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Support --update=devicesize for cases where the underlying device can change size.
[thirdparty/mdadm.git] / super1.c
1 /*
2 * mdadm - manage Linux "md" devices aka RAID arrays.
3 *
4 * Copyright (C) 2001-2006 Neil Brown <neilb@suse.de>
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 * The version-1 superblock :
33 * All numeric fields are little-endian.
34 *
35 * total size: 256 bytes plus 2 per device.
36 * 1K allows 384 devices.
37 */
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 */
44
45 __u8 set_uuid[16]; /* user-space generated. */
46 char set_name[32]; /* set and interpreted by user-space */
47
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 */
52
53 __u32 chunksize; /* in 512byte sectors */
54 __u32 raid_disks;
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.
58 */
59
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 */
67
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 */
79
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 */
87
88 /* device state information. Indexed by dev_number.
89 * 2 bytes per device
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.
93 */
94 __u16 dev_roles[0]; /* role in array, or 0xffff for a spare, or 0xfffe for faulty */
95 };
96
97 struct misc_dev_info {
98 __u64 device_size;
99 };
100
101 /* feature_map bits */
102 #define MD_FEATURE_BITMAP_OFFSET 1
103 #define MD_FEATURE_RECOVERY_OFFSET 2 /* recovery_offset is present and
104 * must be honoured
105 */
106 #define MD_FEATURE_RESHAPE_ACTIVE 4
107
108 #define MD_FEATURE_ALL (1|2|4)
109
110 #ifndef offsetof
111 #define offsetof(t,f) ((size_t)&(((t*)0)->f))
112 #endif
113 static unsigned int calc_sb_1_csum(struct mdp_superblock_1 * sb)
114 {
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;
119 int i;
120
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");
126 }
127
128 disk_csum = sb->sb_csum;
129 sb->sb_csum = 0;
130 newcsum = 0;
131 for (i=0; size>=4; size -= 4 ) {
132 newcsum += __le32_to_cpu(*isuper);
133 isuper++;
134 }
135
136 if (size == 2)
137 newcsum += __le16_to_cpu(*(unsigned short*) isuper);
138
139 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
140 sb->sb_csum = disk_csum;
141 return __cpu_to_le32(csum);
142 }
143
144 #ifndef MDASSEMBLE
145 static void examine_super1(void *sbv, char *homehost)
146 {
147 struct mdp_superblock_1 *sb = sbv;
148 time_t atime;
149 int d;
150 int faulty;
151 int i;
152 char *c;
153 int l = homehost ? strlen(homehost) : 0;
154 int layout;
155
156 printf(" Magic : %08x\n", __le32_to_cpu(sb->magic));
157 printf(" Version : %02d\n", 1);
158 printf(" Feature Map : 0x%x\n", __le32_to_cpu(sb->feature_map));
159 printf(" Array UUID : ");
160 for (i=0; i<16; i++) {
161 if ((i&3)==0 && i != 0) printf(":");
162 printf("%02x", sb->set_uuid[i]);
163 }
164 printf("\n");
165 printf(" Name : %.32s", sb->set_name);
166 if (l > 0 && l < 32 &&
167 sb->set_name[l] == ':' &&
168 strncmp(sb->set_name, homehost, l) == 0)
169 printf(" (local to host %s)", homehost);
170 printf("\n");
171 atime = __le64_to_cpu(sb->ctime) & 0xFFFFFFFFFFULL;
172 printf(" Creation Time : %.24s\n", ctime(&atime));
173 c=map_num(pers, __le32_to_cpu(sb->level));
174 printf(" Raid Level : %s\n", c?c:"-unknown-");
175 printf(" Raid Devices : %d\n", __le32_to_cpu(sb->raid_disks));
176 printf("\n");
177 printf(" Device Size : %llu%s\n", (unsigned long long)sb->data_size, human_size(sb->data_size<<9));
178 if (__le32_to_cpu(sb->level) >= 0) {
179 int ddsks=0;
180 switch(__le32_to_cpu(sb->level)) {
181 case 1: ddsks=1;break;
182 case 4:
183 case 5: ddsks = __le32_to_cpu(sb->raid_disks)-1; break;
184 case 6: ddsks = __le32_to_cpu(sb->raid_disks)-2; break;
185 case 10:
186 layout = __le32_to_cpu(sb->layout);
187 ddsks = __le32_to_cpu(sb->raid_disks)
188 / (layout&255) / ((layout>>8)&255);
189 }
190 if (ddsks)
191 printf(" Array Size : %llu%s\n",
192 ddsks*(unsigned long long)__le64_to_cpu(sb->size),
193 human_size(ddsks*__le64_to_cpu(sb->size)<<9));
194 if (sb->size != sb->data_size)
195 printf(" Used Size : %llu%s\n",
196 (unsigned long long)__le64_to_cpu(sb->size),
197 human_size(__le64_to_cpu(sb->size)<<9));
198 }
199 if (sb->data_offset)
200 printf(" Data Offset : %llu sectors\n",
201 (unsigned long long)__le64_to_cpu(sb->data_offset));
202 printf(" Super Offset : %llu sectors\n",
203 (unsigned long long)__le64_to_cpu(sb->super_offset));
204 if (__le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET)
205 printf("Recovery Offset : %llu sectors\n", (unsigned long long)__le64_to_cpu(sb->recovery_offset));
206 printf(" State : %s\n", (__le64_to_cpu(sb->resync_offset)+1)? "active":"clean");
207 printf(" Device UUID : ");
208 for (i=0; i<16; i++) {
209 if ((i&3)==0 && i != 0) printf(":");
210 printf("%02x", sb->device_uuid[i]);
211 }
212 printf("\n");
213 printf("\n");
214 if (sb->feature_map & __cpu_to_le32(MD_FEATURE_BITMAP_OFFSET)) {
215 printf("Internal Bitmap : %ld sectors from superblock\n",
216 (long)__le32_to_cpu(sb->bitmap_offset));
217 }
218 if (sb->feature_map & __le32_to_cpu(MD_FEATURE_RESHAPE_ACTIVE)) {
219 printf(" Reshape pos'n : %llu%s\n", (unsigned long long)__le64_to_cpu(sb->reshape_position)/2,
220 human_size(__le64_to_cpu(sb->reshape_position)<<9));
221 if (__le32_to_cpu(sb->delta_disks)) {
222 printf(" Delta Devices : %d", __le32_to_cpu(sb->delta_disks));
223 if (__le32_to_cpu(sb->delta_disks))
224 printf(" (%d->%d)\n",
225 __le32_to_cpu(sb->raid_disks)-__le32_to_cpu(sb->delta_disks),
226 __le32_to_cpu(sb->raid_disks));
227 else
228 printf(" (%d->%d)\n", __le32_to_cpu(sb->raid_disks),
229 __le32_to_cpu(sb->raid_disks)+__le32_to_cpu(sb->delta_disks));
230 }
231 if (__le32_to_cpu(sb->new_level) != __le32_to_cpu(sb->level)) {
232 c = map_num(pers, __le32_to_cpu(sb->new_level));
233 printf(" New Level : %s\n", c?c:"-unknown-");
234 }
235 if (__le32_to_cpu(sb->new_layout) != __le32_to_cpu(sb->layout)) {
236 if (__le32_to_cpu(sb->level) == 5) {
237 c = map_num(r5layout, __le32_to_cpu(sb->new_layout));
238 printf(" New Layout : %s\n", c?c:"-unknown-");
239 }
240 if (__le32_to_cpu(sb->level) == 10) {
241 printf(" New Layout : near=%d, %s=%d\n",
242 __le32_to_cpu(sb->new_layout)&255,
243 (__le32_to_cpu(sb->new_layout)&0x10000)?"offset":"far",
244 (__le32_to_cpu(sb->new_layout)>>8)&255);
245 }
246 }
247 if (__le32_to_cpu(sb->new_chunk) != __le32_to_cpu(sb->chunksize))
248 printf(" New Chunksize : %dK\n", __le32_to_cpu(sb->new_chunk)/2);
249 printf("\n");
250 }
251 if (sb->devflags) {
252 printf(" Flags :");
253 if (sb->devflags & WriteMostly1)
254 printf(" write-mostly");
255 printf("\n");
256 }
257
258 atime = __le64_to_cpu(sb->utime) & 0xFFFFFFFFFFULL;
259 printf(" Update Time : %.24s\n", ctime(&atime));
260
261 if (calc_sb_1_csum(sb) == sb->sb_csum)
262 printf(" Checksum : %x - correct\n", __le32_to_cpu(sb->sb_csum));
263 else
264 printf(" Checksum : %x - expected %x\n", __le32_to_cpu(sb->sb_csum),
265 __le32_to_cpu(calc_sb_1_csum(sb)));
266 printf(" Events : %llu\n", (unsigned long long)__le64_to_cpu(sb->events));
267 printf("\n");
268 if (__le32_to_cpu(sb->level) == 5) {
269 c = map_num(r5layout, __le32_to_cpu(sb->layout));
270 printf(" Layout : %s\n", c?c:"-unknown-");
271 }
272 if (__le32_to_cpu(sb->level) == 10) {
273 int lo = __le32_to_cpu(sb->layout);
274 printf(" Layout : near=%d, %s=%d\n",
275 lo&255,
276 (lo&0x10000)?"offset":"far",
277 (lo>>8)&255);
278 }
279 switch(__le32_to_cpu(sb->level)) {
280 case 0:
281 case 4:
282 case 5:
283 case 6:
284 case 10:
285 printf(" Chunk Size : %dK\n", __le32_to_cpu(sb->chunksize)/2);
286 break;
287 case -1:
288 printf(" Rounding : %dK\n", __le32_to_cpu(sb->chunksize)/2);
289 break;
290 default: break;
291 }
292 printf("\n");
293 printf(" Array Slot : %d (", __le32_to_cpu(sb->dev_number));
294 for (i= __le32_to_cpu(sb->max_dev); i> 0 ; i--)
295 if (__le16_to_cpu(sb->dev_roles[i-1]) != 0xffff)
296 break;
297 for (d=0; d < i; d++) {
298 int role = __le16_to_cpu(sb->dev_roles[d]);
299 if (d) printf(", ");
300 if (role == 0xffff) printf("empty");
301 else if(role == 0xfffe) printf("failed");
302 else printf("%d", role);
303 }
304 printf(")\n");
305 printf(" Array State : ");
306 for (d=0; d<__le32_to_cpu(sb->raid_disks); d++) {
307 int cnt = 0;
308 int me = 0;
309 int i;
310 for (i=0; i< __le32_to_cpu(sb->max_dev); i++) {
311 int role = __le16_to_cpu(sb->dev_roles[i]);
312 if (role == d) {
313 if (i == __le32_to_cpu(sb->dev_number))
314 me = 1;
315 cnt++;
316 }
317 }
318 if (cnt > 1) printf("?");
319 else if (cnt == 1 && me) printf("U");
320 else if (cnt == 1) printf("u");
321 else printf ("_");
322 }
323 faulty = 0;
324 for (i=0; i< __le32_to_cpu(sb->max_dev); i++) {
325 int role = __le16_to_cpu(sb->dev_roles[i]);
326 if (role == 0xFFFE)
327 faulty++;
328 }
329 if (faulty) printf(" %d failed", faulty);
330 printf("\n");
331 }
332
333
334 static void brief_examine_super1(void *sbv)
335 {
336 struct mdp_superblock_1 *sb = sbv;
337 int i;
338 char *nm;
339 char *c=map_num(pers, __le32_to_cpu(sb->level));
340
341 nm = strchr(sb->set_name, ':');
342 if (nm)
343 nm++;
344 else if (sb->set_name[0])
345 nm = sb->set_name;
346 else
347 nm = "??";
348
349 printf("ARRAY /dev/md/%s level=%s metadata=1 num-devices=%d UUID=",
350 nm,
351 c?c:"-unknown-", __le32_to_cpu(sb->raid_disks));
352 for (i=0; i<16; i++) {
353 if ((i&3)==0 && i != 0) printf(":");
354 printf("%02x", sb->set_uuid[i]);
355 }
356 if (sb->set_name[0])
357 printf(" name=%.32s", sb->set_name);
358 printf("\n");
359 }
360
361 static void detail_super1(void *sbv, char *homehost)
362 {
363 struct mdp_superblock_1 *sb = sbv;
364 int i;
365 int l = homehost ? strlen(homehost) : 0;
366
367 printf(" Name : %.32s", sb->set_name);
368 if (l > 0 && l < 32 &&
369 sb->set_name[l] == ':' &&
370 strncmp(sb->set_name, homehost, l) == 0)
371 printf(" (local to host %s)", homehost);
372 printf("\n UUID : ");
373 for (i=0; i<16; i++) {
374 if ((i&3)==0 && i != 0) printf(":");
375 printf("%02x", sb->set_uuid[i]);
376 }
377 printf("\n Events : %llu\n\n", (unsigned long long)__le64_to_cpu(sb->events));
378 }
379
380 static void brief_detail_super1(void *sbv)
381 {
382 struct mdp_superblock_1 *sb = sbv;
383 int i;
384
385 if (sb->set_name[0])
386 printf(" name=%.32s", sb->set_name);
387 printf(" UUID=");
388 for (i=0; i<16; i++) {
389 if ((i&3)==0 && i != 0) printf(":");
390 printf("%02x", sb->set_uuid[i]);
391 }
392 }
393
394 #endif
395
396 static int match_home1(void *sbv, char *homehost)
397 {
398 struct mdp_superblock_1 *sb = sbv;
399 int l = homehost ? strlen(homehost) : 0;
400
401 return (l > 0 && l < 32 &&
402 sb->set_name[l] == ':' &&
403 strncmp(sb->set_name, homehost, l) == 0);
404 }
405
406 static void uuid_from_super1(int uuid[4], void * sbv)
407 {
408 struct mdp_superblock_1 *super = sbv;
409 char *cuuid = (char*)uuid;
410 int i;
411 for (i=0; i<16; i++)
412 cuuid[i] = super->set_uuid[i];
413 }
414
415 static void getinfo_super1(struct mdinfo *info, void *sbv)
416 {
417 struct mdp_superblock_1 *sb = sbv;
418 int working = 0;
419 int i;
420 int role;
421
422 info->array.major_version = 1;
423 info->array.minor_version = __le32_to_cpu(sb->feature_map);
424 info->array.patch_version = 0;
425 info->array.raid_disks = __le32_to_cpu(sb->raid_disks);
426 info->array.level = __le32_to_cpu(sb->level);
427 info->array.layout = __le32_to_cpu(sb->layout);
428 info->array.md_minor = -1;
429 info->array.ctime = __le64_to_cpu(sb->ctime);
430 info->array.utime = __le64_to_cpu(sb->utime);
431 info->array.chunk_size = __le32_to_cpu(sb->chunksize)*512;
432
433 info->data_offset = __le64_to_cpu(sb->data_offset);
434 info->component_size = __le64_to_cpu(sb->size);
435
436 info->disk.major = 0;
437 info->disk.minor = 0;
438 info->disk.number = __le32_to_cpu(sb->dev_number);
439 if (__le32_to_cpu(sb->dev_number) >= __le32_to_cpu(sb->max_dev) ||
440 __le32_to_cpu(sb->max_dev) > 512)
441 role = 0xfffe;
442 else
443 role = __le16_to_cpu(sb->dev_roles[__le32_to_cpu(sb->dev_number)]);
444
445 info->disk.raid_disk = -1;
446 switch(role) {
447 case 0xFFFF:
448 info->disk.state = 2; /* spare: ACTIVE, not sync, not faulty */
449 break;
450 case 0xFFFE:
451 info->disk.state = 1; /* faulty */
452 break;
453 default:
454 info->disk.state = 6; /* active and in sync */
455 info->disk.raid_disk = role;
456 }
457 info->events = __le64_to_cpu(sb->events);
458
459 memcpy(info->uuid, sb->set_uuid, 16);
460
461 strncpy(info->name, sb->set_name, 32);
462 info->name[32] = 0;
463
464 if (sb->feature_map & __le32_to_cpu(MD_FEATURE_RESHAPE_ACTIVE)) {
465 info->reshape_active = 1;
466 info->reshape_progress = __le64_to_cpu(sb->reshape_position);
467 info->new_level = __le32_to_cpu(sb->new_level);
468 info->delta_disks = __le32_to_cpu(sb->delta_disks);
469 info->new_layout = __le32_to_cpu(sb->new_layout);
470 info->new_chunk = __le32_to_cpu(sb->new_chunk)<<9;
471 } else
472 info->reshape_active = 0;
473
474 for (i=0; i< __le32_to_cpu(sb->max_dev); i++) {
475 role = __le16_to_cpu(sb->dev_roles[i]);
476 if (/*role == 0xFFFF || */role < info->array.raid_disks)
477 working++;
478 }
479
480 info->array.working_disks = working;
481 }
482
483 static int update_super1(struct mdinfo *info, void *sbv, char *update,
484 char *devname, int verbose,
485 int uuid_set, char *homehost)
486 {
487 /* NOTE: for 'assemble' and 'force' we need to return non-zero if any change was made.
488 * For others, the return value is ignored.
489 */
490 int rv = 0;
491 struct mdp_superblock_1 *sb = sbv;
492
493 if (strcmp(update, "force-one")==0) {
494 /* Not enough devices for a working array,
495 * so bring this one up-to-date
496 */
497 if (sb->events != __cpu_to_le64(info->events))
498 rv = 1;
499 sb->events = __cpu_to_le64(info->events);
500 }
501 if (strcmp(update, "force-array")==0) {
502 /* Degraded array and 'force' requests to
503 * maybe need to mark it 'clean'.
504 */
505 switch(__le32_to_cpu(sb->level)) {
506 case 5: case 4: case 6:
507 /* need to force clean */
508 if (sb->resync_offset != ~0ULL)
509 rv = 1;
510 sb->resync_offset = ~0ULL;
511 }
512 }
513 if (strcmp(update, "assemble")==0) {
514 int d = info->disk.number;
515 int want;
516 if (info->disk.state == 6)
517 want = __cpu_to_le32(info->disk.raid_disk);
518 else
519 want = 0xFFFF;
520 if (sb->dev_roles[d] != want) {
521 sb->dev_roles[d] = want;
522 rv = 1;
523 }
524 }
525 if (strcmp(update, "grow") == 0) {
526 sb->raid_disks = __cpu_to_le32(info->array.raid_disks);
527 /* FIXME */
528 }
529 if (strcmp(update, "resync") == 0) {
530 /* make sure resync happens */
531 sb->resync_offset = 0ULL;
532 }
533 if (strcmp(update, "uuid") == 0) {
534 memcpy(sb->set_uuid, info->uuid, 16);
535 if (__le32_to_cpu(sb->feature_map)&MD_FEATURE_BITMAP_OFFSET) {
536 struct bitmap_super_s *bm;
537 bm = (struct bitmap_super_s*)(sbv+1024);
538 memcpy(bm->uuid, info->uuid, 16);
539 }
540 }
541 if (strcmp(update, "homehost") == 0 &&
542 homehost) {
543 char *c;
544 update = "name";
545 c = strchr(sb->set_name, ':');
546 if (c)
547 strncpy(info->name, c+1, 31 - (c-sb->set_name));
548 else
549 strncpy(info->name, sb->set_name, 32);
550 info->name[32] = 0;
551 }
552 if (strcmp(update, "name") == 0) {
553 if (info->name[0] == 0)
554 sprintf(info->name, "%d", info->array.md_minor);
555 memset(sb->set_name, 0, sizeof(sb->set_name));
556 if (homehost &&
557 strchr(info->name, ':') == NULL &&
558 strlen(homehost)+1+strlen(info->name) < 32) {
559 strcpy(sb->set_name, homehost);
560 strcat(sb->set_name, ":");
561 strcat(sb->set_name, info->name);
562 } else
563 strcpy(sb->set_name, info->name);
564 }
565 if (strcmp(update, "devicesize") == 0 &&
566 __le64_to_cpu(sb->super_offset) <
567 __le64_to_cpu(sb->data_offset)) {
568 /* set data_size to device size less data_offset */
569 struct misc_dev_info *misc = (struct misc_dev_info*)
570 (sbv + 1024 + sizeof(struct bitmap_super_s));
571 printf("Size was %llu\n", __le64_to_cpu(sb->data_size));
572 sb->data_size = __cpu_to_le64(
573 misc->device_size - __le64_to_cpu(sb->data_offset));
574 printf("Size is %llu\n", __le64_to_cpu(sb->data_size));
575 }
576 if (strcmp(update, "_reshape_progress")==0)
577 sb->reshape_position = __cpu_to_le64(info->reshape_progress);
578
579 sb->sb_csum = calc_sb_1_csum(sb);
580 return rv;
581 }
582
583 static int init_super1(struct supertype *st, void **sbp, mdu_array_info_t *info,
584 unsigned long long size, char *name, char *homehost)
585 {
586 struct mdp_superblock_1 *sb = malloc(1024 + sizeof(bitmap_super_t) +
587 sizeof(struct misc_dev_info));
588 int spares;
589 int rfd;
590 char defname[10];
591 memset(sb, 0, 1024);
592
593 if (info->major_version == -1) {
594 /* zeroing superblock */
595 *sbp = sb;
596 return 0;
597 }
598
599 spares = info->working_disks - info->active_disks;
600 if (info->raid_disks + spares > 384) {
601 fprintf(stderr, Name ": too many devices requested: %d+%d > %d\n",
602 info->raid_disks , spares, 384);
603 return 0;
604 }
605
606 sb->magic = __cpu_to_le32(MD_SB_MAGIC);
607 sb->major_version = __cpu_to_le32(1);
608 sb->feature_map = 0;
609 sb->pad0 = 0;
610
611 if ((rfd = open("/dev/urandom", O_RDONLY)) < 0 ||
612 read(rfd, sb->set_uuid, 16) != 16) {
613 *(__u32*)(sb->set_uuid) = random();
614 *(__u32*)(sb->set_uuid+4) = random();
615 *(__u32*)(sb->set_uuid+8) = random();
616 *(__u32*)(sb->set_uuid+12) = random();
617 }
618 if (rfd >= 0) close(rfd);
619
620 if (name == NULL || *name == 0) {
621 sprintf(defname, "%d", info->md_minor);
622 name = defname;
623 }
624 memset(sb->set_name, 0, 32);
625 if (homehost &&
626 strchr(name, ':')== NULL &&
627 strlen(homehost)+1+strlen(name) < 32) {
628 strcpy(sb->set_name, homehost);
629 strcat(sb->set_name, ":");
630 strcat(sb->set_name, name);
631 } else
632 strcpy(sb->set_name, name);
633
634 sb->ctime = __cpu_to_le64((unsigned long long)time(0));
635 sb->level = __cpu_to_le32(info->level);
636 sb->layout = __cpu_to_le32(info->layout);
637 sb->size = __cpu_to_le64(size*2ULL);
638 sb->chunksize = __cpu_to_le32(info->chunk_size>>9);
639 sb->raid_disks = __cpu_to_le32(info->raid_disks);
640
641 sb->data_offset = __cpu_to_le64(0);
642 sb->data_size = __cpu_to_le64(0);
643 sb->super_offset = __cpu_to_le64(0);
644 sb->recovery_offset = __cpu_to_le64(0);
645
646 sb->utime = sb->ctime;
647 sb->events = __cpu_to_le64(1);
648 if (info->state & (1<<MD_SB_CLEAN))
649 sb->resync_offset = ~0ULL;
650 else
651 sb->resync_offset = 0;
652 sb->max_dev = __cpu_to_le32((1024- sizeof(struct mdp_superblock_1))/
653 sizeof(sb->dev_roles[0]));
654 memset(sb->pad3, 0, sizeof(sb->pad3));
655
656 memset(sb->dev_roles, 0xff, 1024 - sizeof(struct mdp_superblock_1));
657
658 *sbp = sb;
659 return 1;
660 }
661
662 /* Add a device to the superblock being created */
663 static void add_to_super1(void *sbv, mdu_disk_info_t *dk)
664 {
665 struct mdp_superblock_1 *sb = sbv;
666 __u16 *rp = sb->dev_roles + dk->number;
667 if ((dk->state & 6) == 6) /* active, sync */
668 *rp = __cpu_to_le16(dk->raid_disk);
669 else if ((dk->state & ~2) == 0) /* active or idle -> spare */
670 *rp = 0xffff;
671 else
672 *rp = 0xfffe;
673 }
674
675 static void locate_bitmap1(struct supertype *st, int fd, void *sbv);
676
677 static int store_super1(struct supertype *st, int fd, void *sbv)
678 {
679 struct mdp_superblock_1 *sb = sbv;
680 unsigned long long sb_offset;
681 int sbsize;
682 unsigned long size;
683 unsigned long long dsize;
684
685 #ifdef BLKGETSIZE64
686 if (ioctl(fd, BLKGETSIZE64, &dsize) != 0)
687 #endif
688 {
689 if (ioctl(fd, BLKGETSIZE, &size))
690 return 1;
691 else
692 dsize = (unsigned long long)size;
693 } else
694 dsize >>= 9;
695
696 if (dsize < 24)
697 return 2;
698
699 /*
700 * Calculate the position of the superblock.
701 * It is always aligned to a 4K boundary and
702 * depending on minor_version, it can be:
703 * 0: At least 8K, but less than 12K, from end of device
704 * 1: At start of device
705 * 2: 4K from start of device.
706 */
707 switch(st->minor_version) {
708 case 0:
709 sb_offset = dsize;
710 sb_offset -= 8*2;
711 sb_offset &= ~(4*2-1);
712 break;
713 case 1:
714 sb_offset = 0;
715 break;
716 case 2:
717 sb_offset = 4*2;
718 break;
719 default:
720 return -EINVAL;
721 }
722
723
724
725 if (sb_offset != __le64_to_cpu(sb->super_offset) &&
726 0 != __le64_to_cpu(sb->super_offset)
727 ) {
728 fprintf(stderr, Name ": internal error - sb_offset is wrong\n");
729 abort();
730 }
731
732 if (lseek64(fd, sb_offset << 9, 0)< 0LL)
733 return 3;
734
735 sbsize = sizeof(*sb) + 2 * __le32_to_cpu(sb->max_dev);
736
737 if (write(fd, sb, sbsize) != sbsize)
738 return 4;
739
740 if (sb->feature_map & __cpu_to_le32(MD_FEATURE_BITMAP_OFFSET)) {
741 struct bitmap_super_s *bm = (struct bitmap_super_s*)
742 (((char*)sb)+1024);
743 if (__le32_to_cpu(bm->magic) == BITMAP_MAGIC) {
744 locate_bitmap1(st, fd, sbv);
745 if (write(fd, bm, sizeof(*bm)) != sizeof(*bm))
746 return 5;
747 }
748 }
749 fsync(fd);
750 return 0;
751 }
752
753 static int load_super1(struct supertype *st, int fd, void **sbp, char *devname);
754
755 static int write_init_super1(struct supertype *st, void *sbv,
756 mdu_disk_info_t *dinfo, char *devname)
757 {
758 struct mdp_superblock_1 *sb = sbv;
759 void *refsbv = NULL;
760 int fd = open(devname, O_RDWR | O_EXCL);
761 int rfd;
762 int rv;
763 int bm_space;
764
765 unsigned long space;
766 unsigned long long dsize, array_size;
767 long long sb_offset;
768
769
770 if (fd < 0) {
771 fprintf(stderr, Name ": Failed to open %s to write superblock\n",
772 devname);
773 return -1;
774 }
775
776 sb->dev_number = __cpu_to_le32(dinfo->number);
777 if (dinfo->state & (1<<MD_DISK_WRITEMOSTLY))
778 sb->devflags |= __cpu_to_le32(WriteMostly1);
779
780 if ((rfd = open("/dev/urandom", O_RDONLY)) < 0 ||
781 read(rfd, sb->device_uuid, 16) != 16) {
782 *(__u32*)(sb->device_uuid) = random();
783 *(__u32*)(sb->device_uuid+4) = random();
784 *(__u32*)(sb->device_uuid+8) = random();
785 *(__u32*)(sb->device_uuid+12) = random();
786 }
787 if (rfd >= 0) close(rfd);
788 sb->events = 0;
789
790 if (load_super1(st, fd, &refsbv, NULL)==0) {
791 struct mdp_superblock_1 *refsb = refsbv;
792
793 memcpy(sb->device_uuid, refsb->device_uuid, 16);
794 if (memcmp(sb->set_uuid, refsb->set_uuid, 16)==0) {
795 /* same array, so preserve events and dev_number */
796 sb->events = refsb->events;
797 /* bugs in 2.6.17 and earlier mean the dev_number
798 * chosen in Manage must be preserved
799 */
800 if (get_linux_version() >= 2006018)
801 sb->dev_number = refsb->dev_number;
802 }
803 free(refsb);
804 }
805
806 #ifdef BLKGETSIZE64
807 if (ioctl(fd, BLKGETSIZE64, &dsize) != 0)
808 #endif
809 {
810 unsigned long size;
811 if (ioctl(fd, BLKGETSIZE, &size))
812 return 1;
813 else
814 dsize = size;
815 } else
816 dsize >>= 9;
817
818 if (dsize < 24) {
819 close(fd);
820 return 2;
821 }
822
823
824 /*
825 * Calculate the position of the superblock.
826 * It is always aligned to a 4K boundary and
827 * depending on minor_version, it can be:
828 * 0: At least 8K, but less than 12K, from end of device
829 * 1: At start of device
830 * 2: 4K from start of device.
831 * Depending on the array size, we might leave extra space
832 * for a bitmap.
833 */
834 array_size = __le64_to_cpu(sb->size);
835 /* work out how much space we left of a bitmap */
836 if (array_size >= 200*1024*1024*2)
837 bm_space = 128*2;
838 else if (array_size > 8*1024*1024*2)
839 bm_space = 64*2;
840 else
841 bm_space = 0;
842
843 switch(st->minor_version) {
844 case 0:
845 sb_offset = dsize;
846 sb_offset -= 8*2;
847 sb_offset &= ~(4*2-1);
848 sb->super_offset = __cpu_to_le64(sb_offset);
849 sb->data_offset = __cpu_to_le64(0);
850 sb->data_size = __cpu_to_le64(sb_offset - bm_space);
851 break;
852 case 1:
853 sb->super_offset = __cpu_to_le64(0);
854 sb->data_offset = __cpu_to_le64(bm_space + 4*2);
855 sb->data_size = __cpu_to_le64(dsize - bm_space - 4*2);
856 break;
857 case 2:
858 sb_offset = 4*2;
859 if (dsize - 4*2 - 64*2 >= array_size && array_size > 8*1024*1024*2)
860 space = 64*2;
861 else
862 space = 4*2;
863 sb->super_offset = __cpu_to_le64(4*2);
864 sb->data_offset = __cpu_to_le64(4*2 + 4*2 + bm_space);
865 sb->data_size = __cpu_to_le64(dsize - 4*2 - 4*2 - bm_space );
866 break;
867 default:
868 return -EINVAL;
869 }
870
871
872 sb->sb_csum = calc_sb_1_csum(sb);
873 rv = store_super1(st, fd, sb);
874 if (rv)
875 fprintf(stderr, Name ": failed to write superblock to %s\n", devname);
876
877 if (rv == 0 && (__le32_to_cpu(sb->feature_map) & 1))
878 rv = st->ss->write_bitmap(st, fd, sbv);
879 close(fd);
880 return rv;
881 }
882
883 static int compare_super1(void **firstp, void *secondv)
884 {
885 /*
886 * return:
887 * 0 same, or first was empty, and second was copied
888 * 1 second had wrong number
889 * 2 wrong uuid
890 * 3 wrong other info
891 */
892 struct mdp_superblock_1 *first = *firstp;
893 struct mdp_superblock_1 *second = secondv;
894
895 if (second->magic != __cpu_to_le32(MD_SB_MAGIC))
896 return 1;
897 if (second->major_version != __cpu_to_le32(1))
898 return 1;
899
900 if (!first) {
901 first = malloc(1024+sizeof(bitmap_super_t) +
902 sizeof(struct misc_dev_info));
903 memcpy(first, second, 1024+sizeof(bitmap_super_t) +
904 sizeof(struct misc_dev_info));
905 *firstp = first;
906 return 0;
907 }
908 if (memcmp(first->set_uuid, second->set_uuid, 16)!= 0)
909 return 2;
910
911 if (first->ctime != second->ctime ||
912 first->level != second->level ||
913 first->layout != second->layout ||
914 first->size != second->size ||
915 first->chunksize != second->chunksize ||
916 first->raid_disks != second->raid_disks)
917 return 3;
918 return 0;
919 }
920
921 static int load_super1(struct supertype *st, int fd, void **sbp, char *devname)
922 {
923 unsigned long size;
924 unsigned long long dsize;
925 unsigned long long sb_offset;
926 struct mdp_superblock_1 *super;
927 int uuid[4];
928 struct bitmap_super_s *bsb;
929 struct misc_dev_info *misc;
930
931
932 if (st->ss == NULL) {
933 int bestvers = -1;
934 __u64 bestctime = 0;
935 /* guess... choose latest ctime */
936 st->ss = &super1;
937 for (st->minor_version = 0; st->minor_version <= 2 ; st->minor_version++) {
938 switch(load_super1(st, fd, sbp, devname)) {
939 case 0: super = *sbp;
940 if (bestvers == -1 ||
941 bestctime < __le64_to_cpu(super->ctime)) {
942 bestvers = st->minor_version;
943 bestctime = __le64_to_cpu(super->ctime);
944 }
945 free(super);
946 *sbp = NULL;
947 break;
948 case 1: st->ss = NULL; return 1; /*bad device */
949 case 2: break; /* bad, try next */
950 }
951 }
952 if (bestvers != -1) {
953 int rv;
954 st->minor_version = bestvers;
955 st->ss = &super1;
956 st->max_devs = 384;
957 rv = load_super1(st, fd, sbp, devname);
958 if (rv) st->ss = NULL;
959 return rv;
960 }
961 st->ss = NULL;
962 return 2;
963 }
964 #ifdef BLKGETSIZE64
965 if (ioctl(fd, BLKGETSIZE64, &dsize) != 0)
966 #endif
967 {
968 if (ioctl(fd, BLKGETSIZE, &size)) {
969 if (devname)
970 fprintf(stderr, Name ": cannot find device size for %s: %s\n",
971 devname, strerror(errno));
972 return 1;
973 }
974 dsize = size;
975 } else
976 dsize >>= 9;
977
978 if (dsize < 24) {
979 if (devname)
980 fprintf(stderr, Name ": %s is too small for md: size is %llu sectors.\n",
981 devname, dsize);
982 return 1;
983 }
984
985 /*
986 * Calculate the position of the superblock.
987 * It is always aligned to a 4K boundary and
988 * depending on minor_version, it can be:
989 * 0: At least 8K, but less than 12K, from end of device
990 * 1: At start of device
991 * 2: 4K from start of device.
992 */
993 switch(st->minor_version) {
994 case 0:
995 sb_offset = dsize;
996 sb_offset -= 8*2;
997 sb_offset &= ~(4*2-1);
998 break;
999 case 1:
1000 sb_offset = 0;
1001 break;
1002 case 2:
1003 sb_offset = 4*2;
1004 break;
1005 default:
1006 return -EINVAL;
1007 }
1008
1009 ioctl(fd, BLKFLSBUF, 0); /* make sure we read current data */
1010
1011
1012 if (lseek64(fd, sb_offset << 9, 0)< 0LL) {
1013 if (devname)
1014 fprintf(stderr, Name ": Cannot seek to superblock on %s: %s\n",
1015 devname, strerror(errno));
1016 return 1;
1017 }
1018
1019 super = malloc(1024 + sizeof(bitmap_super_t) +
1020 sizeof(struct misc_dev_info));
1021
1022 if (read(fd, super, 1024) != 1024) {
1023 if (devname)
1024 fprintf(stderr, Name ": Cannot read superblock on %s\n",
1025 devname);
1026 free(super);
1027 return 1;
1028 }
1029
1030 if (__le32_to_cpu(super->magic) != MD_SB_MAGIC) {
1031 if (devname)
1032 fprintf(stderr, Name ": No super block found on %s (Expected magic %08x, got %08x)\n",
1033 devname, MD_SB_MAGIC, __le32_to_cpu(super->magic));
1034 free(super);
1035 return 2;
1036 }
1037
1038 if (__le32_to_cpu(super->major_version) != 1) {
1039 if (devname)
1040 fprintf(stderr, Name ": Cannot interpret superblock on %s - version is %d\n",
1041 devname, __le32_to_cpu(super->major_version));
1042 free(super);
1043 return 2;
1044 }
1045 if (__le64_to_cpu(super->super_offset) != sb_offset) {
1046 if (devname)
1047 fprintf(stderr, Name ": No superblock found on %s (super_offset is wrong)\n",
1048 devname);
1049 free(super);
1050 return 2;
1051 }
1052 *sbp = super;
1053
1054 bsb = (struct bitmap_super_s *)(((char*)super)+1024);
1055
1056 misc = (struct misc_dev_info*) (bsb+1);
1057 misc->device_size = dsize;
1058
1059 /* Now check on the bitmap superblock */
1060 if ((__le32_to_cpu(super->feature_map)&MD_FEATURE_BITMAP_OFFSET) == 0)
1061 return 0;
1062 /* Read the bitmap superblock and make sure it looks
1063 * valid. If it doesn't clear the bit. An --assemble --force
1064 * should get that written out.
1065 */
1066 locate_bitmap1(st, fd, super);
1067 if (read(fd, ((char*)super)+1024, sizeof(struct bitmap_super_s))
1068 != sizeof(struct bitmap_super_s))
1069 goto no_bitmap;
1070
1071 uuid_from_super1(uuid, super);
1072 if (__le32_to_cpu(bsb->magic) != BITMAP_MAGIC ||
1073 memcmp(bsb->uuid, uuid, 16) != 0)
1074 goto no_bitmap;
1075 return 0;
1076
1077 no_bitmap:
1078 super->feature_map = __cpu_to_le32(__le32_to_cpu(super->feature_map) & ~1);
1079 return 0;
1080 }
1081
1082
1083 static struct supertype *match_metadata_desc1(char *arg)
1084 {
1085 struct supertype *st = malloc(sizeof(*st));
1086 if (!st) return st;
1087
1088 st->ss = &super1;
1089 st->max_devs = 384;
1090 if (strcmp(arg, "1") == 0 ||
1091 strcmp(arg, "1.0") == 0 ||
1092 strcmp(arg, "default/large") == 0) {
1093 st->minor_version = 0;
1094 return st;
1095 }
1096 if (strcmp(arg, "1.1") == 0) {
1097 st->minor_version = 1;
1098 return st;
1099 }
1100 if (strcmp(arg, "1.2") == 0) {
1101 st->minor_version = 2;
1102 return st;
1103 }
1104
1105 free(st);
1106 return NULL;
1107 }
1108
1109 /* find available size on device with this devsize, using
1110 * superblock type st, and reserving 'reserve' sectors for
1111 * a possible bitmap
1112 */
1113 static __u64 avail_size1(struct supertype *st, __u64 devsize)
1114 {
1115 if (devsize < 24)
1116 return 0;
1117
1118 /* if the device is bigger than 8Gig, save 64k for bitmap usage,
1119 * if bigger than 200Gig, save 128k
1120 */
1121 if (devsize-64*2 >= 200*1024*1024*2)
1122 devsize -= 128*2;
1123 else if (devsize >= 8*1024*1024*2)
1124 devsize -= 64*2;
1125
1126 switch(st->minor_version) {
1127 case 0:
1128 /* at end */
1129 return ((devsize - 8*2 ) & ~(4*2-1));
1130 case 1:
1131 /* at start, 4K for superblock and possible bitmap */
1132 return devsize - 4*2;
1133 case 2:
1134 /* 4k from start, 4K for superblock and possible bitmap */
1135 return devsize - (4+4)*2;
1136 }
1137 return 0;
1138 }
1139
1140 static int
1141 add_internal_bitmap1(struct supertype *st, void *sbv,
1142 int *chunkp, int delay, int write_behind,
1143 unsigned long long size,
1144 int may_change, int major)
1145 {
1146 /*
1147 * If not may_change, then this is a 'Grow', and the bitmap
1148 * must fit after the superblock.
1149 * If may_change, then this is create, and we can put the bitmap
1150 * before the superblock if we like, or may move the start.
1151 * If !may_change, the bitmap MUST live at offset of 1K, until
1152 * we get a sysfs interface.
1153 *
1154 * size is in sectors, chunk is in bytes !!!
1155 */
1156
1157 unsigned long long bits;
1158 unsigned long long max_bits;
1159 unsigned long long min_chunk;
1160 long offset;
1161 int chunk = *chunkp;
1162 int room;
1163 struct mdp_superblock_1 *sb = sbv;
1164 bitmap_super_t *bms = (bitmap_super_t*)(((char*)sb) + 1024);
1165
1166 switch(st->minor_version) {
1167 case 0:
1168 /* either 3K after the superblock, or some amount of space
1169 * before.
1170 */
1171 if (may_change) {
1172 /* We are creating array, so we *know* how much room has
1173 * been left.
1174 */
1175 offset = 0;
1176 if (__le64_to_cpu(sb->size) >= 200*1024*1024*2)
1177 room = 128*2;
1178 else if (__le64_to_cpu(sb->size) > 8*1024*1024*2)
1179 room = 64*2;
1180 else {
1181 room = 3*2;
1182 offset = 2;
1183 }
1184 } else {
1185 room = __le64_to_cpu(sb->super_offset)
1186 - __le64_to_cpu(sb->data_offset)
1187 - __le64_to_cpu(sb->data_size);
1188 /* remove '1 ||' when we can set offset via sysfs */
1189 if (1 || (room < 3*2 &&
1190 __le32_to_cpu(sb->max_dev) <= 384)) {
1191 room = 3*2;
1192 offset = 1*2;
1193 } else {
1194 offset = 0; /* means movable offset */
1195 }
1196 }
1197 break;
1198 case 1:
1199 case 2: /* between superblock and data */
1200 if (may_change) {
1201 offset = 4*2;
1202 if (__le64_to_cpu(sb->size) >= 200*1024*1024*2)
1203 room = 128*2;
1204 else if (__le64_to_cpu(sb->size) > 8*1024*1024*2)
1205 room = 64*2;
1206 else
1207 room = 3*2;
1208 } else {
1209 room = __le64_to_cpu(sb->data_offset)
1210 - __le64_to_cpu(sb->super_offset);
1211 if (1 || __le32_to_cpu(sb->max_dev) <= 384) {
1212 room -= 2;
1213 offset = 2;
1214 } else {
1215 room -= 4*2;
1216 offset = 4*2;
1217 }
1218 }
1219 break;
1220 }
1221
1222 if (chunk == UnSet && room > 128*2)
1223 /* Limit to 128K of bitmap when chunk size not requested */
1224 room = 128*2;
1225
1226 max_bits = (room * 512 - sizeof(bitmap_super_t)) * 8;
1227
1228 min_chunk = 4096; /* sub-page chunks don't work yet.. */
1229 bits = (size*512)/min_chunk +1;
1230 while (bits > max_bits) {
1231 min_chunk *= 2;
1232 bits = (bits+1)/2;
1233 }
1234 if (chunk == UnSet)
1235 chunk = min_chunk;
1236 else if (chunk < min_chunk)
1237 return 0; /* chunk size too small */
1238 if (chunk == 0) /* rounding problem */
1239 return 0;
1240
1241 if (offset == 0) {
1242 bits = (size*512) / chunk + 1;
1243 room = ((bits+7)/8 + sizeof(bitmap_super_t) +511)/512;
1244 offset = -room;
1245 }
1246
1247 sb->bitmap_offset = __cpu_to_le32(offset);
1248
1249 sb->feature_map = __cpu_to_le32(__le32_to_cpu(sb->feature_map) | 1);
1250 memset(bms, 0, sizeof(*bms));
1251 bms->magic = __cpu_to_le32(BITMAP_MAGIC);
1252 bms->version = __cpu_to_le32(major);
1253 uuid_from_super1((int*)bms->uuid, sb);
1254 bms->chunksize = __cpu_to_le32(chunk);
1255 bms->daemon_sleep = __cpu_to_le32(delay);
1256 bms->sync_size = __cpu_to_le64(size);
1257 bms->write_behind = __cpu_to_le32(write_behind);
1258
1259 *chunkp = chunk;
1260 return 1;
1261 }
1262
1263
1264 static void locate_bitmap1(struct supertype *st, int fd, void *sbv)
1265 {
1266 unsigned long long offset;
1267 struct mdp_superblock_1 *sb;
1268 int mustfree = 0;
1269
1270 if (!sbv) {
1271 if (st->ss->load_super(st, fd, &sbv, NULL))
1272 return; /* no error I hope... */
1273 mustfree = 1;
1274 }
1275 sb = sbv;
1276
1277 offset = __le64_to_cpu(sb->super_offset);
1278 offset += (long) __le32_to_cpu(sb->bitmap_offset);
1279 if (mustfree)
1280 free(sb);
1281 lseek64(fd, offset<<9, 0);
1282 }
1283
1284 static int write_bitmap1(struct supertype *st, int fd, void *sbv)
1285 {
1286 struct mdp_superblock_1 *sb = sbv;
1287 bitmap_super_t *bms = (bitmap_super_t*)(((char*)sb)+1024);
1288 int rv = 0;
1289
1290 int towrite, n;
1291 char buf[4096];
1292
1293 locate_bitmap1(st, fd, sbv);
1294
1295 if (write(fd, ((char*)sb)+1024, sizeof(bitmap_super_t)) !=
1296 sizeof(bitmap_super_t))
1297 return -2;
1298 towrite = __le64_to_cpu(bms->sync_size) / (__le32_to_cpu(bms->chunksize)>>9);
1299 towrite = (towrite+7) >> 3; /* bits to bytes */
1300 memset(buf, 0xff, sizeof(buf));
1301 while (towrite > 0) {
1302 n = towrite;
1303 if (n > sizeof(buf))
1304 n = sizeof(buf);
1305 n = write(fd, buf, n);
1306 if (n > 0)
1307 towrite -= n;
1308 else
1309 break;
1310 }
1311 fsync(fd);
1312 if (towrite)
1313 rv = -2;
1314
1315 return rv;
1316 }
1317
1318 struct superswitch super1 = {
1319 #ifndef MDASSEMBLE
1320 .examine_super = examine_super1,
1321 .brief_examine_super = brief_examine_super1,
1322 .detail_super = detail_super1,
1323 .brief_detail_super = brief_detail_super1,
1324 #endif
1325 .match_home = match_home1,
1326 .uuid_from_super = uuid_from_super1,
1327 .getinfo_super = getinfo_super1,
1328 .update_super = update_super1,
1329 .init_super = init_super1,
1330 .add_to_super = add_to_super1,
1331 .store_super = store_super1,
1332 .write_init_super = write_init_super1,
1333 .compare_super = compare_super1,
1334 .load_super = load_super1,
1335 .match_metadata_desc = match_metadata_desc1,
1336 .avail_size = avail_size1,
1337 .add_internal_bitmap = add_internal_bitmap1,
1338 .locate_bitmap = locate_bitmap1,
1339 .write_bitmap = write_bitmap1,
1340 .major = 1,
1341 #if __BYTE_ORDER == BIG_ENDIAN
1342 .swapuuid = 0,
1343 #else
1344 .swapuuid = 1,
1345 #endif
1346 };
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