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Commit | Line | Data |
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2b002173 | 1 | /* lvm.c - module to read Logical Volumes. */ |
2 | /* | |
3 | * GRUB -- GRand Unified Bootloader | |
5a79f472 | 4 | * Copyright (C) 2006,2007 Free Software Foundation, Inc. |
2b002173 | 5 | * |
5a79f472 | 6 | * GRUB is free software: you can redistribute it and/or modify |
2b002173 | 7 | * it under the terms of the GNU General Public License as published by |
5a79f472 | 8 | * the Free Software Foundation, either version 3 of the License, or |
2b002173 | 9 | * (at your option) any later version. |
10 | * | |
5a79f472 | 11 | * GRUB is distributed in the hope that it will be useful, |
2b002173 | 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
5a79f472 | 17 | * along with GRUB. If not, see <http://www.gnu.org/licenses/>. |
2b002173 | 18 | */ |
19 | ||
20 | #include <grub/dl.h> | |
21 | #include <grub/disk.h> | |
22 | #include <grub/mm.h> | |
23 | #include <grub/err.h> | |
24 | #include <grub/misc.h> | |
25 | #include <grub/lvm.h> | |
26 | ||
4d42b77f | 27 | static struct grub_lvm_vg *vg_list; |
2b002173 | 28 | static int lv_count; |
29 | ||
30 | \f | |
31 | /* Go the string STR and return the number after STR. *P will point | |
7ceeee39 | 32 | at the number. In case STR is not found, *P will be NULL and the |
33 | return value will be 0. */ | |
2b002173 | 34 | static int |
35 | grub_lvm_getvalue (char **p, char *str) | |
36 | { | |
7ceeee39 | 37 | *p = grub_strstr (*p, str); |
38 | if (! *p) | |
39 | return 0; | |
40 | *p += grub_strlen (str); | |
2b002173 | 41 | return grub_strtoul (*p, NULL, 10); |
42 | } | |
43 | ||
44 | static int | |
45 | grub_lvm_iterate (int (*hook) (const char *name)) | |
46 | { | |
47 | struct grub_lvm_vg *vg; | |
4d42b77f | 48 | for (vg = vg_list; vg; vg = vg->next) |
2b002173 | 49 | { |
50 | struct grub_lvm_lv *lv; | |
7ceeee39 | 51 | if (vg->lvs) |
52 | for (lv = vg->lvs; lv; lv = lv->next) | |
53 | if (hook (lv->name)) | |
54 | return 1; | |
2b002173 | 55 | } |
56 | ||
57 | return 0; | |
58 | } | |
59 | ||
b92f0c18 | 60 | #ifdef GRUB_UTIL |
61 | static grub_disk_memberlist_t | |
62 | grub_lvm_memberlist (grub_disk_t disk) | |
63 | { | |
64 | struct grub_lvm_lv *lv = disk->data; | |
65 | grub_disk_memberlist_t list = NULL, tmp; | |
66 | struct grub_lvm_pv *pv; | |
67 | ||
7ceeee39 | 68 | if (lv->vg->pvs) |
69 | for (pv = lv->vg->pvs; pv; pv = pv->next) | |
70 | { | |
71 | tmp = grub_malloc (sizeof (*tmp)); | |
72 | tmp->disk = pv->disk; | |
73 | tmp->next = list; | |
74 | list = tmp; | |
75 | } | |
b92f0c18 | 76 | |
77 | return list; | |
78 | } | |
79 | #endif | |
80 | ||
2b002173 | 81 | static grub_err_t |
82 | grub_lvm_open (const char *name, grub_disk_t disk) | |
83 | { | |
84 | struct grub_lvm_vg *vg; | |
85 | struct grub_lvm_lv *lv = NULL; | |
4d42b77f | 86 | for (vg = vg_list; vg; vg = vg->next) |
2b002173 | 87 | { |
7ceeee39 | 88 | if (vg->lvs) |
89 | for (lv = vg->lvs; lv; lv = lv->next) | |
90 | if (! grub_strcmp (lv->name, name)) | |
91 | break; | |
2b002173 | 92 | |
93 | if (lv) | |
94 | break; | |
95 | } | |
96 | ||
97 | if (! lv) | |
98 | return grub_error (GRUB_ERR_UNKNOWN_DEVICE, "Unknown device"); | |
99 | ||
100 | disk->has_partitions = 0; | |
101 | disk->id = lv->number; | |
102 | disk->data = lv; | |
103 | disk->total_sectors = lv->size; | |
104 | ||
105 | return 0; | |
106 | } | |
107 | ||
108 | static void | |
109 | grub_lvm_close (grub_disk_t disk __attribute ((unused))) | |
110 | { | |
111 | return; | |
112 | } | |
113 | ||
114 | static grub_err_t | |
115 | grub_lvm_read (grub_disk_t disk, grub_disk_addr_t sector, | |
116 | grub_size_t size, char *buf) | |
117 | { | |
118 | grub_err_t err = 0; | |
119 | struct grub_lvm_lv *lv = disk->data; | |
120 | struct grub_lvm_vg *vg = lv->vg; | |
121 | struct grub_lvm_segment *seg = lv->segments; | |
122 | struct grub_lvm_pv *pv; | |
123 | grub_uint64_t offset; | |
124 | grub_uint64_t extent; | |
125 | unsigned int i; | |
126 | ||
127 | extent = grub_divmod64 (sector, vg->extent_size, NULL); | |
128 | ||
129 | /* Find the right segment. */ | |
130 | for (i = 0; i < lv->segment_count; i++) | |
131 | { | |
132 | if ((seg->start_extent <= extent) | |
133 | && ((seg->start_extent + seg->extent_count) > extent)) | |
134 | { | |
135 | break; | |
136 | } | |
137 | ||
138 | seg++; | |
139 | } | |
140 | ||
141 | if (seg->stripe_count == 1) | |
142 | { | |
143 | /* This segment is linear, so that's easy. We just need to find | |
144 | out the offset in the physical volume and read SIZE bytes | |
145 | from that. */ | |
146 | struct grub_lvm_stripe *stripe = seg->stripes; | |
147 | grub_uint64_t seg_offset; /* Offset of the segment in PV device. */ | |
148 | ||
149 | pv = stripe->pv; | |
150 | seg_offset = ((grub_uint64_t) stripe->start | |
151 | * (grub_uint64_t) vg->extent_size) + pv->start; | |
152 | ||
153 | offset = sector - ((grub_uint64_t) seg->start_extent | |
154 | * (grub_uint64_t) vg->extent_size) + seg_offset; | |
155 | } | |
156 | else | |
157 | { | |
158 | /* This is a striped segment. We have to find the right PV | |
159 | similar to RAID0. */ | |
160 | struct grub_lvm_stripe *stripe = seg->stripes; | |
161 | grub_uint32_t a, b; | |
162 | grub_uint64_t seg_offset; /* Offset of the segment in PV device. */ | |
163 | unsigned int stripenr; | |
164 | ||
165 | offset = sector - ((grub_uint64_t) seg->start_extent | |
166 | * (grub_uint64_t) vg->extent_size); | |
167 | ||
168 | a = grub_divmod64 (offset, seg->stripe_size, NULL); | |
169 | grub_divmod64 (a, seg->stripe_count, &stripenr); | |
170 | ||
171 | a = grub_divmod64 (offset, seg->stripe_size * seg->stripe_count, NULL); | |
172 | grub_divmod64 (offset, seg->stripe_size, &b); | |
173 | offset = a * seg->stripe_size + b; | |
174 | ||
175 | stripe += stripenr; | |
176 | pv = stripe->pv; | |
177 | ||
178 | seg_offset = ((grub_uint64_t) stripe->start | |
179 | * (grub_uint64_t) vg->extent_size) + pv->start; | |
180 | ||
181 | offset += seg_offset; | |
182 | } | |
183 | ||
184 | /* Check whether we actually know the physical volume we want to | |
185 | read from. */ | |
186 | if (pv->disk) | |
187 | err = grub_disk_read (pv->disk, offset, 0, | |
188 | size << GRUB_DISK_SECTOR_BITS, buf); | |
189 | else | |
190 | err = grub_error (GRUB_ERR_UNKNOWN_DEVICE, | |
191 | "Physical volume %s not found", pv->name); | |
192 | ||
193 | return err; | |
194 | } | |
195 | ||
196 | static grub_err_t | |
197 | grub_lvm_write (grub_disk_t disk __attribute ((unused)), | |
198 | grub_disk_addr_t sector __attribute ((unused)), | |
199 | grub_size_t size __attribute ((unused)), | |
200 | const char *buf __attribute ((unused))) | |
201 | { | |
202 | return GRUB_ERR_NOT_IMPLEMENTED_YET; | |
203 | } | |
204 | ||
205 | static int | |
206 | grub_lvm_scan_device (const char *name) | |
207 | { | |
208 | grub_err_t err; | |
209 | grub_disk_t disk; | |
210 | grub_uint64_t da_offset, da_size, mda_offset, mda_size; | |
211 | char buf[GRUB_LVM_LABEL_SIZE]; | |
212 | char vg_id[GRUB_LVM_ID_STRLEN+1]; | |
213 | char pv_id[GRUB_LVM_ID_STRLEN+1]; | |
214 | char *metadatabuf, *p, *q, *vgname; | |
215 | struct grub_lvm_label_header *lh = (struct grub_lvm_label_header *) buf; | |
216 | struct grub_lvm_pv_header *pvh; | |
217 | struct grub_lvm_disk_locn *dlocn; | |
218 | struct grub_lvm_mda_header *mdah; | |
219 | struct grub_lvm_raw_locn *rlocn; | |
220 | unsigned int i, j, vgname_len; | |
221 | struct grub_lvm_vg *vg; | |
222 | struct grub_lvm_pv *pv; | |
223 | ||
224 | disk = grub_disk_open (name); | |
225 | if (!disk) | |
226 | return 0; | |
227 | ||
228 | /* Search for label. */ | |
229 | for (i = 0; i < GRUB_LVM_LABEL_SCAN_SECTORS; i++) | |
230 | { | |
231 | err = grub_disk_read (disk, i, 0, sizeof(buf), buf); | |
232 | if (err) | |
233 | goto fail; | |
234 | ||
235 | if ((! grub_strncmp ((char *)lh->id, GRUB_LVM_LABEL_ID, | |
236 | sizeof (lh->id))) | |
237 | && (! grub_strncmp ((char *)lh->type, GRUB_LVM_LVM2_LABEL, | |
238 | sizeof (lh->type)))) | |
239 | break; | |
240 | } | |
241 | ||
242 | /* Return if we didn't find a label. */ | |
243 | if (i == GRUB_LVM_LABEL_SCAN_SECTORS) | |
244 | goto fail; | |
245 | ||
246 | pvh = (struct grub_lvm_pv_header *) (buf + grub_le_to_cpu32(lh->offset_xl)); | |
247 | ||
248 | for (i = 0, j = 0; i < GRUB_LVM_ID_LEN; i++) | |
249 | { | |
250 | pv_id[j++] = pvh->pv_uuid[i]; | |
251 | if ((i != 1) && (i != 29) && (i % 4 == 1)) | |
252 | pv_id[j++] = '-'; | |
253 | } | |
254 | pv_id[j] = '\0'; | |
255 | ||
256 | dlocn = pvh->disk_areas_xl; | |
257 | da_offset = grub_le_to_cpu64 (dlocn->offset); | |
258 | da_size = grub_le_to_cpu64 (dlocn->size); | |
259 | ||
260 | dlocn++; | |
261 | /* Is it possible to have multiple data/metadata areas? I haven't | |
262 | seen devices that have it. */ | |
263 | if (dlocn->offset) | |
264 | { | |
265 | grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET, | |
266 | "We don't support multiple data areas"); | |
267 | ||
268 | goto fail; | |
269 | } | |
270 | ||
271 | dlocn++; | |
272 | mda_offset = grub_le_to_cpu64 (dlocn->offset); | |
273 | mda_size = grub_le_to_cpu64 (dlocn->size); | |
274 | dlocn++; | |
275 | ||
276 | if (dlocn->offset) | |
277 | { | |
278 | grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET, | |
279 | "We don't support multiple metadata areas"); | |
280 | ||
281 | goto fail; | |
282 | } | |
283 | ||
284 | metadatabuf = grub_malloc (mda_size); | |
285 | if (! metadatabuf) | |
286 | goto fail; | |
287 | ||
288 | err = grub_disk_read (disk, 0, mda_offset, mda_size, metadatabuf); | |
289 | if (err) | |
290 | goto fail2; | |
291 | ||
292 | mdah = (struct grub_lvm_mda_header *) metadatabuf; | |
293 | if ((grub_strncmp ((char *)mdah->magic, GRUB_LVM_FMTT_MAGIC, | |
294 | sizeof (mdah->magic))) | |
295 | || (grub_le_to_cpu32 (mdah->version) != GRUB_LVM_FMTT_VERSION)) | |
296 | { | |
297 | grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET, | |
298 | "Unknown metadata header"); | |
299 | goto fail2; | |
300 | } | |
301 | ||
302 | rlocn = mdah->raw_locns; | |
303 | p = q = metadatabuf + grub_le_to_cpu64 (rlocn->offset); | |
304 | ||
305 | while (*q != ' ') | |
306 | q++; | |
307 | ||
308 | vgname_len = q - p; | |
309 | vgname = grub_malloc (vgname_len + 1); | |
310 | if (!vgname) | |
311 | goto fail2; | |
312 | ||
313 | grub_memcpy (vgname, p, vgname_len); | |
314 | vgname[vgname_len] = '\0'; | |
315 | ||
316 | p = grub_strstr (q, "id = \"") + sizeof ("id = \"") - 1; | |
317 | grub_memcpy (vg_id, p, GRUB_LVM_ID_STRLEN); | |
318 | vg_id[GRUB_LVM_ID_STRLEN] = '\0'; | |
319 | ||
4d42b77f | 320 | for (vg = vg_list; vg; vg = vg->next) |
2b002173 | 321 | { |
322 | if (! grub_memcmp(vg_id, vg->id, GRUB_LVM_ID_STRLEN)) | |
323 | break; | |
324 | } | |
325 | ||
326 | if (! vg) | |
327 | { | |
328 | /* First time we see this volume group. We've to create the | |
329 | whole volume group structure. */ | |
330 | vg = grub_malloc (sizeof (*vg)); | |
331 | if (! vg) | |
332 | { | |
333 | grub_free (vgname); | |
334 | goto fail; | |
335 | } | |
336 | vg->name = vgname; | |
337 | grub_memcpy (vg->id, vg_id, GRUB_LVM_ID_STRLEN+1); | |
338 | ||
339 | vg->extent_size = grub_lvm_getvalue (&p, "extent_size = "); | |
7ceeee39 | 340 | if (p == NULL) |
341 | goto fail2; | |
2b002173 | 342 | |
343 | vg->lvs = NULL; | |
344 | vg->pvs = NULL; | |
4d42b77f | 345 | vg->next = vg_list; |
346 | vg_list = vg; | |
2b002173 | 347 | |
7ceeee39 | 348 | p = grub_strstr (p, "physical_volumes {"); |
349 | if (p) | |
2b002173 | 350 | { |
7ceeee39 | 351 | p += sizeof ("physical_volumes {") - 1; |
2b002173 | 352 | |
7ceeee39 | 353 | /* Add all the pvs to the volume group. */ |
354 | while (1) | |
355 | { | |
356 | int s; | |
357 | while (grub_isspace (*p)) | |
358 | p++; | |
359 | ||
360 | if (*p == '}') | |
361 | break; | |
362 | ||
363 | pv = grub_malloc (sizeof (*pv)); | |
364 | q = p; | |
365 | while (*q != ' ') | |
366 | q++; | |
367 | ||
368 | s = q - p; | |
369 | pv->name = grub_malloc (s + 1); | |
370 | grub_memcpy (pv->name, p, s); | |
371 | pv->name[s] = '\0'; | |
372 | ||
373 | p = grub_strstr (p, "id = \"") + sizeof("id = \"") - 1; | |
374 | if (p == NULL) | |
375 | goto pvs_fail; | |
376 | ||
377 | grub_memcpy (pv->id, p, GRUB_LVM_ID_STRLEN); | |
378 | pv->id[GRUB_LVM_ID_STRLEN] = '\0'; | |
379 | ||
380 | pv->start = grub_lvm_getvalue (&p, "pe_start = "); | |
381 | if (p == NULL) | |
382 | goto pvs_fail; | |
383 | pv->disk = NULL; | |
384 | pv->next = vg->pvs; | |
385 | vg->pvs = pv; | |
386 | ||
387 | p = grub_strchr (p, '}') + 1; | |
388 | ||
389 | continue; | |
390 | pvs_fail: | |
391 | grub_free (pv->name); | |
392 | grub_free (pv); | |
393 | goto fail2; | |
394 | } | |
2b002173 | 395 | } |
396 | ||
397 | p = grub_strstr (p, "logical_volumes"); | |
7ceeee39 | 398 | if (p) |
2b002173 | 399 | { |
7ceeee39 | 400 | p += 18; |
2b002173 | 401 | |
7ceeee39 | 402 | /* And add all the lvs to the volume group. */ |
403 | while (1) | |
2b002173 | 404 | { |
7ceeee39 | 405 | int s; |
406 | struct grub_lvm_lv *lv; | |
407 | struct grub_lvm_segment *seg; | |
2b002173 | 408 | |
7ceeee39 | 409 | while (grub_isspace (*p)) |
410 | p++; | |
411 | ||
412 | if (*p == '}') | |
413 | break; | |
414 | ||
415 | lv = grub_malloc (sizeof (*lv)); | |
2b002173 | 416 | |
7ceeee39 | 417 | q = p; |
418 | while (*q != ' ') | |
419 | q++; | |
2b002173 | 420 | |
7ceeee39 | 421 | s = q - p; |
422 | lv->name = grub_malloc (vgname_len + 1 + s + 1); | |
423 | grub_memcpy (lv->name, vgname, vgname_len); | |
424 | lv->name[vgname_len] = '-'; | |
425 | grub_memcpy (lv->name + vgname_len + 1, p, s); | |
426 | lv->name[vgname_len + 1 + s] = '\0'; | |
427 | ||
428 | lv->size = 0; | |
429 | ||
430 | lv->segment_count = grub_lvm_getvalue (&p, "segment_count = "); | |
431 | if (p == NULL) | |
432 | goto lvs_fail; | |
433 | lv->segments = grub_malloc (sizeof (*seg) * lv->segment_count); | |
434 | seg = lv->segments; | |
435 | ||
436 | for (i = 0; i < lv->segment_count; i++) | |
2b002173 | 437 | { |
7ceeee39 | 438 | struct grub_lvm_stripe *stripe; |
2b002173 | 439 | |
7ceeee39 | 440 | p = grub_strstr (p, "segment"); |
441 | if (p == NULL) | |
442 | goto lvs_segment_fail; | |
443 | ||
444 | seg->start_extent = grub_lvm_getvalue (&p, "start_extent = "); | |
445 | if (p == NULL) | |
446 | goto lvs_segment_fail; | |
447 | seg->extent_count = grub_lvm_getvalue (&p, "extent_count = "); | |
448 | if (p == NULL) | |
449 | goto lvs_segment_fail; | |
450 | seg->stripe_count = grub_lvm_getvalue (&p, "stripe_count = "); | |
451 | if (p == NULL) | |
452 | goto lvs_segment_fail; | |
453 | ||
454 | lv->size += seg->extent_count * vg->extent_size; | |
455 | ||
456 | if (seg->stripe_count != 1) | |
457 | seg->stripe_size = grub_lvm_getvalue (&p, "stripe_size = "); | |
2b002173 | 458 | |
7ceeee39 | 459 | seg->stripes = grub_malloc (sizeof (*stripe) |
460 | * seg->stripe_count); | |
461 | stripe = seg->stripes; | |
462 | ||
463 | p = grub_strstr (p, "stripes = ["); | |
464 | if (p == NULL) | |
465 | goto lvs_segment_fail2; | |
466 | p += sizeof("stripes = [") - 1; | |
467 | ||
468 | for (j = 0; j < seg->stripe_count; j++) | |
2b002173 | 469 | { |
0a1150e2 | 470 | char *pvname; |
7ceeee39 | 471 | |
472 | p = grub_strchr (p, '"'); | |
473 | if (p == NULL) | |
474 | continue; | |
475 | q = ++p; | |
476 | while (*q != '"') | |
477 | q++; | |
478 | ||
479 | s = q - p; | |
0a1150e2 | 480 | pvname = grub_malloc (s + 1); |
7ceeee39 | 481 | grub_memcpy (pvname, p, s); |
482 | pvname[s] = '\0'; | |
483 | ||
484 | if (vg->pvs) | |
485 | for (pv = vg->pvs; pv; pv = pv->next) | |
486 | { | |
487 | if (! grub_strcmp (pvname, pv->name)) | |
488 | { | |
489 | stripe->pv = pv; | |
490 | break; | |
491 | } | |
492 | } | |
493 | ||
0a1150e2 | 494 | grub_free(pvname); |
495 | ||
7ceeee39 | 496 | stripe->start = grub_lvm_getvalue (&p, ","); |
497 | if (p == NULL) | |
498 | continue; | |
499 | ||
500 | stripe++; | |
2b002173 | 501 | } |
2b002173 | 502 | |
7ceeee39 | 503 | seg++; |
504 | ||
505 | continue; | |
506 | lvs_segment_fail2: | |
507 | grub_free (seg->stripes); | |
508 | lvs_segment_fail: | |
509 | goto fail2; | |
2b002173 | 510 | } |
511 | ||
7ceeee39 | 512 | lv->number = lv_count++; |
513 | lv->vg = vg; | |
514 | lv->next = vg->lvs; | |
515 | vg->lvs = lv; | |
516 | ||
517 | p = grub_strchr (p, '}'); | |
518 | if (p == NULL) | |
519 | goto lvs_fail; | |
520 | p += 3; | |
521 | ||
522 | continue; | |
523 | lvs_fail: | |
524 | grub_free (lv->name); | |
525 | grub_free (lv); | |
526 | goto fail2; | |
2b002173 | 527 | } |
2b002173 | 528 | } |
529 | } | |
530 | else | |
531 | { | |
532 | grub_free (vgname); | |
533 | } | |
534 | ||
535 | /* Match the device we are currently reading from with the right | |
536 | PV. */ | |
7ceeee39 | 537 | if (vg->pvs) |
538 | for (pv = vg->pvs; pv; pv = pv->next) | |
539 | { | |
540 | if (! grub_memcmp (pv->id, pv_id, GRUB_LVM_ID_STRLEN)) | |
541 | { | |
542 | pv->disk = grub_disk_open (name); | |
543 | break; | |
544 | } | |
545 | } | |
2b002173 | 546 | |
547 | fail2: | |
548 | grub_free (metadatabuf); | |
549 | fail: | |
550 | grub_disk_close (disk); | |
551 | return 0; | |
552 | } | |
553 | ||
554 | static struct grub_disk_dev grub_lvm_dev = | |
555 | { | |
556 | .name = "lvm", | |
557 | .id = GRUB_DISK_DEVICE_LVM_ID, | |
558 | .iterate = grub_lvm_iterate, | |
559 | .open = grub_lvm_open, | |
560 | .close = grub_lvm_close, | |
561 | .read = grub_lvm_read, | |
562 | .write = grub_lvm_write, | |
b92f0c18 | 563 | #ifdef GRUB_UTIL |
564 | .memberlist = grub_lvm_memberlist, | |
565 | #endif | |
2b002173 | 566 | .next = 0 |
567 | }; | |
568 | ||
569 | \f | |
570 | GRUB_MOD_INIT(lvm) | |
571 | { | |
572 | grub_device_iterate (&grub_lvm_scan_device); | |
573 | grub_disk_dev_register (&grub_lvm_dev); | |
574 | } | |
575 | ||
576 | GRUB_MOD_FINI(lvm) | |
577 | { | |
578 | grub_disk_dev_unregister (&grub_lvm_dev); | |
579 | /* FIXME: free the lvm list. */ | |
580 | } |