = 0;
 461         uopt->anchor = 0;
 462
 463         if (!options)
 464                 return 1;
 465
 466         while ((p = strsep(&options, ",")) != NULL) {
 467                 substring_t args[MAX_OPT_ARGS];
 468                 int token;
 469                 unsigned n;
 470                 if (!*p)
 471                         continue;
 472
 473                 token = match_token(p, tokens, args);
 474                 switch (token) {
 475                 case Opt_novrs:
 476                         uopt->novrs = 1;
 477                         break;
 478                 case Opt_bs:
 479                         if (match_int(&args[0], &option))
 480                                 return 0;
 481                         n = option;
 482                         if (n != 512 && n != 1024 && n != 2048 && n != 4096)
 483                                 return 0;
 484                         uopt->blocksize = n;
 485                         uopt->flags |= (1 << UDF_FLAG_BLOCKSIZE_SET);
 486                         break;
 487                 case Opt_unhide:
 488                         uopt->flags |= (1 << UDF_FLAG_UNHIDE);
 489                         break;
 490                 case Opt_undelete:
 491                         uopt->flags |= (1 << UDF_FLAG_UNDELETE);
 492                         break;
 493                 case Opt_noadinicb:
 494                         uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
 495                         break;
 496                 case Opt_adinicb:
 497                         uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
 498                         break;
 499                 case Opt_shortad:
 500                         uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
 501                         break;
 502                 case Opt_longad:
 503                         uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
 504                         break;
 505                 case Opt_gid:
 506                         if (match_uint(args, &uv))
 507                                 return 0;
 508                         uopt->gid = make_kgid(current_user_ns(), uv);
 509                         if (!gid_valid(uopt->gid))
 510                                 return 0;
 511                         uopt->flags |= (1 << UDF_FLAG_GID_SET);
 512                         break;
 513                 case Opt_uid:
 514                         if (match_uint(args, &uv))
 515                                 return 0;
 516                         uopt->uid = make_kuid(current_user_ns(), uv);
 517                         if (!uid_valid(uopt->uid))
 518                                 return 0;
 519                         uopt->flags |= (1 << UDF_FLAG_UID_SET);
 520                         break;
 521                 case Opt_umask:
 522                         if (match_octal(args, &option))
 523                                 return 0;
 524                         uopt->umask = option;
 525                         break;
 526                 case Opt_nostrict:
 527                         uopt->flags &= ~(1 << UDF_FLAG_STRICT);
 528                         break;
 529                 case Opt_session:
 530                         if (match_int(args, &option))
 531                                 return 0;
 532                         uopt->session = option;
 533                         if (!remount)
 534                                 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
 535                         break;
 536                 case Opt_lastblock:
 537                         if (match_int(args, &option))
 538                                 return 0;
 539                         uopt->lastblock = option;
 540                         if (!remount)
 541                                 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
 542                         break;
 543                 case Opt_anchor:
 544                         if (match_int(args, &option))
 545                                 return 0;
 546                         uopt->anchor = option;
 547                         break;
 548                 case Opt_volume:
 549                 case Opt_partition:
 550                 case Opt_fileset:
 551                 case Opt_rootdir:
 552                         /* Ignored (never implemented properly) */
 553                         break;
 554                 case Opt_utf8:
 555                         if (!remount) {
 556                                 unload_nls(uopt->nls_map);
 557                                 uopt->nls_map = NULL;
 558                         }
 559                         break;
 560                 case Opt_iocharset:
 561                         if (!remount) {
 562                                 unload_nls(uopt->nls_map);
 563                                 uopt->nls_map = NULL;
 564                         }
 565                         /* When nls_map is not loaded then UTF-8 is used */
 566                         if (!remount && strcmp(args[0].from, "utf8") != 0) {
 567                                 uopt->nls_map = load_nls(args[0].from);
 568                                 if (!uopt->nls_map) {
 569                                         pr_err("iocharset %s not found\n",
 570                                                 args[0].from);
 571                                         return 0;
 572                                 }
 573                         }
 574                         break;
 575                 case Opt_uforget:
 576                         uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
 577                         break;
 578                 case Opt_uignore:
 579                 case Opt_gignore:
 580                         /* These options are superseeded by uid=<number> */
 581                         break;
 582                 case Opt_gforget:
 583                         uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
 584                         break;
 585                 case Opt_fmode:
 586                         if (match_octal(args, &option))
 587                                 return 0;
 588                         uopt->fmode = option & 0777;
 589                         break;
 590                 case Opt_dmode:
 591                         if (match_octal(args, &option))
 592                                 return 0;
 593                         uopt->dmode = option & 0777;
 594                         break;
 595                 default:
 596                         pr_err("bad mount option \"%s\" or missing value\n", p);
 597                         return 0;
 598                 }
 599         }
 600         return 1;
 601 }
 602
 603 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
 604 {
 605         struct udf_options uopt;
 606         struct udf_sb_info *sbi = UDF_SB(sb);
 607         int error = 0;
 608
 609         if (!(*flags & SB_RDONLY) && UDF_QUERY_FLAG(sb, UDF_FLAG_RW_INCOMPAT))
 610                 return -EACCES;
 611
 612         sync_filesystem(sb);
 613
 614         uopt.flags = sbi->s_flags;
 615         uopt.uid   = sbi->s_uid;
 616         uopt.gid   = sbi->s_gid;
 617         uopt.umask = sbi->s_umask;
 618         uopt.fmode = sbi->s_fmode;
 619         uopt.dmode = sbi->s_dmode;
 620         uopt.nls_map = NULL;
 621
 622         if (!udf_parse_options(options, &uopt, true))
 623                 return -EINVAL;
 624
 625         write_lock(&sbi->s_cred_lock);
 626         sbi->s_flags = uopt.flags;
 627         sbi->s_uid   = uopt.uid;
 628         sbi->s_gid   = uopt.gid;
 629         sbi->s_umask = uopt.umask;
 630         sbi->s_fmode = uopt.fmode;
 631         sbi->s_dmode = uopt.dmode;
 632         write_unlock(&sbi->s_cred_lock);
 633
 634         if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
 635                 goto out_unlock;
 636
 637         if (*flags & SB_RDONLY)
 638                 udf_close_lvid(sb);
 639         else
 640                 udf_open_lvid(sb);
 641
 642 out_unlock:
 643         return error;
 644 }
 645
 646 /*
 647  * Check VSD descriptor. Returns -1 in case we are at the end of volume
 648  * recognition area, 0 if the descriptor is valid but non-interesting, 1 if
 649  * we found one of NSR descriptors we are looking for.
 650  */
 651 static int identify_vsd(const struct volStructDesc *vsd)
 652 {
 653         int ret = 0;
 654
 655         if (!memcmp(vsd->stdIdent, VSD_STD_ID_CD001, VSD_STD_ID_LEN)) {
 656                 switch (vsd->structType) {
 657                 case 0:
 658                         udf_debug("ISO9660 Boot Record found\n");
 659                         break;
 660                 case 1:
 661                         udf_debug("ISO9660 Primary Volume Descriptor found\n");
 662                         break;
 663                 case 2:
 664                         udf_debug("ISO9660 Supplementary Volume Descriptor found\n");
 665                         break;
 666                 case 3:
 667                         udf_debug("ISO9660 Volume Partition Descriptor found\n");
 668                         break;
 669                 case 255:
 670                         udf_debug("ISO9660 Volume Descriptor Set Terminator found\n");
 671                         break;
 672                 default:
 673                         udf_debug("ISO9660 VRS (%u) found\n", vsd->structType);
 674                         break;
 675                 }
 676         } else if (!memcmp(vsd->stdIdent, VSD_STD_ID_BEA01, VSD_STD_ID_LEN))
 677                 ; /* ret = 0 */
 678         else if (!memcmp(vsd->stdIdent, VSD_STD_ID_NSR02, VSD_STD_ID_LEN))
 679                 ret = 1;
 680         else if (!memcmp(vsd->stdIdent, VSD_STD_ID_NSR03, VSD_STD_ID_LEN))
 681                 ret = 1;
 682         else if (!memcmp(vsd->stdIdent, VSD_STD_ID_BOOT2, VSD_STD_ID_LEN))
 683                 ; /* ret = 0 */
 684         else if (!memcmp(vsd->stdIdent, VSD_STD_ID_CDW02, VSD_STD_ID_LEN))
 685                 ; /* ret = 0 */
 686         else {
 687                 /* TEA01 or invalid id : end of volume recognition area */
 688                 ret = -1;
 689         }
 690
 691         return ret;
 692 }
 693
 694 /*
 695  * Check Volume Structure Descriptors (ECMA 167 2/9.1)
 696  * We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1)
 697  * @return   1 if NSR02 or NSR03 found,
 698  *          -1 if first sector read error, 0 otherwise
 699  */
 700 static int udf_check_vsd(struct super_block *sb)
 701 {
 702         struct volStructDesc *vsd = NULL;
 703         loff_t sector = VSD_FIRST_SECTOR_OFFSET;
 704         int sectorsize;
 705         struct buffer_head *bh = NULL;
 706         int nsr = 0;
 707         struct udf_sb_info *sbi;
 708         loff_t session_offset;
 709
 710         sbi = UDF_SB(sb);
 711         if (sb->s_blocksize < sizeof(struct volStructDesc))
 712                 sectorsize = sizeof(struct volStructDesc);
 713         else
 714                 sectorsize = sb->s_blocksize;
 715
 716         session_offset = (loff_t)sbi->s_session << sb->s_blocksize_bits;
 717         sector += session_offset;
 718
 719         udf_debug("Starting at sector %u (%lu byte sectors)\n",
 720                   (unsigned int)(sector >> sb->s_blocksize_bits),
 721                   sb->s_blocksize);
 722         /* Process the sequence (if applicable). The hard limit on the sector
 723          * offset is arbitrary, hopefully large enough so that all valid UDF
 724          * filesystems will be recognised. There is no mention of an upper
 725          * bound to the size of the volume recognition area in the standard.
 726          *  The limit will prevent the code to read all the sectors of a
 727          * specially crafted image (like a bluray disc full of CD001 sectors),
 728          * potentially causing minutes or even hours of uninterruptible I/O
 729          * activity. This actually happened with uninitialised SSD partitions
 730          * (all 0xFF) before the check for the limit and all valid IDs were
 731          * added */
 732         for (; !nsr && sector < VSD_MAX_SECTOR_OFFSET; sector += sectorsize) {
 733                 /* Read a block */
 734                 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
 735                 if (!bh)
 736                         break;
 737
 738                 vsd = (struct volStructDesc *)(bh->b_data +
 739                                               (sector & (sb->s_blocksize - 1)));
 740                 nsr = identify_vsd(vsd);
 741                 /* Found NSR or end? */
 742                 if (nsr) {
 743                         brelse(bh);
 744                         break;
 745                 }
 746                 /*
 747                  * Special handling for improperly formatted VRS (e.g., Win10)
 748                  * where components are separated by 2048 bytes even though
 749                  * sectors are 4K
 750                  */
 751                 if (sb->s_blocksize == 4096) {
 752                         nsr = identify_vsd(vsd + 1);
 753                         /* Ignore unknown IDs... */
 754                         if (nsr < 0)
 755                                 nsr = 0;
 756                 }
 757                 brelse(bh);
 758         }
 759
 760         if (nsr > 0)
 761                 return 1;
 762         else if (!bh && sector - session_offset == VSD_FIRST_SECTOR_OFFSET)
 763                 return -1;
 764         else
 765                 return 0;
 766 }
 767
 768 static int udf_verify_domain_identifier(struct super_block *sb,
 769                                         struct regid *ident, char *dname)
 770 {
 771         struct domainIdentSuffix *suffix;
 772
 773         if (memcmp(ident->ident, UDF_ID_COMPLIANT, strlen(UDF_ID_COMPLIANT))) {
 774                 udf_warn(sb, "Not OSTA UDF compliant %s descriptor.\n", dname);
 775                 goto force_ro;
 776         }
 777         if (ident->flags & ENTITYID_FLAGS_DIRTY) {
 778                 udf_warn(sb, "Possibly not OSTA UDF compliant %s descriptor.\n",
 779                          dname);
 780                 goto force_ro;
 781         }
 782         suffix = (struct domainIdentSuffix *)ident->identSuffix;
 783         if ((suffix->domainFlags & DOMAIN_FLAGS_HARD_WRITE_PROTECT) ||
 784             (suffix->domainFlags & DOMAIN_FLAGS_SOFT_WRITE_PROTECT)) {
 785                 if (!sb_rdonly(sb)) {
 786                         udf_warn(sb, "Descriptor for %s marked write protected."
 787                                  " Forcing read only mount.\n", dname);
 788                 }
 789                 goto force_ro;
 790         }
 791         return 0;
 792
 793 force_ro:
 794         if (!sb_rdonly(sb))
 795                 return -EACCES;
 796         UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT);
 797         return 0;
 798 }
 799
 800 static int udf_load_fileset(struct super_block *sb, struct fileSetDesc *fset,
 801                             struct kernel_lb_addr *root)
 802 {
 803         int ret;
 804
 805         ret = udf_verify_domain_identifier(sb, &fset->domainIdent, "file set");
 806         if (ret < 0)
 807                 return ret;
 808
 809         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
 810         UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
 811
 812         udf_debug("Rootdir at block=%u, partition=%u\n",
 813                   root->logicalBlockNum, root->partitionReferenceNum);
 814         return 0;
 815 }
 816
 817 static int udf_find_fileset(struct super_block *sb,
 818                             struct kernel_lb_addr *fileset,
 819                             struct kernel_lb_addr *root)
 820 {
 821         struct buffer_head *bh = NULL;
 822         uint16_t ident;
 823         int ret;
 824
 825         if (fileset->logicalBlockNum == 0xFFFFFFFF &&
 826             fileset->partitionReferenceNum == 0xFFFF)
 827                 return -EINVAL;
 828
 829         bh = udf_read_ptagged(sb, fileset, 0, &ident);
 830         if (!bh)
 831                 return -EIO;
 832         if (ident != TAG_IDENT_FSD) {
 833                 brelse(bh);
 834                 return -EINVAL;
 835         }
 836
 837         udf_debug("Fileset at block=%u, partition=%u\n",
 838                   fileset->logicalBlockNum, fileset->partitionReferenceNum);
 839
 840         UDF_SB(sb)->s_partition = fileset->partitionReferenceNum;
 841         ret = udf_load_fileset(sb, (struct fileSetDesc *)bh->b_data, root);
 842         brelse(bh);
 843         return ret;
 844 }
 845
 846 /*
 847  * Load primary Volume Descriptor Sequence
 848  *
 849  * Return <0 on error, 0 on success. -EAGAIN is special meaning next sequence
 850  * should be tried.
 851  */
 852 static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
 853 {
 854         struct primaryVolDesc *pvoldesc;
 855         uint8_t *outstr;
 856         struct buffer_head *bh;
 857         uint16_t ident;
 858         int ret;
 859         struct timestamp *ts;
 860
 861         outstr = kmalloc(128, GFP_NOFS);
 862         if (!outstr)
 863                 return -ENOMEM;
 864
 865         bh = udf_read_tagged(sb, block, block, &ident);
 866         if (!bh) {
 867                 ret = -EAGAIN;
 868                 goto out2;
 869         }
 870
 871         if (ident != TAG_IDENT_PVD) {
 872                 ret = -EIO;
 873                 goto out_bh;
 874         }
 875
 876         pvoldesc = (struct primaryVolDesc *)bh->b_data;
 877
 878         udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
 879                               pvoldesc->recordingDateAndTime);
 880         ts = &pvoldesc->recordingDateAndTime;
 881         udf_debug("recording time %04u/%02u/%02u %02u:%02u (%x)\n",
 882                   le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
 883                   ts->minute, le16_to_cpu(ts->typeAndTimezone));
 884
 885         ret = udf_dstrCS0toChar(sb, outstr, 31, pvoldesc->volIdent, 32);
 886         if (ret < 0) {
 887                 strcpy(UDF_SB(sb)->s_volume_ident, "InvalidName");
 888                 pr_warn("incorrect volume identification, setting to "
 889                         "'InvalidName'\n");
 890         } else {
 891                 strncpy(UDF_SB(sb)->s_volume_ident, outstr, ret);
 892         }
 893         udf_debug("volIdent[] = '%s'\n", UDF_SB(sb)->s_volume_ident);
 894
 895         ret = udf_dstrCS0toChar(sb, outstr, 127, pvoldesc->volSetIdent, 128);
 896         if (ret < 0) {
 897                 ret = 0;
 898                 goto out_bh;
 899         }
 900         outstr[ret] = 0;
 901         udf_debug("volSetIdent[] = '%s'\n", outstr);
 902
 903         ret = 0;
 904 out_bh:
 905         brelse(bh);
 906 out2:
 907         kfree(outstr);
 908         return ret;
 909 }
 910
 911 struct inode *udf_find_metadata_inode_efe(struct super_block *sb,
 912                                         u32 meta_file_loc, u32 partition_ref)
 913 {
 914         struct kernel_lb_addr addr;
 915         struct inode *metadata_fe;
 916
 917         addr.logicalBlockNum = meta_file_loc;
 918         addr.partitionReferenceNum = partition_ref;
 919
 920         metadata_fe = udf_iget_special(sb, &addr);
 921
 922         if (IS_ERR(metadata_fe)) {
 923                 udf_warn(sb, "metadata inode efe not found\n");
 924                 return metadata_fe;
 925         }
 926         if (UDF_I(metadata_fe)->i_alloc_type != ICBTAG_FLAG_AD_SHORT) {
 927                 udf_warn(sb, "metadata inode efe does not have short allocation descriptors!\n");
 928                 iput(metadata_fe);
 929                 return ERR_PTR(-EIO);
 930         }
 931
 932         return metadata_fe;
 933 }
 934
 935 static int udf_load_metadata_files(struct super_block *sb, int partition,
 936                                    int type1_index)
 937 {
 938         struct udf_sb_info *sbi = UDF_SB(sb);
 939         struct udf_part_map *map;
 940         struct udf_meta_data *mdata;
 941         struct kernel_lb_addr addr;
 942         struct inode *fe;
 943
 944         map = &sbi->s_partmaps[partition];
 945         mdata = &map->s_type_specific.s_metadata;
 946         mdata->s_phys_partition_ref = type1_index;
 947
 948         /* metadata address */
 949         udf_debug("Metadata file location: block = %u part = %u\n",
 950                   mdata->s_meta_file_loc, mdata->s_phys_partition_ref);
 951
 952         fe = udf_find_metadata_inode_efe(sb, mdata->s_meta_file_loc,
 953                                          mdata->s_phys_partition_ref);
 954         if (IS_ERR(fe)) {
 955                 /* mirror file entry */
 956                 udf_debug("Mirror metadata file location: block = %u part = %u\n",
 957                           mdata->s_mirror_file_loc, mdata->s_phys_partition_ref);
 958
 959                 fe = udf_find_metadata_inode_efe(sb, mdata->s_mirror_file_loc,
 960                                                  mdata->s_phys_partition_ref);
 961
 962                 if (IS_ERR(fe)) {
 963                         udf_err(sb, "Both metadata and mirror metadata inode efe can not found\n");
 964                         return PTR_ERR(fe);
 965                 }
 966                 mdata->s_mirror_fe = fe;
 967         } else
 968                 mdata->s_metadata_fe = fe;
 969
 970
 971         /*
 972          * bitmap file entry
 973          * Note:
 974          * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
 975         */
 976         if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
 977                 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
 978                 addr.partitionReferenceNum = mdata->s_phys_partition_ref;
 979
 980                 udf_debug("Bitmap file location: block = %u part = %u\n",
 981                           addr.logicalBlockNum, addr.partitionReferenceNum);
 982
 983                 fe = udf_iget_special(sb, &addr);
 984                 if (IS_ERR(fe)) {
 985                         if (sb_rdonly(sb))
 986                                 udf_warn(sb, "bitmap inode efe not found but it's ok since the disc is mounted read-only\n");
 987                         else {
 988                                 udf_err(sb, "bitmap inode efe not found and attempted read-write mount\n");
 989                                 return PTR_ERR(fe);
 990                         }
 991                 } else
 992                         mdata->s_bitmap_fe = fe;
 993         }
 994
 995         udf_debug("udf_load_metadata_files Ok\n");
 996         return 0;
 997 }
 998
 999 int udf_compute_nr_groups(struct super_block *sb, u32 partition)
1000 {
1001         struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
1002         return DIV_ROUND_UP(map->s_partition_len +
1003                             (sizeof(struct spaceBitmapDesc) << 3),
1004                             sb->s_blocksize * 8);
1005 }
1006
1007 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
1008 {
1009         struct udf_bitmap *bitmap;
1010         int nr_groups = udf_compute_nr_groups(sb, index);
1011
1012         bitmap = kvzalloc(struct_size(bitmap, s_block_bitmap, nr_groups),
1013                           GFP_KERNEL);
1014         if (!bitmap)
1015                 return NULL;
1016
1017         bitmap->s_nr_groups = nr_groups;
1018         return bitmap;
1019 }
1020
1021 static int check_partition_desc(struct super_block *sb,
1022                                 struct partitionDesc *p,
1023                                 struct udf_part_map *map)
1024 {
1025         bool umap, utable, fmap, ftable;
1026         struct partitionHeaderDesc *phd;
1027
1028         switch (le32_to_cpu(p->accessType)) {
1029         case PD_ACCESS_TYPE_READ_ONLY:
1030         case PD_ACCESS_TYPE_WRITE_ONCE:
1031         case PD_ACCESS_TYPE_NONE:
1032                 goto force_ro;
1033         }
1034
1035         /* No Partition Header Descriptor? */
1036         if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1037             strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
1038                 goto force_ro;
1039
1040         phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1041         utable = phd->unallocSpaceTable.extLength;
1042         umap = phd->unallocSpaceBitmap.extLength;
1043         ftable = phd->freedSpaceTable.extLength;
1044         fmap = phd->freedSpaceBitmap.extLength;
1045
1046         /* No allocation info? */
1047         if (!utable && !umap && !ftable && !fmap)
1048                 goto force_ro;
1049
1050         /* We don't support blocks that require erasing before overwrite */
1051         if (ftable || fmap)
1052                 goto force_ro;
1053         /* UDF 2.60: 2.3.3 - no mixing of tables & bitmaps, no VAT. */
1054         if (utable && umap)
1055                 goto force_ro;
1056
1057         if (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1058             map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1059             map->s_partition_type == UDF_METADATA_MAP25)
1060                 goto force_ro;
1061
1062         return 0;
1063 force_ro:
1064         if (!sb_rdonly(sb))
1065                 return -EACCES;
1066         UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT);
1067         return 0;
1068 }
1069
1070 static int udf_fill_partdesc_info(struct super_block *sb,
1071                 struct partitionDesc *p, int p_index)
1072 {
1073         struct udf_part_map *map;
1074         struct udf_sb_info *sbi = UDF_SB(sb);
1075         struct partitionHeaderDesc *phd;
1076         int err;
1077
1078         map = &sbi->s_partmaps[p_index];
1079
1080         map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
1081         map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
1082
1083         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
1084                 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
1085         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
1086                 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
1087         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
1088                 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
1089         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
1090                 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
1091
1092         udf_debug("Partition (%d type %x) starts at physical %u, block length %u\n",
1093                   p_index, map->s_partition_type,
1094                   map->s_partition_root, map->s_partition_len);
1095
1096         err = check_partition_desc(sb, p, map);
1097         if (err)
1098                 return err;
1099
1100         /*
1101          * Skip loading allocation info it we cannot ever write to the fs.
1102          * This is a correctness thing as we may have decided to force ro mount
1103          * to avoid allocation info we don't support.
1104          */
1105         if (UDF_QUERY_FLAG(sb, UDF_FLAG_RW_INCOMPAT))
1106                 return 0;
1107
1108         phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1109         if (phd->unallocSpaceTable.extLength) {
1110                 struct kernel_lb_addr loc = {
1111                         .logicalBlockNum = le32_to_cpu(
1112                                 phd->unallocSpaceTable.extPosition),
1113                         .partitionReferenceNum = p_index,
1114                 };
1115                 struct inode *inode;
1116
1117                 inode = udf_iget_special(sb, &loc);
1118                 if (IS_ERR(inode)) {
1119                         udf_debug("cannot load unallocSpaceTable (part %d)\n",
1120                                   p_index);
1121                         return PTR_ERR(inode);
1122                 }
1123                 map->s_uspace.s_table = inode;
1124                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1125                 udf_debug("unallocSpaceTable (part %d) @ %lu\n",
1126                           p_index, map->s_uspace.s_table->i_ino);
1127         }
1128
1129         if (phd->unallocSpaceBitmap.extLength) {
1130                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1131                 if (!bitmap)
1132                         return -ENOMEM;
1133                 map->s_uspace.s_bitmap = bitmap;
1134                 bitmap->s_extPosition = le32_to_cpu(
1135                                 phd->unallocSpaceBitmap.extPosition);
1136                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1137                 udf_debug("unallocSpaceBitmap (part %d) @ %u\n",
1138                           p_index, bitmap->s_extPosition);
1139         }
1140
1141         return 0;
1142 }
1143
1144 static void udf_find_vat_block(struct super_block *sb, int p_index,
1145                                int type1_index, sector_t start_block)
1146 {
1147         struct udf_sb_info *sbi = UDF_SB(sb);
1148         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1149         sector_t vat_block;
1150         struct kernel_lb_addr ino;
1151         struct inode *inode;
1152
1153         /*
1154          * VAT file entry is in the last recorded block. Some broken disks have
1155          * it a few blocks before so try a bit harder...
1156          */
1157         ino.partitionReferenceNum = type1_index;
1158         for (vat_block = start_block;
1159              vat_block >= map->s_partition_root &&
1160              vat_block >= start_block - 3; vat_block--) {
1161                 ino.logicalBlockNum = vat_block - map->s_partition_root;
1162                 inode = udf_iget_special(sb, &ino);
1163                 if (!IS_ERR(inode)) {
1164                         sbi->s_vat_inode = inode;
1165                         break;
1166                 }
1167         }
1168 }
1169
1170 static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1171 {
1172         struct udf_sb_info *sbi = UDF_SB(sb);
1173         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1174         struct buffer_head *bh = NULL;
1175         struct udf_inode_info *vati;
1176         uint32_t pos;
1177         struct virtualAllocationTable20 *vat20;
1178         sector_t blocks = sb_bdev_nr_blocks(sb);
1179
1180         udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block);
1181         if (!sbi->s_vat_inode &&
1182             sbi->s_last_block != blocks - 1) {
1183                 pr_notice("Failed to read VAT inode from the last recorded block (%lu), retrying with the last block of the device (%lu).\n",
1184                           (unsigned long)sbi->s_last_block,
1185                           (unsigned long)blocks - 1);
1186                 udf_find_vat_block(sb, p_index, type1_index, blocks - 1);
1187         }
1188         if (!sbi->s_vat_inode)
1189                 return -EIO;
1190
1191         if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1192                 map->s_type_specific.s_virtual.s_start_offset = 0;
1193                 map->s_type_specific.s_virtual.s_num_entries =
1194                         (sbi->s_vat_inode->i_size - 36) >> 2;
1195         } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1196                 vati = UDF_I(sbi->s_vat_inode);
1197                 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1198                         pos = udf_block_map(sbi->s_vat_inode, 0);
1199                         bh = sb_bread(sb, pos);
1200                         if (!bh)
1201                                 return -EIO;
1202                         vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1203                 } else {
1204                         vat20 = (struct virtualAllocationTable20 *)
1205                                                         vati->i_data;
1206                 }
1207
1208                 map->s_type_specific.s_virtual.s_start_offset =
1209                         le16_to_cpu(vat20->lengthHeader);
1210                 map->s_type_specific.s_virtual.s_num_entries =
1211                         (sbi->s_vat_inode->i_size -
1212                                 map->s_type_specific.s_virtual.
1213                                         s_start_offset) >> 2;
1214                 brelse(bh);
1215         }
1216         return 0;
1217 }
1218
1219 /*
1220  * Load partition descriptor block
1221  *
1222  * Returns <0 on error, 0 on success, -EAGAIN is special - try next descriptor
1223  * sequence.
1224  */
1225 static int udf_load_partdesc(struct super_block *sb, sector_t block)
1226 {
1227         struct buffer_head *bh;
1228         struct partitionDesc *p;
1229         struct udf_part_map *map;
1230         struct udf_sb_info *sbi = UDF_SB(sb);
1231         int i, type1_idx;
1232         uint16_t partitionNumber;
1233         uint16_t ident;
1234         int ret;
1235
1236         bh = udf_read_tagged(sb, block, block, &ident);
1237         if (!bh)
1238                 return -EAGAIN;
1239         if (ident != TAG_IDENT_PD) {
1240                 ret = 0;
1241                 goto out_bh;
1242         }
1243
1244         p = (struct partitionDesc *)bh->b_data;
1245         partitionNumber = le16_to_cpu(p->partitionNumber);
1246
1247         /* First scan for TYPE1 and SPARABLE partitions */
1248         for (i = 0; i < sbi->s_partitions; i++) {
1249                 map = &sbi->s_partmaps[i];
1250                 udf_debug("Searching map: (%u == %u)\n",
1251                           map->s_partition_num, partitionNumber);
1252                 if (map->s_partition_num == partitionNumber &&
1253                     (map->s_partition_type == UDF_TYPE1_MAP15 ||
1254                      map->s_partition_type == UDF_SPARABLE_MAP15))
1255                         break;
1256         }
1257
1258         if (i >= sbi->s_partitions) {
1259                 udf_debug("Partition (%u) not found in partition map\n",
1260                           partitionNumber);
1261                 ret = 0;
1262                 goto out_bh;
1263         }
1264
1265         ret = udf_fill_partdesc_info(sb, p, i);
1266         if (ret < 0)
1267                 goto out_bh;
1268
1269         /*
1270          * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1271          * PHYSICAL partitions are already set up
1272          */
1273         type1_idx = i;
1274         map = NULL; /* supress 'maybe used uninitialized' warning */
1275         for (i = 0; i < sbi->s_partitions; i++) {
1276                 map = &sbi->s_partmaps[i];
1277
1278                 if (map->s_partition_num == partitionNumber &&
1279                     (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1280                      map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1281                      map->s_partition_type == UDF_METADATA_MAP25))
1282                         break;
1283         }
1284
1285         if (i >= sbi->s_partitions) {
1286                 ret = 0;
1287                 goto out_bh;
1288         }
1289
1290         ret = udf_fill_partdesc_info(sb, p, i);
1291         if (ret < 0)
1292                 goto out_bh;
1293
1294         if (map->s_partition_type == UDF_METADATA_MAP25) {
1295                 ret = udf_load_metadata_files(sb, i, type1_idx);
1296                 if (ret < 0) {
1297                         udf_err(sb, "error loading MetaData partition map %d\n",
1298                                 i);
1299                         goto out_bh;
1300                 }
1301         } else {
1302                 /*
1303                  * If we have a partition with virtual map, we don't handle
1304                  * writing to it (we overwrite blocks instead of relocating
1305                  * them).
1306                  */
1307                 if (!sb_rdonly(sb)) {
1308                         ret = -EACCES;
1309                         goto out_bh;
1310                 }
1311                 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT);
1312                 ret = udf_load_vat(sb, i, type1_idx);
1313                 if (ret < 0)
1314                         goto out_bh;
1315         }
1316         ret = 0;
1317 out_bh:
1318         /* In case loading failed, we handle cleanup in udf_fill_super */
1319         brelse(bh);
1320         return ret;
1321 }
1322
1323 static int udf_load_sparable_map(struct super_block *sb,
1324                                  struct udf_part_map *map,
1325                                  struct sparablePartitionMap *spm)
1326 {
1327         uint32_t loc;
1328         uint16_t ident;
1329         struct sparingTable *st;
1330         struct udf_sparing_data *sdata = &map->s_type_specific.s_sparing;
1331         int i;
1332         struct buffer_head *bh;
1333
1334         map->s_partition_type = UDF_SPARABLE_MAP15;
1335         sdata->s_packet_len = le16_to_cpu(spm->packetLength);
1336         if (!is_power_of_2(sdata->s_packet_len)) {
1337                 udf_err(sb, "error loading logical volume descriptor: "
1338                         "Invalid packet length %u\n",
1339                         (unsigned)sdata->s_packet_len);
1340                 return -EIO;
1341         }
1342         if (spm->numSparingTables > 4) {
1343                 udf_err(sb, "error loading logical volume descriptor: "
1344                         "Too many sparing tables (%d)\n",
1345                         (int)spm->numSparingTables);
1346                 return -EIO;
1347         }
1348         if (le32_to_cpu(spm->sizeSparingTable) > sb->s_blocksize) {
1349                 udf_err(sb, "error loading logical volume descriptor: "
1350                         "Too big sparing table size (%u)\n",
1351                         le32_to_cpu(spm->sizeSparingTable));
1352                 return -EIO;
1353         }
1354
1355         for (i = 0; i < spm->numSparingTables; i++) {
1356                 loc = le32_to_cpu(spm->locSparingTable[i]);
1357                 bh = udf_read_tagged(sb, loc, loc, &ident);
1358                 if (!bh)
1359                         continue;
1360
1361                 st = (struct sparingTable *)bh->b_data;
1362                 if (ident != 0 ||
1363                     strncmp(st->sparingIdent.ident, UDF_ID_SPARING,
1364                             strlen(UDF_ID_SPARING)) ||
1365                     sizeof(*st) + le16_to_cpu(st->reallocationTableLen) >
1366                                                         sb->s_blocksize) {
1367                         brelse(bh);
1368                         continue;
1369                 }
1370
1371                 sdata->s_spar_map[i] = bh;
1372         }
1373         map->s_partition_func = udf_get_pblock_spar15;
1374         return 0;
1375 }
1376
1377 static int udf_load_logicalvol(struct super_block *sb, sector_t block,
1378                                struct kernel_lb_addr *fileset)
1379 {
1380         struct logicalVolDesc *lvd;
1381         int i, offset;
1382         uint8_t type;
1383         struct udf_sb_info *sbi = UDF_SB(sb);
1384         struct genericPartitionMap *gpm;
1385         uint16_t ident;
1386         struct buffer_head *bh;
1387         unsigned int table_len;
1388         int ret;
1389
1390         bh = udf_read_tagged(sb, block, block, &ident);
1391         if (!bh)
1392                 return -EAGAIN;
1393         BUG_ON(ident != TAG_IDENT_LVD);
1394         lvd = (struct logicalVolDesc *)bh->b_data;
1395         table_len = le32_to_cpu(lvd->mapTableLength);
1396         if (table_len > sb->s_blocksize - sizeof(*lvd)) {
1397                 udf_err(sb, "error loading logical volume descriptor: "
1398                         "Partition table too long (%u > %lu)\n", table_len,
1399                         sb->s_blocksize - sizeof(*lvd));
1400                 ret = -EIO;
1401                 goto out_bh;
1402         }
1403
1404         ret = udf_verify_domain_identifier(sb, &lvd->domainIdent,
1405                                            "logical volume");
1406         if (ret)
1407                 goto out_bh;
1408         ret = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1409         if (ret)
1410                 goto out_bh;
1411
1412         for (i = 0, offset = 0;
1413              i < sbi->s_partitions && offset < table_len;
1414              i++, offset += gpm->partitionMapLength) {
1415                 struct udf_part_map *map = &sbi->s_partmaps[i];
1416                 gpm = (struct genericPartitionMap *)
1417                                 &(lvd->partitionMaps[offset]);
1418                 type = gpm->partitionMapType;
1419                 if (type == 1) {
1420                         struct genericPartitionMap1 *gpm1 =
1421                                 (struct genericPartitionMap1 *)gpm;
1422                         map->s_partition_type = UDF_TYPE1_MAP15;
1423                         map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1424                         map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1425                         map->s_partition_func = NULL;
1426                 } else if (type == 2) {
1427                         struct udfPartitionMap2 *upm2 =
1428                                                 (struct udfPartitionMap2 *)gpm;
1429                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1430                                                 strlen(UDF_ID_VIRTUAL))) {
1431                                 u16 suf =
1432                                         le16_to_cpu(((__le16 *)upm2->partIdent.
1433                                                         identSuffix)[0]);
1434                                 if (suf < 0x0200) {
1435                                         map->s_partition_type =
1436                                                         UDF_VIRTUAL_MAP15;
1437                                         map->s_partition_func =
1438                                                         udf_get_pblock_virt15;
1439                                 } else {
1440                                         map->s_partition_type =
1441                                                         UDF_VIRTUAL_MAP20;
1442                                         map->s_partition_func =
1443                                                         udf_get_pblock_virt20;
1444                                 }
1445                         } else if (!strncmp(upm2->partIdent.ident,
1446                                                 UDF_ID_SPARABLE,
1447                                                 strlen(UDF_ID_SPARABLE))) {
1448                                 ret = udf_load_sparable_map(sb, map,
1449                                         (struct sparablePartitionMap *)gpm);
1450                                 if (ret < 0)
1451                                         goto out_bh;
1452                         } else if (!strncmp(upm2->partIdent.ident,
1453                                                 UDF_ID_METADATA,
1454                                                 strlen(UDF_ID_METADATA))) {
1455                                 struct udf_meta_data *mdata =
1456                                         &map->s_type_specific.s_metadata;
1457                                 struct metadataPartitionMap *mdm =
1458                                                 (struct metadataPartitionMap *)
1459                                                 &(lvd->partitionMaps[offset]);
1460                                 udf_debug("Parsing Logical vol part %d type %u  id=%s\n",
1461                                           i, type, UDF_ID_METADATA);
1462
1463                                 map->s_partition_type = UDF_METADATA_MAP25;
1464                                 map->s_partition_func = udf_get_pblock_meta25;
1465
1466                                 mdata->s_meta_file_loc   =
1467                                         le32_to_cpu(mdm->metadataFileLoc);
1468                                 mdata->s_mirror_file_loc =
1469                                         le32_to_cpu(mdm->metadataMirrorFileLoc);
1470                                 mdata->s_bitmap_file_loc =
1471                                         le32_to_cpu(mdm->metadataBitmapFileLoc);
1472                                 mdata->s_alloc_unit_size =
1473                                         le32_to_cpu(mdm->allocUnitSize);
1474                                 mdata->s_align_unit_size =
1475                                         le16_to_cpu(mdm->alignUnitSize);
1476                                 if (mdm->flags & 0x01)
1477                                         mdata->s_flags |= MF_DUPLICATE_MD;
1478
1479                                 udf_debug("Metadata Ident suffix=0x%x\n",
1480                                           le16_to_cpu(*(__le16 *)
1481                                                       mdm->partIdent.identSuffix));
1482                                 udf_debug("Metadata part num=%u\n",
1483                                           le16_to_cpu(mdm->partitionNum));
1484                                 udf_debug("Metadata part alloc unit size=%u\n",
1485                                           le32_to_cpu(mdm->allocUnitSize));
1486                                 udf_debug("Metadata file loc=%u\n",
1487                                           le32_to_cpu(mdm->metadataFileLoc));
1488                                 udf_debug("Mirror file loc=%u\n",
1489                                           le32_to_cpu(mdm->metadataMirrorFileLoc));
1490                                 udf_debug("Bitmap file loc=%u\n",
1491                                           le32_to_cpu(mdm->metadataBitmapFileLoc));
1492                                 udf_debug("Flags: %d %u\n",
1493                                           mdata->s_flags, mdm->flags);
1494                         } else {
1495                                 udf_debug("Unknown ident: %s\n",
1496                                           upm2->partIdent.ident);
1497                                 continue;
1498                         }
1499                         map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1500                         map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1501                 }
1502                 udf_debug("Partition (%d:%u) type %u on volume %u\n",
1503                           i, map->s_partition_num, type, map->s_volumeseqnum);
1504         }
1505
1506         if (fileset) {
1507                 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
1508
1509                 *fileset = lelb_to_cpu(la->extLocation);
1510                 udf_debug("FileSet found in LogicalVolDesc at block=%u, partition=%u\n",
1511                           fileset->logicalBlockNum,
1512                           fileset->partitionReferenceNum);
1513         }
1514         if (lvd->integritySeqExt.extLength)
1515                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1516         ret = 0;
1517
1518         if (!sbi->s_lvid_bh) {
1519                 /* We can't generate unique IDs without a valid LVID */
1520                 if (sb_rdonly(sb)) {
1521                         UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT);
1522                 } else {
1523                         udf_warn(sb, "Damaged or missing LVID, forcing "
1524                                      "readonly mount\n");
1525                         ret = -EACCES;
1526                 }
1527         }
1528 out_bh:
1529         brelse(bh);
1530         return ret;
1531 }
1532
1533 /*
1534  * Find the prevailing Logical Volume Integrity Descriptor.
1535  */
1536 static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
1537 {
1538         struct buffer_head *bh, *final_bh;
1539         uint16_t ident;
1540         struct udf_sb_info *sbi = UDF_SB(sb);
1541         struct logicalVolIntegrityDesc *lvid;
1542         int indirections = 0;
1543         u32 parts, impuselen;
1544
1545         while (++indirections <= UDF_MAX_LVID_NESTING) {
1546                 final_bh = NULL;
1547                 while (loc.extLength > 0 &&
1548                         (bh = udf_read_tagged(sb, loc.extLocation,
1549                                         loc.extLocation, &ident))) {
1550                         if (ident != TAG_IDENT_LVID) {
1551                                 brelse(bh);
1552                                 break;
1553                         }
1554
1555                         brelse(final_bh);
1556                         final_bh = bh;
1557
1558                         loc.extLength -= sb->s_blocksize;
1559                         loc.extLocation++;
1560                 }
1561
1562                 if (!final_bh)
1563                         return;
1564
1565                 brelse(sbi->s_lvid_bh);
1566                 sbi->s_lvid_bh = final_bh;
1567
1568                 lvid = (struct logicalVolIntegrityDesc *)final_bh->b_data;
1569                 if (lvid->nextIntegrityExt.extLength == 0)
1570                         goto check;
1571
1572                 loc = leea_to_cpu(lvid->nextIntegrityExt);
1573         }
1574
1575         udf_warn(sb, "Too many LVID indirections (max %u), ignoring.\n",
1576                 UDF_MAX_LVID_NESTING);
1577 out_err:
1578         brelse(sbi->s_lvid_bh);
1579         sbi->s_lvid_bh = NULL;
1580         return;
1581 check:
1582         parts = le32_to_cpu(lvid->numOfPartitions);
1583         impuselen = le32_to_cpu(lvid->lengthOfImpUse);
1584         if (parts >= sb->s_blocksize || impuselen >= sb->s_blocksize ||
1585             sizeof(struct logicalVolIntegrityDesc) + impuselen +
1586             2 * parts * sizeof(u32) > sb->s_blocksize) {
1587                 udf_warn(sb, "Corrupted LVID (parts=%u, impuselen=%u), "
1588                          "ignoring.\n", parts, impuselen);
1589                 goto out_err;
1590         }
1591 }
1592
1593 /*
1594  * Step for reallocation of table of partition descriptor sequence numbers.
1595  * Must be power of 2.
1596  */
1597 #define PART_DESC_ALLOC_STEP 32
1598
1599 struct part_desc_seq_scan_data {
1600         struct udf_vds_record rec;
1601         u32 partnum;
1602 };
1603
1604 struct desc_seq_scan_data {
1605         struct udf_vds_record vds[VDS_POS_LENGTH];
1606         unsigned int size_part_descs;
1607         unsigned int num_part_descs;
1608         struct part_desc_seq_scan_data *part_descs_loc;
1609 };
1610
1611 static struct udf_vds_record *handle_partition_descriptor(
1612                                 struct buffer_head *bh,
1613                                 struct desc_seq_scan_data *data)
1614 {
1615         struct partitionDesc *desc = (struct partitionDesc *)bh->b_data;
1616         int partnum;
1617         int i;
1618
1619         partnum = le16_to_cpu(desc->partitionNumber);
1620         for (i = 0; i < data->num_part_descs; i++)
1621                 if (partnum == data->part_descs_loc[i].partnum)
1622                         return &(data->part_descs_loc[i].rec);
1623         if (data->num_part_descs >= data->size_part_descs) {
1624                 struct part_desc_seq_scan_data *new_loc;
1625                 unsigned int new_size = ALIGN(partnum, PART_DESC_ALLOC_STEP);
1626
1627                 new_loc = kcalloc(new_size, sizeof(*new_loc), GFP_KERNEL);
1628                 if (!new_loc)
1629                         return ERR_PTR(-ENOMEM);
1630                 memcpy(new_loc, data->part_descs_loc,
1631                        data->size_part_descs * sizeof(*new_loc));
1632                 kfree(data->part_descs_loc);
1633                 data->part_descs_loc = new_loc;
1634                 data->size_part_descs = new_size;
1635         }
1636         return &(data->part_descs_loc[data->num_part_descs++].rec);
1637 }
1638
1639
1640 static struct udf_vds_record *get_volume_descriptor_record(uint16_t ident,
1641                 struct buffer_head *bh, struct desc_seq_scan_data *data)
1642 {
1643         switch (ident) {
1644         case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1645                 return &(data->vds[VDS_POS_PRIMARY_VOL_DESC]);
1646         case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1647                 return &(data->vds[VDS_POS_IMP_USE_VOL_DESC]);
1648         case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1649                 return &(data->vds[VDS_POS_LOGICAL_VOL_DESC]);
1650         case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1651                 return &(data->vds[VDS_POS_UNALLOC_SPACE_DESC]);
1652         case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1653                 return handle_partition_descriptor(bh, data);
1654         }
1655         return NULL;
1656 }
1657
1658 /*
1659  * Process a main/reserve volume descriptor sequence.
1660  *   @block             First block of first extent of the sequence.
1661  *   @lastblock         Lastblock of first extent of the sequence.
1662  *   @fileset           There we store extent containing root fileset
1663  *
1664  * Returns <0 on error, 0 on success. -EAGAIN is special - try next descriptor
1665  * sequence
1666  */
1667 static noinline int udf_process_sequence(
1668                 struct super_block *sb,
1669                 sector_t block, sector_t lastblock,
1670                 struct kernel_lb_addr *fileset)
1671 {
1672         struct buffer_head *bh = NULL;
1673         struct udf_vds_record *curr;
1674         struct generic_desc *gd;
1675         struct volDescPtr *vdp;
1676         bool done = false;
1677         uint32_t vdsn;
1678         uint16_t ident;
1679         int ret;
1680         unsigned int indirections = 0;
1681         struct desc_seq_scan_data data;
1682         unsigned int i;
1683
1684         memset(data.vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1685         data.size_part_descs = PART_DESC_ALLOC_STEP;
1686         data.num_part_descs = 0;
1687         data.part_descs_loc = kcalloc(data.size_part_descs,
1688                                       sizeof(*data.part_descs_loc),
1689                                       GFP_KERNEL);
1690         if (!data.part_descs_loc)
1691                 return -ENOMEM;
1692
1693         /*
1694          * Read the main descriptor sequence and find which descriptors
1695          * are in it.
1696          */
1697         for (; (!done && block <= lastblock); block++) {
1698                 bh = udf_read_tagged(sb, block, block, &ident);
1699                 if (!bh)
1700                         break;
1701
1702                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1703                 gd = (struct generic_desc *)bh->b_data;
1704                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1705                 switch (ident) {
1706                 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1707                         if (++indirections > UDF_MAX_TD_NESTING) {
1708                                 udf_err(sb, "too many Volume Descriptor "
1709                                         "Pointers (max %u supported)\n",
1710                                         UDF_MAX_TD_NESTING);
1711                                 brelse(bh);
1712                                 ret = -EIO;
1713                                 goto out;
1714                         }
1715
1716                         vdp = (struct volDescPtr *)bh->b_data;
1717                         block = le32_to_cpu(vdp->nextVolDescSeqExt.extLocation);
1718                         lastblock = le32_to_cpu(
1719                                 vdp->nextVolDescSeqExt.extLength) >>
1720                                 sb->s_blocksize_bits;
1721                         lastblock += block - 1;
1722                         /* For loop is going to increment 'block' again */
1723                         block--;
1724                         break;
1725                 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1726                 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1727                 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1728                 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1729                 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1730                         curr = get_volume_descriptor_record(ident, bh, &data);
1731                         if (IS_ERR(curr)) {
1732                                 brelse(bh);
1733                                 ret = PTR_ERR(curr);
1734                                 goto out;
1735                         }
1736                         /* Descriptor we don't care about? */
1737                         if (!curr)
1738                                 break;
1739                         if (vdsn >= curr->volDescSeqNum) {
1740                                 curr->volDescSeqNum = vdsn;
1741                                 curr->block = block;
1742                         }
1743                         break;
1744                 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1745                         done = true;
1746                         break;
1747                 }
1748                 brelse(bh);
1749         }
1750         /*
1751          * Now read interesting descriptors again and process them
1752          * in a suitable order
1753          */
1754         if (!data.vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1755                 udf_err(sb, "Primary Volume Descriptor not found!\n");
1756                 ret = -EAGAIN;
1757                 goto out;
1758         }
1759         ret = udf_load_pvoldesc(sb, data.vds[VDS_POS_PRIMARY_VOL_DESC].block);
1760         if (ret < 0)
1761                 goto out;
1762
1763         if (data.vds[VDS_POS_LOGICAL_VOL_DESC].block) {
1764                 ret = udf_load_logicalvol(sb,
1765                                 data.vds[VDS_POS_LOGICAL_VOL_DESC].block,
1766                                 fileset);
1767                 if (ret < 0)
1768                         goto out;
1769         }
1770
1771         /* Now handle prevailing Partition Descriptors */
1772         for (i = 0; i < data.num_part_descs; i++) {
1773                 ret = udf_load_partdesc(sb, data.part_descs_loc[i].rec.block);
1774                 if (ret < 0)
1775                         goto out;
1776         }
1777         ret = 0;
1778 out:
1779         kfree(data.part_descs_loc);
1780         return ret;
1781 }
1782
1783 /*
1784  * Load Volume Descriptor Sequence described by anchor in bh
1785  *
1786  * Returns <0 on error, 0 on success
1787  */
1788 static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh,
1789                              struct kernel_lb_addr *fileset)
1790 {
1791         struct anchorVolDescPtr *anchor;
1792         sector_t main_s, main_e, reserve_s, reserve_e;
1793         int ret;
1794
1795         anchor = (struct anchorVolDescPtr *)bh->b_data;
1796
1797         /* Locate the main sequence */
1798         main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1799         main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1800         main_e = main_e >> sb->s_blocksize_bits;
1801         main_e += main_s - 1;
1802
1803         /* Locate the reserve sequence */
1804         reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1805         reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1806         reserve_e = reserve_e >> sb->s_blocksize_bits;
1807         reserve_e += reserve_s - 1;
1808
1809         /* Process the main & reserve sequences */
1810         /* responsible for finding the PartitionDesc(s) */
1811         ret = udf_process_sequence(sb, main_s, main_e, fileset);
1812         if (ret != -EAGAIN)
1813                 return ret;
1814         udf_sb_free_partitions(sb);
1815         ret = udf_process_sequence(sb, reserve_s, reserve_e, fileset);
1816         if (ret < 0) {
1817                 udf_sb_free_partitions(sb);
1818                 /* No sequence was OK, return -EIO */
1819                 if (ret == -EAGAIN)
1820                         ret = -EIO;
1821         }
1822         return ret;
1823 }
1824
1825 /*
1826  * Check whether there is an anchor block in the given block and
1827  * load Volume Descriptor Sequence if so.
1828  *
1829  * Returns <0 on error, 0 on success, -EAGAIN is special - try next anchor
1830  * block
1831  */
1832 static int udf_check_anchor_block(struct super_block *sb, sector_t block,
1833                                   struct kernel_lb_addr *fileset)
1834 {
1835         struct buffer_head *bh;
1836         uint16_t ident;
1837         int ret;
1838
1839         if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
1840             udf_fixed_to_variable(block) >= sb_bdev_nr_blocks(sb))
1841                 return -EAGAIN;
1842
1843         bh = udf_read_tagged(sb, block, block, &ident);
1844         if (!bh)
1845                 return -EAGAIN;
1846         if (ident != TAG_IDENT_AVDP) {
1847                 brelse(bh);
1848                 return -EAGAIN;
1849         }
1850         ret = udf_load_sequence(sb, bh, fileset);
1851         brelse(bh);
1852         return ret;
1853 }
1854
1855 /*
1856  * Search for an anchor volume descriptor pointer.
1857  *
1858  * Returns < 0 on error, 0 on success. -EAGAIN is special - try next set
1859  * of anchors.
1860  */
1861 static int udf_scan_anchors(struct super_block *sb, sector_t *lastblock,
1862                             struct kernel_lb_addr *fileset)
1863 {
1864         sector_t last[6];
1865         int i;
1866         struct udf_sb_info *sbi = UDF_SB(sb);
1867         int last_count = 0;
1868         int ret;
1869
1870         /* First try user provided anchor */
1871         if (sbi->s_anchor) {
1872                 ret = udf_check_anchor_block(sb, sbi->s_anchor, fileset);
1873                 if (ret != -EAGAIN)
1874                         return ret;
1875         }
1876         /*
1877          * according to spec, anchor is in either:
1878          *     block 256
1879          *     lastblock-256
1880          *     lastblock
1881          *  however, if the disc isn't closed, it could be 512.
1882          */
1883         ret = udf_check_anchor_block(sb, sbi->s_session + 256, fileset);
1884         if (ret != -EAGAIN)
1885                 return ret;
1886         /*
1887          * The trouble is which block is the last one. Drives often misreport
1888          * this so we try various possibilities.
1889          */
1890         last[last_count++] = *lastblock;
1891         if (*lastblock >= 1)
1892                 last[last_count++] = *lastblock - 1;
1893         last[last_count++] = *lastblock + 1;
1894         if (*lastblock >= 2)
1895                 last[last_count++] = *lastblock - 2;
1896         if (*lastblock >= 150)
1897                 last[last_count++] = *lastblock - 150;
1898         if (*lastblock >= 152)
1899                 last[last_count++] = *lastblock - 152;
1900
1901         for (i = 0; i < last_count; i++) {
1902                 if (last[i] >= sb_bdev_nr_blocks(sb))
1903                         continue;
1904                 ret = udf_check_anchor_block(sb, last[i], fileset);
1905                 if (ret != -EAGAIN) {
1906                         if (!ret)
1907                                 *lastblock = last[i];
1908                         return ret;
1909                 }
1910                 if (last[i] < 256)
1911                         continue;
1912                 ret = udf_check_anchor_block(sb, last[i] - 256, fileset);
1913                 if (ret != -EAGAIN) {
1914                         if (!ret)
1915                                 *lastblock = last[i];
1916                         return ret;
1917                 }
1918         }
1919
1920         /* Finally try block 512 in case media is open */
1921         return udf_check_anchor_block(sb, sbi->s_session + 512, fileset);
1922 }
1923
1924 /*
1925  * Find an anchor volume descriptor and load Volume Descriptor Sequence from
1926  * area specified by it. The function expects sbi->s_lastblock to be the last
1927  * block on the media.
1928  *
1929  * Return <0 on error, 0 if anchor found. -EAGAIN is special meaning anchor
1930  * was not found.
1931  */
1932 static int udf_find_anchor(struct super_block *sb,
1933                            struct kernel_lb_addr *fileset)
1934 {
1935         struct udf_sb_info *sbi = UDF_SB(sb);
1936         sector_t lastblock = sbi->s_last_block;
1937         int ret;
1938
1939         ret = udf_scan_anchors(sb, &lastblock, fileset);
1940         if (ret != -EAGAIN)
1941                 goto out;
1942
1943         /* No anchor found? Try VARCONV conversion of block numbers */
1944         UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
1945         lastblock = udf_variable_to_fixed(sbi->s_last_block);
1946         /* Firstly, we try to not convert number of the last block */
1947         ret = udf_scan_anchors(sb, &lastblock, fileset);
1948         if (ret != -EAGAIN)
1949                 goto out;
1950
1951         lastblock = sbi->s_last_block;
1952         /* Secondly, we try with converted number of the last block */
1953         ret = udf_scan_anchors(sb, &lastblock, fileset);
1954         if (ret < 0) {
1955                 /* VARCONV didn't help. Clear it. */
1956                 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
1957         }
1958 out:
1959         if (ret == 0)
1960                 sbi->s_last_block = lastblock;
1961         return ret;
1962 }
1963
1964 /*
1965  * Check Volume Structure Descriptor, find Anchor block and load Volume
1966  * Descriptor Sequence.
1967  *
1968  * Returns < 0 on error, 0 on success. -EAGAIN is special meaning anchor
1969  * block was not found.
1970  */
1971 static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
1972                         int silent, struct kernel_lb_addr *fileset)
1973 {
1974         struct udf_sb_info *sbi = UDF_SB(sb);
1975         int nsr = 0;
1976         int ret;
1977
1978         if (!sb_set_blocksize(sb, uopt->blocksize)) {
1979                 if (!silent)
1980                         udf_warn(sb, "Bad block size\n");
1981                 return -EINVAL;
1982         }
1983         sbi->s_last_block = uopt->lastblock;
1984         if (!uopt->novrs) {
1985                 /* Check that it is NSR02 compliant */
1986                 nsr = udf_check_vsd(sb);
1987                 if (!nsr) {
1988                         if (!silent)
1989                                 udf_warn(sb, "No VRS found\n");
1990                         return -EINVAL;
1991                 }
1992                 if (nsr == -1)
1993                         udf_debug("Failed to read sector at offset %d. "
1994                                   "Assuming open disc. Skipping validity "
1995                                   "check\n", VSD_FIRST_SECTOR_OFFSET);
1996                 if (!sbi->s_last_block)
1997                         sbi->s_last_block = udf_get_last_block(sb);
1998         } else {
1999                 udf_debug("Validity check skipped because of novrs option\n");
2000         }
2001
2002         /* Look for anchor block and load Volume Descriptor Sequence */
2003         sbi->s_anchor = uopt->anchor;
2004         ret = udf_find_anchor(sb, fileset);
2005         if (ret < 0) {
2006                 if (!silent && ret == -EAGAIN)
2007                         udf_warn(sb, "No anchor found\n");
2008                 return ret;
2009         }
2010         return 0;
2011 }
2012
2013 static void udf_finalize_lvid(struct logicalVolIntegrityDesc *lvid)
2014 {
2015         struct timespec64 ts;
2016
2017         ktime_get_real_ts64(&ts);
2018         udf_time_to_disk_stamp(&lvid->recordingDateAndTime, ts);
2019         lvid->descTag.descCRC = cpu_to_le16(
2020                 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
2021                         le16_to_cpu(lvid->descTag.descCRCLength)));
2022         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
2023 }
2024
2025 static void udf_open_lvid(struct super_block *sb)
2026 {
2027         struct udf_sb_info *sbi = UDF_SB(sb);
2028         struct buffer_head *bh = sbi->s_lvid_bh;
2029         struct logicalVolIntegrityDesc *lvid;
2030         struct logicalVolIntegrityDescImpUse *lvidiu;
2031
2032         if (!bh)
2033                 return;
2034         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
2035         lvidiu = udf_sb_lvidiu(sb);
2036         if (!lvidiu)
2037                 return;
2038
2039         mutex_lock(&sbi->s_alloc_mutex);
2040         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
2041         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
2042         if (le32_to_cpu(lvid->integrityType) == LVID_INTEGRITY_TYPE_CLOSE)
2043                 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN);
2044         else
2045                 UDF_SET_FLAG(sb, UDF_FLAG_INCONSISTENT);
2046
2047         udf_finalize_lvid(lvid);
2048         mark_buffer_dirty(bh);
2049         sbi->s_lvid_dirty = 0;
2050         mutex_unlock(&sbi->s_alloc_mutex);
2051         /* Make opening of filesystem visible on the media immediately */
2052         sync_dirty_buffer(bh);
2053 }
2054
2055 static void udf_close_lvid(struct super_block *sb)
2056 {
2057         struct udf_sb_info *sbi = UDF_SB(sb);
2058         struct buffer_head *bh = sbi->s_lvid_bh;
2059         struct logicalVolIntegrityDesc *lvid;
2060         struct logicalVolIntegrityDescImpUse *lvidiu;
2061
2062         if (!bh)
2063                 return;
2064         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
2065         lvidiu = udf_sb_lvidiu(sb);
2066         if (!lvidiu)
2067                 return;
2068
2069         mutex_lock(&sbi->s_alloc_mutex);
2070         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
2071         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
2072         if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
2073                 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
2074         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
2075                 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
2076         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
2077                 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
2078         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_INCONSISTENT))
2079                 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
2080
2081         /*
2082          * We set buffer uptodate unconditionally here to avoid spurious
2083          * warnings from mark_buffer_dirty() when previous EIO has marked
2084          * the buffer as !uptodate
2085          */
2086         set_buffer_uptodate(bh);
2087         udf_finalize_lvid(lvid);
2088         mark_buffer_dirty(bh);
2089         sbi->s_lvid_dirty = 0;
2090         mutex_unlock(&sbi->s_alloc_mutex);
2091         /* Make closing of filesystem visible on the media immediately */
2092         sync_dirty_buffer(bh);
2093 }
2094
2095 u64 lvid_get_unique_id(struct super_block *sb)
2096 {
2097         struct buffer_head *bh;
2098         struct udf_sb_info *sbi = UDF_SB(sb);
2099         struct logicalVolIntegrityDesc *lvid;
2100         struct logicalVolHeaderDesc *lvhd;
2101         u64 uniqueID;
2102         u64 ret;
2103
2104         bh = sbi->s_lvid_bh;
2105         if (!bh)
2106                 return 0;
2107
2108         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
2109         lvhd = (struct logicalVolHeaderDesc *)lvid->logicalVolContentsUse;
2110
2111         mutex_lock(&sbi->s_alloc_mutex);
2112         ret = uniqueID = le64_to_cpu(lvhd->uniqueID);
2113         if (!(++uniqueID & 0xFFFFFFFF))
2114                 uniqueID += 16;
2115         lvhd->uniqueID = cpu_to_le64(uniqueID);
2116         udf_updated_lvid(sb);
2117         mutex_unlock(&sbi->s_alloc_mutex);
2118
2119         return ret;
2120 }
2121
2122 static int udf_fill_super(struct super_block *sb, void *options, int silent)
2123 {
2124         int ret = -EINVAL;
2125         struct inode *inode = NULL;
2126         struct udf_options uopt;
2127         struct kernel_lb_addr rootdir, fileset;
2128         struct udf_sb_info *sbi;
2129         bool lvid_open = false;
2130
2131         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
2132         /* By default we'll use overflow[ug]id when UDF inode [ug]id == -1 */
2133         uopt.uid = make_kuid(current_user_ns(), overflowuid);
2134         uopt.gid = make_kgid(current_user_ns(), overflowgid);
2135         uopt.umask = 0;
2136         uopt.fmode = UDF_INVALID_MODE;
2137         uopt.dmode = UDF_INVALID_MODE;
2138         uopt.nls_map = NULL;
2139
2140         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
2141         if (!sbi)
2142                 return -ENOMEM;
2143
2144         sb->s_fs_info = sbi;
2145
2146         mutex_init(&sbi->s_alloc_mutex);
2147
2148         if (!udf_parse_options((char *)options, &uopt, false))
2149                 goto parse_options_failure;
2150
2151         fileset.logicalBlockNum = 0xFFFFFFFF;
2152         fileset.partitionReferenceNum = 0xFFFF;
2153
2154         sbi->s_flags = uopt.flags;
2155         sbi->s_uid = uopt.uid;
2156         sbi->s_gid = uopt.gid;
2157         sbi->s_umask = uopt.umask;
2158         sbi->s_fmode = uopt.fmode;
2159         sbi->s_dmode = uopt.dmode;
2160         sbi->s_nls_map = uopt.nls_map;
2161         rwlock_init(&sbi->s_cred_lock);
2162
2163         if (uopt.session == 0xFFFFFFFF)
2164                 sbi->s_session = udf_get_last_session(sb);
2165         else
2166                 sbi->s_session = uopt.session;
2167
2168         udf_debug("Multi-session=%d\n", sbi->s_session);
2169
2170         /* Fill in the rest of the superblock */
2171         sb->s_op = &udf_sb_ops;
2172         sb->s_export_op = &udf_export_ops;
2173
2174         sb->s_magic = UDF_SUPER_MAGIC;
2175         sb->s_time_gran = 1000;
2176
2177         if (uopt.flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) {
2178                 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
2179         } else {
2180                 uopt.blocksize = bdev_logical_block_size(sb->s_bdev);
2181                 while (uopt.blocksize <= 4096) {
2182                         ret = udf_load_vrs(sb, &uopt, silent, &fileset);
2183                         if (ret < 0) {
2184                                 if (!silent && ret != -EACCES) {
2185                                         pr_notice("Scanning with blocksize %u failed\n",
2186                                                   uopt.blocksize);
2187                                 }
2188                                 brelse(sbi->s_lvid_bh);
2189                                 sbi->s_lvid_bh = NULL;
2190                                 /*
2191                                  * EACCES is special - we want to propagate to
2192                                  * upper layers that we cannot handle RW mount.
2193                                  */
2194                                 if (ret == -EACCES)
2195                                         break;
2196                         } else
2197                                 break;
2198
2199                         uopt.blocksize <<= 1;
2200                 }
2201         }
2202         if (ret < 0) {
2203                 if (ret == -EAGAIN) {
2204                         udf_warn(sb, "No partition found (1)\n");
2205                         ret = -EINVAL;
2206                 }
2207                 goto error_out;
2208         }
2209
2210         udf_debug("Lastblock=%u\n", sbi->s_last_block);
2211
2212         if (sbi->s_lvid_bh) {
2213                 struct logicalVolIntegrityDescImpUse *lvidiu =
2214                                                         udf_sb_lvidiu(sb);
2215                 uint16_t minUDFReadRev;
2216                 uint16_t minUDFWriteRev;
2217
2218                 if (!lvidiu) {
2219                         ret = -EINVAL;
2220                         goto error_out;
2221                 }
2222                 minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
2223                 minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
2224                 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
2225                         udf_err(sb, "minUDFReadRev=%x (max is %x)\n",
2226                                 minUDFReadRev,
2227                                 UDF_MAX_READ_VERSION);
2228                         ret = -EINVAL;
2229                         goto error_out;
2230                 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION) {
2231                         if (!sb_rdonly(sb)) {
2232                                 ret = -EACCES;
2233                                 goto error_out;
2234                         }
2235                         UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT);
2236                 }
2237
2238                 sbi->s_udfrev = minUDFWriteRev;
2239
2240                 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
2241                         UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
2242                 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
2243                         UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
2244         }
2245
2246         if (!sbi->s_partitions) {
2247                 udf_warn(sb, "No partition found (2)\n");
2248                 ret = -EINVAL;
2249                 goto error_out;
2250         }
2251
2252         if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
2253                         UDF_PART_FLAG_READ_ONLY) {
2254                 if (!sb_rdonly(sb)) {
2255                         ret = -EACCES;
2256                         goto error_out;
2257                 }
2258                 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT);
2259         }
2260
2261         ret = udf_find_fileset(sb, &fileset, &rootdir);
2262         if (ret < 0) {
2263                 udf_warn(sb, "No fileset found\n");
2264                 goto error_out;
2265         }
2266
2267         if (!silent) {
2268                 struct timestamp ts;
2269                 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
2270                 udf_info("Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
2271                          sbi->s_volume_ident,
2272                          le16_to_cpu(ts.year), ts.month, ts.day,
2273                          ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
2274         }
2275         if (!sb_rdonly(sb)) {
2276                 udf_open_lvid(sb);
2277                 lvid_open = true;
2278         }
2279
2280         /* Assign the root inode */
2281         /* assign inodes by physical block number */
2282         /* perhaps it's not extensible enough, but for now ... */
2283         inode = udf_iget(sb, &rootdir);
2284         if (IS_ERR(inode)) {
2285                 udf_err(sb, "Error in udf_iget, block=%u, partition=%u\n",
2286                        rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
2287                 ret = PTR_ERR(inode);
2288                 goto error_out;
2289         }
2290
2291         /* Allocate a dentry for the root inode */
2292         sb->s_root = d_make_root(inode);
2293         if (!sb->s_root) {
2294                 udf_err(sb, "Couldn't allocate root dentry\n");
2295                 ret = -ENOMEM;
2296                 goto error_out;
2297         }
2298         sb->s_maxbytes = MAX_LFS_FILESIZE;
2299         sb->s_max_links = UDF_MAX_LINKS;
2300         return 0;
2301
2302 error_out:
2303         iput(sbi->s_vat_inode);
2304 parse_options_failure:
2305         unload_nls(uopt.nls_map);
2306         if (lvid_open)
2307                 udf_close_lvid(sb);
2308         brelse(sbi->s_lvid_bh);
2309         udf_sb_free_partitions(sb);
2310         kfree(sbi);
2311         sb->s_fs_info = NULL;
2312
2313         return ret;
2314 }
2315
2316 void _udf_err(struct super_block *sb, const char *function,
2317               const char *fmt, ...)
2318 {
2319         struct va_format vaf;
2320         va_list args;
2321
2322         va_start(args, fmt);
2323
2324         vaf.fmt = fmt;
2325         vaf.va = &args;
2326
2327         pr_err("error (device %s): %s: %pV", sb->s_id, function, &vaf);
2328
2329         va_end(args);
2330 }
2331
2332 void _udf_warn(struct super_block *sb, const char *function,
2333                const char *fmt, ...)
2334 {
2335         struct va_format vaf;
2336         va_list args;
2337
2338         va_start(args, fmt);
2339
2340         vaf.fmt = fmt;
2341         vaf.va = &args;
2342
2343         pr_warn("warning (device %s): %s: %pV", sb->s_id, function, &vaf);
2344
2345         va_end(args);
2346 }
2347
2348 static void udf_put_super(struct super_block *sb)
2349 {
2350         struct udf_sb_info *sbi;
2351
2352         sbi = UDF_SB(sb);
2353
2354         iput(sbi->s_vat_inode);
2355         unload_nls(sbi->s_nls_map);
2356         if (!sb_rdonly(sb))
2357                 udf_close_lvid(sb);
2358         brelse(sbi->s_lvid_bh);
2359         udf_sb_free_partitions(sb);
2360         mutex_destroy(&sbi->s_alloc_mutex);
2361         kfree(sb->s_fs_info);
2362         sb->s_fs_info = NULL;
2363 }
2364
2365 static int udf_sync_fs(struct super_block *sb, int wait)
2366 {
2367         struct udf_sb_info *sbi = UDF_SB(sb);
2368
2369         mutex_lock(&sbi->s_alloc_mutex);
2370         if (sbi->s_lvid_dirty) {
2371                 struct buffer_head *bh = sbi->s_lvid_bh;
2372                 struct logicalVolIntegrityDesc *lvid;
2373
2374                 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
2375                 udf_finalize_lvid(lvid);
2376
2377                 /*
2378                  * Blockdevice will be synced later so we don't have to submit
2379                  * the buffer for IO
2380                  */
2381                 mark_buffer_dirty(bh);
2382                 sbi->s_lvid_dirty = 0;
2383         }
2384         mutex_unlock(&sbi->s_alloc_mutex);
2385
2386         return 0;
2387 }
2388
2389 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
2390 {
2391         struct super_block *sb = dentry->d_sb;
2392         struct udf_sb_info *sbi = UDF_SB(sb);
2393         struct logicalVolIntegrityDescImpUse *lvidiu;
2394         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
2395
2396         lvidiu = udf_sb_lvidiu(sb);
2397         buf->f_type = UDF_SUPER_MAGIC;
2398         buf->f_bsize = sb->s_blocksize;
2399         buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
2400         buf->f_bfree = udf_count_free(sb);
2401         buf->f_bavail = buf->f_bfree;
2402         /*
2403          * Let's pretend each free block is also a free 'inode' since UDF does
2404          * not have separate preallocated table of inodes.
2405          */
2406         buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2407                                           le32_to_cpu(lvidiu->numDirs)) : 0)
2408                         + buf->f_bfree;
2409         buf->f_ffree = buf->f_bfree;
2410         buf->f_namelen = UDF_NAME_LEN;
2411         buf->f_fsid = u64_to_fsid(id);
2412
2413         return 0;
2414 }
2415
2416 static unsigned int udf_count_free_bitmap(struct super_block *sb,
2417                                           struct udf_bitmap *bitmap)
2418 {
2419         struct buffer_head *bh = NULL;
2420         unsigned int accum = 0;
2421         int index;
2422         udf_pblk_t block = 0, newblock;
2423         struct kernel_lb_addr loc;
2424         uint32_t bytes;
2425         uint8_t *ptr;
2426         uint16_t ident;
2427         struct spaceBitmapDesc *bm;
2428
2429         loc.logicalBlockNum = bitmap->s_extPosition;
2430         loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
2431         bh = udf_read_ptagged(sb, &loc, 0, &ident);
2432
2433         if (!bh) {
2434                 udf_err(sb, "udf_count_free failed\n");
2435                 goto out;
2436         } else if (ident != TAG_IDENT_SBD) {
2437                 brelse(bh);
2438                 udf_err(sb, "udf_count_free failed\n");
2439                 goto out;
2440         }
2441
2442         bm = (struct spaceBitmapDesc *)bh->b_data;
2443         bytes = le32_to_cpu(bm->numOfBytes);
2444         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2445         ptr = (uint8_t *)bh->b_data;
2446
2447         while (bytes > 0) {
2448                 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2449                 accum += bitmap_weight((const unsigned long *)(ptr + index),
2450                                         cur_bytes * 8);
2451                 bytes -= cur_bytes;
2452                 if (bytes) {
2453                         brelse(bh);
2454                         newblock = udf_get_lb_pblock(sb, &loc, ++block);
2455                         bh = udf_tread(sb, newblock);
2456                         if (!bh) {
2457                                 udf_debug("read failed\n");
2458                                 goto out;
2459                         }
2460                         index = 0;
2461                         ptr = (uint8_t *)bh->b_data;
2462                 }
2463         }
2464         brelse(bh);
2465 out:
2466         return accum;
2467 }
2468
2469 static unsigned int udf_count_free_table(struct super_block *sb,
2470                                          struct inode *table)
2471 {
2472         unsigned int accum = 0;
2473         uint32_t elen;
2474         struct kernel_lb_addr eloc;
2475         int8_t etype;
2476         struct extent_position epos;
2477
2478         mutex_lock(&UDF_SB(sb)->s_alloc_mutex);
2479         epos.block = UDF_I(table)->i_location;
2480         epos.offset = sizeof(struct unallocSpaceEntry);
2481         epos.bh = NULL;
2482
2483         while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2484                 accum += (elen >> table->i_sb->s_blocksize_bits);
2485
2486         brelse(epos.bh);
2487         mutex_unlock(&UDF_SB(sb)->s_alloc_mutex);
2488
2489         return accum;
2490 }
2491
2492 static unsigned int udf_count_free(struct super_block *sb)
2493 {
2494         unsigned int accum = 0;
2495         struct udf_sb_info *sbi = UDF_SB(sb);
2496         struct udf_part_map *map;
2497         unsigned int part = sbi->s_partition;
2498         int ptype = sbi->s_partmaps[part].s_partition_type;
2499
2500         if (ptype == UDF_METADATA_MAP25) {
2501                 part = sbi->s_partmaps[part].s_type_specific.s_metadata.
2502                                                         s_phys_partition_ref;
2503         } else if (ptype == UDF_VIRTUAL_MAP15 || ptype == UDF_VIRTUAL_MAP20) {
2504                 /*
2505                  * Filesystems with VAT are append-only and we cannot write to
2506                  * them. Let's just report 0 here.
2507                  */
2508                 return 0;
2509         }
2510
2511         if (sbi->s_lvid_bh) {
2512                 struct logicalVolIntegrityDesc *lvid =
2513                         (struct logicalVolIntegrityDesc *)
2514                         sbi->s_lvid_bh->b_data;
2515                 if (le32_to_cpu(lvid->numOfPartitions) > part) {
2516                         accum = le32_to_cpu(
2517                                         lvid->freeSpaceTable[part]);
2518                         if (accum == 0xFFFFFFFF)
2519                                 accum = 0;
2520                 }
2521         }
2522
2523         if (accum)
2524                 return accum;
2525
2526         map = &sbi->s_partmaps[part];
2527         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2528                 accum += udf_count_free_bitmap(sb,
2529                                                map->s_uspace.s_bitmap);
2530         }
2531         if (accum)
2532                 return accum;
2533
2534         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2535                 accum += udf_count_free_table(sb,
2536                                               map->s_uspace.s_table);
2537         }
2538         return accum;
2539 }
2540
2541 MODULE_AUTHOR("Ben Fennema");
2542 MODULE_DESCRIPTION("Universal Disk Format Filesystem");
2543 MODULE_LICENSE("GPL");
2544 module_init(init_udf_fs)
2545 module_exit(exit_udf_fs)