1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * super.c 4 * 5 * PURPOSE 6 * Super block routines for the OSTA-UDF(tm) filesystem. 7 * 8 * DESCRIPTION 9 * OSTA-UDF(tm) = Optical Storage Technology Association 10 * Universal Disk Format. 11 * 12 * This code is based on version 2.00 of the UDF specification, 13 * and revision 3 of the ECMA 167 standard [equivalent to ISO 13346]. 14 * http://www.osta.org/ 15 * https://www.ecma.ch/ 16 * https://www.iso.org/ 17 * 18 * COPYRIGHT 19 * (C) 1998 Dave Boynton 20 * (C) 1998-2004 Ben Fennema 21 * (C) 2000 Stelias Computing Inc 22 * 23 * HISTORY 24 * 25 * 09/24/98 dgb changed to allow compiling outside of kernel, and 26 * added some debugging. 27 * 10/01/98 dgb updated to allow (some) possibility of compiling w/2.0.34 28 * 10/16/98 attempting some multi-session support 29 * 10/17/98 added freespace count for "df" 30 * 11/11/98 gr added novrs option 31 * 11/26/98 dgb added fileset,anchor mount options 32 * 12/06/98 blf really hosed things royally. vat/sparing support. sequenced 33 * vol descs. rewrote option handling based on isofs 34 * 12/20/98 find the free space bitmap (if it exists) 35 */ 36 37 #include "udfdecl.h" 38 39 #include <linux/blkdev.h> 40 #include <linux/slab.h> 41 #include <linux/kernel.h> 42 #include <linux/module.h> 43 #include <linux/stat.h> 44 #include <linux/cdrom.h> 45 #include <linux/nls.h> 46 #include <linux/vfs.h> 47 #include <linux/vmalloc.h> 48 #include <linux/errno.h> 49 #include <linux/seq_file.h> 50 #include <linux/bitmap.h> 51 #include <linux/crc-itu-t.h> 52 #include <linux/log2.h> 53 #include <asm/byteorder.h> 54 #include <linux/iversion.h> 55 #include <linux/fs_context.h> 56 #include <linux/fs_parser.h> 57 58 #include "udf_sb.h" 59 #include "udf_i.h" 60 61 #include <linux/init.h> 62 #include <linux/uaccess.h> 63 64 enum { 65 VDS_POS_PRIMARY_VOL_DESC, 66 VDS_POS_UNALLOC_SPACE_DESC, 67 VDS_POS_LOGICAL_VOL_DESC, 68 VDS_POS_IMP_USE_VOL_DESC, 69 VDS_POS_LENGTH 70 }; 71 72 #define VSD_FIRST_SECTOR_OFFSET 32768 73 #define VSD_MAX_SECTOR_OFFSET 0x800000 74 75 /* 76 * Maximum number of Terminating Descriptor / Logical Volume Integrity 77 * Descriptor redirections. The chosen numbers are arbitrary - just that we 78 * hopefully don't limit any real use of rewritten inode on write-once media 79 * but avoid looping for too long on corrupted media. 80 */ 81 #define UDF_MAX_TD_NESTING 64 82 #define UDF_MAX_LVID_NESTING 1000 83 84 enum { UDF_MAX_LINKS = 0xffff }; 85 /* 86 * We limit filesize to 4TB. This is arbitrary as the on-disk format supports 87 * more but because the file space is described by a linked list of extents, 88 * each of which can have at most 1GB, the creation and handling of extents 89 * gets unusably slow beyond certain point... 90 */ 91 #define UDF_MAX_FILESIZE (1ULL << 42) 92 93 /* These are the "meat" - everything else is stuffing */ 94 static int udf_fill_super(struct super_block *sb, struct fs_context *fc); 95 static void udf_put_super(struct super_block *); 96 static int udf_sync_fs(struct super_block *, int); 97 static void udf_load_logicalvolint(struct super_block *, struct kernel_extent_ad); 98 static void udf_open_lvid(struct super_block *); 99 static void udf_close_lvid(struct super_block *); 100 static unsigned int udf_count_free(struct super_block *); 101 static int udf_statfs(struct dentry *, struct kstatfs *); 102 static int udf_show_options(struct seq_file *, struct dentry *); 103 static int udf_init_fs_context(struct fs_context *fc); 104 static int udf_parse_param(struct fs_context *fc, struct fs_parameter *param); 105 static int udf_reconfigure(struct fs_context *fc); 106 static void udf_free_fc(struct fs_context *fc); 107 static const struct fs_parameter_spec udf_param_spec[]; 108 109 struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct super_block *sb) 110 { 111 struct logicalVolIntegrityDesc *lvid; 112 unsigned int partnum; 113 unsigned int offset; 114 115 if (!UDF_SB(sb)->s_lvid_bh) 116 return NULL; 117 lvid = (struct logicalVolIntegrityDesc *)UDF_SB(sb)->s_lvid_bh->b_data; 118 partnum = le32_to_cpu(lvid->numOfPartitions); 119 /* The offset is to skip freeSpaceTable and sizeTable arrays */ 120 offset = partnum * 2 * sizeof(uint32_t); 121 return (struct logicalVolIntegrityDescImpUse *) 122 (((uint8_t *)(lvid + 1)) + offset); 123 } 124 125 /* UDF filesystem type */ 126 static int udf_get_tree(struct fs_context *fc) 127 { 128 return get_tree_bdev(fc, udf_fill_super); 129 } 130 131 static const struct fs_context_operations udf_context_ops = { 132 .parse_param = udf_parse_param, 133 .get_tree = udf_get_tree, 134 .reconfigure = udf_reconfigure, 135 .free = udf_free_fc, 136 }; 137 138 static struct file_system_type udf_fstype = { 139 .owner = THIS_MODULE, 140 .name = "udf", 141 .kill_sb = kill_block_super, 142 .fs_flags = FS_REQUIRES_DEV, 143 .init_fs_context = udf_init_fs_context, 144 .parameters = udf_param_spec, 145 }; 146 MODULE_ALIAS_FS("udf"); 147 148 static struct kmem_cache *udf_inode_cachep; 149 150 static struct inode *udf_alloc_inode(struct super_block *sb) 151 { 152 struct udf_inode_info *ei; 153 ei = alloc_inode_sb(sb, udf_inode_cachep, GFP_KERNEL); 154 if (!ei) 155 return NULL; 156 157 ei->i_unique = 0; 158 ei->i_lenExtents = 0; 159 ei->i_lenStreams = 0; 160 ei->i_next_alloc_block = 0; 161 ei->i_next_alloc_goal = 0; 162 ei->i_strat4096 = 0; 163 ei->i_streamdir = 0; 164 ei->i_hidden = 0; 165 init_rwsem(&ei->i_data_sem); 166 ei->cached_extent.lstart = -1; 167 spin_lock_init(&ei->i_extent_cache_lock); 168 inode_set_iversion(&ei->vfs_inode, 1); 169 mmb_init(&ei->i_metadata_bhs, &ei->vfs_inode.i_data); 170 171 return &ei->vfs_inode; 172 } 173 174 static void udf_free_in_core_inode(struct inode *inode) 175 { 176 kmem_cache_free(udf_inode_cachep, UDF_I(inode)); 177 } 178 179 static void init_once(void *foo) 180 { 181 struct udf_inode_info *ei = foo; 182 183 ei->i_data = NULL; 184 inode_init_once(&ei->vfs_inode); 185 } 186 187 static int __init init_inodecache(void) 188 { 189 udf_inode_cachep = kmem_cache_create("udf_inode_cache", 190 sizeof(struct udf_inode_info), 191 0, (SLAB_RECLAIM_ACCOUNT | 192 SLAB_ACCOUNT), 193 init_once); 194 if (!udf_inode_cachep) 195 return -ENOMEM; 196 return 0; 197 } 198 199 static void destroy_inodecache(void) 200 { 201 /* 202 * Make sure all delayed rcu free inodes are flushed before we 203 * destroy cache. 204 */ 205 rcu_barrier(); 206 kmem_cache_destroy(udf_inode_cachep); 207 } 208 209 /* Superblock operations */ 210 static const struct super_operations udf_sb_ops = { 211 .alloc_inode = udf_alloc_inode, 212 .free_inode = udf_free_in_core_inode, 213 .write_inode = udf_write_inode, 214 .evict_inode = udf_evict_inode, 215 .put_super = udf_put_super, 216 .sync_fs = udf_sync_fs, 217 .statfs = udf_statfs, 218 .show_options = udf_show_options, 219 }; 220 221 struct udf_options { 222 unsigned int blocksize; 223 unsigned int session; 224 unsigned int lastblock; 225 unsigned int anchor; 226 unsigned int flags; 227 umode_t umask; 228 kgid_t gid; 229 kuid_t uid; 230 umode_t fmode; 231 umode_t dmode; 232 struct nls_table *nls_map; 233 }; 234 235 /* 236 * UDF has historically preserved prior mount options across 237 * a remount, so copy those here if remounting, otherwise set 238 * initial mount defaults. 239 */ 240 static void udf_init_options(struct fs_context *fc, struct udf_options *uopt) 241 { 242 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) { 243 struct super_block *sb = fc->root->d_sb; 244 struct udf_sb_info *sbi = UDF_SB(sb); 245 246 uopt->flags = sbi->s_flags; 247 uopt->uid = sbi->s_uid; 248 uopt->gid = sbi->s_gid; 249 uopt->umask = sbi->s_umask; 250 uopt->fmode = sbi->s_fmode; 251 uopt->dmode = sbi->s_dmode; 252 uopt->nls_map = NULL; 253 } else { 254 uopt->flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | 255 (1 << UDF_FLAG_STRICT); 256 /* 257 * By default we'll use overflow[ug]id when UDF 258 * inode [ug]id == -1 259 */ 260 uopt->uid = make_kuid(current_user_ns(), overflowuid); 261 uopt->gid = make_kgid(current_user_ns(), overflowgid); 262 uopt->umask = 0; 263 uopt->fmode = UDF_INVALID_MODE; 264 uopt->dmode = UDF_INVALID_MODE; 265 uopt->nls_map = NULL; 266 uopt->session = 0xFFFFFFFF; 267 } 268 } 269 270 static int udf_init_fs_context(struct fs_context *fc) 271 { 272 struct udf_options *uopt; 273 274 uopt = kzalloc_obj(*uopt); 275 if (!uopt) 276 return -ENOMEM; 277 278 udf_init_options(fc, uopt); 279 280 fc->fs_private = uopt; 281 fc->ops = &udf_context_ops; 282 283 return 0; 284 } 285 286 static void udf_free_fc(struct fs_context *fc) 287 { 288 struct udf_options *uopt = fc->fs_private; 289 290 unload_nls(uopt->nls_map); 291 kfree(fc->fs_private); 292 } 293 294 static int __init init_udf_fs(void) 295 { 296 int err; 297 298 err = init_inodecache(); 299 if (err) 300 goto out1; 301 err = register_filesystem(&udf_fstype); 302 if (err) 303 goto out; 304 305 return 0; 306 307 out: 308 destroy_inodecache(); 309 310 out1: 311 return err; 312 } 313 314 static void __exit exit_udf_fs(void) 315 { 316 unregister_filesystem(&udf_fstype); 317 destroy_inodecache(); 318 } 319 320 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count) 321 { 322 struct udf_sb_info *sbi = UDF_SB(sb); 323 324 sbi->s_partmaps = kzalloc_objs(*sbi->s_partmaps, count); 325 if (!sbi->s_partmaps) { 326 sbi->s_partitions = 0; 327 return -ENOMEM; 328 } 329 330 sbi->s_partitions = count; 331 return 0; 332 } 333 334 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap) 335 { 336 int i; 337 int nr_groups = bitmap->s_nr_groups; 338 339 for (i = 0; i < nr_groups; i++) 340 if (!IS_ERR_OR_NULL(bitmap->s_block_bitmap[i])) 341 brelse(bitmap->s_block_bitmap[i]); 342 343 kvfree(bitmap); 344 } 345 346 static void udf_free_partition(struct udf_part_map *map) 347 { 348 int i; 349 struct udf_meta_data *mdata; 350 351 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) 352 iput(map->s_uspace.s_table); 353 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) 354 udf_sb_free_bitmap(map->s_uspace.s_bitmap); 355 if (map->s_partition_type == UDF_SPARABLE_MAP15) 356 for (i = 0; i < 4; i++) 357 brelse(map->s_type_specific.s_sparing.s_spar_map[i]); 358 else if (map->s_partition_type == UDF_METADATA_MAP25) { 359 mdata = &map->s_type_specific.s_metadata; 360 iput(mdata->s_metadata_fe); 361 mdata->s_metadata_fe = NULL; 362 363 iput(mdata->s_mirror_fe); 364 mdata->s_mirror_fe = NULL; 365 366 iput(mdata->s_bitmap_fe); 367 mdata->s_bitmap_fe = NULL; 368 } 369 } 370 371 static void udf_sb_free_partitions(struct super_block *sb) 372 { 373 struct udf_sb_info *sbi = UDF_SB(sb); 374 int i; 375 376 if (!sbi->s_partmaps) 377 return; 378 for (i = 0; i < sbi->s_partitions; i++) 379 udf_free_partition(&sbi->s_partmaps[i]); 380 kfree(sbi->s_partmaps); 381 sbi->s_partmaps = NULL; 382 } 383 384 static int udf_show_options(struct seq_file *seq, struct dentry *root) 385 { 386 struct super_block *sb = root->d_sb; 387 struct udf_sb_info *sbi = UDF_SB(sb); 388 389 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT)) 390 seq_puts(seq, ",nostrict"); 391 if (UDF_QUERY_FLAG(sb, UDF_FLAG_BLOCKSIZE_SET)) 392 seq_printf(seq, ",bs=%lu", sb->s_blocksize); 393 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE)) 394 seq_puts(seq, ",unhide"); 395 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE)) 396 seq_puts(seq, ",undelete"); 397 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB)) 398 seq_puts(seq, ",noadinicb"); 399 if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD)) 400 seq_puts(seq, ",shortad"); 401 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET)) 402 seq_puts(seq, ",uid=forget"); 403 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET)) 404 seq_puts(seq, ",gid=forget"); 405 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET)) 406 seq_printf(seq, ",uid=%u", from_kuid(&init_user_ns, sbi->s_uid)); 407 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET)) 408 seq_printf(seq, ",gid=%u", from_kgid(&init_user_ns, sbi->s_gid)); 409 if (sbi->s_umask != 0) 410 seq_printf(seq, ",umask=%ho", sbi->s_umask); 411 if (sbi->s_fmode != UDF_INVALID_MODE) 412 seq_printf(seq, ",mode=%ho", sbi->s_fmode); 413 if (sbi->s_dmode != UDF_INVALID_MODE) 414 seq_printf(seq, ",dmode=%ho", sbi->s_dmode); 415 if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET)) 416 seq_printf(seq, ",session=%d", sbi->s_session); 417 if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET)) 418 seq_printf(seq, ",lastblock=%u", sbi->s_last_block); 419 if (sbi->s_anchor != 0) 420 seq_printf(seq, ",anchor=%u", sbi->s_anchor); 421 if (sbi->s_nls_map) 422 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset); 423 else 424 seq_puts(seq, ",iocharset=utf8"); 425 426 return 0; 427 } 428 429 /* 430 * udf_parse_param 431 * 432 * PURPOSE 433 * Parse mount options. 434 * 435 * DESCRIPTION 436 * The following mount options are supported: 437 * 438 * gid= Set the default group. 439 * umask= Set the default umask. 440 * mode= Set the default file permissions. 441 * dmode= Set the default directory permissions. 442 * uid= Set the default user. 443 * bs= Set the block size. 444 * unhide Show otherwise hidden files. 445 * undelete Show deleted files in lists. 446 * adinicb Embed data in the inode (default) 447 * noadinicb Don't embed data in the inode 448 * shortad Use short ad's 449 * longad Use long ad's (default) 450 * nostrict Unset strict conformance 451 * iocharset= Set the NLS character set 452 * 453 * The remaining are for debugging and disaster recovery: 454 * 455 * novrs Skip volume sequence recognition 456 * 457 * The following expect a offset from 0. 458 * 459 * session= Set the CDROM session (default= last session) 460 * anchor= Override standard anchor location. (default= 256) 461 * volume= Override the VolumeDesc location. (unused) 462 * partition= Override the PartitionDesc location. (unused) 463 * lastblock= Set the last block of the filesystem/ 464 * 465 * The following expect a offset from the partition root. 466 * 467 * fileset= Override the fileset block location. (unused) 468 * rootdir= Override the root directory location. (unused) 469 * WARNING: overriding the rootdir to a non-directory may 470 * yield highly unpredictable results. 471 * 472 * PRE-CONDITIONS 473 * fc fs_context with pointer to mount options variable. 474 * param Pointer to fs_parameter being parsed. 475 * 476 * POST-CONDITIONS 477 * <return> 0 Mount options parsed okay. 478 * <return> errno Error parsing mount options. 479 * 480 * HISTORY 481 * July 1, 1997 - Andrew E. Mileski 482 * Written, tested, and released. 483 */ 484 485 enum { 486 Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete, 487 Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad, 488 Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock, 489 Opt_anchor, Opt_volume, Opt_partition, Opt_fileset, 490 Opt_rootdir, Opt_utf8, Opt_iocharset, Opt_err, Opt_fmode, Opt_dmode 491 }; 492 493 static const struct fs_parameter_spec udf_param_spec[] = { 494 fsparam_flag ("novrs", Opt_novrs), 495 fsparam_flag ("nostrict", Opt_nostrict), 496 fsparam_u32 ("bs", Opt_bs), 497 fsparam_flag ("unhide", Opt_unhide), 498 fsparam_flag ("undelete", Opt_undelete), 499 fsparam_flag_no ("adinicb", Opt_adinicb), 500 fsparam_flag ("shortad", Opt_shortad), 501 fsparam_flag ("longad", Opt_longad), 502 fsparam_string ("gid", Opt_gid), 503 fsparam_string ("uid", Opt_uid), 504 fsparam_u32 ("umask", Opt_umask), 505 fsparam_u32 ("session", Opt_session), 506 fsparam_u32 ("lastblock", Opt_lastblock), 507 fsparam_u32 ("anchor", Opt_anchor), 508 fsparam_u32 ("volume", Opt_volume), 509 fsparam_u32 ("partition", Opt_partition), 510 fsparam_u32 ("fileset", Opt_fileset), 511 fsparam_u32 ("rootdir", Opt_rootdir), 512 fsparam_flag ("utf8", Opt_utf8), 513 fsparam_string ("iocharset", Opt_iocharset), 514 fsparam_u32 ("mode", Opt_fmode), 515 fsparam_u32 ("dmode", Opt_dmode), 516 {} 517 }; 518 519 static int udf_parse_param(struct fs_context *fc, struct fs_parameter *param) 520 { 521 unsigned int uv; 522 unsigned int n; 523 struct udf_options *uopt = fc->fs_private; 524 struct fs_parse_result result; 525 int token; 526 bool remount = (fc->purpose & FS_CONTEXT_FOR_RECONFIGURE); 527 528 token = fs_parse(fc, udf_param_spec, param, &result); 529 if (token < 0) 530 return token; 531 532 switch (token) { 533 case Opt_novrs: 534 uopt->flags |= (1 << UDF_FLAG_NOVRS); 535 break; 536 case Opt_bs: 537 n = result.uint_32; 538 if (n != 512 && n != 1024 && n != 2048 && n != 4096) 539 return -EINVAL; 540 uopt->blocksize = n; 541 uopt->flags |= (1 << UDF_FLAG_BLOCKSIZE_SET); 542 break; 543 case Opt_unhide: 544 uopt->flags |= (1 << UDF_FLAG_UNHIDE); 545 break; 546 case Opt_undelete: 547 uopt->flags |= (1 << UDF_FLAG_UNDELETE); 548 break; 549 case Opt_adinicb: 550 if (result.negated) 551 uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB); 552 else 553 uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB); 554 break; 555 case Opt_shortad: 556 uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD); 557 break; 558 case Opt_longad: 559 uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD); 560 break; 561 case Opt_gid: 562 if (kstrtoint(param->string, 10, &uv) == 0) { 563 kgid_t gid = make_kgid(current_user_ns(), uv); 564 if (!gid_valid(gid)) 565 return -EINVAL; 566 uopt->gid = gid; 567 uopt->flags |= (1 << UDF_FLAG_GID_SET); 568 } else if (!strcmp(param->string, "forget")) { 569 uopt->flags |= (1 << UDF_FLAG_GID_FORGET); 570 } else if (!strcmp(param->string, "ignore")) { 571 /* this option is superseded by gid=<number> */ 572 ; 573 } else { 574 return -EINVAL; 575 } 576 break; 577 case Opt_uid: 578 if (kstrtoint(param->string, 10, &uv) == 0) { 579 kuid_t uid = make_kuid(current_user_ns(), uv); 580 if (!uid_valid(uid)) 581 return -EINVAL; 582 uopt->uid = uid; 583 uopt->flags |= (1 << UDF_FLAG_UID_SET); 584 } else if (!strcmp(param->string, "forget")) { 585 uopt->flags |= (1 << UDF_FLAG_UID_FORGET); 586 } else if (!strcmp(param->string, "ignore")) { 587 /* this option is superseded by uid=<number> */ 588 ; 589 } else { 590 return -EINVAL; 591 } 592 break; 593 case Opt_umask: 594 uopt->umask = result.uint_32; 595 break; 596 case Opt_nostrict: 597 uopt->flags &= ~(1 << UDF_FLAG_STRICT); 598 break; 599 case Opt_session: 600 uopt->session = result.uint_32; 601 if (!remount) 602 uopt->flags |= (1 << UDF_FLAG_SESSION_SET); 603 break; 604 case Opt_lastblock: 605 uopt->lastblock = result.uint_32; 606 if (!remount) 607 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET); 608 break; 609 case Opt_anchor: 610 uopt->anchor = result.uint_32; 611 break; 612 case Opt_volume: 613 case Opt_partition: 614 case Opt_fileset: 615 case Opt_rootdir: 616 /* Ignored (never implemented properly) */ 617 break; 618 case Opt_utf8: 619 if (!remount) { 620 unload_nls(uopt->nls_map); 621 uopt->nls_map = NULL; 622 } 623 break; 624 case Opt_iocharset: 625 if (!remount) { 626 unload_nls(uopt->nls_map); 627 uopt->nls_map = NULL; 628 } 629 /* When nls_map is not loaded then UTF-8 is used */ 630 if (!remount && strcmp(param->string, "utf8") != 0) { 631 uopt->nls_map = load_nls(param->string); 632 if (!uopt->nls_map) { 633 errorf(fc, "iocharset %s not found", 634 param->string); 635 return -EINVAL; 636 } 637 } 638 break; 639 case Opt_fmode: 640 uopt->fmode = result.uint_32 & 0777; 641 break; 642 case Opt_dmode: 643 uopt->dmode = result.uint_32 & 0777; 644 break; 645 default: 646 return -EINVAL; 647 } 648 return 0; 649 } 650 651 static int udf_reconfigure(struct fs_context *fc) 652 { 653 struct udf_options *uopt = fc->fs_private; 654 struct super_block *sb = fc->root->d_sb; 655 struct udf_sb_info *sbi = UDF_SB(sb); 656 int readonly = fc->sb_flags & SB_RDONLY; 657 int error = 0; 658 659 if (!readonly && UDF_QUERY_FLAG(sb, UDF_FLAG_RW_INCOMPAT)) 660 return -EACCES; 661 662 sync_filesystem(sb); 663 664 write_lock(&sbi->s_cred_lock); 665 sbi->s_flags = uopt->flags; 666 sbi->s_uid = uopt->uid; 667 sbi->s_gid = uopt->gid; 668 sbi->s_umask = uopt->umask; 669 sbi->s_fmode = uopt->fmode; 670 sbi->s_dmode = uopt->dmode; 671 write_unlock(&sbi->s_cred_lock); 672 673 if (readonly == sb_rdonly(sb)) 674 goto out_unlock; 675 676 if (readonly) 677 udf_close_lvid(sb); 678 else 679 udf_open_lvid(sb); 680 681 out_unlock: 682 return error; 683 } 684 685 /* 686 * Check VSD descriptor. Returns -1 in case we are at the end of volume 687 * recognition area, 0 if the descriptor is valid but non-interesting, 1 if 688 * we found one of NSR descriptors we are looking for. 689 */ 690 static int identify_vsd(const struct volStructDesc *vsd) 691 { 692 int ret = 0; 693 694 if (!memcmp(vsd->stdIdent, VSD_STD_ID_CD001, VSD_STD_ID_LEN)) { 695 switch (vsd->structType) { 696 case 0: 697 udf_debug("ISO9660 Boot Record found\n"); 698 break; 699 case 1: 700 udf_debug("ISO9660 Primary Volume Descriptor found\n"); 701 break; 702 case 2: 703 udf_debug("ISO9660 Supplementary Volume Descriptor found\n"); 704 break; 705 case 3: 706 udf_debug("ISO9660 Volume Partition Descriptor found\n"); 707 break; 708 case 255: 709 udf_debug("ISO9660 Volume Descriptor Set Terminator found\n"); 710 break; 711 default: 712 udf_debug("ISO9660 VRS (%u) found\n", vsd->structType); 713 break; 714 } 715 } else if (!memcmp(vsd->stdIdent, VSD_STD_ID_BEA01, VSD_STD_ID_LEN)) 716 ; /* ret = 0 */ 717 else if (!memcmp(vsd->stdIdent, VSD_STD_ID_NSR02, VSD_STD_ID_LEN)) 718 ret = 1; 719 else if (!memcmp(vsd->stdIdent, VSD_STD_ID_NSR03, VSD_STD_ID_LEN)) 720 ret = 1; 721 else if (!memcmp(vsd->stdIdent, VSD_STD_ID_BOOT2, VSD_STD_ID_LEN)) 722 ; /* ret = 0 */ 723 else if (!memcmp(vsd->stdIdent, VSD_STD_ID_CDW02, VSD_STD_ID_LEN)) 724 ; /* ret = 0 */ 725 else { 726 /* TEA01 or invalid id : end of volume recognition area */ 727 ret = -1; 728 } 729 730 return ret; 731 } 732 733 /* 734 * Check Volume Structure Descriptors (ECMA 167 2/9.1) 735 * We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) 736 * @return 1 if NSR02 or NSR03 found, 737 * -1 if first sector read error, 0 otherwise 738 */ 739 static int udf_check_vsd(struct super_block *sb) 740 { 741 struct volStructDesc *vsd = NULL; 742 loff_t sector = VSD_FIRST_SECTOR_OFFSET; 743 int sectorsize; 744 struct buffer_head *bh = NULL; 745 int nsr = 0; 746 struct udf_sb_info *sbi; 747 loff_t session_offset; 748 749 sbi = UDF_SB(sb); 750 if (sb->s_blocksize < sizeof(struct volStructDesc)) 751 sectorsize = sizeof(struct volStructDesc); 752 else 753 sectorsize = sb->s_blocksize; 754 755 session_offset = (loff_t)sbi->s_session << sb->s_blocksize_bits; 756 sector += session_offset; 757 758 udf_debug("Starting at sector %u (%lu byte sectors)\n", 759 (unsigned int)(sector >> sb->s_blocksize_bits), 760 sb->s_blocksize); 761 /* Process the sequence (if applicable). The hard limit on the sector 762 * offset is arbitrary, hopefully large enough so that all valid UDF 763 * filesystems will be recognised. There is no mention of an upper 764 * bound to the size of the volume recognition area in the standard. 765 * The limit will prevent the code to read all the sectors of a 766 * specially crafted image (like a bluray disc full of CD001 sectors), 767 * potentially causing minutes or even hours of uninterruptible I/O 768 * activity. This actually happened with uninitialised SSD partitions 769 * (all 0xFF) before the check for the limit and all valid IDs were 770 * added */ 771 for (; !nsr && sector < VSD_MAX_SECTOR_OFFSET; sector += sectorsize) { 772 /* Read a block */ 773 bh = sb_bread(sb, sector >> sb->s_blocksize_bits); 774 if (!bh) 775 break; 776 777 vsd = (struct volStructDesc *)(bh->b_data + 778 (sector & (sb->s_blocksize - 1))); 779 nsr = identify_vsd(vsd); 780 /* Found NSR or end? */ 781 if (nsr) { 782 brelse(bh); 783 break; 784 } 785 /* 786 * Special handling for improperly formatted VRS (e.g., Win10) 787 * where components are separated by 2048 bytes even though 788 * sectors are 4K 789 */ 790 if (sb->s_blocksize == 4096) { 791 nsr = identify_vsd(vsd + 1); 792 /* Ignore unknown IDs... */ 793 if (nsr < 0) 794 nsr = 0; 795 } 796 brelse(bh); 797 } 798 799 if (nsr > 0) 800 return 1; 801 else if (!bh && sector - session_offset == VSD_FIRST_SECTOR_OFFSET) 802 return -1; 803 else 804 return 0; 805 } 806 807 static int udf_verify_domain_identifier(struct super_block *sb, 808 struct regid *ident, char *dname) 809 { 810 struct domainIdentSuffix *suffix; 811 812 if (memcmp(ident->ident, UDF_ID_COMPLIANT, strlen(UDF_ID_COMPLIANT))) { 813 udf_warn(sb, "Not OSTA UDF compliant %s descriptor.\n", dname); 814 goto force_ro; 815 } 816 if (ident->flags & ENTITYID_FLAGS_DIRTY) { 817 udf_warn(sb, "Possibly not OSTA UDF compliant %s descriptor.\n", 818 dname); 819 goto force_ro; 820 } 821 suffix = (struct domainIdentSuffix *)ident->identSuffix; 822 if ((suffix->domainFlags & DOMAIN_FLAGS_HARD_WRITE_PROTECT) || 823 (suffix->domainFlags & DOMAIN_FLAGS_SOFT_WRITE_PROTECT)) { 824 if (!sb_rdonly(sb)) { 825 udf_warn(sb, "Descriptor for %s marked write protected." 826 " Forcing read only mount.\n", dname); 827 } 828 goto force_ro; 829 } 830 return 0; 831 832 force_ro: 833 if (!sb_rdonly(sb)) 834 return -EACCES; 835 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT); 836 return 0; 837 } 838 839 static int udf_load_fileset(struct super_block *sb, struct fileSetDesc *fset, 840 struct kernel_lb_addr *root) 841 { 842 int ret; 843 844 ret = udf_verify_domain_identifier(sb, &fset->domainIdent, "file set"); 845 if (ret < 0) 846 return ret; 847 848 *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation); 849 UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum); 850 851 udf_debug("Rootdir at block=%u, partition=%u\n", 852 root->logicalBlockNum, root->partitionReferenceNum); 853 return 0; 854 } 855 856 static int udf_find_fileset(struct super_block *sb, 857 struct kernel_lb_addr *fileset, 858 struct kernel_lb_addr *root) 859 { 860 struct buffer_head *bh; 861 uint16_t ident; 862 int ret; 863 864 if (fileset->logicalBlockNum == 0xFFFFFFFF && 865 fileset->partitionReferenceNum == 0xFFFF) 866 return -EINVAL; 867 868 bh = udf_read_ptagged(sb, fileset, 0, &ident); 869 if (!bh) 870 return -EIO; 871 if (ident != TAG_IDENT_FSD) { 872 brelse(bh); 873 return -EINVAL; 874 } 875 876 udf_debug("Fileset at block=%u, partition=%u\n", 877 fileset->logicalBlockNum, fileset->partitionReferenceNum); 878 879 UDF_SB(sb)->s_partition = fileset->partitionReferenceNum; 880 ret = udf_load_fileset(sb, (struct fileSetDesc *)bh->b_data, root); 881 brelse(bh); 882 return ret; 883 } 884 885 /* 886 * Load primary Volume Descriptor Sequence 887 * 888 * Return <0 on error, 0 on success. -EAGAIN is special meaning next sequence 889 * should be tried. 890 */ 891 static int udf_load_pvoldesc(struct super_block *sb, sector_t block) 892 { 893 struct primaryVolDesc *pvoldesc; 894 uint8_t *outstr; 895 struct buffer_head *bh; 896 uint16_t ident; 897 int ret; 898 struct timestamp *ts; 899 900 outstr = kzalloc(128, GFP_KERNEL); 901 if (!outstr) 902 return -ENOMEM; 903 904 bh = udf_read_tagged(sb, block, block, &ident); 905 if (!bh) { 906 ret = -EAGAIN; 907 goto out2; 908 } 909 910 if (ident != TAG_IDENT_PVD) { 911 ret = -EIO; 912 goto out_bh; 913 } 914 915 pvoldesc = (struct primaryVolDesc *)bh->b_data; 916 917 udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time, 918 pvoldesc->recordingDateAndTime); 919 ts = &pvoldesc->recordingDateAndTime; 920 udf_debug("recording time %04u/%02u/%02u %02u:%02u (%x)\n", 921 le16_to_cpu(ts->year), ts->month, ts->day, ts->hour, 922 ts->minute, le16_to_cpu(ts->typeAndTimezone)); 923 924 ret = udf_dstrCS0toChar(sb, outstr, 31, pvoldesc->volIdent, 32); 925 if (ret < 0) { 926 strscpy_pad(UDF_SB(sb)->s_volume_ident, "InvalidName"); 927 pr_warn("incorrect volume identification, setting to " 928 "'InvalidName'\n"); 929 } else { 930 strscpy_pad(UDF_SB(sb)->s_volume_ident, outstr); 931 } 932 udf_debug("volIdent[] = '%s'\n", UDF_SB(sb)->s_volume_ident); 933 934 ret = udf_dstrCS0toChar(sb, outstr, 127, pvoldesc->volSetIdent, 128); 935 if (ret < 0) { 936 ret = 0; 937 goto out_bh; 938 } 939 outstr[ret] = 0; 940 udf_debug("volSetIdent[] = '%s'\n", outstr); 941 942 ret = 0; 943 out_bh: 944 brelse(bh); 945 out2: 946 kfree(outstr); 947 return ret; 948 } 949 950 struct inode *udf_find_metadata_inode_efe(struct super_block *sb, 951 u32 meta_file_loc, u32 partition_ref) 952 { 953 struct kernel_lb_addr addr; 954 struct inode *metadata_fe; 955 956 addr.logicalBlockNum = meta_file_loc; 957 addr.partitionReferenceNum = partition_ref; 958 959 metadata_fe = udf_iget_special(sb, &addr); 960 961 if (IS_ERR(metadata_fe)) { 962 udf_warn(sb, "metadata inode efe not found\n"); 963 return metadata_fe; 964 } 965 if (UDF_I(metadata_fe)->i_alloc_type != ICBTAG_FLAG_AD_SHORT) { 966 udf_warn(sb, "metadata inode efe does not have short allocation descriptors!\n"); 967 iput(metadata_fe); 968 return ERR_PTR(-EIO); 969 } 970 971 return metadata_fe; 972 } 973 974 static int udf_load_metadata_files(struct super_block *sb, int partition, 975 int type1_index) 976 { 977 struct udf_sb_info *sbi = UDF_SB(sb); 978 struct udf_part_map *map; 979 struct udf_meta_data *mdata; 980 struct kernel_lb_addr addr; 981 struct inode *fe; 982 983 map = &sbi->s_partmaps[partition]; 984 mdata = &map->s_type_specific.s_metadata; 985 mdata->s_phys_partition_ref = type1_index; 986 987 /* metadata address */ 988 udf_debug("Metadata file location: block = %u part = %u\n", 989 mdata->s_meta_file_loc, mdata->s_phys_partition_ref); 990 991 fe = udf_find_metadata_inode_efe(sb, mdata->s_meta_file_loc, 992 mdata->s_phys_partition_ref); 993 if (IS_ERR(fe)) { 994 /* mirror file entry */ 995 udf_debug("Mirror metadata file location: block = %u part = %u\n", 996 mdata->s_mirror_file_loc, mdata->s_phys_partition_ref); 997 998 fe = udf_find_metadata_inode_efe(sb, mdata->s_mirror_file_loc, 999 mdata->s_phys_partition_ref); 1000 1001 if (IS_ERR(fe)) { 1002 udf_err(sb, "Both metadata and mirror metadata inode efe can not found\n"); 1003 return PTR_ERR(fe); 1004 } 1005 mdata->s_mirror_fe = fe; 1006 } else 1007 mdata->s_metadata_fe = fe; 1008 1009 1010 /* 1011 * bitmap file entry 1012 * Note: 1013 * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102) 1014 */ 1015 if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) { 1016 addr.logicalBlockNum = mdata->s_bitmap_file_loc; 1017 addr.partitionReferenceNum = mdata->s_phys_partition_ref; 1018 1019 udf_debug("Bitmap file location: block = %u part = %u\n", 1020 addr.logicalBlockNum, addr.partitionReferenceNum); 1021 1022 fe = udf_iget_special(sb, &addr); 1023 if (IS_ERR(fe)) { 1024 if (sb_rdonly(sb)) 1025 udf_warn(sb, "bitmap inode efe not found but it's ok since the disc is mounted read-only\n"); 1026 else { 1027 udf_err(sb, "bitmap inode efe not found and attempted read-write mount\n"); 1028 return PTR_ERR(fe); 1029 } 1030 } else 1031 mdata->s_bitmap_fe = fe; 1032 } 1033 1034 udf_debug("udf_load_metadata_files Ok\n"); 1035 return 0; 1036 } 1037 1038 int udf_compute_nr_groups(struct super_block *sb, u32 partition) 1039 { 1040 struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition]; 1041 return DIV_ROUND_UP(map->s_partition_len + 1042 (sizeof(struct spaceBitmapDesc) << 3), 1043 sb->s_blocksize * 8); 1044 } 1045 1046 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index) 1047 { 1048 struct udf_bitmap *bitmap; 1049 int nr_groups = udf_compute_nr_groups(sb, index); 1050 1051 bitmap = kvzalloc_flex(*bitmap, s_block_bitmap, nr_groups); 1052 if (!bitmap) 1053 return NULL; 1054 1055 bitmap->s_nr_groups = nr_groups; 1056 return bitmap; 1057 } 1058 1059 static int check_partition_desc(struct super_block *sb, 1060 struct partitionDesc *p, 1061 struct udf_part_map *map) 1062 { 1063 bool umap, utable, fmap, ftable; 1064 struct partitionHeaderDesc *phd; 1065 1066 switch (le32_to_cpu(p->accessType)) { 1067 case PD_ACCESS_TYPE_READ_ONLY: 1068 case PD_ACCESS_TYPE_WRITE_ONCE: 1069 case PD_ACCESS_TYPE_NONE: 1070 goto force_ro; 1071 } 1072 1073 /* No Partition Header Descriptor? */ 1074 if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) && 1075 strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03)) 1076 goto force_ro; 1077 1078 phd = (struct partitionHeaderDesc *)p->partitionContentsUse; 1079 utable = phd->unallocSpaceTable.extLength; 1080 umap = phd->unallocSpaceBitmap.extLength; 1081 ftable = phd->freedSpaceTable.extLength; 1082 fmap = phd->freedSpaceBitmap.extLength; 1083 1084 /* No allocation info? */ 1085 if (!utable && !umap && !ftable && !fmap) 1086 goto force_ro; 1087 1088 /* We don't support blocks that require erasing before overwrite */ 1089 if (ftable || fmap) 1090 goto force_ro; 1091 /* UDF 2.60: 2.3.3 - no mixing of tables & bitmaps, no VAT. */ 1092 if (utable && umap) 1093 goto force_ro; 1094 1095 if (map->s_partition_type == UDF_VIRTUAL_MAP15 || 1096 map->s_partition_type == UDF_VIRTUAL_MAP20 || 1097 map->s_partition_type == UDF_METADATA_MAP25) 1098 goto force_ro; 1099 1100 return 0; 1101 force_ro: 1102 if (!sb_rdonly(sb)) 1103 return -EACCES; 1104 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT); 1105 return 0; 1106 } 1107 1108 static int udf_fill_partdesc_info(struct super_block *sb, 1109 struct partitionDesc *p, int p_index) 1110 { 1111 struct udf_part_map *map; 1112 struct udf_sb_info *sbi = UDF_SB(sb); 1113 struct partitionHeaderDesc *phd; 1114 u32 sum; 1115 int err; 1116 1117 map = &sbi->s_partmaps[p_index]; 1118 1119 map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */ 1120 map->s_partition_root = le32_to_cpu(p->partitionStartingLocation); 1121 if (check_add_overflow(map->s_partition_root, map->s_partition_len, 1122 &sum)) { 1123 udf_err(sb, "Partition %d has invalid location %u + %u\n", 1124 p_index, map->s_partition_root, map->s_partition_len); 1125 return -EFSCORRUPTED; 1126 } 1127 1128 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY)) 1129 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY; 1130 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE)) 1131 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE; 1132 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE)) 1133 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE; 1134 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE)) 1135 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE; 1136 1137 udf_debug("Partition (%d type %x) starts at physical %u, block length %u\n", 1138 p_index, map->s_partition_type, 1139 map->s_partition_root, map->s_partition_len); 1140 1141 err = check_partition_desc(sb, p, map); 1142 if (err) 1143 return err; 1144 1145 /* 1146 * Skip loading allocation info it we cannot ever write to the fs. 1147 * This is a correctness thing as we may have decided to force ro mount 1148 * to avoid allocation info we don't support. 1149 */ 1150 if (UDF_QUERY_FLAG(sb, UDF_FLAG_RW_INCOMPAT)) 1151 return 0; 1152 1153 phd = (struct partitionHeaderDesc *)p->partitionContentsUse; 1154 if (phd->unallocSpaceTable.extLength) { 1155 struct kernel_lb_addr loc = { 1156 .logicalBlockNum = le32_to_cpu( 1157 phd->unallocSpaceTable.extPosition), 1158 .partitionReferenceNum = p_index, 1159 }; 1160 struct inode *inode; 1161 1162 inode = udf_iget_special(sb, &loc); 1163 if (IS_ERR(inode)) { 1164 udf_debug("cannot load unallocSpaceTable (part %d)\n", 1165 p_index); 1166 return PTR_ERR(inode); 1167 } 1168 map->s_uspace.s_table = inode; 1169 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE; 1170 udf_debug("unallocSpaceTable (part %d) @ %llu\n", 1171 p_index, map->s_uspace.s_table->i_ino); 1172 } 1173 1174 if (phd->unallocSpaceBitmap.extLength) { 1175 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index); 1176 if (!bitmap) 1177 return -ENOMEM; 1178 map->s_uspace.s_bitmap = bitmap; 1179 bitmap->s_extPosition = le32_to_cpu( 1180 phd->unallocSpaceBitmap.extPosition); 1181 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP; 1182 /* Check whether math over bitmap won't overflow. */ 1183 if (check_add_overflow(map->s_partition_len, 1184 sizeof(struct spaceBitmapDesc) << 3, 1185 &sum)) { 1186 udf_err(sb, "Partition %d is too long (%u)\n", p_index, 1187 map->s_partition_len); 1188 return -EFSCORRUPTED; 1189 } 1190 udf_debug("unallocSpaceBitmap (part %d) @ %u\n", 1191 p_index, bitmap->s_extPosition); 1192 } 1193 1194 return 0; 1195 } 1196 1197 static void udf_find_vat_block(struct super_block *sb, int p_index, 1198 int type1_index, sector_t start_block) 1199 { 1200 struct udf_sb_info *sbi = UDF_SB(sb); 1201 struct udf_part_map *map = &sbi->s_partmaps[p_index]; 1202 sector_t vat_block; 1203 struct kernel_lb_addr ino; 1204 struct inode *inode; 1205 1206 /* 1207 * VAT file entry is in the last recorded block. Some broken disks have 1208 * it a few blocks before so try a bit harder... 1209 */ 1210 ino.partitionReferenceNum = type1_index; 1211 for (vat_block = start_block; 1212 vat_block >= map->s_partition_root && 1213 vat_block >= start_block - 3; vat_block--) { 1214 ino.logicalBlockNum = vat_block - map->s_partition_root; 1215 inode = udf_iget_special(sb, &ino); 1216 if (!IS_ERR(inode)) { 1217 sbi->s_vat_inode = inode; 1218 break; 1219 } 1220 } 1221 } 1222 1223 static int udf_load_vat(struct super_block *sb, int p_index, int type1_index) 1224 { 1225 struct udf_sb_info *sbi = UDF_SB(sb); 1226 struct udf_part_map *map = &sbi->s_partmaps[p_index]; 1227 struct buffer_head *bh = NULL; 1228 struct udf_inode_info *vati; 1229 struct virtualAllocationTable20 *vat20; 1230 sector_t blocks = sb_bdev_nr_blocks(sb); 1231 1232 udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block); 1233 if (!sbi->s_vat_inode && 1234 sbi->s_last_block != blocks - 1) { 1235 pr_notice("Failed to read VAT inode from the last recorded block (%lu), retrying with the last block of the device (%lu).\n", 1236 (unsigned long)sbi->s_last_block, 1237 (unsigned long)blocks - 1); 1238 udf_find_vat_block(sb, p_index, type1_index, blocks - 1); 1239 } 1240 if (!sbi->s_vat_inode) 1241 return -EIO; 1242 1243 if (map->s_partition_type == UDF_VIRTUAL_MAP15) { 1244 map->s_type_specific.s_virtual.s_start_offset = 0; 1245 if (sbi->s_vat_inode->i_size < 36) { 1246 udf_err(sb, "Too short VAT inode size %lld\n", 1247 sbi->s_vat_inode->i_size); 1248 return -EFSCORRUPTED; 1249 } 1250 map->s_type_specific.s_virtual.s_num_entries = 1251 (sbi->s_vat_inode->i_size - 36) >> 2; 1252 } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) { 1253 vati = UDF_I(sbi->s_vat_inode); 1254 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { 1255 int err = 0; 1256 1257 bh = udf_bread(sbi->s_vat_inode, 0, 0, &err); 1258 if (!bh) { 1259 if (!err) 1260 err = -EFSCORRUPTED; 1261 return err; 1262 } 1263 vat20 = (struct virtualAllocationTable20 *)bh->b_data; 1264 } else { 1265 vat20 = (struct virtualAllocationTable20 *) 1266 vati->i_data; 1267 } 1268 1269 map->s_type_specific.s_virtual.s_start_offset = 1270 le16_to_cpu(vat20->lengthHeader); 1271 if (map->s_type_specific.s_virtual.s_start_offset 1272 > sbi->s_vat_inode->i_size) { 1273 udf_err(sb, "Corrupted VAT header length %u (VAT inode size %lld)\n", 1274 map->s_type_specific.s_virtual.s_start_offset, 1275 sbi->s_vat_inode->i_size); 1276 brelse(bh); 1277 return -EFSCORRUPTED; 1278 } 1279 map->s_type_specific.s_virtual.s_num_entries = 1280 (sbi->s_vat_inode->i_size - 1281 map->s_type_specific.s_virtual. 1282 s_start_offset) >> 2; 1283 brelse(bh); 1284 } 1285 return 0; 1286 } 1287 1288 /* 1289 * Load partition descriptor block 1290 * 1291 * Returns <0 on error, 0 on success, -EAGAIN is special - try next descriptor 1292 * sequence. 1293 */ 1294 static int udf_load_partdesc(struct super_block *sb, sector_t block) 1295 { 1296 struct buffer_head *bh; 1297 struct partitionDesc *p; 1298 struct udf_part_map *map; 1299 struct udf_sb_info *sbi = UDF_SB(sb); 1300 int i, type1_idx; 1301 uint16_t partitionNumber; 1302 uint16_t ident; 1303 int ret; 1304 1305 bh = udf_read_tagged(sb, block, block, &ident); 1306 if (!bh) 1307 return -EAGAIN; 1308 if (ident != TAG_IDENT_PD) { 1309 ret = 0; 1310 goto out_bh; 1311 } 1312 1313 p = (struct partitionDesc *)bh->b_data; 1314 partitionNumber = le16_to_cpu(p->partitionNumber); 1315 1316 /* First scan for TYPE1 and SPARABLE partitions */ 1317 for (i = 0; i < sbi->s_partitions; i++) { 1318 map = &sbi->s_partmaps[i]; 1319 udf_debug("Searching map: (%u == %u)\n", 1320 map->s_partition_num, partitionNumber); 1321 if (map->s_partition_num == partitionNumber && 1322 (map->s_partition_type == UDF_TYPE1_MAP15 || 1323 map->s_partition_type == UDF_SPARABLE_MAP15)) 1324 break; 1325 } 1326 1327 if (i >= sbi->s_partitions) { 1328 udf_debug("Partition (%u) not found in partition map\n", 1329 partitionNumber); 1330 ret = 0; 1331 goto out_bh; 1332 } 1333 1334 ret = udf_fill_partdesc_info(sb, p, i); 1335 if (ret < 0) 1336 goto out_bh; 1337 1338 /* 1339 * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and 1340 * PHYSICAL partitions are already set up 1341 */ 1342 type1_idx = i; 1343 map = NULL; /* supress 'maybe used uninitialized' warning */ 1344 for (i = 0; i < sbi->s_partitions; i++) { 1345 map = &sbi->s_partmaps[i]; 1346 1347 if (map->s_partition_num == partitionNumber && 1348 (map->s_partition_type == UDF_VIRTUAL_MAP15 || 1349 map->s_partition_type == UDF_VIRTUAL_MAP20 || 1350 map->s_partition_type == UDF_METADATA_MAP25)) 1351 break; 1352 } 1353 1354 if (i >= sbi->s_partitions) { 1355 ret = 0; 1356 goto out_bh; 1357 } 1358 1359 ret = udf_fill_partdesc_info(sb, p, i); 1360 if (ret < 0) 1361 goto out_bh; 1362 1363 if (map->s_partition_type == UDF_METADATA_MAP25) { 1364 ret = udf_load_metadata_files(sb, i, type1_idx); 1365 if (ret < 0) { 1366 udf_err(sb, "error loading MetaData partition map %d\n", 1367 i); 1368 goto out_bh; 1369 } 1370 } else { 1371 /* 1372 * If we have a partition with virtual map, we don't handle 1373 * writing to it (we overwrite blocks instead of relocating 1374 * them). 1375 */ 1376 if (!sb_rdonly(sb)) { 1377 ret = -EACCES; 1378 goto out_bh; 1379 } 1380 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT); 1381 ret = udf_load_vat(sb, i, type1_idx); 1382 if (ret < 0) 1383 goto out_bh; 1384 } 1385 ret = 0; 1386 out_bh: 1387 /* In case loading failed, we handle cleanup in udf_fill_super */ 1388 brelse(bh); 1389 return ret; 1390 } 1391 1392 static int udf_load_sparable_map(struct super_block *sb, 1393 struct udf_part_map *map, 1394 struct sparablePartitionMap *spm) 1395 { 1396 uint32_t loc; 1397 uint16_t ident; 1398 struct sparingTable *st; 1399 struct udf_sparing_data *sdata = &map->s_type_specific.s_sparing; 1400 int i; 1401 struct buffer_head *bh; 1402 1403 map->s_partition_type = UDF_SPARABLE_MAP15; 1404 sdata->s_packet_len = le16_to_cpu(spm->packetLength); 1405 if (!is_power_of_2(sdata->s_packet_len)) { 1406 udf_err(sb, "error loading logical volume descriptor: " 1407 "Invalid packet length %u\n", 1408 (unsigned)sdata->s_packet_len); 1409 return -EIO; 1410 } 1411 if (spm->numSparingTables > 4) { 1412 udf_err(sb, "error loading logical volume descriptor: " 1413 "Too many sparing tables (%d)\n", 1414 (int)spm->numSparingTables); 1415 return -EIO; 1416 } 1417 if (le32_to_cpu(spm->sizeSparingTable) > sb->s_blocksize) { 1418 udf_err(sb, "error loading logical volume descriptor: " 1419 "Too big sparing table size (%u)\n", 1420 le32_to_cpu(spm->sizeSparingTable)); 1421 return -EIO; 1422 } 1423 1424 for (i = 0; i < spm->numSparingTables; i++) { 1425 loc = le32_to_cpu(spm->locSparingTable[i]); 1426 bh = udf_read_tagged(sb, loc, loc, &ident); 1427 if (!bh) 1428 continue; 1429 1430 st = (struct sparingTable *)bh->b_data; 1431 if (ident != 0 || 1432 strncmp(st->sparingIdent.ident, UDF_ID_SPARING, 1433 strlen(UDF_ID_SPARING)) || 1434 struct_size(st, mapEntry, 1435 le16_to_cpu(st->reallocationTableLen)) > 1436 sb->s_blocksize) { 1437 brelse(bh); 1438 continue; 1439 } 1440 1441 sdata->s_spar_map[i] = bh; 1442 } 1443 map->s_partition_func = udf_get_pblock_spar15; 1444 return 0; 1445 } 1446 1447 static int udf_load_logicalvol(struct super_block *sb, sector_t block, 1448 struct kernel_lb_addr *fileset) 1449 { 1450 struct logicalVolDesc *lvd; 1451 int i, offset; 1452 uint8_t type; 1453 struct udf_sb_info *sbi = UDF_SB(sb); 1454 struct genericPartitionMap *gpm; 1455 uint16_t ident; 1456 struct buffer_head *bh; 1457 unsigned int table_len, part_map_count; 1458 int ret; 1459 1460 bh = udf_read_tagged(sb, block, block, &ident); 1461 if (!bh) 1462 return -EAGAIN; 1463 BUG_ON(ident != TAG_IDENT_LVD); 1464 lvd = (struct logicalVolDesc *)bh->b_data; 1465 table_len = le32_to_cpu(lvd->mapTableLength); 1466 if (table_len > sb->s_blocksize - sizeof(*lvd)) { 1467 udf_err(sb, "error loading logical volume descriptor: " 1468 "Partition table too long (%u > %lu)\n", table_len, 1469 sb->s_blocksize - sizeof(*lvd)); 1470 ret = -EIO; 1471 goto out_bh; 1472 } 1473 1474 ret = udf_verify_domain_identifier(sb, &lvd->domainIdent, 1475 "logical volume"); 1476 if (ret) 1477 goto out_bh; 1478 1479 part_map_count = le32_to_cpu(lvd->numPartitionMaps); 1480 if (part_map_count > table_len / sizeof(struct genericPartitionMap1)) { 1481 udf_err(sb, "error loading logical volume descriptor: " 1482 "Too many partition maps (%u > %u)\n", part_map_count, 1483 table_len / (unsigned)sizeof(struct genericPartitionMap1)); 1484 ret = -EIO; 1485 goto out_bh; 1486 } 1487 ret = udf_sb_alloc_partition_maps(sb, part_map_count); 1488 if (ret) 1489 goto out_bh; 1490 1491 for (i = 0, offset = 0; 1492 i < sbi->s_partitions && offset < table_len; 1493 i++, offset += gpm->partitionMapLength) { 1494 struct udf_part_map *map = &sbi->s_partmaps[i]; 1495 gpm = (struct genericPartitionMap *) 1496 &(lvd->partitionMaps[offset]); 1497 type = gpm->partitionMapType; 1498 if (type == 1) { 1499 struct genericPartitionMap1 *gpm1 = 1500 (struct genericPartitionMap1 *)gpm; 1501 map->s_partition_type = UDF_TYPE1_MAP15; 1502 map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum); 1503 map->s_partition_num = le16_to_cpu(gpm1->partitionNum); 1504 map->s_partition_func = NULL; 1505 } else if (type == 2) { 1506 struct udfPartitionMap2 *upm2 = 1507 (struct udfPartitionMap2 *)gpm; 1508 if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL, 1509 strlen(UDF_ID_VIRTUAL))) { 1510 u16 suf = 1511 le16_to_cpu(((__le16 *)upm2->partIdent. 1512 identSuffix)[0]); 1513 if (suf < 0x0200) { 1514 map->s_partition_type = 1515 UDF_VIRTUAL_MAP15; 1516 map->s_partition_func = 1517 udf_get_pblock_virt15; 1518 } else { 1519 map->s_partition_type = 1520 UDF_VIRTUAL_MAP20; 1521 map->s_partition_func = 1522 udf_get_pblock_virt20; 1523 } 1524 } else if (!strncmp(upm2->partIdent.ident, 1525 UDF_ID_SPARABLE, 1526 strlen(UDF_ID_SPARABLE))) { 1527 ret = udf_load_sparable_map(sb, map, 1528 (struct sparablePartitionMap *)gpm); 1529 if (ret < 0) 1530 goto out_bh; 1531 } else if (!strncmp(upm2->partIdent.ident, 1532 UDF_ID_METADATA, 1533 strlen(UDF_ID_METADATA))) { 1534 struct udf_meta_data *mdata = 1535 &map->s_type_specific.s_metadata; 1536 struct metadataPartitionMap *mdm = 1537 (struct metadataPartitionMap *) 1538 &(lvd->partitionMaps[offset]); 1539 udf_debug("Parsing Logical vol part %d type %u id=%s\n", 1540 i, type, UDF_ID_METADATA); 1541 1542 map->s_partition_type = UDF_METADATA_MAP25; 1543 map->s_partition_func = udf_get_pblock_meta25; 1544 1545 mdata->s_meta_file_loc = 1546 le32_to_cpu(mdm->metadataFileLoc); 1547 mdata->s_mirror_file_loc = 1548 le32_to_cpu(mdm->metadataMirrorFileLoc); 1549 mdata->s_bitmap_file_loc = 1550 le32_to_cpu(mdm->metadataBitmapFileLoc); 1551 mdata->s_alloc_unit_size = 1552 le32_to_cpu(mdm->allocUnitSize); 1553 mdata->s_align_unit_size = 1554 le16_to_cpu(mdm->alignUnitSize); 1555 if (mdm->flags & 0x01) 1556 mdata->s_flags |= MF_DUPLICATE_MD; 1557 1558 udf_debug("Metadata Ident suffix=0x%x\n", 1559 le16_to_cpu(*(__le16 *) 1560 mdm->partIdent.identSuffix)); 1561 udf_debug("Metadata part num=%u\n", 1562 le16_to_cpu(mdm->partitionNum)); 1563 udf_debug("Metadata part alloc unit size=%u\n", 1564 le32_to_cpu(mdm->allocUnitSize)); 1565 udf_debug("Metadata file loc=%u\n", 1566 le32_to_cpu(mdm->metadataFileLoc)); 1567 udf_debug("Mirror file loc=%u\n", 1568 le32_to_cpu(mdm->metadataMirrorFileLoc)); 1569 udf_debug("Bitmap file loc=%u\n", 1570 le32_to_cpu(mdm->metadataBitmapFileLoc)); 1571 udf_debug("Flags: %d %u\n", 1572 mdata->s_flags, mdm->flags); 1573 } else { 1574 udf_debug("Unknown ident: %s\n", 1575 upm2->partIdent.ident); 1576 continue; 1577 } 1578 map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum); 1579 map->s_partition_num = le16_to_cpu(upm2->partitionNum); 1580 } 1581 udf_debug("Partition (%d:%u) type %u on volume %u\n", 1582 i, map->s_partition_num, type, map->s_volumeseqnum); 1583 } 1584 1585 if (fileset) { 1586 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]); 1587 1588 *fileset = lelb_to_cpu(la->extLocation); 1589 udf_debug("FileSet found in LogicalVolDesc at block=%u, partition=%u\n", 1590 fileset->logicalBlockNum, 1591 fileset->partitionReferenceNum); 1592 } 1593 if (lvd->integritySeqExt.extLength) 1594 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt)); 1595 ret = 0; 1596 1597 if (!sbi->s_lvid_bh) { 1598 /* We can't generate unique IDs without a valid LVID */ 1599 if (sb_rdonly(sb)) { 1600 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT); 1601 } else { 1602 udf_warn(sb, "Damaged or missing LVID, forcing " 1603 "readonly mount\n"); 1604 ret = -EACCES; 1605 } 1606 } 1607 out_bh: 1608 brelse(bh); 1609 return ret; 1610 } 1611 1612 static bool udf_lvid_valid(struct super_block *sb, 1613 struct logicalVolIntegrityDesc *lvid) 1614 { 1615 u32 parts, impuselen; 1616 1617 parts = le32_to_cpu(lvid->numOfPartitions); 1618 impuselen = le32_to_cpu(lvid->lengthOfImpUse); 1619 if (parts >= sb->s_blocksize || impuselen >= sb->s_blocksize || 1620 sizeof(struct logicalVolIntegrityDesc) + impuselen + 1621 2 * parts * sizeof(u32) > sb->s_blocksize) 1622 return false; 1623 return true; 1624 } 1625 1626 /* 1627 * Find the prevailing Logical Volume Integrity Descriptor. 1628 */ 1629 static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc) 1630 { 1631 struct buffer_head *bh, *final_bh; 1632 uint16_t ident; 1633 struct udf_sb_info *sbi = UDF_SB(sb); 1634 struct logicalVolIntegrityDesc *lvid; 1635 int indirections = 0; 1636 1637 while (++indirections <= UDF_MAX_LVID_NESTING) { 1638 final_bh = NULL; 1639 while (loc.extLength > 0 && 1640 (bh = udf_read_tagged(sb, loc.extLocation, 1641 loc.extLocation, &ident))) { 1642 if (ident != TAG_IDENT_LVID) { 1643 brelse(bh); 1644 break; 1645 } 1646 1647 brelse(final_bh); 1648 final_bh = bh; 1649 1650 loc.extLength -= sb->s_blocksize; 1651 loc.extLocation++; 1652 } 1653 1654 if (!final_bh) 1655 return; 1656 1657 lvid = (struct logicalVolIntegrityDesc *)final_bh->b_data; 1658 if (udf_lvid_valid(sb, lvid)) { 1659 brelse(sbi->s_lvid_bh); 1660 sbi->s_lvid_bh = final_bh; 1661 } else { 1662 udf_warn(sb, "Corrupted LVID (parts=%u, impuselen=%u), " 1663 "ignoring.\n", 1664 le32_to_cpu(lvid->numOfPartitions), 1665 le32_to_cpu(lvid->lengthOfImpUse)); 1666 } 1667 1668 if (lvid->nextIntegrityExt.extLength == 0) 1669 return; 1670 1671 loc = leea_to_cpu(lvid->nextIntegrityExt); 1672 } 1673 1674 udf_warn(sb, "Too many LVID indirections (max %u), ignoring.\n", 1675 UDF_MAX_LVID_NESTING); 1676 brelse(sbi->s_lvid_bh); 1677 sbi->s_lvid_bh = NULL; 1678 } 1679 1680 /* 1681 * Step for reallocation of table of partition descriptor sequence numbers. 1682 * Must be power of 2. 1683 */ 1684 #define PART_DESC_ALLOC_STEP 32 1685 1686 struct part_desc_seq_scan_data { 1687 struct udf_vds_record rec; 1688 u32 partnum; 1689 }; 1690 1691 struct desc_seq_scan_data { 1692 struct udf_vds_record vds[VDS_POS_LENGTH]; 1693 unsigned int size_part_descs; 1694 unsigned int num_part_descs; 1695 struct part_desc_seq_scan_data *part_descs_loc; 1696 }; 1697 1698 static struct udf_vds_record *handle_partition_descriptor( 1699 struct buffer_head *bh, 1700 struct desc_seq_scan_data *data) 1701 { 1702 struct partitionDesc *desc = (struct partitionDesc *)bh->b_data; 1703 int partnum; 1704 int i; 1705 1706 partnum = le16_to_cpu(desc->partitionNumber); 1707 for (i = 0; i < data->num_part_descs; i++) 1708 if (partnum == data->part_descs_loc[i].partnum) 1709 return &(data->part_descs_loc[i].rec); 1710 if (data->num_part_descs >= data->size_part_descs) { 1711 struct part_desc_seq_scan_data *new_loc; 1712 unsigned int new_size; 1713 1714 new_size = data->num_part_descs + PART_DESC_ALLOC_STEP; 1715 new_loc = kzalloc_objs(*new_loc, new_size); 1716 if (!new_loc) 1717 return ERR_PTR(-ENOMEM); 1718 memcpy(new_loc, data->part_descs_loc, 1719 data->size_part_descs * sizeof(*new_loc)); 1720 kfree(data->part_descs_loc); 1721 data->part_descs_loc = new_loc; 1722 data->size_part_descs = new_size; 1723 } 1724 data->part_descs_loc[data->num_part_descs].partnum = partnum; 1725 return &(data->part_descs_loc[data->num_part_descs++].rec); 1726 } 1727 1728 1729 static struct udf_vds_record *get_volume_descriptor_record(uint16_t ident, 1730 struct buffer_head *bh, struct desc_seq_scan_data *data) 1731 { 1732 switch (ident) { 1733 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */ 1734 return &(data->vds[VDS_POS_PRIMARY_VOL_DESC]); 1735 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */ 1736 return &(data->vds[VDS_POS_IMP_USE_VOL_DESC]); 1737 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */ 1738 return &(data->vds[VDS_POS_LOGICAL_VOL_DESC]); 1739 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */ 1740 return &(data->vds[VDS_POS_UNALLOC_SPACE_DESC]); 1741 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */ 1742 return handle_partition_descriptor(bh, data); 1743 } 1744 return NULL; 1745 } 1746 1747 /* 1748 * Process a main/reserve volume descriptor sequence. 1749 * @block First block of first extent of the sequence. 1750 * @lastblock Lastblock of first extent of the sequence. 1751 * @fileset There we store extent containing root fileset 1752 * 1753 * Returns <0 on error, 0 on success. -EAGAIN is special - try next descriptor 1754 * sequence 1755 */ 1756 static noinline int udf_process_sequence( 1757 struct super_block *sb, 1758 sector_t block, sector_t lastblock, 1759 struct kernel_lb_addr *fileset) 1760 { 1761 struct buffer_head *bh = NULL; 1762 struct udf_vds_record *curr; 1763 struct generic_desc *gd; 1764 struct volDescPtr *vdp; 1765 bool done = false; 1766 uint32_t vdsn; 1767 uint16_t ident; 1768 int ret; 1769 unsigned int indirections = 0; 1770 struct desc_seq_scan_data data; 1771 unsigned int i; 1772 1773 memset(data.vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH); 1774 data.size_part_descs = PART_DESC_ALLOC_STEP; 1775 data.num_part_descs = 0; 1776 data.part_descs_loc = kzalloc_objs(*data.part_descs_loc, 1777 data.size_part_descs); 1778 if (!data.part_descs_loc) 1779 return -ENOMEM; 1780 1781 /* 1782 * Read the main descriptor sequence and find which descriptors 1783 * are in it. 1784 */ 1785 for (; (!done && block <= lastblock); block++) { 1786 bh = udf_read_tagged(sb, block, block, &ident); 1787 if (!bh) 1788 break; 1789 1790 /* Process each descriptor (ISO 13346 3/8.3-8.4) */ 1791 gd = (struct generic_desc *)bh->b_data; 1792 vdsn = le32_to_cpu(gd->volDescSeqNum); 1793 switch (ident) { 1794 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */ 1795 if (++indirections > UDF_MAX_TD_NESTING) { 1796 udf_err(sb, "too many Volume Descriptor " 1797 "Pointers (max %u supported)\n", 1798 UDF_MAX_TD_NESTING); 1799 brelse(bh); 1800 ret = -EIO; 1801 goto out; 1802 } 1803 1804 vdp = (struct volDescPtr *)bh->b_data; 1805 block = le32_to_cpu(vdp->nextVolDescSeqExt.extLocation); 1806 lastblock = le32_to_cpu( 1807 vdp->nextVolDescSeqExt.extLength) >> 1808 sb->s_blocksize_bits; 1809 lastblock += block - 1; 1810 /* For loop is going to increment 'block' again */ 1811 block--; 1812 break; 1813 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */ 1814 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */ 1815 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */ 1816 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */ 1817 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */ 1818 curr = get_volume_descriptor_record(ident, bh, &data); 1819 if (IS_ERR(curr)) { 1820 brelse(bh); 1821 ret = PTR_ERR(curr); 1822 goto out; 1823 } 1824 /* Descriptor we don't care about? */ 1825 if (!curr) 1826 break; 1827 if (vdsn >= curr->volDescSeqNum) { 1828 curr->volDescSeqNum = vdsn; 1829 curr->block = block; 1830 } 1831 break; 1832 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */ 1833 done = true; 1834 break; 1835 } 1836 brelse(bh); 1837 } 1838 /* 1839 * Now read interesting descriptors again and process them 1840 * in a suitable order 1841 */ 1842 if (!data.vds[VDS_POS_PRIMARY_VOL_DESC].block) { 1843 udf_err(sb, "Primary Volume Descriptor not found!\n"); 1844 ret = -EAGAIN; 1845 goto out; 1846 } 1847 ret = udf_load_pvoldesc(sb, data.vds[VDS_POS_PRIMARY_VOL_DESC].block); 1848 if (ret < 0) 1849 goto out; 1850 1851 if (data.vds[VDS_POS_LOGICAL_VOL_DESC].block) { 1852 ret = udf_load_logicalvol(sb, 1853 data.vds[VDS_POS_LOGICAL_VOL_DESC].block, 1854 fileset); 1855 if (ret < 0) 1856 goto out; 1857 } 1858 1859 /* Now handle prevailing Partition Descriptors */ 1860 for (i = 0; i < data.num_part_descs; i++) { 1861 ret = udf_load_partdesc(sb, data.part_descs_loc[i].rec.block); 1862 if (ret < 0) 1863 goto out; 1864 } 1865 ret = 0; 1866 out: 1867 kfree(data.part_descs_loc); 1868 return ret; 1869 } 1870 1871 /* 1872 * Load Volume Descriptor Sequence described by anchor in bh 1873 * 1874 * Returns <0 on error, 0 on success 1875 */ 1876 static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh, 1877 struct kernel_lb_addr *fileset) 1878 { 1879 struct anchorVolDescPtr *anchor; 1880 sector_t main_s, main_e, reserve_s, reserve_e; 1881 int ret; 1882 1883 anchor = (struct anchorVolDescPtr *)bh->b_data; 1884 1885 /* Locate the main sequence */ 1886 main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation); 1887 main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength); 1888 main_e = main_e >> sb->s_blocksize_bits; 1889 main_e += main_s - 1; 1890 1891 /* Locate the reserve sequence */ 1892 reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation); 1893 reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength); 1894 reserve_e = reserve_e >> sb->s_blocksize_bits; 1895 reserve_e += reserve_s - 1; 1896 1897 /* Process the main & reserve sequences */ 1898 /* responsible for finding the PartitionDesc(s) */ 1899 ret = udf_process_sequence(sb, main_s, main_e, fileset); 1900 if (ret != -EAGAIN) 1901 return ret; 1902 udf_sb_free_partitions(sb); 1903 ret = udf_process_sequence(sb, reserve_s, reserve_e, fileset); 1904 if (ret < 0) { 1905 udf_sb_free_partitions(sb); 1906 /* No sequence was OK, return -EIO */ 1907 if (ret == -EAGAIN) 1908 ret = -EIO; 1909 } 1910 return ret; 1911 } 1912 1913 /* 1914 * Check whether there is an anchor block in the given block and 1915 * load Volume Descriptor Sequence if so. 1916 * 1917 * Returns <0 on error, 0 on success, -EAGAIN is special - try next anchor 1918 * block 1919 */ 1920 static int udf_check_anchor_block(struct super_block *sb, sector_t block, 1921 struct kernel_lb_addr *fileset) 1922 { 1923 struct buffer_head *bh; 1924 uint16_t ident; 1925 int ret; 1926 1927 bh = udf_read_tagged(sb, block, block, &ident); 1928 if (!bh) 1929 return -EAGAIN; 1930 if (ident != TAG_IDENT_AVDP) { 1931 brelse(bh); 1932 return -EAGAIN; 1933 } 1934 ret = udf_load_sequence(sb, bh, fileset); 1935 brelse(bh); 1936 return ret; 1937 } 1938 1939 /* 1940 * Search for an anchor volume descriptor pointer. 1941 * 1942 * Returns < 0 on error, 0 on success. -EAGAIN is special - try next set 1943 * of anchors. 1944 */ 1945 static int udf_scan_anchors(struct super_block *sb, udf_pblk_t *lastblock, 1946 struct kernel_lb_addr *fileset) 1947 { 1948 udf_pblk_t last[6]; 1949 int i; 1950 struct udf_sb_info *sbi = UDF_SB(sb); 1951 int last_count = 0; 1952 int ret; 1953 1954 /* First try user provided anchor */ 1955 if (sbi->s_anchor) { 1956 ret = udf_check_anchor_block(sb, sbi->s_anchor, fileset); 1957 if (ret != -EAGAIN) 1958 return ret; 1959 } 1960 /* 1961 * according to spec, anchor is in either: 1962 * block 256 1963 * lastblock-256 1964 * lastblock 1965 * however, if the disc isn't closed, it could be 512. 1966 */ 1967 ret = udf_check_anchor_block(sb, sbi->s_session + 256, fileset); 1968 if (ret != -EAGAIN) 1969 return ret; 1970 /* 1971 * The trouble is which block is the last one. Drives often misreport 1972 * this so we try various possibilities. 1973 */ 1974 last[last_count++] = *lastblock; 1975 if (*lastblock >= 1) 1976 last[last_count++] = *lastblock - 1; 1977 last[last_count++] = *lastblock + 1; 1978 if (*lastblock >= 2) 1979 last[last_count++] = *lastblock - 2; 1980 if (*lastblock >= 150) 1981 last[last_count++] = *lastblock - 150; 1982 if (*lastblock >= 152) 1983 last[last_count++] = *lastblock - 152; 1984 1985 for (i = 0; i < last_count; i++) { 1986 if (last[i] >= sb_bdev_nr_blocks(sb)) 1987 continue; 1988 ret = udf_check_anchor_block(sb, last[i], fileset); 1989 if (ret != -EAGAIN) { 1990 if (!ret) 1991 *lastblock = last[i]; 1992 return ret; 1993 } 1994 if (last[i] < 256) 1995 continue; 1996 ret = udf_check_anchor_block(sb, last[i] - 256, fileset); 1997 if (ret != -EAGAIN) { 1998 if (!ret) 1999 *lastblock = last[i]; 2000 return ret; 2001 } 2002 } 2003 2004 /* Finally try block 512 in case media is open */ 2005 return udf_check_anchor_block(sb, sbi->s_session + 512, fileset); 2006 } 2007 2008 /* 2009 * Check Volume Structure Descriptor, find Anchor block and load Volume 2010 * Descriptor Sequence. 2011 * 2012 * Returns < 0 on error, 0 on success. -EAGAIN is special meaning anchor 2013 * block was not found. 2014 */ 2015 static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt, 2016 int silent, struct kernel_lb_addr *fileset) 2017 { 2018 struct udf_sb_info *sbi = UDF_SB(sb); 2019 int nsr = 0; 2020 int ret; 2021 2022 if (!sb_set_blocksize(sb, uopt->blocksize)) { 2023 if (!silent) 2024 udf_warn(sb, "Bad block size\n"); 2025 return -EINVAL; 2026 } 2027 sbi->s_last_block = uopt->lastblock; 2028 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_NOVRS)) { 2029 /* Check that it is NSR02 compliant */ 2030 nsr = udf_check_vsd(sb); 2031 if (!nsr) { 2032 if (!silent) 2033 udf_warn(sb, "No VRS found\n"); 2034 return -EINVAL; 2035 } 2036 if (nsr == -1) 2037 udf_debug("Failed to read sector at offset %d. " 2038 "Assuming open disc. Skipping validity " 2039 "check\n", VSD_FIRST_SECTOR_OFFSET); 2040 if (!sbi->s_last_block) 2041 sbi->s_last_block = udf_get_last_block(sb); 2042 } else { 2043 udf_debug("Validity check skipped because of novrs option\n"); 2044 } 2045 2046 /* Look for anchor block and load Volume Descriptor Sequence */ 2047 sbi->s_anchor = uopt->anchor; 2048 ret = udf_scan_anchors(sb, &sbi->s_last_block, fileset); 2049 if (ret < 0) { 2050 if (!silent && ret == -EAGAIN) 2051 udf_warn(sb, "No anchor found\n"); 2052 return ret; 2053 } 2054 return 0; 2055 } 2056 2057 static void udf_finalize_lvid(struct logicalVolIntegrityDesc *lvid) 2058 { 2059 struct timespec64 ts; 2060 2061 ktime_get_real_ts64(&ts); 2062 udf_time_to_disk_stamp(&lvid->recordingDateAndTime, ts); 2063 lvid->descTag.descCRC = cpu_to_le16( 2064 crc_itu_t(0, (char *)lvid + sizeof(struct tag), 2065 le16_to_cpu(lvid->descTag.descCRCLength))); 2066 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag); 2067 } 2068 2069 static void udf_open_lvid(struct super_block *sb) 2070 { 2071 struct udf_sb_info *sbi = UDF_SB(sb); 2072 struct buffer_head *bh = sbi->s_lvid_bh; 2073 struct logicalVolIntegrityDesc *lvid; 2074 struct logicalVolIntegrityDescImpUse *lvidiu; 2075 2076 if (!bh) 2077 return; 2078 lvid = (struct logicalVolIntegrityDesc *)bh->b_data; 2079 lvidiu = udf_sb_lvidiu(sb); 2080 if (!lvidiu) 2081 return; 2082 2083 mutex_lock(&sbi->s_alloc_mutex); 2084 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX; 2085 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX; 2086 if (le32_to_cpu(lvid->integrityType) == LVID_INTEGRITY_TYPE_CLOSE) 2087 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN); 2088 else 2089 UDF_SET_FLAG(sb, UDF_FLAG_INCONSISTENT); 2090 2091 udf_finalize_lvid(lvid); 2092 mark_buffer_dirty(bh); 2093 sbi->s_lvid_dirty = 0; 2094 mutex_unlock(&sbi->s_alloc_mutex); 2095 /* Make opening of filesystem visible on the media immediately */ 2096 sync_dirty_buffer(bh); 2097 } 2098 2099 static void udf_close_lvid(struct super_block *sb) 2100 { 2101 struct udf_sb_info *sbi = UDF_SB(sb); 2102 struct buffer_head *bh = sbi->s_lvid_bh; 2103 struct logicalVolIntegrityDesc *lvid; 2104 struct logicalVolIntegrityDescImpUse *lvidiu; 2105 2106 if (!bh) 2107 return; 2108 lvid = (struct logicalVolIntegrityDesc *)bh->b_data; 2109 lvidiu = udf_sb_lvidiu(sb); 2110 if (!lvidiu) 2111 return; 2112 2113 mutex_lock(&sbi->s_alloc_mutex); 2114 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX; 2115 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX; 2116 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev)) 2117 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION); 2118 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev)) 2119 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev); 2120 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev)) 2121 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev); 2122 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_INCONSISTENT)) 2123 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE); 2124 2125 /* 2126 * We set buffer uptodate unconditionally here to avoid spurious 2127 * warnings from mark_buffer_dirty() when previous EIO has marked 2128 * the buffer as !uptodate 2129 */ 2130 set_buffer_uptodate(bh); 2131 udf_finalize_lvid(lvid); 2132 mark_buffer_dirty(bh); 2133 sbi->s_lvid_dirty = 0; 2134 mutex_unlock(&sbi->s_alloc_mutex); 2135 /* Make closing of filesystem visible on the media immediately */ 2136 sync_dirty_buffer(bh); 2137 } 2138 2139 u64 lvid_get_unique_id(struct super_block *sb) 2140 { 2141 struct buffer_head *bh; 2142 struct udf_sb_info *sbi = UDF_SB(sb); 2143 struct logicalVolIntegrityDesc *lvid; 2144 struct logicalVolHeaderDesc *lvhd; 2145 u64 uniqueID; 2146 u64 ret; 2147 2148 bh = sbi->s_lvid_bh; 2149 if (!bh) 2150 return 0; 2151 2152 lvid = (struct logicalVolIntegrityDesc *)bh->b_data; 2153 lvhd = (struct logicalVolHeaderDesc *)lvid->logicalVolContentsUse; 2154 2155 mutex_lock(&sbi->s_alloc_mutex); 2156 ret = uniqueID = le64_to_cpu(lvhd->uniqueID); 2157 if (!(++uniqueID & 0xFFFFFFFF)) 2158 uniqueID += 16; 2159 lvhd->uniqueID = cpu_to_le64(uniqueID); 2160 udf_updated_lvid(sb); 2161 mutex_unlock(&sbi->s_alloc_mutex); 2162 2163 return ret; 2164 } 2165 2166 static int udf_fill_super(struct super_block *sb, struct fs_context *fc) 2167 { 2168 int ret = -EINVAL; 2169 struct inode *inode = NULL; 2170 struct udf_options *uopt = fc->fs_private; 2171 struct kernel_lb_addr rootdir, fileset; 2172 struct udf_sb_info *sbi; 2173 bool lvid_open = false; 2174 int silent = fc->sb_flags & SB_SILENT; 2175 2176 sbi = kzalloc_obj(*sbi); 2177 if (!sbi) 2178 return -ENOMEM; 2179 2180 sb->s_fs_info = sbi; 2181 2182 mutex_init(&sbi->s_alloc_mutex); 2183 2184 fileset.logicalBlockNum = 0xFFFFFFFF; 2185 fileset.partitionReferenceNum = 0xFFFF; 2186 2187 sbi->s_flags = uopt->flags; 2188 sbi->s_uid = uopt->uid; 2189 sbi->s_gid = uopt->gid; 2190 sbi->s_umask = uopt->umask; 2191 sbi->s_fmode = uopt->fmode; 2192 sbi->s_dmode = uopt->dmode; 2193 sbi->s_nls_map = uopt->nls_map; 2194 uopt->nls_map = NULL; 2195 rwlock_init(&sbi->s_cred_lock); 2196 2197 if (uopt->session == 0xFFFFFFFF) 2198 sbi->s_session = udf_get_last_session(sb); 2199 else 2200 sbi->s_session = uopt->session; 2201 2202 udf_debug("Multi-session=%d\n", sbi->s_session); 2203 2204 /* Fill in the rest of the superblock */ 2205 sb->s_op = &udf_sb_ops; 2206 sb->s_export_op = &udf_export_ops; 2207 2208 sb->s_magic = UDF_SUPER_MAGIC; 2209 sb->s_time_gran = 1000; 2210 2211 if (uopt->flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) { 2212 ret = udf_load_vrs(sb, uopt, silent, &fileset); 2213 } else { 2214 uopt->blocksize = bdev_logical_block_size(sb->s_bdev); 2215 while (uopt->blocksize <= 4096) { 2216 ret = udf_load_vrs(sb, uopt, silent, &fileset); 2217 if (ret < 0) { 2218 if (!silent && ret != -EACCES) { 2219 pr_notice("Scanning with blocksize %u failed\n", 2220 uopt->blocksize); 2221 } 2222 brelse(sbi->s_lvid_bh); 2223 sbi->s_lvid_bh = NULL; 2224 /* 2225 * EACCES is special - we want to propagate to 2226 * upper layers that we cannot handle RW mount. 2227 */ 2228 if (ret == -EACCES) 2229 break; 2230 } else 2231 break; 2232 2233 uopt->blocksize <<= 1; 2234 } 2235 } 2236 if (ret < 0) { 2237 if (ret == -EAGAIN) { 2238 udf_warn(sb, "No partition found (1)\n"); 2239 ret = -EINVAL; 2240 } 2241 goto error_out; 2242 } 2243 2244 udf_debug("Lastblock=%u\n", sbi->s_last_block); 2245 2246 if (sbi->s_lvid_bh) { 2247 struct logicalVolIntegrityDescImpUse *lvidiu = 2248 udf_sb_lvidiu(sb); 2249 uint16_t minUDFReadRev; 2250 uint16_t minUDFWriteRev; 2251 2252 if (!lvidiu) { 2253 ret = -EINVAL; 2254 goto error_out; 2255 } 2256 minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev); 2257 minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev); 2258 if (minUDFReadRev > UDF_MAX_READ_VERSION) { 2259 udf_err(sb, "minUDFReadRev=%x (max is %x)\n", 2260 minUDFReadRev, 2261 UDF_MAX_READ_VERSION); 2262 ret = -EINVAL; 2263 goto error_out; 2264 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION) { 2265 if (!sb_rdonly(sb)) { 2266 ret = -EACCES; 2267 goto error_out; 2268 } 2269 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT); 2270 } 2271 2272 sbi->s_udfrev = minUDFWriteRev; 2273 2274 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE) 2275 UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE); 2276 if (minUDFReadRev >= UDF_VERS_USE_STREAMS) 2277 UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS); 2278 } 2279 2280 if (!sbi->s_partitions) { 2281 udf_warn(sb, "No partition found (2)\n"); 2282 ret = -EINVAL; 2283 goto error_out; 2284 } 2285 2286 if (sbi->s_partmaps[sbi->s_partition].s_partition_flags & 2287 UDF_PART_FLAG_READ_ONLY) { 2288 if (!sb_rdonly(sb)) { 2289 ret = -EACCES; 2290 goto error_out; 2291 } 2292 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT); 2293 } 2294 2295 ret = udf_find_fileset(sb, &fileset, &rootdir); 2296 if (ret < 0) { 2297 udf_warn(sb, "No fileset found\n"); 2298 goto error_out; 2299 } 2300 2301 if (!silent) { 2302 struct timestamp ts; 2303 udf_time_to_disk_stamp(&ts, sbi->s_record_time); 2304 udf_info("Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n", 2305 sbi->s_volume_ident, 2306 le16_to_cpu(ts.year), ts.month, ts.day, 2307 ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone)); 2308 } 2309 if (!sb_rdonly(sb)) { 2310 udf_open_lvid(sb); 2311 lvid_open = true; 2312 } 2313 2314 /* Assign the root inode */ 2315 /* assign inodes by physical block number */ 2316 /* perhaps it's not extensible enough, but for now ... */ 2317 inode = udf_iget(sb, &rootdir); 2318 if (IS_ERR(inode)) { 2319 udf_err(sb, "Error in udf_iget, block=%u, partition=%u\n", 2320 rootdir.logicalBlockNum, rootdir.partitionReferenceNum); 2321 ret = PTR_ERR(inode); 2322 goto error_out; 2323 } 2324 2325 /* Allocate a dentry for the root inode */ 2326 sb->s_root = d_make_root(inode); 2327 if (!sb->s_root) { 2328 udf_err(sb, "Couldn't allocate root dentry\n"); 2329 ret = -ENOMEM; 2330 goto error_out; 2331 } 2332 sb->s_maxbytes = UDF_MAX_FILESIZE; 2333 sb->s_max_links = UDF_MAX_LINKS; 2334 return 0; 2335 2336 error_out: 2337 iput(sbi->s_vat_inode); 2338 unload_nls(sbi->s_nls_map); 2339 if (lvid_open) 2340 udf_close_lvid(sb); 2341 brelse(sbi->s_lvid_bh); 2342 udf_sb_free_partitions(sb); 2343 kfree(sbi); 2344 sb->s_fs_info = NULL; 2345 2346 return ret; 2347 } 2348 2349 void _udf_err(struct super_block *sb, const char *function, 2350 const char *fmt, ...) 2351 { 2352 struct va_format vaf; 2353 va_list args; 2354 2355 va_start(args, fmt); 2356 2357 vaf.fmt = fmt; 2358 vaf.va = &args; 2359 2360 pr_err("error (device %s): %s: %pV", sb->s_id, function, &vaf); 2361 2362 va_end(args); 2363 } 2364 2365 void _udf_warn(struct super_block *sb, const char *function, 2366 const char *fmt, ...) 2367 { 2368 struct va_format vaf; 2369 va_list args; 2370 2371 va_start(args, fmt); 2372 2373 vaf.fmt = fmt; 2374 vaf.va = &args; 2375 2376 pr_warn("warning (device %s): %s: %pV", sb->s_id, function, &vaf); 2377 2378 va_end(args); 2379 } 2380 2381 static void udf_put_super(struct super_block *sb) 2382 { 2383 struct udf_sb_info *sbi; 2384 2385 sbi = UDF_SB(sb); 2386 2387 iput(sbi->s_vat_inode); 2388 unload_nls(sbi->s_nls_map); 2389 if (!sb_rdonly(sb)) 2390 udf_close_lvid(sb); 2391 brelse(sbi->s_lvid_bh); 2392 udf_sb_free_partitions(sb); 2393 mutex_destroy(&sbi->s_alloc_mutex); 2394 kfree(sb->s_fs_info); 2395 sb->s_fs_info = NULL; 2396 } 2397 2398 static int udf_sync_fs(struct super_block *sb, int wait) 2399 { 2400 struct udf_sb_info *sbi = UDF_SB(sb); 2401 2402 mutex_lock(&sbi->s_alloc_mutex); 2403 if (sbi->s_lvid_dirty) { 2404 struct buffer_head *bh = sbi->s_lvid_bh; 2405 struct logicalVolIntegrityDesc *lvid; 2406 2407 lvid = (struct logicalVolIntegrityDesc *)bh->b_data; 2408 udf_finalize_lvid(lvid); 2409 2410 /* 2411 * Blockdevice will be synced later so we don't have to submit 2412 * the buffer for IO 2413 */ 2414 mark_buffer_dirty(bh); 2415 sbi->s_lvid_dirty = 0; 2416 } 2417 mutex_unlock(&sbi->s_alloc_mutex); 2418 2419 return 0; 2420 } 2421 2422 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf) 2423 { 2424 struct super_block *sb = dentry->d_sb; 2425 struct udf_sb_info *sbi = UDF_SB(sb); 2426 struct logicalVolIntegrityDescImpUse *lvidiu; 2427 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 2428 2429 lvidiu = udf_sb_lvidiu(sb); 2430 buf->f_type = UDF_SUPER_MAGIC; 2431 buf->f_bsize = sb->s_blocksize; 2432 buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len; 2433 buf->f_bfree = udf_count_free(sb); 2434 buf->f_bavail = buf->f_bfree; 2435 /* 2436 * Let's pretend each free block is also a free 'inode' since UDF does 2437 * not have separate preallocated table of inodes. 2438 */ 2439 buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) + 2440 le32_to_cpu(lvidiu->numDirs)) : 0) 2441 + buf->f_bfree; 2442 buf->f_ffree = buf->f_bfree; 2443 buf->f_namelen = UDF_NAME_LEN; 2444 buf->f_fsid = u64_to_fsid(id); 2445 2446 return 0; 2447 } 2448 2449 static unsigned int udf_count_free_bitmap(struct super_block *sb, 2450 struct udf_bitmap *bitmap) 2451 { 2452 struct buffer_head *bh = NULL; 2453 unsigned int accum = 0; 2454 int index; 2455 udf_pblk_t block = 0, newblock; 2456 struct kernel_lb_addr loc; 2457 uint32_t bytes; 2458 uint8_t *ptr; 2459 uint16_t ident; 2460 struct spaceBitmapDesc *bm; 2461 2462 loc.logicalBlockNum = bitmap->s_extPosition; 2463 loc.partitionReferenceNum = UDF_SB(sb)->s_partition; 2464 bh = udf_read_ptagged(sb, &loc, 0, &ident); 2465 2466 if (!bh) { 2467 udf_err(sb, "udf_count_free failed\n"); 2468 goto out; 2469 } else if (ident != TAG_IDENT_SBD) { 2470 brelse(bh); 2471 udf_err(sb, "udf_count_free failed\n"); 2472 goto out; 2473 } 2474 2475 bm = (struct spaceBitmapDesc *)bh->b_data; 2476 bytes = le32_to_cpu(bm->numOfBytes); 2477 index = sizeof(struct spaceBitmapDesc); /* offset in first block only */ 2478 ptr = (uint8_t *)bh->b_data; 2479 2480 while (bytes > 0) { 2481 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index); 2482 accum += bitmap_weight((const unsigned long *)(ptr + index), 2483 cur_bytes * 8); 2484 bytes -= cur_bytes; 2485 if (bytes) { 2486 brelse(bh); 2487 newblock = udf_get_lb_pblock(sb, &loc, ++block); 2488 bh = sb_bread(sb, newblock); 2489 if (!bh) { 2490 udf_debug("read failed\n"); 2491 goto out; 2492 } 2493 index = 0; 2494 ptr = (uint8_t *)bh->b_data; 2495 } 2496 } 2497 brelse(bh); 2498 out: 2499 return accum; 2500 } 2501 2502 static unsigned int udf_count_free_table(struct super_block *sb, 2503 struct inode *table) 2504 { 2505 unsigned int accum = 0; 2506 uint32_t elen; 2507 struct kernel_lb_addr eloc; 2508 struct extent_position epos; 2509 int8_t etype; 2510 2511 mutex_lock(&UDF_SB(sb)->s_alloc_mutex); 2512 epos.block = UDF_I(table)->i_location; 2513 epos.offset = sizeof(struct unallocSpaceEntry); 2514 epos.bh = NULL; 2515 2516 while (udf_next_aext(table, &epos, &eloc, &elen, &etype, 1) > 0) 2517 accum += (elen >> table->i_sb->s_blocksize_bits); 2518 2519 brelse(epos.bh); 2520 mutex_unlock(&UDF_SB(sb)->s_alloc_mutex); 2521 2522 return accum; 2523 } 2524 2525 static unsigned int udf_count_free(struct super_block *sb) 2526 { 2527 unsigned int accum = 0; 2528 struct udf_sb_info *sbi = UDF_SB(sb); 2529 struct udf_part_map *map; 2530 unsigned int part = sbi->s_partition; 2531 int ptype = sbi->s_partmaps[part].s_partition_type; 2532 2533 if (ptype == UDF_METADATA_MAP25) { 2534 part = sbi->s_partmaps[part].s_type_specific.s_metadata. 2535 s_phys_partition_ref; 2536 } else if (ptype == UDF_VIRTUAL_MAP15 || ptype == UDF_VIRTUAL_MAP20) { 2537 /* 2538 * Filesystems with VAT are append-only and we cannot write to 2539 * them. Let's just report 0 here. 2540 */ 2541 return 0; 2542 } 2543 2544 if (sbi->s_lvid_bh) { 2545 struct logicalVolIntegrityDesc *lvid = 2546 (struct logicalVolIntegrityDesc *) 2547 sbi->s_lvid_bh->b_data; 2548 if (le32_to_cpu(lvid->numOfPartitions) > part) { 2549 accum = le32_to_cpu( 2550 lvid->freeSpaceTable[part]); 2551 if (accum == 0xFFFFFFFF) 2552 accum = 0; 2553 } 2554 } 2555 2556 if (accum) 2557 return accum; 2558 2559 map = &sbi->s_partmaps[part]; 2560 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) { 2561 accum += udf_count_free_bitmap(sb, 2562 map->s_uspace.s_bitmap); 2563 } 2564 if (accum) 2565 return accum; 2566 2567 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) { 2568 accum += udf_count_free_table(sb, 2569 map->s_uspace.s_table); 2570 } 2571 return accum; 2572 } 2573 2574 MODULE_AUTHOR("Ben Fennema"); 2575 MODULE_DESCRIPTION("Universal Disk Format Filesystem"); 2576 MODULE_LICENSE("GPL"); 2577 module_init(init_udf_fs) 2578 module_exit(exit_udf_fs) 2579