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 struct misc_dev_info
{
101 /* feature_map bits */
102 #define MD_FEATURE_BITMAP_OFFSET 1
103 #define MD_FEATURE_RECOVERY_OFFSET 2 /* recovery_offset is present and
106 #define MD_FEATURE_RESHAPE_ACTIVE 4
108 #define MD_FEATURE_ALL (1|2|4)
111 #define offsetof(t,f) ((size_t)&(((t*)0)->f))
113 static unsigned int calc_sb_1_csum(struct mdp_superblock_1
* sb
)
115 unsigned int disk_csum
, csum
;
116 unsigned long long newcsum
;
117 int size
= sizeof(*sb
) + __le32_to_cpu(sb
->max_dev
)*2;
118 unsigned int *isuper
= (unsigned int*)sb
;
121 /* make sure I can count... */
122 if (offsetof(struct mdp_superblock_1
,data_offset
) != 128 ||
123 offsetof(struct mdp_superblock_1
, utime
) != 192 ||
124 sizeof(struct mdp_superblock_1
) != 256) {
125 fprintf(stderr
, "WARNING - superblock isn't sized correctly\n");
128 disk_csum
= sb
->sb_csum
;
131 for (i
=0; size
>=4; size
-= 4 ) {
132 newcsum
+= __le32_to_cpu(*isuper
);
137 newcsum
+= __le16_to_cpu(*(unsigned short*) isuper
);
139 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
140 sb
->sb_csum
= disk_csum
;
141 return __cpu_to_le32(csum
);
145 static void examine_super1(void *sbv
, char *homehost
)
147 struct mdp_superblock_1
*sb
= sbv
;
153 int l
= homehost
? strlen(homehost
) : 0;
156 printf(" Magic : %08x\n", __le32_to_cpu(sb
->magic
));
157 printf(" Version : %02d\n", 1);
158 printf(" Feature Map : 0x%x\n", __le32_to_cpu(sb
->feature_map
));
159 printf(" Array UUID : ");
160 for (i
=0; i
<16; i
++) {
161 if ((i
&3)==0 && i
!= 0) printf(":");
162 printf("%02x", sb
->set_uuid
[i
]);
165 printf(" Name : %.32s", sb
->set_name
);
166 if (l
> 0 && l
< 32 &&
167 sb
->set_name
[l
] == ':' &&
168 strncmp(sb
->set_name
, homehost
, l
) == 0)
169 printf(" (local to host %s)", homehost
);
171 atime
= __le64_to_cpu(sb
->ctime
) & 0xFFFFFFFFFFULL
;
172 printf(" Creation Time : %.24s\n", ctime(&atime
));
173 c
=map_num(pers
, __le32_to_cpu(sb
->level
));
174 printf(" Raid Level : %s\n", c
?c
:"-unknown-");
175 printf(" Raid Devices : %d\n", __le32_to_cpu(sb
->raid_disks
));
177 printf(" Used Dev Size : %llu%s\n",
178 (unsigned long long)__le64_to_cpu(sb
->data_size
),
179 human_size(__le64_to_cpu(sb
->data_size
)<<9));
180 if (__le32_to_cpu(sb
->level
) >= 0) {
182 switch(__le32_to_cpu(sb
->level
)) {
183 case 1: ddsks
=1;break;
185 case 5: ddsks
= __le32_to_cpu(sb
->raid_disks
)-1; break;
186 case 6: ddsks
= __le32_to_cpu(sb
->raid_disks
)-2; break;
188 layout
= __le32_to_cpu(sb
->layout
);
189 ddsks
= __le32_to_cpu(sb
->raid_disks
)
190 / (layout
&255) / ((layout
>>8)&255);
193 printf(" Array Size : %llu%s\n",
194 ddsks
*(unsigned long long)__le64_to_cpu(sb
->size
),
195 human_size(ddsks
*__le64_to_cpu(sb
->size
)<<9));
196 if (sb
->size
!= sb
->data_size
)
197 printf(" Used Size : %llu%s\n",
198 (unsigned long long)__le64_to_cpu(sb
->size
),
199 human_size(__le64_to_cpu(sb
->size
)<<9));
202 printf(" Data Offset : %llu sectors\n",
203 (unsigned long long)__le64_to_cpu(sb
->data_offset
));
204 printf(" Super Offset : %llu sectors\n",
205 (unsigned long long)__le64_to_cpu(sb
->super_offset
));
206 if (__le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RECOVERY_OFFSET
)
207 printf("Recovery Offset : %llu sectors\n", (unsigned long long)__le64_to_cpu(sb
->recovery_offset
));
208 printf(" State : %s\n", (__le64_to_cpu(sb
->resync_offset
)+1)? "active":"clean");
209 printf(" Device UUID : ");
210 for (i
=0; i
<16; i
++) {
211 if ((i
&3)==0 && i
!= 0) printf(":");
212 printf("%02x", sb
->device_uuid
[i
]);
216 if (sb
->feature_map
& __cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
)) {
217 printf("Internal Bitmap : %ld sectors from superblock\n",
218 (long)(int32_t)__le32_to_cpu(sb
->bitmap_offset
));
220 if (sb
->feature_map
& __le32_to_cpu(MD_FEATURE_RESHAPE_ACTIVE
)) {
221 printf(" Reshape pos'n : %llu%s\n", (unsigned long long)__le64_to_cpu(sb
->reshape_position
)/2,
222 human_size(__le64_to_cpu(sb
->reshape_position
)<<9));
223 if (__le32_to_cpu(sb
->delta_disks
)) {
224 printf(" Delta Devices : %d", __le32_to_cpu(sb
->delta_disks
));
225 if (__le32_to_cpu(sb
->delta_disks
))
226 printf(" (%d->%d)\n",
227 __le32_to_cpu(sb
->raid_disks
)-__le32_to_cpu(sb
->delta_disks
),
228 __le32_to_cpu(sb
->raid_disks
));
230 printf(" (%d->%d)\n", __le32_to_cpu(sb
->raid_disks
),
231 __le32_to_cpu(sb
->raid_disks
)+__le32_to_cpu(sb
->delta_disks
));
233 if (__le32_to_cpu(sb
->new_level
) != __le32_to_cpu(sb
->level
)) {
234 c
= map_num(pers
, __le32_to_cpu(sb
->new_level
));
235 printf(" New Level : %s\n", c
?c
:"-unknown-");
237 if (__le32_to_cpu(sb
->new_layout
) != __le32_to_cpu(sb
->layout
)) {
238 if (__le32_to_cpu(sb
->level
) == 5) {
239 c
= map_num(r5layout
, __le32_to_cpu(sb
->new_layout
));
240 printf(" New Layout : %s\n", c
?c
:"-unknown-");
242 if (__le32_to_cpu(sb
->level
) == 10) {
243 printf(" New Layout : near=%d, %s=%d\n",
244 __le32_to_cpu(sb
->new_layout
)&255,
245 (__le32_to_cpu(sb
->new_layout
)&0x10000)?"offset":"far",
246 (__le32_to_cpu(sb
->new_layout
)>>8)&255);
249 if (__le32_to_cpu(sb
->new_chunk
) != __le32_to_cpu(sb
->chunksize
))
250 printf(" New Chunksize : %dK\n", __le32_to_cpu(sb
->new_chunk
)/2);
255 if (sb
->devflags
& WriteMostly1
)
256 printf(" write-mostly");
260 atime
= __le64_to_cpu(sb
->utime
) & 0xFFFFFFFFFFULL
;
261 printf(" Update Time : %.24s\n", ctime(&atime
));
263 if (calc_sb_1_csum(sb
) == sb
->sb_csum
)
264 printf(" Checksum : %x - correct\n", __le32_to_cpu(sb
->sb_csum
));
266 printf(" Checksum : %x - expected %x\n", __le32_to_cpu(sb
->sb_csum
),
267 __le32_to_cpu(calc_sb_1_csum(sb
)));
268 printf(" Events : %llu\n", (unsigned long long)__le64_to_cpu(sb
->events
));
270 if (__le32_to_cpu(sb
->level
) == 5) {
271 c
= map_num(r5layout
, __le32_to_cpu(sb
->layout
));
272 printf(" Layout : %s\n", c
?c
:"-unknown-");
274 if (__le32_to_cpu(sb
->level
) == 10) {
275 int lo
= __le32_to_cpu(sb
->layout
);
276 printf(" Layout : near=%d, %s=%d\n",
278 (lo
&0x10000)?"offset":"far",
281 switch(__le32_to_cpu(sb
->level
)) {
287 printf(" Chunk Size : %dK\n", __le32_to_cpu(sb
->chunksize
)/2);
290 printf(" Rounding : %dK\n", __le32_to_cpu(sb
->chunksize
)/2);
295 printf(" Array Slot : %d (", __le32_to_cpu(sb
->dev_number
));
296 for (i
= __le32_to_cpu(sb
->max_dev
); i
> 0 ; i
--)
297 if (__le16_to_cpu(sb
->dev_roles
[i
-1]) != 0xffff)
299 for (d
=0; d
< i
; d
++) {
300 int role
= __le16_to_cpu(sb
->dev_roles
[d
]);
302 if (role
== 0xffff) printf("empty");
303 else if(role
== 0xfffe) printf("failed");
304 else printf("%d", role
);
307 printf(" Array State : ");
308 for (d
=0; d
<__le32_to_cpu(sb
->raid_disks
); d
++) {
312 for (i
=0; i
< __le32_to_cpu(sb
->max_dev
); i
++) {
313 int role
= __le16_to_cpu(sb
->dev_roles
[i
]);
315 if (i
== __le32_to_cpu(sb
->dev_number
))
320 if (cnt
> 1) printf("?");
321 else if (cnt
== 1 && me
) printf("U");
322 else if (cnt
== 1) printf("u");
326 for (i
=0; i
< __le32_to_cpu(sb
->max_dev
); i
++) {
327 int role
= __le16_to_cpu(sb
->dev_roles
[i
]);
331 if (faulty
) printf(" %d failed", faulty
);
336 static void brief_examine_super1(void *sbv
)
338 struct mdp_superblock_1
*sb
= sbv
;
341 char *c
=map_num(pers
, __le32_to_cpu(sb
->level
));
343 nm
= strchr(sb
->set_name
, ':');
346 else if (sb
->set_name
[0])
351 printf("ARRAY /dev/md/%s level=%s metadata=1 num-devices=%d UUID=",
353 c
?c
:"-unknown-", __le32_to_cpu(sb
->raid_disks
));
354 for (i
=0; i
<16; i
++) {
355 if ((i
&3)==0 && i
!= 0) printf(":");
356 printf("%02x", sb
->set_uuid
[i
]);
359 printf(" name=%.32s", sb
->set_name
);
363 static void detail_super1(void *sbv
, char *homehost
)
365 struct mdp_superblock_1
*sb
= sbv
;
367 int l
= homehost
? strlen(homehost
) : 0;
369 printf(" Name : %.32s", sb
->set_name
);
370 if (l
> 0 && l
< 32 &&
371 sb
->set_name
[l
] == ':' &&
372 strncmp(sb
->set_name
, homehost
, l
) == 0)
373 printf(" (local to host %s)", homehost
);
374 printf("\n UUID : ");
375 for (i
=0; i
<16; i
++) {
376 if ((i
&3)==0 && i
!= 0) printf(":");
377 printf("%02x", sb
->set_uuid
[i
]);
379 printf("\n Events : %llu\n\n", (unsigned long long)__le64_to_cpu(sb
->events
));
382 static void brief_detail_super1(void *sbv
)
384 struct mdp_superblock_1
*sb
= sbv
;
388 printf(" name=%.32s", sb
->set_name
);
390 for (i
=0; i
<16; i
++) {
391 if ((i
&3)==0 && i
!= 0) printf(":");
392 printf("%02x", sb
->set_uuid
[i
]);
396 static void export_super1(void *sbv
)
398 struct mdp_superblock_1
*sb
= sbv
;
403 if (sb
->set_name
[i
] == '\n' ||
404 sb
->set_name
[i
] == '\0') {
409 printf("MD_NAME=%.*s\n", len
, sb
->set_name
);
411 for (i
=0; i
<16; i
++) {
412 if ((i
&3)==0 && i
!= 0) printf(":");
413 printf("%02x", sb
->set_uuid
[i
]);
420 static int match_home1(void *sbv
, char *homehost
)
422 struct mdp_superblock_1
*sb
= sbv
;
423 int l
= homehost
? strlen(homehost
) : 0;
425 return (l
> 0 && l
< 32 &&
426 sb
->set_name
[l
] == ':' &&
427 strncmp(sb
->set_name
, homehost
, l
) == 0);
430 static void uuid_from_super1(int uuid
[4], void * sbv
)
432 struct mdp_superblock_1
*super
= sbv
;
433 char *cuuid
= (char*)uuid
;
436 cuuid
[i
] = super
->set_uuid
[i
];
439 static void getinfo_super1(struct mdinfo
*info
, void *sbv
)
441 struct mdp_superblock_1
*sb
= sbv
;
446 info
->array
.major_version
= 1;
447 info
->array
.minor_version
= __le32_to_cpu(sb
->feature_map
);
448 info
->array
.patch_version
= 0;
449 info
->array
.raid_disks
= __le32_to_cpu(sb
->raid_disks
);
450 info
->array
.level
= __le32_to_cpu(sb
->level
);
451 info
->array
.layout
= __le32_to_cpu(sb
->layout
);
452 info
->array
.md_minor
= -1;
453 info
->array
.ctime
= __le64_to_cpu(sb
->ctime
);
454 info
->array
.utime
= __le64_to_cpu(sb
->utime
);
455 info
->array
.chunk_size
= __le32_to_cpu(sb
->chunksize
)*512;
457 (__le64_to_cpu(sb
->resync_offset
) >= __le64_to_cpu(sb
->size
))
460 info
->data_offset
= __le64_to_cpu(sb
->data_offset
);
461 info
->component_size
= __le64_to_cpu(sb
->size
);
463 info
->disk
.major
= 0;
464 info
->disk
.minor
= 0;
465 info
->disk
.number
= __le32_to_cpu(sb
->dev_number
);
466 if (__le32_to_cpu(sb
->dev_number
) >= __le32_to_cpu(sb
->max_dev
) ||
467 __le32_to_cpu(sb
->max_dev
) > 512)
470 role
= __le16_to_cpu(sb
->dev_roles
[__le32_to_cpu(sb
->dev_number
)]);
472 info
->disk
.raid_disk
= -1;
475 info
->disk
.state
= 2; /* spare: ACTIVE, not sync, not faulty */
478 info
->disk
.state
= 1; /* faulty */
481 info
->disk
.state
= 6; /* active and in sync */
482 info
->disk
.raid_disk
= role
;
484 info
->events
= __le64_to_cpu(sb
->events
);
486 memcpy(info
->uuid
, sb
->set_uuid
, 16);
488 strncpy(info
->name
, sb
->set_name
, 32);
491 if (sb
->feature_map
& __le32_to_cpu(MD_FEATURE_RESHAPE_ACTIVE
)) {
492 info
->reshape_active
= 1;
493 info
->reshape_progress
= __le64_to_cpu(sb
->reshape_position
);
494 info
->new_level
= __le32_to_cpu(sb
->new_level
);
495 info
->delta_disks
= __le32_to_cpu(sb
->delta_disks
);
496 info
->new_layout
= __le32_to_cpu(sb
->new_layout
);
497 info
->new_chunk
= __le32_to_cpu(sb
->new_chunk
)<<9;
499 info
->reshape_active
= 0;
501 for (i
=0; i
< __le32_to_cpu(sb
->max_dev
); i
++) {
502 role
= __le16_to_cpu(sb
->dev_roles
[i
]);
503 if (/*role == 0xFFFF || */role
< info
->array
.raid_disks
)
507 info
->array
.working_disks
= working
;
510 static int update_super1(struct mdinfo
*info
, void *sbv
, char *update
,
511 char *devname
, int verbose
,
512 int uuid_set
, char *homehost
)
514 /* NOTE: for 'assemble' and 'force' we need to return non-zero if any change was made.
515 * For others, the return value is ignored.
518 struct mdp_superblock_1
*sb
= sbv
;
520 if (strcmp(update
, "force-one")==0) {
521 /* Not enough devices for a working array,
522 * so bring this one up-to-date
524 if (sb
->events
!= __cpu_to_le64(info
->events
))
526 sb
->events
= __cpu_to_le64(info
->events
);
528 if (strcmp(update
, "force-array")==0) {
529 /* Degraded array and 'force' requests to
530 * maybe need to mark it 'clean'.
532 switch(__le32_to_cpu(sb
->level
)) {
533 case 5: case 4: case 6:
534 /* need to force clean */
535 if (sb
->resync_offset
!= ~0ULL)
537 sb
->resync_offset
= ~0ULL;
540 if (strcmp(update
, "assemble")==0) {
541 int d
= info
->disk
.number
;
543 if (info
->disk
.state
== 6)
544 want
= __cpu_to_le32(info
->disk
.raid_disk
);
547 if (sb
->dev_roles
[d
] != want
) {
548 sb
->dev_roles
[d
] = want
;
552 if (strcmp(update
, "linear-grow-new") == 0) {
555 int max
= __le32_to_cpu(sb
->max_dev
);
557 for (i
=0 ; i
< max
; i
++)
558 if (__le16_to_cpu(sb
->dev_roles
[i
]) >= 0xfffe)
560 sb
->dev_number
= __cpu_to_le32(i
);
561 info
->disk
.number
= i
;
562 if (max
>= __le32_to_cpu(sb
->max_dev
))
563 sb
->max_dev
= __cpu_to_le32(max
+1);
565 if ((rfd
= open("/dev/urandom", O_RDONLY
)) < 0 ||
566 read(rfd
, sb
->device_uuid
, 16) != 16) {
567 *(__u32
*)(sb
->device_uuid
) = random();
568 *(__u32
*)(sb
->device_uuid
+4) = random();
569 *(__u32
*)(sb
->device_uuid
+8) = random();
570 *(__u32
*)(sb
->device_uuid
+12) = random();
574 __cpu_to_le16(info
->disk
.raid_disk
);
576 if (strcmp(update
, "linear-grow-update") == 0) {
577 sb
->raid_disks
= __cpu_to_le32(info
->array
.raid_disks
);
578 sb
->dev_roles
[info
->disk
.number
] =
579 __cpu_to_le16(info
->disk
.raid_disk
);
581 if (strcmp(update
, "resync") == 0) {
582 /* make sure resync happens */
583 sb
->resync_offset
= 0ULL;
585 if (strcmp(update
, "uuid") == 0) {
586 copy_uuid(sb
->set_uuid
, info
->uuid
, super1
.swapuuid
);
588 if (__le32_to_cpu(sb
->feature_map
)&MD_FEATURE_BITMAP_OFFSET
) {
589 struct bitmap_super_s
*bm
;
590 bm
= (struct bitmap_super_s
*)(sbv
+1024);
591 memcpy(bm
->uuid
, sb
->set_uuid
, 16);
594 if (strcmp(update
, "homehost") == 0 &&
598 c
= strchr(sb
->set_name
, ':');
600 strncpy(info
->name
, c
+1, 31 - (c
-sb
->set_name
));
602 strncpy(info
->name
, sb
->set_name
, 32);
605 if (strcmp(update
, "name") == 0) {
606 if (info
->name
[0] == 0)
607 sprintf(info
->name
, "%d", info
->array
.md_minor
);
608 memset(sb
->set_name
, 0, sizeof(sb
->set_name
));
610 strchr(info
->name
, ':') == NULL
&&
611 strlen(homehost
)+1+strlen(info
->name
) < 32) {
612 strcpy(sb
->set_name
, homehost
);
613 strcat(sb
->set_name
, ":");
614 strcat(sb
->set_name
, info
->name
);
616 strcpy(sb
->set_name
, info
->name
);
618 if (strcmp(update
, "devicesize") == 0 &&
619 __le64_to_cpu(sb
->super_offset
) <
620 __le64_to_cpu(sb
->data_offset
)) {
621 /* set data_size to device size less data_offset */
622 struct misc_dev_info
*misc
= (struct misc_dev_info
*)
623 (sbv
+ 1024 + sizeof(struct bitmap_super_s
));
624 printf("Size was %llu\n", (unsigned long long)
625 __le64_to_cpu(sb
->data_size
));
626 sb
->data_size
= __cpu_to_le64(
627 misc
->device_size
- __le64_to_cpu(sb
->data_offset
));
628 printf("Size is %llu\n", (unsigned long long)
629 __le64_to_cpu(sb
->data_size
));
631 if (strcmp(update
, "_reshape_progress")==0)
632 sb
->reshape_position
= __cpu_to_le64(info
->reshape_progress
);
634 sb
->sb_csum
= calc_sb_1_csum(sb
);
638 static int init_super1(struct supertype
*st
, void **sbp
, mdu_array_info_t
*info
,
639 unsigned long long size
, char *name
, char *homehost
, int *uuid
)
641 struct mdp_superblock_1
*sb
= malloc(1024 + sizeof(bitmap_super_t
) +
642 sizeof(struct misc_dev_info
));
648 if (info
->major_version
== -1) {
649 /* zeroing superblock */
654 spares
= info
->working_disks
- info
->active_disks
;
655 if (info
->raid_disks
+ spares
> 384) {
656 fprintf(stderr
, Name
": too many devices requested: %d+%d > %d\n",
657 info
->raid_disks
, spares
, 384);
661 sb
->magic
= __cpu_to_le32(MD_SB_MAGIC
);
662 sb
->major_version
= __cpu_to_le32(1);
667 copy_uuid(sb
->set_uuid
, uuid
, super1
.swapuuid
);
669 if ((rfd
= open("/dev/urandom", O_RDONLY
)) < 0 ||
670 read(rfd
, sb
->set_uuid
, 16) != 16) {
671 *(__u32
*)(sb
->set_uuid
) = random();
672 *(__u32
*)(sb
->set_uuid
+4) = random();
673 *(__u32
*)(sb
->set_uuid
+8) = random();
674 *(__u32
*)(sb
->set_uuid
+12) = random();
676 if (rfd
>= 0) close(rfd
);
679 if (name
== NULL
|| *name
== 0) {
680 sprintf(defname
, "%d", info
->md_minor
);
683 memset(sb
->set_name
, 0, 32);
685 strchr(name
, ':')== NULL
&&
686 strlen(homehost
)+1+strlen(name
) < 32) {
687 strcpy(sb
->set_name
, homehost
);
688 strcat(sb
->set_name
, ":");
689 strcat(sb
->set_name
, name
);
691 strcpy(sb
->set_name
, name
);
693 sb
->ctime
= __cpu_to_le64((unsigned long long)time(0));
694 sb
->level
= __cpu_to_le32(info
->level
);
695 sb
->layout
= __cpu_to_le32(info
->layout
);
696 sb
->size
= __cpu_to_le64(size
*2ULL);
697 sb
->chunksize
= __cpu_to_le32(info
->chunk_size
>>9);
698 sb
->raid_disks
= __cpu_to_le32(info
->raid_disks
);
700 sb
->data_offset
= __cpu_to_le64(0);
701 sb
->data_size
= __cpu_to_le64(0);
702 sb
->super_offset
= __cpu_to_le64(0);
703 sb
->recovery_offset
= __cpu_to_le64(0);
705 sb
->utime
= sb
->ctime
;
706 sb
->events
= __cpu_to_le64(1);
707 if (info
->state
& (1<<MD_SB_CLEAN
))
708 sb
->resync_offset
= ~0ULL;
710 sb
->resync_offset
= 0;
711 sb
->max_dev
= __cpu_to_le32((1024- sizeof(struct mdp_superblock_1
))/
712 sizeof(sb
->dev_roles
[0]));
713 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
715 memset(sb
->dev_roles
, 0xff, 1024 - sizeof(struct mdp_superblock_1
));
721 /* Add a device to the superblock being created */
722 static void add_to_super1(void *sbv
, mdu_disk_info_t
*dk
)
724 struct mdp_superblock_1
*sb
= sbv
;
725 __u16
*rp
= sb
->dev_roles
+ dk
->number
;
726 if ((dk
->state
& 6) == 6) /* active, sync */
727 *rp
= __cpu_to_le16(dk
->raid_disk
);
728 else if ((dk
->state
& ~2) == 0) /* active or idle -> spare */
734 static void locate_bitmap1(struct supertype
*st
, int fd
, void *sbv
);
736 static int store_super1(struct supertype
*st
, int fd
, void *sbv
)
738 struct mdp_superblock_1
*sb
= sbv
;
739 unsigned long long sb_offset
;
741 unsigned long long dsize
;
743 if (!get_dev_size(fd
, NULL
, &dsize
))
752 * Calculate the position of the superblock.
753 * It is always aligned to a 4K boundary and
754 * depending on minor_version, it can be:
755 * 0: At least 8K, but less than 12K, from end of device
756 * 1: At start of device
757 * 2: 4K from start of device.
759 switch(st
->minor_version
) {
763 sb_offset
&= ~(4*2-1);
777 if (sb_offset
!= __le64_to_cpu(sb
->super_offset
) &&
778 0 != __le64_to_cpu(sb
->super_offset
)
780 fprintf(stderr
, Name
": internal error - sb_offset is wrong\n");
784 if (lseek64(fd
, sb_offset
<< 9, 0)< 0LL)
787 sbsize
= sizeof(*sb
) + 2 * __le32_to_cpu(sb
->max_dev
);
789 if (write(fd
, sb
, sbsize
) != sbsize
)
792 if (sb
->feature_map
& __cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
)) {
793 struct bitmap_super_s
*bm
= (struct bitmap_super_s
*)
795 if (__le32_to_cpu(bm
->magic
) == BITMAP_MAGIC
) {
796 locate_bitmap1(st
, fd
, sbv
);
797 if (write(fd
, bm
, sizeof(*bm
)) != sizeof(*bm
))
805 static int load_super1(struct supertype
*st
, int fd
, void **sbp
, char *devname
);
807 static unsigned long choose_bm_space(unsigned long devsize
)
809 /* if the device is bigger than 8Gig, save 64k for bitmap usage,
810 * if bigger than 200Gig, save 128k
812 if (devsize
- 64*2 >= 200*1024*1024*2)
814 if (devsize
- 4*2 > 8*1024*1024*2)
819 static int write_init_super1(struct supertype
*st
, void *sbv
,
820 mdu_disk_info_t
*dinfo
, char *devname
)
822 struct mdp_superblock_1
*sb
= sbv
;
824 int fd
= open(devname
, O_RDWR
| O_EXCL
);
829 unsigned long long dsize
, array_size
;
834 fprintf(stderr
, Name
": Failed to open %s to write superblock\n",
839 sb
->dev_number
= __cpu_to_le32(dinfo
->number
);
840 if (dinfo
->state
& (1<<MD_DISK_WRITEMOSTLY
))
841 sb
->devflags
|= __cpu_to_le32(WriteMostly1
);
843 if ((rfd
= open("/dev/urandom", O_RDONLY
)) < 0 ||
844 read(rfd
, sb
->device_uuid
, 16) != 16) {
845 *(__u32
*)(sb
->device_uuid
) = random();
846 *(__u32
*)(sb
->device_uuid
+4) = random();
847 *(__u32
*)(sb
->device_uuid
+8) = random();
848 *(__u32
*)(sb
->device_uuid
+12) = random();
850 if (rfd
>= 0) close(rfd
);
853 if (load_super1(st
, fd
, &refsbv
, NULL
)==0) {
854 struct mdp_superblock_1
*refsb
= refsbv
;
856 memcpy(sb
->device_uuid
, refsb
->device_uuid
, 16);
857 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16)==0) {
858 /* same array, so preserve events and dev_number */
859 sb
->events
= refsb
->events
;
860 /* bugs in 2.6.17 and earlier mean the dev_number
861 * chosen in Manage must be preserved
863 if (get_linux_version() >= 2006018)
864 sb
->dev_number
= refsb
->dev_number
;
869 if (!get_dev_size(fd
, NULL
, &dsize
))
880 * Calculate the position of the superblock.
881 * It is always aligned to a 4K boundary and
882 * depending on minor_version, it can be:
883 * 0: At least 8K, but less than 12K, from end of device
884 * 1: At start of device
885 * 2: 4K from start of device.
886 * Depending on the array size, we might leave extra space
889 array_size
= __le64_to_cpu(sb
->size
);
890 /* work out how much space we left of a bitmap */
891 bm_space
= choose_bm_space(array_size
);
893 switch(st
->minor_version
) {
897 sb_offset
&= ~(4*2-1);
898 sb
->super_offset
= __cpu_to_le64(sb_offset
);
899 sb
->data_offset
= __cpu_to_le64(0);
900 sb
->data_size
= __cpu_to_le64(sb_offset
- bm_space
);
903 sb
->super_offset
= __cpu_to_le64(0);
904 sb
->data_offset
= __cpu_to_le64(bm_space
+ 4*2);
905 sb
->data_size
= __cpu_to_le64(dsize
- bm_space
- 4*2);
909 sb
->super_offset
= __cpu_to_le64(4*2);
910 sb
->data_offset
= __cpu_to_le64(4*2 + 4*2 + bm_space
);
911 sb
->data_size
= __cpu_to_le64(dsize
- 4*2 - 4*2 - bm_space
);
918 sb
->sb_csum
= calc_sb_1_csum(sb
);
919 rv
= store_super1(st
, fd
, sb
);
921 fprintf(stderr
, Name
": failed to write superblock to %s\n", devname
);
923 if (rv
== 0 && (__le32_to_cpu(sb
->feature_map
) & 1))
924 rv
= st
->ss
->write_bitmap(st
, fd
, sbv
);
929 static int compare_super1(void **firstp
, void *secondv
)
933 * 0 same, or first was empty, and second was copied
934 * 1 second had wrong number
938 struct mdp_superblock_1
*first
= *firstp
;
939 struct mdp_superblock_1
*second
= secondv
;
941 if (second
->magic
!= __cpu_to_le32(MD_SB_MAGIC
))
943 if (second
->major_version
!= __cpu_to_le32(1))
947 first
= malloc(1024+sizeof(bitmap_super_t
) +
948 sizeof(struct misc_dev_info
));
949 memcpy(first
, second
, 1024+sizeof(bitmap_super_t
) +
950 sizeof(struct misc_dev_info
));
954 if (memcmp(first
->set_uuid
, second
->set_uuid
, 16)!= 0)
957 if (first
->ctime
!= second
->ctime
||
958 first
->level
!= second
->level
||
959 first
->layout
!= second
->layout
||
960 first
->size
!= second
->size
||
961 first
->chunksize
!= second
->chunksize
||
962 first
->raid_disks
!= second
->raid_disks
)
967 static int load_super1(struct supertype
*st
, int fd
, void **sbp
, char *devname
)
969 unsigned long long dsize
;
970 unsigned long long sb_offset
;
971 struct mdp_superblock_1
*super
;
973 struct bitmap_super_s
*bsb
;
974 struct misc_dev_info
*misc
;
977 if (st
->ss
== NULL
) {
980 /* guess... choose latest ctime */
982 for (st
->minor_version
= 0; st
->minor_version
<= 2 ; st
->minor_version
++) {
983 switch(load_super1(st
, fd
, sbp
, devname
)) {
984 case 0: super
= *sbp
;
985 if (bestvers
== -1 ||
986 bestctime
< __le64_to_cpu(super
->ctime
)) {
987 bestvers
= st
->minor_version
;
988 bestctime
= __le64_to_cpu(super
->ctime
);
993 case 1: st
->ss
= NULL
; return 1; /*bad device */
994 case 2: break; /* bad, try next */
997 if (bestvers
!= -1) {
999 st
->minor_version
= bestvers
;
1002 rv
= load_super1(st
, fd
, sbp
, devname
);
1003 if (rv
) st
->ss
= NULL
;
1009 if (!get_dev_size(fd
, devname
, &dsize
))
1015 fprintf(stderr
, Name
": %s is too small for md: size is %llu sectors.\n",
1021 * Calculate the position of the superblock.
1022 * It is always aligned to a 4K boundary and
1023 * depending on minor_version, it can be:
1024 * 0: At least 8K, but less than 12K, from end of device
1025 * 1: At start of device
1026 * 2: 4K from start of device.
1028 switch(st
->minor_version
) {
1032 sb_offset
&= ~(4*2-1);
1044 ioctl(fd
, BLKFLSBUF
, 0); /* make sure we read current data */
1047 if (lseek64(fd
, sb_offset
<< 9, 0)< 0LL) {
1049 fprintf(stderr
, Name
": Cannot seek to superblock on %s: %s\n",
1050 devname
, strerror(errno
));
1054 super
= malloc(1024 + sizeof(bitmap_super_t
) +
1055 sizeof(struct misc_dev_info
));
1057 if (read(fd
, super
, 1024) != 1024) {
1059 fprintf(stderr
, Name
": Cannot read superblock on %s\n",
1065 if (__le32_to_cpu(super
->magic
) != MD_SB_MAGIC
) {
1067 fprintf(stderr
, Name
": No super block found on %s (Expected magic %08x, got %08x)\n",
1068 devname
, MD_SB_MAGIC
, __le32_to_cpu(super
->magic
));
1073 if (__le32_to_cpu(super
->major_version
) != 1) {
1075 fprintf(stderr
, Name
": Cannot interpret superblock on %s - version is %d\n",
1076 devname
, __le32_to_cpu(super
->major_version
));
1080 if (__le64_to_cpu(super
->super_offset
) != sb_offset
) {
1082 fprintf(stderr
, Name
": No superblock found on %s (super_offset is wrong)\n",
1089 bsb
= (struct bitmap_super_s
*)(((char*)super
)+1024);
1091 misc
= (struct misc_dev_info
*) (bsb
+1);
1092 misc
->device_size
= dsize
;
1094 /* Now check on the bitmap superblock */
1095 if ((__le32_to_cpu(super
->feature_map
)&MD_FEATURE_BITMAP_OFFSET
) == 0)
1097 /* Read the bitmap superblock and make sure it looks
1098 * valid. If it doesn't clear the bit. An --assemble --force
1099 * should get that written out.
1101 locate_bitmap1(st
, fd
, super
);
1102 if (read(fd
, ((char*)super
)+1024, sizeof(struct bitmap_super_s
))
1103 != sizeof(struct bitmap_super_s
))
1106 uuid_from_super1(uuid
, super
);
1107 if (__le32_to_cpu(bsb
->magic
) != BITMAP_MAGIC
||
1108 memcmp(bsb
->uuid
, uuid
, 16) != 0)
1113 super
->feature_map
= __cpu_to_le32(__le32_to_cpu(super
->feature_map
) & ~1);
1118 static struct supertype
*match_metadata_desc1(char *arg
)
1120 struct supertype
*st
= malloc(sizeof(*st
));
1125 if (strcmp(arg
, "1") == 0 ||
1126 strcmp(arg
, "1.0") == 0 ||
1127 strcmp(arg
, "default/large") == 0) {
1128 st
->minor_version
= 0;
1131 if (strcmp(arg
, "1.1") == 0) {
1132 st
->minor_version
= 1;
1135 if (strcmp(arg
, "1.2") == 0) {
1136 st
->minor_version
= 2;
1144 /* find available size on device with this devsize, using
1145 * superblock type st, and reserving 'reserve' sectors for
1148 static __u64
avail_size1(struct supertype
*st
, __u64 devsize
)
1153 devsize
-= choose_bm_space(devsize
);
1155 switch(st
->minor_version
) {
1158 return ((devsize
- 8*2 ) & ~(4*2-1));
1160 /* at start, 4K for superblock and possible bitmap */
1161 return devsize
- 4*2;
1163 /* 4k from start, 4K for superblock and possible bitmap */
1164 return devsize
- (4+4)*2;
1170 add_internal_bitmap1(struct supertype
*st
, void *sbv
,
1171 int *chunkp
, int delay
, int write_behind
,
1172 unsigned long long size
,
1173 int may_change
, int major
)
1176 * If not may_change, then this is a 'Grow', and the bitmap
1177 * must fit after the superblock.
1178 * If may_change, then this is create, and we can put the bitmap
1179 * before the superblock if we like, or may move the start.
1180 * If !may_change, the bitmap MUST live at offset of 1K, until
1181 * we get a sysfs interface.
1183 * size is in sectors, chunk is in bytes !!!
1186 unsigned long long bits
;
1187 unsigned long long max_bits
;
1188 unsigned long long min_chunk
;
1190 int chunk
= *chunkp
;
1192 struct mdp_superblock_1
*sb
= sbv
;
1193 bitmap_super_t
*bms
= (bitmap_super_t
*)(((char*)sb
) + 1024);
1195 switch(st
->minor_version
) {
1197 /* either 3K after the superblock, or some amount of space
1201 /* We are creating array, so we *know* how much room has
1205 room
= choose_bm_space(__le64_to_cpu(sb
->size
));
1207 /* make it 3K after the superblock */
1212 room
= __le64_to_cpu(sb
->super_offset
)
1213 - __le64_to_cpu(sb
->data_offset
)
1214 - __le64_to_cpu(sb
->data_size
);
1215 /* remove '1 ||' when we can set offset via sysfs */
1216 if (1 || (room
< 3*2 &&
1217 __le32_to_cpu(sb
->max_dev
) <= 384)) {
1221 offset
= 0; /* means movable offset */
1226 case 2: /* between superblock and data */
1229 room
= choose_bm_space(__le64_to_cpu(sb
->size
));
1231 room
= __le64_to_cpu(sb
->data_offset
)
1232 - __le64_to_cpu(sb
->super_offset
);
1233 if (1 || __le32_to_cpu(sb
->max_dev
) <= 384) {
1246 if (chunk
== UnSet
&& room
> 128*2)
1247 /* Limit to 128K of bitmap when chunk size not requested */
1250 max_bits
= (room
* 512 - sizeof(bitmap_super_t
)) * 8;
1252 min_chunk
= 4096; /* sub-page chunks don't work yet.. */
1253 bits
= (size
*512)/min_chunk
+1;
1254 while (bits
> max_bits
) {
1260 else if (chunk
< min_chunk
)
1261 return 0; /* chunk size too small */
1262 if (chunk
== 0) /* rounding problem */
1266 bits
= (size
*512) / chunk
+ 1;
1267 room
= ((bits
+7)/8 + sizeof(bitmap_super_t
) +511)/512;
1271 sb
->bitmap_offset
= __cpu_to_le32(offset
);
1273 sb
->feature_map
= __cpu_to_le32(__le32_to_cpu(sb
->feature_map
) | 1);
1274 memset(bms
, 0, sizeof(*bms
));
1275 bms
->magic
= __cpu_to_le32(BITMAP_MAGIC
);
1276 bms
->version
= __cpu_to_le32(major
);
1277 uuid_from_super1((int*)bms
->uuid
, sb
);
1278 bms
->chunksize
= __cpu_to_le32(chunk
);
1279 bms
->daemon_sleep
= __cpu_to_le32(delay
);
1280 bms
->sync_size
= __cpu_to_le64(size
);
1281 bms
->write_behind
= __cpu_to_le32(write_behind
);
1288 static void locate_bitmap1(struct supertype
*st
, int fd
, void *sbv
)
1290 unsigned long long offset
;
1291 struct mdp_superblock_1
*sb
;
1295 if (st
->ss
->load_super(st
, fd
, &sbv
, NULL
))
1296 return; /* no error I hope... */
1301 offset
= __le64_to_cpu(sb
->super_offset
);
1302 offset
+= (int32_t) __le32_to_cpu(sb
->bitmap_offset
);
1305 lseek64(fd
, offset
<<9, 0);
1308 static int write_bitmap1(struct supertype
*st
, int fd
, void *sbv
)
1310 struct mdp_superblock_1
*sb
= sbv
;
1311 bitmap_super_t
*bms
= (bitmap_super_t
*)(((char*)sb
)+1024);
1317 locate_bitmap1(st
, fd
, sbv
);
1319 if (write(fd
, ((char*)sb
)+1024, sizeof(bitmap_super_t
)) !=
1320 sizeof(bitmap_super_t
))
1322 towrite
= __le64_to_cpu(bms
->sync_size
) / (__le32_to_cpu(bms
->chunksize
)>>9);
1323 towrite
= (towrite
+7) >> 3; /* bits to bytes */
1324 memset(buf
, 0xff, sizeof(buf
));
1325 while (towrite
> 0) {
1327 if (n
> sizeof(buf
))
1329 n
= write(fd
, buf
, n
);
1342 struct superswitch super1
= {
1344 .examine_super
= examine_super1
,
1345 .brief_examine_super
= brief_examine_super1
,
1346 .detail_super
= detail_super1
,
1347 .brief_detail_super
= brief_detail_super1
,
1348 .export_super
= export_super1
,
1350 .match_home
= match_home1
,
1351 .uuid_from_super
= uuid_from_super1
,
1352 .getinfo_super
= getinfo_super1
,
1353 .update_super
= update_super1
,
1354 .init_super
= init_super1
,
1355 .add_to_super
= add_to_super1
,
1356 .store_super
= store_super1
,
1357 .write_init_super
= write_init_super1
,
1358 .compare_super
= compare_super1
,
1359 .load_super
= load_super1
,
1360 .match_metadata_desc
= match_metadata_desc1
,
1361 .avail_size
= avail_size1
,
1362 .add_internal_bitmap
= add_internal_bitmap1
,
1363 .locate_bitmap
= locate_bitmap1
,
1364 .write_bitmap
= write_bitmap1
,
1366 #if __BYTE_ORDER == BIG_ENDIAN