]> git.ipfire.org Git - thirdparty/mdadm.git/blob - super0.c
projects / thirdparty / mdadm.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Set LOG_PID for syslog
[thirdparty/mdadm.git] / super0.c
1 /*
2 * mdadm - manage Linux "md" devices aka RAID arrays.
3 *
4 * Copyright (C) 2001-2006 Neil Brown <neilb@suse.de>
5 *
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 *
21 * Author: Neil Brown
22 * Email: <neilb@cse.unsw.edu.au>
23 * Paper: Neil Brown
24 * School of Computer Science and Engineering
25 * The University of New South Wales
26 * Sydney, 2052
27 * Australia
28 */
29
30 #define HAVE_STDINT_H 1
31 #include "mdadm.h"
32 #include "sha1.h"
33 /*
34 * All handling for the 0.90.0 version superblock is in
35 * this file.
36 * This includes:
37 * - finding, loading, and writing the superblock.
38 * - initialising a new superblock
39 * - printing the superblock for --examine
40 * - printing part of the superblock for --detail
41 * .. other stuff
42 */
43
44
45 static unsigned long calc_sb0_csum(mdp_super_t *super)
46 {
47 unsigned long csum = super->sb_csum;
48 unsigned long newcsum;
49 super->sb_csum= 0 ;
50 newcsum = calc_csum(super, MD_SB_BYTES);
51 super->sb_csum = csum;
52 return newcsum;
53 }
54
55
56 void super0_swap_endian(struct mdp_superblock_s *sb)
57 {
58 /* as super0 superblocks are host-endian, it is sometimes
59 * useful to be able to swap the endianness
60 * as (almost) everything is u32's we byte-swap every 4byte
61 * number.
62 * We then also have to swap the events_hi and events_lo
63 */
64 char *sbc = (char *)sb;
65 __u32 t32;
66 int i;
67
68 for (i=0; i < MD_SB_BYTES ; i+=4) {
69 char t = sbc[i];
70 sbc[i] = sbc[i+3];
71 sbc[i+3] = t;
72 t=sbc[i+1];
73 sbc[i+1]=sbc[i+2];
74 sbc[i+2]=t;
75 }
76 t32 = sb->events_hi;
77 sb->events_hi = sb->events_lo;
78 sb->events_lo = t32;
79
80 t32 = sb->cp_events_hi;
81 sb->cp_events_hi = sb->cp_events_lo;
82 sb->cp_events_lo = t32;
83
84 }
85
86 #ifndef MDASSEMBLE
87
88 static void examine_super0(struct supertype *st, char *homehost)
89 {
90 mdp_super_t *sb = st->sb;
91 time_t atime;
92 int d;
93 char *c;
94
95 printf(" Magic : %08x\n", sb->md_magic);
96 printf(" Version : %02d.%02d.%02d\n", sb->major_version, sb->minor_version,
97 sb->patch_version);
98 if (sb->minor_version >= 90) {
99 printf(" UUID : %08x:%08x:%08x:%08x", sb->set_uuid0, sb->set_uuid1,
100 sb->set_uuid2, sb->set_uuid3);
101 if (homehost) {
102 char buf[20];
103 void *hash = sha1_buffer(homehost,
104 strlen(homehost),
105 buf);
106 if (memcmp(&sb->set_uuid2, hash, 8)==0)
107 printf(" (local to host %s)", homehost);
108 }
109 printf("\n");
110 } else
111 printf(" UUID : %08x\n", sb->set_uuid0);
112
113 if (sb->not_persistent)
114 printf(" Eedk : not persistent\n");
115
116 atime = sb->ctime;
117 printf(" Creation Time : %.24s\n", ctime(&atime));
118 c=map_num(pers, sb->level);
119 printf(" Raid Level : %s\n", c?c:"-unknown-");
120 if ((int)sb->level >= 0) {
121 int ddsks=0;
122 printf(" Used Dev Size : %d%s\n", sb->size,
123 human_size((long long)sb->size<<10));
124 switch(sb->level) {
125 case 1: ddsks=1;break;
126 case 4:
127 case 5: ddsks = sb->raid_disks-1; break;
128 case 6: ddsks = sb->raid_disks-2; break;
129 case 10: ddsks = sb->raid_disks / (sb->layout&255) / ((sb->layout>>8)&255);
130 }
131 if (ddsks)
132 printf(" Array Size : %llu%s\n", (unsigned long long)ddsks * sb->size,
133 human_size(ddsks*(long long)sb->size<<10));
134 }
135 printf(" Raid Devices : %d\n", sb->raid_disks);
136 printf(" Total Devices : %d\n", sb->nr_disks);
137 printf("Preferred Minor : %d\n", sb->md_minor);
138 printf("\n");
139 if (sb->minor_version > 90 && (sb->reshape_position+1) != 0) {
140 printf(" Reshape pos'n : %llu%s\n", (unsigned long long)sb->reshape_position/2, human_size((long long)sb->reshape_position<<9));
141 if (sb->delta_disks) {
142 printf(" Delta Devices : %d", sb->delta_disks);
143 if (sb->delta_disks)
144 printf(" (%d->%d)\n", sb->raid_disks-sb->delta_disks, sb->raid_disks);
145 else
146 printf(" (%d->%d)\n", sb->raid_disks, sb->raid_disks+sb->delta_disks);
147 }
148 if (sb->new_level != sb->level) {
149 c = map_num(pers, sb->new_level);
150 printf(" New Level : %s\n", c?c:"-unknown-");
151 }
152 if (sb->new_layout != sb->layout) {
153 if (sb->level == 5) {
154 c = map_num(r5layout, sb->new_layout);
155 printf(" New Layout : %s\n", c?c:"-unknown-");
156 }
157 if (sb->level == 10) {
158 printf(" New Layout : near=%d, %s=%d\n",
159 sb->new_layout&255,
160 (sb->new_layout&0x10000)?"offset":"far",
161 (sb->new_layout>>8)&255);
162 }
163 }
164 if (sb->new_chunk != sb->chunk_size)
165 printf(" New Chunksize : %d\n", sb->new_chunk);
166 printf("\n");
167 }
168 atime = sb->utime;
169 printf(" Update Time : %.24s\n", ctime(&atime));
170 printf(" State : %s\n",
171 (sb->state&(1<<MD_SB_CLEAN))?"clean":"active");
172 if (sb->state & (1<<MD_SB_BITMAP_PRESENT))
173 printf("Internal Bitmap : present\n");
174 printf(" Active Devices : %d\n", sb->active_disks);
175 printf("Working Devices : %d\n", sb->working_disks);
176 printf(" Failed Devices : %d\n", sb->failed_disks);
177 printf(" Spare Devices : %d\n", sb->spare_disks);
178 if (calc_sb0_csum(sb) == sb->sb_csum)
179 printf(" Checksum : %x - correct\n", sb->sb_csum);
180 else
181 printf(" Checksum : %x - expected %lx\n", sb->sb_csum, calc_sb0_csum(sb));
182 printf(" Events : %llu\n",
183 ((unsigned long long)sb->events_hi << 32)
184 + sb->events_lo);
185 printf("\n");
186 if (sb->level == 5) {
187 c = map_num(r5layout, sb->layout);
188 printf(" Layout : %s\n", c?c:"-unknown-");
189 }
190 if (sb->level == 10) {
191 printf(" Layout : near=%d, %s=%d\n",
192 sb->layout&255,
193 (sb->layout&0x10000)?"offset":"far",
194 (sb->layout>>8)&255);
195 }
196 switch(sb->level) {
197 case 0:
198 case 4:
199 case 5:
200 case 6:
201 case 10:
202 printf(" Chunk Size : %dK\n", sb->chunk_size/1024);
203 break;
204 case -1:
205 printf(" Rounding : %dK\n", sb->chunk_size/1024);
206 break;
207 default: break;
208 }
209 printf("\n");
210 printf(" Number Major Minor RaidDevice State\n");
211 for (d= -1; d<(signed int)(sb->raid_disks+sb->spare_disks); d++) {
212 mdp_disk_t *dp;
213 char *dv;
214 char nb[5];
215 int wonly;
216 if (d>=0) dp = &sb->disks[d];
217 else dp = &sb->this_disk;
218 snprintf(nb, sizeof(nb), "%4d", d);
219 printf("%4s %5d %5d %5d %5d ", d < 0 ? "this" : nb,
220 dp->number, dp->major, dp->minor, dp->raid_disk);
221 wonly = dp->state & (1<<MD_DISK_WRITEMOSTLY);
222 dp->state &= ~(1<<MD_DISK_WRITEMOSTLY);
223 if (dp->state & (1<<MD_DISK_FAULTY)) printf(" faulty");
224 if (dp->state & (1<<MD_DISK_ACTIVE)) printf(" active");
225 if (dp->state & (1<<MD_DISK_SYNC)) printf(" sync");
226 if (dp->state & (1<<MD_DISK_REMOVED)) printf(" removed");
227 if (wonly) printf(" write-mostly");
228 if (dp->state == 0) printf(" spare");
229 if ((dv=map_dev(dp->major, dp->minor, 0)))
230 printf(" %s", dv);
231 printf("\n");
232 if (d == -1) printf("\n");
233 }
234 }
235
236 static void brief_examine_super0(struct supertype *st)
237 {
238 mdp_super_t *sb = st->sb;
239 char *c=map_num(pers, sb->level);
240 char devname[20];
241
242 sprintf(devname, "/dev/md%d", sb->md_minor);
243
244 printf("ARRAY %s level=%s num-devices=%d UUID=",
245 devname,
246 c?c:"-unknown-", sb->raid_disks);
247 if (sb->minor_version >= 90)
248 printf("%08x:%08x:%08x:%08x", sb->set_uuid0, sb->set_uuid1,
249 sb->set_uuid2, sb->set_uuid3);
250 else
251 printf("%08x", sb->set_uuid0);
252 printf("\n");
253 }
254
255 static void export_examine_super0(struct supertype *st)
256 {
257 mdp_super_t *sb = st->sb;
258
259 printf("MD_LEVEL=%s\n", map_num(pers, sb->level));
260 printf("MD_DEVICES=%d\n", sb->raid_disks);
261 if (sb->minor_version >= 90)
262 printf("MD_UUID=%08x:%08x:%08x:%08x\n",
263 sb->set_uuid0, sb->set_uuid1,
264 sb->set_uuid2, sb->set_uuid3);
265 else
266 printf("MD_UUID=%08x\n", sb->set_uuid0);
267 printf("MD_UPDATE_TIME=%llu\n",
268 __le64_to_cpu(sb->ctime) & 0xFFFFFFFFFFULL);
269 printf("MD_EVENTS=%llu\n",
270 ((unsigned long long)sb->events_hi << 32)
271 + sb->events_lo);
272 }
273
274 static void detail_super0(struct supertype *st, char *homehost)
275 {
276 mdp_super_t *sb = st->sb;
277 printf(" UUID : ");
278 if (sb->minor_version >= 90)
279 printf("%08x:%08x:%08x:%08x", sb->set_uuid0, sb->set_uuid1,
280 sb->set_uuid2, sb->set_uuid3);
281 else
282 printf("%08x", sb->set_uuid0);
283 if (homehost) {
284 char buf[20];
285 void *hash = sha1_buffer(homehost,
286 strlen(homehost),
287 buf);
288 if (memcmp(&sb->set_uuid2, hash, 8)==0)
289 printf(" (local to host %s)", homehost);
290 }
291 printf("\n Events : %d.%d\n\n", sb->events_hi, sb->events_lo);
292 }
293
294 static void brief_detail_super0(struct supertype *st)
295 {
296 mdp_super_t *sb = st->sb;
297 printf(" UUID=");
298 if (sb->minor_version >= 90)
299 printf("%08x:%08x:%08x:%08x", sb->set_uuid0, sb->set_uuid1,
300 sb->set_uuid2, sb->set_uuid3);
301 else
302 printf("%08x", sb->set_uuid0);
303 }
304
305 static void export_detail_super0(struct supertype *st)
306 {
307 mdp_super_t *sb = st->sb;
308 printf("MD_UUID=");
309 if (sb->minor_version >= 90)
310 printf("%08x:%08x:%08x:%08x", sb->set_uuid0, sb->set_uuid1,
311 sb->set_uuid2, sb->set_uuid3);
312 else
313 printf("%08x", sb->set_uuid0);
314 printf("\n");
315 }
316 #endif
317
318 static int match_home0(struct supertype *st, char *homehost)
319 {
320 mdp_super_t *sb = st->sb;
321 char buf[20];
322 char *hash = sha1_buffer(homehost,
323 strlen(homehost),
324 buf);
325
326 return (memcmp(&sb->set_uuid2, hash, 8)==0);
327 }
328
329 static void uuid_from_super0(struct supertype *st, int uuid[4])
330 {
331 mdp_super_t *super = st->sb;
332 uuid[0] = super->set_uuid0;
333 if (super->minor_version >= 90) {
334 uuid[1] = super->set_uuid1;
335 uuid[2] = super->set_uuid2;
336 uuid[3] = super->set_uuid3;
337 } else {
338 uuid[1] = 0;
339 uuid[2] = 0;
340 uuid[3] = 0;
341 }
342 }
343
344 static void getinfo_super0(struct supertype *st, struct mdinfo *info)
345 {
346 mdp_super_t *sb = st->sb;
347 int working = 0;
348 int i;
349
350 info->array.major_version = sb->major_version;
351 info->array.minor_version = sb->minor_version;
352 info->array.patch_version = sb->patch_version;
353 info->array.raid_disks = sb->raid_disks;
354 info->array.level = sb->level;
355 info->array.layout = sb->layout;
356 info->array.md_minor = sb->md_minor;
357 info->array.ctime = sb->ctime;
358 info->array.utime = sb->utime;
359 info->array.chunk_size = sb->chunk_size;
360 info->array.state = sb->state;
361 info->component_size = sb->size*2;
362
363 info->disk.state = sb->this_disk.state;
364 info->disk.major = sb->this_disk.major;
365 info->disk.minor = sb->this_disk.minor;
366 info->disk.raid_disk = sb->this_disk.raid_disk;
367 info->disk.number = sb->this_disk.number;
368
369 info->events = md_event(sb);
370 info->data_offset = 0;
371
372 uuid_from_super0(st, info->uuid);
373
374 if (sb->minor_version > 90 && (sb->reshape_position+1) != 0) {
375 info->reshape_active = 1;
376 info->reshape_progress = sb->reshape_position;
377 info->new_level = sb->new_level;
378 info->delta_disks = sb->delta_disks;
379 info->new_layout = sb->new_layout;
380 info->new_chunk = sb->new_chunk;
381 } else
382 info->reshape_active = 0;
383
384 sprintf(info->name, "%d", sb->md_minor);
385 /* work_disks is calculated rather than read directly */
386 for (i=0; i < MD_SB_DISKS; i++)
387 if ((sb->disks[i].state & (1<<MD_DISK_SYNC)) &&
388 (sb->disks[i].raid_disk < info->array.raid_disks) &&
389 (sb->disks[i].state & (1<<MD_DISK_ACTIVE)) &&
390 !(sb->disks[i].state & (1<<MD_DISK_FAULTY)))
391 working ++;
392 info->array.working_disks = working;
393 }
394
395
396 static int update_super0(struct supertype *st, struct mdinfo *info,
397 char *update,
398 char *devname, int verbose,
399 int uuid_set, char *homehost)
400 {
401 /* NOTE: for 'assemble' and 'force' we need to return non-zero if any change was made.
402 * For others, the return value is ignored.
403 */
404 int rv = 0;
405 mdp_super_t *sb = st->sb;
406 if (strcmp(update, "sparc2.2")==0 ) {
407 /* 2.2 sparc put the events in the wrong place
408 * So we copy the tail of the superblock
409 * up 4 bytes before continuing
410 */
411 __u32 *sb32 = (__u32*)sb;
412 memcpy(sb32+MD_SB_GENERIC_CONSTANT_WORDS+7,
413 sb32+MD_SB_GENERIC_CONSTANT_WORDS+7+1,
414 (MD_SB_WORDS - (MD_SB_GENERIC_CONSTANT_WORDS+7+1))*4);
415 if (verbose >= 0)
416 fprintf (stderr, Name ": adjusting superblock of %s for 2.2/sparc compatability.\n",
417 devname);
418 }
419 if (strcmp(update, "super-minor") ==0) {
420 sb->md_minor = info->array.md_minor;
421 if (verbose > 0)
422 fprintf(stderr, Name ": updating superblock of %s with minor number %d\n",
423 devname, info->array.md_minor);
424 }
425 if (strcmp(update, "summaries") == 0) {
426 int i;
427 /* set nr_disks, active_disks, working_disks,
428 * failed_disks, spare_disks based on disks[]
429 * array in superblock.
430 * Also make sure extra slots aren't 'failed'
431 */
432 sb->nr_disks = sb->active_disks =
433 sb->working_disks = sb->failed_disks =
434 sb->spare_disks = 0;
435 for (i=0; i < MD_SB_DISKS ; i++)
436 if (sb->disks[i].major ||
437 sb->disks[i].minor) {
438 int state = sb->disks[i].state;
439 if (state & (1<<MD_DISK_REMOVED))
440 continue;
441 sb->nr_disks++;
442 if (state & (1<<MD_DISK_ACTIVE))
443 sb->active_disks++;
444 if (state & (1<<MD_DISK_FAULTY))
445 sb->failed_disks++;
446 else
447 sb->working_disks++;
448 if (state == 0)
449 sb->spare_disks++;
450 } else if (i >= sb->raid_disks && sb->disks[i].number == 0)
451 sb->disks[i].state = 0;
452 }
453 if (strcmp(update, "force-one")==0) {
454 /* Not enough devices for a working array, so
455 * bring this one up-to-date.
456 */
457 __u32 ehi = sb->events_hi, elo = sb->events_lo;
458 sb->events_hi = (info->events>>32) & 0xFFFFFFFF;
459 sb->events_lo = (info->events) & 0xFFFFFFFF;
460 if (sb->events_hi != ehi ||
461 sb->events_lo != elo)
462 rv = 1;
463 }
464 if (strcmp(update, "force-array")==0) {
465 /* degraded array and 'force' requested, so
466 * maybe need to mark it 'clean'
467 */
468 if ((sb->level == 5 || sb->level == 4 || sb->level == 6) &&
469 (sb->state & (1 << MD_SB_CLEAN)) == 0) {
470 /* need to force clean */
471 sb->state |= (1 << MD_SB_CLEAN);
472 rv = 1;
473 }
474 }
475 if (strcmp(update, "assemble")==0) {
476 int d = info->disk.number;
477 int wonly = sb->disks[d].state & (1<<MD_DISK_WRITEMOSTLY);
478 if ((sb->disks[d].state & ~(1<<MD_DISK_WRITEMOSTLY))
479 != info->disk.state) {
480 sb->disks[d].state = info->disk.state | wonly;
481 rv = 1;
482 }
483 }
484 if (strcmp(update, "linear-grow-new") == 0) {
485 memset(&sb->disks[info->disk.number], 0, sizeof(sb->disks[0]));
486 sb->disks[info->disk.number].number = info->disk.number;
487 sb->disks[info->disk.number].major = info->disk.major;
488 sb->disks[info->disk.number].minor = info->disk.minor;
489 sb->disks[info->disk.number].raid_disk = info->disk.raid_disk;
490 sb->disks[info->disk.number].state = info->disk.state;
491 sb->this_disk = sb->disks[info->disk.number];
492 }
493 if (strcmp(update, "linear-grow-update") == 0) {
494 sb->raid_disks = info->array.raid_disks;
495 sb->nr_disks = info->array.nr_disks;
496 sb->active_disks = info->array.active_disks;
497 sb->working_disks = info->array.working_disks;
498 memset(&sb->disks[info->disk.number], 0, sizeof(sb->disks[0]));
499 sb->disks[info->disk.number].number = info->disk.number;
500 sb->disks[info->disk.number].major = info->disk.major;
501 sb->disks[info->disk.number].minor = info->disk.minor;
502 sb->disks[info->disk.number].raid_disk = info->disk.raid_disk;
503 sb->disks[info->disk.number].state = info->disk.state;
504 }
505 if (strcmp(update, "resync") == 0) {
506 /* make sure resync happens */
507 sb->state &= ~(1<<MD_SB_CLEAN);
508 sb->recovery_cp = 0;
509 }
510 if (strcmp(update, "homehost") == 0 &&
511 homehost) {
512 uuid_set = 0;
513 update = "uuid";
514 info->uuid[0] = sb->set_uuid0;
515 info->uuid[1] = sb->set_uuid1;
516 }
517 if (strcmp(update, "uuid") == 0) {
518 if (!uuid_set && homehost) {
519 char buf[20];
520 char *hash = sha1_buffer(homehost,
521 strlen(homehost),
522 buf);
523 memcpy(info->uuid+2, hash, 8);
524 }
525 sb->set_uuid0 = info->uuid[0];
526 sb->set_uuid1 = info->uuid[1];
527 sb->set_uuid2 = info->uuid[2];
528 sb->set_uuid3 = info->uuid[3];
529 if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) {
530 struct bitmap_super_s *bm;
531 bm = (struct bitmap_super_s*)(sb+1);
532 uuid_from_super0(st, (int*)bm->uuid);
533 }
534 }
535 if (strcmp(update, "_reshape_progress")==0)
536 sb->reshape_position = info->reshape_progress;
537
538 sb->sb_csum = calc_sb0_csum(sb);
539 return rv;
540 }
541
542 /*
543 * For verion-0 superblock, the homehost is 'stored' in the
544 * uuid. 8 bytes for a hash of the host leaving 8 bytes
545 * of random material.
546 * We use the first 8 bytes (64bits) of the sha1 of the
547 * host name
548 */
549
550
551 static int init_super0(struct supertype *st, mdu_array_info_t *info,
552 unsigned long long size, char *ignored_name, char *homehost,
553 int *uuid)
554 {
555 mdp_super_t *sb = malloc(MD_SB_BYTES + sizeof(bitmap_super_t));
556 int spares;
557 memset(sb, 0, MD_SB_BYTES + sizeof(bitmap_super_t));
558
559 st->sb = sb;
560 if (info->major_version == -1) {
561 /* zeroing the superblock */
562 return 0;
563 }
564
565 spares = info->working_disks - info->active_disks;
566 if (info->raid_disks + spares > MD_SB_DISKS) {
567 fprintf(stderr, Name ": too many devices requested: %d+%d > %d\n",
568 info->raid_disks , spares, MD_SB_DISKS);
569 return 0;
570 }
571
572 sb->md_magic = MD_SB_MAGIC;
573 sb->major_version = 0;
574 sb->minor_version = 90;
575 sb->patch_version = 0;
576 sb->gvalid_words = 0; /* ignored */
577 sb->ctime = time(0);
578 sb->level = info->level;
579 if (size != info->size)
580 return 0;
581 sb->size = info->size;
582 sb->nr_disks = info->nr_disks;
583 sb->raid_disks = info->raid_disks;
584 sb->md_minor = info->md_minor;
585 sb->not_persistent = 0;
586 if (uuid) {
587 sb->set_uuid0 = uuid[0];
588 sb->set_uuid1 = uuid[1];
589 sb->set_uuid2 = uuid[2];
590 sb->set_uuid3 = uuid[3];
591 } else {
592 int rfd = open("/dev/urandom", O_RDONLY);
593 if (rfd < 0 || read(rfd, &sb->set_uuid0, 4) != 4)
594 sb->set_uuid0 = random();
595 if (rfd < 0 || read(rfd, &sb->set_uuid1, 12) != 12) {
596 sb->set_uuid1 = random();
597 sb->set_uuid2 = random();
598 sb->set_uuid3 = random();
599 }
600 if (rfd >= 0)
601 close(rfd);
602 }
603 if (homehost) {
604 char buf[20];
605 char *hash = sha1_buffer(homehost,
606 strlen(homehost),
607 buf);
608 memcpy(&sb->set_uuid2, hash, 8);
609 }
610
611 sb->utime = sb->ctime;
612 sb->state = info->state;
613 sb->active_disks = info->active_disks;
614 sb->working_disks = info->working_disks;
615 sb->failed_disks = info->failed_disks;
616 sb->spare_disks = info->spare_disks;
617 sb->events_hi = 0;
618 sb->events_lo = 1;
619
620 sb->layout = info->layout;
621 sb->chunk_size = info->chunk_size;
622
623 return 1;
624 }
625
626 /* Add a device to the superblock being created */
627 static void add_to_super0(struct supertype *st, mdu_disk_info_t *dinfo)
628 {
629 mdp_super_t *sb = st->sb;
630 mdp_disk_t *dk = &sb->disks[dinfo->number];
631
632 dk->number = dinfo->number;
633 dk->major = dinfo->major;
634 dk->minor = dinfo->minor;
635 dk->raid_disk = dinfo->raid_disk;
636 dk->state = dinfo->state;
637 }
638
639 static int store_super0(struct supertype *st, int fd)
640 {
641 unsigned long long dsize;
642 unsigned long long offset;
643 mdp_super_t *super = st->sb;
644
645 if (!get_dev_size(fd, NULL, &dsize))
646 return 1;
647
648 if (dsize < MD_RESERVED_SECTORS*512)
649 return 2;
650
651 offset = MD_NEW_SIZE_SECTORS(dsize>>9);
652
653 offset *= 512;
654
655 if (lseek64(fd, offset, 0)< 0LL)
656 return 3;
657
658 if (write(fd, super, sizeof(*super)) != sizeof(*super))
659 return 4;
660
661 if (super->state & (1<<MD_SB_BITMAP_PRESENT)) {
662 struct bitmap_super_s * bm = (struct bitmap_super_s*)(super+1);
663 if (__le32_to_cpu(bm->magic) == BITMAP_MAGIC)
664 if (write(fd, bm, sizeof(*bm)) != sizeof(*bm))
665 return 5;
666 }
667
668 fsync(fd);
669 return 0;
670 }
671
672 static int write_init_super0(struct supertype *st,
673 mdu_disk_info_t *dinfo, char *devname)
674 {
675 mdp_super_t *sb = st->sb;
676 int fd = open(devname, O_RDWR|O_EXCL);
677 int rv;
678
679 if (fd < 0) {
680 fprintf(stderr, Name ": Failed to open %s to write superblock\n", devname);
681 return -1;
682 }
683
684 sb->disks[dinfo->number].state &= ~(1<<MD_DISK_FAULTY);
685
686 sb->this_disk = sb->disks[dinfo->number];
687 sb->sb_csum = calc_sb0_csum(sb);
688 rv = store_super0(st, fd);
689
690 if (rv == 0 && (sb->state & (1<<MD_SB_BITMAP_PRESENT)))
691 rv = st->ss->write_bitmap(st, fd);
692
693 close(fd);
694 if (rv)
695 fprintf(stderr, Name ": failed to write superblock to %s\n", devname);
696 return rv;
697 }
698
699 static int compare_super0(struct supertype *st, struct supertype *tst)
700 {
701 /*
702 * return:
703 * 0 same, or first was empty, and second was copied
704 * 1 second had wrong number
705 * 2 wrong uuid
706 * 3 wrong other info
707 */
708 mdp_super_t *first = st->sb;
709 mdp_super_t *second = tst->sb;
710 int uuid1[4], uuid2[4];
711
712 if (second->md_magic != MD_SB_MAGIC)
713 return 1;
714 if (!first) {
715 first = malloc(MD_SB_BYTES + sizeof(struct bitmap_super_s));
716 memcpy(first, second, MD_SB_BYTES + sizeof(struct bitmap_super_s));
717 st->sb = first;
718 return 0;
719 }
720
721 uuid_from_super0(st, uuid1);
722 uuid_from_super0(tst, uuid2);
723 if (!same_uuid(uuid1, uuid2, 0))
724 return 2;
725 if (first->major_version != second->major_version ||
726 first->minor_version != second->minor_version ||
727 first->patch_version != second->patch_version ||
728 first->gvalid_words != second->gvalid_words ||
729 first->ctime != second->ctime ||
730 first->level != second->level ||
731 first->size != second->size ||
732 first->raid_disks != second->raid_disks )
733 return 3;
734
735 return 0;
736 }
737
738
739 static void free_super0(struct supertype *st);
740
741 static int load_super0(struct supertype *st, int fd, char *devname)
742 {
743 /* try to read in the superblock
744 * Return:
745 * 0 on success
746 * 1 on cannot get superblock
747 * 2 on superblock meaningless
748 */
749 unsigned long long dsize;
750 unsigned long long offset;
751 mdp_super_t *super;
752 int uuid[4];
753 struct bitmap_super_s *bsb;
754
755 free_super0(st);
756
757 if (!get_dev_size(fd, devname, &dsize))
758 return 1;
759
760 if (dsize < MD_RESERVED_SECTORS*512) {
761 if (devname)
762 fprintf(stderr, Name
763 ": %s is too small for md: size is %llu sectors.\n",
764 devname, dsize);
765 return 1;
766 }
767
768 offset = MD_NEW_SIZE_SECTORS(dsize>>9);
769
770 offset *= 512;
771
772 ioctl(fd, BLKFLSBUF, 0); /* make sure we read current data */
773
774 if (lseek64(fd, offset, 0)< 0LL) {
775 if (devname)
776 fprintf(stderr, Name ": Cannot seek to superblock on %s: %s\n",
777 devname, strerror(errno));
778 return 1;
779 }
780
781 super = malloc(MD_SB_BYTES + sizeof(bitmap_super_t));
782
783 if (read(fd, super, sizeof(*super)) != MD_SB_BYTES) {
784 if (devname)
785 fprintf(stderr, Name ": Cannot read superblock on %s\n",
786 devname);
787 free(super);
788 return 1;
789 }
790
791 if (st->ss && st->minor_version == 9)
792 super0_swap_endian(super);
793
794 if (super->md_magic != MD_SB_MAGIC) {
795 if (devname)
796 fprintf(stderr, Name ": No super block found on %s (Expected magic %08x, got %08x)\n",
797 devname, MD_SB_MAGIC, super->md_magic);
798 free(super);
799 return 2;
800 }
801
802 if (super->major_version != 0) {
803 if (devname)
804 fprintf(stderr, Name ": Cannot interpret superblock on %s - version is %d\n",
805 devname, super->major_version);
806 free(super);
807 return 2;
808 }
809 st->sb = super;
810
811 if (st->ss == NULL) {
812 st->ss = &super0;
813 st->minor_version = super->minor_version;
814 st->max_devs = MD_SB_DISKS;
815 }
816
817 /* Now check on the bitmap superblock */
818 if ((super->state & (1<<MD_SB_BITMAP_PRESENT)) == 0)
819 return 0;
820 /* Read the bitmap superblock and make sure it looks
821 * valid. If it doesn't clear the bit. An --assemble --force
822 * should get that written out.
823 */
824 if (read(fd, super+1, sizeof(struct bitmap_super_s))
825 != sizeof(struct bitmap_super_s))
826 goto no_bitmap;
827
828 uuid_from_super0(st, uuid);
829 bsb = (struct bitmap_super_s *)(super+1);
830 if (__le32_to_cpu(bsb->magic) != BITMAP_MAGIC ||
831 memcmp(bsb->uuid, uuid, 16) != 0)
832 goto no_bitmap;
833 return 0;
834
835 no_bitmap:
836 super->state &= ~(1<<MD_SB_BITMAP_PRESENT);
837
838 return 0;
839 }
840
841 static struct supertype *match_metadata_desc0(char *arg)
842 {
843 struct supertype *st = malloc(sizeof(*st));
844 if (!st) return st;
845
846 st->ss = &super0;
847 st->minor_version = 90;
848 st->max_devs = MD_SB_DISKS;
849 st->sb = NULL;
850 if (strcmp(arg, "0") == 0 ||
851 strcmp(arg, "0.90") == 0 ||
852 strcmp(arg, "0.91") == 0 ||
853 strcmp(arg, "default") == 0
854 )
855 return st;
856
857 st->minor_version = 9; /* flag for 'byte-swapped' */
858 if (strcmp(arg, "0.swap")==0)
859 return st;
860
861 free(st);
862 return NULL;
863 }
864
865 static __u64 avail_size0(struct supertype *st, __u64 devsize)
866 {
867 if (devsize < MD_RESERVED_SECTORS)
868 return 0ULL;
869 return MD_NEW_SIZE_SECTORS(devsize);
870 }
871
872 static int add_internal_bitmap0(struct supertype *st, int *chunkp,
873 int delay, int write_behind,
874 unsigned long long size, int may_change,
875 int major)
876 {
877 /*
878 * The bitmap comes immediately after the superblock and must be 60K in size
879 * at most. The default size is between 30K and 60K
880 *
881 * size is in sectors, chunk is in bytes !!!
882 */
883 unsigned long long bits;
884 unsigned long long max_bits = 60*1024*8;
885 unsigned long long min_chunk;
886 int chunk = *chunkp;
887 mdp_super_t *sb = st->sb;
888 bitmap_super_t *bms = (bitmap_super_t*)(((char*)sb) + MD_SB_BYTES);
889
890
891 min_chunk = 4096; /* sub-page chunks don't work yet.. */
892 bits = (size * 512) / min_chunk + 1;
893 while (bits > max_bits) {
894 min_chunk *= 2;
895 bits = (bits+1)/2;
896 }
897 if (chunk == UnSet)
898 chunk = min_chunk;
899 else if (chunk < min_chunk)
900 return 0; /* chunk size too small */
901
902 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
903
904 memset(bms, 0, sizeof(*bms));
905 bms->magic = __cpu_to_le32(BITMAP_MAGIC);
906 bms->version = __cpu_to_le32(major);
907 uuid_from_super0(st, (int*)bms->uuid);
908 bms->chunksize = __cpu_to_le32(chunk);
909 bms->daemon_sleep = __cpu_to_le32(delay);
910 bms->sync_size = __cpu_to_le64(size);
911 bms->write_behind = __cpu_to_le32(write_behind);
912 *chunkp = chunk;
913 return 1;
914 }
915
916
917 void locate_bitmap0(struct supertype *st, int fd)
918 {
919 unsigned long long dsize;
920 unsigned long long offset;
921
922 if (!get_dev_size(fd, NULL, &dsize))
923 return;
924
925 if (dsize < MD_RESERVED_SECTORS*512)
926 return;
927
928 offset = MD_NEW_SIZE_SECTORS(dsize>>9);
929
930 offset *= 512;
931
932 offset += MD_SB_BYTES;
933
934 lseek64(fd, offset, 0);
935 }
936
937 int write_bitmap0(struct supertype *st, int fd)
938 {
939 unsigned long long dsize;
940 unsigned long long offset;
941 mdp_super_t *sb = st->sb;
942
943 int rv = 0;
944
945 int towrite, n;
946 char buf[4096];
947
948 if (!get_dev_size(fd, NULL, &dsize))
949 return 1;
950
951
952 if (dsize < MD_RESERVED_SECTORS*512)
953 return -1;
954
955 offset = MD_NEW_SIZE_SECTORS(dsize>>9);
956
957 offset *= 512;
958
959 if (lseek64(fd, offset + 4096, 0)< 0LL)
960 return 3;
961
962
963 if (write(fd, ((char*)sb)+MD_SB_BYTES, sizeof(bitmap_super_t)) !=
964 sizeof(bitmap_super_t))
965 return -2;
966 towrite = 64*1024 - MD_SB_BYTES - sizeof(bitmap_super_t);
967 memset(buf, 0xff, sizeof(buf));
968 while (towrite > 0) {
969 n = towrite;
970 if (n > sizeof(buf))
971 n = sizeof(buf);
972 n = write(fd, buf, n);
973 if (n > 0)
974 towrite -= n;
975 else
976 break;
977 }
978 fsync(fd);
979 if (towrite)
980 rv = -2;
981
982 return rv;
983 }
984
985 static void free_super0(struct supertype *st)
986 {
987 if (st->sb)
988 free(st->sb);
989 st->sb = NULL;
990 }
991
992 struct superswitch super0 = {
993 #ifndef MDASSEMBLE
994 .examine_super = examine_super0,
995 .brief_examine_super = brief_examine_super0,
996 .export_examine_super = export_examine_super0,
997 .detail_super = detail_super0,
998 .brief_detail_super = brief_detail_super0,
999 .export_detail_super = export_detail_super0,
1000 #endif
1001 .match_home = match_home0,
1002 .uuid_from_super = uuid_from_super0,
1003 .getinfo_super = getinfo_super0,
1004 .update_super = update_super0,
1005 .init_super = init_super0,
1006 .add_to_super = add_to_super0,
1007 .store_super = store_super0,
1008 .write_init_super = write_init_super0,
1009 .compare_super = compare_super0,
1010 .load_super = load_super0,
1011 .match_metadata_desc = match_metadata_desc0,
1012 .avail_size = avail_size0,
1013 .add_internal_bitmap = add_internal_bitmap0,
1014 .locate_bitmap = locate_bitmap0,
1015 .write_bitmap = write_bitmap0,
1016 .free_super = free_super0,
1017 .major = 0,
1018 .swapuuid = 0,
1019 };
Unnamed repository; edit this file 'description' to name the repository.