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[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(struct supertype *st, char *homehost)
146 {
147 struct mdp_superblock_1 *sb = st->sb;
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 unsigned long long sb_offset;
156
157 printf(" Magic : %08x\n", __le32_to_cpu(sb->magic));
158 printf(" Version : 1");
159 sb_offset = __le64_to_cpu(sb->super_offset);
160 if (sb_offset <= 4)
161 printf(".1\n");
162 else if (sb_offset <= 8)
163 printf(".2\n");
164 else
165 printf(".0\n");
166 printf(" Feature Map : 0x%x\n", __le32_to_cpu(sb->feature_map));
167 printf(" Array UUID : ");
168 for (i=0; i<16; i++) {
169 if ((i&3)==0 && i != 0) printf(":");
170 printf("%02x", sb->set_uuid[i]);
171 }
172 printf("\n");
173 printf(" Name : %.32s", sb->set_name);
174 if (l > 0 && l < 32 &&
175 sb->set_name[l] == ':' &&
176 strncmp(sb->set_name, homehost, l) == 0)
177 printf(" (local to host %s)", homehost);
178 printf("\n");
179 atime = __le64_to_cpu(sb->ctime) & 0xFFFFFFFFFFULL;
180 printf(" Creation Time : %.24s\n", ctime(&atime));
181 c=map_num(pers, __le32_to_cpu(sb->level));
182 printf(" Raid Level : %s\n", c?c:"-unknown-");
183 printf(" Raid Devices : %d\n", __le32_to_cpu(sb->raid_disks));
184 printf("\n");
185 printf(" Avail Dev Size : %llu%s\n",
186 (unsigned long long)__le64_to_cpu(sb->data_size),
187 human_size(__le64_to_cpu(sb->data_size)<<9));
188 if (__le32_to_cpu(sb->level) >= 0) {
189 int ddsks=0;
190 switch(__le32_to_cpu(sb->level)) {
191 case 1: ddsks=1;break;
192 case 4:
193 case 5: ddsks = __le32_to_cpu(sb->raid_disks)-1; break;
194 case 6: ddsks = __le32_to_cpu(sb->raid_disks)-2; break;
195 case 10:
196 layout = __le32_to_cpu(sb->layout);
197 ddsks = __le32_to_cpu(sb->raid_disks)
198 / (layout&255) / ((layout>>8)&255);
199 }
200 if (ddsks)
201 printf(" Array Size : %llu%s\n",
202 ddsks*(unsigned long long)__le64_to_cpu(sb->size),
203 human_size(ddsks*__le64_to_cpu(sb->size)<<9));
204 if (sb->size != sb->data_size)
205 printf(" Used Dev Size : %llu%s\n",
206 (unsigned long long)__le64_to_cpu(sb->size),
207 human_size(__le64_to_cpu(sb->size)<<9));
208 }
209 if (sb->data_offset)
210 printf(" Data Offset : %llu sectors\n",
211 (unsigned long long)__le64_to_cpu(sb->data_offset));
212 printf(" Super Offset : %llu sectors\n",
213 (unsigned long long)__le64_to_cpu(sb->super_offset));
214 if (__le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET)
215 printf("Recovery Offset : %llu sectors\n", (unsigned long long)__le64_to_cpu(sb->recovery_offset));
216 printf(" State : %s\n", (__le64_to_cpu(sb->resync_offset)+1)? "active":"clean");
217 printf(" Device UUID : ");
218 for (i=0; i<16; i++) {
219 if ((i&3)==0 && i != 0) printf(":");
220 printf("%02x", sb->device_uuid[i]);
221 }
222 printf("\n");
223 printf("\n");
224 if (sb->feature_map & __cpu_to_le32(MD_FEATURE_BITMAP_OFFSET)) {
225 printf("Internal Bitmap : %ld sectors from superblock\n",
226 (long)(int32_t)__le32_to_cpu(sb->bitmap_offset));
227 }
228 if (sb->feature_map & __le32_to_cpu(MD_FEATURE_RESHAPE_ACTIVE)) {
229 printf(" Reshape pos'n : %llu%s\n", (unsigned long long)__le64_to_cpu(sb->reshape_position)/2,
230 human_size(__le64_to_cpu(sb->reshape_position)<<9));
231 if (__le32_to_cpu(sb->delta_disks)) {
232 printf(" Delta Devices : %d", __le32_to_cpu(sb->delta_disks));
233 if (__le32_to_cpu(sb->delta_disks))
234 printf(" (%d->%d)\n",
235 __le32_to_cpu(sb->raid_disks)-__le32_to_cpu(sb->delta_disks),
236 __le32_to_cpu(sb->raid_disks));
237 else
238 printf(" (%d->%d)\n", __le32_to_cpu(sb->raid_disks),
239 __le32_to_cpu(sb->raid_disks)+__le32_to_cpu(sb->delta_disks));
240 }
241 if (__le32_to_cpu(sb->new_level) != __le32_to_cpu(sb->level)) {
242 c = map_num(pers, __le32_to_cpu(sb->new_level));
243 printf(" New Level : %s\n", c?c:"-unknown-");
244 }
245 if (__le32_to_cpu(sb->new_layout) != __le32_to_cpu(sb->layout)) {
246 if (__le32_to_cpu(sb->level) == 5) {
247 c = map_num(r5layout, __le32_to_cpu(sb->new_layout));
248 printf(" New Layout : %s\n", c?c:"-unknown-");
249 }
250 if (__le32_to_cpu(sb->level) == 10) {
251 printf(" New Layout : near=%d, %s=%d\n",
252 __le32_to_cpu(sb->new_layout)&255,
253 (__le32_to_cpu(sb->new_layout)&0x10000)?"offset":"far",
254 (__le32_to_cpu(sb->new_layout)>>8)&255);
255 }
256 }
257 if (__le32_to_cpu(sb->new_chunk) != __le32_to_cpu(sb->chunksize))
258 printf(" New Chunksize : %dK\n", __le32_to_cpu(sb->new_chunk)/2);
259 printf("\n");
260 }
261 if (sb->devflags) {
262 printf(" Flags :");
263 if (sb->devflags & WriteMostly1)
264 printf(" write-mostly");
265 printf("\n");
266 }
267
268 atime = __le64_to_cpu(sb->utime) & 0xFFFFFFFFFFULL;
269 printf(" Update Time : %.24s\n", ctime(&atime));
270
271 if (calc_sb_1_csum(sb) == sb->sb_csum)
272 printf(" Checksum : %x - correct\n", __le32_to_cpu(sb->sb_csum));
273 else
274 printf(" Checksum : %x - expected %x\n", __le32_to_cpu(sb->sb_csum),
275 __le32_to_cpu(calc_sb_1_csum(sb)));
276 printf(" Events : %llu\n", (unsigned long long)__le64_to_cpu(sb->events));
277 printf("\n");
278 if (__le32_to_cpu(sb->level) == 5) {
279 c = map_num(r5layout, __le32_to_cpu(sb->layout));
280 printf(" Layout : %s\n", c?c:"-unknown-");
281 }
282 if (__le32_to_cpu(sb->level) == 10) {
283 int lo = __le32_to_cpu(sb->layout);
284 printf(" Layout : near=%d, %s=%d\n",
285 lo&255,
286 (lo&0x10000)?"offset":"far",
287 (lo>>8)&255);
288 }
289 switch(__le32_to_cpu(sb->level)) {
290 case 0:
291 case 4:
292 case 5:
293 case 6:
294 case 10:
295 printf(" Chunk Size : %dK\n", __le32_to_cpu(sb->chunksize)/2);
296 break;
297 case -1:
298 printf(" Rounding : %dK\n", __le32_to_cpu(sb->chunksize)/2);
299 break;
300 default: break;
301 }
302 printf("\n");
303 printf(" Array Slot : %d (", __le32_to_cpu(sb->dev_number));
304 for (i= __le32_to_cpu(sb->max_dev); i> 0 ; i--)
305 if (__le16_to_cpu(sb->dev_roles[i-1]) != 0xffff)
306 break;
307 for (d=0; d < i; d++) {
308 int role = __le16_to_cpu(sb->dev_roles[d]);
309 if (d) printf(", ");
310 if (role == 0xffff) printf("empty");
311 else if(role == 0xfffe) printf("failed");
312 else printf("%d", role);
313 }
314 printf(")\n");
315 printf(" Array State : ");
316 for (d=0; d<__le32_to_cpu(sb->raid_disks); d++) {
317 int cnt = 0;
318 int me = 0;
319 int i;
320 for (i=0; i< __le32_to_cpu(sb->max_dev); i++) {
321 int role = __le16_to_cpu(sb->dev_roles[i]);
322 if (role == d) {
323 if (i == __le32_to_cpu(sb->dev_number))
324 me = 1;
325 cnt++;
326 }
327 }
328 if (cnt > 1) printf("?");
329 else if (cnt == 1 && me) printf("U");
330 else if (cnt == 1) printf("u");
331 else printf ("_");
332 }
333 faulty = 0;
334 for (i=0; i< __le32_to_cpu(sb->max_dev); i++) {
335 int role = __le16_to_cpu(sb->dev_roles[i]);
336 if (role == 0xFFFE)
337 faulty++;
338 }
339 if (faulty) printf(" %d failed", faulty);
340 printf("\n");
341 }
342
343
344 static void brief_examine_super1(struct supertype *st)
345 {
346 struct mdp_superblock_1 *sb = st->sb;
347 int i;
348 unsigned long long sb_offset;
349 char *nm;
350 char *c=map_num(pers, __le32_to_cpu(sb->level));
351
352 nm = strchr(sb->set_name, ':');
353 if (nm)
354 nm++;
355 else if (sb->set_name[0])
356 nm = sb->set_name;
357 else
358 nm = "??";
359
360 printf("ARRAY /dev/md/%s level=%s ", nm, c?c:"-unknown-");
361 sb_offset = __le64_to_cpu(sb->super_offset);
362 if (sb_offset <= 4)
363 printf("metadata=1.1 ");
364 else if (sb_offset <= 8)
365 printf("metadata=1.2 ");
366 else
367 printf("metadata=1.0 ");
368 printf("num-devices=%d UUID=", __le32_to_cpu(sb->raid_disks));
369 for (i=0; i<16; i++) {
370 if ((i&3)==0 && i != 0) printf(":");
371 printf("%02x", sb->set_uuid[i]);
372 }
373 if (sb->set_name[0])
374 printf(" name=%.32s", sb->set_name);
375 printf("\n");
376 }
377
378 static void detail_super1(struct supertype *st, char *homehost)
379 {
380 struct mdp_superblock_1 *sb = st->sb;
381 int i;
382 int l = homehost ? strlen(homehost) : 0;
383
384 printf(" Name : %.32s", sb->set_name);
385 if (l > 0 && l < 32 &&
386 sb->set_name[l] == ':' &&
387 strncmp(sb->set_name, homehost, l) == 0)
388 printf(" (local to host %s)", homehost);
389 printf("\n UUID : ");
390 for (i=0; i<16; i++) {
391 if ((i&3)==0 && i != 0) printf(":");
392 printf("%02x", sb->set_uuid[i]);
393 }
394 printf("\n Events : %llu\n\n", (unsigned long long)__le64_to_cpu(sb->events));
395 }
396
397 static void brief_detail_super1(struct supertype *st)
398 {
399 struct mdp_superblock_1 *sb = st->sb;
400 int i;
401
402 if (sb->set_name[0])
403 printf(" name=%.32s", sb->set_name);
404 printf(" UUID=");
405 for (i=0; i<16; i++) {
406 if ((i&3)==0 && i != 0) printf(":");
407 printf("%02x", sb->set_uuid[i]);
408 }
409 }
410
411 static void export_super1(struct supertype *st)
412 {
413 struct mdp_superblock_1 *sb = st->sb;
414 int i;
415 int len = 32;
416
417 for (i=0; i<32; i++)
418 if (sb->set_name[i] == '\n' ||
419 sb->set_name[i] == '\0') {
420 len = i;
421 break;
422 }
423 if (len)
424 printf("MD_NAME=%.*s\n", len, sb->set_name);
425 printf("MD_UUID=");
426 for (i=0; i<16; i++) {
427 if ((i&3)==0 && i != 0) printf(":");
428 printf("%02x", sb->set_uuid[i]);
429 }
430 printf("\n");
431 }
432
433 #endif
434
435 static int match_home1(struct supertype *st, char *homehost)
436 {
437 struct mdp_superblock_1 *sb = st->sb;
438 int l = homehost ? strlen(homehost) : 0;
439
440 return (l > 0 && l < 32 &&
441 sb->set_name[l] == ':' &&
442 strncmp(sb->set_name, homehost, l) == 0);
443 }
444
445 static void uuid_from_super1(struct supertype *st, int uuid[4])
446 {
447 struct mdp_superblock_1 *super = st->sb;
448 char *cuuid = (char*)uuid;
449 int i;
450 for (i=0; i<16; i++)
451 cuuid[i] = super->set_uuid[i];
452 }
453
454 static void getinfo_super1(struct supertype *st, struct mdinfo *info)
455 {
456 struct mdp_superblock_1 *sb = st->sb;
457 int working = 0;
458 int i;
459 int role;
460
461 info->array.major_version = 1;
462 info->array.minor_version = __le32_to_cpu(sb->feature_map);
463 info->array.patch_version = 0;
464 info->array.raid_disks = __le32_to_cpu(sb->raid_disks);
465 info->array.level = __le32_to_cpu(sb->level);
466 info->array.layout = __le32_to_cpu(sb->layout);
467 info->array.md_minor = -1;
468 info->array.ctime = __le64_to_cpu(sb->ctime);
469 info->array.utime = __le64_to_cpu(sb->utime);
470 info->array.chunk_size = __le32_to_cpu(sb->chunksize)*512;
471 info->array.state =
472 (__le64_to_cpu(sb->resync_offset) >= __le64_to_cpu(sb->size))
473 ? 1 : 0;
474
475 info->data_offset = __le64_to_cpu(sb->data_offset);
476 info->component_size = __le64_to_cpu(sb->size);
477
478 info->disk.major = 0;
479 info->disk.minor = 0;
480 info->disk.number = __le32_to_cpu(sb->dev_number);
481 if (__le32_to_cpu(sb->dev_number) >= __le32_to_cpu(sb->max_dev) ||
482 __le32_to_cpu(sb->max_dev) > 512)
483 role = 0xfffe;
484 else
485 role = __le16_to_cpu(sb->dev_roles[__le32_to_cpu(sb->dev_number)]);
486
487 info->disk.raid_disk = -1;
488 switch(role) {
489 case 0xFFFF:
490 info->disk.state = 2; /* spare: ACTIVE, not sync, not faulty */
491 break;
492 case 0xFFFE:
493 info->disk.state = 1; /* faulty */
494 break;
495 default:
496 info->disk.state = 6; /* active and in sync */
497 info->disk.raid_disk = role;
498 }
499 info->events = __le64_to_cpu(sb->events);
500
501 memcpy(info->uuid, sb->set_uuid, 16);
502
503 strncpy(info->name, sb->set_name, 32);
504 info->name[32] = 0;
505
506 if (sb->feature_map & __le32_to_cpu(MD_FEATURE_RESHAPE_ACTIVE)) {
507 info->reshape_active = 1;
508 info->reshape_progress = __le64_to_cpu(sb->reshape_position);
509 info->new_level = __le32_to_cpu(sb->new_level);
510 info->delta_disks = __le32_to_cpu(sb->delta_disks);
511 info->new_layout = __le32_to_cpu(sb->new_layout);
512 info->new_chunk = __le32_to_cpu(sb->new_chunk)<<9;
513 } else
514 info->reshape_active = 0;
515
516 for (i=0; i< __le32_to_cpu(sb->max_dev); i++) {
517 role = __le16_to_cpu(sb->dev_roles[i]);
518 if (/*role == 0xFFFF || */role < info->array.raid_disks)
519 working++;
520 }
521
522 info->array.working_disks = working;
523 }
524
525 static int update_super1(struct supertype *st, struct mdinfo *info,
526 char *update,
527 char *devname, int verbose,
528 int uuid_set, char *homehost)
529 {
530 /* NOTE: for 'assemble' and 'force' we need to return non-zero if any change was made.
531 * For others, the return value is ignored.
532 */
533 int rv = 0;
534 struct mdp_superblock_1 *sb = st->sb;
535
536 if (strcmp(update, "force-one")==0) {
537 /* Not enough devices for a working array,
538 * so bring this one up-to-date
539 */
540 if (sb->events != __cpu_to_le64(info->events))
541 rv = 1;
542 sb->events = __cpu_to_le64(info->events);
543 }
544 if (strcmp(update, "force-array")==0) {
545 /* Degraded array and 'force' requests to
546 * maybe need to mark it 'clean'.
547 */
548 switch(__le32_to_cpu(sb->level)) {
549 case 5: case 4: case 6:
550 /* need to force clean */
551 if (sb->resync_offset != ~0ULL)
552 rv = 1;
553 sb->resync_offset = ~0ULL;
554 }
555 }
556 if (strcmp(update, "assemble")==0) {
557 int d = info->disk.number;
558 int want;
559 if (info->disk.state == 6)
560 want = __cpu_to_le32(info->disk.raid_disk);
561 else
562 want = 0xFFFF;
563 if (sb->dev_roles[d] != want) {
564 sb->dev_roles[d] = want;
565 rv = 1;
566 }
567 }
568 if (strcmp(update, "linear-grow-new") == 0) {
569 int i;
570 int rfd;
571 int max = __le32_to_cpu(sb->max_dev);
572
573 for (i=0 ; i < max ; i++)
574 if (__le16_to_cpu(sb->dev_roles[i]) >= 0xfffe)
575 break;
576 sb->dev_number = __cpu_to_le32(i);
577 info->disk.number = i;
578 if (max >= __le32_to_cpu(sb->max_dev))
579 sb->max_dev = __cpu_to_le32(max+1);
580
581 if ((rfd = open("/dev/urandom", O_RDONLY)) < 0 ||
582 read(rfd, sb->device_uuid, 16) != 16) {
583 *(__u32*)(sb->device_uuid) = random();
584 *(__u32*)(sb->device_uuid+4) = random();
585 *(__u32*)(sb->device_uuid+8) = random();
586 *(__u32*)(sb->device_uuid+12) = random();
587 }
588
589 sb->dev_roles[i] =
590 __cpu_to_le16(info->disk.raid_disk);
591 }
592 if (strcmp(update, "linear-grow-update") == 0) {
593 sb->raid_disks = __cpu_to_le32(info->array.raid_disks);
594 sb->dev_roles[info->disk.number] =
595 __cpu_to_le16(info->disk.raid_disk);
596 }
597 if (strcmp(update, "resync") == 0) {
598 /* make sure resync happens */
599 sb->resync_offset = 0ULL;
600 }
601 if (strcmp(update, "uuid") == 0) {
602 copy_uuid(sb->set_uuid, info->uuid, super1.swapuuid);
603
604 if (__le32_to_cpu(sb->feature_map)&MD_FEATURE_BITMAP_OFFSET) {
605 struct bitmap_super_s *bm;
606 bm = (struct bitmap_super_s*)(st->sb+1024);
607 memcpy(bm->uuid, sb->set_uuid, 16);
608 }
609 }
610 if (strcmp(update, "homehost") == 0 &&
611 homehost) {
612 char *c;
613 update = "name";
614 c = strchr(sb->set_name, ':');
615 if (c)
616 strncpy(info->name, c+1, 31 - (c-sb->set_name));
617 else
618 strncpy(info->name, sb->set_name, 32);
619 info->name[32] = 0;
620 }
621 if (strcmp(update, "name") == 0) {
622 if (info->name[0] == 0)
623 sprintf(info->name, "%d", info->array.md_minor);
624 memset(sb->set_name, 0, sizeof(sb->set_name));
625 if (homehost &&
626 strchr(info->name, ':') == NULL &&
627 strlen(homehost)+1+strlen(info->name) < 32) {
628 strcpy(sb->set_name, homehost);
629 strcat(sb->set_name, ":");
630 strcat(sb->set_name, info->name);
631 } else
632 strcpy(sb->set_name, info->name);
633 }
634 if (strcmp(update, "devicesize") == 0 &&
635 __le64_to_cpu(sb->super_offset) <
636 __le64_to_cpu(sb->data_offset)) {
637 /* set data_size to device size less data_offset */
638 struct misc_dev_info *misc = (struct misc_dev_info*)
639 (st->sb + 1024 + sizeof(struct bitmap_super_s));
640 printf("Size was %llu\n", (unsigned long long)
641 __le64_to_cpu(sb->data_size));
642 sb->data_size = __cpu_to_le64(
643 misc->device_size - __le64_to_cpu(sb->data_offset));
644 printf("Size is %llu\n", (unsigned long long)
645 __le64_to_cpu(sb->data_size));
646 }
647 if (strcmp(update, "_reshape_progress")==0)
648 sb->reshape_position = __cpu_to_le64(info->reshape_progress);
649
650 sb->sb_csum = calc_sb_1_csum(sb);
651 return rv;
652 }
653
654 static int init_super1(struct supertype *st, mdu_array_info_t *info,
655 unsigned long long size, char *name, char *homehost, int *uuid)
656 {
657 struct mdp_superblock_1 *sb = malloc(1024 + sizeof(bitmap_super_t) +
658 sizeof(struct misc_dev_info));
659 int spares;
660 int rfd;
661 char defname[10];
662 memset(sb, 0, 1024);
663
664 st->sb = sb;
665 if (info->major_version == -1) {
666 /* zeroing superblock */
667 return 0;
668 }
669
670 spares = info->working_disks - info->active_disks;
671 if (info->raid_disks + spares > 384) {
672 fprintf(stderr, Name ": too many devices requested: %d+%d > %d\n",
673 info->raid_disks , spares, 384);
674 return 0;
675 }
676
677 sb->magic = __cpu_to_le32(MD_SB_MAGIC);
678 sb->major_version = __cpu_to_le32(1);
679 sb->feature_map = 0;
680 sb->pad0 = 0;
681
682 if (uuid)
683 copy_uuid(sb->set_uuid, uuid, super1.swapuuid);
684 else {
685 if ((rfd = open("/dev/urandom", O_RDONLY)) < 0 ||
686 read(rfd, sb->set_uuid, 16) != 16) {
687 *(__u32*)(sb->set_uuid) = random();
688 *(__u32*)(sb->set_uuid+4) = random();
689 *(__u32*)(sb->set_uuid+8) = random();
690 *(__u32*)(sb->set_uuid+12) = random();
691 }
692 if (rfd >= 0) close(rfd);
693 }
694
695 if (name == NULL || *name == 0) {
696 sprintf(defname, "%d", info->md_minor);
697 name = defname;
698 }
699 memset(sb->set_name, 0, 32);
700 if (homehost &&
701 strchr(name, ':')== NULL &&
702 strlen(homehost)+1+strlen(name) < 32) {
703 strcpy(sb->set_name, homehost);
704 strcat(sb->set_name, ":");
705 strcat(sb->set_name, name);
706 } else
707 strcpy(sb->set_name, name);
708
709 sb->ctime = __cpu_to_le64((unsigned long long)time(0));
710 sb->level = __cpu_to_le32(info->level);
711 sb->layout = __cpu_to_le32(info->layout);
712 sb->size = __cpu_to_le64(size*2ULL);
713 sb->chunksize = __cpu_to_le32(info->chunk_size>>9);
714 sb->raid_disks = __cpu_to_le32(info->raid_disks);
715
716 sb->data_offset = __cpu_to_le64(0);
717 sb->data_size = __cpu_to_le64(0);
718 sb->super_offset = __cpu_to_le64(0);
719 sb->recovery_offset = __cpu_to_le64(0);
720
721 sb->utime = sb->ctime;
722 sb->events = __cpu_to_le64(1);
723 if (info->state & (1<<MD_SB_CLEAN))
724 sb->resync_offset = ~0ULL;
725 else
726 sb->resync_offset = 0;
727 sb->max_dev = __cpu_to_le32((1024- sizeof(struct mdp_superblock_1))/
728 sizeof(sb->dev_roles[0]));
729 memset(sb->pad3, 0, sizeof(sb->pad3));
730
731 memset(sb->dev_roles, 0xff, 1024 - sizeof(struct mdp_superblock_1));
732
733 return 1;
734 }
735
736 /* Add a device to the superblock being created */
737 static void add_to_super1(struct supertype *st, mdu_disk_info_t *dk)
738 {
739 struct mdp_superblock_1 *sb = st->sb;
740 __u16 *rp = sb->dev_roles + dk->number;
741 if ((dk->state & 6) == 6) /* active, sync */
742 *rp = __cpu_to_le16(dk->raid_disk);
743 else if ((dk->state & ~2) == 0) /* active or idle -> spare */
744 *rp = 0xffff;
745 else
746 *rp = 0xfffe;
747 }
748
749 static void locate_bitmap1(struct supertype *st, int fd);
750
751 static int store_super1(struct supertype *st, int fd)
752 {
753 struct mdp_superblock_1 *sb = st->sb;
754 unsigned long long sb_offset;
755 int sbsize;
756 unsigned long long dsize;
757
758 if (!get_dev_size(fd, NULL, &dsize))
759 return 1;
760
761 dsize >>= 9;
762
763 if (dsize < 24)
764 return 2;
765
766 /*
767 * Calculate the position of the superblock.
768 * It is always aligned to a 4K boundary and
769 * depending on minor_version, it can be:
770 * 0: At least 8K, but less than 12K, from end of device
771 * 1: At start of device
772 * 2: 4K from start of device.
773 */
774 switch(st->minor_version) {
775 case 0:
776 sb_offset = dsize;
777 sb_offset -= 8*2;
778 sb_offset &= ~(4*2-1);
779 break;
780 case 1:
781 sb_offset = 0;
782 break;
783 case 2:
784 sb_offset = 4*2;
785 break;
786 default:
787 return -EINVAL;
788 }
789
790
791
792 if (sb_offset != __le64_to_cpu(sb->super_offset) &&
793 0 != __le64_to_cpu(sb->super_offset)
794 ) {
795 fprintf(stderr, Name ": internal error - sb_offset is wrong\n");
796 abort();
797 }
798
799 if (lseek64(fd, sb_offset << 9, 0)< 0LL)
800 return 3;
801
802 sbsize = sizeof(*sb) + 2 * __le32_to_cpu(sb->max_dev);
803
804 if (write(fd, sb, sbsize) != sbsize)
805 return 4;
806
807 if (sb->feature_map & __cpu_to_le32(MD_FEATURE_BITMAP_OFFSET)) {
808 struct bitmap_super_s *bm = (struct bitmap_super_s*)
809 (((char*)sb)+1024);
810 if (__le32_to_cpu(bm->magic) == BITMAP_MAGIC) {
811 locate_bitmap1(st, fd);
812 if (write(fd, bm, sizeof(*bm)) != sizeof(*bm))
813 return 5;
814 }
815 }
816 fsync(fd);
817 return 0;
818 }
819
820 static int load_super1(struct supertype *st, int fd, char *devname);
821
822 static unsigned long choose_bm_space(unsigned long devsize)
823 {
824 /* if the device is bigger than 8Gig, save 64k for bitmap usage,
825 * if bigger than 200Gig, save 128k
826 */
827 if (devsize < 64*2) return 0;
828 if (devsize - 64*2 >= 200*1024*1024*2)
829 return 128*2;
830 if (devsize - 4*2 > 8*1024*1024*2)
831 return 64*2;
832 return 4*2;
833 }
834
835 static int write_init_super1(struct supertype *st,
836 mdu_disk_info_t *dinfo, char *devname)
837 {
838 struct mdp_superblock_1 *sb = st->sb;
839 struct supertype refst;
840 int fd = open(devname, O_RDWR | O_EXCL);
841 int rfd;
842 int rv;
843 int bm_space;
844
845 unsigned long long dsize, array_size;
846 long long sb_offset;
847
848
849 if (fd < 0) {
850 fprintf(stderr, Name ": Failed to open %s to write superblock\n",
851 devname);
852 return -1;
853 }
854
855 sb->dev_number = __cpu_to_le32(dinfo->number);
856 if (dinfo->state & (1<<MD_DISK_WRITEMOSTLY))
857 sb->devflags |= __cpu_to_le32(WriteMostly1);
858
859 if ((rfd = open("/dev/urandom", O_RDONLY)) < 0 ||
860 read(rfd, sb->device_uuid, 16) != 16) {
861 *(__u32*)(sb->device_uuid) = random();
862 *(__u32*)(sb->device_uuid+4) = random();
863 *(__u32*)(sb->device_uuid+8) = random();
864 *(__u32*)(sb->device_uuid+12) = random();
865 }
866 if (rfd >= 0) close(rfd);
867 sb->events = 0;
868
869 refst =*st;
870 refst.sb = NULL;
871 if (load_super1(&refst, fd, NULL)==0) {
872 struct mdp_superblock_1 *refsb = refst.sb;
873
874 memcpy(sb->device_uuid, refsb->device_uuid, 16);
875 if (memcmp(sb->set_uuid, refsb->set_uuid, 16)==0) {
876 /* same array, so preserve events and dev_number */
877 sb->events = refsb->events;
878 /* bugs in 2.6.17 and earlier mean the dev_number
879 * chosen in Manage must be preserved
880 */
881 if (get_linux_version() >= 2006018)
882 sb->dev_number = refsb->dev_number;
883 }
884 free(refsb);
885 }
886
887 if (!get_dev_size(fd, NULL, &dsize))
888 return 1;
889 dsize >>= 9;
890
891 if (dsize < 24) {
892 close(fd);
893 return 2;
894 }
895
896
897 /*
898 * Calculate the position of the superblock.
899 * It is always aligned to a 4K boundary and
900 * depending on minor_version, it can be:
901 * 0: At least 8K, but less than 12K, from end of device
902 * 1: At start of device
903 * 2: 4K from start of device.
904 * Depending on the array size, we might leave extra space
905 * for a bitmap.
906 */
907 array_size = __le64_to_cpu(sb->size);
908 /* work out how much space we left for a bitmap */
909 bm_space = choose_bm_space(array_size);
910
911 switch(st->minor_version) {
912 case 0:
913 sb_offset = dsize;
914 sb_offset -= 8*2;
915 sb_offset &= ~(4*2-1);
916 sb->super_offset = __cpu_to_le64(sb_offset);
917 sb->data_offset = __cpu_to_le64(0);
918 if (sb_offset - bm_space < array_size)
919 bm_space = sb_offset - array_size;
920 sb->data_size = __cpu_to_le64(sb_offset - bm_space);
921 break;
922 case 1:
923 sb->super_offset = __cpu_to_le64(0);
924 if (4*2 + bm_space + __le64_to_cpu(sb->size) > dsize)
925 bm_space = dsize - __le64_to_cpu(sb->size) - 4*2;
926 sb->data_offset = __cpu_to_le64(bm_space + 4*2);
927 sb->data_size = __cpu_to_le64(dsize - bm_space - 4*2);
928 break;
929 case 2:
930 sb_offset = 4*2;
931 sb->super_offset = __cpu_to_le64(4*2);
932 if (4*2 + 4*2 + bm_space + __le64_to_cpu(sb->size) > dsize)
933 bm_space = dsize - __le64_to_cpu(sb->size) - 4*2 - 4*2;
934 sb->data_offset = __cpu_to_le64(4*2 + 4*2 + bm_space);
935 sb->data_size = __cpu_to_le64(dsize - 4*2 - 4*2 - bm_space );
936 break;
937 default:
938 return -EINVAL;
939 }
940
941
942 sb->sb_csum = calc_sb_1_csum(sb);
943 rv = store_super1(st, fd);
944 if (rv)
945 fprintf(stderr, Name ": failed to write superblock to %s\n", devname);
946
947 if (rv == 0 && (__le32_to_cpu(sb->feature_map) & 1))
948 rv = st->ss->write_bitmap(st, fd);
949 close(fd);
950 return rv;
951 }
952
953 static int compare_super1(struct supertype *st, struct supertype *tst)
954 {
955 /*
956 * return:
957 * 0 same, or first was empty, and second was copied
958 * 1 second had wrong number
959 * 2 wrong uuid
960 * 3 wrong other info
961 */
962 struct mdp_superblock_1 *first = st->sb;
963 struct mdp_superblock_1 *second = tst->sb;
964
965 if (second->magic != __cpu_to_le32(MD_SB_MAGIC))
966 return 1;
967 if (second->major_version != __cpu_to_le32(1))
968 return 1;
969
970 if (!first) {
971 first = malloc(1024+sizeof(bitmap_super_t) +
972 sizeof(struct misc_dev_info));
973 memcpy(first, second, 1024+sizeof(bitmap_super_t) +
974 sizeof(struct misc_dev_info));
975 st->sb = first;
976 return 0;
977 }
978 if (memcmp(first->set_uuid, second->set_uuid, 16)!= 0)
979 return 2;
980
981 if (first->ctime != second->ctime ||
982 first->level != second->level ||
983 first->layout != second->layout ||
984 first->size != second->size ||
985 first->chunksize != second->chunksize ||
986 first->raid_disks != second->raid_disks)
987 return 3;
988 return 0;
989 }
990
991 static void free_super1(struct supertype *st);
992
993 static int load_super1(struct supertype *st, int fd, char *devname)
994 {
995 unsigned long long dsize;
996 unsigned long long sb_offset;
997 struct mdp_superblock_1 *super;
998 int uuid[4];
999 struct bitmap_super_s *bsb;
1000 struct misc_dev_info *misc;
1001
1002 free_super1(st);
1003
1004 if (st->ss == NULL || st->minor_version == -1) {
1005 int bestvers = -1;
1006 struct supertype tst;
1007 __u64 bestctime = 0;
1008 /* guess... choose latest ctime */
1009 tst.ss = &super1;
1010 tst.sb = NULL;
1011 for (tst.minor_version = 0; tst.minor_version <= 2 ; tst.minor_version++) {
1012 switch(load_super1(&tst, fd, devname)) {
1013 case 0: super = tst.sb;
1014 if (bestvers == -1 ||
1015 bestctime < __le64_to_cpu(super->ctime)) {
1016 bestvers = tst.minor_version;
1017 bestctime = __le64_to_cpu(super->ctime);
1018 }
1019 free(super);
1020 tst.sb = NULL;
1021 break;
1022 case 1: return 1; /*bad device */
1023 case 2: break; /* bad, try next */
1024 }
1025 }
1026 if (bestvers != -1) {
1027 int rv;
1028 tst.minor_version = bestvers;
1029 tst.ss = &super1;
1030 tst.max_devs = 384;
1031 rv = load_super1(&tst, fd, devname);
1032 if (rv == 0)
1033 *st = tst;
1034 return rv;
1035 }
1036 return 2;
1037 }
1038 if (!get_dev_size(fd, devname, &dsize))
1039 return 1;
1040 dsize >>= 9;
1041
1042 if (dsize < 24) {
1043 if (devname)
1044 fprintf(stderr, Name ": %s is too small for md: size is %llu sectors.\n",
1045 devname, dsize);
1046 return 1;
1047 }
1048
1049 /*
1050 * Calculate the position of the superblock.
1051 * It is always aligned to a 4K boundary and
1052 * depending on minor_version, it can be:
1053 * 0: At least 8K, but less than 12K, from end of device
1054 * 1: At start of device
1055 * 2: 4K from start of device.
1056 */
1057 switch(st->minor_version) {
1058 case 0:
1059 sb_offset = dsize;
1060 sb_offset -= 8*2;
1061 sb_offset &= ~(4*2-1);
1062 break;
1063 case 1:
1064 sb_offset = 0;
1065 break;
1066 case 2:
1067 sb_offset = 4*2;
1068 break;
1069 default:
1070 return -EINVAL;
1071 }
1072
1073 ioctl(fd, BLKFLSBUF, 0); /* make sure we read current data */
1074
1075
1076 if (lseek64(fd, sb_offset << 9, 0)< 0LL) {
1077 if (devname)
1078 fprintf(stderr, Name ": Cannot seek to superblock on %s: %s\n",
1079 devname, strerror(errno));
1080 return 1;
1081 }
1082
1083 super = malloc(1024 + sizeof(bitmap_super_t) +
1084 sizeof(struct misc_dev_info));
1085
1086 if (read(fd, super, 1024) != 1024) {
1087 if (devname)
1088 fprintf(stderr, Name ": Cannot read superblock on %s\n",
1089 devname);
1090 free(super);
1091 return 1;
1092 }
1093
1094 if (__le32_to_cpu(super->magic) != MD_SB_MAGIC) {
1095 if (devname)
1096 fprintf(stderr, Name ": No super block found on %s (Expected magic %08x, got %08x)\n",
1097 devname, MD_SB_MAGIC, __le32_to_cpu(super->magic));
1098 free(super);
1099 return 2;
1100 }
1101
1102 if (__le32_to_cpu(super->major_version) != 1) {
1103 if (devname)
1104 fprintf(stderr, Name ": Cannot interpret superblock on %s - version is %d\n",
1105 devname, __le32_to_cpu(super->major_version));
1106 free(super);
1107 return 2;
1108 }
1109 if (__le64_to_cpu(super->super_offset) != sb_offset) {
1110 if (devname)
1111 fprintf(stderr, Name ": No superblock found on %s (super_offset is wrong)\n",
1112 devname);
1113 free(super);
1114 return 2;
1115 }
1116 st->sb = super;
1117
1118 bsb = (struct bitmap_super_s *)(((char*)super)+1024);
1119
1120 misc = (struct misc_dev_info*) (bsb+1);
1121 misc->device_size = dsize;
1122
1123 /* Now check on the bitmap superblock */
1124 if ((__le32_to_cpu(super->feature_map)&MD_FEATURE_BITMAP_OFFSET) == 0)
1125 return 0;
1126 /* Read the bitmap superblock and make sure it looks
1127 * valid. If it doesn't clear the bit. An --assemble --force
1128 * should get that written out.
1129 */
1130 locate_bitmap1(st, fd);
1131 if (read(fd, ((char*)super)+1024, sizeof(struct bitmap_super_s))
1132 != sizeof(struct bitmap_super_s))
1133 goto no_bitmap;
1134
1135 uuid_from_super1(st, uuid);
1136 if (__le32_to_cpu(bsb->magic) != BITMAP_MAGIC ||
1137 memcmp(bsb->uuid, uuid, 16) != 0)
1138 goto no_bitmap;
1139 return 0;
1140
1141 no_bitmap:
1142 super->feature_map = __cpu_to_le32(__le32_to_cpu(super->feature_map) & ~1);
1143 return 0;
1144 }
1145
1146
1147 static struct supertype *match_metadata_desc1(char *arg)
1148 {
1149 struct supertype *st = malloc(sizeof(*st));
1150 if (!st) return st;
1151
1152 st->ss = &super1;
1153 st->max_devs = 384;
1154 st->sb = NULL;
1155 if (strcmp(arg, "1.0") == 0) {
1156 st->minor_version = 0;
1157 return st;
1158 }
1159 if (strcmp(arg, "1.1") == 0) {
1160 st->minor_version = 1;
1161 return st;
1162 }
1163 if (strcmp(arg, "1.2") == 0) {
1164 st->minor_version = 2;
1165 return st;
1166 }
1167 if (strcmp(arg, "1") == 0 ||
1168 strcmp(arg, "default/large") == 0) {
1169 st->minor_version = -1;
1170 return st;
1171 }
1172
1173 free(st);
1174 return NULL;
1175 }
1176
1177 /* find available size on device with this devsize, using
1178 * superblock type st, and reserving 'reserve' sectors for
1179 * a possible bitmap
1180 */
1181 static __u64 avail_size1(struct supertype *st, __u64 devsize)
1182 {
1183 if (devsize < 24)
1184 return 0;
1185
1186 devsize -= choose_bm_space(devsize);
1187
1188 switch(st->minor_version) {
1189 case -1: /* no specified. Now time to set default */
1190 st->minor_version = 0;
1191 /* FALL THROUGH */
1192 case 0:
1193 /* at end */
1194 return ((devsize - 8*2 ) & ~(4*2-1));
1195 case 1:
1196 /* at start, 4K for superblock and possible bitmap */
1197 return devsize - 4*2;
1198 case 2:
1199 /* 4k from start, 4K for superblock and possible bitmap */
1200 return devsize - (4+4)*2;
1201 }
1202 return 0;
1203 }
1204
1205 static int
1206 add_internal_bitmap1(struct supertype *st,
1207 int *chunkp, int delay, int write_behind,
1208 unsigned long long size,
1209 int may_change, int major)
1210 {
1211 /*
1212 * If not may_change, then this is a 'Grow', and the bitmap
1213 * must fit after the superblock.
1214 * If may_change, then this is create, and we can put the bitmap
1215 * before the superblock if we like, or may move the start.
1216 * If !may_change, the bitmap MUST live at offset of 1K, until
1217 * we get a sysfs interface.
1218 *
1219 * size is in sectors, chunk is in bytes !!!
1220 */
1221
1222 unsigned long long bits;
1223 unsigned long long max_bits;
1224 unsigned long long min_chunk;
1225 long offset;
1226 int chunk = *chunkp;
1227 int room = 0;
1228 struct mdp_superblock_1 *sb = st->sb;
1229 bitmap_super_t *bms = (bitmap_super_t*)(((char*)sb) + 1024);
1230
1231 switch(st->minor_version) {
1232 case 0:
1233 /* either 3K after the superblock, or some amount of space
1234 * before.
1235 */
1236 if (may_change) {
1237 /* We are creating array, so we *know* how much room has
1238 * been left.
1239 */
1240 offset = 0;
1241 room = choose_bm_space(__le64_to_cpu(sb->size));
1242 if (room == 4*2) {
1243 /* make it 3K after the superblock */
1244 room = 3*2;
1245 offset = 2;
1246 }
1247 } else {
1248 room = __le64_to_cpu(sb->super_offset)
1249 - __le64_to_cpu(sb->data_offset)
1250 - __le64_to_cpu(sb->data_size);
1251 /* remove '1 ||' when we can set offset via sysfs */
1252 if (1 || (room < 3*2 &&
1253 __le32_to_cpu(sb->max_dev) <= 384)) {
1254 room = 3*2;
1255 offset = 1*2;
1256 } else {
1257 offset = 0; /* means movable offset */
1258 }
1259 }
1260 break;
1261 case 1:
1262 case 2: /* between superblock and data */
1263 if (may_change) {
1264 offset = 4*2;
1265 room = choose_bm_space(__le64_to_cpu(sb->size));
1266 } else {
1267 room = __le64_to_cpu(sb->data_offset)
1268 - __le64_to_cpu(sb->super_offset);
1269 if (1 || __le32_to_cpu(sb->max_dev) <= 384) {
1270 room -= 2;
1271 offset = 2;
1272 } else {
1273 room -= 4*2;
1274 offset = 4*2;
1275 }
1276 }
1277 break;
1278 default:
1279 return 0;
1280 }
1281
1282 if (chunk == UnSet && room > 128*2)
1283 /* Limit to 128K of bitmap when chunk size not requested */
1284 room = 128*2;
1285
1286 max_bits = (room * 512 - sizeof(bitmap_super_t)) * 8;
1287
1288 min_chunk = 4096; /* sub-page chunks don't work yet.. */
1289 bits = (size*512)/min_chunk +1;
1290 while (bits > max_bits) {
1291 min_chunk *= 2;
1292 bits = (bits+1)/2;
1293 }
1294 if (chunk == UnSet)
1295 chunk = min_chunk;
1296 else if (chunk < min_chunk)
1297 return 0; /* chunk size too small */
1298 if (chunk == 0) /* rounding problem */
1299 return 0;
1300
1301 if (offset == 0) {
1302 bits = (size*512) / chunk + 1;
1303 room = ((bits+7)/8 + sizeof(bitmap_super_t) +511)/512;
1304 offset = -room;
1305 }
1306
1307 sb->bitmap_offset = __cpu_to_le32(offset);
1308
1309 sb->feature_map = __cpu_to_le32(__le32_to_cpu(sb->feature_map) | 1);
1310 memset(bms, 0, sizeof(*bms));
1311 bms->magic = __cpu_to_le32(BITMAP_MAGIC);
1312 bms->version = __cpu_to_le32(major);
1313 uuid_from_super1(st, (int*)bms->uuid);
1314 bms->chunksize = __cpu_to_le32(chunk);
1315 bms->daemon_sleep = __cpu_to_le32(delay);
1316 bms->sync_size = __cpu_to_le64(size);
1317 bms->write_behind = __cpu_to_le32(write_behind);
1318
1319 *chunkp = chunk;
1320 return 1;
1321 }
1322
1323
1324 static void locate_bitmap1(struct supertype *st, int fd)
1325 {
1326 unsigned long long offset;
1327 struct mdp_superblock_1 *sb;
1328 int mustfree = 0;
1329
1330 if (!st->sb) {
1331 if (st->ss->load_super(st, fd, NULL))
1332 return; /* no error I hope... */
1333 mustfree = 1;
1334 }
1335 sb = st->sb;
1336
1337 offset = __le64_to_cpu(sb->super_offset);
1338 offset += (int32_t) __le32_to_cpu(sb->bitmap_offset);
1339 if (mustfree)
1340 free(sb);
1341 lseek64(fd, offset<<9, 0);
1342 }
1343
1344 static int write_bitmap1(struct supertype *st, int fd)
1345 {
1346 struct mdp_superblock_1 *sb = st->sb;
1347 bitmap_super_t *bms = (bitmap_super_t*)(((char*)sb)+1024);
1348 int rv = 0;
1349
1350 int towrite, n;
1351 char buf[4096];
1352
1353 locate_bitmap1(st, fd);
1354
1355 if (write(fd, ((char*)sb)+1024, sizeof(bitmap_super_t)) !=
1356 sizeof(bitmap_super_t))
1357 return -2;
1358 towrite = __le64_to_cpu(bms->sync_size) / (__le32_to_cpu(bms->chunksize)>>9);
1359 towrite = (towrite+7) >> 3; /* bits to bytes */
1360 memset(buf, 0xff, sizeof(buf));
1361 while (towrite > 0) {
1362 n = towrite;
1363 if (n > sizeof(buf))
1364 n = sizeof(buf);
1365 n = write(fd, buf, n);
1366 if (n > 0)
1367 towrite -= n;
1368 else
1369 break;
1370 }
1371 fsync(fd);
1372 if (towrite)
1373 rv = -2;
1374
1375 return rv;
1376 }
1377
1378 static void free_super1(struct supertype *st)
1379 {
1380 if (st->sb)
1381 free(st->sb);
1382 st->sb = NULL;
1383 }
1384
1385 struct superswitch super1 = {
1386 #ifndef MDASSEMBLE
1387 .examine_super = examine_super1,
1388 .brief_examine_super = brief_examine_super1,
1389 .detail_super = detail_super1,
1390 .brief_detail_super = brief_detail_super1,
1391 .export_super = export_super1,
1392 #endif
1393 .match_home = match_home1,
1394 .uuid_from_super = uuid_from_super1,
1395 .getinfo_super = getinfo_super1,
1396 .update_super = update_super1,
1397 .init_super = init_super1,
1398 .add_to_super = add_to_super1,
1399 .store_super = store_super1,
1400 .write_init_super = write_init_super1,
1401 .compare_super = compare_super1,
1402 .load_super = load_super1,
1403 .match_metadata_desc = match_metadata_desc1,
1404 .avail_size = avail_size1,
1405 .add_internal_bitmap = add_internal_bitmap1,
1406 .locate_bitmap = locate_bitmap1,
1407 .write_bitmap = write_bitmap1,
1408 .free_super = free_super1,
1409 .major = 1,
1410 #if __BYTE_ORDER == BIG_ENDIAN
1411 .swapuuid = 0,
1412 #else
1413 .swapuuid = 1,
1414 #endif
1415 };
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