1 /* 2 * super.c 3 * 4 * PURPOSE 5 * Super block routines for the OSTA-UDF(tm) filesystem. 6 * 7 * DESCRIPTION 8 * OSTA-UDF(tm) = Optical Storage Technology Association 9 * Universal Disk Format. 10 * 11 * This code is based on version 2.00 of the UDF specification, 12 * and revision 3 of the ECMA 167 standard [equivalent to ISO 13346]. 13 * http://www.osta.org/ 14 * http://www.ecma.ch/ 15 * http://www.iso.org/ 16 * 17 * COPYRIGHT 18 * This file is distributed under the terms of the GNU General Public 19 * License (GPL). Copies of the GPL can be obtained from: 20 * ftp://prep.ai.mit.edu/pub/gnu/GPL 21 * Each contributing author retains all rights to their own work. 22 * 23 * (C) 1998 Dave Boynton 24 * (C) 1998-2004 Ben Fennema 25 * (C) 2000 Stelias Computing Inc 26 * 27 * HISTORY 28 * 29 * 09/24/98 dgb changed to allow compiling outside of kernel, and 30 * added some debugging. 31 * 10/01/98 dgb updated to allow (some) possibility of compiling w/2.0.34 32 * 10/16/98 attempting some multi-session support 33 * 10/17/98 added freespace count for "df" 34 * 11/11/98 gr added novrs option 35 * 11/26/98 dgb added fileset,anchor mount options 36 * 12/06/98 blf really hosed things royally. vat/sparing support. sequenced 37 * vol descs. rewrote option handling based on isofs 38 * 12/20/98 find the free space bitmap (if it exists) 39 */ 40 41 #include "udfdecl.h" 42 43 #include <linux/blkdev.h> 44 #include <linux/slab.h> 45 #include <linux/kernel.h> 46 #include <linux/module.h> 47 #include <linux/parser.h> 48 #include <linux/stat.h> 49 #include <linux/cdrom.h> 50 #include <linux/nls.h> 51 #include <linux/vfs.h> 52 #include <linux/vmalloc.h> 53 #include <linux/errno.h> 54 #include <linux/mount.h> 55 #include <linux/seq_file.h> 56 #include <linux/bitmap.h> 57 #include <linux/crc-itu-t.h> 58 #include <linux/log2.h> 59 #include <asm/byteorder.h> 60 61 #include "udf_sb.h" 62 #include "udf_i.h" 63 64 #include <linux/init.h> 65 #include <linux/uaccess.h> 66 67 #define VDS_POS_PRIMARY_VOL_DESC 0 68 #define VDS_POS_UNALLOC_SPACE_DESC 1 69 #define VDS_POS_LOGICAL_VOL_DESC 2 70 #define VDS_POS_PARTITION_DESC 3 71 #define VDS_POS_IMP_USE_VOL_DESC 4 72 #define VDS_POS_VOL_DESC_PTR 5 73 #define VDS_POS_TERMINATING_DESC 6 74 #define VDS_POS_LENGTH 7 75 76 #define UDF_DEFAULT_BLOCKSIZE 2048 77 78 #define VSD_FIRST_SECTOR_OFFSET 32768 79 #define VSD_MAX_SECTOR_OFFSET 0x800000 80 81 enum { UDF_MAX_LINKS = 0xffff }; 82 83 /* These are the "meat" - everything else is stuffing */ 84 static int udf_fill_super(struct super_block *, void *, int); 85 static void udf_put_super(struct super_block *); 86 static int udf_sync_fs(struct super_block *, int); 87 static int udf_remount_fs(struct super_block *, int *, char *); 88 static void udf_load_logicalvolint(struct super_block *, struct kernel_extent_ad); 89 static int udf_find_fileset(struct super_block *, struct kernel_lb_addr *, 90 struct kernel_lb_addr *); 91 static void udf_load_fileset(struct super_block *, struct buffer_head *, 92 struct kernel_lb_addr *); 93 static void udf_open_lvid(struct super_block *); 94 static void udf_close_lvid(struct super_block *); 95 static unsigned int udf_count_free(struct super_block *); 96 static int udf_statfs(struct dentry *, struct kstatfs *); 97 static int udf_show_options(struct seq_file *, struct dentry *); 98 99 struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct super_block *sb) 100 { 101 struct logicalVolIntegrityDesc *lvid; 102 unsigned int partnum; 103 unsigned int offset; 104 105 if (!UDF_SB(sb)->s_lvid_bh) 106 return NULL; 107 lvid = (struct logicalVolIntegrityDesc *)UDF_SB(sb)->s_lvid_bh->b_data; 108 partnum = le32_to_cpu(lvid->numOfPartitions); 109 if ((sb->s_blocksize - sizeof(struct logicalVolIntegrityDescImpUse) - 110 offsetof(struct logicalVolIntegrityDesc, impUse)) / 111 (2 * sizeof(uint32_t)) < partnum) { 112 udf_err(sb, "Logical volume integrity descriptor corrupted " 113 "(numOfPartitions = %u)!\n", partnum); 114 return NULL; 115 } 116 /* The offset is to skip freeSpaceTable and sizeTable arrays */ 117 offset = partnum * 2 * sizeof(uint32_t); 118 return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]); 119 } 120 121 /* UDF filesystem type */ 122 static struct dentry *udf_mount(struct file_system_type *fs_type, 123 int flags, const char *dev_name, void *data) 124 { 125 return mount_bdev(fs_type, flags, dev_name, data, udf_fill_super); 126 } 127 128 static struct file_system_type udf_fstype = { 129 .owner = THIS_MODULE, 130 .name = "udf", 131 .mount = udf_mount, 132 .kill_sb = kill_block_super, 133 .fs_flags = FS_REQUIRES_DEV, 134 }; 135 MODULE_ALIAS_FS("udf"); 136 137 static struct kmem_cache *udf_inode_cachep; 138 139 static struct inode *udf_alloc_inode(struct super_block *sb) 140 { 141 struct udf_inode_info *ei; 142 ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL); 143 if (!ei) 144 return NULL; 145 146 ei->i_unique = 0; 147 ei->i_lenExtents = 0; 148 ei->i_next_alloc_block = 0; 149 ei->i_next_alloc_goal = 0; 150 ei->i_strat4096 = 0; 151 init_rwsem(&ei->i_data_sem); 152 ei->cached_extent.lstart = -1; 153 spin_lock_init(&ei->i_extent_cache_lock); 154 155 return &ei->vfs_inode; 156 } 157 158 static void udf_i_callback(struct rcu_head *head) 159 { 160 struct inode *inode = container_of(head, struct inode, i_rcu); 161 kmem_cache_free(udf_inode_cachep, UDF_I(inode)); 162 } 163 164 static void udf_destroy_inode(struct inode *inode) 165 { 166 call_rcu(&inode->i_rcu, udf_i_callback); 167 } 168 169 static void init_once(void *foo) 170 { 171 struct udf_inode_info *ei = (struct udf_inode_info *)foo; 172 173 ei->i_ext.i_data = NULL; 174 inode_init_once(&ei->vfs_inode); 175 } 176 177 static int __init init_inodecache(void) 178 { 179 udf_inode_cachep = kmem_cache_create("udf_inode_cache", 180 sizeof(struct udf_inode_info), 181 0, (SLAB_RECLAIM_ACCOUNT | 182 SLAB_MEM_SPREAD | 183 SLAB_ACCOUNT), 184 init_once); 185 if (!udf_inode_cachep) 186 return -ENOMEM; 187 return 0; 188 } 189 190 static void destroy_inodecache(void) 191 { 192 /* 193 * Make sure all delayed rcu free inodes are flushed before we 194 * destroy cache. 195 */ 196 rcu_barrier(); 197 kmem_cache_destroy(udf_inode_cachep); 198 } 199 200 /* Superblock operations */ 201 static const struct super_operations udf_sb_ops = { 202 .alloc_inode = udf_alloc_inode, 203 .destroy_inode = udf_destroy_inode, 204 .write_inode = udf_write_inode, 205 .evict_inode = udf_evict_inode, 206 .put_super = udf_put_super, 207 .sync_fs = udf_sync_fs, 208 .statfs = udf_statfs, 209 .remount_fs = udf_remount_fs, 210 .show_options = udf_show_options, 211 }; 212 213 struct udf_options { 214 unsigned char novrs; 215 unsigned int blocksize; 216 unsigned int session; 217 unsigned int lastblock; 218 unsigned int anchor; 219 unsigned int volume; 220 unsigned short partition; 221 unsigned int fileset; 222 unsigned int rootdir; 223 unsigned int flags; 224 umode_t umask; 225 kgid_t gid; 226 kuid_t uid; 227 umode_t fmode; 228 umode_t dmode; 229 struct nls_table *nls_map; 230 }; 231 232 static int __init init_udf_fs(void) 233 { 234 int err; 235 236 err = init_inodecache(); 237 if (err) 238 goto out1; 239 err = register_filesystem(&udf_fstype); 240 if (err) 241 goto out; 242 243 return 0; 244 245 out: 246 destroy_inodecache(); 247 248 out1: 249 return err; 250 } 251 252 static void __exit exit_udf_fs(void) 253 { 254 unregister_filesystem(&udf_fstype); 255 destroy_inodecache(); 256 } 257 258 module_init(init_udf_fs) 259 module_exit(exit_udf_fs) 260 261 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count) 262 { 263 struct udf_sb_info *sbi = UDF_SB(sb); 264 265 sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map), 266 GFP_KERNEL); 267 if (!sbi->s_partmaps) { 268 udf_err(sb, "Unable to allocate space for %d partition maps\n", 269 count); 270 sbi->s_partitions = 0; 271 return -ENOMEM; 272 } 273 274 sbi->s_partitions = count; 275 return 0; 276 } 277 278 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap) 279 { 280 int i; 281 int nr_groups = bitmap->s_nr_groups; 282 283 for (i = 0; i < nr_groups; i++) 284 if (bitmap->s_block_bitmap[i]) 285 brelse(bitmap->s_block_bitmap[i]); 286 287 kvfree(bitmap); 288 } 289 290 static void udf_free_partition(struct udf_part_map *map) 291 { 292 int i; 293 struct udf_meta_data *mdata; 294 295 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) 296 iput(map->s_uspace.s_table); 297 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) 298 iput(map->s_fspace.s_table); 299 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) 300 udf_sb_free_bitmap(map->s_uspace.s_bitmap); 301 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) 302 udf_sb_free_bitmap(map->s_fspace.s_bitmap); 303 if (map->s_partition_type == UDF_SPARABLE_MAP15) 304 for (i = 0; i < 4; i++) 305 brelse(map->s_type_specific.s_sparing.s_spar_map[i]); 306 else if (map->s_partition_type == UDF_METADATA_MAP25) { 307 mdata = &map->s_type_specific.s_metadata; 308 iput(mdata->s_metadata_fe); 309 mdata->s_metadata_fe = NULL; 310 311 iput(mdata->s_mirror_fe); 312 mdata->s_mirror_fe = NULL; 313 314 iput(mdata->s_bitmap_fe); 315 mdata->s_bitmap_fe = NULL; 316 } 317 } 318 319 static void udf_sb_free_partitions(struct super_block *sb) 320 { 321 struct udf_sb_info *sbi = UDF_SB(sb); 322 int i; 323 if (sbi->s_partmaps == NULL) 324 return; 325 for (i = 0; i < sbi->s_partitions; i++) 326 udf_free_partition(&sbi->s_partmaps[i]); 327 kfree(sbi->s_partmaps); 328 sbi->s_partmaps = NULL; 329 } 330 331 static int udf_show_options(struct seq_file *seq, struct dentry *root) 332 { 333 struct super_block *sb = root->d_sb; 334 struct udf_sb_info *sbi = UDF_SB(sb); 335 336 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT)) 337 seq_puts(seq, ",nostrict"); 338 if (UDF_QUERY_FLAG(sb, UDF_FLAG_BLOCKSIZE_SET)) 339 seq_printf(seq, ",bs=%lu", sb->s_blocksize); 340 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE)) 341 seq_puts(seq, ",unhide"); 342 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE)) 343 seq_puts(seq, ",undelete"); 344 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB)) 345 seq_puts(seq, ",noadinicb"); 346 if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD)) 347 seq_puts(seq, ",shortad"); 348 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET)) 349 seq_puts(seq, ",uid=forget"); 350 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_IGNORE)) 351 seq_puts(seq, ",uid=ignore"); 352 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET)) 353 seq_puts(seq, ",gid=forget"); 354 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE)) 355 seq_puts(seq, ",gid=ignore"); 356 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET)) 357 seq_printf(seq, ",uid=%u", from_kuid(&init_user_ns, sbi->s_uid)); 358 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET)) 359 seq_printf(seq, ",gid=%u", from_kgid(&init_user_ns, sbi->s_gid)); 360 if (sbi->s_umask != 0) 361 seq_printf(seq, ",umask=%ho", sbi->s_umask); 362 if (sbi->s_fmode != UDF_INVALID_MODE) 363 seq_printf(seq, ",mode=%ho", sbi->s_fmode); 364 if (sbi->s_dmode != UDF_INVALID_MODE) 365 seq_printf(seq, ",dmode=%ho", sbi->s_dmode); 366 if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET)) 367 seq_printf(seq, ",session=%u", sbi->s_session); 368 if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET)) 369 seq_printf(seq, ",lastblock=%u", sbi->s_last_block); 370 if (sbi->s_anchor != 0) 371 seq_printf(seq, ",anchor=%u", sbi->s_anchor); 372 /* 373 * volume, partition, fileset and rootdir seem to be ignored 374 * currently 375 */ 376 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8)) 377 seq_puts(seq, ",utf8"); 378 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map) 379 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset); 380 381 return 0; 382 } 383 384 /* 385 * udf_parse_options 386 * 387 * PURPOSE 388 * Parse mount options. 389 * 390 * DESCRIPTION 391 * The following mount options are supported: 392 * 393 * gid= Set the default group. 394 * umask= Set the default umask. 395 * mode= Set the default file permissions. 396 * dmode= Set the default directory permissions. 397 * uid= Set the default user. 398 * bs= Set the block size. 399 * unhide Show otherwise hidden files. 400 * undelete Show deleted files in lists. 401 * adinicb Embed data in the inode (default) 402 * noadinicb Don't embed data in the inode 403 * shortad Use short ad's 404 * longad Use long ad's (default) 405 * nostrict Unset strict conformance 406 * iocharset= Set the NLS character set 407 * 408 * The remaining are for debugging and disaster recovery: 409 * 410 * novrs Skip volume sequence recognition 411 * 412 * The following expect a offset from 0. 413 * 414 * session= Set the CDROM session (default= last session) 415 * anchor= Override standard anchor location. (default= 256) 416 * volume= Override the VolumeDesc location. (unused) 417 * partition= Override the PartitionDesc location. (unused) 418 * lastblock= Set the last block of the filesystem/ 419 * 420 * The following expect a offset from the partition root. 421 * 422 * fileset= Override the fileset block location. (unused) 423 * rootdir= Override the root directory location. (unused) 424 * WARNING: overriding the rootdir to a non-directory may 425 * yield highly unpredictable results. 426 * 427 * PRE-CONDITIONS 428 * options Pointer to mount options string. 429 * uopts Pointer to mount options variable. 430 * 431 * POST-CONDITIONS 432 * <return> 1 Mount options parsed okay. 433 * <return> 0 Error parsing mount options. 434 * 435 * HISTORY 436 * July 1, 1997 - Andrew E. Mileski 437 * Written, tested, and released. 438 */ 439 440 enum { 441 Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete, 442 Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad, 443 Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock, 444 Opt_anchor, Opt_volume, Opt_partition, Opt_fileset, 445 Opt_rootdir, Opt_utf8, Opt_iocharset, 446 Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore, 447 Opt_fmode, Opt_dmode 448 }; 449 450 static const match_table_t tokens = { 451 {Opt_novrs, "novrs"}, 452 {Opt_nostrict, "nostrict"}, 453 {Opt_bs, "bs=%u"}, 454 {Opt_unhide, "unhide"}, 455 {Opt_undelete, "undelete"}, 456 {Opt_noadinicb, "noadinicb"}, 457 {Opt_adinicb, "adinicb"}, 458 {Opt_shortad, "shortad"}, 459 {Opt_longad, "longad"}, 460 {Opt_uforget, "uid=forget"}, 461 {Opt_uignore, "uid=ignore"}, 462 {Opt_gforget, "gid=forget"}, 463 {Opt_gignore, "gid=ignore"}, 464 {Opt_gid, "gid=%u"}, 465 {Opt_uid, "uid=%u"}, 466 {Opt_umask, "umask=%o"}, 467 {Opt_session, "session=%u"}, 468 {Opt_lastblock, "lastblock=%u"}, 469 {Opt_anchor, "anchor=%u"}, 470 {Opt_volume, "volume=%u"}, 471 {Opt_partition, "partition=%u"}, 472 {Opt_fileset, "fileset=%u"}, 473 {Opt_rootdir, "rootdir=%u"}, 474 {Opt_utf8, "utf8"}, 475 {Opt_iocharset, "iocharset=%s"}, 476 {Opt_fmode, "mode=%o"}, 477 {Opt_dmode, "dmode=%o"}, 478 {Opt_err, NULL} 479 }; 480 481 static int udf_parse_options(char *options, struct udf_options *uopt, 482 bool remount) 483 { 484 char *p; 485 int option; 486 487 uopt->novrs = 0; 488 uopt->partition = 0xFFFF; 489 uopt->session = 0xFFFFFFFF; 490 uopt->lastblock = 0; 491 uopt->anchor = 0; 492 uopt->volume = 0xFFFFFFFF; 493 uopt->rootdir = 0xFFFFFFFF; 494 uopt->fileset = 0xFFFFFFFF; 495 uopt->nls_map = NULL; 496 497 if (!options) 498 return 1; 499 500 while ((p = strsep(&options, ",")) != NULL) { 501 substring_t args[MAX_OPT_ARGS]; 502 int token; 503 unsigned n; 504 if (!*p) 505 continue; 506 507 token = match_token(p, tokens, args); 508 switch (token) { 509 case Opt_novrs: 510 uopt->novrs = 1; 511 break; 512 case Opt_bs: 513 if (match_int(&args[0], &option)) 514 return 0; 515 n = option; 516 if (n != 512 && n != 1024 && n != 2048 && n != 4096) 517 return 0; 518 uopt->blocksize = n; 519 uopt->flags |= (1 << UDF_FLAG_BLOCKSIZE_SET); 520 break; 521 case Opt_unhide: 522 uopt->flags |= (1 << UDF_FLAG_UNHIDE); 523 break; 524 case Opt_undelete: 525 uopt->flags |= (1 << UDF_FLAG_UNDELETE); 526 break; 527 case Opt_noadinicb: 528 uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB); 529 break; 530 case Opt_adinicb: 531 uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB); 532 break; 533 case Opt_shortad: 534 uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD); 535 break; 536 case Opt_longad: 537 uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD); 538 break; 539 case Opt_gid: 540 if (match_int(args, &option)) 541 return 0; 542 uopt->gid = make_kgid(current_user_ns(), option); 543 if (!gid_valid(uopt->gid)) 544 return 0; 545 uopt->flags |= (1 << UDF_FLAG_GID_SET); 546 break; 547 case Opt_uid: 548 if (match_int(args, &option)) 549 return 0; 550 uopt->uid = make_kuid(current_user_ns(), option); 551 if (!uid_valid(uopt->uid)) 552 return 0; 553 uopt->flags |= (1 << UDF_FLAG_UID_SET); 554 break; 555 case Opt_umask: 556 if (match_octal(args, &option)) 557 return 0; 558 uopt->umask = option; 559 break; 560 case Opt_nostrict: 561 uopt->flags &= ~(1 << UDF_FLAG_STRICT); 562 break; 563 case Opt_session: 564 if (match_int(args, &option)) 565 return 0; 566 uopt->session = option; 567 if (!remount) 568 uopt->flags |= (1 << UDF_FLAG_SESSION_SET); 569 break; 570 case Opt_lastblock: 571 if (match_int(args, &option)) 572 return 0; 573 uopt->lastblock = option; 574 if (!remount) 575 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET); 576 break; 577 case Opt_anchor: 578 if (match_int(args, &option)) 579 return 0; 580 uopt->anchor = option; 581 break; 582 case Opt_volume: 583 if (match_int(args, &option)) 584 return 0; 585 uopt->volume = option; 586 break; 587 case Opt_partition: 588 if (match_int(args, &option)) 589 return 0; 590 uopt->partition = option; 591 break; 592 case Opt_fileset: 593 if (match_int(args, &option)) 594 return 0; 595 uopt->fileset = option; 596 break; 597 case Opt_rootdir: 598 if (match_int(args, &option)) 599 return 0; 600 uopt->rootdir = option; 601 break; 602 case Opt_utf8: 603 uopt->flags |= (1 << UDF_FLAG_UTF8); 604 break; 605 #ifdef CONFIG_UDF_NLS 606 case Opt_iocharset: 607 uopt->nls_map = load_nls(args[0].from); 608 uopt->flags |= (1 << UDF_FLAG_NLS_MAP); 609 break; 610 #endif 611 case Opt_uignore: 612 uopt->flags |= (1 << UDF_FLAG_UID_IGNORE); 613 break; 614 case Opt_uforget: 615 uopt->flags |= (1 << UDF_FLAG_UID_FORGET); 616 break; 617 case Opt_gignore: 618 uopt->flags |= (1 << UDF_FLAG_GID_IGNORE); 619 break; 620 case Opt_gforget: 621 uopt->flags |= (1 << UDF_FLAG_GID_FORGET); 622 break; 623 case Opt_fmode: 624 if (match_octal(args, &option)) 625 return 0; 626 uopt->fmode = option & 0777; 627 break; 628 case Opt_dmode: 629 if (match_octal(args, &option)) 630 return 0; 631 uopt->dmode = option & 0777; 632 break; 633 default: 634 pr_err("bad mount option \"%s\" or missing value\n", p); 635 return 0; 636 } 637 } 638 return 1; 639 } 640 641 static int udf_remount_fs(struct super_block *sb, int *flags, char *options) 642 { 643 struct udf_options uopt; 644 struct udf_sb_info *sbi = UDF_SB(sb); 645 int error = 0; 646 struct logicalVolIntegrityDescImpUse *lvidiu = udf_sb_lvidiu(sb); 647 648 sync_filesystem(sb); 649 if (lvidiu) { 650 int write_rev = le16_to_cpu(lvidiu->minUDFWriteRev); 651 if (write_rev > UDF_MAX_WRITE_VERSION && !(*flags & MS_RDONLY)) 652 return -EACCES; 653 } 654 655 uopt.flags = sbi->s_flags; 656 uopt.uid = sbi->s_uid; 657 uopt.gid = sbi->s_gid; 658 uopt.umask = sbi->s_umask; 659 uopt.fmode = sbi->s_fmode; 660 uopt.dmode = sbi->s_dmode; 661 662 if (!udf_parse_options(options, &uopt, true)) 663 return -EINVAL; 664 665 write_lock(&sbi->s_cred_lock); 666 sbi->s_flags = uopt.flags; 667 sbi->s_uid = uopt.uid; 668 sbi->s_gid = uopt.gid; 669 sbi->s_umask = uopt.umask; 670 sbi->s_fmode = uopt.fmode; 671 sbi->s_dmode = uopt.dmode; 672 write_unlock(&sbi->s_cred_lock); 673 674 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) 675 goto out_unlock; 676 677 if (*flags & MS_RDONLY) 678 udf_close_lvid(sb); 679 else 680 udf_open_lvid(sb); 681 682 out_unlock: 683 return error; 684 } 685 686 /* Check Volume Structure Descriptors (ECMA 167 2/9.1) */ 687 /* We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */ 688 static loff_t udf_check_vsd(struct super_block *sb) 689 { 690 struct volStructDesc *vsd = NULL; 691 loff_t sector = VSD_FIRST_SECTOR_OFFSET; 692 int sectorsize; 693 struct buffer_head *bh = NULL; 694 int nsr02 = 0; 695 int nsr03 = 0; 696 struct udf_sb_info *sbi; 697 698 sbi = UDF_SB(sb); 699 if (sb->s_blocksize < sizeof(struct volStructDesc)) 700 sectorsize = sizeof(struct volStructDesc); 701 else 702 sectorsize = sb->s_blocksize; 703 704 sector += (sbi->s_session << sb->s_blocksize_bits); 705 706 udf_debug("Starting at sector %u (%ld byte sectors)\n", 707 (unsigned int)(sector >> sb->s_blocksize_bits), 708 sb->s_blocksize); 709 /* Process the sequence (if applicable). The hard limit on the sector 710 * offset is arbitrary, hopefully large enough so that all valid UDF 711 * filesystems will be recognised. There is no mention of an upper 712 * bound to the size of the volume recognition area in the standard. 713 * The limit will prevent the code to read all the sectors of a 714 * specially crafted image (like a bluray disc full of CD001 sectors), 715 * potentially causing minutes or even hours of uninterruptible I/O 716 * activity. This actually happened with uninitialised SSD partitions 717 * (all 0xFF) before the check for the limit and all valid IDs were 718 * added */ 719 for (; !nsr02 && !nsr03 && sector < VSD_MAX_SECTOR_OFFSET; 720 sector += sectorsize) { 721 /* Read a block */ 722 bh = udf_tread(sb, sector >> sb->s_blocksize_bits); 723 if (!bh) 724 break; 725 726 /* Look for ISO descriptors */ 727 vsd = (struct volStructDesc *)(bh->b_data + 728 (sector & (sb->s_blocksize - 1))); 729 730 if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001, 731 VSD_STD_ID_LEN)) { 732 switch (vsd->structType) { 733 case 0: 734 udf_debug("ISO9660 Boot Record found\n"); 735 break; 736 case 1: 737 udf_debug("ISO9660 Primary Volume Descriptor found\n"); 738 break; 739 case 2: 740 udf_debug("ISO9660 Supplementary Volume Descriptor found\n"); 741 break; 742 case 3: 743 udf_debug("ISO9660 Volume Partition Descriptor found\n"); 744 break; 745 case 255: 746 udf_debug("ISO9660 Volume Descriptor Set Terminator found\n"); 747 break; 748 default: 749 udf_debug("ISO9660 VRS (%u) found\n", 750 vsd->structType); 751 break; 752 } 753 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01, 754 VSD_STD_ID_LEN)) 755 ; /* nothing */ 756 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01, 757 VSD_STD_ID_LEN)) { 758 brelse(bh); 759 break; 760 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02, 761 VSD_STD_ID_LEN)) 762 nsr02 = sector; 763 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03, 764 VSD_STD_ID_LEN)) 765 nsr03 = sector; 766 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BOOT2, 767 VSD_STD_ID_LEN)) 768 ; /* nothing */ 769 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CDW02, 770 VSD_STD_ID_LEN)) 771 ; /* nothing */ 772 else { 773 /* invalid id : end of volume recognition area */ 774 brelse(bh); 775 break; 776 } 777 brelse(bh); 778 } 779 780 if (nsr03) 781 return nsr03; 782 else if (nsr02) 783 return nsr02; 784 else if (!bh && sector - (sbi->s_session << sb->s_blocksize_bits) == 785 VSD_FIRST_SECTOR_OFFSET) 786 return -1; 787 else 788 return 0; 789 } 790 791 static int udf_find_fileset(struct super_block *sb, 792 struct kernel_lb_addr *fileset, 793 struct kernel_lb_addr *root) 794 { 795 struct buffer_head *bh = NULL; 796 long lastblock; 797 uint16_t ident; 798 struct udf_sb_info *sbi; 799 800 if (fileset->logicalBlockNum != 0xFFFFFFFF || 801 fileset->partitionReferenceNum != 0xFFFF) { 802 bh = udf_read_ptagged(sb, fileset, 0, &ident); 803 804 if (!bh) { 805 return 1; 806 } else if (ident != TAG_IDENT_FSD) { 807 brelse(bh); 808 return 1; 809 } 810 811 } 812 813 sbi = UDF_SB(sb); 814 if (!bh) { 815 /* Search backwards through the partitions */ 816 struct kernel_lb_addr newfileset; 817 818 /* --> cvg: FIXME - is it reasonable? */ 819 return 1; 820 821 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1; 822 (newfileset.partitionReferenceNum != 0xFFFF && 823 fileset->logicalBlockNum == 0xFFFFFFFF && 824 fileset->partitionReferenceNum == 0xFFFF); 825 newfileset.partitionReferenceNum--) { 826 lastblock = sbi->s_partmaps 827 [newfileset.partitionReferenceNum] 828 .s_partition_len; 829 newfileset.logicalBlockNum = 0; 830 831 do { 832 bh = udf_read_ptagged(sb, &newfileset, 0, 833 &ident); 834 if (!bh) { 835 newfileset.logicalBlockNum++; 836 continue; 837 } 838 839 switch (ident) { 840 case TAG_IDENT_SBD: 841 { 842 struct spaceBitmapDesc *sp; 843 sp = (struct spaceBitmapDesc *) 844 bh->b_data; 845 newfileset.logicalBlockNum += 1 + 846 ((le32_to_cpu(sp->numOfBytes) + 847 sizeof(struct spaceBitmapDesc) 848 - 1) >> sb->s_blocksize_bits); 849 brelse(bh); 850 break; 851 } 852 case TAG_IDENT_FSD: 853 *fileset = newfileset; 854 break; 855 default: 856 newfileset.logicalBlockNum++; 857 brelse(bh); 858 bh = NULL; 859 break; 860 } 861 } while (newfileset.logicalBlockNum < lastblock && 862 fileset->logicalBlockNum == 0xFFFFFFFF && 863 fileset->partitionReferenceNum == 0xFFFF); 864 } 865 } 866 867 if ((fileset->logicalBlockNum != 0xFFFFFFFF || 868 fileset->partitionReferenceNum != 0xFFFF) && bh) { 869 udf_debug("Fileset at block=%d, partition=%d\n", 870 fileset->logicalBlockNum, 871 fileset->partitionReferenceNum); 872 873 sbi->s_partition = fileset->partitionReferenceNum; 874 udf_load_fileset(sb, bh, root); 875 brelse(bh); 876 return 0; 877 } 878 return 1; 879 } 880 881 /* 882 * Load primary Volume Descriptor Sequence 883 * 884 * Return <0 on error, 0 on success. -EAGAIN is special meaning next sequence 885 * should be tried. 886 */ 887 static int udf_load_pvoldesc(struct super_block *sb, sector_t block) 888 { 889 struct primaryVolDesc *pvoldesc; 890 uint8_t *outstr; 891 struct buffer_head *bh; 892 uint16_t ident; 893 int ret = -ENOMEM; 894 895 outstr = kmalloc(128, GFP_NOFS); 896 if (!outstr) 897 return -ENOMEM; 898 899 bh = udf_read_tagged(sb, block, block, &ident); 900 if (!bh) { 901 ret = -EAGAIN; 902 goto out2; 903 } 904 905 if (ident != TAG_IDENT_PVD) { 906 ret = -EIO; 907 goto out_bh; 908 } 909 910 pvoldesc = (struct primaryVolDesc *)bh->b_data; 911 912 if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time, 913 pvoldesc->recordingDateAndTime)) { 914 #ifdef UDFFS_DEBUG 915 struct timestamp *ts = &pvoldesc->recordingDateAndTime; 916 udf_debug("recording time %04u/%02u/%02u %02u:%02u (%x)\n", 917 le16_to_cpu(ts->year), ts->month, ts->day, ts->hour, 918 ts->minute, le16_to_cpu(ts->typeAndTimezone)); 919 #endif 920 } 921 922 ret = udf_CS0toUTF8(outstr, 31, pvoldesc->volIdent, 32); 923 if (ret < 0) 924 goto out_bh; 925 926 strncpy(UDF_SB(sb)->s_volume_ident, outstr, ret); 927 udf_debug("volIdent[] = '%s'\n", UDF_SB(sb)->s_volume_ident); 928 929 ret = udf_CS0toUTF8(outstr, 127, pvoldesc->volSetIdent, 128); 930 if (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_num) 946 { 947 struct kernel_lb_addr addr; 948 struct inode *metadata_fe; 949 950 addr.logicalBlockNum = meta_file_loc; 951 addr.partitionReferenceNum = partition_num; 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 { 970 struct udf_sb_info *sbi = UDF_SB(sb); 971 struct udf_part_map *map; 972 struct udf_meta_data *mdata; 973 struct kernel_lb_addr addr; 974 struct inode *fe; 975 976 map = &sbi->s_partmaps[partition]; 977 mdata = &map->s_type_specific.s_metadata; 978 979 /* metadata address */ 980 udf_debug("Metadata file location: block = %d part = %d\n", 981 mdata->s_meta_file_loc, map->s_partition_num); 982 983 fe = udf_find_metadata_inode_efe(sb, mdata->s_meta_file_loc, 984 map->s_partition_num); 985 if (IS_ERR(fe)) { 986 /* mirror file entry */ 987 udf_debug("Mirror metadata file location: block = %d part = %d\n", 988 mdata->s_mirror_file_loc, map->s_partition_num); 989 990 fe = udf_find_metadata_inode_efe(sb, mdata->s_mirror_file_loc, 991 map->s_partition_num); 992 993 if (IS_ERR(fe)) { 994 udf_err(sb, "Both metadata and mirror metadata inode efe can not found\n"); 995 return PTR_ERR(fe); 996 } 997 mdata->s_mirror_fe = fe; 998 } else 999 mdata->s_metadata_fe = fe; 1000 1001 1002 /* 1003 * bitmap file entry 1004 * Note: 1005 * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102) 1006 */ 1007 if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) { 1008 addr.logicalBlockNum = mdata->s_bitmap_file_loc; 1009 addr.partitionReferenceNum = map->s_partition_num; 1010 1011 udf_debug("Bitmap file location: block = %d part = %d\n", 1012 addr.logicalBlockNum, addr.partitionReferenceNum); 1013 1014 fe = udf_iget_special(sb, &addr); 1015 if (IS_ERR(fe)) { 1016 if (sb->s_flags & MS_RDONLY) 1017 udf_warn(sb, "bitmap inode efe not found but it's ok since the disc is mounted read-only\n"); 1018 else { 1019 udf_err(sb, "bitmap inode efe not found and attempted read-write mount\n"); 1020 return PTR_ERR(fe); 1021 } 1022 } else 1023 mdata->s_bitmap_fe = fe; 1024 } 1025 1026 udf_debug("udf_load_metadata_files Ok\n"); 1027 return 0; 1028 } 1029 1030 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh, 1031 struct kernel_lb_addr *root) 1032 { 1033 struct fileSetDesc *fset; 1034 1035 fset = (struct fileSetDesc *)bh->b_data; 1036 1037 *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation); 1038 1039 UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum); 1040 1041 udf_debug("Rootdir at block=%d, partition=%d\n", 1042 root->logicalBlockNum, root->partitionReferenceNum); 1043 } 1044 1045 int udf_compute_nr_groups(struct super_block *sb, u32 partition) 1046 { 1047 struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition]; 1048 return DIV_ROUND_UP(map->s_partition_len + 1049 (sizeof(struct spaceBitmapDesc) << 3), 1050 sb->s_blocksize * 8); 1051 } 1052 1053 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index) 1054 { 1055 struct udf_bitmap *bitmap; 1056 int nr_groups; 1057 int size; 1058 1059 nr_groups = udf_compute_nr_groups(sb, index); 1060 size = sizeof(struct udf_bitmap) + 1061 (sizeof(struct buffer_head *) * nr_groups); 1062 1063 if (size <= PAGE_SIZE) 1064 bitmap = kzalloc(size, GFP_KERNEL); 1065 else 1066 bitmap = vzalloc(size); /* TODO: get rid of vzalloc */ 1067 1068 if (bitmap == NULL) 1069 return NULL; 1070 1071 bitmap->s_nr_groups = nr_groups; 1072 return bitmap; 1073 } 1074 1075 static int udf_fill_partdesc_info(struct super_block *sb, 1076 struct partitionDesc *p, int p_index) 1077 { 1078 struct udf_part_map *map; 1079 struct udf_sb_info *sbi = UDF_SB(sb); 1080 struct partitionHeaderDesc *phd; 1081 1082 map = &sbi->s_partmaps[p_index]; 1083 1084 map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */ 1085 map->s_partition_root = le32_to_cpu(p->partitionStartingLocation); 1086 1087 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY)) 1088 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY; 1089 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE)) 1090 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE; 1091 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE)) 1092 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE; 1093 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE)) 1094 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE; 1095 1096 udf_debug("Partition (%d type %x) starts at physical %d, block length %d\n", 1097 p_index, map->s_partition_type, 1098 map->s_partition_root, map->s_partition_len); 1099 1100 if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) && 1101 strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03)) 1102 return 0; 1103 1104 phd = (struct partitionHeaderDesc *)p->partitionContentsUse; 1105 if (phd->unallocSpaceTable.extLength) { 1106 struct kernel_lb_addr loc = { 1107 .logicalBlockNum = le32_to_cpu( 1108 phd->unallocSpaceTable.extPosition), 1109 .partitionReferenceNum = p_index, 1110 }; 1111 struct inode *inode; 1112 1113 inode = udf_iget_special(sb, &loc); 1114 if (IS_ERR(inode)) { 1115 udf_debug("cannot load unallocSpaceTable (part %d)\n", 1116 p_index); 1117 return PTR_ERR(inode); 1118 } 1119 map->s_uspace.s_table = inode; 1120 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE; 1121 udf_debug("unallocSpaceTable (part %d) @ %ld\n", 1122 p_index, map->s_uspace.s_table->i_ino); 1123 } 1124 1125 if (phd->unallocSpaceBitmap.extLength) { 1126 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index); 1127 if (!bitmap) 1128 return -ENOMEM; 1129 map->s_uspace.s_bitmap = bitmap; 1130 bitmap->s_extPosition = le32_to_cpu( 1131 phd->unallocSpaceBitmap.extPosition); 1132 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP; 1133 udf_debug("unallocSpaceBitmap (part %d) @ %d\n", 1134 p_index, bitmap->s_extPosition); 1135 } 1136 1137 if (phd->partitionIntegrityTable.extLength) 1138 udf_debug("partitionIntegrityTable (part %d)\n", p_index); 1139 1140 if (phd->freedSpaceTable.extLength) { 1141 struct kernel_lb_addr loc = { 1142 .logicalBlockNum = le32_to_cpu( 1143 phd->freedSpaceTable.extPosition), 1144 .partitionReferenceNum = p_index, 1145 }; 1146 struct inode *inode; 1147 1148 inode = udf_iget_special(sb, &loc); 1149 if (IS_ERR(inode)) { 1150 udf_debug("cannot load freedSpaceTable (part %d)\n", 1151 p_index); 1152 return PTR_ERR(inode); 1153 } 1154 map->s_fspace.s_table = inode; 1155 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE; 1156 udf_debug("freedSpaceTable (part %d) @ %ld\n", 1157 p_index, map->s_fspace.s_table->i_ino); 1158 } 1159 1160 if (phd->freedSpaceBitmap.extLength) { 1161 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index); 1162 if (!bitmap) 1163 return -ENOMEM; 1164 map->s_fspace.s_bitmap = bitmap; 1165 bitmap->s_extPosition = le32_to_cpu( 1166 phd->freedSpaceBitmap.extPosition); 1167 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP; 1168 udf_debug("freedSpaceBitmap (part %d) @ %d\n", 1169 p_index, bitmap->s_extPosition); 1170 } 1171 return 0; 1172 } 1173 1174 static void udf_find_vat_block(struct super_block *sb, int p_index, 1175 int type1_index, sector_t start_block) 1176 { 1177 struct udf_sb_info *sbi = UDF_SB(sb); 1178 struct udf_part_map *map = &sbi->s_partmaps[p_index]; 1179 sector_t vat_block; 1180 struct kernel_lb_addr ino; 1181 struct inode *inode; 1182 1183 /* 1184 * VAT file entry is in the last recorded block. Some broken disks have 1185 * it a few blocks before so try a bit harder... 1186 */ 1187 ino.partitionReferenceNum = type1_index; 1188 for (vat_block = start_block; 1189 vat_block >= map->s_partition_root && 1190 vat_block >= start_block - 3; vat_block--) { 1191 ino.logicalBlockNum = vat_block - map->s_partition_root; 1192 inode = udf_iget_special(sb, &ino); 1193 if (!IS_ERR(inode)) { 1194 sbi->s_vat_inode = inode; 1195 break; 1196 } 1197 } 1198 } 1199 1200 static int udf_load_vat(struct super_block *sb, int p_index, int type1_index) 1201 { 1202 struct udf_sb_info *sbi = UDF_SB(sb); 1203 struct udf_part_map *map = &sbi->s_partmaps[p_index]; 1204 struct buffer_head *bh = NULL; 1205 struct udf_inode_info *vati; 1206 uint32_t pos; 1207 struct virtualAllocationTable20 *vat20; 1208 sector_t blocks = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits; 1209 1210 udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block); 1211 if (!sbi->s_vat_inode && 1212 sbi->s_last_block != blocks - 1) { 1213 pr_notice("Failed to read VAT inode from the last recorded block (%lu), retrying with the last block of the device (%lu).\n", 1214 (unsigned long)sbi->s_last_block, 1215 (unsigned long)blocks - 1); 1216 udf_find_vat_block(sb, p_index, type1_index, blocks - 1); 1217 } 1218 if (!sbi->s_vat_inode) 1219 return -EIO; 1220 1221 if (map->s_partition_type == UDF_VIRTUAL_MAP15) { 1222 map->s_type_specific.s_virtual.s_start_offset = 0; 1223 map->s_type_specific.s_virtual.s_num_entries = 1224 (sbi->s_vat_inode->i_size - 36) >> 2; 1225 } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) { 1226 vati = UDF_I(sbi->s_vat_inode); 1227 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { 1228 pos = udf_block_map(sbi->s_vat_inode, 0); 1229 bh = sb_bread(sb, pos); 1230 if (!bh) 1231 return -EIO; 1232 vat20 = (struct virtualAllocationTable20 *)bh->b_data; 1233 } else { 1234 vat20 = (struct virtualAllocationTable20 *) 1235 vati->i_ext.i_data; 1236 } 1237 1238 map->s_type_specific.s_virtual.s_start_offset = 1239 le16_to_cpu(vat20->lengthHeader); 1240 map->s_type_specific.s_virtual.s_num_entries = 1241 (sbi->s_vat_inode->i_size - 1242 map->s_type_specific.s_virtual. 1243 s_start_offset) >> 2; 1244 brelse(bh); 1245 } 1246 return 0; 1247 } 1248 1249 /* 1250 * Load partition descriptor block 1251 * 1252 * Returns <0 on error, 0 on success, -EAGAIN is special - try next descriptor 1253 * sequence. 1254 */ 1255 static int udf_load_partdesc(struct super_block *sb, sector_t block) 1256 { 1257 struct buffer_head *bh; 1258 struct partitionDesc *p; 1259 struct udf_part_map *map; 1260 struct udf_sb_info *sbi = UDF_SB(sb); 1261 int i, type1_idx; 1262 uint16_t partitionNumber; 1263 uint16_t ident; 1264 int ret; 1265 1266 bh = udf_read_tagged(sb, block, block, &ident); 1267 if (!bh) 1268 return -EAGAIN; 1269 if (ident != TAG_IDENT_PD) { 1270 ret = 0; 1271 goto out_bh; 1272 } 1273 1274 p = (struct partitionDesc *)bh->b_data; 1275 partitionNumber = le16_to_cpu(p->partitionNumber); 1276 1277 /* First scan for TYPE1, SPARABLE and METADATA partitions */ 1278 for (i = 0; i < sbi->s_partitions; i++) { 1279 map = &sbi->s_partmaps[i]; 1280 udf_debug("Searching map: (%d == %d)\n", 1281 map->s_partition_num, partitionNumber); 1282 if (map->s_partition_num == partitionNumber && 1283 (map->s_partition_type == UDF_TYPE1_MAP15 || 1284 map->s_partition_type == UDF_SPARABLE_MAP15)) 1285 break; 1286 } 1287 1288 if (i >= sbi->s_partitions) { 1289 udf_debug("Partition (%d) not found in partition map\n", 1290 partitionNumber); 1291 ret = 0; 1292 goto out_bh; 1293 } 1294 1295 ret = udf_fill_partdesc_info(sb, p, i); 1296 if (ret < 0) 1297 goto out_bh; 1298 1299 /* 1300 * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and 1301 * PHYSICAL partitions are already set up 1302 */ 1303 type1_idx = i; 1304 #ifdef UDFFS_DEBUG 1305 map = NULL; /* supress 'maybe used uninitialized' warning */ 1306 #endif 1307 for (i = 0; i < sbi->s_partitions; i++) { 1308 map = &sbi->s_partmaps[i]; 1309 1310 if (map->s_partition_num == partitionNumber && 1311 (map->s_partition_type == UDF_VIRTUAL_MAP15 || 1312 map->s_partition_type == UDF_VIRTUAL_MAP20 || 1313 map->s_partition_type == UDF_METADATA_MAP25)) 1314 break; 1315 } 1316 1317 if (i >= sbi->s_partitions) { 1318 ret = 0; 1319 goto out_bh; 1320 } 1321 1322 ret = udf_fill_partdesc_info(sb, p, i); 1323 if (ret < 0) 1324 goto out_bh; 1325 1326 if (map->s_partition_type == UDF_METADATA_MAP25) { 1327 ret = udf_load_metadata_files(sb, i); 1328 if (ret < 0) { 1329 udf_err(sb, "error loading MetaData partition map %d\n", 1330 i); 1331 goto out_bh; 1332 } 1333 } else { 1334 /* 1335 * If we have a partition with virtual map, we don't handle 1336 * writing to it (we overwrite blocks instead of relocating 1337 * them). 1338 */ 1339 if (!(sb->s_flags & MS_RDONLY)) { 1340 ret = -EACCES; 1341 goto out_bh; 1342 } 1343 ret = udf_load_vat(sb, i, type1_idx); 1344 if (ret < 0) 1345 goto out_bh; 1346 } 1347 ret = 0; 1348 out_bh: 1349 /* In case loading failed, we handle cleanup in udf_fill_super */ 1350 brelse(bh); 1351 return ret; 1352 } 1353 1354 static int udf_load_sparable_map(struct super_block *sb, 1355 struct udf_part_map *map, 1356 struct sparablePartitionMap *spm) 1357 { 1358 uint32_t loc; 1359 uint16_t ident; 1360 struct sparingTable *st; 1361 struct udf_sparing_data *sdata = &map->s_type_specific.s_sparing; 1362 int i; 1363 struct buffer_head *bh; 1364 1365 map->s_partition_type = UDF_SPARABLE_MAP15; 1366 sdata->s_packet_len = le16_to_cpu(spm->packetLength); 1367 if (!is_power_of_2(sdata->s_packet_len)) { 1368 udf_err(sb, "error loading logical volume descriptor: " 1369 "Invalid packet length %u\n", 1370 (unsigned)sdata->s_packet_len); 1371 return -EIO; 1372 } 1373 if (spm->numSparingTables > 4) { 1374 udf_err(sb, "error loading logical volume descriptor: " 1375 "Too many sparing tables (%d)\n", 1376 (int)spm->numSparingTables); 1377 return -EIO; 1378 } 1379 1380 for (i = 0; i < spm->numSparingTables; i++) { 1381 loc = le32_to_cpu(spm->locSparingTable[i]); 1382 bh = udf_read_tagged(sb, loc, loc, &ident); 1383 if (!bh) 1384 continue; 1385 1386 st = (struct sparingTable *)bh->b_data; 1387 if (ident != 0 || 1388 strncmp(st->sparingIdent.ident, UDF_ID_SPARING, 1389 strlen(UDF_ID_SPARING)) || 1390 sizeof(*st) + le16_to_cpu(st->reallocationTableLen) > 1391 sb->s_blocksize) { 1392 brelse(bh); 1393 continue; 1394 } 1395 1396 sdata->s_spar_map[i] = bh; 1397 } 1398 map->s_partition_func = udf_get_pblock_spar15; 1399 return 0; 1400 } 1401 1402 static int udf_load_logicalvol(struct super_block *sb, sector_t block, 1403 struct kernel_lb_addr *fileset) 1404 { 1405 struct logicalVolDesc *lvd; 1406 int i, offset; 1407 uint8_t type; 1408 struct udf_sb_info *sbi = UDF_SB(sb); 1409 struct genericPartitionMap *gpm; 1410 uint16_t ident; 1411 struct buffer_head *bh; 1412 unsigned int table_len; 1413 int ret; 1414 1415 bh = udf_read_tagged(sb, block, block, &ident); 1416 if (!bh) 1417 return -EAGAIN; 1418 BUG_ON(ident != TAG_IDENT_LVD); 1419 lvd = (struct logicalVolDesc *)bh->b_data; 1420 table_len = le32_to_cpu(lvd->mapTableLength); 1421 if (table_len > sb->s_blocksize - sizeof(*lvd)) { 1422 udf_err(sb, "error loading logical volume descriptor: " 1423 "Partition table too long (%u > %lu)\n", table_len, 1424 sb->s_blocksize - sizeof(*lvd)); 1425 ret = -EIO; 1426 goto out_bh; 1427 } 1428 1429 ret = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps)); 1430 if (ret) 1431 goto out_bh; 1432 1433 for (i = 0, offset = 0; 1434 i < sbi->s_partitions && offset < table_len; 1435 i++, offset += gpm->partitionMapLength) { 1436 struct udf_part_map *map = &sbi->s_partmaps[i]; 1437 gpm = (struct genericPartitionMap *) 1438 &(lvd->partitionMaps[offset]); 1439 type = gpm->partitionMapType; 1440 if (type == 1) { 1441 struct genericPartitionMap1 *gpm1 = 1442 (struct genericPartitionMap1 *)gpm; 1443 map->s_partition_type = UDF_TYPE1_MAP15; 1444 map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum); 1445 map->s_partition_num = le16_to_cpu(gpm1->partitionNum); 1446 map->s_partition_func = NULL; 1447 } else if (type == 2) { 1448 struct udfPartitionMap2 *upm2 = 1449 (struct udfPartitionMap2 *)gpm; 1450 if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL, 1451 strlen(UDF_ID_VIRTUAL))) { 1452 u16 suf = 1453 le16_to_cpu(((__le16 *)upm2->partIdent. 1454 identSuffix)[0]); 1455 if (suf < 0x0200) { 1456 map->s_partition_type = 1457 UDF_VIRTUAL_MAP15; 1458 map->s_partition_func = 1459 udf_get_pblock_virt15; 1460 } else { 1461 map->s_partition_type = 1462 UDF_VIRTUAL_MAP20; 1463 map->s_partition_func = 1464 udf_get_pblock_virt20; 1465 } 1466 } else if (!strncmp(upm2->partIdent.ident, 1467 UDF_ID_SPARABLE, 1468 strlen(UDF_ID_SPARABLE))) { 1469 ret = udf_load_sparable_map(sb, map, 1470 (struct sparablePartitionMap *)gpm); 1471 if (ret < 0) 1472 goto out_bh; 1473 } else if (!strncmp(upm2->partIdent.ident, 1474 UDF_ID_METADATA, 1475 strlen(UDF_ID_METADATA))) { 1476 struct udf_meta_data *mdata = 1477 &map->s_type_specific.s_metadata; 1478 struct metadataPartitionMap *mdm = 1479 (struct metadataPartitionMap *) 1480 &(lvd->partitionMaps[offset]); 1481 udf_debug("Parsing Logical vol part %d type %d id=%s\n", 1482 i, type, UDF_ID_METADATA); 1483 1484 map->s_partition_type = UDF_METADATA_MAP25; 1485 map->s_partition_func = udf_get_pblock_meta25; 1486 1487 mdata->s_meta_file_loc = 1488 le32_to_cpu(mdm->metadataFileLoc); 1489 mdata->s_mirror_file_loc = 1490 le32_to_cpu(mdm->metadataMirrorFileLoc); 1491 mdata->s_bitmap_file_loc = 1492 le32_to_cpu(mdm->metadataBitmapFileLoc); 1493 mdata->s_alloc_unit_size = 1494 le32_to_cpu(mdm->allocUnitSize); 1495 mdata->s_align_unit_size = 1496 le16_to_cpu(mdm->alignUnitSize); 1497 if (mdm->flags & 0x01) 1498 mdata->s_flags |= MF_DUPLICATE_MD; 1499 1500 udf_debug("Metadata Ident suffix=0x%x\n", 1501 le16_to_cpu(*(__le16 *) 1502 mdm->partIdent.identSuffix)); 1503 udf_debug("Metadata part num=%d\n", 1504 le16_to_cpu(mdm->partitionNum)); 1505 udf_debug("Metadata part alloc unit size=%d\n", 1506 le32_to_cpu(mdm->allocUnitSize)); 1507 udf_debug("Metadata file loc=%d\n", 1508 le32_to_cpu(mdm->metadataFileLoc)); 1509 udf_debug("Mirror file loc=%d\n", 1510 le32_to_cpu(mdm->metadataMirrorFileLoc)); 1511 udf_debug("Bitmap file loc=%d\n", 1512 le32_to_cpu(mdm->metadataBitmapFileLoc)); 1513 udf_debug("Flags: %d %d\n", 1514 mdata->s_flags, mdm->flags); 1515 } else { 1516 udf_debug("Unknown ident: %s\n", 1517 upm2->partIdent.ident); 1518 continue; 1519 } 1520 map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum); 1521 map->s_partition_num = le16_to_cpu(upm2->partitionNum); 1522 } 1523 udf_debug("Partition (%d:%d) type %d on volume %d\n", 1524 i, map->s_partition_num, type, map->s_volumeseqnum); 1525 } 1526 1527 if (fileset) { 1528 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]); 1529 1530 *fileset = lelb_to_cpu(la->extLocation); 1531 udf_debug("FileSet found in LogicalVolDesc at block=%d, partition=%d\n", 1532 fileset->logicalBlockNum, 1533 fileset->partitionReferenceNum); 1534 } 1535 if (lvd->integritySeqExt.extLength) 1536 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt)); 1537 ret = 0; 1538 out_bh: 1539 brelse(bh); 1540 return ret; 1541 } 1542 1543 /* 1544 * udf_load_logicalvolint 1545 * 1546 */ 1547 static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc) 1548 { 1549 struct buffer_head *bh = NULL; 1550 uint16_t ident; 1551 struct udf_sb_info *sbi = UDF_SB(sb); 1552 struct logicalVolIntegrityDesc *lvid; 1553 1554 while (loc.extLength > 0 && 1555 (bh = udf_read_tagged(sb, loc.extLocation, 1556 loc.extLocation, &ident)) && 1557 ident == TAG_IDENT_LVID) { 1558 sbi->s_lvid_bh = bh; 1559 lvid = (struct logicalVolIntegrityDesc *)bh->b_data; 1560 1561 if (lvid->nextIntegrityExt.extLength) 1562 udf_load_logicalvolint(sb, 1563 leea_to_cpu(lvid->nextIntegrityExt)); 1564 1565 if (sbi->s_lvid_bh != bh) 1566 brelse(bh); 1567 loc.extLength -= sb->s_blocksize; 1568 loc.extLocation++; 1569 } 1570 if (sbi->s_lvid_bh != bh) 1571 brelse(bh); 1572 } 1573 1574 /* 1575 * Maximum number of Terminating Descriptor redirections. The chosen number is 1576 * arbitrary - just that we hopefully don't limit any real use of rewritten 1577 * inode on write-once media but avoid looping for too long on corrupted media. 1578 */ 1579 #define UDF_MAX_TD_NESTING 64 1580 1581 /* 1582 * Process a main/reserve volume descriptor sequence. 1583 * @block First block of first extent of the sequence. 1584 * @lastblock Lastblock of first extent of the sequence. 1585 * @fileset There we store extent containing root fileset 1586 * 1587 * Returns <0 on error, 0 on success. -EAGAIN is special - try next descriptor 1588 * sequence 1589 */ 1590 static noinline int udf_process_sequence( 1591 struct super_block *sb, 1592 sector_t block, sector_t lastblock, 1593 struct kernel_lb_addr *fileset) 1594 { 1595 struct buffer_head *bh = NULL; 1596 struct udf_vds_record vds[VDS_POS_LENGTH]; 1597 struct udf_vds_record *curr; 1598 struct generic_desc *gd; 1599 struct volDescPtr *vdp; 1600 bool done = false; 1601 uint32_t vdsn; 1602 uint16_t ident; 1603 long next_s = 0, next_e = 0; 1604 int ret; 1605 unsigned int indirections = 0; 1606 1607 memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH); 1608 1609 /* 1610 * Read the main descriptor sequence and find which descriptors 1611 * are in it. 1612 */ 1613 for (; (!done && block <= lastblock); block++) { 1614 1615 bh = udf_read_tagged(sb, block, block, &ident); 1616 if (!bh) { 1617 udf_err(sb, 1618 "Block %llu of volume descriptor sequence is corrupted or we could not read it\n", 1619 (unsigned long long)block); 1620 return -EAGAIN; 1621 } 1622 1623 /* Process each descriptor (ISO 13346 3/8.3-8.4) */ 1624 gd = (struct generic_desc *)bh->b_data; 1625 vdsn = le32_to_cpu(gd->volDescSeqNum); 1626 switch (ident) { 1627 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */ 1628 curr = &vds[VDS_POS_PRIMARY_VOL_DESC]; 1629 if (vdsn >= curr->volDescSeqNum) { 1630 curr->volDescSeqNum = vdsn; 1631 curr->block = block; 1632 } 1633 break; 1634 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */ 1635 curr = &vds[VDS_POS_VOL_DESC_PTR]; 1636 if (vdsn >= curr->volDescSeqNum) { 1637 curr->volDescSeqNum = vdsn; 1638 curr->block = block; 1639 1640 vdp = (struct volDescPtr *)bh->b_data; 1641 next_s = le32_to_cpu( 1642 vdp->nextVolDescSeqExt.extLocation); 1643 next_e = le32_to_cpu( 1644 vdp->nextVolDescSeqExt.extLength); 1645 next_e = next_e >> sb->s_blocksize_bits; 1646 next_e += next_s; 1647 } 1648 break; 1649 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */ 1650 curr = &vds[VDS_POS_IMP_USE_VOL_DESC]; 1651 if (vdsn >= curr->volDescSeqNum) { 1652 curr->volDescSeqNum = vdsn; 1653 curr->block = block; 1654 } 1655 break; 1656 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */ 1657 curr = &vds[VDS_POS_PARTITION_DESC]; 1658 if (!curr->block) 1659 curr->block = block; 1660 break; 1661 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */ 1662 curr = &vds[VDS_POS_LOGICAL_VOL_DESC]; 1663 if (vdsn >= curr->volDescSeqNum) { 1664 curr->volDescSeqNum = vdsn; 1665 curr->block = block; 1666 } 1667 break; 1668 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */ 1669 curr = &vds[VDS_POS_UNALLOC_SPACE_DESC]; 1670 if (vdsn >= curr->volDescSeqNum) { 1671 curr->volDescSeqNum = vdsn; 1672 curr->block = block; 1673 } 1674 break; 1675 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */ 1676 if (++indirections > UDF_MAX_TD_NESTING) { 1677 udf_err(sb, "too many TDs (max %u supported)\n", UDF_MAX_TD_NESTING); 1678 brelse(bh); 1679 return -EIO; 1680 } 1681 1682 vds[VDS_POS_TERMINATING_DESC].block = block; 1683 if (next_e) { 1684 block = next_s; 1685 lastblock = next_e; 1686 next_s = next_e = 0; 1687 } else 1688 done = true; 1689 break; 1690 } 1691 brelse(bh); 1692 } 1693 /* 1694 * Now read interesting descriptors again and process them 1695 * in a suitable order 1696 */ 1697 if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) { 1698 udf_err(sb, "Primary Volume Descriptor not found!\n"); 1699 return -EAGAIN; 1700 } 1701 ret = udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block); 1702 if (ret < 0) 1703 return ret; 1704 1705 if (vds[VDS_POS_LOGICAL_VOL_DESC].block) { 1706 ret = udf_load_logicalvol(sb, 1707 vds[VDS_POS_LOGICAL_VOL_DESC].block, 1708 fileset); 1709 if (ret < 0) 1710 return ret; 1711 } 1712 1713 if (vds[VDS_POS_PARTITION_DESC].block) { 1714 /* 1715 * We rescan the whole descriptor sequence to find 1716 * partition descriptor blocks and process them. 1717 */ 1718 for (block = vds[VDS_POS_PARTITION_DESC].block; 1719 block < vds[VDS_POS_TERMINATING_DESC].block; 1720 block++) { 1721 ret = udf_load_partdesc(sb, block); 1722 if (ret < 0) 1723 return ret; 1724 } 1725 } 1726 1727 return 0; 1728 } 1729 1730 /* 1731 * Load Volume Descriptor Sequence described by anchor in bh 1732 * 1733 * Returns <0 on error, 0 on success 1734 */ 1735 static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh, 1736 struct kernel_lb_addr *fileset) 1737 { 1738 struct anchorVolDescPtr *anchor; 1739 sector_t main_s, main_e, reserve_s, reserve_e; 1740 int ret; 1741 1742 anchor = (struct anchorVolDescPtr *)bh->b_data; 1743 1744 /* Locate the main sequence */ 1745 main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation); 1746 main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength); 1747 main_e = main_e >> sb->s_blocksize_bits; 1748 main_e += main_s; 1749 1750 /* Locate the reserve sequence */ 1751 reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation); 1752 reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength); 1753 reserve_e = reserve_e >> sb->s_blocksize_bits; 1754 reserve_e += reserve_s; 1755 1756 /* Process the main & reserve sequences */ 1757 /* responsible for finding the PartitionDesc(s) */ 1758 ret = udf_process_sequence(sb, main_s, main_e, fileset); 1759 if (ret != -EAGAIN) 1760 return ret; 1761 udf_sb_free_partitions(sb); 1762 ret = udf_process_sequence(sb, reserve_s, reserve_e, fileset); 1763 if (ret < 0) { 1764 udf_sb_free_partitions(sb); 1765 /* No sequence was OK, return -EIO */ 1766 if (ret == -EAGAIN) 1767 ret = -EIO; 1768 } 1769 return ret; 1770 } 1771 1772 /* 1773 * Check whether there is an anchor block in the given block and 1774 * load Volume Descriptor Sequence if so. 1775 * 1776 * Returns <0 on error, 0 on success, -EAGAIN is special - try next anchor 1777 * block 1778 */ 1779 static int udf_check_anchor_block(struct super_block *sb, sector_t block, 1780 struct kernel_lb_addr *fileset) 1781 { 1782 struct buffer_head *bh; 1783 uint16_t ident; 1784 int ret; 1785 1786 if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) && 1787 udf_fixed_to_variable(block) >= 1788 sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits) 1789 return -EAGAIN; 1790 1791 bh = udf_read_tagged(sb, block, block, &ident); 1792 if (!bh) 1793 return -EAGAIN; 1794 if (ident != TAG_IDENT_AVDP) { 1795 brelse(bh); 1796 return -EAGAIN; 1797 } 1798 ret = udf_load_sequence(sb, bh, fileset); 1799 brelse(bh); 1800 return ret; 1801 } 1802 1803 /* 1804 * Search for an anchor volume descriptor pointer. 1805 * 1806 * Returns < 0 on error, 0 on success. -EAGAIN is special - try next set 1807 * of anchors. 1808 */ 1809 static int udf_scan_anchors(struct super_block *sb, sector_t *lastblock, 1810 struct kernel_lb_addr *fileset) 1811 { 1812 sector_t last[6]; 1813 int i; 1814 struct udf_sb_info *sbi = UDF_SB(sb); 1815 int last_count = 0; 1816 int ret; 1817 1818 /* First try user provided anchor */ 1819 if (sbi->s_anchor) { 1820 ret = udf_check_anchor_block(sb, sbi->s_anchor, fileset); 1821 if (ret != -EAGAIN) 1822 return ret; 1823 } 1824 /* 1825 * according to spec, anchor is in either: 1826 * block 256 1827 * lastblock-256 1828 * lastblock 1829 * however, if the disc isn't closed, it could be 512. 1830 */ 1831 ret = udf_check_anchor_block(sb, sbi->s_session + 256, fileset); 1832 if (ret != -EAGAIN) 1833 return ret; 1834 /* 1835 * The trouble is which block is the last one. Drives often misreport 1836 * this so we try various possibilities. 1837 */ 1838 last[last_count++] = *lastblock; 1839 if (*lastblock >= 1) 1840 last[last_count++] = *lastblock - 1; 1841 last[last_count++] = *lastblock + 1; 1842 if (*lastblock >= 2) 1843 last[last_count++] = *lastblock - 2; 1844 if (*lastblock >= 150) 1845 last[last_count++] = *lastblock - 150; 1846 if (*lastblock >= 152) 1847 last[last_count++] = *lastblock - 152; 1848 1849 for (i = 0; i < last_count; i++) { 1850 if (last[i] >= sb->s_bdev->bd_inode->i_size >> 1851 sb->s_blocksize_bits) 1852 continue; 1853 ret = udf_check_anchor_block(sb, last[i], fileset); 1854 if (ret != -EAGAIN) { 1855 if (!ret) 1856 *lastblock = last[i]; 1857 return ret; 1858 } 1859 if (last[i] < 256) 1860 continue; 1861 ret = udf_check_anchor_block(sb, last[i] - 256, fileset); 1862 if (ret != -EAGAIN) { 1863 if (!ret) 1864 *lastblock = last[i]; 1865 return ret; 1866 } 1867 } 1868 1869 /* Finally try block 512 in case media is open */ 1870 return udf_check_anchor_block(sb, sbi->s_session + 512, fileset); 1871 } 1872 1873 /* 1874 * Find an anchor volume descriptor and load Volume Descriptor Sequence from 1875 * area specified by it. The function expects sbi->s_lastblock to be the last 1876 * block on the media. 1877 * 1878 * Return <0 on error, 0 if anchor found. -EAGAIN is special meaning anchor 1879 * was not found. 1880 */ 1881 static int udf_find_anchor(struct super_block *sb, 1882 struct kernel_lb_addr *fileset) 1883 { 1884 struct udf_sb_info *sbi = UDF_SB(sb); 1885 sector_t lastblock = sbi->s_last_block; 1886 int ret; 1887 1888 ret = udf_scan_anchors(sb, &lastblock, fileset); 1889 if (ret != -EAGAIN) 1890 goto out; 1891 1892 /* No anchor found? Try VARCONV conversion of block numbers */ 1893 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV); 1894 lastblock = udf_variable_to_fixed(sbi->s_last_block); 1895 /* Firstly, we try to not convert number of the last block */ 1896 ret = udf_scan_anchors(sb, &lastblock, fileset); 1897 if (ret != -EAGAIN) 1898 goto out; 1899 1900 lastblock = sbi->s_last_block; 1901 /* Secondly, we try with converted number of the last block */ 1902 ret = udf_scan_anchors(sb, &lastblock, fileset); 1903 if (ret < 0) { 1904 /* VARCONV didn't help. Clear it. */ 1905 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV); 1906 } 1907 out: 1908 if (ret == 0) 1909 sbi->s_last_block = lastblock; 1910 return ret; 1911 } 1912 1913 /* 1914 * Check Volume Structure Descriptor, find Anchor block and load Volume 1915 * Descriptor Sequence. 1916 * 1917 * Returns < 0 on error, 0 on success. -EAGAIN is special meaning anchor 1918 * block was not found. 1919 */ 1920 static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt, 1921 int silent, struct kernel_lb_addr *fileset) 1922 { 1923 struct udf_sb_info *sbi = UDF_SB(sb); 1924 loff_t nsr_off; 1925 int ret; 1926 1927 if (!sb_set_blocksize(sb, uopt->blocksize)) { 1928 if (!silent) 1929 udf_warn(sb, "Bad block size\n"); 1930 return -EINVAL; 1931 } 1932 sbi->s_last_block = uopt->lastblock; 1933 if (!uopt->novrs) { 1934 /* Check that it is NSR02 compliant */ 1935 nsr_off = udf_check_vsd(sb); 1936 if (!nsr_off) { 1937 if (!silent) 1938 udf_warn(sb, "No VRS found\n"); 1939 return 0; 1940 } 1941 if (nsr_off == -1) 1942 udf_debug("Failed to read sector at offset %d. " 1943 "Assuming open disc. Skipping validity " 1944 "check\n", VSD_FIRST_SECTOR_OFFSET); 1945 if (!sbi->s_last_block) 1946 sbi->s_last_block = udf_get_last_block(sb); 1947 } else { 1948 udf_debug("Validity check skipped because of novrs option\n"); 1949 } 1950 1951 /* Look for anchor block and load Volume Descriptor Sequence */ 1952 sbi->s_anchor = uopt->anchor; 1953 ret = udf_find_anchor(sb, fileset); 1954 if (ret < 0) { 1955 if (!silent && ret == -EAGAIN) 1956 udf_warn(sb, "No anchor found\n"); 1957 return ret; 1958 } 1959 return 0; 1960 } 1961 1962 static void udf_open_lvid(struct super_block *sb) 1963 { 1964 struct udf_sb_info *sbi = UDF_SB(sb); 1965 struct buffer_head *bh = sbi->s_lvid_bh; 1966 struct logicalVolIntegrityDesc *lvid; 1967 struct logicalVolIntegrityDescImpUse *lvidiu; 1968 1969 if (!bh) 1970 return; 1971 lvid = (struct logicalVolIntegrityDesc *)bh->b_data; 1972 lvidiu = udf_sb_lvidiu(sb); 1973 if (!lvidiu) 1974 return; 1975 1976 mutex_lock(&sbi->s_alloc_mutex); 1977 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX; 1978 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX; 1979 udf_time_to_disk_stamp(&lvid->recordingDateAndTime, 1980 CURRENT_TIME); 1981 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN); 1982 1983 lvid->descTag.descCRC = cpu_to_le16( 1984 crc_itu_t(0, (char *)lvid + sizeof(struct tag), 1985 le16_to_cpu(lvid->descTag.descCRCLength))); 1986 1987 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag); 1988 mark_buffer_dirty(bh); 1989 sbi->s_lvid_dirty = 0; 1990 mutex_unlock(&sbi->s_alloc_mutex); 1991 /* Make opening of filesystem visible on the media immediately */ 1992 sync_dirty_buffer(bh); 1993 } 1994 1995 static void udf_close_lvid(struct super_block *sb) 1996 { 1997 struct udf_sb_info *sbi = UDF_SB(sb); 1998 struct buffer_head *bh = sbi->s_lvid_bh; 1999 struct logicalVolIntegrityDesc *lvid; 2000 struct logicalVolIntegrityDescImpUse *lvidiu; 2001 2002 if (!bh) 2003 return; 2004 lvid = (struct logicalVolIntegrityDesc *)bh->b_data; 2005 lvidiu = udf_sb_lvidiu(sb); 2006 if (!lvidiu) 2007 return; 2008 2009 mutex_lock(&sbi->s_alloc_mutex); 2010 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX; 2011 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX; 2012 udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME); 2013 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev)) 2014 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION); 2015 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev)) 2016 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev); 2017 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev)) 2018 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev); 2019 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE); 2020 2021 lvid->descTag.descCRC = cpu_to_le16( 2022 crc_itu_t(0, (char *)lvid + sizeof(struct tag), 2023 le16_to_cpu(lvid->descTag.descCRCLength))); 2024 2025 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag); 2026 /* 2027 * We set buffer uptodate unconditionally here to avoid spurious 2028 * warnings from mark_buffer_dirty() when previous EIO has marked 2029 * the buffer as !uptodate 2030 */ 2031 set_buffer_uptodate(bh); 2032 mark_buffer_dirty(bh); 2033 sbi->s_lvid_dirty = 0; 2034 mutex_unlock(&sbi->s_alloc_mutex); 2035 /* Make closing of filesystem visible on the media immediately */ 2036 sync_dirty_buffer(bh); 2037 } 2038 2039 u64 lvid_get_unique_id(struct super_block *sb) 2040 { 2041 struct buffer_head *bh; 2042 struct udf_sb_info *sbi = UDF_SB(sb); 2043 struct logicalVolIntegrityDesc *lvid; 2044 struct logicalVolHeaderDesc *lvhd; 2045 u64 uniqueID; 2046 u64 ret; 2047 2048 bh = sbi->s_lvid_bh; 2049 if (!bh) 2050 return 0; 2051 2052 lvid = (struct logicalVolIntegrityDesc *)bh->b_data; 2053 lvhd = (struct logicalVolHeaderDesc *)lvid->logicalVolContentsUse; 2054 2055 mutex_lock(&sbi->s_alloc_mutex); 2056 ret = uniqueID = le64_to_cpu(lvhd->uniqueID); 2057 if (!(++uniqueID & 0xFFFFFFFF)) 2058 uniqueID += 16; 2059 lvhd->uniqueID = cpu_to_le64(uniqueID); 2060 mutex_unlock(&sbi->s_alloc_mutex); 2061 mark_buffer_dirty(bh); 2062 2063 return ret; 2064 } 2065 2066 static int udf_fill_super(struct super_block *sb, void *options, int silent) 2067 { 2068 int ret = -EINVAL; 2069 struct inode *inode = NULL; 2070 struct udf_options uopt; 2071 struct kernel_lb_addr rootdir, fileset; 2072 struct udf_sb_info *sbi; 2073 bool lvid_open = false; 2074 2075 uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT); 2076 uopt.uid = INVALID_UID; 2077 uopt.gid = INVALID_GID; 2078 uopt.umask = 0; 2079 uopt.fmode = UDF_INVALID_MODE; 2080 uopt.dmode = UDF_INVALID_MODE; 2081 2082 sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL); 2083 if (!sbi) 2084 return -ENOMEM; 2085 2086 sb->s_fs_info = sbi; 2087 2088 mutex_init(&sbi->s_alloc_mutex); 2089 2090 if (!udf_parse_options((char *)options, &uopt, false)) 2091 goto parse_options_failure; 2092 2093 if (uopt.flags & (1 << UDF_FLAG_UTF8) && 2094 uopt.flags & (1 << UDF_FLAG_NLS_MAP)) { 2095 udf_err(sb, "utf8 cannot be combined with iocharset\n"); 2096 goto parse_options_failure; 2097 } 2098 #ifdef CONFIG_UDF_NLS 2099 if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) { 2100 uopt.nls_map = load_nls_default(); 2101 if (!uopt.nls_map) 2102 uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP); 2103 else 2104 udf_debug("Using default NLS map\n"); 2105 } 2106 #endif 2107 if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP))) 2108 uopt.flags |= (1 << UDF_FLAG_UTF8); 2109 2110 fileset.logicalBlockNum = 0xFFFFFFFF; 2111 fileset.partitionReferenceNum = 0xFFFF; 2112 2113 sbi->s_flags = uopt.flags; 2114 sbi->s_uid = uopt.uid; 2115 sbi->s_gid = uopt.gid; 2116 sbi->s_umask = uopt.umask; 2117 sbi->s_fmode = uopt.fmode; 2118 sbi->s_dmode = uopt.dmode; 2119 sbi->s_nls_map = uopt.nls_map; 2120 rwlock_init(&sbi->s_cred_lock); 2121 2122 if (uopt.session == 0xFFFFFFFF) 2123 sbi->s_session = udf_get_last_session(sb); 2124 else 2125 sbi->s_session = uopt.session; 2126 2127 udf_debug("Multi-session=%d\n", sbi->s_session); 2128 2129 /* Fill in the rest of the superblock */ 2130 sb->s_op = &udf_sb_ops; 2131 sb->s_export_op = &udf_export_ops; 2132 2133 sb->s_magic = UDF_SUPER_MAGIC; 2134 sb->s_time_gran = 1000; 2135 2136 if (uopt.flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) { 2137 ret = udf_load_vrs(sb, &uopt, silent, &fileset); 2138 } else { 2139 uopt.blocksize = bdev_logical_block_size(sb->s_bdev); 2140 ret = udf_load_vrs(sb, &uopt, silent, &fileset); 2141 if (ret == -EAGAIN && uopt.blocksize != UDF_DEFAULT_BLOCKSIZE) { 2142 if (!silent) 2143 pr_notice("Rescanning with blocksize %d\n", 2144 UDF_DEFAULT_BLOCKSIZE); 2145 brelse(sbi->s_lvid_bh); 2146 sbi->s_lvid_bh = NULL; 2147 uopt.blocksize = UDF_DEFAULT_BLOCKSIZE; 2148 ret = udf_load_vrs(sb, &uopt, silent, &fileset); 2149 } 2150 } 2151 if (ret < 0) { 2152 if (ret == -EAGAIN) { 2153 udf_warn(sb, "No partition found (1)\n"); 2154 ret = -EINVAL; 2155 } 2156 goto error_out; 2157 } 2158 2159 udf_debug("Lastblock=%d\n", sbi->s_last_block); 2160 2161 if (sbi->s_lvid_bh) { 2162 struct logicalVolIntegrityDescImpUse *lvidiu = 2163 udf_sb_lvidiu(sb); 2164 uint16_t minUDFReadRev; 2165 uint16_t minUDFWriteRev; 2166 2167 if (!lvidiu) { 2168 ret = -EINVAL; 2169 goto error_out; 2170 } 2171 minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev); 2172 minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev); 2173 if (minUDFReadRev > UDF_MAX_READ_VERSION) { 2174 udf_err(sb, "minUDFReadRev=%x (max is %x)\n", 2175 minUDFReadRev, 2176 UDF_MAX_READ_VERSION); 2177 ret = -EINVAL; 2178 goto error_out; 2179 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION && 2180 !(sb->s_flags & MS_RDONLY)) { 2181 ret = -EACCES; 2182 goto error_out; 2183 } 2184 2185 sbi->s_udfrev = minUDFWriteRev; 2186 2187 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE) 2188 UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE); 2189 if (minUDFReadRev >= UDF_VERS_USE_STREAMS) 2190 UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS); 2191 } 2192 2193 if (!sbi->s_partitions) { 2194 udf_warn(sb, "No partition found (2)\n"); 2195 ret = -EINVAL; 2196 goto error_out; 2197 } 2198 2199 if (sbi->s_partmaps[sbi->s_partition].s_partition_flags & 2200 UDF_PART_FLAG_READ_ONLY && 2201 !(sb->s_flags & MS_RDONLY)) { 2202 ret = -EACCES; 2203 goto error_out; 2204 } 2205 2206 if (udf_find_fileset(sb, &fileset, &rootdir)) { 2207 udf_warn(sb, "No fileset found\n"); 2208 ret = -EINVAL; 2209 goto error_out; 2210 } 2211 2212 if (!silent) { 2213 struct timestamp ts; 2214 udf_time_to_disk_stamp(&ts, sbi->s_record_time); 2215 udf_info("Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n", 2216 sbi->s_volume_ident, 2217 le16_to_cpu(ts.year), ts.month, ts.day, 2218 ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone)); 2219 } 2220 if (!(sb->s_flags & MS_RDONLY)) { 2221 udf_open_lvid(sb); 2222 lvid_open = true; 2223 } 2224 2225 /* Assign the root inode */ 2226 /* assign inodes by physical block number */ 2227 /* perhaps it's not extensible enough, but for now ... */ 2228 inode = udf_iget(sb, &rootdir); 2229 if (IS_ERR(inode)) { 2230 udf_err(sb, "Error in udf_iget, block=%d, partition=%d\n", 2231 rootdir.logicalBlockNum, rootdir.partitionReferenceNum); 2232 ret = PTR_ERR(inode); 2233 goto error_out; 2234 } 2235 2236 /* Allocate a dentry for the root inode */ 2237 sb->s_root = d_make_root(inode); 2238 if (!sb->s_root) { 2239 udf_err(sb, "Couldn't allocate root dentry\n"); 2240 ret = -ENOMEM; 2241 goto error_out; 2242 } 2243 sb->s_maxbytes = MAX_LFS_FILESIZE; 2244 sb->s_max_links = UDF_MAX_LINKS; 2245 return 0; 2246 2247 error_out: 2248 iput(sbi->s_vat_inode); 2249 parse_options_failure: 2250 #ifdef CONFIG_UDF_NLS 2251 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP)) 2252 unload_nls(sbi->s_nls_map); 2253 #endif 2254 if (lvid_open) 2255 udf_close_lvid(sb); 2256 brelse(sbi->s_lvid_bh); 2257 udf_sb_free_partitions(sb); 2258 kfree(sbi); 2259 sb->s_fs_info = NULL; 2260 2261 return ret; 2262 } 2263 2264 void _udf_err(struct super_block *sb, const char *function, 2265 const char *fmt, ...) 2266 { 2267 struct va_format vaf; 2268 va_list args; 2269 2270 va_start(args, fmt); 2271 2272 vaf.fmt = fmt; 2273 vaf.va = &args; 2274 2275 pr_err("error (device %s): %s: %pV", sb->s_id, function, &vaf); 2276 2277 va_end(args); 2278 } 2279 2280 void _udf_warn(struct super_block *sb, const char *function, 2281 const char *fmt, ...) 2282 { 2283 struct va_format vaf; 2284 va_list args; 2285 2286 va_start(args, fmt); 2287 2288 vaf.fmt = fmt; 2289 vaf.va = &args; 2290 2291 pr_warn("warning (device %s): %s: %pV", sb->s_id, function, &vaf); 2292 2293 va_end(args); 2294 } 2295 2296 static void udf_put_super(struct super_block *sb) 2297 { 2298 struct udf_sb_info *sbi; 2299 2300 sbi = UDF_SB(sb); 2301 2302 iput(sbi->s_vat_inode); 2303 #ifdef CONFIG_UDF_NLS 2304 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP)) 2305 unload_nls(sbi->s_nls_map); 2306 #endif 2307 if (!(sb->s_flags & MS_RDONLY)) 2308 udf_close_lvid(sb); 2309 brelse(sbi->s_lvid_bh); 2310 udf_sb_free_partitions(sb); 2311 mutex_destroy(&sbi->s_alloc_mutex); 2312 kfree(sb->s_fs_info); 2313 sb->s_fs_info = NULL; 2314 } 2315 2316 static int udf_sync_fs(struct super_block *sb, int wait) 2317 { 2318 struct udf_sb_info *sbi = UDF_SB(sb); 2319 2320 mutex_lock(&sbi->s_alloc_mutex); 2321 if (sbi->s_lvid_dirty) { 2322 /* 2323 * Blockdevice will be synced later so we don't have to submit 2324 * the buffer for IO 2325 */ 2326 mark_buffer_dirty(sbi->s_lvid_bh); 2327 sbi->s_lvid_dirty = 0; 2328 } 2329 mutex_unlock(&sbi->s_alloc_mutex); 2330 2331 return 0; 2332 } 2333 2334 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf) 2335 { 2336 struct super_block *sb = dentry->d_sb; 2337 struct udf_sb_info *sbi = UDF_SB(sb); 2338 struct logicalVolIntegrityDescImpUse *lvidiu; 2339 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 2340 2341 lvidiu = udf_sb_lvidiu(sb); 2342 buf->f_type = UDF_SUPER_MAGIC; 2343 buf->f_bsize = sb->s_blocksize; 2344 buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len; 2345 buf->f_bfree = udf_count_free(sb); 2346 buf->f_bavail = buf->f_bfree; 2347 buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) + 2348 le32_to_cpu(lvidiu->numDirs)) : 0) 2349 + buf->f_bfree; 2350 buf->f_ffree = buf->f_bfree; 2351 buf->f_namelen = UDF_NAME_LEN; 2352 buf->f_fsid.val[0] = (u32)id; 2353 buf->f_fsid.val[1] = (u32)(id >> 32); 2354 2355 return 0; 2356 } 2357 2358 static unsigned int udf_count_free_bitmap(struct super_block *sb, 2359 struct udf_bitmap *bitmap) 2360 { 2361 struct buffer_head *bh = NULL; 2362 unsigned int accum = 0; 2363 int index; 2364 int block = 0, newblock; 2365 struct kernel_lb_addr loc; 2366 uint32_t bytes; 2367 uint8_t *ptr; 2368 uint16_t ident; 2369 struct spaceBitmapDesc *bm; 2370 2371 loc.logicalBlockNum = bitmap->s_extPosition; 2372 loc.partitionReferenceNum = UDF_SB(sb)->s_partition; 2373 bh = udf_read_ptagged(sb, &loc, 0, &ident); 2374 2375 if (!bh) { 2376 udf_err(sb, "udf_count_free failed\n"); 2377 goto out; 2378 } else if (ident != TAG_IDENT_SBD) { 2379 brelse(bh); 2380 udf_err(sb, "udf_count_free failed\n"); 2381 goto out; 2382 } 2383 2384 bm = (struct spaceBitmapDesc *)bh->b_data; 2385 bytes = le32_to_cpu(bm->numOfBytes); 2386 index = sizeof(struct spaceBitmapDesc); /* offset in first block only */ 2387 ptr = (uint8_t *)bh->b_data; 2388 2389 while (bytes > 0) { 2390 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index); 2391 accum += bitmap_weight((const unsigned long *)(ptr + index), 2392 cur_bytes * 8); 2393 bytes -= cur_bytes; 2394 if (bytes) { 2395 brelse(bh); 2396 newblock = udf_get_lb_pblock(sb, &loc, ++block); 2397 bh = udf_tread(sb, newblock); 2398 if (!bh) { 2399 udf_debug("read failed\n"); 2400 goto out; 2401 } 2402 index = 0; 2403 ptr = (uint8_t *)bh->b_data; 2404 } 2405 } 2406 brelse(bh); 2407 out: 2408 return accum; 2409 } 2410 2411 static unsigned int udf_count_free_table(struct super_block *sb, 2412 struct inode *table) 2413 { 2414 unsigned int accum = 0; 2415 uint32_t elen; 2416 struct kernel_lb_addr eloc; 2417 int8_t etype; 2418 struct extent_position epos; 2419 2420 mutex_lock(&UDF_SB(sb)->s_alloc_mutex); 2421 epos.block = UDF_I(table)->i_location; 2422 epos.offset = sizeof(struct unallocSpaceEntry); 2423 epos.bh = NULL; 2424 2425 while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1) 2426 accum += (elen >> table->i_sb->s_blocksize_bits); 2427 2428 brelse(epos.bh); 2429 mutex_unlock(&UDF_SB(sb)->s_alloc_mutex); 2430 2431 return accum; 2432 } 2433 2434 static unsigned int udf_count_free(struct super_block *sb) 2435 { 2436 unsigned int accum = 0; 2437 struct udf_sb_info *sbi; 2438 struct udf_part_map *map; 2439 2440 sbi = UDF_SB(sb); 2441 if (sbi->s_lvid_bh) { 2442 struct logicalVolIntegrityDesc *lvid = 2443 (struct logicalVolIntegrityDesc *) 2444 sbi->s_lvid_bh->b_data; 2445 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) { 2446 accum = le32_to_cpu( 2447 lvid->freeSpaceTable[sbi->s_partition]); 2448 if (accum == 0xFFFFFFFF) 2449 accum = 0; 2450 } 2451 } 2452 2453 if (accum) 2454 return accum; 2455 2456 map = &sbi->s_partmaps[sbi->s_partition]; 2457 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) { 2458 accum += udf_count_free_bitmap(sb, 2459 map->s_uspace.s_bitmap); 2460 } 2461 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) { 2462 accum += udf_count_free_bitmap(sb, 2463 map->s_fspace.s_bitmap); 2464 } 2465 if (accum) 2466 return accum; 2467 2468 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) { 2469 accum += udf_count_free_table(sb, 2470 map->s_uspace.s_table); 2471 } 2472 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) { 2473 accum += udf_count_free_table(sb, 2474 map->s_fspace.s_table); 2475 } 2476 2477 return accum; 2478 } 2479