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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(void *sbv, char *homehost)
89 {
90 mdp_super_t *sb = sbv;
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 atime = sb->ctime;
114 printf(" Creation Time : %.24s\n", ctime(&atime));
115 c=map_num(pers, sb->level);
116 printf(" Raid Level : %s\n", c?c:"-unknown-");
117 if ((int)sb->level >= 0) {
118 int ddsks=0;
119 printf(" Device Size : %d%s\n", sb->size, human_size((long long)sb->size<<10));
120 switch(sb->level) {
121 case 1: ddsks=1;break;
122 case 4:
123 case 5: ddsks = sb->raid_disks-1; break;
124 case 6: ddsks = sb->raid_disks-2; break;
125 case 10: ddsks = sb->raid_disks / (sb->layout&255) / ((sb->layout>>8)&255);
126 }
127 if (ddsks)
128 printf(" Array Size : %llu%s\n", (unsigned long long)ddsks * sb->size,
129 human_size(ddsks*(long long)sb->size<<10));
130 }
131 printf(" Raid Devices : %d\n", sb->raid_disks);
132 printf(" Total Devices : %d\n", sb->nr_disks);
133 printf("Preferred Minor : %d\n", sb->md_minor);
134 printf("\n");
135 if (sb->minor_version > 90 && (sb->reshape_position+1) != 0) {
136 printf(" Reshape pos'n : %llu%s\n", (unsigned long long)sb->reshape_position/2, human_size((long long)sb->reshape_position<<9));
137 if (sb->delta_disks) {
138 printf(" Delta Devices : %d", sb->delta_disks);
139 if (sb->delta_disks)
140 printf(" (%d->%d)\n", sb->raid_disks-sb->delta_disks, sb->raid_disks);
141 else
142 printf(" (%d->%d)\n", sb->raid_disks, sb->raid_disks+sb->delta_disks);
143 }
144 if (sb->new_level != sb->level) {
145 c = map_num(pers, sb->new_level);
146 printf(" New Level : %s\n", c?c:"-unknown-");
147 }
148 if (sb->new_layout != sb->layout) {
149 if (sb->level == 5) {
150 c = map_num(r5layout, sb->new_layout);
151 printf(" New Layout : %s\n", c?c:"-unknown-");
152 }
153 if (sb->level == 10) {
154 printf(" New Layout : near=%d, %s=%d\n",
155 sb->new_layout&255,
156 (sb->new_layout&0x10000)?"offset":"far",
157 (sb->new_layout>>8)&255);
158 }
159 }
160 if (sb->new_chunk != sb->chunk_size)
161 printf(" New Chunksize : %d\n", sb->new_chunk);
162 printf("\n");
163 }
164 atime = sb->utime;
165 printf(" Update Time : %.24s\n", ctime(&atime));
166 printf(" State : %s\n",
167 (sb->state&(1<<MD_SB_CLEAN))?"clean":"active");
168 if (sb->state & (1<<MD_SB_BITMAP_PRESENT))
169 printf("Internal Bitmap : present\n");
170 printf(" Active Devices : %d\n", sb->active_disks);
171 printf("Working Devices : %d\n", sb->working_disks);
172 printf(" Failed Devices : %d\n", sb->failed_disks);
173 printf(" Spare Devices : %d\n", sb->spare_disks);
174 if (calc_sb0_csum(sb) == sb->sb_csum)
175 printf(" Checksum : %x - correct\n", sb->sb_csum);
176 else
177 printf(" Checksum : %x - expected %lx\n", sb->sb_csum, calc_sb0_csum(sb));
178 printf(" Events : %d.%d\n", sb->events_hi, sb->events_lo);
179 printf("\n");
180 if (sb->level == 5) {
181 c = map_num(r5layout, sb->layout);
182 printf(" Layout : %s\n", c?c:"-unknown-");
183 }
184 if (sb->level == 10) {
185 printf(" Layout : near=%d, %s=%d\n",
186 sb->layout&255,
187 (sb->layout&0x10000)?"offset":"far",
188 (sb->layout>>8)&255);
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(void *sbv)
231 {
232 mdp_super_t *sb = sbv;
233 char *c=map_num(pers, sb->level);
234 char devname[20];
235
236 sprintf(devname, "/dev/md%d", sb->md_minor);
237
238 printf("ARRAY %s level=%s num-devices=%d UUID=",
239 devname,
240 c?c:"-unknown-", sb->raid_disks);
241 if (sb->minor_version >= 90)
242 printf("%08x:%08x:%08x:%08x", sb->set_uuid0, sb->set_uuid1,
243 sb->set_uuid2, sb->set_uuid3);
244 else
245 printf("%08x", sb->set_uuid0);
246 printf("\n");
247 }
248
249 static void detail_super0(void *sbv, char *homehost)
250 {
251 mdp_super_t *sb = sbv;
252 printf(" UUID : ");
253 if (sb->minor_version >= 90)
254 printf("%08x:%08x:%08x:%08x", sb->set_uuid0, sb->set_uuid1,
255 sb->set_uuid2, sb->set_uuid3);
256 else
257 printf("%08x", sb->set_uuid0);
258 if (homehost) {
259 char buf[20];
260 void *hash = sha1_buffer(homehost,
261 strlen(homehost),
262 buf);
263 if (memcmp(&sb->set_uuid2, hash, 8)==0)
264 printf(" (local to host %s)", homehost);
265 }
266 printf("\n Events : %d.%d\n\n", sb->events_hi, sb->events_lo);
267 }
268
269 static void brief_detail_super0(void *sbv)
270 {
271 mdp_super_t *sb = sbv;
272 printf(" UUID=");
273 if (sb->minor_version >= 90)
274 printf("%08x:%08x:%08x:%08x", sb->set_uuid0, sb->set_uuid1,
275 sb->set_uuid2, sb->set_uuid3);
276 else
277 printf("%08x", sb->set_uuid0);
278 }
279 #endif
280
281 static int match_home0(void *sbv, char *homehost)
282 {
283 mdp_super_t *sb = sbv;
284 char buf[20];
285 char *hash = sha1_buffer(homehost,
286 strlen(homehost),
287 buf);
288
289 return (memcmp(&sb->set_uuid2, hash, 8)==0);
290 }
291
292 static void uuid_from_super0(int uuid[4], void * sbv)
293 {
294 mdp_super_t *super = sbv;
295 uuid[0] = super->set_uuid0;
296 if (super->minor_version >= 90) {
297 uuid[1] = super->set_uuid1;
298 uuid[2] = super->set_uuid2;
299 uuid[3] = super->set_uuid3;
300 } else {
301 uuid[1] = 0;
302 uuid[2] = 0;
303 uuid[3] = 0;
304 }
305 }
306
307 static void getinfo_super0(struct mdinfo *info, void *sbv)
308 {
309 mdp_super_t *sb = sbv;
310 int working = 0;
311 int i;
312
313 info->array.major_version = sb->major_version;
314 info->array.minor_version = sb->minor_version;
315 info->array.patch_version = sb->patch_version;
316 info->array.raid_disks = sb->raid_disks;
317 info->array.level = sb->level;
318 info->array.layout = sb->layout;
319 info->array.md_minor = sb->md_minor;
320 info->array.ctime = sb->ctime;
321 info->array.utime = sb->utime;
322 info->array.chunk_size = sb->chunk_size;
323 info->component_size = sb->size*2;
324
325 info->disk.state = sb->this_disk.state;
326 info->disk.major = sb->this_disk.major;
327 info->disk.minor = sb->this_disk.minor;
328 info->disk.raid_disk = sb->this_disk.raid_disk;
329 info->disk.number = sb->this_disk.number;
330
331 info->events = md_event(sb);
332 info->data_offset = 0;
333
334 uuid_from_super0(info->uuid, sbv);
335
336 if (sb->minor_version > 90 && (sb->reshape_position+1) != 0) {
337 info->reshape_active = 1;
338 info->reshape_progress = sb->reshape_position;
339 info->new_level = sb->new_level;
340 info->delta_disks = sb->delta_disks;
341 info->new_layout = sb->new_layout;
342 info->new_chunk = sb->new_chunk;
343 } else
344 info->reshape_active = 0;
345
346 sprintf(info->name, "%d", sb->md_minor);
347 /* work_disks is calculated rather than read directly */
348 for (i=0; i < MD_SB_DISKS; i++)
349 if ((sb->disks[i].state & (1<<MD_DISK_SYNC)) &&
350 (sb->disks[i].raid_disk < info->array.raid_disks) &&
351 (sb->disks[i].state & (1<<MD_DISK_ACTIVE)) &&
352 !(sb->disks[i].state & (1<<MD_DISK_FAULTY)))
353 working ++;
354 info->array.working_disks = working;
355 }
356
357
358 static int update_super0(struct mdinfo *info, void *sbv, char *update,
359 char *devname, int verbose,
360 int uuid_set, char *homehost)
361 {
362 /* NOTE: for 'assemble' and 'force' we need to return non-zero if any change was made.
363 * For others, the return value is ignored.
364 */
365 int rv = 0;
366 mdp_super_t *sb = sbv;
367 if (strcmp(update, "sparc2.2")==0 ) {
368 /* 2.2 sparc put the events in the wrong place
369 * So we copy the tail of the superblock
370 * up 4 bytes before continuing
371 */
372 __u32 *sb32 = (__u32*)sb;
373 memcpy(sb32+MD_SB_GENERIC_CONSTANT_WORDS+7,
374 sb32+MD_SB_GENERIC_CONSTANT_WORDS+7+1,
375 (MD_SB_WORDS - (MD_SB_GENERIC_CONSTANT_WORDS+7+1))*4);
376 if (verbose >= 0)
377 fprintf (stderr, Name ": adjusting superblock of %s for 2.2/sparc compatability.\n",
378 devname);
379 }
380 if (strcmp(update, "super-minor") ==0) {
381 sb->md_minor = info->array.md_minor;
382 if (verbose > 0)
383 fprintf(stderr, Name ": updating superblock of %s with minor number %d\n",
384 devname, info->array.md_minor);
385 }
386 if (strcmp(update, "summaries") == 0) {
387 int i;
388 /* set nr_disks, active_disks, working_disks,
389 * failed_disks, spare_disks based on disks[]
390 * array in superblock.
391 * Also make sure extra slots aren't 'failed'
392 */
393 sb->nr_disks = sb->active_disks =
394 sb->working_disks = sb->failed_disks =
395 sb->spare_disks = 0;
396 for (i=0; i < MD_SB_DISKS ; i++)
397 if (sb->disks[i].major ||
398 sb->disks[i].minor) {
399 int state = sb->disks[i].state;
400 if (state & (1<<MD_DISK_REMOVED))
401 continue;
402 sb->nr_disks++;
403 if (state & (1<<MD_DISK_ACTIVE))
404 sb->active_disks++;
405 if (state & (1<<MD_DISK_FAULTY))
406 sb->failed_disks++;
407 else
408 sb->working_disks++;
409 if (state == 0)
410 sb->spare_disks++;
411 } else if (i >= sb->raid_disks && sb->disks[i].number == 0)
412 sb->disks[i].state = 0;
413 }
414 if (strcmp(update, "force-one")==0) {
415 /* Not enough devices for a working array, so
416 * bring this one up-to-date.
417 */
418 __u32 ehi = sb->events_hi, elo = sb->events_lo;
419 sb->events_hi = (info->events>>32) & 0xFFFFFFFF;
420 sb->events_lo = (info->events) & 0xFFFFFFFF;
421 if (sb->events_hi != ehi ||
422 sb->events_lo != elo)
423 rv = 1;
424 }
425 if (strcmp(update, "force-array")==0) {
426 /* degraded array and 'force' requested, so
427 * maybe need to mark it 'clean'
428 */
429 if ((sb->level == 5 || sb->level == 4 || sb->level == 6) &&
430 (sb->state & (1 << MD_SB_CLEAN)) == 0) {
431 /* need to force clean */
432 sb->state |= (1 << MD_SB_CLEAN);
433 rv = 1;
434 }
435 }
436 if (strcmp(update, "assemble")==0) {
437 int d = info->disk.number;
438 int wonly = sb->disks[d].state & (1<<MD_DISK_WRITEMOSTLY);
439 if ((sb->disks[d].state & ~(1<<MD_DISK_WRITEMOSTLY))
440 != info->disk.state) {
441 sb->disks[d].state = info->disk.state | wonly;
442 rv = 1;
443 }
444 }
445 if (strcmp(update, "newdev") == 0) {
446 int d = info->disk.number;
447 memset(&sb->disks[d], 0, sizeof(sb->disks[d]));
448 sb->disks[d].number = d;
449 sb->disks[d].major = info->disk.major;
450 sb->disks[d].minor = info->disk.minor;
451 sb->disks[d].raid_disk = info->disk.raid_disk;
452 sb->disks[d].state = info->disk.state;
453 sb->this_disk = sb->disks[d];
454 }
455 if (strcmp(update, "grow") == 0) {
456 sb->raid_disks = info->array.raid_disks;
457 sb->nr_disks = info->array.nr_disks;
458 sb->active_disks = info->array.active_disks;
459 sb->working_disks = info->array.working_disks;
460 memset(&sb->disks[info->disk.number], 0, sizeof(sb->disks[0]));
461 sb->disks[info->disk.number].number = info->disk.number;
462 sb->disks[info->disk.number].major = info->disk.major;
463 sb->disks[info->disk.number].minor = info->disk.minor;
464 sb->disks[info->disk.number].raid_disk = info->disk.raid_disk;
465 sb->disks[info->disk.number].state = info->disk.state;
466 if (sb->this_disk.number == info->disk.number)
467 sb->this_disk = sb->disks[info->disk.number];
468 }
469 if (strcmp(update, "resync") == 0) {
470 /* make sure resync happens */
471 sb->state &= ~(1<<MD_SB_CLEAN);
472 sb->recovery_cp = 0;
473 }
474 if (strcmp(update, "homehost") == 0 &&
475 homehost) {
476 uuid_set = 0;
477 update = "uuid";
478 info->uuid[0] = sb->set_uuid0;
479 info->uuid[1] = sb->set_uuid1;
480 }
481 if (strcmp(update, "uuid") == 0) {
482 if (!uuid_set && homehost) {
483 char buf[20];
484 char *hash = sha1_buffer(homehost,
485 strlen(homehost),
486 buf);
487 memcpy(info->uuid+2, hash, 8);
488 }
489 sb->set_uuid0 = info->uuid[0];
490 sb->set_uuid1 = info->uuid[1];
491 sb->set_uuid2 = info->uuid[2];
492 sb->set_uuid3 = info->uuid[3];
493 if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) {
494 struct bitmap_super_s *bm;
495 bm = (struct bitmap_super_s*)(sb+1);
496 uuid_from_super0((int*)bm->uuid, sbv);
497 }
498 }
499 if (strcmp(update, "_reshape_progress")==0)
500 sb->reshape_position = info->reshape_progress;
501
502 sb->sb_csum = calc_sb0_csum(sb);
503 return rv;
504 }
505
506 static __u64 event_super0(void *sbv)
507 {
508 mdp_super_t *sb = sbv;
509 return md_event(sb);
510 }
511
512 /*
513 * For verion-0 superblock, the homehost is 'stored' in the
514 * uuid. 8 bytes for a hash of the host leaving 8 bytes
515 * of random material.
516 * We use the first 8 bytes (64bits) of the sha1 of the
517 * host name
518 */
519
520
521 static int init_super0(struct supertype *st, void **sbp, mdu_array_info_t *info,
522 unsigned long long size, char *ignored_name, char *homehost)
523 {
524 mdp_super_t *sb = malloc(MD_SB_BYTES + sizeof(bitmap_super_t));
525 int spares;
526 int rfd;
527 memset(sb, 0, MD_SB_BYTES + sizeof(bitmap_super_t));
528
529 if (info->major_version == -1) {
530 /* zeroing the superblock */
531 *sbp = sb;
532 return 0;
533 }
534
535 spares = info->working_disks - info->active_disks;
536 if (info->raid_disks + spares > MD_SB_DISKS) {
537 fprintf(stderr, Name ": too many devices requested: %d+%d > %d\n",
538 info->raid_disks , spares, MD_SB_DISKS);
539 return 0;
540 }
541
542 rfd = open("/dev/urandom", O_RDONLY);
543 sb->md_magic = MD_SB_MAGIC;
544 sb->major_version = 0;
545 sb->minor_version = 90;
546 sb->patch_version = 0;
547 sb->gvalid_words = 0; /* ignored */
548 if (rfd < 0 || read(rfd, &sb->set_uuid0, 4) != 4)
549 sb->set_uuid0 = random();
550 sb->ctime = time(0);
551 sb->level = info->level;
552 if (size != info->size)
553 return 0;
554 sb->size = info->size;
555 sb->nr_disks = info->nr_disks;
556 sb->raid_disks = info->raid_disks;
557 sb->md_minor = info->md_minor;
558 sb->not_persistent = 0;
559 if (rfd < 0 || read(rfd, &sb->set_uuid1, 12) != 12) {
560 sb->set_uuid1 = random();
561 sb->set_uuid2 = random();
562 sb->set_uuid3 = random();
563 }
564 if (rfd >= 0)
565 close(rfd);
566 if (homehost) {
567 char buf[20];
568 char *hash = sha1_buffer(homehost,
569 strlen(homehost),
570 buf);
571 memcpy(&sb->set_uuid2, hash, 8);
572 }
573
574 sb->utime = sb->ctime;
575 sb->state = info->state;
576 sb->active_disks = info->active_disks;
577 sb->working_disks = info->working_disks;
578 sb->failed_disks = info->failed_disks;
579 sb->spare_disks = info->spare_disks;
580 sb->events_hi = 0;
581 sb->events_lo = 1;
582
583 sb->layout = info->layout;
584 sb->chunk_size = info->chunk_size;
585
586 *sbp = sb;
587 return 1;
588 }
589
590 /* Add a device to the superblock being created */
591 static void add_to_super0(void *sbv, mdu_disk_info_t *dinfo)
592 {
593 mdp_super_t *sb = sbv;
594 mdp_disk_t *dk = &sb->disks[dinfo->number];
595
596 dk->number = dinfo->number;
597 dk->major = dinfo->major;
598 dk->minor = dinfo->minor;
599 dk->raid_disk = dinfo->raid_disk;
600 dk->state = dinfo->state;
601 }
602
603 static int store_super0(struct supertype *st, int fd, void *sbv)
604 {
605 unsigned long size;
606 unsigned long long dsize;
607 unsigned long long offset;
608 mdp_super_t *super = sbv;
609
610 #ifdef BLKGETSIZE64
611 if (ioctl(fd, BLKGETSIZE64, &dsize) != 0)
612 #endif
613 {
614 if (ioctl(fd, BLKGETSIZE, &size))
615 return 1;
616 else
617 dsize = ((unsigned long long)size)<<9;
618 }
619
620 if (dsize < MD_RESERVED_SECTORS*2*512)
621 return 2;
622
623 offset = MD_NEW_SIZE_SECTORS(dsize>>9);
624
625 offset *= 512;
626
627 if (lseek64(fd, offset, 0)< 0LL)
628 return 3;
629
630 if (write(fd, super, sizeof(*super)) != sizeof(*super))
631 return 4;
632
633 if (super->state & (1<<MD_SB_BITMAP_PRESENT)) {
634 struct bitmap_super_s * bm = (struct bitmap_super_s*)(super+1);
635 if (__le32_to_cpu(bm->magic) == BITMAP_MAGIC)
636 if (write(fd, bm, sizeof(*bm)) != sizeof(*bm))
637 return 5;
638 }
639
640 fsync(fd);
641 return 0;
642 }
643
644 static int write_init_super0(struct supertype *st, void *sbv, mdu_disk_info_t *dinfo, char *devname)
645 {
646 mdp_super_t *sb = sbv;
647 int fd = open(devname, O_RDWR|O_EXCL);
648 int rv;
649
650 if (fd < 0) {
651 fprintf(stderr, Name ": Failed to open %s to write superblock\n", devname);
652 return -1;
653 }
654
655 sb->disks[dinfo->number].state &= ~(1<<MD_DISK_FAULTY);
656
657 sb->this_disk = sb->disks[dinfo->number];
658 sb->sb_csum = calc_sb0_csum(sb);
659 rv = store_super0(st, fd, sb);
660
661 if (rv == 0 && (sb->state & (1<<MD_SB_BITMAP_PRESENT)))
662 rv = st->ss->write_bitmap(st, fd, sbv);
663
664 close(fd);
665 if (rv)
666 fprintf(stderr, Name ": failed to write superblock to %s\n", devname);
667 return rv;
668 }
669
670 static int compare_super0(void **firstp, void *secondv)
671 {
672 /*
673 * return:
674 * 0 same, or first was empty, and second was copied
675 * 1 second had wrong number
676 * 2 wrong uuid
677 * 3 wrong other info
678 */
679 mdp_super_t *first = *firstp;
680 mdp_super_t *second = secondv;
681
682 int uuid1[4], uuid2[4];
683 if (second->md_magic != MD_SB_MAGIC)
684 return 1;
685 if (!first) {
686 first = malloc(MD_SB_BYTES + sizeof(struct bitmap_super_s));
687 memcpy(first, second, MD_SB_BYTES + sizeof(struct bitmap_super_s));
688 *firstp = first;
689 return 0;
690 }
691
692 uuid_from_super0(uuid1, first);
693 uuid_from_super0(uuid2, second);
694 if (!same_uuid(uuid1, uuid2, 0))
695 return 2;
696 if (first->major_version != second->major_version ||
697 first->minor_version != second->minor_version ||
698 first->patch_version != second->patch_version ||
699 first->gvalid_words != second->gvalid_words ||
700 first->ctime != second->ctime ||
701 first->level != second->level ||
702 first->size != second->size ||
703 first->raid_disks != second->raid_disks )
704 return 3;
705
706 return 0;
707 }
708
709
710 static int load_super0(struct supertype *st, int fd, void **sbp, char *devname)
711 {
712 /* try to read in the superblock
713 * Return:
714 * 0 on success
715 * 1 on cannot get superblock
716 * 2 on superblock meaningless
717 */
718 unsigned long size;
719 unsigned long long dsize;
720 unsigned long long offset;
721 mdp_super_t *super;
722 int uuid[4];
723 struct bitmap_super_s *bsb;
724
725 #ifdef BLKGETSIZE64
726 if (ioctl(fd, BLKGETSIZE64, &dsize) != 0)
727 #endif
728 {
729 if (ioctl(fd, BLKGETSIZE, &size)) {
730 if (devname)
731 fprintf(stderr, Name ": cannot find device size for %s: %s\n",
732 devname, strerror(errno));
733 return 1;
734 } else
735 dsize = size << 9;
736 }
737
738 if (dsize < MD_RESERVED_SECTORS*2) {
739 if (devname)
740 fprintf(stderr, Name ": %s is too small for md: size is %ld sectors.\n",
741 devname, size);
742 return 1;
743 }
744
745 offset = MD_NEW_SIZE_SECTORS(dsize>>9);
746
747 offset *= 512;
748
749 ioctl(fd, BLKFLSBUF, 0); /* make sure we read current data */
750
751 if (lseek64(fd, offset, 0)< 0LL) {
752 if (devname)
753 fprintf(stderr, Name ": Cannot seek to superblock on %s: %s\n",
754 devname, strerror(errno));
755 return 1;
756 }
757
758 super = malloc(MD_SB_BYTES + sizeof(bitmap_super_t));
759
760 if (read(fd, super, sizeof(*super)) != MD_SB_BYTES) {
761 if (devname)
762 fprintf(stderr, Name ": Cannot read superblock on %s\n",
763 devname);
764 free(super);
765 return 1;
766 }
767
768 if (st->ss && st->minor_version == 9)
769 super0_swap_endian(super);
770
771 if (super->md_magic != MD_SB_MAGIC) {
772 if (devname)
773 fprintf(stderr, Name ": No super block found on %s (Expected magic %08x, got %08x)\n",
774 devname, MD_SB_MAGIC, super->md_magic);
775 free(super);
776 return 2;
777 }
778
779 if (super->major_version != 0) {
780 if (devname)
781 fprintf(stderr, Name ": Cannot interpret superblock on %s - version is %d\n",
782 devname, super->major_version);
783 free(super);
784 return 2;
785 }
786 *sbp = super;
787 if (st->ss == NULL) {
788 st->ss = &super0;
789 st->minor_version = 90;
790 st->max_devs = MD_SB_DISKS;
791 }
792
793 /* Now check on the bitmap superblock */
794 if ((super->state & (1<<MD_SB_BITMAP_PRESENT)) == 0)
795 return 0;
796 /* Read the bitmap superblock and make sure it looks
797 * valid. If it doesn't clear the bit. An --assemble --force
798 * should get that written out.
799 */
800 if (read(fd, super+1, sizeof(struct bitmap_super_s))
801 != sizeof(struct bitmap_super_s))
802 goto no_bitmap;
803
804 uuid_from_super0(uuid, super);
805 bsb = (struct bitmap_super_s *)(super+1);
806 if (__le32_to_cpu(bsb->magic) != BITMAP_MAGIC ||
807 memcmp(bsb->uuid, uuid, 16) != 0)
808 goto no_bitmap;
809 return 0;
810
811 no_bitmap:
812 super->state &= ~(1<<MD_SB_BITMAP_PRESENT);
813
814 return 0;
815 }
816
817 static struct supertype *match_metadata_desc0(char *arg)
818 {
819 struct supertype *st = malloc(sizeof(*st));
820 if (!st) return st;
821
822 st->ss = &super0;
823 st->minor_version = 90;
824 st->max_devs = MD_SB_DISKS;
825 if (strcmp(arg, "0") == 0 ||
826 strcmp(arg, "0.90") == 0 ||
827 strcmp(arg, "default") == 0
828 )
829 return st;
830
831 st->minor_version = 9; /* flag for 'byte-swapped' */
832 if (strcmp(arg, "0.swap")==0)
833 return st;
834
835 free(st);
836 return NULL;
837 }
838
839 static __u64 avail_size0(struct supertype *st, __u64 devsize)
840 {
841 if (devsize < MD_RESERVED_SECTORS*2)
842 return 0ULL;
843 return MD_NEW_SIZE_SECTORS(devsize);
844 }
845
846 static int add_internal_bitmap0(struct supertype *st, void *sbv, int chunk, int delay, int write_behind, unsigned long long size, int may_change, int major)
847 {
848 /*
849 * The bitmap comes immediately after the superblock and must be 60K in size
850 * at most. The default size is between 30K and 60K
851 *
852 * size is in sectors, chunk is in bytes !!!
853 */
854 unsigned long long bits;
855 unsigned long long max_bits = 60*1024*8;
856 unsigned long long min_chunk;
857 mdp_super_t *sb = sbv;
858 bitmap_super_t *bms = (bitmap_super_t*)(((char*)sb) + MD_SB_BYTES);
859
860
861 min_chunk = 4096; /* sub-page chunks don't work yet.. */
862 bits = (size * 512) / min_chunk + 1;
863 while (bits > max_bits) {
864 min_chunk *= 2;
865 bits = (bits+1)/2;
866 }
867 if (chunk == UnSet)
868 chunk = min_chunk;
869 else if (chunk < min_chunk)
870 return 0; /* chunk size too small */
871
872 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
873
874 memset(bms, 0, sizeof(*bms));
875 bms->magic = __cpu_to_le32(BITMAP_MAGIC);
876 bms->version = __cpu_to_le32(major);
877 uuid_from_super0((int*)bms->uuid, sb);
878 bms->chunksize = __cpu_to_le32(chunk);
879 bms->daemon_sleep = __cpu_to_le32(delay);
880 bms->sync_size = __cpu_to_le64(size);
881 bms->write_behind = __cpu_to_le32(write_behind);
882
883 return 1;
884 }
885
886
887 void locate_bitmap0(struct supertype *st, int fd, void *sbv)
888 {
889 unsigned long long dsize;
890 unsigned long size;
891 unsigned long long offset;
892 #ifdef BLKGETSIZE64
893 if (ioctl(fd, BLKGETSIZE64, &dsize) != 0)
894 #endif
895 {
896 if (ioctl(fd, BLKGETSIZE, &size))
897 return;
898 else
899 dsize = ((unsigned long long)size)<<9;
900 }
901
902 if (dsize < MD_RESERVED_SECTORS*2)
903 return;
904
905 offset = MD_NEW_SIZE_SECTORS(dsize>>9);
906
907 offset *= 512;
908
909 offset += MD_SB_BYTES;
910
911 lseek64(fd, offset, 0);
912 }
913
914 int write_bitmap0(struct supertype *st, int fd, void *sbv)
915 {
916 unsigned long size;
917 unsigned long long dsize;
918 unsigned long long offset;
919 mdp_super_t *sb = sbv;
920
921 int rv = 0;
922
923 int towrite, n;
924 char buf[4096];
925
926 #ifdef BLKGETSIZE64
927 if (ioctl(fd, BLKGETSIZE64, &dsize) != 0)
928 #endif
929 {
930 if (ioctl(fd, BLKGETSIZE, &size))
931 return 1;
932 else
933 dsize = ((unsigned long long)size)<<9;
934 }
935
936 if (dsize < MD_RESERVED_SECTORS*2)
937 return -1;
938
939 offset = MD_NEW_SIZE_SECTORS(dsize>>9);
940
941 offset *= 512;
942
943 if (lseek64(fd, offset + 4096, 0)< 0LL)
944 return 3;
945
946
947 if (write(fd, ((char*)sb)+MD_SB_BYTES, sizeof(bitmap_super_t)) !=
948 sizeof(bitmap_super_t))
949 return -2;
950 towrite = 64*1024 - MD_SB_BYTES - sizeof(bitmap_super_t);
951 memset(buf, 0xff, sizeof(buf));
952 while (towrite > 0) {
953 n = towrite;
954 if (n > sizeof(buf))
955 n = sizeof(buf);
956 n = write(fd, buf, n);
957 if (n > 0)
958 towrite -= n;
959 else
960 break;
961 }
962 fsync(fd);
963 if (towrite)
964 rv = -2;
965
966 return rv;
967 }
968
969 struct superswitch super0 = {
970 #ifndef MDASSEMBLE
971 .examine_super = examine_super0,
972 .brief_examine_super = brief_examine_super0,
973 .detail_super = detail_super0,
974 .brief_detail_super = brief_detail_super0,
975 #endif
976 .match_home = match_home0,
977 .uuid_from_super = uuid_from_super0,
978 .getinfo_super = getinfo_super0,
979 .update_super = update_super0,
980 .event_super = event_super0,
981 .init_super = init_super0,
982 .add_to_super = add_to_super0,
983 .store_super = store_super0,
984 .write_init_super = write_init_super0,
985 .compare_super = compare_super0,
986 .load_super = load_super0,
987 .match_metadata_desc = match_metadata_desc0,
988 .avail_size = avail_size0,
989 .add_internal_bitmap = add_internal_bitmap0,
990 .locate_bitmap = locate_bitmap0,
991 .write_bitmap = write_bitmap0,
992 .major = 0,
993 .swapuuid = 0,
994 };
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