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Detail: export MD_UUID from mapfile
[thirdparty/mdadm.git] / super0.c
1 /*
2 * mdadm - manage Linux "md" devices aka RAID arrays.
3 *
4 * Copyright (C) 2001-2009 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@suse.de>
23 */
24
25 #define HAVE_STDINT_H 1
26 #include "mdadm.h"
27 #include "sha1.h"
28 /*
29 * All handling for the 0.90.0 version superblock is in
30 * this file.
31 * This includes:
32 * - finding, loading, and writing the superblock.
33 * - initialising a new superblock
34 * - printing the superblock for --examine
35 * - printing part of the superblock for --detail
36 * .. other stuff
37 */
38
39
40 static unsigned long calc_sb0_csum(mdp_super_t *super)
41 {
42 unsigned long csum = super->sb_csum;
43 unsigned long newcsum;
44 super->sb_csum= 0 ;
45 newcsum = calc_csum(super, MD_SB_BYTES);
46 super->sb_csum = csum;
47 return newcsum;
48 }
49
50
51 static void super0_swap_endian(struct mdp_superblock_s *sb)
52 {
53 /* as super0 superblocks are host-endian, it is sometimes
54 * useful to be able to swap the endianness
55 * as (almost) everything is u32's we byte-swap every 4byte
56 * number.
57 * We then also have to swap the events_hi and events_lo
58 */
59 char *sbc = (char *)sb;
60 __u32 t32;
61 int i;
62
63 for (i=0; i < MD_SB_BYTES ; i+=4) {
64 char t = sbc[i];
65 sbc[i] = sbc[i+3];
66 sbc[i+3] = t;
67 t=sbc[i+1];
68 sbc[i+1]=sbc[i+2];
69 sbc[i+2]=t;
70 }
71 t32 = sb->events_hi;
72 sb->events_hi = sb->events_lo;
73 sb->events_lo = t32;
74
75 t32 = sb->cp_events_hi;
76 sb->cp_events_hi = sb->cp_events_lo;
77 sb->cp_events_lo = t32;
78
79 }
80
81 #ifndef MDASSEMBLE
82
83 static void examine_super0(struct supertype *st, char *homehost)
84 {
85 mdp_super_t *sb = st->sb;
86 time_t atime;
87 int d;
88 char *c;
89
90 printf(" Magic : %08x\n", sb->md_magic);
91 printf(" Version : %d.%02d.%02d\n", sb->major_version, sb->minor_version,
92 sb->patch_version);
93 if (sb->minor_version >= 90) {
94 printf(" UUID : %08x:%08x:%08x:%08x", sb->set_uuid0, sb->set_uuid1,
95 sb->set_uuid2, sb->set_uuid3);
96 if (homehost) {
97 char buf[20];
98 void *hash = sha1_buffer(homehost,
99 strlen(homehost),
100 buf);
101 if (memcmp(&sb->set_uuid2, hash, 8)==0)
102 printf(" (local to host %s)", homehost);
103 }
104 printf("\n");
105 } else
106 printf(" UUID : %08x\n", sb->set_uuid0);
107
108 if (sb->not_persistent)
109 printf(" Eedk : not persistent\n");
110
111 atime = sb->ctime;
112 printf(" Creation Time : %.24s\n", ctime(&atime));
113 c=map_num(pers, sb->level);
114 printf(" Raid Level : %s\n", c?c:"-unknown-");
115 if ((int)sb->level >= 0) {
116 int ddsks=0;
117 printf(" Used Dev Size : %d%s\n", sb->size,
118 human_size((long long)sb->size<<10));
119 switch(sb->level) {
120 case 1: ddsks=1;break;
121 case 4:
122 case 5: ddsks = sb->raid_disks-1; break;
123 case 6: ddsks = sb->raid_disks-2; break;
124 case 10: ddsks = sb->raid_disks / (sb->layout&255) / ((sb->layout>>8)&255);
125 }
126 if (ddsks)
127 printf(" Array Size : %llu%s\n", (unsigned long long)ddsks * sb->size,
128 human_size(ddsks*(long long)sb->size<<10));
129 }
130 printf(" Raid Devices : %d\n", sb->raid_disks);
131 printf(" Total Devices : %d\n", sb->nr_disks);
132 printf("Preferred Minor : %d\n", sb->md_minor);
133 printf("\n");
134 if (sb->minor_version > 90 && (sb->reshape_position+1) != 0) {
135 printf(" Reshape pos'n : %llu%s\n", (unsigned long long)sb->reshape_position/2, human_size((long long)sb->reshape_position<<9));
136 if (sb->delta_disks) {
137 printf(" Delta Devices : %d", sb->delta_disks);
138 if (sb->delta_disks)
139 printf(" (%d->%d)\n", sb->raid_disks-sb->delta_disks, sb->raid_disks);
140 else
141 printf(" (%d->%d)\n", sb->raid_disks, sb->raid_disks+sb->delta_disks);
142 }
143 if (sb->new_level != sb->level) {
144 c = map_num(pers, sb->new_level);
145 printf(" New Level : %s\n", c?c:"-unknown-");
146 }
147 if (sb->new_layout != sb->layout) {
148 if (sb->level == 5) {
149 c = map_num(r5layout, sb->new_layout);
150 printf(" New Layout : %s\n", c?c:"-unknown-");
151 }
152 if (sb->level == 10) {
153 printf(" New Layout : near=%d, %s=%d\n",
154 sb->new_layout&255,
155 (sb->new_layout&0x10000)?"offset":"far",
156 (sb->new_layout>>8)&255);
157 }
158 }
159 if (sb->new_chunk != sb->chunk_size)
160 printf(" New Chunksize : %d\n", sb->new_chunk);
161 printf("\n");
162 }
163 atime = sb->utime;
164 printf(" Update Time : %.24s\n", ctime(&atime));
165 printf(" State : %s\n",
166 (sb->state&(1<<MD_SB_CLEAN))?"clean":"active");
167 if (sb->state & (1<<MD_SB_BITMAP_PRESENT))
168 printf("Internal Bitmap : present\n");
169 printf(" Active Devices : %d\n", sb->active_disks);
170 printf("Working Devices : %d\n", sb->working_disks);
171 printf(" Failed Devices : %d\n", sb->failed_disks);
172 printf(" Spare Devices : %d\n", sb->spare_disks);
173 if (calc_sb0_csum(sb) == sb->sb_csum)
174 printf(" Checksum : %x - correct\n", sb->sb_csum);
175 else
176 printf(" Checksum : %x - expected %lx\n", sb->sb_csum, calc_sb0_csum(sb));
177 printf(" Events : %llu\n",
178 ((unsigned long long)sb->events_hi << 32)
179 + sb->events_lo);
180 printf("\n");
181 if (sb->level == 5) {
182 c = map_num(r5layout, sb->layout);
183 printf(" Layout : %s\n", c?c:"-unknown-");
184 }
185 if (sb->level == 10) {
186 printf(" Layout :");
187 print_r10_layout(sb->layout);
188 printf("\n");
189 }
190 switch(sb->level) {
191 case 0:
192 case 4:
193 case 5:
194 case 6:
195 case 10:
196 printf(" Chunk Size : %dK\n", sb->chunk_size/1024);
197 break;
198 case -1:
199 printf(" Rounding : %dK\n", sb->chunk_size/1024);
200 break;
201 default: break;
202 }
203 printf("\n");
204 printf(" Number Major Minor RaidDevice State\n");
205 for (d= -1; d<(signed int)(sb->raid_disks+sb->spare_disks); d++) {
206 mdp_disk_t *dp;
207 char *dv;
208 char nb[5];
209 int wonly;
210 if (d>=0) dp = &sb->disks[d];
211 else dp = &sb->this_disk;
212 snprintf(nb, sizeof(nb), "%4d", d);
213 printf("%4s %5d %5d %5d %5d ", d < 0 ? "this" : nb,
214 dp->number, dp->major, dp->minor, dp->raid_disk);
215 wonly = dp->state & (1<<MD_DISK_WRITEMOSTLY);
216 dp->state &= ~(1<<MD_DISK_WRITEMOSTLY);
217 if (dp->state & (1<<MD_DISK_FAULTY)) printf(" faulty");
218 if (dp->state & (1<<MD_DISK_ACTIVE)) printf(" active");
219 if (dp->state & (1<<MD_DISK_SYNC)) printf(" sync");
220 if (dp->state & (1<<MD_DISK_REMOVED)) printf(" removed");
221 if (wonly) printf(" write-mostly");
222 if (dp->state == 0) printf(" spare");
223 if ((dv=map_dev(dp->major, dp->minor, 0)))
224 printf(" %s", dv);
225 printf("\n");
226 if (d == -1) printf("\n");
227 }
228 }
229
230 static void brief_examine_super0(struct supertype *st, int verbose)
231 {
232 mdp_super_t *sb = st->sb;
233 char *c=map_num(pers, sb->level);
234 char devname[20];
235
236 sprintf(devname, "/dev/md%d", sb->md_minor);
237
238 if (verbose) {
239 printf("ARRAY %s level=%s num-devices=%d",
240 devname,
241 c?c:"-unknown-", sb->raid_disks);
242 } else
243 printf("ARRAY %s", devname);
244
245 if (sb->minor_version >= 90)
246 printf(" UUID=%08x:%08x:%08x:%08x", sb->set_uuid0, sb->set_uuid1,
247 sb->set_uuid2, sb->set_uuid3);
248 else
249 printf(" UUID=%08x", sb->set_uuid0);
250 printf("\n");
251 }
252
253 static void export_examine_super0(struct supertype *st)
254 {
255 mdp_super_t *sb = st->sb;
256
257 printf("MD_LEVEL=%s\n", map_num(pers, sb->level));
258 printf("MD_DEVICES=%d\n", sb->raid_disks);
259 if (sb->minor_version >= 90)
260 printf("MD_UUID=%08x:%08x:%08x:%08x\n",
261 sb->set_uuid0, sb->set_uuid1,
262 sb->set_uuid2, sb->set_uuid3);
263 else
264 printf("MD_UUID=%08x\n", sb->set_uuid0);
265 printf("MD_UPDATE_TIME=%llu\n",
266 __le64_to_cpu(sb->ctime) & 0xFFFFFFFFFFULL);
267 printf("MD_EVENTS=%llu\n",
268 ((unsigned long long)sb->events_hi << 32)
269 + sb->events_lo);
270 }
271
272 static void detail_super0(struct supertype *st, char *homehost)
273 {
274 mdp_super_t *sb = st->sb;
275 printf(" UUID : ");
276 if (sb->minor_version >= 90)
277 printf("%08x:%08x:%08x:%08x", sb->set_uuid0, sb->set_uuid1,
278 sb->set_uuid2, sb->set_uuid3);
279 else
280 printf("%08x", sb->set_uuid0);
281 if (homehost) {
282 char buf[20];
283 void *hash = sha1_buffer(homehost,
284 strlen(homehost),
285 buf);
286 if (memcmp(&sb->set_uuid2, hash, 8)==0)
287 printf(" (local to host %s)", homehost);
288 }
289 printf("\n Events : %d.%d\n\n", sb->events_hi, sb->events_lo);
290 }
291
292 static void brief_detail_super0(struct supertype *st)
293 {
294 mdp_super_t *sb = st->sb;
295 printf(" UUID=");
296 if (sb->minor_version >= 90)
297 printf("%08x:%08x:%08x:%08x", sb->set_uuid0, sb->set_uuid1,
298 sb->set_uuid2, sb->set_uuid3);
299 else
300 printf("%08x", sb->set_uuid0);
301 }
302 #endif
303
304 static int match_home0(struct supertype *st, char *homehost)
305 {
306 mdp_super_t *sb = st->sb;
307 char buf[20];
308 char *hash;
309
310 if (!homehost)
311 return 0;
312 hash = sha1_buffer(homehost,
313 strlen(homehost),
314 buf);
315
316 return (memcmp(&sb->set_uuid2, hash, 8)==0);
317 }
318
319 static void uuid_from_super0(struct supertype *st, int uuid[4])
320 {
321 mdp_super_t *super = st->sb;
322 uuid[0] = super->set_uuid0;
323 if (super->minor_version >= 90) {
324 uuid[1] = super->set_uuid1;
325 uuid[2] = super->set_uuid2;
326 uuid[3] = super->set_uuid3;
327 } else {
328 uuid[1] = 0;
329 uuid[2] = 0;
330 uuid[3] = 0;
331 }
332 }
333
334 static void getinfo_super0(struct supertype *st, struct mdinfo *info)
335 {
336 mdp_super_t *sb = st->sb;
337 int working = 0;
338 int i;
339
340 info->array.major_version = sb->major_version;
341 info->array.minor_version = sb->minor_version;
342 info->array.patch_version = sb->patch_version;
343 info->array.raid_disks = sb->raid_disks;
344 info->array.level = sb->level;
345 info->array.layout = sb->layout;
346 info->array.md_minor = sb->md_minor;
347 info->array.ctime = sb->ctime;
348 info->array.utime = sb->utime;
349 info->array.chunk_size = sb->chunk_size;
350 info->array.state = sb->state;
351 info->component_size = sb->size*2;
352
353 info->disk.state = sb->this_disk.state;
354 info->disk.major = sb->this_disk.major;
355 info->disk.minor = sb->this_disk.minor;
356 info->disk.raid_disk = sb->this_disk.raid_disk;
357 info->disk.number = sb->this_disk.number;
358
359 info->events = md_event(sb);
360 info->data_offset = 0;
361
362 sprintf(info->text_version, "0.%d", sb->minor_version);
363 info->safe_mode_delay = 200;
364
365 uuid_from_super0(st, info->uuid);
366
367 if (sb->minor_version > 90 && (sb->reshape_position+1) != 0) {
368 info->reshape_active = 1;
369 info->reshape_progress = sb->reshape_position;
370 info->new_level = sb->new_level;
371 info->delta_disks = sb->delta_disks;
372 info->new_layout = sb->new_layout;
373 info->new_chunk = sb->new_chunk;
374 } else
375 info->reshape_active = 0;
376
377 sprintf(info->name, "%d", sb->md_minor);
378 /* work_disks is calculated rather than read directly */
379 for (i=0; i < MD_SB_DISKS; i++)
380 if ((sb->disks[i].state & (1<<MD_DISK_SYNC)) &&
381 (sb->disks[i].raid_disk < info->array.raid_disks) &&
382 (sb->disks[i].state & (1<<MD_DISK_ACTIVE)) &&
383 !(sb->disks[i].state & (1<<MD_DISK_FAULTY)))
384 working ++;
385 info->array.working_disks = working;
386 }
387
388
389 static int update_super0(struct supertype *st, struct mdinfo *info,
390 char *update,
391 char *devname, int verbose,
392 int uuid_set, char *homehost)
393 {
394 /* NOTE: for 'assemble' and 'force' we need to return non-zero if any change was made.
395 * For others, the return value is ignored.
396 */
397 int rv = 0;
398 mdp_super_t *sb = st->sb;
399 if (strcmp(update, "sparc2.2")==0 ) {
400 /* 2.2 sparc put the events in the wrong place
401 * So we copy the tail of the superblock
402 * up 4 bytes before continuing
403 */
404 __u32 *sb32 = (__u32*)sb;
405 memcpy(sb32+MD_SB_GENERIC_CONSTANT_WORDS+7,
406 sb32+MD_SB_GENERIC_CONSTANT_WORDS+7+1,
407 (MD_SB_WORDS - (MD_SB_GENERIC_CONSTANT_WORDS+7+1))*4);
408 if (verbose >= 0)
409 fprintf (stderr, Name ": adjusting superblock of %s for 2.2/sparc compatability.\n",
410 devname);
411 }
412 if (strcmp(update, "super-minor") ==0) {
413 sb->md_minor = info->array.md_minor;
414 if (verbose > 0)
415 fprintf(stderr, Name ": updating superblock of %s with minor number %d\n",
416 devname, info->array.md_minor);
417 }
418 if (strcmp(update, "summaries") == 0) {
419 int i;
420 /* set nr_disks, active_disks, working_disks,
421 * failed_disks, spare_disks based on disks[]
422 * array in superblock.
423 * Also make sure extra slots aren't 'failed'
424 */
425 sb->nr_disks = sb->active_disks =
426 sb->working_disks = sb->failed_disks =
427 sb->spare_disks = 0;
428 for (i=0; i < MD_SB_DISKS ; i++)
429 if (sb->disks[i].major ||
430 sb->disks[i].minor) {
431 int state = sb->disks[i].state;
432 if (state & (1<<MD_DISK_REMOVED))
433 continue;
434 sb->nr_disks++;
435 if (state & (1<<MD_DISK_ACTIVE))
436 sb->active_disks++;
437 if (state & (1<<MD_DISK_FAULTY))
438 sb->failed_disks++;
439 else
440 sb->working_disks++;
441 if (state == 0)
442 sb->spare_disks++;
443 } else if (i >= sb->raid_disks && sb->disks[i].number == 0)
444 sb->disks[i].state = 0;
445 }
446 if (strcmp(update, "force-one")==0) {
447 /* Not enough devices for a working array, so
448 * bring this one up-to-date.
449 */
450 __u32 ehi = sb->events_hi, elo = sb->events_lo;
451 sb->events_hi = (info->events>>32) & 0xFFFFFFFF;
452 sb->events_lo = (info->events) & 0xFFFFFFFF;
453 if (sb->events_hi != ehi ||
454 sb->events_lo != elo)
455 rv = 1;
456 }
457 if (strcmp(update, "force-array")==0) {
458 /* degraded array and 'force' requested, so
459 * maybe need to mark it 'clean'
460 */
461 if ((sb->level == 5 || sb->level == 4 || sb->level == 6) &&
462 (sb->state & (1 << MD_SB_CLEAN)) == 0) {
463 /* need to force clean */
464 sb->state |= (1 << MD_SB_CLEAN);
465 rv = 1;
466 }
467 }
468 if (strcmp(update, "assemble")==0) {
469 int d = info->disk.number;
470 int wonly = sb->disks[d].state & (1<<MD_DISK_WRITEMOSTLY);
471 if ((sb->disks[d].state & ~(1<<MD_DISK_WRITEMOSTLY))
472 != info->disk.state) {
473 sb->disks[d].state = info->disk.state | wonly;
474 rv = 1;
475 }
476 }
477 if (strcmp(update, "linear-grow-new") == 0) {
478 memset(&sb->disks[info->disk.number], 0, sizeof(sb->disks[0]));
479 sb->disks[info->disk.number].number = info->disk.number;
480 sb->disks[info->disk.number].major = info->disk.major;
481 sb->disks[info->disk.number].minor = info->disk.minor;
482 sb->disks[info->disk.number].raid_disk = info->disk.raid_disk;
483 sb->disks[info->disk.number].state = info->disk.state;
484 sb->this_disk = sb->disks[info->disk.number];
485 }
486 if (strcmp(update, "linear-grow-update") == 0) {
487 sb->raid_disks = info->array.raid_disks;
488 sb->nr_disks = info->array.nr_disks;
489 sb->active_disks = info->array.active_disks;
490 sb->working_disks = info->array.working_disks;
491 memset(&sb->disks[info->disk.number], 0, sizeof(sb->disks[0]));
492 sb->disks[info->disk.number].number = info->disk.number;
493 sb->disks[info->disk.number].major = info->disk.major;
494 sb->disks[info->disk.number].minor = info->disk.minor;
495 sb->disks[info->disk.number].raid_disk = info->disk.raid_disk;
496 sb->disks[info->disk.number].state = info->disk.state;
497 }
498 if (strcmp(update, "resync") == 0) {
499 /* make sure resync happens */
500 sb->state &= ~(1<<MD_SB_CLEAN);
501 sb->recovery_cp = 0;
502 }
503 if (strcmp(update, "homehost") == 0 &&
504 homehost) {
505 uuid_set = 0;
506 update = "uuid";
507 info->uuid[0] = sb->set_uuid0;
508 info->uuid[1] = sb->set_uuid1;
509 }
510 if (strcmp(update, "uuid") == 0) {
511 if (!uuid_set && homehost) {
512 char buf[20];
513 char *hash = sha1_buffer(homehost,
514 strlen(homehost),
515 buf);
516 memcpy(info->uuid+2, hash, 8);
517 }
518 sb->set_uuid0 = info->uuid[0];
519 sb->set_uuid1 = info->uuid[1];
520 sb->set_uuid2 = info->uuid[2];
521 sb->set_uuid3 = info->uuid[3];
522 if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) {
523 struct bitmap_super_s *bm;
524 bm = (struct bitmap_super_s*)(sb+1);
525 uuid_from_super0(st, (int*)bm->uuid);
526 }
527 }
528 if (strcmp(update, "_reshape_progress")==0)
529 sb->reshape_position = info->reshape_progress;
530
531 sb->sb_csum = calc_sb0_csum(sb);
532 return rv;
533 }
534
535 /*
536 * For verion-0 superblock, the homehost is 'stored' in the
537 * uuid. 8 bytes for a hash of the host leaving 8 bytes
538 * of random material.
539 * We use the first 8 bytes (64bits) of the sha1 of the
540 * host name
541 */
542
543
544 static int init_super0(struct supertype *st, mdu_array_info_t *info,
545 unsigned long long size, char *ignored_name, char *homehost,
546 int *uuid)
547 {
548 mdp_super_t *sb;
549 int spares;
550
551 if (posix_memalign((void**)&sb, 4096,
552 MD_SB_BYTES + ROUND_UP(sizeof(bitmap_super_t), 4096)) != 0) {
553 fprintf(stderr, Name ": %s could not allocate superblock\n", __func__);
554 return 0;
555 }
556 memset(sb, 0, MD_SB_BYTES + sizeof(bitmap_super_t));
557
558 st->sb = sb;
559 if (info == NULL) {
560 /* zeroing the superblock */
561 return 0;
562 }
563
564 spares = info->working_disks - info->active_disks;
565 if (info->raid_disks + spares > MD_SB_DISKS) {
566 fprintf(stderr, Name ": too many devices requested: %d+%d > %d\n",
567 info->raid_disks , spares, MD_SB_DISKS);
568 return 0;
569 }
570
571 sb->md_magic = MD_SB_MAGIC;
572 sb->major_version = 0;
573 sb->minor_version = 90;
574 sb->patch_version = 0;
575 sb->gvalid_words = 0; /* ignored */
576 sb->ctime = time(0);
577 sb->level = info->level;
578 if (size != info->size)
579 return 0;
580 sb->size = info->size;
581 sb->nr_disks = info->nr_disks;
582 sb->raid_disks = info->raid_disks;
583 sb->md_minor = info->md_minor;
584 sb->not_persistent = 0;
585 if (uuid) {
586 sb->set_uuid0 = uuid[0];
587 sb->set_uuid1 = uuid[1];
588 sb->set_uuid2 = uuid[2];
589 sb->set_uuid3 = uuid[3];
590 } else {
591 int rfd = open("/dev/urandom", O_RDONLY);
592 if (rfd < 0 || read(rfd, &sb->set_uuid0, 4) != 4)
593 sb->set_uuid0 = random();
594 if (rfd < 0 || read(rfd, &sb->set_uuid1, 12) != 12) {
595 sb->set_uuid1 = random();
596 sb->set_uuid2 = random();
597 sb->set_uuid3 = random();
598 }
599 if (rfd >= 0)
600 close(rfd);
601 }
602 if (homehost) {
603 char buf[20];
604 char *hash = sha1_buffer(homehost,
605 strlen(homehost),
606 buf);
607 memcpy(&sb->set_uuid2, hash, 8);
608 }
609
610 sb->utime = sb->ctime;
611 sb->state = info->state;
612 sb->active_disks = info->active_disks;
613 sb->working_disks = info->working_disks;
614 sb->failed_disks = info->failed_disks;
615 sb->spare_disks = info->spare_disks;
616 sb->events_hi = 0;
617 sb->events_lo = 1;
618
619 sb->layout = info->layout;
620 sb->chunk_size = info->chunk_size;
621
622 return 1;
623 }
624
625 struct devinfo {
626 int fd;
627 char *devname;
628 mdu_disk_info_t disk;
629 struct devinfo *next;
630 };
631
632 #ifndef MDASSEMBLE
633 /* Add a device to the superblock being created */
634 static int add_to_super0(struct supertype *st, mdu_disk_info_t *dinfo,
635 int fd, char *devname)
636 {
637 mdp_super_t *sb = st->sb;
638 mdp_disk_t *dk = &sb->disks[dinfo->number];
639 struct devinfo *di, **dip;
640
641 dk->number = dinfo->number;
642 dk->major = dinfo->major;
643 dk->minor = dinfo->minor;
644 dk->raid_disk = dinfo->raid_disk;
645 dk->state = dinfo->state;
646
647 sb->this_disk = sb->disks[dinfo->number];
648 sb->sb_csum = calc_sb0_csum(sb);
649
650 dip = (struct devinfo **)&st->info;
651 while (*dip)
652 dip = &(*dip)->next;
653 di = malloc(sizeof(struct devinfo));
654 di->fd = fd;
655 di->devname = devname;
656 di->disk = *dinfo;
657 di->next = NULL;
658 *dip = di;
659
660 return 0;
661 }
662 #endif
663
664 static int store_super0(struct supertype *st, int fd)
665 {
666 unsigned long long dsize;
667 unsigned long long offset;
668 mdp_super_t *super = st->sb;
669
670 if (!get_dev_size(fd, NULL, &dsize))
671 return 1;
672
673 if (dsize < MD_RESERVED_SECTORS*512)
674 return 2;
675
676 offset = MD_NEW_SIZE_SECTORS(dsize>>9);
677
678 offset *= 512;
679
680 if (lseek64(fd, offset, 0)< 0LL)
681 return 3;
682
683 if (write(fd, super, sizeof(*super)) != sizeof(*super))
684 return 4;
685
686 if (super->state & (1<<MD_SB_BITMAP_PRESENT)) {
687 struct bitmap_super_s * bm = (struct bitmap_super_s*)(super+1);
688 if (__le32_to_cpu(bm->magic) == BITMAP_MAGIC)
689 if (write(fd, bm, ROUND_UP(sizeof(*bm),4096)) !=
690 ROUND_UP(sizeof(*bm),4096))
691 return 5;
692 }
693
694 fsync(fd);
695 return 0;
696 }
697
698 #ifndef MDASSEMBLE
699 static int write_init_super0(struct supertype *st)
700 {
701 mdp_super_t *sb = st->sb;
702 int rv = 0;
703 struct devinfo *di;
704
705 for (di = st->info ; di && ! rv ; di = di->next) {
706
707 if (di->disk.state == 1)
708 continue;
709 if (di->fd == -1)
710 continue;
711 Kill(di->devname, 0, 1, 1);
712 Kill(di->devname, 0, 1, 1);
713
714 sb->disks[di->disk.number].state &= ~(1<<MD_DISK_FAULTY);
715
716 sb->this_disk = sb->disks[di->disk.number];
717 sb->sb_csum = calc_sb0_csum(sb);
718 rv = store_super0(st, di->fd);
719
720 if (rv == 0 && (sb->state & (1<<MD_SB_BITMAP_PRESENT)))
721 rv = st->ss->write_bitmap(st, di->fd);
722
723 if (rv)
724 fprintf(stderr,
725 Name ": failed to write superblock to %s\n",
726 di->devname);
727 close(di->fd);
728 di->fd = -1;
729 }
730 return rv;
731 }
732 #endif
733
734 static int compare_super0(struct supertype *st, struct supertype *tst)
735 {
736 /*
737 * return:
738 * 0 same, or first was empty, and second was copied
739 * 1 second had wrong number
740 * 2 wrong uuid
741 * 3 wrong other info
742 */
743 mdp_super_t *first = st->sb;
744 mdp_super_t *second = tst->sb;
745 int uuid1[4], uuid2[4];
746
747 if (second->md_magic != MD_SB_MAGIC)
748 return 1;
749 if (!first) {
750 if (posix_memalign((void**)&first, 4096,
751 MD_SB_BYTES +
752 ROUND_UP(sizeof(struct bitmap_super_s), 4096)) != 0) {
753 fprintf(stderr, Name
754 ": %s could not allocate superblock\n", __func__);
755 return 1;
756 }
757 memcpy(first, second, MD_SB_BYTES + sizeof(struct bitmap_super_s));
758 st->sb = first;
759 return 0;
760 }
761
762 uuid_from_super0(st, uuid1);
763 uuid_from_super0(tst, uuid2);
764 if (!same_uuid(uuid1, uuid2, 0))
765 return 2;
766 if (first->major_version != second->major_version ||
767 first->minor_version != second->minor_version ||
768 first->patch_version != second->patch_version ||
769 first->gvalid_words != second->gvalid_words ||
770 first->ctime != second->ctime ||
771 first->level != second->level ||
772 first->size != second->size ||
773 first->raid_disks != second->raid_disks )
774 return 3;
775
776 return 0;
777 }
778
779
780 static void free_super0(struct supertype *st);
781
782 static int load_super0(struct supertype *st, int fd, char *devname)
783 {
784 /* try to read in the superblock
785 * Return:
786 * 0 on success
787 * 1 on cannot get superblock
788 * 2 on superblock meaningless
789 */
790 unsigned long long dsize;
791 unsigned long long offset;
792 mdp_super_t *super;
793 int uuid[4];
794 struct bitmap_super_s *bsb;
795
796 free_super0(st);
797
798 if (st->subarray[0])
799 return 1;
800
801 if (!get_dev_size(fd, devname, &dsize))
802 return 1;
803
804 if (dsize < MD_RESERVED_SECTORS*512) {
805 if (devname)
806 fprintf(stderr, Name
807 ": %s is too small for md: size is %llu sectors.\n",
808 devname, dsize);
809 return 1;
810 }
811
812 offset = MD_NEW_SIZE_SECTORS(dsize>>9);
813
814 offset *= 512;
815
816 ioctl(fd, BLKFLSBUF, 0); /* make sure we read current data */
817
818 if (lseek64(fd, offset, 0)< 0LL) {
819 if (devname)
820 fprintf(stderr, Name ": Cannot seek to superblock on %s: %s\n",
821 devname, strerror(errno));
822 return 1;
823 }
824
825 if (posix_memalign((void**)&super, 4096,
826 MD_SB_BYTES +
827 ROUND_UP(sizeof(bitmap_super_t), 4096)) != 0) {
828 fprintf(stderr, Name
829 ": %s could not allocate superblock\n", __func__);
830 return 1;
831 }
832
833 if (read(fd, super, sizeof(*super)) != MD_SB_BYTES) {
834 if (devname)
835 fprintf(stderr, Name ": Cannot read superblock on %s\n",
836 devname);
837 free(super);
838 return 1;
839 }
840
841 if (st->ss && st->minor_version == 9)
842 super0_swap_endian(super);
843
844 if (super->md_magic != MD_SB_MAGIC) {
845 if (devname)
846 fprintf(stderr, Name ": No super block found on %s (Expected magic %08x, got %08x)\n",
847 devname, MD_SB_MAGIC, super->md_magic);
848 free(super);
849 return 2;
850 }
851
852 if (super->major_version != 0) {
853 if (devname)
854 fprintf(stderr, Name ": Cannot interpret superblock on %s - version is %d\n",
855 devname, super->major_version);
856 free(super);
857 return 2;
858 }
859 st->sb = super;
860
861 if (st->ss == NULL) {
862 st->ss = &super0;
863 st->minor_version = super->minor_version;
864 st->max_devs = MD_SB_DISKS;
865 st->info = NULL;
866 }
867
868 /* Now check on the bitmap superblock */
869 if ((super->state & (1<<MD_SB_BITMAP_PRESENT)) == 0)
870 return 0;
871 /* Read the bitmap superblock and make sure it looks
872 * valid. If it doesn't clear the bit. An --assemble --force
873 * should get that written out.
874 */
875 if (read(fd, super+1, ROUND_UP(sizeof(struct bitmap_super_s),4096))
876 != ROUND_UP(sizeof(struct bitmap_super_s),4096))
877 goto no_bitmap;
878
879 uuid_from_super0(st, uuid);
880 bsb = (struct bitmap_super_s *)(super+1);
881 if (__le32_to_cpu(bsb->magic) != BITMAP_MAGIC ||
882 memcmp(bsb->uuid, uuid, 16) != 0)
883 goto no_bitmap;
884 return 0;
885
886 no_bitmap:
887 super->state &= ~(1<<MD_SB_BITMAP_PRESENT);
888
889 return 0;
890 }
891
892 static struct supertype *match_metadata_desc0(char *arg)
893 {
894 struct supertype *st = malloc(sizeof(*st));
895 if (!st) return st;
896
897 memset(st, 0, sizeof(*st));
898 st->ss = &super0;
899 st->info = NULL;
900 st->minor_version = 90;
901 st->max_devs = MD_SB_DISKS;
902 st->sb = NULL;
903 /* we sometimes get 00.90 */
904 while (arg[0] == '0' && arg[1] == '0')
905 arg++;
906 if (strcmp(arg, "0") == 0 ||
907 strcmp(arg, "0.90") == 0 ||
908 strcmp(arg, "default") == 0 ||
909 strcmp(arg, "") == 0 /* no metadata */
910 )
911 return st;
912
913 st->minor_version = 91; /* reshape in progress */
914 if (strcmp(arg, "0.91") == 0) /* For dup_super support */
915 return st;
916
917 st->minor_version = 9; /* flag for 'byte-swapped' */
918 if (strcmp(arg, "0.swap")==0 ||
919 strcmp(arg, "0.9") == 0) /* For dup_super support */
920 return st;
921
922 free(st);
923 return NULL;
924 }
925
926 static __u64 avail_size0(struct supertype *st, __u64 devsize)
927 {
928 if (devsize < MD_RESERVED_SECTORS)
929 return 0ULL;
930 return MD_NEW_SIZE_SECTORS(devsize);
931 }
932
933 static int add_internal_bitmap0(struct supertype *st, int *chunkp,
934 int delay, int write_behind,
935 unsigned long long size, int may_change,
936 int major)
937 {
938 /*
939 * The bitmap comes immediately after the superblock and must be 60K in size
940 * at most. The default size is between 30K and 60K
941 *
942 * size is in sectors, chunk is in bytes !!!
943 */
944 unsigned long long bits;
945 unsigned long long max_bits = 60*1024*8;
946 unsigned long long min_chunk;
947 int chunk = *chunkp;
948 mdp_super_t *sb = st->sb;
949 bitmap_super_t *bms = (bitmap_super_t*)(((char*)sb) + MD_SB_BYTES);
950
951
952 min_chunk = 4096; /* sub-page chunks don't work yet.. */
953 bits = (size * 512) / min_chunk + 1;
954 while (bits > max_bits) {
955 min_chunk *= 2;
956 bits = (bits+1)/2;
957 }
958 if (chunk == UnSet)
959 chunk = min_chunk;
960 else if (chunk < min_chunk)
961 return 0; /* chunk size too small */
962
963 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
964
965 memset(bms, 0, sizeof(*bms));
966 bms->magic = __cpu_to_le32(BITMAP_MAGIC);
967 bms->version = __cpu_to_le32(major);
968 uuid_from_super0(st, (int*)bms->uuid);
969 bms->chunksize = __cpu_to_le32(chunk);
970 bms->daemon_sleep = __cpu_to_le32(delay);
971 bms->sync_size = __cpu_to_le64(size);
972 bms->write_behind = __cpu_to_le32(write_behind);
973 *chunkp = chunk;
974 return 1;
975 }
976
977
978 static void locate_bitmap0(struct supertype *st, int fd)
979 {
980 unsigned long long dsize;
981 unsigned long long offset;
982
983 if (!get_dev_size(fd, NULL, &dsize))
984 return;
985
986 if (dsize < MD_RESERVED_SECTORS*512)
987 return;
988
989 offset = MD_NEW_SIZE_SECTORS(dsize>>9);
990
991 offset *= 512;
992
993 offset += MD_SB_BYTES;
994
995 lseek64(fd, offset, 0);
996 }
997
998 static int write_bitmap0(struct supertype *st, int fd)
999 {
1000 unsigned long long dsize;
1001 unsigned long long offset;
1002 mdp_super_t *sb = st->sb;
1003
1004 int rv = 0;
1005
1006 int towrite, n;
1007 char abuf[4096+4096];
1008 char *buf = (char*)(((long)(abuf+4096))&~4095L);
1009
1010 if (!get_dev_size(fd, NULL, &dsize))
1011 return 1;
1012
1013
1014 if (dsize < MD_RESERVED_SECTORS*512)
1015 return -1;
1016
1017 offset = MD_NEW_SIZE_SECTORS(dsize>>9);
1018
1019 offset *= 512;
1020
1021 if (lseek64(fd, offset + 4096, 0)< 0LL)
1022 return 3;
1023
1024 memset(buf, 0xff, 4096);
1025 memcpy(buf, ((char*)sb)+MD_SB_BYTES, sizeof(bitmap_super_t));
1026 towrite = 64*1024;
1027 while (towrite > 0) {
1028 n = towrite;
1029 if (n > 4096)
1030 n = 4096;
1031 n = write(fd, buf, n);
1032 if (n > 0)
1033 towrite -= n;
1034 else
1035 break;
1036 memset(buf, 0xff, 4096);
1037 }
1038 fsync(fd);
1039 if (towrite)
1040 rv = -2;
1041
1042 return rv;
1043 }
1044
1045 static void free_super0(struct supertype *st)
1046 {
1047 if (st->sb)
1048 free(st->sb);
1049 st->sb = NULL;
1050 }
1051
1052 #ifndef MDASSEMBLE
1053 static int validate_geometry0(struct supertype *st, int level,
1054 int layout, int raiddisks,
1055 int chunk, unsigned long long size,
1056 char *subdev, unsigned long long *freesize,
1057 int verbose)
1058 {
1059 unsigned long long ldsize;
1060 int fd;
1061
1062 if (level == LEVEL_CONTAINER)
1063 return 0;
1064 if (raiddisks > MD_SB_DISKS)
1065 return 0;
1066 if (size > (0x7fffffffULL<<9))
1067 return 0;
1068 if (!subdev)
1069 return 1;
1070
1071 fd = open(subdev, O_RDONLY|O_EXCL, 0);
1072 if (fd < 0) {
1073 if (verbose)
1074 fprintf(stderr, Name ": super0.90 cannot open %s: %s\n",
1075 subdev, strerror(errno));
1076 return 0;
1077 }
1078
1079 if (!get_dev_size(fd, subdev, &ldsize)) {
1080 close(fd);
1081 return 0;
1082 }
1083 close(fd);
1084
1085 if (ldsize < MD_RESERVED_SECTORS * 512)
1086 return 0;
1087 if (size > (0x7fffffffULL<<9))
1088 return 0;
1089 *freesize = MD_NEW_SIZE_SECTORS(ldsize >> 9);
1090 return 1;
1091 }
1092 #endif /* MDASSEMBLE */
1093
1094 struct superswitch super0 = {
1095 #ifndef MDASSEMBLE
1096 .examine_super = examine_super0,
1097 .brief_examine_super = brief_examine_super0,
1098 .export_examine_super = export_examine_super0,
1099 .detail_super = detail_super0,
1100 .brief_detail_super = brief_detail_super0,
1101 .write_init_super = write_init_super0,
1102 .validate_geometry = validate_geometry0,
1103 .add_to_super = add_to_super0,
1104 #endif
1105 .match_home = match_home0,
1106 .uuid_from_super = uuid_from_super0,
1107 .getinfo_super = getinfo_super0,
1108 .update_super = update_super0,
1109 .init_super = init_super0,
1110 .store_super = store_super0,
1111 .compare_super = compare_super0,
1112 .load_super = load_super0,
1113 .match_metadata_desc = match_metadata_desc0,
1114 .avail_size = avail_size0,
1115 .add_internal_bitmap = add_internal_bitmap0,
1116 .locate_bitmap = locate_bitmap0,
1117 .write_bitmap = write_bitmap0,
1118 .free_super = free_super0,
1119 .name = "0.90",
1120 };
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