1/** 2 * ldm - Support for Windows Logical Disk Manager (Dynamic Disks) 3 * 4 * Copyright (C) 2001,2002 Richard Russon <ldm@flatcap.org> 5 * Copyright (c) 2001-2007 Anton Altaparmakov 6 * Copyright (C) 2001,2002 Jakob Kemi <jakob.kemi@telia.com> 7 * 8 * Documentation is available at http://www.linux-ntfs.org/content/view/19/37/ 9 * 10 * This program is free software; you can redistribute it and/or modify it under 11 * the terms of the GNU General Public License as published by the Free Software 12 * Foundation; either version 2 of the License, or (at your option) any later 13 * version. 14 * 15 * This program is distributed in the hope that it will be useful, but WITHOUT 16 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 17 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more 18 * details. 19 * 20 * You should have received a copy of the GNU General Public License along with 21 * this program (in the main directory of the source in the file COPYING); if 22 * not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, 23 * Boston, MA 02111-1307 USA 24 */ 25 26#include <linux/slab.h> 27#include <linux/pagemap.h> 28#include <linux/stringify.h> 29#include "ldm.h" 30#include "check.h" 31#include "msdos.h" 32 33/** 34 * ldm_debug/info/error/crit - Output an error message 35 * @f: A printf format string containing the message 36 * @...: Variables to substitute into @f 37 * 38 * ldm_debug() writes a DEBUG level message to the syslog but only if the 39 * driver was compiled with debug enabled. Otherwise, the call turns into a NOP. 40 */ 41#ifndef CONFIG_LDM_DEBUG 42#define ldm_debug(...) do {} while (0) 43#else 44#define ldm_debug(f, a...) _ldm_printk (KERN_DEBUG, __FUNCTION__, f, ##a) 45#endif 46 47#define ldm_crit(f, a...) _ldm_printk (KERN_CRIT, __FUNCTION__, f, ##a) 48#define ldm_error(f, a...) _ldm_printk (KERN_ERR, __FUNCTION__, f, ##a) 49#define ldm_info(f, a...) _ldm_printk (KERN_INFO, __FUNCTION__, f, ##a) 50 51__attribute__ ((format (printf, 3, 4))) 52static void _ldm_printk (const char *level, const char *function, 53 const char *fmt, ...) 54{ 55 static char buf[128]; 56 va_list args; 57 58 va_start (args, fmt); 59 vsnprintf (buf, sizeof (buf), fmt, args); 60 va_end (args); 61 62 printk ("%s%s(): %s\n", level, function, buf); 63} 64 65/** 66 * ldm_parse_hexbyte - Convert a ASCII hex number to a byte 67 * @src: Pointer to at least 2 characters to convert. 68 * 69 * Convert a two character ASCII hex string to a number. 70 * 71 * Return: 0-255 Success, the byte was parsed correctly 72 * -1 Error, an invalid character was supplied 73 */ 74static int ldm_parse_hexbyte (const u8 *src) 75{ 76 unsigned int x; /* For correct wrapping */ 77 int h; 78 79 /* high part */ 80 if ((x = src[0] - '0') <= '9'-'0') h = x; 81 else if ((x = src[0] - 'a') <= 'f'-'a') h = x+10; 82 else if ((x = src[0] - 'A') <= 'F'-'A') h = x+10; 83 else return -1; 84 h <<= 4; 85 86 /* low part */ 87 if ((x = src[1] - '0') <= '9'-'0') return h | x; 88 if ((x = src[1] - 'a') <= 'f'-'a') return h | (x+10); 89 if ((x = src[1] - 'A') <= 'F'-'A') return h | (x+10); 90 return -1; 91} 92 93/** 94 * ldm_parse_guid - Convert GUID from ASCII to binary 95 * @src: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba 96 * @dest: Memory block to hold binary GUID (16 bytes) 97 * 98 * N.B. The GUID need not be NULL terminated. 99 * 100 * Return: 'true' @dest contains binary GUID 101 * 'false' @dest contents are undefined 102 */ 103static bool ldm_parse_guid (const u8 *src, u8 *dest) 104{ 105 static const int size[] = { 4, 2, 2, 2, 6 }; 106 int i, j, v; 107 108 if (src[8] != '-' || src[13] != '-' || 109 src[18] != '-' || src[23] != '-') 110 return false; 111 112 for (j = 0; j < 5; j++, src++) 113 for (i = 0; i < size[j]; i++, src+=2, *dest++ = v) 114 if ((v = ldm_parse_hexbyte (src)) < 0) 115 return false; 116 117 return true; 118} 119 120/** 121 * ldm_parse_privhead - Read the LDM Database PRIVHEAD structure 122 * @data: Raw database PRIVHEAD structure loaded from the device 123 * @ph: In-memory privhead structure in which to return parsed information 124 * 125 * This parses the LDM database PRIVHEAD structure supplied in @data and 126 * sets up the in-memory privhead structure @ph with the obtained information. 127 * 128 * Return: 'true' @ph contains the PRIVHEAD data 129 * 'false' @ph contents are undefined 130 */ 131static bool ldm_parse_privhead(const u8 *data, struct privhead *ph) 132{ 133 bool is_vista = false; 134 135 BUG_ON(!data || !ph); 136 if (MAGIC_PRIVHEAD != BE64(data)) { 137 ldm_error("Cannot find PRIVHEAD structure. LDM database is" 138 " corrupt. Aborting."); 139 return false; 140 } 141 ph->ver_major = BE16(data + 0x000C); 142 ph->ver_minor = BE16(data + 0x000E); 143 ph->logical_disk_start = BE64(data + 0x011B); 144 ph->logical_disk_size = BE64(data + 0x0123); 145 ph->config_start = BE64(data + 0x012B); 146 ph->config_size = BE64(data + 0x0133); 147 /* Version 2.11 is Win2k/XP and version 2.12 is Vista. */ 148 if (ph->ver_major == 2 && ph->ver_minor == 12) 149 is_vista = true; 150 if (!is_vista && (ph->ver_major != 2 || ph->ver_minor != 11)) { 151 ldm_error("Expected PRIVHEAD version 2.11 or 2.12, got %d.%d." 152 " Aborting.", ph->ver_major, ph->ver_minor); 153 return false; 154 } 155 ldm_debug("PRIVHEAD version %d.%d (Windows %s).", ph->ver_major, 156 ph->ver_minor, is_vista ? "Vista" : "2000/XP"); 157 if (ph->config_size != LDM_DB_SIZE) { /* 1 MiB in sectors. */ 158 /* Warn the user and continue, carefully. */ 159 ldm_info("Database is normally %u bytes, it claims to " 160 "be %llu bytes.", LDM_DB_SIZE, 161 (unsigned long long)ph->config_size); 162 } 163 if ((ph->logical_disk_size == 0) || (ph->logical_disk_start + 164 ph->logical_disk_size > ph->config_start)) { 165 ldm_error("PRIVHEAD disk size doesn't match real disk size"); 166 return false; 167 } 168 if (!ldm_parse_guid(data + 0x0030, ph->disk_id)) { 169 ldm_error("PRIVHEAD contains an invalid GUID."); 170 return false; 171 } 172 ldm_debug("Parsed PRIVHEAD successfully."); 173 return true; 174} 175 176/** 177 * ldm_parse_tocblock - Read the LDM Database TOCBLOCK structure 178 * @data: Raw database TOCBLOCK structure loaded from the device 179 * @toc: In-memory toc structure in which to return parsed information 180 * 181 * This parses the LDM Database TOCBLOCK (table of contents) structure supplied 182 * in @data and sets up the in-memory tocblock structure @toc with the obtained 183 * information. 184 * 185 * N.B. The *_start and *_size values returned in @toc are not range-checked. 186 * 187 * Return: 'true' @toc contains the TOCBLOCK data 188 * 'false' @toc contents are undefined 189 */ 190static bool ldm_parse_tocblock (const u8 *data, struct tocblock *toc) 191{ 192 BUG_ON (!data || !toc); 193 194 if (MAGIC_TOCBLOCK != BE64 (data)) { 195 ldm_crit ("Cannot find TOCBLOCK, database may be corrupt."); 196 return false; 197 } 198 strncpy (toc->bitmap1_name, data + 0x24, sizeof (toc->bitmap1_name)); 199 toc->bitmap1_name[sizeof (toc->bitmap1_name) - 1] = 0; 200 toc->bitmap1_start = BE64 (data + 0x2E); 201 toc->bitmap1_size = BE64 (data + 0x36); 202 203 if (strncmp (toc->bitmap1_name, TOC_BITMAP1, 204 sizeof (toc->bitmap1_name)) != 0) { 205 ldm_crit ("TOCBLOCK's first bitmap is '%s', should be '%s'.", 206 TOC_BITMAP1, toc->bitmap1_name); 207 return false; 208 } 209 strncpy (toc->bitmap2_name, data + 0x46, sizeof (toc->bitmap2_name)); 210 toc->bitmap2_name[sizeof (toc->bitmap2_name) - 1] = 0; 211 toc->bitmap2_start = BE64 (data + 0x50); 212 toc->bitmap2_size = BE64 (data + 0x58); 213 if (strncmp (toc->bitmap2_name, TOC_BITMAP2, 214 sizeof (toc->bitmap2_name)) != 0) { 215 ldm_crit ("TOCBLOCK's second bitmap is '%s', should be '%s'.", 216 TOC_BITMAP2, toc->bitmap2_name); 217 return false; 218 } 219 ldm_debug ("Parsed TOCBLOCK successfully."); 220 return true; 221} 222 223/** 224 * ldm_parse_vmdb - Read the LDM Database VMDB structure 225 * @data: Raw database VMDB structure loaded from the device 226 * @vm: In-memory vmdb structure in which to return parsed information 227 * 228 * This parses the LDM Database VMDB structure supplied in @data and sets up 229 * the in-memory vmdb structure @vm with the obtained information. 230 * 231 * N.B. The *_start, *_size and *_seq values will be range-checked later. 232 * 233 * Return: 'true' @vm contains VMDB info 234 * 'false' @vm contents are undefined 235 */ 236static bool ldm_parse_vmdb (const u8 *data, struct vmdb *vm) 237{ 238 BUG_ON (!data || !vm); 239 240 if (MAGIC_VMDB != BE32 (data)) { 241 ldm_crit ("Cannot find the VMDB, database may be corrupt."); 242 return false; 243 } 244 245 vm->ver_major = BE16 (data + 0x12); 246 vm->ver_minor = BE16 (data + 0x14); 247 if ((vm->ver_major != 4) || (vm->ver_minor != 10)) { 248 ldm_error ("Expected VMDB version %d.%d, got %d.%d. " 249 "Aborting.", 4, 10, vm->ver_major, vm->ver_minor); 250 return false; 251 } 252 253 vm->vblk_size = BE32 (data + 0x08); 254 vm->vblk_offset = BE32 (data + 0x0C); 255 vm->last_vblk_seq = BE32 (data + 0x04); 256 257 ldm_debug ("Parsed VMDB successfully."); 258 return true; 259} 260 261/** 262 * ldm_compare_privheads - Compare two privhead objects 263 * @ph1: First privhead 264 * @ph2: Second privhead 265 * 266 * This compares the two privhead structures @ph1 and @ph2. 267 * 268 * Return: 'true' Identical 269 * 'false' Different 270 */ 271static bool ldm_compare_privheads (const struct privhead *ph1, 272 const struct privhead *ph2) 273{ 274 BUG_ON (!ph1 || !ph2); 275 276 return ((ph1->ver_major == ph2->ver_major) && 277 (ph1->ver_minor == ph2->ver_minor) && 278 (ph1->logical_disk_start == ph2->logical_disk_start) && 279 (ph1->logical_disk_size == ph2->logical_disk_size) && 280 (ph1->config_start == ph2->config_start) && 281 (ph1->config_size == ph2->config_size) && 282 !memcmp (ph1->disk_id, ph2->disk_id, GUID_SIZE)); 283} 284 285/** 286 * ldm_compare_tocblocks - Compare two tocblock objects 287 * @toc1: First toc 288 * @toc2: Second toc 289 * 290 * This compares the two tocblock structures @toc1 and @toc2. 291 * 292 * Return: 'true' Identical 293 * 'false' Different 294 */ 295static bool ldm_compare_tocblocks (const struct tocblock *toc1, 296 const struct tocblock *toc2) 297{ 298 BUG_ON (!toc1 || !toc2); 299 300 return ((toc1->bitmap1_start == toc2->bitmap1_start) && 301 (toc1->bitmap1_size == toc2->bitmap1_size) && 302 (toc1->bitmap2_start == toc2->bitmap2_start) && 303 (toc1->bitmap2_size == toc2->bitmap2_size) && 304 !strncmp (toc1->bitmap1_name, toc2->bitmap1_name, 305 sizeof (toc1->bitmap1_name)) && 306 !strncmp (toc1->bitmap2_name, toc2->bitmap2_name, 307 sizeof (toc1->bitmap2_name))); 308} 309 310/** 311 * ldm_validate_privheads - Compare the primary privhead with its backups 312 * @bdev: Device holding the LDM Database 313 * @ph1: Memory struct to fill with ph contents 314 * 315 * Read and compare all three privheads from disk. 316 * 317 * The privheads on disk show the size and location of the main disk area and 318 * the configuration area (the database). The values are range-checked against 319 * @hd, which contains the real size of the disk. 320 * 321 * Return: 'true' Success 322 * 'false' Error 323 */ 324static bool ldm_validate_privheads (struct block_device *bdev, 325 struct privhead *ph1) 326{ 327 static const int off[3] = { OFF_PRIV1, OFF_PRIV2, OFF_PRIV3 }; 328 struct privhead *ph[3] = { ph1 }; 329 Sector sect; 330 u8 *data; 331 bool result = false; 332 long num_sects; 333 int i; 334 335 BUG_ON (!bdev || !ph1); 336 337 ph[1] = kmalloc (sizeof (*ph[1]), GFP_KERNEL); 338 ph[2] = kmalloc (sizeof (*ph[2]), GFP_KERNEL); 339 if (!ph[1] || !ph[2]) { 340 ldm_crit ("Out of memory."); 341 goto out; 342 } 343 344 /* off[1 & 2] are relative to ph[0]->config_start */ 345 ph[0]->config_start = 0; 346 347 /* Read and parse privheads */ 348 for (i = 0; i < 3; i++) { 349 data = read_dev_sector (bdev, 350 ph[0]->config_start + off[i], §); 351 if (!data) { 352 ldm_crit ("Disk read failed."); 353 goto out; 354 } 355 result = ldm_parse_privhead (data, ph[i]); 356 put_dev_sector (sect); 357 if (!result) { 358 ldm_error ("Cannot find PRIVHEAD %d.", i+1); /* Log again */ 359 if (i < 2) 360 goto out; /* Already logged */ 361 else 362 break; 363 } 364 } 365 366 num_sects = bdev->bd_inode->i_size >> 9; 367 368 if ((ph[0]->config_start > num_sects) || 369 ((ph[0]->config_start + ph[0]->config_size) > num_sects)) { 370 ldm_crit ("Database extends beyond the end of the disk."); 371 goto out; 372 } 373 374 if ((ph[0]->logical_disk_start > ph[0]->config_start) || 375 ((ph[0]->logical_disk_start + ph[0]->logical_disk_size) 376 > ph[0]->config_start)) { 377 ldm_crit ("Disk and database overlap."); 378 goto out; 379 } 380 381 if (!ldm_compare_privheads (ph[0], ph[1])) { 382 ldm_crit ("Primary and backup PRIVHEADs don't match."); 383 goto out; 384 } 385 ldm_debug ("Validated PRIVHEADs successfully."); 386 result = true; 387out: 388 kfree (ph[1]); 389 kfree (ph[2]); 390 return result; 391} 392 393/** 394 * ldm_validate_tocblocks - Validate the table of contents and its backups 395 * @bdev: Device holding the LDM Database 396 * @base: Offset, into @bdev, of the database 397 * @ldb: Cache of the database structures 398 * 399 * Find and compare the four tables of contents of the LDM Database stored on 400 * @bdev and return the parsed information into @toc1. 401 * 402 * The offsets and sizes of the configs are range-checked against a privhead. 403 * 404 * Return: 'true' @toc1 contains validated TOCBLOCK info 405 * 'false' @toc1 contents are undefined 406 */ 407static bool ldm_validate_tocblocks(struct block_device *bdev, 408 unsigned long base, struct ldmdb *ldb) 409{ 410 static const int off[4] = { OFF_TOCB1, OFF_TOCB2, OFF_TOCB3, OFF_TOCB4}; 411 struct tocblock *tb[4]; 412 struct privhead *ph; 413 Sector sect; 414 u8 *data; 415 int i, nr_tbs; 416 bool result = false; 417 418 BUG_ON(!bdev || !ldb); 419 ph = &ldb->ph; 420 tb[0] = &ldb->toc; 421 tb[1] = kmalloc(sizeof(*tb[1]) * 3, GFP_KERNEL); 422 if (!tb[1]) { 423 ldm_crit("Out of memory."); 424 goto err; 425 } 426 tb[2] = (struct tocblock*)((u8*)tb[1] + sizeof(*tb[1])); 427 tb[3] = (struct tocblock*)((u8*)tb[2] + sizeof(*tb[2])); 428 /* 429 * Try to read and parse all four TOCBLOCKs. 430 * 431 * Windows Vista LDM v2.12 does not always have all four TOCBLOCKs so 432 * skip any that fail as long as we get at least one valid TOCBLOCK. 433 */ 434 for (nr_tbs = i = 0; i < 4; i++) { 435 data = read_dev_sector(bdev, base + off[i], §); 436 if (!data) { 437 ldm_error("Disk read failed for TOCBLOCK %d.", i); 438 continue; 439 } 440 if (ldm_parse_tocblock(data, tb[nr_tbs])) 441 nr_tbs++; 442 put_dev_sector(sect); 443 } 444 if (!nr_tbs) { 445 ldm_crit("Failed to find a valid TOCBLOCK."); 446 goto err; 447 } 448 /* Range check the TOCBLOCK against a privhead. */ 449 if (((tb[0]->bitmap1_start + tb[0]->bitmap1_size) > ph->config_size) || 450 ((tb[0]->bitmap2_start + tb[0]->bitmap2_size) > 451 ph->config_size)) { 452 ldm_crit("The bitmaps are out of range. Giving up."); 453 goto err; 454 } 455 /* Compare all loaded TOCBLOCKs. */ 456 for (i = 1; i < nr_tbs; i++) { 457 if (!ldm_compare_tocblocks(tb[0], tb[i])) { 458 ldm_crit("TOCBLOCKs 0 and %d do not match.", i); 459 goto err; 460 } 461 } 462 ldm_debug("Validated %d TOCBLOCKs successfully.", nr_tbs); 463 result = true; 464err: 465 kfree(tb[1]); 466 return result; 467} 468 469/** 470 * ldm_validate_vmdb - Read the VMDB and validate it 471 * @bdev: Device holding the LDM Database 472 * @base: Offset, into @bdev, of the database 473 * @ldb: Cache of the database structures 474 * 475 * Find the vmdb of the LDM Database stored on @bdev and return the parsed 476 * information in @ldb. 477 * 478 * Return: 'true' @ldb contains validated VBDB info 479 * 'false' @ldb contents are undefined 480 */ 481static bool ldm_validate_vmdb (struct block_device *bdev, unsigned long base, 482 struct ldmdb *ldb) 483{ 484 Sector sect; 485 u8 *data; 486 bool result = false; 487 struct vmdb *vm; 488 struct tocblock *toc; 489 490 BUG_ON (!bdev || !ldb); 491 492 vm = &ldb->vm; 493 toc = &ldb->toc; 494 495 data = read_dev_sector (bdev, base + OFF_VMDB, §); 496 if (!data) { 497 ldm_crit ("Disk read failed."); 498 return false; 499 } 500 501 if (!ldm_parse_vmdb (data, vm)) 502 goto out; /* Already logged */ 503 504 /* Are there uncommitted transactions? */ 505 if (BE16(data + 0x10) != 0x01) { 506 ldm_crit ("Database is not in a consistent state. Aborting."); 507 goto out; 508 } 509 510 if (vm->vblk_offset != 512) 511 ldm_info ("VBLKs start at offset 0x%04x.", vm->vblk_offset); 512 513 /* 514 * The last_vblkd_seq can be before the end of the vmdb, just make sure 515 * it is not out of bounds. 516 */ 517 if ((vm->vblk_size * vm->last_vblk_seq) > (toc->bitmap1_size << 9)) { 518 ldm_crit ("VMDB exceeds allowed size specified by TOCBLOCK. " 519 "Database is corrupt. Aborting."); 520 goto out; 521 } 522 523 result = true; 524out: 525 put_dev_sector (sect); 526 return result; 527} 528 529 530/** 531 * ldm_validate_partition_table - Determine whether bdev might be a dynamic disk 532 * @bdev: Device holding the LDM Database 533 * 534 * This function provides a weak test to decide whether the device is a dynamic 535 * disk or not. It looks for an MS-DOS-style partition table containing at 536 * least one partition of type 0x42 (formerly SFS, now used by Windows for 537 * dynamic disks). 538 * 539 * N.B. The only possible error can come from the read_dev_sector and that is 540 * only likely to happen if the underlying device is strange. If that IS 541 * the case we should return zero to let someone else try. 542 * 543 * Return: 'true' @bdev is a dynamic disk 544 * 'false' @bdev is not a dynamic disk, or an error occurred 545 */ 546static bool ldm_validate_partition_table (struct block_device *bdev) 547{ 548 Sector sect; 549 u8 *data; 550 struct partition *p; 551 int i; 552 bool result = false; 553 554 BUG_ON (!bdev); 555 556 data = read_dev_sector (bdev, 0, §); 557 if (!data) { 558 ldm_crit ("Disk read failed."); 559 return false; 560 } 561 562 if (*(__le16*) (data + 0x01FE) != cpu_to_le16 (MSDOS_LABEL_MAGIC)) 563 goto out; 564 565 p = (struct partition*)(data + 0x01BE); 566 for (i = 0; i < 4; i++, p++) 567 if (SYS_IND (p) == LDM_PARTITION) { 568 result = true; 569 break; 570 } 571 572 if (result) 573 ldm_debug ("Found W2K dynamic disk partition type."); 574 575out: 576 put_dev_sector (sect); 577 return result; 578} 579 580/** 581 * ldm_get_disk_objid - Search a linked list of vblk's for a given Disk Id 582 * @ldb: Cache of the database structures 583 * 584 * The LDM Database contains a list of all partitions on all dynamic disks. 585 * The primary PRIVHEAD, at the beginning of the physical disk, tells us 586 * the GUID of this disk. This function searches for the GUID in a linked 587 * list of vblk's. 588 * 589 * Return: Pointer, A matching vblk was found 590 * NULL, No match, or an error 591 */ 592static struct vblk * ldm_get_disk_objid (const struct ldmdb *ldb) 593{ 594 struct list_head *item; 595 596 BUG_ON (!ldb); 597 598 list_for_each (item, &ldb->v_disk) { 599 struct vblk *v = list_entry (item, struct vblk, list); 600 if (!memcmp (v->vblk.disk.disk_id, ldb->ph.disk_id, GUID_SIZE)) 601 return v; 602 } 603 604 return NULL; 605} 606 607/** 608 * ldm_create_data_partitions - Create data partitions for this device 609 * @pp: List of the partitions parsed so far 610 * @ldb: Cache of the database structures 611 * 612 * The database contains ALL the partitions for ALL disk groups, so we need to 613 * filter out this specific disk. Using the disk's object id, we can find all 614 * the partitions in the database that belong to this disk. 615 * 616 * Add each partition in our database, to the parsed_partitions structure. 617 * 618 * N.B. This function creates the partitions in the order it finds partition 619 * objects in the linked list. 620 * 621 * Return: 'true' Partition created 622 * 'false' Error, probably a range checking problem 623 */ 624static bool ldm_create_data_partitions (struct parsed_partitions *pp, 625 const struct ldmdb *ldb) 626{ 627 struct list_head *item; 628 struct vblk *vb; 629 struct vblk *disk; 630 struct vblk_part *part; 631 int part_num = 1; 632 633 BUG_ON (!pp || !ldb); 634 635 disk = ldm_get_disk_objid (ldb); 636 if (!disk) { 637 ldm_crit ("Can't find the ID of this disk in the database."); 638 return false; 639 } 640 641 printk (" [LDM]"); 642 643 /* Create the data partitions */ 644 list_for_each (item, &ldb->v_part) { 645 vb = list_entry (item, struct vblk, list); 646 part = &vb->vblk.part; 647 648 if (part->disk_id != disk->obj_id) 649 continue; 650 651 put_partition (pp, part_num, ldb->ph.logical_disk_start + 652 part->start, part->size); 653 part_num++; 654 } 655 656 printk ("\n"); 657 return true; 658} 659 660 661/** 662 * ldm_relative - Calculate the next relative offset 663 * @buffer: Block of data being worked on 664 * @buflen: Size of the block of data 665 * @base: Size of the previous fixed width fields 666 * @offset: Cumulative size of the previous variable-width fields 667 * 668 * Because many of the VBLK fields are variable-width, it's necessary 669 * to calculate each offset based on the previous one and the length 670 * of the field it pointed to. 671 * 672 * Return: -1 Error, the calculated offset exceeded the size of the buffer 673 * n OK, a range-checked offset into buffer 674 */ 675static int ldm_relative (const u8 *buffer, int buflen, int base, int offset) 676{ 677 678 base += offset; 679 if ((!buffer) || (offset < 0) || (base > buflen)) 680 return -1; 681 if ((base + buffer[base]) >= buflen) 682 return -1; 683 684 return buffer[base] + offset + 1; 685} 686 687/** 688 * ldm_get_vnum - Convert a variable-width, big endian number, into cpu order 689 * @block: Pointer to the variable-width number to convert 690 * 691 * Large numbers in the LDM Database are often stored in a packed format. Each 692 * number is prefixed by a one byte width marker. All numbers in the database 693 * are stored in big-endian byte order. This function reads one of these 694 * numbers and returns the result 695 * 696 * N.B. This function DOES NOT perform any range checking, though the most 697 * it will read is eight bytes. 698 * 699 * Return: n A number 700 * 0 Zero, or an error occurred 701 */ 702static u64 ldm_get_vnum (const u8 *block) 703{ 704 u64 tmp = 0; 705 u8 length; 706 707 BUG_ON (!block); 708 709 length = *block++; 710 711 if (length && length <= 8) 712 while (length--) 713 tmp = (tmp << 8) | *block++; 714 else 715 ldm_error ("Illegal length %d.", length); 716 717 return tmp; 718} 719 720/** 721 * ldm_get_vstr - Read a length-prefixed string into a buffer 722 * @block: Pointer to the length marker 723 * @buffer: Location to copy string to 724 * @buflen: Size of the output buffer 725 * 726 * Many of the strings in the LDM Database are not NULL terminated. Instead 727 * they are prefixed by a one byte length marker. This function copies one of 728 * these strings into a buffer. 729 * 730 * N.B. This function DOES NOT perform any range checking on the input. 731 * If the buffer is too small, the output will be truncated. 732 * 733 * Return: 0, Error and @buffer contents are undefined 734 * n, String length in characters (excluding NULL) 735 * buflen-1, String was truncated. 736 */ 737static int ldm_get_vstr (const u8 *block, u8 *buffer, int buflen) 738{ 739 int length; 740 741 BUG_ON (!block || !buffer); 742 743 length = block[0]; 744 if (length >= buflen) { 745 ldm_error ("Truncating string %d -> %d.", length, buflen); 746 length = buflen - 1; 747 } 748 memcpy (buffer, block + 1, length); 749 buffer[length] = 0; 750 return length; 751} 752 753 754/** 755 * ldm_parse_cmp3 - Read a raw VBLK Component object into a vblk structure 756 * @buffer: Block of data being worked on 757 * @buflen: Size of the block of data 758 * @vb: In-memory vblk in which to return information 759 * 760 * Read a raw VBLK Component object (version 3) into a vblk structure. 761 * 762 * Return: 'true' @vb contains a Component VBLK 763 * 'false' @vb contents are not defined 764 */ 765static bool ldm_parse_cmp3 (const u8 *buffer, int buflen, struct vblk *vb) 766{ 767 int r_objid, r_name, r_vstate, r_child, r_parent, r_stripe, r_cols, len; 768 struct vblk_comp *comp; 769 770 BUG_ON (!buffer || !vb); 771 772 r_objid = ldm_relative (buffer, buflen, 0x18, 0); 773 r_name = ldm_relative (buffer, buflen, 0x18, r_objid); 774 r_vstate = ldm_relative (buffer, buflen, 0x18, r_name); 775 r_child = ldm_relative (buffer, buflen, 0x1D, r_vstate); 776 r_parent = ldm_relative (buffer, buflen, 0x2D, r_child); 777 778 if (buffer[0x12] & VBLK_FLAG_COMP_STRIPE) { 779 r_stripe = ldm_relative (buffer, buflen, 0x2E, r_parent); 780 r_cols = ldm_relative (buffer, buflen, 0x2E, r_stripe); 781 len = r_cols; 782 } else { 783 r_stripe = 0; 784 r_cols = 0; 785 len = r_parent; 786 } 787 if (len < 0) 788 return false; 789 790 len += VBLK_SIZE_CMP3; 791 if (len != BE32 (buffer + 0x14)) 792 return false; 793 794 comp = &vb->vblk.comp; 795 ldm_get_vstr (buffer + 0x18 + r_name, comp->state, 796 sizeof (comp->state)); 797 comp->type = buffer[0x18 + r_vstate]; 798 comp->children = ldm_get_vnum (buffer + 0x1D + r_vstate); 799 comp->parent_id = ldm_get_vnum (buffer + 0x2D + r_child); 800 comp->chunksize = r_stripe ? ldm_get_vnum (buffer+r_parent+0x2E) : 0; 801 802 return true; 803} 804 805/** 806 * ldm_parse_dgr3 - Read a raw VBLK Disk Group object into a vblk structure 807 * @buffer: Block of data being worked on 808 * @buflen: Size of the block of data 809 * @vb: In-memory vblk in which to return information 810 * 811 * Read a raw VBLK Disk Group object (version 3) into a vblk structure. 812 * 813 * Return: 'true' @vb contains a Disk Group VBLK 814 * 'false' @vb contents are not defined 815 */ 816static int ldm_parse_dgr3 (const u8 *buffer, int buflen, struct vblk *vb) 817{ 818 int r_objid, r_name, r_diskid, r_id1, r_id2, len; 819 struct vblk_dgrp *dgrp; 820 821 BUG_ON (!buffer || !vb); 822 823 r_objid = ldm_relative (buffer, buflen, 0x18, 0); 824 r_name = ldm_relative (buffer, buflen, 0x18, r_objid); 825 r_diskid = ldm_relative (buffer, buflen, 0x18, r_name); 826 827 if (buffer[0x12] & VBLK_FLAG_DGR3_IDS) { 828 r_id1 = ldm_relative (buffer, buflen, 0x24, r_diskid); 829 r_id2 = ldm_relative (buffer, buflen, 0x24, r_id1); 830 len = r_id2; 831 } else { 832 r_id1 = 0; 833 r_id2 = 0; 834 len = r_diskid; 835 } 836 if (len < 0) 837 return false; 838 839 len += VBLK_SIZE_DGR3; 840 if (len != BE32 (buffer + 0x14)) 841 return false; 842 843 dgrp = &vb->vblk.dgrp; 844 ldm_get_vstr (buffer + 0x18 + r_name, dgrp->disk_id, 845 sizeof (dgrp->disk_id)); 846 return true; 847} 848 849/** 850 * ldm_parse_dgr4 - Read a raw VBLK Disk Group object into a vblk structure 851 * @buffer: Block of data being worked on 852 * @buflen: Size of the block of data 853 * @vb: In-memory vblk in which to return information 854 * 855 * Read a raw VBLK Disk Group object (version 4) into a vblk structure. 856 * 857 * Return: 'true' @vb contains a Disk Group VBLK 858 * 'false' @vb contents are not defined 859 */ 860static bool ldm_parse_dgr4 (const u8 *buffer, int buflen, struct vblk *vb) 861{ 862 char buf[64]; 863 int r_objid, r_name, r_id1, r_id2, len; 864 struct vblk_dgrp *dgrp; 865 866 BUG_ON (!buffer || !vb); 867 868 r_objid = ldm_relative (buffer, buflen, 0x18, 0); 869 r_name = ldm_relative (buffer, buflen, 0x18, r_objid); 870 871 if (buffer[0x12] & VBLK_FLAG_DGR4_IDS) { 872 r_id1 = ldm_relative (buffer, buflen, 0x44, r_name); 873 r_id2 = ldm_relative (buffer, buflen, 0x44, r_id1); 874 len = r_id2; 875 } else { 876 r_id1 = 0; 877 r_id2 = 0; 878 len = r_name; 879 } 880 if (len < 0) 881 return false; 882 883 len += VBLK_SIZE_DGR4; 884 if (len != BE32 (buffer + 0x14)) 885 return false; 886 887 dgrp = &vb->vblk.dgrp; 888 889 ldm_get_vstr (buffer + 0x18 + r_objid, buf, sizeof (buf)); 890 return true; 891} 892 893/** 894 * ldm_parse_dsk3 - Read a raw VBLK Disk object into a vblk structure 895 * @buffer: Block of data being worked on 896 * @buflen: Size of the block of data 897 * @vb: In-memory vblk in which to return information 898 * 899 * Read a raw VBLK Disk object (version 3) into a vblk structure. 900 * 901 * Return: 'true' @vb contains a Disk VBLK 902 * 'false' @vb contents are not defined 903 */ 904static bool ldm_parse_dsk3 (const u8 *buffer, int buflen, struct vblk *vb) 905{ 906 int r_objid, r_name, r_diskid, r_altname, len; 907 struct vblk_disk *disk; 908 909 BUG_ON (!buffer || !vb); 910 911 r_objid = ldm_relative (buffer, buflen, 0x18, 0); 912 r_name = ldm_relative (buffer, buflen, 0x18, r_objid); 913 r_diskid = ldm_relative (buffer, buflen, 0x18, r_name); 914 r_altname = ldm_relative (buffer, buflen, 0x18, r_diskid); 915 len = r_altname; 916 if (len < 0) 917 return false; 918 919 len += VBLK_SIZE_DSK3; 920 if (len != BE32 (buffer + 0x14)) 921 return false; 922 923 disk = &vb->vblk.disk; 924 ldm_get_vstr (buffer + 0x18 + r_diskid, disk->alt_name, 925 sizeof (disk->alt_name)); 926 if (!ldm_parse_guid (buffer + 0x19 + r_name, disk->disk_id)) 927 return false; 928 929 return true; 930} 931 932/** 933 * ldm_parse_dsk4 - Read a raw VBLK Disk object into a vblk structure 934 * @buffer: Block of data being worked on 935 * @buflen: Size of the block of data 936 * @vb: In-memory vblk in which to return information 937 * 938 * Read a raw VBLK Disk object (version 4) into a vblk structure. 939 * 940 * Return: 'true' @vb contains a Disk VBLK 941 * 'false' @vb contents are not defined 942 */ 943static bool ldm_parse_dsk4 (const u8 *buffer, int buflen, struct vblk *vb) 944{ 945 int r_objid, r_name, len; 946 struct vblk_disk *disk; 947 948 BUG_ON (!buffer || !vb); 949 950 r_objid = ldm_relative (buffer, buflen, 0x18, 0); 951 r_name = ldm_relative (buffer, buflen, 0x18, r_objid); 952 len = r_name; 953 if (len < 0) 954 return false; 955 956 len += VBLK_SIZE_DSK4; 957 if (len != BE32 (buffer + 0x14)) 958 return false; 959 960 disk = &vb->vblk.disk; 961 memcpy (disk->disk_id, buffer + 0x18 + r_name, GUID_SIZE); 962 return true; 963} 964 965/** 966 * ldm_parse_prt3 - Read a raw VBLK Partition object into a vblk structure 967 * @buffer: Block of data being worked on 968 * @buflen: Size of the block of data 969 * @vb: In-memory vblk in which to return information 970 * 971 * Read a raw VBLK Partition object (version 3) into a vblk structure. 972 * 973 * Return: 'true' @vb contains a Partition VBLK 974 * 'false' @vb contents are not defined 975 */ 976static bool ldm_parse_prt3(const u8 *buffer, int buflen, struct vblk *vb) 977{ 978 int r_objid, r_name, r_size, r_parent, r_diskid, r_index, len; 979 struct vblk_part *part; 980 981 BUG_ON(!buffer || !vb); 982 r_objid = ldm_relative(buffer, buflen, 0x18, 0); 983 if (r_objid < 0) { 984 ldm_error("r_objid %d < 0", r_objid); 985 return false; 986 } 987 r_name = ldm_relative(buffer, buflen, 0x18, r_objid); 988 if (r_name < 0) { 989 ldm_error("r_name %d < 0", r_name); 990 return false; 991 } 992 r_size = ldm_relative(buffer, buflen, 0x34, r_name); 993 if (r_size < 0) { 994 ldm_error("r_size %d < 0", r_size); 995 return false; 996 } 997 r_parent = ldm_relative(buffer, buflen, 0x34, r_size); 998 if (r_parent < 0) { 999 ldm_error("r_parent %d < 0", r_parent); 1000 return false; 1001 } 1002 r_diskid = ldm_relative(buffer, buflen, 0x34, r_parent); 1003 if (r_diskid < 0) { 1004 ldm_error("r_diskid %d < 0", r_diskid); 1005 return false; 1006 } 1007 if (buffer[0x12] & VBLK_FLAG_PART_INDEX) { 1008 r_index = ldm_relative(buffer, buflen, 0x34, r_diskid); 1009 if (r_index < 0) { 1010 ldm_error("r_index %d < 0", r_index); 1011 return false; 1012 } 1013 len = r_index; 1014 } else { 1015 r_index = 0; 1016 len = r_diskid; 1017 } 1018 if (len < 0) { 1019 ldm_error("len %d < 0", len); 1020 return false; 1021 } 1022 len += VBLK_SIZE_PRT3; 1023 if (len > BE32(buffer + 0x14)) { 1024 ldm_error("len %d > BE32(buffer + 0x14) %d", len, 1025 BE32(buffer + 0x14)); 1026 return false; 1027 } 1028 part = &vb->vblk.part; 1029 part->start = BE64(buffer + 0x24 + r_name); 1030 part->volume_offset = BE64(buffer + 0x2C + r_name); 1031 part->size = ldm_get_vnum(buffer + 0x34 + r_name); 1032 part->parent_id = ldm_get_vnum(buffer + 0x34 + r_size); 1033 part->disk_id = ldm_get_vnum(buffer + 0x34 + r_parent); 1034 if (vb->flags & VBLK_FLAG_PART_INDEX) 1035 part->partnum = buffer[0x35 + r_diskid]; 1036 else 1037 part->partnum = 0; 1038 return true; 1039} 1040 1041/** 1042 * ldm_parse_vol5 - Read a raw VBLK Volume object into a vblk structure 1043 * @buffer: Block of data being worked on 1044 * @buflen: Size of the block of data 1045 * @vb: In-memory vblk in which to return information 1046 * 1047 * Read a raw VBLK Volume object (version 5) into a vblk structure. 1048 * 1049 * Return: 'true' @vb contains a Volume VBLK 1050 * 'false' @vb contents are not defined 1051 */ 1052static bool ldm_parse_vol5 (const u8 *buffer, int buflen, struct vblk *vb) 1053{ 1054 int r_objid, r_name, r_vtype, r_child, r_size, r_id1, r_id2, r_size2; 1055 int r_drive, len; 1056 struct vblk_volu *volu; 1057 1058 BUG_ON (!buffer || !vb); 1059 1060 r_objid = ldm_relative (buffer, buflen, 0x18, 0); 1061 r_name = ldm_relative (buffer, buflen, 0x18, r_objid); 1062 r_vtype = ldm_relative (buffer, buflen, 0x18, r_name); 1063 r_child = ldm_relative (buffer, buflen, 0x2E, r_vtype); 1064 r_size = ldm_relative (buffer, buflen, 0x3E, r_child); 1065 1066 if (buffer[0x12] & VBLK_FLAG_VOLU_ID1) 1067 r_id1 = ldm_relative (buffer, buflen, 0x53, r_size); 1068 else 1069 r_id1 = r_size; 1070 1071 if (buffer[0x12] & VBLK_FLAG_VOLU_ID2) 1072 r_id2 = ldm_relative (buffer, buflen, 0x53, r_id1); 1073 else 1074 r_id2 = r_id1; 1075 1076 if (buffer[0x12] & VBLK_FLAG_VOLU_SIZE) 1077 r_size2 = ldm_relative (buffer, buflen, 0x53, r_id2); 1078 else 1079 r_size2 = r_id2; 1080 1081 if (buffer[0x12] & VBLK_FLAG_VOLU_DRIVE) 1082 r_drive = ldm_relative (buffer, buflen, 0x53, r_size2); 1083 else 1084 r_drive = r_size2; 1085 1086 len = r_drive; 1087 if (len < 0) 1088 return false; 1089 1090 len += VBLK_SIZE_VOL5; 1091 if (len != BE32 (buffer + 0x14)) 1092 return false; 1093 1094 volu = &vb->vblk.volu; 1095 1096 ldm_get_vstr (buffer + 0x18 + r_name, volu->volume_type, 1097 sizeof (volu->volume_type)); 1098 memcpy (volu->volume_state, buffer + 0x19 + r_vtype, 1099 sizeof (volu->volume_state)); 1100 volu->size = ldm_get_vnum (buffer + 0x3E + r_child); 1101 volu->partition_type = buffer[0x42 + r_size]; 1102 memcpy (volu->guid, buffer + 0x43 + r_size, sizeof (volu->guid)); 1103 if (buffer[0x12] & VBLK_FLAG_VOLU_DRIVE) { 1104 ldm_get_vstr (buffer + 0x53 + r_size, volu->drive_hint, 1105 sizeof (volu->drive_hint)); 1106 } 1107 return true; 1108} 1109 1110/** 1111 * ldm_parse_vblk - Read a raw VBLK object into a vblk structure 1112 * @buf: Block of data being worked on 1113 * @len: Size of the block of data 1114 * @vb: In-memory vblk in which to return information 1115 * 1116 * Read a raw VBLK object into a vblk structure. This function just reads the 1117 * information common to all VBLK types, then delegates the rest of the work to 1118 * helper functions: ldm_parse_*. 1119 * 1120 * Return: 'true' @vb contains a VBLK 1121 * 'false' @vb contents are not defined 1122 */ 1123static bool ldm_parse_vblk (const u8 *buf, int len, struct vblk *vb) 1124{ 1125 bool result = false; 1126 int r_objid; 1127 1128 BUG_ON (!buf || !vb); 1129 1130 r_objid = ldm_relative (buf, len, 0x18, 0); 1131 if (r_objid < 0) { 1132 ldm_error ("VBLK header is corrupt."); 1133 return false; 1134 } 1135 1136 vb->flags = buf[0x12]; 1137 vb->type = buf[0x13]; 1138 vb->obj_id = ldm_get_vnum (buf + 0x18); 1139 ldm_get_vstr (buf+0x18+r_objid, vb->name, sizeof (vb->name)); 1140 1141 switch (vb->type) { 1142 case VBLK_CMP3: result = ldm_parse_cmp3 (buf, len, vb); break; 1143 case VBLK_DSK3: result = ldm_parse_dsk3 (buf, len, vb); break; 1144 case VBLK_DSK4: result = ldm_parse_dsk4 (buf, len, vb); break; 1145 case VBLK_DGR3: result = ldm_parse_dgr3 (buf, len, vb); break; 1146 case VBLK_DGR4: result = ldm_parse_dgr4 (buf, len, vb); break; 1147 case VBLK_PRT3: result = ldm_parse_prt3 (buf, len, vb); break; 1148 case VBLK_VOL5: result = ldm_parse_vol5 (buf, len, vb); break; 1149 } 1150 1151 if (result) 1152 ldm_debug ("Parsed VBLK 0x%llx (type: 0x%02x) ok.", 1153 (unsigned long long) vb->obj_id, vb->type); 1154 else 1155 ldm_error ("Failed to parse VBLK 0x%llx (type: 0x%02x).", 1156 (unsigned long long) vb->obj_id, vb->type); 1157 1158 return result; 1159} 1160 1161 1162/** 1163 * ldm_ldmdb_add - Adds a raw VBLK entry to the ldmdb database 1164 * @data: Raw VBLK to add to the database 1165 * @len: Size of the raw VBLK 1166 * @ldb: Cache of the database structures 1167 * 1168 * The VBLKs are sorted into categories. Partitions are also sorted by offset. 1169 * 1170 * N.B. This function does not check the validity of the VBLKs. 1171 * 1172 * Return: 'true' The VBLK was added 1173 * 'false' An error occurred 1174 */ 1175static bool ldm_ldmdb_add (u8 *data, int len, struct ldmdb *ldb) 1176{ 1177 struct vblk *vb; 1178 struct list_head *item; 1179 1180 BUG_ON (!data || !ldb); 1181 1182 vb = kmalloc (sizeof (*vb), GFP_KERNEL); 1183 if (!vb) { 1184 ldm_crit ("Out of memory."); 1185 return false; 1186 } 1187 1188 if (!ldm_parse_vblk (data, len, vb)) { 1189 kfree(vb); 1190 return false; /* Already logged */ 1191 } 1192 1193 /* Put vblk into the correct list. */ 1194 switch (vb->type) { 1195 case VBLK_DGR3: 1196 case VBLK_DGR4: 1197 list_add (&vb->list, &ldb->v_dgrp); 1198 break; 1199 case VBLK_DSK3: 1200 case VBLK_DSK4: 1201 list_add (&vb->list, &ldb->v_disk); 1202 break; 1203 case VBLK_VOL5: 1204 list_add (&vb->list, &ldb->v_volu); 1205 break; 1206 case VBLK_CMP3: 1207 list_add (&vb->list, &ldb->v_comp); 1208 break; 1209 case VBLK_PRT3: 1210 /* Sort by the partition's start sector. */ 1211 list_for_each (item, &ldb->v_part) { 1212 struct vblk *v = list_entry (item, struct vblk, list); 1213 if ((v->vblk.part.disk_id == vb->vblk.part.disk_id) && 1214 (v->vblk.part.start > vb->vblk.part.start)) { 1215 list_add_tail (&vb->list, &v->list); 1216 return true; 1217 } 1218 } 1219 list_add_tail (&vb->list, &ldb->v_part); 1220 break; 1221 } 1222 return true; 1223} 1224 1225/** 1226 * ldm_frag_add - Add a VBLK fragment to a list 1227 * @data: Raw fragment to be added to the list 1228 * @size: Size of the raw fragment 1229 * @frags: Linked list of VBLK fragments 1230 * 1231 * Fragmented VBLKs may not be consecutive in the database, so they are placed 1232 * in a list so they can be pieced together later. 1233 * 1234 * Return: 'true' Success, the VBLK was added to the list 1235 * 'false' Error, a problem occurred 1236 */ 1237static bool ldm_frag_add (const u8 *data, int size, struct list_head *frags) 1238{ 1239 struct frag *f; 1240 struct list_head *item; 1241 int rec, num, group; 1242 1243 BUG_ON (!data || !frags); 1244 1245 group = BE32 (data + 0x08); 1246 rec = BE16 (data + 0x0C); 1247 num = BE16 (data + 0x0E); 1248 if ((num < 1) || (num > 4)) { 1249 ldm_error ("A VBLK claims to have %d parts.", num); 1250 return false; 1251 } 1252 1253 list_for_each (item, frags) { 1254 f = list_entry (item, struct frag, list); 1255 if (f->group == group) 1256 goto found; 1257 } 1258 1259 f = kmalloc (sizeof (*f) + size*num, GFP_KERNEL); 1260 if (!f) { 1261 ldm_crit ("Out of memory."); 1262 return false; 1263 } 1264 1265 f->group = group; 1266 f->num = num; 1267 f->rec = rec; 1268 f->map = 0xFF << num; 1269 1270 list_add_tail (&f->list, frags); 1271found: 1272 if (f->map & (1 << rec)) { 1273 ldm_error ("Duplicate VBLK, part %d.", rec); 1274 f->map &= 0x7F; /* Mark the group as broken */ 1275 return false; 1276 } 1277 1278 f->map |= (1 << rec); 1279 1280 if (num > 0) { 1281 data += VBLK_SIZE_HEAD; 1282 size -= VBLK_SIZE_HEAD; 1283 } 1284 memcpy (f->data+rec*(size-VBLK_SIZE_HEAD)+VBLK_SIZE_HEAD, data, size); 1285 1286 return true; 1287} 1288 1289/** 1290 * ldm_frag_free - Free a linked list of VBLK fragments 1291 * @list: Linked list of fragments 1292 * 1293 * Free a linked list of VBLK fragments 1294 * 1295 * Return: none 1296 */ 1297static void ldm_frag_free (struct list_head *list) 1298{ 1299 struct list_head *item, *tmp; 1300 1301 BUG_ON (!list); 1302 1303 list_for_each_safe (item, tmp, list) 1304 kfree (list_entry (item, struct frag, list)); 1305} 1306 1307/** 1308 * ldm_frag_commit - Validate fragmented VBLKs and add them to the database 1309 * @frags: Linked list of VBLK fragments 1310 * @ldb: Cache of the database structures 1311 * 1312 * Now that all the fragmented VBLKs have been collected, they must be added to 1313 * the database for later use. 1314 * 1315 * Return: 'true' All the fragments we added successfully 1316 * 'false' One or more of the fragments we invalid 1317 */ 1318static bool ldm_frag_commit (struct list_head *frags, struct ldmdb *ldb) 1319{ 1320 struct frag *f; 1321 struct list_head *item; 1322 1323 BUG_ON (!frags || !ldb); 1324 1325 list_for_each (item, frags) { 1326 f = list_entry (item, struct frag, list); 1327 1328 if (f->map != 0xFF) { 1329 ldm_error ("VBLK group %d is incomplete (0x%02x).", 1330 f->group, f->map); 1331 return false; 1332 } 1333 1334 if (!ldm_ldmdb_add (f->data, f->num*ldb->vm.vblk_size, ldb)) 1335 return false; /* Already logged */ 1336 } 1337 return true; 1338} 1339 1340/** 1341 * ldm_get_vblks - Read the on-disk database of VBLKs into memory 1342 * @bdev: Device holding the LDM Database 1343 * @base: Offset, into @bdev, of the database 1344 * @ldb: Cache of the database structures 1345 * 1346 * To use the information from the VBLKs, they need to be read from the disk, 1347 * unpacked and validated. We cache them in @ldb according to their type. 1348 * 1349 * Return: 'true' All the VBLKs were read successfully 1350 * 'false' An error occurred 1351 */ 1352static bool ldm_get_vblks (struct block_device *bdev, unsigned long base, 1353 struct ldmdb *ldb) 1354{ 1355 int size, perbuf, skip, finish, s, v, recs; 1356 u8 *data = NULL; 1357 Sector sect; 1358 bool result = false; 1359 LIST_HEAD (frags); 1360 1361 BUG_ON (!bdev || !ldb); 1362 1363 size = ldb->vm.vblk_size; 1364 perbuf = 512 / size; 1365 skip = ldb->vm.vblk_offset >> 9; /* Bytes to sectors */ 1366 finish = (size * ldb->vm.last_vblk_seq) >> 9; 1367 1368 for (s = skip; s < finish; s++) { /* For each sector */ 1369 data = read_dev_sector (bdev, base + OFF_VMDB + s, §); 1370 if (!data) { 1371 ldm_crit ("Disk read failed."); 1372 goto out; 1373 } 1374 1375 for (v = 0; v < perbuf; v++, data+=size) { /* For each vblk */ 1376 if (MAGIC_VBLK != BE32 (data)) { 1377 ldm_error ("Expected to find a VBLK."); 1378 goto out; 1379 } 1380 1381 recs = BE16 (data + 0x0E); /* Number of records */ 1382 if (recs == 1) { 1383 if (!ldm_ldmdb_add (data, size, ldb)) 1384 goto out; /* Already logged */ 1385 } else if (recs > 1) { 1386 if (!ldm_frag_add (data, size, &frags)) 1387 goto out; /* Already logged */ 1388 } 1389 /* else Record is not in use, ignore it. */ 1390 } 1391 put_dev_sector (sect); 1392 data = NULL; 1393 } 1394 1395 result = ldm_frag_commit (&frags, ldb); /* Failures, already logged */ 1396out: 1397 if (data) 1398 put_dev_sector (sect); 1399 ldm_frag_free (&frags); 1400 1401 return result; 1402} 1403 1404/** 1405 * ldm_free_vblks - Free a linked list of vblk's 1406 * @lh: Head of a linked list of struct vblk 1407 * 1408 * Free a list of vblk's and free the memory used to maintain the list. 1409 * 1410 * Return: none 1411 */ 1412static void ldm_free_vblks (struct list_head *lh) 1413{ 1414 struct list_head *item, *tmp; 1415 1416 BUG_ON (!lh); 1417 1418 list_for_each_safe (item, tmp, lh) 1419 kfree (list_entry (item, struct vblk, list)); 1420} 1421 1422 1423/** 1424 * ldm_partition - Find out whether a device is a dynamic disk and handle it 1425 * @pp: List of the partitions parsed so far 1426 * @bdev: Device holding the LDM Database 1427 * 1428 * This determines whether the device @bdev is a dynamic disk and if so creates 1429 * the partitions necessary in the gendisk structure pointed to by @hd. 1430 * 1431 * We create a dummy device 1, which contains the LDM database, and then create 1432 * each partition described by the LDM database in sequence as devices 2+. For 1433 * example, if the device is hda, we would have: hda1: LDM database, hda2, hda3, 1434 * and so on: the actual data containing partitions. 1435 * 1436 * Return: 1 Success, @bdev is a dynamic disk and we handled it 1437 * 0 Success, @bdev is not a dynamic disk 1438 * -1 An error occurred before enough information had been read 1439 * Or @bdev is a dynamic disk, but it may be corrupted 1440 */ 1441int ldm_partition (struct parsed_partitions *pp, struct block_device *bdev) 1442{ 1443 struct ldmdb *ldb; 1444 unsigned long base; 1445 int result = -1; 1446 1447 BUG_ON (!pp || !bdev); 1448 1449 /* Look for signs of a Dynamic Disk */ 1450 if (!ldm_validate_partition_table (bdev)) 1451 return 0; 1452 1453 ldb = kmalloc (sizeof (*ldb), GFP_KERNEL); 1454 if (!ldb) { 1455 ldm_crit ("Out of memory."); 1456 goto out; 1457 } 1458 1459 /* Parse and check privheads. */ 1460 if (!ldm_validate_privheads (bdev, &ldb->ph)) 1461 goto out; /* Already logged */ 1462 1463 /* All further references are relative to base (database start). */ 1464 base = ldb->ph.config_start; 1465 1466 /* Parse and check tocs and vmdb. */ 1467 if (!ldm_validate_tocblocks (bdev, base, ldb) || 1468 !ldm_validate_vmdb (bdev, base, ldb)) 1469 goto out; /* Already logged */ 1470 1471 /* Initialize vblk lists in ldmdb struct */ 1472 INIT_LIST_HEAD (&ldb->v_dgrp); 1473 INIT_LIST_HEAD (&ldb->v_disk); 1474 INIT_LIST_HEAD (&ldb->v_volu); 1475 INIT_LIST_HEAD (&ldb->v_comp); 1476 INIT_LIST_HEAD (&ldb->v_part); 1477 1478 if (!ldm_get_vblks (bdev, base, ldb)) { 1479 ldm_crit ("Failed to read the VBLKs from the database."); 1480 goto cleanup; 1481 } 1482 1483 /* Finally, create the data partition devices. */ 1484 if (ldm_create_data_partitions (pp, ldb)) { 1485 ldm_debug ("Parsed LDM database successfully."); 1486 result = 1; 1487 } 1488 /* else Already logged */ 1489 1490cleanup: 1491 ldm_free_vblks (&ldb->v_dgrp); 1492 ldm_free_vblks (&ldb->v_disk); 1493 ldm_free_vblks (&ldb->v_volu); 1494 ldm_free_vblks (&ldb->v_comp); 1495 ldm_free_vblks (&ldb->v_part); 1496out: 1497 kfree (ldb); 1498 return result; 1499} 1500