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
;
141 static void examine_super1(void *sbv
, char *homehost
)
143 struct mdp_superblock_1
*sb
= sbv
;
149 int l
= homehost
? strlen(homehost
) : 0;
151 printf(" Magic : %08x\n", __le32_to_cpu(sb
->magic
));
152 printf(" Version : %02d\n", 1);
153 printf(" Feature Map : 0x%x\n", __le32_to_cpu(sb
->feature_map
));
154 printf(" Array UUID : ");
155 for (i
=0; i
<16; i
++) {
156 if ((i
&3)==0 && i
!= 0) printf(":");
157 printf("%02x", sb
->set_uuid
[i
]);
160 printf(" Name : %.32s", sb
->set_name
);
161 if (l
> 0 && l
< 32 &&
162 sb
->set_name
[l
] == ':' &&
163 strncmp(sb
->set_name
, homehost
, l
) == 0)
164 printf(" (local to host %s)", homehost
);
166 atime
= __le64_to_cpu(sb
->ctime
) & 0xFFFFFFFFFFULL
;
167 printf(" Creation Time : %.24s\n", ctime(&atime
));
168 c
=map_num(pers
, __le32_to_cpu(sb
->level
));
169 printf(" Raid Level : %s\n", c
?c
:"-unknown-");
170 printf(" Raid Devices : %d\n", __le32_to_cpu(sb
->raid_disks
));
172 printf(" Device Size : %llu%s\n", (unsigned long long)sb
->data_size
, human_size(sb
->data_size
<<9));
173 if (__le32_to_cpu(sb
->level
) >= 0) {
175 switch(__le32_to_cpu(sb
->level
)) {
176 case 1: ddsks
=1;break;
178 case 5: ddsks
= sb
->raid_disks
-1; break;
179 case 6: ddsks
= sb
->raid_disks
-2; break;
180 case 10: ddsks
= sb
->raid_disks
/ (sb
->layout
&255) / ((sb
->layout
>>8)&255);
183 printf(" Array Size : %llu%s\n", ddsks
*(unsigned long long)sb
->size
, human_size(ddsks
*sb
->size
<<9));
184 if (sb
->size
!= sb
->data_size
)
185 printf(" Used Size : %llu%s\n", (unsigned long long)sb
->size
, human_size(sb
->size
<<9));
188 printf(" Data Offset : %llu sectors\n", (unsigned long long)__le64_to_cpu(sb
->data_offset
));
189 if (sb
->super_offset
)
190 printf(" Super Offset : %llu sectors\n", (unsigned long long)__le64_to_cpu(sb
->super_offset
));
191 if (__le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RECOVERY_OFFSET
)
192 printf("Recovery Offset : %llu sectors\n", (unsigned long long)__le64_to_cpu(sb
->recovery_offset
));
193 printf(" State : %s\n", (__le64_to_cpu(sb
->resync_offset
)+1)? "active":"clean");
194 printf(" Device UUID : ");
195 for (i
=0; i
<16; i
++) {
196 if ((i
&3)==0 && i
!= 0) printf(":");
197 printf("%02x", sb
->device_uuid
[i
]);
201 if (sb
->feature_map
& __cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
)) {
202 printf("Internal Bitmap : %ld sectors from superblock\n",
203 (long)__le32_to_cpu(sb
->bitmap_offset
));
205 if (sb
->feature_map
& __le32_to_cpu(MD_FEATURE_RESHAPE_ACTIVE
)) {
206 printf(" Reshape pos'n : %llu%s\n", (unsigned long long)__le64_to_cpu(sb
->reshape_position
)/2,
207 human_size(__le64_to_cpu(sb
->reshape_position
)<<9));
208 if (__le32_to_cpu(sb
->delta_disks
)) {
209 printf(" Delta Devices : %d", __le32_to_cpu(sb
->delta_disks
));
210 if (__le32_to_cpu(sb
->delta_disks
))
211 printf(" (%d->%d)\n",
212 __le32_to_cpu(sb
->raid_disks
)-__le32_to_cpu(sb
->delta_disks
),
213 __le32_to_cpu(sb
->raid_disks
));
215 printf(" (%d->%d)\n", __le32_to_cpu(sb
->raid_disks
),
216 __le32_to_cpu(sb
->raid_disks
)+__le32_to_cpu(sb
->delta_disks
));
218 if (__le32_to_cpu(sb
->new_level
) != __le32_to_cpu(sb
->level
)) {
219 c
= map_num(pers
, __le32_to_cpu(sb
->new_level
));
220 printf(" New Level : %s\n", c
?c
:"-unknown-");
222 if (__le32_to_cpu(sb
->new_layout
) != __le32_to_cpu(sb
->layout
)) {
223 if (__le32_to_cpu(sb
->level
) == 5) {
224 c
= map_num(r5layout
, __le32_to_cpu(sb
->new_layout
));
225 printf(" New Layout : %s\n", c
?c
:"-unknown-");
227 if (__le32_to_cpu(sb
->level
) == 10) {
228 printf(" New Layout : near=%d, %s=%d\n",
229 __le32_to_cpu(sb
->new_layout
)&255,
230 (__le32_to_cpu(sb
->new_layout
)&0x10000)?"offset":"far",
231 (__le32_to_cpu(sb
->new_layout
)>>8)&255);
234 if (__le32_to_cpu(sb
->new_chunk
) != __le32_to_cpu(sb
->chunksize
))
235 printf(" New Chunksize : %dK\n", __le32_to_cpu(sb
->new_chunk
)/2);
240 if (sb
->devflags
& WriteMostly1
)
241 printf(" write-mostly");
245 atime
= __le64_to_cpu(sb
->utime
) & 0xFFFFFFFFFFULL
;
246 printf(" Update Time : %.24s\n", ctime(&atime
));
248 if (calc_sb_1_csum(sb
) == sb
->sb_csum
)
249 printf(" Checksum : %x - correct\n", __le32_to_cpu(sb
->sb_csum
));
251 printf(" Checksum : %x - expected %x\n", __le32_to_cpu(sb
->sb_csum
),
252 __le32_to_cpu(calc_sb_1_csum(sb
)));
253 printf(" Events : %llu\n", (unsigned long long)__le64_to_cpu(sb
->events
));
255 if (__le32_to_cpu(sb
->level
) == 5) {
256 c
= map_num(r5layout
, __le32_to_cpu(sb
->layout
));
257 printf(" Layout : %s\n", c
?c
:"-unknown-");
259 if (__le32_to_cpu(sb
->level
) == 10) {
260 int lo
= __le32_to_cpu(sb
->layout
);
261 printf(" Layout : near=%d, %s=%d\n",
263 (lo
&0x10000)?"offset":"far",
266 switch(__le32_to_cpu(sb
->level
)) {
272 printf(" Chunk Size : %dK\n", __le32_to_cpu(sb
->chunksize
)/2);
275 printf(" Rounding : %dK\n", __le32_to_cpu(sb
->chunksize
)/2);
280 printf(" Array Slot : %d (", __le32_to_cpu(sb
->dev_number
));
281 for (i
= __le32_to_cpu(sb
->max_dev
); i
> 0 ; i
--)
282 if (__le16_to_cpu(sb
->dev_roles
[i
-1]) != 0xffff)
284 for (d
=0; d
< i
; d
++) {
285 int role
= __le16_to_cpu(sb
->dev_roles
[d
]);
287 if (role
== 0xffff) printf("empty");
288 else if(role
== 0xfffe) printf("failed");
289 else printf("%d", role
);
292 printf(" Array State : ");
293 for (d
=0; d
<__le32_to_cpu(sb
->raid_disks
); d
++) {
297 for (i
=0; i
< __le32_to_cpu(sb
->max_dev
); i
++) {
298 int role
= __le16_to_cpu(sb
->dev_roles
[i
]);
300 if (i
== __le32_to_cpu(sb
->dev_number
))
305 if (cnt
> 1) printf("?");
306 else if (cnt
== 1 && me
) printf("U");
307 else if (cnt
== 1) printf("u");
311 for (i
=0; i
< __le32_to_cpu(sb
->max_dev
); i
++) {
312 int role
= __le16_to_cpu(sb
->dev_roles
[i
]);
316 if (faulty
) printf(" %d failed", faulty
);
321 static void brief_examine_super1(void *sbv
)
323 struct mdp_superblock_1
*sb
= sbv
;
326 char *c
=map_num(pers
, __le32_to_cpu(sb
->level
));
328 nm
= strchr(sb
->set_name
, ':');
331 else if (sb
->set_name
[0])
336 printf("ARRAY /dev/md/%s level=%s metadata=1 num-devices=%d UUID=",
338 c
?c
:"-unknown-", sb
->raid_disks
);
339 for (i
=0; i
<16; i
++) {
340 printf("%02x", sb
->set_uuid
[i
]);
341 if ((i
&3)==0 && i
!= 0) printf(":");
344 printf(" name=%.32s", sb
->set_name
);
348 static void detail_super1(void *sbv
, char *homehost
)
350 struct mdp_superblock_1
*sb
= sbv
;
352 int l
= homehost
? strlen(homehost
) : 0;
354 printf(" Name : %.32s", sb
->set_name
);
355 if (l
> 0 && l
< 32 &&
356 sb
->set_name
[l
] == ':' &&
357 strncmp(sb
->set_name
, homehost
, l
) == 0)
358 printf(" (local to host %s)", homehost
);
359 printf("\n UUID : ");
360 for (i
=0; i
<16; i
++) {
361 if ((i
&3)==0 && i
!= 0) printf(":");
362 printf("%02x", sb
->set_uuid
[i
]);
364 printf("\n Events : %llu\n\n", (unsigned long long)__le64_to_cpu(sb
->events
));
367 static void brief_detail_super1(void *sbv
)
369 struct mdp_superblock_1
*sb
= sbv
;
373 printf(" name=%.32s", sb
->set_name
);
375 for (i
=0; i
<16; i
++) {
376 if ((i
&3)==0 && i
!= 0) printf(":");
377 printf("%02x", sb
->set_uuid
[i
]);
383 static int match_home1(void *sbv
, char *homehost
)
385 struct mdp_superblock_1
*sb
= sbv
;
386 int l
= homehost
? strlen(homehost
) : 0;
388 return (l
> 0 && l
< 32 &&
389 sb
->set_name
[l
] == ':' &&
390 strncmp(sb
->set_name
, homehost
, l
) == 0);
393 static void uuid_from_super1(int uuid
[4], void * sbv
)
395 struct mdp_superblock_1
*super
= sbv
;
396 char *cuuid
= (char*)uuid
;
399 cuuid
[i
] = super
->set_uuid
[i
];
402 static void getinfo_super1(struct mdinfo
*info
, void *sbv
)
404 struct mdp_superblock_1
*sb
= sbv
;
409 info
->array
.major_version
= 1;
410 info
->array
.minor_version
= __le32_to_cpu(sb
->feature_map
);
411 info
->array
.patch_version
= 0;
412 info
->array
.raid_disks
= __le32_to_cpu(sb
->raid_disks
);
413 info
->array
.level
= __le32_to_cpu(sb
->level
);
414 info
->array
.layout
= __le32_to_cpu(sb
->layout
);
415 info
->array
.md_minor
= -1;
416 info
->array
.ctime
= __le64_to_cpu(sb
->ctime
);
417 info
->array
.utime
= __le64_to_cpu(sb
->utime
);
418 info
->array
.chunk_size
= __le32_to_cpu(sb
->chunksize
)*512;
420 info
->data_offset
= __le64_to_cpu(sb
->data_offset
);
421 info
->component_size
= __le64_to_cpu(sb
->size
);
423 info
->disk
.major
= 0;
424 info
->disk
.minor
= 0;
425 info
->disk
.number
= __le32_to_cpu(sb
->dev_number
);
426 if (__le32_to_cpu(sb
->dev_number
) >= __le32_to_cpu(sb
->max_dev
) ||
427 __le32_to_cpu(sb
->max_dev
) > 512)
430 role
= __le16_to_cpu(sb
->dev_roles
[__le32_to_cpu(sb
->dev_number
)]);
432 info
->disk
.raid_disk
= -1;
435 info
->disk
.state
= 2; /* spare: ACTIVE, not sync, not faulty */
438 info
->disk
.state
= 1; /* faulty */
441 info
->disk
.state
= 6; /* active and in sync */
442 info
->disk
.raid_disk
= role
;
444 info
->events
= __le64_to_cpu(sb
->events
);
446 memcpy(info
->uuid
, sb
->set_uuid
, 16);
448 strncpy(info
->name
, sb
->set_name
, 32);
451 if (sb
->feature_map
& __le32_to_cpu(MD_FEATURE_RESHAPE_ACTIVE
)) {
452 info
->reshape_active
= 1;
453 info
->reshape_progress
= __le64_to_cpu(sb
->reshape_position
);
454 info
->new_level
= __le32_to_cpu(sb
->new_level
);
455 info
->delta_disks
= __le32_to_cpu(sb
->delta_disks
);
456 info
->new_layout
= __le32_to_cpu(sb
->new_layout
);
457 info
->new_chunk
= __le32_to_cpu(sb
->new_chunk
)<<9;
459 info
->reshape_active
= 0;
461 for (i
=0; i
< __le32_to_cpu(sb
->max_dev
); i
++) {
462 role
= __le16_to_cpu(sb
->dev_roles
[i
]);
463 if (/*role == 0xFFFF || */role
< info
->array
.raid_disks
)
467 info
->array
.working_disks
= working
;
470 static int update_super1(struct mdinfo
*info
, void *sbv
, char *update
,
471 char *devname
, int verbose
,
472 int uuid_set
, char *homehost
)
474 /* NOTE: for 'assemble' and 'force' we need to return non-zero if any change was made.
475 * For others, the return value is ignored.
478 struct mdp_superblock_1
*sb
= sbv
;
480 if (strcmp(update
, "force")==0) {
481 if (sb
->events
!= __cpu_to_le64(info
->events
))
483 sb
->events
= __cpu_to_le64(info
->events
);
484 switch(__le32_to_cpu(sb
->level
)) {
485 case 5: case 4: case 6:
486 /* need to force clean */
487 if (sb
->resync_offset
!= ~0ULL)
489 sb
->resync_offset
= ~0ULL;
492 if (strcmp(update
, "assemble")==0) {
493 int d
= info
->disk
.number
;
495 if (info
->disk
.state
== 6)
496 want
= __cpu_to_le32(info
->disk
.raid_disk
);
499 if (sb
->dev_roles
[d
] != want
) {
500 sb
->dev_roles
[d
] = want
;
505 if (strcmp(update
, "newdev") == 0) {
506 int d
= info
->disk
.number
;
507 memset(&sb
->disks
[d
], 0, sizeof(sb
->disks
[d
]));
508 sb
->disks
[d
].number
= d
;
509 sb
->disks
[d
].major
= info
->disk
.major
;
510 sb
->disks
[d
].minor
= info
->disk
.minor
;
511 sb
->disks
[d
].raid_disk
= info
->disk
.raid_disk
;
512 sb
->disks
[d
].state
= info
->disk
.state
;
513 sb
->this_disk
= sb
->disks
[d
];
516 if (strcmp(update
, "grow") == 0) {
517 sb
->raid_disks
= __cpu_to_le32(info
->array
.raid_disks
);
520 if (strcmp(update
, "resync") == 0) {
521 /* make sure resync happens */
522 sb
->resync_offset
= ~0ULL;
524 if (strcmp(update
, "uuid") == 0) {
525 memcpy(sb
->set_uuid
, info
->uuid
, 16);
526 if (__le32_to_cpu(sb
->feature_map
)&MD_FEATURE_BITMAP_OFFSET
) {
527 struct bitmap_super_s
*bm
;
528 bm
= (struct bitmap_super_s
*)(sbv
+1024);
529 memcpy(bm
->uuid
, info
->uuid
, 16);
532 if (strcmp(update
, "homehost") == 0 &&
536 c
= strchr(sb
->set_name
, ':');
538 strncpy(info
->name
, c
+1, 31 - (c
-sb
->set_name
));
540 strncpy(info
->name
, sb
->set_name
, 32);
543 if (strcmp(update
, "name") == 0) {
544 if (info
->name
[0] == 0)
545 sprintf(info
->name
, "%d", info
->array
.md_minor
);
546 memset(sb
->set_name
, 0, sizeof(sb
->set_name
));
548 strchr(info
->name
, ':') == NULL
&&
549 strlen(homehost
)+1+strlen(info
->name
) < 32) {
550 strcpy(sb
->set_name
, homehost
);
551 strcat(sb
->set_name
, ":");
552 strcat(sb
->set_name
, info
->name
);
554 strcpy(sb
->set_name
, info
->name
);
556 if (strcmp(update
, "_reshape_progress")==0)
557 sb
->reshape_position
= __cpu_to_le64(info
->reshape_progress
);
559 sb
->sb_csum
= calc_sb_1_csum(sb
);
564 static __u64
event_super1(void *sbv
)
566 struct mdp_superblock_1
*sb
= sbv
;
567 return __le64_to_cpu(sb
->events
);
570 static int init_super1(struct supertype
*st
, void **sbp
, mdu_array_info_t
*info
,
571 unsigned long long size
, char *name
, char *homehost
)
573 struct mdp_superblock_1
*sb
= malloc(1024 + sizeof(bitmap_super_t
));
579 if (info
->major_version
== -1) {
580 /* zeroing superblock */
585 spares
= info
->working_disks
- info
->active_disks
;
586 if (info
->raid_disks
+ spares
> 384) {
587 fprintf(stderr
, Name
": too many devices requested: %d+%d > %d\n",
588 info
->raid_disks
, spares
, 384);
592 sb
->magic
= __cpu_to_le32(MD_SB_MAGIC
);
593 sb
->major_version
= __cpu_to_le32(1);
597 if ((rfd
= open("/dev/urandom", O_RDONLY
)) < 0 ||
598 read(rfd
, sb
->set_uuid
, 16) != 16) {
599 *(__u32
*)(sb
->set_uuid
) = random();
600 *(__u32
*)(sb
->set_uuid
+4) = random();
601 *(__u32
*)(sb
->set_uuid
+8) = random();
602 *(__u32
*)(sb
->set_uuid
+12) = random();
604 if (rfd
>= 0) close(rfd
);
606 if (name
== NULL
|| *name
== 0) {
607 sprintf(defname
, "%d", info
->md_minor
);
610 memset(sb
->set_name
, 0, 32);
612 strchr(name
, ':')== NULL
&&
613 strlen(homehost
)+1+strlen(name
) < 32) {
614 strcpy(sb
->set_name
, homehost
);
615 strcat(sb
->set_name
, ":");
616 strcat(sb
->set_name
, name
);
618 strcpy(sb
->set_name
, name
);
620 sb
->ctime
= __cpu_to_le64((unsigned long long)time(0));
621 sb
->level
= __cpu_to_le32(info
->level
);
622 sb
->layout
= __cpu_to_le32(info
->layout
);
623 sb
->size
= __cpu_to_le64(size
*2ULL);
624 sb
->chunksize
= __cpu_to_le32(info
->chunk_size
>>9);
625 sb
->raid_disks
= __cpu_to_le32(info
->raid_disks
);
627 sb
->data_offset
= __cpu_to_le64(0);
628 sb
->data_size
= __cpu_to_le64(0);
629 sb
->super_offset
= __cpu_to_le64(0);
630 sb
->recovery_offset
= __cpu_to_le64(0);
632 sb
->utime
= sb
->ctime
;
633 sb
->events
= __cpu_to_le64(1);
634 if (info
->state
& (1<<MD_SB_CLEAN
))
635 sb
->resync_offset
= ~0ULL;
637 sb
->resync_offset
= 0;
638 sb
->max_dev
= __cpu_to_le32((1024- sizeof(struct mdp_superblock_1
))/
639 sizeof(sb
->dev_roles
[0]));
640 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
642 memset(sb
->dev_roles
, 0xff, 1024 - sizeof(struct mdp_superblock_1
));
648 /* Add a device to the superblock being created */
649 static void add_to_super1(void *sbv
, mdu_disk_info_t
*dk
)
651 struct mdp_superblock_1
*sb
= sbv
;
652 __u16
*rp
= sb
->dev_roles
+ dk
->number
;
653 if ((dk
->state
& 6) == 6) /* active, sync */
654 *rp
= __cpu_to_le16(dk
->raid_disk
);
655 else if ((dk
->state
& ~2) == 0) /* active or idle -> spare */
661 static void locate_bitmap1(struct supertype
*st
, int fd
, void *sbv
);
663 static int store_super1(struct supertype
*st
, int fd
, void *sbv
)
665 struct mdp_superblock_1
*sb
= sbv
;
666 unsigned long long sb_offset
;
669 unsigned long long dsize
;
672 if (ioctl(fd
, BLKGETSIZE64
, &dsize
) != 0)
675 if (ioctl(fd
, BLKGETSIZE
, &size
))
678 dsize
= (unsigned long long)size
;
686 * Calculate the position of the superblock.
687 * It is always aligned to a 4K boundary and
688 * depending on minor_version, it can be:
689 * 0: At least 8K, but less than 12K, from end of device
690 * 1: At start of device
691 * 2: 4K from start of device.
693 switch(st
->minor_version
) {
697 sb_offset
&= ~(4*2-1);
711 if (sb_offset
!= __le64_to_cpu(sb
->super_offset
) &&
712 0 != __le64_to_cpu(sb
->super_offset
)
714 fprintf(stderr
, Name
": internal error - sb_offset is wrong\n");
718 if (lseek64(fd
, sb_offset
<< 9, 0)< 0LL)
721 sbsize
= sizeof(*sb
) + 2 * __le32_to_cpu(sb
->max_dev
);
723 if (write(fd
, sb
, sbsize
) != sbsize
)
726 if (sb
->feature_map
& __cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
)) {
727 struct bitmap_super_s
*bm
= (struct bitmap_super_s
*)
729 if (__le32_to_cpu(bm
->magic
) == BITMAP_MAGIC
) {
730 locate_bitmap1(st
, fd
, sbv
);
731 if (write(fd
, bm
, sizeof(*bm
)) != sizeof(*bm
))
739 static int load_super1(struct supertype
*st
, int fd
, void **sbp
, char *devname
);
741 static int write_init_super1(struct supertype
*st
, void *sbv
,
742 mdu_disk_info_t
*dinfo
, char *devname
)
744 struct mdp_superblock_1
*sb
= sbv
;
746 int fd
= open(devname
, O_RDWR
| O_EXCL
);
750 unsigned long size
, space
;
751 unsigned long long dsize
, array_size
;
756 fprintf(stderr
, Name
": Failed to open %s to write superblock\n",
761 sb
->dev_number
= __cpu_to_le32(dinfo
->number
);
762 if (dinfo
->state
& (1<<MD_DISK_WRITEMOSTLY
))
763 sb
->devflags
|= WriteMostly1
;
765 if ((rfd
= open("/dev/urandom", O_RDONLY
)) < 0 ||
766 read(rfd
, sb
->device_uuid
, 16) != 16) {
767 *(__u32
*)(sb
->device_uuid
) = random();
768 *(__u32
*)(sb
->device_uuid
+4) = random();
769 *(__u32
*)(sb
->device_uuid
+8) = random();
770 *(__u32
*)(sb
->device_uuid
+12) = random();
772 if (rfd
>= 0) close(rfd
);
775 if (load_super1(st
, fd
, &refsbv
, NULL
)==0) {
776 struct mdp_superblock_1
*refsb
= refsbv
;
778 memcpy(sb
->device_uuid
, refsb
->device_uuid
, 16);
779 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16)==0) {
780 /* same array, so preserve events and dev_number */
781 sb
->events
= refsb
->events
;
782 /* bugs in 2.6.17 and earlier mean the dev_number
783 * chosen in Manage must be preserved
785 if (get_linux_version() >= 2006018)
786 sb
->dev_number
= refsb
->dev_number
;
792 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 switch(st
->minor_version
) {
823 sb_offset
&= ~(4*2-1);
824 sb
->super_offset
= __cpu_to_le64(sb_offset
);
825 sb
->data_offset
= __cpu_to_le64(0);
826 if (sb_offset
-64*2 >= array_size
&& array_size
> 8*1024*1024*2)
827 sb
->data_size
= __cpu_to_le64(sb_offset
-64*2);
829 sb
->data_size
= __cpu_to_le64(sb_offset
);
832 sb
->super_offset
= __cpu_to_le64(0);
833 if (dsize
- 64*2 >= array_size
&& array_size
> 8*1024*1024*2)
837 sb
->data_offset
= __cpu_to_le64(space
); /* leave space for super and bitmap */
838 sb
->data_size
= __cpu_to_le64(dsize
- space
);
842 if (dsize
- 4*2 - 64*2 >= array_size
&& array_size
> 8*1024*1024*2)
846 sb
->super_offset
= __cpu_to_le64(sb_offset
);
847 sb
->data_offset
= __cpu_to_le64(sb_offset
+space
);
848 sb
->data_size
= __cpu_to_le64(dsize
- 4*2 - space
);
855 sb
->sb_csum
= calc_sb_1_csum(sb
);
856 rv
= store_super1(st
, fd
, sb
);
858 fprintf(stderr
, Name
": failed to write superblock to %s\n", devname
);
860 if (rv
== 0 && (__le32_to_cpu(sb
->feature_map
) & 1))
861 rv
= st
->ss
->write_bitmap(st
, fd
, sbv
);
866 static int compare_super1(void **firstp
, void *secondv
)
870 * 0 same, or first was empty, and second was copied
871 * 1 second had wrong number
875 struct mdp_superblock_1
*first
= *firstp
;
876 struct mdp_superblock_1
*second
= secondv
;
878 if (second
->magic
!= __cpu_to_le32(MD_SB_MAGIC
))
880 if (second
->major_version
!= __cpu_to_le32(1))
884 first
= malloc(1024+sizeof(bitmap_super_t
));
885 memcpy(first
, second
, 1024+sizeof(bitmap_super_t
));
889 if (memcmp(first
->set_uuid
, second
->set_uuid
, 16)!= 0)
892 if (first
->ctime
!= second
->ctime
||
893 first
->level
!= second
->level
||
894 first
->layout
!= second
->layout
||
895 first
->size
!= second
->size
||
896 first
->chunksize
!= second
->chunksize
||
897 first
->raid_disks
!= second
->raid_disks
)
902 static int load_super1(struct supertype
*st
, int fd
, void **sbp
, char *devname
)
905 unsigned long long dsize
;
906 unsigned long long sb_offset
;
907 struct mdp_superblock_1
*super
;
909 struct bitmap_super_s
*bsb
;
912 if (st
->ss
== NULL
) {
915 /* guess... choose latest ctime */
917 for (st
->minor_version
= 0; st
->minor_version
<= 2 ; st
->minor_version
++) {
918 switch(load_super1(st
, fd
, sbp
, devname
)) {
919 case 0: super
= *sbp
;
920 if (bestvers
== -1 ||
921 bestctime
< __le64_to_cpu(super
->ctime
)) {
922 bestvers
= st
->minor_version
;
923 bestctime
= __le64_to_cpu(super
->ctime
);
928 case 1: st
->ss
= NULL
; return 1; /*bad device */
929 case 2: break; /* bad, try next */
932 if (bestvers
!= -1) {
934 st
->minor_version
= bestvers
;
937 rv
= load_super1(st
, fd
, sbp
, devname
);
938 if (rv
) st
->ss
= NULL
;
945 if (ioctl(fd
, BLKGETSIZE64
, &dsize
) != 0)
948 if (ioctl(fd
, BLKGETSIZE
, &size
)) {
950 fprintf(stderr
, Name
": cannot find device size for %s: %s\n",
951 devname
, strerror(errno
));
960 fprintf(stderr
, Name
": %s is too small for md: size is %llu sectors.\n",
966 * Calculate the position of the superblock.
967 * It is always aligned to a 4K boundary and
968 * depending on minor_version, it can be:
969 * 0: At least 8K, but less than 12K, from end of device
970 * 1: At start of device
971 * 2: 4K from start of device.
973 switch(st
->minor_version
) {
977 sb_offset
&= ~(4*2-1);
989 ioctl(fd
, BLKFLSBUF
, 0); /* make sure we read current data */
992 if (lseek64(fd
, sb_offset
<< 9, 0)< 0LL) {
994 fprintf(stderr
, Name
": Cannot seek to superblock on %s: %s\n",
995 devname
, strerror(errno
));
999 super
= malloc(1024 + sizeof(bitmap_super_t
));
1001 if (read(fd
, super
, 1024) != 1024) {
1003 fprintf(stderr
, Name
": Cannot read superblock on %s\n",
1009 if (__le32_to_cpu(super
->magic
) != MD_SB_MAGIC
) {
1011 fprintf(stderr
, Name
": No super block found on %s (Expected magic %08x, got %08x)\n",
1012 devname
, MD_SB_MAGIC
, __le32_to_cpu(super
->magic
));
1017 if (__le32_to_cpu(super
->major_version
) != 1) {
1019 fprintf(stderr
, Name
": Cannot interpret superblock on %s - version is %d\n",
1020 devname
, __le32_to_cpu(super
->major_version
));
1024 if (__le64_to_cpu(super
->super_offset
) != sb_offset
) {
1026 fprintf(stderr
, Name
": No superblock found on %s (super_offset is wrong)\n",
1033 /* Now check on the bitmap superblock */
1034 if ((__le32_to_cpu(super
->feature_map
)&MD_FEATURE_BITMAP_OFFSET
) == 0)
1036 /* Read the bitmap superblock and make sure it looks
1037 * valid. If it doesn't clear the bit. An --assemble --force
1038 * should get that written out.
1040 locate_bitmap1(st
, fd
, super
);
1041 if (read(fd
, ((char*)super
)+1024, sizeof(struct bitmap_super_s
))
1042 != sizeof(struct bitmap_super_s
))
1045 uuid_from_super1(uuid
, super
);
1046 bsb
= (struct bitmap_super_s
*)(((char*)super
)+1024);
1047 if (__le32_to_cpu(bsb
->magic
) != BITMAP_MAGIC
||
1048 memcmp(bsb
->uuid
, uuid
, 16) != 0)
1053 super
->feature_map
= __cpu_to_le32(__le32_to_cpu(super
->feature_map
) & ~1);
1058 static struct supertype
*match_metadata_desc1(char *arg
)
1060 struct supertype
*st
= malloc(sizeof(*st
));
1065 if (strcmp(arg
, "1") == 0 ||
1066 strcmp(arg
, "1.0") == 0 ||
1067 strcmp(arg
, "default/large") == 0) {
1068 st
->minor_version
= 0;
1071 if (strcmp(arg
, "1.1") == 0) {
1072 st
->minor_version
= 1;
1075 if (strcmp(arg
, "1.2") == 0) {
1076 st
->minor_version
= 2;
1084 /* find available size on device with this devsize, using
1085 * superblock type st, and reserving 'reserve' sectors for
1088 static __u64
avail_size1(struct supertype
*st
, __u64 devsize
)
1093 /* if the device is bigger than 8Gig, save 64k for bitmap usage,
1094 * if biffer than 200Gig, save 128k
1096 if (devsize
> 200*1024*1024*2)
1098 else if (devsize
> 8*1024*1024*2)
1101 switch(st
->minor_version
) {
1104 return ((devsize
- 8*2 ) & ~(4*2-1));
1106 /* at start, 4K for superblock and possible bitmap */
1107 return devsize
- 4*2;
1109 /* 4k from start, 4K for superblock and possible bitmap */
1110 return devsize
- (4+4)*2;
1116 add_internal_bitmap1(struct supertype
*st
, void *sbv
,
1117 int chunk
, int delay
, int write_behind
, unsigned long long size
,
1118 int may_change
, int major
)
1121 * If not may_change, then this is a 'Grow', and the bitmap
1122 * must fit after the superblock.
1123 * If may_change, then this is create, and we can put the bitmap
1124 * before the superblock if we like, or may move the start.
1125 * For now, just squeeze the bitmap into 3k and don't change anything.
1127 * size is in sectors, chunk is in bytes !!!
1130 unsigned long long bits
;
1131 unsigned long long max_bits
= (3*512 - sizeof(bitmap_super_t
)) * 8;
1132 unsigned long long min_chunk
;
1133 struct mdp_superblock_1
*sb
= sbv
;
1134 bitmap_super_t
*bms
= (bitmap_super_t
*)(((char*)sb
) + 1024);
1136 if (st
->minor_version
&& !may_change
&&
1137 __le64_to_cpu(sb
->data_offset
) - __le64_to_cpu(sb
->super_offset
) < 8)
1138 return 0; /* doesn't fit */
1142 min_chunk
= 4096; /* sub-page chunks don't work yet.. */
1143 bits
= (size
*512)/min_chunk
+1;
1144 while (bits
> max_bits
) {
1150 else if (chunk
< min_chunk
)
1151 return 0; /* chunk size too small */
1152 if (chunk
== 0) /* rounding problem */
1155 sb
->bitmap_offset
= __cpu_to_le32(2);
1157 sb
->feature_map
= __cpu_to_le32(__le32_to_cpu(sb
->feature_map
) | 1);
1158 memset(bms
, 0, sizeof(*bms
));
1159 bms
->magic
= __cpu_to_le32(BITMAP_MAGIC
);
1160 bms
->version
= __cpu_to_le32(major
);
1161 uuid_from_super1((int*)bms
->uuid
, sb
);
1162 bms
->chunksize
= __cpu_to_le32(chunk
);
1163 bms
->daemon_sleep
= __cpu_to_le32(delay
);
1164 bms
->sync_size
= __cpu_to_le64(size
);
1165 bms
->write_behind
= __cpu_to_le32(write_behind
);
1171 static void locate_bitmap1(struct supertype
*st
, int fd
, void *sbv
)
1173 unsigned long long offset
;
1174 struct mdp_superblock_1
*sb
;
1178 if (st
->ss
->load_super(st
, fd
, &sbv
, NULL
))
1179 return; /* no error I hope... */
1184 offset
= __le64_to_cpu(sb
->super_offset
);
1185 offset
+= (long) __le32_to_cpu(sb
->bitmap_offset
);
1188 lseek64(fd
, offset
<<9, 0);
1191 static int write_bitmap1(struct supertype
*st
, int fd
, void *sbv
)
1193 struct mdp_superblock_1
*sb
= sbv
;
1194 bitmap_super_t
*bms
= (bitmap_super_t
*)(((char*)sb
)+1024);
1200 locate_bitmap1(st
, fd
, sbv
);
1202 if (write(fd
, ((char*)sb
)+1024, sizeof(bitmap_super_t
)) !=
1203 sizeof(bitmap_super_t
))
1205 towrite
= __le64_to_cpu(bms
->sync_size
) / (__le32_to_cpu(bms
->chunksize
)>>9);
1206 towrite
= (towrite
+7) >> 3; /* bits to bytes */
1207 memset(buf
, 0xff, sizeof(buf
));
1208 while (towrite
> 0) {
1210 if (n
> sizeof(buf
))
1212 n
= write(fd
, buf
, n
);
1225 struct superswitch super1
= {
1227 .examine_super
= examine_super1
,
1228 .brief_examine_super
= brief_examine_super1
,
1229 .detail_super
= detail_super1
,
1230 .brief_detail_super
= brief_detail_super1
,
1232 .match_home
= match_home1
,
1233 .uuid_from_super
= uuid_from_super1
,
1234 .getinfo_super
= getinfo_super1
,
1235 .update_super
= update_super1
,
1236 .event_super
= event_super1
,
1237 .init_super
= init_super1
,
1238 .add_to_super
= add_to_super1
,
1239 .store_super
= store_super1
,
1240 .write_init_super
= write_init_super1
,
1241 .compare_super
= compare_super1
,
1242 .load_super
= load_super1
,
1243 .match_metadata_desc
= match_metadata_desc1
,
1244 .avail_size
= avail_size1
,
1245 .add_internal_bitmap
= add_internal_bitmap1
,
1246 .locate_bitmap
= locate_bitmap1
,
1247 .write_bitmap
= write_bitmap1
,
1249 #if __BYTE_ORDER == BIG_ENDIAN