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Print 'Events' more sensibly.
[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 detail_super0(struct supertype *st, char *homehost)
256 {
257 mdp_super_t *sb = st->sb;
258 printf(" UUID : ");
259 if (sb->minor_version >= 90)
260 printf("%08x:%08x:%08x:%08x", sb->set_uuid0, sb->set_uuid1,
261 sb->set_uuid2, sb->set_uuid3);
262 else
263 printf("%08x", sb->set_uuid0);
264 if (homehost) {
265 char buf[20];
266 void *hash = sha1_buffer(homehost,
267 strlen(homehost),
268 buf);
269 if (memcmp(&sb->set_uuid2, hash, 8)==0)
270 printf(" (local to host %s)", homehost);
271 }
272 printf("\n Events : %d.%d\n\n", sb->events_hi, sb->events_lo);
273 }
274
275 static void brief_detail_super0(struct supertype *st)
276 {
277 mdp_super_t *sb = st->sb;
278 printf(" UUID=");
279 if (sb->minor_version >= 90)
280 printf("%08x:%08x:%08x:%08x", sb->set_uuid0, sb->set_uuid1,
281 sb->set_uuid2, sb->set_uuid3);
282 else
283 printf("%08x", sb->set_uuid0);
284 }
285
286 static void export_super0(struct supertype *st)
287 {
288 mdp_super_t *sb = st->sb;
289 printf("MD_UUID=");
290 if (sb->minor_version >= 90)
291 printf("%08x:%08x:%08x:%08x", sb->set_uuid0, sb->set_uuid1,
292 sb->set_uuid2, sb->set_uuid3);
293 else
294 printf("%08x", sb->set_uuid0);
295 printf("\n");
296 }
297 #endif
298
299 static int match_home0(struct supertype *st, char *homehost)
300 {
301 mdp_super_t *sb = st->sb;
302 char buf[20];
303 char *hash = sha1_buffer(homehost,
304 strlen(homehost),
305 buf);
306
307 return (memcmp(&sb->set_uuid2, hash, 8)==0);
308 }
309
310 static void uuid_from_super0(struct supertype *st, int uuid[4])
311 {
312 mdp_super_t *super = st->sb;
313 uuid[0] = super->set_uuid0;
314 if (super->minor_version >= 90) {
315 uuid[1] = super->set_uuid1;
316 uuid[2] = super->set_uuid2;
317 uuid[3] = super->set_uuid3;
318 } else {
319 uuid[1] = 0;
320 uuid[2] = 0;
321 uuid[3] = 0;
322 }
323 }
324
325 static void getinfo_super0(struct supertype *st, struct mdinfo *info)
326 {
327 mdp_super_t *sb = st->sb;
328 int working = 0;
329 int i;
330
331 info->array.major_version = sb->major_version;
332 info->array.minor_version = sb->minor_version;
333 info->array.patch_version = sb->patch_version;
334 info->array.raid_disks = sb->raid_disks;
335 info->array.level = sb->level;
336 info->array.layout = sb->layout;
337 info->array.md_minor = sb->md_minor;
338 info->array.ctime = sb->ctime;
339 info->array.utime = sb->utime;
340 info->array.chunk_size = sb->chunk_size;
341 info->array.state = sb->state;
342 info->component_size = sb->size*2;
343
344 info->disk.state = sb->this_disk.state;
345 info->disk.major = sb->this_disk.major;
346 info->disk.minor = sb->this_disk.minor;
347 info->disk.raid_disk = sb->this_disk.raid_disk;
348 info->disk.number = sb->this_disk.number;
349
350 info->events = md_event(sb);
351 info->data_offset = 0;
352
353 uuid_from_super0(st, info->uuid);
354
355 if (sb->minor_version > 90 && (sb->reshape_position+1) != 0) {
356 info->reshape_active = 1;
357 info->reshape_progress = sb->reshape_position;
358 info->new_level = sb->new_level;
359 info->delta_disks = sb->delta_disks;
360 info->new_layout = sb->new_layout;
361 info->new_chunk = sb->new_chunk;
362 } else
363 info->reshape_active = 0;
364
365 sprintf(info->name, "%d", sb->md_minor);
366 /* work_disks is calculated rather than read directly */
367 for (i=0; i < MD_SB_DISKS; i++)
368 if ((sb->disks[i].state & (1<<MD_DISK_SYNC)) &&
369 (sb->disks[i].raid_disk < info->array.raid_disks) &&
370 (sb->disks[i].state & (1<<MD_DISK_ACTIVE)) &&
371 !(sb->disks[i].state & (1<<MD_DISK_FAULTY)))
372 working ++;
373 info->array.working_disks = working;
374 }
375
376
377 static int update_super0(struct supertype *st, struct mdinfo *info,
378 char *update,
379 char *devname, int verbose,
380 int uuid_set, char *homehost)
381 {
382 /* NOTE: for 'assemble' and 'force' we need to return non-zero if any change was made.
383 * For others, the return value is ignored.
384 */
385 int rv = 0;
386 mdp_super_t *sb = st->sb;
387 if (strcmp(update, "sparc2.2")==0 ) {
388 /* 2.2 sparc put the events in the wrong place
389 * So we copy the tail of the superblock
390 * up 4 bytes before continuing
391 */
392 __u32 *sb32 = (__u32*)sb;
393 memcpy(sb32+MD_SB_GENERIC_CONSTANT_WORDS+7,
394 sb32+MD_SB_GENERIC_CONSTANT_WORDS+7+1,
395 (MD_SB_WORDS - (MD_SB_GENERIC_CONSTANT_WORDS+7+1))*4);
396 if (verbose >= 0)
397 fprintf (stderr, Name ": adjusting superblock of %s for 2.2/sparc compatability.\n",
398 devname);
399 }
400 if (strcmp(update, "super-minor") ==0) {
401 sb->md_minor = info->array.md_minor;
402 if (verbose > 0)
403 fprintf(stderr, Name ": updating superblock of %s with minor number %d\n",
404 devname, info->array.md_minor);
405 }
406 if (strcmp(update, "summaries") == 0) {
407 int i;
408 /* set nr_disks, active_disks, working_disks,
409 * failed_disks, spare_disks based on disks[]
410 * array in superblock.
411 * Also make sure extra slots aren't 'failed'
412 */
413 sb->nr_disks = sb->active_disks =
414 sb->working_disks = sb->failed_disks =
415 sb->spare_disks = 0;
416 for (i=0; i < MD_SB_DISKS ; i++)
417 if (sb->disks[i].major ||
418 sb->disks[i].minor) {
419 int state = sb->disks[i].state;
420 if (state & (1<<MD_DISK_REMOVED))
421 continue;
422 sb->nr_disks++;
423 if (state & (1<<MD_DISK_ACTIVE))
424 sb->active_disks++;
425 if (state & (1<<MD_DISK_FAULTY))
426 sb->failed_disks++;
427 else
428 sb->working_disks++;
429 if (state == 0)
430 sb->spare_disks++;
431 } else if (i >= sb->raid_disks && sb->disks[i].number == 0)
432 sb->disks[i].state = 0;
433 }
434 if (strcmp(update, "force-one")==0) {
435 /* Not enough devices for a working array, so
436 * bring this one up-to-date.
437 */
438 __u32 ehi = sb->events_hi, elo = sb->events_lo;
439 sb->events_hi = (info->events>>32) & 0xFFFFFFFF;
440 sb->events_lo = (info->events) & 0xFFFFFFFF;
441 if (sb->events_hi != ehi ||
442 sb->events_lo != elo)
443 rv = 1;
444 }
445 if (strcmp(update, "force-array")==0) {
446 /* degraded array and 'force' requested, so
447 * maybe need to mark it 'clean'
448 */
449 if ((sb->level == 5 || sb->level == 4 || sb->level == 6) &&
450 (sb->state & (1 << MD_SB_CLEAN)) == 0) {
451 /* need to force clean */
452 sb->state |= (1 << MD_SB_CLEAN);
453 rv = 1;
454 }
455 }
456 if (strcmp(update, "assemble")==0) {
457 int d = info->disk.number;
458 int wonly = sb->disks[d].state & (1<<MD_DISK_WRITEMOSTLY);
459 if ((sb->disks[d].state & ~(1<<MD_DISK_WRITEMOSTLY))
460 != info->disk.state) {
461 sb->disks[d].state = info->disk.state | wonly;
462 rv = 1;
463 }
464 }
465 if (strcmp(update, "linear-grow-new") == 0) {
466 memset(&sb->disks[info->disk.number], 0, sizeof(sb->disks[0]));
467 sb->disks[info->disk.number].number = info->disk.number;
468 sb->disks[info->disk.number].major = info->disk.major;
469 sb->disks[info->disk.number].minor = info->disk.minor;
470 sb->disks[info->disk.number].raid_disk = info->disk.raid_disk;
471 sb->disks[info->disk.number].state = info->disk.state;
472 sb->this_disk = sb->disks[info->disk.number];
473 }
474 if (strcmp(update, "linear-grow-update") == 0) {
475 sb->raid_disks = info->array.raid_disks;
476 sb->nr_disks = info->array.nr_disks;
477 sb->active_disks = info->array.active_disks;
478 sb->working_disks = info->array.working_disks;
479 memset(&sb->disks[info->disk.number], 0, sizeof(sb->disks[0]));
480 sb->disks[info->disk.number].number = info->disk.number;
481 sb->disks[info->disk.number].major = info->disk.major;
482 sb->disks[info->disk.number].minor = info->disk.minor;
483 sb->disks[info->disk.number].raid_disk = info->disk.raid_disk;
484 sb->disks[info->disk.number].state = info->disk.state;
485 }
486 if (strcmp(update, "resync") == 0) {
487 /* make sure resync happens */
488 sb->state &= ~(1<<MD_SB_CLEAN);
489 sb->recovery_cp = 0;
490 }
491 if (strcmp(update, "homehost") == 0 &&
492 homehost) {
493 uuid_set = 0;
494 update = "uuid";
495 info->uuid[0] = sb->set_uuid0;
496 info->uuid[1] = sb->set_uuid1;
497 }
498 if (strcmp(update, "uuid") == 0) {
499 if (!uuid_set && homehost) {
500 char buf[20];
501 char *hash = sha1_buffer(homehost,
502 strlen(homehost),
503 buf);
504 memcpy(info->uuid+2, hash, 8);
505 }
506 sb->set_uuid0 = info->uuid[0];
507 sb->set_uuid1 = info->uuid[1];
508 sb->set_uuid2 = info->uuid[2];
509 sb->set_uuid3 = info->uuid[3];
510 if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) {
511 struct bitmap_super_s *bm;
512 bm = (struct bitmap_super_s*)(sb+1);
513 uuid_from_super0(st, (int*)bm->uuid);
514 }
515 }
516 if (strcmp(update, "_reshape_progress")==0)
517 sb->reshape_position = info->reshape_progress;
518
519 sb->sb_csum = calc_sb0_csum(sb);
520 return rv;
521 }
522
523 /*
524 * For verion-0 superblock, the homehost is 'stored' in the
525 * uuid. 8 bytes for a hash of the host leaving 8 bytes
526 * of random material.
527 * We use the first 8 bytes (64bits) of the sha1 of the
528 * host name
529 */
530
531
532 static int init_super0(struct supertype *st, mdu_array_info_t *info,
533 unsigned long long size, char *ignored_name, char *homehost,
534 int *uuid)
535 {
536 mdp_super_t *sb = malloc(MD_SB_BYTES + sizeof(bitmap_super_t));
537 int spares;
538 memset(sb, 0, MD_SB_BYTES + sizeof(bitmap_super_t));
539
540 st->sb = sb;
541 if (info->major_version == -1) {
542 /* zeroing the superblock */
543 return 0;
544 }
545
546 spares = info->working_disks - info->active_disks;
547 if (info->raid_disks + spares > MD_SB_DISKS) {
548 fprintf(stderr, Name ": too many devices requested: %d+%d > %d\n",
549 info->raid_disks , spares, MD_SB_DISKS);
550 return 0;
551 }
552
553 sb->md_magic = MD_SB_MAGIC;
554 sb->major_version = 0;
555 sb->minor_version = 90;
556 sb->patch_version = 0;
557 sb->gvalid_words = 0; /* ignored */
558 sb->ctime = time(0);
559 sb->level = info->level;
560 if (size != info->size)
561 return 0;
562 sb->size = info->size;
563 sb->nr_disks = info->nr_disks;
564 sb->raid_disks = info->raid_disks;
565 sb->md_minor = info->md_minor;
566 sb->not_persistent = 0;
567 if (uuid) {
568 sb->set_uuid0 = uuid[0];
569 sb->set_uuid1 = uuid[1];
570 sb->set_uuid2 = uuid[2];
571 sb->set_uuid3 = uuid[3];
572 } else {
573 int rfd = open("/dev/urandom", O_RDONLY);
574 if (rfd < 0 || read(rfd, &sb->set_uuid0, 4) != 4)
575 sb->set_uuid0 = random();
576 if (rfd < 0 || read(rfd, &sb->set_uuid1, 12) != 12) {
577 sb->set_uuid1 = random();
578 sb->set_uuid2 = random();
579 sb->set_uuid3 = random();
580 }
581 if (rfd >= 0)
582 close(rfd);
583 }
584 if (homehost) {
585 char buf[20];
586 char *hash = sha1_buffer(homehost,
587 strlen(homehost),
588 buf);
589 memcpy(&sb->set_uuid2, hash, 8);
590 }
591
592 sb->utime = sb->ctime;
593 sb->state = info->state;
594 sb->active_disks = info->active_disks;
595 sb->working_disks = info->working_disks;
596 sb->failed_disks = info->failed_disks;
597 sb->spare_disks = info->spare_disks;
598 sb->events_hi = 0;
599 sb->events_lo = 1;
600
601 sb->layout = info->layout;
602 sb->chunk_size = info->chunk_size;
603
604 return 1;
605 }
606
607 /* Add a device to the superblock being created */
608 static void add_to_super0(struct supertype *st, mdu_disk_info_t *dinfo)
609 {
610 mdp_super_t *sb = st->sb;
611 mdp_disk_t *dk = &sb->disks[dinfo->number];
612
613 dk->number = dinfo->number;
614 dk->major = dinfo->major;
615 dk->minor = dinfo->minor;
616 dk->raid_disk = dinfo->raid_disk;
617 dk->state = dinfo->state;
618 }
619
620 static int store_super0(struct supertype *st, int fd)
621 {
622 unsigned long long dsize;
623 unsigned long long offset;
624 mdp_super_t *super = st->sb;
625
626 if (!get_dev_size(fd, NULL, &dsize))
627 return 1;
628
629 if (dsize < MD_RESERVED_SECTORS*512)
630 return 2;
631
632 offset = MD_NEW_SIZE_SECTORS(dsize>>9);
633
634 offset *= 512;
635
636 if (lseek64(fd, offset, 0)< 0LL)
637 return 3;
638
639 if (write(fd, super, sizeof(*super)) != sizeof(*super))
640 return 4;
641
642 if (super->state & (1<<MD_SB_BITMAP_PRESENT)) {
643 struct bitmap_super_s * bm = (struct bitmap_super_s*)(super+1);
644 if (__le32_to_cpu(bm->magic) == BITMAP_MAGIC)
645 if (write(fd, bm, sizeof(*bm)) != sizeof(*bm))
646 return 5;
647 }
648
649 fsync(fd);
650 return 0;
651 }
652
653 static int write_init_super0(struct supertype *st,
654 mdu_disk_info_t *dinfo, char *devname)
655 {
656 mdp_super_t *sb = st->sb;
657 int fd = open(devname, O_RDWR|O_EXCL);
658 int rv;
659
660 if (fd < 0) {
661 fprintf(stderr, Name ": Failed to open %s to write superblock\n", devname);
662 return -1;
663 }
664
665 sb->disks[dinfo->number].state &= ~(1<<MD_DISK_FAULTY);
666
667 sb->this_disk = sb->disks[dinfo->number];
668 sb->sb_csum = calc_sb0_csum(sb);
669 rv = store_super0(st, fd);
670
671 if (rv == 0 && (sb->state & (1<<MD_SB_BITMAP_PRESENT)))
672 rv = st->ss->write_bitmap(st, fd);
673
674 close(fd);
675 if (rv)
676 fprintf(stderr, Name ": failed to write superblock to %s\n", devname);
677 return rv;
678 }
679
680 static int compare_super0(struct supertype *st, struct supertype *tst)
681 {
682 /*
683 * return:
684 * 0 same, or first was empty, and second was copied
685 * 1 second had wrong number
686 * 2 wrong uuid
687 * 3 wrong other info
688 */
689 mdp_super_t *first = st->sb;
690 mdp_super_t *second = tst->sb;
691 int uuid1[4], uuid2[4];
692
693 if (second->md_magic != MD_SB_MAGIC)
694 return 1;
695 if (!first) {
696 first = malloc(MD_SB_BYTES + sizeof(struct bitmap_super_s));
697 memcpy(first, second, MD_SB_BYTES + sizeof(struct bitmap_super_s));
698 st->sb = first;
699 return 0;
700 }
701
702 uuid_from_super0(st, uuid1);
703 uuid_from_super0(tst, uuid2);
704 if (!same_uuid(uuid1, uuid2, 0))
705 return 2;
706 if (first->major_version != second->major_version ||
707 first->minor_version != second->minor_version ||
708 first->patch_version != second->patch_version ||
709 first->gvalid_words != second->gvalid_words ||
710 first->ctime != second->ctime ||
711 first->level != second->level ||
712 first->size != second->size ||
713 first->raid_disks != second->raid_disks )
714 return 3;
715
716 return 0;
717 }
718
719
720 static void free_super0(struct supertype *st);
721
722 static int load_super0(struct supertype *st, int fd, char *devname)
723 {
724 /* try to read in the superblock
725 * Return:
726 * 0 on success
727 * 1 on cannot get superblock
728 * 2 on superblock meaningless
729 */
730 unsigned long long dsize;
731 unsigned long long offset;
732 mdp_super_t *super;
733 int uuid[4];
734 struct bitmap_super_s *bsb;
735
736 free_super0(st);
737
738 if (!get_dev_size(fd, devname, &dsize))
739 return 1;
740
741 if (dsize < MD_RESERVED_SECTORS*512) {
742 if (devname)
743 fprintf(stderr, Name
744 ": %s is too small for md: size is %llu sectors.\n",
745 devname, dsize);
746 return 1;
747 }
748
749 offset = MD_NEW_SIZE_SECTORS(dsize>>9);
750
751 offset *= 512;
752
753 ioctl(fd, BLKFLSBUF, 0); /* make sure we read current data */
754
755 if (lseek64(fd, offset, 0)< 0LL) {
756 if (devname)
757 fprintf(stderr, Name ": Cannot seek to superblock on %s: %s\n",
758 devname, strerror(errno));
759 return 1;
760 }
761
762 super = malloc(MD_SB_BYTES + sizeof(bitmap_super_t));
763
764 if (read(fd, super, sizeof(*super)) != MD_SB_BYTES) {
765 if (devname)
766 fprintf(stderr, Name ": Cannot read superblock on %s\n",
767 devname);
768 free(super);
769 return 1;
770 }
771
772 if (st->ss && st->minor_version == 9)
773 super0_swap_endian(super);
774
775 if (super->md_magic != MD_SB_MAGIC) {
776 if (devname)
777 fprintf(stderr, Name ": No super block found on %s (Expected magic %08x, got %08x)\n",
778 devname, MD_SB_MAGIC, super->md_magic);
779 free(super);
780 return 2;
781 }
782
783 if (super->major_version != 0) {
784 if (devname)
785 fprintf(stderr, Name ": Cannot interpret superblock on %s - version is %d\n",
786 devname, super->major_version);
787 free(super);
788 return 2;
789 }
790 st->sb = super;
791
792 if (st->ss == NULL) {
793 st->ss = &super0;
794 st->minor_version = 90;
795 st->max_devs = MD_SB_DISKS;
796 }
797
798 /* Now check on the bitmap superblock */
799 if ((super->state & (1<<MD_SB_BITMAP_PRESENT)) == 0)
800 return 0;
801 /* Read the bitmap superblock and make sure it looks
802 * valid. If it doesn't clear the bit. An --assemble --force
803 * should get that written out.
804 */
805 if (read(fd, super+1, sizeof(struct bitmap_super_s))
806 != sizeof(struct bitmap_super_s))
807 goto no_bitmap;
808
809 uuid_from_super0(st, uuid);
810 bsb = (struct bitmap_super_s *)(super+1);
811 if (__le32_to_cpu(bsb->magic) != BITMAP_MAGIC ||
812 memcmp(bsb->uuid, uuid, 16) != 0)
813 goto no_bitmap;
814 return 0;
815
816 no_bitmap:
817 super->state &= ~(1<<MD_SB_BITMAP_PRESENT);
818
819 return 0;
820 }
821
822 static struct supertype *match_metadata_desc0(char *arg)
823 {
824 struct supertype *st = malloc(sizeof(*st));
825 if (!st) return st;
826
827 st->ss = &super0;
828 st->minor_version = 90;
829 st->max_devs = MD_SB_DISKS;
830 st->sb = NULL;
831 if (strcmp(arg, "0") == 0 ||
832 strcmp(arg, "0.90") == 0 ||
833 strcmp(arg, "default") == 0
834 )
835 return st;
836
837 st->minor_version = 9; /* flag for 'byte-swapped' */
838 if (strcmp(arg, "0.swap")==0)
839 return st;
840
841 free(st);
842 return NULL;
843 }
844
845 static __u64 avail_size0(struct supertype *st, __u64 devsize)
846 {
847 if (devsize < MD_RESERVED_SECTORS)
848 return 0ULL;
849 return MD_NEW_SIZE_SECTORS(devsize);
850 }
851
852 static int add_internal_bitmap0(struct supertype *st, int *chunkp,
853 int delay, int write_behind,
854 unsigned long long size, int may_change,
855 int major)
856 {
857 /*
858 * The bitmap comes immediately after the superblock and must be 60K in size
859 * at most. The default size is between 30K and 60K
860 *
861 * size is in sectors, chunk is in bytes !!!
862 */
863 unsigned long long bits;
864 unsigned long long max_bits = 60*1024*8;
865 unsigned long long min_chunk;
866 int chunk = *chunkp;
867 mdp_super_t *sb = st->sb;
868 bitmap_super_t *bms = (bitmap_super_t*)(((char*)sb) + MD_SB_BYTES);
869
870
871 min_chunk = 4096; /* sub-page chunks don't work yet.. */
872 bits = (size * 512) / min_chunk + 1;
873 while (bits > max_bits) {
874 min_chunk *= 2;
875 bits = (bits+1)/2;
876 }
877 if (chunk == UnSet)
878 chunk = min_chunk;
879 else if (chunk < min_chunk)
880 return 0; /* chunk size too small */
881
882 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
883
884 memset(bms, 0, sizeof(*bms));
885 bms->magic = __cpu_to_le32(BITMAP_MAGIC);
886 bms->version = __cpu_to_le32(major);
887 uuid_from_super0(st, (int*)bms->uuid);
888 bms->chunksize = __cpu_to_le32(chunk);
889 bms->daemon_sleep = __cpu_to_le32(delay);
890 bms->sync_size = __cpu_to_le64(size);
891 bms->write_behind = __cpu_to_le32(write_behind);
892 *chunkp = chunk;
893 return 1;
894 }
895
896
897 void locate_bitmap0(struct supertype *st, int fd)
898 {
899 unsigned long long dsize;
900 unsigned long long offset;
901
902 if (!get_dev_size(fd, NULL, &dsize))
903 return;
904
905 if (dsize < MD_RESERVED_SECTORS*512)
906 return;
907
908 offset = MD_NEW_SIZE_SECTORS(dsize>>9);
909
910 offset *= 512;
911
912 offset += MD_SB_BYTES;
913
914 lseek64(fd, offset, 0);
915 }
916
917 int write_bitmap0(struct supertype *st, int fd)
918 {
919 unsigned long long dsize;
920 unsigned long long offset;
921 mdp_super_t *sb = st->sb;
922
923 int rv = 0;
924
925 int towrite, n;
926 char buf[4096];
927
928 if (!get_dev_size(fd, NULL, &dsize))
929 return 1;
930
931
932 if (dsize < MD_RESERVED_SECTORS*512)
933 return -1;
934
935 offset = MD_NEW_SIZE_SECTORS(dsize>>9);
936
937 offset *= 512;
938
939 if (lseek64(fd, offset + 4096, 0)< 0LL)
940 return 3;
941
942
943 if (write(fd, ((char*)sb)+MD_SB_BYTES, sizeof(bitmap_super_t)) !=
944 sizeof(bitmap_super_t))
945 return -2;
946 towrite = 64*1024 - MD_SB_BYTES - sizeof(bitmap_super_t);
947 memset(buf, 0xff, sizeof(buf));
948 while (towrite > 0) {
949 n = towrite;
950 if (n > sizeof(buf))
951 n = sizeof(buf);
952 n = write(fd, buf, n);
953 if (n > 0)
954 towrite -= n;
955 else
956 break;
957 }
958 fsync(fd);
959 if (towrite)
960 rv = -2;
961
962 return rv;
963 }
964
965 static void free_super0(struct supertype *st)
966 {
967 if (st->sb)
968 free(st->sb);
969 st->sb = NULL;
970 }
971
972 struct superswitch super0 = {
973 #ifndef MDASSEMBLE
974 .examine_super = examine_super0,
975 .brief_examine_super = brief_examine_super0,
976 .detail_super = detail_super0,
977 .brief_detail_super = brief_detail_super0,
978 .export_super = export_super0,
979 #endif
980 .match_home = match_home0,
981 .uuid_from_super = uuid_from_super0,
982 .getinfo_super = getinfo_super0,
983 .update_super = update_super0,
984 .init_super = init_super0,
985 .add_to_super = add_to_super0,
986 .store_super = store_super0,
987 .write_init_super = write_init_super0,
988 .compare_super = compare_super0,
989 .load_super = load_super0,
990 .match_metadata_desc = match_metadata_desc0,
991 .avail_size = avail_size0,
992 .add_internal_bitmap = add_internal_bitmap0,
993 .locate_bitmap = locate_bitmap0,
994 .write_bitmap = write_bitmap0,
995 .free_super = free_super0,
996 .major = 0,
997 .swapuuid = 0,
998 };
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