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[thirdparty/mdadm.git] / super1.c
1 /*
2 * mdadm - manage Linux "md" devices aka RAID arrays.
3 *
4 * Copyright (C) 2001-2009 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@suse.de>
23 */
24
25 #include "mdadm.h"
26 /*
27 * The version-1 superblock :
28 * All numeric fields are little-endian.
29 *
30 * total size: 256 bytes plus 2 per device.
31 * 1K allows 384 devices.
32 */
33 struct mdp_superblock_1 {
34 /* constant array information - 128 bytes */
35 __u32 magic; /* MD_SB_MAGIC: 0xa92b4efc - little endian */
36 __u32 major_version; /* 1 */
37 __u32 feature_map; /* 0 for now */
38 __u32 pad0; /* always set to 0 when writing */
39
40 __u8 set_uuid[16]; /* user-space generated. */
41 char set_name[32]; /* set and interpreted by user-space */
42
43 __u64 ctime; /* lo 40 bits are seconds, top 24 are microseconds or 0*/
44 __u32 level; /* -4 (multipath), -1 (linear), 0,1,4,5 */
45 __u32 layout; /* only for raid5 currently */
46 __u64 size; /* used size of component devices, in 512byte sectors */
47
48 __u32 chunksize; /* in 512byte sectors */
49 __u32 raid_disks;
50 __u32 bitmap_offset; /* sectors after start of superblock that bitmap starts
51 * NOTE: signed, so bitmap can be before superblock
52 * only meaningful of feature_map[0] is set.
53 */
54
55 /* These are only valid with feature bit '4' */
56 __u32 new_level; /* new level we are reshaping to */
57 __u64 reshape_position; /* next address in array-space for reshape */
58 __u32 delta_disks; /* change in number of raid_disks */
59 __u32 new_layout; /* new layout */
60 __u32 new_chunk; /* new chunk size (bytes) */
61 __u8 pad1[128-124]; /* set to 0 when written */
62
63 /* constant this-device information - 64 bytes */
64 __u64 data_offset; /* sector start of data, often 0 */
65 __u64 data_size; /* sectors in this device that can be used for data */
66 __u64 super_offset; /* sector start of this superblock */
67 __u64 recovery_offset;/* sectors before this offset (from data_offset) have been recovered */
68 __u32 dev_number; /* permanent identifier of this device - not role in raid */
69 __u32 cnt_corrected_read; /* number of read errors that were corrected by re-writing */
70 __u8 device_uuid[16]; /* user-space setable, ignored by kernel */
71 __u8 devflags; /* per-device flags. Only one defined...*/
72 #define WriteMostly1 1 /* mask for writemostly flag in above */
73 __u8 pad2[64-57]; /* set to 0 when writing */
74
75 /* array state information - 64 bytes */
76 __u64 utime; /* 40 bits second, 24 btes microseconds */
77 __u64 events; /* incremented when superblock updated */
78 __u64 resync_offset; /* data before this offset (from data_offset) known to be in sync */
79 __u32 sb_csum; /* checksum upto dev_roles[max_dev] */
80 __u32 max_dev; /* size of dev_roles[] array to consider */
81 __u8 pad3[64-32]; /* set to 0 when writing */
82
83 /* device state information. Indexed by dev_number.
84 * 2 bytes per device
85 * Note there are no per-device state flags. State information is rolled
86 * into the 'roles' value. If a device is spare or faulty, then it doesn't
87 * have a meaningful role.
88 */
89 __u16 dev_roles[0]; /* role in array, or 0xffff for a spare, or 0xfffe for faulty */
90 };
91
92 struct misc_dev_info {
93 __u64 device_size;
94 };
95
96 /* feature_map bits */
97 #define MD_FEATURE_BITMAP_OFFSET 1
98 #define MD_FEATURE_RECOVERY_OFFSET 2 /* recovery_offset is present and
99 * must be honoured
100 */
101 #define MD_FEATURE_RESHAPE_ACTIVE 4
102
103 #define MD_FEATURE_ALL (1|2|4)
104
105 #ifndef offsetof
106 #define offsetof(t,f) ((size_t)&(((t*)0)->f))
107 #endif
108 static unsigned int calc_sb_1_csum(struct mdp_superblock_1 * sb)
109 {
110 unsigned int disk_csum, csum;
111 unsigned long long newcsum;
112 int size = sizeof(*sb) + __le32_to_cpu(sb->max_dev)*2;
113 unsigned int *isuper = (unsigned int*)sb;
114 int i;
115
116 /* make sure I can count... */
117 if (offsetof(struct mdp_superblock_1,data_offset) != 128 ||
118 offsetof(struct mdp_superblock_1, utime) != 192 ||
119 sizeof(struct mdp_superblock_1) != 256) {
120 fprintf(stderr, "WARNING - superblock isn't sized correctly\n");
121 }
122
123 disk_csum = sb->sb_csum;
124 sb->sb_csum = 0;
125 newcsum = 0;
126 for (i=0; size>=4; size -= 4 ) {
127 newcsum += __le32_to_cpu(*isuper);
128 isuper++;
129 }
130
131 if (size == 2)
132 newcsum += __le16_to_cpu(*(unsigned short*) isuper);
133
134 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
135 sb->sb_csum = disk_csum;
136 return __cpu_to_le32(csum);
137 }
138
139 static char abuf[4096+4096];
140 static int aread(int fd, void *buf, int len)
141 {
142 /* aligned read.
143 * On devices with a 4K sector size, we need to read
144 * the full sector and copy relevant bits into
145 * the buffer
146 */
147 int bsize;
148 char *b;
149 int n;
150 if (ioctl(fd, BLKSSZGET, &bsize) != 0 ||
151 bsize <= len)
152 return read(fd, buf, len);
153 if (bsize > 4096)
154 return -1;
155 b = (char*)(((long)(abuf+4096))&~4095UL);
156
157 n = read(fd, b, bsize);
158 if (n <= 0)
159 return n;
160 lseek(fd, len - n, 1);
161 if (n > len)
162 n = len;
163 memcpy(buf, b, n);
164 return n;
165 }
166
167 static int awrite(int fd, void *buf, int len)
168 {
169 /* aligned write.
170 * On devices with a 4K sector size, we need to write
171 * the full sector. We pre-read if the sector is larger
172 * than the write.
173 * The address must be sector-aligned.
174 */
175 int bsize;
176 char *b;
177 int n;
178 if (ioctl(fd, BLKSSZGET, &bsize) != 0 ||
179 bsize <= len)
180 return write(fd, buf, len);
181 if (bsize > 4096)
182 return -1;
183 b = (char*)(((long)(abuf+4096))&~4095UL);
184
185 n = read(fd, b, bsize);
186 if (n <= 0)
187 return n;
188 lseek(fd, -n, 1);
189 memcpy(b, buf, len);
190 n = write(fd, b, bsize);
191 if (n <= 0)
192 return n;
193 lseek(fd, len - n, 1);
194 return len;
195 }
196
197 #ifndef MDASSEMBLE
198 static void examine_super1(struct supertype *st, char *homehost)
199 {
200 struct mdp_superblock_1 *sb = st->sb;
201 time_t atime;
202 unsigned int d;
203 int role;
204 int delta_extra = 0;
205 int i;
206 char *c;
207 int l = homehost ? strlen(homehost) : 0;
208 int layout;
209 unsigned long long sb_offset;
210
211 printf(" Magic : %08x\n", __le32_to_cpu(sb->magic));
212 printf(" Version : 1");
213 sb_offset = __le64_to_cpu(sb->super_offset);
214 if (sb_offset <= 4)
215 printf(".1\n");
216 else if (sb_offset <= 8)
217 printf(".2\n");
218 else
219 printf(".0\n");
220 printf(" Feature Map : 0x%x\n", __le32_to_cpu(sb->feature_map));
221 printf(" Array UUID : ");
222 for (i=0; i<16; i++) {
223 if ((i&3)==0 && i != 0) printf(":");
224 printf("%02x", sb->set_uuid[i]);
225 }
226 printf("\n");
227 printf(" Name : %.32s", sb->set_name);
228 if (l > 0 && l < 32 &&
229 sb->set_name[l] == ':' &&
230 strncmp(sb->set_name, homehost, l) == 0)
231 printf(" (local to host %s)", homehost);
232 printf("\n");
233 atime = __le64_to_cpu(sb->ctime) & 0xFFFFFFFFFFULL;
234 printf(" Creation Time : %.24s\n", ctime(&atime));
235 c=map_num(pers, __le32_to_cpu(sb->level));
236 printf(" Raid Level : %s\n", c?c:"-unknown-");
237 printf(" Raid Devices : %d\n", __le32_to_cpu(sb->raid_disks));
238 printf("\n");
239 printf(" Avail Dev Size : %llu%s\n",
240 (unsigned long long)__le64_to_cpu(sb->data_size),
241 human_size(__le64_to_cpu(sb->data_size)<<9));
242 if (__le32_to_cpu(sb->level) > 0) {
243 int ddsks=0;
244 switch(__le32_to_cpu(sb->level)) {
245 case 1: ddsks=1;break;
246 case 4:
247 case 5: ddsks = __le32_to_cpu(sb->raid_disks)-1; break;
248 case 6: ddsks = __le32_to_cpu(sb->raid_disks)-2; break;
249 case 10:
250 layout = __le32_to_cpu(sb->layout);
251 ddsks = __le32_to_cpu(sb->raid_disks)
252 / (layout&255) / ((layout>>8)&255);
253 }
254 if (ddsks)
255 printf(" Array Size : %llu%s\n",
256 ddsks*(unsigned long long)__le64_to_cpu(sb->size),
257 human_size(ddsks*__le64_to_cpu(sb->size)<<9));
258 if (sb->size != sb->data_size)
259 printf(" Used Dev Size : %llu%s\n",
260 (unsigned long long)__le64_to_cpu(sb->size),
261 human_size(__le64_to_cpu(sb->size)<<9));
262 }
263 if (sb->data_offset)
264 printf(" Data Offset : %llu sectors\n",
265 (unsigned long long)__le64_to_cpu(sb->data_offset));
266 printf(" Super Offset : %llu sectors\n",
267 (unsigned long long)__le64_to_cpu(sb->super_offset));
268 if (__le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET)
269 printf("Recovery Offset : %llu sectors\n", (unsigned long long)__le64_to_cpu(sb->recovery_offset));
270 printf(" State : %s\n", (__le64_to_cpu(sb->resync_offset)+1)? "active":"clean");
271 printf(" Device UUID : ");
272 for (i=0; i<16; i++) {
273 if ((i&3)==0 && i != 0) printf(":");
274 printf("%02x", sb->device_uuid[i]);
275 }
276 printf("\n");
277 printf("\n");
278 if (sb->feature_map & __cpu_to_le32(MD_FEATURE_BITMAP_OFFSET)) {
279 printf("Internal Bitmap : %ld sectors from superblock\n",
280 (long)(int32_t)__le32_to_cpu(sb->bitmap_offset));
281 }
282 if (sb->feature_map & __le32_to_cpu(MD_FEATURE_RESHAPE_ACTIVE)) {
283 printf(" Reshape pos'n : %llu%s\n", (unsigned long long)__le64_to_cpu(sb->reshape_position)/2,
284 human_size(__le64_to_cpu(sb->reshape_position)<<9));
285 if (__le32_to_cpu(sb->delta_disks)) {
286 printf(" Delta Devices : %d", __le32_to_cpu(sb->delta_disks));
287 printf(" (%d->%d)\n",
288 __le32_to_cpu(sb->raid_disks)-__le32_to_cpu(sb->delta_disks),
289 __le32_to_cpu(sb->raid_disks));
290 if ((int)__le32_to_cpu(sb->delta_disks) < 0)
291 delta_extra = -__le32_to_cpu(sb->delta_disks);
292 }
293 if (__le32_to_cpu(sb->new_level) != __le32_to_cpu(sb->level)) {
294 c = map_num(pers, __le32_to_cpu(sb->new_level));
295 printf(" New Level : %s\n", c?c:"-unknown-");
296 }
297 if (__le32_to_cpu(sb->new_layout) != __le32_to_cpu(sb->layout)) {
298 if (__le32_to_cpu(sb->level) == 5) {
299 c = map_num(r5layout, __le32_to_cpu(sb->new_layout));
300 printf(" New Layout : %s\n", c?c:"-unknown-");
301 }
302 if (__le32_to_cpu(sb->level) == 6) {
303 c = map_num(r6layout, __le32_to_cpu(sb->new_layout));
304 printf(" New Layout : %s\n", c?c:"-unknown-");
305 }
306 if (__le32_to_cpu(sb->level) == 10) {
307 printf(" New Layout :");
308 print_r10_layout(__le32_to_cpu(sb->new_layout));
309 printf("\n");
310 }
311 }
312 if (__le32_to_cpu(sb->new_chunk) != __le32_to_cpu(sb->chunksize))
313 printf(" New Chunksize : %dK\n", __le32_to_cpu(sb->new_chunk)/2);
314 printf("\n");
315 }
316 if (sb->devflags) {
317 printf(" Flags :");
318 if (sb->devflags & WriteMostly1)
319 printf(" write-mostly");
320 printf("\n");
321 }
322
323 atime = __le64_to_cpu(sb->utime) & 0xFFFFFFFFFFULL;
324 printf(" Update Time : %.24s\n", ctime(&atime));
325
326 if (calc_sb_1_csum(sb) == sb->sb_csum)
327 printf(" Checksum : %x - correct\n", __le32_to_cpu(sb->sb_csum));
328 else
329 printf(" Checksum : %x - expected %x\n", __le32_to_cpu(sb->sb_csum),
330 __le32_to_cpu(calc_sb_1_csum(sb)));
331 printf(" Events : %llu\n", (unsigned long long)__le64_to_cpu(sb->events));
332 printf("\n");
333 if (__le32_to_cpu(sb->level) == 5) {
334 c = map_num(r5layout, __le32_to_cpu(sb->layout));
335 printf(" Layout : %s\n", c?c:"-unknown-");
336 }
337 if (__le32_to_cpu(sb->level) == 6) {
338 c = map_num(r6layout, __le32_to_cpu(sb->layout));
339 printf(" Layout : %s\n", c?c:"-unknown-");
340 }
341 if (__le32_to_cpu(sb->level) == 10) {
342 int lo = __le32_to_cpu(sb->layout);
343 printf(" Layout :");
344 print_r10_layout(lo);
345 printf("\n");
346 }
347 switch(__le32_to_cpu(sb->level)) {
348 case 0:
349 case 4:
350 case 5:
351 case 6:
352 case 10:
353 printf(" Chunk Size : %dK\n", __le32_to_cpu(sb->chunksize)/2);
354 break;
355 case -1:
356 printf(" Rounding : %dK\n", __le32_to_cpu(sb->chunksize)/2);
357 break;
358 default: break;
359 }
360 printf("\n");
361 #if 0
362 /* This turns out to just be confusing */
363 printf(" Array Slot : %d (", __le32_to_cpu(sb->dev_number));
364 for (i= __le32_to_cpu(sb->max_dev); i> 0 ; i--)
365 if (__le16_to_cpu(sb->dev_roles[i-1]) != 0xffff)
366 break;
367 for (d=0; d < i; d++) {
368 int role = __le16_to_cpu(sb->dev_roles[d]);
369 if (d) printf(", ");
370 if (role == 0xffff) printf("empty");
371 else if(role == 0xfffe) printf("failed");
372 else printf("%d", role);
373 }
374 printf(")\n");
375 #endif
376 printf(" Device Role : ");
377 d = __le32_to_cpu(sb->dev_number);
378 if (d < __le32_to_cpu(sb->max_dev))
379 role = __le16_to_cpu(sb->dev_roles[d]);
380 else
381 role = 0xFFFF;
382 if (role >= 0xFFFE)
383 printf("spare\n");
384 else
385 printf("Active device %d\n", role);
386
387 printf(" Array State : ");
388 for (d=0; d<__le32_to_cpu(sb->raid_disks) + delta_extra; d++) {
389 int cnt = 0;
390 int me = 0;
391 unsigned int i;
392 for (i=0; i< __le32_to_cpu(sb->max_dev); i++) {
393 unsigned int role = __le16_to_cpu(sb->dev_roles[i]);
394 if (role == d) {
395 if (i == __le32_to_cpu(sb->dev_number))
396 me = 1;
397 cnt++;
398 }
399 }
400 if (cnt > 1) printf("?");
401 else if (cnt == 1) printf("A");
402 else printf (".");
403 }
404 #if 0
405 /* This is confusing too */
406 faulty = 0;
407 for (i=0; i< __le32_to_cpu(sb->max_dev); i++) {
408 int role = __le16_to_cpu(sb->dev_roles[i]);
409 if (role == 0xFFFE)
410 faulty++;
411 }
412 if (faulty) printf(" %d failed", faulty);
413 #endif
414 printf(" ('A' == active, '.' == missing)");
415 printf("\n");
416 }
417
418
419 static void brief_examine_super1(struct supertype *st, int verbose)
420 {
421 struct mdp_superblock_1 *sb = st->sb;
422 int i;
423 unsigned long long sb_offset;
424 char *nm;
425 char *c=map_num(pers, __le32_to_cpu(sb->level));
426
427 nm = strchr(sb->set_name, ':');
428 if (nm)
429 nm++;
430 else if (sb->set_name[0])
431 nm = sb->set_name;
432 else
433 nm = NULL;
434
435 printf("ARRAY%s%s", nm ? " /dev/md/":"", nm);
436 if (verbose && c)
437 printf(" level=%s", c);
438 sb_offset = __le64_to_cpu(sb->super_offset);
439 if (sb_offset <= 4)
440 printf(" metadata=1.1 ");
441 else if (sb_offset <= 8)
442 printf(" metadata=1.2 ");
443 else
444 printf(" metadata=1.0 ");
445 if (verbose)
446 printf("num-devices=%d ", __le32_to_cpu(sb->raid_disks));
447 printf("UUID=");
448 for (i=0; i<16; i++) {
449 if ((i&3)==0 && i != 0) printf(":");
450 printf("%02x", sb->set_uuid[i]);
451 }
452 if (sb->set_name[0])
453 printf(" name=%.32s", sb->set_name);
454 printf("\n");
455 }
456
457 static void export_examine_super1(struct supertype *st)
458 {
459 struct mdp_superblock_1 *sb = st->sb;
460 int i;
461 int len = 32;
462
463 printf("MD_LEVEL=%s\n", map_num(pers, __le32_to_cpu(sb->level)));
464 printf("MD_DEVICES=%d\n", __le32_to_cpu(sb->raid_disks));
465 for (i=0; i<32; i++)
466 if (sb->set_name[i] == '\n' ||
467 sb->set_name[i] == '\0') {
468 len = i;
469 break;
470 }
471 if (len)
472 printf("MD_NAME=%.*s\n", len, sb->set_name);
473 printf("MD_UUID=");
474 for (i=0; i<16; i++) {
475 if ((i&3)==0 && i != 0) printf(":");
476 printf("%02x", sb->set_uuid[i]);
477 }
478 printf("\n");
479 printf("MD_UPDATE_TIME=%llu\n",
480 __le64_to_cpu(sb->utime) & 0xFFFFFFFFFFULL);
481 printf("MD_DEV_UUID=");
482 for (i=0; i<16; i++) {
483 if ((i&3)==0 && i != 0) printf(":");
484 printf("%02x", sb->device_uuid[i]);
485 }
486 printf("\n");
487 printf("MD_EVENTS=%llu\n",
488 (unsigned long long)__le64_to_cpu(sb->events));
489 }
490
491 static void detail_super1(struct supertype *st, char *homehost)
492 {
493 struct mdp_superblock_1 *sb = st->sb;
494 int i;
495 int l = homehost ? strlen(homehost) : 0;
496
497 printf(" Name : %.32s", sb->set_name);
498 if (l > 0 && l < 32 &&
499 sb->set_name[l] == ':' &&
500 strncmp(sb->set_name, homehost, l) == 0)
501 printf(" (local to host %s)", homehost);
502 printf("\n UUID : ");
503 for (i=0; i<16; i++) {
504 if ((i&3)==0 && i != 0) printf(":");
505 printf("%02x", sb->set_uuid[i]);
506 }
507 printf("\n Events : %llu\n\n", (unsigned long long)__le64_to_cpu(sb->events));
508 }
509
510 static void brief_detail_super1(struct supertype *st)
511 {
512 struct mdp_superblock_1 *sb = st->sb;
513 int i;
514
515 if (sb->set_name[0])
516 printf(" name=%.32s", sb->set_name);
517 printf(" UUID=");
518 for (i=0; i<16; i++) {
519 if ((i&3)==0 && i != 0) printf(":");
520 printf("%02x", sb->set_uuid[i]);
521 }
522 }
523
524 static void export_detail_super1(struct supertype *st)
525 {
526 struct mdp_superblock_1 *sb = st->sb;
527 int i;
528 int len = 32;
529
530 for (i=0; i<32; i++)
531 if (sb->set_name[i] == '\n' ||
532 sb->set_name[i] == '\0') {
533 len = i;
534 break;
535 }
536 if (len)
537 printf("MD_NAME=%.*s\n", len, sb->set_name);
538 }
539
540 #endif
541
542 static int match_home1(struct supertype *st, char *homehost)
543 {
544 struct mdp_superblock_1 *sb = st->sb;
545 int l = homehost ? strlen(homehost) : 0;
546
547 return (l > 0 && l < 32 &&
548 sb->set_name[l] == ':' &&
549 strncmp(sb->set_name, homehost, l) == 0);
550 }
551
552 static void uuid_from_super1(struct supertype *st, int uuid[4])
553 {
554 struct mdp_superblock_1 *super = st->sb;
555 char *cuuid = (char*)uuid;
556 int i;
557 for (i=0; i<16; i++)
558 cuuid[i] = super->set_uuid[i];
559 }
560
561 static void getinfo_super1(struct supertype *st, struct mdinfo *info)
562 {
563 struct mdp_superblock_1 *sb = st->sb;
564 int working = 0;
565 unsigned int i;
566 int role;
567
568 info->array.major_version = 1;
569 info->array.minor_version = st->minor_version;
570 info->array.patch_version = 0;
571 info->array.raid_disks = __le32_to_cpu(sb->raid_disks);
572 info->array.level = __le32_to_cpu(sb->level);
573 info->array.layout = __le32_to_cpu(sb->layout);
574 info->array.md_minor = -1;
575 info->array.ctime = __le64_to_cpu(sb->ctime);
576 info->array.utime = __le64_to_cpu(sb->utime);
577 info->array.chunk_size = __le32_to_cpu(sb->chunksize)*512;
578 info->array.state =
579 (__le64_to_cpu(sb->resync_offset) >= __le64_to_cpu(sb->size))
580 ? 1 : 0;
581
582 info->data_offset = __le64_to_cpu(sb->data_offset);
583 info->component_size = __le64_to_cpu(sb->size);
584
585 info->disk.major = 0;
586 info->disk.minor = 0;
587 info->disk.number = __le32_to_cpu(sb->dev_number);
588 if (__le32_to_cpu(sb->dev_number) >= __le32_to_cpu(sb->max_dev) ||
589 __le32_to_cpu(sb->max_dev) > 512)
590 role = 0xfffe;
591 else
592 role = __le16_to_cpu(sb->dev_roles[__le32_to_cpu(sb->dev_number)]);
593
594 info->disk.raid_disk = -1;
595 switch(role) {
596 case 0xFFFF:
597 info->disk.state = 0; /* spare: not active, not sync, not faulty */
598 break;
599 case 0xFFFE:
600 info->disk.state = 1; /* faulty */
601 break;
602 default:
603 info->disk.state = 6; /* active and in sync */
604 info->disk.raid_disk = role;
605 }
606 info->events = __le64_to_cpu(sb->events);
607 sprintf(info->text_version, "1.%d", st->minor_version);
608 info->safe_mode_delay = 200;
609
610 memcpy(info->uuid, sb->set_uuid, 16);
611
612 strncpy(info->name, sb->set_name, 32);
613 info->name[32] = 0;
614
615 if (sb->feature_map & __le32_to_cpu(MD_FEATURE_RECOVERY_OFFSET))
616 info->recovery_start = __le32_to_cpu(sb->recovery_offset);
617 else
618 info->recovery_start = MaxSector;
619
620 if (sb->feature_map & __le32_to_cpu(MD_FEATURE_RESHAPE_ACTIVE)) {
621 info->reshape_active = 1;
622 info->reshape_progress = __le64_to_cpu(sb->reshape_position);
623 info->new_level = __le32_to_cpu(sb->new_level);
624 info->delta_disks = __le32_to_cpu(sb->delta_disks);
625 info->new_layout = __le32_to_cpu(sb->new_layout);
626 info->new_chunk = __le32_to_cpu(sb->new_chunk)<<9;
627 if (info->delta_disks < 0)
628 info->array.raid_disks -= info->delta_disks;
629 } else
630 info->reshape_active = 0;
631
632 for (i = 0; i < __le32_to_cpu(sb->max_dev); i++) {
633 role = __le16_to_cpu(sb->dev_roles[i]);
634 if (/*role == 0xFFFF || */role < info->array.raid_disks)
635 working++;
636 }
637
638 info->array.working_disks = working;
639 }
640
641 static int update_super1(struct supertype *st, struct mdinfo *info,
642 char *update,
643 char *devname, int verbose,
644 int uuid_set, char *homehost)
645 {
646 /* NOTE: for 'assemble' and 'force' we need to return non-zero
647 * if any change was made. For others, the return value is
648 * ignored.
649 */
650 int rv = 0;
651 struct mdp_superblock_1 *sb = st->sb;
652
653 if (strcmp(update, "force-one")==0) {
654 /* Not enough devices for a working array,
655 * so bring this one up-to-date
656 */
657 if (sb->events != __cpu_to_le64(info->events))
658 rv = 1;
659 sb->events = __cpu_to_le64(info->events);
660 }
661 if (strcmp(update, "force-array")==0) {
662 /* Degraded array and 'force' requests to
663 * maybe need to mark it 'clean'.
664 */
665 switch(__le32_to_cpu(sb->level)) {
666 case 5: case 4: case 6:
667 /* need to force clean */
668 if (sb->resync_offset != MaxSector)
669 rv = 1;
670 sb->resync_offset = MaxSector;
671 }
672 }
673 if (strcmp(update, "assemble")==0) {
674 int d = info->disk.number;
675 int want;
676 if (info->disk.state == 6)
677 want = info->disk.raid_disk;
678 else
679 want = 0xFFFF;
680 if (sb->dev_roles[d] != __cpu_to_le16(want)) {
681 sb->dev_roles[d] = __cpu_to_le16(want);
682 rv = 1;
683 }
684 if (info->reshape_active &&
685 sb->feature_map & __le32_to_cpu(MD_FEATURE_RESHAPE_ACTIVE) &&
686 info->delta_disks >= 0 &&
687 info->reshape_progress < __le64_to_cpu(sb->reshape_position)) {
688 sb->reshape_position = __cpu_to_le64(info->reshape_progress);
689 rv = 1;
690 }
691 if (info->reshape_active &&
692 sb->feature_map & __le32_to_cpu(MD_FEATURE_RESHAPE_ACTIVE) &&
693 info->delta_disks < 0 &&
694 info->reshape_progress > __le64_to_cpu(sb->reshape_position)) {
695 sb->reshape_position = __cpu_to_le64(info->reshape_progress);
696 rv = 1;
697 }
698 }
699 if (strcmp(update, "linear-grow-new") == 0) {
700 unsigned int i;
701 int rfd, fd;
702 unsigned int max = __le32_to_cpu(sb->max_dev);
703
704 for (i=0 ; i < max ; i++)
705 if (__le16_to_cpu(sb->dev_roles[i]) >= 0xfffe)
706 break;
707 sb->dev_number = __cpu_to_le32(i);
708 info->disk.number = i;
709 if (max >= __le32_to_cpu(sb->max_dev))
710 sb->max_dev = __cpu_to_le32(max+1);
711
712 if ((rfd = open("/dev/urandom", O_RDONLY)) < 0 ||
713 read(rfd, sb->device_uuid, 16) != 16) {
714 __u32 r[4] = {random(), random(), random(), random()};
715 memcpy(sb->device_uuid, r, 16);
716 }
717 if (rfd >= 0)
718 close(rfd);
719
720 sb->dev_roles[i] =
721 __cpu_to_le16(info->disk.raid_disk);
722
723 fd = open(devname, O_RDONLY);
724 if (fd >= 0) {
725 unsigned long long ds;
726 get_dev_size(fd, devname, &ds);
727 close(fd);
728 ds >>= 9;
729 if (__le64_to_cpu(sb->super_offset) <
730 __le64_to_cpu(sb->data_offset)) {
731 sb->data_size = __cpu_to_le64(
732 ds - __le64_to_cpu(sb->data_offset));
733 } else {
734 ds -= 8*2;
735 ds &= ~(unsigned long long)(4*2-1);
736 sb->super_offset = __cpu_to_le64(ds);
737 sb->data_size = __cpu_to_le64(
738 ds - __le64_to_cpu(sb->data_offset));
739 }
740 }
741 }
742 if (strcmp(update, "linear-grow-update") == 0) {
743 sb->raid_disks = __cpu_to_le32(info->array.raid_disks);
744 sb->dev_roles[info->disk.number] =
745 __cpu_to_le16(info->disk.raid_disk);
746 }
747 if (strcmp(update, "resync") == 0) {
748 /* make sure resync happens */
749 sb->resync_offset = 0ULL;
750 }
751 if (strcmp(update, "uuid") == 0) {
752 copy_uuid(sb->set_uuid, info->uuid, super1.swapuuid);
753
754 if (__le32_to_cpu(sb->feature_map)&MD_FEATURE_BITMAP_OFFSET) {
755 struct bitmap_super_s *bm;
756 bm = (struct bitmap_super_s*)(st->sb+1024);
757 memcpy(bm->uuid, sb->set_uuid, 16);
758 }
759 } else if (strcmp(update, "no-bitmap") == 0) {
760 sb->feature_map &= ~__cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
761 }
762 if (strcmp(update, "homehost") == 0 &&
763 homehost) {
764 char *c;
765 update = "name";
766 c = strchr(sb->set_name, ':');
767 if (c)
768 strncpy(info->name, c+1, 31 - (c-sb->set_name));
769 else
770 strncpy(info->name, sb->set_name, 32);
771 info->name[32] = 0;
772 }
773 if (strcmp(update, "name") == 0) {
774 if (info->name[0] == 0)
775 sprintf(info->name, "%d", info->array.md_minor);
776 memset(sb->set_name, 0, sizeof(sb->set_name));
777 if (homehost &&
778 strchr(info->name, ':') == NULL &&
779 strlen(homehost)+1+strlen(info->name) < 32) {
780 strcpy(sb->set_name, homehost);
781 strcat(sb->set_name, ":");
782 strcat(sb->set_name, info->name);
783 } else
784 strcpy(sb->set_name, info->name);
785 }
786 if (strcmp(update, "devicesize") == 0 &&
787 __le64_to_cpu(sb->super_offset) <
788 __le64_to_cpu(sb->data_offset)) {
789 /* set data_size to device size less data_offset */
790 struct misc_dev_info *misc = (struct misc_dev_info*)
791 (st->sb + 1024 + 512);
792 printf("Size was %llu\n", (unsigned long long)
793 __le64_to_cpu(sb->data_size));
794 sb->data_size = __cpu_to_le64(
795 misc->device_size - __le64_to_cpu(sb->data_offset));
796 printf("Size is %llu\n", (unsigned long long)
797 __le64_to_cpu(sb->data_size));
798 }
799 if (strcmp(update, "_reshape_progress")==0)
800 sb->reshape_position = __cpu_to_le64(info->reshape_progress);
801
802 sb->sb_csum = calc_sb_1_csum(sb);
803 return rv;
804 }
805
806 static int init_super1(struct supertype *st, mdu_array_info_t *info,
807 unsigned long long size, char *name, char *homehost, int *uuid)
808 {
809 struct mdp_superblock_1 *sb;
810 int spares;
811 int rfd;
812 char defname[10];
813
814 if (posix_memalign((void**)&sb, 512, (1024 + 512 +
815 sizeof(struct misc_dev_info))) != 0) {
816 fprintf(stderr, Name
817 ": %s could not allocate superblock\n", __func__);
818 return 0;
819 }
820 memset(sb, 0, 1024);
821
822 st->sb = sb;
823 if (info == NULL) {
824 /* zeroing superblock */
825 return 0;
826 }
827
828 spares = info->working_disks - info->active_disks;
829 if (info->raid_disks + spares > 384) {
830 fprintf(stderr, Name ": too many devices requested: %d+%d > %d\n",
831 info->raid_disks , spares, 384);
832 return 0;
833 }
834
835 sb->magic = __cpu_to_le32(MD_SB_MAGIC);
836 sb->major_version = __cpu_to_le32(1);
837 sb->feature_map = 0;
838 sb->pad0 = 0;
839
840 if (uuid)
841 copy_uuid(sb->set_uuid, uuid, super1.swapuuid);
842 else {
843 if ((rfd = open("/dev/urandom", O_RDONLY)) < 0 ||
844 read(rfd, sb->set_uuid, 16) != 16) {
845 __u32 r[4] = {random(), random(), random(), random()};
846 memcpy(sb->set_uuid, r, 16);
847 }
848 if (rfd >= 0) close(rfd);
849 }
850
851 if (name == NULL || *name == 0) {
852 sprintf(defname, "%d", info->md_minor);
853 name = defname;
854 }
855 memset(sb->set_name, 0, 32);
856 if (homehost &&
857 strchr(name, ':')== NULL &&
858 strlen(homehost)+1+strlen(name) < 32) {
859 strcpy(sb->set_name, homehost);
860 strcat(sb->set_name, ":");
861 strcat(sb->set_name, name);
862 } else
863 strcpy(sb->set_name, name);
864
865 sb->ctime = __cpu_to_le64((unsigned long long)time(0));
866 sb->level = __cpu_to_le32(info->level);
867 sb->layout = __cpu_to_le32(info->layout);
868 sb->size = __cpu_to_le64(size*2ULL);
869 sb->chunksize = __cpu_to_le32(info->chunk_size>>9);
870 sb->raid_disks = __cpu_to_le32(info->raid_disks);
871
872 sb->data_offset = __cpu_to_le64(0);
873 sb->data_size = __cpu_to_le64(0);
874 sb->super_offset = __cpu_to_le64(0);
875 sb->recovery_offset = __cpu_to_le64(0);
876
877 sb->utime = sb->ctime;
878 sb->events = __cpu_to_le64(1);
879 if (info->state & (1<<MD_SB_CLEAN))
880 sb->resync_offset = MaxSector;
881 else
882 sb->resync_offset = 0;
883 sb->max_dev = __cpu_to_le32((1024- sizeof(struct mdp_superblock_1))/
884 sizeof(sb->dev_roles[0]));
885 memset(sb->pad3, 0, sizeof(sb->pad3));
886
887 memset(sb->dev_roles, 0xff, 1024 - sizeof(struct mdp_superblock_1));
888
889 return 1;
890 }
891
892 struct devinfo {
893 int fd;
894 char *devname;
895 mdu_disk_info_t disk;
896 struct devinfo *next;
897 };
898 #ifndef MDASSEMBLE
899 /* Add a device to the superblock being created */
900 static int add_to_super1(struct supertype *st, mdu_disk_info_t *dk,
901 int fd, char *devname)
902 {
903 struct mdp_superblock_1 *sb = st->sb;
904 __u16 *rp = sb->dev_roles + dk->number;
905 struct devinfo *di, **dip;
906
907 if ((dk->state & 6) == 6) /* active, sync */
908 *rp = __cpu_to_le16(dk->raid_disk);
909 else if ((dk->state & ~2) == 0) /* active or idle -> spare */
910 *rp = 0xffff;
911 else
912 *rp = 0xfffe;
913
914 if (dk->number >= (int)__le32_to_cpu(sb->max_dev) &&
915 __le32_to_cpu(sb->max_dev) < 384)
916 sb->max_dev = __cpu_to_le32(dk->number+1);
917
918 sb->dev_number = __cpu_to_le32(dk->number);
919 sb->sb_csum = calc_sb_1_csum(sb);
920
921 dip = (struct devinfo **)&st->info;
922 while (*dip)
923 dip = &(*dip)->next;
924 di = malloc(sizeof(struct devinfo));
925 di->fd = fd;
926 di->devname = devname;
927 di->disk = *dk;
928 di->next = NULL;
929 *dip = di;
930
931 return 0;
932 }
933 #endif
934
935 static void locate_bitmap1(struct supertype *st, int fd);
936
937 static int store_super1(struct supertype *st, int fd)
938 {
939 struct mdp_superblock_1 *sb = st->sb;
940 unsigned long long sb_offset;
941 int sbsize;
942 unsigned long long dsize;
943
944 if (!get_dev_size(fd, NULL, &dsize))
945 return 1;
946
947 dsize >>= 9;
948
949 if (dsize < 24)
950 return 2;
951
952 /*
953 * Calculate the position of the superblock.
954 * It is always aligned to a 4K boundary and
955 * depending on minor_version, it can be:
956 * 0: At least 8K, but less than 12K, from end of device
957 * 1: At start of device
958 * 2: 4K from start of device.
959 */
960 switch(st->minor_version) {
961 case 0:
962 sb_offset = dsize;
963 sb_offset -= 8*2;
964 sb_offset &= ~(4*2-1);
965 break;
966 case 1:
967 sb_offset = 0;
968 break;
969 case 2:
970 sb_offset = 4*2;
971 break;
972 default:
973 return -EINVAL;
974 }
975
976
977
978 if (sb_offset != __le64_to_cpu(sb->super_offset) &&
979 0 != __le64_to_cpu(sb->super_offset)
980 ) {
981 fprintf(stderr, Name ": internal error - sb_offset is wrong\n");
982 abort();
983 }
984
985 if (lseek64(fd, sb_offset << 9, 0)< 0LL)
986 return 3;
987
988 sbsize = sizeof(*sb) + 2 * __le32_to_cpu(sb->max_dev);
989 sbsize = (sbsize+511)&(~511UL);
990
991 if (awrite(fd, sb, sbsize) != sbsize)
992 return 4;
993
994 if (sb->feature_map & __cpu_to_le32(MD_FEATURE_BITMAP_OFFSET)) {
995 struct bitmap_super_s *bm = (struct bitmap_super_s*)
996 (((char*)sb)+1024);
997 if (__le32_to_cpu(bm->magic) == BITMAP_MAGIC) {
998 locate_bitmap1(st, fd);
999 if (awrite(fd, bm, sizeof(*bm)) !=
1000 sizeof(*bm))
1001 return 5;
1002 }
1003 }
1004 fsync(fd);
1005 return 0;
1006 }
1007
1008 static int load_super1(struct supertype *st, int fd, char *devname);
1009
1010 static unsigned long choose_bm_space(unsigned long devsize)
1011 {
1012 /* if the device is bigger than 8Gig, save 64k for bitmap usage,
1013 * if bigger than 200Gig, save 128k
1014 * NOTE: result must be multiple of 4K else bad things happen
1015 * on 4K-sector devices.
1016 */
1017 if (devsize < 64*2) return 0;
1018 if (devsize - 64*2 >= 200*1024*1024*2)
1019 return 128*2;
1020 if (devsize - 4*2 > 8*1024*1024*2)
1021 return 64*2;
1022 return 4*2;
1023 }
1024
1025 #ifndef MDASSEMBLE
1026 static int write_init_super1(struct supertype *st)
1027 {
1028 struct mdp_superblock_1 *sb = st->sb;
1029 struct supertype refst;
1030 int rfd;
1031 int rv = 0;
1032 unsigned long long bm_space;
1033 unsigned long long reserved;
1034 struct devinfo *di;
1035 unsigned long long dsize, array_size;
1036 unsigned long long sb_offset;
1037
1038 for (di = st->info; di && ! rv ; di = di->next) {
1039 if (di->disk.state == 1)
1040 continue;
1041 if (di->fd < 0)
1042 continue;
1043
1044 while (Kill(di->devname, NULL, 0, 1, 1) == 0)
1045 ;
1046
1047 sb->dev_number = __cpu_to_le32(di->disk.number);
1048 if (di->disk.state & (1<<MD_DISK_WRITEMOSTLY))
1049 sb->devflags |= __cpu_to_le32(WriteMostly1);
1050
1051 if ((rfd = open("/dev/urandom", O_RDONLY)) < 0 ||
1052 read(rfd, sb->device_uuid, 16) != 16) {
1053 __u32 r[4] = {random(), random(), random(), random()};
1054 memcpy(sb->device_uuid, r, 16);
1055 }
1056 if (rfd >= 0)
1057 close(rfd);
1058
1059 sb->events = 0;
1060
1061 refst =*st;
1062 refst.sb = NULL;
1063 if (load_super1(&refst, di->fd, NULL)==0) {
1064 struct mdp_superblock_1 *refsb = refst.sb;
1065
1066 memcpy(sb->device_uuid, refsb->device_uuid, 16);
1067 if (memcmp(sb->set_uuid, refsb->set_uuid, 16)==0) {
1068 /* same array, so preserve events and
1069 * dev_number */
1070 sb->events = refsb->events;
1071 /* bugs in 2.6.17 and earlier mean the
1072 * dev_number chosen in Manage must be preserved
1073 */
1074 if (get_linux_version() >= 2006018)
1075 sb->dev_number = refsb->dev_number;
1076 }
1077 free(refsb);
1078 }
1079
1080 if (!get_dev_size(di->fd, NULL, &dsize))
1081 return 1;
1082 dsize >>= 9;
1083
1084 if (dsize < 24) {
1085 close(di->fd);
1086 return 2;
1087 }
1088
1089
1090 /*
1091 * Calculate the position of the superblock.
1092 * It is always aligned to a 4K boundary and
1093 * depending on minor_version, it can be:
1094 * 0: At least 8K, but less than 12K, from end of device
1095 * 1: At start of device
1096 * 2: 4K from start of device.
1097 * Depending on the array size, we might leave extra space
1098 * for a bitmap.
1099 */
1100 array_size = __le64_to_cpu(sb->size);
1101 /* work out how much space we left for a bitmap */
1102 bm_space = choose_bm_space(array_size);
1103
1104 switch(st->minor_version) {
1105 case 0:
1106 sb_offset = dsize;
1107 sb_offset -= 8*2;
1108 sb_offset &= ~(4*2-1);
1109 sb->super_offset = __cpu_to_le64(sb_offset);
1110 sb->data_offset = __cpu_to_le64(0);
1111 if (sb_offset < array_size + bm_space)
1112 bm_space = sb_offset - array_size;
1113 sb->data_size = __cpu_to_le64(sb_offset - bm_space);
1114 break;
1115 case 1:
1116 sb->super_offset = __cpu_to_le64(0);
1117 reserved = bm_space + 4*2;
1118 /* Try for multiple of 1Meg so it is nicely aligned */
1119 #define ONE_MEG (2*1024)
1120 reserved = ((reserved + ONE_MEG-1)/ONE_MEG) * ONE_MEG;
1121 if (reserved + __le64_to_cpu(sb->size) > dsize)
1122 reserved = dsize - __le64_to_cpu(sb->size);
1123 /* force 4K alignment */
1124 reserved &= ~7ULL;
1125
1126 sb->data_offset = __cpu_to_le64(reserved);
1127 sb->data_size = __cpu_to_le64(dsize - reserved);
1128 break;
1129 case 2:
1130 sb_offset = 4*2;
1131 sb->super_offset = __cpu_to_le64(4*2);
1132 if (4*2 + 4*2 + bm_space + __le64_to_cpu(sb->size)
1133 > dsize)
1134 bm_space = dsize - __le64_to_cpu(sb->size)
1135 - 4*2 - 4*2;
1136
1137 reserved = bm_space + 4*2 + 4*2;
1138 /* Try for multiple of 1Meg so it is nicely aligned */
1139 #define ONE_MEG (2*1024)
1140 reserved = ((reserved + ONE_MEG-1)/ONE_MEG) * ONE_MEG;
1141 if (reserved + __le64_to_cpu(sb->size) > dsize)
1142 reserved = dsize - __le64_to_cpu(sb->size);
1143 /* force 4K alignment */
1144 reserved &= ~7ULL;
1145
1146 sb->data_offset = __cpu_to_le64(reserved);
1147 sb->data_size = __cpu_to_le64(dsize - reserved);
1148 break;
1149 default:
1150 return -EINVAL;
1151 }
1152
1153
1154 sb->sb_csum = calc_sb_1_csum(sb);
1155 rv = store_super1(st, di->fd);
1156 if (rv)
1157 fprintf(stderr,
1158 Name ": failed to write superblock to %s\n",
1159 di->devname);
1160
1161 if (rv == 0 && (__le32_to_cpu(sb->feature_map) & 1))
1162 rv = st->ss->write_bitmap(st, di->fd);
1163 close(di->fd);
1164 di->fd = -1;
1165 }
1166 return rv;
1167 }
1168 #endif
1169
1170 static int compare_super1(struct supertype *st, struct supertype *tst)
1171 {
1172 /*
1173 * return:
1174 * 0 same, or first was empty, and second was copied
1175 * 1 second had wrong number
1176 * 2 wrong uuid
1177 * 3 wrong other info
1178 */
1179 struct mdp_superblock_1 *first = st->sb;
1180 struct mdp_superblock_1 *second = tst->sb;
1181
1182 if (second->magic != __cpu_to_le32(MD_SB_MAGIC))
1183 return 1;
1184 if (second->major_version != __cpu_to_le32(1))
1185 return 1;
1186
1187 if (!first) {
1188 if (posix_memalign((void**)&first, 512,
1189 1024 + 512 +
1190 sizeof(struct misc_dev_info)) != 0) {
1191 fprintf(stderr, Name
1192 ": %s could not allocate superblock\n", __func__);
1193 return 1;
1194 }
1195 memcpy(first, second, 1024 + 512 +
1196 sizeof(struct misc_dev_info));
1197 st->sb = first;
1198 return 0;
1199 }
1200 if (memcmp(first->set_uuid, second->set_uuid, 16)!= 0)
1201 return 2;
1202
1203 if (first->ctime != second->ctime ||
1204 first->level != second->level ||
1205 first->layout != second->layout ||
1206 first->size != second->size ||
1207 first->chunksize != second->chunksize ||
1208 first->raid_disks != second->raid_disks)
1209 return 3;
1210 return 0;
1211 }
1212
1213 static void free_super1(struct supertype *st);
1214
1215 static int load_super1(struct supertype *st, int fd, char *devname)
1216 {
1217 unsigned long long dsize;
1218 unsigned long long sb_offset;
1219 struct mdp_superblock_1 *super;
1220 int uuid[4];
1221 struct bitmap_super_s *bsb;
1222 struct misc_dev_info *misc;
1223
1224 free_super1(st);
1225
1226 if (st->subarray[0])
1227 return 1;
1228
1229 if (st->ss == NULL || st->minor_version == -1) {
1230 int bestvers = -1;
1231 struct supertype tst;
1232 __u64 bestctime = 0;
1233 /* guess... choose latest ctime */
1234 memset(&tst, 0, sizeof(tst));
1235 tst.ss = &super1;
1236 for (tst.minor_version = 0; tst.minor_version <= 2 ; tst.minor_version++) {
1237 switch(load_super1(&tst, fd, devname)) {
1238 case 0: super = tst.sb;
1239 if (bestvers == -1 ||
1240 bestctime < __le64_to_cpu(super->ctime)) {
1241 bestvers = tst.minor_version;
1242 bestctime = __le64_to_cpu(super->ctime);
1243 }
1244 free(super);
1245 tst.sb = NULL;
1246 break;
1247 case 1: return 1; /*bad device */
1248 case 2: break; /* bad, try next */
1249 }
1250 }
1251 if (bestvers != -1) {
1252 int rv;
1253 tst.minor_version = bestvers;
1254 tst.ss = &super1;
1255 tst.max_devs = 384;
1256 rv = load_super1(&tst, fd, devname);
1257 if (rv == 0)
1258 *st = tst;
1259 return rv;
1260 }
1261 return 2;
1262 }
1263 if (!get_dev_size(fd, devname, &dsize))
1264 return 1;
1265 dsize >>= 9;
1266
1267 if (dsize < 24) {
1268 if (devname)
1269 fprintf(stderr, Name ": %s is too small for md: size is %llu sectors.\n",
1270 devname, dsize);
1271 return 1;
1272 }
1273
1274 /*
1275 * Calculate the position of the superblock.
1276 * It is always aligned to a 4K boundary and
1277 * depending on minor_version, it can be:
1278 * 0: At least 8K, but less than 12K, from end of device
1279 * 1: At start of device
1280 * 2: 4K from start of device.
1281 */
1282 switch(st->minor_version) {
1283 case 0:
1284 sb_offset = dsize;
1285 sb_offset -= 8*2;
1286 sb_offset &= ~(4*2-1);
1287 break;
1288 case 1:
1289 sb_offset = 0;
1290 break;
1291 case 2:
1292 sb_offset = 4*2;
1293 break;
1294 default:
1295 return -EINVAL;
1296 }
1297
1298 ioctl(fd, BLKFLSBUF, 0); /* make sure we read current data */
1299
1300
1301 if (lseek64(fd, sb_offset << 9, 0)< 0LL) {
1302 if (devname)
1303 fprintf(stderr, Name ": Cannot seek to superblock on %s: %s\n",
1304 devname, strerror(errno));
1305 return 1;
1306 }
1307
1308 if (posix_memalign((void**)&super, 512,
1309 1024 + 512 +
1310 sizeof(struct misc_dev_info)) != 0) {
1311 fprintf(stderr, Name ": %s could not allocate superblock\n",
1312 __func__);
1313 return 1;
1314 }
1315
1316 if (aread(fd, super, 1024) != 1024) {
1317 if (devname)
1318 fprintf(stderr, Name ": Cannot read superblock on %s\n",
1319 devname);
1320 free(super);
1321 return 1;
1322 }
1323
1324 if (__le32_to_cpu(super->magic) != MD_SB_MAGIC) {
1325 if (devname)
1326 fprintf(stderr, Name ": No super block found on %s (Expected magic %08x, got %08x)\n",
1327 devname, MD_SB_MAGIC, __le32_to_cpu(super->magic));
1328 free(super);
1329 return 2;
1330 }
1331
1332 if (__le32_to_cpu(super->major_version) != 1) {
1333 if (devname)
1334 fprintf(stderr, Name ": Cannot interpret superblock on %s - version is %d\n",
1335 devname, __le32_to_cpu(super->major_version));
1336 free(super);
1337 return 2;
1338 }
1339 if (__le64_to_cpu(super->super_offset) != sb_offset) {
1340 if (devname)
1341 fprintf(stderr, Name ": No superblock found on %s (super_offset is wrong)\n",
1342 devname);
1343 free(super);
1344 return 2;
1345 }
1346 st->sb = super;
1347
1348 bsb = (struct bitmap_super_s *)(((char*)super)+1024);
1349
1350 misc = (struct misc_dev_info*) (((char*)super)+1024+512);
1351 misc->device_size = dsize;
1352
1353 /* Now check on the bitmap superblock */
1354 if ((__le32_to_cpu(super->feature_map)&MD_FEATURE_BITMAP_OFFSET) == 0)
1355 return 0;
1356 /* Read the bitmap superblock and make sure it looks
1357 * valid. If it doesn't clear the bit. An --assemble --force
1358 * should get that written out.
1359 */
1360 locate_bitmap1(st, fd);
1361 if (aread(fd, ((char*)super)+1024, 512)
1362 != 512)
1363 goto no_bitmap;
1364
1365 uuid_from_super1(st, uuid);
1366 if (__le32_to_cpu(bsb->magic) != BITMAP_MAGIC ||
1367 memcmp(bsb->uuid, uuid, 16) != 0)
1368 goto no_bitmap;
1369 return 0;
1370
1371 no_bitmap:
1372 super->feature_map = __cpu_to_le32(__le32_to_cpu(super->feature_map) & ~1);
1373 return 0;
1374 }
1375
1376
1377 static struct supertype *match_metadata_desc1(char *arg)
1378 {
1379 struct supertype *st = malloc(sizeof(*st));
1380 if (!st) return st;
1381
1382 memset(st, 0, sizeof(*st));
1383 st->ss = &super1;
1384 st->max_devs = 384;
1385 st->sb = NULL;
1386 /* leading zeros can be safely ignored. --detail generates them. */
1387 while (*arg == '0')
1388 arg++;
1389 if (strcmp(arg, "1.0") == 0 ||
1390 strcmp(arg, "1.00") == 0) {
1391 st->minor_version = 0;
1392 return st;
1393 }
1394 if (strcmp(arg, "1.1") == 0 ||
1395 strcmp(arg, "1.01") == 0
1396 ) {
1397 st->minor_version = 1;
1398 return st;
1399 }
1400 if (strcmp(arg, "1.2") == 0 ||
1401 #ifndef DEFAULT_OLD_METADATA /* ifdef in super0.c */
1402 strcmp(arg, "default") == 0 ||
1403 #endif /* DEFAULT_OLD_METADATA */
1404 strcmp(arg, "1.02") == 0) {
1405 st->minor_version = 2;
1406 return st;
1407 }
1408 if (strcmp(arg, "1") == 0 ||
1409 strcmp(arg, "default") == 0) {
1410 st->minor_version = -1;
1411 return st;
1412 }
1413
1414 free(st);
1415 return NULL;
1416 }
1417
1418 /* find available size on device with this devsize, using
1419 * superblock type st, and reserving 'reserve' sectors for
1420 * a possible bitmap
1421 */
1422 static __u64 avail_size1(struct supertype *st, __u64 devsize)
1423 {
1424 struct mdp_superblock_1 *super = st->sb;
1425 if (devsize < 24)
1426 return 0;
1427
1428 if (super == NULL)
1429 /* creating: allow suitable space for bitmap */
1430 devsize -= choose_bm_space(devsize);
1431 #ifndef MDASSEMBLE
1432 else if (__le32_to_cpu(super->feature_map)&MD_FEATURE_BITMAP_OFFSET) {
1433 /* hot-add. allow for actual size of bitmap */
1434 struct bitmap_super_s *bsb;
1435 bsb = (struct bitmap_super_s *)(((char*)super)+1024);
1436 devsize -= bitmap_sectors(bsb);
1437 }
1438 #endif
1439
1440 if (st->minor_version < 0)
1441 /* not specified, so time to set default */
1442 st->minor_version = 2;
1443 if (super == NULL && st->minor_version > 0) {
1444 /* haven't committed to a size yet, so allow some
1445 * slack for alignment of data_offset.
1446 * We haven't access to device details so allow
1447 * 1 Meg if bigger than 1Gig
1448 */
1449 if (devsize > 1024*1024*2)
1450 devsize -= 1024*2;
1451 }
1452 switch(st->minor_version) {
1453 case 0:
1454 /* at end */
1455 return ((devsize - 8*2 ) & ~(4*2-1));
1456 case 1:
1457 /* at start, 4K for superblock and possible bitmap */
1458 return devsize - 4*2;
1459 case 2:
1460 /* 4k from start, 4K for superblock and possible bitmap */
1461 return devsize - (4+4)*2;
1462 }
1463 return 0;
1464 }
1465
1466 static int
1467 add_internal_bitmap1(struct supertype *st,
1468 int *chunkp, int delay, int write_behind,
1469 unsigned long long size,
1470 int may_change, int major)
1471 {
1472 /*
1473 * If not may_change, then this is a 'Grow', and the bitmap
1474 * must fit after the superblock.
1475 * If may_change, then this is create, and we can put the bitmap
1476 * before the superblock if we like, or may move the start.
1477 * If !may_change, the bitmap MUST live at offset of 1K, until
1478 * we get a sysfs interface.
1479 *
1480 * size is in sectors, chunk is in bytes !!!
1481 */
1482
1483 unsigned long long bits;
1484 unsigned long long max_bits;
1485 unsigned long long min_chunk;
1486 long offset;
1487 unsigned long long chunk = *chunkp;
1488 int room = 0;
1489 struct mdp_superblock_1 *sb = st->sb;
1490 bitmap_super_t *bms = (bitmap_super_t*)(((char*)sb) + 1024);
1491
1492 switch(st->minor_version) {
1493 case 0:
1494 /* either 3K after the superblock (when hot-add),
1495 * or some amount of space before.
1496 */
1497 if (may_change) {
1498 /* We are creating array, so we *know* how much room has
1499 * been left.
1500 */
1501 offset = 0;
1502 room = choose_bm_space(__le64_to_cpu(sb->size));
1503 } else {
1504 room = __le64_to_cpu(sb->super_offset)
1505 - __le64_to_cpu(sb->data_offset)
1506 - __le64_to_cpu(sb->data_size);
1507 /* remove '1 ||' when we can set offset via sysfs */
1508 if (1 || (room < 3*2 &&
1509 __le32_to_cpu(sb->max_dev) <= 384)) {
1510 room = 3*2;
1511 offset = 1*2;
1512 } else {
1513 offset = 0; /* means movable offset */
1514 }
1515 }
1516 break;
1517 case 1:
1518 case 2: /* between superblock and data */
1519 if (may_change) {
1520 offset = 4*2;
1521 room = choose_bm_space(__le64_to_cpu(sb->size));
1522 } else {
1523 room = __le64_to_cpu(sb->data_offset)
1524 - __le64_to_cpu(sb->super_offset);
1525 if (1 || __le32_to_cpu(sb->max_dev) <= 384) {
1526 room -= 2;
1527 offset = 2;
1528 } else {
1529 room -= 4*2;
1530 offset = 4*2;
1531 }
1532 }
1533 break;
1534 default:
1535 return 0;
1536 }
1537
1538 if (chunk == UnSet && room > 128*2)
1539 /* Limit to 128K of bitmap when chunk size not requested */
1540 room = 128*2;
1541
1542 max_bits = (room * 512 - sizeof(bitmap_super_t)) * 8;
1543
1544 min_chunk = 4096; /* sub-page chunks don't work yet.. */
1545 bits = (size*512)/min_chunk +1;
1546 while (bits > max_bits) {
1547 min_chunk *= 2;
1548 bits = (bits+1)/2;
1549 }
1550 if (chunk == UnSet) {
1551 /* For practical purpose, 64Meg is a good
1552 * default chunk size for internal bitmaps.
1553 */
1554 chunk = min_chunk;
1555 if (chunk < 64*1024*1024)
1556 chunk = 64*1024*1024;
1557 } else if (chunk < min_chunk)
1558 return 0; /* chunk size too small */
1559 if (chunk == 0) /* rounding problem */
1560 return 0;
1561
1562 if (offset == 0) {
1563 /* start bitmap on a 4K boundary with enough space for
1564 * the bitmap
1565 */
1566 bits = (size*512) / chunk + 1;
1567 room = ((bits+7)/8 + sizeof(bitmap_super_t) +4095)/4096;
1568 room *= 8; /* convert 4K blocks to sectors */
1569 offset = -room;
1570 }
1571
1572 sb->bitmap_offset = __cpu_to_le32(offset);
1573
1574 sb->feature_map = __cpu_to_le32(__le32_to_cpu(sb->feature_map) | 1);
1575 memset(bms, 0, sizeof(*bms));
1576 bms->magic = __cpu_to_le32(BITMAP_MAGIC);
1577 bms->version = __cpu_to_le32(major);
1578 uuid_from_super1(st, (int*)bms->uuid);
1579 bms->chunksize = __cpu_to_le32(chunk);
1580 bms->daemon_sleep = __cpu_to_le32(delay);
1581 bms->sync_size = __cpu_to_le64(size);
1582 bms->write_behind = __cpu_to_le32(write_behind);
1583
1584 *chunkp = chunk;
1585 return 1;
1586 }
1587
1588
1589 static void locate_bitmap1(struct supertype *st, int fd)
1590 {
1591 unsigned long long offset;
1592 struct mdp_superblock_1 *sb;
1593 int mustfree = 0;
1594
1595 if (!st->sb) {
1596 if (st->ss->load_super(st, fd, NULL))
1597 return; /* no error I hope... */
1598 mustfree = 1;
1599 }
1600 sb = st->sb;
1601
1602 offset = __le64_to_cpu(sb->super_offset);
1603 offset += (int32_t) __le32_to_cpu(sb->bitmap_offset);
1604 if (mustfree)
1605 free(sb);
1606 lseek64(fd, offset<<9, 0);
1607 }
1608
1609 static int write_bitmap1(struct supertype *st, int fd)
1610 {
1611 struct mdp_superblock_1 *sb = st->sb;
1612 bitmap_super_t *bms = (bitmap_super_t*)(((char*)sb)+1024);
1613 int rv = 0;
1614
1615 int towrite, n;
1616 char *buf = (char*)(((long)(abuf+4096))&~4095UL);
1617
1618 locate_bitmap1(st, fd);
1619
1620 memset(buf, 0xff, 4096);
1621 memcpy(buf, ((char*)sb)+1024, sizeof(bitmap_super_t));
1622
1623 towrite = __le64_to_cpu(bms->sync_size) / (__le32_to_cpu(bms->chunksize)>>9);
1624 towrite = (towrite+7) >> 3; /* bits to bytes */
1625 towrite += sizeof(bitmap_super_t);
1626 towrite = ROUND_UP(towrite, 512);
1627 while (towrite > 0) {
1628 n = towrite;
1629 if (n > 4096)
1630 n = 4096;
1631 n = write(fd, buf, n);
1632 if (n > 0)
1633 towrite -= n;
1634 else
1635 break;
1636 memset(buf, 0xff, 4096);
1637 }
1638 fsync(fd);
1639 if (towrite)
1640 rv = -2;
1641
1642 return rv;
1643 }
1644
1645 static void free_super1(struct supertype *st)
1646 {
1647 if (st->sb)
1648 free(st->sb);
1649 st->sb = NULL;
1650 }
1651
1652 #ifndef MDASSEMBLE
1653 static int validate_geometry1(struct supertype *st, int level,
1654 int layout, int raiddisks,
1655 int chunk, unsigned long long size,
1656 char *subdev, unsigned long long *freesize,
1657 int verbose)
1658 {
1659 unsigned long long ldsize;
1660 int fd;
1661
1662 if (level == LEVEL_CONTAINER) {
1663 if (verbose)
1664 fprintf(stderr, Name ": 1.x metadata does not support containers\n");
1665 return 0;
1666 }
1667 if (!subdev)
1668 return 1;
1669
1670 fd = open(subdev, O_RDONLY|O_EXCL, 0);
1671 if (fd < 0) {
1672 if (verbose)
1673 fprintf(stderr, Name ": super1.x cannot open %s: %s\n",
1674 subdev, strerror(errno));
1675 return 0;
1676 }
1677
1678 if (!get_dev_size(fd, subdev, &ldsize)) {
1679 close(fd);
1680 return 0;
1681 }
1682 close(fd);
1683
1684 *freesize = avail_size1(st, ldsize >> 9);
1685 return 1;
1686 }
1687 #endif /* MDASSEMBLE */
1688
1689 struct superswitch super1 = {
1690 #ifndef MDASSEMBLE
1691 .examine_super = examine_super1,
1692 .brief_examine_super = brief_examine_super1,
1693 .export_examine_super = export_examine_super1,
1694 .detail_super = detail_super1,
1695 .brief_detail_super = brief_detail_super1,
1696 .export_detail_super = export_detail_super1,
1697 .write_init_super = write_init_super1,
1698 .validate_geometry = validate_geometry1,
1699 .add_to_super = add_to_super1,
1700 #endif
1701 .match_home = match_home1,
1702 .uuid_from_super = uuid_from_super1,
1703 .getinfo_super = getinfo_super1,
1704 .update_super = update_super1,
1705 .init_super = init_super1,
1706 .store_super = store_super1,
1707 .compare_super = compare_super1,
1708 .load_super = load_super1,
1709 .match_metadata_desc = match_metadata_desc1,
1710 .avail_size = avail_size1,
1711 .add_internal_bitmap = add_internal_bitmap1,
1712 .locate_bitmap = locate_bitmap1,
1713 .write_bitmap = write_bitmap1,
1714 .free_super = free_super1,
1715 #if __BYTE_ORDER == BIG_ENDIAN
1716 .swapuuid = 0,
1717 #else
1718 .swapuuid = 1,
1719 #endif
1720 .name = "1.x",
1721 };
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