1 /* 2 * super.c 3 * 4 * PURPOSE 5 * Super block routines for the OSTA-UDF(tm) filesystem. 6 * 7 * DESCRIPTION 8 * OSTA-UDF(tm) = Optical Storage Technology Association 9 * Universal Disk Format. 10 * 11 * This code is based on version 2.00 of the UDF specification, 12 * and revision 3 of the ECMA 167 standard [equivalent to ISO 13346]. 13 * http://www.osta.org/ 14 * http://www.ecma.ch/ 15 * http://www.iso.org/ 16 * 17 * COPYRIGHT 18 * This file is distributed under the terms of the GNU General Public 19 * License (GPL). Copies of the GPL can be obtained from: 20 * ftp://prep.ai.mit.edu/pub/gnu/GPL 21 * Each contributing author retains all rights to their own work. 22 * 23 * (C) 1998 Dave Boynton 24 * (C) 1998-2004 Ben Fennema 25 * (C) 2000 Stelias Computing Inc 26 * 27 * HISTORY 28 * 29 * 09/24/98 dgb changed to allow compiling outside of kernel, and 30 * added some debugging. 31 * 10/01/98 dgb updated to allow (some) possibility of compiling w/2.0.34 32 * 10/16/98 attempting some multi-session support 33 * 10/17/98 added freespace count for "df" 34 * 11/11/98 gr added novrs option 35 * 11/26/98 dgb added fileset,anchor mount options 36 * 12/06/98 blf really hosed things royally. vat/sparing support. sequenced vol descs 37 * rewrote option handling based on isofs 38 * 12/20/98 find the free space bitmap (if it exists) 39 */ 40 41 #include "udfdecl.h" 42 43 #include <linux/blkdev.h> 44 #include <linux/slab.h> 45 #include <linux/kernel.h> 46 #include <linux/module.h> 47 #include <linux/parser.h> 48 #include <linux/stat.h> 49 #include <linux/cdrom.h> 50 #include <linux/nls.h> 51 #include <linux/smp_lock.h> 52 #include <linux/buffer_head.h> 53 #include <linux/vfs.h> 54 #include <linux/vmalloc.h> 55 #include <asm/byteorder.h> 56 57 #include <linux/udf_fs.h> 58 #include "udf_sb.h" 59 #include "udf_i.h" 60 61 #include <linux/init.h> 62 #include <asm/uaccess.h> 63 64 #define VDS_POS_PRIMARY_VOL_DESC 0 65 #define VDS_POS_UNALLOC_SPACE_DESC 1 66 #define VDS_POS_LOGICAL_VOL_DESC 2 67 #define VDS_POS_PARTITION_DESC 3 68 #define VDS_POS_IMP_USE_VOL_DESC 4 69 #define VDS_POS_VOL_DESC_PTR 5 70 #define VDS_POS_TERMINATING_DESC 6 71 #define VDS_POS_LENGTH 7 72 73 static char error_buf[1024]; 74 75 /* These are the "meat" - everything else is stuffing */ 76 static int udf_fill_super(struct super_block *, void *, int); 77 static void udf_put_super(struct super_block *); 78 static void udf_write_super(struct super_block *); 79 static int udf_remount_fs(struct super_block *, int *, char *); 80 static int udf_check_valid(struct super_block *, int, int); 81 static int udf_vrs(struct super_block *sb, int silent); 82 static int udf_load_partition(struct super_block *, kernel_lb_addr *); 83 static int udf_load_logicalvol(struct super_block *, struct buffer_head *, 84 kernel_lb_addr *); 85 static void udf_load_logicalvolint(struct super_block *, kernel_extent_ad); 86 static void udf_find_anchor(struct super_block *); 87 static int udf_find_fileset(struct super_block *, kernel_lb_addr *, 88 kernel_lb_addr *); 89 static void udf_load_pvoldesc(struct super_block *, struct buffer_head *); 90 static void udf_load_fileset(struct super_block *, struct buffer_head *, 91 kernel_lb_addr *); 92 static int udf_load_partdesc(struct super_block *, struct buffer_head *); 93 static void udf_open_lvid(struct super_block *); 94 static void udf_close_lvid(struct super_block *); 95 static unsigned int udf_count_free(struct super_block *); 96 static int udf_statfs(struct dentry *, struct kstatfs *); 97 98 /* UDF filesystem type */ 99 static int udf_get_sb(struct file_system_type *fs_type, 100 int flags, const char *dev_name, void *data, 101 struct vfsmount *mnt) 102 { 103 return get_sb_bdev(fs_type, flags, dev_name, data, udf_fill_super, mnt); 104 } 105 106 static struct file_system_type udf_fstype = { 107 .owner = THIS_MODULE, 108 .name = "udf", 109 .get_sb = udf_get_sb, 110 .kill_sb = kill_block_super, 111 .fs_flags = FS_REQUIRES_DEV, 112 }; 113 114 static struct kmem_cache *udf_inode_cachep; 115 116 static struct inode *udf_alloc_inode(struct super_block *sb) 117 { 118 struct udf_inode_info *ei; 119 ei = (struct udf_inode_info *)kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL); 120 if (!ei) 121 return NULL; 122 123 ei->i_unique = 0; 124 ei->i_lenExtents = 0; 125 ei->i_next_alloc_block = 0; 126 ei->i_next_alloc_goal = 0; 127 ei->i_strat4096 = 0; 128 129 return &ei->vfs_inode; 130 } 131 132 static void udf_destroy_inode(struct inode *inode) 133 { 134 kmem_cache_free(udf_inode_cachep, UDF_I(inode)); 135 } 136 137 static void init_once(struct kmem_cache *cachep, void *foo) 138 { 139 struct udf_inode_info *ei = (struct udf_inode_info *)foo; 140 141 ei->i_ext.i_data = NULL; 142 inode_init_once(&ei->vfs_inode); 143 } 144 145 static int init_inodecache(void) 146 { 147 udf_inode_cachep = kmem_cache_create("udf_inode_cache", 148 sizeof(struct udf_inode_info), 149 0, (SLAB_RECLAIM_ACCOUNT | 150 SLAB_MEM_SPREAD), 151 init_once); 152 if (!udf_inode_cachep) 153 return -ENOMEM; 154 return 0; 155 } 156 157 static void destroy_inodecache(void) 158 { 159 kmem_cache_destroy(udf_inode_cachep); 160 } 161 162 /* Superblock operations */ 163 static const struct super_operations udf_sb_ops = { 164 .alloc_inode = udf_alloc_inode, 165 .destroy_inode = udf_destroy_inode, 166 .write_inode = udf_write_inode, 167 .delete_inode = udf_delete_inode, 168 .clear_inode = udf_clear_inode, 169 .put_super = udf_put_super, 170 .write_super = udf_write_super, 171 .statfs = udf_statfs, 172 .remount_fs = udf_remount_fs, 173 }; 174 175 struct udf_options { 176 unsigned char novrs; 177 unsigned int blocksize; 178 unsigned int session; 179 unsigned int lastblock; 180 unsigned int anchor; 181 unsigned int volume; 182 unsigned short partition; 183 unsigned int fileset; 184 unsigned int rootdir; 185 unsigned int flags; 186 mode_t umask; 187 gid_t gid; 188 uid_t uid; 189 struct nls_table *nls_map; 190 }; 191 192 static int __init init_udf_fs(void) 193 { 194 int err; 195 196 err = init_inodecache(); 197 if (err) 198 goto out1; 199 err = register_filesystem(&udf_fstype); 200 if (err) 201 goto out; 202 203 return 0; 204 205 out: 206 destroy_inodecache(); 207 208 out1: 209 return err; 210 } 211 212 static void __exit exit_udf_fs(void) 213 { 214 unregister_filesystem(&udf_fstype); 215 destroy_inodecache(); 216 } 217 218 module_init(init_udf_fs) 219 module_exit(exit_udf_fs) 220 221 /* 222 * udf_parse_options 223 * 224 * PURPOSE 225 * Parse mount options. 226 * 227 * DESCRIPTION 228 * The following mount options are supported: 229 * 230 * gid= Set the default group. 231 * umask= Set the default umask. 232 * uid= Set the default user. 233 * bs= Set the block size. 234 * unhide Show otherwise hidden files. 235 * undelete Show deleted files in lists. 236 * adinicb Embed data in the inode (default) 237 * noadinicb Don't embed data in the inode 238 * shortad Use short ad's 239 * longad Use long ad's (default) 240 * nostrict Unset strict conformance 241 * iocharset= Set the NLS character set 242 * 243 * The remaining are for debugging and disaster recovery: 244 * 245 * novrs Skip volume sequence recognition 246 * 247 * The following expect a offset from 0. 248 * 249 * session= Set the CDROM session (default= last session) 250 * anchor= Override standard anchor location. (default= 256) 251 * volume= Override the VolumeDesc location. (unused) 252 * partition= Override the PartitionDesc location. (unused) 253 * lastblock= Set the last block of the filesystem/ 254 * 255 * The following expect a offset from the partition root. 256 * 257 * fileset= Override the fileset block location. (unused) 258 * rootdir= Override the root directory location. (unused) 259 * WARNING: overriding the rootdir to a non-directory may 260 * yield highly unpredictable results. 261 * 262 * PRE-CONDITIONS 263 * options Pointer to mount options string. 264 * uopts Pointer to mount options variable. 265 * 266 * POST-CONDITIONS 267 * <return> 1 Mount options parsed okay. 268 * <return> 0 Error parsing mount options. 269 * 270 * HISTORY 271 * July 1, 1997 - Andrew E. Mileski 272 * Written, tested, and released. 273 */ 274 275 enum { 276 Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete, 277 Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad, 278 Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock, 279 Opt_anchor, Opt_volume, Opt_partition, Opt_fileset, 280 Opt_rootdir, Opt_utf8, Opt_iocharset, 281 Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore 282 }; 283 284 static match_table_t tokens = { 285 {Opt_novrs, "novrs"}, 286 {Opt_nostrict, "nostrict"}, 287 {Opt_bs, "bs=%u"}, 288 {Opt_unhide, "unhide"}, 289 {Opt_undelete, "undelete"}, 290 {Opt_noadinicb, "noadinicb"}, 291 {Opt_adinicb, "adinicb"}, 292 {Opt_shortad, "shortad"}, 293 {Opt_longad, "longad"}, 294 {Opt_uforget, "uid=forget"}, 295 {Opt_uignore, "uid=ignore"}, 296 {Opt_gforget, "gid=forget"}, 297 {Opt_gignore, "gid=ignore"}, 298 {Opt_gid, "gid=%u"}, 299 {Opt_uid, "uid=%u"}, 300 {Opt_umask, "umask=%o"}, 301 {Opt_session, "session=%u"}, 302 {Opt_lastblock, "lastblock=%u"}, 303 {Opt_anchor, "anchor=%u"}, 304 {Opt_volume, "volume=%u"}, 305 {Opt_partition, "partition=%u"}, 306 {Opt_fileset, "fileset=%u"}, 307 {Opt_rootdir, "rootdir=%u"}, 308 {Opt_utf8, "utf8"}, 309 {Opt_iocharset, "iocharset=%s"}, 310 {Opt_err, NULL} 311 }; 312 313 static int udf_parse_options(char *options, struct udf_options *uopt) 314 { 315 char *p; 316 int option; 317 318 uopt->novrs = 0; 319 uopt->blocksize = 2048; 320 uopt->partition = 0xFFFF; 321 uopt->session = 0xFFFFFFFF; 322 uopt->lastblock = 0; 323 uopt->anchor = 0; 324 uopt->volume = 0xFFFFFFFF; 325 uopt->rootdir = 0xFFFFFFFF; 326 uopt->fileset = 0xFFFFFFFF; 327 uopt->nls_map = NULL; 328 329 if (!options) 330 return 1; 331 332 while ((p = strsep(&options, ",")) != NULL) { 333 substring_t args[MAX_OPT_ARGS]; 334 int token; 335 if (!*p) 336 continue; 337 338 token = match_token(p, tokens, args); 339 switch (token) { 340 case Opt_novrs: 341 uopt->novrs = 1; 342 case Opt_bs: 343 if (match_int(&args[0], &option)) 344 return 0; 345 uopt->blocksize = option; 346 break; 347 case Opt_unhide: 348 uopt->flags |= (1 << UDF_FLAG_UNHIDE); 349 break; 350 case Opt_undelete: 351 uopt->flags |= (1 << UDF_FLAG_UNDELETE); 352 break; 353 case Opt_noadinicb: 354 uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB); 355 break; 356 case Opt_adinicb: 357 uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB); 358 break; 359 case Opt_shortad: 360 uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD); 361 break; 362 case Opt_longad: 363 uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD); 364 break; 365 case Opt_gid: 366 if (match_int(args, &option)) 367 return 0; 368 uopt->gid = option; 369 uopt->flags |= (1 << UDF_FLAG_GID_SET); 370 break; 371 case Opt_uid: 372 if (match_int(args, &option)) 373 return 0; 374 uopt->uid = option; 375 uopt->flags |= (1 << UDF_FLAG_UID_SET); 376 break; 377 case Opt_umask: 378 if (match_octal(args, &option)) 379 return 0; 380 uopt->umask = option; 381 break; 382 case Opt_nostrict: 383 uopt->flags &= ~(1 << UDF_FLAG_STRICT); 384 break; 385 case Opt_session: 386 if (match_int(args, &option)) 387 return 0; 388 uopt->session = option; 389 break; 390 case Opt_lastblock: 391 if (match_int(args, &option)) 392 return 0; 393 uopt->lastblock = option; 394 break; 395 case Opt_anchor: 396 if (match_int(args, &option)) 397 return 0; 398 uopt->anchor = option; 399 break; 400 case Opt_volume: 401 if (match_int(args, &option)) 402 return 0; 403 uopt->volume = option; 404 break; 405 case Opt_partition: 406 if (match_int(args, &option)) 407 return 0; 408 uopt->partition = option; 409 break; 410 case Opt_fileset: 411 if (match_int(args, &option)) 412 return 0; 413 uopt->fileset = option; 414 break; 415 case Opt_rootdir: 416 if (match_int(args, &option)) 417 return 0; 418 uopt->rootdir = option; 419 break; 420 case Opt_utf8: 421 uopt->flags |= (1 << UDF_FLAG_UTF8); 422 break; 423 #ifdef CONFIG_UDF_NLS 424 case Opt_iocharset: 425 uopt->nls_map = load_nls(args[0].from); 426 uopt->flags |= (1 << UDF_FLAG_NLS_MAP); 427 break; 428 #endif 429 case Opt_uignore: 430 uopt->flags |= (1 << UDF_FLAG_UID_IGNORE); 431 break; 432 case Opt_uforget: 433 uopt->flags |= (1 << UDF_FLAG_UID_FORGET); 434 break; 435 case Opt_gignore: 436 uopt->flags |= (1 << UDF_FLAG_GID_IGNORE); 437 break; 438 case Opt_gforget: 439 uopt->flags |= (1 << UDF_FLAG_GID_FORGET); 440 break; 441 default: 442 printk(KERN_ERR "udf: bad mount option \"%s\" " 443 "or missing value\n", p); 444 return 0; 445 } 446 } 447 return 1; 448 } 449 450 void udf_write_super(struct super_block *sb) 451 { 452 lock_kernel(); 453 454 if (!(sb->s_flags & MS_RDONLY)) 455 udf_open_lvid(sb); 456 sb->s_dirt = 0; 457 458 unlock_kernel(); 459 } 460 461 static int udf_remount_fs(struct super_block *sb, int *flags, char *options) 462 { 463 struct udf_options uopt; 464 465 uopt.flags = UDF_SB(sb)->s_flags; 466 uopt.uid = UDF_SB(sb)->s_uid; 467 uopt.gid = UDF_SB(sb)->s_gid; 468 uopt.umask = UDF_SB(sb)->s_umask; 469 470 if (!udf_parse_options(options, &uopt)) 471 return -EINVAL; 472 473 UDF_SB(sb)->s_flags = uopt.flags; 474 UDF_SB(sb)->s_uid = uopt.uid; 475 UDF_SB(sb)->s_gid = uopt.gid; 476 UDF_SB(sb)->s_umask = uopt.umask; 477 478 if (UDF_SB_LVIDBH(sb)) { 479 int write_rev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev); 480 if (write_rev > UDF_MAX_WRITE_VERSION) 481 *flags |= MS_RDONLY; 482 } 483 484 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) 485 return 0; 486 if (*flags & MS_RDONLY) 487 udf_close_lvid(sb); 488 else 489 udf_open_lvid(sb); 490 491 return 0; 492 } 493 494 /* 495 * udf_set_blocksize 496 * 497 * PURPOSE 498 * Set the block size to be used in all transfers. 499 * 500 * DESCRIPTION 501 * To allow room for a DMA transfer, it is best to guess big when unsure. 502 * This routine picks 2048 bytes as the blocksize when guessing. This 503 * should be adequate until devices with larger block sizes become common. 504 * 505 * Note that the Linux kernel can currently only deal with blocksizes of 506 * 512, 1024, 2048, 4096, and 8192 bytes. 507 * 508 * PRE-CONDITIONS 509 * sb Pointer to _locked_ superblock. 510 * 511 * POST-CONDITIONS 512 * sb->s_blocksize Blocksize. 513 * sb->s_blocksize_bits log2 of blocksize. 514 * <return> 0 Blocksize is valid. 515 * <return> 1 Blocksize is invalid. 516 * 517 * HISTORY 518 * July 1, 1997 - Andrew E. Mileski 519 * Written, tested, and released. 520 */ 521 static int udf_set_blocksize(struct super_block *sb, int bsize) 522 { 523 if (!sb_min_blocksize(sb, bsize)) { 524 udf_debug("Bad block size (%d)\n", bsize); 525 printk(KERN_ERR "udf: bad block size (%d)\n", bsize); 526 return 0; 527 } 528 529 return sb->s_blocksize; 530 } 531 532 static int udf_vrs(struct super_block *sb, int silent) 533 { 534 struct volStructDesc *vsd = NULL; 535 int sector = 32768; 536 int sectorsize; 537 struct buffer_head *bh = NULL; 538 int iso9660 = 0; 539 int nsr02 = 0; 540 int nsr03 = 0; 541 542 /* Block size must be a multiple of 512 */ 543 if (sb->s_blocksize & 511) 544 return 0; 545 546 if (sb->s_blocksize < sizeof(struct volStructDesc)) 547 sectorsize = sizeof(struct volStructDesc); 548 else 549 sectorsize = sb->s_blocksize; 550 551 sector += (UDF_SB_SESSION(sb) << sb->s_blocksize_bits); 552 553 udf_debug("Starting at sector %u (%ld byte sectors)\n", 554 (sector >> sb->s_blocksize_bits), sb->s_blocksize); 555 /* Process the sequence (if applicable) */ 556 for (; !nsr02 && !nsr03; sector += sectorsize) { 557 /* Read a block */ 558 bh = udf_tread(sb, sector >> sb->s_blocksize_bits); 559 if (!bh) 560 break; 561 562 /* Look for ISO descriptors */ 563 vsd = (struct volStructDesc *)(bh->b_data + 564 (sector & (sb->s_blocksize - 1))); 565 566 if (vsd->stdIdent[0] == 0) { 567 brelse(bh); 568 break; 569 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001, VSD_STD_ID_LEN)) { 570 iso9660 = sector; 571 switch (vsd->structType) { 572 case 0: 573 udf_debug("ISO9660 Boot Record found\n"); 574 break; 575 case 1: 576 udf_debug 577 ("ISO9660 Primary Volume Descriptor found\n"); 578 break; 579 case 2: 580 udf_debug 581 ("ISO9660 Supplementary Volume Descriptor found\n"); 582 break; 583 case 3: 584 udf_debug 585 ("ISO9660 Volume Partition Descriptor found\n"); 586 break; 587 case 255: 588 udf_debug 589 ("ISO9660 Volume Descriptor Set Terminator found\n"); 590 break; 591 default: 592 udf_debug("ISO9660 VRS (%u) found\n", 593 vsd->structType); 594 break; 595 } 596 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01, VSD_STD_ID_LEN)) { 597 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01, VSD_STD_ID_LEN)) { 598 brelse(bh); 599 break; 600 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02, VSD_STD_ID_LEN)) { 601 nsr02 = sector; 602 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03, VSD_STD_ID_LEN)) { 603 nsr03 = sector; 604 } 605 brelse(bh); 606 } 607 608 if (nsr03) 609 return nsr03; 610 else if (nsr02) 611 return nsr02; 612 else if (sector - (UDF_SB_SESSION(sb) << sb->s_blocksize_bits) == 32768) 613 return -1; 614 else 615 return 0; 616 } 617 618 /* 619 * udf_find_anchor 620 * 621 * PURPOSE 622 * Find an anchor volume descriptor. 623 * 624 * PRE-CONDITIONS 625 * sb Pointer to _locked_ superblock. 626 * lastblock Last block on media. 627 * 628 * POST-CONDITIONS 629 * <return> 1 if not found, 0 if ok 630 * 631 * HISTORY 632 * July 1, 1997 - Andrew E. Mileski 633 * Written, tested, and released. 634 */ 635 static void udf_find_anchor(struct super_block *sb) 636 { 637 int lastblock = UDF_SB_LASTBLOCK(sb); 638 struct buffer_head *bh = NULL; 639 uint16_t ident; 640 uint32_t location; 641 int i; 642 643 if (lastblock) { 644 int varlastblock = udf_variable_to_fixed(lastblock); 645 int last[] = { lastblock, lastblock - 2, 646 lastblock - 150, lastblock - 152, 647 varlastblock, varlastblock - 2, 648 varlastblock - 150, varlastblock - 152 }; 649 650 lastblock = 0; 651 652 /* Search for an anchor volume descriptor pointer */ 653 654 /* according to spec, anchor is in either: 655 * block 256 656 * lastblock-256 657 * lastblock 658 * however, if the disc isn't closed, it could be 512 */ 659 660 for (i = 0; !lastblock && i < ARRAY_SIZE(last); i++) { 661 if (last[i] < 0 || !(bh = sb_bread(sb, last[i]))) { 662 ident = location = 0; 663 } else { 664 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent); 665 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation); 666 brelse(bh); 667 } 668 669 if (ident == TAG_IDENT_AVDP) { 670 if (location == last[i] - UDF_SB_SESSION(sb)) { 671 lastblock = UDF_SB_ANCHOR(sb)[0] = last[i] - UDF_SB_SESSION(sb); 672 UDF_SB_ANCHOR(sb)[1] = last[i] - 256 - UDF_SB_SESSION(sb); 673 } else if (location == udf_variable_to_fixed(last[i]) - UDF_SB_SESSION(sb)) { 674 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV); 675 lastblock = UDF_SB_ANCHOR(sb)[0] = udf_variable_to_fixed(last[i]) - UDF_SB_SESSION(sb); 676 UDF_SB_ANCHOR(sb)[1] = lastblock - 256 - UDF_SB_SESSION(sb); 677 } else { 678 udf_debug("Anchor found at block %d, location mismatch %d.\n", 679 last[i], location); 680 } 681 } else if (ident == TAG_IDENT_FE || ident == TAG_IDENT_EFE) { 682 lastblock = last[i]; 683 UDF_SB_ANCHOR(sb)[3] = 512; 684 } else { 685 if (last[i] < 256 || !(bh = sb_bread(sb, last[i] - 256))) { 686 ident = location = 0; 687 } else { 688 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent); 689 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation); 690 brelse(bh); 691 } 692 693 if (ident == TAG_IDENT_AVDP && 694 location == last[i] - 256 - UDF_SB_SESSION(sb)) { 695 lastblock = last[i]; 696 UDF_SB_ANCHOR(sb)[1] = last[i] - 256; 697 } else { 698 if (last[i] < 312 + UDF_SB_SESSION(sb) || 699 !(bh = sb_bread(sb, last[i] - 312 - UDF_SB_SESSION(sb)))) { 700 ident = location = 0; 701 } else { 702 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent); 703 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation); 704 brelse(bh); 705 } 706 707 if (ident == TAG_IDENT_AVDP && 708 location == udf_variable_to_fixed(last[i]) - 256) { 709 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV); 710 lastblock = udf_variable_to_fixed(last[i]); 711 UDF_SB_ANCHOR(sb)[1] = lastblock - 256; 712 } 713 } 714 } 715 } 716 } 717 718 if (!lastblock) { 719 /* We havn't found the lastblock. check 312 */ 720 if ((bh = sb_bread(sb, 312 + UDF_SB_SESSION(sb)))) { 721 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent); 722 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation); 723 brelse(bh); 724 725 if (ident == TAG_IDENT_AVDP && location == 256) 726 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV); 727 } 728 } 729 730 for (i = 0; i < ARRAY_SIZE(UDF_SB_ANCHOR(sb)); i++) { 731 if (UDF_SB_ANCHOR(sb)[i]) { 732 if (!(bh = udf_read_tagged(sb, UDF_SB_ANCHOR(sb)[i], 733 UDF_SB_ANCHOR(sb)[i], &ident))) { 734 UDF_SB_ANCHOR(sb)[i] = 0; 735 } else { 736 brelse(bh); 737 if ((ident != TAG_IDENT_AVDP) && 738 (i || (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE))) { 739 UDF_SB_ANCHOR(sb)[i] = 0; 740 } 741 } 742 } 743 } 744 745 UDF_SB_LASTBLOCK(sb) = lastblock; 746 } 747 748 static int udf_find_fileset(struct super_block *sb, kernel_lb_addr *fileset, kernel_lb_addr *root) 749 { 750 struct buffer_head *bh = NULL; 751 long lastblock; 752 uint16_t ident; 753 754 if (fileset->logicalBlockNum != 0xFFFFFFFF || 755 fileset->partitionReferenceNum != 0xFFFF) { 756 bh = udf_read_ptagged(sb, *fileset, 0, &ident); 757 758 if (!bh) { 759 return 1; 760 } else if (ident != TAG_IDENT_FSD) { 761 brelse(bh); 762 return 1; 763 } 764 765 } 766 767 if (!bh) { /* Search backwards through the partitions */ 768 kernel_lb_addr newfileset; 769 770 /* --> cvg: FIXME - is it reasonable? */ 771 return 1; 772 773 for (newfileset.partitionReferenceNum = UDF_SB_NUMPARTS(sb) - 1; 774 (newfileset.partitionReferenceNum != 0xFFFF && 775 fileset->logicalBlockNum == 0xFFFFFFFF && 776 fileset->partitionReferenceNum == 0xFFFF); 777 newfileset.partitionReferenceNum--) { 778 lastblock = UDF_SB_PARTLEN(sb, newfileset.partitionReferenceNum); 779 newfileset.logicalBlockNum = 0; 780 781 do { 782 bh = udf_read_ptagged(sb, newfileset, 0, &ident); 783 if (!bh) { 784 newfileset.logicalBlockNum++; 785 continue; 786 } 787 788 switch (ident) { 789 case TAG_IDENT_SBD: 790 { 791 struct spaceBitmapDesc *sp; 792 sp = (struct spaceBitmapDesc *)bh->b_data; 793 newfileset.logicalBlockNum += 1 + 794 ((le32_to_cpu(sp->numOfBytes) + 795 sizeof(struct spaceBitmapDesc) - 1) 796 >> sb->s_blocksize_bits); 797 brelse(bh); 798 break; 799 } 800 case TAG_IDENT_FSD: 801 *fileset = newfileset; 802 break; 803 default: 804 newfileset.logicalBlockNum++; 805 brelse(bh); 806 bh = NULL; 807 break; 808 } 809 } while (newfileset.logicalBlockNum < lastblock && 810 fileset->logicalBlockNum == 0xFFFFFFFF && 811 fileset->partitionReferenceNum == 0xFFFF); 812 } 813 } 814 815 if ((fileset->logicalBlockNum != 0xFFFFFFFF || 816 fileset->partitionReferenceNum != 0xFFFF) && bh) { 817 udf_debug("Fileset at block=%d, partition=%d\n", 818 fileset->logicalBlockNum, 819 fileset->partitionReferenceNum); 820 821 UDF_SB_PARTITION(sb) = fileset->partitionReferenceNum; 822 udf_load_fileset(sb, bh, root); 823 brelse(bh); 824 return 0; 825 } 826 return 1; 827 } 828 829 static void udf_load_pvoldesc(struct super_block *sb, struct buffer_head *bh) 830 { 831 struct primaryVolDesc *pvoldesc; 832 time_t recording; 833 long recording_usec; 834 struct ustr instr; 835 struct ustr outstr; 836 837 pvoldesc = (struct primaryVolDesc *)bh->b_data; 838 839 if (udf_stamp_to_time(&recording, &recording_usec, 840 lets_to_cpu(pvoldesc->recordingDateAndTime))) { 841 kernel_timestamp ts; 842 ts = lets_to_cpu(pvoldesc->recordingDateAndTime); 843 udf_debug("recording time %ld/%ld, %04u/%02u/%02u %02u:%02u (%x)\n", 844 recording, recording_usec, 845 ts.year, ts.month, ts.day, ts.hour, 846 ts.minute, ts.typeAndTimezone); 847 UDF_SB_RECORDTIME(sb).tv_sec = recording; 848 UDF_SB_RECORDTIME(sb).tv_nsec = recording_usec * 1000; 849 } 850 851 if (!udf_build_ustr(&instr, pvoldesc->volIdent, 32)) { 852 if (udf_CS0toUTF8(&outstr, &instr)) { 853 strncpy(UDF_SB_VOLIDENT(sb), outstr.u_name, 854 outstr.u_len > 31 ? 31 : outstr.u_len); 855 udf_debug("volIdent[] = '%s'\n", UDF_SB_VOLIDENT(sb)); 856 } 857 } 858 859 if (!udf_build_ustr(&instr, pvoldesc->volSetIdent, 128)) { 860 if (udf_CS0toUTF8(&outstr, &instr)) 861 udf_debug("volSetIdent[] = '%s'\n", outstr.u_name); 862 } 863 } 864 865 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh, 866 kernel_lb_addr *root) 867 { 868 struct fileSetDesc *fset; 869 870 fset = (struct fileSetDesc *)bh->b_data; 871 872 *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation); 873 874 UDF_SB_SERIALNUM(sb) = le16_to_cpu(fset->descTag.tagSerialNum); 875 876 udf_debug("Rootdir at block=%d, partition=%d\n", 877 root->logicalBlockNum, root->partitionReferenceNum); 878 } 879 880 static int udf_load_partdesc(struct super_block *sb, struct buffer_head *bh) 881 { 882 struct partitionDesc *p; 883 int i; 884 885 p = (struct partitionDesc *)bh->b_data; 886 887 for (i = 0; i < UDF_SB_NUMPARTS(sb); i++) { 888 udf_debug("Searching map: (%d == %d)\n", 889 UDF_SB_PARTMAPS(sb)[i].s_partition_num, le16_to_cpu(p->partitionNumber)); 890 if (UDF_SB_PARTMAPS(sb)[i].s_partition_num == le16_to_cpu(p->partitionNumber)) { 891 UDF_SB_PARTLEN(sb,i) = le32_to_cpu(p->partitionLength); /* blocks */ 892 UDF_SB_PARTROOT(sb,i) = le32_to_cpu(p->partitionStartingLocation); 893 if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_READ_ONLY) 894 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_READ_ONLY; 895 if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_WRITE_ONCE) 896 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_WRITE_ONCE; 897 if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_REWRITABLE) 898 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_REWRITABLE; 899 if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_OVERWRITABLE) 900 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_OVERWRITABLE; 901 902 if (!strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) || 903 !strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03)) { 904 struct partitionHeaderDesc *phd; 905 906 phd = (struct partitionHeaderDesc *)(p->partitionContentsUse); 907 if (phd->unallocSpaceTable.extLength) { 908 kernel_lb_addr loc = { 909 .logicalBlockNum = le32_to_cpu(phd->unallocSpaceTable.extPosition), 910 .partitionReferenceNum = i, 911 }; 912 913 UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table = 914 udf_iget(sb, loc); 915 if (!UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table) { 916 udf_debug("cannot load unallocSpaceTable (part %d)\n", i); 917 return 1; 918 } 919 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_UNALLOC_TABLE; 920 udf_debug("unallocSpaceTable (part %d) @ %ld\n", 921 i, UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table->i_ino); 922 } 923 if (phd->unallocSpaceBitmap.extLength) { 924 UDF_SB_ALLOC_BITMAP(sb, i, s_uspace); 925 if (UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap != NULL) { 926 UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extLength = 927 le32_to_cpu(phd->unallocSpaceBitmap.extLength); 928 UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extPosition = 929 le32_to_cpu(phd->unallocSpaceBitmap.extPosition); 930 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_UNALLOC_BITMAP; 931 udf_debug("unallocSpaceBitmap (part %d) @ %d\n", 932 i, UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extPosition); 933 } 934 } 935 if (phd->partitionIntegrityTable.extLength) 936 udf_debug("partitionIntegrityTable (part %d)\n", i); 937 if (phd->freedSpaceTable.extLength) { 938 kernel_lb_addr loc = { 939 .logicalBlockNum = le32_to_cpu(phd->freedSpaceTable.extPosition), 940 .partitionReferenceNum = i, 941 }; 942 943 UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table = 944 udf_iget(sb, loc); 945 if (!UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table) { 946 udf_debug("cannot load freedSpaceTable (part %d)\n", i); 947 return 1; 948 } 949 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_FREED_TABLE; 950 udf_debug("freedSpaceTable (part %d) @ %ld\n", 951 i, UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table->i_ino); 952 } 953 if (phd->freedSpaceBitmap.extLength) { 954 UDF_SB_ALLOC_BITMAP(sb, i, s_fspace); 955 if (UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap != NULL) { 956 UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extLength = 957 le32_to_cpu(phd->freedSpaceBitmap.extLength); 958 UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extPosition = 959 le32_to_cpu(phd->freedSpaceBitmap.extPosition); 960 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_FREED_BITMAP; 961 udf_debug("freedSpaceBitmap (part %d) @ %d\n", 962 i, UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extPosition); 963 } 964 } 965 } 966 break; 967 } 968 } 969 if (i == UDF_SB_NUMPARTS(sb)) { 970 udf_debug("Partition (%d) not found in partition map\n", 971 le16_to_cpu(p->partitionNumber)); 972 } else { 973 udf_debug("Partition (%d:%d type %x) starts at physical %d, block length %d\n", 974 le16_to_cpu(p->partitionNumber), i, UDF_SB_PARTTYPE(sb,i), 975 UDF_SB_PARTROOT(sb,i), UDF_SB_PARTLEN(sb,i)); 976 } 977 return 0; 978 } 979 980 static int udf_load_logicalvol(struct super_block *sb, struct buffer_head *bh, 981 kernel_lb_addr *fileset) 982 { 983 struct logicalVolDesc *lvd; 984 int i, j, offset; 985 uint8_t type; 986 987 lvd = (struct logicalVolDesc *)bh->b_data; 988 989 UDF_SB_ALLOC_PARTMAPS(sb, le32_to_cpu(lvd->numPartitionMaps)); 990 991 for (i = 0, offset = 0; 992 i < UDF_SB_NUMPARTS(sb) && offset < le32_to_cpu(lvd->mapTableLength); 993 i++, offset += ((struct genericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapLength) { 994 type = ((struct genericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapType; 995 if (type == 1) { 996 struct genericPartitionMap1 *gpm1 = (struct genericPartitionMap1 *)&(lvd->partitionMaps[offset]); 997 UDF_SB_PARTTYPE(sb,i) = UDF_TYPE1_MAP15; 998 UDF_SB_PARTVSN(sb,i) = le16_to_cpu(gpm1->volSeqNum); 999 UDF_SB_PARTNUM(sb,i) = le16_to_cpu(gpm1->partitionNum); 1000 UDF_SB_PARTFUNC(sb,i) = NULL; 1001 } else if (type == 2) { 1002 struct udfPartitionMap2 *upm2 = (struct udfPartitionMap2 *)&(lvd->partitionMaps[offset]); 1003 if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL, strlen(UDF_ID_VIRTUAL))) { 1004 if (le16_to_cpu(((__le16 *)upm2->partIdent.identSuffix)[0]) == 0x0150) { 1005 UDF_SB_PARTTYPE(sb,i) = UDF_VIRTUAL_MAP15; 1006 UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_virt15; 1007 } else if (le16_to_cpu(((__le16 *)upm2->partIdent.identSuffix)[0]) == 0x0200) { 1008 UDF_SB_PARTTYPE(sb,i) = UDF_VIRTUAL_MAP20; 1009 UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_virt20; 1010 } 1011 } else if (!strncmp(upm2->partIdent.ident, UDF_ID_SPARABLE, strlen(UDF_ID_SPARABLE))) { 1012 uint32_t loc; 1013 uint16_t ident; 1014 struct sparingTable *st; 1015 struct sparablePartitionMap *spm = (struct sparablePartitionMap *)&(lvd->partitionMaps[offset]); 1016 1017 UDF_SB_PARTTYPE(sb,i) = UDF_SPARABLE_MAP15; 1018 UDF_SB_TYPESPAR(sb,i).s_packet_len = le16_to_cpu(spm->packetLength); 1019 for (j = 0; j < spm->numSparingTables; j++) { 1020 loc = le32_to_cpu(spm->locSparingTable[j]); 1021 UDF_SB_TYPESPAR(sb,i).s_spar_map[j] = 1022 udf_read_tagged(sb, loc, loc, &ident); 1023 if (UDF_SB_TYPESPAR(sb,i).s_spar_map[j] != NULL) { 1024 st = (struct sparingTable *)UDF_SB_TYPESPAR(sb,i).s_spar_map[j]->b_data; 1025 if (ident != 0 || 1026 strncmp(st->sparingIdent.ident, UDF_ID_SPARING, strlen(UDF_ID_SPARING))) { 1027 brelse(UDF_SB_TYPESPAR(sb,i).s_spar_map[j]); 1028 UDF_SB_TYPESPAR(sb,i).s_spar_map[j] = NULL; 1029 } 1030 } 1031 } 1032 UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_spar15; 1033 } else { 1034 udf_debug("Unknown ident: %s\n", upm2->partIdent.ident); 1035 continue; 1036 } 1037 UDF_SB_PARTVSN(sb,i) = le16_to_cpu(upm2->volSeqNum); 1038 UDF_SB_PARTNUM(sb,i) = le16_to_cpu(upm2->partitionNum); 1039 } 1040 udf_debug("Partition (%d:%d) type %d on volume %d\n", 1041 i, UDF_SB_PARTNUM(sb,i), type, UDF_SB_PARTVSN(sb,i)); 1042 } 1043 1044 if (fileset) { 1045 long_ad *la = (long_ad *)&(lvd->logicalVolContentsUse[0]); 1046 1047 *fileset = lelb_to_cpu(la->extLocation); 1048 udf_debug("FileSet found in LogicalVolDesc at block=%d, partition=%d\n", 1049 fileset->logicalBlockNum, 1050 fileset->partitionReferenceNum); 1051 } 1052 if (lvd->integritySeqExt.extLength) 1053 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt)); 1054 1055 return 0; 1056 } 1057 1058 /* 1059 * udf_load_logicalvolint 1060 * 1061 */ 1062 static void udf_load_logicalvolint(struct super_block *sb, kernel_extent_ad loc) 1063 { 1064 struct buffer_head *bh = NULL; 1065 uint16_t ident; 1066 1067 while (loc.extLength > 0 && 1068 (bh = udf_read_tagged(sb, loc.extLocation, 1069 loc.extLocation, &ident)) && 1070 ident == TAG_IDENT_LVID) { 1071 UDF_SB_LVIDBH(sb) = bh; 1072 1073 if (UDF_SB_LVID(sb)->nextIntegrityExt.extLength) 1074 udf_load_logicalvolint(sb, leea_to_cpu(UDF_SB_LVID(sb)->nextIntegrityExt)); 1075 1076 if (UDF_SB_LVIDBH(sb) != bh) 1077 brelse(bh); 1078 loc.extLength -= sb->s_blocksize; 1079 loc.extLocation++; 1080 } 1081 if (UDF_SB_LVIDBH(sb) != bh) 1082 brelse(bh); 1083 } 1084 1085 /* 1086 * udf_process_sequence 1087 * 1088 * PURPOSE 1089 * Process a main/reserve volume descriptor sequence. 1090 * 1091 * PRE-CONDITIONS 1092 * sb Pointer to _locked_ superblock. 1093 * block First block of first extent of the sequence. 1094 * lastblock Lastblock of first extent of the sequence. 1095 * 1096 * HISTORY 1097 * July 1, 1997 - Andrew E. Mileski 1098 * Written, tested, and released. 1099 */ 1100 static int udf_process_sequence(struct super_block *sb, long block, long lastblock, 1101 kernel_lb_addr *fileset) 1102 { 1103 struct buffer_head *bh = NULL; 1104 struct udf_vds_record vds[VDS_POS_LENGTH]; 1105 struct generic_desc *gd; 1106 struct volDescPtr *vdp; 1107 int done = 0; 1108 int i, j; 1109 uint32_t vdsn; 1110 uint16_t ident; 1111 long next_s = 0, next_e = 0; 1112 1113 memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH); 1114 1115 /* Read the main descriptor sequence */ 1116 for (; (!done && block <= lastblock); block++) { 1117 1118 bh = udf_read_tagged(sb, block, block, &ident); 1119 if (!bh) 1120 break; 1121 1122 /* Process each descriptor (ISO 13346 3/8.3-8.4) */ 1123 gd = (struct generic_desc *)bh->b_data; 1124 vdsn = le32_to_cpu(gd->volDescSeqNum); 1125 switch (ident) { 1126 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */ 1127 if (vdsn >= vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum) { 1128 vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum = vdsn; 1129 vds[VDS_POS_PRIMARY_VOL_DESC].block = block; 1130 } 1131 break; 1132 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */ 1133 if (vdsn >= vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum) { 1134 vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum = vdsn; 1135 vds[VDS_POS_VOL_DESC_PTR].block = block; 1136 1137 vdp = (struct volDescPtr *)bh->b_data; 1138 next_s = le32_to_cpu(vdp->nextVolDescSeqExt.extLocation); 1139 next_e = le32_to_cpu(vdp->nextVolDescSeqExt.extLength); 1140 next_e = next_e >> sb->s_blocksize_bits; 1141 next_e += next_s; 1142 } 1143 break; 1144 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */ 1145 if (vdsn >= vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum) { 1146 vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum = vdsn; 1147 vds[VDS_POS_IMP_USE_VOL_DESC].block = block; 1148 } 1149 break; 1150 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */ 1151 if (!vds[VDS_POS_PARTITION_DESC].block) 1152 vds[VDS_POS_PARTITION_DESC].block = block; 1153 break; 1154 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */ 1155 if (vdsn >= vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum) { 1156 vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum = vdsn; 1157 vds[VDS_POS_LOGICAL_VOL_DESC].block = block; 1158 } 1159 break; 1160 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */ 1161 if (vdsn >= vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum) { 1162 vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum = vdsn; 1163 vds[VDS_POS_UNALLOC_SPACE_DESC].block = block; 1164 } 1165 break; 1166 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */ 1167 vds[VDS_POS_TERMINATING_DESC].block = block; 1168 if (next_e) { 1169 block = next_s; 1170 lastblock = next_e; 1171 next_s = next_e = 0; 1172 } else { 1173 done = 1; 1174 } 1175 break; 1176 } 1177 brelse(bh); 1178 } 1179 for (i = 0; i < VDS_POS_LENGTH; i++) { 1180 if (vds[i].block) { 1181 bh = udf_read_tagged(sb, vds[i].block, vds[i].block, &ident); 1182 1183 if (i == VDS_POS_PRIMARY_VOL_DESC) { 1184 udf_load_pvoldesc(sb, bh); 1185 } else if (i == VDS_POS_LOGICAL_VOL_DESC) { 1186 udf_load_logicalvol(sb, bh, fileset); 1187 } else if (i == VDS_POS_PARTITION_DESC) { 1188 struct buffer_head *bh2 = NULL; 1189 if (udf_load_partdesc(sb, bh)) { 1190 brelse(bh); 1191 return 1; 1192 } 1193 for (j = vds[i].block + 1; j < vds[VDS_POS_TERMINATING_DESC].block; j++) { 1194 bh2 = udf_read_tagged(sb, j, j, &ident); 1195 gd = (struct generic_desc *)bh2->b_data; 1196 if (ident == TAG_IDENT_PD) 1197 if (udf_load_partdesc(sb, bh2)) { 1198 brelse(bh); 1199 brelse(bh2); 1200 return 1; 1201 } 1202 brelse(bh2); 1203 } 1204 } 1205 brelse(bh); 1206 } 1207 } 1208 1209 return 0; 1210 } 1211 1212 /* 1213 * udf_check_valid() 1214 */ 1215 static int udf_check_valid(struct super_block *sb, int novrs, int silent) 1216 { 1217 long block; 1218 1219 if (novrs) { 1220 udf_debug("Validity check skipped because of novrs option\n"); 1221 return 0; 1222 } 1223 /* Check that it is NSR02 compliant */ 1224 /* Process any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */ 1225 else if ((block = udf_vrs(sb, silent)) == -1) { 1226 udf_debug("Failed to read byte 32768. Assuming open disc. " 1227 "Skipping validity check\n"); 1228 if (!UDF_SB_LASTBLOCK(sb)) 1229 UDF_SB_LASTBLOCK(sb) = udf_get_last_block(sb); 1230 return 0; 1231 } else { 1232 return !block; 1233 } 1234 } 1235 1236 static int udf_load_partition(struct super_block *sb, kernel_lb_addr *fileset) 1237 { 1238 struct anchorVolDescPtr *anchor; 1239 uint16_t ident; 1240 struct buffer_head *bh; 1241 long main_s, main_e, reserve_s, reserve_e; 1242 int i, j; 1243 1244 if (!sb) 1245 return 1; 1246 1247 for (i = 0; i < ARRAY_SIZE(UDF_SB_ANCHOR(sb)); i++) { 1248 if (UDF_SB_ANCHOR(sb)[i] && 1249 (bh = udf_read_tagged(sb, UDF_SB_ANCHOR(sb)[i], 1250 UDF_SB_ANCHOR(sb)[i], &ident))) { 1251 anchor = (struct anchorVolDescPtr *)bh->b_data; 1252 1253 /* Locate the main sequence */ 1254 main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation); 1255 main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength ); 1256 main_e = main_e >> sb->s_blocksize_bits; 1257 main_e += main_s; 1258 1259 /* Locate the reserve sequence */ 1260 reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation); 1261 reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength); 1262 reserve_e = reserve_e >> sb->s_blocksize_bits; 1263 reserve_e += reserve_s; 1264 1265 brelse(bh); 1266 1267 /* Process the main & reserve sequences */ 1268 /* responsible for finding the PartitionDesc(s) */ 1269 if (!(udf_process_sequence(sb, main_s, main_e, fileset) && 1270 udf_process_sequence(sb, reserve_s, reserve_e, fileset))) { 1271 break; 1272 } 1273 } 1274 } 1275 1276 if (i == ARRAY_SIZE(UDF_SB_ANCHOR(sb))) { 1277 udf_debug("No Anchor block found\n"); 1278 return 1; 1279 } else 1280 udf_debug("Using anchor in block %d\n", UDF_SB_ANCHOR(sb)[i]); 1281 1282 for (i = 0; i < UDF_SB_NUMPARTS(sb); i++) { 1283 kernel_lb_addr uninitialized_var(ino); 1284 switch (UDF_SB_PARTTYPE(sb, i)) { 1285 case UDF_VIRTUAL_MAP15: 1286 case UDF_VIRTUAL_MAP20: 1287 if (!UDF_SB_LASTBLOCK(sb)) { 1288 UDF_SB_LASTBLOCK(sb) = udf_get_last_block(sb); 1289 udf_find_anchor(sb); 1290 } 1291 1292 if (!UDF_SB_LASTBLOCK(sb)) { 1293 udf_debug("Unable to determine Lastblock (For " 1294 "Virtual Partition)\n"); 1295 return 1; 1296 } 1297 1298 for (j = 0; j < UDF_SB_NUMPARTS(sb); j++) { 1299 if (j != i && 1300 UDF_SB_PARTVSN(sb, i) == UDF_SB_PARTVSN(sb, j) && 1301 UDF_SB_PARTNUM(sb, i) == UDF_SB_PARTNUM(sb, j)) { 1302 ino.partitionReferenceNum = j; 1303 ino.logicalBlockNum = UDF_SB_LASTBLOCK(sb) - UDF_SB_PARTROOT(sb, j); 1304 break; 1305 } 1306 } 1307 1308 if (j == UDF_SB_NUMPARTS(sb)) 1309 return 1; 1310 1311 if (!(UDF_SB_VAT(sb) = udf_iget(sb, ino))) 1312 return 1; 1313 1314 if (UDF_SB_PARTTYPE(sb, i) == UDF_VIRTUAL_MAP15) { 1315 UDF_SB_TYPEVIRT(sb, i).s_start_offset = 1316 udf_ext0_offset(UDF_SB_VAT(sb)); 1317 UDF_SB_TYPEVIRT(sb, i).s_num_entries = 1318 (UDF_SB_VAT(sb)->i_size - 36) >> 2; 1319 } else if (UDF_SB_PARTTYPE(sb, i) == UDF_VIRTUAL_MAP20) { 1320 struct buffer_head *bh = NULL; 1321 uint32_t pos; 1322 1323 pos = udf_block_map(UDF_SB_VAT(sb), 0); 1324 bh = sb_bread(sb, pos); 1325 if (!bh) 1326 return 1; 1327 UDF_SB_TYPEVIRT(sb, i).s_start_offset = 1328 le16_to_cpu(((struct virtualAllocationTable20 *)bh->b_data + 1329 udf_ext0_offset(UDF_SB_VAT(sb)))->lengthHeader) + 1330 udf_ext0_offset(UDF_SB_VAT(sb)); 1331 UDF_SB_TYPEVIRT(sb, i).s_num_entries = (UDF_SB_VAT(sb)->i_size - 1332 UDF_SB_TYPEVIRT(sb, i).s_start_offset) >> 2; 1333 brelse(bh); 1334 } 1335 UDF_SB_PARTROOT(sb, i) = udf_get_pblock(sb, 0, i, 0); 1336 UDF_SB_PARTLEN(sb, i) = UDF_SB_PARTLEN(sb, ino.partitionReferenceNum); 1337 } 1338 } 1339 return 0; 1340 } 1341 1342 static void udf_open_lvid(struct super_block *sb) 1343 { 1344 if (UDF_SB_LVIDBH(sb)) { 1345 int i; 1346 kernel_timestamp cpu_time; 1347 1348 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX; 1349 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[1] = UDF_OS_ID_LINUX; 1350 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME)) 1351 UDF_SB_LVID(sb)->recordingDateAndTime = cpu_to_lets(cpu_time); 1352 UDF_SB_LVID(sb)->integrityType = LVID_INTEGRITY_TYPE_OPEN; 1353 1354 UDF_SB_LVID(sb)->descTag.descCRC = cpu_to_le16(udf_crc((char *)UDF_SB_LVID(sb) + sizeof(tag), 1355 le16_to_cpu(UDF_SB_LVID(sb)->descTag.descCRCLength), 0)); 1356 1357 UDF_SB_LVID(sb)->descTag.tagChecksum = 0; 1358 for (i = 0; i < 16; i++) 1359 if (i != 4) 1360 UDF_SB_LVID(sb)->descTag.tagChecksum += 1361 ((uint8_t *) &(UDF_SB_LVID(sb)->descTag))[i]; 1362 1363 mark_buffer_dirty(UDF_SB_LVIDBH(sb)); 1364 } 1365 } 1366 1367 static void udf_close_lvid(struct super_block *sb) 1368 { 1369 kernel_timestamp cpu_time; 1370 int i; 1371 1372 if (UDF_SB_LVIDBH(sb) && 1373 UDF_SB_LVID(sb)->integrityType == LVID_INTEGRITY_TYPE_OPEN) { 1374 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX; 1375 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[1] = UDF_OS_ID_LINUX; 1376 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME)) 1377 UDF_SB_LVID(sb)->recordingDateAndTime = cpu_to_lets(cpu_time); 1378 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(UDF_SB_LVIDIU(sb)->maxUDFWriteRev)) 1379 UDF_SB_LVIDIU(sb)->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION); 1380 if (UDF_SB_UDFREV(sb) > le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev)) 1381 UDF_SB_LVIDIU(sb)->minUDFReadRev = cpu_to_le16(UDF_SB_UDFREV(sb)); 1382 if (UDF_SB_UDFREV(sb) > le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev)) 1383 UDF_SB_LVIDIU(sb)->minUDFWriteRev = cpu_to_le16(UDF_SB_UDFREV(sb)); 1384 UDF_SB_LVID(sb)->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE); 1385 1386 UDF_SB_LVID(sb)->descTag.descCRC = 1387 cpu_to_le16(udf_crc((char *)UDF_SB_LVID(sb) + sizeof(tag), 1388 le16_to_cpu(UDF_SB_LVID(sb)->descTag.descCRCLength), 0)); 1389 1390 UDF_SB_LVID(sb)->descTag.tagChecksum = 0; 1391 for (i = 0; i < 16; i++) 1392 if (i != 4) 1393 UDF_SB_LVID(sb)->descTag.tagChecksum += 1394 ((uint8_t *)&(UDF_SB_LVID(sb)->descTag))[i]; 1395 1396 mark_buffer_dirty(UDF_SB_LVIDBH(sb)); 1397 } 1398 } 1399 1400 /* 1401 * udf_read_super 1402 * 1403 * PURPOSE 1404 * Complete the specified super block. 1405 * 1406 * PRE-CONDITIONS 1407 * sb Pointer to superblock to complete - never NULL. 1408 * sb->s_dev Device to read suberblock from. 1409 * options Pointer to mount options. 1410 * silent Silent flag. 1411 * 1412 * HISTORY 1413 * July 1, 1997 - Andrew E. Mileski 1414 * Written, tested, and released. 1415 */ 1416 static int udf_fill_super(struct super_block *sb, void *options, int silent) 1417 { 1418 int i; 1419 struct inode *inode = NULL; 1420 struct udf_options uopt; 1421 kernel_lb_addr rootdir, fileset; 1422 struct udf_sb_info *sbi; 1423 1424 uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT); 1425 uopt.uid = -1; 1426 uopt.gid = -1; 1427 uopt.umask = 0; 1428 1429 sbi = kmalloc(sizeof(struct udf_sb_info), GFP_KERNEL); 1430 if (!sbi) 1431 return -ENOMEM; 1432 1433 sb->s_fs_info = sbi; 1434 memset(UDF_SB(sb), 0x00, sizeof(struct udf_sb_info)); 1435 1436 mutex_init(&sbi->s_alloc_mutex); 1437 1438 if (!udf_parse_options((char *)options, &uopt)) 1439 goto error_out; 1440 1441 if (uopt.flags & (1 << UDF_FLAG_UTF8) && 1442 uopt.flags & (1 << UDF_FLAG_NLS_MAP)) { 1443 udf_error(sb, "udf_read_super", 1444 "utf8 cannot be combined with iocharset\n"); 1445 goto error_out; 1446 } 1447 #ifdef CONFIG_UDF_NLS 1448 if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) { 1449 uopt.nls_map = load_nls_default(); 1450 if (!uopt.nls_map) 1451 uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP); 1452 else 1453 udf_debug("Using default NLS map\n"); 1454 } 1455 #endif 1456 if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP))) 1457 uopt.flags |= (1 << UDF_FLAG_UTF8); 1458 1459 fileset.logicalBlockNum = 0xFFFFFFFF; 1460 fileset.partitionReferenceNum = 0xFFFF; 1461 1462 UDF_SB(sb)->s_flags = uopt.flags; 1463 UDF_SB(sb)->s_uid = uopt.uid; 1464 UDF_SB(sb)->s_gid = uopt.gid; 1465 UDF_SB(sb)->s_umask = uopt.umask; 1466 UDF_SB(sb)->s_nls_map = uopt.nls_map; 1467 1468 /* Set the block size for all transfers */ 1469 if (!udf_set_blocksize(sb, uopt.blocksize)) 1470 goto error_out; 1471 1472 if (uopt.session == 0xFFFFFFFF) 1473 UDF_SB_SESSION(sb) = udf_get_last_session(sb); 1474 else 1475 UDF_SB_SESSION(sb) = uopt.session; 1476 1477 udf_debug("Multi-session=%d\n", UDF_SB_SESSION(sb)); 1478 1479 UDF_SB_LASTBLOCK(sb) = uopt.lastblock; 1480 UDF_SB_ANCHOR(sb)[0] = UDF_SB_ANCHOR(sb)[1] = 0; 1481 UDF_SB_ANCHOR(sb)[2] = uopt.anchor; 1482 UDF_SB_ANCHOR(sb)[3] = 256; 1483 1484 if (udf_check_valid(sb, uopt.novrs, silent)) { /* read volume recognition sequences */ 1485 printk("UDF-fs: No VRS found\n"); 1486 goto error_out; 1487 } 1488 1489 udf_find_anchor(sb); 1490 1491 /* Fill in the rest of the superblock */ 1492 sb->s_op = &udf_sb_ops; 1493 sb->dq_op = NULL; 1494 sb->s_dirt = 0; 1495 sb->s_magic = UDF_SUPER_MAGIC; 1496 sb->s_time_gran = 1000; 1497 1498 if (udf_load_partition(sb, &fileset)) { 1499 printk("UDF-fs: No partition found (1)\n"); 1500 goto error_out; 1501 } 1502 1503 udf_debug("Lastblock=%d\n", UDF_SB_LASTBLOCK(sb)); 1504 1505 if (UDF_SB_LVIDBH(sb)) { 1506 uint16_t minUDFReadRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev); 1507 uint16_t minUDFWriteRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev); 1508 /* uint16_t maxUDFWriteRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->maxUDFWriteRev); */ 1509 1510 if (minUDFReadRev > UDF_MAX_READ_VERSION) { 1511 printk("UDF-fs: minUDFReadRev=%x (max is %x)\n", 1512 le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev), 1513 UDF_MAX_READ_VERSION); 1514 goto error_out; 1515 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION) { 1516 sb->s_flags |= MS_RDONLY; 1517 } 1518 1519 UDF_SB_UDFREV(sb) = minUDFWriteRev; 1520 1521 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE) 1522 UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE); 1523 if (minUDFReadRev >= UDF_VERS_USE_STREAMS) 1524 UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS); 1525 } 1526 1527 if (!UDF_SB_NUMPARTS(sb)) { 1528 printk("UDF-fs: No partition found (2)\n"); 1529 goto error_out; 1530 } 1531 1532 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_READ_ONLY) { 1533 printk("UDF-fs: Partition marked readonly; forcing readonly mount\n"); 1534 sb->s_flags |= MS_RDONLY; 1535 } 1536 1537 if (udf_find_fileset(sb, &fileset, &rootdir)) { 1538 printk("UDF-fs: No fileset found\n"); 1539 goto error_out; 1540 } 1541 1542 if (!silent) { 1543 kernel_timestamp ts; 1544 udf_time_to_stamp(&ts, UDF_SB_RECORDTIME(sb)); 1545 udf_info("UDF %s (%s) Mounting volume '%s', " 1546 "timestamp %04u/%02u/%02u %02u:%02u (%x)\n", 1547 UDFFS_VERSION, UDFFS_DATE, 1548 UDF_SB_VOLIDENT(sb), ts.year, ts.month, ts.day, ts.hour, ts.minute, 1549 ts.typeAndTimezone); 1550 } 1551 if (!(sb->s_flags & MS_RDONLY)) 1552 udf_open_lvid(sb); 1553 1554 /* Assign the root inode */ 1555 /* assign inodes by physical block number */ 1556 /* perhaps it's not extensible enough, but for now ... */ 1557 inode = udf_iget(sb, rootdir); 1558 if (!inode) { 1559 printk("UDF-fs: Error in udf_iget, block=%d, partition=%d\n", 1560 rootdir.logicalBlockNum, rootdir.partitionReferenceNum); 1561 goto error_out; 1562 } 1563 1564 /* Allocate a dentry for the root inode */ 1565 sb->s_root = d_alloc_root(inode); 1566 if (!sb->s_root) { 1567 printk("UDF-fs: Couldn't allocate root dentry\n"); 1568 iput(inode); 1569 goto error_out; 1570 } 1571 sb->s_maxbytes = MAX_LFS_FILESIZE; 1572 return 0; 1573 1574 error_out: 1575 if (UDF_SB_VAT(sb)) 1576 iput(UDF_SB_VAT(sb)); 1577 if (UDF_SB_NUMPARTS(sb)) { 1578 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE) 1579 iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table); 1580 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE) 1581 iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table); 1582 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP) 1583 UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb), s_uspace); 1584 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP) 1585 UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb), s_fspace); 1586 if (UDF_SB_PARTTYPE(sb, UDF_SB_PARTITION(sb)) == UDF_SPARABLE_MAP15) { 1587 for (i = 0; i < 4; i++) 1588 brelse(UDF_SB_TYPESPAR(sb, UDF_SB_PARTITION(sb)).s_spar_map[i]); 1589 } 1590 } 1591 #ifdef CONFIG_UDF_NLS 1592 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP)) 1593 unload_nls(UDF_SB(sb)->s_nls_map); 1594 #endif 1595 if (!(sb->s_flags & MS_RDONLY)) 1596 udf_close_lvid(sb); 1597 brelse(UDF_SB_LVIDBH(sb)); 1598 UDF_SB_FREE(sb); 1599 kfree(sbi); 1600 sb->s_fs_info = NULL; 1601 1602 return -EINVAL; 1603 } 1604 1605 void udf_error(struct super_block *sb, const char *function, 1606 const char *fmt, ...) 1607 { 1608 va_list args; 1609 1610 if (!(sb->s_flags & MS_RDONLY)) { 1611 /* mark sb error */ 1612 sb->s_dirt = 1; 1613 } 1614 va_start(args, fmt); 1615 vsnprintf(error_buf, sizeof(error_buf), fmt, args); 1616 va_end(args); 1617 printk (KERN_CRIT "UDF-fs error (device %s): %s: %s\n", 1618 sb->s_id, function, error_buf); 1619 } 1620 1621 void udf_warning(struct super_block *sb, const char *function, 1622 const char *fmt, ...) 1623 { 1624 va_list args; 1625 1626 va_start(args, fmt); 1627 vsnprintf(error_buf, sizeof(error_buf), fmt, args); 1628 va_end(args); 1629 printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n", 1630 sb->s_id, function, error_buf); 1631 } 1632 1633 /* 1634 * udf_put_super 1635 * 1636 * PURPOSE 1637 * Prepare for destruction of the superblock. 1638 * 1639 * DESCRIPTION 1640 * Called before the filesystem is unmounted. 1641 * 1642 * HISTORY 1643 * July 1, 1997 - Andrew E. Mileski 1644 * Written, tested, and released. 1645 */ 1646 static void udf_put_super(struct super_block *sb) 1647 { 1648 int i; 1649 1650 if (UDF_SB_VAT(sb)) 1651 iput(UDF_SB_VAT(sb)); 1652 if (UDF_SB_NUMPARTS(sb)) { 1653 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE) 1654 iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table); 1655 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE) 1656 iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table); 1657 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP) 1658 UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb), s_uspace); 1659 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP) 1660 UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb), s_fspace); 1661 if (UDF_SB_PARTTYPE(sb, UDF_SB_PARTITION(sb)) == UDF_SPARABLE_MAP15) { 1662 for (i = 0; i < 4; i++) 1663 brelse(UDF_SB_TYPESPAR(sb, UDF_SB_PARTITION(sb)).s_spar_map[i]); 1664 } 1665 } 1666 #ifdef CONFIG_UDF_NLS 1667 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP)) 1668 unload_nls(UDF_SB(sb)->s_nls_map); 1669 #endif 1670 if (!(sb->s_flags & MS_RDONLY)) 1671 udf_close_lvid(sb); 1672 brelse(UDF_SB_LVIDBH(sb)); 1673 UDF_SB_FREE(sb); 1674 kfree(sb->s_fs_info); 1675 sb->s_fs_info = NULL; 1676 } 1677 1678 /* 1679 * udf_stat_fs 1680 * 1681 * PURPOSE 1682 * Return info about the filesystem. 1683 * 1684 * DESCRIPTION 1685 * Called by sys_statfs() 1686 * 1687 * HISTORY 1688 * July 1, 1997 - Andrew E. Mileski 1689 * Written, tested, and released. 1690 */ 1691 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf) 1692 { 1693 struct super_block *sb = dentry->d_sb; 1694 1695 buf->f_type = UDF_SUPER_MAGIC; 1696 buf->f_bsize = sb->s_blocksize; 1697 buf->f_blocks = UDF_SB_PARTLEN(sb, UDF_SB_PARTITION(sb)); 1698 buf->f_bfree = udf_count_free(sb); 1699 buf->f_bavail = buf->f_bfree; 1700 buf->f_files = (UDF_SB_LVIDBH(sb) ? 1701 (le32_to_cpu(UDF_SB_LVIDIU(sb)->numFiles) + 1702 le32_to_cpu(UDF_SB_LVIDIU(sb)->numDirs)) : 0) + buf->f_bfree; 1703 buf->f_ffree = buf->f_bfree; 1704 /* __kernel_fsid_t f_fsid */ 1705 buf->f_namelen = UDF_NAME_LEN - 2; 1706 1707 return 0; 1708 } 1709 1710 static unsigned char udf_bitmap_lookup[16] = { 1711 0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4 1712 }; 1713 1714 static unsigned int udf_count_free_bitmap(struct super_block *sb, struct udf_bitmap *bitmap) 1715 { 1716 struct buffer_head *bh = NULL; 1717 unsigned int accum = 0; 1718 int index; 1719 int block = 0, newblock; 1720 kernel_lb_addr loc; 1721 uint32_t bytes; 1722 uint8_t value; 1723 uint8_t *ptr; 1724 uint16_t ident; 1725 struct spaceBitmapDesc *bm; 1726 1727 lock_kernel(); 1728 1729 loc.logicalBlockNum = bitmap->s_extPosition; 1730 loc.partitionReferenceNum = UDF_SB_PARTITION(sb); 1731 bh = udf_read_ptagged(sb, loc, 0, &ident); 1732 1733 if (!bh) { 1734 printk(KERN_ERR "udf: udf_count_free failed\n"); 1735 goto out; 1736 } else if (ident != TAG_IDENT_SBD) { 1737 brelse(bh); 1738 printk(KERN_ERR "udf: udf_count_free failed\n"); 1739 goto out; 1740 } 1741 1742 bm = (struct spaceBitmapDesc *)bh->b_data; 1743 bytes = le32_to_cpu(bm->numOfBytes); 1744 index = sizeof(struct spaceBitmapDesc); /* offset in first block only */ 1745 ptr = (uint8_t *)bh->b_data; 1746 1747 while (bytes > 0) { 1748 while ((bytes > 0) && (index < sb->s_blocksize)) { 1749 value = ptr[index]; 1750 accum += udf_bitmap_lookup[value & 0x0f]; 1751 accum += udf_bitmap_lookup[value >> 4]; 1752 index++; 1753 bytes--; 1754 } 1755 if (bytes) { 1756 brelse(bh); 1757 newblock = udf_get_lb_pblock(sb, loc, ++block); 1758 bh = udf_tread(sb, newblock); 1759 if (!bh) { 1760 udf_debug("read failed\n"); 1761 goto out; 1762 } 1763 index = 0; 1764 ptr = (uint8_t *)bh->b_data; 1765 } 1766 } 1767 brelse(bh); 1768 1769 out: 1770 unlock_kernel(); 1771 1772 return accum; 1773 } 1774 1775 static unsigned int udf_count_free_table(struct super_block *sb, struct inode *table) 1776 { 1777 unsigned int accum = 0; 1778 uint32_t elen; 1779 kernel_lb_addr eloc; 1780 int8_t etype; 1781 struct extent_position epos; 1782 1783 lock_kernel(); 1784 1785 epos.block = UDF_I_LOCATION(table); 1786 epos.offset = sizeof(struct unallocSpaceEntry); 1787 epos.bh = NULL; 1788 1789 while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1) { 1790 accum += (elen >> table->i_sb->s_blocksize_bits); 1791 } 1792 brelse(epos.bh); 1793 1794 unlock_kernel(); 1795 1796 return accum; 1797 } 1798 1799 static unsigned int udf_count_free(struct super_block *sb) 1800 { 1801 unsigned int accum = 0; 1802 1803 if (UDF_SB_LVIDBH(sb)) { 1804 if (le32_to_cpu(UDF_SB_LVID(sb)->numOfPartitions) > UDF_SB_PARTITION(sb)) { 1805 accum = le32_to_cpu(UDF_SB_LVID(sb)->freeSpaceTable[UDF_SB_PARTITION(sb)]); 1806 if (accum == 0xFFFFFFFF) 1807 accum = 0; 1808 } 1809 } 1810 1811 if (accum) 1812 return accum; 1813 1814 if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP) { 1815 accum += udf_count_free_bitmap(sb, 1816 UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_bitmap); 1817 } 1818 if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP) { 1819 accum += udf_count_free_bitmap(sb, 1820 UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_bitmap); 1821 } 1822 if (accum) 1823 return accum; 1824 1825 if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE) { 1826 accum += udf_count_free_table(sb, 1827 UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table); 1828 } 1829 if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE) { 1830 accum += udf_count_free_table(sb, 1831 UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table); 1832 } 1833 1834 return accum; 1835 } 1836