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
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
)
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\n", sb
->set_uuid0
, sb
->set_uuid1
,
99 sb
->set_uuid2
, sb
->set_uuid3
);
101 printf(" UUID : %08x\n", sb
->set_uuid0
);
104 printf(" Creation Time : %.24s\n", ctime(&atime
));
105 c
=map_num(pers
, sb
->level
);
106 printf(" Raid Level : %s\n", c
?c
:"-unknown-");
107 if ((int)sb
->level
>= 0) {
109 printf(" Device Size : %d%s\n", sb
->size
, human_size((long long)sb
->size
<<10));
111 case 1: ddsks
=1;break;
113 case 5: ddsks
= sb
->raid_disks
-1; break;
114 case 6: ddsks
= sb
->raid_disks
-2; break;
115 case 10: ddsks
= sb
->raid_disks
/ (sb
->layout
&255) / ((sb
->layout
>>8)&255);
118 printf(" Array Size : %llu%s\n", (unsigned long long)ddsks
* sb
->size
,
119 human_size(ddsks
*(long long)sb
->size
<<10));
121 printf(" Raid Devices : %d\n", sb
->raid_disks
);
122 printf(" Total Devices : %d\n", sb
->nr_disks
);
123 printf("Preferred Minor : %d\n", sb
->md_minor
);
125 if (sb
->minor_version
> 90 && (sb
->reshape_position
+1) != 0) {
126 printf(" Reshape pos'n : %llu%s\n", (unsigned long long)sb
->reshape_position
/2, human_size((long long)sb
->reshape_position
<<9));
127 if (sb
->delta_disks
) {
128 printf(" Delta Devices : %d", sb
->delta_disks
);
130 printf(" (%d->%d)\n", sb
->raid_disks
-sb
->delta_disks
, sb
->raid_disks
);
132 printf(" (%d->%d)\n", sb
->raid_disks
, sb
->raid_disks
+sb
->delta_disks
);
134 if (sb
->new_level
!= sb
->level
) {
135 c
= map_num(pers
, sb
->new_level
);
136 printf(" New Level : %s\n", c
?c
:"-unknown-");
138 if (sb
->new_layout
!= sb
->layout
) {
139 if (sb
->level
== 5) {
140 c
= map_num(r5layout
, sb
->new_layout
);
141 printf(" New Layout : %s\n", c
?c
:"-unknown-");
143 if (sb
->level
== 10) {
144 printf(" New Layout : near=%d, far=%d\n",
145 sb
->new_layout
&255, (sb
->new_layout
>>8)&255);
148 if (sb
->new_chunk
!= sb
->chunk_size
)
149 printf(" New Chunksize : %d\n", sb
->new_chunk
);
153 printf(" Update Time : %.24s\n", ctime(&atime
));
154 printf(" State : %s\n",
155 (sb
->state
&(1<<MD_SB_CLEAN
))?"clean":"active");
156 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
))
157 printf("Internal Bitmap : present\n");
158 printf(" Active Devices : %d\n", sb
->active_disks
);
159 printf("Working Devices : %d\n", sb
->working_disks
);
160 printf(" Failed Devices : %d\n", sb
->failed_disks
);
161 printf(" Spare Devices : %d\n", sb
->spare_disks
);
162 if (calc_sb0_csum(sb
) == sb
->sb_csum
)
163 printf(" Checksum : %x - correct\n", sb
->sb_csum
);
165 printf(" Checksum : %x - expected %lx\n", sb
->sb_csum
, calc_sb0_csum(sb
));
166 printf(" Events : %d.%d\n", sb
->events_hi
, sb
->events_lo
);
168 if (sb
->level
== 5) {
169 c
= map_num(r5layout
, sb
->layout
);
170 printf(" Layout : %s\n", c
?c
:"-unknown-");
172 if (sb
->level
== 10) {
173 printf(" Layout : near=%d, far=%d\n",
174 sb
->layout
&255, (sb
->layout
>>8)&255);
180 printf(" Chunk Size : %dK\n", sb
->chunk_size
/1024);
183 printf(" Rounding : %dK\n", sb
->chunk_size
/1024);
188 printf(" Number Major Minor RaidDevice State\n");
189 for (d
= -1; d
<(signed int)(sb
->raid_disks
+sb
->spare_disks
); d
++) {
194 if (d
>=0) dp
= &sb
->disks
[d
];
195 else dp
= &sb
->this_disk
;
196 snprintf(nb
, sizeof(nb
), "%4d", d
);
197 printf("%4s %5d %5d %5d %5d ", d
< 0 ? "this" : nb
,
198 dp
->number
, dp
->major
, dp
->minor
, dp
->raid_disk
);
199 wonly
= dp
->state
& (1<<MD_DISK_WRITEMOSTLY
);
200 dp
->state
&= ~(1<<MD_DISK_WRITEMOSTLY
);
201 if (dp
->state
& (1<<MD_DISK_FAULTY
)) printf(" faulty");
202 if (dp
->state
& (1<<MD_DISK_ACTIVE
)) printf(" active");
203 if (dp
->state
& (1<<MD_DISK_SYNC
)) printf(" sync");
204 if (dp
->state
& (1<<MD_DISK_REMOVED
)) printf(" removed");
205 if (wonly
) printf(" write-mostly");
206 if (dp
->state
== 0) printf(" spare");
207 if ((dv
=map_dev(dp
->major
, dp
->minor
)))
210 if (d
== -1) printf("\n");
214 static void brief_examine_super0(void *sbv
)
216 mdp_super_t
*sb
= sbv
;
217 char *c
=map_num(pers
, sb
->level
);
219 printf("ARRAY %s level=%s num-devices=%d UUID=",
220 get_md_name(sb
->md_minor
),
221 c
?c
:"-unknown-", sb
->raid_disks
);
222 if (sb
->minor_version
>= 90)
223 printf("%08x:%08x:%08x:%08x", sb
->set_uuid0
, sb
->set_uuid1
,
224 sb
->set_uuid2
, sb
->set_uuid3
);
226 printf("%08x", sb
->set_uuid0
);
230 static void detail_super0(void *sbv
)
232 mdp_super_t
*sb
= sbv
;
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
);
239 printf("\n Events : %d.%d\n\n", sb
->events_hi
, sb
->events_lo
);
242 static void brief_detail_super0(void *sbv
)
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
);
253 static void uuid_from_super0(int uuid
[4], void * sbv
)
255 mdp_super_t
*super
= sbv
;
256 uuid
[0] = super
->set_uuid0
;
257 if (super
->minor_version
>= 90) {
258 uuid
[1] = super
->set_uuid1
;
259 uuid
[2] = super
->set_uuid2
;
260 uuid
[3] = super
->set_uuid3
;
268 static void getinfo_super0(struct mdinfo
*info
, void *sbv
)
270 mdp_super_t
*sb
= sbv
;
274 info
->array
.major_version
= sb
->major_version
;
275 info
->array
.minor_version
= sb
->minor_version
;
276 info
->array
.patch_version
= sb
->patch_version
;
277 info
->array
.raid_disks
= sb
->raid_disks
;
278 info
->array
.level
= sb
->level
;
279 info
->array
.layout
= sb
->layout
;
280 info
->array
.md_minor
= sb
->md_minor
;
281 info
->array
.ctime
= sb
->ctime
;
282 info
->array
.utime
= sb
->utime
;
283 info
->array
.chunk_size
= sb
->chunk_size
;
284 info
->component_size
= sb
->size
*2;
286 info
->disk
.state
= sb
->this_disk
.state
;
287 info
->disk
.major
= sb
->this_disk
.major
;
288 info
->disk
.minor
= sb
->this_disk
.minor
;
289 info
->disk
.raid_disk
= sb
->this_disk
.raid_disk
;
290 info
->disk
.number
= sb
->this_disk
.number
;
292 info
->events
= md_event(sb
);
293 info
->data_offset
= 0;
295 uuid_from_super0(info
->uuid
, sbv
);
297 if (sb
->minor_version
> 90 && (sb
->reshape_position
+1) != 0) {
298 info
->reshape_active
= 1;
299 info
->reshape_progress
= sb
->reshape_position
;
300 info
->new_level
= sb
->new_level
;
301 info
->delta_disks
= sb
->delta_disks
;
302 info
->new_layout
= sb
->new_layout
;
303 info
->new_chunk
= sb
->new_chunk
;
305 info
->reshape_active
= 0;
308 /* work_disks is calculated rather than read directly */
309 for (i
=0; i
< MD_SB_DISKS
; i
++)
310 if ((sb
->disks
[i
].state
& (1<<MD_DISK_SYNC
)) &&
311 (sb
->disks
[i
].state
& (1<<MD_DISK_ACTIVE
)) &&
312 !(sb
->disks
[i
].state
& (1<<MD_DISK_FAULTY
)))
314 info
->array
.working_disks
= working
;
318 static int update_super0(struct mdinfo
*info
, void *sbv
, char *update
, char *devname
, int verbose
)
321 mdp_super_t
*sb
= sbv
;
322 if (strcmp(update
, "sparc2.2")==0 ) {
323 /* 2.2 sparc put the events in the wrong place
324 * So we copy the tail of the superblock
325 * up 4 bytes before continuing
327 __u32
*sb32
= (__u32
*)sb
;
328 memcpy(sb32
+MD_SB_GENERIC_CONSTANT_WORDS
+7,
329 sb32
+MD_SB_GENERIC_CONSTANT_WORDS
+7+1,
330 (MD_SB_WORDS
- (MD_SB_GENERIC_CONSTANT_WORDS
+7+1))*4);
332 fprintf (stderr
, Name
": adjusting superblock of %s for 2.2/sparc compatability.\n",
335 if (strcmp(update
, "super-minor") ==0) {
336 sb
->md_minor
= info
->array
.md_minor
;
338 fprintf(stderr
, Name
": updating superblock of %s with minor number %d\n",
339 devname
, info
->array
.md_minor
);
341 if (strcmp(update
, "summaries") == 0) {
343 /* set nr_disks, active_disks, working_disks,
344 * failed_disks, spare_disks based on disks[]
345 * array in superblock.
346 * Also make sure extra slots aren't 'failed'
348 sb
->nr_disks
= sb
->active_disks
=
349 sb
->working_disks
= sb
->failed_disks
=
351 for (i
=0; i
< MD_SB_DISKS
; i
++)
352 if (sb
->disks
[i
].major
||
353 sb
->disks
[i
].minor
) {
354 int state
= sb
->disks
[i
].state
;
355 if (state
& (1<<MD_DISK_REMOVED
))
358 if (state
& (1<<MD_DISK_ACTIVE
))
360 if (state
& (1<<MD_DISK_FAULTY
))
366 } else if (i
>= sb
->raid_disks
&& sb
->disks
[i
].number
== 0)
367 sb
->disks
[i
].state
= 0;
369 if (strcmp(update
, "force")==0) {
370 sb
->events_hi
= (info
->events
>>32) & 0xFFFFFFFF;
371 sb
->events_lo
= (info
->events
) & 0xFFFFFFFF;
372 if (sb
->level
== 5 || sb
->level
== 4 || sb
->level
== 6)
373 /* need to force clean */
374 sb
->state
|= (1 << MD_SB_CLEAN
);
376 if (strcmp(update
, "assemble")==0) {
377 int d
= info
->disk
.number
;
378 int wonly
= sb
->disks
[d
].state
& (1<<MD_DISK_WRITEMOSTLY
);
379 sb
->disks
[d
].state
&= ~(1<<MD_DISK_WRITEMOSTLY
);
380 if (sb
->disks
[d
].state
!= info
->disk
.state
) {
381 sb
->disks
[d
].state
= info
->disk
.state
& wonly
;
385 if (strcmp(update
, "newdev") == 0) {
386 int d
= info
->disk
.number
;
387 memset(&sb
->disks
[d
], 0, sizeof(sb
->disks
[d
]));
388 sb
->disks
[d
].number
= d
;
389 sb
->disks
[d
].major
= info
->disk
.major
;
390 sb
->disks
[d
].minor
= info
->disk
.minor
;
391 sb
->disks
[d
].raid_disk
= info
->disk
.raid_disk
;
392 sb
->disks
[d
].state
= info
->disk
.state
;
393 sb
->this_disk
= sb
->disks
[d
];
395 if (strcmp(update
, "grow") == 0) {
396 sb
->raid_disks
= info
->array
.raid_disks
;
397 sb
->nr_disks
= info
->array
.nr_disks
;
398 sb
->active_disks
= info
->array
.active_disks
;
399 sb
->working_disks
= info
->array
.working_disks
;
400 memset(&sb
->disks
[info
->disk
.number
], 0, sizeof(sb
->disks
[0]));
401 sb
->disks
[info
->disk
.number
].number
= info
->disk
.number
;
402 sb
->disks
[info
->disk
.number
].major
= info
->disk
.major
;
403 sb
->disks
[info
->disk
.number
].minor
= info
->disk
.minor
;
404 sb
->disks
[info
->disk
.number
].raid_disk
= info
->disk
.raid_disk
;
405 sb
->disks
[info
->disk
.number
].state
= info
->disk
.state
;
406 if (sb
->this_disk
.number
== info
->disk
.number
)
407 sb
->this_disk
= sb
->disks
[info
->disk
.number
];
409 if (strcmp(update
, "resync") == 0) {
410 /* make sure resync happens */
411 sb
->state
&= ~(1<<MD_SB_CLEAN
);
414 if (strcmp(update
, "uuid") == 0) {
415 sb
->set_uuid0
= info
->uuid
[0];
416 sb
->set_uuid1
= info
->uuid
[1];
417 sb
->set_uuid2
= info
->uuid
[2];
418 sb
->set_uuid3
= info
->uuid
[3];
420 if (strcmp(update
, "_reshape_progress")==0)
421 sb
->reshape_position
= info
->reshape_progress
;
423 sb
->sb_csum
= calc_sb0_csum(sb
);
427 static __u64
event_super0(void *sbv
)
429 mdp_super_t
*sb
= sbv
;
435 static int init_super0(struct supertype
*st
, void **sbp
, mdu_array_info_t
*info
, unsigned long long size
, char *ignored_name
)
437 mdp_super_t
*sb
= malloc(MD_SB_BYTES
+ sizeof(bitmap_super_t
));
440 memset(sb
, 0, MD_SB_BYTES
+ sizeof(bitmap_super_t
));
442 if (info
->major_version
== -1) {
443 /* zeroing the superblock */
447 spares
= info
->working_disks
- info
->active_disks
;
448 if (info
->raid_disks
+ spares
> MD_SB_DISKS
) {
449 fprintf(stderr
, Name
": too many devices requested: %d+%d > %d\n",
450 info
->raid_disks
, spares
, MD_SB_DISKS
);
454 rfd
= open("/dev/urandom", O_RDONLY
);
455 sb
->md_magic
= MD_SB_MAGIC
;
456 sb
->major_version
= 0;
457 sb
->minor_version
= 90;
458 sb
->patch_version
= 0;
459 sb
->gvalid_words
= 0; /* ignored */
460 if (rfd
< 0 || read(rfd
, &sb
->set_uuid0
, 4) != 4)
461 sb
->set_uuid0
= random();
463 sb
->level
= info
->level
;
464 if (size
!= info
->size
)
466 sb
->size
= info
->size
;
467 sb
->nr_disks
= info
->nr_disks
;
468 sb
->raid_disks
= info
->raid_disks
;
469 sb
->md_minor
= info
->md_minor
;
470 sb
->not_persistent
= 0;
471 if (rfd
< 0 || read(rfd
, &sb
->set_uuid1
, 12) != 12) {
472 sb
->set_uuid1
= random();
473 sb
->set_uuid2
= random();
474 sb
->set_uuid3
= random();
479 sb
->utime
= sb
->ctime
;
480 sb
->state
= info
->state
;
481 sb
->active_disks
= info
->active_disks
;
482 sb
->working_disks
= info
->working_disks
;
483 sb
->failed_disks
= info
->failed_disks
;
484 sb
->spare_disks
= info
->spare_disks
;
488 sb
->layout
= info
->layout
;
489 sb
->chunk_size
= info
->chunk_size
;
495 /* Add a device to the superblock being created */
496 static void add_to_super0(void *sbv
, mdu_disk_info_t
*dinfo
)
498 mdp_super_t
*sb
= sbv
;
499 mdp_disk_t
*dk
= &sb
->disks
[dinfo
->number
];
501 dk
->number
= dinfo
->number
;
502 dk
->major
= dinfo
->major
;
503 dk
->minor
= dinfo
->minor
;
504 dk
->raid_disk
= dinfo
->raid_disk
;
505 dk
->state
= dinfo
->state
;
508 static int store_super0(struct supertype
*st
, int fd
, void *sbv
)
511 unsigned long long dsize
;
512 unsigned long long offset
;
513 mdp_super_t
*super
= sbv
;
516 if (ioctl(fd
, BLKGETSIZE64
, &dsize
) != 0)
519 if (ioctl(fd
, BLKGETSIZE
, &size
))
522 dsize
= ((unsigned long long)size
)<<9;
525 if (dsize
< MD_RESERVED_SECTORS
*2*512)
528 offset
= MD_NEW_SIZE_SECTORS(dsize
>>9);
532 if (lseek64(fd
, offset
, 0)< 0LL)
535 if (write(fd
, super
, sizeof(*super
)) != sizeof(*super
))
542 static int write_init_super0(struct supertype
*st
, void *sbv
, mdu_disk_info_t
*dinfo
, char *devname
)
544 mdp_super_t
*sb
= sbv
;
545 int fd
= open(devname
, O_RDWR
|O_EXCL
);
549 fprintf(stderr
, Name
": Failed to open %s to write superblock\n", devname
);
553 sb
->disks
[dinfo
->number
].state
&= ~(1<<MD_DISK_FAULTY
);
554 sb
->disks
[dinfo
->number
].state
|= (1<<MD_DISK_SYNC
);
556 sb
->this_disk
= sb
->disks
[dinfo
->number
];
557 sb
->sb_csum
= calc_sb0_csum(sb
);
558 rv
= store_super0(st
, fd
, sb
);
560 if (rv
== 0 && (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
)))
561 rv
= st
->ss
->write_bitmap(st
, fd
, sbv
);
565 fprintf(stderr
, Name
": failed to write superblock to %s\n", devname
);
569 static int compare_super0(void **firstp
, void *secondv
)
573 * 0 same, or first was empty, and second was copied
574 * 1 second had wrong number
578 mdp_super_t
*first
= *firstp
;
579 mdp_super_t
*second
= secondv
;
581 int uuid1
[4], uuid2
[4];
582 if (second
->md_magic
!= MD_SB_MAGIC
)
585 first
= malloc(MD_SB_BYTES
);
586 memcpy(first
, second
, MD_SB_BYTES
);
591 uuid_from_super0(uuid1
, first
);
592 uuid_from_super0(uuid2
, second
);
593 if (!same_uuid(uuid1
, uuid2
, 0))
595 if (first
->major_version
!= second
->major_version
||
596 first
->minor_version
!= second
->minor_version
||
597 first
->patch_version
!= second
->patch_version
||
598 first
->gvalid_words
!= second
->gvalid_words
||
599 first
->ctime
!= second
->ctime
||
600 first
->level
!= second
->level
||
601 first
->size
!= second
->size
||
602 first
->raid_disks
!= second
->raid_disks
)
609 static int load_super0(struct supertype
*st
, int fd
, void **sbp
, char *devname
)
611 /* try to read in the superblock
614 * 1 on cannot get superblock
615 * 2 on superblock meaningless
618 unsigned long long dsize
;
619 unsigned long long offset
;
623 if (ioctl(fd
, BLKGETSIZE64
, &dsize
) != 0)
626 if (ioctl(fd
, BLKGETSIZE
, &size
)) {
628 fprintf(stderr
, Name
": cannot find device size for %s: %s\n",
629 devname
, strerror(errno
));
635 if (dsize
< MD_RESERVED_SECTORS
*2) {
637 fprintf(stderr
, Name
": %s is too small for md: size is %ld sectors.\n",
642 offset
= MD_NEW_SIZE_SECTORS(dsize
>>9);
646 ioctl(fd
, BLKFLSBUF
, 0); /* make sure we read current data */
648 if (lseek64(fd
, offset
, 0)< 0LL) {
650 fprintf(stderr
, Name
": Cannot seek to superblock on %s: %s\n",
651 devname
, strerror(errno
));
655 super
= malloc(MD_SB_BYTES
+ sizeof(bitmap_super_t
));
657 if (read(fd
, super
, sizeof(*super
)) != MD_SB_BYTES
) {
659 fprintf(stderr
, Name
": Cannot read superblock on %s\n",
665 if (st
->ss
&& st
->minor_version
== 9)
666 super0_swap_endian(super
);
668 if (super
->md_magic
!= MD_SB_MAGIC
) {
670 fprintf(stderr
, Name
": No super block found on %s (Expected magic %08x, got %08x)\n",
671 devname
, MD_SB_MAGIC
, super
->md_magic
);
676 if (super
->major_version
!= 0) {
678 fprintf(stderr
, Name
": Cannot interpret superblock on %s - version is %d\n",
679 devname
, super
->major_version
);
684 if (st
->ss
== NULL
) {
686 st
->minor_version
= 90;
687 st
->max_devs
= MD_SB_DISKS
;
693 static struct supertype
*match_metadata_desc0(char *arg
)
695 struct supertype
*st
= malloc(sizeof(*st
));
699 st
->minor_version
= 90;
700 st
->max_devs
= MD_SB_DISKS
;
701 if (strcmp(arg
, "0") == 0 ||
702 strcmp(arg
, "0.90") == 0 ||
703 strcmp(arg
, "default") == 0
707 st
->minor_version
= 9; /* flag for 'byte-swapped' */
708 if (strcmp(arg
, "0.swap")==0)
715 static __u64
avail_size0(struct supertype
*st
, __u64 devsize
)
717 if (devsize
< MD_RESERVED_SECTORS
*2)
719 return MD_NEW_SIZE_SECTORS(devsize
);
722 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
)
725 * The bitmap comes immediately after the superblock and must be 60K in size
726 * at most. The default size is between 30K and 60K
728 * size is in K, chunk is in bytes !!!
730 unsigned long long bits
;
731 unsigned long long max_bits
= 60*1024*8;
732 unsigned long long min_chunk
;
733 mdp_super_t
*sb
= sbv
;
734 bitmap_super_t
*bms
= (bitmap_super_t
*)(((char*)sb
) + MD_SB_BYTES
);
737 min_chunk
= 4096; /* sub-page chunks don't work yet.. */
738 bits
= (size
* 512)/ min_chunk
+1;
739 while (bits
> max_bits
) {
745 else if (chunk
< min_chunk
)
746 return 0; /* chunk size too small */
748 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
750 memset(bms
, 0, sizeof(*bms
));
751 bms
->magic
= __cpu_to_le32(BITMAP_MAGIC
);
752 bms
->version
= __cpu_to_le32(major
);
753 uuid_from_super0((int*)bms
->uuid
, sb
);
754 bms
->chunksize
= __cpu_to_le32(chunk
);
755 bms
->daemon_sleep
= __cpu_to_le32(delay
);
756 bms
->sync_size
= __cpu_to_le64(size
);
757 bms
->write_behind
= __cpu_to_le32(write_behind
);
765 void locate_bitmap0(struct supertype
*st
, int fd
, void *sbv
)
767 unsigned long long dsize
;
769 unsigned long long offset
;
771 if (ioctl(fd
, BLKGETSIZE64
, &dsize
) != 0)
774 if (ioctl(fd
, BLKGETSIZE
, &size
))
777 dsize
= ((unsigned long long)size
)<<9;
780 if (dsize
< MD_RESERVED_SECTORS
*2)
783 offset
= MD_NEW_SIZE_SECTORS(dsize
>>9);
787 offset
+= MD_SB_BYTES
;
789 lseek64(fd
, offset
, 0);
792 int write_bitmap0(struct supertype
*st
, int fd
, void *sbv
)
795 unsigned long long dsize
;
796 unsigned long long offset
;
797 mdp_super_t
*sb
= sbv
;
805 if (ioctl(fd
, BLKGETSIZE64
, &dsize
) != 0)
808 if (ioctl(fd
, BLKGETSIZE
, &size
))
811 dsize
= ((unsigned long long)size
)<<9;
814 if (dsize
< MD_RESERVED_SECTORS
*2)
817 offset
= MD_NEW_SIZE_SECTORS(dsize
>>9);
821 if (lseek64(fd
, offset
+ 4096, 0)< 0LL)
825 if (write(fd
, ((char*)sb
)+MD_SB_BYTES
, sizeof(bitmap_super_t
)) !=
826 sizeof(bitmap_super_t
))
828 towrite
= 64*1024 - MD_SB_BYTES
- sizeof(bitmap_super_t
);
829 memset(buf
, 0xff, sizeof(buf
));
830 while (towrite
> 0) {
834 n
= write(fd
, buf
, n
);
847 struct superswitch super0
= {
849 .examine_super
= examine_super0
,
850 .brief_examine_super
= brief_examine_super0
,
851 .detail_super
= detail_super0
,
852 .brief_detail_super
= brief_detail_super0
,
854 .uuid_from_super
= uuid_from_super0
,
855 .getinfo_super
= getinfo_super0
,
856 .update_super
= update_super0
,
857 .event_super
= event_super0
,
858 .init_super
= init_super0
,
859 .add_to_super
= add_to_super0
,
860 .store_super
= store_super0
,
861 .write_init_super
= write_init_super0
,
862 .compare_super
= compare_super0
,
863 .load_super
= load_super0
,
864 .match_metadata_desc
= match_metadata_desc0
,
865 .avail_size
= avail_size0
,
866 .add_internal_bitmap
= add_internal_bitmap0
,
867 .locate_bitmap
= locate_bitmap0
,
868 .write_bitmap
= write_bitmap0
,