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
31 #include <openssl/sha.h> /* for SHA1 */
33 * All handling for the 0.90.0 version superblock is in
36 * - finding, loading, and writing the superblock.
37 * - initialising a new superblock
38 * - printing the superblock for --examine
39 * - printing part of the superblock for --detail
44 static unsigned long calc_sb0_csum(mdp_super_t
*super
)
46 unsigned long csum
= super
->sb_csum
;
47 unsigned long newcsum
;
49 newcsum
= calc_csum(super
, MD_SB_BYTES
);
50 super
->sb_csum
= csum
;
55 void super0_swap_endian(struct mdp_superblock_s
*sb
)
57 /* as super0 superblocks are host-endian, it is sometimes
58 * useful to be able to swap the endianness
59 * as (almost) everything is u32's we byte-swap every 4byte
61 * We then also have to swap the events_hi and events_lo
63 char *sbc
= (char *)sb
;
67 for (i
=0; i
< MD_SB_BYTES
; i
+=4) {
76 sb
->events_hi
= sb
->events_lo
;
79 t32
= sb
->cp_events_hi
;
80 sb
->cp_events_hi
= sb
->cp_events_lo
;
81 sb
->cp_events_lo
= t32
;
87 static void examine_super0(void *sbv
, char *homehost
)
89 mdp_super_t
*sb
= sbv
;
94 printf(" Magic : %08x\n", sb
->md_magic
);
95 printf(" Version : %02d.%02d.%02d\n", sb
->major_version
, sb
->minor_version
,
97 if (sb
->minor_version
>= 90) {
98 printf(" UUID : %08x:%08x:%08x:%08x", sb
->set_uuid0
, sb
->set_uuid1
,
99 sb
->set_uuid2
, sb
->set_uuid3
);
101 unsigned char *hash
= SHA1((unsigned char *)homehost
,
104 if (memcmp(&sb
->set_uuid2
, hash
, 8)==0)
105 printf(" (local to host %s)", homehost
);
109 printf(" UUID : %08x\n", sb
->set_uuid0
);
112 printf(" Creation Time : %.24s\n", ctime(&atime
));
113 c
=map_num(pers
, sb
->level
);
114 printf(" Raid Level : %s\n", c
?c
:"-unknown-");
115 if ((int)sb
->level
>= 0) {
117 printf(" Device Size : %d%s\n", sb
->size
, human_size((long long)sb
->size
<<10));
119 case 1: ddsks
=1;break;
121 case 5: ddsks
= sb
->raid_disks
-1; break;
122 case 6: ddsks
= sb
->raid_disks
-2; break;
123 case 10: ddsks
= sb
->raid_disks
/ (sb
->layout
&255) / ((sb
->layout
>>8)&255);
126 printf(" Array Size : %llu%s\n", (unsigned long long)ddsks
* sb
->size
,
127 human_size(ddsks
*(long long)sb
->size
<<10));
129 printf(" Raid Devices : %d\n", sb
->raid_disks
);
130 printf(" Total Devices : %d\n", sb
->nr_disks
);
131 printf("Preferred Minor : %d\n", sb
->md_minor
);
133 if (sb
->minor_version
> 90 && (sb
->reshape_position
+1) != 0) {
134 printf(" Reshape pos'n : %llu%s\n", (unsigned long long)sb
->reshape_position
/2, human_size((long long)sb
->reshape_position
<<9));
135 if (sb
->delta_disks
) {
136 printf(" Delta Devices : %d", sb
->delta_disks
);
138 printf(" (%d->%d)\n", sb
->raid_disks
-sb
->delta_disks
, sb
->raid_disks
);
140 printf(" (%d->%d)\n", sb
->raid_disks
, sb
->raid_disks
+sb
->delta_disks
);
142 if (sb
->new_level
!= sb
->level
) {
143 c
= map_num(pers
, sb
->new_level
);
144 printf(" New Level : %s\n", c
?c
:"-unknown-");
146 if (sb
->new_layout
!= sb
->layout
) {
147 if (sb
->level
== 5) {
148 c
= map_num(r5layout
, sb
->new_layout
);
149 printf(" New Layout : %s\n", c
?c
:"-unknown-");
151 if (sb
->level
== 10) {
152 printf(" New Layout : near=%d, %s=%d\n",
154 (sb
->new_layout
&0x10000)?"offset":"far",
155 (sb
->new_layout
>>8)&255);
158 if (sb
->new_chunk
!= sb
->chunk_size
)
159 printf(" New Chunksize : %d\n", sb
->new_chunk
);
163 printf(" Update Time : %.24s\n", ctime(&atime
));
164 printf(" State : %s\n",
165 (sb
->state
&(1<<MD_SB_CLEAN
))?"clean":"active");
166 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
))
167 printf("Internal Bitmap : present\n");
168 printf(" Active Devices : %d\n", sb
->active_disks
);
169 printf("Working Devices : %d\n", sb
->working_disks
);
170 printf(" Failed Devices : %d\n", sb
->failed_disks
);
171 printf(" Spare Devices : %d\n", sb
->spare_disks
);
172 if (calc_sb0_csum(sb
) == sb
->sb_csum
)
173 printf(" Checksum : %x - correct\n", sb
->sb_csum
);
175 printf(" Checksum : %x - expected %lx\n", sb
->sb_csum
, calc_sb0_csum(sb
));
176 printf(" Events : %d.%d\n", sb
->events_hi
, sb
->events_lo
);
178 if (sb
->level
== 5) {
179 c
= map_num(r5layout
, sb
->layout
);
180 printf(" Layout : %s\n", c
?c
:"-unknown-");
182 if (sb
->level
== 10) {
183 printf(" Layout : near=%d, %s=%d\n",
185 (sb
->layout
&0x10000)?"offset":"far",
186 (sb
->layout
>>8)&255);
192 printf(" Chunk Size : %dK\n", sb
->chunk_size
/1024);
195 printf(" Rounding : %dK\n", sb
->chunk_size
/1024);
200 printf(" Number Major Minor RaidDevice State\n");
201 for (d
= -1; d
<(signed int)(sb
->raid_disks
+sb
->spare_disks
); d
++) {
206 if (d
>=0) dp
= &sb
->disks
[d
];
207 else dp
= &sb
->this_disk
;
208 snprintf(nb
, sizeof(nb
), "%4d", d
);
209 printf("%4s %5d %5d %5d %5d ", d
< 0 ? "this" : nb
,
210 dp
->number
, dp
->major
, dp
->minor
, dp
->raid_disk
);
211 wonly
= dp
->state
& (1<<MD_DISK_WRITEMOSTLY
);
212 dp
->state
&= ~(1<<MD_DISK_WRITEMOSTLY
);
213 if (dp
->state
& (1<<MD_DISK_FAULTY
)) printf(" faulty");
214 if (dp
->state
& (1<<MD_DISK_ACTIVE
)) printf(" active");
215 if (dp
->state
& (1<<MD_DISK_SYNC
)) printf(" sync");
216 if (dp
->state
& (1<<MD_DISK_REMOVED
)) printf(" removed");
217 if (wonly
) printf(" write-mostly");
218 if (dp
->state
== 0) printf(" spare");
219 if ((dv
=map_dev(dp
->major
, dp
->minor
, 0)))
222 if (d
== -1) printf("\n");
226 static void brief_examine_super0(void *sbv
)
228 mdp_super_t
*sb
= sbv
;
229 char *c
=map_num(pers
, sb
->level
);
231 printf("ARRAY %s level=%s num-devices=%d UUID=",
232 get_md_name(sb
->md_minor
),
233 c
?c
:"-unknown-", sb
->raid_disks
);
234 if (sb
->minor_version
>= 90)
235 printf("%08x:%08x:%08x:%08x", sb
->set_uuid0
, sb
->set_uuid1
,
236 sb
->set_uuid2
, sb
->set_uuid3
);
238 printf("%08x", sb
->set_uuid0
);
242 static void detail_super0(void *sbv
, char *homehost
)
244 mdp_super_t
*sb
= sbv
;
246 if (sb
->minor_version
>= 90)
247 printf("%08x:%08x:%08x:%08x", sb
->set_uuid0
, sb
->set_uuid1
,
248 sb
->set_uuid2
, sb
->set_uuid3
);
250 printf("%08x", sb
->set_uuid0
);
252 unsigned char *hash
= SHA1((unsigned char *)homehost
,
255 if (memcmp(&sb
->set_uuid2
, hash
, 8)==0)
256 printf(" (local to host %s)", homehost
);
258 printf("\n Events : %d.%d\n\n", sb
->events_hi
, sb
->events_lo
);
261 static void brief_detail_super0(void *sbv
)
263 mdp_super_t
*sb
= sbv
;
265 if (sb
->minor_version
>= 90)
266 printf("%08x:%08x:%08x:%08x", sb
->set_uuid0
, sb
->set_uuid1
,
267 sb
->set_uuid2
, sb
->set_uuid3
);
269 printf("%08x", sb
->set_uuid0
);
272 static void uuid_from_super0(int uuid
[4], void * sbv
)
274 mdp_super_t
*super
= sbv
;
275 uuid
[0] = super
->set_uuid0
;
276 if (super
->minor_version
>= 90) {
277 uuid
[1] = super
->set_uuid1
;
278 uuid
[2] = super
->set_uuid2
;
279 uuid
[3] = super
->set_uuid3
;
287 static void getinfo_super0(struct mdinfo
*info
, void *sbv
)
289 mdp_super_t
*sb
= sbv
;
293 info
->array
.major_version
= sb
->major_version
;
294 info
->array
.minor_version
= sb
->minor_version
;
295 info
->array
.patch_version
= sb
->patch_version
;
296 info
->array
.raid_disks
= sb
->raid_disks
;
297 info
->array
.level
= sb
->level
;
298 info
->array
.layout
= sb
->layout
;
299 info
->array
.md_minor
= sb
->md_minor
;
300 info
->array
.ctime
= sb
->ctime
;
301 info
->array
.utime
= sb
->utime
;
302 info
->array
.chunk_size
= sb
->chunk_size
;
303 info
->component_size
= sb
->size
*2;
305 info
->disk
.state
= sb
->this_disk
.state
;
306 info
->disk
.major
= sb
->this_disk
.major
;
307 info
->disk
.minor
= sb
->this_disk
.minor
;
308 info
->disk
.raid_disk
= sb
->this_disk
.raid_disk
;
309 info
->disk
.number
= sb
->this_disk
.number
;
311 info
->events
= md_event(sb
);
312 info
->data_offset
= 0;
314 uuid_from_super0(info
->uuid
, sbv
);
316 if (sb
->minor_version
> 90 && (sb
->reshape_position
+1) != 0) {
317 info
->reshape_active
= 1;
318 info
->reshape_progress
= sb
->reshape_position
;
319 info
->new_level
= sb
->new_level
;
320 info
->delta_disks
= sb
->delta_disks
;
321 info
->new_layout
= sb
->new_layout
;
322 info
->new_chunk
= sb
->new_chunk
;
324 info
->reshape_active
= 0;
327 /* work_disks is calculated rather than read directly */
328 for (i
=0; i
< MD_SB_DISKS
; i
++)
329 if ((sb
->disks
[i
].state
& (1<<MD_DISK_SYNC
)) &&
330 (sb
->disks
[i
].state
& (1<<MD_DISK_ACTIVE
)) &&
331 !(sb
->disks
[i
].state
& (1<<MD_DISK_FAULTY
)))
333 info
->array
.working_disks
= working
;
337 static int update_super0(struct mdinfo
*info
, void *sbv
, char *update
,
338 char *devname
, int verbose
,
339 int uuid_set
, char *homehost
)
341 /* NOTE: for 'assemble' and 'force' we need to return non-zero if any change was made.
342 * For others, the return value is ignored.
345 mdp_super_t
*sb
= sbv
;
346 if (strcmp(update
, "sparc2.2")==0 ) {
347 /* 2.2 sparc put the events in the wrong place
348 * So we copy the tail of the superblock
349 * up 4 bytes before continuing
351 __u32
*sb32
= (__u32
*)sb
;
352 memcpy(sb32
+MD_SB_GENERIC_CONSTANT_WORDS
+7,
353 sb32
+MD_SB_GENERIC_CONSTANT_WORDS
+7+1,
354 (MD_SB_WORDS
- (MD_SB_GENERIC_CONSTANT_WORDS
+7+1))*4);
356 fprintf (stderr
, Name
": adjusting superblock of %s for 2.2/sparc compatability.\n",
359 if (strcmp(update
, "super-minor") ==0) {
360 sb
->md_minor
= info
->array
.md_minor
;
362 fprintf(stderr
, Name
": updating superblock of %s with minor number %d\n",
363 devname
, info
->array
.md_minor
);
365 if (strcmp(update
, "summaries") == 0) {
367 /* set nr_disks, active_disks, working_disks,
368 * failed_disks, spare_disks based on disks[]
369 * array in superblock.
370 * Also make sure extra slots aren't 'failed'
372 sb
->nr_disks
= sb
->active_disks
=
373 sb
->working_disks
= sb
->failed_disks
=
375 for (i
=0; i
< MD_SB_DISKS
; i
++)
376 if (sb
->disks
[i
].major
||
377 sb
->disks
[i
].minor
) {
378 int state
= sb
->disks
[i
].state
;
379 if (state
& (1<<MD_DISK_REMOVED
))
382 if (state
& (1<<MD_DISK_ACTIVE
))
384 if (state
& (1<<MD_DISK_FAULTY
))
390 } else if (i
>= sb
->raid_disks
&& sb
->disks
[i
].number
== 0)
391 sb
->disks
[i
].state
= 0;
393 if (strcmp(update
, "force")==0) {
394 __u32 ehi
= sb
->events_hi
, elo
= sb
->events_lo
;
395 sb
->events_hi
= (info
->events
>>32) & 0xFFFFFFFF;
396 sb
->events_lo
= (info
->events
) & 0xFFFFFFFF;
397 if (sb
->events_hi
!= ehi
||
398 sb
->events_lo
!= elo
)
400 if ((sb
->level
== 5 || sb
->level
== 4 || sb
->level
== 6) &&
401 (sb
->state
& (1 << MD_SB_CLEAN
)) == 0) {
402 /* need to force clean */
403 sb
->state
|= (1 << MD_SB_CLEAN
);
407 if (strcmp(update
, "assemble")==0) {
408 int d
= info
->disk
.number
;
409 int wonly
= sb
->disks
[d
].state
& (1<<MD_DISK_WRITEMOSTLY
);
410 if ((sb
->disks
[d
].state
& ~(1<<MD_DISK_WRITEMOSTLY
))
411 != info
->disk
.state
) {
412 sb
->disks
[d
].state
= info
->disk
.state
| wonly
;
416 if (strcmp(update
, "newdev") == 0) {
417 int d
= info
->disk
.number
;
418 memset(&sb
->disks
[d
], 0, sizeof(sb
->disks
[d
]));
419 sb
->disks
[d
].number
= d
;
420 sb
->disks
[d
].major
= info
->disk
.major
;
421 sb
->disks
[d
].minor
= info
->disk
.minor
;
422 sb
->disks
[d
].raid_disk
= info
->disk
.raid_disk
;
423 sb
->disks
[d
].state
= info
->disk
.state
;
424 sb
->this_disk
= sb
->disks
[d
];
426 if (strcmp(update
, "grow") == 0) {
427 sb
->raid_disks
= info
->array
.raid_disks
;
428 sb
->nr_disks
= info
->array
.nr_disks
;
429 sb
->active_disks
= info
->array
.active_disks
;
430 sb
->working_disks
= info
->array
.working_disks
;
431 memset(&sb
->disks
[info
->disk
.number
], 0, sizeof(sb
->disks
[0]));
432 sb
->disks
[info
->disk
.number
].number
= info
->disk
.number
;
433 sb
->disks
[info
->disk
.number
].major
= info
->disk
.major
;
434 sb
->disks
[info
->disk
.number
].minor
= info
->disk
.minor
;
435 sb
->disks
[info
->disk
.number
].raid_disk
= info
->disk
.raid_disk
;
436 sb
->disks
[info
->disk
.number
].state
= info
->disk
.state
;
437 if (sb
->this_disk
.number
== info
->disk
.number
)
438 sb
->this_disk
= sb
->disks
[info
->disk
.number
];
440 if (strcmp(update
, "resync") == 0) {
441 /* make sure resync happens */
442 sb
->state
&= ~(1<<MD_SB_CLEAN
);
445 if (strcmp(update
, "homehost") == 0 &&
449 info
->uuid
[0] = sb
->set_uuid0
;
450 info
->uuid
[1] = sb
->set_uuid1
;
452 if (strcmp(update
, "uuid") == 0) {
453 if (!uuid_set
&& homehost
) {
454 unsigned char *hash
= SHA1((unsigned char*)homehost
,
457 memcpy(info
->uuid
+2, hash
, 8);
459 sb
->set_uuid0
= info
->uuid
[0];
460 sb
->set_uuid1
= info
->uuid
[1];
461 sb
->set_uuid2
= info
->uuid
[2];
462 sb
->set_uuid3
= info
->uuid
[3];
463 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
464 struct bitmap_super_s
*bm
;
465 bm
= (struct bitmap_super_s
*)(sb
+1);
466 uuid_from_super0((int*)bm
->uuid
, sbv
);
469 if (strcmp(update
, "_reshape_progress")==0)
470 sb
->reshape_position
= info
->reshape_progress
;
472 sb
->sb_csum
= calc_sb0_csum(sb
);
476 static __u64
event_super0(void *sbv
)
478 mdp_super_t
*sb
= sbv
;
483 * For verion-0 superblock, the homehost is 'stored' in the
484 * uuid. 8 bytes for a hash of the host leaving 8 bytes
485 * of random material.
486 * We use the first 8 bytes (64bits) of the sha1 of the
491 static int init_super0(struct supertype
*st
, void **sbp
, mdu_array_info_t
*info
,
492 unsigned long long size
, char *ignored_name
, char *homehost
)
494 mdp_super_t
*sb
= malloc(MD_SB_BYTES
+ sizeof(bitmap_super_t
));
497 memset(sb
, 0, MD_SB_BYTES
+ sizeof(bitmap_super_t
));
499 if (info
->major_version
== -1) {
500 /* zeroing the superblock */
505 spares
= info
->working_disks
- info
->active_disks
;
506 if (info
->raid_disks
+ spares
> MD_SB_DISKS
) {
507 fprintf(stderr
, Name
": too many devices requested: %d+%d > %d\n",
508 info
->raid_disks
, spares
, MD_SB_DISKS
);
512 rfd
= open("/dev/urandom", O_RDONLY
);
513 sb
->md_magic
= MD_SB_MAGIC
;
514 sb
->major_version
= 0;
515 sb
->minor_version
= 90;
516 sb
->patch_version
= 0;
517 sb
->gvalid_words
= 0; /* ignored */
518 if (rfd
< 0 || read(rfd
, &sb
->set_uuid0
, 4) != 4)
519 sb
->set_uuid0
= random();
521 sb
->level
= info
->level
;
522 if (size
!= info
->size
)
524 sb
->size
= info
->size
;
525 sb
->nr_disks
= info
->nr_disks
;
526 sb
->raid_disks
= info
->raid_disks
;
527 sb
->md_minor
= info
->md_minor
;
528 sb
->not_persistent
= 0;
529 if (rfd
< 0 || read(rfd
, &sb
->set_uuid1
, 12) != 12) {
530 sb
->set_uuid1
= random();
531 sb
->set_uuid2
= random();
532 sb
->set_uuid3
= random();
537 unsigned char *hash
= SHA1((unsigned char*)homehost
,
540 memcpy(&sb
->set_uuid2
, hash
, 8);
543 sb
->utime
= sb
->ctime
;
544 sb
->state
= info
->state
;
545 sb
->active_disks
= info
->active_disks
;
546 sb
->working_disks
= info
->working_disks
;
547 sb
->failed_disks
= info
->failed_disks
;
548 sb
->spare_disks
= info
->spare_disks
;
552 sb
->layout
= info
->layout
;
553 sb
->chunk_size
= info
->chunk_size
;
559 /* Add a device to the superblock being created */
560 static void add_to_super0(void *sbv
, mdu_disk_info_t
*dinfo
)
562 mdp_super_t
*sb
= sbv
;
563 mdp_disk_t
*dk
= &sb
->disks
[dinfo
->number
];
565 dk
->number
= dinfo
->number
;
566 dk
->major
= dinfo
->major
;
567 dk
->minor
= dinfo
->minor
;
568 dk
->raid_disk
= dinfo
->raid_disk
;
569 dk
->state
= dinfo
->state
;
572 static int store_super0(struct supertype
*st
, int fd
, void *sbv
)
575 unsigned long long dsize
;
576 unsigned long long offset
;
577 mdp_super_t
*super
= sbv
;
580 if (ioctl(fd
, BLKGETSIZE64
, &dsize
) != 0)
583 if (ioctl(fd
, BLKGETSIZE
, &size
))
586 dsize
= ((unsigned long long)size
)<<9;
589 if (dsize
< MD_RESERVED_SECTORS
*2*512)
592 offset
= MD_NEW_SIZE_SECTORS(dsize
>>9);
596 if (lseek64(fd
, offset
, 0)< 0LL)
599 if (write(fd
, super
, sizeof(*super
)) != sizeof(*super
))
602 if (super
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
603 struct bitmap_super_s
* bm
= (struct bitmap_super_s
*)(super
+1);
604 if (__le32_to_cpu(bm
->magic
) == BITMAP_MAGIC
)
605 write(fd
, bm
, sizeof(*bm
));
612 static int write_init_super0(struct supertype
*st
, void *sbv
, mdu_disk_info_t
*dinfo
, char *devname
)
614 mdp_super_t
*sb
= sbv
;
615 int fd
= open(devname
, O_RDWR
|O_EXCL
);
619 fprintf(stderr
, Name
": Failed to open %s to write superblock\n", devname
);
623 sb
->disks
[dinfo
->number
].state
&= ~(1<<MD_DISK_FAULTY
);
624 sb
->disks
[dinfo
->number
].state
|= (1<<MD_DISK_SYNC
);
626 sb
->this_disk
= sb
->disks
[dinfo
->number
];
627 sb
->sb_csum
= calc_sb0_csum(sb
);
628 rv
= store_super0(st
, fd
, sb
);
630 if (rv
== 0 && (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
)))
631 rv
= st
->ss
->write_bitmap(st
, fd
, sbv
);
635 fprintf(stderr
, Name
": failed to write superblock to %s\n", devname
);
639 static int compare_super0(void **firstp
, void *secondv
)
643 * 0 same, or first was empty, and second was copied
644 * 1 second had wrong number
648 mdp_super_t
*first
= *firstp
;
649 mdp_super_t
*second
= secondv
;
651 int uuid1
[4], uuid2
[4];
652 if (second
->md_magic
!= MD_SB_MAGIC
)
655 first
= malloc(MD_SB_BYTES
+ sizeof(struct bitmap_super_s
));
656 memcpy(first
, second
, MD_SB_BYTES
+ sizeof(struct bitmap_super_s
));
661 uuid_from_super0(uuid1
, first
);
662 uuid_from_super0(uuid2
, second
);
663 if (!same_uuid(uuid1
, uuid2
, 0))
665 if (first
->major_version
!= second
->major_version
||
666 first
->minor_version
!= second
->minor_version
||
667 first
->patch_version
!= second
->patch_version
||
668 first
->gvalid_words
!= second
->gvalid_words
||
669 first
->ctime
!= second
->ctime
||
670 first
->level
!= second
->level
||
671 first
->size
!= second
->size
||
672 first
->raid_disks
!= second
->raid_disks
)
679 static int load_super0(struct supertype
*st
, int fd
, void **sbp
, char *devname
)
681 /* try to read in the superblock
684 * 1 on cannot get superblock
685 * 2 on superblock meaningless
688 unsigned long long dsize
;
689 unsigned long long offset
;
692 struct bitmap_super_s
*bsb
;
695 if (ioctl(fd
, BLKGETSIZE64
, &dsize
) != 0)
698 if (ioctl(fd
, BLKGETSIZE
, &size
)) {
700 fprintf(stderr
, Name
": cannot find device size for %s: %s\n",
701 devname
, strerror(errno
));
707 if (dsize
< MD_RESERVED_SECTORS
*2) {
709 fprintf(stderr
, Name
": %s is too small for md: size is %ld sectors.\n",
714 offset
= MD_NEW_SIZE_SECTORS(dsize
>>9);
718 ioctl(fd
, BLKFLSBUF
, 0); /* make sure we read current data */
720 if (lseek64(fd
, offset
, 0)< 0LL) {
722 fprintf(stderr
, Name
": Cannot seek to superblock on %s: %s\n",
723 devname
, strerror(errno
));
727 super
= malloc(MD_SB_BYTES
+ sizeof(bitmap_super_t
));
729 if (read(fd
, super
, sizeof(*super
)) != MD_SB_BYTES
) {
731 fprintf(stderr
, Name
": Cannot read superblock on %s\n",
737 if (st
->ss
&& st
->minor_version
== 9)
738 super0_swap_endian(super
);
740 if (super
->md_magic
!= MD_SB_MAGIC
) {
742 fprintf(stderr
, Name
": No super block found on %s (Expected magic %08x, got %08x)\n",
743 devname
, MD_SB_MAGIC
, super
->md_magic
);
748 if (super
->major_version
!= 0) {
750 fprintf(stderr
, Name
": Cannot interpret superblock on %s - version is %d\n",
751 devname
, super
->major_version
);
756 if (st
->ss
== NULL
) {
758 st
->minor_version
= 90;
759 st
->max_devs
= MD_SB_DISKS
;
762 /* Now check on the bitmap superblock */
763 if ((super
->state
& (1<<MD_SB_BITMAP_PRESENT
)) == 0)
765 /* Read the bitmap superblock and make sure it looks
766 * valid. If it doesn't clear the bit. An --assemble --force
767 * should get that written out.
769 if (read(fd
, super
+1, sizeof(struct bitmap_super_s
))
770 != sizeof(struct bitmap_super_s
))
773 uuid_from_super0(uuid
, super
);
774 bsb
= (struct bitmap_super_s
*)(super
+1);
775 if (__le32_to_cpu(bsb
->magic
) != BITMAP_MAGIC
||
776 memcmp(bsb
->uuid
, uuid
, 16) != 0)
781 super
->state
&= ~(1<<MD_SB_BITMAP_PRESENT
);
786 static struct supertype
*match_metadata_desc0(char *arg
)
788 struct supertype
*st
= malloc(sizeof(*st
));
792 st
->minor_version
= 90;
793 st
->max_devs
= MD_SB_DISKS
;
794 if (strcmp(arg
, "0") == 0 ||
795 strcmp(arg
, "0.90") == 0 ||
796 strcmp(arg
, "default") == 0
800 st
->minor_version
= 9; /* flag for 'byte-swapped' */
801 if (strcmp(arg
, "0.swap")==0)
808 static __u64
avail_size0(struct supertype
*st
, __u64 devsize
)
810 if (devsize
< MD_RESERVED_SECTORS
*2)
812 return MD_NEW_SIZE_SECTORS(devsize
);
815 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
)
818 * The bitmap comes immediately after the superblock and must be 60K in size
819 * at most. The default size is between 30K and 60K
821 * size is in sectors, chunk is in bytes !!!
823 unsigned long long bits
;
824 unsigned long long max_bits
= 60*1024*8;
825 unsigned long long min_chunk
;
826 mdp_super_t
*sb
= sbv
;
827 bitmap_super_t
*bms
= (bitmap_super_t
*)(((char*)sb
) + MD_SB_BYTES
);
830 min_chunk
= 4096; /* sub-page chunks don't work yet.. */
831 bits
= (size
* 512) / min_chunk
+ 1;
832 while (bits
> max_bits
) {
838 else if (chunk
< min_chunk
)
839 return 0; /* chunk size too small */
841 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
843 memset(bms
, 0, sizeof(*bms
));
844 bms
->magic
= __cpu_to_le32(BITMAP_MAGIC
);
845 bms
->version
= __cpu_to_le32(major
);
846 uuid_from_super0((int*)bms
->uuid
, sb
);
847 bms
->chunksize
= __cpu_to_le32(chunk
);
848 bms
->daemon_sleep
= __cpu_to_le32(delay
);
849 bms
->sync_size
= __cpu_to_le64(size
);
850 bms
->write_behind
= __cpu_to_le32(write_behind
);
856 void locate_bitmap0(struct supertype
*st
, int fd
, void *sbv
)
858 unsigned long long dsize
;
860 unsigned long long offset
;
862 if (ioctl(fd
, BLKGETSIZE64
, &dsize
) != 0)
865 if (ioctl(fd
, BLKGETSIZE
, &size
))
868 dsize
= ((unsigned long long)size
)<<9;
871 if (dsize
< MD_RESERVED_SECTORS
*2)
874 offset
= MD_NEW_SIZE_SECTORS(dsize
>>9);
878 offset
+= MD_SB_BYTES
;
880 lseek64(fd
, offset
, 0);
883 int write_bitmap0(struct supertype
*st
, int fd
, void *sbv
)
886 unsigned long long dsize
;
887 unsigned long long offset
;
888 mdp_super_t
*sb
= sbv
;
896 if (ioctl(fd
, BLKGETSIZE64
, &dsize
) != 0)
899 if (ioctl(fd
, BLKGETSIZE
, &size
))
902 dsize
= ((unsigned long long)size
)<<9;
905 if (dsize
< MD_RESERVED_SECTORS
*2)
908 offset
= MD_NEW_SIZE_SECTORS(dsize
>>9);
912 if (lseek64(fd
, offset
+ 4096, 0)< 0LL)
916 if (write(fd
, ((char*)sb
)+MD_SB_BYTES
, sizeof(bitmap_super_t
)) !=
917 sizeof(bitmap_super_t
))
919 towrite
= 64*1024 - MD_SB_BYTES
- sizeof(bitmap_super_t
);
920 memset(buf
, 0xff, sizeof(buf
));
921 while (towrite
> 0) {
925 n
= write(fd
, buf
, n
);
938 struct superswitch super0
= {
940 .examine_super
= examine_super0
,
941 .brief_examine_super
= brief_examine_super0
,
942 .detail_super
= detail_super0
,
943 .brief_detail_super
= brief_detail_super0
,
945 .uuid_from_super
= uuid_from_super0
,
946 .getinfo_super
= getinfo_super0
,
947 .update_super
= update_super0
,
948 .event_super
= event_super0
,
949 .init_super
= init_super0
,
950 .add_to_super
= add_to_super0
,
951 .store_super
= store_super0
,
952 .write_init_super
= write_init_super0
,
953 .compare_super
= compare_super0
,
954 .load_super
= load_super0
,
955 .match_metadata_desc
= match_metadata_desc0
,
956 .avail_size
= avail_size0
,
957 .add_internal_bitmap
= add_internal_bitmap0
,
958 .locate_bitmap
= locate_bitmap0
,
959 .write_bitmap
= write_bitmap0
,