Change write_init_super to be called only once.
[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 struct devinfo {
627         int fd;
628         char *devname;
629         mdu_disk_info_t disk;
630         struct devinfo *next;
631 };
632 /* Add a device to the superblock being created */
633 static void add_to_super0(struct supertype *st, mdu_disk_info_t *dinfo,
634                           int fd, char *devname)
635 {
636         mdp_super_t *sb = st->sb;
637         mdp_disk_t *dk = &sb->disks[dinfo->number];
638         struct devinfo *di, **dip;
639
640         dk->number = dinfo->number;
641         dk->major = dinfo->major;
642         dk->minor = dinfo->minor;
643         dk->raid_disk = dinfo->raid_disk;
644         dk->state = dinfo->state;
645
646         dip = (struct devinfo **)&st->info;
647         while (*dip)
648                 dip = &(*dip)->next;
649         di = malloc(sizeof(struct devinfo));
650         di->fd = fd;
651         di->devname = devname;
652         di->disk = *dinfo;
653         di->next = NULL;
654         *dip = di;
655 }
656
657 static int store_super0(struct supertype *st, int fd)
658 {
659         unsigned long long dsize;
660         unsigned long long offset;
661         mdp_super_t *super = st->sb;
662
663         if (!get_dev_size(fd, NULL, &dsize))
664                 return 1;
665
666         if (dsize < MD_RESERVED_SECTORS*512)
667                 return 2;
668
669         offset = MD_NEW_SIZE_SECTORS(dsize>>9);
670
671         offset *= 512;
672
673         if (lseek64(fd, offset, 0)< 0LL)
674                 return 3;
675
676         if (write(fd, super, sizeof(*super)) != sizeof(*super))
677                 return 4;
678
679         if (super->state & (1<<MD_SB_BITMAP_PRESENT)) {
680                 struct bitmap_super_s * bm = (struct bitmap_super_s*)(super+1);
681                 if (__le32_to_cpu(bm->magic) == BITMAP_MAGIC)
682                         if (write(fd, bm, sizeof(*bm)) != sizeof(*bm))
683                             return 5;
684         }
685
686         fsync(fd);
687         return 0;
688 }
689
690 #ifndef MDASSEMBLE
691 static int write_init_super0(struct supertype *st)
692 {
693         mdp_super_t *sb = st->sb;
694         int rv = 0;
695         struct devinfo *di;
696
697         for (di = st->info ; di && ! rv ; di = di->next) {
698
699                 if (di->disk.state == 1)
700                         continue;
701                 Kill(di->devname, 0, 1, 1);
702                 Kill(di->devname, 0, 1, 1);
703
704                 sb->disks[di->disk.number].state &= ~(1<<MD_DISK_FAULTY);
705
706                 sb->this_disk = sb->disks[di->disk.number];
707                 sb->sb_csum = calc_sb0_csum(sb);
708                 rv = store_super0(st, di->fd);
709
710                 if (rv == 0 && (sb->state & (1<<MD_SB_BITMAP_PRESENT)))
711                         rv = st->ss->write_bitmap(st, di->fd);
712
713                 if (rv)
714                         fprintf(stderr,
715                                 Name ": failed to write superblock to %s\n",
716                                 di->devname);
717                 close(di->fd);
718                 di->fd = -1;
719         }
720         return rv;
721 }
722 #endif
723
724 static int compare_super0(struct supertype *st, struct supertype *tst)
725 {
726         /*
727          * return:
728          *  0 same, or first was empty, and second was copied
729          *  1 second had wrong number
730          *  2 wrong uuid
731          *  3 wrong other info
732          */
733         mdp_super_t *first = st->sb;
734         mdp_super_t *second = tst->sb;
735         int uuid1[4], uuid2[4];
736
737         if (second->md_magic != MD_SB_MAGIC)
738                 return 1;
739         if (!first) {
740                 first = malloc(MD_SB_BYTES + sizeof(struct bitmap_super_s));
741                 memcpy(first, second, MD_SB_BYTES + sizeof(struct bitmap_super_s));
742                 st->sb = first;
743                 return 0;
744         }
745
746         uuid_from_super0(st, uuid1);
747         uuid_from_super0(tst, uuid2);
748         if (!same_uuid(uuid1, uuid2, 0))
749                 return 2;
750         if (first->major_version != second->major_version ||
751             first->minor_version != second->minor_version ||
752             first->patch_version != second->patch_version ||
753             first->gvalid_words  != second->gvalid_words  ||
754             first->ctime         != second->ctime         ||
755             first->level         != second->level         ||
756             first->size          != second->size          ||
757             first->raid_disks    != second->raid_disks    )
758                 return 3;
759
760         return 0;
761 }
762
763
764 static void free_super0(struct supertype *st);
765
766 static int load_super0(struct supertype *st, int fd, char *devname)
767 {
768         /* try to read in the superblock
769          * Return:
770          *  0 on success
771          *  1 on cannot get superblock
772          *  2 on superblock meaningless
773          */
774         unsigned long long dsize;
775         unsigned long long offset;
776         mdp_super_t *super;
777         int uuid[4];
778         struct bitmap_super_s *bsb;
779
780         free_super0(st);
781
782         if (!get_dev_size(fd, devname, &dsize))
783                 return 1;
784
785         if (dsize < MD_RESERVED_SECTORS*512) {
786                 if (devname)
787                         fprintf(stderr, Name
788                             ": %s is too small for md: size is %llu sectors.\n",
789                                 devname, dsize);
790                 return 1;
791         }
792
793         offset = MD_NEW_SIZE_SECTORS(dsize>>9);
794
795         offset *= 512;
796
797         ioctl(fd, BLKFLSBUF, 0); /* make sure we read current data */
798
799         if (lseek64(fd, offset, 0)< 0LL) {
800                 if (devname)
801                         fprintf(stderr, Name ": Cannot seek to superblock on %s: %s\n",
802                                 devname, strerror(errno));
803                 return 1;
804         }
805
806         super = malloc(MD_SB_BYTES + sizeof(bitmap_super_t));
807
808         if (read(fd, super, sizeof(*super)) != MD_SB_BYTES) {
809                 if (devname)
810                         fprintf(stderr, Name ": Cannot read superblock on %s\n",
811                                 devname);
812                 free(super);
813                 return 1;
814         }
815
816         if (st->ss && st->minor_version == 9)
817                 super0_swap_endian(super);
818
819         if (super->md_magic != MD_SB_MAGIC) {
820                 if (devname)
821                         fprintf(stderr, Name ": No super block found on %s (Expected magic %08x, got %08x)\n",
822                                 devname, MD_SB_MAGIC, super->md_magic);
823                 free(super);
824                 return 2;
825         }
826
827         if (super->major_version != 0) {
828                 if (devname)
829                         fprintf(stderr, Name ": Cannot interpret superblock on %s - version is %d\n",
830                                 devname, super->major_version);
831                 free(super);
832                 return 2;
833         }
834         st->sb = super;
835
836         if (st->ss == NULL) {
837                 st->ss = &super0;
838                 st->minor_version = super->minor_version;
839                 st->max_devs = MD_SB_DISKS;
840                 st->info = NULL;
841         }
842
843         /* Now check on the bitmap superblock */
844         if ((super->state & (1<<MD_SB_BITMAP_PRESENT)) == 0)
845                 return 0;
846         /* Read the bitmap superblock and make sure it looks
847          * valid.  If it doesn't clear the bit.  An --assemble --force
848          * should get that written out.
849          */
850         if (read(fd, super+1, sizeof(struct bitmap_super_s))
851             != sizeof(struct bitmap_super_s))
852                 goto no_bitmap;
853
854         uuid_from_super0(st, uuid);
855         bsb = (struct bitmap_super_s *)(super+1);
856         if (__le32_to_cpu(bsb->magic) != BITMAP_MAGIC ||
857             memcmp(bsb->uuid, uuid, 16) != 0)
858                 goto no_bitmap;
859         return 0;
860
861  no_bitmap:
862         super->state &= ~(1<<MD_SB_BITMAP_PRESENT);
863
864         return 0;
865 }
866
867 static struct supertype *match_metadata_desc0(char *arg)
868 {
869         struct supertype *st = malloc(sizeof(*st));
870         if (!st) return st;
871
872         st->ss = &super0;
873         st->info = NULL;
874         st->minor_version = 90;
875         st->max_devs = MD_SB_DISKS;
876         st->sb = NULL;
877         if (strcmp(arg, "0") == 0 ||
878             strcmp(arg, "0.90") == 0 ||
879             strcmp(arg, "0.91") == 0 ||
880             strcmp(arg, "default") == 0 ||
881             strcmp(arg, "") == 0 /* no metadata */
882                 )
883                 return st;
884
885         st->minor_version = 9; /* flag for 'byte-swapped' */
886         if (strcmp(arg, "0.swap")==0 ||
887             strcmp(arg, "0.9") == 0) /* For dup_super support */
888                 return st;
889
890         free(st);
891         return NULL;
892 }
893
894 static __u64 avail_size0(struct supertype *st, __u64 devsize)
895 {
896         if (devsize < MD_RESERVED_SECTORS)
897                 return 0ULL;
898         return MD_NEW_SIZE_SECTORS(devsize);
899 }
900
901 static int add_internal_bitmap0(struct supertype *st, int *chunkp,
902                                 int delay, int write_behind,
903                                 unsigned long long size, int may_change,
904                                 int major)
905 {
906         /*
907          * The bitmap comes immediately after the superblock and must be 60K in size
908          * at most.  The default size is between 30K and 60K
909          *
910          * size is in sectors,  chunk is in bytes !!!
911          */
912         unsigned long long bits;
913         unsigned long long max_bits = 60*1024*8;
914         unsigned long long min_chunk;
915         int chunk = *chunkp;
916         mdp_super_t *sb = st->sb;
917         bitmap_super_t *bms = (bitmap_super_t*)(((char*)sb) + MD_SB_BYTES);
918
919
920         min_chunk = 4096; /* sub-page chunks don't work yet.. */
921         bits = (size * 512) / min_chunk + 1;
922         while (bits > max_bits) {
923                 min_chunk *= 2;
924                 bits = (bits+1)/2;
925         }
926         if (chunk == UnSet)
927                 chunk = min_chunk;
928         else if (chunk < min_chunk)
929                 return 0; /* chunk size too small */
930
931         sb->state |= (1<<MD_SB_BITMAP_PRESENT);
932
933         memset(bms, 0, sizeof(*bms));
934         bms->magic = __cpu_to_le32(BITMAP_MAGIC);
935         bms->version = __cpu_to_le32(major);
936         uuid_from_super0(st, (int*)bms->uuid);
937         bms->chunksize = __cpu_to_le32(chunk);
938         bms->daemon_sleep = __cpu_to_le32(delay);
939         bms->sync_size = __cpu_to_le64(size);
940         bms->write_behind = __cpu_to_le32(write_behind);
941         *chunkp = chunk;
942         return 1;
943 }
944
945
946 void locate_bitmap0(struct supertype *st, int fd)
947 {
948         unsigned long long dsize;
949         unsigned long long offset;
950
951         if (!get_dev_size(fd, NULL, &dsize))
952                 return;
953
954         if (dsize < MD_RESERVED_SECTORS*512)
955                 return;
956
957         offset = MD_NEW_SIZE_SECTORS(dsize>>9);
958
959         offset *= 512;
960
961         offset += MD_SB_BYTES;
962
963         lseek64(fd, offset, 0);
964 }
965
966 int write_bitmap0(struct supertype *st, int fd)
967 {
968         unsigned long long dsize;
969         unsigned long long offset;
970         mdp_super_t *sb = st->sb;
971
972         int rv = 0;
973
974         int towrite, n;
975         char buf[4096];
976
977         if (!get_dev_size(fd, NULL, &dsize))
978                 return 1;
979
980
981         if (dsize < MD_RESERVED_SECTORS*512)
982                 return -1;
983
984         offset = MD_NEW_SIZE_SECTORS(dsize>>9);
985
986         offset *= 512;
987
988         if (lseek64(fd, offset + 4096, 0)< 0LL)
989                 return 3;
990
991
992         if (write(fd, ((char*)sb)+MD_SB_BYTES, sizeof(bitmap_super_t)) !=
993             sizeof(bitmap_super_t))
994                 return -2;
995         towrite = 64*1024 - MD_SB_BYTES - sizeof(bitmap_super_t);
996         memset(buf, 0xff, sizeof(buf));
997         while (towrite > 0) {
998                 n = towrite;
999                 if (n > sizeof(buf))
1000                         n = sizeof(buf);
1001                 n = write(fd, buf, n);
1002                 if (n > 0)
1003                         towrite -= n;
1004                 else
1005                         break;
1006         }
1007         fsync(fd);
1008         if (towrite)
1009                 rv = -2;
1010
1011         return rv;
1012 }
1013
1014 static void free_super0(struct supertype *st)
1015 {
1016         if (st->sb)
1017                 free(st->sb);
1018         st->sb = NULL;
1019 }
1020
1021 static int validate_geometry0(struct supertype *st, int level,
1022                               int layout, int raiddisks,
1023                               int chunk, unsigned long long size,
1024                               char *subdev, unsigned long long *freesize)
1025 {
1026         unsigned long long ldsize;
1027         int fd;
1028
1029         if (level == LEVEL_CONTAINER)
1030                 return 0;
1031         if (raiddisks > MD_SB_DISKS)
1032                 return 0;
1033         if (size > (0x7fffffffULL<<10))
1034                 return 0;
1035         if (!subdev)
1036                 return 1;
1037
1038         fd = open(subdev, O_RDONLY|O_EXCL, 0);
1039         if (fd < 0) {
1040                 fprintf(stderr, Name ": Cannot open %s: %s\n",
1041                         subdev, strerror(errno));
1042                 return 0;
1043         }
1044         if (!get_dev_size(fd, subdev, &ldsize)) {
1045                 close(fd);
1046                 return 0;
1047         }
1048         close(fd);
1049
1050         if (ldsize < MD_RESERVED_SECTORS * 512)
1051                 return 0;
1052         if (size > (0x7fffffffULL<<10))
1053                 return 0;
1054         *freesize = MD_NEW_SIZE_SECTORS(ldsize >> 9);
1055         return 1;
1056 }
1057
1058 struct superswitch super0 = {
1059 #ifndef MDASSEMBLE
1060         .examine_super = examine_super0,
1061         .brief_examine_super = brief_examine_super0,
1062         .export_examine_super = export_examine_super0,
1063         .detail_super = detail_super0,
1064         .brief_detail_super = brief_detail_super0,
1065         .export_detail_super = export_detail_super0,
1066         .write_init_super = write_init_super0,
1067 #endif
1068         .match_home = match_home0,
1069         .uuid_from_super = uuid_from_super0,
1070         .getinfo_super = getinfo_super0,
1071         .update_super = update_super0,
1072         .init_super = init_super0,
1073         .add_to_super = add_to_super0,
1074         .store_super = store_super0,
1075         .compare_super = compare_super0,
1076         .load_super = load_super0,
1077         .match_metadata_desc = match_metadata_desc0,
1078         .avail_size = avail_size0,
1079         .add_internal_bitmap = add_internal_bitmap0,
1080         .locate_bitmap = locate_bitmap0,
1081         .write_bitmap = write_bitmap0,
1082         .free_super = free_super0,
1083         .validate_geometry = validate_geometry0,
1084         .major = 0,
1085         .swapuuid = 0,
1086 };