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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * ldm - Support for Windows Logical Disk Manager (Dynamic Disks)4 *5 * Copyright (C) 2001,2002 Richard Russon <ldm@flatcap.org>6 * Copyright (c) 2001-2012 Anton Altaparmakov7 * Copyright (C) 2001,2002 Jakob Kemi <jakob.kemi@telia.com>8 *9 * Documentation is available at http://www.linux-ntfs.org/doku.php?id=downloads 10 */11 12#include <linux/slab.h>13#include <linux/pagemap.h>14#include <linux/stringify.h>15#include <linux/kernel.h>16#include <linux/uuid.h>17#include <linux/msdos_partition.h>18 19#include "ldm.h"20#include "check.h"21 22/*23 * ldm_debug/info/error/crit - Output an error message24 * @f: A printf format string containing the message25 * @...: Variables to substitute into @f26 *27 * ldm_debug() writes a DEBUG level message to the syslog but only if the28 * driver was compiled with debug enabled. Otherwise, the call turns into a NOP.29 */30#ifndef CONFIG_LDM_DEBUG31#define ldm_debug(...) do {} while (0)32#else33#define ldm_debug(f, a...) _ldm_printk (KERN_DEBUG, __func__, f, ##a)34#endif35 36#define ldm_crit(f, a...) _ldm_printk (KERN_CRIT, __func__, f, ##a)37#define ldm_error(f, a...) _ldm_printk (KERN_ERR, __func__, f, ##a)38#define ldm_info(f, a...) _ldm_printk (KERN_INFO, __func__, f, ##a)39 40static __printf(3, 4)41void _ldm_printk(const char *level, const char *function, const char *fmt, ...)42{43 struct va_format vaf;44 va_list args;45 46 va_start (args, fmt);47 48 vaf.fmt = fmt;49 vaf.va = &args;50 51 printk("%s%s(): %pV\n", level, function, &vaf);52 53 va_end(args);54}55 56/**57 * ldm_parse_privhead - Read the LDM Database PRIVHEAD structure58 * @data: Raw database PRIVHEAD structure loaded from the device59 * @ph: In-memory privhead structure in which to return parsed information60 *61 * This parses the LDM database PRIVHEAD structure supplied in @data and62 * sets up the in-memory privhead structure @ph with the obtained information.63 *64 * Return: 'true' @ph contains the PRIVHEAD data65 * 'false' @ph contents are undefined66 */67static bool ldm_parse_privhead(const u8 *data, struct privhead *ph)68{69 bool is_vista = false;70 71 BUG_ON(!data || !ph);72 if (MAGIC_PRIVHEAD != get_unaligned_be64(data)) {73 ldm_error("Cannot find PRIVHEAD structure. LDM database is"74 " corrupt. Aborting.");75 return false;76 }77 ph->ver_major = get_unaligned_be16(data + 0x000C);78 ph->ver_minor = get_unaligned_be16(data + 0x000E);79 ph->logical_disk_start = get_unaligned_be64(data + 0x011B);80 ph->logical_disk_size = get_unaligned_be64(data + 0x0123);81 ph->config_start = get_unaligned_be64(data + 0x012B);82 ph->config_size = get_unaligned_be64(data + 0x0133);83 /* Version 2.11 is Win2k/XP and version 2.12 is Vista. */84 if (ph->ver_major == 2 && ph->ver_minor == 12)85 is_vista = true;86 if (!is_vista && (ph->ver_major != 2 || ph->ver_minor != 11)) {87 ldm_error("Expected PRIVHEAD version 2.11 or 2.12, got %d.%d."88 " Aborting.", ph->ver_major, ph->ver_minor);89 return false;90 }91 ldm_debug("PRIVHEAD version %d.%d (Windows %s).", ph->ver_major,92 ph->ver_minor, is_vista ? "Vista" : "2000/XP");93 if (ph->config_size != LDM_DB_SIZE) { /* 1 MiB in sectors. */94 /* Warn the user and continue, carefully. */95 ldm_info("Database is normally %u bytes, it claims to "96 "be %llu bytes.", LDM_DB_SIZE,97 (unsigned long long)ph->config_size);98 }99 if ((ph->logical_disk_size == 0) || (ph->logical_disk_start +100 ph->logical_disk_size > ph->config_start)) {101 ldm_error("PRIVHEAD disk size doesn't match real disk size");102 return false;103 }104 if (uuid_parse(data + 0x0030, &ph->disk_id)) {105 ldm_error("PRIVHEAD contains an invalid GUID.");106 return false;107 }108 ldm_debug("Parsed PRIVHEAD successfully.");109 return true;110}111 112/**113 * ldm_parse_tocblock - Read the LDM Database TOCBLOCK structure114 * @data: Raw database TOCBLOCK structure loaded from the device115 * @toc: In-memory toc structure in which to return parsed information116 *117 * This parses the LDM Database TOCBLOCK (table of contents) structure supplied118 * in @data and sets up the in-memory tocblock structure @toc with the obtained119 * information.120 *121 * N.B. The *_start and *_size values returned in @toc are not range-checked.122 *123 * Return: 'true' @toc contains the TOCBLOCK data124 * 'false' @toc contents are undefined125 */126static bool ldm_parse_tocblock (const u8 *data, struct tocblock *toc)127{128 BUG_ON (!data || !toc);129 130 if (MAGIC_TOCBLOCK != get_unaligned_be64(data)) {131 ldm_crit ("Cannot find TOCBLOCK, database may be corrupt.");132 return false;133 }134 strscpy_pad(toc->bitmap1_name, data + 0x24, sizeof(toc->bitmap1_name));135 toc->bitmap1_start = get_unaligned_be64(data + 0x2E);136 toc->bitmap1_size = get_unaligned_be64(data + 0x36);137 138 if (strncmp (toc->bitmap1_name, TOC_BITMAP1,139 sizeof (toc->bitmap1_name)) != 0) {140 ldm_crit ("TOCBLOCK's first bitmap is '%s', should be '%s'.",141 TOC_BITMAP1, toc->bitmap1_name);142 return false;143 }144 strscpy_pad(toc->bitmap2_name, data + 0x46, sizeof(toc->bitmap2_name));145 toc->bitmap2_start = get_unaligned_be64(data + 0x50);146 toc->bitmap2_size = get_unaligned_be64(data + 0x58);147 if (strncmp (toc->bitmap2_name, TOC_BITMAP2,148 sizeof (toc->bitmap2_name)) != 0) {149 ldm_crit ("TOCBLOCK's second bitmap is '%s', should be '%s'.",150 TOC_BITMAP2, toc->bitmap2_name);151 return false;152 }153 ldm_debug ("Parsed TOCBLOCK successfully.");154 return true;155}156 157/**158 * ldm_parse_vmdb - Read the LDM Database VMDB structure159 * @data: Raw database VMDB structure loaded from the device160 * @vm: In-memory vmdb structure in which to return parsed information161 *162 * This parses the LDM Database VMDB structure supplied in @data and sets up163 * the in-memory vmdb structure @vm with the obtained information.164 *165 * N.B. The *_start, *_size and *_seq values will be range-checked later.166 *167 * Return: 'true' @vm contains VMDB info168 * 'false' @vm contents are undefined169 */170static bool ldm_parse_vmdb (const u8 *data, struct vmdb *vm)171{172 BUG_ON (!data || !vm);173 174 if (MAGIC_VMDB != get_unaligned_be32(data)) {175 ldm_crit ("Cannot find the VMDB, database may be corrupt.");176 return false;177 }178 179 vm->ver_major = get_unaligned_be16(data + 0x12);180 vm->ver_minor = get_unaligned_be16(data + 0x14);181 if ((vm->ver_major != 4) || (vm->ver_minor != 10)) {182 ldm_error ("Expected VMDB version %d.%d, got %d.%d. "183 "Aborting.", 4, 10, vm->ver_major, vm->ver_minor);184 return false;185 }186 187 vm->vblk_size = get_unaligned_be32(data + 0x08);188 if (vm->vblk_size == 0) {189 ldm_error ("Illegal VBLK size");190 return false;191 }192 193 vm->vblk_offset = get_unaligned_be32(data + 0x0C);194 vm->last_vblk_seq = get_unaligned_be32(data + 0x04);195 196 ldm_debug ("Parsed VMDB successfully.");197 return true;198}199 200/**201 * ldm_compare_privheads - Compare two privhead objects202 * @ph1: First privhead203 * @ph2: Second privhead204 *205 * This compares the two privhead structures @ph1 and @ph2.206 *207 * Return: 'true' Identical208 * 'false' Different209 */210static bool ldm_compare_privheads (const struct privhead *ph1,211 const struct privhead *ph2)212{213 BUG_ON (!ph1 || !ph2);214 215 return ((ph1->ver_major == ph2->ver_major) &&216 (ph1->ver_minor == ph2->ver_minor) &&217 (ph1->logical_disk_start == ph2->logical_disk_start) &&218 (ph1->logical_disk_size == ph2->logical_disk_size) &&219 (ph1->config_start == ph2->config_start) &&220 (ph1->config_size == ph2->config_size) &&221 uuid_equal(&ph1->disk_id, &ph2->disk_id));222}223 224/**225 * ldm_compare_tocblocks - Compare two tocblock objects226 * @toc1: First toc227 * @toc2: Second toc228 *229 * This compares the two tocblock structures @toc1 and @toc2.230 *231 * Return: 'true' Identical232 * 'false' Different233 */234static bool ldm_compare_tocblocks (const struct tocblock *toc1,235 const struct tocblock *toc2)236{237 BUG_ON (!toc1 || !toc2);238 239 return ((toc1->bitmap1_start == toc2->bitmap1_start) &&240 (toc1->bitmap1_size == toc2->bitmap1_size) &&241 (toc1->bitmap2_start == toc2->bitmap2_start) &&242 (toc1->bitmap2_size == toc2->bitmap2_size) &&243 !strncmp (toc1->bitmap1_name, toc2->bitmap1_name,244 sizeof (toc1->bitmap1_name)) &&245 !strncmp (toc1->bitmap2_name, toc2->bitmap2_name,246 sizeof (toc1->bitmap2_name)));247}248 249/**250 * ldm_validate_privheads - Compare the primary privhead with its backups251 * @state: Partition check state including device holding the LDM Database252 * @ph1: Memory struct to fill with ph contents253 *254 * Read and compare all three privheads from disk.255 *256 * The privheads on disk show the size and location of the main disk area and257 * the configuration area (the database). The values are range-checked against258 * @hd, which contains the real size of the disk.259 *260 * Return: 'true' Success261 * 'false' Error262 */263static bool ldm_validate_privheads(struct parsed_partitions *state,264 struct privhead *ph1)265{266 static const int off[3] = { OFF_PRIV1, OFF_PRIV2, OFF_PRIV3 };267 struct privhead *ph[3] = { ph1 };268 Sector sect;269 u8 *data;270 bool result = false;271 long num_sects;272 int i;273 274 BUG_ON (!state || !ph1);275 276 ph[1] = kmalloc (sizeof (*ph[1]), GFP_KERNEL);277 ph[2] = kmalloc (sizeof (*ph[2]), GFP_KERNEL);278 if (!ph[1] || !ph[2]) {279 ldm_crit ("Out of memory.");280 goto out;281 }282 283 /* off[1 & 2] are relative to ph[0]->config_start */284 ph[0]->config_start = 0;285 286 /* Read and parse privheads */287 for (i = 0; i < 3; i++) {288 data = read_part_sector(state, ph[0]->config_start + off[i],289 §);290 if (!data) {291 ldm_crit ("Disk read failed.");292 goto out;293 }294 result = ldm_parse_privhead (data, ph[i]);295 put_dev_sector (sect);296 if (!result) {297 ldm_error ("Cannot find PRIVHEAD %d.", i+1); /* Log again */298 if (i < 2)299 goto out; /* Already logged */300 else301 break; /* FIXME ignore for now, 3rd PH can fail on odd-sized disks */302 }303 }304 305 num_sects = get_capacity(state->disk);306 307 if ((ph[0]->config_start > num_sects) ||308 ((ph[0]->config_start + ph[0]->config_size) > num_sects)) {309 ldm_crit ("Database extends beyond the end of the disk.");310 goto out;311 }312 313 if ((ph[0]->logical_disk_start > ph[0]->config_start) ||314 ((ph[0]->logical_disk_start + ph[0]->logical_disk_size)315 > ph[0]->config_start)) {316 ldm_crit ("Disk and database overlap.");317 goto out;318 }319 320 if (!ldm_compare_privheads (ph[0], ph[1])) {321 ldm_crit ("Primary and backup PRIVHEADs don't match.");322 goto out;323 }324 /* FIXME ignore this for now325 if (!ldm_compare_privheads (ph[0], ph[2])) {326 ldm_crit ("Primary and backup PRIVHEADs don't match.");327 goto out;328 }*/329 ldm_debug ("Validated PRIVHEADs successfully.");330 result = true;331out:332 kfree (ph[1]);333 kfree (ph[2]);334 return result;335}336 337/**338 * ldm_validate_tocblocks - Validate the table of contents and its backups339 * @state: Partition check state including device holding the LDM Database340 * @base: Offset, into @state->disk, of the database341 * @ldb: Cache of the database structures342 *343 * Find and compare the four tables of contents of the LDM Database stored on344 * @state->disk and return the parsed information into @toc1.345 *346 * The offsets and sizes of the configs are range-checked against a privhead.347 *348 * Return: 'true' @toc1 contains validated TOCBLOCK info349 * 'false' @toc1 contents are undefined350 */351static bool ldm_validate_tocblocks(struct parsed_partitions *state,352 unsigned long base, struct ldmdb *ldb)353{354 static const int off[4] = { OFF_TOCB1, OFF_TOCB2, OFF_TOCB3, OFF_TOCB4};355 struct tocblock *tb[4];356 struct privhead *ph;357 Sector sect;358 u8 *data;359 int i, nr_tbs;360 bool result = false;361 362 BUG_ON(!state || !ldb);363 ph = &ldb->ph;364 tb[0] = &ldb->toc;365 tb[1] = kmalloc_array(3, sizeof(*tb[1]), GFP_KERNEL);366 if (!tb[1]) {367 ldm_crit("Out of memory.");368 goto err;369 }370 tb[2] = (struct tocblock*)((u8*)tb[1] + sizeof(*tb[1]));371 tb[3] = (struct tocblock*)((u8*)tb[2] + sizeof(*tb[2]));372 /*373 * Try to read and parse all four TOCBLOCKs.374 *375 * Windows Vista LDM v2.12 does not always have all four TOCBLOCKs so376 * skip any that fail as long as we get at least one valid TOCBLOCK.377 */378 for (nr_tbs = i = 0; i < 4; i++) {379 data = read_part_sector(state, base + off[i], §);380 if (!data) {381 ldm_error("Disk read failed for TOCBLOCK %d.", i);382 continue;383 }384 if (ldm_parse_tocblock(data, tb[nr_tbs]))385 nr_tbs++;386 put_dev_sector(sect);387 }388 if (!nr_tbs) {389 ldm_crit("Failed to find a valid TOCBLOCK.");390 goto err;391 }392 /* Range check the TOCBLOCK against a privhead. */393 if (((tb[0]->bitmap1_start + tb[0]->bitmap1_size) > ph->config_size) ||394 ((tb[0]->bitmap2_start + tb[0]->bitmap2_size) >395 ph->config_size)) {396 ldm_crit("The bitmaps are out of range. Giving up.");397 goto err;398 }399 /* Compare all loaded TOCBLOCKs. */400 for (i = 1; i < nr_tbs; i++) {401 if (!ldm_compare_tocblocks(tb[0], tb[i])) {402 ldm_crit("TOCBLOCKs 0 and %d do not match.", i);403 goto err;404 }405 }406 ldm_debug("Validated %d TOCBLOCKs successfully.", nr_tbs);407 result = true;408err:409 kfree(tb[1]);410 return result;411}412 413/**414 * ldm_validate_vmdb - Read the VMDB and validate it415 * @state: Partition check state including device holding the LDM Database416 * @base: Offset, into @bdev, of the database417 * @ldb: Cache of the database structures418 *419 * Find the vmdb of the LDM Database stored on @bdev and return the parsed420 * information in @ldb.421 *422 * Return: 'true' @ldb contains validated VBDB info423 * 'false' @ldb contents are undefined424 */425static bool ldm_validate_vmdb(struct parsed_partitions *state,426 unsigned long base, struct ldmdb *ldb)427{428 Sector sect;429 u8 *data;430 bool result = false;431 struct vmdb *vm;432 struct tocblock *toc;433 434 BUG_ON (!state || !ldb);435 436 vm = &ldb->vm;437 toc = &ldb->toc;438 439 data = read_part_sector(state, base + OFF_VMDB, §);440 if (!data) {441 ldm_crit ("Disk read failed.");442 return false;443 }444 445 if (!ldm_parse_vmdb (data, vm))446 goto out; /* Already logged */447 448 /* Are there uncommitted transactions? */449 if (get_unaligned_be16(data + 0x10) != 0x01) {450 ldm_crit ("Database is not in a consistent state. Aborting.");451 goto out;452 }453 454 if (vm->vblk_offset != 512)455 ldm_info ("VBLKs start at offset 0x%04x.", vm->vblk_offset);456 457 /*458 * The last_vblkd_seq can be before the end of the vmdb, just make sure459 * it is not out of bounds.460 */461 if ((vm->vblk_size * vm->last_vblk_seq) > (toc->bitmap1_size << 9)) {462 ldm_crit ("VMDB exceeds allowed size specified by TOCBLOCK. "463 "Database is corrupt. Aborting.");464 goto out;465 }466 467 result = true;468out:469 put_dev_sector (sect);470 return result;471}472 473 474/**475 * ldm_validate_partition_table - Determine whether bdev might be a dynamic disk476 * @state: Partition check state including device holding the LDM Database477 *478 * This function provides a weak test to decide whether the device is a dynamic479 * disk or not. It looks for an MS-DOS-style partition table containing at480 * least one partition of type 0x42 (formerly SFS, now used by Windows for481 * dynamic disks).482 *483 * N.B. The only possible error can come from the read_part_sector and that is484 * only likely to happen if the underlying device is strange. If that IS485 * the case we should return zero to let someone else try.486 *487 * Return: 'true' @state->disk is a dynamic disk488 * 'false' @state->disk is not a dynamic disk, or an error occurred489 */490static bool ldm_validate_partition_table(struct parsed_partitions *state)491{492 Sector sect;493 u8 *data;494 struct msdos_partition *p;495 int i;496 bool result = false;497 498 BUG_ON(!state);499 500 data = read_part_sector(state, 0, §);501 if (!data) {502 ldm_info ("Disk read failed.");503 return false;504 }505 506 if (*(__le16*) (data + 0x01FE) != cpu_to_le16 (MSDOS_LABEL_MAGIC))507 goto out;508 509 p = (struct msdos_partition *)(data + 0x01BE);510 for (i = 0; i < 4; i++, p++)511 if (p->sys_ind == LDM_PARTITION) {512 result = true;513 break;514 }515 516 if (result)517 ldm_debug ("Found W2K dynamic disk partition type.");518 519out:520 put_dev_sector (sect);521 return result;522}523 524/**525 * ldm_get_disk_objid - Search a linked list of vblk's for a given Disk Id526 * @ldb: Cache of the database structures527 *528 * The LDM Database contains a list of all partitions on all dynamic disks.529 * The primary PRIVHEAD, at the beginning of the physical disk, tells us530 * the GUID of this disk. This function searches for the GUID in a linked531 * list of vblk's.532 *533 * Return: Pointer, A matching vblk was found534 * NULL, No match, or an error535 */536static struct vblk * ldm_get_disk_objid (const struct ldmdb *ldb)537{538 struct list_head *item;539 540 BUG_ON (!ldb);541 542 list_for_each (item, &ldb->v_disk) {543 struct vblk *v = list_entry (item, struct vblk, list);544 if (uuid_equal(&v->vblk.disk.disk_id, &ldb->ph.disk_id))545 return v;546 }547 548 return NULL;549}550 551/**552 * ldm_create_data_partitions - Create data partitions for this device553 * @pp: List of the partitions parsed so far554 * @ldb: Cache of the database structures555 *556 * The database contains ALL the partitions for ALL disk groups, so we need to557 * filter out this specific disk. Using the disk's object id, we can find all558 * the partitions in the database that belong to this disk.559 *560 * Add each partition in our database, to the parsed_partitions structure.561 *562 * N.B. This function creates the partitions in the order it finds partition563 * objects in the linked list.564 *565 * Return: 'true' Partition created566 * 'false' Error, probably a range checking problem567 */568static bool ldm_create_data_partitions (struct parsed_partitions *pp,569 const struct ldmdb *ldb)570{571 struct list_head *item;572 struct vblk *vb;573 struct vblk *disk;574 struct vblk_part *part;575 int part_num = 1;576 577 BUG_ON (!pp || !ldb);578 579 disk = ldm_get_disk_objid (ldb);580 if (!disk) {581 ldm_crit ("Can't find the ID of this disk in the database.");582 return false;583 }584 585 strlcat(pp->pp_buf, " [LDM]", PAGE_SIZE);586 587 /* Create the data partitions */588 list_for_each (item, &ldb->v_part) {589 vb = list_entry (item, struct vblk, list);590 part = &vb->vblk.part;591 592 if (part->disk_id != disk->obj_id)593 continue;594 595 put_partition (pp, part_num, ldb->ph.logical_disk_start +596 part->start, part->size);597 part_num++;598 }599 600 strlcat(pp->pp_buf, "\n", PAGE_SIZE);601 return true;602}603 604 605/**606 * ldm_relative - Calculate the next relative offset607 * @buffer: Block of data being worked on608 * @buflen: Size of the block of data609 * @base: Size of the previous fixed width fields610 * @offset: Cumulative size of the previous variable-width fields611 *612 * Because many of the VBLK fields are variable-width, it's necessary613 * to calculate each offset based on the previous one and the length614 * of the field it pointed to.615 *616 * Return: -1 Error, the calculated offset exceeded the size of the buffer617 * n OK, a range-checked offset into buffer618 */619static int ldm_relative(const u8 *buffer, int buflen, int base, int offset)620{621 622 base += offset;623 if (!buffer || offset < 0 || base > buflen) {624 if (!buffer)625 ldm_error("!buffer");626 if (offset < 0)627 ldm_error("offset (%d) < 0", offset);628 if (base > buflen)629 ldm_error("base (%d) > buflen (%d)", base, buflen);630 return -1;631 }632 if (base + buffer[base] >= buflen) {633 ldm_error("base (%d) + buffer[base] (%d) >= buflen (%d)", base,634 buffer[base], buflen);635 return -1;636 }637 return buffer[base] + offset + 1;638}639 640/**641 * ldm_get_vnum - Convert a variable-width, big endian number, into cpu order642 * @block: Pointer to the variable-width number to convert643 *644 * Large numbers in the LDM Database are often stored in a packed format. Each645 * number is prefixed by a one byte width marker. All numbers in the database646 * are stored in big-endian byte order. This function reads one of these647 * numbers and returns the result648 *649 * N.B. This function DOES NOT perform any range checking, though the most650 * it will read is eight bytes.651 *652 * Return: n A number653 * 0 Zero, or an error occurred654 */655static u64 ldm_get_vnum (const u8 *block)656{657 u64 tmp = 0;658 u8 length;659 660 BUG_ON (!block);661 662 length = *block++;663 664 if (length && length <= 8)665 while (length--)666 tmp = (tmp << 8) | *block++;667 else668 ldm_error ("Illegal length %d.", length);669 670 return tmp;671}672 673/**674 * ldm_get_vstr - Read a length-prefixed string into a buffer675 * @block: Pointer to the length marker676 * @buffer: Location to copy string to677 * @buflen: Size of the output buffer678 *679 * Many of the strings in the LDM Database are not NULL terminated. Instead680 * they are prefixed by a one byte length marker. This function copies one of681 * these strings into a buffer.682 *683 * N.B. This function DOES NOT perform any range checking on the input.684 * If the buffer is too small, the output will be truncated.685 *686 * Return: 0, Error and @buffer contents are undefined687 * n, String length in characters (excluding NULL)688 * buflen-1, String was truncated.689 */690static int ldm_get_vstr (const u8 *block, u8 *buffer, int buflen)691{692 int length;693 694 BUG_ON (!block || !buffer);695 696 length = block[0];697 if (length >= buflen) {698 ldm_error ("Truncating string %d -> %d.", length, buflen);699 length = buflen - 1;700 }701 memcpy (buffer, block + 1, length);702 buffer[length] = 0;703 return length;704}705 706 707/**708 * ldm_parse_cmp3 - Read a raw VBLK Component object into a vblk structure709 * @buffer: Block of data being worked on710 * @buflen: Size of the block of data711 * @vb: In-memory vblk in which to return information712 *713 * Read a raw VBLK Component object (version 3) into a vblk structure.714 *715 * Return: 'true' @vb contains a Component VBLK716 * 'false' @vb contents are not defined717 */718static bool ldm_parse_cmp3 (const u8 *buffer, int buflen, struct vblk *vb)719{720 int r_objid, r_name, r_vstate, r_child, r_parent, r_stripe, r_cols, len;721 struct vblk_comp *comp;722 723 BUG_ON (!buffer || !vb);724 725 r_objid = ldm_relative (buffer, buflen, 0x18, 0);726 r_name = ldm_relative (buffer, buflen, 0x18, r_objid);727 r_vstate = ldm_relative (buffer, buflen, 0x18, r_name);728 r_child = ldm_relative (buffer, buflen, 0x1D, r_vstate);729 r_parent = ldm_relative (buffer, buflen, 0x2D, r_child);730 731 if (buffer[0x12] & VBLK_FLAG_COMP_STRIPE) {732 r_stripe = ldm_relative (buffer, buflen, 0x2E, r_parent);733 r_cols = ldm_relative (buffer, buflen, 0x2E, r_stripe);734 len = r_cols;735 } else {736 r_stripe = 0;737 len = r_parent;738 }739 if (len < 0)740 return false;741 742 len += VBLK_SIZE_CMP3;743 if (len != get_unaligned_be32(buffer + 0x14))744 return false;745 746 comp = &vb->vblk.comp;747 ldm_get_vstr (buffer + 0x18 + r_name, comp->state,748 sizeof (comp->state));749 comp->type = buffer[0x18 + r_vstate];750 comp->children = ldm_get_vnum (buffer + 0x1D + r_vstate);751 comp->parent_id = ldm_get_vnum (buffer + 0x2D + r_child);752 comp->chunksize = r_stripe ? ldm_get_vnum (buffer+r_parent+0x2E) : 0;753 754 return true;755}756 757/**758 * ldm_parse_dgr3 - Read a raw VBLK Disk Group object into a vblk structure759 * @buffer: Block of data being worked on760 * @buflen: Size of the block of data761 * @vb: In-memory vblk in which to return information762 *763 * Read a raw VBLK Disk Group object (version 3) into a vblk structure.764 *765 * Return: 'true' @vb contains a Disk Group VBLK766 * 'false' @vb contents are not defined767 */768static int ldm_parse_dgr3 (const u8 *buffer, int buflen, struct vblk *vb)769{770 int r_objid, r_name, r_diskid, r_id1, r_id2, len;771 struct vblk_dgrp *dgrp;772 773 BUG_ON (!buffer || !vb);774 775 r_objid = ldm_relative (buffer, buflen, 0x18, 0);776 r_name = ldm_relative (buffer, buflen, 0x18, r_objid);777 r_diskid = ldm_relative (buffer, buflen, 0x18, r_name);778 779 if (buffer[0x12] & VBLK_FLAG_DGR3_IDS) {780 r_id1 = ldm_relative (buffer, buflen, 0x24, r_diskid);781 r_id2 = ldm_relative (buffer, buflen, 0x24, r_id1);782 len = r_id2;783 } else784 len = r_diskid;785 if (len < 0)786 return false;787 788 len += VBLK_SIZE_DGR3;789 if (len != get_unaligned_be32(buffer + 0x14))790 return false;791 792 dgrp = &vb->vblk.dgrp;793 ldm_get_vstr (buffer + 0x18 + r_name, dgrp->disk_id,794 sizeof (dgrp->disk_id));795 return true;796}797 798/**799 * ldm_parse_dgr4 - Read a raw VBLK Disk Group object into a vblk structure800 * @buffer: Block of data being worked on801 * @buflen: Size of the block of data802 * @vb: In-memory vblk in which to return information803 *804 * Read a raw VBLK Disk Group object (version 4) into a vblk structure.805 *806 * Return: 'true' @vb contains a Disk Group VBLK807 * 'false' @vb contents are not defined808 */809static bool ldm_parse_dgr4 (const u8 *buffer, int buflen, struct vblk *vb)810{811 char buf[64];812 int r_objid, r_name, r_id1, r_id2, len;813 814 BUG_ON (!buffer || !vb);815 816 r_objid = ldm_relative (buffer, buflen, 0x18, 0);817 r_name = ldm_relative (buffer, buflen, 0x18, r_objid);818 819 if (buffer[0x12] & VBLK_FLAG_DGR4_IDS) {820 r_id1 = ldm_relative (buffer, buflen, 0x44, r_name);821 r_id2 = ldm_relative (buffer, buflen, 0x44, r_id1);822 len = r_id2;823 } else824 len = r_name;825 if (len < 0)826 return false;827 828 len += VBLK_SIZE_DGR4;829 if (len != get_unaligned_be32(buffer + 0x14))830 return false;831 832 ldm_get_vstr (buffer + 0x18 + r_objid, buf, sizeof (buf));833 return true;834}835 836/**837 * ldm_parse_dsk3 - Read a raw VBLK Disk object into a vblk structure838 * @buffer: Block of data being worked on839 * @buflen: Size of the block of data840 * @vb: In-memory vblk in which to return information841 *842 * Read a raw VBLK Disk object (version 3) into a vblk structure.843 *844 * Return: 'true' @vb contains a Disk VBLK845 * 'false' @vb contents are not defined846 */847static bool ldm_parse_dsk3 (const u8 *buffer, int buflen, struct vblk *vb)848{849 int r_objid, r_name, r_diskid, r_altname, len;850 struct vblk_disk *disk;851 852 BUG_ON (!buffer || !vb);853 854 r_objid = ldm_relative (buffer, buflen, 0x18, 0);855 r_name = ldm_relative (buffer, buflen, 0x18, r_objid);856 r_diskid = ldm_relative (buffer, buflen, 0x18, r_name);857 r_altname = ldm_relative (buffer, buflen, 0x18, r_diskid);858 len = r_altname;859 if (len < 0)860 return false;861 862 len += VBLK_SIZE_DSK3;863 if (len != get_unaligned_be32(buffer + 0x14))864 return false;865 866 disk = &vb->vblk.disk;867 ldm_get_vstr (buffer + 0x18 + r_diskid, disk->alt_name,868 sizeof (disk->alt_name));869 if (uuid_parse(buffer + 0x19 + r_name, &disk->disk_id))870 return false;871 872 return true;873}874 875/**876 * ldm_parse_dsk4 - Read a raw VBLK Disk object into a vblk structure877 * @buffer: Block of data being worked on878 * @buflen: Size of the block of data879 * @vb: In-memory vblk in which to return information880 *881 * Read a raw VBLK Disk object (version 4) into a vblk structure.882 *883 * Return: 'true' @vb contains a Disk VBLK884 * 'false' @vb contents are not defined885 */886static bool ldm_parse_dsk4 (const u8 *buffer, int buflen, struct vblk *vb)887{888 int r_objid, r_name, len;889 struct vblk_disk *disk;890 891 BUG_ON (!buffer || !vb);892 893 r_objid = ldm_relative (buffer, buflen, 0x18, 0);894 r_name = ldm_relative (buffer, buflen, 0x18, r_objid);895 len = r_name;896 if (len < 0)897 return false;898 899 len += VBLK_SIZE_DSK4;900 if (len != get_unaligned_be32(buffer + 0x14))901 return false;902 903 disk = &vb->vblk.disk;904 import_uuid(&disk->disk_id, buffer + 0x18 + r_name);905 return true;906}907 908/**909 * ldm_parse_prt3 - Read a raw VBLK Partition object into a vblk structure910 * @buffer: Block of data being worked on911 * @buflen: Size of the block of data912 * @vb: In-memory vblk in which to return information913 *914 * Read a raw VBLK Partition object (version 3) into a vblk structure.915 *916 * Return: 'true' @vb contains a Partition VBLK917 * 'false' @vb contents are not defined918 */919static bool ldm_parse_prt3(const u8 *buffer, int buflen, struct vblk *vb)920{921 int r_objid, r_name, r_size, r_parent, r_diskid, r_index, len;922 struct vblk_part *part;923 924 BUG_ON(!buffer || !vb);925 r_objid = ldm_relative(buffer, buflen, 0x18, 0);926 if (r_objid < 0) {927 ldm_error("r_objid %d < 0", r_objid);928 return false;929 }930 r_name = ldm_relative(buffer, buflen, 0x18, r_objid);931 if (r_name < 0) {932 ldm_error("r_name %d < 0", r_name);933 return false;934 }935 r_size = ldm_relative(buffer, buflen, 0x34, r_name);936 if (r_size < 0) {937 ldm_error("r_size %d < 0", r_size);938 return false;939 }940 r_parent = ldm_relative(buffer, buflen, 0x34, r_size);941 if (r_parent < 0) {942 ldm_error("r_parent %d < 0", r_parent);943 return false;944 }945 r_diskid = ldm_relative(buffer, buflen, 0x34, r_parent);946 if (r_diskid < 0) {947 ldm_error("r_diskid %d < 0", r_diskid);948 return false;949 }950 if (buffer[0x12] & VBLK_FLAG_PART_INDEX) {951 r_index = ldm_relative(buffer, buflen, 0x34, r_diskid);952 if (r_index < 0) {953 ldm_error("r_index %d < 0", r_index);954 return false;955 }956 len = r_index;957 } else958 len = r_diskid;959 if (len < 0) {960 ldm_error("len %d < 0", len);961 return false;962 }963 len += VBLK_SIZE_PRT3;964 if (len > get_unaligned_be32(buffer + 0x14)) {965 ldm_error("len %d > BE32(buffer + 0x14) %d", len,966 get_unaligned_be32(buffer + 0x14));967 return false;968 }969 part = &vb->vblk.part;970 part->start = get_unaligned_be64(buffer + 0x24 + r_name);971 part->volume_offset = get_unaligned_be64(buffer + 0x2C + r_name);972 part->size = ldm_get_vnum(buffer + 0x34 + r_name);973 part->parent_id = ldm_get_vnum(buffer + 0x34 + r_size);974 part->disk_id = ldm_get_vnum(buffer + 0x34 + r_parent);975 if (vb->flags & VBLK_FLAG_PART_INDEX)976 part->partnum = buffer[0x35 + r_diskid];977 else978 part->partnum = 0;979 return true;980}981 982/**983 * ldm_parse_vol5 - Read a raw VBLK Volume object into a vblk structure984 * @buffer: Block of data being worked on985 * @buflen: Size of the block of data986 * @vb: In-memory vblk in which to return information987 *988 * Read a raw VBLK Volume object (version 5) into a vblk structure.989 *990 * Return: 'true' @vb contains a Volume VBLK991 * 'false' @vb contents are not defined992 */993static bool ldm_parse_vol5(const u8 *buffer, int buflen, struct vblk *vb)994{995 int r_objid, r_name, r_vtype, r_disable_drive_letter, r_child, r_size;996 int r_id1, r_id2, r_size2, r_drive, len;997 struct vblk_volu *volu;998 999 BUG_ON(!buffer || !vb);1000 r_objid = ldm_relative(buffer, buflen, 0x18, 0);1001 if (r_objid < 0) {1002 ldm_error("r_objid %d < 0", r_objid);1003 return false;1004 }1005 r_name = ldm_relative(buffer, buflen, 0x18, r_objid);1006 if (r_name < 0) {1007 ldm_error("r_name %d < 0", r_name);1008 return false;1009 }1010 r_vtype = ldm_relative(buffer, buflen, 0x18, r_name);1011 if (r_vtype < 0) {1012 ldm_error("r_vtype %d < 0", r_vtype);1013 return false;1014 }1015 r_disable_drive_letter = ldm_relative(buffer, buflen, 0x18, r_vtype);1016 if (r_disable_drive_letter < 0) {1017 ldm_error("r_disable_drive_letter %d < 0",1018 r_disable_drive_letter);1019 return false;1020 }1021 r_child = ldm_relative(buffer, buflen, 0x2D, r_disable_drive_letter);1022 if (r_child < 0) {1023 ldm_error("r_child %d < 0", r_child);1024 return false;1025 }1026 r_size = ldm_relative(buffer, buflen, 0x3D, r_child);1027 if (r_size < 0) {1028 ldm_error("r_size %d < 0", r_size);1029 return false;1030 }1031 if (buffer[0x12] & VBLK_FLAG_VOLU_ID1) {1032 r_id1 = ldm_relative(buffer, buflen, 0x52, r_size);1033 if (r_id1 < 0) {1034 ldm_error("r_id1 %d < 0", r_id1);1035 return false;1036 }1037 } else1038 r_id1 = r_size;1039 if (buffer[0x12] & VBLK_FLAG_VOLU_ID2) {1040 r_id2 = ldm_relative(buffer, buflen, 0x52, r_id1);1041 if (r_id2 < 0) {1042 ldm_error("r_id2 %d < 0", r_id2);1043 return false;1044 }1045 } else1046 r_id2 = r_id1;1047 if (buffer[0x12] & VBLK_FLAG_VOLU_SIZE) {1048 r_size2 = ldm_relative(buffer, buflen, 0x52, r_id2);1049 if (r_size2 < 0) {1050 ldm_error("r_size2 %d < 0", r_size2);1051 return false;1052 }1053 } else1054 r_size2 = r_id2;1055 if (buffer[0x12] & VBLK_FLAG_VOLU_DRIVE) {1056 r_drive = ldm_relative(buffer, buflen, 0x52, r_size2);1057 if (r_drive < 0) {1058 ldm_error("r_drive %d < 0", r_drive);1059 return false;1060 }1061 } else1062 r_drive = r_size2;1063 len = r_drive;1064 if (len < 0) {1065 ldm_error("len %d < 0", len);1066 return false;1067 }1068 len += VBLK_SIZE_VOL5;1069 if (len > get_unaligned_be32(buffer + 0x14)) {1070 ldm_error("len %d > BE32(buffer + 0x14) %d", len,1071 get_unaligned_be32(buffer + 0x14));1072 return false;1073 }1074 volu = &vb->vblk.volu;1075 ldm_get_vstr(buffer + 0x18 + r_name, volu->volume_type,1076 sizeof(volu->volume_type));1077 memcpy(volu->volume_state, buffer + 0x18 + r_disable_drive_letter,1078 sizeof(volu->volume_state));1079 volu->size = ldm_get_vnum(buffer + 0x3D + r_child);1080 volu->partition_type = buffer[0x41 + r_size];1081 memcpy(volu->guid, buffer + 0x42 + r_size, sizeof(volu->guid));1082 if (buffer[0x12] & VBLK_FLAG_VOLU_DRIVE) {1083 ldm_get_vstr(buffer + 0x52 + r_size, volu->drive_hint,1084 sizeof(volu->drive_hint));1085 }1086 return true;1087}1088 1089/**1090 * ldm_parse_vblk - Read a raw VBLK object into a vblk structure1091 * @buf: Block of data being worked on1092 * @len: Size of the block of data1093 * @vb: In-memory vblk in which to return information1094 *1095 * Read a raw VBLK object into a vblk structure. This function just reads the1096 * information common to all VBLK types, then delegates the rest of the work to1097 * helper functions: ldm_parse_*.1098 *1099 * Return: 'true' @vb contains a VBLK1100 * 'false' @vb contents are not defined1101 */1102static bool ldm_parse_vblk (const u8 *buf, int len, struct vblk *vb)1103{1104 bool result = false;1105 int r_objid;1106 1107 BUG_ON (!buf || !vb);1108 1109 r_objid = ldm_relative (buf, len, 0x18, 0);1110 if (r_objid < 0) {1111 ldm_error ("VBLK header is corrupt.");1112 return false;1113 }1114 1115 vb->flags = buf[0x12];1116 vb->type = buf[0x13];1117 vb->obj_id = ldm_get_vnum (buf + 0x18);1118 ldm_get_vstr (buf+0x18+r_objid, vb->name, sizeof (vb->name));1119 1120 switch (vb->type) {1121 case VBLK_CMP3: result = ldm_parse_cmp3 (buf, len, vb); break;1122 case VBLK_DSK3: result = ldm_parse_dsk3 (buf, len, vb); break;1123 case VBLK_DSK4: result = ldm_parse_dsk4 (buf, len, vb); break;1124 case VBLK_DGR3: result = ldm_parse_dgr3 (buf, len, vb); break;1125 case VBLK_DGR4: result = ldm_parse_dgr4 (buf, len, vb); break;1126 case VBLK_PRT3: result = ldm_parse_prt3 (buf, len, vb); break;1127 case VBLK_VOL5: result = ldm_parse_vol5 (buf, len, vb); break;1128 }1129 1130 if (result)1131 ldm_debug ("Parsed VBLK 0x%llx (type: 0x%02x) ok.",1132 (unsigned long long) vb->obj_id, vb->type);1133 else1134 ldm_error ("Failed to parse VBLK 0x%llx (type: 0x%02x).",1135 (unsigned long long) vb->obj_id, vb->type);1136 1137 return result;1138}1139 1140 1141/**1142 * ldm_ldmdb_add - Adds a raw VBLK entry to the ldmdb database1143 * @data: Raw VBLK to add to the database1144 * @len: Size of the raw VBLK1145 * @ldb: Cache of the database structures1146 *1147 * The VBLKs are sorted into categories. Partitions are also sorted by offset.1148 *1149 * N.B. This function does not check the validity of the VBLKs.1150 *1151 * Return: 'true' The VBLK was added1152 * 'false' An error occurred1153 */1154static bool ldm_ldmdb_add (u8 *data, int len, struct ldmdb *ldb)1155{1156 struct vblk *vb;1157 struct list_head *item;1158 1159 BUG_ON (!data || !ldb);1160 1161 vb = kmalloc (sizeof (*vb), GFP_KERNEL);1162 if (!vb) {1163 ldm_crit ("Out of memory.");1164 return false;1165 }1166 1167 if (!ldm_parse_vblk (data, len, vb)) {1168 kfree(vb);1169 return false; /* Already logged */1170 }1171 1172 /* Put vblk into the correct list. */1173 switch (vb->type) {1174 case VBLK_DGR3:1175 case VBLK_DGR4:1176 list_add (&vb->list, &ldb->v_dgrp);1177 break;1178 case VBLK_DSK3:1179 case VBLK_DSK4:1180 list_add (&vb->list, &ldb->v_disk);1181 break;1182 case VBLK_VOL5:1183 list_add (&vb->list, &ldb->v_volu);1184 break;1185 case VBLK_CMP3:1186 list_add (&vb->list, &ldb->v_comp);1187 break;1188 case VBLK_PRT3:1189 /* Sort by the partition's start sector. */1190 list_for_each (item, &ldb->v_part) {1191 struct vblk *v = list_entry (item, struct vblk, list);1192 if ((v->vblk.part.disk_id == vb->vblk.part.disk_id) &&1193 (v->vblk.part.start > vb->vblk.part.start)) {1194 list_add_tail (&vb->list, &v->list);1195 return true;1196 }1197 }1198 list_add_tail (&vb->list, &ldb->v_part);1199 break;1200 }1201 return true;1202}1203 1204/**1205 * ldm_frag_add - Add a VBLK fragment to a list1206 * @data: Raw fragment to be added to the list1207 * @size: Size of the raw fragment1208 * @frags: Linked list of VBLK fragments1209 *1210 * Fragmented VBLKs may not be consecutive in the database, so they are placed1211 * in a list so they can be pieced together later.1212 *1213 * Return: 'true' Success, the VBLK was added to the list1214 * 'false' Error, a problem occurred1215 */1216static bool ldm_frag_add (const u8 *data, int size, struct list_head *frags)1217{1218 struct frag *f;1219 struct list_head *item;1220 int rec, num, group;1221 1222 BUG_ON (!data || !frags);1223 1224 if (size < 2 * VBLK_SIZE_HEAD) {1225 ldm_error("Value of size is too small.");1226 return false;1227 }1228 1229 group = get_unaligned_be32(data + 0x08);1230 rec = get_unaligned_be16(data + 0x0C);1231 num = get_unaligned_be16(data + 0x0E);1232 if ((num < 1) || (num > 4)) {1233 ldm_error ("A VBLK claims to have %d parts.", num);1234 return false;1235 }1236 if (rec >= num) {1237 ldm_error("REC value (%d) exceeds NUM value (%d)", rec, num);1238 return false;1239 }1240 1241 list_for_each (item, frags) {1242 f = list_entry (item, struct frag, list);1243 if (f->group == group)1244 goto found;1245 }1246 1247 f = kmalloc (sizeof (*f) + size*num, GFP_KERNEL);1248 if (!f) {1249 ldm_crit ("Out of memory.");1250 return false;1251 }1252 1253 f->group = group;1254 f->num = num;1255 f->rec = rec;1256 f->map = 0xFF << num;1257 1258 list_add_tail (&f->list, frags);1259found:1260 if (rec >= f->num) {1261 ldm_error("REC value (%d) exceeds NUM value (%d)", rec, f->num);1262 return false;1263 }1264 if (f->map & (1 << rec)) {1265 ldm_error ("Duplicate VBLK, part %d.", rec);1266 f->map &= 0x7F; /* Mark the group as broken */1267 return false;1268 }1269 f->map |= (1 << rec);1270 if (!rec)1271 memcpy(f->data, data, VBLK_SIZE_HEAD);1272 data += VBLK_SIZE_HEAD;1273 size -= VBLK_SIZE_HEAD;1274 memcpy(f->data + VBLK_SIZE_HEAD + rec * size, data, size);1275 return true;1276}1277 1278/**1279 * ldm_frag_free - Free a linked list of VBLK fragments1280 * @list: Linked list of fragments1281 *1282 * Free a linked list of VBLK fragments1283 *1284 * Return: none1285 */1286static void ldm_frag_free (struct list_head *list)1287{1288 struct list_head *item, *tmp;1289 1290 BUG_ON (!list);1291 1292 list_for_each_safe (item, tmp, list)1293 kfree (list_entry (item, struct frag, list));1294}1295 1296/**1297 * ldm_frag_commit - Validate fragmented VBLKs and add them to the database1298 * @frags: Linked list of VBLK fragments1299 * @ldb: Cache of the database structures1300 *1301 * Now that all the fragmented VBLKs have been collected, they must be added to1302 * the database for later use.1303 *1304 * Return: 'true' All the fragments we added successfully1305 * 'false' One or more of the fragments we invalid1306 */1307static bool ldm_frag_commit (struct list_head *frags, struct ldmdb *ldb)1308{1309 struct frag *f;1310 struct list_head *item;1311 1312 BUG_ON (!frags || !ldb);1313 1314 list_for_each (item, frags) {1315 f = list_entry (item, struct frag, list);1316 1317 if (f->map != 0xFF) {1318 ldm_error ("VBLK group %d is incomplete (0x%02x).",1319 f->group, f->map);1320 return false;1321 }1322 1323 if (!ldm_ldmdb_add (f->data, f->num*ldb->vm.vblk_size, ldb))1324 return false; /* Already logged */1325 }1326 return true;1327}1328 1329/**1330 * ldm_get_vblks - Read the on-disk database of VBLKs into memory1331 * @state: Partition check state including device holding the LDM Database1332 * @base: Offset, into @state->disk, of the database1333 * @ldb: Cache of the database structures1334 *1335 * To use the information from the VBLKs, they need to be read from the disk,1336 * unpacked and validated. We cache them in @ldb according to their type.1337 *1338 * Return: 'true' All the VBLKs were read successfully1339 * 'false' An error occurred1340 */1341static bool ldm_get_vblks(struct parsed_partitions *state, unsigned long base,1342 struct ldmdb *ldb)1343{1344 int size, perbuf, skip, finish, s, v, recs;1345 u8 *data = NULL;1346 Sector sect;1347 bool result = false;1348 LIST_HEAD (frags);1349 1350 BUG_ON(!state || !ldb);1351 1352 size = ldb->vm.vblk_size;1353 perbuf = 512 / size;1354 skip = ldb->vm.vblk_offset >> 9; /* Bytes to sectors */1355 finish = (size * ldb->vm.last_vblk_seq) >> 9;1356 1357 for (s = skip; s < finish; s++) { /* For each sector */1358 data = read_part_sector(state, base + OFF_VMDB + s, §);1359 if (!data) {1360 ldm_crit ("Disk read failed.");1361 goto out;1362 }1363 1364 for (v = 0; v < perbuf; v++, data+=size) { /* For each vblk */1365 if (MAGIC_VBLK != get_unaligned_be32(data)) {1366 ldm_error ("Expected to find a VBLK.");1367 goto out;1368 }1369 1370 recs = get_unaligned_be16(data + 0x0E); /* Number of records */1371 if (recs == 1) {1372 if (!ldm_ldmdb_add (data, size, ldb))1373 goto out; /* Already logged */1374 } else if (recs > 1) {1375 if (!ldm_frag_add (data, size, &frags))1376 goto out; /* Already logged */1377 }1378 /* else Record is not in use, ignore it. */1379 }1380 put_dev_sector (sect);1381 data = NULL;1382 }1383 1384 result = ldm_frag_commit (&frags, ldb); /* Failures, already logged */1385out:1386 if (data)1387 put_dev_sector (sect);1388 ldm_frag_free (&frags);1389 1390 return result;1391}1392 1393/**1394 * ldm_free_vblks - Free a linked list of vblk's1395 * @lh: Head of a linked list of struct vblk1396 *1397 * Free a list of vblk's and free the memory used to maintain the list.1398 *1399 * Return: none1400 */1401static void ldm_free_vblks (struct list_head *lh)1402{1403 struct list_head *item, *tmp;1404 1405 BUG_ON (!lh);1406 1407 list_for_each_safe (item, tmp, lh)1408 kfree (list_entry (item, struct vblk, list));1409}1410 1411 1412/**1413 * ldm_partition - Find out whether a device is a dynamic disk and handle it1414 * @state: Partition check state including device holding the LDM Database1415 *1416 * This determines whether the device @bdev is a dynamic disk and if so creates1417 * the partitions necessary in the gendisk structure pointed to by @hd.1418 *1419 * We create a dummy device 1, which contains the LDM database, and then create1420 * each partition described by the LDM database in sequence as devices 2+. For1421 * example, if the device is hda, we would have: hda1: LDM database, hda2, hda3,1422 * and so on: the actual data containing partitions.1423 *1424 * Return: 1 Success, @state->disk is a dynamic disk and we handled it1425 * 0 Success, @state->disk is not a dynamic disk1426 * -1 An error occurred before enough information had been read1427 * Or @state->disk is a dynamic disk, but it may be corrupted1428 */1429int ldm_partition(struct parsed_partitions *state)1430{1431 struct ldmdb *ldb;1432 unsigned long base;1433 int result = -1;1434 1435 BUG_ON(!state);1436 1437 /* Look for signs of a Dynamic Disk */1438 if (!ldm_validate_partition_table(state))1439 return 0;1440 1441 ldb = kmalloc (sizeof (*ldb), GFP_KERNEL);1442 if (!ldb) {1443 ldm_crit ("Out of memory.");1444 goto out;1445 }1446 1447 /* Parse and check privheads. */1448 if (!ldm_validate_privheads(state, &ldb->ph))1449 goto out; /* Already logged */1450 1451 /* All further references are relative to base (database start). */1452 base = ldb->ph.config_start;1453 1454 /* Parse and check tocs and vmdb. */1455 if (!ldm_validate_tocblocks(state, base, ldb) ||1456 !ldm_validate_vmdb(state, base, ldb))1457 goto out; /* Already logged */1458 1459 /* Initialize vblk lists in ldmdb struct */1460 INIT_LIST_HEAD (&ldb->v_dgrp);1461 INIT_LIST_HEAD (&ldb->v_disk);1462 INIT_LIST_HEAD (&ldb->v_volu);1463 INIT_LIST_HEAD (&ldb->v_comp);1464 INIT_LIST_HEAD (&ldb->v_part);1465 1466 if (!ldm_get_vblks(state, base, ldb)) {1467 ldm_crit ("Failed to read the VBLKs from the database.");1468 goto cleanup;1469 }1470 1471 /* Finally, create the data partition devices. */1472 if (ldm_create_data_partitions(state, ldb)) {1473 ldm_debug ("Parsed LDM database successfully.");1474 result = 1;1475 }1476 /* else Already logged */1477 1478cleanup:1479 ldm_free_vblks (&ldb->v_dgrp);1480 ldm_free_vblks (&ldb->v_disk);1481 ldm_free_vblks (&ldb->v_volu);1482 ldm_free_vblks (&ldb->v_comp);1483 ldm_free_vblks (&ldb->v_part);1484out:1485 kfree (ldb);1486 return result;1487}1488