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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 info->safe_mode_delay = 200;
536
537 memcpy(info->uuid, sb->set_uuid, 16);
538
539 strncpy(info->name, sb->set_name, 32);
540 info->name[32] = 0;
541
542 if (sb->feature_map & __le32_to_cpu(MD_FEATURE_RESHAPE_ACTIVE)) {
543 info->reshape_active = 1;
544 info->reshape_progress = __le64_to_cpu(sb->reshape_position);
545 info->new_level = __le32_to_cpu(sb->new_level);
546 info->delta_disks = __le32_to_cpu(sb->delta_disks);
547 info->new_layout = __le32_to_cpu(sb->new_layout);
548 info->new_chunk = __le32_to_cpu(sb->new_chunk)<<9;
549 } else
550 info->reshape_active = 0;
551
552 for (i=0; i< __le32_to_cpu(sb->max_dev); i++) {
553 role = __le16_to_cpu(sb->dev_roles[i]);
554 if (/*role == 0xFFFF || */role < info->array.raid_disks)
555 working++;
556 }
557
558 info->array.working_disks = working;
559 }
560
561 static int update_super1(struct supertype *st, struct mdinfo *info,
562 char *update,
563 char *devname, int verbose,
564 int uuid_set, char *homehost)
565 {
566 /* NOTE: for 'assemble' and 'force' we need to return non-zero if any change was made.
567 * For others, the return value is ignored.
568 */
569 int rv = 0;
570 struct mdp_superblock_1 *sb = st->sb;
571
572 if (strcmp(update, "force-one")==0) {
573 /* Not enough devices for a working array,
574 * so bring this one up-to-date
575 */
576 if (sb->events != __cpu_to_le64(info->events))
577 rv = 1;
578 sb->events = __cpu_to_le64(info->events);
579 }
580 if (strcmp(update, "force-array")==0) {
581 /* Degraded array and 'force' requests to
582 * maybe need to mark it 'clean'.
583 */
584 switch(__le32_to_cpu(sb->level)) {
585 case 5: case 4: case 6:
586 /* need to force clean */
587 if (sb->resync_offset != ~0ULL)
588 rv = 1;
589 sb->resync_offset = ~0ULL;
590 }
591 }
592 if (strcmp(update, "assemble")==0) {
593 int d = info->disk.number;
594 int want;
595 if (info->disk.state == 6)
596 want = __cpu_to_le32(info->disk.raid_disk);
597 else
598 want = 0xFFFF;
599 if (sb->dev_roles[d] != want) {
600 sb->dev_roles[d] = want;
601 rv = 1;
602 }
603 }
604 if (strcmp(update, "linear-grow-new") == 0) {
605 int i;
606 int rfd;
607 int max = __le32_to_cpu(sb->max_dev);
608
609 for (i=0 ; i < max ; i++)
610 if (__le16_to_cpu(sb->dev_roles[i]) >= 0xfffe)
611 break;
612 sb->dev_number = __cpu_to_le32(i);
613 info->disk.number = i;
614 if (max >= __le32_to_cpu(sb->max_dev))
615 sb->max_dev = __cpu_to_le32(max+1);
616
617 if ((rfd = open("/dev/urandom", O_RDONLY)) < 0 ||
618 read(rfd, sb->device_uuid, 16) != 16) {
619 *(__u32*)(sb->device_uuid) = random();
620 *(__u32*)(sb->device_uuid+4) = random();
621 *(__u32*)(sb->device_uuid+8) = random();
622 *(__u32*)(sb->device_uuid+12) = random();
623 }
624
625 sb->dev_roles[i] =
626 __cpu_to_le16(info->disk.raid_disk);
627 }
628 if (strcmp(update, "linear-grow-update") == 0) {
629 sb->raid_disks = __cpu_to_le32(info->array.raid_disks);
630 sb->dev_roles[info->disk.number] =
631 __cpu_to_le16(info->disk.raid_disk);
632 }
633 if (strcmp(update, "resync") == 0) {
634 /* make sure resync happens */
635 sb->resync_offset = 0ULL;
636 }
637 if (strcmp(update, "uuid") == 0) {
638 copy_uuid(sb->set_uuid, info->uuid, super1.swapuuid);
639
640 if (__le32_to_cpu(sb->feature_map)&MD_FEATURE_BITMAP_OFFSET) {
641 struct bitmap_super_s *bm;
642 bm = (struct bitmap_super_s*)(st->sb+1024);
643 memcpy(bm->uuid, sb->set_uuid, 16);
644 }
645 }
646 if (strcmp(update, "homehost") == 0 &&
647 homehost) {
648 char *c;
649 update = "name";
650 c = strchr(sb->set_name, ':');
651 if (c)
652 strncpy(info->name, c+1, 31 - (c-sb->set_name));
653 else
654 strncpy(info->name, sb->set_name, 32);
655 info->name[32] = 0;
656 }
657 if (strcmp(update, "name") == 0) {
658 if (info->name[0] == 0)
659 sprintf(info->name, "%d", info->array.md_minor);
660 memset(sb->set_name, 0, sizeof(sb->set_name));
661 if (homehost &&
662 strchr(info->name, ':') == NULL &&
663 strlen(homehost)+1+strlen(info->name) < 32) {
664 strcpy(sb->set_name, homehost);
665 strcat(sb->set_name, ":");
666 strcat(sb->set_name, info->name);
667 } else
668 strcpy(sb->set_name, info->name);
669 }
670 if (strcmp(update, "devicesize") == 0 &&
671 __le64_to_cpu(sb->super_offset) <
672 __le64_to_cpu(sb->data_offset)) {
673 /* set data_size to device size less data_offset */
674 struct misc_dev_info *misc = (struct misc_dev_info*)
675 (st->sb + 1024 + 512);
676 printf("Size was %llu\n", (unsigned long long)
677 __le64_to_cpu(sb->data_size));
678 sb->data_size = __cpu_to_le64(
679 misc->device_size - __le64_to_cpu(sb->data_offset));
680 printf("Size is %llu\n", (unsigned long long)
681 __le64_to_cpu(sb->data_size));
682 }
683 if (strcmp(update, "_reshape_progress")==0)
684 sb->reshape_position = __cpu_to_le64(info->reshape_progress);
685
686 sb->sb_csum = calc_sb_1_csum(sb);
687 return rv;
688 }
689
690 static int init_super1(struct supertype *st, mdu_array_info_t *info,
691 unsigned long long size, char *name, char *homehost, int *uuid)
692 {
693 struct mdp_superblock_1 *sb;
694 int spares;
695 int rfd;
696 char defname[10];
697
698 posix_memalign((void**)&sb, 512, (1024 + 512 +
699 sizeof(struct misc_dev_info)));
700 memset(sb, 0, 1024);
701
702 st->sb = sb;
703 if (info == NULL) {
704 /* zeroing superblock */
705 return 0;
706 }
707
708 spares = info->working_disks - info->active_disks;
709 if (info->raid_disks + spares > 384) {
710 fprintf(stderr, Name ": too many devices requested: %d+%d > %d\n",
711 info->raid_disks , spares, 384);
712 return 0;
713 }
714
715 sb->magic = __cpu_to_le32(MD_SB_MAGIC);
716 sb->major_version = __cpu_to_le32(1);
717 sb->feature_map = 0;
718 sb->pad0 = 0;
719
720 if (uuid)
721 copy_uuid(sb->set_uuid, uuid, super1.swapuuid);
722 else {
723 if ((rfd = open("/dev/urandom", O_RDONLY)) < 0 ||
724 read(rfd, sb->set_uuid, 16) != 16) {
725 *(__u32*)(sb->set_uuid) = random();
726 *(__u32*)(sb->set_uuid+4) = random();
727 *(__u32*)(sb->set_uuid+8) = random();
728 *(__u32*)(sb->set_uuid+12) = random();
729 }
730 if (rfd >= 0) close(rfd);
731 }
732
733 if (name == NULL || *name == 0) {
734 sprintf(defname, "%d", info->md_minor);
735 name = defname;
736 }
737 memset(sb->set_name, 0, 32);
738 if (homehost &&
739 strchr(name, ':')== NULL &&
740 strlen(homehost)+1+strlen(name) < 32) {
741 strcpy(sb->set_name, homehost);
742 strcat(sb->set_name, ":");
743 strcat(sb->set_name, name);
744 } else
745 strcpy(sb->set_name, name);
746
747 sb->ctime = __cpu_to_le64((unsigned long long)time(0));
748 sb->level = __cpu_to_le32(info->level);
749 sb->layout = __cpu_to_le32(info->layout);
750 sb->size = __cpu_to_le64(size*2ULL);
751 sb->chunksize = __cpu_to_le32(info->chunk_size>>9);
752 sb->raid_disks = __cpu_to_le32(info->raid_disks);
753
754 sb->data_offset = __cpu_to_le64(0);
755 sb->data_size = __cpu_to_le64(0);
756 sb->super_offset = __cpu_to_le64(0);
757 sb->recovery_offset = __cpu_to_le64(0);
758
759 sb->utime = sb->ctime;
760 sb->events = __cpu_to_le64(1);
761 if (info->state & (1<<MD_SB_CLEAN))
762 sb->resync_offset = ~0ULL;
763 else
764 sb->resync_offset = 0;
765 sb->max_dev = __cpu_to_le32((1024- sizeof(struct mdp_superblock_1))/
766 sizeof(sb->dev_roles[0]));
767 memset(sb->pad3, 0, sizeof(sb->pad3));
768
769 memset(sb->dev_roles, 0xff, 1024 - sizeof(struct mdp_superblock_1));
770
771 return 1;
772 }
773
774 struct devinfo {
775 int fd;
776 char *devname;
777 mdu_disk_info_t disk;
778 struct devinfo *next;
779 };
780 #ifndef MDASSEMBLE
781 /* Add a device to the superblock being created */
782 static void add_to_super1(struct supertype *st, mdu_disk_info_t *dk,
783 int fd, char *devname)
784 {
785 struct mdp_superblock_1 *sb = st->sb;
786 __u16 *rp = sb->dev_roles + dk->number;
787 struct devinfo *di, **dip;
788
789 if ((dk->state & 6) == 6) /* active, sync */
790 *rp = __cpu_to_le16(dk->raid_disk);
791 else if ((dk->state & ~2) == 0) /* active or idle -> spare */
792 *rp = 0xffff;
793 else
794 *rp = 0xfffe;
795
796 sb->dev_number = __cpu_to_le32(dk->number);
797 sb->sb_csum = calc_sb_1_csum(sb);
798
799 dip = (struct devinfo **)&st->info;
800 while (*dip)
801 dip = &(*dip)->next;
802 di = malloc(sizeof(struct devinfo));
803 di->fd = fd;
804 di->devname = devname;
805 di->disk = *dk;
806 di->next = NULL;
807 *dip = di;
808 }
809 #endif
810
811 static void locate_bitmap1(struct supertype *st, int fd);
812
813 static int store_super1(struct supertype *st, int fd)
814 {
815 struct mdp_superblock_1 *sb = st->sb;
816 unsigned long long sb_offset;
817 int sbsize;
818 unsigned long long dsize;
819
820 if (!get_dev_size(fd, NULL, &dsize))
821 return 1;
822
823 dsize >>= 9;
824
825 if (dsize < 24)
826 return 2;
827
828 /*
829 * Calculate the position of the superblock.
830 * It is always aligned to a 4K boundary and
831 * depending on minor_version, it can be:
832 * 0: At least 8K, but less than 12K, from end of device
833 * 1: At start of device
834 * 2: 4K from start of device.
835 */
836 switch(st->minor_version) {
837 case 0:
838 sb_offset = dsize;
839 sb_offset -= 8*2;
840 sb_offset &= ~(4*2-1);
841 break;
842 case 1:
843 sb_offset = 0;
844 break;
845 case 2:
846 sb_offset = 4*2;
847 break;
848 default:
849 return -EINVAL;
850 }
851
852
853
854 if (sb_offset != __le64_to_cpu(sb->super_offset) &&
855 0 != __le64_to_cpu(sb->super_offset)
856 ) {
857 fprintf(stderr, Name ": internal error - sb_offset is wrong\n");
858 abort();
859 }
860
861 if (lseek64(fd, sb_offset << 9, 0)< 0LL)
862 return 3;
863
864 sbsize = sizeof(*sb) + 2 * __le32_to_cpu(sb->max_dev);
865 sbsize = (sbsize+511)&(~511UL);
866
867 if (write(fd, sb, sbsize) != sbsize)
868 return 4;
869
870 if (sb->feature_map & __cpu_to_le32(MD_FEATURE_BITMAP_OFFSET)) {
871 struct bitmap_super_s *bm = (struct bitmap_super_s*)
872 (((char*)sb)+1024);
873 if (__le32_to_cpu(bm->magic) == BITMAP_MAGIC) {
874 locate_bitmap1(st, fd);
875 if (write(fd, bm, ROUND_UP(sizeof(*bm),512)) !=
876 ROUND_UP(sizeof(*bm),512))
877 return 5;
878 }
879 }
880 fsync(fd);
881 return 0;
882 }
883
884 static int load_super1(struct supertype *st, int fd, char *devname);
885
886 static unsigned long choose_bm_space(unsigned long devsize)
887 {
888 /* if the device is bigger than 8Gig, save 64k for bitmap usage,
889 * if bigger than 200Gig, save 128k
890 */
891 if (devsize < 64*2) return 0;
892 if (devsize - 64*2 >= 200*1024*1024*2)
893 return 128*2;
894 if (devsize - 4*2 > 8*1024*1024*2)
895 return 64*2;
896 return 4*2;
897 }
898
899 #ifndef MDASSEMBLE
900 static int write_init_super1(struct supertype *st)
901 {
902 struct mdp_superblock_1 *sb = st->sb;
903 struct supertype refst;
904 int rfd;
905 int rv = 0;
906 int bm_space;
907 struct devinfo *di;
908 unsigned long long dsize, array_size;
909 long long sb_offset;
910
911 for (di = st->info; di && ! rv ; di = di->next) {
912 if (di->disk.state == 1)
913 continue;
914 if (di->fd < 0)
915 continue;
916
917 Kill(di->devname, 0, 1, 1);
918 Kill(di->devname, 0, 1, 1);
919
920 sb->dev_number = __cpu_to_le32(di->disk.number);
921 if (di->disk.state & (1<<MD_DISK_WRITEMOSTLY))
922 sb->devflags |= __cpu_to_le32(WriteMostly1);
923
924 if ((rfd = open("/dev/urandom", O_RDONLY)) < 0 ||
925 read(rfd, sb->device_uuid, 16) != 16) {
926 *(__u32*)(sb->device_uuid) = random();
927 *(__u32*)(sb->device_uuid+4) = random();
928 *(__u32*)(sb->device_uuid+8) = random();
929 *(__u32*)(sb->device_uuid+12) = random();
930 }
931 if (rfd >= 0) close(rfd);
932 sb->events = 0;
933
934 refst =*st;
935 refst.sb = NULL;
936 if (load_super1(&refst, di->fd, NULL)==0) {
937 struct mdp_superblock_1 *refsb = refst.sb;
938
939 memcpy(sb->device_uuid, refsb->device_uuid, 16);
940 if (memcmp(sb->set_uuid, refsb->set_uuid, 16)==0) {
941 /* same array, so preserve events and
942 * dev_number */
943 sb->events = refsb->events;
944 /* bugs in 2.6.17 and earlier mean the
945 * dev_number chosen in Manage must be preserved
946 */
947 if (get_linux_version() >= 2006018)
948 sb->dev_number = refsb->dev_number;
949 }
950 free(refsb);
951 }
952
953 if (!get_dev_size(di->fd, NULL, &dsize))
954 return 1;
955 dsize >>= 9;
956
957 if (dsize < 24) {
958 close(di->fd);
959 return 2;
960 }
961
962
963 /*
964 * Calculate the position of the superblock.
965 * It is always aligned to a 4K boundary and
966 * depending on minor_version, it can be:
967 * 0: At least 8K, but less than 12K, from end of device
968 * 1: At start of device
969 * 2: 4K from start of device.
970 * Depending on the array size, we might leave extra space
971 * for a bitmap.
972 */
973 array_size = __le64_to_cpu(sb->size);
974 /* work out how much space we left for a bitmap */
975 bm_space = choose_bm_space(array_size);
976
977 switch(st->minor_version) {
978 case 0:
979 sb_offset = dsize;
980 sb_offset -= 8*2;
981 sb_offset &= ~(4*2-1);
982 sb->super_offset = __cpu_to_le64(sb_offset);
983 sb->data_offset = __cpu_to_le64(0);
984 if (sb_offset - bm_space < array_size)
985 bm_space = sb_offset - array_size;
986 sb->data_size = __cpu_to_le64(sb_offset - bm_space);
987 break;
988 case 1:
989 sb->super_offset = __cpu_to_le64(0);
990 if (4*2 + bm_space + __le64_to_cpu(sb->size) > dsize)
991 bm_space = dsize - __le64_to_cpu(sb->size) -4*2;
992 sb->data_offset = __cpu_to_le64(bm_space + 4*2);
993 sb->data_size = __cpu_to_le64(dsize - bm_space - 4*2);
994 break;
995 case 2:
996 sb_offset = 4*2;
997 sb->super_offset = __cpu_to_le64(4*2);
998 if (4*2 + 4*2 + bm_space + __le64_to_cpu(sb->size)
999 > dsize)
1000 bm_space = dsize - __le64_to_cpu(sb->size)
1001 - 4*2 - 4*2;
1002 sb->data_offset = __cpu_to_le64(4*2 + 4*2 + bm_space);
1003 sb->data_size = __cpu_to_le64(dsize - 4*2 - 4*2
1004 - bm_space );
1005 break;
1006 default:
1007 return -EINVAL;
1008 }
1009
1010
1011 sb->sb_csum = calc_sb_1_csum(sb);
1012 rv = store_super1(st, di->fd);
1013 if (rv)
1014 fprintf(stderr,
1015 Name ": failed to write superblock to %s\n",
1016 di->devname);
1017
1018 if (rv == 0 && (__le32_to_cpu(sb->feature_map) & 1))
1019 rv = st->ss->write_bitmap(st, di->fd);
1020 close(di->fd);
1021 di->fd = -1;
1022 }
1023 return rv;
1024 }
1025 #endif
1026
1027 static int compare_super1(struct supertype *st, struct supertype *tst)
1028 {
1029 /*
1030 * return:
1031 * 0 same, or first was empty, and second was copied
1032 * 1 second had wrong number
1033 * 2 wrong uuid
1034 * 3 wrong other info
1035 */
1036 struct mdp_superblock_1 *first = st->sb;
1037 struct mdp_superblock_1 *second = tst->sb;
1038
1039 if (second->magic != __cpu_to_le32(MD_SB_MAGIC))
1040 return 1;
1041 if (second->major_version != __cpu_to_le32(1))
1042 return 1;
1043
1044 if (!first) {
1045 posix_memalign((void**)&first, 512,
1046 1024 + 512 +
1047 sizeof(struct misc_dev_info));
1048 memcpy(first, second, 1024 + 512 +
1049 sizeof(struct misc_dev_info));
1050 st->sb = first;
1051 return 0;
1052 }
1053 if (memcmp(first->set_uuid, second->set_uuid, 16)!= 0)
1054 return 2;
1055
1056 if (first->ctime != second->ctime ||
1057 first->level != second->level ||
1058 first->layout != second->layout ||
1059 first->size != second->size ||
1060 first->chunksize != second->chunksize ||
1061 first->raid_disks != second->raid_disks)
1062 return 3;
1063 return 0;
1064 }
1065
1066 static void free_super1(struct supertype *st);
1067
1068 static int load_super1(struct supertype *st, int fd, char *devname)
1069 {
1070 unsigned long long dsize;
1071 unsigned long long sb_offset;
1072 struct mdp_superblock_1 *super;
1073 int uuid[4];
1074 struct bitmap_super_s *bsb;
1075 struct misc_dev_info *misc;
1076
1077 free_super1(st);
1078
1079 if (st->subarray[0])
1080 return 1;
1081
1082 if (st->ss == NULL || st->minor_version == -1) {
1083 int bestvers = -1;
1084 struct supertype tst;
1085 __u64 bestctime = 0;
1086 /* guess... choose latest ctime */
1087 memset(&tst, 0, sizeof(tst));
1088 tst.ss = &super1;
1089 for (tst.minor_version = 0; tst.minor_version <= 2 ; tst.minor_version++) {
1090 switch(load_super1(&tst, fd, devname)) {
1091 case 0: super = tst.sb;
1092 if (bestvers == -1 ||
1093 bestctime < __le64_to_cpu(super->ctime)) {
1094 bestvers = tst.minor_version;
1095 bestctime = __le64_to_cpu(super->ctime);
1096 }
1097 free(super);
1098 tst.sb = NULL;
1099 break;
1100 case 1: return 1; /*bad device */
1101 case 2: break; /* bad, try next */
1102 }
1103 }
1104 if (bestvers != -1) {
1105 int rv;
1106 tst.minor_version = bestvers;
1107 tst.ss = &super1;
1108 tst.max_devs = 384;
1109 rv = load_super1(&tst, fd, devname);
1110 if (rv == 0)
1111 *st = tst;
1112 return rv;
1113 }
1114 return 2;
1115 }
1116 if (!get_dev_size(fd, devname, &dsize))
1117 return 1;
1118 dsize >>= 9;
1119
1120 if (dsize < 24) {
1121 if (devname)
1122 fprintf(stderr, Name ": %s is too small for md: size is %llu sectors.\n",
1123 devname, dsize);
1124 return 1;
1125 }
1126
1127 /*
1128 * Calculate the position of the superblock.
1129 * It is always aligned to a 4K boundary and
1130 * depending on minor_version, it can be:
1131 * 0: At least 8K, but less than 12K, from end of device
1132 * 1: At start of device
1133 * 2: 4K from start of device.
1134 */
1135 switch(st->minor_version) {
1136 case 0:
1137 sb_offset = dsize;
1138 sb_offset -= 8*2;
1139 sb_offset &= ~(4*2-1);
1140 break;
1141 case 1:
1142 sb_offset = 0;
1143 break;
1144 case 2:
1145 sb_offset = 4*2;
1146 break;
1147 default:
1148 return -EINVAL;
1149 }
1150
1151 ioctl(fd, BLKFLSBUF, 0); /* make sure we read current data */
1152
1153
1154 if (lseek64(fd, sb_offset << 9, 0)< 0LL) {
1155 if (devname)
1156 fprintf(stderr, Name ": Cannot seek to superblock on %s: %s\n",
1157 devname, strerror(errno));
1158 return 1;
1159 }
1160
1161 posix_memalign((void**)&super, 512,
1162 1024 + 512 +
1163 sizeof(struct misc_dev_info));
1164
1165 if (read(fd, super, 1024) != 1024) {
1166 if (devname)
1167 fprintf(stderr, Name ": Cannot read superblock on %s\n",
1168 devname);
1169 free(super);
1170 return 1;
1171 }
1172
1173 if (__le32_to_cpu(super->magic) != MD_SB_MAGIC) {
1174 if (devname)
1175 fprintf(stderr, Name ": No super block found on %s (Expected magic %08x, got %08x)\n",
1176 devname, MD_SB_MAGIC, __le32_to_cpu(super->magic));
1177 free(super);
1178 return 2;
1179 }
1180
1181 if (__le32_to_cpu(super->major_version) != 1) {
1182 if (devname)
1183 fprintf(stderr, Name ": Cannot interpret superblock on %s - version is %d\n",
1184 devname, __le32_to_cpu(super->major_version));
1185 free(super);
1186 return 2;
1187 }
1188 if (__le64_to_cpu(super->super_offset) != sb_offset) {
1189 if (devname)
1190 fprintf(stderr, Name ": No superblock found on %s (super_offset is wrong)\n",
1191 devname);
1192 free(super);
1193 return 2;
1194 }
1195 st->sb = super;
1196
1197 bsb = (struct bitmap_super_s *)(((char*)super)+1024);
1198
1199 misc = (struct misc_dev_info*) (((char*)super)+1024+512);
1200 misc->device_size = dsize;
1201
1202 /* Now check on the bitmap superblock */
1203 if ((__le32_to_cpu(super->feature_map)&MD_FEATURE_BITMAP_OFFSET) == 0)
1204 return 0;
1205 /* Read the bitmap superblock and make sure it looks
1206 * valid. If it doesn't clear the bit. An --assemble --force
1207 * should get that written out.
1208 */
1209 locate_bitmap1(st, fd);
1210 if (read(fd, ((char*)super)+1024, 512)
1211 != 512)
1212 goto no_bitmap;
1213
1214 uuid_from_super1(st, uuid);
1215 if (__le32_to_cpu(bsb->magic) != BITMAP_MAGIC ||
1216 memcmp(bsb->uuid, uuid, 16) != 0)
1217 goto no_bitmap;
1218 return 0;
1219
1220 no_bitmap:
1221 super->feature_map = __cpu_to_le32(__le32_to_cpu(super->feature_map) & ~1);
1222 return 0;
1223 }
1224
1225
1226 static struct supertype *match_metadata_desc1(char *arg)
1227 {
1228 struct supertype *st = malloc(sizeof(*st));
1229 if (!st) return st;
1230
1231 memset(st, 0, sizeof(*st));
1232 st->ss = &super1;
1233 st->max_devs = 384;
1234 st->sb = NULL;
1235 if (strcmp(arg, "1.0") == 0) {
1236 st->minor_version = 0;
1237 return st;
1238 }
1239 if (strcmp(arg, "1.1") == 0) {
1240 st->minor_version = 1;
1241 return st;
1242 }
1243 if (strcmp(arg, "1.2") == 0) {
1244 st->minor_version = 2;
1245 return st;
1246 }
1247 if (strcmp(arg, "1") == 0 ||
1248 strcmp(arg, "default") == 0) {
1249 st->minor_version = -1;
1250 return st;
1251 }
1252
1253 free(st);
1254 return NULL;
1255 }
1256
1257 /* find available size on device with this devsize, using
1258 * superblock type st, and reserving 'reserve' sectors for
1259 * a possible bitmap
1260 */
1261 static __u64 avail_size1(struct supertype *st, __u64 devsize)
1262 {
1263 if (devsize < 24)
1264 return 0;
1265
1266 devsize -= choose_bm_space(devsize);
1267
1268 switch(st->minor_version) {
1269 case -1: /* no specified. Now time to set default */
1270 st->minor_version = 0;
1271 /* FALL THROUGH */
1272 case 0:
1273 /* at end */
1274 return ((devsize - 8*2 ) & ~(4*2-1));
1275 case 1:
1276 /* at start, 4K for superblock and possible bitmap */
1277 return devsize - 4*2;
1278 case 2:
1279 /* 4k from start, 4K for superblock and possible bitmap */
1280 return devsize - (4+4)*2;
1281 }
1282 return 0;
1283 }
1284
1285 static int
1286 add_internal_bitmap1(struct supertype *st,
1287 int *chunkp, int delay, int write_behind,
1288 unsigned long long size,
1289 int may_change, int major)
1290 {
1291 /*
1292 * If not may_change, then this is a 'Grow', and the bitmap
1293 * must fit after the superblock.
1294 * If may_change, then this is create, and we can put the bitmap
1295 * before the superblock if we like, or may move the start.
1296 * If !may_change, the bitmap MUST live at offset of 1K, until
1297 * we get a sysfs interface.
1298 *
1299 * size is in sectors, chunk is in bytes !!!
1300 */
1301
1302 unsigned long long bits;
1303 unsigned long long max_bits;
1304 unsigned long long min_chunk;
1305 long offset;
1306 int chunk = *chunkp;
1307 int room = 0;
1308 struct mdp_superblock_1 *sb = st->sb;
1309 bitmap_super_t *bms = (bitmap_super_t*)(((char*)sb) + 1024);
1310
1311 switch(st->minor_version) {
1312 case 0:
1313 /* either 3K after the superblock, or some amount of space
1314 * before.
1315 */
1316 if (may_change) {
1317 /* We are creating array, so we *know* how much room has
1318 * been left.
1319 */
1320 offset = 0;
1321 room = choose_bm_space(__le64_to_cpu(sb->size));
1322 if (room == 4*2) {
1323 /* make it 3K after the superblock */
1324 room = 3*2;
1325 offset = 2;
1326 }
1327 } else {
1328 room = __le64_to_cpu(sb->super_offset)
1329 - __le64_to_cpu(sb->data_offset)
1330 - __le64_to_cpu(sb->data_size);
1331 /* remove '1 ||' when we can set offset via sysfs */
1332 if (1 || (room < 3*2 &&
1333 __le32_to_cpu(sb->max_dev) <= 384)) {
1334 room = 3*2;
1335 offset = 1*2;
1336 } else {
1337 offset = 0; /* means movable offset */
1338 }
1339 }
1340 break;
1341 case 1:
1342 case 2: /* between superblock and data */
1343 if (may_change) {
1344 offset = 4*2;
1345 room = choose_bm_space(__le64_to_cpu(sb->size));
1346 } else {
1347 room = __le64_to_cpu(sb->data_offset)
1348 - __le64_to_cpu(sb->super_offset);
1349 if (1 || __le32_to_cpu(sb->max_dev) <= 384) {
1350 room -= 2;
1351 offset = 2;
1352 } else {
1353 room -= 4*2;
1354 offset = 4*2;
1355 }
1356 }
1357 break;
1358 default:
1359 return 0;
1360 }
1361
1362 if (chunk == UnSet && room > 128*2)
1363 /* Limit to 128K of bitmap when chunk size not requested */
1364 room = 128*2;
1365
1366 max_bits = (room * 512 - sizeof(bitmap_super_t)) * 8;
1367
1368 min_chunk = 4096; /* sub-page chunks don't work yet.. */
1369 bits = (size*512)/min_chunk +1;
1370 while (bits > max_bits) {
1371 min_chunk *= 2;
1372 bits = (bits+1)/2;
1373 }
1374 if (chunk == UnSet)
1375 chunk = min_chunk;
1376 else if (chunk < min_chunk)
1377 return 0; /* chunk size too small */
1378 if (chunk == 0) /* rounding problem */
1379 return 0;
1380
1381 if (offset == 0) {
1382 bits = (size*512) / chunk + 1;
1383 room = ((bits+7)/8 + sizeof(bitmap_super_t) +511)/512;
1384 offset = -room;
1385 }
1386
1387 sb->bitmap_offset = __cpu_to_le32(offset);
1388
1389 sb->feature_map = __cpu_to_le32(__le32_to_cpu(sb->feature_map) | 1);
1390 memset(bms, 0, sizeof(*bms));
1391 bms->magic = __cpu_to_le32(BITMAP_MAGIC);
1392 bms->version = __cpu_to_le32(major);
1393 uuid_from_super1(st, (int*)bms->uuid);
1394 bms->chunksize = __cpu_to_le32(chunk);
1395 bms->daemon_sleep = __cpu_to_le32(delay);
1396 bms->sync_size = __cpu_to_le64(size);
1397 bms->write_behind = __cpu_to_le32(write_behind);
1398
1399 *chunkp = chunk;
1400 return 1;
1401 }
1402
1403
1404 static void locate_bitmap1(struct supertype *st, int fd)
1405 {
1406 unsigned long long offset;
1407 struct mdp_superblock_1 *sb;
1408 int mustfree = 0;
1409
1410 if (!st->sb) {
1411 if (st->ss->load_super(st, fd, NULL))
1412 return; /* no error I hope... */
1413 mustfree = 1;
1414 }
1415 sb = st->sb;
1416
1417 offset = __le64_to_cpu(sb->super_offset);
1418 offset += (int32_t) __le32_to_cpu(sb->bitmap_offset);
1419 if (mustfree)
1420 free(sb);
1421 lseek64(fd, offset<<9, 0);
1422 }
1423
1424 static int write_bitmap1(struct supertype *st, int fd)
1425 {
1426 struct mdp_superblock_1 *sb = st->sb;
1427 bitmap_super_t *bms = (bitmap_super_t*)(((char*)sb)+1024);
1428 int rv = 0;
1429
1430 int towrite, n;
1431 char abuf[4096+512];
1432 char *buf = (char*)(((long)(abuf+512))&~511UL);
1433
1434 locate_bitmap1(st, fd);
1435
1436 memset(buf, 0xff, 4096);
1437 memcpy(buf, ((char*)sb)+1024, sizeof(bitmap_super_t));
1438
1439 towrite = __le64_to_cpu(bms->sync_size) / (__le32_to_cpu(bms->chunksize)>>9);
1440 towrite = (towrite+7) >> 3; /* bits to bytes */
1441 towrite += sizeof(bitmap_super_t);
1442 towrite = ROUND_UP(towrite, 512);
1443 while (towrite > 0) {
1444 n = towrite;
1445 if (n > 4096)
1446 n = 4096;
1447 n = write(fd, buf, n);
1448 if (n > 0)
1449 towrite -= n;
1450 else
1451 break;
1452 memset(buf, 0xff, 4096);
1453 }
1454 fsync(fd);
1455 if (towrite)
1456 rv = -2;
1457
1458 return rv;
1459 }
1460
1461 static void free_super1(struct supertype *st)
1462 {
1463 if (st->sb)
1464 free(st->sb);
1465 st->sb = NULL;
1466 }
1467
1468 #ifndef MDASSEMBLE
1469 static int validate_geometry1(struct supertype *st, int level,
1470 int layout, int raiddisks,
1471 int chunk, unsigned long long size,
1472 char *subdev, unsigned long long *freesize,
1473 int verbose)
1474 {
1475 unsigned long long ldsize;
1476 int fd;
1477
1478 if (level == LEVEL_CONTAINER)
1479 return 0;
1480 if (!subdev)
1481 return 1;
1482
1483 fd = open(subdev, O_RDONLY|O_EXCL, 0);
1484 if (fd < 0) {
1485 if (verbose)
1486 fprintf(stderr, Name ": super1.x cannot open %s: %s\n",
1487 subdev, strerror(errno));
1488 return 0;
1489 }
1490
1491 if (!get_dev_size(fd, subdev, &ldsize)) {
1492 close(fd);
1493 return 0;
1494 }
1495 close(fd);
1496
1497 *freesize = avail_size1(st, ldsize >> 9);
1498 return 1;
1499 }
1500 #endif /* MDASSEMBLE */
1501
1502 struct superswitch super1 = {
1503 #ifndef MDASSEMBLE
1504 .examine_super = examine_super1,
1505 .brief_examine_super = brief_examine_super1,
1506 .export_examine_super = export_examine_super1,
1507 .detail_super = detail_super1,
1508 .brief_detail_super = brief_detail_super1,
1509 .export_detail_super = export_detail_super1,
1510 .write_init_super = write_init_super1,
1511 .validate_geometry = validate_geometry1,
1512 .add_to_super = add_to_super1,
1513 #endif
1514 .match_home = match_home1,
1515 .uuid_from_super = uuid_from_super1,
1516 .getinfo_super = getinfo_super1,
1517 .update_super = update_super1,
1518 .init_super = init_super1,
1519 .store_super = store_super1,
1520 .compare_super = compare_super1,
1521 .load_super = load_super1,
1522 .match_metadata_desc = match_metadata_desc1,
1523 .avail_size = avail_size1,
1524 .add_internal_bitmap = add_internal_bitmap1,
1525 .locate_bitmap = locate_bitmap1,
1526 .write_bitmap = write_bitmap1,
1527 .free_super = free_super1,
1528 #if __BYTE_ORDER == BIG_ENDIAN
1529 .swapuuid = 0,
1530 #else
1531 .swapuuid = 1,
1532 #endif
1533 };
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