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
, 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
);
250 /* work_disks is calculated rather than read directly */
251 for (i
=0; i
< MD_SB_DISKS
; i
++)
252 if ((sb
->disks
[i
].state
& (1<<MD_DISK_SYNC
)) &&
253 (sb
->disks
[i
].state
& (1<<MD_DISK_ACTIVE
)) &&
254 !(sb
->disks
[i
].state
& (1<<MD_DISK_FAULTY
)))
256 info
->array
.working_disks
= working
;
260 static int update_super0(struct mdinfo
*info
, void *sbv
, char *update
, char *devname
, int verbose
)
263 mdp_super_t
*sb
= sbv
;
264 if (strcmp(update
, "sparc2.2")==0 ) {
265 /* 2.2 sparc put the events in the wrong place
266 * So we copy the tail of the superblock
267 * up 4 bytes before continuing
269 __u32
*sb32
= (__u32
*)sb
;
270 memcpy(sb32
+MD_SB_GENERIC_CONSTANT_WORDS
+7,
271 sb32
+MD_SB_GENERIC_CONSTANT_WORDS
+7+1,
272 (MD_SB_WORDS
- (MD_SB_GENERIC_CONSTANT_WORDS
+7+1))*4);
273 fprintf (stderr
, Name
": adjusting superblock of %s for 2.2/sparc compatability.\n",
276 if (strcmp(update
, "super-minor") ==0) {
277 sb
->md_minor
= info
->array
.md_minor
;
279 fprintf(stderr
, Name
": updating superblock of %s with minor number %d\n",
280 devname
, info
->array
.md_minor
);
282 if (strcmp(update
, "summaries") == 0) {
284 /* set nr_disks, active_disks, working_disks,
285 * failed_disks, spare_disks based on disks[]
286 * array in superblock.
287 * Also make sure extra slots aren't 'failed'
289 sb
->nr_disks
= sb
->active_disks
=
290 sb
->working_disks
= sb
->failed_disks
=
292 for (i
=0; i
< MD_SB_DISKS
; i
++)
293 if (sb
->disks
[i
].major
||
294 sb
->disks
[i
].minor
) {
295 int state
= sb
->disks
[i
].state
;
296 if (state
& (1<<MD_DISK_REMOVED
))
299 if (state
& (1<<MD_DISK_ACTIVE
))
301 if (state
& (1<<MD_DISK_FAULTY
))
307 } else if (i
>= sb
->raid_disks
&& sb
->disks
[i
].number
== 0)
308 sb
->disks
[i
].state
= 0;
310 if (strcmp(update
, "force")==0) {
311 sb
->events_hi
= (info
->events
>>32) & 0xFFFFFFFF;
312 sb
->events_lo
= (info
->events
) & 0xFFFFFFFF;
313 if (sb
->level
== 5 || sb
->level
== 4 || sb
->level
== 6)
314 /* need to force clean */
315 sb
->state
|= (1 << MD_SB_CLEAN
);
317 if (strcmp(update
, "assemble")==0) {
318 int d
= info
->disk
.number
;
319 int wonly
= sb
->disks
[d
].state
& (1<<MD_DISK_WRITEMOSTLY
);
320 sb
->disks
[d
].state
&= ~(1<<MD_DISK_WRITEMOSTLY
);
321 if (sb
->disks
[d
].state
!= info
->disk
.state
) {
322 sb
->disks
[d
].state
= info
->disk
.state
& wonly
;
326 if (strcmp(update
, "newdev") == 0) {
327 int d
= info
->disk
.number
;
328 memset(&sb
->disks
[d
], 0, sizeof(sb
->disks
[d
]));
329 sb
->disks
[d
].number
= d
;
330 sb
->disks
[d
].major
= info
->disk
.major
;
331 sb
->disks
[d
].minor
= info
->disk
.minor
;
332 sb
->disks
[d
].raid_disk
= info
->disk
.raid_disk
;
333 sb
->disks
[d
].state
= info
->disk
.state
;
334 sb
->this_disk
= sb
->disks
[d
];
336 if (strcmp(update
, "grow") == 0) {
337 sb
->raid_disks
= info
->array
.raid_disks
;
338 sb
->nr_disks
= info
->array
.nr_disks
;
339 sb
->active_disks
= info
->array
.active_disks
;
340 sb
->working_disks
= info
->array
.working_disks
;
341 memset(&sb
->disks
[info
->disk
.number
], 0, sizeof(sb
->disks
[0]));
342 sb
->disks
[info
->disk
.number
].number
= info
->disk
.number
;
343 sb
->disks
[info
->disk
.number
].major
= info
->disk
.major
;
344 sb
->disks
[info
->disk
.number
].minor
= info
->disk
.minor
;
345 sb
->disks
[info
->disk
.number
].raid_disk
= info
->disk
.raid_disk
;
346 sb
->disks
[info
->disk
.number
].state
= info
->disk
.state
;
347 if (sb
->this_disk
.number
== info
->disk
.number
)
348 sb
->this_disk
= sb
->disks
[info
->disk
.number
];
350 if (strcmp(update
, "resync") == 0) {
351 /* make sure resync happens */
352 sb
->state
&= ~(1<<MD_SB_CLEAN
);
356 sb
->sb_csum
= calc_sb0_csum(sb
);
360 static __u64
event_super0(void *sbv
)
362 mdp_super_t
*sb
= sbv
;
368 static int init_super0(struct supertype
*st
, void **sbp
, mdu_array_info_t
*info
)
370 mdp_super_t
*sb
= malloc(MD_SB_BYTES
+ sizeof(bitmap_super_t
));
373 memset(sb
, 0, MD_SB_BYTES
+ sizeof(bitmap_super_t
));
375 if (info
->major_version
== -1) {
376 /* zeroing the superblock */
380 spares
= info
->working_disks
- info
->active_disks
;
381 if (info
->raid_disks
+ spares
> MD_SB_DISKS
) {
382 fprintf(stderr
, Name
": too many devices requested: %d+%d > %d\n",
383 info
->raid_disks
, spares
, MD_SB_DISKS
);
387 rfd
= open("/dev/urandom", O_RDONLY
);
388 sb
->md_magic
= MD_SB_MAGIC
;
389 sb
->major_version
= 0;
390 sb
->minor_version
= 90;
391 sb
->patch_version
= 0;
392 sb
->gvalid_words
= 0; /* ignored */
393 if (rfd
< 0 || read(rfd
, &sb
->set_uuid0
, 4) != 4)
394 sb
->set_uuid0
= random();
396 sb
->level
= info
->level
;
397 sb
->size
= info
->size
;
398 sb
->nr_disks
= info
->nr_disks
;
399 sb
->raid_disks
= info
->raid_disks
;
400 sb
->md_minor
= info
->md_minor
;
401 sb
->not_persistent
= 0;
402 if (rfd
< 0 || read(rfd
, &sb
->set_uuid1
, 12) != 12) {
403 sb
->set_uuid1
= random();
404 sb
->set_uuid2
= random();
405 sb
->set_uuid3
= random();
410 sb
->utime
= sb
->ctime
;
411 sb
->state
= info
->state
;
412 sb
->active_disks
= info
->active_disks
;
413 sb
->working_disks
= info
->working_disks
;
414 sb
->failed_disks
= info
->failed_disks
;
415 sb
->spare_disks
= info
->spare_disks
;
419 sb
->layout
= info
->layout
;
420 sb
->chunk_size
= info
->chunk_size
;
426 /* Add a device to the superblock being created */
427 static void add_to_super0(void *sbv
, mdu_disk_info_t
*dinfo
)
429 mdp_super_t
*sb
= sbv
;
430 mdp_disk_t
*dk
= &sb
->disks
[dinfo
->number
];
432 dk
->number
= dinfo
->number
;
433 dk
->major
= dinfo
->major
;
434 dk
->minor
= dinfo
->minor
;
435 dk
->raid_disk
= dinfo
->raid_disk
;
436 dk
->state
= dinfo
->state
;
439 static int store_super0(struct supertype
*st
, int fd
, void *sbv
)
442 unsigned long long dsize
;
443 unsigned long long offset
;
444 mdp_super_t
*super
= sbv
;
447 if (ioctl(fd
, BLKGETSIZE64
, &dsize
) != 0)
450 if (ioctl(fd
, BLKGETSIZE
, &size
))
453 dsize
= ((unsigned long long)size
)<<9;
456 if (dsize
< MD_RESERVED_SECTORS
*2)
459 offset
= MD_NEW_SIZE_SECTORS(dsize
>>9);
463 if (lseek64(fd
, offset
, 0)< 0LL)
466 if (write(fd
, super
, sizeof(*super
)) != sizeof(*super
))
473 static int write_init_super0(struct supertype
*st
, void *sbv
, mdu_disk_info_t
*dinfo
, char *devname
)
475 mdp_super_t
*sb
= sbv
;
476 int fd
= open(devname
, O_RDWR
|O_EXCL
);
480 fprintf(stderr
, Name
": Failed to open %s to write superblock\n", devname
);
484 sb
->disks
[dinfo
->number
].state
&= ~(1<<MD_DISK_FAULTY
);
485 sb
->disks
[dinfo
->number
].state
|= (1<<MD_DISK_SYNC
);
487 sb
->this_disk
= sb
->disks
[dinfo
->number
];
488 sb
->sb_csum
= calc_sb0_csum(sb
);
489 rv
= store_super0(st
, fd
, sb
);
491 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
495 write(fd
, ((char*)sb
)+MD_SB_BYTES
, sizeof(bitmap_super_t
));
496 towrite
= 64*1024 - MD_SB_BYTES
- sizeof(bitmap_super_t
);
497 memset(buf
, 0xff, sizeof(buf
));
498 while (towrite
> 0) {
502 n
= write(fd
, buf
, n
);
515 fprintf(stderr
, Name
": failed to write superblock to %s\n", devname
);
519 static int compare_super0(void **firstp
, void *secondv
)
523 * 0 same, or first was empty, and second was copied
524 * 1 second had wrong number
528 mdp_super_t
*first
= *firstp
;
529 mdp_super_t
*second
= secondv
;
531 int uuid1
[4], uuid2
[4];
532 if (second
->md_magic
!= MD_SB_MAGIC
)
535 first
= malloc(MD_SB_BYTES
);
536 memcpy(first
, second
, MD_SB_BYTES
);
541 uuid_from_super0(uuid1
, first
);
542 uuid_from_super0(uuid2
, second
);
543 if (!same_uuid(uuid1
, uuid2
, 0))
545 if (first
->major_version
!= second
->major_version
||
546 first
->minor_version
!= second
->minor_version
||
547 first
->patch_version
!= second
->patch_version
||
548 first
->gvalid_words
!= second
->gvalid_words
||
549 first
->ctime
!= second
->ctime
||
550 first
->level
!= second
->level
||
551 first
->size
!= second
->size
||
552 first
->raid_disks
!= second
->raid_disks
)
559 static int load_super0(struct supertype
*st
, int fd
, void **sbp
, char *devname
)
561 /* try to read in the superblock
564 * 1 on cannot get superblock
565 * 2 on superblock meaningless
568 unsigned long long dsize
;
569 unsigned long long offset
;
573 if (ioctl(fd
, BLKGETSIZE64
, &dsize
) != 0)
576 if (ioctl(fd
, BLKGETSIZE
, &size
)) {
578 fprintf(stderr
, Name
": cannot find device size for %s: %s\n",
579 devname
, strerror(errno
));
585 if (dsize
< MD_RESERVED_SECTORS
*2) {
587 fprintf(stderr
, Name
": %s is too small for md: size is %ld sectors.\n",
592 offset
= MD_NEW_SIZE_SECTORS(dsize
>>9);
596 ioctl(fd
, BLKFLSBUF
, 0); /* make sure we read current data */
598 if (lseek64(fd
, offset
, 0)< 0LL) {
600 fprintf(stderr
, Name
": Cannot seek to superblock on %s: %s\n",
601 devname
, strerror(errno
));
605 super
= malloc(MD_SB_BYTES
+ sizeof(bitmap_super_t
));
607 if (read(fd
, super
, sizeof(*super
)) != MD_SB_BYTES
) {
609 fprintf(stderr
, Name
": Cannot read superblock on %s\n",
615 if (st
->ss
&& st
->minor_version
== 9)
616 super0_swap_endian(super
);
618 if (super
->md_magic
!= MD_SB_MAGIC
) {
620 fprintf(stderr
, Name
": No super block found on %s (Expected magic %08x, got %08x)\n",
621 devname
, MD_SB_MAGIC
, super
->md_magic
);
626 if (super
->major_version
!= 0) {
628 fprintf(stderr
, Name
": Cannot interpret superblock on %s - version is %d\n",
629 devname
, super
->major_version
);
634 if (st
->ss
== NULL
) {
636 st
->minor_version
= 90;
637 st
->max_devs
= MD_SB_DISKS
;
643 static struct supertype
*match_metadata_desc0(char *arg
)
645 struct supertype
*st
= malloc(sizeof(*st
));
649 st
->minor_version
= 90;
650 st
->max_devs
= MD_SB_DISKS
;
651 if (strcmp(arg
, "0") == 0 ||
652 strcmp(arg
, "0.90") == 0 ||
653 strcmp(arg
, "default") == 0
657 st
->minor_version
= 9; /* flag for 'byte-swapped' */
658 if (strcmp(arg
, "0.swap")==0)
665 static __u64
avail_size0(__u64 devsize
)
667 if (devsize
< MD_RESERVED_SECTORS
*2)
669 return MD_NEW_SIZE_SECTORS(devsize
);
672 static int add_internal_bitmap0(void *sbv
, int chunk
, int delay
, int write_behind
, unsigned long long size
)
675 * The bitmap comes immediately after the superblock and must be 60K in size
676 * at most. The default size is between 30K and 60K
678 * size is in K, chunk is in bytes !!!
681 unsigned long long bits
= size
;
682 unsigned long long max_bits
= 60*1024*8;
683 unsigned long long min_chunk
;
684 mdp_super_t
*sb
= sbv
;
685 bitmap_super_t
*bms
= (bitmap_super_t
*)(((char*)sb
) + MD_SB_BYTES
);
688 min_chunk
= 4096; /* sub-page chunks don't work yet.. */
689 while (bits
> max_bits
) {
695 else if (chunk
< min_chunk
)
696 return 0; /* chunk size too small */
698 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
700 memset(bms
, sizeof(*bms
), 0);
701 bms
->magic
= __cpu_to_le32(BITMAP_MAGIC
);
702 bms
->version
= __cpu_to_le32(BITMAP_MAJOR
);
703 uuid_from_super0((int*)bms
->uuid
, sb
);
704 bms
->chunksize
= __cpu_to_le32(chunk
);
705 bms
->daemon_sleep
= __cpu_to_le32(delay
);
706 bms
->sync_size
= __cpu_to_le64(size
);
707 bms
->write_behind
= __cpu_to_le32(write_behind
);
715 void locate_bitmap0(struct supertype
*st
, int fd
)
717 unsigned long long dsize
;
719 unsigned long long offset
;
721 if (ioctl(fd
, BLKGETSIZE64
, &dsize
) != 0)
724 if (ioctl(fd
, BLKGETSIZE
, &size
))
727 dsize
= ((unsigned long long)size
)<<9;
730 if (dsize
< MD_RESERVED_SECTORS
*2)
733 offset
= MD_NEW_SIZE_SECTORS(dsize
>>9);
737 offset
+= MD_SB_BYTES
;
739 lseek64(fd
, offset
, 0);
742 int write_bitmap0(struct supertype
*st
, int fd
, void *sbv
)
745 unsigned long long dsize
;
746 unsigned long long offset
;
747 mdp_super_t
*sb
= sbv
;
755 if (ioctl(fd
, BLKGETSIZE64
, &dsize
) != 0)
758 if (ioctl(fd
, BLKGETSIZE
, &size
))
761 dsize
= ((unsigned long long)size
)<<9;
764 if (dsize
< MD_RESERVED_SECTORS
*2)
767 offset
= MD_NEW_SIZE_SECTORS(dsize
>>9);
771 if (lseek64(fd
, offset
+ 4096, 0)< 0LL)
775 write(fd
, ((char*)sb
)+MD_SB_BYTES
, sizeof(bitmap_super_t
));
776 towrite
= 64*1024 - MD_SB_BYTES
- sizeof(bitmap_super_t
);
777 memset(buf
, 0xff, sizeof(buf
));
778 while (towrite
> 0) {
782 n
= write(fd
, buf
, n
);
795 struct superswitch super0
= {
797 .examine_super
= examine_super0
,
798 .brief_examine_super
= brief_examine_super0
,
799 .detail_super
= detail_super0
,
800 .brief_detail_super
= brief_detail_super0
,
802 .uuid_from_super
= uuid_from_super0
,
803 .getinfo_super
= getinfo_super0
,
804 .update_super
= update_super0
,
805 .event_super
= event_super0
,
806 .init_super
= init_super0
,
807 .add_to_super
= add_to_super0
,
808 .store_super
= store_super0
,
809 .write_init_super
= write_init_super0
,
810 .compare_super
= compare_super0
,
811 .load_super
= load_super0
,
812 .match_metadata_desc
= match_metadata_desc0
,
813 .avail_size
= avail_size0
,
814 .add_internal_bitmap
= add_internal_bitmap0
,
815 .locate_bitmap
= locate_bitmap0
,
816 .write_bitmap
= write_bitmap0
,