blob: 789c625c7aa56e1c4b64dd3d483aca22e2c8fb29 [file] [log] [blame]
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>
Anton Altaparmakovdde33342007-05-21 09:37:42 +01005 * Copyright (c) 2001-2007 Anton Altaparmakov
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 * Copyright (C) 2001,2002 Jakob Kemi <jakob.kemi@telia.com>
7 *
Justin P. Mattock631dd1a2010-10-18 11:03:14 +02008 * Documentation is available at http://www.linux-ntfs.org/doku.php?id=downloads
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 *
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>
Andy Shevchenko91f06e62010-05-24 14:33:27 -070029#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include "ldm.h"
31#include "check.h"
32#include "msdos.h"
33
Linus Torvalds1da177e2005-04-16 15:20:36 -070034/**
35 * ldm_debug/info/error/crit - Output an error message
36 * @f: A printf format string containing the message
37 * @...: Variables to substitute into @f
38 *
39 * ldm_debug() writes a DEBUG level message to the syslog but only if the
40 * driver was compiled with debug enabled. Otherwise, the call turns into a NOP.
41 */
42#ifndef CONFIG_LDM_DEBUG
43#define ldm_debug(...) do {} while (0)
44#else
Harvey Harrison8e24eea2008-04-30 00:55:09 -070045#define ldm_debug(f, a...) _ldm_printk (KERN_DEBUG, __func__, f, ##a)
Linus Torvalds1da177e2005-04-16 15:20:36 -070046#endif
47
Harvey Harrison8e24eea2008-04-30 00:55:09 -070048#define ldm_crit(f, a...) _ldm_printk (KERN_CRIT, __func__, f, ##a)
49#define ldm_error(f, a...) _ldm_printk (KERN_ERR, __func__, f, ##a)
50#define ldm_info(f, a...) _ldm_printk (KERN_INFO, __func__, f, ##a)
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
52__attribute__ ((format (printf, 3, 4)))
53static void _ldm_printk (const char *level, const char *function,
54 const char *fmt, ...)
55{
56 static char buf[128];
57 va_list args;
58
59 va_start (args, fmt);
60 vsnprintf (buf, sizeof (buf), fmt, args);
61 va_end (args);
62
63 printk ("%s%s(): %s\n", level, function, buf);
64}
65
Linus Torvalds1da177e2005-04-16 15:20:36 -070066/**
67 * ldm_parse_hexbyte - Convert a ASCII hex number to a byte
68 * @src: Pointer to at least 2 characters to convert.
69 *
70 * Convert a two character ASCII hex string to a number.
71 *
72 * Return: 0-255 Success, the byte was parsed correctly
73 * -1 Error, an invalid character was supplied
74 */
75static int ldm_parse_hexbyte (const u8 *src)
76{
77 unsigned int x; /* For correct wrapping */
78 int h;
79
80 /* high part */
Andy Shevchenko91f06e62010-05-24 14:33:27 -070081 x = h = hex_to_bin(src[0]);
82 if (h < 0)
83 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070084
85 /* low part */
Andy Shevchenko91f06e62010-05-24 14:33:27 -070086 h = hex_to_bin(src[1]);
87 if (h < 0)
88 return -1;
89
90 return (x << 4) + h;
Linus Torvalds1da177e2005-04-16 15:20:36 -070091}
92
93/**
94 * ldm_parse_guid - Convert GUID from ASCII to binary
95 * @src: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba
96 * @dest: Memory block to hold binary GUID (16 bytes)
97 *
98 * N.B. The GUID need not be NULL terminated.
99 *
Richard Knutsson130c6b92006-09-30 23:27:15 -0700100 * Return: 'true' @dest contains binary GUID
101 * 'false' @dest contents are undefined
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 */
Richard Knutsson130c6b92006-09-30 23:27:15 -0700103static bool ldm_parse_guid (const u8 *src, u8 *dest)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104{
105 static const int size[] = { 4, 2, 2, 2, 6 };
106 int i, j, v;
107
108 if (src[8] != '-' || src[13] != '-' ||
109 src[18] != '-' || src[23] != '-')
Richard Knutsson130c6b92006-09-30 23:27:15 -0700110 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111
112 for (j = 0; j < 5; j++, src++)
113 for (i = 0; i < size[j]; i++, src+=2, *dest++ = v)
114 if ((v = ldm_parse_hexbyte (src)) < 0)
Richard Knutsson130c6b92006-09-30 23:27:15 -0700115 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116
Richard Knutsson130c6b92006-09-30 23:27:15 -0700117 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118}
119
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120/**
121 * ldm_parse_privhead - Read the LDM Database PRIVHEAD structure
122 * @data: Raw database PRIVHEAD structure loaded from the device
123 * @ph: In-memory privhead structure in which to return parsed information
124 *
125 * This parses the LDM database PRIVHEAD structure supplied in @data and
126 * sets up the in-memory privhead structure @ph with the obtained information.
127 *
Richard Knutsson130c6b92006-09-30 23:27:15 -0700128 * Return: 'true' @ph contains the PRIVHEAD data
129 * 'false' @ph contents are undefined
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 */
Anton Altaparmakovdde33342007-05-21 09:37:42 +0100131static bool ldm_parse_privhead(const u8 *data, struct privhead *ph)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132{
Anton Altaparmakovdde33342007-05-21 09:37:42 +0100133 bool is_vista = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134
Anton Altaparmakovdde33342007-05-21 09:37:42 +0100135 BUG_ON(!data || !ph);
Harvey Harrisonb7bbf8f2008-07-25 01:45:25 -0700136 if (MAGIC_PRIVHEAD != get_unaligned_be64(data)) {
Anton Altaparmakovdde33342007-05-21 09:37:42 +0100137 ldm_error("Cannot find PRIVHEAD structure. LDM database is"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 " corrupt. Aborting.");
Richard Knutsson130c6b92006-09-30 23:27:15 -0700139 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 }
Harvey Harrisonb7bbf8f2008-07-25 01:45:25 -0700141 ph->ver_major = get_unaligned_be16(data + 0x000C);
142 ph->ver_minor = get_unaligned_be16(data + 0x000E);
143 ph->logical_disk_start = get_unaligned_be64(data + 0x011B);
144 ph->logical_disk_size = get_unaligned_be64(data + 0x0123);
145 ph->config_start = get_unaligned_be64(data + 0x012B);
146 ph->config_size = get_unaligned_be64(data + 0x0133);
Anton Altaparmakovdde33342007-05-21 09:37:42 +0100147 /* Version 2.11 is Win2k/XP and version 2.12 is Vista. */
148 if (ph->ver_major == 2 && ph->ver_minor == 12)
149 is_vista = true;
150 if (!is_vista && (ph->ver_major != 2 || ph->ver_minor != 11)) {
151 ldm_error("Expected PRIVHEAD version 2.11 or 2.12, got %d.%d."
152 " Aborting.", ph->ver_major, ph->ver_minor);
Richard Knutsson130c6b92006-09-30 23:27:15 -0700153 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 }
Anton Altaparmakovdde33342007-05-21 09:37:42 +0100155 ldm_debug("PRIVHEAD version %d.%d (Windows %s).", ph->ver_major,
156 ph->ver_minor, is_vista ? "Vista" : "2000/XP");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 if (ph->config_size != LDM_DB_SIZE) { /* 1 MiB in sectors. */
Anton Altaparmakovdde33342007-05-21 09:37:42 +0100158 /* Warn the user and continue, carefully. */
159 ldm_info("Database is normally %u bytes, it claims to "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 "be %llu bytes.", LDM_DB_SIZE,
Jeff Garzik72dd9ca2007-05-22 00:28:11 -0400161 (unsigned long long)ph->config_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 }
Anton Altaparmakovdde33342007-05-21 09:37:42 +0100163 if ((ph->logical_disk_size == 0) || (ph->logical_disk_start +
164 ph->logical_disk_size > ph->config_start)) {
165 ldm_error("PRIVHEAD disk size doesn't match real disk size");
Richard Knutsson130c6b92006-09-30 23:27:15 -0700166 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 }
Anton Altaparmakovdde33342007-05-21 09:37:42 +0100168 if (!ldm_parse_guid(data + 0x0030, ph->disk_id)) {
169 ldm_error("PRIVHEAD contains an invalid GUID.");
Richard Knutsson130c6b92006-09-30 23:27:15 -0700170 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 }
Anton Altaparmakovdde33342007-05-21 09:37:42 +0100172 ldm_debug("Parsed PRIVHEAD successfully.");
Richard Knutsson130c6b92006-09-30 23:27:15 -0700173 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174}
175
176/**
177 * ldm_parse_tocblock - Read the LDM Database TOCBLOCK structure
178 * @data: Raw database TOCBLOCK structure loaded from the device
179 * @toc: In-memory toc structure in which to return parsed information
180 *
181 * This parses the LDM Database TOCBLOCK (table of contents) structure supplied
182 * in @data and sets up the in-memory tocblock structure @toc with the obtained
183 * information.
184 *
185 * N.B. The *_start and *_size values returned in @toc are not range-checked.
186 *
Richard Knutsson130c6b92006-09-30 23:27:15 -0700187 * Return: 'true' @toc contains the TOCBLOCK data
188 * 'false' @toc contents are undefined
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 */
Richard Knutsson130c6b92006-09-30 23:27:15 -0700190static bool ldm_parse_tocblock (const u8 *data, struct tocblock *toc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191{
192 BUG_ON (!data || !toc);
193
Harvey Harrisonb7bbf8f2008-07-25 01:45:25 -0700194 if (MAGIC_TOCBLOCK != get_unaligned_be64(data)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 ldm_crit ("Cannot find TOCBLOCK, database may be corrupt.");
Richard Knutsson130c6b92006-09-30 23:27:15 -0700196 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 }
198 strncpy (toc->bitmap1_name, data + 0x24, sizeof (toc->bitmap1_name));
199 toc->bitmap1_name[sizeof (toc->bitmap1_name) - 1] = 0;
Harvey Harrisonb7bbf8f2008-07-25 01:45:25 -0700200 toc->bitmap1_start = get_unaligned_be64(data + 0x2E);
201 toc->bitmap1_size = get_unaligned_be64(data + 0x36);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202
203 if (strncmp (toc->bitmap1_name, TOC_BITMAP1,
204 sizeof (toc->bitmap1_name)) != 0) {
205 ldm_crit ("TOCBLOCK's first bitmap is '%s', should be '%s'.",
206 TOC_BITMAP1, toc->bitmap1_name);
Richard Knutsson130c6b92006-09-30 23:27:15 -0700207 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 }
209 strncpy (toc->bitmap2_name, data + 0x46, sizeof (toc->bitmap2_name));
210 toc->bitmap2_name[sizeof (toc->bitmap2_name) - 1] = 0;
Harvey Harrisonb7bbf8f2008-07-25 01:45:25 -0700211 toc->bitmap2_start = get_unaligned_be64(data + 0x50);
212 toc->bitmap2_size = get_unaligned_be64(data + 0x58);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 if (strncmp (toc->bitmap2_name, TOC_BITMAP2,
214 sizeof (toc->bitmap2_name)) != 0) {
215 ldm_crit ("TOCBLOCK's second bitmap is '%s', should be '%s'.",
216 TOC_BITMAP2, toc->bitmap2_name);
Richard Knutsson130c6b92006-09-30 23:27:15 -0700217 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 }
219 ldm_debug ("Parsed TOCBLOCK successfully.");
Richard Knutsson130c6b92006-09-30 23:27:15 -0700220 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221}
222
223/**
224 * ldm_parse_vmdb - Read the LDM Database VMDB structure
225 * @data: Raw database VMDB structure loaded from the device
226 * @vm: In-memory vmdb structure in which to return parsed information
227 *
228 * This parses the LDM Database VMDB structure supplied in @data and sets up
229 * the in-memory vmdb structure @vm with the obtained information.
230 *
231 * N.B. The *_start, *_size and *_seq values will be range-checked later.
232 *
Richard Knutsson130c6b92006-09-30 23:27:15 -0700233 * Return: 'true' @vm contains VMDB info
234 * 'false' @vm contents are undefined
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 */
Richard Knutsson130c6b92006-09-30 23:27:15 -0700236static bool ldm_parse_vmdb (const u8 *data, struct vmdb *vm)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237{
238 BUG_ON (!data || !vm);
239
Harvey Harrisonb7bbf8f2008-07-25 01:45:25 -0700240 if (MAGIC_VMDB != get_unaligned_be32(data)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 ldm_crit ("Cannot find the VMDB, database may be corrupt.");
Richard Knutsson130c6b92006-09-30 23:27:15 -0700242 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 }
244
Harvey Harrisonb7bbf8f2008-07-25 01:45:25 -0700245 vm->ver_major = get_unaligned_be16(data + 0x12);
246 vm->ver_minor = get_unaligned_be16(data + 0x14);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 if ((vm->ver_major != 4) || (vm->ver_minor != 10)) {
248 ldm_error ("Expected VMDB version %d.%d, got %d.%d. "
249 "Aborting.", 4, 10, vm->ver_major, vm->ver_minor);
Richard Knutsson130c6b92006-09-30 23:27:15 -0700250 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 }
252
Harvey Harrisonb7bbf8f2008-07-25 01:45:25 -0700253 vm->vblk_size = get_unaligned_be32(data + 0x08);
254 vm->vblk_offset = get_unaligned_be32(data + 0x0C);
255 vm->last_vblk_seq = get_unaligned_be32(data + 0x04);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256
257 ldm_debug ("Parsed VMDB successfully.");
Richard Knutsson130c6b92006-09-30 23:27:15 -0700258 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259}
260
261/**
262 * ldm_compare_privheads - Compare two privhead objects
263 * @ph1: First privhead
264 * @ph2: Second privhead
265 *
266 * This compares the two privhead structures @ph1 and @ph2.
267 *
Richard Knutsson130c6b92006-09-30 23:27:15 -0700268 * Return: 'true' Identical
269 * 'false' Different
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 */
Richard Knutsson130c6b92006-09-30 23:27:15 -0700271static bool ldm_compare_privheads (const struct privhead *ph1,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 const struct privhead *ph2)
273{
274 BUG_ON (!ph1 || !ph2);
275
276 return ((ph1->ver_major == ph2->ver_major) &&
277 (ph1->ver_minor == ph2->ver_minor) &&
278 (ph1->logical_disk_start == ph2->logical_disk_start) &&
279 (ph1->logical_disk_size == ph2->logical_disk_size) &&
280 (ph1->config_start == ph2->config_start) &&
281 (ph1->config_size == ph2->config_size) &&
282 !memcmp (ph1->disk_id, ph2->disk_id, GUID_SIZE));
283}
284
285/**
286 * ldm_compare_tocblocks - Compare two tocblock objects
287 * @toc1: First toc
288 * @toc2: Second toc
289 *
290 * This compares the two tocblock structures @toc1 and @toc2.
291 *
Richard Knutsson130c6b92006-09-30 23:27:15 -0700292 * Return: 'true' Identical
293 * 'false' Different
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 */
Richard Knutsson130c6b92006-09-30 23:27:15 -0700295static bool ldm_compare_tocblocks (const struct tocblock *toc1,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 const struct tocblock *toc2)
297{
298 BUG_ON (!toc1 || !toc2);
299
300 return ((toc1->bitmap1_start == toc2->bitmap1_start) &&
301 (toc1->bitmap1_size == toc2->bitmap1_size) &&
302 (toc1->bitmap2_start == toc2->bitmap2_start) &&
303 (toc1->bitmap2_size == toc2->bitmap2_size) &&
304 !strncmp (toc1->bitmap1_name, toc2->bitmap1_name,
305 sizeof (toc1->bitmap1_name)) &&
306 !strncmp (toc1->bitmap2_name, toc2->bitmap2_name,
307 sizeof (toc1->bitmap2_name)));
308}
309
310/**
311 * ldm_validate_privheads - Compare the primary privhead with its backups
Tejun Heo1493bf22010-05-15 20:09:30 +0200312 * @state: Partition check state including device holding the LDM Database
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 * @ph1: Memory struct to fill with ph contents
314 *
315 * Read and compare all three privheads from disk.
316 *
317 * The privheads on disk show the size and location of the main disk area and
318 * the configuration area (the database). The values are range-checked against
319 * @hd, which contains the real size of the disk.
320 *
Richard Knutsson130c6b92006-09-30 23:27:15 -0700321 * Return: 'true' Success
322 * 'false' Error
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 */
Tejun Heo1493bf22010-05-15 20:09:30 +0200324static bool ldm_validate_privheads(struct parsed_partitions *state,
325 struct privhead *ph1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326{
327 static const int off[3] = { OFF_PRIV1, OFF_PRIV2, OFF_PRIV3 };
328 struct privhead *ph[3] = { ph1 };
329 Sector sect;
330 u8 *data;
Richard Knutsson130c6b92006-09-30 23:27:15 -0700331 bool result = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 long num_sects;
333 int i;
334
Tejun Heo1493bf22010-05-15 20:09:30 +0200335 BUG_ON (!state || !ph1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336
337 ph[1] = kmalloc (sizeof (*ph[1]), GFP_KERNEL);
338 ph[2] = kmalloc (sizeof (*ph[2]), GFP_KERNEL);
339 if (!ph[1] || !ph[2]) {
340 ldm_crit ("Out of memory.");
341 goto out;
342 }
343
344 /* off[1 & 2] are relative to ph[0]->config_start */
345 ph[0]->config_start = 0;
346
347 /* Read and parse privheads */
348 for (i = 0; i < 3; i++) {
Tejun Heo1493bf22010-05-15 20:09:30 +0200349 data = read_part_sector(state, ph[0]->config_start + off[i],
350 &sect);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 if (!data) {
352 ldm_crit ("Disk read failed.");
353 goto out;
354 }
355 result = ldm_parse_privhead (data, ph[i]);
356 put_dev_sector (sect);
357 if (!result) {
358 ldm_error ("Cannot find PRIVHEAD %d.", i+1); /* Log again */
359 if (i < 2)
360 goto out; /* Already logged */
361 else
362 break; /* FIXME ignore for now, 3rd PH can fail on odd-sized disks */
363 }
364 }
365
Tejun Heo1493bf22010-05-15 20:09:30 +0200366 num_sects = state->bdev->bd_inode->i_size >> 9;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367
368 if ((ph[0]->config_start > num_sects) ||
369 ((ph[0]->config_start + ph[0]->config_size) > num_sects)) {
370 ldm_crit ("Database extends beyond the end of the disk.");
371 goto out;
372 }
373
374 if ((ph[0]->logical_disk_start > ph[0]->config_start) ||
375 ((ph[0]->logical_disk_start + ph[0]->logical_disk_size)
376 > ph[0]->config_start)) {
377 ldm_crit ("Disk and database overlap.");
378 goto out;
379 }
380
381 if (!ldm_compare_privheads (ph[0], ph[1])) {
382 ldm_crit ("Primary and backup PRIVHEADs don't match.");
383 goto out;
384 }
385 /* FIXME ignore this for now
386 if (!ldm_compare_privheads (ph[0], ph[2])) {
387 ldm_crit ("Primary and backup PRIVHEADs don't match.");
388 goto out;
389 }*/
390 ldm_debug ("Validated PRIVHEADs successfully.");
Richard Knutsson130c6b92006-09-30 23:27:15 -0700391 result = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392out:
393 kfree (ph[1]);
394 kfree (ph[2]);
395 return result;
396}
397
398/**
399 * ldm_validate_tocblocks - Validate the table of contents and its backups
Tejun Heo1493bf22010-05-15 20:09:30 +0200400 * @state: Partition check state including device holding the LDM Database
401 * @base: Offset, into @state->bdev, of the database
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 * @ldb: Cache of the database structures
403 *
404 * Find and compare the four tables of contents of the LDM Database stored on
Tejun Heo1493bf22010-05-15 20:09:30 +0200405 * @state->bdev and return the parsed information into @toc1.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 *
407 * The offsets and sizes of the configs are range-checked against a privhead.
408 *
Richard Knutsson130c6b92006-09-30 23:27:15 -0700409 * Return: 'true' @toc1 contains validated TOCBLOCK info
410 * 'false' @toc1 contents are undefined
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 */
Tejun Heo1493bf22010-05-15 20:09:30 +0200412static bool ldm_validate_tocblocks(struct parsed_partitions *state,
413 unsigned long base, struct ldmdb *ldb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414{
415 static const int off[4] = { OFF_TOCB1, OFF_TOCB2, OFF_TOCB3, OFF_TOCB4};
416 struct tocblock *tb[4];
417 struct privhead *ph;
418 Sector sect;
419 u8 *data;
Anton Altaparmakovdde33342007-05-21 09:37:42 +0100420 int i, nr_tbs;
Richard Knutsson130c6b92006-09-30 23:27:15 -0700421 bool result = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422
Tejun Heo1493bf22010-05-15 20:09:30 +0200423 BUG_ON(!state || !ldb);
Anton Altaparmakovdde33342007-05-21 09:37:42 +0100424 ph = &ldb->ph;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 tb[0] = &ldb->toc;
Anton Altaparmakovdde33342007-05-21 09:37:42 +0100426 tb[1] = kmalloc(sizeof(*tb[1]) * 3, GFP_KERNEL);
427 if (!tb[1]) {
428 ldm_crit("Out of memory.");
429 goto err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 }
Anton Altaparmakovdde33342007-05-21 09:37:42 +0100431 tb[2] = (struct tocblock*)((u8*)tb[1] + sizeof(*tb[1]));
432 tb[3] = (struct tocblock*)((u8*)tb[2] + sizeof(*tb[2]));
433 /*
434 * Try to read and parse all four TOCBLOCKs.
435 *
436 * Windows Vista LDM v2.12 does not always have all four TOCBLOCKs so
437 * skip any that fail as long as we get at least one valid TOCBLOCK.
438 */
439 for (nr_tbs = i = 0; i < 4; i++) {
Tejun Heo1493bf22010-05-15 20:09:30 +0200440 data = read_part_sector(state, base + off[i], &sect);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 if (!data) {
Anton Altaparmakovdde33342007-05-21 09:37:42 +0100442 ldm_error("Disk read failed for TOCBLOCK %d.", i);
443 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 }
Anton Altaparmakovdde33342007-05-21 09:37:42 +0100445 if (ldm_parse_tocblock(data, tb[nr_tbs]))
446 nr_tbs++;
447 put_dev_sector(sect);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 }
Anton Altaparmakovdde33342007-05-21 09:37:42 +0100449 if (!nr_tbs) {
450 ldm_crit("Failed to find a valid TOCBLOCK.");
451 goto err;
452 }
453 /* Range check the TOCBLOCK against a privhead. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 if (((tb[0]->bitmap1_start + tb[0]->bitmap1_size) > ph->config_size) ||
Anton Altaparmakovdde33342007-05-21 09:37:42 +0100455 ((tb[0]->bitmap2_start + tb[0]->bitmap2_size) >
456 ph->config_size)) {
457 ldm_crit("The bitmaps are out of range. Giving up.");
458 goto err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 }
Anton Altaparmakovdde33342007-05-21 09:37:42 +0100460 /* Compare all loaded TOCBLOCKs. */
461 for (i = 1; i < nr_tbs; i++) {
462 if (!ldm_compare_tocblocks(tb[0], tb[i])) {
463 ldm_crit("TOCBLOCKs 0 and %d do not match.", i);
464 goto err;
465 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 }
Anton Altaparmakovdde33342007-05-21 09:37:42 +0100467 ldm_debug("Validated %d TOCBLOCKs successfully.", nr_tbs);
Richard Knutsson130c6b92006-09-30 23:27:15 -0700468 result = true;
Anton Altaparmakovdde33342007-05-21 09:37:42 +0100469err:
470 kfree(tb[1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 return result;
472}
473
474/**
475 * ldm_validate_vmdb - Read the VMDB and validate it
Tejun Heo1493bf22010-05-15 20:09:30 +0200476 * @state: Partition check state including device holding the LDM Database
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 * @base: Offset, into @bdev, of the database
478 * @ldb: Cache of the database structures
479 *
480 * Find the vmdb of the LDM Database stored on @bdev and return the parsed
481 * information in @ldb.
482 *
Richard Knutsson130c6b92006-09-30 23:27:15 -0700483 * Return: 'true' @ldb contains validated VBDB info
484 * 'false' @ldb contents are undefined
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 */
Tejun Heo1493bf22010-05-15 20:09:30 +0200486static bool ldm_validate_vmdb(struct parsed_partitions *state,
487 unsigned long base, struct ldmdb *ldb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488{
489 Sector sect;
490 u8 *data;
Richard Knutsson130c6b92006-09-30 23:27:15 -0700491 bool result = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492 struct vmdb *vm;
493 struct tocblock *toc;
494
Tejun Heo1493bf22010-05-15 20:09:30 +0200495 BUG_ON (!state || !ldb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496
497 vm = &ldb->vm;
498 toc = &ldb->toc;
499
Tejun Heo1493bf22010-05-15 20:09:30 +0200500 data = read_part_sector(state, base + OFF_VMDB, &sect);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 if (!data) {
502 ldm_crit ("Disk read failed.");
Richard Knutsson130c6b92006-09-30 23:27:15 -0700503 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504 }
505
506 if (!ldm_parse_vmdb (data, vm))
507 goto out; /* Already logged */
508
509 /* Are there uncommitted transactions? */
Harvey Harrisonb7bbf8f2008-07-25 01:45:25 -0700510 if (get_unaligned_be16(data + 0x10) != 0x01) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511 ldm_crit ("Database is not in a consistent state. Aborting.");
512 goto out;
513 }
514
515 if (vm->vblk_offset != 512)
516 ldm_info ("VBLKs start at offset 0x%04x.", vm->vblk_offset);
517
518 /*
519 * The last_vblkd_seq can be before the end of the vmdb, just make sure
520 * it is not out of bounds.
521 */
522 if ((vm->vblk_size * vm->last_vblk_seq) > (toc->bitmap1_size << 9)) {
523 ldm_crit ("VMDB exceeds allowed size specified by TOCBLOCK. "
524 "Database is corrupt. Aborting.");
525 goto out;
526 }
527
Richard Knutsson130c6b92006-09-30 23:27:15 -0700528 result = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529out:
530 put_dev_sector (sect);
531 return result;
532}
533
534
535/**
536 * ldm_validate_partition_table - Determine whether bdev might be a dynamic disk
Tejun Heo1493bf22010-05-15 20:09:30 +0200537 * @state: Partition check state including device holding the LDM Database
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 *
539 * This function provides a weak test to decide whether the device is a dynamic
540 * disk or not. It looks for an MS-DOS-style partition table containing at
541 * least one partition of type 0x42 (formerly SFS, now used by Windows for
542 * dynamic disks).
543 *
Tejun Heo1493bf22010-05-15 20:09:30 +0200544 * N.B. The only possible error can come from the read_part_sector and that is
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545 * only likely to happen if the underlying device is strange. If that IS
546 * the case we should return zero to let someone else try.
547 *
Tejun Heo1493bf22010-05-15 20:09:30 +0200548 * Return: 'true' @state->bdev is a dynamic disk
549 * 'false' @state->bdev is not a dynamic disk, or an error occurred
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 */
Tejun Heo1493bf22010-05-15 20:09:30 +0200551static bool ldm_validate_partition_table(struct parsed_partitions *state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552{
553 Sector sect;
554 u8 *data;
555 struct partition *p;
556 int i;
Richard Knutsson130c6b92006-09-30 23:27:15 -0700557 bool result = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558
Tejun Heo1493bf22010-05-15 20:09:30 +0200559 BUG_ON(!state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560
Tejun Heo1493bf22010-05-15 20:09:30 +0200561 data = read_part_sector(state, 0, &sect);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562 if (!data) {
563 ldm_crit ("Disk read failed.");
Richard Knutsson130c6b92006-09-30 23:27:15 -0700564 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 }
566
567 if (*(__le16*) (data + 0x01FE) != cpu_to_le16 (MSDOS_LABEL_MAGIC))
568 goto out;
569
570 p = (struct partition*)(data + 0x01BE);
571 for (i = 0; i < 4; i++, p++)
Anton Altaparmakovdde33342007-05-21 09:37:42 +0100572 if (SYS_IND (p) == LDM_PARTITION) {
Richard Knutsson130c6b92006-09-30 23:27:15 -0700573 result = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 break;
575 }
576
577 if (result)
578 ldm_debug ("Found W2K dynamic disk partition type.");
579
580out:
581 put_dev_sector (sect);
582 return result;
583}
584
585/**
586 * ldm_get_disk_objid - Search a linked list of vblk's for a given Disk Id
587 * @ldb: Cache of the database structures
588 *
589 * The LDM Database contains a list of all partitions on all dynamic disks.
590 * The primary PRIVHEAD, at the beginning of the physical disk, tells us
591 * the GUID of this disk. This function searches for the GUID in a linked
592 * list of vblk's.
593 *
594 * Return: Pointer, A matching vblk was found
595 * NULL, No match, or an error
596 */
597static struct vblk * ldm_get_disk_objid (const struct ldmdb *ldb)
598{
599 struct list_head *item;
600
601 BUG_ON (!ldb);
602
603 list_for_each (item, &ldb->v_disk) {
604 struct vblk *v = list_entry (item, struct vblk, list);
605 if (!memcmp (v->vblk.disk.disk_id, ldb->ph.disk_id, GUID_SIZE))
606 return v;
607 }
608
609 return NULL;
610}
611
612/**
613 * ldm_create_data_partitions - Create data partitions for this device
614 * @pp: List of the partitions parsed so far
615 * @ldb: Cache of the database structures
616 *
617 * The database contains ALL the partitions for ALL disk groups, so we need to
618 * filter out this specific disk. Using the disk's object id, we can find all
619 * the partitions in the database that belong to this disk.
620 *
621 * Add each partition in our database, to the parsed_partitions structure.
622 *
623 * N.B. This function creates the partitions in the order it finds partition
624 * objects in the linked list.
625 *
Richard Knutsson130c6b92006-09-30 23:27:15 -0700626 * Return: 'true' Partition created
627 * 'false' Error, probably a range checking problem
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 */
Richard Knutsson130c6b92006-09-30 23:27:15 -0700629static bool ldm_create_data_partitions (struct parsed_partitions *pp,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630 const struct ldmdb *ldb)
631{
632 struct list_head *item;
633 struct vblk *vb;
634 struct vblk *disk;
635 struct vblk_part *part;
636 int part_num = 1;
637
638 BUG_ON (!pp || !ldb);
639
640 disk = ldm_get_disk_objid (ldb);
641 if (!disk) {
642 ldm_crit ("Can't find the ID of this disk in the database.");
Richard Knutsson130c6b92006-09-30 23:27:15 -0700643 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644 }
645
Alexey Dobriyan9c867fb2010-08-10 18:03:14 -0700646 strlcat(pp->pp_buf, " [LDM]", PAGE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647
648 /* Create the data partitions */
649 list_for_each (item, &ldb->v_part) {
650 vb = list_entry (item, struct vblk, list);
651 part = &vb->vblk.part;
652
653 if (part->disk_id != disk->obj_id)
654 continue;
655
656 put_partition (pp, part_num, ldb->ph.logical_disk_start +
657 part->start, part->size);
658 part_num++;
659 }
660
Alexey Dobriyan9c867fb2010-08-10 18:03:14 -0700661 strlcat(pp->pp_buf, "\n", PAGE_SIZE);
Richard Knutsson130c6b92006-09-30 23:27:15 -0700662 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663}
664
665
666/**
667 * ldm_relative - Calculate the next relative offset
668 * @buffer: Block of data being worked on
669 * @buflen: Size of the block of data
670 * @base: Size of the previous fixed width fields
671 * @offset: Cumulative size of the previous variable-width fields
672 *
673 * Because many of the VBLK fields are variable-width, it's necessary
674 * to calculate each offset based on the previous one and the length
675 * of the field it pointed to.
676 *
677 * Return: -1 Error, the calculated offset exceeded the size of the buffer
678 * n OK, a range-checked offset into buffer
679 */
Anton Altaparmakov959bc2202007-07-16 19:39:02 +0100680static int ldm_relative(const u8 *buffer, int buflen, int base, int offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681{
682
683 base += offset;
Anton Altaparmakov959bc2202007-07-16 19:39:02 +0100684 if (!buffer || offset < 0 || base > buflen) {
685 if (!buffer)
686 ldm_error("!buffer");
687 if (offset < 0)
688 ldm_error("offset (%d) < 0", offset);
689 if (base > buflen)
690 ldm_error("base (%d) > buflen (%d)", base, buflen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691 return -1;
Anton Altaparmakov959bc2202007-07-16 19:39:02 +0100692 }
693 if (base + buffer[base] >= buflen) {
694 ldm_error("base (%d) + buffer[base] (%d) >= buflen (%d)", base,
695 buffer[base], buflen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696 return -1;
Anton Altaparmakov959bc2202007-07-16 19:39:02 +0100697 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698 return buffer[base] + offset + 1;
699}
700
701/**
702 * ldm_get_vnum - Convert a variable-width, big endian number, into cpu order
703 * @block: Pointer to the variable-width number to convert
704 *
705 * Large numbers in the LDM Database are often stored in a packed format. Each
706 * number is prefixed by a one byte width marker. All numbers in the database
707 * are stored in big-endian byte order. This function reads one of these
708 * numbers and returns the result
709 *
710 * N.B. This function DOES NOT perform any range checking, though the most
711 * it will read is eight bytes.
712 *
713 * Return: n A number
714 * 0 Zero, or an error occurred
715 */
716static u64 ldm_get_vnum (const u8 *block)
717{
718 u64 tmp = 0;
719 u8 length;
720
721 BUG_ON (!block);
722
723 length = *block++;
724
725 if (length && length <= 8)
726 while (length--)
727 tmp = (tmp << 8) | *block++;
728 else
729 ldm_error ("Illegal length %d.", length);
730
731 return tmp;
732}
733
734/**
735 * ldm_get_vstr - Read a length-prefixed string into a buffer
736 * @block: Pointer to the length marker
737 * @buffer: Location to copy string to
738 * @buflen: Size of the output buffer
739 *
740 * Many of the strings in the LDM Database are not NULL terminated. Instead
741 * they are prefixed by a one byte length marker. This function copies one of
742 * these strings into a buffer.
743 *
744 * N.B. This function DOES NOT perform any range checking on the input.
745 * If the buffer is too small, the output will be truncated.
746 *
747 * Return: 0, Error and @buffer contents are undefined
748 * n, String length in characters (excluding NULL)
749 * buflen-1, String was truncated.
750 */
751static int ldm_get_vstr (const u8 *block, u8 *buffer, int buflen)
752{
753 int length;
754
755 BUG_ON (!block || !buffer);
756
757 length = block[0];
758 if (length >= buflen) {
759 ldm_error ("Truncating string %d -> %d.", length, buflen);
760 length = buflen - 1;
761 }
762 memcpy (buffer, block + 1, length);
763 buffer[length] = 0;
764 return length;
765}
766
767
768/**
769 * ldm_parse_cmp3 - Read a raw VBLK Component object into a vblk structure
770 * @buffer: Block of data being worked on
771 * @buflen: Size of the block of data
772 * @vb: In-memory vblk in which to return information
773 *
774 * Read a raw VBLK Component object (version 3) into a vblk structure.
775 *
Richard Knutsson130c6b92006-09-30 23:27:15 -0700776 * Return: 'true' @vb contains a Component VBLK
777 * 'false' @vb contents are not defined
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778 */
Richard Knutsson130c6b92006-09-30 23:27:15 -0700779static bool ldm_parse_cmp3 (const u8 *buffer, int buflen, struct vblk *vb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780{
781 int r_objid, r_name, r_vstate, r_child, r_parent, r_stripe, r_cols, len;
782 struct vblk_comp *comp;
783
784 BUG_ON (!buffer || !vb);
785
786 r_objid = ldm_relative (buffer, buflen, 0x18, 0);
787 r_name = ldm_relative (buffer, buflen, 0x18, r_objid);
788 r_vstate = ldm_relative (buffer, buflen, 0x18, r_name);
789 r_child = ldm_relative (buffer, buflen, 0x1D, r_vstate);
790 r_parent = ldm_relative (buffer, buflen, 0x2D, r_child);
791
792 if (buffer[0x12] & VBLK_FLAG_COMP_STRIPE) {
793 r_stripe = ldm_relative (buffer, buflen, 0x2E, r_parent);
794 r_cols = ldm_relative (buffer, buflen, 0x2E, r_stripe);
795 len = r_cols;
796 } else {
797 r_stripe = 0;
798 r_cols = 0;
799 len = r_parent;
800 }
801 if (len < 0)
Richard Knutsson130c6b92006-09-30 23:27:15 -0700802 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803
804 len += VBLK_SIZE_CMP3;
Harvey Harrisonb7bbf8f2008-07-25 01:45:25 -0700805 if (len != get_unaligned_be32(buffer + 0x14))
Richard Knutsson130c6b92006-09-30 23:27:15 -0700806 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807
808 comp = &vb->vblk.comp;
809 ldm_get_vstr (buffer + 0x18 + r_name, comp->state,
810 sizeof (comp->state));
811 comp->type = buffer[0x18 + r_vstate];
812 comp->children = ldm_get_vnum (buffer + 0x1D + r_vstate);
813 comp->parent_id = ldm_get_vnum (buffer + 0x2D + r_child);
814 comp->chunksize = r_stripe ? ldm_get_vnum (buffer+r_parent+0x2E) : 0;
815
Richard Knutsson130c6b92006-09-30 23:27:15 -0700816 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817}
818
819/**
820 * ldm_parse_dgr3 - Read a raw VBLK Disk Group object into a vblk structure
821 * @buffer: Block of data being worked on
822 * @buflen: Size of the block of data
823 * @vb: In-memory vblk in which to return information
824 *
825 * Read a raw VBLK Disk Group object (version 3) into a vblk structure.
826 *
Richard Knutsson130c6b92006-09-30 23:27:15 -0700827 * Return: 'true' @vb contains a Disk Group VBLK
828 * 'false' @vb contents are not defined
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829 */
830static int ldm_parse_dgr3 (const u8 *buffer, int buflen, struct vblk *vb)
831{
832 int r_objid, r_name, r_diskid, r_id1, r_id2, len;
833 struct vblk_dgrp *dgrp;
834
835 BUG_ON (!buffer || !vb);
836
837 r_objid = ldm_relative (buffer, buflen, 0x18, 0);
838 r_name = ldm_relative (buffer, buflen, 0x18, r_objid);
839 r_diskid = ldm_relative (buffer, buflen, 0x18, r_name);
840
841 if (buffer[0x12] & VBLK_FLAG_DGR3_IDS) {
842 r_id1 = ldm_relative (buffer, buflen, 0x24, r_diskid);
843 r_id2 = ldm_relative (buffer, buflen, 0x24, r_id1);
844 len = r_id2;
845 } else {
846 r_id1 = 0;
847 r_id2 = 0;
848 len = r_diskid;
849 }
850 if (len < 0)
Richard Knutsson130c6b92006-09-30 23:27:15 -0700851 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852
853 len += VBLK_SIZE_DGR3;
Harvey Harrisonb7bbf8f2008-07-25 01:45:25 -0700854 if (len != get_unaligned_be32(buffer + 0x14))
Richard Knutsson130c6b92006-09-30 23:27:15 -0700855 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856
857 dgrp = &vb->vblk.dgrp;
858 ldm_get_vstr (buffer + 0x18 + r_name, dgrp->disk_id,
859 sizeof (dgrp->disk_id));
Richard Knutsson130c6b92006-09-30 23:27:15 -0700860 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861}
862
863/**
864 * ldm_parse_dgr4 - Read a raw VBLK Disk Group object into a vblk structure
865 * @buffer: Block of data being worked on
866 * @buflen: Size of the block of data
867 * @vb: In-memory vblk in which to return information
868 *
869 * Read a raw VBLK Disk Group object (version 4) into a vblk structure.
870 *
Richard Knutsson130c6b92006-09-30 23:27:15 -0700871 * Return: 'true' @vb contains a Disk Group VBLK
872 * 'false' @vb contents are not defined
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873 */
Richard Knutsson130c6b92006-09-30 23:27:15 -0700874static bool ldm_parse_dgr4 (const u8 *buffer, int buflen, struct vblk *vb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875{
876 char buf[64];
877 int r_objid, r_name, r_id1, r_id2, len;
878 struct vblk_dgrp *dgrp;
879
880 BUG_ON (!buffer || !vb);
881
882 r_objid = ldm_relative (buffer, buflen, 0x18, 0);
883 r_name = ldm_relative (buffer, buflen, 0x18, r_objid);
884
885 if (buffer[0x12] & VBLK_FLAG_DGR4_IDS) {
886 r_id1 = ldm_relative (buffer, buflen, 0x44, r_name);
887 r_id2 = ldm_relative (buffer, buflen, 0x44, r_id1);
888 len = r_id2;
889 } else {
890 r_id1 = 0;
891 r_id2 = 0;
892 len = r_name;
893 }
894 if (len < 0)
Richard Knutsson130c6b92006-09-30 23:27:15 -0700895 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896
897 len += VBLK_SIZE_DGR4;
Harvey Harrisonb7bbf8f2008-07-25 01:45:25 -0700898 if (len != get_unaligned_be32(buffer + 0x14))
Richard Knutsson130c6b92006-09-30 23:27:15 -0700899 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900
901 dgrp = &vb->vblk.dgrp;
902
903 ldm_get_vstr (buffer + 0x18 + r_objid, buf, sizeof (buf));
Richard Knutsson130c6b92006-09-30 23:27:15 -0700904 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905}
906
907/**
908 * ldm_parse_dsk3 - Read a raw VBLK Disk object into a vblk structure
909 * @buffer: Block of data being worked on
910 * @buflen: Size of the block of data
911 * @vb: In-memory vblk in which to return information
912 *
913 * Read a raw VBLK Disk object (version 3) into a vblk structure.
914 *
Richard Knutsson130c6b92006-09-30 23:27:15 -0700915 * Return: 'true' @vb contains a Disk VBLK
916 * 'false' @vb contents are not defined
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917 */
Richard Knutsson130c6b92006-09-30 23:27:15 -0700918static bool ldm_parse_dsk3 (const u8 *buffer, int buflen, struct vblk *vb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919{
920 int r_objid, r_name, r_diskid, r_altname, len;
921 struct vblk_disk *disk;
922
923 BUG_ON (!buffer || !vb);
924
925 r_objid = ldm_relative (buffer, buflen, 0x18, 0);
926 r_name = ldm_relative (buffer, buflen, 0x18, r_objid);
927 r_diskid = ldm_relative (buffer, buflen, 0x18, r_name);
928 r_altname = ldm_relative (buffer, buflen, 0x18, r_diskid);
929 len = r_altname;
930 if (len < 0)
Richard Knutsson130c6b92006-09-30 23:27:15 -0700931 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932
933 len += VBLK_SIZE_DSK3;
Harvey Harrisonb7bbf8f2008-07-25 01:45:25 -0700934 if (len != get_unaligned_be32(buffer + 0x14))
Richard Knutsson130c6b92006-09-30 23:27:15 -0700935 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936
937 disk = &vb->vblk.disk;
938 ldm_get_vstr (buffer + 0x18 + r_diskid, disk->alt_name,
939 sizeof (disk->alt_name));
940 if (!ldm_parse_guid (buffer + 0x19 + r_name, disk->disk_id))
Richard Knutsson130c6b92006-09-30 23:27:15 -0700941 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942
Richard Knutsson130c6b92006-09-30 23:27:15 -0700943 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700944}
945
946/**
947 * ldm_parse_dsk4 - Read a raw VBLK Disk object into a vblk structure
948 * @buffer: Block of data being worked on
949 * @buflen: Size of the block of data
950 * @vb: In-memory vblk in which to return information
951 *
952 * Read a raw VBLK Disk object (version 4) into a vblk structure.
953 *
Richard Knutsson130c6b92006-09-30 23:27:15 -0700954 * Return: 'true' @vb contains a Disk VBLK
955 * 'false' @vb contents are not defined
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956 */
Richard Knutsson130c6b92006-09-30 23:27:15 -0700957static bool ldm_parse_dsk4 (const u8 *buffer, int buflen, struct vblk *vb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700958{
959 int r_objid, r_name, len;
960 struct vblk_disk *disk;
961
962 BUG_ON (!buffer || !vb);
963
964 r_objid = ldm_relative (buffer, buflen, 0x18, 0);
965 r_name = ldm_relative (buffer, buflen, 0x18, r_objid);
966 len = r_name;
967 if (len < 0)
Richard Knutsson130c6b92006-09-30 23:27:15 -0700968 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969
970 len += VBLK_SIZE_DSK4;
Harvey Harrisonb7bbf8f2008-07-25 01:45:25 -0700971 if (len != get_unaligned_be32(buffer + 0x14))
Richard Knutsson130c6b92006-09-30 23:27:15 -0700972 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973
974 disk = &vb->vblk.disk;
975 memcpy (disk->disk_id, buffer + 0x18 + r_name, GUID_SIZE);
Richard Knutsson130c6b92006-09-30 23:27:15 -0700976 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977}
978
979/**
980 * ldm_parse_prt3 - Read a raw VBLK Partition object into a vblk structure
981 * @buffer: Block of data being worked on
982 * @buflen: Size of the block of data
983 * @vb: In-memory vblk in which to return information
984 *
985 * Read a raw VBLK Partition object (version 3) into a vblk structure.
986 *
Richard Knutsson130c6b92006-09-30 23:27:15 -0700987 * Return: 'true' @vb contains a Partition VBLK
988 * 'false' @vb contents are not defined
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989 */
Anton Altaparmakovdde33342007-05-21 09:37:42 +0100990static bool ldm_parse_prt3(const u8 *buffer, int buflen, struct vblk *vb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991{
992 int r_objid, r_name, r_size, r_parent, r_diskid, r_index, len;
993 struct vblk_part *part;
994
Anton Altaparmakovdde33342007-05-21 09:37:42 +0100995 BUG_ON(!buffer || !vb);
996 r_objid = ldm_relative(buffer, buflen, 0x18, 0);
997 if (r_objid < 0) {
998 ldm_error("r_objid %d < 0", r_objid);
999 return false;
1000 }
1001 r_name = ldm_relative(buffer, buflen, 0x18, r_objid);
1002 if (r_name < 0) {
1003 ldm_error("r_name %d < 0", r_name);
1004 return false;
1005 }
1006 r_size = ldm_relative(buffer, buflen, 0x34, r_name);
1007 if (r_size < 0) {
1008 ldm_error("r_size %d < 0", r_size);
1009 return false;
1010 }
1011 r_parent = ldm_relative(buffer, buflen, 0x34, r_size);
1012 if (r_parent < 0) {
1013 ldm_error("r_parent %d < 0", r_parent);
1014 return false;
1015 }
1016 r_diskid = ldm_relative(buffer, buflen, 0x34, r_parent);
1017 if (r_diskid < 0) {
1018 ldm_error("r_diskid %d < 0", r_diskid);
1019 return false;
1020 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001021 if (buffer[0x12] & VBLK_FLAG_PART_INDEX) {
Anton Altaparmakovdde33342007-05-21 09:37:42 +01001022 r_index = ldm_relative(buffer, buflen, 0x34, r_diskid);
1023 if (r_index < 0) {
1024 ldm_error("r_index %d < 0", r_index);
1025 return false;
1026 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001027 len = r_index;
1028 } else {
1029 r_index = 0;
1030 len = r_diskid;
1031 }
Anton Altaparmakovdde33342007-05-21 09:37:42 +01001032 if (len < 0) {
1033 ldm_error("len %d < 0", len);
Richard Knutsson130c6b92006-09-30 23:27:15 -07001034 return false;
Anton Altaparmakovdde33342007-05-21 09:37:42 +01001035 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036 len += VBLK_SIZE_PRT3;
Harvey Harrisonb7bbf8f2008-07-25 01:45:25 -07001037 if (len > get_unaligned_be32(buffer + 0x14)) {
Anton Altaparmakovdde33342007-05-21 09:37:42 +01001038 ldm_error("len %d > BE32(buffer + 0x14) %d", len,
Harvey Harrisonb7bbf8f2008-07-25 01:45:25 -07001039 get_unaligned_be32(buffer + 0x14));
Richard Knutsson130c6b92006-09-30 23:27:15 -07001040 return false;
Anton Altaparmakovdde33342007-05-21 09:37:42 +01001041 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042 part = &vb->vblk.part;
Harvey Harrisonb7bbf8f2008-07-25 01:45:25 -07001043 part->start = get_unaligned_be64(buffer + 0x24 + r_name);
1044 part->volume_offset = get_unaligned_be64(buffer + 0x2C + r_name);
Anton Altaparmakovdde33342007-05-21 09:37:42 +01001045 part->size = ldm_get_vnum(buffer + 0x34 + r_name);
1046 part->parent_id = ldm_get_vnum(buffer + 0x34 + r_size);
1047 part->disk_id = ldm_get_vnum(buffer + 0x34 + r_parent);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048 if (vb->flags & VBLK_FLAG_PART_INDEX)
1049 part->partnum = buffer[0x35 + r_diskid];
1050 else
1051 part->partnum = 0;
Richard Knutsson130c6b92006-09-30 23:27:15 -07001052 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053}
1054
1055/**
1056 * ldm_parse_vol5 - Read a raw VBLK Volume object into a vblk structure
1057 * @buffer: Block of data being worked on
1058 * @buflen: Size of the block of data
1059 * @vb: In-memory vblk in which to return information
1060 *
1061 * Read a raw VBLK Volume object (version 5) into a vblk structure.
1062 *
Richard Knutsson130c6b92006-09-30 23:27:15 -07001063 * Return: 'true' @vb contains a Volume VBLK
1064 * 'false' @vb contents are not defined
Linus Torvalds1da177e2005-04-16 15:20:36 -07001065 */
Anton Altaparmakov959bc2202007-07-16 19:39:02 +01001066static bool ldm_parse_vol5(const u8 *buffer, int buflen, struct vblk *vb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001067{
Anton Altaparmakov959bc2202007-07-16 19:39:02 +01001068 int r_objid, r_name, r_vtype, r_disable_drive_letter, r_child, r_size;
1069 int r_id1, r_id2, r_size2, r_drive, len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001070 struct vblk_volu *volu;
1071
Anton Altaparmakov959bc2202007-07-16 19:39:02 +01001072 BUG_ON(!buffer || !vb);
1073 r_objid = ldm_relative(buffer, buflen, 0x18, 0);
1074 if (r_objid < 0) {
1075 ldm_error("r_objid %d < 0", r_objid);
1076 return false;
1077 }
1078 r_name = ldm_relative(buffer, buflen, 0x18, r_objid);
1079 if (r_name < 0) {
1080 ldm_error("r_name %d < 0", r_name);
1081 return false;
1082 }
1083 r_vtype = ldm_relative(buffer, buflen, 0x18, r_name);
1084 if (r_vtype < 0) {
1085 ldm_error("r_vtype %d < 0", r_vtype);
1086 return false;
1087 }
1088 r_disable_drive_letter = ldm_relative(buffer, buflen, 0x18, r_vtype);
1089 if (r_disable_drive_letter < 0) {
1090 ldm_error("r_disable_drive_letter %d < 0",
1091 r_disable_drive_letter);
1092 return false;
1093 }
1094 r_child = ldm_relative(buffer, buflen, 0x2D, r_disable_drive_letter);
1095 if (r_child < 0) {
1096 ldm_error("r_child %d < 0", r_child);
1097 return false;
1098 }
1099 r_size = ldm_relative(buffer, buflen, 0x3D, r_child);
1100 if (r_size < 0) {
1101 ldm_error("r_size %d < 0", r_size);
1102 return false;
1103 }
1104 if (buffer[0x12] & VBLK_FLAG_VOLU_ID1) {
1105 r_id1 = ldm_relative(buffer, buflen, 0x52, r_size);
1106 if (r_id1 < 0) {
1107 ldm_error("r_id1 %d < 0", r_id1);
1108 return false;
1109 }
1110 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001111 r_id1 = r_size;
Anton Altaparmakov959bc2202007-07-16 19:39:02 +01001112 if (buffer[0x12] & VBLK_FLAG_VOLU_ID2) {
1113 r_id2 = ldm_relative(buffer, buflen, 0x52, r_id1);
1114 if (r_id2 < 0) {
1115 ldm_error("r_id2 %d < 0", r_id2);
1116 return false;
1117 }
1118 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001119 r_id2 = r_id1;
Anton Altaparmakov959bc2202007-07-16 19:39:02 +01001120 if (buffer[0x12] & VBLK_FLAG_VOLU_SIZE) {
1121 r_size2 = ldm_relative(buffer, buflen, 0x52, r_id2);
1122 if (r_size2 < 0) {
1123 ldm_error("r_size2 %d < 0", r_size2);
1124 return false;
1125 }
1126 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001127 r_size2 = r_id2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001128 if (buffer[0x12] & VBLK_FLAG_VOLU_DRIVE) {
Anton Altaparmakov959bc2202007-07-16 19:39:02 +01001129 r_drive = ldm_relative(buffer, buflen, 0x52, r_size2);
1130 if (r_drive < 0) {
1131 ldm_error("r_drive %d < 0", r_drive);
1132 return false;
1133 }
1134 } else
1135 r_drive = r_size2;
1136 len = r_drive;
1137 if (len < 0) {
1138 ldm_error("len %d < 0", len);
1139 return false;
1140 }
1141 len += VBLK_SIZE_VOL5;
Harvey Harrisonb7bbf8f2008-07-25 01:45:25 -07001142 if (len > get_unaligned_be32(buffer + 0x14)) {
Anton Altaparmakov959bc2202007-07-16 19:39:02 +01001143 ldm_error("len %d > BE32(buffer + 0x14) %d", len,
Harvey Harrisonb7bbf8f2008-07-25 01:45:25 -07001144 get_unaligned_be32(buffer + 0x14));
Anton Altaparmakov959bc2202007-07-16 19:39:02 +01001145 return false;
1146 }
1147 volu = &vb->vblk.volu;
1148 ldm_get_vstr(buffer + 0x18 + r_name, volu->volume_type,
1149 sizeof(volu->volume_type));
1150 memcpy(volu->volume_state, buffer + 0x18 + r_disable_drive_letter,
1151 sizeof(volu->volume_state));
1152 volu->size = ldm_get_vnum(buffer + 0x3D + r_child);
1153 volu->partition_type = buffer[0x41 + r_size];
1154 memcpy(volu->guid, buffer + 0x42 + r_size, sizeof(volu->guid));
1155 if (buffer[0x12] & VBLK_FLAG_VOLU_DRIVE) {
1156 ldm_get_vstr(buffer + 0x52 + r_size, volu->drive_hint,
1157 sizeof(volu->drive_hint));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001158 }
Richard Knutsson130c6b92006-09-30 23:27:15 -07001159 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001160}
1161
1162/**
1163 * ldm_parse_vblk - Read a raw VBLK object into a vblk structure
1164 * @buf: Block of data being worked on
1165 * @len: Size of the block of data
1166 * @vb: In-memory vblk in which to return information
1167 *
1168 * Read a raw VBLK object into a vblk structure. This function just reads the
1169 * information common to all VBLK types, then delegates the rest of the work to
1170 * helper functions: ldm_parse_*.
1171 *
Richard Knutsson130c6b92006-09-30 23:27:15 -07001172 * Return: 'true' @vb contains a VBLK
1173 * 'false' @vb contents are not defined
Linus Torvalds1da177e2005-04-16 15:20:36 -07001174 */
Richard Knutsson130c6b92006-09-30 23:27:15 -07001175static bool ldm_parse_vblk (const u8 *buf, int len, struct vblk *vb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001176{
Richard Knutsson130c6b92006-09-30 23:27:15 -07001177 bool result = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001178 int r_objid;
1179
1180 BUG_ON (!buf || !vb);
1181
1182 r_objid = ldm_relative (buf, len, 0x18, 0);
1183 if (r_objid < 0) {
1184 ldm_error ("VBLK header is corrupt.");
Richard Knutsson130c6b92006-09-30 23:27:15 -07001185 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186 }
1187
1188 vb->flags = buf[0x12];
1189 vb->type = buf[0x13];
1190 vb->obj_id = ldm_get_vnum (buf + 0x18);
1191 ldm_get_vstr (buf+0x18+r_objid, vb->name, sizeof (vb->name));
1192
1193 switch (vb->type) {
1194 case VBLK_CMP3: result = ldm_parse_cmp3 (buf, len, vb); break;
1195 case VBLK_DSK3: result = ldm_parse_dsk3 (buf, len, vb); break;
1196 case VBLK_DSK4: result = ldm_parse_dsk4 (buf, len, vb); break;
1197 case VBLK_DGR3: result = ldm_parse_dgr3 (buf, len, vb); break;
1198 case VBLK_DGR4: result = ldm_parse_dgr4 (buf, len, vb); break;
1199 case VBLK_PRT3: result = ldm_parse_prt3 (buf, len, vb); break;
1200 case VBLK_VOL5: result = ldm_parse_vol5 (buf, len, vb); break;
1201 }
1202
1203 if (result)
1204 ldm_debug ("Parsed VBLK 0x%llx (type: 0x%02x) ok.",
1205 (unsigned long long) vb->obj_id, vb->type);
1206 else
1207 ldm_error ("Failed to parse VBLK 0x%llx (type: 0x%02x).",
1208 (unsigned long long) vb->obj_id, vb->type);
1209
1210 return result;
1211}
1212
1213
1214/**
1215 * ldm_ldmdb_add - Adds a raw VBLK entry to the ldmdb database
1216 * @data: Raw VBLK to add to the database
1217 * @len: Size of the raw VBLK
1218 * @ldb: Cache of the database structures
1219 *
1220 * The VBLKs are sorted into categories. Partitions are also sorted by offset.
1221 *
1222 * N.B. This function does not check the validity of the VBLKs.
1223 *
Richard Knutsson130c6b92006-09-30 23:27:15 -07001224 * Return: 'true' The VBLK was added
1225 * 'false' An error occurred
Linus Torvalds1da177e2005-04-16 15:20:36 -07001226 */
Richard Knutsson130c6b92006-09-30 23:27:15 -07001227static bool ldm_ldmdb_add (u8 *data, int len, struct ldmdb *ldb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228{
1229 struct vblk *vb;
1230 struct list_head *item;
1231
1232 BUG_ON (!data || !ldb);
1233
1234 vb = kmalloc (sizeof (*vb), GFP_KERNEL);
1235 if (!vb) {
1236 ldm_crit ("Out of memory.");
Richard Knutsson130c6b92006-09-30 23:27:15 -07001237 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001238 }
1239
1240 if (!ldm_parse_vblk (data, len, vb)) {
1241 kfree(vb);
Richard Knutsson130c6b92006-09-30 23:27:15 -07001242 return false; /* Already logged */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001243 }
1244
1245 /* Put vblk into the correct list. */
1246 switch (vb->type) {
1247 case VBLK_DGR3:
1248 case VBLK_DGR4:
1249 list_add (&vb->list, &ldb->v_dgrp);
1250 break;
1251 case VBLK_DSK3:
1252 case VBLK_DSK4:
1253 list_add (&vb->list, &ldb->v_disk);
1254 break;
1255 case VBLK_VOL5:
1256 list_add (&vb->list, &ldb->v_volu);
1257 break;
1258 case VBLK_CMP3:
1259 list_add (&vb->list, &ldb->v_comp);
1260 break;
1261 case VBLK_PRT3:
1262 /* Sort by the partition's start sector. */
1263 list_for_each (item, &ldb->v_part) {
1264 struct vblk *v = list_entry (item, struct vblk, list);
1265 if ((v->vblk.part.disk_id == vb->vblk.part.disk_id) &&
1266 (v->vblk.part.start > vb->vblk.part.start)) {
1267 list_add_tail (&vb->list, &v->list);
Richard Knutsson130c6b92006-09-30 23:27:15 -07001268 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001269 }
1270 }
1271 list_add_tail (&vb->list, &ldb->v_part);
1272 break;
1273 }
Richard Knutsson130c6b92006-09-30 23:27:15 -07001274 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001275}
1276
1277/**
1278 * ldm_frag_add - Add a VBLK fragment to a list
1279 * @data: Raw fragment to be added to the list
1280 * @size: Size of the raw fragment
1281 * @frags: Linked list of VBLK fragments
1282 *
1283 * Fragmented VBLKs may not be consecutive in the database, so they are placed
1284 * in a list so they can be pieced together later.
1285 *
Richard Knutsson130c6b92006-09-30 23:27:15 -07001286 * Return: 'true' Success, the VBLK was added to the list
1287 * 'false' Error, a problem occurred
Linus Torvalds1da177e2005-04-16 15:20:36 -07001288 */
Richard Knutsson130c6b92006-09-30 23:27:15 -07001289static bool ldm_frag_add (const u8 *data, int size, struct list_head *frags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001290{
1291 struct frag *f;
1292 struct list_head *item;
1293 int rec, num, group;
1294
1295 BUG_ON (!data || !frags);
1296
Harvey Harrisonb7bbf8f2008-07-25 01:45:25 -07001297 group = get_unaligned_be32(data + 0x08);
1298 rec = get_unaligned_be16(data + 0x0C);
1299 num = get_unaligned_be16(data + 0x0E);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001300 if ((num < 1) || (num > 4)) {
1301 ldm_error ("A VBLK claims to have %d parts.", num);
Richard Knutsson130c6b92006-09-30 23:27:15 -07001302 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001303 }
1304
1305 list_for_each (item, frags) {
1306 f = list_entry (item, struct frag, list);
1307 if (f->group == group)
1308 goto found;
1309 }
1310
1311 f = kmalloc (sizeof (*f) + size*num, GFP_KERNEL);
1312 if (!f) {
1313 ldm_crit ("Out of memory.");
Richard Knutsson130c6b92006-09-30 23:27:15 -07001314 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001315 }
1316
1317 f->group = group;
1318 f->num = num;
1319 f->rec = rec;
1320 f->map = 0xFF << num;
1321
1322 list_add_tail (&f->list, frags);
1323found:
1324 if (f->map & (1 << rec)) {
1325 ldm_error ("Duplicate VBLK, part %d.", rec);
1326 f->map &= 0x7F; /* Mark the group as broken */
Richard Knutsson130c6b92006-09-30 23:27:15 -07001327 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001328 }
1329
1330 f->map |= (1 << rec);
1331
1332 if (num > 0) {
1333 data += VBLK_SIZE_HEAD;
1334 size -= VBLK_SIZE_HEAD;
1335 }
1336 memcpy (f->data+rec*(size-VBLK_SIZE_HEAD)+VBLK_SIZE_HEAD, data, size);
1337
Richard Knutsson130c6b92006-09-30 23:27:15 -07001338 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001339}
1340
1341/**
1342 * ldm_frag_free - Free a linked list of VBLK fragments
1343 * @list: Linked list of fragments
1344 *
1345 * Free a linked list of VBLK fragments
1346 *
1347 * Return: none
1348 */
1349static void ldm_frag_free (struct list_head *list)
1350{
1351 struct list_head *item, *tmp;
1352
1353 BUG_ON (!list);
1354
1355 list_for_each_safe (item, tmp, list)
1356 kfree (list_entry (item, struct frag, list));
1357}
1358
1359/**
1360 * ldm_frag_commit - Validate fragmented VBLKs and add them to the database
1361 * @frags: Linked list of VBLK fragments
1362 * @ldb: Cache of the database structures
1363 *
1364 * Now that all the fragmented VBLKs have been collected, they must be added to
1365 * the database for later use.
1366 *
Richard Knutsson130c6b92006-09-30 23:27:15 -07001367 * Return: 'true' All the fragments we added successfully
1368 * 'false' One or more of the fragments we invalid
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369 */
Richard Knutsson130c6b92006-09-30 23:27:15 -07001370static bool ldm_frag_commit (struct list_head *frags, struct ldmdb *ldb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001371{
1372 struct frag *f;
1373 struct list_head *item;
1374
1375 BUG_ON (!frags || !ldb);
1376
1377 list_for_each (item, frags) {
1378 f = list_entry (item, struct frag, list);
1379
1380 if (f->map != 0xFF) {
1381 ldm_error ("VBLK group %d is incomplete (0x%02x).",
1382 f->group, f->map);
Richard Knutsson130c6b92006-09-30 23:27:15 -07001383 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001384 }
1385
1386 if (!ldm_ldmdb_add (f->data, f->num*ldb->vm.vblk_size, ldb))
Richard Knutsson130c6b92006-09-30 23:27:15 -07001387 return false; /* Already logged */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001388 }
Richard Knutsson130c6b92006-09-30 23:27:15 -07001389 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001390}
1391
1392/**
1393 * ldm_get_vblks - Read the on-disk database of VBLKs into memory
Tejun Heo1493bf22010-05-15 20:09:30 +02001394 * @state: Partition check state including device holding the LDM Database
1395 * @base: Offset, into @state->bdev, of the database
Linus Torvalds1da177e2005-04-16 15:20:36 -07001396 * @ldb: Cache of the database structures
1397 *
1398 * To use the information from the VBLKs, they need to be read from the disk,
1399 * unpacked and validated. We cache them in @ldb according to their type.
1400 *
Richard Knutsson130c6b92006-09-30 23:27:15 -07001401 * Return: 'true' All the VBLKs were read successfully
1402 * 'false' An error occurred
Linus Torvalds1da177e2005-04-16 15:20:36 -07001403 */
Tejun Heo1493bf22010-05-15 20:09:30 +02001404static bool ldm_get_vblks(struct parsed_partitions *state, unsigned long base,
1405 struct ldmdb *ldb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001406{
1407 int size, perbuf, skip, finish, s, v, recs;
1408 u8 *data = NULL;
1409 Sector sect;
Richard Knutsson130c6b92006-09-30 23:27:15 -07001410 bool result = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001411 LIST_HEAD (frags);
1412
Tejun Heo1493bf22010-05-15 20:09:30 +02001413 BUG_ON(!state || !ldb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001414
1415 size = ldb->vm.vblk_size;
1416 perbuf = 512 / size;
1417 skip = ldb->vm.vblk_offset >> 9; /* Bytes to sectors */
1418 finish = (size * ldb->vm.last_vblk_seq) >> 9;
1419
1420 for (s = skip; s < finish; s++) { /* For each sector */
Tejun Heo1493bf22010-05-15 20:09:30 +02001421 data = read_part_sector(state, base + OFF_VMDB + s, &sect);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001422 if (!data) {
1423 ldm_crit ("Disk read failed.");
1424 goto out;
1425 }
1426
1427 for (v = 0; v < perbuf; v++, data+=size) { /* For each vblk */
Harvey Harrisonb7bbf8f2008-07-25 01:45:25 -07001428 if (MAGIC_VBLK != get_unaligned_be32(data)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001429 ldm_error ("Expected to find a VBLK.");
1430 goto out;
1431 }
1432
Harvey Harrisonb7bbf8f2008-07-25 01:45:25 -07001433 recs = get_unaligned_be16(data + 0x0E); /* Number of records */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001434 if (recs == 1) {
1435 if (!ldm_ldmdb_add (data, size, ldb))
1436 goto out; /* Already logged */
1437 } else if (recs > 1) {
1438 if (!ldm_frag_add (data, size, &frags))
1439 goto out; /* Already logged */
1440 }
1441 /* else Record is not in use, ignore it. */
1442 }
1443 put_dev_sector (sect);
1444 data = NULL;
1445 }
1446
1447 result = ldm_frag_commit (&frags, ldb); /* Failures, already logged */
1448out:
1449 if (data)
1450 put_dev_sector (sect);
1451 ldm_frag_free (&frags);
1452
1453 return result;
1454}
1455
1456/**
1457 * ldm_free_vblks - Free a linked list of vblk's
1458 * @lh: Head of a linked list of struct vblk
1459 *
1460 * Free a list of vblk's and free the memory used to maintain the list.
1461 *
1462 * Return: none
1463 */
1464static void ldm_free_vblks (struct list_head *lh)
1465{
1466 struct list_head *item, *tmp;
1467
1468 BUG_ON (!lh);
1469
1470 list_for_each_safe (item, tmp, lh)
1471 kfree (list_entry (item, struct vblk, list));
1472}
1473
1474
1475/**
1476 * ldm_partition - Find out whether a device is a dynamic disk and handle it
Tejun Heo1493bf22010-05-15 20:09:30 +02001477 * @state: Partition check state including device holding the LDM Database
Linus Torvalds1da177e2005-04-16 15:20:36 -07001478 *
1479 * This determines whether the device @bdev is a dynamic disk and if so creates
1480 * the partitions necessary in the gendisk structure pointed to by @hd.
1481 *
1482 * We create a dummy device 1, which contains the LDM database, and then create
1483 * each partition described by the LDM database in sequence as devices 2+. For
1484 * example, if the device is hda, we would have: hda1: LDM database, hda2, hda3,
1485 * and so on: the actual data containing partitions.
1486 *
Tejun Heo1493bf22010-05-15 20:09:30 +02001487 * Return: 1 Success, @state->bdev is a dynamic disk and we handled it
1488 * 0 Success, @state->bdev is not a dynamic disk
Linus Torvalds1da177e2005-04-16 15:20:36 -07001489 * -1 An error occurred before enough information had been read
Tejun Heo1493bf22010-05-15 20:09:30 +02001490 * Or @state->bdev is a dynamic disk, but it may be corrupted
Linus Torvalds1da177e2005-04-16 15:20:36 -07001491 */
Tejun Heo1493bf22010-05-15 20:09:30 +02001492int ldm_partition(struct parsed_partitions *state)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001493{
1494 struct ldmdb *ldb;
1495 unsigned long base;
1496 int result = -1;
1497
Tejun Heo1493bf22010-05-15 20:09:30 +02001498 BUG_ON(!state);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001499
1500 /* Look for signs of a Dynamic Disk */
Tejun Heo1493bf22010-05-15 20:09:30 +02001501 if (!ldm_validate_partition_table(state))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001502 return 0;
1503
1504 ldb = kmalloc (sizeof (*ldb), GFP_KERNEL);
1505 if (!ldb) {
1506 ldm_crit ("Out of memory.");
1507 goto out;
1508 }
1509
1510 /* Parse and check privheads. */
Tejun Heo1493bf22010-05-15 20:09:30 +02001511 if (!ldm_validate_privheads(state, &ldb->ph))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001512 goto out; /* Already logged */
1513
1514 /* All further references are relative to base (database start). */
1515 base = ldb->ph.config_start;
1516
1517 /* Parse and check tocs and vmdb. */
Tejun Heo1493bf22010-05-15 20:09:30 +02001518 if (!ldm_validate_tocblocks(state, base, ldb) ||
1519 !ldm_validate_vmdb(state, base, ldb))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001520 goto out; /* Already logged */
1521
1522 /* Initialize vblk lists in ldmdb struct */
1523 INIT_LIST_HEAD (&ldb->v_dgrp);
1524 INIT_LIST_HEAD (&ldb->v_disk);
1525 INIT_LIST_HEAD (&ldb->v_volu);
1526 INIT_LIST_HEAD (&ldb->v_comp);
1527 INIT_LIST_HEAD (&ldb->v_part);
1528
Tejun Heo1493bf22010-05-15 20:09:30 +02001529 if (!ldm_get_vblks(state, base, ldb)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001530 ldm_crit ("Failed to read the VBLKs from the database.");
1531 goto cleanup;
1532 }
1533
1534 /* Finally, create the data partition devices. */
Tejun Heo1493bf22010-05-15 20:09:30 +02001535 if (ldm_create_data_partitions(state, ldb)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001536 ldm_debug ("Parsed LDM database successfully.");
1537 result = 1;
1538 }
1539 /* else Already logged */
1540
1541cleanup:
1542 ldm_free_vblks (&ldb->v_dgrp);
1543 ldm_free_vblks (&ldb->v_disk);
1544 ldm_free_vblks (&ldb->v_volu);
1545 ldm_free_vblks (&ldb->v_comp);
1546 ldm_free_vblks (&ldb->v_part);
1547out:
1548 kfree (ldb);
1549 return result;
1550}