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1da177e4 LT |
1 | /** |
2 | * ldm - Support for Windows Logical Disk Manager (Dynamic Disks) | |
3 | * | |
4 | * Copyright (C) 2001,2002 Richard Russon <ldm@flatcap.org> | |
5 | * Copyright (c) 2001-2004 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 | ||
1da177e4 LT |
33 | /** |
34 | * ldm_debug/info/error/crit - Output an error message | |
35 | * @f: A printf format string containing the message | |
36 | * @...: Variables to substitute into @f | |
37 | * | |
38 | * ldm_debug() writes a DEBUG level message to the syslog but only if the | |
39 | * driver was compiled with debug enabled. Otherwise, the call turns into a NOP. | |
40 | */ | |
41 | #ifndef CONFIG_LDM_DEBUG | |
42 | #define ldm_debug(...) do {} while (0) | |
43 | #else | |
44 | #define ldm_debug(f, a...) _ldm_printk (KERN_DEBUG, __FUNCTION__, f, ##a) | |
45 | #endif | |
46 | ||
47 | #define ldm_crit(f, a...) _ldm_printk (KERN_CRIT, __FUNCTION__, f, ##a) | |
48 | #define ldm_error(f, a...) _ldm_printk (KERN_ERR, __FUNCTION__, f, ##a) | |
49 | #define ldm_info(f, a...) _ldm_printk (KERN_INFO, __FUNCTION__, f, ##a) | |
50 | ||
51 | __attribute__ ((format (printf, 3, 4))) | |
52 | static void _ldm_printk (const char *level, const char *function, | |
53 | const char *fmt, ...) | |
54 | { | |
55 | static char buf[128]; | |
56 | va_list args; | |
57 | ||
58 | va_start (args, fmt); | |
59 | vsnprintf (buf, sizeof (buf), fmt, args); | |
60 | va_end (args); | |
61 | ||
62 | printk ("%s%s(): %s\n", level, function, buf); | |
63 | } | |
64 | ||
65 | ||
66 | /** | |
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 | */ | |
75 | static int ldm_parse_hexbyte (const u8 *src) | |
76 | { | |
77 | unsigned int x; /* For correct wrapping */ | |
78 | int h; | |
79 | ||
80 | /* high part */ | |
81 | if ((x = src[0] - '0') <= '9'-'0') h = x; | |
82 | else if ((x = src[0] - 'a') <= 'f'-'a') h = x+10; | |
83 | else if ((x = src[0] - 'A') <= 'F'-'A') h = x+10; | |
84 | else return -1; | |
85 | h <<= 4; | |
86 | ||
87 | /* low part */ | |
88 | if ((x = src[1] - '0') <= '9'-'0') return h | x; | |
89 | if ((x = src[1] - 'a') <= 'f'-'a') return h | (x+10); | |
90 | if ((x = src[1] - 'A') <= 'F'-'A') return h | (x+10); | |
91 | return -1; | |
92 | } | |
93 | ||
94 | /** | |
95 | * ldm_parse_guid - Convert GUID from ASCII to binary | |
96 | * @src: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
97 | * @dest: Memory block to hold binary GUID (16 bytes) | |
98 | * | |
99 | * N.B. The GUID need not be NULL terminated. | |
100 | * | |
130c6b98 RK |
101 | * Return: 'true' @dest contains binary GUID |
102 | * 'false' @dest contents are undefined | |
1da177e4 | 103 | */ |
130c6b98 | 104 | static bool ldm_parse_guid (const u8 *src, u8 *dest) |
1da177e4 LT |
105 | { |
106 | static const int size[] = { 4, 2, 2, 2, 6 }; | |
107 | int i, j, v; | |
108 | ||
109 | if (src[8] != '-' || src[13] != '-' || | |
110 | src[18] != '-' || src[23] != '-') | |
130c6b98 | 111 | return false; |
1da177e4 LT |
112 | |
113 | for (j = 0; j < 5; j++, src++) | |
114 | for (i = 0; i < size[j]; i++, src+=2, *dest++ = v) | |
115 | if ((v = ldm_parse_hexbyte (src)) < 0) | |
130c6b98 | 116 | return false; |
1da177e4 | 117 | |
130c6b98 | 118 | return true; |
1da177e4 LT |
119 | } |
120 | ||
121 | ||
122 | /** | |
123 | * ldm_parse_privhead - Read the LDM Database PRIVHEAD structure | |
124 | * @data: Raw database PRIVHEAD structure loaded from the device | |
125 | * @ph: In-memory privhead structure in which to return parsed information | |
126 | * | |
127 | * This parses the LDM database PRIVHEAD structure supplied in @data and | |
128 | * sets up the in-memory privhead structure @ph with the obtained information. | |
129 | * | |
130c6b98 RK |
130 | * Return: 'true' @ph contains the PRIVHEAD data |
131 | * 'false' @ph contents are undefined | |
1da177e4 | 132 | */ |
130c6b98 | 133 | static bool ldm_parse_privhead (const u8 *data, struct privhead *ph) |
1da177e4 LT |
134 | { |
135 | BUG_ON (!data || !ph); | |
136 | ||
137 | if (MAGIC_PRIVHEAD != BE64 (data)) { | |
138 | ldm_error ("Cannot find PRIVHEAD structure. LDM database is" | |
139 | " corrupt. Aborting."); | |
130c6b98 | 140 | return false; |
1da177e4 LT |
141 | } |
142 | ||
143 | ph->ver_major = BE16 (data + 0x000C); | |
144 | ph->ver_minor = BE16 (data + 0x000E); | |
145 | ph->logical_disk_start = BE64 (data + 0x011B); | |
146 | ph->logical_disk_size = BE64 (data + 0x0123); | |
147 | ph->config_start = BE64 (data + 0x012B); | |
148 | ph->config_size = BE64 (data + 0x0133); | |
149 | ||
150 | if ((ph->ver_major != 2) || (ph->ver_minor != 11)) { | |
151 | ldm_error ("Expected PRIVHEAD version %d.%d, got %d.%d." | |
152 | " Aborting.", 2, 11, ph->ver_major, ph->ver_minor); | |
130c6b98 | 153 | return false; |
1da177e4 LT |
154 | } |
155 | if (ph->config_size != LDM_DB_SIZE) { /* 1 MiB in sectors. */ | |
156 | /* Warn the user and continue, carefully */ | |
157 | ldm_info ("Database is normally %u bytes, it claims to " | |
158 | "be %llu bytes.", LDM_DB_SIZE, | |
159 | (unsigned long long)ph->config_size ); | |
160 | } | |
161 | if ((ph->logical_disk_size == 0) || | |
162 | (ph->logical_disk_start + ph->logical_disk_size > ph->config_start)) { | |
163 | ldm_error ("PRIVHEAD disk size doesn't match real disk size"); | |
130c6b98 | 164 | return false; |
1da177e4 LT |
165 | } |
166 | ||
167 | if (!ldm_parse_guid (data + 0x0030, ph->disk_id)) { | |
168 | ldm_error ("PRIVHEAD contains an invalid GUID."); | |
130c6b98 | 169 | return false; |
1da177e4 LT |
170 | } |
171 | ||
172 | ldm_debug ("Parsed PRIVHEAD successfully."); | |
130c6b98 | 173 | return true; |
1da177e4 LT |
174 | } |
175 | ||
176 | /** | |
177 | * ldm_parse_tocblock - Read the LDM Database TOCBLOCK structure | |
178 | * @data: Raw database TOCBLOCK structure loaded from the device | |
179 | * @toc: In-memory toc structure in which to return parsed information | |
180 | * | |
181 | * This parses the LDM Database TOCBLOCK (table of contents) structure supplied | |
182 | * in @data and sets up the in-memory tocblock structure @toc with the obtained | |
183 | * information. | |
184 | * | |
185 | * N.B. The *_start and *_size values returned in @toc are not range-checked. | |
186 | * | |
130c6b98 RK |
187 | * Return: 'true' @toc contains the TOCBLOCK data |
188 | * 'false' @toc contents are undefined | |
1da177e4 | 189 | */ |
130c6b98 | 190 | static bool ldm_parse_tocblock (const u8 *data, struct tocblock *toc) |
1da177e4 LT |
191 | { |
192 | BUG_ON (!data || !toc); | |
193 | ||
194 | if (MAGIC_TOCBLOCK != BE64 (data)) { | |
195 | ldm_crit ("Cannot find TOCBLOCK, database may be corrupt."); | |
130c6b98 | 196 | return false; |
1da177e4 LT |
197 | } |
198 | strncpy (toc->bitmap1_name, data + 0x24, sizeof (toc->bitmap1_name)); | |
199 | toc->bitmap1_name[sizeof (toc->bitmap1_name) - 1] = 0; | |
200 | toc->bitmap1_start = BE64 (data + 0x2E); | |
201 | toc->bitmap1_size = BE64 (data + 0x36); | |
202 | ||
203 | if (strncmp (toc->bitmap1_name, TOC_BITMAP1, | |
204 | sizeof (toc->bitmap1_name)) != 0) { | |
205 | ldm_crit ("TOCBLOCK's first bitmap is '%s', should be '%s'.", | |
206 | TOC_BITMAP1, toc->bitmap1_name); | |
130c6b98 | 207 | return false; |
1da177e4 LT |
208 | } |
209 | strncpy (toc->bitmap2_name, data + 0x46, sizeof (toc->bitmap2_name)); | |
210 | toc->bitmap2_name[sizeof (toc->bitmap2_name) - 1] = 0; | |
211 | toc->bitmap2_start = BE64 (data + 0x50); | |
212 | toc->bitmap2_size = BE64 (data + 0x58); | |
213 | if (strncmp (toc->bitmap2_name, TOC_BITMAP2, | |
214 | sizeof (toc->bitmap2_name)) != 0) { | |
215 | ldm_crit ("TOCBLOCK's second bitmap is '%s', should be '%s'.", | |
216 | TOC_BITMAP2, toc->bitmap2_name); | |
130c6b98 | 217 | return false; |
1da177e4 LT |
218 | } |
219 | ldm_debug ("Parsed TOCBLOCK successfully."); | |
130c6b98 | 220 | return true; |
1da177e4 LT |
221 | } |
222 | ||
223 | /** | |
224 | * ldm_parse_vmdb - Read the LDM Database VMDB structure | |
225 | * @data: Raw database VMDB structure loaded from the device | |
226 | * @vm: In-memory vmdb structure in which to return parsed information | |
227 | * | |
228 | * This parses the LDM Database VMDB structure supplied in @data and sets up | |
229 | * the in-memory vmdb structure @vm with the obtained information. | |
230 | * | |
231 | * N.B. The *_start, *_size and *_seq values will be range-checked later. | |
232 | * | |
130c6b98 RK |
233 | * Return: 'true' @vm contains VMDB info |
234 | * 'false' @vm contents are undefined | |
1da177e4 | 235 | */ |
130c6b98 | 236 | static bool ldm_parse_vmdb (const u8 *data, struct vmdb *vm) |
1da177e4 LT |
237 | { |
238 | BUG_ON (!data || !vm); | |
239 | ||
240 | if (MAGIC_VMDB != BE32 (data)) { | |
241 | ldm_crit ("Cannot find the VMDB, database may be corrupt."); | |
130c6b98 | 242 | return false; |
1da177e4 LT |
243 | } |
244 | ||
245 | vm->ver_major = BE16 (data + 0x12); | |
246 | vm->ver_minor = BE16 (data + 0x14); | |
247 | if ((vm->ver_major != 4) || (vm->ver_minor != 10)) { | |
248 | ldm_error ("Expected VMDB version %d.%d, got %d.%d. " | |
249 | "Aborting.", 4, 10, vm->ver_major, vm->ver_minor); | |
130c6b98 | 250 | return false; |
1da177e4 LT |
251 | } |
252 | ||
253 | vm->vblk_size = BE32 (data + 0x08); | |
254 | vm->vblk_offset = BE32 (data + 0x0C); | |
255 | vm->last_vblk_seq = BE32 (data + 0x04); | |
256 | ||
257 | ldm_debug ("Parsed VMDB successfully."); | |
130c6b98 | 258 | return true; |
1da177e4 LT |
259 | } |
260 | ||
261 | /** | |
262 | * ldm_compare_privheads - Compare two privhead objects | |
263 | * @ph1: First privhead | |
264 | * @ph2: Second privhead | |
265 | * | |
266 | * This compares the two privhead structures @ph1 and @ph2. | |
267 | * | |
130c6b98 RK |
268 | * Return: 'true' Identical |
269 | * 'false' Different | |
1da177e4 | 270 | */ |
130c6b98 | 271 | static bool ldm_compare_privheads (const struct privhead *ph1, |
1da177e4 LT |
272 | const struct privhead *ph2) |
273 | { | |
274 | BUG_ON (!ph1 || !ph2); | |
275 | ||
276 | return ((ph1->ver_major == ph2->ver_major) && | |
277 | (ph1->ver_minor == ph2->ver_minor) && | |
278 | (ph1->logical_disk_start == ph2->logical_disk_start) && | |
279 | (ph1->logical_disk_size == ph2->logical_disk_size) && | |
280 | (ph1->config_start == ph2->config_start) && | |
281 | (ph1->config_size == ph2->config_size) && | |
282 | !memcmp (ph1->disk_id, ph2->disk_id, GUID_SIZE)); | |
283 | } | |
284 | ||
285 | /** | |
286 | * ldm_compare_tocblocks - Compare two tocblock objects | |
287 | * @toc1: First toc | |
288 | * @toc2: Second toc | |
289 | * | |
290 | * This compares the two tocblock structures @toc1 and @toc2. | |
291 | * | |
130c6b98 RK |
292 | * Return: 'true' Identical |
293 | * 'false' Different | |
1da177e4 | 294 | */ |
130c6b98 | 295 | static bool ldm_compare_tocblocks (const struct tocblock *toc1, |
1da177e4 LT |
296 | const struct tocblock *toc2) |
297 | { | |
298 | BUG_ON (!toc1 || !toc2); | |
299 | ||
300 | return ((toc1->bitmap1_start == toc2->bitmap1_start) && | |
301 | (toc1->bitmap1_size == toc2->bitmap1_size) && | |
302 | (toc1->bitmap2_start == toc2->bitmap2_start) && | |
303 | (toc1->bitmap2_size == toc2->bitmap2_size) && | |
304 | !strncmp (toc1->bitmap1_name, toc2->bitmap1_name, | |
305 | sizeof (toc1->bitmap1_name)) && | |
306 | !strncmp (toc1->bitmap2_name, toc2->bitmap2_name, | |
307 | sizeof (toc1->bitmap2_name))); | |
308 | } | |
309 | ||
310 | /** | |
311 | * ldm_validate_privheads - Compare the primary privhead with its backups | |
312 | * @bdev: Device holding the LDM Database | |
313 | * @ph1: Memory struct to fill with ph contents | |
314 | * | |
315 | * Read and compare all three privheads from disk. | |
316 | * | |
317 | * The privheads on disk show the size and location of the main disk area and | |
318 | * the configuration area (the database). The values are range-checked against | |
319 | * @hd, which contains the real size of the disk. | |
320 | * | |
130c6b98 RK |
321 | * Return: 'true' Success |
322 | * 'false' Error | |
1da177e4 | 323 | */ |
130c6b98 | 324 | static bool ldm_validate_privheads (struct block_device *bdev, |
1da177e4 LT |
325 | struct privhead *ph1) |
326 | { | |
327 | static const int off[3] = { OFF_PRIV1, OFF_PRIV2, OFF_PRIV3 }; | |
328 | struct privhead *ph[3] = { ph1 }; | |
329 | Sector sect; | |
330 | u8 *data; | |
130c6b98 | 331 | bool result = false; |
1da177e4 LT |
332 | long num_sects; |
333 | int i; | |
334 | ||
335 | BUG_ON (!bdev || !ph1); | |
336 | ||
337 | ph[1] = kmalloc (sizeof (*ph[1]), GFP_KERNEL); | |
338 | ph[2] = kmalloc (sizeof (*ph[2]), GFP_KERNEL); | |
339 | if (!ph[1] || !ph[2]) { | |
340 | ldm_crit ("Out of memory."); | |
341 | goto out; | |
342 | } | |
343 | ||
344 | /* off[1 & 2] are relative to ph[0]->config_start */ | |
345 | ph[0]->config_start = 0; | |
346 | ||
347 | /* Read and parse privheads */ | |
348 | for (i = 0; i < 3; i++) { | |
349 | data = read_dev_sector (bdev, | |
350 | ph[0]->config_start + off[i], §); | |
351 | if (!data) { | |
352 | ldm_crit ("Disk read failed."); | |
353 | goto out; | |
354 | } | |
355 | result = ldm_parse_privhead (data, ph[i]); | |
356 | put_dev_sector (sect); | |
357 | if (!result) { | |
358 | ldm_error ("Cannot find PRIVHEAD %d.", i+1); /* Log again */ | |
359 | if (i < 2) | |
360 | goto out; /* Already logged */ | |
361 | else | |
362 | break; /* FIXME ignore for now, 3rd PH can fail on odd-sized disks */ | |
363 | } | |
364 | } | |
365 | ||
366 | num_sects = bdev->bd_inode->i_size >> 9; | |
367 | ||
368 | if ((ph[0]->config_start > num_sects) || | |
369 | ((ph[0]->config_start + ph[0]->config_size) > num_sects)) { | |
370 | ldm_crit ("Database extends beyond the end of the disk."); | |
371 | goto out; | |
372 | } | |
373 | ||
374 | if ((ph[0]->logical_disk_start > ph[0]->config_start) || | |
375 | ((ph[0]->logical_disk_start + ph[0]->logical_disk_size) | |
376 | > ph[0]->config_start)) { | |
377 | ldm_crit ("Disk and database overlap."); | |
378 | goto out; | |
379 | } | |
380 | ||
381 | if (!ldm_compare_privheads (ph[0], ph[1])) { | |
382 | ldm_crit ("Primary and backup PRIVHEADs don't match."); | |
383 | goto out; | |
384 | } | |
385 | /* 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."); | |
130c6b98 | 391 | result = true; |
1da177e4 LT |
392 | out: |
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 | |
400 | * @bdev: Device holding the LDM Database | |
401 | * @base: Offset, into @bdev, of the database | |
402 | * @ldb: Cache of the database structures | |
403 | * | |
404 | * Find and compare the four tables of contents of the LDM Database stored on | |
405 | * @bdev and return the parsed information into @toc1. | |
406 | * | |
407 | * The offsets and sizes of the configs are range-checked against a privhead. | |
408 | * | |
130c6b98 RK |
409 | * Return: 'true' @toc1 contains validated TOCBLOCK info |
410 | * 'false' @toc1 contents are undefined | |
1da177e4 | 411 | */ |
130c6b98 | 412 | static bool ldm_validate_tocblocks (struct block_device *bdev, |
1da177e4 LT |
413 | unsigned long base, struct ldmdb *ldb) |
414 | { | |
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; | |
130c6b98 | 420 | bool result = false; |
1da177e4 LT |
421 | int i; |
422 | ||
423 | BUG_ON (!bdev || !ldb); | |
424 | ||
425 | ph = &ldb->ph; | |
426 | tb[0] = &ldb->toc; | |
427 | tb[1] = kmalloc (sizeof (*tb[1]), GFP_KERNEL); | |
428 | tb[2] = kmalloc (sizeof (*tb[2]), GFP_KERNEL); | |
429 | tb[3] = kmalloc (sizeof (*tb[3]), GFP_KERNEL); | |
430 | if (!tb[1] || !tb[2] || !tb[3]) { | |
431 | ldm_crit ("Out of memory."); | |
432 | goto out; | |
433 | } | |
434 | ||
435 | for (i = 0; i < 4; i++) /* Read and parse all four toc's. */ | |
436 | { | |
437 | data = read_dev_sector (bdev, base + off[i], §); | |
438 | if (!data) { | |
439 | ldm_crit ("Disk read failed."); | |
440 | goto out; | |
441 | } | |
442 | result = ldm_parse_tocblock (data, tb[i]); | |
443 | put_dev_sector (sect); | |
444 | if (!result) | |
445 | goto out; /* Already logged */ | |
446 | } | |
447 | ||
448 | /* Range check the toc against a privhead. */ | |
449 | if (((tb[0]->bitmap1_start + tb[0]->bitmap1_size) > ph->config_size) || | |
450 | ((tb[0]->bitmap2_start + tb[0]->bitmap2_size) > ph->config_size)) { | |
451 | ldm_crit ("The bitmaps are out of range. Giving up."); | |
452 | goto out; | |
453 | } | |
454 | ||
455 | if (!ldm_compare_tocblocks (tb[0], tb[1]) || /* Compare all tocs. */ | |
456 | !ldm_compare_tocblocks (tb[0], tb[2]) || | |
457 | !ldm_compare_tocblocks (tb[0], tb[3])) { | |
458 | ldm_crit ("The TOCBLOCKs don't match."); | |
459 | goto out; | |
460 | } | |
461 | ||
462 | ldm_debug ("Validated TOCBLOCKs successfully."); | |
130c6b98 | 463 | result = true; |
1da177e4 LT |
464 | out: |
465 | kfree (tb[1]); | |
466 | kfree (tb[2]); | |
467 | kfree (tb[3]); | |
468 | return result; | |
469 | } | |
470 | ||
471 | /** | |
472 | * ldm_validate_vmdb - Read the VMDB and validate it | |
473 | * @bdev: Device holding the LDM Database | |
474 | * @base: Offset, into @bdev, of the database | |
475 | * @ldb: Cache of the database structures | |
476 | * | |
477 | * Find the vmdb of the LDM Database stored on @bdev and return the parsed | |
478 | * information in @ldb. | |
479 | * | |
130c6b98 RK |
480 | * Return: 'true' @ldb contains validated VBDB info |
481 | * 'false' @ldb contents are undefined | |
1da177e4 | 482 | */ |
130c6b98 | 483 | static bool ldm_validate_vmdb (struct block_device *bdev, unsigned long base, |
1da177e4 LT |
484 | struct ldmdb *ldb) |
485 | { | |
486 | Sector sect; | |
487 | u8 *data; | |
130c6b98 | 488 | bool result = false; |
1da177e4 LT |
489 | struct vmdb *vm; |
490 | struct tocblock *toc; | |
491 | ||
492 | BUG_ON (!bdev || !ldb); | |
493 | ||
494 | vm = &ldb->vm; | |
495 | toc = &ldb->toc; | |
496 | ||
497 | data = read_dev_sector (bdev, base + OFF_VMDB, §); | |
498 | if (!data) { | |
499 | ldm_crit ("Disk read failed."); | |
130c6b98 | 500 | return false; |
1da177e4 LT |
501 | } |
502 | ||
503 | if (!ldm_parse_vmdb (data, vm)) | |
504 | goto out; /* Already logged */ | |
505 | ||
506 | /* Are there uncommitted transactions? */ | |
507 | if (BE16(data + 0x10) != 0x01) { | |
508 | ldm_crit ("Database is not in a consistent state. Aborting."); | |
509 | goto out; | |
510 | } | |
511 | ||
512 | if (vm->vblk_offset != 512) | |
513 | ldm_info ("VBLKs start at offset 0x%04x.", vm->vblk_offset); | |
514 | ||
515 | /* | |
516 | * The last_vblkd_seq can be before the end of the vmdb, just make sure | |
517 | * it is not out of bounds. | |
518 | */ | |
519 | if ((vm->vblk_size * vm->last_vblk_seq) > (toc->bitmap1_size << 9)) { | |
520 | ldm_crit ("VMDB exceeds allowed size specified by TOCBLOCK. " | |
521 | "Database is corrupt. Aborting."); | |
522 | goto out; | |
523 | } | |
524 | ||
130c6b98 | 525 | result = true; |
1da177e4 LT |
526 | out: |
527 | put_dev_sector (sect); | |
528 | return result; | |
529 | } | |
530 | ||
531 | ||
532 | /** | |
533 | * ldm_validate_partition_table - Determine whether bdev might be a dynamic disk | |
534 | * @bdev: Device holding the LDM Database | |
535 | * | |
536 | * This function provides a weak test to decide whether the device is a dynamic | |
537 | * disk or not. It looks for an MS-DOS-style partition table containing at | |
538 | * least one partition of type 0x42 (formerly SFS, now used by Windows for | |
539 | * dynamic disks). | |
540 | * | |
541 | * N.B. The only possible error can come from the read_dev_sector and that is | |
542 | * only likely to happen if the underlying device is strange. If that IS | |
543 | * the case we should return zero to let someone else try. | |
544 | * | |
130c6b98 RK |
545 | * Return: 'true' @bdev is a dynamic disk |
546 | * 'false' @bdev is not a dynamic disk, or an error occurred | |
1da177e4 | 547 | */ |
130c6b98 | 548 | static bool ldm_validate_partition_table (struct block_device *bdev) |
1da177e4 LT |
549 | { |
550 | Sector sect; | |
551 | u8 *data; | |
552 | struct partition *p; | |
553 | int i; | |
130c6b98 | 554 | bool result = false; |
1da177e4 LT |
555 | |
556 | BUG_ON (!bdev); | |
557 | ||
558 | data = read_dev_sector (bdev, 0, §); | |
559 | if (!data) { | |
560 | ldm_crit ("Disk read failed."); | |
130c6b98 | 561 | return false; |
1da177e4 LT |
562 | } |
563 | ||
564 | if (*(__le16*) (data + 0x01FE) != cpu_to_le16 (MSDOS_LABEL_MAGIC)) | |
565 | goto out; | |
566 | ||
567 | p = (struct partition*)(data + 0x01BE); | |
568 | for (i = 0; i < 4; i++, p++) | |
569 | if (SYS_IND (p) == WIN2K_DYNAMIC_PARTITION) { | |
130c6b98 | 570 | result = true; |
1da177e4 LT |
571 | break; |
572 | } | |
573 | ||
574 | if (result) | |
575 | ldm_debug ("Found W2K dynamic disk partition type."); | |
576 | ||
577 | out: | |
578 | put_dev_sector (sect); | |
579 | return result; | |
580 | } | |
581 | ||
582 | /** | |
583 | * ldm_get_disk_objid - Search a linked list of vblk's for a given Disk Id | |
584 | * @ldb: Cache of the database structures | |
585 | * | |
586 | * The LDM Database contains a list of all partitions on all dynamic disks. | |
587 | * The primary PRIVHEAD, at the beginning of the physical disk, tells us | |
588 | * the GUID of this disk. This function searches for the GUID in a linked | |
589 | * list of vblk's. | |
590 | * | |
591 | * Return: Pointer, A matching vblk was found | |
592 | * NULL, No match, or an error | |
593 | */ | |
594 | static struct vblk * ldm_get_disk_objid (const struct ldmdb *ldb) | |
595 | { | |
596 | struct list_head *item; | |
597 | ||
598 | BUG_ON (!ldb); | |
599 | ||
600 | list_for_each (item, &ldb->v_disk) { | |
601 | struct vblk *v = list_entry (item, struct vblk, list); | |
602 | if (!memcmp (v->vblk.disk.disk_id, ldb->ph.disk_id, GUID_SIZE)) | |
603 | return v; | |
604 | } | |
605 | ||
606 | return NULL; | |
607 | } | |
608 | ||
609 | /** | |
610 | * ldm_create_data_partitions - Create data partitions for this device | |
611 | * @pp: List of the partitions parsed so far | |
612 | * @ldb: Cache of the database structures | |
613 | * | |
614 | * The database contains ALL the partitions for ALL disk groups, so we need to | |
615 | * filter out this specific disk. Using the disk's object id, we can find all | |
616 | * the partitions in the database that belong to this disk. | |
617 | * | |
618 | * Add each partition in our database, to the parsed_partitions structure. | |
619 | * | |
620 | * N.B. This function creates the partitions in the order it finds partition | |
621 | * objects in the linked list. | |
622 | * | |
130c6b98 RK |
623 | * Return: 'true' Partition created |
624 | * 'false' Error, probably a range checking problem | |
1da177e4 | 625 | */ |
130c6b98 | 626 | static bool ldm_create_data_partitions (struct parsed_partitions *pp, |
1da177e4 LT |
627 | const struct ldmdb *ldb) |
628 | { | |
629 | struct list_head *item; | |
630 | struct vblk *vb; | |
631 | struct vblk *disk; | |
632 | struct vblk_part *part; | |
633 | int part_num = 1; | |
634 | ||
635 | BUG_ON (!pp || !ldb); | |
636 | ||
637 | disk = ldm_get_disk_objid (ldb); | |
638 | if (!disk) { | |
639 | ldm_crit ("Can't find the ID of this disk in the database."); | |
130c6b98 | 640 | return false; |
1da177e4 LT |
641 | } |
642 | ||
643 | printk (" [LDM]"); | |
644 | ||
645 | /* Create the data partitions */ | |
646 | list_for_each (item, &ldb->v_part) { | |
647 | vb = list_entry (item, struct vblk, list); | |
648 | part = &vb->vblk.part; | |
649 | ||
650 | if (part->disk_id != disk->obj_id) | |
651 | continue; | |
652 | ||
653 | put_partition (pp, part_num, ldb->ph.logical_disk_start + | |
654 | part->start, part->size); | |
655 | part_num++; | |
656 | } | |
657 | ||
658 | printk ("\n"); | |
130c6b98 | 659 | return true; |
1da177e4 LT |
660 | } |
661 | ||
662 | ||
663 | /** | |
664 | * ldm_relative - Calculate the next relative offset | |
665 | * @buffer: Block of data being worked on | |
666 | * @buflen: Size of the block of data | |
667 | * @base: Size of the previous fixed width fields | |
668 | * @offset: Cumulative size of the previous variable-width fields | |
669 | * | |
670 | * Because many of the VBLK fields are variable-width, it's necessary | |
671 | * to calculate each offset based on the previous one and the length | |
672 | * of the field it pointed to. | |
673 | * | |
674 | * Return: -1 Error, the calculated offset exceeded the size of the buffer | |
675 | * n OK, a range-checked offset into buffer | |
676 | */ | |
677 | static int ldm_relative (const u8 *buffer, int buflen, int base, int offset) | |
678 | { | |
679 | ||
680 | base += offset; | |
681 | if ((!buffer) || (offset < 0) || (base > buflen)) | |
682 | return -1; | |
683 | if ((base + buffer[base]) >= buflen) | |
684 | return -1; | |
685 | ||
686 | return buffer[base] + offset + 1; | |
687 | } | |
688 | ||
689 | /** | |
690 | * ldm_get_vnum - Convert a variable-width, big endian number, into cpu order | |
691 | * @block: Pointer to the variable-width number to convert | |
692 | * | |
693 | * Large numbers in the LDM Database are often stored in a packed format. Each | |
694 | * number is prefixed by a one byte width marker. All numbers in the database | |
695 | * are stored in big-endian byte order. This function reads one of these | |
696 | * numbers and returns the result | |
697 | * | |
698 | * N.B. This function DOES NOT perform any range checking, though the most | |
699 | * it will read is eight bytes. | |
700 | * | |
701 | * Return: n A number | |
702 | * 0 Zero, or an error occurred | |
703 | */ | |
704 | static u64 ldm_get_vnum (const u8 *block) | |
705 | { | |
706 | u64 tmp = 0; | |
707 | u8 length; | |
708 | ||
709 | BUG_ON (!block); | |
710 | ||
711 | length = *block++; | |
712 | ||
713 | if (length && length <= 8) | |
714 | while (length--) | |
715 | tmp = (tmp << 8) | *block++; | |
716 | else | |
717 | ldm_error ("Illegal length %d.", length); | |
718 | ||
719 | return tmp; | |
720 | } | |
721 | ||
722 | /** | |
723 | * ldm_get_vstr - Read a length-prefixed string into a buffer | |
724 | * @block: Pointer to the length marker | |
725 | * @buffer: Location to copy string to | |
726 | * @buflen: Size of the output buffer | |
727 | * | |
728 | * Many of the strings in the LDM Database are not NULL terminated. Instead | |
729 | * they are prefixed by a one byte length marker. This function copies one of | |
730 | * these strings into a buffer. | |
731 | * | |
732 | * N.B. This function DOES NOT perform any range checking on the input. | |
733 | * If the buffer is too small, the output will be truncated. | |
734 | * | |
735 | * Return: 0, Error and @buffer contents are undefined | |
736 | * n, String length in characters (excluding NULL) | |
737 | * buflen-1, String was truncated. | |
738 | */ | |
739 | static int ldm_get_vstr (const u8 *block, u8 *buffer, int buflen) | |
740 | { | |
741 | int length; | |
742 | ||
743 | BUG_ON (!block || !buffer); | |
744 | ||
745 | length = block[0]; | |
746 | if (length >= buflen) { | |
747 | ldm_error ("Truncating string %d -> %d.", length, buflen); | |
748 | length = buflen - 1; | |
749 | } | |
750 | memcpy (buffer, block + 1, length); | |
751 | buffer[length] = 0; | |
752 | return length; | |
753 | } | |
754 | ||
755 | ||
756 | /** | |
757 | * ldm_parse_cmp3 - Read a raw VBLK Component object into a vblk structure | |
758 | * @buffer: Block of data being worked on | |
759 | * @buflen: Size of the block of data | |
760 | * @vb: In-memory vblk in which to return information | |
761 | * | |
762 | * Read a raw VBLK Component object (version 3) into a vblk structure. | |
763 | * | |
130c6b98 RK |
764 | * Return: 'true' @vb contains a Component VBLK |
765 | * 'false' @vb contents are not defined | |
1da177e4 | 766 | */ |
130c6b98 | 767 | static bool ldm_parse_cmp3 (const u8 *buffer, int buflen, struct vblk *vb) |
1da177e4 LT |
768 | { |
769 | int r_objid, r_name, r_vstate, r_child, r_parent, r_stripe, r_cols, len; | |
770 | struct vblk_comp *comp; | |
771 | ||
772 | BUG_ON (!buffer || !vb); | |
773 | ||
774 | r_objid = ldm_relative (buffer, buflen, 0x18, 0); | |
775 | r_name = ldm_relative (buffer, buflen, 0x18, r_objid); | |
776 | r_vstate = ldm_relative (buffer, buflen, 0x18, r_name); | |
777 | r_child = ldm_relative (buffer, buflen, 0x1D, r_vstate); | |
778 | r_parent = ldm_relative (buffer, buflen, 0x2D, r_child); | |
779 | ||
780 | if (buffer[0x12] & VBLK_FLAG_COMP_STRIPE) { | |
781 | r_stripe = ldm_relative (buffer, buflen, 0x2E, r_parent); | |
782 | r_cols = ldm_relative (buffer, buflen, 0x2E, r_stripe); | |
783 | len = r_cols; | |
784 | } else { | |
785 | r_stripe = 0; | |
786 | r_cols = 0; | |
787 | len = r_parent; | |
788 | } | |
789 | if (len < 0) | |
130c6b98 | 790 | return false; |
1da177e4 LT |
791 | |
792 | len += VBLK_SIZE_CMP3; | |
793 | if (len != BE32 (buffer + 0x14)) | |
130c6b98 | 794 | return false; |
1da177e4 LT |
795 | |
796 | comp = &vb->vblk.comp; | |
797 | ldm_get_vstr (buffer + 0x18 + r_name, comp->state, | |
798 | sizeof (comp->state)); | |
799 | comp->type = buffer[0x18 + r_vstate]; | |
800 | comp->children = ldm_get_vnum (buffer + 0x1D + r_vstate); | |
801 | comp->parent_id = ldm_get_vnum (buffer + 0x2D + r_child); | |
802 | comp->chunksize = r_stripe ? ldm_get_vnum (buffer+r_parent+0x2E) : 0; | |
803 | ||
130c6b98 | 804 | return true; |
1da177e4 LT |
805 | } |
806 | ||
807 | /** | |
808 | * ldm_parse_dgr3 - Read a raw VBLK Disk Group object into a vblk structure | |
809 | * @buffer: Block of data being worked on | |
810 | * @buflen: Size of the block of data | |
811 | * @vb: In-memory vblk in which to return information | |
812 | * | |
813 | * Read a raw VBLK Disk Group object (version 3) into a vblk structure. | |
814 | * | |
130c6b98 RK |
815 | * Return: 'true' @vb contains a Disk Group VBLK |
816 | * 'false' @vb contents are not defined | |
1da177e4 LT |
817 | */ |
818 | static int ldm_parse_dgr3 (const u8 *buffer, int buflen, struct vblk *vb) | |
819 | { | |
820 | int r_objid, r_name, r_diskid, r_id1, r_id2, len; | |
821 | struct vblk_dgrp *dgrp; | |
822 | ||
823 | BUG_ON (!buffer || !vb); | |
824 | ||
825 | r_objid = ldm_relative (buffer, buflen, 0x18, 0); | |
826 | r_name = ldm_relative (buffer, buflen, 0x18, r_objid); | |
827 | r_diskid = ldm_relative (buffer, buflen, 0x18, r_name); | |
828 | ||
829 | if (buffer[0x12] & VBLK_FLAG_DGR3_IDS) { | |
830 | r_id1 = ldm_relative (buffer, buflen, 0x24, r_diskid); | |
831 | r_id2 = ldm_relative (buffer, buflen, 0x24, r_id1); | |
832 | len = r_id2; | |
833 | } else { | |
834 | r_id1 = 0; | |
835 | r_id2 = 0; | |
836 | len = r_diskid; | |
837 | } | |
838 | if (len < 0) | |
130c6b98 | 839 | return false; |
1da177e4 LT |
840 | |
841 | len += VBLK_SIZE_DGR3; | |
842 | if (len != BE32 (buffer + 0x14)) | |
130c6b98 | 843 | return false; |
1da177e4 LT |
844 | |
845 | dgrp = &vb->vblk.dgrp; | |
846 | ldm_get_vstr (buffer + 0x18 + r_name, dgrp->disk_id, | |
847 | sizeof (dgrp->disk_id)); | |
130c6b98 | 848 | return true; |
1da177e4 LT |
849 | } |
850 | ||
851 | /** | |
852 | * ldm_parse_dgr4 - Read a raw VBLK Disk Group object into a vblk structure | |
853 | * @buffer: Block of data being worked on | |
854 | * @buflen: Size of the block of data | |
855 | * @vb: In-memory vblk in which to return information | |
856 | * | |
857 | * Read a raw VBLK Disk Group object (version 4) into a vblk structure. | |
858 | * | |
130c6b98 RK |
859 | * Return: 'true' @vb contains a Disk Group VBLK |
860 | * 'false' @vb contents are not defined | |
1da177e4 | 861 | */ |
130c6b98 | 862 | static bool ldm_parse_dgr4 (const u8 *buffer, int buflen, struct vblk *vb) |
1da177e4 LT |
863 | { |
864 | char buf[64]; | |
865 | int r_objid, r_name, r_id1, r_id2, len; | |
866 | struct vblk_dgrp *dgrp; | |
867 | ||
868 | BUG_ON (!buffer || !vb); | |
869 | ||
870 | r_objid = ldm_relative (buffer, buflen, 0x18, 0); | |
871 | r_name = ldm_relative (buffer, buflen, 0x18, r_objid); | |
872 | ||
873 | if (buffer[0x12] & VBLK_FLAG_DGR4_IDS) { | |
874 | r_id1 = ldm_relative (buffer, buflen, 0x44, r_name); | |
875 | r_id2 = ldm_relative (buffer, buflen, 0x44, r_id1); | |
876 | len = r_id2; | |
877 | } else { | |
878 | r_id1 = 0; | |
879 | r_id2 = 0; | |
880 | len = r_name; | |
881 | } | |
882 | if (len < 0) | |
130c6b98 | 883 | return false; |
1da177e4 LT |
884 | |
885 | len += VBLK_SIZE_DGR4; | |
886 | if (len != BE32 (buffer + 0x14)) | |
130c6b98 | 887 | return false; |
1da177e4 LT |
888 | |
889 | dgrp = &vb->vblk.dgrp; | |
890 | ||
891 | ldm_get_vstr (buffer + 0x18 + r_objid, buf, sizeof (buf)); | |
130c6b98 | 892 | return true; |
1da177e4 LT |
893 | } |
894 | ||
895 | /** | |
896 | * ldm_parse_dsk3 - Read a raw VBLK Disk object into a vblk structure | |
897 | * @buffer: Block of data being worked on | |
898 | * @buflen: Size of the block of data | |
899 | * @vb: In-memory vblk in which to return information | |
900 | * | |
901 | * Read a raw VBLK Disk object (version 3) into a vblk structure. | |
902 | * | |
130c6b98 RK |
903 | * Return: 'true' @vb contains a Disk VBLK |
904 | * 'false' @vb contents are not defined | |
1da177e4 | 905 | */ |
130c6b98 | 906 | static bool ldm_parse_dsk3 (const u8 *buffer, int buflen, struct vblk *vb) |
1da177e4 LT |
907 | { |
908 | int r_objid, r_name, r_diskid, r_altname, len; | |
909 | struct vblk_disk *disk; | |
910 | ||
911 | BUG_ON (!buffer || !vb); | |
912 | ||
913 | r_objid = ldm_relative (buffer, buflen, 0x18, 0); | |
914 | r_name = ldm_relative (buffer, buflen, 0x18, r_objid); | |
915 | r_diskid = ldm_relative (buffer, buflen, 0x18, r_name); | |
916 | r_altname = ldm_relative (buffer, buflen, 0x18, r_diskid); | |
917 | len = r_altname; | |
918 | if (len < 0) | |
130c6b98 | 919 | return false; |
1da177e4 LT |
920 | |
921 | len += VBLK_SIZE_DSK3; | |
922 | if (len != BE32 (buffer + 0x14)) | |
130c6b98 | 923 | return false; |
1da177e4 LT |
924 | |
925 | disk = &vb->vblk.disk; | |
926 | ldm_get_vstr (buffer + 0x18 + r_diskid, disk->alt_name, | |
927 | sizeof (disk->alt_name)); | |
928 | if (!ldm_parse_guid (buffer + 0x19 + r_name, disk->disk_id)) | |
130c6b98 | 929 | return false; |
1da177e4 | 930 | |
130c6b98 | 931 | return true; |
1da177e4 LT |
932 | } |
933 | ||
934 | /** | |
935 | * ldm_parse_dsk4 - Read a raw VBLK Disk object into a vblk structure | |
936 | * @buffer: Block of data being worked on | |
937 | * @buflen: Size of the block of data | |
938 | * @vb: In-memory vblk in which to return information | |
939 | * | |
940 | * Read a raw VBLK Disk object (version 4) into a vblk structure. | |
941 | * | |
130c6b98 RK |
942 | * Return: 'true' @vb contains a Disk VBLK |
943 | * 'false' @vb contents are not defined | |
1da177e4 | 944 | */ |
130c6b98 | 945 | static bool ldm_parse_dsk4 (const u8 *buffer, int buflen, struct vblk *vb) |
1da177e4 LT |
946 | { |
947 | int r_objid, r_name, len; | |
948 | struct vblk_disk *disk; | |
949 | ||
950 | BUG_ON (!buffer || !vb); | |
951 | ||
952 | r_objid = ldm_relative (buffer, buflen, 0x18, 0); | |
953 | r_name = ldm_relative (buffer, buflen, 0x18, r_objid); | |
954 | len = r_name; | |
955 | if (len < 0) | |
130c6b98 | 956 | return false; |
1da177e4 LT |
957 | |
958 | len += VBLK_SIZE_DSK4; | |
959 | if (len != BE32 (buffer + 0x14)) | |
130c6b98 | 960 | return false; |
1da177e4 LT |
961 | |
962 | disk = &vb->vblk.disk; | |
963 | memcpy (disk->disk_id, buffer + 0x18 + r_name, GUID_SIZE); | |
130c6b98 | 964 | return true; |
1da177e4 LT |
965 | } |
966 | ||
967 | /** | |
968 | * ldm_parse_prt3 - Read a raw VBLK Partition object into a vblk structure | |
969 | * @buffer: Block of data being worked on | |
970 | * @buflen: Size of the block of data | |
971 | * @vb: In-memory vblk in which to return information | |
972 | * | |
973 | * Read a raw VBLK Partition object (version 3) into a vblk structure. | |
974 | * | |
130c6b98 RK |
975 | * Return: 'true' @vb contains a Partition VBLK |
976 | * 'false' @vb contents are not defined | |
1da177e4 | 977 | */ |
130c6b98 | 978 | static bool ldm_parse_prt3 (const u8 *buffer, int buflen, struct vblk *vb) |
1da177e4 LT |
979 | { |
980 | int r_objid, r_name, r_size, r_parent, r_diskid, r_index, len; | |
981 | struct vblk_part *part; | |
982 | ||
983 | BUG_ON (!buffer || !vb); | |
984 | ||
985 | r_objid = ldm_relative (buffer, buflen, 0x18, 0); | |
986 | r_name = ldm_relative (buffer, buflen, 0x18, r_objid); | |
987 | r_size = ldm_relative (buffer, buflen, 0x34, r_name); | |
988 | r_parent = ldm_relative (buffer, buflen, 0x34, r_size); | |
989 | r_diskid = ldm_relative (buffer, buflen, 0x34, r_parent); | |
990 | ||
991 | if (buffer[0x12] & VBLK_FLAG_PART_INDEX) { | |
992 | r_index = ldm_relative (buffer, buflen, 0x34, r_diskid); | |
993 | len = r_index; | |
994 | } else { | |
995 | r_index = 0; | |
996 | len = r_diskid; | |
997 | } | |
998 | if (len < 0) | |
130c6b98 | 999 | return false; |
1da177e4 LT |
1000 | |
1001 | len += VBLK_SIZE_PRT3; | |
1002 | if (len != BE32 (buffer + 0x14)) | |
130c6b98 | 1003 | return false; |
1da177e4 LT |
1004 | |
1005 | part = &vb->vblk.part; | |
1006 | part->start = BE64 (buffer + 0x24 + r_name); | |
1007 | part->volume_offset = BE64 (buffer + 0x2C + r_name); | |
1008 | part->size = ldm_get_vnum (buffer + 0x34 + r_name); | |
1009 | part->parent_id = ldm_get_vnum (buffer + 0x34 + r_size); | |
1010 | part->disk_id = ldm_get_vnum (buffer + 0x34 + r_parent); | |
1011 | if (vb->flags & VBLK_FLAG_PART_INDEX) | |
1012 | part->partnum = buffer[0x35 + r_diskid]; | |
1013 | else | |
1014 | part->partnum = 0; | |
1015 | ||
130c6b98 | 1016 | return true; |
1da177e4 LT |
1017 | } |
1018 | ||
1019 | /** | |
1020 | * ldm_parse_vol5 - Read a raw VBLK Volume object into a vblk structure | |
1021 | * @buffer: Block of data being worked on | |
1022 | * @buflen: Size of the block of data | |
1023 | * @vb: In-memory vblk in which to return information | |
1024 | * | |
1025 | * Read a raw VBLK Volume object (version 5) into a vblk structure. | |
1026 | * | |
130c6b98 RK |
1027 | * Return: 'true' @vb contains a Volume VBLK |
1028 | * 'false' @vb contents are not defined | |
1da177e4 | 1029 | */ |
130c6b98 | 1030 | static bool ldm_parse_vol5 (const u8 *buffer, int buflen, struct vblk *vb) |
1da177e4 LT |
1031 | { |
1032 | int r_objid, r_name, r_vtype, r_child, r_size, r_id1, r_id2, r_size2; | |
1033 | int r_drive, len; | |
1034 | struct vblk_volu *volu; | |
1035 | ||
1036 | BUG_ON (!buffer || !vb); | |
1037 | ||
1038 | r_objid = ldm_relative (buffer, buflen, 0x18, 0); | |
1039 | r_name = ldm_relative (buffer, buflen, 0x18, r_objid); | |
1040 | r_vtype = ldm_relative (buffer, buflen, 0x18, r_name); | |
1041 | r_child = ldm_relative (buffer, buflen, 0x2E, r_vtype); | |
1042 | r_size = ldm_relative (buffer, buflen, 0x3E, r_child); | |
1043 | ||
1044 | if (buffer[0x12] & VBLK_FLAG_VOLU_ID1) | |
1045 | r_id1 = ldm_relative (buffer, buflen, 0x53, r_size); | |
1046 | else | |
1047 | r_id1 = r_size; | |
1048 | ||
1049 | if (buffer[0x12] & VBLK_FLAG_VOLU_ID2) | |
1050 | r_id2 = ldm_relative (buffer, buflen, 0x53, r_id1); | |
1051 | else | |
1052 | r_id2 = r_id1; | |
1053 | ||
1054 | if (buffer[0x12] & VBLK_FLAG_VOLU_SIZE) | |
1055 | r_size2 = ldm_relative (buffer, buflen, 0x53, r_id2); | |
1056 | else | |
1057 | r_size2 = r_id2; | |
1058 | ||
1059 | if (buffer[0x12] & VBLK_FLAG_VOLU_DRIVE) | |
1060 | r_drive = ldm_relative (buffer, buflen, 0x53, r_size2); | |
1061 | else | |
1062 | r_drive = r_size2; | |
1063 | ||
1064 | len = r_drive; | |
1065 | if (len < 0) | |
130c6b98 | 1066 | return false; |
1da177e4 LT |
1067 | |
1068 | len += VBLK_SIZE_VOL5; | |
1069 | if (len != BE32 (buffer + 0x14)) | |
130c6b98 | 1070 | return false; |
1da177e4 LT |
1071 | |
1072 | volu = &vb->vblk.volu; | |
1073 | ||
1074 | ldm_get_vstr (buffer + 0x18 + r_name, volu->volume_type, | |
1075 | sizeof (volu->volume_type)); | |
1076 | memcpy (volu->volume_state, buffer + 0x19 + r_vtype, | |
1077 | sizeof (volu->volume_state)); | |
1078 | volu->size = ldm_get_vnum (buffer + 0x3E + r_child); | |
1079 | volu->partition_type = buffer[0x42 + r_size]; | |
1080 | memcpy (volu->guid, buffer + 0x43 + r_size, sizeof (volu->guid)); | |
1081 | if (buffer[0x12] & VBLK_FLAG_VOLU_DRIVE) { | |
1082 | ldm_get_vstr (buffer + 0x53 + r_size, volu->drive_hint, | |
1083 | sizeof (volu->drive_hint)); | |
1084 | } | |
130c6b98 | 1085 | return true; |
1da177e4 LT |
1086 | } |
1087 | ||
1088 | /** | |
1089 | * ldm_parse_vblk - Read a raw VBLK object into a vblk structure | |
1090 | * @buf: Block of data being worked on | |
1091 | * @len: Size of the block of data | |
1092 | * @vb: In-memory vblk in which to return information | |
1093 | * | |
1094 | * Read a raw VBLK object into a vblk structure. This function just reads the | |
1095 | * information common to all VBLK types, then delegates the rest of the work to | |
1096 | * helper functions: ldm_parse_*. | |
1097 | * | |
130c6b98 RK |
1098 | * Return: 'true' @vb contains a VBLK |
1099 | * 'false' @vb contents are not defined | |
1da177e4 | 1100 | */ |
130c6b98 | 1101 | static bool ldm_parse_vblk (const u8 *buf, int len, struct vblk *vb) |
1da177e4 | 1102 | { |
130c6b98 | 1103 | bool result = false; |
1da177e4 LT |
1104 | int r_objid; |
1105 | ||
1106 | BUG_ON (!buf || !vb); | |
1107 | ||
1108 | r_objid = ldm_relative (buf, len, 0x18, 0); | |
1109 | if (r_objid < 0) { | |
1110 | ldm_error ("VBLK header is corrupt."); | |
130c6b98 | 1111 | return false; |
1da177e4 LT |
1112 | } |
1113 | ||
1114 | vb->flags = buf[0x12]; | |
1115 | vb->type = buf[0x13]; | |
1116 | vb->obj_id = ldm_get_vnum (buf + 0x18); | |
1117 | ldm_get_vstr (buf+0x18+r_objid, vb->name, sizeof (vb->name)); | |
1118 | ||
1119 | switch (vb->type) { | |
1120 | case VBLK_CMP3: result = ldm_parse_cmp3 (buf, len, vb); break; | |
1121 | case VBLK_DSK3: result = ldm_parse_dsk3 (buf, len, vb); break; | |
1122 | case VBLK_DSK4: result = ldm_parse_dsk4 (buf, len, vb); break; | |
1123 | case VBLK_DGR3: result = ldm_parse_dgr3 (buf, len, vb); break; | |
1124 | case VBLK_DGR4: result = ldm_parse_dgr4 (buf, len, vb); break; | |
1125 | case VBLK_PRT3: result = ldm_parse_prt3 (buf, len, vb); break; | |
1126 | case VBLK_VOL5: result = ldm_parse_vol5 (buf, len, vb); break; | |
1127 | } | |
1128 | ||
1129 | if (result) | |
1130 | ldm_debug ("Parsed VBLK 0x%llx (type: 0x%02x) ok.", | |
1131 | (unsigned long long) vb->obj_id, vb->type); | |
1132 | else | |
1133 | ldm_error ("Failed to parse VBLK 0x%llx (type: 0x%02x).", | |
1134 | (unsigned long long) vb->obj_id, vb->type); | |
1135 | ||
1136 | return result; | |
1137 | } | |
1138 | ||
1139 | ||
1140 | /** | |
1141 | * ldm_ldmdb_add - Adds a raw VBLK entry to the ldmdb database | |
1142 | * @data: Raw VBLK to add to the database | |
1143 | * @len: Size of the raw VBLK | |
1144 | * @ldb: Cache of the database structures | |
1145 | * | |
1146 | * The VBLKs are sorted into categories. Partitions are also sorted by offset. | |
1147 | * | |
1148 | * N.B. This function does not check the validity of the VBLKs. | |
1149 | * | |
130c6b98 RK |
1150 | * Return: 'true' The VBLK was added |
1151 | * 'false' An error occurred | |
1da177e4 | 1152 | */ |
130c6b98 | 1153 | static bool ldm_ldmdb_add (u8 *data, int len, struct ldmdb *ldb) |
1da177e4 LT |
1154 | { |
1155 | struct vblk *vb; | |
1156 | struct list_head *item; | |
1157 | ||
1158 | BUG_ON (!data || !ldb); | |
1159 | ||
1160 | vb = kmalloc (sizeof (*vb), GFP_KERNEL); | |
1161 | if (!vb) { | |
1162 | ldm_crit ("Out of memory."); | |
130c6b98 | 1163 | return false; |
1da177e4 LT |
1164 | } |
1165 | ||
1166 | if (!ldm_parse_vblk (data, len, vb)) { | |
1167 | kfree(vb); | |
130c6b98 | 1168 | return false; /* Already logged */ |
1da177e4 LT |
1169 | } |
1170 | ||
1171 | /* Put vblk into the correct list. */ | |
1172 | switch (vb->type) { | |
1173 | case VBLK_DGR3: | |
1174 | case VBLK_DGR4: | |
1175 | list_add (&vb->list, &ldb->v_dgrp); | |
1176 | break; | |
1177 | case VBLK_DSK3: | |
1178 | case VBLK_DSK4: | |
1179 | list_add (&vb->list, &ldb->v_disk); | |
1180 | break; | |
1181 | case VBLK_VOL5: | |
1182 | list_add (&vb->list, &ldb->v_volu); | |
1183 | break; | |
1184 | case VBLK_CMP3: | |
1185 | list_add (&vb->list, &ldb->v_comp); | |
1186 | break; | |
1187 | case VBLK_PRT3: | |
1188 | /* Sort by the partition's start sector. */ | |
1189 | list_for_each (item, &ldb->v_part) { | |
1190 | struct vblk *v = list_entry (item, struct vblk, list); | |
1191 | if ((v->vblk.part.disk_id == vb->vblk.part.disk_id) && | |
1192 | (v->vblk.part.start > vb->vblk.part.start)) { | |
1193 | list_add_tail (&vb->list, &v->list); | |
130c6b98 | 1194 | return true; |
1da177e4 LT |
1195 | } |
1196 | } | |
1197 | list_add_tail (&vb->list, &ldb->v_part); | |
1198 | break; | |
1199 | } | |
130c6b98 | 1200 | return true; |
1da177e4 LT |
1201 | } |
1202 | ||
1203 | /** | |
1204 | * ldm_frag_add - Add a VBLK fragment to a list | |
1205 | * @data: Raw fragment to be added to the list | |
1206 | * @size: Size of the raw fragment | |
1207 | * @frags: Linked list of VBLK fragments | |
1208 | * | |
1209 | * Fragmented VBLKs may not be consecutive in the database, so they are placed | |
1210 | * in a list so they can be pieced together later. | |
1211 | * | |
130c6b98 RK |
1212 | * Return: 'true' Success, the VBLK was added to the list |
1213 | * 'false' Error, a problem occurred | |
1da177e4 | 1214 | */ |
130c6b98 | 1215 | static bool ldm_frag_add (const u8 *data, int size, struct list_head *frags) |
1da177e4 LT |
1216 | { |
1217 | struct frag *f; | |
1218 | struct list_head *item; | |
1219 | int rec, num, group; | |
1220 | ||
1221 | BUG_ON (!data || !frags); | |
1222 | ||
1223 | group = BE32 (data + 0x08); | |
1224 | rec = BE16 (data + 0x0C); | |
1225 | num = BE16 (data + 0x0E); | |
1226 | if ((num < 1) || (num > 4)) { | |
1227 | ldm_error ("A VBLK claims to have %d parts.", num); | |
130c6b98 | 1228 | return false; |
1da177e4 LT |
1229 | } |
1230 | ||
1231 | list_for_each (item, frags) { | |
1232 | f = list_entry (item, struct frag, list); | |
1233 | if (f->group == group) | |
1234 | goto found; | |
1235 | } | |
1236 | ||
1237 | f = kmalloc (sizeof (*f) + size*num, GFP_KERNEL); | |
1238 | if (!f) { | |
1239 | ldm_crit ("Out of memory."); | |
130c6b98 | 1240 | return false; |
1da177e4 LT |
1241 | } |
1242 | ||
1243 | f->group = group; | |
1244 | f->num = num; | |
1245 | f->rec = rec; | |
1246 | f->map = 0xFF << num; | |
1247 | ||
1248 | list_add_tail (&f->list, frags); | |
1249 | found: | |
1250 | if (f->map & (1 << rec)) { | |
1251 | ldm_error ("Duplicate VBLK, part %d.", rec); | |
1252 | f->map &= 0x7F; /* Mark the group as broken */ | |
130c6b98 | 1253 | return false; |
1da177e4 LT |
1254 | } |
1255 | ||
1256 | f->map |= (1 << rec); | |
1257 | ||
1258 | if (num > 0) { | |
1259 | data += VBLK_SIZE_HEAD; | |
1260 | size -= VBLK_SIZE_HEAD; | |
1261 | } | |
1262 | memcpy (f->data+rec*(size-VBLK_SIZE_HEAD)+VBLK_SIZE_HEAD, data, size); | |
1263 | ||
130c6b98 | 1264 | return true; |
1da177e4 LT |
1265 | } |
1266 | ||
1267 | /** | |
1268 | * ldm_frag_free - Free a linked list of VBLK fragments | |
1269 | * @list: Linked list of fragments | |
1270 | * | |
1271 | * Free a linked list of VBLK fragments | |
1272 | * | |
1273 | * Return: none | |
1274 | */ | |
1275 | static void ldm_frag_free (struct list_head *list) | |
1276 | { | |
1277 | struct list_head *item, *tmp; | |
1278 | ||
1279 | BUG_ON (!list); | |
1280 | ||
1281 | list_for_each_safe (item, tmp, list) | |
1282 | kfree (list_entry (item, struct frag, list)); | |
1283 | } | |
1284 | ||
1285 | /** | |
1286 | * ldm_frag_commit - Validate fragmented VBLKs and add them to the database | |
1287 | * @frags: Linked list of VBLK fragments | |
1288 | * @ldb: Cache of the database structures | |
1289 | * | |
1290 | * Now that all the fragmented VBLKs have been collected, they must be added to | |
1291 | * the database for later use. | |
1292 | * | |
130c6b98 RK |
1293 | * Return: 'true' All the fragments we added successfully |
1294 | * 'false' One or more of the fragments we invalid | |
1da177e4 | 1295 | */ |
130c6b98 | 1296 | static bool ldm_frag_commit (struct list_head *frags, struct ldmdb *ldb) |
1da177e4 LT |
1297 | { |
1298 | struct frag *f; | |
1299 | struct list_head *item; | |
1300 | ||
1301 | BUG_ON (!frags || !ldb); | |
1302 | ||
1303 | list_for_each (item, frags) { | |
1304 | f = list_entry (item, struct frag, list); | |
1305 | ||
1306 | if (f->map != 0xFF) { | |
1307 | ldm_error ("VBLK group %d is incomplete (0x%02x).", | |
1308 | f->group, f->map); | |
130c6b98 | 1309 | return false; |
1da177e4 LT |
1310 | } |
1311 | ||
1312 | if (!ldm_ldmdb_add (f->data, f->num*ldb->vm.vblk_size, ldb)) | |
130c6b98 | 1313 | return false; /* Already logged */ |
1da177e4 | 1314 | } |
130c6b98 | 1315 | return true; |
1da177e4 LT |
1316 | } |
1317 | ||
1318 | /** | |
1319 | * ldm_get_vblks - Read the on-disk database of VBLKs into memory | |
1320 | * @bdev: Device holding the LDM Database | |
1321 | * @base: Offset, into @bdev, of the database | |
1322 | * @ldb: Cache of the database structures | |
1323 | * | |
1324 | * To use the information from the VBLKs, they need to be read from the disk, | |
1325 | * unpacked and validated. We cache them in @ldb according to their type. | |
1326 | * | |
130c6b98 RK |
1327 | * Return: 'true' All the VBLKs were read successfully |
1328 | * 'false' An error occurred | |
1da177e4 | 1329 | */ |
130c6b98 | 1330 | static bool ldm_get_vblks (struct block_device *bdev, unsigned long base, |
1da177e4 LT |
1331 | struct ldmdb *ldb) |
1332 | { | |
1333 | int size, perbuf, skip, finish, s, v, recs; | |
1334 | u8 *data = NULL; | |
1335 | Sector sect; | |
130c6b98 | 1336 | bool result = false; |
1da177e4 LT |
1337 | LIST_HEAD (frags); |
1338 | ||
1339 | BUG_ON (!bdev || !ldb); | |
1340 | ||
1341 | size = ldb->vm.vblk_size; | |
1342 | perbuf = 512 / size; | |
1343 | skip = ldb->vm.vblk_offset >> 9; /* Bytes to sectors */ | |
1344 | finish = (size * ldb->vm.last_vblk_seq) >> 9; | |
1345 | ||
1346 | for (s = skip; s < finish; s++) { /* For each sector */ | |
1347 | data = read_dev_sector (bdev, base + OFF_VMDB + s, §); | |
1348 | if (!data) { | |
1349 | ldm_crit ("Disk read failed."); | |
1350 | goto out; | |
1351 | } | |
1352 | ||
1353 | for (v = 0; v < perbuf; v++, data+=size) { /* For each vblk */ | |
1354 | if (MAGIC_VBLK != BE32 (data)) { | |
1355 | ldm_error ("Expected to find a VBLK."); | |
1356 | goto out; | |
1357 | } | |
1358 | ||
1359 | recs = BE16 (data + 0x0E); /* Number of records */ | |
1360 | if (recs == 1) { | |
1361 | if (!ldm_ldmdb_add (data, size, ldb)) | |
1362 | goto out; /* Already logged */ | |
1363 | } else if (recs > 1) { | |
1364 | if (!ldm_frag_add (data, size, &frags)) | |
1365 | goto out; /* Already logged */ | |
1366 | } | |
1367 | /* else Record is not in use, ignore it. */ | |
1368 | } | |
1369 | put_dev_sector (sect); | |
1370 | data = NULL; | |
1371 | } | |
1372 | ||
1373 | result = ldm_frag_commit (&frags, ldb); /* Failures, already logged */ | |
1374 | out: | |
1375 | if (data) | |
1376 | put_dev_sector (sect); | |
1377 | ldm_frag_free (&frags); | |
1378 | ||
1379 | return result; | |
1380 | } | |
1381 | ||
1382 | /** | |
1383 | * ldm_free_vblks - Free a linked list of vblk's | |
1384 | * @lh: Head of a linked list of struct vblk | |
1385 | * | |
1386 | * Free a list of vblk's and free the memory used to maintain the list. | |
1387 | * | |
1388 | * Return: none | |
1389 | */ | |
1390 | static void ldm_free_vblks (struct list_head *lh) | |
1391 | { | |
1392 | struct list_head *item, *tmp; | |
1393 | ||
1394 | BUG_ON (!lh); | |
1395 | ||
1396 | list_for_each_safe (item, tmp, lh) | |
1397 | kfree (list_entry (item, struct vblk, list)); | |
1398 | } | |
1399 | ||
1400 | ||
1401 | /** | |
1402 | * ldm_partition - Find out whether a device is a dynamic disk and handle it | |
1403 | * @pp: List of the partitions parsed so far | |
1404 | * @bdev: Device holding the LDM Database | |
1405 | * | |
1406 | * This determines whether the device @bdev is a dynamic disk and if so creates | |
1407 | * the partitions necessary in the gendisk structure pointed to by @hd. | |
1408 | * | |
1409 | * We create a dummy device 1, which contains the LDM database, and then create | |
1410 | * each partition described by the LDM database in sequence as devices 2+. For | |
1411 | * example, if the device is hda, we would have: hda1: LDM database, hda2, hda3, | |
1412 | * and so on: the actual data containing partitions. | |
1413 | * | |
1414 | * Return: 1 Success, @bdev is a dynamic disk and we handled it | |
1415 | * 0 Success, @bdev is not a dynamic disk | |
1416 | * -1 An error occurred before enough information had been read | |
1417 | * Or @bdev is a dynamic disk, but it may be corrupted | |
1418 | */ | |
1419 | int ldm_partition (struct parsed_partitions *pp, struct block_device *bdev) | |
1420 | { | |
1421 | struct ldmdb *ldb; | |
1422 | unsigned long base; | |
1423 | int result = -1; | |
1424 | ||
1425 | BUG_ON (!pp || !bdev); | |
1426 | ||
1427 | /* Look for signs of a Dynamic Disk */ | |
1428 | if (!ldm_validate_partition_table (bdev)) | |
1429 | return 0; | |
1430 | ||
1431 | ldb = kmalloc (sizeof (*ldb), GFP_KERNEL); | |
1432 | if (!ldb) { | |
1433 | ldm_crit ("Out of memory."); | |
1434 | goto out; | |
1435 | } | |
1436 | ||
1437 | /* Parse and check privheads. */ | |
1438 | if (!ldm_validate_privheads (bdev, &ldb->ph)) | |
1439 | goto out; /* Already logged */ | |
1440 | ||
1441 | /* All further references are relative to base (database start). */ | |
1442 | base = ldb->ph.config_start; | |
1443 | ||
1444 | /* Parse and check tocs and vmdb. */ | |
1445 | if (!ldm_validate_tocblocks (bdev, base, ldb) || | |
1446 | !ldm_validate_vmdb (bdev, base, ldb)) | |
1447 | goto out; /* Already logged */ | |
1448 | ||
1449 | /* Initialize vblk lists in ldmdb struct */ | |
1450 | INIT_LIST_HEAD (&ldb->v_dgrp); | |
1451 | INIT_LIST_HEAD (&ldb->v_disk); | |
1452 | INIT_LIST_HEAD (&ldb->v_volu); | |
1453 | INIT_LIST_HEAD (&ldb->v_comp); | |
1454 | INIT_LIST_HEAD (&ldb->v_part); | |
1455 | ||
1456 | if (!ldm_get_vblks (bdev, base, ldb)) { | |
1457 | ldm_crit ("Failed to read the VBLKs from the database."); | |
1458 | goto cleanup; | |
1459 | } | |
1460 | ||
1461 | /* Finally, create the data partition devices. */ | |
1462 | if (ldm_create_data_partitions (pp, ldb)) { | |
1463 | ldm_debug ("Parsed LDM database successfully."); | |
1464 | result = 1; | |
1465 | } | |
1466 | /* else Already logged */ | |
1467 | ||
1468 | cleanup: | |
1469 | ldm_free_vblks (&ldb->v_dgrp); | |
1470 | ldm_free_vblks (&ldb->v_disk); | |
1471 | ldm_free_vblks (&ldb->v_volu); | |
1472 | ldm_free_vblks (&ldb->v_comp); | |
1473 | ldm_free_vblks (&ldb->v_part); | |
1474 | out: | |
1475 | kfree (ldb); | |
1476 | return result; | |
1477 | } | |
1478 |