1 /* 2 * super.c 3 * 4 * PURPOSE 5 * Super block routines for the OSTA-UDF(tm) filesystem. 6 * 7 * DESCRIPTION 8 * OSTA-UDF(tm) = Optical Storage Technology Association 9 * Universal Disk Format. 10 * 11 * This code is based on version 2.00 of the UDF specification, 12 * and revision 3 of the ECMA 167 standard [equivalent to ISO 13346]. 13 * http://www.osta.org/ 14 * http://www.ecma.ch/ 15 * http://www.iso.org/ 16 * 17 * COPYRIGHT 18 * This file is distributed under the terms of the GNU General Public 19 * License (GPL). Copies of the GPL can be obtained from: 20 * ftp://prep.ai.mit.edu/pub/gnu/GPL 21 * Each contributing author retains all rights to their own work. 22 * 23 * (C) 1998 Dave Boynton 24 * (C) 1998-2004 Ben Fennema 25 * (C) 2000 Stelias Computing Inc 26 * 27 * HISTORY 28 * 29 * 09/24/98 dgb changed to allow compiling outside of kernel, and 30 * added some debugging. 31 * 10/01/98 dgb updated to allow (some) possibility of compiling w/2.0.34 32 * 10/16/98 attempting some multi-session support 33 * 10/17/98 added freespace count for "df" 34 * 11/11/98 gr added novrs option 35 * 11/26/98 dgb added fileset,anchor mount options 36 * 12/06/98 blf really hosed things royally. vat/sparing support. sequenced 37 * vol descs. rewrote option handling based on isofs 38 * 12/20/98 find the free space bitmap (if it exists) 39 */ 40 41 #include "udfdecl.h" 42 43 #include <linux/blkdev.h> 44 #include <linux/slab.h> 45 #include <linux/kernel.h> 46 #include <linux/module.h> 47 #include <linux/parser.h> 48 #include <linux/stat.h> 49 #include <linux/cdrom.h> 50 #include <linux/nls.h> 51 #include <linux/vfs.h> 52 #include <linux/vmalloc.h> 53 #include <linux/errno.h> 54 #include <linux/mount.h> 55 #include <linux/seq_file.h> 56 #include <linux/bitmap.h> 57 #include <linux/crc-itu-t.h> 58 #include <linux/log2.h> 59 #include <asm/byteorder.h> 60 61 #include "udf_sb.h" 62 #include "udf_i.h" 63 64 #include <linux/init.h> 65 #include <linux/uaccess.h> 66 67 enum { 68 VDS_POS_PRIMARY_VOL_DESC, 69 VDS_POS_UNALLOC_SPACE_DESC, 70 VDS_POS_LOGICAL_VOL_DESC, 71 VDS_POS_IMP_USE_VOL_DESC, 72 VDS_POS_LENGTH 73 }; 74 75 #define VSD_FIRST_SECTOR_OFFSET 32768 76 #define VSD_MAX_SECTOR_OFFSET 0x800000 77 78 /* 79 * Maximum number of Terminating Descriptor / Logical Volume Integrity 80 * Descriptor redirections. The chosen numbers are arbitrary - just that we 81 * hopefully don't limit any real use of rewritten inode on write-once media 82 * but avoid looping for too long on corrupted media. 83 */ 84 #define UDF_MAX_TD_NESTING 64 85 #define UDF_MAX_LVID_NESTING 1000 86 87 enum { UDF_MAX_LINKS = 0xffff }; 88 89 /* These are the "meat" - everything else is stuffing */ 90 static int udf_fill_super(struct super_block *, void *, int); 91 static void udf_put_super(struct super_block *); 92 static int udf_sync_fs(struct super_block *, int); 93 static int udf_remount_fs(struct super_block *, int *, char *); 94 static void udf_load_logicalvolint(struct super_block *, struct kernel_extent_ad); 95 static int udf_find_fileset(struct super_block *, struct kernel_lb_addr *, 96 struct kernel_lb_addr *); 97 static void udf_load_fileset(struct super_block *, struct buffer_head *, 98 struct kernel_lb_addr *); 99 static void udf_open_lvid(struct super_block *); 100 static void udf_close_lvid(struct super_block *); 101 static unsigned int udf_count_free(struct super_block *); 102 static int udf_statfs(struct dentry *, struct kstatfs *); 103 static int udf_show_options(struct seq_file *, struct dentry *); 104 105 struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct super_block *sb) 106 { 107 struct logicalVolIntegrityDesc *lvid; 108 unsigned int partnum; 109 unsigned int offset; 110 111 if (!UDF_SB(sb)->s_lvid_bh) 112 return NULL; 113 lvid = (struct logicalVolIntegrityDesc *)UDF_SB(sb)->s_lvid_bh->b_data; 114 partnum = le32_to_cpu(lvid->numOfPartitions); 115 if ((sb->s_blocksize - sizeof(struct logicalVolIntegrityDescImpUse) - 116 offsetof(struct logicalVolIntegrityDesc, impUse)) / 117 (2 * sizeof(uint32_t)) < partnum) { 118 udf_err(sb, "Logical volume integrity descriptor corrupted " 119 "(numOfPartitions = %u)!\n", partnum); 120 return NULL; 121 } 122 /* The offset is to skip freeSpaceTable and sizeTable arrays */ 123 offset = partnum * 2 * sizeof(uint32_t); 124 return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]); 125 } 126 127 /* UDF filesystem type */ 128 static struct dentry *udf_mount(struct file_system_type *fs_type, 129 int flags, const char *dev_name, void *data) 130 { 131 return mount_bdev(fs_type, flags, dev_name, data, udf_fill_super); 132 } 133 134 static struct file_system_type udf_fstype = { 135 .owner = THIS_MODULE, 136 .name = "udf", 137 .mount = udf_mount, 138 .kill_sb = kill_block_super, 139 .fs_flags = FS_REQUIRES_DEV, 140 }; 141 MODULE_ALIAS_FS("udf"); 142 143 static struct kmem_cache *udf_inode_cachep; 144 145 static struct inode *udf_alloc_inode(struct super_block *sb) 146 { 147 struct udf_inode_info *ei; 148 ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL); 149 if (!ei) 150 return NULL; 151 152 ei->i_unique = 0; 153 ei->i_lenExtents = 0; 154 ei->i_next_alloc_block = 0; 155 ei->i_next_alloc_goal = 0; 156 ei->i_strat4096 = 0; 157 init_rwsem(&ei->i_data_sem); 158 ei->cached_extent.lstart = -1; 159 spin_lock_init(&ei->i_extent_cache_lock); 160 161 return &ei->vfs_inode; 162 } 163 164 static void udf_free_in_core_inode(struct inode *inode) 165 { 166 kmem_cache_free(udf_inode_cachep, UDF_I(inode)); 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 .free_inode = udf_free_in_core_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 flags; 220 umode_t umask; 221 kgid_t gid; 222 kuid_t uid; 223 umode_t fmode; 224 umode_t dmode; 225 struct nls_table *nls_map; 226 }; 227 228 static int __init init_udf_fs(void) 229 { 230 int err; 231 232 err = init_inodecache(); 233 if (err) 234 goto out1; 235 err = register_filesystem(&udf_fstype); 236 if (err) 237 goto out; 238 239 return 0; 240 241 out: 242 destroy_inodecache(); 243 244 out1: 245 return err; 246 } 247 248 static void __exit exit_udf_fs(void) 249 { 250 unregister_filesystem(&udf_fstype); 251 destroy_inodecache(); 252 } 253 254 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count) 255 { 256 struct udf_sb_info *sbi = UDF_SB(sb); 257 258 sbi->s_partmaps = kcalloc(count, sizeof(*sbi->s_partmaps), GFP_KERNEL); 259 if (!sbi->s_partmaps) { 260 sbi->s_partitions = 0; 261 return -ENOMEM; 262 } 263 264 sbi->s_partitions = count; 265 return 0; 266 } 267 268 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap) 269 { 270 int i; 271 int nr_groups = bitmap->s_nr_groups; 272 273 for (i = 0; i < nr_groups; i++) 274 if (bitmap->s_block_bitmap[i]) 275 brelse(bitmap->s_block_bitmap[i]); 276 277 kvfree(bitmap); 278 } 279 280 static void udf_free_partition(struct udf_part_map *map) 281 { 282 int i; 283 struct udf_meta_data *mdata; 284 285 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) 286 iput(map->s_uspace.s_table); 287 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) 288 udf_sb_free_bitmap(map->s_uspace.s_bitmap); 289 if (map->s_partition_type == UDF_SPARABLE_MAP15) 290 for (i = 0; i < 4; i++) 291 brelse(map->s_type_specific.s_sparing.s_spar_map[i]); 292 else if (map->s_partition_type == UDF_METADATA_MAP25) { 293 mdata = &map->s_type_specific.s_metadata; 294 iput(mdata->s_metadata_fe); 295 mdata->s_metadata_fe = NULL; 296 297 iput(mdata->s_mirror_fe); 298 mdata->s_mirror_fe = NULL; 299 300 iput(mdata->s_bitmap_fe); 301 mdata->s_bitmap_fe = NULL; 302 } 303 } 304 305 static void udf_sb_free_partitions(struct super_block *sb) 306 { 307 struct udf_sb_info *sbi = UDF_SB(sb); 308 int i; 309 310 if (!sbi->s_partmaps) 311 return; 312 for (i = 0; i < sbi->s_partitions; i++) 313 udf_free_partition(&sbi->s_partmaps[i]); 314 kfree(sbi->s_partmaps); 315 sbi->s_partmaps = NULL; 316 } 317 318 static int udf_show_options(struct seq_file *seq, struct dentry *root) 319 { 320 struct super_block *sb = root->d_sb; 321 struct udf_sb_info *sbi = UDF_SB(sb); 322 323 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT)) 324 seq_puts(seq, ",nostrict"); 325 if (UDF_QUERY_FLAG(sb, UDF_FLAG_BLOCKSIZE_SET)) 326 seq_printf(seq, ",bs=%lu", sb->s_blocksize); 327 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE)) 328 seq_puts(seq, ",unhide"); 329 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE)) 330 seq_puts(seq, ",undelete"); 331 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB)) 332 seq_puts(seq, ",noadinicb"); 333 if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD)) 334 seq_puts(seq, ",shortad"); 335 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET)) 336 seq_puts(seq, ",uid=forget"); 337 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET)) 338 seq_puts(seq, ",gid=forget"); 339 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET)) 340 seq_printf(seq, ",uid=%u", from_kuid(&init_user_ns, sbi->s_uid)); 341 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET)) 342 seq_printf(seq, ",gid=%u", from_kgid(&init_user_ns, sbi->s_gid)); 343 if (sbi->s_umask != 0) 344 seq_printf(seq, ",umask=%ho", sbi->s_umask); 345 if (sbi->s_fmode != UDF_INVALID_MODE) 346 seq_printf(seq, ",mode=%ho", sbi->s_fmode); 347 if (sbi->s_dmode != UDF_INVALID_MODE) 348 seq_printf(seq, ",dmode=%ho", sbi->s_dmode); 349 if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET)) 350 seq_printf(seq, ",session=%d", sbi->s_session); 351 if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET)) 352 seq_printf(seq, ",lastblock=%u", sbi->s_last_block); 353 if (sbi->s_anchor != 0) 354 seq_printf(seq, ",anchor=%u", sbi->s_anchor); 355 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8)) 356 seq_puts(seq, ",utf8"); 357 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map) 358 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset); 359 360 return 0; 361 } 362 363 /* 364 * udf_parse_options 365 * 366 * PURPOSE 367 * Parse mount options. 368 * 369 * DESCRIPTION 370 * The following mount options are supported: 371 * 372 * gid= Set the default group. 373 * umask= Set the default umask. 374 * mode= Set the default file permissions. 375 * dmode= Set the default directory permissions. 376 * uid= Set the default user. 377 * bs= Set the block size. 378 * unhide Show otherwise hidden files. 379 * undelete Show deleted files in lists. 380 * adinicb Embed data in the inode (default) 381 * noadinicb Don't embed data in the inode 382 * shortad Use short ad's 383 * longad Use long ad's (default) 384 * nostrict Unset strict conformance 385 * iocharset= Set the NLS character set 386 * 387 * The remaining are for debugging and disaster recovery: 388 * 389 * novrs Skip volume sequence recognition 390 * 391 * The following expect a offset from 0. 392 * 393 * session= Set the CDROM session (default= last session) 394 * anchor= Override standard anchor location. (default= 256) 395 * volume= Override the VolumeDesc location. (unused) 396 * partition= Override the PartitionDesc location. (unused) 397 * lastblock= Set the last block of the filesystem/ 398 * 399 * The following expect a offset from the partition root. 400 * 401 * fileset= Override the fileset block location. (unused) 402 * rootdir= Override the root directory location. (unused) 403 * WARNING: overriding the rootdir to a non-directory may 404 * yield highly unpredictable results. 405 * 406 * PRE-CONDITIONS 407 * options Pointer to mount options string. 408 * uopts Pointer to mount options variable. 409 * 410 * POST-CONDITIONS 411 * <return> 1 Mount options parsed okay. 412 * <return> 0 Error parsing mount options. 413 * 414 * HISTORY 415 * July 1, 1997 - Andrew E. Mileski 416 * Written, tested, and released. 417 */ 418 419 enum { 420 Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete, 421 Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad, 422 Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock, 423 Opt_anchor, Opt_volume, Opt_partition, Opt_fileset, 424 Opt_rootdir, Opt_utf8, Opt_iocharset, 425 Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore, 426 Opt_fmode, Opt_dmode 427 }; 428 429 static const match_table_t tokens = { 430 {Opt_novrs, "novrs"}, 431 {Opt_nostrict, "nostrict"}, 432 {Opt_bs, "bs=%u"}, 433 {Opt_unhide, "unhide"}, 434 {Opt_undelete, "undelete"}, 435 {Opt_noadinicb, "noadinicb"}, 436 {Opt_adinicb, "adinicb"}, 437 {Opt_shortad, "shortad"}, 438 {Opt_longad, "longad"}, 439 {Opt_uforget, "uid=forget"}, 440 {Opt_uignore, "uid=ignore"}, 441 {Opt_gforget, "gid=forget"}, 442 {Opt_gignore, "gid=ignore"}, 443 {Opt_gid, "gid=%u"}, 444 {Opt_uid, "uid=%u"}, 445 {Opt_umask, "umask=%o"}, 446 {Opt_session, "session=%u"}, 447 {Opt_lastblock, "lastblock=%u"}, 448 {Opt_anchor, "anchor=%u"}, 449 {Opt_volume, "volume=%u"}, 450 {Opt_partition, "partition=%u"}, 451 {Opt_fileset, "fileset=%u"}, 452 {Opt_rootdir, "rootdir=%u"}, 453 {Opt_utf8, "utf8"}, 454 {Opt_iocharset, "iocharset=%s"}, 455 {Opt_fmode, "mode=%o"}, 456 {Opt_dmode, "dmode=%o"}, 457 {Opt_err, NULL} 458 }; 459 460 static int udf_parse_options(char *options, struct udf_options *uopt, 461 bool remount) 462 { 463 char *p; 464 int option; 465 466 uopt->novrs = 0; 467 uopt->session = 0xFFFFFFFF; 468 uopt->lastblock = 0; 469 uopt->anchor = 0; 470 471 if (!options) 472 return 1; 473 474 while ((p = strsep(&options, ",")) != NULL) { 475 substring_t args[MAX_OPT_ARGS]; 476 int token; 477 unsigned n; 478 if (!*p) 479 continue; 480 481 token = match_token(p, tokens, args); 482 switch (token) { 483 case Opt_novrs: 484 uopt->novrs = 1; 485 break; 486 case Opt_bs: 487 if (match_int(&args[0], &option)) 488 return 0; 489 n = option; 490 if (n != 512 && n != 1024 && n != 2048 && n != 4096) 491 return 0; 492 uopt->blocksize = n; 493 uopt->flags |= (1 << UDF_FLAG_BLOCKSIZE_SET); 494 break; 495 case Opt_unhide: 496 uopt->flags |= (1 << UDF_FLAG_UNHIDE); 497 break; 498 case Opt_undelete: 499 uopt->flags |= (1 << UDF_FLAG_UNDELETE); 500 break; 501 case Opt_noadinicb: 502 uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB); 503 break; 504 case Opt_adinicb: 505 uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB); 506 break; 507 case Opt_shortad: 508 uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD); 509 break; 510 case Opt_longad: 511 uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD); 512 break; 513 case Opt_gid: 514 if (match_int(args, &option)) 515 return 0; 516 uopt->gid = make_kgid(current_user_ns(), option); 517 if (!gid_valid(uopt->gid)) 518 return 0; 519 uopt->flags |= (1 << UDF_FLAG_GID_SET); 520 break; 521 case Opt_uid: 522 if (match_int(args, &option)) 523 return 0; 524 uopt->uid = make_kuid(current_user_ns(), option); 525 if (!uid_valid(uopt->uid)) 526 return 0; 527 uopt->flags |= (1 << UDF_FLAG_UID_SET); 528 break; 529 case Opt_umask: 530 if (match_octal(args, &option)) 531 return 0; 532 uopt->umask = option; 533 break; 534 case Opt_nostrict: 535 uopt->flags &= ~(1 << UDF_FLAG_STRICT); 536 break; 537 case Opt_session: 538 if (match_int(args, &option)) 539 return 0; 540 uopt->session = option; 541 if (!remount) 542 uopt->flags |= (1 << UDF_FLAG_SESSION_SET); 543 break; 544 case Opt_lastblock: 545 if (match_int(args, &option)) 546 return 0; 547 uopt->lastblock = option; 548 if (!remount) 549 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET); 550 break; 551 case Opt_anchor: 552 if (match_int(args, &option)) 553 return 0; 554 uopt->anchor = option; 555 break; 556 case Opt_volume: 557 case Opt_partition: 558 case Opt_fileset: 559 case Opt_rootdir: 560 /* Ignored (never implemented properly) */ 561 break; 562 case Opt_utf8: 563 uopt->flags |= (1 << UDF_FLAG_UTF8); 564 break; 565 case Opt_iocharset: 566 if (!remount) { 567 if (uopt->nls_map) 568 unload_nls(uopt->nls_map); 569 uopt->nls_map = load_nls(args[0].from); 570 uopt->flags |= (1 << UDF_FLAG_NLS_MAP); 571 } 572 break; 573 case Opt_uforget: 574 uopt->flags |= (1 << UDF_FLAG_UID_FORGET); 575 break; 576 case Opt_uignore: 577 case Opt_gignore: 578 /* These options are superseeded by uid=<number> */ 579 break; 580 case Opt_gforget: 581 uopt->flags |= (1 << UDF_FLAG_GID_FORGET); 582 break; 583 case Opt_fmode: 584 if (match_octal(args, &option)) 585 return 0; 586 uopt->fmode = option & 0777; 587 break; 588 case Opt_dmode: 589 if (match_octal(args, &option)) 590 return 0; 591 uopt->dmode = option & 0777; 592 break; 593 default: 594 pr_err("bad mount option \"%s\" or missing value\n", p); 595 return 0; 596 } 597 } 598 return 1; 599 } 600 601 static int udf_remount_fs(struct super_block *sb, int *flags, char *options) 602 { 603 struct udf_options uopt; 604 struct udf_sb_info *sbi = UDF_SB(sb); 605 int error = 0; 606 607 if (!(*flags & SB_RDONLY) && UDF_QUERY_FLAG(sb, UDF_FLAG_RW_INCOMPAT)) 608 return -EACCES; 609 610 sync_filesystem(sb); 611 612 uopt.flags = sbi->s_flags; 613 uopt.uid = sbi->s_uid; 614 uopt.gid = sbi->s_gid; 615 uopt.umask = sbi->s_umask; 616 uopt.fmode = sbi->s_fmode; 617 uopt.dmode = sbi->s_dmode; 618 uopt.nls_map = NULL; 619 620 if (!udf_parse_options(options, &uopt, true)) 621 return -EINVAL; 622 623 write_lock(&sbi->s_cred_lock); 624 sbi->s_flags = uopt.flags; 625 sbi->s_uid = uopt.uid; 626 sbi->s_gid = uopt.gid; 627 sbi->s_umask = uopt.umask; 628 sbi->s_fmode = uopt.fmode; 629 sbi->s_dmode = uopt.dmode; 630 write_unlock(&sbi->s_cred_lock); 631 632 if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb)) 633 goto out_unlock; 634 635 if (*flags & SB_RDONLY) 636 udf_close_lvid(sb); 637 else 638 udf_open_lvid(sb); 639 640 out_unlock: 641 return error; 642 } 643 644 /* Check Volume Structure Descriptors (ECMA 167 2/9.1) */ 645 /* We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */ 646 static loff_t udf_check_vsd(struct super_block *sb) 647 { 648 struct volStructDesc *vsd = NULL; 649 loff_t sector = VSD_FIRST_SECTOR_OFFSET; 650 int sectorsize; 651 struct buffer_head *bh = NULL; 652 int nsr02 = 0; 653 int nsr03 = 0; 654 struct udf_sb_info *sbi; 655 656 sbi = UDF_SB(sb); 657 if (sb->s_blocksize < sizeof(struct volStructDesc)) 658 sectorsize = sizeof(struct volStructDesc); 659 else 660 sectorsize = sb->s_blocksize; 661 662 sector += (((loff_t)sbi->s_session) << sb->s_blocksize_bits); 663 664 udf_debug("Starting at sector %u (%lu byte sectors)\n", 665 (unsigned int)(sector >> sb->s_blocksize_bits), 666 sb->s_blocksize); 667 /* Process the sequence (if applicable). The hard limit on the sector 668 * offset is arbitrary, hopefully large enough so that all valid UDF 669 * filesystems will be recognised. There is no mention of an upper 670 * bound to the size of the volume recognition area in the standard. 671 * The limit will prevent the code to read all the sectors of a 672 * specially crafted image (like a bluray disc full of CD001 sectors), 673 * potentially causing minutes or even hours of uninterruptible I/O 674 * activity. This actually happened with uninitialised SSD partitions 675 * (all 0xFF) before the check for the limit and all valid IDs were 676 * added */ 677 for (; !nsr02 && !nsr03 && sector < VSD_MAX_SECTOR_OFFSET; 678 sector += sectorsize) { 679 /* Read a block */ 680 bh = udf_tread(sb, sector >> sb->s_blocksize_bits); 681 if (!bh) 682 break; 683 684 /* Look for ISO descriptors */ 685 vsd = (struct volStructDesc *)(bh->b_data + 686 (sector & (sb->s_blocksize - 1))); 687 688 if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001, 689 VSD_STD_ID_LEN)) { 690 switch (vsd->structType) { 691 case 0: 692 udf_debug("ISO9660 Boot Record found\n"); 693 break; 694 case 1: 695 udf_debug("ISO9660 Primary Volume Descriptor found\n"); 696 break; 697 case 2: 698 udf_debug("ISO9660 Supplementary Volume Descriptor found\n"); 699 break; 700 case 3: 701 udf_debug("ISO9660 Volume Partition Descriptor found\n"); 702 break; 703 case 255: 704 udf_debug("ISO9660 Volume Descriptor Set Terminator found\n"); 705 break; 706 default: 707 udf_debug("ISO9660 VRS (%u) found\n", 708 vsd->structType); 709 break; 710 } 711 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01, 712 VSD_STD_ID_LEN)) 713 ; /* nothing */ 714 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01, 715 VSD_STD_ID_LEN)) { 716 brelse(bh); 717 break; 718 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02, 719 VSD_STD_ID_LEN)) 720 nsr02 = sector; 721 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03, 722 VSD_STD_ID_LEN)) 723 nsr03 = sector; 724 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BOOT2, 725 VSD_STD_ID_LEN)) 726 ; /* nothing */ 727 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CDW02, 728 VSD_STD_ID_LEN)) 729 ; /* nothing */ 730 else { 731 /* invalid id : end of volume recognition area */ 732 brelse(bh); 733 break; 734 } 735 brelse(bh); 736 } 737 738 if (nsr03) 739 return nsr03; 740 else if (nsr02) 741 return nsr02; 742 else if (!bh && sector - (sbi->s_session << sb->s_blocksize_bits) == 743 VSD_FIRST_SECTOR_OFFSET) 744 return -1; 745 else 746 return 0; 747 } 748 749 static int udf_find_fileset(struct super_block *sb, 750 struct kernel_lb_addr *fileset, 751 struct kernel_lb_addr *root) 752 { 753 struct buffer_head *bh = NULL; 754 uint16_t ident; 755 756 if (fileset->logicalBlockNum != 0xFFFFFFFF || 757 fileset->partitionReferenceNum != 0xFFFF) { 758 bh = udf_read_ptagged(sb, fileset, 0, &ident); 759 760 if (!bh) { 761 return 1; 762 } else if (ident != TAG_IDENT_FSD) { 763 brelse(bh); 764 return 1; 765 } 766 767 udf_debug("Fileset at block=%u, partition=%u\n", 768 fileset->logicalBlockNum, 769 fileset->partitionReferenceNum); 770 771 UDF_SB(sb)->s_partition = fileset->partitionReferenceNum; 772 udf_load_fileset(sb, bh, root); 773 brelse(bh); 774 return 0; 775 } 776 return 1; 777 } 778 779 /* 780 * Load primary Volume Descriptor Sequence 781 * 782 * Return <0 on error, 0 on success. -EAGAIN is special meaning next sequence 783 * should be tried. 784 */ 785 static int udf_load_pvoldesc(struct super_block *sb, sector_t block) 786 { 787 struct primaryVolDesc *pvoldesc; 788 uint8_t *outstr; 789 struct buffer_head *bh; 790 uint16_t ident; 791 int ret = -ENOMEM; 792 #ifdef UDFFS_DEBUG 793 struct timestamp *ts; 794 #endif 795 796 outstr = kmalloc(128, GFP_NOFS); 797 if (!outstr) 798 return -ENOMEM; 799 800 bh = udf_read_tagged(sb, block, block, &ident); 801 if (!bh) { 802 ret = -EAGAIN; 803 goto out2; 804 } 805 806 if (ident != TAG_IDENT_PVD) { 807 ret = -EIO; 808 goto out_bh; 809 } 810 811 pvoldesc = (struct primaryVolDesc *)bh->b_data; 812 813 udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time, 814 pvoldesc->recordingDateAndTime); 815 #ifdef UDFFS_DEBUG 816 ts = &pvoldesc->recordingDateAndTime; 817 udf_debug("recording time %04u/%02u/%02u %02u:%02u (%x)\n", 818 le16_to_cpu(ts->year), ts->month, ts->day, ts->hour, 819 ts->minute, le16_to_cpu(ts->typeAndTimezone)); 820 #endif 821 822 823 ret = udf_dstrCS0toChar(sb, outstr, 31, pvoldesc->volIdent, 32); 824 if (ret < 0) { 825 strcpy(UDF_SB(sb)->s_volume_ident, "InvalidName"); 826 pr_warn("incorrect volume identification, setting to " 827 "'InvalidName'\n"); 828 } else { 829 strncpy(UDF_SB(sb)->s_volume_ident, outstr, ret); 830 } 831 udf_debug("volIdent[] = '%s'\n", UDF_SB(sb)->s_volume_ident); 832 833 ret = udf_dstrCS0toChar(sb, outstr, 127, pvoldesc->volSetIdent, 128); 834 if (ret < 0) { 835 ret = 0; 836 goto out_bh; 837 } 838 outstr[ret] = 0; 839 udf_debug("volSetIdent[] = '%s'\n", outstr); 840 841 ret = 0; 842 out_bh: 843 brelse(bh); 844 out2: 845 kfree(outstr); 846 return ret; 847 } 848 849 struct inode *udf_find_metadata_inode_efe(struct super_block *sb, 850 u32 meta_file_loc, u32 partition_ref) 851 { 852 struct kernel_lb_addr addr; 853 struct inode *metadata_fe; 854 855 addr.logicalBlockNum = meta_file_loc; 856 addr.partitionReferenceNum = partition_ref; 857 858 metadata_fe = udf_iget_special(sb, &addr); 859 860 if (IS_ERR(metadata_fe)) { 861 udf_warn(sb, "metadata inode efe not found\n"); 862 return metadata_fe; 863 } 864 if (UDF_I(metadata_fe)->i_alloc_type != ICBTAG_FLAG_AD_SHORT) { 865 udf_warn(sb, "metadata inode efe does not have short allocation descriptors!\n"); 866 iput(metadata_fe); 867 return ERR_PTR(-EIO); 868 } 869 870 return metadata_fe; 871 } 872 873 static int udf_load_metadata_files(struct super_block *sb, int partition, 874 int type1_index) 875 { 876 struct udf_sb_info *sbi = UDF_SB(sb); 877 struct udf_part_map *map; 878 struct udf_meta_data *mdata; 879 struct kernel_lb_addr addr; 880 struct inode *fe; 881 882 map = &sbi->s_partmaps[partition]; 883 mdata = &map->s_type_specific.s_metadata; 884 mdata->s_phys_partition_ref = type1_index; 885 886 /* metadata address */ 887 udf_debug("Metadata file location: block = %u part = %u\n", 888 mdata->s_meta_file_loc, mdata->s_phys_partition_ref); 889 890 fe = udf_find_metadata_inode_efe(sb, mdata->s_meta_file_loc, 891 mdata->s_phys_partition_ref); 892 if (IS_ERR(fe)) { 893 /* mirror file entry */ 894 udf_debug("Mirror metadata file location: block = %u part = %u\n", 895 mdata->s_mirror_file_loc, mdata->s_phys_partition_ref); 896 897 fe = udf_find_metadata_inode_efe(sb, mdata->s_mirror_file_loc, 898 mdata->s_phys_partition_ref); 899 900 if (IS_ERR(fe)) { 901 udf_err(sb, "Both metadata and mirror metadata inode efe can not found\n"); 902 return PTR_ERR(fe); 903 } 904 mdata->s_mirror_fe = fe; 905 } else 906 mdata->s_metadata_fe = fe; 907 908 909 /* 910 * bitmap file entry 911 * Note: 912 * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102) 913 */ 914 if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) { 915 addr.logicalBlockNum = mdata->s_bitmap_file_loc; 916 addr.partitionReferenceNum = mdata->s_phys_partition_ref; 917 918 udf_debug("Bitmap file location: block = %u part = %u\n", 919 addr.logicalBlockNum, addr.partitionReferenceNum); 920 921 fe = udf_iget_special(sb, &addr); 922 if (IS_ERR(fe)) { 923 if (sb_rdonly(sb)) 924 udf_warn(sb, "bitmap inode efe not found but it's ok since the disc is mounted read-only\n"); 925 else { 926 udf_err(sb, "bitmap inode efe not found and attempted read-write mount\n"); 927 return PTR_ERR(fe); 928 } 929 } else 930 mdata->s_bitmap_fe = fe; 931 } 932 933 udf_debug("udf_load_metadata_files Ok\n"); 934 return 0; 935 } 936 937 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh, 938 struct kernel_lb_addr *root) 939 { 940 struct fileSetDesc *fset; 941 942 fset = (struct fileSetDesc *)bh->b_data; 943 944 *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation); 945 946 UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum); 947 948 udf_debug("Rootdir at block=%u, partition=%u\n", 949 root->logicalBlockNum, root->partitionReferenceNum); 950 } 951 952 int udf_compute_nr_groups(struct super_block *sb, u32 partition) 953 { 954 struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition]; 955 return DIV_ROUND_UP(map->s_partition_len + 956 (sizeof(struct spaceBitmapDesc) << 3), 957 sb->s_blocksize * 8); 958 } 959 960 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index) 961 { 962 struct udf_bitmap *bitmap; 963 int nr_groups; 964 int size; 965 966 nr_groups = udf_compute_nr_groups(sb, index); 967 size = sizeof(struct udf_bitmap) + 968 (sizeof(struct buffer_head *) * nr_groups); 969 970 if (size <= PAGE_SIZE) 971 bitmap = kzalloc(size, GFP_KERNEL); 972 else 973 bitmap = vzalloc(size); /* TODO: get rid of vzalloc */ 974 975 if (!bitmap) 976 return NULL; 977 978 bitmap->s_nr_groups = nr_groups; 979 return bitmap; 980 } 981 982 static int check_partition_desc(struct super_block *sb, 983 struct partitionDesc *p, 984 struct udf_part_map *map) 985 { 986 bool umap, utable, fmap, ftable; 987 struct partitionHeaderDesc *phd; 988 989 switch (le32_to_cpu(p->accessType)) { 990 case PD_ACCESS_TYPE_READ_ONLY: 991 case PD_ACCESS_TYPE_WRITE_ONCE: 992 case PD_ACCESS_TYPE_REWRITABLE: 993 case PD_ACCESS_TYPE_NONE: 994 goto force_ro; 995 } 996 997 /* No Partition Header Descriptor? */ 998 if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) && 999 strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03)) 1000 goto force_ro; 1001 1002 phd = (struct partitionHeaderDesc *)p->partitionContentsUse; 1003 utable = phd->unallocSpaceTable.extLength; 1004 umap = phd->unallocSpaceBitmap.extLength; 1005 ftable = phd->freedSpaceTable.extLength; 1006 fmap = phd->freedSpaceBitmap.extLength; 1007 1008 /* No allocation info? */ 1009 if (!utable && !umap && !ftable && !fmap) 1010 goto force_ro; 1011 1012 /* We don't support blocks that require erasing before overwrite */ 1013 if (ftable || fmap) 1014 goto force_ro; 1015 /* UDF 2.60: 2.3.3 - no mixing of tables & bitmaps, no VAT. */ 1016 if (utable && umap) 1017 goto force_ro; 1018 1019 if (map->s_partition_type == UDF_VIRTUAL_MAP15 || 1020 map->s_partition_type == UDF_VIRTUAL_MAP20) 1021 goto force_ro; 1022 1023 return 0; 1024 force_ro: 1025 if (!sb_rdonly(sb)) 1026 return -EACCES; 1027 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT); 1028 return 0; 1029 } 1030 1031 static int udf_fill_partdesc_info(struct super_block *sb, 1032 struct partitionDesc *p, int p_index) 1033 { 1034 struct udf_part_map *map; 1035 struct udf_sb_info *sbi = UDF_SB(sb); 1036 struct partitionHeaderDesc *phd; 1037 int err; 1038 1039 map = &sbi->s_partmaps[p_index]; 1040 1041 map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */ 1042 map->s_partition_root = le32_to_cpu(p->partitionStartingLocation); 1043 1044 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY)) 1045 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY; 1046 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE)) 1047 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE; 1048 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE)) 1049 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE; 1050 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE)) 1051 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE; 1052 1053 udf_debug("Partition (%d type %x) starts at physical %u, block length %u\n", 1054 p_index, map->s_partition_type, 1055 map->s_partition_root, map->s_partition_len); 1056 1057 err = check_partition_desc(sb, p, map); 1058 if (err) 1059 return err; 1060 1061 /* 1062 * Skip loading allocation info it we cannot ever write to the fs. 1063 * This is a correctness thing as we may have decided to force ro mount 1064 * to avoid allocation info we don't support. 1065 */ 1066 if (UDF_QUERY_FLAG(sb, UDF_FLAG_RW_INCOMPAT)) 1067 return 0; 1068 1069 phd = (struct partitionHeaderDesc *)p->partitionContentsUse; 1070 if (phd->unallocSpaceTable.extLength) { 1071 struct kernel_lb_addr loc = { 1072 .logicalBlockNum = le32_to_cpu( 1073 phd->unallocSpaceTable.extPosition), 1074 .partitionReferenceNum = p_index, 1075 }; 1076 struct inode *inode; 1077 1078 inode = udf_iget_special(sb, &loc); 1079 if (IS_ERR(inode)) { 1080 udf_debug("cannot load unallocSpaceTable (part %d)\n", 1081 p_index); 1082 return PTR_ERR(inode); 1083 } 1084 map->s_uspace.s_table = inode; 1085 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE; 1086 udf_debug("unallocSpaceTable (part %d) @ %lu\n", 1087 p_index, map->s_uspace.s_table->i_ino); 1088 } 1089 1090 if (phd->unallocSpaceBitmap.extLength) { 1091 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index); 1092 if (!bitmap) 1093 return -ENOMEM; 1094 map->s_uspace.s_bitmap = bitmap; 1095 bitmap->s_extPosition = le32_to_cpu( 1096 phd->unallocSpaceBitmap.extPosition); 1097 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP; 1098 udf_debug("unallocSpaceBitmap (part %d) @ %u\n", 1099 p_index, bitmap->s_extPosition); 1100 } 1101 1102 return 0; 1103 } 1104 1105 static void udf_find_vat_block(struct super_block *sb, int p_index, 1106 int type1_index, sector_t start_block) 1107 { 1108 struct udf_sb_info *sbi = UDF_SB(sb); 1109 struct udf_part_map *map = &sbi->s_partmaps[p_index]; 1110 sector_t vat_block; 1111 struct kernel_lb_addr ino; 1112 struct inode *inode; 1113 1114 /* 1115 * VAT file entry is in the last recorded block. Some broken disks have 1116 * it a few blocks before so try a bit harder... 1117 */ 1118 ino.partitionReferenceNum = type1_index; 1119 for (vat_block = start_block; 1120 vat_block >= map->s_partition_root && 1121 vat_block >= start_block - 3; vat_block--) { 1122 ino.logicalBlockNum = vat_block - map->s_partition_root; 1123 inode = udf_iget_special(sb, &ino); 1124 if (!IS_ERR(inode)) { 1125 sbi->s_vat_inode = inode; 1126 break; 1127 } 1128 } 1129 } 1130 1131 static int udf_load_vat(struct super_block *sb, int p_index, int type1_index) 1132 { 1133 struct udf_sb_info *sbi = UDF_SB(sb); 1134 struct udf_part_map *map = &sbi->s_partmaps[p_index]; 1135 struct buffer_head *bh = NULL; 1136 struct udf_inode_info *vati; 1137 uint32_t pos; 1138 struct virtualAllocationTable20 *vat20; 1139 sector_t blocks = i_size_read(sb->s_bdev->bd_inode) >> 1140 sb->s_blocksize_bits; 1141 1142 udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block); 1143 if (!sbi->s_vat_inode && 1144 sbi->s_last_block != blocks - 1) { 1145 pr_notice("Failed to read VAT inode from the last recorded block (%lu), retrying with the last block of the device (%lu).\n", 1146 (unsigned long)sbi->s_last_block, 1147 (unsigned long)blocks - 1); 1148 udf_find_vat_block(sb, p_index, type1_index, blocks - 1); 1149 } 1150 if (!sbi->s_vat_inode) 1151 return -EIO; 1152 1153 if (map->s_partition_type == UDF_VIRTUAL_MAP15) { 1154 map->s_type_specific.s_virtual.s_start_offset = 0; 1155 map->s_type_specific.s_virtual.s_num_entries = 1156 (sbi->s_vat_inode->i_size - 36) >> 2; 1157 } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) { 1158 vati = UDF_I(sbi->s_vat_inode); 1159 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { 1160 pos = udf_block_map(sbi->s_vat_inode, 0); 1161 bh = sb_bread(sb, pos); 1162 if (!bh) 1163 return -EIO; 1164 vat20 = (struct virtualAllocationTable20 *)bh->b_data; 1165 } else { 1166 vat20 = (struct virtualAllocationTable20 *) 1167 vati->i_ext.i_data; 1168 } 1169 1170 map->s_type_specific.s_virtual.s_start_offset = 1171 le16_to_cpu(vat20->lengthHeader); 1172 map->s_type_specific.s_virtual.s_num_entries = 1173 (sbi->s_vat_inode->i_size - 1174 map->s_type_specific.s_virtual. 1175 s_start_offset) >> 2; 1176 brelse(bh); 1177 } 1178 return 0; 1179 } 1180 1181 /* 1182 * Load partition descriptor block 1183 * 1184 * Returns <0 on error, 0 on success, -EAGAIN is special - try next descriptor 1185 * sequence. 1186 */ 1187 static int udf_load_partdesc(struct super_block *sb, sector_t block) 1188 { 1189 struct buffer_head *bh; 1190 struct partitionDesc *p; 1191 struct udf_part_map *map; 1192 struct udf_sb_info *sbi = UDF_SB(sb); 1193 int i, type1_idx; 1194 uint16_t partitionNumber; 1195 uint16_t ident; 1196 int ret; 1197 1198 bh = udf_read_tagged(sb, block, block, &ident); 1199 if (!bh) 1200 return -EAGAIN; 1201 if (ident != TAG_IDENT_PD) { 1202 ret = 0; 1203 goto out_bh; 1204 } 1205 1206 p = (struct partitionDesc *)bh->b_data; 1207 partitionNumber = le16_to_cpu(p->partitionNumber); 1208 1209 /* First scan for TYPE1 and SPARABLE partitions */ 1210 for (i = 0; i < sbi->s_partitions; i++) { 1211 map = &sbi->s_partmaps[i]; 1212 udf_debug("Searching map: (%u == %u)\n", 1213 map->s_partition_num, partitionNumber); 1214 if (map->s_partition_num == partitionNumber && 1215 (map->s_partition_type == UDF_TYPE1_MAP15 || 1216 map->s_partition_type == UDF_SPARABLE_MAP15)) 1217 break; 1218 } 1219 1220 if (i >= sbi->s_partitions) { 1221 udf_debug("Partition (%u) not found in partition map\n", 1222 partitionNumber); 1223 ret = 0; 1224 goto out_bh; 1225 } 1226 1227 ret = udf_fill_partdesc_info(sb, p, i); 1228 if (ret < 0) 1229 goto out_bh; 1230 1231 /* 1232 * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and 1233 * PHYSICAL partitions are already set up 1234 */ 1235 type1_idx = i; 1236 #ifdef UDFFS_DEBUG 1237 map = NULL; /* supress 'maybe used uninitialized' warning */ 1238 #endif 1239 for (i = 0; i < sbi->s_partitions; i++) { 1240 map = &sbi->s_partmaps[i]; 1241 1242 if (map->s_partition_num == partitionNumber && 1243 (map->s_partition_type == UDF_VIRTUAL_MAP15 || 1244 map->s_partition_type == UDF_VIRTUAL_MAP20 || 1245 map->s_partition_type == UDF_METADATA_MAP25)) 1246 break; 1247 } 1248 1249 if (i >= sbi->s_partitions) { 1250 ret = 0; 1251 goto out_bh; 1252 } 1253 1254 ret = udf_fill_partdesc_info(sb, p, i); 1255 if (ret < 0) 1256 goto out_bh; 1257 1258 if (map->s_partition_type == UDF_METADATA_MAP25) { 1259 ret = udf_load_metadata_files(sb, i, type1_idx); 1260 if (ret < 0) { 1261 udf_err(sb, "error loading MetaData partition map %d\n", 1262 i); 1263 goto out_bh; 1264 } 1265 } else { 1266 /* 1267 * If we have a partition with virtual map, we don't handle 1268 * writing to it (we overwrite blocks instead of relocating 1269 * them). 1270 */ 1271 if (!sb_rdonly(sb)) { 1272 ret = -EACCES; 1273 goto out_bh; 1274 } 1275 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT); 1276 ret = udf_load_vat(sb, i, type1_idx); 1277 if (ret < 0) 1278 goto out_bh; 1279 } 1280 ret = 0; 1281 out_bh: 1282 /* In case loading failed, we handle cleanup in udf_fill_super */ 1283 brelse(bh); 1284 return ret; 1285 } 1286 1287 static int udf_load_sparable_map(struct super_block *sb, 1288 struct udf_part_map *map, 1289 struct sparablePartitionMap *spm) 1290 { 1291 uint32_t loc; 1292 uint16_t ident; 1293 struct sparingTable *st; 1294 struct udf_sparing_data *sdata = &map->s_type_specific.s_sparing; 1295 int i; 1296 struct buffer_head *bh; 1297 1298 map->s_partition_type = UDF_SPARABLE_MAP15; 1299 sdata->s_packet_len = le16_to_cpu(spm->packetLength); 1300 if (!is_power_of_2(sdata->s_packet_len)) { 1301 udf_err(sb, "error loading logical volume descriptor: " 1302 "Invalid packet length %u\n", 1303 (unsigned)sdata->s_packet_len); 1304 return -EIO; 1305 } 1306 if (spm->numSparingTables > 4) { 1307 udf_err(sb, "error loading logical volume descriptor: " 1308 "Too many sparing tables (%d)\n", 1309 (int)spm->numSparingTables); 1310 return -EIO; 1311 } 1312 1313 for (i = 0; i < spm->numSparingTables; i++) { 1314 loc = le32_to_cpu(spm->locSparingTable[i]); 1315 bh = udf_read_tagged(sb, loc, loc, &ident); 1316 if (!bh) 1317 continue; 1318 1319 st = (struct sparingTable *)bh->b_data; 1320 if (ident != 0 || 1321 strncmp(st->sparingIdent.ident, UDF_ID_SPARING, 1322 strlen(UDF_ID_SPARING)) || 1323 sizeof(*st) + le16_to_cpu(st->reallocationTableLen) > 1324 sb->s_blocksize) { 1325 brelse(bh); 1326 continue; 1327 } 1328 1329 sdata->s_spar_map[i] = bh; 1330 } 1331 map->s_partition_func = udf_get_pblock_spar15; 1332 return 0; 1333 } 1334 1335 static int udf_load_logicalvol(struct super_block *sb, sector_t block, 1336 struct kernel_lb_addr *fileset) 1337 { 1338 struct logicalVolDesc *lvd; 1339 int i, offset; 1340 uint8_t type; 1341 struct udf_sb_info *sbi = UDF_SB(sb); 1342 struct genericPartitionMap *gpm; 1343 uint16_t ident; 1344 struct buffer_head *bh; 1345 unsigned int table_len; 1346 int ret; 1347 1348 bh = udf_read_tagged(sb, block, block, &ident); 1349 if (!bh) 1350 return -EAGAIN; 1351 BUG_ON(ident != TAG_IDENT_LVD); 1352 lvd = (struct logicalVolDesc *)bh->b_data; 1353 table_len = le32_to_cpu(lvd->mapTableLength); 1354 if (table_len > sb->s_blocksize - sizeof(*lvd)) { 1355 udf_err(sb, "error loading logical volume descriptor: " 1356 "Partition table too long (%u > %lu)\n", table_len, 1357 sb->s_blocksize - sizeof(*lvd)); 1358 ret = -EIO; 1359 goto out_bh; 1360 } 1361 1362 ret = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps)); 1363 if (ret) 1364 goto out_bh; 1365 1366 for (i = 0, offset = 0; 1367 i < sbi->s_partitions && offset < table_len; 1368 i++, offset += gpm->partitionMapLength) { 1369 struct udf_part_map *map = &sbi->s_partmaps[i]; 1370 gpm = (struct genericPartitionMap *) 1371 &(lvd->partitionMaps[offset]); 1372 type = gpm->partitionMapType; 1373 if (type == 1) { 1374 struct genericPartitionMap1 *gpm1 = 1375 (struct genericPartitionMap1 *)gpm; 1376 map->s_partition_type = UDF_TYPE1_MAP15; 1377 map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum); 1378 map->s_partition_num = le16_to_cpu(gpm1->partitionNum); 1379 map->s_partition_func = NULL; 1380 } else if (type == 2) { 1381 struct udfPartitionMap2 *upm2 = 1382 (struct udfPartitionMap2 *)gpm; 1383 if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL, 1384 strlen(UDF_ID_VIRTUAL))) { 1385 u16 suf = 1386 le16_to_cpu(((__le16 *)upm2->partIdent. 1387 identSuffix)[0]); 1388 if (suf < 0x0200) { 1389 map->s_partition_type = 1390 UDF_VIRTUAL_MAP15; 1391 map->s_partition_func = 1392 udf_get_pblock_virt15; 1393 } else { 1394 map->s_partition_type = 1395 UDF_VIRTUAL_MAP20; 1396 map->s_partition_func = 1397 udf_get_pblock_virt20; 1398 } 1399 } else if (!strncmp(upm2->partIdent.ident, 1400 UDF_ID_SPARABLE, 1401 strlen(UDF_ID_SPARABLE))) { 1402 ret = udf_load_sparable_map(sb, map, 1403 (struct sparablePartitionMap *)gpm); 1404 if (ret < 0) 1405 goto out_bh; 1406 } else if (!strncmp(upm2->partIdent.ident, 1407 UDF_ID_METADATA, 1408 strlen(UDF_ID_METADATA))) { 1409 struct udf_meta_data *mdata = 1410 &map->s_type_specific.s_metadata; 1411 struct metadataPartitionMap *mdm = 1412 (struct metadataPartitionMap *) 1413 &(lvd->partitionMaps[offset]); 1414 udf_debug("Parsing Logical vol part %d type %u id=%s\n", 1415 i, type, UDF_ID_METADATA); 1416 1417 map->s_partition_type = UDF_METADATA_MAP25; 1418 map->s_partition_func = udf_get_pblock_meta25; 1419 1420 mdata->s_meta_file_loc = 1421 le32_to_cpu(mdm->metadataFileLoc); 1422 mdata->s_mirror_file_loc = 1423 le32_to_cpu(mdm->metadataMirrorFileLoc); 1424 mdata->s_bitmap_file_loc = 1425 le32_to_cpu(mdm->metadataBitmapFileLoc); 1426 mdata->s_alloc_unit_size = 1427 le32_to_cpu(mdm->allocUnitSize); 1428 mdata->s_align_unit_size = 1429 le16_to_cpu(mdm->alignUnitSize); 1430 if (mdm->flags & 0x01) 1431 mdata->s_flags |= MF_DUPLICATE_MD; 1432 1433 udf_debug("Metadata Ident suffix=0x%x\n", 1434 le16_to_cpu(*(__le16 *) 1435 mdm->partIdent.identSuffix)); 1436 udf_debug("Metadata part num=%u\n", 1437 le16_to_cpu(mdm->partitionNum)); 1438 udf_debug("Metadata part alloc unit size=%u\n", 1439 le32_to_cpu(mdm->allocUnitSize)); 1440 udf_debug("Metadata file loc=%u\n", 1441 le32_to_cpu(mdm->metadataFileLoc)); 1442 udf_debug("Mirror file loc=%u\n", 1443 le32_to_cpu(mdm->metadataMirrorFileLoc)); 1444 udf_debug("Bitmap file loc=%u\n", 1445 le32_to_cpu(mdm->metadataBitmapFileLoc)); 1446 udf_debug("Flags: %d %u\n", 1447 mdata->s_flags, mdm->flags); 1448 } else { 1449 udf_debug("Unknown ident: %s\n", 1450 upm2->partIdent.ident); 1451 continue; 1452 } 1453 map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum); 1454 map->s_partition_num = le16_to_cpu(upm2->partitionNum); 1455 } 1456 udf_debug("Partition (%d:%u) type %u on volume %u\n", 1457 i, map->s_partition_num, type, map->s_volumeseqnum); 1458 } 1459 1460 if (fileset) { 1461 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]); 1462 1463 *fileset = lelb_to_cpu(la->extLocation); 1464 udf_debug("FileSet found in LogicalVolDesc at block=%u, partition=%u\n", 1465 fileset->logicalBlockNum, 1466 fileset->partitionReferenceNum); 1467 } 1468 if (lvd->integritySeqExt.extLength) 1469 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt)); 1470 ret = 0; 1471 1472 if (!sbi->s_lvid_bh) { 1473 /* We can't generate unique IDs without a valid LVID */ 1474 if (sb_rdonly(sb)) { 1475 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT); 1476 } else { 1477 udf_warn(sb, "Damaged or missing LVID, forcing " 1478 "readonly mount\n"); 1479 ret = -EACCES; 1480 } 1481 } 1482 out_bh: 1483 brelse(bh); 1484 return ret; 1485 } 1486 1487 /* 1488 * Find the prevailing Logical Volume Integrity Descriptor. 1489 */ 1490 static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc) 1491 { 1492 struct buffer_head *bh, *final_bh; 1493 uint16_t ident; 1494 struct udf_sb_info *sbi = UDF_SB(sb); 1495 struct logicalVolIntegrityDesc *lvid; 1496 int indirections = 0; 1497 1498 while (++indirections <= UDF_MAX_LVID_NESTING) { 1499 final_bh = NULL; 1500 while (loc.extLength > 0 && 1501 (bh = udf_read_tagged(sb, loc.extLocation, 1502 loc.extLocation, &ident))) { 1503 if (ident != TAG_IDENT_LVID) { 1504 brelse(bh); 1505 break; 1506 } 1507 1508 brelse(final_bh); 1509 final_bh = bh; 1510 1511 loc.extLength -= sb->s_blocksize; 1512 loc.extLocation++; 1513 } 1514 1515 if (!final_bh) 1516 return; 1517 1518 brelse(sbi->s_lvid_bh); 1519 sbi->s_lvid_bh = final_bh; 1520 1521 lvid = (struct logicalVolIntegrityDesc *)final_bh->b_data; 1522 if (lvid->nextIntegrityExt.extLength == 0) 1523 return; 1524 1525 loc = leea_to_cpu(lvid->nextIntegrityExt); 1526 } 1527 1528 udf_warn(sb, "Too many LVID indirections (max %u), ignoring.\n", 1529 UDF_MAX_LVID_NESTING); 1530 brelse(sbi->s_lvid_bh); 1531 sbi->s_lvid_bh = NULL; 1532 } 1533 1534 /* 1535 * Step for reallocation of table of partition descriptor sequence numbers. 1536 * Must be power of 2. 1537 */ 1538 #define PART_DESC_ALLOC_STEP 32 1539 1540 struct part_desc_seq_scan_data { 1541 struct udf_vds_record rec; 1542 u32 partnum; 1543 }; 1544 1545 struct desc_seq_scan_data { 1546 struct udf_vds_record vds[VDS_POS_LENGTH]; 1547 unsigned int size_part_descs; 1548 unsigned int num_part_descs; 1549 struct part_desc_seq_scan_data *part_descs_loc; 1550 }; 1551 1552 static struct udf_vds_record *handle_partition_descriptor( 1553 struct buffer_head *bh, 1554 struct desc_seq_scan_data *data) 1555 { 1556 struct partitionDesc *desc = (struct partitionDesc *)bh->b_data; 1557 int partnum; 1558 int i; 1559 1560 partnum = le16_to_cpu(desc->partitionNumber); 1561 for (i = 0; i < data->num_part_descs; i++) 1562 if (partnum == data->part_descs_loc[i].partnum) 1563 return &(data->part_descs_loc[i].rec); 1564 if (data->num_part_descs >= data->size_part_descs) { 1565 struct part_desc_seq_scan_data *new_loc; 1566 unsigned int new_size = ALIGN(partnum, PART_DESC_ALLOC_STEP); 1567 1568 new_loc = kcalloc(new_size, sizeof(*new_loc), GFP_KERNEL); 1569 if (!new_loc) 1570 return ERR_PTR(-ENOMEM); 1571 memcpy(new_loc, data->part_descs_loc, 1572 data->size_part_descs * sizeof(*new_loc)); 1573 kfree(data->part_descs_loc); 1574 data->part_descs_loc = new_loc; 1575 data->size_part_descs = new_size; 1576 } 1577 return &(data->part_descs_loc[data->num_part_descs++].rec); 1578 } 1579 1580 1581 static struct udf_vds_record *get_volume_descriptor_record(uint16_t ident, 1582 struct buffer_head *bh, struct desc_seq_scan_data *data) 1583 { 1584 switch (ident) { 1585 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */ 1586 return &(data->vds[VDS_POS_PRIMARY_VOL_DESC]); 1587 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */ 1588 return &(data->vds[VDS_POS_IMP_USE_VOL_DESC]); 1589 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */ 1590 return &(data->vds[VDS_POS_LOGICAL_VOL_DESC]); 1591 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */ 1592 return &(data->vds[VDS_POS_UNALLOC_SPACE_DESC]); 1593 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */ 1594 return handle_partition_descriptor(bh, data); 1595 } 1596 return NULL; 1597 } 1598 1599 /* 1600 * Process a main/reserve volume descriptor sequence. 1601 * @block First block of first extent of the sequence. 1602 * @lastblock Lastblock of first extent of the sequence. 1603 * @fileset There we store extent containing root fileset 1604 * 1605 * Returns <0 on error, 0 on success. -EAGAIN is special - try next descriptor 1606 * sequence 1607 */ 1608 static noinline int udf_process_sequence( 1609 struct super_block *sb, 1610 sector_t block, sector_t lastblock, 1611 struct kernel_lb_addr *fileset) 1612 { 1613 struct buffer_head *bh = NULL; 1614 struct udf_vds_record *curr; 1615 struct generic_desc *gd; 1616 struct volDescPtr *vdp; 1617 bool done = false; 1618 uint32_t vdsn; 1619 uint16_t ident; 1620 int ret; 1621 unsigned int indirections = 0; 1622 struct desc_seq_scan_data data; 1623 unsigned int i; 1624 1625 memset(data.vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH); 1626 data.size_part_descs = PART_DESC_ALLOC_STEP; 1627 data.num_part_descs = 0; 1628 data.part_descs_loc = kcalloc(data.size_part_descs, 1629 sizeof(*data.part_descs_loc), 1630 GFP_KERNEL); 1631 if (!data.part_descs_loc) 1632 return -ENOMEM; 1633 1634 /* 1635 * Read the main descriptor sequence and find which descriptors 1636 * are in it. 1637 */ 1638 for (; (!done && block <= lastblock); block++) { 1639 bh = udf_read_tagged(sb, block, block, &ident); 1640 if (!bh) 1641 break; 1642 1643 /* Process each descriptor (ISO 13346 3/8.3-8.4) */ 1644 gd = (struct generic_desc *)bh->b_data; 1645 vdsn = le32_to_cpu(gd->volDescSeqNum); 1646 switch (ident) { 1647 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */ 1648 if (++indirections > UDF_MAX_TD_NESTING) { 1649 udf_err(sb, "too many Volume Descriptor " 1650 "Pointers (max %u supported)\n", 1651 UDF_MAX_TD_NESTING); 1652 brelse(bh); 1653 return -EIO; 1654 } 1655 1656 vdp = (struct volDescPtr *)bh->b_data; 1657 block = le32_to_cpu(vdp->nextVolDescSeqExt.extLocation); 1658 lastblock = le32_to_cpu( 1659 vdp->nextVolDescSeqExt.extLength) >> 1660 sb->s_blocksize_bits; 1661 lastblock += block - 1; 1662 /* For loop is going to increment 'block' again */ 1663 block--; 1664 break; 1665 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */ 1666 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */ 1667 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */ 1668 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */ 1669 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */ 1670 curr = get_volume_descriptor_record(ident, bh, &data); 1671 if (IS_ERR(curr)) { 1672 brelse(bh); 1673 return PTR_ERR(curr); 1674 } 1675 /* Descriptor we don't care about? */ 1676 if (!curr) 1677 break; 1678 if (vdsn >= curr->volDescSeqNum) { 1679 curr->volDescSeqNum = vdsn; 1680 curr->block = block; 1681 } 1682 break; 1683 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */ 1684 done = true; 1685 break; 1686 } 1687 brelse(bh); 1688 } 1689 /* 1690 * Now read interesting descriptors again and process them 1691 * in a suitable order 1692 */ 1693 if (!data.vds[VDS_POS_PRIMARY_VOL_DESC].block) { 1694 udf_err(sb, "Primary Volume Descriptor not found!\n"); 1695 return -EAGAIN; 1696 } 1697 ret = udf_load_pvoldesc(sb, data.vds[VDS_POS_PRIMARY_VOL_DESC].block); 1698 if (ret < 0) 1699 return ret; 1700 1701 if (data.vds[VDS_POS_LOGICAL_VOL_DESC].block) { 1702 ret = udf_load_logicalvol(sb, 1703 data.vds[VDS_POS_LOGICAL_VOL_DESC].block, 1704 fileset); 1705 if (ret < 0) 1706 return ret; 1707 } 1708 1709 /* Now handle prevailing Partition Descriptors */ 1710 for (i = 0; i < data.num_part_descs; i++) { 1711 ret = udf_load_partdesc(sb, data.part_descs_loc[i].rec.block); 1712 if (ret < 0) 1713 return ret; 1714 } 1715 1716 return 0; 1717 } 1718 1719 /* 1720 * Load Volume Descriptor Sequence described by anchor in bh 1721 * 1722 * Returns <0 on error, 0 on success 1723 */ 1724 static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh, 1725 struct kernel_lb_addr *fileset) 1726 { 1727 struct anchorVolDescPtr *anchor; 1728 sector_t main_s, main_e, reserve_s, reserve_e; 1729 int ret; 1730 1731 anchor = (struct anchorVolDescPtr *)bh->b_data; 1732 1733 /* Locate the main sequence */ 1734 main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation); 1735 main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength); 1736 main_e = main_e >> sb->s_blocksize_bits; 1737 main_e += main_s - 1; 1738 1739 /* Locate the reserve sequence */ 1740 reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation); 1741 reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength); 1742 reserve_e = reserve_e >> sb->s_blocksize_bits; 1743 reserve_e += reserve_s - 1; 1744 1745 /* Process the main & reserve sequences */ 1746 /* responsible for finding the PartitionDesc(s) */ 1747 ret = udf_process_sequence(sb, main_s, main_e, fileset); 1748 if (ret != -EAGAIN) 1749 return ret; 1750 udf_sb_free_partitions(sb); 1751 ret = udf_process_sequence(sb, reserve_s, reserve_e, fileset); 1752 if (ret < 0) { 1753 udf_sb_free_partitions(sb); 1754 /* No sequence was OK, return -EIO */ 1755 if (ret == -EAGAIN) 1756 ret = -EIO; 1757 } 1758 return ret; 1759 } 1760 1761 /* 1762 * Check whether there is an anchor block in the given block and 1763 * load Volume Descriptor Sequence if so. 1764 * 1765 * Returns <0 on error, 0 on success, -EAGAIN is special - try next anchor 1766 * block 1767 */ 1768 static int udf_check_anchor_block(struct super_block *sb, sector_t block, 1769 struct kernel_lb_addr *fileset) 1770 { 1771 struct buffer_head *bh; 1772 uint16_t ident; 1773 int ret; 1774 1775 if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) && 1776 udf_fixed_to_variable(block) >= 1777 i_size_read(sb->s_bdev->bd_inode) >> sb->s_blocksize_bits) 1778 return -EAGAIN; 1779 1780 bh = udf_read_tagged(sb, block, block, &ident); 1781 if (!bh) 1782 return -EAGAIN; 1783 if (ident != TAG_IDENT_AVDP) { 1784 brelse(bh); 1785 return -EAGAIN; 1786 } 1787 ret = udf_load_sequence(sb, bh, fileset); 1788 brelse(bh); 1789 return ret; 1790 } 1791 1792 /* 1793 * Search for an anchor volume descriptor pointer. 1794 * 1795 * Returns < 0 on error, 0 on success. -EAGAIN is special - try next set 1796 * of anchors. 1797 */ 1798 static int udf_scan_anchors(struct super_block *sb, sector_t *lastblock, 1799 struct kernel_lb_addr *fileset) 1800 { 1801 sector_t last[6]; 1802 int i; 1803 struct udf_sb_info *sbi = UDF_SB(sb); 1804 int last_count = 0; 1805 int ret; 1806 1807 /* First try user provided anchor */ 1808 if (sbi->s_anchor) { 1809 ret = udf_check_anchor_block(sb, sbi->s_anchor, fileset); 1810 if (ret != -EAGAIN) 1811 return ret; 1812 } 1813 /* 1814 * according to spec, anchor is in either: 1815 * block 256 1816 * lastblock-256 1817 * lastblock 1818 * however, if the disc isn't closed, it could be 512. 1819 */ 1820 ret = udf_check_anchor_block(sb, sbi->s_session + 256, fileset); 1821 if (ret != -EAGAIN) 1822 return ret; 1823 /* 1824 * The trouble is which block is the last one. Drives often misreport 1825 * this so we try various possibilities. 1826 */ 1827 last[last_count++] = *lastblock; 1828 if (*lastblock >= 1) 1829 last[last_count++] = *lastblock - 1; 1830 last[last_count++] = *lastblock + 1; 1831 if (*lastblock >= 2) 1832 last[last_count++] = *lastblock - 2; 1833 if (*lastblock >= 150) 1834 last[last_count++] = *lastblock - 150; 1835 if (*lastblock >= 152) 1836 last[last_count++] = *lastblock - 152; 1837 1838 for (i = 0; i < last_count; i++) { 1839 if (last[i] >= i_size_read(sb->s_bdev->bd_inode) >> 1840 sb->s_blocksize_bits) 1841 continue; 1842 ret = udf_check_anchor_block(sb, last[i], fileset); 1843 if (ret != -EAGAIN) { 1844 if (!ret) 1845 *lastblock = last[i]; 1846 return ret; 1847 } 1848 if (last[i] < 256) 1849 continue; 1850 ret = udf_check_anchor_block(sb, last[i] - 256, fileset); 1851 if (ret != -EAGAIN) { 1852 if (!ret) 1853 *lastblock = last[i]; 1854 return ret; 1855 } 1856 } 1857 1858 /* Finally try block 512 in case media is open */ 1859 return udf_check_anchor_block(sb, sbi->s_session + 512, fileset); 1860 } 1861 1862 /* 1863 * Find an anchor volume descriptor and load Volume Descriptor Sequence from 1864 * area specified by it. The function expects sbi->s_lastblock to be the last 1865 * block on the media. 1866 * 1867 * Return <0 on error, 0 if anchor found. -EAGAIN is special meaning anchor 1868 * was not found. 1869 */ 1870 static int udf_find_anchor(struct super_block *sb, 1871 struct kernel_lb_addr *fileset) 1872 { 1873 struct udf_sb_info *sbi = UDF_SB(sb); 1874 sector_t lastblock = sbi->s_last_block; 1875 int ret; 1876 1877 ret = udf_scan_anchors(sb, &lastblock, fileset); 1878 if (ret != -EAGAIN) 1879 goto out; 1880 1881 /* No anchor found? Try VARCONV conversion of block numbers */ 1882 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV); 1883 lastblock = udf_variable_to_fixed(sbi->s_last_block); 1884 /* Firstly, we try to not convert number of the last block */ 1885 ret = udf_scan_anchors(sb, &lastblock, fileset); 1886 if (ret != -EAGAIN) 1887 goto out; 1888 1889 lastblock = sbi->s_last_block; 1890 /* Secondly, we try with converted number of the last block */ 1891 ret = udf_scan_anchors(sb, &lastblock, fileset); 1892 if (ret < 0) { 1893 /* VARCONV didn't help. Clear it. */ 1894 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV); 1895 } 1896 out: 1897 if (ret == 0) 1898 sbi->s_last_block = lastblock; 1899 return ret; 1900 } 1901 1902 /* 1903 * Check Volume Structure Descriptor, find Anchor block and load Volume 1904 * Descriptor Sequence. 1905 * 1906 * Returns < 0 on error, 0 on success. -EAGAIN is special meaning anchor 1907 * block was not found. 1908 */ 1909 static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt, 1910 int silent, struct kernel_lb_addr *fileset) 1911 { 1912 struct udf_sb_info *sbi = UDF_SB(sb); 1913 loff_t nsr_off; 1914 int ret; 1915 1916 if (!sb_set_blocksize(sb, uopt->blocksize)) { 1917 if (!silent) 1918 udf_warn(sb, "Bad block size\n"); 1919 return -EINVAL; 1920 } 1921 sbi->s_last_block = uopt->lastblock; 1922 if (!uopt->novrs) { 1923 /* Check that it is NSR02 compliant */ 1924 nsr_off = udf_check_vsd(sb); 1925 if (!nsr_off) { 1926 if (!silent) 1927 udf_warn(sb, "No VRS found\n"); 1928 return -EINVAL; 1929 } 1930 if (nsr_off == -1) 1931 udf_debug("Failed to read sector at offset %d. " 1932 "Assuming open disc. Skipping validity " 1933 "check\n", VSD_FIRST_SECTOR_OFFSET); 1934 if (!sbi->s_last_block) 1935 sbi->s_last_block = udf_get_last_block(sb); 1936 } else { 1937 udf_debug("Validity check skipped because of novrs option\n"); 1938 } 1939 1940 /* Look for anchor block and load Volume Descriptor Sequence */ 1941 sbi->s_anchor = uopt->anchor; 1942 ret = udf_find_anchor(sb, fileset); 1943 if (ret < 0) { 1944 if (!silent && ret == -EAGAIN) 1945 udf_warn(sb, "No anchor found\n"); 1946 return ret; 1947 } 1948 return 0; 1949 } 1950 1951 static void udf_finalize_lvid(struct logicalVolIntegrityDesc *lvid) 1952 { 1953 struct timespec64 ts; 1954 1955 ktime_get_real_ts64(&ts); 1956 udf_time_to_disk_stamp(&lvid->recordingDateAndTime, ts); 1957 lvid->descTag.descCRC = cpu_to_le16( 1958 crc_itu_t(0, (char *)lvid + sizeof(struct tag), 1959 le16_to_cpu(lvid->descTag.descCRCLength))); 1960 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag); 1961 } 1962 1963 static void udf_open_lvid(struct super_block *sb) 1964 { 1965 struct udf_sb_info *sbi = UDF_SB(sb); 1966 struct buffer_head *bh = sbi->s_lvid_bh; 1967 struct logicalVolIntegrityDesc *lvid; 1968 struct logicalVolIntegrityDescImpUse *lvidiu; 1969 1970 if (!bh) 1971 return; 1972 lvid = (struct logicalVolIntegrityDesc *)bh->b_data; 1973 lvidiu = udf_sb_lvidiu(sb); 1974 if (!lvidiu) 1975 return; 1976 1977 mutex_lock(&sbi->s_alloc_mutex); 1978 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX; 1979 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX; 1980 if (le32_to_cpu(lvid->integrityType) == LVID_INTEGRITY_TYPE_CLOSE) 1981 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN); 1982 else 1983 UDF_SET_FLAG(sb, UDF_FLAG_INCONSISTENT); 1984 1985 udf_finalize_lvid(lvid); 1986 mark_buffer_dirty(bh); 1987 sbi->s_lvid_dirty = 0; 1988 mutex_unlock(&sbi->s_alloc_mutex); 1989 /* Make opening of filesystem visible on the media immediately */ 1990 sync_dirty_buffer(bh); 1991 } 1992 1993 static void udf_close_lvid(struct super_block *sb) 1994 { 1995 struct udf_sb_info *sbi = UDF_SB(sb); 1996 struct buffer_head *bh = sbi->s_lvid_bh; 1997 struct logicalVolIntegrityDesc *lvid; 1998 struct logicalVolIntegrityDescImpUse *lvidiu; 1999 2000 if (!bh) 2001 return; 2002 lvid = (struct logicalVolIntegrityDesc *)bh->b_data; 2003 lvidiu = udf_sb_lvidiu(sb); 2004 if (!lvidiu) 2005 return; 2006 2007 mutex_lock(&sbi->s_alloc_mutex); 2008 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX; 2009 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX; 2010 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev)) 2011 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION); 2012 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev)) 2013 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev); 2014 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev)) 2015 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev); 2016 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_INCONSISTENT)) 2017 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE); 2018 2019 /* 2020 * We set buffer uptodate unconditionally here to avoid spurious 2021 * warnings from mark_buffer_dirty() when previous EIO has marked 2022 * the buffer as !uptodate 2023 */ 2024 set_buffer_uptodate(bh); 2025 udf_finalize_lvid(lvid); 2026 mark_buffer_dirty(bh); 2027 sbi->s_lvid_dirty = 0; 2028 mutex_unlock(&sbi->s_alloc_mutex); 2029 /* Make closing of filesystem visible on the media immediately */ 2030 sync_dirty_buffer(bh); 2031 } 2032 2033 u64 lvid_get_unique_id(struct super_block *sb) 2034 { 2035 struct buffer_head *bh; 2036 struct udf_sb_info *sbi = UDF_SB(sb); 2037 struct logicalVolIntegrityDesc *lvid; 2038 struct logicalVolHeaderDesc *lvhd; 2039 u64 uniqueID; 2040 u64 ret; 2041 2042 bh = sbi->s_lvid_bh; 2043 if (!bh) 2044 return 0; 2045 2046 lvid = (struct logicalVolIntegrityDesc *)bh->b_data; 2047 lvhd = (struct logicalVolHeaderDesc *)lvid->logicalVolContentsUse; 2048 2049 mutex_lock(&sbi->s_alloc_mutex); 2050 ret = uniqueID = le64_to_cpu(lvhd->uniqueID); 2051 if (!(++uniqueID & 0xFFFFFFFF)) 2052 uniqueID += 16; 2053 lvhd->uniqueID = cpu_to_le64(uniqueID); 2054 udf_updated_lvid(sb); 2055 mutex_unlock(&sbi->s_alloc_mutex); 2056 2057 return ret; 2058 } 2059 2060 static int udf_fill_super(struct super_block *sb, void *options, int silent) 2061 { 2062 int ret = -EINVAL; 2063 struct inode *inode = NULL; 2064 struct udf_options uopt; 2065 struct kernel_lb_addr rootdir, fileset; 2066 struct udf_sb_info *sbi; 2067 bool lvid_open = false; 2068 2069 uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT); 2070 /* By default we'll use overflow[ug]id when UDF inode [ug]id == -1 */ 2071 uopt.uid = make_kuid(current_user_ns(), overflowuid); 2072 uopt.gid = make_kgid(current_user_ns(), overflowgid); 2073 uopt.umask = 0; 2074 uopt.fmode = UDF_INVALID_MODE; 2075 uopt.dmode = UDF_INVALID_MODE; 2076 uopt.nls_map = NULL; 2077 2078 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 2079 if (!sbi) 2080 return -ENOMEM; 2081 2082 sb->s_fs_info = sbi; 2083 2084 mutex_init(&sbi->s_alloc_mutex); 2085 2086 if (!udf_parse_options((char *)options, &uopt, false)) 2087 goto parse_options_failure; 2088 2089 if (uopt.flags & (1 << UDF_FLAG_UTF8) && 2090 uopt.flags & (1 << UDF_FLAG_NLS_MAP)) { 2091 udf_err(sb, "utf8 cannot be combined with iocharset\n"); 2092 goto parse_options_failure; 2093 } 2094 if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) { 2095 uopt.nls_map = load_nls_default(); 2096 if (!uopt.nls_map) 2097 uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP); 2098 else 2099 udf_debug("Using default NLS map\n"); 2100 } 2101 if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP))) 2102 uopt.flags |= (1 << UDF_FLAG_UTF8); 2103 2104 fileset.logicalBlockNum = 0xFFFFFFFF; 2105 fileset.partitionReferenceNum = 0xFFFF; 2106 2107 sbi->s_flags = uopt.flags; 2108 sbi->s_uid = uopt.uid; 2109 sbi->s_gid = uopt.gid; 2110 sbi->s_umask = uopt.umask; 2111 sbi->s_fmode = uopt.fmode; 2112 sbi->s_dmode = uopt.dmode; 2113 sbi->s_nls_map = uopt.nls_map; 2114 rwlock_init(&sbi->s_cred_lock); 2115 2116 if (uopt.session == 0xFFFFFFFF) 2117 sbi->s_session = udf_get_last_session(sb); 2118 else 2119 sbi->s_session = uopt.session; 2120 2121 udf_debug("Multi-session=%d\n", sbi->s_session); 2122 2123 /* Fill in the rest of the superblock */ 2124 sb->s_op = &udf_sb_ops; 2125 sb->s_export_op = &udf_export_ops; 2126 2127 sb->s_magic = UDF_SUPER_MAGIC; 2128 sb->s_time_gran = 1000; 2129 2130 if (uopt.flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) { 2131 ret = udf_load_vrs(sb, &uopt, silent, &fileset); 2132 } else { 2133 uopt.blocksize = bdev_logical_block_size(sb->s_bdev); 2134 while (uopt.blocksize <= 4096) { 2135 ret = udf_load_vrs(sb, &uopt, silent, &fileset); 2136 if (ret < 0) { 2137 if (!silent && ret != -EACCES) { 2138 pr_notice("Scanning with blocksize %u failed\n", 2139 uopt.blocksize); 2140 } 2141 brelse(sbi->s_lvid_bh); 2142 sbi->s_lvid_bh = NULL; 2143 /* 2144 * EACCES is special - we want to propagate to 2145 * upper layers that we cannot handle RW mount. 2146 */ 2147 if (ret == -EACCES) 2148 break; 2149 } else 2150 break; 2151 2152 uopt.blocksize <<= 1; 2153 } 2154 } 2155 if (ret < 0) { 2156 if (ret == -EAGAIN) { 2157 udf_warn(sb, "No partition found (1)\n"); 2158 ret = -EINVAL; 2159 } 2160 goto error_out; 2161 } 2162 2163 udf_debug("Lastblock=%u\n", sbi->s_last_block); 2164 2165 if (sbi->s_lvid_bh) { 2166 struct logicalVolIntegrityDescImpUse *lvidiu = 2167 udf_sb_lvidiu(sb); 2168 uint16_t minUDFReadRev; 2169 uint16_t minUDFWriteRev; 2170 2171 if (!lvidiu) { 2172 ret = -EINVAL; 2173 goto error_out; 2174 } 2175 minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev); 2176 minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev); 2177 if (minUDFReadRev > UDF_MAX_READ_VERSION) { 2178 udf_err(sb, "minUDFReadRev=%x (max is %x)\n", 2179 minUDFReadRev, 2180 UDF_MAX_READ_VERSION); 2181 ret = -EINVAL; 2182 goto error_out; 2183 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION) { 2184 if (!sb_rdonly(sb)) { 2185 ret = -EACCES; 2186 goto error_out; 2187 } 2188 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT); 2189 } 2190 2191 sbi->s_udfrev = minUDFWriteRev; 2192 2193 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE) 2194 UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE); 2195 if (minUDFReadRev >= UDF_VERS_USE_STREAMS) 2196 UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS); 2197 } 2198 2199 if (!sbi->s_partitions) { 2200 udf_warn(sb, "No partition found (2)\n"); 2201 ret = -EINVAL; 2202 goto error_out; 2203 } 2204 2205 if (sbi->s_partmaps[sbi->s_partition].s_partition_flags & 2206 UDF_PART_FLAG_READ_ONLY) { 2207 if (!sb_rdonly(sb)) { 2208 ret = -EACCES; 2209 goto error_out; 2210 } 2211 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT); 2212 } 2213 2214 if (udf_find_fileset(sb, &fileset, &rootdir)) { 2215 udf_warn(sb, "No fileset found\n"); 2216 ret = -EINVAL; 2217 goto error_out; 2218 } 2219 2220 if (!silent) { 2221 struct timestamp ts; 2222 udf_time_to_disk_stamp(&ts, sbi->s_record_time); 2223 udf_info("Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n", 2224 sbi->s_volume_ident, 2225 le16_to_cpu(ts.year), ts.month, ts.day, 2226 ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone)); 2227 } 2228 if (!sb_rdonly(sb)) { 2229 udf_open_lvid(sb); 2230 lvid_open = true; 2231 } 2232 2233 /* Assign the root inode */ 2234 /* assign inodes by physical block number */ 2235 /* perhaps it's not extensible enough, but for now ... */ 2236 inode = udf_iget(sb, &rootdir); 2237 if (IS_ERR(inode)) { 2238 udf_err(sb, "Error in udf_iget, block=%u, partition=%u\n", 2239 rootdir.logicalBlockNum, rootdir.partitionReferenceNum); 2240 ret = PTR_ERR(inode); 2241 goto error_out; 2242 } 2243 2244 /* Allocate a dentry for the root inode */ 2245 sb->s_root = d_make_root(inode); 2246 if (!sb->s_root) { 2247 udf_err(sb, "Couldn't allocate root dentry\n"); 2248 ret = -ENOMEM; 2249 goto error_out; 2250 } 2251 sb->s_maxbytes = MAX_LFS_FILESIZE; 2252 sb->s_max_links = UDF_MAX_LINKS; 2253 return 0; 2254 2255 error_out: 2256 iput(sbi->s_vat_inode); 2257 parse_options_failure: 2258 if (uopt.nls_map) 2259 unload_nls(uopt.nls_map); 2260 if (lvid_open) 2261 udf_close_lvid(sb); 2262 brelse(sbi->s_lvid_bh); 2263 udf_sb_free_partitions(sb); 2264 kfree(sbi); 2265 sb->s_fs_info = NULL; 2266 2267 return ret; 2268 } 2269 2270 void _udf_err(struct super_block *sb, const char *function, 2271 const char *fmt, ...) 2272 { 2273 struct va_format vaf; 2274 va_list args; 2275 2276 va_start(args, fmt); 2277 2278 vaf.fmt = fmt; 2279 vaf.va = &args; 2280 2281 pr_err("error (device %s): %s: %pV", sb->s_id, function, &vaf); 2282 2283 va_end(args); 2284 } 2285 2286 void _udf_warn(struct super_block *sb, const char *function, 2287 const char *fmt, ...) 2288 { 2289 struct va_format vaf; 2290 va_list args; 2291 2292 va_start(args, fmt); 2293 2294 vaf.fmt = fmt; 2295 vaf.va = &args; 2296 2297 pr_warn("warning (device %s): %s: %pV", sb->s_id, function, &vaf); 2298 2299 va_end(args); 2300 } 2301 2302 static void udf_put_super(struct super_block *sb) 2303 { 2304 struct udf_sb_info *sbi; 2305 2306 sbi = UDF_SB(sb); 2307 2308 iput(sbi->s_vat_inode); 2309 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP)) 2310 unload_nls(sbi->s_nls_map); 2311 if (!sb_rdonly(sb)) 2312 udf_close_lvid(sb); 2313 brelse(sbi->s_lvid_bh); 2314 udf_sb_free_partitions(sb); 2315 mutex_destroy(&sbi->s_alloc_mutex); 2316 kfree(sb->s_fs_info); 2317 sb->s_fs_info = NULL; 2318 } 2319 2320 static int udf_sync_fs(struct super_block *sb, int wait) 2321 { 2322 struct udf_sb_info *sbi = UDF_SB(sb); 2323 2324 mutex_lock(&sbi->s_alloc_mutex); 2325 if (sbi->s_lvid_dirty) { 2326 struct buffer_head *bh = sbi->s_lvid_bh; 2327 struct logicalVolIntegrityDesc *lvid; 2328 2329 lvid = (struct logicalVolIntegrityDesc *)bh->b_data; 2330 udf_finalize_lvid(lvid); 2331 2332 /* 2333 * Blockdevice will be synced later so we don't have to submit 2334 * the buffer for IO 2335 */ 2336 mark_buffer_dirty(bh); 2337 sbi->s_lvid_dirty = 0; 2338 } 2339 mutex_unlock(&sbi->s_alloc_mutex); 2340 2341 return 0; 2342 } 2343 2344 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf) 2345 { 2346 struct super_block *sb = dentry->d_sb; 2347 struct udf_sb_info *sbi = UDF_SB(sb); 2348 struct logicalVolIntegrityDescImpUse *lvidiu; 2349 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 2350 2351 lvidiu = udf_sb_lvidiu(sb); 2352 buf->f_type = UDF_SUPER_MAGIC; 2353 buf->f_bsize = sb->s_blocksize; 2354 buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len; 2355 buf->f_bfree = udf_count_free(sb); 2356 buf->f_bavail = buf->f_bfree; 2357 buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) + 2358 le32_to_cpu(lvidiu->numDirs)) : 0) 2359 + buf->f_bfree; 2360 buf->f_ffree = buf->f_bfree; 2361 buf->f_namelen = UDF_NAME_LEN; 2362 buf->f_fsid.val[0] = (u32)id; 2363 buf->f_fsid.val[1] = (u32)(id >> 32); 2364 2365 return 0; 2366 } 2367 2368 static unsigned int udf_count_free_bitmap(struct super_block *sb, 2369 struct udf_bitmap *bitmap) 2370 { 2371 struct buffer_head *bh = NULL; 2372 unsigned int accum = 0; 2373 int index; 2374 udf_pblk_t block = 0, newblock; 2375 struct kernel_lb_addr loc; 2376 uint32_t bytes; 2377 uint8_t *ptr; 2378 uint16_t ident; 2379 struct spaceBitmapDesc *bm; 2380 2381 loc.logicalBlockNum = bitmap->s_extPosition; 2382 loc.partitionReferenceNum = UDF_SB(sb)->s_partition; 2383 bh = udf_read_ptagged(sb, &loc, 0, &ident); 2384 2385 if (!bh) { 2386 udf_err(sb, "udf_count_free failed\n"); 2387 goto out; 2388 } else if (ident != TAG_IDENT_SBD) { 2389 brelse(bh); 2390 udf_err(sb, "udf_count_free failed\n"); 2391 goto out; 2392 } 2393 2394 bm = (struct spaceBitmapDesc *)bh->b_data; 2395 bytes = le32_to_cpu(bm->numOfBytes); 2396 index = sizeof(struct spaceBitmapDesc); /* offset in first block only */ 2397 ptr = (uint8_t *)bh->b_data; 2398 2399 while (bytes > 0) { 2400 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index); 2401 accum += bitmap_weight((const unsigned long *)(ptr + index), 2402 cur_bytes * 8); 2403 bytes -= cur_bytes; 2404 if (bytes) { 2405 brelse(bh); 2406 newblock = udf_get_lb_pblock(sb, &loc, ++block); 2407 bh = udf_tread(sb, newblock); 2408 if (!bh) { 2409 udf_debug("read failed\n"); 2410 goto out; 2411 } 2412 index = 0; 2413 ptr = (uint8_t *)bh->b_data; 2414 } 2415 } 2416 brelse(bh); 2417 out: 2418 return accum; 2419 } 2420 2421 static unsigned int udf_count_free_table(struct super_block *sb, 2422 struct inode *table) 2423 { 2424 unsigned int accum = 0; 2425 uint32_t elen; 2426 struct kernel_lb_addr eloc; 2427 int8_t etype; 2428 struct extent_position epos; 2429 2430 mutex_lock(&UDF_SB(sb)->s_alloc_mutex); 2431 epos.block = UDF_I(table)->i_location; 2432 epos.offset = sizeof(struct unallocSpaceEntry); 2433 epos.bh = NULL; 2434 2435 while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1) 2436 accum += (elen >> table->i_sb->s_blocksize_bits); 2437 2438 brelse(epos.bh); 2439 mutex_unlock(&UDF_SB(sb)->s_alloc_mutex); 2440 2441 return accum; 2442 } 2443 2444 static unsigned int udf_count_free(struct super_block *sb) 2445 { 2446 unsigned int accum = 0; 2447 struct udf_sb_info *sbi; 2448 struct udf_part_map *map; 2449 2450 sbi = UDF_SB(sb); 2451 if (sbi->s_lvid_bh) { 2452 struct logicalVolIntegrityDesc *lvid = 2453 (struct logicalVolIntegrityDesc *) 2454 sbi->s_lvid_bh->b_data; 2455 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) { 2456 accum = le32_to_cpu( 2457 lvid->freeSpaceTable[sbi->s_partition]); 2458 if (accum == 0xFFFFFFFF) 2459 accum = 0; 2460 } 2461 } 2462 2463 if (accum) 2464 return accum; 2465 2466 map = &sbi->s_partmaps[sbi->s_partition]; 2467 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) { 2468 accum += udf_count_free_bitmap(sb, 2469 map->s_uspace.s_bitmap); 2470 } 2471 if (accum) 2472 return accum; 2473 2474 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) { 2475 accum += udf_count_free_table(sb, 2476 map->s_uspace.s_table); 2477 } 2478 return accum; 2479 } 2480 2481 MODULE_AUTHOR("Ben Fennema"); 2482 MODULE_DESCRIPTION("Universal Disk Format Filesystem"); 2483 MODULE_LICENSE("GPL"); 2484 module_init(init_udf_fs) 2485 module_exit(exit_udf_fs) 2486