2 * mdadm - manage Linux "md" devices aka RAID arrays.
4 * Copyright (C) 2001-2006 Neil Brown <neilb@suse.de>
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.
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.
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
22 * Email: <neilb@cse.unsw.edu.au>
24 * School of Computer Science and Engineering
25 * The University of New South Wales
30 #define HAVE_STDINT_H 1
34 * All handling for the 0.90.0 version superblock is in
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
45 static unsigned long calc_sb0_csum(mdp_super_t
*super
)
47 unsigned long csum
= super
->sb_csum
;
48 unsigned long newcsum
;
50 newcsum
= calc_csum(super
, MD_SB_BYTES
);
51 super
->sb_csum
= csum
;
56 void super0_swap_endian(struct mdp_superblock_s
*sb
)
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
62 * We then also have to swap the events_hi and events_lo
64 char *sbc
= (char *)sb
;
68 for (i
=0; i
< MD_SB_BYTES
; i
+=4) {
77 sb
->events_hi
= sb
->events_lo
;
80 t32
= sb
->cp_events_hi
;
81 sb
->cp_events_hi
= sb
->cp_events_lo
;
82 sb
->cp_events_lo
= t32
;
88 static void examine_super0(struct supertype
*st
, void *sbv
, char *homehost
)
90 mdp_super_t
*sb
= sbv
;
95 printf(" Magic : %08x\n", sb
->md_magic
);
96 printf(" Version : %02d.%02d.%02d\n", sb
->major_version
, sb
->minor_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
);
103 void *hash
= sha1_buffer(homehost
,
106 if (memcmp(&sb
->set_uuid2
, hash
, 8)==0)
107 printf(" (local to host %s)", homehost
);
111 printf(" UUID : %08x\n", sb
->set_uuid0
);
113 if (sb
->not_persistent
)
114 printf(" Eedk : not persistent\n");
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) {
122 printf(" Used Dev Size : %d%s\n", sb
->size
,
123 human_size((long long)sb
->size
<<10));
125 case 1: ddsks
=1;break;
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);
132 printf(" Array Size : %llu%s\n", (unsigned long long)ddsks
* sb
->size
,
133 human_size(ddsks
*(long long)sb
->size
<<10));
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
);
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
);
144 printf(" (%d->%d)\n", sb
->raid_disks
-sb
->delta_disks
, sb
->raid_disks
);
146 printf(" (%d->%d)\n", sb
->raid_disks
, sb
->raid_disks
+sb
->delta_disks
);
148 if (sb
->new_level
!= sb
->level
) {
149 c
= map_num(pers
, sb
->new_level
);
150 printf(" New Level : %s\n", c
?c
:"-unknown-");
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-");
157 if (sb
->level
== 10) {
158 printf(" New Layout : near=%d, %s=%d\n",
160 (sb
->new_layout
&0x10000)?"offset":"far",
161 (sb
->new_layout
>>8)&255);
164 if (sb
->new_chunk
!= sb
->chunk_size
)
165 printf(" New Chunksize : %d\n", sb
->new_chunk
);
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
);
181 printf(" Checksum : %x - expected %lx\n", sb
->sb_csum
, calc_sb0_csum(sb
));
182 printf(" Events : %d.%d\n", sb
->events_hi
, sb
->events_lo
);
184 if (sb
->level
== 5) {
185 c
= map_num(r5layout
, sb
->layout
);
186 printf(" Layout : %s\n", c
?c
:"-unknown-");
188 if (sb
->level
== 10) {
189 printf(" Layout : near=%d, %s=%d\n",
191 (sb
->layout
&0x10000)?"offset":"far",
192 (sb
->layout
>>8)&255);
200 printf(" Chunk Size : %dK\n", sb
->chunk_size
/1024);
203 printf(" Rounding : %dK\n", sb
->chunk_size
/1024);
208 printf(" Number Major Minor RaidDevice State\n");
209 for (d
= -1; d
<(signed int)(sb
->raid_disks
+sb
->spare_disks
); d
++) {
214 if (d
>=0) dp
= &sb
->disks
[d
];
215 else dp
= &sb
->this_disk
;
216 snprintf(nb
, sizeof(nb
), "%4d", d
);
217 printf("%4s %5d %5d %5d %5d ", d
< 0 ? "this" : nb
,
218 dp
->number
, dp
->major
, dp
->minor
, dp
->raid_disk
);
219 wonly
= dp
->state
& (1<<MD_DISK_WRITEMOSTLY
);
220 dp
->state
&= ~(1<<MD_DISK_WRITEMOSTLY
);
221 if (dp
->state
& (1<<MD_DISK_FAULTY
)) printf(" faulty");
222 if (dp
->state
& (1<<MD_DISK_ACTIVE
)) printf(" active");
223 if (dp
->state
& (1<<MD_DISK_SYNC
)) printf(" sync");
224 if (dp
->state
& (1<<MD_DISK_REMOVED
)) printf(" removed");
225 if (wonly
) printf(" write-mostly");
226 if (dp
->state
== 0) printf(" spare");
227 if ((dv
=map_dev(dp
->major
, dp
->minor
, 0)))
230 if (d
== -1) printf("\n");
234 static void brief_examine_super0(struct supertype
*st
, void *sbv
)
236 mdp_super_t
*sb
= sbv
;
237 char *c
=map_num(pers
, sb
->level
);
240 sprintf(devname
, "/dev/md%d", sb
->md_minor
);
242 printf("ARRAY %s level=%s num-devices=%d UUID=",
244 c
?c
:"-unknown-", sb
->raid_disks
);
245 if (sb
->minor_version
>= 90)
246 printf("%08x:%08x:%08x:%08x", sb
->set_uuid0
, sb
->set_uuid1
,
247 sb
->set_uuid2
, sb
->set_uuid3
);
249 printf("%08x", sb
->set_uuid0
);
253 static void detail_super0(struct supertype
*st
, void *sbv
, char *homehost
)
255 mdp_super_t
*sb
= sbv
;
257 if (sb
->minor_version
>= 90)
258 printf("%08x:%08x:%08x:%08x", sb
->set_uuid0
, sb
->set_uuid1
,
259 sb
->set_uuid2
, sb
->set_uuid3
);
261 printf("%08x", sb
->set_uuid0
);
264 void *hash
= sha1_buffer(homehost
,
267 if (memcmp(&sb
->set_uuid2
, hash
, 8)==0)
268 printf(" (local to host %s)", homehost
);
270 printf("\n Events : %d.%d\n\n", sb
->events_hi
, sb
->events_lo
);
273 static void brief_detail_super0(struct supertype
*st
, void *sbv
)
275 mdp_super_t
*sb
= sbv
;
277 if (sb
->minor_version
>= 90)
278 printf("%08x:%08x:%08x:%08x", sb
->set_uuid0
, sb
->set_uuid1
,
279 sb
->set_uuid2
, sb
->set_uuid3
);
281 printf("%08x", sb
->set_uuid0
);
284 static void export_super0(struct supertype
*st
, void *sbv
)
286 mdp_super_t
*sb
= sbv
;
288 if (sb
->minor_version
>= 90)
289 printf("%08x:%08x:%08x:%08x", sb
->set_uuid0
, sb
->set_uuid1
,
290 sb
->set_uuid2
, sb
->set_uuid3
);
292 printf("%08x", sb
->set_uuid0
);
297 static int match_home0(struct supertype
*st
, void *sbv
, char *homehost
)
299 mdp_super_t
*sb
= sbv
;
301 char *hash
= sha1_buffer(homehost
,
305 return (memcmp(&sb
->set_uuid2
, hash
, 8)==0);
308 static void uuid_from_super0(struct supertype
*st
, int uuid
[4], void * sbv
)
310 mdp_super_t
*super
= sbv
;
311 uuid
[0] = super
->set_uuid0
;
312 if (super
->minor_version
>= 90) {
313 uuid
[1] = super
->set_uuid1
;
314 uuid
[2] = super
->set_uuid2
;
315 uuid
[3] = super
->set_uuid3
;
323 static void getinfo_super0(struct supertype
*st
, struct mdinfo
*info
, void *sbv
)
325 mdp_super_t
*sb
= sbv
;
329 info
->array
.major_version
= sb
->major_version
;
330 info
->array
.minor_version
= sb
->minor_version
;
331 info
->array
.patch_version
= sb
->patch_version
;
332 info
->array
.raid_disks
= sb
->raid_disks
;
333 info
->array
.level
= sb
->level
;
334 info
->array
.layout
= sb
->layout
;
335 info
->array
.md_minor
= sb
->md_minor
;
336 info
->array
.ctime
= sb
->ctime
;
337 info
->array
.utime
= sb
->utime
;
338 info
->array
.chunk_size
= sb
->chunk_size
;
339 info
->array
.state
= sb
->state
;
340 info
->component_size
= sb
->size
*2;
342 info
->disk
.state
= sb
->this_disk
.state
;
343 info
->disk
.major
= sb
->this_disk
.major
;
344 info
->disk
.minor
= sb
->this_disk
.minor
;
345 info
->disk
.raid_disk
= sb
->this_disk
.raid_disk
;
346 info
->disk
.number
= sb
->this_disk
.number
;
348 info
->events
= md_event(sb
);
349 info
->data_offset
= 0;
351 uuid_from_super0(st
, info
->uuid
, sbv
);
353 if (sb
->minor_version
> 90 && (sb
->reshape_position
+1) != 0) {
354 info
->reshape_active
= 1;
355 info
->reshape_progress
= sb
->reshape_position
;
356 info
->new_level
= sb
->new_level
;
357 info
->delta_disks
= sb
->delta_disks
;
358 info
->new_layout
= sb
->new_layout
;
359 info
->new_chunk
= sb
->new_chunk
;
361 info
->reshape_active
= 0;
363 sprintf(info
->name
, "%d", sb
->md_minor
);
364 /* work_disks is calculated rather than read directly */
365 for (i
=0; i
< MD_SB_DISKS
; i
++)
366 if ((sb
->disks
[i
].state
& (1<<MD_DISK_SYNC
)) &&
367 (sb
->disks
[i
].raid_disk
< info
->array
.raid_disks
) &&
368 (sb
->disks
[i
].state
& (1<<MD_DISK_ACTIVE
)) &&
369 !(sb
->disks
[i
].state
& (1<<MD_DISK_FAULTY
)))
371 info
->array
.working_disks
= working
;
375 static int update_super0(struct supertype
*st
, struct mdinfo
*info
,
376 void *sbv
, char *update
,
377 char *devname
, int verbose
,
378 int uuid_set
, char *homehost
)
380 /* NOTE: for 'assemble' and 'force' we need to return non-zero if any change was made.
381 * For others, the return value is ignored.
384 mdp_super_t
*sb
= sbv
;
385 if (strcmp(update
, "sparc2.2")==0 ) {
386 /* 2.2 sparc put the events in the wrong place
387 * So we copy the tail of the superblock
388 * up 4 bytes before continuing
390 __u32
*sb32
= (__u32
*)sb
;
391 memcpy(sb32
+MD_SB_GENERIC_CONSTANT_WORDS
+7,
392 sb32
+MD_SB_GENERIC_CONSTANT_WORDS
+7+1,
393 (MD_SB_WORDS
- (MD_SB_GENERIC_CONSTANT_WORDS
+7+1))*4);
395 fprintf (stderr
, Name
": adjusting superblock of %s for 2.2/sparc compatability.\n",
398 if (strcmp(update
, "super-minor") ==0) {
399 sb
->md_minor
= info
->array
.md_minor
;
401 fprintf(stderr
, Name
": updating superblock of %s with minor number %d\n",
402 devname
, info
->array
.md_minor
);
404 if (strcmp(update
, "summaries") == 0) {
406 /* set nr_disks, active_disks, working_disks,
407 * failed_disks, spare_disks based on disks[]
408 * array in superblock.
409 * Also make sure extra slots aren't 'failed'
411 sb
->nr_disks
= sb
->active_disks
=
412 sb
->working_disks
= sb
->failed_disks
=
414 for (i
=0; i
< MD_SB_DISKS
; i
++)
415 if (sb
->disks
[i
].major
||
416 sb
->disks
[i
].minor
) {
417 int state
= sb
->disks
[i
].state
;
418 if (state
& (1<<MD_DISK_REMOVED
))
421 if (state
& (1<<MD_DISK_ACTIVE
))
423 if (state
& (1<<MD_DISK_FAULTY
))
429 } else if (i
>= sb
->raid_disks
&& sb
->disks
[i
].number
== 0)
430 sb
->disks
[i
].state
= 0;
432 if (strcmp(update
, "force-one")==0) {
433 /* Not enough devices for a working array, so
434 * bring this one up-to-date.
436 __u32 ehi
= sb
->events_hi
, elo
= sb
->events_lo
;
437 sb
->events_hi
= (info
->events
>>32) & 0xFFFFFFFF;
438 sb
->events_lo
= (info
->events
) & 0xFFFFFFFF;
439 if (sb
->events_hi
!= ehi
||
440 sb
->events_lo
!= elo
)
443 if (strcmp(update
, "force-array")==0) {
444 /* degraded array and 'force' requested, so
445 * maybe need to mark it 'clean'
447 if ((sb
->level
== 5 || sb
->level
== 4 || sb
->level
== 6) &&
448 (sb
->state
& (1 << MD_SB_CLEAN
)) == 0) {
449 /* need to force clean */
450 sb
->state
|= (1 << MD_SB_CLEAN
);
454 if (strcmp(update
, "assemble")==0) {
455 int d
= info
->disk
.number
;
456 int wonly
= sb
->disks
[d
].state
& (1<<MD_DISK_WRITEMOSTLY
);
457 if ((sb
->disks
[d
].state
& ~(1<<MD_DISK_WRITEMOSTLY
))
458 != info
->disk
.state
) {
459 sb
->disks
[d
].state
= info
->disk
.state
| wonly
;
463 if (strcmp(update
, "linear-grow-new") == 0) {
464 memset(&sb
->disks
[info
->disk
.number
], 0, sizeof(sb
->disks
[0]));
465 sb
->disks
[info
->disk
.number
].number
= info
->disk
.number
;
466 sb
->disks
[info
->disk
.number
].major
= info
->disk
.major
;
467 sb
->disks
[info
->disk
.number
].minor
= info
->disk
.minor
;
468 sb
->disks
[info
->disk
.number
].raid_disk
= info
->disk
.raid_disk
;
469 sb
->disks
[info
->disk
.number
].state
= info
->disk
.state
;
470 sb
->this_disk
= sb
->disks
[info
->disk
.number
];
472 if (strcmp(update
, "linear-grow-update") == 0) {
473 sb
->raid_disks
= info
->array
.raid_disks
;
474 sb
->nr_disks
= info
->array
.nr_disks
;
475 sb
->active_disks
= info
->array
.active_disks
;
476 sb
->working_disks
= info
->array
.working_disks
;
477 memset(&sb
->disks
[info
->disk
.number
], 0, sizeof(sb
->disks
[0]));
478 sb
->disks
[info
->disk
.number
].number
= info
->disk
.number
;
479 sb
->disks
[info
->disk
.number
].major
= info
->disk
.major
;
480 sb
->disks
[info
->disk
.number
].minor
= info
->disk
.minor
;
481 sb
->disks
[info
->disk
.number
].raid_disk
= info
->disk
.raid_disk
;
482 sb
->disks
[info
->disk
.number
].state
= info
->disk
.state
;
484 if (strcmp(update
, "resync") == 0) {
485 /* make sure resync happens */
486 sb
->state
&= ~(1<<MD_SB_CLEAN
);
489 if (strcmp(update
, "homehost") == 0 &&
493 info
->uuid
[0] = sb
->set_uuid0
;
494 info
->uuid
[1] = sb
->set_uuid1
;
496 if (strcmp(update
, "uuid") == 0) {
497 if (!uuid_set
&& homehost
) {
499 char *hash
= sha1_buffer(homehost
,
502 memcpy(info
->uuid
+2, hash
, 8);
504 sb
->set_uuid0
= info
->uuid
[0];
505 sb
->set_uuid1
= info
->uuid
[1];
506 sb
->set_uuid2
= info
->uuid
[2];
507 sb
->set_uuid3
= info
->uuid
[3];
508 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
509 struct bitmap_super_s
*bm
;
510 bm
= (struct bitmap_super_s
*)(sb
+1);
511 uuid_from_super0(st
, (int*)bm
->uuid
, sbv
);
514 if (strcmp(update
, "_reshape_progress")==0)
515 sb
->reshape_position
= info
->reshape_progress
;
517 sb
->sb_csum
= calc_sb0_csum(sb
);
522 * For verion-0 superblock, the homehost is 'stored' in the
523 * uuid. 8 bytes for a hash of the host leaving 8 bytes
524 * of random material.
525 * We use the first 8 bytes (64bits) of the sha1 of the
530 static int init_super0(struct supertype
*st
, void **sbp
, mdu_array_info_t
*info
,
531 unsigned long long size
, char *ignored_name
, char *homehost
,
534 mdp_super_t
*sb
= malloc(MD_SB_BYTES
+ sizeof(bitmap_super_t
));
536 memset(sb
, 0, MD_SB_BYTES
+ sizeof(bitmap_super_t
));
539 if (info
->major_version
== -1) {
540 /* zeroing the superblock */
545 spares
= info
->working_disks
- info
->active_disks
;
546 if (info
->raid_disks
+ spares
> MD_SB_DISKS
) {
547 fprintf(stderr
, Name
": too many devices requested: %d+%d > %d\n",
548 info
->raid_disks
, spares
, MD_SB_DISKS
);
552 sb
->md_magic
= MD_SB_MAGIC
;
553 sb
->major_version
= 0;
554 sb
->minor_version
= 90;
555 sb
->patch_version
= 0;
556 sb
->gvalid_words
= 0; /* ignored */
558 sb
->level
= info
->level
;
559 if (size
!= info
->size
)
561 sb
->size
= info
->size
;
562 sb
->nr_disks
= info
->nr_disks
;
563 sb
->raid_disks
= info
->raid_disks
;
564 sb
->md_minor
= info
->md_minor
;
565 sb
->not_persistent
= 0;
567 sb
->set_uuid0
= uuid
[0];
568 sb
->set_uuid1
= uuid
[1];
569 sb
->set_uuid2
= uuid
[2];
570 sb
->set_uuid3
= uuid
[3];
572 int rfd
= open("/dev/urandom", O_RDONLY
);
573 if (rfd
< 0 || read(rfd
, &sb
->set_uuid0
, 4) != 4)
574 sb
->set_uuid0
= random();
575 if (rfd
< 0 || read(rfd
, &sb
->set_uuid1
, 12) != 12) {
576 sb
->set_uuid1
= random();
577 sb
->set_uuid2
= random();
578 sb
->set_uuid3
= random();
585 char *hash
= sha1_buffer(homehost
,
588 memcpy(&sb
->set_uuid2
, hash
, 8);
591 sb
->utime
= sb
->ctime
;
592 sb
->state
= info
->state
;
593 sb
->active_disks
= info
->active_disks
;
594 sb
->working_disks
= info
->working_disks
;
595 sb
->failed_disks
= info
->failed_disks
;
596 sb
->spare_disks
= info
->spare_disks
;
600 sb
->layout
= info
->layout
;
601 sb
->chunk_size
= info
->chunk_size
;
607 /* Add a device to the superblock being created */
608 static void add_to_super0(struct supertype
*st
, void *sbv
, mdu_disk_info_t
*dinfo
)
610 mdp_super_t
*sb
= sbv
;
611 mdp_disk_t
*dk
= &sb
->disks
[dinfo
->number
];
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
;
620 static int store_super0(struct supertype
*st
, int fd
, void *sbv
)
622 unsigned long long dsize
;
623 unsigned long long offset
;
624 mdp_super_t
*super
= sbv
;
626 if (!get_dev_size(fd
, NULL
, &dsize
))
629 if (dsize
< MD_RESERVED_SECTORS
*512)
632 offset
= MD_NEW_SIZE_SECTORS(dsize
>>9);
636 if (lseek64(fd
, offset
, 0)< 0LL)
639 if (write(fd
, super
, sizeof(*super
)) != sizeof(*super
))
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
))
653 static int write_init_super0(struct supertype
*st
, void *sbv
, mdu_disk_info_t
*dinfo
, char *devname
)
655 mdp_super_t
*sb
= sbv
;
656 int fd
= open(devname
, O_RDWR
|O_EXCL
);
660 fprintf(stderr
, Name
": Failed to open %s to write superblock\n", devname
);
664 sb
->disks
[dinfo
->number
].state
&= ~(1<<MD_DISK_FAULTY
);
666 sb
->this_disk
= sb
->disks
[dinfo
->number
];
667 sb
->sb_csum
= calc_sb0_csum(sb
);
668 rv
= store_super0(st
, fd
, sb
);
670 if (rv
== 0 && (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
)))
671 rv
= st
->ss
->write_bitmap(st
, fd
, sbv
);
675 fprintf(stderr
, Name
": failed to write superblock to %s\n", devname
);
679 static int compare_super0(struct supertype
*st
, struct supertype
*tst
)
683 * 0 same, or first was empty, and second was copied
684 * 1 second had wrong number
688 mdp_super_t
*first
= st
->sb
;
689 mdp_super_t
*second
= tst
->sb
;
690 int uuid1
[4], uuid2
[4];
692 if (second
->md_magic
!= MD_SB_MAGIC
)
695 first
= malloc(MD_SB_BYTES
+ sizeof(struct bitmap_super_s
));
696 memcpy(first
, second
, MD_SB_BYTES
+ sizeof(struct bitmap_super_s
));
701 uuid_from_super0(NULL
, uuid1
, first
);
702 uuid_from_super0(NULL
, uuid2
, second
);
703 if (!same_uuid(uuid1
, uuid2
, 0))
705 if (first
->major_version
!= second
->major_version
||
706 first
->minor_version
!= second
->minor_version
||
707 first
->patch_version
!= second
->patch_version
||
708 first
->gvalid_words
!= second
->gvalid_words
||
709 first
->ctime
!= second
->ctime
||
710 first
->level
!= second
->level
||
711 first
->size
!= second
->size
||
712 first
->raid_disks
!= second
->raid_disks
)
719 static int load_super0(struct supertype
*st
, int fd
, void **sbp
, char *devname
)
721 /* try to read in the superblock
724 * 1 on cannot get superblock
725 * 2 on superblock meaningless
727 unsigned long long dsize
;
728 unsigned long long offset
;
731 struct bitmap_super_s
*bsb
;
733 if (!get_dev_size(fd
, devname
, &dsize
))
736 if (dsize
< MD_RESERVED_SECTORS
*512) {
739 ": %s is too small for md: size is %llu sectors.\n",
744 offset
= MD_NEW_SIZE_SECTORS(dsize
>>9);
748 ioctl(fd
, BLKFLSBUF
, 0); /* make sure we read current data */
750 if (lseek64(fd
, offset
, 0)< 0LL) {
752 fprintf(stderr
, Name
": Cannot seek to superblock on %s: %s\n",
753 devname
, strerror(errno
));
757 super
= malloc(MD_SB_BYTES
+ sizeof(bitmap_super_t
));
759 if (read(fd
, super
, sizeof(*super
)) != MD_SB_BYTES
) {
761 fprintf(stderr
, Name
": Cannot read superblock on %s\n",
767 if (st
->ss
&& st
->minor_version
== 9)
768 super0_swap_endian(super
);
770 if (super
->md_magic
!= MD_SB_MAGIC
) {
772 fprintf(stderr
, Name
": No super block found on %s (Expected magic %08x, got %08x)\n",
773 devname
, MD_SB_MAGIC
, super
->md_magic
);
778 if (super
->major_version
!= 0) {
780 fprintf(stderr
, Name
": Cannot interpret superblock on %s - version is %d\n",
781 devname
, super
->major_version
);
787 if (st
->ss
== NULL
) {
789 st
->minor_version
= 90;
790 st
->max_devs
= MD_SB_DISKS
;
793 /* Now check on the bitmap superblock */
794 if ((super
->state
& (1<<MD_SB_BITMAP_PRESENT
)) == 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.
800 if (read(fd
, super
+1, sizeof(struct bitmap_super_s
))
801 != sizeof(struct bitmap_super_s
))
804 uuid_from_super0(st
, 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)
812 super
->state
&= ~(1<<MD_SB_BITMAP_PRESENT
);
817 static struct supertype
*match_metadata_desc0(char *arg
)
819 struct supertype
*st
= malloc(sizeof(*st
));
823 st
->minor_version
= 90;
824 st
->max_devs
= MD_SB_DISKS
;
826 if (strcmp(arg
, "0") == 0 ||
827 strcmp(arg
, "0.90") == 0 ||
828 strcmp(arg
, "default") == 0
832 st
->minor_version
= 9; /* flag for 'byte-swapped' */
833 if (strcmp(arg
, "0.swap")==0)
840 static __u64
avail_size0(struct supertype
*st
, __u64 devsize
)
842 if (devsize
< MD_RESERVED_SECTORS
)
844 return MD_NEW_SIZE_SECTORS(devsize
);
847 static int add_internal_bitmap0(struct supertype
*st
, void *sbv
, int *chunkp
,
848 int delay
, int write_behind
,
849 unsigned long long size
, int may_change
,
853 * The bitmap comes immediately after the superblock and must be 60K in size
854 * at most. The default size is between 30K and 60K
856 * size is in sectors, chunk is in bytes !!!
858 unsigned long long bits
;
859 unsigned long long max_bits
= 60*1024*8;
860 unsigned long long min_chunk
;
862 mdp_super_t
*sb
= sbv
;
863 bitmap_super_t
*bms
= (bitmap_super_t
*)(((char*)sb
) + MD_SB_BYTES
);
866 min_chunk
= 4096; /* sub-page chunks don't work yet.. */
867 bits
= (size
* 512) / min_chunk
+ 1;
868 while (bits
> max_bits
) {
874 else if (chunk
< min_chunk
)
875 return 0; /* chunk size too small */
877 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
879 memset(bms
, 0, sizeof(*bms
));
880 bms
->magic
= __cpu_to_le32(BITMAP_MAGIC
);
881 bms
->version
= __cpu_to_le32(major
);
882 uuid_from_super0(st
, (int*)bms
->uuid
, sb
);
883 bms
->chunksize
= __cpu_to_le32(chunk
);
884 bms
->daemon_sleep
= __cpu_to_le32(delay
);
885 bms
->sync_size
= __cpu_to_le64(size
);
886 bms
->write_behind
= __cpu_to_le32(write_behind
);
892 void locate_bitmap0(struct supertype
*st
, int fd
, void *sbv
)
894 unsigned long long dsize
;
895 unsigned long long offset
;
897 if (!get_dev_size(fd
, NULL
, &dsize
))
900 if (dsize
< MD_RESERVED_SECTORS
*512)
903 offset
= MD_NEW_SIZE_SECTORS(dsize
>>9);
907 offset
+= MD_SB_BYTES
;
909 lseek64(fd
, offset
, 0);
912 int write_bitmap0(struct supertype
*st
, int fd
, void *sbv
)
914 unsigned long long dsize
;
915 unsigned long long offset
;
916 mdp_super_t
*sb
= sbv
;
923 if (!get_dev_size(fd
, NULL
, &dsize
))
927 if (dsize
< MD_RESERVED_SECTORS
*512)
930 offset
= MD_NEW_SIZE_SECTORS(dsize
>>9);
934 if (lseek64(fd
, offset
+ 4096, 0)< 0LL)
938 if (write(fd
, ((char*)sb
)+MD_SB_BYTES
, sizeof(bitmap_super_t
)) !=
939 sizeof(bitmap_super_t
))
941 towrite
= 64*1024 - MD_SB_BYTES
- sizeof(bitmap_super_t
);
942 memset(buf
, 0xff, sizeof(buf
));
943 while (towrite
> 0) {
947 n
= write(fd
, buf
, n
);
960 static void free_super0(struct supertype
*st
, void *super
)
966 struct superswitch super0
= {
968 .examine_super
= examine_super0
,
969 .brief_examine_super
= brief_examine_super0
,
970 .detail_super
= detail_super0
,
971 .brief_detail_super
= brief_detail_super0
,
972 .export_super
= export_super0
,
974 .match_home
= match_home0
,
975 .uuid_from_super
= uuid_from_super0
,
976 .getinfo_super
= getinfo_super0
,
977 .update_super
= update_super0
,
978 .init_super
= init_super0
,
979 .add_to_super
= add_to_super0
,
980 .store_super
= store_super0
,
981 .write_init_super
= write_init_super0
,
982 .compare_super
= compare_super0
,
983 .load_super
= load_super0
,
984 .match_metadata_desc
= match_metadata_desc0
,
985 .avail_size
= avail_size0
,
986 .add_internal_bitmap
= add_internal_bitmap0
,
987 .locate_bitmap
= locate_bitmap0
,
988 .write_bitmap
= write_bitmap0
,
989 .free_super
= free_super0
,