1 /* 2 * super.c 3 * 4 * PURPOSE 5 * Super block routines for the OSTA-UDF(tm) filesystem. 6 * 7 * DESCRIPTION 8 * OSTA-UDF(tm) = Optical Storage Technology Association 9 * Universal Disk Format. 10 * 11 * This code is based on version 2.00 of the UDF specification, 12 * and revision 3 of the ECMA 167 standard [equivalent to ISO 13346]. 13 * http://www.osta.org/ 14 * http://www.ecma.ch/ 15 * http://www.iso.org/ 16 * 17 * COPYRIGHT 18 * This file is distributed under the terms of the GNU General Public 19 * License (GPL). Copies of the GPL can be obtained from: 20 * ftp://prep.ai.mit.edu/pub/gnu/GPL 21 * Each contributing author retains all rights to their own work. 22 * 23 * (C) 1998 Dave Boynton 24 * (C) 1998-2004 Ben Fennema 25 * (C) 2000 Stelias Computing Inc 26 * 27 * HISTORY 28 * 29 * 09/24/98 dgb changed to allow compiling outside of kernel, and 30 * added some debugging. 31 * 10/01/98 dgb updated to allow (some) possibility of compiling w/2.0.34 32 * 10/16/98 attempting some multi-session support 33 * 10/17/98 added freespace count for "df" 34 * 11/11/98 gr added novrs option 35 * 11/26/98 dgb added fileset,anchor mount options 36 * 12/06/98 blf really hosed things royally. vat/sparing support. sequenced 37 * vol descs. rewrote option handling based on isofs 38 * 12/20/98 find the free space bitmap (if it exists) 39 */ 40 41 #include "udfdecl.h" 42 43 #include <linux/blkdev.h> 44 #include <linux/slab.h> 45 #include <linux/kernel.h> 46 #include <linux/module.h> 47 #include <linux/parser.h> 48 #include <linux/stat.h> 49 #include <linux/cdrom.h> 50 #include <linux/nls.h> 51 #include <linux/vfs.h> 52 #include <linux/vmalloc.h> 53 #include <linux/errno.h> 54 #include <linux/mount.h> 55 #include <linux/seq_file.h> 56 #include <linux/bitmap.h> 57 #include <linux/crc-itu-t.h> 58 #include <linux/log2.h> 59 #include <asm/byteorder.h> 60 61 #include "udf_sb.h" 62 #include "udf_i.h" 63 64 #include <linux/init.h> 65 #include <linux/uaccess.h> 66 67 enum { 68 VDS_POS_PRIMARY_VOL_DESC, 69 VDS_POS_UNALLOC_SPACE_DESC, 70 VDS_POS_LOGICAL_VOL_DESC, 71 VDS_POS_IMP_USE_VOL_DESC, 72 VDS_POS_LENGTH 73 }; 74 75 #define VSD_FIRST_SECTOR_OFFSET 32768 76 #define VSD_MAX_SECTOR_OFFSET 0x800000 77 78 /* 79 * Maximum number of Terminating Descriptor / Logical Volume Integrity 80 * Descriptor redirections. The chosen numbers are arbitrary - just that we 81 * hopefully don't limit any real use of rewritten inode on write-once media 82 * but avoid looping for too long on corrupted media. 83 */ 84 #define UDF_MAX_TD_NESTING 64 85 #define UDF_MAX_LVID_NESTING 1000 86 87 enum { UDF_MAX_LINKS = 0xffff }; 88 89 /* These are the "meat" - everything else is stuffing */ 90 static int udf_fill_super(struct super_block *, void *, int); 91 static void udf_put_super(struct super_block *); 92 static int udf_sync_fs(struct super_block *, int); 93 static int udf_remount_fs(struct super_block *, int *, char *); 94 static void udf_load_logicalvolint(struct super_block *, struct kernel_extent_ad); 95 static int udf_find_fileset(struct super_block *, struct kernel_lb_addr *, 96 struct kernel_lb_addr *); 97 static void udf_load_fileset(struct super_block *, struct buffer_head *, 98 struct kernel_lb_addr *); 99 static void udf_open_lvid(struct super_block *); 100 static void udf_close_lvid(struct super_block *); 101 static unsigned int udf_count_free(struct super_block *); 102 static int udf_statfs(struct dentry *, struct kstatfs *); 103 static int udf_show_options(struct seq_file *, struct dentry *); 104 105 struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct super_block *sb) 106 { 107 struct logicalVolIntegrityDesc *lvid; 108 unsigned int partnum; 109 unsigned int offset; 110 111 if (!UDF_SB(sb)->s_lvid_bh) 112 return NULL; 113 lvid = (struct logicalVolIntegrityDesc *)UDF_SB(sb)->s_lvid_bh->b_data; 114 partnum = le32_to_cpu(lvid->numOfPartitions); 115 if ((sb->s_blocksize - sizeof(struct logicalVolIntegrityDescImpUse) - 116 offsetof(struct logicalVolIntegrityDesc, impUse)) / 117 (2 * sizeof(uint32_t)) < partnum) { 118 udf_err(sb, "Logical volume integrity descriptor corrupted " 119 "(numOfPartitions = %u)!\n", partnum); 120 return NULL; 121 } 122 /* The offset is to skip freeSpaceTable and sizeTable arrays */ 123 offset = partnum * 2 * sizeof(uint32_t); 124 return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]); 125 } 126 127 /* UDF filesystem type */ 128 static struct dentry *udf_mount(struct file_system_type *fs_type, 129 int flags, const char *dev_name, void *data) 130 { 131 return mount_bdev(fs_type, flags, dev_name, data, udf_fill_super); 132 } 133 134 static struct file_system_type udf_fstype = { 135 .owner = THIS_MODULE, 136 .name = "udf", 137 .mount = udf_mount, 138 .kill_sb = kill_block_super, 139 .fs_flags = FS_REQUIRES_DEV, 140 }; 141 MODULE_ALIAS_FS("udf"); 142 143 static struct kmem_cache *udf_inode_cachep; 144 145 static struct inode *udf_alloc_inode(struct super_block *sb) 146 { 147 struct udf_inode_info *ei; 148 ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL); 149 if (!ei) 150 return NULL; 151 152 ei->i_unique = 0; 153 ei->i_lenExtents = 0; 154 ei->i_next_alloc_block = 0; 155 ei->i_next_alloc_goal = 0; 156 ei->i_strat4096 = 0; 157 init_rwsem(&ei->i_data_sem); 158 ei->cached_extent.lstart = -1; 159 spin_lock_init(&ei->i_extent_cache_lock); 160 161 return &ei->vfs_inode; 162 } 163 164 static void udf_i_callback(struct rcu_head *head) 165 { 166 struct inode *inode = container_of(head, struct inode, i_rcu); 167 kmem_cache_free(udf_inode_cachep, UDF_I(inode)); 168 } 169 170 static void udf_destroy_inode(struct inode *inode) 171 { 172 call_rcu(&inode->i_rcu, udf_i_callback); 173 } 174 175 static void init_once(void *foo) 176 { 177 struct udf_inode_info *ei = (struct udf_inode_info *)foo; 178 179 ei->i_ext.i_data = NULL; 180 inode_init_once(&ei->vfs_inode); 181 } 182 183 static int __init init_inodecache(void) 184 { 185 udf_inode_cachep = kmem_cache_create("udf_inode_cache", 186 sizeof(struct udf_inode_info), 187 0, (SLAB_RECLAIM_ACCOUNT | 188 SLAB_MEM_SPREAD | 189 SLAB_ACCOUNT), 190 init_once); 191 if (!udf_inode_cachep) 192 return -ENOMEM; 193 return 0; 194 } 195 196 static void destroy_inodecache(void) 197 { 198 /* 199 * Make sure all delayed rcu free inodes are flushed before we 200 * destroy cache. 201 */ 202 rcu_barrier(); 203 kmem_cache_destroy(udf_inode_cachep); 204 } 205 206 /* Superblock operations */ 207 static const struct super_operations udf_sb_ops = { 208 .alloc_inode = udf_alloc_inode, 209 .destroy_inode = udf_destroy_inode, 210 .write_inode = udf_write_inode, 211 .evict_inode = udf_evict_inode, 212 .put_super = udf_put_super, 213 .sync_fs = udf_sync_fs, 214 .statfs = udf_statfs, 215 .remount_fs = udf_remount_fs, 216 .show_options = udf_show_options, 217 }; 218 219 struct udf_options { 220 unsigned char novrs; 221 unsigned int blocksize; 222 unsigned int session; 223 unsigned int lastblock; 224 unsigned int anchor; 225 unsigned int flags; 226 umode_t umask; 227 kgid_t gid; 228 kuid_t uid; 229 umode_t fmode; 230 umode_t dmode; 231 struct nls_table *nls_map; 232 }; 233 234 static int __init init_udf_fs(void) 235 { 236 int err; 237 238 err = init_inodecache(); 239 if (err) 240 goto out1; 241 err = register_filesystem(&udf_fstype); 242 if (err) 243 goto out; 244 245 return 0; 246 247 out: 248 destroy_inodecache(); 249 250 out1: 251 return err; 252 } 253 254 static void __exit exit_udf_fs(void) 255 { 256 unregister_filesystem(&udf_fstype); 257 destroy_inodecache(); 258 } 259 260 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count) 261 { 262 struct udf_sb_info *sbi = UDF_SB(sb); 263 264 sbi->s_partmaps = kcalloc(count, sizeof(*sbi->s_partmaps), GFP_KERNEL); 265 if (!sbi->s_partmaps) { 266 sbi->s_partitions = 0; 267 return -ENOMEM; 268 } 269 270 sbi->s_partitions = count; 271 return 0; 272 } 273 274 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap) 275 { 276 int i; 277 int nr_groups = bitmap->s_nr_groups; 278 279 for (i = 0; i < nr_groups; i++) 280 if (bitmap->s_block_bitmap[i]) 281 brelse(bitmap->s_block_bitmap[i]); 282 283 kvfree(bitmap); 284 } 285 286 static void udf_free_partition(struct udf_part_map *map) 287 { 288 int i; 289 struct udf_meta_data *mdata; 290 291 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) 292 iput(map->s_uspace.s_table); 293 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) 294 iput(map->s_fspace.s_table); 295 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) 296 udf_sb_free_bitmap(map->s_uspace.s_bitmap); 297 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) 298 udf_sb_free_bitmap(map->s_fspace.s_bitmap); 299 if (map->s_partition_type == UDF_SPARABLE_MAP15) 300 for (i = 0; i < 4; i++) 301 brelse(map->s_type_specific.s_sparing.s_spar_map[i]); 302 else if (map->s_partition_type == UDF_METADATA_MAP25) { 303 mdata = &map->s_type_specific.s_metadata; 304 iput(mdata->s_metadata_fe); 305 mdata->s_metadata_fe = NULL; 306 307 iput(mdata->s_mirror_fe); 308 mdata->s_mirror_fe = NULL; 309 310 iput(mdata->s_bitmap_fe); 311 mdata->s_bitmap_fe = NULL; 312 } 313 } 314 315 static void udf_sb_free_partitions(struct super_block *sb) 316 { 317 struct udf_sb_info *sbi = UDF_SB(sb); 318 int i; 319 320 if (!sbi->s_partmaps) 321 return; 322 for (i = 0; i < sbi->s_partitions; i++) 323 udf_free_partition(&sbi->s_partmaps[i]); 324 kfree(sbi->s_partmaps); 325 sbi->s_partmaps = NULL; 326 } 327 328 static int udf_show_options(struct seq_file *seq, struct dentry *root) 329 { 330 struct super_block *sb = root->d_sb; 331 struct udf_sb_info *sbi = UDF_SB(sb); 332 333 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT)) 334 seq_puts(seq, ",nostrict"); 335 if (UDF_QUERY_FLAG(sb, UDF_FLAG_BLOCKSIZE_SET)) 336 seq_printf(seq, ",bs=%lu", sb->s_blocksize); 337 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE)) 338 seq_puts(seq, ",unhide"); 339 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE)) 340 seq_puts(seq, ",undelete"); 341 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB)) 342 seq_puts(seq, ",noadinicb"); 343 if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD)) 344 seq_puts(seq, ",shortad"); 345 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET)) 346 seq_puts(seq, ",uid=forget"); 347 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET)) 348 seq_puts(seq, ",gid=forget"); 349 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET)) 350 seq_printf(seq, ",uid=%u", from_kuid(&init_user_ns, sbi->s_uid)); 351 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET)) 352 seq_printf(seq, ",gid=%u", from_kgid(&init_user_ns, sbi->s_gid)); 353 if (sbi->s_umask != 0) 354 seq_printf(seq, ",umask=%ho", sbi->s_umask); 355 if (sbi->s_fmode != UDF_INVALID_MODE) 356 seq_printf(seq, ",mode=%ho", sbi->s_fmode); 357 if (sbi->s_dmode != UDF_INVALID_MODE) 358 seq_printf(seq, ",dmode=%ho", sbi->s_dmode); 359 if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET)) 360 seq_printf(seq, ",session=%d", sbi->s_session); 361 if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET)) 362 seq_printf(seq, ",lastblock=%u", sbi->s_last_block); 363 if (sbi->s_anchor != 0) 364 seq_printf(seq, ",anchor=%u", sbi->s_anchor); 365 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8)) 366 seq_puts(seq, ",utf8"); 367 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map) 368 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset); 369 370 return 0; 371 } 372 373 /* 374 * udf_parse_options 375 * 376 * PURPOSE 377 * Parse mount options. 378 * 379 * DESCRIPTION 380 * The following mount options are supported: 381 * 382 * gid= Set the default group. 383 * umask= Set the default umask. 384 * mode= Set the default file permissions. 385 * dmode= Set the default directory permissions. 386 * uid= Set the default user. 387 * bs= Set the block size. 388 * unhide Show otherwise hidden files. 389 * undelete Show deleted files in lists. 390 * adinicb Embed data in the inode (default) 391 * noadinicb Don't embed data in the inode 392 * shortad Use short ad's 393 * longad Use long ad's (default) 394 * nostrict Unset strict conformance 395 * iocharset= Set the NLS character set 396 * 397 * The remaining are for debugging and disaster recovery: 398 * 399 * novrs Skip volume sequence recognition 400 * 401 * The following expect a offset from 0. 402 * 403 * session= Set the CDROM session (default= last session) 404 * anchor= Override standard anchor location. (default= 256) 405 * volume= Override the VolumeDesc location. (unused) 406 * partition= Override the PartitionDesc location. (unused) 407 * lastblock= Set the last block of the filesystem/ 408 * 409 * The following expect a offset from the partition root. 410 * 411 * fileset= Override the fileset block location. (unused) 412 * rootdir= Override the root directory location. (unused) 413 * WARNING: overriding the rootdir to a non-directory may 414 * yield highly unpredictable results. 415 * 416 * PRE-CONDITIONS 417 * options Pointer to mount options string. 418 * uopts Pointer to mount options variable. 419 * 420 * POST-CONDITIONS 421 * <return> 1 Mount options parsed okay. 422 * <return> 0 Error parsing mount options. 423 * 424 * HISTORY 425 * July 1, 1997 - Andrew E. Mileski 426 * Written, tested, and released. 427 */ 428 429 enum { 430 Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete, 431 Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad, 432 Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock, 433 Opt_anchor, Opt_volume, Opt_partition, Opt_fileset, 434 Opt_rootdir, Opt_utf8, Opt_iocharset, 435 Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore, 436 Opt_fmode, Opt_dmode 437 }; 438 439 static const match_table_t tokens = { 440 {Opt_novrs, "novrs"}, 441 {Opt_nostrict, "nostrict"}, 442 {Opt_bs, "bs=%u"}, 443 {Opt_unhide, "unhide"}, 444 {Opt_undelete, "undelete"}, 445 {Opt_noadinicb, "noadinicb"}, 446 {Opt_adinicb, "adinicb"}, 447 {Opt_shortad, "shortad"}, 448 {Opt_longad, "longad"}, 449 {Opt_uforget, "uid=forget"}, 450 {Opt_uignore, "uid=ignore"}, 451 {Opt_gforget, "gid=forget"}, 452 {Opt_gignore, "gid=ignore"}, 453 {Opt_gid, "gid=%u"}, 454 {Opt_uid, "uid=%u"}, 455 {Opt_umask, "umask=%o"}, 456 {Opt_session, "session=%u"}, 457 {Opt_lastblock, "lastblock=%u"}, 458 {Opt_anchor, "anchor=%u"}, 459 {Opt_volume, "volume=%u"}, 460 {Opt_partition, "partition=%u"}, 461 {Opt_fileset, "fileset=%u"}, 462 {Opt_rootdir, "rootdir=%u"}, 463 {Opt_utf8, "utf8"}, 464 {Opt_iocharset, "iocharset=%s"}, 465 {Opt_fmode, "mode=%o"}, 466 {Opt_dmode, "dmode=%o"}, 467 {Opt_err, NULL} 468 }; 469 470 static int udf_parse_options(char *options, struct udf_options *uopt, 471 bool remount) 472 { 473 char *p; 474 int option; 475 476 uopt->novrs = 0; 477 uopt->session = 0xFFFFFFFF; 478 uopt->lastblock = 0; 479 uopt->anchor = 0; 480 481 if (!options) 482 return 1; 483 484 while ((p = strsep(&options, ",")) != NULL) { 485 substring_t args[MAX_OPT_ARGS]; 486 int token; 487 unsigned n; 488 if (!*p) 489 continue; 490 491 token = match_token(p, tokens, args); 492 switch (token) { 493 case Opt_novrs: 494 uopt->novrs = 1; 495 break; 496 case Opt_bs: 497 if (match_int(&args[0], &option)) 498 return 0; 499 n = option; 500 if (n != 512 && n != 1024 && n != 2048 && n != 4096) 501 return 0; 502 uopt->blocksize = n; 503 uopt->flags |= (1 << UDF_FLAG_BLOCKSIZE_SET); 504 break; 505 case Opt_unhide: 506 uopt->flags |= (1 << UDF_FLAG_UNHIDE); 507 break; 508 case Opt_undelete: 509 uopt->flags |= (1 << UDF_FLAG_UNDELETE); 510 break; 511 case Opt_noadinicb: 512 uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB); 513 break; 514 case Opt_adinicb: 515 uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB); 516 break; 517 case Opt_shortad: 518 uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD); 519 break; 520 case Opt_longad: 521 uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD); 522 break; 523 case Opt_gid: 524 if (match_int(args, &option)) 525 return 0; 526 uopt->gid = make_kgid(current_user_ns(), option); 527 if (!gid_valid(uopt->gid)) 528 return 0; 529 uopt->flags |= (1 << UDF_FLAG_GID_SET); 530 break; 531 case Opt_uid: 532 if (match_int(args, &option)) 533 return 0; 534 uopt->uid = make_kuid(current_user_ns(), option); 535 if (!uid_valid(uopt->uid)) 536 return 0; 537 uopt->flags |= (1 << UDF_FLAG_UID_SET); 538 break; 539 case Opt_umask: 540 if (match_octal(args, &option)) 541 return 0; 542 uopt->umask = option; 543 break; 544 case Opt_nostrict: 545 uopt->flags &= ~(1 << UDF_FLAG_STRICT); 546 break; 547 case Opt_session: 548 if (match_int(args, &option)) 549 return 0; 550 uopt->session = option; 551 if (!remount) 552 uopt->flags |= (1 << UDF_FLAG_SESSION_SET); 553 break; 554 case Opt_lastblock: 555 if (match_int(args, &option)) 556 return 0; 557 uopt->lastblock = option; 558 if (!remount) 559 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET); 560 break; 561 case Opt_anchor: 562 if (match_int(args, &option)) 563 return 0; 564 uopt->anchor = option; 565 break; 566 case Opt_volume: 567 case Opt_partition: 568 case Opt_fileset: 569 case Opt_rootdir: 570 /* Ignored (never implemented properly) */ 571 break; 572 case Opt_utf8: 573 uopt->flags |= (1 << UDF_FLAG_UTF8); 574 break; 575 case Opt_iocharset: 576 if (!remount) { 577 if (uopt->nls_map) 578 unload_nls(uopt->nls_map); 579 uopt->nls_map = load_nls(args[0].from); 580 uopt->flags |= (1 << UDF_FLAG_NLS_MAP); 581 } 582 break; 583 case Opt_uforget: 584 uopt->flags |= (1 << UDF_FLAG_UID_FORGET); 585 break; 586 case Opt_uignore: 587 case Opt_gignore: 588 /* These options are superseeded by uid=<number> */ 589 break; 590 case Opt_gforget: 591 uopt->flags |= (1 << UDF_FLAG_GID_FORGET); 592 break; 593 case Opt_fmode: 594 if (match_octal(args, &option)) 595 return 0; 596 uopt->fmode = option & 0777; 597 break; 598 case Opt_dmode: 599 if (match_octal(args, &option)) 600 return 0; 601 uopt->dmode = option & 0777; 602 break; 603 default: 604 pr_err("bad mount option \"%s\" or missing value\n", p); 605 return 0; 606 } 607 } 608 return 1; 609 } 610 611 static int udf_remount_fs(struct super_block *sb, int *flags, char *options) 612 { 613 struct udf_options uopt; 614 struct udf_sb_info *sbi = UDF_SB(sb); 615 int error = 0; 616 struct logicalVolIntegrityDescImpUse *lvidiu = udf_sb_lvidiu(sb); 617 618 sync_filesystem(sb); 619 if (lvidiu) { 620 int write_rev = le16_to_cpu(lvidiu->minUDFWriteRev); 621 if (write_rev > UDF_MAX_WRITE_VERSION && !(*flags & SB_RDONLY)) 622 return -EACCES; 623 } 624 625 uopt.flags = sbi->s_flags; 626 uopt.uid = sbi->s_uid; 627 uopt.gid = sbi->s_gid; 628 uopt.umask = sbi->s_umask; 629 uopt.fmode = sbi->s_fmode; 630 uopt.dmode = sbi->s_dmode; 631 uopt.nls_map = NULL; 632 633 if (!udf_parse_options(options, &uopt, true)) 634 return -EINVAL; 635 636 write_lock(&sbi->s_cred_lock); 637 sbi->s_flags = uopt.flags; 638 sbi->s_uid = uopt.uid; 639 sbi->s_gid = uopt.gid; 640 sbi->s_umask = uopt.umask; 641 sbi->s_fmode = uopt.fmode; 642 sbi->s_dmode = uopt.dmode; 643 write_unlock(&sbi->s_cred_lock); 644 645 if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb)) 646 goto out_unlock; 647 648 if (*flags & SB_RDONLY) 649 udf_close_lvid(sb); 650 else 651 udf_open_lvid(sb); 652 653 out_unlock: 654 return error; 655 } 656 657 /* Check Volume Structure Descriptors (ECMA 167 2/9.1) */ 658 /* We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */ 659 static loff_t udf_check_vsd(struct super_block *sb) 660 { 661 struct volStructDesc *vsd = NULL; 662 loff_t sector = VSD_FIRST_SECTOR_OFFSET; 663 int sectorsize; 664 struct buffer_head *bh = NULL; 665 int nsr02 = 0; 666 int nsr03 = 0; 667 struct udf_sb_info *sbi; 668 669 sbi = UDF_SB(sb); 670 if (sb->s_blocksize < sizeof(struct volStructDesc)) 671 sectorsize = sizeof(struct volStructDesc); 672 else 673 sectorsize = sb->s_blocksize; 674 675 sector += (((loff_t)sbi->s_session) << sb->s_blocksize_bits); 676 677 udf_debug("Starting at sector %u (%lu byte sectors)\n", 678 (unsigned int)(sector >> sb->s_blocksize_bits), 679 sb->s_blocksize); 680 /* Process the sequence (if applicable). The hard limit on the sector 681 * offset is arbitrary, hopefully large enough so that all valid UDF 682 * filesystems will be recognised. There is no mention of an upper 683 * bound to the size of the volume recognition area in the standard. 684 * The limit will prevent the code to read all the sectors of a 685 * specially crafted image (like a bluray disc full of CD001 sectors), 686 * potentially causing minutes or even hours of uninterruptible I/O 687 * activity. This actually happened with uninitialised SSD partitions 688 * (all 0xFF) before the check for the limit and all valid IDs were 689 * added */ 690 for (; !nsr02 && !nsr03 && sector < VSD_MAX_SECTOR_OFFSET; 691 sector += sectorsize) { 692 /* Read a block */ 693 bh = udf_tread(sb, sector >> sb->s_blocksize_bits); 694 if (!bh) 695 break; 696 697 /* Look for ISO descriptors */ 698 vsd = (struct volStructDesc *)(bh->b_data + 699 (sector & (sb->s_blocksize - 1))); 700 701 if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001, 702 VSD_STD_ID_LEN)) { 703 switch (vsd->structType) { 704 case 0: 705 udf_debug("ISO9660 Boot Record found\n"); 706 break; 707 case 1: 708 udf_debug("ISO9660 Primary Volume Descriptor found\n"); 709 break; 710 case 2: 711 udf_debug("ISO9660 Supplementary Volume Descriptor found\n"); 712 break; 713 case 3: 714 udf_debug("ISO9660 Volume Partition Descriptor found\n"); 715 break; 716 case 255: 717 udf_debug("ISO9660 Volume Descriptor Set Terminator found\n"); 718 break; 719 default: 720 udf_debug("ISO9660 VRS (%u) found\n", 721 vsd->structType); 722 break; 723 } 724 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01, 725 VSD_STD_ID_LEN)) 726 ; /* nothing */ 727 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01, 728 VSD_STD_ID_LEN)) { 729 brelse(bh); 730 break; 731 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02, 732 VSD_STD_ID_LEN)) 733 nsr02 = sector; 734 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03, 735 VSD_STD_ID_LEN)) 736 nsr03 = sector; 737 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BOOT2, 738 VSD_STD_ID_LEN)) 739 ; /* nothing */ 740 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CDW02, 741 VSD_STD_ID_LEN)) 742 ; /* nothing */ 743 else { 744 /* invalid id : end of volume recognition area */ 745 brelse(bh); 746 break; 747 } 748 brelse(bh); 749 } 750 751 if (nsr03) 752 return nsr03; 753 else if (nsr02) 754 return nsr02; 755 else if (!bh && sector - (sbi->s_session << sb->s_blocksize_bits) == 756 VSD_FIRST_SECTOR_OFFSET) 757 return -1; 758 else 759 return 0; 760 } 761 762 static int udf_find_fileset(struct super_block *sb, 763 struct kernel_lb_addr *fileset, 764 struct kernel_lb_addr *root) 765 { 766 struct buffer_head *bh = NULL; 767 long lastblock; 768 uint16_t ident; 769 struct udf_sb_info *sbi; 770 771 if (fileset->logicalBlockNum != 0xFFFFFFFF || 772 fileset->partitionReferenceNum != 0xFFFF) { 773 bh = udf_read_ptagged(sb, fileset, 0, &ident); 774 775 if (!bh) { 776 return 1; 777 } else if (ident != TAG_IDENT_FSD) { 778 brelse(bh); 779 return 1; 780 } 781 782 } 783 784 sbi = UDF_SB(sb); 785 if (!bh) { 786 /* Search backwards through the partitions */ 787 struct kernel_lb_addr newfileset; 788 789 /* --> cvg: FIXME - is it reasonable? */ 790 return 1; 791 792 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1; 793 (newfileset.partitionReferenceNum != 0xFFFF && 794 fileset->logicalBlockNum == 0xFFFFFFFF && 795 fileset->partitionReferenceNum == 0xFFFF); 796 newfileset.partitionReferenceNum--) { 797 lastblock = sbi->s_partmaps 798 [newfileset.partitionReferenceNum] 799 .s_partition_len; 800 newfileset.logicalBlockNum = 0; 801 802 do { 803 bh = udf_read_ptagged(sb, &newfileset, 0, 804 &ident); 805 if (!bh) { 806 newfileset.logicalBlockNum++; 807 continue; 808 } 809 810 switch (ident) { 811 case TAG_IDENT_SBD: 812 { 813 struct spaceBitmapDesc *sp; 814 sp = (struct spaceBitmapDesc *) 815 bh->b_data; 816 newfileset.logicalBlockNum += 1 + 817 ((le32_to_cpu(sp->numOfBytes) + 818 sizeof(struct spaceBitmapDesc) 819 - 1) >> sb->s_blocksize_bits); 820 brelse(bh); 821 break; 822 } 823 case TAG_IDENT_FSD: 824 *fileset = newfileset; 825 break; 826 default: 827 newfileset.logicalBlockNum++; 828 brelse(bh); 829 bh = NULL; 830 break; 831 } 832 } while (newfileset.logicalBlockNum < lastblock && 833 fileset->logicalBlockNum == 0xFFFFFFFF && 834 fileset->partitionReferenceNum == 0xFFFF); 835 } 836 } 837 838 if ((fileset->logicalBlockNum != 0xFFFFFFFF || 839 fileset->partitionReferenceNum != 0xFFFF) && bh) { 840 udf_debug("Fileset at block=%u, partition=%u\n", 841 fileset->logicalBlockNum, 842 fileset->partitionReferenceNum); 843 844 sbi->s_partition = fileset->partitionReferenceNum; 845 udf_load_fileset(sb, bh, root); 846 brelse(bh); 847 return 0; 848 } 849 return 1; 850 } 851 852 /* 853 * Load primary Volume Descriptor Sequence 854 * 855 * Return <0 on error, 0 on success. -EAGAIN is special meaning next sequence 856 * should be tried. 857 */ 858 static int udf_load_pvoldesc(struct super_block *sb, sector_t block) 859 { 860 struct primaryVolDesc *pvoldesc; 861 uint8_t *outstr; 862 struct buffer_head *bh; 863 uint16_t ident; 864 int ret = -ENOMEM; 865 866 outstr = kmalloc(128, GFP_NOFS); 867 if (!outstr) 868 return -ENOMEM; 869 870 bh = udf_read_tagged(sb, block, block, &ident); 871 if (!bh) { 872 ret = -EAGAIN; 873 goto out2; 874 } 875 876 if (ident != TAG_IDENT_PVD) { 877 ret = -EIO; 878 goto out_bh; 879 } 880 881 pvoldesc = (struct primaryVolDesc *)bh->b_data; 882 883 if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time, 884 pvoldesc->recordingDateAndTime)) { 885 #ifdef UDFFS_DEBUG 886 struct timestamp *ts = &pvoldesc->recordingDateAndTime; 887 udf_debug("recording time %04u/%02u/%02u %02u:%02u (%x)\n", 888 le16_to_cpu(ts->year), ts->month, ts->day, ts->hour, 889 ts->minute, le16_to_cpu(ts->typeAndTimezone)); 890 #endif 891 } 892 893 ret = udf_dstrCS0toChar(sb, outstr, 31, pvoldesc->volIdent, 32); 894 if (ret < 0) 895 goto out_bh; 896 897 strncpy(UDF_SB(sb)->s_volume_ident, outstr, ret); 898 udf_debug("volIdent[] = '%s'\n", UDF_SB(sb)->s_volume_ident); 899 900 ret = udf_dstrCS0toChar(sb, outstr, 127, pvoldesc->volSetIdent, 128); 901 if (ret < 0) 902 goto out_bh; 903 904 outstr[ret] = 0; 905 udf_debug("volSetIdent[] = '%s'\n", outstr); 906 907 ret = 0; 908 out_bh: 909 brelse(bh); 910 out2: 911 kfree(outstr); 912 return ret; 913 } 914 915 struct inode *udf_find_metadata_inode_efe(struct super_block *sb, 916 u32 meta_file_loc, u32 partition_ref) 917 { 918 struct kernel_lb_addr addr; 919 struct inode *metadata_fe; 920 921 addr.logicalBlockNum = meta_file_loc; 922 addr.partitionReferenceNum = partition_ref; 923 924 metadata_fe = udf_iget_special(sb, &addr); 925 926 if (IS_ERR(metadata_fe)) { 927 udf_warn(sb, "metadata inode efe not found\n"); 928 return metadata_fe; 929 } 930 if (UDF_I(metadata_fe)->i_alloc_type != ICBTAG_FLAG_AD_SHORT) { 931 udf_warn(sb, "metadata inode efe does not have short allocation descriptors!\n"); 932 iput(metadata_fe); 933 return ERR_PTR(-EIO); 934 } 935 936 return metadata_fe; 937 } 938 939 static int udf_load_metadata_files(struct super_block *sb, int partition, 940 int type1_index) 941 { 942 struct udf_sb_info *sbi = UDF_SB(sb); 943 struct udf_part_map *map; 944 struct udf_meta_data *mdata; 945 struct kernel_lb_addr addr; 946 struct inode *fe; 947 948 map = &sbi->s_partmaps[partition]; 949 mdata = &map->s_type_specific.s_metadata; 950 mdata->s_phys_partition_ref = type1_index; 951 952 /* metadata address */ 953 udf_debug("Metadata file location: block = %u part = %u\n", 954 mdata->s_meta_file_loc, mdata->s_phys_partition_ref); 955 956 fe = udf_find_metadata_inode_efe(sb, mdata->s_meta_file_loc, 957 mdata->s_phys_partition_ref); 958 if (IS_ERR(fe)) { 959 /* mirror file entry */ 960 udf_debug("Mirror metadata file location: block = %u part = %u\n", 961 mdata->s_mirror_file_loc, mdata->s_phys_partition_ref); 962 963 fe = udf_find_metadata_inode_efe(sb, mdata->s_mirror_file_loc, 964 mdata->s_phys_partition_ref); 965 966 if (IS_ERR(fe)) { 967 udf_err(sb, "Both metadata and mirror metadata inode efe can not found\n"); 968 return PTR_ERR(fe); 969 } 970 mdata->s_mirror_fe = fe; 971 } else 972 mdata->s_metadata_fe = fe; 973 974 975 /* 976 * bitmap file entry 977 * Note: 978 * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102) 979 */ 980 if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) { 981 addr.logicalBlockNum = mdata->s_bitmap_file_loc; 982 addr.partitionReferenceNum = mdata->s_phys_partition_ref; 983 984 udf_debug("Bitmap file location: block = %u part = %u\n", 985 addr.logicalBlockNum, addr.partitionReferenceNum); 986 987 fe = udf_iget_special(sb, &addr); 988 if (IS_ERR(fe)) { 989 if (sb_rdonly(sb)) 990 udf_warn(sb, "bitmap inode efe not found but it's ok since the disc is mounted read-only\n"); 991 else { 992 udf_err(sb, "bitmap inode efe not found and attempted read-write mount\n"); 993 return PTR_ERR(fe); 994 } 995 } else 996 mdata->s_bitmap_fe = fe; 997 } 998 999 udf_debug("udf_load_metadata_files Ok\n"); 1000 return 0; 1001 } 1002 1003 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh, 1004 struct kernel_lb_addr *root) 1005 { 1006 struct fileSetDesc *fset; 1007 1008 fset = (struct fileSetDesc *)bh->b_data; 1009 1010 *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation); 1011 1012 UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum); 1013 1014 udf_debug("Rootdir at block=%u, partition=%u\n", 1015 root->logicalBlockNum, root->partitionReferenceNum); 1016 } 1017 1018 int udf_compute_nr_groups(struct super_block *sb, u32 partition) 1019 { 1020 struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition]; 1021 return DIV_ROUND_UP(map->s_partition_len + 1022 (sizeof(struct spaceBitmapDesc) << 3), 1023 sb->s_blocksize * 8); 1024 } 1025 1026 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index) 1027 { 1028 struct udf_bitmap *bitmap; 1029 int nr_groups; 1030 int size; 1031 1032 nr_groups = udf_compute_nr_groups(sb, index); 1033 size = sizeof(struct udf_bitmap) + 1034 (sizeof(struct buffer_head *) * nr_groups); 1035 1036 if (size <= PAGE_SIZE) 1037 bitmap = kzalloc(size, GFP_KERNEL); 1038 else 1039 bitmap = vzalloc(size); /* TODO: get rid of vzalloc */ 1040 1041 if (!bitmap) 1042 return NULL; 1043 1044 bitmap->s_nr_groups = nr_groups; 1045 return bitmap; 1046 } 1047 1048 static int udf_fill_partdesc_info(struct super_block *sb, 1049 struct partitionDesc *p, int p_index) 1050 { 1051 struct udf_part_map *map; 1052 struct udf_sb_info *sbi = UDF_SB(sb); 1053 struct partitionHeaderDesc *phd; 1054 1055 map = &sbi->s_partmaps[p_index]; 1056 1057 map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */ 1058 map->s_partition_root = le32_to_cpu(p->partitionStartingLocation); 1059 1060 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY)) 1061 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY; 1062 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE)) 1063 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE; 1064 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE)) 1065 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE; 1066 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE)) 1067 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE; 1068 1069 udf_debug("Partition (%d type %x) starts at physical %u, block length %u\n", 1070 p_index, map->s_partition_type, 1071 map->s_partition_root, map->s_partition_len); 1072 1073 if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) && 1074 strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03)) 1075 return 0; 1076 1077 phd = (struct partitionHeaderDesc *)p->partitionContentsUse; 1078 if (phd->unallocSpaceTable.extLength) { 1079 struct kernel_lb_addr loc = { 1080 .logicalBlockNum = le32_to_cpu( 1081 phd->unallocSpaceTable.extPosition), 1082 .partitionReferenceNum = p_index, 1083 }; 1084 struct inode *inode; 1085 1086 inode = udf_iget_special(sb, &loc); 1087 if (IS_ERR(inode)) { 1088 udf_debug("cannot load unallocSpaceTable (part %d)\n", 1089 p_index); 1090 return PTR_ERR(inode); 1091 } 1092 map->s_uspace.s_table = inode; 1093 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE; 1094 udf_debug("unallocSpaceTable (part %d) @ %lu\n", 1095 p_index, map->s_uspace.s_table->i_ino); 1096 } 1097 1098 if (phd->unallocSpaceBitmap.extLength) { 1099 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index); 1100 if (!bitmap) 1101 return -ENOMEM; 1102 map->s_uspace.s_bitmap = bitmap; 1103 bitmap->s_extPosition = le32_to_cpu( 1104 phd->unallocSpaceBitmap.extPosition); 1105 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP; 1106 udf_debug("unallocSpaceBitmap (part %d) @ %u\n", 1107 p_index, bitmap->s_extPosition); 1108 } 1109 1110 if (phd->partitionIntegrityTable.extLength) 1111 udf_debug("partitionIntegrityTable (part %d)\n", p_index); 1112 1113 if (phd->freedSpaceTable.extLength) { 1114 struct kernel_lb_addr loc = { 1115 .logicalBlockNum = le32_to_cpu( 1116 phd->freedSpaceTable.extPosition), 1117 .partitionReferenceNum = p_index, 1118 }; 1119 struct inode *inode; 1120 1121 inode = udf_iget_special(sb, &loc); 1122 if (IS_ERR(inode)) { 1123 udf_debug("cannot load freedSpaceTable (part %d)\n", 1124 p_index); 1125 return PTR_ERR(inode); 1126 } 1127 map->s_fspace.s_table = inode; 1128 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE; 1129 udf_debug("freedSpaceTable (part %d) @ %lu\n", 1130 p_index, map->s_fspace.s_table->i_ino); 1131 } 1132 1133 if (phd->freedSpaceBitmap.extLength) { 1134 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index); 1135 if (!bitmap) 1136 return -ENOMEM; 1137 map->s_fspace.s_bitmap = bitmap; 1138 bitmap->s_extPosition = le32_to_cpu( 1139 phd->freedSpaceBitmap.extPosition); 1140 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP; 1141 udf_debug("freedSpaceBitmap (part %d) @ %u\n", 1142 p_index, bitmap->s_extPosition); 1143 } 1144 return 0; 1145 } 1146 1147 static void udf_find_vat_block(struct super_block *sb, int p_index, 1148 int type1_index, sector_t start_block) 1149 { 1150 struct udf_sb_info *sbi = UDF_SB(sb); 1151 struct udf_part_map *map = &sbi->s_partmaps[p_index]; 1152 sector_t vat_block; 1153 struct kernel_lb_addr ino; 1154 struct inode *inode; 1155 1156 /* 1157 * VAT file entry is in the last recorded block. Some broken disks have 1158 * it a few blocks before so try a bit harder... 1159 */ 1160 ino.partitionReferenceNum = type1_index; 1161 for (vat_block = start_block; 1162 vat_block >= map->s_partition_root && 1163 vat_block >= start_block - 3; vat_block--) { 1164 ino.logicalBlockNum = vat_block - map->s_partition_root; 1165 inode = udf_iget_special(sb, &ino); 1166 if (!IS_ERR(inode)) { 1167 sbi->s_vat_inode = inode; 1168 break; 1169 } 1170 } 1171 } 1172 1173 static int udf_load_vat(struct super_block *sb, int p_index, int type1_index) 1174 { 1175 struct udf_sb_info *sbi = UDF_SB(sb); 1176 struct udf_part_map *map = &sbi->s_partmaps[p_index]; 1177 struct buffer_head *bh = NULL; 1178 struct udf_inode_info *vati; 1179 uint32_t pos; 1180 struct virtualAllocationTable20 *vat20; 1181 sector_t blocks = i_size_read(sb->s_bdev->bd_inode) >> 1182 sb->s_blocksize_bits; 1183 1184 udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block); 1185 if (!sbi->s_vat_inode && 1186 sbi->s_last_block != blocks - 1) { 1187 pr_notice("Failed to read VAT inode from the last recorded block (%lu), retrying with the last block of the device (%lu).\n", 1188 (unsigned long)sbi->s_last_block, 1189 (unsigned long)blocks - 1); 1190 udf_find_vat_block(sb, p_index, type1_index, blocks - 1); 1191 } 1192 if (!sbi->s_vat_inode) 1193 return -EIO; 1194 1195 if (map->s_partition_type == UDF_VIRTUAL_MAP15) { 1196 map->s_type_specific.s_virtual.s_start_offset = 0; 1197 map->s_type_specific.s_virtual.s_num_entries = 1198 (sbi->s_vat_inode->i_size - 36) >> 2; 1199 } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) { 1200 vati = UDF_I(sbi->s_vat_inode); 1201 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { 1202 pos = udf_block_map(sbi->s_vat_inode, 0); 1203 bh = sb_bread(sb, pos); 1204 if (!bh) 1205 return -EIO; 1206 vat20 = (struct virtualAllocationTable20 *)bh->b_data; 1207 } else { 1208 vat20 = (struct virtualAllocationTable20 *) 1209 vati->i_ext.i_data; 1210 } 1211 1212 map->s_type_specific.s_virtual.s_start_offset = 1213 le16_to_cpu(vat20->lengthHeader); 1214 map->s_type_specific.s_virtual.s_num_entries = 1215 (sbi->s_vat_inode->i_size - 1216 map->s_type_specific.s_virtual. 1217 s_start_offset) >> 2; 1218 brelse(bh); 1219 } 1220 return 0; 1221 } 1222 1223 /* 1224 * Load partition descriptor block 1225 * 1226 * Returns <0 on error, 0 on success, -EAGAIN is special - try next descriptor 1227 * sequence. 1228 */ 1229 static int udf_load_partdesc(struct super_block *sb, sector_t block) 1230 { 1231 struct buffer_head *bh; 1232 struct partitionDesc *p; 1233 struct udf_part_map *map; 1234 struct udf_sb_info *sbi = UDF_SB(sb); 1235 int i, type1_idx; 1236 uint16_t partitionNumber; 1237 uint16_t ident; 1238 int ret; 1239 1240 bh = udf_read_tagged(sb, block, block, &ident); 1241 if (!bh) 1242 return -EAGAIN; 1243 if (ident != TAG_IDENT_PD) { 1244 ret = 0; 1245 goto out_bh; 1246 } 1247 1248 p = (struct partitionDesc *)bh->b_data; 1249 partitionNumber = le16_to_cpu(p->partitionNumber); 1250 1251 /* First scan for TYPE1 and SPARABLE partitions */ 1252 for (i = 0; i < sbi->s_partitions; i++) { 1253 map = &sbi->s_partmaps[i]; 1254 udf_debug("Searching map: (%u == %u)\n", 1255 map->s_partition_num, partitionNumber); 1256 if (map->s_partition_num == partitionNumber && 1257 (map->s_partition_type == UDF_TYPE1_MAP15 || 1258 map->s_partition_type == UDF_SPARABLE_MAP15)) 1259 break; 1260 } 1261 1262 if (i >= sbi->s_partitions) { 1263 udf_debug("Partition (%u) not found in partition map\n", 1264 partitionNumber); 1265 ret = 0; 1266 goto out_bh; 1267 } 1268 1269 ret = udf_fill_partdesc_info(sb, p, i); 1270 if (ret < 0) 1271 goto out_bh; 1272 1273 /* 1274 * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and 1275 * PHYSICAL partitions are already set up 1276 */ 1277 type1_idx = i; 1278 #ifdef UDFFS_DEBUG 1279 map = NULL; /* supress 'maybe used uninitialized' warning */ 1280 #endif 1281 for (i = 0; i < sbi->s_partitions; i++) { 1282 map = &sbi->s_partmaps[i]; 1283 1284 if (map->s_partition_num == partitionNumber && 1285 (map->s_partition_type == UDF_VIRTUAL_MAP15 || 1286 map->s_partition_type == UDF_VIRTUAL_MAP20 || 1287 map->s_partition_type == UDF_METADATA_MAP25)) 1288 break; 1289 } 1290 1291 if (i >= sbi->s_partitions) { 1292 ret = 0; 1293 goto out_bh; 1294 } 1295 1296 ret = udf_fill_partdesc_info(sb, p, i); 1297 if (ret < 0) 1298 goto out_bh; 1299 1300 if (map->s_partition_type == UDF_METADATA_MAP25) { 1301 ret = udf_load_metadata_files(sb, i, type1_idx); 1302 if (ret < 0) { 1303 udf_err(sb, "error loading MetaData partition map %d\n", 1304 i); 1305 goto out_bh; 1306 } 1307 } else { 1308 /* 1309 * If we have a partition with virtual map, we don't handle 1310 * writing to it (we overwrite blocks instead of relocating 1311 * them). 1312 */ 1313 if (!sb_rdonly(sb)) { 1314 ret = -EACCES; 1315 goto out_bh; 1316 } 1317 ret = udf_load_vat(sb, i, type1_idx); 1318 if (ret < 0) 1319 goto out_bh; 1320 } 1321 ret = 0; 1322 out_bh: 1323 /* In case loading failed, we handle cleanup in udf_fill_super */ 1324 brelse(bh); 1325 return ret; 1326 } 1327 1328 static int udf_load_sparable_map(struct super_block *sb, 1329 struct udf_part_map *map, 1330 struct sparablePartitionMap *spm) 1331 { 1332 uint32_t loc; 1333 uint16_t ident; 1334 struct sparingTable *st; 1335 struct udf_sparing_data *sdata = &map->s_type_specific.s_sparing; 1336 int i; 1337 struct buffer_head *bh; 1338 1339 map->s_partition_type = UDF_SPARABLE_MAP15; 1340 sdata->s_packet_len = le16_to_cpu(spm->packetLength); 1341 if (!is_power_of_2(sdata->s_packet_len)) { 1342 udf_err(sb, "error loading logical volume descriptor: " 1343 "Invalid packet length %u\n", 1344 (unsigned)sdata->s_packet_len); 1345 return -EIO; 1346 } 1347 if (spm->numSparingTables > 4) { 1348 udf_err(sb, "error loading logical volume descriptor: " 1349 "Too many sparing tables (%d)\n", 1350 (int)spm->numSparingTables); 1351 return -EIO; 1352 } 1353 1354 for (i = 0; i < spm->numSparingTables; i++) { 1355 loc = le32_to_cpu(spm->locSparingTable[i]); 1356 bh = udf_read_tagged(sb, loc, loc, &ident); 1357 if (!bh) 1358 continue; 1359 1360 st = (struct sparingTable *)bh->b_data; 1361 if (ident != 0 || 1362 strncmp(st->sparingIdent.ident, UDF_ID_SPARING, 1363 strlen(UDF_ID_SPARING)) || 1364 sizeof(*st) + le16_to_cpu(st->reallocationTableLen) > 1365 sb->s_blocksize) { 1366 brelse(bh); 1367 continue; 1368 } 1369 1370 sdata->s_spar_map[i] = bh; 1371 } 1372 map->s_partition_func = udf_get_pblock_spar15; 1373 return 0; 1374 } 1375 1376 static int udf_load_logicalvol(struct super_block *sb, sector_t block, 1377 struct kernel_lb_addr *fileset) 1378 { 1379 struct logicalVolDesc *lvd; 1380 int i, offset; 1381 uint8_t type; 1382 struct udf_sb_info *sbi = UDF_SB(sb); 1383 struct genericPartitionMap *gpm; 1384 uint16_t ident; 1385 struct buffer_head *bh; 1386 unsigned int table_len; 1387 int ret; 1388 1389 bh = udf_read_tagged(sb, block, block, &ident); 1390 if (!bh) 1391 return -EAGAIN; 1392 BUG_ON(ident != TAG_IDENT_LVD); 1393 lvd = (struct logicalVolDesc *)bh->b_data; 1394 table_len = le32_to_cpu(lvd->mapTableLength); 1395 if (table_len > sb->s_blocksize - sizeof(*lvd)) { 1396 udf_err(sb, "error loading logical volume descriptor: " 1397 "Partition table too long (%u > %lu)\n", table_len, 1398 sb->s_blocksize - sizeof(*lvd)); 1399 ret = -EIO; 1400 goto out_bh; 1401 } 1402 1403 ret = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps)); 1404 if (ret) 1405 goto out_bh; 1406 1407 for (i = 0, offset = 0; 1408 i < sbi->s_partitions && offset < table_len; 1409 i++, offset += gpm->partitionMapLength) { 1410 struct udf_part_map *map = &sbi->s_partmaps[i]; 1411 gpm = (struct genericPartitionMap *) 1412 &(lvd->partitionMaps[offset]); 1413 type = gpm->partitionMapType; 1414 if (type == 1) { 1415 struct genericPartitionMap1 *gpm1 = 1416 (struct genericPartitionMap1 *)gpm; 1417 map->s_partition_type = UDF_TYPE1_MAP15; 1418 map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum); 1419 map->s_partition_num = le16_to_cpu(gpm1->partitionNum); 1420 map->s_partition_func = NULL; 1421 } else if (type == 2) { 1422 struct udfPartitionMap2 *upm2 = 1423 (struct udfPartitionMap2 *)gpm; 1424 if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL, 1425 strlen(UDF_ID_VIRTUAL))) { 1426 u16 suf = 1427 le16_to_cpu(((__le16 *)upm2->partIdent. 1428 identSuffix)[0]); 1429 if (suf < 0x0200) { 1430 map->s_partition_type = 1431 UDF_VIRTUAL_MAP15; 1432 map->s_partition_func = 1433 udf_get_pblock_virt15; 1434 } else { 1435 map->s_partition_type = 1436 UDF_VIRTUAL_MAP20; 1437 map->s_partition_func = 1438 udf_get_pblock_virt20; 1439 } 1440 } else if (!strncmp(upm2->partIdent.ident, 1441 UDF_ID_SPARABLE, 1442 strlen(UDF_ID_SPARABLE))) { 1443 ret = udf_load_sparable_map(sb, map, 1444 (struct sparablePartitionMap *)gpm); 1445 if (ret < 0) 1446 goto out_bh; 1447 } else if (!strncmp(upm2->partIdent.ident, 1448 UDF_ID_METADATA, 1449 strlen(UDF_ID_METADATA))) { 1450 struct udf_meta_data *mdata = 1451 &map->s_type_specific.s_metadata; 1452 struct metadataPartitionMap *mdm = 1453 (struct metadataPartitionMap *) 1454 &(lvd->partitionMaps[offset]); 1455 udf_debug("Parsing Logical vol part %d type %u id=%s\n", 1456 i, type, UDF_ID_METADATA); 1457 1458 map->s_partition_type = UDF_METADATA_MAP25; 1459 map->s_partition_func = udf_get_pblock_meta25; 1460 1461 mdata->s_meta_file_loc = 1462 le32_to_cpu(mdm->metadataFileLoc); 1463 mdata->s_mirror_file_loc = 1464 le32_to_cpu(mdm->metadataMirrorFileLoc); 1465 mdata->s_bitmap_file_loc = 1466 le32_to_cpu(mdm->metadataBitmapFileLoc); 1467 mdata->s_alloc_unit_size = 1468 le32_to_cpu(mdm->allocUnitSize); 1469 mdata->s_align_unit_size = 1470 le16_to_cpu(mdm->alignUnitSize); 1471 if (mdm->flags & 0x01) 1472 mdata->s_flags |= MF_DUPLICATE_MD; 1473 1474 udf_debug("Metadata Ident suffix=0x%x\n", 1475 le16_to_cpu(*(__le16 *) 1476 mdm->partIdent.identSuffix)); 1477 udf_debug("Metadata part num=%u\n", 1478 le16_to_cpu(mdm->partitionNum)); 1479 udf_debug("Metadata part alloc unit size=%u\n", 1480 le32_to_cpu(mdm->allocUnitSize)); 1481 udf_debug("Metadata file loc=%u\n", 1482 le32_to_cpu(mdm->metadataFileLoc)); 1483 udf_debug("Mirror file loc=%u\n", 1484 le32_to_cpu(mdm->metadataMirrorFileLoc)); 1485 udf_debug("Bitmap file loc=%u\n", 1486 le32_to_cpu(mdm->metadataBitmapFileLoc)); 1487 udf_debug("Flags: %d %u\n", 1488 mdata->s_flags, mdm->flags); 1489 } else { 1490 udf_debug("Unknown ident: %s\n", 1491 upm2->partIdent.ident); 1492 continue; 1493 } 1494 map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum); 1495 map->s_partition_num = le16_to_cpu(upm2->partitionNum); 1496 } 1497 udf_debug("Partition (%d:%u) type %u on volume %u\n", 1498 i, map->s_partition_num, type, map->s_volumeseqnum); 1499 } 1500 1501 if (fileset) { 1502 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]); 1503 1504 *fileset = lelb_to_cpu(la->extLocation); 1505 udf_debug("FileSet found in LogicalVolDesc at block=%u, partition=%u\n", 1506 fileset->logicalBlockNum, 1507 fileset->partitionReferenceNum); 1508 } 1509 if (lvd->integritySeqExt.extLength) 1510 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt)); 1511 ret = 0; 1512 out_bh: 1513 brelse(bh); 1514 return ret; 1515 } 1516 1517 /* 1518 * Find the prevailing Logical Volume Integrity Descriptor. 1519 */ 1520 static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc) 1521 { 1522 struct buffer_head *bh, *final_bh; 1523 uint16_t ident; 1524 struct udf_sb_info *sbi = UDF_SB(sb); 1525 struct logicalVolIntegrityDesc *lvid; 1526 int indirections = 0; 1527 1528 while (++indirections <= UDF_MAX_LVID_NESTING) { 1529 final_bh = NULL; 1530 while (loc.extLength > 0 && 1531 (bh = udf_read_tagged(sb, loc.extLocation, 1532 loc.extLocation, &ident))) { 1533 if (ident != TAG_IDENT_LVID) { 1534 brelse(bh); 1535 break; 1536 } 1537 1538 brelse(final_bh); 1539 final_bh = bh; 1540 1541 loc.extLength -= sb->s_blocksize; 1542 loc.extLocation++; 1543 } 1544 1545 if (!final_bh) 1546 return; 1547 1548 brelse(sbi->s_lvid_bh); 1549 sbi->s_lvid_bh = final_bh; 1550 1551 lvid = (struct logicalVolIntegrityDesc *)final_bh->b_data; 1552 if (lvid->nextIntegrityExt.extLength == 0) 1553 return; 1554 1555 loc = leea_to_cpu(lvid->nextIntegrityExt); 1556 } 1557 1558 udf_warn(sb, "Too many LVID indirections (max %u), ignoring.\n", 1559 UDF_MAX_LVID_NESTING); 1560 brelse(sbi->s_lvid_bh); 1561 sbi->s_lvid_bh = NULL; 1562 } 1563 1564 /* 1565 * Step for reallocation of table of partition descriptor sequence numbers. 1566 * Must be power of 2. 1567 */ 1568 #define PART_DESC_ALLOC_STEP 32 1569 1570 struct desc_seq_scan_data { 1571 struct udf_vds_record vds[VDS_POS_LENGTH]; 1572 unsigned int size_part_descs; 1573 struct udf_vds_record *part_descs_loc; 1574 }; 1575 1576 static struct udf_vds_record *handle_partition_descriptor( 1577 struct buffer_head *bh, 1578 struct desc_seq_scan_data *data) 1579 { 1580 struct partitionDesc *desc = (struct partitionDesc *)bh->b_data; 1581 int partnum; 1582 1583 partnum = le16_to_cpu(desc->partitionNumber); 1584 if (partnum >= data->size_part_descs) { 1585 struct udf_vds_record *new_loc; 1586 unsigned int new_size = ALIGN(partnum, PART_DESC_ALLOC_STEP); 1587 1588 new_loc = kzalloc(sizeof(*new_loc) * new_size, GFP_KERNEL); 1589 if (!new_loc) 1590 return ERR_PTR(-ENOMEM); 1591 memcpy(new_loc, data->part_descs_loc, 1592 data->size_part_descs * sizeof(*new_loc)); 1593 kfree(data->part_descs_loc); 1594 data->part_descs_loc = new_loc; 1595 data->size_part_descs = new_size; 1596 } 1597 return &(data->part_descs_loc[partnum]); 1598 } 1599 1600 1601 static struct udf_vds_record *get_volume_descriptor_record(uint16_t ident, 1602 struct buffer_head *bh, struct desc_seq_scan_data *data) 1603 { 1604 switch (ident) { 1605 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */ 1606 return &(data->vds[VDS_POS_PRIMARY_VOL_DESC]); 1607 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */ 1608 return &(data->vds[VDS_POS_IMP_USE_VOL_DESC]); 1609 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */ 1610 return &(data->vds[VDS_POS_LOGICAL_VOL_DESC]); 1611 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */ 1612 return &(data->vds[VDS_POS_UNALLOC_SPACE_DESC]); 1613 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */ 1614 return handle_partition_descriptor(bh, data); 1615 } 1616 return NULL; 1617 } 1618 1619 /* 1620 * Process a main/reserve volume descriptor sequence. 1621 * @block First block of first extent of the sequence. 1622 * @lastblock Lastblock of first extent of the sequence. 1623 * @fileset There we store extent containing root fileset 1624 * 1625 * Returns <0 on error, 0 on success. -EAGAIN is special - try next descriptor 1626 * sequence 1627 */ 1628 static noinline int udf_process_sequence( 1629 struct super_block *sb, 1630 sector_t block, sector_t lastblock, 1631 struct kernel_lb_addr *fileset) 1632 { 1633 struct buffer_head *bh = NULL; 1634 struct udf_vds_record *curr; 1635 struct generic_desc *gd; 1636 struct volDescPtr *vdp; 1637 bool done = false; 1638 uint32_t vdsn; 1639 uint16_t ident; 1640 int ret; 1641 unsigned int indirections = 0; 1642 struct desc_seq_scan_data data; 1643 unsigned int i; 1644 1645 memset(data.vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH); 1646 data.size_part_descs = PART_DESC_ALLOC_STEP; 1647 data.part_descs_loc = kzalloc(sizeof(*data.part_descs_loc) * 1648 data.size_part_descs, GFP_KERNEL); 1649 if (!data.part_descs_loc) 1650 return -ENOMEM; 1651 1652 /* 1653 * Read the main descriptor sequence and find which descriptors 1654 * are in it. 1655 */ 1656 for (; (!done && block <= lastblock); block++) { 1657 1658 bh = udf_read_tagged(sb, block, block, &ident); 1659 if (!bh) 1660 break; 1661 1662 /* Process each descriptor (ISO 13346 3/8.3-8.4) */ 1663 gd = (struct generic_desc *)bh->b_data; 1664 vdsn = le32_to_cpu(gd->volDescSeqNum); 1665 switch (ident) { 1666 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */ 1667 if (++indirections > UDF_MAX_TD_NESTING) { 1668 udf_err(sb, "too many Volume Descriptor " 1669 "Pointers (max %u supported)\n", 1670 UDF_MAX_TD_NESTING); 1671 brelse(bh); 1672 return -EIO; 1673 } 1674 1675 vdp = (struct volDescPtr *)bh->b_data; 1676 block = le32_to_cpu(vdp->nextVolDescSeqExt.extLocation); 1677 lastblock = le32_to_cpu( 1678 vdp->nextVolDescSeqExt.extLength) >> 1679 sb->s_blocksize_bits; 1680 lastblock += block - 1; 1681 /* For loop is going to increment 'block' again */ 1682 block--; 1683 break; 1684 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */ 1685 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */ 1686 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */ 1687 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */ 1688 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */ 1689 curr = get_volume_descriptor_record(ident, bh, &data); 1690 if (IS_ERR(curr)) { 1691 brelse(bh); 1692 return PTR_ERR(curr); 1693 } 1694 /* Descriptor we don't care about? */ 1695 if (!curr) 1696 break; 1697 if (vdsn >= curr->volDescSeqNum) { 1698 curr->volDescSeqNum = vdsn; 1699 curr->block = block; 1700 } 1701 break; 1702 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */ 1703 done = true; 1704 break; 1705 } 1706 brelse(bh); 1707 } 1708 /* 1709 * Now read interesting descriptors again and process them 1710 * in a suitable order 1711 */ 1712 if (!data.vds[VDS_POS_PRIMARY_VOL_DESC].block) { 1713 udf_err(sb, "Primary Volume Descriptor not found!\n"); 1714 return -EAGAIN; 1715 } 1716 ret = udf_load_pvoldesc(sb, data.vds[VDS_POS_PRIMARY_VOL_DESC].block); 1717 if (ret < 0) 1718 return ret; 1719 1720 if (data.vds[VDS_POS_LOGICAL_VOL_DESC].block) { 1721 ret = udf_load_logicalvol(sb, 1722 data.vds[VDS_POS_LOGICAL_VOL_DESC].block, 1723 fileset); 1724 if (ret < 0) 1725 return ret; 1726 } 1727 1728 /* Now handle prevailing Partition Descriptors */ 1729 for (i = 0; i < data.size_part_descs; i++) { 1730 if (data.part_descs_loc[i].block) { 1731 ret = udf_load_partdesc(sb, 1732 data.part_descs_loc[i].block); 1733 if (ret < 0) 1734 return ret; 1735 } 1736 } 1737 1738 return 0; 1739 } 1740 1741 /* 1742 * Load Volume Descriptor Sequence described by anchor in bh 1743 * 1744 * Returns <0 on error, 0 on success 1745 */ 1746 static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh, 1747 struct kernel_lb_addr *fileset) 1748 { 1749 struct anchorVolDescPtr *anchor; 1750 sector_t main_s, main_e, reserve_s, reserve_e; 1751 int ret; 1752 1753 anchor = (struct anchorVolDescPtr *)bh->b_data; 1754 1755 /* Locate the main sequence */ 1756 main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation); 1757 main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength); 1758 main_e = main_e >> sb->s_blocksize_bits; 1759 main_e += main_s - 1; 1760 1761 /* Locate the reserve sequence */ 1762 reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation); 1763 reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength); 1764 reserve_e = reserve_e >> sb->s_blocksize_bits; 1765 reserve_e += reserve_s - 1; 1766 1767 /* Process the main & reserve sequences */ 1768 /* responsible for finding the PartitionDesc(s) */ 1769 ret = udf_process_sequence(sb, main_s, main_e, fileset); 1770 if (ret != -EAGAIN) 1771 return ret; 1772 udf_sb_free_partitions(sb); 1773 ret = udf_process_sequence(sb, reserve_s, reserve_e, fileset); 1774 if (ret < 0) { 1775 udf_sb_free_partitions(sb); 1776 /* No sequence was OK, return -EIO */ 1777 if (ret == -EAGAIN) 1778 ret = -EIO; 1779 } 1780 return ret; 1781 } 1782 1783 /* 1784 * Check whether there is an anchor block in the given block and 1785 * load Volume Descriptor Sequence if so. 1786 * 1787 * Returns <0 on error, 0 on success, -EAGAIN is special - try next anchor 1788 * block 1789 */ 1790 static int udf_check_anchor_block(struct super_block *sb, sector_t block, 1791 struct kernel_lb_addr *fileset) 1792 { 1793 struct buffer_head *bh; 1794 uint16_t ident; 1795 int ret; 1796 1797 if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) && 1798 udf_fixed_to_variable(block) >= 1799 i_size_read(sb->s_bdev->bd_inode) >> sb->s_blocksize_bits) 1800 return -EAGAIN; 1801 1802 bh = udf_read_tagged(sb, block, block, &ident); 1803 if (!bh) 1804 return -EAGAIN; 1805 if (ident != TAG_IDENT_AVDP) { 1806 brelse(bh); 1807 return -EAGAIN; 1808 } 1809 ret = udf_load_sequence(sb, bh, fileset); 1810 brelse(bh); 1811 return ret; 1812 } 1813 1814 /* 1815 * Search for an anchor volume descriptor pointer. 1816 * 1817 * Returns < 0 on error, 0 on success. -EAGAIN is special - try next set 1818 * of anchors. 1819 */ 1820 static int udf_scan_anchors(struct super_block *sb, sector_t *lastblock, 1821 struct kernel_lb_addr *fileset) 1822 { 1823 sector_t last[6]; 1824 int i; 1825 struct udf_sb_info *sbi = UDF_SB(sb); 1826 int last_count = 0; 1827 int ret; 1828 1829 /* First try user provided anchor */ 1830 if (sbi->s_anchor) { 1831 ret = udf_check_anchor_block(sb, sbi->s_anchor, fileset); 1832 if (ret != -EAGAIN) 1833 return ret; 1834 } 1835 /* 1836 * according to spec, anchor is in either: 1837 * block 256 1838 * lastblock-256 1839 * lastblock 1840 * however, if the disc isn't closed, it could be 512. 1841 */ 1842 ret = udf_check_anchor_block(sb, sbi->s_session + 256, fileset); 1843 if (ret != -EAGAIN) 1844 return ret; 1845 /* 1846 * The trouble is which block is the last one. Drives often misreport 1847 * this so we try various possibilities. 1848 */ 1849 last[last_count++] = *lastblock; 1850 if (*lastblock >= 1) 1851 last[last_count++] = *lastblock - 1; 1852 last[last_count++] = *lastblock + 1; 1853 if (*lastblock >= 2) 1854 last[last_count++] = *lastblock - 2; 1855 if (*lastblock >= 150) 1856 last[last_count++] = *lastblock - 150; 1857 if (*lastblock >= 152) 1858 last[last_count++] = *lastblock - 152; 1859 1860 for (i = 0; i < last_count; i++) { 1861 if (last[i] >= i_size_read(sb->s_bdev->bd_inode) >> 1862 sb->s_blocksize_bits) 1863 continue; 1864 ret = udf_check_anchor_block(sb, last[i], fileset); 1865 if (ret != -EAGAIN) { 1866 if (!ret) 1867 *lastblock = last[i]; 1868 return ret; 1869 } 1870 if (last[i] < 256) 1871 continue; 1872 ret = udf_check_anchor_block(sb, last[i] - 256, fileset); 1873 if (ret != -EAGAIN) { 1874 if (!ret) 1875 *lastblock = last[i]; 1876 return ret; 1877 } 1878 } 1879 1880 /* Finally try block 512 in case media is open */ 1881 return udf_check_anchor_block(sb, sbi->s_session + 512, fileset); 1882 } 1883 1884 /* 1885 * Find an anchor volume descriptor and load Volume Descriptor Sequence from 1886 * area specified by it. The function expects sbi->s_lastblock to be the last 1887 * block on the media. 1888 * 1889 * Return <0 on error, 0 if anchor found. -EAGAIN is special meaning anchor 1890 * was not found. 1891 */ 1892 static int udf_find_anchor(struct super_block *sb, 1893 struct kernel_lb_addr *fileset) 1894 { 1895 struct udf_sb_info *sbi = UDF_SB(sb); 1896 sector_t lastblock = sbi->s_last_block; 1897 int ret; 1898 1899 ret = udf_scan_anchors(sb, &lastblock, fileset); 1900 if (ret != -EAGAIN) 1901 goto out; 1902 1903 /* No anchor found? Try VARCONV conversion of block numbers */ 1904 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV); 1905 lastblock = udf_variable_to_fixed(sbi->s_last_block); 1906 /* Firstly, we try to not convert number of the last block */ 1907 ret = udf_scan_anchors(sb, &lastblock, fileset); 1908 if (ret != -EAGAIN) 1909 goto out; 1910 1911 lastblock = sbi->s_last_block; 1912 /* Secondly, we try with converted number of the last block */ 1913 ret = udf_scan_anchors(sb, &lastblock, fileset); 1914 if (ret < 0) { 1915 /* VARCONV didn't help. Clear it. */ 1916 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV); 1917 } 1918 out: 1919 if (ret == 0) 1920 sbi->s_last_block = lastblock; 1921 return ret; 1922 } 1923 1924 /* 1925 * Check Volume Structure Descriptor, find Anchor block and load Volume 1926 * Descriptor Sequence. 1927 * 1928 * Returns < 0 on error, 0 on success. -EAGAIN is special meaning anchor 1929 * block was not found. 1930 */ 1931 static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt, 1932 int silent, struct kernel_lb_addr *fileset) 1933 { 1934 struct udf_sb_info *sbi = UDF_SB(sb); 1935 loff_t nsr_off; 1936 int ret; 1937 1938 if (!sb_set_blocksize(sb, uopt->blocksize)) { 1939 if (!silent) 1940 udf_warn(sb, "Bad block size\n"); 1941 return -EINVAL; 1942 } 1943 sbi->s_last_block = uopt->lastblock; 1944 if (!uopt->novrs) { 1945 /* Check that it is NSR02 compliant */ 1946 nsr_off = udf_check_vsd(sb); 1947 if (!nsr_off) { 1948 if (!silent) 1949 udf_warn(sb, "No VRS found\n"); 1950 return -EINVAL; 1951 } 1952 if (nsr_off == -1) 1953 udf_debug("Failed to read sector at offset %d. " 1954 "Assuming open disc. Skipping validity " 1955 "check\n", VSD_FIRST_SECTOR_OFFSET); 1956 if (!sbi->s_last_block) 1957 sbi->s_last_block = udf_get_last_block(sb); 1958 } else { 1959 udf_debug("Validity check skipped because of novrs option\n"); 1960 } 1961 1962 /* Look for anchor block and load Volume Descriptor Sequence */ 1963 sbi->s_anchor = uopt->anchor; 1964 ret = udf_find_anchor(sb, fileset); 1965 if (ret < 0) { 1966 if (!silent && ret == -EAGAIN) 1967 udf_warn(sb, "No anchor found\n"); 1968 return ret; 1969 } 1970 return 0; 1971 } 1972 1973 static void udf_open_lvid(struct super_block *sb) 1974 { 1975 struct udf_sb_info *sbi = UDF_SB(sb); 1976 struct buffer_head *bh = sbi->s_lvid_bh; 1977 struct logicalVolIntegrityDesc *lvid; 1978 struct logicalVolIntegrityDescImpUse *lvidiu; 1979 struct timespec ts; 1980 1981 if (!bh) 1982 return; 1983 lvid = (struct logicalVolIntegrityDesc *)bh->b_data; 1984 lvidiu = udf_sb_lvidiu(sb); 1985 if (!lvidiu) 1986 return; 1987 1988 mutex_lock(&sbi->s_alloc_mutex); 1989 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX; 1990 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX; 1991 ktime_get_real_ts(&ts); 1992 udf_time_to_disk_stamp(&lvid->recordingDateAndTime, ts); 1993 if (le32_to_cpu(lvid->integrityType) == LVID_INTEGRITY_TYPE_CLOSE) 1994 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN); 1995 else 1996 UDF_SET_FLAG(sb, UDF_FLAG_INCONSISTENT); 1997 1998 lvid->descTag.descCRC = cpu_to_le16( 1999 crc_itu_t(0, (char *)lvid + sizeof(struct tag), 2000 le16_to_cpu(lvid->descTag.descCRCLength))); 2001 2002 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag); 2003 mark_buffer_dirty(bh); 2004 sbi->s_lvid_dirty = 0; 2005 mutex_unlock(&sbi->s_alloc_mutex); 2006 /* Make opening of filesystem visible on the media immediately */ 2007 sync_dirty_buffer(bh); 2008 } 2009 2010 static void udf_close_lvid(struct super_block *sb) 2011 { 2012 struct udf_sb_info *sbi = UDF_SB(sb); 2013 struct buffer_head *bh = sbi->s_lvid_bh; 2014 struct logicalVolIntegrityDesc *lvid; 2015 struct logicalVolIntegrityDescImpUse *lvidiu; 2016 struct timespec ts; 2017 2018 if (!bh) 2019 return; 2020 lvid = (struct logicalVolIntegrityDesc *)bh->b_data; 2021 lvidiu = udf_sb_lvidiu(sb); 2022 if (!lvidiu) 2023 return; 2024 2025 mutex_lock(&sbi->s_alloc_mutex); 2026 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX; 2027 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX; 2028 ktime_get_real_ts(&ts); 2029 udf_time_to_disk_stamp(&lvid->recordingDateAndTime, ts); 2030 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev)) 2031 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION); 2032 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev)) 2033 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev); 2034 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev)) 2035 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev); 2036 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_INCONSISTENT)) 2037 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE); 2038 2039 lvid->descTag.descCRC = cpu_to_le16( 2040 crc_itu_t(0, (char *)lvid + sizeof(struct tag), 2041 le16_to_cpu(lvid->descTag.descCRCLength))); 2042 2043 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag); 2044 /* 2045 * We set buffer uptodate unconditionally here to avoid spurious 2046 * warnings from mark_buffer_dirty() when previous EIO has marked 2047 * the buffer as !uptodate 2048 */ 2049 set_buffer_uptodate(bh); 2050 mark_buffer_dirty(bh); 2051 sbi->s_lvid_dirty = 0; 2052 mutex_unlock(&sbi->s_alloc_mutex); 2053 /* Make closing of filesystem visible on the media immediately */ 2054 sync_dirty_buffer(bh); 2055 } 2056 2057 u64 lvid_get_unique_id(struct super_block *sb) 2058 { 2059 struct buffer_head *bh; 2060 struct udf_sb_info *sbi = UDF_SB(sb); 2061 struct logicalVolIntegrityDesc *lvid; 2062 struct logicalVolHeaderDesc *lvhd; 2063 u64 uniqueID; 2064 u64 ret; 2065 2066 bh = sbi->s_lvid_bh; 2067 if (!bh) 2068 return 0; 2069 2070 lvid = (struct logicalVolIntegrityDesc *)bh->b_data; 2071 lvhd = (struct logicalVolHeaderDesc *)lvid->logicalVolContentsUse; 2072 2073 mutex_lock(&sbi->s_alloc_mutex); 2074 ret = uniqueID = le64_to_cpu(lvhd->uniqueID); 2075 if (!(++uniqueID & 0xFFFFFFFF)) 2076 uniqueID += 16; 2077 lvhd->uniqueID = cpu_to_le64(uniqueID); 2078 mutex_unlock(&sbi->s_alloc_mutex); 2079 mark_buffer_dirty(bh); 2080 2081 return ret; 2082 } 2083 2084 static int udf_fill_super(struct super_block *sb, void *options, int silent) 2085 { 2086 int ret = -EINVAL; 2087 struct inode *inode = NULL; 2088 struct udf_options uopt; 2089 struct kernel_lb_addr rootdir, fileset; 2090 struct udf_sb_info *sbi; 2091 bool lvid_open = false; 2092 2093 uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT); 2094 /* By default we'll use overflow[ug]id when UDF inode [ug]id == -1 */ 2095 uopt.uid = make_kuid(current_user_ns(), overflowuid); 2096 uopt.gid = make_kgid(current_user_ns(), overflowgid); 2097 uopt.umask = 0; 2098 uopt.fmode = UDF_INVALID_MODE; 2099 uopt.dmode = UDF_INVALID_MODE; 2100 uopt.nls_map = NULL; 2101 2102 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 2103 if (!sbi) 2104 return -ENOMEM; 2105 2106 sb->s_fs_info = sbi; 2107 2108 mutex_init(&sbi->s_alloc_mutex); 2109 2110 if (!udf_parse_options((char *)options, &uopt, false)) 2111 goto parse_options_failure; 2112 2113 if (uopt.flags & (1 << UDF_FLAG_UTF8) && 2114 uopt.flags & (1 << UDF_FLAG_NLS_MAP)) { 2115 udf_err(sb, "utf8 cannot be combined with iocharset\n"); 2116 goto parse_options_failure; 2117 } 2118 if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) { 2119 uopt.nls_map = load_nls_default(); 2120 if (!uopt.nls_map) 2121 uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP); 2122 else 2123 udf_debug("Using default NLS map\n"); 2124 } 2125 if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP))) 2126 uopt.flags |= (1 << UDF_FLAG_UTF8); 2127 2128 fileset.logicalBlockNum = 0xFFFFFFFF; 2129 fileset.partitionReferenceNum = 0xFFFF; 2130 2131 sbi->s_flags = uopt.flags; 2132 sbi->s_uid = uopt.uid; 2133 sbi->s_gid = uopt.gid; 2134 sbi->s_umask = uopt.umask; 2135 sbi->s_fmode = uopt.fmode; 2136 sbi->s_dmode = uopt.dmode; 2137 sbi->s_nls_map = uopt.nls_map; 2138 rwlock_init(&sbi->s_cred_lock); 2139 2140 if (uopt.session == 0xFFFFFFFF) 2141 sbi->s_session = udf_get_last_session(sb); 2142 else 2143 sbi->s_session = uopt.session; 2144 2145 udf_debug("Multi-session=%d\n", sbi->s_session); 2146 2147 /* Fill in the rest of the superblock */ 2148 sb->s_op = &udf_sb_ops; 2149 sb->s_export_op = &udf_export_ops; 2150 2151 sb->s_magic = UDF_SUPER_MAGIC; 2152 sb->s_time_gran = 1000; 2153 2154 if (uopt.flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) { 2155 ret = udf_load_vrs(sb, &uopt, silent, &fileset); 2156 } else { 2157 uopt.blocksize = bdev_logical_block_size(sb->s_bdev); 2158 while (uopt.blocksize <= 4096) { 2159 ret = udf_load_vrs(sb, &uopt, silent, &fileset); 2160 if (ret < 0) { 2161 if (!silent && ret != -EACCES) { 2162 pr_notice("Scanning with blocksize %u failed\n", 2163 uopt.blocksize); 2164 } 2165 brelse(sbi->s_lvid_bh); 2166 sbi->s_lvid_bh = NULL; 2167 /* 2168 * EACCES is special - we want to propagate to 2169 * upper layers that we cannot handle RW mount. 2170 */ 2171 if (ret == -EACCES) 2172 break; 2173 } else 2174 break; 2175 2176 uopt.blocksize <<= 1; 2177 } 2178 } 2179 if (ret < 0) { 2180 if (ret == -EAGAIN) { 2181 udf_warn(sb, "No partition found (1)\n"); 2182 ret = -EINVAL; 2183 } 2184 goto error_out; 2185 } 2186 2187 udf_debug("Lastblock=%u\n", sbi->s_last_block); 2188 2189 if (sbi->s_lvid_bh) { 2190 struct logicalVolIntegrityDescImpUse *lvidiu = 2191 udf_sb_lvidiu(sb); 2192 uint16_t minUDFReadRev; 2193 uint16_t minUDFWriteRev; 2194 2195 if (!lvidiu) { 2196 ret = -EINVAL; 2197 goto error_out; 2198 } 2199 minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev); 2200 minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev); 2201 if (minUDFReadRev > UDF_MAX_READ_VERSION) { 2202 udf_err(sb, "minUDFReadRev=%x (max is %x)\n", 2203 minUDFReadRev, 2204 UDF_MAX_READ_VERSION); 2205 ret = -EINVAL; 2206 goto error_out; 2207 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION && 2208 !sb_rdonly(sb)) { 2209 ret = -EACCES; 2210 goto error_out; 2211 } 2212 2213 sbi->s_udfrev = minUDFWriteRev; 2214 2215 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE) 2216 UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE); 2217 if (minUDFReadRev >= UDF_VERS_USE_STREAMS) 2218 UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS); 2219 } 2220 2221 if (!sbi->s_partitions) { 2222 udf_warn(sb, "No partition found (2)\n"); 2223 ret = -EINVAL; 2224 goto error_out; 2225 } 2226 2227 if (sbi->s_partmaps[sbi->s_partition].s_partition_flags & 2228 UDF_PART_FLAG_READ_ONLY && 2229 !sb_rdonly(sb)) { 2230 ret = -EACCES; 2231 goto error_out; 2232 } 2233 2234 if (udf_find_fileset(sb, &fileset, &rootdir)) { 2235 udf_warn(sb, "No fileset found\n"); 2236 ret = -EINVAL; 2237 goto error_out; 2238 } 2239 2240 if (!silent) { 2241 struct timestamp ts; 2242 udf_time_to_disk_stamp(&ts, sbi->s_record_time); 2243 udf_info("Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n", 2244 sbi->s_volume_ident, 2245 le16_to_cpu(ts.year), ts.month, ts.day, 2246 ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone)); 2247 } 2248 if (!sb_rdonly(sb)) { 2249 udf_open_lvid(sb); 2250 lvid_open = true; 2251 } 2252 2253 /* Assign the root inode */ 2254 /* assign inodes by physical block number */ 2255 /* perhaps it's not extensible enough, but for now ... */ 2256 inode = udf_iget(sb, &rootdir); 2257 if (IS_ERR(inode)) { 2258 udf_err(sb, "Error in udf_iget, block=%u, partition=%u\n", 2259 rootdir.logicalBlockNum, rootdir.partitionReferenceNum); 2260 ret = PTR_ERR(inode); 2261 goto error_out; 2262 } 2263 2264 /* Allocate a dentry for the root inode */ 2265 sb->s_root = d_make_root(inode); 2266 if (!sb->s_root) { 2267 udf_err(sb, "Couldn't allocate root dentry\n"); 2268 ret = -ENOMEM; 2269 goto error_out; 2270 } 2271 sb->s_maxbytes = MAX_LFS_FILESIZE; 2272 sb->s_max_links = UDF_MAX_LINKS; 2273 return 0; 2274 2275 error_out: 2276 iput(sbi->s_vat_inode); 2277 parse_options_failure: 2278 if (uopt.nls_map) 2279 unload_nls(uopt.nls_map); 2280 if (lvid_open) 2281 udf_close_lvid(sb); 2282 brelse(sbi->s_lvid_bh); 2283 udf_sb_free_partitions(sb); 2284 kfree(sbi); 2285 sb->s_fs_info = NULL; 2286 2287 return ret; 2288 } 2289 2290 void _udf_err(struct super_block *sb, const char *function, 2291 const char *fmt, ...) 2292 { 2293 struct va_format vaf; 2294 va_list args; 2295 2296 va_start(args, fmt); 2297 2298 vaf.fmt = fmt; 2299 vaf.va = &args; 2300 2301 pr_err("error (device %s): %s: %pV", sb->s_id, function, &vaf); 2302 2303 va_end(args); 2304 } 2305 2306 void _udf_warn(struct super_block *sb, const char *function, 2307 const char *fmt, ...) 2308 { 2309 struct va_format vaf; 2310 va_list args; 2311 2312 va_start(args, fmt); 2313 2314 vaf.fmt = fmt; 2315 vaf.va = &args; 2316 2317 pr_warn("warning (device %s): %s: %pV", sb->s_id, function, &vaf); 2318 2319 va_end(args); 2320 } 2321 2322 static void udf_put_super(struct super_block *sb) 2323 { 2324 struct udf_sb_info *sbi; 2325 2326 sbi = UDF_SB(sb); 2327 2328 iput(sbi->s_vat_inode); 2329 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP)) 2330 unload_nls(sbi->s_nls_map); 2331 if (!sb_rdonly(sb)) 2332 udf_close_lvid(sb); 2333 brelse(sbi->s_lvid_bh); 2334 udf_sb_free_partitions(sb); 2335 mutex_destroy(&sbi->s_alloc_mutex); 2336 kfree(sb->s_fs_info); 2337 sb->s_fs_info = NULL; 2338 } 2339 2340 static int udf_sync_fs(struct super_block *sb, int wait) 2341 { 2342 struct udf_sb_info *sbi = UDF_SB(sb); 2343 2344 mutex_lock(&sbi->s_alloc_mutex); 2345 if (sbi->s_lvid_dirty) { 2346 /* 2347 * Blockdevice will be synced later so we don't have to submit 2348 * the buffer for IO 2349 */ 2350 mark_buffer_dirty(sbi->s_lvid_bh); 2351 sbi->s_lvid_dirty = 0; 2352 } 2353 mutex_unlock(&sbi->s_alloc_mutex); 2354 2355 return 0; 2356 } 2357 2358 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf) 2359 { 2360 struct super_block *sb = dentry->d_sb; 2361 struct udf_sb_info *sbi = UDF_SB(sb); 2362 struct logicalVolIntegrityDescImpUse *lvidiu; 2363 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 2364 2365 lvidiu = udf_sb_lvidiu(sb); 2366 buf->f_type = UDF_SUPER_MAGIC; 2367 buf->f_bsize = sb->s_blocksize; 2368 buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len; 2369 buf->f_bfree = udf_count_free(sb); 2370 buf->f_bavail = buf->f_bfree; 2371 buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) + 2372 le32_to_cpu(lvidiu->numDirs)) : 0) 2373 + buf->f_bfree; 2374 buf->f_ffree = buf->f_bfree; 2375 buf->f_namelen = UDF_NAME_LEN; 2376 buf->f_fsid.val[0] = (u32)id; 2377 buf->f_fsid.val[1] = (u32)(id >> 32); 2378 2379 return 0; 2380 } 2381 2382 static unsigned int udf_count_free_bitmap(struct super_block *sb, 2383 struct udf_bitmap *bitmap) 2384 { 2385 struct buffer_head *bh = NULL; 2386 unsigned int accum = 0; 2387 int index; 2388 udf_pblk_t block = 0, newblock; 2389 struct kernel_lb_addr loc; 2390 uint32_t bytes; 2391 uint8_t *ptr; 2392 uint16_t ident; 2393 struct spaceBitmapDesc *bm; 2394 2395 loc.logicalBlockNum = bitmap->s_extPosition; 2396 loc.partitionReferenceNum = UDF_SB(sb)->s_partition; 2397 bh = udf_read_ptagged(sb, &loc, 0, &ident); 2398 2399 if (!bh) { 2400 udf_err(sb, "udf_count_free failed\n"); 2401 goto out; 2402 } else if (ident != TAG_IDENT_SBD) { 2403 brelse(bh); 2404 udf_err(sb, "udf_count_free failed\n"); 2405 goto out; 2406 } 2407 2408 bm = (struct spaceBitmapDesc *)bh->b_data; 2409 bytes = le32_to_cpu(bm->numOfBytes); 2410 index = sizeof(struct spaceBitmapDesc); /* offset in first block only */ 2411 ptr = (uint8_t *)bh->b_data; 2412 2413 while (bytes > 0) { 2414 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index); 2415 accum += bitmap_weight((const unsigned long *)(ptr + index), 2416 cur_bytes * 8); 2417 bytes -= cur_bytes; 2418 if (bytes) { 2419 brelse(bh); 2420 newblock = udf_get_lb_pblock(sb, &loc, ++block); 2421 bh = udf_tread(sb, newblock); 2422 if (!bh) { 2423 udf_debug("read failed\n"); 2424 goto out; 2425 } 2426 index = 0; 2427 ptr = (uint8_t *)bh->b_data; 2428 } 2429 } 2430 brelse(bh); 2431 out: 2432 return accum; 2433 } 2434 2435 static unsigned int udf_count_free_table(struct super_block *sb, 2436 struct inode *table) 2437 { 2438 unsigned int accum = 0; 2439 uint32_t elen; 2440 struct kernel_lb_addr eloc; 2441 int8_t etype; 2442 struct extent_position epos; 2443 2444 mutex_lock(&UDF_SB(sb)->s_alloc_mutex); 2445 epos.block = UDF_I(table)->i_location; 2446 epos.offset = sizeof(struct unallocSpaceEntry); 2447 epos.bh = NULL; 2448 2449 while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1) 2450 accum += (elen >> table->i_sb->s_blocksize_bits); 2451 2452 brelse(epos.bh); 2453 mutex_unlock(&UDF_SB(sb)->s_alloc_mutex); 2454 2455 return accum; 2456 } 2457 2458 static unsigned int udf_count_free(struct super_block *sb) 2459 { 2460 unsigned int accum = 0; 2461 struct udf_sb_info *sbi; 2462 struct udf_part_map *map; 2463 2464 sbi = UDF_SB(sb); 2465 if (sbi->s_lvid_bh) { 2466 struct logicalVolIntegrityDesc *lvid = 2467 (struct logicalVolIntegrityDesc *) 2468 sbi->s_lvid_bh->b_data; 2469 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) { 2470 accum = le32_to_cpu( 2471 lvid->freeSpaceTable[sbi->s_partition]); 2472 if (accum == 0xFFFFFFFF) 2473 accum = 0; 2474 } 2475 } 2476 2477 if (accum) 2478 return accum; 2479 2480 map = &sbi->s_partmaps[sbi->s_partition]; 2481 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) { 2482 accum += udf_count_free_bitmap(sb, 2483 map->s_uspace.s_bitmap); 2484 } 2485 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) { 2486 accum += udf_count_free_bitmap(sb, 2487 map->s_fspace.s_bitmap); 2488 } 2489 if (accum) 2490 return accum; 2491 2492 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) { 2493 accum += udf_count_free_table(sb, 2494 map->s_uspace.s_table); 2495 } 2496 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) { 2497 accum += udf_count_free_table(sb, 2498 map->s_fspace.s_table); 2499 } 2500 2501 return accum; 2502 } 2503 2504 MODULE_AUTHOR("Ben Fennema"); 2505 MODULE_DESCRIPTION("Universal Disk Format Filesystem"); 2506 MODULE_LICENSE("GPL"); 2507 module_init(init_udf_fs) 2508 module_exit(exit_udf_fs) 2509