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 .sync_inode_metadata = udf_sync_inode_metadata, 215 .evict_inode = udf_evict_inode, 216 .put_super = udf_put_super, 217 .sync_fs = udf_sync_fs, 218 .statfs = udf_statfs, 219 .show_options = udf_show_options, 220 }; 221 222 struct udf_options { 223 unsigned int blocksize; 224 unsigned int session; 225 unsigned int lastblock; 226 unsigned int anchor; 227 unsigned int flags; 228 umode_t umask; 229 kgid_t gid; 230 kuid_t uid; 231 umode_t fmode; 232 umode_t dmode; 233 struct nls_table *nls_map; 234 }; 235 236 /* 237 * UDF has historically preserved prior mount options across 238 * a remount, so copy those here if remounting, otherwise set 239 * initial mount defaults. 240 */ 241 static void udf_init_options(struct fs_context *fc, struct udf_options *uopt) 242 { 243 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) { 244 struct super_block *sb = fc->root->d_sb; 245 struct udf_sb_info *sbi = UDF_SB(sb); 246 247 uopt->flags = sbi->s_flags; 248 uopt->uid = sbi->s_uid; 249 uopt->gid = sbi->s_gid; 250 uopt->umask = sbi->s_umask; 251 uopt->fmode = sbi->s_fmode; 252 uopt->dmode = sbi->s_dmode; 253 uopt->nls_map = NULL; 254 } else { 255 uopt->flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | 256 (1 << UDF_FLAG_STRICT); 257 /* 258 * By default we'll use overflow[ug]id when UDF 259 * inode [ug]id == -1 260 */ 261 uopt->uid = make_kuid(current_user_ns(), overflowuid); 262 uopt->gid = make_kgid(current_user_ns(), overflowgid); 263 uopt->umask = 0; 264 uopt->fmode = UDF_INVALID_MODE; 265 uopt->dmode = UDF_INVALID_MODE; 266 uopt->nls_map = NULL; 267 uopt->session = 0xFFFFFFFF; 268 } 269 } 270 271 static int udf_init_fs_context(struct fs_context *fc) 272 { 273 struct udf_options *uopt; 274 275 uopt = kzalloc_obj(*uopt); 276 if (!uopt) 277 return -ENOMEM; 278 279 udf_init_options(fc, uopt); 280 281 fc->fs_private = uopt; 282 fc->ops = &udf_context_ops; 283 284 return 0; 285 } 286 287 static void udf_free_fc(struct fs_context *fc) 288 { 289 struct udf_options *uopt = fc->fs_private; 290 291 unload_nls(uopt->nls_map); 292 kfree(fc->fs_private); 293 } 294 295 static int __init init_udf_fs(void) 296 { 297 int err; 298 299 err = init_inodecache(); 300 if (err) 301 goto out1; 302 err = register_filesystem(&udf_fstype); 303 if (err) 304 goto out; 305 306 return 0; 307 308 out: 309 destroy_inodecache(); 310 311 out1: 312 return err; 313 } 314 315 static void __exit exit_udf_fs(void) 316 { 317 unregister_filesystem(&udf_fstype); 318 destroy_inodecache(); 319 } 320 321 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count) 322 { 323 struct udf_sb_info *sbi = UDF_SB(sb); 324 325 sbi->s_partmaps = kzalloc_objs(*sbi->s_partmaps, count); 326 if (!sbi->s_partmaps) { 327 sbi->s_partitions = 0; 328 return -ENOMEM; 329 } 330 331 sbi->s_partitions = count; 332 return 0; 333 } 334 335 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap) 336 { 337 int i; 338 int nr_groups = bitmap->s_nr_groups; 339 340 for (i = 0; i < nr_groups; i++) 341 if (!IS_ERR_OR_NULL(bitmap->s_block_bitmap[i])) 342 brelse(bitmap->s_block_bitmap[i]); 343 344 kvfree(bitmap); 345 } 346 347 static void udf_free_partition(struct udf_part_map *map) 348 { 349 int i; 350 struct udf_meta_data *mdata; 351 352 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) 353 iput(map->s_uspace.s_table); 354 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) 355 udf_sb_free_bitmap(map->s_uspace.s_bitmap); 356 if (map->s_partition_type == UDF_SPARABLE_MAP15) 357 for (i = 0; i < 4; i++) 358 brelse(map->s_type_specific.s_sparing.s_spar_map[i]); 359 else if (map->s_partition_type == UDF_METADATA_MAP25) { 360 mdata = &map->s_type_specific.s_metadata; 361 iput(mdata->s_metadata_fe); 362 mdata->s_metadata_fe = NULL; 363 364 iput(mdata->s_mirror_fe); 365 mdata->s_mirror_fe = NULL; 366 367 iput(mdata->s_bitmap_fe); 368 mdata->s_bitmap_fe = NULL; 369 } 370 } 371 372 static void udf_sb_free_partitions(struct super_block *sb) 373 { 374 struct udf_sb_info *sbi = UDF_SB(sb); 375 int i; 376 377 if (!sbi->s_partmaps) 378 return; 379 for (i = 0; i < sbi->s_partitions; i++) 380 udf_free_partition(&sbi->s_partmaps[i]); 381 kfree(sbi->s_partmaps); 382 sbi->s_partmaps = NULL; 383 } 384 385 static int udf_show_options(struct seq_file *seq, struct dentry *root) 386 { 387 struct super_block *sb = root->d_sb; 388 struct udf_sb_info *sbi = UDF_SB(sb); 389 390 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT)) 391 seq_puts(seq, ",nostrict"); 392 if (UDF_QUERY_FLAG(sb, UDF_FLAG_BLOCKSIZE_SET)) 393 seq_printf(seq, ",bs=%lu", sb->s_blocksize); 394 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE)) 395 seq_puts(seq, ",unhide"); 396 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE)) 397 seq_puts(seq, ",undelete"); 398 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB)) 399 seq_puts(seq, ",noadinicb"); 400 if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD)) 401 seq_puts(seq, ",shortad"); 402 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET)) 403 seq_puts(seq, ",uid=forget"); 404 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET)) 405 seq_puts(seq, ",gid=forget"); 406 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET)) 407 seq_printf(seq, ",uid=%u", from_kuid(&init_user_ns, sbi->s_uid)); 408 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET)) 409 seq_printf(seq, ",gid=%u", from_kgid(&init_user_ns, sbi->s_gid)); 410 if (sbi->s_umask != 0) 411 seq_printf(seq, ",umask=%ho", sbi->s_umask); 412 if (sbi->s_fmode != UDF_INVALID_MODE) 413 seq_printf(seq, ",mode=%ho", sbi->s_fmode); 414 if (sbi->s_dmode != UDF_INVALID_MODE) 415 seq_printf(seq, ",dmode=%ho", sbi->s_dmode); 416 if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET)) 417 seq_printf(seq, ",session=%d", sbi->s_session); 418 if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET)) 419 seq_printf(seq, ",lastblock=%u", sbi->s_last_block); 420 if (sbi->s_anchor != 0) 421 seq_printf(seq, ",anchor=%u", sbi->s_anchor); 422 if (sbi->s_nls_map) 423 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset); 424 else 425 seq_puts(seq, ",iocharset=utf8"); 426 427 return 0; 428 } 429 430 /* 431 * udf_parse_param 432 * 433 * PURPOSE 434 * Parse mount options. 435 * 436 * DESCRIPTION 437 * The following mount options are supported: 438 * 439 * gid= Set the default group. 440 * umask= Set the default umask. 441 * mode= Set the default file permissions. 442 * dmode= Set the default directory permissions. 443 * uid= Set the default user. 444 * bs= Set the block size. 445 * unhide Show otherwise hidden files. 446 * undelete Show deleted files in lists. 447 * adinicb Embed data in the inode (default) 448 * noadinicb Don't embed data in the inode 449 * shortad Use short ad's 450 * longad Use long ad's (default) 451 * nostrict Unset strict conformance 452 * iocharset= Set the NLS character set 453 * 454 * The remaining are for debugging and disaster recovery: 455 * 456 * novrs Skip volume sequence recognition 457 * 458 * The following expect a offset from 0. 459 * 460 * session= Set the CDROM session (default= last session) 461 * anchor= Override standard anchor location. (default= 256) 462 * volume= Override the VolumeDesc location. (unused) 463 * partition= Override the PartitionDesc location. (unused) 464 * lastblock= Set the last block of the filesystem/ 465 * 466 * The following expect a offset from the partition root. 467 * 468 * fileset= Override the fileset block location. (unused) 469 * rootdir= Override the root directory location. (unused) 470 * WARNING: overriding the rootdir to a non-directory may 471 * yield highly unpredictable results. 472 * 473 * PRE-CONDITIONS 474 * fc fs_context with pointer to mount options variable. 475 * param Pointer to fs_parameter being parsed. 476 * 477 * POST-CONDITIONS 478 * <return> 0 Mount options parsed okay. 479 * <return> errno Error parsing mount options. 480 * 481 * HISTORY 482 * July 1, 1997 - Andrew E. Mileski 483 * Written, tested, and released. 484 */ 485 486 enum { 487 Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete, 488 Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad, 489 Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock, 490 Opt_anchor, Opt_volume, Opt_partition, Opt_fileset, 491 Opt_rootdir, Opt_utf8, Opt_iocharset, Opt_err, Opt_fmode, Opt_dmode 492 }; 493 494 static const struct fs_parameter_spec udf_param_spec[] = { 495 fsparam_flag ("novrs", Opt_novrs), 496 fsparam_flag ("nostrict", Opt_nostrict), 497 fsparam_u32 ("bs", Opt_bs), 498 fsparam_flag ("unhide", Opt_unhide), 499 fsparam_flag ("undelete", Opt_undelete), 500 fsparam_flag_no ("adinicb", Opt_adinicb), 501 fsparam_flag ("shortad", Opt_shortad), 502 fsparam_flag ("longad", Opt_longad), 503 fsparam_string ("gid", Opt_gid), 504 fsparam_string ("uid", Opt_uid), 505 fsparam_u32 ("umask", Opt_umask), 506 fsparam_u32 ("session", Opt_session), 507 fsparam_u32 ("lastblock", Opt_lastblock), 508 fsparam_u32 ("anchor", Opt_anchor), 509 fsparam_u32 ("volume", Opt_volume), 510 fsparam_u32 ("partition", Opt_partition), 511 fsparam_u32 ("fileset", Opt_fileset), 512 fsparam_u32 ("rootdir", Opt_rootdir), 513 fsparam_flag ("utf8", Opt_utf8), 514 fsparam_string ("iocharset", Opt_iocharset), 515 fsparam_u32 ("mode", Opt_fmode), 516 fsparam_u32 ("dmode", Opt_dmode), 517 {} 518 }; 519 520 static int udf_parse_param(struct fs_context *fc, struct fs_parameter *param) 521 { 522 unsigned int uv; 523 unsigned int n; 524 struct udf_options *uopt = fc->fs_private; 525 struct fs_parse_result result; 526 int token; 527 bool remount = (fc->purpose & FS_CONTEXT_FOR_RECONFIGURE); 528 529 token = fs_parse(fc, udf_param_spec, param, &result); 530 if (token < 0) 531 return token; 532 533 switch (token) { 534 case Opt_novrs: 535 uopt->flags |= (1 << UDF_FLAG_NOVRS); 536 break; 537 case Opt_bs: 538 n = result.uint_32; 539 if (n != 512 && n != 1024 && n != 2048 && n != 4096) 540 return -EINVAL; 541 uopt->blocksize = n; 542 uopt->flags |= (1 << UDF_FLAG_BLOCKSIZE_SET); 543 break; 544 case Opt_unhide: 545 uopt->flags |= (1 << UDF_FLAG_UNHIDE); 546 break; 547 case Opt_undelete: 548 uopt->flags |= (1 << UDF_FLAG_UNDELETE); 549 break; 550 case Opt_adinicb: 551 if (result.negated) 552 uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB); 553 else 554 uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB); 555 break; 556 case Opt_shortad: 557 uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD); 558 break; 559 case Opt_longad: 560 uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD); 561 break; 562 case Opt_gid: 563 if (kstrtoint(param->string, 10, &uv) == 0) { 564 kgid_t gid = make_kgid(current_user_ns(), uv); 565 if (!gid_valid(gid)) 566 return -EINVAL; 567 uopt->gid = gid; 568 uopt->flags |= (1 << UDF_FLAG_GID_SET); 569 } else if (!strcmp(param->string, "forget")) { 570 uopt->flags |= (1 << UDF_FLAG_GID_FORGET); 571 } else if (!strcmp(param->string, "ignore")) { 572 /* this option is superseded by gid=<number> */ 573 ; 574 } else { 575 return -EINVAL; 576 } 577 break; 578 case Opt_uid: 579 if (kstrtoint(param->string, 10, &uv) == 0) { 580 kuid_t uid = make_kuid(current_user_ns(), uv); 581 if (!uid_valid(uid)) 582 return -EINVAL; 583 uopt->uid = uid; 584 uopt->flags |= (1 << UDF_FLAG_UID_SET); 585 } else if (!strcmp(param->string, "forget")) { 586 uopt->flags |= (1 << UDF_FLAG_UID_FORGET); 587 } else if (!strcmp(param->string, "ignore")) { 588 /* this option is superseded by uid=<number> */ 589 ; 590 } else { 591 return -EINVAL; 592 } 593 break; 594 case Opt_umask: 595 uopt->umask = result.uint_32; 596 break; 597 case Opt_nostrict: 598 uopt->flags &= ~(1 << UDF_FLAG_STRICT); 599 break; 600 case Opt_session: 601 uopt->session = result.uint_32; 602 if (!remount) 603 uopt->flags |= (1 << UDF_FLAG_SESSION_SET); 604 break; 605 case Opt_lastblock: 606 uopt->lastblock = result.uint_32; 607 if (!remount) 608 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET); 609 break; 610 case Opt_anchor: 611 uopt->anchor = result.uint_32; 612 break; 613 case Opt_volume: 614 case Opt_partition: 615 case Opt_fileset: 616 case Opt_rootdir: 617 /* Ignored (never implemented properly) */ 618 break; 619 case Opt_utf8: 620 if (!remount) { 621 unload_nls(uopt->nls_map); 622 uopt->nls_map = NULL; 623 } 624 break; 625 case Opt_iocharset: 626 if (!remount) { 627 unload_nls(uopt->nls_map); 628 uopt->nls_map = NULL; 629 } 630 /* When nls_map is not loaded then UTF-8 is used */ 631 if (!remount && strcmp(param->string, "utf8") != 0) { 632 uopt->nls_map = load_nls(param->string); 633 if (!uopt->nls_map) { 634 errorf(fc, "iocharset %s not found", 635 param->string); 636 return -EINVAL; 637 } 638 } 639 break; 640 case Opt_fmode: 641 uopt->fmode = result.uint_32 & 0777; 642 break; 643 case Opt_dmode: 644 uopt->dmode = result.uint_32 & 0777; 645 break; 646 default: 647 return -EINVAL; 648 } 649 return 0; 650 } 651 652 static int udf_reconfigure(struct fs_context *fc) 653 { 654 struct udf_options *uopt = fc->fs_private; 655 struct super_block *sb = fc->root->d_sb; 656 struct udf_sb_info *sbi = UDF_SB(sb); 657 int readonly = fc->sb_flags & SB_RDONLY; 658 int error = 0; 659 660 if (!readonly && UDF_QUERY_FLAG(sb, UDF_FLAG_RW_INCOMPAT)) 661 return -EACCES; 662 663 sync_filesystem(sb); 664 665 write_lock(&sbi->s_cred_lock); 666 sbi->s_flags = uopt->flags; 667 sbi->s_uid = uopt->uid; 668 sbi->s_gid = uopt->gid; 669 sbi->s_umask = uopt->umask; 670 sbi->s_fmode = uopt->fmode; 671 sbi->s_dmode = uopt->dmode; 672 write_unlock(&sbi->s_cred_lock); 673 674 if (readonly == sb_rdonly(sb)) 675 goto out_unlock; 676 677 if (readonly) 678 udf_close_lvid(sb); 679 else 680 udf_open_lvid(sb); 681 682 out_unlock: 683 return error; 684 } 685 686 /* 687 * Check VSD descriptor. Returns -1 in case we are at the end of volume 688 * recognition area, 0 if the descriptor is valid but non-interesting, 1 if 689 * we found one of NSR descriptors we are looking for. 690 */ 691 static int identify_vsd(const struct volStructDesc *vsd) 692 { 693 int ret = 0; 694 695 if (!memcmp(vsd->stdIdent, VSD_STD_ID_CD001, VSD_STD_ID_LEN)) { 696 switch (vsd->structType) { 697 case 0: 698 udf_debug("ISO9660 Boot Record found\n"); 699 break; 700 case 1: 701 udf_debug("ISO9660 Primary Volume Descriptor found\n"); 702 break; 703 case 2: 704 udf_debug("ISO9660 Supplementary Volume Descriptor found\n"); 705 break; 706 case 3: 707 udf_debug("ISO9660 Volume Partition Descriptor found\n"); 708 break; 709 case 255: 710 udf_debug("ISO9660 Volume Descriptor Set Terminator found\n"); 711 break; 712 default: 713 udf_debug("ISO9660 VRS (%u) found\n", vsd->structType); 714 break; 715 } 716 } else if (!memcmp(vsd->stdIdent, VSD_STD_ID_BEA01, VSD_STD_ID_LEN)) 717 ; /* ret = 0 */ 718 else if (!memcmp(vsd->stdIdent, VSD_STD_ID_NSR02, VSD_STD_ID_LEN)) 719 ret = 1; 720 else if (!memcmp(vsd->stdIdent, VSD_STD_ID_NSR03, VSD_STD_ID_LEN)) 721 ret = 1; 722 else if (!memcmp(vsd->stdIdent, VSD_STD_ID_BOOT2, VSD_STD_ID_LEN)) 723 ; /* ret = 0 */ 724 else if (!memcmp(vsd->stdIdent, VSD_STD_ID_CDW02, VSD_STD_ID_LEN)) 725 ; /* ret = 0 */ 726 else { 727 /* TEA01 or invalid id : end of volume recognition area */ 728 ret = -1; 729 } 730 731 return ret; 732 } 733 734 /* 735 * Check Volume Structure Descriptors (ECMA 167 2/9.1) 736 * We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) 737 * @return 1 if NSR02 or NSR03 found, 738 * -1 if first sector read error, 0 otherwise 739 */ 740 static int udf_check_vsd(struct super_block *sb) 741 { 742 struct volStructDesc *vsd = NULL; 743 loff_t sector = VSD_FIRST_SECTOR_OFFSET; 744 int sectorsize; 745 struct buffer_head *bh = NULL; 746 int nsr = 0; 747 struct udf_sb_info *sbi; 748 loff_t session_offset; 749 750 sbi = UDF_SB(sb); 751 if (sb->s_blocksize < sizeof(struct volStructDesc)) 752 sectorsize = sizeof(struct volStructDesc); 753 else 754 sectorsize = sb->s_blocksize; 755 756 session_offset = (loff_t)sbi->s_session << sb->s_blocksize_bits; 757 sector += session_offset; 758 759 udf_debug("Starting at sector %u (%lu byte sectors)\n", 760 (unsigned int)(sector >> sb->s_blocksize_bits), 761 sb->s_blocksize); 762 /* Process the sequence (if applicable). The hard limit on the sector 763 * offset is arbitrary, hopefully large enough so that all valid UDF 764 * filesystems will be recognised. There is no mention of an upper 765 * bound to the size of the volume recognition area in the standard. 766 * The limit will prevent the code to read all the sectors of a 767 * specially crafted image (like a bluray disc full of CD001 sectors), 768 * potentially causing minutes or even hours of uninterruptible I/O 769 * activity. This actually happened with uninitialised SSD partitions 770 * (all 0xFF) before the check for the limit and all valid IDs were 771 * added */ 772 for (; !nsr && sector < VSD_MAX_SECTOR_OFFSET; sector += sectorsize) { 773 /* Read a block */ 774 bh = sb_bread(sb, sector >> sb->s_blocksize_bits); 775 if (!bh) 776 break; 777 778 vsd = (struct volStructDesc *)(bh->b_data + 779 (sector & (sb->s_blocksize - 1))); 780 nsr = identify_vsd(vsd); 781 /* Found NSR or end? */ 782 if (nsr) { 783 brelse(bh); 784 break; 785 } 786 /* 787 * Special handling for improperly formatted VRS (e.g., Win10) 788 * where components are separated by 2048 bytes even though 789 * sectors are 4K 790 */ 791 if (sb->s_blocksize == 4096) { 792 nsr = identify_vsd(vsd + 1); 793 /* Ignore unknown IDs... */ 794 if (nsr < 0) 795 nsr = 0; 796 } 797 brelse(bh); 798 } 799 800 if (nsr > 0) 801 return 1; 802 else if (!bh && sector - session_offset == VSD_FIRST_SECTOR_OFFSET) 803 return -1; 804 else 805 return 0; 806 } 807 808 static int udf_verify_domain_identifier(struct super_block *sb, 809 struct regid *ident, char *dname) 810 { 811 struct domainIdentSuffix *suffix; 812 813 if (memcmp(ident->ident, UDF_ID_COMPLIANT, strlen(UDF_ID_COMPLIANT))) { 814 udf_warn(sb, "Not OSTA UDF compliant %s descriptor.\n", dname); 815 goto force_ro; 816 } 817 if (ident->flags & ENTITYID_FLAGS_DIRTY) { 818 udf_warn(sb, "Possibly not OSTA UDF compliant %s descriptor.\n", 819 dname); 820 goto force_ro; 821 } 822 suffix = (struct domainIdentSuffix *)ident->identSuffix; 823 if ((suffix->domainFlags & DOMAIN_FLAGS_HARD_WRITE_PROTECT) || 824 (suffix->domainFlags & DOMAIN_FLAGS_SOFT_WRITE_PROTECT)) { 825 if (!sb_rdonly(sb)) { 826 udf_warn(sb, "Descriptor for %s marked write protected." 827 " Forcing read only mount.\n", dname); 828 } 829 goto force_ro; 830 } 831 return 0; 832 833 force_ro: 834 if (!sb_rdonly(sb)) 835 return -EACCES; 836 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT); 837 return 0; 838 } 839 840 static int udf_load_fileset(struct super_block *sb, struct fileSetDesc *fset, 841 struct kernel_lb_addr *root) 842 { 843 int ret; 844 845 ret = udf_verify_domain_identifier(sb, &fset->domainIdent, "file set"); 846 if (ret < 0) 847 return ret; 848 849 *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation); 850 UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum); 851 852 udf_debug("Rootdir at block=%u, partition=%u\n", 853 root->logicalBlockNum, root->partitionReferenceNum); 854 return 0; 855 } 856 857 static int udf_find_fileset(struct super_block *sb, 858 struct kernel_lb_addr *fileset, 859 struct kernel_lb_addr *root) 860 { 861 struct buffer_head *bh; 862 uint16_t ident; 863 int ret; 864 865 if (fileset->logicalBlockNum == 0xFFFFFFFF && 866 fileset->partitionReferenceNum == 0xFFFF) 867 return -EINVAL; 868 869 bh = udf_read_ptagged(sb, fileset, 0, &ident); 870 if (!bh) 871 return -EIO; 872 if (ident != TAG_IDENT_FSD) { 873 brelse(bh); 874 return -EINVAL; 875 } 876 877 udf_debug("Fileset at block=%u, partition=%u\n", 878 fileset->logicalBlockNum, fileset->partitionReferenceNum); 879 880 UDF_SB(sb)->s_partition = fileset->partitionReferenceNum; 881 ret = udf_load_fileset(sb, (struct fileSetDesc *)bh->b_data, root); 882 brelse(bh); 883 return ret; 884 } 885 886 /* 887 * Load primary Volume Descriptor Sequence 888 * 889 * Return <0 on error, 0 on success. -EAGAIN is special meaning next sequence 890 * should be tried. 891 */ 892 static int udf_load_pvoldesc(struct super_block *sb, sector_t block) 893 { 894 struct primaryVolDesc *pvoldesc; 895 uint8_t *outstr; 896 struct buffer_head *bh; 897 uint16_t ident; 898 int ret; 899 struct timestamp *ts; 900 901 outstr = kzalloc(128, GFP_KERNEL); 902 if (!outstr) 903 return -ENOMEM; 904 905 bh = udf_read_tagged(sb, block, block, &ident); 906 if (!bh) { 907 ret = -EAGAIN; 908 goto out2; 909 } 910 911 if (ident != TAG_IDENT_PVD) { 912 ret = -EIO; 913 goto out_bh; 914 } 915 916 pvoldesc = (struct primaryVolDesc *)bh->b_data; 917 918 udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time, 919 pvoldesc->recordingDateAndTime); 920 ts = &pvoldesc->recordingDateAndTime; 921 udf_debug("recording time %04u/%02u/%02u %02u:%02u (%x)\n", 922 le16_to_cpu(ts->year), ts->month, ts->day, ts->hour, 923 ts->minute, le16_to_cpu(ts->typeAndTimezone)); 924 925 ret = udf_dstrCS0toChar(sb, outstr, 31, pvoldesc->volIdent, 32); 926 if (ret < 0) { 927 strscpy_pad(UDF_SB(sb)->s_volume_ident, "InvalidName"); 928 pr_warn("incorrect volume identification, setting to " 929 "'InvalidName'\n"); 930 } else { 931 strscpy_pad(UDF_SB(sb)->s_volume_ident, outstr); 932 } 933 udf_debug("volIdent[] = '%s'\n", UDF_SB(sb)->s_volume_ident); 934 935 ret = udf_dstrCS0toChar(sb, outstr, 127, pvoldesc->volSetIdent, 128); 936 if (ret < 0) { 937 ret = 0; 938 goto out_bh; 939 } 940 outstr[ret] = 0; 941 udf_debug("volSetIdent[] = '%s'\n", outstr); 942 943 ret = 0; 944 out_bh: 945 brelse(bh); 946 out2: 947 kfree(outstr); 948 return ret; 949 } 950 951 struct inode *udf_find_metadata_inode_efe(struct super_block *sb, 952 u32 meta_file_loc, u32 partition_ref) 953 { 954 struct kernel_lb_addr addr; 955 struct inode *metadata_fe; 956 957 addr.logicalBlockNum = meta_file_loc; 958 addr.partitionReferenceNum = partition_ref; 959 960 metadata_fe = udf_iget_special(sb, &addr); 961 962 if (IS_ERR(metadata_fe)) { 963 udf_warn(sb, "metadata inode efe not found\n"); 964 return metadata_fe; 965 } 966 if (UDF_I(metadata_fe)->i_alloc_type != ICBTAG_FLAG_AD_SHORT) { 967 udf_warn(sb, "metadata inode efe does not have short allocation descriptors!\n"); 968 iput(metadata_fe); 969 return ERR_PTR(-EIO); 970 } 971 972 return metadata_fe; 973 } 974 975 static int udf_load_metadata_files(struct super_block *sb, int partition, 976 int type1_index) 977 { 978 struct udf_sb_info *sbi = UDF_SB(sb); 979 struct udf_part_map *map; 980 struct udf_meta_data *mdata; 981 struct kernel_lb_addr addr; 982 struct inode *fe; 983 984 map = &sbi->s_partmaps[partition]; 985 mdata = &map->s_type_specific.s_metadata; 986 mdata->s_phys_partition_ref = type1_index; 987 988 /* metadata address */ 989 udf_debug("Metadata file location: block = %u part = %u\n", 990 mdata->s_meta_file_loc, mdata->s_phys_partition_ref); 991 992 fe = udf_find_metadata_inode_efe(sb, mdata->s_meta_file_loc, 993 mdata->s_phys_partition_ref); 994 if (IS_ERR(fe)) { 995 /* mirror file entry */ 996 udf_debug("Mirror metadata file location: block = %u part = %u\n", 997 mdata->s_mirror_file_loc, mdata->s_phys_partition_ref); 998 999 fe = udf_find_metadata_inode_efe(sb, mdata->s_mirror_file_loc, 1000 mdata->s_phys_partition_ref); 1001 1002 if (IS_ERR(fe)) { 1003 udf_err(sb, "Both metadata and mirror metadata inode efe can not found\n"); 1004 return PTR_ERR(fe); 1005 } 1006 mdata->s_mirror_fe = fe; 1007 } else 1008 mdata->s_metadata_fe = fe; 1009 1010 1011 /* 1012 * bitmap file entry 1013 * Note: 1014 * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102) 1015 */ 1016 if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) { 1017 addr.logicalBlockNum = mdata->s_bitmap_file_loc; 1018 addr.partitionReferenceNum = mdata->s_phys_partition_ref; 1019 1020 udf_debug("Bitmap file location: block = %u part = %u\n", 1021 addr.logicalBlockNum, addr.partitionReferenceNum); 1022 1023 fe = udf_iget_special(sb, &addr); 1024 if (IS_ERR(fe)) { 1025 if (sb_rdonly(sb)) 1026 udf_warn(sb, "bitmap inode efe not found but it's ok since the disc is mounted read-only\n"); 1027 else { 1028 udf_err(sb, "bitmap inode efe not found and attempted read-write mount\n"); 1029 return PTR_ERR(fe); 1030 } 1031 } else 1032 mdata->s_bitmap_fe = fe; 1033 } 1034 1035 udf_debug("udf_load_metadata_files Ok\n"); 1036 return 0; 1037 } 1038 1039 int udf_compute_nr_groups(struct super_block *sb, u32 partition) 1040 { 1041 struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition]; 1042 return DIV_ROUND_UP(map->s_partition_len + 1043 (sizeof(struct spaceBitmapDesc) << 3), 1044 sb->s_blocksize * 8); 1045 } 1046 1047 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index) 1048 { 1049 struct udf_bitmap *bitmap; 1050 int nr_groups = udf_compute_nr_groups(sb, index); 1051 1052 bitmap = kvzalloc_flex(*bitmap, s_block_bitmap, nr_groups); 1053 if (!bitmap) 1054 return NULL; 1055 1056 bitmap->s_nr_groups = nr_groups; 1057 return bitmap; 1058 } 1059 1060 static int check_partition_desc(struct super_block *sb, 1061 struct partitionDesc *p, 1062 struct udf_part_map *map) 1063 { 1064 bool umap, utable, fmap, ftable; 1065 struct partitionHeaderDesc *phd; 1066 1067 switch (le32_to_cpu(p->accessType)) { 1068 case PD_ACCESS_TYPE_READ_ONLY: 1069 case PD_ACCESS_TYPE_WRITE_ONCE: 1070 case PD_ACCESS_TYPE_NONE: 1071 goto force_ro; 1072 } 1073 1074 /* No Partition Header Descriptor? */ 1075 if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) && 1076 strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03)) 1077 goto force_ro; 1078 1079 phd = (struct partitionHeaderDesc *)p->partitionContentsUse; 1080 utable = phd->unallocSpaceTable.extLength; 1081 umap = phd->unallocSpaceBitmap.extLength; 1082 ftable = phd->freedSpaceTable.extLength; 1083 fmap = phd->freedSpaceBitmap.extLength; 1084 1085 /* No allocation info? */ 1086 if (!utable && !umap && !ftable && !fmap) 1087 goto force_ro; 1088 1089 /* We don't support blocks that require erasing before overwrite */ 1090 if (ftable || fmap) 1091 goto force_ro; 1092 /* UDF 2.60: 2.3.3 - no mixing of tables & bitmaps, no VAT. */ 1093 if (utable && umap) 1094 goto force_ro; 1095 1096 if (map->s_partition_type == UDF_VIRTUAL_MAP15 || 1097 map->s_partition_type == UDF_VIRTUAL_MAP20 || 1098 map->s_partition_type == UDF_METADATA_MAP25) 1099 goto force_ro; 1100 1101 return 0; 1102 force_ro: 1103 if (!sb_rdonly(sb)) 1104 return -EACCES; 1105 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT); 1106 return 0; 1107 } 1108 1109 static int udf_fill_partdesc_info(struct super_block *sb, 1110 struct partitionDesc *p, int p_index) 1111 { 1112 struct udf_part_map *map; 1113 struct udf_sb_info *sbi = UDF_SB(sb); 1114 struct partitionHeaderDesc *phd; 1115 u32 sum; 1116 int err; 1117 1118 map = &sbi->s_partmaps[p_index]; 1119 1120 map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */ 1121 map->s_partition_root = le32_to_cpu(p->partitionStartingLocation); 1122 if (check_add_overflow(map->s_partition_root, map->s_partition_len, 1123 &sum)) { 1124 udf_err(sb, "Partition %d has invalid location %u + %u\n", 1125 p_index, map->s_partition_root, map->s_partition_len); 1126 return -EFSCORRUPTED; 1127 } 1128 1129 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY)) 1130 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY; 1131 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE)) 1132 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE; 1133 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE)) 1134 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE; 1135 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE)) 1136 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE; 1137 1138 udf_debug("Partition (%d type %x) starts at physical %u, block length %u\n", 1139 p_index, map->s_partition_type, 1140 map->s_partition_root, map->s_partition_len); 1141 1142 err = check_partition_desc(sb, p, map); 1143 if (err) 1144 return err; 1145 1146 /* 1147 * Skip loading allocation info it we cannot ever write to the fs. 1148 * This is a correctness thing as we may have decided to force ro mount 1149 * to avoid allocation info we don't support. 1150 */ 1151 if (UDF_QUERY_FLAG(sb, UDF_FLAG_RW_INCOMPAT)) 1152 return 0; 1153 1154 phd = (struct partitionHeaderDesc *)p->partitionContentsUse; 1155 if (phd->unallocSpaceTable.extLength) { 1156 struct kernel_lb_addr loc = { 1157 .logicalBlockNum = le32_to_cpu( 1158 phd->unallocSpaceTable.extPosition), 1159 .partitionReferenceNum = p_index, 1160 }; 1161 struct inode *inode; 1162 1163 inode = udf_iget_special(sb, &loc); 1164 if (IS_ERR(inode)) { 1165 udf_debug("cannot load unallocSpaceTable (part %d)\n", 1166 p_index); 1167 return PTR_ERR(inode); 1168 } 1169 map->s_uspace.s_table = inode; 1170 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE; 1171 udf_debug("unallocSpaceTable (part %d) @ %llu\n", 1172 p_index, map->s_uspace.s_table->i_ino); 1173 } 1174 1175 if (phd->unallocSpaceBitmap.extLength) { 1176 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index); 1177 if (!bitmap) 1178 return -ENOMEM; 1179 map->s_uspace.s_bitmap = bitmap; 1180 bitmap->s_extPosition = le32_to_cpu( 1181 phd->unallocSpaceBitmap.extPosition); 1182 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP; 1183 /* Check whether math over bitmap won't overflow. */ 1184 if (check_add_overflow(map->s_partition_len, 1185 sizeof(struct spaceBitmapDesc) << 3, 1186 &sum)) { 1187 udf_err(sb, "Partition %d is too long (%u)\n", p_index, 1188 map->s_partition_len); 1189 return -EFSCORRUPTED; 1190 } 1191 udf_debug("unallocSpaceBitmap (part %d) @ %u\n", 1192 p_index, bitmap->s_extPosition); 1193 } 1194 1195 return 0; 1196 } 1197 1198 static void udf_find_vat_block(struct super_block *sb, int p_index, 1199 int type1_index, sector_t start_block) 1200 { 1201 struct udf_sb_info *sbi = UDF_SB(sb); 1202 struct udf_part_map *map = &sbi->s_partmaps[p_index]; 1203 sector_t vat_block; 1204 struct kernel_lb_addr ino; 1205 struct inode *inode; 1206 1207 /* 1208 * VAT file entry is in the last recorded block. Some broken disks have 1209 * it a few blocks before so try a bit harder... 1210 */ 1211 ino.partitionReferenceNum = type1_index; 1212 for (vat_block = start_block; 1213 vat_block >= map->s_partition_root && 1214 vat_block >= start_block - 3; vat_block--) { 1215 ino.logicalBlockNum = vat_block - map->s_partition_root; 1216 inode = udf_iget_special(sb, &ino); 1217 if (!IS_ERR(inode)) { 1218 sbi->s_vat_inode = inode; 1219 break; 1220 } 1221 } 1222 } 1223 1224 static int udf_load_vat(struct super_block *sb, int p_index, int type1_index) 1225 { 1226 struct udf_sb_info *sbi = UDF_SB(sb); 1227 struct udf_part_map *map = &sbi->s_partmaps[p_index]; 1228 struct buffer_head *bh = NULL; 1229 struct udf_inode_info *vati; 1230 struct virtualAllocationTable20 *vat20; 1231 sector_t blocks = sb_bdev_nr_blocks(sb); 1232 1233 udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block); 1234 if (!sbi->s_vat_inode && 1235 sbi->s_last_block != blocks - 1) { 1236 pr_notice("Failed to read VAT inode from the last recorded block (%lu), retrying with the last block of the device (%lu).\n", 1237 (unsigned long)sbi->s_last_block, 1238 (unsigned long)blocks - 1); 1239 udf_find_vat_block(sb, p_index, type1_index, blocks - 1); 1240 } 1241 if (!sbi->s_vat_inode) 1242 return -EIO; 1243 1244 if (map->s_partition_type == UDF_VIRTUAL_MAP15) { 1245 map->s_type_specific.s_virtual.s_start_offset = 0; 1246 if (sbi->s_vat_inode->i_size < 36) { 1247 udf_err(sb, "Too short VAT inode size %lld\n", 1248 sbi->s_vat_inode->i_size); 1249 return -EFSCORRUPTED; 1250 } 1251 map->s_type_specific.s_virtual.s_num_entries = 1252 (sbi->s_vat_inode->i_size - 36) >> 2; 1253 } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) { 1254 vati = UDF_I(sbi->s_vat_inode); 1255 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { 1256 int err = 0; 1257 1258 bh = udf_bread(sbi->s_vat_inode, 0, 0, &err); 1259 if (!bh) { 1260 if (!err) 1261 err = -EFSCORRUPTED; 1262 return err; 1263 } 1264 vat20 = (struct virtualAllocationTable20 *)bh->b_data; 1265 } else { 1266 vat20 = (struct virtualAllocationTable20 *) 1267 vati->i_data; 1268 } 1269 1270 map->s_type_specific.s_virtual.s_start_offset = 1271 le16_to_cpu(vat20->lengthHeader); 1272 if (map->s_type_specific.s_virtual.s_start_offset 1273 > sbi->s_vat_inode->i_size) { 1274 udf_err(sb, "Corrupted VAT header length %u (VAT inode size %lld)\n", 1275 map->s_type_specific.s_virtual.s_start_offset, 1276 sbi->s_vat_inode->i_size); 1277 brelse(bh); 1278 return -EFSCORRUPTED; 1279 } 1280 map->s_type_specific.s_virtual.s_num_entries = 1281 (sbi->s_vat_inode->i_size - 1282 map->s_type_specific.s_virtual. 1283 s_start_offset) >> 2; 1284 brelse(bh); 1285 } 1286 return 0; 1287 } 1288 1289 /* 1290 * Load partition descriptor block 1291 * 1292 * Returns <0 on error, 0 on success, -EAGAIN is special - try next descriptor 1293 * sequence. 1294 */ 1295 static int udf_load_partdesc(struct super_block *sb, sector_t block) 1296 { 1297 struct buffer_head *bh; 1298 struct partitionDesc *p; 1299 struct udf_part_map *map; 1300 struct udf_sb_info *sbi = UDF_SB(sb); 1301 int i, type1_idx; 1302 uint16_t partitionNumber; 1303 uint16_t ident; 1304 int ret; 1305 1306 bh = udf_read_tagged(sb, block, block, &ident); 1307 if (!bh) 1308 return -EAGAIN; 1309 if (ident != TAG_IDENT_PD) { 1310 ret = 0; 1311 goto out_bh; 1312 } 1313 1314 p = (struct partitionDesc *)bh->b_data; 1315 partitionNumber = le16_to_cpu(p->partitionNumber); 1316 1317 /* First scan for TYPE1 and SPARABLE partitions */ 1318 for (i = 0; i < sbi->s_partitions; i++) { 1319 map = &sbi->s_partmaps[i]; 1320 udf_debug("Searching map: (%u == %u)\n", 1321 map->s_partition_num, partitionNumber); 1322 if (map->s_partition_num == partitionNumber && 1323 (map->s_partition_type == UDF_TYPE1_MAP15 || 1324 map->s_partition_type == UDF_SPARABLE_MAP15)) 1325 break; 1326 } 1327 1328 if (i >= sbi->s_partitions) { 1329 udf_debug("Partition (%u) not found in partition map\n", 1330 partitionNumber); 1331 ret = 0; 1332 goto out_bh; 1333 } 1334 1335 ret = udf_fill_partdesc_info(sb, p, i); 1336 if (ret < 0) 1337 goto out_bh; 1338 1339 /* 1340 * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and 1341 * PHYSICAL partitions are already set up 1342 */ 1343 type1_idx = i; 1344 map = NULL; /* supress 'maybe used uninitialized' warning */ 1345 for (i = 0; i < sbi->s_partitions; i++) { 1346 map = &sbi->s_partmaps[i]; 1347 1348 if (map->s_partition_num == partitionNumber && 1349 (map->s_partition_type == UDF_VIRTUAL_MAP15 || 1350 map->s_partition_type == UDF_VIRTUAL_MAP20 || 1351 map->s_partition_type == UDF_METADATA_MAP25)) 1352 break; 1353 } 1354 1355 if (i >= sbi->s_partitions) { 1356 ret = 0; 1357 goto out_bh; 1358 } 1359 1360 ret = udf_fill_partdesc_info(sb, p, i); 1361 if (ret < 0) 1362 goto out_bh; 1363 1364 if (map->s_partition_type == UDF_METADATA_MAP25) { 1365 ret = udf_load_metadata_files(sb, i, type1_idx); 1366 if (ret < 0) { 1367 udf_err(sb, "error loading MetaData partition map %d\n", 1368 i); 1369 goto out_bh; 1370 } 1371 } else { 1372 /* 1373 * If we have a partition with virtual map, we don't handle 1374 * writing to it (we overwrite blocks instead of relocating 1375 * them). 1376 */ 1377 if (!sb_rdonly(sb)) { 1378 ret = -EACCES; 1379 goto out_bh; 1380 } 1381 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT); 1382 ret = udf_load_vat(sb, i, type1_idx); 1383 if (ret < 0) 1384 goto out_bh; 1385 } 1386 ret = 0; 1387 out_bh: 1388 /* In case loading failed, we handle cleanup in udf_fill_super */ 1389 brelse(bh); 1390 return ret; 1391 } 1392 1393 static int udf_load_sparable_map(struct super_block *sb, 1394 struct udf_part_map *map, 1395 struct sparablePartitionMap *spm) 1396 { 1397 uint32_t loc; 1398 uint16_t ident; 1399 struct sparingTable *st; 1400 struct udf_sparing_data *sdata = &map->s_type_specific.s_sparing; 1401 int i; 1402 struct buffer_head *bh; 1403 1404 map->s_partition_type = UDF_SPARABLE_MAP15; 1405 sdata->s_packet_len = le16_to_cpu(spm->packetLength); 1406 if (!is_power_of_2(sdata->s_packet_len)) { 1407 udf_err(sb, "error loading logical volume descriptor: " 1408 "Invalid packet length %u\n", 1409 (unsigned)sdata->s_packet_len); 1410 return -EIO; 1411 } 1412 if (spm->numSparingTables > 4) { 1413 udf_err(sb, "error loading logical volume descriptor: " 1414 "Too many sparing tables (%d)\n", 1415 (int)spm->numSparingTables); 1416 return -EIO; 1417 } 1418 if (le32_to_cpu(spm->sizeSparingTable) > sb->s_blocksize) { 1419 udf_err(sb, "error loading logical volume descriptor: " 1420 "Too big sparing table size (%u)\n", 1421 le32_to_cpu(spm->sizeSparingTable)); 1422 return -EIO; 1423 } 1424 1425 for (i = 0; i < spm->numSparingTables; i++) { 1426 loc = le32_to_cpu(spm->locSparingTable[i]); 1427 bh = udf_read_tagged(sb, loc, loc, &ident); 1428 if (!bh) 1429 continue; 1430 1431 st = (struct sparingTable *)bh->b_data; 1432 if (ident != 0 || 1433 strncmp(st->sparingIdent.ident, UDF_ID_SPARING, 1434 strlen(UDF_ID_SPARING)) || 1435 struct_size(st, mapEntry, 1436 le16_to_cpu(st->reallocationTableLen)) > 1437 sb->s_blocksize) { 1438 brelse(bh); 1439 continue; 1440 } 1441 1442 sdata->s_spar_map[i] = bh; 1443 } 1444 map->s_partition_func = udf_get_pblock_spar15; 1445 return 0; 1446 } 1447 1448 static int udf_load_logicalvol(struct super_block *sb, sector_t block, 1449 struct kernel_lb_addr *fileset) 1450 { 1451 struct logicalVolDesc *lvd; 1452 int i, offset; 1453 uint8_t type; 1454 struct udf_sb_info *sbi = UDF_SB(sb); 1455 struct genericPartitionMap *gpm; 1456 uint16_t ident; 1457 struct buffer_head *bh; 1458 unsigned int table_len, part_map_count; 1459 int ret; 1460 1461 bh = udf_read_tagged(sb, block, block, &ident); 1462 if (!bh) 1463 return -EAGAIN; 1464 BUG_ON(ident != TAG_IDENT_LVD); 1465 lvd = (struct logicalVolDesc *)bh->b_data; 1466 table_len = le32_to_cpu(lvd->mapTableLength); 1467 if (table_len > sb->s_blocksize - sizeof(*lvd)) { 1468 udf_err(sb, "error loading logical volume descriptor: " 1469 "Partition table too long (%u > %lu)\n", table_len, 1470 sb->s_blocksize - sizeof(*lvd)); 1471 ret = -EIO; 1472 goto out_bh; 1473 } 1474 1475 ret = udf_verify_domain_identifier(sb, &lvd->domainIdent, 1476 "logical volume"); 1477 if (ret) 1478 goto out_bh; 1479 1480 part_map_count = le32_to_cpu(lvd->numPartitionMaps); 1481 if (part_map_count > table_len / sizeof(struct genericPartitionMap1)) { 1482 udf_err(sb, "error loading logical volume descriptor: " 1483 "Too many partition maps (%u > %u)\n", part_map_count, 1484 table_len / (unsigned)sizeof(struct genericPartitionMap1)); 1485 ret = -EIO; 1486 goto out_bh; 1487 } 1488 ret = udf_sb_alloc_partition_maps(sb, part_map_count); 1489 if (ret) 1490 goto out_bh; 1491 1492 for (i = 0, offset = 0; 1493 i < sbi->s_partitions && offset < table_len; 1494 i++, offset += gpm->partitionMapLength) { 1495 struct udf_part_map *map = &sbi->s_partmaps[i]; 1496 gpm = (struct genericPartitionMap *) 1497 &(lvd->partitionMaps[offset]); 1498 type = gpm->partitionMapType; 1499 if (type == 1) { 1500 struct genericPartitionMap1 *gpm1 = 1501 (struct genericPartitionMap1 *)gpm; 1502 map->s_partition_type = UDF_TYPE1_MAP15; 1503 map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum); 1504 map->s_partition_num = le16_to_cpu(gpm1->partitionNum); 1505 map->s_partition_func = NULL; 1506 } else if (type == 2) { 1507 struct udfPartitionMap2 *upm2 = 1508 (struct udfPartitionMap2 *)gpm; 1509 if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL, 1510 strlen(UDF_ID_VIRTUAL))) { 1511 u16 suf = 1512 le16_to_cpu(((__le16 *)upm2->partIdent. 1513 identSuffix)[0]); 1514 if (suf < 0x0200) { 1515 map->s_partition_type = 1516 UDF_VIRTUAL_MAP15; 1517 map->s_partition_func = 1518 udf_get_pblock_virt15; 1519 } else { 1520 map->s_partition_type = 1521 UDF_VIRTUAL_MAP20; 1522 map->s_partition_func = 1523 udf_get_pblock_virt20; 1524 } 1525 } else if (!strncmp(upm2->partIdent.ident, 1526 UDF_ID_SPARABLE, 1527 strlen(UDF_ID_SPARABLE))) { 1528 ret = udf_load_sparable_map(sb, map, 1529 (struct sparablePartitionMap *)gpm); 1530 if (ret < 0) 1531 goto out_bh; 1532 } else if (!strncmp(upm2->partIdent.ident, 1533 UDF_ID_METADATA, 1534 strlen(UDF_ID_METADATA))) { 1535 struct udf_meta_data *mdata = 1536 &map->s_type_specific.s_metadata; 1537 struct metadataPartitionMap *mdm = 1538 (struct metadataPartitionMap *) 1539 &(lvd->partitionMaps[offset]); 1540 udf_debug("Parsing Logical vol part %d type %u id=%s\n", 1541 i, type, UDF_ID_METADATA); 1542 1543 map->s_partition_type = UDF_METADATA_MAP25; 1544 map->s_partition_func = udf_get_pblock_meta25; 1545 1546 mdata->s_meta_file_loc = 1547 le32_to_cpu(mdm->metadataFileLoc); 1548 mdata->s_mirror_file_loc = 1549 le32_to_cpu(mdm->metadataMirrorFileLoc); 1550 mdata->s_bitmap_file_loc = 1551 le32_to_cpu(mdm->metadataBitmapFileLoc); 1552 mdata->s_alloc_unit_size = 1553 le32_to_cpu(mdm->allocUnitSize); 1554 mdata->s_align_unit_size = 1555 le16_to_cpu(mdm->alignUnitSize); 1556 if (mdm->flags & 0x01) 1557 mdata->s_flags |= MF_DUPLICATE_MD; 1558 1559 udf_debug("Metadata Ident suffix=0x%x\n", 1560 le16_to_cpu(*(__le16 *) 1561 mdm->partIdent.identSuffix)); 1562 udf_debug("Metadata part num=%u\n", 1563 le16_to_cpu(mdm->partitionNum)); 1564 udf_debug("Metadata part alloc unit size=%u\n", 1565 le32_to_cpu(mdm->allocUnitSize)); 1566 udf_debug("Metadata file loc=%u\n", 1567 le32_to_cpu(mdm->metadataFileLoc)); 1568 udf_debug("Mirror file loc=%u\n", 1569 le32_to_cpu(mdm->metadataMirrorFileLoc)); 1570 udf_debug("Bitmap file loc=%u\n", 1571 le32_to_cpu(mdm->metadataBitmapFileLoc)); 1572 udf_debug("Flags: %d %u\n", 1573 mdata->s_flags, mdm->flags); 1574 } else { 1575 udf_debug("Unknown ident: %s\n", 1576 upm2->partIdent.ident); 1577 continue; 1578 } 1579 map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum); 1580 map->s_partition_num = le16_to_cpu(upm2->partitionNum); 1581 } 1582 udf_debug("Partition (%d:%u) type %u on volume %u\n", 1583 i, map->s_partition_num, type, map->s_volumeseqnum); 1584 } 1585 1586 if (fileset) { 1587 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]); 1588 1589 *fileset = lelb_to_cpu(la->extLocation); 1590 udf_debug("FileSet found in LogicalVolDesc at block=%u, partition=%u\n", 1591 fileset->logicalBlockNum, 1592 fileset->partitionReferenceNum); 1593 } 1594 if (lvd->integritySeqExt.extLength) 1595 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt)); 1596 ret = 0; 1597 1598 if (!sbi->s_lvid_bh) { 1599 /* We can't generate unique IDs without a valid LVID */ 1600 if (sb_rdonly(sb)) { 1601 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT); 1602 } else { 1603 udf_warn(sb, "Damaged or missing LVID, forcing " 1604 "readonly mount\n"); 1605 ret = -EACCES; 1606 } 1607 } 1608 out_bh: 1609 brelse(bh); 1610 return ret; 1611 } 1612 1613 static bool udf_lvid_valid(struct super_block *sb, 1614 struct logicalVolIntegrityDesc *lvid) 1615 { 1616 u32 parts, impuselen; 1617 1618 parts = le32_to_cpu(lvid->numOfPartitions); 1619 impuselen = le32_to_cpu(lvid->lengthOfImpUse); 1620 if (sizeof(struct logicalVolIntegrityDescImpUse) > impuselen || 1621 impuselen >= sb->s_blocksize) 1622 return false; 1623 if (parts >= sb->s_blocksize || 1624 sizeof(struct logicalVolIntegrityDesc) + impuselen + 1625 2 * parts * sizeof(u32) > sb->s_blocksize) 1626 return false; 1627 return true; 1628 } 1629 1630 /* 1631 * Find the prevailing Logical Volume Integrity Descriptor. 1632 */ 1633 static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc) 1634 { 1635 struct buffer_head *bh, *final_bh; 1636 uint16_t ident; 1637 struct udf_sb_info *sbi = UDF_SB(sb); 1638 struct logicalVolIntegrityDesc *lvid; 1639 int indirections = 0; 1640 1641 while (++indirections <= UDF_MAX_LVID_NESTING) { 1642 final_bh = NULL; 1643 while (loc.extLength > 0 && 1644 (bh = udf_read_tagged(sb, loc.extLocation, 1645 loc.extLocation, &ident))) { 1646 if (ident != TAG_IDENT_LVID) { 1647 brelse(bh); 1648 break; 1649 } 1650 1651 brelse(final_bh); 1652 final_bh = bh; 1653 1654 loc.extLength -= sb->s_blocksize; 1655 loc.extLocation++; 1656 } 1657 1658 if (!final_bh) 1659 return; 1660 1661 lvid = (struct logicalVolIntegrityDesc *)final_bh->b_data; 1662 if (udf_lvid_valid(sb, lvid)) { 1663 brelse(sbi->s_lvid_bh); 1664 sbi->s_lvid_bh = final_bh; 1665 } else { 1666 udf_warn(sb, "Corrupted LVID (parts=%u, impuselen=%u), " 1667 "ignoring.\n", 1668 le32_to_cpu(lvid->numOfPartitions), 1669 le32_to_cpu(lvid->lengthOfImpUse)); 1670 } 1671 1672 if (lvid->nextIntegrityExt.extLength == 0) 1673 return; 1674 1675 loc = leea_to_cpu(lvid->nextIntegrityExt); 1676 } 1677 1678 udf_warn(sb, "Too many LVID indirections (max %u), ignoring.\n", 1679 UDF_MAX_LVID_NESTING); 1680 brelse(sbi->s_lvid_bh); 1681 sbi->s_lvid_bh = NULL; 1682 } 1683 1684 /* 1685 * Step for reallocation of table of partition descriptor sequence numbers. 1686 * Must be power of 2. 1687 */ 1688 #define PART_DESC_ALLOC_STEP 32 1689 1690 struct part_desc_seq_scan_data { 1691 struct udf_vds_record rec; 1692 u32 partnum; 1693 }; 1694 1695 struct desc_seq_scan_data { 1696 struct udf_vds_record vds[VDS_POS_LENGTH]; 1697 unsigned int size_part_descs; 1698 unsigned int num_part_descs; 1699 struct part_desc_seq_scan_data *part_descs_loc; 1700 }; 1701 1702 static struct udf_vds_record *handle_partition_descriptor( 1703 struct buffer_head *bh, 1704 struct desc_seq_scan_data *data) 1705 { 1706 struct partitionDesc *desc = (struct partitionDesc *)bh->b_data; 1707 int partnum; 1708 int i; 1709 1710 partnum = le16_to_cpu(desc->partitionNumber); 1711 for (i = 0; i < data->num_part_descs; i++) 1712 if (partnum == data->part_descs_loc[i].partnum) 1713 return &(data->part_descs_loc[i].rec); 1714 if (data->num_part_descs >= data->size_part_descs) { 1715 struct part_desc_seq_scan_data *new_loc; 1716 unsigned int new_size; 1717 1718 new_size = data->num_part_descs + PART_DESC_ALLOC_STEP; 1719 new_loc = kzalloc_objs(*new_loc, new_size); 1720 if (!new_loc) 1721 return ERR_PTR(-ENOMEM); 1722 memcpy(new_loc, data->part_descs_loc, 1723 data->size_part_descs * sizeof(*new_loc)); 1724 kfree(data->part_descs_loc); 1725 data->part_descs_loc = new_loc; 1726 data->size_part_descs = new_size; 1727 } 1728 data->part_descs_loc[data->num_part_descs].partnum = partnum; 1729 return &(data->part_descs_loc[data->num_part_descs++].rec); 1730 } 1731 1732 1733 static struct udf_vds_record *get_volume_descriptor_record(uint16_t ident, 1734 struct buffer_head *bh, struct desc_seq_scan_data *data) 1735 { 1736 switch (ident) { 1737 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */ 1738 return &(data->vds[VDS_POS_PRIMARY_VOL_DESC]); 1739 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */ 1740 return &(data->vds[VDS_POS_IMP_USE_VOL_DESC]); 1741 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */ 1742 return &(data->vds[VDS_POS_LOGICAL_VOL_DESC]); 1743 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */ 1744 return &(data->vds[VDS_POS_UNALLOC_SPACE_DESC]); 1745 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */ 1746 return handle_partition_descriptor(bh, data); 1747 } 1748 return NULL; 1749 } 1750 1751 /* 1752 * Process a main/reserve volume descriptor sequence. 1753 * @block First block of first extent of the sequence. 1754 * @lastblock Lastblock of first extent of the sequence. 1755 * @fileset There we store extent containing root fileset 1756 * 1757 * Returns <0 on error, 0 on success. -EAGAIN is special - try next descriptor 1758 * sequence 1759 */ 1760 static noinline int udf_process_sequence( 1761 struct super_block *sb, 1762 sector_t block, sector_t lastblock, 1763 struct kernel_lb_addr *fileset) 1764 { 1765 struct buffer_head *bh = NULL; 1766 struct udf_vds_record *curr; 1767 struct generic_desc *gd; 1768 struct volDescPtr *vdp; 1769 bool done = false; 1770 uint32_t vdsn; 1771 uint16_t ident; 1772 int ret; 1773 unsigned int indirections = 0; 1774 struct desc_seq_scan_data data; 1775 unsigned int i; 1776 1777 memset(data.vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH); 1778 data.size_part_descs = PART_DESC_ALLOC_STEP; 1779 data.num_part_descs = 0; 1780 data.part_descs_loc = kzalloc_objs(*data.part_descs_loc, 1781 data.size_part_descs); 1782 if (!data.part_descs_loc) 1783 return -ENOMEM; 1784 1785 /* 1786 * Read the main descriptor sequence and find which descriptors 1787 * are in it. 1788 */ 1789 for (; (!done && block <= lastblock); block++) { 1790 bh = udf_read_tagged(sb, block, block, &ident); 1791 if (!bh) 1792 break; 1793 1794 /* Process each descriptor (ISO 13346 3/8.3-8.4) */ 1795 gd = (struct generic_desc *)bh->b_data; 1796 vdsn = le32_to_cpu(gd->volDescSeqNum); 1797 switch (ident) { 1798 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */ 1799 if (++indirections > UDF_MAX_TD_NESTING) { 1800 udf_err(sb, "too many Volume Descriptor " 1801 "Pointers (max %u supported)\n", 1802 UDF_MAX_TD_NESTING); 1803 brelse(bh); 1804 ret = -EIO; 1805 goto out; 1806 } 1807 1808 vdp = (struct volDescPtr *)bh->b_data; 1809 block = le32_to_cpu(vdp->nextVolDescSeqExt.extLocation); 1810 lastblock = le32_to_cpu( 1811 vdp->nextVolDescSeqExt.extLength) >> 1812 sb->s_blocksize_bits; 1813 lastblock += block - 1; 1814 /* For loop is going to increment 'block' again */ 1815 block--; 1816 break; 1817 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */ 1818 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */ 1819 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */ 1820 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */ 1821 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */ 1822 curr = get_volume_descriptor_record(ident, bh, &data); 1823 if (IS_ERR(curr)) { 1824 brelse(bh); 1825 ret = PTR_ERR(curr); 1826 goto out; 1827 } 1828 /* Descriptor we don't care about? */ 1829 if (!curr) 1830 break; 1831 if (vdsn >= curr->volDescSeqNum) { 1832 curr->volDescSeqNum = vdsn; 1833 curr->block = block; 1834 } 1835 break; 1836 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */ 1837 done = true; 1838 break; 1839 } 1840 brelse(bh); 1841 } 1842 /* 1843 * Now read interesting descriptors again and process them 1844 * in a suitable order 1845 */ 1846 if (!data.vds[VDS_POS_PRIMARY_VOL_DESC].block) { 1847 udf_err(sb, "Primary Volume Descriptor not found!\n"); 1848 ret = -EAGAIN; 1849 goto out; 1850 } 1851 ret = udf_load_pvoldesc(sb, data.vds[VDS_POS_PRIMARY_VOL_DESC].block); 1852 if (ret < 0) 1853 goto out; 1854 1855 if (data.vds[VDS_POS_LOGICAL_VOL_DESC].block) { 1856 ret = udf_load_logicalvol(sb, 1857 data.vds[VDS_POS_LOGICAL_VOL_DESC].block, 1858 fileset); 1859 if (ret < 0) 1860 goto out; 1861 } 1862 1863 /* Now handle prevailing Partition Descriptors */ 1864 for (i = 0; i < data.num_part_descs; i++) { 1865 ret = udf_load_partdesc(sb, data.part_descs_loc[i].rec.block); 1866 if (ret < 0) 1867 goto out; 1868 } 1869 ret = 0; 1870 out: 1871 kfree(data.part_descs_loc); 1872 return ret; 1873 } 1874 1875 /* 1876 * Load Volume Descriptor Sequence described by anchor in bh 1877 * 1878 * Returns <0 on error, 0 on success 1879 */ 1880 static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh, 1881 struct kernel_lb_addr *fileset) 1882 { 1883 struct anchorVolDescPtr *anchor; 1884 sector_t main_s, main_e, reserve_s, reserve_e; 1885 int ret; 1886 1887 anchor = (struct anchorVolDescPtr *)bh->b_data; 1888 1889 /* Locate the main sequence */ 1890 main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation); 1891 main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength); 1892 main_e = main_e >> sb->s_blocksize_bits; 1893 main_e += main_s - 1; 1894 1895 /* Locate the reserve sequence */ 1896 reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation); 1897 reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength); 1898 reserve_e = reserve_e >> sb->s_blocksize_bits; 1899 reserve_e += reserve_s - 1; 1900 1901 /* Process the main & reserve sequences */ 1902 /* responsible for finding the PartitionDesc(s) */ 1903 ret = udf_process_sequence(sb, main_s, main_e, fileset); 1904 if (ret != -EAGAIN) 1905 return ret; 1906 udf_sb_free_partitions(sb); 1907 ret = udf_process_sequence(sb, reserve_s, reserve_e, fileset); 1908 if (ret < 0) { 1909 udf_sb_free_partitions(sb); 1910 /* No sequence was OK, return -EIO */ 1911 if (ret == -EAGAIN) 1912 ret = -EIO; 1913 } 1914 return ret; 1915 } 1916 1917 /* 1918 * Check whether there is an anchor block in the given block and 1919 * load Volume Descriptor Sequence if so. 1920 * 1921 * Returns <0 on error, 0 on success, -EAGAIN is special - try next anchor 1922 * block 1923 */ 1924 static int udf_check_anchor_block(struct super_block *sb, sector_t block, 1925 struct kernel_lb_addr *fileset) 1926 { 1927 struct buffer_head *bh; 1928 uint16_t ident; 1929 int ret; 1930 1931 bh = udf_read_tagged(sb, block, block, &ident); 1932 if (!bh) 1933 return -EAGAIN; 1934 if (ident != TAG_IDENT_AVDP) { 1935 brelse(bh); 1936 return -EAGAIN; 1937 } 1938 ret = udf_load_sequence(sb, bh, fileset); 1939 brelse(bh); 1940 return ret; 1941 } 1942 1943 /* 1944 * Search for an anchor volume descriptor pointer. 1945 * 1946 * Returns < 0 on error, 0 on success. -EAGAIN is special - try next set 1947 * of anchors. 1948 */ 1949 static int udf_scan_anchors(struct super_block *sb, udf_pblk_t *lastblock, 1950 struct kernel_lb_addr *fileset) 1951 { 1952 udf_pblk_t last[6]; 1953 int i; 1954 struct udf_sb_info *sbi = UDF_SB(sb); 1955 int last_count = 0; 1956 int ret; 1957 1958 /* First try user provided anchor */ 1959 if (sbi->s_anchor) { 1960 ret = udf_check_anchor_block(sb, sbi->s_anchor, fileset); 1961 if (ret != -EAGAIN) 1962 return ret; 1963 } 1964 /* 1965 * according to spec, anchor is in either: 1966 * block 256 1967 * lastblock-256 1968 * lastblock 1969 * however, if the disc isn't closed, it could be 512. 1970 */ 1971 ret = udf_check_anchor_block(sb, sbi->s_session + 256, fileset); 1972 if (ret != -EAGAIN) 1973 return ret; 1974 /* 1975 * The trouble is which block is the last one. Drives often misreport 1976 * this so we try various possibilities. 1977 */ 1978 last[last_count++] = *lastblock; 1979 if (*lastblock >= 1) 1980 last[last_count++] = *lastblock - 1; 1981 last[last_count++] = *lastblock + 1; 1982 if (*lastblock >= 2) 1983 last[last_count++] = *lastblock - 2; 1984 if (*lastblock >= 150) 1985 last[last_count++] = *lastblock - 150; 1986 if (*lastblock >= 152) 1987 last[last_count++] = *lastblock - 152; 1988 1989 for (i = 0; i < last_count; i++) { 1990 if (last[i] >= sb_bdev_nr_blocks(sb)) 1991 continue; 1992 ret = udf_check_anchor_block(sb, last[i], fileset); 1993 if (ret != -EAGAIN) { 1994 if (!ret) 1995 *lastblock = last[i]; 1996 return ret; 1997 } 1998 if (last[i] < 256) 1999 continue; 2000 ret = udf_check_anchor_block(sb, last[i] - 256, fileset); 2001 if (ret != -EAGAIN) { 2002 if (!ret) 2003 *lastblock = last[i]; 2004 return ret; 2005 } 2006 } 2007 2008 /* Finally try block 512 in case media is open */ 2009 return udf_check_anchor_block(sb, sbi->s_session + 512, fileset); 2010 } 2011 2012 /* 2013 * Check Volume Structure Descriptor, find Anchor block and load Volume 2014 * Descriptor Sequence. 2015 * 2016 * Returns < 0 on error, 0 on success. -EAGAIN is special meaning anchor 2017 * block was not found. 2018 */ 2019 static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt, 2020 int silent, struct kernel_lb_addr *fileset) 2021 { 2022 struct udf_sb_info *sbi = UDF_SB(sb); 2023 int nsr = 0; 2024 int ret; 2025 2026 if (!sb_set_blocksize(sb, uopt->blocksize)) { 2027 if (!silent) 2028 udf_warn(sb, "Bad block size\n"); 2029 return -EINVAL; 2030 } 2031 sbi->s_last_block = uopt->lastblock; 2032 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_NOVRS)) { 2033 /* Check that it is NSR02 compliant */ 2034 nsr = udf_check_vsd(sb); 2035 if (!nsr) { 2036 if (!silent) 2037 udf_warn(sb, "No VRS found\n"); 2038 return -EINVAL; 2039 } 2040 if (nsr == -1) 2041 udf_debug("Failed to read sector at offset %d. " 2042 "Assuming open disc. Skipping validity " 2043 "check\n", VSD_FIRST_SECTOR_OFFSET); 2044 if (!sbi->s_last_block) 2045 sbi->s_last_block = udf_get_last_block(sb); 2046 } else { 2047 udf_debug("Validity check skipped because of novrs option\n"); 2048 } 2049 2050 /* Look for anchor block and load Volume Descriptor Sequence */ 2051 sbi->s_anchor = uopt->anchor; 2052 ret = udf_scan_anchors(sb, &sbi->s_last_block, fileset); 2053 if (ret < 0) { 2054 if (!silent && ret == -EAGAIN) 2055 udf_warn(sb, "No anchor found\n"); 2056 return ret; 2057 } 2058 return 0; 2059 } 2060 2061 static void udf_mark_buffer_dirty(struct buffer_head *bh) 2062 { 2063 /* 2064 * We set buffer uptodate unconditionally here to avoid spurious 2065 * warnings from mark_buffer_dirty() when previous EIO has marked 2066 * the buffer as !uptodate 2067 */ 2068 set_buffer_uptodate(bh); 2069 mark_buffer_dirty(bh); 2070 } 2071 2072 static void udf_finalize_lvid(struct logicalVolIntegrityDesc *lvid) 2073 { 2074 struct timespec64 ts; 2075 2076 ktime_get_real_ts64(&ts); 2077 udf_time_to_disk_stamp(&lvid->recordingDateAndTime, ts); 2078 lvid->descTag.descCRC = cpu_to_le16( 2079 crc_itu_t(0, (char *)lvid + sizeof(struct tag), 2080 le16_to_cpu(lvid->descTag.descCRCLength))); 2081 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag); 2082 } 2083 2084 static void udf_open_lvid(struct super_block *sb) 2085 { 2086 struct udf_sb_info *sbi = UDF_SB(sb); 2087 struct buffer_head *bh = sbi->s_lvid_bh; 2088 struct logicalVolIntegrityDesc *lvid; 2089 struct logicalVolIntegrityDescImpUse *lvidiu; 2090 2091 if (!bh) 2092 return; 2093 lvid = (struct logicalVolIntegrityDesc *)bh->b_data; 2094 lvidiu = udf_sb_lvidiu(sb); 2095 if (!lvidiu) 2096 return; 2097 2098 mutex_lock(&sbi->s_alloc_mutex); 2099 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX; 2100 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX; 2101 if (le32_to_cpu(lvid->integrityType) == LVID_INTEGRITY_TYPE_CLOSE) 2102 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN); 2103 else 2104 UDF_SET_FLAG(sb, UDF_FLAG_INCONSISTENT); 2105 2106 udf_finalize_lvid(lvid); 2107 udf_mark_buffer_dirty(bh); 2108 sbi->s_lvid_dirty = 0; 2109 mutex_unlock(&sbi->s_alloc_mutex); 2110 /* Make opening of filesystem visible on the media immediately */ 2111 sync_dirty_buffer(bh); 2112 } 2113 2114 static void udf_close_lvid(struct super_block *sb) 2115 { 2116 struct udf_sb_info *sbi = UDF_SB(sb); 2117 struct buffer_head *bh = sbi->s_lvid_bh; 2118 struct logicalVolIntegrityDesc *lvid; 2119 struct logicalVolIntegrityDescImpUse *lvidiu; 2120 2121 if (!bh) 2122 return; 2123 lvid = (struct logicalVolIntegrityDesc *)bh->b_data; 2124 lvidiu = udf_sb_lvidiu(sb); 2125 if (!lvidiu) 2126 return; 2127 2128 mutex_lock(&sbi->s_alloc_mutex); 2129 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX; 2130 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX; 2131 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev)) 2132 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION); 2133 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev)) 2134 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev); 2135 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev)) 2136 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev); 2137 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_INCONSISTENT)) 2138 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE); 2139 2140 udf_finalize_lvid(lvid); 2141 udf_mark_buffer_dirty(bh); 2142 sbi->s_lvid_dirty = 0; 2143 mutex_unlock(&sbi->s_alloc_mutex); 2144 /* Make closing of filesystem visible on the media immediately */ 2145 sync_dirty_buffer(bh); 2146 } 2147 2148 u64 lvid_get_unique_id(struct super_block *sb) 2149 { 2150 struct buffer_head *bh; 2151 struct udf_sb_info *sbi = UDF_SB(sb); 2152 struct logicalVolIntegrityDesc *lvid; 2153 struct logicalVolHeaderDesc *lvhd; 2154 u64 uniqueID; 2155 u64 ret; 2156 2157 bh = sbi->s_lvid_bh; 2158 if (!bh) 2159 return 0; 2160 2161 lvid = (struct logicalVolIntegrityDesc *)bh->b_data; 2162 lvhd = (struct logicalVolHeaderDesc *)lvid->logicalVolContentsUse; 2163 2164 mutex_lock(&sbi->s_alloc_mutex); 2165 ret = uniqueID = le64_to_cpu(lvhd->uniqueID); 2166 if (!(++uniqueID & 0xFFFFFFFF)) 2167 uniqueID += 16; 2168 lvhd->uniqueID = cpu_to_le64(uniqueID); 2169 udf_updated_lvid(sb); 2170 mutex_unlock(&sbi->s_alloc_mutex); 2171 2172 return ret; 2173 } 2174 2175 static int udf_fill_super(struct super_block *sb, struct fs_context *fc) 2176 { 2177 int ret = -EINVAL; 2178 struct inode *inode = NULL; 2179 struct udf_options *uopt = fc->fs_private; 2180 struct kernel_lb_addr rootdir, fileset; 2181 struct udf_sb_info *sbi; 2182 bool lvid_open = false; 2183 int silent = fc->sb_flags & SB_SILENT; 2184 2185 sbi = kzalloc_obj(*sbi); 2186 if (!sbi) 2187 return -ENOMEM; 2188 2189 sb->s_fs_info = sbi; 2190 2191 mutex_init(&sbi->s_alloc_mutex); 2192 2193 fileset.logicalBlockNum = 0xFFFFFFFF; 2194 fileset.partitionReferenceNum = 0xFFFF; 2195 2196 sbi->s_flags = uopt->flags; 2197 sbi->s_uid = uopt->uid; 2198 sbi->s_gid = uopt->gid; 2199 sbi->s_umask = uopt->umask; 2200 sbi->s_fmode = uopt->fmode; 2201 sbi->s_dmode = uopt->dmode; 2202 sbi->s_nls_map = uopt->nls_map; 2203 uopt->nls_map = NULL; 2204 rwlock_init(&sbi->s_cred_lock); 2205 2206 if (uopt->session == 0xFFFFFFFF) 2207 sbi->s_session = udf_get_last_session(sb); 2208 else 2209 sbi->s_session = uopt->session; 2210 2211 udf_debug("Multi-session=%d\n", sbi->s_session); 2212 2213 /* Fill in the rest of the superblock */ 2214 sb->s_op = &udf_sb_ops; 2215 sb->s_export_op = &udf_export_ops; 2216 2217 sb->s_magic = UDF_SUPER_MAGIC; 2218 sb->s_time_gran = 1000; 2219 2220 if (uopt->flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) { 2221 ret = udf_load_vrs(sb, uopt, silent, &fileset); 2222 } else { 2223 uopt->blocksize = bdev_logical_block_size(sb->s_bdev); 2224 while (uopt->blocksize <= 4096) { 2225 ret = udf_load_vrs(sb, uopt, silent, &fileset); 2226 if (ret < 0) { 2227 if (!silent && ret != -EACCES) { 2228 pr_notice("Scanning with blocksize %u failed\n", 2229 uopt->blocksize); 2230 } 2231 brelse(sbi->s_lvid_bh); 2232 sbi->s_lvid_bh = NULL; 2233 /* 2234 * EACCES is special - we want to propagate to 2235 * upper layers that we cannot handle RW mount. 2236 */ 2237 if (ret == -EACCES) 2238 break; 2239 } else 2240 break; 2241 2242 uopt->blocksize <<= 1; 2243 } 2244 } 2245 if (ret < 0) { 2246 if (ret == -EAGAIN) { 2247 udf_warn(sb, "No partition found (1)\n"); 2248 ret = -EINVAL; 2249 } 2250 goto error_out; 2251 } 2252 2253 udf_debug("Lastblock=%u\n", sbi->s_last_block); 2254 2255 if (sbi->s_lvid_bh) { 2256 struct logicalVolIntegrityDescImpUse *lvidiu = 2257 udf_sb_lvidiu(sb); 2258 uint16_t minUDFReadRev; 2259 uint16_t minUDFWriteRev; 2260 2261 if (!lvidiu) { 2262 ret = -EINVAL; 2263 goto error_out; 2264 } 2265 minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev); 2266 minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev); 2267 if (minUDFReadRev > UDF_MAX_READ_VERSION) { 2268 udf_err(sb, "minUDFReadRev=%x (max is %x)\n", 2269 minUDFReadRev, 2270 UDF_MAX_READ_VERSION); 2271 ret = -EINVAL; 2272 goto error_out; 2273 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION) { 2274 if (!sb_rdonly(sb)) { 2275 ret = -EACCES; 2276 goto error_out; 2277 } 2278 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT); 2279 } 2280 2281 sbi->s_udfrev = minUDFWriteRev; 2282 2283 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE) 2284 UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE); 2285 if (minUDFReadRev >= UDF_VERS_USE_STREAMS) 2286 UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS); 2287 } 2288 2289 if (!sbi->s_partitions) { 2290 udf_warn(sb, "No partition found (2)\n"); 2291 ret = -EINVAL; 2292 goto error_out; 2293 } 2294 2295 if (sbi->s_partmaps[sbi->s_partition].s_partition_flags & 2296 UDF_PART_FLAG_READ_ONLY) { 2297 if (!sb_rdonly(sb)) { 2298 ret = -EACCES; 2299 goto error_out; 2300 } 2301 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT); 2302 } 2303 2304 ret = udf_find_fileset(sb, &fileset, &rootdir); 2305 if (ret < 0) { 2306 udf_warn(sb, "No fileset found\n"); 2307 goto error_out; 2308 } 2309 2310 if (!silent) { 2311 struct timestamp ts; 2312 udf_time_to_disk_stamp(&ts, sbi->s_record_time); 2313 udf_info("Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n", 2314 sbi->s_volume_ident, 2315 le16_to_cpu(ts.year), ts.month, ts.day, 2316 ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone)); 2317 } 2318 if (!sb_rdonly(sb)) { 2319 udf_open_lvid(sb); 2320 lvid_open = true; 2321 } 2322 2323 /* Assign the root inode */ 2324 /* assign inodes by physical block number */ 2325 /* perhaps it's not extensible enough, but for now ... */ 2326 inode = udf_iget(sb, &rootdir); 2327 if (IS_ERR(inode)) { 2328 udf_err(sb, "Error in udf_iget, block=%u, partition=%u\n", 2329 rootdir.logicalBlockNum, rootdir.partitionReferenceNum); 2330 ret = PTR_ERR(inode); 2331 goto error_out; 2332 } 2333 2334 /* Allocate a dentry for the root inode */ 2335 sb->s_root = d_make_root(inode); 2336 if (!sb->s_root) { 2337 udf_err(sb, "Couldn't allocate root dentry\n"); 2338 ret = -ENOMEM; 2339 goto error_out; 2340 } 2341 sb->s_maxbytes = UDF_MAX_FILESIZE; 2342 sb->s_max_links = UDF_MAX_LINKS; 2343 return 0; 2344 2345 error_out: 2346 iput(sbi->s_vat_inode); 2347 unload_nls(sbi->s_nls_map); 2348 if (lvid_open) 2349 udf_close_lvid(sb); 2350 brelse(sbi->s_lvid_bh); 2351 udf_sb_free_partitions(sb); 2352 kfree(sbi); 2353 sb->s_fs_info = NULL; 2354 2355 return ret; 2356 } 2357 2358 void _udf_err(struct super_block *sb, const char *function, 2359 const char *fmt, ...) 2360 { 2361 struct va_format vaf; 2362 va_list args; 2363 2364 va_start(args, fmt); 2365 2366 vaf.fmt = fmt; 2367 vaf.va = &args; 2368 2369 pr_err("error (device %s): %s: %pV", sb->s_id, function, &vaf); 2370 2371 va_end(args); 2372 } 2373 2374 void _udf_warn(struct super_block *sb, const char *function, 2375 const char *fmt, ...) 2376 { 2377 struct va_format vaf; 2378 va_list args; 2379 2380 va_start(args, fmt); 2381 2382 vaf.fmt = fmt; 2383 vaf.va = &args; 2384 2385 pr_warn("warning (device %s): %s: %pV", sb->s_id, function, &vaf); 2386 2387 va_end(args); 2388 } 2389 2390 static void udf_put_super(struct super_block *sb) 2391 { 2392 struct udf_sb_info *sbi; 2393 2394 sbi = UDF_SB(sb); 2395 2396 iput(sbi->s_vat_inode); 2397 unload_nls(sbi->s_nls_map); 2398 if (!sb_rdonly(sb)) 2399 udf_close_lvid(sb); 2400 brelse(sbi->s_lvid_bh); 2401 udf_sb_free_partitions(sb); 2402 mutex_destroy(&sbi->s_alloc_mutex); 2403 kfree(sb->s_fs_info); 2404 sb->s_fs_info = NULL; 2405 } 2406 2407 static int udf_sync_fs(struct super_block *sb, int wait) 2408 { 2409 struct udf_sb_info *sbi = UDF_SB(sb); 2410 2411 mutex_lock(&sbi->s_alloc_mutex); 2412 if (sbi->s_lvid_dirty) { 2413 struct buffer_head *bh = sbi->s_lvid_bh; 2414 struct logicalVolIntegrityDesc *lvid; 2415 2416 lvid = (struct logicalVolIntegrityDesc *)bh->b_data; 2417 udf_finalize_lvid(lvid); 2418 2419 /* 2420 * Blockdevice will be synced later so we don't have to submit 2421 * the buffer for IO 2422 */ 2423 udf_mark_buffer_dirty(bh); 2424 sbi->s_lvid_dirty = 0; 2425 } 2426 mutex_unlock(&sbi->s_alloc_mutex); 2427 2428 return 0; 2429 } 2430 2431 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf) 2432 { 2433 struct super_block *sb = dentry->d_sb; 2434 struct udf_sb_info *sbi = UDF_SB(sb); 2435 struct logicalVolIntegrityDescImpUse *lvidiu; 2436 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 2437 2438 lvidiu = udf_sb_lvidiu(sb); 2439 buf->f_type = UDF_SUPER_MAGIC; 2440 buf->f_bsize = sb->s_blocksize; 2441 buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len; 2442 buf->f_bfree = udf_count_free(sb); 2443 buf->f_bavail = buf->f_bfree; 2444 /* 2445 * Let's pretend each free block is also a free 'inode' since UDF does 2446 * not have separate preallocated table of inodes. 2447 */ 2448 buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) + 2449 le32_to_cpu(lvidiu->numDirs)) : 0) 2450 + buf->f_bfree; 2451 buf->f_ffree = buf->f_bfree; 2452 buf->f_namelen = UDF_NAME_LEN; 2453 buf->f_fsid = u64_to_fsid(id); 2454 2455 return 0; 2456 } 2457 2458 static unsigned int udf_count_free_bitmap(struct super_block *sb, 2459 struct udf_bitmap *bitmap) 2460 { 2461 struct buffer_head *bh = NULL; 2462 unsigned int accum = 0; 2463 int index; 2464 udf_pblk_t block = 0, newblock; 2465 struct kernel_lb_addr loc; 2466 uint32_t bytes; 2467 uint8_t *ptr; 2468 uint16_t ident; 2469 struct spaceBitmapDesc *bm; 2470 2471 loc.logicalBlockNum = bitmap->s_extPosition; 2472 loc.partitionReferenceNum = UDF_SB(sb)->s_partition; 2473 bh = udf_read_ptagged(sb, &loc, 0, &ident); 2474 2475 if (!bh) { 2476 udf_err(sb, "udf_count_free failed\n"); 2477 goto out; 2478 } else if (ident != TAG_IDENT_SBD) { 2479 brelse(bh); 2480 udf_err(sb, "udf_count_free failed\n"); 2481 goto out; 2482 } 2483 2484 bm = (struct spaceBitmapDesc *)bh->b_data; 2485 bytes = le32_to_cpu(bm->numOfBytes); 2486 index = sizeof(struct spaceBitmapDesc); /* offset in first block only */ 2487 ptr = (uint8_t *)bh->b_data; 2488 2489 while (bytes > 0) { 2490 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index); 2491 accum += bitmap_weight((const unsigned long *)(ptr + index), 2492 cur_bytes * 8); 2493 bytes -= cur_bytes; 2494 if (bytes) { 2495 brelse(bh); 2496 newblock = udf_get_lb_pblock(sb, &loc, ++block); 2497 bh = sb_bread(sb, newblock); 2498 if (!bh) { 2499 udf_debug("read failed\n"); 2500 goto out; 2501 } 2502 index = 0; 2503 ptr = (uint8_t *)bh->b_data; 2504 } 2505 } 2506 brelse(bh); 2507 out: 2508 return accum; 2509 } 2510 2511 static unsigned int udf_count_free_table(struct super_block *sb, 2512 struct inode *table) 2513 { 2514 unsigned int accum = 0; 2515 uint32_t elen; 2516 struct kernel_lb_addr eloc; 2517 struct extent_position epos; 2518 int8_t etype; 2519 2520 mutex_lock(&UDF_SB(sb)->s_alloc_mutex); 2521 epos.block = UDF_I(table)->i_location; 2522 epos.offset = sizeof(struct unallocSpaceEntry); 2523 epos.bh = NULL; 2524 2525 while (udf_next_aext(table, &epos, &eloc, &elen, &etype, 1) > 0) 2526 accum += (elen >> table->i_sb->s_blocksize_bits); 2527 2528 brelse(epos.bh); 2529 mutex_unlock(&UDF_SB(sb)->s_alloc_mutex); 2530 2531 return accum; 2532 } 2533 2534 static unsigned int udf_count_free(struct super_block *sb) 2535 { 2536 unsigned int accum = 0; 2537 struct udf_sb_info *sbi = UDF_SB(sb); 2538 struct udf_part_map *map; 2539 unsigned int part = sbi->s_partition; 2540 int ptype = sbi->s_partmaps[part].s_partition_type; 2541 2542 if (ptype == UDF_METADATA_MAP25) { 2543 part = sbi->s_partmaps[part].s_type_specific.s_metadata. 2544 s_phys_partition_ref; 2545 } else if (ptype == UDF_VIRTUAL_MAP15 || ptype == UDF_VIRTUAL_MAP20) { 2546 /* 2547 * Filesystems with VAT are append-only and we cannot write to 2548 * them. Let's just report 0 here. 2549 */ 2550 return 0; 2551 } 2552 2553 if (sbi->s_lvid_bh) { 2554 struct logicalVolIntegrityDesc *lvid = 2555 (struct logicalVolIntegrityDesc *) 2556 sbi->s_lvid_bh->b_data; 2557 if (le32_to_cpu(lvid->numOfPartitions) > part) { 2558 accum = le32_to_cpu( 2559 lvid->freeSpaceTable[part]); 2560 if (accum == 0xFFFFFFFF) 2561 accum = 0; 2562 } 2563 } 2564 2565 if (accum) 2566 return accum; 2567 2568 map = &sbi->s_partmaps[part]; 2569 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) { 2570 accum += udf_count_free_bitmap(sb, 2571 map->s_uspace.s_bitmap); 2572 } 2573 if (accum) 2574 return accum; 2575 2576 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) { 2577 accum += udf_count_free_table(sb, 2578 map->s_uspace.s_table); 2579 } 2580 return accum; 2581 } 2582 2583 MODULE_AUTHOR("Ben Fennema"); 2584 MODULE_DESCRIPTION("Universal Disk Format Filesystem"); 2585 MODULE_LICENSE("GPL"); 2586 module_init(init_udf_fs) 2587 module_exit(exit_udf_fs) 2588