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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 export_examine_super1(struct supertype *st)
379 {
380 struct mdp_superblock_1 *sb = st->sb;
381 int i;
382 int len = 32;
383
384 printf("MD_LEVEL=%s\n", map_num(pers, __le32_to_cpu(sb->level)));
385 printf("MD_DEVICES=%d\n", __le32_to_cpu(sb->raid_disks));
386 for (i=0; i<32; i++)
387 if (sb->set_name[i] == '\n' ||
388 sb->set_name[i] == '\0') {
389 len = i;
390 break;
391 }
392 if (len)
393 printf("MD_NAME=%.*s\n", len, sb->set_name);
394 printf("MD_UUID=");
395 for (i=0; i<16; i++) {
396 if ((i&3)==0 && i != 0) printf(":");
397 printf("%02x", sb->set_uuid[i]);
398 }
399 printf("\n");
400 printf("MD_UPDATE_TIME=%llu\n",
401 __le64_to_cpu(sb->utime) & 0xFFFFFFFFFFULL);
402 printf("MD_DEV_UUID=");
403 for (i=0; i<16; i++) {
404 if ((i&3)==0 && i != 0) printf(":");
405 printf("%02x", sb->device_uuid[i]);
406 }
407 printf("\n");
408 printf("MD_EVENTS=%llu\n",
409 (unsigned long long)__le64_to_cpu(sb->events));
410 }
411
412 static void detail_super1(struct supertype *st, char *homehost)
413 {
414 struct mdp_superblock_1 *sb = st->sb;
415 int i;
416 int l = homehost ? strlen(homehost) : 0;
417
418 printf(" Name : %.32s", sb->set_name);
419 if (l > 0 && l < 32 &&
420 sb->set_name[l] == ':' &&
421 strncmp(sb->set_name, homehost, l) == 0)
422 printf(" (local to host %s)", homehost);
423 printf("\n UUID : ");
424 for (i=0; i<16; i++) {
425 if ((i&3)==0 && i != 0) printf(":");
426 printf("%02x", sb->set_uuid[i]);
427 }
428 printf("\n Events : %llu\n\n", (unsigned long long)__le64_to_cpu(sb->events));
429 }
430
431 static void brief_detail_super1(struct supertype *st)
432 {
433 struct mdp_superblock_1 *sb = st->sb;
434 int i;
435
436 if (sb->set_name[0])
437 printf(" name=%.32s", sb->set_name);
438 printf(" UUID=");
439 for (i=0; i<16; i++) {
440 if ((i&3)==0 && i != 0) printf(":");
441 printf("%02x", sb->set_uuid[i]);
442 }
443 }
444
445 static void export_detail_super1(struct supertype *st)
446 {
447 struct mdp_superblock_1 *sb = st->sb;
448 int i;
449 int len = 32;
450
451 for (i=0; i<32; i++)
452 if (sb->set_name[i] == '\n' ||
453 sb->set_name[i] == '\0') {
454 len = i;
455 break;
456 }
457 if (len)
458 printf("MD_NAME=%.*s\n", len, sb->set_name);
459 printf("MD_UUID=");
460 for (i=0; i<16; i++) {
461 if ((i&3)==0 && i != 0) printf(":");
462 printf("%02x", sb->set_uuid[i]);
463 }
464 printf("\n");
465 }
466
467 #endif
468
469 static int match_home1(struct supertype *st, char *homehost)
470 {
471 struct mdp_superblock_1 *sb = st->sb;
472 int l = homehost ? strlen(homehost) : 0;
473
474 return (l > 0 && l < 32 &&
475 sb->set_name[l] == ':' &&
476 strncmp(sb->set_name, homehost, l) == 0);
477 }
478
479 static void uuid_from_super1(struct supertype *st, int uuid[4])
480 {
481 struct mdp_superblock_1 *super = st->sb;
482 char *cuuid = (char*)uuid;
483 int i;
484 for (i=0; i<16; i++)
485 cuuid[i] = super->set_uuid[i];
486 }
487
488 static void getinfo_super1(struct supertype *st, struct mdinfo *info)
489 {
490 struct mdp_superblock_1 *sb = st->sb;
491 int working = 0;
492 int i;
493 int role;
494
495 info->array.major_version = 1;
496 info->array.minor_version = st->minor_version;
497 info->array.patch_version = 0;
498 info->array.raid_disks = __le32_to_cpu(sb->raid_disks);
499 info->array.level = __le32_to_cpu(sb->level);
500 info->array.layout = __le32_to_cpu(sb->layout);
501 info->array.md_minor = -1;
502 info->array.ctime = __le64_to_cpu(sb->ctime);
503 info->array.utime = __le64_to_cpu(sb->utime);
504 info->array.chunk_size = __le32_to_cpu(sb->chunksize)*512;
505 info->array.state =
506 (__le64_to_cpu(sb->resync_offset) >= __le64_to_cpu(sb->size))
507 ? 1 : 0;
508
509 info->data_offset = __le64_to_cpu(sb->data_offset);
510 info->component_size = __le64_to_cpu(sb->size);
511
512 info->disk.major = 0;
513 info->disk.minor = 0;
514 info->disk.number = __le32_to_cpu(sb->dev_number);
515 if (__le32_to_cpu(sb->dev_number) >= __le32_to_cpu(sb->max_dev) ||
516 __le32_to_cpu(sb->max_dev) > 512)
517 role = 0xfffe;
518 else
519 role = __le16_to_cpu(sb->dev_roles[__le32_to_cpu(sb->dev_number)]);
520
521 info->disk.raid_disk = -1;
522 switch(role) {
523 case 0xFFFF:
524 info->disk.state = 2; /* spare: ACTIVE, not sync, not faulty */
525 break;
526 case 0xFFFE:
527 info->disk.state = 1; /* faulty */
528 break;
529 default:
530 info->disk.state = 6; /* active and in sync */
531 info->disk.raid_disk = role;
532 }
533 info->events = __le64_to_cpu(sb->events);
534 sprintf(info->text_version, "1.%d", st->minor_version);
535
536 memcpy(info->uuid, sb->set_uuid, 16);
537
538 strncpy(info->name, sb->set_name, 32);
539 info->name[32] = 0;
540
541 if (sb->feature_map & __le32_to_cpu(MD_FEATURE_RESHAPE_ACTIVE)) {
542 info->reshape_active = 1;
543 info->reshape_progress = __le64_to_cpu(sb->reshape_position);
544 info->new_level = __le32_to_cpu(sb->new_level);
545 info->delta_disks = __le32_to_cpu(sb->delta_disks);
546 info->new_layout = __le32_to_cpu(sb->new_layout);
547 info->new_chunk = __le32_to_cpu(sb->new_chunk)<<9;
548 } else
549 info->reshape_active = 0;
550
551 for (i=0; i< __le32_to_cpu(sb->max_dev); i++) {
552 role = __le16_to_cpu(sb->dev_roles[i]);
553 if (/*role == 0xFFFF || */role < info->array.raid_disks)
554 working++;
555 }
556
557 info->array.working_disks = working;
558 }
559
560 static int update_super1(struct supertype *st, struct mdinfo *info,
561 char *update,
562 char *devname, int verbose,
563 int uuid_set, char *homehost)
564 {
565 /* NOTE: for 'assemble' and 'force' we need to return non-zero if any change was made.
566 * For others, the return value is ignored.
567 */
568 int rv = 0;
569 struct mdp_superblock_1 *sb = st->sb;
570
571 if (strcmp(update, "force-one")==0) {
572 /* Not enough devices for a working array,
573 * so bring this one up-to-date
574 */
575 if (sb->events != __cpu_to_le64(info->events))
576 rv = 1;
577 sb->events = __cpu_to_le64(info->events);
578 }
579 if (strcmp(update, "force-array")==0) {
580 /* Degraded array and 'force' requests to
581 * maybe need to mark it 'clean'.
582 */
583 switch(__le32_to_cpu(sb->level)) {
584 case 5: case 4: case 6:
585 /* need to force clean */
586 if (sb->resync_offset != ~0ULL)
587 rv = 1;
588 sb->resync_offset = ~0ULL;
589 }
590 }
591 if (strcmp(update, "assemble")==0) {
592 int d = info->disk.number;
593 int want;
594 if (info->disk.state == 6)
595 want = __cpu_to_le32(info->disk.raid_disk);
596 else
597 want = 0xFFFF;
598 if (sb->dev_roles[d] != want) {
599 sb->dev_roles[d] = want;
600 rv = 1;
601 }
602 }
603 if (strcmp(update, "linear-grow-new") == 0) {
604 int i;
605 int rfd;
606 int max = __le32_to_cpu(sb->max_dev);
607
608 for (i=0 ; i < max ; i++)
609 if (__le16_to_cpu(sb->dev_roles[i]) >= 0xfffe)
610 break;
611 sb->dev_number = __cpu_to_le32(i);
612 info->disk.number = i;
613 if (max >= __le32_to_cpu(sb->max_dev))
614 sb->max_dev = __cpu_to_le32(max+1);
615
616 if ((rfd = open("/dev/urandom", O_RDONLY)) < 0 ||
617 read(rfd, sb->device_uuid, 16) != 16) {
618 *(__u32*)(sb->device_uuid) = random();
619 *(__u32*)(sb->device_uuid+4) = random();
620 *(__u32*)(sb->device_uuid+8) = random();
621 *(__u32*)(sb->device_uuid+12) = random();
622 }
623
624 sb->dev_roles[i] =
625 __cpu_to_le16(info->disk.raid_disk);
626 }
627 if (strcmp(update, "linear-grow-update") == 0) {
628 sb->raid_disks = __cpu_to_le32(info->array.raid_disks);
629 sb->dev_roles[info->disk.number] =
630 __cpu_to_le16(info->disk.raid_disk);
631 }
632 if (strcmp(update, "resync") == 0) {
633 /* make sure resync happens */
634 sb->resync_offset = 0ULL;
635 }
636 if (strcmp(update, "uuid") == 0) {
637 copy_uuid(sb->set_uuid, info->uuid, super1.swapuuid);
638
639 if (__le32_to_cpu(sb->feature_map)&MD_FEATURE_BITMAP_OFFSET) {
640 struct bitmap_super_s *bm;
641 bm = (struct bitmap_super_s*)(st->sb+1024);
642 memcpy(bm->uuid, sb->set_uuid, 16);
643 }
644 }
645 if (strcmp(update, "homehost") == 0 &&
646 homehost) {
647 char *c;
648 update = "name";
649 c = strchr(sb->set_name, ':');
650 if (c)
651 strncpy(info->name, c+1, 31 - (c-sb->set_name));
652 else
653 strncpy(info->name, sb->set_name, 32);
654 info->name[32] = 0;
655 }
656 if (strcmp(update, "name") == 0) {
657 if (info->name[0] == 0)
658 sprintf(info->name, "%d", info->array.md_minor);
659 memset(sb->set_name, 0, sizeof(sb->set_name));
660 if (homehost &&
661 strchr(info->name, ':') == NULL &&
662 strlen(homehost)+1+strlen(info->name) < 32) {
663 strcpy(sb->set_name, homehost);
664 strcat(sb->set_name, ":");
665 strcat(sb->set_name, info->name);
666 } else
667 strcpy(sb->set_name, info->name);
668 }
669 if (strcmp(update, "devicesize") == 0 &&
670 __le64_to_cpu(sb->super_offset) <
671 __le64_to_cpu(sb->data_offset)) {
672 /* set data_size to device size less data_offset */
673 struct misc_dev_info *misc = (struct misc_dev_info*)
674 (st->sb + 1024 + 512);
675 printf("Size was %llu\n", (unsigned long long)
676 __le64_to_cpu(sb->data_size));
677 sb->data_size = __cpu_to_le64(
678 misc->device_size - __le64_to_cpu(sb->data_offset));
679 printf("Size is %llu\n", (unsigned long long)
680 __le64_to_cpu(sb->data_size));
681 }
682 if (strcmp(update, "_reshape_progress")==0)
683 sb->reshape_position = __cpu_to_le64(info->reshape_progress);
684
685 sb->sb_csum = calc_sb_1_csum(sb);
686 return rv;
687 }
688
689 static int init_super1(struct supertype *st, mdu_array_info_t *info,
690 unsigned long long size, char *name, char *homehost, int *uuid)
691 {
692 struct mdp_superblock_1 *sb;
693 int spares;
694 int rfd;
695 char defname[10];
696
697 posix_memalign((void**)&sb, 512, (1024 + 512 +
698 sizeof(struct misc_dev_info)));
699 memset(sb, 0, 1024);
700
701 st->sb = sb;
702 if (info == NULL) {
703 /* zeroing superblock */
704 return 0;
705 }
706
707 spares = info->working_disks - info->active_disks;
708 if (info->raid_disks + spares > 384) {
709 fprintf(stderr, Name ": too many devices requested: %d+%d > %d\n",
710 info->raid_disks , spares, 384);
711 return 0;
712 }
713
714 sb->magic = __cpu_to_le32(MD_SB_MAGIC);
715 sb->major_version = __cpu_to_le32(1);
716 sb->feature_map = 0;
717 sb->pad0 = 0;
718
719 if (uuid)
720 copy_uuid(sb->set_uuid, uuid, super1.swapuuid);
721 else {
722 if ((rfd = open("/dev/urandom", O_RDONLY)) < 0 ||
723 read(rfd, sb->set_uuid, 16) != 16) {
724 *(__u32*)(sb->set_uuid) = random();
725 *(__u32*)(sb->set_uuid+4) = random();
726 *(__u32*)(sb->set_uuid+8) = random();
727 *(__u32*)(sb->set_uuid+12) = random();
728 }
729 if (rfd >= 0) close(rfd);
730 }
731
732 if (name == NULL || *name == 0) {
733 sprintf(defname, "%d", info->md_minor);
734 name = defname;
735 }
736 memset(sb->set_name, 0, 32);
737 if (homehost &&
738 strchr(name, ':')== NULL &&
739 strlen(homehost)+1+strlen(name) < 32) {
740 strcpy(sb->set_name, homehost);
741 strcat(sb->set_name, ":");
742 strcat(sb->set_name, name);
743 } else
744 strcpy(sb->set_name, name);
745
746 sb->ctime = __cpu_to_le64((unsigned long long)time(0));
747 sb->level = __cpu_to_le32(info->level);
748 sb->layout = __cpu_to_le32(info->layout);
749 sb->size = __cpu_to_le64(size*2ULL);
750 sb->chunksize = __cpu_to_le32(info->chunk_size>>9);
751 sb->raid_disks = __cpu_to_le32(info->raid_disks);
752
753 sb->data_offset = __cpu_to_le64(0);
754 sb->data_size = __cpu_to_le64(0);
755 sb->super_offset = __cpu_to_le64(0);
756 sb->recovery_offset = __cpu_to_le64(0);
757
758 sb->utime = sb->ctime;
759 sb->events = __cpu_to_le64(1);
760 if (info->state & (1<<MD_SB_CLEAN))
761 sb->resync_offset = ~0ULL;
762 else
763 sb->resync_offset = 0;
764 sb->max_dev = __cpu_to_le32((1024- sizeof(struct mdp_superblock_1))/
765 sizeof(sb->dev_roles[0]));
766 memset(sb->pad3, 0, sizeof(sb->pad3));
767
768 memset(sb->dev_roles, 0xff, 1024 - sizeof(struct mdp_superblock_1));
769
770 return 1;
771 }
772
773 struct devinfo {
774 int fd;
775 char *devname;
776 mdu_disk_info_t disk;
777 struct devinfo *next;
778 };
779 /* Add a device to the superblock being created */
780 static void add_to_super1(struct supertype *st, mdu_disk_info_t *dk,
781 int fd, char *devname)
782 {
783 struct mdp_superblock_1 *sb = st->sb;
784 __u16 *rp = sb->dev_roles + dk->number;
785 struct devinfo *di, **dip;
786
787 if ((dk->state & 6) == 6) /* active, sync */
788 *rp = __cpu_to_le16(dk->raid_disk);
789 else if ((dk->state & ~2) == 0) /* active or idle -> spare */
790 *rp = 0xffff;
791 else
792 *rp = 0xfffe;
793
794 sb->dev_number = __cpu_to_le32(dk->number);
795 sb->sb_csum = calc_sb_1_csum(sb);
796
797 dip = (struct devinfo **)&st->info;
798 while (*dip)
799 dip = &(*dip)->next;
800 di = malloc(sizeof(struct devinfo));
801 di->fd = fd;
802 di->devname = devname;
803 di->disk = *dk;
804 di->next = NULL;
805 *dip = di;
806 }
807
808 static void locate_bitmap1(struct supertype *st, int fd);
809
810 static int store_super1(struct supertype *st, int fd)
811 {
812 struct mdp_superblock_1 *sb = st->sb;
813 unsigned long long sb_offset;
814 int sbsize;
815 unsigned long long dsize;
816
817 if (!get_dev_size(fd, NULL, &dsize))
818 return 1;
819
820 dsize >>= 9;
821
822 if (dsize < 24)
823 return 2;
824
825 /*
826 * Calculate the position of the superblock.
827 * It is always aligned to a 4K boundary and
828 * depending on minor_version, it can be:
829 * 0: At least 8K, but less than 12K, from end of device
830 * 1: At start of device
831 * 2: 4K from start of device.
832 */
833 switch(st->minor_version) {
834 case 0:
835 sb_offset = dsize;
836 sb_offset -= 8*2;
837 sb_offset &= ~(4*2-1);
838 break;
839 case 1:
840 sb_offset = 0;
841 break;
842 case 2:
843 sb_offset = 4*2;
844 break;
845 default:
846 return -EINVAL;
847 }
848
849
850
851 if (sb_offset != __le64_to_cpu(sb->super_offset) &&
852 0 != __le64_to_cpu(sb->super_offset)
853 ) {
854 fprintf(stderr, Name ": internal error - sb_offset is wrong\n");
855 abort();
856 }
857
858 if (lseek64(fd, sb_offset << 9, 0)< 0LL)
859 return 3;
860
861 sbsize = sizeof(*sb) + 2 * __le32_to_cpu(sb->max_dev);
862 sbsize = (sbsize+511)&(~511UL);
863
864 if (write(fd, sb, sbsize) != sbsize)
865 return 4;
866
867 if (sb->feature_map & __cpu_to_le32(MD_FEATURE_BITMAP_OFFSET)) {
868 struct bitmap_super_s *bm = (struct bitmap_super_s*)
869 (((char*)sb)+1024);
870 if (__le32_to_cpu(bm->magic) == BITMAP_MAGIC) {
871 locate_bitmap1(st, fd);
872 if (write(fd, bm, ROUND_UP(sizeof(*bm),512)) !=
873 ROUND_UP(sizeof(*bm),512))
874 return 5;
875 }
876 }
877 fsync(fd);
878 return 0;
879 }
880
881 static int load_super1(struct supertype *st, int fd, char *devname);
882
883 static unsigned long choose_bm_space(unsigned long devsize)
884 {
885 /* if the device is bigger than 8Gig, save 64k for bitmap usage,
886 * if bigger than 200Gig, save 128k
887 */
888 if (devsize < 64*2) return 0;
889 if (devsize - 64*2 >= 200*1024*1024*2)
890 return 128*2;
891 if (devsize - 4*2 > 8*1024*1024*2)
892 return 64*2;
893 return 4*2;
894 }
895
896 #ifndef MDASSEMBLE
897 static int write_init_super1(struct supertype *st)
898 {
899 struct mdp_superblock_1 *sb = st->sb;
900 struct supertype refst;
901 int rfd;
902 int rv = 0;
903 int bm_space;
904 struct devinfo *di;
905 unsigned long long dsize, array_size;
906 long long sb_offset;
907
908 for (di = st->info; di && ! rv ; di = di->next) {
909 if (di->disk.state == 1)
910 continue;
911 if (di->fd < 0)
912 continue;
913
914 Kill(di->devname, 0, 1, 1);
915 Kill(di->devname, 0, 1, 1);
916
917 sb->dev_number = __cpu_to_le32(di->disk.number);
918 if (di->disk.state & (1<<MD_DISK_WRITEMOSTLY))
919 sb->devflags |= __cpu_to_le32(WriteMostly1);
920
921 if ((rfd = open("/dev/urandom", O_RDONLY)) < 0 ||
922 read(rfd, sb->device_uuid, 16) != 16) {
923 *(__u32*)(sb->device_uuid) = random();
924 *(__u32*)(sb->device_uuid+4) = random();
925 *(__u32*)(sb->device_uuid+8) = random();
926 *(__u32*)(sb->device_uuid+12) = random();
927 }
928 if (rfd >= 0) close(rfd);
929 sb->events = 0;
930
931 refst =*st;
932 refst.sb = NULL;
933 if (load_super1(&refst, di->fd, NULL)==0) {
934 struct mdp_superblock_1 *refsb = refst.sb;
935
936 memcpy(sb->device_uuid, refsb->device_uuid, 16);
937 if (memcmp(sb->set_uuid, refsb->set_uuid, 16)==0) {
938 /* same array, so preserve events and
939 * dev_number */
940 sb->events = refsb->events;
941 /* bugs in 2.6.17 and earlier mean the
942 * dev_number chosen in Manage must be preserved
943 */
944 if (get_linux_version() >= 2006018)
945 sb->dev_number = refsb->dev_number;
946 }
947 free(refsb);
948 }
949
950 if (!get_dev_size(di->fd, NULL, &dsize))
951 return 1;
952 dsize >>= 9;
953
954 if (dsize < 24) {
955 close(di->fd);
956 return 2;
957 }
958
959
960 /*
961 * Calculate the position of the superblock.
962 * It is always aligned to a 4K boundary and
963 * depending on minor_version, it can be:
964 * 0: At least 8K, but less than 12K, from end of device
965 * 1: At start of device
966 * 2: 4K from start of device.
967 * Depending on the array size, we might leave extra space
968 * for a bitmap.
969 */
970 array_size = __le64_to_cpu(sb->size);
971 /* work out how much space we left for a bitmap */
972 bm_space = choose_bm_space(array_size);
973
974 switch(st->minor_version) {
975 case 0:
976 sb_offset = dsize;
977 sb_offset -= 8*2;
978 sb_offset &= ~(4*2-1);
979 sb->super_offset = __cpu_to_le64(sb_offset);
980 sb->data_offset = __cpu_to_le64(0);
981 if (sb_offset - bm_space < array_size)
982 bm_space = sb_offset - array_size;
983 sb->data_size = __cpu_to_le64(sb_offset - bm_space);
984 break;
985 case 1:
986 sb->super_offset = __cpu_to_le64(0);
987 if (4*2 + bm_space + __le64_to_cpu(sb->size) > dsize)
988 bm_space = dsize - __le64_to_cpu(sb->size) -4*2;
989 sb->data_offset = __cpu_to_le64(bm_space + 4*2);
990 sb->data_size = __cpu_to_le64(dsize - bm_space - 4*2);
991 break;
992 case 2:
993 sb_offset = 4*2;
994 sb->super_offset = __cpu_to_le64(4*2);
995 if (4*2 + 4*2 + bm_space + __le64_to_cpu(sb->size)
996 > dsize)
997 bm_space = dsize - __le64_to_cpu(sb->size)
998 - 4*2 - 4*2;
999 sb->data_offset = __cpu_to_le64(4*2 + 4*2 + bm_space);
1000 sb->data_size = __cpu_to_le64(dsize - 4*2 - 4*2
1001 - bm_space );
1002 break;
1003 default:
1004 return -EINVAL;
1005 }
1006
1007
1008 sb->sb_csum = calc_sb_1_csum(sb);
1009 rv = store_super1(st, di->fd);
1010 if (rv)
1011 fprintf(stderr,
1012 Name ": failed to write superblock to %s\n",
1013 di->devname);
1014
1015 if (rv == 0 && (__le32_to_cpu(sb->feature_map) & 1))
1016 rv = st->ss->write_bitmap(st, di->fd);
1017 close(di->fd);
1018 di->fd = -1;
1019 }
1020 return rv;
1021 }
1022 #endif
1023
1024 static int compare_super1(struct supertype *st, struct supertype *tst)
1025 {
1026 /*
1027 * return:
1028 * 0 same, or first was empty, and second was copied
1029 * 1 second had wrong number
1030 * 2 wrong uuid
1031 * 3 wrong other info
1032 */
1033 struct mdp_superblock_1 *first = st->sb;
1034 struct mdp_superblock_1 *second = tst->sb;
1035
1036 if (second->magic != __cpu_to_le32(MD_SB_MAGIC))
1037 return 1;
1038 if (second->major_version != __cpu_to_le32(1))
1039 return 1;
1040
1041 if (!first) {
1042 posix_memalign((void**)&first, 512,
1043 1024 + 512 +
1044 sizeof(struct misc_dev_info));
1045 memcpy(first, second, 1024 + 512 +
1046 sizeof(struct misc_dev_info));
1047 st->sb = first;
1048 return 0;
1049 }
1050 if (memcmp(first->set_uuid, second->set_uuid, 16)!= 0)
1051 return 2;
1052
1053 if (first->ctime != second->ctime ||
1054 first->level != second->level ||
1055 first->layout != second->layout ||
1056 first->size != second->size ||
1057 first->chunksize != second->chunksize ||
1058 first->raid_disks != second->raid_disks)
1059 return 3;
1060 return 0;
1061 }
1062
1063 static void free_super1(struct supertype *st);
1064
1065 static int load_super1(struct supertype *st, int fd, char *devname)
1066 {
1067 unsigned long long dsize;
1068 unsigned long long sb_offset;
1069 struct mdp_superblock_1 *super;
1070 int uuid[4];
1071 struct bitmap_super_s *bsb;
1072 struct misc_dev_info *misc;
1073
1074 free_super1(st);
1075
1076 if (st->subarray[0])
1077 return 1;
1078
1079 if (st->ss == NULL || st->minor_version == -1) {
1080 int bestvers = -1;
1081 struct supertype tst;
1082 __u64 bestctime = 0;
1083 /* guess... choose latest ctime */
1084 memset(&tst, 0, sizeof(tst));
1085 tst.ss = &super1;
1086 for (tst.minor_version = 0; tst.minor_version <= 2 ; tst.minor_version++) {
1087 switch(load_super1(&tst, fd, devname)) {
1088 case 0: super = tst.sb;
1089 if (bestvers == -1 ||
1090 bestctime < __le64_to_cpu(super->ctime)) {
1091 bestvers = tst.minor_version;
1092 bestctime = __le64_to_cpu(super->ctime);
1093 }
1094 free(super);
1095 tst.sb = NULL;
1096 break;
1097 case 1: return 1; /*bad device */
1098 case 2: break; /* bad, try next */
1099 }
1100 }
1101 if (bestvers != -1) {
1102 int rv;
1103 tst.minor_version = bestvers;
1104 tst.ss = &super1;
1105 tst.max_devs = 384;
1106 rv = load_super1(&tst, fd, devname);
1107 if (rv == 0)
1108 *st = tst;
1109 return rv;
1110 }
1111 return 2;
1112 }
1113 if (!get_dev_size(fd, devname, &dsize))
1114 return 1;
1115 dsize >>= 9;
1116
1117 if (dsize < 24) {
1118 if (devname)
1119 fprintf(stderr, Name ": %s is too small for md: size is %llu sectors.\n",
1120 devname, dsize);
1121 return 1;
1122 }
1123
1124 /*
1125 * Calculate the position of the superblock.
1126 * It is always aligned to a 4K boundary and
1127 * depending on minor_version, it can be:
1128 * 0: At least 8K, but less than 12K, from end of device
1129 * 1: At start of device
1130 * 2: 4K from start of device.
1131 */
1132 switch(st->minor_version) {
1133 case 0:
1134 sb_offset = dsize;
1135 sb_offset -= 8*2;
1136 sb_offset &= ~(4*2-1);
1137 break;
1138 case 1:
1139 sb_offset = 0;
1140 break;
1141 case 2:
1142 sb_offset = 4*2;
1143 break;
1144 default:
1145 return -EINVAL;
1146 }
1147
1148 ioctl(fd, BLKFLSBUF, 0); /* make sure we read current data */
1149
1150
1151 if (lseek64(fd, sb_offset << 9, 0)< 0LL) {
1152 if (devname)
1153 fprintf(stderr, Name ": Cannot seek to superblock on %s: %s\n",
1154 devname, strerror(errno));
1155 return 1;
1156 }
1157
1158 posix_memalign((void**)&super, 512,
1159 1024 + 512 +
1160 sizeof(struct misc_dev_info));
1161
1162 if (read(fd, super, 1024) != 1024) {
1163 if (devname)
1164 fprintf(stderr, Name ": Cannot read superblock on %s\n",
1165 devname);
1166 free(super);
1167 return 1;
1168 }
1169
1170 if (__le32_to_cpu(super->magic) != MD_SB_MAGIC) {
1171 if (devname)
1172 fprintf(stderr, Name ": No super block found on %s (Expected magic %08x, got %08x)\n",
1173 devname, MD_SB_MAGIC, __le32_to_cpu(super->magic));
1174 free(super);
1175 return 2;
1176 }
1177
1178 if (__le32_to_cpu(super->major_version) != 1) {
1179 if (devname)
1180 fprintf(stderr, Name ": Cannot interpret superblock on %s - version is %d\n",
1181 devname, __le32_to_cpu(super->major_version));
1182 free(super);
1183 return 2;
1184 }
1185 if (__le64_to_cpu(super->super_offset) != sb_offset) {
1186 if (devname)
1187 fprintf(stderr, Name ": No superblock found on %s (super_offset is wrong)\n",
1188 devname);
1189 free(super);
1190 return 2;
1191 }
1192 st->sb = super;
1193
1194 bsb = (struct bitmap_super_s *)(((char*)super)+1024);
1195
1196 misc = (struct misc_dev_info*) (((char*)super)+1024+512);
1197 misc->device_size = dsize;
1198
1199 /* Now check on the bitmap superblock */
1200 if ((__le32_to_cpu(super->feature_map)&MD_FEATURE_BITMAP_OFFSET) == 0)
1201 return 0;
1202 /* Read the bitmap superblock and make sure it looks
1203 * valid. If it doesn't clear the bit. An --assemble --force
1204 * should get that written out.
1205 */
1206 locate_bitmap1(st, fd);
1207 if (read(fd, ((char*)super)+1024, 512)
1208 != 512)
1209 goto no_bitmap;
1210
1211 uuid_from_super1(st, uuid);
1212 if (__le32_to_cpu(bsb->magic) != BITMAP_MAGIC ||
1213 memcmp(bsb->uuid, uuid, 16) != 0)
1214 goto no_bitmap;
1215 return 0;
1216
1217 no_bitmap:
1218 super->feature_map = __cpu_to_le32(__le32_to_cpu(super->feature_map) & ~1);
1219 return 0;
1220 }
1221
1222
1223 static struct supertype *match_metadata_desc1(char *arg)
1224 {
1225 struct supertype *st = malloc(sizeof(*st));
1226 if (!st) return st;
1227
1228 memset(st, 0, sizeof(*st));
1229 st->ss = &super1;
1230 st->max_devs = 384;
1231 st->sb = NULL;
1232 if (strcmp(arg, "1.0") == 0) {
1233 st->minor_version = 0;
1234 return st;
1235 }
1236 if (strcmp(arg, "1.1") == 0) {
1237 st->minor_version = 1;
1238 return st;
1239 }
1240 if (strcmp(arg, "1.2") == 0) {
1241 st->minor_version = 2;
1242 return st;
1243 }
1244 if (strcmp(arg, "1") == 0 ||
1245 strcmp(arg, "default") == 0) {
1246 st->minor_version = -1;
1247 return st;
1248 }
1249
1250 free(st);
1251 return NULL;
1252 }
1253
1254 /* find available size on device with this devsize, using
1255 * superblock type st, and reserving 'reserve' sectors for
1256 * a possible bitmap
1257 */
1258 static __u64 avail_size1(struct supertype *st, __u64 devsize)
1259 {
1260 if (devsize < 24)
1261 return 0;
1262
1263 devsize -= choose_bm_space(devsize);
1264
1265 switch(st->minor_version) {
1266 case -1: /* no specified. Now time to set default */
1267 st->minor_version = 0;
1268 /* FALL THROUGH */
1269 case 0:
1270 /* at end */
1271 return ((devsize - 8*2 ) & ~(4*2-1));
1272 case 1:
1273 /* at start, 4K for superblock and possible bitmap */
1274 return devsize - 4*2;
1275 case 2:
1276 /* 4k from start, 4K for superblock and possible bitmap */
1277 return devsize - (4+4)*2;
1278 }
1279 return 0;
1280 }
1281
1282 static int
1283 add_internal_bitmap1(struct supertype *st,
1284 int *chunkp, int delay, int write_behind,
1285 unsigned long long size,
1286 int may_change, int major)
1287 {
1288 /*
1289 * If not may_change, then this is a 'Grow', and the bitmap
1290 * must fit after the superblock.
1291 * If may_change, then this is create, and we can put the bitmap
1292 * before the superblock if we like, or may move the start.
1293 * If !may_change, the bitmap MUST live at offset of 1K, until
1294 * we get a sysfs interface.
1295 *
1296 * size is in sectors, chunk is in bytes !!!
1297 */
1298
1299 unsigned long long bits;
1300 unsigned long long max_bits;
1301 unsigned long long min_chunk;
1302 long offset;
1303 int chunk = *chunkp;
1304 int room = 0;
1305 struct mdp_superblock_1 *sb = st->sb;
1306 bitmap_super_t *bms = (bitmap_super_t*)(((char*)sb) + 1024);
1307
1308 switch(st->minor_version) {
1309 case 0:
1310 /* either 3K after the superblock, or some amount of space
1311 * before.
1312 */
1313 if (may_change) {
1314 /* We are creating array, so we *know* how much room has
1315 * been left.
1316 */
1317 offset = 0;
1318 room = choose_bm_space(__le64_to_cpu(sb->size));
1319 if (room == 4*2) {
1320 /* make it 3K after the superblock */
1321 room = 3*2;
1322 offset = 2;
1323 }
1324 } else {
1325 room = __le64_to_cpu(sb->super_offset)
1326 - __le64_to_cpu(sb->data_offset)
1327 - __le64_to_cpu(sb->data_size);
1328 /* remove '1 ||' when we can set offset via sysfs */
1329 if (1 || (room < 3*2 &&
1330 __le32_to_cpu(sb->max_dev) <= 384)) {
1331 room = 3*2;
1332 offset = 1*2;
1333 } else {
1334 offset = 0; /* means movable offset */
1335 }
1336 }
1337 break;
1338 case 1:
1339 case 2: /* between superblock and data */
1340 if (may_change) {
1341 offset = 4*2;
1342 room = choose_bm_space(__le64_to_cpu(sb->size));
1343 } else {
1344 room = __le64_to_cpu(sb->data_offset)
1345 - __le64_to_cpu(sb->super_offset);
1346 if (1 || __le32_to_cpu(sb->max_dev) <= 384) {
1347 room -= 2;
1348 offset = 2;
1349 } else {
1350 room -= 4*2;
1351 offset = 4*2;
1352 }
1353 }
1354 break;
1355 default:
1356 return 0;
1357 }
1358
1359 if (chunk == UnSet && room > 128*2)
1360 /* Limit to 128K of bitmap when chunk size not requested */
1361 room = 128*2;
1362
1363 max_bits = (room * 512 - sizeof(bitmap_super_t)) * 8;
1364
1365 min_chunk = 4096; /* sub-page chunks don't work yet.. */
1366 bits = (size*512)/min_chunk +1;
1367 while (bits > max_bits) {
1368 min_chunk *= 2;
1369 bits = (bits+1)/2;
1370 }
1371 if (chunk == UnSet)
1372 chunk = min_chunk;
1373 else if (chunk < min_chunk)
1374 return 0; /* chunk size too small */
1375 if (chunk == 0) /* rounding problem */
1376 return 0;
1377
1378 if (offset == 0) {
1379 bits = (size*512) / chunk + 1;
1380 room = ((bits+7)/8 + sizeof(bitmap_super_t) +511)/512;
1381 offset = -room;
1382 }
1383
1384 sb->bitmap_offset = __cpu_to_le32(offset);
1385
1386 sb->feature_map = __cpu_to_le32(__le32_to_cpu(sb->feature_map) | 1);
1387 memset(bms, 0, sizeof(*bms));
1388 bms->magic = __cpu_to_le32(BITMAP_MAGIC);
1389 bms->version = __cpu_to_le32(major);
1390 uuid_from_super1(st, (int*)bms->uuid);
1391 bms->chunksize = __cpu_to_le32(chunk);
1392 bms->daemon_sleep = __cpu_to_le32(delay);
1393 bms->sync_size = __cpu_to_le64(size);
1394 bms->write_behind = __cpu_to_le32(write_behind);
1395
1396 *chunkp = chunk;
1397 return 1;
1398 }
1399
1400
1401 static void locate_bitmap1(struct supertype *st, int fd)
1402 {
1403 unsigned long long offset;
1404 struct mdp_superblock_1 *sb;
1405 int mustfree = 0;
1406
1407 if (!st->sb) {
1408 if (st->ss->load_super(st, fd, NULL))
1409 return; /* no error I hope... */
1410 mustfree = 1;
1411 }
1412 sb = st->sb;
1413
1414 offset = __le64_to_cpu(sb->super_offset);
1415 offset += (int32_t) __le32_to_cpu(sb->bitmap_offset);
1416 if (mustfree)
1417 free(sb);
1418 lseek64(fd, offset<<9, 0);
1419 }
1420
1421 static int write_bitmap1(struct supertype *st, int fd)
1422 {
1423 struct mdp_superblock_1 *sb = st->sb;
1424 bitmap_super_t *bms = (bitmap_super_t*)(((char*)sb)+1024);
1425 int rv = 0;
1426
1427 int towrite, n;
1428 char abuf[4096+512];
1429 char *buf = (char*)(((long)(abuf+512))&~511UL);
1430
1431 locate_bitmap1(st, fd);
1432
1433 memset(buf, 0xff, 4096);
1434 memcpy(buf, ((char*)sb)+1024, sizeof(bitmap_super_t));
1435
1436 towrite = __le64_to_cpu(bms->sync_size) / (__le32_to_cpu(bms->chunksize)>>9);
1437 towrite = (towrite+7) >> 3; /* bits to bytes */
1438 towrite += sizeof(bitmap_super_t);
1439 towrite = ROUND_UP(towrite, 512);
1440 while (towrite > 0) {
1441 n = towrite;
1442 if (n > 4096)
1443 n = 4096;
1444 n = write(fd, buf, n);
1445 if (n > 0)
1446 towrite -= n;
1447 else
1448 break;
1449 memset(buf, 0xff, 4096);
1450 }
1451 fsync(fd);
1452 if (towrite)
1453 rv = -2;
1454
1455 return rv;
1456 }
1457
1458 static void free_super1(struct supertype *st)
1459 {
1460 if (st->sb)
1461 free(st->sb);
1462 st->sb = NULL;
1463 }
1464
1465 static int validate_geometry1(struct supertype *st, int level,
1466 int layout, int raiddisks,
1467 int chunk, unsigned long long size,
1468 char *subdev, unsigned long long *freesize,
1469 int verbose)
1470 {
1471 unsigned long long ldsize;
1472 int fd;
1473
1474 if (level == LEVEL_CONTAINER)
1475 return 0;
1476 if (!subdev)
1477 return 1;
1478
1479 fd = open(subdev, O_RDONLY|O_EXCL, 0);
1480 if (fd < 0) {
1481 if (verbose)
1482 fprintf(stderr, Name ": super1.x cannot open %s: %s\n",
1483 subdev, strerror(errno));
1484 return 0;
1485 }
1486
1487 if (!get_dev_size(fd, subdev, &ldsize)) {
1488 close(fd);
1489 return 0;
1490 }
1491 close(fd);
1492
1493 *freesize = avail_size1(st, ldsize >> 9);
1494 return 1;
1495 }
1496
1497 struct superswitch super1 = {
1498 #ifndef MDASSEMBLE
1499 .examine_super = examine_super1,
1500 .brief_examine_super = brief_examine_super1,
1501 .export_examine_super = export_examine_super1,
1502 .detail_super = detail_super1,
1503 .brief_detail_super = brief_detail_super1,
1504 .export_detail_super = export_detail_super1,
1505 .write_init_super = write_init_super1,
1506 #endif
1507 .match_home = match_home1,
1508 .uuid_from_super = uuid_from_super1,
1509 .getinfo_super = getinfo_super1,
1510 .update_super = update_super1,
1511 .init_super = init_super1,
1512 .add_to_super = add_to_super1,
1513 .store_super = store_super1,
1514 .compare_super = compare_super1,
1515 .load_super = load_super1,
1516 .match_metadata_desc = match_metadata_desc1,
1517 .avail_size = avail_size1,
1518 .add_internal_bitmap = add_internal_bitmap1,
1519 .locate_bitmap = locate_bitmap1,
1520 .write_bitmap = write_bitmap1,
1521 .free_super = free_super1,
1522 .validate_geometry = validate_geometry1,
1523 #if __BYTE_ORDER == BIG_ENDIAN
1524 .swapuuid = 0,
1525 #else
1526 .swapuuid = 1,
1527 #endif
1528 };
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