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ddf: Set container_member from subarray in getinfo_super.
[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 + sizeof(struct bitmap_super_s));
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 = malloc(1024 + sizeof(bitmap_super_t) +
693 sizeof(struct misc_dev_info));
694 int spares;
695 int rfd;
696 char defname[10];
697 memset(sb, 0, 1024);
698
699 st->sb = sb;
700 if (info == NULL) {
701 /* zeroing superblock */
702 return 0;
703 }
704
705 spares = info->working_disks - info->active_disks;
706 if (info->raid_disks + spares > 384) {
707 fprintf(stderr, Name ": too many devices requested: %d+%d > %d\n",
708 info->raid_disks , spares, 384);
709 return 0;
710 }
711
712 sb->magic = __cpu_to_le32(MD_SB_MAGIC);
713 sb->major_version = __cpu_to_le32(1);
714 sb->feature_map = 0;
715 sb->pad0 = 0;
716
717 if (uuid)
718 copy_uuid(sb->set_uuid, uuid, super1.swapuuid);
719 else {
720 if ((rfd = open("/dev/urandom", O_RDONLY)) < 0 ||
721 read(rfd, sb->set_uuid, 16) != 16) {
722 *(__u32*)(sb->set_uuid) = random();
723 *(__u32*)(sb->set_uuid+4) = random();
724 *(__u32*)(sb->set_uuid+8) = random();
725 *(__u32*)(sb->set_uuid+12) = random();
726 }
727 if (rfd >= 0) close(rfd);
728 }
729
730 if (name == NULL || *name == 0) {
731 sprintf(defname, "%d", info->md_minor);
732 name = defname;
733 }
734 memset(sb->set_name, 0, 32);
735 if (homehost &&
736 strchr(name, ':')== NULL &&
737 strlen(homehost)+1+strlen(name) < 32) {
738 strcpy(sb->set_name, homehost);
739 strcat(sb->set_name, ":");
740 strcat(sb->set_name, name);
741 } else
742 strcpy(sb->set_name, name);
743
744 sb->ctime = __cpu_to_le64((unsigned long long)time(0));
745 sb->level = __cpu_to_le32(info->level);
746 sb->layout = __cpu_to_le32(info->layout);
747 sb->size = __cpu_to_le64(size*2ULL);
748 sb->chunksize = __cpu_to_le32(info->chunk_size>>9);
749 sb->raid_disks = __cpu_to_le32(info->raid_disks);
750
751 sb->data_offset = __cpu_to_le64(0);
752 sb->data_size = __cpu_to_le64(0);
753 sb->super_offset = __cpu_to_le64(0);
754 sb->recovery_offset = __cpu_to_le64(0);
755
756 sb->utime = sb->ctime;
757 sb->events = __cpu_to_le64(1);
758 if (info->state & (1<<MD_SB_CLEAN))
759 sb->resync_offset = ~0ULL;
760 else
761 sb->resync_offset = 0;
762 sb->max_dev = __cpu_to_le32((1024- sizeof(struct mdp_superblock_1))/
763 sizeof(sb->dev_roles[0]));
764 memset(sb->pad3, 0, sizeof(sb->pad3));
765
766 memset(sb->dev_roles, 0xff, 1024 - sizeof(struct mdp_superblock_1));
767
768 return 1;
769 }
770
771 struct devinfo {
772 int fd;
773 char *devname;
774 mdu_disk_info_t disk;
775 struct devinfo *next;
776 };
777 /* Add a device to the superblock being created */
778 static void add_to_super1(struct supertype *st, mdu_disk_info_t *dk,
779 int fd, char *devname)
780 {
781 struct mdp_superblock_1 *sb = st->sb;
782 __u16 *rp = sb->dev_roles + dk->number;
783 struct devinfo *di, **dip;
784
785 if ((dk->state & 6) == 6) /* active, sync */
786 *rp = __cpu_to_le16(dk->raid_disk);
787 else if ((dk->state & ~2) == 0) /* active or idle -> spare */
788 *rp = 0xffff;
789 else
790 *rp = 0xfffe;
791
792 sb->dev_number = __cpu_to_le32(dk->number);
793 sb->sb_csum = calc_sb_1_csum(sb);
794
795 dip = (struct devinfo **)&st->info;
796 while (*dip)
797 dip = &(*dip)->next;
798 di = malloc(sizeof(struct devinfo));
799 di->fd = fd;
800 di->devname = devname;
801 di->disk = *dk;
802 di->next = NULL;
803 *dip = di;
804 }
805
806 static void locate_bitmap1(struct supertype *st, int fd);
807
808 static int store_super1(struct supertype *st, int fd)
809 {
810 struct mdp_superblock_1 *sb = st->sb;
811 unsigned long long sb_offset;
812 int sbsize;
813 unsigned long long dsize;
814
815 if (!get_dev_size(fd, NULL, &dsize))
816 return 1;
817
818 dsize >>= 9;
819
820 if (dsize < 24)
821 return 2;
822
823 /*
824 * Calculate the position of the superblock.
825 * It is always aligned to a 4K boundary and
826 * depending on minor_version, it can be:
827 * 0: At least 8K, but less than 12K, from end of device
828 * 1: At start of device
829 * 2: 4K from start of device.
830 */
831 switch(st->minor_version) {
832 case 0:
833 sb_offset = dsize;
834 sb_offset -= 8*2;
835 sb_offset &= ~(4*2-1);
836 break;
837 case 1:
838 sb_offset = 0;
839 break;
840 case 2:
841 sb_offset = 4*2;
842 break;
843 default:
844 return -EINVAL;
845 }
846
847
848
849 if (sb_offset != __le64_to_cpu(sb->super_offset) &&
850 0 != __le64_to_cpu(sb->super_offset)
851 ) {
852 fprintf(stderr, Name ": internal error - sb_offset is wrong\n");
853 abort();
854 }
855
856 if (lseek64(fd, sb_offset << 9, 0)< 0LL)
857 return 3;
858
859 sbsize = sizeof(*sb) + 2 * __le32_to_cpu(sb->max_dev);
860
861 if (write(fd, sb, sbsize) != sbsize)
862 return 4;
863
864 if (sb->feature_map & __cpu_to_le32(MD_FEATURE_BITMAP_OFFSET)) {
865 struct bitmap_super_s *bm = (struct bitmap_super_s*)
866 (((char*)sb)+1024);
867 if (__le32_to_cpu(bm->magic) == BITMAP_MAGIC) {
868 locate_bitmap1(st, fd);
869 if (write(fd, bm, sizeof(*bm)) != sizeof(*bm))
870 return 5;
871 }
872 }
873 fsync(fd);
874 return 0;
875 }
876
877 static int load_super1(struct supertype *st, int fd, char *devname);
878
879 static unsigned long choose_bm_space(unsigned long devsize)
880 {
881 /* if the device is bigger than 8Gig, save 64k for bitmap usage,
882 * if bigger than 200Gig, save 128k
883 */
884 if (devsize < 64*2) return 0;
885 if (devsize - 64*2 >= 200*1024*1024*2)
886 return 128*2;
887 if (devsize - 4*2 > 8*1024*1024*2)
888 return 64*2;
889 return 4*2;
890 }
891
892 #ifndef MDASSEMBLE
893 static int write_init_super1(struct supertype *st)
894 {
895 struct mdp_superblock_1 *sb = st->sb;
896 struct supertype refst;
897 int rfd;
898 int rv = 0;
899 int bm_space;
900 struct devinfo *di;
901 unsigned long long dsize, array_size;
902 long long sb_offset;
903
904 for (di = st->info; di && ! rv ; di = di->next) {
905 if (di->disk.state == 1)
906 continue;
907 if (di->fd < 0)
908 continue;
909
910 Kill(di->devname, 0, 1, 1);
911 Kill(di->devname, 0, 1, 1);
912
913 sb->dev_number = __cpu_to_le32(di->disk.number);
914 if (di->disk.state & (1<<MD_DISK_WRITEMOSTLY))
915 sb->devflags |= __cpu_to_le32(WriteMostly1);
916
917 if ((rfd = open("/dev/urandom", O_RDONLY)) < 0 ||
918 read(rfd, sb->device_uuid, 16) != 16) {
919 *(__u32*)(sb->device_uuid) = random();
920 *(__u32*)(sb->device_uuid+4) = random();
921 *(__u32*)(sb->device_uuid+8) = random();
922 *(__u32*)(sb->device_uuid+12) = random();
923 }
924 if (rfd >= 0) close(rfd);
925 sb->events = 0;
926
927 refst =*st;
928 refst.sb = NULL;
929 if (load_super1(&refst, di->fd, NULL)==0) {
930 struct mdp_superblock_1 *refsb = refst.sb;
931
932 memcpy(sb->device_uuid, refsb->device_uuid, 16);
933 if (memcmp(sb->set_uuid, refsb->set_uuid, 16)==0) {
934 /* same array, so preserve events and
935 * dev_number */
936 sb->events = refsb->events;
937 /* bugs in 2.6.17 and earlier mean the
938 * dev_number chosen in Manage must be preserved
939 */
940 if (get_linux_version() >= 2006018)
941 sb->dev_number = refsb->dev_number;
942 }
943 free(refsb);
944 }
945
946 if (!get_dev_size(di->fd, NULL, &dsize))
947 return 1;
948 dsize >>= 9;
949
950 if (dsize < 24) {
951 close(di->fd);
952 return 2;
953 }
954
955
956 /*
957 * Calculate the position of the superblock.
958 * It is always aligned to a 4K boundary and
959 * depending on minor_version, it can be:
960 * 0: At least 8K, but less than 12K, from end of device
961 * 1: At start of device
962 * 2: 4K from start of device.
963 * Depending on the array size, we might leave extra space
964 * for a bitmap.
965 */
966 array_size = __le64_to_cpu(sb->size);
967 /* work out how much space we left for a bitmap */
968 bm_space = choose_bm_space(array_size);
969
970 switch(st->minor_version) {
971 case 0:
972 sb_offset = dsize;
973 sb_offset -= 8*2;
974 sb_offset &= ~(4*2-1);
975 sb->super_offset = __cpu_to_le64(sb_offset);
976 sb->data_offset = __cpu_to_le64(0);
977 if (sb_offset - bm_space < array_size)
978 bm_space = sb_offset - array_size;
979 sb->data_size = __cpu_to_le64(sb_offset - bm_space);
980 break;
981 case 1:
982 sb->super_offset = __cpu_to_le64(0);
983 if (4*2 + bm_space + __le64_to_cpu(sb->size) > dsize)
984 bm_space = dsize - __le64_to_cpu(sb->size) -4*2;
985 sb->data_offset = __cpu_to_le64(bm_space + 4*2);
986 sb->data_size = __cpu_to_le64(dsize - bm_space - 4*2);
987 break;
988 case 2:
989 sb_offset = 4*2;
990 sb->super_offset = __cpu_to_le64(4*2);
991 if (4*2 + 4*2 + bm_space + __le64_to_cpu(sb->size)
992 > dsize)
993 bm_space = dsize - __le64_to_cpu(sb->size)
994 - 4*2 - 4*2;
995 sb->data_offset = __cpu_to_le64(4*2 + 4*2 + bm_space);
996 sb->data_size = __cpu_to_le64(dsize - 4*2 - 4*2
997 - bm_space );
998 break;
999 default:
1000 return -EINVAL;
1001 }
1002
1003
1004 sb->sb_csum = calc_sb_1_csum(sb);
1005 rv = store_super1(st, di->fd);
1006 if (rv)
1007 fprintf(stderr,
1008 Name ": failed to write superblock to %s\n",
1009 di->devname);
1010
1011 if (rv == 0 && (__le32_to_cpu(sb->feature_map) & 1))
1012 rv = st->ss->write_bitmap(st, di->fd);
1013 close(di->fd);
1014 di->fd = -1;
1015 }
1016 return rv;
1017 }
1018 #endif
1019
1020 static int compare_super1(struct supertype *st, struct supertype *tst)
1021 {
1022 /*
1023 * return:
1024 * 0 same, or first was empty, and second was copied
1025 * 1 second had wrong number
1026 * 2 wrong uuid
1027 * 3 wrong other info
1028 */
1029 struct mdp_superblock_1 *first = st->sb;
1030 struct mdp_superblock_1 *second = tst->sb;
1031
1032 if (second->magic != __cpu_to_le32(MD_SB_MAGIC))
1033 return 1;
1034 if (second->major_version != __cpu_to_le32(1))
1035 return 1;
1036
1037 if (!first) {
1038 first = malloc(1024+sizeof(bitmap_super_t) +
1039 sizeof(struct misc_dev_info));
1040 memcpy(first, second, 1024+sizeof(bitmap_super_t) +
1041 sizeof(struct misc_dev_info));
1042 st->sb = first;
1043 return 0;
1044 }
1045 if (memcmp(first->set_uuid, second->set_uuid, 16)!= 0)
1046 return 2;
1047
1048 if (first->ctime != second->ctime ||
1049 first->level != second->level ||
1050 first->layout != second->layout ||
1051 first->size != second->size ||
1052 first->chunksize != second->chunksize ||
1053 first->raid_disks != second->raid_disks)
1054 return 3;
1055 return 0;
1056 }
1057
1058 static void free_super1(struct supertype *st);
1059
1060 static int load_super1(struct supertype *st, int fd, char *devname)
1061 {
1062 unsigned long long dsize;
1063 unsigned long long sb_offset;
1064 struct mdp_superblock_1 *super;
1065 int uuid[4];
1066 struct bitmap_super_s *bsb;
1067 struct misc_dev_info *misc;
1068
1069 free_super1(st);
1070
1071 if (st->subarray[0])
1072 return 1;
1073
1074 if (st->ss == NULL || st->minor_version == -1) {
1075 int bestvers = -1;
1076 struct supertype tst;
1077 __u64 bestctime = 0;
1078 /* guess... choose latest ctime */
1079 memset(&tst, 0, sizeof(tst));
1080 tst.ss = &super1;
1081 for (tst.minor_version = 0; tst.minor_version <= 2 ; tst.minor_version++) {
1082 switch(load_super1(&tst, fd, devname)) {
1083 case 0: super = tst.sb;
1084 if (bestvers == -1 ||
1085 bestctime < __le64_to_cpu(super->ctime)) {
1086 bestvers = tst.minor_version;
1087 bestctime = __le64_to_cpu(super->ctime);
1088 }
1089 free(super);
1090 tst.sb = NULL;
1091 break;
1092 case 1: return 1; /*bad device */
1093 case 2: break; /* bad, try next */
1094 }
1095 }
1096 if (bestvers != -1) {
1097 int rv;
1098 tst.minor_version = bestvers;
1099 tst.ss = &super1;
1100 tst.max_devs = 384;
1101 rv = load_super1(&tst, fd, devname);
1102 if (rv == 0)
1103 *st = tst;
1104 return rv;
1105 }
1106 return 2;
1107 }
1108 if (!get_dev_size(fd, devname, &dsize))
1109 return 1;
1110 dsize >>= 9;
1111
1112 if (dsize < 24) {
1113 if (devname)
1114 fprintf(stderr, Name ": %s is too small for md: size is %llu sectors.\n",
1115 devname, dsize);
1116 return 1;
1117 }
1118
1119 /*
1120 * Calculate the position of the superblock.
1121 * It is always aligned to a 4K boundary and
1122 * depending on minor_version, it can be:
1123 * 0: At least 8K, but less than 12K, from end of device
1124 * 1: At start of device
1125 * 2: 4K from start of device.
1126 */
1127 switch(st->minor_version) {
1128 case 0:
1129 sb_offset = dsize;
1130 sb_offset -= 8*2;
1131 sb_offset &= ~(4*2-1);
1132 break;
1133 case 1:
1134 sb_offset = 0;
1135 break;
1136 case 2:
1137 sb_offset = 4*2;
1138 break;
1139 default:
1140 return -EINVAL;
1141 }
1142
1143 ioctl(fd, BLKFLSBUF, 0); /* make sure we read current data */
1144
1145
1146 if (lseek64(fd, sb_offset << 9, 0)< 0LL) {
1147 if (devname)
1148 fprintf(stderr, Name ": Cannot seek to superblock on %s: %s\n",
1149 devname, strerror(errno));
1150 return 1;
1151 }
1152
1153 super = malloc(1024 + sizeof(bitmap_super_t) +
1154 sizeof(struct misc_dev_info));
1155
1156 if (read(fd, super, 1024) != 1024) {
1157 if (devname)
1158 fprintf(stderr, Name ": Cannot read superblock on %s\n",
1159 devname);
1160 free(super);
1161 return 1;
1162 }
1163
1164 if (__le32_to_cpu(super->magic) != MD_SB_MAGIC) {
1165 if (devname)
1166 fprintf(stderr, Name ": No super block found on %s (Expected magic %08x, got %08x)\n",
1167 devname, MD_SB_MAGIC, __le32_to_cpu(super->magic));
1168 free(super);
1169 return 2;
1170 }
1171
1172 if (__le32_to_cpu(super->major_version) != 1) {
1173 if (devname)
1174 fprintf(stderr, Name ": Cannot interpret superblock on %s - version is %d\n",
1175 devname, __le32_to_cpu(super->major_version));
1176 free(super);
1177 return 2;
1178 }
1179 if (__le64_to_cpu(super->super_offset) != sb_offset) {
1180 if (devname)
1181 fprintf(stderr, Name ": No superblock found on %s (super_offset is wrong)\n",
1182 devname);
1183 free(super);
1184 return 2;
1185 }
1186 st->sb = super;
1187
1188 bsb = (struct bitmap_super_s *)(((char*)super)+1024);
1189
1190 misc = (struct misc_dev_info*) (bsb+1);
1191 misc->device_size = dsize;
1192
1193 /* Now check on the bitmap superblock */
1194 if ((__le32_to_cpu(super->feature_map)&MD_FEATURE_BITMAP_OFFSET) == 0)
1195 return 0;
1196 /* Read the bitmap superblock and make sure it looks
1197 * valid. If it doesn't clear the bit. An --assemble --force
1198 * should get that written out.
1199 */
1200 locate_bitmap1(st, fd);
1201 if (read(fd, ((char*)super)+1024, sizeof(struct bitmap_super_s))
1202 != sizeof(struct bitmap_super_s))
1203 goto no_bitmap;
1204
1205 uuid_from_super1(st, uuid);
1206 if (__le32_to_cpu(bsb->magic) != BITMAP_MAGIC ||
1207 memcmp(bsb->uuid, uuid, 16) != 0)
1208 goto no_bitmap;
1209 return 0;
1210
1211 no_bitmap:
1212 super->feature_map = __cpu_to_le32(__le32_to_cpu(super->feature_map) & ~1);
1213 return 0;
1214 }
1215
1216
1217 static struct supertype *match_metadata_desc1(char *arg)
1218 {
1219 struct supertype *st = malloc(sizeof(*st));
1220 if (!st) return st;
1221
1222 memset(st, 0, sizeof(*st));
1223 st->ss = &super1;
1224 st->max_devs = 384;
1225 st->sb = NULL;
1226 if (strcmp(arg, "1.0") == 0) {
1227 st->minor_version = 0;
1228 return st;
1229 }
1230 if (strcmp(arg, "1.1") == 0) {
1231 st->minor_version = 1;
1232 return st;
1233 }
1234 if (strcmp(arg, "1.2") == 0) {
1235 st->minor_version = 2;
1236 return st;
1237 }
1238 if (strcmp(arg, "1") == 0 ||
1239 strcmp(arg, "default") == 0) {
1240 st->minor_version = -1;
1241 return st;
1242 }
1243
1244 free(st);
1245 return NULL;
1246 }
1247
1248 /* find available size on device with this devsize, using
1249 * superblock type st, and reserving 'reserve' sectors for
1250 * a possible bitmap
1251 */
1252 static __u64 avail_size1(struct supertype *st, __u64 devsize)
1253 {
1254 if (devsize < 24)
1255 return 0;
1256
1257 devsize -= choose_bm_space(devsize);
1258
1259 switch(st->minor_version) {
1260 case -1: /* no specified. Now time to set default */
1261 st->minor_version = 0;
1262 /* FALL THROUGH */
1263 case 0:
1264 /* at end */
1265 return ((devsize - 8*2 ) & ~(4*2-1));
1266 case 1:
1267 /* at start, 4K for superblock and possible bitmap */
1268 return devsize - 4*2;
1269 case 2:
1270 /* 4k from start, 4K for superblock and possible bitmap */
1271 return devsize - (4+4)*2;
1272 }
1273 return 0;
1274 }
1275
1276 static int
1277 add_internal_bitmap1(struct supertype *st,
1278 int *chunkp, int delay, int write_behind,
1279 unsigned long long size,
1280 int may_change, int major)
1281 {
1282 /*
1283 * If not may_change, then this is a 'Grow', and the bitmap
1284 * must fit after the superblock.
1285 * If may_change, then this is create, and we can put the bitmap
1286 * before the superblock if we like, or may move the start.
1287 * If !may_change, the bitmap MUST live at offset of 1K, until
1288 * we get a sysfs interface.
1289 *
1290 * size is in sectors, chunk is in bytes !!!
1291 */
1292
1293 unsigned long long bits;
1294 unsigned long long max_bits;
1295 unsigned long long min_chunk;
1296 long offset;
1297 int chunk = *chunkp;
1298 int room = 0;
1299 struct mdp_superblock_1 *sb = st->sb;
1300 bitmap_super_t *bms = (bitmap_super_t*)(((char*)sb) + 1024);
1301
1302 switch(st->minor_version) {
1303 case 0:
1304 /* either 3K after the superblock, or some amount of space
1305 * before.
1306 */
1307 if (may_change) {
1308 /* We are creating array, so we *know* how much room has
1309 * been left.
1310 */
1311 offset = 0;
1312 room = choose_bm_space(__le64_to_cpu(sb->size));
1313 if (room == 4*2) {
1314 /* make it 3K after the superblock */
1315 room = 3*2;
1316 offset = 2;
1317 }
1318 } else {
1319 room = __le64_to_cpu(sb->super_offset)
1320 - __le64_to_cpu(sb->data_offset)
1321 - __le64_to_cpu(sb->data_size);
1322 /* remove '1 ||' when we can set offset via sysfs */
1323 if (1 || (room < 3*2 &&
1324 __le32_to_cpu(sb->max_dev) <= 384)) {
1325 room = 3*2;
1326 offset = 1*2;
1327 } else {
1328 offset = 0; /* means movable offset */
1329 }
1330 }
1331 break;
1332 case 1:
1333 case 2: /* between superblock and data */
1334 if (may_change) {
1335 offset = 4*2;
1336 room = choose_bm_space(__le64_to_cpu(sb->size));
1337 } else {
1338 room = __le64_to_cpu(sb->data_offset)
1339 - __le64_to_cpu(sb->super_offset);
1340 if (1 || __le32_to_cpu(sb->max_dev) <= 384) {
1341 room -= 2;
1342 offset = 2;
1343 } else {
1344 room -= 4*2;
1345 offset = 4*2;
1346 }
1347 }
1348 break;
1349 default:
1350 return 0;
1351 }
1352
1353 if (chunk == UnSet && room > 128*2)
1354 /* Limit to 128K of bitmap when chunk size not requested */
1355 room = 128*2;
1356
1357 max_bits = (room * 512 - sizeof(bitmap_super_t)) * 8;
1358
1359 min_chunk = 4096; /* sub-page chunks don't work yet.. */
1360 bits = (size*512)/min_chunk +1;
1361 while (bits > max_bits) {
1362 min_chunk *= 2;
1363 bits = (bits+1)/2;
1364 }
1365 if (chunk == UnSet)
1366 chunk = min_chunk;
1367 else if (chunk < min_chunk)
1368 return 0; /* chunk size too small */
1369 if (chunk == 0) /* rounding problem */
1370 return 0;
1371
1372 if (offset == 0) {
1373 bits = (size*512) / chunk + 1;
1374 room = ((bits+7)/8 + sizeof(bitmap_super_t) +511)/512;
1375 offset = -room;
1376 }
1377
1378 sb->bitmap_offset = __cpu_to_le32(offset);
1379
1380 sb->feature_map = __cpu_to_le32(__le32_to_cpu(sb->feature_map) | 1);
1381 memset(bms, 0, sizeof(*bms));
1382 bms->magic = __cpu_to_le32(BITMAP_MAGIC);
1383 bms->version = __cpu_to_le32(major);
1384 uuid_from_super1(st, (int*)bms->uuid);
1385 bms->chunksize = __cpu_to_le32(chunk);
1386 bms->daemon_sleep = __cpu_to_le32(delay);
1387 bms->sync_size = __cpu_to_le64(size);
1388 bms->write_behind = __cpu_to_le32(write_behind);
1389
1390 *chunkp = chunk;
1391 return 1;
1392 }
1393
1394
1395 static void locate_bitmap1(struct supertype *st, int fd)
1396 {
1397 unsigned long long offset;
1398 struct mdp_superblock_1 *sb;
1399 int mustfree = 0;
1400
1401 if (!st->sb) {
1402 if (st->ss->load_super(st, fd, NULL))
1403 return; /* no error I hope... */
1404 mustfree = 1;
1405 }
1406 sb = st->sb;
1407
1408 offset = __le64_to_cpu(sb->super_offset);
1409 offset += (int32_t) __le32_to_cpu(sb->bitmap_offset);
1410 if (mustfree)
1411 free(sb);
1412 lseek64(fd, offset<<9, 0);
1413 }
1414
1415 static int write_bitmap1(struct supertype *st, int fd)
1416 {
1417 struct mdp_superblock_1 *sb = st->sb;
1418 bitmap_super_t *bms = (bitmap_super_t*)(((char*)sb)+1024);
1419 int rv = 0;
1420
1421 int towrite, n;
1422 char buf[4096];
1423
1424 locate_bitmap1(st, fd);
1425
1426 if (write(fd, ((char*)sb)+1024, sizeof(bitmap_super_t)) !=
1427 sizeof(bitmap_super_t))
1428 return -2;
1429 towrite = __le64_to_cpu(bms->sync_size) / (__le32_to_cpu(bms->chunksize)>>9);
1430 towrite = (towrite+7) >> 3; /* bits to bytes */
1431 memset(buf, 0xff, sizeof(buf));
1432 while (towrite > 0) {
1433 n = towrite;
1434 if (n > sizeof(buf))
1435 n = sizeof(buf);
1436 n = write(fd, buf, n);
1437 if (n > 0)
1438 towrite -= n;
1439 else
1440 break;
1441 }
1442 fsync(fd);
1443 if (towrite)
1444 rv = -2;
1445
1446 return rv;
1447 }
1448
1449 static void free_super1(struct supertype *st)
1450 {
1451 if (st->sb)
1452 free(st->sb);
1453 st->sb = NULL;
1454 }
1455
1456 static int validate_geometry1(struct supertype *st, int level,
1457 int layout, int raiddisks,
1458 int chunk, unsigned long long size,
1459 char *subdev, unsigned long long *freesize)
1460 {
1461 unsigned long long ldsize;
1462 int fd;
1463
1464 if (level == LEVEL_CONTAINER)
1465 return 0;
1466 if (!subdev)
1467 return 1;
1468
1469 fd = open(subdev, O_RDONLY|O_EXCL, 0);
1470 if (fd < 0) {
1471 fprintf(stderr, Name ": Cannot open %s: %s\n",
1472 subdev, strerror(errno));
1473 return 0;
1474 }
1475 if (!get_dev_size(fd, subdev, &ldsize)) {
1476 close(fd);
1477 return 0;
1478 }
1479 close(fd);
1480
1481 *freesize = avail_size1(st, ldsize >> 9);
1482 return 1;
1483 }
1484
1485 struct superswitch super1 = {
1486 #ifndef MDASSEMBLE
1487 .examine_super = examine_super1,
1488 .brief_examine_super = brief_examine_super1,
1489 .export_examine_super = export_examine_super1,
1490 .detail_super = detail_super1,
1491 .brief_detail_super = brief_detail_super1,
1492 .export_detail_super = export_detail_super1,
1493 .write_init_super = write_init_super1,
1494 #endif
1495 .match_home = match_home1,
1496 .uuid_from_super = uuid_from_super1,
1497 .getinfo_super = getinfo_super1,
1498 .update_super = update_super1,
1499 .init_super = init_super1,
1500 .add_to_super = add_to_super1,
1501 .store_super = store_super1,
1502 .compare_super = compare_super1,
1503 .load_super = load_super1,
1504 .match_metadata_desc = match_metadata_desc1,
1505 .avail_size = avail_size1,
1506 .add_internal_bitmap = add_internal_bitmap1,
1507 .locate_bitmap = locate_bitmap1,
1508 .write_bitmap = write_bitmap1,
1509 .free_super = free_super1,
1510 .validate_geometry = validate_geometry1,
1511 #if __BYTE_ORDER == BIG_ENDIAN
1512 .swapuuid = 0,
1513 #else
1514 .swapuuid = 1,
1515 #endif
1516 };
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