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(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
);
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) {
119 printf(" Used Dev Size : %d%s\n", sb
->size
,
120 human_size((long long)sb
->size
<<10));
122 case 1: ddsks
=1;break;
124 case 5: ddsks
= sb
->raid_disks
-1; break;
125 case 6: ddsks
= sb
->raid_disks
-2; break;
126 case 10: ddsks
= sb
->raid_disks
/ (sb
->layout
&255) / ((sb
->layout
>>8)&255);
129 printf(" Array Size : %llu%s\n", (unsigned long long)ddsks
* sb
->size
,
130 human_size(ddsks
*(long long)sb
->size
<<10));
132 printf(" Raid Devices : %d\n", sb
->raid_disks
);
133 printf(" Total Devices : %d\n", sb
->nr_disks
);
134 printf("Preferred Minor : %d\n", sb
->md_minor
);
136 if (sb
->minor_version
> 90 && (sb
->reshape_position
+1) != 0) {
137 printf(" Reshape pos'n : %llu%s\n", (unsigned long long)sb
->reshape_position
/2, human_size((long long)sb
->reshape_position
<<9));
138 if (sb
->delta_disks
) {
139 printf(" Delta Devices : %d", sb
->delta_disks
);
141 printf(" (%d->%d)\n", sb
->raid_disks
-sb
->delta_disks
, sb
->raid_disks
);
143 printf(" (%d->%d)\n", sb
->raid_disks
, sb
->raid_disks
+sb
->delta_disks
);
145 if (sb
->new_level
!= sb
->level
) {
146 c
= map_num(pers
, sb
->new_level
);
147 printf(" New Level : %s\n", c
?c
:"-unknown-");
149 if (sb
->new_layout
!= sb
->layout
) {
150 if (sb
->level
== 5) {
151 c
= map_num(r5layout
, sb
->new_layout
);
152 printf(" New Layout : %s\n", c
?c
:"-unknown-");
154 if (sb
->level
== 10) {
155 printf(" New Layout : near=%d, %s=%d\n",
157 (sb
->new_layout
&0x10000)?"offset":"far",
158 (sb
->new_layout
>>8)&255);
161 if (sb
->new_chunk
!= sb
->chunk_size
)
162 printf(" New Chunksize : %d\n", sb
->new_chunk
);
166 printf(" Update Time : %.24s\n", ctime(&atime
));
167 printf(" State : %s\n",
168 (sb
->state
&(1<<MD_SB_CLEAN
))?"clean":"active");
169 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
))
170 printf("Internal Bitmap : present\n");
171 printf(" Active Devices : %d\n", sb
->active_disks
);
172 printf("Working Devices : %d\n", sb
->working_disks
);
173 printf(" Failed Devices : %d\n", sb
->failed_disks
);
174 printf(" Spare Devices : %d\n", sb
->spare_disks
);
175 if (calc_sb0_csum(sb
) == sb
->sb_csum
)
176 printf(" Checksum : %x - correct\n", sb
->sb_csum
);
178 printf(" Checksum : %x - expected %lx\n", sb
->sb_csum
, calc_sb0_csum(sb
));
179 printf(" Events : %d.%d\n", sb
->events_hi
, sb
->events_lo
);
181 if (sb
->level
== 5) {
182 c
= map_num(r5layout
, sb
->layout
);
183 printf(" Layout : %s\n", c
?c
:"-unknown-");
185 if (sb
->level
== 10) {
186 printf(" Layout : near=%d, %s=%d\n",
188 (sb
->layout
&0x10000)?"offset":"far",
189 (sb
->layout
>>8)&255);
197 printf(" Chunk Size : %dK\n", sb
->chunk_size
/1024);
200 printf(" Rounding : %dK\n", sb
->chunk_size
/1024);
205 printf(" Number Major Minor RaidDevice State\n");
206 for (d
= -1; d
<(signed int)(sb
->raid_disks
+sb
->spare_disks
); d
++) {
211 if (d
>=0) dp
= &sb
->disks
[d
];
212 else dp
= &sb
->this_disk
;
213 snprintf(nb
, sizeof(nb
), "%4d", d
);
214 printf("%4s %5d %5d %5d %5d ", d
< 0 ? "this" : nb
,
215 dp
->number
, dp
->major
, dp
->minor
, dp
->raid_disk
);
216 wonly
= dp
->state
& (1<<MD_DISK_WRITEMOSTLY
);
217 dp
->state
&= ~(1<<MD_DISK_WRITEMOSTLY
);
218 if (dp
->state
& (1<<MD_DISK_FAULTY
)) printf(" faulty");
219 if (dp
->state
& (1<<MD_DISK_ACTIVE
)) printf(" active");
220 if (dp
->state
& (1<<MD_DISK_SYNC
)) printf(" sync");
221 if (dp
->state
& (1<<MD_DISK_REMOVED
)) printf(" removed");
222 if (wonly
) printf(" write-mostly");
223 if (dp
->state
== 0) printf(" spare");
224 if ((dv
=map_dev(dp
->major
, dp
->minor
, 0)))
227 if (d
== -1) printf("\n");
231 static void brief_examine_super0(void *sbv
)
233 mdp_super_t
*sb
= sbv
;
234 char *c
=map_num(pers
, sb
->level
);
237 sprintf(devname
, "/dev/md%d", sb
->md_minor
);
239 printf("ARRAY %s level=%s num-devices=%d UUID=",
241 c
?c
:"-unknown-", sb
->raid_disks
);
242 if (sb
->minor_version
>= 90)
243 printf("%08x:%08x:%08x:%08x", sb
->set_uuid0
, sb
->set_uuid1
,
244 sb
->set_uuid2
, sb
->set_uuid3
);
246 printf("%08x", sb
->set_uuid0
);
250 static void detail_super0(void *sbv
, char *homehost
)
252 mdp_super_t
*sb
= sbv
;
254 if (sb
->minor_version
>= 90)
255 printf("%08x:%08x:%08x:%08x", sb
->set_uuid0
, sb
->set_uuid1
,
256 sb
->set_uuid2
, sb
->set_uuid3
);
258 printf("%08x", sb
->set_uuid0
);
261 void *hash
= sha1_buffer(homehost
,
264 if (memcmp(&sb
->set_uuid2
, hash
, 8)==0)
265 printf(" (local to host %s)", homehost
);
267 printf("\n Events : %d.%d\n\n", sb
->events_hi
, sb
->events_lo
);
270 static void brief_detail_super0(void *sbv
)
272 mdp_super_t
*sb
= sbv
;
274 if (sb
->minor_version
>= 90)
275 printf("%08x:%08x:%08x:%08x", sb
->set_uuid0
, sb
->set_uuid1
,
276 sb
->set_uuid2
, sb
->set_uuid3
);
278 printf("%08x", sb
->set_uuid0
);
282 static int match_home0(void *sbv
, char *homehost
)
284 mdp_super_t
*sb
= sbv
;
286 char *hash
= sha1_buffer(homehost
,
290 return (memcmp(&sb
->set_uuid2
, hash
, 8)==0);
293 static void uuid_from_super0(int uuid
[4], void * sbv
)
295 mdp_super_t
*super
= sbv
;
296 uuid
[0] = super
->set_uuid0
;
297 if (super
->minor_version
>= 90) {
298 uuid
[1] = super
->set_uuid1
;
299 uuid
[2] = super
->set_uuid2
;
300 uuid
[3] = super
->set_uuid3
;
308 static void getinfo_super0(struct mdinfo
*info
, void *sbv
)
310 mdp_super_t
*sb
= sbv
;
314 info
->array
.major_version
= sb
->major_version
;
315 info
->array
.minor_version
= sb
->minor_version
;
316 info
->array
.patch_version
= sb
->patch_version
;
317 info
->array
.raid_disks
= sb
->raid_disks
;
318 info
->array
.level
= sb
->level
;
319 info
->array
.layout
= sb
->layout
;
320 info
->array
.md_minor
= sb
->md_minor
;
321 info
->array
.ctime
= sb
->ctime
;
322 info
->array
.utime
= sb
->utime
;
323 info
->array
.chunk_size
= sb
->chunk_size
;
324 info
->array
.state
= sb
->state
;
325 info
->component_size
= sb
->size
*2;
327 info
->disk
.state
= sb
->this_disk
.state
;
328 info
->disk
.major
= sb
->this_disk
.major
;
329 info
->disk
.minor
= sb
->this_disk
.minor
;
330 info
->disk
.raid_disk
= sb
->this_disk
.raid_disk
;
331 info
->disk
.number
= sb
->this_disk
.number
;
333 info
->events
= md_event(sb
);
334 info
->data_offset
= 0;
336 uuid_from_super0(info
->uuid
, sbv
);
338 if (sb
->minor_version
> 90 && (sb
->reshape_position
+1) != 0) {
339 info
->reshape_active
= 1;
340 info
->reshape_progress
= sb
->reshape_position
;
341 info
->new_level
= sb
->new_level
;
342 info
->delta_disks
= sb
->delta_disks
;
343 info
->new_layout
= sb
->new_layout
;
344 info
->new_chunk
= sb
->new_chunk
;
346 info
->reshape_active
= 0;
348 sprintf(info
->name
, "%d", sb
->md_minor
);
349 /* work_disks is calculated rather than read directly */
350 for (i
=0; i
< MD_SB_DISKS
; i
++)
351 if ((sb
->disks
[i
].state
& (1<<MD_DISK_SYNC
)) &&
352 (sb
->disks
[i
].raid_disk
< info
->array
.raid_disks
) &&
353 (sb
->disks
[i
].state
& (1<<MD_DISK_ACTIVE
)) &&
354 !(sb
->disks
[i
].state
& (1<<MD_DISK_FAULTY
)))
356 info
->array
.working_disks
= working
;
360 static int update_super0(struct mdinfo
*info
, void *sbv
, char *update
,
361 char *devname
, int verbose
,
362 int uuid_set
, char *homehost
)
364 /* NOTE: for 'assemble' and 'force' we need to return non-zero if any change was made.
365 * For others, the return value is ignored.
368 mdp_super_t
*sb
= sbv
;
369 if (strcmp(update
, "sparc2.2")==0 ) {
370 /* 2.2 sparc put the events in the wrong place
371 * So we copy the tail of the superblock
372 * up 4 bytes before continuing
374 __u32
*sb32
= (__u32
*)sb
;
375 memcpy(sb32
+MD_SB_GENERIC_CONSTANT_WORDS
+7,
376 sb32
+MD_SB_GENERIC_CONSTANT_WORDS
+7+1,
377 (MD_SB_WORDS
- (MD_SB_GENERIC_CONSTANT_WORDS
+7+1))*4);
379 fprintf (stderr
, Name
": adjusting superblock of %s for 2.2/sparc compatability.\n",
382 if (strcmp(update
, "super-minor") ==0) {
383 sb
->md_minor
= info
->array
.md_minor
;
385 fprintf(stderr
, Name
": updating superblock of %s with minor number %d\n",
386 devname
, info
->array
.md_minor
);
388 if (strcmp(update
, "summaries") == 0) {
390 /* set nr_disks, active_disks, working_disks,
391 * failed_disks, spare_disks based on disks[]
392 * array in superblock.
393 * Also make sure extra slots aren't 'failed'
395 sb
->nr_disks
= sb
->active_disks
=
396 sb
->working_disks
= sb
->failed_disks
=
398 for (i
=0; i
< MD_SB_DISKS
; i
++)
399 if (sb
->disks
[i
].major
||
400 sb
->disks
[i
].minor
) {
401 int state
= sb
->disks
[i
].state
;
402 if (state
& (1<<MD_DISK_REMOVED
))
405 if (state
& (1<<MD_DISK_ACTIVE
))
407 if (state
& (1<<MD_DISK_FAULTY
))
413 } else if (i
>= sb
->raid_disks
&& sb
->disks
[i
].number
== 0)
414 sb
->disks
[i
].state
= 0;
416 if (strcmp(update
, "force-one")==0) {
417 /* Not enough devices for a working array, so
418 * bring this one up-to-date.
420 __u32 ehi
= sb
->events_hi
, elo
= sb
->events_lo
;
421 sb
->events_hi
= (info
->events
>>32) & 0xFFFFFFFF;
422 sb
->events_lo
= (info
->events
) & 0xFFFFFFFF;
423 if (sb
->events_hi
!= ehi
||
424 sb
->events_lo
!= elo
)
427 if (strcmp(update
, "force-array")==0) {
428 /* degraded array and 'force' requested, so
429 * maybe need to mark it 'clean'
431 if ((sb
->level
== 5 || sb
->level
== 4 || sb
->level
== 6) &&
432 (sb
->state
& (1 << MD_SB_CLEAN
)) == 0) {
433 /* need to force clean */
434 sb
->state
|= (1 << MD_SB_CLEAN
);
438 if (strcmp(update
, "assemble")==0) {
439 int d
= info
->disk
.number
;
440 int wonly
= sb
->disks
[d
].state
& (1<<MD_DISK_WRITEMOSTLY
);
441 if ((sb
->disks
[d
].state
& ~(1<<MD_DISK_WRITEMOSTLY
))
442 != info
->disk
.state
) {
443 sb
->disks
[d
].state
= info
->disk
.state
| wonly
;
447 if (strcmp(update
, "grow") == 0) {
448 sb
->raid_disks
= info
->array
.raid_disks
;
449 sb
->nr_disks
= info
->array
.nr_disks
;
450 sb
->active_disks
= info
->array
.active_disks
;
451 sb
->working_disks
= info
->array
.working_disks
;
452 memset(&sb
->disks
[info
->disk
.number
], 0, sizeof(sb
->disks
[0]));
453 sb
->disks
[info
->disk
.number
].number
= info
->disk
.number
;
454 sb
->disks
[info
->disk
.number
].major
= info
->disk
.major
;
455 sb
->disks
[info
->disk
.number
].minor
= info
->disk
.minor
;
456 sb
->disks
[info
->disk
.number
].raid_disk
= info
->disk
.raid_disk
;
457 sb
->disks
[info
->disk
.number
].state
= info
->disk
.state
;
458 if (sb
->this_disk
.number
== info
->disk
.number
)
459 sb
->this_disk
= sb
->disks
[info
->disk
.number
];
461 if (strcmp(update
, "resync") == 0) {
462 /* make sure resync happens */
463 sb
->state
&= ~(1<<MD_SB_CLEAN
);
466 if (strcmp(update
, "homehost") == 0 &&
470 info
->uuid
[0] = sb
->set_uuid0
;
471 info
->uuid
[1] = sb
->set_uuid1
;
473 if (strcmp(update
, "uuid") == 0) {
474 if (!uuid_set
&& homehost
) {
476 char *hash
= sha1_buffer(homehost
,
479 memcpy(info
->uuid
+2, hash
, 8);
481 sb
->set_uuid0
= info
->uuid
[0];
482 sb
->set_uuid1
= info
->uuid
[1];
483 sb
->set_uuid2
= info
->uuid
[2];
484 sb
->set_uuid3
= info
->uuid
[3];
485 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
486 struct bitmap_super_s
*bm
;
487 bm
= (struct bitmap_super_s
*)(sb
+1);
488 uuid_from_super0((int*)bm
->uuid
, sbv
);
491 if (strcmp(update
, "_reshape_progress")==0)
492 sb
->reshape_position
= info
->reshape_progress
;
494 sb
->sb_csum
= calc_sb0_csum(sb
);
499 * For verion-0 superblock, the homehost is 'stored' in the
500 * uuid. 8 bytes for a hash of the host leaving 8 bytes
501 * of random material.
502 * We use the first 8 bytes (64bits) of the sha1 of the
507 static int init_super0(struct supertype
*st
, void **sbp
, mdu_array_info_t
*info
,
508 unsigned long long size
, char *ignored_name
, char *homehost
,
511 mdp_super_t
*sb
= malloc(MD_SB_BYTES
+ sizeof(bitmap_super_t
));
513 memset(sb
, 0, MD_SB_BYTES
+ sizeof(bitmap_super_t
));
515 if (info
->major_version
== -1) {
516 /* zeroing the superblock */
521 spares
= info
->working_disks
- info
->active_disks
;
522 if (info
->raid_disks
+ spares
> MD_SB_DISKS
) {
523 fprintf(stderr
, Name
": too many devices requested: %d+%d > %d\n",
524 info
->raid_disks
, spares
, MD_SB_DISKS
);
528 sb
->md_magic
= MD_SB_MAGIC
;
529 sb
->major_version
= 0;
530 sb
->minor_version
= 90;
531 sb
->patch_version
= 0;
532 sb
->gvalid_words
= 0; /* ignored */
534 sb
->level
= info
->level
;
535 if (size
!= info
->size
)
537 sb
->size
= info
->size
;
538 sb
->nr_disks
= info
->nr_disks
;
539 sb
->raid_disks
= info
->raid_disks
;
540 sb
->md_minor
= info
->md_minor
;
541 sb
->not_persistent
= 0;
543 sb
->set_uuid0
= uuid
[0];
544 sb
->set_uuid1
= uuid
[1];
545 sb
->set_uuid2
= uuid
[2];
546 sb
->set_uuid3
= uuid
[3];
548 int rfd
= open("/dev/urandom", O_RDONLY
);
549 if (rfd
< 0 || read(rfd
, &sb
->set_uuid0
, 4) != 4)
550 sb
->set_uuid0
= random();
551 if (rfd
< 0 || read(rfd
, &sb
->set_uuid1
, 12) != 12) {
552 sb
->set_uuid1
= random();
553 sb
->set_uuid2
= random();
554 sb
->set_uuid3
= random();
561 char *hash
= sha1_buffer(homehost
,
564 memcpy(&sb
->set_uuid2
, hash
, 8);
567 sb
->utime
= sb
->ctime
;
568 sb
->state
= info
->state
;
569 sb
->active_disks
= info
->active_disks
;
570 sb
->working_disks
= info
->working_disks
;
571 sb
->failed_disks
= info
->failed_disks
;
572 sb
->spare_disks
= info
->spare_disks
;
576 sb
->layout
= info
->layout
;
577 sb
->chunk_size
= info
->chunk_size
;
583 /* Add a device to the superblock being created */
584 static void add_to_super0(void *sbv
, mdu_disk_info_t
*dinfo
)
586 mdp_super_t
*sb
= sbv
;
587 mdp_disk_t
*dk
= &sb
->disks
[dinfo
->number
];
589 dk
->number
= dinfo
->number
;
590 dk
->major
= dinfo
->major
;
591 dk
->minor
= dinfo
->minor
;
592 dk
->raid_disk
= dinfo
->raid_disk
;
593 dk
->state
= dinfo
->state
;
596 static int store_super0(struct supertype
*st
, int fd
, void *sbv
)
598 unsigned long long dsize
;
599 unsigned long long offset
;
600 mdp_super_t
*super
= sbv
;
602 if (!get_dev_size(fd
, NULL
, &dsize
))
605 if (dsize
< MD_RESERVED_SECTORS
*2*512)
608 offset
= MD_NEW_SIZE_SECTORS(dsize
>>9);
612 if (lseek64(fd
, offset
, 0)< 0LL)
615 if (write(fd
, super
, sizeof(*super
)) != sizeof(*super
))
618 if (super
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
619 struct bitmap_super_s
* bm
= (struct bitmap_super_s
*)(super
+1);
620 if (__le32_to_cpu(bm
->magic
) == BITMAP_MAGIC
)
621 if (write(fd
, bm
, sizeof(*bm
)) != sizeof(*bm
))
629 static int write_init_super0(struct supertype
*st
, void *sbv
, mdu_disk_info_t
*dinfo
, char *devname
)
631 mdp_super_t
*sb
= sbv
;
632 int fd
= open(devname
, O_RDWR
|O_EXCL
);
636 fprintf(stderr
, Name
": Failed to open %s to write superblock\n", devname
);
640 sb
->disks
[dinfo
->number
].state
&= ~(1<<MD_DISK_FAULTY
);
642 sb
->this_disk
= sb
->disks
[dinfo
->number
];
643 sb
->sb_csum
= calc_sb0_csum(sb
);
644 rv
= store_super0(st
, fd
, sb
);
646 if (rv
== 0 && (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
)))
647 rv
= st
->ss
->write_bitmap(st
, fd
, sbv
);
651 fprintf(stderr
, Name
": failed to write superblock to %s\n", devname
);
655 static int compare_super0(void **firstp
, void *secondv
)
659 * 0 same, or first was empty, and second was copied
660 * 1 second had wrong number
664 mdp_super_t
*first
= *firstp
;
665 mdp_super_t
*second
= secondv
;
667 int uuid1
[4], uuid2
[4];
668 if (second
->md_magic
!= MD_SB_MAGIC
)
671 first
= malloc(MD_SB_BYTES
+ sizeof(struct bitmap_super_s
));
672 memcpy(first
, second
, MD_SB_BYTES
+ sizeof(struct bitmap_super_s
));
677 uuid_from_super0(uuid1
, first
);
678 uuid_from_super0(uuid2
, second
);
679 if (!same_uuid(uuid1
, uuid2
, 0))
681 if (first
->major_version
!= second
->major_version
||
682 first
->minor_version
!= second
->minor_version
||
683 first
->patch_version
!= second
->patch_version
||
684 first
->gvalid_words
!= second
->gvalid_words
||
685 first
->ctime
!= second
->ctime
||
686 first
->level
!= second
->level
||
687 first
->size
!= second
->size
||
688 first
->raid_disks
!= second
->raid_disks
)
695 static int load_super0(struct supertype
*st
, int fd
, void **sbp
, char *devname
)
697 /* try to read in the superblock
700 * 1 on cannot get superblock
701 * 2 on superblock meaningless
704 unsigned long long dsize
;
705 unsigned long long offset
;
708 struct bitmap_super_s
*bsb
;
710 if (!get_dev_size(fd
, devname
, &dsize
))
713 if (dsize
< MD_RESERVED_SECTORS
*512 * 2) {
715 fprintf(stderr
, Name
": %s is too small for md: size is %ld sectors.\n",
720 offset
= MD_NEW_SIZE_SECTORS(dsize
>>9);
724 ioctl(fd
, BLKFLSBUF
, 0); /* make sure we read current data */
726 if (lseek64(fd
, offset
, 0)< 0LL) {
728 fprintf(stderr
, Name
": Cannot seek to superblock on %s: %s\n",
729 devname
, strerror(errno
));
733 super
= malloc(MD_SB_BYTES
+ sizeof(bitmap_super_t
));
735 if (read(fd
, super
, sizeof(*super
)) != MD_SB_BYTES
) {
737 fprintf(stderr
, Name
": Cannot read superblock on %s\n",
743 if (st
->ss
&& st
->minor_version
== 9)
744 super0_swap_endian(super
);
746 if (super
->md_magic
!= MD_SB_MAGIC
) {
748 fprintf(stderr
, Name
": No super block found on %s (Expected magic %08x, got %08x)\n",
749 devname
, MD_SB_MAGIC
, super
->md_magic
);
754 if (super
->major_version
!= 0) {
756 fprintf(stderr
, Name
": Cannot interpret superblock on %s - version is %d\n",
757 devname
, super
->major_version
);
762 if (st
->ss
== NULL
) {
764 st
->minor_version
= 90;
765 st
->max_devs
= MD_SB_DISKS
;
768 /* Now check on the bitmap superblock */
769 if ((super
->state
& (1<<MD_SB_BITMAP_PRESENT
)) == 0)
771 /* Read the bitmap superblock and make sure it looks
772 * valid. If it doesn't clear the bit. An --assemble --force
773 * should get that written out.
775 if (read(fd
, super
+1, sizeof(struct bitmap_super_s
))
776 != sizeof(struct bitmap_super_s
))
779 uuid_from_super0(uuid
, super
);
780 bsb
= (struct bitmap_super_s
*)(super
+1);
781 if (__le32_to_cpu(bsb
->magic
) != BITMAP_MAGIC
||
782 memcmp(bsb
->uuid
, uuid
, 16) != 0)
787 super
->state
&= ~(1<<MD_SB_BITMAP_PRESENT
);
792 static struct supertype
*match_metadata_desc0(char *arg
)
794 struct supertype
*st
= malloc(sizeof(*st
));
798 st
->minor_version
= 90;
799 st
->max_devs
= MD_SB_DISKS
;
800 if (strcmp(arg
, "0") == 0 ||
801 strcmp(arg
, "0.90") == 0 ||
802 strcmp(arg
, "default") == 0
806 st
->minor_version
= 9; /* flag for 'byte-swapped' */
807 if (strcmp(arg
, "0.swap")==0)
814 static __u64
avail_size0(struct supertype
*st
, __u64 devsize
)
816 if (devsize
< MD_RESERVED_SECTORS
*2)
818 return MD_NEW_SIZE_SECTORS(devsize
);
821 static int add_internal_bitmap0(struct supertype
*st
, void *sbv
, int *chunkp
,
822 int delay
, int write_behind
,
823 unsigned long long size
, int may_change
,
827 * The bitmap comes immediately after the superblock and must be 60K in size
828 * at most. The default size is between 30K and 60K
830 * size is in sectors, chunk is in bytes !!!
832 unsigned long long bits
;
833 unsigned long long max_bits
= 60*1024*8;
834 unsigned long long min_chunk
;
836 mdp_super_t
*sb
= sbv
;
837 bitmap_super_t
*bms
= (bitmap_super_t
*)(((char*)sb
) + MD_SB_BYTES
);
840 min_chunk
= 4096; /* sub-page chunks don't work yet.. */
841 bits
= (size
* 512) / min_chunk
+ 1;
842 while (bits
> max_bits
) {
848 else if (chunk
< min_chunk
)
849 return 0; /* chunk size too small */
851 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
853 memset(bms
, 0, sizeof(*bms
));
854 bms
->magic
= __cpu_to_le32(BITMAP_MAGIC
);
855 bms
->version
= __cpu_to_le32(major
);
856 uuid_from_super0((int*)bms
->uuid
, sb
);
857 bms
->chunksize
= __cpu_to_le32(chunk
);
858 bms
->daemon_sleep
= __cpu_to_le32(delay
);
859 bms
->sync_size
= __cpu_to_le64(size
);
860 bms
->write_behind
= __cpu_to_le32(write_behind
);
866 void locate_bitmap0(struct supertype
*st
, int fd
, void *sbv
)
868 unsigned long long dsize
;
869 unsigned long long offset
;
871 if (!get_dev_size(fd
, NULL
, &dsize
))
874 if (dsize
< MD_RESERVED_SECTORS
*512 * 2)
877 offset
= MD_NEW_SIZE_SECTORS(dsize
>>9);
881 offset
+= MD_SB_BYTES
;
883 lseek64(fd
, offset
, 0);
886 int write_bitmap0(struct supertype
*st
, int fd
, void *sbv
)
888 unsigned long long dsize
;
889 unsigned long long offset
;
890 mdp_super_t
*sb
= sbv
;
897 if (!get_dev_size(fd
, NULL
, &dsize
))
901 if (dsize
< MD_RESERVED_SECTORS
*512 * 2)
904 offset
= MD_NEW_SIZE_SECTORS(dsize
>>9);
908 if (lseek64(fd
, offset
+ 4096, 0)< 0LL)
912 if (write(fd
, ((char*)sb
)+MD_SB_BYTES
, sizeof(bitmap_super_t
)) !=
913 sizeof(bitmap_super_t
))
915 towrite
= 64*1024 - MD_SB_BYTES
- sizeof(bitmap_super_t
);
916 memset(buf
, 0xff, sizeof(buf
));
917 while (towrite
> 0) {
921 n
= write(fd
, buf
, n
);
934 struct superswitch super0
= {
936 .examine_super
= examine_super0
,
937 .brief_examine_super
= brief_examine_super0
,
938 .detail_super
= detail_super0
,
939 .brief_detail_super
= brief_detail_super0
,
941 .match_home
= match_home0
,
942 .uuid_from_super
= uuid_from_super0
,
943 .getinfo_super
= getinfo_super0
,
944 .update_super
= update_super0
,
945 .init_super
= init_super0
,
946 .add_to_super
= add_to_super0
,
947 .store_super
= store_super0
,
948 .write_init_super
= write_init_super0
,
949 .compare_super
= compare_super0
,
950 .load_super
= load_super0
,
951 .match_metadata_desc
= match_metadata_desc0
,
952 .avail_size
= avail_size0
,
953 .add_internal_bitmap
= add_internal_bitmap0
,
954 .locate_bitmap
= locate_bitmap0
,
955 .write_bitmap
= write_bitmap0
,