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82d9eba6 NB |
1 | /* |
2 | * mdadm - manage Linux "md" devices aka RAID arrays. | |
3 | * | |
4 | * Copyright (C) 2001-2004 Neil Brown <neilb@cse.unsw.edu.au> | |
5 | * | |
6 | * | |
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. | |
11 | * | |
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. | |
16 | * | |
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 | |
20 | * | |
21 | * Author: Neil Brown | |
22 | * Email: <neilb@cse.unsw.edu.au> | |
23 | * Paper: Neil Brown | |
24 | * School of Computer Science and Engineering | |
25 | * The University of New South Wales | |
26 | * Sydney, 2052 | |
27 | * Australia | |
28 | */ | |
29 | ||
30 | #include "mdadm.h" | |
31 | ||
32 | #include "asm/byteorder.h" | |
33 | /* | |
34 | * The version-1 superblock : | |
35 | * All numeric fields are little-endian. | |
36 | * | |
37 | * total size: 256 bytes plus 2 per device. | |
38 | * 1K allows 384 devices. | |
39 | */ | |
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 */ | |
46 | ||
47 | __u8 set_uuid[16]; /* user-space generated. */ | |
48 | char set_name[32]; /* set and interpreted by user-space */ | |
49 | ||
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 */ | |
54 | ||
55 | __u32 chunksize; /* in 512byte sectors */ | |
56 | __u32 raid_disks; | |
57 | __u8 pad1[128-96]; /* set to 0 when written */ | |
58 | ||
59 | /* constant this-device information - 64 bytes */ | |
60 | __u64 data_offset; /* sector start of data, often 0 */ | |
61 | __u64 data_size; /* sectors in this device that can be used for data */ | |
62 | __u64 super_offset; /* sector start of this superblock */ | |
63 | __u64 recovery_offset;/* sectors before this offset (from data_offset) have been recovered */ | |
64 | __u32 dev_number; /* permanent identifier of this device - not role in raid */ | |
65 | __u32 cnt_corrected_read; /* number of read errors that were corrected by re-writing */ | |
66 | __u8 device_uuid[16]; /* user-space setable, ignored by kernel */ | |
67 | __u8 pad2[64-56]; /* set to 0 when writing */ | |
68 | ||
69 | /* array state information - 64 bytes */ | |
70 | __u64 utime; /* 40 bits second, 24 btes microseconds */ | |
71 | __u64 events; /* incremented when superblock updated */ | |
72 | __u64 resync_offset; /* data before this offset (from data_offset) known to be in sync */ | |
73 | __u32 sb_csum; /* checksum upto devs[max_dev] */ | |
74 | __u32 max_dev; /* size of devs[] array to consider */ | |
75 | __u8 pad3[64-32]; /* set to 0 when writing */ | |
76 | ||
77 | /* device state information. Indexed by dev_number. | |
78 | * 2 bytes per device | |
79 | * Note there are no per-device state flags. State information is rolled | |
80 | * into the 'roles' value. If a device is spare or faulty, then it doesn't | |
81 | * have a meaningful role. | |
82 | */ | |
83 | __u16 dev_roles[0]; /* role in array, or 0xffff for a spare, or 0xfffe for faulty */ | |
84 | }; | |
85 | ||
86 | #define offsetof(t,f) ((int)&(((t*)0)->f)) | |
87 | static unsigned int calc_sb_1_csum(struct mdp_superblock_1 * sb) | |
88 | { | |
89 | unsigned int disk_csum, csum; | |
90 | unsigned long long newcsum; | |
91 | int size = sizeof(*sb) + __le32_to_cpu(sb->max_dev)*2; | |
92 | unsigned int *isuper = (unsigned int*)sb; | |
93 | int i; | |
94 | ||
95 | /* make sure I can count... */ | |
96 | if (offsetof(struct mdp_superblock_1,data_offset) != 128 || | |
97 | offsetof(struct mdp_superblock_1, utime) != 192 || | |
98 | sizeof(struct mdp_superblock_1) != 256) { | |
99 | fprintf(stderr, "WARNING - superblock isn't sized correctly\n"); | |
100 | } | |
101 | ||
102 | disk_csum = sb->sb_csum; | |
103 | sb->sb_csum = 0; | |
104 | newcsum = 0; | |
105 | for (i=0; size>=4; size -= 4 ) | |
106 | newcsum += __le32_to_cpu(*isuper++); | |
107 | ||
108 | if (size == 2) | |
109 | newcsum += __le16_to_cpu(*(unsigned short*) isuper); | |
110 | ||
111 | csum = (newcsum & 0xffffffff) + (newcsum >> 32); | |
112 | sb->sb_csum = disk_csum; | |
113 | return csum; | |
114 | } | |
115 | ||
116 | ||
117 | static void examine_super1(void *sbv) | |
118 | { | |
119 | struct mdp_superblock_1 *sb = sbv; | |
120 | time_t atime; | |
121 | int d; | |
122 | int spares, faulty; | |
123 | int i; | |
124 | char *c; | |
125 | ||
126 | printf(" Magic : %08x\n", __le32_to_cpu(sb->magic)); | |
127 | printf(" Version : %02d.%02d\n", 1, __le32_to_cpu(sb->feature_map)); | |
128 | printf(" Array UUID : "); | |
129 | for (i=0; i<16; i++) { | |
130 | printf("%02x", sb->set_uuid[i]); | |
131 | if ((i&3)==0 && i != 0) printf(":"); | |
132 | } | |
133 | printf("\n"); | |
134 | printf(" Name : %.32s\n", sb->set_name); | |
135 | ||
136 | atime = __le64_to_cpu(sb->ctime) & 0xFFFFFFFFFFULL; | |
137 | printf(" Creation Time : %.24s\n", ctime(&atime)); | |
138 | c=map_num(pers, __le32_to_cpu(sb->level)); | |
139 | printf(" Raid Level : %s\n", c?c:"-unknown-"); | |
140 | printf(" Raid Devices : %d\n", __le32_to_cpu(sb->raid_disks)); | |
141 | printf("\n"); | |
142 | printf(" Device Size : %llu%s\n", sb->data_size, human_size(sb->data_size<<9)); | |
143 | if (sb->data_offset) | |
144 | printf(" Data Offset : %llu sectors\n", __le64_to_cpu(sb->data_offset)); | |
145 | if (sb->super_offset) | |
146 | printf(" Super Offset : %llu sectors\n", __le64_to_cpu(sb->super_offset)); | |
147 | printf(" Device UUID : "); | |
148 | for (i=0; i<16; i++) { | |
149 | printf("%02x", sb->set_uuid[i]); | |
150 | if ((i&3)==0 && i != 0) printf(":"); | |
151 | } | |
152 | printf("\n"); | |
153 | ||
154 | atime = __le64_to_cpu(sb->utime) & 0xFFFFFFFFFFULL; | |
155 | printf(" Update Time : %.24s\n", ctime(&atime)); | |
156 | ||
157 | if (calc_sb_1_csum(sb) == sb->sb_csum) | |
158 | printf(" Checksum : %x - correct\n", __le32_to_cpu(sb->sb_csum)); | |
159 | else | |
160 | printf(" Checksum : %x - expected %x\n", __le32_to_cpu(sb->sb_csum), | |
161 | __le32_to_cpu(calc_sb_1_csum(sb))); | |
162 | printf(" Events : %llu\n", __le64_to_cpu(sb->events)); | |
163 | printf("\n"); | |
164 | if (__le32_to_cpu(sb->level) == 5) { | |
165 | c = map_num(r5layout, __le32_to_cpu(sb->layout)); | |
166 | printf(" Layout : %s\n", c?c:"-unknown-"); | |
167 | } | |
168 | switch(__le32_to_cpu(sb->level)) { | |
169 | case 0: | |
170 | case 4: | |
171 | case 5: | |
172 | printf(" Chunk Size : %dK\n", __le32_to_cpu(sb->chunksize/2)); | |
173 | break; | |
174 | case -1: | |
175 | printf(" Rounding : %dK\n", __le32_to_cpu(sb->chunksize/2)); | |
176 | break; | |
177 | default: break; | |
178 | } | |
179 | printf("\n"); | |
180 | printf(" Array State : "); | |
181 | for (d=0; d<__le32_to_cpu(sb->raid_disks); d++) { | |
182 | int cnt = 0; | |
183 | int me = 0; | |
184 | int i; | |
185 | for (i=0; i< __le32_to_cpu(sb->max_dev); i++) { | |
186 | int role = __le16_to_cpu(sb->dev_roles[i]); | |
187 | if (role == d) { | |
188 | if (i == __le32_to_cpu(sb->dev_number)) | |
189 | me = 1; | |
190 | cnt++; | |
191 | } | |
192 | } | |
193 | if (cnt > 1) printf("?"); | |
194 | else if (cnt == 1 && me) printf("U"); | |
195 | else if (cnt == 1) printf("u"); | |
196 | else printf ("_"); | |
197 | } | |
198 | spares = faulty = 0; | |
199 | for (i=0; i< __le32_to_cpu(sb->max_dev); i++) { | |
200 | int role = __le16_to_cpu(sb->dev_roles[i]); | |
201 | switch (role) { | |
202 | case 0xFFFF: spares++; break; | |
203 | case 0xFFFE: faulty++; | |
204 | } | |
205 | } | |
206 | if (spares) printf(" %d spares", spares); | |
207 | if (faulty) printf(" %d failed", faulty); | |
208 | printf("\n"); | |
209 | } | |
210 | ||
211 | ||
212 | static void brief_examine_super1(void *sbv) | |
213 | { | |
214 | struct mdp_superblock_1 *sb = sbv; | |
215 | int i; | |
216 | ||
217 | char *c=map_num(pers, __le32_to_cpu(sb->level)); | |
218 | ||
219 | printf("ARRAY /dev/?? level=%s metadata=1 num-devices=%d UUID=", | |
220 | c?c:"-unknown-", sb->raid_disks); | |
221 | for (i=0; i<16; i++) { | |
222 | printf("%02x", sb->set_uuid[i]); | |
223 | if ((i&3)==0 && i != 0) printf(":"); | |
224 | } | |
225 | printf("\n"); | |
226 | } | |
227 | ||
228 | static void detail_super1(void *sbv) | |
229 | { | |
230 | struct mdp_superblock_1 *sb = sbv; | |
231 | int i; | |
232 | ||
233 | printf(" UUID : "); | |
234 | for (i=0; i<16; i++) { | |
235 | printf("%02x", sb->set_uuid[i]); | |
236 | if ((i&3)==0 && i != 0) printf(":"); | |
237 | } | |
238 | printf("\n Events : %llu\n\n", __le64_to_cpu(sb->events)); | |
239 | } | |
240 | ||
241 | static void brief_detail_super1(void *sbv) | |
242 | { | |
243 | struct mdp_superblock_1 *sb = sbv; | |
244 | int i; | |
245 | ||
246 | printf(" UUID="); | |
247 | for (i=0; i<16; i++) { | |
248 | printf("%02x", sb->set_uuid[i]); | |
249 | if ((i&3)==0 && i != 0) printf(":"); | |
250 | } | |
251 | } | |
252 | ||
253 | static void uuid_from_super1(int uuid[4], void * sbv) | |
254 | { | |
255 | struct mdp_superblock_1 *super = sbv; | |
256 | char *cuuid = (char*)uuid; | |
257 | int i; | |
258 | for (i=0; i<16; i++) | |
259 | cuuid[i] = super->set_uuid[i]; | |
260 | } | |
261 | ||
262 | static void getinfo_super1(struct mdinfo *info, void *sbv) | |
263 | { | |
264 | struct mdp_superblock_1 *sb = sbv; | |
265 | int working = 0; | |
266 | int i; | |
267 | int role; | |
268 | ||
269 | info->array.major_version = 1; | |
270 | info->array.minor_version = __le32_to_cpu(sb->feature_map); | |
271 | info->array.patch_version = 0; | |
272 | info->array.raid_disks = __le32_to_cpu(sb->raid_disks); | |
273 | info->array.level = __le32_to_cpu(sb->level); | |
274 | info->array.md_minor = -1; | |
275 | info->array.ctime = __le64_to_cpu(sb->ctime); | |
276 | ||
277 | info->disk.major = 0; | |
278 | info->disk.minor = 0; | |
279 | ||
280 | if (__le32_to_cpu(sb->dev_number) >= __le32_to_cpu(sb->max_dev) || | |
281 | __le32_to_cpu(sb->max_dev) > 512) | |
282 | role = 0xfffe; | |
283 | else | |
284 | role = __le16_to_cpu(sb->dev_roles[__le32_to_cpu(sb->dev_number)]); | |
285 | ||
286 | info->disk.raid_disk = -1; | |
287 | switch(role) { | |
288 | case 0xFFFF: | |
289 | info->disk.state = 2; /* spare: ACTIVE, not sync, not faulty */ | |
290 | break; | |
291 | case 0xFFFE: | |
292 | info->disk.state = 1; /* faulty */ | |
293 | break; | |
294 | default: | |
295 | info->disk.state = 6; /* active and in sync */ | |
296 | info->disk.raid_disk = role; | |
297 | } | |
298 | info->events = __le64_to_cpu(sb->events); | |
299 | ||
300 | memcpy(info->uuid, sb->set_uuid, 16); | |
301 | ||
302 | for (i=0; i< __le32_to_cpu(sb->max_dev); i++) { | |
303 | role = __le16_to_cpu(sb->dev_roles[i]); | |
304 | if (role == 0xFFFF || role < info->array.raid_disks) | |
305 | working++; | |
306 | } | |
307 | ||
308 | info->array.working_disks = working; | |
309 | } | |
310 | ||
311 | static int update_super1(struct mdinfo *info, void *sbv, char *update, char *devname, int verbose) | |
312 | { | |
313 | int rv = 0; | |
314 | struct mdp_superblock_1 *sb = sbv; | |
315 | ||
316 | if (strcmp(update, "force")==0) { | |
317 | sb->events = __cpu_to_le32(info->events); | |
318 | switch(__le32_to_cpu(sb->level)) { | |
319 | case 5: case 4: case 6: | |
320 | /* need to force clean */ | |
321 | sb->resync_offset = ~0ULL; | |
322 | } | |
323 | } | |
324 | if (strcmp(update, "assemble")==0) { | |
325 | int d = info->disk.number; | |
326 | int want; | |
327 | if (info->disk.state == 6) | |
328 | want = __cpu_to_le32(info->disk.raid_disk); | |
329 | else | |
330 | want = 0xFFFF; | |
331 | if (sb->dev_roles[d] != want) { | |
332 | sb->dev_roles[d] = want; | |
333 | rv = 1; | |
334 | } | |
335 | } | |
336 | #if 0 | |
337 | if (strcmp(update, "newdev") == 0) { | |
338 | int d = info->disk.number; | |
339 | memset(&sb->disks[d], 0, sizeof(sb->disks[d])); | |
340 | sb->disks[d].number = d; | |
341 | sb->disks[d].major = info->disk.major; | |
342 | sb->disks[d].minor = info->disk.minor; | |
343 | sb->disks[d].raid_disk = info->disk.raid_disk; | |
344 | sb->disks[d].state = info->disk.state; | |
345 | sb->this_disk = sb->disks[d]; | |
346 | } | |
347 | #endif | |
348 | if (strcmp(update, "grow") == 0) { | |
349 | sb->raid_disks = __cpu_to_le32(info->array.raid_disks); | |
350 | /* FIXME */ | |
351 | } | |
352 | if (strcmp(update, "resync") == 0) { | |
353 | /* make sure resync happens */ | |
354 | sb->resync_offset = ~0ULL; | |
355 | } | |
356 | ||
357 | sb->sb_csum = calc_sb_1_csum(sb); | |
358 | return rv; | |
359 | } | |
360 | ||
361 | ||
362 | static __u64 event_super1(void *sbv) | |
363 | { | |
364 | struct mdp_superblock_1 *sb = sbv; | |
365 | return __le64_to_cpu(sb->events); | |
366 | } | |
367 | ||
368 | static int init_super1(void **sbp, mdu_array_info_t *info) | |
369 | { | |
370 | struct mdp_superblock_1 *sb = malloc(1024); | |
371 | int spares; | |
372 | memset(sb, 0, 1024); | |
373 | ||
374 | if (info->major_version == -1) | |
375 | /* zeroing superblock */ | |
376 | return 0; | |
377 | ||
378 | spares = info->working_disks - info->active_disks; | |
379 | if (info->raid_disks + spares > 384) { | |
380 | fprintf(stderr, Name ": too many devices requested: %d+%d > %d\n", | |
381 | info->raid_disks , spares, 384); | |
382 | return 0; | |
383 | } | |
384 | ||
385 | ||
386 | sb->magic = __cpu_to_le32(MD_SB_MAGIC); | |
387 | sb->major_version = __cpu_to_le32(1); | |
388 | sb->feature_map = 0; | |
389 | sb->pad0 = 0; | |
390 | *(__u32*)(sb->set_uuid) = random(); | |
391 | *(__u32*)(sb->set_uuid+4) = random(); | |
392 | *(__u32*)(sb->set_uuid+8) = random(); | |
393 | *(__u32*)(sb->set_uuid+12) = random(); | |
394 | ||
395 | /* FIXME name */ | |
396 | ||
397 | sb->ctime = __cpu_to_le64((unsigned long long)time(0)); | |
398 | sb->level = __cpu_to_le32(info->level); | |
399 | sb->layout = __cpu_to_le32(info->level); | |
400 | sb->size = __cpu_to_le64(info->size*2ULL); | |
401 | sb->chunksize = __cpu_to_le32(info->chunk_size>>9); | |
402 | sb->raid_disks = __cpu_to_le32(info->raid_disks); | |
403 | ||
404 | sb->data_offset = __cpu_to_le64(0); | |
405 | sb->data_size = __cpu_to_le64(0); | |
406 | sb->super_offset = __cpu_to_le64(0); | |
407 | sb->recovery_offset = __cpu_to_le64(0); | |
408 | ||
409 | sb->utime = sb->ctime; | |
410 | sb->events = __cpu_to_le64(1); | |
411 | if (info->state & MD_SB_CLEAN) | |
412 | sb->resync_offset = ~0ULL; | |
413 | else | |
414 | sb->resync_offset = 0; | |
415 | sb->max_dev = __cpu_to_le32((1024- sizeof(struct mdp_superblock_1))/ | |
416 | sizeof(sb->dev_roles[0])); | |
417 | memset(sb->pad3, 0, sizeof(sb->pad3)); | |
418 | ||
419 | memset(sb->dev_roles, 0xff, 1024 - sizeof(struct mdp_superblock_1)); | |
420 | ||
421 | *sbp = sb; | |
422 | return 1; | |
423 | } | |
424 | ||
425 | /* Add a device to the superblock being created */ | |
426 | static void add_to_super1(void *sbv, mdu_disk_info_t *dk) | |
427 | { | |
428 | struct mdp_superblock_1 *sb = sbv; | |
429 | __u16 *rp = sb->dev_roles + dk->number; | |
430 | if (dk->state == 6) /* active, sync */ | |
431 | *rp = __cpu_to_le16(dk->raid_disk); | |
432 | else if (dk->state == 2) /* active -> spare */ | |
433 | *rp = 0xffff; | |
434 | else | |
435 | *rp = 0xfffe; | |
436 | } | |
437 | ||
438 | static int store_super1(int fd, void *sbv) | |
439 | { | |
440 | struct mdp_superblock_1 *sb = sbv; | |
441 | long long sb_offset; | |
442 | int sbsize; | |
443 | ||
444 | ||
445 | sb_offset = __le64_to_cpu(sb->super_offset) << 9; | |
446 | ||
447 | if (lseek64(fd, sb_offset, 0)< 0LL) | |
448 | return 3; | |
449 | ||
450 | sbsize = sizeof(*sb) + 2 * __le32_to_cpu(sb->max_dev); | |
451 | ||
452 | if (write(fd, sb, sbsize) != sbsize) | |
453 | return 4; | |
454 | ||
455 | return 0; | |
456 | } | |
457 | ||
458 | static int write_init_super1(struct supertype *st, void *sbv, mdu_disk_info_t *dinfo, char *devname) | |
459 | { | |
460 | struct mdp_superblock_1 *sb = sbv; | |
461 | int fd = open(devname, O_RDWR, O_EXCL); | |
462 | int rv; | |
463 | ||
464 | long size; | |
465 | long long sb_offset; | |
466 | ||
467 | ||
468 | if (fd < 0) { | |
469 | fprintf(stderr, Name ": Failed to open %s to write superblock\n", | |
470 | devname); | |
471 | return -1; | |
472 | } | |
473 | ||
474 | sb->dev_number = __cpu_to_le32(dinfo->number); | |
475 | *(__u32*)(sb->device_uuid) = random(); | |
476 | *(__u32*)(sb->device_uuid+4) = random(); | |
477 | *(__u32*)(sb->device_uuid+8) = random(); | |
478 | *(__u32*)(sb->device_uuid+12) = random(); | |
479 | ||
480 | ||
024ce7fe NB |
481 | if (ioctl(fd, BLKGETSIZE, &size)) { |
482 | close(fd); | |
82d9eba6 | 483 | return 1; |
024ce7fe | 484 | } |
82d9eba6 | 485 | |
024ce7fe NB |
486 | if (size < 24) { |
487 | close(fd); | |
82d9eba6 | 488 | return 2; |
024ce7fe | 489 | } |
82d9eba6 NB |
490 | |
491 | ||
492 | /* | |
493 | * Calculate the position of the superblock. | |
494 | * It is always aligned to a 4K boundary and | |
495 | * depending on minor_version, it can be: | |
496 | * 0: At least 8K, but less than 12K, from end of device | |
497 | * 1: At start of device | |
498 | * 2: 4K from start of device. | |
499 | */ | |
500 | switch(st->minor_version) { | |
501 | case 0: | |
502 | sb_offset = size; | |
503 | sb_offset -= 8*2; | |
504 | sb_offset &= ~(4*2-1); | |
505 | sb->super_offset = __cpu_to_le64(sb_offset); | |
506 | sb->data_offset = __cpu_to_le64(0); | |
507 | sb->data_size = sb->super_offset; | |
508 | break; | |
509 | case 1: | |
510 | sb->super_offset = __cpu_to_le64(0); | |
511 | sb->data_offset = __cpu_to_le64(2); | |
512 | sb->data_size = __cpu_to_le64(size - 2); | |
513 | break; | |
514 | case 2: | |
515 | sb_offset = 4*2; | |
516 | sb->super_offset = __cpu_to_le64(sb_offset); | |
517 | sb->data_offset = __cpu_to_le64(sb_offset+2); | |
518 | sb->data_size = __cpu_to_le64(size - 4*2 - 2); | |
519 | break; | |
520 | default: | |
521 | return -EINVAL; | |
522 | } | |
523 | ||
524 | ||
525 | sb->sb_csum = calc_sb_1_csum(sb); | |
526 | rv = store_super1(fd, sb); | |
527 | if (rv) | |
528 | fprintf(stderr, Name ": failed to write superblock to %s\n", devname); | |
024ce7fe | 529 | close(fd); |
82d9eba6 NB |
530 | return rv; |
531 | } | |
532 | ||
533 | static int compare_super1(void **firstp, void *secondv) | |
534 | { | |
535 | /* | |
536 | * return: | |
537 | * 0 same, or first was empty, and second was copied | |
538 | * 1 second had wrong number | |
539 | * 2 wrong uuid | |
540 | * 3 wrong other info | |
541 | */ | |
542 | struct mdp_superblock_1 *first = *firstp; | |
543 | struct mdp_superblock_1 *second = secondv; | |
544 | ||
545 | if (second->magic != __cpu_to_le32(MD_SB_MAGIC)) | |
546 | return 1; | |
547 | if (second->major_version != __cpu_to_le32(1)) | |
548 | return 1; | |
549 | ||
550 | if (!first) { | |
551 | first = malloc(1024); | |
552 | memcpy(first, second, 1024); | |
553 | *firstp = first; | |
554 | return 0; | |
555 | } | |
556 | if (memcmp(first->set_uuid, second->set_uuid, 16)!= 0) | |
557 | return 2; | |
558 | ||
559 | if (first->ctime != second->ctime || | |
560 | first->level != second->level || | |
561 | first->layout != second->layout || | |
562 | first->size != second->size || | |
563 | first->chunksize != second->chunksize || | |
564 | first->raid_disks != second->raid_disks) | |
565 | return 3; | |
566 | return 0; | |
567 | } | |
568 | ||
569 | static int load_super1(struct supertype *st, int fd, void **sbp, char *devname) | |
570 | { | |
571 | unsigned long size; | |
572 | unsigned long long sb_offset; | |
573 | struct mdp_superblock_1 *super; | |
574 | ||
575 | ||
576 | ||
577 | if (st->ss == NULL) { | |
578 | /* guess... */ | |
579 | st->ss = &super1; | |
580 | for (st->minor_version = 0; st->minor_version <= 2 ; st->minor_version++) { | |
581 | switch(load_super1(st, fd, sbp, devname)) { | |
582 | case 0: return 0; /* good */ | |
583 | case 1: st->ss = NULL; return 1; /*bad device */ | |
584 | case 2: break; /* bad, try next */ | |
585 | } | |
586 | } | |
587 | st->ss = NULL; | |
588 | return 2; | |
589 | } | |
590 | if (ioctl(fd, BLKGETSIZE, &size)) { | |
591 | if (devname) | |
592 | fprintf(stderr, Name ": cannot find device size for %s: %s\n", | |
593 | devname, strerror(errno)); | |
594 | return 1; | |
595 | } | |
596 | ||
597 | if (size < 24) { | |
598 | if (devname) | |
599 | fprintf(stderr, Name ": %s is too small for md: size is %lu sectors.\n", | |
600 | devname, size); | |
601 | return 1; | |
602 | } | |
603 | ||
604 | /* | |
605 | * Calculate the position of the superblock. | |
606 | * It is always aligned to a 4K boundary and | |
607 | * depeding on minor_version, it can be: | |
608 | * 0: At least 8K, but less than 12K, from end of device | |
609 | * 1: At start of device | |
610 | * 2: 4K from start of device. | |
611 | */ | |
612 | switch(st->minor_version) { | |
613 | case 0: | |
614 | sb_offset = size; | |
615 | sb_offset -= 8*2; | |
616 | sb_offset &= ~(4*2-1); | |
617 | break; | |
618 | case 1: | |
619 | sb_offset = 0; | |
620 | break; | |
621 | case 2: | |
622 | sb_offset = 4*2; | |
623 | break; | |
624 | default: | |
625 | return -EINVAL; | |
626 | } | |
627 | ||
628 | ioctl(fd, BLKFLSBUF, 0); /* make sure we read current data */ | |
629 | ||
630 | ||
631 | if (lseek64(fd, sb_offset << 9, 0)< 0LL) { | |
632 | if (devname) | |
633 | fprintf(stderr, Name ": Cannot seek to superblock on %s: %s\n", | |
634 | devname, strerror(errno)); | |
635 | return 1; | |
636 | } | |
637 | ||
638 | super = malloc(1024); | |
639 | ||
640 | if (read(fd, super, 1024) != 1024) { | |
641 | if (devname) | |
642 | fprintf(stderr, Name ": Cannot read superblock on %s\n", | |
643 | devname); | |
644 | free(super); | |
645 | return 1; | |
646 | } | |
647 | ||
648 | if (__le32_to_cpu(super->magic) != MD_SB_MAGIC) { | |
649 | if (devname) | |
650 | fprintf(stderr, Name ": No super block found on %s (Expected magic %08x, got %08x)\n", | |
651 | devname, MD_SB_MAGIC, __le32_to_cpu(super->magic)); | |
652 | free(super); | |
653 | return 2; | |
654 | } | |
655 | ||
656 | if (__le32_to_cpu(super->major_version) != 1) { | |
657 | if (devname) | |
658 | fprintf(stderr, Name ": Cannot interpret superblock on %s - version is %d\n", | |
659 | devname, __le32_to_cpu(super->major_version)); | |
660 | free(super); | |
661 | return 2; | |
662 | } | |
663 | if (__le64_to_cpu(super->super_offset) != sb_offset) { | |
664 | if (devname) | |
665 | fprintf(stderr, Name ": No superblock found on %s (super_offset is wrong)\n", | |
666 | devname); | |
667 | free(super); | |
668 | return 2; | |
669 | } | |
670 | *sbp = super; | |
671 | return 0; | |
672 | } | |
673 | ||
674 | ||
675 | static struct supertype *match_metadata_desc1(char *arg) | |
676 | { | |
677 | struct supertype *st = malloc(sizeof(*st)); | |
678 | if (!st) return st; | |
679 | ||
680 | st->ss = &super1; | |
681 | if (strcmp(arg, "1") == 0 || | |
682 | strcmp(arg, "1.0") == 0) { | |
683 | st->minor_version = 0; | |
684 | return st; | |
685 | } | |
686 | if (strcmp(arg, "1.1") == 0) { | |
687 | st->minor_version = 1; | |
688 | return st; | |
689 | } | |
690 | if (strcmp(arg, "1.2") == 0) { | |
691 | st->minor_version = 2; | |
692 | return st; | |
693 | } | |
694 | ||
695 | free(st); | |
696 | return NULL; | |
697 | } | |
698 | ||
699 | static __u64 avail_size1(__u64 devsize) | |
700 | { | |
701 | if (devsize < 24) | |
702 | return 0; | |
703 | ||
704 | return (devsize - 8*2 ) & ~(4*2-1); | |
705 | } | |
706 | ||
707 | struct superswitch super1 = { | |
708 | .examine_super = examine_super1, | |
709 | .brief_examine_super = brief_examine_super1, | |
710 | .detail_super = detail_super1, | |
711 | .brief_detail_super = brief_detail_super1, | |
712 | .uuid_from_super = uuid_from_super1, | |
713 | .getinfo_super = getinfo_super1, | |
714 | .update_super = update_super1, | |
715 | .event_super = event_super1, | |
716 | .init_super = init_super1, | |
717 | .add_to_super = add_to_super1, | |
718 | .store_super = store_super1, | |
719 | .write_init_super = write_init_super1, | |
720 | .compare_super = compare_super1, | |
721 | .load_super = load_super1, | |
722 | .match_metadata_desc = match_metadata_desc1, | |
723 | .avail_size = avail_size1, | |
724 | .major = 1, | |
725 | }; |