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
32 * The version-1 superblock :
33 * All numeric fields are little-endian.
35 * total size: 256 bytes plus 2 per device.
36 * 1K allows 384 devices.
38 struct mdp_superblock_1
{
39 /* constant array information - 128 bytes */
40 __u32 magic
; /* MD_SB_MAGIC: 0xa92b4efc - little endian */
41 __u32 major_version
; /* 1 */
42 __u32 feature_map
; /* 0 for now */
43 __u32 pad0
; /* always set to 0 when writing */
45 __u8 set_uuid
[16]; /* user-space generated. */
46 char set_name
[32]; /* set and interpreted by user-space */
48 __u64 ctime
; /* lo 40 bits are seconds, top 24 are microseconds or 0*/
49 __u32 level
; /* -4 (multipath), -1 (linear), 0,1,4,5 */
50 __u32 layout
; /* only for raid5 currently */
51 __u64 size
; /* used size of component devices, in 512byte sectors */
53 __u32 chunksize
; /* in 512byte sectors */
55 __u32 bitmap_offset
; /* sectors after start of superblock that bitmap starts
56 * NOTE: signed, so bitmap can be before superblock
57 * only meaningful of feature_map[0] is set.
60 /* These are only valid with feature bit '4' */
61 __u32 new_level
; /* new level we are reshaping to */
62 __u64 reshape_position
; /* next address in array-space for reshape */
63 __u32 delta_disks
; /* change in number of raid_disks */
64 __u32 new_layout
; /* new layout */
65 __u32 new_chunk
; /* new chunk size (bytes) */
66 __u8 pad1
[128-124]; /* set to 0 when written */
68 /* constant this-device information - 64 bytes */
69 __u64 data_offset
; /* sector start of data, often 0 */
70 __u64 data_size
; /* sectors in this device that can be used for data */
71 __u64 super_offset
; /* sector start of this superblock */
72 __u64 recovery_offset
;/* sectors before this offset (from data_offset) have been recovered */
73 __u32 dev_number
; /* permanent identifier of this device - not role in raid */
74 __u32 cnt_corrected_read
; /* number of read errors that were corrected by re-writing */
75 __u8 device_uuid
[16]; /* user-space setable, ignored by kernel */
76 __u8 devflags
; /* per-device flags. Only one defined...*/
77 #define WriteMostly1 1 /* mask for writemostly flag in above */
78 __u8 pad2
[64-57]; /* set to 0 when writing */
80 /* array state information - 64 bytes */
81 __u64 utime
; /* 40 bits second, 24 btes microseconds */
82 __u64 events
; /* incremented when superblock updated */
83 __u64 resync_offset
; /* data before this offset (from data_offset) known to be in sync */
84 __u32 sb_csum
; /* checksum upto devs[max_dev] */
85 __u32 max_dev
; /* size of devs[] array to consider */
86 __u8 pad3
[64-32]; /* set to 0 when writing */
88 /* device state information. Indexed by dev_number.
90 * Note there are no per-device state flags. State information is rolled
91 * into the 'roles' value. If a device is spare or faulty, then it doesn't
92 * have a meaningful role.
94 __u16 dev_roles
[0]; /* role in array, or 0xffff for a spare, or 0xfffe for faulty */
97 /* feature_map bits */
98 #define MD_FEATURE_BITMAP_OFFSET 1
99 #define MD_FEATURE_RECOVERY_OFFSET 2 /* recovery_offset is present and
102 #define MD_FEATURE_RESHAPE_ACTIVE 4
104 #define MD_FEATURE_ALL (1|2|4)
107 #define offsetof(t,f) ((size_t)&(((t*)0)->f))
109 static unsigned int calc_sb_1_csum(struct mdp_superblock_1
* sb
)
111 unsigned int disk_csum
, csum
;
112 unsigned long long newcsum
;
113 int size
= sizeof(*sb
) + __le32_to_cpu(sb
->max_dev
)*2;
114 unsigned int *isuper
= (unsigned int*)sb
;
117 /* make sure I can count... */
118 if (offsetof(struct mdp_superblock_1
,data_offset
) != 128 ||
119 offsetof(struct mdp_superblock_1
, utime
) != 192 ||
120 sizeof(struct mdp_superblock_1
) != 256) {
121 fprintf(stderr
, "WARNING - superblock isn't sized correctly\n");
124 disk_csum
= sb
->sb_csum
;
127 for (i
=0; size
>=4; size
-= 4 ) {
128 newcsum
+= __le32_to_cpu(*isuper
);
133 newcsum
+= __le16_to_cpu(*(unsigned short*) isuper
);
135 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
136 sb
->sb_csum
= disk_csum
;
137 return __cpu_to_le32(csum
);
141 static void examine_super1(void *sbv
, char *homehost
)
143 struct mdp_superblock_1
*sb
= sbv
;
149 int l
= homehost
? strlen(homehost
) : 0;
152 printf(" Magic : %08x\n", __le32_to_cpu(sb
->magic
));
153 printf(" Version : %02d\n", 1);
154 printf(" Feature Map : 0x%x\n", __le32_to_cpu(sb
->feature_map
));
155 printf(" Array UUID : ");
156 for (i
=0; i
<16; i
++) {
157 if ((i
&3)==0 && i
!= 0) printf(":");
158 printf("%02x", sb
->set_uuid
[i
]);
161 printf(" Name : %.32s", sb
->set_name
);
162 if (l
> 0 && l
< 32 &&
163 sb
->set_name
[l
] == ':' &&
164 strncmp(sb
->set_name
, homehost
, l
) == 0)
165 printf(" (local to host %s)", homehost
);
167 atime
= __le64_to_cpu(sb
->ctime
) & 0xFFFFFFFFFFULL
;
168 printf(" Creation Time : %.24s\n", ctime(&atime
));
169 c
=map_num(pers
, __le32_to_cpu(sb
->level
));
170 printf(" Raid Level : %s\n", c
?c
:"-unknown-");
171 printf(" Raid Devices : %d\n", __le32_to_cpu(sb
->raid_disks
));
173 printf(" Device Size : %llu%s\n", (unsigned long long)sb
->data_size
, human_size(sb
->data_size
<<9));
174 if (__le32_to_cpu(sb
->level
) >= 0) {
176 switch(__le32_to_cpu(sb
->level
)) {
177 case 1: ddsks
=1;break;
179 case 5: ddsks
= __le32_to_cpu(sb
->raid_disks
)-1; break;
180 case 6: ddsks
= __le32_to_cpu(sb
->raid_disks
)-2; break;
182 layout
= __le32_to_cpu(sb
->layout
);
183 ddsks
= __le32_to_cpu(sb
->raid_disks
)
184 / (layout
&255) / ((layout
>>8)&255);
187 printf(" Array Size : %llu%s\n",
188 ddsks
*(unsigned long long)__le64_to_cpu(sb
->size
),
189 human_size(ddsks
*__le64_to_cpu(sb
->size
)<<9));
190 if (sb
->size
!= sb
->data_size
)
191 printf(" Used Size : %llu%s\n",
192 (unsigned long long)__le64_to_cpu(sb
->size
),
193 human_size(__le64_to_cpu(sb
->size
)<<9));
196 printf(" Data Offset : %llu sectors\n",
197 (unsigned long long)__le64_to_cpu(sb
->data_offset
));
198 printf(" Super Offset : %llu sectors\n",
199 (unsigned long long)__le64_to_cpu(sb
->super_offset
));
200 if (__le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RECOVERY_OFFSET
)
201 printf("Recovery Offset : %llu sectors\n", (unsigned long long)__le64_to_cpu(sb
->recovery_offset
));
202 printf(" State : %s\n", (__le64_to_cpu(sb
->resync_offset
)+1)? "active":"clean");
203 printf(" Device UUID : ");
204 for (i
=0; i
<16; i
++) {
205 if ((i
&3)==0 && i
!= 0) printf(":");
206 printf("%02x", sb
->device_uuid
[i
]);
210 if (sb
->feature_map
& __cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
)) {
211 printf("Internal Bitmap : %ld sectors from superblock\n",
212 (long)__le32_to_cpu(sb
->bitmap_offset
));
214 if (sb
->feature_map
& __le32_to_cpu(MD_FEATURE_RESHAPE_ACTIVE
)) {
215 printf(" Reshape pos'n : %llu%s\n", (unsigned long long)__le64_to_cpu(sb
->reshape_position
)/2,
216 human_size(__le64_to_cpu(sb
->reshape_position
)<<9));
217 if (__le32_to_cpu(sb
->delta_disks
)) {
218 printf(" Delta Devices : %d", __le32_to_cpu(sb
->delta_disks
));
219 if (__le32_to_cpu(sb
->delta_disks
))
220 printf(" (%d->%d)\n",
221 __le32_to_cpu(sb
->raid_disks
)-__le32_to_cpu(sb
->delta_disks
),
222 __le32_to_cpu(sb
->raid_disks
));
224 printf(" (%d->%d)\n", __le32_to_cpu(sb
->raid_disks
),
225 __le32_to_cpu(sb
->raid_disks
)+__le32_to_cpu(sb
->delta_disks
));
227 if (__le32_to_cpu(sb
->new_level
) != __le32_to_cpu(sb
->level
)) {
228 c
= map_num(pers
, __le32_to_cpu(sb
->new_level
));
229 printf(" New Level : %s\n", c
?c
:"-unknown-");
231 if (__le32_to_cpu(sb
->new_layout
) != __le32_to_cpu(sb
->layout
)) {
232 if (__le32_to_cpu(sb
->level
) == 5) {
233 c
= map_num(r5layout
, __le32_to_cpu(sb
->new_layout
));
234 printf(" New Layout : %s\n", c
?c
:"-unknown-");
236 if (__le32_to_cpu(sb
->level
) == 10) {
237 printf(" New Layout : near=%d, %s=%d\n",
238 __le32_to_cpu(sb
->new_layout
)&255,
239 (__le32_to_cpu(sb
->new_layout
)&0x10000)?"offset":"far",
240 (__le32_to_cpu(sb
->new_layout
)>>8)&255);
243 if (__le32_to_cpu(sb
->new_chunk
) != __le32_to_cpu(sb
->chunksize
))
244 printf(" New Chunksize : %dK\n", __le32_to_cpu(sb
->new_chunk
)/2);
249 if (sb
->devflags
& WriteMostly1
)
250 printf(" write-mostly");
254 atime
= __le64_to_cpu(sb
->utime
) & 0xFFFFFFFFFFULL
;
255 printf(" Update Time : %.24s\n", ctime(&atime
));
257 if (calc_sb_1_csum(sb
) == sb
->sb_csum
)
258 printf(" Checksum : %x - correct\n", __le32_to_cpu(sb
->sb_csum
));
260 printf(" Checksum : %x - expected %x\n", __le32_to_cpu(sb
->sb_csum
),
261 __le32_to_cpu(calc_sb_1_csum(sb
)));
262 printf(" Events : %llu\n", (unsigned long long)__le64_to_cpu(sb
->events
));
264 if (__le32_to_cpu(sb
->level
) == 5) {
265 c
= map_num(r5layout
, __le32_to_cpu(sb
->layout
));
266 printf(" Layout : %s\n", c
?c
:"-unknown-");
268 if (__le32_to_cpu(sb
->level
) == 10) {
269 int lo
= __le32_to_cpu(sb
->layout
);
270 printf(" Layout : near=%d, %s=%d\n",
272 (lo
&0x10000)?"offset":"far",
275 switch(__le32_to_cpu(sb
->level
)) {
281 printf(" Chunk Size : %dK\n", __le32_to_cpu(sb
->chunksize
)/2);
284 printf(" Rounding : %dK\n", __le32_to_cpu(sb
->chunksize
)/2);
289 printf(" Array Slot : %d (", __le32_to_cpu(sb
->dev_number
));
290 for (i
= __le32_to_cpu(sb
->max_dev
); i
> 0 ; i
--)
291 if (__le16_to_cpu(sb
->dev_roles
[i
-1]) != 0xffff)
293 for (d
=0; d
< i
; d
++) {
294 int role
= __le16_to_cpu(sb
->dev_roles
[d
]);
296 if (role
== 0xffff) printf("empty");
297 else if(role
== 0xfffe) printf("failed");
298 else printf("%d", role
);
301 printf(" Array State : ");
302 for (d
=0; d
<__le32_to_cpu(sb
->raid_disks
); d
++) {
306 for (i
=0; i
< __le32_to_cpu(sb
->max_dev
); i
++) {
307 int role
= __le16_to_cpu(sb
->dev_roles
[i
]);
309 if (i
== __le32_to_cpu(sb
->dev_number
))
314 if (cnt
> 1) printf("?");
315 else if (cnt
== 1 && me
) printf("U");
316 else if (cnt
== 1) printf("u");
320 for (i
=0; i
< __le32_to_cpu(sb
->max_dev
); i
++) {
321 int role
= __le16_to_cpu(sb
->dev_roles
[i
]);
325 if (faulty
) printf(" %d failed", faulty
);
330 static void brief_examine_super1(void *sbv
)
332 struct mdp_superblock_1
*sb
= sbv
;
335 char *c
=map_num(pers
, __le32_to_cpu(sb
->level
));
337 nm
= strchr(sb
->set_name
, ':');
340 else if (sb
->set_name
[0])
345 printf("ARRAY /dev/md/%s level=%s metadata=1 num-devices=%d UUID=",
347 c
?c
:"-unknown-", __le32_to_cpu(sb
->raid_disks
));
348 for (i
=0; i
<16; i
++) {
349 if ((i
&3)==0 && i
!= 0) printf(":");
350 printf("%02x", sb
->set_uuid
[i
]);
353 printf(" name=%.32s", sb
->set_name
);
357 static void detail_super1(void *sbv
, char *homehost
)
359 struct mdp_superblock_1
*sb
= sbv
;
361 int l
= homehost
? strlen(homehost
) : 0;
363 printf(" Name : %.32s", sb
->set_name
);
364 if (l
> 0 && l
< 32 &&
365 sb
->set_name
[l
] == ':' &&
366 strncmp(sb
->set_name
, homehost
, l
) == 0)
367 printf(" (local to host %s)", homehost
);
368 printf("\n UUID : ");
369 for (i
=0; i
<16; i
++) {
370 if ((i
&3)==0 && i
!= 0) printf(":");
371 printf("%02x", sb
->set_uuid
[i
]);
373 printf("\n Events : %llu\n\n", (unsigned long long)__le64_to_cpu(sb
->events
));
376 static void brief_detail_super1(void *sbv
)
378 struct mdp_superblock_1
*sb
= sbv
;
382 printf(" name=%.32s", sb
->set_name
);
384 for (i
=0; i
<16; i
++) {
385 if ((i
&3)==0 && i
!= 0) printf(":");
386 printf("%02x", sb
->set_uuid
[i
]);
392 static int match_home1(void *sbv
, char *homehost
)
394 struct mdp_superblock_1
*sb
= sbv
;
395 int l
= homehost
? strlen(homehost
) : 0;
397 return (l
> 0 && l
< 32 &&
398 sb
->set_name
[l
] == ':' &&
399 strncmp(sb
->set_name
, homehost
, l
) == 0);
402 static void uuid_from_super1(int uuid
[4], void * sbv
)
404 struct mdp_superblock_1
*super
= sbv
;
405 char *cuuid
= (char*)uuid
;
408 cuuid
[i
] = super
->set_uuid
[i
];
411 static void getinfo_super1(struct mdinfo
*info
, void *sbv
)
413 struct mdp_superblock_1
*sb
= sbv
;
418 info
->array
.major_version
= 1;
419 info
->array
.minor_version
= __le32_to_cpu(sb
->feature_map
);
420 info
->array
.patch_version
= 0;
421 info
->array
.raid_disks
= __le32_to_cpu(sb
->raid_disks
);
422 info
->array
.level
= __le32_to_cpu(sb
->level
);
423 info
->array
.layout
= __le32_to_cpu(sb
->layout
);
424 info
->array
.md_minor
= -1;
425 info
->array
.ctime
= __le64_to_cpu(sb
->ctime
);
426 info
->array
.utime
= __le64_to_cpu(sb
->utime
);
427 info
->array
.chunk_size
= __le32_to_cpu(sb
->chunksize
)*512;
429 info
->data_offset
= __le64_to_cpu(sb
->data_offset
);
430 info
->component_size
= __le64_to_cpu(sb
->size
);
432 info
->disk
.major
= 0;
433 info
->disk
.minor
= 0;
434 info
->disk
.number
= __le32_to_cpu(sb
->dev_number
);
435 if (__le32_to_cpu(sb
->dev_number
) >= __le32_to_cpu(sb
->max_dev
) ||
436 __le32_to_cpu(sb
->max_dev
) > 512)
439 role
= __le16_to_cpu(sb
->dev_roles
[__le32_to_cpu(sb
->dev_number
)]);
441 info
->disk
.raid_disk
= -1;
444 info
->disk
.state
= 2; /* spare: ACTIVE, not sync, not faulty */
447 info
->disk
.state
= 1; /* faulty */
450 info
->disk
.state
= 6; /* active and in sync */
451 info
->disk
.raid_disk
= role
;
453 info
->events
= __le64_to_cpu(sb
->events
);
455 memcpy(info
->uuid
, sb
->set_uuid
, 16);
457 strncpy(info
->name
, sb
->set_name
, 32);
460 if (sb
->feature_map
& __le32_to_cpu(MD_FEATURE_RESHAPE_ACTIVE
)) {
461 info
->reshape_active
= 1;
462 info
->reshape_progress
= __le64_to_cpu(sb
->reshape_position
);
463 info
->new_level
= __le32_to_cpu(sb
->new_level
);
464 info
->delta_disks
= __le32_to_cpu(sb
->delta_disks
);
465 info
->new_layout
= __le32_to_cpu(sb
->new_layout
);
466 info
->new_chunk
= __le32_to_cpu(sb
->new_chunk
)<<9;
468 info
->reshape_active
= 0;
470 for (i
=0; i
< __le32_to_cpu(sb
->max_dev
); i
++) {
471 role
= __le16_to_cpu(sb
->dev_roles
[i
]);
472 if (/*role == 0xFFFF || */role
< info
->array
.raid_disks
)
476 info
->array
.working_disks
= working
;
479 static int update_super1(struct mdinfo
*info
, void *sbv
, char *update
,
480 char *devname
, int verbose
,
481 int uuid_set
, char *homehost
)
483 /* NOTE: for 'assemble' and 'force' we need to return non-zero if any change was made.
484 * For others, the return value is ignored.
487 struct mdp_superblock_1
*sb
= sbv
;
489 if (strcmp(update
, "force-one")==0) {
490 /* Not enough devices for a working array,
491 * so bring this one up-to-date
493 if (sb
->events
!= __cpu_to_le64(info
->events
))
495 sb
->events
= __cpu_to_le64(info
->events
);
497 if (strcmp(update
, "force-array")==0) {
498 /* Degraded array and 'force' requests to
499 * maybe need to mark it 'clean'.
501 switch(__le32_to_cpu(sb
->level
)) {
502 case 5: case 4: case 6:
503 /* need to force clean */
504 if (sb
->resync_offset
!= ~0ULL)
506 sb
->resync_offset
= ~0ULL;
509 if (strcmp(update
, "assemble")==0) {
510 int d
= info
->disk
.number
;
512 if (info
->disk
.state
== 6)
513 want
= __cpu_to_le32(info
->disk
.raid_disk
);
516 if (sb
->dev_roles
[d
] != want
) {
517 sb
->dev_roles
[d
] = want
;
521 if (strcmp(update
, "grow") == 0) {
522 sb
->raid_disks
= __cpu_to_le32(info
->array
.raid_disks
);
525 if (strcmp(update
, "resync") == 0) {
526 /* make sure resync happens */
527 sb
->resync_offset
= 0ULL;
529 if (strcmp(update
, "uuid") == 0) {
530 memcpy(sb
->set_uuid
, info
->uuid
, 16);
531 if (__le32_to_cpu(sb
->feature_map
)&MD_FEATURE_BITMAP_OFFSET
) {
532 struct bitmap_super_s
*bm
;
533 bm
= (struct bitmap_super_s
*)(sbv
+1024);
534 memcpy(bm
->uuid
, info
->uuid
, 16);
537 if (strcmp(update
, "homehost") == 0 &&
541 c
= strchr(sb
->set_name
, ':');
543 strncpy(info
->name
, c
+1, 31 - (c
-sb
->set_name
));
545 strncpy(info
->name
, sb
->set_name
, 32);
548 if (strcmp(update
, "name") == 0) {
549 if (info
->name
[0] == 0)
550 sprintf(info
->name
, "%d", info
->array
.md_minor
);
551 memset(sb
->set_name
, 0, sizeof(sb
->set_name
));
553 strchr(info
->name
, ':') == NULL
&&
554 strlen(homehost
)+1+strlen(info
->name
) < 32) {
555 strcpy(sb
->set_name
, homehost
);
556 strcat(sb
->set_name
, ":");
557 strcat(sb
->set_name
, info
->name
);
559 strcpy(sb
->set_name
, info
->name
);
561 if (strcmp(update
, "_reshape_progress")==0)
562 sb
->reshape_position
= __cpu_to_le64(info
->reshape_progress
);
564 sb
->sb_csum
= calc_sb_1_csum(sb
);
568 static int init_super1(struct supertype
*st
, void **sbp
, mdu_array_info_t
*info
,
569 unsigned long long size
, char *name
, char *homehost
)
571 struct mdp_superblock_1
*sb
= malloc(1024 + sizeof(bitmap_super_t
));
577 if (info
->major_version
== -1) {
578 /* zeroing superblock */
583 spares
= info
->working_disks
- info
->active_disks
;
584 if (info
->raid_disks
+ spares
> 384) {
585 fprintf(stderr
, Name
": too many devices requested: %d+%d > %d\n",
586 info
->raid_disks
, spares
, 384);
590 sb
->magic
= __cpu_to_le32(MD_SB_MAGIC
);
591 sb
->major_version
= __cpu_to_le32(1);
595 if ((rfd
= open("/dev/urandom", O_RDONLY
)) < 0 ||
596 read(rfd
, sb
->set_uuid
, 16) != 16) {
597 *(__u32
*)(sb
->set_uuid
) = random();
598 *(__u32
*)(sb
->set_uuid
+4) = random();
599 *(__u32
*)(sb
->set_uuid
+8) = random();
600 *(__u32
*)(sb
->set_uuid
+12) = random();
602 if (rfd
>= 0) close(rfd
);
604 if (name
== NULL
|| *name
== 0) {
605 sprintf(defname
, "%d", info
->md_minor
);
608 memset(sb
->set_name
, 0, 32);
610 strchr(name
, ':')== NULL
&&
611 strlen(homehost
)+1+strlen(name
) < 32) {
612 strcpy(sb
->set_name
, homehost
);
613 strcat(sb
->set_name
, ":");
614 strcat(sb
->set_name
, name
);
616 strcpy(sb
->set_name
, name
);
618 sb
->ctime
= __cpu_to_le64((unsigned long long)time(0));
619 sb
->level
= __cpu_to_le32(info
->level
);
620 sb
->layout
= __cpu_to_le32(info
->layout
);
621 sb
->size
= __cpu_to_le64(size
*2ULL);
622 sb
->chunksize
= __cpu_to_le32(info
->chunk_size
>>9);
623 sb
->raid_disks
= __cpu_to_le32(info
->raid_disks
);
625 sb
->data_offset
= __cpu_to_le64(0);
626 sb
->data_size
= __cpu_to_le64(0);
627 sb
->super_offset
= __cpu_to_le64(0);
628 sb
->recovery_offset
= __cpu_to_le64(0);
630 sb
->utime
= sb
->ctime
;
631 sb
->events
= __cpu_to_le64(1);
632 if (info
->state
& (1<<MD_SB_CLEAN
))
633 sb
->resync_offset
= ~0ULL;
635 sb
->resync_offset
= 0;
636 sb
->max_dev
= __cpu_to_le32((1024- sizeof(struct mdp_superblock_1
))/
637 sizeof(sb
->dev_roles
[0]));
638 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
640 memset(sb
->dev_roles
, 0xff, 1024 - sizeof(struct mdp_superblock_1
));
646 /* Add a device to the superblock being created */
647 static void add_to_super1(void *sbv
, mdu_disk_info_t
*dk
)
649 struct mdp_superblock_1
*sb
= sbv
;
650 __u16
*rp
= sb
->dev_roles
+ dk
->number
;
651 if ((dk
->state
& 6) == 6) /* active, sync */
652 *rp
= __cpu_to_le16(dk
->raid_disk
);
653 else if ((dk
->state
& ~2) == 0) /* active or idle -> spare */
659 static void locate_bitmap1(struct supertype
*st
, int fd
, void *sbv
);
661 static int store_super1(struct supertype
*st
, int fd
, void *sbv
)
663 struct mdp_superblock_1
*sb
= sbv
;
664 unsigned long long sb_offset
;
667 unsigned long long dsize
;
670 if (ioctl(fd
, BLKGETSIZE64
, &dsize
) != 0)
673 if (ioctl(fd
, BLKGETSIZE
, &size
))
676 dsize
= (unsigned long long)size
;
684 * Calculate the position of the superblock.
685 * It is always aligned to a 4K boundary and
686 * depending on minor_version, it can be:
687 * 0: At least 8K, but less than 12K, from end of device
688 * 1: At start of device
689 * 2: 4K from start of device.
691 switch(st
->minor_version
) {
695 sb_offset
&= ~(4*2-1);
709 if (sb_offset
!= __le64_to_cpu(sb
->super_offset
) &&
710 0 != __le64_to_cpu(sb
->super_offset
)
712 fprintf(stderr
, Name
": internal error - sb_offset is wrong\n");
716 if (lseek64(fd
, sb_offset
<< 9, 0)< 0LL)
719 sbsize
= sizeof(*sb
) + 2 * __le32_to_cpu(sb
->max_dev
);
721 if (write(fd
, sb
, sbsize
) != sbsize
)
724 if (sb
->feature_map
& __cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
)) {
725 struct bitmap_super_s
*bm
= (struct bitmap_super_s
*)
727 if (__le32_to_cpu(bm
->magic
) == BITMAP_MAGIC
) {
728 locate_bitmap1(st
, fd
, sbv
);
729 if (write(fd
, bm
, sizeof(*bm
)) != sizeof(*bm
))
737 static int load_super1(struct supertype
*st
, int fd
, void **sbp
, char *devname
);
739 static int write_init_super1(struct supertype
*st
, void *sbv
,
740 mdu_disk_info_t
*dinfo
, char *devname
)
742 struct mdp_superblock_1
*sb
= sbv
;
744 int fd
= open(devname
, O_RDWR
| O_EXCL
);
750 unsigned long long dsize
, array_size
;
755 fprintf(stderr
, Name
": Failed to open %s to write superblock\n",
760 sb
->dev_number
= __cpu_to_le32(dinfo
->number
);
761 if (dinfo
->state
& (1<<MD_DISK_WRITEMOSTLY
))
762 sb
->devflags
|= __cpu_to_le32(WriteMostly1
);
764 if ((rfd
= open("/dev/urandom", O_RDONLY
)) < 0 ||
765 read(rfd
, sb
->device_uuid
, 16) != 16) {
766 *(__u32
*)(sb
->device_uuid
) = random();
767 *(__u32
*)(sb
->device_uuid
+4) = random();
768 *(__u32
*)(sb
->device_uuid
+8) = random();
769 *(__u32
*)(sb
->device_uuid
+12) = random();
771 if (rfd
>= 0) close(rfd
);
774 if (load_super1(st
, fd
, &refsbv
, NULL
)==0) {
775 struct mdp_superblock_1
*refsb
= refsbv
;
777 memcpy(sb
->device_uuid
, refsb
->device_uuid
, 16);
778 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16)==0) {
779 /* same array, so preserve events and dev_number */
780 sb
->events
= refsb
->events
;
781 /* bugs in 2.6.17 and earlier mean the dev_number
782 * chosen in Manage must be preserved
784 if (get_linux_version() >= 2006018)
785 sb
->dev_number
= refsb
->dev_number
;
791 if (ioctl(fd
, BLKGETSIZE64
, &dsize
) != 0)
795 if (ioctl(fd
, BLKGETSIZE
, &size
))
809 * Calculate the position of the superblock.
810 * It is always aligned to a 4K boundary and
811 * depending on minor_version, it can be:
812 * 0: At least 8K, but less than 12K, from end of device
813 * 1: At start of device
814 * 2: 4K from start of device.
815 * Depending on the array size, we might leave extra space
818 array_size
= __le64_to_cpu(sb
->size
);
819 /* work out how much space we left of a bitmap */
820 if (array_size
>= 200*1024*1024*2)
822 else if (array_size
> 8*1024*1024*2)
827 switch(st
->minor_version
) {
831 sb_offset
&= ~(4*2-1);
832 sb
->super_offset
= __cpu_to_le64(sb_offset
);
833 sb
->data_offset
= __cpu_to_le64(0);
834 sb
->data_size
= __cpu_to_le64(sb_offset
- bm_space
);
837 sb
->super_offset
= __cpu_to_le64(0);
838 sb
->data_offset
= __cpu_to_le64(bm_space
+ 4*2);
839 sb
->data_size
= __cpu_to_le64(dsize
- bm_space
- 4*2);
843 if (dsize
- 4*2 - 64*2 >= array_size
&& array_size
> 8*1024*1024*2)
847 sb
->super_offset
= __cpu_to_le64(4*2);
848 sb
->data_offset
= __cpu_to_le64(4*2 + 4*2 + bm_space
);
849 sb
->data_size
= __cpu_to_le64(dsize
- 4*2 - 4*2 - bm_space
);
856 sb
->sb_csum
= calc_sb_1_csum(sb
);
857 rv
= store_super1(st
, fd
, sb
);
859 fprintf(stderr
, Name
": failed to write superblock to %s\n", devname
);
861 if (rv
== 0 && (__le32_to_cpu(sb
->feature_map
) & 1))
862 rv
= st
->ss
->write_bitmap(st
, fd
, sbv
);
867 static int compare_super1(void **firstp
, void *secondv
)
871 * 0 same, or first was empty, and second was copied
872 * 1 second had wrong number
876 struct mdp_superblock_1
*first
= *firstp
;
877 struct mdp_superblock_1
*second
= secondv
;
879 if (second
->magic
!= __cpu_to_le32(MD_SB_MAGIC
))
881 if (second
->major_version
!= __cpu_to_le32(1))
885 first
= malloc(1024+sizeof(bitmap_super_t
));
886 memcpy(first
, second
, 1024+sizeof(bitmap_super_t
));
890 if (memcmp(first
->set_uuid
, second
->set_uuid
, 16)!= 0)
893 if (first
->ctime
!= second
->ctime
||
894 first
->level
!= second
->level
||
895 first
->layout
!= second
->layout
||
896 first
->size
!= second
->size
||
897 first
->chunksize
!= second
->chunksize
||
898 first
->raid_disks
!= second
->raid_disks
)
903 static int load_super1(struct supertype
*st
, int fd
, void **sbp
, char *devname
)
906 unsigned long long dsize
;
907 unsigned long long sb_offset
;
908 struct mdp_superblock_1
*super
;
910 struct bitmap_super_s
*bsb
;
913 if (st
->ss
== NULL
) {
916 /* guess... choose latest ctime */
918 for (st
->minor_version
= 0; st
->minor_version
<= 2 ; st
->minor_version
++) {
919 switch(load_super1(st
, fd
, sbp
, devname
)) {
920 case 0: super
= *sbp
;
921 if (bestvers
== -1 ||
922 bestctime
< __le64_to_cpu(super
->ctime
)) {
923 bestvers
= st
->minor_version
;
924 bestctime
= __le64_to_cpu(super
->ctime
);
929 case 1: st
->ss
= NULL
; return 1; /*bad device */
930 case 2: break; /* bad, try next */
933 if (bestvers
!= -1) {
935 st
->minor_version
= bestvers
;
938 rv
= load_super1(st
, fd
, sbp
, devname
);
939 if (rv
) st
->ss
= NULL
;
946 if (ioctl(fd
, BLKGETSIZE64
, &dsize
) != 0)
949 if (ioctl(fd
, BLKGETSIZE
, &size
)) {
951 fprintf(stderr
, Name
": cannot find device size for %s: %s\n",
952 devname
, strerror(errno
));
961 fprintf(stderr
, Name
": %s is too small for md: size is %llu sectors.\n",
967 * Calculate the position of the superblock.
968 * It is always aligned to a 4K boundary and
969 * depending on minor_version, it can be:
970 * 0: At least 8K, but less than 12K, from end of device
971 * 1: At start of device
972 * 2: 4K from start of device.
974 switch(st
->minor_version
) {
978 sb_offset
&= ~(4*2-1);
990 ioctl(fd
, BLKFLSBUF
, 0); /* make sure we read current data */
993 if (lseek64(fd
, sb_offset
<< 9, 0)< 0LL) {
995 fprintf(stderr
, Name
": Cannot seek to superblock on %s: %s\n",
996 devname
, strerror(errno
));
1000 super
= malloc(1024 + sizeof(bitmap_super_t
));
1002 if (read(fd
, super
, 1024) != 1024) {
1004 fprintf(stderr
, Name
": Cannot read superblock on %s\n",
1010 if (__le32_to_cpu(super
->magic
) != MD_SB_MAGIC
) {
1012 fprintf(stderr
, Name
": No super block found on %s (Expected magic %08x, got %08x)\n",
1013 devname
, MD_SB_MAGIC
, __le32_to_cpu(super
->magic
));
1018 if (__le32_to_cpu(super
->major_version
) != 1) {
1020 fprintf(stderr
, Name
": Cannot interpret superblock on %s - version is %d\n",
1021 devname
, __le32_to_cpu(super
->major_version
));
1025 if (__le64_to_cpu(super
->super_offset
) != sb_offset
) {
1027 fprintf(stderr
, Name
": No superblock found on %s (super_offset is wrong)\n",
1034 /* Now check on the bitmap superblock */
1035 if ((__le32_to_cpu(super
->feature_map
)&MD_FEATURE_BITMAP_OFFSET
) == 0)
1037 /* Read the bitmap superblock and make sure it looks
1038 * valid. If it doesn't clear the bit. An --assemble --force
1039 * should get that written out.
1041 locate_bitmap1(st
, fd
, super
);
1042 if (read(fd
, ((char*)super
)+1024, sizeof(struct bitmap_super_s
))
1043 != sizeof(struct bitmap_super_s
))
1046 uuid_from_super1(uuid
, super
);
1047 bsb
= (struct bitmap_super_s
*)(((char*)super
)+1024);
1048 if (__le32_to_cpu(bsb
->magic
) != BITMAP_MAGIC
||
1049 memcmp(bsb
->uuid
, uuid
, 16) != 0)
1054 super
->feature_map
= __cpu_to_le32(__le32_to_cpu(super
->feature_map
) & ~1);
1059 static struct supertype
*match_metadata_desc1(char *arg
)
1061 struct supertype
*st
= malloc(sizeof(*st
));
1066 if (strcmp(arg
, "1") == 0 ||
1067 strcmp(arg
, "1.0") == 0 ||
1068 strcmp(arg
, "default/large") == 0) {
1069 st
->minor_version
= 0;
1072 if (strcmp(arg
, "1.1") == 0) {
1073 st
->minor_version
= 1;
1076 if (strcmp(arg
, "1.2") == 0) {
1077 st
->minor_version
= 2;
1085 /* find available size on device with this devsize, using
1086 * superblock type st, and reserving 'reserve' sectors for
1089 static __u64
avail_size1(struct supertype
*st
, __u64 devsize
)
1094 /* if the device is bigger than 8Gig, save 64k for bitmap usage,
1095 * if bigger than 200Gig, save 128k
1097 if (devsize
-64*2 >= 200*1024*1024*2)
1099 else if (devsize
>= 8*1024*1024*2)
1102 switch(st
->minor_version
) {
1105 return ((devsize
- 8*2 ) & ~(4*2-1));
1107 /* at start, 4K for superblock and possible bitmap */
1108 return devsize
- 4*2;
1110 /* 4k from start, 4K for superblock and possible bitmap */
1111 return devsize
- (4+4)*2;
1117 add_internal_bitmap1(struct supertype
*st
, void *sbv
,
1118 int *chunkp
, int delay
, int write_behind
,
1119 unsigned long long size
,
1120 int may_change
, int major
)
1123 * If not may_change, then this is a 'Grow', and the bitmap
1124 * must fit after the superblock.
1125 * If may_change, then this is create, and we can put the bitmap
1126 * before the superblock if we like, or may move the start.
1127 * If !may_change, the bitmap MUST live at offset of 1K, until
1128 * we get a sysfs interface.
1130 * size is in sectors, chunk is in bytes !!!
1133 unsigned long long bits
;
1134 unsigned long long max_bits
;
1135 unsigned long long min_chunk
;
1137 int chunk
= *chunkp
;
1139 struct mdp_superblock_1
*sb
= sbv
;
1140 bitmap_super_t
*bms
= (bitmap_super_t
*)(((char*)sb
) + 1024);
1142 switch(st
->minor_version
) {
1144 /* either 3K after the superblock, or some amount of space
1148 /* We are creating array, so we *know* how much room has
1152 if (__le64_to_cpu(sb
->size
) >= 200*1024*1024*2)
1154 else if (__le64_to_cpu(sb
->size
) > 8*1024*1024*2)
1161 room
= __le64_to_cpu(sb
->super_offset
)
1162 - __le64_to_cpu(sb
->data_offset
)
1163 - __le64_to_cpu(sb
->data_size
);
1164 /* remove '1 ||' when we can set offset via sysfs */
1165 if (1 || (room
< 3*2 &&
1166 __le32_to_cpu(sb
->max_dev
) <= 384)) {
1170 offset
= 0; /* means movable offset */
1175 case 2: /* between superblock and data */
1178 if (__le64_to_cpu(sb
->size
) >= 200*1024*1024*2)
1180 else if (__le64_to_cpu(sb
->size
) > 8*1024*1024*2)
1185 room
= __le64_to_cpu(sb
->data_offset
)
1186 - __le64_to_cpu(sb
->super_offset
);
1187 if (1 || __le32_to_cpu(sb
->max_dev
) <= 384) {
1198 if (chunk
== UnSet
&& room
> 128*2)
1199 /* Limit to 128K of bitmap when chunk size not requested */
1202 max_bits
= (room
* 512 - sizeof(bitmap_super_t
)) * 8;
1204 min_chunk
= 4096; /* sub-page chunks don't work yet.. */
1205 bits
= (size
*512)/min_chunk
+1;
1206 while (bits
> max_bits
) {
1212 else if (chunk
< min_chunk
)
1213 return 0; /* chunk size too small */
1214 if (chunk
== 0) /* rounding problem */
1218 bits
= (size
*512) / chunk
+ 1;
1219 room
= ((bits
+7)/8 + sizeof(bitmap_super_t
) +511)/512;
1223 sb
->bitmap_offset
= __cpu_to_le32(offset
);
1225 sb
->feature_map
= __cpu_to_le32(__le32_to_cpu(sb
->feature_map
) | 1);
1226 memset(bms
, 0, sizeof(*bms
));
1227 bms
->magic
= __cpu_to_le32(BITMAP_MAGIC
);
1228 bms
->version
= __cpu_to_le32(major
);
1229 uuid_from_super1((int*)bms
->uuid
, sb
);
1230 bms
->chunksize
= __cpu_to_le32(chunk
);
1231 bms
->daemon_sleep
= __cpu_to_le32(delay
);
1232 bms
->sync_size
= __cpu_to_le64(size
);
1233 bms
->write_behind
= __cpu_to_le32(write_behind
);
1240 static void locate_bitmap1(struct supertype
*st
, int fd
, void *sbv
)
1242 unsigned long long offset
;
1243 struct mdp_superblock_1
*sb
;
1247 if (st
->ss
->load_super(st
, fd
, &sbv
, NULL
))
1248 return; /* no error I hope... */
1253 offset
= __le64_to_cpu(sb
->super_offset
);
1254 offset
+= (long) __le32_to_cpu(sb
->bitmap_offset
);
1257 lseek64(fd
, offset
<<9, 0);
1260 static int write_bitmap1(struct supertype
*st
, int fd
, void *sbv
)
1262 struct mdp_superblock_1
*sb
= sbv
;
1263 bitmap_super_t
*bms
= (bitmap_super_t
*)(((char*)sb
)+1024);
1269 locate_bitmap1(st
, fd
, sbv
);
1271 if (write(fd
, ((char*)sb
)+1024, sizeof(bitmap_super_t
)) !=
1272 sizeof(bitmap_super_t
))
1274 towrite
= __le64_to_cpu(bms
->sync_size
) / (__le32_to_cpu(bms
->chunksize
)>>9);
1275 towrite
= (towrite
+7) >> 3; /* bits to bytes */
1276 memset(buf
, 0xff, sizeof(buf
));
1277 while (towrite
> 0) {
1279 if (n
> sizeof(buf
))
1281 n
= write(fd
, buf
, n
);
1294 struct superswitch super1
= {
1296 .examine_super
= examine_super1
,
1297 .brief_examine_super
= brief_examine_super1
,
1298 .detail_super
= detail_super1
,
1299 .brief_detail_super
= brief_detail_super1
,
1301 .match_home
= match_home1
,
1302 .uuid_from_super
= uuid_from_super1
,
1303 .getinfo_super
= getinfo_super1
,
1304 .update_super
= update_super1
,
1305 .init_super
= init_super1
,
1306 .add_to_super
= add_to_super1
,
1307 .store_super
= store_super1
,
1308 .write_init_super
= write_init_super1
,
1309 .compare_super
= compare_super1
,
1310 .load_super
= load_super1
,
1311 .match_metadata_desc
= match_metadata_desc1
,
1312 .avail_size
= avail_size1
,
1313 .add_internal_bitmap
= add_internal_bitmap1
,
1314 .locate_bitmap
= locate_bitmap1
,
1315 .write_bitmap
= write_bitmap1
,
1317 #if __BYTE_ORDER == BIG_ENDIAN