fs/udf/super.c

   1 /*
   2  * super.c
   3  *
   4  * PURPOSE
   5  *  Super block routines for the OSTA-UDF(tm) filesystem.
   6  *
   7  * DESCRIPTION
   8  *  OSTA-UDF(tm) = Optical Storage Technology Association
   9  *  Universal Disk Format.
  10  *
  11  *  This code is based on version 2.00 of the UDF specification,
  12  *  and revision 3 of the ECMA 167 standard [equivalent to ISO 13346].
  13  *    http://www.osta.org/
  14  *    http://www.ecma.ch/
  15  *    http://www.iso.org/
  16  *
  17  * COPYRIGHT
  18  *  This file is distributed under the terms of the GNU General Public
  19  *  License (GPL). Copies of the GPL can be obtained from:
  20  *    ftp://prep.ai.mit.edu/pub/gnu/GPL
  21  *  Each contributing author retains all rights to their own work.
  22  *
  23  *  (C) 1998 Dave Boynton
  24  *  (C) 1998-2004 Ben Fennema
  25  *  (C) 2000 Stelias Computing Inc
  26  *
  27  * HISTORY
  28  *
  29  *  09/24/98 dgb  changed to allow compiling outside of kernel, and
  30  *                added some debugging.
  31  *  10/01/98 dgb  updated to allow (some) possibility of compiling w/2.0.34
  32  *  10/16/98      attempting some multi-session support
  33  *  10/17/98      added freespace count for "df"
  34  *  11/11/98 gr   added novrs option
  35  *  11/26/98 dgb  added fileset,anchor mount options
  36  *  12/06/98 blf  really hosed things royally. vat/sparing support. sequenced
  37  *                vol descs. rewrote option handling based on isofs
  38  *  12/20/98      find the free space bitmap (if it exists)
  39  */
  40
  41 #include "udfdecl.h"
  42
  43 #include <linux/blkdev.h>
  44 #include <linux/slab.h>
  45 #include <linux/kernel.h>
  46 #include <linux/module.h>
  47 #include <linux/parser.h>
  48 #include <linux/stat.h>
  49 #include <linux/cdrom.h>
  50 #include <linux/nls.h>
  51 #include <linux/vfs.h>
  52 #include <linux/vmalloc.h>
  53 #include <linux/errno.h>
  54 #include <linux/mount.h>
  55 #include <linux/seq_file.h>
  56 #include <linux/bitmap.h>
  57 #include <linux/crc-itu-t.h>
  58 #include <linux/log2.h>
  59 #include <asm/byteorder.h>
  60
  61 #include "udf_sb.h"
  62 #include "udf_i.h"
  63
  64 #include <linux/init.h>
  65 #include <linux/uaccess.h>
  66
  67 #define VDS_POS_PRIMARY_VOL_DESC        0
  68 #define VDS_POS_UNALLOC_SPACE_DESC      1
  69 #define VDS_POS_LOGICAL_VOL_DESC        2
  70 #define VDS_POS_PARTITION_DESC          3
  71 #define VDS_POS_IMP_USE_VOL_DESC        4
  72 #define VDS_POS_VOL_DESC_PTR            5
  73 #define VDS_POS_TERMINATING_DESC        6
  74 #define VDS_POS_LENGTH                  7
  75
  76 #define VSD_FIRST_SECTOR_OFFSET         32768
  77 #define VSD_MAX_SECTOR_OFFSET           0x800000
  78
  79 /*
  80  * Maximum number of Terminating Descriptor / Logical Volume Integrity
  81  * Descriptor redirections. The chosen numbers are arbitrary - just that we
  82  * hopefully don't limit any real use of rewritten inode on write-once media
  83  * but avoid looping for too long on corrupted media.
  84  */
  85 #define UDF_MAX_TD_NESTING 64
  86 #define UDF_MAX_LVID_NESTING 1000
  87
  88 enum { UDF_MAX_LINKS = 0xffff };
  89
  90 /* These are the "meat" - everything else is stuffing */
  91 static int udf_fill_super(struct super_block *, void *, int);
  92 static void udf_put_super(struct super_block *);
  93 static int udf_sync_fs(struct super_block *, int);
  94 static int udf_remount_fs(struct super_block *, int *, char *);
  95 static void udf_load_logicalvolint(struct super_block *, struct kernel_extent_ad);
  96 static int udf_find_fileset(struct super_block *, struct kernel_lb_addr *,
  97                             struct kernel_lb_addr *);
  98 static void udf_load_fileset(struct super_block *, struct buffer_head *,
  99                              struct kernel_lb_addr *);
 100 static void udf_open_lvid(struct super_block *);
 101 static void udf_close_lvid(struct super_block *);
 102 static unsigned int udf_count_free(struct super_block *);
 103 static int udf_statfs(struct dentry *, struct kstatfs *);
 104 static int udf_show_options(struct seq_file *, struct dentry *);
 105
 106 struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct super_block *sb)
 107 {
 108         struct logicalVolIntegrityDesc *lvid;
 109         unsigned int partnum;
 110         unsigned int offset;
 111
 112         if (!UDF_SB(sb)->s_lvid_bh)
 113                 return NULL;
 114         lvid = (struct logicalVolIntegrityDesc *)UDF_SB(sb)->s_lvid_bh->b_data;
 115         partnum = le32_to_cpu(lvid->numOfPartitions);
 116         /* The offset is to skip freeSpaceTable and sizeTable arrays */
 117         offset = partnum * 2 * sizeof(uint32_t);
 118         return (struct logicalVolIntegrityDescImpUse *)
 119                                         (((uint8_t *)(lvid + 1)) + offset);
 120 }
 121
 122 /* UDF filesystem type */
 123 static struct dentry *udf_mount(struct file_system_type *fs_type,
 124                       int flags, const char *dev_name, void *data)
 125 {
 126         return mount_bdev(fs_type, flags, dev_name, data, udf_fill_super);
 127 }
 128
 129 static struct file_system_type udf_fstype = {
 130         .owner          = THIS_MODULE,
 131         .name           = "udf",
 132         .mount          = udf_mount,
 133         .kill_sb        = kill_block_super,
 134         .fs_flags       = FS_REQUIRES_DEV,
 135 };
 136 MODULE_ALIAS_FS("udf");
 137
 138 static struct kmem_cache *udf_inode_cachep;
 139
 140 static struct inode *udf_alloc_inode(struct super_block *sb)
 141 {
 142         struct udf_inode_info *ei;
 143         ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
 144         if (!ei)
 145                 return NULL;
 146
 147         ei->i_unique = 0;
 148         ei->i_lenExtents = 0;
 149         ei->i_next_alloc_block = 0;
 150         ei->i_next_alloc_goal = 0;
 151         ei->i_strat4096 = 0;
 152         init_rwsem(&ei->i_data_sem);
 153         ei->cached_extent.lstart = -1;
 154         spin_lock_init(&ei->i_extent_cache_lock);
 155
 156         return &ei->vfs_inode;
 157 }
 158
 159 static void udf_i_callback(struct rcu_head *head)
 160 {
 161         struct inode *inode = container_of(head, struct inode, i_rcu);
 162         kmem_cache_free(udf_inode_cachep, UDF_I(inode));
 163 }
 164
 165 static void udf_destroy_inode(struct inode *inode)
 166 {
 167         call_rcu(&inode->i_rcu, udf_i_callback);
 168 }
 169
 170 static void init_once(void *foo)
 171 {
 172         struct udf_inode_info *ei = (struct udf_inode_info *)foo;
 173
 174         ei->i_ext.i_data = NULL;
 175         inode_init_once(&ei->vfs_inode);
 176 }
 177
 178 static int __init init_inodecache(void)
 179 {
 180         udf_inode_cachep = kmem_cache_create("udf_inode_cache",
 181                                              sizeof(struct udf_inode_info),
 182                                              0, (SLAB_RECLAIM_ACCOUNT |
 183                                                  SLAB_MEM_SPREAD |
 184                                                  SLAB_ACCOUNT),
 185                                              init_once);
 186         if (!udf_inode_cachep)
 187                 return -ENOMEM;
 188         return 0;
 189 }
 190
 191 static void destroy_inodecache(void)
 192 {
 193         /*
 194          * Make sure all delayed rcu free inodes are flushed before we
 195          * destroy cache.
 196          */
 197         rcu_barrier();
 198         kmem_cache_destroy(udf_inode_cachep);
 199 }
 200
 201 /* Superblock operations */
 202 static const struct super_operations udf_sb_ops = {
 203         .alloc_inode    = udf_alloc_inode,
 204         .destroy_inode  = udf_destroy_inode,
 205         .write_inode    = udf_write_inode,
 206         .evict_inode    = udf_evict_inode,
 207         .put_super      = udf_put_super,
 208         .sync_fs        = udf_sync_fs,
 209         .statfs         = udf_statfs,
 210         .remount_fs     = udf_remount_fs,
 211         .show_options   = udf_show_options,
 212 };
 213
 214 struct udf_options {
 215         unsigned char novrs;
 216         unsigned int blocksize;
 217         unsigned int session;
 218         unsigned int lastblock;
 219         unsigned int anchor;
 220         unsigned int volume;
 221         unsigned short partition;
 222         unsigned int fileset;
 223         unsigned int rootdir;
 224         unsigned int flags;
 225         umode_t umask;
 226         kgid_t gid;
 227         kuid_t uid;
 228         umode_t fmode;
 229         umode_t dmode;
 230         struct nls_table *nls_map;
 231 };
 232
 233 static int __init init_udf_fs(void)
 234 {
 235         int err;
 236
 237         err = init_inodecache();
 238         if (err)
 239                 goto out1;
 240         err = register_filesystem(&udf_fstype);
 241         if (err)
 242                 goto out;
 243
 244         return 0;
 245
 246 out:
 247         destroy_inodecache();
 248
 249 out1:
 250         return err;
 251 }
 252
 253 static void __exit exit_udf_fs(void)
 254 {
 255         unregister_filesystem(&udf_fstype);
 256         destroy_inodecache();
 257 }
 258
 259 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
 260 {
 261         struct udf_sb_info *sbi = UDF_SB(sb);
 262
 263         sbi->s_partmaps = kcalloc(count, sizeof(*sbi->s_partmaps), GFP_KERNEL);
 264         if (!sbi->s_partmaps) {
 265                 sbi->s_partitions = 0;
 266                 return -ENOMEM;
 267         }
 268
 269         sbi->s_partitions = count;
 270         return 0;
 271 }
 272
 273 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
 274 {
 275         int i;
 276         int nr_groups = bitmap->s_nr_groups;
 277
 278         for (i = 0; i < nr_groups; i++)
 279                 if (bitmap->s_block_bitmap[i])
 280                         brelse(bitmap->s_block_bitmap[i]);
 281
 282         kvfree(bitmap);
 283 }
 284
 285 static void udf_free_partition(struct udf_part_map *map)
 286 {
 287         int i;
 288         struct udf_meta_data *mdata;
 289
 290         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
 291                 iput(map->s_uspace.s_table);
 292         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
 293                 iput(map->s_fspace.s_table);
 294         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
 295                 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
 296         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
 297                 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
 298         if (map->s_partition_type == UDF_SPARABLE_MAP15)
 299                 for (i = 0; i < 4; i++)
 300                         brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
 301         else if (map->s_partition_type == UDF_METADATA_MAP25) {
 302                 mdata = &map->s_type_specific.s_metadata;
 303                 iput(mdata->s_metadata_fe);
 304                 mdata->s_metadata_fe = NULL;
 305
 306                 iput(mdata->s_mirror_fe);
 307                 mdata->s_mirror_fe = NULL;
 308
 309                 iput(mdata->s_bitmap_fe);
 310                 mdata->s_bitmap_fe = NULL;
 311         }
 312 }
 313
 314 static void udf_sb_free_partitions(struct super_block *sb)
 315 {
 316         struct udf_sb_info *sbi = UDF_SB(sb);
 317         int i;
 318
 319         if (!sbi->s_partmaps)
 320                 return;
 321         for (i = 0; i < sbi->s_partitions; i++)
 322                 udf_free_partition(&sbi->s_partmaps[i]);
 323         kfree(sbi->s_partmaps);
 324         sbi->s_partmaps = NULL;
 325 }
 326
 327 static int udf_show_options(struct seq_file *seq, struct dentry *root)
 328 {
 329         struct super_block *sb = root->d_sb;
 330         struct udf_sb_info *sbi = UDF_SB(sb);
 331
 332         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
 333                 seq_puts(seq, ",nostrict");
 334         if (UDF_QUERY_FLAG(sb, UDF_FLAG_BLOCKSIZE_SET))
 335                 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
 336         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
 337                 seq_puts(seq, ",unhide");
 338         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
 339                 seq_puts(seq, ",undelete");
 340         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
 341                 seq_puts(seq, ",noadinicb");
 342         if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
 343                 seq_puts(seq, ",shortad");
 344         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
 345                 seq_puts(seq, ",uid=forget");
 346         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_IGNORE))
 347                 seq_puts(seq, ",uid=ignore");
 348         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
 349                 seq_puts(seq, ",gid=forget");
 350         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE))
 351                 seq_puts(seq, ",gid=ignore");
 352         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
 353                 seq_printf(seq, ",uid=%u", from_kuid(&init_user_ns, sbi->s_uid));
 354         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
 355                 seq_printf(seq, ",gid=%u", from_kgid(&init_user_ns, sbi->s_gid));
 356         if (sbi->s_umask != 0)
 357                 seq_printf(seq, ",umask=%ho", sbi->s_umask);
 358         if (sbi->s_fmode != UDF_INVALID_MODE)
 359                 seq_printf(seq, ",mode=%ho", sbi->s_fmode);
 360         if (sbi->s_dmode != UDF_INVALID_MODE)
 361                 seq_printf(seq, ",dmode=%ho", sbi->s_dmode);
 362         if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
 363                 seq_printf(seq, ",session=%u", sbi->s_session);
 364         if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
 365                 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
 366         if (sbi->s_anchor != 0)
 367                 seq_printf(seq, ",anchor=%u", sbi->s_anchor);
 368         /*
 369          * volume, partition, fileset and rootdir seem to be ignored
 370          * currently
 371          */
 372         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
 373                 seq_puts(seq, ",utf8");
 374         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
 375                 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
 376
 377         return 0;
 378 }
 379
 380 /*
 381  * udf_parse_options
 382  *
 383  * PURPOSE
 384  *      Parse mount options.
 385  *
 386  * DESCRIPTION
 387  *      The following mount options are supported:
 388  *
 389  *      gid=            Set the default group.
 390  *      umask=          Set the default umask.
 391  *      mode=           Set the default file permissions.
 392  *      dmode=          Set the default directory permissions.
 393  *      uid=            Set the default user.
 394  *      bs=             Set the block size.
 395  *      unhide          Show otherwise hidden files.
 396  *      undelete        Show deleted files in lists.
 397  *      adinicb         Embed data in the inode (default)
 398  *      noadinicb       Don't embed data in the inode
 399  *      shortad         Use short ad's
 400  *      longad          Use long ad's (default)
 401  *      nostrict        Unset strict conformance
 402  *      iocharset=      Set the NLS character set
 403  *
 404  *      The remaining are for debugging and disaster recovery:
 405  *
 406  *      novrs           Skip volume sequence recognition
 407  *
 408  *      The following expect a offset from 0.
 409  *
 410  *      session=        Set the CDROM session (default= last session)
 411  *      anchor=         Override standard anchor location. (default= 256)
 412  *      volume=         Override the VolumeDesc location. (unused)
 413  *      partition=      Override the PartitionDesc location. (unused)
 414  *      lastblock=      Set the last block of the filesystem/
 415  *
 416  *      The following expect a offset from the partition root.
 417  *
 418  *      fileset=        Override the fileset block location. (unused)
 419  *      rootdir=        Override the root directory location. (unused)
 420  *              WARNING: overriding the rootdir to a non-directory may
 421  *              yield highly unpredictable results.
 422  *
 423  * PRE-CONDITIONS
 424  *      options         Pointer to mount options string.
 425  *      uopts           Pointer to mount options variable.
 426  *
 427  * POST-CONDITIONS
 428  *      <return>        1       Mount options parsed okay.
 429  *      <return>        0       Error parsing mount options.
 430  *
 431  * HISTORY
 432  *      July 1, 1997 - Andrew E. Mileski
 433  *      Written, tested, and released.
 434  */
 435
 436 enum {
 437         Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
 438         Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
 439         Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
 440         Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
 441         Opt_rootdir, Opt_utf8, Opt_iocharset,
 442         Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore,
 443         Opt_fmode, Opt_dmode
 444 };
 445
 446 static const match_table_t tokens = {
 447         {Opt_novrs,     "novrs"},
 448         {Opt_nostrict,  "nostrict"},
 449         {Opt_bs,        "bs=%u"},
 450         {Opt_unhide,    "unhide"},
 451         {Opt_undelete,  "undelete"},
 452         {Opt_noadinicb, "noadinicb"},
 453         {Opt_adinicb,   "adinicb"},
 454         {Opt_shortad,   "shortad"},
 455         {Opt_longad,    "longad"},
 456         {Opt_uforget,   "uid=forget"},
 457         {Opt_uignore,   "uid=ignore"},
 458         {Opt_gforget,   "gid=forget"},
 459         {Opt_gignore,   "gid=ignore"},
 460         {Opt_gid,       "gid=%u"},
 461         {Opt_uid,       "uid=%u"},
 462         {Opt_umask,     "umask=%o"},
 463         {Opt_session,   "session=%u"},
 464         {Opt_lastblock, "lastblock=%u"},
 465         {Opt_anchor,    "anchor=%u"},
 466         {Opt_volume,    "volume=%u"},
 467         {Opt_partition, "partition=%u"},
 468         {Opt_fileset,   "fileset=%u"},
 469         {Opt_rootdir,   "rootdir=%u"},
 470         {Opt_utf8,      "utf8"},
 471         {Opt_iocharset, "iocharset=%s"},
 472         {Opt_fmode,     "mode=%o"},
 473         {Opt_dmode,     "dmode=%o"},
 474         {Opt_err,       NULL}
 475 };
 476
 477 static int udf_parse_options(char *options, struct udf_options *uopt,
 478                              bool remount)
 479 {
 480         char *p;
 481         int option;
 482
 483         uopt->novrs = 0;
 484         uopt->partition = 0xFFFF;
 485         uopt->session = 0xFFFFFFFF;
 486         uopt->lastblock = 0;
 487         uopt->anchor = 0;
 488         uopt->volume = 0xFFFFFFFF;
 489         uopt->rootdir = 0xFFFFFFFF;
 490         uopt->fileset = 0xFFFFFFFF;
 491         uopt->nls_map = NULL;
 492
 493         if (!options)
 494                 return 1;
 495
 496         while ((p = strsep(&options, ",")) != NULL) {
 497                 substring_t args[MAX_OPT_ARGS];
 498                 int token;
 499                 unsigned n;
 500                 if (!*p)
 501                         continue;
 502
 503                 token = match_token(p, tokens, args);
 504                 switch (token) {
 505                 case Opt_novrs:
 506                         uopt->novrs = 1;
 507                         break;
 508                 case Opt_bs:
 509                         if (match_int(&args[0], &option))
 510                                 return 0;
 511                         n = option;
 512                         if (n != 512 && n != 1024 && n != 2048 && n != 4096)
 513                                 return 0;
 514                         uopt->blocksize = n;
 515                         uopt->flags |= (1 << UDF_FLAG_BLOCKSIZE_SET);
 516                         break;
 517                 case Opt_unhide:
 518                         uopt->flags |= (1 << UDF_FLAG_UNHIDE);
 519                         break;
 520                 case Opt_undelete:
 521                         uopt->flags |= (1 << UDF_FLAG_UNDELETE);
 522                         break;
 523                 case Opt_noadinicb:
 524                         uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
 525                         break;
 526                 case Opt_adinicb:
 527                         uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
 528                         break;
 529                 case Opt_shortad:
 530                         uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
 531                         break;
 532                 case Opt_longad:
 533                         uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
 534                         break;
 535                 case Opt_gid:
 536                         if (match_int(args, &option))
 537                                 return 0;
 538                         uopt->gid = make_kgid(current_user_ns(), option);
 539                         if (!gid_valid(uopt->gid))
 540                                 return 0;
 541                         uopt->flags |= (1 << UDF_FLAG_GID_SET);
 542                         break;
 543                 case Opt_uid:
 544                         if (match_int(args, &option))
 545                                 return 0;
 546                         uopt->uid = make_kuid(current_user_ns(), option);
 547                         if (!uid_valid(uopt->uid))
 548                                 return 0;
 549                         uopt->flags |= (1 << UDF_FLAG_UID_SET);
 550                         break;
 551                 case Opt_umask:
 552                         if (match_octal(args, &option))
 553                                 return 0;
 554                         uopt->umask = option;
 555                         break;
 556                 case Opt_nostrict:
 557                         uopt->flags &= ~(1 << UDF_FLAG_STRICT);
 558                         break;
 559                 case Opt_session:
 560                         if (match_int(args, &option))
 561                                 return 0;
 562                         uopt->session = option;
 563                         if (!remount)
 564                                 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
 565                         break;
 566                 case Opt_lastblock:
 567                         if (match_int(args, &option))
 568                                 return 0;
 569                         uopt->lastblock = option;
 570                         if (!remount)
 571                                 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
 572                         break;
 573                 case Opt_anchor:
 574                         if (match_int(args, &option))
 575                                 return 0;
 576                         uopt->anchor = option;
 577                         break;
 578                 case Opt_volume:
 579                         if (match_int(args, &option))
 580                                 return 0;
 581                         uopt->volume = option;
 582                         break;
 583                 case Opt_partition:
 584                         if (match_int(args, &option))
 585                                 return 0;
 586                         uopt->partition = option;
 587                         break;
 588                 case Opt_fileset:
 589                         if (match_int(args, &option))
 590                                 return 0;
 591                         uopt->fileset = option;
 592                         break;
 593                 case Opt_rootdir:
 594                         if (match_int(args, &option))
 595                                 return 0;
 596                         uopt->rootdir = option;
 597                         break;
 598                 case Opt_utf8:
 599                         uopt->flags |= (1 << UDF_FLAG_UTF8);
 600                         break;
 601 #ifdef CONFIG_UDF_NLS
 602                 case Opt_iocharset:
 603                         uopt->nls_map = load_nls(args[0].from);
 604                         uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
 605                         break;
 606 #endif
 607                 case Opt_uignore:
 608                         uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
 609                         break;
 610                 case Opt_uforget:
 611                         uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
 612                         break;
 613                 case Opt_gignore:
 614                         uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
 615                         break;
 616                 case Opt_gforget:
 617                         uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
 618                         break;
 619                 case Opt_fmode:
 620                         if (match_octal(args, &option))
 621                                 return 0;
 622                         uopt->fmode = option & 0777;
 623                         break;
 624                 case Opt_dmode:
 625                         if (match_octal(args, &option))
 626                                 return 0;
 627                         uopt->dmode = option & 0777;
 628                         break;
 629                 default:
 630                         pr_err("bad mount option \"%s\" or missing value\n", p);
 631                         return 0;
 632                 }
 633         }
 634         return 1;
 635 }
 636
 637 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
 638 {
 639         struct udf_options uopt;
 640         struct udf_sb_info *sbi = UDF_SB(sb);
 641         int error = 0;
 642         struct logicalVolIntegrityDescImpUse *lvidiu = udf_sb_lvidiu(sb);
 643
 644         sync_filesystem(sb);
 645         if (lvidiu) {
 646                 int write_rev = le16_to_cpu(lvidiu->minUDFWriteRev);
 647                 if (write_rev > UDF_MAX_WRITE_VERSION && !(*flags & MS_RDONLY))
 648                         return -EACCES;
 649         }
 650
 651         uopt.flags = sbi->s_flags;
 652         uopt.uid   = sbi->s_uid;
 653         uopt.gid   = sbi->s_gid;
 654         uopt.umask = sbi->s_umask;
 655         uopt.fmode = sbi->s_fmode;
 656         uopt.dmode = sbi->s_dmode;
 657
 658         if (!udf_parse_options(options, &uopt, true))
 659                 return -EINVAL;
 660
 661         write_lock(&sbi->s_cred_lock);
 662         sbi->s_flags = uopt.flags;
 663         sbi->s_uid   = uopt.uid;
 664         sbi->s_gid   = uopt.gid;
 665         sbi->s_umask = uopt.umask;
 666         sbi->s_fmode = uopt.fmode;
 667         sbi->s_dmode = uopt.dmode;
 668         write_unlock(&sbi->s_cred_lock);
 669
 670         if ((bool)(*flags & MS_RDONLY) == sb_rdonly(sb))
 671                 goto out_unlock;
 672
 673         if (*flags & MS_RDONLY)
 674                 udf_close_lvid(sb);
 675         else
 676                 udf_open_lvid(sb);
 677
 678 out_unlock:
 679         return error;
 680 }
 681
 682 /* Check Volume Structure Descriptors (ECMA 167 2/9.1) */
 683 /* We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
 684 static loff_t udf_check_vsd(struct super_block *sb)
 685 {
 686         struct volStructDesc *vsd = NULL;
 687         loff_t sector = VSD_FIRST_SECTOR_OFFSET;
 688         int sectorsize;
 689         struct buffer_head *bh = NULL;
 690         int nsr02 = 0;
 691         int nsr03 = 0;
 692         struct udf_sb_info *sbi;
 693
 694         sbi = UDF_SB(sb);
 695         if (sb->s_blocksize < sizeof(struct volStructDesc))
 696                 sectorsize = sizeof(struct volStructDesc);
 697         else
 698                 sectorsize = sb->s_blocksize;
 699
 700         sector += (((loff_t)sbi->s_session) << sb->s_blocksize_bits);
 701
 702         udf_debug("Starting at sector %u (%ld byte sectors)\n",
 703                   (unsigned int)(sector >> sb->s_blocksize_bits),
 704                   sb->s_blocksize);
 705         /* Process the sequence (if applicable). The hard limit on the sector
 706          * offset is arbitrary, hopefully large enough so that all valid UDF
 707          * filesystems will be recognised. There is no mention of an upper
 708          * bound to the size of the volume recognition area in the standard.
 709          *  The limit will prevent the code to read all the sectors of a
 710          * specially crafted image (like a bluray disc full of CD001 sectors),
 711          * potentially causing minutes or even hours of uninterruptible I/O
 712          * activity. This actually happened with uninitialised SSD partitions
 713          * (all 0xFF) before the check for the limit and all valid IDs were
 714          * added */
 715         for (; !nsr02 && !nsr03 && sector < VSD_MAX_SECTOR_OFFSET;
 716              sector += sectorsize) {
 717                 /* Read a block */
 718                 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
 719                 if (!bh)
 720                         break;
 721
 722                 /* Look for ISO  descriptors */
 723                 vsd = (struct volStructDesc *)(bh->b_data +
 724                                               (sector & (sb->s_blocksize - 1)));
 725
 726                 if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
 727                                     VSD_STD_ID_LEN)) {
 728                         switch (vsd->structType) {
 729                         case 0:
 730                                 udf_debug("ISO9660 Boot Record found\n");
 731                                 break;
 732                         case 1:
 733                                 udf_debug("ISO9660 Primary Volume Descriptor found\n");
 734                                 break;
 735                         case 2:
 736                                 udf_debug("ISO9660 Supplementary Volume Descriptor found\n");
 737                                 break;
 738                         case 3:
 739                                 udf_debug("ISO9660 Volume Partition Descriptor found\n");
 740                                 break;
 741                         case 255:
 742                                 udf_debug("ISO9660 Volume Descriptor Set Terminator found\n");
 743                                 break;
 744                         default:
 745                                 udf_debug("ISO9660 VRS (%u) found\n",
 746                                           vsd->structType);
 747                                 break;
 748                         }
 749                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
 750                                     VSD_STD_ID_LEN))
 751                         ; /* nothing */
 752                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
 753                                     VSD_STD_ID_LEN)) {
 754                         brelse(bh);
 755                         break;
 756                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
 757                                     VSD_STD_ID_LEN))
 758                         nsr02 = sector;
 759                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
 760                                     VSD_STD_ID_LEN))
 761                         nsr03 = sector;
 762                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BOOT2,
 763                                     VSD_STD_ID_LEN))
 764                         ; /* nothing */
 765                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CDW02,
 766                                     VSD_STD_ID_LEN))
 767                         ; /* nothing */
 768                 else {
 769                         /* invalid id : end of volume recognition area */
 770                         brelse(bh);
 771                         break;
 772                 }
 773                 brelse(bh);
 774         }
 775
 776         if (nsr03)
 777                 return nsr03;
 778         else if (nsr02)
 779                 return nsr02;
 780         else if (!bh && sector - (sbi->s_session << sb->s_blocksize_bits) ==
 781                         VSD_FIRST_SECTOR_OFFSET)
 782                 return -1;
 783         else
 784                 return 0;
 785 }
 786
 787 static int udf_find_fileset(struct super_block *sb,
 788                             struct kernel_lb_addr *fileset,
 789                             struct kernel_lb_addr *root)
 790 {
 791         struct buffer_head *bh = NULL;
 792         long lastblock;
 793         uint16_t ident;
 794         struct udf_sb_info *sbi;
 795
 796         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
 797             fileset->partitionReferenceNum != 0xFFFF) {
 798                 bh = udf_read_ptagged(sb, fileset, 0, &ident);
 799
 800                 if (!bh) {
 801                         return 1;
 802                 } else if (ident != TAG_IDENT_FSD) {
 803                         brelse(bh);
 804                         return 1;
 805                 }
 806
 807         }
 808
 809         sbi = UDF_SB(sb);
 810         if (!bh) {
 811                 /* Search backwards through the partitions */
 812                 struct kernel_lb_addr newfileset;
 813
 814 /* --> cvg: FIXME - is it reasonable? */
 815                 return 1;
 816
 817                 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
 818                      (newfileset.partitionReferenceNum != 0xFFFF &&
 819                       fileset->logicalBlockNum == 0xFFFFFFFF &&
 820                       fileset->partitionReferenceNum == 0xFFFF);
 821                      newfileset.partitionReferenceNum--) {
 822                         lastblock = sbi->s_partmaps
 823                                         [newfileset.partitionReferenceNum]
 824                                                 .s_partition_len;
 825                         newfileset.logicalBlockNum = 0;
 826
 827                         do {
 828                                 bh = udf_read_ptagged(sb, &newfileset, 0,
 829                                                       &ident);
 830                                 if (!bh) {
 831                                         newfileset.logicalBlockNum++;
 832                                         continue;
 833                                 }
 834
 835                                 switch (ident) {
 836                                 case TAG_IDENT_SBD:
 837                                 {
 838                                         struct spaceBitmapDesc *sp;
 839                                         sp = (struct spaceBitmapDesc *)
 840                                                                 bh->b_data;
 841                                         newfileset.logicalBlockNum += 1 +
 842                                                 ((le32_to_cpu(sp->numOfBytes) +
 843                                                   sizeof(struct spaceBitmapDesc)
 844                                                   - 1) >> sb->s_blocksize_bits);
 845                                         brelse(bh);
 846                                         break;
 847                                 }
 848                                 case TAG_IDENT_FSD:
 849                                         *fileset = newfileset;
 850                                         break;
 851                                 default:
 852                                         newfileset.logicalBlockNum++;
 853                                         brelse(bh);
 854                                         bh = NULL;
 855                                         break;
 856                                 }
 857                         } while (newfileset.logicalBlockNum < lastblock &&
 858                                  fileset->logicalBlockNum == 0xFFFFFFFF &&
 859                                  fileset->partitionReferenceNum == 0xFFFF);
 860                 }
 861         }
 862
 863         if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
 864              fileset->partitionReferenceNum != 0xFFFF) && bh) {
 865                 udf_debug("Fileset at block=%d, partition=%d\n",
 866                           fileset->logicalBlockNum,
 867                           fileset->partitionReferenceNum);
 868
 869                 sbi->s_partition = fileset->partitionReferenceNum;
 870                 udf_load_fileset(sb, bh, root);
 871                 brelse(bh);
 872                 return 0;
 873         }
 874         return 1;
 875 }
 876
 877 /*
 878  * Load primary Volume Descriptor Sequence
 879  *
 880  * Return <0 on error, 0 on success. -EAGAIN is special meaning next sequence
 881  * should be tried.
 882  */
 883 static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
 884 {
 885         struct primaryVolDesc *pvoldesc;
 886         uint8_t *outstr;
 887         struct buffer_head *bh;
 888         uint16_t ident;
 889         int ret = -ENOMEM;
 890
 891         outstr = kmalloc(128, GFP_NOFS);
 892         if (!outstr)
 893                 return -ENOMEM;
 894
 895         bh = udf_read_tagged(sb, block, block, &ident);
 896         if (!bh) {
 897                 ret = -EAGAIN;
 898                 goto out2;
 899         }
 900
 901         if (ident != TAG_IDENT_PVD) {
 902                 ret = -EIO;
 903                 goto out_bh;
 904         }
 905
 906         pvoldesc = (struct primaryVolDesc *)bh->b_data;
 907
 908         if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
 909                               pvoldesc->recordingDateAndTime)) {
 910 #ifdef UDFFS_DEBUG
 911                 struct timestamp *ts = &pvoldesc->recordingDateAndTime;
 912                 udf_debug("recording time %04u/%02u/%02u %02u:%02u (%x)\n",
 913                           le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
 914                           ts->minute, le16_to_cpu(ts->typeAndTimezone));
 915 #endif
 916         }
 917
 918         ret = udf_dstrCS0toUTF8(outstr, 31, pvoldesc->volIdent, 32);
 919         if (ret < 0) {
 920                 strcpy(UDF_SB(sb)->s_volume_ident, "InvalidName");
 921                 pr_warn("incorrect volume identification, setting to "
 922                         "'InvalidName'\n");
 923         } else {
 924                 strncpy(UDF_SB(sb)->s_volume_ident, outstr, ret);
 925         }
 926         udf_debug("volIdent[] = '%s'\n", UDF_SB(sb)->s_volume_ident);
 927
 928         ret = udf_dstrCS0toUTF8(outstr, 127, pvoldesc->volSetIdent, 128);
 929         if (ret < 0) {
 930                 ret = 0;
 931                 goto out_bh;
 932         }
 933         outstr[ret] = 0;
 934         udf_debug("volSetIdent[] = '%s'\n", outstr);
 935
 936         ret = 0;
 937 out_bh:
 938         brelse(bh);
 939 out2:
 940         kfree(outstr);
 941         return ret;
 942 }
 943
 944 struct inode *udf_find_metadata_inode_efe(struct super_block *sb,
 945                                         u32 meta_file_loc, u32 partition_ref)
 946 {
 947         struct kernel_lb_addr addr;
 948         struct inode *metadata_fe;
 949
 950         addr.logicalBlockNum = meta_file_loc;
 951         addr.partitionReferenceNum = partition_ref;
 952
 953         metadata_fe = udf_iget_special(sb, &addr);
 954
 955         if (IS_ERR(metadata_fe)) {
 956                 udf_warn(sb, "metadata inode efe not found\n");
 957                 return metadata_fe;
 958         }
 959         if (UDF_I(metadata_fe)->i_alloc_type != ICBTAG_FLAG_AD_SHORT) {
 960                 udf_warn(sb, "metadata inode efe does not have short allocation descriptors!\n");
 961                 iput(metadata_fe);
 962                 return ERR_PTR(-EIO);
 963         }
 964
 965         return metadata_fe;
 966 }
 967
 968 static int udf_load_metadata_files(struct super_block *sb, int partition,
 969                                    int type1_index)
 970 {
 971         struct udf_sb_info *sbi = UDF_SB(sb);
 972         struct udf_part_map *map;
 973         struct udf_meta_data *mdata;
 974         struct kernel_lb_addr addr;
 975         struct inode *fe;
 976
 977         map = &sbi->s_partmaps[partition];
 978         mdata = &map->s_type_specific.s_metadata;
 979         mdata->s_phys_partition_ref = type1_index;
 980
 981         /* metadata address */
 982         udf_debug("Metadata file location: block = %d part = %d\n",
 983                   mdata->s_meta_file_loc, mdata->s_phys_partition_ref);
 984
 985         fe = udf_find_metadata_inode_efe(sb, mdata->s_meta_file_loc,
 986                                          mdata->s_phys_partition_ref);
 987         if (IS_ERR(fe)) {
 988                 /* mirror file entry */
 989                 udf_debug("Mirror metadata file location: block = %d part = %d\n",
 990                           mdata->s_mirror_file_loc, mdata->s_phys_partition_ref);
 991
 992                 fe = udf_find_metadata_inode_efe(sb, mdata->s_mirror_file_loc,
 993                                                  mdata->s_phys_partition_ref);
 994
 995                 if (IS_ERR(fe)) {
 996                         udf_err(sb, "Both metadata and mirror metadata inode efe can not found\n");
 997                         return PTR_ERR(fe);
 998                 }
 999                 mdata->s_mirror_fe = fe;
1000         } else
1001                 mdata->s_metadata_fe = fe;
1002
1003
1004         /*
1005          * bitmap file entry
1006          * Note:
1007          * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
1008         */
1009         if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
1010                 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
1011                 addr.partitionReferenceNum = mdata->s_phys_partition_ref;
1012
1013                 udf_debug("Bitmap file location: block = %d part = %d\n",
1014                           addr.logicalBlockNum, addr.partitionReferenceNum);
1015
1016                 fe = udf_iget_special(sb, &addr);
1017                 if (IS_ERR(fe)) {
1018                         if (sb_rdonly(sb))
1019                                 udf_warn(sb, "bitmap inode efe not found but it's ok since the disc is mounted read-only\n");
1020                         else {
1021                                 udf_err(sb, "bitmap inode efe not found and attempted read-write mount\n");
1022                                 return PTR_ERR(fe);
1023                         }
1024                 } else
1025                         mdata->s_bitmap_fe = fe;
1026         }
1027
1028         udf_debug("udf_load_metadata_files Ok\n");
1029         return 0;
1030 }
1031
1032 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
1033                              struct kernel_lb_addr *root)
1034 {
1035         struct fileSetDesc *fset;
1036
1037         fset = (struct fileSetDesc *)bh->b_data;
1038
1039         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
1040
1041         UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
1042
1043         udf_debug("Rootdir at block=%d, partition=%d\n",
1044                   root->logicalBlockNum, root->partitionReferenceNum);
1045 }
1046
1047 int udf_compute_nr_groups(struct super_block *sb, u32 partition)
1048 {
1049         struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
1050         return DIV_ROUND_UP(map->s_partition_len +
1051                             (sizeof(struct spaceBitmapDesc) << 3),
1052                             sb->s_blocksize * 8);
1053 }
1054
1055 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
1056 {
1057         struct udf_bitmap *bitmap;
1058         int nr_groups;
1059         int size;
1060
1061         nr_groups = udf_compute_nr_groups(sb, index);
1062         size = sizeof(struct udf_bitmap) +
1063                 (sizeof(struct buffer_head *) * nr_groups);
1064
1065         if (size <= PAGE_SIZE)
1066                 bitmap = kzalloc(size, GFP_KERNEL);
1067         else
1068                 bitmap = vzalloc(size); /* TODO: get rid of vzalloc */
1069
1070         if (!bitmap)
1071                 return NULL;
1072
1073         bitmap->s_nr_groups = nr_groups;
1074         return bitmap;
1075 }
1076
1077 static int udf_fill_partdesc_info(struct super_block *sb,
1078                 struct partitionDesc *p, int p_index)
1079 {
1080         struct udf_part_map *map;
1081         struct udf_sb_info *sbi = UDF_SB(sb);
1082         struct partitionHeaderDesc *phd;
1083
1084         map = &sbi->s_partmaps[p_index];
1085
1086         map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
1087         map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
1088
1089         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
1090                 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
1091         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
1092                 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
1093         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
1094                 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
1095         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
1096                 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
1097
1098         udf_debug("Partition (%d type %x) starts at physical %d, block length %d\n",
1099                   p_index, map->s_partition_type,
1100                   map->s_partition_root, map->s_partition_len);
1101
1102         if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1103             strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
1104                 return 0;
1105
1106         phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1107         if (phd->unallocSpaceTable.extLength) {
1108                 struct kernel_lb_addr loc = {
1109                         .logicalBlockNum = le32_to_cpu(
1110                                 phd->unallocSpaceTable.extPosition),
1111                         .partitionReferenceNum = p_index,
1112                 };
1113                 struct inode *inode;
1114
1115                 inode = udf_iget_special(sb, &loc);
1116                 if (IS_ERR(inode)) {
1117                         udf_debug("cannot load unallocSpaceTable (part %d)\n",
1118                                   p_index);
1119                         return PTR_ERR(inode);
1120                 }
1121                 map->s_uspace.s_table = inode;
1122                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1123                 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
1124                           p_index, map->s_uspace.s_table->i_ino);
1125         }
1126
1127         if (phd->unallocSpaceBitmap.extLength) {
1128                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1129                 if (!bitmap)
1130                         return -ENOMEM;
1131                 map->s_uspace.s_bitmap = bitmap;
1132                 bitmap->s_extPosition = le32_to_cpu(
1133                                 phd->unallocSpaceBitmap.extPosition);
1134                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1135                 udf_debug("unallocSpaceBitmap (part %d) @ %d\n",
1136                           p_index, bitmap->s_extPosition);
1137         }
1138
1139         if (phd->partitionIntegrityTable.extLength)
1140                 udf_debug("partitionIntegrityTable (part %d)\n", p_index);
1141
1142         if (phd->freedSpaceTable.extLength) {
1143                 struct kernel_lb_addr loc = {
1144                         .logicalBlockNum = le32_to_cpu(
1145                                 phd->freedSpaceTable.extPosition),
1146                         .partitionReferenceNum = p_index,
1147                 };
1148                 struct inode *inode;
1149
1150                 inode = udf_iget_special(sb, &loc);
1151                 if (IS_ERR(inode)) {
1152                         udf_debug("cannot load freedSpaceTable (part %d)\n",
1153                                   p_index);
1154                         return PTR_ERR(inode);
1155                 }
1156                 map->s_fspace.s_table = inode;
1157                 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
1158                 udf_debug("freedSpaceTable (part %d) @ %ld\n",
1159                           p_index, map->s_fspace.s_table->i_ino);
1160         }
1161
1162         if (phd->freedSpaceBitmap.extLength) {
1163                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1164                 if (!bitmap)
1165                         return -ENOMEM;
1166                 map->s_fspace.s_bitmap = bitmap;
1167                 bitmap->s_extPosition = le32_to_cpu(
1168                                 phd->freedSpaceBitmap.extPosition);
1169                 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1170                 udf_debug("freedSpaceBitmap (part %d) @ %d\n",
1171                           p_index, bitmap->s_extPosition);
1172         }
1173         return 0;
1174 }
1175
1176 static void udf_find_vat_block(struct super_block *sb, int p_index,
1177                                int type1_index, sector_t start_block)
1178 {
1179         struct udf_sb_info *sbi = UDF_SB(sb);
1180         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1181         sector_t vat_block;
1182         struct kernel_lb_addr ino;
1183         struct inode *inode;
1184
1185         /*
1186          * VAT file entry is in the last recorded block. Some broken disks have
1187          * it a few blocks before so try a bit harder...
1188          */
1189         ino.partitionReferenceNum = type1_index;
1190         for (vat_block = start_block;
1191              vat_block >= map->s_partition_root &&
1192              vat_block >= start_block - 3; vat_block--) {
1193                 ino.logicalBlockNum = vat_block - map->s_partition_root;
1194                 inode = udf_iget_special(sb, &ino);
1195                 if (!IS_ERR(inode)) {
1196                         sbi->s_vat_inode = inode;
1197                         break;
1198                 }
1199         }
1200 }
1201
1202 static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1203 {
1204         struct udf_sb_info *sbi = UDF_SB(sb);
1205         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1206         struct buffer_head *bh = NULL;
1207         struct udf_inode_info *vati;
1208         uint32_t pos;
1209         struct virtualAllocationTable20 *vat20;
1210         sector_t blocks = i_size_read(sb->s_bdev->bd_inode) >>
1211                           sb->s_blocksize_bits;
1212
1213         udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block);
1214         if (!sbi->s_vat_inode &&
1215             sbi->s_last_block != blocks - 1) {
1216                 pr_notice("Failed to read VAT inode from the last recorded block (%lu), retrying with the last block of the device (%lu).\n",
1217                           (unsigned long)sbi->s_last_block,
1218                           (unsigned long)blocks - 1);
1219                 udf_find_vat_block(sb, p_index, type1_index, blocks - 1);
1220         }
1221         if (!sbi->s_vat_inode)
1222                 return -EIO;
1223
1224         if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1225                 map->s_type_specific.s_virtual.s_start_offset = 0;
1226                 map->s_type_specific.s_virtual.s_num_entries =
1227                         (sbi->s_vat_inode->i_size - 36) >> 2;
1228         } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1229                 vati = UDF_I(sbi->s_vat_inode);
1230                 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1231                         pos = udf_block_map(sbi->s_vat_inode, 0);
1232                         bh = sb_bread(sb, pos);
1233                         if (!bh)
1234                                 return -EIO;
1235                         vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1236                 } else {
1237                         vat20 = (struct virtualAllocationTable20 *)
1238                                                         vati->i_ext.i_data;
1239                 }
1240
1241                 map->s_type_specific.s_virtual.s_start_offset =
1242                         le16_to_cpu(vat20->lengthHeader);
1243                 map->s_type_specific.s_virtual.s_num_entries =
1244                         (sbi->s_vat_inode->i_size -
1245                                 map->s_type_specific.s_virtual.
1246                                         s_start_offset) >> 2;
1247                 brelse(bh);
1248         }
1249         return 0;
1250 }
1251
1252 /*
1253  * Load partition descriptor block
1254  *
1255  * Returns <0 on error, 0 on success, -EAGAIN is special - try next descriptor
1256  * sequence.
1257  */
1258 static int udf_load_partdesc(struct super_block *sb, sector_t block)
1259 {
1260         struct buffer_head *bh;
1261         struct partitionDesc *p;
1262         struct udf_part_map *map;
1263         struct udf_sb_info *sbi = UDF_SB(sb);
1264         int i, type1_idx;
1265         uint16_t partitionNumber;
1266         uint16_t ident;
1267         int ret;
1268
1269         bh = udf_read_tagged(sb, block, block, &ident);
1270         if (!bh)
1271                 return -EAGAIN;
1272         if (ident != TAG_IDENT_PD) {
1273                 ret = 0;
1274                 goto out_bh;
1275         }
1276
1277         p = (struct partitionDesc *)bh->b_data;
1278         partitionNumber = le16_to_cpu(p->partitionNumber);
1279
1280         /* First scan for TYPE1 and SPARABLE partitions */
1281         for (i = 0; i < sbi->s_partitions; i++) {
1282                 map = &sbi->s_partmaps[i];
1283                 udf_debug("Searching map: (%d == %d)\n",
1284                           map->s_partition_num, partitionNumber);
1285                 if (map->s_partition_num == partitionNumber &&
1286                     (map->s_partition_type == UDF_TYPE1_MAP15 ||
1287                      map->s_partition_type == UDF_SPARABLE_MAP15))
1288                         break;
1289         }
1290
1291         if (i >= sbi->s_partitions) {
1292                 udf_debug("Partition (%d) not found in partition map\n",
1293                           partitionNumber);
1294                 ret = 0;
1295                 goto out_bh;
1296         }
1297
1298         ret = udf_fill_partdesc_info(sb, p, i);
1299         if (ret < 0)
1300                 goto out_bh;
1301
1302         /*
1303          * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1304          * PHYSICAL partitions are already set up
1305          */
1306         type1_idx = i;
1307 #ifdef UDFFS_DEBUG
1308         map = NULL; /* supress 'maybe used uninitialized' warning */
1309 #endif
1310         for (i = 0; i < sbi->s_partitions; i++) {
1311                 map = &sbi->s_partmaps[i];
1312
1313                 if (map->s_partition_num == partitionNumber &&
1314                     (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1315                      map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1316                      map->s_partition_type == UDF_METADATA_MAP25))
1317                         break;
1318         }
1319
1320         if (i >= sbi->s_partitions) {
1321                 ret = 0;
1322                 goto out_bh;
1323         }
1324
1325         ret = udf_fill_partdesc_info(sb, p, i);
1326         if (ret < 0)
1327                 goto out_bh;
1328
1329         if (map->s_partition_type == UDF_METADATA_MAP25) {
1330                 ret = udf_load_metadata_files(sb, i, type1_idx);
1331                 if (ret < 0) {
1332                         udf_err(sb, "error loading MetaData partition map %d\n",
1333                                 i);
1334                         goto out_bh;
1335                 }
1336         } else {
1337                 /*
1338                  * If we have a partition with virtual map, we don't handle
1339                  * writing to it (we overwrite blocks instead of relocating
1340                  * them).
1341                  */
1342                 if (!sb_rdonly(sb)) {
1343                         ret = -EACCES;
1344                         goto out_bh;
1345                 }
1346                 ret = udf_load_vat(sb, i, type1_idx);
1347                 if (ret < 0)
1348                         goto out_bh;
1349         }
1350         ret = 0;
1351 out_bh:
1352         /* In case loading failed, we handle cleanup in udf_fill_super */
1353         brelse(bh);
1354         return ret;
1355 }
1356
1357 static int udf_load_sparable_map(struct super_block *sb,
1358                                  struct udf_part_map *map,
1359                                  struct sparablePartitionMap *spm)
1360 {
1361         uint32_t loc;
1362         uint16_t ident;
1363         struct sparingTable *st;
1364         struct udf_sparing_data *sdata = &map->s_type_specific.s_sparing;
1365         int i;
1366         struct buffer_head *bh;
1367
1368         map->s_partition_type = UDF_SPARABLE_MAP15;
1369         sdata->s_packet_len = le16_to_cpu(spm->packetLength);
1370         if (!is_power_of_2(sdata->s_packet_len)) {
1371                 udf_err(sb, "error loading logical volume descriptor: "
1372                         "Invalid packet length %u\n",
1373                         (unsigned)sdata->s_packet_len);
1374                 return -EIO;
1375         }
1376         if (spm->numSparingTables > 4) {
1377                 udf_err(sb, "error loading logical volume descriptor: "
1378                         "Too many sparing tables (%d)\n",
1379                         (int)spm->numSparingTables);
1380                 return -EIO;
1381         }
1382         if (le32_to_cpu(spm->sizeSparingTable) > sb->s_blocksize) {
1383                 udf_err(sb, "error loading logical volume descriptor: "
1384                         "Too big sparing table size (%u)\n",
1385                         le32_to_cpu(spm->sizeSparingTable));
1386                 return -EIO;
1387         }
1388
1389         for (i = 0; i < spm->numSparingTables; i++) {
1390                 loc = le32_to_cpu(spm->locSparingTable[i]);
1391                 bh = udf_read_tagged(sb, loc, loc, &ident);
1392                 if (!bh)
1393                         continue;
1394
1395                 st = (struct sparingTable *)bh->b_data;
1396                 if (ident != 0 ||
1397                     strncmp(st->sparingIdent.ident, UDF_ID_SPARING,
1398                             strlen(UDF_ID_SPARING)) ||
1399                     sizeof(*st) + le16_to_cpu(st->reallocationTableLen) >
1400                                                         sb->s_blocksize) {
1401                         brelse(bh);
1402                         continue;
1403                 }
1404
1405                 sdata->s_spar_map[i] = bh;
1406         }
1407         map->s_partition_func = udf_get_pblock_spar15;
1408         return 0;
1409 }
1410
1411 static int udf_load_logicalvol(struct super_block *sb, sector_t block,
1412                                struct kernel_lb_addr *fileset)
1413 {
1414         struct logicalVolDesc *lvd;
1415         int i, offset;
1416         uint8_t type;
1417         struct udf_sb_info *sbi = UDF_SB(sb);
1418         struct genericPartitionMap *gpm;
1419         uint16_t ident;
1420         struct buffer_head *bh;
1421         unsigned int table_len;
1422         int ret;
1423
1424         bh = udf_read_tagged(sb, block, block, &ident);
1425         if (!bh)
1426                 return -EAGAIN;
1427         BUG_ON(ident != TAG_IDENT_LVD);
1428         lvd = (struct logicalVolDesc *)bh->b_data;
1429         table_len = le32_to_cpu(lvd->mapTableLength);
1430         if (table_len > sb->s_blocksize - sizeof(*lvd)) {
1431                 udf_err(sb, "error loading logical volume descriptor: "
1432                         "Partition table too long (%u > %lu)\n", table_len,
1433                         sb->s_blocksize - sizeof(*lvd));
1434                 ret = -EIO;
1435                 goto out_bh;
1436         }
1437
1438         ret = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1439         if (ret)
1440                 goto out_bh;
1441
1442         for (i = 0, offset = 0;
1443              i < sbi->s_partitions && offset < table_len;
1444              i++, offset += gpm->partitionMapLength) {
1445                 struct udf_part_map *map = &sbi->s_partmaps[i];
1446                 gpm = (struct genericPartitionMap *)
1447                                 &(lvd->partitionMaps[offset]);
1448                 type = gpm->partitionMapType;
1449                 if (type == 1) {
1450                         struct genericPartitionMap1 *gpm1 =
1451                                 (struct genericPartitionMap1 *)gpm;
1452                         map->s_partition_type = UDF_TYPE1_MAP15;
1453                         map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1454                         map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1455                         map->s_partition_func = NULL;
1456                 } else if (type == 2) {
1457                         struct udfPartitionMap2 *upm2 =
1458                                                 (struct udfPartitionMap2 *)gpm;
1459                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1460                                                 strlen(UDF_ID_VIRTUAL))) {
1461                                 u16 suf =
1462                                         le16_to_cpu(((__le16 *)upm2->partIdent.
1463                                                         identSuffix)[0]);
1464                                 if (suf < 0x0200) {
1465                                         map->s_partition_type =
1466                                                         UDF_VIRTUAL_MAP15;
1467                                         map->s_partition_func =
1468                                                         udf_get_pblock_virt15;
1469                                 } else {
1470                                         map->s_partition_type =
1471                                                         UDF_VIRTUAL_MAP20;
1472                                         map->s_partition_func =
1473                                                         udf_get_pblock_virt20;
1474                                 }
1475                         } else if (!strncmp(upm2->partIdent.ident,
1476                                                 UDF_ID_SPARABLE,
1477                                                 strlen(UDF_ID_SPARABLE))) {
1478                                 ret = udf_load_sparable_map(sb, map,
1479                                         (struct sparablePartitionMap *)gpm);
1480                                 if (ret < 0)
1481                                         goto out_bh;
1482                         } else if (!strncmp(upm2->partIdent.ident,
1483                                                 UDF_ID_METADATA,
1484                                                 strlen(UDF_ID_METADATA))) {
1485                                 struct udf_meta_data *mdata =
1486                                         &map->s_type_specific.s_metadata;
1487                                 struct metadataPartitionMap *mdm =
1488                                                 (struct metadataPartitionMap *)
1489                                                 &(lvd->partitionMaps[offset]);
1490                                 udf_debug("Parsing Logical vol part %d type %d  id=%s\n",
1491                                           i, type, UDF_ID_METADATA);
1492
1493                                 map->s_partition_type = UDF_METADATA_MAP25;
1494                                 map->s_partition_func = udf_get_pblock_meta25;
1495
1496                                 mdata->s_meta_file_loc   =
1497                                         le32_to_cpu(mdm->metadataFileLoc);
1498                                 mdata->s_mirror_file_loc =
1499                                         le32_to_cpu(mdm->metadataMirrorFileLoc);
1500                                 mdata->s_bitmap_file_loc =
1501                                         le32_to_cpu(mdm->metadataBitmapFileLoc);
1502                                 mdata->s_alloc_unit_size =
1503                                         le32_to_cpu(mdm->allocUnitSize);
1504                                 mdata->s_align_unit_size =
1505                                         le16_to_cpu(mdm->alignUnitSize);
1506                                 if (mdm->flags & 0x01)
1507                                         mdata->s_flags |= MF_DUPLICATE_MD;
1508
1509                                 udf_debug("Metadata Ident suffix=0x%x\n",
1510                                           le16_to_cpu(*(__le16 *)
1511                                                       mdm->partIdent.identSuffix));
1512                                 udf_debug("Metadata part num=%d\n",
1513                                           le16_to_cpu(mdm->partitionNum));
1514                                 udf_debug("Metadata part alloc unit size=%d\n",
1515                                           le32_to_cpu(mdm->allocUnitSize));
1516                                 udf_debug("Metadata file loc=%d\n",
1517                                           le32_to_cpu(mdm->metadataFileLoc));
1518                                 udf_debug("Mirror file loc=%d\n",
1519                                           le32_to_cpu(mdm->metadataMirrorFileLoc));
1520                                 udf_debug("Bitmap file loc=%d\n",
1521                                           le32_to_cpu(mdm->metadataBitmapFileLoc));
1522                                 udf_debug("Flags: %d %d\n",
1523                                           mdata->s_flags, mdm->flags);
1524                         } else {
1525                                 udf_debug("Unknown ident: %s\n",
1526                                           upm2->partIdent.ident);
1527                                 continue;
1528                         }
1529                         map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1530                         map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1531                 }
1532                 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1533                           i, map->s_partition_num, type, map->s_volumeseqnum);
1534         }
1535
1536         if (fileset) {
1537                 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
1538
1539                 *fileset = lelb_to_cpu(la->extLocation);
1540                 udf_debug("FileSet found in LogicalVolDesc at block=%d, partition=%d\n",
1541                           fileset->logicalBlockNum,
1542                           fileset->partitionReferenceNum);
1543         }
1544         if (lvd->integritySeqExt.extLength)
1545                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1546         ret = 0;
1547 out_bh:
1548         brelse(bh);
1549         return ret;
1550 }
1551
1552 /*
1553  * Find the prevailing Logical Volume Integrity Descriptor.
1554  */
1555 static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
1556 {
1557         struct buffer_head *bh, *final_bh;
1558         uint16_t ident;
1559         struct udf_sb_info *sbi = UDF_SB(sb);
1560         struct logicalVolIntegrityDesc *lvid;
1561         int indirections = 0;
1562         u32 parts, impuselen;
1563
1564         while (++indirections <= UDF_MAX_LVID_NESTING) {
1565                 final_bh = NULL;
1566                 while (loc.extLength > 0 &&
1567                         (bh = udf_read_tagged(sb, loc.extLocation,
1568                                         loc.extLocation, &ident))) {
1569                         if (ident != TAG_IDENT_LVID) {
1570                                 brelse(bh);
1571                                 break;
1572                         }
1573
1574                         brelse(final_bh);
1575                         final_bh = bh;
1576
1577                         loc.extLength -= sb->s_blocksize;
1578                         loc.extLocation++;
1579                 }
1580
1581                 if (!final_bh)
1582                         return;
1583
1584                 brelse(sbi->s_lvid_bh);
1585                 sbi->s_lvid_bh = final_bh;
1586
1587                 lvid = (struct logicalVolIntegrityDesc *)final_bh->b_data;
1588                 if (lvid->nextIntegrityExt.extLength == 0)
1589                         goto check;
1590
1591                 loc = leea_to_cpu(lvid->nextIntegrityExt);
1592         }
1593
1594         udf_warn(sb, "Too many LVID indirections (max %u), ignoring.\n",
1595                 UDF_MAX_LVID_NESTING);
1596 out_err:
1597         brelse(sbi->s_lvid_bh);
1598         sbi->s_lvid_bh = NULL;
1599         return;
1600 check:
1601         parts = le32_to_cpu(lvid->numOfPartitions);
1602         impuselen = le32_to_cpu(lvid->lengthOfImpUse);
1603         if (parts >= sb->s_blocksize || impuselen >= sb->s_blocksize ||
1604             sizeof(struct logicalVolIntegrityDesc) + impuselen +
1605             2 * parts * sizeof(u32) > sb->s_blocksize) {
1606                 udf_warn(sb, "Corrupted LVID (parts=%u, impuselen=%u), "
1607                          "ignoring.\n", parts, impuselen);
1608                 goto out_err;
1609         }
1610 }
1611
1612
1613 /*
1614  * Process a main/reserve volume descriptor sequence.
1615  *   @block             First block of first extent of the sequence.
1616  *   @lastblock         Lastblock of first extent of the sequence.
1617  *   @fileset           There we store extent containing root fileset
1618  *
1619  * Returns <0 on error, 0 on success. -EAGAIN is special - try next descriptor
1620  * sequence
1621  */
1622 static noinline int udf_process_sequence(
1623                 struct super_block *sb,
1624                 sector_t block, sector_t lastblock,
1625                 struct kernel_lb_addr *fileset)
1626 {
1627         struct buffer_head *bh = NULL;
1628         struct udf_vds_record vds[VDS_POS_LENGTH];
1629         struct udf_vds_record *curr;
1630         struct generic_desc *gd;
1631         struct volDescPtr *vdp;
1632         bool done = false;
1633         uint32_t vdsn;
1634         uint16_t ident;
1635         long next_s = 0, next_e = 0;
1636         int ret;
1637         unsigned int indirections = 0;
1638
1639         memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1640
1641         /*
1642          * Read the main descriptor sequence and find which descriptors
1643          * are in it.
1644          */
1645         for (; (!done && block <= lastblock); block++) {
1646
1647                 bh = udf_read_tagged(sb, block, block, &ident);
1648                 if (!bh) {
1649                         udf_err(sb,
1650                                 "Block %llu of volume descriptor sequence is corrupted or we could not read it\n",
1651                                 (unsigned long long)block);
1652                         return -EAGAIN;
1653                 }
1654
1655                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1656                 gd = (struct generic_desc *)bh->b_data;
1657                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1658                 switch (ident) {
1659                 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1660                         curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1661                         if (vdsn >= curr->volDescSeqNum) {
1662                                 curr->volDescSeqNum = vdsn;
1663                                 curr->block = block;
1664                         }
1665                         break;
1666                 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1667                         curr = &vds[VDS_POS_VOL_DESC_PTR];
1668                         if (vdsn >= curr->volDescSeqNum) {
1669                                 curr->volDescSeqNum = vdsn;
1670                                 curr->block = block;
1671
1672                                 vdp = (struct volDescPtr *)bh->b_data;
1673                                 next_s = le32_to_cpu(
1674                                         vdp->nextVolDescSeqExt.extLocation);
1675                                 next_e = le32_to_cpu(
1676                                         vdp->nextVolDescSeqExt.extLength);
1677                                 next_e = next_e >> sb->s_blocksize_bits;
1678                                 next_e += next_s;
1679                         }
1680                         break;
1681                 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1682                         curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1683                         if (vdsn >= curr->volDescSeqNum) {
1684                                 curr->volDescSeqNum = vdsn;
1685                                 curr->block = block;
1686                         }
1687                         break;
1688                 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1689                         curr = &vds[VDS_POS_PARTITION_DESC];
1690                         if (!curr->block)
1691                                 curr->block = block;
1692                         break;
1693                 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1694                         curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1695                         if (vdsn >= curr->volDescSeqNum) {
1696                                 curr->volDescSeqNum = vdsn;
1697                                 curr->block = block;
1698                         }
1699                         break;
1700                 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1701                         curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1702                         if (vdsn >= curr->volDescSeqNum) {
1703                                 curr->volDescSeqNum = vdsn;
1704                                 curr->block = block;
1705                         }
1706                         break;
1707                 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1708                         if (++indirections > UDF_MAX_TD_NESTING) {
1709                                 udf_err(sb, "too many TDs (max %u supported)\n", UDF_MAX_TD_NESTING);
1710                                 brelse(bh);
1711                                 return -EIO;
1712                         }
1713
1714                         vds[VDS_POS_TERMINATING_DESC].block = block;
1715                         if (next_e) {
1716                                 block = next_s;
1717                                 lastblock = next_e;
1718                                 next_s = next_e = 0;
1719                         } else
1720                                 done = true;
1721                         break;
1722                 }
1723                 brelse(bh);
1724         }
1725         /*
1726          * Now read interesting descriptors again and process them
1727          * in a suitable order
1728          */
1729         if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1730                 udf_err(sb, "Primary Volume Descriptor not found!\n");
1731                 return -EAGAIN;
1732         }
1733         ret = udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block);
1734         if (ret < 0)
1735                 return ret;
1736
1737         if (vds[VDS_POS_LOGICAL_VOL_DESC].block) {
1738                 ret = udf_load_logicalvol(sb,
1739                                           vds[VDS_POS_LOGICAL_VOL_DESC].block,
1740                                           fileset);
1741                 if (ret < 0)
1742                         return ret;
1743         }
1744
1745         if (vds[VDS_POS_PARTITION_DESC].block) {
1746                 /*
1747                  * We rescan the whole descriptor sequence to find
1748                  * partition descriptor blocks and process them.
1749                  */
1750                 for (block = vds[VDS_POS_PARTITION_DESC].block;
1751                      block < vds[VDS_POS_TERMINATING_DESC].block;
1752                      block++) {
1753                         ret = udf_load_partdesc(sb, block);
1754                         if (ret < 0)
1755                                 return ret;
1756                 }
1757         }
1758
1759         return 0;
1760 }
1761
1762 /*
1763  * Load Volume Descriptor Sequence described by anchor in bh
1764  *
1765  * Returns <0 on error, 0 on success
1766  */
1767 static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh,
1768                              struct kernel_lb_addr *fileset)
1769 {
1770         struct anchorVolDescPtr *anchor;
1771         sector_t main_s, main_e, reserve_s, reserve_e;
1772         int ret;
1773
1774         anchor = (struct anchorVolDescPtr *)bh->b_data;
1775
1776         /* Locate the main sequence */
1777         main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1778         main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1779         main_e = main_e >> sb->s_blocksize_bits;
1780         main_e += main_s;
1781
1782         /* Locate the reserve sequence */
1783         reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1784         reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1785         reserve_e = reserve_e >> sb->s_blocksize_bits;
1786         reserve_e += reserve_s;
1787
1788         /* Process the main & reserve sequences */
1789         /* responsible for finding the PartitionDesc(s) */
1790         ret = udf_process_sequence(sb, main_s, main_e, fileset);
1791         if (ret != -EAGAIN)
1792                 return ret;
1793         udf_sb_free_partitions(sb);
1794         ret = udf_process_sequence(sb, reserve_s, reserve_e, fileset);
1795         if (ret < 0) {
1796                 udf_sb_free_partitions(sb);
1797                 /* No sequence was OK, return -EIO */
1798                 if (ret == -EAGAIN)
1799                         ret = -EIO;
1800         }
1801         return ret;
1802 }
1803
1804 /*
1805  * Check whether there is an anchor block in the given block and
1806  * load Volume Descriptor Sequence if so.
1807  *
1808  * Returns <0 on error, 0 on success, -EAGAIN is special - try next anchor
1809  * block
1810  */
1811 static int udf_check_anchor_block(struct super_block *sb, sector_t block,
1812                                   struct kernel_lb_addr *fileset)
1813 {
1814         struct buffer_head *bh;
1815         uint16_t ident;
1816         int ret;
1817
1818         if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
1819             udf_fixed_to_variable(block) >=
1820             i_size_read(sb->s_bdev->bd_inode) >> sb->s_blocksize_bits)
1821                 return -EAGAIN;
1822
1823         bh = udf_read_tagged(sb, block, block, &ident);
1824         if (!bh)
1825                 return -EAGAIN;
1826         if (ident != TAG_IDENT_AVDP) {
1827                 brelse(bh);
1828                 return -EAGAIN;
1829         }
1830         ret = udf_load_sequence(sb, bh, fileset);
1831         brelse(bh);
1832         return ret;
1833 }
1834
1835 /*
1836  * Search for an anchor volume descriptor pointer.
1837  *
1838  * Returns < 0 on error, 0 on success. -EAGAIN is special - try next set
1839  * of anchors.
1840  */
1841 static int udf_scan_anchors(struct super_block *sb, sector_t *lastblock,
1842                             struct kernel_lb_addr *fileset)
1843 {
1844         sector_t last[6];
1845         int i;
1846         struct udf_sb_info *sbi = UDF_SB(sb);
1847         int last_count = 0;
1848         int ret;
1849
1850         /* First try user provided anchor */
1851         if (sbi->s_anchor) {
1852                 ret = udf_check_anchor_block(sb, sbi->s_anchor, fileset);
1853                 if (ret != -EAGAIN)
1854                         return ret;
1855         }
1856         /*
1857          * according to spec, anchor is in either:
1858          *     block 256
1859          *     lastblock-256
1860          *     lastblock
1861          *  however, if the disc isn't closed, it could be 512.
1862          */
1863         ret = udf_check_anchor_block(sb, sbi->s_session + 256, fileset);
1864         if (ret != -EAGAIN)
1865                 return ret;
1866         /*
1867          * The trouble is which block is the last one. Drives often misreport
1868          * this so we try various possibilities.
1869          */
1870         last[last_count++] = *lastblock;
1871         if (*lastblock >= 1)
1872                 last[last_count++] = *lastblock - 1;
1873         last[last_count++] = *lastblock + 1;
1874         if (*lastblock >= 2)
1875                 last[last_count++] = *lastblock - 2;
1876         if (*lastblock >= 150)
1877                 last[last_count++] = *lastblock - 150;
1878         if (*lastblock >= 152)
1879                 last[last_count++] = *lastblock - 152;
1880
1881         for (i = 0; i < last_count; i++) {
1882                 if (last[i] >= i_size_read(sb->s_bdev->bd_inode) >>
1883                                 sb->s_blocksize_bits)
1884                         continue;
1885                 ret = udf_check_anchor_block(sb, last[i], fileset);
1886                 if (ret != -EAGAIN) {
1887                         if (!ret)
1888                                 *lastblock = last[i];
1889                         return ret;
1890                 }
1891                 if (last[i] < 256)
1892                         continue;
1893                 ret = udf_check_anchor_block(sb, last[i] - 256, fileset);
1894                 if (ret != -EAGAIN) {
1895                         if (!ret)
1896                                 *lastblock = last[i];
1897                         return ret;
1898                 }
1899         }
1900
1901         /* Finally try block 512 in case media is open */
1902         return udf_check_anchor_block(sb, sbi->s_session + 512, fileset);
1903 }
1904
1905 /*
1906  * Find an anchor volume descriptor and load Volume Descriptor Sequence from
1907  * area specified by it. The function expects sbi->s_lastblock to be the last
1908  * block on the media.
1909  *
1910  * Return <0 on error, 0 if anchor found. -EAGAIN is special meaning anchor
1911  * was not found.
1912  */
1913 static int udf_find_anchor(struct super_block *sb,
1914                            struct kernel_lb_addr *fileset)
1915 {
1916         struct udf_sb_info *sbi = UDF_SB(sb);
1917         sector_t lastblock = sbi->s_last_block;
1918         int ret;
1919
1920         ret = udf_scan_anchors(sb, &lastblock, fileset);
1921         if (ret != -EAGAIN)
1922                 goto out;
1923
1924         /* No anchor found? Try VARCONV conversion of block numbers */
1925         UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
1926         lastblock = udf_variable_to_fixed(sbi->s_last_block);
1927         /* Firstly, we try to not convert number of the last block */
1928         ret = udf_scan_anchors(sb, &lastblock, fileset);
1929         if (ret != -EAGAIN)
1930                 goto out;
1931
1932         lastblock = sbi->s_last_block;
1933         /* Secondly, we try with converted number of the last block */
1934         ret = udf_scan_anchors(sb, &lastblock, fileset);
1935         if (ret < 0) {
1936                 /* VARCONV didn't help. Clear it. */
1937                 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
1938         }
1939 out:
1940         if (ret == 0)
1941                 sbi->s_last_block = lastblock;
1942         return ret;
1943 }
1944
1945 /*
1946  * Check Volume Structure Descriptor, find Anchor block and load Volume
1947  * Descriptor Sequence.
1948  *
1949  * Returns < 0 on error, 0 on success. -EAGAIN is special meaning anchor
1950  * block was not found.
1951  */
1952 static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
1953                         int silent, struct kernel_lb_addr *fileset)
1954 {
1955         struct udf_sb_info *sbi = UDF_SB(sb);
1956         loff_t nsr_off;
1957         int ret;
1958
1959         if (!sb_set_blocksize(sb, uopt->blocksize)) {
1960                 if (!silent)
1961                         udf_warn(sb, "Bad block size\n");
1962                 return -EINVAL;
1963         }
1964         sbi->s_last_block = uopt->lastblock;
1965         if (!uopt->novrs) {
1966                 /* Check that it is NSR02 compliant */
1967                 nsr_off = udf_check_vsd(sb);
1968                 if (!nsr_off) {
1969                         if (!silent)
1970                                 udf_warn(sb, "No VRS found\n");
1971                         return -EINVAL;
1972                 }
1973                 if (nsr_off == -1)
1974                         udf_debug("Failed to read sector at offset %d. "
1975                                   "Assuming open disc. Skipping validity "
1976                                   "check\n", VSD_FIRST_SECTOR_OFFSET);
1977                 if (!sbi->s_last_block)
1978                         sbi->s_last_block = udf_get_last_block(sb);
1979         } else {
1980                 udf_debug("Validity check skipped because of novrs option\n");
1981         }
1982
1983         /* Look for anchor block and load Volume Descriptor Sequence */
1984         sbi->s_anchor = uopt->anchor;
1985         ret = udf_find_anchor(sb, fileset);
1986         if (ret < 0) {
1987                 if (!silent && ret == -EAGAIN)
1988                         udf_warn(sb, "No anchor found\n");
1989                 return ret;
1990         }
1991         return 0;
1992 }
1993
1994 static void udf_open_lvid(struct super_block *sb)
1995 {
1996         struct udf_sb_info *sbi = UDF_SB(sb);
1997         struct buffer_head *bh = sbi->s_lvid_bh;
1998         struct logicalVolIntegrityDesc *lvid;
1999         struct logicalVolIntegrityDescImpUse *lvidiu;
2000         struct timespec ts;
2001
2002         if (!bh)
2003                 return;
2004         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
2005         lvidiu = udf_sb_lvidiu(sb);
2006         if (!lvidiu)
2007                 return;
2008
2009         mutex_lock(&sbi->s_alloc_mutex);
2010         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
2011         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
2012         ktime_get_real_ts(&ts);
2013         udf_time_to_disk_stamp(&lvid->recordingDateAndTime, ts);
2014         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN);
2015
2016         lvid->descTag.descCRC = cpu_to_le16(
2017                 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
2018                         le16_to_cpu(lvid->descTag.descCRCLength)));
2019
2020         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
2021         mark_buffer_dirty(bh);
2022         sbi->s_lvid_dirty = 0;
2023         mutex_unlock(&sbi->s_alloc_mutex);
2024         /* Make opening of filesystem visible on the media immediately */
2025         sync_dirty_buffer(bh);
2026 }
2027
2028 static void udf_close_lvid(struct super_block *sb)
2029 {
2030         struct udf_sb_info *sbi = UDF_SB(sb);
2031         struct buffer_head *bh = sbi->s_lvid_bh;
2032         struct logicalVolIntegrityDesc *lvid;
2033         struct logicalVolIntegrityDescImpUse *lvidiu;
2034         struct timespec ts;
2035
2036         if (!bh)
2037                 return;
2038         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
2039         lvidiu = udf_sb_lvidiu(sb);
2040         if (!lvidiu)
2041                 return;
2042
2043         mutex_lock(&sbi->s_alloc_mutex);
2044         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
2045         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
2046         ktime_get_real_ts(&ts);
2047         udf_time_to_disk_stamp(&lvid->recordingDateAndTime, ts);
2048         if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
2049                 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
2050         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
2051                 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
2052         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
2053                 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
2054         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
2055
2056         lvid->descTag.descCRC = cpu_to_le16(
2057                         crc_itu_t(0, (char *)lvid + sizeof(struct tag),
2058                                 le16_to_cpu(lvid->descTag.descCRCLength)));
2059
2060         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
2061         /*
2062          * We set buffer uptodate unconditionally here to avoid spurious
2063          * warnings from mark_buffer_dirty() when previous EIO has marked
2064          * the buffer as !uptodate
2065          */
2066         set_buffer_uptodate(bh);
2067         mark_buffer_dirty(bh);
2068         sbi->s_lvid_dirty = 0;
2069         mutex_unlock(&sbi->s_alloc_mutex);
2070         /* Make closing of filesystem visible on the media immediately */
2071         sync_dirty_buffer(bh);
2072 }
2073
2074 u64 lvid_get_unique_id(struct super_block *sb)
2075 {
2076         struct buffer_head *bh;
2077         struct udf_sb_info *sbi = UDF_SB(sb);
2078         struct logicalVolIntegrityDesc *lvid;
2079         struct logicalVolHeaderDesc *lvhd;
2080         u64 uniqueID;
2081         u64 ret;
2082
2083         bh = sbi->s_lvid_bh;
2084         if (!bh)
2085                 return 0;
2086
2087         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
2088         lvhd = (struct logicalVolHeaderDesc *)lvid->logicalVolContentsUse;
2089
2090         mutex_lock(&sbi->s_alloc_mutex);
2091         ret = uniqueID = le64_to_cpu(lvhd->uniqueID);
2092         if (!(++uniqueID & 0xFFFFFFFF))
2093                 uniqueID += 16;
2094         lvhd->uniqueID = cpu_to_le64(uniqueID);
2095         mutex_unlock(&sbi->s_alloc_mutex);
2096         mark_buffer_dirty(bh);
2097
2098         return ret;
2099 }
2100
2101 static int udf_fill_super(struct super_block *sb, void *options, int silent)
2102 {
2103         int ret = -EINVAL;
2104         struct inode *inode = NULL;
2105         struct udf_options uopt;
2106         struct kernel_lb_addr rootdir, fileset;
2107         struct udf_sb_info *sbi;
2108         bool lvid_open = false;
2109
2110         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
2111         /* By default we'll use overflow[ug]id when UDF inode [ug]id == -1 */
2112         uopt.uid = make_kuid(current_user_ns(), overflowuid);
2113         uopt.gid = make_kgid(current_user_ns(), overflowgid);
2114         uopt.umask = 0;
2115         uopt.fmode = UDF_INVALID_MODE;
2116         uopt.dmode = UDF_INVALID_MODE;
2117
2118         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
2119         if (!sbi)
2120                 return -ENOMEM;
2121
2122         sb->s_fs_info = sbi;
2123
2124         mutex_init(&sbi->s_alloc_mutex);
2125
2126         if (!udf_parse_options((char *)options, &uopt, false))
2127                 goto parse_options_failure;
2128
2129         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
2130             uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
2131                 udf_err(sb, "utf8 cannot be combined with iocharset\n");
2132                 goto parse_options_failure;
2133         }
2134 #ifdef CONFIG_UDF_NLS
2135         if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
2136                 uopt.nls_map = load_nls_default();
2137                 if (!uopt.nls_map)
2138                         uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
2139                 else
2140                         udf_debug("Using default NLS map\n");
2141         }
2142 #endif
2143         if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
2144                 uopt.flags |= (1 << UDF_FLAG_UTF8);
2145
2146         fileset.logicalBlockNum = 0xFFFFFFFF;
2147         fileset.partitionReferenceNum = 0xFFFF;
2148
2149         sbi->s_flags = uopt.flags;
2150         sbi->s_uid = uopt.uid;
2151         sbi->s_gid = uopt.gid;
2152         sbi->s_umask = uopt.umask;
2153         sbi->s_fmode = uopt.fmode;
2154         sbi->s_dmode = uopt.dmode;
2155         sbi->s_nls_map = uopt.nls_map;
2156         rwlock_init(&sbi->s_cred_lock);
2157
2158         if (uopt.session == 0xFFFFFFFF)
2159                 sbi->s_session = udf_get_last_session(sb);
2160         else
2161                 sbi->s_session = uopt.session;
2162
2163         udf_debug("Multi-session=%d\n", sbi->s_session);
2164
2165         /* Fill in the rest of the superblock */
2166         sb->s_op = &udf_sb_ops;
2167         sb->s_export_op = &udf_export_ops;
2168
2169         sb->s_magic = UDF_SUPER_MAGIC;
2170         sb->s_time_gran = 1000;
2171
2172         if (uopt.flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) {
2173                 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
2174         } else {
2175                 uopt.blocksize = bdev_logical_block_size(sb->s_bdev);
2176                 while (uopt.blocksize <= 4096) {
2177                         ret = udf_load_vrs(sb, &uopt, silent, &fileset);
2178                         if (ret < 0) {
2179                                 if (!silent && ret != -EACCES) {
2180                                         pr_notice("Scanning with blocksize %d failed\n",
2181                                                   uopt.blocksize);
2182                                 }
2183                                 brelse(sbi->s_lvid_bh);
2184                                 sbi->s_lvid_bh = NULL;
2185                                 /*
2186                                  * EACCES is special - we want to propagate to
2187                                  * upper layers that we cannot handle RW mount.
2188                                  */
2189                                 if (ret == -EACCES)
2190                                         break;
2191                         } else
2192                                 break;
2193
2194                         uopt.blocksize <<= 1;
2195                 }
2196         }
2197         if (ret < 0) {
2198                 if (ret == -EAGAIN) {
2199                         udf_warn(sb, "No partition found (1)\n");
2200                         ret = -EINVAL;
2201                 }
2202                 goto error_out;
2203         }
2204
2205         udf_debug("Lastblock=%d\n", sbi->s_last_block);
2206
2207         if (sbi->s_lvid_bh) {
2208                 struct logicalVolIntegrityDescImpUse *lvidiu =
2209                                                         udf_sb_lvidiu(sb);
2210                 uint16_t minUDFReadRev;
2211                 uint16_t minUDFWriteRev;
2212
2213                 if (!lvidiu) {
2214                         ret = -EINVAL;
2215                         goto error_out;
2216                 }
2217                 minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
2218                 minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
2219                 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
2220                         udf_err(sb, "minUDFReadRev=%x (max is %x)\n",
2221                                 minUDFReadRev,
2222                                 UDF_MAX_READ_VERSION);
2223                         ret = -EINVAL;
2224                         goto error_out;
2225                 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION &&
2226                            !sb_rdonly(sb)) {
2227                         ret = -EACCES;
2228                         goto error_out;
2229                 }
2230
2231                 sbi->s_udfrev = minUDFWriteRev;
2232
2233                 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
2234                         UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
2235                 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
2236                         UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
2237         }
2238
2239         if (!sbi->s_partitions) {
2240                 udf_warn(sb, "No partition found (2)\n");
2241                 ret = -EINVAL;
2242                 goto error_out;
2243         }
2244
2245         if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
2246                         UDF_PART_FLAG_READ_ONLY &&
2247             !sb_rdonly(sb)) {
2248                 ret = -EACCES;
2249                 goto error_out;
2250         }
2251
2252         if (udf_find_fileset(sb, &fileset, &rootdir)) {
2253                 udf_warn(sb, "No fileset found\n");
2254                 ret = -EINVAL;
2255                 goto error_out;
2256         }
2257
2258         if (!silent) {
2259                 struct timestamp ts;
2260                 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
2261                 udf_info("Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
2262                          sbi->s_volume_ident,
2263                          le16_to_cpu(ts.year), ts.month, ts.day,
2264                          ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
2265         }
2266         if (!sb_rdonly(sb)) {
2267                 udf_open_lvid(sb);
2268                 lvid_open = true;
2269         }
2270
2271         /* Assign the root inode */
2272         /* assign inodes by physical block number */
2273         /* perhaps it's not extensible enough, but for now ... */
2274         inode = udf_iget(sb, &rootdir);
2275         if (IS_ERR(inode)) {
2276                 udf_err(sb, "Error in udf_iget, block=%d, partition=%d\n",
2277                        rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
2278                 ret = PTR_ERR(inode);
2279                 goto error_out;
2280         }
2281
2282         /* Allocate a dentry for the root inode */
2283         sb->s_root = d_make_root(inode);
2284         if (!sb->s_root) {
2285                 udf_err(sb, "Couldn't allocate root dentry\n");
2286                 ret = -ENOMEM;
2287                 goto error_out;
2288         }
2289         sb->s_maxbytes = MAX_LFS_FILESIZE;
2290         sb->s_max_links = UDF_MAX_LINKS;
2291         return 0;
2292
2293 error_out:
2294         iput(sbi->s_vat_inode);
2295 parse_options_failure:
2296 #ifdef CONFIG_UDF_NLS
2297         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2298                 unload_nls(sbi->s_nls_map);
2299 #endif
2300         if (lvid_open)
2301                 udf_close_lvid(sb);
2302         brelse(sbi->s_lvid_bh);
2303         udf_sb_free_partitions(sb);
2304         kfree(sbi);
2305         sb->s_fs_info = NULL;
2306
2307         return ret;
2308 }
2309
2310 void _udf_err(struct super_block *sb, const char *function,
2311               const char *fmt, ...)
2312 {
2313         struct va_format vaf;
2314         va_list args;
2315
2316         va_start(args, fmt);
2317
2318         vaf.fmt = fmt;
2319         vaf.va = &args;
2320
2321         pr_err("error (device %s): %s: %pV", sb->s_id, function, &vaf);
2322
2323         va_end(args);
2324 }
2325
2326 void _udf_warn(struct super_block *sb, const char *function,
2327                const char *fmt, ...)
2328 {
2329         struct va_format vaf;
2330         va_list args;
2331
2332         va_start(args, fmt);
2333
2334         vaf.fmt = fmt;
2335         vaf.va = &args;
2336
2337         pr_warn("warning (device %s): %s: %pV", sb->s_id, function, &vaf);
2338
2339         va_end(args);
2340 }
2341
2342 static void udf_put_super(struct super_block *sb)
2343 {
2344         struct udf_sb_info *sbi;
2345
2346         sbi = UDF_SB(sb);
2347
2348         iput(sbi->s_vat_inode);
2349 #ifdef CONFIG_UDF_NLS
2350         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2351                 unload_nls(sbi->s_nls_map);
2352 #endif
2353         if (!sb_rdonly(sb))
2354                 udf_close_lvid(sb);
2355         brelse(sbi->s_lvid_bh);
2356         udf_sb_free_partitions(sb);
2357         mutex_destroy(&sbi->s_alloc_mutex);
2358         kfree(sb->s_fs_info);
2359         sb->s_fs_info = NULL;
2360 }
2361
2362 static int udf_sync_fs(struct super_block *sb, int wait)
2363 {
2364         struct udf_sb_info *sbi = UDF_SB(sb);
2365
2366         mutex_lock(&sbi->s_alloc_mutex);
2367         if (sbi->s_lvid_dirty) {
2368                 /*
2369                  * Blockdevice will be synced later so we don't have to submit
2370                  * the buffer for IO
2371                  */
2372                 mark_buffer_dirty(sbi->s_lvid_bh);
2373                 sbi->s_lvid_dirty = 0;
2374         }
2375         mutex_unlock(&sbi->s_alloc_mutex);
2376
2377         return 0;
2378 }
2379
2380 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
2381 {
2382         struct super_block *sb = dentry->d_sb;
2383         struct udf_sb_info *sbi = UDF_SB(sb);
2384         struct logicalVolIntegrityDescImpUse *lvidiu;
2385         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
2386
2387         lvidiu = udf_sb_lvidiu(sb);
2388         buf->f_type = UDF_SUPER_MAGIC;
2389         buf->f_bsize = sb->s_blocksize;
2390         buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
2391         buf->f_bfree = udf_count_free(sb);
2392         buf->f_bavail = buf->f_bfree;
2393         buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2394                                           le32_to_cpu(lvidiu->numDirs)) : 0)
2395                         + buf->f_bfree;
2396         buf->f_ffree = buf->f_bfree;
2397         buf->f_namelen = UDF_NAME_LEN;
2398         buf->f_fsid.val[0] = (u32)id;
2399         buf->f_fsid.val[1] = (u32)(id >> 32);
2400
2401         return 0;
2402 }
2403
2404 static unsigned int udf_count_free_bitmap(struct super_block *sb,
2405                                           struct udf_bitmap *bitmap)
2406 {
2407         struct buffer_head *bh = NULL;
2408         unsigned int accum = 0;
2409         int index;
2410         int block = 0, newblock;
2411         struct kernel_lb_addr loc;
2412         uint32_t bytes;
2413         uint8_t *ptr;
2414         uint16_t ident;
2415         struct spaceBitmapDesc *bm;
2416
2417         loc.logicalBlockNum = bitmap->s_extPosition;
2418         loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
2419         bh = udf_read_ptagged(sb, &loc, 0, &ident);
2420
2421         if (!bh) {
2422                 udf_err(sb, "udf_count_free failed\n");
2423                 goto out;
2424         } else if (ident != TAG_IDENT_SBD) {
2425                 brelse(bh);
2426                 udf_err(sb, "udf_count_free failed\n");
2427                 goto out;
2428         }
2429
2430         bm = (struct spaceBitmapDesc *)bh->b_data;
2431         bytes = le32_to_cpu(bm->numOfBytes);
2432         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2433         ptr = (uint8_t *)bh->b_data;
2434
2435         while (bytes > 0) {
2436                 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2437                 accum += bitmap_weight((const unsigned long *)(ptr + index),
2438                                         cur_bytes * 8);
2439                 bytes -= cur_bytes;
2440                 if (bytes) {
2441                         brelse(bh);
2442                         newblock = udf_get_lb_pblock(sb, &loc, ++block);
2443                         bh = udf_tread(sb, newblock);
2444                         if (!bh) {
2445                                 udf_debug("read failed\n");
2446                                 goto out;
2447                         }
2448                         index = 0;
2449                         ptr = (uint8_t *)bh->b_data;
2450                 }
2451         }
2452         brelse(bh);
2453 out:
2454         return accum;
2455 }
2456
2457 static unsigned int udf_count_free_table(struct super_block *sb,
2458                                          struct inode *table)
2459 {
2460         unsigned int accum = 0;
2461         uint32_t elen;
2462         struct kernel_lb_addr eloc;
2463         int8_t etype;
2464         struct extent_position epos;
2465
2466         mutex_lock(&UDF_SB(sb)->s_alloc_mutex);
2467         epos.block = UDF_I(table)->i_location;
2468         epos.offset = sizeof(struct unallocSpaceEntry);
2469         epos.bh = NULL;
2470
2471         while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2472                 accum += (elen >> table->i_sb->s_blocksize_bits);
2473
2474         brelse(epos.bh);
2475         mutex_unlock(&UDF_SB(sb)->s_alloc_mutex);
2476
2477         return accum;
2478 }
2479
2480 static unsigned int udf_count_free(struct super_block *sb)
2481 {
2482         unsigned int accum = 0;
2483         struct udf_sb_info *sbi = UDF_SB(sb);
2484         struct udf_part_map *map;
2485         unsigned int part = sbi->s_partition;
2486         int ptype = sbi->s_partmaps[part].s_partition_type;
2487
2488         if (ptype == UDF_METADATA_MAP25) {
2489                 part = sbi->s_partmaps[part].s_type_specific.s_metadata.
2490                                                         s_phys_partition_ref;
2491         } else if (ptype == UDF_VIRTUAL_MAP15 || ptype == UDF_VIRTUAL_MAP20) {
2492                 /*
2493                  * Filesystems with VAT are append-only and we cannot write to
2494                  * them. Let's just report 0 here.
2495                  */
2496                 return 0;
2497         }
2498
2499         if (sbi->s_lvid_bh) {
2500                 struct logicalVolIntegrityDesc *lvid =
2501                         (struct logicalVolIntegrityDesc *)
2502                         sbi->s_lvid_bh->b_data;
2503                 if (le32_to_cpu(lvid->numOfPartitions) > part) {
2504                         accum = le32_to_cpu(
2505                                         lvid->freeSpaceTable[part]);
2506                         if (accum == 0xFFFFFFFF)
2507                                 accum = 0;
2508                 }
2509         }
2510
2511         if (accum)
2512                 return accum;
2513
2514         map = &sbi->s_partmaps[part];
2515         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2516                 accum += udf_count_free_bitmap(sb,
2517                                                map->s_uspace.s_bitmap);
2518         }
2519         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
2520                 accum += udf_count_free_bitmap(sb,
2521                                                map->s_fspace.s_bitmap);
2522         }
2523         if (accum)
2524                 return accum;
2525
2526         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2527                 accum += udf_count_free_table(sb,
2528                                               map->s_uspace.s_table);
2529         }
2530         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
2531                 accum += udf_count_free_table(sb,
2532                                               map->s_fspace.s_table);
2533         }
2534
2535         return accum;
2536 }
2537
2538 MODULE_AUTHOR("Ben Fennema");
2539 MODULE_DESCRIPTION("Universal Disk Format Filesystem");
2540 MODULE_LICENSE("GPL");
2541 module_init(init_udf_fs)
2542 module_exit(exit_udf_fs)