2 * mdadm - manage Linux "md" devices aka RAID arrays.
4 * Copyright (C) 2001-2004 Neil Brown <neilb@cse.unsw.edu.au>
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 #include "asm/byteorder.h"
34 * The version-1 superblock :
35 * All numeric fields are little-endian.
37 * total size: 256 bytes plus 2 per device.
38 * 1K allows 384 devices.
40 struct mdp_superblock_1
{
41 /* constant array information - 128 bytes */
42 __u32 magic
; /* MD_SB_MAGIC: 0xa92b4efc - little endian */
43 __u32 major_version
; /* 1 */
44 __u32 feature_map
; /* 0 for now */
45 __u32 pad0
; /* always set to 0 when writing */
47 __u8 set_uuid
[16]; /* user-space generated. */
48 char set_name
[32]; /* set and interpreted by user-space */
50 __u64 ctime
; /* lo 40 bits are seconds, top 24 are microseconds or 0*/
51 __u32 level
; /* -4 (multipath), -1 (linear), 0,1,4,5 */
52 __u32 layout
; /* only for raid5 currently */
53 __u64 size
; /* used size of component devices, in 512byte sectors */
55 __u32 chunksize
; /* in 512byte sectors */
57 __u32 bitmap_offset
; /* sectors after start of superblock that bitmap starts
58 * NOTE: signed, so bitmap can be before superblock
59 * only meaningful of feature_map[0] is set.
61 __u8 pad1
[128-100]; /* set to 0 when written */
63 /* constant this-device information - 64 bytes */
64 __u64 data_offset
; /* sector start of data, often 0 */
65 __u64 data_size
; /* sectors in this device that can be used for data */
66 __u64 super_offset
; /* sector start of this superblock */
67 __u64 recovery_offset
;/* sectors before this offset (from data_offset) have been recovered */
68 __u32 dev_number
; /* permanent identifier of this device - not role in raid */
69 __u32 cnt_corrected_read
; /* number of read errors that were corrected by re-writing */
70 __u8 device_uuid
[16]; /* user-space setable, ignored by kernel */
71 __u8 devflags
; /* per-device flags. Only one defined...*/
72 #define WriteMostly1 1 /* mask for writemostly flag in above */
73 __u8 pad2
[64-57]; /* set to 0 when writing */
75 /* array state information - 64 bytes */
76 __u64 utime
; /* 40 bits second, 24 btes microseconds */
77 __u64 events
; /* incremented when superblock updated */
78 __u64 resync_offset
; /* data before this offset (from data_offset) known to be in sync */
79 __u32 sb_csum
; /* checksum upto devs[max_dev] */
80 __u32 max_dev
; /* size of devs[] array to consider */
81 __u8 pad3
[64-32]; /* set to 0 when writing */
83 /* device state information. Indexed by dev_number.
85 * Note there are no per-device state flags. State information is rolled
86 * into the 'roles' value. If a device is spare or faulty, then it doesn't
87 * have a meaningful role.
89 __u16 dev_roles
[0]; /* role in array, or 0xffff for a spare, or 0xfffe for faulty */
92 /* feature_map bits */
93 #define MD_FEATURE_BITMAP_OFFSET 1
94 #define MD_FEATURE_RECOVERY_OFFSET 2 /* recovery_offset is present and
98 #define MD_FEATURE_ALL (1|2)
101 #define offsetof(t,f) ((int)&(((t*)0)->f))
103 static unsigned int calc_sb_1_csum(struct mdp_superblock_1
* sb
)
105 unsigned int disk_csum
, csum
;
106 unsigned long long newcsum
;
107 int size
= sizeof(*sb
) + __le32_to_cpu(sb
->max_dev
)*2;
108 unsigned int *isuper
= (unsigned int*)sb
;
111 /* make sure I can count... */
112 if (offsetof(struct mdp_superblock_1
,data_offset
) != 128 ||
113 offsetof(struct mdp_superblock_1
, utime
) != 192 ||
114 sizeof(struct mdp_superblock_1
) != 256) {
115 fprintf(stderr
, "WARNING - superblock isn't sized correctly\n");
118 disk_csum
= sb
->sb_csum
;
121 for (i
=0; size
>=4; size
-= 4 )
122 newcsum
+= __le32_to_cpu(*isuper
++);
125 newcsum
+= __le16_to_cpu(*(unsigned short*) isuper
);
127 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
128 sb
->sb_csum
= disk_csum
;
133 static void examine_super1(void *sbv
)
135 struct mdp_superblock_1
*sb
= sbv
;
142 printf(" Magic : %08x\n", __le32_to_cpu(sb
->magic
));
143 printf(" Version : %02d.%02d\n", 1, __le32_to_cpu(sb
->feature_map
));
144 printf(" Array UUID : ");
145 for (i
=0; i
<16; i
++) {
146 if ((i
&3)==0 && i
!= 0) printf(":");
147 printf("%02x", sb
->set_uuid
[i
]);
150 printf(" Name : %.32s\n", sb
->set_name
);
152 atime
= __le64_to_cpu(sb
->ctime
) & 0xFFFFFFFFFFULL
;
153 printf(" Creation Time : %.24s\n", ctime(&atime
));
154 c
=map_num(pers
, __le32_to_cpu(sb
->level
));
155 printf(" Raid Level : %s\n", c
?c
:"-unknown-");
156 printf(" Raid Devices : %d\n", __le32_to_cpu(sb
->raid_disks
));
158 printf(" Device Size : %llu%s\n", (unsigned long long)sb
->data_size
, human_size(sb
->data_size
<<9));
159 if (sb
->size
!= sb
->data_size
)
160 printf(" Used Size : %llu%s\n", (unsigned long long)sb
->size
, human_size(sb
->size
<<9));
162 printf(" Data Offset : %llu sectors\n", (unsigned long long)__le64_to_cpu(sb
->data_offset
));
163 if (sb
->super_offset
)
164 printf(" Super Offset : %llu sectors\n", (unsigned long long)__le64_to_cpu(sb
->super_offset
));
165 if (__le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RECOVERY_OFFSET
)
166 printf("Recovery Offset : %llu sectors\n", (unsigned long long)__le64_to_cpu(sb
->recovery_offset
));
167 printf(" State : %s\n", (__le64_to_cpu(sb
->resync_offset
)+1)? "active":"clean");
168 printf(" Device UUID : ");
169 for (i
=0; i
<16; i
++) {
170 if ((i
&3)==0 && i
!= 0) printf(":");
171 printf("%02x", sb
->device_uuid
[i
]);
176 if (sb
->devflags
& WriteMostly1
)
177 printf(" write-mostly");
181 atime
= __le64_to_cpu(sb
->utime
) & 0xFFFFFFFFFFULL
;
182 printf(" Update Time : %.24s\n", ctime(&atime
));
184 if (calc_sb_1_csum(sb
) == sb
->sb_csum
)
185 printf(" Checksum : %x - correct\n", __le32_to_cpu(sb
->sb_csum
));
187 printf(" Checksum : %x - expected %x\n", __le32_to_cpu(sb
->sb_csum
),
188 __le32_to_cpu(calc_sb_1_csum(sb
)));
189 printf(" Events : %llu\n", (unsigned long long)__le64_to_cpu(sb
->events
));
191 if (__le32_to_cpu(sb
->level
) == 5) {
192 c
= map_num(r5layout
, __le32_to_cpu(sb
->layout
));
193 printf(" Layout : %s\n", c
?c
:"-unknown-");
195 if (__le32_to_cpu(sb
->level
) == 10) {
196 int lo
= __le32_to_cpu(sb
->layout
);
197 printf(" Layout : near=%d, far=%d\n",
198 lo
&255, (lo
>>8)&255);
200 switch(__le32_to_cpu(sb
->level
)) {
206 printf(" Chunk Size : %dK\n", __le32_to_cpu(sb
->chunksize
/2));
209 printf(" Rounding : %dK\n", __le32_to_cpu(sb
->chunksize
/2));
214 printf(" Array State : ");
215 for (d
=0; d
<__le32_to_cpu(sb
->raid_disks
); d
++) {
219 for (i
=0; i
< __le32_to_cpu(sb
->max_dev
); i
++) {
220 int role
= __le16_to_cpu(sb
->dev_roles
[i
]);
222 if (i
== __le32_to_cpu(sb
->dev_number
))
227 if (cnt
> 1) printf("?");
228 else if (cnt
== 1 && me
) printf("U");
229 else if (cnt
== 1) printf("u");
233 for (i
=0; i
< __le32_to_cpu(sb
->max_dev
); i
++) {
234 int role
= __le16_to_cpu(sb
->dev_roles
[i
]);
238 if (faulty
) printf(" %d failed", faulty
);
243 static void brief_examine_super1(void *sbv
)
245 struct mdp_superblock_1
*sb
= sbv
;
248 char *c
=map_num(pers
, __le32_to_cpu(sb
->level
));
250 printf("ARRAY /dev/?? level=%s metadata=1 num-devices=%d UUID=",
251 c
?c
:"-unknown-", sb
->raid_disks
);
252 for (i
=0; i
<16; i
++) {
253 printf("%02x", sb
->set_uuid
[i
]);
254 if ((i
&3)==0 && i
!= 0) printf(":");
257 printf(" name=%.32s", sb
->set_name
);
261 static void detail_super1(void *sbv
)
263 struct mdp_superblock_1
*sb
= sbv
;
266 printf(" Name : %.32s\n", sb
->set_name
);
268 for (i
=0; i
<16; i
++) {
269 if ((i
&3)==0 && i
!= 0) printf(":");
270 printf("%02x", sb
->set_uuid
[i
]);
272 printf("\n Events : %llu\n\n", (unsigned long long)__le64_to_cpu(sb
->events
));
275 static void brief_detail_super1(void *sbv
)
277 struct mdp_superblock_1
*sb
= sbv
;
281 printf(" name=%.32s", sb
->set_name
);
283 for (i
=0; i
<16; i
++) {
284 if ((i
&3)==0 && i
!= 0) printf(":");
285 printf("%02x", sb
->set_uuid
[i
]);
291 static void uuid_from_super1(int uuid
[4], void * sbv
)
293 struct mdp_superblock_1
*super
= sbv
;
294 char *cuuid
= (char*)uuid
;
297 cuuid
[i
] = super
->set_uuid
[i
];
300 static void getinfo_super1(struct mdinfo
*info
, mddev_ident_t ident
, void *sbv
)
302 struct mdp_superblock_1
*sb
= sbv
;
307 info
->array
.major_version
= 1;
308 info
->array
.minor_version
= __le32_to_cpu(sb
->feature_map
);
309 info
->array
.patch_version
= 0;
310 info
->array
.raid_disks
= __le32_to_cpu(sb
->raid_disks
);
311 info
->array
.level
= __le32_to_cpu(sb
->level
);
312 info
->array
.layout
= __le32_to_cpu(sb
->layout
);
313 info
->array
.md_minor
= -1;
314 info
->array
.ctime
= __le64_to_cpu(sb
->ctime
);
316 info
->disk
.major
= 0;
317 info
->disk
.minor
= 0;
318 info
->disk
.number
= __le32_to_cpu(sb
->dev_number
);
319 if (__le32_to_cpu(sb
->dev_number
) >= __le32_to_cpu(sb
->max_dev
) ||
320 __le32_to_cpu(sb
->max_dev
) > 512)
323 role
= __le16_to_cpu(sb
->dev_roles
[__le32_to_cpu(sb
->dev_number
)]);
325 info
->disk
.raid_disk
= -1;
328 info
->disk
.state
= 2; /* spare: ACTIVE, not sync, not faulty */
331 info
->disk
.state
= 1; /* faulty */
334 info
->disk
.state
= 6; /* active and in sync */
335 info
->disk
.raid_disk
= role
;
337 info
->events
= __le64_to_cpu(sb
->events
);
339 memcpy(info
->uuid
, sb
->set_uuid
, 16);
341 strncpy(ident
->name
, sb
->set_name
, 32);
344 for (i
=0; i
< __le32_to_cpu(sb
->max_dev
); i
++) {
345 role
= __le16_to_cpu(sb
->dev_roles
[i
]);
346 if (/*role == 0xFFFF || */role
< info
->array
.raid_disks
)
350 info
->array
.working_disks
= working
;
353 static int update_super1(struct mdinfo
*info
, void *sbv
, char *update
, char *devname
, int verbose
)
356 struct mdp_superblock_1
*sb
= sbv
;
358 if (strcmp(update
, "force")==0) {
359 sb
->events
= __cpu_to_le64(info
->events
);
360 switch(__le32_to_cpu(sb
->level
)) {
361 case 5: case 4: case 6:
362 /* need to force clean */
363 sb
->resync_offset
= ~0ULL;
366 if (strcmp(update
, "assemble")==0) {
367 int d
= info
->disk
.number
;
369 if (info
->disk
.state
== 6)
370 want
= __cpu_to_le32(info
->disk
.raid_disk
);
373 if (sb
->dev_roles
[d
] != want
) {
374 sb
->dev_roles
[d
] = want
;
379 if (strcmp(update
, "newdev") == 0) {
380 int d
= info
->disk
.number
;
381 memset(&sb
->disks
[d
], 0, sizeof(sb
->disks
[d
]));
382 sb
->disks
[d
].number
= d
;
383 sb
->disks
[d
].major
= info
->disk
.major
;
384 sb
->disks
[d
].minor
= info
->disk
.minor
;
385 sb
->disks
[d
].raid_disk
= info
->disk
.raid_disk
;
386 sb
->disks
[d
].state
= info
->disk
.state
;
387 sb
->this_disk
= sb
->disks
[d
];
390 if (strcmp(update
, "grow") == 0) {
391 sb
->raid_disks
= __cpu_to_le32(info
->array
.raid_disks
);
394 if (strcmp(update
, "resync") == 0) {
395 /* make sure resync happens */
396 sb
->resync_offset
= ~0ULL;
398 if (strcmp(update
, "uuid") == 0)
399 memcpy(sb
->set_uuid
, info
->uuid
, 16);
401 sb
->sb_csum
= calc_sb_1_csum(sb
);
406 static __u64
event_super1(void *sbv
)
408 struct mdp_superblock_1
*sb
= sbv
;
409 return __le64_to_cpu(sb
->events
);
412 static int init_super1(struct supertype
*st
, void **sbp
, mdu_array_info_t
*info
, unsigned long long size
, char *name
)
414 struct mdp_superblock_1
*sb
= malloc(1024 + sizeof(bitmap_super_t
));
419 if (info
->major_version
== -1)
420 /* zeroing superblock */
423 spares
= info
->working_disks
- info
->active_disks
;
424 if (info
->raid_disks
+ spares
> 384) {
425 fprintf(stderr
, Name
": too many devices requested: %d+%d > %d\n",
426 info
->raid_disks
, spares
, 384);
431 sb
->magic
= __cpu_to_le32(MD_SB_MAGIC
);
432 sb
->major_version
= __cpu_to_le32(1);
436 if ((rfd
= open("/dev/urandom", O_RDONLY
)) < 0 ||
437 read(rfd
, sb
->set_uuid
, 16) != 16) {
438 *(__u32
*)(sb
->set_uuid
) = random();
439 *(__u32
*)(sb
->set_uuid
+4) = random();
440 *(__u32
*)(sb
->set_uuid
+8) = random();
441 *(__u32
*)(sb
->set_uuid
+12) = random();
443 if (rfd
>= 0) close(rfd
);
445 memset(sb
->set_name
, 0, 32);
446 strcpy(sb
->set_name
, name
);
448 sb
->ctime
= __cpu_to_le64((unsigned long long)time(0));
449 sb
->level
= __cpu_to_le32(info
->level
);
450 sb
->layout
= __cpu_to_le32(info
->layout
);
451 sb
->size
= __cpu_to_le64(size
*2ULL);
452 sb
->chunksize
= __cpu_to_le32(info
->chunk_size
>>9);
453 sb
->raid_disks
= __cpu_to_le32(info
->raid_disks
);
455 sb
->data_offset
= __cpu_to_le64(0);
456 sb
->data_size
= __cpu_to_le64(0);
457 sb
->super_offset
= __cpu_to_le64(0);
458 sb
->recovery_offset
= __cpu_to_le64(0);
460 sb
->utime
= sb
->ctime
;
461 sb
->events
= __cpu_to_le64(1);
462 if (info
->state
& (1<<MD_SB_CLEAN
))
463 sb
->resync_offset
= ~0ULL;
465 sb
->resync_offset
= 0;
466 sb
->max_dev
= __cpu_to_le32((1024- sizeof(struct mdp_superblock_1
))/
467 sizeof(sb
->dev_roles
[0]));
468 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
470 memset(sb
->dev_roles
, 0xff, 1024 - sizeof(struct mdp_superblock_1
));
476 /* Add a device to the superblock being created */
477 static void add_to_super1(void *sbv
, mdu_disk_info_t
*dk
)
479 struct mdp_superblock_1
*sb
= sbv
;
480 __u16
*rp
= sb
->dev_roles
+ dk
->number
;
481 if ((dk
->state
& 6) == 6) /* active, sync */
482 *rp
= __cpu_to_le16(dk
->raid_disk
);
483 else if ((dk
->state
& ~2) == 0) /* active or idle -> spare */
489 static int store_super1(struct supertype
*st
, int fd
, void *sbv
)
491 struct mdp_superblock_1
*sb
= sbv
;
492 unsigned long long sb_offset
;
495 unsigned long long dsize
;
498 if (ioctl(fd
, BLKGETSIZE64
, &dsize
) != 0)
501 if (ioctl(fd
, BLKGETSIZE
, &size
))
504 dsize
= (unsigned long long)size
;
512 * Calculate the position of the superblock.
513 * It is always aligned to a 4K boundary and
514 * depending on minor_version, it can be:
515 * 0: At least 8K, but less than 12K, from end of device
516 * 1: At start of device
517 * 2: 4K from start of device.
519 switch(st
->minor_version
) {
523 sb_offset
&= ~(4*2-1);
537 if (sb_offset
!= __le64_to_cpu(sb
->super_offset
) &&
538 0 != __le64_to_cpu(sb
->super_offset
)
540 fprintf(stderr
, Name
": internal error - sb_offset is wrong\n");
544 if (lseek64(fd
, sb_offset
<< 9, 0)< 0LL)
547 sbsize
= sizeof(*sb
) + 2 * __le32_to_cpu(sb
->max_dev
);
549 if (write(fd
, sb
, sbsize
) != sbsize
)
556 static int load_super1(struct supertype
*st
, int fd
, void **sbp
, char *devname
);
558 static int write_init_super1(struct supertype
*st
, void *sbv
,
559 mdu_disk_info_t
*dinfo
, char *devname
)
561 struct mdp_superblock_1
*sb
= sbv
;
563 int fd
= open(devname
, O_RDWR
| O_EXCL
);
568 unsigned long long dsize
;
573 fprintf(stderr
, Name
": Failed to open %s to write superblock\n",
578 sb
->dev_number
= __cpu_to_le32(dinfo
->number
);
579 if (dinfo
->state
& (1<<MD_DISK_WRITEMOSTLY
))
580 sb
->devflags
|= WriteMostly1
;
582 if ((rfd
= open("/dev/urandom", O_RDONLY
)) < 0 ||
583 read(rfd
, sb
->device_uuid
, 16) != 16) {
584 *(__u32
*)(sb
->device_uuid
) = random();
585 *(__u32
*)(sb
->device_uuid
+4) = random();
586 *(__u32
*)(sb
->device_uuid
+8) = random();
587 *(__u32
*)(sb
->device_uuid
+12) = random();
589 if (rfd
>= 0) close(rfd
);
592 if (load_super1(st
, fd
, &refsbv
, NULL
)==0) {
593 struct mdp_superblock_1
*refsb
= refsbv
;
595 memcpy(sb
->device_uuid
, refsb
->device_uuid
, 16);
596 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16)==0) {
597 /* same array, so preserve events and dev_number */
598 sb
->events
= refsb
->events
;
599 sb
->dev_number
= refsb
->dev_number
;
605 if (ioctl(fd
, BLKGETSIZE64
, &dsize
) != 0)
608 if (ioctl(fd
, BLKGETSIZE
, &size
))
622 * Calculate the position of the superblock.
623 * It is always aligned to a 4K boundary and
624 * depending on minor_version, it can be:
625 * 0: At least 8K, but less than 12K, from end of device
626 * 1: At start of device
627 * 2: 4K from start of device.
629 switch(st
->minor_version
) {
633 sb_offset
&= ~(4*2-1);
634 sb
->super_offset
= __cpu_to_le64(sb_offset
);
635 sb
->data_offset
= __cpu_to_le64(0);
636 sb
->data_size
= __cpu_to_le64(sb_offset
);
639 sb
->super_offset
= __cpu_to_le64(0);
640 sb
->data_offset
= __cpu_to_le64(4*2); /* leave 4k for super and bitmap */
641 sb
->data_size
= __cpu_to_le64(dsize
- 4*2);
645 sb
->super_offset
= __cpu_to_le64(sb_offset
);
646 sb
->data_offset
= __cpu_to_le64(sb_offset
+4*2);
647 sb
->data_size
= __cpu_to_le64(dsize
- 4*2 - 4*2);
654 sb
->sb_csum
= calc_sb_1_csum(sb
);
655 rv
= store_super1(st
, fd
, sb
);
657 fprintf(stderr
, Name
": failed to write superblock to %s\n", devname
);
659 if (rv
== 0 && (__le32_to_cpu(sb
->feature_map
) & 1))
660 rv
= st
->ss
->write_bitmap(st
, fd
, sbv
);
665 static int compare_super1(void **firstp
, void *secondv
)
669 * 0 same, or first was empty, and second was copied
670 * 1 second had wrong number
674 struct mdp_superblock_1
*first
= *firstp
;
675 struct mdp_superblock_1
*second
= secondv
;
677 if (second
->magic
!= __cpu_to_le32(MD_SB_MAGIC
))
679 if (second
->major_version
!= __cpu_to_le32(1))
683 first
= malloc(1024);
684 memcpy(first
, second
, 1024);
688 if (memcmp(first
->set_uuid
, second
->set_uuid
, 16)!= 0)
691 if (first
->ctime
!= second
->ctime
||
692 first
->level
!= second
->level
||
693 first
->layout
!= second
->layout
||
694 first
->size
!= second
->size
||
695 first
->chunksize
!= second
->chunksize
||
696 first
->raid_disks
!= second
->raid_disks
)
701 static int load_super1(struct supertype
*st
, int fd
, void **sbp
, char *devname
)
704 unsigned long long dsize
;
705 unsigned long long sb_offset
;
706 struct mdp_superblock_1
*super
;
710 if (st
->ss
== NULL
) {
713 /* guess... choose latest ctime */
715 for (st
->minor_version
= 0; st
->minor_version
<= 2 ; st
->minor_version
++) {
716 switch(load_super1(st
, fd
, sbp
, devname
)) {
717 case 0: super
= *sbp
;
718 if (bestvers
== -1 ||
719 bestctime
< __le64_to_cpu(super
->ctime
)) {
720 bestvers
= st
->minor_version
;
721 bestctime
= __le64_to_cpu(super
->ctime
);
726 case 1: st
->ss
= NULL
; return 1; /*bad device */
727 case 2: break; /* bad, try next */
730 if (bestvers
!= -1) {
732 st
->minor_version
= bestvers
;
735 rv
= load_super1(st
, fd
, sbp
, devname
);
736 if (rv
) st
->ss
= NULL
;
743 if (ioctl(fd
, BLKGETSIZE64
, &dsize
) != 0)
746 if (ioctl(fd
, BLKGETSIZE
, &size
)) {
748 fprintf(stderr
, Name
": cannot find device size for %s: %s\n",
749 devname
, strerror(errno
));
758 fprintf(stderr
, Name
": %s is too small for md: size is %llu sectors.\n",
764 * Calculate the position of the superblock.
765 * It is always aligned to a 4K boundary and
766 * depeding on minor_version, it can be:
767 * 0: At least 8K, but less than 12K, from end of device
768 * 1: At start of device
769 * 2: 4K from start of device.
771 switch(st
->minor_version
) {
775 sb_offset
&= ~(4*2-1);
787 ioctl(fd
, BLKFLSBUF
, 0); /* make sure we read current data */
790 if (lseek64(fd
, sb_offset
<< 9, 0)< 0LL) {
792 fprintf(stderr
, Name
": Cannot seek to superblock on %s: %s\n",
793 devname
, strerror(errno
));
797 super
= malloc(1024 + sizeof(bitmap_super_t
));
799 if (read(fd
, super
, 1024) != 1024) {
801 fprintf(stderr
, Name
": Cannot read superblock on %s\n",
807 if (__le32_to_cpu(super
->magic
) != MD_SB_MAGIC
) {
809 fprintf(stderr
, Name
": No super block found on %s (Expected magic %08x, got %08x)\n",
810 devname
, MD_SB_MAGIC
, __le32_to_cpu(super
->magic
));
815 if (__le32_to_cpu(super
->major_version
) != 1) {
817 fprintf(stderr
, Name
": Cannot interpret superblock on %s - version is %d\n",
818 devname
, __le32_to_cpu(super
->major_version
));
822 if (__le64_to_cpu(super
->super_offset
) != sb_offset
) {
824 fprintf(stderr
, Name
": No superblock found on %s (super_offset is wrong)\n",
834 static struct supertype
*match_metadata_desc1(char *arg
)
836 struct supertype
*st
= malloc(sizeof(*st
));
841 if (strcmp(arg
, "1") == 0 ||
842 strcmp(arg
, "1.0") == 0) {
843 st
->minor_version
= 0;
846 if (strcmp(arg
, "1.1") == 0) {
847 st
->minor_version
= 1;
850 if (strcmp(arg
, "1.2") == 0) {
851 st
->minor_version
= 2;
859 /* find available size on device with this devsize, using
860 * superblock type st, and reserving 'reserve' sectors for
863 static __u64
avail_size1(struct supertype
*st
, __u64 devsize
)
868 switch(st
->minor_version
) {
871 return ((devsize
- 8*2 ) & ~(4*2-1));
873 /* at start, 4K for superblock and possible bitmap */
874 return devsize
- 4*2;
876 /* 4k from start, 4K for superblock and possible bitmap */
877 return devsize
- (4+4)*2;
883 add_internal_bitmap1(struct supertype
*st
, void *sbv
,
884 int chunk
, int delay
, int write_behind
, unsigned long long size
, int may_change
, int major
)
887 * If not may_change, then this is a 'Grow', and the bitmap
888 * must fit after the superblock.
889 * If may_change, then this is create, and we can put the bitmap
890 * before the superblock if we like, or may move the start.
891 * For now, just squeeze the bitmap into 3k and don't change anything.
893 * size is in sectors, chunk is in bytes !!!
896 unsigned long long bits
;
897 unsigned long long max_bits
= (3*512 - sizeof(bitmap_super_t
)) * 8;
898 unsigned long long min_chunk
;
899 struct mdp_superblock_1
*sb
= sbv
;
900 bitmap_super_t
*bms
= (bitmap_super_t
*)(((char*)sb
) + 1024);
902 if (st
->minor_version
&& !may_change
&&
903 __le64_to_cpu(sb
->data_offset
) - __le64_to_cpu(sb
->super_offset
) < 8)
904 return 0; /* doesn't fit */
908 min_chunk
= 4096; /* sub-page chunks don't work yet.. */
909 bits
= (size
*512)/min_chunk
+1;
910 while (bits
> max_bits
) {
916 else if (chunk
< min_chunk
)
917 return 0; /* chunk size too small */
919 sb
->bitmap_offset
= __cpu_to_le32(2);
921 sb
->feature_map
= __cpu_to_le32(__le32_to_cpu(sb
->feature_map
) | 1);
922 memset(bms
, 0, sizeof(*bms
));
923 bms
->magic
= __cpu_to_le32(BITMAP_MAGIC
);
924 bms
->version
= __cpu_to_le32(major
);
925 uuid_from_super1((int*)bms
->uuid
, sb
);
926 bms
->chunksize
= __cpu_to_le32(chunk
);
927 bms
->daemon_sleep
= __cpu_to_le32(delay
);
928 bms
->sync_size
= __cpu_to_le64(size
);
929 bms
->write_behind
= __cpu_to_le32(write_behind
);
935 void locate_bitmap1(struct supertype
*st
, int fd
, void *sbv
)
937 unsigned long long offset
;
938 struct mdp_superblock_1
*sb
;
941 if (st
->ss
->load_super(st
, fd
, sbv
, NULL
))
942 return; /* no error I hope... */
946 offset
= __le64_to_cpu(sb
->super_offset
);
947 offset
+= (long) __le32_to_cpu(sb
->bitmap_offset
);
950 lseek64(fd
, offset
<<9, 0);
953 int write_bitmap1(struct supertype
*st
, int fd
, void *sbv
)
955 struct mdp_superblock_1
*sb
= sbv
;
956 bitmap_super_t
*bms
= (bitmap_super_t
*)(((char*)sb
)+1024);
962 locate_bitmap1(st
, fd
, sbv
);
964 write(fd
, ((char*)sb
)+1024, sizeof(bitmap_super_t
));
965 towrite
= __le64_to_cpu(bms
->sync_size
) / (__le32_to_cpu(bms
->chunksize
)>>9);
966 towrite
= (towrite
+7) >> 3; /* bits to bytes */
967 memset(buf
, 0xff, sizeof(buf
));
968 while (towrite
> 0) {
972 n
= write(fd
, buf
, n
);
985 struct superswitch super1
= {
987 .examine_super
= examine_super1
,
988 .brief_examine_super
= brief_examine_super1
,
989 .detail_super
= detail_super1
,
990 .brief_detail_super
= brief_detail_super1
,
992 .uuid_from_super
= uuid_from_super1
,
993 .getinfo_super
= getinfo_super1
,
994 .update_super
= update_super1
,
995 .event_super
= event_super1
,
996 .init_super
= init_super1
,
997 .add_to_super
= add_to_super1
,
998 .store_super
= store_super1
,
999 .write_init_super
= write_init_super1
,
1000 .compare_super
= compare_super1
,
1001 .load_super
= load_super1
,
1002 .match_metadata_desc
= match_metadata_desc1
,
1003 .avail_size
= avail_size1
,
1004 .add_internal_bitmap
= add_internal_bitmap1
,
1005 .locate_bitmap
= locate_bitmap1
,
1006 .write_bitmap
= write_bitmap1
,
1008 #if __BYTE_ORDER == BIG_ENDIAN