1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
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 Altaparmakov
7 * 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 message
24 * @f: A printf format string containing the message
25 * @...: Variables to substitute into @f
26 *
27 * ldm_debug() writes a DEBUG level message to the syslog but only if the
28 * driver was compiled with debug enabled. Otherwise, the call turns into a NOP.
29 */
30 #ifndef CONFIG_LDM_DEBUG
31 #define ldm_debug(...) do {} while (0)
32 #else
33 #define ldm_debug(f, a...) _ldm_printk (KERN_DEBUG, __func__, f, ##a)
34 #endif
35
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
40 static __printf(3, 4)
41 void _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 structure
58 * @data: Raw database PRIVHEAD structure loaded from the device
59 * @ph: In-memory privhead structure in which to return parsed information
60 *
61 * This parses the LDM database PRIVHEAD structure supplied in @data and
62 * sets up the in-memory privhead structure @ph with the obtained information.
63 *
64 * Return: 'true' @ph contains the PRIVHEAD data
65 * 'false' @ph contents are undefined
66 */
67 static 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 structure
114 * @data: Raw database TOCBLOCK structure loaded from the device
115 * @toc: In-memory toc structure in which to return parsed information
116 *
117 * This parses the LDM Database TOCBLOCK (table of contents) structure supplied
118 * in @data and sets up the in-memory tocblock structure @toc with the obtained
119 * 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 data
124 * 'false' @toc contents are undefined
125 */
126 static 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 structure
159 * @data: Raw database VMDB structure loaded from the device
160 * @vm: In-memory vmdb structure in which to return parsed information
161 *
162 * This parses the LDM Database VMDB structure supplied in @data and sets up
163 * 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 info
168 * 'false' @vm contents are undefined
169 */
170 static 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 objects
202 * @ph1: First privhead
203 * @ph2: Second privhead
204 *
205 * This compares the two privhead structures @ph1 and @ph2.
206 *
207 * Return: 'true' Identical
208 * 'false' Different
209 */
210 static 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 objects
226 * @toc1: First toc
227 * @toc2: Second toc
228 *
229 * This compares the two tocblock structures @toc1 and @toc2.
230 *
231 * Return: 'true' Identical
232 * 'false' Different
233 */
234 static 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 backups
251 * @state: Partition check state including device holding the LDM Database
252 * @ph1: Memory struct to fill with ph contents
253 *
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 and
257 * the configuration area (the database). The values are range-checked against
258 * @hd, which contains the real size of the disk.
259 *
260 * Return: 'true' Success
261 * 'false' Error
262 */
263 static 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 else
301 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 now
325 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;
331 out:
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 backups
339 * @state: Partition check state including device holding the LDM Database
340 * @base: Offset, into @state->disk, of the database
341 * @ldb: Cache of the database structures
342 *
343 * Find and compare the four tables of contents of the LDM Database stored on
344 * @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 info
349 * 'false' @toc1 contents are undefined
350 */
351 static 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 so
376 * 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;
408 err:
409 kfree(tb[1]);
410 return result;
411 }
412
413 /**
414 * ldm_validate_vmdb - Read the VMDB and validate it
415 * @state: Partition check state including device holding the LDM Database
416 * @base: Offset, into @bdev, of the database
417 * @ldb: Cache of the database structures
418 *
419 * Find the vmdb of the LDM Database stored on @bdev and return the parsed
420 * information in @ldb.
421 *
422 * Return: 'true' @ldb contains validated VBDB info
423 * 'false' @ldb contents are undefined
424 */
425 static 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 sure
459 * 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;
468 out:
469 put_dev_sector (sect);
470 return result;
471 }
472
473
474 /**
475 * ldm_validate_partition_table - Determine whether bdev might be a dynamic disk
476 * @state: Partition check state including device holding the LDM Database
477 *
478 * This function provides a weak test to decide whether the device is a dynamic
479 * disk or not. It looks for an MS-DOS-style partition table containing at
480 * least one partition of type 0x42 (formerly SFS, now used by Windows for
481 * dynamic disks).
482 *
483 * N.B. The only possible error can come from the read_part_sector and that is
484 * only likely to happen if the underlying device is strange. If that IS
485 * the case we should return zero to let someone else try.
486 *
487 * Return: 'true' @state->disk is a dynamic disk
488 * 'false' @state->disk is not a dynamic disk, or an error occurred
489 */
490 static 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
519 out:
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 Id
526 * @ldb: Cache of the database structures
527 *
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 us
530 * the GUID of this disk. This function searches for the GUID in a linked
531 * list of vblk's.
532 *
533 * Return: Pointer, A matching vblk was found
534 * NULL, No match, or an error
535 */
536 static 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 device
553 * @pp: List of the partitions parsed so far
554 * @ldb: Cache of the database structures
555 *
556 * The database contains ALL the partitions for ALL disk groups, so we need to
557 * filter out this specific disk. Using the disk's object id, we can find all
558 * 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 partition
563 * objects in the linked list.
564 *
565 * Return: 'true' Partition created
566 * 'false' Error, probably a range checking problem
567 */
568 static 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 offset
607 * @buffer: Block of data being worked on
608 * @buflen: Size of the block of data
609 * @base: Size of the previous fixed width fields
610 * @offset: Cumulative size of the previous variable-width fields
611 *
612 * Because many of the VBLK fields are variable-width, it's necessary
613 * to calculate each offset based on the previous one and the length
614 * of the field it pointed to.
615 *
616 * Return: -1 Error, the calculated offset exceeded the size of the buffer
617 * n OK, a range-checked offset into buffer
618 */
619 static 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 order
642 * @block: Pointer to the variable-width number to convert
643 *
644 * Large numbers in the LDM Database are often stored in a packed format. Each
645 * number is prefixed by a one byte width marker. All numbers in the database
646 * are stored in big-endian byte order. This function reads one of these
647 * numbers and returns the result
648 *
649 * N.B. This function DOES NOT perform any range checking, though the most
650 * it will read is eight bytes.
651 *
652 * Return: n A number
653 * 0 Zero, or an error occurred
654 */
655 static 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 else
668 ldm_error ("Illegal length %d.", length);
669
670 return tmp;
671 }
672
673 /**
674 * ldm_get_vstr - Read a length-prefixed string into a buffer
675 * @block: Pointer to the length marker
676 * @buffer: Location to copy string to
677 * @buflen: Size of the output buffer
678 *
679 * Many of the strings in the LDM Database are not NULL terminated. Instead
680 * they are prefixed by a one byte length marker. This function copies one of
681 * 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 undefined
687 * n, String length in characters (excluding NULL)
688 * buflen-1, String was truncated.
689 */
690 static 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 structure
709 * @buffer: Block of data being worked on
710 * @buflen: Size of the block of data
711 * @vb: In-memory vblk in which to return information
712 *
713 * Read a raw VBLK Component object (version 3) into a vblk structure.
714 *
715 * Return: 'true' @vb contains a Component VBLK
716 * 'false' @vb contents are not defined
717 */
718 static 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 structure
759 * @buffer: Block of data being worked on
760 * @buflen: Size of the block of data
761 * @vb: In-memory vblk in which to return information
762 *
763 * Read a raw VBLK Disk Group object (version 3) into a vblk structure.
764 *
765 * Return: 'true' @vb contains a Disk Group VBLK
766 * 'false' @vb contents are not defined
767 */
768 static 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 } else
784 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 structure
800 * @buffer: Block of data being worked on
801 * @buflen: Size of the block of data
802 * @vb: In-memory vblk in which to return information
803 *
804 * Read a raw VBLK Disk Group object (version 4) into a vblk structure.
805 *
806 * Return: 'true' @vb contains a Disk Group VBLK
807 * 'false' @vb contents are not defined
808 */
809 static 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 } else
824 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 structure
838 * @buffer: Block of data being worked on
839 * @buflen: Size of the block of data
840 * @vb: In-memory vblk in which to return information
841 *
842 * Read a raw VBLK Disk object (version 3) into a vblk structure.
843 *
844 * Return: 'true' @vb contains a Disk VBLK
845 * 'false' @vb contents are not defined
846 */
847 static 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 structure
877 * @buffer: Block of data being worked on
878 * @buflen: Size of the block of data
879 * @vb: In-memory vblk in which to return information
880 *
881 * Read a raw VBLK Disk object (version 4) into a vblk structure.
882 *
883 * Return: 'true' @vb contains a Disk VBLK
884 * 'false' @vb contents are not defined
885 */
886 static 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 structure
910 * @buffer: Block of data being worked on
911 * @buflen: Size of the block of data
912 * @vb: In-memory vblk in which to return information
913 *
914 * Read a raw VBLK Partition object (version 3) into a vblk structure.
915 *
916 * Return: 'true' @vb contains a Partition VBLK
917 * 'false' @vb contents are not defined
918 */
919 static 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 } else
958 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 else
978 part->partnum = 0;
979 return true;
980 }
981
982 /**
983 * ldm_parse_vol5 - Read a raw VBLK Volume object into a vblk structure
984 * @buffer: Block of data being worked on
985 * @buflen: Size of the block of data
986 * @vb: In-memory vblk in which to return information
987 *
988 * Read a raw VBLK Volume object (version 5) into a vblk structure.
989 *
990 * Return: 'true' @vb contains a Volume VBLK
991 * 'false' @vb contents are not defined
992 */
993 static 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 } else
1038 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 } else
1046 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 } else
1054 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 } else
1062 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 structure
1091 * @buf: Block of data being worked on
1092 * @len: Size of the block of data
1093 * @vb: In-memory vblk in which to return information
1094 *
1095 * Read a raw VBLK object into a vblk structure. This function just reads the
1096 * information common to all VBLK types, then delegates the rest of the work to
1097 * helper functions: ldm_parse_*.
1098 *
1099 * Return: 'true' @vb contains a VBLK
1100 * 'false' @vb contents are not defined
1101 */
1102 static 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 else
1134 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 database
1143 * @data: Raw VBLK to add to the database
1144 * @len: Size of the raw VBLK
1145 * @ldb: Cache of the database structures
1146 *
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 added
1152 * 'false' An error occurred
1153 */
1154 static 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 list
1206 * @data: Raw fragment to be added to the list
1207 * @size: Size of the raw fragment
1208 * @frags: Linked list of VBLK fragments
1209 *
1210 * Fragmented VBLKs may not be consecutive in the database, so they are placed
1211 * in a list so they can be pieced together later.
1212 *
1213 * Return: 'true' Success, the VBLK was added to the list
1214 * 'false' Error, a problem occurred
1215 */
1216 static 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);
1259 found:
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 fragments
1280 * @list: Linked list of fragments
1281 *
1282 * Free a linked list of VBLK fragments
1283 *
1284 * Return: none
1285 */
1286 static 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 database
1298 * @frags: Linked list of VBLK fragments
1299 * @ldb: Cache of the database structures
1300 *
1301 * Now that all the fragmented VBLKs have been collected, they must be added to
1302 * the database for later use.
1303 *
1304 * Return: 'true' All the fragments we added successfully
1305 * 'false' One or more of the fragments we invalid
1306 */
1307 static 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 memory
1331 * @state: Partition check state including device holding the LDM Database
1332 * @base: Offset, into @state->disk, of the database
1333 * @ldb: Cache of the database structures
1334 *
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 successfully
1339 * 'false' An error occurred
1340 */
1341 static 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 */
1385 out:
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's
1395 * @lh: Head of a linked list of struct vblk
1396 *
1397 * Free a list of vblk's and free the memory used to maintain the list.
1398 *
1399 * Return: none
1400 */
1401 static 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 it
1414 * @state: Partition check state including device holding the LDM Database
1415 *
1416 * This determines whether the device @bdev is a dynamic disk and if so creates
1417 * 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 create
1420 * each partition described by the LDM database in sequence as devices 2+. For
1421 * 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 it
1425 * 0 Success, @state->disk is not a dynamic disk
1426 * -1 An error occurred before enough information had been read
1427 * Or @state->disk is a dynamic disk, but it may be corrupted
1428 */
1429 int 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
1478 cleanup:
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);
1484 out:
1485 kfree (ldb);
1486 return result;
1487 }
1488
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