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(struct supertype
*st
, char *homehost
)
147 struct mdp_superblock_1
*sb
= st
->sb
;
153 int l
= homehost
? strlen(homehost
) : 0;
155 unsigned long long sb_offset
;
157 printf(" Magic : %08x\n", __le32_to_cpu(sb
->magic
));
158 printf(" Version : 1");
159 sb_offset
= __le64_to_cpu(sb
->super_offset
);
162 else if (sb_offset
<= 8)
166 printf(" Feature Map : 0x%x\n", __le32_to_cpu(sb
->feature_map
));
167 printf(" Array UUID : ");
168 for (i
=0; i
<16; i
++) {
169 if ((i
&3)==0 && i
!= 0) printf(":");
170 printf("%02x", sb
->set_uuid
[i
]);
173 printf(" Name : %.32s", sb
->set_name
);
174 if (l
> 0 && l
< 32 &&
175 sb
->set_name
[l
] == ':' &&
176 strncmp(sb
->set_name
, homehost
, l
) == 0)
177 printf(" (local to host %s)", homehost
);
179 atime
= __le64_to_cpu(sb
->ctime
) & 0xFFFFFFFFFFULL
;
180 printf(" Creation Time : %.24s\n", ctime(&atime
));
181 c
=map_num(pers
, __le32_to_cpu(sb
->level
));
182 printf(" Raid Level : %s\n", c
?c
:"-unknown-");
183 printf(" Raid Devices : %d\n", __le32_to_cpu(sb
->raid_disks
));
185 printf(" Avail Dev Size : %llu%s\n",
186 (unsigned long long)__le64_to_cpu(sb
->data_size
),
187 human_size(__le64_to_cpu(sb
->data_size
)<<9));
188 if (__le32_to_cpu(sb
->level
) >= 0) {
190 switch(__le32_to_cpu(sb
->level
)) {
191 case 1: ddsks
=1;break;
193 case 5: ddsks
= __le32_to_cpu(sb
->raid_disks
)-1; break;
194 case 6: ddsks
= __le32_to_cpu(sb
->raid_disks
)-2; break;
196 layout
= __le32_to_cpu(sb
->layout
);
197 ddsks
= __le32_to_cpu(sb
->raid_disks
)
198 / (layout
&255) / ((layout
>>8)&255);
201 printf(" Array Size : %llu%s\n",
202 ddsks
*(unsigned long long)__le64_to_cpu(sb
->size
),
203 human_size(ddsks
*__le64_to_cpu(sb
->size
)<<9));
204 if (sb
->size
!= sb
->data_size
)
205 printf(" Used Dev Size : %llu%s\n",
206 (unsigned long long)__le64_to_cpu(sb
->size
),
207 human_size(__le64_to_cpu(sb
->size
)<<9));
210 printf(" Data Offset : %llu sectors\n",
211 (unsigned long long)__le64_to_cpu(sb
->data_offset
));
212 printf(" Super Offset : %llu sectors\n",
213 (unsigned long long)__le64_to_cpu(sb
->super_offset
));
214 if (__le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RECOVERY_OFFSET
)
215 printf("Recovery Offset : %llu sectors\n", (unsigned long long)__le64_to_cpu(sb
->recovery_offset
));
216 printf(" State : %s\n", (__le64_to_cpu(sb
->resync_offset
)+1)? "active":"clean");
217 printf(" Device UUID : ");
218 for (i
=0; i
<16; i
++) {
219 if ((i
&3)==0 && i
!= 0) printf(":");
220 printf("%02x", sb
->device_uuid
[i
]);
224 if (sb
->feature_map
& __cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
)) {
225 printf("Internal Bitmap : %ld sectors from superblock\n",
226 (long)(int32_t)__le32_to_cpu(sb
->bitmap_offset
));
228 if (sb
->feature_map
& __le32_to_cpu(MD_FEATURE_RESHAPE_ACTIVE
)) {
229 printf(" Reshape pos'n : %llu%s\n", (unsigned long long)__le64_to_cpu(sb
->reshape_position
)/2,
230 human_size(__le64_to_cpu(sb
->reshape_position
)<<9));
231 if (__le32_to_cpu(sb
->delta_disks
)) {
232 printf(" Delta Devices : %d", __le32_to_cpu(sb
->delta_disks
));
233 if (__le32_to_cpu(sb
->delta_disks
))
234 printf(" (%d->%d)\n",
235 __le32_to_cpu(sb
->raid_disks
)-__le32_to_cpu(sb
->delta_disks
),
236 __le32_to_cpu(sb
->raid_disks
));
238 printf(" (%d->%d)\n", __le32_to_cpu(sb
->raid_disks
),
239 __le32_to_cpu(sb
->raid_disks
)+__le32_to_cpu(sb
->delta_disks
));
241 if (__le32_to_cpu(sb
->new_level
) != __le32_to_cpu(sb
->level
)) {
242 c
= map_num(pers
, __le32_to_cpu(sb
->new_level
));
243 printf(" New Level : %s\n", c
?c
:"-unknown-");
245 if (__le32_to_cpu(sb
->new_layout
) != __le32_to_cpu(sb
->layout
)) {
246 if (__le32_to_cpu(sb
->level
) == 5) {
247 c
= map_num(r5layout
, __le32_to_cpu(sb
->new_layout
));
248 printf(" New Layout : %s\n", c
?c
:"-unknown-");
250 if (__le32_to_cpu(sb
->level
) == 10) {
251 printf(" New Layout :");
252 print_r10_layout(__le32_to_cpu(sb
->new_layout
));
256 if (__le32_to_cpu(sb
->new_chunk
) != __le32_to_cpu(sb
->chunksize
))
257 printf(" New Chunksize : %dK\n", __le32_to_cpu(sb
->new_chunk
)/2);
262 if (sb
->devflags
& WriteMostly1
)
263 printf(" write-mostly");
267 atime
= __le64_to_cpu(sb
->utime
) & 0xFFFFFFFFFFULL
;
268 printf(" Update Time : %.24s\n", ctime(&atime
));
270 if (calc_sb_1_csum(sb
) == sb
->sb_csum
)
271 printf(" Checksum : %x - correct\n", __le32_to_cpu(sb
->sb_csum
));
273 printf(" Checksum : %x - expected %x\n", __le32_to_cpu(sb
->sb_csum
),
274 __le32_to_cpu(calc_sb_1_csum(sb
)));
275 printf(" Events : %llu\n", (unsigned long long)__le64_to_cpu(sb
->events
));
277 if (__le32_to_cpu(sb
->level
) == 5) {
278 c
= map_num(r5layout
, __le32_to_cpu(sb
->layout
));
279 printf(" Layout : %s\n", c
?c
:"-unknown-");
281 if (__le32_to_cpu(sb
->level
) == 10) {
282 int lo
= __le32_to_cpu(sb
->layout
);
284 print_r10_layout(lo
);
287 switch(__le32_to_cpu(sb
->level
)) {
293 printf(" Chunk Size : %dK\n", __le32_to_cpu(sb
->chunksize
)/2);
296 printf(" Rounding : %dK\n", __le32_to_cpu(sb
->chunksize
)/2);
301 printf(" Array Slot : %d (", __le32_to_cpu(sb
->dev_number
));
302 for (i
= __le32_to_cpu(sb
->max_dev
); i
> 0 ; i
--)
303 if (__le16_to_cpu(sb
->dev_roles
[i
-1]) != 0xffff)
305 for (d
=0; d
< i
; d
++) {
306 int role
= __le16_to_cpu(sb
->dev_roles
[d
]);
308 if (role
== 0xffff) printf("empty");
309 else if(role
== 0xfffe) printf("failed");
310 else printf("%d", role
);
313 printf(" Array State : ");
314 for (d
=0; d
<__le32_to_cpu(sb
->raid_disks
); d
++) {
318 for (i
=0; i
< __le32_to_cpu(sb
->max_dev
); i
++) {
319 int role
= __le16_to_cpu(sb
->dev_roles
[i
]);
321 if (i
== __le32_to_cpu(sb
->dev_number
))
326 if (cnt
> 1) printf("?");
327 else if (cnt
== 1 && me
) printf("U");
328 else if (cnt
== 1) printf("u");
332 for (i
=0; i
< __le32_to_cpu(sb
->max_dev
); i
++) {
333 int role
= __le16_to_cpu(sb
->dev_roles
[i
]);
337 if (faulty
) printf(" %d failed", faulty
);
342 static void brief_examine_super1(struct supertype
*st
)
344 struct mdp_superblock_1
*sb
= st
->sb
;
346 unsigned long long sb_offset
;
348 char *c
=map_num(pers
, __le32_to_cpu(sb
->level
));
350 nm
= strchr(sb
->set_name
, ':');
353 else if (sb
->set_name
[0])
358 printf("ARRAY /dev/md/%s level=%s ", nm
, c
?c
:"-unknown-");
359 sb_offset
= __le64_to_cpu(sb
->super_offset
);
361 printf("metadata=1.1 ");
362 else if (sb_offset
<= 8)
363 printf("metadata=1.2 ");
365 printf("metadata=1.0 ");
366 printf("num-devices=%d UUID=", __le32_to_cpu(sb
->raid_disks
));
367 for (i
=0; i
<16; i
++) {
368 if ((i
&3)==0 && i
!= 0) printf(":");
369 printf("%02x", sb
->set_uuid
[i
]);
372 printf(" name=%.32s", sb
->set_name
);
376 static void export_examine_super1(struct supertype
*st
)
378 struct mdp_superblock_1
*sb
= st
->sb
;
382 printf("MD_LEVEL=%s\n", map_num(pers
, __le32_to_cpu(sb
->level
)));
383 printf("MD_DEVICES=%d\n", __le32_to_cpu(sb
->raid_disks
));
385 if (sb
->set_name
[i
] == '\n' ||
386 sb
->set_name
[i
] == '\0') {
391 printf("MD_NAME=%.*s\n", len
, sb
->set_name
);
393 for (i
=0; i
<16; i
++) {
394 if ((i
&3)==0 && i
!= 0) printf(":");
395 printf("%02x", sb
->set_uuid
[i
]);
398 printf("MD_UPDATE_TIME=%llu\n",
399 __le64_to_cpu(sb
->utime
) & 0xFFFFFFFFFFULL
);
400 printf("MD_DEV_UUID=");
401 for (i
=0; i
<16; i
++) {
402 if ((i
&3)==0 && i
!= 0) printf(":");
403 printf("%02x", sb
->device_uuid
[i
]);
406 printf("MD_EVENTS=%llu\n",
407 (unsigned long long)__le64_to_cpu(sb
->events
));
410 static void detail_super1(struct supertype
*st
, char *homehost
)
412 struct mdp_superblock_1
*sb
= st
->sb
;
414 int l
= homehost
? strlen(homehost
) : 0;
416 printf(" Name : %.32s", sb
->set_name
);
417 if (l
> 0 && l
< 32 &&
418 sb
->set_name
[l
] == ':' &&
419 strncmp(sb
->set_name
, homehost
, l
) == 0)
420 printf(" (local to host %s)", homehost
);
421 printf("\n UUID : ");
422 for (i
=0; i
<16; i
++) {
423 if ((i
&3)==0 && i
!= 0) printf(":");
424 printf("%02x", sb
->set_uuid
[i
]);
426 printf("\n Events : %llu\n\n", (unsigned long long)__le64_to_cpu(sb
->events
));
429 static void brief_detail_super1(struct supertype
*st
)
431 struct mdp_superblock_1
*sb
= st
->sb
;
435 printf(" name=%.32s", sb
->set_name
);
437 for (i
=0; i
<16; i
++) {
438 if ((i
&3)==0 && i
!= 0) printf(":");
439 printf("%02x", sb
->set_uuid
[i
]);
443 static void export_detail_super1(struct supertype
*st
)
445 struct mdp_superblock_1
*sb
= st
->sb
;
450 if (sb
->set_name
[i
] == '\n' ||
451 sb
->set_name
[i
] == '\0') {
456 printf("MD_NAME=%.*s\n", len
, sb
->set_name
);
458 for (i
=0; i
<16; i
++) {
459 if ((i
&3)==0 && i
!= 0) printf(":");
460 printf("%02x", sb
->set_uuid
[i
]);
467 static int match_home1(struct supertype
*st
, char *homehost
)
469 struct mdp_superblock_1
*sb
= st
->sb
;
470 int l
= homehost
? strlen(homehost
) : 0;
472 return (l
> 0 && l
< 32 &&
473 sb
->set_name
[l
] == ':' &&
474 strncmp(sb
->set_name
, homehost
, l
) == 0);
477 static void uuid_from_super1(struct supertype
*st
, int uuid
[4])
479 struct mdp_superblock_1
*super
= st
->sb
;
480 char *cuuid
= (char*)uuid
;
483 cuuid
[i
] = super
->set_uuid
[i
];
486 static void getinfo_super1(struct supertype
*st
, struct mdinfo
*info
)
488 struct mdp_superblock_1
*sb
= st
->sb
;
493 info
->array
.major_version
= 1;
494 info
->array
.minor_version
= __le32_to_cpu(sb
->feature_map
);
495 info
->array
.patch_version
= 0;
496 info
->array
.raid_disks
= __le32_to_cpu(sb
->raid_disks
);
497 info
->array
.level
= __le32_to_cpu(sb
->level
);
498 info
->array
.layout
= __le32_to_cpu(sb
->layout
);
499 info
->array
.md_minor
= -1;
500 info
->array
.ctime
= __le64_to_cpu(sb
->ctime
);
501 info
->array
.utime
= __le64_to_cpu(sb
->utime
);
502 info
->array
.chunk_size
= __le32_to_cpu(sb
->chunksize
)*512;
504 (__le64_to_cpu(sb
->resync_offset
) >= __le64_to_cpu(sb
->size
))
507 info
->data_offset
= __le64_to_cpu(sb
->data_offset
);
508 info
->component_size
= __le64_to_cpu(sb
->size
);
510 info
->disk
.major
= 0;
511 info
->disk
.minor
= 0;
512 info
->disk
.number
= __le32_to_cpu(sb
->dev_number
);
513 if (__le32_to_cpu(sb
->dev_number
) >= __le32_to_cpu(sb
->max_dev
) ||
514 __le32_to_cpu(sb
->max_dev
) > 512)
517 role
= __le16_to_cpu(sb
->dev_roles
[__le32_to_cpu(sb
->dev_number
)]);
519 info
->disk
.raid_disk
= -1;
522 info
->disk
.state
= 2; /* spare: ACTIVE, not sync, not faulty */
525 info
->disk
.state
= 1; /* faulty */
528 info
->disk
.state
= 6; /* active and in sync */
529 info
->disk
.raid_disk
= role
;
531 info
->events
= __le64_to_cpu(sb
->events
);
533 memcpy(info
->uuid
, sb
->set_uuid
, 16);
535 strncpy(info
->name
, sb
->set_name
, 32);
538 if (sb
->feature_map
& __le32_to_cpu(MD_FEATURE_RESHAPE_ACTIVE
)) {
539 info
->reshape_active
= 1;
540 info
->reshape_progress
= __le64_to_cpu(sb
->reshape_position
);
541 info
->new_level
= __le32_to_cpu(sb
->new_level
);
542 info
->delta_disks
= __le32_to_cpu(sb
->delta_disks
);
543 info
->new_layout
= __le32_to_cpu(sb
->new_layout
);
544 info
->new_chunk
= __le32_to_cpu(sb
->new_chunk
)<<9;
546 info
->reshape_active
= 0;
548 for (i
=0; i
< __le32_to_cpu(sb
->max_dev
); i
++) {
549 role
= __le16_to_cpu(sb
->dev_roles
[i
]);
550 if (/*role == 0xFFFF || */role
< info
->array
.raid_disks
)
554 info
->array
.working_disks
= working
;
557 static int update_super1(struct supertype
*st
, struct mdinfo
*info
,
559 char *devname
, int verbose
,
560 int uuid_set
, char *homehost
)
562 /* NOTE: for 'assemble' and 'force' we need to return non-zero if any change was made.
563 * For others, the return value is ignored.
566 struct mdp_superblock_1
*sb
= st
->sb
;
568 if (strcmp(update
, "force-one")==0) {
569 /* Not enough devices for a working array,
570 * so bring this one up-to-date
572 if (sb
->events
!= __cpu_to_le64(info
->events
))
574 sb
->events
= __cpu_to_le64(info
->events
);
576 if (strcmp(update
, "force-array")==0) {
577 /* Degraded array and 'force' requests to
578 * maybe need to mark it 'clean'.
580 switch(__le32_to_cpu(sb
->level
)) {
581 case 5: case 4: case 6:
582 /* need to force clean */
583 if (sb
->resync_offset
!= ~0ULL)
585 sb
->resync_offset
= ~0ULL;
588 if (strcmp(update
, "assemble")==0) {
589 int d
= info
->disk
.number
;
591 if (info
->disk
.state
== 6)
592 want
= __cpu_to_le32(info
->disk
.raid_disk
);
595 if (sb
->dev_roles
[d
] != want
) {
596 sb
->dev_roles
[d
] = want
;
600 if (strcmp(update
, "linear-grow-new") == 0) {
603 int max
= __le32_to_cpu(sb
->max_dev
);
605 for (i
=0 ; i
< max
; i
++)
606 if (__le16_to_cpu(sb
->dev_roles
[i
]) >= 0xfffe)
608 sb
->dev_number
= __cpu_to_le32(i
);
609 info
->disk
.number
= i
;
610 if (max
>= __le32_to_cpu(sb
->max_dev
))
611 sb
->max_dev
= __cpu_to_le32(max
+1);
613 if ((rfd
= open("/dev/urandom", O_RDONLY
)) < 0 ||
614 read(rfd
, sb
->device_uuid
, 16) != 16) {
615 *(__u32
*)(sb
->device_uuid
) = random();
616 *(__u32
*)(sb
->device_uuid
+4) = random();
617 *(__u32
*)(sb
->device_uuid
+8) = random();
618 *(__u32
*)(sb
->device_uuid
+12) = random();
622 __cpu_to_le16(info
->disk
.raid_disk
);
624 if (strcmp(update
, "linear-grow-update") == 0) {
625 sb
->raid_disks
= __cpu_to_le32(info
->array
.raid_disks
);
626 sb
->dev_roles
[info
->disk
.number
] =
627 __cpu_to_le16(info
->disk
.raid_disk
);
629 if (strcmp(update
, "resync") == 0) {
630 /* make sure resync happens */
631 sb
->resync_offset
= 0ULL;
633 if (strcmp(update
, "uuid") == 0) {
634 copy_uuid(sb
->set_uuid
, info
->uuid
, super1
.swapuuid
);
636 if (__le32_to_cpu(sb
->feature_map
)&MD_FEATURE_BITMAP_OFFSET
) {
637 struct bitmap_super_s
*bm
;
638 bm
= (struct bitmap_super_s
*)(st
->sb
+1024);
639 memcpy(bm
->uuid
, sb
->set_uuid
, 16);
642 if (strcmp(update
, "homehost") == 0 &&
646 c
= strchr(sb
->set_name
, ':');
648 strncpy(info
->name
, c
+1, 31 - (c
-sb
->set_name
));
650 strncpy(info
->name
, sb
->set_name
, 32);
653 if (strcmp(update
, "name") == 0) {
654 if (info
->name
[0] == 0)
655 sprintf(info
->name
, "%d", info
->array
.md_minor
);
656 memset(sb
->set_name
, 0, sizeof(sb
->set_name
));
658 strchr(info
->name
, ':') == NULL
&&
659 strlen(homehost
)+1+strlen(info
->name
) < 32) {
660 strcpy(sb
->set_name
, homehost
);
661 strcat(sb
->set_name
, ":");
662 strcat(sb
->set_name
, info
->name
);
664 strcpy(sb
->set_name
, info
->name
);
666 if (strcmp(update
, "devicesize") == 0 &&
667 __le64_to_cpu(sb
->super_offset
) <
668 __le64_to_cpu(sb
->data_offset
)) {
669 /* set data_size to device size less data_offset */
670 struct misc_dev_info
*misc
= (struct misc_dev_info
*)
671 (st
->sb
+ 1024 + sizeof(struct bitmap_super_s
));
672 printf("Size was %llu\n", (unsigned long long)
673 __le64_to_cpu(sb
->data_size
));
674 sb
->data_size
= __cpu_to_le64(
675 misc
->device_size
- __le64_to_cpu(sb
->data_offset
));
676 printf("Size is %llu\n", (unsigned long long)
677 __le64_to_cpu(sb
->data_size
));
679 if (strcmp(update
, "_reshape_progress")==0)
680 sb
->reshape_position
= __cpu_to_le64(info
->reshape_progress
);
682 sb
->sb_csum
= calc_sb_1_csum(sb
);
686 static int init_super1(struct supertype
*st
, mdu_array_info_t
*info
,
687 unsigned long long size
, char *name
, char *homehost
, int *uuid
)
689 struct mdp_superblock_1
*sb
= malloc(1024 + sizeof(bitmap_super_t
) +
690 sizeof(struct misc_dev_info
));
697 if (info
->major_version
== -1) {
698 /* zeroing superblock */
702 spares
= info
->working_disks
- info
->active_disks
;
703 if (info
->raid_disks
+ spares
> 384) {
704 fprintf(stderr
, Name
": too many devices requested: %d+%d > %d\n",
705 info
->raid_disks
, spares
, 384);
709 sb
->magic
= __cpu_to_le32(MD_SB_MAGIC
);
710 sb
->major_version
= __cpu_to_le32(1);
715 copy_uuid(sb
->set_uuid
, uuid
, super1
.swapuuid
);
717 if ((rfd
= open("/dev/urandom", O_RDONLY
)) < 0 ||
718 read(rfd
, sb
->set_uuid
, 16) != 16) {
719 *(__u32
*)(sb
->set_uuid
) = random();
720 *(__u32
*)(sb
->set_uuid
+4) = random();
721 *(__u32
*)(sb
->set_uuid
+8) = random();
722 *(__u32
*)(sb
->set_uuid
+12) = random();
724 if (rfd
>= 0) close(rfd
);
727 if (name
== NULL
|| *name
== 0) {
728 sprintf(defname
, "%d", info
->md_minor
);
731 memset(sb
->set_name
, 0, 32);
733 strchr(name
, ':')== NULL
&&
734 strlen(homehost
)+1+strlen(name
) < 32) {
735 strcpy(sb
->set_name
, homehost
);
736 strcat(sb
->set_name
, ":");
737 strcat(sb
->set_name
, name
);
739 strcpy(sb
->set_name
, name
);
741 sb
->ctime
= __cpu_to_le64((unsigned long long)time(0));
742 sb
->level
= __cpu_to_le32(info
->level
);
743 sb
->layout
= __cpu_to_le32(info
->layout
);
744 sb
->size
= __cpu_to_le64(size
*2ULL);
745 sb
->chunksize
= __cpu_to_le32(info
->chunk_size
>>9);
746 sb
->raid_disks
= __cpu_to_le32(info
->raid_disks
);
748 sb
->data_offset
= __cpu_to_le64(0);
749 sb
->data_size
= __cpu_to_le64(0);
750 sb
->super_offset
= __cpu_to_le64(0);
751 sb
->recovery_offset
= __cpu_to_le64(0);
753 sb
->utime
= sb
->ctime
;
754 sb
->events
= __cpu_to_le64(1);
755 if (info
->state
& (1<<MD_SB_CLEAN
))
756 sb
->resync_offset
= ~0ULL;
758 sb
->resync_offset
= 0;
759 sb
->max_dev
= __cpu_to_le32((1024- sizeof(struct mdp_superblock_1
))/
760 sizeof(sb
->dev_roles
[0]));
761 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
763 memset(sb
->dev_roles
, 0xff, 1024 - sizeof(struct mdp_superblock_1
));
768 /* Add a device to the superblock being created */
769 static void add_to_super1(struct supertype
*st
, mdu_disk_info_t
*dk
)
771 struct mdp_superblock_1
*sb
= st
->sb
;
772 __u16
*rp
= sb
->dev_roles
+ dk
->number
;
773 if ((dk
->state
& 6) == 6) /* active, sync */
774 *rp
= __cpu_to_le16(dk
->raid_disk
);
775 else if ((dk
->state
& ~2) == 0) /* active or idle -> spare */
781 static void locate_bitmap1(struct supertype
*st
, int fd
);
783 static int store_super1(struct supertype
*st
, int fd
)
785 struct mdp_superblock_1
*sb
= st
->sb
;
786 unsigned long long sb_offset
;
788 unsigned long long dsize
;
790 if (!get_dev_size(fd
, NULL
, &dsize
))
799 * Calculate the position of the superblock.
800 * It is always aligned to a 4K boundary and
801 * depending on minor_version, it can be:
802 * 0: At least 8K, but less than 12K, from end of device
803 * 1: At start of device
804 * 2: 4K from start of device.
806 switch(st
->minor_version
) {
810 sb_offset
&= ~(4*2-1);
824 if (sb_offset
!= __le64_to_cpu(sb
->super_offset
) &&
825 0 != __le64_to_cpu(sb
->super_offset
)
827 fprintf(stderr
, Name
": internal error - sb_offset is wrong\n");
831 if (lseek64(fd
, sb_offset
<< 9, 0)< 0LL)
834 sbsize
= sizeof(*sb
) + 2 * __le32_to_cpu(sb
->max_dev
);
836 if (write(fd
, sb
, sbsize
) != sbsize
)
839 if (sb
->feature_map
& __cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
)) {
840 struct bitmap_super_s
*bm
= (struct bitmap_super_s
*)
842 if (__le32_to_cpu(bm
->magic
) == BITMAP_MAGIC
) {
843 locate_bitmap1(st
, fd
);
844 if (write(fd
, bm
, sizeof(*bm
)) != sizeof(*bm
))
852 static int load_super1(struct supertype
*st
, int fd
, char *devname
);
854 static unsigned long choose_bm_space(unsigned long devsize
)
856 /* if the device is bigger than 8Gig, save 64k for bitmap usage,
857 * if bigger than 200Gig, save 128k
859 if (devsize
< 64*2) return 0;
860 if (devsize
- 64*2 >= 200*1024*1024*2)
862 if (devsize
- 4*2 > 8*1024*1024*2)
867 static int write_init_super1(struct supertype
*st
,
868 mdu_disk_info_t
*dinfo
, char *devname
)
870 struct mdp_superblock_1
*sb
= st
->sb
;
871 struct supertype refst
;
872 int fd
= open(devname
, O_RDWR
| O_EXCL
);
877 unsigned long long dsize
, array_size
;
882 fprintf(stderr
, Name
": Failed to open %s to write superblock\n",
887 sb
->dev_number
= __cpu_to_le32(dinfo
->number
);
888 if (dinfo
->state
& (1<<MD_DISK_WRITEMOSTLY
))
889 sb
->devflags
|= __cpu_to_le32(WriteMostly1
);
891 if ((rfd
= open("/dev/urandom", O_RDONLY
)) < 0 ||
892 read(rfd
, sb
->device_uuid
, 16) != 16) {
893 *(__u32
*)(sb
->device_uuid
) = random();
894 *(__u32
*)(sb
->device_uuid
+4) = random();
895 *(__u32
*)(sb
->device_uuid
+8) = random();
896 *(__u32
*)(sb
->device_uuid
+12) = random();
898 if (rfd
>= 0) close(rfd
);
903 if (load_super1(&refst
, fd
, NULL
)==0) {
904 struct mdp_superblock_1
*refsb
= refst
.sb
;
906 memcpy(sb
->device_uuid
, refsb
->device_uuid
, 16);
907 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16)==0) {
908 /* same array, so preserve events and dev_number */
909 sb
->events
= refsb
->events
;
910 /* bugs in 2.6.17 and earlier mean the dev_number
911 * chosen in Manage must be preserved
913 if (get_linux_version() >= 2006018)
914 sb
->dev_number
= refsb
->dev_number
;
919 if (!get_dev_size(fd
, NULL
, &dsize
))
930 * Calculate the position of the superblock.
931 * It is always aligned to a 4K boundary and
932 * depending on minor_version, it can be:
933 * 0: At least 8K, but less than 12K, from end of device
934 * 1: At start of device
935 * 2: 4K from start of device.
936 * Depending on the array size, we might leave extra space
939 array_size
= __le64_to_cpu(sb
->size
);
940 /* work out how much space we left for a bitmap */
941 bm_space
= choose_bm_space(array_size
);
943 switch(st
->minor_version
) {
947 sb_offset
&= ~(4*2-1);
948 sb
->super_offset
= __cpu_to_le64(sb_offset
);
949 sb
->data_offset
= __cpu_to_le64(0);
950 if (sb_offset
- bm_space
< array_size
)
951 bm_space
= sb_offset
- array_size
;
952 sb
->data_size
= __cpu_to_le64(sb_offset
- bm_space
);
955 sb
->super_offset
= __cpu_to_le64(0);
956 if (4*2 + bm_space
+ __le64_to_cpu(sb
->size
) > dsize
)
957 bm_space
= dsize
- __le64_to_cpu(sb
->size
) - 4*2;
958 sb
->data_offset
= __cpu_to_le64(bm_space
+ 4*2);
959 sb
->data_size
= __cpu_to_le64(dsize
- bm_space
- 4*2);
963 sb
->super_offset
= __cpu_to_le64(4*2);
964 if (4*2 + 4*2 + bm_space
+ __le64_to_cpu(sb
->size
) > dsize
)
965 bm_space
= dsize
- __le64_to_cpu(sb
->size
) - 4*2 - 4*2;
966 sb
->data_offset
= __cpu_to_le64(4*2 + 4*2 + bm_space
);
967 sb
->data_size
= __cpu_to_le64(dsize
- 4*2 - 4*2 - bm_space
);
974 sb
->sb_csum
= calc_sb_1_csum(sb
);
975 rv
= store_super1(st
, fd
);
977 fprintf(stderr
, Name
": failed to write superblock to %s\n", devname
);
979 if (rv
== 0 && (__le32_to_cpu(sb
->feature_map
) & 1))
980 rv
= st
->ss
->write_bitmap(st
, fd
);
985 static int compare_super1(struct supertype
*st
, struct supertype
*tst
)
989 * 0 same, or first was empty, and second was copied
990 * 1 second had wrong number
994 struct mdp_superblock_1
*first
= st
->sb
;
995 struct mdp_superblock_1
*second
= tst
->sb
;
997 if (second
->magic
!= __cpu_to_le32(MD_SB_MAGIC
))
999 if (second
->major_version
!= __cpu_to_le32(1))
1003 first
= malloc(1024+sizeof(bitmap_super_t
) +
1004 sizeof(struct misc_dev_info
));
1005 memcpy(first
, second
, 1024+sizeof(bitmap_super_t
) +
1006 sizeof(struct misc_dev_info
));
1010 if (memcmp(first
->set_uuid
, second
->set_uuid
, 16)!= 0)
1013 if (first
->ctime
!= second
->ctime
||
1014 first
->level
!= second
->level
||
1015 first
->layout
!= second
->layout
||
1016 first
->size
!= second
->size
||
1017 first
->chunksize
!= second
->chunksize
||
1018 first
->raid_disks
!= second
->raid_disks
)
1023 static void free_super1(struct supertype
*st
);
1025 static int load_super1(struct supertype
*st
, int fd
, char *devname
)
1027 unsigned long long dsize
;
1028 unsigned long long sb_offset
;
1029 struct mdp_superblock_1
*super
;
1031 struct bitmap_super_s
*bsb
;
1032 struct misc_dev_info
*misc
;
1036 if (st
->ss
== NULL
|| st
->minor_version
== -1) {
1038 struct supertype tst
;
1039 __u64 bestctime
= 0;
1040 /* guess... choose latest ctime */
1043 for (tst
.minor_version
= 0; tst
.minor_version
<= 2 ; tst
.minor_version
++) {
1044 switch(load_super1(&tst
, fd
, devname
)) {
1045 case 0: super
= tst
.sb
;
1046 if (bestvers
== -1 ||
1047 bestctime
< __le64_to_cpu(super
->ctime
)) {
1048 bestvers
= tst
.minor_version
;
1049 bestctime
= __le64_to_cpu(super
->ctime
);
1054 case 1: return 1; /*bad device */
1055 case 2: break; /* bad, try next */
1058 if (bestvers
!= -1) {
1060 tst
.minor_version
= bestvers
;
1063 rv
= load_super1(&tst
, fd
, devname
);
1070 if (!get_dev_size(fd
, devname
, &dsize
))
1076 fprintf(stderr
, Name
": %s is too small for md: size is %llu sectors.\n",
1082 * Calculate the position of the superblock.
1083 * It is always aligned to a 4K boundary and
1084 * depending on minor_version, it can be:
1085 * 0: At least 8K, but less than 12K, from end of device
1086 * 1: At start of device
1087 * 2: 4K from start of device.
1089 switch(st
->minor_version
) {
1093 sb_offset
&= ~(4*2-1);
1105 ioctl(fd
, BLKFLSBUF
, 0); /* make sure we read current data */
1108 if (lseek64(fd
, sb_offset
<< 9, 0)< 0LL) {
1110 fprintf(stderr
, Name
": Cannot seek to superblock on %s: %s\n",
1111 devname
, strerror(errno
));
1115 super
= malloc(1024 + sizeof(bitmap_super_t
) +
1116 sizeof(struct misc_dev_info
));
1118 if (read(fd
, super
, 1024) != 1024) {
1120 fprintf(stderr
, Name
": Cannot read superblock on %s\n",
1126 if (__le32_to_cpu(super
->magic
) != MD_SB_MAGIC
) {
1128 fprintf(stderr
, Name
": No super block found on %s (Expected magic %08x, got %08x)\n",
1129 devname
, MD_SB_MAGIC
, __le32_to_cpu(super
->magic
));
1134 if (__le32_to_cpu(super
->major_version
) != 1) {
1136 fprintf(stderr
, Name
": Cannot interpret superblock on %s - version is %d\n",
1137 devname
, __le32_to_cpu(super
->major_version
));
1141 if (__le64_to_cpu(super
->super_offset
) != sb_offset
) {
1143 fprintf(stderr
, Name
": No superblock found on %s (super_offset is wrong)\n",
1150 bsb
= (struct bitmap_super_s
*)(((char*)super
)+1024);
1152 misc
= (struct misc_dev_info
*) (bsb
+1);
1153 misc
->device_size
= dsize
;
1155 /* Now check on the bitmap superblock */
1156 if ((__le32_to_cpu(super
->feature_map
)&MD_FEATURE_BITMAP_OFFSET
) == 0)
1158 /* Read the bitmap superblock and make sure it looks
1159 * valid. If it doesn't clear the bit. An --assemble --force
1160 * should get that written out.
1162 locate_bitmap1(st
, fd
);
1163 if (read(fd
, ((char*)super
)+1024, sizeof(struct bitmap_super_s
))
1164 != sizeof(struct bitmap_super_s
))
1167 uuid_from_super1(st
, uuid
);
1168 if (__le32_to_cpu(bsb
->magic
) != BITMAP_MAGIC
||
1169 memcmp(bsb
->uuid
, uuid
, 16) != 0)
1174 super
->feature_map
= __cpu_to_le32(__le32_to_cpu(super
->feature_map
) & ~1);
1179 static struct supertype
*match_metadata_desc1(char *arg
)
1181 struct supertype
*st
= malloc(sizeof(*st
));
1187 if (strcmp(arg
, "1.0") == 0) {
1188 st
->minor_version
= 0;
1191 if (strcmp(arg
, "1.1") == 0) {
1192 st
->minor_version
= 1;
1195 if (strcmp(arg
, "1.2") == 0) {
1196 st
->minor_version
= 2;
1199 if (strcmp(arg
, "1") == 0 ||
1200 strcmp(arg
, "default/large") == 0) {
1201 st
->minor_version
= -1;
1209 /* find available size on device with this devsize, using
1210 * superblock type st, and reserving 'reserve' sectors for
1213 static __u64
avail_size1(struct supertype
*st
, __u64 devsize
)
1215 struct mdp_superblock_1
*super
= st
->sb
;
1220 /* creating: allow suitable space for bitmap */
1221 devsize
-= choose_bm_space(devsize
);
1223 else if (__le32_to_cpu(super
->feature_map
)&MD_FEATURE_BITMAP_OFFSET
) {
1224 /* hot-add. allow for actual size of bitmap */
1225 struct bitmap_super_s
*bsb
;
1226 bsb
= (struct bitmap_super_s
*)(((char*)super
)+1024);
1227 devsize
-= bitmap_sectors(bsb
);
1231 switch(st
->minor_version
) {
1232 case -1: /* no specified. Now time to set default */
1233 st
->minor_version
= 0;
1237 return ((devsize
- 8*2 ) & ~(4*2-1));
1239 /* at start, 4K for superblock and possible bitmap */
1240 return devsize
- 4*2;
1242 /* 4k from start, 4K for superblock and possible bitmap */
1243 return devsize
- (4+4)*2;
1249 add_internal_bitmap1(struct supertype
*st
,
1250 int *chunkp
, int delay
, int write_behind
,
1251 unsigned long long size
,
1252 int may_change
, int major
)
1255 * If not may_change, then this is a 'Grow', and the bitmap
1256 * must fit after the superblock.
1257 * If may_change, then this is create, and we can put the bitmap
1258 * before the superblock if we like, or may move the start.
1259 * If !may_change, the bitmap MUST live at offset of 1K, until
1260 * we get a sysfs interface.
1262 * size is in sectors, chunk is in bytes !!!
1265 unsigned long long bits
;
1266 unsigned long long max_bits
;
1267 unsigned long long min_chunk
;
1269 int chunk
= *chunkp
;
1271 struct mdp_superblock_1
*sb
= st
->sb
;
1272 bitmap_super_t
*bms
= (bitmap_super_t
*)(((char*)sb
) + 1024);
1274 switch(st
->minor_version
) {
1276 /* either 3K after the superblock, or some amount of space
1280 /* We are creating array, so we *know* how much room has
1284 room
= choose_bm_space(__le64_to_cpu(sb
->size
));
1286 /* make it 3K after the superblock */
1291 room
= __le64_to_cpu(sb
->super_offset
)
1292 - __le64_to_cpu(sb
->data_offset
)
1293 - __le64_to_cpu(sb
->data_size
);
1294 /* remove '1 ||' when we can set offset via sysfs */
1295 if (1 || (room
< 3*2 &&
1296 __le32_to_cpu(sb
->max_dev
) <= 384)) {
1300 offset
= 0; /* means movable offset */
1305 case 2: /* between superblock and data */
1308 room
= choose_bm_space(__le64_to_cpu(sb
->size
));
1310 room
= __le64_to_cpu(sb
->data_offset
)
1311 - __le64_to_cpu(sb
->super_offset
);
1312 if (1 || __le32_to_cpu(sb
->max_dev
) <= 384) {
1325 if (chunk
== UnSet
&& room
> 128*2)
1326 /* Limit to 128K of bitmap when chunk size not requested */
1329 max_bits
= (room
* 512 - sizeof(bitmap_super_t
)) * 8;
1331 min_chunk
= 4096; /* sub-page chunks don't work yet.. */
1332 bits
= (size
*512)/min_chunk
+1;
1333 while (bits
> max_bits
) {
1339 else if (chunk
< min_chunk
)
1340 return 0; /* chunk size too small */
1341 if (chunk
== 0) /* rounding problem */
1345 bits
= (size
*512) / chunk
+ 1;
1346 room
= ((bits
+7)/8 + sizeof(bitmap_super_t
) +511)/512;
1350 sb
->bitmap_offset
= __cpu_to_le32(offset
);
1352 sb
->feature_map
= __cpu_to_le32(__le32_to_cpu(sb
->feature_map
) | 1);
1353 memset(bms
, 0, sizeof(*bms
));
1354 bms
->magic
= __cpu_to_le32(BITMAP_MAGIC
);
1355 bms
->version
= __cpu_to_le32(major
);
1356 uuid_from_super1(st
, (int*)bms
->uuid
);
1357 bms
->chunksize
= __cpu_to_le32(chunk
);
1358 bms
->daemon_sleep
= __cpu_to_le32(delay
);
1359 bms
->sync_size
= __cpu_to_le64(size
);
1360 bms
->write_behind
= __cpu_to_le32(write_behind
);
1367 static void locate_bitmap1(struct supertype
*st
, int fd
)
1369 unsigned long long offset
;
1370 struct mdp_superblock_1
*sb
;
1374 if (st
->ss
->load_super(st
, fd
, NULL
))
1375 return; /* no error I hope... */
1380 offset
= __le64_to_cpu(sb
->super_offset
);
1381 offset
+= (int32_t) __le32_to_cpu(sb
->bitmap_offset
);
1384 lseek64(fd
, offset
<<9, 0);
1387 static int write_bitmap1(struct supertype
*st
, int fd
)
1389 struct mdp_superblock_1
*sb
= st
->sb
;
1390 bitmap_super_t
*bms
= (bitmap_super_t
*)(((char*)sb
)+1024);
1396 locate_bitmap1(st
, fd
);
1398 if (write(fd
, ((char*)sb
)+1024, sizeof(bitmap_super_t
)) !=
1399 sizeof(bitmap_super_t
))
1401 towrite
= __le64_to_cpu(bms
->sync_size
) / (__le32_to_cpu(bms
->chunksize
)>>9);
1402 towrite
= (towrite
+7) >> 3; /* bits to bytes */
1403 memset(buf
, 0xff, sizeof(buf
));
1404 while (towrite
> 0) {
1406 if (n
> sizeof(buf
))
1408 n
= write(fd
, buf
, n
);
1421 static void free_super1(struct supertype
*st
)
1428 struct superswitch super1
= {
1430 .examine_super
= examine_super1
,
1431 .brief_examine_super
= brief_examine_super1
,
1432 .export_examine_super
= export_examine_super1
,
1433 .detail_super
= detail_super1
,
1434 .brief_detail_super
= brief_detail_super1
,
1435 .export_detail_super
= export_detail_super1
,
1437 .match_home
= match_home1
,
1438 .uuid_from_super
= uuid_from_super1
,
1439 .getinfo_super
= getinfo_super1
,
1440 .update_super
= update_super1
,
1441 .init_super
= init_super1
,
1442 .add_to_super
= add_to_super1
,
1443 .store_super
= store_super1
,
1444 .write_init_super
= write_init_super1
,
1445 .compare_super
= compare_super1
,
1446 .load_super
= load_super1
,
1447 .match_metadata_desc
= match_metadata_desc1
,
1448 .avail_size
= avail_size1
,
1449 .add_internal_bitmap
= add_internal_bitmap1
,
1450 .locate_bitmap
= locate_bitmap1
,
1451 .write_bitmap
= write_bitmap1
,
1452 .free_super
= free_super1
,
1454 #if __BYTE_ORDER == BIG_ENDIAN