2 * mdadm - manage Linux "md" devices aka RAID arrays.
4 * Copyright (C) 2001-2004 Neil Brown <neilb@cse.unsw.edu.au>
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 <asm/byteorder.h>
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
)
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\n", sb
->set_uuid0
, sb
->set_uuid1
,
100 sb
->set_uuid2
, sb
->set_uuid3
);
102 printf(" UUID : %08x\n", sb
->set_uuid0
);
105 printf(" Creation Time : %.24s\n", ctime(&atime
));
106 c
=map_num(pers
, sb
->level
);
107 printf(" Raid Level : %s\n", c
?c
:"-unknown-");
108 if ((int)sb
->level
>= 0)
109 printf(" Device Size : %d%s\n", sb
->size
, human_size((long long)sb
->size
<<10));
110 printf(" Raid Devices : %d\n", sb
->raid_disks
);
111 printf(" Total Devices : %d\n", sb
->nr_disks
);
112 printf("Preferred Minor : %d\n", sb
->md_minor
);
115 printf(" Update Time : %.24s\n", ctime(&atime
));
116 printf(" State : %s\n",
117 (sb
->state
&(1<<MD_SB_CLEAN
))?"clean":"active");
118 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
))
119 printf("Internal Bitmap : present\n");
120 printf(" Active Devices : %d\n", sb
->active_disks
);
121 printf("Working Devices : %d\n", sb
->working_disks
);
122 printf(" Failed Devices : %d\n", sb
->failed_disks
);
123 printf(" Spare Devices : %d\n", sb
->spare_disks
);
124 if (calc_sb0_csum(sb
) == sb
->sb_csum
)
125 printf(" Checksum : %x - correct\n", sb
->sb_csum
);
127 printf(" Checksum : %x - expected %lx\n", sb
->sb_csum
, calc_sb0_csum(sb
));
128 printf(" Events : %d.%d\n", sb
->events_hi
, sb
->events_lo
);
130 if (sb
->level
== 5) {
131 c
= map_num(r5layout
, sb
->layout
);
132 printf(" Layout : %s\n", c
?c
:"-unknown-");
138 printf(" Chunk Size : %dK\n", sb
->chunk_size
/1024);
141 printf(" Rounding : %dK\n", sb
->chunk_size
/1024);
146 printf(" Number Major Minor RaidDevice State\n");
147 for (d
= -1; d
<(signed int)(sb
->raid_disks
+sb
->spare_disks
); d
++) {
152 if (d
>=0) dp
= &sb
->disks
[d
];
153 else dp
= &sb
->this_disk
;
154 snprintf(nb
, sizeof(nb
), "%4d", d
);
155 printf("%4s %5d %5d %5d %5d ", d
< 0 ? "this" : nb
,
156 dp
->number
, dp
->major
, dp
->minor
, dp
->raid_disk
);
157 wonly
= dp
->state
& (1<<MD_DISK_WRITEMOSTLY
);
158 dp
->state
&= ~(1<<MD_DISK_WRITEMOSTLY
);
159 if (dp
->state
& (1<<MD_DISK_FAULTY
)) printf(" faulty");
160 if (dp
->state
& (1<<MD_DISK_ACTIVE
)) printf(" active");
161 if (dp
->state
& (1<<MD_DISK_SYNC
)) printf(" sync");
162 if (dp
->state
& (1<<MD_DISK_REMOVED
)) printf(" removed");
163 if (wonly
) printf(" write-mostly");
164 if (dp
->state
== 0) printf(" spare");
165 if ((dv
=map_dev(dp
->major
, dp
->minor
)))
168 if (d
== -1) printf("\n");
172 static void brief_examine_super0(void *sbv
)
174 mdp_super_t
*sb
= sbv
;
175 char *c
=map_num(pers
, sb
->level
);
177 printf("ARRAY %s level=%s num-devices=%d UUID=",
178 get_md_name(sb
->md_minor
),
179 c
?c
:"-unknown-", sb
->raid_disks
);
180 if (sb
->minor_version
>= 90)
181 printf("%08x:%08x:%08x:%08x", sb
->set_uuid0
, sb
->set_uuid1
,
182 sb
->set_uuid2
, sb
->set_uuid3
);
184 printf("%08x", sb
->set_uuid0
);
188 static void detail_super0(void *sbv
)
190 mdp_super_t
*sb
= sbv
;
192 if (sb
->minor_version
>= 90)
193 printf("%08x:%08x:%08x:%08x", sb
->set_uuid0
, sb
->set_uuid1
,
194 sb
->set_uuid2
, sb
->set_uuid3
);
196 printf("%08x", sb
->set_uuid0
);
197 printf("\n Events : %d.%d\n\n", sb
->events_hi
, sb
->events_lo
);
200 static void brief_detail_super0(void *sbv
)
202 mdp_super_t
*sb
= sbv
;
204 if (sb
->minor_version
>= 90)
205 printf("%08x:%08x:%08x:%08x", sb
->set_uuid0
, sb
->set_uuid1
,
206 sb
->set_uuid2
, sb
->set_uuid3
);
208 printf("%08x", sb
->set_uuid0
);
211 static void uuid_from_super0(int uuid
[4], void * sbv
)
213 mdp_super_t
*super
= sbv
;
214 uuid
[0] = super
->set_uuid0
;
215 if (super
->minor_version
>= 90) {
216 uuid
[1] = super
->set_uuid1
;
217 uuid
[2] = super
->set_uuid2
;
218 uuid
[3] = super
->set_uuid3
;
226 static void getinfo_super0(struct mdinfo
*info
, mddev_ident_t ident
, void *sbv
)
228 mdp_super_t
*sb
= sbv
;
232 info
->array
.major_version
= sb
->major_version
;
233 info
->array
.minor_version
= sb
->minor_version
;
234 info
->array
.patch_version
= sb
->patch_version
;
235 info
->array
.raid_disks
= sb
->raid_disks
;
236 info
->array
.level
= sb
->level
;
237 info
->array
.md_minor
= sb
->md_minor
;
238 info
->array
.ctime
= sb
->ctime
;
240 info
->disk
.state
= sb
->this_disk
.state
;
241 info
->disk
.major
= sb
->this_disk
.major
;
242 info
->disk
.minor
= sb
->this_disk
.minor
;
243 info
->disk
.raid_disk
= sb
->this_disk
.raid_disk
;
244 info
->disk
.number
= sb
->this_disk
.number
;
246 info
->events
= md_event(sb
);
248 uuid_from_super0(info
->uuid
, sbv
);
251 /* work_disks is calculated rather than read directly */
252 for (i
=0; i
< MD_SB_DISKS
; i
++)
253 if ((sb
->disks
[i
].state
& (1<<MD_DISK_SYNC
)) &&
254 (sb
->disks
[i
].state
& (1<<MD_DISK_ACTIVE
)) &&
255 !(sb
->disks
[i
].state
& (1<<MD_DISK_FAULTY
)))
257 info
->array
.working_disks
= working
;
261 static int update_super0(struct mdinfo
*info
, void *sbv
, char *update
, char *devname
, int verbose
)
264 mdp_super_t
*sb
= sbv
;
265 if (strcmp(update
, "sparc2.2")==0 ) {
266 /* 2.2 sparc put the events in the wrong place
267 * So we copy the tail of the superblock
268 * up 4 bytes before continuing
270 __u32
*sb32
= (__u32
*)sb
;
271 memcpy(sb32
+MD_SB_GENERIC_CONSTANT_WORDS
+7,
272 sb32
+MD_SB_GENERIC_CONSTANT_WORDS
+7+1,
273 (MD_SB_WORDS
- (MD_SB_GENERIC_CONSTANT_WORDS
+7+1))*4);
274 fprintf (stderr
, Name
": adjusting superblock of %s for 2.2/sparc compatability.\n",
277 if (strcmp(update
, "super-minor") ==0) {
278 sb
->md_minor
= info
->array
.md_minor
;
280 fprintf(stderr
, Name
": updating superblock of %s with minor number %d\n",
281 devname
, info
->array
.md_minor
);
283 if (strcmp(update
, "summaries") == 0) {
285 /* set nr_disks, active_disks, working_disks,
286 * failed_disks, spare_disks based on disks[]
287 * array in superblock.
288 * Also make sure extra slots aren't 'failed'
290 sb
->nr_disks
= sb
->active_disks
=
291 sb
->working_disks
= sb
->failed_disks
=
293 for (i
=0; i
< MD_SB_DISKS
; i
++)
294 if (sb
->disks
[i
].major
||
295 sb
->disks
[i
].minor
) {
296 int state
= sb
->disks
[i
].state
;
297 if (state
& (1<<MD_DISK_REMOVED
))
300 if (state
& (1<<MD_DISK_ACTIVE
))
302 if (state
& (1<<MD_DISK_FAULTY
))
308 } else if (i
>= sb
->raid_disks
&& sb
->disks
[i
].number
== 0)
309 sb
->disks
[i
].state
= 0;
311 if (strcmp(update
, "force")==0) {
312 sb
->events_hi
= (info
->events
>>32) & 0xFFFFFFFF;
313 sb
->events_lo
= (info
->events
) & 0xFFFFFFFF;
314 if (sb
->level
== 5 || sb
->level
== 4 || sb
->level
== 6)
315 /* need to force clean */
316 sb
->state
|= (1 << MD_SB_CLEAN
);
318 if (strcmp(update
, "assemble")==0) {
319 int d
= info
->disk
.number
;
320 int wonly
= sb
->disks
[d
].state
& (1<<MD_DISK_WRITEMOSTLY
);
321 sb
->disks
[d
].state
&= ~(1<<MD_DISK_WRITEMOSTLY
);
322 if (sb
->disks
[d
].state
!= info
->disk
.state
) {
323 sb
->disks
[d
].state
= info
->disk
.state
& wonly
;
327 if (strcmp(update
, "newdev") == 0) {
328 int d
= info
->disk
.number
;
329 memset(&sb
->disks
[d
], 0, sizeof(sb
->disks
[d
]));
330 sb
->disks
[d
].number
= d
;
331 sb
->disks
[d
].major
= info
->disk
.major
;
332 sb
->disks
[d
].minor
= info
->disk
.minor
;
333 sb
->disks
[d
].raid_disk
= info
->disk
.raid_disk
;
334 sb
->disks
[d
].state
= info
->disk
.state
;
335 sb
->this_disk
= sb
->disks
[d
];
337 if (strcmp(update
, "grow") == 0) {
338 sb
->raid_disks
= info
->array
.raid_disks
;
339 sb
->nr_disks
= info
->array
.nr_disks
;
340 sb
->active_disks
= info
->array
.active_disks
;
341 sb
->working_disks
= info
->array
.working_disks
;
342 memset(&sb
->disks
[info
->disk
.number
], 0, sizeof(sb
->disks
[0]));
343 sb
->disks
[info
->disk
.number
].number
= info
->disk
.number
;
344 sb
->disks
[info
->disk
.number
].major
= info
->disk
.major
;
345 sb
->disks
[info
->disk
.number
].minor
= info
->disk
.minor
;
346 sb
->disks
[info
->disk
.number
].raid_disk
= info
->disk
.raid_disk
;
347 sb
->disks
[info
->disk
.number
].state
= info
->disk
.state
;
348 if (sb
->this_disk
.number
== info
->disk
.number
)
349 sb
->this_disk
= sb
->disks
[info
->disk
.number
];
351 if (strcmp(update
, "resync") == 0) {
352 /* make sure resync happens */
353 sb
->state
&= ~(1<<MD_SB_CLEAN
);
357 sb
->sb_csum
= calc_sb0_csum(sb
);
361 static __u64
event_super0(void *sbv
)
363 mdp_super_t
*sb
= sbv
;
369 static int init_super0(struct supertype
*st
, void **sbp
, mdu_array_info_t
*info
, char *ignored_name
)
371 mdp_super_t
*sb
= malloc(MD_SB_BYTES
+ sizeof(bitmap_super_t
));
374 memset(sb
, 0, MD_SB_BYTES
+ sizeof(bitmap_super_t
));
376 if (info
->major_version
== -1) {
377 /* zeroing the superblock */
381 spares
= info
->working_disks
- info
->active_disks
;
382 if (info
->raid_disks
+ spares
> MD_SB_DISKS
) {
383 fprintf(stderr
, Name
": too many devices requested: %d+%d > %d\n",
384 info
->raid_disks
, spares
, MD_SB_DISKS
);
388 rfd
= open("/dev/urandom", O_RDONLY
);
389 sb
->md_magic
= MD_SB_MAGIC
;
390 sb
->major_version
= 0;
391 sb
->minor_version
= 90;
392 sb
->patch_version
= 0;
393 sb
->gvalid_words
= 0; /* ignored */
394 if (rfd
< 0 || read(rfd
, &sb
->set_uuid0
, 4) != 4)
395 sb
->set_uuid0
= random();
397 sb
->level
= info
->level
;
398 sb
->size
= info
->size
;
399 sb
->nr_disks
= info
->nr_disks
;
400 sb
->raid_disks
= info
->raid_disks
;
401 sb
->md_minor
= info
->md_minor
;
402 sb
->not_persistent
= 0;
403 if (rfd
< 0 || read(rfd
, &sb
->set_uuid1
, 12) != 12) {
404 sb
->set_uuid1
= random();
405 sb
->set_uuid2
= random();
406 sb
->set_uuid3
= random();
411 sb
->utime
= sb
->ctime
;
412 sb
->state
= info
->state
;
413 sb
->active_disks
= info
->active_disks
;
414 sb
->working_disks
= info
->working_disks
;
415 sb
->failed_disks
= info
->failed_disks
;
416 sb
->spare_disks
= info
->spare_disks
;
420 sb
->layout
= info
->layout
;
421 sb
->chunk_size
= info
->chunk_size
;
427 /* Add a device to the superblock being created */
428 static void add_to_super0(void *sbv
, mdu_disk_info_t
*dinfo
)
430 mdp_super_t
*sb
= sbv
;
431 mdp_disk_t
*dk
= &sb
->disks
[dinfo
->number
];
433 dk
->number
= dinfo
->number
;
434 dk
->major
= dinfo
->major
;
435 dk
->minor
= dinfo
->minor
;
436 dk
->raid_disk
= dinfo
->raid_disk
;
437 dk
->state
= dinfo
->state
;
440 static int store_super0(struct supertype
*st
, int fd
, void *sbv
)
443 unsigned long long dsize
;
444 unsigned long long offset
;
445 mdp_super_t
*super
= sbv
;
448 if (ioctl(fd
, BLKGETSIZE64
, &dsize
) != 0)
451 if (ioctl(fd
, BLKGETSIZE
, &size
))
454 dsize
= ((unsigned long long)size
)<<9;
457 if (dsize
< MD_RESERVED_SECTORS
*2)
460 offset
= MD_NEW_SIZE_SECTORS(dsize
>>9);
464 if (lseek64(fd
, offset
, 0)< 0LL)
467 if (write(fd
, super
, sizeof(*super
)) != sizeof(*super
))
474 static int write_init_super0(struct supertype
*st
, void *sbv
, mdu_disk_info_t
*dinfo
, char *devname
)
476 mdp_super_t
*sb
= sbv
;
477 int fd
= open(devname
, O_RDWR
|O_EXCL
);
481 fprintf(stderr
, Name
": Failed to open %s to write superblock\n", devname
);
485 sb
->disks
[dinfo
->number
].state
&= ~(1<<MD_DISK_FAULTY
);
486 sb
->disks
[dinfo
->number
].state
|= (1<<MD_DISK_SYNC
);
488 sb
->this_disk
= sb
->disks
[dinfo
->number
];
489 sb
->sb_csum
= calc_sb0_csum(sb
);
490 rv
= store_super0(st
, fd
, sb
);
492 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
496 write(fd
, ((char*)sb
)+MD_SB_BYTES
, sizeof(bitmap_super_t
));
497 towrite
= 64*1024 - MD_SB_BYTES
- sizeof(bitmap_super_t
);
498 memset(buf
, 0xff, sizeof(buf
));
499 while (towrite
> 0) {
503 n
= write(fd
, buf
, n
);
516 fprintf(stderr
, Name
": failed to write superblock to %s\n", devname
);
520 static int compare_super0(void **firstp
, void *secondv
)
524 * 0 same, or first was empty, and second was copied
525 * 1 second had wrong number
529 mdp_super_t
*first
= *firstp
;
530 mdp_super_t
*second
= secondv
;
532 int uuid1
[4], uuid2
[4];
533 if (second
->md_magic
!= MD_SB_MAGIC
)
536 first
= malloc(MD_SB_BYTES
);
537 memcpy(first
, second
, MD_SB_BYTES
);
542 uuid_from_super0(uuid1
, first
);
543 uuid_from_super0(uuid2
, second
);
544 if (!same_uuid(uuid1
, uuid2
, 0))
546 if (first
->major_version
!= second
->major_version
||
547 first
->minor_version
!= second
->minor_version
||
548 first
->patch_version
!= second
->patch_version
||
549 first
->gvalid_words
!= second
->gvalid_words
||
550 first
->ctime
!= second
->ctime
||
551 first
->level
!= second
->level
||
552 first
->size
!= second
->size
||
553 first
->raid_disks
!= second
->raid_disks
)
560 static int load_super0(struct supertype
*st
, int fd
, void **sbp
, char *devname
)
562 /* try to read in the superblock
565 * 1 on cannot get superblock
566 * 2 on superblock meaningless
569 unsigned long long dsize
;
570 unsigned long long offset
;
574 if (ioctl(fd
, BLKGETSIZE64
, &dsize
) != 0)
577 if (ioctl(fd
, BLKGETSIZE
, &size
)) {
579 fprintf(stderr
, Name
": cannot find device size for %s: %s\n",
580 devname
, strerror(errno
));
586 if (dsize
< MD_RESERVED_SECTORS
*2) {
588 fprintf(stderr
, Name
": %s is too small for md: size is %ld sectors.\n",
593 offset
= MD_NEW_SIZE_SECTORS(dsize
>>9);
597 ioctl(fd
, BLKFLSBUF
, 0); /* make sure we read current data */
599 if (lseek64(fd
, offset
, 0)< 0LL) {
601 fprintf(stderr
, Name
": Cannot seek to superblock on %s: %s\n",
602 devname
, strerror(errno
));
606 super
= malloc(MD_SB_BYTES
+ sizeof(bitmap_super_t
));
608 if (read(fd
, super
, sizeof(*super
)) != MD_SB_BYTES
) {
610 fprintf(stderr
, Name
": Cannot read superblock on %s\n",
616 if (st
->ss
&& st
->minor_version
== 9)
617 super0_swap_endian(super
);
619 if (super
->md_magic
!= MD_SB_MAGIC
) {
621 fprintf(stderr
, Name
": No super block found on %s (Expected magic %08x, got %08x)\n",
622 devname
, MD_SB_MAGIC
, super
->md_magic
);
627 if (super
->major_version
!= 0) {
629 fprintf(stderr
, Name
": Cannot interpret superblock on %s - version is %d\n",
630 devname
, super
->major_version
);
635 if (st
->ss
== NULL
) {
637 st
->minor_version
= 90;
638 st
->max_devs
= MD_SB_DISKS
;
644 static struct supertype
*match_metadata_desc0(char *arg
)
646 struct supertype
*st
= malloc(sizeof(*st
));
650 st
->minor_version
= 90;
651 st
->max_devs
= MD_SB_DISKS
;
652 if (strcmp(arg
, "0") == 0 ||
653 strcmp(arg
, "0.90") == 0 ||
654 strcmp(arg
, "default") == 0
658 st
->minor_version
= 9; /* flag for 'byte-swapped' */
659 if (strcmp(arg
, "0.swap")==0)
666 static __u64
avail_size0(__u64 devsize
)
668 if (devsize
< MD_RESERVED_SECTORS
*2)
670 return MD_NEW_SIZE_SECTORS(devsize
);
673 static int add_internal_bitmap0(void *sbv
, int chunk
, int delay
, int write_behind
, unsigned long long size
)
676 * The bitmap comes immediately after the superblock and must be 60K in size
677 * at most. The default size is between 30K and 60K
679 * size is in K, chunk is in bytes !!!
682 unsigned long long bits
= size
;
683 unsigned long long max_bits
= 60*1024*8;
684 unsigned long long min_chunk
;
685 mdp_super_t
*sb
= sbv
;
686 bitmap_super_t
*bms
= (bitmap_super_t
*)(((char*)sb
) + MD_SB_BYTES
);
689 min_chunk
= 4096; /* sub-page chunks don't work yet.. */
690 while (bits
> max_bits
) {
696 else if (chunk
< min_chunk
)
697 return 0; /* chunk size too small */
699 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
701 memset(bms
, sizeof(*bms
), 0);
702 bms
->magic
= __cpu_to_le32(BITMAP_MAGIC
);
703 bms
->version
= __cpu_to_le32(BITMAP_MAJOR
);
704 uuid_from_super0((int*)bms
->uuid
, sb
);
705 bms
->chunksize
= __cpu_to_le32(chunk
);
706 bms
->daemon_sleep
= __cpu_to_le32(delay
);
707 bms
->sync_size
= __cpu_to_le64(size
);
708 bms
->write_behind
= __cpu_to_le32(write_behind
);
716 void locate_bitmap0(struct supertype
*st
, int fd
)
718 unsigned long long dsize
;
720 unsigned long long offset
;
722 if (ioctl(fd
, BLKGETSIZE64
, &dsize
) != 0)
725 if (ioctl(fd
, BLKGETSIZE
, &size
))
728 dsize
= ((unsigned long long)size
)<<9;
731 if (dsize
< MD_RESERVED_SECTORS
*2)
734 offset
= MD_NEW_SIZE_SECTORS(dsize
>>9);
738 offset
+= MD_SB_BYTES
;
740 lseek64(fd
, offset
, 0);
743 int write_bitmap0(struct supertype
*st
, int fd
, void *sbv
)
746 unsigned long long dsize
;
747 unsigned long long offset
;
748 mdp_super_t
*sb
= sbv
;
756 if (ioctl(fd
, BLKGETSIZE64
, &dsize
) != 0)
759 if (ioctl(fd
, BLKGETSIZE
, &size
))
762 dsize
= ((unsigned long long)size
)<<9;
765 if (dsize
< MD_RESERVED_SECTORS
*2)
768 offset
= MD_NEW_SIZE_SECTORS(dsize
>>9);
772 if (lseek64(fd
, offset
+ 4096, 0)< 0LL)
776 write(fd
, ((char*)sb
)+MD_SB_BYTES
, sizeof(bitmap_super_t
));
777 towrite
= 64*1024 - MD_SB_BYTES
- sizeof(bitmap_super_t
);
778 memset(buf
, 0xff, sizeof(buf
));
779 while (towrite
> 0) {
783 n
= write(fd
, buf
, n
);
796 struct superswitch super0
= {
798 .examine_super
= examine_super0
,
799 .brief_examine_super
= brief_examine_super0
,
800 .detail_super
= detail_super0
,
801 .brief_detail_super
= brief_detail_super0
,
803 .uuid_from_super
= uuid_from_super0
,
804 .getinfo_super
= getinfo_super0
,
805 .update_super
= update_super0
,
806 .event_super
= event_super0
,
807 .init_super
= init_super0
,
808 .add_to_super
= add_to_super0
,
809 .store_super
= store_super0
,
810 .write_init_super
= write_init_super0
,
811 .compare_super
= compare_super0
,
812 .load_super
= load_super0
,
813 .match_metadata_desc
= match_metadata_desc0
,
814 .avail_size
= avail_size0
,
815 .add_internal_bitmap
= add_internal_bitmap0
,
816 .locate_bitmap
= locate_bitmap0
,
817 .write_bitmap
= write_bitmap0
,