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) ((int)&(((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
++);
131 newcsum
+= __le16_to_cpu(*(unsigned short*) isuper
);
133 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
134 sb
->sb_csum
= disk_csum
;
139 static void examine_super1(void *sbv
, char *homehost
)
141 struct mdp_superblock_1
*sb
= sbv
;
147 int l
= homehost
? strlen(homehost
) : 0;
149 printf(" Magic : %08x\n", __le32_to_cpu(sb
->magic
));
150 printf(" Version : %02d\n", 1);
151 printf(" Feature Map : 0x%x\n", __le32_to_cpu(sb
->feature_map
));
152 printf(" Array UUID : ");
153 for (i
=0; i
<16; i
++) {
154 if ((i
&3)==0 && i
!= 0) printf(":");
155 printf("%02x", sb
->set_uuid
[i
]);
158 printf(" Name : %.32s", sb
->set_name
);
159 if (l
> 0 && l
< 32 &&
160 sb
->set_name
[l
] == ':' &&
161 strncmp(sb
->set_name
, homehost
, l
) == 0)
162 printf(" (local to host %s)", homehost
);
164 atime
= __le64_to_cpu(sb
->ctime
) & 0xFFFFFFFFFFULL
;
165 printf(" Creation Time : %.24s\n", ctime(&atime
));
166 c
=map_num(pers
, __le32_to_cpu(sb
->level
));
167 printf(" Raid Level : %s\n", c
?c
:"-unknown-");
168 printf(" Raid Devices : %d\n", __le32_to_cpu(sb
->raid_disks
));
170 printf(" Device Size : %llu%s\n", (unsigned long long)sb
->data_size
, human_size(sb
->data_size
<<9));
171 if (__le32_to_cpu(sb
->level
) >= 0) {
173 switch(__le32_to_cpu(sb
->level
)) {
174 case 1: ddsks
=1;break;
176 case 5: ddsks
= sb
->raid_disks
-1; break;
177 case 6: ddsks
= sb
->raid_disks
-2; break;
178 case 10: ddsks
= sb
->raid_disks
/ (sb
->layout
&255) / ((sb
->layout
>>8)&255);
181 printf(" Array Size : %llu%s\n", ddsks
*(unsigned long long)sb
->size
, human_size(ddsks
*sb
->size
<<9));
182 if (sb
->size
!= sb
->data_size
)
183 printf(" Used Size : %llu%s\n", (unsigned long long)sb
->size
, human_size(sb
->size
<<9));
186 printf(" Data Offset : %llu sectors\n", (unsigned long long)__le64_to_cpu(sb
->data_offset
));
187 if (sb
->super_offset
)
188 printf(" Super Offset : %llu sectors\n", (unsigned long long)__le64_to_cpu(sb
->super_offset
));
189 if (__le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RECOVERY_OFFSET
)
190 printf("Recovery Offset : %llu sectors\n", (unsigned long long)__le64_to_cpu(sb
->recovery_offset
));
191 printf(" State : %s\n", (__le64_to_cpu(sb
->resync_offset
)+1)? "active":"clean");
192 printf(" Device UUID : ");
193 for (i
=0; i
<16; i
++) {
194 if ((i
&3)==0 && i
!= 0) printf(":");
195 printf("%02x", sb
->device_uuid
[i
]);
199 if (sb
->feature_map
& __cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
)) {
200 printf("Internal Bitmap : %ld sectors from superblock\n",
201 (long)__le32_to_cpu(sb
->bitmap_offset
));
203 if (sb
->feature_map
& __le32_to_cpu(MD_FEATURE_RESHAPE_ACTIVE
)) {
204 printf(" Reshape pos'n : %llu%s\n", (unsigned long long)__le64_to_cpu(sb
->reshape_position
)/2,
205 human_size(__le64_to_cpu(sb
->reshape_position
)<<9));
206 if (__le32_to_cpu(sb
->delta_disks
)) {
207 printf(" Delta Devices : %d", __le32_to_cpu(sb
->delta_disks
));
208 if (__le32_to_cpu(sb
->delta_disks
))
209 printf(" (%d->%d)\n",
210 __le32_to_cpu(sb
->raid_disks
)-__le32_to_cpu(sb
->delta_disks
),
211 __le32_to_cpu(sb
->raid_disks
));
213 printf(" (%d->%d)\n", __le32_to_cpu(sb
->raid_disks
),
214 __le32_to_cpu(sb
->raid_disks
)+__le32_to_cpu(sb
->delta_disks
));
216 if (__le32_to_cpu(sb
->new_level
) != __le32_to_cpu(sb
->level
)) {
217 c
= map_num(pers
, __le32_to_cpu(sb
->new_level
));
218 printf(" New Level : %s\n", c
?c
:"-unknown-");
220 if (__le32_to_cpu(sb
->new_layout
) != __le32_to_cpu(sb
->layout
)) {
221 if (__le32_to_cpu(sb
->level
) == 5) {
222 c
= map_num(r5layout
, __le32_to_cpu(sb
->new_layout
));
223 printf(" New Layout : %s\n", c
?c
:"-unknown-");
225 if (__le32_to_cpu(sb
->level
) == 10) {
226 printf(" New Layout : near=%d, %s=%d\n",
227 __le32_to_cpu(sb
->new_layout
)&255,
228 (__le32_to_cpu(sb
->new_layout
)&0x10000)?"offset":"far",
229 (__le32_to_cpu(sb
->new_layout
)>>8)&255);
232 if (__le32_to_cpu(sb
->new_chunk
) != __le32_to_cpu(sb
->chunksize
))
233 printf(" New Chunksize : %dK\n", __le32_to_cpu(sb
->new_chunk
)/2);
238 if (sb
->devflags
& WriteMostly1
)
239 printf(" write-mostly");
243 atime
= __le64_to_cpu(sb
->utime
) & 0xFFFFFFFFFFULL
;
244 printf(" Update Time : %.24s\n", ctime(&atime
));
246 if (calc_sb_1_csum(sb
) == sb
->sb_csum
)
247 printf(" Checksum : %x - correct\n", __le32_to_cpu(sb
->sb_csum
));
249 printf(" Checksum : %x - expected %x\n", __le32_to_cpu(sb
->sb_csum
),
250 __le32_to_cpu(calc_sb_1_csum(sb
)));
251 printf(" Events : %llu\n", (unsigned long long)__le64_to_cpu(sb
->events
));
253 if (__le32_to_cpu(sb
->level
) == 5) {
254 c
= map_num(r5layout
, __le32_to_cpu(sb
->layout
));
255 printf(" Layout : %s\n", c
?c
:"-unknown-");
257 if (__le32_to_cpu(sb
->level
) == 10) {
258 int lo
= __le32_to_cpu(sb
->layout
);
259 printf(" Layout : near=%d, %s=%d\n",
261 (lo
&0x10000)?"offset":"far",
264 switch(__le32_to_cpu(sb
->level
)) {
270 printf(" Chunk Size : %dK\n", __le32_to_cpu(sb
->chunksize
)/2);
273 printf(" Rounding : %dK\n", __le32_to_cpu(sb
->chunksize
)/2);
278 printf(" Array State : ");
279 for (d
=0; d
<__le32_to_cpu(sb
->raid_disks
); d
++) {
283 for (i
=0; i
< __le32_to_cpu(sb
->max_dev
); i
++) {
284 int role
= __le16_to_cpu(sb
->dev_roles
[i
]);
286 if (i
== __le32_to_cpu(sb
->dev_number
))
291 if (cnt
> 1) printf("?");
292 else if (cnt
== 1 && me
) printf("U");
293 else if (cnt
== 1) printf("u");
297 for (i
=0; i
< __le32_to_cpu(sb
->max_dev
); i
++) {
298 int role
= __le16_to_cpu(sb
->dev_roles
[i
]);
302 if (faulty
) printf(" %d failed", faulty
);
307 static void brief_examine_super1(void *sbv
)
309 struct mdp_superblock_1
*sb
= sbv
;
312 char *c
=map_num(pers
, __le32_to_cpu(sb
->level
));
314 printf("ARRAY /dev/?? level=%s metadata=1 num-devices=%d UUID=",
315 c
?c
:"-unknown-", sb
->raid_disks
);
316 for (i
=0; i
<16; i
++) {
317 printf("%02x", sb
->set_uuid
[i
]);
318 if ((i
&3)==0 && i
!= 0) printf(":");
321 printf(" name=%.32s", sb
->set_name
);
325 static void detail_super1(void *sbv
, char *homehost
)
327 struct mdp_superblock_1
*sb
= sbv
;
329 int l
= homehost
? strlen(homehost
) : 0;
331 printf(" Name : %.32s", sb
->set_name
);
332 if (l
> 0 && l
< 32 &&
333 sb
->set_name
[l
] == ':' &&
334 strncmp(sb
->set_name
, homehost
, l
) == 0)
335 printf(" (local to host %s)", homehost
);
336 printf("\n UUID : ");
337 for (i
=0; i
<16; i
++) {
338 if ((i
&3)==0 && i
!= 0) printf(":");
339 printf("%02x", sb
->set_uuid
[i
]);
341 printf("\n Events : %llu\n\n", (unsigned long long)__le64_to_cpu(sb
->events
));
344 static void brief_detail_super1(void *sbv
)
346 struct mdp_superblock_1
*sb
= sbv
;
350 printf(" name=%.32s", sb
->set_name
);
352 for (i
=0; i
<16; i
++) {
353 if ((i
&3)==0 && i
!= 0) printf(":");
354 printf("%02x", sb
->set_uuid
[i
]);
360 static void uuid_from_super1(int uuid
[4], void * sbv
)
362 struct mdp_superblock_1
*super
= sbv
;
363 char *cuuid
= (char*)uuid
;
366 cuuid
[i
] = super
->set_uuid
[i
];
369 static void getinfo_super1(struct mdinfo
*info
, void *sbv
)
371 struct mdp_superblock_1
*sb
= sbv
;
376 info
->array
.major_version
= 1;
377 info
->array
.minor_version
= __le32_to_cpu(sb
->feature_map
);
378 info
->array
.patch_version
= 0;
379 info
->array
.raid_disks
= __le32_to_cpu(sb
->raid_disks
);
380 info
->array
.level
= __le32_to_cpu(sb
->level
);
381 info
->array
.layout
= __le32_to_cpu(sb
->layout
);
382 info
->array
.md_minor
= -1;
383 info
->array
.ctime
= __le64_to_cpu(sb
->ctime
);
384 info
->array
.utime
= __le64_to_cpu(sb
->utime
);
385 info
->array
.chunk_size
= __le32_to_cpu(sb
->chunksize
)*512;
387 info
->data_offset
= __le64_to_cpu(sb
->data_offset
);
388 info
->component_size
= __le64_to_cpu(sb
->size
);
390 info
->disk
.major
= 0;
391 info
->disk
.minor
= 0;
392 info
->disk
.number
= __le32_to_cpu(sb
->dev_number
);
393 if (__le32_to_cpu(sb
->dev_number
) >= __le32_to_cpu(sb
->max_dev
) ||
394 __le32_to_cpu(sb
->max_dev
) > 512)
397 role
= __le16_to_cpu(sb
->dev_roles
[__le32_to_cpu(sb
->dev_number
)]);
399 info
->disk
.raid_disk
= -1;
402 info
->disk
.state
= 2; /* spare: ACTIVE, not sync, not faulty */
405 info
->disk
.state
= 1; /* faulty */
408 info
->disk
.state
= 6; /* active and in sync */
409 info
->disk
.raid_disk
= role
;
411 info
->events
= __le64_to_cpu(sb
->events
);
413 memcpy(info
->uuid
, sb
->set_uuid
, 16);
415 strncpy(info
->name
, sb
->set_name
, 32);
418 if (sb
->feature_map
& __le32_to_cpu(MD_FEATURE_RESHAPE_ACTIVE
)) {
419 info
->reshape_active
= 1;
420 info
->reshape_progress
= __le64_to_cpu(sb
->reshape_position
);
421 info
->new_level
= __le32_to_cpu(sb
->new_level
);
422 info
->delta_disks
= __le32_to_cpu(sb
->delta_disks
);
423 info
->new_layout
= __le32_to_cpu(sb
->new_layout
);
424 info
->new_chunk
= __le32_to_cpu(sb
->new_chunk
)<<9;
426 info
->reshape_active
= 0;
428 for (i
=0; i
< __le32_to_cpu(sb
->max_dev
); i
++) {
429 role
= __le16_to_cpu(sb
->dev_roles
[i
]);
430 if (/*role == 0xFFFF || */role
< info
->array
.raid_disks
)
434 info
->array
.working_disks
= working
;
437 static int update_super1(struct mdinfo
*info
, void *sbv
, char *update
,
438 char *devname
, int verbose
,
439 int uuid_set
, char *homehost
)
441 /* NOTE: for 'assemble' and 'force' we need to return non-zero if any change was made.
442 * For others, the return value is ignored.
445 struct mdp_superblock_1
*sb
= sbv
;
447 if (strcmp(update
, "force")==0) {
448 if (sb
->events
!= __cpu_to_le64(info
->events
))
450 sb
->events
= __cpu_to_le64(info
->events
);
451 switch(__le32_to_cpu(sb
->level
)) {
452 case 5: case 4: case 6:
453 /* need to force clean */
454 if (sb
->resync_offset
!= ~0ULL)
456 sb
->resync_offset
= ~0ULL;
459 if (strcmp(update
, "assemble")==0) {
460 int d
= info
->disk
.number
;
462 if (info
->disk
.state
== 6)
463 want
= __cpu_to_le32(info
->disk
.raid_disk
);
466 if (sb
->dev_roles
[d
] != want
) {
467 sb
->dev_roles
[d
] = want
;
472 if (strcmp(update
, "newdev") == 0) {
473 int d
= info
->disk
.number
;
474 memset(&sb
->disks
[d
], 0, sizeof(sb
->disks
[d
]));
475 sb
->disks
[d
].number
= d
;
476 sb
->disks
[d
].major
= info
->disk
.major
;
477 sb
->disks
[d
].minor
= info
->disk
.minor
;
478 sb
->disks
[d
].raid_disk
= info
->disk
.raid_disk
;
479 sb
->disks
[d
].state
= info
->disk
.state
;
480 sb
->this_disk
= sb
->disks
[d
];
483 if (strcmp(update
, "grow") == 0) {
484 sb
->raid_disks
= __cpu_to_le32(info
->array
.raid_disks
);
487 if (strcmp(update
, "resync") == 0) {
488 /* make sure resync happens */
489 sb
->resync_offset
= ~0ULL;
491 if (strcmp(update
, "uuid") == 0) {
492 memcpy(sb
->set_uuid
, info
->uuid
, 16);
493 if (__le32_to_cpu(sb
->feature_map
)&MD_FEATURE_BITMAP_OFFSET
) {
494 struct bitmap_super_s
*bm
;
495 bm
= (struct bitmap_super_s
*)(sbv
+1024);
496 memcpy(bm
->uuid
, info
->uuid
, 16);
499 if (strcmp(update
, "_reshape_progress")==0)
500 sb
->reshape_position
= __cpu_to_le64(info
->reshape_progress
);
502 sb
->sb_csum
= calc_sb_1_csum(sb
);
507 static __u64
event_super1(void *sbv
)
509 struct mdp_superblock_1
*sb
= sbv
;
510 return __le64_to_cpu(sb
->events
);
513 static int init_super1(struct supertype
*st
, void **sbp
, mdu_array_info_t
*info
,
514 unsigned long long size
, char *name
, char *homehost
)
516 struct mdp_superblock_1
*sb
= malloc(1024 + sizeof(bitmap_super_t
));
522 if (info
->major_version
== -1) {
523 /* zeroing superblock */
528 spares
= info
->working_disks
- info
->active_disks
;
529 if (info
->raid_disks
+ spares
> 384) {
530 fprintf(stderr
, Name
": too many devices requested: %d+%d > %d\n",
531 info
->raid_disks
, spares
, 384);
535 sb
->magic
= __cpu_to_le32(MD_SB_MAGIC
);
536 sb
->major_version
= __cpu_to_le32(1);
540 if ((rfd
= open("/dev/urandom", O_RDONLY
)) < 0 ||
541 read(rfd
, sb
->set_uuid
, 16) != 16) {
542 *(__u32
*)(sb
->set_uuid
) = random();
543 *(__u32
*)(sb
->set_uuid
+4) = random();
544 *(__u32
*)(sb
->set_uuid
+8) = random();
545 *(__u32
*)(sb
->set_uuid
+12) = random();
547 if (rfd
>= 0) close(rfd
);
549 if (name
== NULL
|| *name
== 0) {
550 sprintf(defname
, "%d", info
->md_minor
);
553 memset(sb
->set_name
, 0, 32);
555 strchr(name
, ':')== NULL
&&
556 strlen(homehost
)+1+strlen(name
) < 32) {
557 strcpy(sb
->set_name
, homehost
);
558 strcat(sb
->set_name
, ":");
559 strcat(sb
->set_name
, name
);
561 strcpy(sb
->set_name
, name
);
563 sb
->ctime
= __cpu_to_le64((unsigned long long)time(0));
564 sb
->level
= __cpu_to_le32(info
->level
);
565 sb
->layout
= __cpu_to_le32(info
->layout
);
566 sb
->size
= __cpu_to_le64(size
*2ULL);
567 sb
->chunksize
= __cpu_to_le32(info
->chunk_size
>>9);
568 sb
->raid_disks
= __cpu_to_le32(info
->raid_disks
);
570 sb
->data_offset
= __cpu_to_le64(0);
571 sb
->data_size
= __cpu_to_le64(0);
572 sb
->super_offset
= __cpu_to_le64(0);
573 sb
->recovery_offset
= __cpu_to_le64(0);
575 sb
->utime
= sb
->ctime
;
576 sb
->events
= __cpu_to_le64(1);
577 if (info
->state
& (1<<MD_SB_CLEAN
))
578 sb
->resync_offset
= ~0ULL;
580 sb
->resync_offset
= 0;
581 sb
->max_dev
= __cpu_to_le32((1024- sizeof(struct mdp_superblock_1
))/
582 sizeof(sb
->dev_roles
[0]));
583 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
585 memset(sb
->dev_roles
, 0xff, 1024 - sizeof(struct mdp_superblock_1
));
591 /* Add a device to the superblock being created */
592 static void add_to_super1(void *sbv
, mdu_disk_info_t
*dk
)
594 struct mdp_superblock_1
*sb
= sbv
;
595 __u16
*rp
= sb
->dev_roles
+ dk
->number
;
596 if ((dk
->state
& 6) == 6) /* active, sync */
597 *rp
= __cpu_to_le16(dk
->raid_disk
);
598 else if ((dk
->state
& ~2) == 0) /* active or idle -> spare */
604 static void locate_bitmap1(struct supertype
*st
, int fd
, void *sbv
);
606 static int store_super1(struct supertype
*st
, int fd
, void *sbv
)
608 struct mdp_superblock_1
*sb
= sbv
;
609 unsigned long long sb_offset
;
612 unsigned long long dsize
;
615 if (ioctl(fd
, BLKGETSIZE64
, &dsize
) != 0)
618 if (ioctl(fd
, BLKGETSIZE
, &size
))
621 dsize
= (unsigned long long)size
;
629 * Calculate the position of the superblock.
630 * It is always aligned to a 4K boundary and
631 * depending on minor_version, it can be:
632 * 0: At least 8K, but less than 12K, from end of device
633 * 1: At start of device
634 * 2: 4K from start of device.
636 switch(st
->minor_version
) {
640 sb_offset
&= ~(4*2-1);
654 if (sb_offset
!= __le64_to_cpu(sb
->super_offset
) &&
655 0 != __le64_to_cpu(sb
->super_offset
)
657 fprintf(stderr
, Name
": internal error - sb_offset is wrong\n");
661 if (lseek64(fd
, sb_offset
<< 9, 0)< 0LL)
664 sbsize
= sizeof(*sb
) + 2 * __le32_to_cpu(sb
->max_dev
);
666 if (write(fd
, sb
, sbsize
) != sbsize
)
669 if (sb
->feature_map
& __cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
)) {
670 struct bitmap_super_s
*bm
= (struct bitmap_super_s
*)
672 if (__le32_to_cpu(bm
->magic
) == BITMAP_MAGIC
) {
673 locate_bitmap1(st
, fd
, sbv
);
674 write(fd
, bm
, sizeof(*bm
));
681 static int load_super1(struct supertype
*st
, int fd
, void **sbp
, char *devname
);
683 static int write_init_super1(struct supertype
*st
, void *sbv
,
684 mdu_disk_info_t
*dinfo
, char *devname
)
686 struct mdp_superblock_1
*sb
= sbv
;
688 int fd
= open(devname
, O_RDWR
| O_EXCL
);
692 unsigned long size
, space
;
693 unsigned long long dsize
, array_size
;
698 fprintf(stderr
, Name
": Failed to open %s to write superblock\n",
703 sb
->dev_number
= __cpu_to_le32(dinfo
->number
);
704 if (dinfo
->state
& (1<<MD_DISK_WRITEMOSTLY
))
705 sb
->devflags
|= WriteMostly1
;
707 if ((rfd
= open("/dev/urandom", O_RDONLY
)) < 0 ||
708 read(rfd
, sb
->device_uuid
, 16) != 16) {
709 *(__u32
*)(sb
->device_uuid
) = random();
710 *(__u32
*)(sb
->device_uuid
+4) = random();
711 *(__u32
*)(sb
->device_uuid
+8) = random();
712 *(__u32
*)(sb
->device_uuid
+12) = random();
714 if (rfd
>= 0) close(rfd
);
717 if (load_super1(st
, fd
, &refsbv
, NULL
)==0) {
718 struct mdp_superblock_1
*refsb
= refsbv
;
720 memcpy(sb
->device_uuid
, refsb
->device_uuid
, 16);
721 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16)==0) {
722 /* same array, so preserve events and dev_number */
723 sb
->events
= refsb
->events
;
724 sb
->dev_number
= refsb
->dev_number
;
730 if (ioctl(fd
, BLKGETSIZE64
, &dsize
) != 0)
733 if (ioctl(fd
, BLKGETSIZE
, &size
))
747 * Calculate the position of the superblock.
748 * It is always aligned to a 4K boundary and
749 * depending on minor_version, it can be:
750 * 0: At least 8K, but less than 12K, from end of device
751 * 1: At start of device
752 * 2: 4K from start of device.
753 * Depending on the array size, we might leave extra space
756 array_size
= __le64_to_cpu(sb
->size
);
757 switch(st
->minor_version
) {
761 sb_offset
&= ~(4*2-1);
762 sb
->super_offset
= __cpu_to_le64(sb_offset
);
763 sb
->data_offset
= __cpu_to_le64(0);
764 if (sb_offset
-64*2 >= array_size
&& array_size
> 8*1024*1024*2)
765 sb
->data_size
= __cpu_to_le64(sb_offset
-64*2);
767 sb
->data_size
= __cpu_to_le64(sb_offset
);
770 sb
->super_offset
= __cpu_to_le64(0);
771 if (dsize
- 64*2 >= array_size
&& array_size
> 8*1024*1024*2)
775 sb
->data_offset
= __cpu_to_le64(space
); /* leave space for super and bitmap */
776 sb
->data_size
= __cpu_to_le64(dsize
- space
);
780 if (dsize
- 4*2 - 64*2 >= array_size
&& array_size
> 8*1024*1024*2)
784 sb
->super_offset
= __cpu_to_le64(sb_offset
);
785 sb
->data_offset
= __cpu_to_le64(sb_offset
+space
);
786 sb
->data_size
= __cpu_to_le64(dsize
- 4*2 - space
);
793 sb
->sb_csum
= calc_sb_1_csum(sb
);
794 rv
= store_super1(st
, fd
, sb
);
796 fprintf(stderr
, Name
": failed to write superblock to %s\n", devname
);
798 if (rv
== 0 && (__le32_to_cpu(sb
->feature_map
) & 1))
799 rv
= st
->ss
->write_bitmap(st
, fd
, sbv
);
804 static int compare_super1(void **firstp
, void *secondv
)
808 * 0 same, or first was empty, and second was copied
809 * 1 second had wrong number
813 struct mdp_superblock_1
*first
= *firstp
;
814 struct mdp_superblock_1
*second
= secondv
;
816 if (second
->magic
!= __cpu_to_le32(MD_SB_MAGIC
))
818 if (second
->major_version
!= __cpu_to_le32(1))
822 first
= malloc(1024+sizeof(bitmap_super_t
));
823 memcpy(first
, second
, 1024+sizeof(bitmap_super_t
));
827 if (memcmp(first
->set_uuid
, second
->set_uuid
, 16)!= 0)
830 if (first
->ctime
!= second
->ctime
||
831 first
->level
!= second
->level
||
832 first
->layout
!= second
->layout
||
833 first
->size
!= second
->size
||
834 first
->chunksize
!= second
->chunksize
||
835 first
->raid_disks
!= second
->raid_disks
)
840 static int load_super1(struct supertype
*st
, int fd
, void **sbp
, char *devname
)
843 unsigned long long dsize
;
844 unsigned long long sb_offset
;
845 struct mdp_superblock_1
*super
;
847 struct bitmap_super_s
*bsb
;
850 if (st
->ss
== NULL
) {
853 /* guess... choose latest ctime */
855 for (st
->minor_version
= 0; st
->minor_version
<= 2 ; st
->minor_version
++) {
856 switch(load_super1(st
, fd
, sbp
, devname
)) {
857 case 0: super
= *sbp
;
858 if (bestvers
== -1 ||
859 bestctime
< __le64_to_cpu(super
->ctime
)) {
860 bestvers
= st
->minor_version
;
861 bestctime
= __le64_to_cpu(super
->ctime
);
866 case 1: st
->ss
= NULL
; return 1; /*bad device */
867 case 2: break; /* bad, try next */
870 if (bestvers
!= -1) {
872 st
->minor_version
= bestvers
;
875 rv
= load_super1(st
, fd
, sbp
, devname
);
876 if (rv
) st
->ss
= NULL
;
883 if (ioctl(fd
, BLKGETSIZE64
, &dsize
) != 0)
886 if (ioctl(fd
, BLKGETSIZE
, &size
)) {
888 fprintf(stderr
, Name
": cannot find device size for %s: %s\n",
889 devname
, strerror(errno
));
898 fprintf(stderr
, Name
": %s is too small for md: size is %llu sectors.\n",
904 * Calculate the position of the superblock.
905 * It is always aligned to a 4K boundary and
906 * depending on minor_version, it can be:
907 * 0: At least 8K, but less than 12K, from end of device
908 * 1: At start of device
909 * 2: 4K from start of device.
911 switch(st
->minor_version
) {
915 sb_offset
&= ~(4*2-1);
927 ioctl(fd
, BLKFLSBUF
, 0); /* make sure we read current data */
930 if (lseek64(fd
, sb_offset
<< 9, 0)< 0LL) {
932 fprintf(stderr
, Name
": Cannot seek to superblock on %s: %s\n",
933 devname
, strerror(errno
));
937 super
= malloc(1024 + sizeof(bitmap_super_t
));
939 if (read(fd
, super
, 1024) != 1024) {
941 fprintf(stderr
, Name
": Cannot read superblock on %s\n",
947 if (__le32_to_cpu(super
->magic
) != MD_SB_MAGIC
) {
949 fprintf(stderr
, Name
": No super block found on %s (Expected magic %08x, got %08x)\n",
950 devname
, MD_SB_MAGIC
, __le32_to_cpu(super
->magic
));
955 if (__le32_to_cpu(super
->major_version
) != 1) {
957 fprintf(stderr
, Name
": Cannot interpret superblock on %s - version is %d\n",
958 devname
, __le32_to_cpu(super
->major_version
));
962 if (__le64_to_cpu(super
->super_offset
) != sb_offset
) {
964 fprintf(stderr
, Name
": No superblock found on %s (super_offset is wrong)\n",
971 /* Now check on the bitmap superblock */
972 if ((__le32_to_cpu(super
->feature_map
)&MD_FEATURE_BITMAP_OFFSET
) == 0)
974 /* Read the bitmap superblock and make sure it looks
975 * valid. If it doesn't clear the bit. An --assemble --force
976 * should get that written out.
978 locate_bitmap1(st
, fd
, super
);
979 if (read(fd
, ((char*)super
)+1024, sizeof(struct bitmap_super_s
))
980 != sizeof(struct bitmap_super_s
))
983 uuid_from_super1(uuid
, super
);
984 bsb
= (struct bitmap_super_s
*)(((char*)super
)+1024);
985 if (__le32_to_cpu(bsb
->magic
) != BITMAP_MAGIC
||
986 memcmp(bsb
->uuid
, uuid
, 16) != 0)
991 super
->feature_map
= __cpu_to_le32(__le32_to_cpu(super
->feature_map
) & ~1);
996 static struct supertype
*match_metadata_desc1(char *arg
)
998 struct supertype
*st
= malloc(sizeof(*st
));
1003 if (strcmp(arg
, "1") == 0 ||
1004 strcmp(arg
, "1.0") == 0 ||
1005 strcmp(arg
, "default/large") == 0) {
1006 st
->minor_version
= 0;
1009 if (strcmp(arg
, "1.1") == 0) {
1010 st
->minor_version
= 1;
1013 if (strcmp(arg
, "1.2") == 0) {
1014 st
->minor_version
= 2;
1022 /* find available size on device with this devsize, using
1023 * superblock type st, and reserving 'reserve' sectors for
1026 static __u64
avail_size1(struct supertype
*st
, __u64 devsize
)
1031 /* if the device is bigger than 8Gig, save 64k for bitmap usage,
1032 * if biffer than 200Gig, save 128k
1034 if (devsize
> 200*1024*1024*2)
1036 else if (devsize
> 8*1024*1024*2)
1039 switch(st
->minor_version
) {
1042 return ((devsize
- 8*2 ) & ~(4*2-1));
1044 /* at start, 4K for superblock and possible bitmap */
1045 return devsize
- 4*2;
1047 /* 4k from start, 4K for superblock and possible bitmap */
1048 return devsize
- (4+4)*2;
1054 add_internal_bitmap1(struct supertype
*st
, void *sbv
,
1055 int chunk
, int delay
, int write_behind
, unsigned long long size
,
1056 int may_change
, int major
)
1059 * If not may_change, then this is a 'Grow', and the bitmap
1060 * must fit after the superblock.
1061 * If may_change, then this is create, and we can put the bitmap
1062 * before the superblock if we like, or may move the start.
1063 * For now, just squeeze the bitmap into 3k and don't change anything.
1065 * size is in sectors, chunk is in bytes !!!
1068 unsigned long long bits
;
1069 unsigned long long max_bits
= (3*512 - sizeof(bitmap_super_t
)) * 8;
1070 unsigned long long min_chunk
;
1071 struct mdp_superblock_1
*sb
= sbv
;
1072 bitmap_super_t
*bms
= (bitmap_super_t
*)(((char*)sb
) + 1024);
1074 if (st
->minor_version
&& !may_change
&&
1075 __le64_to_cpu(sb
->data_offset
) - __le64_to_cpu(sb
->super_offset
) < 8)
1076 return 0; /* doesn't fit */
1080 min_chunk
= 4096; /* sub-page chunks don't work yet.. */
1081 bits
= (size
*512)/min_chunk
+1;
1082 while (bits
> max_bits
) {
1088 else if (chunk
< min_chunk
)
1089 return 0; /* chunk size too small */
1090 if (chunk
== 0) /* rounding problem */
1093 sb
->bitmap_offset
= __cpu_to_le32(2);
1095 sb
->feature_map
= __cpu_to_le32(__le32_to_cpu(sb
->feature_map
) | 1);
1096 memset(bms
, 0, sizeof(*bms
));
1097 bms
->magic
= __cpu_to_le32(BITMAP_MAGIC
);
1098 bms
->version
= __cpu_to_le32(major
);
1099 uuid_from_super1((int*)bms
->uuid
, sb
);
1100 bms
->chunksize
= __cpu_to_le32(chunk
);
1101 bms
->daemon_sleep
= __cpu_to_le32(delay
);
1102 bms
->sync_size
= __cpu_to_le64(size
);
1103 bms
->write_behind
= __cpu_to_le32(write_behind
);
1109 static void locate_bitmap1(struct supertype
*st
, int fd
, void *sbv
)
1111 unsigned long long offset
;
1112 struct mdp_superblock_1
*sb
;
1116 if (st
->ss
->load_super(st
, fd
, &sbv
, NULL
))
1117 return; /* no error I hope... */
1122 offset
= __le64_to_cpu(sb
->super_offset
);
1123 offset
+= (long) __le32_to_cpu(sb
->bitmap_offset
);
1126 lseek64(fd
, offset
<<9, 0);
1129 static int write_bitmap1(struct supertype
*st
, int fd
, void *sbv
)
1131 struct mdp_superblock_1
*sb
= sbv
;
1132 bitmap_super_t
*bms
= (bitmap_super_t
*)(((char*)sb
)+1024);
1138 locate_bitmap1(st
, fd
, sbv
);
1140 if (write(fd
, ((char*)sb
)+1024, sizeof(bitmap_super_t
)) !=
1141 sizeof(bitmap_super_t
))
1143 towrite
= __le64_to_cpu(bms
->sync_size
) / (__le32_to_cpu(bms
->chunksize
)>>9);
1144 towrite
= (towrite
+7) >> 3; /* bits to bytes */
1145 memset(buf
, 0xff, sizeof(buf
));
1146 while (towrite
> 0) {
1148 if (n
> sizeof(buf
))
1150 n
= write(fd
, buf
, n
);
1163 struct superswitch super1
= {
1165 .examine_super
= examine_super1
,
1166 .brief_examine_super
= brief_examine_super1
,
1167 .detail_super
= detail_super1
,
1168 .brief_detail_super
= brief_detail_super1
,
1170 .uuid_from_super
= uuid_from_super1
,
1171 .getinfo_super
= getinfo_super1
,
1172 .update_super
= update_super1
,
1173 .event_super
= event_super1
,
1174 .init_super
= init_super1
,
1175 .add_to_super
= add_to_super1
,
1176 .store_super
= store_super1
,
1177 .write_init_super
= write_init_super1
,
1178 .compare_super
= compare_super1
,
1179 .load_super
= load_super1
,
1180 .match_metadata_desc
= match_metadata_desc1
,
1181 .avail_size
= avail_size1
,
1182 .add_internal_bitmap
= add_internal_bitmap1
,
1183 .locate_bitmap
= locate_bitmap1
,
1184 .write_bitmap
= write_bitmap1
,
1186 #if __BYTE_ORDER == BIG_ENDIAN