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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/**
2 * ldm - Support for Windows Logical Disk Manager (Dynamic Disks)
3 *
4 * Copyright (C) 2001,2002 Richard Russon <ldm@flatcap.org>
5 * Copyright (c) 2001-2004 Anton Altaparmakov
6 * Copyright (C) 2001,2002 Jakob Kemi <jakob.kemi@telia.com>
7 *
8 * Documentation is available at http://linux-ntfs.sf.net/ldm
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
33typedef enum {
34 FALSE = 0,
35 TRUE = 1
36} BOOL;
37
38/**
39 * ldm_debug/info/error/crit - Output an error message
40 * @f: A printf format string containing the message
41 * @...: Variables to substitute into @f
42 *
43 * ldm_debug() writes a DEBUG level message to the syslog but only if the
44 * driver was compiled with debug enabled. Otherwise, the call turns into a NOP.
45 */
46#ifndef CONFIG_LDM_DEBUG
47#define ldm_debug(...) do {} while (0)
48#else
49#define ldm_debug(f, a...) _ldm_printk (KERN_DEBUG, __FUNCTION__, f, ##a)
50#endif
51
52#define ldm_crit(f, a...) _ldm_printk (KERN_CRIT, __FUNCTION__, f, ##a)
53#define ldm_error(f, a...) _ldm_printk (KERN_ERR, __FUNCTION__, f, ##a)
54#define ldm_info(f, a...) _ldm_printk (KERN_INFO, __FUNCTION__, f, ##a)
55
56__attribute__ ((format (printf, 3, 4)))
57static void _ldm_printk (const char *level, const char *function,
58 const char *fmt, ...)
59{
60 static char buf[128];
61 va_list args;
62
63 va_start (args, fmt);
64 vsnprintf (buf, sizeof (buf), fmt, args);
65 va_end (args);
66
67 printk ("%s%s(): %s\n", level, function, buf);
68}
69
70
71/**
72 * ldm_parse_hexbyte - Convert a ASCII hex number to a byte
73 * @src: Pointer to at least 2 characters to convert.
74 *
75 * Convert a two character ASCII hex string to a number.
76 *
77 * Return: 0-255 Success, the byte was parsed correctly
78 * -1 Error, an invalid character was supplied
79 */
80static int ldm_parse_hexbyte (const u8 *src)
81{
82 unsigned int x; /* For correct wrapping */
83 int h;
84
85 /* high part */
86 if ((x = src[0] - '0') <= '9'-'0') h = x;
87 else if ((x = src[0] - 'a') <= 'f'-'a') h = x+10;
88 else if ((x = src[0] - 'A') <= 'F'-'A') h = x+10;
89 else return -1;
90 h <<= 4;
91
92 /* low part */
93 if ((x = src[1] - '0') <= '9'-'0') return h | x;
94 if ((x = src[1] - 'a') <= 'f'-'a') return h | (x+10);
95 if ((x = src[1] - 'A') <= 'F'-'A') return h | (x+10);
96 return -1;
97}
98
99/**
100 * ldm_parse_guid - Convert GUID from ASCII to binary
101 * @src: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba
102 * @dest: Memory block to hold binary GUID (16 bytes)
103 *
104 * N.B. The GUID need not be NULL terminated.
105 *
106 * Return: TRUE @dest contains binary GUID
107 * FALSE @dest contents are undefined
108 */
109static BOOL ldm_parse_guid (const u8 *src, u8 *dest)
110{
111 static const int size[] = { 4, 2, 2, 2, 6 };
112 int i, j, v;
113
114 if (src[8] != '-' || src[13] != '-' ||
115 src[18] != '-' || src[23] != '-')
116 return FALSE;
117
118 for (j = 0; j < 5; j++, src++)
119 for (i = 0; i < size[j]; i++, src+=2, *dest++ = v)
120 if ((v = ldm_parse_hexbyte (src)) < 0)
121 return FALSE;
122
123 return TRUE;
124}
125
126
127/**
128 * ldm_parse_privhead - Read the LDM Database PRIVHEAD structure
129 * @data: Raw database PRIVHEAD structure loaded from the device
130 * @ph: In-memory privhead structure in which to return parsed information
131 *
132 * This parses the LDM database PRIVHEAD structure supplied in @data and
133 * sets up the in-memory privhead structure @ph with the obtained information.
134 *
135 * Return: TRUE @ph contains the PRIVHEAD data
136 * FALSE @ph contents are undefined
137 */
138static BOOL ldm_parse_privhead (const u8 *data, struct privhead *ph)
139{
140 BUG_ON (!data || !ph);
141
142 if (MAGIC_PRIVHEAD != BE64 (data)) {
143 ldm_error ("Cannot find PRIVHEAD structure. LDM database is"
144 " corrupt. Aborting.");
145 return FALSE;
146 }
147
148 ph->ver_major = BE16 (data + 0x000C);
149 ph->ver_minor = BE16 (data + 0x000E);
150 ph->logical_disk_start = BE64 (data + 0x011B);
151 ph->logical_disk_size = BE64 (data + 0x0123);
152 ph->config_start = BE64 (data + 0x012B);
153 ph->config_size = BE64 (data + 0x0133);
154
155 if ((ph->ver_major != 2) || (ph->ver_minor != 11)) {
156 ldm_error ("Expected PRIVHEAD version %d.%d, got %d.%d."
157 " Aborting.", 2, 11, ph->ver_major, ph->ver_minor);
158 return FALSE;
159 }
160 if (ph->config_size != LDM_DB_SIZE) { /* 1 MiB in sectors. */
161 /* Warn the user and continue, carefully */
162 ldm_info ("Database is normally %u bytes, it claims to "
163 "be %llu bytes.", LDM_DB_SIZE,
164 (unsigned long long)ph->config_size );
165 }
166 if ((ph->logical_disk_size == 0) ||
167 (ph->logical_disk_start + ph->logical_disk_size > ph->config_start)) {
168 ldm_error ("PRIVHEAD disk size doesn't match real disk size");
169 return FALSE;
170 }
171
172 if (!ldm_parse_guid (data + 0x0030, ph->disk_id)) {
173 ldm_error ("PRIVHEAD contains an invalid GUID.");
174 return FALSE;
175 }
176
177 ldm_debug ("Parsed PRIVHEAD successfully.");
178 return TRUE;
179}
180
181/**
182 * ldm_parse_tocblock - Read the LDM Database TOCBLOCK structure
183 * @data: Raw database TOCBLOCK structure loaded from the device
184 * @toc: In-memory toc structure in which to return parsed information
185 *
186 * This parses the LDM Database TOCBLOCK (table of contents) structure supplied
187 * in @data and sets up the in-memory tocblock structure @toc with the obtained
188 * information.
189 *
190 * N.B. The *_start and *_size values returned in @toc are not range-checked.
191 *
192 * Return: TRUE @toc contains the TOCBLOCK data
193 * FALSE @toc contents are undefined
194 */
195static BOOL ldm_parse_tocblock (const u8 *data, struct tocblock *toc)
196{
197 BUG_ON (!data || !toc);
198
199 if (MAGIC_TOCBLOCK != BE64 (data)) {
200 ldm_crit ("Cannot find TOCBLOCK, database may be corrupt.");
201 return FALSE;
202 }
203 strncpy (toc->bitmap1_name, data + 0x24, sizeof (toc->bitmap1_name));
204 toc->bitmap1_name[sizeof (toc->bitmap1_name) - 1] = 0;
205 toc->bitmap1_start = BE64 (data + 0x2E);
206 toc->bitmap1_size = BE64 (data + 0x36);
207
208 if (strncmp (toc->bitmap1_name, TOC_BITMAP1,
209 sizeof (toc->bitmap1_name)) != 0) {
210 ldm_crit ("TOCBLOCK's first bitmap is '%s', should be '%s'.",
211 TOC_BITMAP1, toc->bitmap1_name);
212 return FALSE;
213 }
214 strncpy (toc->bitmap2_name, data + 0x46, sizeof (toc->bitmap2_name));
215 toc->bitmap2_name[sizeof (toc->bitmap2_name) - 1] = 0;
216 toc->bitmap2_start = BE64 (data + 0x50);
217 toc->bitmap2_size = BE64 (data + 0x58);
218 if (strncmp (toc->bitmap2_name, TOC_BITMAP2,
219 sizeof (toc->bitmap2_name)) != 0) {
220 ldm_crit ("TOCBLOCK's second bitmap is '%s', should be '%s'.",
221 TOC_BITMAP2, toc->bitmap2_name);
222 return FALSE;
223 }
224 ldm_debug ("Parsed TOCBLOCK successfully.");
225 return TRUE;
226}
227
228/**
229 * ldm_parse_vmdb - Read the LDM Database VMDB structure
230 * @data: Raw database VMDB structure loaded from the device
231 * @vm: In-memory vmdb structure in which to return parsed information
232 *
233 * This parses the LDM Database VMDB structure supplied in @data and sets up
234 * the in-memory vmdb structure @vm with the obtained information.
235 *
236 * N.B. The *_start, *_size and *_seq values will be range-checked later.
237 *
238 * Return: TRUE @vm contains VMDB info
239 * FALSE @vm contents are undefined
240 */
241static BOOL ldm_parse_vmdb (const u8 *data, struct vmdb *vm)
242{
243 BUG_ON (!data || !vm);
244
245 if (MAGIC_VMDB != BE32 (data)) {
246 ldm_crit ("Cannot find the VMDB, database may be corrupt.");
247 return FALSE;
248 }
249
250 vm->ver_major = BE16 (data + 0x12);
251 vm->ver_minor = BE16 (data + 0x14);
252 if ((vm->ver_major != 4) || (vm->ver_minor != 10)) {
253 ldm_error ("Expected VMDB version %d.%d, got %d.%d. "
254 "Aborting.", 4, 10, vm->ver_major, vm->ver_minor);
255 return FALSE;
256 }
257
258 vm->vblk_size = BE32 (data + 0x08);
259 vm->vblk_offset = BE32 (data + 0x0C);
260 vm->last_vblk_seq = BE32 (data + 0x04);
261
262 ldm_debug ("Parsed VMDB successfully.");
263 return TRUE;
264}
265
266/**
267 * ldm_compare_privheads - Compare two privhead objects
268 * @ph1: First privhead
269 * @ph2: Second privhead
270 *
271 * This compares the two privhead structures @ph1 and @ph2.
272 *
273 * Return: TRUE Identical
274 * FALSE Different
275 */
276static BOOL ldm_compare_privheads (const struct privhead *ph1,
277 const struct privhead *ph2)
278{
279 BUG_ON (!ph1 || !ph2);
280
281 return ((ph1->ver_major == ph2->ver_major) &&
282 (ph1->ver_minor == ph2->ver_minor) &&
283 (ph1->logical_disk_start == ph2->logical_disk_start) &&
284 (ph1->logical_disk_size == ph2->logical_disk_size) &&
285 (ph1->config_start == ph2->config_start) &&
286 (ph1->config_size == ph2->config_size) &&
287 !memcmp (ph1->disk_id, ph2->disk_id, GUID_SIZE));
288}
289
290/**
291 * ldm_compare_tocblocks - Compare two tocblock objects
292 * @toc1: First toc
293 * @toc2: Second toc
294 *
295 * This compares the two tocblock structures @toc1 and @toc2.
296 *
297 * Return: TRUE Identical
298 * FALSE Different
299 */
300static BOOL ldm_compare_tocblocks (const struct tocblock *toc1,
301 const struct tocblock *toc2)
302{
303 BUG_ON (!toc1 || !toc2);
304
305 return ((toc1->bitmap1_start == toc2->bitmap1_start) &&
306 (toc1->bitmap1_size == toc2->bitmap1_size) &&
307 (toc1->bitmap2_start == toc2->bitmap2_start) &&
308 (toc1->bitmap2_size == toc2->bitmap2_size) &&
309 !strncmp (toc1->bitmap1_name, toc2->bitmap1_name,
310 sizeof (toc1->bitmap1_name)) &&
311 !strncmp (toc1->bitmap2_name, toc2->bitmap2_name,
312 sizeof (toc1->bitmap2_name)));
313}
314
315/**
316 * ldm_validate_privheads - Compare the primary privhead with its backups
317 * @bdev: Device holding the LDM Database
318 * @ph1: Memory struct to fill with ph contents
319 *
320 * Read and compare all three privheads from disk.
321 *
322 * The privheads on disk show the size and location of the main disk area and
323 * the configuration area (the database). The values are range-checked against
324 * @hd, which contains the real size of the disk.
325 *
326 * Return: TRUE Success
327 * FALSE Error
328 */
329static BOOL ldm_validate_privheads (struct block_device *bdev,
330 struct privhead *ph1)
331{
332 static const int off[3] = { OFF_PRIV1, OFF_PRIV2, OFF_PRIV3 };
333 struct privhead *ph[3] = { ph1 };
334 Sector sect;
335 u8 *data;
336 BOOL result = FALSE;
337 long num_sects;
338 int i;
339
340 BUG_ON (!bdev || !ph1);
341
342 ph[1] = kmalloc (sizeof (*ph[1]), GFP_KERNEL);
343 ph[2] = kmalloc (sizeof (*ph[2]), GFP_KERNEL);
344 if (!ph[1] || !ph[2]) {
345 ldm_crit ("Out of memory.");
346 goto out;
347 }
348
349 /* off[1 & 2] are relative to ph[0]->config_start */
350 ph[0]->config_start = 0;
351
352 /* Read and parse privheads */
353 for (i = 0; i < 3; i++) {
354 data = read_dev_sector (bdev,
355 ph[0]->config_start + off[i], &sect);
356 if (!data) {
357 ldm_crit ("Disk read failed.");
358 goto out;
359 }
360 result = ldm_parse_privhead (data, ph[i]);
361 put_dev_sector (sect);
362 if (!result) {
363 ldm_error ("Cannot find PRIVHEAD %d.", i+1); /* Log again */
364 if (i < 2)
365 goto out; /* Already logged */
366 else
367 break; /* FIXME ignore for now, 3rd PH can fail on odd-sized disks */
368 }
369 }
370
371 num_sects = bdev->bd_inode->i_size >> 9;
372
373 if ((ph[0]->config_start > num_sects) ||
374 ((ph[0]->config_start + ph[0]->config_size) > num_sects)) {
375 ldm_crit ("Database extends beyond the end of the disk.");
376 goto out;
377 }
378
379 if ((ph[0]->logical_disk_start > ph[0]->config_start) ||
380 ((ph[0]->logical_disk_start + ph[0]->logical_disk_size)
381 > ph[0]->config_start)) {
382 ldm_crit ("Disk and database overlap.");
383 goto out;
384 }
385
386 if (!ldm_compare_privheads (ph[0], ph[1])) {
387 ldm_crit ("Primary and backup PRIVHEADs don't match.");
388 goto out;
389 }
390 /* FIXME ignore this for now
391 if (!ldm_compare_privheads (ph[0], ph[2])) {
392 ldm_crit ("Primary and backup PRIVHEADs don't match.");
393 goto out;
394 }*/
395 ldm_debug ("Validated PRIVHEADs successfully.");
396 result = TRUE;
397out:
398 kfree (ph[1]);
399 kfree (ph[2]);
400 return result;
401}
402
403/**
404 * ldm_validate_tocblocks - Validate the table of contents and its backups
405 * @bdev: Device holding the LDM Database
406 * @base: Offset, into @bdev, of the database
407 * @ldb: Cache of the database structures
408 *
409 * Find and compare the four tables of contents of the LDM Database stored on
410 * @bdev and return the parsed information into @toc1.
411 *
412 * The offsets and sizes of the configs are range-checked against a privhead.
413 *
414 * Return: TRUE @toc1 contains validated TOCBLOCK info
415 * FALSE @toc1 contents are undefined
416 */
417static BOOL ldm_validate_tocblocks (struct block_device *bdev,
418 unsigned long base, struct ldmdb *ldb)
419{
420 static const int off[4] = { OFF_TOCB1, OFF_TOCB2, OFF_TOCB3, OFF_TOCB4};
421 struct tocblock *tb[4];
422 struct privhead *ph;
423 Sector sect;
424 u8 *data;
425 BOOL result = FALSE;
426 int i;
427
428 BUG_ON (!bdev || !ldb);
429
430 ph = &ldb->ph;
431 tb[0] = &ldb->toc;
432 tb[1] = kmalloc (sizeof (*tb[1]), GFP_KERNEL);
433 tb[2] = kmalloc (sizeof (*tb[2]), GFP_KERNEL);
434 tb[3] = kmalloc (sizeof (*tb[3]), GFP_KERNEL);
435 if (!tb[1] || !tb[2] || !tb[3]) {
436 ldm_crit ("Out of memory.");
437 goto out;
438 }
439
440 for (i = 0; i < 4; i++) /* Read and parse all four toc's. */
441 {
442 data = read_dev_sector (bdev, base + off[i], &sect);
443 if (!data) {
444 ldm_crit ("Disk read failed.");
445 goto out;
446 }
447 result = ldm_parse_tocblock (data, tb[i]);
448 put_dev_sector (sect);
449 if (!result)
450 goto out; /* Already logged */
451 }
452
453 /* Range check the toc against a privhead. */
454 if (((tb[0]->bitmap1_start + tb[0]->bitmap1_size) > ph->config_size) ||
455 ((tb[0]->bitmap2_start + tb[0]->bitmap2_size) > ph->config_size)) {
456 ldm_crit ("The bitmaps are out of range. Giving up.");
457 goto out;
458 }
459
460 if (!ldm_compare_tocblocks (tb[0], tb[1]) || /* Compare all tocs. */
461 !ldm_compare_tocblocks (tb[0], tb[2]) ||
462 !ldm_compare_tocblocks (tb[0], tb[3])) {
463 ldm_crit ("The TOCBLOCKs don't match.");
464 goto out;
465 }
466
467 ldm_debug ("Validated TOCBLOCKs successfully.");
468 result = TRUE;
469out:
470 kfree (tb[1]);
471 kfree (tb[2]);
472 kfree (tb[3]);
473 return result;
474}
475
476/**
477 * ldm_validate_vmdb - Read the VMDB and validate it
478 * @bdev: Device holding the LDM Database
479 * @base: Offset, into @bdev, of the database
480 * @ldb: Cache of the database structures
481 *
482 * Find the vmdb of the LDM Database stored on @bdev and return the parsed
483 * information in @ldb.
484 *
485 * Return: TRUE @ldb contains validated VBDB info
486 * FALSE @ldb contents are undefined
487 */
488static BOOL ldm_validate_vmdb (struct block_device *bdev, unsigned long base,
489 struct ldmdb *ldb)
490{
491 Sector sect;
492 u8 *data;
493 BOOL result = FALSE;
494 struct vmdb *vm;
495 struct tocblock *toc;
496
497 BUG_ON (!bdev || !ldb);
498
499 vm = &ldb->vm;
500 toc = &ldb->toc;
501
502 data = read_dev_sector (bdev, base + OFF_VMDB, &sect);
503 if (!data) {
504 ldm_crit ("Disk read failed.");
505 return FALSE;
506 }
507
508 if (!ldm_parse_vmdb (data, vm))
509 goto out; /* Already logged */
510
511 /* Are there uncommitted transactions? */
512 if (BE16(data + 0x10) != 0x01) {
513 ldm_crit ("Database is not in a consistent state. Aborting.");
514 goto out;
515 }
516
517 if (vm->vblk_offset != 512)
518 ldm_info ("VBLKs start at offset 0x%04x.", vm->vblk_offset);
519
520 /*
521 * The last_vblkd_seq can be before the end of the vmdb, just make sure
522 * it is not out of bounds.
523 */
524 if ((vm->vblk_size * vm->last_vblk_seq) > (toc->bitmap1_size << 9)) {
525 ldm_crit ("VMDB exceeds allowed size specified by TOCBLOCK. "
526 "Database is corrupt. Aborting.");
527 goto out;
528 }
529
530 result = TRUE;
531out:
532 put_dev_sector (sect);
533 return result;
534}
535
536
537/**
538 * ldm_validate_partition_table - Determine whether bdev might be a dynamic disk
539 * @bdev: Device holding the LDM Database
540 *
541 * This function provides a weak test to decide whether the device is a dynamic
542 * disk or not. It looks for an MS-DOS-style partition table containing at
543 * least one partition of type 0x42 (formerly SFS, now used by Windows for
544 * dynamic disks).
545 *
546 * N.B. The only possible error can come from the read_dev_sector and that is
547 * only likely to happen if the underlying device is strange. If that IS
548 * the case we should return zero to let someone else try.
549 *
550 * Return: TRUE @bdev is a dynamic disk
551 * FALSE @bdev is not a dynamic disk, or an error occurred
552 */
553static BOOL ldm_validate_partition_table (struct block_device *bdev)
554{
555 Sector sect;
556 u8 *data;
557 struct partition *p;
558 int i;
559 BOOL result = FALSE;
560
561 BUG_ON (!bdev);
562
563 data = read_dev_sector (bdev, 0, &sect);
564 if (!data) {
565 ldm_crit ("Disk read failed.");
566 return FALSE;
567 }
568
569 if (*(__le16*) (data + 0x01FE) != cpu_to_le16 (MSDOS_LABEL_MAGIC))
570 goto out;
571
572 p = (struct partition*)(data + 0x01BE);
573 for (i = 0; i < 4; i++, p++)
574 if (SYS_IND (p) == WIN2K_DYNAMIC_PARTITION) {
575 result = TRUE;
576 break;
577 }
578
579 if (result)
580 ldm_debug ("Found W2K dynamic disk partition type.");
581
582out:
583 put_dev_sector (sect);
584 return result;
585}
586
587/**
588 * ldm_get_disk_objid - Search a linked list of vblk's for a given Disk Id
589 * @ldb: Cache of the database structures
590 *
591 * The LDM Database contains a list of all partitions on all dynamic disks.
592 * The primary PRIVHEAD, at the beginning of the physical disk, tells us
593 * the GUID of this disk. This function searches for the GUID in a linked
594 * list of vblk's.
595 *
596 * Return: Pointer, A matching vblk was found
597 * NULL, No match, or an error
598 */
599static struct vblk * ldm_get_disk_objid (const struct ldmdb *ldb)
600{
601 struct list_head *item;
602
603 BUG_ON (!ldb);
604
605 list_for_each (item, &ldb->v_disk) {
606 struct vblk *v = list_entry (item, struct vblk, list);
607 if (!memcmp (v->vblk.disk.disk_id, ldb->ph.disk_id, GUID_SIZE))
608 return v;
609 }
610
611 return NULL;
612}
613
614/**
615 * ldm_create_data_partitions - Create data partitions for this device
616 * @pp: List of the partitions parsed so far
617 * @ldb: Cache of the database structures
618 *
619 * The database contains ALL the partitions for ALL disk groups, so we need to
620 * filter out this specific disk. Using the disk's object id, we can find all
621 * the partitions in the database that belong to this disk.
622 *
623 * Add each partition in our database, to the parsed_partitions structure.
624 *
625 * N.B. This function creates the partitions in the order it finds partition
626 * objects in the linked list.
627 *
628 * Return: TRUE Partition created
629 * FALSE Error, probably a range checking problem
630 */
631static BOOL ldm_create_data_partitions (struct parsed_partitions *pp,
632 const struct ldmdb *ldb)
633{
634 struct list_head *item;
635 struct vblk *vb;
636 struct vblk *disk;
637 struct vblk_part *part;
638 int part_num = 1;
639
640 BUG_ON (!pp || !ldb);
641
642 disk = ldm_get_disk_objid (ldb);
643 if (!disk) {
644 ldm_crit ("Can't find the ID of this disk in the database.");
645 return FALSE;
646 }
647
648 printk (" [LDM]");
649
650 /* Create the data partitions */
651 list_for_each (item, &ldb->v_part) {
652 vb = list_entry (item, struct vblk, list);
653 part = &vb->vblk.part;
654
655 if (part->disk_id != disk->obj_id)
656 continue;
657
658 put_partition (pp, part_num, ldb->ph.logical_disk_start +
659 part->start, part->size);
660 part_num++;
661 }
662
663 printk ("\n");
664 return TRUE;
665}
666
667
668/**
669 * ldm_relative - Calculate the next relative offset
670 * @buffer: Block of data being worked on
671 * @buflen: Size of the block of data
672 * @base: Size of the previous fixed width fields
673 * @offset: Cumulative size of the previous variable-width fields
674 *
675 * Because many of the VBLK fields are variable-width, it's necessary
676 * to calculate each offset based on the previous one and the length
677 * of the field it pointed to.
678 *
679 * Return: -1 Error, the calculated offset exceeded the size of the buffer
680 * n OK, a range-checked offset into buffer
681 */
682static int ldm_relative (const u8 *buffer, int buflen, int base, int offset)
683{
684
685 base += offset;
686 if ((!buffer) || (offset < 0) || (base > buflen))
687 return -1;
688 if ((base + buffer[base]) >= buflen)
689 return -1;
690
691 return buffer[base] + offset + 1;
692}
693
694/**
695 * ldm_get_vnum - Convert a variable-width, big endian number, into cpu order
696 * @block: Pointer to the variable-width number to convert
697 *
698 * Large numbers in the LDM Database are often stored in a packed format. Each
699 * number is prefixed by a one byte width marker. All numbers in the database
700 * are stored in big-endian byte order. This function reads one of these
701 * numbers and returns the result
702 *
703 * N.B. This function DOES NOT perform any range checking, though the most
704 * it will read is eight bytes.
705 *
706 * Return: n A number
707 * 0 Zero, or an error occurred
708 */
709static u64 ldm_get_vnum (const u8 *block)
710{
711 u64 tmp = 0;
712 u8 length;
713
714 BUG_ON (!block);
715
716 length = *block++;
717
718 if (length && length <= 8)
719 while (length--)
720 tmp = (tmp << 8) | *block++;
721 else
722 ldm_error ("Illegal length %d.", length);
723
724 return tmp;
725}
726
727/**
728 * ldm_get_vstr - Read a length-prefixed string into a buffer
729 * @block: Pointer to the length marker
730 * @buffer: Location to copy string to
731 * @buflen: Size of the output buffer
732 *
733 * Many of the strings in the LDM Database are not NULL terminated. Instead
734 * they are prefixed by a one byte length marker. This function copies one of
735 * these strings into a buffer.
736 *
737 * N.B. This function DOES NOT perform any range checking on the input.
738 * If the buffer is too small, the output will be truncated.
739 *
740 * Return: 0, Error and @buffer contents are undefined
741 * n, String length in characters (excluding NULL)
742 * buflen-1, String was truncated.
743 */
744static int ldm_get_vstr (const u8 *block, u8 *buffer, int buflen)
745{
746 int length;
747
748 BUG_ON (!block || !buffer);
749
750 length = block[0];
751 if (length >= buflen) {
752 ldm_error ("Truncating string %d -> %d.", length, buflen);
753 length = buflen - 1;
754 }
755 memcpy (buffer, block + 1, length);
756 buffer[length] = 0;
757 return length;
758}
759
760
761/**
762 * ldm_parse_cmp3 - Read a raw VBLK Component object into a vblk structure
763 * @buffer: Block of data being worked on
764 * @buflen: Size of the block of data
765 * @vb: In-memory vblk in which to return information
766 *
767 * Read a raw VBLK Component object (version 3) into a vblk structure.
768 *
769 * Return: TRUE @vb contains a Component VBLK
770 * FALSE @vb contents are not defined
771 */
772static BOOL ldm_parse_cmp3 (const u8 *buffer, int buflen, struct vblk *vb)
773{
774 int r_objid, r_name, r_vstate, r_child, r_parent, r_stripe, r_cols, len;
775 struct vblk_comp *comp;
776
777 BUG_ON (!buffer || !vb);
778
779 r_objid = ldm_relative (buffer, buflen, 0x18, 0);
780 r_name = ldm_relative (buffer, buflen, 0x18, r_objid);
781 r_vstate = ldm_relative (buffer, buflen, 0x18, r_name);
782 r_child = ldm_relative (buffer, buflen, 0x1D, r_vstate);
783 r_parent = ldm_relative (buffer, buflen, 0x2D, r_child);
784
785 if (buffer[0x12] & VBLK_FLAG_COMP_STRIPE) {
786 r_stripe = ldm_relative (buffer, buflen, 0x2E, r_parent);
787 r_cols = ldm_relative (buffer, buflen, 0x2E, r_stripe);
788 len = r_cols;
789 } else {
790 r_stripe = 0;
791 r_cols = 0;
792 len = r_parent;
793 }
794 if (len < 0)
795 return FALSE;
796
797 len += VBLK_SIZE_CMP3;
798 if (len != BE32 (buffer + 0x14))
799 return FALSE;
800
801 comp = &vb->vblk.comp;
802 ldm_get_vstr (buffer + 0x18 + r_name, comp->state,
803 sizeof (comp->state));
804 comp->type = buffer[0x18 + r_vstate];
805 comp->children = ldm_get_vnum (buffer + 0x1D + r_vstate);
806 comp->parent_id = ldm_get_vnum (buffer + 0x2D + r_child);
807 comp->chunksize = r_stripe ? ldm_get_vnum (buffer+r_parent+0x2E) : 0;
808
809 return TRUE;
810}
811
812/**
813 * ldm_parse_dgr3 - Read a raw VBLK Disk Group object into a vblk structure
814 * @buffer: Block of data being worked on
815 * @buflen: Size of the block of data
816 * @vb: In-memory vblk in which to return information
817 *
818 * Read a raw VBLK Disk Group object (version 3) into a vblk structure.
819 *
820 * Return: TRUE @vb contains a Disk Group VBLK
821 * FALSE @vb contents are not defined
822 */
823static int ldm_parse_dgr3 (const u8 *buffer, int buflen, struct vblk *vb)
824{
825 int r_objid, r_name, r_diskid, r_id1, r_id2, len;
826 struct vblk_dgrp *dgrp;
827
828 BUG_ON (!buffer || !vb);
829
830 r_objid = ldm_relative (buffer, buflen, 0x18, 0);
831 r_name = ldm_relative (buffer, buflen, 0x18, r_objid);
832 r_diskid = ldm_relative (buffer, buflen, 0x18, r_name);
833
834 if (buffer[0x12] & VBLK_FLAG_DGR3_IDS) {
835 r_id1 = ldm_relative (buffer, buflen, 0x24, r_diskid);
836 r_id2 = ldm_relative (buffer, buflen, 0x24, r_id1);
837 len = r_id2;
838 } else {
839 r_id1 = 0;
840 r_id2 = 0;
841 len = r_diskid;
842 }
843 if (len < 0)
844 return FALSE;
845
846 len += VBLK_SIZE_DGR3;
847 if (len != BE32 (buffer + 0x14))
848 return FALSE;
849
850 dgrp = &vb->vblk.dgrp;
851 ldm_get_vstr (buffer + 0x18 + r_name, dgrp->disk_id,
852 sizeof (dgrp->disk_id));
853 return TRUE;
854}
855
856/**
857 * ldm_parse_dgr4 - Read a raw VBLK Disk Group object into a vblk structure
858 * @buffer: Block of data being worked on
859 * @buflen: Size of the block of data
860 * @vb: In-memory vblk in which to return information
861 *
862 * Read a raw VBLK Disk Group object (version 4) into a vblk structure.
863 *
864 * Return: TRUE @vb contains a Disk Group VBLK
865 * FALSE @vb contents are not defined
866 */
867static BOOL ldm_parse_dgr4 (const u8 *buffer, int buflen, struct vblk *vb)
868{
869 char buf[64];
870 int r_objid, r_name, r_id1, r_id2, len;
871 struct vblk_dgrp *dgrp;
872
873 BUG_ON (!buffer || !vb);
874
875 r_objid = ldm_relative (buffer, buflen, 0x18, 0);
876 r_name = ldm_relative (buffer, buflen, 0x18, r_objid);
877
878 if (buffer[0x12] & VBLK_FLAG_DGR4_IDS) {
879 r_id1 = ldm_relative (buffer, buflen, 0x44, r_name);
880 r_id2 = ldm_relative (buffer, buflen, 0x44, r_id1);
881 len = r_id2;
882 } else {
883 r_id1 = 0;
884 r_id2 = 0;
885 len = r_name;
886 }
887 if (len < 0)
888 return FALSE;
889
890 len += VBLK_SIZE_DGR4;
891 if (len != BE32 (buffer + 0x14))
892 return FALSE;
893
894 dgrp = &vb->vblk.dgrp;
895
896 ldm_get_vstr (buffer + 0x18 + r_objid, buf, sizeof (buf));
897 return TRUE;
898}
899
900/**
901 * ldm_parse_dsk3 - Read a raw VBLK Disk object into a vblk structure
902 * @buffer: Block of data being worked on
903 * @buflen: Size of the block of data
904 * @vb: In-memory vblk in which to return information
905 *
906 * Read a raw VBLK Disk object (version 3) into a vblk structure.
907 *
908 * Return: TRUE @vb contains a Disk VBLK
909 * FALSE @vb contents are not defined
910 */
911static BOOL ldm_parse_dsk3 (const u8 *buffer, int buflen, struct vblk *vb)
912{
913 int r_objid, r_name, r_diskid, r_altname, len;
914 struct vblk_disk *disk;
915
916 BUG_ON (!buffer || !vb);
917
918 r_objid = ldm_relative (buffer, buflen, 0x18, 0);
919 r_name = ldm_relative (buffer, buflen, 0x18, r_objid);
920 r_diskid = ldm_relative (buffer, buflen, 0x18, r_name);
921 r_altname = ldm_relative (buffer, buflen, 0x18, r_diskid);
922 len = r_altname;
923 if (len < 0)
924 return FALSE;
925
926 len += VBLK_SIZE_DSK3;
927 if (len != BE32 (buffer + 0x14))
928 return FALSE;
929
930 disk = &vb->vblk.disk;
931 ldm_get_vstr (buffer + 0x18 + r_diskid, disk->alt_name,
932 sizeof (disk->alt_name));
933 if (!ldm_parse_guid (buffer + 0x19 + r_name, disk->disk_id))
934 return FALSE;
935
936 return TRUE;
937}
938
939/**
940 * ldm_parse_dsk4 - Read a raw VBLK Disk object into a vblk structure
941 * @buffer: Block of data being worked on
942 * @buflen: Size of the block of data
943 * @vb: In-memory vblk in which to return information
944 *
945 * Read a raw VBLK Disk object (version 4) into a vblk structure.
946 *
947 * Return: TRUE @vb contains a Disk VBLK
948 * FALSE @vb contents are not defined
949 */
950static BOOL ldm_parse_dsk4 (const u8 *buffer, int buflen, struct vblk *vb)
951{
952 int r_objid, r_name, len;
953 struct vblk_disk *disk;
954
955 BUG_ON (!buffer || !vb);
956
957 r_objid = ldm_relative (buffer, buflen, 0x18, 0);
958 r_name = ldm_relative (buffer, buflen, 0x18, r_objid);
959 len = r_name;
960 if (len < 0)
961 return FALSE;
962
963 len += VBLK_SIZE_DSK4;
964 if (len != BE32 (buffer + 0x14))
965 return FALSE;
966
967 disk = &vb->vblk.disk;
968 memcpy (disk->disk_id, buffer + 0x18 + r_name, GUID_SIZE);
969 return TRUE;
970}
971
972/**
973 * ldm_parse_prt3 - Read a raw VBLK Partition object into a vblk structure
974 * @buffer: Block of data being worked on
975 * @buflen: Size of the block of data
976 * @vb: In-memory vblk in which to return information
977 *
978 * Read a raw VBLK Partition object (version 3) into a vblk structure.
979 *
980 * Return: TRUE @vb contains a Partition VBLK
981 * FALSE @vb contents are not defined
982 */
983static BOOL ldm_parse_prt3 (const u8 *buffer, int buflen, struct vblk *vb)
984{
985 int r_objid, r_name, r_size, r_parent, r_diskid, r_index, len;
986 struct vblk_part *part;
987
988 BUG_ON (!buffer || !vb);
989
990 r_objid = ldm_relative (buffer, buflen, 0x18, 0);
991 r_name = ldm_relative (buffer, buflen, 0x18, r_objid);
992 r_size = ldm_relative (buffer, buflen, 0x34, r_name);
993 r_parent = ldm_relative (buffer, buflen, 0x34, r_size);
994 r_diskid = ldm_relative (buffer, buflen, 0x34, r_parent);
995
996 if (buffer[0x12] & VBLK_FLAG_PART_INDEX) {
997 r_index = ldm_relative (buffer, buflen, 0x34, r_diskid);
998 len = r_index;
999 } else {
1000 r_index = 0;
1001 len = r_diskid;
1002 }
1003 if (len < 0)
1004 return FALSE;
1005
1006 len += VBLK_SIZE_PRT3;
1007 if (len != BE32 (buffer + 0x14))
1008 return FALSE;
1009
1010 part = &vb->vblk.part;
1011 part->start = BE64 (buffer + 0x24 + r_name);
1012 part->volume_offset = BE64 (buffer + 0x2C + r_name);
1013 part->size = ldm_get_vnum (buffer + 0x34 + r_name);
1014 part->parent_id = ldm_get_vnum (buffer + 0x34 + r_size);
1015 part->disk_id = ldm_get_vnum (buffer + 0x34 + r_parent);
1016 if (vb->flags & VBLK_FLAG_PART_INDEX)
1017 part->partnum = buffer[0x35 + r_diskid];
1018 else
1019 part->partnum = 0;
1020
1021 return TRUE;
1022}
1023
1024/**
1025 * ldm_parse_vol5 - Read a raw VBLK Volume object into a vblk structure
1026 * @buffer: Block of data being worked on
1027 * @buflen: Size of the block of data
1028 * @vb: In-memory vblk in which to return information
1029 *
1030 * Read a raw VBLK Volume object (version 5) into a vblk structure.
1031 *
1032 * Return: TRUE @vb contains a Volume VBLK
1033 * FALSE @vb contents are not defined
1034 */
1035static BOOL ldm_parse_vol5 (const u8 *buffer, int buflen, struct vblk *vb)
1036{
1037 int r_objid, r_name, r_vtype, r_child, r_size, r_id1, r_id2, r_size2;
1038 int r_drive, len;
1039 struct vblk_volu *volu;
1040
1041 BUG_ON (!buffer || !vb);
1042
1043 r_objid = ldm_relative (buffer, buflen, 0x18, 0);
1044 r_name = ldm_relative (buffer, buflen, 0x18, r_objid);
1045 r_vtype = ldm_relative (buffer, buflen, 0x18, r_name);
1046 r_child = ldm_relative (buffer, buflen, 0x2E, r_vtype);
1047 r_size = ldm_relative (buffer, buflen, 0x3E, r_child);
1048
1049 if (buffer[0x12] & VBLK_FLAG_VOLU_ID1)
1050 r_id1 = ldm_relative (buffer, buflen, 0x53, r_size);
1051 else
1052 r_id1 = r_size;
1053
1054 if (buffer[0x12] & VBLK_FLAG_VOLU_ID2)
1055 r_id2 = ldm_relative (buffer, buflen, 0x53, r_id1);
1056 else
1057 r_id2 = r_id1;
1058
1059 if (buffer[0x12] & VBLK_FLAG_VOLU_SIZE)
1060 r_size2 = ldm_relative (buffer, buflen, 0x53, r_id2);
1061 else
1062 r_size2 = r_id2;
1063
1064 if (buffer[0x12] & VBLK_FLAG_VOLU_DRIVE)
1065 r_drive = ldm_relative (buffer, buflen, 0x53, r_size2);
1066 else
1067 r_drive = r_size2;
1068
1069 len = r_drive;
1070 if (len < 0)
1071 return FALSE;
1072
1073 len += VBLK_SIZE_VOL5;
1074 if (len != BE32 (buffer + 0x14))
1075 return FALSE;
1076
1077 volu = &vb->vblk.volu;
1078
1079 ldm_get_vstr (buffer + 0x18 + r_name, volu->volume_type,
1080 sizeof (volu->volume_type));
1081 memcpy (volu->volume_state, buffer + 0x19 + r_vtype,
1082 sizeof (volu->volume_state));
1083 volu->size = ldm_get_vnum (buffer + 0x3E + r_child);
1084 volu->partition_type = buffer[0x42 + r_size];
1085 memcpy (volu->guid, buffer + 0x43 + r_size, sizeof (volu->guid));
1086 if (buffer[0x12] & VBLK_FLAG_VOLU_DRIVE) {
1087 ldm_get_vstr (buffer + 0x53 + r_size, volu->drive_hint,
1088 sizeof (volu->drive_hint));
1089 }
1090 return TRUE;
1091}
1092
1093/**
1094 * ldm_parse_vblk - Read a raw VBLK object into a vblk structure
1095 * @buf: Block of data being worked on
1096 * @len: Size of the block of data
1097 * @vb: In-memory vblk in which to return information
1098 *
1099 * Read a raw VBLK object into a vblk structure. This function just reads the
1100 * information common to all VBLK types, then delegates the rest of the work to
1101 * helper functions: ldm_parse_*.
1102 *
1103 * Return: TRUE @vb contains a VBLK
1104 * FALSE @vb contents are not defined
1105 */
1106static BOOL ldm_parse_vblk (const u8 *buf, int len, struct vblk *vb)
1107{
1108 BOOL result = FALSE;
1109 int r_objid;
1110
1111 BUG_ON (!buf || !vb);
1112
1113 r_objid = ldm_relative (buf, len, 0x18, 0);
1114 if (r_objid < 0) {
1115 ldm_error ("VBLK header is corrupt.");
1116 return FALSE;
1117 }
1118
1119 vb->flags = buf[0x12];
1120 vb->type = buf[0x13];
1121 vb->obj_id = ldm_get_vnum (buf + 0x18);
1122 ldm_get_vstr (buf+0x18+r_objid, vb->name, sizeof (vb->name));
1123
1124 switch (vb->type) {
1125 case VBLK_CMP3: result = ldm_parse_cmp3 (buf, len, vb); break;
1126 case VBLK_DSK3: result = ldm_parse_dsk3 (buf, len, vb); break;
1127 case VBLK_DSK4: result = ldm_parse_dsk4 (buf, len, vb); break;
1128 case VBLK_DGR3: result = ldm_parse_dgr3 (buf, len, vb); break;
1129 case VBLK_DGR4: result = ldm_parse_dgr4 (buf, len, vb); break;
1130 case VBLK_PRT3: result = ldm_parse_prt3 (buf, len, vb); break;
1131 case VBLK_VOL5: result = ldm_parse_vol5 (buf, len, vb); break;
1132 }
1133
1134 if (result)
1135 ldm_debug ("Parsed VBLK 0x%llx (type: 0x%02x) ok.",
1136 (unsigned long long) vb->obj_id, vb->type);
1137 else
1138 ldm_error ("Failed to parse VBLK 0x%llx (type: 0x%02x).",
1139 (unsigned long long) vb->obj_id, vb->type);
1140
1141 return result;
1142}
1143
1144
1145/**
1146 * ldm_ldmdb_add - Adds a raw VBLK entry to the ldmdb database
1147 * @data: Raw VBLK to add to the database
1148 * @len: Size of the raw VBLK
1149 * @ldb: Cache of the database structures
1150 *
1151 * The VBLKs are sorted into categories. Partitions are also sorted by offset.
1152 *
1153 * N.B. This function does not check the validity of the VBLKs.
1154 *
1155 * Return: TRUE The VBLK was added
1156 * FALSE An error occurred
1157 */
1158static BOOL ldm_ldmdb_add (u8 *data, int len, struct ldmdb *ldb)
1159{
1160 struct vblk *vb;
1161 struct list_head *item;
1162
1163 BUG_ON (!data || !ldb);
1164
1165 vb = kmalloc (sizeof (*vb), GFP_KERNEL);
1166 if (!vb) {
1167 ldm_crit ("Out of memory.");
1168 return FALSE;
1169 }
1170
1171 if (!ldm_parse_vblk (data, len, vb)) {
1172 kfree(vb);
1173 return FALSE; /* Already logged */
1174 }
1175
1176 /* Put vblk into the correct list. */
1177 switch (vb->type) {
1178 case VBLK_DGR3:
1179 case VBLK_DGR4:
1180 list_add (&vb->list, &ldb->v_dgrp);
1181 break;
1182 case VBLK_DSK3:
1183 case VBLK_DSK4:
1184 list_add (&vb->list, &ldb->v_disk);
1185 break;
1186 case VBLK_VOL5:
1187 list_add (&vb->list, &ldb->v_volu);
1188 break;
1189 case VBLK_CMP3:
1190 list_add (&vb->list, &ldb->v_comp);
1191 break;
1192 case VBLK_PRT3:
1193 /* Sort by the partition's start sector. */
1194 list_for_each (item, &ldb->v_part) {
1195 struct vblk *v = list_entry (item, struct vblk, list);
1196 if ((v->vblk.part.disk_id == vb->vblk.part.disk_id) &&
1197 (v->vblk.part.start > vb->vblk.part.start)) {
1198 list_add_tail (&vb->list, &v->list);
1199 return TRUE;
1200 }
1201 }
1202 list_add_tail (&vb->list, &ldb->v_part);
1203 break;
1204 }
1205 return TRUE;
1206}
1207
1208/**
1209 * ldm_frag_add - Add a VBLK fragment to a list
1210 * @data: Raw fragment to be added to the list
1211 * @size: Size of the raw fragment
1212 * @frags: Linked list of VBLK fragments
1213 *
1214 * Fragmented VBLKs may not be consecutive in the database, so they are placed
1215 * in a list so they can be pieced together later.
1216 *
1217 * Return: TRUE Success, the VBLK was added to the list
1218 * FALSE Error, a problem occurred
1219 */
1220static BOOL ldm_frag_add (const u8 *data, int size, struct list_head *frags)
1221{
1222 struct frag *f;
1223 struct list_head *item;
1224 int rec, num, group;
1225
1226 BUG_ON (!data || !frags);
1227
1228 group = BE32 (data + 0x08);
1229 rec = BE16 (data + 0x0C);
1230 num = BE16 (data + 0x0E);
1231 if ((num < 1) || (num > 4)) {
1232 ldm_error ("A VBLK claims to have %d parts.", num);
1233 return FALSE;
1234 }
1235
1236 list_for_each (item, frags) {
1237 f = list_entry (item, struct frag, list);
1238 if (f->group == group)
1239 goto found;
1240 }
1241
1242 f = kmalloc (sizeof (*f) + size*num, GFP_KERNEL);
1243 if (!f) {
1244 ldm_crit ("Out of memory.");
1245 return FALSE;
1246 }
1247
1248 f->group = group;
1249 f->num = num;
1250 f->rec = rec;
1251 f->map = 0xFF << num;
1252
1253 list_add_tail (&f->list, frags);
1254found:
1255 if (f->map & (1 << rec)) {
1256 ldm_error ("Duplicate VBLK, part %d.", rec);
1257 f->map &= 0x7F; /* Mark the group as broken */
1258 return FALSE;
1259 }
1260
1261 f->map |= (1 << rec);
1262
1263 if (num > 0) {
1264 data += VBLK_SIZE_HEAD;
1265 size -= VBLK_SIZE_HEAD;
1266 }
1267 memcpy (f->data+rec*(size-VBLK_SIZE_HEAD)+VBLK_SIZE_HEAD, data, size);
1268
1269 return TRUE;
1270}
1271
1272/**
1273 * ldm_frag_free - Free a linked list of VBLK fragments
1274 * @list: Linked list of fragments
1275 *
1276 * Free a linked list of VBLK fragments
1277 *
1278 * Return: none
1279 */
1280static void ldm_frag_free (struct list_head *list)
1281{
1282 struct list_head *item, *tmp;
1283
1284 BUG_ON (!list);
1285
1286 list_for_each_safe (item, tmp, list)
1287 kfree (list_entry (item, struct frag, list));
1288}
1289
1290/**
1291 * ldm_frag_commit - Validate fragmented VBLKs and add them to the database
1292 * @frags: Linked list of VBLK fragments
1293 * @ldb: Cache of the database structures
1294 *
1295 * Now that all the fragmented VBLKs have been collected, they must be added to
1296 * the database for later use.
1297 *
1298 * Return: TRUE All the fragments we added successfully
1299 * FALSE One or more of the fragments we invalid
1300 */
1301static BOOL ldm_frag_commit (struct list_head *frags, struct ldmdb *ldb)
1302{
1303 struct frag *f;
1304 struct list_head *item;
1305
1306 BUG_ON (!frags || !ldb);
1307
1308 list_for_each (item, frags) {
1309 f = list_entry (item, struct frag, list);
1310
1311 if (f->map != 0xFF) {
1312 ldm_error ("VBLK group %d is incomplete (0x%02x).",
1313 f->group, f->map);
1314 return FALSE;
1315 }
1316
1317 if (!ldm_ldmdb_add (f->data, f->num*ldb->vm.vblk_size, ldb))
1318 return FALSE; /* Already logged */
1319 }
1320 return TRUE;
1321}
1322
1323/**
1324 * ldm_get_vblks - Read the on-disk database of VBLKs into memory
1325 * @bdev: Device holding the LDM Database
1326 * @base: Offset, into @bdev, of the database
1327 * @ldb: Cache of the database structures
1328 *
1329 * To use the information from the VBLKs, they need to be read from the disk,
1330 * unpacked and validated. We cache them in @ldb according to their type.
1331 *
1332 * Return: TRUE All the VBLKs were read successfully
1333 * FALSE An error occurred
1334 */
1335static BOOL ldm_get_vblks (struct block_device *bdev, unsigned long base,
1336 struct ldmdb *ldb)
1337{
1338 int size, perbuf, skip, finish, s, v, recs;
1339 u8 *data = NULL;
1340 Sector sect;
1341 BOOL result = FALSE;
1342 LIST_HEAD (frags);
1343
1344 BUG_ON (!bdev || !ldb);
1345
1346 size = ldb->vm.vblk_size;
1347 perbuf = 512 / size;
1348 skip = ldb->vm.vblk_offset >> 9; /* Bytes to sectors */
1349 finish = (size * ldb->vm.last_vblk_seq) >> 9;
1350
1351 for (s = skip; s < finish; s++) { /* For each sector */
1352 data = read_dev_sector (bdev, base + OFF_VMDB + s, &sect);
1353 if (!data) {
1354 ldm_crit ("Disk read failed.");
1355 goto out;
1356 }
1357
1358 for (v = 0; v < perbuf; v++, data+=size) { /* For each vblk */
1359 if (MAGIC_VBLK != BE32 (data)) {
1360 ldm_error ("Expected to find a VBLK.");
1361 goto out;
1362 }
1363
1364 recs = BE16 (data + 0x0E); /* Number of records */
1365 if (recs == 1) {
1366 if (!ldm_ldmdb_add (data, size, ldb))
1367 goto out; /* Already logged */
1368 } else if (recs > 1) {
1369 if (!ldm_frag_add (data, size, &frags))
1370 goto out; /* Already logged */
1371 }
1372 /* else Record is not in use, ignore it. */
1373 }
1374 put_dev_sector (sect);
1375 data = NULL;
1376 }
1377
1378 result = ldm_frag_commit (&frags, ldb); /* Failures, already logged */
1379out:
1380 if (data)
1381 put_dev_sector (sect);
1382 ldm_frag_free (&frags);
1383
1384 return result;
1385}
1386
1387/**
1388 * ldm_free_vblks - Free a linked list of vblk's
1389 * @lh: Head of a linked list of struct vblk
1390 *
1391 * Free a list of vblk's and free the memory used to maintain the list.
1392 *
1393 * Return: none
1394 */
1395static void ldm_free_vblks (struct list_head *lh)
1396{
1397 struct list_head *item, *tmp;
1398
1399 BUG_ON (!lh);
1400
1401 list_for_each_safe (item, tmp, lh)
1402 kfree (list_entry (item, struct vblk, list));
1403}
1404
1405
1406/**
1407 * ldm_partition - Find out whether a device is a dynamic disk and handle it
1408 * @pp: List of the partitions parsed so far
1409 * @bdev: Device holding the LDM Database
1410 *
1411 * This determines whether the device @bdev is a dynamic disk and if so creates
1412 * the partitions necessary in the gendisk structure pointed to by @hd.
1413 *
1414 * We create a dummy device 1, which contains the LDM database, and then create
1415 * each partition described by the LDM database in sequence as devices 2+. For
1416 * example, if the device is hda, we would have: hda1: LDM database, hda2, hda3,
1417 * and so on: the actual data containing partitions.
1418 *
1419 * Return: 1 Success, @bdev is a dynamic disk and we handled it
1420 * 0 Success, @bdev is not a dynamic disk
1421 * -1 An error occurred before enough information had been read
1422 * Or @bdev is a dynamic disk, but it may be corrupted
1423 */
1424int ldm_partition (struct parsed_partitions *pp, struct block_device *bdev)
1425{
1426 struct ldmdb *ldb;
1427 unsigned long base;
1428 int result = -1;
1429
1430 BUG_ON (!pp || !bdev);
1431
1432 /* Look for signs of a Dynamic Disk */
1433 if (!ldm_validate_partition_table (bdev))
1434 return 0;
1435
1436 ldb = kmalloc (sizeof (*ldb), GFP_KERNEL);
1437 if (!ldb) {
1438 ldm_crit ("Out of memory.");
1439 goto out;
1440 }
1441
1442 /* Parse and check privheads. */
1443 if (!ldm_validate_privheads (bdev, &ldb->ph))
1444 goto out; /* Already logged */
1445
1446 /* All further references are relative to base (database start). */
1447 base = ldb->ph.config_start;
1448
1449 /* Parse and check tocs and vmdb. */
1450 if (!ldm_validate_tocblocks (bdev, base, ldb) ||
1451 !ldm_validate_vmdb (bdev, base, ldb))
1452 goto out; /* Already logged */
1453
1454 /* Initialize vblk lists in ldmdb struct */
1455 INIT_LIST_HEAD (&ldb->v_dgrp);
1456 INIT_LIST_HEAD (&ldb->v_disk);
1457 INIT_LIST_HEAD (&ldb->v_volu);
1458 INIT_LIST_HEAD (&ldb->v_comp);
1459 INIT_LIST_HEAD (&ldb->v_part);
1460
1461 if (!ldm_get_vblks (bdev, base, ldb)) {
1462 ldm_crit ("Failed to read the VBLKs from the database.");
1463 goto cleanup;
1464 }
1465
1466 /* Finally, create the data partition devices. */
1467 if (ldm_create_data_partitions (pp, ldb)) {
1468 ldm_debug ("Parsed LDM database successfully.");
1469 result = 1;
1470 }
1471 /* else Already logged */
1472
1473cleanup:
1474 ldm_free_vblks (&ldb->v_dgrp);
1475 ldm_free_vblks (&ldb->v_disk);
1476 ldm_free_vblks (&ldb->v_volu);
1477 ldm_free_vblks (&ldb->v_comp);
1478 ldm_free_vblks (&ldb->v_part);
1479out:
1480 kfree (ldb);
1481 return result;
1482}
1483